*,*::before,*::after{box-sizing:border-box}
:root{
  --ink:#050B18;
  --panel:#0B1730;
  --panel-2:#14243F;
  --line:#24395C;
  --dim:#5C7CA8;
  --cyan:#35E6E0;
  --cyan-soft:#9BF6F3;
  --orange:#FF8A3D;
  --orange-soft:#FFC79A;
  --text:#EAF2FB;
  --muted:#93A9C6;
  --font-display:"Helvetica Neue",Arial,"PingFang SC","Noto Sans SC","Microsoft YaHei",sans-serif;
  --font-body:"PingFang SC","Noto Sans SC","Microsoft YaHei",system-ui,-apple-system,sans-serif;
  --font-mono:ui-monospace,SFMono-Regular,Menlo,Consolas,"Liberation Mono",monospace;
  --shell:1200px;
  --gap:24px;
  --radius:2px;
  --ease:cubic-bezier(.4,0,.2,1);
  --shadow:inset 0 1px 0 rgba(255,255,255,.03),0 10px 28px rgba(0,0,0,.35);
}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  margin:0;
  font-family:var(--font-body);
  font-size:16px;
  font-weight:400;
  line-height:1.75;
  letter-spacing:.01em;
  color:var(--text);
  background-color:var(--ink);
  background-image:
    radial-gradient(58% 38% at 88% -6%,rgba(53,230,224,.10),transparent 70%),
    radial-gradient(52% 34% at 4% 0%,rgba(255,138,61,.07),transparent 70%);
  background-repeat:no-repeat;
  background-attachment:fixed;
  -webkit-font-smoothing:antialiased;
}
h1,h2,h3,h4,h5{margin:0;font-family:var(--font-display);font-weight:800;line-height:1.14;letter-spacing:-.01em}
p{margin:0 0 1em}
p:last-child{margin-bottom:0}
ul,ol{margin:0;padding:0;list-style:none}
img{display:block;max-width:100%;height:auto}
button{font:inherit;color:inherit}
a{color:var(--cyan-soft);text-decoration:none;transition:color .15s var(--ease)}
a:hover{color:var(--cyan)}
[hidden]{display:none!important}
::selection{background:rgba(53,230,224,.28);color:#fff}
:focus-visible{outline:2px solid var(--cyan);outline-offset:2px;border-radius:2px}
:focus:not(:focus-visible){outline:none}
.mono{font-family:var(--font-mono);font-variant-numeric:tabular-nums;letter-spacing:.02em}
#main-content{display:block;scroll-margin-top:132px}
[data-today-marker]{scroll-margin-top:132px}

/* 容器 */
.shell{width:100%;max-width:var(--shell);margin:0 auto;padding:0 24px}

/* 跳转链接 */
.skip-link{
  position:absolute;left:16px;top:-72px;z-index:120;
  padding:10px 18px;border-radius:var(--radius);
  background:var(--cyan);color:#04141A;font-weight:700;font-size:14px;
  transition:top .16s var(--ease);
}
.skip-link:focus{top:10px;color:#04141A}

/* ===== 页头 ===== */
.site-header{
  position:sticky;top:0;z-index:60;
  background:rgba(5,11,24,.94);
  -webkit-backdrop-filter:blur(8px);
  backdrop-filter:blur(8px);
  border-bottom:1px solid var(--line);
}
.header-shell{max-width:var(--shell);margin:0 auto;padding:0 24px}
.header-main{display:flex;align-items:center;justify-content:space-between;gap:24px;min-height:76px}
.brand{display:inline-flex;align-items:center;gap:12px;flex:none;color:var(--text)}
.brand:hover{color:var(--text)}
.brand-mark{
  position:relative;width:18px;height:18px;flex:none;
  border:1.5px solid var(--cyan);transform:rotate(45deg);
  transition:border-color .16s var(--ease);
}
.brand-mark::after{
  content:"";position:absolute;inset:4px;background:var(--orange);opacity:.92;
  transition:background .16s var(--ease);
}
.brand:hover .brand-mark{border-color:var(--orange)}
.brand:hover .brand-mark::after{background:var(--cyan)}
.brand-text{display:block;line-height:1.1}
.brand-name{display:block;font-family:var(--font-display);font-size:17px;font-weight:800;letter-spacing:.06em}
.brand-sub{display:block;margin-top:3px;font-family:var(--font-mono);font-size:10px;letter-spacing:.26em;color:var(--dim)}

