/* ===========================================================
   上下分电玩 · /assets/site.css
   共享外壳：reset / 设计令牌 / 中文排版 / 页头 / 页脚 / 通用组件
   =========================================================== */

/* ---------- 1. 设计令牌 ---------- */
:root{
  --base-ink:#0D0D14;
  --panel-ink:#16161F;
  --panel-ink-2:#1B1B26;
  --edge-line:#2A2A38;
  --paper-white:#F4F4F8;
  --paper-mute:#9E9EB2;
  --neon-violet:#9A63FF;
  --arcade-teal:#14D8B6;
  --amber-warn:#FFB03A;
  --amber-deep:#5C3608;
  --signal-rose:#FF6B8A;
  --ice-dim:#3A3A4C;

  --radius-panel:24px;
  --radius-card:16px;
  --radius-pill:999px;

  --font-display:"Barlow Condensed","Oswald","Arial Narrow",system-ui,-apple-system,"PingFang SC","Microsoft YaHei",sans-serif;
  --font-heading:"Noto Sans SC","Source Han Sans SC","PingFang SC","Microsoft YaHei",system-ui,-apple-system,sans-serif;
  --font-body:"Noto Sans SC","Source Han Sans SC","PingFang SC","Microsoft YaHei",system-ui,-apple-system,sans-serif;
  --font-mono:"JetBrains Mono","IBM Plex Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;

  --header-h:72px;
  --header-h-slim:56px;
  --container:1200px;
  --gutter:clamp(16px,4vw,40px);
  --ease:cubic-bezier(.22,.61,.36,1);
}

/* ---------- 2. Reset ---------- */
*,*::before,*::after{box-sizing:border-box}
html{
  margin:0;padding:0;
  -webkit-text-size-adjust:100%;
  scroll-behavior:smooth;
  scroll-padding-top:calc(var(--header-h) + 20px);
}
body{margin:0;padding:0}
h1,h2,h3,h4,h5,h6,p,figure,blockquote,dl,dd{margin:0}
ul,ol{margin:0;padding:0;list-style:none}
img,svg,video{display:block;max-width:100%;height:auto}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
table{border-collapse:collapse;width:100%}
[hidden]{display:none!important}

/* ---------- 3. 页面基底与中文排版 ---------- */
body{
  font-family:var(--font-body);
  font-size:16px;
  line-height:1.75;
  color:var(--paper-white);
  background-color:var(--base-ink);
  background-image:
    repeating-linear-gradient(180deg,rgba(244,244,248,.018) 0 1px,transparent 1px 4px),
    radial-gradient(70% 46% at 8% -6%,rgba(154,99,255,.20),transparent 68%),
    radial-gradient(55% 42% at 102% 6%,rgba(20,216,182,.12),transparent 70%),
    radial-gradient(80% 60% at 50% 112%,rgba(255,176,58,.08),transparent 72%);
  background-attachment:fixed;
  min-height:100vh;
  display:flex;
  flex-direction:column;
  -webkit-font-smoothing:antialiased;
  letter-spacing:.01em;
}

main{flex:1 0 auto;position:relative;z-index:1}

h1,h2,h3,h4{font-family:var(--font-heading);font-weight:700;line-height:1.25;letter-spacing:.005em}

p{max-width:76ch}

strong{font-weight:700;color:var(--paper-white)}

::selection{background:rgba(154,99,255,.45);color:var(--paper-white)}

:focus-visible{outline:2px solid var(--arcade-teal);outline-offset:3px;border-radius:6px}

/* ---------- 4. 通用工具类 ---------- */
.container{width:100%;max-width:var(--container);margin-inline:auto;padding-inline:var(--gutter)}
.container--narrow{max-width:820px}

.section{position:relative;padding-block:clamp(40px,6vw,88px)}
.section-head{display:grid;gap:10px;margin-bottom:clamp(22px,3vw,40px)}
.section-index{
  font-family:var(--font-mono);
  font-size:13px;
  font-variant-numeric:tabular-nums;
  letter-spacing:.18em;
  color:var(--neon-violet);
}
.section-title{font-size:clamp(24px,3.4vw,36px)}
.section-sub{color:var(--paper-mute);font-size:15px;max-width:62ch}

