/* ==========================================================================
   飞亚体育入口 · 共享站点样式 /assets/site.css
   暖沙纸 + 炭黑骨架 + 蓝绿/信号橙/高亮青蓝，技术蓝图网格与胶囊浮岛
   ========================================================================== */

/* ---------- 1. 设计变量 ---------- */
:root{
  --ink:#14100D;
  --ink-soft:#3A2A20;
  --paper:#E8DCC8;
  --paper-light:#F7F1E6;
  --teal:#0F6B5C;
  --orange:#FF6B2C;
  --cyan:#2DD4BF;
  --muted:#6B5A4B;
  --deep:#083B35;

  --line:rgba(20,16,13,.13);
  --line-strong:rgba(20,16,13,.26);
  --line-invert:rgba(247,241,230,.16);

  --font-sans:"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Source Han Sans SC","Noto Sans CJK SC",system-ui,-apple-system,"Segoe UI",sans-serif;
  --font-mono:"SF Mono","JetBrains Mono","Roboto Mono",ui-monospace,Menlo,Consolas,"Courier New",monospace;

  --r-xs:8px;
  --r-sm:12px;
  --r-md:18px;
  --r-lg:26px;
  --r-pill:999px;

  --shell:min(1320px, calc(100% - 2 * clamp(16px,3vw,40px)));
  --gap:clamp(14px,1.7vw,22px);

  --shadow-card:0 20px 44px -32px rgba(20,16,13,.75);
  --shadow-float:0 28px 56px -34px rgba(20,16,13,.9);

  --ease:cubic-bezier(.22,.61,.36,1);
}

/* ---------- 2. 重置 ---------- */
*,
*::before,
*::after{box-sizing:border-box;}

html{
  -webkit-text-size-adjust:100%;
  scroll-padding-top:120px;
}

body{
  margin:0;
  background-color:var(--paper-light);
  background-image:
    linear-gradient(to right, rgba(20,16,13,.032) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(20,16,13,.032) 1px, transparent 1px);
  background-size:84px 84px;
  color:var(--ink);
  font-family:var(--font-sans);
  font-size:16px;
  line-height:1.78;
  -webkit-font-smoothing:antialiased;
}

h1,h2,h3,h4,h5,h6{
  margin:0 0 .55em;
  font-weight:800;
  line-height:1.18;
  letter-spacing:-.012em;
  color:var(--ink);
}

p{margin:0 0 1em;}
p:last-child{margin-bottom:0;}

ul,ol{margin:0;padding:0;}

a{
  color:var(--teal);
  text-decoration-thickness:1px;
  text-underline-offset:3px;
}

img,svg{display:block;max-width:100%;}

button{font:inherit;color:inherit;}

hr{
  border:0;
  border-top:1px solid var(--line);
  margin:var(--gap) 0;
}

::selection{
  background:var(--teal);
  color:var(--paper-light);
}

/* ---------- 3. 可访问性基线 ---------- */
:focus-visible{
  outline:3px solid var(--orange);
  outline-offset:3px;
}

.skip-link{
  position:absolute;
  left:50%;
  top:-120px;
  transform:translateX(-50%);
  z-index:300;
  padding:12px 24px;
  border-radius:var(--r-pill);
  background:var(--ink);
  color:var(--paper-light);
  font-size:14px;
  font-weight:700;
  text-decoration:none;
  box-shadow:var(--shadow-float);
  transition:top .18s var(--ease);
}

.skip-link:focus{
  top:14px;
}

.scroll-progress{
  position:fixed;
  inset:0 0 auto 0;
  height:3px;
  width:100%;
  transform:scaleX(0);
  transform-origin:0 50%;
  background:linear-gradient(90deg,var(--teal) 0%,var(--cyan) 58%,var(--orange) 100%);
  z-index:200;
  pointer-events:none;
}

/* ---------- 4. 头部：悬浮胶囊导航岛 ---------- */
.site-header{
  position:sticky;
  top:0;
  z-index:90;
  padding:clamp(10px,1.6vw,18px) clamp(12px,2.6vw,36px) 0;
  background:linear-gradient(180deg,
    rgba(247,241,230,.97) 0%,
    rgba(247,241,230,.9) 62%,
    rgba(247,241,230,.55) 100%);
  -webkit-backdrop-filter:blur(9px);
  backdrop-filter:blur(9px);
}

.header-shell{
  width:min(1320px,100%);
  margin-inline:auto;
  display:flex;
  flex-direction:column;
}

