/* ============================================================
   皇冠体肓官 · 共享样式 /assets/site.css
   墨黑底 + 暖金强调 + 蓝图网格 + 纸张叠层
   ============================================================ */

:root{
  --ink:#0B0C0D;
  --char:#121417;
  --panel:#1C2025;
  --paper:#F4F0E8;
  --edge:#D9D2C4;
  --gold:#C9A227;
  --gold-lit:#E8C766;
  --amber:#FF8A1F;
  --cool:#7C9299;
  --cool-soft:#AFC2C6;
  --moss:#4F7A5A;
  --brick:#B94A3B;

  --hair:rgba(175,194,198,.20);
  --hair-strong:rgba(175,194,198,.40);
  --gold-hair:rgba(201,162,39,.42);

  --shell:1280px;
  --gutter:clamp(20px,4.2vw,72px);

  --font-display:"Oswald","Bebas Neue","HarmonyOS Sans SC","Noto Sans SC","Source Han Sans SC","PingFang SC","Microsoft YaHei",system-ui,sans-serif;
  --font-body:"HarmonyOS Sans SC","Noto Sans SC","Source Han Sans SC","PingFang SC","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",sans-serif;
  --font-mono:"IBM Plex Mono","JetBrains Mono","SFMono-Regular","Consolas","Menlo","Courier New",monospace;

  --ease:cubic-bezier(.22,.61,.36,1);
}

/* ---------- 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;padding:0}
ul,ol{list-style:none}
img,svg,video{display:block;max-width:100%}
button{font:inherit;color:inherit;background:none;border:0}
a{color:inherit;text-decoration:none}
table{border-collapse:collapse;width:100%}
::selection{background:var(--gold);color:var(--ink)}

/* ---------- 基础排版 ---------- */
body{
  background:var(--ink);
  color:var(--paper);
  font-family:var(--font-body);
  font-size:17px;
  line-height:1.78;
  letter-spacing:.005em;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
h1,h2,h3,h4{
  font-family:var(--font-display);
  font-weight:700;
  line-height:1.12;
  letter-spacing:-.005em;
  color:var(--paper);
}
h1{font-size:clamp(40px,6vw,88px)}
h2{font-size:clamp(28px,4vw,46px)}
h3{font-size:clamp(21px,2.4vw,28px)}
p{max-width:70ch}
strong{font-weight:700;color:var(--paper)}

:focus-visible{
  outline:2px solid var(--gold-lit);
  outline-offset:3px;
  border-radius:2px;
}

/* ---------- 跳转链接 ---------- */
.skip-link{
  position:fixed;
  top:-120px;
  left:16px;
  z-index:300;
  display:inline-block;
  padding:11px 20px;
  background:var(--gold);
  color:var(--ink);
  font-family:var(--font-mono);
  font-size:12.5px;
  letter-spacing:.14em;
  transition:top .2s var(--ease);
}
.skip-link:focus{top:14px}

/* ============================================================
   头部
   ============================================================ */
.site-header{
  position:sticky;
  top:0;
  z-index:90;
  background:var(--char);
  border-bottom:1px solid var(--hair-strong);
}

/* 上层：品牌说明带 */
.header-rail{
  background:var(--ink);
  border-bottom:1px solid var(--gold-hair);
}
.rail-inner{
  width:100%;
  max-width:var(--shell);
  margin:0 auto;
  padding:9px var(--gutter);
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:18px 28px;
}
.rail-line{
  display:flex;
  align-items:center;
  gap:10px;
  font-family:var(--font-mono);
  font-size:11.5px;
  line-height:1.4;
  letter-spacing:.12em;
  color:var(--cool-soft);
  max-width:none;
}
.rail-line::before{
  content:"";
  flex:none;
  width:20px;
  height:1px;
  background:var(--gold);
}
.rail-meta{
  display:flex;
  align-items:center;
  gap:24px;
  flex-wrap:wrap;
}
.rail-update{
  display:flex;
  align-items:center;
  gap:8px;
  max-width:none;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.1em;
  color:var(--cool);
}
.rail-dot{
  width:6px;
  height:6px;
  flex:none;
  border-radius:50%;
  background:var(--amber);
}
.rail-links{
  display:flex;
  align-items:center;
  gap:18px;
}
.rail-link{
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.1em;
  color:var(--cool-soft);
  border-bottom:1px solid transparent;
  padding-bottom:1px;
  transition:color .18s var(--ease),border-color .18s var(--ease);
}
.rail-link:hover,.rail-link:focus-visible{
  color:var(--gold-lit);
  border-bottom-color:var(--gold-lit);
}

