/* ==========================================================================
   梦想棋牌局 · /assets/site.css
   共享外壳：边框式牌桌导航 + 页脚 + 基础组件
   ========================================================================== */

/* ---------- 1. Reset ---------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body,h1,h2,h3,h4,h5,p,ul,ol,li,figure,figcaption,blockquote,dl,dd{margin:0}
ul,ol{padding:0;list-style:none}
img,svg,picture,video{display:block;max-width:100%}
button{background:none;border:0;padding:0;cursor:pointer}
a{color:inherit;text-decoration:none}
summary{cursor:pointer}
[hidden]{display:none!important}
:focus-visible{outline:2px solid var(--gold-bright);outline-offset:3px;border-radius:4px}

/* ---------- 2. Tokens ---------- */
:root{
  --felt:#0E2B24;
  --ink-dark:#15110D;
  --cream:#F3E7D3;
  --linen:#DFCFAF;
  --gold:#C9A227;
  --gold-bright:#E8C766;
  --vermilion:#C0392B;
  --amber:#E08A2E;
  --cyan:#4FD1C5;
  --mist:#9DB3A8;
  --paper-ink:#2A2620;

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

  --frame-top:64px;
  --frame-rail:0px;
  --radius-s:12px;
  --radius-m:18px;
  --radius-l:26px;
}
@media (min-width:768px){:root{--frame-rail:44px}}
@media (min-width:1080px){:root{--frame-rail:236px}}

/* ---------- 3. Base ---------- */
body{
  min-height:100vh;
  background-color:var(--felt);
  background-image:
    radial-gradient(circle at 88% 3%, rgba(201,162,39,.16), transparent 42%),
    radial-gradient(circle at 3% 96%, rgba(79,209,197,.09), transparent 38%),
    repeating-linear-gradient(0deg, rgba(243,231,211,.026) 0 1px, transparent 1px 72px),
    repeating-linear-gradient(90deg, rgba(243,231,211,.026) 0 1px, transparent 1px 72px);
  background-repeat:no-repeat,no-repeat,repeat,repeat;
  color:var(--mist);
  font:400 17px/1.8 var(--font-body);
  letter-spacing:.01em;
  overflow-x:hidden;
}
h1,h2,h3,h4{color:var(--cream);font-family:var(--font-display);font-weight:800;letter-spacing:-.02em;line-height:1.16}
strong{color:var(--cream);font-weight:700}

/* ---------- 4. 跳过链接 ---------- */
.skip-link{
  position:fixed;left:12px;top:-72px;z-index:120;
  padding:12px 18px;border-radius:0 0 12px 12px;
  background:var(--gold-bright);color:var(--ink-dark);
  font:600 15px/1 var(--font-body);letter-spacing:.04em;
  transition:top .2s ease;
}
.skip-link:focus{top:0}

/* ---------- 5. 边框头部 ---------- */
.site-header{position:fixed;top:0;left:0;right:0;z-index:60}

.frame-top{
  position:relative;
  display:flex;align-items:center;gap:12px;
  min-height:var(--frame-top);
  padding:10px 14px;
  background:linear-gradient(180deg,#1A1510 0%,#15110D 100%);
  border-bottom:1px solid rgba(201,162,39,.32);
  box-shadow:0 10px 30px rgba(4,10,8,.45);
}
@media (min-width:768px){.frame-top{padding:10px 22px;gap:18px}}

.brand{display:flex;align-items:center;gap:12px;min-width:0;border-radius:14px}
.brand:hover .brand-seal{transform:rotate(-6deg) scale(1.05)}
.brand-seal{
  display:grid;place-items:center;flex:0 0 auto;
  width:40px;height:40px;border-radius:12px;
  border:1px solid var(--gold);
  background:radial-gradient(circle at 32% 26%, rgba(232,199,102,.28), rgba(0,0,0,.36));
  color:var(--gold-bright);
  font:800 20px/1 var(--font-display);
  transition:transform .3s ease;
}
.brand-seal--lg{width:52px;height:52px;border-radius:14px;font-size:26px}
.brand-text{display:flex;flex-direction:column;gap:2px;min-width:0;line-height:1.15}
.brand-name{font:800 19px/1.15 var(--font-display);color:var(--cream);letter-spacing:.02em;white-space:nowrap}
.brand-sub{display:none;font:400 11px/1.4 var(--font-body);letter-spacing:.16em;color:var(--gold);white-space:nowrap}
@media (min-width:430px){.brand-sub{display:block}}

