/* roulang page: index */
/* ========== 设计变量 ========== */
:root{
  --bg-primary:#0B1220;
  --bg-secondary:#111C2E;
  --bg-elevated:rgba(15,24,40,.88);
  --bg-inset:rgba(10,18,32,.7);
  --bg-glass:rgba(18,29,51,.62);
  --brand-1:#1677FF;
  --brand-2:#00A9EE;
  --accent:#00D4FF;
  --highlight:#F5A524;
  --ok:#12B76A;
  --error:#F04438;
  --warn:#F79009;
  --text-1:#EAF0F8;
  --text-2:#A3B3CC;
  --text-3:#6B7E9E;
  --border-1:rgba(148,163,184,.12);
  --border-2:rgba(0,212,255,.18);
  --radius-lg:16px;
  --radius-md:10px;
  --radius-sm:4px;
  --radius-pill:999px;
  --shadow-card:0 18px 40px rgba(3,8,18,.45);
  --shadow-glow:0 8px 24px rgba(0,169,238,.32);
  --shadow-glow-lg:0 8px 32px rgba(0,169,238,.42);
  --transition:.2s ease;
  --container:1200px;
  --font-cn:"Source Han Sans SC","PingFang SC","Microsoft YaHei",sans-serif;
  --font-num:"JetBrains Mono","Roboto Mono",Consolas,monospace;
}
/* ========== Reset & Base ========== */
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  background:var(--bg-primary);
  color:var(--text-1);
  font-family:var(--font-cn);
  font-size:16px;
  line-height:1.7;
  letter-spacing:.04em;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
a{color:inherit;text-decoration:none;transition:color var(--transition)}
img{max-width:100%;display:block}
button{font-family:inherit;cursor:pointer;border:none;background:none;color:inherit}
input,select,textarea{font-family:inherit;font-size:16px}
ul,ol{list-style:none}
::selection{background:rgba(0,212,255,.25);color:#fff}
.container{max-width:var(--container);margin:0 auto;padding:0 24px}
.section{padding:96px 0}
.section--alt{background:var(--bg-secondary)}
@media(max-width:768px){ .section{padding:64px 0} .container{padding:0 16px} }
@media(max-width:520px){ .section{padding:48px 0} }

/* ========== 通用区块头 ========== */
.section-head{text-align:center;margin-bottom:56px}
.section-head__tag{display:inline-flex;align-items:center;gap:8px;background:rgba(0,212,255,.08);border:1px solid rgba(0,212,255,.18);color:var(--accent);font-size:13px;font-weight:500;padding:6px 18px;border-radius:var(--radius-pill);margin-bottom:16px}
.section-head__tag::before{content:"";display:inline-block;width:6px;height:6px;border-radius:50%;background:var(--accent);box-shadow:0 0 8px var(--accent)}
.section-head h2{font-size:28px;font-weight:800;line-height:1.3;letter-spacing:.03em;background:linear-gradient(135deg,#fff,var(--accent));-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent}
.section-head p{color:var(--text-2);font-size:15px;line-height:1.8;margin-top:12px;max-width:680px;margin-left:auto;margin-right:auto}
@media(max-width:520px){.section-head h2{font-size:24px}}

/* ========== 按钮 ========== */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:12px 28px;border-radius:var(--radius-md);font-size:16px;
  font-weight:600;line-height:1.4;transition:all var(--transition);
  border:1px solid transparent;text-align:center;white-space:nowrap;
}
.btn--primary{
  background:linear-gradient(135deg,var(--brand-1),var(--brand-2));
  color:#fff;box-shadow:var(--shadow-glow);border:none;
}
.btn--primary:hover{filter:brightness(1.1);box-shadow:var(--shadow-glow-lg);transform:translateY(-1px)}
.btn--primary:active{transform:translateY(1px);box-shadow:0 4px 12px rgba(0,169,238,.25)}
.btn--primary:focus-visible{outline:2px solid var(--accent);outline-offset:2px}
.btn--primary:disabled{opacity:.5;box-shadow:none;cursor:not-allowed}
.btn--ghost{
  background:transparent;border:1px solid rgba(234,240,248,.4);color:var(--text-1);
}
.btn--ghost:hover{background:rgba(255,255,255,.08);border-color:var(--accent)}
.btn--ghost:focus-visible{outline:2px solid var(--accent);outline-offset:2px}
.btn--ghost:active{transform:translateY(1px)}
.btn--sm{padding:8px 18px;font-size:14px}
.btn--block{width:100%}
.btn--highlight{
  background:linear-gradient(135deg,var(--highlight),#fcb424);color:#1a1a1a;
  box-shadow:0 8px 24px rgba(245,165,36,.32);border:none;
}
.btn--highlight:hover{filter:brightness(1.08);box-shadow:0 8px 32px rgba(245,165,36,.42)}
.btn--highlight:focus-visible{outline:2px solid var(--accent);outline-offset:2px}
.btn--text{background:none;border:none;color:var(--accent);padding:0;font-size:14px;font-weight:500;display:inline-flex;align-items:center;gap:4px}
.btn--text .arrow{transition:transform var(--transition)}
.btn--text:hover .arrow{transform:translateX(3px)}
.btn--text:hover{color:var(--accent)}
.btn--text:focus-visible{outline:2px solid var(--accent);outline-offset:2px;border-radius:4px}

/* ========== 徽章 / 标签 ========== */
.badge{
  display:inline-flex;align-items:center;padding:4px 12px;border-radius:var(--radius-pill);
  background:rgba(0,212,255,.12);color:var(--accent);font-size:12px;font-weight:500;
  line-height:1.5;letter-spacing:.02em;
}
.badge--highlight{background:rgba(245,165,36,.15);color:var(--highlight)}
.badge--neutral{background:rgba(148,163,184,.12);color:var(--text-2)}
.badge--hot{background:linear-gradient(135deg,var(--highlight),#fcb424);color:#1a1a1a;font-weight:700}

/* ========== 顶部导航 ========== */
.header{
  position:sticky;top:0;z-index:100;
  background:rgba(6,12,22,.88);
  backdrop-filter:blur(14px);
  -webkit-backdrop-filter:blur(14px);
  border-bottom:1px solid rgba(148,163,184,.15);
}
.header__top{display:flex;align-items:center;justify-content:space-between;height:64px;gap:16px}
.brand{display:flex;align-items:center;gap:12px;flex-shrink:0}
.brand__logo{
  width:40px;height:40px;border-radius:10px;
  background:linear-gradient(135deg,var(--brand-1),var(--brand-2));
  display:flex;align-items:center;justify-content:center;
  font-family:var(--font-num);font-weight:800;color:#fff;font-size:16px;
  box-shadow:0 4px 16px rgba(22,119,255,.4);letter-spacing:.02em;
}
.brand__text{display:flex;flex-direction:column;line-height:1.15}
.brand__text strong{font-size:18px;font-weight:800;color:#fff;letter-spacing:.05em}
.brand__text span{font-size:11px;color:var(--accent);letter-spacing:.18em}
.header__actions{display:flex;align-items:center;gap:12px}
.header__btn{
  display:inline-flex;align-items:center;gap:6px;padding:8px 16px;border-radius:var(--radius-pill);
  background:rgba(0,212,255,.08);border:1px solid rgba(0,212,255,.18);
  color:var(--text-1);font-size:13px;font-weight:500;transition:all var(--transition);
}
.header__btn:hover{background:rgba(0,212,255,.16);border-color:rgba(0,212,255,.4)}
.header__btn:focus-visible{outline:2px solid var(--accent);outline-offset:2px}
.header__btn .icon{color:var(--accent)}
.nav{
  display:flex;align-items:center;justify-content:space-between;
  height:48px;border-top:1px solid rgba(148,163,184,.08);
}
.nav__list{display:flex;align-items:center;gap:4px;overflow-x:auto;scrollbar-width:none}
.nav__list::-webkit-scrollbar{display:none}
.nav__link{
  display:inline-flex;align-items:center;padding:8px 16px;border-radius:var(--radius-pill);
  font-size:15px;font-weight:500;color:var(--text-2);
  transition:color var(--transition),background var(--transition);
  position:relative;white-space:nowrap;
}
.nav__link:hover{color:var(--accent);background:rgba(0,212,255,.08)}
.nav__link.is-active{color:var(--text-1)}
.nav__link.is-active::after{
  content:"";position:absolute;left:16px;right:16px;bottom:2px;height:2px;
  background:var(--accent);border-radius:2px;box-shadow:0 0 8px var(--accent);
}
.nav__cta{margin-left:16px;flex-shrink:0}
.btn--nav{
  padding:8px 22px;font-size:14px;border-radius:var(--radius-pill);
  background:linear-gradient(135deg,var(--brand-1),var(--brand-2));
  color:#fff;box-shadow:var(--shadow-glow);font-weight:600;
  transition:all var(--transition);border:none;
}
.btn--nav:hover{filter:brightness(1.1);box-shadow:var(--shadow-glow-lg)}
.btn--nav:focus-visible{outline:2px solid var(--accent);outline-offset:2px}
.btn--nav:active{transform:translateY(1px)}

/* 汉堡 */
.hamburger{display:none;width:40px;height:40px;border-radius:10px;align-items:center;justify-content:center;flex-direction:column;gap:5px;background:rgba(0,212,255,.08);border:1px solid rgba(0,212,255,.18)}
.hamburger span{display:block;width:18px;height:2px;background:var(--text-1);border-radius:2px;transition:all var(--transition)}
.hamburger.is-open span:nth-child(1){transform:translateY(7px) rotate(45deg)}
.hamburger.is-open span:nth-child(2){opacity:0}
.hamburger.is-open span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}
.hamburger:focus-visible{outline:2px solid var(--accent);outline-offset:2px}

/* 移动抽屉 */
.drawer{
  position:fixed;top:0;left:-280px;width:280px;height:100vh;z-index:200;
  background:rgba(6,12,22,.97);backdrop-filter:blur(20px);-webkit-backdrop-filter:blur(20px);
  border-right:1px solid rgba(148,163,184,.12);
  padding:24px;display:flex;flex-direction:column;gap:8px;
  transition:left .3s ease;box-shadow:40px 0 80px rgba(0,0,0,.4);
}
.drawer.is-open{left:0}
.drawer__brand{display:flex;align-items:center;gap:12px;padding-bottom:20px;border-bottom:1px solid rgba(148,163,184,.12);margin-bottom:12px}
.drawer__brand .brand__logo{width:36px;height:36px;font-size:14px}
.drawer__brand strong{font-size:16px;color:#fff}
.drawer__brand span{font-size:11px;color:var(--accent);display:block}
.drawer__link{
  display:flex;align-items:center;padding:12px 16px;border-radius:var(--radius-md);
  font-size:15px;color:var(--text-2);transition:all var(--transition);
}
.drawer__link:hover{background:rgba(0,212,255,.08);color:var(--accent)}
.drawer__link.is-active{background:linear-gradient(135deg,rgba(22,119,255,.15),rgba(0,169,238,.15));color:var(--accent);font-weight:600}
.drawer__close{
  position:absolute;top:16px;right:16px;width:36px;height:36px;border-radius:50%;
  display:flex;align-items:center;justify-content:center;color:var(--text-2);
  background:rgba(255,255,255,.06);transition:all var(--transition);font-size:18px;
}
.drawer__close:hover{background:rgba(255,255,255,.12);color:#fff}
.drawer__close:focus-visible{outline:2px solid var(--accent);outline-offset:2px}
.drawer-overlay{
  position:fixed;inset:0;z-index:190;background:rgba(0,0,0,.6);
  opacity:0;visibility:hidden;transition:opacity .3s ease;
}
.drawer-overlay.is-visible{opacity:1;visibility:visible}

@media(max-width:1024px){
  .nav__link{padding:8px 12px;font-size:14px}
  .btn--nav{padding:8px 16px}
}
@media(max-width:768px){
  .header__actions .header__btn{display:none}
  .hamburger{display:flex}
  .nav{height:auto;border-top:none}
  .nav__list{display:none}
  .nav__cta{border-top:1px solid rgba(148,163,184,.08);padding:12px 0 0;margin:0}
}
@media(min-width:769px){
  .drawer,.drawer-overlay{display:none}
}

/* ========== Hero ========== */
.hero{
  position:relative;min-height:70vh;display:flex;align-items:center;
  padding:88px 0;
  background:
    radial-gradient(circle at 15% 30%,rgba(0,212,255,.18),transparent 42%),
    radial-gradient(circle at 85% 70%,rgba(22,119,255,.35),transparent 55%),
    linear-gradient(rgba(11,18,32,.72),rgba(11,18,32,.82)),
    url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
}
.hero::before{
  content:"";position:absolute;inset:0;pointer-events:none;
  background-image:
    linear-gradient(rgba(0,212,255,.04) 1px,transparent 1px),
    linear-gradient(90deg,rgba(0,212,255,.04) 1px,transparent 1px);
  background-size:48px 48px;
  -webkit-mask-image:radial-gradient(circle at 50% 50%,#000,transparent 85%);
  mask-image:radial-gradient(circle at 50% 50%,#000,transparent 85%);
}
.hero__grid{display:grid;grid-template-columns:1.1fr .9fr;gap:64px;align-items:center;position:relative;z-index:2}
.hero__content{max-width:620px}
.hero__eyebrow{
  display:inline-flex;align-items:center;gap:8px;
  padding:6px 18px;border-radius:var(--radius-pill);
  background:rgba(0,212,255,.1);border:1px solid rgba(0,212,255,.22);
  color:var(--accent);font-size:13px;font-weight:500;margin-bottom:24px;
}
.hero__title{
  font-size:clamp(32px,5vw,48px);font-weight:800;line-height:1.22;letter-spacing:.03em;
  color:#fff;margin-bottom:20px;
}
.hero__title-accent{
  display:block;margin-top:8px;font-size:clamp(16px,2vw,20px);font-weight:600;
  color:var(--accent);letter-spacing:.06em;
}
.hero__desc{
  font-size:16px;line-height:1.8;color:var(--text-2);margin-bottom:36px;max-width:520px;
}
.hero__ctas{display:flex;gap:16px;flex-wrap:wrap}
.hero__note{display:flex;align-items:center;gap:8px;margin-top:24px;font-size:13px;color:var(--text-3)}
.hero__note i{color:var(--ok)}

/* Hero 玻璃浮层 */
.hero__card{
  background:var(--bg-glass);backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);
  border:1px solid var(--border-2);border-radius:var(--radius-lg);
  padding:16px;box-shadow:var(--shadow-card);
  position:relative;
}
.hero__card:hover{border-color:rgba(0,212,255,.5)}
.hero__card-media{border-radius:12px;overflow:hidden;margin-bottom:16px}
.hero__card-media img{width:100%;aspect-ratio:4/3;object-fit:cover;transition:transform .5s ease}
.hero__card:hover .hero__card-media img{transform:scale(1.03)}
.hero__card-stats{display:grid;grid-template-columns:1fr 1fr;gap:12px}
.hero__stat{
  background:rgba(10,18,32,.55);border-radius:var(--radius-md);
  border:1px solid rgba(148,163,184,.1);padding:16px;text-align:center;
}
.hero__stat-num{font-family:var(--font-num);font-size:26px;font-weight:800;color:var(--accent);line-height:1.2}
.hero__stat-label{font-size:12px;color:var(--text-3);margin-top:4px}
.hero__card-caption{position:absolute;top:24px;left:24px;z-index:2}
.hero__card-badge{
  display:inline-flex;padding:6px 14px;border-radius:var(--radius-pill);
  background:rgba(11,18,32,.75);backdrop-filter:blur(6px);-webkit-backdrop-filter:blur(6px);
  border:1px solid rgba(245,165,36,.35);color:var(--highlight);font-size:12px;font-weight:600;
}
@media(max-width:1024px){
  .hero__grid{gap:40px}
}
@media(max-width:768px){
  .hero{padding:64px 0;min-height:auto}
  .hero__grid{grid-template-columns:1fr;gap:40px}
  .hero__card{max-width:520px;margin:0 auto}
  .hero__ctas .btn{flex:1;justify-content:center}
}

