/* ============================================================
   9393网页 · 共享样式 /assets/site.css
   设计语言：深靛蓝精密控制台 × 展览画册展签
   ============================================================ */

/* ---------- 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,figure,blockquote,dl,dd{margin:0}
ul,ol{padding:0;list-style:none}
img,svg,video{display:block;max-width:100%}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
a{color:inherit;text-decoration:none}
table{border-collapse:collapse}

/* ---------- 变量 ---------- */
:root{
  --ink:#10162F;
  --ink-deep:#0A0E20;
  --layer:#1B2450;
  --layer-hi:#2E3B7A;
  --action:#FF6B2C;
  --alert:#D94A2B;
  --lime:#B8E34B;
  --lime-ink:#4A6410;
  --paper:#FAF6EE;
  --cream:#F1E7D7;
  --mist:#B8BFD1;
  --text:#241C18;
  --on-ink:#F5F0E6;
  --on-ink-dim:#C3C9DA;
  --line-dark:rgba(184,191,209,.26);
  --line-dark-soft:rgba(184,191,209,.14);
  --line-light:rgba(36,28,24,.16);
  --ink-soft:rgba(36,28,24,.66);
  --shell-w:1200px;
  --gutter:clamp(18px,4vw,56px);
  --font-display:"Helvetica Neue",Arial,-apple-system,"PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  --font-body:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  --font-mono:ui-monospace,SFMono-Regular,Menlo,Consolas,"Liberation Mono",monospace;
}

/* ---------- 基础排版 ---------- */
body{
  font-family:var(--font-body);
  font-size:16px;
  line-height:1.75;
  color:var(--text);
  background:var(--paper);
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
h1,h2,h3,h4{font-family:var(--font-display);font-weight:800;line-height:1.2;letter-spacing:-.02em}
p{text-wrap:pretty}
::selection{background:var(--lime);color:var(--ink-deep)}
:focus-visible{outline:2px solid var(--action);outline-offset:3px}
.site-header :focus-visible,
.site-footer :focus-visible{outline-color:var(--lime)}
.visually-hidden{position:absolute!important;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0}

/* ---------- 容器 ---------- */
.shell{width:100%;max-width:var(--shell-w);margin-inline:auto;padding-inline:var(--gutter)}
.page-main{display:block;background:var(--paper)}
#main-content{display:block}

/* ---------- 按钮 ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:11px 20px;border:1px solid transparent;
  font-family:var(--font-body);font-size:14px;font-weight:600;line-height:1.2;letter-spacing:.02em;
  cursor:pointer;transition:background .18s ease,color .18s ease,border-color .18s ease,transform .18s ease;
}
.btn-primary{background:var(--action);color:var(--ink-deep);border-color:var(--action)}
.btn-primary:hover{background:var(--lime);border-color:var(--lime);color:var(--ink-deep)}
.btn-primary:active{transform:translateY(1px)}
.btn-ghost{background:transparent;color:var(--on-ink);border-color:var(--line-dark)}
.btn-ghost:hover{border-color:var(--mist);color:#fff;background:rgba(245,240,230,.08)}
.btn-quiet{background:transparent;color:var(--text);border-color:var(--line-light)}
.btn-quiet:hover{border-color:var(--action);color:var(--alert);background:rgba(255,107,44,.08)}

/* ---------- 跳转链接 ---------- */
.skip-link{
  position:absolute;left:12px;top:-72px;z-index:90;
  padding:10px 18px;
  background:var(--lime);color:var(--ink-deep);
  font-family:var(--font-mono);font-size:13px;font-weight:700;letter-spacing:.06em;
  transition:top .16s ease;
}
.skip-link:focus{top:12px}

/* ---------- 头部 ---------- */
.site-header{
  position:sticky;top:0;z-index:60;
  background:var(--ink);
  color:var(--on-ink);
  border-bottom:1px solid var(--line-dark);
  transition:box-shadow .24s ease;
}
.site-header.is-scrolled{box-shadow:0 10px 28px rgba(4,7,18,.5)}

