@import url('https://fonts.googleapis.com/css2?family=Cormorant+Infant:wght@300;400;500;600;700&family=Great+Vibes&display=swap');

:root{--g:#00ff80;--b:#0000ff;--k:#000;--w:#fff;--mute:#9d9d9d;--edge:3px}
*,*::before,*::after{box-sizing:border-box}
html{background:var(--k);scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{margin:0;background:var(--k);color:var(--w);font-family:system-ui,-apple-system,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;font-size:17px;line-height:1.7;font-weight:400;overflow-x:hidden}
h1,h2,h3,h4{font-weight:800;line-height:1.15;letter-spacing:-.015em;margin:0 0 .5em}
p{margin:0 0 14px}
a{color:inherit;transition:none}
img{max-width:100%}
:focus-visible{outline:4px solid var(--g);outline-offset:3px}

/* 顶部胶囊导航 */
.site-head{position:sticky;top:0;z-index:60;background:var(--k);border-bottom:4px solid var(--g)}
.nav{display:flex;align-items:center;gap:8px;max-width:1240px;margin:0 auto;padding:10px 14px}
.nav-list{display:flex;flex-wrap:wrap;gap:8px;flex:1 1 0;margin:0;padding:0;list-style:none}
.nav-list--left{justify-content:flex-end}
.nav-list--right{justify-content:flex-start}
.nav-list a{display:inline-flex;align-items:center;min-height:40px;padding:2px 14px;border:2px solid var(--w);border-radius:999px;text-decoration:none;font-size:16px;font-weight:700;white-space:nowrap}
.nav-list a:hover,.nav-list a:focus-visible{background:var(--g);border-color:var(--k);color:var(--k)}
.brand{flex:0 0 auto;font-size:20px;font-weight:900;letter-spacing:.08em;color:var(--g);text-decoration:none;border:3px solid var(--g);padding:5px 12px;transform:rotate(-2deg);font-family:"Cormorant Infant",system-ui,sans-serif}
.brand:hover,.brand:focus-visible{background:var(--g);color:var(--k);transform:rotate(0)}

/* 首屏 */
.hero{position:relative;min-height:45vh;display:flex;align-items:center;justify-content:center;text-align:center;padding:48px 16px 64px;overflow:hidden;background-color:var(--b);background-image:radial-gradient(var(--g) 1.4px,transparent 1.5px);background-size:18px 18px}
.hero-fig{position:absolute;inset:0;margin:0;clip-path:polygon(0 0,100% 0,100% 84%,0 100%);overflow:hidden;background:var(--b)}
.hero-img{width:100%;height:100%;object-fit:cover;display:block;filter:grayscale(.15) contrast(1.08)}
.hero-in{position:relative;z-index:2;max-width:940px}
.hero h1{margin:0;font-size:clamp(30px,7vw,62px);color:var(--w);text-shadow:5px 5px 0 var(--k);letter-spacing:-.02em}
.subtitle{font-size:16px;line-height:1.6}
.hero-sub{display:inline-block;margin:16px 0 0;background:var(--w);color:var(--k);border:3px solid var(--k);border-radius:999px;padding:6px 16px;font-weight:700}

/* 左栏目次 + 右正文 */
.wrap{display:grid;grid-template-columns:272px minmax(0,1fr);gap:24px;max-width:1240px;margin:0 auto;padding:28px 14px 44px;align-items:start}
.side{position:sticky;top:88px;border:3px solid var(--g);border-radius:24px;background:#050505;padding:16px 16px 18px}
.side h2{margin:0 0 6px;font-size:19px;letter-spacing:.14em;color:var(--g)}
.side .subtitle{margin:0 0 14px;color:var(--mute);font-family:"Cormorant Infant",system-ui,sans-serif;font-weight:600}
.side-list{list-style:none;margin:0;padding:0;counter-reset:sn}
.side-list li{counter-increment:sn;border-bottom:2px dashed #232323}
.side-list li:last-child{border-bottom:0}
.side-list a{display:flex;align-items:center;gap:10px;min-height:44px;padding:6px 6px;border-radius:12px;text-decoration:none;font-size:16px;font-weight:600;line-height:1.4}
.side-list a::before{content:counter(sn,decimal-leading-zero);font-family:"Cormorant Infant",serif;font-weight:700;font-size:16px;color:var(--g);flex:0 0 auto}
.side-list a:hover,.side-list a:focus-visible,.side-list a.is-on{background:var(--g);color:var(--k)}
.side-list a:hover::before,.side-list a.is-on::before{color:var(--k)}
.side-top{display:inline-flex;align-items:center;min-height:44px;margin-top:14px;padding:0 16px;border:2px solid var(--w);border-radius:999px;text-decoration:none;font-size:16px;font-weight:700}
.side-top:hover,.side-top:focus-visible{background:var(--w);color:var(--k)}

