/* =========================================================
   KY CN · 开元棋牌 — 共享样式表 /assets/site.css
   墨绿夜色 · 琥珀金 · 霓虹青 · 堆叠面板 · 侧边轨道
   ========================================================= */

*,*::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,hr{margin:0}
ul,ol{padding:0;list-style:none}
img,svg{display:block;max-width:100%}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
a{color:inherit;text-decoration:none}
table{border-collapse:collapse;width:100%}

:root{
  --ink:#0B1F1A;
  --panel:#12332A;
  --line:#1C4A3C;
  --amber:#D99A2B;
  --amber-hi:#F2C66D;
  --cyan:#35E0D0;
  --paper:#F4F1E8;
  --brick:#C2543D;
  --violet:#8C7BFF;
  --mist:#9BB5A9;
  --body-text:#E6E1D5;
  --rail:264px;
  --maxw:1240px;
  --gutter:clamp(18px,4vw,40px);
  --font-serif:"Noto Serif SC","Source Han Serif SC","Songti SC",Georgia,"Times New Roman",serif;
  --font-sans:Inter,"Noto Sans SC",system-ui,-apple-system,"Segoe UI","Microsoft YaHei",sans-serif;
  --font-mono:"JetBrains Mono","IBM Plex Mono",ui-monospace,SFMono-Regular,Consolas,"Courier New",monospace;
}

::selection{background:var(--amber);color:var(--ink)}

body{
  min-height:100vh;
  font-family:var(--font-sans);
  font-size:17px;
  line-height:1.7;
  color:var(--body-text);
  background-color:var(--ink);
  background-image:
    linear-gradient(rgba(28,74,60,.28) 1px,transparent 1px),
    linear-gradient(90deg,rgba(28,74,60,.28) 1px,transparent 1px),
    radial-gradient(1200px 620px at 78% -10%,rgba(53,224,208,.10),transparent 68%),
    radial-gradient(900px 520px at 6% 14%,rgba(217,154,43,.08),transparent 70%);
  background-size:40px 40px,40px 40px,auto,auto;
  background-attachment:fixed;
}
@media (max-width:767px){ body{background-attachment:scroll} }

h1,h2,h3,h4{font-family:var(--font-serif);font-weight:800;letter-spacing:-.02em;line-height:1.12;color:var(--paper)}
h1{font-size:clamp(38px,5.4vw,72px);line-height:1.06}
h2{font-size:clamp(26px,3vw,40px)}
h3{font-size:clamp(19px,2vw,24px);font-weight:700}
h4{font-size:18px;font-weight:700}

:focus-visible{outline:2px solid var(--cyan);outline-offset:2px}

#main-content{scroll-margin-top:80px}
.site-main{display:block;min-height:58vh}

/* ---------- skip link ---------- */
.skip-link{
  position:fixed;top:10px;left:10px;z-index:130;
  padding:10px 16px;background:var(--amber);color:var(--ink);
  font-family:var(--font-mono);font-size:13px;font-weight:600;letter-spacing:.08em;
  transform:translateY(-180%);transition:transform 160ms ease;
}
.skip-link:focus{transform:none}

/* ---------- 侧边轨道头部 ---------- */
.site-header{
  position:fixed;inset:0 auto 0 0;z-index:80;
  width:var(--rail);
  display:flex;flex-direction:column;gap:22px;
  padding:26px 20px 22px;
  background:linear-gradient(168deg,#103026 0%,#0B1F1A 56%,#0A1A16 100%);
  border-right:1px solid var(--line);
}
.rail-head{display:flex;align-items:flex-start;justify-content:space-between;gap:12px}

.brand-block{display:flex;flex-direction:column;gap:6px;min-width:0}
.brand-mark{font-family:var(--font-serif);font-weight:800;font-size:26px;line-height:1.1;color:var(--paper);letter-spacing:-.01em}
.brand-line{font-family:var(--font-mono);font-size:11px;letter-spacing:.3em;text-transform:uppercase;color:var(--amber)}
.brand-sub{font-size:12px;letter-spacing:.06em;color:var(--mist)}
.brand-block:hover .brand-mark{color:var(--amber-hi)}

