/* ==========================================================================
   355娱乐 · 中国官网 — 共享样式表 /assets/site.css
   夜间娱乐 · 赛博导航 · 印刷档案
   ========================================================================== */

/* 1. Reset ---------------------------------------------------------------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;scroll-padding-top:120px}
body{margin:0;min-height:100vh}
img,picture,video,canvas,svg{display:block;max-width:100%;height:auto}
button,input,select,textarea{font:inherit;color:inherit}
ul,ol{margin:0;padding:0;list-style:none}
h1,h2,h3,h4,h5,h6,p,figure,blockquote{margin:0}
a{color:inherit;text-decoration:none}
table{border-collapse:collapse;width:100%}

/* 2. 设计变量 -------------------------------------------------------------- */
:root{
  --ink-000:#05060A;
  --ink-050:#080A10;
  --ink-100:#0F1219;
  --ink-200:#1B1F2B;
  --violet:#8B5CF6;
  --violet-deep:#6D3BE0;
  --violet-soft:#C4B5FD;
  --blue:#38BDF8;
  --pink:#FF4D9D;
  --gold:#F2C879;
  --gold-deep:#4A3A22;
  --white:#F4F5F9;
  --mist:#9BA1B4;
  --green:#3DDC97;

  --bg:var(--ink-000);
  --bg-card:var(--ink-100);
  --line:rgba(139,92,246,.30);
  --line-soft:rgba(155,161,180,.18);
  --text:var(--white);
  --text-dim:var(--mist);

  --font-sans:"Source Han Sans SC","Noto Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",sans-serif;
  --font-mono:"JetBrains Mono","SFMono-Regular",ui-monospace,Menlo,Consolas,"Courier New",monospace;

  --wrap:1240px;
  --gutter:clamp(16px,4vw,40px);
  --radius-sm:10px;
  --radius:16px;
  --radius-lg:26px;
  --radius-pill:999px;

  --glow-violet:0 20px 46px -28px rgba(139,92,246,.95),inset 0 1px 0 rgba(196,181,253,.12);
  --paper:0 1px 0 rgba(244,245,249,.05),0 22px 46px -34px rgba(0,0,0,.95);
}

/* 3. 中文排版 -------------------------------------------------------------- */
body{
  font-family:var(--font-sans);
  font-size:clamp(15px,1.02vw,17px);
  line-height:1.9;
  letter-spacing:.01em;
  color:var(--text);
  background-color:var(--ink-000);
  background-image:
    radial-gradient(1100px 560px at 10% -10%,rgba(139,92,246,.17),transparent 62%),
    radial-gradient(900px 520px at 95% 2%,rgba(56,189,248,.12),transparent 66%),
    radial-gradient(760px 440px at 58% 104%,rgba(255,77,157,.08),transparent 72%);
}
h1{font-size:clamp(34px,5.4vw,62px);font-weight:900;line-height:1.12;letter-spacing:-.03em;margin-bottom:.5em;color:var(--white)}
h2{font-size:clamp(25px,3.2vw,38px);font-weight:900;line-height:1.2;letter-spacing:-.02em;margin-bottom:.55em;color:var(--white)}
h3{font-size:clamp(19px,1.9vw,25px);font-weight:800;line-height:1.32;letter-spacing:-.01em;margin-bottom:.55em;color:var(--white)}
h4{font-size:clamp(16px,1.4vw,19px);font-weight:800;margin-bottom:.5em;color:var(--white)}
p{margin-bottom:1.1em}
strong{font-weight:800;color:var(--white)}
a{color:var(--blue);transition:color .22s ease}
a:hover{color:var(--violet-soft)}
.mono{font-family:var(--font-mono);letter-spacing:.02em}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0}

:focus-visible{outline:2px solid var(--blue);outline-offset:3px;border-radius:8px}
::selection{background:rgba(139,92,246,.45);color:#fff}

