/* ============================================================
   九娱乐会馆 · 共享站点样式 /assets/site.css
   墨黑 + 暖铜金 / 蓝图网格 / 夜宴会馆
   ============================================================ */

/* ---------- 1. 设计令牌 ---------- */
:root{
  --ink:#0B0C0E;
  --charcoal:#15171B;
  --copper:#C89B5A;
  --gold:#E7C98A;
  --vermillion:#D24B36;
  --steel:#7C93A1;
  --mist:#A7ADB5;
  --ivory:#F3EFE6;
  --line:#2A3038;
  --deep-blue-gray:#1E2A33;

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

  --wrap:1200px;
  --gutter:clamp(1rem,4vw,3rem);
  --shadow-brut:6px 6px 0 rgba(0,0,0,.55);
  --ease:cubic-bezier(.22,.68,.32,1);
}

/* ---------- 2. Reset ---------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;background:var(--ink)}
body{
  margin:0;
  min-height:100vh;
  background:var(--ink);
  color:var(--ivory);
  font-family:var(--font-body);
  font-size:1rem;
  line-height:1.75;
  font-weight:400;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
h1,h2,h3,h4,p,ul,ol,figure,blockquote,dl,dd{margin:0}
ul,ol{padding:0;list-style:none}
img,svg{display:block;max-width:100%}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
a{color:inherit;text-decoration:none}
[hidden]{display:none !important}
table{border-collapse:collapse}
::selection{background:var(--copper);color:#0B0C0E}

/* ---------- 3. 排版基础 ---------- */
h1,h2,h3,h4{font-family:var(--font-display);font-weight:700;line-height:1.24;color:var(--ivory)}
h1{font-size:clamp(2.2rem,5vw,4.8rem);font-weight:900;line-height:1.08}
h2{font-size:clamp(1.6rem,3vw,2.6rem)}
h3{font-size:1.25rem}
h4{font-size:1.0625rem;font-family:var(--font-body);font-weight:500}
p{max-width:72ch}
.mono,code,kbd{font-family:var(--font-mono);font-variant-numeric:tabular-nums}
.lede{font-size:clamp(1rem,1.5vw,1.125rem);line-height:1.85;color:var(--mist);max-width:60ch}
.eyebrow{
  display:flex;align-items:center;gap:.75rem;
  font-family:var(--font-mono);font-size:.75rem;letter-spacing:.18em;
  color:var(--copper);text-transform:none;
}
.eyebrow::before{content:"";width:32px;height:1px;background:linear-gradient(90deg,var(--copper),transparent)}
.sr-only{
  position:absolute;width:1px;height:1px;padding:0;margin:-1px;
  overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0;
}
:focus-visible{outline:2px solid var(--gold);outline-offset:3px}
#main-content{scroll-margin-top:140px}

/* ---------- 4. 布局容器 ---------- */
.wrap{width:100%;max-width:var(--wrap);margin-inline:auto;padding-inline:var(--gutter)}
.section{position:relative;padding-block:clamp(2.75rem,7vw,6rem)}
.section + .section{border-top:1px solid var(--line)}

/* ---------- 5. Skip link ---------- */
.skip-link{
  position:fixed;top:.75rem;left:.75rem;z-index:300;
  padding:.7rem 1.15rem;
  background:var(--gold);color:#0B0C0E;
  font-weight:500;font-size:.9375rem;
  border:1px solid #0B0C0E;
  box-shadow:var(--shadow-brut);
  transform:translateY(-180%);
  transition:transform .22s var(--ease);
}
.skip-link:focus{transform:translateY(0)}

/* ---------- 6. 头部 ---------- */
.site-header{
  position:sticky;top:0;z-index:90;
  background:linear-gradient(180deg,#0B0C0E 0%,#0B0C0E 78%,#0F1114 100%);
  border-bottom:1px solid var(--line);
  box-shadow:0 1px 0 rgba(200,155,90,.28),0 22px 44px -30px rgba(0,0,0,.95);
}
.site-header::before{
  content:"";position:absolute;inset:0;pointer-events:none;z-index:0;
  background-image:linear-gradient(90deg,rgba(200,155,90,.055) 1px,transparent 1px);
  background-size:12.5% 100%;
}
.site-header > *{position:relative;z-index:1}

