/* ==========================================================
   竞博中文站 · /assets/site.css
   共享外壳：reset / 变量 / 中文排版 / 头部轨道 / 页脚 / 通用组件
   ========================================================== */

/* ---------- 01 设计变量 ---------- */
:root{
  --indigo:#101A33;
  --char:#0B0D12;
  --night:#1B2740;
  --paper:#F5F3ED;
  --ink:#3A4356;
  --frost:#8C97AB;
  --orange:#FF6A2B;
  --cyan:#35D6C8;
  --mist:#DDE3EC;
  --amber:#FFB43A;

  --line:rgba(221,227,236,.14);
  --line-strong:rgba(221,227,236,.32);
  --line-ink:rgba(11,13,18,.14);

  --rail-w:72px;
  --maxw:1200px;
  --topbar-h:72px;
  --shadow-1:0 1px 2px rgba(11,13,18,.18);
  --ease:cubic-bezier(.2,.7,.2,1);

  --font-sans:"Source Han Sans SC","Noto Sans SC","HarmonyOS Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,sans-serif;
  --font-mono:"JetBrains Mono","IBM Plex Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,"Courier New",monospace;
}

/* ---------- 02 Reset 与中文排版 ---------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;text-size-adjust:100%}
body{
  margin:0;
  background:var(--indigo);
  color:var(--mist);
  font-family:var(--font-sans);
  font-size:17px;
  line-height:1.75;
  letter-spacing:.01em;
  -webkit-font-smoothing:antialiased;
  -moz-osx-font-smoothing:grayscale;
}
h1,h2,h3,h4,h5,h6{margin:0;font-weight:900;line-height:1.25;letter-spacing:-.015em;color:var(--paper)}
p{margin:0}
ul,ol{margin:0;padding:0;list-style:none}
dl,dt,dd{margin:0}
img,svg,video{display:block;max-width:100%}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
[hidden]{display:none!important}
:focus-visible{outline:2px solid var(--cyan);outline-offset:3px;border-radius:2px}
::selection{background:var(--orange);color:var(--char)}
strong{font-weight:900;color:var(--paper)}
.mono{font-family:var(--font-mono);font-variant-numeric:tabular-nums}

/* ---------- 03 布局基元 ---------- */
main{display:block}
#main-content{scroll-margin-top:calc(var(--topbar-h) + 16px)}
.wrap{width:100%;max-width:var(--maxw);margin-inline:auto;padding-inline:24px}
.section{padding-block:clamp(56px,8vw,104px);position:relative}
.section--tight{padding-block:clamp(32px,4vw,56px)}
.rail-offset{margin-left:0}
.stack>*+*{margin-top:16px}
.grid{display:grid;gap:24px}
.grid--2{grid-template-columns:repeat(2,minmax(0,1fr))}
.grid--3{grid-template-columns:repeat(3,minmax(0,1fr))}
.grid--4{grid-template-columns:repeat(4,minmax(0,1fr))}

/* ---------- 04 跳转链接 ---------- */
.skip-link{
  position:fixed;top:10px;left:10px;z-index:300;
  padding:10px 18px;
  background:var(--orange);color:var(--char);
  font-weight:900;font-size:14px;letter-spacing:.06em;
  border-radius:2px;
  transform:translateY(-180%);
  transition:transform .2s var(--ease);
}
.skip-link:focus{transform:translateY(0)}

