/* ============================================================
   易倍 EMC · 共享样式 /assets/site.css
   夜间赛场指挥台：墨夜底 + 细网格 + 玻璃胶囊 + 奶油纸版权页
   ============================================================ */

/* ---------- 1. Reset ---------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;scroll-padding-top:104px}
body{margin:0;min-height:100vh}
h1,h2,h3,h4,h5,p,figure,blockquote{margin:0}
img,svg,video{max-width:100%;height:auto}
ul[class],ol[class]{list-style:none;margin:0;padding:0}
button{font:inherit;color:inherit}
a{color:inherit}

/* ---------- 2. Design tokens ---------- */
:root{
  --ink:#061A15;
  --ink-2:#0C2A22;
  --ink-3:#04120E;
  --paper:#F2E8D5;
  --paper-2:#E7DAC1;
  --brown:#1B1712;
  --cyan:#35F2C5;
  --amber:#FF9F45;
  --gold:#C9A96A;
  --mist:#8FA79D;
  --alert:#D4552D;

  --line-gold:rgba(201,169,106,.24);
  --line-paper:rgba(242,232,213,.14);
  --glass:rgba(12,42,34,.66);
  --text-body:#CFE0D8;

  --font-serif:'Noto Serif SC','Source Han Serif SC','Songti SC',serif;
  --font-sans:'Inter','Noto Sans SC','PingFang SC','Microsoft YaHei',sans-serif;
  --font-mono:'JetBrains Mono','IBM Plex Mono','SFMono-Regular',ui-monospace,monospace;

  --shell:1200px;
  --gutter:clamp(16px,4vw,32px);
  --radius-capsule:999px;

  --ease:cubic-bezier(.22,.61,.36,1);
  --fast:160ms;
}

/* ---------- 3. Base / 中文排版 ---------- */
body{
  font-family:var(--font-sans);
  font-size:16px;
  line-height:28px;
  letter-spacing:.01em;
  color:var(--text-body);
  background-color:var(--ink);
  background-image:
    radial-gradient(900px 520px at 84% -10%,rgba(53,242,197,.13),transparent 62%),
    radial-gradient(720px 460px at 4% 2%,rgba(255,159,69,.09),transparent 60%),
    repeating-linear-gradient(0deg,rgba(143,167,157,.065) 0 1px,transparent 1px 48px),
    repeating-linear-gradient(90deg,rgba(143,167,157,.065) 0 1px,transparent 1px 48px);
  background-attachment:fixed;
  overflow-wrap:break-word;
}
p,li{line-height:1.78}
h1,h2,h3,h4{color:var(--paper);text-wrap:balance}
a{text-decoration-thickness:1px;text-underline-offset:3px}

:focus-visible{outline:2px solid var(--cyan);outline-offset:3px;border-radius:4px}
.footer-colophon :focus-visible{outline-color:#A63C1B}

/* ---------- 4. 布局工具 ---------- */
.container{width:100%;max-width:var(--shell);margin-inline:auto;padding-inline:var(--gutter)}
.section{padding-block:clamp(40px,6vw,88px)}
.section-head{display:flex;flex-wrap:wrap;align-items:flex-end;justify-content:space-between;gap:12px 24px;margin-bottom:clamp(20px,3vw,36px)}
.grid{display:grid;gap:clamp(16px,2.2vw,28px)}
.grid-2{display:grid;gap:clamp(16px,2.2vw,28px);grid-template-columns:repeat(auto-fit,minmax(260px,1fr))}
.grid-3{display:grid;gap:clamp(16px,2.2vw,28px);grid-template-columns:repeat(auto-fit,minmax(220px,1fr))}
.grid-12{display:grid;gap:clamp(16px,2.2vw,28px);grid-template-columns:repeat(12,minmax(0,1fr))}
.divider{height:1px;border:0;margin:clamp(24px,4vw,48px) 0;background:linear-gradient(90deg,transparent,var(--line-gold) 12%,var(--line-gold) 88%,transparent)}