/* ========== 优惠阶梯 ========== */
.steps-grid{display:grid;grid-template-columns:repeat(3,1fr);align-items:start;gap:24px}
.step-card{
  background:var(--bg-glass);backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);
  border:1px solid var(--border-2);border-radius:var(--radius-lg);
  padding:36px 28px 28px;position:relative;
  transition:border-color var(--transition),box-shadow var(--transition),transform var(--transition);
  box-shadow:var(--shadow-card);
}
.step-card:hover{border-color:rgba(0,212,255,.5);transform:translateY(-4px)}
.step-card--featured{
  transform:translateY(-24px) scale(1.05);
  border-color:rgba(0,212,255,.5);
  box-shadow:0 24px 60px rgba(0,169,238,.18),var(--shadow-card);
}
.step-card--featured:hover{transform:translateY(-28px) scale(1.05)}
.step-card__tag{
  display:inline-flex;padding:5px 16px;border-radius:var(--radius-pill);
  background:rgba(148,163,184,.12);color:var(--text-2);font-size:13px;font-weight:600;
  margin-bottom:16px;
}
.step-card--featured .step-card__tag{background:rgba(245,165,36,.15);color:var(--highlight)}
.step-card__corner{
  position:absolute;top:-10px;right:20px;padding:4px 14px;border-radius:var(--radius-pill);
  background:linear-gradient(135deg,var(--highlight),#fcb424);color:#1a1a1a;
  font-size:12px;font-weight:800;box-shadow:0 4px 14px rgba(245,165,36,.45);
}
.step-card h3{font-size:22px;font-weight:800;color:#fff;margin-bottom:8px}
.step-card__desc{font-size:14px;color:var(--text-3);margin-bottom:20px;line-height:1.7}
.step-card__list{display:flex;flex-direction:column;gap:12px;margin-bottom:24px}
.step-card__list li{
  display:flex;align-items:flex-start;gap:10px;font-size:14px;color:var(--text-2);line-height:1.6;
}
.step-card__list li::before{
  content:"✓";flex-shrink:0;display:flex;align-items:center;justify-content:center;
  width:18px;height:18px;border-radius:50%;background:rgba(0,212,255,.12);
  color:var(--accent);font-size:11px;font-weight:700;margin-top:2px;
}
.step-card__footer{display:flex;align-items:center;justify-content:space-between}
@media(max-width:1024px){
  .steps-grid{grid-template-columns:1fr 1fr}
  .step-card--featured{transform:scale(1.02)}
  .step-card--featured:hover{transform:scale(1.02) translateY(-4px)}
}
@media(max-width:768px){
  .steps-grid{grid-template-columns:1fr}
  .step-card--featured{transform:none}
  .step-card--featured:hover{transform:translateY(-4px)}
}

/* ========== 套餐对比 ========== */
.compare-wrap{
  background:var(--bg-elevated);border:1px solid var(--border-1);
  border-radius:var(--radius-lg);overflow-x:auto;box-shadow:var(--shadow-card);
}
.compare-table{width:100%;min-width:780px;border-collapse:separate;border-spacing:0}
.compare-table th,.compare-table td{padding:20px 24px;text-align:center;border-bottom:1px solid rgba(148,163,184,.08);font-size:15px}
.compare-table thead th{
  background:rgba(10,18,32,.6);font-weight:700;color:var(--text-1);font-size:16px;
  border-bottom:2px solid rgba(0,212,255,.15);
}
.compare-table thead th:first-child{text-align:left;font-size:14px;color:var(--text-3)}
.compare-table tbody th{text-align:left;font-size:14px;color:var(--text-2);font-weight:500;background:rgba(10,18,32,.3)}
.compare-table td{color:var(--text-2)}
.compare-table tr:last-child td{border-bottom:none}
.compare-table .col-recommend{background:rgba(0,212,255,.04);box-shadow:inset 0 0 0 1px var(--accent);position:relative}
.compare-table .col-recommend td{color:var(--text-1)}
.compare-table .recommend-tag{
  position:absolute;top:-10px;left:50%;transform:translateX(-50%);
  background:linear-gradient(135deg,var(--highlight),#fcb424);color:#1a1a1a;
  font-size:12px;font-weight:800;padding:4px 14px;border-radius:var(--radius-pill);
  white-space:nowrap;box-shadow:0 4px 12px rgba(245,165,36,.35);z-index:2;
}
.compare-table .check{color:var(--accent);font-weight:700;font-size:16px}
.compare-table .minus{color:var(--text-3);font-size:15px}
.compare-actions{display:flex;justify-content:center;padding:24px;gap:12px}
.compare-note{text-align:center;font-size:13px;color:var(--text-3);padding-bottom:24px}
@media(max-width:768px){
  .compare-wrap{border-radius:var(--radius-md)}
  .compare-table thead th{position:sticky;top:0}
}

/* ========== 限时入口 ========== */
.limited{
  position:relative;
  background:
    radial-gradient(circle at 50% 20%,rgba(245,165,36,.14),transparent 60%),
    radial-gradient(circle at 10% 80%,rgba(22,119,255,.12),transparent 40%),
    var(--bg-secondary);
}
.limited__inner{
  background:var(--bg-glass);backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);
  border:1px solid rgba(245,165,36,.25);border-radius:24px;
  padding:48px;display:grid;grid-template-columns:1fr auto;align-items:center;gap:48px;
  box-shadow:0 24px 60px rgba(0,0,0,.35);
}
.limited__title{font-size:28px;font-weight:800;color:#fff;line-height:1.3}
.limited__title span{color:var(--highlight)}
.limited__desc{color:var(--text-2);font-size:15px;margin-top:12px;line-height:1.8;max-width:480px}
.countdown{display:flex;align-items:center;gap:12px;margin-top:24px}
.countdown__item{
  display:flex;flex-direction:column;align-items:center;gap:4px;
  background:rgba(10,18,32,.7);border:1px solid rgba(245,165,36,.2);
  border-radius:var(--radius-md);padding:12px 8px;min-width:68px;
}
.countdown__num{
  font-family:var(--font-num);font-size:32px;font-weight:800;color:var(--highlight);
  line-height:1;font-variant-numeric:tabular-nums;
}
.countdown__label{font-size:11px;color:var(--text-3);letter-spacing:.1em}
.countdown__sep{font-family:var(--font-num);font-size:28px;font-weight:700;color:var(--text-3)}
.limited__cta{display:flex;flex-direction:column;align-items:center;gap:16px}
.limited__cta .btn{white-space:nowrap}
@media(max-width:1024px){
  .limited__inner{grid-template-columns:1fr;gap:32px;padding:32px}
  .limited__cta{align-items:flex-start}
}
@media(max-width:520px){
  .limited__inner{padding:24px 20px}
  .countdown{flex-wrap:wrap}
  .countdown__sep{display:none}
}

/* ========== 资讯列表 ========== */
.news-list{display:flex;flex-direction:column;gap:24px}
.news-card{
  display:grid;grid-template-columns:280px 1fr;gap:24px;align-items:center;
  background:var(--bg-elevated);border:1px solid var(--border-1);border-radius:var(--radius-lg);
  padding:20px;transition:all var(--transition);
}
.news-card:hover{border-color:rgba(0,212,255,.4);box-shadow:var(--shadow-card);transform:translateY(-2px)}
.news-card__media{border-radius:12px;overflow:hidden}
.news-card__media img{width:100%;aspect-ratio:4/3;object-fit:cover;transition:transform .45s ease}
.news-card:hover .news-card__media img{transform:scale(1.04)}
.news-card__body{display:flex;flex-direction:column;gap:8px;min-width:0}
.news-card__meta{display:flex;align-items:center;gap:16px;font-size:13px;color:var(--text-3);margin-top:4px}
.news-card__meta time{display:inline-flex;align-items:center;gap:6px}
.news-card__meta time::before{content:"";display:inline-block;width:4px;height:4px;border-radius:50%;background:var(--accent);opacity:.6}
.news-card__link{display:inline-flex;align-items:center;gap:4px;font-size:14px;color:var(--accent);font-weight:500}
.news-card__link .arrow{transition:transform var(--transition)}
.news-card__link:hover .arrow{transform:translateX(3px)}
.news-empty{
  display:flex;flex-direction:column;align-items:center;justify-content:center;
  padding:72px 24px;text-align:center;gap:16px;
  background:var(--bg-glass);backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);
  border:1px solid var(--border-2);border-radius:var(--radius-lg);
}
.news-empty__icon{
  width:64px;height:64px;border-radius:50%;display:flex;align-items:center;justify-content:center;
  background:rgba(0,212,255,.08);color:var(--accent);font-size:28px;
  animation:pulse 2s infinite;
}
@keyframes pulse{0%,100%{box-shadow:0 0 0 0 rgba(0,212,255,.2)}50%{box-shadow:0 0 0 12px rgba(0,212,255,0)}}
.news-empty p{color:var(--text-2);font-size:15px}
@media(max-width:768px){
  .news-card{grid-template-columns:1fr;padding:16px}
  .news-card__media img{aspect-ratio:16/9}
}

/* ========== 咨询表单 ========== */
.contact-grid{display:grid;grid-template-columns:1fr 1.1fr;gap:48px;align-items:stretch}
.contact-guide{
  background:var(--bg-glass);backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);
  border:1px solid var(--border-2);border-radius:var(--radius-lg);
  padding:40px;display:flex;flex-direction:column;justify-content:space-between;gap:32px;
  position:relative;overflow:hidden;
}
.contact-guide::before{
  content:"";position:absolute;top:-80px;right:-80px;width:220px;height:220px;border-radius:50%;
  background:radial-gradient(circle,rgba(0,169,238,.18),transparent 70%);pointer-events:none;
}
.contact-guide h3{font-size:24px;font-weight:800;color:#fff;margin-bottom:14px}
.contact-guide p{color:var(--text-2);font-size:15px;line-height:1.8;margin-bottom:20px}
.contact-guide__list{display:flex;flex-direction:column;gap:14px}
.contact-guide__list li{display:flex;align-items:center;gap:12px;font-size:15px;color:var(--text-1)}
.contact-guide__list li .icon{
  width:32px;height:32px;border-radius:8px;flex-shrink:0;
  background:rgba(0,212,255,.1);border:1px solid rgba(0,212,255,.2);
  display:flex;align-items:center;justify-content:center;color:var(--accent);font-size:14px;
}
.contact-guide__note{margin-top:auto;font-size:13px;color:var(--text-3);line-height:1.7}
.contact-form{
  background:var(--bg-elevated);border:1px solid var(--border-1);border-radius:var(--radius-lg);
  padding:40px;box-shadow:var(--shadow-card);
}
.contact-form h3{font-size:22px;font-weight:800;color:#fff;margin-bottom:24px}
.form-grid{display:grid;grid-template-columns:1fr 1fr;gap:20px}
.form-group{display:flex;flex-direction:column;gap:8px;margin-bottom:20px}
.form-group--full{grid-column:1/-1}
.form-group label{font-size:14px;color:var(--text-2);font-weight:500}
.form-group label .required{color:var(--error);margin-left:2px}
.form-group input,.form-group select,.form-group textarea{
  background:var(--bg-inset);border:1px solid rgba(148,163,184,.25);
  border-radius:var(--radius-md);padding:12px 14px;color:var(--text-1);
  font-size:15px;width:100%;transition:all var(--transition);outline:none;
  -webkit-appearance:none;appearance:none;
}
.form-group input::placeholder,.form-group textarea::placeholder{color:rgba(107,126,158,.6)}
.form-group input:focus,.form-group select:focus,.form-group textarea:focus{
  border-color:var(--accent);box-shadow:0 0 0 3px rgba(0,212,255,.15),0 0 12px rgba(0,212,255,.1);
}
.form-group input:focus-visible,.form-group select:focus-visible,.form-group textarea:focus-visible{
  outline:2px solid var(--accent);outline-offset:2px;
}
.form-group select{
  background-image:url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath d='M1 1l5 5 5-5' stroke='%236B7E9E' stroke-width='2' fill='none' stroke-linecap='round'/%3E%3C/svg%3E");
  background-repeat:no-repeat;background-position:right 16px center;padding-right:40px;
}
.form-group textarea{resize:vertical;min-height:110px}
.form-error{font-size:12px;color:var(--error);display:none}
.form-group.is-error input,.form-group.is-error select,.form-group.is-error textarea{border-color:var(--error);box-shadow:0 0 0 3px rgba(240,68,56,.12)}
.form-group.is-error .form-error{display:block}
.form-tip{font-size:12px;color:var(--text-3);margin-top:12px;text-align:center}
.form-success{
  display:none;text-align:center;padding:48px 24px;
}
.form-success.is-show{display:block}
.form-success .icon{
  width:64px;height:64px;margin:0 auto 20px;border-radius:50%;
  background:rgba(18,183,106,.12);border:1px solid rgba(18,183,106,.3);
  color:var(--ok);font-size:28px;display:flex;align-items:center;justify-content:center;
}
.form-success h4{font-size:20px;color:#fff;margin-bottom:8px}
.form-success p{color:var(--text-2);font-size:14px}
@media(max-width:1024px){
  .contact-grid{grid-template-columns:1fr}
}
@media(max-width:520px){
  .form-grid{grid-template-columns:1fr}
  .contact-form,.contact-guide{padding:24px 20px}
  .form-group--full{grid-column:auto}
}

/* ========== FAQ 手风琴 ========== */
.faq-wrap{max-width:860px;margin:0 auto}
.faq-item{
  background:var(--bg-elevated);border:1px solid var(--border-1);border-radius:var(--radius-lg);
  margin-bottom:16px;transition:all var(--transition);overflow:hidden;
}
.faq-item:hover{border-color:rgba(0,212,255,.3)}
.faq-item.is-active{border-color:rgba(0,212,255,.45);box-shadow:0 0 24px rgba(0,212,255,.06)}
.faq-item__title{
  width:100%;display:flex;align-items:center;justify-content:space-between;gap:16px;
  padding:20px 24px;font-size:16px;font-weight:600;color:var(--text-1);
  text-align:left;transition:color var(--transition);
  min-height:56px;
}
.faq-item__title:hover{color:var(--accent)}
.faq-item__title:focus-visible{outline:2px solid var(--accent);outline-offset:2px;border-radius:var(--radius-lg)}
.faq-item__icon{
  flex-shrink:0;width:22px;height:22px;display:flex;align-items:center;justify-content:center;
  font-size:16px;color:var(--text-2);transition:transform .25s ease,color var(--transition);
  background:rgba(0,212,255,.08);border-radius:50%;
}
.faq-item.is-active .faq-item__icon{transform:rotate(45deg);color:var(--accent)}
.faq-item__body{max-height:0;overflow:hidden;transition:max-height .3s ease}
.faq-item__inner{padding:4px 24px 24px;font-size:15px;color:var(--text-2);line-height:1.8;background:rgba(255,255,255,.02)}
@media(max-width:520px){
  .faq-item__title{padding:16px 18px}
  .faq-item__inner{padding:0 18px 18px}
}

/* ========== CTA 横幅 ========== */
.cta-band{
  position:relative;overflow:hidden;
  background:
    radial-gradient(circle at 80% 50%,rgba(22,119,255,.25),transparent 55%),
    var(--bg-secondary);
  border-top:1px solid rgba(148,163,184,.1);border-bottom:1px solid rgba(148,163,184,.1);
}
.cta-band__inner{
  display:flex;align-items:center;justify-content:space-between;gap:32px;padding:48px 0;flex-wrap:wrap;
}
.cta-band h3{font-size:24px;font-weight:800;color:#fff;margin-bottom:6px}
.cta-band p{color:var(--text-2);font-size:15px}
.cta-band .btn-group{display:flex;gap:16px;flex-wrap:wrap}

/* ========== 页脚 ========== */
.footer{
  background:rgba(4,8,15,.92);border-top:1px solid rgba(148,163,184,.1);
  padding:64px 24px 24px;
}
.footer__brand{display:flex;align-items:center;gap:12px;margin-bottom:8px}
.footer__brand .brand__logo{width:36px;height:36px;font-size:14px}
.footer__brand strong{font-size:17px;color:#fff;letter-spacing:.05em}
.footer__brand span{font-size:11px;color:var(--accent);display:block;letter-spacing:.14em}
.footer__desc{font-size:13px;color:var(--text-3);line-height:1.7;max-width:420px;margin-bottom:32px}
.footer__grid{
  display:grid;grid-template-columns:repeat(4,1fr);gap:32px;margin-bottom:40px;
}
.footer__col h4{font-size:14px;font-weight:700;color:var(--text-1);margin-bottom:16px;letter-spacing:.05em}
.footer__col ul{display:flex;flex-direction:column;gap:10px}
.footer__col a{font-size:14px;color:var(--text-2);transition:color var(--transition)}
.footer__col a:hover{color:var(--accent)}
.footer__col a:focus-visible{outline:2px solid var(--accent);outline-offset:2px;border-radius:4px}
.footer__bottom{
  border-top:1px solid rgba(148,163,184,.08);padding-top:24px;
  display:flex;flex-direction:column;align-items:center;gap:8px;
  font-size:13px;color:var(--text-3);text-align:center;
}
.footer__bottom a{color:var(--text-3)}
.footer__bottom a:hover{color:var(--accent)}
@media(max-width:1024px){
  .footer__grid{grid-template-columns:repeat(2,1fr)}
}
@media(max-width:520px){
  .footer__grid{grid-template-columns:1fr}
  .footer{padding:48px 16px 24px}
}

