/* ============================================================
   聚星CN · /assets/site.css
   共享外壳：reset / tokens / 中文排版 / 页头 / 页脚 / 基础组件
   设计语言：被点亮的坐标网格 · 等宽索引层 · 切角面板 · 轨道节点
   ============================================================ */

/* ---------- 1. reset ---------- */
*,*::before,*::after{box-sizing:border-box}
html,body,h1,h2,h3,h4,h5,h6,p,figure,blockquote,dl,dd,ul,ol{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}
table{border-collapse:collapse;width:100%}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{min-height:100vh}

/* ---------- 2. tokens ---------- */
:root{
  --void:#0B1020;
  --void-deep:#070B16;
  --violet:#4B3FBF;
  --violet-soft:#8E86F0;
  --gold:#D9A441;
  --cyan:#3FE0C8;
  --paper:#F2EFE6;
  --stone:#5C6472;
  --clay:#C2664A;
  --moss:#7C9A6B;

  --text-1:#EDEBF4;
  --text-2:#A6ACC6;
  --text-3:#7A809B;

  --line:rgba(142,134,240,.26);
  --line-strong:rgba(142,134,240,.5);

  --font-head:'Noto Sans SC','Source Han Sans SC',system-ui,-apple-system,'Segoe UI',sans-serif;
  --font-body:'Noto Serif SC','Songti SC','SimSun',serif;
  --font-mono:'JetBrains Mono','IBM Plex Mono',ui-monospace,'SFMono-Regular',Menlo,monospace;

  --capsule:999px;
  --shell:1280px;
  --gutter:clamp(16px,3vw,32px);
  --ease:cubic-bezier(.22,1,.36,1);
  --dur:.32s;
}

/* ---------- 3. 基底排版 ---------- */
body{
  background-color:var(--void);
  background-image:
    linear-gradient(rgba(142,134,240,.045) 1px,transparent 1px),
    linear-gradient(90deg,rgba(142,134,240,.045) 1px,transparent 1px);
  background-size:72px 72px;
  color:var(--text-1);
  font-family:var(--font-body);
  font-weight:400;
  font-size:clamp(15px,1.02vw,16.5px);
  line-height:1.85;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
h1,h2,h3,h4,h5{font-family:var(--font-head);font-weight:800;line-height:1.16;letter-spacing:-.01em}
.mono{font-family:var(--font-mono);font-weight:500;letter-spacing:.04em}
#main-content{display:block;scroll-margin-top:96px}

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

/* ---------- 4. 跳过链接 ---------- */
.skip-link{
  position:fixed;
  left:16px;
  top:-84px;
  z-index:300;
  padding:11px 20px;
  background:var(--gold);
  color:var(--void);
  font-family:var(--font-head);
  font-weight:700;
  font-size:.84rem;
  text-decoration:none;
  clip-path:polygon(9px 0,100% 0,100% calc(100% - 9px),calc(100% - 9px) 100%,0 100%,0 9px);
  transition:top .2s var(--ease);
}
.skip-link:focus{top:14px}

/* ---------- 5. 容器与网格 ---------- */
.container{
  width:100%;
  max-width:var(--shell);
  margin-inline:auto;
  padding-inline:var(--gutter);
}
.container--narrow{max-width:880px}
.section{padding-block:clamp(48px,7vw,110px)}
.section--tight{padding-block:clamp(28px,4vw,56px)}
.section--paper{
  --text-1:#141826;
  --text-2:#4A4F63;
  --text-3:#6C7286;
  --line:rgba(92,100,114,.3);
  --line-strong:rgba(75,63,191,.45);
  background:var(--paper);
  color:var(--text-1);
}
.section--paper .eyebrow{color:var(--violet)}
.section--paper .btn--ghost{border-color:rgba(75,63,191,.5);color:#141826}
.section--paper .btn--ghost:hover{border-color:var(--violet);color:var(--violet);background:rgba(75,63,191,.06)}
.section--paper .tag{border-color:rgba(92,100,114,.4);color:#4A4F63}
.section__head{
  display:flex;
  flex-wrap:wrap;
  align-items:flex-end;
  justify-content:space-between;
  gap:16px 32px;
  margin-bottom:clamp(22px,3vw,40px);
}
.grid{display:grid;gap:clamp(16px,2vw,28px)}
.grid--12{grid-template-columns:repeat(12,minmax(0,1fr))}
.grid__col--wide{grid-column:3/11}
.grid__col--left{grid-column:1/8}
.grid__col--right{grid-column:8/13}
.grid__col--full{grid-column:1/-1}

