/* =============================================================
   博奥赛场 · 共享样式 /assets/site.css
   赛场夜灯基底 / 荧光绿单点强调 / 精密网格与斜切
   ============================================================= */

/* ---------- 1. reset ---------- */
*,*::before,*::after{box-sizing:border-box;}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;}
body{margin:0;}
h1,h2,h3,h4,h5,h6,p,ul,ol,li,figure,blockquote,dl,dd{margin:0;}
ul,ol{padding:0;list-style:none;}
img,svg,video{display:block;max-width:100%;}
button,input,select,textarea{font:inherit;color:inherit;}
button{background:none;border:0;padding:0;cursor:pointer;}
a{color:inherit;text-decoration:none;}
table{border-collapse:collapse;border-spacing:0;}
[hidden]{display:none !important;}

/* ---------- 2. 变量 ---------- */
:root{
  --night-900:#050B18;
  --navy-800:#0A1730;
  --navy-700:#12244A;
  --steel-600:#2C4A72;
  --steel-400:#6C86A8;
  --mist-200:#C3D2E6;
  --paper-050:#F2F6FC;
  --ink-950:#0B1220;
  --lime-400:#B8FF3D;
  --lime-600:#86C61A;
  --ember-500:#FF5A2B;
  --amber-400:#FFC24B;

  --shell:1240px;
  --gutter:clamp(16px,4vw,40px);
  --header-h:76px;
  --line:rgba(44,74,114,.6);
  --line-soft:rgba(44,74,114,.35);
  --measure:700px;

  --font-sans:"HarmonyOS Sans SC","Source Han Sans SC","Noto Sans SC","PingFang SC","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",sans-serif;
  --font-mono:"JetBrains Mono","IBM Plex Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
  --ease:cubic-bezier(.22,.61,.36,1);
}

/* ---------- 3. 基础排版 ---------- */
body{
  background:var(--night-900);
  color:var(--mist-200);
  font-family:var(--font-sans);
  font-size:16px;
  line-height:1.8;
  letter-spacing:.005em;
  overflow-x:hidden;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
:focus{outline:none;}
:focus-visible{outline:2px solid var(--lime-400);outline-offset:3px;border-radius:2px;}
::selection{background:var(--lime-400);color:var(--night-900);}

.container{width:100%;max-width:var(--shell);margin-inline:auto;padding-inline:var(--gutter);}
.page-main{padding-top:var(--header-h);}
.page-main--flush{padding-top:0;}
.is-locked{overflow:hidden;}
.rule{height:1px;border:0;margin:0;background:var(--line);}
.slash{display:block;height:12px;border:0;margin:0;transform:skewY(-3deg);
  background:linear-gradient(90deg,var(--lime-400) 0 26%,var(--steel-600) 26% 100%);}
.data-mono{font-family:var(--font-mono);font-variant-numeric:tabular-nums;letter-spacing:-.01em;}
.copy-ghost{position:fixed;top:0;left:-9999px;opacity:0;pointer-events:none;}

/* ---------- 4. 跳转链接与进度条 ---------- */
.skip-link{position:fixed;left:var(--gutter);top:-88px;z-index:130;
  background:var(--lime-400);color:var(--night-900);font-size:14px;font-weight:600;
  padding:10px 18px;border-radius:2px;transition:top .2s var(--ease);}
.skip-link:focus{top:14px;}
.scroll-progress{position:fixed;top:0;left:0;height:2px;width:0;z-index:120;
  background:linear-gradient(90deg,var(--lime-600),var(--lime-400));pointer-events:none;}

/* ---------- 5. 头部 ---------- */
.site-header{
  position:fixed;inset:0 0 auto 0;z-index:60;
  color:var(--paper-050);
  background:linear-gradient(180deg,rgba(5,11,24,.92),rgba(5,11,24,0));
  border-bottom:1px solid transparent;
  transition:background-color .24s var(--ease),border-color .24s var(--ease);
}
.site-header[data-scrolled="true"]{
  background:rgba(10,23,48,.97);
  border-bottom-color:var(--steel-600);
}
.sh-inner{display:flex;align-items:center;gap:clamp(10px,2vw,24px);height:var(--header-h);}
.sh-brand{display:flex;align-items:center;gap:14px;min-width:0;}

