/* roulang page: index */
:root{
  --bg-900:#060A18;
  --bg-800:#0B1226;
  --brand:#3A6BFF;
  --brand-700:#2A50D6;
  --glow:#21E6C1;
  --glow-ink:#0E9C84;
  --ink-900:#101828;
  --ink-600:#475467;
  --ink-400:#98A2B3;
  --line:#E5E9F2;
  --line-soft:#EEF1F6;
  --paper:#FFFFFF;
  --paper-2:#F6F8FC;
  --amber:#FF7A3D;
  --danger:#FF6B6B;
  --r-lg:20px;
  --r-md:16px;
  --r-sm:12px;
  --shadow-1:0 1px 2px rgba(16,24,40,.04),0 8px 24px rgba(16,24,40,.06);
  --shadow-2:0 12px 32px rgba(16,24,40,.10);
  --shadow-dark:0 0 0 1px rgba(255,255,255,.10),0 18px 40px rgba(0,0,0,.35);
  --ease:cubic-bezier(.2,.7,.3,1);
  --t:220ms;
}
*{box-sizing:border-box;}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%;}
body{
  margin:0;
  font-family:"PingFang SC","HarmonyOS Sans SC","Source Han Sans SC","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",sans-serif;
  font-size:16px;
  line-height:1.85;
  color:var(--ink-900);
  background:var(--paper);
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block;}
a{color:inherit;text-decoration:none;}
button,input,select,textarea{font:inherit;color:inherit;}
h1,h2,h3,h4,p,ul,ol{margin:0;}
ul,ol{padding:0;list-style:none;}
.tabular{font-variant-numeric:tabular-nums;}
.container{width:100%;max-width:1200px;margin:0 auto;padding:0 20px;}
@media (min-width:768px){.container{padding:0 32px;}}
@media (min-width:1280px){.container{max-width:1280px;}}
section[id],div[id]{scroll-margin-top:88px;}

a:focus-visible,button:focus-visible,input:focus-visible,select:focus-visible,textarea:focus-visible,summary:focus-visible{
  outline:2px solid var(--brand);outline-offset:2px;border-radius:8px;
}
.dark a:focus-visible,.dark button:focus-visible,.dark input:focus-visible,.dark select:focus-visible,.dark textarea:focus-visible,.site-footer a:focus-visible{
  outline-color:var(--glow);
}

/* ---------- 按钮 ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  min-height:48px;padding:0 26px;border-radius:999px;border:1px solid transparent;
  font-size:15px;font-weight:600;letter-spacing:.01em;cursor:pointer;white-space:nowrap;
  transition:background var(--t) var(--ease),color var(--t) var(--ease),border-color var(--t) var(--ease),box-shadow var(--t) var(--ease),transform var(--t) var(--ease);
}
.btn-sm{min-height:40px;padding:0 20px;font-size:14px;}
.btn-primary{background:var(--brand);color:#fff;box-shadow:0 6px 18px rgba(58,107,255,.28);}
.btn-primary:hover{background:var(--brand-700);transform:translateY(-1px);box-shadow:0 8px 24px rgba(58,107,255,.35);}
.btn-primary:active{transform:translateY(0);box-shadow:0 4px 12px rgba(58,107,255,.3);}
.btn-glow{background:rgba(33,230,193,.16);color:#8FF3E1;border-color:rgba(33,230,193,.55);}
.btn-glow:hover{background:rgba(33,230,193,.22);box-shadow:0 0 24px rgba(33,230,193,.35);transform:translateY(-1px);}
.btn-ghost-dark{background:transparent;color:rgba(255,255,255,.9);border-color:rgba(255,255,255,.35);}
.btn-ghost-dark:hover{background:rgba(255,255,255,.08);border-color:rgba(255,255,255,.6);}
.btn-outline{background:#fff;color:var(--ink-900);border-color:var(--line);}
.btn-outline:hover{background:rgba(58,107,255,.06);border-color:var(--brand);color:var(--brand);}
.btn:disabled{opacity:.4;cursor:not-allowed;transform:none;box-shadow:none;}

/* ---------- 徽章 / 标签 ---------- */
.badge{
  display:inline-flex;align-items:center;gap:6px;height:26px;padding:0 12px;border-radius:999px;
  font-size:13px;line-height:1.5;font-weight:500;background:rgba(58,107,255,.08);color:var(--brand);
}
.tag{
  display:inline-flex;align-items:center;height:26px;padding:0 12px;border-radius:999px;
  font-size:13px;line-height:1.5;background:var(--paper-2);color:var(--ink-600);border:1px solid var(--line);
}
.glass-badge{
  display:inline-flex;align-items:center;gap:8px;height:34px;padding:0 16px;border-radius:999px;
  font-size:13px;color:rgba(255,255,255,.86);
  background:rgba(255,255,255,.08);border:1px solid rgba(255,255,255,.16);
  backdrop-filter:blur(16px);-webkit-backdrop-filter:blur(16px);
}
.glass-badge .dot{width:7px;height:7px;border-radius:50%;background:var(--glow);box-shadow:0 0 10px rgba(33,230,193,.8);}

/* ---------- 顶部导航 ---------- */
.site-header{
  position:sticky;top:0;z-index:50;background:#fff;border-bottom:1px solid #E9EDF5;
  transition:box-shadow var(--t) var(--ease);
}
.site-header.is-scrolled{box-shadow:0 4px 16px rgba(16,24,40,.08);}
.header-inner{display:flex;align-items:center;gap:20px;height:60px;}
@media (min-width:1024px){.header-inner{height:68px;gap:24px;}}
.brand{display:flex;align-items:center;gap:10px;flex:0 0 auto;}
.brand-mark{
  width:28px;height:28px;border-radius:9px;display:grid;place-items:center;
  background:linear-gradient(135deg,#3A6BFF,#1B3AA8);
  box-shadow:0 6px 16px rgba(58,107,255,.35);
}
.brand-copy{display:flex;flex-direction:column;line-height:1.25;}
.brand-copy strong{font-size:16px;font-weight:600;color:var(--ink-900);letter-spacing:.01em;}
@media (min-width:1024px){.brand-copy strong{font-size:17px;}}
.brand-copy small{font-size:12px;color:#667085;}
.main-nav{display:none;align-items:center;gap:28px;margin-left:auto;}
@media (min-width:1024px){.main-nav{display:flex;}}
.nav-link{
  position:relative;font-size:15px;color:var(--ink-600);padding:6px 0;
  transition:color var(--t) var(--ease),transform var(--t) var(--ease);
}
.nav-link:hover{color:var(--brand);transform:translateY(1px);}
.nav-link.is-active{color:var(--brand);font-weight:600;}
.nav-link.is-active::after{
  content:"";position:absolute;left:0;right:0;bottom:-2px;height:2px;border-radius:999px;background:var(--brand);
}
.header-tools{display:flex;align-items:center;gap:10px;margin-left:auto;}
@media (min-width:1024px){.header-tools{margin-left:0;}}
.nav-search{
  display:none;align-items:center;gap:8px;height:40px;padding:0 14px;border-radius:999px;
  background:#F2F5FA;border:1px solid var(--line);color:var(--ink-400);
  transition:border-color var(--t) var(--ease),box-shadow var(--t) var(--ease);
}
@media (min-width:1200px){.nav-search{display:flex;width:220px;}}
.nav-search:focus-within{border-color:var(--brand);box-shadow:0 0 0 3px rgba(58,107,255,.16);}
.nav-search input{border:0;background:transparent;outline:none;width:100%;font-size:14px;color:var(--ink-900);}
.nav-search input::placeholder{color:var(--ink-400);}
.nav-toggle{
  width:44px;height:44px;border:1px solid var(--line);border-radius:12px;background:#fff;
  display:flex;flex-direction:column;align-items:center;justify-content:center;gap:5px;cursor:pointer;
  transition:border-color var(--t) var(--ease),background var(--t) var(--ease);
}
.nav-toggle span{width:18px;height:2px;border-radius:2px;background:var(--ink-900);transition:transform var(--t) var(--ease);}
.nav-toggle:hover{border-color:var(--brand);background:rgba(58,107,255,.05);}
@media (min-width:1024px){.nav-toggle{display:none;}}
.mobile-drawer{
  border-top:1px solid var(--line);background:#fff;padding:16px 20px 24px;
  max-height:calc(100vh - 60px);overflow-y:auto;
}
.mobile-drawer[hidden]{display:none;}
.drawer-link{display:block;padding:14px 4px;font-size:15px;color:var(--ink-600);border-bottom:1px solid var(--line-soft);}
.drawer-link.is-active{color:var(--brand);font-weight:600;}
.drawer-search{
  display:flex;align-items:center;gap:8px;height:44px;padding:0 16px;border-radius:999px;
  background:#F2F5FA;border:1px solid var(--line);margin:16px 0;
}
.drawer-search input{border:0;background:transparent;outline:none;width:100%;font-size:14px;}
.drawer-cta{display:flex;flex-direction:column;gap:10px;margin-top:8px;}
.drawer-cta .btn{width:100%;}

/* ---------- Hero ---------- */
.hero{position:relative;overflow:hidden;background:var(--bg-900);isolation:isolate;min-height:480px;}
.hero-bg{position:absolute;inset:0;background-size:cover;background-position:center;opacity:.9;}
.hero-overlay{position:absolute;inset:0;background:linear-gradient(180deg,rgba(6,10,24,.55),rgba(6,10,24,.92));}
.hero-glow{
  position:absolute;width:460px;height:460px;border-radius:50%;top:-140px;right:-100px;
  background:radial-gradient(circle,rgba(33,230,193,.18),rgba(33,230,193,0) 70%);filter:blur(8px);
}
.hero::after{content:"";position:absolute;left:0;right:0;bottom:0;height:1px;background:rgba(255,255,255,.08);}
.hero-inner{position:relative;z-index:2;display:grid;gap:40px;padding-top:56px;padding-bottom:56px;}
@media (min-width:768px){
  .hero{min-height:540px;}
  .hero-inner{padding-top:72px;padding-bottom:72px;}
}
@media (min-width:1024px){
  .hero{min-height:620px;}
  .hero-inner{grid-template-columns:7fr 5fr;gap:56px;align-items:center;padding-top:88px;padding-bottom:88px;}
}
.hero-copy{color:#fff;}
.hero-copy h1{
  margin-top:20px;color:#fff;font-size:clamp(30px,4.6vw,52px);line-height:1.15;font-weight:700;letter-spacing:.01em;
}
.hero-sub{
  margin-top:18px;font-size:18px;line-height:1.8;color:rgba(255,255,255,.78);max-width:600px;
}
@media (min-width:768px){.hero-sub{font-size:19px;}}
.hero-actions{display:flex;flex-wrap:wrap;gap:14px;margin-top:32px;}
.hero-actions .btn{flex:1 1 100%;}
@media (min-width:520px){.hero-actions .btn{flex:0 0 auto;}}
.hero-stats{display:flex;flex-wrap:wrap;gap:24px;margin-top:40px;}
.hero-stats .stat{position:relative;padding-left:20px;}
.hero-stats .stat::before{content:"";position:absolute;left:0;top:8px;bottom:8px;width:2px;border-radius:2px;background:linear-gradient(180deg,var(--brand),var(--glow));}
.hero-stats .stat strong{display:block;font-size:24px;font-weight:700;color:#fff;font-variant-numeric:tabular-nums;letter-spacing:.02em;}
.hero-stats .stat span{display:block;font-size:13px;color:rgba(255,255,255,.62);line-height:1.6;}

.glass{
  background:rgba(255,255,255,.06);
  border:1px solid rgba(255,255,255,.14);
  backdrop-filter:blur(16px);
  -webkit-backdrop-filter:blur(16px);
  border-radius:var(--r-lg);
  box-shadow:var(--shadow-dark);
}
.hero-card{padding:24px;color:rgba(255,255,255,.86);}
.hero-card-head{display:flex;align-items:center;justify-content:space-between;gap:12px;}
.hero-card-head .badge{background:rgba(255,255,255,.10);color:rgba(255,255,255,.82);}
.status-ok{display:inline-flex;align-items:center;gap:6px;font-size:13px;color:#8FF3E1;}
.status-ok i{width:7px;height:7px;border-radius:50%;background:var(--glow);box-shadow:0 0 8px rgba(33,230,193,.9);}
.status-list{margin-top:20px;display:flex;flex-direction:column;gap:12px;}
.status-list li{display:flex;align-items:center;justify-content:space-between;font-size:15px;color:rgba(255,255,255,.78);border-bottom:1px dashed rgba(255,255,255,.12);padding-bottom:12px;}
.status-list li:last-child{border-bottom:0;padding-bottom:0;}
.status-list li b{color:#fff;font-weight:600;}
.progress-wrap{margin-top:20px;}
.progress-label{display:flex;align-items:center;justify-content:space-between;font-size:13px;color:rgba(255,255,255,.62);margin-bottom:8px;}
.progress{height:8px;border-radius:999px;background:rgba(255,255,255,.12);overflow:hidden;}
.progress i{display:block;height:100%;border-radius:999px;background:linear-gradient(90deg,var(--brand),var(--glow));box-shadow:0 0 14px rgba(33,230,193,.5);}
.hero-card-img{margin-top:22px;border-radius:var(--r-sm);width:100%;height:140px;object-fit:cover;}

/* ---------- 通用板块 ---------- */
.section{padding:56px 0;}
@media (min-width:768px){.section{padding:72px 0;}}
@media (min-width:1024px){.section{padding:96px 0;}}
.section-light{background:var(--paper);}
.section-soft{background:var(--paper-2);}
.section-dark{background:var(--bg-900);color:rgba(255,255,255,.86);}
.section-head{max-width:720px;}
.section-head .eyebrow{
  display:inline-block;font-size:13px;letter-spacing:.16em;color:var(--brand);font-weight:600;text-transform:uppercase;
}
.section-head h2{margin-top:12px;font-size:clamp(24px,2.6vw,34px);line-height:1.25;font-weight:600;color:var(--ink-900);letter-spacing:.01em;}
.section-head p{margin-top:14px;font-size:16px;color:var(--ink-600);}
.section-head-row{display:flex;flex-wrap:wrap;gap:20px;align-items:flex-end;justify-content:space-between;max-width:none;}
.section-dark .section-head h2{color:#fff;}
.section-dark .section-head p{color:rgba(255,255,255,.62);}
.section-dark .section-head .eyebrow{color:var(--glow);}
.head-gap{margin-bottom:36px;}
@media (min-width:1024px){.head-gap{margin-bottom:44px;}}
.link-arrow{
  display:inline-flex;align-items:center;gap:6px;font-size:15px;font-weight:600;color:var(--brand);
  transition:gap var(--t) var(--ease),color var(--t) var(--ease);
}
.link-arrow:hover{gap:12px;color:var(--brand-700);}

/* ---------- 时间线 ---------- */
.timeline{position:relative;margin-top:40px;padding-left:28px;}
.timeline::before{
  content:"";position:absolute;left:5px;top:8px;bottom:8px;width:4px;border-radius:4px;
  background:linear-gradient(180deg,#3A6BFF,#21E6C1,rgba(33,230,193,0));
}
.tl-item{position:relative;display:grid;gap:6px;padding-bottom:30px;}
.tl-item:last-child{padding-bottom:0;}
.tl-item::before{
  content:"";position:absolute;left:-28px;top:11px;width:12px;height:12px;border-radius:50%;
  background:#fff;border:3px solid var(--brand);box-shadow:0 0 0 4px rgba(58,107,255,.12);
}
.tl-item.is-first::before{background:var(--glow);border-color:var(--glow);box-shadow:0 0 0 4px rgba(33,230,193,.18);}
.tl-time{font-size:13px;font-weight:600;color:var(--brand);font-variant-numeric:tabular-nums;letter-spacing:.04em;}
.tl-item.is-first .tl-time{color:var(--glow-ink);}
.tl-body h3{font-size:20px;font-weight:600;line-height:1.45;color:var(--ink-900);}
.tl-body p{margin-top:8px;font-size:15px;color:var(--ink-600);max-width:660px;}
.tl-body .tag{margin-top:12px;}
@media (min-width:768px){
  .timeline{padding-left:34px;}
  .tl-item{padding-bottom:36px;grid-template-columns:120px 1fr;gap:20px;align-items:start;}
  .tl-item::before{left:-34px;top:12px;}
  .tl-body h3{font-size:21px;}
}

/* ---------- 要点卡片（不对称网格） ---------- */
.feature-grid{display:grid;gap:20px;margin-top:40px;}
@media (min-width:768px){.feature-grid{grid-template-columns:repeat(2,1fr);}}
@media (min-width:1024px){.feature-grid{grid-template-columns:repeat(4,1fr);grid-auto-rows:minmax(200px,auto);gap:24px;}}
.feature-card{
  background:#fff;border:1px solid var(--line);border-radius:var(--r-md);overflow:hidden;
  display:flex;flex-direction:column;box-shadow:var(--shadow-1);
  transition:transform var(--t) var(--ease),box-shadow var(--t) var(--ease),border-color var(--t) var(--ease);
}
.feature-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-2);border-color:#D8E0F0;}
.feature-card img{width:100%;height:160px;object-fit:cover;}
.feature-body{padding:20px;}
.feature-body h3{font-size:17px;font-weight:600;line-height:1.5;color:var(--ink-900);}
.feature-body p{margin-top:10px;font-size:14px;color:var(--ink-600);}
.feature-lg{grid-column:span 1;}
@media (min-width:1024px){
  .feature-lg{grid-column:span 2;grid-row:span 2;}
  .feature-lg img{height:260px;}
  .feature-lg .feature-body h3{font-size:22px;}
  .feature-lg .feature-body p{font-size:15px;max-width:520px;}
}

