/* ==========================================================================
   必赢赛场 — 共享样式表 /assets/site.css
   01 变量 / 02 Reset / 03 中文排版 / 04 布局 / 05 通用组件 / 06 页头 / 07 页脚
   08 响应式 / 09 动效与无障碍
   ========================================================================== */

/* ---------- 01 变量 ---------- */
:root{
  --ink-900:#0A1030;
  --ink-800:#141C4B;
  --cyan:#2BF0D0;
  --orange:#FF6B2C;
  --amber:#FFB020;
  --silver:#C3CBD9;
  --ivory:#F6F8FC;
  --cyan-soft:#A8F7E7;
  --teal-deep:#08282B;
  --slate:#5A668F;

  --bg:var(--ink-900);
  --surface:var(--ink-800);
  --surface-2:rgba(20,28,75,.72);
  --text:var(--ivory);
  --text-body:#D6DCEC;
  --text-dim:var(--silver);
  --text-mute:#8B94B9;
  --line:rgba(90,102,143,.45);
  --line-soft:rgba(90,102,143,.26);
  --line-strong:rgba(195,203,217,.26);
  --focus:var(--cyan);

  --font-sans:"Helvetica Neue",Helvetica,Arial,"PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,sans-serif;
  --font-mono:ui-monospace,SFMono-Regular,Menlo,Consolas,"Courier New",monospace;

  --container:1240px;
  --gutter:clamp(16px,3.6vw,40px);
  --gap:clamp(14px,2.2vw,26px);
  --sec:clamp(32px,6vw,84px);
  --radius:2px;
  --ease:cubic-bezier(.22,.68,.32,1);
  --dur:.2s;
}

/* ---------- 02 Reset ---------- */
*,*::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,pre{margin:0;padding:0}
ul,ol{list-style:none}
img,svg,video,canvas{display:block;max-width:100%}
a{color:inherit;text-decoration:none}
button,input,select,textarea{font:inherit;color:inherit}
button{background:none;border:0;cursor:pointer}
table{border-collapse:collapse;width:100%}
[hidden]{display:none !important}
main{display:block}
#main-content{scroll-margin-top:110px}

/* ---------- 03 中文排版 ---------- */
body{
  min-height:100vh;
  background-color:var(--bg);
  color:var(--text-body);
  font-family:var(--font-sans);
  font-size:clamp(16px,1.02vw,17px);
  line-height:1.95;
  letter-spacing:.01em;
  -webkit-font-smoothing:antialiased;
  background-image:
    radial-gradient(1100px 620px at 84% -8%, rgba(43,240,208,.11), transparent 62%),
    radial-gradient(900px 540px at 0% 6%, rgba(255,107,44,.09), transparent 60%),
    repeating-linear-gradient(0deg, rgba(90,102,143,.12) 0 1px, transparent 1px 84px),
    repeating-linear-gradient(90deg, rgba(90,102,143,.12) 0 1px, transparent 1px 84px);
}
h1,.h1{
  font-size:clamp(38px,7vw,88px);
  font-weight:300;
  line-height:1.02;
  letter-spacing:-.02em;
  color:var(--ivory);
}
h2,.h2{
  font-size:clamp(24px,3.2vw,42px);
  font-weight:300;
  line-height:1.1;
  letter-spacing:-.015em;
  color:var(--ivory);
}
h3,.h3{font-size:clamp(17px,1.6vw,21px);font-weight:600;line-height:1.45;color:var(--ivory)}
h4,.h4{font-size:clamp(15px,1.3vw,17px);font-weight:600;line-height:1.5;color:var(--ivory)}
strong{font-weight:700;color:var(--ivory)}
em{font-style:normal;color:var(--cyan)}
::selection{background:rgba(43,240,208,.28);color:var(--ivory)}
.num,.mono{font-family:var(--font-mono);font-variant-numeric:tabular-nums}