.sh-brand-link{display:flex;align-items:center;gap:10px;}
.sh-brand-mark{width:12px;height:12px;background:var(--lime-400);transform:skewX(-12deg);
  box-shadow:0 0 0 1px rgba(184,255,61,.35),0 0 18px rgba(184,255,61,.35);}
.sh-brand-text{display:flex;flex-direction:column;line-height:1.15;}
.sh-brand-name{font-size:17px;font-weight:600;letter-spacing:.02em;color:var(--paper-050);}
.sh-brand-sub{font-family:var(--font-mono);font-size:10px;letter-spacing:.2em;
  text-transform:uppercase;color:var(--steel-400);}

/* 赛区切换器 */
.sh-zone{overflow:hidden;}
.sh-zone-toggle{display:inline-flex;align-items:center;gap:8px;padding:6px 2px 6px 12px;
  border-left:1px solid var(--steel-600);font-size:12px;letter-spacing:.08em;color:var(--mist-200);}
.sh-zone-key{font-family:var(--font-mono);font-size:10px;letter-spacing:.2em;
  text-transform:uppercase;color:var(--steel-400);}
.sh-zone-value{font-weight:600;color:var(--paper-050);}
.sh-caret{width:0;height:0;border-left:4px solid transparent;border-right:4px solid transparent;
  border-top:5px solid var(--steel-400);transition:transform .2s var(--ease);}
.sh-zone-toggle[aria-expanded="true"] .sh-caret{transform:rotate(180deg);}
.sh-zone-panel{position:absolute;z-index:70;
  top:calc(var(--header-h) + 8px);
  left:max(var(--gutter),calc((100% - var(--shell)) / 2 + var(--gutter)));
  min-width:230px;padding:16px;background:var(--navy-700);border:1px solid var(--steel-600);
  border-left:2px solid var(--lime-400);}
.sh-zone-hint{font-family:var(--font-mono);font-size:10px;letter-spacing:.18em;
  text-transform:uppercase;color:var(--steel-400);margin-bottom:12px;}
.sh-zone-list{display:grid;gap:2px;}
.sh-zone-item{display:flex;width:100%;align-items:center;gap:8px;padding:8px 10px;
  font-size:14px;color:var(--mist-200);border:1px solid transparent;text-align:left;
  transition:color .18s var(--ease),border-color .18s var(--ease);}
.sh-zone-item::before{content:"";width:6px;height:6px;background:transparent;
  border:1px solid var(--steel-600);}
.sh-zone-item:hover{color:var(--paper-050);border-color:var(--steel-600);}
.sh-zone-item[aria-pressed="true"]{color:var(--lime-400);border-color:rgba(184,255,61,.5);}
.sh-zone-item[aria-pressed="true"]::before{background:var(--lime-400);border-color:var(--lime-400);}

/* 主导航 */
.sh-nav{margin-left:auto;}
.sh-nav-list{display:flex;align-items:center;gap:2px;counter-reset:navidx;}
.sh-nav-link{display:block;padding:8px 10px;font-size:14px;letter-spacing:.04em;
  color:var(--mist-200);border-bottom:2px solid transparent;
  transition:color .2s var(--ease),border-color .2s var(--ease);}
.sh-nav-link::before{counter-increment:navidx;content:counter(navidx,decimal-leading-zero);
  font-family:var(--font-mono);font-size:10px;letter-spacing:.12em;
  color:var(--steel-400);margin-right:8px;vertical-align:2px;}
.sh-nav-link:hover{color:var(--lime-400);}
.sh-nav-link[aria-current="page"]{color:var(--lime-400);border-bottom-color:var(--lime-400);}

/* 工具区 */
.sh-tools{display:flex;align-items:center;gap:10px;}
.sh-tool{overflow:hidden;white-space:nowrap;font-size:13px;letter-spacing:.08em;
  color:var(--mist-200);padding:8px 12px;border:1px solid var(--steel-600);border-radius:2px;
  transition:color .2s var(--ease),border-color .2s var(--ease);}
.sh-tool:hover{color:var(--lime-400);border-color:var(--lime-400);}
.sh-cta{white-space:nowrap;font-size:13px;font-weight:600;letter-spacing:.06em;
  padding:9px 16px;border-radius:2px;background:var(--lime-400);color:var(--night-900);
  transition:background-color .2s var(--ease);}
.sh-cta:hover{background:var(--lime-600);}
.sh-toggle{display:none;width:40px;height:40px;align-items:center;justify-content:center;
  border:1px solid var(--steel-600);border-radius:2px;color:var(--paper-050);}
.sh-toggle-bars{position:relative;display:block;width:18px;height:12px;}
.sh-toggle-bars::before,.sh-toggle-bars::after{content:"";position:absolute;left:0;right:0;
  height:2px;background:currentColor;transition:transform .24s var(--ease),top .24s var(--ease),bottom .24s var(--ease);}
.sh-toggle-bars::before{top:0;}
.sh-toggle-bars::after{bottom:0;}
.sh-toggle[aria-expanded="true"] .sh-toggle-bars::before{top:5px;transform:rotate(45deg);}
.sh-toggle[aria-expanded="true"] .sh-toggle-bars::after{bottom:5px;transform:rotate(-45deg);}

