/* ==========================================================================
   博奥体育中心 · 共享样式 /assets/site.css
   蓝图网格 / 越位线 / 战术板 —— 头尾与通用组件
   ========================================================================== */

/* 01 · 变量 ---------------------------------------------------------------- */
:root{
  --turf:#0B1F1A;
  --turf-2:#132E26;
  --turf-3:#17392F;
  --ink:#06110E;
  --cyan:#3EF2C8;
  --line:#E8F4F1;
  --orange:#FF5A3C;
  --amber:#FFC24B;
  --violet:#7B8CFF;
  --muted:#7A9A90;
  --white:#FFFFFF;
  --hairline:rgba(232,244,241,.16);
  --hairline-strong:rgba(232,244,241,.32);
  --cyan-veil:rgba(62,242,200,.14);
  --maxw:1440px;
  --gutter:24px;
  --ease:cubic-bezier(.2,0,0,1);
  --cut:14px;
  --cut-sm:10px;
  --font-sans:"Source Han Sans SC","Noto Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",Inter,"Helvetica Neue",Arial,sans-serif;
  --font-condensed:"Roboto Condensed","Inter Tight",Inter,"Source Han Sans SC","PingFang SC","Microsoft YaHei",sans-serif;
  --font-num:Inter,"Roboto Condensed","Helvetica Neue",Arial,"PingFang SC",sans-serif;
}

/* 02 · Reset --------------------------------------------------------------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;text-size-adjust:100%}
body,h1,h2,h3,h4,h5,p,ul,ol,li,figure,blockquote,dl,dd,fieldset{margin:0;padding:0}
ul,ol{list-style:none}
img,svg,video{display:block;max-width:100%}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
table{border-collapse:collapse;border-spacing:0}
:focus-visible{outline:2px solid var(--cyan);outline-offset:2px;border-radius:2px}
@media (prefers-reduced-motion:no-preference){html{scroll-behavior:smooth}}

/* 03 · 基础排版与草皮底 ---------------------------------------------------- */
body{
  background:var(--turf);
  color:var(--line);
  font-family:var(--font-sans);
  font-size:16px;
  line-height:1.75;
  min-height:100vh;
  overflow-x:hidden;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
body::before{
  content:"";position:fixed;inset:0;z-index:0;pointer-events:none;
  background-image:repeating-linear-gradient(90deg,rgba(232,244,241,.04) 0 96px,transparent 96px 192px);
}
#main-content{position:relative;z-index:1;display:block;scroll-margin-top:140px}

.num,.stat__value,.timestamp,.index-list__num,.footer-bottom{font-family:var(--font-num);font-variant-numeric:tabular-nums;font-feature-settings:"tnum" 1;letter-spacing:0}
.index-text{font-size:12px;font-weight:500;letter-spacing:.12em;color:var(--muted)}
.condensed{font-family:var(--font-condensed);font-size:14px;line-height:1.35;letter-spacing:.01em}
.display-skew{font-weight:250;font-size:clamp(64px,9vw,160px);line-height:.92;letter-spacing:-.02em;transform:skewX(-1.5deg);transform-origin:left bottom}
.text-muted{color:var(--muted)}
.visually-hidden{position:absolute!important;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0}

/* 04 · 蓝图网格与容器 ------------------------------------------------------ */
.shell{width:100%;max-width:var(--maxw);margin:0 auto;padding:0 var(--gutter)}
.grid{display:grid;grid-template-columns:repeat(12,minmax(0,1fr));gap:8px}
.grid--wide{gap:32px}
.col-3{grid-column:span 3}
.col-4{grid-column:span 4}
.col-5{grid-column:span 5}
.col-6{grid-column:span 6}
.col-7{grid-column:span 7}
.col-8{grid-column:span 8}
.col-9{grid-column:span 9}
.col-12{grid-column:span 12}

