:root{
  --ink-900:#05070E;
  --ink-800:#0B1020;
  --ink-700:#131B30;
  --line:#22304C;
  --mint:#2EE6A8;
  --orange:#FF7A1A;
  --yellow:#FFD24A;
  --text:#EAF0FA;
  --text-2:#93A2BC;
  --text-3:#5B6C8A;
  --rail:0px;
  --font-display:"Archivo Black","Noto Sans SC","Source Han Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,sans-serif;
  --font-sans:"Noto Sans SC","Source Han Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,sans-serif;
  --font-mono:"JetBrains Mono","SFMono-Regular","Roboto Mono",Consolas,"Courier New",monospace;
  --ease:cubic-bezier(.22,.61,.36,1);
  --cut:polygon(0 0, calc(100% - 20px) 0, 100% 20px, 100% 100%, 20px 100%, 0 calc(100% - 20px));
  --cut-sm:polygon(0 0, calc(100% - 12px) 0, 100% 12px, 100% 100%, 12px 100%, 0 calc(100% - 12px));
}

*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body{
  margin:0;
  min-height:100vh;
  background:var(--ink-900);
  color:var(--text);
  font-family:var(--font-sans);
  font-size:16px;
  font-weight:400;
  line-height:1.75;
  letter-spacing:.01em;
  overflow-x:hidden;
}
body::before{
  content:"";
  position:fixed;
  inset:0;
  z-index:0;
  pointer-events:none;
  opacity:.6;
  background-image:radial-gradient(rgba(234,240,250,.05) 1px, transparent 1px);
  background-size:4px 4px;
}
img,svg{display:block;max-width:100%}
h1,h2,h3,h4,p,figure,blockquote{margin:0}
h1,h2,h3,h4{font-weight:800;line-height:1.12;letter-spacing:-.01em}
ul,ol{margin:0;padding:0;list-style:none}
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%}
strong,b{font-weight:700}
::selection{background:rgba(46,230,168,.3);color:#fff}
:focus-visible{outline:2px solid var(--mint);outline-offset:3px;border-radius:2px}

/* ---------- 容器与网格 ---------- */
.shell{width:100%;max-width:1240px;margin-inline:auto;padding-inline:1.1rem}
.site-main{position:relative;z-index:1;padding-top:56px}
.grid{display:grid;gap:1.5rem}
.grid--2{grid-template-columns:repeat(2,minmax(0,1fr))}
.grid--3{grid-template-columns:repeat(3,minmax(0,1fr))}
.grid--split{grid-template-columns:minmax(0,7fr) minmax(0,5fr)}

/* ---------- 字体工具 ---------- */
.label-mono{
  font-family:var(--font-mono);
  font-size:.68rem;
  letter-spacing:.18em;
  text-transform:uppercase;
  color:var(--text-2);
}

/* ---------- 按钮 ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:.5rem;
  padding:.62rem 1.05rem;
  border:1px solid transparent;
  font-family:var(--font-sans);
  font-size:.85rem;
  font-weight:700;
  letter-spacing:.04em;
  line-height:1.2;
  white-space:nowrap;
  cursor:pointer;
  transition:background .18s var(--ease),color .18s var(--ease),border-color .18s var(--ease),transform .18s var(--ease);
}
.btn--primary{background:var(--orange);color:#14060A;clip-path:var(--cut-sm)}
.btn--primary:hover{background:#FF8F3F;transform:translateY(-2px)}
.btn--mint{background:var(--mint);color:var(--ink-900);clip-path:var(--cut-sm)}
.btn--mint:hover{background:#57F0BC;transform:translateY(-2px)}
.btn--ghost{border-color:var(--line);color:var(--text)}
.btn--ghost:hover{border-color:var(--mint);color:var(--mint);transform:translateY(-2px)}