/* 次要控件收起 */
.sh-secondary{max-width:340px;opacity:1;visibility:visible;
  transition:max-width .24s var(--ease),opacity .18s var(--ease),visibility .24s var(--ease);}
.site-header[data-scrolled="true"] .sh-secondary{
  max-width:0;opacity:0;visibility:hidden;pointer-events:none;}

/* 快捷筛选面板 */
.sh-filter-panel{position:absolute;left:0;right:0;top:var(--header-h);
  background:rgba(10,23,48,.97);border-top:1px solid var(--steel-600);
  border-bottom:1px solid var(--steel-600);padding:20px 0;}
.sh-filter-inner{display:flex;flex-wrap:wrap;align-items:center;gap:12px 20px;}
.sh-filter-label{font-family:var(--font-mono);font-size:11px;letter-spacing:.2em;
  text-transform:uppercase;color:var(--steel-400);}

/* ---------- 6. 页脚 ---------- */
.site-footer{position:relative;background:var(--night-900);color:var(--mist-200);
  border-top:1px solid var(--steel-600);padding:clamp(40px,6vw,72px) 0 26px;}
.site-footer::before{content:"";position:absolute;inset:0 0 auto 0;height:3px;
  background:linear-gradient(90deg,var(--lime-400) 0 38%,var(--ember-500) 38% 44%,transparent 44%);}
.sf-top{display:flex;flex-wrap:wrap;align-items:flex-end;justify-content:space-between;
  gap:20px;padding-bottom:26px;border-bottom:1px solid var(--line);}
.sf-mark{font-size:clamp(28px,4vw,44px);font-weight:200;line-height:1.05;
  letter-spacing:-.01em;color:var(--paper-050);}
.sf-desc{max-width:48ch;font-size:14px;line-height:1.75;color:var(--steel-400);}
.sf-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:32px;
  padding:36px 0;border-bottom:1px solid var(--line);}
.sf-title{font-family:var(--font-mono);font-size:11px;font-weight:500;letter-spacing:.2em;
  text-transform:uppercase;color:var(--steel-400);margin-bottom:16px;}
.sf-list{display:grid;gap:10px;}
.sf-link{display:inline-block;font-size:14px;color:var(--mist-200);
  border-bottom:1px solid transparent;transition:color .18s var(--ease),border-color .18s var(--ease);}
.sf-link:hover{color:var(--lime-400);border-bottom-color:var(--lime-400);}
.sf-link--mono{font-family:var(--font-mono);font-size:13px;font-variant-numeric:tabular-nums;}
.sf-text-strong{color:var(--paper-050);}
.sf-text{font-size:14px;color:var(--steel-400);}
.sf-note{display:block;font-size:12px;line-height:1.7;color:var(--steel-400);}
.sf-icp{display:inline-block;font-family:var(--font-mono);font-size:12px;color:var(--steel-400);}
.sf-contact-row{display:flex;flex-wrap:wrap;align-items:center;gap:10px;}
.copy-btn{font-family:var(--font-mono);font-size:11px;letter-spacing:.08em;
  color:var(--lime-400);border:1px solid var(--steel-600);border-radius:2px;padding:2px 8px;
  transition:color .18s var(--ease),border-color .18s var(--ease);}
.copy-btn:hover{border-color:var(--lime-400);}
.sf-bottom{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;
  gap:12px 24px;padding-top:20px;}
.sf-copy{font-family:var(--font-mono);font-size:12px;letter-spacing:.04em;color:var(--steel-400);}
.sf-legal{display:flex;flex-wrap:wrap;gap:18px;}
.sf-legal .sf-link{font-size:12px;color:var(--steel-400);}