.site-nav{display:flex;align-items:center;gap:20px;margin-left:auto}
.nav-list{display:flex;align-items:center;gap:2px}
.nav-link{
  position:relative;display:inline-flex;align-items:baseline;gap:6px;
  padding:10px 9px;font-size:14px;color:var(--muted);
  transition:color .15s var(--ease);
}
.nav-link::after{
  content:"";position:absolute;left:9px;right:9px;bottom:4px;height:2px;
  background:var(--cyan);transform:scaleX(0);transform-origin:left center;
  transition:transform .18s var(--ease),background .18s var(--ease);
}
.nav-link:hover,.nav-link:focus-visible{color:var(--text)}
.nav-link:hover::after{transform:scaleX(1);background:var(--dim)}
.nav-link[aria-current="page"]{color:var(--cyan)}
.nav-link[aria-current="page"]::after{transform:scaleX(1);background:var(--cyan)}
.nav-num{font-family:var(--font-mono);font-size:10px;letter-spacing:.04em;color:var(--dim)}
.nav-link[aria-current="page"] .nav-num{color:var(--orange)}
.nav-cta{margin-left:12px;padding:9px 16px;font-size:13px}

.nav-toggle{
  display:none;align-items:center;gap:9px;
  padding:8px 12px;border:1px solid var(--line);border-radius:var(--radius);
  background:var(--panel-2);color:var(--text);cursor:pointer;
  transition:border-color .16s var(--ease),background .16s var(--ease);
}
.nav-toggle:hover{border-color:var(--cyan)}
.nav-toggle-bars{position:relative;display:block;width:16px;height:10px}
.nav-toggle-bars::before,.nav-toggle-bars::after{
  content:"";position:absolute;left:0;right:0;height:2px;background:var(--cyan);
  transition:transform .18s var(--ease),top .18s var(--ease);
}
.nav-toggle-bars::before{top:0}
.nav-toggle-bars::after{top:8px}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars::before{top:4px;transform:rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars::after{top:4px;transform:rotate(-45deg)}
.nav-toggle-label{font-family:var(--font-mono);font-size:11px;letter-spacing:.16em;color:var(--muted)}

.header-utility{
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:10px 16px;
  padding:9px 0 11px;border-top:1px solid rgba(36,57,92,.55);
}
.league-switch{display:flex;flex-wrap:wrap;align-items:center;gap:8px}
.utility-label{font-family:var(--font-mono);font-size:10px;letter-spacing:.22em;text-transform:uppercase;color:var(--dim)}
.chip{
  position:relative;display:inline-flex;align-items:center;
  padding:5px 11px;border:1px solid var(--line);border-radius:var(--radius);
  background:transparent;color:var(--muted);font-size:12px;line-height:1.5;cursor:pointer;
  transition:color .16s var(--ease),border-color .16s var(--ease),background .16s var(--ease),box-shadow .16s var(--ease);
}
.chip:hover{color:var(--text);border-color:var(--dim);background:rgba(20,36,63,.6)}
.chip[aria-pressed="true"]{
  padding-left:14px;color:#04141A;font-weight:600;
  background:var(--cyan);border-color:var(--cyan);
  box-shadow:0 0 18px rgba(53,230,224,.22);
}
.chip[aria-pressed="true"]::before{content:"";position:absolute;left:0;top:0;bottom:0;width:3px;background:var(--orange)}
.date-readout{display:flex;align-items:center;gap:10px;margin-left:auto}
.date-readout .mono{font-size:12px;color:var(--muted)}
.today-jump{
  padding:2px 0;border:0;border-bottom:1px dashed rgba(255,138,61,.55);
  background:none;color:var(--orange);font-size:12px;cursor:pointer;
  transition:color .16s var(--ease),border-color .16s var(--ease);
}
.today-jump:hover{color:var(--orange-soft);border-bottom-color:var(--orange-soft)}