.header-island{
  position:relative;
  display:flex;
  align-items:center;
  gap:clamp(10px,2vw,26px);
  padding:10px 12px 10px 16px;
  border-radius:var(--r-pill);
  background:linear-gradient(150deg, rgba(20,16,13,.97) 0%, rgba(58,42,32,.97) 100%);
  border:1px solid rgba(247,241,230,.16);
  box-shadow:var(--shadow-float), inset 0 1px 0 rgba(247,241,230,.1);
}

.brand{
  display:inline-flex;
  align-items:center;
  gap:11px;
  flex:none;
  padding:4px 8px 4px 4px;
  border-radius:var(--r-pill);
  color:var(--paper-light);
  text-decoration:none;
  transition:opacity .18s var(--ease), background-color .18s var(--ease);
}

.brand:hover{
  opacity:.88;
  background:rgba(247,241,230,.07);
}

.brand--footer{
  margin-bottom:18px;
  padding:0;
  background:none;
}

.brand--footer:hover{background:none;}

.brand-mark{
  position:relative;
  flex:none;
  width:36px;
  height:36px;
  border-radius:50%;
  border:1px solid rgba(45,212,191,.62);
}

.brand-mark::before{
  content:"";
  position:absolute;
  inset:8px;
  border-radius:50%;
  border:1px solid rgba(247,241,230,.5);
}

.brand-mark::after{
  content:"";
  position:absolute;
  left:50%;
  top:50%;
  width:6px;
  height:6px;
  border-radius:50%;
  background:var(--orange);
  transform:translate(-50%,-50%);
}

.brand-text{
  display:flex;
  flex-direction:column;
  min-width:0;
}

.brand-name{
  display:block;
  font-size:17px;
  font-weight:800;
  line-height:1.1;
  letter-spacing:.02em;
  color:var(--paper-light);
}

.brand-sub{
  display:block;
  margin-top:3px;
  font-family:var(--font-mono);
  font-size:10.5px;
  line-height:1.2;
  letter-spacing:.14em;
  color:rgba(247,241,230,.52);
}

.nav{
  display:flex;
  align-items:center;
  margin-left:auto;
}

.nav-list{
  display:flex;
  align-items:center;
  gap:2px;
  flex-wrap:wrap;
}

.nav-link{
  position:relative;
  display:inline-flex;
  align-items:center;
  gap:7px;
  padding:9px 14px;
  border-radius:var(--r-pill);
  font-size:14.5px;
  font-weight:600;
  line-height:1.2;
  white-space:nowrap;
  color:rgba(247,241,230,.78);
  text-decoration:none;
  transition:background-color .18s var(--ease), color .18s var(--ease);
}

.nav-link:hover{
  background:rgba(247,241,230,.11);
  color:var(--paper-light);
}

.nav-link--teal:hover{
  background:rgba(15,107,92,.55);
  color:#EAF7F4;
}

.nav-link--orange:hover{
  background:rgba(255,107,44,.3);
  color:#FFE7DC;
}

.nav-link[aria-current="page"]{
  background:var(--teal);
  color:var(--paper-light);
  box-shadow:inset 0 0 0 1px rgba(45,212,191,.42);
}

.nav-link[aria-current="page"]::after{
  content:"";
  position:absolute;
  left:50%;
  bottom:2px;
  width:14px;
  height:2px;
  border-radius:2px;
  background:var(--cyan);
  transform:translateX(-50%);
}

.nav-badge{
  flex:none;
  width:6px;
  height:6px;
  border-radius:50%;
}

.nav-badge--teal{
  background:var(--cyan);
  box-shadow:0 0 0 3px rgba(45,212,191,.22);
}

.nav-badge--orange{
  background:var(--orange);
  box-shadow:0 0 0 3px rgba(255,107,44,.22);
}

.nav-toggle{
  display:none;
  align-items:center;
  gap:9px;
  margin-left:auto;
  padding:9px 16px;
  border-radius:var(--r-pill);
  background:rgba(247,241,230,.09);
  border:1px solid rgba(247,241,230,.24);
  color:var(--paper-light);
  font-size:14px;
  font-weight:700;
  cursor:pointer;
  transition:background-color .18s var(--ease), border-color .18s var(--ease);
}

.nav-toggle:hover{
  background:rgba(247,241,230,.18);
  border-color:rgba(45,212,191,.5);
}