.nav-toggle{display:none}

.site-nav{display:flex;flex-direction:column;gap:18px;flex:1 1 auto;min-height:0;overflow-y:auto}
.nav-index{
  font-family:var(--font-mono);font-size:10px;letter-spacing:.22em;text-transform:uppercase;
  color:var(--mist);padding-bottom:10px;border-bottom:1px solid var(--line);
}
.nav-list{display:flex;flex-direction:column;gap:2px}
.nav-link{
  display:flex;align-items:baseline;gap:12px;
  padding:10px 12px;border-left:2px solid transparent;color:var(--paper);
  transition:background-color 160ms ease,border-color 160ms ease,color 160ms ease;
}
.nav-link:hover{background:rgba(28,74,60,.55);border-left-color:var(--amber);color:var(--amber-hi)}
.nav-num{font-family:var(--font-mono);font-size:11px;letter-spacing:.08em;color:var(--cyan)}
.nav-label{font-size:15px;letter-spacing:.02em}
.nav-link[aria-current="page"]{background:rgba(217,154,43,.12);border-left-color:var(--amber);color:var(--amber-hi)}
.nav-link[aria-current="page"] .nav-num{color:var(--amber)}

.nav-meta{
  margin-top:auto;padding-top:16px;border-top:1px solid var(--line);
  display:flex;flex-direction:column;gap:10px;
}
.meta-row{display:flex;align-items:baseline;justify-content:space-between;gap:10px;font-family:var(--font-mono);font-size:11px}
.meta-key{color:var(--mist);letter-spacing:.1em;text-transform:uppercase}
.meta-val{color:var(--paper);text-align:right}
.rail-cta{
  display:inline-flex;align-items:center;justify-content:center;
  margin-top:8px;padding:11px 14px;
  background:var(--amber);color:var(--ink);
  font-size:14px;font-weight:700;letter-spacing:.05em;
  transition:background-color 160ms ease,color 160ms ease;
}
.rail-cta:hover{background:var(--amber-hi)}

.rail-meter{
  position:absolute;top:0;right:0;width:3px;height:100%;
  background:rgba(28,74,60,.6);overflow:hidden;pointer-events:none;
}
.rail-meter-fill{
  display:block;width:100%;height:0;
  background:linear-gradient(180deg,var(--cyan),var(--amber));
  transition:height 120ms linear;
}

.nav-scrim{
  position:fixed;inset:0;z-index:78;display:none;
  background:rgba(5,14,11,.68);
  opacity:0;visibility:hidden;transition:opacity 180ms ease,visibility 180ms ease;
}

/* ---------- 通用容器 ---------- */
.wrap{width:100%;max-width:var(--maxw);margin:0 auto;padding:0 var(--gutter)}
.section{padding:clamp(40px,6vw,86px) 0}
.stack{display:flex;flex-direction:column;gap:clamp(16px,2vw,28px)}
.grid{display:grid;grid-template-columns:repeat(12,minmax(0,1fr));gap:clamp(16px,2.4vw,28px)}
.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-8{grid-column:span 8}
.col-12{grid-column:span 12}
.rule{height:1px;border:0;background:var(--line)}

/* ---------- 堆叠面板 ---------- */
.panel{
  position:relative;
  background:var(--panel);
  border:1px solid var(--line);
  padding:clamp(20px,2.6vw,34px);
}
.panel--flat{background:rgba(18,51,42,.55)}
.panel--raised{background:linear-gradient(160deg,#143A2F,#0E2921);box-shadow:0 24px 60px -40px rgba(0,0,0,.95)}
.panel-head{display:flex;flex-direction:column;gap:10px;margin-bottom:18px}
.sec-index{
  display:block;
  font-family:var(--font-mono);font-weight:600;
  font-size:clamp(38px,7vw,88px);line-height:.85;letter-spacing:-.04em;
  color:rgba(53,224,208,.16);
  -webkit-text-stroke:1px rgba(53,224,208,.55);
}
.eyebrow{
  font-family:var(--font-mono);font-size:10px;letter-spacing:.22em;text-transform:uppercase;color:var(--mist);
}
.mono{font-family:var(--font-mono);font-size:.88em;letter-spacing:.02em;color:var(--mist)}

/* ---------- 按钮 ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:12px 20px;border:1px solid var(--line);background:transparent;color:var(--paper);
  font-family:var(--font-sans);font-weight:600;font-size:14px;letter-spacing:.04em;
  transition:background-color 160ms ease,border-color 160ms ease,color 160ms ease,transform 160ms ease;
}
.btn:hover{border-color:var(--amber);color:var(--amber-hi);transform:translateY(-1px)}
.btn--amber{background:var(--amber);border-color:var(--amber);color:var(--ink)}
.btn--amber:hover{background:var(--amber-hi);border-color:var(--amber-hi);color:var(--ink)}
.btn--ghost{border-color:rgba(217,154,43,.5);color:var(--amber-hi)}
.btn--cyan{border-color:rgba(53,224,208,.5);color:var(--cyan)}
.btn--sm{padding:8px 14px;font-size:13px}

