/* =========================================================
   AK看台 · 共享样式 /assets/site.css
   深靛蓝暗场霓虹 · 模块化 Bento · 悬浮胶囊导航
   ========================================================= */

:root{
  --ink:#0A1230;
  --ink-deep:#070D22;
  --jade:#0B2B2E;
  --wine:#5E1630;
  --violet:#2B1F58;
  --neon:#35E8C8;
  --neon-soft:rgba(53,232,200,.12);
  --signal-yellow:#FFD24A;
  --signal-red:#FF3F5B;
  --paper:#F4F6FB;
  --mist:#9AA6C4;
  --glass:rgba(255,255,255,.08);
  --glass-line:rgba(255,255,255,.13);
  --line:rgba(154,166,196,.18);
  --line-strong:rgba(154,166,196,.32);
  --radius-xl:28px;
  --radius-lg:20px;
  --radius-md:14px;
  --radius-sm:10px;
  --shell:1240px;
  --font-display:"Noto Serif SC","Source Han Serif SC","Songti SC","SimSun",Georgia,"Times New Roman",serif;
  --font-body:"Inter","Noto Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;
  --font-mono:"JetBrains Mono","SFMono-Regular","DejaVu Sans Mono",Consolas,"Liberation Mono",monospace;
  --font-cond:"Oswald","Arial Narrow","Helvetica Neue Condensed",Impact,sans-serif;
  --shadow-card:0 18px 42px rgba(3,6,20,.44);
  --shadow-pop:0 24px 56px rgba(3,6,20,.62);
}

*,*::before,*::after{box-sizing:border-box}

html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}

body{
  margin:0;
  padding-top:88px;
  min-height:100vh;
  background-color:var(--ink);
  background-image:
    radial-gradient(1100px 540px at 10% -10%, rgba(43,31,88,.60), transparent 62%),
    radial-gradient(900px 500px at 92% 2%, rgba(11,43,46,.70), transparent 60%),
    radial-gradient(760px 460px at 48% 106%, rgba(94,22,48,.40), transparent 66%);
  background-attachment:fixed;
  color:var(--paper);
  font-family:var(--font-body);
  font-size:16px;
  line-height:1.75;
  letter-spacing:.008em;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}

h1,h2,h3,h4,h5,h6{
  margin:0;
  font-family:var(--font-display);
  font-weight:700;
  line-height:1.24;
  color:var(--paper);
}

p{margin:0 0 1em}
p:last-child{margin-bottom:0}

ul,ol{margin:0;padding:0}
li{list-style:none}

img,svg,video{max-width:100%;display:block}

a{color:inherit}

button{font:inherit;color:inherit}

strong,b{font-weight:700;color:var(--paper)}

::selection{background:var(--neon);color:#04201C}

:focus-visible{
  outline:2px solid var(--neon);
  outline-offset:3px;
}

/* ---------- 通用工具 ---------- */
.visually-hidden{
  position:absolute!important;
  width:1px;height:1px;
  margin:-1px;padding:0;border:0;
  clip:rect(0 0 0 0);clip-path:inset(50%);
  overflow:hidden;white-space:nowrap;
}

.skip-link{
  position:fixed;
  top:10px;left:12px;
  z-index:200;
  padding:10px 18px;
  border-radius:12px;
  background:var(--neon);
  color:#04201C;
  font-weight:700;font-size:14px;
  text-decoration:none;
  transform:translateY(-180%);
  transition:transform .22s ease;
}
.skip-link:focus{transform:translateY(0)}

.container{
  width:100%;
  max-width:var(--shell);
  margin:0 auto;
  padding-left:clamp(16px,4vw,32px);
  padding-right:clamp(16px,4vw,32px);
}
.container--narrow{max-width:880px}
.container--wide{max-width:1480px}

/* =========================================================
   头部 · 悬浮胶囊导航
   ========================================================= */
.site-header{
  position:fixed;
  top:0;left:0;right:0;
  z-index:100;
  padding:14px clamp(12px,3vw,28px) 0;
  pointer-events:none;
  transition:padding .3s ease;
}

