/* =============================================================
   99真人会馆 · /assets/site.css
   共享外壳：档案索引 × 会馆门廊
   1 变量  2 重置  3 可访问性  4 排版与工具类  5 布局
   6 头部  7 导航  8 按钮  9 面包屑  10 章节  11 索引
   12 筛选  13 卡片与标签  14 图片位  15 显现  16 页脚
   17 响应式  18 动效降级
   ============================================================= */

/* ---------- 1. 变量 ---------- */
:root{
  --ink:#0A1D18;
  --pine:#12302A;
  --moss:#1F4B3E;
  --paper:#F3EEDF;
  --paper-2:#E5DDC8;
  --gold:#C9A227;
  --gold-bright:#E8C766;
  --cinnabar:#B23A2E;
  --stone:#6E7C74;
  --clay:#A9765A;
  --text:#2B3A34;

  --font-display:"Noto Serif SC","Source Han Serif SC","Songti SC","SimSun",serif;
  --font-body:"Noto Sans SC","PingFang SC","Microsoft YaHei",system-ui,sans-serif;
  --font-mono:"JetBrains Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;

  --w-max:1280px;
  --pad-x:64px;
  --gap:24px;
  --radius:2px;
  --radius-lg:12px;

  --line-soft:1px solid rgba(110,124,116,.30);
  --line-gold:1px solid rgba(201,162,39,.45);
  --glass:rgba(18,48,42,.74);
  --shadow-float:0 14px 34px -22px rgba(10,29,24,.85);
  --ease:cubic-bezier(.22,.61,.36,1);
}

/* ---------- 2. 重置 ---------- */
*,*::before,*::after{box-sizing:border-box}
html{
  -webkit-text-size-adjust:100%;
  scroll-behavior:smooth;
  scroll-padding-top:120px;
}
body{
  margin:0;
  min-height:100%;
  background-color:var(--paper);
  background-image:
    radial-gradient(circle at 6% -12%, rgba(31,75,62,.16), transparent 46%),
    radial-gradient(circle at 96% 2%, rgba(169,118,90,.14), transparent 42%),
    repeating-linear-gradient(180deg, rgba(43,58,52,.035) 0 1px, transparent 1px 6px);
  color:var(--text);
  font-family:var(--font-body);
  font-size:16px;
  font-weight:400;
  line-height:1.75;
  text-rendering:optimizeLegibility;
  -webkit-font-smoothing:antialiased;
}
h1,h2,h3,h4,p,figure,blockquote,ul,ol,dl,dd{margin:0}
ul,ol{padding:0;list-style:none}
img,svg,video{display:block;max-width:100%}
img{height:auto}
a{color:inherit;text-decoration:none}
button,input,select,textarea{font:inherit;color:inherit}
button{background:none;border:0}
hr{border:0}

/* ---------- 3. 可访问性 ---------- */
.skip-link{
  position:absolute;
  left:16px;
  top:-80px;
  z-index:300;
  padding:10px 20px;
  border-radius:var(--radius);
  background:var(--gold-bright);
  color:var(--ink);
  font-size:14px;
  font-weight:500;
  letter-spacing:.02em;
  transition:top .22s var(--ease);
}
.skip-link:focus{top:16px}
:focus-visible{
  outline:2px solid var(--gold);
  outline-offset:3px;
  border-radius:2px;
}

/* ---------- 4. 排版与工具类 ---------- */
h1,h2,h3,h4{
  font-family:var(--font-display);
  font-weight:700;
  letter-spacing:.02em;
  line-height:1.3;
  color:var(--pine);
}
h1{font-size:clamp(32px,4.4vw,52px);font-weight:900;line-height:1.2}
h2{font-size:clamp(24px,3vw,32px)}
h3{font-size:20px}
h4{font-size:17px}

.mono{
  font-family:var(--font-mono);
  font-size:.86em;
  letter-spacing:.06em;
  font-variant-numeric:tabular-nums;
}
.mono--u{
  border-bottom:1px solid rgba(201,162,39,.75);
  padding-bottom:1px;
}

.prose{font-size:16px;line-height:1.78;color:var(--text)}
.prose p{max-width:38em;margin-bottom:1.05em}
.prose p:last-child{margin-bottom:0}
.prose ul,.prose ol{padding-left:1.5em;margin-bottom:1.05em}
.prose ul{list-style:disc}
.prose ol{list-style:decimal}
.prose li{margin-bottom:.35em}
.prose a{
  color:var(--moss);
  border-bottom:1px solid rgba(201,162,39,.7);
  transition:color .2s var(--ease),border-color .2s var(--ease);
}
.prose a:hover{color:#8a6c12;border-bottom-color:var(--gold)}
.prose strong{color:var(--pine);font-weight:500}
.prose h3{margin:1.6em 0 .6em}
.note{
  font-size:14px;
  line-height:1.7;
  color:var(--stone);
}

