/* ============================================================
   FH体育 · FH CN 2026 中文通道
   共享层 site.css —— reset / tokens / 中文排版 / 页头 / 页脚 /
   通用组件 / 响应式 / 无障碍
   ============================================================ */

/* ---------- reset ---------- */
*,*::before,*::after{ box-sizing:border-box; }
html{ -webkit-text-size-adjust:100%; scroll-behavior:smooth; }
body,h1,h2,h3,h4,p,figure,blockquote,dl,dd{ margin:0; }
ul,ol{ margin:0; padding:0; list-style:none; }
img,picture,svg,video{ display:block; max-width:100%; height:auto; }
button{ font:inherit; color:inherit; background:none; border:0; padding:0; cursor:pointer; }
a{ color:inherit; text-decoration:none; }
table{ border-collapse:collapse; width:100%; }
hr{ border:0; }
[hidden]{ display:none !important; }
[id]{ scroll-margin-top:112px; }
:focus-visible{ outline:2px solid #35E6D0; outline-offset:3px; border-radius:6px; }
::selection{ background:rgba(53,230,208,.32); color:#0A1526; }

/* ---------- design tokens ---------- */
:root{
  --navy:#0A1526;
  --steel:#14243A;
  --cream:#F4ECDF;
  --ink:#241A12;
  --cyan:#35E6D0;
  --orange:#FF7A29;
  --silver:#A9B4C2;
  --teal:#0F3A40;
  --bronze:#6E5738;
  --brick:#8C3B1E;

  --line:rgba(169,180,194,.22);
  --line-soft:rgba(169,180,194,.12);
  --glass:rgba(20,36,58,.58);
  --glass-strong:rgba(10,21,38,.92);

  --font-serif:"Songti SC","Source Han Serif SC","Noto Serif SC",STSong,"SimSun",Georgia,serif;
  --font-sans:"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Helvetica Neue",Helvetica,Arial,sans-serif;
  --font-mono:ui-monospace,SFMono-Regular,Menlo,Consolas,"DejaVu Sans Mono",monospace;

  --radius-card:14px;
  --radius-pill:999px;
  --slant:20px;
  --rail:min(1280px, 100% - clamp(24px, 5vw, 72px));
  --gutter:clamp(16px, 2.4vw, 30px);
  --section-space:clamp(44px, 6.5vw, 92px);
}

/* ---------- 中文排版基线 ---------- */
body{
  min-height:100vh;
  font-family:var(--font-sans);
  font-size:clamp(15.5px, .42vw + 14.2px, 17px);
  line-height:1.75;
  letter-spacing:.01em;
  color:var(--silver);
  background:
    radial-gradient(1200px 620px at 78% -6%, rgba(53,230,208,.10), transparent 62%),
    radial-gradient(900px 520px at 4% 10%, rgba(255,122,41,.075), transparent 64%),
    var(--navy);
  background-attachment:fixed;
  word-break:break-word;
  overflow-wrap:anywhere;
}
h1,h2,h3{ font-family:var(--font-serif); color:var(--cream); line-height:1.15; font-weight:800; }
h4,h5{ font-family:var(--font-sans); color:var(--cream); font-weight:700; line-height:1.3; }
p{ text-wrap:pretty; }
.num,[data-num]{ font-family:var(--font-mono); font-variant-numeric:tabular-nums; letter-spacing:.01em; }

/* ---------- 布局容器 ---------- */
.shell{ width:var(--rail); margin-inline:auto; }
.section{ padding-block:var(--section-space); }
.section--tight{ padding-block:clamp(24px,3.4vw,48px); }
.section-head{ max-width:46rem; }
.section-index{
  display:inline-flex; align-items:center; gap:12px;
  font-family:var(--font-mono); font-size:12px; letter-spacing:.2em;
  text-transform:uppercase; color:var(--silver);
}
.section-index::after{ content:""; width:48px; height:1px; background:linear-gradient(90deg,var(--bronze),transparent); }
.section-title{ font-size:clamp(26px, 3.6vw, 44px); margin-top:12px; letter-spacing:.01em; }
.section-lede{ margin-top:14px; max-width:34em; color:rgba(169,180,194,.92); }
.band{
  margin-block:clamp(18px,2.6vw,30px);
  padding:clamp(16px,2.2vw,26px) clamp(20px,3vw,36px);
  background:linear-gradient(100deg, var(--teal), rgba(15,58,64,.28));
  border-left:3px solid var(--cyan);
  clip-path:polygon(0 0, 100% var(--slant), 100% 100%, 0 calc(100% - var(--slant)));
}
.band p{ max-width:38em; color:rgba(244,236,223,.86); }

