/* ============================================================
   KAIYUN看台 / assets/site.css
   共享外壳：reset、tokens、中文排版、头部、页脚、通用组件
   ============================================================ */

*,*::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;}
ul,ol{padding:0;list-style:none;}
img,svg,video{display:block;max-width:100%;}
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 #5BE37A;outline-offset:3px;}

/* ---------- tokens ---------- */
:root{
  --ink:#0B1310;
  --tier:#141A17;
  --grass:#123225;
  --neon:#5BE37A;
  --gold:#E8B54A;
  --paper:#EDE6D6;
  --paper-dim:#C9C2B0;
  --cold:#F4F7F3;
  --signal:#C6483C;
  --rule:#3A4640;
  --rule-soft:rgba(58,70,64,.6);
  --ink-rule:rgba(11,19,16,.16);

  --font-display:"PingFang SC","Hiragino Sans GB","Source Han Sans SC","Noto Sans SC","Microsoft YaHei",system-ui,-apple-system,sans-serif;
  --font-body:"PingFang SC","Hiragino Sans GB","Source Han Sans SC","Noto Sans SC","Microsoft YaHei",system-ui,-apple-system,sans-serif;
  --font-num:ui-monospace,SFMono-Regular,"SF Mono",Menlo,Consolas,"Liberation Mono","Courier New",monospace;

  --step-display:clamp(2.4rem,6vw,5rem);
  --step-h1:clamp(1.8rem,3.4vw,2.6rem);
  --step-h2:1.35rem;
  --step-body:1.0625rem;
  --step-label:.75rem;

  --wrap:1280px;
  --gutter:clamp(1.1rem,4vw,2.75rem);
  --pad-block:clamp(2.5rem,7vw,5.5rem);
}

/* ---------- base / 中文排版 ---------- */
body{
  background:var(--ink);
  color:var(--cold);
  font-family:var(--font-body);
  font-size:var(--step-body);
  line-height:1.75;
  letter-spacing:.01em;
  text-rendering:optimizeLegibility;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
h1,h2,h3,h4{font-family:var(--font-display);font-weight:800;line-height:1.18;letter-spacing:-.02em;text-wrap:balance;}
p{text-wrap:pretty;}
strong{color:var(--gold);font-weight:700;}
::selection{background:var(--neon);color:var(--ink);}
#main-content{display:block;scroll-margin-top:5.5rem;}

.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;}

.skip-link{
  position:fixed;top:.75rem;left:-9999px;z-index:200;
  padding:.65rem 1rem;background:var(--neon);color:var(--ink);
  font-family:var(--font-num);font-size:.8rem;letter-spacing:.08em;
}
.skip-link:focus{left:.75rem;}

.wrap{width:100%;max-width:var(--wrap);margin-inline:auto;padding-inline:var(--gutter);}

/* ---------- 分区骨架 ---------- */
.section{padding-block:var(--pad-block);border-top:1px solid var(--rule-soft);}
.section--first{border-top:0;}
.eyebrow{
  display:block;margin-bottom:.85rem;
  font-family:var(--font-num);font-size:.6875rem;font-weight:600;
  letter-spacing:.18em;text-transform:uppercase;color:var(--gold);
}
.section__title{font-size:var(--step-h1);}
.section__lead{margin-top:.9rem;max-width:58ch;color:var(--paper-dim);}

.prose{max-width:68ch;color:var(--cold);}
.prose>*+*{margin-top:1.1em;}
.prose h2{font-size:var(--step-h2);margin-top:1.8em;color:var(--cold);}
.prose h3{font-size:1.1rem;margin-top:1.6em;}
.prose p{line-height:1.75;}
.prose ul{display:grid;gap:.5rem;padding-left:1.1rem;list-style:square;}
.prose ul li::marker{color:var(--neon);}
.prose blockquote{border-left:2px solid var(--gold);padding-left:1rem;color:var(--paper-dim);}