/* ---------- 05 头部外壳 ---------- */
.site-header{position:sticky;top:0;z-index:60}
.topbar{
  background:rgba(16,26,51,.9);
  -webkit-backdrop-filter:blur(12px);
  backdrop-filter:blur(12px);
  border-bottom:1px solid var(--line);
}
.topbar-inner{
  display:flex;
  align-items:center;
  gap:16px;
  width:100%;
  max-width:var(--maxw);
  margin-inline:auto;
  padding:12px 24px;
  min-height:var(--topbar-h);
}
.brand{display:flex;flex-direction:column;gap:1px;min-width:0}
.brand-name{
  font-size:20px;font-weight:900;line-height:1.15;
  letter-spacing:.04em;color:var(--paper);
}
.brand-line{
  font-family:var(--font-mono);
  font-size:10px;line-height:1.4;
  letter-spacing:.26em;
  color:var(--cyan);
}
.topbar-tools{display:flex;align-items:center;gap:10px;margin-left:auto}
.lookup{
  display:inline-flex;align-items:center;gap:9px;
  padding:9px 14px;
  border:1px solid var(--line-strong);
  border-radius:2px;
  font-size:14px;letter-spacing:.04em;
  color:var(--mist);
  transition:border-color .2s var(--ease),color .2s var(--ease);
}
.lookup:hover{border-color:var(--cyan);color:var(--paper)}
.lookup-dot{
  width:6px;height:6px;flex:none;border-radius:50%;
  background:var(--cyan);
  box-shadow:0 0 0 3px rgba(53,214,200,.16);
}
.lookup-short{display:none}

/* ---------- 06 移动抽屉开关 ---------- */
.nav-toggle{
  display:none;
  align-items:center;gap:10px;
  padding:9px 12px;
  border:1px solid var(--line-strong);
  border-radius:2px;
  font-family:var(--font-mono);
  font-size:12px;letter-spacing:.18em;
  color:var(--paper);
  transition:border-color .2s var(--ease),background .2s var(--ease);
}
.nav-toggle:hover{border-color:var(--cyan)}
.nav-toggle-bars{display:flex;flex-direction:column;gap:4px;width:16px}
.nav-toggle-bars i{display:block;height:1px;width:100%;background:var(--orange)}
.nav-toggle[aria-expanded="true"]{background:var(--night);border-color:var(--orange)}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars i:nth-child(2){opacity:0}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars i:nth-child(1){transform:translateY(5px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars i:nth-child(3){transform:translateY(-5px) rotate(-45deg)}

/* ---------- 07 侧边轨道导航 ---------- */
.rail{
  position:fixed;top:0;left:0;bottom:0;width:var(--rail-w);z-index:80;
  display:flex;flex-direction:column;align-items:center;
  padding:16px 0 18px;
  background:var(--char);
  border-right:1px solid var(--line);
}
.rail-head{
  display:flex;flex-direction:column;align-items:center;gap:8px;
  width:100%;padding:0 10px 12px;
}
.rail-mark{display:flex;flex-direction:column;align-items:center;gap:8px}
.mark-glyph{
  display:grid;place-items:center;
  width:38px;height:38px;flex:none;
  background:var(--orange);color:var(--char);
  font-size:19px;font-weight:900;line-height:1;
  border-radius:2px;
}
.rail-mark-line{
  font-family:var(--font-mono);
  font-size:9px;letter-spacing:.2em;
  color:var(--frost);
  writing-mode:vertical-rl;text-orientation:upright;
  display:none;
}
.rail-close{display:none}
.rail-list{
  display:flex;flex-direction:column;
  width:100%;min-height:0;flex:1 1 auto;
  overflow-y:auto;overscroll-behavior:contain;
  margin-top:14px;
}
.rail-list li{width:100%}
.rail-link{
  position:relative;
  display:flex;flex-direction:column;align-items:center;gap:7px;
  padding:11px 4px;
  color:var(--frost);
  transition:color .2s var(--ease),background .2s var(--ease);
}
.rail-link::before{
  content:"";position:absolute;left:0;top:50%;
  width:2px;height:0;background:var(--orange);
  transform:translateY(-50%);
  transition:height .24s var(--ease);
}
.rail-idx{
  font-family:var(--font-mono);font-size:10px;
  letter-spacing:.08em;opacity:.65;
}
.rail-label{
  writing-mode:vertical-rl;text-orientation:upright;
  font-size:13px;font-weight:500;letter-spacing:.18em;
}
.rail-link:hover{color:var(--paper)}
.rail-link:hover::before{height:16px}
.rail-link[aria-current="page"]{color:var(--paper);background:rgba(53,214,200,.06)}
.rail-link[aria-current="page"]::before{height:28px;background:var(--orange)}
.rail-link[aria-current="page"] .rail-idx{color:var(--orange);opacity:1}