.brand-note{
  display:none;font:400 12px/1.5 var(--font-mono);
  letter-spacing:.12em;color:rgba(157,179,168,.8);white-space:nowrap;
}
@media (min-width:1180px){.brand-note{display:block}}

.frame-chapter{display:none;align-items:baseline;gap:8px;margin-left:auto}
@media (min-width:1080px){.frame-chapter{display:inline-flex}}
.frame-chapter-label{font:400 12px/1 var(--font-body);letter-spacing:.2em;color:var(--mist)}
.frame-chapter-value{font:500 16px/1 var(--font-mono);letter-spacing:.06em;color:var(--gold-bright)}

.header-actions{display:flex;align-items:center;gap:8px;margin-left:auto;min-width:0}
@media (min-width:1080px){.header-actions{margin-left:0}}
.header-actions .chip{display:none}
.header-actions .chip--red{display:inline-flex}
@media (min-width:800px){.header-actions .chip{display:inline-flex}}

.chip{
  display:inline-flex;align-items:center;gap:8px;
  padding:9px 15px;border-radius:999px;
  font:500 14px/1 var(--font-body);letter-spacing:.04em;white-space:nowrap;
  border:1px solid rgba(201,162,39,.34);
  background:rgba(243,231,211,.04);
  color:var(--cream);
  transition:transform .2s ease,background .2s ease,border-color .2s ease,color .2s ease;
}
.chip:hover{transform:translateY(-2px)}
.chip--gold{border-color:rgba(201,162,39,.7);background:rgba(201,162,39,.12);color:var(--gold-bright)}
.chip--gold:hover{background:rgba(201,162,39,.24)}
.chip--amber{border-color:rgba(224,138,46,.6);background:rgba(224,138,46,.12);color:#F0B064}
.chip--amber:hover{background:rgba(224,138,46,.24)}
.chip--red{border-color:rgba(192,57,43,.68);background:rgba(192,57,43,.16);color:#EC8073}
.chip--red:hover{background:rgba(192,57,43,.3)}
.chip--cyan{border-color:rgba(79,209,197,.5);background:rgba(79,209,197,.1);color:var(--cyan)}

.nav-toggle{
  display:inline-flex;align-items:center;gap:9px;
  padding:10px 15px;border-radius:999px;
  border:1px solid rgba(201,162,39,.45);
  background:rgba(201,162,39,.08);
  color:var(--gold-bright);
  font:600 14px/1 var(--font-body);letter-spacing:.08em;
  transition:background .2s ease,border-color .2s ease;
}
.nav-toggle:hover{background:rgba(201,162,39,.2);border-color:var(--gold-bright)}
.nav-toggle-bars{position:relative;display:block;width:16px;height:2px;border-radius:2px;background:currentColor}
.nav-toggle-bars::before,.nav-toggle-bars::after{content:"";position:absolute;left:0;right:0;height:2px;border-radius:2px;background:currentColor}
.nav-toggle-bars::before{top:-5px}
.nav-toggle-bars::after{top:5px}
.nav-toggle-text{display:none}
@media (min-width:768px){.nav-toggle-text{display:inline}}
@media (min-width:1080px){.nav-toggle{display:none}}

.read-progress{position:absolute;left:0;right:0;bottom:0;height:3px;background:rgba(243,231,211,.08)}
.read-progress-fill{
  display:block;height:100%;width:0;
  background:linear-gradient(90deg,var(--gold),var(--gold-bright));
  box-shadow:0 0 12px rgba(232,199,102,.6);
  transition:width .12s linear;
}

.nav-scrim{
  position:fixed;inset:0;z-index:65;
  background:rgba(5,12,10,.64);
  opacity:0;visibility:hidden;
  transition:opacity .28s ease,visibility 0s linear .28s;
}
[data-open] .nav-scrim{opacity:1;visibility:visible;transition:opacity .28s ease,visibility 0s}
@media (min-width:1080px){.nav-scrim{display:none}}