.zone-paper{background:var(--paper);color:var(--ink);}
.zone-paper .eyebrow{color:#8A6A1E;}
.zone-paper .section__lead,.zone-paper .prose{color:#2A332D;}

/* ---------- 网格 ---------- */
.grid{display:grid;gap:clamp(1rem,3vw,2rem);}
.grid--12{grid-template-columns:repeat(12,minmax(0,1fr));}
.layout-split{display:grid;grid-template-columns:1fr;gap:clamp(1.5rem,4vw,3rem);}
.content-col{min-width:0;}
.rail-col{min-width:0;}
@media (min-width:960px){
  .layout-split{grid-template-columns:minmax(150px,2fr) minmax(0,9fr);}
  .rail-col{border-right:1px solid var(--rule-soft);padding-right:1.5rem;}
}

/* ---------- 标签 ---------- */
.tag{
  display:inline-flex;align-items:center;
  padding:.12rem .4rem;border:1px solid var(--rule);
  color:var(--paper-dim);
  font-family:var(--font-num);font-size:.625rem;line-height:1.7;
  letter-spacing:.18em;text-transform:uppercase;white-space:nowrap;
}
.tag--channel{color:var(--neon);border-color:rgba(91,227,122,.5);}
.tag--version{color:var(--gold);border-color:rgba(232,181,74,.45);}

/* ---------- 按钮 ---------- */
.btn{
  display:inline-flex;align-items:center;gap:.5rem;
  padding:.7rem 1.15rem;border:1px solid var(--neon);background:transparent;
  color:var(--neon);font-family:var(--font-num);font-size:.78rem;font-weight:600;
  letter-spacing:.12em;text-transform:uppercase;line-height:1.4;
  transition:background-color .2s ease,color .2s ease,border-color .2s ease;
}
.btn:hover{background:var(--neon);color:var(--ink);}
.btn--solid{background:var(--neon);color:var(--ink);}
.btn--solid:hover{background:#82EE9D;border-color:#82EE9D;color:var(--ink);}
.btn--gold{border-color:var(--gold);color:var(--gold);}
.btn--gold:hover{background:var(--gold);color:var(--ink);}
.btn--ghost{border-color:var(--rule);color:var(--paper);}
.btn--ghost:hover{background:var(--paper);border-color:var(--paper);color:var(--ink);}
.btn--sm{padding:.45rem .75rem;font-size:.68rem;}

/* ---------- 面包屑 ---------- */
.breadcrumb{
  font-family:var(--font-num);font-size:.7rem;letter-spacing:.14em;
  text-transform:uppercase;color:var(--paper-dim);
}
.breadcrumb__list{display:flex;flex-wrap:wrap;align-items:center;gap:.5rem;}
.breadcrumb__item{display:flex;align-items:center;gap:.5rem;}
.breadcrumb__item+.breadcrumb__item::before{content:"/";color:var(--rule);}
.breadcrumb__link{transition:color .2s ease;}
.breadcrumb__link:hover{color:var(--neon);}
.breadcrumb__current{color:var(--cold);}

/* ---------- 面板 ---------- */
.panel{background:var(--tier);border:1px solid var(--rule-soft);}
.panel__head{
  display:flex;flex-wrap:wrap;align-items:baseline;justify-content:space-between;gap:.75rem;
  padding:1rem 1.25rem;background:var(--grass);border-bottom:1px solid var(--rule-soft);
}
.panel__title{font-family:var(--font-display);font-size:1.05rem;font-weight:800;letter-spacing:-.01em;}
.panel__body{padding:1.25rem;}
.panel--paper{background:var(--paper);border-color:var(--ink-rule);color:var(--ink);}
.panel--paper .panel__head{background:rgba(18,50,37,.12);border-bottom-color:var(--ink-rule);}
.panel--paper .panel__title{color:var(--ink);}