/* ---------- 入口对比（深色玻璃卡） ---------- */
.compare-grid{display:grid;gap:20px;margin-top:40px;}
@media (min-width:1024px){.compare-grid{grid-template-columns:repeat(3,1fr);gap:24px;align-items:stretch;}}
.compare-card{position:relative;padding:26px;display:flex;flex-direction:column;transition:box-shadow var(--t) var(--ease),transform var(--t) var(--ease);}
.compare-card:hover{transform:translateY(-4px);box-shadow:0 0 0 1px rgba(33,230,193,.45),0 0 32px rgba(33,230,193,.18),0 18px 40px rgba(0,0,0,.35);}
.compare-card h3{font-size:20px;font-weight:600;color:#fff;}
.compare-card .lead{margin-top:10px;font-size:14px;color:rgba(255,255,255,.62);}
.benefit-list{margin-top:22px;display:flex;flex-direction:column;gap:12px;flex:1;}
.benefit-list li{display:flex;align-items:flex-start;gap:10px;font-size:15px;line-height:1.7;color:rgba(255,255,255,.82);}
.benefit-list svg{flex:0 0 auto;margin-top:5px;}
.compare-card .btn{margin-top:26px;width:100%;}
.compare-card.is-featured{background:rgba(33,230,193,.07);border-color:rgba(33,230,193,.5);}
@media (min-width:1024px){.compare-card.is-featured{transform:scale(1.03);}}
.compare-card.is-featured:hover{transform:translateY(-4px) scale(1.03);}
.corner-flag{
  position:absolute;top:-12px;right:20px;height:26px;padding:0 12px;border-radius:999px;
  background:var(--amber);color:#fff;font-size:13px;font-weight:600;display:inline-flex;align-items:center;
  box-shadow:0 6px 16px rgba(255,122,61,.35);
}
.compare-foot{margin-top:24px;font-size:14px;color:rgba(255,255,255,.6);}
.compare-foot a{color:#8FF3E1;text-decoration:underline;text-underline-offset:3px;}
.compare-foot a:hover{color:var(--glow);}

/* ---------- 咨询表单 ---------- */
.consult-wrap{display:grid;gap:32px;margin-top:40px;}
@media (min-width:1024px){.consult-wrap{grid-template-columns:7fr 5fr;gap:48px;align-items:start;}}
.form-grid{display:grid;gap:18px;}
@media (min-width:640px){.form-grid{grid-template-columns:1fr 1fr;}}
.form-grid .full{grid-column:1 / -1;}
.field label{display:block;font-size:14px;color:rgba(255,255,255,.72);margin-bottom:8px;}
.field .req{color:var(--amber);margin-left:4px;}
.field input,.field select,.field textarea{
  width:100%;height:48px;padding:0 16px;border-radius:var(--r-sm);
  background:rgba(255,255,255,.06);border:1px solid rgba(255,255,255,.16);
  color:#fff;font-size:15px;outline:none;
  transition:border-color var(--t) var(--ease),box-shadow var(--t) var(--ease),background var(--t) var(--ease);
}
.field textarea{height:112px;padding:12px 16px;resize:vertical;line-height:1.7;}
.field select{appearance:none;background-image:url("data:image/svg+xml;charset=utf-8,%3Csvg xmlns='http://www.w3.org/2000/svg' width='14' height='14' viewBox='0 0 14 14'%3E%3Cpath d='M3 5l4 4 4-4' fill='none' stroke='%2398A2B3' stroke-width='1.6' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");background-repeat:no-repeat;background-position:right 16px center;}
.field select option{color:#101828;}
.field input::placeholder,.field textarea::placeholder{color:rgba(255,255,255,.4);}
.field input:focus,.field select:focus,.field textarea:focus{
  border-color:var(--glow);box-shadow:0 0 0 3px rgba(33,230,193,.18);background:rgba(255,255,255,.09);
}
.field .hint{margin-top:8px;font-size:13px;color:rgba(255,255,255,.5);}
.form-tip{margin-top:16px;font-size:14px;min-height:22px;}
.form-tip.is-ok{color:#8FF3E1;}
.form-tip.is-err{color:var(--danger);}
.notice-card{padding:26px;}
.notice-card h3{font-size:18px;font-weight:600;color:#fff;}
.notice-list{margin-top:20px;display:flex;flex-direction:column;gap:16px;}
.notice-list li{display:flex;gap:12px;font-size:15px;line-height:1.8;color:rgba(255,255,255,.78);}
.notice-list li strong{display:block;color:#fff;font-weight:600;font-size:15px;}
.notice-num{
  flex:0 0 auto;width:26px;height:26px;border-radius:8px;display:grid;place-items:center;
  background:rgba(33,230,193,.14);color:#8FF3E1;font-size:13px;font-weight:600;
}

/* ---------- 最新信息 ---------- */
.news-grid{display:grid;gap:16px;margin-top:36px;}
@media (min-width:768px){.news-grid{grid-template-columns:1fr 1fr;gap:20px 24px;}}
.news-row{
  display:flex;gap:16px;padding:14px;border-radius:var(--r-md);background:#fff;
  border:1px solid var(--line);transition:background var(--t) var(--ease),transform var(--t) var(--ease),box-shadow var(--t) var(--ease),border-color var(--t) var(--ease);
}
.news-row:hover{background:var(--paper-2);transform:translateY(-2px);box-shadow:var(--shadow-1);border-color:#D8E0F0;}
.news-thumb{
  flex:0 0 96px;width:96px;height:72px;border-radius:var(--r-sm);overflow:hidden;
  background:linear-gradient(135deg,#3A6BFF,#1B3AA8);
}
@media (min-width:768px){.news-thumb{flex:0 0 160px;width:160px;height:110px;}}
.news-thumb img{width:100%;height:100%;object-fit:cover;}
.news-body{min-width:0;display:flex;flex-direction:column;flex:1;}
.news-body h3{
  font-size:16px;font-weight:600;line-height:1.5;color:var(--ink-900);
  display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden;
}
@media (min-width:768px){.news-body h3{font-size:17px;}}
.news-sum{
  margin-top:8px;font-size:14px;color:var(--ink-600);
  display:-webkit-box;-webkit-line-clamp:1;-webkit-box-orient:vertical;overflow:hidden;
}
@media (min-width:768px){.news-sum{-webkit-line-clamp:2;font-size:15px;}}
.news-meta{display:flex;align-items:center;gap:12px;margin-top:auto;padding-top:12px;font-size:13px;color:var(--ink-400);}
.news-meta .arrow{color:var(--brand);transition:transform var(--t) var(--ease);margin-left:auto;}
.news-row:hover .arrow{transform:translateX(4px);}
.empty-state{
  margin-top:36px;padding:48px 24px;border:1px dashed var(--line);border-radius:var(--r-md);
  background:var(--paper-2);text-align:center;display:flex;flex-direction:column;align-items:center;gap:14px;
}
.empty-icon{
  width:52px;height:52px;border-radius:16px;display:grid;place-items:center;
  background:rgba(58,107,255,.08);color:var(--brand);
}
.empty-state p{font-size:15px;color:var(--ink-600);}

/* ---------- FAQ ---------- */
.faq-wrap{display:grid;gap:32px;}
@media (min-width:1024px){.faq-wrap{grid-template-columns:4fr 8fr;gap:56px;align-items:start;}}
.faq-list{display:flex;flex-direction:column;gap:12px;}
.faq-item{
  background:#fff;border:1px solid var(--line);border-radius:var(--r-sm);
  transition:border-color var(--t) var(--ease),box-shadow var(--t) var(--ease);
}
.faq-item:hover{border-color:var(--brand);}
.faq-item[open]{box-shadow:var(--shadow-1);}
.faq-item summary{
  list-style:none;cursor:pointer;padding:18px 52px 18px 20px;position:relative;
  font-size:16px;font-weight:600;color:var(--ink-900);line-height:1.6;
}
@media (min-width:768px){.faq-item summary{font-size:17px;}}
.faq-item summary::-webkit-details-marker{display:none;}
.faq-item summary::after{
  content:"";position:absolute;right:20px;top:50%;width:12px;height:12px;margin-top:-7px;
  border-right:2px solid var(--ink-400);border-bottom:2px solid var(--ink-400);
  transform:rotate(45deg);transition:transform var(--t) var(--ease),border-color var(--t) var(--ease);
}
.faq-item[open] summary::after{transform:rotate(-135deg);margin-top:-2px;border-color:var(--brand);}
.faq-answer{padding:0 20px 20px;font-size:15px;line-height:1.85;color:var(--ink-600);}
@media (min-width:768px){.faq-answer{font-size:16px;}}

/* ---------- 页脚 ---------- */
.site-footer{background:var(--bg-900);color:rgba(255,255,255,.6);border-top:1px solid rgba(255,255,255,.08);}
.footer-grid{display:grid;gap:32px;padding:56px 20px 40px;}
@media (min-width:768px){.footer-grid{grid-template-columns:1fr 1fr;padding:64px 32px 44px;gap:36px;}}
@media (min-width:1024px){.footer-grid{grid-template-columns:2fr 1fr 1fr 1fr;padding:72px 0 48px;gap:48px;}}
.brand-footer .brand-copy strong{color:#fff;}
.brand-footer .brand-copy small{color:rgba(255,255,255,.5);}
.footer-brand p{margin-top:18px;font-size:14px;line-height:1.9;color:rgba(255,255,255,.6);max-width:340px;}
.footer-contact{margin-top:14px;font-size:14px;color:rgba(255,255,255,.72);}
.footer-col h4{font-size:15px;font-weight:600;color:#fff;margin-bottom:16px;}
.footer-col ul{display:flex;flex-direction:column;gap:12px;}
.footer-col a{font-size:14px;color:rgba(255,255,255,.6);transition:color var(--t) var(--ease);}
.footer-col a:hover{color:var(--glow);}
.footer-bottom{border-top:1px solid rgba(255,255,255,.08);}
.footer-bottom-inner{
  display:flex;flex-wrap:wrap;gap:12px;align-items:center;justify-content:space-between;
  padding:20px 0;font-size:13px;color:rgba(255,255,255,.5);
}
.back-top{
  position:fixed;right:20px;bottom:24px;z-index:40;width:44px;height:44px;border-radius:50%;
  background:var(--bg-800);border:1px solid rgba(33,230,193,.5);color:#8FF3E1;font-size:13px;
  display:grid;place-items:center;cursor:pointer;opacity:0;visibility:hidden;
  transition:opacity var(--t) var(--ease),visibility var(--t) var(--ease),box-shadow var(--t) var(--ease);
}
.back-top.is-show{opacity:1;visibility:visible;}
.back-top:hover{box-shadow:0 0 24px rgba(33,230,193,.35);}

/* roulang page: article */
:root{
    --bg-900:#060A18;
    --bg-800:#0B1226;
    --brand:#3A6BFF;
    --brand-700:#2A50D6;
    --glow:#21E6C1;
    --glow-ink:#0E9C84;
    --ink-900:#101828;
    --ink-600:#475467;
    --ink-400:#98A2B3;
    --line:#E5E9F2;
    --line-soft:#EEF1F6;
    --paper:#FFFFFF;
    --paper-2:#F6F8FC;
    --amber:#FF7A3D;
    --danger:#FF6B6B;
    --r-lg:20px;
    --r-md:16px;
    --r-sm:12px;
    --sh-1:0 1px 2px rgba(16,24,40,.04), 0 8px 24px rgba(16,24,40,.06);
    --sh-2:0 12px 32px rgba(16,24,40,.10);
    --dur:200ms;
    --ease:cubic-bezier(.22,.61,.36,1);
    --font:"PingFang SC","HarmonyOS Sans SC","Source Han Sans SC","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",sans-serif;
  }

  *,*::before,*::after{box-sizing:border-box;}
  html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;}
  .site-body{
    margin:0;
    padding:0;
    font-family:var(--font);
    font-size:16px;
    line-height:1.8;
    color:var(--ink-900);
    background:var(--paper);
    -webkit-font-smoothing:antialiased;
    overflow-x:hidden;
  }
  .site-body img{max-width:100%;display:block;border:0;}
  .site-body a{color:inherit;text-decoration:none;}
  .site-body button{font-family:inherit;cursor:pointer;border:0;background:none;color:inherit;}
  .site-body input,.site-body select,.site-body textarea{font-family:inherit;font-size:15px;color:var(--ink-900);}

  .container{
    width:100%;
    max-width:1200px;
    margin:0 auto;
    padding-left:20px;
    padding-right:20px;
  }
  @media (min-width:768px){ .container{padding-left:32px;padding-right:32px;} }
  @media (min-width:1280px){ .container{max-width:1280px;} }

  :focus-visible{
    outline:2px solid var(--brand);
    outline-offset:2px;
    border-radius:6px;
  }
  .dark :focus-visible,
  .band-dark :focus-visible{
    outline-color:var(--glow);
  }

  /* ============ Header / Nav ============ */
  .site-header{
    position:sticky;
    top:0;
    z-index:50;
    background:#FFFFFF;
    border-bottom:1px solid #E9EDF5;
    transition:box-shadow var(--dur) var(--ease);
  }
  .site-header.is-scrolled{ box-shadow:0 4px 16px rgba(16,24,40,.08); }
  .header-inner{
    display:flex;
    align-items:center;
    gap:32px;
    min-height:68px;
  }
  .brand{
    display:inline-flex;
    align-items:center;
    gap:10px;
    flex-shrink:0;
  }
  .brand-mark{
    width:28px;
    height:28px;
    border-radius:9px;
    display:inline-flex;
    align-items:center;
    justify-content:center;
    background:linear-gradient(135deg,#3A6BFF 0%,#2A50D6 55%,#21E6C1 140%);
    box-shadow:0 4px 12px rgba(58,107,255,.32);
  }
  .brand-mark svg{width:18px;height:18px;}
  .brand-copy{display:flex;flex-direction:column;line-height:1.25;}
  .brand-copy strong{
    font-size:17px;
    font-weight:600;
    letter-spacing:.01em;
    color:#101828;
    white-space:nowrap;
  }
  .brand-copy small{
    font-size:12px;
    color:#667085;
    letter-spacing:.02em;
    white-space:nowrap;
  }
  .main-nav{
    display:flex;
    align-items:center;
    gap:30px;
    flex:1 1 auto;
    min-width:0;
  }
  .nav-link{
    position:relative;
    font-size:15px;
    line-height:1;
    padding:23px 0;
    color:var(--ink-600);
    white-space:nowrap;
    transition:color var(--dur) var(--ease),transform var(--dur) var(--ease);
  }
  .nav-link::after{
    content:"";
    position:absolute;
    left:0;
    right:0;
    bottom:16px;
    height:2px;
    border-radius:2px;
    background:var(--brand);
    transform:scaleX(0);
    transform-origin:center;
    transition:transform var(--dur) var(--ease);
  }
  .nav-link:hover{color:var(--brand);transform:translateY(1px);}
  .nav-link.is-active{color:var(--brand);font-weight:600;}
  .nav-link.is-active::after{transform:scaleX(1);}
  .header-tools{
    display:flex;
    align-items:center;
    gap:14px;
    flex-shrink:0;
  }
  .search-box{
    display:flex;
    align-items:center;
    gap:8px;
    height:40px;
    padding:0 16px;
    border-radius:999px;
    background:#F2F5FA;
    border:1px solid var(--line);
    transition:border-color var(--dur) var(--ease),box-shadow var(--dur) var(--ease),background var(--dur) var(--ease);
  }
  .search-box svg{width:16px;height:16px;flex-shrink:0;stroke:var(--ink-400);}
  .search-box input{
    width:150px;
    border:0;
    background:transparent;
    outline:none;
    font-size:14px;
    line-height:1;
  }
  .search-box input::placeholder{color:var(--ink-400);}
  .search-box:focus-within{
    background:#FFFFFF;
    border-color:var(--brand);
    box-shadow:0 0 0 3px rgba(58,107,255,.16);
  }

  .btn{
    display:inline-flex;
    align-items:center;
    justify-content:center;
    gap:8px;
    min-height:44px;
    padding:0 22px;
    border-radius:999px;
    font-size:15px;
    font-weight:600;
    letter-spacing:.01em;
    white-space:nowrap;
    transition:transform var(--dur) var(--ease),box-shadow var(--dur) var(--ease),background-color var(--dur) var(--ease),color var(--dur) var(--ease),border-color var(--dur) var(--ease);
  }
  .btn:active{transform:translateY(1px) scale(.995);}
  .btn-sm{min-height:40px;padding:0 20px;font-size:14px;}
  .btn-primary{
    background:var(--brand);
    color:#FFFFFF;
    box-shadow:0 2px 8px rgba(58,107,255,.24);
  }
  .btn-primary:hover{
    background:var(--brand-700);
    transform:translateY(-1px);
    box-shadow:0 8px 24px rgba(58,107,255,.35);
  }
  .btn-ghost{
    border:1px solid var(--line);
    color:var(--ink-900);
    background:#FFFFFF;
  }
  .btn-ghost:hover{
    border-color:var(--brand);
    color:var(--brand);
    background:rgba(58,107,255,.06);
  }
  .btn-outline{
    border:1px solid var(--brand);
    color:var(--brand);
    background:transparent;
  }
  .btn-outline:hover{background:rgba(58,107,255,.08);}
  .btn-glow{
    background:rgba(33,230,193,.14);
    color:#8FF7E5;
    border:1px solid rgba(33,230,193,.55);
    box-shadow:0 0 0 1px rgba(33,230,193,.12);
  }
  .btn-glow:hover{
    background:rgba(33,230,193,.22);
    transform:translateY(-1px);
    box-shadow:0 0 24px rgba(33,230,193,.35);
  }
  .btn[disabled],.btn.is-disabled{
    opacity:.4;
    cursor:not-allowed;
    transform:none;
    box-shadow:none;
  }