.rail-actions{display:none}
.rail-foot{
  display:flex;flex-direction:column;align-items:center;gap:12px;
  width:100%;padding-top:14px;margin-top:12px;
  border-top:1px solid var(--line);
}
.rail-progress{
  position:relative;display:block;
  width:2px;height:64px;
  background:rgba(221,227,236,.16);
  overflow:hidden;
}
.rail-progress-fill{
  position:absolute;left:0;top:0;width:100%;height:0;
  background:var(--cyan);
}
.rail-top{
  display:grid;place-items:center;
  width:32px;height:32px;
  border:1px solid var(--line-strong);border-radius:2px;
  color:var(--frost);font-family:var(--font-mono);font-size:14px;
  transition:border-color .2s var(--ease),color .2s var(--ease);
}
.rail-top:hover{border-color:var(--orange);color:var(--orange)}

/* ---------- 08 抽屉遮罩 ---------- */
.nav-scrim{
  position:fixed;inset:0;z-index:70;
  background:rgba(11,13,18,.7);
  opacity:0;visibility:hidden;
  transition:opacity .28s var(--ease),visibility .28s var(--ease);
}
.rail[data-open="true"]+.nav-scrim{opacity:1;visibility:visible}

/* ---------- 09 页脚 ---------- */
.site-footer{
  position:relative;
  background:var(--char);
  color:var(--frost);
  border-top:1px solid var(--line);
  padding-block:0 clamp(28px,4vw,44px);
}
.site-footer::before{
  content:"";display:block;height:6px;
  background-image:repeating-linear-gradient(90deg,var(--line-strong) 0 1px,transparent 1px 24px);
  background-repeat:repeat-x;
}
.footer-inner{
  width:100%;max-width:var(--maxw);
  margin-inline:auto;
  padding:clamp(40px,6vw,72px) 24px 0;
}
.footer-top{
  display:grid;
  grid-template-columns:minmax(0,1fr) minmax(0,2fr);
  gap:clamp(28px,5vw,64px);
  padding-bottom:clamp(28px,4vw,48px);
  border-bottom:1px solid var(--line);
}
.footer-brand{display:flex;flex-direction:column;gap:12px;max-width:320px}
.footer-mark{display:flex;align-items:center;gap:12px}
.footer-name{font-size:20px;font-weight:900;letter-spacing:.04em;color:var(--paper)}
.footer-line{
  font-family:var(--font-mono);font-size:11px;
  letter-spacing:.24em;color:var(--cyan);
}
.footer-note{font-size:14px;line-height:1.8;color:var(--frost)}
.footer-cols{
  display:grid;
  grid-template-columns:repeat(3,minmax(0,1fr));
  gap:24px;
}
.footer-col-title{
  display:flex;align-items:baseline;gap:8px;
  font-size:15px;font-weight:900;letter-spacing:.06em;
  color:var(--paper);
  margin-bottom:14px;
}
.footer-col-idx{
  font-family:var(--font-mono);font-size:11px;
  font-weight:400;letter-spacing:.1em;color:var(--orange);
}
.footer-list{display:flex;flex-direction:column;gap:9px}
.footer-list a{
  font-size:14px;color:var(--frost);
  border-bottom:1px solid transparent;
  transition:color .2s var(--ease),border-color .2s var(--ease);
}
.footer-list a:hover{color:var(--cyan);border-bottom-color:var(--cyan)}
.footer-contact{
  padding:clamp(28px,4vw,44px) 0;
  border-bottom:1px solid var(--line);
}
.footer-dl{display:grid;gap:10px;max-width:760px}
.footer-dl-row{display:grid;grid-template-columns:72px minmax(0,1fr);gap:12px;align-items:baseline}
.footer-dl-row dt{
  font-family:var(--font-mono);font-size:12px;
  letter-spacing:.16em;color:var(--frost);
}
.footer-dl-row dd{font-size:14px;color:var(--mist);word-break:break-all}
.footer-hours{margin-top:16px;font-size:13px;line-height:1.8;color:var(--frost);max-width:640px}
.footer-bottom{
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;
  gap:14px;padding-top:24px;
}
.footer-copy{font-family:var(--font-mono);font-size:12px;letter-spacing:.08em;color:var(--frost)}
.footer-legal{display:flex;flex-wrap:wrap;gap:18px}
.footer-legal a{
  font-size:13px;color:var(--frost);
  transition:color .2s var(--ease);
}
.footer-legal a:hover{color:var(--cyan)}

