:root{--bg: #f6f7f9;--surface: #ffffff;--surface-2: #f1f3f6;--text: #1c2330;--text-muted: #5d6b7e;--border: #e4e8ee;--accent: #2563eb;--accent-strong: #1d4ed8;--accent-soft: #eef3ff;--success: #0f9d6e;--success-soft: #e9f9f2;--danger: #dc2626;--danger-soft: #fef0f0;--font: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", system-ui, -apple-system, sans-serif;--mono: ui-monospace, "SF Mono", "Cascadia Code", Consolas, monospace;--radius: 12px;--radius-sm: 8px;--shadow: 0 1px 2px rgba(28, 35, 48, .05), 0 8px 24px rgba(28, 35, 48, .06);--shadow-hover: 0 2px 4px rgba(28, 35, 48, .06), 0 14px 32px rgba(28, 35, 48, .1);--container: 1000px;--header-h: 60px}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;font-family:var(--font);line-height:1.7;color:var(--text);background:radial-gradient(1000px 400px at 85% -10%,rgba(37,99,235,.06),transparent 60%),var(--bg);-webkit-font-smoothing:antialiased}img,svg{vertical-align:middle}a{color:var(--accent);text-decoration:none}a:hover{color:var(--accent-strong);text-decoration:underline}h1,h2,h3,h4{line-height:1.3;margin:0 0 .6em;font-weight:700}h1{font-size:1.8rem}h2{font-size:1.35rem}h3{font-size:1.12rem}p{margin:0 0 1em}code{font-family:var(--mono);font-size:.92em}.container{max-width:var(--container);margin:0 auto;padding:0 20px}.skip-link{position:absolute;left:-999px;top:0;z-index:100;background:var(--accent);color:#fff;padding:8px 16px;border-radius:0 0 8px}.skip-link:focus{left:0}.site-header{position:sticky;top:0;z-index:50;background:#ffffffd9;backdrop-filter:blur(10px);-webkit-backdrop-filter:blur(10px);border-bottom:1px solid var(--border);height:var(--header-h);display:flex;align-items:center}.header-inner{display:flex;align-items:center;justify-content:space-between;width:100%}.brand{display:inline-flex;align-items:center;gap:10px;color:var(--text);font-weight:700;font-size:1.02rem}.brand:hover{color:var(--text);text-decoration:none}.brand-mark{display:inline-flex;align-items:center;justify-content:center;width:32px;height:32px;border-radius:9px;background:linear-gradient(135deg,#3b82f6,#2563eb);color:#fff;box-shadow:0 2px 6px #2563eb59}.site-nav{display:flex;gap:4px}.site-nav a{padding:7px 13px;border-radius:var(--radius-sm);color:var(--text-muted);font-size:.94rem;font-weight:500;transition:color .15s,background .15s}.site-nav a:hover{color:var(--accent);background:var(--accent-soft);text-decoration:none}main{min-height:calc(100vh - var(--header-h) - 120px);padding:2.2rem 0 3.5rem}.site-footer{border-top:1px solid var(--border);background:var(--surface)}.footer-inner{display:flex;align-items:center;justify-content:space-between;gap:12px;flex-wrap:wrap;padding-top:1.4rem;padding-bottom:1.4rem;font-size:.88rem;color:var(--text-muted)}.footer-inner p{margin:0}.footer-inner nav{display:flex;gap:16px}.page-title{margin-bottom:.35rem}.page-lead{color:var(--text-muted);margin-bottom:1.8rem;font-size:1.02rem}.muted{color:var(--text-muted)}.card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow)}.tag{display:inline-block;padding:2px 10px;border-radius:999px;background:var(--accent-soft);color:var(--accent-strong);font-size:.78rem;font-weight:500}.btn{display:inline-flex;align-items:center;gap:6px;padding:.55rem 1.15rem;border-radius:var(--radius-sm);background:var(--accent);color:#fff;font-weight:600;font-size:.95rem;border:none;cursor:pointer;transition:background .15s,transform .05s;text-decoration:none}.btn:hover{background:var(--accent-strong);color:#fff;text-decoration:none}.btn:active{transform:translateY(1px)}.btn.ghost{background:var(--surface);color:var(--text);border:1px solid var(--border)}.btn.ghost:hover{background:var(--surface-2);color:var(--text)}input[type=search],input[type=text],select{padding:.5rem .75rem;border:1px solid var(--border);border-radius:var(--radius-sm);font:inherit;font-size:.94rem;color:var(--text);background:var(--surface);transition:border-color .15s,box-shadow .15s}input[type=search]:focus,input[type=text]:focus,select:focus{outline:none;border-color:var(--accent);box-shadow:0 0 0 3px #2563eb24}.prose{color:var(--text)}.prose h2{margin-top:1.8rem;padding-bottom:.3rem;border-bottom:1px solid var(--border)}.prose ul,.prose ol{padding-left:1.4rem}.prose li{margin:.3rem 0}.prose blockquote{margin:1rem 0;padding:.6rem 1rem;border-left:3px solid var(--accent);background:var(--accent-soft);border-radius:0 var(--radius-sm) var(--radius-sm) 0;color:var(--text-muted)}.prose code{background:var(--surface-2);padding:.1em .4em;border-radius:4px}pre{background:#0f172a;color:#e2e8f0;border-radius:var(--radius);padding:1rem 1.2rem;overflow-x:auto;font-family:var(--mono);font-size:.86rem;line-height:1.6}pre code{background:none;padding:0;color:inherit}@media(max-width:640px){:root{--header-h: 54px}h1{font-size:1.5rem}main{padding-top:1.6rem}.site-nav a{padding:6px 9px;font-size:.88rem}.brand-name{font-size:.95rem}}