/* ---------- 5. 布局 ---------- */
.shell{
  width:100%;
  max-width:var(--w-max);
  margin-inline:auto;
  padding-inline:var(--pad-x);
}
.grid-split{
  display:grid;
  grid-template-columns:5fr 7fr;
  gap:clamp(24px,4vw,56px);
  align-items:start;
}
.rule{
  height:1px;
  background:rgba(110,124,116,.30);
  margin:72px 0;
}

/* ---------- 6. 头部 ---------- */
.site-header{
  position:sticky;
  top:0;
  z-index:60;
  padding:18px var(--pad-x) 16px;
  background:linear-gradient(180deg,
    rgba(243,238,223,.98) 0%,
    rgba(243,238,223,.92) 52%,
    rgba(243,238,223,0) 100%);
  backdrop-filter:blur(2px);
  transition:padding .24s var(--ease);
}
.site-header__inner{
  max-width:var(--w-max);
  margin-inline:auto;
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:16px;
}
.site-header.is-condensed{padding-top:10px;padding-bottom:10px}

.brand{
  display:inline-flex;
  align-items:center;
  gap:12px;
  padding:7px 18px 7px 7px;
  border:var(--line-gold);
  border-radius:999px;
  background:var(--glass);
  backdrop-filter:blur(12px) saturate(120%);
  box-shadow:var(--shadow-float);
  color:var(--paper);
  transition:border-color .2s var(--ease),box-shadow .2s var(--ease);
}
.brand:hover{border-color:rgba(232,199,102,.95)}
.brand__seal{
  display:grid;
  place-items:center;
  width:36px;
  height:36px;
  flex:0 0 auto;
  border:1px solid rgba(232,199,102,.85);
  border-radius:var(--radius);
  background:linear-gradient(158deg,rgba(232,199,102,.20),rgba(232,199,102,0) 72%);
  color:var(--gold-bright);
  font-family:var(--font-mono);
  font-size:13px;
  letter-spacing:.03em;
  line-height:1;
}
.brand__text{display:flex;flex-direction:column;line-height:1.2}
.brand__name{
  font-family:var(--font-display);
  font-size:16px;
  font-weight:700;
  letter-spacing:.06em;
  color:var(--paper);
}
.brand__sub{
  max-height:18px;
  overflow:hidden;
  color:rgba(232,199,102,.78);
  font-size:10.5px;
  letter-spacing:.14em;
  white-space:nowrap;
  transition:max-height .22s var(--ease),opacity .22s var(--ease),transform .22s var(--ease);
}
.site-header.is-condensed .brand__sub{
  max-height:0;
  opacity:0;
  transform:translateY(-3px);
}

/* ---------- 7. 导航 ---------- */
.site-nav{
  display:flex;
  align-items:center;
  gap:6px;
  padding:6px;
  border:var(--line-gold);
  border-radius:999px;
  background:var(--glass);
  backdrop-filter:blur(12px) saturate(120%);
  box-shadow:var(--shadow-float);
}
.site-nav__list{
  display:flex;
  align-items:center;
  gap:2px;
}
.site-nav__link{
  display:block;
  padding:8px 14px;
  border:1px solid transparent;
  border-radius:999px;
  color:rgba(243,238,223,.82);
  font-size:14.5px;
  line-height:1.4;
  white-space:nowrap;
  transition:color .2s var(--ease),background .2s var(--ease),border-color .2s var(--ease);
}
.site-nav__link:hover{
  color:var(--gold-bright);
  border-color:rgba(232,199,102,.40);
  background:rgba(232,199,102,.08);
}
.site-nav__link[aria-current="page"]{
  color:var(--ink);
  font-weight:500;
  border-color:rgba(232,199,102,.95);
  background:linear-gradient(180deg,var(--gold-bright),var(--gold));
}
.site-nav__cta{margin-left:6px}
.site-header.is-condensed .site-nav__link{padding-top:6px;padding-bottom:6px}

