:root{--bg: #ffffff;--bg-soft: #f7f8fa;--bg-elevated: #ffffff;--border: #e5e7eb;--border-strong: #d1d5db;--text: #1f2328;--text-soft: #57606a;--text-dim: #8b949e;--brand: #42b883;--brand-dark: #369e6f;--brand-soft: #eaf7f0;--accent: #35495e;--code-bg: #f6f8fa;--shadow-sm: 0 1px 2px rgba(16, 24, 40, .05);--shadow-md: 0 4px 16px rgba(16, 24, 40, .08);--radius: 10px;--mono: "JetBrains Mono", "Cascadia Code", "Fira Code", Consolas, "Courier New", monospace;--sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Helvetica Neue", Arial, sans-serif;--sidebar-w: 264px;--topbar-h: 56px;--tok-keyword: #cf222e;--tok-string: #0a3069;--tok-number: #0550ae;--tok-comment: #6e7781;--tok-tag: #116329;--tok-attr: #0550ae;--tok-directive: #8250df;--tok-interp: #953800;--tok-fn: #8250df;--tok-punct: #57606a;--tok-value: #0a3069}[data-theme=dark]{--bg: #0d1117;--bg-soft: #161b22;--bg-elevated: #161b22;--border: #30363d;--border-strong: #3d444d;--text: #e6edf3;--text-soft: #9ea7b3;--text-dim: #6e7681;--brand: #3fb950;--brand-dark: #46c25c;--brand-soft: #12261a;--accent: #58a6ff;--code-bg: #161b22;--shadow-sm: 0 1px 2px rgba(0, 0, 0, .4);--shadow-md: 0 4px 16px rgba(0, 0, 0, .5);--tok-keyword: #ff7b72;--tok-string: #a5d6ff;--tok-number: #79c0ff;--tok-comment: #8b949e;--tok-tag: #7ee787;--tok-attr: #79c0ff;--tok-directive: #d2a8ff;--tok-interp: #ffa657;--tok-fn: #d2a8ff;--tok-punct: #8b949e;--tok-value: #a5d6ff}.theme-switching *,.theme-switching *:before,.theme-switching *:after{transition:none!important}*{box-sizing:border-box}html,body{margin:0;padding:0}body{background:var(--bg);color:var(--text);font-family:var(--sans);font-size:15px;line-height:1.75;-webkit-font-smoothing:antialiased}a{color:var(--brand-dark);text-decoration:none}a:hover{text-decoration:underline}::selection{background:#42b88340}.layout{min-height:100vh}.topbar{position:sticky;top:0;z-index:50;height:var(--topbar-h);display:flex;align-items:center;gap:12px;padding:0 20px;background:color-mix(in srgb,var(--bg) 88%,transparent);-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);border-bottom:1px solid var(--border)}.brand{display:flex;align-items:center;gap:8px;color:var(--text);font-size:15px;letter-spacing:.2px}.brand:hover{text-decoration:none}.logo{font-size:18px}.topbar-right{margin-left:auto;display:flex;align-items:center;gap:10px}.top-link{color:var(--text-soft);font-size:14px;padding:5px 10px;border-radius:6px}.top-link:hover{background:var(--bg-soft);color:var(--text);text-decoration:none}.progress-pill{font-size:12px;font-variant-numeric:tabular-nums;color:var(--brand-dark);background:var(--brand-soft);border:1px solid color-mix(in srgb,var(--brand) 30%,transparent);padding:2px 9px;border-radius:999px;font-weight:600}.icon-btn{background:transparent;border:1px solid transparent;border-radius:7px;font-size:16px;line-height:1;padding:7px 9px;cursor:pointer;color:var(--text-soft)}.icon-btn:hover{background:var(--bg-soft);border-color:var(--border)}.menu-btn{display:none}.body{display:flex;align-items:flex-start}.sidebar{position:sticky;top:var(--topbar-h);flex:0 0 var(--sidebar-w);width:var(--sidebar-w);height:calc(100vh - var(--topbar-h));overflow-y:auto;padding:16px 10px 40px;border-right:1px solid var(--border);background:var(--bg)}.sidebar nav{display:flex;flex-direction:column;gap:2px}.nav-item,.nav-home{display:flex;align-items:center;gap:9px;padding:7px 10px;border-radius:7px;color:var(--text-soft);font-size:13.5px;line-height:1.45}.nav-item:hover,.nav-home:hover{background:var(--bg-soft);color:var(--text);text-decoration:none}.nav-item.active,.nav-home.active{background:var(--brand-soft);color:var(--brand-dark);font-weight:600}.nav-item.done .num{color:var(--brand)}.num{flex:0 0 20px;font-family:var(--mono);font-size:11px;color:var(--text-dim);font-variant-numeric:tabular-nums}.nav-title{flex:1}.nav-home{margin:2px 0 8px;font-weight:600;color:var(--text)}.backdrop{display:none}.main{flex:1 1 auto;min-width:0;max-width:900px;margin:0 auto;padding:36px 40px 120px}.hero{display:grid;grid-template-columns:1.35fr 1fr;gap:32px;align-items:center;padding:20px 0 44px;border-bottom:1px solid var(--border)}.hero-kicker{display:inline-block;font-size:12px;font-weight:600;letter-spacing:1px;text-transform:uppercase;color:var(--brand-dark);background:var(--brand-soft);padding:3px 10px;border-radius:999px;margin-bottom:14px}.hero h1{font-size:42px;line-height:1.15;margin:0 0 16px;letter-spacing:-1px}.grad{background:linear-gradient(120deg,#42b883,#347474 60%,#35495e);-webkit-background-clip:text;background-clip:text;-webkit-text-fill-color:transparent}.hero-sub{font-size:16px;color:var(--text-soft);margin:0 0 24px;max-width:46ch}.hero-actions{display:flex;gap:12px;flex-wrap:wrap}.btn{display:inline-block;padding:9px 18px;border-radius:8px;border:1px solid var(--border-strong);background:var(--bg-elevated);color:var(--text);font-size:14px;font-weight:500;cursor:pointer;transition:all .15s}.btn:hover{border-color:var(--brand);color:var(--brand-dark);text-decoration:none}.btn-primary{background:var(--brand);border-color:var(--brand);color:#fff;font-weight:600}.btn-primary:hover{background:var(--brand-dark);border-color:var(--brand-dark);color:#fff}.hero-card{background:var(--code-bg);border:1px solid var(--border);border-radius:12px;padding:20px;font-family:var(--mono);font-size:12.5px;line-height:2;box-shadow:var(--shadow-md);overflow-x:auto;scrollbar-width:none}.hero-card::-webkit-scrollbar{display:none}.hero-card-line{white-space:pre;color:var(--text-soft)}.hero-card-line code{color:var(--tok-keyword)}.hero-card-line span{color:var(--tok-string)}.hero-card-line span.n{color:var(--tok-number)}.hero-card-foot{margin-top:10px;padding-top:10px;border-top:1px dashed var(--border);font-family:var(--sans);font-size:12px;color:var(--text-dim)}.section{padding:40px 0 0}.section-title{font-size:20px;margin:0 0 20px;display:flex;align-items:baseline;gap:12px;flex-wrap:wrap}.section-hint{font-size:13px;font-weight:400;color:var(--text-dim)}.tracks{display:grid;grid-template-columns:1fr 1fr;gap:18px}.track{border:1px solid var(--border);border-radius:var(--radius);padding:18px 20px;background:var(--bg-soft)}.track h3{margin:0 0 6px;font-size:15px}.track p{margin:0 0 12px;font-size:13px;color:var(--text-soft)}.track ol{margin:0;padding-left:18px;font-size:13.5px}.track li{margin-bottom:3px}.missing{color:var(--text-dim)}.cards{display:grid;grid-template-columns:repeat(auto-fill,minmax(250px,1fr));gap:14px}.card{display:block;border:1px solid var(--border);border-radius:var(--radius);padding:16px;background:var(--bg-elevated);color:var(--text);transition:border-color .15s,transform .15s,box-shadow .15s}.card:hover{border-color:var(--brand);transform:translateY(-2px);box-shadow:var(--shadow-md);text-decoration:none}.card-top{display:flex;justify-content:space-between;align-items:center;margin-bottom:8px}.card-num{font-family:var(--mono);font-size:12px;font-weight:700;color:var(--brand);background:var(--brand-soft);padding:1px 7px;border-radius:5px}.card-min{font-size:11.5px;color:var(--text-dim)}.card-title{margin:0 0 6px;font-size:15px}.card-summary{margin:0 0 10px;font-size:12.5px;line-height:1.6;color:var(--text-soft);min-height:40px}.card-tags{display:flex;flex-wrap:wrap;gap:5px}.tag{font-size:11px;color:var(--text-soft);background:var(--bg-soft);border:1px