/* =========================================================
   皇冠 CN · 共享样式 /assets/site.css
   墨黑纸面 · 皇冠金编号 · 印刷边框 · 索引轴
   ========================================================= */

/* ---------- 0. 变量 ---------- */
:root{
  --gold:#C9A227;
  --gold-light:#E7CF8E;
  --gold-deep:#8C6D1F;
  --gold-old:#A8894E;
  --ink:#0E0E10;
  --charcoal:#1A1B1F;
  --graphite:#2A2C33;
  --crimson:#8E2B33;
  --steel:#6E7C86;
  --cream:#F4F0E6;
  --paper:#FBF9F4;

  --font-display:"Songti SC","Source Han Serif SC","Noto Serif SC","SimSun",Georgia,"Times New Roman",serif;
  --font-body:"PingFang SC","Source Han Sans SC","Noto Sans SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",sans-serif;
  --font-mono:"IBM Plex Mono","SFMono-Regular",Menlo,Consolas,"Courier New",monospace;

  --step-1:14px; --step0:17px; --step1:21px; --step2:26px;
  --step3:33px; --step4:41px; --step5:52px; --step6:65px;

  --gutter:clamp(18px,4vw,56px);
  --rail:240px;
  --header-h:78px;
  --header-h-m:68px;
  --shadow-anchor:0 18px 40px -24px rgba(0,0,0,.9),0 0 0 1px rgba(201,162,39,.32);
  --ease:cubic-bezier(.22,.61,.36,1);
}

/* ---------- 1. Reset ---------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{margin:0;min-height:100%}
img,svg,video{display:block;max-width:100%}
ul,ol{margin:0;padding:0;list-style:none}
h1,h2,h3,h4,h5,h6,p,figure,blockquote,table,dl,dd{margin:0}
button{font:inherit;color:inherit;background:none;border:0;padding:0}
a{color:inherit;text-decoration:none}
table{border-collapse:collapse;width:100%}
main{display:block}

/* ---------- 2. 中文排版基座 ---------- */
body{
  background-color:var(--ink);
  background-image:
    repeating-linear-gradient(45deg,rgba(201,162,39,.035) 0 1px,transparent 1px 11px),
    repeating-linear-gradient(-45deg,rgba(201,162,39,.022) 0 1px,transparent 1px 15px);
  color:var(--cream);
  font-family:var(--font-body);
  font-size:var(--step0);
  line-height:1.75;
  letter-spacing:.01em;
  word-break:normal;
  line-break:strict;
  -webkit-font-smoothing:antialiased;
}
h1,h2,h3,h4{font-family:var(--font-display);font-weight:600;line-height:1.06;letter-spacing:.01em}
p{max-width:74ch}
.mono{font-family:var(--font-mono);font-variant-numeric:tabular-nums;letter-spacing:.04em}
::selection{background:var(--gold);color:var(--ink)}
:focus-visible{outline:2px solid var(--gold-light);outline-offset:2px}

/* ---------- 3. 布局容器与网格 ---------- */
.wrap{width:100%;max-width:1180px;margin:0 auto;padding:0 var(--gutter)}
.wrap--wide{max-width:1380px}
.wrap--narrow{max-width:820px}

.grid-12{display:grid;grid-template-columns:repeat(12,minmax(0,1fr));gap:clamp(16px,2vw,28px)}
.col-3{grid-column:span 3}
.col-4{grid-column:span 4}
.col-5{grid-column:span 5}
.col-6{grid-column:span 6}
.col-7{grid-column:span 7}
.col-9{grid-column:span 9}
.col-12{grid-column:span 12}

@media (max-width:760px){
  .grid-12 > [class*="col-"]{grid-column:span 12}
}

/* ---------- 4. 跳转链接 ---------- */
.skip-link{
  position:fixed;left:14px;top:-72px;z-index:400;
  padding:11px 18px;background:var(--gold);color:var(--ink);
  font-family:var(--font-mono);font-size:13px;letter-spacing:.1em;
  transition:top .18s var(--ease);
}
.skip-link:focus{top:14px}