/* ---------- 网格 ---------- */
.grid{ display:grid; gap:var(--gutter); }
.grid--split{ grid-template-columns:7fr 5fr; }
.grid--split-rev{ grid-template-columns:5fr 7fr; }
.grid--thirds{ grid-template-columns:repeat(3,1fr); }
.grid--halves{ grid-template-columns:repeat(2,1fr); }

/* ---------- 材质层 ---------- */
.glass{
  background:var(--glass);
  border:1px solid var(--line);
  border-radius:var(--radius-card);
  backdrop-filter:blur(12px) saturate(140%);
  -webkit-backdrop-filter:blur(12px) saturate(140%);
  padding:clamp(16px,2.4vw,26px);
}
.paper{
  background:var(--cream);
  color:var(--ink);
  border:1px solid rgba(36,26,18,.16);
  border-radius:var(--radius-card);
  box-shadow:0 24px 60px rgba(0,0,0,.38);
  padding:clamp(20px,3vw,34px);
}
.paper--cut{
  border-radius:0;
  clip-path:polygon(0 0, 100% 0, 100% calc(100% - var(--slant)), calc(100% - var(--slant)) 100%, 0 100%);
  padding-bottom:clamp(34px,4.4vw,52px);
}
.paper .section-title,.paper h2,.paper h3,.paper h4{ color:var(--ink); }
.paper .section-index{ color:rgba(36,26,18,.7); }
.paper .section-lede{ color:rgba(36,26,18,.78); }
.paper a{ color:#0C4A46; text-decoration:underline; text-underline-offset:3px; }

/* ---------- 文本 ---------- */
.prose{ max-width:34em; }
.prose p+p{ margin-top:1em; }
.prose strong{ color:var(--cream); font-weight:700; }
.prose h3{ font-family:var(--font-serif); font-size:clamp(19px,2.2vw,24px); color:var(--cream); margin:1.6em 0 .6em; }
.prose a{ color:var(--cyan); text-decoration:underline; text-underline-offset:3px; }
.paper .prose strong{ color:var(--ink); }
.note{
  padding-left:12px;
  border-left:2px solid var(--bronze);
  font-size:14.5px;
  color:rgba(169,180,194,.9);
}
.paper .note{ color:rgba(36,26,18,.75); border-left-color:var(--bronze); }

/* ---------- 按钮与标签 ---------- */
.btn{
  display:inline-flex; align-items:center; gap:9px;
  padding:12px 22px; border-radius:var(--radius-pill);
  font-size:15px; font-weight:700; letter-spacing:.02em;
  border:1px solid transparent;
  transition:transform .2s ease, background .2s ease, border-color .2s ease, color .2s ease, box-shadow .2s ease;
}
.btn--primary{ background:var(--orange); color:#1C0E04; box-shadow:0 10px 26px rgba(255,122,41,.26); }
.btn--primary:hover{ background:#FF9350; transform:translateY(-2px); }
.btn--ghost{ background:rgba(53,230,208,.08); border-color:rgba(53,230,208,.5); color:var(--cyan); }
.btn--ghost:hover{ background:rgba(53,230,208,.18); transform:translateY(-2px); }
.btn--quiet{ background:rgba(244,236,223,.05); border-color:var(--line); color:var(--cream); }
.btn--quiet:hover{ border-color:rgba(244,236,223,.42); }
.chip{
  display:inline-flex; align-items:center; gap:7px;
  padding:5px 12px; border-radius:var(--radius-pill);
  font-family:var(--font-mono); font-size:12px; letter-spacing:.06em;
  color:var(--silver); background:rgba(20,36,58,.6); border:1px solid var(--line);
}
.chip--cyan{ color:var(--cyan); border-color:rgba(53,230,208,.45); background:rgba(53,230,208,.1); }
.chip--orange{ color:var(--orange); border-color:rgba(255,122,41,.45); background:rgba(255,122,41,.1); }