.rail-strip{display:none}
@media (min-width:768px){
  .rail-strip{
    display:block;position:fixed;left:0;top:var(--frame-top);bottom:0;width:44px;z-index:58;
    background:linear-gradient(180deg,#191410 0%,#120E0A 100%);
    border-right:1px solid rgba(201,162,39,.28);
  }
  .rail-strip-mark{
    position:absolute;top:50%;left:50%;
    width:10px;height:132px;transform:translate(-50%,-50%);border-radius:6px;
    background:repeating-linear-gradient(180deg, rgba(201,162,39,.55) 0 6px, transparent 6px 13px);
    opacity:.6;
  }
}
@media (min-width:1080px){.rail-strip{display:none}}

/* ---------- 6. 抽屉导航 ---------- */
.site-nav{
  position:fixed;left:0;right:0;bottom:0;z-index:70;
  max-height:84vh;overflow-y:auto;overscroll-behavior:contain;
  padding:20px 18px calc(26px + env(safe-area-inset-bottom,0px));
  background:linear-gradient(180deg,#1C1712 0%,#120E0A 100%);
  border-top:2px solid var(--gold);
  border-radius:var(--radius-l) var(--radius-l) 0 0;
  box-shadow:0 -18px 48px rgba(0,0,0,.6);
  transform:translateY(103%);
  visibility:hidden;
  transition:transform .32s cubic-bezier(.22,.7,.3,1),visibility 0s linear .33s;
}
.site-nav::before{
  content:"";display:block;width:52px;height:4px;border-radius:3px;
  margin:0 auto 16px;background:rgba(201,162,39,.5);
}
[data-open] .site-nav{
  transform:translateY(0);visibility:visible;
  transition:transform .32s cubic-bezier(.22,.7,.3,1),visibility 0s;
}

.nav-label{
  font:400 12px/1 var(--font-mono);letter-spacing:.2em;
  color:var(--gold);text-transform:uppercase;margin-bottom:14px;
}
.nav-list{display:grid;gap:4px}
.nav-item{min-width:0}
.nav-link{
  display:flex;align-items:center;gap:14px;
  padding:12px 13px;border-radius:var(--radius-s);
  border:1px solid transparent;
  color:var(--cream);
  transition:background .2s ease,border-color .2s ease,transform .2s ease,color .2s ease;
}
.nav-index{font:500 12px/1 var(--font-mono);letter-spacing:.1em;color:var(--gold);min-width:22px}
.nav-name{font:500 17px/1.25 var(--font-body);letter-spacing:.03em}
.nav-link:hover{background:rgba(201,162,39,.1);border-color:rgba(201,162,39,.34);transform:translateX(3px)}
.nav-link[aria-current="page"]{
  background:linear-gradient(90deg, rgba(201,162,39,.24), rgba(201,162,39,.04));
  border-color:var(--gold);color:#FFF8E9;
}
.nav-link[aria-current="page"] .nav-index{color:var(--gold-bright)}
.nav-link[aria-current="page"] .nav-name{font-weight:700}

.nav-foot{margin-top:22px;padding-top:16px;border-top:1px dashed rgba(201,162,39,.28)}
.nav-foot-link{
  display:inline-flex;align-items:center;gap:8px;
  font:600 15px/1 var(--font-body);letter-spacing:.04em;color:var(--gold-bright);
}
.nav-foot-link::after{content:"→";font-family:var(--font-mono);font-size:13px}
.nav-foot-link:hover{color:#FFF3D6}
.nav-foot-note{margin-top:8px;font:400 12px/1.6 var(--font-mono);letter-spacing:.1em;color:rgba(157,179,168,.85)}