/* ========== 动画 ========== */
@keyframes fadeUp{from{opacity:0;transform:translateY(24px)}to{opacity:1;transform:translateY(0)}}
.animate-fade{animation:fadeUp .7s ease both}
.delay-1{animation-delay:.1s}.delay-2{animation-delay:.2s}.delay-3{animation-delay:.3s}
@media(prefers-reduced-motion:reduce){
  *,*::before,*::after{animation:none!important;transition:none!important}
}

/* roulang page: category1 */
:root {
  --bg-primary: #0B1220;
  --bg-secondary: #111C2E;
  --bg-card: rgba(15, 24, 40, .88);
  --bg-glass: rgba(18, 29, 51, .62);
  --brand-start: #1677FF;
  --brand-end: #00A9EE;
  --accent: #00D4FF;
  --accent-glow: rgba(0, 212, 255, .2);
  --warning: #F5A524;
  --success: #12B76A;
  --error: #F04438;
  --text-primary: #EAF0F8;
  --text-secondary: #A3B3CC;
  --text-muted: #6B7E9E;
  --border: rgba(148, 163, 184, .15);
  --border-accent: rgba(0, 212, 255, .18);
  --radius-lg: 16px;
  --radius-md: 10px;
  --radius-pill: 999px;
  --shadow-card: 0 18px 40px rgba(3, 8, 18, .45);
  --shadow-btn: 0 8px 24px rgba(0, 169, 238, .32);
  --transition: .2s ease;
}
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: "Source Han Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.7;
  font-size: 16px;
  letter-spacing: .04em;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; transition: color var(--transition), background var(--transition), border-color var(--transition), box-shadow var(--transition); }
button { font-family: inherit; }
ul, ol { list-style: none; }
.container { max-width: 1200px; margin: 0 auto; padding-left: 24px; padding-right: 24px; }
section { padding: 72px 0; }

/* Header */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(6, 12, 22, .88);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--border);
}
.header__top { display: flex; align-items: center; justify-content: space-between; height: 64px; }
.brand { display: flex; align-items: center; gap: 10px; }
.brand__logo {
  width: 40px; height: 40px; border-radius: 10px;
  background: linear-gradient(135deg, var(--brand-start), var(--brand-end));
  display: flex; align-items: center; justify-content: center;
  font-weight: 800; font-size: 15px; color: #fff;
  box-shadow: var(--shadow-btn);
}
.brand__text { display: flex; flex-direction: column; line-height: 1.2; }
.brand__text strong { font-size: 17px; font-weight: 700; letter-spacing: .05em; }
.brand__text span { font-size: 13px; color: var(--text-secondary); }
.header__tools { display: flex; gap: 12px; }
.header__tool {
  font-size: 13px; padding: 7px 18px; border-radius: var(--radius-pill);
  border: 1px solid rgba(234, 240, 248, .35); color: var(--text-primary);
  background: rgba(18, 29, 51, .45);
}
.header__tool:hover { border-color: var(--accent); color: var(--accent); background: rgba(0, 212, 255, .08); }

.nav { border-top: 1px solid rgba(148, 163, 184, .08); }
.nav__container { display: flex; align-items: center; justify-content: space-between; min-height: 48px; gap: 16px; }
.nav__list { display: flex; align-items: center; gap: 4px; flex-wrap: wrap; }
.nav__link {
  display: inline-block; font-size: 15px; font-weight: 500;
  padding: 8px 16px; border-radius: var(--radius-pill);
  color: var(--text-secondary); position: relative;
}
.nav__link:hover { color: var(--accent); background: rgba(0, 212, 255, .08); }
.nav__link.is-active { color: var(--accent); }
.nav__link.is-active::after {
  content: ''; position: absolute; left: 20px; right: 20px; bottom: 2px; height: 2px;
  background: var(--accent); border-radius: 2px; box-shadow: 0 0 8px rgba(0, 212, 255, .7);
}
.btn--nav {
  display: inline-block; padding: 8px 22px; border-radius: var(--radius-pill);
  background: linear-gradient(135deg, var(--brand-start), var(--brand-end));
  color: #fff; font-size: 14px; font-weight: 600; white-space: nowrap;
  box-shadow: var(--shadow-btn); transition: transform var(--transition), box-shadow var(--transition), filter var(--transition);
}
.btn--nav:hover { filter: brightness(1.1); box-shadow: 0 10px 30px rgba(0, 169, 238, .42); }
.btn--nav:active { transform: translateY(1px); }

/* Buttons */
.btn { display: inline-block; padding: 12px 28px; border-radius: var(--radius-md); font-size: 16px; font-weight: 600; text-align: center; border: none; cursor: pointer; transition: transform var(--transition), box-shadow var(--transition), background var(--transition), border-color var(--transition); }
.btn--primary {
  background: linear-gradient(135deg, var(--brand-start), var(--brand-end));
  color: #fff; box-shadow: var(--shadow-btn);
}
.btn--primary:hover { filter: brightness(1.1); box-shadow: 0 10px 32px rgba(0, 169, 238, .42); transform: translateY(-1px); }
.btn--primary:active { transform: translateY(1px); }
.btn--primary:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }
.btn--ghost {
  background: transparent; border: 1px solid rgba(234, 240, 248, .4); color: var(--text-primary);
}
.btn--ghost:hover { background: rgba(255, 255, 255, .08); border-color: var(--accent); color: var(--accent); }
.btn--ghost:active { transform: translateY(1px); }
.btn--ghost:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

/* Badge */
.badge {
  display: inline-block; padding: 4px 14px; border-radius: var(--radius-pill);
  background: rgba(0, 212, 255, .12); color: var(--accent); font-size: 12px; font-weight: 600; letter-spacing: .06em;
}

/* Page Hero */
.page-hero {
  position: relative; padding: 76px 0 68px; overflow: hidden;
  background: url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
}
.page-hero::before {
  content: ''; position: absolute; inset: 0;
  background: linear-gradient(105deg, rgba(11, 18, 32, .94) 20%, rgba(11, 18, 32, .72) 60%, rgba(11, 18, 32, .55));
}
.page-hero::after {
  content: ''; position: absolute; top: -160px; right: -120px; width: 480px; height: 480px;
  background: radial-gradient(circle, rgba(22, 119, 255, .35), transparent 65%);
  pointer-events: none;
}
.page-hero__inner { position: relative; z-index: 2; }
.page-hero .badge { margin-bottom: 18px; }
.page-hero h1 {
  font-size: clamp(32px, 5vw, 48px); font-weight: 800; line-height: 1.25;
  letter-spacing: .03em; margin: 12px 0 16px;
}
.page-hero h1 span { color: var(--accent); }
.page-hero__sub { font-size: 18px; color: var(--text-secondary); max-width: 640px; margin-bottom: 30px; line-height: 1.75; }
.page-hero__actions { display: flex; gap: 16px; flex-wrap: wrap; }

/* Feature overview */
.feature-overview { background: var(--bg-secondary); padding: 72px 0; }
.section-head { text-align: center; max-width: 720px; margin: 0 auto 48px; }
.section-head h2 { font-size: 28px; font-weight: 800; letter-spacing: .03em; margin-bottom: 12px; }
.section-head p { color: var(--text-secondary); font-size: 15px; }
.overview-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }
.overview-card {
  background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius-lg);
  padding: 32px 28px; box-shadow: var(--shadow-card); transition: border-color var(--transition), transform var(--transition);
}
.overview-card:hover { border-color: rgba(0, 212, 255, .4); transform: translateY(-4px); }
.overview-card__icon {
  width: 48px; height: 48px; border-radius: 12px; margin-bottom: 18px;
  background: linear-gradient(135deg, rgba(22, 119, 255, .25), rgba(0, 169, 238, .25));
  display: flex; align-items: center; justify-content: center; font-size: 20px;
  border: 1px solid var(--border-accent);
}
.overview-card h3 { font-size: 20px; font-weight: 700; margin-bottom: 10px; }
.overview-card p { color: var(--text-secondary); font-size: 14px; line-height: 1.75; }

/* Platform features main */
.platform-section { padding: 72px 0; background: var(--bg-primary); }
.platform-layout { display: grid; grid-template-columns: 260px 1fr; gap: 48px; align-items: start; }
.sidebar-nav {
  position: sticky; top: 140px; background: var(--bg-card);
  border-radius: var(--radius-lg); border: 1px solid var(--border);
  padding: 24px 18px; box-shadow: var(--shadow-card);
}
.sidebar-nav__title { font-size: 14px; color: var(--text-muted); letter-spacing: .08em; padding: 0 14px 12px; border-bottom: 1px solid var(--border); margin-bottom: 12px; }
.sidebar-nav__link {
  display: block; padding: 10px 14px; border-radius: var(--radius-md);
  font-size: 14px; color: var(--text-secondary); margin-bottom: 2px;
}
.sidebar-nav__link:hover { background: rgba(0, 212, 255, .08); color: var(--accent); }
.sidebar-nav__link.is-active { background: linear-gradient(135deg, rgba(22, 119, 255, .3), rgba(0, 169, 238, .3)); color: #fff; font-weight: 600; }

/* Timeline */
.timeline { position: relative; }
.timeline__item { position: relative; padding: 0 0 48px 56px; }
.timeline__item:last-child { padding-bottom: 0; }
.timeline__item::before {
  content: ''; position: absolute; left: 20px; top: 44px; bottom: 0; width: 2px;
  background: repeating-linear-gradient(to bottom, var(--accent) 0 6px, transparent 6px 12px);
  opacity: .5;
}
.timeline__item:last-child::before { display: none; }
.timeline__dot {
  position: absolute; left: 0; top: 8px; width: 42px; height: 42px;
  border-radius: 50%; background: var(--bg-secondary);
  border: 2px solid var(--accent);
  box-shadow: 0 0 0 6px rgba(0, 212, 255, .12), 0 0 20px rgba(0, 212, 255, .4);
  display: flex; align-items: center; justify-content: center;
  font-weight: 800; font-size: 15px; color: var(--accent); z-index: 2;
}
.timeline-card {
  background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius-lg);
  padding: 28px; box-shadow: var(--shadow-card);
  display: grid; grid-template-columns: 1fr 220px; gap: 24px; align-items: center;
  transition: border-color var(--transition);
}
.timeline-card:hover { border-color: rgba(0, 212, 255, .4); }
.timeline-card__content h3 { font-size: 20px; font-weight: 700; margin-bottom: 8px; }
.timeline-card__content .tag { display: inline-block; font-size: 12px; color: var(--text-muted); background: rgba(148, 163, 184, .12); padding: 3px 10px; border-radius: var(--radius-pill); margin-bottom: 10px; }
.timeline-card__content p { color: var(--text-secondary); font-size: 14px; line-height: 1.8; }
.timeline-card__media { border-radius: 12px; overflow: hidden; border: 1px solid var(--border); background: var(--bg-secondary); }
.timeline-card__media img { width: 100%; height: 140px; object-fit: cover; }

/* Quick guide */
.quick-guide { background: var(--bg-secondary); padding: 72px 0; }
.guide-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 24px; }
.guide-card { background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius-lg); padding: 26px 22px; box-shadow: var(--shadow-card); transition: transform var(--transition), border-color var(--transition); }
.guide-card:hover { transform: translateY(-4px); border-color: rgba(0, 212, 255, .4); }
.guide-card__num { font-family: "JetBrains Mono", "Roboto Mono", monospace; font-size: 26px; font-weight: 800; color: var(--accent); opacity: .8; margin-bottom: 10px; }
.guide-card h3 { font-size: 17px; font-weight: 700; margin-bottom: 8px; }
.guide-card p { font-size: 13px; color: var(--text-secondary); line-height: 1.7; }

/* FAQ */
.faq { padding: 72px 0; background: var(--bg-primary); }
.faq__list { max-width: 860px; margin: 0 auto; }
.faq-item {
  background: var(--bg-card); border: 1px solid var(--border); border-radius: var(--radius-lg);
  margin-bottom: 14px; overflow: hidden; transition: border-color var(--transition);
}
.faq-item:hover { border-color: rgba(0, 212, 255, .35); }
.faq-item summary {
  display: flex; align-items: center; justify-content: space-between;
  padding: 18px 24px; cursor: pointer; font-size: 16px; font-weight: 600; color: var(--text-primary);
  list-style: none;
}
.faq-item summary::-webkit-details-marker { display: none; }
.faq-item summary::after {
  content: '+'; font-size: 24px; color: var(--accent); transition: transform var(--transition); line-height: 1;
}
.faq-item[open] summary::after { transform: rotate(45deg); }
.faq-item[open] summary { color: var(--accent); }
.faq-item__body { padding: 0 24px 18px; font-size: 14px; color: var(--text-secondary); line-height: 1.8; background: rgba(255, 255, 255, .02); }

/* CTA */
.cta-section {
  position: relative; padding: 72px 0; overflow: hidden;
  background: radial-gradient(circle at 50% 50%, rgba(245, 165, 36, .12), transparent 70%), var(--bg-secondary);
}
.cta-box {
  max-width: 820px; margin: 0 auto; text-align: center;
  background: var(--bg-glass); border: 1px solid var(--border-accent); border-radius: var(--radius-lg);
  backdrop-filter: blur(14px); -webkit-backdrop-filter: blur(14px);
  padding: 52px 40px; box-shadow: var(--shadow-card);
}
.cta-box h2 { font-size: 28px; font-weight: 800; margin-bottom: 12px; }
.cta-box p { color: var(--text-secondary); margin-bottom: 28px; font-size: 15px; }
.cta-box .btn + .btn { margin-left: 12px; }

/* Footer */
.footer { background: rgba(4, 8, 15, .92); border-top: 1px solid var(--border); padding: 64px 24px 24px; }
.footer__brand { display: flex; align-items: center; gap: 12px; margin-bottom: 14px; }
.footer__brand .brand__logo { width: 44px; height: 44px; font-size: 16px; }
.footer__brand strong { font-size: 20px; font-weight: 700; display: block; line-height: 1.3; }
.footer__brand span { color: var(--text-secondary); font-size: 14px; }
.footer__desc { color: var(--text-muted); font-size: 14px; max-width: 640px; margin-bottom: 36px; line-height: 1.8; }
.footer__grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 32px; padding-bottom: 36px; border-bottom: 1px solid rgba(148, 163, 184, .1); }
.footer__col h4 { font-size: 15px; font-weight: 700; margin-bottom: 16px; color: var(--text-primary); }
.footer__col ul li { margin-bottom: 10px; }
.footer__col a { font-size: 14px; color: var(--text-muted); }
.footer__col a:hover { color: var(--accent); }
.footer__bottom { padding-top: 24px; text-align: center; font-size: 13px; color: var(--text-muted); }
.footer__bottom p { margin-bottom: 6px; }

/* Responsive */
@media (max-width: 1024px) {
  .overview-grid { grid-template-columns: repeat(2, 1fr); }
  .guide-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 768px) {
  .header__top { height: 56px; }
  .header__tools { display: none; }
  .nav__container { flex-direction: column; align-items: flex-start; padding: 10px 16px; }
  .nav__list { width: 100%; overflow-x: auto; flex-wrap: nowrap; padding-bottom: 4px; }
  .nav__link { white-space: nowrap; font-size: 14px; padding: 6px 12px; }
  .nav__cta { display: none; }
  .page-hero { padding: 48px 0 42px; }
  .page-hero__sub { font-size: 16px; }
  .platform-layout { grid-template-columns: 1fr; gap: 28px; }
  .sidebar-nav {
    position: static; display: flex; overflow-x: auto; padding: 12px; gap: 6px;
    align-items: center;
  }
  .sidebar-nav__title { display: none; }
  .sidebar-nav__link { white-space: nowrap; margin-bottom: 0; flex-shrink: 0; }
  .timeline__item { padding-left: 44px; }
  .timeline-card { grid-template-columns: 1fr; }
  .timeline-card__media img { height: 160px; }
  .overview-grid { grid-template-columns: 1fr; }
  .guide-grid { grid-template-columns: 1fr; }
  .footer__grid { grid-template-columns: repeat(2, 1fr); gap: 24px; }
  .cta-box { padding: 36px 22px; }
}
@media (max-width: 520px) {
  .container { padding-left: 16px; padding-right: 16px; }
  .brand__text span { display: none; }
  .footer__grid { grid-template-columns: 1fr; }
  .page-hero__actions { flex-direction: column; }
  .page-hero__actions .btn { width: 100%; }
  .footer__bottom { font-size: 12px; }
}