/* 主栏 */
.header-main{
  position:relative;
  background-color:var(--char);
  background-image:linear-gradient(90deg,rgba(175,194,198,.055) 1px,transparent 1px);
  background-size:88px 100%;
}
.header-inner{
  position:relative;
  width:100%;
  max-width:var(--shell);
  margin:0 auto;
  padding:15px var(--gutter);
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:24px;
}

.brand{
  display:flex;
  align-items:center;
  gap:14px;
  flex:none;
}
.brand-mark{
  width:44px;
  height:44px;
  display:grid;
  place-items:center;
  flex:none;
  border:1px solid var(--gold);
  background:linear-gradient(150deg,rgba(201,162,39,.18),rgba(201,162,39,0) 62%);
  color:var(--gold-lit);
  font-family:var(--font-display);
  font-size:21px;
  font-weight:700;
  letter-spacing:.02em;
  box-shadow:4px 4px 0 -1px var(--char),4px 4px 0 0 var(--hair-strong);
  transition:box-shadow .2s var(--ease),border-color .2s var(--ease);
}
.brand:hover .brand-mark{
  border-color:var(--gold-lit);
  box-shadow:6px 6px 0 -1px var(--char),6px 6px 0 0 var(--gold-hair);
}
.brand-text{
  display:flex;
  flex-direction:column;
  gap:3px;
  line-height:1.1;
}
.brand-name{
  font-family:var(--font-display);
  font-size:22px;
  font-weight:700;
  letter-spacing:.08em;
  color:var(--paper);
}
.brand-signature{
  font-family:var(--font-mono);
  font-size:10.5px;
  letter-spacing:.24em;
  color:var(--cool);
}

/* 移动导航按钮 */
.nav-toggle{
  display:none;
  align-items:center;
  gap:10px;
  flex:none;
  padding:10px 14px;
  border:1px solid var(--hair-strong);
  color:var(--paper);
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.18em;
  cursor:pointer;
  transition:border-color .18s var(--ease),color .18s var(--ease),background .18s var(--ease);
}
.nav-toggle:hover{border-color:var(--gold);color:var(--gold-lit);background:rgba(201,162,39,.08)}
.nav-toggle-bars{
  position:relative;
  display:block;
  width:18px;
  height:10px;
  flex:none;
}
.nav-toggle-bars::before,
.nav-toggle-bars::after{
  content:"";
  position:absolute;
  left:0;
  right:0;
  height:1.5px;
  background:var(--gold-lit);
  transition:transform .2s var(--ease),top .2s var(--ease),bottom .2s var(--ease);
}
.nav-toggle-bars::before{top:0}
.nav-toggle-bars::after{bottom:0}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars::before{top:4px;transform:rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars::after{bottom:5px;transform:rotate(-45deg)}

/* 主导航 */
.primary-nav{
  display:flex;
  align-items:center;
}
.nav-list{
  display:flex;
  align-items:center;
  gap:2px;
}
.nav-link{
  position:relative;
  display:inline-flex;
  align-items:baseline;
  gap:7px;
  padding:10px 13px;
  border:1px solid transparent;
  color:var(--cool-soft);
  font-size:15px;
  line-height:1.3;
  letter-spacing:.03em;
  white-space:nowrap;
  transition:color .18s var(--ease),background .18s var(--ease),border-color .18s var(--ease);
}
.nav-num{
  font-family:var(--font-mono);
  font-size:10px;
  letter-spacing:.08em;
  color:var(--cool);
  transition:color .18s var(--ease);
}
.nav-link:hover{
  color:var(--paper);
  background:rgba(244,240,232,.05);
}
.nav-link:hover .nav-num{color:var(--gold)}
.nav-link[aria-current="page"]{
  color:var(--gold-lit);
  border-color:var(--gold-hair);
  background:rgba(201,162,39,.1);
}
.nav-link[aria-current="page"] .nav-num{color:var(--gold-lit)}
.nav-link[aria-current="page"]::after{
  content:"";
  position:absolute;
  left:13px;
  right:13px;
  bottom:3px;
  height:1px;
  background:var(--gold-lit);
}
.nav-foot-note{display:none}

/* 滚动进度 */
.scroll-meter{
  position:absolute;
  left:0;
  right:0;
  bottom:0;
  height:2px;
  pointer-events:none;
  background:transparent;
}
.scroll-meter-fill{
  display:block;
  height:100%;
  width:0;
  background:linear-gradient(90deg,var(--gold),var(--amber));
  transition:width .1s linear;
}

