/* ============================================================
   9393网页版 · 共享样式 /assets/site.css
   目录型内容地图 · 双层导航 · 锐利网格
   ============================================================ */

/* ---------- 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,blockquote,dl,dd{margin:0}
ul,ol{padding:0;list-style:none}
img,svg{max-width:100%;display:block}
button{font:inherit;color:inherit}
a{color:inherit}
main{display:block}

/* ---------- 2. Tokens ---------- */
:root{
  --ink-900:#0B1B2B;
  --ink-800:#12293F;
  --ink-700:#3B4A58;
  --paper:#F4F1E8;
  --paper-ink:#1A2733;
  --haze:#D8DEE2;
  --muted:#7F8B94;
  --cyan:#38F2D0;
  --amber:#F5A524;
  --cobalt:#2D6CDF;
  --sage:#8FAF9B;

  --line:rgba(216,222,226,.14);
  --line-strong:rgba(216,222,226,.30);
  --line-cyan:rgba(56,242,208,.45);
  --text:rgba(244,241,232,.92);
  --text-soft:rgba(244,241,232,.72);
  --text-dim:rgba(244,241,232,.50);

  --font-display:"Noto Sans SC","Source Han Sans SC","PingFang SC","Microsoft YaHei",sans-serif;
  --font-body:"Noto Sans SC","Source Han Sans SC","PingFang SC","Microsoft YaHei",sans-serif;
  --font-mono:"JetBrains Mono","IBM Plex Mono",SFMono-Regular,Consolas,"Courier New",monospace;

  --shell:1200px;
  --gutter:clamp(1rem,4vw,2.5rem);
  --gap:clamp(1rem,2.4vw,1.75rem);
  --ease:cubic-bezier(.2,.7,.3,1);
  --grid-cell:64px;
}

/* ---------- 3. Base & 中文排版 ---------- */
body{
  background-color:var(--ink-900);
  background-image:
    linear-gradient(to right, rgba(216,222,226,.045) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(216,222,226,.045) 1px, transparent 1px);
  background-size:var(--grid-cell) var(--grid-cell);
  color:var(--text);
  font-family:var(--font-body);
  font-size:1rem;
  font-weight:400;
  line-height:1.75;
  letter-spacing:.01em;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
  min-height:100vh;
}
h1,h2,h3,h4{font-family:var(--font-display);font-weight:800;line-height:1.2;letter-spacing:-.02em;color:var(--paper)}
h1{font-size:clamp(2.4rem,6vw,4.6rem)}
h2{font-size:clamp(1.5rem,2.4vw,2.2rem)}
h3{font-size:clamp(1.1rem,1.4vw,1.35rem);letter-spacing:-.01em}
p{max-width:62ch}
strong{font-weight:700;color:var(--paper)}
::selection{background:var(--cyan);color:var(--ink-900)}

/* ---------- 4. 通用工具 ---------- */
.shell{width:min(var(--shell),100% - var(--gutter) * 2);margin-inline:auto}
.mono{font-family:var(--font-mono);font-size:.8125rem;letter-spacing:.04em}
.muted{color:var(--text-soft)}
.rule{height:1px;border:0;background:var(--line-strong);margin-block:clamp(1.5rem,3vw,2.5rem)}
.section{padding-block:clamp(2.5rem,6vw,5rem)}
.section__head{display:grid;gap:.5rem;margin-bottom:clamp(1.25rem,2.5vw,2rem);border-left:2px solid var(--cyan);padding-left:1rem}
.eyebrow{font-family:var(--font-mono);font-size:.75rem;letter-spacing:.16em;text-transform:uppercase;color:var(--cyan)}
.surface-paper{background:var(--paper);color:var(--paper-ink)}
.surface-paper h1,.surface-paper h2,.surface-paper h3,.surface-paper h4,.surface-paper strong{color:var(--paper-ink)}
.surface-paper .muted{color:#4C5A67}

.prose{max-width:68ch;display:grid;gap:1.15rem;font-size:1rem;line-height:1.8}
.prose h2{margin-top:1rem;padding-bottom:.5rem;border-bottom:1px solid var(--line-strong)}
.prose ul,.prose ol{display:grid;gap:.5rem;padding-left:1.1rem}
.prose ul li{list-style:none;position:relative}
.prose ul li::before{content:"—";position:absolute;left:-1.1rem;color:var(--cyan)}
.prose a{color:var(--cyan);text-decoration:none;border-bottom:1px solid var(--line-cyan)}