/* roulang page: article */
:root {
  --bg-primary: #0B1220;
  --bg-secondary: #111C2E;
  --bg-card: rgba(15,24,40,.88);
  --glass-bg: rgba(18,29,51,.62);
  --glass-border: rgba(0,212,255,.18);
  --primary: #1677FF;
  --primary-light: #00A9EE;
  --accent: #00D4FF;
  --warning: #F5A524;
  --success: #12B76A;
  --error: #F04438;
  --text-primary: #EAF0F8;
  --text-secondary: #A3B3CC;
  --text-muted: #6B7E9E;
  --border: rgba(148,163,184,.12);
  --radius-lg: 16px;
  --radius-md: 10px;
  --radius-sm: 4px;
  --shadow-card: 0 18px 40px rgba(3,8,18,.45);
  --shadow-glow: 0 8px 24px rgba(0,169,238,.32);
  --font-sans: "Source Han Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-mono: "JetBrains Mono", "Roboto Mono", Consolas, monospace;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font-sans);
  background: var(--bg-primary);
  color: var(--text-primary);
  line-height: 1.7;
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; display: block; }
a { color: inherit; }
ul, ol { list-style: none; }
button, input, select, textarea { font-family: inherit; font-size: inherit; }
::selection { background: rgba(0,212,255,.3); color: #fff; }
a:focus-visible, button:focus-visible, input:focus-visible, select:focus-visible, textarea:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 24px;
}

/* ===== Header ===== */
.header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(6,12,22,.88);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid rgba(148,163,184,.15);
}
.header__top-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
}
.brand__logo {
  width: 42px;
  height: 42px;
  border-radius: 12px;
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 800;
  color: #fff;
  font-size: 16px;
  letter-spacing: .04em;
  box-shadow: 0 4px 16px rgba(22,119,255,.35);
}
.brand__text {
  font-size: 20px;
  font-weight: 700;
  color: var(--text-primary);
  letter-spacing: .03em;
  line-height: 1.2;
}
.brand__text small {
  display: block;
  font-size: 11px;
  color: var(--text-muted);
  font-weight: 400;
  letter-spacing: .08em;
}
.header__actions {
  display: flex;
  gap: 12px;
}
.header__btn {
  padding: 8px 18px;
  border-radius: 10px;
  border: 1px solid rgba(234,240,248,.2);
  background: rgba(255,255,255,.04);
  color: var(--text-primary);
  font-size: 14px;
  text-decoration: none;
  transition: all .2s ease;
}
.header__btn:hover {
  border-color: var(--accent);
  color: var(--accent);
  background: rgba(0,212,255,.08);
  box-shadow: 0 4px 16px rgba(0,212,255,.15);
}

/* ===== Nav ===== */
.nav {
  border-top: 1px solid rgba(148,163,184,.1);
  position: relative;
}
.nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 48px;
}
.nav__list {
  display: flex;
  gap: 4px;
  align-items: center;
}
.nav__link {
  display: inline-block;
  padding: 8px 16px;
  border-radius: 999px;
  font-size: 15px;
  font-weight: 500;
  color: var(--text-secondary);
  text-decoration: none;
  transition: all .2s ease;
  position: relative;
}
.nav__link:hover {
  color: var(--accent);
  background: rgba(0,212,255,.08);
}
.nav__link.is-active {
  color: var(--accent);
  background: rgba(0,212,255,.08);
}
.nav__link.is-active::after {
  content: '';
  position: absolute;
  left: 16px;
  right: 16px;
  bottom: -2px;
  height: 2px;
  background: var(--accent);
  border-radius: 2px;
  box-shadow: 0 0 8px rgba(0,212,255,.6);
}
.btn--nav {
  display: inline-block;
  padding: 8px 22px;
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  color: #fff;
  border-radius: 10px;
  font-size: 14px;
  font-weight: 600;
  text-decoration: none;
  box-shadow: 0 4px 16px rgba(0,169,238,.32);
  transition: all .2s ease;
  white-space: nowrap;
}
.btn--nav:hover {
  box-shadow: 0 8px 32px rgba(0,169,238,.45);
  transform: translateY(-1px);
  filter: brightness(1.1);
}
.nav__toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  width: 40px;
  height: 40px;
  background: transparent;
  border: 1px solid rgba(148,163,184,.3);
  border-radius: 10px;
  padding: 9px 10px;
  cursor: pointer;
  transition: border-color .2s;
}
.nav__toggle:hover { border-color: var(--accent); }
.nav__toggle span {
  display: block;
  height: 2px;
  background: var(--text-primary);
  border-radius: 2px;
  transition: background .2s;
}
.nav__toggle:hover span { background: var(--accent); }
.nav-overlay {
  position: fixed;
  inset: 0;
  background: rgba(3,8,18,.65);
  backdrop-filter: blur(2px);
  opacity: 0;
  visibility: hidden;
  transition: all .3s ease;
  z-index: 998;
}
.nav-overlay.is-visible { opacity: 1; visibility: visible; }

/* ===== Breadcrumb ===== */
.breadcrumb {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 28px 0 0;
  font-size: 14px;
  color: var(--text-muted);
  flex-wrap: wrap;
}
.breadcrumb a {
  color: var(--text-secondary);
  text-decoration: none;
  transition: color .2s;
}
.breadcrumb a:hover { color: var(--accent); }
.breadcrumb__sep { color: var(--text-muted); opacity: .6; }
.breadcrumb__current {
  color: var(--text-muted);
  max-width: 300px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* ===== Article Header ===== */
.article-header {
  padding: 36px 0 28px;
}
.article-header h1 {
  font-size: clamp(28px, 4.5vw, 42px);
  font-weight: 800;
  line-height: 1.25;
  letter-spacing: .03em;
  margin-bottom: 20px;
}
.article-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
  color: var(--text-muted);
  font-size: 14px;
}
.article-meta__item {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}
.article-meta__item + .article-meta__item::before {
  content: '';
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: rgba(148,163,184,.4);
  margin-right: 8px;
}
.badge {
  display: inline-block;
  padding: 4px 12px;
  background: rgba(0,212,255,.12);
  color: var(--accent);
  font-size: 12px;
  border-radius: 999px;
  font-weight: 500;
}

/* ===== Article Wrap ===== */
.article-wrap {
  max-width: 760px;
  margin: 0 auto;
  padding: 0 24px 56px;
}
.article-content {
  background: rgba(13,20,36,.72);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 48px;
  font-size: 16px;
  line-height: 1.8;
  color: var(--text-primary);
  word-break: break-word;
}
.article-content h2 {
  font-size: 24px;
  font-weight: 700;
  margin: 36px 0 16px;
  padding-top: 20px;
  border-top: 1px solid rgba(148,163,184,.1);
  letter-spacing: .03em;
}
.article-content h3 {
  font-size: 20px;
  font-weight: 600;
  margin: 28px 0 12px;
  color: var(--accent);
}
.article-content p {
  margin-bottom: 24px;
  line-height: 1.8;
}
.article-content img {
  max-width: 100%;
  border-radius: 12px;
  display: block;
  margin: 24px auto;
  border: 1px solid rgba(148,163,184,.15);
}
.article-content blockquote {
  border-left: 3px solid var(--accent);
  background: rgba(0,212,255,.05);
  padding: 16px 20px;
  margin: 24px 0;
  border-radius: 0 12px 12px 0;
  color: var(--text-secondary);
  font-style: italic;
}
.article-content ul,
.article-content ol {
  margin: 16px 0 24px 24px;
  line-height: 1.8;
}
.article-content ul { list-style: disc; }
.article-content ol { list-style: decimal; }
.article-content li { margin-bottom: 8px; }
.article-content li::marker { color: var(--accent); }
.article-content a {
  color: var(--accent);
  text-decoration: underline;
  text-underline-offset: 3px;
}
.article-content a:hover { text-decoration: none; }
.article-content strong { color: var(--text-primary); font-weight: 700; }
.article-content table {
  width: 100%;
  border-collapse: collapse;
  margin: 24px 0;
  font-size: 14px;
}
.article-content th,
.article-content td {
  border: 1px solid rgba(148,163,184,.2);
  padding: 12px 14px;
  text-align: left;
}
.article-content th {
  background: rgba(0,212,255,.06);
  color: var(--text-primary);
  font-weight: 600;
}
.article-content code {
  background: rgba(0,212,255,.08);
  padding: 2px 8px;
  border-radius: 6px;
  font-family: var(--font-mono);
  font-size: .9em;
  color: var(--accent);
}
.article-content pre {
  background: rgba(4,8,15,.8);
  padding: 20px;
  border-radius: 12px;
  overflow-x: auto;
  margin: 24px 0;
  border: 1px solid rgba(148,163,184,.15);
}
.article-content pre code {
  background: none;
  padding: 0;
  color: var(--text-primary);
}

/* ===== Empty State ===== */
.article-empty {
  text-align: center;
  padding: 80px 32px;
  background: rgba(13,20,36,.72);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
}
.article-empty__icon {
  width: 64px;
  height: 64px;
  margin: 0 auto 20px;
  border-radius: 50%;
  background: rgba(0,212,255,.1);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 30px;
  color: var(--accent);
}
.article-empty p {
  font-size: 20px;
  color: var(--text-secondary);
  margin-bottom: 24px;
}

/* ===== Pager ===== */
.article-pager {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  padding-bottom: 72px;
  max-width: 760px;
  margin: 0 auto;
}
.btn--secondary {
  display: inline-block;
  padding: 10px 26px;
  border: 1px solid rgba(234,240,248,.4);
  border-radius: 10px;
  color: var(--text-primary);
  font-size: 14px;
  text-decoration: none;
  transition: all .2s ease;
  background: transparent;
  cursor: pointer;
}
.btn--secondary:hover {
  background: rgba(255,255,255,.08);
  border-color: var(--accent);
  color: var(--accent);
  transition: all .2s ease;
}
.btn--secondary:active {
  transform: translateY(1px);
}
.btn--primary {
  display: inline-block;
  padding: 12px 28px;
  background: linear-gradient(135deg, var(--primary), var(--primary-light));
  color: #fff;
  border-radius: 10px;
  font-size: 16px;
  font-weight: 600;
  text-decoration: none;
  box-shadow: var(--shadow-glow);
  transition: all .2s ease;
  border: none;
  cursor: pointer;
}
.btn--primary:hover {
  filter: brightness(1.1);
  box-shadow: 0 10px 32px rgba(0,169,238,.45);
  transform: translateY(-2px);
}
.btn--primary:active { transform: translateY(1px); }

/* ===== Related ===== */
.related {
  padding: 72px 0;
  background: var(--bg-secondary);
  border-top: 1px solid rgba(148,163,184,.08);
}
.related__head {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  margin-bottom: 36px;
  flex-wrap: wrap;
  gap: 16px;
}
.related h2 {
  font-size: 28px;
  font-weight: 700;
  letter-spacing: .03em;
}
.related__more {
  color: var(--text-secondary);
  font-size: 14px;
  text-decoration: none;
  transition: color .2s;
  display: inline-flex;
  align-items: center;
  gap: 4px;
}
.related__more:hover { color: var(--accent); }
.related__more:hover .relation__more-arrow { transform: translateX(3px); }
.relation__more-arrow { transition: transform .2s; }
.related__grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}
.related__card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  text-decoration: none;
  display: block;
  transition: all .2s ease;
}
.related__card:hover {
  transform: translateY(-4px);
  border-color: rgba(0,212,255,.4);
  box-shadow: var(--shadow-card);
}
.related__card img {
  width: 100%;
  aspect-ratio: 4/3;
  object-fit: cover;
  display: block;
  transition: transform .4s ease;
}
.related__card:hover img { transform: scale(1.03); }
.related__card__body {
  padding: 20px 20px 22px;
}
.related__card h3 {
  font-size: 16px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 10px;
  line-height: 1.5;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.related__card time {
  font-size: 13px;
  color: var(--text-muted);
  font-family: var(--font-mono);
}

/* ===== CTA ===== */
.cta-section {
  padding: 72px 0;
  background: var(--bg-primary);
}
.cta__card {
  background: radial-gradient(circle at 20% 20%, rgba(22,119,255,.25), transparent 60%),
              radial-gradient(circle at 80% 80%, rgba(0,212,255,.15), transparent 50%),
              rgba(13,20,36,.72);
  border: 1px solid rgba(0,212,255,.15);
  border-radius: 20px;
  padding: 56px 48px;
  text-align: center;
  position: relative;
  overflow: hidden;
}
.cta__card h2 {
  font-size: 32px;
  font-weight: 800;
  margin-bottom: 16px;
}
.cta__card p {
  color: var(--text-secondary);
  font-size: 16px;
  max-width: 560px;
  margin: 0 auto 32px;
  line-height: 1.7;
}
.cta__actions {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}

/* ===== Footer ===== */
.footer {
  background: rgba(4,8,15,.92);
  border-top: 1px solid rgba(148,163,184,.1);
  padding: 64px 24px 24px;
}
.footer__brand {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 16px;
}
.footer__brand .brand__logo {
  width: 36px;
  height: 36px;
  font-size: 14px;
  border-radius: 10px;
}
.footer__brand strong {
  font-size: 18px;
  color: var(--text-primary);
  display: block;
}
.footer__brand div > span {
  color: var(--text-muted);
  font-size: 13px;
}
.footer__desc {
  color: var(--text-muted);
  font-size: 14px;
  max-width: 560px;
  margin-bottom: 40px;
  line-height: 1.7;
}
.footer__grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 32px;
  margin-bottom: 48px;
}
.footer__col h4 {
  font-size: 15px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 16px;
  letter-spacing: .03em;
}
.footer__col ul li {
  margin-bottom: 10px;
}
.footer__col a {
  color: var(--text-secondary);
  font-size: 14px;
  text-decoration: none;
  transition: color .2s;
}
.footer__col a:hover {
  color: var(--accent);
}
.footer__bottom {
  border-top: 1px solid rgba(148,163,184,.1);
  padding-top: 24px;
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
}
.footer__bottom p {
  color: var(--text-muted);
  font-size: 13px;
}

/* ===== Scrollbar ===== */
::-webkit-scrollbar { width: 10px; }
::-webkit-scrollbar-track { background: var(--bg-primary); }
::-webkit-scrollbar-thumb {
  background: rgba(148,163,184,.25);
  border-radius: 5px;
}
::-webkit-scrollbar-thumb:hover { background: rgba(0,212,255,.4); }

/* ===== Responsive ===== */
@media (max-width: 992px) {
  .related__grid { grid-template-columns: repeat(2, 1fr); }
  .footer__grid { grid-template-columns: repeat(2, 1fr); }
  .article-content { padding: 36px; }
}