.nav-toggle{
  display:none;
  align-items:center;
  gap:9px;
  padding:10px 16px;
  border:var(--line-gold);
  border-radius:999px;
  background:var(--glass);
  backdrop-filter:blur(12px) saturate(120%);
  box-shadow:var(--shadow-float);
  color:var(--paper);
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.12em;
  cursor:pointer;
  transition:border-color .2s var(--ease),color .2s var(--ease);
}
.nav-toggle:hover{border-color:rgba(232,199,102,.95);color:var(--gold-bright)}
.nav-toggle__bars{display:grid;gap:4px;width:18px}
.nav-toggle__bars span{
  display:block;
  height:1.5px;
  border-radius:2px;
  background:currentColor;
  transition:transform .22s var(--ease),opacity .22s var(--ease);
}
.site-header[data-open="true"] .nav-toggle{
  color:var(--gold-bright);
  border-color:rgba(232,199,102,.95);
}
.site-header[data-open="true"] .nav-toggle__bars span:nth-child(1){transform:translateY(5.5px) rotate(45deg)}
.site-header[data-open="true"] .nav-toggle__bars span:nth-child(2){opacity:0}
.site-header[data-open="true"] .nav-toggle__bars span:nth-child(3){transform:translateY(-5.5px) rotate(-45deg)}

/* ---------- 8. 按钮 ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  padding:10px 20px;
  border:1px solid transparent;
  border-radius:999px;
  font-family:var(--font-body);
  font-size:14.5px;
  font-weight:500;
  line-height:1.3;
  letter-spacing:.02em;
  cursor:pointer;
  transition:background .2s var(--ease),color .2s var(--ease),
             border-color .2s var(--ease),box-shadow .2s var(--ease);
}
.btn--gold{
  color:#14201a;
  border-color:rgba(232,199,102,.95);
  background:linear-gradient(180deg,var(--gold-bright),var(--gold));
  box-shadow:0 6px 18px -14px rgba(10,29,24,.9);
}
.btn--gold:hover{box-shadow:0 0 0 1px rgba(232,199,102,.85),0 10px 22px -16px rgba(10,29,24,.9)}
.btn--ghost{
  color:var(--gold-bright);
  border-color:rgba(232,199,102,.58);
  background:rgba(232,199,102,.08);
}
.btn--ghost:hover{
  border-color:var(--gold-bright);
  background:rgba(232,199,102,.18);
  box-shadow:0 0 0 1px rgba(232,199,102,.45);
}
.btn--sm{padding:7px 15px;font-size:13px}

/* ---------- 9. 面包屑 ---------- */
.crumbs{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:7px;
  margin-bottom:24px;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.08em;
  color:var(--stone);
}
.crumbs a{
  border-bottom:1px solid transparent;
  transition:color .2s var(--ease),border-color .2s var(--ease);
}
.crumbs a:hover{color:#8a6c12;border-bottom-color:rgba(201,162,39,.7)}
.crumbs__sep{opacity:.45}
.crumbs [aria-current="page"]{color:var(--pine)}

/* ---------- 10. 章节头 ---------- */
.sec-head{
  display:flex;
  align-items:baseline;
  gap:16px;
  padding-bottom:16px;
  margin-bottom:32px;
  border-bottom:var(--line-soft);
}
.sec-num{
  flex:0 0 auto;
  font-family:var(--font-mono);
  font-size:clamp(28px,3.4vw,40px);
  line-height:1;
  letter-spacing:.02em;
  color:rgba(201,162,39,.24);
  -webkit-text-stroke:1px var(--gold);
  font-variant-numeric:tabular-nums;
}
.sec-title{
  font-family:var(--font-display);
  font-size:clamp(20px,2.4vw,26px);
  font-weight:700;
  letter-spacing:.02em;
  color:var(--pine);
}
.sec-kicker{
  margin-left:auto;
  font-family:var(--font-mono);
  font-size:11.5px;
  letter-spacing:.16em;
  color:var(--stone);
  white-space:nowrap;
}