.header-top{background:var(--ink-deep);border-bottom:1px solid var(--line-dark)}
.header-top-inner{
  display:grid;
  grid-template-columns:auto minmax(0,1fr) auto;
  align-items:center;
  gap:clamp(16px,3vw,40px);
  min-height:76px;
  padding-block:12px;
  transition:min-height .24s ease;
}
.site-header.is-scrolled .header-top-inner{min-height:64px}

.brand-block{display:flex;align-items:center;gap:12px;min-width:0}
.brand-mark{
  display:inline-flex;align-items:baseline;gap:0;
  padding:7px 9px;
  border:1px solid var(--line-dark);
  background:linear-gradient(180deg,rgba(245,240,230,.06),rgba(245,240,230,0));
  line-height:1;
  transition:border-color .18s ease,background .18s ease;
}
.brand-block:hover .brand-mark{border-color:var(--action);background:rgba(255,107,44,.12)}
.brand-r{font-family:var(--font-display);font-weight:800;font-size:20px;letter-spacing:-.05em;color:var(--on-ink)}
.brand-num{font-family:var(--font-mono);font-size:12px;font-weight:700;color:var(--lime);padding-left:3px}
.brand-text{display:flex;flex-direction:column;gap:2px;min-width:0}
.brand-name{font-family:var(--font-display);font-weight:800;font-size:19px;line-height:1.15;letter-spacing:.01em;color:var(--on-ink)}
.brand-line{font-size:11.5px;line-height:1.3;letter-spacing:.06em;color:var(--on-ink-dim);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}

.header-status{
  display:flex;align-items:center;justify-content:center;flex-wrap:wrap;gap:8px;
  font-family:var(--font-mono);font-size:11.5px;letter-spacing:.08em;
  color:var(--on-ink-dim);
}
.status-dot{
  width:7px;height:7px;flex:none;
  background:var(--lime);
  box-shadow:0 0 0 3px rgba(184,227,75,.16);
}
.status-text{white-space:nowrap}
.status-text:first-of-type{color:var(--on-ink)}
.status-sep{color:rgba(184,191,209,.42)}

.header-actions{display:flex;align-items:center;justify-content:flex-end;gap:10px}

.header-nav-bar{background:var(--ink)}
.nav-inner{
  display:flex;align-items:center;justify-content:space-between;gap:16px;
  min-height:52px;
}
.site-nav{min-width:0}
.nav-list{display:flex;align-items:stretch;gap:2px}
.nav-link{
  position:relative;
  display:inline-flex;align-items:baseline;gap:7px;
  padding:14px 14px;
  font-size:14.5px;line-height:1.3;color:var(--on-ink-dim);
  transition:color .16s ease,background .16s ease;
}
.nav-index{
  font-family:var(--font-mono);font-size:10.5px;letter-spacing:.04em;
  color:rgba(184,191,209,.55);
  transition:color .16s ease;
}
.nav-label{white-space:nowrap}
.nav-link:hover{color:var(--on-ink);background:rgba(46,59,122,.55)}
.nav-link:hover .nav-index{color:var(--lime)}
.nav-link[aria-current="page"]{color:var(--on-ink)}
.nav-link[aria-current="page"] .nav-index{color:var(--action)}
.nav-link[aria-current="page"]::after{
  content:"";position:absolute;left:14px;right:14px;bottom:0;height:2px;
  background:var(--action);
}
.nav-note{
  font-family:var(--font-mono);font-size:11px;letter-spacing:.12em;
  color:rgba(184,191,209,.66);white-space:nowrap;
}