.nav-toggle-bars{
  display:grid;
  gap:4px;
  width:16px;
}

.nav-toggle-bars i{
  display:block;
  height:2px;
  border-radius:2px;
  background:currentColor;
  transition:transform .2s var(--ease), opacity .2s var(--ease);
}

.nav-toggle[aria-expanded="true"] .nav-toggle-bars i:nth-child(1){
  transform:translateY(6px) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .nav-toggle-bars i:nth-child(2){
  opacity:0;
}

.nav-toggle[aria-expanded="true"] .nav-toggle-bars i:nth-child(3){
  transform:translateY(-6px) rotate(-45deg);
}

.nav-toggle-text{
  letter-spacing:.06em;
}

/* ---------- 5. 赛事日快速通道 ---------- */
.quick-rail{
  display:flex;
  align-items:center;
  flex-wrap:wrap;
  gap:10px;
  width:fit-content;
  margin:10px auto 0;
  padding:6px 8px 6px 14px;
  border-radius:var(--r-pill);
  background:rgba(247,241,230,.78);
  border:1px solid var(--line);
  box-shadow:0 12px 26px -24px rgba(20,16,13,.8);
  -webkit-backdrop-filter:blur(6px);
  backdrop-filter:blur(6px);
}

.quick-rail-label{
  display:inline-flex;
  align-items:center;
  gap:8px;
  font-size:12px;
  font-weight:700;
  letter-spacing:.06em;
  color:var(--ink-soft);
}

.quick-dot{
  width:7px;
  height:7px;
  border-radius:50%;
  background:var(--orange);
  box-shadow:0 0 0 3px rgba(255,107,44,.2);
}

.quick-rail-list{
  display:flex;
  align-items:center;
  flex-wrap:wrap;
  gap:4px;
}

.quick-rail-link{
  display:inline-block;
  padding:4px 12px;
  border-radius:var(--r-pill);
  border:1px solid transparent;
  font-size:12px;
  font-weight:600;
  color:var(--ink-soft);
  text-decoration:none;
  transition:background-color .16s var(--ease), color .16s var(--ease), border-color .16s var(--ease);
}

.quick-rail-link:hover{
  background:var(--teal);
  border-color:var(--teal);
  color:var(--paper-light);
}

/* ---------- 6. 页脚：深色数据面板 ---------- */
.site-footer{
  position:relative;
  overflow:hidden;
  margin-top:clamp(48px,7vw,96px);
  padding:clamp(40px,6vw,74px) clamp(16px,3vw,40px) clamp(20px,3vw,28px);
  background-color:var(--ink-soft);
  background-image:
    linear-gradient(to right, rgba(247,241,230,.055) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(247,241,230,.055) 1px, transparent 1px),
    radial-gradient(120% 90% at 88% -14%, rgba(15,107,92,.62) 0%, rgba(15,107,92,0) 60%),
    radial-gradient(90% 70% at 4% 108%, rgba(255,107,44,.16) 0%, rgba(255,107,44,0) 58%);
  background-size:74px 74px, 74px 74px, 100% 100%, 100% 100%;
  color:rgba(247,241,230,.78);
}

.footer-stamp{
  position:absolute;
  right:clamp(14px,3vw,44px);
  top:clamp(18px,3vw,34px);
  font-family:var(--font-mono);
  font-size:clamp(44px,7vw,92px);
  font-weight:700;
  line-height:1;
  letter-spacing:-.03em;
  color:rgba(45,212,191,.14);
  pointer-events:none;
  user-select:none;
}

.footer-shell{
  position:relative;
  width:min(1320px,100%);
  margin-inline:auto;
  z-index:1;
}

.footer-top{
  display:grid;
  grid-template-columns:minmax(0,1.55fr) minmax(0,.85fr) minmax(0,1.1fr);
  gap:clamp(22px,4vw,54px);
}

.footer-brand{min-width:0;}

.footer-summary{
  max-width:34ch;
  margin:0 0 16px;
  font-size:14.5px;
  line-height:1.8;
  color:rgba(247,241,230,.72);
}

.footer-tags{
  display:flex;
  flex-wrap:wrap;
  gap:8px;
}

.footer-tag{
  padding:5px 12px;
  border-radius:var(--r-pill);
  border:1px solid rgba(45,212,191,.34);
  font-family:var(--font-mono);
  font-size:11.5px;
  letter-spacing:.05em;
  color:var(--cyan);
}