/* ============================================================
   页脚
   ============================================================ */
.site-footer{
  background:var(--char);
  color:var(--paper);
  border-top:1px solid var(--hair-strong);
}
.footer-shell{
  width:100%;
  max-width:var(--shell);
  margin:0 auto;
  padding:0 var(--gutter);
}

.footer-top{
  padding:clamp(38px,5.6vw,74px) 0 clamp(26px,3.6vw,46px);
  background-image:linear-gradient(90deg,rgba(175,194,198,.05) 1px,transparent 1px);
  background-size:88px 100%;
}
.footer-top .footer-shell{
  display:grid;
  grid-template-columns:minmax(220px,.9fr) minmax(0,1.5fr);
  gap:clamp(28px,4.6vw,68px);
  align-items:start;
}

.footer-brand-link{
  display:inline-block;
  padding-bottom:6px;
  border-bottom:1px solid var(--gold-hair);
  font-family:var(--font-display);
  font-size:clamp(24px,3.2vw,36px);
  font-weight:700;
  letter-spacing:.06em;
  color:var(--paper);
  transition:color .18s var(--ease),border-color .18s var(--ease);
}
.footer-brand-link:hover{color:var(--gold-lit);border-bottom-color:var(--gold-lit)}
.footer-tagline{
  margin-top:16px;
  max-width:24em;
  font-size:15px;
  line-height:1.7;
  color:var(--cool-soft);
}
.footer-index-line{
  margin-top:18px;
  max-width:none;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.16em;
  text-transform:uppercase;
  color:var(--gold);
}

.footer-nav{
  display:grid;
  grid-template-columns:repeat(2,minmax(0,1fr));
  gap:clamp(20px,3vw,44px);
}
.footer-col-title{
  margin-bottom:14px;
  padding-bottom:10px;
  border-bottom:1px solid var(--hair);
  font-family:var(--font-mono);
  font-size:11px;
  font-weight:400;
  letter-spacing:.2em;
  color:var(--cool);
}
.footer-list{
  display:flex;
  flex-direction:column;
  gap:2px;
}
.footer-link{
  display:inline-block;
  padding:6px 0;
  font-size:15px;
  line-height:1.5;
  color:var(--paper);
  border-bottom:1px solid transparent;
  transition:color .16s var(--ease),border-color .16s var(--ease);
}
.footer-link:hover,.footer-link:focus-visible{
  color:var(--gold-lit);
  border-bottom-color:var(--gold-hair);
}
.footer-link[aria-current="page"]{
  color:var(--gold-lit);
  border-bottom-color:var(--gold-lit);
}

.footer-contact{
  background:var(--ink);
  border-top:1px solid var(--hair);
  border-bottom:1px solid var(--hair);
}
.footer-contact-inner{
  display:grid;
  grid-template-columns:minmax(0,1.25fr) minmax(0,1fr);
  gap:10px clamp(20px,3vw,44px);
  padding:22px var(--gutter);
  font-family:var(--font-mono);
  font-size:12.5px;
  line-height:1.7;
  letter-spacing:.05em;
  color:var(--cool-soft);
}
.footer-contact-line{max-width:none}
.footer-address{max-width:none;color:var(--paper)}
.footer-label{
  margin-right:10px;
  font-size:10.5px;
  letter-spacing:.2em;
  color:var(--gold);
}
.footer-note{
  grid-column:1 / -1;
  max-width:none;
  font-size:11.5px;
  letter-spacing:.06em;
  color:var(--cool);
}

.footer-base{padding:18px 0 24px}
.footer-base-inner{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:10px 26px;
  font-family:var(--font-mono);
  font-size:11.5px;
  letter-spacing:.12em;
  color:var(--cool);
}
.footer-copy{max-width:none;color:var(--cool-soft)}
.footer-legal{max-width:none;color:var(--cool-soft)}
.footer-updated{max-width:none;color:var(--gold)}

/* ============================================================
   通用组件
   ============================================================ */
.content-shell{
  width:100%;
  max-width:var(--shell);
  margin:0 auto;
  padding:0 var(--gutter);
}

.prose{
  max-width:64ch;
  font-size:17px;
  line-height:1.82;
  color:rgba(244,240,232,.88);
}
.prose p + p{margin-top:1.05em}
.prose a{
  color:var(--gold-lit);
  border-bottom:1px solid var(--gold-hair);
}
.prose a:hover{border-bottom-color:var(--gold-lit)}
.prose h2,.prose h3{margin-top:1.6em;margin-bottom:.6em}
.prose ul,.prose ol{
  margin-top:1em;
  padding-left:1.2em;
  list-style:disc;
}
.prose li + li{margin-top:.4em}