.header-shell{
  position:relative;
  pointer-events:auto;
  max-width:var(--shell);
  margin:0 auto;
  border-radius:999px;
  background:rgba(10,18,48,.74);
  border:1px solid rgba(53,232,200,.22);
  backdrop-filter:blur(18px) saturate(150%);
  -webkit-backdrop-filter:blur(18px) saturate(150%);
  box-shadow:var(--shadow-pop),inset 0 1px 0 rgba(255,255,255,.07);
  transition:background .3s ease,border-color .3s ease,border-radius .3s ease,box-shadow .3s ease;
}

.site-header[data-scrolled] .header-shell{
  border-radius:18px;
  background:rgba(8,14,38,.93);
  border-color:rgba(53,232,200,.34);
  box-shadow:var(--shadow-pop),inset 0 1px 0 rgba(255,255,255,.09);
}

.header-inner{
  display:flex;
  align-items:center;
  gap:12px;
  min-height:62px;
  padding:0 clamp(12px,2vw,20px);
  transition:min-height .3s ease;
}
.site-header[data-scrolled] .header-inner{min-height:54px}

/* 品牌 */
.brand{
  display:flex;
  align-items:center;
  gap:11px;
  min-width:0;
  text-decoration:none;
  color:var(--paper);
  flex:0 0 auto;
}
.brand-mark{
  display:grid;
  place-items:center;
  flex:0 0 auto;
  width:40px;height:40px;
  border-radius:13px;
  background:linear-gradient(150deg,rgba(53,232,200,.24),rgba(43,31,88,.82));
  border:1px solid rgba(53,232,200,.52);
  color:var(--neon);
  font-family:var(--font-cond);
  font-size:16px;
  font-weight:700;
  letter-spacing:.08em;
  line-height:1;
  box-shadow:0 6px 18px rgba(53,232,200,.16),inset 0 0 0 1px rgba(10,18,48,.55);
}
.brand--footer .brand-mark{width:46px;height:46px;border-radius:15px;font-size:18px}
.brand-text{display:flex;flex-direction:column;min-width:0}
.brand-name{
  font-family:var(--font-display);
  font-size:17px;
  font-weight:700;
  letter-spacing:.03em;
  line-height:1.2;
  white-space:nowrap;
}
.brand-tagline{
  font-size:11px;
  letter-spacing:.18em;
  color:var(--mist);
  line-height:1.5;
  white-space:nowrap;
}

/* 导航 */
.site-nav{
  position:absolute;
  top:calc(100% + 12px);
  left:0;right:0;
  display:none;
  padding:14px;
  border-radius:22px;
  background:rgba(8,14,38,.97);
  border:1px solid rgba(53,232,200,.24);
  backdrop-filter:blur(20px) saturate(150%);
  -webkit-backdrop-filter:blur(20px) saturate(150%);
  box-shadow:var(--shadow-pop);
}
.site-nav[data-open]{display:block}

.nav-list{display:grid;gap:4px}

.nav-link{
  display:flex;
  align-items:center;
  min-height:48px;
  padding:0 16px;
  border-radius:14px;
  border:1px solid transparent;
  color:var(--mist);
  font-size:15px;
  text-decoration:none;
  transition:color .2s ease,background .2s ease,border-color .2s ease;
}
.nav-link:hover{color:var(--paper);background:rgba(255,255,255,.07)}
.nav-link[aria-current="page"]{
  color:var(--neon);
  background:var(--neon-soft);
  border-color:rgba(53,232,200,.44);
}

/* 操作区 */
.header-actions{
  display:flex;
  align-items:center;
  gap:10px;
  margin-left:auto;
  flex:0 0 auto;
}
.header-cta{display:none}