.stack-panels{display:flex;flex-direction:column;gap:clamp(16px,2vw,28px)}

.grid{display:grid;gap:clamp(16px,2vw,28px)}
.grid--2{grid-template-columns:repeat(2,minmax(0,1fr))}
.grid--3{grid-template-columns:repeat(3,minmax(0,1fr))}

.muted{color:var(--paper-mute)}
.mono{font-family:var(--font-mono);font-variant-numeric:tabular-nums;letter-spacing:.02em}
.text-warn{color:var(--amber-warn)}
.text-teal{color:var(--arcade-teal)}
.text-violet{color:var(--neon-violet)}

.divider{color:var(--ice-dim);padding-inline:8px}

.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;
}

/* ---------- 5. 页头 ---------- */
.skip-link{
  position:absolute;left:16px;top:-72px;z-index:90;
  padding:10px 18px;border-radius:0 0 12px 12px;
  background:var(--neon-violet);color:#0B0B12;
  font-family:var(--font-heading);font-weight:700;font-size:14px;
  transition:top .2s var(--ease);
}
.skip-link:focus{top:0}

.site-header{
  position:sticky;top:0;z-index:60;
  background:rgba(13,13,20,.86);
  backdrop-filter:blur(14px);
  -webkit-backdrop-filter:blur(14px);
  border-bottom:1px solid var(--edge-line);
}

.header-inner{
  display:flex;
  align-items:center;
  gap:clamp(10px,2vw,24px);
  width:100%;
  max-width:var(--container);
  margin-inline:auto;
  padding-inline:var(--gutter);
  height:var(--header-h);
  transition:height .25s var(--ease);
}
.site-header.is-slim .header-inner{height:var(--header-h-slim)}

.brand{
  position:relative;
  display:inline-flex;
  flex-direction:column;
  gap:1px;
  padding-bottom:9px;
  flex:0 0 auto;
}
.brand-name{
  font-family:var(--font-heading);
  font-weight:700;
  font-size:20px;
  line-height:1.15;
  letter-spacing:.08em;
  color:var(--paper-white);
  transition:font-size .25s var(--ease);
}
.brand-sub{
  font-family:var(--font-mono);
  font-size:11px;
  line-height:1.2;
  letter-spacing:.14em;
  color:var(--paper-mute);
}
.brand-rule{
  position:absolute;left:0;bottom:0;
  width:46px;height:2px;border-radius:2px;
  background:var(--neon-violet);
  box-shadow:0 0 12px rgba(154,99,255,.85);
}
.site-header.is-slim .brand-name{font-size:18px}

.site-nav{
  display:flex;
  align-items:center;
  gap:4px;
  margin-left:auto;
}
.nav-list{display:flex;align-items:center;gap:2px;flex-wrap:wrap}
.nav-item{display:block}
.nav-link{
  position:relative;
  display:inline-block;
  padding:10px 12px;
  border-radius:var(--radius-pill);
  font-family:var(--font-heading);
  font-size:15px;
  font-weight:500;
  letter-spacing:.03em;
  color:var(--paper-mute);
  transition:color .2s var(--ease),background-color .2s var(--ease),font-size .25s var(--ease);
}
.site-header.is-slim .nav-link{font-size:14px}
.nav-link::after{
  content:"";position:absolute;left:12px;right:12px;bottom:3px;height:3px;
  border-radius:var(--radius-pill);
  background:var(--amber-warn);
  transform:scaleX(0);transform-origin:left center;
  transition:transform .24s var(--ease);
}
.nav-link:hover{color:var(--paper-white);background:rgba(154,99,255,.10)}
.nav-link[aria-current="page"]{
  color:var(--paper-white);
  background:rgba(154,99,255,.14);
}
.nav-link[aria-current="page"]::after{transform:scaleX(1)}

.nav-foot{display:none}
.nav-foot-title{
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.16em;
  color:var(--amber-warn);
  margin-bottom:10px;
}