/* ===== 按钮 ===== */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:11px 20px;border:1px solid var(--line);border-radius:var(--radius);
  background:var(--panel-2);color:var(--text);font-size:14px;font-weight:600;line-height:1.2;
  cursor:pointer;text-decoration:none;
  transition:background .16s var(--ease),color .16s var(--ease),border-color .16s var(--ease),transform .16s var(--ease);
}
.btn:hover{color:var(--text);border-color:var(--cyan);transform:translateY(-1px)}
.btn-primary{
  background:var(--cyan);border-color:var(--cyan);color:#04141A;font-weight:700;
  box-shadow:0 8px 22px rgba(53,230,224,.18);
}
.btn-primary:hover{background:var(--cyan-soft);border-color:var(--cyan-soft);color:#04141A}
.btn-ghost{background:transparent}
.btn-ghost:hover{background:rgba(20,36,63,.7);color:var(--cyan)}
.btn-block{display:flex;width:100%}

/* ===== 页脚 ===== */
.site-footer{position:relative;margin-top:72px;background:var(--panel);border-top:1px solid var(--line)}
.site-footer::before{
  content:"";position:absolute;left:0;right:0;top:0;height:2px;
  background:linear-gradient(90deg,transparent,rgba(53,230,224,.75) 20%,rgba(255,138,61,.65) 64%,transparent);
}
.footer-shell{
  display:grid;grid-template-columns:minmax(240px,1fr) minmax(0,2fr);
  gap:40px 56px;max-width:var(--shell);margin:0 auto;padding:56px 24px 28px;
}
.footer-brand{max-width:330px}
.footer-tagline{margin-top:18px;font-size:14px;line-height:1.7;color:var(--muted)}
.footer-note{margin-top:12px;font-size:12px;line-height:1.7;color:var(--dim)}
.footer-cols{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:24px}
.footer-col-title{
  margin:0 0 14px;font-family:var(--font-mono);font-size:11px;font-weight:600;
  letter-spacing:.2em;text-transform:uppercase;color:var(--cyan);
}
.footer-links li+li{margin-top:8px}
.footer-links a{
  display:inline-block;padding:2px 0;font-size:14px;color:var(--muted);
  border-bottom:1px solid transparent;transition:color .15s var(--ease),border-color .15s var(--ease);
}
.footer-links a:hover{color:var(--text);border-bottom-color:var(--orange)}
.footer-contact{
  grid-column:1/-1;display:flex;flex-wrap:wrap;align-items:center;gap:10px 28px;
  padding-top:24px;border-top:1px solid var(--line);
}
.contact-item{display:inline-flex;align-items:center;gap:8px;font-size:13px;color:var(--muted)}
.contact-label{font-family:var(--font-mono);font-size:10px;letter-spacing:.18em;text-transform:uppercase;color:var(--dim)}
.contact-value{font-size:13px;color:var(--text)}
.copy-btn{
  padding:2px 8px;border:1px solid var(--line);border-radius:var(--radius);
  background:transparent;color:var(--dim);font-family:var(--font-mono);font-size:10px;letter-spacing:.1em;
  cursor:pointer;transition:color .16s var(--ease),border-color .16s var(--ease);
}
.copy-btn:hover{color:var(--cyan);border-color:var(--cyan)}
.copy-btn.is-copied{color:var(--orange);border-color:rgba(255,138,61,.6)}
.footer-legal{
  grid-column:1/-1;display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:12px;
  padding-top:18px;border-top:1px solid rgba(36,57,92,.6);
  font-family:var(--font-mono);font-size:11px;letter-spacing:.04em;color:var(--dim);
}
.legal-text{margin:0}
.legal-links{display:flex;flex-wrap:wrap;gap:16px}
.legal-links a{color:var(--dim)}
.legal-links a:hover{color:var(--cyan)}

/* ===== 面包屑 ===== */
.breadcrumb{padding:24px 0 0}
.breadcrumb-list{display:flex;flex-wrap:wrap;align-items:center;gap:8px;font-family:var(--font-mono);font-size:12px;color:var(--dim)}
.breadcrumb-list li{display:inline-flex;align-items:center;gap:8px;margin:0}
.breadcrumb-list li+li::before{content:"/";color:var(--line)}
.breadcrumb-list a{color:var(--muted)}
.breadcrumb-list a:hover{color:var(--cyan)}