/* ---------- 11. 索引 ---------- */
.index-rail{
  position:sticky;
  top:104px;
  padding:22px 20px;
  border:1px solid rgba(201,162,39,.30);
  border-radius:var(--radius-lg);
  background:linear-gradient(180deg,rgba(18,48,42,.96),rgba(10,29,24,.96));
  color:rgba(243,238,223,.80);
  backdrop-filter:blur(12px);
  box-shadow:var(--shadow-float);
}
.index-rail__title{
  margin-bottom:14px;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.2em;
  color:var(--gold-bright);
}
.index-rail__list{display:grid;gap:2px}
.index-rail__link{
  display:flex;
  align-items:baseline;
  gap:10px;
  padding:8px 10px;
  border-left:2px solid transparent;
  border-radius:var(--radius);
  font-size:14.5px;
  line-height:1.5;
  transition:color .2s var(--ease),background .2s var(--ease),border-color .2s var(--ease);
}
.index-rail__link:hover{color:var(--gold-bright);background:rgba(232,199,102,.08)}
.index-rail__link[aria-current="true"]{
  color:var(--gold-bright);
  border-left-color:var(--gold);
  background:rgba(232,199,102,.10);
}
.index-rail__num{
  flex:0 0 auto;
  font-family:var(--font-mono);
  font-size:11.5px;
  letter-spacing:.06em;
  color:rgba(232,199,102,.70);
}
.chip-row{
  display:flex;
  gap:8px;
  overflow-x:auto;
  padding:4px 2px 12px;
  -webkit-overflow-scrolling:touch;
  scrollbar-width:thin;
}
.chip{
  flex:0 0 auto;
  padding:7px 15px;
  border:1px solid rgba(201,162,39,.42);
  border-radius:999px;
  background:rgba(18,48,42,.92);
  color:rgba(243,238,223,.85);
  font-size:13px;
  line-height:1.4;
  white-space:nowrap;
  transition:background .2s var(--ease),color .2s var(--ease),border-color .2s var(--ease);
}
.chip:hover,.chip[aria-current="true"]{
  background:linear-gradient(180deg,var(--gold-bright),var(--gold));
  border-color:var(--gold-bright);
  color:var(--ink);
}

/* ---------- 12. 主题筛选 ---------- */
.filter-bar{
  display:flex;
  flex-wrap:wrap;
  gap:8px;
  padding:10px;
  border:var(--line-soft);
  border-radius:var(--radius);
  background:rgba(229,221,200,.48);
  margin-bottom:28px;
}
.filter-btn{
  padding:7px 15px;
  border:1px solid transparent;
  border-radius:var(--radius);
  background:var(--moss);
  color:rgba(243,238,223,.88);
  font-size:13.5px;
  line-height:1.4;
  cursor:pointer;
  transition:background .2s var(--ease),color .2s var(--ease),
             border-color .2s var(--ease),box-shadow .2s var(--ease);
}
.filter-btn:hover{border-color:var(--gold-bright)}
.filter-btn.is-active{
  background:linear-gradient(180deg,var(--gold-bright),var(--gold));
  border-color:var(--gold-bright);
  color:#14201a;
  font-weight:500;
  box-shadow:inset 0 0 0 1px rgba(10,29,24,.16);
}
.filter-btn__count{
  margin-left:6px;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.06em;
  opacity:.72;
}
[data-filter-key]{
  transition:opacity .18s ease,transform .18s ease;
}
[data-filter-key].is-filtered-out{
  opacity:0;
  transform:translateY(-4px);
}

/* ---------- 13. 卡片与标签 ---------- */
.card{
  position:relative;
  padding:20px 22px;
  border:var(--line-soft);
  border-radius:var(--radius);
  background:rgba(229,221,200,.62);
  transition:border-color .2s var(--ease),box-shadow .2s var(--ease),background .2s var(--ease);
}
.card:hover{
  border-color:rgba(201,162,39,.85);
  background:rgba(229,221,200,.82);
  box-shadow:0 10px 26px -22px rgba(10,29,24,.9);
}
.card__num{
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.1em;
  color:var(--stone);
}
.card__title{
  margin:6px 0 8px;
  font-family:var(--font-display);
  font-size:18px;
  font-weight:700;
  line-height:1.4;
  color:var(--pine);
}
.card__meta{
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.06em;
  color:var(--stone);
}

.num-tag{
  display:inline-flex;
  align-items:baseline;
  gap:8px;
  padding:3px 10px 3px 9px;
  border-left:4px solid var(--gold);
  border-radius:var(--radius);
  background:rgba(10,29,24,.07);
  color:var(--pine);
  font-family:var(--font-mono);
  font-size:12.5px;
  letter-spacing:.08em;
  line-height:1.6;
}
.num-tag--red{border-left-color:var(--cinnabar)}
.num-tag--clay{border-left-color:var(--clay)}
.num-tag--moss{border-left-color:var(--moss)}