.nav-toggle{
  display:none;align-items:center;gap:10px;
  padding:9px 12px;
  border:1px solid var(--line-dark);
  color:var(--on-ink);
  font-family:var(--font-mono);font-size:12px;letter-spacing:.1em;
  transition:border-color .16s ease,color .16s ease;
}
.nav-toggle:hover{border-color:var(--lime);color:var(--lime)}
.nav-toggle-bars{display:inline-flex;flex-direction:column;justify-content:center;gap:4px;width:16px;flex:none}
.nav-toggle-bars span{display:block;height:1.5px;background:currentColor;transition:transform .2s ease}
.nav-toggle-label{line-height:1}
.site-header[data-open] .nav-toggle-bars span:nth-child(1){transform:translateY(2.75px) rotate(45deg)}
.site-header[data-open] .nav-toggle-bars span:nth-child(2){transform:translateY(-2.75px) rotate(-45deg)}

.scroll-progress{
  position:absolute;left:0;right:0;bottom:0;height:2px;
  background:rgba(184,191,209,.14);overflow:hidden;
}
.scroll-progress-bar{
  display:block;height:100%;width:100%;
  transform:scaleX(0);transform-origin:0 50%;
  background:linear-gradient(90deg,var(--lime),var(--action));
}

/* ---------- 页脚 ---------- */
.site-footer{
  background:var(--ink-deep);
  color:var(--on-ink);
  border-top:1px solid var(--line-dark);
  padding-block:clamp(38px,5.5vw,68px) clamp(20px,3vw,28px);
}
.footer-lede{
  display:grid;gap:12px;
  padding-bottom:clamp(24px,3.4vw,38px);
  border-bottom:1px solid var(--line-dark);
}
.footer-eyebrow{
  font-family:var(--font-mono);font-size:11.5px;letter-spacing:.2em;
  color:var(--lime);text-transform:uppercase;
}
.footer-wordmark{
  font-family:var(--font-display);font-weight:800;
  font-size:clamp(34px,6.6vw,72px);line-height:.94;letter-spacing:-.035em;
  color:var(--on-ink);
}
.footer-wordmark::after{
  content:"";display:inline-block;
  width:.16em;height:.16em;margin-left:.1em;
  background:var(--action);vertical-align:baseline;
}
.footer-note{max-width:46ch;font-size:14px;line-height:1.8;color:var(--on-ink-dim)}
.footer-version{display:flex;flex-wrap:wrap;gap:8px;margin-top:4px}
.version-chip{
  display:inline-flex;align-items:center;
  padding:5px 10px;
  border:1px solid var(--line-dark);
  font-family:var(--font-mono);font-size:11px;letter-spacing:.1em;
  color:var(--on-ink-dim);
}
.version-chip--lime{color:var(--lime);border-color:rgba(184,227,75,.45);background:rgba(184,227,75,.08)}
.version-chip--dim{color:rgba(184,191,209,.72)}

.footer-grid{
  display:grid;
  grid-template-columns:repeat(3,minmax(0,1fr));
  gap:clamp(24px,3.4vw,56px);
  padding-block:clamp(24px,3.4vw,42px);
  border-bottom:1px solid var(--line-dark);
}
.footer-col{min-width:0}
.footer-col-title{
  margin-bottom:14px;padding-bottom:10px;
  border-bottom:1px solid var(--line-dark);
  font-family:var(--font-mono);font-size:11.5px;font-weight:700;
  letter-spacing:.16em;color:var(--on-ink);
}
.footer-links{display:grid;gap:10px}
.footer-link{
  display:inline-block;font-size:14.5px;line-height:1.5;
  color:var(--on-ink-dim);
  transition:color .16s ease,transform .16s ease;
}
.footer-link:hover{color:var(--action);transform:translateX(3px)}
.footer-contact{display:grid;gap:14px}
.contact-row{display:grid;gap:3px}
.contact-label{
  font-family:var(--font-mono);font-size:10.5px;letter-spacing:.16em;
  color:rgba(184,191,209,.6);
}
.contact-value{font-size:14px;line-height:1.65;color:var(--on-ink-dim);word-break:break-word}
.contact-note{
  margin-top:16px;padding-left:12px;
  border-left:2px solid var(--action);
  font-size:12.5px;line-height:1.7;color:rgba(184,191,209,.72);
}