/* ---------- 7. 按钮 ---------- */
.btn{display:inline-flex;align-items:center;gap:8px;font-size:14px;font-weight:600;
  letter-spacing:.04em;padding:12px 22px;border:1px solid transparent;border-radius:2px;
  transition:background-color .2s var(--ease),color .2s var(--ease),border-color .2s var(--ease);}
.btn--primary{background:var(--lime-400);color:var(--night-900);}
.btn--primary:hover{background:var(--lime-600);}
.btn--ghost{border-color:var(--steel-600);color:var(--paper-050);}
.btn--ghost:hover{border-color:var(--lime-400);color:var(--lime-400);}
.btn--quiet{padding:10px 0;color:var(--lime-400);
  border-bottom:1px solid var(--steel-600);border-radius:0;}
.btn--quiet:hover{border-bottom-color:var(--lime-400);}

/* ---------- 8. 面包屑与正文 ---------- */
.crumbs{padding:18px 0;border-bottom:1px solid var(--line-soft);}
.crumbs-list{display:flex;flex-wrap:wrap;align-items:center;gap:8px;
  font-family:var(--font-mono);font-size:11px;letter-spacing:.16em;
  text-transform:uppercase;color:var(--steel-400);}
.crumbs-list li{display:flex;align-items:center;gap:8px;}
.crumbs-list li+li::before{content:"/";color:var(--steel-600);}
.crumbs-list a:hover{color:var(--lime-400);}

.prose{max-width:var(--measure);font-size:17px;line-height:1.85;color:var(--mist-200);}
.prose p+p{margin-top:1.1em;}
.prose strong{color:var(--paper-050);font-weight:600;}

/* ---------- 9. 堆叠画板章节 ---------- */
.panel{position:relative;padding:clamp(44px,7vw,96px) 0;background:var(--navy-800);
  border-top:1px solid var(--line-soft);}
.panel--base{background:var(--night-900);}
.panel--paper{background:var(--paper-050);color:var(--ink-950);}
.panel-head{display:grid;gap:14px;margin-bottom:clamp(24px,4vw,48px);}
.panel-index{font-family:var(--font-mono);font-size:12px;letter-spacing:.24em;
  text-transform:uppercase;color:var(--lime-400);}
.panel-title{font-size:clamp(30px,4.6vw,56px);font-weight:250;line-height:1.04;
  letter-spacing:-.02em;color:var(--paper-050);}
.panel-lede{max-width:62ch;font-size:15px;color:var(--steel-400);}
.panel--paper .panel-title,
.panel--paper .section-title,
.panel--paper .display{color:var(--ink-950);}
.panel--paper .panel-lede,
.panel--paper .section-note,
.panel--paper .note{color:#4A5A72;}
.panel--paper .panel-index,
.panel--paper .kicker{color:#3C6E1E;}
.panel--paper .note{border-left-color:#86C61A;}
.panel--paper .stat-value{color:#3C6E1E;}
.panel--paper .data-mono{color:var(--ink-950);}

.display{font-size:clamp(44px,8vw,128px);font-weight:200;line-height:.98;
  letter-spacing:-.02em;color:var(--paper-050);}
.kicker{font-family:var(--font-mono);font-size:12px;letter-spacing:.22em;
  text-transform:uppercase;color:var(--lime-400);}
.section{padding:clamp(36px,6vw,80px) 0;}
.section-head{display:flex;flex-wrap:wrap;align-items:baseline;justify-content:space-between;
  gap:12px 20px;padding-bottom:14px;margin-bottom:26px;border-bottom:1px solid var(--line);}
.section-title{font-size:clamp(20px,2.4vw,28px);font-weight:300;letter-spacing:-.01em;
  color:var(--paper-050);}
.section-note{font-family:var(--font-mono);font-size:11px;letter-spacing:.18em;
  text-transform:uppercase;color:var(--steel-400);}

/* ---------- 10. 网格 ---------- */
.grid{display:grid;gap:clamp(20px,3vw,36px);}
.grid--8-3{grid-template-columns:minmax(0,8fr) minmax(0,3fr);}
.grid--3up{grid-template-columns:repeat(3,minmax(0,1fr));}
.grid--2up{grid-template-columns:repeat(2,minmax(0,1fr));}
.col-main{min-width:0;}
.col-aside{min-width:0;}

