/* roulang page: index */
:root{
  --bg-0:#05070F;
  --bg-1:#0A1020;
  --panel:rgba(18,26,44,.62);
  --brand-300:#7EA8FF;
  --brand-500:#3D7BFF;
  --brand-700:#1B4BD8;
  --accent:#1FE0B0;
  --warn:#FF9A2E;
  --text-1:#E8EEFA;
  --text-2:#A7B4CC;
  --text-3:#6B7A99;
  --line:rgba(120,160,255,.14);
  --glow:0 0 0 1px rgba(61,123,255,.35), 0 8px 30px rgba(31,90,255,.28);
  --glow-strong:0 0 0 1px rgba(61,123,255,.55), 0 12px 40px rgba(31,90,255,.45);
  --shadow-card:0 10px 30px rgba(0,0,0,.35);
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  background:var(--bg-0);
  color:var(--text-1);
  font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei","Noto Sans SC",sans-serif;
  font-size:16px;
  line-height:1.75;
  letter-spacing:0;
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
ul{margin:0;padding:0;list-style:none}
h1,h2,h3,h4,p{margin:0}
:focus-visible{outline:2px solid var(--accent);outline-offset:2px;border-radius:6px}

.container-x{width:100%;max-width:1200px;margin:0 auto;padding-left:16px;padding-right:16px}
@media(min-width:768px){.container-x{padding-left:24px;padding-right:24px}}
@media(min-width:1024px){.container-x{padding-left:32px;padding-right:32px}}

.sec{padding-top:56px;padding-bottom:56px}
@media(min-width:768px){.sec{padding-top:72px;padding-bottom:72px}}
@media(min-width:1024px){.sec{padding-top:96px;padding-bottom:96px}}

.num{font-variant-numeric:tabular-nums}

.glass{
  background:var(--panel);
  backdrop-filter:blur(14px);
  -webkit-backdrop-filter:blur(14px);
  border:1px solid var(--line);
  border-radius:16px;
  box-shadow:var(--shadow-card);
}

/* ---------- buttons ---------- */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:44px;padding:0 22px;border-radius:12px;font-size:15px;font-weight:600;letter-spacing:0;transition:transform .18s ease,box-shadow .18s ease,border-color .18s ease,color .18s ease;white-space:nowrap}
.btn-primary{background:linear-gradient(135deg,#3D7BFF 0%,#1B4BD8 100%);color:#fff;box-shadow:var(--glow)}
.btn-primary:hover{transform:translateY(-1px);box-shadow:var(--glow-strong)}
.btn-primary:active{transform:translateY(0)}
.btn-secondary{background:rgba(255,255,255,.04);border:1px solid var(--line);color:var(--text-1)}
.btn-secondary:hover{border-color:rgba(61,123,255,.55);color:#fff}
.btn-ghost{background:transparent;color:var(--text-2);padding:0 6px;min-height:36px}
.btn-ghost:hover{color:var(--accent)}
.btn[disabled],.btn.is-disabled{opacity:.4;pointer-events:none}

/* ---------- nav ---------- */
.site-header{
  position:sticky;top:0;z-index:60;
  background:rgba(7,12,24,.70);
  backdrop-filter:blur(20px);
  -webkit-backdrop-filter:blur(20px);
  border-bottom:1px solid var(--line);
  transition:background .25s ease,box-shadow .25s ease;
}
.site-header.is-scrolled{background:rgba(5,8,17,.92);box-shadow:0 8px 30px rgba(0,0,0,.45)}
.nav-inner{display:flex;align-items:center;justify-content:space-between;height:62px;gap:16px}
.logo{display:flex;align-items:center;gap:10px;flex-shrink:0}
.logo-text{font-size:17px;font-weight:700;letter-spacing:0;color:#fff}
.nav-links{display:none;align-items:center;gap:4px}
@media(min-width:1024px){.nav-links{display:flex}}
.nav-link{position:relative;display:inline-flex;align-items:center;height:62px;padding:0 14px;font-size:15px;color:var(--text-2);transition:color .18s ease}
.nav-link:hover{color:#fff}
.nav-link.is-active{color:#fff;font-weight:600}
.nav-link.is-active::after{content:"";position:absolute;left:14px;right:14px;bottom:14px;height:2px;border-radius:2px;background:linear-gradient(90deg,#3D7BFF,#1FE0B0);box-shadow:0 0 12px rgba(31,224,176,.6)}
.nav-right{display:flex;align-items:center;gap:14px}
.nav-right .login{font-size:15px;color:var(--text-2);transition:color .18s ease}
.nav-right .login:hover{color:var(--accent)}
.nav-right .btn{min-height:40px;padding:0 16px;font-size:14px}
.hamburger{display:inline-flex;align-items:center;justify-content:center;width:44px;height:44px;border-radius:12px;border:1px solid var(--line);background:rgba(255,255,255,.04)}
@media(min-width:1024px){.hamburger{display:none}}
.drawer{position:fixed;inset:62px 0 0 0;z-index:55;background:rgba(5,7,15,.97);backdrop-filter:blur(18px);padding:20px 16px 120px;overflow-y:auto;transform:translateY(-8px);opacity:0;visibility:hidden;transition:opacity .22s ease,transform .22s ease,visibility .22s}
.drawer.is-open{opacity:1;visibility:visible;transform:translateY(0)}
.drawer a{display:flex;align-items:center;justify-content:space-between;min-height:52px;padding:0 16px;border-radius:12px;border:1px solid var(--line);background:rgba(255,255,255,.03);margin-bottom:10px;font-size:16px;color:var(--text-1)}
.drawer a span.tag{font-size:12px;color:var(--text-3)}
.drawer-cta{position:fixed;left:16px;right:16px;bottom:16px;z-index:56}

/* ---------- hero ---------- */
.hero{position:relative;overflow:hidden;border-bottom:1px solid var(--line);background:var(--bg-0)}
.hero-bg{position:absolute;inset:0}
.hero-bg img{width:100%;height:100%;object-fit:cover;opacity:.55}
.hero-mask{position:absolute;inset:0;background:linear-gradient(90deg,rgba(5,7,15,.96) 0%,rgba(5,7,15,.86) 42%,rgba(5,7,15,.55) 100%),linear-gradient(180deg,rgba(5,7,15,.35) 0%,rgba(5,7,15,.92) 100%)}
.grid-lines{position:absolute;inset:0;background-image:linear-gradient(rgba(120,160,255,.07) 1px,transparent 1px),linear-gradient(90deg,rgba(120,160,255,.07) 1px,transparent 1px);background-size:64px 64px;mask-image:linear-gradient(90deg,transparent 0%,#000 45%,#000 100%);-webkit-mask-image:linear-gradient(90deg,transparent 0%,#000 45%,#000 100%)}
.slash{position:absolute;top:-10%;right:-6%;width:38%;height:120%;background:linear-gradient(180deg,rgba(61,123,255,.16),rgba(31,224,176,.05));transform:skewX(-14deg);border-left:1px solid rgba(120,160,255,.18);pointer-events:none}
.hero-inner{position:relative;z-index:2;padding-top:64px;padding-bottom:56px}
@media(min-width:1024px){.hero-inner{padding-top:96px;padding-bottom:80px}}
.hero h1{font-size:clamp(28px,5vw,48px);line-height:1.24;font-weight:700;color:#fff}
.hero .sub{margin-top:16px;font-size:17px;color:var(--text-2);max-width:560px}
.hero .cta-row{margin-top:30px;display:flex;flex-wrap:wrap;gap:12px}
.stat-bar{margin-top:44px;display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:1px;background:var(--line);border:1px solid var(--line);border-radius:14px;overflow:hidden}
@media(min-width:768px){.stat-bar{grid-template-columns:repeat(4,minmax(0,1fr))}}
.stat-item{background:rgba(10,16,32,.78);padding:16px 18px}
.stat-item .v{font-size:24px;font-weight:700;color:#fff;line-height:1.3}
.stat-item .k{font-size:13px;color:var(--text-3);margin-top:2px}

/* ---------- section title ---------- */
.sec-head{max-width:720px}
.sec-head h2{font-size:28px;font-weight:600;color:#fff;line-height:1.35}
@media(min-width:1024px){.sec-head h2{font-size:32px}}
.sec-head p{margin-top:12px;color:var(--text-2);font-size:15.5px}
.eyebrow{display:inline-flex;align-items:center;gap:8px;font-size:13px;color:var(--accent);letter-spacing:0;margin-bottom:12px}
.eyebrow::before{content:"";width:18px;height:2px;border-radius:2px;background:var(--accent)}

/* ---------- compare table ---------- */
.table-wrap{border-radius:14px;overflow:hidden;border:1px solid var(--line)}
.cmp-table{width:100%;border-collapse:collapse}
.cmp-table thead th{position:sticky;top:0;background:rgba(12,19,38,.96);font-size:14px;font-weight:600;color:var(--text-2);padding:14px 18px;text-align:left;border-bottom:1px solid var(--line);backdrop-filter:blur(8px)}
.cmp-table thead th.col-member{color:#fff;background:linear-gradient(180deg,rgba(61,123,255,.22),rgba(12,19,38,.96))}
.cmp-table tbody td{padding:15px 18px;font-size:15px;border-bottom:1px solid rgba(120,160,255,.08);vertical-align:middle}
.cmp-table tbody tr:nth-child(odd){background:rgba(255,255,255,.018)}
.cmp-table tbody tr:hover{background:rgba(255,255,255,.035)}
.cmp-table tbody tr:last-child td{border-bottom:0}
.cmp-table td:first-child{color:var(--text-1);text-align:left}
.cmp-table td.col-free{color:var(--text-3)}
.cmp-table td.col-member{color:var(--text-1);background:rgba(61,123,255,.06)}
.ico{width:20px;height:20px;flex:0 0 20px}
.cmp-cell{display:flex;align-items:center;gap:8px;font-size:14.5px}
.mobile-cmp{display:none}

/* ---------- level stairs ---------- */
.level-list{position:relative;margin-top:36px;padding-left:0}
.level-list::before{content:"";position:absolute;left:23px;top:16px;bottom:16px;width:1px;background:linear-gradient(180deg,rgba(61,123,255,.5),rgba(31,224,176,.28),transparent)}
.level-item{position:relative;display:flex;gap:18px;padding:0 0 26px 0}
.level-num{position:relative;z-index:1;flex:0 0 48px;height:48px;border-radius:14px;display:flex;align-items:center;justify-content:center;background:var(--bg-1);border:1px solid var(--line);font-size:20px;font-weight:700;color:var(--brand-300);font-variant-numeric:tabular-nums}
.level-card{flex:1 1 auto;padding:20px 22px}
.level-card.is-recommend{border-color:rgba(61,123,255,.45);box-shadow:var(--glow)}
.level-head{display:flex;align-items:center;gap:12px;flex-wrap:wrap}
.level-head h3{font-size:20px;font-weight:600;color:#fff}
.badge-pill{display:inline-flex;align-items:center;gap:6px;height:24px;padding:0 11px;border-radius:999px;font-size:12.5px;line-height:1}
.badge-accent{background:rgba(31,224,176,.14);color:var(--accent);border:1px solid rgba(31,224,176,.32)}
.badge-brand{background:rgba(61,123,255,.14);color:var(--brand-300);border:1px solid rgba(61,123,255,.32)}
.badge-glow{background:linear-gradient(135deg,rgba(61,123,255,.28),rgba(31,224,176,.2));color:#fff;border:1px solid rgba(61,123,255,.5)}
.level-body{display:flex;gap:20px;align-items:flex-start;margin-top:14px;flex-wrap:wrap}
.level-thumb{flex:0 0 88px;width:88px;height:88px;border-radius:14px;object-fit:cover;border:1px solid var(--line)}
.level-points{flex:1 1 240px;display:grid;gap:8px}
.level-points li{display:flex;gap:9px;align-items:flex-start;font-size:14.5px;color:var(--text-2)}
.dot{flex:0 0 6px;width:6px;height:6px;border-radius:50%;background:var(--accent);margin-top:9px;box-shadow:0 0 8px rgba(31,224,176,.7)}

/* ---------- locked preview ---------- */
.preview-grid{display:grid;gap:22px}
@media(min-width:1024px){.preview-grid{grid-template-columns:2fr 1fr}}
.preview-card{overflow:hidden;position:relative;transition:transform .2s ease,border-color .2s ease}
.preview-card:hover{transform:translateY(-2px);border-color:rgba(61,123,255,.45)}
.preview-media{position:relative;overflow:hidden}
.preview-media img{width:100%;height:100%;object-fit:cover;transition:transform .2s ease}
.preview-card:hover .preview-media img{transform:scale(1.03)}
.aspect-16-9{aspect-ratio:16/9}
.aspect-4-3{aspect-ratio:4/3}
.lock-layer{position:absolute;inset:0;background:rgba(5,7,15,.66);backdrop-filter:blur(2px);-webkit-backdrop-filter:blur(2px);display:flex;flex-direction:column;align-items:center;justify-content:center;gap:10px}
.lock-layer .lock-text{font-size:13px;color:var(--text-2)}
.preview-body{padding:20px 22px}
.preview-body h3{font-size:18px;font-weight:600;color:#fff;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.preview-body p{margin-top:8px;font-size:14.5px;color:var(--text-3);display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.side-stack{display:grid;gap:22px}
.side-card{display:grid;grid-template-columns:120px 1fr;overflow:hidden}
.side-card .preview-media{height:100%}
.side-card .preview-body{padding:16px}
@media(max-width:520px){.side-card{grid-template-columns:1fr}.side-card .preview-media{aspect-ratio:16/9;height:auto}}

/* ---------- FAQ ---------- */
.faq-list{display:grid;gap:12px;margin-top:32px}
.faq-item{overflow:hidden}
.faq-q{width:100%;display:flex;align-items:center;justify-content:space-between;gap:16px;padding:18px 22px;text-align:left;font-size:16px;font-weight:600;color:var(--text-1)}
.faq-q:hover{color:#fff}
.faq-icon{position:relative;flex:0 0 20px;height:20px}
.faq-icon::before,.faq-icon::after{content:"";position:absolute;background:var(--brand-300);border-radius:2px;transition:transform .3s ease,opacity .3s ease}
.faq-icon::before{left:2px;right:2px;top:9px;height:2px}
.faq-icon::after{top:2px;bottom:2px;left:9px;width:2px}
.faq-item.is-open .faq-icon::after{transform:rotate(90deg);opacity:0}
.faq-item.is-open .faq-icon::before{background:var(--accent)}
.faq-a{max-height:0;overflow:hidden;transition:max-height .3s ease}
.faq-a-inner{padding:0 22px 20px;font-size:15px;color:var(--text-2);border-top:1px solid var(--line);padding-top:16px}

/* ---------- CTA band ---------- */
.cta-band{position:relative;overflow:hidden;border-radius:16px}
.cta-band .cta-bg{position:absolute;inset:0}
.cta-band .cta-bg img{width:100%;height:100%;object-fit:cover;opacity:.4}
.cta-band .cta-mask{position:absolute;inset:0;background:linear-gradient(120deg,rgba(5,7,15,.95),rgba(5,7,15,.72) 55%,rgba(27,75,216,.42))}
.cta-inner{position:relative;z-index:2;padding:36px 24px;display:flex;flex-wrap:wrap;gap:24px;align-items:center;justify-content:space-between}
@media(min-width:768px){.cta-inner{padding:44px 40px}}
.cta-inner h2{font-size:26px;font-weight:600;color:#fff}
.tag-row{display:flex;flex-wrap:wrap;gap:10px;margin-top:18px}
.tag-chip{display:inline-flex;align-items:center;gap:7px;height:30px;padding:0 13px;border-radius:999px;font-size:13px;color:var(--text-2);background:rgba(255,255,255,.05);border:1px solid var(--line)}
.tag-chip svg{width:14px;height:14px}
.form-box{margin-top:22px;display:flex;flex-wrap:wrap;gap:12px;max-width:520px}
.input{flex:1 1 220px;min-height:44px;padding:0 16px;border-radius:12px;background:rgba(255,255,255,.04);border:1px solid var(--line);color:var(--text-1);font-size:15px;font-family:inherit;appearance:none;transition:border-color .18s ease,box-shadow .18s ease}
.input::placeholder{color:var(--text-3)}
.input:focus{outline:none;border-color:var(--accent);box-shadow:0 0 0 3px rgba(31,224,176,.16)}
.form-hint{font-size:13px;color:var(--text-3);margin-top:10px}

