/* ============================================================
   site.css — 共享外壳与基础组件
   /assets/site.css
   ============================================================ */

/* ---------- 1. tokens ---------- */
:root{
  --ink:#0E2A24;
  --ink-2:#173F35;
  --gold:#C8A24A;
  --gold-light:#E8D6A4;
  --paper:#F7F2E6;
  --paper-2:#E9DFC8;
  --cinnabar:#B23A2F;
  --graphite:#23272B;
  --sage:#6F8B80;

  --hairline:rgba(14,42,36,.20);
  --hairline-soft:rgba(14,42,36,.12);
  --hairline-light:rgba(247,242,230,.18);

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

  --shell:1280px;
  --gutter:clamp(16px,4vw,48px);
  --header-h:76px;
  --ease:cubic-bezier(.2,.7,.3,1);
}

@media (max-width:900px){
  :root{ --header-h:64px; }
}

/* ---------- 2. reset ---------- */
*,
*::before,
*::after{ box-sizing:border-box; }

html{
  -webkit-text-size-adjust:100%;
  scroll-behavior:smooth;
  scroll-padding-top:calc(var(--header-h) + 14px);
}

body{
  margin:0;
  font-family:var(--font-body);
  font-size:clamp(16px,1.05vw,17.5px);
  line-height:1.55;
  color:var(--graphite);
  background-color:var(--paper);
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}

body,
h1,h2,h3,h4,p,ul,ol,figure,blockquote{ margin:0; }

ul,ol{ padding:0; list-style:none; }

img,svg{ display:block; max-width:100%; }

a{ color:inherit; }

button{ font:inherit; color:inherit; }

h1,h2,h3,h4{
  font-family:var(--font-display);
  font-weight:900;
  line-height:1.12;
  letter-spacing:-.01em;
  color:var(--ink);
}

strong,b{ font-weight:700; }

#main-content{ display:block; }

html.nav-open,
html.nav-open body{ overflow:hidden; }

/* ---------- 3. focus & motion ---------- */
:focus-visible{
  outline:2px solid var(--gold);
  outline-offset:3px;
}

.site-footer :focus-visible,
.site-header[data-compact] :focus-visible,
.site-header[data-nav-open="true"] :focus-visible{
  outline-color:var(--gold-light);
}

@media (prefers-reduced-motion: reduce){
  html{ scroll-behavior:auto; }
  *,
  *::before,
  *::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
  }
}

/* ============================================================
   4. HEADER — 品牌票根 + 紧凑命令栏
   ============================================================ */
.skip-link{
  position:absolute;
  top:-120px;
  left:14px;
  z-index:200;
  padding:10px 18px;
  background:var(--ink);
  color:var(--paper);
  border:1px solid var(--gold);
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.1em;
  text-decoration:none;
  transition:top .16s var(--ease);
}
.skip-link:focus{ top:14px; }

.site-header{
  --hd-bg:var(--paper);
  --hd-fg:var(--ink);
  --hd-dim:var(--sage);
  --hd-line:rgba(14,42,36,.34);

  position:sticky;
  top:0;
  z-index:80;
  background:var(--hd-bg);
  color:var(--hd-fg);
  border-bottom:1px solid var(--hd-line);
  transition:background-color .2s var(--ease),
             color .2s var(--ease),
             border-color .2s var(--ease);
}

.site-header[data-compact],
.site-header[data-nav-open="true"]{
  --hd-bg:var(--ink);
  --hd-fg:var(--paper);
  --hd-dim:var(--gold-light);
  --hd-line:rgba(200,162,74,.55);
}

.header-inner{
  width:100%;
  max-width:var(--shell);
  margin-inline:auto;
  padding-inline:var(--gutter);
  min-height:var(--header-h);
  display:grid;
  grid-template-columns:minmax(180px,250px) 1fr auto;
  align-items:center;
  gap:clamp(10px,2vw,28px);
}

/* --- brand --- */
.brand{
  grid-column:1;
  grid-row:1;
  display:grid;
  grid-template-columns:auto 1fr;
  grid-template-rows:auto auto;
  column-gap:11px;
  align-items:center;
  padding-block:8px;
  color:inherit;
  text-decoration:none;
}

.brand-tag{
  grid-row:1 / span 2;
  align-self:stretch;
  display:grid;
  place-items:center;
  width:24px;
  min-height:38px;
  writing-mode:vertical-rl;
  background:var(--gold);
  color:var(--ink);
  font-family:var(--font-mono);
  font-size:10px;
  letter-spacing:.14em;
  transition:background-color .16s var(--ease), color .16s var(--ease);
}