.header-utility{position:relative;flex:0 0 auto}
.utility-toggle{
  display:inline-flex;align-items:center;gap:9px;
  padding:8px 15px;
  border-radius:var(--radius-pill);
  border:1px solid var(--amber-deep);
  background:rgba(92,54,8,.38);
  color:var(--amber-warn);
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.1em;
  transition:background-color .2s var(--ease),border-color .2s var(--ease),transform .2s var(--ease);
}
.utility-toggle:hover{background:rgba(92,54,8,.7);border-color:var(--amber-warn);transform:translateY(-1px)}
.utility-toggle[aria-expanded="true"]{background:var(--amber-warn);color:#1A1002;border-color:var(--amber-warn)}
.utility-label{white-space:nowrap}

.status-dot{
  width:8px;height:8px;border-radius:50%;
  background:var(--arcade-teal);
  box-shadow:0 0 0 3px rgba(20,216,182,.18);
  animation:dotPulse 2.4s var(--ease) infinite;
}
@keyframes dotPulse{0%,100%{opacity:1}50%{opacity:.35}}

.utility-panel{
  position:absolute;right:0;top:calc(100% + 12px);
  width:min(320px,calc(100vw - 32px));
  padding:18px;
  border-radius:var(--radius-card);
  background:var(--panel-ink);
  border:1px solid var(--edge-line);
  box-shadow:0 24px 48px -24px rgba(0,0,0,.9),0 0 0 1px rgba(154,99,255,.14);
  display:grid;gap:12px;
  z-index:70;
}
.utility-title{
  font-family:var(--font-mono);
  font-size:12px;letter-spacing:.14em;
  color:var(--paper-mute);
}
.utility-list{display:grid;gap:8px}
.utility-item{
  display:flex;align-items:center;gap:10px;
  font-size:13px;color:var(--paper-white);
}
.utility-code{
  flex:0 0 auto;
  font-family:var(--font-mono);
  font-variant-numeric:tabular-nums;
  font-size:11px;
  padding:2px 7px;
  border-radius:6px;
  background:var(--paper-white);
  color:var(--base-ink);
  letter-spacing:.04em;
}

.nav-toggle{
  display:none;
  flex:0 0 auto;
  width:44px;height:44px;
  border-radius:14px;
  border:1px solid var(--edge-line);
  background:rgba(22,22,31,.9);
  flex-direction:column;
  align-items:center;
  justify-content:center;
  gap:5px;
  transition:border-color .2s var(--ease),background-color .2s var(--ease);
}
.nav-toggle:hover{border-color:var(--neon-violet)}
.nav-toggle-bar{
  display:block;width:20px;height:2px;border-radius:2px;
  background:var(--paper-white);
  transition:transform .24s var(--ease),opacity .18s var(--ease);
}
.nav-toggle[aria-expanded="true"]{border-color:var(--amber-warn)}
.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(1){transform:translateY(7px) rotate(45deg);background:var(--amber-warn)}
.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(2){opacity:0}
.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(3){transform:translateY(-7px) rotate(-45deg);background:var(--amber-warn)}

.scroll-progress{
  position:absolute;left:0;right:0;bottom:-1px;height:2px;
  background:rgba(42,42,56,.55);
  overflow:hidden;
}
.scroll-progress-fill{
  display:block;height:100%;width:0;
  background:linear-gradient(90deg,var(--neon-violet),var(--arcade-teal));
  transition:width .12s linear;
}

/* ---------- 6. 页脚 ---------- */
.site-footer{
  position:relative;z-index:1;
  margin-top:clamp(40px,6vw,80px);
  border-top:1px solid var(--edge-line);
  background:
    linear-gradient(180deg,rgba(22,22,31,.75) 0%,rgba(13,13,20,1) 72%),
    radial-gradient(60% 80% at 12% 0%,rgba(154,99,255,.16),transparent 70%);
  padding-block:clamp(32px,5vw,64px) clamp(20px,3vw,32px);
}
.footer-inner{display:grid;gap:clamp(24px,3vw,40px)}

.footer-top{
  display:grid;
  grid-template-columns:minmax(220px,1fr) minmax(0,2.2fr);
  gap:clamp(24px,4vw,56px);
  align-items:start;
}
.footer-brand{display:grid;gap:10px;align-content:start}
.footer-brand-link{
  font-family:var(--font-heading);
  font-weight:700;
  font-size:22px;
  letter-spacing:.08em;
  color:var(--paper-white);
  padding-bottom:6px;
  border-bottom:2px solid var(--neon-violet);
  justify-self:start;
  transition:color .2s var(--ease);
}
.footer-brand-link:hover{color:var(--neon-violet)}
.footer-tagline{font-size:14px;color:var(--paper-mute);max-width:30ch}
.footer-meta{
  font-family:var(--font-mono);
  font-size:12px;
  line-height:1.8;
  color:var(--paper-mute);
  opacity:.85;
  max-width:34ch;
}

