:root{--font-sans:-apple-system, BlinkMacSystemFont, "SF Pro Text", "SF Pro Icons", "Helvetica Neue", "Helvetica", "Arial", "Hiragino Sans", "Hiragino Kaku Gothic ProN", "Meiryo", sans-serif;--header-height:72px;--max-width:1080px;--radius-sm:8px;--radius-md:14px;--radius-lg:20px;--radius-xl:32px;--transition-smooth:.4s cubic-bezier(.16, 1, .3, 1);--transition-fast:.2s ease;--shadow-subtle:0 4px 12px #0000000a;--shadow-medium:0 12px 32px #00000014;--shadow-luxury:0 20px 48px #0000001f}*{box-sizing:border-box;-webkit-tap-highlight-color:transparent;margin:0;padding:0}:root,[data-theme=light]{--bg-primary:#fff;--bg-secondary:#fbfbfd;--bg-tertiary:#f5f5f7;--text-primary:#1d1d1f;--text-secondary:#424245;--text-muted:#86868b;--accent-primary:#0071e3;--accent-secondary:#0071e31a;--border-color:#d2d2d7;--border-subtle:#e8e8ed;--header-bg:#ffffffd9;--card-bg:#fff;--overlay-bg:#0006}[data-theme=dark]{--bg-primary:#000;--bg-secondary:#000;--bg-tertiary:#1c1c1e;--text-primary:#f5f5f7;--text-secondary:#a1a1a6;--text-muted:#6e6e73;--accent-primary:#0a84ff;--accent-secondary:#0a84ff26;--border-color:#333336;--border-subtle:#262629;--header-bg:#000000d9;--card-bg:#1c1c1e;--overlay-bg:#000000b3}html{scroll-behavior:smooth}body{font-family:var(--font-sans);background:var(--bg-secondary);color:var(--text-primary);-webkit-font-smoothing:antialiased;letter-spacing:-.012em;transition:background-color var(--transition-smooth), color 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