.brand:hover .brand-tag{
  background:var(--cinnabar);
  color:var(--paper);
}

.brand-domain{
  font-family:var(--font-mono);
  font-size:clamp(1rem,3.4vw,1.14rem);
  font-weight:600;
  line-height:1.1;
  letter-spacing:-.01em;
}

.brand-sub{
  font-family:var(--font-mono);
  font-size:10.5px;
  line-height:1.3;
  letter-spacing:.12em;
  color:var(--hd-dim);
  white-space:nowrap;
}

/* --- mobile toggle --- */
.nav-toggle{
  display:none;
  grid-column:3;
  grid-row:1;
  justify-self:end;
  align-items:center;
  gap:9px;
  padding:9px 13px;
  background:transparent;
  border:1px solid currentColor;
  color:inherit;
  cursor:pointer;
  transition:background-color .16s var(--ease), color .16s var(--ease);
}
.nav-toggle:hover{ background:rgba(200,162,74,.18); }
.nav-toggle-label{
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.16em;
  line-height:1;
}
.nav-toggle-bars{
  position:relative;
  display:block;
  width:16px;
  height:8px;
}
.nav-toggle-bars::before,
.nav-toggle-bars::after{
  content:"";
  position:absolute;
  left:0;
  right:0;
  height:1.5px;
  background:currentColor;
  transition:transform .18s var(--ease);
}
.nav-toggle-bars::before{ top:0; }
.nav-toggle-bars::after{ bottom:0; }
.nav-toggle[aria-expanded="true"] .nav-toggle-bars::before{
  transform:translateY(3.25px) rotate(45deg);
}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars::after{
  transform:translateY(-3.25px) rotate(-45deg);
}

/* --- command bar --- */
.site-nav{
  grid-column:2;
  grid-row:1;
  display:flex;
  align-items:center;
  justify-content:flex-end;
  gap:clamp(2px,.8vw,10px);
}

.nav-list{
  display:flex;
  align-items:center;
  gap:1px;
  flex-wrap:nowrap;
  margin:0;
  padding:0;
}

.nav-item{ display:block; }

.nav-link{
  display:inline-flex;
  align-items:baseline;
  gap:5px;
  padding:8px 10px 7px;
  border-bottom:2px solid transparent;
  font-size:14px;
  line-height:1;
  letter-spacing:.02em;
  color:var(--hd-dim);
  text-decoration:none;
  white-space:nowrap;
  transition:color .15s var(--ease),
             border-color .15s var(--ease),
             background-color .15s var(--ease);
}
.nav-link:hover{
  color:var(--hd-fg);
  border-bottom-color:var(--gold);
  background:rgba(200,162,74,.10);
}
.nav-link[aria-current="page"]{
  color:var(--hd-fg);
  font-weight:700;
  border-bottom-color:var(--gold);
}

.nav-index{
  font-family:var(--font-mono);
  font-size:9.5px;
  letter-spacing:.04em;
  color:var(--gold);
}
.nav-link[aria-current="page"] .nav-index{ color:var(--cinnabar); }

.nav-tail{
  display:flex;
  align-items:center;
}

.nav-cta{
  display:inline-flex;
  align-items:center;
  margin-left:clamp(4px,.8vw,12px);
  padding:9px 16px;
  background:var(--ink);
  color:var(--paper);
  border:1px solid var(--ink);
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.1em;
  line-height:1;
  text-decoration:none;
  white-space:nowrap;
  transition:background-color .15s var(--ease),
             color .15s var(--ease),
             border-color .15s var(--ease);
}
.nav-cta:hover{
  background:var(--gold);
  color:var(--ink);
  border-color:var(--gold);
}
.site-header[data-compact] .nav-cta,
.site-header[data-nav-open="true"] .nav-cta{
  background:var(--gold);
  color:var(--ink);
  border-color:var(--gold);
}
.site-header[data-compact] .nav-cta:hover,
.site-header[data-nav-open="true"] .nav-cta:hover{
  background:var(--paper);
  border-color:var(--paper);
}

/* --- progress --- */
.header-progress{
  position:absolute;
  left:0;
  right:0;
  bottom:-1px;
  height:2px;
  pointer-events:none;
}
.header-progress-bar{
  display:block;
  height:100%;
  width:100%;
  background:var(--gold);
  transform:scaleX(0);
  transform-origin:0 50%;
  transition:transform .1s linear;
}