/* ---------- 数据表 ---------- */
.table-scroll{
  overflow-x:auto;
  border:1px solid var(--line);
  border-radius:var(--radius-card);
  background:rgba(10,21,38,.5);
  -webkit-overflow-scrolling:touch;
}
.data-table{ min-width:520px; font-variant-numeric:tabular-nums; }
.data-table th,.data-table td{
  padding:11px 14px;
  text-align:left;
  font-size:14.5px;
  border-bottom:1px solid var(--line-soft);
  white-space:nowrap;
}
.data-table thead th{
  font-family:var(--font-mono);
  font-size:12px; letter-spacing:.14em; text-transform:uppercase;
  color:var(--silver);
  background:rgba(20,36,58,.86);
}
.data-table tbody tr:hover{ background:rgba(53,230,208,.07); }
.data-table th[data-align="num"],.data-table td[data-align="num"]{ text-align:right; font-family:var(--font-mono); }
.data-table tr[data-highlight]{ background:rgba(255,122,41,.11); }
.paper .data-table{ color:var(--ink); }
.paper .data-table thead th{ background:#E9DFCE; color:var(--ink); border-bottom-color:rgba(36,26,18,.2); }
.paper .data-table th,.paper .data-table td{ border-bottom-color:rgba(36,26,18,.14); }
.paper .data-table tbody tr:hover{ background:rgba(53,230,208,.2); }

/* ---------- 数字块 ---------- */
.stat{
  display:flex; flex-direction:column; gap:4px;
  padding:14px 16px;
  border:1px solid var(--line);
  border-left:3px solid var(--cyan);
  border-radius:12px;
  background:rgba(20,36,58,.55);
}
.stat__value{ font-family:var(--font-mono); font-size:clamp(22px,3vw,30px); font-weight:700; line-height:1.1; color:var(--cyan); }
.stat__label{ font-size:13px; color:var(--silver); }
.paper .stat{ background:#EBE1D1; border-color:rgba(36,26,18,.16); border-left-color:var(--teal); }
.paper .stat__value{ color:#0F3A40; }
.paper .stat__label{ color:rgba(36,26,18,.72); }

/* ---------- 面包屑 ---------- */
.breadcrumbs{
  display:flex; flex-wrap:wrap; align-items:center; gap:8px;
  font-family:var(--font-mono); font-size:12px; letter-spacing:.08em;
  color:rgba(169,180,194,.8);
}
.breadcrumbs__item{ display:inline-flex; align-items:center; gap:8px; }
.breadcrumbs__item+.breadcrumbs__item::before{ content:"/"; color:var(--bronze); }
.breadcrumbs a:hover{ color:var(--cyan); }

/* ---------- 章节目录 ---------- */
.toc{
  position:sticky; top:100px; align-self:start;
  padding:16px;
  border:1px solid var(--line);
  border-radius:var(--radius-card);
  background:var(--glass);
  backdrop-filter:blur(10px);
  -webkit-backdrop-filter:blur(10px);
}
.toc__head{
  padding-bottom:10px;
  border-bottom:1px solid var(--line);
  font-family:var(--font-mono); font-size:11.5px; letter-spacing:.2em;
  text-transform:uppercase; color:var(--bronze);
}
.toc__link{
  display:block; padding:8px 10px; border-radius:8px;
  border-left:2px solid transparent;
  font-size:14px; color:rgba(244,236,223,.74);
  transition:background .2s ease, color .2s ease, border-color .2s ease;
}
.toc__link:hover{ color:var(--cream); background:rgba(53,230,208,.08); }
.toc__link[aria-current="true"]{ color:var(--cyan); border-left-color:var(--cyan); background:rgba(53,230,208,.11); }
.toc__more{
  margin-top:12px; padding-top:12px;
  border-top:1px dashed var(--line);
  display:grid; gap:6px;
}
.toc__more a{ font-size:13.5px; color:var(--silver); }
.toc__more a:hover{ color:var(--cyan); }

