:root{color-scheme:dark;--bg:#050814;--panel:#0a1424;--line:rgba(112,209,255,.18);--text:#edf9ff;--muted:#88a7b9;--accent:#62e6ff}*{box-sizing:border-box}body{margin:0;min-height:100vh;color:var(--text);background:radial-gradient(circle at 70% 10%,rgba(70,75,190,.22),transparent 34%),var(--bg);font-family:Inter,"Segoe UI","Microsoft YaHei",sans-serif}.knowledge-header{min-height:82px;padding:14px clamp(22px,5vw,80px);display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid var(--line)}.knowledge-header nav{display:flex;align-items:center;gap:14px}.knowledge-header a{color:inherit;text-decoration:none}.knowledge-brand{font-weight:800;letter-spacing:.18em}.knowledge-header nav>a{color:#a9c1cf}main{width:min(1040px,calc(100% - 44px));margin:0 auto;padding:clamp(70px,10vw,130px) 0}.knowledge-eyebrow{color:var(--accent);font:700 11px/1 ui-monospace,monospace;letter-spacing:.23em}h1{margin:14px 0;font-size:clamp(44px,7vw,82px);letter-spacing:-.05em}.knowledge-intro{max-width:650px;color:var(--muted);font-size:16px;line-height:1.9}.knowledge-empty{margin-top:56px;padding:30px;display:grid;grid-template-columns:60px 1fr;gap:22px;border:1px solid var(--line);border-radius:16px;background:rgba(10,20,36,.72)}.knowledge-empty>span{width:52px;height:52px;display:grid;place-items:center;border:1px solid rgba(98,230,255,.35);border-radius:12px;color:var(--accent);font:700 11px/1 ui-monospace,monospace}.knowledge-empty h2{margin:0 0 10px}.knowledge-empty p{margin:0;color:var(--muted);line-height:1.8}.knowledge-back{display:inline-flex;margin-top:28px;color:var(--accent)}@media(max-width:660px){.knowledge-header{align-items:flex-start}.knowledge-header nav{align-items:flex-end;flex-direction:column}.knowledge-empty{grid-template-columns:1fr}}