solid var(--border);padding:1px 7px;border-radius:999px}.howto{display:flex;flex-direction:column;gap:14px}.howto-item{display:flex;gap:14px;align-items:flex-start}.howto-num{flex:0 0 26px;height:26px;border-radius:50%;background:var(--brand-soft);color:var(--brand-dark);font-weight:700;font-size:13px;display:grid;place-items:center}.howto-item h4{margin:0 0 3px;font-size:14px}.howto-item p{margin:0;font-size:13px;color:var(--text-soft)}.crumbs{display:flex;gap:8px;font-size:12.5px;color:var(--text-dim);margin-bottom:14px}.chapter-head{padding-bottom:22px;border-bottom:1px solid var(--border);margin-bottom:26px}.chapter-head h1{font-size:30px;margin:0 0 10px;letter-spacing:-.5px;line-height:1.25}.chapter-summary{margin:0 0 14px;color:var(--text-soft);font-size:15px}.chapter-meta{display:flex;align-items:center;gap:8px;flex-wrap:wrap;font-size:12.5px;color:var(--text-dim)}.pager{display:flex;gap:14px;margin-top:56px;padding-top:24px;border-top:1px solid var(--border)}.pager-link{flex:1;display:flex;flex-direction:column;gap:3px;padding:12px 16px;border:1px solid var(--border);border-radius:var(--radius);color:var(--text);transition:border-color .15s}.pager-link:hover{border-color:var(--brand);text-decoration:none}.pager-link.next{text-align:right}.pager-link.disabled{border:none;visibility:hidden}.pager-dir{font-size:11.5px;color:var(--text-dim)}.pager-title{font-size:14px;font-weight:600}.md-body{font-size:15px;line-height:1.8}.md-h2{font-size:22px;margin:42px 0 14px;padding-bottom:8px;border-bottom:1px solid var(--border);scroll-margin-top:76px}.md-h3{font-size:17px;margin:30px 0 10px;scroll-margin-top:76px}.md-h4{font-size:15px;margin:22px 0 8px;color:var(--text-soft)}.md-p{margin:0 0 14px}.md-ul,.md-ol{margin:0 0 16px;padding-left:22px}.md-ul li,.md-ol li{margin-bottom:5px}.md-hr{border:none;border-top:1px solid var(--border);margin:32px 0}.md-quote{margin:0 0 18px;padding:10px 16px;border-left:3px solid var(--border-strong);background:var(--bg-soft);color:var(--text-soft);border-radius:0 8px 8px 0}.md-quote p{margin:0}.inline-code{font-family:var(--mono);font-size:.875em;background:var(--code-bg);border:1px solid var(--border);padding:1.5px 5px;border-radius:5px;color:var(--tok-interp);white-space:nowrap}.md-table{width:100%;border-collapse:collapse;margin:0 0 18px;font-size:13.5px}.md-table th,.md-table td{border:1px solid var(--border);padding:7px 11px;text-align:left}.md-table th{background:var(--bg-soft);font-weight:600}.callout{border-radius:var(--radius);padding:12px 16px;margin:0 0 18px;border:1px solid var(--border);border-left-width:3px;background:var(--bg-soft)}.callout-head{font-size:12.5px;font-weight:700;margin-bottom:4px;letter-spacing:.3px}.callout-body p:last-child{margin-bottom:0}.callout-body>*:last-child{margin-bottom:0}.callout-tip{border-left-color:var(--brand);background:var(--brand-soft)}.callout-tip .callout-head{color:var(--brand-dark)}.callout-warn{border-left-color:#d29922;background:color-mix(in srgb,#d29922 8%,var(--bg))}.callout-warn .callout-head{color:#b07d10}.callout-think{border-left-color:#8250df;background:color-mix(in srgb,#8250df 7%,var(--bg))}.callout-think .callout-head{color:#8250df}.callout-action{border-left-color:#0969da;background:color-mix(in srgb,#0969da 7%,var(--bg))}.callout-action .callout-head{color:#0969da}.callout-note{border-left-color:var(--border-strong)}.callout-note .callout-head{color:var(--text-soft)}.code-block{margin:0 0 18px;border:1px solid var(--border);border-radius:var(--radius);overflow:hidden;background:var(--code-bg)}.code-head{display:flex;align-items:center;gap:10px;padding:6px 10px 