/* 05 · 跳转链接 ------------------------------------------------------------ */
.skip-link{
  position:absolute;left:16px;top:-64px;z-index:200;
  padding:10px 18px;background:var(--cyan);color:var(--ink);
  font-size:13px;font-weight:600;letter-spacing:.08em;
  transition:top 140ms var(--ease);
}
.skip-link:focus{top:10px}

/* 06 · 页头 ---------------------------------------------------------------- */
.site-header{
  position:sticky;top:0;z-index:100;
  background:rgba(6,17,14,.94);
  -webkit-backdrop-filter:blur(10px);
  backdrop-filter:blur(10px);
  border-bottom:1px solid var(--hairline);
}
.site-header::after{
  content:"";position:absolute;left:0;right:0;bottom:-1px;height:1px;
  background:linear-gradient(90deg,var(--cyan),rgba(62,242,200,0) 44%);
  opacity:.8;pointer-events:none;
}
.site-header[data-scrolled="true"]{background:rgba(6,17,14,.98)}
.header-rail{display:block}
.header-inner{
  max-width:var(--maxw);margin:0 auto;
  padding:12px var(--gutter);
  display:flex;align-items:center;justify-content:space-between;gap:20px;
  transition:padding 160ms var(--ease);
}

/* 品牌区 */
.brand{display:flex;align-items:center;gap:12px;min-height:42px}
.brand__mark{flex:none;width:3px;height:30px;background:var(--cyan);transform:skewX(-3deg);transition:height 160ms var(--ease)}
.brand__text{display:flex;flex-direction:column;gap:1px}
.brand__name{font-size:18px;font-weight:500;letter-spacing:.06em;line-height:1.25;transition:font-size 160ms var(--ease)}
.brand__name-short{display:none}
.brand__sub{font-size:11px;font-weight:500;letter-spacing:.16em;color:var(--muted)}
.brand__round{
  margin-left:6px;padding-left:12px;border-left:1px solid var(--hairline);
  font-family:var(--font-num);font-size:11px;letter-spacing:.1em;color:var(--cyan);white-space:nowrap;
}

/* 栏目索引 */
.primary-nav{display:flex;align-items:center}
.primary-nav__title{display:none}
.primary-nav__list{display:flex;align-items:center}
.primary-nav__list > li{display:flex;align-items:center}
.primary-nav__list > li + li{border-left:.5px solid var(--hairline)}
.nav-link{
  position:relative;display:inline-block;
  padding:9px 16px;font-size:14px;letter-spacing:.06em;
  color:rgba(232,244,241,.78);
  transition:color 120ms var(--ease),background-color 120ms var(--ease);
}
.nav-link::before{
  content:"";position:absolute;left:0;top:50%;width:2px;height:16px;
  background:var(--cyan);transform:translateY(-50%) scaleY(0);
  transform-origin:center;transition:transform 120ms var(--ease);
}
.nav-link::after{
  content:"";position:absolute;left:16px;right:16px;bottom:0;height:2px;
  background:var(--cyan);transform:scaleX(0);transform-origin:left center;
  transition:transform 120ms var(--ease);
}
.nav-link:hover{color:var(--white);background:var(--turf-2)}
.nav-link:hover::before{transform:translateY(-50%) scaleY(1)}
.nav-link[aria-current="page"]{color:var(--cyan)}
.nav-link[aria-current="page"]::after{transform:scaleX(1)}

/* 移动开关 */
.nav-toggle{
  display:none;align-items:center;gap:9px;
  padding:9px 12px;border:1px solid var(--hairline);
  color:var(--line);font-size:12px;letter-spacing:.14em;
  transition:border-color 120ms var(--ease),color 120ms var(--ease);
}
.nav-toggle:hover{border-color:var(--cyan);color:var(--cyan)}
.nav-toggle__bars{position:relative;flex:none;width:16px;height:10px}
.nav-toggle__bars::before,.nav-toggle__bars::after{
  content:"";position:absolute;left:0;width:16px;height:1.5px;background:var(--cyan);
  transition:transform 140ms var(--ease),top 140ms var(--ease);
}
.nav-toggle__bars::before{top:0}
.nav-toggle__bars::after{top:8px}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::before{top:4px;transform:rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::after{top:4px;transform:rotate(-45deg)}

