/* ==========================================================================
   百老汇牛牛 · 全站共享样式  /assets/site.css
   绒布墨绿 + 暗金 + 朱砂红 · 纵向叙事长卷 · 切角面板
   ========================================================================== */

/* ---------- reset ---------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{margin:0;min-height:100%}
img,svg{display:block;max-width:100%}
h1,h2,h3,h4,p,figure,blockquote{margin:0}
ul,ol{margin:0;padding:0;list-style:none}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;background:none;border:0;padding:0;cursor:pointer}
table{border-collapse:collapse;width:100%}
:focus-visible{outline:2px solid var(--gold-hi);outline-offset:3px;border-radius:2px}
::selection{background:rgba(201,162,39,.35);color:var(--cream)}

/* ---------- 变量 ---------- */
:root{
  --velvet:#0B2B24;
  --night:#061A16;
  --table:#10382E;
  --edge:#1E4A3C;
  --gold:#C9A227;
  --gold-hi:#E7C766;
  --cinnabar:#C0392B;
  --cream:#F3EDE0;
  --sand:#9FA79C;
  --ink:#04110E;

  --font-display:"Noto Serif SC","Source Han Serif SC","Source Han Serif CN","Songti SC","STSong",SimSun,serif;
  --font-body:"Noto Sans SC","Source Han Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,sans-serif;
  --font-mono:"JetBrains Mono","Roboto Mono","SFMono-Regular",Menlo,Consolas,"Courier New",monospace;

  --wrap:1240px;
  --read:720px;
  --gutter:clamp(18px,4vw,40px);
  --cut:14px;
  --ease:cubic-bezier(.2,.7,.2,1);
  --shadow:0 20px 44px -26px rgba(4,17,14,.95);
}

/* ---------- 基础排版 ---------- */
body{
  font-family:var(--font-body);
  font-size:17px;
  font-weight:400;
  line-height:1.85;
  color:var(--cream);
  background-color:var(--velvet);
  background-image:
    radial-gradient(1100px 520px at 50% -180px,rgba(201,162,39,.09),transparent 68%),
    radial-gradient(820px 640px at 100% 100%,rgba(6,26,22,.9),transparent 72%);
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
h1,h2,h3,h4{font-family:var(--font-display);font-weight:900;letter-spacing:-.02em;line-height:1.15;color:var(--cream)}
h1{font-size:clamp(38px,7vw,88px);line-height:1.05}
h2{font-size:clamp(26px,4vw,56px)}
h3{font-size:clamp(20px,2.4vw,32px);line-height:1.3}
strong{font-weight:700}
#main-content{display:block}
.visually-hidden{position:absolute !important;width:1px;height:1px;margin:-1px;padding:0;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0}
.mono{font-family:var(--font-mono);letter-spacing:.06em}
.mono--gold{font-family:var(--font-mono);letter-spacing:.06em;color:var(--gold)}
.cut{clip-path:polygon(var(--cut) 0,100% 0,100% calc(100% - var(--cut)),calc(100% - var(--cut)) 100%,0 100%,0 var(--cut))}

/* ---------- 跳转链接 ---------- */
.skip-link{
  position:absolute;left:16px;top:-120px;z-index:400;
  padding:10px 20px;background:var(--gold);color:var(--ink);
  font-family:var(--font-mono);font-size:13px;letter-spacing:.1em;font-weight:700;
  clip-path:polygon(8px 0,100% 0,100% calc(100% - 8px),calc(100% - 8px) 100%,0 100%,0 8px);
  transition:top .2s var(--ease);
}
.skip-link:focus{top:14px}