/* ---------- 数据表 ---------- */
.data-table{font-family:var(--font-num);font-size:.8125rem;font-variant-numeric:tabular-nums;}
.data-table th{
  padding:.7rem .8rem;text-align:left;font-weight:600;
  font-size:.66rem;letter-spacing:.16em;text-transform:uppercase;
  color:var(--paper-dim);background:rgba(18,50,37,.5);
  border-bottom:1px solid var(--rule);
}
.data-table td{padding:.7rem .8rem;border-bottom:1px solid var(--rule-soft);}
.data-table tbody tr{transition:background-color .18s ease;}
.data-table tbody tr:hover{background:rgba(91,227,122,.06);}
.data-table .is-key{color:var(--gold);}

/* ---------- 指标 ---------- */
.stat{display:grid;gap:.2rem;}
.stat__value{
  font-family:var(--font-num);font-size:clamp(1.4rem,3vw,2.05rem);
  font-variant-numeric:tabular-nums;letter-spacing:-.02em;line-height:1.1;color:var(--cold);
}
.stat__label{
  font-family:var(--font-num);font-size:.66rem;letter-spacing:.18em;
  text-transform:uppercase;color:var(--paper-dim);
}

/* ---------- 图片容器（页面阶段放入 <img>） ---------- */
.figure{margin:0;}
.figure__frame{
  position:relative;overflow:hidden;background:var(--grass);
  border:1px solid var(--rule-soft);aspect-ratio:16/9;
}
.figure__frame::after{
  content:"";position:absolute;inset:0;pointer-events:none;
  background:repeating-linear-gradient(180deg,rgba(244,247,243,.05) 0 1px,transparent 1px 4px);
}
.figure__frame img{width:100%;height:100%;object-fit:cover;}
.figure__frame--wide{aspect-ratio:21/9;}
.figure__frame--square{aspect-ratio:1/1;}
.figure__frame--tall{aspect-ratio:4/5;}
.figure__caption{
  margin-top:.6rem;font-family:var(--font-num);font-size:.7rem;
  letter-spacing:.1em;text-transform:uppercase;color:var(--paper-dim);
}

/* ---------- 可展开内容组 ---------- */
.disclosure{background:var(--tier);border:1px solid var(--rule-soft);}
.disclosure__toggle{
  display:flex;align-items:center;justify-content:space-between;gap:1rem;
  width:100%;padding:.9rem 1.1rem;text-align:left;
  font-family:var(--font-body);font-size:.95rem;letter-spacing:0;color:var(--cold);
  transition:background-color .2s ease,color .2s ease;
}
.disclosure__toggle:hover{background:rgba(91,227,122,.06);color:var(--neon);}
.disclosure__toggle::after{
  content:"+";font-family:var(--font-num);font-size:1.05rem;color:var(--neon);
}
.disclosure__toggle[aria-expanded="true"]::after{content:"–";color:var(--gold);}
.disclosure__panel{padding:1.1rem;border-top:1px solid var(--rule-soft);}
.disclosure__panel[hidden]{display:none;}

/* ---------- 进入视口显现 ---------- */
[data-reveal="pending"]{opacity:0;transform:translateY(14px);}
[data-reveal="shown"]{opacity:1;transform:none;transition:opacity .5s ease-out,transform .5s ease-out;}

/* ============================================================
   头部：框架式导航 + 常驻刻度条
   ============================================================ */
.site-header{
  position:sticky;top:0;z-index:90;
  background:rgba(11,19,16,.95);
  border-bottom:1px solid var(--rule);
  -webkit-backdrop-filter:blur(10px);
  backdrop-filter:blur(10px);
}
.header-frame{
  display:flex;align-items:center;justify-content:space-between;gap:1rem;
  width:100%;max-width:var(--wrap);margin-inline:auto;
  padding:clamp(.7rem,1.6vw,1rem) var(--gutter);
  transition:padding-top .25s ease,padding-bottom .25s ease;
}
.site-header[data-condensed="true"] .header-frame{padding-top:.4rem;padding-bottom:.4rem;}