  /* ============ Breadcrumb + Badge ============ */
  .breadcrumb{
    display:flex;
    flex-wrap:wrap;
    align-items:center;
    gap:8px;
    font-size:13px;
    color:#667085;
    padding:20px 0 0;
  }
  .breadcrumb a{color:#667085;transition:color var(--dur) var(--ease);}
  .breadcrumb a:hover{color:var(--brand);}
  .breadcrumb .sep{color:var(--ink-400);}
  .breadcrumb .current{color:var(--ink-600);}

  .badge{
    display:inline-flex;
    align-items:center;
    gap:6px;
    height:26px;
    padding:0 12px;
    border-radius:999px;
    font-size:13px;
    line-height:1;
    background:rgba(58,107,255,.08);
    color:var(--brand);
    white-space:nowrap;
  }
  .badge-soft{
    background:var(--paper-2);
    color:var(--ink-600);
    border:1px solid var(--line);
  }
  .badge-dark{
    background:rgba(255,255,255,.10);
    color:rgba(255,255,255,.82);
  }

  /* ============ Article head ============ */
  .article-hero{
    position:relative;
    background:var(--paper-2);
    border-bottom:1px solid var(--line);
    overflow:hidden;
  }
  .article-hero::before{
    content:"";
    position:absolute;
    inset:0;
    background-image:
      linear-gradient(180deg,rgba(246,248,252,.86) 0%,rgba(246,248,252,.96) 62%,#FFFFFF 100%),
      url("/assets/images/backpic/back-2.png");
    background-size:cover;
    background-position:center 30%;
    opacity:.9;
  }
  .article-hero::after{
    content:"";
    position:absolute;
    inset:0;
    background-image:
      linear-gradient(rgba(16,24,40,.045) 1px,transparent 1px),
      linear-gradient(90deg,rgba(16,24,40,.045) 1px,transparent 1px);
    background-size:40px 40px;
    mask-image:linear-gradient(180deg,rgba(0,0,0,.5),transparent 82%);
    -webkit-mask-image:linear-gradient(180deg,rgba(0,0,0,.5),transparent 82%);
    pointer-events:none;
  }
  .article-hero > .container{position:relative;z-index:2;}
  .article-head{
    padding:26px 0 40px;
    max-width:900px;
  }
  .article-head h1{
    margin:18px 0 0;
    font-size:clamp(26px,3.4vw,38px);
    line-height:1.3;
    font-weight:700;
    letter-spacing:.01em;
    color:var(--ink-900);
  }
  .article-meta{
    display:flex;
    flex-wrap:wrap;
    align-items:center;
    gap:10px;
    margin-top:20px;
    font-size:14px;
    color:var(--ink-600);
  }
  .article-meta .dot{color:var(--line);}
  .num{font-variant-numeric:tabular-nums;letter-spacing:.02em;}

  /* ============ Layout ============ */
  .article-layout{
    display:grid;
    grid-template-columns:minmax(0,760px) 240px;
    gap:56px;
    justify-content:center;
    padding-top:52px;
    padding-bottom:64px;
  }
  .article-main{min-width:0;}

  /* ============ Prose ============ */
  .prose{
    font-size:17px;
    line-height:1.9;
    color:#1D2939;
    word-break:break-word;
  }
  .prose > *:first-child{margin-top:0;}
  .prose p{margin:0 0 1.4em;}
  .prose h2{
    position:relative;
    margin:44px 0 16px;
    padding-left:16px;
    font-size:clamp(21px,2.2vw,26px);
    line-height:1.4;
    font-weight:600;
    color:var(--ink-900);
    letter-spacing:.01em;
  }
  .prose h2::before{
    content:"";
    position:absolute;
    left:0;
    top:.28em;
    width:4px;
    height:1em;
    border-radius:2px;
    background:linear-gradient(180deg,var(--brand),var(--glow));
  }
  .prose h3{
    margin:32px 0 12px;
    font-size:20px;
    line-height:1.45;
    font-weight:600;
    color:var(--ink-900);
  }
  .prose h4{
    margin:24px 0 10px;
    font-size:17px;
    font-weight:600;
    color:var(--ink-900);
  }
  .prose ul,.prose ol{
    margin:0 0 1.4em;
    padding-left:1.4em;
  }
  .prose ul{list-style:none;padding-left:1.4em;}
  .prose ul > li{position:relative;margin:8px 0;}
  .prose ul > li::before{
    content:"";
    position:absolute;
    left:-1.1em;
    top:.72em;
    width:7px;
    height:7px;
    border-radius:2px;
    background:var(--glow-ink);
  }
  .prose ol{list-style:decimal;}
  .prose ol > li{margin:8px 0;padding-left:4px;}
  .prose ol > li::marker{color:var(--brand);font-weight:600;}
  .prose blockquote{
    margin:24px 0;
    padding:18px 22px;
    border-left:4px solid var(--glow);
    background:var(--paper-2);
    border-radius:0 var(--r-sm) var(--r-sm) 0;
    font-size:16px;
    color:var(--ink-600);
  }
  .prose blockquote p:last-child{margin-bottom:0;}
  .prose img{
    width:100%;
    height:auto;
    margin:26px 0 10px;
    border-radius:var(--r-md);
    box-shadow:var(--sh-1);
  }
  .prose figure{margin:26px 0;}
  .prose figcaption{
    margin-top:10px;
    font-size:13px;
    text-align:center;
    color:var(--ink-400);
  }
  .prose a{
    color:var(--brand);
    border-bottom:1px solid rgba(58,107,255,.35);
    transition:color var(--dur) var(--ease),border-color var(--dur) var(--ease);
  }
  .prose a:hover{color:var(--brand-700);border-color:var(--brand-700);}
  .prose strong{font-weight:600;color:var(--ink-900);}
  .prose code{
    padding:2px 6px;
    border-radius:6px;
    background:var(--paper-2);
    border:1px solid var(--line);
    font-size:14px;
    color:var(--brand-700);
  }
  .prose pre{
    margin:24px 0;
    padding:18px 20px;
    border-radius:var(--r-sm);
    background:var(--bg-800);
    color:rgba(255,255,255,.86);
    overflow-x:auto;
    font-size:14px;
    line-height:1.7;
  }
  .prose pre code{background:none;border:0;color:inherit;padding:0;}
  .prose .table-wrap{
    margin:24px 0;
    overflow-x:auto;
    border:1px solid var(--line);
    border-radius:var(--r-sm);
  }
  .prose table{
    width:100%;
    border-collapse:collapse;
    font-size:15px;
    min-width:520px;
  }
  .prose thead th{
    background:var(--paper-2);
    font-weight:600;
    text-align:left;
    color:var(--ink-900);
  }
  .prose th,.prose td{
    padding:12px 16px;
    border-bottom:1px solid var(--line-soft);
  }
  .prose tbody tr:nth-child(even){background:#FBFCFE;}
  .prose tbody tr:last-child td{border-bottom:0;}
  .prose hr{
    margin:36px 0;
    border:0;
    height:1px;
    background:var(--line);
  }

  /* ============ TOC ============ */
  .toc-aside{
    position:relative;
  }
  .toc-card{
    position:sticky;
    top:100px;
    padding:20px;
    border-radius:var(--r-md);
    border:1px solid var(--line);
    background:var(--paper-2);
  }
  .toc-card h2{
    margin:0 0 12px;
    font-size:14px;
    font-weight:600;
    letter-spacing:.04em;
    color:var(--ink-900);
  }
  .toc-list{
    list-style:none;
    margin:0;
    padding:0;
    border-left:2px solid var(--line);
  }
  .toc-list li{margin:0;}
  .toc-list a{
    display:block;
    padding:7px 0 7px 14px;
    margin-left:-2px;
    border-left:2px solid transparent;
    font-size:14px;
    line-height:1.55;
    color:var(--ink-600);
    transition:color var(--dur) var(--ease),border-color var(--dur) var(--ease),background-color var(--dur) var(--ease);
  }
  .toc-list a:hover{color:var(--brand);}
  .toc-list a.is-current{
    color:var(--brand);
    border-left-color:var(--brand);
    font-weight:600;
    background:rgba(58,107,255,.06);
    border-radius:0 8px 8px 0;
  }
  .toc-mobile{display:none;}

  /* ============ Empty state ============ */
  .empty-state{
    padding:56px 24px;
    text-align:center;
    border:1px dashed var(--line);
    border-radius:var(--r-lg);
    background:var(--paper-2);
  }
  .empty-state .icon{
    width:52px;
    height:52px;
    margin:0 auto 16px;
    border-radius:14px;
    display:flex;
    align-items:center;
    justify-content:center;
    background:rgba(58,107,255,.10);
    color:var(--brand);
  }
  .empty-state h2{
    margin:0 0 8px;
    font-size:20px;
    font-weight:600;
    color:var(--ink-900);
  }
  .empty-state p{
    margin:0 0 20px;
    font-size:15px;
    color:var(--ink-600);
  }

  /* ============ Back actions ============ */
  .back-actions{
    display:flex;
    flex-wrap:wrap;
    gap:12px;
    margin-top:40px;
    padding-top:28px;
    border-top:1px solid var(--line);
  }

  /* ============ Related ============ */
  .related-section{
    margin-top:56px;
    padding-top:40px;
    border-top:1px solid var(--line);
  }
  .section-head{
    display:flex;
    align-items:flex-end;
    justify-content:space-between;
    gap:20px;
    margin-bottom:24px;
  }
  .section-head h2{
    margin:0;
    font-size:clamp(20px,2.2vw,24px);
    font-weight:600;
    line-height:1.35;
    color:var(--ink-900);
  }
  .section-head p{
    margin:6px 0 0;
    font-size:14px;
    color:var(--ink-600);
  }
  .text-link{
    font-size:14px;
    font-weight:600;
    color:var(--brand);
    border-bottom:1px solid rgba(58,107,255,.4);
    transition:color var(--dur) var(--ease),border-color var(--dur) var(--ease);
  }
  .text-link:hover{color:var(--brand-700);border-color:var(--brand-700);}
  .related-grid{
    display:grid;
    grid-template-columns:repeat(3,minmax(0,1fr));
    gap:20px;
  }
  .related-card{
    display:flex;
    flex-direction:column;
    border-radius:var(--r-md);
    border:1px solid var(--line);
    background:#FFFFFF;
    overflow:hidden;
    transition:transform var(--dur) var(--ease),box-shadow var(--dur) var(--ease),border-color var(--dur) var(--ease);
  }
  .related-card:hover{
    transform:translateY(-4px);
    box-shadow:var(--sh-2);
    border-color:rgba(58,107,255,.35);
  }
  .related-card .thumb{
    position:relative;
    aspect-ratio:16/9;
    background:linear-gradient(135deg,#3A6BFF,#0B1226);
    overflow:hidden;
  }
  .related-card .thumb img{
    width:100%;
    height:100%;
    object-fit:cover;
    transition:transform 420ms var(--ease);
  }
  .related-card:hover .thumb img{transform:scale(1.05);}
  .related-card .body{padding:16px 18px 18px;}
  .related-card h3{
    margin:0 0 10px;
    font-size:16px;
    line-height:1.5;
    font-weight:600;
    color:var(--ink-900);
    display:-webkit-box;
    -webkit-line-clamp:2;
    -webkit-box-orient:vertical;
    overflow:hidden;
  }
  .related-card .meta{
    display:flex;
    align-items:center;
    gap:10px;
    font-size:13px;
    color:var(--ink-400);
  }

  /* ============ CTA band ============ */
  .cta-band{
    background:var(--bg-900);
    border-top:1px solid rgba(255,255,255,.08);
    border-bottom:1px solid rgba(255,255,255,.08);
    padding:56px 0;
  }
  .cta-inner{
    display:grid;
    grid-template-columns:1.4fr 1fr;
    gap:32px;
    align-items:center;
  }
  .cta-inner h2{
    margin:0 0 10px;
    font-size:clamp(22px,2.6vw,30px);
    line-height:1.35;
    font-weight:600;
    color:#FFFFFF;
  }
  .cta-inner p{
    margin:0;
    font-size:15px;
    line-height:1.8;
    color:rgba(255,255,255,.66);
  }
  .cta-actions{
    display:flex;
    flex-wrap:wrap;
    gap:12px;
    justify-content:flex-end;
  }

  /* ============ Footer ============ */
  .site-footer{
    background:var(--bg-900);
    color:rgba(255,255,255,.6);
    padding-top:56px;
    border-top:1px solid rgba(255,255,255,.08);
  }
  .footer-grid{
    display:grid;
    grid-template-columns:1.5fr 1fr 1fr 1fr;
    gap:40px;
    padding-bottom:44px;
  }
  .footer-brand p{
    margin:16px 0 0;
    font-size:14px;
    line-height:1.85;
    color:rgba(255,255,255,.6);
    max-width:320px;
  }
  .footer-contact{margin-top:12px !important;color:rgba(255,255,255,.5) !important;}
  .brand-footer .brand-copy strong{color:#FFFFFF;}
  .brand-footer .brand-copy small{color:rgba(255,255,255,.55);}
  .brand-footer .brand-mark{box-shadow:0 4px 14px rgba(33,230,193,.22);}
  .footer-col h4{
    margin:0 0 16px;
    font-size:15px;
    font-weight:600;
    color:#FFFFFF;
  }
  .footer-col ul{list-style:none;margin:0;padding:0;}
  .footer-col li{margin:0 0 10px;}
  .footer-col a{
    font-size:14px;
    color:rgba(255,255,255,.6);
    transition:color var(--dur) var(--ease);
  }
  .footer-col a:hover{color:var(--glow);}
  .footer-bottom{
    border-top:1px solid rgba(255,255,255,.08);
    padding:20px 0;
  }
  .footer-bottom-inner{
    display:flex;
    flex-wrap:wrap;
    align-items:center;
    justify-content:space-between;
    gap:10px;
  }
  .footer-bottom-inner p{
    margin:0;
    font-size:13px;
    color:rgba(255,255,255,.48);
  }

  /* ============ Back to top ============ */
  .to-top{
    position:fixed;
    right:24px;
    bottom:24px;
    z-index:60;
    width:44px;
    height:44px;
    border-radius:50%;
    background:var(--bg-800);
    border:1px solid rgba(33,230,193,.55);
    color:#8FF7E5;
    display:flex;
    align-items:center;
    justify-content:center;
    opacity:0;
    visibility:hidden;
    transform:translateY(8px);
    transition:opacity var(--dur) var(--ease),transform var(--dur) var(--ease),visibility var(--dur) var(--ease),box-shadow var(--dur) var(--ease);
  }
  .to-top.is-visible{opacity:1;visibility:visible;transform:translateY(0);}
  .to-top:hover{box-shadow:0 0 24px rgba(33,230,193,.35);}

  /* ============ Responsive ============ */
  @media (max-width:1180px){
    .search-box input{width:110px;}
    .nav-link{gap:0;}
    .main-nav{gap:22px;}
  }
  @media (max-width:1023px){
    .header-inner{
      flex-wrap:wrap;
      gap:12px;
      padding-top:10px;
      padding-bottom:10px;
      min-height:60px;
    }
    .main-nav{
      order:3;
      flex:1 0 100%;
      gap:20px;
      overflow-x:auto;
      scrollbar-width:none;
      -webkit-overflow-scrolling:touch;
    }
    .main-nav::-webkit-scrollbar{display:none;}
    .nav-link{padding:12px 0;font-size:14px;}
    .nav-link::after{bottom:6px;}
    .search-box{display:none;}
    .article-layout{
      grid-template-columns:minmax(0,1fr);
      gap:0;
      padding-top:32px;
      padding-bottom:48px;
    }
    .toc-aside{display:none;}
    .toc-mobile{
      display:block;
      margin-bottom:24px;
      border:1px solid var(--line);
      border-radius:var(--r-sm);
      background:var(--paper-2);
      padding:12px 16px;
    }
    .toc-mobile summary{
      cursor:pointer;
      font-size:14px;
      font-weight:600;
      color:var(--ink-900);
      list-style:none;
    }
    .toc-mobile summary::-webkit-details-marker{display:none;}
    .toc-mobile .toc-list{margin-top:12px;border-left-color:var(--line-soft);}
    .related-grid{grid-template-columns:repeat(2,minmax(0,1fr));}
    .cta-inner{grid-template-columns:1fr;gap:24px;}
    .cta-actions{justify-content:flex-start;}
    .footer-grid{grid-template-columns:1fr 1fr;gap:32px;}
  }
  @media (max-width:767px){
    .article-head{padding:18px 0 30px;}
    .prose{font-size:16px;line-height:1.85;}
    .prose h2{margin-top:34px;}
    .related-grid{grid-template-columns:minmax(0,1fr);}
    .site-footer{padding-top:44px;}
    .footer-grid{grid-template-columns:1fr;gap:28px;}
    .footer-bottom-inner{flex-direction:column;align-items:flex-start;}
    .cta-band{padding:44px 0;}
    .cta-actions{flex-direction:column;align-items:stretch;}
    .cta-actions .btn{width:100%;}
    .to-top{right:16px;bottom:16px;}
  }
  @media (max-width:520px){
    .brand-copy small{display:none;}
    .brand-copy strong{font-size:16px;}
    .article-meta{font-size:13px;gap:8px;}
  }