.footer-heading{
  margin:0 0 14px;
  font-family:var(--font-mono);
  font-size:11.5px;
  font-weight:600;
  letter-spacing:.2em;
  color:rgba(247,241,230,.45);
}

.footer-list{
  display:grid;
  gap:9px;
  font-size:14.5px;
  line-height:1.6;
}

.footer-list a{
  color:rgba(247,241,230,.82);
  text-decoration:none;
  border-bottom:1px solid transparent;
  transition:color .16s var(--ease), border-color .16s var(--ease);
}

.footer-list a:hover{
  color:var(--cyan);
  border-bottom-color:rgba(45,212,191,.55);
}

.footer-list--contact li{
  display:grid;
  grid-template-columns:44px minmax(0,1fr);
  gap:10px;
  align-items:start;
}

.footer-contact-key{
  padding-top:2px;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.1em;
  color:rgba(247,241,230,.4);
}

.footer-contact-value{
  color:rgba(247,241,230,.8);
  word-break:break-word;
}

.footer-meta{
  margin-top:clamp(26px,4vw,44px);
  padding-top:16px;
  border-top:1px solid var(--line-invert);
}

.footer-note{
  margin:0;
  font-family:var(--font-mono);
  font-size:12px;
  line-height:1.9;
  letter-spacing:.02em;
  color:rgba(247,241,230,.56);
}

.footer-bottom{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:12px 24px;
  margin-top:14px;
  padding-top:14px;
  border-top:1px solid rgba(247,241,230,.1);
}

.footer-copy{
  margin:0;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.02em;
  color:rgba(247,241,230,.5);
}

.footer-legal{
  display:flex;
  flex-wrap:wrap;
  gap:8px 20px;
  font-size:12.5px;
}

.footer-legal a{
  color:rgba(247,241,230,.68);
  text-decoration:none;
  transition:color .16s var(--ease);
}

.footer-legal a:hover{color:var(--cyan);}

/* ---------- 7. 布局容器 ---------- */
.shell{
  width:var(--shell);
  margin-inline:auto;
}

.section{
  padding-block:clamp(38px,5.6vw,76px);
}

.split{
  display:grid;
  grid-template-columns:minmax(0,1.05fr) minmax(0,.95fr);
  gap:clamp(22px,4vw,56px);
  align-items:center;
}

.grid-12{
  display:grid;
  grid-template-columns:repeat(12,minmax(0,1fr));
  gap:var(--gap);
}

.span-3{grid-column:span 3;}
.span-4{grid-column:span 4;}
.span-6{grid-column:span 6;}
.span-8{grid-column:span 8;}
.span-9{grid-column:span 9;}
.span-12{grid-column:span 12;}

/* ---------- 8. 排版组件 ---------- */
.prose{
  max-width:38em;
  font-size:17px;
  line-height:1.8;
  color:var(--ink-soft);
}

.prose h2,
.prose h3{color:var(--ink);}

.prose ul,
.prose ol{
  margin:0 0 1em;
  padding-left:1.15em;
  list-style:disc;
}

.prose li{margin-bottom:.35em;}

.metric{
  display:block;
  font-family:var(--font-mono);
  font-weight:700;
  line-height:.95;
  letter-spacing:-.035em;
  color:var(--ink);
}

.metric--xl{font-size:clamp(64px,9vw,150px);}
.metric--lg{font-size:clamp(40px,5vw,76px);}
.metric--cyan{color:var(--cyan);}

.metric-label{
  display:block;
  margin-top:12px;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.16em;
  color:var(--muted);
}

/* ---------- 9. 按钮 ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  padding:13px 26px;
  border:1px solid transparent;
  border-radius:var(--r-pill);
  font-size:15px;
  font-weight:700;
  line-height:1.2;
  text-decoration:none;
  cursor:pointer;
  transition:transform .18s var(--ease),
             background-color .18s var(--ease),
             color .18s var(--ease),
             border-color .18s var(--ease),
             box-shadow .18s var(--ease);
}

.btn:hover{transform:translateY(-2px);}

.btn--primary{
  background:var(--teal);
  color:var(--paper-light);
  box-shadow:0 18px 32px -24px rgba(15,107,92,.95);
}

.btn--primary:hover{background:var(--deep);}

.btn--ghost{
  background:transparent;
  color:var(--ink);
  border-color:var(--line-strong);
}