/* ---------- 10 通用按钮 ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:10px 18px;
  font-size:14px;font-weight:700;letter-spacing:.06em;
  border:1px solid transparent;border-radius:2px;
  transition:background .2s var(--ease),color .2s var(--ease),border-color .2s var(--ease);
}
.btn-signal{background:var(--orange);border-color:var(--orange);color:var(--char)}
.btn-signal:hover{background:var(--amber);border-color:var(--amber)}
.btn-line{background:transparent;border-color:var(--line-strong);color:var(--paper)}
.btn-line:hover{border-color:var(--cyan);color:var(--cyan)}
.btn-quiet{background:var(--night);border-color:var(--line);color:var(--mist)}
.btn-quiet:hover{border-color:var(--cyan);color:var(--paper)}

/* ---------- 11 标签与筛选 ---------- */
.tag{
  display:inline-flex;align-items:center;gap:6px;
  padding:4px 10px;
  border:1px solid var(--line-strong);border-radius:2px;
  font-family:var(--font-mono);font-size:11px;
  letter-spacing:.14em;color:var(--frost);
}
.tag--signal{color:var(--orange);border-color:rgba(255,106,43,.5)}
.tag--cyan{color:var(--cyan);border-color:rgba(53,214,200,.5)}
.filters{display:flex;flex-wrap:wrap;align-items:center;gap:10px}
.filter-btn{
  padding:8px 16px;
  border:1px solid var(--line-strong);border-radius:999px;
  font-size:13px;letter-spacing:.06em;color:var(--frost);
  transition:background .18s var(--ease),color .18s var(--ease),border-color .18s var(--ease);
}
.filter-btn:hover{border-color:var(--cyan);color:var(--paper)}
.filter-btn[aria-pressed="true"]{background:var(--orange);border-color:var(--orange);color:var(--char);font-weight:700}
.filter-count{font-family:var(--font-mono);font-size:12px;letter-spacing:.14em;color:var(--frost)}
@keyframes filterIn{from{opacity:0}to{opacity:1}}
[data-filtered="true"] [data-filter-item]:not([hidden]){animation:filterIn .18s var(--ease) both}

/* ---------- 12 面板、框景、编号章节 ---------- */
.panel{
  position:relative;
  padding:clamp(24px,4vw,48px);
  border:1px solid var(--line-ink);
  box-shadow:var(--shadow-1);
}
.panel--paper{background:var(--paper);color:var(--ink)}
.panel--paper h1,.panel--paper h2,.panel--paper h3{color:var(--char)}
.panel--night{background:var(--night);color:var(--mist);border-color:var(--line)}
.panel--deep{background:var(--indigo);color:var(--mist);border-color:var(--line)}

.frame{position:relative;border:1px solid var(--line-strong);padding:clamp(24px,4vw,48px)}
.frame::before,.frame::after{
  content:"";position:absolute;width:14px;height:14px;pointer-events:none;
}
.frame::before{top:-1px;left:-1px;border-top:2px solid var(--cyan);border-left:2px solid var(--cyan)}
.frame::after{bottom:-1px;right:-1px;border-bottom:2px solid var(--cyan);border-right:2px solid var(--cyan)}