/* 正文卡片 */
.content{min-width:0}
.content div{background:var(--w);color:var(--k);border:3px solid var(--k);border-bottom:10px solid var(--g);border-radius:28px;padding:26px 22px 18px;margin:0 0 22px;scroll-margin-top:96px}
.content div:target{outline:6px solid var(--g);outline-offset:4px}
.content h2{font-size:clamp(22px,3.6vw,31px)}
.content h2::before{content:"";display:block;width:56px;height:10px;background:var(--g);border:2px solid var(--k);margin:0 0 12px}
.content h3{font-size:20px;margin-top:22px}
.content p{margin:0 0 14px}
.content ul,.content ol{margin:0 0 14px;padding-left:1.4em}
.content li{margin:0 0 8px}
.content a{color:var(--b);font-weight:700;text-decoration:none;border-bottom:3px solid var(--g);word-break:break-word}
.content a:hover,.content a:focus-visible{background:var(--g);color:var(--k)}
.content strong{background:linear-gradient(transparent 62%,var(--g) 62%);font-weight:800}
.content blockquote{margin:0 0 16px;padding:12px 16px;border-left:8px solid var(--b);background:#f1f1f1;font-weight:600}
.content blockquote p:last-child{margin:0}
.content figure{margin:0 0 16px}
.content img{border:3px solid var(--k);border-radius:18px;display:block;height:auto}
.content figcaption{font-size:16px;color:#4a4a4a;padding-top:6px}
.content table{width:100%;border-collapse:collapse;margin:0 0 16px;font-size:16px}
.content th,.content td{border:2px solid var(--k);padding:8px 10px;text-align:left}
.content th{background:var(--g)}
.content hr{border:0;border-top:4px solid var(--k);margin:22px 0}

/* 页脚四栏 */
.foot{display:grid;grid-template-columns:1.3fr 1fr 1fr .9fr;gap:16px;max-width:1240px;margin:0 auto;padding:26px 14px 34px;border-top:4px solid var(--g);background:var(--k)}
.foot-brand{margin:0;font-size:20px;font-weight:900;letter-spacing:.06em;color:var(--g)}
.foot-brand a{text-decoration:none}
.foot-brand a:hover,.foot-brand a:focus-visible{background:var(--g);color:var(--k)}
.foot-col{margin:0;display:flex;flex-direction:column;font-size:16px}
.foot-col a{display:flex;align-items:center;min-height:40px;text-decoration:none;border-bottom:2px solid #1f1f1f;padding:2px 0;line-height:1.4}
.foot-col a:hover,.foot-col a:focus-visible{color:var(--g);border-color:var(--g)}
.foot-legal{align-self:end;font-size:16px;color:var(--mute);padding-bottom:6px}

@media (max-width:900px){
  .site-head{position:static}
  .nav{flex-wrap:wrap;padding:12px 12px 14px}
  .brand{order:-1;margin:0 auto 4px;font-size:19px}
  .nav-list{flex:1 1 100%;justify-content:center}
  .nav-list a{padding:2px 11px}
  .wrap{grid-template-columns:1fr;gap:18px;padding:18px 12px 32px}
  .side{position:static;order:-1}
  .content div{padding:20px 16px 14px;border-radius:22px;scroll-margin-top:14px}
  .foot{grid-template-columns:1fr 1fr;gap:12px}
  .foot-legal{grid-column:1 / -1;padding-top:6px}
  .hero{min-height:46vh;padding:36px 14px 52px}
}

@media (max-width:420px){
  .nav-list a{font-size:16px;padding:2px 9px}
  .foot{grid-template-columns:1fr}
}

@media (prefers-reduced-motion: reduce){
  html{scroll-behavior:auto}
  .brand{transform:none}
}

button[aria-expanded]{min-width:44px;min-height:44px}