/* ===== 排版组件 ===== */
.display{font-family:var(--font-display);font-size:clamp(44px,7.2vw,120px);font-weight:800;line-height:.94;letter-spacing:-.02em}
.kicker{
  display:inline-block;margin-bottom:12px;font-family:var(--font-mono);font-size:11px;
  letter-spacing:.22em;text-transform:uppercase;color:var(--orange);
}
.lede{max-width:62ch;font-size:clamp(15px,1.5vw,18px);line-height:1.75;color:var(--muted)}
.chapter-num{
  display:inline-block;font-family:var(--font-mono);font-size:clamp(28px,4.4vw,56px);
  font-weight:700;line-height:1;letter-spacing:-.02em;color:var(--orange);
}
.section-head{display:flex;flex-wrap:wrap;align-items:baseline;justify-content:space-between;gap:12px 20px;margin-bottom:20px}

/* ===== 面板与堆叠 ===== */
.stack{display:block}
.stack>*+*{margin-top:var(--gap)}
.panel{
  padding:clamp(20px,3vw,32px);border:1px solid var(--line);border-radius:var(--radius);
  background:var(--panel);box-shadow:var(--shadow);
  transition:transform .18s var(--ease),border-color .18s var(--ease),box-shadow .18s var(--ease);
}
.panel--interactive{display:block;color:inherit;text-decoration:none}
.panel--interactive:hover,.panel--interactive:focus-visible{
  transform:translateY(-2px);border-color:#3B5A87;color:inherit;
  box-shadow:inset 0 1px 0 rgba(255,255,255,.05),0 18px 40px rgba(0,0,0,.45);
}
.panel-head{display:flex;align-items:flex-start;justify-content:space-between;gap:16px;margin-bottom:14px}
.panel-index{font-family:var(--font-mono);font-size:12px;letter-spacing:.12em;color:var(--orange)}
.panel-title{font-size:clamp(18px,2vw,22px);font-weight:800;line-height:1.3}
.panel-body{font-size:15px;line-height:1.75;color:var(--muted)}

/* ===== 网格 ===== */
.grid{display:grid;gap:var(--gap)}
.grid--2{grid-template-columns:repeat(2,minmax(0,1fr))}
.grid--3{grid-template-columns:repeat(3,minmax(0,1fr))}
.split{display:grid;grid-template-columns:minmax(0,62fr) minmax(0,38fr);gap:var(--gap);align-items:start}
.split--flip{grid-template-columns:minmax(0,38fr) minmax(0,62fr)}

/* ===== 图片容器基座 ===== */
.media-frame{
  position:relative;overflow:hidden;width:100%;aspect-ratio:16/10;
  border:1px solid var(--line);border-radius:var(--radius);
  background-color:var(--panel-2);
  background-image:
    linear-gradient(148deg,rgba(53,230,224,.16),transparent 52%),
    radial-gradient(80% 70% at 88% 108%,rgba(255,138,61,.22),transparent 66%),
    repeating-linear-gradient(90deg,transparent 0 38px,rgba(36,57,92,.55) 38px 39px);
}
.media-frame img{width:100%;height:100%;object-fit:cover}
.media-frame-fill{position:absolute;inset:0}
.media-frame--wide{aspect-ratio:16/7}
.media-frame--tall{aspect-ratio:3/4}
.media-frame--square{aspect-ratio:1/1}
.media-caption{margin-top:8px;font-family:var(--font-mono);font-size:11px;letter-spacing:.04em;color:var(--dim)}

/* ===== 标签 ===== */
.tag{
  display:inline-flex;align-items:center;gap:6px;
  padding:3px 8px;border:1px solid var(--line);border-radius:var(--radius);
  font-family:var(--font-mono);font-size:11px;letter-spacing:.08em;text-transform:uppercase;color:var(--muted);
}
.tag--cyan{color:var(--cyan);border-color:rgba(53,230,224,.42);background:rgba(53,230,224,.08)}
.tag--orange{color:var(--orange);border-color:rgba(255,138,61,.42);background:rgba(255,138,61,.1)}