.footer-cols{
  display:grid;
  grid-template-columns:repeat(4,minmax(0,1fr));
  gap:clamp(16px,2vw,28px);
}
.footer-col{display:grid;gap:12px;align-content:start}
.footer-col-title{
  font-size:14px;
  font-weight:700;
  letter-spacing:.06em;
  color:var(--paper-white);
  padding-bottom:8px;
  border-bottom:1px solid var(--edge-line);
}
.footer-list{display:grid;gap:8px}
.footer-link{
  font-size:14px;
  color:var(--paper-mute);
  transition:color .2s var(--ease),padding-left .2s var(--ease);
}
.footer-link:hover{color:var(--neon-violet);padding-left:4px}

.footer-contact{
  display:grid;
  gap:12px;
  padding:clamp(16px,2.4vw,24px);
  padding-left:calc(clamp(16px,2.4vw,24px) - 8px);
  border-radius:var(--radius-card);
  background:rgba(22,22,31,.72);
  border:1px solid var(--edge-line);
  border-left:2px solid var(--amber-warn);
  margin-left:8px;
}
.contact-label{
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.16em;
  color:var(--amber-warn);
}
.contact-grid{
  display:grid;
  grid-template-columns:repeat(3,minmax(0,1fr));
  gap:14px 24px;
}
.contact-item{display:grid;gap:4px;align-content:start}
.contact-item .contact-label{color:var(--paper-mute);letter-spacing:.1em}
.contact-value{
  font-family:var(--font-mono);
  font-variant-numeric:tabular-nums;
  font-size:13px;
  color:var(--paper-white);
  word-break:break-word;
}
.footer-note{font-size:13px;line-height:1.7;color:var(--paper-mute);max-width:70ch}

.footer-bottom{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:10px 18px;
  padding-top:20px;
  border-top:1px solid var(--edge-line);
  font-size:13px;
  color:var(--paper-mute);
}
.footer-copy{font-size:13px;color:var(--paper-mute);max-width:none}
.footer-icp{
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.06em;
  color:var(--paper-mute);
}
.footer-legal{margin-left:auto;display:inline-flex;align-items:center;font-size:13px}

.back-to-top{
  position:fixed;right:20px;bottom:20px;z-index:80;
  width:48px;height:48px;
  display:grid;place-items:center;
  border-radius:50%;
  border:1px solid var(--edge-line);
  background:rgba(22,22,31,.94);
  color:var(--paper-white);
  font-size:18px;
  box-shadow:0 12px 32px -16px rgba(0,0,0,.9);
  opacity:0;visibility:hidden;
  transition:opacity .24s var(--ease),visibility .24s var(--ease),border-color .2s var(--ease),transform .2s var(--ease);
}
.back-to-top.is-visible{opacity:1;visibility:visible}
.back-to-top:hover{transform:translateY(-3px);border-color:var(--neon-violet);color:var(--neon-violet)}

/* ---------- 7. 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-family:var(--font-heading);
  font-weight:700;
  font-size:15px;
  letter-spacing:.03em;
  line-height:1.2;
  text-align:center;
  transition:transform .2s var(--ease),background-color .2s var(--ease),color .2s var(--ease),border-color .2s var(--ease),box-shadow .2s var(--ease);
}
.btn--primary{
  background:var(--neon-violet);
  color:#0B0B12;
  box-shadow:0 10px 30px -14px rgba(154,99,255,.95);
}
.btn--primary:hover{transform:translateY(-2px);box-shadow:0 16px 36px -16px rgba(154,99,255,1)}
.btn--ghost{
  background:transparent;
  border-color:var(--edge-line);
  color:var(--paper-white);
}
.btn--ghost:hover{border-color:var(--neon-violet);color:var(--paper-white);transform:translateY(-2px)}
.btn--warn{
  background:var(--amber-warn);
  color:#1A1002;
  box-shadow:0 10px 28px -16px rgba(255,176,58,.9);
}
.btn--warn:hover{transform:translateY(-2px)}
.btn--sm{padding:8px 16px;font-size:13px;border-radius:var(--radius-pill)}