/* ---------- 5. 文字体系 ---------- */
.display{font-family:var(--font-serif);font-weight:600;font-size:clamp(28px,4.6vw,56px);line-height:1.14;letter-spacing:-.01em;color:var(--paper)}
.section-title{font-family:var(--font-serif);font-weight:600;font-size:clamp(22px,2.6vw,32px);line-height:1.3;letter-spacing:0;color:var(--paper)}
.lede{font-size:clamp(15px,1.6vw,18px);line-height:1.85;color:var(--text-body);max-width:68ch}
.eyebrow{display:inline-flex;align-items:center;gap:10px;font-family:var(--font-mono);font-weight:600;font-size:12px;line-height:1;letter-spacing:.2em;text-transform:uppercase;color:var(--cyan)}
.eyebrow::before{content:"";width:22px;height:1px;background:linear-gradient(90deg,var(--cyan),transparent)}
.num{font-family:var(--font-mono);font-weight:700;font-variant-numeric:tabular-nums;letter-spacing:-.02em;color:var(--paper);text-shadow:0 0 18px rgba(53,242,197,.34)}
.num--amber{color:var(--amber);text-shadow:0 0 18px rgba(255,159,69,.4)}
.mono-label{font-family:var(--font-mono);font-size:12px;line-height:18px;letter-spacing:.14em;text-transform:uppercase;color:var(--mist)}
.tag{display:inline-flex;align-items:center;gap:6px;padding:5px 10px;border-radius:var(--radius-capsule);border:1px solid rgba(53,242,197,.34);background:rgba(53,242,197,.08);color:#9FF3DC;font-family:var(--font-mono);font-size:12px;line-height:16px;letter-spacing:.08em}
.metric{display:flex;flex-direction:column;gap:2px}
.metric .num{font-size:clamp(24px,3vw,36px);line-height:1.1}

/* ---------- 6. 按钮 ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:12px 20px;border-radius:var(--radius-capsule);
  border:1px solid transparent;background:none;cursor:pointer;
  font-family:var(--font-sans);font-weight:600;font-size:14px;line-height:1;letter-spacing:.02em;
  text-decoration:none;white-space:nowrap;
  transition:transform var(--fast) var(--ease),box-shadow var(--fast) var(--ease),background-color var(--fast) var(--ease),border-color var(--fast) var(--ease),color var(--fast) var(--ease);
}
.btn-accent{
  background:linear-gradient(135deg,#FFC078,#FF9F45 55%,#E8791F);
  color:#20160A;
  box-shadow:0 12px 26px -16px rgba(255,159,69,.95),inset 0 1px 0 rgba(255,255,255,.38);
}
.btn-accent:hover{transform:translateY(-1px);box-shadow:0 16px 30px -14px rgba(255,159,69,.95),inset 0 1px 0 rgba(255,255,255,.45)}
.btn-ghost{border-color:rgba(201,169,106,.42);background:rgba(12,42,34,.55);color:var(--paper)}
.btn-ghost:hover{border-color:var(--cyan);color:#B8FFEE;background:rgba(53,242,197,.1)}
.btn-sm{padding:9px 15px;font-size:13px}
.btn:active{transform:translateY(0) scale(.985)}

/* ---------- 7. Skip link ---------- */
.skip-link{
  position:fixed;top:8px;left:8px;z-index:200;
  padding:10px 16px;border-radius:10px;
  background:var(--paper);color:var(--brown);
  font-family:var(--font-sans);font-weight:600;font-size:13px;line-height:1;
  text-decoration:none;box-shadow:0 12px 30px -14px #000;
  transform:translateY(-180%);
  transition:transform var(--fast) var(--ease);
}
.skip-link:focus,.skip-link:focus-visible{transform:translateY(0)}