@media (min-width:768px){
  .site-nav{
    left:0;right:auto;top:var(--frame-top);bottom:0;width:264px;
    max-height:none;border-radius:0;border-top:0;
    border-right:1px solid rgba(201,162,39,.28);
    padding:26px 18px 30px;
    box-shadow:18px 0 44px rgba(0,0,0,.45);
    transform:translateX(-102%);
  }
  .site-nav::before{display:none}
  [data-open] .site-nav{transform:translateX(0)}
}
@media (min-width:1080px){
  .site-nav{
    width:236px;transform:none;visibility:visible;box-shadow:none;
    transition:none;
  }
  .site-nav::before{display:none}
}

html.nav-open{overflow:hidden}
@media (min-width:1080px){html.nav-open{overflow:auto}}

/* ---------- 7. 正文容器 ---------- */
#main-content{
  display:block;
  max-width:calc(1280px + var(--frame-rail));
  margin-inline:auto;
  padding:calc(var(--frame-top) + 36px) 20px 88px calc(var(--frame-rail) + 20px);
}
@media (min-width:768px){#main-content{padding-right:28px;padding-bottom:104px}}
@media (min-width:1080px){#main-content{padding-right:40px;padding-bottom:120px}}

.wrap{max-width:100%}

/* ---------- 8. 面包屑 / 页头 ---------- */
.breadcrumbs{margin-bottom:26px}
.breadcrumbs-list{display:flex;flex-wrap:wrap;align-items:center;gap:10px}
.breadcrumbs-list li{display:flex;align-items:center;gap:10px}
.breadcrumbs-link{
  font:400 12px/1 var(--font-mono);letter-spacing:.16em;
  color:var(--mist);border-bottom:1px solid transparent;
}
.breadcrumbs-link:hover{color:var(--gold-bright);border-bottom-color:rgba(232,199,102,.6)}
.breadcrumbs-sep{font:400 12px/1 var(--font-mono);color:rgba(201,162,39,.6)}
.breadcrumbs-current{font:400 12px/1 var(--font-mono);letter-spacing:.16em;color:var(--gold)}

.page-head{margin-bottom:44px}

/* ---------- 9. 排版组件 ---------- */
.display{
  font:800 clamp(48px,9.2vw,132px)/.94 var(--font-display);
  letter-spacing:-.03em;color:var(--cream);
}
.index-label{
  display:inline-block;
  font:400 12px/1.6 var(--font-mono);letter-spacing:.22em;
  color:var(--gold);text-transform:uppercase;
}
.lede{max-width:64ch;font-size:18px;line-height:1.85;color:var(--linen)}
.note{font:400 13px/1.75 var(--font-body);color:rgba(157,179,168,.9)}
.num{font-family:var(--font-mono);letter-spacing:.02em;margin:0 .15em}

.rule{height:1px;border:0;margin:40px 0;background:linear-gradient(90deg,rgba(201,162,39,.55),rgba(201,162,39,0))}

/* ---------- 10. 章节 ---------- */
.section{position:relative;padding:52px 0}
@media (min-width:768px){.section{padding:64px 0}}
.section-head{display:flex;flex-wrap:wrap;gap:10px 18px;align-items:flex-start;margin-bottom:26px}
.section-index{
  font:500 13px/1.6 var(--font-mono);letter-spacing:.2em;color:var(--gold);
  padding-top:6px;
}
[data-chapter] .section-index{position:relative;padding-left:16px}
[data-chapter] .section-index::before{
  content:"";position:absolute;left:0;top:.42em;width:3px;height:1.1em;border-radius:2px;
  background:rgba(201,162,39,.28);
  transition:background .24s ease,box-shadow .24s ease;
}
[data-chapter].is-current .section-index{color:var(--gold-bright)}
[data-chapter].is-current .section-index::before{background:var(--gold-bright);box-shadow:0 0 10px rgba(232,199,102,.75)}
.section-title{font:800 clamp(28px,4.4vw,52px)/1.1 var(--font-display);letter-spacing:-.02em;color:var(--cream)}
.section-lede{flex:1 1 320px;max-width:62ch;margin-top:2px;color:var(--mist)}

/* ---------- 11. Bento 与卡片 ---------- */
.bento{display:grid;gap:20px;grid-template-columns:repeat(12,minmax(0,1fr))}
.bento>*{grid-column:span 12}
@media (min-width:720px){
  .bento>.span-3,.bento>.span-4,.bento>.span-6{grid-column:span 6}
}
@media (min-width:1080px){
  .bento>.span-3{grid-column:span 3}
  .bento>.span-4{grid-column:span 4}
  .bento>.span-6{grid-column:span 6}
  .bento>.span-8{grid-column:span 8}
}