/* roulang page: category1 */
:root{
  --bg-900:#060A18;
  --bg-800:#0B1226;
  --brand:#3A6BFF;
  --brand-700:#2A50D6;
  --glow:#21E6C1;
  --glow-ink:#0E9C84;
  --ink-900:#101828;
  --ink-600:#475467;
  --ink-400:#98A2B3;
  --line:#E5E9F2;
  --line-2:#EEF1F6;
  --paper:#FFFFFF;
  --paper-2:#F6F8FC;
  --amber:#FF7A3D;
  --danger:#FF6B6B;
  --r-xl:20px;
  --r-lg:16px;
  --r-sm:12px;
  --sh-1:0 1px 2px rgba(16,24,40,.04),0 8px 24px rgba(16,24,40,.06);
  --sh-2:0 12px 32px rgba(16,24,40,.10);
  --sh-glass:0 0 0 1px rgba(255,255,255,.10),0 18px 40px rgba(0,0,0,.35);
  --ease:cubic-bezier(.22,.61,.36,1);
  --header-h:68px;
}
*,*::before,*::after{box-sizing:border-box;}
html{scroll-behavior:smooth;}
body{
  margin:0;
  font-family:"PingFang SC","HarmonyOS Sans SC","Source Han Sans SC","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",sans-serif;
  font-size:16px;
  line-height:1.85;
  color:var(--ink-900);
  background:var(--paper);
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block;}
a{color:inherit;text-decoration:none;}
button{font-family:inherit;}
h1,h2,h3,h4,p,ul,ol,li{margin:0;padding:0;}
ul,ol{list-style:none;}
.container{width:100%;max-width:1200px;margin:0 auto;padding:0 20px;}
@media (min-width:768px){.container{padding:0 32px;}}
@media (min-width:1280px){.container{max-width:1280px;}}
:focus-visible{outline:2px solid var(--brand);outline-offset:2px;border-radius:4px;}
.dark :focus-visible,.cat-hero :focus-visible,.cta-band :focus-visible,.site-footer :focus-visible{outline-color:var(--glow);}

/* ---------- Header ---------- */
.site-header{
  position:sticky;top:0;z-index:50;
  background:#FFFFFF;
  border-bottom:1px solid #E9EDF5;
  transition:box-shadow .22s var(--ease);
}
.site-header.is-scrolled{box-shadow:0 4px 16px rgba(16,24,40,.08);}
.header-inner{
  display:flex;align-items:center;gap:20px;
  min-height:var(--header-h);
}
.brand{display:flex;align-items:center;gap:10px;flex-shrink:0;}
.brand-mark{
  width:28px;height:28px;border-radius:9px;
  display:inline-flex;align-items:center;justify-content:center;
  background:linear-gradient(135deg,#4C7BFF 0%,#2A50D6 100%);
  box-shadow:0 4px 12px rgba(58,107,255,.28);
}
.brand-copy{display:flex;flex-direction:column;line-height:1.2;}
.brand-copy strong{font-size:17px;font-weight:600;color:var(--ink-900);letter-spacing:.01em;white-space:nowrap;}
.brand-copy small{font-size:12px;color:#667085;white-space:nowrap;}
.main-nav{display:none;align-items:center;gap:30px;margin-left:12px;}
.nav-link{
  position:relative;font-size:15px;color:var(--ink-600);
  padding:6px 0;transition:color .2s var(--ease),transform .2s var(--ease);
}
.nav-link:hover{color:var(--brand);transform:translateY(1px);}
.nav-link.is-active{color:var(--brand);font-weight:600;}
.nav-link.is-active::after{
  content:"";position:absolute;left:0;right:0;bottom:-4px;height:2px;
  border-radius:999px;background:var(--brand);
}
.header-actions{display:flex;align-items:center;gap:12px;margin-left:auto;}
.nav-search{
  display:none;align-items:center;gap:8px;
  height:40px;padding:0 16px;border-radius:999px;
  background:#F2F5FA;border:1px solid var(--line);
  transition:border-color .2s var(--ease),box-shadow .2s var(--ease);
}
.nav-search i{color:var(--ink-400);font-size:13px;}
.nav-search input{
  border:0;background:transparent;outline:none;
  font-size:14px;color:var(--ink-900);width:150px;
}
.nav-search input::placeholder{color:var(--ink-400);}
.nav-search:focus-within{border-color:var(--brand);box-shadow:0 0 0 3px rgba(58,107,255,.16);}
.nav-toggle{
  width:44px;height:44px;border-radius:12px;
  border:1px solid var(--line);background:#fff;color:var(--ink-900);
  display:inline-flex;align-items:center;justify-content:center;
  font-size:17px;cursor:pointer;transition:background .2s var(--ease),border-color .2s var(--ease);
}
.nav-toggle:hover{background:var(--paper-2);border-color:#D6DEEB;}
.mobile-drawer{
  position:fixed;left:0;right:0;top:var(--header-h);z-index:49;
  background:#fff;border-bottom:1px solid var(--line);
  box-shadow:0 18px 40px rgba(16,24,40,.10);
  padding:18px 20px 24px;
  transform:translateY(-10px);opacity:0;visibility:hidden;
  transition:opacity .22s var(--ease),transform .22s var(--ease),visibility .22s var(--ease);
}
.mobile-drawer.is-open{transform:translateY(0);opacity:1;visibility:visible;}
.mobile-drawer .drawer-nav{display:flex;flex-direction:column;gap:2px;margin-bottom:16px;}
.mobile-drawer .drawer-nav a{
  padding:12px 4px;font-size:16px;color:var(--ink-600);
  border-bottom:1px solid var(--line-2);
}
.mobile-drawer .drawer-nav a.is-active{color:var(--brand);font-weight:600;}
.drawer-search{
  display:flex;align-items:center;gap:8px;height:46px;padding:0 16px;
  border-radius:999px;background:#F2F5FA;border:1px solid var(--line);margin-bottom:14px;
}
.drawer-search input{border:0;background:transparent;outline:none;font-size:15px;width:100%;}
body.no-scroll{overflow:hidden;}
@media (min-width:1024px){
  .main-nav{display:flex;}
  .nav-search{display:flex;}
  .nav-toggle{display:none;}
  .mobile-drawer{display:none;}
}

/* ---------- Buttons ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  min-height:46px;padding:0 24px;border-radius:999px;
  font-size:15px;font-weight:600;cursor:pointer;border:1px solid transparent;
  transition:transform .2s var(--ease),box-shadow .2s var(--ease),background .2s var(--ease),border-color .2s var(--ease),color .2s var(--ease),opacity .2s var(--ease);
  white-space:nowrap;
}
.btn:disabled,.btn.is-disabled{opacity:.4;cursor:not-allowed;}
.btn-primary{background:var(--brand);color:#fff;box-shadow:0 6px 18px rgba(58,107,255,.24);}
.btn-primary:hover{background:var(--brand-700);transform:translateY(-1px);box-shadow:0 8px 24px rgba(58,107,255,.35);}
.btn-sm{min-height:40px;padding:0 20px;font-size:14px;}
.btn-glow{
  background:rgba(33,230,193,.14);color:#EAFFFA;
  border:1px solid rgba(33,230,193,.55);
  box-shadow:0 0 0 1px rgba(33,230,193,.12),0 0 24px rgba(33,230,193,.20);
}
.btn-glow:hover{background:rgba(33,230,193,.22);box-shadow:0 0 24px rgba(33,230,193,.35);transform:translateY(-1px);}
.btn-ghost-dark{background:transparent;color:rgba(255,255,255,.88);border:1px solid rgba(255,255,255,.34);}
.btn-ghost-dark:hover{background:rgba(255,255,255,.08);border-color:rgba(255,255,255,.6);}
.btn-outline{background:transparent;color:var(--brand);border:1px solid var(--brand);}
.btn-outline:hover{background:rgba(58,107,255,.08);transform:translateY(-1px);}

/* ---------- Breadcrumb ---------- */
.breadcrumb{background:var(--paper);border-bottom:1px solid var(--line-2);}
.breadcrumb ol{display:flex;flex-wrap:wrap;align-items:center;gap:8px;padding:14px 0;font-size:13px;color:#667085;}
.breadcrumb li{display:flex;align-items:center;gap:8px;}
.breadcrumb li+li::before{content:"/";color:#C3CAD6;}
.breadcrumb a:hover{color:var(--brand);}
.breadcrumb [aria-current="page"]{color:var(--ink-600);}

/* ---------- Category Hero ---------- */
.cat-hero{
  position:relative;overflow:hidden;background:var(--bg-900);
  min-height:220px;display:flex;align-items:center;
  padding:52px 0;
}
@media (min-width:1024px){.cat-hero{min-height:300px;padding:64px 0;}}
.cat-hero-bg{
  position:absolute;inset:0;background-size:cover;background-position:center right;
  opacity:.5;
}
.cat-hero::after{
  content:"";position:absolute;inset:0;
  background:linear-gradient(115deg,rgba(6,10,24,.96) 8%,rgba(6,10,24,.72) 52%,rgba(6,10,24,.55) 100%);
}
.cat-hero-inner{position:relative;z-index:2;max-width:760px;}
.cat-hero .hero-badge{
  display:inline-flex;align-items:center;gap:8px;
  font-size:13px;color:rgba(255,255,255,.82);
  padding:7px 15px;border-radius:999px;
  background:rgba(255,255,255,.10);border:1px solid rgba(255,255,255,.16);
  backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);
  margin-bottom:18px;
}
.cat-hero .hero-badge::before{
  content:"";width:7px;height:7px;border-radius:50%;
  background:var(--glow);box-shadow:0 0 10px rgba(33,230,193,.9);
}
.cat-hero h1{
  font-size:clamp(28px,4vw,44px);line-height:1.2;font-weight:700;
  color:#fff;letter-spacing:.01em;margin-bottom:14px;
}
.cat-hero-sub{
  font-size:17px;line-height:1.8;color:rgba(255,255,255,.78);
  max-width:640px;margin-bottom:26px;
}
.cat-hero-cta{display:flex;flex-wrap:wrap;gap:14px;}
.cat-hero-cta .btn{width:100%;}
@media (min-width:640px){.cat-hero-cta .btn{width:auto;}}

/* ---------- Sections ---------- */
.section{padding:56px 0;}
@media (min-width:768px){.section{padding:72px 0;}}
@media (min-width:1024px){.section{padding:96px 0;}}
.section-light{background:var(--paper);}
.section-soft{background:var(--paper-2);}
.section-dark{background:var(--bg-900);color:rgba(255,255,255,.86);}
.section-head{max-width:720px;margin-bottom:32px;}
@media (min-width:1024px){.section-head{margin-bottom:40px;}}
.eyebrow{
  display:inline-block;font-size:13px;font-weight:600;letter-spacing:.14em;
  color:var(--brand);text-transform:uppercase;margin-bottom:12px;
}
.section-dark .eyebrow{color:var(--glow);}
.section-head h2{
  font-size:clamp(23px,2.6vw,33px);line-height:1.28;font-weight:600;
  color:var(--ink-900);margin-bottom:12px;
}
.section-dark .section-head h2{color:#fff;}
.section-head p{font-size:16px;color:var(--ink-600);line-height:1.8;}
.section-dark .section-head p{color:rgba(255,255,255,.68);}

/* ---------- Stats strip ---------- */
.stats-strip{
  display:grid;grid-template-columns:1fr;gap:18px;
  margin-top:34px;padding-top:26px;border-top:1px solid rgba(255,255,255,.10);
}
@media (min-width:640px){.stats-strip{grid-template-columns:repeat(3,1fr);}}
.stat-item{padding-left:16px;border-left:2px solid rgba(255,255,255,.14);}
.stat-item:first-child{border-left-color:var(--glow);}
.stat-num{
  font-size:28px;font-weight:700;color:#fff;
  font-variant-numeric:tabular-nums;letter-spacing:.02em;line-height:1.3;
}
.stat-label{font-size:13px;color:rgba(255,255,255,.62);}

/* ---------- Timeline ---------- */
.tl-list{position:relative;padding-left:30px;}
.tl-list::before{
  content:"";position:absolute;left:5px;top:10px;bottom:10px;width:4px;border-radius:999px;
  background:linear-gradient(180deg,var(--brand) 0%,var(--glow) 72%,rgba(33,230,193,0) 100%);
}
.tl-item{position:relative;padding-bottom:26px;}
.tl-item:last-child{padding-bottom:0;}
.tl-node{
  position:absolute;left:-30px;top:22px;width:12px;height:12px;border-radius:50%;
  background:#fff;border:2px solid var(--brand);
  box-shadow:0 0 0 4px rgba(33,230,193,.15);
}
.tl-item.is-first .tl-node{background:var(--glow);border-color:var(--glow);box-shadow:0 0 0 5px rgba(33,230,193,.18);}
.tl-card{
  background:#fff;border:1px solid var(--line);border-radius:var(--r-lg);
  padding:20px 22px;box-shadow:var(--sh-1);
  display:flex;flex-wrap:wrap;gap:14px 18px;align-items:flex-start;
  transition:transform .22s var(--ease),box-shadow .22s var(--ease),border-color .22s var(--ease);
}
.tl-card:hover{transform:translateY(-4px);box-shadow:var(--sh-2);border-color:#D9E1F0;}
.tl-index{
  font-size:15px;font-weight:700;color:var(--brand);
  font-variant-numeric:tabular-nums;letter-spacing:.02em;
  padding-top:3px;min-width:30px;
}
.tl-main{flex:1 1 240px;min-width:0;}
.tl-main h3{font-size:18px;font-weight:600;line-height:1.5;margin-bottom:8px;color:var(--ink-900);}
.tl-main p{font-size:15px;color:var(--ink-600);line-height:1.8;}
.text-link{
  display:inline-flex;align-items:center;gap:6px;margin-top:12px;
  font-size:14px;font-weight:600;color:var(--brand);
  transition:gap .2s var(--ease),color .2s var(--ease);
}
.text-link:hover{gap:10px;color:var(--brand-700);}
.tag{
  display:inline-flex;align-items:center;
  font-size:13px;line-height:1.5;padding:5px 12px;border-radius:999px;
  background:rgba(58,107,255,.08);color:var(--brand);white-space:nowrap;
}
.tag-dark{background:rgba(255,255,255,.10);color:rgba(255,255,255,.82);}

/* ---------- Scene list ---------- */
.scene-grid{display:grid;grid-template-columns:1fr;gap:16px;}
@media (min-width:768px){.scene-grid{grid-template-columns:repeat(2,1fr);gap:20px;}}
.scene-item{
  display:flex;gap:16px;align-items:flex-start;
  background:#fff;border:1px solid var(--line);border-radius:var(--r-lg);
  padding:20px;transition:transform .22s var(--ease),box-shadow .22s var(--ease);
}
.scene-item:hover{transform:translateY(-4px);box-shadow:var(--sh-2);}
.scene-icon{
  flex:0 0 44px;width:44px;height:44px;border-radius:14px;
  display:flex;align-items:center;justify-content:center;
  background:rgba(58,107,255,.08);color:var(--brand);font-size:17px;
}
.scene-item h3{font-size:17px;font-weight:600;margin-bottom:6px;line-height:1.5;}
.scene-item p{font-size:15px;color:var(--ink-600);line-height:1.8;}
.scene-meta{display:flex;flex-wrap:wrap;gap:8px;margin-top:10px;}

/* ---------- Prep split ---------- */
.prep-visual{position:relative;border-radius:var(--r-xl);overflow:hidden;box-shadow:var(--sh-1);}
.prep-visual img{width:100%;height:100%;min-height:260px;object-fit:cover;}
.prep-visual::after{
  content:"";position:absolute;inset:0;
  background:linear-gradient(180deg,rgba(6,10,24,0) 45%,rgba(6,10,24,.62) 100%);
}
.prep-visual-cap{
  position:absolute;left:20px;right:20px;bottom:18px;z-index:2;
  font-size:14px;color:rgba(255,255,255,.92);line-height:1.7;
}
.prep-list li{
  display:flex;gap:14px;align-items:flex-start;
  padding:16px 0;border-bottom:1px solid var(--line-2);
}
.prep-list li:last-child{border-bottom:0;padding-bottom:0;}
.prep-check{
  flex:0 0 22px;width:22px;height:22px;border-radius:50%;margin-top:4px;
  display:flex;align-items:center;justify-content:center;
  background:rgba(33,230,193,.16);color:var(--glow-ink);font-size:11px;
}
.prep-list h3{font-size:16px;font-weight:600;margin-bottom:4px;}
.prep-list p{font-size:15px;color:var(--ink-600);line-height:1.8;}

/* ---------- FAQ ---------- */
.faq-layout{display:grid;grid-template-columns:1fr;gap:28px;}
@media (min-width:1024px){.faq-layout{grid-template-columns:minmax(0,4fr) minmax(0,8fr);gap:56px;}}
.faq-list{display:flex;flex-direction:column;gap:12px;}
.faq-item{
  background:#fff;border:1px solid var(--line);border-radius:var(--r-sm);
  overflow:hidden;transition:border-color .2s var(--ease),box-shadow .2s var(--ease);
}
.faq-item:hover{border-color:#C9D6F5;box-shadow:var(--sh-1);}
.faq-item.is-open{border-color:rgba(58,107,255,.45);}
.faq-q{
  width:100%;display:flex;align-items:center;justify-content:space-between;gap:16px;
  padding:18px 20px;background:transparent;border:0;cursor:pointer;text-align:left;
  font-size:17px;font-weight:600;color:var(--ink-900);line-height:1.55;
}
.faq-q i{color:var(--brand);font-size:14px;transition:transform .24s var(--ease);}
.faq-item.is-open .faq-q i{transform:rotate(180deg);}
.faq-a{max-height:0;overflow:hidden;transition:max-height .3s var(--ease);}
.faq-a-inner{padding:0 20px 20px;font-size:15px;color:var(--ink-600);line-height:1.85;}
.faq-item.is-open .faq-a{max-height:340px;}