/* 遮罩 */
.nav-scrim{
  position:fixed;inset:0;z-index:110;
  background:rgba(6,17,14,.66);
  opacity:0;visibility:hidden;
  transition:opacity 140ms var(--ease),visibility 0s linear 140ms;
}
.nav-scrim[data-visible]{opacity:1;visibility:visible;transition:opacity 140ms var(--ease),visibility 0s linear 0s}

/* 赛季时间轴 */
.season-rail{
  height:58px;overflow:hidden;
  background:var(--ink);border-top:1px solid var(--hairline);
  transition:height 160ms var(--ease);
}
.season-rail__inner{
  max-width:var(--maxw);height:100%;margin:0 auto;padding:0 var(--gutter);
  display:flex;align-items:center;gap:16px;
}
.season-rail__label{flex:none;font-size:11px;letter-spacing:.16em;color:var(--muted);white-space:nowrap}
.season-track{
  position:relative;flex:1 1 auto;display:flex;align-items:center;gap:2px;
  padding:12px 0;overflow-x:auto;overflow-y:hidden;
  scrollbar-width:thin;scrollbar-color:rgba(232,244,241,.24) transparent;
}
.season-track::-webkit-scrollbar{height:3px}
.season-track::-webkit-scrollbar-thumb{background:rgba(232,244,241,.24)}
.season-track::before{
  content:"";position:absolute;left:0;right:0;top:50%;height:1px;
  background:var(--hairline);pointer-events:none;
}
.season-track__node{
  position:relative;z-index:1;flex:0 0 auto;
  width:26px;height:26px;display:grid;place-items:center;
  background:var(--ink);border:1px solid transparent;
  font-family:var(--font-num);font-variant-numeric:tabular-nums;
  font-size:10px;font-weight:500;letter-spacing:.02em;color:var(--muted);
  transition:color 120ms var(--ease),background-color 120ms var(--ease),border-color 120ms var(--ease);
}
.season-track__node:hover,.season-track__node:focus-visible{color:var(--cyan);border-color:var(--cyan)}
.season-track__node[data-pending="true"]{border-style:dashed;border-color:rgba(232,244,241,.14);color:rgba(122,154,144,.55)}
.season-track__node.is-current{background:var(--cyan);color:var(--ink);font-weight:600}
.season-track__node.is-selected{border-color:var(--cyan);color:var(--cyan)}
.season-track__node.is-current::after{
  content:"";position:absolute;left:50%;bottom:-8px;width:4px;height:4px;
  margin-left:-2px;background:var(--cyan);border-radius:50%;
}
.season-rail__readout{
  flex:none;min-width:250px;text-align:right;white-space:nowrap;
  font-family:var(--font-num);font-variant-numeric:tabular-nums;
  font-size:11px;letter-spacing:.08em;color:var(--cyan);
}

/* 页头压缩态 */
.site-header[data-compact="true"] .header-inner{padding:7px var(--gutter)}
.site-header[data-compact="true"] .brand__mark{height:20px}
.site-header[data-compact="true"] .brand__name{font-size:15px}
.site-header[data-compact="true"] .brand__name-full{display:none}
.site-header[data-compact="true"] .brand__name-short{display:inline}
.site-header[data-compact="true"] .brand__sub,
.site-header[data-compact="true"] .brand__round{display:none}
.site-header[data-compact="true"] .nav-link{padding:7px 14px}
.site-header[data-compact="true"] .season-rail{height:48px}
.site-header[data-compact="true"] .season-track__node{width:22px;height:22px}