/* ---------- 布局容器 ---------- */
.wrap{width:min(calc(100% - var(--gutter) * 2),var(--wrap));margin-inline:auto}
.wrap--narrow{width:min(calc(100% - var(--gutter) * 2),900px);margin-inline:auto}
.section{padding:clamp(48px,7vw,96px) 0}
.prose{max-width:var(--read)}
.prose p{font-size:17px;line-height:1.85;color:rgba(243,237,224,.86)}
.prose p + p{margin-top:1em}
.prose h3{margin:34px 0 12px}
.band{background:linear-gradient(180deg,var(--velvet),var(--night));border-top:1px solid var(--edge);border-bottom:1px solid var(--edge)}

/* ---------- 网格 ---------- */
.grid{display:grid;gap:clamp(16px,2.4vw,28px)}
.grid--2{grid-template-columns:repeat(auto-fit,minmax(300px,1fr))}
.grid--3{grid-template-columns:repeat(auto-fit,minmax(240px,1fr))}
.grid--4{grid-template-columns:repeat(auto-fit,minmax(190px,1fr))}

/* ---------- 章节（纵向叙事节拍器） ---------- */
.chapter{position:relative;padding:clamp(52px,8vw,104px) 0}
.chapter + .chapter{border-top:1px solid var(--edge)}
.chapter-head{display:flex;flex-wrap:wrap;align-items:baseline;gap:clamp(12px,2vw,22px);margin-bottom:clamp(20px,3vw,34px)}
.chapter-num{font-family:var(--font-mono);font-size:14px;letter-spacing:.14em;color:var(--sand);transition:color .3s var(--ease)}
.chapter.is-active .chapter-num{color:var(--gold-hi)}
.chapter-title{font-size:clamp(26px,3.6vw,44px);margin:0}
.chapter-lede{max-width:var(--read);font-size:clamp(16px,1.4vw,18px);color:rgba(243,237,224,.78)}

/* ---------- 卡片 / 标签 / 折叠面板 ---------- */
.card{position:relative;background:var(--table);border:1px solid var(--edge);padding:clamp(18px,2.4vw,26px);box-shadow:var(--shadow);transition:border-color .24s var(--ease),transform .24s var(--ease)}
.card--cut{clip-path:polygon(var(--cut) 0,100% 0,100% calc(100% - var(--cut)),calc(100% - var(--cut)) 100%,0 100%,0 var(--cut))}
.card:hover{border-color:rgba(201,162,39,.55)}
.card-title{font-family:var(--font-display);font-weight:900;font-size:20px;line-height:1.35;margin:0 0 8px}
.card-text{font-size:15px;line-height:1.8;color:rgba(243,237,224,.8)}
.card-meta{margin-top:14px;font-family:var(--font-mono);font-size:12px;letter-spacing:.08em;color:var(--sand)}

.tag{display:inline-flex;align-items:center;gap:6px;padding:5px 10px;border:1px solid var(--edge);font-family:var(--font-mono);font-size:11px;letter-spacing:.14em;color:var(--sand);text-transform:uppercase}
.tag--gold{border-color:rgba(201,162,39,.6);background:rgba(201,162,39,.08);color:var(--gold-hi)}
.tag--update{border-color:rgba(192,57,43,.8);background:rgba(192,57,43,.18);color:var(--cream)}

.disclosure{border:1px solid var(--edge);background:var(--table);margin-bottom:10px}
.disclosure-btn{width:100%;display:flex;align-items:center;justify-content:space-between;gap:16px;padding:16px 18px;text-align:left;font-size:16px;line-height:1.6;color:var(--cream);transition:color .2s var(--ease),background .2s var(--ease)}
.disclosure-btn:hover{color:var(--gold-hi);background:rgba(30,74,60,.45)}
.disclosure-sign{flex:none;font-family:var(--font-mono);font-size:15px;color:var(--gold);transition:transform .28s var(--ease)}
.disclosure-btn[aria-expanded="true"] .disclosure-sign{transform:rotate(45deg)}
.disclosure-panel{padding:0 18px 18px;font-size:15px;line-height:1.85;color:rgba(243,237,224,.82)}
.disclosure-panel[hidden]{display:none}