/* ---------- 8. 面包屑 ---------- */
.breadcrumbs{padding-block:18px 0}
.breadcrumb-list{display:flex;flex-wrap:wrap;align-items:center;gap:8px;font-size:13px}
.breadcrumb-item{display:inline-flex;align-items:center;gap:8px;color:var(--paper-mute)}
.breadcrumb-item + .breadcrumb-item::before{
  content:"/";color:var(--ice-dim);font-family:var(--font-mono);
}
.breadcrumb-link{color:var(--paper-mute);transition:color .2s var(--ease)}
.breadcrumb-link:hover{color:var(--neon-violet)}
.breadcrumb-current{color:var(--paper-white)}

/* ---------- 9. 面板与章节组件 ---------- */
.panel{
  position:relative;
  background:var(--panel-ink);
  border:1px solid var(--edge-line);
  border-radius:var(--radius-panel);
  padding:clamp(20px,3vw,36px);
  overflow:hidden;
}
.panel::after{
  content:"";
  position:absolute;top:0;left:0;right:0;height:2px;
  background:linear-gradient(90deg,transparent,var(--neon-violet),var(--arcade-teal),transparent);
  transform:scaleX(0);transform-origin:left center;
  transition:transform .5s var(--ease);
}
.panel:hover::after{transform:scaleX(1)}
.panel--offset{margin-left:clamp(0px,4vw,56px)}
.panel--warn{
  background:rgba(92,54,8,.32);
  border-color:var(--amber-deep);
  border-left:2px solid var(--amber-warn);
  margin-left:8px;
}

.panel-head{
  display:flex;
  align-items:flex-start;
  gap:clamp(12px,2vw,24px);
  margin-bottom:clamp(14px,2vw,22px);
}
.panel-index{
  flex:0 0 auto;
  font-family:var(--font-display);
  font-weight:700;
  font-size:clamp(48px,7vw,88px);
  line-height:.82;
  letter-spacing:-.01em;
  color:rgba(154,99,255,.18);
  -webkit-text-stroke:1px var(--neon-violet);
  text-shadow:0 0 26px rgba(154,99,255,.35);
}
.panel-title{font-size:clamp(20px,2.4vw,28px)}
.panel-sub{font-size:14px;color:var(--paper-mute);margin-top:6px}
.panel-body{display:grid;gap:16px;font-size:16px}
.panel-body > p{color:var(--paper-white)}

/* ---------- 10. 数据卡与统计 ---------- */
.data-card{
  display:grid;gap:6px;align-content:start;
  background:var(--panel-ink-2);
  border:1px solid var(--edge-line);
  border-radius:var(--radius-card);
  padding:16px 18px;
}
.data-card-value{
  font-family:var(--font-display);
  font-variant-numeric:tabular-nums;
  font-size:clamp(30px,4vw,48px);
  line-height:1;
  letter-spacing:-.01em;
  color:var(--paper-white);
  -webkit-text-stroke:0;
}
.data-card-label{font-size:13px;color:var(--paper-mute)}

.stat-row{
  display:flex;flex-wrap:wrap;
  gap:clamp(16px,3vw,40px);
  align-items:flex-end;
}
.stat{display:grid;gap:4px}
.stat-value{
  font-family:var(--font-display);
  font-variant-numeric:tabular-nums;
  font-size:clamp(36px,5vw,64px);
  line-height:.95;
  letter-spacing:-.01em;
  color:var(--paper-white);
}
.stat-label{
  font-family:var(--font-mono);
  font-size:12px;letter-spacing:.12em;
  color:var(--paper-mute);
}

.meter{
  height:8px;border-radius:var(--radius-pill);
  background:var(--ice-dim);
  overflow:hidden;
}
.meter-fill{
  display:block;height:100%;width:var(--meter-value,0%);
  border-radius:var(--radius-pill);
  background:linear-gradient(90deg,var(--arcade-teal),#63FFE0);
  box-shadow:0 0 14px rgba(20,216,182,.5);
  transition:width .6s var(--ease);
}

