/* ==========================================================================
   安博赛场 · 共享样式表 /assets/site.css
   高原竞技数据感：夜空蓝基底 · 荧光青行动 · 暖金数据 · 砖红变更
   ========================================================================== */

/* --- 1. Reset ----------------------------------------------------------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body,h1,h2,h3,h4,h5,h6,p,ul,ol,dl,dt,dd,figure,blockquote{margin:0}
ul,ol{padding:0;list-style:none}
img,svg,video{max-width:100%;height:auto}
button,input,select,textarea{font:inherit;color:inherit}
button{background:none;border:0}
a{color:inherit;text-decoration:none}
main{display:block}
#main-content{scroll-margin-top:calc(var(--header-h) + 14px)}

/* --- 2. Tokens ---------------------------------------------------------- */
:root{
  --ink-900:#060B16;
  --ink-800:#0A1428;
  --glass:#1C3350;
  --teal:#3DF5D4;
  --gold:#F5C15C;
  --brick:#C4473A;
  --mist:#E8EDF4;
  --gray:#8FA3BF;
  --volt:#5B8CFF;
  --deep-teal:#0E3B3A;

  --bg:var(--ink-800);
  --bg-deep:var(--ink-900);
  --surface:rgba(28,51,80,.52);
  --surface-deep:rgba(14,59,58,.42);
  --line:rgba(143,163,191,.20);
  --line-soft:rgba(143,163,191,.12);
  --line-strong:rgba(61,245,212,.32);

  --shell-max:1280px;
  --gutter:clamp(16px,4vw,44px);
  --header-h:84px;

  --radius-sm:10px;
  --radius:16px;
  --radius-lg:24px;
  --pill:999px;

  --font-head:"PingFang SC","Hiragino Sans GB","Microsoft YaHei",-apple-system,system-ui,sans-serif;
  --font-body:"Songti SC","Source Han Serif SC","Noto Serif SC","SimSun",Georgia,serif;
  --font-mono:ui-monospace,SFMono-Regular,Menlo,Consolas,"Liberation Mono",monospace;

  --shadow-island:0 14px 40px rgba(3,8,18,.55);
  --shadow-glow:0 10px 30px rgba(61,245,212,.16);
  --ease:cubic-bezier(.22,.61,.36,1);
}

/* --- 3. Base / 中文排版 -------------------------------------------------- */
body{
  min-height:100vh;
  font-family:var(--font-body);
  font-size:clamp(16px,.55vw + 14.4px,17.5px);
  line-height:1.85;
  color:var(--mist);
  background-color:var(--bg);
  background-image:
    repeating-linear-gradient(90deg,rgba(143,163,191,.05) 0 1px,transparent 1px 112px),
    repeating-linear-gradient(0deg,rgba(143,163,191,.04) 0 1px,transparent 1px 112px),
    radial-gradient(1100px 620px at 8% -8%,rgba(61,245,212,.12),transparent 62%),
    radial-gradient(900px 520px at 96% 4%,rgba(91,140,255,.12),transparent 60%),
    radial-gradient(1000px 760px at 76% 104%,rgba(245,193,92,.09),transparent 66%);
  -webkit-font-smoothing:antialiased;
}
h1,h2,h3,h4,h5,h6{font-family:var(--font-head);font-weight:800;letter-spacing:-.015em;line-height:1.2;color:#F2F6FB}
p{text-wrap:pretty}
::selection{background:var(--teal);color:var(--ink-900)}
:focus-visible{outline:2px solid var(--volt);outline-offset:3px;border-radius:6px}

/* --- 4. 跳转链接 --------------------------------------------------------- */
.skip-link{
  position:absolute;top:-72px;left:var(--gutter);z-index:200;
  padding:12px 22px;border-radius:0 0 var(--radius) var(--radius);
  background:var(--teal);color:var(--ink-900);
  font-family:var(--font-head);font-weight:700;font-size:14px;
  transition:top .2s var(--ease);
}
.skip-link:focus,.skip-link:focus-visible{top:0;outline-offset:0}