/* ---------- 6. 通用标题与文本 ---------- */
.eyebrow{
  display:inline-flex;
  align-items:center;
  gap:10px;
  font-family:var(--font-mono);
  font-weight:500;
  font-size:.7rem;
  letter-spacing:.2em;
  text-transform:uppercase;
  color:var(--gold);
}
.eyebrow::before{content:"";width:22px;height:1px;background:currentColor;opacity:.85}
.display-1{
  font-family:var(--font-head);
  font-weight:900;
  font-size:clamp(2.4rem,7vw,5.2rem);
  line-height:1;
  letter-spacing:-.035em;
}
.display-2{
  font-family:var(--font-head);
  font-weight:800;
  font-size:clamp(1.8rem,4.2vw,3.2rem);
  line-height:1.1;
  letter-spacing:-.02em;
}
.section__title{
  font-family:var(--font-head);
  font-weight:800;
  font-size:clamp(1.5rem,3.2vw,2.6rem);
  line-height:1.16;
  color:var(--text-1);
}
.lede{
  font-size:clamp(1rem,1.15vw,1.12rem);
  line-height:1.9;
  color:var(--text-2);
  max-width:64ch;
}
.prose{max-width:74ch;font-size:1rem;line-height:1.9;color:var(--text-2)}
.prose h2,.prose h3{color:var(--text-1);margin:1.7em 0 .55em}
.prose h2{font-size:clamp(1.3rem,2.2vw,1.8rem)}
.prose h3{font-size:1.08rem}
.prose p+p{margin-top:1.05em}
.prose ul{margin:1em 0}
.prose li{position:relative;padding-left:20px;margin-bottom:.5em}
.prose li::before{content:"—";position:absolute;left:0;color:var(--gold)}
.prose a{color:var(--violet-soft);text-decoration:underline;text-underline-offset:3px}

/* ---------- 7. 按钮 ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:9px;
  padding:13px 22px;
  font-family:var(--font-head);
  font-weight:700;
  font-size:.9rem;
  letter-spacing:.02em;
  text-decoration:none;
  border:1px solid transparent;
  cursor:pointer;
  clip-path:polygon(11px 0,100% 0,100% calc(100% - 11px),calc(100% - 11px) 100%,0 100%,0 11px);
  transition:background .22s var(--ease),color .22s var(--ease),border-color .22s var(--ease);
}
.btn:focus-visible{outline:none;box-shadow:inset 0 0 0 2px var(--cyan)}
.btn--gold{background:var(--gold);color:var(--void)}
.btn--gold:hover{background:#EAB955}
.btn--violet{background:var(--violet);color:#fff}
.btn--violet:hover{background:var(--violet-soft);color:var(--void)}
.btn--ghost{border-color:var(--line-strong);color:var(--text-1);background:transparent}
.btn--ghost:hover{border-color:var(--gold);color:var(--gold)}
.btn--sm{padding:9px 15px;font-size:.8rem}

/* ---------- 8. 切角面板与容器 ---------- */
.bevel{
  position:relative;
  padding:clamp(18px,2.2vw,30px);
  background:rgba(142,134,240,.07);
  border:1px solid var(--line);
  clip-path:polygon(0 0,calc(100% - 22px) 0,100% 22px,100% 100%,22px 100%,0 calc(100% - 22px));
}
.bevel--alt{clip-path:polygon(22px 0,100% 0,100% 100%,0 100%,0 22px)}
.bevel--gold{border-color:rgba(217,164,65,.45);background:rgba(217,164,65,.06)}
.bevel--paper{background:var(--paper);border-color:rgba(92,100,114,.28);color:#141826}
.panel{
  padding:clamp(18px,2.2vw,30px);
  background:rgba(142,134,240,.05);
  border:1px solid var(--line);
}
.panel--paper{background:var(--paper);border-color:rgba(92,100,114,.28);color:#141826}
.grain{position:relative}
.grain::after{
  content:"";
  position:absolute;
  inset:0;
  pointer-events:none;
  background-image:radial-gradient(rgba(242,239,230,.055) 1px,transparent 1px);
  background-size:3px 3px;
}