.nav-toggle{
  display:inline-flex;
  flex-direction:column;
  justify-content:center;
  gap:5px;
  width:44px;height:44px;
  padding:0 11px;
  border-radius:14px;
  background:rgba(255,255,255,.06);
  border:1px solid var(--line-strong);
  cursor:pointer;
  transition:border-color .2s ease,background .2s ease;
}
.nav-toggle:hover{border-color:rgba(53,232,200,.5);background:var(--neon-soft)}
.nav-toggle-bar{
  display:block;
  width:100%;
  height:2px;
  border-radius:2px;
  background:var(--paper);
  transition:transform .26s ease,opacity .26s ease;
}
.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(1){transform:translateY(7px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(2){opacity:0}
.nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(3){transform:translateY(-7px) rotate(-45deg)}

/* 阅读进度 */
.header-progress{
  position:absolute;
  left:22px;right:22px;bottom:5px;
  height:2px;
  border-radius:2px;
  background:rgba(154,166,196,.16);
  overflow:hidden;
  opacity:0;
  transition:opacity .3s ease;
}
.site-header[data-scrolled] .header-progress{opacity:1}
.progress-bar{
  display:block;
  height:100%;
  width:100%;
  transform:scaleX(0);
  transform-origin:left center;
  background:linear-gradient(90deg,var(--neon),var(--signal-yellow));
}

/* =========================================================
   按钮 · 标签 · 图例
   ========================================================= */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  min-height:46px;
  padding:0 22px;
  border:1px solid transparent;
  border-radius:999px;
  font-family:var(--font-body);
  font-size:14.5px;
  font-weight:600;
  letter-spacing:.02em;
  text-decoration:none;
  cursor:pointer;
  transition:background .2s ease,color .2s ease,border-color .2s ease,box-shadow .2s ease,transform .2s ease;
}
.btn--primary{
  background:var(--neon);
  color:#04201C;
  box-shadow:0 10px 26px rgba(53,232,200,.26);
}
.btn--primary:hover{background:#5BF3DA;box-shadow:0 12px 32px rgba(53,232,200,.38);transform:translateY(-1px)}
.btn--ghost{
  background:rgba(255,255,255,.05);
  color:var(--paper);
  border-color:var(--line-strong);
}
.btn--ghost:hover{border-color:var(--neon);color:var(--neon);background:var(--neon-soft)}
.btn--sm{min-height:40px;padding:0 18px;font-size:13.5px}

.chip{
  display:inline-flex;
  align-items:center;
  gap:6px;
  min-height:26px;
  padding:0 11px;
  border-radius:999px;
  border:1px solid var(--line-strong);
  background:rgba(255,255,255,.05);
  color:var(--mist);
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.04em;
  white-space:nowrap;
}
.chip--neon{color:var(--neon);border-color:rgba(53,232,200,.48);background:var(--neon-soft)}
.chip--yellow{color:var(--signal-yellow);border-color:rgba(255,210,74,.48);background:rgba(255,210,74,.11)}
.chip--red{color:var(--signal-red);border-color:rgba(255,63,91,.48);background:rgba(255,63,91,.12)}

.legend{
  display:flex;
  flex-wrap:wrap;
  gap:10px 20px;
  font-size:13px;
  color:var(--mist);
}
.legend__item{display:inline-flex;align-items:center;gap:8px}
.legend__swatch{
  width:12px;height:12px;
  border-radius:4px;
  background:var(--neon);
  flex:0 0 auto;
}
.legend__swatch--neon{background:var(--neon)}
.legend__swatch--jade{background:var(--jade);border:1px solid rgba(53,232,200,.55)}
.legend__swatch--violet{background:var(--violet);border:1px solid rgba(154,166,196,.5)}
.legend__swatch--wine{background:var(--wine);border:1px solid rgba(255,63,91,.5)}
.legend__swatch--yellow{background:var(--signal-yellow)}
.legend__swatch--red{background:var(--signal-red)}