/* ---------- 11. 条款与警示 ---------- */
.rule-block{display:grid;gap:12px;border-radius:var(--radius-card)}
.rule-item{
  display:grid;
  grid-template-columns:auto minmax(0,1fr);
  gap:12px;
  align-items:start;
  padding:14px 16px;
  border-radius:var(--radius-card);
  background:rgba(27,27,38,.85);
  border:1px solid var(--edge-line);
}
.rule-code{
  font-family:var(--font-mono);
  font-variant-numeric:tabular-nums;
  font-size:12px;
  letter-spacing:.04em;
  padding:3px 9px;
  border-radius:6px;
  background:var(--paper-white);
  color:var(--base-ink);
  white-space:nowrap;
}
.rule-text{font-size:15px;line-height:1.7;color:var(--paper-white)}
.rule-text .mono{color:var(--arcade-teal)}

.warn-note{
  margin-left:8px;
  padding:14px 18px;
  border-radius:0 var(--radius-card) var(--radius-card) 0;
  border-left:2px solid var(--amber-warn);
  background:rgba(92,54,8,.5);
  color:var(--paper-white);
  font-family:var(--font-mono);
  font-size:13px;
  line-height:1.7;
}
.warn-note .rule-code{background:var(--amber-warn);color:#1A1002}

/* ---------- 12. 标签与胶囊 ---------- */
.tag-list{display:flex;flex-wrap:wrap;gap:8px}
.tag{
  display:inline-flex;align-items:center;
  padding:5px 12px;
  border-radius:var(--radius-pill);
  border:1px solid var(--edge-line);
  background:rgba(58,58,76,.35);
  font-size:12px;
  letter-spacing:.06em;
  color:var(--paper-mute);
}
.pill{
  display:inline-flex;align-items:center;gap:6px;
  padding:5px 13px;
  border-radius:var(--radius-pill);
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.08em;
  border:1px solid transparent;
}
.pill--violet{background:rgba(154,99,255,.16);color:#C7A6FF;border-color:rgba(154,99,255,.45)}
.pill--teal{background:rgba(20,216,182,.14);color:#6BF0DA;border-color:rgba(20,216,182,.4)}
.pill--warn{background:rgba(255,176,58,.16);color:var(--amber-warn);border-color:rgba(255,176,58,.45)}
.pill--muted{background:rgba(58,58,76,.4);color:var(--paper-mute);border-color:var(--edge-line)}

/* ---------- 13. 筛选与索引 ---------- */
.filter-bar{display:flex;flex-wrap:wrap;gap:10px;align-items:center}
.filter-btn{
  padding:8px 16px;
  border-radius:var(--radius-pill);
  border:1px solid var(--edge-line);
  background:transparent;
  color:var(--paper-mute);
  font-family:var(--font-heading);
  font-weight:700;
  font-size:13px;
  letter-spacing:.03em;
  transition:color .2s var(--ease),border-color .2s var(--ease),background-color .2s var(--ease);
}
.filter-btn:hover{color:var(--paper-white);border-color:var(--ice-dim)}
.filter-btn[aria-pressed="true"]{
  background:var(--neon-violet);
  border-color:var(--neon-violet);
  color:#0B0B12;
}
.filter-count{
  font-family:var(--font-mono);
  font-size:12px;
  color:var(--paper-mute);
  letter-spacing:.08em;
}

.index-jump{display:flex;flex-wrap:wrap;gap:8px}
.index-jump-link{
  display:inline-flex;align-items:center;gap:9px;
  padding:9px 15px;
  border-radius:12px;
  border:1px solid var(--edge-line);
  background:rgba(22,22,31,.82);
  color:var(--paper-mute);
  font-size:14px;
  cursor:pointer;
  transition:border-color .2s var(--ease),color .2s var(--ease),transform .2s var(--ease);
}
.index-jump-link:hover{border-color:var(--neon-violet);color:var(--paper-white);transform:translateX(3px)}
.index-jump-num{
  font-family:var(--font-mono);
  font-variant-numeric:tabular-nums;
  font-size:12px;
  color:var(--neon-violet);
}