/* ---------- 5. 头部 ---------- */
.site-header{
  position:sticky;top:0;z-index:120;
  background:linear-gradient(180deg,#0E0E10 0%,#121216 100%);
  border-bottom:1px solid var(--gold-deep);
  box-shadow:0 1px 0 rgba(201,162,39,.1);
}
.progress-rail{
  position:absolute;left:0;right:0;top:0;height:2px;
  background:rgba(140,109,31,.32);overflow:hidden;
}
.progress-fill{
  display:block;height:100%;width:100%;
  background:linear-gradient(90deg,var(--gold-deep),var(--gold-light));
  transform:scaleX(0);transform-origin:0 50%;
  transition:transform .12s linear;
}
.header-inner{
  max-width:1440px;margin:0 auto;
  padding:0 var(--gutter);
  height:var(--header-h);
  display:flex;align-items:center;justify-content:space-between;gap:clamp(16px,3vw,40px);
}

/* 品牌铭牌 */
.brand{display:flex;align-items:center;gap:14px;flex:0 0 auto}
.brand-plate{
  display:grid;place-items:center;width:40px;height:40px;position:relative;
  border:1px solid var(--gold);color:var(--gold);
  font-family:var(--font-mono);font-size:13px;letter-spacing:.08em;
  background:linear-gradient(155deg,rgba(201,162,39,.18),rgba(201,162,39,0));
}
.brand-plate::after{content:"";position:absolute;inset:3px;border:1px solid rgba(201,162,39,.32)}
.brand-text{display:flex;flex-direction:column;line-height:1.2}
.brand-name{font-family:var(--font-display);font-size:20px;font-weight:600;letter-spacing:.12em;color:var(--cream)}
.brand-sub{font-family:var(--font-mono);font-size:10px;letter-spacing:.24em;color:var(--steel)}

/* 导航 */
.site-nav{display:flex;align-items:center;gap:clamp(18px,2.6vw,36px);min-width:0}
.nav-list{display:flex;align-items:center;gap:clamp(14px,1.9vw,28px)}
.nav-link{
  position:relative;display:inline-block;padding:7px 2px;
  font-size:14px;letter-spacing:.07em;color:var(--gold-light);
  transition:color .18s var(--ease);
}
.nav-link::after{
  content:"";position:absolute;left:50%;bottom:1px;width:6px;height:6px;border-radius:50%;
  background:var(--crimson);transform:translateX(-50%) scale(0);
  transition:transform .18s var(--ease);
}
.nav-link:hover{color:var(--gold)}
.nav-link[aria-current="page"]{color:var(--cream)}
.nav-link[aria-current="page"]::after{transform:translateX(-50%) scale(1)}

.nav-utility{
  display:flex;align-items:center;gap:16px;
  padding-left:clamp(14px,1.9vw,26px);border-left:1px solid var(--graphite);
}
.util-link{
  font-family:var(--font-mono);font-size:12px;letter-spacing:.14em;color:var(--steel);
  padding:4px 0;border-bottom:1px solid transparent;
  transition:color .18s var(--ease),border-color .18s var(--ease);
}
.util-link:hover{color:var(--gold);border-bottom-color:var(--gold-old)}

/* 移动端按钮 */
.nav-toggle{
  display:none;align-items:center;gap:9px;cursor:pointer;
  padding:9px 13px;border:1px solid var(--gold-deep);
  background:rgba(201,162,39,.06);
}
.nav-toggle-bar{width:16px;height:1px;background:var(--gold-light);transition:transform .2s var(--ease)}
.nav-toggle-label{font-family:var(--font-mono);font-size:11px;letter-spacing:.2em;color:var(--gold-light)}
.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(1){transform:translateY(2.5px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(2){transform:translateY(-2.5px) rotate(-45deg)}

/* ---------- 6. 移动导航 ---------- */
@media (max-width:900px){
  .header-inner{height:var(--header-h-m);padding:0 clamp(14px,4vw,22px)}
  .brand-plate{width:34px;height:34px;font-size:12px}
  .brand-name{font-size:17px}
  .brand-sub{display:none}
  .nav-toggle{display:inline-flex}

  .site-nav{
    position:fixed;left:0;right:0;top:var(--header-h-m);z-index:110;
    flex-direction:column;align-items:stretch;gap:0;
    background:linear-gradient(180deg,#17181C 0%,#101114 100%);
    border-bottom:1px solid var(--gold-deep);
    max-height:0;overflow:hidden;padding:0 clamp(14px,4vw,22px);
    transition:max-height .3s var(--ease),padding .3s var(--ease);
  }
  .site-nav[data-open="true"]{max-height:84vh;overflow-y:auto;padding:12px clamp(14px,4vw,22px) 26px}