/* ---------- 11. 旁注 ---------- */
.note{border-left:2px solid var(--lime-400);padding:12px 0 12px 16px;
  font-size:14px;line-height:1.75;color:var(--steel-400);}
.note--aside{border-left-color:var(--steel-600);}
.note--warn{border-left-color:var(--ember-500);color:var(--mist-200);}

/* ---------- 12. 数据组件 ---------- */
.stat{display:grid;gap:6px;padding:18px 0;border-top:1px solid var(--line);}
.stat-value{font-family:var(--font-mono);font-variant-numeric:tabular-nums;
  font-size:clamp(28px,4vw,44px);font-weight:600;line-height:1.05;
  letter-spacing:-.02em;color:var(--lime-400);}
.stat-label{font-family:var(--font-mono);font-size:11px;letter-spacing:.16em;
  text-transform:uppercase;color:var(--steel-400);}

/* ---------- 13. 筛选标签 ---------- */
.chips{display:flex;flex-wrap:wrap;gap:8px;}
.chip{display:inline-flex;align-items:center;gap:7px;font-size:13px;padding:6px 12px;
  border:1px solid var(--steel-600);border-radius:2px;color:var(--mist-200);
  transition:color .18s var(--ease),border-color .18s var(--ease),box-shadow .18s var(--ease);}
.chip:hover{color:var(--lime-400);border-color:var(--lime-400);}
.chip[aria-pressed="true"],.chip.is-active{
  color:var(--lime-400);border-color:var(--lime-400);
  box-shadow:inset 0 0 0 1px rgba(184,255,61,.3);}
.chip[aria-pressed="true"]::before,.chip.is-active::before{
  content:"";width:6px;height:6px;background:var(--lime-400);}

/* ---------- 14. 分段标签页 ---------- */
.tabs{display:block;}
.tablist{display:flex;gap:0;border-bottom:1px solid var(--line);overflow-x:auto;
  scrollbar-width:thin;}
.tab{padding:12px 18px;white-space:nowrap;font-size:14px;letter-spacing:.04em;
  color:var(--steel-400);border-bottom:2px solid transparent;
  transition:color .2s var(--ease),border-color .2s var(--ease);}
.tab:hover{color:var(--paper-050);}
.tab[aria-selected="true"]{color:var(--lime-400);border-bottom-color:var(--lime-400);}
.tabpanel{padding-top:24px;}
.tabpanel:focus-visible{outline-offset:6px;}

/* ---------- 15. 时间轴 ---------- */
.timeline{display:block;}
.tl-item{display:grid;grid-template-columns:96px minmax(0,1fr);gap:16px;
  padding:16px 0;border-top:1px solid var(--line-soft);}
.tl-time{font-family:var(--font-mono);font-variant-numeric:tabular-nums;
  font-size:13px;color:var(--lime-400);}
.tl-body{font-size:14px;line-height:1.75;color:var(--mist-200);}

/* ---------- 16. 数据表 ---------- */
.table-wrap{overflow-x:auto;border-top:1px solid var(--line);}
.table{width:100%;min-width:520px;font-size:14px;}
.table th{font-family:var(--font-mono);font-size:11px;font-weight:500;letter-spacing:.16em;
  text-transform:uppercase;color:var(--steel-400);text-align:left;
  padding:12px 14px;background:rgba(18,36,74,.6);white-space:nowrap;}
.table td{padding:12px 14px;border-top:1px solid var(--line-soft);color:var(--mist-200);}
.table tbody tr:hover{background:rgba(18,36,74,.45);}

/* ---------- 17. 短标签 ---------- */
.tag{display:inline-flex;align-items:center;font-family:var(--font-mono);
  font-size:11px;letter-spacing:.08em;text-transform:uppercase;padding:3px 8px;border-radius:2px;}
.tag--lime{color:var(--lime-400);background:rgba(184,255,61,.14);border:1px solid rgba(184,255,61,.4);}
.tag--ember{color:var(--ember-500);background:rgba(255,90,43,.14);border:1px solid rgba(255,90,43,.42);}
.tag--amber{color:var(--amber-400);background:rgba(255,194,75,.14);border:1px solid rgba(255,194,75,.42);}

