/* ============================================================
   OBO体育主站 · 共享层 /assets/site.css
   框景语法：顶部数据条 + 左侧竖向索引 = 页面边框
   ============================================================ */

/* ---------- 1. 变量 ---------- */
:root{
  --deep:#060D18;
  --field:#0E1B2E;
  --frame:#22344F;
  --ink:#EAF1FA;
  --muted:#8FA2BC;
  --cyan:#2CE0C8;
  --orange:#FF6A2B;
  --lime:#B8FF3D;
  --blue:#2F6BFF;
  --paper:#F2F5FA;
  --red:#FF4D6D;

  --rail-w:clamp(132px,11vw,176px);
  --topbar-h:48px;
  --gutter:clamp(18px,4vw,40px);
  --maxw:1180px;
  --ease:cubic-bezier(0.2,0.8,0.2,1);

  --mono:"JetBrains Mono","Roboto Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,"Courier New",monospace;
  --sans:"Source Han Sans SC","Noto Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,sans-serif;
  --display:var(--sans);
}

/* ---------- 2. Reset ---------- */
*,*::before,*::after{box-sizing:border-box}
html{
  -webkit-text-size-adjust:100%;
  scroll-behavior:smooth;
  scroll-padding-top:calc(var(--topbar-h) + 20px);
}
body,h1,h2,h3,h4,h5,p,ul,ol,li,figure,blockquote,dl,dd,dt{margin:0}
ul,ol{padding:0;list-style:none}
img,svg,video{max-width:100%}
button,input,select,textarea{font:inherit;color:inherit}
a{color:inherit}
main{display:block}
table{border-collapse:collapse;width:100%}

/* ---------- 3. 中文排版与页面基底 ---------- */
body{
  padding-top:var(--topbar-h);
  background:
    radial-gradient(1100px 560px at 88% -8%,rgba(47,107,255,.16),transparent 62%),
    radial-gradient(880px 520px at -6% 92%,rgba(44,224,200,.09),transparent 60%),
    var(--deep);
  color:var(--ink);
  font-family:var(--sans);
  font-size:16px;
  line-height:1.75;
  font-weight:400;
  letter-spacing:.01em;
  overflow-x:hidden;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
@media (min-width:960px){body{padding-left:var(--rail-w)}}

h1,h2,h3,h4{font-family:var(--display);font-weight:900;letter-spacing:-.02em;line-height:1.14}
h1{font-size:clamp(2.2rem,6vw,5rem)}
h2{font-size:clamp(1.6rem,3.6vw,2.75rem)}
h3{font-size:clamp(1.15rem,2vw,1.5rem);letter-spacing:-.01em;line-height:1.28}
strong{font-weight:800}
.mono,code,kbd{font-family:var(--mono);font-variant-numeric:tabular-nums}

:focus-visible{outline:2px solid var(--cyan);outline-offset:3px;border-radius:2px}
::selection{background:rgba(44,224,200,.28);color:#fff}

/* ---------- 4. 跳转链接 ---------- */
.skip-link{
  position:fixed;top:10px;left:10px;z-index:130;
  transform:translateY(-180%);
  background:var(--cyan);color:#04121A;font-weight:700;font-size:.9rem;
  padding:10px 16px;text-decoration:none;
  transition:transform .2s var(--ease);
}
.skip-link:focus,.skip-link:focus-visible{transform:translateY(0)}

/* ---------- 5. 阅读进度 ---------- */
.read-progress{
  position:fixed;top:0;left:0;right:0;height:2px;z-index:95;
  background:rgba(34,52,79,.5);pointer-events:none;
}
.read-progress__bar{
  display:block;height:100%;width:100%;
  transform:scaleX(0);transform-origin:0 50%;
  background:linear-gradient(90deg,var(--cyan),var(--lime) 70%,var(--orange));
  transition:transform .12s linear;
}

/* ---------- 6. 头部框架 ---------- */
.site-header{position:fixed;top:0;left:0;right:0;z-index:70}

.topbar{
  position:fixed;top:0;left:0;right:0;z-index:3;
  height:var(--topbar-h);
  background:rgba(6,13,24,.86);
  -webkit-backdrop-filter:blur(16px);
  backdrop-filter:blur(16px);
  border-bottom:1px solid var(--frame);
  transition:background .3s var(--ease),border-color .3s var(--ease);
}
.site-header.is-condensed .topbar{background:rgba(4,10,19,.96);border-bottom-color:#2C4266}

