:root{--bg: #fafbfc;--surface: #ffffff;--surface-2: #f3f5f9;--ink: #0c1220;--ink-2: #2a3447;--muted: #5a6478;--subtle: #8b94a8;--line: #e8ebf2;--line-strong: #d8dde7;--primary: #2454ff;--primary-soft: #eef2ff;--sky: #38bdf8;--mint: #10b981;--amber: #f59e0b;--r-sm: 8px;--r: 14px;--r-lg: 22px;--r-pill: 999px;--container: 1200px;--font-sans: "Plus Jakarta Sans", "Noto Sans SC", ui-sans-serif, system-ui, -apple-system, sans-serif;--font-mono: "JetBrains Mono", "Noto Sans SC", ui-monospace, monospace;--shadow-card: 0 1px 0 rgba(12,18,32,.02), 0 8px 32px -12px rgba(12,18,32,.08);--shadow-elev: 0 1px 0 rgba(12,18,32,.04), 0 24px 60px -24px rgba(36,84,255,.18)}*,*:before,*:after{box-sizing:border-box}html,body{margin:0;padding:0}html{scroll-behavior:smooth}body{font-family:var(--font-sans);background:var(--bg);color:var(--ink);font-size:16px;line-height:1.6;-webkit-font-smoothing:antialiased}a{color:inherit;text-decoration:none}h1,h2,h3{margin:0;font-weight:700;letter-spacing:-.022em;line-height:1.15}.ink-dim{color:var(--subtle)}.lede{font-size:clamp(15.5px,1.2vw,18px);color:var(--muted);line-height:1.65;max-width:62ch}.mono{font-family:var(--font-mono);font-variant-numeric:tabular-nums}.mono-up{font-family:var(--font-mono);font-size:11px;letter-spacing:.08em;text-transform:uppercase;color:var(--muted)}.subtle{color:var(--subtle)}.container{max-width:var(--container);margin:0 auto;padding:0 32px}.pill{display:inline-flex;align-items:center;gap:8px;padding:6px 12px 6px 10px;border-radius:var(--r-pill);background:#0c12200a;border:1px solid var(--line);font-size:13px;color:var(--ink-2);font-weight:500}.btn{display:inline-flex;align-items:center;gap:8px;padding:12px 18px;border-radius:var(--r-pill);font-size:14.5px;font-weight:600;cursor:pointer;border:1px solid transparent;background:transparent;color:var(--ink);font-family:inherit;transition:transform .12s ease,background .14s ease,color .14s ease,border-color .14s ease,box-shadow .2s ease;white-space:nowrap}.btn:hover{transform:translateY(-1px)}.btn-primary{background:var(--ink);color:#fff;box-shadow:0 6px 18px -8px #0c122073}.btn-primary:hover{background:#1a2238}.btn-sm{padding:8px 14px;font-size:13px}.hc-hero{position:relative;padding:24px 0 48px;isolation:isolate;overflow:hidden}.hc-hero-bg{position:absolute;inset:0;pointer-events:none;z-index:-1}.hc-hero-grid{position:absolute;inset:-2px;background-image:linear-gradient(to right,rgba(12,18,32,.05) 1px,transparent 1px),linear-gradient(to bottom,rgba(12,18,32,.05) 1px,transparent 1px);background-size:80px 80px;mask-image:radial-gradient(ellipse 70% 70% at 50% 30%,#000 30%,transparent 75%);-webkit-mask-image:radial-gradient(ellipse 70% 70% at 50% 30%,#000 30%,transparent 75%)}.hc-hero-spot{position:absolute;inset:-10%;background:radial-gradient(40% 40% at 50% 0%,rgba(56,189,248,.16),transparent 60%),radial-gradient(35% 30% at 70% 30%,rgba(36,84,255,.1),transparent 70%)}.hc-hero-head{display:flex;flex-direction:column;align-items:center;text-align:center;gap:18px;padding-top:60px}.hc-title{font-size:clamp(40px,5.4vw,72px);font-weight:800;letter-spacing:-.03em;line-height:1.04;margin:0;max-width:22ch}.hc-lede{text-align:center;max-width:56ch;margin:0}.hc-search{margin:36px auto 0;max-width:720px;display:flex;align-items:center;gap:12px;padding:14px 18px;background:var(--surface);border:1px solid var(--line);border-radius:999px;box-shadow:var(--shadow-elev);color:var(--subtle)}.hc-search:focus-within{border-color:var(--primary);box-shadow:0 