/* ---------- 按钮 ---------- */
.btn{
  display:inline-flex;align-items:center;gap:10px;
  padding:13px 26px;border:1px solid var(--edge);background:var(--table);color:var(--cream);
  font-size:15px;letter-spacing:.08em;line-height:1.4;
  clip-path:polygon(10px 0,100% 0,100% calc(100% - 10px),calc(100% - 10px) 100%,0 100%,0 10px);
  transition:color .22s var(--ease),border-color .22s var(--ease),background .22s var(--ease),transform .22s var(--ease);
}
.btn:hover{color:var(--gold-hi);border-color:var(--gold);transform:translateY(-1px)}
.btn--gold{background:linear-gradient(180deg,var(--gold-hi),var(--gold));border-color:var(--gold-hi);color:var(--ink);font-weight:700}
.btn--gold:hover{color:var(--ink);box-shadow:0 10px 26px -14px rgba(201,162,39,.9)}
.btn--ghost{background:transparent;border-color:var(--gold);color:var(--gold-hi)}
.btn--small{padding:9px 18px;font-size:13px;letter-spacing:.1em}

/* ---------- 面包屑 ---------- */
.breadcrumb{margin:0 0 22px}
.breadcrumb-list{display:flex;flex-wrap:wrap;align-items:center;gap:8px;font-family:var(--font-mono);font-size:12px;letter-spacing:.06em;color:var(--sand)}
.breadcrumb-item{display:flex;align-items:center}
.breadcrumb-item + .breadcrumb-item::before{content:"/";margin-right:8px;color:var(--edge)}
.breadcrumb-link{transition:color .2s var(--ease)}
.breadcrumb-link:hover{color:var(--gold-hi)}
.breadcrumb-current{color:var(--gold)}

/* ---------- 图片容器（页面阶段放 <img>） ---------- */
.media{position:relative;display:block;width:100%;overflow:hidden;background:var(--night);border:1px solid var(--edge)}
.media::after{content:"";position:absolute;inset:0;pointer-events:none;background:radial-gradient(120% 92% at 50% 8%,rgba(4,17,14,0) 38%,rgba(4,17,14,.74) 100%)}
.media img{width:100%;height:100%;object-fit:cover;filter:saturate(.88) contrast(1.06) brightness(.92)}
.media--4x3{aspect-ratio:4 / 3}
.media--16x9{aspect-ratio:16 / 9}
.media--1x1{aspect-ratio:1 / 1}
.media--card{aspect-ratio:5 / 7}
.media-caption{margin-top:10px;font-size:13px;line-height:1.7;color:var(--sand)}

/* ---------- 刊头 ---------- */
.site-header{
  position:relative;isolation:isolate;
  background:linear-gradient(180deg,#0D332A 0%,#0B2B24 62%,#08211C 100%);
  border-bottom:1px solid var(--edge);
}
.site-header::after{
  content:"";position:absolute;left:0;right:0;bottom:-1px;height:1px;
  background:linear-gradient(90deg,transparent,rgba(201,162,39,.75),transparent);
}
.header-halo{
  position:absolute;inset:0;z-index:-1;pointer-events:none;
  background:radial-gradient(620px 220px at 50% -40px,rgba(231,199,102,.14),transparent 70%);
}
.header-inner{
  display:grid;
  grid-template-columns:minmax(0,1fr) auto minmax(0,1fr);
  grid-template-areas:
    "start brand end"
    "nav nav nav";
  align-items:center;
  column-gap:18px;
  padding:clamp(18px,3vw,30px) 0 0;
}
.masthead-eyebrow{
  grid-area:start;justify-self:start;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.16em;line-height:1.7;
  color:var(--sand);text-transform:uppercase;
}
.brand{
  grid-area:brand;justify-self:center;
  display:inline-flex;flex-direction:column;align-items:center;gap:5px;
  padding:2px 6px;text-align:center;
}
.brand-mark{width:9px;height:9px;background:var(--gold);transform:rotate(45deg);box-shadow:0 0 0 4px rgba(201,162,39,.14)}
.brand-name{font-family:var(--font-display);font-weight:900;font-size:clamp(26px,4.6vw,44px);line-height:1.06;letter-spacing:.05em;color:var(--cream);transition:color .22s var(--ease)}
.brand-sub{font-family:var(--font-mono);font-size:10px;letter-spacing:.34em;color:var(--sand);text-transform:uppercase}
.brand:hover .brand-name{color:var(--gold-hi)}