/* ---------- 8. Header 悬浮胶囊浮岛 ---------- */
.site-header{position:sticky;top:0;z-index:80;padding:12px var(--gutter) 10px}
.header-inner{
  position:relative;
  display:flex;align-items:center;gap:14px;
  width:100%;max-width:var(--shell);margin-inline:auto;
  padding:10px 12px 10px 16px;
  border-radius:22px;
  border:1px solid var(--line-gold);
  background:linear-gradient(180deg,rgba(12,42,34,.94),rgba(6,26,21,.88));
  box-shadow:0 20px 44px -28px rgba(0,0,0,.95),inset 0 1px 0 rgba(242,232,213,.07);
  -webkit-backdrop-filter:blur(14px) saturate(130%);
  backdrop-filter:blur(14px) saturate(130%);
  transition:padding var(--fast) var(--ease),border-radius var(--fast) var(--ease),background var(--fast) var(--ease);
}
.site-header[data-condensed] .header-inner{
  padding-block:6px;border-radius:16px;
  background:linear-gradient(180deg,rgba(10,36,29,.97),rgba(4,18,14,.95));
}

/* 品牌 */
.brand{display:inline-flex;align-items:center;gap:10px;flex:0 0 auto;text-decoration:none;color:var(--paper)}
.brand-mark{
  position:relative;width:30px;height:30px;flex:0 0 auto;border-radius:10px;
  background:linear-gradient(150deg,#4CFFD4,#35F2C5 32%,#0C2A22 96%);
  box-shadow:inset 0 0 0 1px rgba(242,232,213,.3),0 10px 20px -12px rgba(53,242,197,.95);
}
.brand-mark::before{
  content:"";position:absolute;inset:8px;border-radius:3px;
  border:1.5px solid rgba(6,26,21,.8);border-bottom-color:transparent;border-right-color:transparent;
  transform:rotate(-45deg);
}
.brand-mark::after{
  content:"";position:absolute;left:50%;top:50%;width:5px;height:5px;margin:-2.5px;
  border-radius:50%;background:var(--amber);box-shadow:0 0 10px rgba(255,159,69,.95);
}
.brand-text{display:flex;flex-direction:column;gap:3px;line-height:1}
.brand-name{font-family:var(--font-sans);font-weight:600;font-size:15px;line-height:1.1;letter-spacing:.05em;color:var(--paper)}
.brand-sub{font-family:var(--font-sans);font-weight:500;font-size:11px;line-height:1;letter-spacing:.18em;color:var(--mist)}

/* 导航 */
.nav-island{margin-inline:auto}
.nav-list{display:flex;align-items:center;gap:2px}
.nav-item{display:block}
.nav-link{
  display:block;padding:9px 13px;border-radius:var(--radius-capsule);
  font-family:var(--font-sans);font-weight:600;font-size:14px;line-height:1;letter-spacing:.03em;
  color:#C9DCD4;text-decoration:none;
  transition:color var(--fast) var(--ease),background-color var(--fast) var(--ease),box-shadow var(--fast) var(--ease);
}
.nav-link:hover{color:var(--paper);background:rgba(53,242,197,.1)}
.nav-link[aria-current="page"]{
  color:#04170F;
  background:linear-gradient(180deg,#8BFFE1,#35F2C5 70%);
  box-shadow:0 0 0 1px rgba(53,242,197,.55),0 10px 22px -14px rgba(53,242,197,.95);
}
.nav-link[aria-current="page"]:hover{color:#04170F;background:linear-gradient(180deg,#9DFFE8,#4CFFD4)}
.nav-cta{display:none}

/* 头部右侧 */
.header-actions{display:flex;align-items:center;gap:8px;flex:0 0 auto}
.header-cta{display:inline-flex}