.topbar__inner{
  display:flex;align-items:center;gap:clamp(10px,2vw,26px);
  height:100%;padding-inline:18px;
}

/* 品牌 */
.brand{
  display:inline-flex;align-items:center;gap:10px;
  text-decoration:none;color:var(--ink);white-space:nowrap;
}
.brand__mark{
  font-family:var(--mono);font-weight:700;font-size:1.15rem;letter-spacing:.08em;
  padding-bottom:2px;box-shadow:inset 0 -6px 0 rgba(44,224,200,.22);
}
.brand__tagline{
  font-family:var(--mono);font-size:10px;letter-spacing:.16em;color:var(--muted);
}
@media (min-width:960px){
  .topbar__inner{padding-left:0}
  .brand{
    flex:0 0 var(--rail-w);height:100%;align-items:center;
    padding-left:18px;border-right:1px solid var(--frame);
  }
}

/* 焦点信息 */
.ticker{display:flex;align-items:center;gap:10px;min-width:0;flex:1 1 auto}
.ticker__dot{
  width:7px;height:7px;flex:0 0 7px;border-radius:50%;
  background:var(--lime);box-shadow:0 0 0 4px rgba(184,255,61,.14);
  animation:pulse 2.4s var(--ease) infinite;
}
@keyframes pulse{
  0%,100%{opacity:1;transform:scale(1)}
  50%{opacity:.45;transform:scale(.82)}
}
.ticker__label{
  font-family:var(--mono);font-size:10px;letter-spacing:.16em;text-transform:uppercase;
  color:var(--cyan);
}
.ticker__value{
  font-family:var(--mono);font-size:12px;letter-spacing:.06em;color:var(--muted);
  white-space:nowrap;overflow:hidden;text-overflow:ellipsis;
}

/* 联赛筛选碎片 */
.league-filter{display:flex;align-items:center;gap:6px;flex-wrap:nowrap}
.league-chip{
  font-family:var(--mono);font-size:11px;letter-spacing:.1em;
  padding:5px 11px;cursor:pointer;
  color:var(--muted);background:rgba(34,52,79,.3);
  border:1px solid var(--frame);border-radius:2px;
  transition:color .2s var(--ease),border-color .2s var(--ease),background .2s var(--ease);
}
.league-chip:hover{color:var(--ink);border-color:#3B567F}
.league-chip[aria-pressed="true"]{
  color:#04121A;background:var(--cyan);border-color:var(--cyan);font-weight:700;
}

/* 右侧工具 */
.topbar__utility{display:flex;align-items:center;gap:16px;margin-left:auto}
.util-link{
  font-family:var(--mono);font-size:11px;letter-spacing:.1em;
  color:var(--muted);text-decoration:none;
  border-bottom:1px solid transparent;padding-bottom:2px;
  transition:color .2s var(--ease),border-color .2s var(--ease);
}
.util-link:hover{color:var(--cyan);border-bottom-color:var(--cyan)}

/* 移动导航按钮 */
.nav-toggle{
  display:none;align-items:center;gap:9px;
  background:transparent;border:1px solid var(--frame);border-radius:2px;
  color:var(--ink);padding:7px 11px;cursor:pointer;
  transition:border-color .2s var(--ease),color .2s var(--ease);
}
.nav-toggle:hover{border-color:var(--cyan);color:var(--cyan)}
.nav-toggle__text{font-family:var(--mono);font-size:10px;letter-spacing:.14em}
.nav-toggle__bars{position:relative;display:block;width:16px;height:11px}
.nav-toggle__bars::before,.nav-toggle__bars::after{
  content:"";position:absolute;left:0;right:0;height:1.5px;background:var(--cyan);
  transition:transform .24s var(--ease);
}
.nav-toggle__bars::before{top:0}
.nav-toggle__bars::after{bottom:0}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::before{transform:translateY(4.75px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::after{transform:translateY(-4.75px) rotate(-45deg)}