.btn--ghost:hover{
  border-color:var(--ink);
  background:rgba(20,16,13,.05);
}

.btn--signal{
  background:var(--orange);
  color:var(--ink);
}

.btn--signal:hover{background:#FF8654;}

.btn--on-dark{
  background:rgba(247,241,230,.1);
  color:var(--paper-light);
  border-color:rgba(247,241,230,.3);
}

.btn--on-dark:hover{
  background:rgba(247,241,230,.22);
  border-color:rgba(45,212,191,.6);
}

/* ---------- 10. 标签与徽标 ---------- */
.tag{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:5px 12px;
  border-radius:var(--r-pill);
  background:rgba(20,16,13,.06);
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.06em;
  color:var(--ink-soft);
}

.tag--teal{
  background:rgba(15,107,92,.12);
  color:var(--teal);
}

.tag--orange{
  background:rgba(255,107,44,.16);
  color:#A8400F;
}

.tag--cyan{
  background:rgba(45,212,191,.2);
  color:#0B6B60;
}

.tag--dark{
  background:var(--ink);
  color:var(--paper-light);
}

/* ---------- 11. 卡片 ---------- */
.card{
  position:relative;
  padding:clamp(18px,2.2vw,28px);
  border:1px solid var(--line);
  border-radius:var(--r-lg);
  background:var(--paper-light);
  transition:transform .2s var(--ease),
             border-color .2s var(--ease),
             box-shadow .2s var(--ease);
}

.card:hover{
  transform:translateY(-3px);
  border-color:rgba(15,107,92,.42);
  box-shadow:var(--shadow-card);
}

.card--ink{
  background:linear-gradient(155deg,var(--ink) 0%,var(--deep) 100%);
  border-color:rgba(247,241,230,.14);
  color:rgba(247,241,230,.82);
}

.card--ink:hover{
  border-color:rgba(45,212,191,.55);
}

.card--ink h3,
.card--ink h2{color:var(--paper-light);}

.card--ink .metric-label{color:rgba(45,212,191,.8);}

/* ---------- 12. 数据表格 ---------- */
.table-wrap{
  overflow-x:auto;
  border-radius:var(--r-md);
  border:1px solid var(--line);
  background:var(--paper-light);
}

.data-table{
  width:100%;
  border-collapse:collapse;
  font-size:14.5px;
  line-height:1.45;
}

.data-table th{
  padding:11px 14px;
  text-align:left;
  font-family:var(--font-mono);
  font-size:11.5px;
  font-weight:600;
  letter-spacing:.1em;
  color:var(--muted);
  border-bottom:1px solid var(--line-strong);
  white-space:nowrap;
}

.data-table td{
  padding:12px 14px;
  border-bottom:1px solid var(--line);
  color:var(--ink-soft);
}

.data-table tbody tr:last-child td{border-bottom:0;}

.data-table tbody tr{
  transition:background-color .16s var(--ease);
}

.data-table tbody tr:hover{
  background:rgba(45,212,191,.14);
}

.data-table .num{
  font-family:var(--font-mono);
  font-weight:700;
  color:var(--ink);
}

/* ---------- 13. 图片容器基础规则 ---------- */
.figure{
  position:relative;
  margin:0;
  overflow:hidden;
  border-radius:var(--r-lg);
  aspect-ratio:16 / 10;
  background:linear-gradient(160deg,var(--ink-soft) 0%,var(--deep) 100%);
  isolation:isolate;
}

.figure img{
  width:100%;
  height:100%;
  object-fit:cover;
}

.figure::after{
  content:"";
  position:absolute;
  inset:0;
  pointer-events:none;
  background-image:
    linear-gradient(to right, rgba(45,212,191,.16) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(45,212,191,.16) 1px, transparent 1px);
  background-size:58px 58px;
  mix-blend-mode:screen;
  opacity:.55;
}

.figure--wide{aspect-ratio:21 / 9;}
.figure--portrait{aspect-ratio:4 / 5;}
.figure--square{aspect-ratio:1 / 1;}

.figure-caption{
  position:absolute;
  left:16px;
  bottom:14px;
  z-index:2;
  padding:5px 12px;
  border-radius:var(--r-pill);
  background:rgba(20,16,13,.62);
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.08em;
  color:rgba(247,241,230,.88);
  -webkit-backdrop-filter:blur(4px);
  backdrop-filter:blur(4px);
}

/* ---------- 14. 面包屑与左侧索引 ---------- */
.breadcrumb{
  font-family:var(--font-mono);
  font-size:12.5px;
  letter-spacing:.04em;
  color:var(--muted);
}