0 0 4px #2454ff1a,var(--shadow-elev)}.hc-search svg{flex-shrink:0}.hc-search input{flex:1;border:0;outline:0;background:transparent;font:500 15.5px var(--font-sans);color:var(--ink);font-family:inherit}.hc-search input::placeholder{color:var(--subtle)}.hc-search input:disabled{cursor:not-allowed}.hc-search:has(input:disabled){background:var(--surface-2);border-color:var(--line);box-shadow:none}.hc-kbd{padding:3px 8px;background:var(--surface-2);border:1px solid var(--line);border-radius:6px;font-size:11px;color:var(--muted)}.hc-quick{margin:28px 0 0;display:grid;grid-template-columns:repeat(4,1fr);gap:12px}.hc-quick-card{display:grid;grid-template-columns:32px 1fr 16px;align-items:center;gap:12px;padding:14px 16px;background:var(--surface);border:1px solid var(--line);border-radius:14px;color:var(--ink);text-align:left;cursor:pointer;font-family:inherit;transition:transform .16s ease,border-color .16s ease,box-shadow .16s ease}.hc-quick-card:hover{transform:translateY(-2px);border-color:#2454ff4d;box-shadow:0 1px #0c122008,0 14px 28px -16px #2454ff4d}.hc-quick-icon{width:32px;height:32px;border-radius:10px;background:var(--primary-soft);color:var(--primary);display:grid;place-items:center}.hc-quick-label{font-size:14px;font-weight:600;letter-spacing:-.005em}.hc-quick-card svg:last-child{color:var(--subtle)}.hc-quick-card:hover svg:last-child{color:var(--primary)}.hc-tabs-bar{position:sticky;top:60px;z-index:30;background:#fafbfcd9;backdrop-filter:saturate(140%) blur(14px);-webkit-backdrop-filter:saturate(140%) blur(14px);border-bottom:1px solid var(--line)}.hc-tabs{display:flex;gap:4px;padding:8px 0;overflow-x:auto}.hc-tab{padding:10px 18px;border:0;background:transparent;cursor:pointer;font:600 14px var(--font-sans);color:var(--muted);border-radius:999px;font-family:inherit;transition:color .12s ease,background .12s ease;white-space:nowrap}.hc-tab:hover{color:var(--ink);background:#2454ff0a}.hc-tab.is-active{color:#fff;background:var(--ink)}.hc-section{padding:48px 0 96px}.g-wrap{display:grid;grid-template-columns:240px 1fr;gap:48px;align-items:start}.g-side{position:sticky;top:130px;display:flex;flex-direction:column;gap:2px}.g-side-h{color:var(--subtle);padding:8px 12px}.g-side-i{display:flex;justify-content:space-between;align-items:center;padding:10px 12px;font-size:13.5px;font-weight:500;color:var(--ink-2);border-radius:10px;text-decoration:none;transition:background .12s ease,color .12s ease}.g-side-i:hover{background:var(--surface-2);color:var(--ink)}.g-side-i.is-active{background:var(--ink);color:#fff}.g-side-i.is-active .g-side-c{color:#fff9}.g-side-c{color:var(--subtle);font-size:11.5px}.g-help-card{display:flex;gap:12px;align-items:center;padding:12px 14px;background:var(--surface);border:1px solid var(--line);border-radius:12px;text-decoration:none;color:var(--ink);transition:border-color .16s ease}.g-help-card:hover{border-color:#2454ff4d}.g-help-icon{width:32px;height:32px;border-radius:8px;background:var(--primary-soft);color:var(--primary);display:grid;place-items:center;flex-shrink:0}.g-main{display:flex;flex-direction:column;gap:48px}.g-head{display:flex;flex-direction:column;gap:8px;padding-bottom:24px;border-bottom:1px solid var(--line)}.g-head h2{font-size:36px;font-weight:700;letter-spacing:-.025em;margin:0}.g-sec{scroll-margin-top:130px}.g-sec-h{display:flex;align-items:center;gap:12px;font-size:14px;font-weight:600;letter-spacing:.04em;text-transform:uppercase;color:var(--ink-2);margin:0 