.card{
  position:relative;
  display:block;height:100%;
  padding:22px;border-radius:var(--radius-m);
  border:1px solid rgba(201,162,39,.22);
  background:linear-gradient(160deg, rgba(243,231,211,.06), rgba(0,0,0,.18));
  color:var(--cream);
  transition:transform .24s ease,border-color .24s ease,box-shadow .24s ease;
}
.card:hover{transform:translateY(-4px);border-color:var(--gold-bright);box-shadow:0 18px 38px rgba(0,0,0,.4)}
.card--felt{background:linear-gradient(165deg,#123529 0%,#0C241E 100%)}
.card--focus{border-color:var(--gold);box-shadow:0 0 0 1px rgba(201,162,39,.35),0 18px 40px rgba(0,0,0,.35)}
.card--paper{background:var(--cream);border-color:rgba(42,38,32,.16);color:var(--paper-ink)}
.card--paper .index-label,.card--paper .stat-value{color:#8A6A12}
.card--paper h3,.card--paper h2,.card--paper strong{color:var(--paper-ink)}
.card>*+*{margin-top:12px}

/* ---------- 12. 按钮 ---------- */
.btn{
  display:inline-flex;align-items:center;gap:10px;
  padding:13px 22px;border-radius:999px;
  border:1px solid transparent;
  font:600 16px/1 var(--font-body);letter-spacing:.04em;
  transition:transform .2s ease,box-shadow .2s ease,background .2s ease,border-color .2s ease,color .2s ease;
}
.btn:hover{transform:translateY(-2px)}
.btn--gold{
  background:linear-gradient(140deg,var(--gold-bright),var(--gold));
  color:#191410;box-shadow:0 12px 26px rgba(201,162,39,.24);
}
.btn--gold:hover{box-shadow:0 16px 32px rgba(201,162,39,.36)}
.btn--outline{border-color:rgba(201,162,39,.55);background:rgba(201,162,39,.07);color:var(--gold-bright)}
.btn--outline:hover{background:rgba(201,162,39,.18);border-color:var(--gold-bright)}
.btn--amber{border-color:rgba(224,138,46,.62);background:rgba(224,138,46,.14);color:#F0B064}
.btn--amber:hover{background:rgba(224,138,46,.26)}
.btn--red{border-color:rgba(192,57,43,.68);background:rgba(192,57,43,.18);color:#EC8073}
.btn--red:hover{background:rgba(192,57,43,.3)}
.btn--paper{background:var(--cream);color:var(--paper-ink);box-shadow:0 12px 26px rgba(0,0,0,.22)}

/* ---------- 13. 标签 / 数字 ---------- */
.tag{
  display:inline-flex;align-items:center;gap:6px;
  padding:5px 11px;border-radius:999px;
  font:500 12px/1 var(--font-mono);letter-spacing:.1em;
  border:1px solid rgba(201,162,39,.4);
  background:rgba(201,162,39,.09);color:var(--gold-bright);
}
.tag--amber{border-color:rgba(224,138,46,.55);background:rgba(224,138,46,.12);color:#F0B064}
.tag--red{border-color:rgba(192,57,43,.6);background:rgba(192,57,43,.15);color:#EC8073}
.tag--cyan{border-color:rgba(79,209,197,.5);background:rgba(79,209,197,.1);color:var(--cyan)}

.stat{display:grid;gap:6px;align-content:start}
.stat-value{font:500 clamp(28px,4.6vw,46px)/1 var(--font-mono);letter-spacing:-.01em;color:var(--gold-bright)}
.stat-label{font:400 12px/1.6 var(--font-mono);letter-spacing:.2em;color:var(--mist)}

