/* ============================================================
   开体育官网 — /assets/site.css
   共享壳层：reset / 变量 / 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;scroll-padding-top:calc(var(--header-h,112px) + 14px)}
html.is-nav-open{overflow:hidden}
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%}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
a{color:inherit;text-decoration:none}
h1,h2,h3,h4{font-weight:900;letter-spacing:-.02em;line-height:1.15}
table{border-collapse:collapse}

:root{
  --ink:#0A0D0C;
  --ink-2:#0E1512;
  --pine:#12241C;
  --pine-2:#16291F;
  --lime:#B8FF3D;
  --lime-dark:#6F9E1F;
  --orange:#FF6B2C;
  --blue:#2FA8FF;
  --indigo:#3A2E6B;
  --wine:#7A1F33;
  --wine-text:#F7E9EC;
  --paper:#F2F5F1;
  --fog:#9AA39C;
  --line:rgba(242,245,241,.14);
  --line-strong:rgba(184,255,61,.42);
  --line-dash:rgba(242,245,241,.2);
  --ease:cubic-bezier(.2,.8,.2,1);
  --wrap:1200px;
  --header-h:112px;
  --cut:18px;
  --font-head:"Noto Sans SC","Source Han Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,sans-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",ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
}

body{
  background:var(--ink);
  color:var(--paper);
  font-family:var(--font-body);
  font-size:16px;
  line-height:1.75;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}

/* ---------- 基础排版工具 ---------- */
.mono{font-family:var(--font-mono);font-variant-numeric:tabular-nums;-moz-font-feature-settings:"tnum";font-feature-settings:"tnum"}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0}
.label{display:inline-block;font-family:var(--font-mono);font-size:12.5px;letter-spacing:.08em;text-transform:uppercase;color:var(--fog)}
.eyebrow{display:inline-flex;align-items:center;gap:10px;font-family:var(--font-mono);font-size:12.5px;letter-spacing:.08em;text-transform:uppercase;color:var(--lime)}
.eyebrow::before{content:"";width:24px;height:2px;background:currentColor;flex:0 0 auto}
.display{font-family:var(--font-head);font-weight:900;letter-spacing:-.02em;line-height:1.04;font-size:clamp(36px,8vw,76px)}
.h2{font-size:clamp(24px,4vw,40px);font-weight:900;letter-spacing:-.02em;line-height:1.14}
.h3{font-size:clamp(18px,2.2vw,22px);font-weight:800;letter-spacing:-.01em;line-height:1.3}
.lede{font-size:17px;line-height:1.75;color:rgba(242,245,241,.82);max-width:60ch}
.section--paper .lede,.cut-panel--paper .lede{color:rgba(10,13,12,.76)}

/* ---------- 布局 ---------- */
.wrap{width:100%;max-width:var(--wrap);margin-inline:auto;padding-inline:20px}
.section{padding:64px 0}
.section--pine{background:var(--pine)}
.section--indigo{background:var(--indigo)}
.section--wine{background:var(--wine);color:var(--wine-text)}
.section--paper{background:var(--paper);color:var(--ink)}
.section--paper .label,.section--paper .eyebrow{color:var(--lime-dark)}
.section--paper .eyebrow::before{background:var(--lime-dark)}
.section--paper .idx-num{color:var(--lime-dark)}
.section--paper .idx-desc{color:#5A625A}
.section--paper{--line:rgba(10,13,12,.14);--line-strong:rgba(111,158,31,.5)}

.rail{position:relative;height:24px;overflow:hidden}
.rail::before{content:"";position:absolute;left:-4%;right:-4%;top:50%;height:1px;background:linear-gradient(90deg,transparent,rgba(184,255,61,.55),rgba(255,107,44,.36),transparent);transform:rotate(-1.4deg)}
.rail::after{content:"";position:absolute;left:8%;top:50%;width:8px;height:8px;background:var(--lime);transform:translate(-50%,-50%) rotate(45deg)}

.grid{display:grid;gap:20px}
.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))}

/* ---------- 跳转链接 ---------- */
.skip-link{
  position:absolute;left:16px;top:-80px;z-index:300;
  background:var(--lime);color:var(--ink);
  padding:10px 18px;font-weight:800;font-size:14px;
  clip-path:polygon(0 0,100% 0,100% calc(100% - 10px),calc(100% - 10px) 100%,0 100%);
  transition:top .2s var(--ease);
}
.skip-link:focus{top:12px}