/* ---------- 标签页 ---------- */
.tabs{
  display:flex; flex-wrap:wrap; gap:4px;
  width:max-content; max-width:100%;
  padding:5px; border-radius:var(--radius-pill);
  background:rgba(10,21,38,.62);
  border:1px solid var(--line);
}
.tab{
  padding:8px 14px; border-radius:var(--radius-pill);
  font-family:var(--font-mono); font-size:13px; font-weight:600;
  color:rgba(244,236,223,.72);
  transition:background .2s ease, color .2s ease, box-shadow .2s ease;
}
.tab:hover{ color:var(--cream); }
.tab[aria-selected="true"]{ color:var(--cyan); background:rgba(53,230,208,.16); box-shadow:inset 0 0 0 1px rgba(53,230,208,.5); }
.tabpanel{ padding-top:var(--gutter); }
.tabpanel[hidden]{ display:none !important; }

/* ---------- 折叠问答 ---------- */
.accordion{ border-top:1px solid var(--line); }
.accordion__item{ border-bottom:1px solid var(--line); }
.accordion__trigger{
  display:flex; align-items:flex-start; gap:12px;
  width:100%; padding:16px 4px;
  text-align:left;
  font-size:16.5px; font-weight:600; color:var(--cream);
  transition:color .2s ease;
}
.accordion__trigger::before{
  content:"+"; flex:0 0 auto;
  font-family:var(--font-mono); font-size:16px; line-height:1.4;
  color:var(--cyan);
}
.accordion__item[data-open] .accordion__trigger::before{ content:"–"; color:var(--orange); }
.accordion__trigger:hover{ color:var(--cyan); }
.accordion__panel{ display:none; padding:0 4px 18px 28px; color:rgba(169,180,194,.92); }
.accordion__item[data-open] .accordion__panel{ display:block; }
.paper .accordion,.paper .accordion__item{ border-color:rgba(36,26,18,.16); }
.paper .accordion__trigger{ color:var(--ink); }
.paper .accordion__panel{ color:rgba(36,26,18,.78); }

/* ---------- 媒体容器 ---------- */
.media-frame{
  position:relative; overflow:hidden;
  aspect-ratio:16/10;
  border:1px solid var(--line);
  border-radius:var(--radius-card);
  background:linear-gradient(150deg, var(--steel), var(--teal));
}
.media-frame img,.media-frame svg{ width:100%; height:100%; object-fit:cover; }
.media-frame::after{
  content:""; position:absolute; inset:0; pointer-events:none;
  background:linear-gradient(180deg, rgba(10,21,38,.12) 0%, rgba(10,21,38,.72) 100%);
}
.media-frame--wide{ aspect-ratio:21/9; }
.media-frame--tall{ aspect-ratio:3/4; }
.media-frame--tilt{ transform:rotate(-1.4deg); }
.media-frame--empty{
  display:grid; place-items:center;
  background:repeating-linear-gradient(135deg, rgba(20,36,58,.9) 0 14px, rgba(15,58,64,.65) 14px 28px);
}
.media-frame__caption{
  position:absolute; left:14px; right:14px; bottom:12px; z-index:2;
  font-family:var(--font-mono); font-size:12.5px; letter-spacing:.04em;
  color:var(--cream);
}
.media-frame--empty .media-frame__caption{ position:static; padding:14px; text-align:center; color:var(--silver); }

/* ---------- 返回顶部 ---------- */
.to-top{
  position:fixed; right:clamp(14px,3vw,28px); bottom:clamp(14px,3vw,28px); z-index:70;
  display:inline-flex; align-items:center; gap:8px;
  padding:11px 16px; border-radius:var(--radius-pill);
  background:rgba(10,21,38,.9);
  border:1px solid rgba(53,230,208,.42);
  color:var(--cyan); font-size:13.5px; font-weight:600;
  backdrop-filter:blur(10px);
  -webkit-backdrop-filter:blur(10px);
  opacity:0; visibility:hidden; transform:translateY(10px);
  transition:opacity .3s ease, transform .3s ease, background .2s ease, visibility .3s;
}
.to-top[data-visible]{ opacity:1; visibility:visible; transform:none; }
.to-top:hover{ background:rgba(53,230,208,.18); }
.to-top__icon{ font-family:var(--font-mono); font-size:15px; line-height:1; }
.to-top__text{ letter-spacing:.04em; }