/* ---------- posts ---------- */
.filter-row{display:flex;gap:10px;flex-wrap:wrap;margin-top:24px}
.filter-chip{display:inline-flex;align-items:center;height:34px;padding:0 15px;border-radius:999px;font-size:13.5px;color:var(--text-2);background:rgba(255,255,255,.04);border:1px solid var(--line);transition:all .18s ease}
.filter-chip:hover{color:#fff;border-color:rgba(61,123,255,.5)}
.filter-chip.is-on{background:rgba(61,123,255,.16);color:#fff;border-color:rgba(61,123,255,.5)}
.post-grid{display:grid;gap:22px;margin-top:28px;grid-template-columns:1fr}
@media(min-width:768px){.post-grid{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media(min-width:1024px){.post-grid{grid-template-columns:repeat(3,minmax(0,1fr))}}
.post-card{display:flex;flex-direction:column;padding:22px;transition:transform .2s ease,border-color .2s ease}
.post-card:hover{transform:translateY(-2px);border-color:rgba(61,123,255,.5)}
.post-card h3{font-size:17.5px;font-weight:600;color:#fff;line-height:1.5;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.post-card p{margin-top:10px;font-size:14.5px;color:var(--text-3);display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.post-meta{margin-top:18px;padding-top:14px;border-top:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;gap:12px;font-size:13px;color:var(--text-3)}
.empty-state{margin-top:28px;padding:56px 24px;text-align:center;border-radius:16px;background:var(--panel);border:1px solid var(--line);backdrop-filter:blur(14px)}
.empty-state p{color:var(--text-2);font-size:15px}
.empty-state .btn{margin-top:18px}

/* ---------- footer ---------- */
.site-footer{border-top:1px solid var(--line);background:linear-gradient(180deg,rgba(10,16,32,.9),rgba(5,7,15,1));margin-top:8px}
.foot-grid{display:grid;gap:28px;padding-top:56px;padding-bottom:32px;grid-template-columns:1fr}
@media(min-width:768px){.foot-grid{grid-template-columns:1.4fr 1fr 1fr}}
@media(min-width:1024px){.foot-grid{grid-template-columns:1.6fr 1fr 1fr 1.2fr}}
.foot-title{font-size:14px;font-weight:600;color:#fff;margin-bottom:16px}
.foot-link{display:block;font-size:14px;color:var(--text-3);padding:6px 0;transition:color .18s ease}
.foot-link:hover{color:var(--accent)}
.foot-bottom{border-top:1px solid var(--line);padding-top:20px;padding-bottom:28px;display:flex;flex-wrap:wrap;gap:12px;align-items:center;justify-content:space-between;font-size:13px;color:var(--text-3)}
.foot-sub{display:flex;gap:10px;flex-wrap:wrap;margin-top:16px}

/* ---------- animation ---------- */
.fade-up{animation:fadeUp .5s ease both}
@keyframes fadeUp{from{opacity:0;transform:translateY(14px)}to{opacity:1;transform:translateY(0)}}
.pulse-soft{animation:pulseSoft 3.6s ease-in-out infinite}
@keyframes pulseSoft{0%,100%{box-shadow:0 0 0 1px rgba(61,123,255,.35),0 8px 30px rgba(31,90,255,.28)}50%{box-shadow:0 0 0 1px rgba(61,123,255,.55),0 10px 38px rgba(31,90,255,.45)}}
@media(max-width:767px){
  .table-wrap{display:none}
  .mobile-cmp{display:grid;gap:14px;margin-top:24px}
  .mobile-cmp .m-item{padding:16px 18px;border-radius:14px;border:1px solid var(--line);background:var(--panel)}
  .mobile-cmp .m-item h4{font-size:15px;font-weight:600;color:#fff;margin-bottom:10px}
  .mobile-cmp .m-row{display:flex;align-items:center;justify-content:space-between;gap:10px;font-size:14px;padding:6px 0}
  .mobile-cmp .m-row span:first-child{color:var(--text-3)}
}
@media(prefers-reduced-motion:reduce){
  *{animation:none !important;transition:none !important}
  html{scroll-behavior:auto}
}

/* roulang page: article */
:root{
  --bg-0:#05070F;
  --bg-1:#0A1020;
  --brand-500:#3D7BFF;
  --brand-700:#1B4BD8;
  --brand-300:#7EA8FF;
  --accent:#1FE0B0;
  --warn:#FF9A2E;
  --text:#E8EEFA;
  --text-2:#A7B4CC;
  --text-3:#6B7A99;
  --line:rgba(120,160,255,.14);
  --glass:rgba(18,26,44,.62);
  --glass-strong:rgba(13,20,36,.82);
  --radius:16px;
  --radius-sm:12px;
  --shadow:0 10px 30px rgba(0,0,0,.35);
  --glow:0 0 0 1px rgba(61,123,255,.35), 0 8px 30px rgba(31,90,255,.28);
  --container:1200px;
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{
  margin:0;
  background:
    radial-gradient(900px 520px at 82% -6%, rgba(61,123,255,.16), transparent 62%),
    radial-gradient(700px 420px at 6% 8%, rgba(31,224,176,.08), transparent 60%),
    linear-gradient(180deg,var(--bg-0) 0%, var(--bg-1) 52%, var(--bg-0) 100%);
  color:var(--text);
  font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei","Noto Sans SC",sans-serif;
  font-size:16px;
  line-height:1.75;
  letter-spacing:0;
  min-height:100vh;
  overflow-x:hidden;
}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;background:none;border:none;cursor:pointer}
input{font:inherit}
h1,h2,h3,h4,p,ul,ol,figure,blockquote{margin:0}
ul,ol{padding:0;list-style:none}
::selection{background:rgba(61,123,255,.35);color:#fff}
.num{font-variant-numeric:tabular-nums}
.container-x{width:100%;max-width:var(--container);margin:0 auto;padding-left:16px;padding-right:16px}

/* ---------- 顶部导航 ---------- */
.site-header{
  position:sticky;top:0;z-index:60;
  background:rgba(7,12,24,.70);
  backdrop-filter:blur(18px);
  -webkit-backdrop-filter:blur(18px);
  border-bottom:1px solid var(--line);
  transition:background .25s ease, box-shadow .25s ease;
}
.site-header.is-scrolled{background:rgba(5,8,18,.92);box-shadow:0 10px 30px rgba(0,0,0,.45)}
.header-inner{display:flex;align-items:center;gap:24px;height:64px}
.logo{display:inline-flex;align-items:center;gap:10px;flex:0 0 auto}
.logo-text{font-size:17px;font-weight:700;letter-spacing:0;color:var(--text);white-space:nowrap}
.nav-links{display:flex;align-items:center;gap:6px;margin-left:8px}
.nav-link{
  position:relative;display:inline-flex;align-items:center;height:64px;
  padding:0 12px;font-size:15px;color:var(--text-2);white-space:nowrap;
  transition:color .2s ease;
}
.nav-link:hover{color:var(--text)}
.nav-link::after{
  content:"";position:absolute;left:12px;right:12px;bottom:12px;height:2px;border-radius:2px;
  background:linear-gradient(90deg,var(--brand-500),var(--accent));
  opacity:0;transform:scaleX(.4);transition:opacity .22s ease, transform .22s ease;
}
.nav-link:hover::after{opacity:.5;transform:scaleX(1)}
.nav-link.is-active{color:var(--text);font-weight:600}
.nav-link.is-active::after{opacity:1;transform:scaleX(1)}
.header-actions{display:flex;align-items:center;gap:14px;margin-left:auto}
.link-plain{font-size:14px;color:var(--text-2);transition:color .2s ease}
.link-plain:hover{color:var(--accent)}
.menu-toggle{
  display:none;width:44px;height:44px;border-radius:12px;
  border:1px solid var(--line);align-items:center;justify-content:center;
  background:rgba(255,255,255,.03);
}
.menu-toggle svg{width:20px;height:20px}

/* ---------- 按钮体系 ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  min-height:44px;padding:0 20px;border-radius:var(--radius-sm);
  font-size:15px;font-weight:600;line-height:1;
  border:1px solid transparent;cursor:pointer;
  transition:transform .18s ease, box-shadow .18s ease, border-color .18s ease, background .18s ease, color .18s ease;
}
.btn:focus-visible{outline:2px solid var(--accent);outline-offset:2px}
.btn-primary{
  background:linear-gradient(135deg,var(--brand-500),var(--brand-700));
  color:#fff;box-shadow:var(--glow);
}
.btn-primary:hover{transform:translateY(-1px);box-shadow:0 0 0 1px rgba(61,123,255,.5),0 14px 38px rgba(31,90,255,.42)}
.btn-primary:active{transform:translateY(1px)}
.btn-secondary{
  background:rgba(255,255,255,.04);border-color:var(--line);color:var(--text);
}
.btn-secondary:hover{border-color:rgba(61,123,255,.6);color:#fff;box-shadow:0 8px 24px rgba(31,90,255,.18)}
.btn-ghost{color:var(--text-2);padding:0 12px}
.btn-ghost:hover{color:var(--accent)}
.btn-sm{min-height:38px;padding:0 16px;font-size:14px}
.btn[disabled],.btn.is-disabled{opacity:.4;pointer-events:none}

/* ---------- 移动端抽屉 ---------- */
.drawer-mask{
  position:fixed;inset:0;background:rgba(3,6,14,.72);backdrop-filter:blur(4px);
  opacity:0;visibility:hidden;transition:opacity .25s ease, visibility .25s ease;z-index:80;
}
.drawer-mask.is-open{opacity:1;visibility:visible}
.mobile-drawer{
  position:fixed;top:0;right:0;bottom:0;width:min(84vw,340px);z-index:90;
  background:var(--glass-strong);backdrop-filter:blur(20px);
  border-left:1px solid var(--line);
  transform:translateX(100%);transition:transform .3s ease;
  display:flex;flex-direction:column;padding:20px;gap:8px;
}
.mobile-drawer.is-open{transform:translateX(0)}
.drawer-head{display:flex;align-items:center;justify-content:space-between;margin-bottom:12px}
.drawer-close{width:40px;height:40px;border-radius:10px;border:1px solid var(--line);display:flex;align-items:center;justify-content:center}
.drawer-group-title{font-size:12px;color:var(--text-3);margin:14px 0 6px}
.drawer-link{
  display:flex;align-items:center;justify-content:space-between;
  padding:14px 14px;border-radius:12px;font-size:15px;color:var(--text-2);
  border:1px solid transparent;transition:.2s ease;
}
.drawer-link:hover,.drawer-link.is-active{background:rgba(61,123,255,.10);border-color:var(--line);color:var(--text)}
.drawer-foot{margin-top:auto;display:flex;flex-direction:column;gap:10px;padding-top:18px;border-top:1px solid var(--line)}

/* ---------- 阅读进度 ---------- */
.read-progress{position:fixed;left:0;top:0;height:2px;width:0;z-index:70;background:linear-gradient(90deg,var(--brand-500),var(--accent));transition:width .12s linear}

/* ---------- 面包屑 ---------- */
.crumb-wrap{border-bottom:1px solid var(--line);background:rgba(8,13,26,.5)}
.crumb{display:flex;align-items:center;gap:10px;flex-wrap:wrap;padding:14px 0;font-size:13px;color:var(--text-3)}
.crumb a{color:var(--text-2);transition:color .2s ease}
.crumb a:hover{color:var(--accent)}
.crumb .sep{color:rgba(107,122,153,.7)}
.crumb .current{color:var(--text-3);max-width:min(64vw,560px);overflow:hidden;text-overflow:ellipsis;white-space:nowrap}

/* ---------- 文章头 ---------- */
.article-head{padding:44px 0 28px;border-bottom:1px solid var(--line)}
.badge{
  display:inline-flex;align-items:center;gap:6px;height:26px;padding:0 12px;border-radius:999px;
  font-size:12px;font-weight:600;letter-spacing:0;
}
.badge-accent{background:rgba(31,224,176,.12);color:var(--accent);border:1px solid rgba(31,224,176,.28)}
.badge-brand{background:rgba(61,123,255,.12);color:var(--brand-300);border:1px solid rgba(61,123,255,.26)}
.badge-glass{background:rgba(255,255,255,.04);color:var(--text-2);border:1px solid var(--line)}
.article-title{
  margin:16px 0 16px;font-size:clamp(26px,4.2vw,40px);line-height:1.28;font-weight:700;color:#fff;
  max-width:900px;
}
.meta-row{display:flex;align-items:center;gap:16px;flex-wrap:wrap;font-size:13px;color:var(--text-3)}
.meta-row .dot{width:4px;height:4px;border-radius:50%;background:rgba(107,122,153,.6)}
.article-lead{max-width:820px;margin-top:16px;font-size:16px;color:var(--text-2)}

/* ---------- 布局 ---------- */
.layout{
  display:grid;grid-template-columns:minmax(0,1fr) 320px;
  gap:44px;align-items:start;padding:44px 0 8px;
}
.article-main{min-width:0;max-width:760px;width:100%;margin:0 auto}
@media (min-width:1025px){ .article-main{margin:0} }

/* ---------- 正文排版 ---------- */
.article-body{font-size:16px;line-height:1.85;color:var(--text-2);overflow-wrap:break-word}
.article-body>*+*{margin-top:1em}
.article-body p{font-size:16px;line-height:1.85;color:var(--text-2)}
.article-body h2{
  margin:32px 0 16px;font-size:24px;line-height:1.4;font-weight:600;color:#fff;
  padding-left:14px;border-left:3px solid var(--brand-500);
}
.article-body h3{margin:26px 0 12px;font-size:20px;line-height:1.45;font-weight:600;color:#EAF1FF}
.article-body h4{margin:22px 0 10px;font-size:17px;font-weight:600;color:#EAF1FF}
.article-body a{color:var(--brand-300);text-decoration:underline;text-underline-offset:3px;transition:color .2s ease}
.article-body a:hover{color:var(--accent)}
.article-body strong{color:#fff;font-weight:600}
.article-body ul,.article-body ol{margin:16px 0;padding-left:4px}
.article-body li{position:relative;padding-left:20px;margin:8px 0;color:var(--text-2)}
.article-body ul>li::before{
  content:"";position:absolute;left:2px;top:11px;width:7px;height:7px;border-radius:50%;
  background:var(--accent);box-shadow:0 0 10px rgba(31,224,176,.5);
}
.article-body ol{counter-reset:cmsli}
.article-body ol>li{counter-increment:cmsli}
.article-body ol>li::before{
  content:counter(cmsli);position:absolute;left:0;top:4px;
  font-size:13px;font-weight:700;color:var(--brand-300);font-variant-numeric:tabular-nums;
}
.article-body blockquote{
  margin:24px 0;padding:18px 20px;border-left:3px solid var(--brand-500);
  background:var(--glass);border-radius:0 12px 12px 0;color:var(--text);
  backdrop-filter:blur(10px);
}
.article-body blockquote p{color:var(--text)}
.article-body img{border-radius:12px;margin:24px auto;height:auto}
.article-body figure{margin:24px 0}
.article-body figcaption{margin-top:10px;font-size:13px;color:var(--text-3);text-align:center}
.article-body table{
  width:100%;border-collapse:collapse;margin:24px 0;font-size:15px;
  background:var(--glass);border-radius:12px;overflow:hidden;
}
.article-body th,.article-body td{padding:12px 14px;border-bottom:1px solid var(--line);text-align:left}
.article-body thead th{background:rgba(61,123,255,.12);color:#fff;font-weight:600}
.article-body tbody tr:hover{background:rgba(255,255,255,.03)}
.article-body hr{border:none;border-top:1px solid var(--line);margin:32px 0}
.article-body code{
  padding:2px 6px;border-radius:6px;background:rgba(255,255,255,.06);
  font-size:14px;color:var(--accent);
}
.body-wrap{
  background:var(--glass);border:1px solid var(--line);border-radius:var(--radius);
  padding:28px;backdrop-filter:blur(14px);box-shadow:var(--shadow);
}

/* ---------- 空态 ---------- */
.empty-state{
  display:flex;flex-direction:column;align-items:center;gap:14px;text-align:center;
  padding:56px 24px;background:var(--glass);border:1px solid var(--line);
  border-radius:var(--radius);backdrop-filter:blur(14px);
}
.empty-state svg{width:44px;height:44px;color:var(--brand-300)}
.empty-title{font-size:19px;font-weight:600;color:#fff}
.empty-text{font-size:14px;color:var(--text-3);max-width:420px}