/* ---------- CTA band ---------- */
.cta-band{background:var(--bg-900);padding:48px 0;}
@media (min-width:1024px){.cta-band{padding:64px 0;}}
.cta-band-inner{
  display:flex;flex-direction:column;gap:22px;
  background:rgba(255,255,255,.06);
  border:1px solid rgba(255,255,255,.14);
  border-radius:var(--r-xl);padding:30px 26px;
  backdrop-filter:blur(16px);-webkit-backdrop-filter:blur(16px);
  box-shadow:var(--sh-glass);
}
@media (min-width:1024px){
  .cta-band-inner{flex-direction:row;align-items:center;justify-content:space-between;padding:38px 42px;}
}
.cta-band h2{font-size:clamp(21px,2.2vw,28px);font-weight:600;color:#fff;line-height:1.35;margin-bottom:8px;}
.cta-band p{font-size:15px;color:rgba(255,255,255,.68);line-height:1.8;max-width:640px;}
.cta-band .btn{width:100%;}
@media (min-width:640px){.cta-band .btn{width:auto;}}

/* ---------- Footer ---------- */
.site-footer{background:var(--bg-900);border-top:1px solid rgba(255,255,255,.08);padding-top:56px;color:rgba(255,255,255,.6);}
.footer-grid{display:grid;grid-template-columns:1fr;gap:34px;padding-bottom:44px;}
@media (min-width:640px){.footer-grid{grid-template-columns:repeat(2,1fr);}}
@media (min-width:1024px){.footer-grid{grid-template-columns:1.5fr 1fr 1fr 1fr;gap:40px;}}
.brand-footer{margin-bottom:16px;}
.brand-footer .brand-copy strong{color:#fff;}
.brand-footer .brand-copy small{color:rgba(255,255,255,.5);}
.footer-brand p{font-size:14px;line-height:1.85;color:rgba(255,255,255,.6);margin-bottom:10px;}
.footer-contact{color:rgba(255,255,255,.72);font-variant-numeric:tabular-nums;}
.footer-col h4{font-size:15px;font-weight:600;color:#fff;margin-bottom:16px;}
.footer-col ul{display:flex;flex-direction:column;gap:11px;}
.footer-col a{font-size:14px;color:rgba(255,255,255,.6);transition:color .2s var(--ease);}
.footer-col a:hover{color:var(--glow);}
.footer-bottom{border-top:1px solid rgba(255,255,255,.08);padding:18px 0;}
.footer-bottom-inner{
  display:flex;flex-direction:column;gap:8px;font-size:13px;color:rgba(255,255,255,.45);
}
@media (min-width:768px){.footer-bottom-inner{flex-direction:row;align-items:center;justify-content:space-between;}}

/* ---------- Back to top ---------- */
.to-top{
  position:fixed;right:18px;bottom:22px;z-index:60;
  width:44px;height:44px;border-radius:50%;
  background:var(--bg-800);border:1px solid rgba(33,230,193,.55);color:var(--glow);
  display:flex;align-items:center;justify-content:center;cursor:pointer;
  opacity:0;visibility:hidden;transform:translateY(8px);
  transition:opacity .22s var(--ease),transform .22s var(--ease),visibility .22s var(--ease),background .22s var(--ease);
}
.to-top.is-visible{opacity:1;visibility:visible;transform:translateY(0);}
.to-top:hover{background:#12203C;box-shadow:0 0 20px rgba(33,230,193,.3);}

/* roulang page: category3 */
:root{
  --bg-900:#060A18;
  --bg-800:#0B1226;
  --brand:#3A6BFF;
  --brand-700:#2A50D6;
  --glow:#21E6C1;
  --glow-ink:#0E9C84;
  --ink-900:#101828;
  --ink-600:#475467;
  --ink-400:#98A2B3;
  --line:#E5E9F2;
  --line-soft:#EEF1F6;
  --paper:#FFFFFF;
  --paper-2:#F6F8FC;
  --amber:#FF7A3D;
  --danger:#FF6B6B;
  --r-lg:20px;
  --r:16px;
  --r-sm:12px;
  --sh:0 1px 2px rgba(16,24,40,.04), 0 8px 24px rgba(16,24,40,.06);
  --sh-hover:0 12px 32px rgba(16,24,40,.10);
  --glass-bg:rgba(255,255,255,.06);
  --glass-line:rgba(255,255,255,.14);
  --ease:200ms cubic-bezier(.2,.7,.3,1);
  --font:"PingFang SC","HarmonyOS Sans SC","Source Han Sans SC","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",sans-serif;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  margin:0;
  font-family:var(--font);
  font-size:16px;
  line-height:1.85;
  color:var(--ink-900);
  background:var(--paper);
  -webkit-font-smoothing:antialiased;
}
body.no-scroll{overflow:hidden}
img{max-width:100%;display:block;border:0}
a{color:inherit;text-decoration:none}
button,input,select,textarea{font:inherit;color:inherit;margin:0}
button{background:none;border:0;cursor:pointer}
ul{list-style:none;margin:0;padding:0}
h1,h2,h3,h4,p{margin:0}
h1{font-size:clamp(30px,4.6vw,52px);line-height:1.15;font-weight:700;letter-spacing:.01em}
h2{font-size:clamp(24px,2.6vw,34px);line-height:1.25;font-weight:600;letter-spacing:.01em}
h3{font-size:20px;line-height:1.45;font-weight:600}
h4{font-size:17px;line-height:1.5;font-weight:600}
p{line-height:1.85}
.num{font-variant-numeric:tabular-nums;letter-spacing:.02em}
a:focus-visible,button:focus-visible,input:focus-visible,summary:focus-visible{outline:2px solid var(--brand);outline-offset:2px;border-radius:6px}
.dark-section a:focus-visible,.dark-section button:focus-visible,.cta-band a:focus-visible,.site-footer a:focus-visible{outline-color:var(--glow)}

.container{width:100%;max-width:1200px;margin:0 auto;padding:0 20px}
@media (min-width:768px){.container{padding:0 32px}}
@media (min-width:1280px){.container{max-width:1280px}}

/* ---------- header ---------- */
.site-header{
  position:sticky;top:0;z-index:60;
  background:#fff;
  border-bottom:1px solid #E9EDF5;
  transition:box-shadow var(--ease);
}
.site-header.is-scrolled{box-shadow:0 4px 16px rgba(16,24,40,.08)}
.header-inner{display:flex;align-items:center;gap:24px;height:68px}
.brand{display:flex;align-items:center;gap:10px;flex:0 0 auto}
.brand-mark{
  width:28px;height:28px;border-radius:9px;
  display:inline-flex;align-items:center;justify-content:center;
  background:linear-gradient(135deg,#3A6BFF 0%,#2A50D6 100%);
  box-shadow:0 4px 12px rgba(58,107,255,.28);
}
.brand-copy{display:flex;flex-direction:column;line-height:1.2}
.brand-copy strong{font-size:17px;font-weight:600;color:var(--ink-900);letter-spacing:.01em}
.brand-copy small{font-size:12px;color:#667085;margin-top:2px}
.main-nav{display:flex;align-items:center;gap:28px;margin-left:8px}
.nav-link{
  position:relative;display:inline-block;
  font-size:15px;font-weight:500;color:var(--ink-600);
  padding:6px 0;transition:color var(--ease),transform var(--ease);
}
.nav-link::after{
  content:"";position:absolute;left:0;right:0;bottom:-2px;height:2px;border-radius:2px;
  background:var(--brand);transform:scaleX(0);transform-origin:left;transition:transform var(--ease);
}
.nav-link:hover{color:var(--brand);transform:translateY(1px)}
.nav-link.is-active{color:var(--brand)}
.nav-link.is-active::after{transform:scaleX(1)}
.header-actions{display:flex;align-items:center;gap:14px;margin-left:auto}
.nav-search{
  display:flex;align-items:center;gap:8px;
  height:40px;padding:0 16px;border-radius:999px;
  background:#F2F5FA;border:1px solid var(--line);
  transition:border-color var(--ease),box-shadow var(--ease),background var(--ease);
}
.nav-search svg{flex:0 0 auto;opacity:.7}
.nav-search input{
  border:0;background:transparent;outline:none;
  font-size:14px;width:132px;color:var(--ink-900);
}
.nav-search input::placeholder{color:var(--ink-400)}
.nav-search:focus-within{border-color:var(--brand);background:#fff;box-shadow:0 0 0 3px rgba(58,107,255,.16)}
.menu-toggle{
  display:none;width:44px;height:44px;border-radius:12px;
  align-items:center;justify-content:center;
  border:1px solid var(--line);color:var(--ink-900);
  transition:background var(--ease),border-color var(--ease);
}
.menu-toggle:hover{background:var(--paper-2);border-color:#D6DDEA}
.mobile-drawer{
  position:fixed;left:0;right:0;top:60px;bottom:0;z-index:59;
  background:#fff;padding:20px 20px 48px;overflow-y:auto;
  transform:translateY(-10px);opacity:0;visibility:hidden;
  transition:opacity var(--ease),transform var(--ease),visibility var(--ease);
  border-top:1px solid var(--line-soft);
}
.mobile-drawer.is-open{transform:none;opacity:1;visibility:visible}
.drawer-nav{display:flex;flex-direction:column;gap:4px;margin-bottom:20px}
.drawer-nav a{
  display:flex;align-items:center;justify-content:space-between;
  font-size:16px;font-weight:500;color:var(--ink-900);
  padding:14px 12px;border-radius:12px;transition:background var(--ease),color var(--ease);
}
.drawer-nav a:hover,.drawer-nav a.is-active{background:#F2F6FF;color:var(--brand)}
.drawer-search{display:flex;align-items:center;gap:8px;height:48px;padding:0 18px;border-radius:999px;background:#F2F5FA;border:1px solid var(--line);margin-bottom:16px}
.drawer-search input{border:0;background:transparent;outline:none;font-size:15px;width:100%}
.drawer-cta{display:flex;flex-direction:column;gap:12px}
.drawer-note{font-size:13px;color:var(--ink-400);margin-top:18px;line-height:1.8}

/* ---------- buttons ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  min-height:46px;padding:0 22px;border-radius:999px;
  font-size:15px;font-weight:600;letter-spacing:.01em;
  transition:background var(--ease),color var(--ease),box-shadow var(--ease),transform var(--ease),border-color var(--ease);
  border:1px solid transparent;cursor:pointer;white-space:nowrap;
}
.btn-sm{min-height:40px;padding:0 20px;font-size:14px}
.btn-primary{background:var(--brand);color:#fff;box-shadow:0 6px 18px rgba(58,107,255,.24)}
.btn-primary:hover{background:var(--brand-700);transform:translateY(-1px);box-shadow:0 10px 26px rgba(58,107,255,.34)}
.btn-primary:active{transform:translateY(0);box-shadow:0 4px 12px rgba(58,107,255,.24)}
.btn-outline{border-color:var(--line);color:var(--ink-900);background:#fff}
.btn-outline:hover{border-color:var(--brand);color:var(--brand);background:rgba(58,107,255,.06)}
.btn-glow{
  background:rgba(33,230,193,.14);color:#B9FFF1;border-color:rgba(33,230,193,.55);
  box-shadow:0 0 0 1px rgba(33,230,193,.18) inset;
}
.btn-glow:hover{background:rgba(33,230,193,.22);box-shadow:0 0 24px rgba(33,230,193,.35);transform:translateY(-1px)}
.btn-outline-light{border-color:rgba(255,255,255,.28);color:rgba(255,255,255,.9);background:transparent}
.btn-outline-light:hover{border-color:rgba(255,255,255,.55);background:rgba(255,255,255,.08)}
.btn[disabled],.btn.is-disabled{opacity:.4;cursor:not-allowed;transform:none;box-shadow:none}

/* ---------- breadcrumbs ---------- */
.crumbs{background:#fff;padding:16px 0 0}
.crumbs-inner{display:flex;align-items:center;gap:8px;font-size:13px;color:#667085;flex-wrap:wrap}
.crumbs-inner a{color:#667085;transition:color var(--ease)}
.crumbs-inner a:hover{color:var(--brand)}
.crumbs-inner .sep{color:#C3CAD6}
.crumbs-inner .current{color:var(--ink-900);font-weight:500}

/* ---------- page hero ---------- */
.page-hero{
  position:relative;overflow:hidden;
  min-height:300px;margin-top:16px;
  display:flex;align-items:center;
  color:#fff;
  background:linear-gradient(180deg,rgba(6,10,24,.42),rgba(6,10,24,.86)),url("/assets/images/backpic/back-3.png") center right/cover no-repeat;
}
.page-hero::after{
  content:"";position:absolute;width:520px;height:520px;right:-120px;top:-180px;
  background:radial-gradient(circle,rgba(33,230,193,.16),rgba(33,230,193,0) 68%);
  pointer-events:none;
}
.page-hero-inner{position:relative;z-index:2;padding:44px 0;max-width:840px}
.hero-badge{
  display:inline-flex;align-items:center;gap:8px;
  padding:6px 14px;border-radius:999px;font-size:13px;
  background:var(--glass-bg);border:1px solid var(--glass-line);
  color:rgba(255,255,255,.86);backdrop-filter:blur(16px);
  margin-bottom:18px;
}
.hero-badge .dot{width:6px;height:6px;border-radius:50%;background:var(--glow);box-shadow:0 0 10px rgba(33,230,193,.9)}
.page-hero h1{color:#fff;margin-bottom:14px}
.page-hero .hero-sub{font-size:18px;line-height:1.8;color:rgba(255,255,255,.78);max-width:720px}
.hero-actions{display:flex;flex-wrap:wrap;gap:14px;margin-top:26px}

/* ---------- sections ---------- */
.section{padding:88px 0}
.section-tight{padding:72px 0}
.section-head{max-width:760px;margin-bottom:36px}
.eyebrow{
  display:inline-block;font-size:13px;font-weight:600;letter-spacing:.14em;
  color:var(--brand);text-transform:uppercase;margin-bottom:12px;
}
.section-head h2{margin-bottom:12px}
.section-head p{color:var(--ink-600);font-size:16px;max-width:680px}
.dark-section{background:var(--bg-900);color:rgba(255,255,255,.86)}
.dark-section .section-head h2{color:#fff}
.dark-section .section-head p{color:rgba(255,255,255,.62)}
.dark-section .eyebrow{color:var(--glow)}
.bg-soft{background:var(--paper-2)}

/* ---------- compare list ---------- */
.compare-list{
  border-radius:var(--r-lg);overflow:hidden;
  border:1px solid rgba(255,255,255,.10);
  box-shadow:0 18px 40px rgba(0,0,0,.35);
}
.compare-row{
  display:grid;grid-template-columns:270px 1fr;gap:32px;
  padding:26px 30px;
  background:var(--bg-800);
  border-bottom:1px solid rgba(255,255,255,.06);
  transition:background var(--ease),box-shadow var(--ease);
}
.compare-row:nth-child(even){background:rgba(255,255,255,.03)}
.compare-row:last-child{border-bottom:0}
.compare-row:hover{background:rgba(58,107,255,.10);box-shadow:inset 0 0 0 1px rgba(33,230,193,.35)}
.compare-label{display:flex;flex-direction:column;gap:10px}
.row-num{
  font-size:13px;font-weight:600;color:var(--glow);
  font-variant-numeric:tabular-nums;letter-spacing:.08em;
}
.row-tag{
  align-self:flex-start;
  font-size:13px;padding:4px 12px;border-radius:999px;
  background:rgba(255,255,255,.10);color:rgba(255,255,255,.82);
}
.compare-label h3{color:#fff;font-size:18px;line-height:1.5}
.compare-body p{color:rgba(255,255,255,.70);font-size:15px;line-height:1.8}
.compare-body .compare-tip{
  margin-top:10px;color:rgba(255,255,255,.86);font-size:15px;
  padding-left:14px;border-left:2px solid rgba(33,230,193,.6);
}
.text-link{
  display:inline-flex;align-items:center;gap:6px;
  margin-top:12px;font-size:14px;font-weight:600;color:var(--glow);
  border-bottom:1px solid rgba(33,230,193,.35);
  transition:color var(--ease),border-color var(--ease),gap var(--ease);
}
.text-link:hover{color:#8FFFF0;border-color:#8FFFF0;gap:10px}
.text-link.on-light{color:var(--brand);border-color:rgba(58,107,255,.35)}
.text-link.on-light:hover{color:var(--brand-700);border-color:var(--brand-700)}