/* ---------- 9. 标签与状态 ---------- */
.tag{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:3px 9px;
  font-family:var(--font-mono);
  font-weight:500;
  font-size:.68rem;
  letter-spacing:.08em;
  border:1px solid var(--line);
  color:var(--text-2);
  white-space:nowrap;
}
.tag--gold{border-color:rgba(217,164,65,.5);color:var(--gold);background:rgba(217,164,65,.08)}
.tag--cyan{border-color:rgba(63,224,200,.45);color:var(--cyan);background:rgba(63,224,200,.07)}
.tag--moss{border-color:rgba(124,154,107,.5);color:var(--moss);background:rgba(124,154,107,.08)}
.tag--clay{border-color:rgba(194,102,74,.55);color:var(--clay);background:rgba(194,102,74,.08)}
.status-dot{
  display:inline-block;
  flex:none;
  width:7px;
  height:7px;
  border-radius:50%;
  background:var(--cyan);
  box-shadow:0 0 0 3px rgba(63,224,200,.16);
}
.status-dot--gold{background:var(--gold);box-shadow:0 0 0 3px rgba(217,164,65,.16)}
.status-dot--clay{background:var(--clay);box-shadow:0 0 0 3px rgba(194,102,74,.16)}

/* ---------- 10. 图例与轨道 ---------- */
.legend{
  display:flex;
  flex-wrap:wrap;
  gap:10px 22px;
  font-family:var(--font-mono);
  font-size:.7rem;
  letter-spacing:.06em;
  color:var(--text-2);
}
.legend__item{display:inline-flex;align-items:center;gap:8px}
.legend__swatch{flex:none;width:16px;height:3px;background:var(--violet-soft)}
.legend__swatch--gold{background:var(--gold)}
.legend__swatch--cyan{background:var(--cyan)}
.legend__swatch--clay{background:var(--clay)}
.legend__swatch--moss{background:var(--moss)}
.rail{position:relative;display:flex;flex-wrap:wrap}
.rail__node{
  position:relative;
  flex:1 1 0;
  min-width:118px;
  padding:28px 14px 0 0;
  font-family:var(--font-mono);
  font-size:.7rem;
  letter-spacing:.06em;
  color:var(--text-3);
}
.rail__node::before{
  content:"";
  position:absolute;
  left:0;
  top:16px;
  width:9px;
  height:9px;
  border-radius:50%;
  background:var(--void);
  border:1px solid var(--stone);
  transition:background .24s var(--ease),border-color .24s var(--ease),box-shadow .24s var(--ease);
}
.rail__node::after{
  content:"";
  position:absolute;
  left:16px;
  right:0;
  top:20px;
  height:1px;
  background:rgba(92,100,114,.5);
}
.rail__node:last-child::after{display:none}
.rail__node[data-state="done"]::before{background:var(--gold);border-color:var(--gold)}
.rail__node[data-state="done"]::after{background:rgba(217,164,65,.55)}
.rail__node[data-state="active"]::before{background:var(--cyan);border-color:var(--cyan);box-shadow:0 0 0 4px rgba(63,224,200,.18)}
.rail__label{display:block;color:var(--text-1);font-size:.78rem;margin-top:2px}