/* ---------- 面板 / 数据 / 标签 ---------- */
.panel{background:var(--ink-700);border:1px solid var(--line);padding:1.5rem}
.panel--cut{position:relative;background:var(--ink-700);border:0;padding:1.6rem;clip-path:var(--cut)}
.panel--cut::before{content:"";position:absolute;inset:0;box-shadow:inset 0 0 0 1px var(--line);pointer-events:none}

.section-tag{
  display:inline-flex;
  align-items:center;
  gap:.7rem;
  padding:.42rem .85rem;
  border:1px solid var(--line);
  background:rgba(11,16,32,.72);
  clip-path:var(--cut-sm);
  font-family:var(--font-mono);
  font-size:.66rem;
  letter-spacing:.2em;
  text-transform:uppercase;
  color:var(--text-2);
}
.section-tag b{color:var(--yellow);font-weight:700}
.tag{
  display:inline-flex;
  align-items:center;
  gap:.5rem;
  font-family:var(--font-mono);
  font-size:.66rem;
  letter-spacing:.18em;
  text-transform:uppercase;
  color:var(--mint);
}
.tag__num{color:var(--yellow)}

.stat{display:flex;flex-direction:column;gap:.3rem;padding:1rem 0;border-top:1px solid var(--line)}
.stat__value{
  font-family:var(--font-mono);
  font-variant-numeric:tabular-nums;
  font-weight:700;
  font-size:clamp(2.4rem,6vw,4.6rem);
  line-height:1;
  letter-spacing:-.02em;
  color:var(--yellow);
}
.stat__value--mint{color:var(--mint)}
.stat__value--orange{color:var(--orange)}
.stat__unit{font-family:var(--font-mono);font-size:.7rem;letter-spacing:.2em;color:var(--text-3)}
.stat__label{font-size:.9rem;color:var(--text-2);line-height:1.6}

.band{
  height:64px;
  background:rgba(46,230,168,.08);
  clip-path:polygon(0 22%, 100% 0, 100% 78%, 0 100%);
  pointer-events:none;
}
.band--orange{background:rgba(255,122,26,.12)}

/* ---------- 章节骨架 ---------- */
.chapter{position:relative;padding:clamp(3rem,7vw,6rem) 0}
.chapter__head{display:grid;gap:1.5rem;grid-template-columns:minmax(0,7fr) minmax(0,5fr);align-items:end}
.chapter__title{font-size:clamp(1.9rem,4vw,3.4rem);font-weight:800;letter-spacing:-.01em;line-height:1.1}
.chapter__lead{color:var(--text-2);max-width:52ch;border-left:2px solid var(--line);padding-left:1rem}

.chapter-index{display:grid;gap:.3rem;font-family:var(--font-mono);font-size:.72rem;letter-spacing:.12em}
.chapter-index__link{
  display:flex;
  align-items:center;
  gap:.6rem;
  padding:.45rem .6rem;
  color:var(--text-3);
  border-left:2px solid var(--line);
  transition:color .18s var(--ease),background .18s var(--ease),border-color .18s var(--ease);
}
.chapter-index__link:hover{color:var(--text);background:rgba(46,230,168,.06)}
.chapter-index__link[aria-current="true"]{color:var(--yellow);border-left-color:var(--orange);background:rgba(255,122,26,.08)}

/* ---------- 图片容器 ---------- */
.media-frame{
  position:relative;
  display:block;
  overflow:hidden;
  background:var(--ink-700);
  border:1px solid var(--line);
}
.media-frame img{width:100%;height:100%;object-fit:cover;transition:transform .6s var(--ease)}
.media-frame:hover img{transform:scale(1.04)}
.media-frame::after{
  content:"";
  position:absolute;
  inset:0;
  background:linear-gradient(180deg, rgba(5,7,14,0) 42%, rgba(5,7,14,.74) 100%);
  pointer-events:none;
}
.media-frame--cut{clip-path:var(--cut)}
.media-frame[data-ratio="21x9"]{aspect-ratio:21/9}
.media-frame[data-ratio="16x9"]{aspect-ratio:16/9}
.media-frame[data-ratio="3x2"]{aspect-ratio:3/2}
.media-frame[data-ratio="4x3"]{aspect-ratio:4/3}
.media-frame[data-ratio="1x1"]{aspect-ratio:1/1}
.media-frame[data-ratio="3x4"]{aspect-ratio:3/4}
.media-frame__caption{
  position:absolute;
  left:1rem;
  bottom:.85rem;
  z-index:2;
  font-family:var(--font-mono);
  font-size:.68rem;
  letter-spacing:.12em;
  color:var(--text);
}