/* 4. 跳过链接与主区 -------------------------------------------------------- */
.skip-link{
  position:fixed;top:10px;left:50%;z-index:200;
  transform:translate(-50%,-180%);
  pointer-events:auto;
  padding:11px 20px;border-radius:var(--radius-pill);
  background:linear-gradient(120deg,var(--violet),var(--violet-deep));
  color:#fff;font-weight:800;font-size:14px;
  box-shadow:0 18px 40px -24px rgba(139,92,246,1);
  transition:transform .22s ease;
}
.skip-link:focus-visible{transform:translate(-50%,0);color:#fff}

main{display:block}
#main-content{padding-top:clamp(88px,10vw,112px)}

/* 5. 内容容器与章节骨架 ---------------------------------------------------- */
.wrap{width:min(var(--wrap),100%);margin:0 auto;padding:0 var(--gutter)}
.section{position:relative;padding:clamp(40px,6vw,86px) 0}
.section--tight{padding:clamp(22px,3.2vw,46px) 0}
.band{
  position:relative;padding:clamp(16px,2.4vw,28px) 0;
  background:linear-gradient(90deg,rgba(139,92,246,.18),rgba(56,189,248,.09) 58%,transparent);
  border-top:1px solid var(--line);border-bottom:1px solid var(--line);
}
.section-head{display:flex;flex-wrap:wrap;align-items:flex-end;gap:14px 22px;margin-bottom:clamp(18px,2.4vw,32px)}
.section-index{
  font-family:var(--font-mono);font-size:12.5px;letter-spacing:.2em;
  padding:5px 13px;border-radius:var(--radius-pill);
  color:var(--violet-soft);background:rgba(139,92,246,.12);border:1px solid rgba(139,92,246,.45);
}
.lede{font-size:clamp(16px,1.35vw,19px);line-height:1.85;color:#D6D9E4;max-width:64ch}
.divider{height:1px;border:0;margin:clamp(26px,4vw,54px) 0;background:linear-gradient(90deg,transparent,rgba(139,92,246,.55),rgba(56,189,248,.4),transparent)}

/* 6. 页头：悬浮胶囊浮岛 ---------------------------------------------------- */
.site-header{
  position:fixed;inset:0 0 auto 0;z-index:90;
  padding:14px var(--gutter) 0;
  pointer-events:none;
  transition:padding .35s ease;
}
.site-header[data-condensed="true"]{padding-top:8px}

.scroll-progress{
  position:absolute;left:0;top:0;height:2px;width:0;
  background:linear-gradient(90deg,var(--violet),var(--blue) 55%,var(--pink));
  box-shadow:0 0 14px rgba(139,92,246,.85);
}

.header-inner{
  position:relative;
  pointer-events:auto;
  width:min(var(--wrap),100%);margin:0 auto;
  display:flex;align-items:center;gap:clamp(8px,1.5vw,20px);
  padding:9px 12px 9px 16px;
  border-radius:var(--radius-pill);
  background:linear-gradient(120deg,rgba(15,18,25,.95),rgba(8,10,16,.88));
  border:1px solid var(--line);
  box-shadow:var(--glow-violet);
  backdrop-filter:blur(16px) saturate(140%);
  -webkit-backdrop-filter:blur(16px) saturate(140%);
  transition:padding .35s ease,background .35s ease,box-shadow .35s ease;
}
.site-header[data-condensed="true"] .header-inner{
  padding:5px 10px 5px 14px;
  background:linear-gradient(120deg,rgba(11,13,20,.97),rgba(6,7,12,.94));
  box-shadow:0 14px 34px -24px rgba(139,92,246,.95),inset 0 1px 0 rgba(196,181,253,.1);
}

.brand{display:flex;align-items:center;gap:12px;flex:0 0 auto;color:var(--white)}
.brand:hover{color:var(--white)}
.brand-mark{
  display:grid;place-items:center;flex:0 0 auto;
  width:46px;height:38px;border-radius:12px;
  font-family:var(--font-mono);font-size:15px;font-weight:700;letter-spacing:.06em;color:#fff;
  background:linear-gradient(150deg,var(--violet),#5B21B6);
  box-shadow:0 0 0 1px rgba(196,181,253,.35),4px 4px 0 0 rgba(56,189,248,.34);
  transition:transform .25s ease,box-shadow .25s ease;
}
.brand:hover .brand-mark{transform:translate(-1px,-1px);box-shadow:0 0 0 1px rgba(196,181,253,.55),6px 6px 0 0 rgba(56,189,248,.45)}
.brand-mark--lg{width:56px;height:46px;border-radius:14px;font-size:17px}
.brand-text{display:flex;flex-direction:column;line-height:1.24}
.brand-name{font-weight:900;font-size:17px;letter-spacing:-.01em;white-space:nowrap}
.brand-tagline{font-family:var(--font-mono);font-size:10.5px;letter-spacing:.12em;color:var(--mist);white-space:nowrap}