/* ---------- 14. 图片容器（页面阶段放入图片） ---------- */
.media-frame{
  position:relative;
  display:block;
  width:100%;
  aspect-ratio:16/10;
  border-radius:var(--radius-card);
  border:1px solid var(--edge-line);
  background-color:var(--panel-ink);
  overflow:hidden;
}
.media-frame::after{
  content:"";
  position:absolute;inset:0;pointer-events:none;
  background:linear-gradient(180deg,transparent 46%,rgba(13,13,20,.72) 100%);
}
.media-frame img{
  width:100%;height:100%;
  object-fit:cover;
  filter:saturate(1.05) contrast(1.04);
}
.media-frame--wide{aspect-ratio:21/9}
.media-frame--tall{aspect-ratio:3/4}
.media-frame--square{aspect-ratio:1/1}
.media-frame--placeholder{
  background-image:repeating-linear-gradient(135deg,rgba(58,58,76,.5) 0 14px,transparent 14px 28px);
}
.media-frame-caption{
  margin-top:10px;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.06em;
  color:var(--paper-mute);
}
.media-frame--glow{box-shadow:0 0 0 1px rgba(154,99,255,.25),0 24px 60px -32px rgba(154,99,255,.8)}

/* ---------- 15. 显现动效 ---------- */
html.js [data-reveal]{opacity:0;transform:translateY(12px)}
html.js [data-reveal].is-visible{
  opacity:1;transform:translateY(0);
  transition:opacity .3s var(--ease),transform .3s var(--ease);
}

/* ---------- 16. 响应式 ---------- */
@media (max-width:1040px){
  .footer-top{grid-template-columns:minmax(0,1fr)}
  .footer-cols{grid-template-columns:repeat(2,minmax(0,1fr))}
  .contact-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
}

@media (max-width:900px){
  :root{--header-h:64px}
  .site-header.is-slim .header-inner{height:var(--header-h)}

  .header-utility{display:none}
  .nav-toggle{display:flex;margin-left:auto}

  .site-nav{
    position:fixed;
    top:var(--header-h);left:0;right:0;bottom:0;
    display:none;
    flex-direction:column;
    align-items:stretch;
    gap:0;
    margin-left:0;
    padding:24px var(--gutter) 40px;
    background:var(--base-ink);
    border-top:1px solid var(--edge-line);
    overflow-y:auto;
    z-index:65;
  }
  .site-nav[data-open="true"]{display:flex;animation:navIn .24s var(--ease)}
  @keyframes navIn{from{opacity:0;transform:translateY(-8px)}to{opacity:1;transform:translateY(0)}}

  .nav-list{flex-direction:column;align-items:stretch;gap:6px;flex-wrap:nowrap}
  .nav-link{
    display:block;
    padding:16px 18px;
    border-radius:var(--radius-card);
    border:1px solid var(--edge-line);
    background:var(--panel-ink);
    font-size:17px;
    color:var(--paper-white);
  }
  .site-header.is-slim .nav-link{font-size:17px}
  .nav-link::after{left:18px;right:auto;width:38px;bottom:10px}
  .nav-link[aria-current="page"]{border-color:rgba(154,99,255,.55);background:rgba(154,99,255,.16)}

  .nav-foot{
    display:grid;
    gap:12px;
    margin-top:28px;
    padding-top:20px;
    border-top:1px solid var(--edge-line);
  }

  body.nav-open{overflow:hidden}

  .back-to-top{right:14px;bottom:14px;width:44px;height:44px}
}

@media (max-width:640px){
  .grid--2,.grid--3{grid-template-columns:minmax(0,1fr)}
  .footer-cols{grid-template-columns:minmax(0,1fr)}
  .contact-grid{grid-template-columns:minmax(0,1fr)}
  .panel--offset{margin-left:0}
  .panel--warn{margin-left:0}
  .warn-note{margin-left:0}
  .footer-contact{margin-left:0}
  .footer-legal{margin-left:0;width:100%}
  .stat-row{gap:20px}
}

/* ---------- 17. 无障碍偏好 ---------- */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms!important;
    animation-iteration-count:1!important;
    transition-duration:.001ms!important;
  }
  html.js [data-reveal]{opacity:1!important;transform:none!important}
  .back-to-top{transition:none}
  .scroll-progress-fill{transition:none}
}