/* --- 5. 页头浮岛 --------------------------------------------------------- */
.site-header{
  position:sticky;top:0;z-index:70;
  padding:14px 0 0;
}
.site-header::before{
  content:"";position:absolute;inset:0;z-index:0;opacity:0;pointer-events:none;
  background:linear-gradient(180deg,rgba(6,11,22,.94),rgba(6,11,22,.62) 62%,rgba(6,11,22,0));
  transition:opacity .3s var(--ease);
}
.site-header[data-stuck]::before{opacity:1}
.header-shell{
  position:relative;z-index:1;
  display:flex;align-items:center;justify-content:space-between;
  gap:14px;
}
.brand{
  display:inline-flex;align-items:center;gap:12px;
  padding:9px 22px 9px 12px;
  border-radius:var(--pill);
  background:linear-gradient(135deg,rgba(28,51,80,.86),rgba(10,20,40,.78));
  border:1px solid rgba(61,245,212,.22);
  box-shadow:var(--shadow-island);
  -webkit-backdrop-filter:blur(16px) saturate(1.2);
  backdrop-filter:blur(16px) saturate(1.2);
  transition:border-color .25s var(--ease),transform .25s var(--ease);
}
.brand:hover{border-color:var(--line-strong);transform:translateY(-1px)}
.brand-mark{
  position:relative;flex:0 0 auto;
  display:inline-grid;place-items:center;
  width:30px;height:30px;border-radius:9px;
  background:linear-gradient(140deg,var(--deep-teal),rgba(61,245,212,.22));
  border:1px solid rgba(61,245,212,.4);
}
.brand-mark-core{
  width:10px;height:10px;border-radius:3px;
  background:linear-gradient(135deg,var(--teal),var(--gold));
  box-shadow:0 0 12px rgba(61,245,212,.7);
}
.brand-text{display:flex;flex-direction:column;gap:1px;min-width:0}
.brand-name{
  font-family:var(--font-head);font-weight:900;font-size:18.5px;
  letter-spacing:.06em;line-height:1.2;color:#F4F8FD;
}
.brand-line{
  font-family:var(--font-head);font-weight:500;font-size:11.5px;
  letter-spacing:.04em;line-height:1.3;color:var(--gray);
  white-space:nowrap;overflow:hidden;text-overflow:ellipsis;
}

/* 胶囊导航 */
.nav-capsule{
  display:flex;align-items:center;gap:6px;
  padding:6px 6px 6px 10px;
  border-radius:var(--pill);
  background:rgba(28,51,80,.55);
  border:1px solid var(--line);
  box-shadow:var(--shadow-island);
  -webkit-backdrop-filter:blur(18px) saturate(1.2);
  backdrop-filter:blur(18px) saturate(1.2);
}
.nav-list{display:flex;align-items:center;gap:2px}
.nav-link{
  display:block;padding:9px 15px;border-radius:var(--pill);
  font-family:var(--font-head);font-weight:600;font-size:14.5px;
  letter-spacing:.03em;color:var(--gray);white-space:nowrap;
  transition:color .2s var(--ease),background .2s var(--ease);
}
.nav-link:hover{color:var(--mist);background:rgba(61,245,212,.10)}
.nav-link[aria-current="page"]{
  color:#EAFFFB;background:rgba(61,245,212,.16);
  box-shadow:inset 0 0 0 1px rgba(61,245,212,.45);
}
.nav-cta{
  display:inline-flex;align-items:center;gap:9px;
  padding:10px 19px;border-radius:var(--pill);
  background:linear-gradient(120deg,var(--teal),#31D6C0 70%,#2ACFC6);
  color:#04121A;font-family:var(--font-head);font-weight:700;font-size:14px;
  letter-spacing:.04em;white-space:nowrap;
  box-shadow:0 8px 22px rgba(61,245,212,.24);
  transition:transform .2s var(--ease),box-shadow .25s var(--ease);
}
.nav-cta:hover{transform:translateY(-1px);box-shadow:0 14px 30px rgba(61,245,212,.36)}
.nav-cta-dot{width:7px;height:7px;border-radius:50%;background:#04121A;animation:breathe 2.8s ease-in-out infinite}
@keyframes breathe{0%,100%{opacity:.4;transform:scale(.82)}50%{opacity:1;transform:scale(1.18)}}