/* ---------- 18. 图片容器 ---------- */
.media{position:relative;overflow:hidden;border:1px solid var(--steel-600);
  background:linear-gradient(140deg,var(--navy-700),var(--night-900) 72%);}
.media img{width:100%;height:100%;object-fit:cover;}
.media::after{content:"";position:absolute;inset:0;pointer-events:none;
  background-image:linear-gradient(rgba(195,210,230,.07) 1px,transparent 1px),
    linear-gradient(90deg,rgba(195,210,230,.07) 1px,transparent 1px);
  background-size:40px 40px;}
.media--wide{aspect-ratio:16/9;}
.media--tall{aspect-ratio:4/5;}
.media--square{aspect-ratio:1/1;}
.media-caption{display:block;padding-top:10px;font-family:var(--font-mono);
  font-size:11px;letter-spacing:.12em;text-transform:uppercase;color:var(--steel-400);}

/* ---------- 19. 粘性目录 ---------- */
.toc{position:sticky;top:calc(var(--header-h) + 24px);}
.toc-list{display:grid;gap:8px;padding-left:16px;border-left:1px solid var(--steel-600);}
.toc-link{display:block;font-size:13px;line-height:1.6;color:var(--steel-400);
  transition:color .2s var(--ease);}
.toc-link:hover{color:var(--paper-050);}
.toc-link.is-active{color:var(--lime-400);}

/* ---------- 20. 进场与提示 ---------- */
.reveal{opacity:0;transform:translateY(12px);
  transition:opacity .5s var(--ease),transform .5s var(--ease);}
.reveal.is-visible{opacity:1;transform:none;}
.toast{position:fixed;left:50%;bottom:32px;z-index:140;transform:translate(-50%,14px);
  background:var(--navy-700);color:var(--paper-050);border:1px solid var(--steel-600);
  border-left:2px solid var(--lime-400);border-radius:2px;padding:10px 18px;
  font-size:13px;opacity:0;pointer-events:none;
  transition:opacity .2s var(--ease),transform .2s var(--ease);}
.toast.is-visible{opacity:1;transform:translate(-50%,0);}

/* ---------- 21. 响应式 ---------- */
@media (max-width:1080px){
  .sh-brand-sub{display:none;}
  .sh-nav-link{font-size:13px;padding:8px;}
  .sh-nav-link::before{display:none;}
}

@media (max-width:1024px){
  .grid--8-3{grid-template-columns:minmax(0,1fr);}
  .grid--3up{grid-template-columns:repeat(2,minmax(0,1fr));}
  .sf-grid{grid-template-columns:repeat(2,minmax(0,1fr));}
  .toc{position:static;}
  .toc-list{grid-auto-flow:column;grid-auto-columns:max-content;
    overflow-x:auto;border-left:0;border-bottom:1px solid var(--steel-600);
    padding:0 0 12px;}
}

@media (max-width:960px){
  :root{--header-h:64px;}
  .sh-zone,.sh-tool{display:none;}
  .sh-toggle{display:inline-flex;}
  .sh-nav{position:fixed;top:var(--header-h);left:0;right:0;bottom:0;margin-left:0;
    background:var(--night-900);border-top:1px solid var(--steel-600);
    padding:24px var(--gutter) 48px;overflow-y:auto;
    opacity:0;visibility:hidden;transform:translateY(-8px);pointer-events:none;
    transition:opacity .24s var(--ease),transform .24s var(--ease),visibility .24s var(--ease);}
  .sh-nav[data-open]{opacity:1;visibility:visible;transform:none;pointer-events:auto;}
  .sh-nav-list{display:block;}
  .sh-nav-link{font-size:22px;font-weight:300;letter-spacing:0;padding:16px 0;
    border-bottom:1px solid var(--line);}
  .sh-nav-link[aria-current="page"]{border-bottom-color:var(--lime-400);}
  .sh-filter-panel{top:var(--header-h);}
  .sh-cta{padding:8px 14px;font-size:12px;}
}

@media (max-width:680px){
  .grid--3up,.grid--2up{grid-template-columns:minmax(0,1fr);}
  .sf-grid{grid-template-columns:minmax(0,1fr);gap:28px;}
  .sf-top{align-items:flex-start;}
  .tl-item{grid-template-columns:68px minmax(0,1fr);gap:12px;}
  .prose{font-size:16px;}
  .sf-bottom{flex-direction:column;align-items:flex-start;}
}

/* ---------- 22. 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;
    scroll-behavior:auto !important;}
  .reveal{opacity:1;transform:none;}
  .toast{transform:translate(-50%,0);}
}