/* ============================================================
   华体网登录口 · 共享样式表 /assets/site.css
   夜间训练场数据看板：深墨蓝底 + 数据网格 + 荧光青路径
   ============================================================ */

/* ---------- 1. 设计令牌 ---------- */
:root{
  --ink-900:#08131F;
  --ink-800:#0F2233;
  --ink-750:#0C1E2E;
  --ink-700:#132B41;
  --line:#1B3A54;
  --line-soft:rgba(27,58,84,.62);
  --cyan:#35E6E0;
  --cyan-soft:#B4F7F4;
  --orange:#FF7A32;
  --violet:#8C6CFF;
  --green:#4FD68F;
  --text:#E9F2F8;
  --muted:#9BB2C4;

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

  --shell:1440px;
  --pad:clamp(18px,4vw,44px);
  --radius:2px;
  --dur:240ms;
  --dur-slow:320ms;
  --ease:cubic-bezier(.22,.61,.36,1);
  --shadow-lg:0 28px 60px rgba(2,8,15,.55);
  --glow-cyan:0 0 0 1px rgba(53,230,224,.38),0 14px 34px rgba(53,230,224,.14);
}

/* ---------- 2. 重置与基础 ---------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body,h1,h2,h3,h4,h5,p,ul,ol,li,figure,blockquote,dl,dd{margin:0;padding:0}
ul,ol{list-style:none}
img,svg,video{display:block;max-width:100%}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
a{color:inherit;text-decoration:none}
table{border-collapse:collapse;width:100%}
:focus-visible{outline:2px solid var(--cyan);outline-offset:3px;border-radius:2px}

body{
  min-height:100vh;
  font-family:var(--font-body);
  font-size:16.5px;
  font-weight:400;
  line-height:1.75;
  color:var(--text);
  background-color:var(--ink-900);
  background-image:
    radial-gradient(900px 520px at 10% -10%,rgba(53,230,224,.13),transparent 62%),
    radial-gradient(820px 500px at 96% 2%,rgba(140,108,255,.15),transparent 64%),
    radial-gradient(700px 420px at 50% 108%,rgba(255,122,50,.07),transparent 66%),
    repeating-linear-gradient(to right,rgba(27,58,84,.42) 0 1px,transparent 1px 84px),
    repeating-linear-gradient(to bottom,rgba(27,58,84,.34) 0 1px,transparent 1px 84px),
    linear-gradient(180deg,#08131F 0%,#0A1826 48%,#070F1A 100%);
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
  overflow-wrap:break-word;
}

h1,h2,h3,h4{font-family:var(--font-head);font-weight:800;letter-spacing:-.02em;line-height:1.2}
p{max-width:74ch}

/* ---------- 3. 布局骨架 ---------- */
.shell{
  width:100%;
  max-width:var(--shell);
  margin-inline:auto;
  padding-inline:var(--pad);
}
.page-shell{
  display:grid;
  grid-template-columns:280px minmax(0,1fr);
  gap:clamp(24px,3.4vw,56px);
  width:100%;
  max-width:var(--shell);
  margin-inline:auto;
  padding:clamp(28px,4vw,56px) var(--pad) clamp(64px,8vw,112px);
}
.section{margin-bottom:clamp(48px,6vw,88px)}
.section:last-child{margin-bottom:0}
.section__head{
  display:flex;
  flex-wrap:wrap;
  align-items:flex-end;
  justify-content:space-between;
  gap:16px;
  padding-bottom:18px;
  margin-bottom:clamp(20px,2.6vw,34px);
  border-bottom:1px solid var(--line);
}
.section__eyebrow{
  font-family:var(--font-mono);
  font-size:11.5px;
  letter-spacing:.16em;
  text-transform:uppercase;
  color:var(--cyan);
}
.section__title{font-size:clamp(24px,3.1vw,36px);font-weight:900;letter-spacing:-.025em}
.section__note{font-size:13.5px;color:var(--muted);max-width:44ch;line-height:1.65}