.brand{display:inline-flex;align-items:center;gap:.7rem;flex:0 0 auto;}
.brand__name{
  font-family:var(--font-display);font-weight:800;font-size:1.25rem;
  letter-spacing:-.02em;color:var(--cold);transition:color .2s ease,font-size .25s ease;
}
.site-header[data-condensed="true"] .brand__name{font-size:1.08rem;}
.brand:hover .brand__name{color:var(--neon);}
.brand__tags{display:inline-flex;align-items:center;gap:.35rem;}

/* 移动端导航按钮 */
.nav-toggle{
  display:inline-flex;align-items:center;gap:.5rem;
  padding:.5rem .7rem;border:1px solid var(--rule);color:var(--paper);
  font-family:var(--font-num);font-size:.68rem;letter-spacing:.16em;text-transform:uppercase;
  order:3;
}
.nav-toggle__bars{position:relative;display:block;width:16px;height:1px;background:var(--neon);}
.nav-toggle__bars::before,
.nav-toggle__bars::after{
  content:"";position:absolute;left:0;width:16px;height:1px;background:var(--neon);
  transition:transform .25s ease;
}
.nav-toggle__bars::before{top:-5px;}
.nav-toggle__bars::after{top:5px;}
.nav-toggle[data-open] .nav-toggle__bars{background:transparent;}
.nav-toggle[data-open] .nav-toggle__bars::before{transform:translateY(5px) rotate(45deg);}
.nav-toggle[data-open] .nav-toggle__bars::after{transform:translateY(-5px) rotate(-45deg);}

/* 导航：移动端为顶部下滑面板 */
.site-nav{
  position:absolute;left:0;right:0;top:100%;z-index:95;
  background:var(--tier);border-bottom:1px solid var(--rule);
  max-height:0;overflow:hidden;visibility:hidden;
  transition:max-height .28s ease,visibility .28s linear;
}
.site-nav[data-open]{max-height:min(70vh,560px);overflow-y:auto;visibility:visible;}
.site-nav__list{display:grid;}
.site-nav__item{display:flex;}
.site-nav__link{
  display:flex;align-items:center;width:100%;
  padding:.85rem var(--gutter);border-top:1px solid var(--rule-soft);
  font-size:.92rem;letter-spacing:.04em;color:var(--paper);
  transition:background-color .2s ease,color .2s ease;
}
.site-nav__link:hover{background:rgba(91,227,122,.08);color:var(--neon);}
.site-nav__link[aria-current="page"]{
  color:var(--neon);background:rgba(91,227,122,.08);
  box-shadow:inset 3px 0 0 var(--neon);
}

/* 常驻刻度条 */
.header-ticker{
  display:flex;align-items:center;gap:.75rem;
  width:100%;max-width:var(--wrap);margin-inline:auto;
  padding:.4rem var(--gutter) .55rem;border-top:1px solid var(--rule-soft);
  font-family:var(--font-num);font-size:.66rem;letter-spacing:.16em;
  text-transform:uppercase;color:var(--paper-dim);
}
.ticker__label{color:var(--paper-dim);}
.ticker__value{
  color:var(--gold);letter-spacing:.08em;font-variant-numeric:tabular-nums;
}
.rail{position:relative;flex:1 1 auto;min-width:44px;height:2px;background:var(--rule);}
.rail__fill{
  position:absolute;top:0;bottom:0;left:0;width:var(--progress,0%);background:var(--neon);
}
.ticker__note{color:var(--paper-dim);white-space:nowrap;}

.scroll-rail{
  position:absolute;left:0;right:0;bottom:-1px;height:2px;
  background:transparent;overflow:hidden;pointer-events:none;
}
.scroll-rail__fill{
  display:block;height:100%;width:100%;background:var(--neon);
  transform:scaleX(0);transform-origin:left center;
}