/* ---------- 11. 参数表 ---------- */
.param-table__wrap{overflow-x:auto;border:1px solid var(--line)}
.param-table{
  width:100%;
  font-family:var(--font-mono);
  font-weight:500;
  font-size:.8rem;
  letter-spacing:.03em;
}
.param-table caption{
  text-align:left;
  font-family:var(--font-mono);
  font-size:.7rem;
  letter-spacing:.16em;
  text-transform:uppercase;
  color:var(--gold);
  padding-bottom:10px;
}
.param-table th,.param-table td{
  padding:11px 14px;
  text-align:left;
  vertical-align:top;
  border-bottom:1px solid rgba(92,100,114,.4);
}
.param-table thead th{
  color:var(--text-1);
  font-weight:500;
  white-space:nowrap;
  background:rgba(142,134,240,.07);
  border-bottom-color:var(--line-strong);
}
.param-table tbody tr{transition:background .18s var(--ease)}
.param-table tbody tr:hover{background:rgba(142,134,240,.08)}
.param-table td:first-child{color:var(--gold);white-space:nowrap}
.section--paper .param-table thead th{color:#141826;background:rgba(75,63,191,.08);border-bottom-color:rgba(75,63,191,.4)}
.section--paper .param-table th,
.section--paper .param-table td{border-bottom-color:rgba(92,100,114,.28)}
.section--paper .param-table td:first-child{color:var(--violet)}
.section--paper .param-table__wrap{border-color:rgba(92,100,114,.28)}

/* ---------- 12. 面包屑 ---------- */
.breadcrumb{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:8px;
  padding-block:18px 0;
  font-family:var(--font-mono);
  font-size:.72rem;
  letter-spacing:.08em;
  color:var(--text-3);
}
.breadcrumb a{color:var(--text-3);text-decoration:none;transition:color .2s var(--ease)}
.breadcrumb a:hover{color:var(--gold)}
.breadcrumb__sep{color:var(--stone)}
.breadcrumb [aria-current="page"]{color:var(--text-1)}

/* ---------- 13. 图片容器 ---------- */
.media-frame{
  position:relative;
  overflow:hidden;
  background:rgba(142,134,240,.08);
  border:1px solid var(--line);
  clip-path:polygon(0 0,calc(100% - 24px) 0,100% 24px,100% 100%,24px 100%,0 calc(100% - 24px));
}
.media-frame img,.media-frame video,.media-frame svg{width:100%;height:100%;object-fit:cover}
.media-frame::after{
  content:"";
  position:absolute;
  inset:0;
  pointer-events:none;
  background:linear-gradient(180deg,rgba(11,16,32,0) 58%,rgba(11,16,32,.5) 100%);
}
.media-frame--plain::after{background:none}
.media-frame--wide{aspect-ratio:16/9}
.media-frame--tall{aspect-ratio:3/4}
.media-frame--square{aspect-ratio:1/1}
.media-frame--micro{aspect-ratio:4/3}
.media-frame__caption{
  margin-top:10px;
  font-family:var(--font-mono);
  font-size:.7rem;
  letter-spacing:.06em;
  color:var(--text-3);
}

/* ---------- 14. 页头 ---------- */
.site-header{
  position:sticky;
  top:0;
  z-index:80;
  padding:12px var(--gutter) 0;
  pointer-events:none;
  transition:padding .3s var(--ease);
}
.site-header[data-shrunk]{padding-top:6px}
.nav-capsule{
  pointer-events:auto;
  position:relative;
  max-width:var(--shell);
  margin-inline:auto;
  display:grid;
  grid-template-columns:auto 1fr auto;
  align-items:center;
  gap:clamp(8px,1.5vw,20px);
  padding:7px 8px 7px 12px;
  background:rgba(12,17,36,.86);
  border:1px solid var(--line);
  border-radius:var(--capsule);
  -webkit-backdrop-filter:blur(16px) saturate(150%);
  backdrop-filter:blur(16px) saturate(150%);
  box-shadow:0 18px 40px -30px rgba(0,0,0,.9);
  transition:background .3s var(--ease),border-color .3s var(--ease);
}
.site-header[data-shrunk] .nav-capsule{padding-block:5px;background:rgba(10,14,30,.95)}

.brand{
  display:inline-flex;
  align-items:center;
  gap:9px;
  text-decoration:none;
  color:var(--text-1);
  font-family:var(--font-head);
  font-weight:800;
  font-size:.98rem;
  letter-spacing:.02em;
  white-space:nowrap;
}
.brand__mark{
  display:inline-block;
  padding:5px 7px 4px;
  background:var(--gold);
  color:var(--void);
  font-family:var(--font-mono);
  font-weight:500;
  font-size:.62rem;
  letter-spacing:.06em;
  line-height:1;
  clip-path:polygon(6px 0,100% 0,100% calc(100% - 6px),calc(100% - 6px) 100%,0 100%,0 6px);
  transition:background .22s var(--ease);
}
.brand__name{line-height:1}
.brand:hover .brand__mark{background:var(--cyan)}