/* ---------- 头部 ---------- */
.site-header{
  position:sticky;top:0;z-index:100;
  background:linear-gradient(180deg,rgba(10,13,12,.98),rgba(10,13,12,.93));
  border-bottom:1px solid var(--line-strong);
  -webkit-backdrop-filter:blur(10px);
  backdrop-filter:blur(10px);
}

.scroll-progress{position:fixed;top:0;left:0;right:0;height:3px;z-index:130;pointer-events:none}
.scroll-progress-bar{
  display:block;height:100%;width:100%;
  background:linear-gradient(90deg,var(--lime),var(--orange));
  transform:scaleX(0);transform-origin:0 50%;
}

.header-top{background:var(--ink-2);border-bottom:1px dashed rgba(184,255,61,.24)}
.header-top-inner{display:flex;align-items:center;justify-content:space-between;gap:16px;min-height:54px}

.brand{display:inline-flex;align-items:center;gap:12px;min-width:0}
.brand-mark{
  flex:0 0 auto;width:34px;height:34px;display:grid;place-items:center;
  background:var(--lime);color:var(--ink);
  font-family:var(--font-head);font-weight:900;font-size:18px;line-height:1;
  clip-path:polygon(0 0,100% 0,100% calc(100% - 10px),calc(100% - 10px) 100%,0 100%);
}
.brand-text{display:flex;flex-direction:column;min-width:0}
.brand-name{font-family:var(--font-head);font-weight:900;font-size:18px;letter-spacing:-.02em;line-height:1.15}
.brand-line{font-family:var(--font-mono);font-size:11.5px;letter-spacing:.08em;color:var(--fog);line-height:1.3}
.brand--footer .brand-mark{width:38px;height:38px;font-size:20px}

.header-quick{display:flex;align-items:center;gap:8px}
.quick-link{
  display:inline-flex;align-items:center;gap:8px;
  padding:7px 14px;font-size:13px;font-weight:700;letter-spacing:.02em;
  color:rgba(242,245,241,.82);
  border:1px solid var(--line);
  clip-path:polygon(0 0,100% 0,100% calc(100% - 9px),calc(100% - 9px) 100%,0 100%);
  transition:color .2s var(--ease),border-color .2s var(--ease),background .2s var(--ease);
}
.quick-dot{width:6px;height:6px;background:var(--lime);flex:0 0 auto}
.quick-link--alt .quick-dot{background:var(--orange)}
.quick-link:hover,.quick-link:focus-visible{color:var(--ink);background:var(--lime);border-color:var(--lime)}
.quick-link--alt:hover,.quick-link--alt:focus-visible{background:var(--orange);color:#180A03;border-color:var(--orange)}

.header-main-inner{display:flex;align-items:center;justify-content:space-between;gap:20px;min-height:58px}
.header-coord{display:flex;align-items:center;gap:8px;font-family:var(--font-mono);font-size:12px;letter-spacing:.08em;text-transform:uppercase;color:var(--fog)}
.coord-key{color:var(--lime)}
.coord-sep{color:rgba(154,163,156,.5)}

.nav-toggle{
  display:none;align-items:center;gap:10px;
  padding:9px 14px;font-family:var(--font-mono);font-size:12px;letter-spacing:.08em;
  color:var(--paper);border:1px solid var(--line-strong);
  clip-path:polygon(0 0,100% 0,100% calc(100% - 10px),calc(100% - 10px) 100%,0 100%);
}
.nav-toggle-bars{width:18px;height:2px;background:var(--lime);box-shadow:0 -6px 0 var(--lime),0 6px 0 var(--lime);transition:box-shadow .2s var(--ease),background .2s var(--ease)}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars{background:var(--orange);box-shadow:0 -6px 0 var(--orange),0 6px 0 var(--orange)}