.header-top{
  display:flex;align-items:center;justify-content:space-between;gap:1rem;
  padding:.55rem var(--gutter);
  border-bottom:1px solid var(--line);
  font-family:var(--font-mono);font-size:.6875rem;letter-spacing:.14em;
  color:var(--mist);
}
.header-coord{display:flex;align-items:center;gap:.6rem;color:var(--steel);max-width:none}
.coord-dot{
  width:6px;height:6px;flex:0 0 auto;
  background:var(--vermillion);
  box-shadow:0 0 0 3px rgba(210,75,54,.16);
}
.header-actions{display:flex;align-items:center;gap:.5rem}

.icon-btn,.nav-toggle{
  display:inline-flex;align-items:center;gap:.45rem;
  padding:.5rem .8rem;
  border:1px solid var(--line);
  background:rgba(21,23,27,.85);
  color:var(--mist);
  font-family:var(--font-mono);font-size:.75rem;letter-spacing:.08em;
  transition:border-color .2s var(--ease),color .2s var(--ease),background .2s var(--ease);
}
.icon-btn:hover,.nav-toggle:hover,
.icon-btn[aria-expanded="true"],.nav-toggle[aria-expanded="true"]{
  border-color:var(--copper);color:var(--gold);background:rgba(200,155,90,.1);
}
.nav-toggle{display:none}
.nav-toggle-text{font-family:var(--font-mono);font-size:.6875rem;letter-spacing:.1em}
.nav-toggle-bars{position:relative;display:block;width:14px;height:10px}
.nav-toggle-bars::before,.nav-toggle-bars::after{
  content:"";position:absolute;left:0;right:0;height:1.5px;background:currentColor;
  transition:transform .25s var(--ease),top .25s var(--ease),bottom .25s var(--ease);
}
.nav-toggle-bars::before{top:0}
.nav-toggle-bars::after{bottom:0}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars::before{top:4.25px;transform:rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars::after{bottom:4.25px;transform:rotate(-45deg)}

/* 刊头 */
.masthead{
  position:relative;
  display:flex;justify-content:center;
  padding-block:clamp(.85rem,2.2vw,1.45rem);
}
.masthead::before,.masthead::after{
  content:"";position:absolute;top:50%;height:1px;
  width:clamp(0px,11vw,170px);
  background:linear-gradient(90deg,transparent,var(--line));
  pointer-events:none;
}
.masthead::before{left:var(--gutter)}
.masthead::after{right:var(--gutter);transform:scaleX(-1)}
.masthead-brand{display:inline-flex;align-items:center;gap:.85rem}
.brand-seal{
  display:grid;place-items:center;
  width:clamp(38px,5vw,50px);aspect-ratio:1;flex:0 0 auto;
  border:1px solid var(--copper);
  color:var(--gold);
  font-family:var(--font-display);font-weight:900;font-size:clamp(1.1rem,2vw,1.5rem);line-height:1;
  background:linear-gradient(150deg,rgba(200,155,90,.2),rgba(11,12,14,0));
  box-shadow:3px 3px 0 rgba(0,0,0,.6);
  transition:color .3s var(--ease),border-color .3s var(--ease),box-shadow .3s var(--ease);
}
.masthead-brand:hover .brand-seal,
.masthead-brand:focus-visible .brand-seal{
  color:var(--ivory);border-color:var(--gold);
  box-shadow:3px 3px 0 rgba(200,155,90,.4);
}
.brand-text{display:grid;gap:.15rem;text-align:left}
.brand-name{
  display:block;
  font-family:var(--font-display);font-weight:900;
  font-size:clamp(1.35rem,3.2vw,2.05rem);line-height:1.06;letter-spacing:.02em;
  color:var(--ivory);
}
.brand-tagline{
  display:block;
  font-family:var(--font-mono);font-size:.6875rem;letter-spacing:.09em;
  color:var(--mist);
}