.prose{max-width:74ch;font-size:clamp(16px,1.05vw,17.5px);line-height:1.95;color:var(--text-body)}
.prose > * + *{margin-top:1.1em}
.prose h2{margin-top:2em}
.prose ul{display:grid;gap:.5em;padding-left:1.1em;list-style:none}
.prose ul li{position:relative}
.prose ul li::before{content:"";position:absolute;left:-1.1em;top:.85em;width:6px;height:1px;background:var(--cyan)}
.prose a{border-bottom:1px solid rgba(43,240,208,.5);color:var(--cyan)}

/* ---------- 04 布局 ---------- */
.container{width:100%;max-width:var(--container);margin-inline:auto;padding-inline:var(--gutter)}
.section{padding-block:var(--sec)}
.section--tight{padding-block:clamp(22px,3.4vw,46px)}
.section__head{display:grid;gap:12px;max-width:78ch;margin-bottom:clamp(18px,3vw,34px)}
.section__title{font-size:clamp(24px,3.2vw,42px);font-weight:300;line-height:1.08;letter-spacing:-.015em;color:var(--ivory)}
.section__lede{font-size:clamp(15px,1.3vw,17px);line-height:1.95;color:var(--text-body)}
.page-head{padding-block:clamp(24px,4.5vw,58px)}

.grid{display:grid;gap:var(--gap)}
.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--split{grid-template-columns:minmax(0,1.45fr) minmax(0,.85fr)}
.stack{display:grid;gap:var(--gap)}
.stack--tight{gap:10px}

.rule{height:1px;border:0;background:linear-gradient(90deg,var(--cyan),rgba(43,240,208,.04));margin-block:clamp(20px,3vw,36px)}
.rule--soft{background:var(--line-soft)}

/* ---------- 05 通用组件 ---------- */
.skip-link{
  position:absolute;left:var(--gutter);top:-70px;z-index:200;
  padding:11px 18px;background:var(--cyan);color:#04211E;
  font-size:13px;font-weight:700;letter-spacing:.04em;border-radius:var(--radius);
  transition:top .18s var(--ease);
}
.skip-link:focus{top:10px}

.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;
}

/* 按钮 */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:.5em;
  padding:12px 20px;border:1px solid var(--line-strong);border-radius:var(--radius);
  background:transparent;color:var(--ivory);
  font-size:14px;font-weight:600;letter-spacing:.04em;line-height:1.2;
  white-space:nowrap;cursor:pointer;
  transition:background-color .18s var(--ease),color .18s var(--ease),border-color .18s var(--ease),transform .18s var(--ease);
}
.btn:hover{transform:translateY(-1px)}
.btn:active{transform:translateY(0)}
.btn--signal{background:var(--orange);border-color:var(--orange);color:#180A03}
.btn--signal:hover{background:#FF8250;border-color:#FF8250}
.btn--cyan{background:var(--cyan);border-color:var(--cyan);color:#04211E}
.btn--cyan:hover{background:#63F5DC;border-color:#63F5DC}
.btn--ghost{border-color:var(--line-strong);color:var(--ivory);background:rgba(20,28,75,.5)}
.btn--ghost:hover{border-color:var(--cyan);color:var(--cyan);background:rgba(43,240,208,.08)}
.btn--sm{padding:9px 14px;font-size:13px}
.btn--block{width:100%}

.link-arrow{
  display:inline-flex;align-items:center;gap:8px;
  font-size:14px;font-weight:600;color:var(--cyan);
  transition:gap .18s var(--ease),color .18s var(--ease);
}
.link-arrow::after{content:"→";transition:transform .18s var(--ease)}
.link-arrow:hover{gap:12px;color:var(--cyan-soft)}

/* 索引标签 */
.index-label,.eyebrow{
  display:inline-flex;align-items:center;gap:.55em;
  padding:4px 10px;border:1px solid var(--line-strong);border-radius:999px;
  font-family:var(--font-mono);font-size:11px;letter-spacing:.14em;
  text-transform:uppercase;color:var(--text-dim);background:rgba(10,16,48,.6);
}
.index-label::before,.eyebrow::before{
  content:"";width:6px;height:6px;border-radius:50%;background:var(--cyan);flex:none;
}
.index-label--orange::before,.eyebrow--orange::before{background:var(--orange)}
.index-label--amber::before,.eyebrow--amber::before{background:var(--amber)}