/* ---------- 14. 折叠面板 ---------- */
.panel{
  border:1px solid rgba(201,162,39,.24);
  border-radius:var(--radius-m);
  background:rgba(21,17,13,.55);
  overflow:hidden;
}
.panel+.panel{margin-top:12px}
.panel-head{
  display:flex;align-items:center;gap:14px;
  padding:18px 20px;
  font:600 17px/1.45 var(--font-body);color:var(--cream);
  list-style:none;
}
.panel-head::-webkit-details-marker{display:none}
.panel-head::after{
  content:"+";margin-left:auto;
  font:400 20px/1 var(--font-mono);color:var(--gold);
}
.panel[open]>.panel-head::after{content:"–"}
.panel[open]>.panel-head{color:var(--gold-bright)}
.panel-body{
  padding:0 20px 20px;color:var(--mist);font-size:16px;
  animation:panelIn .26s ease-out both;
}
@keyframes panelIn{from{opacity:0;transform:translateY(-4px)}to{opacity:1;transform:none}}

/* ---------- 15. 标签页 / 筛选 ---------- */
.tabs{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:22px}
.tab{
  padding:11px 18px;border-radius:999px;
  border:1px solid rgba(201,162,39,.3);
  background:rgba(243,231,211,.03);
  color:var(--mist);
  font:500 15px/1 var(--font-body);letter-spacing:.04em;
  transition:background .2s ease,color .2s ease,border-color .2s ease;
}
.tab:hover{border-color:var(--gold);color:var(--cream)}
.tab[aria-selected="true"]{
  background:linear-gradient(140deg,var(--gold-bright),var(--gold));
  border-color:transparent;color:#15110D;
}
.step-panel{animation:panelIn .26s ease-out both}

.filter-bar{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:22px}
.filter-btn{
  padding:8px 14px;border-radius:999px;
  border:1px solid rgba(201,162,39,.28);
  background:rgba(243,231,211,.03);
  color:var(--mist);
  font:500 13px/1 var(--font-mono);letter-spacing:.08em;
  transition:background .2s ease,color .2s ease,border-color .2s ease;
}
.filter-btn:hover{border-color:var(--gold);color:var(--cream)}
.filter-btn[aria-pressed="true"]{
  background:rgba(201,162,39,.18);
  border-color:var(--gold);color:var(--gold-bright);
}

/* ---------- 16. 图片容器 ---------- */
.media-frame{
  position:relative;overflow:hidden;
  border-radius:var(--radius-m);
  border:1px solid rgba(201,162,39,.24);
  aspect-ratio:4/3;
  background:
    radial-gradient(circle at 72% 18%, rgba(79,209,197,.14), transparent 55%),
    linear-gradient(140deg,#123529 0%,#0A1F1A 58%,#15110D 100%);
}
.media-frame>img,
.media-frame>picture>img{width:100%;height:100%;object-fit:cover}
.media-frame::after{
  content:"";position:absolute;inset:0;pointer-events:none;
  background:linear-gradient(180deg,rgba(0,0,0,0) 52%,rgba(10,20,16,.62) 100%);
}
.media-frame--wide{aspect-ratio:16/9}
.media-frame--tall{aspect-ratio:4/5}
.media-frame--square{aspect-ratio:1/1}
.media-caption{
  margin-top:10px;
  font:400 12px/1.7 var(--font-mono);letter-spacing:.1em;color:var(--mist);
}

/* ---------- 17. 显现动效 ---------- */
[data-reveal]{
  opacity:0;transform:translateY(12px);
  transition:opacity .24s ease-out,transform .24s ease-out;
  transition-delay:calc(var(--reveal-delay,0) * 40ms);
}
[data-reveal].is-in{opacity:1;transform:none}

/* ---------- 18. 页脚 ---------- */
.site-footer{
  position:relative;
  background:linear-gradient(180deg,#171310 0%,#0F0B08 100%);
  color:var(--mist);
  border-top:1px solid rgba(201,162,39,.3);
}
.site-footer::before{
  content:"";display:block;height:10px;opacity:.5;
  background:repeating-linear-gradient(90deg,
    rgba(201,162,39,.4) 0 10px, transparent 10px 20px,
    rgba(79,209,197,.18) 20px 30px, transparent 30px 40px);
}
.footer-inner{
  max-width:calc(1280px + var(--frame-rail));
  margin-inline:auto;
  padding:46px 20px 30px calc(var(--frame-rail) + 20px);
}
@media (min-width:768px){.footer-inner{padding-right:28px;padding-top:56px}}
@media (min-width:1080px){.footer-inner{padding-right:40px}}