@media (max-width: 768px) {
  .container { padding: 0 16px; }
  .header__actions { display: none; }
  .nav__toggle { display: flex; }
  .nav__list {
    position: fixed;
    left: 0;
    top: 0;
    bottom: 0;
    width: 280px;
    background: rgba(6,12,22,.98);
    backdrop-filter: blur(14px);
    -webkit-backdrop-filter: blur(14px);
    flex-direction: column;
    gap: 6px;
    padding: 100px 24px 24px;
    transform: translateX(-100%);
    transition: transform .3s ease;
    z-index: 999;
    box-shadow: 0 0 40px rgba(3,8,18,.6);
    border-right: 1px solid rgba(148,163,184,.15);
  }
  .nav__list.is-open { transform: translateX(0); }
  .nav__link {
    display: block;
    font-size: 16px;
    padding: 12px 16px;
    border-radius: 10px;
  }
  .nav__link.is-active {
    background: linear-gradient(135deg, rgba(22,119,255,.25), rgba(0,169,238,.2));
    border-left: 3px solid var(--accent);
    border-radius: 8px;
  }
  .nav__link.is-active::after { display: none; }
  .nav__cta { display: none; }
  .breadcrumb { padding-top: 20px; }
  .article-header { padding: 24px 0 20px; }
  .article-header h1 { font-size: 26px; }
  .article-wrap { padding: 0 16px 40px; }
  .article-content { padding: 24px 20px; border-radius: 12px; }
  .article-content h2 { font-size: 20px; }
  .article-content h3 { font-size: 18px; }
  .article-pager {
    flex-direction: column;
    padding: 0 16px 48px;
  }
  .article-pager .btn--secondary { text-align: center; width: 100%; }
  .related { padding: 48px 0; }
  .related__grid { grid-template-columns: 1fr; gap: 16px; }
  .cta__card { padding: 40px 24px; }
  .cta__card h2 { font-size: 24px; }
  .footer { padding: 48px 16px 24px; }
  .footer__grid { grid-template-columns: 1fr; gap: 24px; }
  .footer__bottom { flex-direction: column; text-align: center; }
}

@media (max-width: 520px) {
  body { font-size: 15px; }
  .brand__text { font-size: 17px; }
  .related h2 { font-size: 22px; }
  .breadcrumb__current { max-width: 200px; }
}

/* roulang page: category2 */
:root {
  --bg-primary: #0B1220;
  --bg-secondary: #111C2E;
  --bg-elevated: rgba(15, 24, 40, .88);
  --bg-glass: rgba(18, 29, 51, .62);
  --brand-primary: #1677FF;
  --brand-secondary: #00A9EE;
  --accent: #00D4FF;
  --accent-rgb: 0, 212, 255;
  --highlight: #F5A524;
  --success: #12B76A;
  --error: #F04438;
  --text-primary: #EAF0F8;
  --text-secondary: #A3B3CC;
  --text-muted: #6B7E9E;
  --border-soft: rgba(148, 163, 184, .15);
  --radius-lg: 16px;
  --radius-md: 12px;
  --radius-sm: 10px;
  --shadow-card: 0 18px 40px rgba(3, 8, 18, .45);
  --shadow-glow: 0 8px 24px rgba(0, 169, 238, .32);
  --font-family: "Source Han Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-mono: "JetBrains Mono", "Roboto Mono", monospace;
  --space-section: 96px;
}

*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-family);
  font-size: 16px;
  line-height: 1.75;
  letter-spacing: .04em;
  color: var(--text-primary);
  background: var(--bg-primary);
  -webkit-font-smoothing: antialiased;
}

img {
  max-width: 100%;
  display: block;
}

a {
  color: inherit;
  text-decoration: none;
  transition: color .2s ease, background .2s ease, border-color .2s ease, box-shadow .2s ease, transform .2s ease;
}

ul,
ol {
  list-style: none;
}

button,
input,
select,
textarea {
  font-family: inherit;
  font-size: inherit;
  line-height: inherit;
  border: none;
  outline: none;
  background: none;
}

.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding-left: 24px;
  padding-right: 24px;
}

/* ===== Button ===== */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 28px;
  border-radius: var(--radius-sm);
  font-size: 16px;
  font-weight: 600;
  line-height: 1.2;
  cursor: pointer;
  transition: all .2s ease;
}

.btn--primary {
  background: linear-gradient(135deg, var(--brand-primary), var(--brand-secondary));
  color: #fff;
  box-shadow: var(--shadow-glow);
}

.btn--primary:hover {
  filter: brightness(1.1);
  box-shadow: 0 10px 32px rgba(0, 169, 238, .42);
  transform: translateY(-1px);
}

.btn--primary:active {
  transform: translateY(1px);
  box-shadow: 0 4px 16px rgba(0, 169, 238, .25);
}

.btn--primary:focus-visible,
.btn--ghost:focus-visible,
.btn--nav:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.btn--ghost {
  background: transparent;
  border: 1px solid rgba(234, 240, 248, .4);
  color: var(--text-primary);
}

.btn--ghost:hover {
  background: rgba(255, 255, 255, .08);
  border-color: var(--accent);
  color: var(--accent);
}

.btn--ghost:active {
  transform: translateY(1px);
}

.btn--nav {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 8px 22px;
  border-radius: 10px;
  font-size: 15px;
  font-weight: 600;
  color: #fff;
  background: linear-gradient(135deg, var(--brand-primary), var(--brand-secondary));
  box-shadow: 0 6px 20px rgba(0, 169, 238, .3);
  transition: all .2s ease;
}

.btn--nav:hover {
  filter: brightness(1.1);
  box-shadow: 0 8px 28px rgba(0, 169, 238, .4);
}

.btn--nav:active {
  transform: translateY(1px);
}

/* ===== Header ===== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(6, 12, 22, .88);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--border-soft);
}

.header__top {
  border-bottom: 1px solid rgba(148, 163, 184, .08);
}

.header__top-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
}

.brand__logo {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border-radius: 12px;
  background: linear-gradient(135deg, var(--brand-primary), var(--brand-secondary));
  color: #fff;
  font-size: 18px;
  font-weight: 800;
  letter-spacing: .02em;
  box-shadow: 0 6px 18px rgba(0, 169, 238, .3);
}

.brand__text {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
}

.brand__text strong {
  font-size: 19px;
  font-weight: 800;
  letter-spacing: .03em;
  color: var(--text-primary);
}

.brand__text span {
  font-size: 13px;
  font-weight: 500;
  color: var(--text-secondary);
  letter-spacing: .1em;
}

.header__actions {
  display: flex;
  gap: 12px;
}

.header__actions .btn--ghost {
  padding: 8px 18px;
  font-size: 14px;
  border-radius: 10px;
  background: rgba(18, 29, 51, .62);
  border: 1px solid rgba(0, 212, 255, .18);
  color: var(--text-primary);
}

.header__actions .btn--ghost:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.nav {
  background: transparent;
}

.nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 48px;
}

.nav__list {
  display: flex;
  align-items: center;
  gap: 4px;
}

.nav__link {
  position: relative;
  display: inline-block;
  padding: 10px 16px;
  font-size: 15px;
  font-weight: 500;
  color: var(--text-secondary);
  border-radius: 999px;
  transition: color .2s ease, background .2s ease;
}

.nav__link:hover {
  color: var(--accent);
  background: rgba(0, 212, 255, .08);
}

.nav__link.is-active {
  color: var(--text-primary);
  font-weight: 600;
}

.nav__link.is-active::after {
  content: "";
  position: absolute;
  left: 50%;
  bottom: 2px;
  transform: translateX(-50%);
  width: 22px;
  height: 2px;
  border-radius: 2px;
  background: var(--accent);
}

.nav__cta {
  margin-left: 16px;
}

/* ===== Hero ===== */
.hero {
  position: relative;
  min-height: 70vh;
  display: flex;
  align-items: center;
  padding: 72px 0;
  background: linear-gradient(rgba(11, 18, 32, .72), rgba(11, 18, 32, .85)), url('/assets/images/backpic/back-1.webp') no-repeat center center / cover;
  overflow: hidden;
}

.hero::before {
  content: "";
  position: absolute;
  top: -120px;
  left: -80px;
  width: 420px;
  height: 420px;
  background: radial-gradient(circle, rgba(22, 119, 255, .45), transparent 70%);
  pointer-events: none;
}

.hero::after {
  content: "";
  position: absolute;
  right: -60px;
  bottom: -100px;
  width: 360px;
  height: 360px;
  background: radial-gradient(circle, rgba(0, 212, 255, .18), transparent 70%);
  pointer-events: none;
}

.hero__inner {
  position: relative;
  z-index: 2;
  display: grid;
  grid-template-columns: 1.2fr .8fr;
  gap: 48px;
  align-items: center;
}

.hero__content {
  max-width: 620px;
}

.hero__badge {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 16px;
  border-radius: 999px;
  background: rgba(0, 212, 255, .12);
  border: 1px solid rgba(0, 212, 255, .25);
  color: var(--accent);
  font-size: 14px;
  font-weight: 500;
  margin-bottom: 24px;
}

.hero__title {
  font-size: clamp(32px, 5vw, 48px);
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: .03em;
  color: var(--text-primary);
  margin-bottom: 20px;
}

.hero__title em {
  font-style: normal;
  background: linear-gradient(135deg, var(--accent), var(--brand-secondary));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero__desc {
  font-size: 17px;
  line-height: 1.8;
  color: var(--text-secondary);
  margin-bottom: 36px;
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
}

.hero__card {
  background: var(--bg-glass);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border: 1px solid rgba(0, 212, 255, .18);
  border-radius: var(--radius-lg);
  padding: 28px;
  box-shadow: var(--shadow-card);
}

.hero__card h3 {
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 8px;
  color: var(--text-primary);
}

.hero__card p {
  font-size: 14px;
  color: var(--text-secondary);
  margin-bottom: 16px;
}

.hero__card .card__meta {
  display: flex;
  align-items: center;
  gap: 12px;
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--accent);
  margin-bottom: 20px;
}

/* ===== Section ===== */
.section {
  padding: var(--space-section) 0;
}

.section--secondary {
  background: var(--bg-secondary);
}

.section__header {
  text-align: center;
  max-width: 720px;
  margin: 0 auto 56px;
}

.section__title {
  font-size: 28px;
  font-weight: 800;
  line-height: 1.3;
  letter-spacing: .03em;
  margin-bottom: 12px;
  color: var(--text-primary);
}

.section__title em {
  font-style: normal;
  color: var(--accent);
}

.section__desc {
  font-size: 16px;
  color: var(--text-secondary);
  line-height: 1.8;
}

/* ===== Overview ===== */
.overview-card {
  position: relative;
  display: grid;
  grid-template-columns: 1.1fr .9fr;
  gap: 32px;
  background: var(--bg-glass);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border: 1px solid rgba(0, 212, 255, .22);
  border-radius: var(--radius-lg);
  padding: 40px;
  box-shadow: var(--shadow-card);
  overflow: hidden;
}

.overview-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: radial-gradient(circle at right top, rgba(0, 212, 255, .08), transparent 60%);
  pointer-events: none;
}

.overview-card__left {
  position: relative;
  z-index: 1;
}

.overview-card__tag {
  display: inline-block;
  padding: 4px 12px;
  border-radius: 999px;
  background: rgba(245, 165, 36, .14);
  border: 1px solid rgba(245, 165, 36, .3);
  color: var(--highlight);
  font-size: 13px;
  font-weight: 600;
  margin-bottom: 16px;
}

.overview-card__title {
  font-size: 28px;
  font-weight: 800;
  line-height: 1.3;
  margin-bottom: 16px;
}

.overview-card__desc {
  font-size: 15px;
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: 20px;
}

.overview-card__list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.overview-card__list li {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  font-size: 15px;
  color: var(--text-primary);
}

.overview-card__list li i {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 22px;
  height: 22px;
  flex: 0 0 22px;
  border-radius: 50%;
  background: rgba(0, 212, 255, .12);
  color: var(--accent);
  font-size: 13px;
  font-style: normal;
}

.overview-card__right {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 28px;
  background: rgba(10, 18, 32, .55);
  border-radius: var(--radius-lg);
  border: 1px solid rgba(148, 163, 184, .12);
}

.overview-card__right h4 {
  font-size: 16px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 16px;
}

.overview-card__time {
  display: flex;
  align-items: center;
  gap: 12px;
  font-family: var(--font-mono);
  font-size: 15px;
  color: var(--accent);
  margin-bottom: 8px;
}

.overview-card__time span {
  font-family: var(--font-family);
  font-size: 14px;
  color: var(--text-secondary);
}

.overview-card__right .btn {
  margin-top: 20px;
}

/* ===== Steps ===== */
.steps-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.step-card {
  position: relative;
  padding: 28px 24px;
  background: var(--bg-elevated);
  border: 1px solid rgba(148, 163, 184, .12);
  border-radius: var(--radius-lg);
  transition: border-color .2s ease, transform .2s ease, box-shadow .2s ease;
}

.step-card:hover {
  border-color: rgba(0, 212, 255, .4);
  transform: translateY(-4px);
  box-shadow: var(--shadow-card);
}

.step-card__num {
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 700;
  color: var(--accent);
  letter-spacing: .08em;
  margin-bottom: 12px;
}

.step-card__dot {
  position: absolute;
  top: 24px;
  right: 24px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 12px rgba(0, 212, 255, .8);
}

.step-card h3 {
  font-size: 18px;
  font-weight: 700;
  margin-bottom: 10px;
  color: var(--text-primary);
}

.step-card p {
  font-size: 14px;
  line-height: 1.75;
  color: var(--text-secondary);
}

/* ===== Rules Table ===== */
.table-wrap {
  background: var(--bg-elevated);
  border: 1px solid rgba(148, 163, 184, .12);
  border-radius: var(--radius-lg);
  padding: 24px;
  overflow-x: auto;
}

.rules-table {
  width: 100%;
  min-width: 760px;
  border-collapse: collapse;
}

.rules-table thead th {
  padding: 16px 18px;
  text-align: left;
  font-size: 14px;
  font-weight: 700;
  color: var(--text-primary);
  background: rgba(0, 212, 255, .06);
  border-bottom: 1px solid rgba(0, 212, 255, .18);
}

.rules-table tbody td {
  padding: 16px 18px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--text-secondary);
  border-bottom: 1px solid rgba(148, 163, 184, .08);
}

.rules-table tbody tr:last-child td {
  border-bottom: none;
}

.rules-table tbody tr:hover td {
  background: rgba(0, 212, 255, .03);
}

.rules-table tbody td strong {
  color: var(--text-primary);
  font-weight: 600;
}

/* ===== Featured ===== */
.featured-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

.feature-card {
  background: var(--bg-elevated);
  border: 1px solid rgba(148, 163, 184, .12);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: border-color .2s ease, transform .2s ease, box-shadow .2s ease;
}

.feature-card:hover {
  border-color: rgba(0, 212, 255, .4);
  transform: translateY(-4px);
  box-shadow: var(--shadow-card);
}

.feature-card__img {
  position: relative;
  aspect-ratio: 4 / 3;
  overflow: hidden;
}

.feature-card__img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform .3s ease;
}

.feature-card:hover .feature-card__img img {
  transform: scale(1.04);
}

.feature-card__badge {
  position: absolute;
  top: 14px;
  left: 14px;
  z-index: 2;
  padding: 4px 12px;
  border-radius: 999px;
  background: rgba(0, 212, 255, .14);
  border: 1px solid rgba(0, 212, 255, .3);
  color: var(--accent);
  font-size: 12px;
  font-weight: 600;
}

.feature-card__body {
  padding: 24px;
}

.feature-card__body h3 {
  font-size: 20px;
  font-weight: 700;
  margin-bottom: 10px;
  color: var(--text-primary);
}

.feature-card__body p {
  font-size: 14px;
  line-height: 1.75;
  color: var(--text-secondary);
  margin-bottom: 16px;
}

.feature-card__more {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 14px;
  font-weight: 600;
  color: var(--accent);
}

.feature-card__more span {
  transition: transform .2s ease;
}

.feature-card__more:hover span {
  transform: translateX(4px);
}

/* ===== FAQ ===== */
.faq-list {
  max-width: 820px;
  margin: 0 auto;
  background: var(--bg-elevated);
  border: 1px solid rgba(148, 163, 184, .12);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.faq-item {
  border-bottom: 1px solid rgba(148, 163, 184, .08);
}

.faq-item:last-child {
  border-bottom: none;
}

.faq-item__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  width: 100%;
  min-height: 56px;
  padding: 16px 24px;
  font-size: 16px;
  font-weight: 600;
  color: var(--text-primary);
  text-align: left;
  cursor: pointer;
  transition: color .2s ease, background .2s ease;
}

.faq-item__header:hover {
  background: rgba(255, 255, 255, .02);
  color: var(--accent);
}

.faq-item__icon {
  flex: 0 0 24px;
  width: 24px;
  height: 24px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  font-weight: 300;
  color: var(--text-secondary);
  transition: transform .2s ease, color .2s ease;
}

.faq-item__body {
  display: none;
  padding: 4px 24px 20px;
  font-size: 14px;
  line-height: 1.8;
  color: var(--text-secondary);
  background: rgba(255, 255, 255, .02);
}

.faq-item.is-open .faq-item__header {
  color: var(--accent);
}

.faq-item.is-open .faq-item__icon {
  transform: rotate(45deg);
  color: var(--accent);
}