/* ---------- 面包屑 ---------- */
.breadcrumb{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:.5rem;
  font-family:var(--font-mono);
  font-size:.68rem;
  letter-spacing:.14em;
  color:var(--text-3);
}
.breadcrumb li{display:flex;align-items:center;gap:.5rem}
.breadcrumb li+li::before{content:"/";color:var(--line)}
.breadcrumb a:hover{color:var(--mint)}
.breadcrumb [aria-current="page"]{color:var(--text-2)}

/* ---------- 可展开内容组 ---------- */
.disclosure{border:1px solid var(--line);background:var(--ink-800)}
.disclosure+.disclosure{margin-top:.75rem}
.disclosure__btn{
  display:flex;
  width:100%;
  align-items:center;
  justify-content:space-between;
  gap:1rem;
  padding:1.05rem 1.15rem;
  text-align:left;
  font-size:1rem;
  font-weight:700;
  color:var(--text);
  transition:color .18s var(--ease);
}
.disclosure__btn::after{
  content:"";
  flex:none;
  width:8px;
  height:8px;
  border-right:2px solid var(--mint);
  border-bottom:2px solid var(--mint);
  transform:rotate(45deg);
  transition:transform .2s var(--ease);
}
.disclosure__btn:hover{color:var(--mint)}
.disclosure__btn[aria-expanded="true"]{color:var(--mint)}
.disclosure__btn[aria-expanded="true"]::after{transform:rotate(-135deg)}
.disclosure__panel{padding:0 1.15rem 1.15rem;color:var(--text-2);font-size:.95rem;line-height:1.8}
.disclosure__panel[hidden]{display:none}

/* ---------- 口径切换 ---------- */
.tabs{display:inline-flex;border:1px solid var(--line);background:var(--ink-800)}
.tabs__btn{
  padding:.5rem .95rem;
  font-family:var(--font-mono);
  font-size:.7rem;
  letter-spacing:.14em;
  color:var(--text-3);
  transition:color .18s var(--ease),background .18s var(--ease);
}
.tabs__btn:hover{color:var(--text)}
.tabs__btn[aria-selected="true"]{background:rgba(46,230,168,.12);color:var(--mint)}
.tabs__panel[hidden]{display:none}

/* ---------- 跳转链接 ---------- */
.skip-link{
  position:fixed;
  left:.75rem;
  top:.75rem;
  z-index:120;
  padding:.6rem 1rem;
  background:var(--mint);
  color:var(--ink-900);
  font-family:var(--font-mono);
  font-size:.72rem;
  font-weight:700;
  letter-spacing:.14em;
  transform:translateY(-180%);
  transition:transform .18s var(--ease);
}
.skip-link:focus{transform:translateY(0)}

/* ---------- 头部 ---------- */
.site-header{position:relative;z-index:60}
.scroll-progress{position:fixed;top:0;left:0;right:0;height:2px;z-index:90;background:transparent;pointer-events:none}
.scroll-progress__bar{
  display:block;
  height:100%;
  width:0;
  background:linear-gradient(90deg,var(--mint) 0%,var(--yellow) 62%,var(--orange) 100%);
}