.header-side{grid-area:end;justify-self:end;display:flex;flex-direction:column;align-items:flex-end;gap:10px;text-align:right}
.status-badge{
  display:inline-flex;align-items:center;gap:8px;padding:6px 12px;
  border:1px solid var(--edge);background:rgba(16,56,46,.65);
  font-family:var(--font-mono);font-size:12px;letter-spacing:.06em;color:var(--cream);
  clip-path:polygon(8px 0,100% 0,100% calc(100% - 8px),calc(100% - 8px) 100%,0 100%,0 8px);
}
.status-dot{flex:none;width:7px;height:7px;border-radius:50%;background:var(--cinnabar);box-shadow:0 0 8px rgba(192,57,43,.9)}
.quick-actions{display:flex;flex-wrap:wrap;justify-content:flex-end;gap:8px 16px}
.quick-item{display:flex}
.quick-link{
  font-size:14px;letter-spacing:.08em;color:var(--cream);opacity:.86;
  padding-bottom:2px;border-bottom:1px solid rgba(201,162,39,.4);
  transition:color .2s var(--ease),opacity .2s var(--ease),border-color .2s var(--ease);
}
.quick-link:hover{color:var(--gold-hi);opacity:1;border-color:var(--gold-hi)}

.nav-toggle{
  grid-area:toggle;display:none;align-items:center;gap:10px;
  padding:10px 14px;border:1px solid var(--edge);background:rgba(16,56,46,.7);
  font-family:var(--font-mono);font-size:12px;letter-spacing:.14em;color:var(--cream);
  clip-path:polygon(8px 0,100% 0,100% calc(100% - 8px),calc(100% - 8px) 100%,0 100%,0 8px);
  transition:color .2s var(--ease),border-color .2s var(--ease);
}
.nav-toggle:hover,.nav-toggle[aria-expanded="true"]{color:var(--gold-hi);border-color:var(--gold)}
.nav-toggle-bars{display:inline-flex;flex-direction:column;gap:3px;width:16px}
.nav-toggle-bars span{display:block;height:1px;background:currentColor}
.nav-toggle-text{white-space:nowrap}

.site-nav{
  grid-area:nav;width:100%;
  border-top:1px solid var(--edge);
  margin-top:clamp(16px,2.4vw,24px);
  padding:6px 0 10px;
}
.nav-list{display:flex;flex-wrap:wrap;align-items:center;justify-content:center}
.nav-item{display:flex;align-items:center}
.nav-item + .nav-item::before{content:"";width:5px;height:5px;background:var(--gold);opacity:.45;transform:rotate(45deg)}
.nav-link{
  position:relative;display:block;padding:9px 16px;
  font-size:15px;letter-spacing:.14em;line-height:1.5;color:var(--cream);opacity:.8;
  transition:color .2s var(--ease),opacity .2s var(--ease);
}
.nav-link::after{
  content:"";position:absolute;left:16px;right:16px;bottom:3px;height:1px;
  background:var(--gold);transform:scaleX(0);transform-origin:left center;
  transition:transform .28s var(--ease);
}
.nav-link:hover,.nav-link:focus-visible{color:var(--gold-hi);opacity:1}
.nav-link:hover::after,.nav-link:focus-visible::after{transform:scaleX(1)}
.nav-link[aria-current="page"]{color:var(--gold);opacity:1}
.nav-link[aria-current="page"]::after{transform:scaleX(1)}