/* 07 · 页脚 ---------------------------------------------------------------- */
.site-footer{
  position:relative;z-index:1;
  margin-top:96px;background:var(--ink);
  border-top:1px solid var(--hairline-strong);
}
.footer-shell{max-width:var(--maxw);margin:0 auto;padding:56px var(--gutter) 26px}
.footer-masthead{
  display:flex;align-items:flex-end;justify-content:space-between;gap:24px;
  padding-bottom:24px;border-bottom:1px solid var(--hairline);
}
.footer-brand{display:flex;flex-direction:column;gap:7px}
.footer-brand__mark{width:58px;height:2px;background:var(--cyan);transform:skewX(-12deg)}
.footer-brand__name{font-size:20px;font-weight:400;letter-spacing:.08em}
.footer-brand__line{font-size:12px;letter-spacing:.12em;color:var(--muted)}

.footer-grid{
  display:grid;grid-template-columns:repeat(4,minmax(0,1fr));
  padding:32px 0;border-bottom:1px solid var(--hairline);
}
.footer-col{padding:0 24px;border-left:.5px solid var(--hairline)}
.footer-col:first-child{padding-left:0;border-left:0}
.footer-col:last-child{padding-right:0}
.footer-col__title{margin-bottom:14px;font-size:12px;font-weight:500;letter-spacing:.14em;color:var(--muted)}
.footer-list{display:flex;flex-direction:column;gap:9px}
.footer-link{font-family:var(--font-condensed);font-size:14px;line-height:1.35;color:rgba(232,244,241,.82);transition:color 120ms var(--ease)}
.footer-link:hover{color:var(--cyan)}
.footer-contact{display:flex;flex-direction:column;gap:9px;font-family:var(--font-condensed);font-size:14px;line-height:1.45;color:rgba(232,244,241,.82)}
.footer-note{margin-top:12px;font-size:12px;line-height:1.65;color:var(--muted)}
.footer-bottom{
  display:flex;align-items:center;justify-content:space-between;gap:16px;
  padding-top:20px;font-size:12px;letter-spacing:.06em;color:var(--muted);
}
.footer-bottom__icp{color:rgba(232,244,241,.7)}
.footer-bottom__stamp{color:var(--muted)}

/* 08 · 章节系统 ------------------------------------------------------------ */
.chapter{position:relative;padding:72px 0 0}
.chapter__num{
  display:block;font-family:var(--font-num);font-variant-numeric:tabular-nums;
  font-size:clamp(48px,6vw,72px);font-weight:300;line-height:1;
  letter-spacing:-.02em;color:rgba(62,242,200,.28);
}
.chapter__title{margin-top:6px;font-size:clamp(24px,3vw,38px);font-weight:300;line-height:1.2;letter-spacing:.02em}
.chapter__lead{margin-top:14px;max-width:34em;font-size:16px;line-height:1.75;color:rgba(232,244,241,.72)}

/* 09 · 面板 / 数据块 / 标签 ------------------------------------------------ */
.panel{
  position:relative;padding:24px;
  background:var(--turf-2);border:1px solid var(--hairline);
  clip-path:polygon(0 0,calc(100% - var(--cut)) 0,100% var(--cut),100% 100%,0 100%);
  transition:background-color 140ms var(--ease);
}
.panel::before{
  content:"";position:absolute;left:0;top:0;bottom:0;width:2px;
  background:var(--cyan);transform:scaleY(0);transform-origin:top center;
  transition:transform 140ms var(--ease);
}
.panel:hover{background:var(--turf-3)}
.panel:hover::before{transform:scaleY(1)}
.panel--dark{background:var(--ink)}
.panel--flush{padding:0}

.stat{
  display:flex;flex-direction:column;gap:5px;
  padding:16px 18px;background:rgba(19,46,38,.7);
  border-left:2px solid var(--cyan);
}
.stat__value{font-size:clamp(30px,4vw,48px);font-weight:300;line-height:1;color:var(--white)}
.stat__label{font-size:12px;letter-spacing:.12em;color:var(--muted)}