/* 桌面：左侧竖向索引，导航即左边框 */
.rail-nav{
  position:fixed;top:var(--topbar-h);left:0;bottom:0;width:var(--rail-w);z-index:2;
  display:flex;flex-direction:column;justify-content:space-between;gap:20px;
  padding:26px 0 22px;
  background:linear-gradient(180deg,rgba(14,27,46,.72),rgba(6,13,24,.94));
  -webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);
  border-right:1px solid var(--frame);
  overflow-y:auto;
}
.rail-nav::before{
  content:"";position:absolute;top:0;right:-6px;height:100%;width:11px;
  background:repeating-linear-gradient(180deg,var(--frame) 0 1px,transparent 1px 30px);
  opacity:.55;pointer-events:none;
}
.rail-nav__note{
  font-family:var(--mono);font-size:10px;letter-spacing:.16em;
  color:var(--muted);padding-inline:18px;text-transform:uppercase;
}
.rail-nav__list{display:flex;flex-direction:column;gap:2px}
.rail-nav__item{list-style:none}
.rail-nav__link{
  display:flex;align-items:baseline;gap:10px;
  padding:11px 18px;text-decoration:none;
  color:var(--muted);font-size:.95rem;line-height:1.3;
  border-left:2px solid transparent;
  transition:color .24s var(--ease),background .24s var(--ease),border-color .24s var(--ease),padding-left .24s var(--ease);
}
.rail-nav__link:hover{color:var(--ink);background:rgba(44,224,200,.07);padding-left:22px}
.rail-nav__link[aria-current="page"]{
  color:var(--cyan);border-left-color:var(--cyan);
  background:linear-gradient(90deg,rgba(44,224,200,.16),transparent 88%);
}
.rail-nav__index{font-family:var(--mono);font-size:10px;letter-spacing:.1em;opacity:.7}
.rail-nav__label{font-weight:600}
.rail-nav__foot{
  display:flex;flex-direction:column;gap:12px;
  padding:18px 18px 0;border-top:1px solid var(--frame);
}
.rail-nav__cta{width:100%;justify-content:center;font-size:.85rem;padding-inline:10px}

/* 遮罩（仅移动端） */
.nav-scrim{display:none}

/* ---------- 7. 按钮 ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:.55em;
  padding:.8rem 1.35rem;border:1px solid transparent;border-radius:2px;
  font-size:.95rem;font-weight:700;letter-spacing:.02em;
  text-decoration:none;cursor:pointer;
  transition:transform .24s var(--ease),background .24s var(--ease),color .24s var(--ease),border-color .24s var(--ease),box-shadow .24s var(--ease);
}
.btn--primary{
  background:var(--orange);color:#0A1018;
  clip-path:polygon(0 0,calc(100% - 12px) 0,100% 100%,12px 100%);
  box-shadow:0 0 0 0 rgba(255,106,43,0);
}
.btn--primary:hover{
  background:#FF8149;transform:translateY(-2px);
  box-shadow:0 10px 26px -14px rgba(255,106,43,.9);
}
.btn--ghost{
  border-color:var(--frame);color:var(--ink);background:rgba(34,52,79,.22);
}
.btn--ghost:hover{border-color:var(--cyan);color:var(--cyan)}
.btn--quiet{
  padding-inline:0;color:var(--cyan);background:none;border:0;
  border-bottom:1px solid rgba(44,224,200,.5);
}
.btn--quiet:hover{color:var(--lime);border-bottom-color:var(--lime)}

/* ---------- 8. 容器与网格 ---------- */
.container{width:min(100% - (var(--gutter) * 2),var(--maxw));margin-inline:auto}
.container--narrow{width:min(100% - (var(--gutter) * 2),760px);margin-inline:auto}
.grid{display:grid;grid-template-columns:repeat(12,minmax(0,1fr));gap:clamp(16px,2vw,28px)}
.col-3{grid-column:span 3}
.col-4{grid-column:span 4}
.col-6{grid-column:span 6}
.col-7{grid-column:span 7}
.col-8{grid-column:span 8}
.col-9{grid-column:span 9}
.note-col{
  grid-column:span 3;
  font-family:var(--mono);font-size:12px;letter-spacing:.05em;line-height:1.9;
  color:var(--muted);border-top:1px solid var(--frame);padding-top:14px;
}

/* ---------- 9. 章节节奏 ---------- */
.section{padding-block:clamp(64px,9vw,140px)}
.section--tight{padding-block:clamp(40px,5vw,72px)}
.section__label{
  display:inline-flex;align-items:center;gap:12px;
  font-family:var(--mono);font-size:11px;letter-spacing:.16em;text-transform:uppercase;
  color:var(--cyan);margin-bottom:20px;
}
.section__label::before{content:"";width:28px;height:1px;background:var(--cyan)}
.section__title{margin-bottom:18px}
.section__lead{
  font-size:clamp(1rem,1.4vw,1.125rem);color:var(--muted);max-width:34em;
}
.prose{max-width:34em;font-size:1rem;line-height:1.85;color:#D5E0EE}
.prose p{margin-bottom:1.15em}
.prose h2,.prose h3{margin:2.1em 0 .65em;color:var(--ink)}
.prose ul{list-style:none;margin-bottom:1.15em}
.prose li{padding-left:1.1em;position:relative}
.prose li::before{content:"";position:absolute;left:0;top:.75em;width:6px;height:1px;background:var(--cyan)}
.prose a{color:var(--cyan);text-decoration:none;border-bottom:1px solid rgba(44,224,200,.45)}