/* ---------- 页脚 ---------- */
.site-footer{
  position:relative;margin-top:clamp(60px,8vw,120px);
  background:linear-gradient(180deg,var(--night),#041310 72%);
  border-top:1px solid var(--edge);
  color:var(--cream);
}
.footer-rule{height:2px;background:linear-gradient(90deg,transparent,rgba(201,162,39,.8) 20%,rgba(231,199,102,.9) 50%,rgba(201,162,39,.8) 80%,transparent)}
.footer-inner{
  display:grid;gap:clamp(28px,4vw,48px);
  grid-template-columns:minmax(220px,1.1fr) minmax(0,2fr) minmax(250px,1.4fr);
  padding:clamp(40px,6vw,72px) 0 clamp(28px,4vw,48px);
}
.footer-brand{display:flex;flex-direction:column;align-items:flex-start}
.brand--footer{justify-self:start;align-items:flex-start;text-align:left;padding:0}
.brand--footer .brand-name{font-size:clamp(22px,2.6vw,30px)}
.footer-tagline{margin-top:16px;max-width:34ch;font-size:15px;line-height:1.8;color:var(--sand)}
.footer-cols{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:24px}
.footer-col-title{
  margin:0 0 14px;font-family:var(--font-mono);font-weight:500;
  font-size:12px;letter-spacing:.2em;line-height:1.6;color:var(--gold);text-transform:uppercase;
}
.footer-list li + li{margin-top:10px}
.footer-link{
  font-size:15px;line-height:1.7;color:rgba(243,237,224,.82);
  padding-bottom:1px;border-bottom:1px solid transparent;
  transition:color .2s var(--ease),border-color .2s var(--ease);
}
.footer-link:hover{color:var(--gold-hi);border-color:var(--gold)}
.contact-list li + li{margin-top:12px}
.contact-item{display:flex;flex-wrap:wrap;align-items:center;gap:8px 10px}
.contact-label{min-width:56px;font-family:var(--font-mono);font-size:11px;letter-spacing:.16em;color:var(--sand)}
.contact-value{font-family:var(--font-mono);font-size:14px;letter-spacing:.04em;color:var(--cream);word-break:break-word}
.contact-item--wide .contact-value{font-family:var(--font-body);font-size:14px;line-height:1.7}
.copy-btn{
  flex:none;padding:3px 9px;border:1px solid var(--edge);
  font-family:var(--font-mono);font-size:11px;letter-spacing:.1em;color:var(--gold);
  clip-path:polygon(6px 0,100% 0,100% calc(100% - 6px),calc(100% - 6px) 100%,0 100%,0 6px);
  transition:color .2s var(--ease),border-color .2s var(--ease),background .2s var(--ease);
}
.copy-btn:hover{color:var(--gold-hi);border-color:var(--gold)}
.copy-btn[data-copied]{color:var(--cream);border-color:var(--gold-hi);background:rgba(201,162,39,.18)}
.contact-note{margin-top:14px;max-width:40ch;font-size:13px;line-height:1.7;color:var(--sand)}
.footer-bottom{border-top:1px solid var(--edge);background:rgba(4,17,14,.5)}
.footer-bottom-inner{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:10px 24px;padding:18px 0}
.footer-copy,.footer-icp{font-family:var(--font-mono);font-size:12px;letter-spacing:.08em;line-height:1.7;color:var(--sand)}