/* 7. 导航 ------------------------------------------------------------------ */
.site-nav{display:flex;align-items:center;gap:10px;margin-left:auto}
.nav-list{display:flex;align-items:center;gap:3px}
.nav-list a{
  display:block;padding:8px 12px;border-radius:var(--radius-pill);
  font-size:14.5px;font-weight:700;color:var(--mist);white-space:nowrap;
  transition:color .2s ease,background .2s ease,box-shadow .25s ease;
}
.nav-list a:hover{color:var(--white);background:rgba(56,189,248,.12)}
.nav-list a[aria-current="page"]{
  color:#fff;
  background:linear-gradient(120deg,var(--violet),var(--violet-deep));
  box-shadow:0 0 0 1px rgba(196,181,253,.4),0 12px 26px -18px rgba(139,92,246,1);
}

.nav-quick{display:none;align-items:center;gap:8px}
@media (min-width:1080px){.nav-quick{display:flex}}
.quick-chip{
  font-family:var(--font-mono);font-size:12.5px;letter-spacing:.05em;
  padding:8px 14px;border-radius:var(--radius-pill);white-space:nowrap;
  color:var(--blue);background:rgba(56,189,248,.09);border:1px solid rgba(56,189,248,.42);
  transition:color .2s ease,background .2s ease,border-color .2s ease;
}
.quick-chip:hover{color:#fff;background:rgba(56,189,248,.2);border-color:var(--blue)}
.quick-chip--hot{color:var(--pink);background:rgba(255,77,157,.09);border-color:rgba(255,77,157,.45)}
.quick-chip--hot:hover{color:#fff;background:rgba(255,77,157,.2);border-color:var(--pink)}

.nav-toggle{
  display:inline-flex;align-items:center;gap:9px;flex:0 0 auto;
  padding:9px 16px;border-radius:var(--radius-pill);cursor:pointer;
  color:var(--white);font-weight:800;font-size:14px;
  background:rgba(139,92,246,.15);border:1px solid var(--line);
  transition:background .22s ease,border-color .22s ease;
}
.nav-toggle:hover{background:rgba(139,92,246,.28);border-color:rgba(196,181,253,.55)}
.nav-toggle-bars{display:inline-flex;flex-direction:column;gap:4px;width:16px}
.nav-toggle-bars span{display:block;height:2px;border-radius:2px;background:var(--violet-soft);transition:transform .25s ease,opacity .25s ease}
.nav-toggle-bars span:nth-child(2){width:70%}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars span:nth-child(1){transform:translateY(6px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars span:nth-child(2){opacity:0}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars span:nth-child(3){transform:translateY(-6px) rotate(-45deg)}
.nav-toggle-label{font-family:var(--font-mono);font-size:12.5px;letter-spacing:.08em}