/* 目录按钮 */
.nav-toggle{
  display:none;align-items:center;gap:8px;
  padding:9px 12px;border-radius:var(--radius-capsule);
  border:1px solid rgba(242,232,213,.24);background:rgba(6,26,21,.62);
  color:var(--paper);cursor:pointer;
  font-family:var(--font-sans);font-weight:600;font-size:12px;line-height:1;letter-spacing:.06em;
  transition:border-color var(--fast) var(--ease),background-color var(--fast) var(--ease);
}
.nav-toggle:hover{border-color:rgba(53,242,197,.6);background:rgba(53,242,197,.1)}
.nav-toggle-box{display:inline-flex;flex-direction:column;justify-content:center;gap:4px;width:16px;height:14px}
.nav-toggle-bar{display:block;height:2px;width:100%;border-radius:2px;background:currentColor;transition:transform var(--fast) var(--ease),opacity var(--fast) var(--ease),width var(--fast) var(--ease)}
.nav-toggle-bar:nth-child(2){width:68%}
.site-header[data-open] .nav-toggle-bar:nth-child(1){transform:translateY(6px) rotate(45deg)}
.site-header[data-open] .nav-toggle-bar:nth-child(2){opacity:0;width:0}
.site-header[data-open] .nav-toggle-bar:nth-child(3){transform:translateY(-6px) rotate(-45deg)}
.nav-toggle-text{display:inline-block}

/* 阅读进度 */
.scroll-meter{position:fixed;left:0;right:0;top:0;height:2px;z-index:90;pointer-events:none;background:rgba(53,242,197,.12)}
.scroll-meter-fill{display:block;height:100%;width:0;background:linear-gradient(90deg,var(--cyan),var(--amber));box-shadow:0 0 12px rgba(53,242,197,.75);transition:width 120ms linear}

/* ---------- 9. Footer ---------- */
.site-footer{
  position:relative;margin-top:clamp(48px,7vw,96px);
  border-top:1px solid var(--line-gold);
  background:
    radial-gradient(700px 320px at 10% 0%,rgba(53,242,197,.09),transparent 62%),
    radial-gradient(620px 300px at 90% 8%,rgba(255,159,69,.07),transparent 62%),
    linear-gradient(180deg,#061A15,#04120E);
}
.footer-grid{
  width:100%;max-width:var(--shell);margin-inline:auto;
  padding:clamp(36px,5vw,64px) var(--gutter) clamp(28px,4vw,48px);
  display:grid;grid-template-columns:1.35fr .95fr 1.2fr;
  gap:clamp(24px,4vw,56px);align-items:start;
}
.footer-brand{display:flex;flex-direction:column;gap:16px;min-width:0}
.brand-footer .brand-name{font-family:var(--font-serif);font-weight:600;font-size:18px;letter-spacing:.02em}
.brand-footer .brand-sub{letter-spacing:.2em}
.footer-summary{font-size:14px;line-height:24px;color:var(--text-body);max-width:34ch}
.footer-pips{display:flex;flex-wrap:wrap;gap:8px}
.footer-pip{
  padding:7px 10px;border-radius:var(--radius-capsule);
  border:1px solid rgba(53,242,197,.3);background:rgba(53,242,197,.07);
  font-family:var(--font-mono);font-weight:600;font-size:11px;line-height:1;letter-spacing:.1em;color:#9FF3DC;
}
.footer-nav{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:20px}
.footer-col{min-width:0}
.footer-col-title{
  margin:0 0 14px;
  font-family:var(--font-mono);font-weight:600;font-size:12px;line-height:1;letter-spacing:.22em;
  text-transform:uppercase;color:var(--gold);
}
.footer-links li+li{margin-top:10px}
.footer-links a{
  display:inline-block;color:#C9DCD4;text-decoration:none;
  font-size:14px;line-height:22px;
  border-bottom:1px solid transparent;
  transition:color var(--fast) var(--ease),border-color var(--fast) var(--ease);
}
.footer-links a:hover,.footer-links a:focus-visible{color:var(--paper);border-bottom-color:var(--cyan)}