/* 索引牌导航 */
.site-nav{border-top:1px solid rgba(200,155,90,.2)}
.nav-list{
  display:flex;flex-wrap:wrap;justify-content:center;
  max-width:var(--wrap);margin-inline:auto;padding-inline:var(--gutter);
}
.nav-item{flex:0 0 auto;border-left:1px solid transparent}
.nav-link{
  position:relative;
  display:flex;align-items:baseline;gap:.55rem;
  padding:.9rem 1.1rem;
  font-size:.9375rem;font-weight:500;color:var(--ivory);
  transition:color .2s var(--ease),background .2s var(--ease);
}
.nav-link::after{
  content:"";position:absolute;left:0;right:0;bottom:0;height:2px;
  background:linear-gradient(90deg,var(--copper),var(--gold));
  transform:scaleX(0);transform-origin:left center;
  transition:transform .3s var(--ease);
}
.nav-link:hover,.nav-link:focus-visible{color:var(--gold);background:rgba(200,155,90,.07)}
.nav-link:hover::after,.nav-link:focus-visible::after{transform:scaleX(1)}
.nav-link[aria-current="page"]{color:var(--gold);background:rgba(200,155,90,.12)}
.nav-link[aria-current="page"]::after{transform:scaleX(1)}
.nav-link[aria-current="page"] .nav-index{color:var(--gold);opacity:1}
.nav-index{
  font-family:var(--font-mono);font-size:.625rem;letter-spacing:.08em;
  color:var(--copper);opacity:.6;
}
.nav-item + .nav-item{border-left:1px solid var(--line)}

/* 检索浮层 */
.search-panel{
  position:absolute;top:100%;left:0;right:0;z-index:70;
  background:#0E1013;
  border-bottom:2px solid var(--copper);
  box-shadow:0 30px 60px -30px rgba(0,0,0,.95);
}
.search-inner{
  max-width:var(--wrap);margin-inline:auto;
  padding:1.1rem var(--gutter) 1.4rem;
}
.search-hint{
  display:block;
  font-family:var(--font-mono);font-size:.6875rem;letter-spacing:.14em;
  color:var(--steel);margin-bottom:.55rem;
}
.search-field{
  width:100%;padding:.85rem 1rem;
  background:var(--charcoal);
  border:1px solid var(--line);
  color:var(--ivory);
  font-family:var(--font-mono);font-size:.9375rem;
  transition:border-color .2s var(--ease),box-shadow .2s var(--ease);
}
.search-field::placeholder{color:var(--steel)}
.search-field:focus{
  outline:none;border-color:var(--copper);
  box-shadow:0 0 0 3px rgba(200,155,90,.2);
}
.search-results{
  display:grid;grid-template-columns:repeat(auto-fill,minmax(210px,1fr));
  gap:.5rem;margin-top:.9rem;max-height:44vh;overflow:auto;
}
.search-result{
  display:flex;align-items:center;justify-content:space-between;gap:.6rem;
  padding:.6rem .8rem;
  border:1px solid var(--line);
  background:rgba(21,23,27,.6);
  font-size:.875rem;color:var(--ivory);
  transition:border-color .2s var(--ease),background .2s var(--ease),color .2s var(--ease);
}
.search-result:hover,.search-result:focus-visible{
  border-color:var(--copper);color:var(--gold);background:rgba(200,155,90,.1);
}
.search-result-path{
  font-family:var(--font-mono);font-size:.6875rem;color:var(--steel);
}
.search-empty{
  margin-top:.9rem;
  font-size:.875rem;color:var(--mist);
}

/* ---------- 7. 页脚 ---------- */
.site-footer{
  position:relative;overflow:hidden;
  background:var(--ink);
  border-top:1px solid var(--copper);
  padding-top:clamp(2.5rem,6vw,4.5rem);
}
.site-footer::before{
  content:"";position:absolute;inset:0 0 auto;height:360px;pointer-events:none;
  background:radial-gradient(90% 130% at 50% 0%,rgba(200,155,90,.17),rgba(11,12,14,0) 66%);
}
.site-footer::after{
  content:"";position:absolute;inset:0;pointer-events:none;opacity:.5;
  background-image:
    linear-gradient(90deg,rgba(42,48,56,.9) 1px,transparent 1px),
    linear-gradient(180deg,rgba(42,48,56,.55) 1px,transparent 1px);
  background-size:12.5% 100%,100% 120px;
}
.site-footer .wrap{position:relative;z-index:1}