/* ---------- 滚动显现 ---------- */
[data-reveal]{ opacity:0; transform:translateY(18px); transition:opacity .6s ease, transform .6s ease; }
[data-reveal].is-visible{ opacity:1; transform:none; }

/* ============================================================
   页头
   ============================================================ */
.site-header{
  position:sticky; top:0; z-index:90;
  padding:10px clamp(10px,2.2vw,28px) 0;
  background:linear-gradient(180deg, rgba(10,21,38,.95) 0%, rgba(10,21,38,.7) 58%, rgba(10,21,38,0) 100%);
  transition:padding .28s ease;
}
.site-header[data-scrolled]{ padding-top:6px; }
.skip-link{
  position:absolute; left:50%; top:8px;
  transform:translate(-50%,-180%);
  z-index:120;
  padding:10px 20px; border-radius:var(--radius-pill);
  background:var(--cream); color:var(--ink);
  font-size:14px; font-weight:700;
  transition:transform .2s ease;
}
.skip-link:focus{ transform:translate(-50%,0); }
.scroll-progress{
  position:absolute; top:0; left:0; right:0; height:2px;
  background:rgba(169,180,194,.14);
}
.scroll-progress__bar{
  display:block; height:100%; width:0%;
  background:linear-gradient(90deg, var(--cyan), var(--orange));
  transition:width .12s linear;
}
.header-rail{
  display:flex; align-items:center; gap:clamp(10px,1.6vw,20px);
  width:var(--rail); margin-inline:auto;
  padding:10px clamp(12px,1.6vw,20px);
  border:1px solid var(--line);
  border-radius:var(--radius-pill);
  background:rgba(20,36,58,.62);
  backdrop-filter:blur(14px) saturate(150%);
  -webkit-backdrop-filter:blur(14px) saturate(150%);
  box-shadow:0 10px 30px rgba(0,0,0,.28);
  transition:background .28s ease, border-color .28s ease, box-shadow .28s ease, padding .28s ease;
}
.site-header[data-scrolled] .header-rail{
  padding-block:6px;
  background:rgba(10,21,38,.88);
  border-color:rgba(53,230,208,.22);
  box-shadow:0 14px 40px rgba(0,0,0,.5);
}

/* 品牌浮岛 */
.brand-island{
  flex:0 0 auto;
  display:inline-flex; align-items:center; gap:10px;
  padding:6px 16px 6px 8px;
  border:1px solid var(--line);
  border-radius:var(--radius-pill);
  background:rgba(244,236,223,.06);
  transition:background .25s ease, border-color .25s ease;
}
.brand-island:hover{ background:rgba(53,230,208,.1); border-color:rgba(53,230,208,.45); }
.brand-mark{
  flex:0 0 34px; width:34px; height:34px;
  display:grid; place-items:center;
  font-family:var(--font-mono); font-size:14px; font-weight:700; letter-spacing:.04em;
  color:var(--navy);
  background:linear-gradient(140deg, var(--cyan), var(--teal) 72%);
  clip-path:polygon(0 0, 100% 0, 100% 72%, 72% 100%, 0 100%);
}
.brand-text{ display:flex; flex-direction:column; line-height:1.15; }
.brand-name{ font-size:16px; font-weight:700; letter-spacing:.06em; color:var(--cream); }
.brand-sub{
  overflow:hidden;
  max-height:18px;
  font-family:var(--font-mono); font-size:11.5px; letter-spacing:.08em;
  color:var(--cyan); white-space:nowrap;
  transition:opacity .25s ease, max-height .25s ease;
}
.site-header[data-scrolled] .brand-sub{ opacity:0; max-height:0; }