/* 玻璃联系卡 */
.footer-card{
  padding:clamp(16px,2vw,22px);
  border-radius:18px;border:1px solid var(--line-paper);
  background:var(--glass);
  -webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);
  box-shadow:inset 0 1px 0 rgba(242,232,213,.08),0 24px 48px -34px #000;
  min-width:0;
}
.footer-card-title{
  margin:0 0 12px;
  font-family:var(--font-sans);font-weight:600;font-size:13px;line-height:1;letter-spacing:.14em;
  text-transform:uppercase;color:var(--paper);
}
.contact-list{display:block}
.contact-item{
  display:grid;grid-template-columns:auto minmax(0,1fr) auto;gap:8px;align-items:center;
  padding:9px 0;border-bottom:1px dashed rgba(201,169,106,.22);
}
.contact-item:last-child{border-bottom:0}
.contact-item--wide{grid-template-columns:auto minmax(0,1fr)}
.contact-key{font-family:var(--font-mono);font-weight:600;font-size:11px;line-height:1;letter-spacing:.14em;text-transform:uppercase;color:var(--mist)}
.contact-val{font-family:var(--font-mono);font-size:13px;line-height:20px;color:var(--paper);overflow-wrap:anywhere}
.copy-btn{
  padding:5px 9px;border-radius:var(--radius-capsule);
  border:1px solid rgba(242,232,213,.26);background:rgba(6,26,21,.5);
  color:var(--text-body);cursor:pointer;
  font-family:var(--font-sans);font-weight:600;font-size:11px;line-height:1;letter-spacing:.06em;
  transition:color var(--fast) var(--ease),border-color var(--fast) var(--ease),background-color var(--fast) var(--ease);
}
.copy-btn:hover{color:var(--paper);border-color:var(--cyan);background:rgba(53,242,197,.12)}
.copy-btn[data-copied]{color:#04170F;background:linear-gradient(180deg,#8BFFE1,#35F2C5);border-color:transparent}
.footer-note{margin-top:12px;font-size:12px;line-height:20px;color:var(--mist)}
.footer-card-action{margin-top:14px;width:100%}

/* 奶油纸版权页 */
.footer-colophon{
  color:var(--brown);
  background-color:var(--paper);
  background-image:repeating-linear-gradient(90deg,rgba(27,23,18,.045) 0 1px,transparent 1px 7px);
  border-top:1px solid rgba(27,23,18,.16);
}
.colophon-inner{
  width:100%;max-width:var(--shell);margin-inline:auto;
  padding:20px var(--gutter);
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:10px 22px;
  font-size:13px;line-height:20px;
}
.colophon-brand{font-family:var(--font-serif);font-weight:600;font-size:13px;letter-spacing:.02em;color:var(--brown)}
.legal-links{display:flex;flex-wrap:wrap;gap:6px 18px}
.legal-links a{
  color:#5A4B3A;text-decoration:none;
  border-bottom:1px solid rgba(27,23,18,.24);
  transition:color var(--fast) var(--ease),border-color var(--fast) var(--ease);
}
.legal-links a:hover,.legal-links a:focus-visible{color:var(--brown);border-bottom-color:var(--alert)}
.colophon-meta{display:inline-flex;align-items:center;gap:8px;font-family:var(--font-mono);font-size:12px;line-height:18px;color:#6B5B47}
.colophon-icp{letter-spacing:.02em}
.colophon-dot{color:rgba(27,23,18,.4)}

/* 返回顶部 */
.to-top{
  position:fixed;right:clamp(12px,3vw,28px);bottom:clamp(16px,4vw,32px);z-index:70;
  display:inline-flex;align-items:center;gap:6px;
  padding:10px 14px;border-radius:var(--radius-capsule);
  border:1px solid rgba(53,242,197,.45);
  background:rgba(6,26,21,.88);color:var(--cyan);
  font-family:var(--font-mono);font-weight:600;font-size:12px;line-height:1;letter-spacing:.1em;
  cursor:pointer;
  -webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);
  box-shadow:0 14px 32px -20px #000,0 0 0 1px rgba(53,242,197,.12);
  transition:border-color var(--fast) var(--ease),color var(--fast) var(--ease),transform var(--fast) var(--ease);
}
.to-top:hover{border-color:var(--cyan);color:#B8FFEE;transform:translateY(-2px)}
.to-top[hidden]{display:none}
.to-top-arrow{font-size:13px}
.to-top-label{font-family:var(--font-sans);letter-spacing:.08em}