/* ---------- header responsive ---------- */
@media (max-width:1180px){
  .nav-index{ display:none; }
  .nav-link{ padding-inline:8px; font-size:13px; }
  .header-inner{ grid-template-columns:minmax(160px,210px) 1fr auto; }
}

@media (max-width:900px){
  .header-inner{
    grid-template-columns:1fr auto;
    gap:12px;
  }
  .brand{ grid-column:1; }
  .nav-toggle{ display:inline-flex; grid-column:2; }

  .site-nav{
    position:fixed;
    top:calc(var(--header-h) + 1px);
    left:0;
    right:0;
    max-height:calc(100vh - var(--header-h) - 1px);
    max-height:calc(100dvh - var(--header-h) - 1px);
    display:block;
    padding:10px var(--gutter) 26px;
    background:var(--ink);
    color:var(--paper);
    border-bottom:2px solid var(--gold);
    overflow:auto;
    opacity:0;
    visibility:hidden;
    transform:translateY(-10px);
    transition:opacity .16s var(--ease),
               transform .16s var(--ease),
               visibility .16s linear;
  }
  .site-nav[data-open="true"]{
    opacity:1;
    visibility:visible;
    transform:translateY(0);
  }

  .nav-list{
    flex-direction:column;
    align-items:stretch;
    gap:0;
    margin-bottom:18px;
  }
  .nav-item{
    border-left:1px solid rgba(200,162,74,.35);
    border-top:1px solid var(--hairline-light);
  }
  .nav-item:last-child{ border-bottom:1px solid var(--hairline-light); }

  .nav-link{
    display:flex;
    align-items:center;
    gap:12px;
    width:100%;
    padding:15px 4px 15px 14px;
    font-size:1.02rem;
    color:var(--gold-light);
    border-bottom:0;
  }
  .nav-link:hover,
  .nav-link[aria-current="page"]{
    color:var(--paper);
    background:rgba(200,162,74,.12);
    border-bottom:0;
  }
  .nav-index{ display:inline; font-size:10.5px; }

  .nav-tail{ display:block; }
  .nav-cta{
    display:flex;
    justify-content:center;
    margin-left:0;
    padding:14px 16px;
    font-size:12.5px;
    background:var(--gold);
    color:var(--ink);
    border-color:var(--gold);
  }
}

/* ============================================================
   5. FOOTER — 四栏展签
   ============================================================ */
.site-footer{
  background:var(--ink);
  color:var(--paper);
  border-top:3px solid var(--gold);
}

.footer-inner{
  width:100%;
  max-width:var(--shell);
  margin-inline:auto;
  padding:clamp(38px,5.5vw,72px) var(--gutter) 26px;
}

.footer-grid{
  display:grid;
  grid-template-columns:1.5fr 1fr 1.4fr 1fr;
  gap:clamp(22px,3.6vw,56px);
  padding-bottom:clamp(26px,4vw,46px);
  border-bottom:1px solid var(--hairline-light);
}

.footer-col{ min-width:0; }

.footer-col--brand{
  padding-left:18px;
  border-left:2px solid var(--gold);
}

.footer-mark{
  display:block;
  margin-bottom:14px;
  font-family:var(--font-mono);
  font-size:10.5px;
  letter-spacing:.34em;
  color:var(--gold);
}

.footer-brand{
  margin-bottom:10px;
  font-family:var(--font-display);
  font-weight:900;
  font-size:clamp(1.4rem,2.6vw,1.9rem);
  line-height:1.15;
  letter-spacing:.02em;
  color:var(--paper);
}

.footer-desc{
  margin-bottom:14px;
  max-width:32ch;
  font-size:13.5px;
  line-height:1.65;
  color:rgba(247,242,230,.72);
}

.footer-mono{
  font-family:var(--font-mono);
  font-size:11.5px;
  letter-spacing:.08em;
  color:rgba(247,242,230,.55);
  word-break:break-word;
}

.footer-title{
  margin-bottom:16px;
  padding-top:10px;
  border-top:1px solid rgba(200,162,74,.45);
  font-family:var(--font-mono);
  font-size:11px;
  font-weight:500;
  letter-spacing:.2em;
  color:var(--gold);
}

.footer-list{
  display:grid;
  gap:9px;
  font-size:13.5px;
}

.footer-list a{
  display:inline-block;
  color:rgba(247,242,230,.82);
  text-decoration:none;
  border-bottom:1px solid transparent;
  transition:color .15s var(--ease), border-color .15s var(--ease);
}
.footer-list a:hover{
  color:var(--gold-light);
  border-bottom-color:var(--gold);
}