.site-nav{display:flex;align-items:center}
.nav-list{display:flex;align-items:center;gap:4px}
.nav-link{
  position:relative;display:inline-flex;align-items:center;gap:7px;
  padding:10px 14px;font-size:14px;font-weight:800;letter-spacing:.02em;
  color:rgba(242,245,241,.78);
  transition:color .2s var(--ease),background .2s var(--ease);
}
.nav-idx{font-family:var(--font-mono);font-size:10.5px;font-weight:400;color:var(--fog)}
.nav-link::after{
  content:"";position:absolute;left:14px;right:14px;bottom:5px;height:2px;background:var(--lime);
  transform:scaleX(0);transform-origin:0 50%;transition:transform .22s var(--ease);
}
.nav-link:hover,.nav-link:focus-visible{color:var(--paper);background:var(--pine)}
.nav-link:hover::after,.nav-link:focus-visible::after{transform:scaleX(1)}
.nav-link[aria-current="page"]{background:var(--lime);color:var(--ink)}
.nav-link[aria-current="page"] .nav-idx{color:rgba(10,13,12,.62)}
.nav-link[aria-current="page"]::after{display:none}

/* ---------- 悬浮双触点 ---------- */
.floating-dock{
  position:fixed;right:20px;bottom:calc(24px + env(safe-area-inset-bottom));
  z-index:120;display:flex;align-items:center;gap:8px;
}
.dock-actions{display:flex;align-items:center;gap:8px}
.dock-btn{
  display:inline-flex;align-items:center;gap:8px;height:46px;padding:0 16px;
  font-size:14px;font-weight:800;letter-spacing:.02em;
  background:var(--lime);color:var(--ink);
  clip-path:polygon(12px 0,100% 0,100% calc(100% - 12px),calc(100% - 12px) 100%,0 100%,0 12px);
  animation:dockPulse 2s ease-in-out infinite;
  transition:transform .18s var(--ease);
}
.dock-btn:hover,.dock-btn:focus-visible{transform:translateY(-2px)}
.dock-btn--alt{background:var(--orange);color:#180A03}
.dock-idx{font-size:11px;letter-spacing:.06em;opacity:.62}
.dock-text{white-space:nowrap;overflow:hidden;max-width:120px;transition:max-width .22s var(--ease),opacity .22s var(--ease)}
.dock-toggle{
  width:34px;height:34px;display:grid;place-items:center;
  background:var(--pine);border:1px solid var(--line-strong);color:var(--lime);
  clip-path:polygon(0 0,100% 0,100% calc(100% - 8px),calc(100% - 8px) 100%,0 100%);
}
.dock-chevron{width:9px;height:9px;border-right:2px solid currentColor;border-bottom:2px solid currentColor;transform:rotate(45deg);transition:transform .22s var(--ease)}
.dock-toggle[aria-expanded="false"] .dock-chevron{transform:rotate(-135deg)}
.floating-dock[data-collapsed] .dock-text{max-width:0;opacity:0}
.floating-dock[data-collapsed] .dock-btn{padding:0 12px}

@keyframes dockPulse{
  0%,100%{box-shadow:0 8px 22px rgba(184,255,61,.18)}
  50%{box-shadow:0 10px 32px rgba(184,255,61,.42)}
}

/* ---------- 页脚 ---------- */
.site-footer{
  position:relative;
  background:var(--ink-2);
  border-top:1px solid var(--line-strong);
  padding:56px 0 96px;
  overflow:hidden;
}
.footer-beam{
  position:absolute;top:0;left:0;right:0;height:3px;
  background:repeating-linear-gradient(90deg,var(--lime) 0 26px,transparent 26px 58px,var(--orange) 58px 72px,transparent 72px 118px);
  opacity:.85;
}
.footer-grid{display:grid;grid-template-columns:1.3fr 2fr;gap:44px}
.footer-col{min-width:0}
.footer-col--brand{display:flex;flex-direction:column;gap:18px;align-items:flex-start}
.footer-intro{font-size:15px;line-height:1.75;color:rgba(242,245,241,.76);max-width:44ch}
.footer-note{display:inline-flex;align-items:center;gap:8px;font-family:var(--font-mono);font-size:12px;letter-spacing:.06em;color:var(--fog)}
.note-dot{width:7px;height:7px;background:var(--orange);animation:dockPulse 2s ease-in-out infinite}