/* ---------- 10. 基础组件 ---------- */
.glass{
  background:rgba(34,52,79,.34);
  -webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);
  border:1px solid var(--frame);border-radius:2px;
}
.plate{
  position:relative;background:var(--field);
  border:1px solid var(--frame);border-radius:2px;
  padding:clamp(18px,2.4vw,30px);
}
.plate::before,.plate::after{
  content:"";position:absolute;width:14px;height:14px;
  border:1px solid var(--cyan);pointer-events:none;
}
.plate::before{top:-1px;left:-1px;border-right:0;border-bottom:0}
.plate::after{bottom:-1px;right:-1px;border-left:0;border-top:0}
.plate--paper{background:var(--paper);border-color:#C9D5E6;color:#0B1420}
.plate--paper::before,.plate--paper::after{border-color:var(--blue)}
.plate--paper a{color:#1653D6}

.cut-block{
  background:linear-gradient(115deg,var(--orange),#FF8A4B);
  color:#0A1018;padding:clamp(20px,3vw,34px);
  clip-path:polygon(0 0,100% 0,calc(100% - 30px) 100%,0 100%);
}
.cut-block h3{color:#0A1018}

.tag{
  display:inline-flex;align-items:center;gap:6px;
  font-family:var(--mono);font-size:11px;letter-spacing:.12em;text-transform:uppercase;
  padding:4px 10px;border:1px solid var(--frame);border-radius:2px;
  color:var(--muted);background:rgba(34,52,79,.24);
}
.tag--live{color:var(--lime);border-color:rgba(184,255,61,.42);background:rgba(184,255,61,.08)}

.card{
  position:relative;display:flex;flex-direction:column;
  padding:clamp(18px,2.4vw,28px);border:1px solid var(--frame);border-radius:2px;
  background:linear-gradient(160deg,rgba(14,27,46,.92),rgba(6,13,24,.92));
  transition:border-color .3s var(--ease),transform .3s var(--ease);
}
.card:hover{border-color:rgba(44,224,200,.55);transform:translateY(-3px)}
.card__label{font-family:var(--mono);font-size:11px;letter-spacing:.14em;text-transform:uppercase;color:var(--muted)}
.card__title{font-size:1.15rem;font-weight:800;margin:12px 0 10px;line-height:1.35}
.card__body{font-size:.94rem;color:var(--muted);margin-bottom:16px}
.card__meta{margin-top:auto;font-family:var(--mono);font-size:11px;letter-spacing:.1em;color:var(--cyan)}

.stat{display:flex;flex-direction:column;gap:8px}
.stat__value{
  font-family:var(--mono);font-weight:700;font-variant-numeric:tabular-nums;
  font-size:clamp(2rem,6vw,3.6rem);line-height:1;letter-spacing:-.02em;
}
.stat__label{font-size:.85rem;color:var(--muted)}
.stat__delta{font-family:var(--mono);font-size:12px;letter-spacing:.08em;color:var(--muted)}
.stat--up .stat__delta{color:var(--lime)}
.stat--down .stat__delta{color:var(--red)}

/* 图片容器：无远程资源，缺图时以渐变网格占位 */
.media{
  position:relative;display:block;width:100%;overflow:hidden;
  border:1px solid var(--frame);border-radius:2px;
  background:
    linear-gradient(140deg,rgba(47,107,255,.28),transparent 58%),
    linear-gradient(160deg,var(--field),var(--deep) 78%);
}
.media::after{
  content:"";position:absolute;inset:0;pointer-events:none;
  background:repeating-linear-gradient(135deg,rgba(44,224,200,.12) 0 1px,transparent 1px 15px);
  mix-blend-mode:screen;opacity:.7;
}
.media img,.media svg,.media video{display:block;width:100%;height:100%;object-fit:cover;position:relative;z-index:1}
.media--16x9{aspect-ratio:16/9}
.media--4x3{aspect-ratio:4/3}
.media--1x1{aspect-ratio:1/1}
.media--21x9{aspect-ratio:21/9}
.media__tag{
  position:absolute;top:0;left:0;z-index:2;
  font-family:var(--mono);font-size:10px;letter-spacing:.14em;text-transform:uppercase;
  background:var(--cyan);color:#04121A;padding:5px 9px;
}
.media__caption{
  margin-top:10px;font-family:var(--mono);font-size:11px;letter-spacing:.06em;
  color:var(--muted);line-height:1.7;
}