/* 栏目胶囊 */
.nav-pill{
  flex:0 1 auto; margin-inline:auto;
  padding:5px;
  border:1px solid var(--line);
  border-radius:var(--radius-pill);
  background:rgba(10,21,38,.55);
  backdrop-filter:blur(10px);
  -webkit-backdrop-filter:blur(10px);
}
.nav-list{ display:flex; align-items:center; gap:2px; }
.nav-link{
  display:inline-flex; align-items:center; gap:6px;
  padding:8px 14px;
  border:1px solid transparent;
  border-radius:var(--radius-pill);
  font-size:14.5px; font-weight:600; letter-spacing:.02em;
  color:rgba(244,236,223,.78);
  white-space:nowrap;
  transition:color .2s ease, background .2s ease, border-color .2s ease;
}
.nav-link::before{
  content:""; width:5px; height:5px; border-radius:50%;
  background:var(--bronze);
  transition:background .2s ease, box-shadow .2s ease;
}
.nav-link:hover{ color:var(--cream); background:rgba(53,230,208,.1); }
.nav-link:hover::before{ background:var(--cyan); }
.nav-link[aria-current="page"]{
  color:var(--cyan);
  background:rgba(53,230,208,.14);
  border-color:rgba(53,230,208,.5);
}
.nav-link[aria-current="page"]::before{ background:var(--orange); box-shadow:0 0 0 3px rgba(255,122,41,.22); }

/* 状态胶囊 */
.status-capsule{
  flex:0 0 auto;
  display:inline-flex; align-items:center; gap:9px;
  padding:7px 14px 7px 11px;
  border:1px solid rgba(255,122,41,.42);
  border-radius:var(--radius-pill);
  background:rgba(255,122,41,.1);
  color:var(--cream); font-size:13px;
  transition:background .22s ease, border-color .22s ease, transform .22s ease;
}
.status-capsule:hover{ background:rgba(255,122,41,.2); border-color:rgba(255,122,41,.7); transform:translateY(-1px); }
.status-dot{
  width:8px; height:8px; border-radius:50%; background:var(--orange);
  box-shadow:0 0 0 4px rgba(255,122,41,.18);
  animation:pulse 2.4s ease-in-out infinite;
}
.status-label{ font-family:var(--font-mono); font-weight:600; letter-spacing:.02em; }
.status-meta{ padding-left:9px; border-left:1px solid rgba(169,180,194,.3); font-size:12.5px; color:var(--silver); }
@keyframes pulse{
  0%,100%{ transform:scale(1); opacity:1; }
  50%{ transform:scale(.82); opacity:.72; }
}

/* 汉堡胶囊 */
.nav-toggle{
  display:none;
  flex:0 0 auto;
  align-items:center; gap:9px;
  padding:7px 14px 7px 12px;
  border:1px solid var(--line);
  border-radius:var(--radius-pill);
  background:rgba(20,36,58,.82);
  color:var(--cream); font-size:13.5px; font-weight:600;
}
.nav-toggle-bars{ position:relative; display:inline-block; width:18px; height:12px; }
.nav-toggle-bars::before,
.nav-toggle-bars::after{
  content:""; position:absolute; left:0; right:0; height:2px; border-radius:2px;
  background:var(--cyan);
  transition:transform .25s ease, top .25s ease, bottom .25s ease;
}
.nav-toggle-bars::before{ top:0; }
.nav-toggle-bars::after{ bottom:0; }
.site-header[data-open] .nav-toggle-bars::before{ top:5px; transform:rotate(45deg); }
.site-header[data-open] .nav-toggle-bars::after{ bottom:5px; transform:rotate(-45deg); }