/* ---------- 面包屑 ---------- */
.breadcrumb{margin-bottom:22px}
.breadcrumb ol{display:flex;flex-wrap:wrap;align-items:center;gap:8px;font-family:var(--font-mono);font-size:11px;letter-spacing:.12em;text-transform:uppercase;color:var(--mist)}
.breadcrumb li{display:inline-flex;align-items:center}
.breadcrumb li:not(:first-child)::before{content:"/";margin:0 8px 0 0;color:var(--line)}
.breadcrumb a:hover{color:var(--amber-hi)}
.breadcrumb [aria-current="page"]{color:var(--paper)}

/* ---------- 长文 / 侧边索引 ---------- */
.prose{max-width:72ch;font-size:17px;line-height:1.8;color:var(--body-text)}
.prose h2{margin:38px 0 14px;font-size:clamp(22px,2.4vw,30px)}
.prose h3{margin:26px 0 10px}
.prose p+p{margin-top:14px}
.prose ul{list-style:square;padding-left:1.2em;margin-top:14px}
.prose ol{list-style:decimal;padding-left:1.4em;margin-top:14px}
.prose li+li{margin-top:6px}
.prose a{color:var(--cyan);border-bottom:1px solid rgba(53,224,208,.4)}
.prose strong{color:var(--paper)}
.prose blockquote{margin-top:18px;padding-left:16px;border-left:2px solid var(--amber);color:var(--mist)}
.prose code{font-family:var(--font-mono);font-size:.88em;color:var(--cyan)}

.toc{position:sticky;top:24px;display:flex;flex-direction:column;gap:10px;padding-left:16px;border-left:1px solid var(--line)}
.toc-title{font-family:var(--font-mono);font-size:10px;letter-spacing:.2em;text-transform:uppercase;color:var(--mist)}
.toc-link{font-size:14px;color:var(--mist);transition:color 140ms ease}
.toc-link:hover,.toc-link[aria-current="true"]{color:var(--amber-hi)}

/* ---------- 横向时间轴 ---------- */
.timeline{
  position:relative;display:flex;gap:18px;overflow-x:auto;
  padding:18px 4px 24px;scroll-snap-type:x proximity;-webkit-overflow-scrolling:touch;
}
.timeline-rail{position:absolute;left:0;right:0;top:34px;height:1px;background:var(--line)}
.timeline-node{position:relative;flex:0 0 clamp(180px,24vw,240px);scroll-snap-align:start;padding-top:44px}
.timeline-node::before{
  content:"";position:absolute;top:30px;left:0;width:9px;height:9px;
  background:var(--cyan);box-shadow:0 0 0 4px rgba(53,224,208,.16);
}
.timeline-node[data-state="archive"]::before{background:var(--brick);box-shadow:0 0 0 4px rgba(194,84,61,.18)}
.timeline-date{font-family:var(--font-mono);font-size:12px;letter-spacing:.08em;color:var(--mist)}
.timeline-title{margin-top:6px;font-family:var(--font-serif);font-weight:700;font-size:18px;color:var(--paper)}

/* ---------- 图片容器基座（页面阶段放占位图） ---------- */
.media-frame{
  position:relative;overflow:hidden;aspect-ratio:16 / 9;
  border:1px solid var(--line);
  background:linear-gradient(140deg,#143A2F,#0B1F1A 70%);
}
.media-frame img{width:100%;height:100%;object-fit:cover}
.media-frame::after{
  content:"";position:absolute;inset:0;pointer-events:none;
  background:linear-gradient(180deg,rgba(11,31,26,0) 44%,rgba(11,31,26,.74) 100%);
}
.media-frame--4x3{aspect-ratio:4 / 3}
.media-frame--1x1{aspect-ratio:1 / 1}
.media-frame--tall{aspect-ratio:3 / 4}
.media-frame--wide{aspect-ratio:21 / 9}
.media-frame--plain::after{display:none}
.media-caption{margin-top:10px;font-family:var(--font-mono);font-size:11px;letter-spacing:.08em;color:var(--mist)}

/* ---------- 数据块与标签 ---------- */
.stat{display:flex;flex-direction:column;gap:6px;padding:16px 18px;border:1px solid var(--line);background:rgba(18,51,42,.5)}
.stat-value{font-family:var(--font-mono);font-weight:600;font-size:clamp(22px,2.6vw,30px);color:var(--amber-hi)}
.stat-label{font-family:var(--font-mono);font-size:10px;letter-spacing:.18em;text-transform:uppercase;color:var(--mist)}

