:root{--bg-primary: #fafafa;--bg-secondary: #fff;--bg-card: #fff;--text-primary: #1a1a1a;--text-secondary: #888;--accent: #1a1a1a;--accent-hover: #333;--correct: #16a34a;--wrong: #dc2626;--border: #e5e5e5;--surface: #f5f5f5;--radius: 8px;--radius-sm: 6px;--shadow: 0 1px 3px rgba(0, 0, 0, .06);--shadow-hover: 0 4px 12px rgba(0, 0, 0, .08);--transition: .2s ease;--font-heading: "Space Grotesk", sans-serif;--font-body: "Space Grotesk", sans-serif;--correct-bg: #f0fdf4;--wrong-bg: #fef2f2;--header-bg: rgba(255, 255, 255, .9);--shadow-menu: 0 4px 16px rgba(0, 0, 0, .1);--accent-contrast: #fff}[data-theme=dark]{--bg-primary: #111;--bg-secondary: #1a1a1a;--bg-card: #1a1a1a;--text-primary: #e5e5e5;--text-secondary: #888;--accent: #e5e5e5;--accent-hover: #ccc;--correct: #4ade80;--wrong: #f87171;--border: #2a2a2a;--surface: #1f1f1f;--shadow: 0 1px 3px rgba(0, 0, 0, .3);--shadow-hover: 0 4px 12px rgba(0, 0, 0, .4);--correct-bg: rgba(74, 222, 128, .1);--wrong-bg: rgba(248, 113, 113, .1);--header-bg: rgba(17, 17, 17, .9);--shadow-menu: 0 4px 16px rgba(0, 0, 0, .4);--accent-contrast: #111}*,*:before,*:after{margin:0;padding:0;box-sizing:border-box}html{scroll-behavior:smooth}body{font-family:var(--font-body);background:var(--bg-primary);color:var(--text-primary);min-height:100vh;line-height:1.6}#root{min-height:100vh;display:flex;flex-direction:column}a{color:var(--text-primary);text-decoration:none;transition:color var(--transition)}a:hover{color:var(--text-secondary)}button{cursor:pointer;font-family:var(--font-body)}.container{width:100%;max-width:900px;margin:0 auto;padding:0 1.25rem}.page{flex:1;padding:2rem 0 4rem;animation:fadeInUp .4s ease}.card{background:var(--bg-card);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow);transition:all var(--transition)}.card:hover{box-shadow:var(--shadow-hover)}.btn{display:inline-flex;align-items:center;justify-content:center;gap:.5rem;padding:.65rem 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