/* ---------- 5. 焦点与链接 ---------- */
:focus-visible{outline:2px solid var(--cyan);outline-offset:3px}
.skip-link{
  position:absolute;left:1rem;top:-4rem;z-index:200;
  background:var(--cyan);color:var(--ink-900);
  padding:.65rem 1.1rem;font-family:var(--font-mono);font-size:.8125rem;font-weight:700;
  text-decoration:none;border:1px solid var(--ink-900);
  transition:top .18s var(--ease);
}
.skip-link:focus{top:.75rem}

/* ---------- 6. 按钮 ---------- */
.btn{
  display:inline-flex;align-items:center;gap:.5rem;
  padding:.8rem 1.35rem;
  font-family:var(--font-mono);font-size:.8125rem;letter-spacing:.08em;
  text-decoration:none;border:1px solid var(--line-strong);
  background:transparent;color:var(--paper);
  border-radius:0;cursor:pointer;
  transition:background-color .16s var(--ease),color .16s var(--ease),border-color .16s var(--ease),transform .16s var(--ease);
}
.btn:hover{transform:translateY(-1px)}
.btn--primary{background:var(--cyan);color:var(--ink-900);border-color:var(--cyan);font-weight:700}
.btn--primary:hover{background:#63f7dd;border-color:#63f7dd}
.btn--ghost{border-color:var(--line-strong);color:var(--paper)}
.btn--ghost:hover{border-color:var(--cyan);color:var(--cyan);background:rgba(56,242,208,.08)}
.btn--quiet{border-color:transparent;padding-inline:.25rem;color:var(--text-soft)}
.btn--quiet:hover{color:var(--cyan)}

/* ---------- 7. 标签 ---------- */
.tag{
  display:inline-flex;align-items:center;gap:.35rem;
  font-family:var(--font-mono);font-size:.6875rem;letter-spacing:.1em;text-transform:uppercase;
  padding:.25rem .5rem;border:1px solid var(--line-strong);color:var(--text-soft);
  background:rgba(244,241,232,.04);
}
.tag--cyan{color:var(--cyan);border-color:var(--line-cyan);background:rgba(56,242,208,.10)}
.tag--amber{color:var(--amber);border-color:rgba(245,165,36,.45);background:rgba(245,165,36,.12)}
.tag--sage{color:#BFD6C9;border-color:rgba(143,175,155,.5);background:rgba(143,175,155,.14)}
.tag--muted{color:var(--muted);border-color:var(--line)}

/* ---------- 8. 面包屑 ---------- */
.breadcrumb{padding-block:.85rem;border-bottom:1px solid var(--line)}
.breadcrumb__list{display:flex;flex-wrap:wrap;align-items:center;gap:.4rem;font-family:var(--font-mono);font-size:.75rem;letter-spacing:.06em;color:var(--text-dim)}
.breadcrumb__item{display:inline-flex;align-items:center;gap:.4rem}
.breadcrumb__item + .breadcrumb__item::before{content:"/";color:var(--ink-700)}
.breadcrumb__link{color:var(--text-soft);text-decoration:none;border-bottom:1px solid transparent}
.breadcrumb__link:hover{color:var(--cyan);border-bottom-color:var(--line-cyan)}
.breadcrumb__current{color:var(--cyan)}