.chapter{display:grid;grid-template-columns:minmax(66px,88px) minmax(0,1fr);gap:clamp(14px,2vw,28px);align-items:start}
.chapter__num{
  font-family:var(--font-mono);
  font-weight:500;
  font-size:clamp(38px,5.2vw,56px);
  line-height:.92;
  letter-spacing:-.04em;
  color:rgba(53,230,224,.16);
  -webkit-text-stroke:1px rgba(53,230,224,.85);
}
@supports not (-webkit-text-stroke:1px red){
  .chapter__num{color:var(--cyan)}
}
.chapter__body{min-width:0}

.stack{display:flex;flex-direction:column;gap:clamp(14px,1.8vw,22px)}
.row{display:flex;flex-wrap:wrap;gap:12px;align-items:center}

.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))}

/* ---------- 4. 排版工具 ---------- */
.lead{font-size:clamp(17px,1.9vw,20px);line-height:1.72;color:#D6E5EF;max-width:62ch}
.prose p{margin-bottom:1.1em}
.prose h2{font-size:clamp(21px,2.3vw,26px);margin:1.6em 0 .6em}
.prose h3{font-size:19px;margin:1.4em 0 .5em;color:var(--cyan-soft)}
.prose ul{margin:0 0 1.2em;padding-left:0}
.prose ul li{position:relative;padding-left:20px;margin-bottom:.5em}
.prose ul li::before{
  content:"";position:absolute;left:2px;top:.72em;
  width:8px;height:1px;background:var(--cyan);
}
.mono{font-family:var(--font-mono);font-weight:500;letter-spacing:.02em;font-variant-numeric:tabular-nums}
.muted{color:var(--muted);font-size:14px}
.hairline{height:1px;border:0;background:linear-gradient(90deg,var(--cyan),rgba(140,108,255,.5) 42%,transparent)}

/* ---------- 5. 按钮 / 标签 / 状态点 ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:9px;
  padding:13px 24px;border:1px solid transparent;border-radius:var(--radius);
  font-size:15px;font-weight:700;letter-spacing:.01em;line-height:1.2;
  transition:transform var(--dur) var(--ease),box-shadow var(--dur) var(--ease),
             background-color var(--dur) var(--ease),color var(--dur) var(--ease),
             border-color var(--dur) var(--ease);
}
.btn--primary{
  background:linear-gradient(135deg,var(--cyan) 0%,#22C9DE 52%,var(--violet) 100%);
  color:#04161C;
}
.btn--primary:hover,.btn--primary:focus-visible{transform:translateY(-1px);box-shadow:var(--glow-cyan)}
.btn--ghost{
  border-color:var(--line);
  background:rgba(15,34,51,.6);
  color:var(--text);
}
.btn--ghost:hover,.btn--ghost:focus-visible{border-color:var(--cyan);color:var(--cyan-soft)}
.btn--sm{padding:9px 16px;font-size:13.5px}

.tag{
  display:inline-flex;align-items:center;gap:6px;
  padding:4px 9px;border:1px solid var(--line);border-radius:var(--radius);
  font-family:var(--font-mono);font-size:11.5px;letter-spacing:.05em;
  color:var(--muted);background:rgba(8,19,31,.62);white-space:nowrap;
}
.tag--cyan{border-color:rgba(53,230,224,.42);color:var(--cyan-soft);background:rgba(53,230,224,.08)}
.tag--orange{border-color:rgba(255,122,50,.45);color:#FFB48A;background:rgba(255,122,50,.09)}
.tag--violet{border-color:rgba(140,108,255,.48);color:#C6B6FF;background:rgba(140,108,255,.1)}

.dot{display:inline-block;width:7px;height:7px;border-radius:50%;background:var(--muted);flex:0 0 auto}
.dot--live{background:var(--orange);box-shadow:0 0 0 0 rgba(255,122,50,.6);animation:pulse 2.6s var(--ease) infinite}
.dot--ok{background:var(--green)}
.dot--cyan{background:var(--cyan)}