6px 12px;border-bottom:1px solid var(--border);background:color-mix(in srgb,var(--bg-soft) 60%,var(--code-bg));font-size:11.5px;color:var(--text-dim)}.code-title{font-family:var(--mono);color:var(--text-soft)}.code-lang{margin-left:auto;text-transform:uppercase;letter-spacing:.6px;font-size:10.5px;font-weight:600;opacity:.75}.copy-btn{border:1px solid var(--border);background:var(--bg);color:var(--text-soft);font-size:11px;padding:2px 8px;border-radius:5px;cursor:pointer;font-family:var(--sans)}.copy-btn:hover{border-color:var(--brand);color:var(--brand-dark)}.code-pre{margin:0;padding:14px 16px;overflow-x:auto;font-family:var(--mono);font-size:12.8px;line-height:1.7;tab-size:2}.code-pre code{font-family:inherit}.tok-keyword{color:var(--tok-keyword)}.tok-string{color:var(--tok-string)}.tok-number{color:var(--tok-number)}.tok-comment{color:var(--tok-comment);font-style:italic}.tok-tag{color:var(--tok-tag)}.tok-attr{color:var(--tok-attr)}.tok-directive{color:var(--tok-directive)}.tok-interp{color:var(--tok-interp)}.tok-fn{color:var(--tok-fn)}.tok-punct{color:var(--tok-punct)}.tok-value{color:var(--tok-value)}.demo{margin:0 0 22px;border:1px solid var(--border);border-radius:var(--radius);overflow:hidden;background:var(--bg-elevated);box-shadow:var(--shadow-sm)}.demo-head{display:flex;align-items:center;gap:10px;padding:7px 12px;background:var(--bg-soft);border-bottom:1px solid var(--border);font-size:12px}.demo-badge{color:var(--brand-dark);background:var(--brand-soft);border-radius:999px;padding:1px 9px;font-size:11px;font-weight:700;white-space:nowrap}.demo-title{font-weight:600;color:var(--text)}.demo-file{font-family:var(--mono);font-size:11px;color:var(--text-dim);background:transparent}.demo-toggle{margin-left:auto;border:1px solid var(--border);background:var(--bg);color:var(--text-soft);border-radius:6px;padding:2px 10px;font-size:11.5px;cursor:pointer;white-space:nowrap}.demo-toggle:hover{border-color:var(--brand);color:var(--brand-dark)}.demo-body{padding:18px}.demo-loading,.demo-error{font-size:13px;color:var(--text-dim);padding:6px 0}.demo-error{color:#cf222e}.demo-source{border-top:1px solid var(--border);position:relative;background:var(--code-bg)}.demo-source .code-pre{max-height:460px;overflow:auto}.demo-copy{position:absolute;top:8px;right:10px;z-index:2}.not-found{padding:60px 0;text-align:center}.demo-body button,.demo-body input,.demo-body select,.demo-body textarea{font-family:inherit;font-size:13.5px}.btn-demo{padding:5px 13px;border-radius:7px;border:1px solid var(--border-strong);background:var(--bg);color:var(--text);cursor:pointer;font-size:13px}.btn-demo:hover{border-color:var(--brand);color:var(--brand-dark)}.btn-demo.primary{background:var(--brand);border-color:var(--brand);color:#fff;font-weight:600}.btn-demo.primary:hover{background:var(--brand-dark);color:#fff}.field{padding:5px 10px;border-radius:7px;border:1px solid var(--border-strong);background:var(--bg);color:var(--text);outline:none}.field:focus{border-color:var(--brand);box-shadow:0 0 0 3px #42b88326}.row{display:flex;align-items:center;gap:10px;flex-wrap:wrap}.hint{font-size:12px;color:var(--text-dim)}.mono{font-family:var(--mono)}@media(max-width:1000px){.hero,.tracks{grid-template-columns:1fr}}@media(max-width:860px){.menu-btn{display:block}.sidebar{position:fixed;top:var(--topbar-h);left:0;z-index:40;transform:translate(-100%);transition:transform .2s;box-shadow:var(--shadow-md)}.sidebar.open{transform:translate(0)}.backdrop{display:block;position:fixed;inset:var(--topbar-h) 0 0 0;z-index:30;background:#00000059}.main{padding:24px 18px 90px}.hero h1{font-size:32px}.progress-pill{display:none}}
