:root{--color-bg: #ffffff;--color-bg-soft: #f7f8fa;--color-bg-code: #f4f4f5;--color-border: #e4e6eb;--color-text: #1f2329;--color-text-soft: #646a73;--color-text-muted: #8a8f99;--color-primary: #2b6cff;--color-primary-hover: #1a57f0;--color-success: #1aaa55;--color-warning: #f5a623;--color-error: #e5484d;--font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;--font-mono: "SFMono-Regular", "JetBrains Mono", Menlo, Consolas, "Liberation Mono", monospace;--radius-sm: 6px;--radius-md: 10px;--radius-lg: 14px;--shadow-sm: 0 1px 2px rgba(20, 25, 35, .06);--shadow-md: 0 4px 12px rgba(20, 25, 35, .08)}@media(prefers-color-scheme:dark){:root{--color-bg: #0f1115;--color-bg-soft: #161a21;--color-bg-code: #1a1f28;--color-border: #262c36;--color-text: #e6e8eb;--color-text-soft: #a8aeb8;--color-text-muted: #6b7280;--color-primary: #5b8cff;--color-primary-hover: #7aa1ff;--shadow-sm: 0 1px 2px rgba(0, 0, 0, .3);--shadow-md: 0 4px 12px rgba(0, 0, 0, .4)}}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;padding:0;font-family:var(--font-sans);font-size:16px;line-height:1.65;color:var(--color-text);background:var(--color-bg);-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}a{color:var(--color-primary);text-decoration:none;transition:color .15s ease}a:hover{color:var(--color-primary-hover)}img{max-width:100%;height:auto}button{font-family:inherit;cursor:pointer}.container{width:100%;max-width:1200px;margin:0 auto;padding:0 20px}.site-header{border-bottom:1px solid var(--color-border);background:var(--color-bg);position:sticky;top:0;z-index:50;backdrop-filter:saturate(180%) blur(8px)}.site-header__inner{display:flex;align-items:center;justify-content:space-between;height:56px}.site-header__brand{display:inline-flex;align-items:center;gap:8px;font-weight:600;font-size:17px;color:var(--color-text)}.site-header__brand:hover{color:var(--color-primary)}.site-header__brand-mark{display:inline-flex;align-items:center;justify-content:center;width:28px;height:28px;border-radius:var(--radius-sm);background:linear-gradient(135deg,var(--color-primary),#7a4cff);color:#fff;font-size:14px;font-weight:700}.site-header__nav{display:flex;align-items:center;gap:4px}.site-header__nav a{padding:6px 12px;border-radius:var(--radius-sm);color:var(--color-text-soft);font-size:14px;transition:all .15s ease}.site-header__nav a:hover{color:var(--color-text);background:var(--color-bg-soft)}.site-footer{border-top:1px solid var(--color-border);background:var(--color-bg-soft);padding:32px 0;margin-top:64px;color:var(--color-text-soft);font-size:14px}.site-footer__inner{display:flex;flex-wrap:wrap;gap:16px;justify-content:space-between;align-items:center}.site-footer a{color:var(--color-text-soft)}.site-footer a:hover{color:var(--color-primary)}.page-hero{padding:48px 0 24px;text-align:center}.page-hero h1{font-size:32px;margin:0 0 12px;letter-spacing:-.02em;font-weight:700}.page-hero p{margin:0 auto;max-width:640px;color:var(--color-text-soft);font-size:16px}@media(max-width:768px){.page-hero{padding:32px 0 16px}.page-hero h1{font-size:26px}}.btn{display:inline-flex;align-items:center;justify-content:center;gap:6px;padding:8px 16px;border:1px solid var(--color-border);border-radius:var(--radius-sm);background:var(--color-bg);color:var(--color-text);font-size:14px;font-weight:500;transition:all .15s ease;white-space:nowrap}.btn:hover{border-color:var(--color-primary);color:var(--color-primary)}.btn--primary{background:var(--color-primary);color:#fff;border-color:var(--color-primary)}.btn--primary:hover{background:var(--color-primary-hover);border-color:var(--color-primary-hover);color:#fff}.btn--sm{padding:5px 10px;font-size:13px}.btn:disabled{opacity:.5;cursor:not-allowed}.prose{max-width:720px;margin:0 auto;padding:32px 0}.prose h1{font-size:28px;margin:0 0 16px;font-weight:700}.prose h2{font-size:20px;margin:28px 0 12px;font-weight:600}.prose p{margin:0 0 14px;color:var(--color-text);line-height:1.75}.prose ul,.prose ol{padding-left:22px;margin:0 0 14px}.prose li{margin-bottom:6px;line-height:1.7}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}:focus-visible{outline:2px solid var(--color-primary);outline-offset:2px;border-radius:4px}.skip-link{position:absolute;top:-40px;left:8px;z-index:100;padding:8px 12px;background:var(--color-primary);color:#fff;border-radius:var(--radius-sm);font-size:14px}.skip-link:focus{top:8px;color:#fff}