/* 移动按钮 */
.nav-toggle{
  display:none;align-items:center;gap:10px;
  padding:11px 17px;border-radius:var(--pill);
  background:rgba(28,51,80,.72);
  border:1px solid var(--line-strong);
  color:var(--mist);cursor:pointer;
  font-family:var(--font-head);font-weight:700;font-size:14px;letter-spacing:.06em;
  -webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);
  transition:background .2s var(--ease),border-color .2s var(--ease);
}
.nav-toggle:hover{background:rgba(28,51,80,.95)}
.nav-toggle-bars{display:inline-flex;flex-direction:column;justify-content:center;gap:4px;width:18px}
.nav-toggle-bar{display:block;height:2px;width:18px;border-radius:2px;background:var(--teal);transition:transform .25s var(--ease),opacity .2s var(--ease)}
.nav-toggle-bar:nth-child(2){width:12px}
.site-header[data-open] .nav-toggle-bar:nth-child(1){transform:translateY(6px) rotate(45deg)}
.site-header[data-open] .nav-toggle-bar:nth-child(2){opacity:0;transform:scaleX(.2)}
.site-header[data-open] .nav-toggle-bar:nth-child(3){transform:translateY(-6px) rotate(-45deg)}

/* 阅读进度 */
.reading-progress{
  position:fixed;top:0;left:0;right:0;height:3px;z-index:90;
  pointer-events:none;background:rgba(143,163,191,.10);
}
.reading-progress-bar{
  display:block;width:0;height:100%;
  background:linear-gradient(90deg,var(--teal),var(--volt) 55%,var(--gold));
  box-shadow:0 0 14px rgba(61,245,212,.6);
}

/* --- 6. 页脚分层 --------------------------------------------------------- */
.site-footer{
  position:relative;z-index:1;
  margin-top:clamp(64px,9vw,128px);
  background:linear-gradient(180deg,rgba(6,11,22,.55),var(--bg-deep) 58%);
  border-top:1px solid var(--line);
}
.rule-spectrum{
  height:3px;
  background:linear-gradient(90deg,var(--teal),var(--volt) 32%,var(--gold) 64%,var(--brick) 88%,transparent);
  opacity:.88;
}
.footer-shell{padding-top:clamp(38px,5vw,64px);padding-bottom:clamp(20px,3vw,32px)}
.footer-grid{
  display:grid;
  grid-template-columns:1.5fr .85fr .85fr 1.3fr;
  gap:clamp(22px,3vw,48px);
  align-items:start;
}
.footer-brand-title{
  font-family:var(--font-head);font-weight:800;font-size:19px;
  letter-spacing:-.01em;line-height:1.4;color:#F2F6FB;
}
.footer-brand-note{margin-top:8px;font-size:14.5px;color:var(--gray)}
.footer-tags{display:flex;flex-wrap:wrap;gap:8px;margin-top:18px}
.footer-title{
  font-family:var(--font-head);font-weight:700;font-size:12.5px;
  letter-spacing:.2em;color:#B9C7DC;margin-bottom:14px;
}
.footer-title::before{
  content:"";display:inline-block;width:6px;height:6px;border-radius:50%;
  background:var(--teal);margin-right:9px;vertical-align:2px;
  box-shadow:0 0 10px rgba(61,245,212,.7);
}
.footer-links{display:grid;gap:2px}
.footer-link{
  display:inline-block;padding:5px 0;font-size:15px;color:#C2CEE0;
  transition:color .2s var(--ease),transform .2s var(--ease);
}
.footer-link:hover{color:var(--teal);transform:translateX(3px)}
.contact-list{display:grid;gap:2px}
.contact-row{
  display:grid;grid-template-columns:auto 1fr;gap:14px;
  padding:7px 0;border-bottom:1px dashed var(--line-soft);
}
.contact-row:last-of-type{border-bottom:0}
.contact-label{
  font-family:var(--font-head);font-size:12.5px;letter-spacing:.08em;
  color:var(--gray);white-space:nowrap;padding-top:2px;
}
.contact-value{font-size:14.5px;color:var(--mist);word-break:break-word}
.footer-note{margin-top:14px;font-size:13.5px;line-height:1.75;color:var(--gray)}
.footer-bottom{
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:14px;
  margin-top:clamp(28px,4vw,48px);padding-top:18px;
  border-top:1px solid var(--line);
  font-family:var(--font-head);font-size:13px;color:var(--gray);
}
.footer-copy{letter-spacing:.04em}
.footer-icp{font-family:var(--font-mono);letter-spacing:.02em;color:#9FB0C8}
.footer-top{
  display:inline-flex;align-items:center;gap:8px;
  padding:9px 17px;border-radius:var(--pill);cursor:pointer;
  background:rgba(28,51,80,.5);border:1px solid var(--line);
  color:var(--mist);font-family:var(--font-head);font-size:13px;font-weight:600;letter-spacing:.04em;
  transition:border-color .2s var(--ease),background .2s var(--ease),transform .2s var(--ease);
}
.footer-top::before{content:"↑";color:var(--teal);font-size:14px;line-height:1}
.footer-top:hover{border-color:var(--line-strong);background:rgba(28,51,80,.8);transform:translateY(-2px)}