/* 栏目浮岛 */
.nav-island{
  position:absolute;top:calc(100% + 14px);left:0;right:0;
  display:none;padding:clamp(16px,2vw,24px);
  border-radius:var(--radius-lg);
  background:linear-gradient(160deg,rgba(15,18,25,.985),rgba(6,7,12,.985));
  border:1px solid var(--line);
  box-shadow:0 44px 90px -54px rgba(139,92,246,.95),inset 0 1px 0 rgba(196,181,253,.1);
}
.site-nav[data-open="true"] .nav-island{display:block}
.island-title{
  display:flex;align-items:center;gap:12px;margin:0 0 14px;
  font-family:var(--font-mono);font-size:11.5px;letter-spacing:.2em;color:var(--violet-soft);
}
.island-title::after{content:"";flex:1;height:1px;background:linear-gradient(90deg,rgba(139,92,246,.55),transparent)}
.island-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:12px}
.island-col{padding:12px 13px;border-radius:var(--radius);background:rgba(27,31,43,.55);border:1px solid var(--line-soft)}
.island-col-title{
  display:flex;align-items:center;justify-content:space-between;gap:8px;margin:0 0 10px;
  font-size:14px;font-weight:800;color:var(--white);
}
.island-col-title span{font-family:var(--font-mono);font-size:11px;color:var(--mist);letter-spacing:.1em}
.island-list{display:flex;flex-direction:column;gap:6px}
.island-chip{
  display:flex;align-items:center;justify-content:space-between;gap:8px;
  padding:7px 10px;border-radius:10px;font-size:14px;font-weight:600;color:var(--white);
  background:rgba(5,6,10,.55);border:1px solid transparent;
  transition:border-color .2s ease,background .2s ease;
}
.island-chip:hover{color:#fff;background:rgba(56,189,248,.12);border-color:rgba(56,189,248,.55)}
.chip-name{white-space:nowrap}
.chip-tier{
  font-family:var(--font-mono);font-size:10.5px;letter-spacing:.04em;white-space:nowrap;
  padding:2px 7px;border-radius:var(--radius-pill);color:var(--gold);border:1px solid currentColor;
}
.island-foot{
  display:flex;flex-wrap:wrap;align-items:center;gap:10px;
  margin-top:16px;padding-top:14px;border-top:1px dashed rgba(155,161,180,.24);
}
.island-note{margin:0;font-family:var(--font-mono);font-size:11.5px;color:var(--mist)}

/* 8. 按钮 ------------------------------------------------------------------ */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:12px 22px;border-radius:var(--radius-pill);border:1px solid transparent;
  font-weight:800;font-size:15px;line-height:1;cursor:pointer;text-align:center;
  transition:transform .2s ease,box-shadow .25s ease,background .25s ease,color .25s ease,border-color .25s ease;
}
.btn--primary{color:#fff;background:linear-gradient(120deg,var(--violet),var(--violet-deep));box-shadow:var(--glow-violet)}
.btn--primary:hover{color:#fff;transform:translateY(-2px);box-shadow:0 24px 52px -24px rgba(139,92,246,1)}
.btn--gold{color:#20180A;background:linear-gradient(120deg,#F2C879,#C9922F);box-shadow:0 18px 42px -28px rgba(242,200,121,.95)}
.btn--gold:hover{color:#20180A;transform:translateY(-2px)}
.btn--ghost{color:var(--blue);background:rgba(56,189,248,.09);border-color:rgba(56,189,248,.42)}
.btn--ghost:hover{color:#fff;background:rgba(56,189,248,.2);border-color:var(--blue)}
.btn--line{color:var(--violet-soft);background:transparent;border-color:rgba(196,181,253,.38)}
.btn--line:hover{color:#fff;border-color:var(--violet-soft);background:rgba(139,92,246,.16)}
.btn--sm{padding:9px 16px;font-size:13.5px}
.btn--block{width:100%}

/* 9. 页脚：档案封底 -------------------------------------------------------- */
.site-footer{
  position:relative;margin-top:clamp(48px,8vw,110px);
  background:linear-gradient(180deg,rgba(15,18,25,.92),rgba(5,6,10,1) 46%),var(--ink-000);
  border-top:1px solid var(--line);
  color:var(--text-dim);
}
.site-footer::before{
  content:"";position:absolute;inset:0 0 auto 0;height:230px;pointer-events:none;
  background-image:
    linear-gradient(rgba(139,92,246,.10) 1px,transparent 1px),
    linear-gradient(90deg,rgba(139,92,246,.10) 1px,transparent 1px);
  background-size:44px 44px;
  -webkit-mask-image:linear-gradient(180deg,rgba(0,0,0,.8),transparent);
  mask-image:linear-gradient(180deg,rgba(0,0,0,.8),transparent);
}
.footer-band{
  display:block;height:3px;
  background:linear-gradient(90deg,var(--violet),var(--blue) 38%,var(--pink) 72%,var(--gold));
  box-shadow:0 0 20px rgba(139,92,246,.6);
}
.footer-inner{position:relative;width:min(var(--wrap),100%);margin:0 auto;padding:clamp(34px,5vw,64px) var(--gutter) 0}

