:root{--navy: #10233f;--navy-2: #1c3558;--ink: #1c2733;--ink-soft: #55637a;--paper: #f5f7fa;--card: #ffffff;--teal: #0e9384;--teal-dark: #0b7468;--teal-soft: #e2f4f1;--coral: #d84a3a;--amber: #b7791f;--line: #e2e7ef;--line-strong: #cbd5e1;--mono: ui-monospace, "SF Mono", "Cascadia Code", Consolas, Menlo, monospace;--sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;font-family:var(--sans);color:var(--ink);background:linear-gradient(rgba(16,35,63,.028) 1px,transparent 1px),linear-gradient(90deg,rgba(16,35,63,.028) 1px,transparent 1px),var(--paper);background-size:28px 28px;line-height:1.65;font-size:16px}a{color:var(--teal-dark);text-decoration:none}a:hover{text-decoration:underline}.wrap{max-width:1040px;margin:0 auto;padding:0 22px}.site-head{background:var(--navy);color:#fff;border-bottom:3px solid var(--teal)}.site-head .wrap{display:flex;align-items:center;justify-content:space-between;gap:18px;padding-top:14px;padding-bottom:14px}.brand{font-family:var(--mono);font-weight:700;letter-spacing:.04em;color:#fff;display:inline-flex;align-items:center;gap:10px;font-size:1.15rem}.brand:hover{text-decoration:none;color:#d7fffb}.brand .mark{display:inline-grid;place-items:center;width:30px;height:30px;border-radius:7px;background:var(--teal);color:#04221e;font-size:.9rem}.site-nav{display:flex;gap:4px;flex-wrap:wrap}.site-nav a{color:#cdd8e6;padding:6px 11px;border-radius:6px;font-size:.9rem;font-family:var(--mono)}.site-nav a:hover{background:#ffffff14;color:#fff;text-decoration:none}.site-foot{margin-top:64px;background:var(--navy);color:#b9c6d8;padding:34px 0 40px;border-top:3px solid var(--teal)}.site-foot .foot-grid{display:grid;grid-template-columns:2fr 1fr 1fr;gap:26px;align-items:start}.site-foot h3{color:#fff;font-family:var(--mono);font-size:.8rem;letter-spacing:.12em;text-transform:uppercase;margin:0 0 12px}.site-foot a{color:#cdd8e6;display:block;padding:3px 0;font-size:.92rem}.site-foot a:hover{color:#fff}.foot-brand{font-family:var(--mono);font-weight:700;color:#fff;font-size:1rem}.foot-fine{margin:22px 0 0;font-size:.82rem;color:#7f8ea3;border-top:1px solid rgba(255,255,255,.12);padding-top:16px}.hero{background:var(--navy);color:#fff;padding:56px 0 48px;border-bottom:1px solid var(--navy-2)}.hero .kicker{font-family:var(--mono);color:var(--teal-soft);font-size:.82rem;letter-spacing:.16em;text-transform:uppercase;margin:0 0 12px}.hero h1{font-size:2.5rem;line-height:1.15;margin:0 0 16px;font-weight:800}.hero h1 .accent{color:#4fd8c8}.hero .lede{font-size:1.12rem;color:#cdd8e6;max-width:640px;margin:0 0 22px}.hero-meta{display:flex;gap:22px;flex-wrap:wrap;font-family:var(--mono);font-size:.85rem;color:#9fb1c8}.hero-meta span b{color:#fff;font-weight:700}.section-label{display:flex;align-items:baseline;gap:12px;margin:44px 0 18px}.section-label h2{font-size:1.3rem;margin:0;font-weight:800}.section-label .rule{flex:1;height:1px;background:var(--line-strong)}.cat-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:16px}.cat-card{background:var(--card);border:1px solid var(--line);border-top:3px solid var(--teal);border-radius:10px;padding:20px 20px 18px;display:block;color:var(--ink);transition:transform .12s ease,box-shadow .12s ease}.cat-card:hover{transform:translateY(-2px);box-shadow:0 8px 22px #10233f17;text-decoration:none}.cat-card .cat-head{display:flex;align-items:center;justify-content:space-between;gap:8px}.cat-card h3{margin:0;font-size:1.08rem;font-weight:700}.cat-card .count{font-family:var(--mono);font-size:.78rem;color:var(--teal-dark);background:var(--teal-soft);padding:2px 