/* 桌面端：导航成为页面顶部的一条细边框 */
@media (min-width:900px){
  .nav-toggle{display:none;}
  .site-nav{
    position:static;max-height:none;overflow:visible;visibility:visible;
    background:none;border-bottom:0;
  }
  .site-nav__list{display:flex;align-items:stretch;justify-content:flex-end;}
  .site-nav__link{
    width:auto;padding:.85rem clamp(.7rem,1.5vw,1.15rem);
    border-top:0;border-left:1px solid var(--rule-soft);
    font-size:.8rem;letter-spacing:.08em;
  }
  .site-nav__item:last-child .site-nav__link{border-right:1px solid var(--rule-soft);}
  .site-nav__link[aria-current="page"]{
    box-shadow:inset 0 -2px 0 var(--neon);
  }
}
@media (max-width:599px){
  .ticker__note{display:none;}
  .brand__tags .tag--version{display:none;}
}

/* ============================================================
   页脚：后台面板式三栏
   ============================================================ */
.site-footer{
  margin-top:clamp(2.5rem,7vw,6rem);
  background:var(--tier);border-top:1px solid var(--rule);
}
.footer-grid{
  display:grid;grid-template-columns:1fr;gap:clamp(1.6rem,4vw,3rem);
  width:100%;max-width:var(--wrap);margin-inline:auto;
  padding:clamp(2rem,5vw,3.5rem) var(--gutter) clamp(1.5rem,3vw,2.5rem);
}
@media (min-width:760px){
  .footer-grid{grid-template-columns:1.1fr 1fr 1.05fr;}
}
.footer-col{min-width:0;}
.footer-brand{display:flex;align-items:center;flex-wrap:wrap;gap:.5rem;margin-bottom:1.2rem;}
.footer-brand__name{
  font-family:var(--font-display);font-weight:800;font-size:1.12rem;
  letter-spacing:-.02em;color:var(--cold);
}
.footer-col__title{
  margin-bottom:.95rem;font-family:var(--font-num);font-weight:600;
  font-size:.66rem;letter-spacing:.18em;text-transform:uppercase;color:var(--gold);
}
.footer-list{display:grid;gap:.45rem;}
.footer-list--legal{margin-top:1rem;padding-top:1rem;border-top:1px solid var(--rule-soft);}
.footer-list__link{
  font-size:.9rem;color:var(--paper-dim);transition:color .2s ease;
}
.footer-list__link:hover{color:var(--neon);}
.footer-note{max-width:40ch;font-size:.9rem;color:var(--paper-dim);}
.footer-note+.footer-note{margin-top:.6rem;}
.footer-contact{display:grid;gap:.85rem;margin-bottom:1.3rem;}
.footer-contact__item{display:grid;gap:.15rem;}
.footer-contact__label{
  font-family:var(--font-num);font-size:.62rem;letter-spacing:.18em;
  text-transform:uppercase;color:var(--paper-dim);
}
.footer-contact__value{
  font-family:var(--font-num);font-size:.85rem;color:var(--cold);word-break:break-all;
}
.footer-contact__value--address{
  font-family:var(--font-body);letter-spacing:.01em;line-height:1.7;word-break:break-word;
}
.footer-bottom{
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;
  gap:.5rem 1.5rem;
  width:100%;max-width:var(--wrap);margin-inline:auto;
  padding:1rem var(--gutter) 1.6rem;border-top:1px solid var(--rule-soft);
}
.footer-icp{
  font-family:var(--font-num);font-size:.7rem;letter-spacing:.1em;color:var(--paper-dim);
}

/* ============================================================
   动效降级
   ============================================================ */
@media (prefers-reduced-motion: reduce){
  html{scroll-behavior:auto;}
  *,*::before,*::after{
    animation-duration:.001ms!important;animation-iteration-count:1!important;
    transition-duration:.001ms!important;
  }
  [data-reveal="pending"]{opacity:1;transform:none;}
  .scroll-rail__fill{transition:none;}
}