.footer-nav{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:24px}
.footer-col-title{margin-bottom:16px;font-family:var(--font-mono);font-size:12.5px;font-weight:400;letter-spacing:.08em;text-transform:uppercase;color:var(--lime)}
.footer-links{display:grid;gap:11px}
.footer-link{display:inline-flex;align-items:center;gap:9px;font-size:15px;font-weight:600;color:rgba(242,245,241,.78);transition:color .2s var(--ease),transform .2s var(--ease)}
.footer-link::before{content:"";flex:0 0 auto;width:6px;height:6px;background:var(--blue);opacity:.6;transition:background .2s var(--ease),opacity .2s var(--ease)}
.footer-link:hover,.footer-link:focus-visible{color:var(--lime);transform:translateX(3px)}
.footer-link:hover::before,.footer-link:focus-visible::before{background:var(--lime);opacity:1}

.footer-wordmark{
  margin-top:44px;
  font-family:var(--font-head);font-weight:900;
  font-size:clamp(48px,12vw,132px);line-height:.86;letter-spacing:-.04em;
  color:rgba(184,255,61,.13);
  user-select:none;
}
@supports (-webkit-text-stroke:1px #000){
  .footer-wordmark{color:transparent;-webkit-text-stroke:1px rgba(184,255,61,.34)}
}

.footer-meta{margin-top:32px;padding-top:20px;border-top:1px dashed var(--line-dash);display:grid;gap:12px}
.footer-contact{display:flex;flex-wrap:wrap;gap:6px 14px;font-size:13.5px;color:var(--fog)}
.meta-item{display:inline-flex;align-items:center;gap:8px}
.meta-key{font-family:var(--font-mono);font-size:11.5px;letter-spacing:.08em;color:rgba(154,163,156,.78)}
.meta-val{color:var(--paper);font-weight:600}
.meta-sep{color:rgba(154,163,156,.45)}
.footer-legal{display:flex;flex-wrap:wrap;gap:8px 14px;font-size:12px;color:var(--fog)}

.to-top{
  position:fixed;left:20px;bottom:calc(24px + env(safe-area-inset-bottom));z-index:120;
  display:inline-flex;align-items:center;gap:9px;padding:11px 15px;
  background:rgba(18,36,28,.94);border:1px solid var(--line-strong);color:var(--paper);
  font-size:12px;letter-spacing:.08em;
  opacity:0;visibility:hidden;transform:translateY(10px);
  transition:opacity .22s var(--ease),transform .22s var(--ease),visibility 0s linear .22s;
}
.to-top.is-visible{opacity:1;visibility:visible;transform:translateY(0);transition-delay:0s}
.to-top-arrow{width:10px;height:10px;border-left:2px solid var(--lime);border-top:2px solid var(--lime);transform:rotate(45deg)}
.to-top-text{color:var(--fog)}

/* ---------- 按钮 ---------- */
.btn{
  display:inline-flex;align-items:center;gap:10px;
  padding:14px 24px;font-size:15px;font-weight:800;letter-spacing:.02em;
  border:1px solid transparent;
  clip-path:polygon(0 0,100% 0,100% calc(100% - 13px),calc(100% - 13px) 100%,0 100%);
  transition:transform .18s var(--ease),background .18s var(--ease),color .18s var(--ease),border-color .18s var(--ease);
}
.btn:hover,.btn:focus-visible{transform:translateY(-2px)}
.btn--lime{background:var(--lime);color:var(--ink)}
.btn--lime:hover{background:#CBFF6E}
.btn--orange{background:var(--orange);color:#180A03}
.btn--ghost{background:transparent;border-color:var(--line-strong);color:var(--paper)}
.btn--ghost:hover{border-color:var(--lime);color:var(--lime)}
.section--paper .btn--ghost{border-color:rgba(10,13,12,.28);color:var(--ink)}
.section--paper .btn--ghost:hover{border-color:var(--lime-dark);color:var(--lime-dark)}
.btn-row{display:flex;flex-wrap:wrap;gap:12px}