.footer-legal{
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;
  gap:12px 24px;padding-top:clamp(18px,2.6vw,26px);
}
.legal-links{display:flex;flex-wrap:wrap;gap:18px}
.legal-link{font-size:13px;color:var(--on-ink-dim);transition:color .16s ease}
.legal-link:hover{color:var(--lime)}
.footer-meta{
  display:flex;flex-wrap:wrap;gap:8px 18px;
  font-family:var(--font-mono);font-size:11.5px;letter-spacing:.06em;
  color:rgba(184,191,209,.6);
}

.to-top{
  position:fixed;right:clamp(14px,2vw,26px);bottom:clamp(14px,2vw,26px);z-index:50;
  display:inline-flex;align-items:center;gap:8px;
  padding:10px 14px;
  background:var(--layer);color:var(--on-ink);
  border:1px solid var(--line-dark);
  font-family:var(--font-mono);font-size:11px;letter-spacing:.1em;
  opacity:0;visibility:hidden;transform:translateY(8px);
  transition:opacity .2s ease,transform .2s ease,visibility .2s,border-color .16s ease,color .16s ease;
}
.to-top.is-shown{opacity:1;visibility:visible;transform:none}
.to-top:hover{border-color:var(--lime);color:var(--lime)}

/* ---------- 面包屑 ---------- */
.breadcrumbs{background:var(--cream);border-bottom:1px solid var(--line-light);padding-block:14px}
.breadcrumb-list{
  display:flex;flex-wrap:wrap;align-items:center;gap:6px;
  font-family:var(--font-mono);font-size:11.5px;letter-spacing:.06em;
  color:var(--ink-soft);
}
.breadcrumb-item{display:inline-flex;align-items:center;gap:6px}
.breadcrumb-item::after{content:"/";color:rgba(36,28,24,.32)}
.breadcrumb-item:last-child::after{content:""}
.breadcrumb-link{transition:color .16s ease}
.breadcrumb-link:hover{color:var(--alert)}
.breadcrumb-current{color:var(--text)}

/* ---------- 区块与标题 ---------- */
.page-section{padding-block:clamp(40px,6vw,82px)}
.page-section--ink{background:var(--ink);color:var(--on-ink)}
.page-section--cream{background:var(--cream)}
.section-head{
  display:grid;
  grid-template-columns:minmax(0,auto) minmax(0,1fr);
  align-items:start;
  gap:clamp(14px,2.6vw,36px);
  margin-bottom:clamp(22px,3vw,38px);
  padding-top:18px;
  border-top:1px solid var(--line-light);
}
.section-index{
  font-family:var(--font-mono);font-weight:700;
  font-size:clamp(26px,4vw,44px);line-height:1;letter-spacing:-.03em;
  color:rgba(36,28,24,.22);
}
.section-title{font-size:clamp(23px,3.1vw,38px);text-wrap:balance}
.section-note{max-width:58ch;margin-top:8px;font-size:14px;line-height:1.8;color:var(--ink-soft)}
.page-section--ink .section-head{border-top-color:var(--line-dark)}
.page-section--ink .section-index{color:rgba(184,191,209,.42)}
.page-section--ink .section-title{color:var(--on-ink)}
.page-section--ink .section-note{color:var(--on-ink-dim)}
.prose{max-width:68ch;font-size:16.5px;line-height:1.9}
.prose p + p{margin-top:1em}
.prose h3{margin-top:1.6em;margin-bottom:.5em;font-size:19px}
.page-section--ink .prose{color:rgba(245,240,230,.86)}

/* ---------- 网格与展签卡 ---------- */
.grid{display:grid;gap:clamp(16px,2vw,28px)}
.grid-2{grid-template-columns:repeat(2,minmax(0,1fr))}
.grid-3{grid-template-columns:repeat(3,minmax(0,1fr))}