.faq-item.is-open .faq-item__body {
  display: block;
}

/* ===== CTA ===== */
.cta-section {
  position: relative;
  background: var(--bg-secondary);
  overflow: hidden;
}

.cta-section::before {
  content: "";
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 520px;
  height: 520px;
  background: radial-gradient(circle, rgba(245, 165, 36, .12), transparent 70%);
  pointer-events: none;
}

.cta-box {
  position: relative;
  z-index: 2;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
  flex-wrap: wrap;
  background: var(--bg-glass);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border: 1px solid rgba(0, 212, 255, .18);
  border-radius: var(--radius-lg);
  padding: 40px;
  box-shadow: var(--shadow-card);
}

.cta-box__text h2 {
  font-size: 28px;
  font-weight: 800;
  margin-bottom: 10px;
  color: var(--text-primary);
}

.cta-box__text p {
  font-size: 15px;
  color: var(--text-secondary);
  line-height: 1.8;
  max-width: 560px;
}

.cta-box__actions {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}

/* ===== Footer ===== */
.footer {
  background: rgba(4, 8, 15, .92);
  border-top: 1px solid rgba(148, 163, 184, .1);
  padding: 64px 24px 24px;
}

.footer__brand {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 16px;
}

.footer__brand .brand__logo {
  width: 40px;
  height: 40px;
  font-size: 16px;
}

.footer__brand strong {
  font-size: 18px;
  color: var(--text-primary);
}

.footer__brand span {
  font-size: 14px;
  color: var(--text-secondary);
}

.footer__desc {
  font-size: 14px;
  color: var(--text-muted);
  line-height: 1.8;
  max-width: 760px;
  margin-bottom: 40px;
}

.footer__grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 40px;
  padding-bottom: 40px;
  border-bottom: 1px solid rgba(148, 163, 184, .08);
}

.footer__col h4 {
  font-size: 15px;
  font-weight: 700;
  color: var(--text-primary);
  margin-bottom: 16px;
}

.footer__col ul {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer__col ul li a {
  font-size: 14px;
  color: var(--text-muted);
  transition: color .2s ease;
}

.footer__col ul li a:hover {
  color: var(--accent);
}

.footer__bottom {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  padding-top: 24px;
  font-size: 13px;
  color: var(--text-muted);
}

/* ===== Responsive ===== */
@media (max-width: 1024px) {
  :root {
    --space-section: 72px;
  }

  .hero__inner {
    grid-template-columns: 1fr;
    gap: 32px;
  }

  .hero__card {
    max-width: 480px;
  }

  .steps-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .featured-grid {
    grid-template-columns: repeat(2, 1fr);
  }

  .overview-card {
    grid-template-columns: 1fr;
    padding: 28px;
  }

  .cta-box {
    padding: 28px;
  }
}

@media (max-width: 768px) {
  :root {
    --space-section: 56px;
  }

  .header__top-inner {
    height: auto;
    padding: 12px 0;
    flex-wrap: wrap;
    gap: 8px;
  }

  .header__actions {
    display: none;
  }

  .nav__inner {
    flex-direction: column;
    align-items: stretch;
    gap: 8px;
    padding: 8px 0;
  }

  .nav__list {
    flex-wrap: nowrap;
    overflow-x: auto;
    -webkit-overflow-scrolling: touch;
    gap: 2px;
    padding-bottom: 4px;
  }

  .nav__link {
    white-space: nowrap;
    padding: 8px 14px;
    font-size: 14px;
  }

  .nav__cta {
    margin-left: 0;
    display: flex;
    justify-content: center;
  }

  .btn--nav {
    width: 100%;
  }

  .hero {
    min-height: auto;
    padding: 56px 0;
  }

  .hero__title {
    font-size: 32px;
  }

  .hero__actions {
    flex-direction: column;
  }

  .hero__actions .btn {
    width: 100%;
  }

  .section__title {
    font-size: 24px;
  }

  .steps-grid {
    grid-template-columns: 1fr;
  }

  .featured-grid {
    grid-template-columns: 1fr;
  }

  .overview-card {
    padding: 24px;
  }

  .overview-card__right {
    padding: 20px;
  }

  .rules-table {
    min-width: 640px;
  }

  .faq-item__header {
    padding: 14px 16px;
    font-size: 15px;
  }

  .faq-item__body {
    padding: 4px 16px 16px;
  }

  .cta-box {
    flex-direction: column;
    align-items: flex-start;
  }

  .cta-box__actions {
    width: 100%;
  }

  .cta-box__actions .btn {
    flex: 1;
  }

  .footer {
    padding: 48px 16px 20px;
  }

  .footer__grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 32px;
  }

  .footer__bottom {
    flex-direction: column;
    align-items: flex-start;
  }
}

@media (max-width: 520px) {
  .container {
    padding-left: 16px;
    padding-right: 16px;
  }

  .brand__logo {
    width: 38px;
    height: 38px;
    font-size: 15px;
  }

  .brand__text strong {
    font-size: 17px;
  }

  .hero__badge {
    font-size: 13px;
  }

  .hero__desc {
    font-size: 15px;
  }

  .overview-card {
    padding: 20px;
    gap: 20px;
  }

  .overview-card__title {
    font-size: 22px;
  }

  .feature-card__body {
    padding: 20px;
  }

  .cta-box {
    padding: 24px 20px;
  }

  .cta-box__text h2 {
    font-size: 24px;
  }
}

/* roulang page: category3 */
:root{
  --color-bg:#0B1220;
  --color-bg-soft:#111C2E;
  --color-card:rgba(15,24,40,.88);
  --color-glass:rgba(18,29,51,.62);
  --color-primary:#1677FF;
  --color-primary-light:#00A9EE;
  --color-accent:#00D4FF;
  --color-accent-border:rgba(0,212,255,.18);
  --color-warm:#F5A524;
  --color-success:#12B76A;
  --color-error:#F04438;
  --color-text:#EAF0F8;
  --color-text-secondary:#A3B3CC;
  --color-text-muted:#6B7E9E;
  --color-border:rgba(148,163,184,.15);
  --radius-lg:16px;
  --radius-md:10px;
  --radius-pill:999px;
  --shadow-card:0 18px 40px rgba(3,8,18,.45);
  --shadow-glow:0 8px 24px rgba(0,169,238,.32);
  --font-main:"Source Han Sans SC","PingFang SC","Microsoft YaHei",sans-serif;
  --font-mono:"JetBrains Mono","Roboto Mono",monospace;
  --container:1200px;
  --space-section:96px;
  --transition:.2s ease;
}
*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  font-family:var(--font-main);
  background:var(--color-bg);
  color:var(--color-text);
  line-height:1.75;
  letter-spacing:.05em;
  -webkit-font-smoothing:antialiased;
}
img{display:block;max-width:100%}
a{color:inherit;text-decoration:none}
button{font-family:inherit;cursor:pointer}
ul,ol{list-style:none}
input,button,textarea{font-family:inherit}
.container{max-width:var(--container);margin:0 auto;padding:0 24px}
.section{padding:var(--space-section) 0}
.section--alt{background:var(--color-bg-soft)}

/* ---------- 按钮 ---------- */
.btn--primary{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  background:linear-gradient(135deg,var(--color-primary),var(--color-primary-light));
  color:#fff;font-size:16px;font-weight:600;padding:12px 28px;
  border-radius:10px;border:none;
  box-shadow:var(--shadow-glow);
  transition:filter .2s ease,box-shadow .2s ease,transform .2s ease;
}
.btn--primary:hover{filter:brightness(1.1);box-shadow:0 8px 32px rgba(0,169,238,.45)}
.btn--primary:active{transform:translateY(1px)}
.btn--primary:focus-visible{outline:2px solid var(--color-accent);outline-offset:2px}
.btn--primary:disabled{opacity:.5;box-shadow:none;cursor:not-allowed}

.btn--secondary{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  background:transparent;color:var(--color-text);
  border:1px solid rgba(234,240,248,.4);
  padding:12px 28px;border-radius:10px;font-size:16px;font-weight:500;
  transition:background .2s ease,border-color .2s ease,color .2s ease;
}
.btn--secondary:hover{background:rgba(255,255,255,.08);border-color:var(--color-accent);color:var(--color-accent)}
.btn--secondary:active{transform:translateY(1px)}
.btn--secondary:focus-visible{outline:2px solid var(--color-accent);outline-offset:2px}

.btn--ghost{
  display:inline-flex;align-items:center;justify-content:center;
  background:rgba(255,255,255,.04);color:var(--color-text-secondary);
  border:1px solid rgba(148,163,184,.25);
  border-radius:10px;font-size:14px;padding:8px 18px;
  transition:border-color .2s ease,color .2s ease,background .2s ease;
}
.btn--ghost:hover{border-color:var(--color-accent);color:var(--color-accent);background:rgba(0,212,255,.06)}
.btn--ghost:focus-visible{outline:2px solid var(--color-accent);outline-offset:2px}
.btn--sm{padding:6px 14px;font-size:13px}

.btn--nav{
  display:inline-flex;align-items:center;justify-content:center;
  background:linear-gradient(135deg,var(--color-primary),var(--color-primary-light));
  color:#fff;font-size:15px;font-weight:600;
  padding:8px 24px;border-radius:var(--radius-pill);
  box-shadow:var(--shadow-glow);
  transition:filter .2s ease,box-shadow .2s ease;
  white-space:nowrap;
}
.btn--nav:hover{filter:brightness(1.1);box-shadow:0 8px 32px rgba(0,169,238,.45)}
.btn--nav:focus-visible{outline:2px solid var(--color-accent);outline-offset:2px}

.link--arrow{
  display:inline-flex;align-items:center;gap:6px;
  color:var(--color-text-secondary);font-size:15px;
  transition:color .2s ease,gap .2s ease;
}
.link--arrow:hover{color:var(--color-accent);gap:10px}
.link--arrow:focus-visible{outline:2px solid var(--color-accent);outline-offset:2px;border-radius:4px}

/* ---------- 顶部导航 ---------- */
.site-header{
  position:sticky;top:0;z-index:100;
  background:rgba(6,12,22,.88);
  backdrop-filter:blur(14px);
  -webkit-backdrop-filter:blur(14px);
  border-bottom:1px solid var(--color-border);
}
.topbar__inner{display:flex;align-items:center;justify-content:space-between;height:64px}
.brand{display:inline-flex;align-items:center;gap:10px}
.brand__logo{
  display:inline-flex;align-items:center;justify-content:center;
  width:40px;height:40px;border-radius:10px;
  background:linear-gradient(135deg,var(--color-primary),var(--color-primary-light));
  color:#fff;font-weight:800;font-size:18px;letter-spacing:.02em;
  box-shadow:0 4px 14px rgba(0,169,238,.35);
}
.brand__text{display:flex;flex-direction:column;line-height:1.2}
.brand__text strong{font-size:17px;font-weight:700;letter-spacing:.03em}
.brand__text span{font-size:12px;color:var(--color-text-muted);letter-spacing:.08em}
.topbar__actions{display:flex;align-items:center;gap:12px}

.nav{border-top:1px solid rgba(148,163,184,.08)}
.nav__inner{display:flex;align-items:center;justify-content:space-between;min-height:48px}
.nav__list{display:flex;align-items:center;gap:4px;flex-wrap:wrap}
.nav__link{
  display:inline-flex;align-items:center;
  font-size:15px;font-weight:500;color:var(--color-text-secondary);
  padding:8px 16px;border-radius:var(--radius-pill);
  transition:color .2s ease,background .2s ease;
  position:relative;
}
.nav__link:hover{color:var(--color-accent);background:rgba(0,212,255,.08)}
.nav__link:focus-visible{outline:2px solid var(--color-accent);outline-offset:2px}
.nav__link.is-active{color:#fff}
.nav__link.is-active::after{
  content:"";position:absolute;left:16px;right:16px;bottom:0;
  height:2px;background:var(--color-accent);border-radius:2px;
}
.nav__cta{margin-left:8px;flex-shrink:0}
.nav__toggle{display:none}

/* ---------- Hero ---------- */
.hero{
  position:relative;
  padding:120px 0 96px;
  background:
    radial-gradient(circle at 18% 22%,rgba(22,119,255,.45),transparent 46%),
    radial-gradient(circle at 82% 78%,rgba(0,212,255,.14),transparent 40%),
    url('/assets/images/backpic/back-1.webp') center/cover no-repeat,
    var(--color-bg);
}
.hero::before{
  content:"";position:absolute;inset:0;
  background:
    linear-gradient(90deg,rgba(11,18,32,.72) 0%,rgba(11,18,32,.55) 55%,rgba(11,18,32,.25) 100%),
    repeating-linear-gradient(0deg,transparent,transparent 35px,rgba(0,212,255,.03) 35px,rgba(0,212,255,.03) 36px);
  z-index:1;
}
.hero__inner{position:relative;z-index:2;display:grid;grid-template-columns:1.2fr .8fr;gap:48px;align-items:center}
.hero__tag{
  display:inline-flex;align-items:center;
  background:rgba(0,212,255,.12);color:var(--color-accent);
  border:1px solid var(--color-accent-border);
  padding:4px 14px;border-radius:var(--radius-pill);
  font-size:13px;margin-bottom:20px;letter-spacing:.08em;
}
.hero__content h1{
  font-size:clamp(34px,5vw,52px);
  font-weight:800;line-height:1.2;letter-spacing:.03em;
  margin-bottom:18px;
}
.hero__content p{
  font-size:17px;color:var(--color-text-secondary);
  max-width:540px;margin-bottom:32px;
}
.hero__actions{display:flex;gap:16px;flex-wrap:wrap}
.hero__stats{
  display:flex;align-items:center;justify-content:center;gap:28px;
  background:var(--color-glass);
  border:1px solid var(--color-accent-border);
  border-radius:var(--radius-lg);
  padding:36px 24px;
  backdrop-filter:blur(14px);
  -webkit-backdrop-filter:blur(14px);
  box-shadow:var(--shadow-card);
}
.hero__stat{text-align:center}
.hero__stat-num{
  display:block;
  font-family:var(--font-mono);
  font-size:42px;font-weight:700;color:var(--color-accent);
  line-height:1.1;
}
.hero__stat-label{font-size:14px;color:var(--color-text-secondary);margin-top:8px}
.hero__stat-divider{width:1px;height:52px;background:var(--color-border)}

/* ---------- 板块头 ---------- */
.section__head{
  display:flex;align-items:flex-end;justify-content:space-between;
  gap:20px;margin-bottom:40px;flex-wrap:wrap;
}
.section__head h2{font-size:28px;font-weight:700;letter-spacing:.03em;position:relative;padding-left:16px}
.section__head h2::before{
  content:"";position:absolute;left:0;top:50%;transform:translateY(-50%);
  width:4px;height:24px;border-radius:4px;
  background:linear-gradient(180deg,var(--color-primary),var(--color-accent));
}
.section__head p{color:var(--color-text-secondary);font-size:15px;width:100%}

/* ---------- 焦点专题 ---------- */
.featured__card{
  position:relative;overflow:hidden;
  border-radius:var(--radius-lg);
  border:1px solid var(--color-accent-border);
  min-height:420px;
  display:flex;align-items:flex-end;
  box-shadow:var(--shadow-card);
}
.featured__bg{
  position:absolute;inset:0;
  background:url('/assets/images/backpic/back-2.png') center/cover no-repeat;
  z-index:0;
}
.featured__bg::after{
  content:"";position:absolute;inset:0;
  background:linear-gradient(180deg,rgba(11,18,32,.12) 0%,rgba(11,18,32,.85) 78%,rgba(11,18,32,.95) 100%);
}
.featured__content{
  position:relative;z-index:2;
  padding:48px;max-width:680px;
}
.badge{
  display:inline-flex;align-items:center;
  background:rgba(0,212,255,.12);color:var(--color-accent);
  font-size:12px;padding:4px 14px;border-radius:var(--radius-pill);
  border:1px solid var(--color-accent-border);
  margin-bottom:16px;
}
.featured__content h3{font-size:clamp(22px,3vw,30px);font-weight:700;line-height:1.35;margin-bottom:16px}
.featured__content p{color:var(--color-text-secondary);font-size:16px;margin-bottom:24px;line-height:1.8}