/* ---------- 切角面板 ---------- */
.cut-panel{
  position:relative;
  background:var(--pine);
  border:1px solid var(--line);
  padding:24px;
  clip-path:polygon(0 0,calc(100% - var(--cut)) 0,100% var(--cut),100% 100%,var(--cut) 100%,0 calc(100% - var(--cut)));
  transition:transform .2s var(--ease),background .2s var(--ease);
}
.cut-panel--indigo{background:var(--indigo)}
.cut-panel--wine{background:var(--wine);color:var(--wine-text)}
.cut-panel--paper{background:var(--paper);color:var(--ink)}
.cut-panel--link::before{
  content:"";position:absolute;inset:0;clip-path:inherit;
  border:1px solid transparent;pointer-events:none;
  transition:border-color .2s var(--ease);
}
.cut-panel--link:hover{transform:translateY(-2px)}
.cut-panel--link:hover::before{border-color:var(--lime)}
.panel-head{display:flex;align-items:center;gap:12px;margin-bottom:14px}
.panel-idx{font-family:var(--font-mono);font-size:12px;letter-spacing:.08em;color:var(--lime)}
.panel-body{font-size:15px;line-height:1.75;color:rgba(242,245,241,.8)}
.cut-panel--paper .panel-body{color:rgba(10,13,12,.78)}

/* ---------- 坐标索引列表 ---------- */
.idx-list{border-top:1px solid var(--line)}
.idx-item{
  display:flex;align-items:flex-start;gap:16px;
  padding:16px 8px;border-bottom:1px solid var(--line);
  transition:background .2s var(--ease);
}
.idx-item:hover{background:rgba(184,255,61,.06)}
.idx-num{flex:0 0 48px;padding-top:4px;font-family:var(--font-mono);font-size:12px;letter-spacing:.08em;color:var(--lime)}
.idx-body{flex:1 1 auto;min-width:0}
.idx-title{display:block;font-size:17px;font-weight:800;letter-spacing:-.01em;line-height:1.4}
.idx-desc{display:block;margin-top:4px;font-size:14.5px;line-height:1.7;color:var(--fog);max-width:62ch}
.idx-tag{
  flex:0 0 auto;align-self:center;padding:4px 9px;
  font-family:var(--font-mono);font-size:11px;letter-spacing:.06em;(color):var(--blue);
  color:var(--blue);border:1px solid rgba(47,168,255,.35);
}
.tag{display:inline-block;padding:4px 9px;font-family:var(--font-mono);font-size:11px;letter-spacing:.06em;color:var(--lime);border:1px solid var(--line-strong)}

/* ---------- 面包屑 ---------- */
.breadcrumb{margin:22px 0 6px}
.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(--fog)}
.breadcrumb-list li{display:inline-flex;align-items:center;gap:8px}
.breadcrumb-list li+li::before{content:"/";color:rgba(154,163,156,.5)}
.breadcrumb-link{color:var(--fog);transition:color .2s var(--ease)}
.breadcrumb-link:hover,.breadcrumb-link:focus-visible{color:var(--lime)}
.breadcrumb-current{color:var(--paper)}

/* ---------- 正文 ---------- */
.prose{max-width:68ch;font-size:16.5px;line-height:1.75}
.prose>*+*{margin-top:1.2em}
.prose h2{font-size:clamp(22px,3vw,30px);font-weight:900;letter-spacing:-.01em;line-height:1.2;margin-top:1.8em}
.prose h3{font-size:19px;font-weight:800;line-height:1.35;margin-top:1.5em}
.prose ul,.prose ol{display:grid;gap:10px}
.prose li{position:relative;padding-left:20px}
.prose ul li::before{content:"";position:absolute;left:0;top:.62em;width:8px;height:8px;background:var(--lime);clip-path:polygon(0 0,100% 0,100% 72%,72% 100%,0 100%)}
.prose ol{counter-reset:pn}
.prose ol li::before{counter-increment:pn;content:counter(pn,decimal-leading-zero);position:absolute;left:0;top:0;font-family:var(--font-mono);font-size:12px;color:var(--lime)}
.prose a{color:var(--blue);text-decoration:underline;text-underline-offset:3px}
.prose strong{color:var(--lime);font-weight:800}
.prose code{font-family:var(--font-mono);font-size:.94em;padding:2px 6px;background:rgba(184,255,61,.1);color:var(--lime)}
.prose blockquote{border-left:3px solid var(--lime);padding-left:18px;color:rgba(242,245,241,.82)}
.section--paper .prose a{color:#1B6FB8}
.section--paper .prose strong{color:var(--lime-dark)}
.section--paper .prose code{background:rgba(111,158,31,.14);color:#3F6110}
.section--paper .prose ul li::before{background:var(--lime-dark)}
.section--paper .prose ol li::before{color:var(--lime-dark)}