.tag{
  display:inline-flex;align-items:center;gap:6px;padding:4px 9px;
  border:1px solid var(--line);background:rgba(11,31,26,.6);
  font-family:var(--font-mono);font-size:11px;letter-spacing:.1em;text-transform:uppercase;color:var(--mist);
}
.tag--amber{border-color:rgba(217,154,43,.55);color:var(--amber-hi)}
.tag--cyan{border-color:rgba(53,224,208,.5);color:var(--cyan)}
.tag--old{border-color:rgba(194,84,61,.6);color:#E08A76}

.notice{border-left:2px solid var(--amber);background:rgba(217,154,43,.08);padding:14px 18px;font-size:15px;color:var(--body-text)}

/* ---------- 主题筛选（仅过滤本页已有条目） ---------- */
.filter-bar{
  display:flex;flex-wrap:wrap;align-items:center;gap:10px;
  padding:14px 0;border-top:1px solid var(--line);border-bottom:1px solid var(--line);
}
.filter-btn{
  padding:8px 14px;border:1px solid var(--line);background:rgba(18,51,42,.45);color:var(--mist);
  font-family:var(--font-mono);font-size:11px;letter-spacing:.14em;text-transform:uppercase;
  transition:color 160ms ease,border-color 160ms ease,background-color 160ms ease;
}
.filter-btn:hover{color:var(--paper);border-color:var(--amber)}
.filter-btn[aria-pressed="true"]{background:rgba(140,123,255,.16);border-color:var(--violet);color:#C6BDFF}
.filter-count{margin-left:auto;font-family:var(--font-mono);font-size:11px;letter-spacing:.1em;color:var(--mist)}
[data-filter-item].is-filtered{display:none}
@keyframes filterIn{from{opacity:0;transform:translateY(8px)}to{opacity:1;transform:none}}
.filter-item-in{animation:filterIn 220ms ease both}

/* ---------- 折叠问答 ---------- */
.disclosure{border:1px solid var(--line);background:rgba(18,51,42,.45)}
.disclosure+.disclosure{margin-top:-1px}
.disclosure-toggle{
  width:100%;display:flex;align-items:center;justify-content:space-between;gap:16px;
  padding:16px 18px;text-align:left;color:var(--paper);
  font-family:var(--font-serif);font-weight:700;font-size:17px;
}
.disclosure-toggle::after{content:"+";font-family:var(--font-mono);color:var(--amber);font-weight:600}
.disclosure-toggle[aria-expanded="true"]::after{content:"–"}
.disclosure-toggle:hover{color:var(--amber-hi)}
.disclosure-panel{padding:0 18px 18px;font-size:15px;line-height:1.75;color:var(--mist)}
.disclosure-panel[hidden]{display:none}

/* ---------- 显现 ---------- */
.has-js [data-reveal]{opacity:0;transform:translateY(14px);transition:opacity 240ms ease,transform 240ms ease}
.has-js [data-reveal].is-visible{opacity:1;transform:none}

/* ---------- 页脚 ---------- */
.site-footer{
  position:relative;color:var(--paper);
  background:linear-gradient(180deg,#0C211B,#081712);
  border-top:1px solid var(--line);
}
.site-footer::before{
  content:"";position:absolute;top:-1px;left:0;width:min(320px,42%);height:2px;
  background:linear-gradient(90deg,var(--amber),rgba(217,154,43,0));
}
.footer-inner{max-width:var(--maxw);margin:0 auto;padding:clamp(36px,5vw,64px) var(--gutter) 28px}
.footer-grid{display:grid;grid-template-columns:1.5fr .8fr .8fr 1.2fr;gap:clamp(24px,3vw,44px)}

.footer-brand{display:flex;flex-direction:column;align-items:flex-start;gap:10px}
.footer-brand-mark{font-family:var(--font-serif);font-weight:800;font-size:clamp(24px,2.6vw,30px);letter-spacing:-.01em;color:var(--paper)}
.footer-brand-sub{font-family:var(--font-mono);font-size:11px;letter-spacing:.16em;text-transform:uppercase;color:var(--amber)}
.footer-note{max-width:36ch;font-size:14px;line-height:1.72;color:var(--mist)}