.exhibit-card{
  position:relative;
  padding:clamp(18px,2.4vw,26px);
  background:var(--paper);
  border:1px solid var(--line-light);
  transition:transform .2s ease,border-color .2s ease,background .2s ease;
}
.exhibit-card::before{
  content:"";position:absolute;left:-1px;top:-1px;
  width:14px;height:14px;
  border-left:2px solid var(--action);border-top:2px solid var(--action);
  opacity:0;transition:opacity .2s ease;
}
.exhibit-card:hover{transform:translateY(-3px);border-color:rgba(255,107,44,.5)}
.exhibit-card:hover::before{opacity:1}
.exhibit-card--cream{background:var(--cream)}
.exhibit-card--ink{background:var(--layer);border-color:var(--line-dark);color:var(--on-ink)}
.exhibit-card--ink .exhibit-text{color:var(--on-ink-dim)}
.exhibit-card-head{
  display:flex;align-items:center;justify-content:space-between;
  gap:12px;margin-bottom:14px;
}
.exhibit-tag{
  font-family:var(--font-mono);font-size:10.5px;letter-spacing:.14em;
  color:var(--ink-soft);
}
.exhibit-card--ink .exhibit-tag{color:rgba(184,191,209,.7)}
.exhibit-title{font-size:19px;line-height:1.35;margin-bottom:8px;text-wrap:balance}
.exhibit-text{font-size:14.5px;line-height:1.8;color:rgba(36,28,24,.72)}

.tag{
  display:inline-flex;align-items:center;gap:6px;
  padding:4px 9px;
  border:1px solid currentColor;
  font-family:var(--font-mono);font-size:10.5px;letter-spacing:.1em;
  color:var(--ink-soft);
}
.tag--lime{color:var(--lime-ink);border-color:rgba(184,227,75,.9);background:rgba(184,227,75,.22)}
.tag--orange{color:#A83A18;border-color:rgba(255,107,44,.5);background:rgba(255,107,44,.12)}
.tag--ink{color:var(--on-ink);border-color:var(--line-dark);background:rgba(245,240,230,.06)}

/* ---------- 图像容器基础 ---------- */
.media-frame{
  position:relative;display:block;width:100%;overflow:hidden;
  aspect-ratio:16/10;
  border:1px solid var(--line-light);
  background:linear-gradient(160deg,rgba(27,36,80,.94),rgba(16,22,47,.99));
}
.media-frame::before{
  content:"";position:absolute;inset:0;z-index:0;
  background-image:
    linear-gradient(rgba(184,191,209,.14) 1px,transparent 1px),
    linear-gradient(90deg,rgba(184,191,209,.14) 1px,transparent 1px);
  background-size:28px 28px;opacity:.5;
}
.media-frame::after{
  content:"";position:absolute;inset:0;z-index:0;
  background:
    radial-gradient(circle at 76% 22%,rgba(255,107,44,.3),transparent 46%),
    radial-gradient(circle at 18% 84%,rgba(184,227,75,.2),transparent 48%);
}
.media-frame > *{position:relative;z-index:1}
.media-frame img{position:absolute;inset:0;z-index:2;width:100%;height:100%;object-fit:cover}
.media-frame--wide{aspect-ratio:21/9}
.media-frame--square{aspect-ratio:1/1}
.media-frame--tall{aspect-ratio:4/5}
.media-caption{
  margin-top:8px;
  font-family:var(--font-mono);font-size:11px;letter-spacing:.08em;
  color:var(--ink-soft);
}
.page-section--ink .media-caption{color:rgba(184,191,209,.7)}