.timestamp{
  position:absolute;top:12px;right:14px;z-index:2;
  font-size:11px;letter-spacing:.08em;color:var(--muted);
}
.tag{
  display:inline-flex;align-items:center;gap:6px;
  padding:3px 9px;border:1px solid var(--hairline);
  font-size:11px;letter-spacing:.1em;color:var(--line);
}
.tag--live{border-color:var(--cyan);color:var(--cyan)}
.tag--window{border-color:var(--amber);color:var(--amber)}
.tag--drop{border-color:var(--orange);color:var(--orange)}
.tag--away{border-color:var(--violet);color:var(--violet)}

/* 10 · 按钮 ---------------------------------------------------------------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:10px;
  padding:13px 24px;font-size:14px;letter-spacing:.1em;
  background:var(--turf-2);color:var(--line);border:1px solid transparent;
  clip-path:polygon(0 0,calc(100% - var(--cut-sm)) 0,100% var(--cut-sm),100% 100%,0 100%);
  transition:background-color 140ms var(--ease),color 140ms var(--ease),border-color 140ms var(--ease);
}
.btn:hover{background:var(--turf-3);color:var(--white)}
.btn--primary{background:var(--orange);color:#140703;font-weight:600}
.btn--primary:hover{background:#FF7558;color:#140703}
.btn--ghost{background:transparent;border-color:var(--cyan);color:var(--cyan)}
.btn--ghost:hover{background:var(--cyan-veil);color:var(--white);border-color:var(--cyan)}

/* 11 · 面包屑 / 正文 ------------------------------------------------------- */
.breadcrumb{display:flex;flex-wrap:wrap;align-items:center;gap:10px;font-size:12px;letter-spacing:.1em;color:var(--muted)}
.breadcrumb li{display:flex;align-items:center;gap:10px}
.breadcrumb li + li::before{content:"";width:12px;height:1px;background:var(--hairline-strong)}
.breadcrumb a:hover{color:var(--cyan)}
.breadcrumb [aria-current="page"]{color:var(--line)}

.prose{max-width:38em;font-size:16.5px;line-height:1.75;color:rgba(232,244,241,.86)}
.prose p + p{margin-top:1.2em}
.prose h2{margin:1.8em 0 .6em;font-size:24px;font-weight:400;letter-spacing:.02em}
.prose h3{margin:1.6em 0 .5em;font-size:18px;font-weight:500;letter-spacing:.02em}
.prose ul,.prose ol{margin:1em 0 1em 1.2em;list-style:disc}
.prose ol{list-style:decimal}
.prose li{margin:.4em 0}
.prose a{border-bottom:1px solid var(--cyan);color:var(--cyan)}
.prose strong{font-weight:600;color:var(--white)}

/* 12 · 越位线与列表 -------------------------------------------------------- */
.rule{position:relative;height:1px;background:var(--hairline);overflow:hidden}
.rule::after{
  content:"";position:absolute;left:0;right:0;top:0;height:1px;
  background:linear-gradient(90deg,var(--cyan),rgba(62,242,200,0));
  transform:scaleX(0);transform-origin:left center;
  transition:transform 240ms var(--ease);
}
.rule.is-drawn::after{transform:scaleX(1)}
.rule--skew{transform:skewY(-.6deg)}

.index-list{border-top:1px solid var(--hairline)}
.index-list__item{
  display:grid;grid-template-columns:48px 1fr auto;gap:14px;align-items:baseline;
  padding:12px 2px;border-bottom:1px solid var(--hairline);
  font-family:var(--font-condensed);font-size:14px;line-height:1.35;
  transition:background-color 140ms var(--ease);
}
.index-list__item:hover{background:rgba(19,46,38,.65)}
.index-list__num{font-size:11px;letter-spacing:.08em;color:var(--muted)}
.index-list__item.is-active .index-list__num{color:var(--cyan)}