/* ---------- 资讯网格 ---------- */
.topic-grid__tags{display:flex;gap:10px;flex-wrap:wrap;margin-bottom:32px}
.topic-tag{
  display:inline-flex;align-items:center;gap:6px;
  background:rgba(11,18,32,.7);
  border:1px solid rgba(148,163,184,.2);
  color:var(--color-text-secondary);
  font-size:13px;padding:6px 16px;border-radius:var(--radius-pill);
  transition:border-color .2s ease,color .2s ease,background .2s ease;
}
.topic-tag:hover{border-color:var(--color-accent);color:var(--color-accent);background:rgba(0,212,255,.06)}
.topic-tag:focus-visible{outline:2px solid var(--color-accent);outline-offset:2px}
.topic-tag.is-hot{background:rgba(245,165,36,.12);border-color:rgba(245,165,36,.35);color:var(--color-warm)}

.topic-grid__row-2{display:grid;grid-template-columns:1fr 1fr;gap:24px;margin-bottom:24px}
.topic-grid__row-3{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}

.topic-card{
  background:var(--color-card);
  border:1px solid rgba(148,163,184,.12);
  border-radius:var(--radius-lg);
  overflow:hidden;
  transition:transform .2s ease,border-color .2s ease,box-shadow .2s ease;
  display:flex;flex-direction:column;
}
.topic-card:hover{transform:translateY(-4px);border-color:rgba(0,212,255,.4);box-shadow:var(--shadow-card)}
.topic-card:focus-within{outline:2px solid var(--color-accent);outline-offset:2px}
.topic-card__img{position:relative;overflow:hidden;aspect-ratio:4/3}
.topic-card--wide .topic-card__img{aspect-ratio:16/10}
.topic-card__img img{width:100%;height:100%;object-fit:cover;transition:transform .3s ease}
.topic-card:hover .topic-card__img img{transform:scale(1.05)}
.topic-card__img .badge{position:absolute;top:14px;left:14px;z-index:2;margin:0;background:rgba(11,18,32,.72);backdrop-filter:blur(6px)}
.topic-card__body{padding:20px 22px 24px;display:flex;flex-direction:column;flex:1}
.topic-card__body h3{
  font-size:18px;font-weight:700;line-height:1.4;
  margin-bottom:10px;
}
.topic-card__body h3 a{transition:color .2s ease}
.topic-card__body h3 a:hover{color:var(--color-accent)}
.topic-card__body p{color:var(--color-text-secondary);font-size:14px;line-height:1.7;margin-bottom:16px;flex:1}
.topic-card__meta{
  display:flex;align-items:center;justify-content:space-between;
  color:var(--color-text-muted);font-size:13px;
  border-top:1px solid rgba(148,163,184,.1);
  padding-top:14px;
}
.topic-card__meta a{color:var(--color-accent);font-size:14px;display:inline-flex;align-items:center;gap:4px;transition:gap .2s ease}
.topic-card__meta a:hover{gap:8px}

/* ---------- 专题分类 ---------- */
.topics__grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.topic-pill{
  display:flex;align-items:center;justify-content:space-between;
  background:var(--color-glass);
  border:1px solid var(--color-accent-border);
  border-radius:var(--radius-lg);
  padding:24px 26px;
  backdrop-filter:blur(12px);
  transition:transform .2s ease,border-color .2s ease,box-shadow .2s ease;
}
.topic-pill:hover{transform:translateY(-3px);border-color:rgba(0,212,255,.5);box-shadow:var(--shadow-card)}
.topic-pill:focus-visible{outline:2px solid var(--color-accent);outline-offset:2px}
.topic-pill__name{
  display:flex;flex-direction:column;gap:4px;
}
.topic-pill__name strong{font-size:17px;font-weight:700}
.topic-pill__name span{font-size:13px;color:var(--color-text-muted)}
.topic-pill__count{
  font-family:var(--font-mono);
  font-size:14px;color:var(--color-accent);
  background:rgba(0,212,255,.1);
  padding:4px 12px;border-radius:var(--radius-pill);
  white-space:nowrap;
}

/* ---------- 订阅 ---------- */
.newsletter__card{
  background:var(--color-glass);
  border:1px solid var(--color-accent-border);
  border-radius:var(--radius-lg);
  padding:56px 48px;
  text-align:center;
  backdrop-filter:blur(14px);
  -webkit-backdrop-filter:blur(14px);
  position:relative;overflow:hidden;
}
.newsletter__card::before{
  content:"";position:absolute;top:-60px;right:-60px;width:220px;height:220px;
  background:radial-gradient(circle,rgba(0,212,255,.16),transparent 70%);
  pointer-events:none;
}
.newsletter__card h2{font-size:28px;font-weight:700;margin-bottom:12px}
.newsletter__card p{color:var(--color-text-secondary);margin-bottom:28px;max-width:520px;margin-left:auto;margin-right:auto}
.newsletter__form{display:flex;gap:12px;max-width:480px;margin:0 auto;flex-wrap:wrap;justify-content:center}
.newsletter__form input{
  flex:1;min-width:220px;
  background:rgba(10,18,32,.7);
  border:1px solid rgba(148,163,184,.25);
  border-radius:10px;padding:12px 16px;
  color:var(--color-text);
  font-size:15px;
  transition:border-color .2s ease,box-shadow .2s ease;
}
.newsletter__form input::placeholder{color:var(--color-text-muted)}
.newsletter__form input:focus{outline:none;border-color:var(--color-accent);box-shadow:0 0 0 4px rgba(0,212,255,.18)}
.newsletter__hint{font-size:12px;color:var(--color-text-muted);margin-top:14px}

/* ---------- FAQ ---------- */
.faq{max-width:860px;margin:0 auto}
.faq__item{
  background:var(--color-card);
  border:1px solid rgba(148,163,184,.12);
  border-radius:var(--radius-lg);
  margin-bottom:14px;overflow:hidden;
  transition:border-color .2s ease;
}
.faq__item.is-open{border-color:rgba(0,212,255,.4)}
.faq__header{
  width:100%;display:flex;align-items:center;justify-content:space-between;
  padding:20px 24px;background:transparent;border:none;
  color:var(--color-text);font-size:16px;font-weight:500;
  text-align:left;gap:16px;
  transition:color .2s ease;
}
.faq__header:hover{color:var(--color-accent)}
.faq__header:focus-visible{outline:2px solid var(--color-accent);outline-offset:-2px}
.faq__icon{
  flex-shrink:0;width:28px;height:28px;border-radius:50%;
  display:inline-flex;align-items:center;justify-content:center;
  background:rgba(0,212,255,.1);color:var(--color-accent);
  font-size:18px;font-weight:400;
  transition:transform .2s ease,background .2s ease;
}
.faq__item.is-open .faq__icon{transform:rotate(45deg);background:rgba(0,212,255,.2)}
.faq__content{
  max-height:0;overflow:hidden;
  transition:max-height .3s ease;
  background:rgba(255,255,255,.02);
}
.faq__content-inner{padding:4px 24px 24px;color:var(--color-text-secondary);font-size:15px;line-height:1.8;border-top:1px solid rgba(148,163,184,.08)}

/* ---------- 最终 CTA ---------- */
.final-cta__card{
  background:
    radial-gradient(circle at 80% 20%,rgba(245,165,36,.12),transparent 48%),
    url('/assets/images/backpic/back-3.png') center/cover no-repeat,
    var(--color-bg-soft);
  border:1px solid var(--color-accent-border);
  border-radius:var(--radius-lg);
  padding:72px 48px;text-align:center;position:relative;overflow:hidden;
}
.final-cta__card::before{
  content:"";position:absolute;inset:0;
  background:linear-gradient(180deg,rgba(11,18,32,.65),rgba(11,18,32,.9));
  z-index:0;
}
.final-cta__card>*{position:relative;z-index:1}
.final-cta__card h2{font-size:clamp(24px,3vw,34px);font-weight:800;margin-bottom:14px}
.final-cta__card p{color:var(--color-text-secondary);margin-bottom:28px;max-width:520px;margin-left:auto;margin-right:auto}

/* ---------- 页脚 ---------- */
.footer{
  background:rgba(4,8,15,.92);
  border-top:1px solid rgba(148,163,184,.1);
  padding:64px 24px 24px;margin-top:32px;
}
.footer__brand{
  display:flex;align-items:center;gap:12px;margin-bottom:14px;
}
.footer__brand .brand__logo{width:42px;height:42px;font-size:19px}
.footer__brand strong{font-size:18px;font-weight:700;display:block}
.footer__brand span:not(.brand__logo){font-size:13px;color:var(--color-text-muted);letter-spacing:.06em}
.footer__desc{
  color:var(--color-text-muted);font-size:14px;line-height:1.8;
  max-width:640px;margin-bottom:40px;
}
.footer__grid{
  display:grid;grid-template-columns:repeat(4,1fr);gap:32px;
  margin-bottom:48px;
}
.footer__col h4{font-size:15px;font-weight:600;margin-bottom:16px;color:var(--color-text)}
.footer__col li{margin-bottom:10px}
.footer__col a{font-size:14px;color:var(--color-text-secondary);transition:color .2s ease}
.footer__col a:hover{color:var(--color-accent)}
.footer__col a:focus-visible{outline:2px solid var(--color-accent);outline-offset:2px;border-radius:4px}
.footer__bottom{
  display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:10px;
  border-top:1px solid rgba(148,163,184,.08);
  padding-top:24px;
}
.footer__bottom p{font-size:13px;color:var(--color-text-muted)}

/* ---------- 响应式 ---------- */
@media (max-width:1024px){
  :root{--space-section:72px}
  .hero{padding:90px 0 72px}
  .hero__inner{grid-template-columns:1fr;gap:36px}
  .hero__stats{max-width:480px;justify-content:flex-start}
  .topics__grid{grid-template-columns:repeat(2,1fr)}
  .topic-grid__row-3{grid-template-columns:repeat(2,1fr)}
  .topic-grid__row-3 .topic-card:last-child{grid-column:1/-1;max-width:480px;margin:0 auto;width:100%}
}
@media (max-width:768px){
  :root{--space-section:56px}
  .container{padding:0 16px}
  .topbar__inner{height:56px}
  .topbar__actions{display:none}
  .nav__inner{flex-wrap:wrap;padding:8px 0}
  .nav__list{
    display:none;width:100%;
    flex-direction:column;align-items:flex-start;
    gap:2px;padding:10px 0;
    border-top:1px solid rgba(148,163,184,.1);
  }
  .nav__list.is-open{display:flex}
  .nav__link{width:100%;border-radius:10px}
  .nav__link.is-active::after{display:none}
  .nav__link.is-active{background:rgba(0,212,255,.08);color:var(--color-accent)}
  .nav__cta{display:none}
  .nav__toggle{
    display:inline-flex;align-items:center;justify-content:center;
    width:40px;height:40px;border-radius:10px;
    background:rgba(255,255,255,.04);border:1px solid rgba(148,163,184,.2);
    color:var(--color-text);font-size:20px;
    margin-left:auto;
    transition:border-color .2s ease;
  }
  .nav__toggle:hover{border-color:var(--color-accent)}
  .nav__toggle:focus-visible{outline:2px solid var(--color-accent);outline-offset:2px}
  .hero{padding:60px 0 48px}
  .hero__actions .btn--primary,.hero__actions .btn--secondary{width:100%}
  .hero__stats{padding:24px 16px;gap:16px}
  .hero__stat-num{font-size:30px}
  .topic-grid__row-2,.topic-grid__row-3{grid-template-columns:1fr}
  .topic-grid__row-3 .topic-card:last-child{grid-column:auto;max-width:none}
  .topics__grid{grid-template-columns:1fr}
  .featured__content{padding:28px}
  .section__head h2{font-size:22px}
  .newsletter__card{padding:36px 20px}
  .newsletter__form input{width:100%}
  .footer{padding:44px 16px 20px}
  .footer__grid{grid-template-columns:repeat(2,1fr);gap:24px}
  .footer__bottom{flex-direction:column;text-align:center}
}
@media (max-width:520px){
  .hero__content h1{font-size:30px}
  .footer__grid{grid-template-columns:1fr}
  .topic-card__body{padding:16px 18px 20px}
  .final-cta__card{padding:48px 20px}
}

/* roulang page: category4 */
:root {
      --bg-primary: #0B1220;
      --bg-secondary: #111C2E;
      --bg-card: rgba(15, 24, 40, .88);
      --bg-glass: rgba(18, 29, 51, .62);
      --brand-blue: #1677FF;
      --brand-cyan: #00A9EE;
      --accent: #00D4FF;
      --amber: #F5A524;
      --success: #12B76A;
      --error: #F04438;
      --text-main: #EAF0F8;
      --text-sub: #A3B3CC;
      --text-weak: #6B7E9E;
      --border-main: rgba(234, 240, 248, .12);
      --border-light: rgba(148, 163, 184, .15);
      --radius-lg: 16px;
      --radius-md: 10px;
      --radius-pill: 999px;
      --shadow-card: 0 18px 40px rgba(3, 8, 18, .45);
      --shadow-btn: 0 8px 24px rgba(0, 169, 238, .32);
      --font-main: "Source Han Sans SC", "PingFang SC", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;
      --font-mono: "JetBrains Mono", "Roboto Mono", "SFMono-Regular", Consolas, monospace;
      --spacer: 96px;
    }

    *,
    *::before,
    *::after {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }

    html {
      scroll-behavior: smooth;
    }

    body {
      font-family: var(--font-main);
      font-size: 16px;
      line-height: 1.75;
      color: var(--text-main);
      background: var(--bg-primary);
      -webkit-font-smoothing: antialiased;
    }

    a {
      color: inherit;
      text-decoration: none;
    }

    img {
      max-width: 100%;
      display: block;
    }

    button {
      font-family: inherit;
      cursor: pointer;
      border: none;
      background: none;
      color: inherit;
    }

    input,
    textarea {
      font-family: inherit;
    }

    ul,
    ol {
      list-style: none;
    }

    .container {
      max-width: 1200px;
      margin: 0 auto;
      padding: 0 24px;
    }

    .header {
      position: sticky;
      top: 0;
      z-index: 100;
      background: rgba(6, 12, 22, .88);
      backdrop-filter: blur(14px);
      -webkit-backdrop-filter: blur(14px);
      border-bottom: 1px solid var(--border-light);
    }

    .header__top {
      display: flex;
      align-items: center;
      justify-content: space-between;
      min-height: 64px;
    }

    .brand {
      display: flex;
      align-items: center;
      gap: 12px;
    }

    .brand__logo {
      width: 42px;
      height: 42px;
      border-radius: 10px;
      background: linear-gradient(135deg, var(--brand-blue), var(--brand-cyan));
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 800;
      font-family: var(--font-mono);
      color: #fff;
      font-size: 15px;
      letter-spacing: .02em;
      box-shadow: 0 6px 18px rgba(0, 169, 238, .3);
      flex-shrink: 0;
    }

    .brand__text {
      display: flex;
      flex-direction: column;
      line-height: 1.2;
    }

    .brand__text strong {
      font-size: 18px;
      font-weight: 700;
      letter-spacing: .03em;
    }

    .brand__text span {
      font-size: 12px;
      color: var(--text-sub);
      letter-spacing: .08em;
    }

    .header__actions {
      display: flex;
      align-items: center;
      gap: 12px;
    }

    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      padding: 12px 28px;
      border-radius: var(--radius-md);
      font-size: 16px;
      font-weight: 600;
      transition: all .2s ease;
      border: 1px solid transparent;
    }

    .btn:focus-visible {
      outline: 2px solid var(--accent);
      outline-offset: 2px;
    }

    .btn--glass {
      background: rgba(255, 255, 255, .06);
      border-color: rgba(234, 240, 248, .2);
      color: var(--text-main);
      padding: 8px 18px;
      font-size: 14px;
      border-radius: var(--radius-pill);
      font-weight: 500;
    }

    .btn--glass:hover {
      background: rgba(0, 212, 255, .1);
      border-color: var(--accent);
      color: var(--accent);
    }

    .btn--primary {
      background: linear-gradient(135deg, var(--brand-blue), var(--brand-cyan));
      color: #fff;
      box-shadow: var(--shadow-btn);
    }

    .btn--primary:hover {
      filter: brightness(1.1);
      box-shadow: 0 10px 32px rgba(0, 169, 238, .42);
      transform: translateY(-1px);
    }

    .btn--primary:active {
      transform: translateY(1px);
    }

    .btn--outline {
      background: transparent;
      border-color: rgba(234, 240, 248, .4);
      color: var(--text-main);
    }