.eyebrow{
  display:flex;
  align-items:center;
  gap:12px;
  font-family:var(--font-mono);
  font-size:11.5px;
  letter-spacing:.2em;
  text-transform:uppercase;
  color:var(--gold);
}
.eyebrow::after{
  content:"";
  flex:1;
  height:1px;
  background:var(--hair);
}
.mono-label{
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.16em;
  text-transform:uppercase;
  color:var(--cool);
}
.section-title{
  font-family:var(--font-display);
  font-size:clamp(28px,4vw,44px);
  line-height:1.1;
  letter-spacing:-.005em;
  color:var(--paper);
}
.rule{
  height:1px;
  border:0;
  background:var(--hair);
}
.stack{
  display:flex;
  flex-direction:column;
  gap:var(--stack-gap,16px);
}

.grid{
  display:grid;
  gap:clamp(16px,2.2vw,30px);
}
.grid--split{grid-template-columns:minmax(0,.85fr) minmax(0,1.6fr)}
.grid--halves{grid-template-columns:repeat(2,minmax(0,1fr))}

.panel{
  position:relative;
  background:var(--panel);
  border:1px solid var(--hair);
  padding:clamp(18px,2.4vw,30px);
}
.panel::before{
  content:"";
  position:absolute;
  top:-1px;
  left:-1px;
  width:26px;
  height:26px;
  border-top:1px solid var(--gold);
  border-left:1px solid var(--gold);
  opacity:.75;
  pointer-events:none;
}
.panel--paper{
  background:var(--paper);
  color:var(--ink);
  border-color:var(--edge);
  box-shadow:7px 7px 0 -1px var(--char),7px 7px 0 0 rgba(201,162,39,.28);
}
.panel--paper::before{border-color:var(--gold);opacity:1}
.panel--paper h2,.panel--paper h3{color:var(--ink)}
.panel--paper .mono-label{color:#5B6469}

.btn{
  display:inline-flex;
  align-items:center;
  gap:10px;
  padding:13px 22px;
  border:1px solid transparent;
  font-family:var(--font-mono);
  font-size:12.5px;
  letter-spacing:.14em;
  line-height:1.2;
  cursor:pointer;
  transition:background .18s var(--ease),color .18s var(--ease),border-color .18s var(--ease),box-shadow .18s var(--ease),transform .18s var(--ease);
}
.btn--primary{
  background:var(--amber);
  border-color:var(--amber);
  color:#180D02;
  font-weight:700;
  box-shadow:4px 4px 0 0 rgba(201,162,39,.4);
}
.btn--primary:hover{
  background:var(--gold-lit);
  border-color:var(--gold-lit);
  transform:translate(-1px,-1px);
  box-shadow:6px 6px 0 0 rgba(201,162,39,.45);
}
.btn--ghost{
  border-color:var(--hair-strong);
  color:var(--paper);
}
.btn--ghost:hover{
  border-color:var(--gold);
  color:var(--gold-lit);
  background:rgba(201,162,39,.1);
}
.btn--quiet{
  padding:0 0 3px;
  border:0;
  border-bottom:1px solid var(--gold-hair);
  color:var(--gold-lit);
  letter-spacing:.1em;
}
.btn--quiet:hover{border-bottom-color:var(--gold-lit)}

.tag{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:4px 9px;
  border:1px solid var(--hair-strong);
  font-family:var(--font-mono);
  font-size:10.5px;
  letter-spacing:.16em;
  line-height:1.4;
  text-transform:uppercase;
  color:var(--cool-soft);
}
.tag--gold{border-color:var(--gold-hair);color:var(--gold-lit);background:rgba(201,162,39,.12)}
.tag--amber{border-color:rgba(255,138,31,.55);color:var(--amber);background:rgba(255,138,31,.1)}
.tag--moss{border-color:rgba(79,122,90,.65);color:#8FBF9B;background:rgba(79,122,90,.14)}
.tag--brick{border-color:rgba(185,74,59,.65);color:#E0897C;background:rgba(185,74,59,.14)}

.breadcrumbs{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:0;
  font-family:var(--font-mono);
  font-size:11.5px;
  letter-spacing:.12em;
  color:var(--cool);
}
.breadcrumbs li{display:inline-flex;align-items:center}
.breadcrumbs li:not(:last-child)::after{
  content:"/";
  margin:0 9px;
  color:rgba(175,194,198,.45);
}
.breadcrumbs a{
  color:var(--cool-soft);
  border-bottom:1px solid transparent;
  transition:color .16s var(--ease),border-color .16s var(--ease);
}
.breadcrumbs a:hover{color:var(--gold-lit);border-bottom-color:var(--gold-hair)}
.breadcrumbs [aria-current="page"]{color:var(--gold-lit)}