/* 移动导航面板 */
.mobile-nav{
  display:none;
  width:var(--rail); margin:10px auto 0;
  padding:14px;
  border:1px solid var(--line);
  border-radius:22px;
  background:var(--glass-strong);
  backdrop-filter:blur(16px);
  -webkit-backdrop-filter:blur(16px);
  box-shadow:0 24px 60px rgba(0,0,0,.55);
}
.site-header[data-open] .mobile-nav{ display:block; animation:nav-drop .24s ease both; }
@keyframes nav-drop{ from{ opacity:0; transform:translateY(-8px); } to{ opacity:1; transform:none; } }
.mobile-group{
  padding:10px 12px;
  border:1px solid var(--line-soft);
  border-radius:14px;
  background:rgba(20,36,58,.6);
}
.mobile-group+.mobile-group{ margin-top:10px; }
.mobile-group__head{
  display:flex; align-items:center; justify-content:space-between;
  padding:2px 0 8px;
  font-family:var(--font-mono); font-size:11.5px; letter-spacing:.18em;
  text-transform:uppercase; color:var(--silver);
}
.mobile-group__num{ color:var(--cyan); }
.mobile-link{
  display:flex; align-items:center; justify-content:space-between; gap:10px;
  padding:11px 12px;
  border:1px solid transparent;
  border-radius:10px;
  font-size:15.5px; font-weight:600; color:var(--cream);
  transition:background .2s ease, border-color .2s ease, color .2s ease;
}
.mobile-link+.mobile-link{ margin-top:4px; }
.mobile-link::after{ content:"›"; font-size:18px; line-height:1; color:var(--silver); }
.mobile-link:hover{ background:rgba(53,230,208,.1); border-color:rgba(53,230,208,.35); }
.mobile-link[aria-current="page"]{ color:var(--cyan); background:rgba(53,230,208,.12); border-color:rgba(53,230,208,.42); }
.mobile-status{
  display:flex; align-items:center; gap:9px;
  margin-top:10px; padding:11px 14px;
  border:1px solid rgba(255,122,41,.4);
  border-radius:14px;
  background:rgba(255,122,41,.1);
  font-size:13.5px; color:var(--cream);
}
.mobile-nav__foot{
  display:flex; gap:8px;
  margin-top:12px; padding-top:12px;
  border-top:1px dashed var(--line);
}
.mobile-nav__btn{
  flex:1 1 0; min-width:0;
  padding:11px 14px;
  border:1px solid var(--line);
  border-radius:var(--radius-pill);
  background:rgba(244,236,223,.06);
  color:var(--cream); font-size:14px; font-weight:600; text-align:center;
  transition:background .2s ease, border-color .2s ease;
}
.mobile-nav__btn:hover{ background:rgba(244,236,223,.14); }
.mobile-nav__btn--back{ background:rgba(255,122,41,.14); border-color:rgba(255,122,41,.45); }

/* ============================================================
   页脚
   ============================================================ */
.site-footer{
  margin-top:var(--section-space);
  padding:clamp(40px,6vw,76px) 0 clamp(20px,3vw,32px);
  border-top:1px solid rgba(53,230,208,.18);
  background:linear-gradient(180deg, rgba(15,58,64,.6) 0%, rgba(10,21,38,.98) 44%);
  color:var(--silver);
}
.footer-inner{ width:var(--rail); margin-inline:auto; }
.footer-top{
  display:grid;
  grid-template-columns:1.6fr 1fr 1fr 1fr;
  gap:clamp(22px,3vw,44px);
  padding-bottom:clamp(26px,3.4vw,40px);
  border-bottom:1px solid var(--line);
}
.footer-brand{ display:flex; flex-direction:column; gap:10px; align-items:flex-start; }
.footer-mark{
  width:42px; height:42px;
  display:grid; place-items:center;
  font-family:var(--font-mono); font-size:16px; font-weight:700;
  color:var(--navy);
  background:linear-gradient(140deg, var(--cyan), var(--teal) 72%);
  clip-path:polygon(0 0, 100% 0, 100% 72%, 72% 100%, 0 100%);
}
.footer-brandname{ font-size:17px; font-weight:700; letter-spacing:.08em; color:var(--cream); }
.footer-tagline{ max-width:22em; font-size:14px; color:rgba(169,180,194,.9); }
.footer-chip{
  display:inline-flex; align-items:center; gap:8px;
  padding:5px 12px;
  border:1px solid rgba(53,230,208,.35);
  border-radius:var(--radius-pill);
  font-family:var(--font-mono); font-size:12px; letter-spacing:.04em;
  color:var(--cyan);
  background:rgba(53,230,208,.08);
}
.footer-chip__dot{ width:6px; height:6px; border-radius:50%; background:var(--orange); }
.footer-col{ min-width:0; }
.footer-head{
  display:flex; align-items:center; gap:9px;
  padding-bottom:12px;
  border-bottom:1px solid var(--line);
  font-family:var(--font-sans);
  font-size:12.5px; font-weight:700; letter-spacing:.16em;
  text-transform:uppercase;
  color:var(--cream);
}
.footer-head__num{ font-family:var(--font-mono); font-size:11.5px; letter-spacing:.1em; color:var(--bronze); }
.footer-links{ margin-top:10px; display:grid; gap:2px; }
.footer-link{
  display:inline-block;
  padding:5px 0;
  font-size:14.5px;
  color:rgba(169,180,194,.92);
  border-bottom:1px solid transparent;
  transition:color .2s ease, border-color .2s ease, transform .2s ease;
}
.footer-link:hover{ color:var(--cyan); border-bottom-color:rgba(53,230,208,.5); transform:translateX(3px); }
.footer-link--home{ color:var(--cream); font-weight:600; }
.footer-rule{
  height:3px;
  background:linear-gradient(90deg, var(--brick), rgba(140,59,30,.15) 42%, transparent);
}
.footer-legal{
  display:flex; flex-wrap:wrap; gap:10px 32px;
  padding:clamp(16px,2.2vw,24px) 0;
  border-bottom:1px dashed var(--line);
}
.footer-legal__item{ display:inline-flex; align-items:baseline; gap:9px; font-size:13.5px; }
.footer-legal__label{
  font-family:var(--font-mono); font-size:11px; letter-spacing:.14em;
  color:var(--bronze); text-transform:uppercase;
}
.footer-legal__value{ color:rgba(169,180,194,.92); }
.footer-legal__value--mono{ font-family:var(--font-mono); color:var(--cream); letter-spacing:.02em; }
.footer-actions{
  display:flex; flex-wrap:wrap; align-items:center; justify-content:space-between;
  gap:14px;
  padding-top:clamp(16px,2.2vw,24px);
}
.footer-stamp{ font-family:var(--font-mono); font-size:12.5px; letter-spacing:.04em; color:rgba(169,180,194,.75); }
.footer-buttons{ display:flex; align-items:center; gap:16px; }
.footer-top-btn{
  padding:9px 18px;
  border:1px solid rgba(53,230,208,.42);
  border-radius:var(--radius-pill);
  background:rgba(53,230,208,.08);
  color:var(--cyan); font-size:13.5px; font-weight:600;
  transition:background .2s ease, transform .2s ease;
}
.footer-top-btn:hover{ background:rgba(53,230,208,.2); transform:translateY(-2px); }