/* ---------- 侧栏 ---------- */
.side-stack{display:flex;flex-direction:column;gap:20px;position:sticky;top:88px}
.panel{
  background:var(--glass);border:1px solid var(--line);border-radius:var(--radius);
  padding:22px;backdrop-filter:blur(14px);box-shadow:var(--shadow);
}
.panel-title{font-size:15px;font-weight:600;color:#fff;margin-bottom:14px;display:flex;align-items:center;gap:8px}
.panel-title::before{content:"";width:3px;height:14px;border-radius:2px;background:linear-gradient(180deg,var(--brand-500),var(--accent))}
.toc-list{display:flex;flex-direction:column;gap:2px}
.toc-item{
  display:block;padding:9px 12px;border-radius:10px;font-size:14px;color:var(--text-2);
  border-left:2px solid transparent;transition:.2s ease;
}
.toc-item:hover{background:rgba(61,123,255,.10);color:#fff;border-left-color:var(--brand-500)}
.member-card{
  background:
    radial-gradient(320px 180px at 100% 0, rgba(61,123,255,.20), transparent 70%),
    var(--glass);
  border:1px solid rgba(61,123,255,.32);
}
.member-card .mc-head{display:flex;align-items:center;gap:12px;margin-bottom:14px}
.member-card .mc-avatar{
  width:44px;height:44px;border-radius:14px;flex:0 0 auto;
  background:linear-gradient(135deg,var(--brand-500),var(--brand-700));
  display:flex;align-items:center;justify-content:center;
  box-shadow:0 8px 22px rgba(31,90,255,.32);
}
.member-card .mc-name{font-size:15px;font-weight:600;color:#fff}
.member-card .mc-role{font-size:12px;color:var(--text-3)}
.mc-points{display:flex;flex-direction:column;gap:8px;margin:4px 0 18px}
.mc-point{display:flex;gap:8px;align-items:flex-start;font-size:14px;color:var(--text-2)}
.mc-point svg{width:16px;height:16px;flex:0 0 auto;margin-top:4px;color:var(--accent)}
.mc-num{font-variant-numeric:tabular-nums;color:var(--accent);font-weight:600}

/* ---------- 相关推荐 ---------- */
.section{padding:56px 0}
.section-head{margin-bottom:24px}
.section-head h2{font-size:clamp(22px,3vw,30px);font-weight:600;color:#fff;line-height:1.35}
.section-head p{margin-top:8px;font-size:15px;color:var(--text-3)}
.rel-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:20px}
.rel-card{
  display:flex;gap:16px;padding:16px;border-radius:var(--radius);
  background:var(--glass);border:1px solid var(--line);
  transition:transform .2s ease, border-color .2s ease, box-shadow .2s ease;
}
.rel-card:hover{transform:translateY(-2px);border-color:rgba(61,123,255,.55);box-shadow:0 12px 32px rgba(0,0,0,.4)}
.rel-thumb{
  width:96px;height:72px;flex:0 0 auto;border-radius:12px;overflow:hidden;
  background:rgba(255,255,255,.04);
}
.rel-thumb img{width:100%;height:100%;object-fit:cover;transition:transform .2s ease}
.rel-card:hover .rel-thumb img{transform:scale(1.03)}
.rel-body{min-width:0}
.rel-title{font-size:15px;font-weight:600;color:#fff;line-height:1.5;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}
.rel-desc{margin-top:6px;font-size:13px;color:var(--text-3);display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}

/* ---------- FAQ ---------- */
.faq-list{display:flex;flex-direction:column;gap:12px}
.faq-item{
  background:var(--glass);border:1px solid var(--line);border-radius:var(--radius);
  backdrop-filter:blur(14px);overflow:hidden;transition:border-color .2s ease;
}
.faq-item.is-open{border-color:rgba(61,123,255,.5)}
.faq-q{
  width:100%;display:flex;align-items:center;justify-content:space-between;gap:16px;
  padding:18px 22px;font-size:16px;font-weight:600;color:#fff;text-align:left;min-height:56px;
}
.faq-icon{
  width:26px;height:26px;flex:0 0 auto;border-radius:8px;border:1px solid var(--line);
  display:flex;align-items:center;justify-content:center;font-size:16px;color:var(--accent);
  transition:transform .3s ease, background .3s ease;
}
.faq-item.is-open .faq-icon{transform:rotate(180deg);background:rgba(31,224,176,.12)}
.faq-a{max-height:0;overflow:hidden;transition:max-height .3s ease}
.faq-a-inner{padding:0 22px 20px;font-size:15px;color:var(--text-2);line-height:1.8}

/* ---------- CTA ---------- */
.cta-band{
  position:relative;overflow:hidden;border-radius:20px;border:1px solid rgba(61,123,255,.3);
  background:
    linear-gradient(180deg, rgba(10,16,32,.72), rgba(5,7,15,.86)),
    url('/assets/images/backpic/back-2.webp') center/cover no-repeat;
  padding:40px;backdrop-filter:blur(8px);
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:26px;
}
.cta-band::after{
  content:"";position:absolute;left:-60px;top:-40px;width:280px;height:280px;
  background:radial-gradient(circle, rgba(61,123,255,.34), transparent 68%);pointer-events:none;
}
.cta-copy{position:relative;z-index:2;max-width:640px}
.cta-copy h2{font-size:clamp(22px,2.8vw,28px);font-weight:600;color:#fff;line-height:1.4}
.cta-copy p{margin-top:10px;font-size:15px;color:var(--text-2)}
.cta-tags{display:flex;flex-wrap:wrap;gap:10px;margin-top:16px}
.cta-actions{position:relative;z-index:2;display:flex;flex-wrap:wrap;gap:12px;align-items:center}
.tag{
  display:inline-flex;align-items:center;height:28px;padding:0 12px;border-radius:999px;
  font-size:12.5px;color:var(--text-2);background:rgba(255,255,255,.05);border:1px solid var(--line);
}
.breathe{animation:breathe 3.4s ease-in-out infinite}
@keyframes breathe{
  0%,100%{box-shadow:0 0 0 1px rgba(61,123,255,.35),0 8px 30px rgba(31,90,255,.24)}
  50%{box-shadow:0 0 0 1px rgba(61,123,255,.55),0 10px 38px rgba(31,90,255,.38)}
}
@media (prefers-reduced-motion: reduce){
  .breathe{animation:none}
  *{transition-duration:.01ms !important;animation-duration:.01ms !important}
}

/* ---------- 页脚 ---------- */
.site-footer{
  margin-top:64px;border-top:1px solid var(--line);
  background:linear-gradient(180deg, rgba(10,16,32,.7), rgba(5,7,15,.95));
  padding:56px 0 28px;
}
.foot-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1.3fr;gap:36px}
.foot-title{font-size:14px;font-weight:600;color:#fff;margin-bottom:14px}
.foot-link{display:block;font-size:14px;color:var(--text-3);padding:6px 0;transition:color .2s ease,transform .2s ease}
.foot-link:hover{color:var(--accent);transform:translateX(2px)}
.foot-sub{display:flex;gap:10px;margin-top:14px}
.input{
  width:100%;min-height:44px;padding:0 14px;border-radius:12px;
  background:rgba(255,255,255,.04);border:1px solid var(--line);color:var(--text);
  outline:none;transition:border-color .2s ease, box-shadow .2s ease;
}
.input::placeholder{color:rgba(107,122,153,.9)}
.input:focus{border-color:var(--accent);box-shadow:0 0 0 3px rgba(31,224,176,.18)}
.foot-bottom{
  margin-top:40px;padding-top:20px;border-top:1px solid var(--line);
  display:flex;flex-wrap:wrap;gap:10px;justify-content:space-between;
  font-size:13px;color:var(--text-3);
}

/* ---------- 淡入动效 ---------- */
.fade-up{opacity:0;transform:translateY(14px);transition:opacity .5s ease, transform .5s ease}
.fade-up.is-in{opacity:1;transform:none}

/* ---------- 响应式 ---------- */
@media (max-width:1024px){
  .layout{grid-template-columns:minmax(0,1fr);gap:34px;padding-top:32px}
  .side-stack{position:static;flex-direction:column}
  .article-main{max-width:none}
  .rel-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
  .foot-grid{grid-template-columns:1fr 1fr;gap:28px}
  .nav-links{display:none}
  .menu-toggle{display:inline-flex}
  .cta-band{padding:30px}
}
@media (max-width:768px){
  .header-inner{height:60px;gap:14px}
  .logo-text{font-size:16px}
  .header-actions .link-plain{display:none}
  .section{padding:44px 0}
  .article-head{padding:32px 0 22px}
  .body-wrap{padding:20px}
  .article-body h2{font-size:21px;margin-top:28px}
  .article-body h3{font-size:18px}
  .rel-grid{grid-template-columns:minmax(0,1fr)}
  .cta-actions{width:100%}
  .cta-actions .btn{flex:1 1 auto}
}
@media (max-width:520px){
  .container-x{padding-left:16px;padding-right:16px}
  .foot-grid{grid-template-columns:1fr}
  .rel-card{flex-direction:column}
  .rel-thumb{width:100%;height:150px}
  .btn{width:auto}
  .article-title{font-size:24px}
  .meta-row{gap:10px}
}

/* roulang page: category1 */
:root{
  --bg-0:#05070F;
  --bg-1:#0A1020;
  --panel:rgba(18,26,44,.62);
  --panel-solid:#0E1730;
  --brand-500:#3D7BFF;
  --brand-700:#1B4BD8;
  --brand-300:#7EA8FF;
  --accent:#1FE0B0;
  --warn:#FF9A2E;
  --text:#E8EEFA;
  --text-sub:#A7B4CC;
  --text-muted:#6B7A99;
  --line:rgba(120,160,255,.14);
  --line-strong:rgba(61,123,255,.45);
  --r-card:16px;
  --r-btn:12px;
  --r-table:14px;
  --shadow:0 10px 30px rgba(0,0,0,.35);
  --glow:0 0 0 1px rgba(61,123,255,.35),0 8px 30px rgba(31,90,255,.28);
  --glow-strong:0 0 0 1px rgba(61,123,255,.6),0 10px 40px rgba(31,90,255,.45);
  --sec-y:56px;
}
@media (min-width:768px){ :root{ --sec-y:72px; } }
@media (min-width:1024px){ :root{ --sec-y:96px; } }

*,*::before,*::after{ box-sizing:border-box; }
html{ -webkit-text-size-adjust:100%; scroll-behavior:smooth; }
body{
  margin:0;
  font-family:-apple-system,"PingFang SC","Microsoft YaHei","Noto Sans SC",sans-serif;
  background:var(--bg-0);
  color:var(--text);
  font-size:16px;
  line-height:1.75;
  letter-spacing:0;
  overflow-x:hidden;
}
img{ max-width:100%; display:block; border:0; }
a{ color:inherit; text-decoration:none; }
button,input{ font:inherit; color:inherit; }
button{ cursor:pointer; border:0; background:none; }
ul,ol{ margin:0; padding:0; list-style:none; }
h1,h2,h3,h4,p{ margin:0; }
:focus-visible{ outline:2px solid var(--accent); outline-offset:2px; border-radius:6px; }
.num{ font-variant-numeric:tabular-nums; }

.container-x{ width:100%; max-width:1200px; margin:0 auto; padding:0 16px; }
@media (min-width:768px){ .container-x{ padding:0 24px; } }
@media (min-width:1024px){ .container-x{ padding:0 32px; } }

/* ============ 导航 ============ */
.site-header{
  position:sticky; top:0; z-index:60;
  background:rgba(7,12,24,.70);
  backdrop-filter:blur(20px);
  -webkit-backdrop-filter:blur(20px);
  border-bottom:1px solid var(--line);
  transition:background .3s ease, box-shadow .3s ease;
}
.site-header.is-scrolled{
  background:rgba(4,6,13,.94);
  box-shadow:0 10px 30px rgba(0,0,0,.45);
}
.nav-bar{ display:flex; align-items:center; justify-content:space-between; gap:14px; height:62px; }
.logo{ display:inline-flex; align-items:center; gap:10px; flex:0 0 auto; }
.logo-text{ font-size:18px; font-weight:700; letter-spacing:0; white-space:nowrap; }
.nav-links{ display:none; align-items:center; gap:2px; }
@media (min-width:1024px){ .nav-links{ display:flex; } }
.nav-link{
  position:relative; display:inline-block; padding:9px 13px;
  font-size:15px; color:var(--text-sub); border-radius:10px;
  transition:color .2s ease, background .2s ease; white-space:nowrap;
}
.nav-link:hover{ color:var(--text); background:rgba(255,255,255,.05); }
.nav-link.is-active{ color:var(--text); }
.nav-link.is-active::after{
  content:""; position:absolute; left:13px; right:13px; bottom:3px; height:2px;
  border-radius:2px; background:linear-gradient(90deg,var(--brand-500),var(--accent));
  box-shadow:0 0 12px rgba(61,123,255,.75);
}
.nav-actions{ display:flex; align-items:center; gap:8px; }
.nav-login{ display:none; font-size:14px; color:var(--text-sub); padding:9px 8px; transition:color .2s ease; }
@media (min-width:640px){ .nav-login{ display:inline-block; } }
.nav-login:hover{ color:var(--accent); }
.nav-toggle{
  display:inline-flex; align-items:center; justify-content:center;
  width:44px; height:44px; border-radius:10px; border:1px solid var(--line);
  color:var(--text-sub); transition:.2s ease;
}
.nav-toggle:hover{ color:var(--text); border-color:var(--line-strong); }
@media (min-width:1024px){ .nav-toggle{ display:none; } }
.nav-toggle span{ display:block; width:18px; height:2px; background:currentColor; border-radius:2px; position:relative; }
.nav-toggle span::before,.nav-toggle span::after{
  content:""; position:absolute; left:0; width:18px; height:2px; background:currentColor; border-radius:2px;
}
.nav-toggle span::before{ top:-6px; }
.nav-toggle span::after{ top:6px; }

.drawer{
  position:fixed; left:0; right:0; top:62px; bottom:0; z-index:55;
  background:rgba(5,7,15,.98); backdrop-filter:blur(18px);
  padding:20px 16px 130px; overflow-y:auto;
  opacity:0; visibility:hidden; transform:translateY(-8px);
  transition:opacity .25s ease, transform .25s ease, visibility .25s ease;
}
.drawer.is-open{ opacity:1; visibility:visible; transform:translateY(0); }
@media (min-width:1024px){ .drawer{ display:none; } }
.drawer-title{ font-size:13px; color:var(--text-muted); margin:18px 0 8px; }
.drawer-link{
  display:flex; align-items:center; justify-content:space-between;
  min-height:48px; padding:0 14px; border-radius:12px;
  border:1px solid var(--line); background:rgba(255,255,255,.03);
  font-size:15px; color:var(--text-sub); margin-bottom:10px;
}
.drawer-link.is-active{ color:var(--text); border-color:var(--line-strong); box-shadow:var(--glow); }
.drawer-bottom{
  position:fixed; left:16px; right:16px; bottom:16px; z-index:56;
  display:flex; gap:10px;
}
.drawer-bottom .btn{ flex:1; }

/* ============ 按钮 ============ */
.btn{
  display:inline-flex; align-items:center; justify-content:center; gap:8px;
  min-height:44px; padding:0 20px; border-radius:var(--r-btn);
  font-size:15px; font-weight:600; line-height:1;
  transition:transform .18s ease, box-shadow .25s ease, background .25s ease, border-color .25s ease, color .25s ease;
  white-space:nowrap;
}
.btn-sm{ min-height:38px; padding:0 16px; font-size:14px; }
.btn-primary{
  color:#fff;
  background:linear-gradient(135deg,var(--brand-500) 0%,var(--brand-700) 100%);
  box-shadow:var(--glow);
}
.btn-primary:hover{ transform:translateY(-1px); box-shadow:var(--glow-strong); }
.btn-primary:active{ transform:translateY(1px); box-shadow:0 0 0 1px rgba(61,123,255,.35); }
.btn-second{
  color:var(--text);
  background:rgba(255,255,255,.05);
  border:1px solid var(--line);
}
.btn-second:hover{ border-color:var(--line-strong); background:rgba(61,123,255,.12); transform:translateY(-1px); }
.btn-second:active{ transform:translateY(1px); }
.btn-ghost{ color:var(--text-sub); padding:0 10px; }
.btn-ghost:hover{ color:var(--accent); }
.btn-glow{ animation:breath 3.6s ease-in-out infinite; }
@keyframes breath{
  0%,100%{ box-shadow:0 0 0 1px rgba(61,123,255,.35),0 8px 30px rgba(31,90,255,.24); }
  50%{ box-shadow:0 0 0 1px rgba(61,123,255,.5),0 10px 36px rgba(31,90,255,.42); }
}

/* ============ 玻璃与卡片 ============ */
.glass{
  background:var(--panel);
  backdrop-filter:blur(14px);
  -webkit-backdrop-filter:blur(14px);
  border:1px solid var(--line);
  border-radius:var(--r-card);
  box-shadow:var(--shadow);
}
.badge{
  display:inline-flex; align-items:center; gap:6px;
  padding:4px 11px; border-radius:999px;
  font-size:12px; font-weight:600; line-height:1.6;
  background:rgba(61,123,255,.12); color:var(--brand-300);
  border:1px solid rgba(61,123,255,.22);
}
.badge-accent{ background:rgba(31,224,176,.12); color:var(--accent); border-color:rgba(31,224,176,.3); }
.badge-warn{ background:rgba(255,154,46,.12); color:var(--warn); border-color:rgba(255,154,46,.32); }