/* ---------- 10. 通用内容组件（页面阶段复用） ---------- */
.breadcrumb{font-size:13px;line-height:20px;color:var(--mist)}
.breadcrumb ol{display:flex;flex-wrap:wrap;align-items:center;gap:8px}
.breadcrumb li+li::before{content:"/";margin-right:8px;color:rgba(201,169,106,.55)}
.breadcrumb a{color:var(--mist);text-decoration:none}
.breadcrumb a:hover{color:var(--cyan)}
.breadcrumb [aria-current="page"]{color:var(--paper)}

.card{
  padding:clamp(16px,2vw,24px);border-radius:18px;
  border:1px solid var(--line-gold);
  background:linear-gradient(180deg,rgba(12,42,34,.9),rgba(6,26,21,.92));
  box-shadow:inset 0 1px 0 rgba(242,232,213,.06);
}
.card--paper{background:var(--paper);color:var(--brown);border-color:rgba(27,23,18,.16)}
.card--paper h2,.card--paper h3{color:var(--brown)}
.glass{
  border-radius:20px;border:1px solid var(--line-paper);
  background:var(--glass);
  -webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);
}

.prose{max-width:74ch;font-size:16px;line-height:1.85;color:var(--text-body)}
.prose>*+*{margin-top:1em}
.prose h2{margin-top:1.9em;font-family:var(--font-serif);font-weight:600;font-size:clamp(20px,2.2vw,26px);line-height:1.35;color:var(--paper);scroll-margin-top:112px}
.prose h3{margin-top:1.6em;font-family:var(--font-sans);font-weight:600;font-size:18px;line-height:1.5;color:var(--paper);scroll-margin-top:112px}
.prose ul,.prose ol{padding-left:1.35em}
.prose ul{list-style:square}
.prose ol{list-style:decimal}
.prose li+li{margin-top:.45em}
.prose a{color:var(--cyan);text-decoration:underline;text-decoration-color:rgba(53,242,197,.45)}
.prose a:hover{text-decoration-color:var(--cyan)}
.prose strong{color:var(--paper)}
.prose blockquote{
  margin:1.4em 0;padding:4px 0 4px 18px;
  border-left:2px solid var(--gold);
  color:#DCE9E3;font-family:var(--font-serif);
}
.prose code{padding:2px 6px;border-radius:6px;background:rgba(53,242,197,.12);color:#B8FFEE;font-family:var(--font-mono);font-size:.92em}
.prose table{width:100%;border-collapse:collapse;font-size:14px;line-height:22px}
.prose th,.prose td{padding:10px 12px;border-bottom:1px solid rgba(201,169,106,.24);text-align:left}
.prose th{font-family:var(--font-mono);font-size:12px;letter-spacing:.1em;text-transform:uppercase;color:var(--gold)}

.toc{position:sticky;top:104px;font-size:14px;line-height:22px}
.toc-title{font-family:var(--font-mono);font-size:12px;letter-spacing:.2em;text-transform:uppercase;color:var(--gold);margin-bottom:12px}
.toc-list li+li{margin-top:6px}
.toc-link{
  display:block;padding:6px 10px;border-radius:10px;
  border-left:2px solid transparent;color:var(--mist);text-decoration:none;
  transition:color var(--fast) var(--ease),border-color var(--fast) var(--ease),background-color var(--fast) var(--ease);
}
.toc-link:hover{color:var(--paper);background:rgba(53,242,197,.08)}
.toc-link[aria-current="true"]{color:#B8FFEE;border-left-color:var(--cyan);background:rgba(53,242,197,.1)}