/* ---------- 阅读进度 / 回到顶部（由 JS 注入） ---------- */
.read-progress{
  position:fixed;top:0;left:0;right:0;height:3px;z-index:300;pointer-events:none;
  background:rgba(231,199,102,.08);
}
.read-progress-bar{
  display:block;width:0;height:100%;
  background:linear-gradient(90deg,var(--gold),var(--gold-hi));
  box-shadow:0 0 12px rgba(201,162,39,.55);
  transition:width .09s linear;
}
.to-top{
  position:fixed;right:clamp(14px,3vw,32px);bottom:clamp(14px,3vw,32px);z-index:280;
  display:none;place-items:center;width:52px;height:52px;
  background:var(--table);border:1px solid var(--gold);color:var(--gold);
  font-family:var(--font-mono);font-size:11px;letter-spacing:.06em;line-height:1.3;text-align:center;
  clip-path:polygon(9px 0,100% 0,100% calc(100% - 9px),calc(100% - 9px) 100%,0 100%,0 9px);
  transition:color .2s var(--ease),background .2s var(--ease),transform .2s var(--ease);
}
.to-top[data-visible]{display:grid}
.to-top:hover{color:var(--ink);background:var(--gold-hi);transform:translateY(-2px)}

/* ---------- 入场与章节状态 ---------- */
[data-reveal]{opacity:0;transform:translateY(12px);transition:opacity .32s var(--ease),transform .32s var(--ease)}
[data-reveal].is-visible{opacity:1;transform:translateY(0)}

/* ---------- 平板 ---------- */
@media (max-width:1080px){
  .footer-inner{grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:32px}
  .footer-brand{grid-column:1 / -1}
  .footer-contact{grid-column:1 / -1}
}

/* ---------- 手机 ---------- */
@media (max-width:900px){
  .header-inner{
    grid-template-columns:minmax(0,1fr) auto;
    grid-template-areas:
      "brand toggle"
      "start start"
      "end end"
      "nav nav";
    row-gap:2px;
    padding-top:16px;
  }
  .brand{justify-self:start;align-items:flex-start;text-align:left}
  .masthead-eyebrow{margin-top:12px;justify-self:start}
  .header-side{justify-self:stretch;align-items:flex-start;text-align:left;margin-top:12px}
  .quick-actions{justify-content:flex-start}
  .nav-toggle{display:inline-flex;justify-self:end;align-self:start}
  .site-nav{display:none;margin-top:14px;padding:0 0 8px}
  .site-nav[data-open]{display:block;animation:navDrop .3s var(--ease) both}
  .nav-list{flex-direction:column;align-items:stretch}
  .nav-item + .nav-item::before{display:none}
  .nav-link{padding:14px 2px;font-size:16px;letter-spacing:.08em;border-bottom:1px solid var(--edge)}
  .nav-link::after{display:none}
  .site-nav[data-open] .nav-item:last-child .nav-link{border-bottom:0}
  .footer-cols{grid-template-columns:repeat(2,minmax(0,1fr))}
  .chapter-head{gap:12px}
}
@keyframes navDrop{from{opacity:0;transform:translateY(-6px)}to{opacity:1;transform:translateY(0)}}

@media (max-width:560px){
  body{font-size:16px}
  .quick-actions{gap:8px 14px}
  .footer-cols{grid-template-columns:minmax(0,1fr)}
  .grid--2,.grid--3,.grid--4{grid-template-columns:minmax(0,1fr)}
  .to-top{width:46px;height:46px}
}

/* ---------- 动效克制 ---------- */
@media (prefers-reduced-motion: reduce){
  html{scroll-behavior:auto}
  .site-nav[data-open]{animation:none}
  .nav-link::after{transition:none}
  .btn:hover,.to-top:hover{transform:none}
  [data-reveal]{transform:none;transition:opacity .2s linear}
  [data-reveal].is-visible{transform:none}
  .read-progress-bar{transition:none}
}

/* ---------- 打印 ---------- */
@media print{
  .site-header,.site-footer,.read-progress,.to-top{display:none !important}
  body{background:#fff;color:#111}
  .card,.disclosure{border-color:#999;background:#fff;box-shadow:none}
  [data-reveal]{opacity:1;transform:none}
}