/* =========================================================
   排版层级
   ========================================================= */
.eyebrow{
  display:inline-block;
  margin:0 0 12px;
  font-family:var(--font-mono);
  font-size:11.5px;
  letter-spacing:.24em;
  text-transform:uppercase;
  color:var(--neon);
}
.display-xl{
  font-family:var(--font-display);
  font-weight:700;
  font-size:clamp(30px,5.4vw,58px);
  line-height:1.08;
  letter-spacing:-.012em;
}
.display-l{
  font-size:clamp(23px,3.4vw,36px);
  line-height:1.18;
}
.lede{
  max-width:64ch;
  margin:0;
  font-size:clamp(15px,1.7vw,18px);
  line-height:1.78;
  color:var(--mist);
}
.prose{
  max-width:68ch;
  font-size:16px;
  line-height:1.78;
  color:rgba(244,246,251,.87);
}
.prose h2,.prose h3{margin:1.9em 0 .55em;line-height:1.26}
.prose h2{font-size:clamp(21px,2.6vw,28px)}
.prose h3{font-size:clamp(17px,2vw,21px)}
.prose p{margin:0 0 1.05em}
.prose a{color:var(--neon);text-decoration:underline;text-underline-offset:3px}
.prose ul,.prose ol{margin:0 0 1.1em;padding-left:1.15em}
.prose li{list-style:disc;margin:0 0 .4em;color:rgba(244,246,251,.87)}
.prose ol li{list-style:decimal}

/* =========================================================
   章节编号体系
   ========================================================= */
.chapter{position:relative;padding:clamp(30px,5vw,60px) 0}
.chapter__index{
  display:block;
  margin:0 0 .1em;
  font-family:var(--font-cond);
  font-size:clamp(52px,9vw,116px);
  font-weight:700;
  line-height:.84;
  letter-spacing:-.02em;
  color:rgba(53,232,200,.10);
  -webkit-text-stroke:1px rgba(53,232,200,.55);
}
.chapter__title{
  font-family:var(--font-display);
  font-size:clamp(21px,3vw,32px);
  margin:0 0 .5em;
}
.chapter-link{
  display:flex;
  align-items:center;
  gap:10px;
  padding:9px 13px;
  border-radius:var(--radius-md);
  border:1px solid transparent;
  color:var(--mist);
  font-size:14px;
  text-decoration:none;
  transition:color .25s ease,background .25s ease,border-color .25s ease;
}
.chapter-link:hover{color:var(--paper);background:rgba(255,255,255,.05)}
.chapter-link[data-active]{
  color:var(--neon);
  background:var(--neon-soft);
  border-color:rgba(53,232,200,.42);
}

/* =========================================================
   布局组件
   ========================================================= */
.section{padding:clamp(38px,6vw,80px) 0}

.bento{
  display:grid;
  grid-template-columns:1fr;
  gap:clamp(12px,1.6vw,20px);
}
.bento__cell{min-width:0}

.section-rule{
  display:block;
  width:100%;
  height:clamp(40px,6vw,72px);
  border-radius:var(--radius-lg);
  border:1px solid var(--line);
  background:
    repeating-linear-gradient(90deg,rgba(255,255,255,.06) 0 1px,transparent 1px 46px),
    linear-gradient(90deg,rgba(43,31,88,.95),rgba(11,43,46,.92) 38%,rgba(94,22,48,.86) 70%,rgba(10,18,48,.92));
}

.panel{
  position:relative;
  padding:clamp(18px,2.4vw,28px);
  border-radius:var(--radius-xl);
  border:1px solid var(--glass-line);
  background:linear-gradient(160deg,rgba(255,255,255,.10),rgba(255,255,255,.03));
  backdrop-filter:blur(14px) saturate(135%);
  -webkit-backdrop-filter:blur(14px) saturate(135%);
  box-shadow:var(--shadow-card),inset 0 1px 0 rgba(255,255,255,.08);
}
.panel--solid{
  background:var(--ink-deep);
  backdrop-filter:none;
  -webkit-backdrop-filter:none;
}
.panel--jade{
  background:linear-gradient(165deg,rgba(11,43,46,.96),rgba(11,43,46,.66));
  border-color:rgba(53,232,200,.30);
}
.panel--wine{
  background:linear-gradient(165deg,rgba(94,22,48,.92),rgba(94,22,48,.58));
  border-color:rgba(255,63,91,.32);
}
.panel--violet{
  background:linear-gradient(165deg,rgba(43,31,88,.96),rgba(43,31,88,.62));
  border-color:rgba(154,166,196,.30);
}
.panel__label{
  display:block;
  margin:0 0 10px;
  font-family:var(--font-mono);
  font-size:11.5px;
  letter-spacing:.2em;
  text-transform:uppercase;
  color:var(--mist);
}