/* 标签 */
.tag{
  display:inline-flex;align-items:center;gap:6px;
  padding:4px 9px;border:1px solid var(--line-strong);border-radius:var(--radius);
  font-family:var(--font-mono);font-size:11.5px;letter-spacing:.08em;color:var(--text-dim);
  transition:color .16s var(--ease),border-color .16s var(--ease),background-color .16s var(--ease);
}
.tag--cyan{background:rgba(43,240,208,.12);border-color:rgba(43,240,208,.45);color:var(--cyan)}
.tag--soft{background:var(--cyan-soft);border-color:var(--cyan-soft);color:#04211E;font-weight:700}
.tag--orange{background:rgba(255,107,44,.14);border-color:rgba(255,107,44,.5);color:#FFB48C}

/* 纸张叠层 */
.paper{
  position:relative;isolation:isolate;
  padding:clamp(16px,2.2vw,26px);
  background:var(--surface-2);
  border:1px solid var(--line-soft);
  border-radius:var(--radius);
}
.paper--stack::after{
  content:"";position:absolute;top:10px;left:10px;right:-10px;bottom:-10px;z-index:-1;
  background:var(--teal-deep);border:1px solid rgba(43,240,208,.18);
}
.paper__head{
  display:flex;align-items:center;justify-content:space-between;gap:12px;
  padding-bottom:12px;margin-bottom:14px;border-bottom:1px solid var(--line-soft);
}

/* 数据卡片 */
.card{
  position:relative;display:flex;flex-direction:column;gap:12px;
  padding:18px 18px 20px;
  background:linear-gradient(160deg,rgba(20,28,75,.92),rgba(10,16,48,.72));
  border:1px solid var(--line-soft);border-left:3px solid var(--cyan);
  border-radius:var(--radius);
  transition:border-color .18s var(--ease),transform .18s var(--ease);
}
.card:hover{border-left-color:var(--orange);transform:translateX(2px)}
.card__top{
  display:flex;align-items:center;justify-content:space-between;gap:12px;
  font-family:var(--font-mono);font-size:11px;letter-spacing:.12em;
  text-transform:uppercase;color:var(--text-mute);
}
.card__title{font-size:clamp(17px,1.5vw,20px);font-weight:600;line-height:1.45;color:var(--ivory)}
.card__meta{font-family:var(--font-mono);font-size:12.5px;color:var(--text-mute);letter-spacing:.04em}
.card__tags{display:flex;flex-wrap:wrap;gap:8px;margin-top:auto}
.card--orange{border-left-color:var(--orange)}
.card--amber{border-left-color:var(--amber)}

/* 统计 */
.stat{display:flex;flex-direction:column;gap:4px}
.stat__num{
  font-family:var(--font-mono);font-variant-numeric:tabular-nums;
  font-size:clamp(26px,3.4vw,44px);font-weight:600;line-height:1;
  letter-spacing:-.01em;color:var(--cyan);
}
.stat__unit{font-family:var(--font-mono);font-size:12px;color:var(--text-mute);margin-left:6px}
.stat__label{font-size:12.5px;letter-spacing:.06em;color:var(--text-mute)}
.stat--orange .stat__num{color:var(--orange)}
.stat--amber .stat__num{color:var(--amber)}
.stat--ivory .stat__num{color:var(--ivory)}
.stat-row{display:flex;flex-wrap:wrap;gap:clamp(18px,3vw,42px)}

.meta-row{
  display:flex;flex-wrap:wrap;gap:10px 22px;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.06em;color:var(--text-mute);
}