  .nav-list{flex-direction:column;align-items:stretch;gap:0}
  .nav-list li{border-bottom:1px solid var(--graphite)}
  .nav-list li:first-child{border-top:1px solid var(--graphite)}
  .nav-link{display:block;padding:15px 2px;font-size:16px;color:var(--cream)}
  .nav-link::after{left:auto;right:4px;bottom:50%;transform:translateY(50%) scale(0)}
  .nav-link[aria-current="page"]::after{transform:translateY(50%) scale(1)}

  .nav-utility{
    flex-direction:column;align-items:flex-start;gap:0;
    padding:14px 0 0;margin-top:14px;
    border-left:0;border-top:1px solid var(--gold-deep);
  }
  .util-link{padding:11px 0;font-size:12.5px;border-bottom:0}
  .util-link:hover{color:var(--gold)}
}

/* ---------- 7. 页脚 ---------- */
.site-footer{
  position:relative;
  background:linear-gradient(180deg,#111216 0%,#0B0B0D 100%);
  border-top:1px solid var(--gold-deep);
  color:var(--gold-light);
  margin-top:clamp(56px,8vw,110px);
}
.site-footer::before{
  content:"";position:absolute;inset:0;pointer-events:none;
  background-image:
    repeating-linear-gradient(45deg,rgba(201,162,39,.05) 0 1px,transparent 1px 9px),
    repeating-linear-gradient(-45deg,rgba(201,162,39,.032) 0 1px,transparent 1px 13px);
}
.footer-inner{
  position:relative;max-width:1440px;margin:0 auto;
  padding:clamp(52px,7vw,92px) var(--gutter) 0;
  display:grid;grid-template-columns:minmax(240px,1fr) minmax(0,2.6fr);
  gap:clamp(28px,4vw,60px);
}
.footer-brand{display:flex;flex-direction:column;gap:12px}
.footer-mark{
  display:flex;align-items:center;gap:12px;
  font-family:var(--font-display);font-size:24px;font-weight:600;
  letter-spacing:.14em;color:var(--cream);max-width:none;
}
.footer-plate{
  display:grid;place-items:center;width:32px;height:32px;flex:0 0 auto;
  border:1px solid var(--gold);color:var(--gold);
  font-family:var(--font-mono);font-size:11px;letter-spacing:.06em;
}
.footer-note{font-size:14px;color:var(--steel);max-width:30ch}
.footer-hours{
  font-family:var(--font-mono);font-size:12px;letter-spacing:.06em;color:var(--gold-light);
  border-left:2px solid var(--crimson);padding-left:12px;max-width:34ch;
}

.footer-index{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:clamp(20px,3vw,42px)}
.footer-col{min-width:0}
.footer-col-title{
  font-family:var(--font-mono);font-size:11px;font-weight:400;letter-spacing:.24em;
  color:var(--gold);padding-bottom:12px;margin-bottom:14px;
  border-bottom:1px solid var(--graphite);
}
.footer-list{counter-reset:fidx;display:grid;gap:2px}
.footer-link{
  display:flex;align-items:baseline;gap:10px;padding:6px 0;
  font-size:14px;color:var(--gold-light);
  transition:color .18s var(--ease),padding-left .18s var(--ease);
}
.footer-link::before{
  counter-increment:fidx;content:counter(fidx,decimal-leading-zero);
  font-family:var(--font-mono);font-size:11px;color:var(--gold-deep);flex:0 0 auto;
}
.footer-link:hover{color:var(--gold);padding-left:5px}

.footer-meta{
  position:relative;max-width:1440px;margin:clamp(38px,5vw,64px) auto 0;
  padding:24px var(--gutter) 30px;
  border-top:1px solid var(--graphite);
  display:grid;gap:16px;
}
.footer-contact{
  font-size:13px;line-height:1.8;color:var(--steel);max-width:96ch;letter-spacing:.02em;
}
.footer-legal{display:flex;flex-wrap:wrap;gap:10px 24px;align-items:center;justify-content:space-between}
.footer-legal-item{font-family:var(--font-mono);font-size:12px;letter-spacing:.08em;color:var(--steel)}
.footer-icp{color:var(--gold-old)}

@media (max-width:980px){
  .footer-inner{grid-template-columns:1fr}
  .footer-index{grid-template-columns:repeat(2,minmax(0,1fr))}
}
@media (max-width:560px){
  .footer-index{grid-template-columns:1fr}
  .footer-legal{flex-direction:column;align-items:flex-start}
}