/* ---------- scene cards ---------- */
.scene-grid{display:grid;grid-template-columns:1fr 1fr;gap:24px}
.scene-card{
  display:grid;grid-template-columns:200px 1fr;gap:22px;align-items:stretch;
  background:#fff;border:1px solid var(--line);border-radius:var(--r);
  padding:18px;box-shadow:var(--sh);
  transition:transform var(--ease),box-shadow var(--ease),border-color var(--ease);
}
.scene-card:hover{transform:translateY(-4px);box-shadow:var(--sh-hover);border-color:#D8E1F5}
.scene-thumb{border-radius:var(--r-sm);overflow:hidden;background:linear-gradient(135deg,#3A6BFF,#0B1226);min-height:150px}
.scene-thumb img{width:100%;height:100%;object-fit:cover}
.scene-card h3{font-size:18px;margin-bottom:8px}
.scene-card p{font-size:15px;color:var(--ink-600)}
.scene-tags{display:flex;flex-wrap:wrap;gap:8px;margin-top:14px}
.tag{
  font-size:13px;padding:4px 12px;border-radius:999px;
  background:rgba(58,107,255,.08);color:var(--brand);font-weight:500;
}

/* ---------- steps ---------- */
.step-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.step-card{
  position:relative;background:#fff;border:1px solid var(--line);
  border-radius:var(--r);padding:24px 22px 26px;box-shadow:var(--sh);
  transition:transform var(--ease),box-shadow var(--ease),border-color var(--ease);
}
.step-card::before{
  content:"";position:absolute;left:22px;top:0;width:36px;height:3px;border-radius:0 0 3px 3px;
  background:linear-gradient(90deg,var(--brand),var(--glow));
}
.step-card:hover{transform:translateY(-4px);box-shadow:var(--sh-hover);border-color:#D8E1F5}
.step-index{
  display:inline-block;font-size:13px;font-weight:600;color:var(--glow-ink);
  letter-spacing:.06em;margin-bottom:12px;font-variant-numeric:tabular-nums;
}
.step-card h3{font-size:17px;margin-bottom:10px}
.step-card p{font-size:15px;color:var(--ink-600)}

/* ---------- faq ---------- */
.faq-layout{display:grid;grid-template-columns:4fr 8fr;gap:48px;align-items:start}
.faq-aside{position:sticky;top:96px}
.faq-aside h2{margin-bottom:12px}
.faq-aside p{color:var(--ink-600);font-size:15px;margin-bottom:20px}
.faq-item{
  background:#fff;border:1px solid var(--line);border-radius:var(--r-sm);
  margin-bottom:12px;overflow:hidden;
  transition:border-color var(--ease),box-shadow var(--ease);
}
.faq-item:hover{border-color:var(--brand);box-shadow:var(--sh)}
.faq-item summary{
  display:flex;align-items:center;justify-content:space-between;gap:16px;
  padding:18px 20px;font-size:17px;font-weight:600;cursor:pointer;list-style:none;
}
.faq-item summary::-webkit-details-marker{display:none}
.faq-item summary::after{
  content:"+";flex:0 0 auto;width:24px;text-align:center;
  font-size:20px;font-weight:400;color:var(--brand);line-height:1;
  transition:transform var(--ease),color var(--ease);
}
.faq-item[open] summary::after{content:"−"}
.faq-item[open]{border-color:#D8E1F5;box-shadow:var(--sh)}
.faq-answer{padding:0 20px 20px;color:var(--ink-600);font-size:15.5px;line-height:1.85}

/* ---------- cta band ---------- */
.cta-band{background:var(--bg-900);padding:64px 0;color:#fff;border-top:1px solid rgba(255,255,255,.08)}
.cta-band-inner{display:flex;align-items:center;justify-content:space-between;gap:32px}
.cta-band h2{font-size:clamp(22px,2.4vw,30px);color:#fff;margin-bottom:10px}
.cta-band p{color:rgba(255,255,255,.66);font-size:15.5px;max-width:640px}
.cta-actions{display:flex;gap:14px;flex-wrap:wrap;flex:0 0 auto}

/* ---------- footer ---------- */
.site-footer{background:var(--bg-900);color:rgba(255,255,255,.6);border-top:1px solid rgba(255,255,255,.08);padding-top:64px}
.footer-grid{display:grid;grid-template-columns:1.6fr 1fr 1fr 1fr;gap:40px;padding-bottom:48px}
.brand-footer{margin-bottom:18px}
.brand-footer .brand-copy strong{color:#fff}
.brand-footer .brand-copy small{color:rgba(255,255,255,.5)}
.footer-brand p{font-size:14.5px;line-height:1.85;color:rgba(255,255,255,.6);max-width:340px}
.footer-contact{margin-top:12px;color:rgba(255,255,255,.72);font-size:14.5px}
.footer-col h4{font-size:15px;color:#fff;margin-bottom:16px;letter-spacing:.02em}
.footer-col ul{display:flex;flex-direction:column;gap:11px}
.footer-col a{font-size:14.5px;color:rgba(255,255,255,.6);transition:color var(--ease)}
.footer-col a:hover{color:var(--glow)}
.footer-bottom{border-top:1px solid rgba(255,255,255,.08);padding:20px 0}
.footer-bottom-inner{display:flex;align-items:center;justify-content:space-between;gap:16px;flex-wrap:wrap;font-size:13.5px;color:rgba(255,255,255,.45)}

/* ---------- to top ---------- */
.to-top{
  position:fixed;right:24px;bottom:24px;z-index:70;
  width:44px;height:44px;border-radius:50%;
  display:flex;align-items:center;justify-content:center;
  background:var(--bg-800);border:1px solid rgba(33,230,193,.55);color:var(--glow);
  opacity:0;visibility:hidden;transform:translateY(8px);
  transition:opacity var(--ease),transform var(--ease),visibility var(--ease),box-shadow var(--ease);
}
.to-top.is-visible{opacity:1;visibility:visible;transform:none}
.to-top:hover{box-shadow:0 0 22px rgba(33,230,193,.4)}

/* ---------- responsive ---------- */
@media (max-width:1279px){
  .nav-search input{width:110px}
  .main-nav{gap:22px}
}
@media (max-width:1023px){
  .main-nav,.nav-search{display:none}
  .menu-toggle{display:inline-flex}
  .header-inner{height:60px}
  .section{padding:72px 0}
  .section-tight{padding:60px 0}
  .compare-row{grid-template-columns:1fr;gap:14px;padding:22px 22px}
  .scene-grid{grid-template-columns:1fr}
  .step-grid{grid-template-columns:repeat(2,1fr)}
  .faq-layout{grid-template-columns:1fr;gap:28px}
  .faq-aside{position:static}
  .footer-grid{grid-template-columns:1fr 1fr;gap:32px}
  .cta-band-inner{flex-direction:column;align-items:flex-start;gap:22px}
  .page-hero{min-height:260px}
}
@media (max-width:767px){
  .section{padding:56px 0}
  .section-tight{padding:52px 0}
  .page-hero{min-height:224px;margin-top:12px}
  .page-hero-inner{padding:36px 0}
  .page-hero .hero-sub{font-size:16px}
  .hero-actions{flex-direction:column;align-items:stretch}
  .hero-actions .btn{width:100%}
  .scene-card{grid-template-columns:1fr;gap:16px}
  .scene-thumb{min-height:170px}
  .step-grid{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr;gap:28px;padding-bottom:36px}
  .footer-bottom-inner{flex-direction:column;align-items:flex-start;gap:8px}
  .brand-copy small{display:none}
  .to-top{right:16px;bottom:16px}
}
@media (max-width:399px){
  .brand-copy strong{font-size:15px}
  .container{padding:0 16px}
}

/* roulang page: category2 */
:root{
  --bg-900:#060A18;
  --bg-800:#0B1226;
  --brand:#3A6BFF;
  --brand-700:#2A50D6;
  --brand-50:rgba(58,107,255,.08);
  --glow:#21E6C1;
  --glow-ink:#0E9C84;
  --ink-900:#101828;
  --ink-600:#475467;
  --ink-400:#98A2B3;
  --line:#E5E9F2;
  --line-soft:#EEF1F6;
  --paper:#FFFFFF;
  --paper-2:#F6F8FC;
  --amber:#FF7A3D;
  --danger:#FF6B6B;
  --radius-lg:20px;
  --radius:16px;
  --radius-sm:12px;
  --shadow-1:0 1px 2px rgba(16,24,40,.04),0 8px 24px rgba(16,24,40,.06);
  --shadow-2:0 12px 32px rgba(16,24,40,.10);
  --shadow-glass:0 0 0 1px rgba(255,255,255,.10),0 18px 40px rgba(0,0,0,.35);
  --ease:cubic-bezier(.4,0,.2,1);
  --t:200ms var(--ease);
  --container:1200px;
}
*,*::before,*::after{box-sizing:border-box;}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;}
body{
  margin:0;
  font-family:"PingFang SC","HarmonyOS Sans SC","Source Han Sans SC","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",sans-serif;
  font-size:16px;
  line-height:1.85;
  color:var(--ink-900);
  background:var(--paper);
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
body.no-scroll{overflow:hidden;}
img{display:block;max-width:100%;}
a{color:inherit;text-decoration:none;}
button{font-family:inherit;}
ul,ol{margin:0;padding:0;list-style:none;}
h1,h2,h3,h4,p{margin:0;}
svg{display:block;}
:focus-visible{outline:2px solid var(--brand);outline-offset:2px;}
.on-dark :focus-visible,.page-hero :focus-visible,.cta-band :focus-visible,.site-footer :focus-visible{outline-color:var(--glow);}

.container{width:100%;max-width:var(--container);margin:0 auto;padding:0 32px;}
@media (min-width:1280px){.container{max-width:1280px;}}

/* ---------- Header ---------- */
.site-header{
  position:sticky;top:0;z-index:60;background:#fff;
  border-bottom:1px solid #E9EDF5;
  transition:box-shadow var(--t);
}
.site-header.is-scrolled{box-shadow:0 4px 16px rgba(16,24,40,.08);}
.header-inner{display:flex;align-items:center;gap:26px;height:68px;}
.brand{display:flex;align-items:center;gap:10px;flex-shrink:0;}
.brand-mark{
  width:28px;height:28px;border-radius:9px;display:flex;align-items:center;justify-content:center;
  background:linear-gradient(135deg,#5B86FF 0%,#2A50D6 100%);
  box-shadow:0 4px 12px rgba(58,107,255,.32);
}
.brand-copy strong{display:block;font-size:17px;font-weight:600;line-height:1.25;color:var(--ink-900);letter-spacing:.01em;}
.brand-copy small{display:block;font-size:12px;line-height:1.4;color:#667085;}
.main-nav{display:flex;align-items:center;gap:30px;}
.nav-link{
  position:relative;font-size:15px;color:var(--ink-600);padding:6px 0;
  transition:color var(--t),transform var(--t);
}
.nav-link:hover{color:var(--brand);transform:translateY(1px);}
.nav-link.is-active{color:var(--brand);font-weight:600;}
.nav-link.is-active::after{
  content:"";position:absolute;left:0;right:0;bottom:-4px;height:2px;border-radius:2px;background:var(--brand);
}
.header-right{display:flex;align-items:center;gap:14px;margin-left:auto;}
.nav-search{
  display:flex;align-items:center;gap:8px;height:40px;padding:0 16px;border-radius:999px;
  background:#F2F5FA;border:1px solid var(--line);
  transition:border-color var(--t),box-shadow var(--t),background var(--t);
}
.nav-search:focus-within{border-color:var(--brand);background:#fff;box-shadow:0 0 0 3px rgba(58,107,255,.16);}
.nav-search svg{flex-shrink:0;color:var(--ink-400);}
.nav-search input{
  border:0;background:transparent;outline:none;font-family:inherit;
  font-size:14px;width:150px;color:var(--ink-900);
}
.nav-search input::placeholder{color:var(--ink-400);}
.nav-toggle{
  display:none;width:44px;height:44px;align-items:center;justify-content:center;
  border:1px solid var(--line);border-radius:12px;background:#fff;color:var(--ink-900);cursor:pointer;
  transition:border-color var(--t),background var(--t);
}
.nav-toggle:hover{border-color:var(--brand);background:var(--brand-50);color:var(--brand);}
@media (max-width:1279px){
  .main-nav{gap:20px;}
  .nav-link{font-size:14px;}
  .nav-search input{width:110px;}
}
@media (max-width:1023px){
  .main-nav,.nav-search{display:none;}
  .nav-toggle{display:flex;}
  .header-inner{height:60px;gap:12px;}
  .brand-copy small{display:none;}
  .brand-copy strong{font-size:16px;}
}
@media (max-width:520px){
  .container{padding:0 20px;}
  .brand-mark{width:26px;height:26px;border-radius:8px;}
  .brand-copy strong{font-size:15px;}
}

/* ---------- Mobile drawer ---------- */
.mobile-drawer{
  position:fixed;left:0;right:0;top:60px;bottom:0;z-index:55;background:#fff;
  padding:20px;overflow-y:auto;
  transform:translateY(-10px);opacity:0;visibility:hidden;
  transition:opacity var(--t),transform var(--t),visibility var(--t);
}
.mobile-drawer.is-open{opacity:1;visibility:visible;transform:translateY(0);}
.drawer-head{display:flex;align-items:center;justify-content:space-between;margin-bottom:16px;}
.drawer-head span{font-size:13px;letter-spacing:.12em;color:var(--ink-400);}
.drawer-close{
  width:44px;height:44px;display:flex;align-items:center;justify-content:center;
  border:1px solid var(--line);border-radius:12px;background:#fff;color:var(--ink-900);cursor:pointer;
  transition:border-color var(--t),background var(--t);
}
.drawer-close:hover{border-color:var(--brand);background:var(--brand-50);color:var(--brand);}
.drawer-search{
  display:flex;align-items:center;gap:10px;height:48px;padding:0 16px;border-radius:999px;
  background:#F2F5FA;border:1px solid var(--line);margin-bottom:18px;
}
.drawer-search:focus-within{border-color:var(--brand);background:#fff;box-shadow:0 0 0 3px rgba(58,107,255,.16);}
.drawer-search input{border:0;background:transparent;outline:none;font-family:inherit;font-size:15px;width:100%;color:var(--ink-900);}
.drawer-nav{display:flex;flex-direction:column;gap:4px;margin-bottom:20px;}
.drawer-link{
  display:flex;align-items:center;justify-content:space-between;
  padding:14px 16px;border-radius:var(--radius-sm);font-size:16px;color:var(--ink-900);
  transition:background var(--t),color var(--t);
}
.drawer-link:hover{background:var(--paper-2);color:var(--brand);}
.drawer-link.is-active{background:var(--brand-50);color:var(--brand);font-weight:600;}
.drawer-cta{width:100%;}
.drawer-note{font-size:13px;color:var(--ink-400);margin-top:16px;text-align:center;}

/* ---------- Buttons ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  height:46px;padding:0 24px;border-radius:999px;font-size:15px;font-weight:600;
  border:1px solid transparent;cursor:pointer;white-space:nowrap;font-family:inherit;
  transition:background var(--t),color var(--t),border-color var(--t),transform var(--t),box-shadow var(--t);
}
.btn-sm{height:40px;padding:0 20px;font-size:14px;}
.btn-primary{background:var(--brand);color:#fff;box-shadow:0 8px 20px rgba(58,107,255,.28);}
.btn-primary:hover{background:var(--brand-700);transform:translateY(-1px);box-shadow:0 10px 26px rgba(58,107,255,.36);}
.btn-primary:active{transform:translateY(0);box-shadow:0 4px 12px rgba(58,107,255,.28);}
.btn-ghost{border-color:var(--line);color:var(--ink-900);background:#fff;}
.btn-ghost:hover{background:var(--brand-50);border-color:var(--brand);color:var(--brand);transform:translateY(-1px);}
.btn-outline-light{border-color:rgba(255,255,255,.35);color:rgba(255,255,255,.92);background:rgba(255,255,255,.04);}
.btn-outline-light:hover{background:rgba(255,255,255,.10);border-color:rgba(255,255,255,.6);transform:translateY(-1px);}
.btn-glow{
  background:rgba(33,230,193,.14);color:var(--glow);
  border:1px solid rgba(33,230,193,.5);
  box-shadow:0 0 0 1px rgba(33,230,193,.10),0 0 22px rgba(33,230,193,.18);
}
.btn-glow:hover{background:rgba(33,230,193,.22);box-shadow:0 0 24px rgba(33,230,193,.35);transform:translateY(-1px);}
.btn-glow:active{transform:translateY(0);}
.btn:disabled{opacity:.4;cursor:not-allowed;transform:none;box-shadow:none;}
.btn:focus-visible{outline:2px solid var(--brand);outline-offset:2px;}
.on-dark .btn:focus-visible,.page-hero .btn:focus-visible,.cta-band .btn:focus-visible{outline:2px solid var(--glow);outline-offset:2px;}

/* ---------- Badges / tags ---------- */
.badge{
  display:inline-flex;align-items:center;gap:6px;height:26px;padding:0 12px;border-radius:999px;
  font-size:13px;line-height:1.5;font-weight:500;
  background:var(--brand-50);color:var(--brand);
}
.badge-dark{background:rgba(255,255,255,.10);color:rgba(255,255,255,.86);border:1px solid rgba(255,255,255,.16);}
.tag{
  display:inline-flex;align-items:center;height:24px;padding:0 10px;border-radius:999px;
  font-size:13px;line-height:1.5;background:var(--paper-2);color:var(--ink-600);border:1px solid var(--line);
}
.tag-brand{background:var(--brand-50);color:var(--brand);border-color:transparent;}
.tag-glow{background:rgba(33,230,193,.12);color:var(--glow-ink);border-color:transparent;}