/* ============ 区块 ============ */
.section{ padding:var(--sec-y) 0; }
.section-alt{ background:linear-gradient(180deg,rgba(10,16,32,.75) 0%,rgba(5,7,15,0) 100%); }
.sec-head{ margin-bottom:28px; }
.sec-title{ font-size:clamp(22px,3.4vw,30px); font-weight:600; line-height:1.35; }
.sec-desc{ margin-top:10px; font-size:15px; color:var(--text-sub); max-width:760px; }

/* ============ Hero（集约型） ============ */
.hero{ position:relative; overflow:hidden; border-bottom:1px solid var(--line); }
.hero-bg{ position:absolute; inset:0; z-index:0; }
.hero-bg img{ width:100%; height:100%; object-fit:cover; opacity:.55; }
.hero-mask{
  position:absolute; inset:0;
  background:
    linear-gradient(90deg,rgba(5,7,15,.97) 0%,rgba(5,7,15,.86) 48%,rgba(5,7,15,.62) 100%),
    linear-gradient(180deg,rgba(5,7,15,.5) 0%,rgba(5,7,15,.96) 100%);
}
.hero-grid{
  position:absolute; inset:0; opacity:.55;
  background-image:
    linear-gradient(rgba(120,160,255,.07) 1px,transparent 1px),
    linear-gradient(90deg,rgba(120,160,255,.07) 1px,transparent 1px);
  background-size:72px 72px;
  mask-image:radial-gradient(120% 100% at 20% 0%,#000 0%,transparent 72%);
  -webkit-mask-image:radial-gradient(120% 100% at 20% 0%,#000 0%,transparent 72%);
}
.hero-slash{
  position:absolute; top:-14%; right:16%; width:2px; height:132%;
  background:linear-gradient(180deg,transparent,rgba(61,123,255,.7) 45%,transparent);
  transform:rotate(15deg);
}
.hero-slash.s2{ right:24%; background:linear-gradient(180deg,transparent,rgba(31,224,176,.55) 55%,transparent); opacity:.7; }
.hero-glow{
  position:absolute; top:-30%; right:-12%; width:560px; height:560px; border-radius:50%;
  background:radial-gradient(circle,rgba(61,123,255,.30) 0%,rgba(61,123,255,0) 66%);
  filter:blur(14px); pointer-events:none;
}
.hero-inner{
  position:relative; z-index:1;
  display:grid; grid-template-columns:1fr; gap:28px;
  padding:40px 16px 44px; align-items:center;
}
@media (min-width:768px){ .hero-inner{ padding:48px 24px 52px; } }
@media (min-width:1024px){
  .hero-inner{ grid-template-columns:1.15fr .85fr; gap:48px; padding:56px 32px 60px; }
}
.hero-copy{ max-width:640px; }
.crumb{ display:flex; flex-wrap:wrap; align-items:center; gap:8px; font-size:13px; color:var(--text-muted); margin-bottom:16px; }
.crumb a{ color:var(--text-muted); transition:color .2s ease; }
.crumb a:hover{ color:var(--accent); }
.crumb .sep{ opacity:.6; }
.crumb .now{ color:var(--text-sub); }
.hero h1{
  font-size:clamp(28px,5vw,44px); font-weight:700; line-height:1.25; letter-spacing:0;
}
.hero h1 .hl{
  background:linear-gradient(120deg,var(--brand-300),var(--accent));
  -webkit-background-clip:text; background-clip:text; color:transparent;
}
.hero-sub{ margin-top:16px; font-size:16px; color:var(--text-sub); max-width:560px; }
.hero-cta{ display:flex; flex-wrap:wrap; gap:12px; margin-top:26px; }
.hero-stats{
  display:grid; grid-template-columns:repeat(3,minmax(0,1fr)); gap:1px;
  margin-top:30px; border-radius:var(--r-table); overflow:hidden;
  border:1px solid var(--line); background:rgba(255,255,255,.04);
}
.hero-stat{ padding:14px 12px; background:rgba(10,16,32,.6); }
.hero-stat .v{ font-size:19px; font-weight:700; color:var(--text); font-variant-numeric:tabular-nums; }
.hero-stat .k{ font-size:12px; color:var(--text-muted); margin-top:2px; }
.hero-figure{ position:relative; border-radius:var(--r-card); overflow:hidden; border:1px solid var(--line); box-shadow:var(--shadow); }
.hero-figure img{ width:100%; aspect-ratio:16/10; object-fit:cover; transition:transform .2s ease; }
.hero-figure:hover img{ transform:scale(1.03); }
.hero-figure figcaption{
  position:absolute; left:0; right:0; bottom:0; padding:12px 16px;
  font-size:13px; color:var(--text-sub);
  background:linear-gradient(180deg,rgba(5,7,15,0) 0%,rgba(5,7,15,.92) 100%);
}

/* ============ 置顶大卡 ============ */
.spotlight{
  display:grid; grid-template-columns:1fr; overflow:hidden;
  transition:border-color .25s ease, transform .25s ease;
}
@media (min-width:900px){ .spotlight{ grid-template-columns:1.05fr 1fr; } }
.spotlight:hover{ border-color:var(--line-strong); }
.spotlight-media{ position:relative; overflow:hidden; }
.spotlight-media img{ width:100%; height:100%; min-height:220px; aspect-ratio:16/10; object-fit:cover; transition:transform .2s ease; }
.spotlight:hover .spotlight-media img{ transform:scale(1.03); }
.spotlight-body{ padding:24px 22px 26px; display:flex; flex-direction:column; gap:14px; }
@media (min-width:768px){ .spotlight-body{ padding:30px 30px 32px; } }
.spotlight-body h3{ font-size:clamp(20px,2.6vw,24px); font-weight:600; line-height:1.4; }
.spotlight-body p{ font-size:15px; color:var(--text-sub); }
.meta-row{ display:flex; flex-wrap:wrap; align-items:center; gap:14px; font-size:13px; color:var(--text-muted); }
.meta-row .dot{ width:4px; height:4px; border-radius:50%; background:var(--text-muted); display:inline-block; }
.notice{
  display:flex; gap:10px; align-items:flex-start;
  padding:12px 14px; border-radius:12px;
  border:1px solid rgba(255,154,46,.32); background:rgba(255,154,46,.08);
  font-size:13px; color:var(--text-sub);
}
.notice strong{ color:var(--warn); }

/* ============ 时间轴列表 ============ */
.timeline-grid{ display:grid; grid-template-columns:1fr; gap:20px; }
@media (min-width:768px){ .timeline-grid{ grid-template-columns:1fr 1fr; gap:22px; } }
.tl-card{
  position:relative; display:flex; gap:16px;
  padding:20px 22px 20px 20px;
  border-radius:var(--r-card); border:1px solid var(--line);
  background:var(--panel); backdrop-filter:blur(12px);
  transition:border-color .25s ease, transform .25s ease, box-shadow .25s ease;
}
.tl-card::before{
  content:""; position:absolute; left:0; top:20px; bottom:20px; width:2px; border-radius:2px;
  background:linear-gradient(180deg,var(--brand-500),rgba(31,224,176,.5),transparent);
  opacity:.55;
}
.tl-card:hover{ border-color:var(--line-strong); transform:translateY(-2px); box-shadow:var(--shadow); }
.tl-time{
  flex:0 0 auto; min-width:50px; padding-top:2px;
  font-size:14px; font-weight:700; color:var(--accent); font-variant-numeric:tabular-nums;
}
.tl-body h3{ font-size:17px; font-weight:600; line-height:1.5; margin:8px 0 6px; }
.tl-body p{ font-size:14px; color:var(--text-sub); display:-webkit-box; -webkit-line-clamp:2; -webkit-box-orient:vertical; overflow:hidden; }
.link-more{
  display:inline-flex; align-items:center; gap:6px; margin-top:10px;
  font-size:14px; font-weight:600; color:var(--brand-300); transition:color .2s ease, gap .2s ease;
}
.link-more:hover{ color:var(--accent); gap:10px; }

/* ============ 适用场景 ============ */
.scene-grid{ display:grid; grid-template-columns:1fr; gap:20px; }
@media (min-width:768px){ .scene-grid{ grid-template-columns:repeat(3,minmax(0,1fr)); gap:22px; } }
.scene-card{
  position:relative; padding:26px 22px 24px; border-radius:var(--r-card);
  border:1px solid var(--line); background:var(--panel);
  backdrop-filter:blur(12px); transition:border-color .25s ease, transform .25s ease;
}
.scene-card:nth-child(2){ margin-top:0; }
@media (min-width:768px){ .scene-card:nth-child(2){ margin-top:22px; } }
.scene-card:hover{ border-color:var(--line-strong); transform:translateY(-2px); }
.scene-num{
  font-size:40px; font-weight:800; line-height:1; letter-spacing:0;
  color:transparent; -webkit-text-stroke:1px rgba(126,168,255,.55);
  margin-bottom:14px;
}
.scene-card h3{ font-size:18px; font-weight:600; margin-bottom:8px; }
.scene-card p{ font-size:14px; color:var(--text-sub); }
.scene-card ul{ margin-top:14px; display:flex; flex-direction:column; gap:8px; }
.scene-card li{ position:relative; padding-left:16px; font-size:14px; color:var(--text-sub); }
.scene-card li::before{
  content:""; position:absolute; left:0; top:9px; width:6px; height:6px; border-radius:50%;
  background:var(--accent); box-shadow:0 0 8px rgba(31,224,176,.6);
}

/* ============ 阅读路径 ============ */
.step-grid{ display:grid; grid-template-columns:1fr; gap:18px; }
@media (min-width:768px){ .step-grid{ grid-template-columns:repeat(2,minmax(0,1fr)); } }
@media (min-width:1024px){ .step-grid{ grid-template-columns:repeat(4,minmax(0,1fr)); } }
.step{
  position:relative; padding:22px 20px; border-radius:var(--r-card);
  border:1px solid var(--line); background:rgba(255,255,255,.03);
  transition:border-color .25s ease, background .25s ease;
}
.step:hover{ border-color:var(--line-strong); background:rgba(61,123,255,.08); }
.step-idx{
  display:inline-flex; align-items:center; justify-content:center;
  width:34px; height:34px; border-radius:10px; margin-bottom:12px;
  font-size:14px; font-weight:700; color:var(--brand-300);
  border:1px solid rgba(61,123,255,.4); background:rgba(61,123,255,.12);
  font-variant-numeric:tabular-nums;
}
.step h3{ font-size:16px; font-weight:600; margin-bottom:6px; }
.step p{ font-size:14px; color:var(--text-sub); }

/* ============ FAQ ============ */
.faq-list{ display:flex; flex-direction:column; gap:12px; }
.faq-item{ border-radius:var(--r-card); border:1px solid var(--line); background:var(--panel); backdrop-filter:blur(12px); overflow:hidden; }
.faq-item.is-open{ border-color:var(--line-strong); box-shadow:var(--glow); }
.faq-q{
  width:100%; display:flex; align-items:center; justify-content:space-between; gap:16px;
  padding:18px 20px; text-align:left; font-size:16px; font-weight:600; color:var(--text);
  transition:color .2s ease;
}
.faq-q:hover{ color:var(--brand-300); }
.faq-icon{ position:relative; flex:0 0 auto; width:20px; height:20px; }
.faq-icon::before,.faq-icon::after{
  content:""; position:absolute; left:50%; top:50%; transform:translate(-50%,-50%);
  background:var(--accent); border-radius:2px; transition:transform .3s ease, opacity .3s ease;
}
.faq-icon::before{ width:14px; height:2px; }
.faq-icon::after{ width:2px; height:14px; }
.faq-item.is-open .faq-icon::after{ transform:translate(-50%,-50%) rotate(90deg); opacity:0; }
.faq-a{
  max-height:0; overflow:hidden; transition:max-height .3s ease;
}
.faq-a-inner{
  padding:0 20px 20px; font-size:15px; color:var(--text-sub);
  border-top:1px solid var(--line); padding-top:16px; margin:0 20px 20px; padding-left:0; padding-right:0;
}

/* ============ 相关分类胶囊 ============ */
.pill-row{ display:flex; flex-wrap:wrap; gap:12px; }
.pill{
  display:inline-flex; align-items:center; gap:8px;
  min-height:44px; padding:0 18px; border-radius:999px;
  border:1px solid var(--line); background:rgba(255,255,255,.04);
  font-size:14px; color:var(--text-sub);
  transition:border-color .2s ease, color .2s ease, transform .2s ease, background .2s ease;
}
.pill:hover{ color:var(--text); border-color:var(--line-strong); background:rgba(61,123,255,.12); transform:translateY(-1px); }
.pill.is-current{ color:var(--text); border-color:rgba(31,224,176,.45); background:rgba(31,224,176,.10); }

/* ============ CTA 条 ============ */
.cta-bar{
  position:relative; overflow:hidden; padding:32px 22px 26px;
  display:grid; grid-template-columns:1fr; gap:24px; align-items:center;
}
@media (min-width:900px){ .cta-bar{ grid-template-columns:1.4fr .6fr; padding:38px 40px 32px; } }
.cta-bar::before{
  content:""; position:absolute; inset:0;
  background-image:linear-gradient(90deg,rgba(5,7,15,.94) 0%,rgba(10,16,32,.82) 100%),url('/assets/images/backpic/back-2.webp');
  background-size:cover; background-position:center;
  z-index:0;
}
.cta-bar > *{ position:relative; z-index:1; }
.cta-bar h2{ font-size:clamp(20px,2.8vw,26px); font-weight:600; }
.cta-bar p{ margin-top:10px; font-size:15px; color:var(--text-sub); max-width:620px; }
.cta-tags{ display:flex; flex-wrap:wrap; gap:10px; margin-top:16px; }
.cta-tags li{
  padding:5px 13px; border-radius:999px; font-size:13px; color:var(--accent);
  border:1px solid rgba(31,224,176,.3); background:rgba(31,224,176,.08);
}
.cta-action{ display:flex; flex-direction:column; gap:12px; }
.cta-action .btn{ width:100%; }
.cta-note{ margin-top:16px; font-size:13px; color:var(--text-muted); }

/* ============ 页脚 ============ */
.site-footer{
  border-top:1px solid var(--line);
  background:linear-gradient(180deg,rgba(10,16,32,.9) 0%,rgba(5,7,15,1) 100%);
  padding:52px 0 26px;
}
.foot-grid{ display:grid; grid-template-columns:1fr; gap:32px; }
@media (min-width:768px){ .foot-grid{ grid-template-columns:1.3fr 1fr 1fr 1.2fr; gap:28px; } }
.foot-title{ font-size:14px; font-weight:700; color:var(--text); margin-bottom:14px; }
.foot-link{ display:block; font-size:14px; color:var(--text-muted); padding:5px 0; transition:color .2s ease, padding-left .2s ease; }
.foot-link:hover{ color:var(--accent); padding-left:4px; }
.foot-sub{ display:flex; gap:8px; margin-top:12px; }
.input{
  flex:1 1 auto; min-width:0; min-height:44px; padding:0 14px;
  border-radius:var(--r-btn); border:1px solid var(--line);
  background:rgba(255,255,255,.04); color:var(--text); font-size:14px;
  outline:none; transition:border-color .2s ease, box-shadow .2s ease;
  appearance:none; -webkit-appearance:none;
}
.input::placeholder{ color:var(--text-muted); }
.input:focus{ border-color:var(--accent); box-shadow:0 0 0 3px rgba(31,224,176,.18); }
.foot-bottom{
  display:flex; flex-wrap:wrap; gap:10px; align-items:center; justify-content:space-between;
  margin-top:36px; padding-top:20px; border-top:1px solid var(--line);
  font-size:13px; color:var(--text-muted);
}

/* ============ 动效 ============ */
.fade-up{ opacity:0; transform:translateY(14px); transition:opacity .5s ease, transform .5s ease; }
.fade-up.is-visible{ opacity:1; transform:translateY(0); }
@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{ animation-duration:.001ms !important; animation-iteration-count:1 !important; transition-duration:.001ms !important; }
  .fade-up{ opacity:1; transform:none; }
  html{ scroll-behavior:auto; }
}