.eyebrow{
  display:block;
  font-family:var(--font-mono);font-size:12px;
  letter-spacing:.3em;color:var(--orange);
}
.chapter{display:block;font-family:var(--font-mono);font-size:12px;letter-spacing:.28em;color:var(--cyan)}
.chapter-num{
  display:block;
  font-family:var(--font-mono);
  font-size:clamp(40px,7vw,76px);
  font-weight:700;line-height:1;
  letter-spacing:-.02em;
  color:var(--orange);
}
.chapter-title{font-size:clamp(26px,4vw,40px);font-weight:900;color:var(--paper)}
.panel--paper .chapter-title{color:var(--char)}
.chapter-head{display:flex;align-items:flex-end;gap:20px;flex-wrap:wrap;margin-bottom:24px}
.annotation{
  writing-mode:vertical-rl;text-orientation:upright;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.3em;
  color:var(--frost);
}

/* ---------- 13 卡片、正文、面包屑 ---------- */
.card{
  background:var(--paper);color:var(--ink);
  border:1px solid var(--line-ink);
  box-shadow:var(--shadow-1);
  padding:22px;
}
.card h3{color:var(--char);font-size:19px;margin-bottom:8px}
.card p{font-size:15px;line-height:1.8}
.card--night{background:var(--night);color:var(--mist);border-color:var(--line)}
.card--night h3{color:var(--paper)}

.prose{max-width:720px;font-size:17px;line-height:1.85}
.prose h2{font-size:clamp(22px,3vw,30px);margin:1.8em 0 .6em}
.prose h3{font-size:clamp(18px,2.2vw,22px);margin:1.6em 0 .5em}
.prose p{margin:0 0 1.1em}
.prose ul,.prose ol{margin:0 0 1.2em;padding-left:1.3em;list-style:disc}
.prose ol{list-style:decimal}
.prose li{margin:.35em 0}
.prose a{color:var(--cyan);text-decoration:underline;text-underline-offset:3px}

.breadcrumb{
  display:flex;flex-wrap:wrap;align-items:center;gap:8px;
  padding:20px 0;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.12em;
  color:var(--frost);
}
.breadcrumb a{color:var(--frost);transition:color .2s var(--ease)}
.breadcrumb a:hover{color:var(--cyan)}
.breadcrumb-sep{color:rgba(140,151,171,.5)}
.breadcrumb [aria-current="page"]{color:var(--paper)}

/* ---------- 14 图片占位容器 ---------- */
.media{
  position:relative;width:100%;aspect-ratio:16/9;
  overflow:hidden;
  background:linear-gradient(135deg,var(--night) 0%,var(--char) 100%);
  border:1px solid var(--line);
}
.media img{width:100%;height:100%;object-fit:cover}
.media--wide{aspect-ratio:21/9}
.media--square{aspect-ratio:1/1}
.media--portrait{aspect-ratio:3/4}
.media-caption{
  display:block;margin-top:10px;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.1em;
  color:var(--frost);
}

/* ---------- 15 出现动效 ---------- */
.reveal{opacity:1;transform:none}
html[data-reveal="ready"] .reveal:not(.is-in){
  opacity:0;transform:translateY(16px);
  transition:opacity .32s var(--ease),transform .32s var(--ease);
}
html[data-reveal="ready"] .reveal.is-in{
  opacity:1;transform:none;
  transition:opacity .32s var(--ease),transform .32s var(--ease);
}

/* ---------- 16 桌面端 ---------- */
@media (min-width:1025px){
  .site-header{margin-left:var(--rail-w)}
  main{margin-left:var(--rail-w)}
  .site-footer{padding-left:var(--rail-w)}
  .topbar-tools{gap:12px}
}

/* ---------- 17 平板 / 移动端抽屉 ---------- */
@media (max-width:1024px){
  .nav-toggle{display:inline-flex;order:-1}
  .topbar-inner{padding:10px 20px;gap:12px}
  .topbar-tools .btn{display:none}
  .lookup-text{display:none}
  .lookup-short{display:inline}
  .lookup{padding:8px 12px;font-size:13px}
  .brand-line{display:none}