.footer-lead{
  display:grid;grid-template-columns:minmax(0,1.05fr) minmax(0,1fr);
  gap:26px;padding-bottom:28px;border-bottom:1px solid var(--line-soft);
}
.footer-brand{display:flex;flex-direction:column;gap:10px}
.footer-logo{display:flex;align-items:center;gap:14px}
.footer-wordmark{font-weight:900;font-size:20px;letter-spacing:-.01em;color:var(--white)}
.footer-tagline{margin:0;font-family:var(--font-mono);font-size:11.5px;letter-spacing:.16em;color:var(--mist)}
.footer-note{margin:0;font-size:15px;color:#D6D9E4}
.footer-export{display:flex;flex-direction:column;align-items:flex-start;gap:12px}
.footer-hint{margin:0;font-size:13.5px;line-height:1.8;color:var(--mist);max-width:42ch}
.footer-support{
  font-family:var(--font-mono);font-size:12.5px;letter-spacing:.04em;color:var(--blue);
  padding-bottom:2px;border-bottom:1px dashed rgba(56,189,248,.5);
}
.footer-support:hover{color:#fff;border-bottom-color:var(--violet-soft)}

.footer-grid{
  display:grid;grid-template-columns:repeat(3,minmax(0,1fr)) minmax(0,1.5fr);
  gap:26px;padding:30px 0;border-bottom:1px solid var(--line-soft);
}
.footer-col-title{
  margin:0 0 12px;font-family:var(--font-mono);font-size:11.5px;letter-spacing:.18em;
  color:var(--violet-soft);text-transform:uppercase;
}
.footer-links{display:flex;flex-direction:column;gap:9px}
.footer-links a{font-size:14.5px;color:var(--mist)}
.footer-links a:hover{color:var(--white)}
.footer-contact p{margin:0 0 9px}
.contact-line{font-family:var(--font-mono);font-size:13px;color:var(--white);word-break:break-word}
.service-hours{font-size:13.5px;color:var(--mist);line-height:1.75}

.footer-legal{
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;
  gap:12px 22px;padding:22px 0 34px;
}
.footer-legal-line{margin:0;font-family:var(--font-mono);font-size:12.5px;color:var(--mist)}
.footer-legal-actions{display:flex;flex-wrap:wrap;align-items:center;gap:10px}
.legal-chip{
  font-family:var(--font-mono);font-size:11.5px;letter-spacing:.06em;
  padding:6px 12px;border-radius:var(--radius-pill);
  color:var(--gold);background:rgba(242,200,121,.09);border:1px solid rgba(242,200,121,.42);
}
.to-top{
  display:inline-flex;align-items:center;gap:8px;cursor:pointer;
  padding:9px 16px;border-radius:var(--radius-pill);
  font-family:var(--font-mono);font-size:12.5px;font-weight:700;letter-spacing:.05em;
  color:var(--violet-soft);background:rgba(139,92,246,.12);border:1px solid rgba(196,181,253,.32);
  transition:opacity .25s ease,background .25s ease,transform .25s ease,color .25s ease;
}
.to-top[data-visible="true"]{background:rgba(139,92,246,.24);box-shadow:0 16px 36px -26px rgba(139,92,246,1);color:#fff}
.to-top:hover{color:#fff;background:rgba(139,92,246,.36);transform:translateY(-2px)}

/* 10. 面包屑 --------------------------------------------------------------- */
.breadcrumb{width:min(var(--wrap),100%);margin:0 auto;padding:0 var(--gutter)}
.breadcrumb ol{display:flex;flex-wrap:wrap;gap:8px;font-family:var(--font-mono);font-size:12.5px;color:var(--mist)}
.breadcrumb li{display:flex;align-items:center;gap:8px}
.breadcrumb li+li::before{content:"/";color:rgba(155,161,180,.55)}
.breadcrumb a{color:var(--mist)}
.breadcrumb a:hover{color:var(--blue)}
.breadcrumb [aria-current="page"]{color:var(--violet-soft)}

/* 11. 卡片与标签 ----------------------------------------------------------- */
.grid{display:grid;gap:clamp(14px,1.8vw,22px)}
.grid--2{grid-template-columns:repeat(2,minmax(0,1fr))}
.grid--3{grid-template-columns:repeat(3,minmax(0,1fr))}
.grid--4{grid-template-columns:repeat(4,minmax(0,1fr))}
.grid--asym{grid-template-columns:minmax(0,1.35fr) minmax(0,1fr)}