/* ---------- 8. 按钮 ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:10px;
  padding:13px 24px;border:1px solid var(--gold);background:transparent;
  color:var(--gold-light);font-family:var(--font-mono);font-size:13px;letter-spacing:.14em;
  cursor:pointer;text-align:center;
  transition:background .16s var(--ease),color .16s var(--ease),border-color .16s var(--ease),transform .16s var(--ease);
}
.btn:hover{background:rgba(201,162,39,.14);color:var(--cream)}
.btn:active{transform:translateY(1px)}
.btn--gold{background:var(--gold);color:var(--ink);border-color:var(--gold)}
.btn--gold:hover{background:var(--gold-light);color:var(--ink)}
.btn--ghost{border-color:var(--graphite);color:var(--gold-light)}
.btn--ghost:hover{border-color:var(--gold-deep);background:rgba(201,162,39,.08)}
.btn--paper{background:var(--paper);color:var(--ink);border-color:var(--gold-deep)}
.btn--paper:hover{background:var(--cream);color:var(--ink)}
.btn--sm{padding:9px 16px;font-size:12px;letter-spacing:.1em}

/* ---------- 9. 面包屑 ---------- */
.breadcrumb{
  display:flex;flex-wrap:wrap;align-items:center;gap:8px;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.08em;color:var(--steel);
}
.breadcrumb li{display:flex;align-items:center;gap:8px}
.breadcrumb li + li::before{content:"/";color:var(--gold-deep)}
.breadcrumb a{color:var(--gold-light);border-bottom:1px solid transparent;transition:color .16s var(--ease),border-color .16s var(--ease)}
.breadcrumb a:hover{color:var(--gold);border-bottom-color:var(--gold-old)}

/* ---------- 10. 章节节奏 ---------- */
.chapter{position:relative;padding:clamp(60px,8vw,116px) 0}
.chapter + .chapter{border-top:1px solid rgba(140,109,31,.42)}
.chapter-head{
  display:grid;grid-template-columns:auto minmax(0,1fr);
  gap:clamp(14px,2.2vw,30px);align-items:start;
  margin-bottom:clamp(26px,4vw,48px);
}
.chapter-num{
  font-family:var(--font-mono);font-size:clamp(40px,7vw,88px);line-height:.88;
  color:var(--gold);letter-spacing:-.02em;
}
.chapter-kicker{
  display:block;font-family:var(--font-mono);font-size:12px;letter-spacing:.24em;
  color:var(--steel);margin-bottom:10px;
}
.chapter-title{font-size:clamp(28px,3.6vw,52px);line-height:1.04}
.chapter-lead{margin-top:14px;font-size:var(--step1);line-height:1.7;color:var(--gold-light);max-width:66ch}

/* ---------- 11. 标签 / 铭牌 ---------- */
.plate{
  display:inline-flex;align-items:center;gap:10px;
  padding:6px 12px;border:1px solid var(--gold-deep);
  background:linear-gradient(150deg,rgba(201,162,39,.16),rgba(251,249,244,.02));
  font-family:var(--font-mono);font-size:12px;letter-spacing:.16em;color:var(--gold-light);
}
.tag-label{
  display:inline-flex;align-items:center;gap:8px;
  padding:5px 11px;background:var(--paper);color:var(--ink);
  border:1px solid var(--gold-deep);font-size:12.5px;letter-spacing:.06em;
}
.tag-dot{width:6px;height:6px;border-radius:50%;background:var(--crimson);flex:0 0 auto}
.tag-label--muted .tag-dot{background:var(--steel)}

/* ---------- 12. 纵向索引轴 ---------- */
.index-axis{
  position:sticky;top:calc(var(--header-h) + 32px);
  align-self:start;width:var(--rail);
  border-left:1px solid var(--gold-deep);padding-left:18px;
}
.index-axis-title{
  font-family:var(--font-mono);font-size:11px;letter-spacing:.24em;
  color:var(--steel);margin-bottom:16px;
}
.index-axis-list{counter-reset:axis;display:grid;gap:2px}
.index-axis-link{
  display:flex;align-items:baseline;gap:10px;padding:8px 0;
  font-size:14px;color:var(--gold-light);
  transition:color .18s var(--ease),padding-left .18s var(--ease);
}
.index-axis-link::before{
  counter-increment:axis;content:counter(axis,decimal-leading-zero);
  font-family:var(--font-mono);font-size:11px;color:var(--gold-deep);flex:0 0 auto;
}
.index-axis-link:hover{color:var(--gold);padding-left:5px}
.index-axis-link.is-active,
.index-axis-link[aria-current="true"]{color:var(--cream)}
.index-axis-link.is-active::before,
.index-axis-link[aria-current="true"]::before{color:var(--crimson)}