.nav-track{justify-self:center;min-width:0}
.nav-track__list{display:flex;align-items:center;gap:2px}
.nav-track__link{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:8px 11px;
  border-radius:var(--capsule);
  border:1px solid transparent;
  text-decoration:none;
  color:var(--text-2);
  font-family:var(--font-head);
  font-weight:500;
  font-size:.82rem;
  white-space:nowrap;
  transition:color .2s var(--ease),background .2s var(--ease),border-color .2s var(--ease);
}
.nav-track__num{
  font-family:var(--font-mono);
  font-weight:500;
  font-size:.6rem;
  letter-spacing:.06em;
  color:var(--stone);
  transition:color .2s var(--ease);
}
.nav-track__link:hover{color:var(--text-1);background:rgba(142,134,240,.14)}
.nav-track__link:hover .nav-track__num{color:var(--violet-soft)}
.nav-track__link[aria-current="page"]{
  color:var(--gold);
  border-color:rgba(217,164,65,.55);
  background:rgba(217,164,65,.08);
}
.nav-track__link[aria-current="page"] .nav-track__num{color:var(--gold)}

.nav-actions{display:flex;align-items:center;gap:8px}
.nav-cta{
  display:inline-flex;
  align-items:center;
  gap:7px;
  padding:9px 15px;
  border-radius:var(--capsule);
  background:var(--violet);
  border:1px solid rgba(142,134,240,.6);
  color:#fff;
  text-decoration:none;
  font-family:var(--font-head);
  font-weight:700;
  font-size:.82rem;
  letter-spacing:.02em;
  white-space:nowrap;
  transition:background .2s var(--ease),color .2s var(--ease),border-color .2s var(--ease);
}
.nav-cta__num{font-family:var(--font-mono);font-weight:500;font-size:.6rem;letter-spacing:.06em;opacity:.72}
.nav-cta:hover{background:var(--violet-soft);color:var(--void);border-color:var(--violet-soft)}
.nav-toggle{
  display:none;
  align-items:center;
  gap:8px;
  padding:9px 13px;
  border:1px solid var(--line);
  border-radius:var(--capsule);
  color:var(--text-1);
  font-family:var(--font-mono);
  font-weight:500;
  font-size:.72rem;
  letter-spacing:.08em;
  transition:border-color .2s var(--ease);
}
.nav-toggle:hover{border-color:var(--violet-soft)}
.nav-toggle__bars{position:relative;display:inline-block;width:14px;height:2px;background:currentColor;transition:background .2s var(--ease)}
.nav-toggle__bars::before,.nav-toggle__bars::after{
  content:"";
  position:absolute;
  left:0;
  width:14px;
  height:2px;
  background:currentColor;
  transition:transform .24s var(--ease),top .24s var(--ease);
}
.nav-toggle__bars::before{top:-5px}
.nav-toggle__bars::after{top:5px}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars{background:transparent}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::before{top:0;transform:rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::after{top:0;transform:rotate(-45deg)}