/* 面包屑 */
.breadcrumbs{font-family:var(--mono);font-size:11px;letter-spacing:.12em;color:var(--muted)}
.breadcrumbs__list{display:flex;flex-wrap:wrap;align-items:center;gap:8px}
.breadcrumbs__item{display:inline-flex;align-items:center;gap:8px;list-style:none}
.breadcrumbs__item[aria-current="page"]{color:var(--ink)}
.breadcrumbs__sep{color:var(--frame)}
.breadcrumbs__link{color:var(--muted);text-decoration:none;transition:color .2s var(--ease)}
.breadcrumbs__link:hover{color:var(--cyan)}

/* 页内章节索引（滚动高亮） */
.index-nav{border-left:1px solid var(--frame);padding-left:16px}
.index-nav__list{display:flex;flex-direction:column;gap:10px}
.index-nav__link{
  position:relative;font-family:var(--mono);font-size:12px;letter-spacing:.08em;
  color:var(--muted);text-decoration:none;transition:color .24s var(--ease);
}
.index-nav__link:hover{color:var(--ink)}
.index-nav__link[aria-current="true"]{color:var(--cyan)}
.index-nav__link[aria-current="true"]::before{
  content:"";position:absolute;left:-17px;top:.62em;width:10px;height:1px;background:var(--cyan);
}

/* 筛选隐藏态 */
[data-filtered-out]{display:none !important}

/* 滚动显现（仅 JS 生效后隐藏，脚本失效内容依旧可读） */
[data-reveal]{transition:opacity .32s var(--ease),transform .32s var(--ease)}
html[data-js="true"] [data-reveal]{opacity:0;transform:translateY(14px)}
html[data-js="true"] [data-reveal].is-visible{opacity:1;transform:none}

/* ---------- 11. 页脚 ---------- */
.site-footer{
  position:relative;overflow:hidden;
  margin-top:clamp(72px,9vw,140px);
  border-top:1px solid var(--frame);
  background:linear-gradient(180deg,rgba(14,27,46,.6),#030711 62%);
}
.site-footer::before{
  content:"";position:absolute;top:0;left:0;right:0;height:1px;
  background:linear-gradient(90deg,var(--cyan),rgba(44,224,200,0) 68%);
}
.footer__wordmark{
  position:absolute;right:-.05em;bottom:-.3em;
  font-family:var(--mono);font-weight:700;letter-spacing:-.05em;line-height:.78;
  font-size:clamp(6rem,20vw,16rem);
  color:rgba(234,241,250,.035);
  pointer-events:none;user-select:none;
}
.footer__inner{
  position:relative;z-index:1;
  width:min(100% - (var(--gutter) * 2),var(--maxw));
  margin-inline:auto;padding-block:clamp(48px,6vw,88px);
}
.footer__top{
  display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1.7fr);
  gap:clamp(32px,5vw,72px);align-items:start;
}
.footer__brand{display:flex;flex-direction:column;align-items:flex-start;gap:18px}
.brand--footer .brand__mark{font-size:1.35rem}
.footer__intro{
  font-size:.95rem;color:var(--muted);max-width:30em;
  border-left:2px solid var(--orange);padding-left:14px;
}
.footer__cta{margin-top:2px}
.footer__nav{min-width:0}
.footer__grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:clamp(20px,3vw,36px)}
.footer__col-title{
  font-family:var(--mono);font-size:11px;letter-spacing:.16em;text-transform:uppercase;
  color:var(--cyan);margin-bottom:16px;font-weight:700;
}
.footer__links{display:flex;flex-direction:column;gap:9px}
.footer__link{
  display:inline-block;font-size:.92rem;color:var(--muted);text-decoration:none;
  transition:color .2s var(--ease),transform .2s var(--ease);
}
.footer__link:hover{color:var(--ink);transform:translateX(3px)}
.footer__contact{
  margin-top:clamp(36px,5vw,64px);padding-top:clamp(24px,3vw,36px);
  border-top:1px solid var(--frame);
}
.footer__contact-list{display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));gap:12px 28px}
.footer__contact-row{display:flex;gap:10px;align-items:baseline}
.footer__contact-key{
  flex:0 0 auto;min-width:42px;
  font-family:var(--mono);font-size:11px;letter-spacing:.12em;color:var(--muted);
}
.footer__contact-value{
  font-family:var(--mono);font-size:.92rem;color:var(--ink);
  font-variant-numeric:tabular-nums;word-break:break-all;
}
.footer__note{margin-top:16px;font-size:.85rem;color:var(--muted);max-width:56ch}
.footer__meta{
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;
  gap:12px 24px;margin-top:clamp(28px,4vw,48px);padding-top:18px;
  border-top:1px solid var(--frame);
  font-family:var(--mono);font-size:11px;letter-spacing:.1em;color:var(--muted);
}
.footer__icp,.footer__copy{margin:0}
.to-top{
  display:inline-flex;align-items:center;gap:8px;
  padding:8px 14px;cursor:pointer;
  font-family:var(--mono);font-size:11px;letter-spacing:.12em;
  color:var(--muted);background:transparent;
  border:1px solid var(--frame);border-radius:2px;
  transition:color .2s var(--ease),border-color .2s var(--ease),opacity .24s var(--ease);
}
.to-top:hover{color:var(--cyan);border-color:var(--cyan)}
.to-top[data-visible="false"]{opacity:0;pointer-events:none}