.tag{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:2px 9px;
  border:1px solid currentColor;
  border-radius:var(--radius);
  font-size:12px;
  line-height:1.7;
  letter-spacing:.04em;
}
.tag--gold{color:#8a6c12;background:rgba(201,162,39,.15);border-color:rgba(201,162,39,.55)}
.tag--red{color:var(--cinnabar);background:rgba(178,58,46,.10);border-color:rgba(178,58,46,.45)}
.tag--moss{color:var(--moss);background:rgba(31,75,62,.10);border-color:rgba(31,75,62,.42)}
.tag--clay{color:#8a5b41;background:rgba(169,118,90,.16);border-color:rgba(169,118,90,.52)}

/* ---------- 14. 图片位 ---------- */
.media-frame{
  position:relative;
  display:block;
  width:100%;
  aspect-ratio:16 / 9;
  overflow:hidden;
  border:1px solid rgba(110,124,116,.35);
  border-radius:var(--radius);
  background:
    linear-gradient(140deg,rgba(31,75,62,.92) 0%,rgba(10,29,24,.96) 54%,rgba(169,118,90,.62) 100%);
}
.media-frame::after{
  content:"";
  position:absolute;
  inset:10px;
  border:1px solid rgba(232,199,102,.22);
  border-radius:2px;
  pointer-events:none;
}
.media-frame > img,
.media-frame > svg,
.media-frame > picture,
.media-frame > picture > img{
  width:100%;
  height:100%;
  object-fit:cover;
}
.media-frame--wide{aspect-ratio:21 / 9}
.media-frame--tall{aspect-ratio:3 / 4}
.media-frame--square{aspect-ratio:1 / 1}
.media-frame__label{
  position:absolute;
  left:14px;
  bottom:12px;
  padding-left:9px;
  border-left:3px solid var(--gold);
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.14em;
  color:rgba(243,238,223,.78);
}

/* ---------- 15. 显现 ---------- */
.has-js [data-reveal]{
  opacity:0;
  transform:translateX(-8px);
  transition:opacity .24s var(--ease),transform .24s var(--ease);
}
.has-js [data-reveal].is-in{
  opacity:1;
  transform:none;
}

/* ---------- 16. 页脚 ---------- */
.site-footer{
  margin-top:96px;
  padding:64px var(--pad-x) 28px;
  border-top:1px solid rgba(201,162,39,.34);
  background:
    radial-gradient(circle at 88% -20%, rgba(31,75,62,.75), transparent 58%),
    radial-gradient(circle at 4% 112%, rgba(169,118,90,.30), transparent 52%),
    linear-gradient(180deg,#0A1D18 0%,#081713 100%);
  color:rgba(243,238,223,.76);
  font-size:14.5px;
  line-height:1.7;
}
.site-footer__inner{
  max-width:var(--w-max);
  margin-inline:auto;
  display:grid;
  grid-template-columns:minmax(240px,5fr) 7fr;
  gap:clamp(28px,4vw,64px);
  align-items:start;
}
.footer-brand__seal{
  display:grid;
  place-items:center;
  width:46px;
  height:46px;
  margin-bottom:16px;
  border:1px solid rgba(232,199,102,.82);
  border-radius:var(--radius);
  background:linear-gradient(158deg,rgba(232,199,102,.20),rgba(232,199,102,0) 72%);
  color:var(--gold-bright);
  font-family:var(--font-mono);
  font-size:15px;
  letter-spacing:.03em;
  line-height:1;
}
.footer-brand__name{
  margin-bottom:6px;
  font-family:var(--font-display);
  font-size:22px;
  font-weight:700;
  letter-spacing:.06em;
  color:var(--paper);
}
.footer-brand__line{
  margin-bottom:20px;
  font-size:11.5px;
  letter-spacing:.16em;
  color:rgba(232,199,102,.74);
}
.footer-brand__motto{
  padding-left:12px;
  border-left:2px solid rgba(201,162,39,.62);
  color:rgba(243,238,223,.62);
  font-size:13.5px;
  letter-spacing:.06em;
}
.footer-cols{
  display:grid;
  grid-template-columns:1fr 1fr 1.5fr;
  gap:clamp(20px,3vw,40px);
}
.footer-col__title{
  margin-bottom:14px;
  padding-bottom:10px;
  border-bottom:1px solid rgba(243,238,223,.14);
  font-family:var(--font-mono);
  font-size:11px;
  font-weight:400;
  letter-spacing:.2em;
  color:var(--gold-bright);
}
.footer-col__list{display:grid;gap:2px}
.footer-col__link{
  display:inline-block;
  padding:5px 0;
  border-bottom:1px solid transparent;
  color:rgba(243,238,223,.78);
  font-size:14.5px;
  transition:color .2s var(--ease),border-color .2s var(--ease);
}
.footer-col__link:hover{color:var(--gold-bright);border-bottom-color:rgba(232,199,102,.7)}
.footer-meta{
  padding:5px 0;
  color:rgba(243,238,223,.66);
  font-size:13.5px;
  line-height:1.65;
  word-break:break-word;
}
.footer-meta.mono{
  font-size:12.5px;
  letter-spacing:.06em;
  color:rgba(232,199,102,.84);
}
.footer-col--contact .footer-col__list{gap:0}
.site-footer__legal{
  max-width:var(--w-max);
  margin:44px auto 0;
  padding-top:20px;
  border-top:1px solid rgba(243,238,223,.12);
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:12px 24px;
  font-size:12.5px;
  color:rgba(243,238,223,.50);
}
.legal-line{display:flex;align-items:center;gap:4px;flex-wrap:wrap}
.legal-line .mono{font-size:12px;letter-spacing:.08em;color:rgba(243,238,223,.58)}
.legal-links{display:flex;flex-wrap:wrap;gap:6px 18px}
.legal-links a{
  color:rgba(243,238,223,.62);
  border-bottom:1px solid transparent;
  transition:color .2s var(--ease),border-color .2s var(--ease);
}
.legal-links a:hover{color:var(--gold-bright);border-bottom-color:rgba(232,199,102,.7)}
.legal-year{margin-left:auto;font-size:12px;letter-spacing:.08em;color:rgba(243,238,223,.46)}