8px;border-radius:999px}.cat-card p{margin:8px 0 0;color:var(--ink-soft);font-size:.92rem}.concept-list{list-style:none;margin:0;padding:0;display:grid;gap:10px}.concept-row{display:flex;align-items:center;justify-content:space-between;gap:14px;background:var(--card);border:1px solid var(--line);border-radius:9px;padding:14px 18px}.concept-row:hover{border-color:var(--teal);text-decoration:none}.concept-row .cn{font-weight:700;color:var(--ink)}.concept-row .cn .zh{color:var(--ink-soft);font-weight:400;font-size:.85rem;margin-left:6px}.concept-row .tag{font-family:var(--mono);font-size:.74rem;color:var(--ink-soft);white-space:nowrap}.crumbs{background:var(--card);border-bottom:1px solid var(--line);font-size:.85rem}.crumbs .wrap{display:flex;gap:7px;align-items:center;padding-top:12px;padding-bottom:12px;color:var(--ink-soft);flex-wrap:wrap}.crumbs .sep{color:var(--line-strong)}.article-head{background:var(--navy);color:#fff;padding:40px 0 34px}.article-head .cat{font-family:var(--mono);color:#4fd8c8;font-size:.82rem;letter-spacing:.08em;text-transform:uppercase}.article-head h1{font-size:2.1rem;margin:8px 0 14px;line-height:1.15;font-weight:800}.article-head .meta{font-family:var(--mono);font-size:.85rem;color:#b9c6d8;display:flex;gap:18px;flex-wrap:wrap}.article-head .meta b{color:#fff;font-weight:600}.article-body{display:grid;grid-template-columns:300px 1fr;gap:30px;align-items:start;padding-top:30px;padding-bottom:30px}.spec{background:var(--card);border:1px solid var(--line);border-top:3px solid var(--navy-2);border-radius:10px;overflow:hidden;position:sticky;top:18px}.spec-head{background:var(--navy-2);color:#dff3f0;font-family:var(--mono);font-size:.78rem;letter-spacing:.1em;text-transform:uppercase;padding:11px 16px}.spec dl{margin:0}.spec .fact{padding:12px 16px;border-bottom:1px solid var(--line)}.spec .fact:last-child{border-bottom:0}.spec dt{font-family:var(--mono);font-size:.7rem;letter-spacing:.08em;text-transform:uppercase;color:var(--ink-soft);margin:0 0 3px}.spec dd{margin:0;font-size:.94rem}.spec dd a{font-family:var(--mono);font-size:.85rem}.spec .rel{display:flex;flex-direction:column;gap:5px}.spec .rel .soon{color:var(--ink-soft);font-family:var(--mono);font-size:.85rem}.spec .badge{display:inline-block;font-family:var(--mono);font-size:.78rem;padding:3px 9px;border-radius:6px}.spec .badge.b{background:var(--teal-soft);color:var(--teal-dark)}.spec .badge.i{background:#fdf0e6;color:var(--amber)}.content h2{font-size:1.28rem;margin:34px 0 12px;padding-top:6px;border-top:1px solid var(--line);color:var(--navy);font-weight:800}.content h2:first-of-type{margin-top:0;border-top:0}.content p{margin:0 0 16px}.content p:last-child{margin-bottom:0}.content strong{color:var(--navy)}.page-body{background:var(--card);border:1px solid var(--line);border-radius:10px;padding:30px 32px;margin-top:26px}.page-body h2{color:var(--navy);font-size:1.15rem;margin:24px 0 10px}.page-body h2:first-child{margin-top:0}.page-body p{margin:0 0 14px}.page-body a{text-decoration:underline}.notfound{text-align:center;padding:70px 0}.notfound .code{font-family:var(--mono);font-size:4rem;color:var(--navy);font-weight:800}.notfound h1{font-size:1.5rem;margin:8px 0 14px}.notfound .btn{display:inline-block;background:var(--teal);color:#fff;padding:11px 20px;border-radius:8px;font-family:var(--mono)}.notfound .btn:hover{background:var(--teal-dark);text-decoration:none}@media(max-width:860px){.article-body{grid-template-columns:1fr}.spec{position:static}.site-foot .foot-grid{grid-template-columns:1fr}.hero h1{font-size:2rem}}