/* 筛选 */
.filter-bar{
  display:flex;flex-wrap:wrap;align-items:center;gap:8px;
  padding:10px 0 14px;margin-bottom:clamp(16px,2.4vw,28px);
  border-bottom:1px solid var(--line-soft);
}
.filter-bar__label{
  font-family:var(--font-mono);font-size:11px;letter-spacing:.16em;
  text-transform:uppercase;color:var(--text-mute);margin-right:6px;
}
.filter-btn{
  padding:7px 14px;border:1px solid var(--line-strong);border-radius:var(--radius);
  font-size:13px;letter-spacing:.04em;color:var(--silver);
  transition:color .16s var(--ease),background-color .16s var(--ease),border-color .16s var(--ease);
}
.filter-btn:hover{color:var(--ivory);border-color:var(--cyan)}
.filter-btn[aria-pressed="true"],.filter-btn.is-active{
  background:var(--cyan);border-color:var(--cyan);color:#04211E;font-weight:700;
}
.filter-count{margin-left:auto;font-family:var(--font-mono);font-size:12px;color:var(--amber)}
[data-filter-item]{transition:opacity .2s var(--ease)}

/* 折叠块 */
.fold{
  border:1px solid var(--line-soft);border-radius:var(--radius);
  background:rgba(20,28,75,.55);
}
.fold + .fold{margin-top:10px}
.fold__summary{
  display:flex;align-items:center;gap:12px;
  padding:15px 18px;cursor:pointer;list-style:none;
  font-size:16px;font-weight:600;color:var(--ivory);
  transition:color .16s var(--ease),background-color .16s var(--ease);
}
.fold__summary::-webkit-details-marker{display:none}
.fold__summary::after{
  content:"";margin-left:auto;width:9px;height:9px;flex:none;
  border-right:2px solid var(--cyan);border-bottom:2px solid var(--cyan);
  transform:rotate(45deg);
  transition:transform .2s var(--ease);
}
.fold[open] .fold__summary::after{transform:rotate(-135deg)}
.fold__summary:hover{color:var(--cyan);background:rgba(43,240,208,.06)}
.fold__body{padding:0 18px 20px;font-size:15.5px;line-height:1.95;color:var(--text-body)}
.fold__body > * + *{margin-top:12px}

/* 提示块 */
.callout{
  padding:16px 18px;border:1px solid rgba(43,240,208,.3);border-radius:var(--radius);
  background:linear-gradient(180deg,rgba(43,240,208,.09),rgba(20,28,75,.5));
  font-size:15px;line-height:1.9;color:var(--text-body);
}
.callout--orange{
  border-color:rgba(255,107,44,.38);
  background:linear-gradient(180deg,rgba(255,107,44,.1),rgba(20,28,75,.5));
}
.callout__title{
  display:block;margin-bottom:8px;
  font-family:var(--font-mono);font-size:11.5px;letter-spacing:.14em;
  text-transform:uppercase;color:var(--cyan);
}
.callout--orange .callout__title{color:var(--orange)}

/* 面包屑 */
.breadcrumb{
  padding-block:14px;
  font-family:var(--font-mono);font-size:12.5px;letter-spacing:.06em;color:var(--text-mute);
}
.breadcrumb__list{display:flex;flex-wrap:wrap;align-items:center;gap:8px}
.breadcrumb__item{display:inline-flex;align-items:center;gap:8px}
.breadcrumb__item + .breadcrumb__item::before{content:"/";color:var(--slate)}
.breadcrumb__link{color:var(--silver);transition:color .16s var(--ease)}
.breadcrumb__link:hover{color:var(--cyan)}
.breadcrumb__current{color:var(--ivory)}

/* 图片容器（页面阶段放占位图） */
.shot{
  display:grid;grid-template-rows:1fr auto;
  border:1px solid var(--line-soft);border-radius:var(--radius);
  background:linear-gradient(150deg,var(--ink-800),var(--teal-deep));
  overflow:hidden;
}
.shot--16x9{aspect-ratio:16/9}
.shot--4x3{aspect-ratio:4/3}
.shot--1x1{aspect-ratio:1/1}
.shot--tall{aspect-ratio:3/4}
.shot--wide{aspect-ratio:21/9}
.shot__frame{position:relative;min-height:0;overflow:hidden}
.shot__frame::after{
  content:"";position:absolute;inset:0;pointer-events:none;opacity:.5;
  background-image:
    linear-gradient(90deg,rgba(43,240,208,.16) 1px,transparent 1px),
    linear-gradient(0deg,rgba(43,240,208,.1) 1px,transparent 1px);
  background-size:48px 48px;
}
.shot__media{width:100%;height:100%;object-fit:cover;filter:saturate(.95) contrast(1.05)}
.shot__caption{
  padding:10px 12px;border-top:1px solid var(--line-soft);
  background:rgba(10,16,48,.65);
  font-family:var(--font-mono);font-size:11px;letter-spacing:.1em;color:var(--text-mute);
}