/* ---------- 15. 页脚 ---------- */
.site-footer{
  position:relative;
  margin-top:clamp(56px,8vw,120px);
  background:var(--void-deep);
  border-top:1px solid var(--line-strong);
  color:var(--text-2);
}
.footer-band{
  max-width:var(--shell);
  margin-inline:auto;
  padding:clamp(40px,5vw,72px) var(--gutter) clamp(20px,3vw,32px);
}
.footer-band__grid{
  display:grid;
  grid-template-columns:minmax(0,1.15fr) minmax(0,1.4fr) minmax(0,1fr);
  gap:clamp(24px,3.2vw,56px);
  align-items:start;
}
.footer-seg{min-width:0}
.footer-seg__label{
  display:flex;
  align-items:center;
  gap:8px;
  margin-bottom:16px;
  font-family:var(--font-mono);
  font-weight:500;
  font-size:.68rem;
  letter-spacing:.18em;
  text-transform:uppercase;
  color:var(--violet-soft);
}
.footer-seg__label span{color:var(--gold)}
.footer-brand{
  font-family:var(--font-head);
  font-weight:900;
  font-size:clamp(1.5rem,2.2vw,2rem);
  line-height:1.1;
  letter-spacing:-.02em;
  color:var(--paper);
}
.footer-brand__en{
  margin:8px 0 18px;
  font-family:var(--font-mono);
  font-weight:500;
  font-size:.72rem;
  letter-spacing:.1em;
  color:var(--stone);
}
.footer-contact{
  display:grid;
  grid-template-columns:auto minmax(0,1fr);
  gap:10px;
  margin-bottom:8px;
  font-size:.86rem;
}
.footer-contact__k{
  padding-top:.35em;
  font-family:var(--font-mono);
  font-weight:500;
  font-size:.68rem;
  letter-spacing:.1em;
  color:var(--stone);
  white-space:nowrap;
}
.footer-contact__v{
  color:var(--text-1);
  font-family:var(--font-mono);
  font-weight:500;
  font-size:.78rem;
  letter-spacing:.02em;
  word-break:break-word;
}
.footer-note{max-width:42ch;font-size:.82rem;line-height:1.8;color:var(--text-3)}
.footer-rail{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:4px 20px}
.footer-rail a{
  position:relative;
  display:inline-block;
  padding:5px 0 5px 17px;
  font-size:.88rem;
  color:var(--text-2);
  text-decoration:none;
  transition:color .2s var(--ease);
}
.footer-rail a::before{
  content:"";
  position:absolute;
  left:0;
  top:1em;
  width:7px;
  height:1px;
  background:var(--stone);
  transition:width .22s var(--ease),background .22s var(--ease);
}
.footer-rail a:hover{color:var(--paper)}
.footer-rail a:hover::before{width:12px;background:var(--gold)}
.footer-rail a:focus-visible::before{background:var(--cyan)}
.footer-stamp{
  display:inline-flex;
  align-items:center;
  gap:8px;
  margin-top:18px;
  padding:7px 12px;
  border:1px solid rgba(63,224,200,.35);
  color:var(--cyan);
  font-size:.68rem;
  letter-spacing:.14em;
  clip-path:polygon(8px 0,100% 0,100% calc(100% - 8px),calc(100% - 8px) 100%,0 100%,0 8px);
}
.footer-icp{margin-top:14px;font-size:.72rem;letter-spacing:.08em;color:var(--text-3)}
.footer-base{
  display:flex;
  flex-wrap:wrap;
  justify-content:space-between;
  gap:10px 24px;
  margin-top:clamp(32px,4vw,56px);
  padding-top:18px;
  border-top:1px solid rgba(92,100,114,.35);
  font-size:.76rem;
  color:var(--text-3);
}
.footer-base .mono{letter-spacing:.08em}