.footer-grid{
  display:grid;
  grid-template-columns:minmax(0,1.05fr) minmax(0,1.45fr);
  gap:clamp(2rem,5vw,4rem);
}
.footer-brand{display:grid;align-content:start;gap:.85rem;justify-items:start}
.footer-seal{
  display:grid;place-items:center;
  width:52px;height:52px;
  border:1px solid var(--copper);
  color:var(--gold);
  font-family:var(--font-display);font-weight:900;font-size:1.6rem;line-height:1;
  background:linear-gradient(150deg,rgba(200,155,90,.18),rgba(11,12,14,0));
  box-shadow:4px 4px 0 rgba(0,0,0,.6);
}
.footer-brand-name{
  font-family:var(--font-display);font-weight:700;font-size:1.35rem;line-height:1.2;
  color:var(--ivory);max-width:none;
}
.footer-brand-text{
  font-size:.9375rem;line-height:1.85;color:var(--mist);max-width:34ch;
}
.footer-cta{
  display:inline-flex;align-items:center;gap:.5rem;
  margin-top:.35rem;padding:.55rem 1rem;
  border:1px solid var(--copper);
  color:var(--gold);
  font-size:.8125rem;font-weight:500;
  transition:background .2s var(--ease),color .2s var(--ease),transform .2s var(--ease),box-shadow .2s var(--ease);
}
.footer-cta::after{content:"→";font-family:var(--font-mono);font-size:.875rem}
.footer-cta:hover,.footer-cta:focus-visible{
  background:var(--copper);color:#120E09;
  transform:translate(-2px,-2px);box-shadow:4px 4px 0 rgba(0,0,0,.6);
}

.footer-nav{
  display:grid;grid-template-columns:repeat(3,minmax(0,1fr));
  gap:1.5rem;
}
.footer-col{display:grid;align-content:start;gap:.9rem}
.footer-col-title{
  font-family:var(--font-mono);font-size:.75rem;font-weight:500;letter-spacing:.16em;
  color:var(--copper);
  padding-bottom:.6rem;border-bottom:1px solid var(--line);
}
.footer-link-list{display:grid;gap:.55rem}
.footer-link{
  display:inline-flex;align-items:center;gap:.5rem;
  font-size:.9375rem;color:var(--mist);
  transition:color .2s var(--ease);
}
.footer-link::before{
  content:"";width:8px;height:1px;flex:0 0 auto;
  background:var(--copper);opacity:.55;
  transition:width .2s var(--ease),opacity .2s var(--ease);
}
.footer-link:hover,.footer-link:focus-visible{color:var(--gold)}
.footer-link:hover::before,.footer-link:focus-visible::before{width:18px;opacity:1}
.footer-link[aria-current="page"]{color:var(--gold)}

.footer-contact{
  display:grid;grid-template-columns:repeat(auto-fit,minmax(220px,1fr));
  gap:1.2rem;
  margin-top:clamp(2rem,5vw,3rem);
  padding-top:1.6rem;
  border-top:1px solid var(--line);
}
.contact-item{display:grid;gap:.3rem;align-content:start}
.contact-label{
  font-family:var(--font-mono);font-size:.6875rem;letter-spacing:.14em;color:var(--steel);
}
.contact-value{
  display:flex;flex-wrap:wrap;align-items:center;gap:.6rem;
  font-size:.9375rem;color:var(--ivory);
}
.contact-text{word-break:break-word}
.copy-btn{
  padding:.15rem .5rem;
  border:1px solid var(--line);
  font-family:var(--font-mono);font-size:.6875rem;letter-spacing:.06em;
  color:var(--mist);
  transition:border-color .2s var(--ease),color .2s var(--ease),background .2s var(--ease);
}
.copy-btn:hover,.copy-btn:focus-visible{border-color:var(--copper);color:var(--gold);background:rgba(200,155,90,.12)}
.copy-btn[data-copied="true"]{border-color:var(--copper);color:var(--gold);background:rgba(200,155,90,.18)}
.footer-note{
  grid-column:1/-1;
  font-size:.8125rem;line-height:1.8;color:var(--steel);max-width:70ch;
}

.footer-bottom{
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;
  gap:.6rem 1.5rem;
  margin-top:2.2rem;padding-block:1.2rem;
  border-top:1px solid var(--line);
}
.footer-legal{
  font-family:var(--font-mono);font-size:.75rem;letter-spacing:.06em;color:var(--mist);
}
.footer-copy{
  font-family:var(--font-mono);font-size:.75rem;letter-spacing:.06em;color:var(--steel);
}