@keyframes pulse{
  0%{box-shadow:0 0 0 0 rgba(255,122,50,.55)}
  70%{box-shadow:0 0 0 7px rgba(255,122,50,0)}
  100%{box-shadow:0 0 0 0 rgba(255,122,50,0)}
}

/* ---------- 6. 卡片（纸张叠层 + 印刷边框 + 角标） ---------- */
.card{
  position:relative;
  display:flex;flex-direction:column;
  border:1px solid var(--line);border-radius:var(--radius);
  background:linear-gradient(158deg,rgba(17,38,56,.96) 0%,rgba(9,22,35,.94) 100%);
  padding:clamp(18px,2vw,26px);
  transition:border-color var(--dur) var(--ease),transform var(--dur) var(--ease),box-shadow var(--dur) var(--ease);
}
.card--stack{box-shadow:10px 10px 0 -1px rgba(11,26,41,1),11px 11px 0 0 rgba(27,58,84,.9)}
.card--link:hover,.card--link:focus-visible{
  border-color:rgba(53,230,224,.55);
  transform:translateY(-3px);
  box-shadow:0 22px 44px rgba(2,8,15,.5);
}
.card__tag{
  position:absolute;top:-1px;right:-1px;
  padding:5px 11px;
  border-left:1px solid var(--line);border-bottom:1px solid var(--line);
  border-radius:0 var(--radius) 0 var(--radius);
  font-family:var(--font-mono);font-size:11px;letter-spacing:.06em;
  color:var(--cyan-soft);background:rgba(53,230,224,.09);
}
.card__title{font-size:clamp(18px,2vw,22px);font-weight:800;line-height:1.35;margin-bottom:10px}
.card__text{font-size:15px;color:#C7D8E5;line-height:1.72}
.card__meta{
  display:flex;flex-wrap:wrap;align-items:center;gap:10px;
  margin-top:auto;padding-top:16px;
  border-top:1px dashed var(--line-soft);
  font-family:var(--font-mono);font-size:12px;letter-spacing:.04em;color:var(--muted);
}
.card__body{display:flex;flex-direction:column;gap:12px;flex:1}

/* ---------- 7. 标签页 / 分段切换 ---------- */
.tabs{width:100%}
.tabs__list{
  display:flex;flex-wrap:wrap;gap:6px;
  border-bottom:1px solid var(--line);
}
.tabs__tab{
  position:relative;
  padding:11px 18px;
  border:1px solid transparent;border-bottom:2px solid transparent;
  border-radius:var(--radius) var(--radius) 0 0;
  font-size:14.5px;font-weight:600;color:var(--muted);
  transition:color var(--dur) var(--ease),background-color var(--dur) var(--ease),border-color var(--dur) var(--ease);
}
.tabs__tab:hover{color:var(--text)}
.tabs__tab[aria-selected="true"],.tabs__tab.is-active{
  color:var(--cyan);
  border-color:var(--line);
  border-bottom-color:var(--cyan);
  background:linear-gradient(180deg,rgba(53,230,224,.12),rgba(53,230,224,0));
}
.tabs__panel{padding-top:24px;animation:fadeIn var(--dur-slow) var(--ease)}
.tabs__panel[hidden]{display:none}
@keyframes fadeIn{from{opacity:0;transform:translateY(6px)}to{opacity:1;transform:none}}

/* ---------- 8. 数据表 / 步骤 / 提示块 ---------- */
.table-wrap{
  overflow-x:auto;
  border:1px solid var(--line);border-radius:var(--radius);
  background:rgba(15,34,51,.55);
}
.data-table{min-width:640px;font-size:14.5px}
.data-table th,.data-table td{
  padding:13px 16px;text-align:left;
  border-bottom:1px solid var(--line-soft);
  vertical-align:top;
}
.data-table thead th{
  position:sticky;top:0;z-index:2;
  background:var(--ink-750);
  font-family:var(--font-mono);font-size:12px;font-weight:500;
  letter-spacing:.08em;color:var(--cyan-soft);white-space:nowrap;
}
.data-table tbody tr:hover{background:rgba(53,230,224,.05)}
.data-table tbody tr:last-child td{border-bottom:0}