/* ---------- 图片容器（页面阶段放置 <img> 占位） ---------- */
.media{
  position:relative;width:100%;overflow:hidden;
  background:linear-gradient(150deg,var(--pine),var(--ink) 70%);
  border:1px solid var(--line);
  clip-path:polygon(0 0,calc(100% - 20px) 0,100% 20px,100% 100%,0 100%);
}
.media>img{width:100%;height:100%;object-fit:cover}
.media::after{
  content:"";position:absolute;inset:0;z-index:0;pointer-events:none;
  background:linear-gradient(180deg,rgba(10,13,12,0) 46%,rgba(10,13,12,.74));
}
.media--plain::after{display:none}
.media--hero{aspect-ratio:16/10}
.media--wide{aspect-ratio:21/9}
.media--square{aspect-ratio:1/1}
.media--tall{aspect-ratio:3/4}
.media-placeholder{
  position:absolute;inset:0;z-index:1;display:grid;place-items:center;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.2em;text-transform:uppercase;
  color:rgba(184,255,61,.5);
  background-image:linear-gradient(rgba(184,255,61,.07) 1px,transparent 1px),linear-gradient(90deg,rgba(184,255,61,.07) 1px,transparent 1px);
  background-size:36px 36px;
}
.media-caption{margin-top:10px;font-family:var(--font-mono);font-size:12px;letter-spacing:.06em;color:var(--fog)}

/* ---------- 折叠组 ---------- */
.accordion{display:grid;gap:10px;margin-top:24px}
.acc-item{background:var(--pine);border:1px solid var(--line);border-left:3px solid transparent;transition:border-color .2s var(--ease),background .2s var(--ease)}
.acc-item[data-open]{border-left-color:var(--lime);background:var(--pine-2)}
.acc-head{width:100%;display:flex;align-items:center;gap:14px;padding:16px 18px;text-align:left;font-size:16.5px;font-weight:800;letter-spacing:-.01em;color:inherit}
.acc-num{flex:0 0 auto;font-family:var(--font-mono);font-size:12px;letter-spacing:.08em;color:var(--lime)}
.acc-icon{position:relative;flex:0 0 14px;height:14px;margin-left:auto}
.acc-icon::before,.acc-icon::after{content:"";position:absolute;left:0;top:50%;width:14px;height:2px;background:var(--lime);transform:translateY(-50%);transition:transform .22s var(--ease)}
.acc-icon::after{transform:translateY(-50%) rotate(90deg)}
.acc-item[data-open] .acc-icon::after{transform:translateY(-50%) rotate(0deg)}
.acc-body{max-height:0;overflow:hidden;visibility:hidden;transition:max-height .22s var(--ease),visibility 0s linear .22s}
.acc-item[data-open] .acc-body{max-height:var(--acc-max,1200px);visibility:visible;transition:max-height .26s var(--ease),visibility 0s}
.acc-inner{padding:0 18px 20px 18px;font-size:15.5px;line-height:1.75;color:rgba(242,245,241,.8);max-width:66ch}
.section--paper .acc-item{background:rgba(10,13,12,.045);border-color:rgba(10,13,12,.14)}
.section--paper .acc-item[data-open]{background:rgba(10,13,12,.07);border-left-color:var(--lime-dark)}
.section--paper .acc-num{color:var(--lime-dark)}
.section--paper .acc-inner{color:rgba(10,13,12,.78)}