/* ---------- 06 页头 ---------- */
.site-header{
  position:sticky;top:0;z-index:90;
  background:linear-gradient(180deg,rgba(10,16,48,.97),rgba(10,16,48,.9));
  border-bottom:1px solid var(--line);
  -webkit-backdrop-filter:blur(10px);
  backdrop-filter:blur(10px);
}
.site-header::before{
  content:"";position:absolute;left:0;right:0;top:0;height:2px;
  background:linear-gradient(90deg,var(--cyan),rgba(43,240,208,.15) 46%,transparent 78%);
}
.site-header[data-scrolled]{box-shadow:0 18px 44px rgba(3,6,22,.55)}

.header-inner{
  display:grid;grid-template-columns:auto minmax(0,1fr) auto;
  align-items:center;gap:clamp(10px,2vw,26px);
  min-height:74px;padding-block:10px;
}

.brand{display:inline-flex;align-items:center;gap:10px;padding:4px 0;flex:none}
.brand__mark{
  width:11px;height:11px;flex:none;background:var(--cyan);
  transform:rotate(45deg);
  box-shadow:0 0 0 4px rgba(43,240,208,.16),0 0 16px rgba(43,240,208,.5);
}
.brand__text{display:flex;flex-direction:column;line-height:1.2}
.brand__name{font-size:17px;font-weight:700;letter-spacing:.08em;color:var(--ivory)}
.brand__sub{
  font-family:var(--font-mono);font-size:10px;letter-spacing:.16em;
  text-transform:uppercase;color:var(--text-mute);white-space:nowrap;
}
.brand--footer .brand__name{font-size:20px}
.brand--footer .brand__sub{color:var(--cyan)}

.site-nav{justify-self:center;min-width:0}
.site-nav__list{display:flex;align-items:center;gap:2px;flex-wrap:nowrap}
.site-nav__item{display:block}
.site-nav__link{
  position:relative;display:inline-flex;align-items:center;gap:6px;
  padding:9px 11px;border-radius:var(--radius);
  font-size:14px;color:var(--silver);white-space:nowrap;
  transition:color .18s var(--ease),background-color .18s var(--ease);
}
.site-nav__index{
  font-family:var(--font-mono);font-size:10px;letter-spacing:.06em;
  color:var(--text-mute);transition:color .18s var(--ease);
}
.site-nav__link::before{
  content:"";width:0;height:6px;border-radius:50%;background:var(--cyan);
  transition:width .2s var(--ease);
}
.site-nav__link::after{
  content:"";position:absolute;left:11px;right:11px;bottom:3px;height:2px;
  background:var(--cyan);transform:scaleX(0);transform-origin:left;
  transition:transform .2s var(--ease);
}
.site-nav__link:hover{color:var(--ivory);background:rgba(43,240,208,.07)}
.site-nav__link:hover .site-nav__index{color:var(--cyan)}
.site-nav__link[aria-current="page"]{color:var(--ivory)}
.site-nav__link[aria-current="page"] .site-nav__index{color:var(--cyan)}
.site-nav__link[aria-current="page"]::before{width:6px;box-shadow:0 0 10px rgba(43,240,208,.85)}
.site-nav__link[aria-current="page"]::after{transform:scaleX(1)}
.site-nav__cta{display:none;gap:10px;margin-top:16px}

.header-actions{display:flex;align-items:center;gap:10px;justify-self:end}
.header-actions__primary,.header-actions__ghost{white-space:nowrap}

.clock{
  display:flex;flex-direction:column;align-items:flex-end;gap:1px;
  padding-right:12px;margin-right:2px;border-right:1px solid var(--line);
}
.clock__label{font-family:var(--font-mono);font-size:9.5px;letter-spacing:.18em;color:var(--text-mute)}
.clock__time{
  font-family:var(--font-mono);font-variant-numeric:tabular-nums;
  font-size:15px;font-weight:600;letter-spacing:.06em;color:var(--amber);line-height:1.2;
}