  .rail{
    width:min(304px,86vw);
    align-items:stretch;
    padding:18px 16px 22px;
    border-right:1px solid var(--line-strong);
    transform:translateX(-102%);
    transition:transform .32s var(--ease);
  }
  .rail[data-open="true"]{transform:translateX(0);box-shadow:24px 0 60px rgba(11,13,18,.6)}
  .rail-head{
    flex-direction:row;align-items:center;justify-content:space-between;
    gap:12px;padding:0 0 14px;border-bottom:1px solid var(--line);
  }
  .rail-mark{flex-direction:row;align-items:center;gap:12px}
  .rail-mark-line{display:block;writing-mode:horizontal-tb;text-orientation:initial;font-size:11px;letter-spacing:.2em;color:var(--frost)}
  .rail-close{
    display:grid;place-items:center;
    width:34px;height:34px;
    border:1px solid var(--line-strong);border-radius:2px;
    color:var(--mist);font-size:14px;
    transition:border-color .2s var(--ease),color .2s var(--ease);
  }
  .rail-close:hover{border-color:var(--orange);color:var(--orange)}
  .rail-list{margin-top:14px;gap:2px}
  .rail-link{
    flex-direction:row;align-items:center;gap:14px;
    padding:13px 12px;border-radius:2px;
  }
  .rail-link::before{
    top:0;left:0;width:0;height:100%;
    transform:none;transition:width .22s var(--ease);
  }
  .rail-link:hover::before{width:2px;height:100%}
  .rail-link[aria-current="page"]::before{width:2px;height:100%}
  .rail-link[aria-current="page"]{background:var(--night)}
  .rail-idx{font-size:11px}
  .rail-label{writing-mode:horizontal-tb;text-orientation:initial;font-size:16px;letter-spacing:.08em}
  .rail-actions{display:flex;flex-direction:column;gap:10px;padding-top:16px;margin-top:12px;border-top:1px solid var(--line)}
  .rail-actions .btn{width:100%}
  .rail-foot{flex-direction:row;justify-content:space-between;align-items:center;gap:12px}
  .rail-progress{width:100%;height:2px;flex:1 1 auto}
  .rail-progress-fill{width:0;height:100%;transition:none}
}

/* ---------- 18 小屏收束 ---------- */
@media (max-width:900px){
  .grid--3,.grid--4{grid-template-columns:repeat(2,minmax(0,1fr))}
  .footer-top{grid-template-columns:1fr}
  .footer-brand{max-width:none}
  .footer-cols{grid-template-columns:repeat(3,minmax(0,1fr))}
}
@media (max-width:640px){
  body{font-size:16px}
  .wrap{padding-inline:20px}
  .topbar-inner{padding:10px 16px}
  .brand-name{font-size:17px}
  .rail{padding:16px 14px 20px}
  .grid--2,.grid--3,.grid--4{grid-template-columns:1fr;gap:16px}
  .footer-inner{padding-inline:20px}
  .footer-cols{grid-template-columns:repeat(2,minmax(0,1fr));gap:20px}
  .footer-dl-row{grid-template-columns:1fr;gap:2px}
  .footer-bottom{flex-direction:column;align-items:flex-start;gap:10px}
  .chapter-head{gap:12px}
  .panel{padding:20px}
  .frame{padding:20px}
}
@media (max-width:380px){
  .footer-cols{grid-template-columns:1fr}
}

/* ---------- 19 无动画偏好 ---------- */
@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{
    animation-duration:.001ms!important;
    animation-iteration-count:1!important;
    transition-duration:.001ms!important;
    scroll-behavior:auto!important;
  }
  html[data-reveal="ready"] .reveal:not(.is-in),
  html[data-reveal="ready"] .reveal.is-in{opacity:1;transform:none}
  .rail[data-open="true"]{box-shadow:none}
}