/* ============================================================
   响应式
   ============================================================ */
@media (max-width:1180px){
  .nav-link{ padding:8px 11px; font-size:14px; }
}
@media (max-width:1024px){
  .status-meta{ display:none; }
}
@media (max-width:980px){
  .nav-pill{ display:none; }
  .nav-toggle{ display:inline-flex; }
  .status-capsule{ margin-left:auto; }
  .grid--split,.grid--split-rev{ grid-template-columns:1fr; }
  .grid--thirds{ grid-template-columns:repeat(2,1fr); }
  .footer-top{ grid-template-columns:1.4fr 1fr 1fr; }
  .footer-brand{ grid-column:1 / -1; }
  .toc{ position:static; }
}
@media (min-width:981px){
  .mobile-nav{ display:none !important; }
  .nav-toggle{ display:none !important; }
}
@media (max-width:720px){
  .grid--halves{ grid-template-columns:1fr; }
  .grid--thirds{ grid-template-columns:1fr; }
  .footer-top{ grid-template-columns:1fr; }
  .footer-actions{ flex-direction:column; align-items:flex-start; }
  .band{ clip-path:polygon(0 0, 100% 14px, 100% 100%, 0 calc(100% - 14px)); }
  .media-frame--tilt{ transform:none; }
}
@media (max-width:560px){
  .status-capsule{ display:none; }
  .brand-sub{ display:none; }
  .header-rail{ padding-inline:10px; }
  .to-top__text{ display:none; }
  .to-top{ padding:12px; }
  .footer-legal{ flex-direction:column; gap:8px; }
}

/* ============================================================
   无障碍与动效降级
   ============================================================ */
@media (prefers-reduced-motion: reduce){
  html{ scroll-behavior:auto; }
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
  }
  [data-reveal]{ opacity:1; transform:none; }
  .status-dot{ animation:none; }
  .to-top{ transition:none; }
}
@media (prefers-contrast: more){
  :root{ --line:rgba(244,236,223,.5); }
  body{ color:#E4EAF1; }
}