/* ---------- 9. 卡片 ---------- */
.card-grid{display:grid;gap:var(--gap);grid-template-columns:repeat(auto-fit,minmax(240px,1fr))}
.index-card{
  position:relative;display:grid;gap:.6rem;
  padding:clamp(1rem,2vw,1.5rem);
  background:var(--ink-800);
  border:1px solid var(--line);
  color:inherit;text-decoration:none;
  transition:border-color .18s var(--ease),background-color .18s var(--ease),transform .18s var(--ease);
}
.index-card::after{
  content:"";position:absolute;left:-1px;bottom:-1px;right:-1px;height:2px;
  background:var(--cyan);transform:scaleX(0);transform-origin:left;
  transition:transform .22s var(--ease);
}
.index-card:hover,.index-card:focus-visible{border-color:var(--line-cyan);transform:translateY(-2px)}
.index-card:hover::after,.index-card:focus-visible::after{transform:scaleX(1)}
.index-card__num{font-family:var(--font-mono);font-size:clamp(1.75rem,4vw,2.6rem);line-height:1;color:var(--ink-700);letter-spacing:-.02em}
.index-card:hover .index-card__num{color:var(--cyan)}
.index-card__title{font-family:var(--font-display);font-size:1.1rem;font-weight:700;color:var(--paper);letter-spacing:-.01em}
.index-card__desc{font-size:.9rem;color:var(--text-soft);line-height:1.7}
.index-card__meta{display:flex;flex-wrap:wrap;gap:.4rem;margin-top:.25rem}

/* ---------- 10. 图像容器（页面阶段放置占位） ---------- */
.media-frame{
  position:relative;display:block;overflow:hidden;
  background:
    linear-gradient(to right, rgba(216,222,226,.10) 1px, transparent 1px) 0 0/32px 32px,
    linear-gradient(to bottom, rgba(216,222,226,.10) 1px, transparent 1px) 0 0/32px 32px,
    var(--ink-800);
  border:1px solid var(--line-strong);
  aspect-ratio:16/9;
}
.media-frame--wide{aspect-ratio:21/9}
.media-frame--square{aspect-ratio:1/1}
.media-frame--tall{aspect-ratio:3/4}
.media-frame > img,.media-frame > svg{width:100%;height:100%;object-fit:cover;display:block}
.media-frame__fallback{
  position:absolute;inset:0;display:grid;place-items:center;
  font-family:var(--font-mono);font-size:.75rem;letter-spacing:.16em;
  color:rgba(244,241,232,.35);text-transform:uppercase;
}
.media-frame__caption{
  margin-top:.6rem;font-family:var(--font-mono);font-size:.6875rem;
  letter-spacing:.08em;color:var(--muted);
}

/* ---------- 11. 页头 ---------- */
.site-header{
  position:sticky;top:0;z-index:80;
  background:var(--ink-900);
  border-bottom:1px solid var(--line-strong);
}
.header-top{background:var(--ink-900);border-bottom:1px solid var(--line)}
.header-top__inner{
  display:flex;align-items:center;justify-content:space-between;
  gap:1rem;flex-wrap:wrap;padding-block:.55rem;
}
.brand{display:inline-flex;align-items:center;gap:.7rem;text-decoration:none;color:var(--paper)}
.brand__mark{
  display:grid;place-items:center;
  width:38px;height:38px;flex:none;
  font-family:var(--font-mono);font-size:.95rem;font-weight:700;letter-spacing:.02em;
  color:var(--ink-900);background:var(--cyan);
  border:1px solid var(--cyan);
  transition:background-color .16s var(--ease),color .16s var(--ease);
}
.brand:hover .brand__mark{background:transparent;color:var(--cyan)}
.brand__text{display:grid;gap:.1rem}
.brand__name{font-family:var(--font-display);font-weight:800;font-size:1.0625rem;letter-spacing:-.01em;line-height:1.2}
.brand__tagline{font-family:var(--font-mono);font-size:.6875rem;letter-spacing:.14em;color:var(--muted);line-height:1.3}
.utility-nav{display:flex;align-items:center;gap:.4rem;flex-wrap:wrap}
.utility-link{
  display:inline-flex;align-items:center;gap:.45rem;
  padding:.35rem .7rem;
  font-family:var(--font-mono);font-size:.75rem;letter-spacing:.06em;
  color:var(--text-soft);text-decoration:none;
  border:1px solid var(--line);
  transition:color .16s var(--ease),border-color .16s var(--ease),background-color .16s var(--ease);
}
.utility-link:hover{color:var(--paper);border-color:var(--line-strong);background:rgba(244,241,232,.05)}
.utility-dot{width:6px;height:6px;flex:none;background:var(--cyan);display:inline-block}
.utility-dot--amber{background:var(--amber)}