/* ===== 正文 ===== */
.prose{max-width:68ch;font-size:16px;line-height:1.8;color:#C8D8EA}
.prose h2,.prose h3{margin:1.6em 0 .6em;color:var(--text)}
.prose h2{font-size:clamp(20px,2.4vw,28px)}
.prose h3{font-size:18px}
.prose ul,.prose ol{margin:0 0 1em;padding-left:1.2em;list-style:disc}
.prose li{margin-bottom:.4em}
.prose a{color:var(--cyan-soft);text-decoration:underline;text-underline-offset:3px}
.prose a:hover{color:var(--cyan)}
.rule{height:1px;margin:32px 0;border:0;background:var(--line)}

/* ===== 显现 ===== */
.js-reveal [data-reveal]{opacity:0;transform:translateY(8px);transition:opacity .42s var(--ease),transform .42s var(--ease)}
.js-reveal [data-reveal].is-visible{opacity:1;transform:none}

/* ===== 返回顶部 ===== */
.to-top{
  position:fixed;right:20px;bottom:20px;z-index:70;
  display:inline-flex;align-items:center;gap:8px;
  padding:10px 14px;border:1px solid var(--line);border-radius:var(--radius);
  background:rgba(11,23,48,.94);color:var(--muted);
  font-family:var(--font-mono);font-size:11px;letter-spacing:.12em;cursor:pointer;
  transition:color .16s var(--ease),border-color .16s var(--ease),transform .16s var(--ease);
}
.to-top:hover{color:var(--cyan);border-color:var(--cyan);transform:translateY(-2px)}
.to-top[hidden]{display:none}

/* ===== 响应式 ===== */
@media (max-width:1080px){
  .nav-link{padding:10px 7px;font-size:13px}
  .nav-cta{margin-left:8px}
}
@media (max-width:900px){
  .header-main{min-height:64px;gap:12px}
  .nav-toggle{display:inline-flex}
  .site-nav{
    position:absolute;left:0;right:0;top:100%;
    display:none;flex-direction:column;align-items:stretch;gap:0;margin:0;
    padding:10px 24px 22px;background:var(--panel);
    border-bottom:1px solid var(--line);
    box-shadow:0 22px 48px rgba(0,0,0,.6);
  }
  .site-header[data-open="true"] .site-nav,
  .site-nav[data-open="true"]{display:flex}
  .nav-list{flex-direction:column;align-items:stretch;gap:0}
  .nav-list li+li{border-top:1px solid rgba(36,57,92,.6)}
  .nav-link{padding:14px 4px;font-size:15px;color:var(--text)}
  .nav-link::after{display:none}
  .nav-link[aria-current="page"]{padding-left:12px;background:rgba(53,230,224,.07);box-shadow:inset 3px 0 0 var(--cyan)}
  .nav-cta{width:100%;margin:16px 0 0;padding:12px 18px;font-size:14px}
  .header-utility{padding:8px 0 10px}
  .date-readout{margin-left:0}
  .footer-shell{grid-template-columns:1fr;gap:32px;padding-top:44px}
  .footer-brand{max-width:none}
  .split,.split--flip{grid-template-columns:1fr}
  .grid--3{grid-template-columns:repeat(2,minmax(0,1fr))}
  #main-content,[data-today-marker]{scroll-margin-top:112px}
}
@media (max-width:600px){
  .header-shell,.shell,.footer-shell{padding-left:16px;padding-right:16px}
  .brand-name{font-size:15px}
  .brand-sub{font-size:9px;letter-spacing:.2em}
  .chip{padding:4px 9px;font-size:11px}
  .chip[aria-pressed="true"]{padding-left:12px}
  .utility-label{letter-spacing:.16em}
  .grid--2,.grid--3{grid-template-columns:1fr}
  .footer-cols{gap:18px}
  .footer-legal{flex-direction:column;align-items:flex-start}
  .to-top{right:12px;bottom:12px;padding:8px 12px}
}
@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}
  .panel--interactive:hover,.btn:hover,.to-top:hover{transform:none}
}