@media (max-width:980px){
  .index-axis{
    position:static;width:auto;border-left:0;border-top:1px solid var(--gold-deep);
    padding:16px 0 0;
  }
  .index-axis-list{grid-template-columns:repeat(2,minmax(0,1fr));gap:2px 18px}
}

/* ---------- 13. 版本锚点卡片 ---------- */
.anchor-card{
  position:relative;
  background:linear-gradient(160deg,var(--charcoal),#141519);
  border:1px solid var(--gold);
  padding:clamp(18px,2.4vw,26px);
  box-shadow:var(--shadow-anchor);
  transition:transform .16s var(--ease),border-color .16s var(--ease);
}
.anchor-card:hover{transform:translateY(-3px);border-color:var(--gold-light)}
.anchor-card-ver{
  font-family:var(--font-mono);font-size:clamp(20px,2.4vw,28px);
  color:var(--gold-light);white-space:nowrap;letter-spacing:.02em;
}
.anchor-card-meta{font-size:13px;color:var(--steel);margin-top:8px}

/* ---------- 14. 图片容器 ---------- */
.figure{margin:0;border:1px solid var(--gold-deep);background:var(--charcoal);overflow:hidden}
.figure-frame{
  position:relative;display:block;overflow:hidden;
  background-image:
    linear-gradient(135deg,rgba(201,162,39,.14),rgba(142,43,51,.1)),
    repeating-linear-gradient(45deg,rgba(201,162,39,.06) 0 1px,transparent 1px 10px);
}
.figure-frame::after{
  content:"";position:absolute;inset:10px;border:1px solid rgba(201,162,39,.26);
  pointer-events:none;
}
.figure-frame img,.figure-frame svg{width:100%;height:100%;object-fit:cover}
.figure-frame--16x9{aspect-ratio:16/9}
.figure-frame--4x3{aspect-ratio:4/3}
.figure-frame--1x1{aspect-ratio:1/1}
.figure-frame--3x4{aspect-ratio:3/4}
.figure-caption{
  display:flex;flex-wrap:wrap;justify-content:space-between;gap:10px;
  padding:12px 14px;border-top:1px solid var(--gold-deep);
  font-family:var(--font-mono);font-size:11.5px;letter-spacing:.06em;color:var(--steel);
}

/* ---------- 15. 数据表 / 版本对照 ---------- */
.table-wrap{overflow-x:auto;border:1px solid var(--gold-deep);background:var(--paper);color:var(--ink)}
.data-table{width:100%;min-width:640px;font-size:15px;line-height:1.6}
.data-table thead th{
  background:var(--charcoal);color:var(--gold-light);
  font-family:var(--font-mono);font-size:12px;font-weight:400;letter-spacing:.12em;
  text-align:left;padding:14px 16px;border-bottom:1px solid var(--gold-deep);white-space:nowrap;
}
.data-table td{padding:14px 16px;border-bottom:1px solid rgba(140,109,31,.35);vertical-align:top}
.data-table tbody tr:nth-child(even){background:rgba(26,27,31,.05)}
.data-table tbody tr:hover{background:rgba(201,162,39,.18)}
.data-table .col-ver{
  font-family:var(--font-mono);color:#6B5013;white-space:nowrap;letter-spacing:.02em;
}
.copy-btn{
  margin-left:10px;padding:3px 9px;border:1px solid var(--gold-deep);
  background:transparent;color:#6B5013;
  font-family:var(--font-mono);font-size:11px;letter-spacing:.08em;cursor:pointer;
  opacity:0;transition:opacity .16s var(--ease),background .16s var(--ease),color .16s var(--ease);
}
.data-table tbody tr:hover .copy-btn,.copy-btn:focus-visible{opacity:1}
.copy-btn.is-copied{background:var(--gold);color:var(--ink);opacity:1}
@media (hover:none){.copy-btn{opacity:1}}

/* ---------- 16. 低动态偏好 ---------- */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
    scroll-behavior:auto !important;
  }
  .anchor-card:hover{transform:none}
  .footer-link:hover,.index-axis-link:hover{padding-left:0}
}