/* roulang page: category2 */
:root{
    --bg-0:#05070F;
    --bg-1:#0A1020;
    --panel:rgba(18,26,44,.62);
    --panel-solid:rgba(12,18,34,.92);
    --brand-300:#7EA8FF;
    --brand-500:#3D7BFF;
    --brand-700:#1B4BD8;
    --accent:#1FE0B0;
    --warn:#FF9A2E;
    --text:#E8EEFA;
    --text-2:#A7B4CC;
    --text-3:#6B7A99;
    --line:rgba(120,160,255,.14);
    --line-strong:rgba(120,160,255,.3);
    --r-card:16px;
    --r-btn:12px;
    --shadow-card:0 10px 30px rgba(0,0,0,.35);
    --glow:0 0 0 1px rgba(61,123,255,.35), 0 8px 30px rgba(31,90,255,.28);
    --sec-y:56px;
  }
  *,*::before,*::after{box-sizing:border-box}
  html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
  body{
    margin:0;
    background:var(--bg-0);
    color:var(--text);
    font-family:-apple-system,"PingFang SC","Microsoft YaHei","Noto Sans SC",sans-serif;
    font-size:16px;
    line-height:1.75;
    letter-spacing:0;
    -webkit-font-smoothing:antialiased;
  }
  body.no-scroll{overflow:hidden}
  h1,h2,h3,h4,p,ul,ol,figure{margin:0}
  ul,ol{padding:0;list-style:none}
  a{color:inherit;text-decoration:none}
  img{max-width:100%;display:block}
  button,input{font:inherit;color:inherit}
  button{background:none;border:0;cursor:pointer}
  :focus-visible{outline:2px solid var(--accent);outline-offset:2px;border-radius:8px}
  .num{font-variant-numeric:tabular-nums}

  .container-x{width:100%;max-width:1200px;margin:0 auto;padding:0 16px}
  @media (min-width:768px){.container-x{padding:0 24px}}
  @media (min-width:1024px){.container-x{padding:0 32px}}
  @media (min-width:1024px){:root{--sec-y:96px}}
  @media (min-width:768px) and (max-width:1023px){:root{--sec-y:72px}}

  .glass{
    background:var(--panel);
    border:1px solid var(--line);
    border-radius:var(--r-card);
    backdrop-filter:blur(14px);
    -webkit-backdrop-filter:blur(14px);
    box-shadow:var(--shadow-card);
  }

  /* ---------- header ---------- */
  .site-header{
    position:sticky;
    top:0;
    z-index:60;
    background:rgba(7,12,24,.7);
    backdrop-filter:blur(18px);
    -webkit-backdrop-filter:blur(18px);
    border-bottom:1px solid var(--line);
    transition:background .25s ease, box-shadow .25s ease;
  }
  .site-header.scrolled{
    background:rgba(5,7,15,.94);
    box-shadow:0 12px 30px rgba(0,0,0,.45);
  }
  .nav-inner{
    min-height:62px;
    display:flex;
    align-items:center;
    gap:16px;
  }
  .logo{display:inline-flex;align-items:center;gap:10px;flex:0 0 auto}
  .logo svg{flex:0 0 auto}
  .logo-text{font-size:17px;font-weight:700;color:#fff;letter-spacing:0;white-space:nowrap}
  .nav-links{display:none;align-items:center;gap:4px;margin-left:auto}
  .nav-link{
    position:relative;
    display:inline-flex;
    align-items:center;
    min-height:44px;
    padding:0 12px;
    font-size:14.5px;
    color:var(--text-2);
    border-radius:10px;
    transition:color .18s ease, background-color .18s ease;
  }
  .nav-link::after{
    content:"";
    position:absolute;
    left:50%;
    bottom:6px;
    width:0;
    height:2px;
    border-radius:2px;
    background:linear-gradient(90deg,var(--brand-500),var(--accent));
    transform:translateX(-50%);
    transition:width .22s ease;
  }
  .nav-link:hover{color:var(--text);background:rgba(255,255,255,.04)}
  .nav-link.is-active{color:var(--text);font-weight:600}
  .nav-link.is-active::after{width:22px;box-shadow:0 0 12px rgba(61,123,255,.85)}
  .nav-actions{display:flex;align-items:center;gap:10px;margin-left:auto}
  .nav-login{display:none;font-size:14.5px;color:var(--text-2);padding:0 6px;transition:color .18s ease}
  .nav-login:hover{color:var(--accent)}
  .nav-actions .btn{margin-left:0}
  .hamburger{
    display:inline-flex;
    flex-direction:column;
    justify-content:center;
    gap:5px;
    width:44px;
    height:44px;
    padding:0 10px;
    border:1px solid var(--line);
    border-radius:12px;
    background:rgba(255,255,255,.04);
  }
  .hamburger span{display:block;height:2px;border-radius:2px;background:var(--text);transition:transform .22s ease, opacity .22s ease}
  .hamburger[aria-expanded="true"] span:nth-child(1){transform:translateY(7px) rotate(45deg)}
  .hamburger[aria-expanded="true"] span:nth-child(2){opacity:0}
  .hamburger[aria-expanded="true"] span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}
  .mobile-drawer{
    position:fixed;
    left:0;
    right:0;
    top:62px;
    bottom:0;
    z-index:55;
    background:rgba(5,7,15,.97);
    backdrop-filter:blur(16px);
    -webkit-backdrop-filter:blur(16px);
    padding:18px 16px 32px;
    overflow-y:auto;
    opacity:0;
    visibility:hidden;
    transform:translateY(-10px);
    transition:opacity .24s ease, transform .24s ease, visibility .24s;
  }
  .mobile-drawer.is-open{opacity:1;visibility:visible;transform:translateY(0)}
  .drawer-title{font-size:13px;color:var(--text-3);margin:10px 0 6px}
  .drawer-link{
    display:flex;
    align-items:center;
    justify-content:space-between;
    min-height:52px;
    padding:0 14px;
    border-radius:12px;
    font-size:15.5px;
    color:var(--text-2);
    border:1px solid transparent;
  }
  .drawer-link.is-active{color:var(--text);background:rgba(61,123,255,.14);border-color:rgba(61,123,255,.36)}
  .drawer-foot{margin-top:18px;display:grid;gap:10px}
  @media (min-width:768px){
    .nav-links{display:flex}
    .nav-login{display:inline-flex}
    .hamburger{display:none}
    .nav-actions{margin-left:8px}
  }
  @media (min-width:1024px){
    .nav-inner{gap:24px}
    .nav-link{padding:0 14px}
    .nav-actions{gap:14px}
  }

  /* ---------- buttons ---------- */
  .btn{
    display:inline-flex;
    align-items:center;
    justify-content:center;
    gap:8px;
    min-height:44px;
    padding:0 22px;
    border-radius:var(--r-btn);
    font-size:15px;
    font-weight:600;
    border:1px solid transparent;
    white-space:nowrap;
    transition:transform .18s ease, box-shadow .18s ease, border-color .18s ease, background-color .18s ease, color .18s ease;
  }
  .btn-primary{
    background:linear-gradient(135deg,#3D7BFF,#1B4BD8);
    color:#fff;
    box-shadow:var(--glow);
  }
  .btn-primary:hover{transform:translateY(-1px);box-shadow:0 0 0 1px rgba(61,123,255,.55),0 14px 36px rgba(31,90,255,.42)}
  .btn-primary:active{transform:translateY(0);box-shadow:0 0 0 1px rgba(61,123,255,.4)}
  .btn-secondary{
    background:rgba(255,255,255,.04);
    border-color:var(--line);
    color:var(--text);
  }
  .btn-secondary:hover{border-color:var(--line-strong);background:rgba(255,255,255,.07);transform:translateY(-1px)}
  .btn-ghost{color:var(--text-2);padding:0 8px}
  .btn-ghost:hover{color:var(--accent)}
  .btn-sm{min-height:38px;padding:0 16px;font-size:14px;border-radius:10px}
  .btn[disabled],.btn.is-disabled{opacity:.4;pointer-events:none}
  .pulse{animation:breathe 3.4s ease-in-out infinite}
  @keyframes breathe{
    0%,100%{box-shadow:0 0 0 1px rgba(61,123,255,.35),0 8px 30px rgba(31,90,255,.24)}
    50%{box-shadow:0 0 0 1px rgba(61,123,255,.5),0 10px 34px rgba(31,90,255,.4)}
  }

  /* ---------- badges ---------- */
  .badge{
    display:inline-flex;
    align-items:center;
    gap:6px;
    padding:4px 12px;
    border-radius:999px;
    font-size:12.5px;
    line-height:1.7;
    border:1px solid transparent;
  }
  .badge-accent{background:rgba(31,224,176,.12);color:var(--accent);border-color:rgba(31,224,176,.32)}
  .badge-brand{background:rgba(61,123,255,.12);color:var(--brand-300);border-color:rgba(61,123,255,.3)}
  .badge-plain{background:rgba(255,255,255,.05);color:var(--text-2);border-color:var(--line)}

  /* ---------- hero ---------- */
  .page-hero{
    position:relative;
    overflow:hidden;
    padding:44px 0 56px;
    background:var(--bg-0);
  }
  .hero-bg-img{
    position:absolute;
    inset:0;
    background-image:url('/assets/images/backpic/back-1.webp');
    background-size:cover;
    background-position:center;
    opacity:.2;
  }
  .hero-gridlines{
    position:absolute;
    inset:0;
    background-image:
      linear-gradient(rgba(120,160,255,.07) 1px, transparent 1px),
      linear-gradient(90deg, rgba(120,160,255,.07) 1px, transparent 1px);
    background-size:52px 52px;
    -webkit-mask-image:linear-gradient(180deg, rgba(0,0,0,.95), transparent 88%);
    mask-image:linear-gradient(180deg, rgba(0,0,0,.95), transparent 88%);
    pointer-events:none;
  }
  .hero-glow{
    position:absolute;
    top:-160px;
    right:-140px;
    width:520px;
    height:520px;
    background:radial-gradient(circle, rgba(61,123,255,.3), rgba(61,123,255,0) 66%);
    pointer-events:none;
  }
  .hero-slash{
    position:absolute;
    left:0;
    right:0;
    bottom:-70px;
    height:150px;
    background:linear-gradient(90deg, rgba(31,224,176,.08), rgba(61,123,255,.05) 60%, transparent);
    transform:skewY(-4deg);
    pointer-events:none;
  }
  .page-hero .container-x{position:relative;z-index:1}
  .breadcrumb{display:flex;align-items:center;gap:8px;font-size:13px;color:var(--text-3);margin-bottom:20px;flex-wrap:wrap}
  .breadcrumb a{transition:color .18s ease}
  .breadcrumb a:hover{color:var(--accent)}
  .breadcrumb .sep{color:rgba(107,122,153,.6)}
  .hero-inner{max-width:820px;margin:0 auto;text-align:center;display:grid;gap:18px;justify-items:center}
  .page-hero h1{
    font-size:clamp(26px,4.6vw,42px);
    line-height:1.28;
    font-weight:700;
    color:#fff;
  }
  .page-hero h1 em{font-style:normal;color:var(--brand-300)}
  .hero-sub{font-size:16px;color:var(--text-2);max-width:640px}
  .hero-lead{font-size:15px;color:var(--text-3);max-width:700px}
  .hero-cta{display:flex;flex-wrap:wrap;gap:12px;justify-content:center;margin-top:4px}
  .hero-facts{
    display:flex;
    flex-wrap:wrap;
    gap:10px 22px;
    justify-content:center;
    margin-top:14px;
    font-size:13.5px;
    color:var(--text-2);
  }
  .hero-facts li{display:inline-flex;align-items:center;gap:8px}
  .dot{width:6px;height:6px;border-radius:50%;background:var(--accent);flex:0 0 auto}

  /* ---------- sections ---------- */
  .section{padding:var(--sec-y) 0}
  .section-tight{padding:calc(var(--sec-y) * .7) 0}
  .sec-head{max-width:720px;margin-bottom:36px}
  .sec-head.center{margin-left:auto;margin-right:auto;text-align:center}
  .sec-label{font-size:13px;letter-spacing:0;color:var(--accent);font-weight:600;margin-bottom:10px}
  h2.sec-title{font-size:clamp(22px,3vw,30px);font-weight:600;color:#fff;line-height:1.35}
  .sec-desc{margin-top:12px;font-size:15.5px;color:var(--text-2)}

  /* ---------- zigzag ---------- */
  .zig-list{display:grid;gap:40px}
  .zig{
    display:grid;
    grid-template-columns:1fr;
    gap:22px;
    align-items:center;
  }
  .zig-media{
    position:relative;
    border-radius:var(--r-card);
    overflow:hidden;
    border:1px solid var(--line);
    background:var(--bg-1);
  }
  .zig-media img{
    width:100%;
    aspect-ratio:4/3;
    object-fit:cover;
    transition:transform .2s ease;
  }
  .zig:hover .zig-media img{transform:scale(1.03)}
  .zig-media .tag{
    position:absolute;
    left:14px;
    top:14px;
    z-index:2;
  }
  .zig-body{
    background:var(--panel);
    border:1px solid var(--line);
    border-radius:var(--r-card);
    padding:24px;
    backdrop-filter:blur(12px);
    -webkit-backdrop-filter:blur(12px);
  }
  .zig-index{
    font-size:13px;
    font-weight:700;
    color:var(--brand-300);
    letter-spacing:0;
    margin-bottom:10px;
    display:block;
  }
  .zig-body h3{font-size:20px;font-weight:600;color:#fff;line-height:1.4;margin-bottom:12px}
  .zig-body p{font-size:15.5px;color:var(--text-2);margin-bottom:12px}
  .zig-points{display:grid;gap:10px;margin-top:6px}
  .zig-points li{
    display:flex;
    gap:10px;
    align-items:flex-start;
    font-size:14.5px;
    color:var(--text-2);
    padding-top:10px;
    border-top:1px solid var(--line);
  }
  .zig-points li:first-child{border-top:0;padding-top:0}
  .zig-points .dot{margin-top:9px}
  .zig-points b{color:var(--text);font-weight:600}
  @media (min-width:1024px){
    .zig{grid-template-columns:minmax(0,380px) minmax(0,1fr);gap:48px}
    .zig.reverse{grid-template-columns:minmax(0,1fr) minmax(0,380px)}
    .zig.reverse .zig-media{order:2}
    .zig.reverse .zig-body{order:1}
    .zig-body{padding:28px}
    .zig-list{gap:52px}
  }

  /* ---------- metrics ---------- */
  .metrics{
    display:grid;
    grid-template-columns:1fr;
    gap:1px;
    background:var(--line);
    border:1px solid var(--line);
    border-radius:14px;
    overflow:hidden;
  }
  .metric{
    background:rgba(12,18,34,.8);
    padding:22px 20px;
  }
  .metric .k{font-size:13px;color:var(--text-3);margin-bottom:6px}
  .metric .v{font-size:20px;font-weight:600;color:#fff;line-height:1.4}
  .metric .v span{font-size:13.5px;font-weight:400;color:var(--accent);margin-left:6px}
  @media (min-width:640px){.metrics{grid-template-columns:repeat(2,1fr)}}
  @media (min-width:1024px){.metrics{grid-template-columns:repeat(4,1fr)}}

  /* ---------- steps ---------- */
  .steps{display:grid;gap:18px;grid-template-columns:1fr}
  .step{
    position:relative;
    padding:24px 22px;
    border-radius:var(--r-card);
    border:1px solid var(--line);
    background:linear-gradient(180deg, rgba(18,26,44,.72), rgba(10,16,32,.6));
    transition:border-color .2s ease, transform .2s ease;
  }
  .step:hover{border-color:var(--line-strong);transform:translateY(-2px)}
  .step-no{
    display:inline-flex;
    align-items:center;
    justify-content:center;
    width:34px;
    height:34px;
    border-radius:10px;
    border:1px solid rgba(61,123,255,.4);
    color:var(--brand-300);
    font-size:14px;
    font-weight:700;
    margin-bottom:14px;
  }
  .step h3{font-size:17px;font-weight:600;color:#fff;margin-bottom:8px}
  .step p{font-size:14.5px;color:var(--text-2)}
  @media (min-width:640px){.steps{grid-template-columns:repeat(2,1fr);gap:20px}}
  @media (min-width:1024px){.steps{grid-template-columns:repeat(4,1fr);gap:22px}}