/* --- 7. 布局基元 --------------------------------------------------------- */
.shell{width:100%;max-width:var(--shell-max);margin:0 auto;padding-left:var(--gutter);padding-right:var(--gutter)}
.section{padding-block:clamp(52px,7vw,104px)}
.section-head{display:grid;gap:14px;margin-bottom:clamp(24px,3vw,42px)}
.split{
  display:grid;
  grid-template-columns:minmax(0,38fr) minmax(0,62fr);
  gap:clamp(24px,3.4vw,60px);
  align-items:start;
}
.split--reverse{grid-template-columns:minmax(0,62fr) minmax(0,38fr)}
.split-axis{min-width:0}
.split-canvas{min-width:0}

/* --- 8. 文字层级 --------------------------------------------------------- */
.eyebrow{
  display:inline-flex;align-items:center;gap:10px;
  font-family:var(--font-head);font-weight:700;font-size:12.5px;
  letter-spacing:.22em;color:var(--teal);text-transform:uppercase;
}
.eyebrow::before{
  content:"";width:28px;height:2px;border-radius:2px;
  background:linear-gradient(90deg,var(--teal),rgba(61,245,212,0));
}
.display-title{
  font-family:var(--font-head);font-weight:900;
  font-size:clamp(38px,6.2vw,74px);line-height:1.03;
  letter-spacing:-.035em;font-stretch:condensed;
}
.section-title{
  font-family:var(--font-head);font-weight:800;
  font-size:clamp(24px,3.1vw,38px);line-height:1.16;letter-spacing:-.02em;
}
.lede{font-size:clamp(16px,1.3vw,19px);line-height:1.85;color:#C6D2E4;max-width:62ch}
.note{font-size:13.5px;line-height:1.75;color:var(--gray)}
.data-num{
  font-family:var(--font-mono);font-weight:700;
  font-size:clamp(30px,4.2vw,58px);line-height:1;
  letter-spacing:-.02em;color:var(--gold);font-variant-numeric:tabular-nums;
}
.data-unit{font-family:var(--font-head);font-size:13px;letter-spacing:.08em;color:var(--gray);margin-left:6px}

/* --- 9. 正文容器 --------------------------------------------------------- */
.prose{max-width:72ch;font-size:clamp(16px,1.05vw,17.5px)}
.prose > * + *{margin-top:1.05em}
.prose h2{font-size:clamp(23px,2.5vw,32px);margin-top:1.8em;letter-spacing:-.02em}
.prose h3{font-size:clamp(19px,1.8vw,23px);margin-top:1.5em}
.prose p{color:#DCE4EF}
.prose a{color:var(--volt);text-decoration:underline;text-underline-offset:3px}
.prose a:hover{color:var(--teal)}
.prose strong{color:#FFFFFF;font-weight:700}
.prose ul{display:grid;gap:.55em}
.prose ul li{position:relative;padding-left:20px}
.prose ul li::before{
  content:"";position:absolute;left:0;top:.8em;
  width:9px;height:2px;border-radius:2px;background:var(--teal);
}
.prose ol{counter-reset:item;display:grid;gap:.55em}
.prose ol li{position:relative;padding-left:30px}
.prose ol li::before{
  counter-increment:item;content:counter(item);
  position:absolute;left:0;top:.1em;
  font-family:var(--font-mono);font-size:13px;color:var(--gold);
}
.prose blockquote{
  padding:6px 0 6px 20px;border-left:2px solid var(--teal);
  color:#C6D2E4;font-style:normal;
}
.prose code{
  font-family:var(--font-mono);font-size:.92em;color:var(--gold);
  background:rgba(28,51,80,.55);padding:2px 7px;border-radius:6px;
}
.prose hr{border:0;height:1px;background:var(--line);margin:2.2em 0}