/* ---------- Page hero ---------- */
.page-hero{
  position:relative;color:#fff;background-color:var(--bg-900);
  background-image:linear-gradient(140deg,rgba(6,10,24,.80) 0%,rgba(6,10,24,.60) 42%,rgba(6,10,24,.94) 100%),
    url('/assets/images/backpic/back-2.png');
  background-size:cover;background-position:center;
  border-bottom:1px solid rgba(255,255,255,.08);
}
.hero-inner{
  position:relative;z-index:2;min-height:320px;padding:32px 0 60px;
  display:flex;flex-direction:column;justify-content:center;
}
.breadcrumb{display:flex;align-items:center;gap:8px;font-size:13px;color:rgba(255,255,255,.58);margin-bottom:24px;}
.breadcrumb a{color:rgba(255,255,255,.58);transition:color var(--t);}
.breadcrumb a:hover{color:var(--glow);}
.breadcrumb .crumb-current{color:rgba(255,255,255,.88);}
.hero-inner h1{
  font-size:clamp(30px,4vw,46px);line-height:1.15;font-weight:700;
  letter-spacing:.01em;margin:16px 0 14px;color:#fff;max-width:820px;
}
.hero-lead{font-size:18px;line-height:1.75;color:rgba(255,255,255,.78);max-width:640px;}
.hero-actions{display:flex;flex-wrap:wrap;gap:14px;margin-top:28px;}
.hero-stats{display:flex;flex-wrap:wrap;gap:28px;margin-top:32px;padding-top:24px;border-top:1px solid rgba(255,255,255,.12);}
.hero-stat strong{display:block;font-size:22px;font-weight:600;color:#fff;font-variant-numeric:tabular-nums;letter-spacing:.02em;}
.hero-stat span{display:block;font-size:13px;color:rgba(255,255,255,.58);}
@media (max-width:1023px){
  .hero-inner{min-height:280px;padding:24px 0 48px;}
}
@media (max-width:767px){
  .hero-inner{min-height:220px;padding:20px 0 40px;}
  .hero-lead{font-size:16px;}
  .hero-actions{gap:12px;}
  .hero-actions .btn{width:100%;}
  .hero-stats{gap:18px;margin-top:26px;}
  .hero-stat strong{font-size:19px;}
}

/* ---------- Sections ---------- */
.section{padding:96px 0;}
.section-alt{background:var(--paper-2);}
.section-head{max-width:760px;margin-bottom:40px;}
.section-head.center{margin-left:auto;margin-right:auto;text-align:center;}
.eyebrow{
  display:inline-block;font-size:13px;font-weight:600;letter-spacing:.16em;
  color:var(--brand);margin-bottom:12px;text-transform:uppercase;
}
.section-title{font-size:clamp(24px,2.6vw,34px);line-height:1.25;font-weight:600;color:var(--ink-900);margin-bottom:12px;}
.section-sub{font-size:16px;line-height:1.8;color:var(--ink-600);}
@media (max-width:1023px){.section{padding:72px 0;}.section-head{margin-bottom:32px;}}
@media (max-width:767px){.section{padding:56px 0;}.section-sub{font-size:15px;}}

/* ---------- Media card grid ---------- */
.card-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:24px;}
.media-card{
  display:flex;flex-direction:column;background:#fff;border:1px solid var(--line);
  border-radius:var(--radius);overflow:hidden;height:100%;
  transition:transform var(--t),box-shadow var(--t),border-color var(--t);
}
.media-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-2);border-color:#D9E1F2;}
.media-card .thumb{
  aspect-ratio:16/9;overflow:hidden;background:linear-gradient(135deg,#3A6BFF,#0B1226);
}
.media-card .thumb img{
  width:100%;height:100%;object-fit:cover;
  transition:transform 420ms var(--ease);
}
.media-card:hover .thumb img{transform:scale(1.04);}
.media-card .card-body{padding:20px 22px 22px;display:flex;flex-direction:column;gap:10px;flex:1;}
.card-title{font-size:19px;line-height:1.45;font-weight:600;color:var(--ink-900);}
.media-card:hover .card-title{color:var(--brand);}
.card-desc{font-size:15px;line-height:1.75;color:var(--ink-600);}
.tag-row{display:flex;flex-wrap:wrap;gap:8px;}
.card-more{
  margin-top:auto;font-size:14px;font-weight:600;color:var(--brand);
  display:inline-flex;align-items:center;gap:6px;transition:gap var(--t);
}
.media-card:hover .card-more{gap:10px;}
@media (max-width:767px){.card-grid{grid-template-columns:minmax(0,1fr);gap:18px;}}

/* ---------- Steps ---------- */
.steps-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:22px;}
.step-card{
  position:relative;background:#fff;border:1px solid var(--line);border-radius:var(--radius);
  padding:26px 22px 24px;transition:transform var(--t),box-shadow var(--t),border-color var(--t);
}
.step-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-1);border-color:#D9E1F2;}
.step-num{
  display:inline-flex;align-items:center;justify-content:center;
  width:38px;height:38px;border-radius:12px;font-size:15px;font-weight:700;
  color:var(--brand);background:var(--brand-50);font-variant-numeric:tabular-nums;margin-bottom:16px;
}
.step-card h3{font-size:17px;line-height:1.5;font-weight:600;color:var(--ink-900);margin-bottom:8px;}
.step-card p{font-size:15px;line-height:1.75;color:var(--ink-600);}
@media (max-width:1023px){.steps-grid{grid-template-columns:repeat(2,minmax(0,1fr));}}
@media (max-width:600px){.steps-grid{grid-template-columns:minmax(0,1fr);}}

/* ---------- Risk list ---------- */
.risk-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:20px;}
.risk-item{
  display:flex;gap:14px;background:#fff;border:1px solid var(--line);border-radius:var(--radius-sm);
  padding:20px;transition:border-color var(--t),box-shadow var(--t),transform var(--t);
}
.risk-item:hover{border-color:rgba(58,107,255,.45);box-shadow:var(--shadow-1);transform:translateY(-3px);}
.risk-ico{
  flex-shrink:0;width:36px;height:36px;border-radius:10px;display:flex;align-items:center;justify-content:center;
  background:rgba(255,122,61,.10);color:var(--amber);
}
.risk-item h3{font-size:16px;font-weight:600;color:var(--ink-900);margin-bottom:6px;line-height:1.5;}
.risk-item p{font-size:14px;line-height:1.7;color:var(--ink-600);}
@media (max-width:1023px){.risk-grid{grid-template-columns:repeat(2,minmax(0,1fr));}}
@media (max-width:600px){.risk-grid{grid-template-columns:minmax(0,1fr);}}

/* ---------- Split feature ---------- */
.split{display:grid;grid-template-columns:1fr 1fr;gap:48px;align-items:center;}
.split-media{
  border-radius:var(--radius-lg);overflow:hidden;border:1px solid var(--line);
  box-shadow:var(--shadow-1);background:linear-gradient(135deg,#3A6BFF,#0B1226);aspect-ratio:4/3;
}
.split-media img{width:100%;height:100%;object-fit:cover;}
.check-list{display:flex;flex-direction:column;gap:16px;margin-top:24px;}
.check-list li{display:flex;gap:12px;font-size:15px;line-height:1.75;color:var(--ink-600);}
.check-ico{
  flex-shrink:0;margin-top:4px;width:20px;height:20px;border-radius:50%;
  display:flex;align-items:center;justify-content:center;background:rgba(33,230,193,.16);color:var(--glow-ink);
}
.split .btn{margin-top:28px;}
@media (max-width:900px){
  .split{grid-template-columns:minmax(0,1fr);gap:28px;}
  .split-media{order:-1;}
}

/* ---------- FAQ ---------- */
.faq-wrap{max-width:880px;}
.faq-item{
  background:#fff;border:1px solid var(--line);border-radius:var(--radius-sm);
  margin-bottom:12px;overflow:hidden;transition:border-color var(--t),box-shadow var(--t);
}
.faq-item:hover{border-color:rgba(58,107,255,.5);}
.faq-item.is-open{border-color:rgba(58,107,255,.5);box-shadow:var(--shadow-1);}
.faq-q{
  width:100%;display:flex;align-items:center;justify-content:space-between;gap:16px;
  padding:18px 20px;background:transparent;border:0;cursor:pointer;text-align:left;
  font-size:17px;font-weight:600;line-height:1.5;color:var(--ink-900);
  transition:color var(--t);
}
.faq-q:hover{color:var(--brand);}
.faq-ico{
  flex-shrink:0;width:24px;height:24px;border-radius:50%;display:flex;align-items:center;justify-content:center;
  border:1px solid var(--line);color:var(--brand);transition:transform var(--t),background var(--t),border-color var(--t);
}
.faq-item.is-open .faq-ico{transform:rotate(180deg);background:var(--brand-50);border-color:transparent;}
.faq-a{display:grid;grid-template-rows:0fr;transition:grid-template-rows 240ms var(--ease);}
.faq-item.is-open .faq-a{grid-template-rows:1fr;}
.faq-a > div{overflow:hidden;}
.faq-a p{padding:0 20px 20px;font-size:15.5px;line-height:1.8;color:var(--ink-600);}
@media (max-width:600px){.faq-q{font-size:16px;padding:16px;}.faq-a p{padding:0 16px 18px;font-size:15px;}}

/* ---------- Related categories ---------- */
.cat-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:22px;}
.cat-card{
  display:flex;flex-direction:column;gap:10px;padding:26px 24px;
  background:#fff;border:1px solid var(--line);border-radius:var(--radius);
  transition:transform var(--t),box-shadow var(--t),border-color var(--t);
}
.cat-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-2);border-color:rgba(58,107,255,.4);}
.cat-card h3{font-size:18px;font-weight:600;color:var(--ink-900);}
.cat-card p{font-size:15px;line-height:1.75;color:var(--ink-600);}
.cat-card .cat-link{margin-top:auto;font-size:14px;font-weight:600;color:var(--brand);display:inline-flex;align-items:center;gap:6px;transition:gap var(--t);}
.cat-card:hover .cat-link{gap:10px;}
@media (max-width:1023px){.cat-grid{grid-template-columns:repeat(2,minmax(0,1fr));}}
@media (max-width:640px){.cat-grid{grid-template-columns:minmax(0,1fr);}}

/* ---------- CTA band ---------- */
.cta-band{background:var(--bg-900);color:#fff;position:relative;overflow:hidden;}
.cta-band::after{
  content:"";position:absolute;right:-120px;top:-120px;width:420px;height:420px;border-radius:50%;
  background:radial-gradient(circle,rgba(33,230,193,.16) 0%,rgba(33,230,193,0) 68%);
}
.cta-band-inner{
  position:relative;z-index:2;display:flex;align-items:center;justify-content:space-between;gap:36px;
  padding:64px 0;
}
.cta-band h2{font-size:clamp(22px,2.4vw,30px);line-height:1.3;font-weight:600;color:#fff;margin-bottom:10px;}
.cta-band p{font-size:16px;line-height:1.8;color:rgba(255,255,255,.66);max-width:620px;}
.cta-actions{display:flex;gap:14px;flex-shrink:0;}
@media (max-width:900px){
  .cta-band-inner{flex-direction:column;align-items:flex-start;padding:48px 0;gap:24px;}
  .cta-actions{width:100%;flex-direction:column;}
  .cta-actions .btn{width:100%;}
}

/* ---------- Footer ---------- */
.site-footer{background:var(--bg-900);color:rgba(255,255,255,.6);border-top:1px solid rgba(255,255,255,.08);}
.footer-grid{
  display:grid;grid-template-columns:1.6fr 1fr 1fr 1fr;gap:40px;padding:68px 0 48px;
}
.brand-footer{margin-bottom:18px;}
.brand-footer .brand-copy strong{color:#fff;}
.brand-footer .brand-copy small{color:rgba(255,255,255,.5);}
.footer-brand p{font-size:14px;line-height:1.8;max-width:340px;}
.footer-contact{margin-top:12px;color:rgba(255,255,255,.72) !important;}
.footer-col h4{font-size:15px;font-weight:600;color:#fff;margin-bottom:16px;}
.footer-col ul{display:flex;flex-direction:column;gap:10px;}
.footer-col a{font-size:14px;color:rgba(255,255,255,.6);transition:color var(--t);}
.footer-col a:hover{color:var(--glow);}
.footer-bottom{border-top:1px solid rgba(255,255,255,.08);}
.footer-bottom-inner{
  display:flex;align-items:center;justify-content:space-between;gap:16px;
  padding:20px 32px;font-size:13px;color:rgba(255,255,255,.45);
}
@media (max-width:1023px){
  .footer-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:32px;padding:52px 0 36px;}
}
@media (max-width:640px){
  .footer-grid{grid-template-columns:minmax(0,1fr);}
  .footer-bottom-inner{flex-direction:column;align-items:flex-start;padding:18px 20px;gap:6px;}
}

/* ---------- Back to top ---------- */
.to-top{
  position:fixed;right:20px;bottom:24px;z-index:70;width:44px;height:44px;border-radius:50%;
  display:flex;align-items:center;justify-content:center;cursor:pointer;
  background:rgba(6,10,24,.92);color:var(--glow);border:1px solid rgba(33,230,193,.55);
  opacity:0;visibility:hidden;transform:translateY(10px);
  transition:opacity var(--t),transform var(--t),visibility var(--t),box-shadow var(--t);
}
.to-top.is-visible{opacity:1;visibility:visible;transform:translateY(0);}
.to-top:hover{box-shadow:0 0 24px rgba(33,230,193,.35);}

/* roulang page: category4 */
:root{
  --bg-900:#060A18;
  --bg-800:#0B1226;
  --brand:#3A6BFF;
  --brand-700:#2A50D6;
  --glow:#21E6C1;
  --glow-ink:#0E9C84;
  --ink-900:#101828;
  --ink-600:#475467;
  --ink-400:#98A2B3;
  --line:#E5E9F2;
  --line-soft:#EEF1F6;
  --paper:#FFFFFF;
  --paper-2:#F6F8FC;
  --amber:#FF7A3D;
  --danger:#FF6B6B;
  --r-lg:20px;
  --r-md:16px;
  --r-sm:12px;
  --r-pill:999px;
  --sh-1:0 1px 2px rgba(16,24,40,.04),0 8px 24px rgba(16,24,40,.06);
  --sh-2:0 12px 32px rgba(16,24,40,.10);
  --sh-glass:0 0 0 1px rgba(255,255,255,.10),0 18px 40px rgba(0,0,0,.35);
  --ease:cubic-bezier(.22,.61,.36,1);
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  margin:0;
  font-family:"PingFang SC","HarmonyOS Sans SC","Source Han Sans SC","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",sans-serif;
  font-size:16px;
  line-height:1.85;
  color:var(--ink-900);
  background:var(--paper);
  overflow-x:hidden;
  -webkit-font-smoothing:antialiased;
}
body.drawer-open{overflow:hidden}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
button{font-family:inherit}
h1,h2,h3,h4{margin:0;letter-spacing:.01em;color:var(--ink-900)}
p{margin:0}
ul{margin:0;padding:0;list-style:none}
strong{font-weight:600}
:focus-visible{outline:2px solid var(--brand);outline-offset:2px;border-radius:4px}
.container{width:100%;max-width:1200px;margin:0 auto;padding:0 20px}
@media(min-width:768px){.container{padding:0 32px}}
@media(min-width:1280px){.container{max-width:1280px}}