.nav-toggle{
  display:none;align-items:center;gap:9px;
  padding:9px 12px;border:1px solid var(--line-strong);border-radius:var(--radius);
  color:var(--ivory);
}
.nav-toggle:hover{border-color:var(--cyan);color:var(--cyan)}
.nav-toggle__bars{position:relative;display:block;width:16px;height:2px;background:var(--cyan);flex:none}
.nav-toggle__bars::before,.nav-toggle__bars::after{
  content:"";position:absolute;left:0;width:16px;height:2px;background:var(--cyan);
  transition:transform .2s var(--ease);
}
.nav-toggle__bars::before{top:-5px}
.nav-toggle__bars::after{top:5px}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars{background:transparent}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::before{transform:translateY(5px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::after{transform:translateY(-5px) rotate(-45deg)}
.nav-toggle__label{font-size:12px;letter-spacing:.12em}

.scroll-progress{
  position:absolute;left:0;right:0;bottom:-1px;height:2px;overflow:hidden;
}
.scroll-progress__bar{
  display:block;height:100%;width:100%;
  background:linear-gradient(90deg,var(--cyan),var(--amber) 62%,var(--orange));
  transform:scaleX(0);transform-origin:left;
  transition:transform .12s linear;
}

/* ---------- 07 页脚 ---------- */
.site-footer{
  position:relative;overflow:hidden;
  margin-top:clamp(48px,8vw,110px);
  background:linear-gradient(180deg,rgba(20,28,75,.92),rgba(10,16,48,1));
  border-top:1px solid var(--line-strong);
  color:var(--text-dim);
}
.site-footer::before{
  content:"";position:absolute;inset:0;pointer-events:none;opacity:.55;
  background-image:
    repeating-linear-gradient(90deg,rgba(90,102,143,.16) 0 1px,transparent 1px 96px),
    radial-gradient(760px 320px at 88% 104%, rgba(255,107,44,.12), transparent 66%);
}
.footer-wordmark{
  position:relative;max-width:var(--container);margin-inline:auto;
  padding:clamp(26px,5vw,56px) var(--gutter) 0;
  overflow:hidden;
}
.footer-wordmark__text{
  display:block;line-height:.86;font-weight:200;letter-spacing:.03em;
  font-size:clamp(52px,15vw,190px);white-space:nowrap;
  color:rgba(43,240,208,.09);
  -webkit-text-stroke:1px rgba(43,240,208,.32);
}
.footer-wordmark__rule{
  display:block;height:1px;margin-top:clamp(14px,2.5vw,26px);
  background:linear-gradient(90deg,var(--cyan),rgba(43,240,208,.05) 66%,transparent);
}
.footer-inner{
  position:relative;
  display:grid;grid-template-columns:minmax(0,1.35fr) minmax(0,2.65fr);
  gap:clamp(24px,4vw,54px);
  padding-block:clamp(28px,5vw,54px);
}
.footer-brand{display:grid;gap:16px;align-content:start}
.footer-note{
  max-width:44ch;font-size:13.5px;line-height:1.9;color:var(--text-dim);
  border-left:2px solid rgba(43,240,208,.35);padding-left:12px;
}
.footer-note--dim{color:var(--text-mute);border-left-color:var(--line)}
.footer-nav{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:clamp(16px,2.5vw,30px)}
.footer-col__title{
  margin-bottom:14px;
  font-family:var(--font-mono);font-size:11px;font-weight:600;
  letter-spacing:.2em;text-transform:uppercase;color:var(--cyan);
}
.footer-col__list{display:grid;gap:9px}
.footer-link{
  display:inline-flex;align-items:center;gap:8px;
  font-size:14.5px;color:var(--silver);
  transition:color .18s var(--ease);
}
.footer-link::before{
  content:"";width:12px;height:1px;flex:none;background:var(--slate);
  transition:width .18s var(--ease),background-color .18s var(--ease);
}
.footer-link:hover{color:var(--ivory)}
.footer-link:hover::before{width:22px;background:var(--orange)}
.footer-legal{position:relative;border-top:1px solid var(--line);background:rgba(8,40,43,.4)}
.footer-legal__inner{
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;
  gap:10px 26px;padding-block:18px;
  font-size:12.5px;color:var(--text-mute);
}
.footer-legal__item{display:inline-flex;align-items:center;gap:8px}
.footer-legal__item--mono{font-family:var(--font-mono);letter-spacing:.12em;color:var(--amber)}