.footer-grid{display:grid;gap:30px;grid-template-columns:1fr}
@media (min-width:620px){.footer-grid{grid-template-columns:1fr 1fr}}
@media (min-width:1024px){.footer-grid{grid-template-columns:1.15fr .8fr .8fr .8fr 1.5fr;gap:26px}}

.footer-brand{display:grid;gap:12px;align-content:start}
.footer-name{font:800 22px/1.2 var(--font-display);letter-spacing:.02em;color:var(--cream)}
.footer-line{font:400 14px/1.7 var(--font-body);color:var(--mist)}

.footer-col{display:grid;gap:12px;align-content:start}
.footer-col-title{
  font:400 12px/1 var(--font-mono);letter-spacing:.2em;
  color:var(--gold);text-transform:uppercase;font-weight:400;
}
.footer-links{display:grid;gap:9px}
.footer-links a{
  font:400 15px/1.5 var(--font-body);color:var(--mist);
  border-bottom:1px solid transparent;
  transition:color .2s ease,border-color .2s ease;
}
.footer-links a:hover{color:var(--gold-bright);border-bottom-color:rgba(232,199,102,.55)}

.footer-contact{display:grid;gap:12px;align-content:start}
.contact-line{
  display:flex;flex-wrap:wrap;align-items:center;gap:10px;
  padding-bottom:8px;border-bottom:1px dashed rgba(201,162,39,.18);
}
.contact-key{
  flex:0 0 auto;min-width:32px;
  font:400 12px/1.6 var(--font-mono);letter-spacing:.16em;color:var(--gold);
}
.contact-value{
  flex:1 1 180px;min-width:0;
  font:400 14px/1.7 var(--font-body);color:var(--cream);
  word-break:break-all;
}
.contact-line--wide .contact-value{flex:1 1 100%}
.copy-btn{
  flex:0 0 auto;
  padding:6px 12px;border-radius:999px;
  border:1px solid rgba(224,138,46,.5);
  background:rgba(224,138,46,.1);
  color:#F0B064;
  font:500 12px/1 var(--font-mono);letter-spacing:.08em;
  transition:background .2s ease,border-color .2s ease;
}
.copy-btn:hover{background:rgba(224,138,46,.24);border-color:#F0B064}
.copy-btn[data-done]{border-color:var(--gold-bright);color:var(--gold-bright)}

.footer-note{font:400 12px/1.75 var(--font-mono);letter-spacing:.06em;color:rgba(157,179,168,.85)}

.footer-legal{
  display:flex;flex-wrap:wrap;align-items:center;gap:12px 22px;
  margin-top:40px;padding-top:22px;
  border-top:1px solid rgba(201,162,39,.2);
}
.legal-line{font:400 12px/1.7 var(--font-mono);letter-spacing:.1em;color:var(--gold)}
.legal-line--muted{color:rgba(157,179,168,.8)}

.to-top{
  margin-left:auto;
  padding:10px 16px;border-radius:999px;
  border:1px solid rgba(201,162,39,.45);
  background:rgba(21,17,13,.9);
  color:var(--gold-bright);
  font:500 12px/1 var(--font-mono);letter-spacing:.14em;
  opacity:0;visibility:hidden;transform:translateY(6px);
  transition:opacity .24s ease,transform .24s ease,visibility 0s linear .24s;
}
.to-top[data-visible]{
  opacity:1;visibility:visible;transform:none;
  transition:opacity .24s ease,transform .24s ease,visibility 0s;
}
.to-top:hover{background:rgba(201,162,39,.2)}

/* ---------- 19. 降级动效 ---------- */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms!important;
    animation-iteration-count:1!important;
    transition-duration:.001ms!important;
    transition-delay:0ms!important;
  }
  [data-reveal]{opacity:1;transform:none}
  .card:hover,.chip:hover,.btn:hover,.nav-link:hover{transform:none}
}