    .btn--outline:hover {
      background: rgba(255, 255, 255, .08);
      border-color: var(--accent);
      color: var(--accent);
    }

    .nav {
      border-top: 1px solid rgba(148, 163, 184, .08);
    }

    .nav__inner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      min-height: 48px;
    }

    .nav__list {
      display: flex;
      align-items: center;
      gap: 4px;
    }

    .nav__link {
      display: inline-flex;
      align-items: center;
      padding: 8px 16px;
      border-radius: var(--radius-pill);
      font-size: 15px;
      font-weight: 500;
      color: var(--text-sub);
      transition: all .2s ease;
      position: relative;
    }

    .nav__link:hover {
      color: var(--accent);
      background: rgba(0, 212, 255, .08);
    }

    .nav__link.is-active {
      color: var(--accent);
    }

    .nav__link.is-active::after {
      content: "";
      position: absolute;
      left: 16px;
      right: 16px;
      bottom: 2px;
      height: 2px;
      background: var(--accent);
      border-radius: 2px;
    }

    .btn--nav {
      display: inline-flex;
      align-items: center;
      padding: 8px 20px;
      border-radius: var(--radius-pill);
      background: linear-gradient(135deg, var(--brand-blue), var(--brand-cyan));
      color: #fff;
      font-size: 14px;
      font-weight: 600;
      box-shadow: 0 6px 18px rgba(0, 169, 238, .28);
      transition: all .2s ease;
    }

    .btn--nav:hover {
      filter: brightness(1.1);
      box-shadow: 0 8px 24px rgba(0, 169, 238, .4);
      transform: translateY(-1px);
    }

    .nav__toggle {
      display: none;
      flex-direction: column;
      gap: 5px;
      width: 40px;
      height: 40px;
      align-items: center;
      justify-content: center;
      border-radius: 8px;
      border: 1px solid var(--border-light);
      transition: border-color .2s ease;
    }

    .nav__toggle:hover {
      border-color: var(--accent);
    }

    .nav__toggle span {
      display: block;
      width: 18px;
      height: 2px;
      background: var(--text-main);
      border-radius: 2px;
      transition: background .2s ease;
    }

    .nav__overlay {
      display: none;
      position: fixed;
      inset: 0;
      background: rgba(0, 0, 0, .55);
      z-index: 250;
      opacity: 0;
      transition: opacity .25s ease;
    }

    .nav__overlay.is-visible {
      display: block;
      opacity: 1;
    }

    .help-hero {
      position: relative;
      padding: 72px 0 88px;
      background: linear-gradient(135deg, rgba(11, 18, 32, .88), rgba(17, 28, 46, .72)), url('/assets/images/backpic/back-1.webp') center/cover no-repeat;
      border-bottom: 1px solid var(--border-light);
      overflow: hidden;
    }

    .help-hero::before {
      content: "";
      position: absolute;
      top: -80px;
      right: -80px;
      width: 360px;
      height: 360px;
      background: radial-gradient(circle, rgba(22, 119, 255, .3), transparent 70%);
      pointer-events: none;
    }

    .help-hero__inner {
      display: grid;
      grid-template-columns: 1.08fr .92fr;
      gap: 60px;
      align-items: center;
      position: relative;
      z-index: 1;
    }

    .help-hero__badge {
      display: inline-flex;
      align-items: center;
      padding: 6px 14px;
      border-radius: var(--radius-pill);
      background: rgba(0, 212, 255, .12);
      color: var(--accent);
      font-size: 13px;
      font-weight: 500;
      margin-bottom: 20px;
      border: 1px solid rgba(0, 212, 255, .22);
      letter-spacing: .05em;
    }

    .help-hero h1 {
      font-size: clamp(32px, 5vw, 46px);
      font-weight: 800;
      line-height: 1.2;
      letter-spacing: .03em;
      margin-bottom: 16px;
    }

    .help-hero__intro {
      font-size: 17px;
      color: var(--text-sub);
      max-width: 560px;
      line-height: 1.75;
    }

    .help-hero__stats {
      display: flex;
      gap: 36px;
      margin-top: 36px;
      flex-wrap: wrap;
    }

    .help-hero__stat {
      display: flex;
      flex-direction: column;
      gap: 2px;
      padding-right: 36px;
      border-right: 1px solid rgba(148, 163, 184, .18);
    }

    .help-hero__stat:last-child {
      border-right: none;
    }

    .help-hero__stat-num {
      font-family: var(--font-mono);
      font-size: 28px;
      font-weight: 700;
      color: var(--accent);
      line-height: 1.2;
    }

    .help-hero__stat-text {
      font-size: 13px;
      color: var(--text-sub);
      letter-spacing: .02em;
    }

    .help-hero__visual {
      position: relative;
    }

    .help-hero__img-wrap {
      border-radius: 20px;
      overflow: hidden;
      border: 1px solid rgba(0, 212, 255, .28);
      box-shadow: 0 24px 60px rgba(3, 8, 18, .5);
    }

    .help-hero__img-wrap img {
      width: 100%;
      height: 340px;
      object-fit: cover;
    }

    .help-hero__float-card {
      position: absolute;
      left: -20px;
      bottom: 24px;
      display: flex;
      align-items: center;
      gap: 12px;
      background: rgba(18, 29, 51, .88);
      backdrop-filter: blur(14px);
      -webkit-backdrop-filter: blur(14px);
      border: 1px solid rgba(0, 212, 255, .3);
      border-radius: 12px;
      padding: 12px 18px;
      box-shadow: 0 12px 32px rgba(0, 0, 0, .35);
    }

    .help-hero__float-icon {
      width: 34px;
      height: 34px;
      border-radius: 50%;
      background: linear-gradient(135deg, var(--brand-blue), var(--brand-cyan));
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 15px;
      color: #fff;
      flex-shrink: 0;
    }

    .help-hero__float-card strong {
      font-size: 14px;
      display: block;
      line-height: 1.3;
    }

    .help-hero__float-card span:last-child {
      font-size: 12px;
      color: var(--text-sub);
    }

    .help-main {
      padding: 72px 0 56px;
      background: var(--bg-primary);
    }

    .help-layout {
      display: grid;
      grid-template-columns: 260px 1fr;
      gap: 48px;
      align-items: start;
    }

    .help-sidebar {
      position: sticky;
      top: 132px;
      display: flex;
      flex-direction: column;
      gap: 8px;
      background: var(--bg-card);
      border: 1px solid var(--border-light);
      border-radius: var(--radius-lg);
      padding: 24px 16px;
      box-shadow: var(--shadow-card);
    }

    .help-sidebar__title {
      font-size: 13px;
      font-weight: 600;
      color: var(--text-weak);
      letter-spacing: .1em;
      padding: 0 12px 14px;
      border-bottom: 1px solid var(--border-light);
      margin-bottom: 10px;
    }

    .help-sidebar__link {
      display: block;
      padding: 10px 16px;
      border-radius: var(--radius-pill);
      font-size: 14px;
      color: var(--text-sub);
      transition: all .2s ease;
      border: 1px solid transparent;
    }

    .help-sidebar__link:hover {
      color: var(--accent);
      background: rgba(0, 212, 255, .08);
    }

    .help-sidebar__link.is-active {
      background: linear-gradient(135deg, var(--brand-blue), var(--brand-cyan));
      color: #fff;
      font-weight: 600;
      box-shadow: 0 6px 16px rgba(0, 169, 238, .3);
      border-color: transparent;
    }

    .help-content {
      min-width: 0;
    }

    .help-search {
      position: relative;
      margin-bottom: 40px;
    }

    .help-search input {
      width: 100%;
      padding: 14px 20px 14px 46px;
      border-radius: var(--radius-md);
      background: var(--bg-card);
      border: 1px solid rgba(148, 163, 184, .25);
      color: var(--text-main);
      font-size: 15px;
      outline: none;
      transition: border-color .2s ease, box-shadow .2s ease;
    }

    .help-search input::placeholder {
      color: var(--text-weak);
    }

    .help-search input:focus {
      border-color: var(--accent);
      box-shadow: 0 0 0 3px rgba(0, 212, 255, .15);
    }

    .help-search__icon {
      position: absolute;
      left: 16px;
      top: 50%;
      transform: translateY(-50%);
      width: 18px;
      height: 18px;
      color: var(--text-weak);
      pointer-events: none;
    }

    .faq-group {
      margin-bottom: 52px;
      scroll-margin-top: 140px;
    }

    .faq-group__header {
      margin-bottom: 22px;
      display: flex;
      align-items: flex-start;
      gap: 14px;
    }

    .faq-group__icon {
      width: 38px;
      height: 38px;
      border-radius: 10px;
      background: rgba(0, 212, 255, .12);
      border: 1px solid rgba(0, 212, 255, .2);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 18px;
      color: var(--accent);
      flex-shrink: 0;
    }

    .faq-group__title {
      font-size: 22px;
      font-weight: 700;
      letter-spacing: .02em;
      line-height: 1.3;
    }

    .faq-group__desc {
      color: var(--text-sub);
      font-size: 14px;
      margin-top: 2px;
    }

    .faq-item {
      background: var(--bg-card);
      border: 1px solid var(--border-light);
      border-radius: var(--radius-md);
      margin-bottom: 12px;
      overflow: hidden;
      transition: border-color .25s ease, box-shadow .25s ease;
    }

    .faq-item:hover {
      border-color: rgba(0, 212, 255, .4);
    }

    .faq-item.open {
      border-color: rgba(0, 212, 255, .5);
      box-shadow: 0 12px 28px rgba(3, 8, 18, .35);
    }

    .faq-item__question {
      width: 100%;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 16px;
      padding: 18px 24px;
      text-align: left;
      font-size: 16px;
      font-weight: 600;
      color: var(--text-main);
      transition: color .2s ease;
    }

    .faq-item__question:hover {
      color: var(--accent);
    }

    .faq-item__icon {
      width: 22px;
      height: 22px;
      flex-shrink: 0;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      border-radius: 50%;
      border: 1px solid rgba(0, 212, 255, .4);
      color: var(--accent);
      font-size: 16px;
      font-weight: 400;
      transition: transform .25s ease, background .25s ease;
      line-height: 1;
    }

    .faq-item.open .faq-item__icon {
      transform: rotate(45deg);
      background: rgba(0, 212, 255, .12);
    }

    .faq-item__answer {
      display: none;
      padding: 16px 24px 20px;
      color: var(--text-sub);
      line-height: 1.8;
      font-size: 15px;
      border-top: 1px solid rgba(255, 255, 255, .04);
      background: rgba(255, 255, 255, .02);
    }

    .faq-item.open .faq-item__answer {
      display: block;
      animation: fadeIn .3s ease;
    }

    @keyframes fadeIn {
      from {
        opacity: 0;
        transform: translateY(4px);
      }
      to {
        opacity: 1;
        transform: translateY(0);
      }
    }

    .help-cta {
      padding: 72px 0 96px;
      background: var(--bg-secondary);
      border-top: 1px solid rgba(148, 163, 184, .08);
    }

    .help-cta__card {
      position: relative;
      border-radius: var(--radius-lg);
      padding: 56px 64px;
      background: linear-gradient(135deg, rgba(22, 119, 255, .18), rgba(0, 169, 238, .08)), var(--bg-glass);
      border: 1px solid rgba(0, 212, 255, .2);
      overflow: hidden;
      text-align: center;
      box-shadow: var(--shadow-card);
    }

    .help-cta__card::before {
      content: "";
      position: absolute;
      top: -100px;
      left: 50%;
      transform: translateX(-50%);
      width: 320px;
      height: 320px;
      background: radial-gradient(circle, rgba(22, 119, 255, .25), transparent 70%);
      pointer-events: none;
    }

    .help-cta__title {
      font-size: 28px;
      font-weight: 700;
      margin-bottom: 12px;
      letter-spacing: .02em;
      position: relative;
    }

    .help-cta__text {
      color: var(--text-sub);
      max-width: 520px;
      margin: 0 auto 32px;
      font-size: 15px;
      position: relative;
    }

    .help-cta__actions {
      display: flex;
      gap: 16px;
      justify-content: center;
      flex-wrap: wrap;
      position: relative;
    }

    .footer {
      background: rgba(4, 8, 15, .92);
      border-top: 1px solid rgba(148, 163, 184, .1);
      padding: 64px 24px 24px;
    }

    .footer__brand {
      display: flex;
      align-items: center;
      gap: 12px;
      margin-bottom: 16px;
    }

    .footer__brand strong {
      font-size: 18px;
      display: block;
    }

    .footer__brand span {
      color: var(--text-sub);
      font-size: 14px;
    }

    .footer__desc {
      color: var(--text-weak);
      font-size: 14px;
      max-width: 640px;
      margin-bottom: 40px;
    }

    .footer__grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 32px;
      padding-bottom: 40px;
      border-bottom: 1px solid rgba(148, 163, 184, .1);
    }

    .footer__col h4 {
      font-size: 14px;
      font-weight: 600;
      color: var(--text-main);
      margin-bottom: 12px;
    }

    .footer__col ul {
      display: flex;
      flex-direction: column;
      gap: 8px;
    }

    .footer__col a {
      font-size: 14px;
      color: var(--text-weak);
      transition: color .2s ease;
    }

    .footer__col a:hover {
      color: var(--accent);
    }

    .footer__bottom {
      display: flex;
      justify-content: center;
      gap: 24px;
      padding-top: 24px;
      font-size: 13px;
      color: var(--text-weak);
    }

    @media (max-width: 1024px) {
      .help-layout {
        grid-template-columns: 1fr;
      }

      .help-sidebar {
        position: static;
        flex-direction: row;
        flex-wrap: wrap;
        align-items: center;
        gap: 8px;
        padding: 16px;
      }

      .help-sidebar__title {
        width: 100%;
        padding-bottom: 10px;
        margin-bottom: 4px;
      }

      .help-sidebar__link {
        padding: 8px 14px;
        font-size: 13px;
      }

      .help-hero__inner {
        grid-template-columns: 1fr;
        gap: 40px;
      }

      .help-hero__visual {
        max-width: 520px;
      }
    }

    @media (max-width: 767px) {
      .container {
        padding: 0 16px;
      }

      .header__actions .btn--glass {
        display: none;
      }

      .nav__toggle {
        display: flex;
      }

      .nav__inner {
        flex-wrap: wrap;
        min-height: 52px;
      }

      .nav__list {
        display: none;
      }

      .nav__list.is-open {
        display: flex;
        position: fixed;
        top: 0;
        left: 0;
        bottom: 0;
        width: min(300px, 85vw);
        flex-direction: column;
        align-items: stretch;
        background: rgba(6, 12, 22, .97);
        backdrop-filter: blur(14px);
        -webkit-backdrop-filter: blur(14px);
        padding: 40px 24px;
        gap: 8px;
        z-index: 300;
        box-shadow: 4px 0 40px rgba(0, 0, 0, .5);
        overflow-y: auto;
        animation: slideIn .3s ease;
      }

      .nav__list.is-open .nav__link {
        font-size: 16px;
        padding: 12px 16px;
        border-radius: var(--radius-md);
      }

      .nav__cta {
        display: none;
      }

      .help-hero {
        padding: 48px 0 64px;
      }

      .help-hero__stats {
        gap: 16px;
        margin-top: 28px;
      }

      .help-hero__stat {
        padding-right: 16px;
      }

      .help-hero__visual {
        display: none;
      }

      .help-main {
        padding: 48px 0 40px;
      }

      .help-cta {
        padding: 48px 0 64px;
      }

      .help-cta__card {
        padding: 40px 24px;
      }

      .footer__grid {
        grid-template-columns: repeat(2, 1fr);
      }

      .footer__bottom {
        flex-direction: column;
        gap: 8px;
        text-align: center;
      }
    }

    @keyframes slideIn {
      from {
        transform: translateX(-100%);
      }
      to {
        transform: translateX(0);
      }
    }

    @media (max-width: 520px) {
      .help-hero h1 {
        font-size: 30px;
      }

      .help-hero__intro {
        font-size: 15px;
      }

      .help-hero__stat-num {
        font-size: 22px;
      }

      .faq-item__question {
        font-size: 15px;
        padding: 16px 18px;
      }

      .faq-item__answer {
        padding: 14px 18px 16px;
        font-size: 14px;
      }

      .faq-group__title {
        font-size: 20px;
      }

      .help-cta__actions .btn {
        width: 100%;
      }

      .footer__grid {
        grid-template-columns: 1fr;
        gap: 24px;
      }
    }