.breadcrumb ol{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:8px;
}

.breadcrumb li{
  display:flex;
  align-items:center;
  gap:8px;
}

.breadcrumb li:not(:last-child)::after{
  content:"/";
  color:rgba(20,16,13,.24);
}

.breadcrumb a{
  color:var(--muted);
  text-decoration:none;
  transition:color .16s var(--ease);
}

.breadcrumb a:hover{color:var(--teal);}

.breadcrumb [aria-current="page"]{
  color:var(--ink);
  font-weight:700;
}

.rail{
  position:sticky;
  top:124px;
  display:grid;
  gap:4px;
  font-size:13.5px;
}

.rail a{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:10px;
  padding:9px 14px;
  border-radius:var(--r-pill);
  color:var(--ink-soft);
  text-decoration:none;
  transition:background-color .16s var(--ease), color .16s var(--ease);
}

.rail a:hover{
  background:rgba(20,16,13,.06);
}

.rail a[aria-current="true"]{
  background:var(--ink);
  color:var(--paper-light);
}

/* ---------- 15. 进入视口显现 ---------- */
@media (prefers-reduced-motion: no-preference){
  [data-reveal]{
    transition:opacity .48s var(--ease), transform .48s var(--ease);
  }

  [data-reveal].is-pending{
    opacity:0;
    transform:translateY(14px);
  }
}

/* ---------- 16. 响应式 ---------- */
@media (max-width:1040px){
  .nav-toggle{display:inline-flex;}

  .nav{
    position:absolute;
    left:0;
    right:0;
    top:calc(100% + 8px);
    display:none;
    flex-direction:column;
    align-items:stretch;
    margin-left:0;
    padding:10px;
    border-radius:var(--r-lg);
    background:linear-gradient(160deg, rgba(20,16,13,.99) 0%, rgba(58,42,32,.99) 100%);
    border:1px solid rgba(247,241,230,.18);
    box-shadow:var(--shadow-float);
  }

  .nav[data-open="true"]{display:flex;}

  .nav-list{
    flex-direction:column;
    align-items:stretch;
    gap:2px;
  }

  .nav-link{
    justify-content:flex-start;
    padding:13px 16px;
    font-size:15.5px;
  }

  .nav-link[aria-current="page"]::after{display:none;}
}

@media (max-width:960px){
  .grid-12{grid-template-columns:repeat(6,minmax(0,1fr));}

  .span-3,
  .span-4{grid-column:span 3;}

  .span-6{grid-column:span 6;}

  .span-8,
  .span-9,
  .span-12{grid-column:span 6;}

  .footer-top{
    grid-template-columns:minmax(0,1fr) minmax(0,1fr);
  }

  .footer-brand{grid-column:1 / -1;}

  .rail{position:static;top:auto;}
}

@media (max-width:900px){
  .split{grid-template-columns:minmax(0,1fr);}
}

@media (max-width:640px){
  .site-header{padding-inline:12px;}

  .header-island{
    gap:10px;
    padding:8px 10px 8px 12px;
  }

  .brand-mark{width:30px;height:30px;}
  .brand-mark::before{inset:7px;}
  .brand-name{font-size:15px;}
  .brand-sub{display:none;}

  .nav-toggle{padding:8px 14px;font-size:13px;}

  .quick-rail{
    width:100%;
    justify-content:center;
    margin-top:8px;
    padding:6px 10px;
  }

  .quick-rail-label{font-size:11px;}

  .quick-rail-link{
    padding:3px 10px;
    font-size:11.5px;
  }

  .grid-12{grid-template-columns:repeat(1,minmax(0,1fr));}

  .span-3,
  .span-4,
  .span-6,
  .span-8,
  .span-9,
  .span-12{grid-column:span 1;}

  .footer-top{grid-template-columns:minmax(0,1fr);}
  .footer-brand{grid-column:auto;}

  .footer-bottom{flex-direction:column;align-items:flex-start;}

  .footer-stamp{font-size:52px;}

  .prose{font-size:16px;}
}

/* ---------- 17. 减少动态偏好 ---------- */
@media (prefers-reduced-motion: reduce){
  *,
  *::before,
  *::after{
    animation-duration:.01ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.01ms !important;
    scroll-behavior:auto !important;
  }

  .btn:hover,
  .card:hover{transform:none;}

  [data-reveal],
  [data-reveal].is-pending{
    opacity:1;
    transform:none;
  }

  .skip-link{transition:none;}
}