  /* ---------- faq ---------- */
  .faq-wrap{display:grid;gap:12px}
  .faq-item{
    background:var(--panel);
    border:1px solid var(--line);
    border-radius:14px;
    backdrop-filter:blur(12px);
    -webkit-backdrop-filter:blur(12px);
    overflow:hidden;
    transition:border-color .2s ease;
  }
  .faq-item.is-open{border-color:rgba(61,123,255,.42)}
  .faq-q{
    width:100%;
    display:flex;
    align-items:center;
    justify-content:space-between;
    gap:16px;
    padding:18px 20px;
    text-align:left;
    font-size:16px;
    font-weight:600;
    color:var(--text);
    min-height:56px;
  }
  .faq-q:hover{color:#fff}
  .faq-icon{
    flex:0 0 auto;
    width:26px;
    height:26px;
    border-radius:8px;
    border:1px solid var(--line-strong);
    position:relative;
    transition:border-color .2s ease, background-color .2s ease;
  }
  .faq-icon::before,.faq-icon::after{
    content:"";
    position:absolute;
    left:50%;
    top:50%;
    background:var(--brand-300);
    transform:translate(-50%,-50%);
    transition:transform .25s ease, opacity .25s ease;
  }
  .faq-icon::before{width:12px;height:2px;border-radius:2px}
  .faq-icon::after{width:2px;height:12px;border-radius:2px}
  .faq-item.is-open .faq-icon{border-color:rgba(31,224,176,.6);background:rgba(31,224,176,.1)}
  .faq-item.is-open .faq-icon::before{background:var(--accent)}
  .faq-item.is-open .faq-icon::after{transform:translate(-50%,-50%) scaleY(0);opacity:0}
  .faq-a{
    max-height:0;
    overflow:hidden;
    transition:max-height .3s ease;
  }
  .faq-a p{
    padding:0 20px 20px;
    font-size:15px;
    color:var(--text-2);
    border-top:1px solid var(--line);
    padding-top:14px;
    margin:0 20px 20px;
    padding-left:0;
    padding-right:0;
  }

  /* ---------- cta ---------- */
  .cta-band{
    position:relative;
    overflow:hidden;
    border-radius:20px;
    border:1px solid var(--line);
    padding:36px 24px;
  }
  .cta-band::before{
    content:"";
    position:absolute;
    inset:0;
    background-image:url('/assets/images/backpic/back-2.webp');
    background-size:cover;
    background-position:center;
    opacity:.32;
  }
  .cta-band::after{
    content:"";
    position:absolute;
    inset:0;
    background:linear-gradient(120deg, rgba(5,7,15,.94), rgba(10,16,32,.78) 55%, rgba(5,7,15,.9));
  }
  .cta-band .cta-inner{position:relative;z-index:2;display:grid;gap:20px}
  .cta-band h2{font-size:clamp(21px,3vw,28px);font-weight:600;color:#fff;line-height:1.35}
  .cta-band p{font-size:15.5px;color:var(--text-2);max-width:620px}
  .pill-row{display:flex;flex-wrap:wrap;gap:10px}
  .cta-actions{display:flex;flex-wrap:wrap;gap:12px;align-items:center}
  .cta-note{font-size:13px;color:var(--text-3);margin-top:14px}
  @media (min-width:1024px){
    .cta-band{padding:46px 44px}
  }

  /* ---------- related ---------- */
  .rel-cats{display:flex;flex-wrap:wrap;gap:12px}
  .rel-cat{
    display:inline-flex;
    align-items:center;
    gap:8px;
    min-height:44px;
    padding:0 18px;
    border-radius:999px;
    border:1px solid var(--line);
    background:rgba(255,255,255,.04);
    font-size:14.5px;
    color:var(--text-2);
    transition:border-color .2s ease, color .2s ease, transform .2s ease;
  }
  .rel-cat:hover{border-color:var(--line-strong);color:#fff;transform:translateY(-2px)}
  .rel-cat.is-current{border-color:rgba(31,224,176,.5);color:var(--accent);background:rgba(31,224,176,.08)}

  /* ---------- footer ---------- */
  .site-footer{
    margin-top:var(--sec-y);
    padding:56px 0 24px;
    border-top:1px solid var(--line);
    background:linear-gradient(180deg, rgba(10,16,32,.7), rgba(5,7,15,.96));
  }
  .foot-grid{display:grid;grid-template-columns:1fr;gap:30px}
  .foot-title{font-size:14px;font-weight:600;color:var(--text);margin-bottom:12px}
  .foot-link{display:block;font-size:14px;color:var(--text-3);padding:6px 0;transition:color .18s ease, padding-left .18s ease}
  .foot-link:hover{color:var(--accent);padding-left:4px}
  .foot-sub{display:flex;gap:10px;margin-top:14px;flex-wrap:wrap}
  .input{
    flex:1 1 170px;
    min-width:0;
    min-height:44px;
    padding:0 14px;
    border-radius:10px;
    background:rgba(255,255,255,.04);
    border:1px solid var(--line);
    color:var(--text);
    outline:none;
    transition:border-color .18s ease, box-shadow .18s ease;
  }
  .input::placeholder{color:#5B6883}
  .input:focus{border-color:var(--accent);box-shadow:0 0 0 3px rgba(31,224,176,.16)}
  .input.is-error{border-color:var(--warn);box-shadow:0 0 0 3px rgba(255,154,46,.14)}
  .field-hint{font-size:13px;color:var(--text-3);margin-top:8px}
  .foot-bottom{
    display:flex;
    justify-content:space-between;
    align-items:center;
    gap:12px;
    flex-wrap:wrap;
    margin-top:36px;
    padding-top:20px;
    border-top:1px solid var(--line);
    font-size:13px;
    color:var(--text-3);
  }
  @media (min-width:768px){.foot-grid{grid-template-columns:repeat(2,1fr);gap:34px}}
  @media (min-width:1024px){.foot-grid{grid-template-columns:1.45fr 1fr 1fr 1.3fr;gap:40px}}

  .fade-up{opacity:0;transform:translateY(14px);transition:opacity .5s ease, transform .5s ease}
  .fade-up.is-in{opacity:1;transform:none}

  @media (prefers-reduced-motion: reduce){
    *{animation:none !important;transition:none !important}
    .fade-up{opacity:1;transform:none}
    html{scroll-behavior:auto}
  }

/* roulang page: category3 */
:root{
    --bg-0:#05070F;
    --bg-1:#0A1020;
    --panel:rgba(18,26,44,.62);
    --panel-soft:rgba(18,26,44,.42);
    --brand-500:#3D7BFF;
    --brand-700:#1B4BD8;
    --brand-300:#7EA8FF;
    --accent:#1FE0B0;
    --warn:#FF9A2E;
    --ink:#E8EEFA;
    --ink-2:#A7B4CC;
    --ink-3:#6B7A99;
    --line:rgba(120,160,255,.14);
    --line-strong:rgba(61,123,255,.5);
    --radius-card:16px;
    --radius-btn:12px;
    --radius-tbl:14px;
    --shadow-card:0 10px 30px rgba(0,0,0,.35);
    --shadow-glow:0 0 0 1px rgba(61,123,255,.35), 0 8px 30px rgba(31,90,255,.28);
    --pad-x:16px;
    --sec-y:56px;
  }
  @media (min-width:768px){ :root{ --pad-x:24px; --sec-y:72px; } }
  @media (min-width:1024px){ :root{ --pad-x:32px; --sec-y:96px; } }

  *,*::before,*::after{ box-sizing:border-box; }
  html{ scroll-behavior:smooth; -webkit-text-size-adjust:100%; }
  body{
    margin:0;
    font-family:-apple-system,"PingFang SC","Microsoft YaHei","Noto Sans SC",sans-serif;
    font-size:16px;
    line-height:1.75;
    letter-spacing:0;
    color:var(--ink);
    background:
      radial-gradient(900px 520px at 78% -8%, rgba(61,123,255,.16), transparent 62%),
      radial-gradient(700px 460px at 6% 14%, rgba(31,224,176,.08), transparent 60%),
      linear-gradient(180deg,#05070F 0%,#0A1020 54%,#05070F 100%);
    background-attachment:fixed;
    overflow-x:hidden;
  }
  body::after{
    content:"";position:fixed;inset:0;pointer-events:none;z-index:0;
    background-image:
      linear-gradient(rgba(120,160,255,.05) 1px, transparent 1px),
      linear-gradient(90deg, rgba(120,160,255,.05) 1px, transparent 1px);
    background-size:64px 64px;
    -webkit-mask-image:radial-gradient(circle at 50% 0%, rgba(0,0,0,.85), transparent 72%);
    mask-image:radial-gradient(circle at 50% 0%, rgba(0,0,0,.85), transparent 72%);
  }
  img{ max-width:100%; display:block; }
  a{ color:inherit; text-decoration:none; }
  button,input{ font:inherit; color:inherit; }
  ul,ol{ margin:0; padding:0; list-style:none; }
  h1,h2,h3,h4,p{ margin:0; }
  ::selection{ background:rgba(61,123,255,.35); }
  :focus-visible{ outline:2px solid var(--accent); outline-offset:2px; border-radius:6px; }

  .container-x{
    width:100%; max-width:1200px; margin:0 auto;
    padding-left:var(--pad-x); padding-right:var(--pad-x);
  }
  .site-header,.page-hero,.section,.site-footer{ position:relative; z-index:1; }
  .num{ font-variant-numeric:tabular-nums; }

  /* ---------- header ---------- */
  .site-header{
    position:sticky; top:0; z-index:60;
    background:rgba(7,12,24,.70);
    backdrop-filter:blur(20px);
    -webkit-backdrop-filter:blur(20px);
    border-bottom:1px solid var(--line);
    transition:background .25s ease, box-shadow .25s ease;
  }
  .site-header.is-scrolled{ background:rgba(5,7,15,.94); box-shadow:0 10px 30px rgba(0,0,0,.45); }
  .header-inner{
    display:flex; align-items:center; justify-content:space-between; gap:16px;
    min-height:62px; width:100%;
  }
  .logo{ display:inline-flex; align-items:center; gap:9px; }
  .logo-text{ font-size:17px; font-weight:700; letter-spacing:0; color:var(--ink); white-space:nowrap; }
  .nav-links{ display:none; align-items:center; gap:2px; }
  .nav-link{
    position:relative; padding:8px 12px; font-size:14.5px; color:var(--ink-2);
    border-radius:10px; transition:color .2s ease, background .2s ease; white-space:nowrap;
  }
  .nav-link:hover{ color:var(--ink); background:rgba(255,255,255,.04); }
  .nav-link.is-active{ color:var(--ink); }
  .nav-link.is-active::after{
    content:""; position:absolute; left:12px; right:12px; bottom:1px; height:2px; border-radius:2px;
    background:linear-gradient(90deg,var(--brand-500),var(--accent));
    box-shadow:0 0 12px rgba(61,123,255,.8);
  }
  .header-actions{ display:flex; align-items:center; gap:10px; }
  .ghost-link{ display:none; font-size:14px; color:var(--ink-2); padding:9px 10px; border-radius:10px; transition:color .2s ease; }
  .ghost-link:hover{ color:var(--accent); }
  .menu-toggle{
    width:44px; height:44px; display:inline-flex; align-items:center; justify-content:center;
    background:rgba(255,255,255,.04); border:1px solid var(--line); border-radius:12px; cursor:pointer;
    transition:border-color .2s ease, background .2s ease;
  }
  .menu-toggle:hover{ border-color:var(--line-strong); background:rgba(61,123,255,.12); }
  .mobile-drawer{
    position:fixed; left:0; right:0; top:62px; bottom:0; z-index:55;
    display:none; flex-direction:column; gap:6px;
    padding:20px 16px 28px; overflow-y:auto;
    background:rgba(6,10,20,.98);
    backdrop-filter:blur(14px); -webkit-backdrop-filter:blur(14px);
    border-top:1px solid var(--line);
  }
  .mobile-drawer.is-open{ display:flex; }
  .drawer-link{
    padding:14px 12px; border-radius:12px; font-size:16px; color:var(--ink-2);
    border:1px solid transparent; transition:background .2s ease, color .2s ease, border-color .2s ease;
  }
  .drawer-link:hover{ color:var(--ink); background:rgba(255,255,255,.04); }
  .drawer-link.is-active{ color:var(--ink); background:rgba(61,123,255,.12); border-color:rgba(61,123,255,.35); }
  .drawer-foot{ margin-top:auto; padding-top:22px; border-top:1px solid var(--line); }
  body.no-scroll{ overflow:hidden; }
  @media (min-width:640px){ .ghost-link{ display:inline-block; } }
  @media (min-width:1024px){
    .nav-links{ display:flex; }
    .menu-toggle{ display:none; }
    .mobile-drawer{ display:none !important; }
  }

  /* ---------- buttons ---------- */
  .btn{
    display:inline-flex; align-items:center; justify-content:center; gap:8px;
    min-height:44px; padding:0 20px; border-radius:var(--radius-btn);
    font-size:15px; font-weight:600; cursor:pointer; border:1px solid transparent;
    transition:transform .18s ease, box-shadow .22s ease, background .22s ease, border-color .22s ease, color .22s ease;
  }
  .btn-sm{ min-height:38px; padding:0 16px; font-size:14px; }
  .btn-primary{
    background:linear-gradient(135deg,#3D7BFF 0%,#1B4BD8 100%);
    color:#fff; box-shadow:var(--shadow-glow);
  }
  .btn-primary:hover{ transform:translateY(-1px); box-shadow:0 0 0 1px rgba(61,123,255,.5), 0 12px 36px rgba(31,90,255,.42); }
  .btn-primary:active{ transform:translateY(1px); box-shadow:0 0 0 1px rgba(61,123,255,.4), 0 4px 14px rgba(31,90,255,.32); }
  .btn-secondary{
    background:rgba(255,255,255,.05); border-color:var(--line); color:var(--ink);
  }
  .btn-secondary:hover{ border-color:var(--line-strong); background:rgba(61,123,255,.12); transform:translateY(-1px); }
  .btn-secondary:active{ transform:translateY(1px); }
  .btn-ghost{ background:transparent; color:var(--ink-2); padding:0 8px; }
  .btn-ghost:hover{ color:var(--accent); }
  .btn[disabled],.btn.is-disabled{ opacity:.4; pointer-events:none; }
  .is-breathe{ animation:breathe 3.6s ease-in-out infinite; }
  @keyframes breathe{
    0%,100%{ box-shadow:0 0 0 1px rgba(61,123,255,.35), 0 8px 30px rgba(31,90,255,.28); }
    50%{ box-shadow:0 0 0 1px rgba(61,123,255,.5), 0 11px 38px rgba(31,90,255,.44); }
  }

  /* ---------- badges & tags ---------- */
  .tag{
    display:inline-flex; align-items:center; gap:6px; padding:5px 12px; border-radius:999px;
    font-size:12.5px; font-weight:600; letter-spacing:0;
    color:var(--accent); background:rgba(31,224,176,.12); border:1px solid rgba(31,224,176,.3);
  }
  .badge{
    display:inline-flex; align-items:center; gap:6px; padding:4px 11px; border-radius:999px;
    font-size:12.5px; color:var(--brand-300); background:rgba(61,123,255,.12); border:1px solid var(--line);
  }
  .badge-rec{
    color:#fff; background:linear-gradient(135deg,rgba(61,123,255,.9),rgba(27,75,216,.9));
    border:1px solid rgba(126,168,255,.65); box-shadow:0 0 0 1px rgba(61,123,255,.25);
  }

  /* ---------- cards ---------- */
  .card{
    background:var(--panel); border:1px solid var(--line); border-radius:var(--radius-card);
    backdrop-filter:blur(12px); -webkit-backdrop-filter:blur(12px);
    box-shadow:var(--shadow-card);
  }

  /* ---------- hero ---------- */
  .page-hero{ padding-top:34px; padding-bottom:var(--sec-y); }
  .crumbs{ display:flex; align-items:center; flex-wrap:wrap; gap:8px; font-size:13.5px; color:var(--ink-3); margin-bottom:22px; }
  .crumbs a{ color:var(--ink-2); transition:color .2s ease; }
  .crumbs a:hover{ color:var(--accent); }
  .crumbs .cur{ color:var(--ink-3); }
  .crumbs .sep{ color:rgba(107,122,153,.6); }
  .hero-grid{
    display:grid; grid-template-columns:1fr; gap:28px; align-items:center;
    background:var(--panel-soft); border:1px solid var(--line); border-radius:var(--radius-card);
    padding:24px; position:relative; overflow:hidden;
  }
  .hero-grid::before{
    content:""; position:absolute; inset:0; pointer-events:none;
    background:
      linear-gradient(115deg, rgba(61,123,255,.14) 0%, transparent 42%),
      linear-gradient(295deg, rgba(31,224,176,.10) 0%, transparent 38%);
  }
  .hero-copy,.hero-media{ position:relative; z-index:1; }
  .hero-copy h1{
    font-size:clamp(28px,4.6vw,42px); font-weight:700; line-height:1.28; margin:14px 0 10px;
  }
  .hero-sub{ font-size:clamp(17px,2.2vw,20px); font-weight:600; color:var(--brand-300); }
  .hero-desc{ margin-top:14px; font-size:15.5px; color:var(--ink-2); max-width:620px; }
  .hero-actions{ display:flex; flex-wrap:wrap; gap:12px; margin-top:24px; }
  .hero-facts{ display:flex; flex-wrap:wrap; gap:26px; margin-top:26px; padding-top:20px; border-top:1px solid var(--line); }
  .fact b{ display:block; font-size:26px; font-weight:700; line-height:1.2; font-variant-numeric:tabular-nums;
    background:linear-gradient(120deg,#E8EEFA,#7EA8FF); -webkit-background-clip:text; background-clip:text; color:transparent; }
  .fact span{ font-size:13px; color:var(--ink-3); }
  .hero-media img{
    width:100%; aspect-ratio:16/10; object-fit:cover; border-radius:14px;
    border:1px solid var(--line); box-shadow:var(--shadow-card);
    transition:transform .2s ease;
  }
  .hero-media img:hover{ transform:scale(1.02); }
  @media (min-width:1024px){
    .hero-grid{ grid-template-columns:1.05fr .95fr; gap:40px; padding:34px 38px; }
  }