.step-list{display:grid;gap:12px;counter-reset:step}
.step{
  display:grid;grid-template-columns:34px minmax(0,1fr);gap:14px;align-items:start;
  padding:14px 16px;border:1px solid var(--line-soft);border-radius:var(--radius);
  background:rgba(15,34,51,.45);
}
.step__num{
  font-family:var(--font-mono);font-size:13px;font-weight:500;
  color:var(--ink-900);background:var(--cyan);
  width:26px;height:26px;border-radius:50%;
  display:grid;place-items:center;
}

.callout{
  padding:18px 20px;
  border:1px solid var(--line);border-left:3px solid var(--cyan);
  border-radius:var(--radius);
  background:linear-gradient(90deg,rgba(53,230,224,.09),rgba(53,230,224,0) 72%);
  font-size:15px;color:#D3E3EE;
}

/* ---------- 9. 图片容器基础规则 ---------- */
.media-frame{
  position:relative;
  width:100%;
  aspect-ratio:16/9;
  overflow:hidden;
  border:1px solid var(--line);
  border-radius:var(--radius);
  background:
    radial-gradient(420px 220px at 18% 12%,rgba(53,230,224,.16),transparent 66%),
    radial-gradient(360px 220px at 88% 92%,rgba(140,108,255,.18),transparent 68%),
    repeating-linear-gradient(to right,rgba(27,58,84,.5) 0 1px,transparent 1px 40px),
    repeating-linear-gradient(to bottom,rgba(27,58,84,.42) 0 1px,transparent 1px 40px),
    linear-gradient(150deg,#0F2233,#08131F);
}
.media-frame--square{aspect-ratio:1/1}
.media-frame--tall{aspect-ratio:4/5}
.media-frame--wide{aspect-ratio:21/9}
.media-frame__inner{position:absolute;inset:0}
.media-frame__inner img{width:100%;height:100%;object-fit:cover}
.media-frame__caption{
  position:absolute;left:0;right:0;bottom:0;
  padding:26px 16px 12px;
  font-family:var(--font-mono);font-size:11.5px;letter-spacing:.04em;
  color:var(--cyan-soft);
  background:linear-gradient(180deg,rgba(8,19,31,0),rgba(8,19,31,.88));
}

/* ---------- 10. 面包屑 / 侧栏 ---------- */
.breadcrumb{
  display:flex;flex-wrap:wrap;align-items:center;gap:9px;
  font-family:var(--font-mono);font-size:12.5px;letter-spacing:.04em;
  color:var(--muted);margin-bottom:22px;
}
.breadcrumb a{transition:color var(--dur) var(--ease)}
.breadcrumb a:hover,.breadcrumb a:focus-visible{color:var(--cyan)}
.breadcrumb__sep{opacity:.5}

.sidebar{position:sticky;top:104px;align-self:start;display:flex;flex-direction:column;gap:clamp(18px,2.2vw,28px)}
.sidebar__block{
  border:1px solid var(--line);border-radius:var(--radius);
  background:rgba(15,34,51,.55);
  padding:18px;
}
.sidebar__title{
  font-family:var(--font-mono);font-size:11.5px;font-weight:500;
  letter-spacing:.16em;text-transform:uppercase;color:var(--cyan);
  padding-bottom:12px;margin-bottom:12px;
  border-bottom:1px solid var(--line-soft);
}
.anchor-list{display:flex;flex-direction:column;gap:2px}
.anchor-link{
  display:flex;gap:12px;align-items:baseline;
  padding:9px 10px;border-radius:var(--radius);
  font-size:14.5px;color:#C7D8E5;
  transition:background-color var(--dur) var(--ease),color var(--dur) var(--ease);
}
.anchor-link::before{
  content:attr(data-index);
  font-family:var(--font-mono);font-size:11.5px;color:var(--muted);
}
.anchor-link:hover,.anchor-link:focus-visible{background:rgba(53,230,224,.1);color:var(--cyan-soft)}