0 12px}.g-sec-pip{width:8px;height:8px;border-radius:999px;background:var(--primary);box-shadow:0 0 0 3px #2454ff26}.g-list{display:flex;flex-direction:column;gap:12px}.g-art{display:flex;flex-direction:column;background:var(--surface);border:1px solid var(--line);border-radius:14px;color:var(--ink);scroll-margin-top:130px;transition:border-color .16s ease,box-shadow .16s ease}.g-art:hover{border-color:#2454ff4d;box-shadow:0 1px #0c122008,0 14px 28px -16px #2454ff2e}.g-art:target{border-color:#2454ff8c;box-shadow:0 0 0 4px #2454ff14}.g-art[hidden]{display:none}.g-art-head{display:grid;grid-template-columns:40px 1fr;align-items:start;gap:16px;padding:18px 22px 16px}.g-art-anchor{display:inline-flex;padding-top:2px;text-decoration:none}.g-art-num{font:700 14px var(--font-mono);color:var(--subtle);line-height:1.6}.g-art-body{display:flex;flex-direction:column;gap:6px;min-width:0}.g-art-title-link{text-decoration:none;color:inherit;display:inline-block}.g-art-title{font-size:15.5px;font-weight:600;letter-spacing:-.005em;color:var(--ink)}.g-art-title-link:hover .g-art-title{color:var(--primary)}.g-art-meta{display:flex;align-items:center;gap:12px;font-size:12px;color:var(--muted)}.g-art-meta span{display:inline-flex;align-items:center;gap:4px}.g-art-meta svg{color:var(--subtle)}.g-art-lvl{padding:1px 7px;border-radius:4px;font:600 10.5px var(--font-mono);letter-spacing:.04em}.g-art-lvl.lvl-入门{background:#10b9811a;color:#047857}.g-art-lvl.lvl-进阶{background:#2454ff1a;color:#1e3a8a}.g-art-lvl.lvl-高级{background:#f59e0b1f;color:#b45309}.g-art-summary{margin:4px 0 0;font-size:14px;line-height:1.7;color:var(--ink-2)}.g-art-details{border-top:1px dashed var(--line);padding:0 22px}.g-art-details[open]{padding-bottom:18px}.g-art-toggle{display:flex;align-items:center;justify-content:space-between;gap:8px;padding:12px 0;cursor:pointer;font:600 12.5px var(--font-mono);letter-spacing:.06em;text-transform:uppercase;color:var(--primary);list-style:none}.g-art-toggle::-webkit-details-marker{display:none}.g-art-toggle:hover{color:#1a3ed8}.g-art-toggle-icon{transition:transform .22s cubic-bezier(.2,.7,.2,1);color:currentColor}.g-art-details[open] .g-art-toggle-icon{transform:rotate(180deg)}.g-art-content{display:flex;flex-direction:column;gap:18px;padding-top:4px}.g-art-block{display:flex;flex-direction:column;gap:8px}.g-art-block-h{color:var(--subtle)}.g-art-steps,.g-art-notes{margin:0;padding-left:20px;display:flex;flex-direction:column;gap:8px;font-size:14px;line-height:1.7;color:var(--ink-2)}.g-art-steps li::marker{color:var(--primary);font-weight:700}.g-art-notes li::marker{color:var(--amber)}.g-no-result,.pe-icon{display:flex}.g-no-result{padding:56px 16px;text-align:center;flex-direction:column;align-items:center;gap:8px}.pe-icon{width:36px;height:36px;place-items:center;border-radius:999px;background:var(--surface-2);color:var(--amber);font-weight:800;font-size:18px}.pe-title{font-weight:700;font-size:16px;color:var(--ink)}.pe-sub{color:var(--muted);font-size:13.5px;max-width:50ch}.faq-grid{display:flex;flex-direction:column;gap:40px}.faq-group[hidden]{display:none}.faq-cat{display:flex;align-items:center;gap:12px;font-size:14px;font-weight:600;letter-spacing:.04em;text-transform:uppercase;color:var(--ink-2);margin:0 0 12px}.faq-pip{width:8px;height:8px;border-radius:999px;background:var(--primary);box-shadow:0 