.header-main{background:var(--ink-800);position:relative}
.header-main__inner{display:flex;align-items:center;justify-content:space-between;gap:1rem}
.header-index{
  display:inline-flex;align-items:center;gap:.5rem;flex:none;
  font-family:var(--font-mono);font-size:.6875rem;letter-spacing:.14em;
  color:var(--muted);text-transform:uppercase;padding-block:.95rem;
}
.header-index::before{content:"";width:14px;height:1px;background:var(--cyan)}

.primary-nav{display:flex;align-items:stretch}
.nav-list{display:flex;align-items:stretch}
.nav-list > li{border-left:1px solid var(--line)}
.nav-list > li:last-child{border-right:1px solid var(--line)}
.nav-link{
  position:relative;display:flex;align-items:center;gap:.5rem;
  padding:.95rem 1.1rem;text-decoration:none;color:var(--text-soft);
  transition:color .16s var(--ease),background-color .16s var(--ease);
}
.nav-link::after{
  content:"";position:absolute;left:0;right:0;bottom:-1px;height:2px;
  background:var(--cyan);transform:scaleX(0);transform-origin:left;
  transition:transform .2s var(--ease);
}
.nav-link:hover{color:var(--paper);background:rgba(56,242,208,.07)}
.nav-link:hover::after{transform:scaleX(1)}
.nav-link__num{font-family:var(--font-mono);font-size:.6875rem;letter-spacing:.08em;color:var(--ink-700);transition:color .16s var(--ease)}
.nav-link__label{font-size:.9375rem;font-weight:500;white-space:nowrap}
.nav-link:hover .nav-link__num{color:var(--cyan)}
.nav-link[aria-current="page"]{color:var(--paper);background:rgba(56,242,208,.12)}
.nav-link[aria-current="page"]::after{transform:scaleX(1)}
.nav-link[aria-current="page"] .nav-link__num{color:var(--cyan)}
.nav-link[aria-current="page"] .nav-link__label{font-weight:700}
.nav-link--update .nav-link__label{color:var(--amber)}
.nav-link--update .nav-link__num{color:rgba(245,165,36,.55)}
.nav-link--update:hover .nav-link__label{color:var(--amber)}

.nav-toggle{
  display:none;align-items:center;gap:.55rem;
  padding:.55rem .8rem;background:transparent;
  border:1px solid var(--line-strong);color:var(--paper);
  cursor:pointer;font-family:var(--font-mono);font-size:.75rem;letter-spacing:.1em;
  transition:border-color .16s var(--ease),color .16s var(--ease);
}
.nav-toggle:hover{border-color:var(--cyan);color:var(--cyan)}
.nav-toggle__bars{display:grid;gap:4px}
.nav-toggle__bars i{display:block;width:16px;height:1.5px;background:currentColor}
.nav-toggle[aria-expanded="true"]{border-color:var(--cyan);color:var(--cyan);background:rgba(56,242,208,.10)}
.nav-toggle__label{line-height:1}

.scroll-progress{position:absolute;left:0;right:0;bottom:-1px;height:2px;background:transparent;pointer-events:none}
.scroll-progress__bar{
  display:block;height:100%;width:100%;
  background:linear-gradient(90deg,var(--cyan),var(--amber));
  transform:scaleX(0);transform-origin:left center;
  transition:transform .1s linear;
}