.header-bar{
  position:fixed;
  top:0;
  left:0;
  right:0;
  z-index:75;
  display:flex;
  align-items:center;
  gap:1rem;
  height:64px;
  padding:0 1.25rem;
  padding-left:calc(var(--rail) + 1.25rem);
  background:transparent;
  border-bottom:1px solid transparent;
  transition:background .2s var(--ease),border-color .2s var(--ease);
}
.site-header[data-scrolled="true"] .header-bar{
  background:var(--ink-900);
  border-bottom-color:var(--line);
}

.brand{display:flex;align-items:baseline;gap:.55rem;padding:.3rem 0}
.brand__mark{
  font-family:var(--font-display);
  font-size:1.05rem;
  font-weight:900;
  letter-spacing:-.02em;
  color:var(--text);
  white-space:nowrap;
}
.brand__sub{
  font-family:var(--font-mono);
  font-size:.6rem;
  letter-spacing:.24em;
  color:var(--mint);
  border:1px solid rgba(46,230,168,.42);
  padding:.18rem .36rem;
  clip-path:var(--cut-sm);
}
.brand:hover .brand__mark{color:var(--mint)}

.header-bar__tagline{
  font-family:var(--font-mono);
  font-size:.66rem;
  letter-spacing:.2em;
  color:var(--text-3);
  text-transform:uppercase;
  padding-left:1rem;
  margin-left:.25rem;
  border-left:1px solid var(--line);
}
.header-bar__actions{margin-left:auto;display:flex;align-items:center;gap:.7rem}

/* 轮次切换 */
.round-switch{position:relative}
.round-switch__summary{
  display:flex;
  align-items:center;
  gap:.6rem;
  padding:.42rem .72rem;
  border:1px solid var(--line);
  background:rgba(11,16,32,.78);
  clip-path:var(--cut-sm);
  cursor:pointer;
  list-style:none;
  transition:border-color .18s var(--ease);
}
.round-switch__summary::-webkit-details-marker{display:none}
.round-switch__summary::after{
  content:"";
  width:6px;
  height:6px;
  border-right:1.5px solid var(--mint);
  border-bottom:1.5px solid var(--mint);
  transform:rotate(45deg) translate(-1px,-1px);
  transition:transform .2s var(--ease);
}
.round-switch[open] .round-switch__summary{border-color:rgba(46,230,168,.6)}
.round-switch[open] .round-switch__summary::after{transform:rotate(-135deg)}
.round-switch__label{font-family:var(--font-mono);font-size:.58rem;letter-spacing:.18em;color:var(--text-3)}
.round-switch__value{
  font-family:var(--font-mono);
  font-variant-numeric:tabular-nums;
  font-size:.82rem;
  font-weight:700;
  color:var(--yellow);
}
.round-switch__menu{
  position:absolute;
  right:0;
  top:calc(100% + .5rem);
  min-width:9.5rem;
  padding:.35rem;
  display:grid;
  gap:.15rem;
  background:var(--ink-800);
  border:1px solid var(--line);
  z-index:80;
}
.round-switch__opt{
  width:100%;
  padding:.5rem .7rem;
  text-align:left;
  font-family:var(--font-mono);
  font-size:.8rem;
  color:var(--text-2);
  border-left:2px solid transparent;
  transition:background .18s var(--ease),color .18s var(--ease),border-color .18s var(--ease);
}
.round-switch__opt:hover{background:var(--ink-700);color:var(--text);border-left-color:var(--mint)}
.round-switch__opt[aria-pressed="true"]{color:var(--yellow);border-left-color:var(--orange)}