/* ---------- 12. 断点 ---------- */
@media (max-width:1199px){
  .league-filter{display:none}
}
@media (max-width:959px){
  :root{--topbar-h:46px}
  .nav-toggle{display:inline-flex}
  .topbar__inner{padding-inline:14px;gap:12px}
  .ticker{flex:1 1 auto}
  .ticker__value{display:none}

  .rail-nav{
    top:auto;left:0;right:0;bottom:0;width:auto;height:auto;max-height:80vh;
    padding:20px 14px 26px;
    border-right:0;border-top:1px solid var(--frame);
    border-radius:0;
    transform:translateY(112%);visibility:hidden;
    transition:transform .34s var(--ease),visibility .34s var(--ease);
  }
  .rail-nav[data-open="true"]{
    transform:translateY(0);visibility:visible;
    box-shadow:0 -24px 60px -20px rgba(0,0,0,.9);
  }
  .rail-nav::before{display:none}
  .rail-nav__note{padding-inline:4px}
  .rail-nav__list{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:6px;margin-top:14px}
  .rail-nav__link{
    border-left:0;border:1px solid var(--frame);border-radius:2px;
    padding:12px 12px;background:rgba(34,52,79,.24);
  }
  .rail-nav__link:hover{padding-left:12px;transform:none}
  .rail-nav__link[aria-current="page"]{background:rgba(44,224,200,.14);border-color:rgba(44,224,200,.6)}
  .rail-nav__foot{padding:16px 4px 0;border-top:0}
  .rail-nav__cta{max-width:260px}

  html[data-nav-open="true"],
  html[data-nav-open="true"] body{overflow:hidden}

  .nav-scrim{
    display:block;position:fixed;inset:0;z-index:1;
    border:0;padding:0;background:rgba(3,7,13,.62);
    opacity:0;visibility:hidden;cursor:pointer;
    transition:opacity .3s var(--ease),visibility .3s var(--ease);
  }
  .nav-scrim[data-open="true"]{opacity:1;visibility:visible}

  .footer__top{grid-template-columns:1fr}
}
@media (max-width:900px){
  .col-3,.col-4,.col-6,.col-7,.col-8,.col-9{grid-column:span 12}
  .note-col{grid-column:span 12}
  .grid{gap:16px}
}
@media (max-width:860px){
  .footer__grid{grid-template-columns:repeat(2,minmax(0,1fr))}
  .footer__contact-list{grid-template-columns:1fr}
}
@media (max-width:620px){
  .brand__tagline{display:none}
  .util-link:first-child{display:none}
  .footer__grid{grid-template-columns:1fr}
  .footer__meta{justify-content:flex-start}
  .prose,.section__lead{max-width:none}
}

/* ---------- 13. 动效降级 ---------- */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
  }
  html[data-js="true"] [data-reveal]{opacity:1;transform:none}
  .read-progress__bar{transition:none}
}