/* ---------- 8. 通用按钮 ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:.5em;
  padding:.8em 1.35em;
  border:1px solid var(--copper);
  background:transparent;color:var(--ivory);
  font-weight:500;font-size:.9375rem;line-height:1.2;
  transition:color .2s var(--ease),background .2s var(--ease),border-color .2s var(--ease),
             transform .2s var(--ease),box-shadow .2s var(--ease);
}
.btn:hover,.btn:focus-visible{
  color:var(--gold);border-color:var(--gold);
  transform:translate(-2px,-2px);
  box-shadow:4px 4px 0 rgba(200,155,90,.25);
}
.btn-primary{
  background:var(--copper);color:#120E09;border-color:var(--copper);
  box-shadow:5px 5px 0 rgba(0,0,0,.6);
}
.btn-primary:hover,.btn-primary:focus-visible{
  background:var(--gold);color:#120E09;border-color:var(--gold);
  box-shadow:6px 6px 0 rgba(0,0,0,.65);
}
.btn-ghost{color:var(--mist);border-color:var(--line)}
.btn-ghost:hover,.btn-ghost:focus-visible{color:var(--gold);border-color:var(--copper)}

/* ---------- 9. 面包屑 ---------- */
.breadcrumb{margin-block:1.25rem 0}
.breadcrumb ol{
  display:flex;flex-wrap:wrap;align-items:center;gap:.45rem;
  font-family:var(--font-mono);font-size:.75rem;letter-spacing:.06em;color:var(--mist);
}
.breadcrumb li{display:flex;align-items:center;gap:.45rem}
.breadcrumb li + li::before{content:"/";color:var(--line)}
.breadcrumb a{color:var(--mist);transition:color .2s var(--ease)}
.breadcrumb a:hover,.breadcrumb a:focus-visible{color:var(--gold)}
.breadcrumb [aria-current="page"]{color:var(--ivory)}

/* ---------- 10. 正文容器 ---------- */
.prose{max-width:68ch;color:var(--ivory)}
.prose > * + *{margin-top:1.15em}
.prose h2{font-size:clamp(1.4rem,2.4vw,1.9rem);margin-top:2.2em}
.prose h3{margin-top:1.8em}
.prose p{max-width:none;line-height:1.85}
.prose ul,.prose ol{display:grid;gap:.55em;padding-left:1.15em;list-style:none}
.prose li{position:relative;line-height:1.8;color:var(--mist)}
.prose li::before{
  content:"";position:absolute;left:-1.15em;top:.7em;
  width:8px;height:1px;background:var(--copper);
}
.prose a{color:var(--gold);text-decoration:underline;text-underline-offset:.22em;text-decoration-color:rgba(200,155,90,.5)}
.prose a:hover{text-decoration-color:var(--gold)}
.prose strong{color:var(--ivory);font-weight:500}
.prose blockquote{
  border-left:2px solid var(--copper);padding-left:1.1em;
  color:var(--mist);font-family:var(--font-display);
}

/* ---------- 11. 面板与标签 ---------- */
.panel{
  position:relative;
  padding:clamp(1.1rem,2.4vw,1.75rem);
  background:var(--charcoal);
  border:1px solid var(--line);
  box-shadow:var(--shadow-brut);
}
.panel--copper{
  border-color:rgba(200,155,90,.5);
  background:
    radial-gradient(120% 100% at 0% 0%,rgba(200,155,90,.16),rgba(21,23,27,0) 62%),
    var(--charcoal);
}
.tag{
  display:inline-flex;align-items:center;gap:.4em;
  padding:.18em .6em;
  border:1px solid currentColor;
  font-family:var(--font-mono);font-size:.6875rem;letter-spacing:.08em;
  color:var(--copper);
}
.tag--live{color:var(--vermillion)}
.tag--cool{color:var(--steel)}