/* ---------- 标签页 ---------- */
.tabs{margin-top:24px}
.tab-list{display:flex;flex-wrap:wrap;gap:8px;padding-bottom:14px;border-bottom:1px solid var(--line)}
.tab{
  padding:8px 16px;font-family:var(--font-mono);font-size:12.5px;letter-spacing:.08em;
  color:var(--fog);border:1px solid var(--line);
  clip-path:polygon(0 0,100% 0,100% calc(100% - 9px),calc(100% - 9px) 100%,0 100%);
  transition:color .2s var(--ease),background .2s var(--ease),border-color .2s var(--ease);
}
.tab:hover{color:var(--lime);border-color:var(--line-strong)}
.tab[aria-selected="true"]{background:var(--lime);border-color:var(--lime);color:var(--ink)}
.tab-panel{padding-top:22px}
.tab-panel[hidden]{display:none}

/* ---------- 入场动效 ---------- */
[data-reveal]{opacity:0;transform:translateY(16px);transition:opacity .5s var(--ease),transform .5s var(--ease);transition-delay:var(--reveal-delay,0ms)}
[data-reveal].is-in{opacity:1;transform:none}

/* ---------- 焦点可见 ---------- */
:focus-visible{outline:2px solid var(--lime);outline-offset:3px}
.section--paper :focus-visible,.cut-panel--paper :focus-visible{outline-color:var(--wine)}

/* ---------- 响应式 ---------- */
@media (max-width:1080px){
  .grid--4{grid-template-columns:repeat(2,minmax(0,1fr))}
}
@media (max-width:960px){
  .header-coord{display:none}
  .nav-toggle{display:inline-flex}
  .site-nav{
    position:fixed;top:var(--header-h,112px);left:0;right:0;bottom:0;z-index:99;
    display:block;
    background:linear-gradient(180deg,var(--ink-2),var(--ink) 82%);
    border-top:2px solid var(--lime);
    padding:16px 20px calc(132px + env(safe-area-inset-bottom));
    overflow-y:auto;
    opacity:0;visibility:hidden;transform:translateY(-10px);pointer-events:none;
    transition:opacity .22s var(--ease),transform .22s var(--ease),visibility 0s linear .22s;
  }
  .site-nav[data-open]{opacity:1;visibility:visible;transform:translateY(0);pointer-events:auto;transition-delay:0s}
  .nav-list{flex-direction:column;align-items:stretch;gap:0}
  .nav-link{
    width:100%;justify-content:flex-start;gap:14px;
    padding:18px 6px;font-size:22px;font-weight:900;
    border-bottom:1px solid var(--line);background:transparent;
  }
  .nav-link::after{display:none}
  .nav-idx{font-size:12px;color:var(--lime)}
  .nav-link:hover,.nav-link:focus-visible{background:transparent;color:var(--lime)}
  .nav-link[aria-current="page"]{background:transparent;color:var(--lime);box-shadow:inset 3px 0 0 var(--lime);padding-left:14px}
  .nav-link[aria-current="page"] .nav-idx{color:var(--lime)}
  .grid--3{grid-template-columns:repeat(2,minmax(0,1fr))}
  .footer-grid{grid-template-columns:1fr;gap:34px}
  .footer-wordmark{margin-top:32px}
}
@media (max-width:720px){
  .header-quick{display:none}
  .section{padding:52px 0}
  .floating-dock{right:14px;bottom:calc(18px + env(safe-area-inset-bottom));gap:6px}
  .dock-toggle{display:none}
  .dock-btn{height:44px;padding:0 13px;font-size:13px;gap:6px}
  .to-top{left:14px;bottom:calc(18px + env(safe-area-inset-bottom));padding:12px 13px}
  .to-top-text{display:none}
  .footer-nav{grid-template-columns:1fr;gap:28px}
  .footer-meta{margin-top:26px}
}
@media (max-width:620px){
  .grid--2,.grid--3,.grid--4{grid-template-columns:minmax(0,1fr)}
  .idx-item{flex-wrap:wrap;gap:10px}
  .idx-num{flex:0 0 34px}
  .idx-tag{align-self:flex-start;margin-left:34px}
  .cut-panel{padding:20px}
  .prose{font-size:15.5px;line-height:1.72}
}

/* ---------- 无障碍：减少动态 ---------- */
@media (prefers-reduced-motion: reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
    transition-delay:0ms !important;
  }
  [data-reveal]{opacity:1 !important;transform:none !important}
  .dock-btn,.note-dot{animation:none !important}
  .acc-body{max-height:none;visibility:visible}
  .acc-item:not([data-open]) .acc-body{display:none}
}