/* ---------- 12. 页脚 ---------- */
.site-footer{
  margin-top:clamp(2.5rem,6vw,5rem);
  background:var(--ink-900);
  border-top:1px solid var(--line-strong);
  background-image:
    linear-gradient(to right, rgba(216,222,226,.05) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(216,222,226,.05) 1px, transparent 1px);
  background-size:48px 48px;
  padding-block:clamp(2rem,4vw,3.25rem) 1.25rem;
}
.footer-grid{
  display:grid;gap:clamp(1.5rem,3vw,2.5rem);
  grid-template-columns:1.2fr .9fr 1fr 1.4fr;
  padding-bottom:clamp(1.5rem,3vw,2.5rem);
  border-bottom:1px solid var(--line);
}
.footer-brand{display:grid;gap:.6rem;align-content:start}
.footer-mark{
  display:grid;place-items:center;width:56px;height:56px;
  font-family:var(--font-mono);font-size:1.25rem;font-weight:700;color:var(--cyan);
  border:1px solid var(--line-cyan);background:rgba(56,242,208,.06);
}
.footer-name{font-family:var(--font-display);font-weight:800;font-size:1.0625rem;color:var(--paper);letter-spacing:-.01em}
.footer-note{font-family:var(--font-mono);font-size:.6875rem;letter-spacing:.12em;color:var(--muted);line-height:1.6}
.footer-col{display:grid;gap:.75rem;align-content:start}
.footer-col__title{
  display:flex;align-items:center;gap:.5rem;
  font-family:var(--font-mono);font-size:.6875rem;font-weight:500;
  letter-spacing:.16em;text-transform:uppercase;color:var(--muted);
}
.footer-col__title::before{content:"";width:16px;height:1px;background:var(--cyan);flex:none}
.footer-links{display:grid;gap:.45rem}
.footer-link{
  display:inline-block;font-size:.875rem;color:var(--text-soft);text-decoration:none;
  border-bottom:1px solid transparent;
  transition:color .16s var(--ease),border-color .16s var(--ease);
}
.footer-link:hover{color:var(--cyan);border-bottom-color:var(--line-cyan)}
.contact-line{
  display:grid;grid-template-columns:3.5rem 1fr;gap:.5rem;align-items:start;
  font-size:.875rem;color:var(--text-soft);max-width:none;
}
.contact-line__label{font-family:var(--font-mono);font-size:.6875rem;letter-spacing:.1em;color:var(--muted);padding-top:.15rem}
.contact-line__value{word-break:break-word}
.footer-base{
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;
  gap:.5rem 1.5rem;padding-top:1.15rem;
}
.footer-copy{font-family:var(--font-mono);font-size:.6875rem;letter-spacing:.06em;color:var(--text-dim);max-width:none}
.footer-copy--dim{color:var(--muted)}

/* ---------- 13. 动效与显现 ---------- */
[data-reveal]{
  opacity:0;transform:translateY(12px);
  transition:opacity .45s var(--ease),transform .45s var(--ease);
}
[data-reveal].is-revealed{opacity:1;transform:none}

/* ---------- 14. 响应式 ---------- */
@media (max-width:1024px){
  .footer-grid{grid-template-columns:1fr 1fr}
  .nav-link{padding:.9rem .85rem}
  .nav-link__label{font-size:.875rem}
}
@media (max-width:900px){
  .header-index{display:none}
  .nav-toggle{display:inline-flex;margin-block:.5rem}
  .primary-nav{
    position:absolute;left:0;right:0;top:100%;display:none;
    background:var(--ink-800);
    border-top:1px solid var(--line-strong);
    border-bottom:1px solid var(--line-strong);
    box-shadow:0 22px 40px rgba(0,0,0,.55);
    max-height:calc(100vh - 120px);overflow-y:auto;
  }
  .primary-nav[data-open]{display:block}
  .nav-list{flex-direction:column;align-items:stretch}
  .nav-list > li{border-left:0;border-right:0}
  .nav-list > li + li{border-top:1px solid var(--line)}
  .nav-list > li:last-child{border-right:0}
  .nav-link{padding:.95rem var(--gutter);justify-content:flex-start;gap:.75rem}
  .nav-link__label{font-size:.9375rem}
  .header-main__inner{justify-content:flex-end}
}
@media (max-width:640px){
  .header-top__inner{padding-block:.5rem;gap:.5rem}
  .brand__tagline{display:none}
  .brand__mark{width:34px;height:34px;font-size:.875rem}
  .utility-link{font-size:.6875rem;padding:.3rem .55rem}
  .footer-grid{grid-template-columns:1fr}
  .footer-base{flex-direction:column;align-items:flex-start}
  .contact-line{grid-template-columns:3.25rem 1fr}
}
@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}
  .scroll-progress__bar{transition:none}
}

/* ---------- 15. 打印 ---------- */
@media print{
  .site-header,.site-footer,.skip-link,.nav-toggle,.scroll-progress{display:none!important}
  body{background:#fff;color:#000;background-image:none}
  h1,h2,h3,h4,strong{color:#000}
  .index-card{border-color:#999;background:#fff;color:#000}
}