:root{--color-bg: #f5f5f7;--color-surface: #ffffff;--color-text: #1d1d1f;--color-text-muted: #6e6e73;--color-border: #e5e5ea;--color-accent: #0071e3;--color-accent-soft: #e0eefc;--color-success: #34c759;--color-warning: #ff9500;--color-danger: #ff3b30;--color-bg-dark: #000000;--color-surface-dark: #1d1d1f;--color-text-dark: #f5f5f7;--color-text-muted-dark: #86868b;--color-border-dark: #333333;--color-accent-dark: #2997ff;--color-accent-soft-dark: #1f2f3f;--font-sans: -apple-system, BlinkMacSystemFont, "SF Pro Text", "SF Pro Display", "Helvetica Neue", Arial, "Microsoft YaHei", sans-serif;--font-mono: "SF Mono", ui-monospace, Menlo, Consolas, monospace;--space-1: 8px;--space-2: 16px;--space-3: 24px;--space-4: 32px;--space-6: 48px;--space-8: 64px;--radius-sm: 6px;--radius-md: 12px;--radius-lg: 18px;--radius-full: 999px;--shadow-sm: 0 1px 2px rgb(0 0 0 / .05);--shadow-md: 0 4px 16px rgb(0 0 0 / .08);--shadow-lg: 0 12px 40px rgb(0 0 0 / .12);--motion-fast: .15s;--motion-base: 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.6)}}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--color-bg);color:var(--color-text);font-size:15px;line-height:1.5;-webkit-font-smoothing:antialiased}a{color:inherit;text-decoration:none}button,input{font:inherit;color:inherit}button{-webkit-tap-highlight-color:transparent}code{font-family:var(--font-mono)}:focus-visible{outline:2px solid var(--color-accent);outline-offset:2px}.nav{position:sticky;top:0;z-index:20;background:#f5f5f7c7;-webkit-backdrop-filter:blur(20px) saturate(180%);backdrop-filter:blur(20px) saturate(180%);border-bottom:1px solid var(--color-border)}@media (prefers-color-scheme: dark){.nav{background:#000000b8}}.nav-inner{max-width:1120px;margin:0 auto;padding:12px 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