.footer-list--plain li{
  display:grid;
  gap:3px;
  font-family:var(--font-mono);
  font-size:12.5px;
  line-height:1.5;
  color:rgba(247,242,230,.82);
  word-break:break-word;
}

.footer-key{
  font-family:var(--font-mono);
  font-size:10px;
  letter-spacing:.18em;
  color:rgba(200,162,74,.9);
}

.footer-note{
  margin-top:16px;
  padding-left:10px;
  border-left:2px solid var(--cinnabar);
  font-size:12px;
  line-height:1.65;
  color:rgba(247,242,230,.58);
}

.footer-icp{ margin-top:16px; }

.footer-base{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:12px;
  padding-top:20px;
  font-family:var(--font-mono);
  font-size:11.5px;
  letter-spacing:.05em;
  color:rgba(247,242,230,.5);
}

.footer-copy,
.footer-hours{ margin:0; }

.footer-hours::before{
  content:"";
  display:inline-block;
  width:6px;
  height:6px;
  margin-right:8px;
  background:var(--cinnabar);
  vertical-align:middle;
}

@media (max-width:900px){
  .footer-grid{ grid-template-columns:1fr 1fr; }
  .footer-col--brand{ grid-column:1 / -1; }
}

@media (max-width:560px){
  .footer-grid{ grid-template-columns:1fr; }
  .footer-col--brand{ padding-left:14px; }
  .footer-base{ flex-direction:column; align-items:flex-start; }
}

/* ============================================================
   6. 通用容器与分区
   ============================================================ */
.shell{
  width:100%;
  max-width:var(--shell);
  margin-inline:auto;
  padding-inline:var(--gutter);
}

.shell--narrow{ max-width:820px; }

.section{ padding-block:clamp(44px,6vw,88px); }
.section--paper2{ background:var(--paper-2); }
.section--ink{
  background:var(--ink);
  color:var(--paper);
}
.section--ink h1,
.section--ink h2,
.section--ink h3{ color:var(--paper); }

.rule{
  border:0;
  height:1px;
  margin:0;
  background:var(--hairline);
}

.eyebrow{
  display:inline-flex;
  align-items:center;
  gap:9px;
  font-family:var(--font-mono);
  font-size:11.5px;
  letter-spacing:.2em;
  color:var(--ink-2);
}
.eyebrow::before{
  content:"";
  width:22px;
  height:2px;
  background:var(--gold);
}

/* ============================================================
   7. 按钮
   ============================================================ */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:10px;
  padding:13px 22px;
  background:transparent;
  border:1px solid var(--ink);
  color:var(--ink);
  font-family:var(--font-body);
  font-size:14px;
  font-weight:600;
  letter-spacing:.04em;
  line-height:1.2;
  text-decoration:none;
  cursor:pointer;
  transition:background-color .15s var(--ease),
             color .15s var(--ease),
             border-color .15s var(--ease);
}
.btn:hover{
  background:var(--ink);
  color:var(--paper);
}

.btn--solid{
  background:var(--ink);
  color:var(--paper);
}
.btn--solid:hover{
  background:var(--gold);
  border-color:var(--gold);
  color:var(--ink);
}

.btn--gold{
  background:var(--gold);
  border-color:var(--gold);
  color:var(--ink);
}
.btn--gold:hover{
  background:var(--ink);
  border-color:var(--ink);
  color:var(--paper);
}

.btn--ghost{
  border-color:rgba(14,42,36,.3);
  color:var(--ink-2);
}
.btn--ghost:hover{
  background:var(--ink-2);
  border-color:var(--ink-2);
  color:var(--paper);
}

/* ============================================================
   8. 面包屑
   ============================================================ */
.breadcrumb{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:8px;
  font-family:var(--font-mono);
  font-size:11.5px;
  letter-spacing:.06em;
  color:var(--sage);
}
.breadcrumb li{
  display:inline-flex;
  align-items:center;
  gap:8px;
}
.breadcrumb li + li::before{
  content:"/";
  color:var(--gold);
}
.breadcrumb a{
  color:var(--sage);
  text-decoration:none;
  border-bottom:1px solid transparent;
  transition:color .15s var(--ease), border-color .15s var(--ease);
}
.breadcrumb a:hover{
  color:var(--ink);
  border-bottom-color:var(--gold);
}
.breadcrumb [aria-current="page"]{ color:var(--ink); }