/* ---------- 11. 头部 ---------- */
.site-header{position:relative;z-index:60}

.skip-link{
  position:absolute;left:var(--pad);top:-72px;z-index:120;
  padding:10px 18px;border-radius:var(--radius);
  background:var(--cyan);color:#04161C;font-weight:700;font-size:14px;
  transition:top var(--dur) var(--ease);
}
.skip-link:focus{top:12px}

.scroll-progress{
  position:fixed;top:0;left:0;right:0;height:3px;z-index:110;
  background:rgba(27,58,84,.5);pointer-events:none;
}
.scroll-progress__bar{
  display:block;height:100%;width:100%;
  transform:scaleX(0);transform-origin:0 50%;
  background:linear-gradient(90deg,var(--cyan),var(--violet) 48%,var(--orange));
  transition:transform 120ms linear;
}

.brandbar{
  border-bottom:1px solid var(--line-soft);
  background:linear-gradient(180deg,rgba(8,19,31,.97),rgba(8,19,31,.82));
}
.brandbar__inner{
  display:flex;align-items:center;justify-content:space-between;gap:24px;
  padding-top:14px;padding-bottom:14px;
}
.brand{display:flex;align-items:center;gap:13px;min-width:0}
.brand__mark{
  position:relative;flex:0 0 38px;width:38px;height:38px;
  display:grid;place-items:center;
  background:linear-gradient(135deg,var(--cyan),var(--violet));
  clip-path:polygon(0 0,100% 0,100% 68%,68% 100%,0 100%);
}
.brand__mark-core{
  width:13px;height:13px;background:var(--ink-900);
  clip-path:polygon(0 0,100% 0,100% 66%,66% 100%,0 100%);
}
.brand__text{min-width:0}
.brand__name{
  display:block;
  font-family:var(--font-head);font-weight:900;letter-spacing:-.02em;
  font-size:clamp(17px,1.8vw,21px);line-height:1.24;white-space:nowrap;
}
.brand__sub{
  display:block;
  font-family:var(--font-mono);font-size:11.5px;letter-spacing:.08em;
  color:var(--muted);line-height:1.5;
}
.utilbar{display:flex;flex-wrap:wrap;gap:8px;align-items:center}
.util-chip{
  display:inline-flex;align-items:center;gap:7px;
  padding:5px 11px;border:1px solid var(--line);border-radius:var(--radius);
  font-family:var(--font-mono);font-size:11.5px;letter-spacing:.05em;
  color:var(--muted);background:rgba(15,34,51,.5);white-space:nowrap;
}

.navwrap{
  position:sticky;top:0;z-index:70;
  border-bottom:1px solid var(--line);
  background:linear-gradient(180deg,rgba(15,34,51,.96),rgba(11,26,42,.94));
  backdrop-filter:blur(8px);
}
.navwrap__inner{
  position:relative;
  display:flex;align-items:center;gap:14px;
  padding-top:8px;padding-bottom:8px;
}
.nav{flex:1 1 auto;min-width:0}
.nav__list{display:flex;align-items:center;gap:2px}
.nav__link{
  position:relative;display:inline-block;
  padding:12px 15px;
  font-size:15px;font-weight:600;letter-spacing:.01em;color:#CBDDE8;
  transition:color var(--dur) var(--ease);
}
.nav__link::after{
  content:"";position:absolute;left:15px;right:15px;bottom:6px;height:2px;
  background:linear-gradient(90deg,var(--cyan),var(--violet));
  transform:scaleX(0);transform-origin:0 50%;
  transition:transform var(--dur) var(--ease);
}
.nav__link:hover,.nav__link:focus-visible{color:var(--cyan-soft)}
.nav__link:hover::after,.nav__link:focus-visible::after{transform:scaleX(1)}
.nav__link[aria-current="page"]{color:var(--cyan)}
.nav__link[aria-current="page"]::after{transform:scaleX(1)}
.nav__link[aria-current="page"]::before{
  content:"";position:absolute;left:15px;top:6px;width:4px;height:4px;
  border-radius:50%;background:var(--orange);
}