.footer-col{display:flex;flex-direction:column;gap:14px}
.footer-col-title{
  font-family:var(--font-mono);font-weight:500;font-size:10px;letter-spacing:.22em;
  text-transform:uppercase;color:var(--cyan);
}
.footer-list{display:flex;flex-direction:column;gap:9px}
.footer-link{font-size:15px;color:var(--paper);border-bottom:1px solid transparent;transition:color 140ms ease,border-color 140ms ease}
.footer-link:hover{color:var(--amber-hi);border-bottom-color:var(--amber)}
.footer-link[aria-current="page"]{color:var(--amber-hi)}

.footer-contact{display:flex;flex-direction:column;gap:12px}
.contact-row{display:grid;grid-template-columns:54px 1fr;gap:10px;align-items:baseline;font-size:14px}
.contact-key{font-family:var(--font-mono);font-size:10px;letter-spacing:.16em;text-transform:uppercase;color:var(--mist)}
.contact-val{color:var(--paper);word-break:break-word}

.footer-bottom{
  margin-top:clamp(28px,4vw,48px);padding-top:18px;border-top:1px solid var(--line);
  display:flex;flex-wrap:wrap;align-items:center;gap:12px 24px;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.06em;color:var(--mist);
}
.footer-icp{color:var(--paper)}
.footer-region{color:var(--cyan)}
.footer-copy{color:var(--mist)}
.footer-legal{display:flex;gap:16px;margin-left:auto}
.legal-link{font-family:var(--font-mono);font-size:12px;color:var(--mist);border-bottom:1px solid rgba(155,181,169,.35)}
.legal-link:hover{color:var(--amber-hi);border-bottom-color:var(--amber)}

/* ---------- 响应式：抽屉与顶栏 ---------- */
@media (min-width:1024px){
  body{padding-left:var(--rail)}
}

@media (max-width:1023px){
  body{padding-top:66px}
  .site-header{
    inset:0 0 auto 0;width:auto;height:66px;
    flex-direction:row;align-items:center;justify-content:space-between;gap:12px;
    padding:0 16px;border-right:0;border-bottom:1px solid var(--line);
  }
  .rail-head{flex-direction:row;align-items:center;justify-content:space-between;width:100%;gap:16px}
  .brand-block{gap:2px}
  .brand-mark{font-size:19px}
  .brand-sub{display:none}

  .nav-toggle{
    display:inline-flex;align-items:center;gap:10px;
    padding:10px 12px;border:1px solid var(--line);background:rgba(18,51,42,.72);color:var(--paper);
    font-family:var(--font-mono);font-size:11px;letter-spacing:.18em;text-transform:uppercase;
  }
  .nav-toggle:hover{border-color:var(--amber);color:var(--amber-hi)}
  .nav-toggle-bars{position:relative;display:block;width:16px;height:2px;background:var(--amber)}
  .nav-toggle-bars::before,.nav-toggle-bars::after{
    content:"";position:absolute;left:0;width:16px;height:2px;background:var(--amber);
    transition:transform 180ms ease;
  }
  .nav-toggle-bars::before{top:-5px}
  .nav-toggle-bars::after{top:5px}
  .site-header[data-open] .nav-toggle-bars{background:transparent}
  .site-header[data-open] .nav-toggle-bars::before{transform:translateY(5px) rotate(45deg)}
  .site-header[data-open] .nav-toggle-bars::after{transform:translateY(-5px) rotate(-45deg)}

  .site-nav{
    position:fixed;top:66px;left:0;bottom:0;z-index:79;
    width:min(320px,84vw);padding:20px 18px 28px;
    background:#0C211B;border-right:1px solid var(--line);
    transform:translateX(-102%);transition:transform 220ms ease;overflow-y:auto;
  }
  .site-nav[data-open],.site-header[data-open] .site-nav{transform:translateX(0)}

  .nav-scrim{display:block}
  .site-header[data-open] .nav-scrim{opacity:1;visibility:visible}

  .rail-meter{display:none}

  .grid{grid-template-columns:repeat(2,minmax(0,1fr))}
  .col-4,.col-6{grid-column:span 1}
  .col-5,.col-7,.col-8,.col-12{grid-column:span 2}

  .footer-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
  .footer-brand{grid-column:1 / -1}
}

@media (max-width:640px){
  body{font-size:16px}
  .grid{grid-template-columns:1fr}
  .col-4,.col-5,.col-6,.col-7,.col-8,.col-12{grid-column:span 1}
  .footer-grid{grid-template-columns:1fr}
  .footer-legal{margin-left:0}
  .footer-bottom{gap:10px 18px}
}

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