/* 移动导航按钮 */
.nav-toggle{
  display:none;
  align-items:center;
  gap:.5rem;
  padding:.45rem .7rem;
  border:1px solid var(--line);
  font-family:var(--font-mono);
  font-size:.64rem;
  letter-spacing:.16em;
  color:var(--text-2);
}
.nav-toggle__bars{display:block;position:relative;width:18px;height:2px;background:var(--mint)}
.nav-toggle__bars::before,
.nav-toggle__bars::after{
  content:"";
  position:absolute;
  left:0;
  width:18px;
  height:2px;
  background:var(--mint);
  transition:transform .2s var(--ease),top .2s var(--ease),background .2s var(--ease);
}
.nav-toggle__bars::before{top:-6px}
.nav-toggle__bars::after{top:6px}
.site-header[data-open="true"] .nav-toggle__bars{background:transparent}
.site-header[data-open="true"] .nav-toggle__bars::before{top:0;transform:rotate(45deg)}
.site-header[data-open="true"] .nav-toggle__bars::after{top:0;transform:rotate(-45deg)}
.nav-toggle__text{line-height:1}

.nav-scrim{
  display:none;
  position:fixed;
  inset:0;
  z-index:65;
  background:rgba(5,7,14,.74);
  opacity:0;
  visibility:hidden;
  transition:opacity .2s var(--ease),visibility .2s var(--ease);
}

/* 桌面垂直索引轨 */
.site-nav{
  position:fixed;
  left:0;
  top:0;
  bottom:0;
  z-index:70;
  width:72px;
  display:flex;
  flex-direction:column;
  align-items:center;
  gap:.85rem;
  padding:80px .35rem 1.5rem;
  background:var(--ink-800);
  border-right:1px solid var(--line);
}
.site-nav__stem{
  writing-mode:vertical-rl;
  font-family:var(--font-mono);
  font-size:.56rem;
  letter-spacing:.34em;
  color:var(--text-3);
  margin-bottom:.35rem;
}
.site-nav__list{display:flex;flex-direction:column;gap:.15rem;width:100%}
.site-nav__link{
  display:flex;
  flex-direction:column;
  align-items:center;
  gap:.45rem;
  width:100%;
  padding:.55rem .12rem;
  color:var(--text-2);
  border-left:2px solid transparent;
  transition:color .18s var(--ease),background .18s var(--ease),border-color .18s var(--ease);
}
.site-nav__dot{width:5px;height:5px;background:var(--text-3);transition:background .18s var(--ease),transform .18s var(--ease)}
.site-nav__label{writing-mode:vertical-rl;font-size:.72rem;font-weight:500;letter-spacing:.14em;line-height:1.2}
.site-nav__link:hover{color:var(--text);background:rgba(46,230,168,.06)}
.site-nav__link:hover .site-nav__dot{background:var(--mint);transform:scale(1.4)}
.site-nav__link[aria-current="page"]{color:var(--yellow);border-left-color:var(--orange);background:rgba(255,122,26,.08)}
.site-nav__link[aria-current="page"] .site-nav__dot{background:var(--yellow);transform:scale(1.4)}
.site-nav__cta{display:none}