.header-cta{margin-left:auto;flex:0 0 auto;white-space:nowrap}

.nav-toggle{
  display:none;align-items:center;gap:9px;
  padding:9px 14px;
  border:1px solid var(--line);border-radius:var(--radius);
  background:rgba(15,34,51,.7);
  font-size:14px;font-weight:600;color:var(--text);
}
.nav-toggle__bars{position:relative;width:18px;height:12px;flex:0 0 auto}
.nav-toggle__bars::before,
.nav-toggle__bars::after{
  content:"";position:absolute;left:0;right:0;height:2px;background:var(--cyan);
  transition:transform var(--dur) var(--ease),opacity var(--dur) var(--ease);
}
.nav-toggle__bars::before{top:0}
.nav-toggle__bars::after{bottom:0}
.nav-toggle.is-open .nav-toggle__bars::before{transform:translateY(5px) rotate(45deg)}
.nav-toggle.is-open .nav-toggle__bars::after{transform:translateY(-5px) rotate(-45deg)}

/* ---------- 12. 页脚 ---------- */
.site-footer{
  position:relative;
  border-top:1px solid var(--line);
  background:linear-gradient(180deg,rgba(8,19,31,.35),rgba(6,14,24,.96) 42%,#050D16 100%);
  color:var(--text);
}
.site-footer::before{
  content:"";position:absolute;inset:0 0 auto 0;height:2px;
  background:linear-gradient(90deg,var(--cyan),var(--violet) 46%,var(--orange));
}
.footer__top{
  display:grid;
  grid-template-columns:minmax(230px,1fr) 2fr;
  gap:clamp(28px,4vw,64px);
  padding-top:clamp(40px,5vw,68px);
  padding-bottom:clamp(26px,3vw,40px);
}
.footer__brandname{
  font-family:var(--font-head);font-weight:900;letter-spacing:-.02em;
  font-size:clamp(19px,2vw,23px);line-height:1.3;margin-bottom:8px;
}
.footer__brandsub{
  font-family:var(--font-mono);font-size:11.5px;letter-spacing:.06em;
  color:var(--muted);margin-bottom:18px;max-width:34ch;line-height:1.7;
}
.footer__meta{display:flex;flex-wrap:wrap;gap:8px}
.footer__cols{
  display:grid;
  grid-template-columns:repeat(3,minmax(0,1fr));
  gap:clamp(18px,2.4vw,36px);
}
.footer__coltitle{
  font-family:var(--font-mono);font-size:11.5px;font-weight:500;
  letter-spacing:.16em;text-transform:uppercase;color:var(--cyan);
  padding-bottom:12px;margin-bottom:12px;
  border-bottom:1px solid var(--line-soft);
}
.footer__list{display:flex;flex-direction:column;gap:9px}
.footer__link{
  display:inline-block;
  font-size:14.5px;color:#C4D6E3;
  transition:color var(--dur) var(--ease),transform var(--dur) var(--ease);
}
.footer__link:hover,.footer__link:focus-visible{color:var(--cyan);transform:translateX(3px)}

.footer__contact{
  display:grid;
  grid-template-columns:repeat(auto-fit,minmax(280px,1fr));
  gap:10px 28px;
  padding-top:clamp(20px,2.4vw,28px);
  padding-bottom:clamp(20px,2.4vw,28px);
  border-top:1px solid var(--line-soft);
  border-bottom:1px solid var(--line-soft);
}
.footer__contact-row{display:flex;align-items:center;gap:12px;flex-wrap:wrap}
.footer__contact-label{
  font-family:var(--font-mono);font-size:11.5px;letter-spacing:.1em;
  color:var(--muted);flex:0 0 auto;
}
.footer__contact-value{font-size:14.5px;color:#D8E7F1}
.footer__copy-btn{
  padding:4px 10px;border:1px solid var(--line);border-radius:var(--radius);
  font-family:var(--font-mono);font-size:11.5px;letter-spacing:.05em;color:var(--muted);
  transition:color var(--dur) var(--ease),border-color var(--dur) var(--ease),background-color var(--dur) var(--ease);
}
.footer__copy-btn:hover,.footer__copy-btn:focus-visible{
  color:var(--cyan);border-color:rgba(53,230,224,.5);background:rgba(53,230,224,.1);
}
.footer__copy-btn.is-done{color:var(--green);border-color:rgba(79,214,143,.5)}