/* 数值 */
.stat{
  display:inline-block;
  font-family:var(--font-mono);
  font-variant-numeric:tabular-nums;
  font-size:clamp(22px,3.4vw,34px);
  font-weight:700;
  line-height:1.1;
  color:var(--neon);
  letter-spacing:-.01em;
}
.stat__unit{font-size:.5em;color:var(--mist);margin-left:5px;letter-spacing:.02em}

.data-list{margin:0;display:grid;gap:0}
.data-list__row{
  display:flex;
  align-items:baseline;
  justify-content:space-between;
  gap:14px;
  padding:9px 0;
  border-bottom:1px solid var(--line);
  font-size:14.5px;
}
.data-list__row:last-child{border-bottom:0}
.data-list__row dt{color:var(--mist);margin:0}
.data-list__row dd{
  margin:0;
  font-family:var(--font-mono);
  font-variant-numeric:tabular-nums;
  color:var(--paper);
  text-align:right;
}

/* 面包屑 */
.breadcrumbs{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:8px;
  margin:0 0 20px;
  font-size:13px;
  color:var(--mist);
}
.breadcrumbs li{display:inline-flex;align-items:center;gap:8px}
.breadcrumbs li::after{content:"/";color:rgba(154,166,196,.42)}
.breadcrumbs li:last-child::after{display:none}
.breadcrumbs a{color:var(--mist);text-decoration:none;transition:color .2s ease}
.breadcrumbs a:hover{color:var(--neon)}
.breadcrumbs [aria-current="page"]{color:var(--paper)}

/* =========================================================
   媒体容器（供页面阶段放置图片）
   ========================================================= */
.media{
  position:relative;
  overflow:hidden;
  aspect-ratio:16/9;
  border-radius:var(--radius-lg);
  border:1px solid rgba(255,255,255,.12);
  background:linear-gradient(140deg,rgba(43,31,88,.78),rgba(11,43,46,.74));
}
.media img{
  width:100%;
  height:100%;
  object-fit:cover;
  display:block;
}
.media::after{
  content:"";
  position:absolute;
  inset:0;
  pointer-events:none;
  background:
    linear-gradient(115deg,rgba(53,232,200,.16),transparent 44%),
    linear-gradient(300deg,rgba(94,22,48,.34),transparent 58%);
}
.media--wide{aspect-ratio:21/9}
.media--tall{aspect-ratio:3/4}
.media--square{aspect-ratio:1/1}
.media--panel{border-radius:var(--radius-xl);border-color:var(--glass-line)}
.media__caption{
  margin-top:10px;
  font-size:12.5px;
  line-height:1.6;
  color:var(--mist);
}

/* =========================================================
   页脚
   ========================================================= */
.site-footer{
  position:relative;
  margin-top:clamp(48px,8vw,110px);
  background-image:
    radial-gradient(720px 380px at 12% 0%,rgba(43,31,88,.55),transparent 70%),
    radial-gradient(620px 340px at 86% 8%,rgba(11,43,46,.58),transparent 70%),
    linear-gradient(180deg,rgba(7,13,34,.55),rgba(7,13,34,1) 34%);
  color:var(--paper);
}

.final-whistle{
  height:2px;
  width:100%;
  background:linear-gradient(90deg,
    transparent 0%,
    rgba(53,232,200,.20) 10%,
    var(--neon) 46%,
    var(--signal-yellow) 62%,
    rgba(255,63,91,.9) 82%,
    transparent 100%);
  opacity:.8;
}

.footer-inner{
  padding-top:clamp(36px,6vw,66px);
  padding-bottom:clamp(26px,4vw,44px);
}

.footer-grid{
  display:grid;
  grid-template-columns:1fr;
  gap:clamp(26px,4vw,44px);
}