/* ---------- 17. 响应式 ---------- */
@media (max-width:1024px){
  :root{--pad-x:32px}
  .grid-split{grid-template-columns:1fr}
  .index-rail{position:static;top:auto}
  .site-footer__inner{grid-template-columns:1fr}
  .footer-cols{grid-template-columns:1fr 1fr}
  .footer-col--contact{grid-column:1 / -1}
}

@media (max-width:960px){
  :root{--pad-x:20px}

  .site-header{padding:12px var(--pad-x) 12px}
  .site-header.is-condensed{padding-top:8px;padding-bottom:8px}
  .site-header__inner{gap:12px}
  .brand{padding:6px 14px 6px 6px;gap:10px}
  .brand__seal{width:32px;height:32px;font-size:12px}
  .brand__name{font-size:15px}
  .brand__sub{font-size:10px}

  .nav-toggle{display:inline-flex}

  .site-nav{
    position:absolute;
    left:var(--pad-x);
    right:var(--pad-x);
    top:calc(100% + 10px);
    flex-direction:column;
    align-items:stretch;
    gap:10px;
    padding:14px;
    border-radius:18px;
    background:rgba(10,29,24,.96);
    box-shadow:0 24px 48px -30px rgba(0,0,0,.9);
    opacity:0;
    visibility:hidden;
    transform:translateY(-6px);
    transition:opacity .2s var(--ease),transform .2s var(--ease),visibility .2s var(--ease);
  }
  .site-header[data-open="true"] .site-nav{
    opacity:1;
    visibility:visible;
    transform:translateY(0);
  }
  .site-nav__list{flex-direction:column;align-items:stretch;gap:2px}
  .site-nav__link{
    padding:11px 14px;
    border-radius:10px;
    font-size:15px;
    color:rgba(243,238,223,.88);
  }
  .site-nav__link[aria-current="page"]{
    color:var(--ink);
    border-color:transparent;
  }
  .site-nav__cta{width:100%;margin-left:0}

  .sec-head{flex-wrap:wrap;gap:10px 14px}
  .sec-kicker{margin-left:0;width:100%}
  .rule{margin:48px 0}
  .site-footer{padding:48px var(--pad-x) 24px;margin-top:72px}
}

@media (max-width:640px){
  h1{font-size:clamp(28px,8vw,34px)}
  .footer-cols{grid-template-columns:1fr}
  .footer-col--contact{grid-column:auto}
  .site-footer__legal{flex-direction:column;align-items:flex-start;gap:10px}
  .legal-year{margin-left:0}
  .filter-bar{padding:8px}
  .filter-btn{font-size:13px;padding:6px 13px}
}

/* ---------- 18. 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;
  }
  .has-js [data-reveal]{opacity:1;transform:none}
  [data-filter-key]{transition:opacity .01ms linear}
}