:root{--bg:#0d1016;--bg-soft:#141922;--line:#ffffff17;--text:#e9ecf1;--muted:#9aa4b2;--accent:#7aa2ff;--radius:16px;--maxw:900px}*{box-sizing:border-box}body{background:var(--bg);color:var(--text);-webkit-text-size-adjust:100%;margin:0;font-family:system-ui,-apple-system,PingFang SC,Microsoft YaHei,sans-serif;font-size:16px;line-height:1.7}a{color:inherit;text-decoration:none}img{max-width:100%;height:auto;display:block}.site-header,.site-footer,main{max-width:var(--maxw);margin:0 auto;padding:0 20px}.site-header{justify-content:space-between;align-items:center;padding-top:22px;padding-bottom:22px;display:flex}.brand{letter-spacing:.02em;font-weight:700}.site-header nav{color:var(--muted);gap:18px;font-size:14px;display:flex}.site-header nav a:hover{color:var(--text)}.hero{padding:44px 0 30px}.hero h1{margin:0 0 10px;font-size:clamp(26px,5vw,40px);line-height:1.32}.hero p{color:var(--muted);max-width:52ch;margin:0}.cover{padding:58px 0 34px}.cover h1{margin:0 0 14px;font-size:clamp(28px,6vw,46px);line-height:1.24}.cover p{color:var(--muted);max-width:46ch;margin:0;font-size:17px}.cover-hint{margin:22px 0 40px}.feature{background:var(--bg-soft);border:1px solid var(--line);border-radius:var(--radius);grid-template-columns:1fr;transition:transform .15s,border-color .15s;display:grid;overflow:hidden}.feature:hover{border-color:#7aa2ff80;transform:translateY(-3px)}.feature-cover{aspect-ratio:16/10;object-fit:cover;background:#0a0d12;width:100%}.feature-body{flex-direction:column;align-items:flex-start;gap:10px;padding:18px 20px 22px;display:flex}.feature-body h2{margin:0;font-size:22px}.feature-body p{color:var(--muted);margin:0}@media (width>=760px){.feature{grid-template-columns:1.02fr 1fr;align-items:center}.feature-cover{aspect-ratio:auto;height:100%;min-height:260px}.feature-body{padding:30px 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table{border-collapse:collapse;width:100%;font-size:14px}.prose th,.prose td{border:1px solid var(--line);text-align:left;padding:8px 10px}.site-footer{border-top:1px solid var(--line);color:var(--muted);flex-wrap:wrap;justify-content:space-between;gap:12px;margin-top:24px;padding-top:22px;padding-bottom:40px;font-size:13px;display:flex}@media (width<=520px){.hero{padding-top:26px}.grid{grid-template-columns:1fr}}