.footer__bottom{
  display:flex;flex-wrap:wrap;align-items:center;gap:14px 26px;
  padding-top:20px;padding-bottom:8px;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.03em;color:var(--muted);
}
.footer__icp{color:var(--cyan-soft)}
.footer__legal{display:flex;flex-wrap:wrap;gap:18px;margin-left:auto}
.footer__legal a{transition:color var(--dur) var(--ease)}
.footer__legal a:hover,.footer__legal a:focus-visible{color:var(--cyan)}
.footer__note{
  padding-bottom:34px;
  font-size:12.5px;line-height:1.75;color:var(--muted);max-width:96ch;
}

/* ---------- 13. 入场显现 ---------- */
html.js [data-reveal]{
  opacity:0;
  transform:translateY(8px);
  transition:opacity var(--dur-slow) var(--ease),transform var(--dur-slow) var(--ease);
}
html.js [data-reveal].is-visible{opacity:1;transform:none}

/* ---------- 14. 响应式 ---------- */
@media (max-width:1180px){
  .grid--4{grid-template-columns:repeat(2,minmax(0,1fr))}
}
@media (max-width:1100px){
  .page-shell{grid-template-columns:minmax(0,1fr)}
  .sidebar{position:static;top:auto}
}
@media (max-width:1024px){
  .nav-toggle{display:inline-flex}
  .nav{
    position:absolute;top:100%;left:0;right:0;
    display:none;
    padding:10px var(--pad) 20px;
    max-height:calc(100vh - 140px);
    overflow-y:auto;
    border-bottom:1px solid var(--line);
    background:linear-gradient(180deg,rgba(10,24,38,.99),rgba(8,19,31,.99));
    box-shadow:0 26px 52px rgba(2,8,15,.6);
  }
  .nav[data-open="true"]{display:block;animation:fadeIn var(--dur) var(--ease)}
  .nav__list{flex-direction:column;align-items:stretch;gap:0}
  .nav__link{
    display:block;padding:14px 4px;font-size:16px;
    border-bottom:1px solid var(--line-soft);
  }
  .nav__link::after{left:4px;right:auto;bottom:8px;width:26px;transform-origin:0 50%}
  .nav__link[aria-current="page"]::before{left:auto;right:2px;top:50%;margin-top:-2px}
  .header-cta{margin-left:auto}
}
@media (max-width:900px){
  .utilbar{display:none}
  .grid--3{grid-template-columns:repeat(2,minmax(0,1fr))}
  .footer__top{grid-template-columns:minmax(0,1fr)}
}
@media (max-width:680px){
  body{font-size:16px}
  .grid--2,.grid--3,.grid--4{grid-template-columns:minmax(0,1fr)}
  .chapter{grid-template-columns:minmax(0,1fr);gap:10px}
  .chapter__num{font-size:34px}
  .footer__cols{grid-template-columns:minmax(0,1fr)}
  .footer__legal{margin-left:0}
  .brand__sub{display:none}
  .header-cta{padding:8px 12px;font-size:13px}
}
@media (max-width:420px){
  .nav-toggle__label{display:none}
  .brand__mark{flex-basis:32px;width:32px;height:32px}
}

/* ---------- 15. 降低动效偏好 ---------- */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
  }
  html.js [data-reveal]{opacity:1;transform:none}
  .scroll-progress__bar{transition:none}
}