/* ---------- 版本时间轴 ---------- */
.version-rail{position:relative;padding-left:22px;border-left:1px solid var(--line-light)}
.version-rail::before{
  content:"";position:absolute;left:-1px;top:0;width:1px;height:38px;
  background:var(--action);
}
.rail-title{
  margin-bottom:16px;
  font-family:var(--font-mono);font-size:11px;letter-spacing:.16em;
  color:var(--ink-soft);
}
.rail-list{display:grid;gap:16px}
.rail-item{
  position:relative;padding-left:2px;
  font-family:var(--font-mono);font-size:11.5px;line-height:1.6;letter-spacing:.05em;
  color:rgba(36,28,24,.62);
}
.rail-item::before{
  content:"";position:absolute;left:-26px;top:.5em;
  width:8px;height:8px;
  background:var(--paper);
  border:1px solid var(--mist);
}
.rail-item--current{color:var(--text)}
.rail-item--current::before{background:var(--action);border-color:var(--action)}
.page-section--ink .version-rail{border-left-color:var(--line-dark)}
.page-section--ink .rail-title{color:rgba(184,191,209,.72)}
.page-section--ink .rail-item{color:rgba(184,191,209,.72)}
.page-section--ink .rail-item--current{color:var(--on-ink)}
.page-section--ink .rail-item::before{background:var(--layer);border-color:var(--mist)}

/* ---------- 渐入动效 ---------- */
.reveal-enabled [data-reveal]{
  opacity:0;transform:translateY(16px);
  transition:opacity .5s ease,transform .5s ease;
}
.reveal-enabled [data-reveal].is-visible{opacity:1;transform:none}

/* ---------- 平板 ---------- */
@media (max-width:1100px){
  .header-status{display:none}
  .header-top-inner{grid-template-columns:minmax(0,1fr) auto}
  .nav-link{padding:13px 11px;font-size:13.5px}
}

@media (max-width:1024px){
  .grid-3{grid-template-columns:repeat(2,minmax(0,1fr))}
  .footer-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
  .footer-col--contact{grid-column:1/-1}
}

/* ---------- 移动导航 ---------- */
@media (max-width:960px){
  .nav-toggle{display:inline-flex}
  .nav-note{display:none}
  .nav-inner{flex-wrap:wrap;min-height:56px;padding-block:9px}
  .site-nav{
    display:none;width:100%;order:3;
    margin-top:9px;padding-top:6px;
    border-top:1px solid var(--line-dark);
  }
  .site-header[data-open] .site-nav{display:block}
  .nav-list{flex-direction:column;flex-wrap:nowrap;gap:0;padding-bottom:10px}
  .nav-link{
    display:flex;align-items:center;gap:10px;width:100%;
    padding:14px 4px;font-size:15px;
    border-bottom:1px solid var(--line-dark-soft);
  }
  .nav-link:last-child{border-bottom:0}
  .nav-link:hover{background:rgba(46,59,122,.45)}
  .nav-link[aria-current="page"]::after{
    left:0;right:auto;top:50%;bottom:auto;
    width:2px;height:20px;transform:translateY(-50%);
  }
  .brand-line{max-width:44vw}
}

/* ---------- 手机 ---------- */
@media (max-width:720px){
  .grid-2,.grid-3{grid-template-columns:minmax(0,1fr)}
  .section-head{grid-template-columns:minmax(0,1fr);gap:10px}
  .section-index{font-size:26px}
  .footer-grid{grid-template-columns:minmax(0,1fr);gap:26px}
  .footer-legal{flex-direction:column;align-items:flex-start}
}

@media (max-width:600px){
  .brand-line{display:none}
  .brand-name{font-size:17px}
  .brand-mark{padding:6px 7px}
  .header-actions .btn{padding:9px 12px;font-size:12.5px}
  .header-top-inner{min-height:64px;gap:12px}
  .footer-wordmark{font-size:34px}
}

/* ---------- 减少动态 ---------- */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{animation-duration:.001ms!important;animation-iteration-count:1!important;transition-duration:.001ms!important}
  .reveal-enabled [data-reveal]{opacity:1;transform:none}
  .exhibit-card:hover{transform:none}
  .footer-link:hover{transform:none}
}