/* ---------- 16. 抽屉 ---------- */
.drawer{position:fixed;inset:0;z-index:120;display:none}
.drawer[data-open]{display:block}
.drawer__backdrop{
  position:absolute;
  inset:0;
  background:rgba(7,11,22,.74);
  -webkit-backdrop-filter:blur(3px);
  backdrop-filter:blur(3px);
  animation:jx-fade .24s var(--ease);
}
.drawer__panel{
  position:absolute;
  top:0;
  right:0;
  height:100%;
  width:min(520px,100%);
  display:flex;
  flex-direction:column;
  overflow-y:auto;
  background:var(--void);
  border-left:1px solid var(--line-strong);
  box-shadow:-30px 0 60px -40px rgba(0,0,0,.95);
  animation:jx-slide .32s var(--ease);
}
@keyframes jx-fade{from{opacity:0}to{opacity:1}}
@keyframes jx-slide{from{transform:translateX(100%)}to{transform:none}}
.drawer__head{
  position:sticky;
  top:0;
  z-index:2;
  display:flex;
  align-items:flex-start;
  justify-content:space-between;
  gap:16px;
  padding:20px clamp(18px,3vw,28px);
  background:rgba(11,16,32,.96);
  border-bottom:1px solid var(--line);
  -webkit-backdrop-filter:blur(10px);
  backdrop-filter:blur(10px);
}
.drawer__eyebrow{
  display:block;
  margin-bottom:6px;
  font-family:var(--font-mono);
  font-weight:500;
  font-size:.66rem;
  letter-spacing:.18em;
  text-transform:uppercase;
  color:var(--gold);
}
.drawer__title{font-family:var(--font-head);font-weight:800;font-size:1.18rem;color:var(--text-1)}
.drawer__close{
  flex:none;
  display:inline-flex;
  align-items:center;
  justify-content:center;
  width:34px;
  height:34px;
  border:1px solid var(--line);
  border-radius:50%;
  color:var(--text-1);
  font-family:var(--font-mono);
  font-size:.9rem;
  line-height:1;
  transition:border-color .2s var(--ease),color .2s var(--ease);
}
.drawer__close:hover{border-color:var(--clay);color:var(--clay)}
.drawer__body{padding:clamp(18px,3vw,28px)}
.drawer__body > * + *{margin-top:18px}
body.is-drawer-open,
body.is-nav-open{overflow:hidden}

/* ---------- 17. 筛选标签 ---------- */
.filter-rail{display:flex;flex-wrap:wrap;align-items:center;gap:8px}
.filter-chip{
  display:inline-flex;
  align-items:center;
  gap:8px;
  padding:8px 14px;
  border:1px solid var(--line);
  border-radius:var(--capsule);
  color:var(--text-2);
  font-family:var(--font-mono);
  font-weight:500;
  font-size:.72rem;
  letter-spacing:.08em;
  transition:border-color .2s var(--ease),color .2s var(--ease),background .2s var(--ease);
}
.filter-chip:hover{color:var(--text-1);border-color:var(--line-strong)}
.filter-chip[aria-pressed="true"]{color:var(--gold);border-color:var(--gold);background:rgba(217,164,65,.1)}
.filter-count{
  margin-left:auto;
  font-family:var(--font-mono);
  font-weight:500;
  font-size:.72rem;
  letter-spacing:.08em;
  color:var(--text-3);
}
[data-filter-count]{color:var(--cyan)}
[data-filter-item][data-filtered-out]{display:none}

/* ---------- 18. 展开组 ---------- */
.disclosure{border-top:1px solid var(--line)}
.disclosure:last-child{border-bottom:1px solid var(--line)}
.disclosure__trigger{
  display:flex;
  align-items:center;
  gap:16px;
  width:100%;
  padding:20px 4px;
  text-align:left;
  font-family:var(--font-head);
  font-weight:700;
  font-size:1rem;
  color:var(--text-1);
  transition:color .2s var(--ease);
}
.disclosure__trigger:hover{color:var(--gold)}
.disclosure__trigger[aria-expanded="true"]{color:var(--gold)}
.disclosure__num{
  flex:none;
  font-family:var(--font-mono);
  font-weight:500;
  font-size:.72rem;
  letter-spacing:.1em;
  color:var(--stone);
}
.disclosure__icon{position:relative;flex:none;width:14px;height:14px;margin-left:auto}
.disclosure__icon::before,.disclosure__icon::after{
  content:"";
  position:absolute;
  background:var(--gold);
  transition:transform .24s var(--ease),opacity .24s var(--ease);
}
.disclosure__icon::before{left:0;top:6.5px;width:14px;height:1px}
.disclosure__icon::after{top:0;left:6.5px;width:1px;height:14px}
.disclosure__trigger[aria-expanded="true"] .disclosure__icon::after{transform:scaleY(0);opacity:0}
.disclosure__panel{display:none;padding:0 4px 24px}
.disclosure__panel[data-open]{display:block}

/* ---------- 19. 章节索引 ---------- */
.toc-index{display:flex;flex-direction:column;gap:2px}
.toc-index__link{
  display:block;
  padding:8px 10px 8px 12px;
  border-left:2px solid transparent;
  font-family:var(--font-mono);
  font-weight:500;
  font-size:.72rem;
  letter-spacing:.06em;
  color:var(--text-3);
  text-decoration:none;
  transition:color .2s var(--ease),border-color .2s var(--ease);
}
.toc-index__link:hover{color:var(--text-1)}
.toc-index__link[data-active]{color:var(--gold);border-left-color:var(--gold)}