/* ---------- 12. 数据表（费用 / 历史） ---------- */
.data-table{
  width:100%;
  background:var(--charcoal);
  border:1px solid var(--line);
  font-size:.9375rem;
}
.data-table caption{
  caption-side:top;text-align:left;
  font-family:var(--font-mono);font-size:.75rem;letter-spacing:.12em;
  color:var(--steel);padding-bottom:.6rem;
}
.data-table th,.data-table td{
  padding:.75rem .9rem;
  border-bottom:1px solid var(--line);
  text-align:left;vertical-align:top;line-height:1.6;
}
.data-table thead th{
  background:var(--deep-blue-gray);
  color:var(--steel);
  font-family:var(--font-mono);font-size:.75rem;font-weight:500;letter-spacing:.1em;
}
.data-table tbody tr:nth-child(even){background:rgba(30,42,51,.45)}
.data-table tbody tr:hover{background:rgba(200,155,90,.08)}
.data-table td.num,.data-table th.num{text-align:right;font-family:var(--font-mono);font-variant-numeric:tabular-nums}
.data-table tbody th{font-weight:500;color:var(--ivory)}

/* ---------- 13. 图片容器 ---------- */
.media-frame{
  position:relative;margin:0;overflow:hidden;
  aspect-ratio:var(--media-ratio,16 / 9);
  border:1px solid var(--line);
  background:
    radial-gradient(120% 100% at 50% 0%,rgba(200,155,90,.24),rgba(11,12,14,0) 62%),
    linear-gradient(160deg,var(--charcoal),var(--ink));
  box-shadow:var(--shadow-brut);
}
.media-frame img{width:100%;height:100%;object-fit:cover}
.media-frame::after{
  content:"";position:absolute;inset:.5rem;pointer-events:none;
  border:1px solid rgba(200,155,90,.18);
}
.media-frame--wide{--media-ratio:21 / 9}
.media-frame--tall{--media-ratio:3 / 4}
.media-frame--square{--media-ratio:1 / 1}
.media-frame .media-caption{
  position:absolute;left:0;right:0;bottom:0;z-index:1;
  padding:.75rem .9rem;
  font-family:var(--font-mono);font-size:.75rem;letter-spacing:.04em;
  color:var(--mist);
  background:linear-gradient(0deg,rgba(11,12,14,.94),rgba(11,12,14,0));
}

/* ---------- 14. 滚动显现 ---------- */
.reveal-ready [data-reveal]{
  opacity:0;transform:translateY(12px);
  transition:opacity .42s var(--ease),transform .42s var(--ease);
  transition-delay:calc(var(--reveal-i,0) * 60ms);
}
.reveal-ready [data-reveal].is-visible{opacity:1;transform:none}

/* ---------- 15. 响应式 ---------- */
@media (max-width:900px){
  .nav-toggle{display:inline-flex}
  .masthead::before,.masthead::after{display:none}
  .site-nav{
    position:absolute;top:100%;left:0;right:0;z-index:80;
    display:none;
    max-height:min(72vh,520px);overflow:auto;
    background:#0C0E11;
    border-bottom:2px solid var(--copper);
    box-shadow:0 30px 60px -30px rgba(0,0,0,.95);
  }
  .site-nav[data-open]{display:block}
  .nav-list{flex-direction:column;padding-inline:0}
  .nav-item{width:100%}
  .nav-item + .nav-item{border-left:0;border-top:1px solid var(--line)}
  .nav-link{justify-content:space-between;align-items:center;padding:1rem var(--gutter);font-size:1rem}
  .nav-link::after{left:var(--gutter);right:var(--gutter)}

  .footer-grid{grid-template-columns:1fr}
  .footer-nav{grid-template-columns:repeat(2,minmax(0,1fr))}
  .footer-brand-text{max-width:46ch}
  #main-content{scroll-margin-top:120px}
}

@media (max-width:640px){
  .header-top{font-size:.625rem;letter-spacing:.1em;padding-block:.5rem}
  .header-coord{font-size:.625rem}
  .brand-tagline{font-size:.625rem;letter-spacing:.05em}
  .footer-nav{grid-template-columns:1fr;gap:1.35rem}
  .footer-bottom{flex-direction:column;align-items:flex-start}
  .search-results{grid-template-columns:1fr;max-height:50vh}
  .media-frame{--media-ratio:4 / 3}
}

@media (max-width:380px){
  .brand-tagline{display:none}
  .nav-toggle-text{display:none}
}

/* ---------- 16. 动效偏好 ---------- */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  .reveal-ready [data-reveal]{
    opacity:1;transform:none;
    transition:none;transition-delay:0s;
  }
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
    transition-delay:0s !important;
    scroll-behavior:auto !important;
  }
  .btn:hover,.btn-primary:hover,.footer-cta:hover{transform:none}
}