.card{
  position:relative;padding:clamp(16px,2vw,24px);
  border-radius:var(--radius);border:1px solid var(--line-soft);
  background:linear-gradient(165deg,rgba(15,18,25,.96),rgba(8,10,16,.92));
  box-shadow:var(--paper);
  transition:border-color .25s ease,transform .25s ease,box-shadow .25s ease;
}
.card:hover{border-color:rgba(56,189,248,.5);transform:translateY(-3px);box-shadow:0 32px 64px -44px rgba(56,189,248,.95)}
.card--print{border-radius:var(--radius-sm);border-color:rgba(155,161,180,.3);background:linear-gradient(180deg,rgba(15,18,25,.98),rgba(11,13,20,.98))}
.card--print::after{content:"";position:absolute;inset:6px;border:1px dashed rgba(155,161,180,.2);border-radius:5px;pointer-events:none}
.card--accent{border-color:rgba(255,77,157,.42);box-shadow:0 24px 60px -46px rgba(255,77,157,.95)}
.card-title{margin:0 0 8px;font-size:clamp(17px,1.6vw,22px)}
.card-text{margin:0;font-size:15px;color:var(--mist)}

.tag{
  display:inline-flex;align-items:center;gap:6px;
  padding:4px 11px;border-radius:var(--radius-pill);
  font-family:var(--font-mono);font-size:11.5px;letter-spacing:.06em;
  color:var(--mist);border:1px solid rgba(155,161,180,.32);
}
.tag--violet{color:var(--violet-soft);border-color:rgba(139,92,246,.5);background:rgba(139,92,246,.12)}
.tag--blue{color:var(--blue);border-color:rgba(56,189,248,.5);background:rgba(56,189,248,.1)}
.tag--pink{color:var(--pink);border-color:rgba(255,77,157,.5);background:rgba(255,77,157,.1)}
.tag--gold{color:var(--gold);border-color:rgba(242,200,121,.5);background:rgba(242,200,121,.1)}
.tag--green{color:var(--green);border-color:rgba(61,220,151,.5);background:rgba(61,220,151,.1)}

/* 12. 数据组件 ------------------------------------------------------------- */
.stat{
  display:flex;flex-direction:column;gap:6px;padding:14px 16px;
  border-radius:var(--radius-sm);background:rgba(27,31,43,.5);border:1px solid var(--line-soft);
}
.stat-value{font-family:var(--font-mono);font-weight:700;line-height:1.1;font-size:clamp(22px,2.6vw,32px);color:var(--gold)}
.stat-label{font-size:13px;color:var(--mist)}
.ledger-scroll{overflow-x:auto;-webkit-overflow-scrolling:touch}
.ledger{min-width:520px;font-family:var(--font-mono);font-size:13.5px}
.ledger th{text-align:left;padding:10px 12px;font-weight:700;letter-spacing:.08em;color:var(--violet-soft);border-bottom:1px solid var(--line)}
.ledger td{padding:10px 12px;color:#D6D9E4;border-bottom:1px solid var(--line-soft)}
.ledger tbody tr:nth-child(even){background:rgba(74,58,34,.3)}
.ledger .is-key{color:var(--gold)}

/* 13. 正文与图片容器 ------------------------------------------------------- */
.prose{max-width:72ch}
.prose p{color:#D6D9E4}
.prose h2,.prose h3{margin-top:1.6em}
.prose ul,.prose ol{list-style:disc;padding-left:1.35em;color:#D6D9E4}
.prose ol{list-style:decimal}
.prose li{margin:.4em 0}

.figure{margin:0}
.figure-frame{
  position:relative;overflow:hidden;border-radius:var(--radius);
  border:1px solid var(--line-soft);
  background:linear-gradient(150deg,rgba(139,92,246,.22),rgba(56,189,248,.12) 55%,rgba(255,77,157,.16));
}
.figure-frame::before{
  content:"";position:absolute;inset:0;z-index:0;pointer-events:none;opacity:.55;
  background-image:
    linear-gradient(rgba(5,6,10,.6) 1px,transparent 1px),
    linear-gradient(90deg,rgba(5,6,10,.6) 1px,transparent 1px);
  background-size:32px 32px;
}
.figure-frame--glow{box-shadow:0 44px 96px -62px rgba(139,92,246,1)}
.figure-media{position:relative;z-index:1;display:block;width:100%;height:100%;object-fit:cover;aspect-ratio:16/9}
.figure-media--wide{aspect-ratio:21/9}
.figure-media--tall{aspect-ratio:3/4}
.figure-media--square{aspect-ratio:1/1}
.figure-media--slot{
  display:grid;place-items:center;
  color:var(--violet-soft);font-family:var(--font-mono);font-size:12px;letter-spacing:.1em;
}
.figure-cap{margin:10px 0 0;font-family:var(--font-mono);font-size:12px;color:var(--mist)}