/* ---------- 20. 进度与显现 ---------- */
.scroll-progress{
  position:fixed;
  top:0;
  left:0;
  right:0;
  height:2px;
  z-index:200;
  transform:scaleX(0);
  transform-origin:0 50%;
  pointer-events:none;
  background:linear-gradient(90deg,var(--violet),var(--violet-soft),var(--gold));
}
[data-reveal]{transition:opacity var(--dur) var(--ease),transform var(--dur) var(--ease)}
html.has-js [data-reveal]{opacity:0;transform:translateY(16px)}
html.has-js [data-reveal].is-in{opacity:1;transform:none}

/* ---------- 21. 返回顶部 ---------- */
.back-to-top{
  position:fixed;
  right:clamp(14px,2.5vw,28px);
  bottom:clamp(14px,2.5vw,28px);
  z-index:110;
  display:inline-flex;
  align-items:center;
  justify-content:center;
  width:44px;
  height:44px;
  border:1px solid var(--line-strong);
  border-radius:50%;
  background:rgba(12,17,36,.92);
  color:var(--gold);
  font-family:var(--font-mono);
  font-size:.8rem;
  opacity:0;
  visibility:hidden;
  transform:translateY(10px);
  -webkit-backdrop-filter:blur(10px);
  backdrop-filter:blur(10px);
  transition:opacity .28s var(--ease),transform .28s var(--ease),visibility .28s,border-color .2s var(--ease);
}
.back-to-top[data-visible]{opacity:1;visibility:visible;transform:none}
.back-to-top:hover{border-color:var(--gold)}

/* ---------- 22. 响应式 ---------- */
@media (max-width:1180px){
  .nav-track__num{display:none}
  .nav-track__link{padding-inline:9px;font-size:.78rem}
  .nav-cta{padding-inline:12px}
}
@media (max-width:1024px){
  .footer-band__grid{grid-template-columns:minmax(0,1fr) minmax(0,1fr)}
  .footer-seg:first-child{grid-column:1/-1}
}
@media (max-width:900px){
  .site-header{padding-inline:12px}
  .nav-capsule{grid-template-columns:auto 1fr auto;border-radius:22px}
  .nav-toggle{display:inline-flex}
  .nav-cta{display:none}
  .nav-track{
    position:absolute;
    top:calc(100% + 10px);
    left:0;
    right:0;
    display:none;
    padding:10px;
    background:rgba(12,17,36,.97);
    border:1px solid var(--line);
    border-radius:20px;
    -webkit-backdrop-filter:blur(16px);
    backdrop-filter:blur(16px);
  }
  .nav-track[data-open]{display:block}
  .nav-track__list{flex-direction:column;align-items:stretch;gap:2px}
  .nav-track__link{padding:11px 14px;font-size:.92rem;border-radius:14px}
  .nav-track__num{display:inline;font-size:.64rem}
  .grid--12{grid-template-columns:repeat(6,minmax(0,1fr))}
  .grid__col--wide,
  .grid__col--left,
  .grid__col--right{grid-column:1/-1}
}
@media (max-width:640px){
  .footer-band__grid{grid-template-columns:minmax(0,1fr)}
  .footer-seg:first-child{grid-column:auto}
  .footer-rail{grid-template-columns:minmax(0,1fr)}
  .rail{flex-direction:column}
  .rail__node{width:100%;padding:24px 0 0 18px}
  .rail__node::before{top:14px}
  .rail__node::after{left:4px;top:26px;bottom:0;right:auto;width:1px;height:auto}
  .rail__node:last-child::after{display:none}
  .filter-count{margin-left:0;width:100%}
}

/* ---------- 23. 面向减弱动效 ---------- */
@media (prefers-reduced-motion: reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
  }
  html.has-js [data-reveal]{opacity:1;transform:none}
  .scroll-progress{display:none}
}