/* --- 10. 面板 / 标签 / 按钮 ---------------------------------------------- */
.glass-panel{
  padding:clamp(18px,2.4vw,30px);
  border-radius:var(--radius-lg);
  background:var(--surface);
  border:1px solid var(--line);
  -webkit-backdrop-filter:blur(16px) saturate(1.15);
  backdrop-filter:blur(16px) saturate(1.15);
}
.solid-panel{
  padding:clamp(18px,2.4vw,30px);
  border-radius:var(--radius-lg);
  background:linear-gradient(180deg,var(--surface-deep),rgba(6,11,22,.62));
  border:1px solid var(--line);
}
.tag{
  display:inline-flex;align-items:center;gap:6px;
  padding:5px 12px;border-radius:var(--pill);
  font-family:var(--font-head);font-weight:600;font-size:12.5px;letter-spacing:.04em;
  color:var(--gray);background:rgba(28,51,80,.4);border:1px solid var(--line);
  white-space:nowrap;
}
.tag-teal{color:var(--teal);border-color:rgba(61,245,212,.38);background:rgba(61,245,212,.10)}
.tag-gold{color:var(--gold);border-color:rgba(245,193,92,.36);background:rgba(245,193,92,.10)}
.tag-brick{color:#EEA093;border-color:rgba(196,71,58,.52);background:rgba(196,71,58,.16)}
.tag-volt{color:#AAC3FF;border-color:rgba(91,140,255,.42);background:rgba(91,140,255,.12)}
.btn-row{display:flex;flex-wrap:wrap;align-items:center;gap:14px}
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:10px;
  padding:13px 25px;border-radius:var(--pill);cursor:pointer;
  font-family:var(--font-head);font-weight:700;font-size:15px;letter-spacing:.04em;
  border:1px solid transparent;
  transition:transform .2s var(--ease),box-shadow .25s var(--ease),background .25s var(--ease),color .2s var(--ease),border-color .25s var(--ease);
}
.btn-primary{
  background:linear-gradient(120deg,var(--teal),#2FD0C4 58%,var(--volt));
  color:var(--ink-900);box-shadow:0 10px 28px rgba(61,245,212,.24);
}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 16px 38px rgba(61,245,212,.34)}
.btn-ghost{background:rgba(28,51,80,.4);border-color:var(--line);color:var(--mist)}
.btn-ghost:hover{border-color:var(--line-strong);background:rgba(28,51,80,.78);transform:translateY(-2px)}

/* --- 11. 面包屑 / 章节导航 ---------------------------------------------- */
.breadcrumbs{padding-top:clamp(16px,2vw,24px)}
.breadcrumbs-list{
  display:flex;flex-wrap:wrap;align-items:center;gap:8px;
  font-family:var(--font-head);font-size:13px;letter-spacing:.04em;color:var(--gray);
}
.breadcrumbs-list li{display:inline-flex;align-items:center;gap:8px}
.breadcrumbs-list li::after{content:"/";color:rgba(143,163,191,.45)}
.breadcrumbs-list li:last-child::after{content:""}
.breadcrumbs-link{color:var(--gray);transition:color .2s var(--ease)}
.breadcrumbs-link:hover{color:var(--teal)}
.breadcrumbs-current{color:var(--mist)}
.chapter-nav{display:flex;flex-direction:column;gap:4px}
.chapter-link{
  display:block;padding:10px 14px;border-radius:var(--radius-sm);
  border-left:2px solid transparent;
  font-family:var(--font-head);font-weight:600;font-size:14px;letter-spacing:.02em;
  color:var(--gray);
  transition:color .2s var(--ease),background .2s var(--ease),border-color .2s var(--ease);
}
.chapter-link:hover{color:var(--mist);background:rgba(28,51,80,.55)}
.chapter-link[data-active="true"]{
  color:var(--teal);background:rgba(61,245,212,.08);
  border-left-color:var(--teal);
}