.footer-brand{display:flex;flex-direction:column;gap:12px;align-items:flex-start}
.footer-note{
  margin:0;
  max-width:38ch;
  font-size:14px;
  line-height:1.7;
  color:var(--mist);
}
.footer-note--dim{font-size:13px;color:rgba(154,166,196,.78)}
.footer-legend{margin-top:4px}

.footer-col{display:flex;flex-direction:column;gap:12px}
.footer-col__title{
  margin:0;
  font-family:var(--font-mono);
  font-size:11.5px;
  font-weight:400;
  letter-spacing:.22em;
  text-transform:uppercase;
  color:var(--neon);
}
.footer-links{display:grid;gap:9px}
.footer-links a{
  display:inline-block;
  font-size:14.5px;
  color:var(--mist);
  text-decoration:none;
  transition:color .2s ease,transform .2s ease;
}
.footer-links a:hover{color:var(--paper);transform:translateX(3px)}

.footer-contact{
  margin-top:clamp(28px,4vw,44px);
  padding-top:clamp(20px,3vw,28px);
  border-top:1px dashed var(--line);
  display:grid;
  gap:6px;
}
.footer-contact__line{
  margin:0;
  font-size:13.5px;
  line-height:1.7;
  color:var(--mist);
}

.footer-base{
  border-top:1px solid rgba(154,166,196,.14);
  background:rgba(4,8,22,.6);
}
.footer-base__inner{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:8px 20px;
  padding-top:16px;
  padding-bottom:16px;
}
.footer-icp,
.footer-copy{
  margin:0;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.04em;
  color:rgba(154,166,196,.78);
}

/* =========================================================
   动效协议
   ========================================================= */
.js-reveal [data-reveal]{
  opacity:0;
  transform:translateY(8px);
  transition:opacity .55s cubic-bezier(.22,.61,.36,1),transform .55s cubic-bezier(.22,.61,.36,1);
}
.js-reveal [data-reveal][data-revealed]{
  opacity:1;
  transform:none;
}

/* =========================================================
   响应式
   ========================================================= */
@media (min-width:560px){
  .header-cta{display:inline-flex}
  .footer-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
  .footer-brand{grid-column:1 / -1}
}

@media (min-width:760px){
  .bento{grid-template-columns:repeat(6,minmax(0,1fr))}
  .bento__cell--focus{grid-column:span 6}
  .bento__cell--half{grid-column:span 3}
  .bento__cell--third{grid-column:span 2}
  .footer-grid{grid-template-columns:1.7fr 1fr 1fr 1fr}
  .footer-brand{grid-column:auto}
}

@media (min-width:1000px){
  body{padding-top:100px}
  .site-header{padding-top:16px}
  .header-inner{min-height:66px}
  .site-header[data-scrolled] .header-inner{min-height:56px}

  .site-nav{
    position:static;
    display:flex;
    flex:1 1 auto;
    justify-content:center;
    padding:0;
    border:0;
    border-radius:0;
    background:none;
    box-shadow:none;
    backdrop-filter:none;
    -webkit-backdrop-filter:none;
  }
  .nav-list{display:flex;align-items:center;justify-content:center;gap:2px}
  .nav-link{
    min-height:40px;
    padding:0 14px;
    border-radius:999px;
    font-size:14px;
    white-space:nowrap;
  }
  .nav-toggle{display:none}
  .header-cta{display:inline-flex}

  .bento{grid-template-columns:repeat(12,minmax(0,1fr))}
  .bento__cell--focus{grid-column:span 6}
  .bento__cell--half{grid-column:span 3}
  .bento__cell--third{grid-column:span 4}
  .bento__cell--tall{grid-row:span 2}
}

@media (min-width:1000px) and (max-width:1140px){
  .nav-link{padding:0 10px;font-size:13.5px}
  .brand-tagline{display:none}
}

/* =========================================================
   无障碍 · 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;
    scroll-behavior:auto!important;
  }
  .js-reveal [data-reveal]{opacity:1;transform:none}
  .progress-bar{transition:none}
}