.index-trace{position:relative;padding-left:18px;font-size:12px;letter-spacing:.1em;color:var(--muted)}
.index-trace::before{content:"";position:absolute;left:4px;top:6px;bottom:6px;width:1px;background:var(--hairline)}
.index-trace__item{position:relative;display:block;padding:7px 0;transition:color 140ms var(--ease)}
.index-trace__item::before{
  content:"";position:absolute;left:-18px;top:50%;width:7px;height:7px;margin-top:-3.5px;
  border-radius:50%;background:var(--turf);border:1px solid var(--hairline-strong);
  transition:background-color 140ms var(--ease),border-color 140ms var(--ease);
}
.index-trace__item:hover{color:var(--line)}
.index-trace__item.is-active{color:var(--cyan)}
.index-trace__item.is-active::before{background:var(--cyan);border-color:var(--cyan)}

.data-table{width:100%;font-family:var(--font-condensed);font-size:14px;line-height:1.35}
.data-table th{
  padding:10px 12px;text-align:left;font-size:11px;font-weight:500;
  letter-spacing:.12em;color:var(--muted);border-bottom:1px solid var(--hairline-strong);
}
.data-table td{padding:10px 12px;border-bottom:1px solid var(--hairline);font-variant-numeric:tabular-nums}
.data-table tbody tr{transition:background-color 140ms var(--ease)}
.data-table tbody tr:hover{background:rgba(19,46,38,.7)}
.data-table .is-zone-uefa{box-shadow:inset 3px 0 0 var(--amber)}
.data-table .is-zone-drop{box-shadow:inset 3px 0 0 var(--orange)}

/* 13 · 筛选与折叠 ---------------------------------------------------------- */
.chip-bar{display:flex;flex-wrap:wrap;gap:8px}
.chip{
  display:inline-flex;align-items:center;
  padding:7px 14px;border:1px solid var(--hairline);
  font-size:12.5px;letter-spacing:.08em;color:rgba(232,244,241,.8);
  transition:border-color 140ms var(--ease),color 140ms var(--ease),background-color 140ms var(--ease);
}
.chip:hover{border-color:var(--cyan);color:var(--line)}
.chip[aria-pressed="true"],.chip[aria-selected="true"]{border-color:var(--cyan);color:var(--cyan);background:rgba(62,242,200,.08)}
.chip[aria-pressed="true"]::before{
  content:"";display:inline-block;width:6px;height:6px;margin-right:8px;
  border-radius:50%;background:var(--cyan);
}

details{border-bottom:1px solid var(--hairline)}
details summary{
  display:flex;justify-content:space-between;gap:16px;align-items:baseline;
  padding:16px 0;font-size:16px;font-weight:400;cursor:pointer;list-style:none;
}
details summary::-webkit-details-marker{display:none}
details summary::after{content:"+";font-family:var(--font-num);color:var(--cyan)}
details[open] summary::after{content:"–"}
details[open] .details__body{padding-bottom:18px}
.details__body{color:rgba(232,244,241,.78);font-size:15.5px}

/* 14 · 图片容器 ------------------------------------------------------------ */
.media{
  position:relative;overflow:hidden;
  aspect-ratio:var(--media-ratio,16/9);
  background:var(--ink);border:1px solid var(--hairline);
}
.media > img,.media > video{width:100%;height:100%;object-fit:cover}
.media--turf{background-image:repeating-linear-gradient(90deg,rgba(232,244,241,.05) 0 64px,transparent 64px 128px)}
.media--home::after,.media--away::after{content:"";position:absolute;inset:0;pointer-events:none}
.media--home::after{background:linear-gradient(180deg,rgba(255,90,60,.16),rgba(11,31,26,.72))}
.media--away::after{background:linear-gradient(180deg,rgba(123,140,255,.16),rgba(6,17,14,.75))}
.media--tunnel{--media-ratio:21/9}
.media--stand{--media-ratio:3/2}
.media--empty::before{
  content:attr(data-label);position:absolute;inset:0;
  display:grid;place-items:center;
  font-size:12px;letter-spacing:.16em;color:rgba(122,154,144,.7);
}
.media__cap{
  position:absolute;left:14px;bottom:12px;z-index:2;
  font-size:11px;letter-spacing:.14em;color:rgba(232,244,241,.84);
}
.media__tag{
  position:absolute;right:12px;top:12px;z-index:2;
  font-family:var(--font-num);font-size:11px;letter-spacing:.12em;color:var(--cyan);
}