/* 图片容器基础（页面阶段放置占位图） */
.media-frame{
  position:relative;overflow:hidden;border-radius:16px;
  border:1px solid var(--line-gold);
  background:
    radial-gradient(120% 120% at 18% 0%,rgba(53,242,197,.16),transparent 56%),
    linear-gradient(180deg,#0C2A22,#061A15);
}
.media-frame img{display:block;width:100%;height:100%;object-fit:cover}
.media-frame--16x9{aspect-ratio:16/9}
.media-frame--4x3{aspect-ratio:4/3}
.media-frame--1x1{aspect-ratio:1/1}
.media-grid{display:grid;gap:12px;grid-template-columns:repeat(auto-fit,minmax(150px,1fr))}
.media-caption{margin-top:8px;font-size:12px;line-height:18px;color:var(--mist)}

/* 数据状态动效 */
@keyframes pulse-amber{0%{box-shadow:0 0 0 0 rgba(255,159,69,.55)}70%{box-shadow:0 0 0 10px rgba(255,159,69,0)}100%{box-shadow:0 0 0 0 rgba(255,159,69,0)}}
@keyframes flash-cyan{0%,100%{box-shadow:0 0 0 1px rgba(53,242,197,.2)}50%{box-shadow:0 0 0 2px rgba(53,242,197,.8)}}
.pulse-amber{animation:pulse-amber 1.2s var(--ease) 2}
.flash-cyan{animation:flash-cyan 1.2s var(--ease) 2}

/* ---------- 11. 响应式 ---------- */
@media (max-width:1100px){
  .nav-link{padding:9px 10px;font-size:13px}
}
@media (max-width:980px){
  .footer-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
  .footer-brand{grid-column:1/-1}
  .footer-card{grid-column:1/-1}
}
@media (max-width:960px){
  .site-header{padding:10px var(--gutter) 8px}
  .header-inner{padding:9px 10px 9px 13px;border-radius:18px}
  .nav-island{
    position:absolute;left:0;right:0;top:calc(100% + 10px);
    display:none;flex-direction:column;align-items:stretch;gap:0;
    margin:0;padding:12px;
    border-radius:20px;border:1px solid rgba(201,169,106,.3);
    background:linear-gradient(180deg,rgba(10,36,29,.99),rgba(4,18,14,.99));
    box-shadow:0 34px 64px -34px rgba(0,0,0,.98),inset 0 1px 0 rgba(242,232,213,.07);
    max-height:min(68vh,520px);overflow:auto;
  }
  .site-header[data-open] .nav-island{display:flex}
  .nav-list{flex-direction:column;align-items:stretch;gap:2px;width:100%}
  .nav-link{padding:13px 14px;font-size:15px;border-radius:12px}
  .nav-link[aria-current="page"]{border-radius:12px}
  .nav-cta{display:inline-flex;margin-top:10px;width:100%}
  .nav-toggle{display:inline-flex}
  .header-actions{margin-left:auto}
  .to-top{right:12px;bottom:14px}
}
@media (max-width:760px){
  .footer-nav{grid-template-columns:repeat(2,minmax(0,1fr))}
  .colophon-inner{justify-content:flex-start}
  .toc{position:static}
}
@media (max-width:620px){
  body{font-size:15px;line-height:26px}
  .footer-grid{grid-template-columns:1fr;gap:28px}
  .footer-summary{max-width:none}
  .colophon-inner{padding-block:18px;font-size:12px;line-height:18px}
}
@media (max-width:480px){
  .header-cta{display:none}
  .brand-sub{letter-spacing:.12em;font-size:10px}
  .brand-name{font-size:14px}
  .nav-toggle-text{display:none}
  .nav-toggle{padding:9px 11px}
}

/* ---------- 12. 动效偏好 ---------- */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
    scroll-behavior:auto !important;
  }
  .pulse-amber,.flash-cyan{animation:none}
  .scroll-meter-fill{transition:none}
}