/* ---------- header / nav ---------- */
.site-header{
  position:sticky;top:0;z-index:50;
  background:rgba(255,255,255,.96);
  backdrop-filter:saturate(180%) blur(8px);
  border-bottom:1px solid #E9EDF5;
  transition:box-shadow .22s var(--ease);
}
.site-header.is-scrolled{box-shadow:0 4px 16px rgba(16,24,40,.08)}
.header-inner{
  display:flex;align-items:center;gap:24px;
  height:68px;
}
.brand{display:flex;align-items:center;gap:10px;flex-shrink:0}
.brand-mark{
  width:34px;height:34px;border-radius:10px;
  display:flex;align-items:center;justify-content:center;
  background:linear-gradient(135deg,#4C7BFF,#2A50D6);
  box-shadow:0 6px 16px rgba(58,107,255,.30);
  flex-shrink:0;
}
.brand-copy{display:flex;flex-direction:column;line-height:1.2}
.brand-copy strong{font-size:17px;font-weight:600;color:var(--ink-900);letter-spacing:.01em}
.brand-copy small{font-size:12px;color:#667085;margin-top:2px;letter-spacing:.01em}
.main-nav{display:none;align-items:center;gap:30px;margin-left:8px}
.nav-link{
  position:relative;font-size:15px;color:var(--ink-600);
  padding:6px 0;transition:color .2s var(--ease),transform .2s var(--ease);
}
.nav-link::after{
  content:"";position:absolute;left:0;right:0;bottom:-4px;height:2px;border-radius:2px;
  background:var(--brand);transform:scaleX(0);transform-origin:left;
  transition:transform .22s var(--ease);
}
.nav-link:hover{color:var(--brand);transform:translateY(1px)}
.nav-link.is-active{color:var(--brand);font-weight:600}
.nav-link.is-active::after{transform:scaleX(1)}
.header-actions{margin-left:auto;display:flex;align-items:center;gap:12px}
.search-box{display:none;align-items:center;gap:8px;height:40px;padding:0 16px;border-radius:var(--r-pill);background:#F2F5FA;border:1px solid var(--line);transition:border-color .2s var(--ease),box-shadow .2s var(--ease)}
.search-box:focus-within{border-color:var(--brand);box-shadow:0 0 0 2px rgba(58,107,255,.22)}
.search-box input{border:0;background:transparent;outline:none;font-size:14px;color:var(--ink-900);width:132px}
.search-box input::placeholder{color:var(--ink-400)}
.search-box svg{flex-shrink:0;opacity:.6}
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  height:46px;padding:0 24px;border-radius:var(--r-pill);
  font-size:15px;font-weight:600;border:1px solid transparent;cursor:pointer;
  transition:transform .2s var(--ease),box-shadow .2s var(--ease),background-color .2s var(--ease),border-color .2s var(--ease),color .2s var(--ease),filter .2s var(--ease);
}
.btn:disabled{opacity:.4;cursor:not-allowed}
.btn-primary{background:var(--brand);color:#fff}
.btn-primary:hover{background:var(--brand-700);transform:translateY(-1px);box-shadow:0 8px 24px rgba(58,107,255,.35)}
.btn-primary:active{transform:translateY(0);background:#2445BC}
.btn-cta{height:40px;padding:0 20px;font-size:14px;background:var(--brand);color:#fff}
.btn-cta:hover{background:var(--brand-700);transform:translateY(-1px);box-shadow:0 8px 20px rgba(58,107,255,.32)}
.btn-glow{
  background:rgba(33,230,193,.14);color:#9DF7E6;border-color:rgba(33,230,193,.45);
  box-shadow:0 0 0 1px rgba(33,230,193,.18);
  height:48px;padding:0 26px;
}
.btn-glow:hover{background:rgba(33,230,193,.22);box-shadow:0 0 24px rgba(33,230,193,.35);transform:translateY(-1px);color:#DFFFF7}
.btn-outline-light{backgroundColor:transparent;color:rgba(255,255,255,.88);border-color:rgba(255,255,255,.36);height:48px;padding:0 26px}
.btn-outline-light:hover{background:rgba(255,255,255,.10);border-color:rgba(255,255,255,.6);color:#fff;transform:translateY(-1px)}
.btn-outline{background:transparent;color:var(--brand);border-color:rgba(58,107,255,.42)}
.btn-outline:hover{background:rgba(58,107,255,.08);border-color:var(--brand);transform:translateY(-1px)}
.nav-toggle{
  width:44px;height:44px;border-radius:12px;border:1px solid var(--line);
  background:#fff;display:flex;align-items:center;justify-content:center;cursor:pointer;
  transition:background-color .2s var(--ease),border-color .2s var(--ease);
}
.nav-toggle:hover{background:var(--paper-2);border-color:#D6DDEA}
.nav-toggle span{display:block;width:18px;height:2px;background:var(--ink-900);border-radius:2px;position:relative}
.nav-toggle span::before,.nav-toggle span::after{content:"";position:absolute;left:0;width:18px;height:2px;background:var(--ink-900);border-radius:2px}
.nav-toggle span::before{top:-6px}
.nav-toggle span::after{top:6px}
.mobile-drawer{
  position:fixed;left:0;right:0;top:0;bottom:0;background:#fff;z-index:60;
  padding:20px;transform:translateY(-100%);opacity:0;pointer-events:none;
  transition:transform .28s var(--ease),opacity .24s var(--ease);
  overflow-y:auto;
}
.mobile-drawer.open{transform:translateY(0);opacity:1;pointer-events:auto}
.drawer-head{display:flex;align-items:center;justify-content:space-between;height:44px;margin-bottom:18px}
.drawer-close{width:44px;height:44px;border-radius:12px;border:1px solid var(--line);background:#fff;font-size:20px;color:var(--ink-600);cursor:pointer;line-height:1}
.drawer-close:hover{background:var(--paper-2);color:var(--ink-900)}
.drawer-nav{display:flex;flex-direction:column;gap:2px;margin-bottom:20px}
.drawer-nav a{padding:14px 12px;border-radius:12px;font-size:16px;color:var(--ink-600);border-bottom:1px solid var(--line-soft)}
.drawer-nav a:hover{background:var(--paper-2);color:var(--brand)}
.drawer-nav a.is-active{color:var(--brand);font-weight:600;background:rgba(58,107,255,.06)}
.drawer-search{display:flex;align-items:center;gap:8px;height:48px;padding:0 16px;border-radius:var(--r-pill);background:#F2F5FA;border:1px solid var(--line);margin-bottom:16px}
.drawer-search input{border:0;background:transparent;outline:none;font-size:15px;width:100%}
.drawer-cta{width:100%;height:48px}
@media(min-width:1024px){
  .main-nav{display:flex}
  .search-box{display:flex}
  .nav-toggle{display:none}
  .mobile-drawer{display:none}
}

/* ---------- page kv ---------- */
.page-kv{
  position:relative;color:#fff;overflow:hidden;
  min-height:300px;
  background-color:var(--bg-900);
  background-image:
    radial-gradient(720px 320px at 82% 8%, rgba(33,230,193,.16), transparent 62%),
    radial-gradient(560px 300px at 6% 96%, rgba(58,107,255,.22), transparent 66%),
    linear-gradient(120deg, rgba(6,10,24,.72) 0%, rgba(6,10,24,.90) 58%, rgba(6,10,24,.96) 100%),
    url('/assets/images/backpic/back-3.png');
  background-size:cover,cover,cover,cover;
  background-position:center,center,center,center right;
}
.kv-inner{padding:32px 0 44px;position:relative;z-index:2}
.breadcrumb{display:flex;align-items:center;gap:8px;font-size:13px;color:rgba(255,255,255,.62);margin-bottom:20px}
.breadcrumb a{color:rgba(255,255,255,.72);transition:color .2s var(--ease)}
.breadcrumb a:hover{color:var(--glow)}
.breadcrumb .current{color:rgba(255,255,255,.92)}
.page-kv h1{
  font-size:clamp(28px,4.4vw,46px);line-height:1.16;font-weight:700;color:#fff;
  max-width:760px;letter-spacing:.01em;
}
.kv-sub{margin-top:14px;font-size:18px;line-height:1.7;color:rgba(255,255,255,.78);max-width:640px}
.kv-actions{display:flex;flex-wrap:wrap;gap:14px;margin-top:26px}
.kv-meta{
  display:flex;flex-wrap:wrap;gap:26px;margin-top:32px;padding-top:22px;
  border-top:1px solid rgba(255,255,255,.10);
  font-variant-numeric:tabular-nums;
}
.kv-meta>div{display:flex;flex-direction:column;gap:2px;padding-right:26px;border-right:1px solid rgba(255,255,255,.12)}
.kv-meta>div:last-child{border-right:0;padding-right:0}
.kv-meta strong{font-size:19px;font-weight:600;color:#fff;letter-spacing:.02em}
.kv-meta span{font-size:13px;color:rgba(255,255,255,.62)}

/* ---------- sections ---------- */
.section{padding:56px 0}
.section-tight{padding:48px 0}
.section-alt{background:var(--paper-2)}
.section-dark{background:var(--bg-900);color:rgba(255,255,255,.86)}
@media(min-width:768px){.section{padding:72px 0}.section-tight{padding:64px 0}}
@media(min-width:1024px){.section{padding:96px 0}.section-tight{padding:80px 0}}
.section-head{max-width:720px;margin-bottom:34px}
.eyebrow{
  display:inline-block;font-size:13px;font-weight:600;letter-spacing:.14em;
  color:var(--brand);text-transform:uppercase;margin-bottom:12px;
}
.section-head h2{font-size:clamp(23px,2.6vw,33px);line-height:1.26;font-weight:600}
.section-head p{margin-top:12px;font-size:16px;color:var(--ink-600);line-height:1.8}
.section-dark .eyebrow{color:var(--glow)}
.section-dark .section-head h2{color:#fff}
.section-dark .section-head p{color:rgba(255,255,255,.66)}

/* ---------- channel cards ---------- */
.channel-grid{display:grid;grid-template-columns:1fr;gap:20px}
@media(min-width:640px){.channel-grid{grid-template-columns:repeat(2,1fr)}}
@media(min-width:1024px){.channel-grid{grid-template-columns:repeat(4,1fr)}}
.channel-card{
  position:relative;background:#fff;border:1px solid var(--line);border-radius:var(--r-md);
  padding:26px 22px 24px;box-shadow:var(--sh-1);
  display:flex;flex-direction:column;gap:12px;
  transition:transform .22s var(--ease),box-shadow .22s var(--ease),border-color .22s var(--ease);
  overflow:hidden;
}
.channel-card::before{
  content:"";position:absolute;inset:0 0 auto 0;height:3px;
  background:linear-gradient(90deg,var(--brand),var(--glow));opacity:.85;
}
.channel-card:hover{transform:translateY(-4px);box-shadow:var(--sh-2);border-color:#D8E0F2}
.channel-icon{
  width:44px;height:44px;border-radius:14px;display:flex;align-items:center;justify-content:center;
  background:linear-gradient(140deg,rgba(58,107,255,.14),rgba(33,230,193,.14));
  color:var(--brand-700);
}
.channel-card h3{font-size:19px;font-weight:600;line-height:1.45}
.channel-card p{font-size:15px;color:var(--ink-600);line-height:1.78}
.channel-tag{
  align-self:flex-start;font-size:13px;padding:4px 12px;border-radius:var(--r-pill);
  background:rgba(58,107,255,.08);color:var(--brand-700);
}
.channel-tag.warm{background:rgba(255,122,61,.12);color:#C4551F}
.channel-tag.mint{background:rgba(33,230,193,.16);color:var(--glow-ink)}
.channel-link{margin-top:auto;font-size:14px;font-weight:600;color:var(--brand);display:inline-flex;align-items:center;gap:6px}
.channel-link span{transition:transform .2s var(--ease)}
.channel-link:hover span{transform:translateX(4px)}

/* ---------- timeline ---------- */
.timeline{position:relative;padding-left:28px}
.timeline::before{
  content:"";position:absolute;left:5px;top:6px;bottom:6px;width:4px;border-radius:4px;
  background:linear-gradient(180deg,var(--brand),var(--glow),rgba(33,230,193,0));
}
.tl-item{position:relative;padding:0 0 30px 22px}
.tl-item:last-child{padding-bottom:0}
.tl-item::before{
  content:"";position:absolute;left:-28px;top:7px;width:12px;height:12px;border-radius:50%;
  background:#fff;border:3px solid var(--brand);box-shadow:0 0 0 4px rgba(58,107,255,.10);
}
.tl-item.is-start::before{background:var(--glow);border-color:var(--glow);box-shadow:0 0 0 4px rgba(33,230,193,.18)}
.tl-time{font-size:14px;font-weight:600;color:var(--brand-700);font-variant-numeric:tabular-nums;letter-spacing:.02em}
.tl-item h3{font-size:19px;font-weight:600;margin-top:6px;line-height:1.5}
.tl-item p{font-size:15px;color:var(--ink-600);line-height:1.8;margin-top:6px;max-width:640px}
.tl-tags{display:flex;gap:8px;flex-wrap:wrap;margin-top:10px}
.tl-tags span{font-size:13px;padding:3px 11px;border-radius:var(--r-pill);background:var(--paper-2);color:var(--ink-600);border:1px solid var(--line)}
@media(min-width:1024px){
  .timeline{padding-left:34px}
  .timeline::before{left:6px}
  .tl-item{padding-left:30px;padding-bottom:34px}
  .tl-item::before{left:-34px}
}

/* ---------- prep list ---------- */
.prep-grid{display:grid;grid-template-columns:1fr;gap:14px}
@media(min-width:640px){.prep-grid{grid-template-columns:repeat(2,1fr)}}
@media(min-width:1024px){.prep-grid{grid-template-columns:repeat(3,1fr)}}
.prep-item{
  display:flex;gap:14px;align-items:flex-start;background:#fff;border:1px solid var(--line);
  border-radius:var(--r-sm);padding:18px 18px;transition:border-color .2s var(--ease),transform .2s var(--ease);
}
.prep-item:hover{border-color:rgba(58,107,255,.4);transform:translateY(-2px)}
.prep-num{
  flex-shrink:0;width:28px;height:28px;border-radius:9px;display:flex;align-items:center;justify-content:center;
  background:rgba(58,107,255,.10);color:var(--brand-700);font-size:13px;font-weight:600;
  font-variant-numeric:tabular-nums;
}
.prep-item h4{font-size:16px;font-weight:600;line-height:1.5}
.prep-item p{font-size:14px;color:var(--ink-600);line-height:1.75;margin-top:4px}

/* ---------- FAQ ---------- */
.faq-shell{max-width:860px;margin:0 auto}
.faq-list{display:flex;flex-direction:column;gap:12px}
.faq-item{
  background:#fff;border:1px solid var(--line);border-radius:var(--r-sm);
  transition:border-color .2s var(--ease),box-shadow .2s var(--ease);
  overflow:hidden;
}
.faq-item:hover{border-color:rgba(58,107,255,.42)}
.faq-item.open{border-color:rgba(58,107,255,.5);box-shadow:0 10px 28px rgba(16,24,40,.07)}
.faq-q{
  width:100%;display:flex;align-items:flex-start;justify-content:space-between;gap:16px;
  background:transparent;border:0;text-align:left;cursor:pointer;
  padding:18px 20px;font-size:17px;font-weight:600;color:var(--ink-900);line-height:1.55;
}
.faq-q:hover{color:var(--brand-700)}
.faq-mark{
  flex-shrink:0;width:26px;height:26px;border-radius:50%;border:1px solid var(--line);
  display:flex;align-items:center;justify-content:center;color:var(--brand);
  transition:transform .26s var(--ease),background-color .2s var(--ease),border-color .2s var(--ease);
  position:relative;margin-top:2px;
}
.faq-mark::before,.faq-mark::after{content:"";position:absolute;background:currentColor;border-radius:2px}
.faq-mark::before{width:11px;height:1.6px}
.faq-mark::after{width:1.6px;height:11px;transition:opacity .2s var(--ease)}
.faq-item.open .faq-mark{background:rgba(33,230,193,.16);border-color:rgba(33,230,193,.5);color:var(--glow-ink)}
.faq-item.open .faq-mark::after{opacity:0}
.faq-a{display:grid;grid-template-rows:0fr;transition:grid-template-rows .28s var(--ease)}
.faq-item.open .faq-a{grid-template-rows:1fr}
.faq-a>div{overflow:hidden}
.faq-a p{
  padding:0 20px 20px;font-size:15.5px;line-height:1.85;color:var(--ink-600);
}
.faq-a p+p{margin-top:-8px}

/* ---------- CTA band ---------- */
.cta-band{
  background:var(--bg-900);
  background-image:
    radial-gradient(600px 260px at 88% 12%, rgba(33,230,193,.14), transparent 64%),
    radial-gradient(520px 260px at 4% 100%, rgba(58,107,255,.20), transparent 66%);
  border-top:1px solid rgba(255,255,255,.08);
  border-bottom:1px solid rgba(255,255,255,.08);
  padding:48px 0;
}
.cta-inner{display:flex;flex-direction:column;gap:22px}
.cta-inner h2{font-size:clamp(21px,2.4vw,28px);line-height:1.35;color:#fff;font-weight:600}
.cta-inner p{margin-top:10px;font-size:15.5px;color:rgba(255,255,255,.68);max-width:560px;line-height:1.8}
.cta-actions{display:flex;flex-wrap:wrap;gap:14px}
@media(min-width:1024px){
  .cta-inner{flex-direction:row;align-items:center;justify-content:space-between;gap:40px}
  .cta-copy{max-width:640px}
}

/* ---------- footer ---------- */
.site-footer{background:var(--bg-900);color:rgba(255,255,255,.6);border-top:1px solid rgba(255,255,255,.08);padding-top:56px}
.footer-grid{display:grid;grid-template-columns:1fr;gap:34px;padding-bottom:44px}
@media(min-width:640px){.footer-grid{grid-template-columns:repeat(2,1fr)}}
@media(min-width:1024px){.footer-grid{grid-template-columns:2fr 1fr 1fr 1fr;gap:40px}}
.brand-footer{margin-bottom:16px}
.brand-footer .brand-copy strong{color:#fff}
.brand-footer .brand-copy small{color:rgba(255,255,255,.55)}
.footer-brand p{font-size:14.5px;line-height:1.85;color:rgba(255,255,255,.6);max-width:360px}
.footer-contact{margin-top:12px;font-size:14px;color:rgba(255,255,255,.72)}
.footer-col h4{font-size:15px;font-weight:600;color:#fff;margin-bottom:16px}
.footer-col ul{display:flex;flex-direction:column;gap:11px}
.footer-col a{font-size:14.5px;color:rgba(255,255,255,.6);transition:color .2s var(--ease),transform .2s var(--ease);display:inline-block}
.footer-col a:hover{color:var(--glow);transform:translateX(3px)}
.footer-bottom{border-top:1px solid rgba(255,255,255,.08);padding:20px 0}
.footer-bottom-inner{display:flex;flex-direction:column;gap:8px;font-size:13.5px;color:rgba(255,255,255,.5)}
@media(min-width:768px){.footer-bottom-inner{flex-direction:row;align-items:center;justify-content:space-between}}

/* ---------- back to top ---------- */
.back-top{
  position:fixed;right:20px;bottom:24px;width:44px;height:44px;border-radius:50%;
  background:var(--bg-800);border:1px solid rgba(33,230,193,.5);color:var(--glow);
  display:flex;align-items:center;justify-content:center;cursor:pointer;z-index:40;
  opacity:0;pointer-events:none;transform:translateY(10px);
  transition:opacity .24s var(--ease),transform .24s var(--ease),box-shadow .24s var(--ease);
}
.back-top.show{opacity:1;pointer-events:auto;transform:translateY(0)}
.back-top:hover{box-shadow:0 0 22px rgba(33,230,193,.35);background:#0E1730}