/* 图片容器基础规则（页面阶段放入 <img alt="描述性文本">） */
.media-frame{
  position:relative;
  display:block;
  width:100%;
  overflow:hidden;
  background:var(--panel);
  border:1px solid var(--hair-strong);
}
.media-frame::after{
  content:"";
  position:absolute;
  inset:6px;
  border:1px solid rgba(175,194,198,.18);
  pointer-events:none;
}
.media-frame img{
  width:100%;
  height:100%;
  object-fit:cover;
}
.media-frame--wide{aspect-ratio:16 / 9}
.media-frame--square{aspect-ratio:1 / 1}
.media-frame--tall{aspect-ratio:4 / 5}
.media-caption{
  margin-top:10px;
  max-width:52ch;
  font-family:var(--font-mono);
  font-size:11.5px;
  letter-spacing:.08em;
  line-height:1.6;
  color:var(--cool);
}

/* ---------- 滚动显现 ---------- */
.js [data-reveal]{
  opacity:0;
  transform:translateY(14px);
  transition:opacity .55s var(--ease),transform .55s var(--ease);
  transition-delay:var(--reveal-delay,0ms);
  will-change:opacity,transform;
}
.js [data-reveal].is-revealed{
  opacity:1;
  transform:none;
  will-change:auto;
}

/* ============================================================
   响应式
   ============================================================ */
@media (max-width:1024px){
  .nav-link{padding:9px 9px;font-size:14px}
  .nav-num{display:none}
  .nav-link[aria-current="page"]::after{left:9px;right:9px}
}

@media (max-width:900px){
  .nav-toggle{display:inline-flex}
  .header-inner{padding:12px var(--gutter);gap:14px}
  .brand-mark{width:38px;height:38px;font-size:18px}
  .brand-name{font-size:19px}
  .brand-signature{font-size:9.5px;letter-spacing:.2em}

  .primary-nav{
    position:absolute;
    top:100%;
    left:0;
    right:0;
    display:block;
    padding:10px var(--gutter) 20px;
    background:var(--char);
    border-top:1px solid var(--hair);
    border-bottom:1px solid var(--hair-strong);
    box-shadow:0 26px 52px rgba(0,0,0,.6);
    max-height:calc(100vh - 96px);
    overflow-y:auto;
    opacity:0;
    visibility:hidden;
    transform:translateY(-10px);
    transition:opacity .22s var(--ease),transform .22s var(--ease),visibility .22s var(--ease);
  }
  .primary-nav[data-open="true"]{
    opacity:1;
    visibility:visible;
    transform:translateY(0);
  }

  .nav-list{flex-direction:column;align-items:stretch;gap:0}
  .nav-link{
    width:100%;
    justify-content:flex-start;
    padding:14px 4px;
    border:0;
    border-bottom:1px solid var(--hair);
    font-size:16px;
    color:var(--paper);
  }
  .nav-num{display:inline;font-size:10.5px;color:var(--cool)}
  .nav-link[aria-current="page"]{
    background:transparent;
    border-bottom-color:var(--gold-hair);
    color:var(--gold-lit);
  }
  .nav-link[aria-current="page"]::after{content:none}
  .nav-foot-note{
    display:block;
    margin-top:16px;
    max-width:none;
    font-family:var(--font-mono);
    font-size:11px;
    letter-spacing:.1em;
    color:var(--cool);
  }

  .footer-top .footer-shell{grid-template-columns:minmax(0,1fr)}
  .footer-contact-inner{grid-template-columns:minmax(0,1fr)}
  .grid--split,.grid--halves{grid-template-columns:minmax(0,1fr)}
}

@media (max-width:720px){
  .rail-inner{flex-wrap:wrap;gap:6px;padding:8px var(--gutter)}
  .rail-links{display:none}
  .rail-line{font-size:10.5px}
  .rail-update{font-size:10px;letter-spacing:.08em}
  .footer-nav{grid-template-columns:minmax(0,1fr)}
  .footer-base-inner{flex-direction:column;align-items:flex-start;gap:6px}
}

@media (max-width:420px){
  body{font-size:16px}
  .brand-signature{display:none}
  .nav-toggle-label{display:none}
  .nav-toggle{padding:10px 12px}
}

/* ---------- 动效偏好 ---------- */
@media (prefers-reduced-motion: reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
  }
  .js [data-reveal]{
    opacity:1;
    transform:none;
    transition:none;
  }
  .scroll-meter-fill{transition:none}
}