/* 15 · 响应式 -------------------------------------------------------------- */
@media (max-width:1023px){
  .footer-grid{grid-template-columns:repeat(2,minmax(0,1fr));row-gap:34px}
  .footer-col:nth-child(3){padding-left:0;border-left:0}
  .footer-col:nth-child(2n){padding-right:0}
}

@media (max-width:899px){
  :root{--gutter:16px}
  #main-content{scroll-margin-top:120px}

  .nav-toggle{display:inline-flex}
  .header-inner{padding:10px var(--gutter);gap:12px}
  .brand__name{font-size:16px}
  .brand__sub,.brand__round{display:none}

  .primary-nav{
    position:fixed;left:0;right:0;bottom:0;z-index:130;
    display:block;max-height:76vh;overflow-y:auto;
    padding:20px var(--gutter) calc(22px + env(safe-area-inset-bottom,0px));
    background:var(--ink);border-top:1px solid var(--cyan);
    transform:translateY(102%);visibility:hidden;pointer-events:none;
    transition:transform 180ms var(--ease),visibility 0s linear 180ms;
  }
  .primary-nav[data-open]{
    transform:translateY(0);visibility:visible;pointer-events:auto;
    transition:transform 180ms var(--ease),visibility 0s linear 0s;
  }
  .primary-nav__title{
    display:block;margin-bottom:12px;
    font-size:11px;letter-spacing:.16em;color:var(--muted);
  }
  .primary-nav__list{display:block}
  .primary-nav__list > li{display:block;border-bottom:1px solid var(--hairline)}
  .primary-nav__list > li + li{border-left:0}
  .nav-link{display:flex;align-items:center;justify-content:space-between;padding:15px 4px;font-size:16px;letter-spacing:.08em}
  .nav-link:hover{background:transparent}
  .nav-link[aria-current="page"]{color:var(--cyan)}
  .nav-link[aria-current="page"]::after{left:0;right:auto;top:8px;bottom:8px;width:2px;height:auto;transform:scaleY(1)}
  .nav-link::before{display:none}

  .season-rail{height:52px}
  .season-rail__label,.season-rail__readout{display:none}
  .season-track{padding:10px 0}
  .season-track__node{width:28px;height:28px;font-size:11px}

  .grid{grid-template-columns:repeat(4,minmax(0,1fr))}
  .grid > [class*="col-"]{grid-column:1 / -1}
  .chapter{padding-top:56px}
  .chapter__lead{font-size:15.5px}
  .site-footer{margin-top:64px}
  .footer-shell{padding:40px var(--gutter) 22px}
}

@media (max-width:639px){
  .footer-masthead{flex-direction:column;align-items:flex-start;gap:18px}
  .footer-grid{grid-template-columns:1fr;row-gap:28px}
  .footer-col{padding:0;border-left:0}
  .footer-bottom{flex-direction:column;align-items:flex-start;gap:8px}
  .display-skew{font-size:clamp(56px,14vw,96px)}
}

/* 16 · 动效降级 ------------------------------------------------------------ */
@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{
    animation-duration:.001ms!important;
    animation-iteration-count:1!important;
    transition-duration:.001ms!important;
    scroll-behavior:auto!important;
  }
  .rule::after{transform:scaleX(1)}
  .nav-link::after{transform:scaleX(1)}
}