0 0 3px #2454ff26}.faq-items{background:var(--surface);border:1px solid var(--line);border-radius:var(--r-lg);overflow:hidden}.faq-item{border-top:1px solid var(--line)}.faq-item:first-child{border-top:0}.faq-item[hidden]{display:none}.faq-q{display:flex;width:100%;align-items:center;justify-content:space-between;padding:18px 22px;background:transparent;border:0;cursor:pointer;font:600 15px var(--font-sans);color:var(--ink);text-align:left;letter-spacing:-.005em;gap:18px;font-family:inherit}.faq-q:hover{background:#2454ff08}.faq-q-text{flex:1}.faq-q-icon{flex-shrink:0;width:28px;height:28px;display:grid;place-items:center;border-radius:8px;background:var(--surface-2);color:var(--muted);transition:transform .2s ease,background .2s ease,color .2s ease}.faq-item.is-open .faq-q-icon{transform:rotate(180deg);background:var(--primary);color:#fff}.faq-a-wrap{display:grid;grid-template-rows:0fr;transition:grid-template-rows .24s cubic-bezier(.2,.7,.2,1)}.faq-item.is-open .faq-a-wrap{grid-template-rows:1fr}.faq-a{overflow:hidden;padding:0 22px;color:var(--ink-2);font-size:14.5px;line-height:1.75}.faq-item.is-open .faq-a{padding:0 22px 22px}.doc-wrap{display:grid;grid-template-columns:260px 1fr;gap:48px;align-items:start}.doc-side{position:sticky;top:130px;display:flex;flex-direction:column;gap:2px}.doc-meta{padding:14px 16px;background:var(--surface-2);border-radius:12px;margin-bottom:16px}.doc-meta-row{display:flex;justify-content:space-between;align-items:center;padding:6px 0;font-size:11.5px;color:var(--muted)}.doc-meta-row b{color:var(--ink);font-weight:600}.doc-meta-row+.doc-meta-row{border-top:1px dashed var(--line)}.doc-side-h{color:var(--subtle);padding:12px 12px 8px}.doc-side-i{padding:8px 12px;font-size:13px;color:var(--ink-2);border-radius:8px;text-decoration:none;transition:background .12s ease,color .12s ease}.doc-side-i:hover{background:var(--surface-2);color:var(--primary)}.doc-main{display:flex;flex-direction:column;gap:32px;max-width:760px}.doc-head{display:flex;flex-direction:column;gap:8px;padding-bottom:24px;border-bottom:1px solid var(--line)}.doc-head h2{font-size:36px;font-weight:700;letter-spacing:-.025em;margin:0}.doc-prin{padding:24px;background:radial-gradient(60% 60% at 0% 0%,rgba(56,189,248,.1),transparent 60%),radial-gradient(60% 60% at 100% 100%,rgba(36,84,255,.08),transparent 60%),var(--surface);border:1px solid rgba(36,84,255,.2);border-radius:var(--r-lg)}.doc-prin-h{color:var(--primary);margin-bottom:14px}.doc-prin-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:14px}.doc-prin-c{display:flex;flex-direction:column;gap:4px;padding:12px 14px;background:var(--surface);border-radius:12px}.doc-prin-k{font:700 14px var(--font-sans);letter-spacing:-.01em;color:var(--ink)}.doc-prin-v{font-size:13px;color:var(--muted);line-height:1.6}.doc-sec{display:flex;flex-direction:column;gap:10px;scroll-margin-top:130px}.doc-sec-h{font-size:20px;font-weight:700;letter-spacing:-.01em;margin:0;color:var(--ink)}.doc-sec-p{font-size:15.5px;color:var(--ink-2);line-height:1.8;margin:0}.doc-foot{padding-top:28px;border-top:1px solid var(--line);display:flex;gap:8px;flex-wrap:wrap;color:var(--muted)}@media(max-width:960px){.g-wrap,.doc-wrap{grid-template-columns:1fr;gap:28px}.g-side,.doc-side{position:static}.hc-quick{grid-template-columns:repeat(2,1fr)}}@media(max-width:560px){.container{padding:0 18px}.hc-quick,.doc-prin-grid{grid-template-columns:1fr}}