/* ============================================================
   9. 说明牌 / 标签
   ============================================================ */
.plate{
  position:relative;
  padding:clamp(18px,2.4vw,28px);
  background:var(--paper);
  border:1px solid var(--hairline);
  border-left:3px solid var(--gold);
}

.plate__index{
  display:block;
  margin-bottom:10px;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.16em;
  color:var(--cinnabar);
}

.plate__title{
  margin-bottom:8px;
  font-family:var(--font-display);
  font-weight:900;
  font-size:clamp(1.05rem,2vw,1.35rem);
  line-height:1.25;
  color:var(--ink);
}

.plate__body{
  font-size:14px;
  line-height:1.62;
  color:var(--graphite);
}
.plate__body + .plate__body{ margin-top:8px; }

.tag{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:3px 9px;
  background:var(--gold-light);
  border:1px solid rgba(14,42,36,.16);
  color:var(--ink);
  font-family:var(--font-mono);
  font-size:10.5px;
  letter-spacing:.1em;
  line-height:1.5;
}

.tag--alert{
  background:rgba(178,58,47,.12);
  border-color:rgba(178,58,47,.35);
  color:var(--cinnabar);
}

/* ============================================================
   10. 对照栅格
   ============================================================ */
.grid-2{
  display:grid;
  grid-template-columns:repeat(2,minmax(0,1fr));
  gap:clamp(20px,3vw,44px);
}

.grid-2--mirror{ position:relative; }
.grid-2--mirror::before{
  content:"";
  position:absolute;
  top:0;
  bottom:0;
  left:50%;
  width:1px;
  background:rgba(14,42,36,.2);
  transform:translateX(-.5px);
}

@media (max-width:820px){
  .grid-2{ grid-template-columns:1fr; }
  .grid-2--mirror::before{ display:none; }
}

/* ============================================================
   11. 图片容器
   ============================================================ */
.figure{
  display:grid;
  gap:10px;
  margin:0;
}

.figure__frame{
  position:relative;
  overflow:hidden;
  aspect-ratio:16 / 10;
  background:var(--paper-2);
  border:1px solid rgba(14,42,36,.24);
}

.figure__frame::before{
  content:"";
  position:absolute;
  inset:0;
  background-image:
    linear-gradient(rgba(14,42,36,.07) 1px, transparent 1px),
    linear-gradient(90deg, rgba(14,42,36,.07) 1px, transparent 1px);
  background-size:28px 28px;
  pointer-events:none;
}

.figure__frame::after{
  content:"";
  position:absolute;
  top:0;
  right:0;
  z-index:2;
  border-style:solid;
  border-width:0 24px 24px 0;
  border-color:transparent var(--paper) transparent transparent;
  pointer-events:none;
}

.figure__frame img{
  position:relative;
  z-index:1;
  width:100%;
  height:100%;
  object-fit:cover;
}

.figure__cap{
  font-family:var(--font-mono);
  font-size:11.5px;
  line-height:1.5;
  letter-spacing:.05em;
  color:var(--sage);
}
.figure__cap b{
  font-weight:600;
  color:var(--ink);
}

.figure--wide .figure__frame{ aspect-ratio:21 / 9; }
.figure--tall .figure__frame{ aspect-ratio:4 / 5; }
.figure--square .figure__frame{ aspect-ratio:1 / 1; }

@media (max-width:640px){
  .figure--wide .figure__frame{ aspect-ratio:16 / 10; }
  .figure--tall .figure__frame{ aspect-ratio:1 / 1; }
}

/* ============================================================
   12. 侧边导览轨道
   ============================================================ */
.track{
  display:grid;
  gap:0;
  border-left:1px solid var(--hairline);
}

.track__item{
  display:grid;
  grid-template-columns:auto 1fr;
  align-items:baseline;
  gap:10px;
  margin-left:-1px;
  padding:9px 0 9px 14px;
  border-left:2px solid transparent;
  font-size:13px;
  color:var(--sage);
  text-decoration:none;
  transition:color .15s var(--ease),
             border-color .15s var(--ease),
             background-color .15s var(--ease);
}
.track__item:hover{
  color:var(--ink);
  border-left-color:var(--gold-light);
  background:rgba(200,162,74,.07);
}
.track__item[data-active="true"]{
  color:var(--ink);
  border-left-color:var(--gold);
  background:rgba(200,162,74,.10);
}

.track__num{
  font-family:var(--font-mono);
  font-size:10.5px;
  letter-spacing:.08em;
  color:var(--gold);
}

.track__label{ line-height:1.35; }