/* ---------- 08 响应式 ---------- */
@media (max-width:1080px){
  .header-inner{grid-template-columns:auto minmax(0,1fr);gap:12px}
  .nav-toggle{display:inline-flex}
  .site-nav{
    position:absolute;left:0;right:0;top:100%;
    display:block;
    padding:14px var(--gutter) 22px;
    background:linear-gradient(180deg,#0C1440,#0A1030);
    border-bottom:1px solid var(--line);
    box-shadow:0 28px 64px rgba(2,5,20,.62);
    opacity:0;visibility:hidden;transform:translateY(-10px);
    transition:opacity .2s var(--ease),transform .2s var(--ease),visibility .2s var(--ease);
    max-height:calc(100vh - 80px);overflow-y:auto;
  }
  .site-nav[data-open]{opacity:1;visibility:visible;transform:translateY(0)}
  .site-nav__list{flex-direction:column;align-items:stretch;gap:0}
  .site-nav__link{
    justify-content:flex-start;
    padding:13px 8px;font-size:16px;border-bottom:1px solid var(--line-soft);
    border-radius:0;
  }
  .site-nav__link::after{left:8px;right:auto;bottom:6px;width:0;background:var(--orange);height:2px}
  .site-nav__link[aria-current="page"]::after{left:8px;right:8px;width:auto}
  .site-nav__cta{display:grid;grid-template-columns:1fr 1fr;gap:10px}
  html[data-nav-open]{overflow:hidden}
  .grid--3,.grid--4{grid-template-columns:repeat(2,minmax(0,1fr))}
  .grid--split{grid-template-columns:minmax(0,1fr)}
}
@media (max-width:980px){
  .footer-inner{grid-template-columns:minmax(0,1fr)}
  .footer-note{max-width:60ch}
}
@media (max-width:900px){
  .grid--2,.grid--3,.grid--4{grid-template-columns:minmax(0,1fr)}
}
@media (max-width:720px){
  .header-inner{min-height:64px}
  .header-actions__ghost{display:none}
  .clock{padding-right:10px}
  .clock__time{font-size:14px}
  .footer-nav{grid-template-columns:repeat(2,minmax(0,1fr));gap:22px}
  .footer-legal__inner{justify-content:flex-start}
}
@media (max-width:520px){
  .brand__sub{display:none}
  .clock__label{display:none}
  .clock{padding-right:9px}
  .nav-toggle__label{display:none}
  .site-nav__cta{grid-template-columns:1fr}
  .footer-nav{grid-template-columns:minmax(0,1fr)}
  .btn{padding:11px 16px}
  .btn--sm{padding:9px 12px;font-size:12.5px}
}

/* ---------- 09 动效与无障碍 ---------- */
:focus-visible{outline:2px solid var(--focus);outline-offset:3px;border-radius:1px}
.btn:focus-visible,.filter-btn:focus-visible,.nav-toggle:focus-visible{outline-offset:3px}

.has-js [data-reveal]{
  opacity:0;transform:translateY(16px);
  transition:opacity .5s var(--ease),transform .5s var(--ease);
}
.has-js [data-reveal].is-visible{opacity:1;transform:none}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  .has-js [data-reveal]{transform:none;transition:opacity .2s linear}
  .site-nav,.site-nav[data-open]{transform:none}
  .site-nav__link::after,
  .nav-toggle__bars::before,
  .nav-toggle__bars::after,
  .scroll-progress__bar,
  .card,
  .btn,
  .footer-link::before{transition:none}
  .btn:hover{transform:none}
  .card:hover{transform:none}
}