/* --- 12. 影像容器 -------------------------------------------------------- */
.media-frame{
  position:relative;overflow:hidden;
  aspect-ratio:16/10;width:100%;
  border-radius:var(--radius-lg);border:1px solid var(--line);
  background:
    radial-gradient(120% 90% at 20% 0%,rgba(61,245,212,.18),transparent 60%),
    linear-gradient(150deg,var(--deep-teal),rgba(6,11,22,.9));
}
.media-frame img{display:block;width:100%;height:100%;object-fit:cover}
.media-frame::after{
  content:"";position:absolute;inset:0;pointer-events:none;
  background:linear-gradient(180deg,rgba(6,11,22,0) 42%,rgba(6,11,22,.74));
}
.media-frame--wide{aspect-ratio:21/9}
.media-frame--tall{aspect-ratio:3/4}
.media-frame--square{aspect-ratio:1/1}
.media-caption{
  margin-top:10px;font-family:var(--font-head);font-size:12.5px;
  letter-spacing:.06em;color:var(--gray);
}

/* --- 13. 入场显现 -------------------------------------------------------- */
.reveal{opacity:0;transform:translateY(14px);transition:opacity .6s var(--ease),transform .6s var(--ease)}
.reveal.is-in{opacity:1;transform:none}

/* --- 14. 响应式 --------------------------------------------------------- */
@media (min-width:1025px){
  .split-axis{position:sticky;top:calc(var(--header-h) + 18px)}
}
@media (max-width:1080px){
  .footer-grid{grid-template-columns:1fr 1fr;gap:clamp(20px,4vw,36px)}
}
@media (max-width:1024px){
  :root{--header-h:74px}
  .nav-toggle{display:inline-flex}
  .nav-capsule{
    position:fixed;
    top:calc(var(--header-h) + 6px);
    left:var(--gutter);right:var(--gutter);
    flex-direction:column;align-items:stretch;gap:10px;
    padding:14px;border-radius:var(--radius-lg);
    background:linear-gradient(160deg,rgba(18,38,62,.97),rgba(6,11,22,.97));
    border:1px solid var(--line-strong);
    box-shadow:var(--shadow-island);
    max-height:calc(100vh - var(--header-h) - 32px);
    overflow-y:auto;
    opacity:0;visibility:hidden;transform:translateY(-10px);
    transition:opacity .26s var(--ease),transform .26s var(--ease),visibility .26s linear;
  }
  .site-header[data-open] .nav-capsule{opacity:1;visibility:visible;transform:none}
  .nav-list{flex-direction:column;align-items:stretch;gap:4px}
  .nav-link{padding:12px 15px;font-size:15px;border-radius:var(--radius-sm)}
  .nav-link[aria-current="page"]{box-shadow:inset 0 0 0 1px rgba(61,245,212,.4)}
  .nav-cta{justify-content:center;margin-top:4px;padding:13px 20px}
}
@media (max-width:960px){
  .split,.split--reverse{grid-template-columns:1fr;gap:clamp(20px,4vw,34px)}
  .split-axis{position:static}
}
@media (max-width:640px){
  .footer-grid{grid-template-columns:1fr}
  .footer-bottom{justify-content:flex-start;gap:10px}
  .brand{padding:8px 16px 8px 10px;gap:10px}
  .brand-name{font-size:16.5px}
  .brand-line{font-size:10.5px;max-width:44vw}
  .contact-row{grid-template-columns:1fr;gap:2px}
  .display-title{font-size:clamp(32px,9vw,46px)}
}

/* --- 15. 降低动效 -------------------------------------------------------- */
@media (prefers-reduced-motion: reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
  }
  .nav-cta-dot{animation:none;opacity:1;transform:none}
  .reveal{opacity:1;transform:none}
  .footer-link:hover,.btn:hover,.footer-top:hover,.brand:hover{transform:none}
}