/* 14. 章节目录（时间轴） --------------------------------------------------- */
.chapter-rail{display:none}
@media (min-width:1180px){
  .chapter-rail{
    display:block;position:fixed;z-index:70;width:132px;
    left:max(16px,calc((100vw - var(--wrap))/2 - 158px));
    top:50%;transform:translateY(-50%);
  }
}
.chapter-rail ol{position:relative;display:flex;flex-direction:column;gap:14px}
.chapter-rail ol::before{
  content:"";position:absolute;left:5px;top:6px;bottom:6px;width:1px;
  background:linear-gradient(180deg,rgba(139,92,246,.55),rgba(56,189,248,.35),transparent);
}
.chapter-rail a{
  display:flex;align-items:center;gap:10px;
  font-family:var(--font-mono);font-size:12px;color:var(--mist);padding:2px 0;
}
.chapter-rail a::before{
  content:"";flex:0 0 auto;width:11px;height:11px;border-radius:50%;
  background:var(--ink-000);border:1px solid rgba(139,92,246,.6);
  transition:background .25s ease,box-shadow .25s ease,transform .25s ease;
}
.chapter-rail a:hover{color:var(--blue)}
.chapter-rail a[aria-current="true"]{color:var(--white)}
.chapter-rail a[aria-current="true"]::before{
  background:var(--violet);
  box-shadow:0 0 0 4px rgba(139,92,246,.24),0 0 14px rgba(139,92,246,.9);
  transform:scale(1.06);
}

/* 15. 显现动效与降级 ------------------------------------------------------- */
[data-reveal]{opacity:0;transform:translateY(18px);transition:opacity .5s ease,transform .5s ease}
[data-reveal].is-visible{opacity:1;transform:none}

/* 16. 响应式 --------------------------------------------------------------- */
@media (max-width:1180px){
  .nav-list a{padding:8px 10px;font-size:14px}
}
@media (max-width:999px){
  .header-inner{border-radius:22px;gap:10px}
  .brand-tagline{display:none}
  .site-nav{
    position:absolute;top:calc(100% + 12px);left:0;right:0;
    display:none;flex-direction:column;align-items:stretch;gap:14px;
    margin:0;padding:16px;
    border-radius:var(--radius-lg);
    background:linear-gradient(165deg,rgba(12,14,22,.99),rgba(5,6,10,.99));
    border:1px solid var(--line);
    box-shadow:0 44px 96px -44px rgba(0,0,0,.96);
    max-height:min(74vh,640px);overflow-y:auto;overscroll-behavior:contain;
  }
  .site-nav[data-open="true"]{display:flex}
  .nav-list{flex-direction:column;align-items:stretch;gap:4px;width:100%}
  .nav-list a{padding:12px 14px;border-radius:14px;font-size:16px}
  .nav-quick{display:flex;flex-wrap:wrap}
  .nav-island{position:static;display:block;padding:14px;box-shadow:none;background:rgba(27,31,43,.5);border-color:var(--line-soft)}
  .island-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
  .footer-lead{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
  .grid--3,.grid--4,.grid--asym{grid-template-columns:repeat(2,minmax(0,1fr))}
}
@media (max-width:639px){
  .island-grid{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr}
  .grid--2,.grid--3,.grid--4,.grid--asym{grid-template-columns:1fr}
  .brand-name{font-size:16px}
  .nav-toggle{padding:9px 13px}
  .nav-toggle-label{display:none}
}
@media (min-width:640px) and (max-width:999px){
  .footer-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
}

/* 17. 动效降级 ------------------------------------------------------------- */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
  }
  [data-reveal]{opacity:1;transform:none}
  .card:hover,.btn:hover{transform:none}
}