  /* ---------- section shell ---------- */
  .section{ padding-top:var(--sec-y); }
  .section:last-of-type{ padding-bottom:var(--sec-y); }
  .sec-head{ max-width:760px; margin-bottom:32px; }
  .sec-head h2{ font-size:clamp(24px,3.1vw,32px); font-weight:600; line-height:1.35; }
  .sec-head p{ margin-top:12px; color:var(--ink-2); font-size:15.5px; }
  .eyebrow{ font-size:13px; letter-spacing:0; color:var(--accent); font-weight:600; }

  /* ---------- compare table ---------- */
  .table-wrap{
    background:var(--panel); border:1px solid var(--line); border-radius:var(--radius-tbl);
    backdrop-filter:blur(12px); -webkit-backdrop-filter:blur(12px);
    box-shadow:var(--shadow-card); overflow:hidden;
  }
  .cmp-table{ width:100%; border-collapse:collapse; }
  .cmp-table thead th{
    position:sticky; top:62px; z-index:2;
    padding:16px 18px; font-size:14px; font-weight:600; text-align:left;
    background:rgba(10,16,32,.96); color:var(--ink-2);
    border-bottom:1px solid var(--line);
  }
  .cmp-table thead th:first-child{ color:var(--ink); }
  .cmp-table .col-member{ background:rgba(61,123,255,.09); color:var(--brand-300); }
  .cmp-table .col-top{ background:rgba(31,224,176,.09); color:var(--accent); }
  .cmp-table tbody th{
    text-align:left; font-weight:600; font-size:15px; color:var(--ink);
    padding:16px 18px; border-bottom:1px solid var(--line);
  }
  .cmp-table tbody td{
    padding:16px 18px; font-size:14.5px; color:var(--ink-2);
    border-bottom:1px solid var(--line);
  }
  .cmp-table tbody tr:last-child th,
  .cmp-table tbody tr:last-child td{ border-bottom:none; }
  .cmp-table tbody tr:nth-child(even){ background:rgba(255,255,255,.02); }
  .cmp-table tbody tr:hover{ background:rgba(255,255,255,.045); }
  .cmp-table td.col-member{ background:rgba(61,123,255,.06); }
  .cmp-table td.col-top{ background:rgba(31,224,176,.07); }
  .cell-yes,.cell-no{ display:inline-flex; align-items:center; gap:8px; }
  .table-note{ margin-top:14px; font-size:13px; color:var(--ink-3); }
  @media (max-width:767px){
    .cmp-table thead{ display:none; }
    .cmp-table, .cmp-table tbody, .cmp-table tr, .cmp-table th, .cmp-table td{ display:block; width:100%; }
    .cmp-table tbody tr{
      margin:0 0 14px; padding:16px; border-radius:14px;
      background:rgba(18,26,44,.62); border:1px solid var(--line);
    }
    .cmp-table tbody th{
      padding:0 0 12px; font-size:16px; border-bottom:1px solid var(--line);
    }
    .cmp-table tbody td{
      padding:12px 0 0; border-bottom:none; background:transparent !important;
    }
    .cmp-table tbody td::before{
      content:attr(data-label); display:block; font-size:12.5px; color:var(--ink-3); margin-bottom:4px;
    }
    .cmp-table tbody td.col-member{ color:var(--brand-300); }
    .cmp-table tbody td.col-top{ color:var(--accent); }
    .cmp-table thead th{ position:static; }
  }

  /* ---------- tier cards 2x2 ---------- */
  .tier-grid{ display:grid; grid-template-columns:1fr; gap:20px; }
  @media (min-width:768px){ .tier-grid{ grid-template-columns:1fr 1fr; gap:24px; } }
  .tier-card{
    position:relative; padding:24px;
    background:var(--panel); border:1px solid var(--line); border-radius:var(--radius-card);
    backdrop-filter:blur(12px); -webkit-backdrop-filter:blur(12px);
    box-shadow:var(--shadow-card);
    transition:transform .2s ease, border-color .25s ease, box-shadow .25s ease;
  }
  .tier-card:hover{ transform:translateY(-2px); border-color:var(--line-strong); }
  .tier-card.is-featured{ border-color:rgba(61,123,255,.55); box-shadow:var(--shadow-glow); }
  .tier-top{ display:flex; align-items:flex-start; justify-content:space-between; gap:12px; }
  .tier-num{
    font-size:42px; font-weight:800; line-height:1; font-variant-numeric:tabular-nums;
    color:transparent; -webkit-text-stroke:1.4px rgba(126,168,255,.55);
  }
  .tier-card h3{ font-size:20px; font-weight:600; margin-top:16px; }
  .tier-for{ margin-top:8px; font-size:14px; color:var(--ink-3); }
  .tier-list{ margin-top:18px; padding-top:16px; border-top:1px solid var(--line); display:grid; gap:10px; }
  .tier-list li{ position:relative; padding-left:18px; font-size:14.5px; color:var(--ink-2); }
  .tier-list li::before{
    content:""; position:absolute; left:0; top:.62em; width:7px; height:7px; border-radius:50%;
    background:var(--accent); box-shadow:0 0 10px rgba(31,224,176,.7);
  }

  /* ---------- flow ---------- */
  .flow{ display:grid; grid-template-columns:1fr; gap:18px; counter-reset:step; }
  @media (min-width:768px){ .flow{ grid-template-columns:repeat(2,1fr); } }
  @media (min-width:1024px){ .flow{ grid-template-columns:repeat(4,1fr); gap:20px; } }
  .flow li{
    position:relative; padding:22px 20px; border-radius:14px;
    background:var(--panel-soft); border:1px solid var(--line);
    transition:border-color .22s ease, transform .22s ease;
  }
  .flow li:hover{ border-color:var(--line-strong); transform:translateY(-2px); }
  .flow-idx{
    display:inline-block; font-size:13px; font-weight:700; color:var(--accent);
    padding:3px 10px; border-radius:999px; background:rgba(31,224,176,.12);
    font-variant-numeric:tabular-nums;
  }
  .flow li h3{ font-size:17px; font-weight:600; margin-top:14px; }
  .flow li p{ margin-top:8px; font-size:14px; color:var(--ink-2); }

  /* ---------- rules split ---------- */
  .split{ display:grid; grid-template-columns:1fr; gap:26px; align-items:center; }
  @media (min-width:1024px){ .split{ grid-template-columns:.85fr 1.15fr; gap:44px; } }
  .split-media img{
    width:100%; aspect-ratio:4/3; object-fit:cover; border-radius:var(--radius-card);
    border:1px solid var(--line); box-shadow:var(--shadow-card); transition:transform .2s ease;
  }
  .split-media img:hover{ transform:scale(1.03); }
  .rule-list{ display:grid; gap:16px; margin-top:8px; }
  .rule-list li{
    padding:18px 20px; border-radius:14px; background:var(--panel-soft);
    border:1px solid var(--line); border-left:3px solid rgba(61,123,255,.65);
  }
  .rule-list h3{ font-size:16.5px; font-weight:600; }
  .rule-list p{ margin-top:6px; font-size:14.5px; color:var(--ink-2); }

  /* ---------- faq ---------- */
  .faq-wrap{
    background:var(--panel); border:1px solid var(--line); border-radius:var(--radius-card);
    backdrop-filter:blur(12px); -webkit-backdrop-filter:blur(12px); box-shadow:var(--shadow-card);
    padding:8px 20px;
  }
  .faq-item{ border-bottom:1px solid var(--line); }
  .faq-item:last-child{ border-bottom:none; }
  .faq-item summary{
    display:flex; align-items:center; justify-content:space-between; gap:16px;
    min-height:60px; padding:16px 0; cursor:pointer; list-style:none;
    font-size:16px; font-weight:600; color:var(--ink);
  }
  .faq-item summary::-webkit-details-marker{ display:none; }
  .faq-item summary::after{
    content:"+"; flex:0 0 auto; width:28px; height:28px; border-radius:50%;
    display:inline-flex; align-items:center; justify-content:center;
    font-size:18px; font-weight:500; color:var(--brand-300);
    background:rgba(61,123,255,.12); border:1px solid var(--line);
    transition:transform .3s ease, color .3s ease, border-color .3s ease;
  }
  .faq-item[open] summary::after{ content:"−"; color:var(--accent); border-color:rgba(31,224,176,.4); transform:rotate(180deg); }
  .faq-answer{ padding:0 0 20px; font-size:15px; color:var(--ink-2); max-width:900px; }
  .faq-item[open] .faq-answer{ animation:faqIn .3s ease; }
  @keyframes faqIn{ from{ opacity:0; transform:translateY(-4px); } to{ opacity:1; transform:none; } }

  /* ---------- cta ---------- */
  .cta-band{
    position:relative; overflow:hidden; border-radius:var(--radius-card);
    border:1px solid var(--line);
    background-image:linear-gradient(120deg, rgba(5,7,15,.92) 0%, rgba(10,16,32,.86) 55%, rgba(27,75,216,.55) 100%),
      url('/assets/images/backpic/back-2.webp');
    background-size:cover; background-position:center;
    padding:32px 24px;
  }
  @media (min-width:1024px){ .cta-band{ padding:44px 48px; } }
  .cta-band h2{ font-size:clamp(22px,3vw,30px); font-weight:600; }
  .cta-band p{ margin-top:12px; color:var(--ink-2); font-size:15.5px; max-width:680px; }
  .cta-tags{ display:flex; flex-wrap:wrap; gap:10px; margin-top:20px; }
  .cta-actions{ display:flex; flex-wrap:wrap; align-items:center; gap:12px; margin-top:24px; }
  .cta-note{ margin-top:16px; font-size:13px; color:var(--ink-3); }

  /* ---------- related categories ---------- */
  .cat-pills{ display:flex; flex-wrap:wrap; gap:12px; margin-top:22px; }
  .cat-pill{
    display:inline-flex; align-items:center; gap:8px; min-height:44px; padding:0 18px;
    border-radius:999px; font-size:14.5px; color:var(--ink-2);
    background:rgba(255,255,255,.04); border:1px solid var(--line);
    transition:border-color .2s ease, color .2s ease, background .2s ease, transform .2s ease;
  }
  .cat-pill:hover{ color:var(--ink); border-color:var(--line-strong); background:rgba(61,123,255,.12); transform:translateY(-1px); }
  .cat-pill.is-current{ color:var(--ink); border-color:rgba(31,224,176,.45); background:rgba(31,224,176,.1); cursor:default; }

  /* ---------- footer ---------- */
  .site-footer{
    margin-top:var(--sec-y); padding:48px 0 26px;
    background:rgba(5,7,15,.86); border-top:1px solid var(--line);
    backdrop-filter:blur(12px);
  }
  .foot-grid{ display:grid; grid-template-columns:1fr; gap:30px; }
  @media (min-width:768px){ .foot-grid{ grid-template-columns:1.4fr 1fr 1fr; gap:32px; } }
  @media (min-width:1024px){ .foot-grid{ grid-template-columns:1.5fr 1fr 1fr 1.2fr; } }
  .foot-title{ font-size:14px; font-weight:600; color:var(--ink); margin-bottom:14px; }
  .foot-link{ display:block; font-size:14px; color:var(--ink-3); padding:6px 0; transition:color .2s ease; }
  .foot-link:hover{ color:var(--accent); }
  .foot-sub{ display:flex; gap:10px; margin-top:12px; }
  .input{
    width:100%; min-height:44px; padding:0 14px; border-radius:var(--radius-btn);
    background:rgba(255,255,255,.04); border:1px solid var(--line); color:var(--ink);
    transition:border-color .2s ease, box-shadow .2s ease, background .2s ease;
  }
  .input::placeholder{ color:var(--ink-3); }
  .input:focus{ outline:none; border-color:var(--accent); box-shadow:0 0 0 3px rgba(31,224,176,.18); background:rgba(255,255,255,.06); }
  .foot-bottom{
    margin-top:34px; padding-top:18px; border-top:1px solid var(--line);
    display:flex; flex-wrap:wrap; gap:10px; justify-content:space-between;
    font-size:13px; color:var(--ink-3);
  }

  /* ---------- reveal ---------- */
  .js-on .reveal{ opacity:0; transform:translateY(14px); transition:opacity .6s ease, transform .6s ease; }
  .js-on .reveal.is-in{ opacity:1; transform:none; }
  @media (prefers-reduced-motion: reduce){
    html{ scroll-behavior:auto; }
    .js-on .reveal{ opacity:1; transform:none; transition:none; }
    .is-breathe{ animation:none; }
    *{ transition-duration:.01ms !important; animation-duration:.01ms !important; }
  }

/* roulang page: category4 */
:root{
  --bg-0:#05070F;
  --bg-1:#0A1020;
  --panel:rgba(18,26,44,.62);
  --panel-solid:#0E1526;
  --brand-500:#3D7BFF;
  --brand-700:#1B4BD8;
  --brand-300:#7EA8FF;
  --accent:#1FE0B0;
  --warn:#FF9A2E;
  --text:#E8EEFA;
  --text-2:#A7B4CC;
  --text-3:#6B7A99;
  --line:rgba(120,160,255,.14);
  --card-radius:16px;
  --btn-radius:12px;
  --shadow-card:0 10px 30px rgba(0,0,0,.35);
  --glow:0 0 0 1px rgba(61,123,255,.35), 0 8px 30px rgba(31,90,255,.28);
  --container:1200px;
}

*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  margin:0;
  background:var(--bg-0);
  color:var(--text);
  font-family:-apple-system,"PingFang SC","Microsoft YaHei","Noto Sans SC",sans-serif;
  font-size:16px;
  line-height:1.75;
  letter-spacing:0;
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block;border-radius:var(--card-radius)}
a{color:inherit;text-decoration:none}
button{font-family:inherit}
h1,h2,h3,h4,p,dl,dd,ul,ol{margin:0}
ul,ol{padding:0;list-style:none}
.num{font-variant-numeric:tabular-nums}

.container-x{
  width:100%;
  max-width:var(--container);
  margin:0 auto;
  padding-left:16px;
  padding-right:16px;
}
@media (min-width:768px){ .container-x{padding-left:24px;padding-right:24px} }
@media (min-width:1024px){ .container-x{padding-left:32px;padding-right:32px} }

/* ---------- 导航 ---------- */
.site-header{
  position:sticky;
  top:0;
  z-index:80;
  background:rgba(7,12,24,.7);
  backdrop-filter:blur(20px);
  -webkit-backdrop-filter:blur(20px);
  border-bottom:1px solid var(--line);
  transition:background .25s ease, box-shadow .25s ease;
}
.site-header.is-scrolled{
  background:rgba(5,8,16,.94);
  box-shadow:0 8px 26px rgba(0,0,0,.45);
}
.header-inner{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:20px;
  min-height:64px;
}
.logo{
  display:inline-flex;
  align-items:center;
  gap:10px;
  flex-shrink:0;
}
.logo-text{
  font-size:17px;
  font-weight:700;
  color:var(--text);
  letter-spacing:0;
  white-space:nowrap;
}
.nav-links{
  display:none;
  align-items:center;
  gap:4px;
}
@media (min-width:1024px){ .nav-links{display:flex} }
.nav-link{
  position:relative;
  display:inline-block;
  padding:9px 12px;
  font-size:14.5px;
  color:var(--text-2);
  border-radius:10px;
  transition:color .2s ease, background .2s ease;
}
.nav-link:hover{color:var(--text);background:rgba(61,123,255,.1)}
.nav-link.is-active{color:var(--text)}
.nav-link.is-active::after{
  content:"";
  position:absolute;
  left:12px;right:12px;bottom:2px;
  height:2px;border-radius:2px;
  background:linear-gradient(90deg,var(--brand-500),var(--accent));
  box-shadow:0 0 12px rgba(61,123,255,.85);
}
.header-actions{display:flex;align-items:center;gap:10px}
.login-link{
  display:none;
  font-size:14.5px;
  color:var(--text-2);
  padding:8px 6px;
  transition:color .2s ease;
}
.login-link:hover{color:var(--accent)}
@media (min-width:1024px){ .login-link{display:inline-block} }