/* ---------- 页脚 ---------- */
.site-footer{position:relative;z-index:1;margin-top:clamp(4rem,9vw,8rem);background:var(--ink-800);border-top:1px solid var(--line)}
.footer-band{
  height:56px;
  background:linear-gradient(90deg, rgba(46,230,168,.10) 0%, rgba(255,122,26,.14) 100%);
  clip-path:polygon(0 0, 100% 0, 100% 38%, 0 100%);
}
.footer-inner{width:100%;max-width:1240px;margin-inline:auto;padding:2.75rem 1.1rem 1.4rem}
.footer-grid{display:grid;grid-template-columns:1.5fr 1fr 1fr 1fr;gap:2rem}
.footer-col{min-width:0}
.footer-col__title{
  font-family:var(--font-mono);
  font-size:.66rem;
  font-weight:500;
  letter-spacing:.2em;
  text-transform:uppercase;
  color:var(--text-3);
  margin-bottom:.9rem;
}
.footer-list{display:grid;gap:.55rem}
.footer-list a{
  position:relative;
  display:inline-block;
  color:var(--text-2);
  font-size:.92rem;
  transition:color .18s var(--ease),padding-left .18s var(--ease);
}
.footer-list a::before{
  content:"";
  position:absolute;
  left:0;
  top:50%;
  width:0;
  height:2px;
  background:var(--mint);
  transform:translateY(-50%);
  transition:width .18s var(--ease);
}
.footer-list a:hover{color:var(--text);padding-left:12px}
.footer-list a:hover::before{width:8px}
.footer-brand{font-family:var(--font-display);font-size:1.35rem;font-weight:900;letter-spacing:-.02em}
.footer-sub{font-family:var(--font-mono);font-size:.64rem;letter-spacing:.3em;color:var(--mint);margin-top:.4rem}
.footer-note{margin-top:1rem;max-width:34ch;color:var(--text-2);font-size:.9rem;line-height:1.8}
.footer-bottom{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:.5rem 1.6rem;
  margin-top:2.5rem;
  padding-top:1.1rem;
  border-top:1px solid var(--line);
  font-family:var(--font-mono);
  font-size:.68rem;
  letter-spacing:.06em;
  color:var(--text-3);
}
.footer-legal{color:var(--text-2)}
.footer-meta{color:var(--text-3)}

/* ---------- 显现与计数 ---------- */
.js [data-reveal]{opacity:0;transform:translateY(14px);transition:opacity .5s var(--ease),transform .5s var(--ease)}
.js [data-reveal="in"]{opacity:1;transform:none}

/* ---------- 平板与手机 ---------- */
@media (max-width:1180px){
  .header-bar__tagline{display:none}
}
@media (max-width:960px){
  .header-bar{
    height:56px;
    padding:0 .9rem;
    background:rgba(5,7,14,.95);
    border-bottom:1px solid var(--line);
  }
  .brand__mark{font-size:.98rem}
  .brand__sub{display:none}
  .header-cta{display:none}
  .nav-toggle{display:inline-flex}

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

  .site-nav{
    top:auto;
    bottom:0;
    left:0;
    right:0;
    width:auto;
    height:auto;
    max-height:78vh;
    padding:1.15rem 1rem calc(1.15rem + env(safe-area-inset-bottom));
    flex-direction:column;
    align-items:stretch;
    gap:.5rem;
    border-right:0;
    border-top:1px solid var(--line);
    overflow-y:auto;
    transform:translateY(102%);
    transition:transform .26s var(--ease);
  }
  .site-header[data-open="true"] .site-nav{transform:translateY(0)}
  .site-nav__stem{writing-mode:horizontal-tb;letter-spacing:.3em;margin:0 0 .6rem}
  .site-nav__list{gap:.1rem}
  .site-nav__link{flex-direction:row;gap:.75rem;padding:.78rem .6rem}
  .site-nav__label{writing-mode:horizontal-tb;font-size:.95rem;letter-spacing:.05em}
  .site-nav__link[aria-current="page"]{border-left-color:var(--orange)}
  .site-nav__cta{display:inline-flex;justify-content:center;margin-top:1rem}

  .site-main{padding-top:56px}
  body.nav-locked{overflow:hidden}

  .grid--2,.grid--3,.grid--split{grid-template-columns:1fr}
  .chapter__head{grid-template-columns:1fr;align-items:start}
  .footer-grid{grid-template-columns:1fr 1fr;gap:1.75rem}
  .footer-note{max-width:100%}
}
@media (max-width:560px){
  .footer-grid{grid-template-columns:1fr;gap:1.6rem}
  .footer-bottom{font-size:.64rem;gap:.4rem 1.1rem}
  .band{height:44px}
}

/* ---------- 桌面：让开左侧索引轨 ---------- */
@media (min-width:961px){
  :root{--rail:72px}
  .shell,.footer-inner{max-width:1360px;padding-left:calc(var(--rail) + 1.5rem);padding-right:1.5rem}
  .site-main{padding-top:64px}
}

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