.nav-toggle{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  width:44px;height:44px;
  border:1px solid var(--line);
  border-radius:12px;
  background:rgba(255,255,255,.04);
  color:var(--text);
  cursor:pointer;
}
.nav-toggle:hover{border-color:rgba(61,123,255,.55)}
@media (min-width:1024px){ .nav-toggle{display:none} }

.mobile-drawer{
  display:none;
  border-top:1px solid var(--line);
  background:rgba(5,8,16,.98);
  backdrop-filter:blur(18px);
  padding:18px 16px 24px;
}
.mobile-drawer.is-open{display:block}
.drawer-group-title{
  font-size:12.5px;
  color:var(--text-3);
  letter-spacing:0;
  margin:14px 0 6px;
}
.drawer-link{
  display:block;
  padding:12px 14px;
  border-radius:12px;
  color:var(--text-2);
  font-size:15px;
  border:1px solid transparent;
}
.drawer-link:hover{background:rgba(61,123,255,.1);color:var(--text)}
.drawer-link.is-active{
  color:var(--text);
  border-color:rgba(61,123,255,.5);
  background:rgba(61,123,255,.12);
}
.drawer-cta{margin-top:18px}
@media (min-width:1024px){ .mobile-drawer{display:none !important} }

/* ---------- 按钮 ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  min-height:44px;
  padding:11px 20px;
  border-radius:var(--btn-radius);
  border:1px solid transparent;
  font-size:15px;
  font-weight:600;
  cursor:pointer;
  transition:transform .18s ease, box-shadow .2s ease, border-color .2s ease, background .2s ease, color .2s ease;
}
.btn-primary{
  background:linear-gradient(135deg,#3D7BFF,#1B4BD8);
  color:#fff;
  box-shadow:var(--glow);
}
.btn-primary:hover{
  transform:translateY(-1px);
  box-shadow:0 0 0 1px rgba(61,123,255,.5), 0 12px 36px rgba(31,90,255,.4);
}
.btn-primary:active{transform:translateY(1px)}
.btn-secondary{
  background:rgba(255,255,255,.05);
  border-color:var(--line);
  color:var(--text);
  backdrop-filter:blur(10px);
}
.btn-secondary:hover{border-color:rgba(61,123,255,.65);color:#fff}
.btn-ghost{
  background:transparent;
  color:var(--accent);
  padding:11px 6px;
}
.btn-ghost:hover{color:#7ff2d6}
.btn-sm{min-height:40px;padding:9px 16px;font-size:14px}
.btn:focus-visible,
.nav-link:focus-visible,
.drawer-link:focus-visible,
.toc a:focus-visible,
input:focus-visible,
.faq-q:focus-visible{
  outline:2px solid var(--accent);
  outline-offset:2px;
}
.btn-breathe{animation:breathe 3.6s ease-in-out infinite}
@keyframes breathe{
  0%,100%{box-shadow:0 0 0 1px rgba(61,123,255,.35), 0 8px 26px rgba(31,90,255,.24)}
  50%{box-shadow:0 0 0 1px rgba(61,123,255,.5), 0 12px 36px rgba(31,90,255,.42)}
}

/* ---------- 徽章 / 标签 ---------- */
.badge{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:5px 12px;
  border-radius:999px;
  font-size:12.5px;
  font-weight:600;
  line-height:1.5;
}
.badge-accent{background:rgba(31,224,176,.14);color:var(--accent);border:1px solid rgba(31,224,176,.3)}
.badge-info{background:rgba(61,123,255,.12);color:var(--brand-300);border:1px solid rgba(61,123,255,.24)}
.badge-member{
  background:linear-gradient(135deg,rgba(61,123,255,.18),rgba(31,224,176,.14));
  color:#DDEBFF;
  border:1px solid rgba(126,168,255,.42);
}
.chip-row{display:flex;flex-wrap:wrap;gap:10px}
.chip{
  display:inline-flex;
  align-items:center;
  gap:8px;
  padding:10px 16px;
  border-radius:999px;
  border:1px solid var(--line);
  background:rgba(255,255,255,.04);
  color:var(--text-2);
  font-size:14px;
  transition:border-color .2s ease, color .2s ease, transform .2s ease;
}
.chip:hover{border-color:rgba(61,123,255,.6);color:var(--text);transform:translateY(-1px)}

/* ---------- 通用卡片 ---------- */
.glass-card{
  background:var(--panel);
  backdrop-filter:blur(14px);
  -webkit-backdrop-filter:blur(14px);
  border:1px solid var(--line);
  border-radius:var(--card-radius);
  box-shadow:var(--shadow-card);
}

/* ---------- Hero ---------- */
.hero-c4{
  position:relative;
  overflow:hidden;
  border-bottom:1px solid var(--line);
}
.hero-c4-bg{
  position:absolute;
  inset:0;
  background-image:url('/assets/images/backpic/back-2.webp');
  background-size:cover;
  background-position:center;
  opacity:.34;
}
.hero-c4-grid{
  position:absolute;
  inset:0;
  background-image:
    linear-gradient(rgba(120,160,255,.08) 1px,transparent 1px),
    linear-gradient(90deg,rgba(120,160,255,.08) 1px,transparent 1px);
  background-size:56px 56px;
  -webkit-mask-image:linear-gradient(180deg,rgba(0,0,0,.85),transparent 85%);
  mask-image:linear-gradient(180deg,rgba(0,0,0,.85),transparent 85%);
}
.hero-c4-shade{
  position:absolute;
  inset:0;
  background:linear-gradient(180deg,rgba(5,7,15,.74),rgba(5,7,15,.95));
}
.hero-c4-inner{
  position:relative;
  z-index:2;
  display:grid;
  grid-template-columns:1fr;
  gap:32px;
  align-items:center;
  padding-top:48px;
  padding-bottom:48px;
}
@media (min-width:1024px){
  .hero-c4-inner{grid-template-columns:1.1fr .9fr;gap:44px;padding-top:64px;padding-bottom:64px}
}
.hero-c4 h1{
  font-size:clamp(28px,5vw,42px);
  font-weight:700;
  line-height:1.25;
  margin:16px 0 14px;
}
.hero-c4-sub{
  font-size:16px;
  color:var(--text-2);
  max-width:560px;
}
.hero-cta{display:flex;flex-wrap:wrap;gap:12px;margin-top:26px}
.hero-meta{
  display:flex;
  flex-wrap:wrap;
  gap:22px;
  margin-top:28px;
  padding-top:20px;
  border-top:1px solid var(--line);
}
.hero-meta li{font-size:13.5px;color:var(--text-3)}
.hero-meta strong{display:block;font-size:17px;color:var(--text);font-weight:700}
.hero-visual{position:relative}
.hero-visual img{
  width:100%;
  aspect-ratio:16/11;
  object-fit:cover;
  border:1px solid var(--line);
}
.hero-visual-card{
  margin-top:-38px;
  margin-left:18px;
  margin-right:18px;
  position:relative;
  padding:16px 18px;
}
.hero-visual-card p{font-size:13.5px;color:var(--text-2)}
.hero-visual-card span{font-size:13px;color:var(--accent);font-weight:600}

/* ---------- 板块基础 ---------- */
.section{padding-top:56px;padding-bottom:56px}
@media (min-width:768px){ .section{padding-top:72px;padding-bottom:72px} }
@media (min-width:1024px){ .section{padding-top:96px;padding-bottom:96px} }
.section-head{max-width:720px;margin-bottom:28px}
.section-head h2{
  font-size:28px;
  font-weight:600;
  line-height:1.35;
  margin-bottom:10px;
}
@media (min-width:768px){ .section-head h2{font-size:31px} }
.section-head p{color:var(--text-2);font-size:15.5px}

/* ---------- 概览卡 ---------- */
.overview-grid{
  display:grid;
  grid-template-columns:1fr;
  gap:20px;
}
@media (min-width:1024px){
  .overview-grid{grid-template-columns:1.25fr .75fr;gap:24px}
}
.overview-main{padding:26px 24px}
.overview-main h3{font-size:21px;font-weight:600;margin-bottom:10px}
.overview-main p{color:var(--text-2);font-size:15.5px}
.overview-main ul{margin-top:18px;display:grid;gap:10px}
.overview-main li{
  display:flex;
  gap:10px;
  font-size:14.5px;
  color:var(--text-2);
}
.overview-main li::before{
  content:"";
  flex:0 0 auto;
  width:7px;height:7px;
  margin-top:8px;
  border-radius:50%;
  background:var(--accent);
  box-shadow:0 0 10px rgba(31,224,176,.7);
}
.overview-side{display:grid;gap:20px}
.mini-card{padding:20px 22px}
.mini-card h3{font-size:17px;font-weight:600;margin-bottom:8px}
.mini-card p{font-size:14.5px;color:var(--text-2)}

/* ---------- 主区：目录 + 说明 ---------- */
.doc-layout{
  display:grid;
  grid-template-columns:1fr;
  gap:28px;
}
@media (min-width:1024px){
  .doc-layout{grid-template-columns:260px 1fr;gap:40px;align-items:start}
}
.toc{
  padding:18px;
}
@media (min-width:1024px){
  .toc{position:sticky;top:88px}
}
.toc-title{
  font-size:13px;
  color:var(--text-3);
  margin-bottom:10px;
}
.toc a{
  display:block;
  padding:10px 14px;
  border-radius:12px;
  border-left:2px solid transparent;
  color:var(--text-2);
  font-size:14.5px;
  transition:background .2s ease,color .2s ease,border-color .2s ease;
}
.toc a:hover{color:var(--text);background:rgba(61,123,255,.1)}
.toc a.is-current{
  color:var(--text);
  background:rgba(61,123,255,.12);
  border-left-color:var(--brand-500);
}
.toc-note{
  margin-top:16px;
  padding-top:14px;
  border-top:1px solid var(--line);
  font-size:13px;
  color:var(--text-3);
}

.rule-group{padding:24px 22px;margin-bottom:20px}
@media (min-width:768px){ .rule-group{padding:28px 28px} }
.rule-head{display:flex;gap:16px;align-items:flex-start}
.rule-num{
  flex:0 0 auto;
  font-size:22px;
  font-weight:700;
  color:var(--brand-300);
  line-height:1.2;
  letter-spacing:0;
}
.rule-head h3{font-size:20px;font-weight:600;margin-bottom:6px}
.rule-head p{font-size:14.5px;color:var(--text-2)}
.rule-dl{margin-top:20px}
.rule-row{
  border-top:1px solid var(--line);
  padding:16px 0;
  display:grid;
  grid-template-columns:1fr;
  gap:8px;
}
@media (min-width:768px){
  .rule-row{grid-template-columns:220px 1fr;gap:20px;align-items:start}
}
.rule-row dt{
  font-size:15.5px;
  font-weight:600;
  color:var(--text);
}
.rule-row dd{
  font-size:14.8px;
  color:var(--text-2);
  line-height:1.8;
}

/* ---------- 时效流程 ---------- */
.steps{
  display:grid;
  grid-template-columns:1fr;
  gap:20px;
}
@media (min-width:640px){ .steps{grid-template-columns:repeat(2,1fr)} }
@media (min-width:1024px){ .steps{grid-template-columns:repeat(4,1fr)} }
.step{padding:22px 20px;position:relative}
.step-idx{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  width:34px;height:34px;
  border-radius:999px;
  border:1px solid rgba(61,123,255,.45);
  color:var(--brand-300);
  font-size:14px;
  font-weight:700;
  margin-bottom:14px;
}
.step h3{font-size:17px;font-weight:600;margin-bottom:8px}
.step p{font-size:14.4px;color:var(--text-2)}

/* ---------- FAQ ---------- */
.faq-item{margin-bottom:12px;overflow:hidden}
.faq-q{
  width:100%;
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:16px;
  padding:18px 20px;
  background:none;
  border:0;
  color:var(--text);
  font-size:16px;
  font-weight:600;
  text-align:left;
  cursor:pointer;
}
.faq-sign{
  flex:0 0 auto;
  width:26px;height:26px;
  display:inline-flex;
  align-items:center;
  justify-content:center;
  border-radius:999px;
  border:1px solid var(--line);
  color:var(--brand-300);
  font-size:15px;
  transition:transform .3s ease, color .2s ease, border-color .2s ease;
}
.faq-item.is-open .faq-sign{
  transform:rotate(45deg);
  color:var(--accent);
  border-color:rgba(31,224,176,.5);
}
.faq-a{
  max-height:0;
  overflow:hidden;
  transition:max-height .3s ease;
}
.faq-a-inner{
  padding:0 20px 20px;
  font-size:15px;
  color:var(--text-2);
  line-height:1.85;
}

/* ---------- 表单 ---------- */
.form-grid{
  display:grid;
  grid-template-columns:1fr;
  gap:16px;
}
@media (min-width:768px){
  .form-grid{grid-template-columns:1fr 1fr}
  .form-grid .full{grid-column:1 / -1}
}
.field label{
  display:block;
  font-size:13.5px;
  color:var(--text-2);
  margin-bottom:8px;
}
.input{
  width:100%;
  min-height:46px;
  padding:12px 14px;
  background:rgba(255,255,255,.04);
  border:1px solid var(--line);
  border-radius:12px;
  color:var(--text);
  font-size:15px;
  transition:border-color .2s ease, box-shadow .2s ease;
  -webkit-appearance:none;
  appearance:none;
}
.input::placeholder{color:var(--text-3)}
.input:focus{
  outline:none;
  border-color:rgba(31,224,176,.65);
  box-shadow:0 0 0 3px rgba(31,224,176,.16);
}
textarea.input{min-height:120px;resize:vertical;line-height:1.7}
.form-note{
  font-size:13px;
  color:var(--text-3);
  margin-top:14px;
}
.form-msg{
  display:none;
  margin-top:14px;
  font-size:13.5px;
  color:var(--accent);
}
.form-msg.is-show{display:block}

/* ---------- CTA ---------- */
.cta-bar{
  position:relative;
  overflow:hidden;
  border-radius:20px;
  border:1px solid var(--line);
}
.cta-bg{
  position:absolute;
  inset:0;
  background-image:url('/assets/images/backpic/back-3.png');
  background-size:cover;
  background-position:center;
  opacity:.26;
}
.cta-inner{
  position:relative;
  padding:34px 24px;
  background:linear-gradient(90deg,rgba(5,7,15,.94),rgba(5,7,15,.68));
  display:grid;
  gap:22px;
}
@media (min-width:1024px){
  .cta-inner{grid-template-columns:1.2fr .8fr;align-items:center;padding:44px 40px}
}
.cta-inner h2{font-size:26px;font-weight:600;margin-bottom:10px}
.cta-inner p{font-size:15px;color:var(--text-2)}
.cta-actions{display:flex;flex-wrap:wrap;gap:14px;align-items:center}
.cta-tags{display:flex;flex-wrap:wrap;gap:10px;margin-top:16px}

/* ---------- 页脚 ---------- */
.site-footer{
  border-top:1px solid var(--line);
  background:#070C18;
  padding:56px 0 24px;
  margin-top:0;
}
.foot-grid{
  display:grid;
  grid-template-columns:1fr;
  gap:32px;
}
@media (min-width:768px){ .foot-grid{grid-template-columns:1fr 1fr} }
@media (min-width:1024px){ .foot-grid{grid-template-columns:1.4fr 1fr 1fr 1.2fr;gap:36px} }
.foot-title{
  font-size:14px;
  font-weight:600;
  color:var(--text);
  margin-bottom:14px;
}
.foot-link{
  display:block;
  font-size:14px;
  color:var(--text-3);
  padding:6px 0;
  transition:color .2s ease, transform .2s ease;
}
.foot-link:hover{color:var(--accent);transform:translateX(2px)}
.foot-sub{display:flex;gap:8px;margin-top:12px;flex-wrap:wrap}
.foot-sub .input{flex:1 1 150px;min-width:0}
.foot-bottom{
  display:flex;
  flex-wrap:wrap;
  gap:10px;
  justify-content:space-between;
  align-items:center;
  margin-top:38px;
  padding-top:20px;
  border-top:1px solid var(--line);
  font-size:13px;
  color:var(--text-3);
}

/* ---------- 动效 ---------- */
.fade-up{
  opacity:0;
  transform:translateY(14px);
  transition:opacity .6s ease, transform .6s ease;
}
.fade-up.is-in{opacity:1;transform:none}
@media (prefers-reduced-motion: reduce){
  html{scroll-behavior:auto}
  .fade-up{opacity:1;transform:none;transition:none}
  .btn-breathe{animation:none}
  .btn{transition:none}
}