:root,[data-theme=dark]{--bg-primary: #000000;--bg-secondary: #0a0a0a;--bg-card: #121212;--bg-card-hover: #1a1a1a;--bg-elevated: #242424;--border-color: #262626;--border-highlight: #404040;--text-main: #f4f4f5;--text-muted: #a1a1aa;--text-dim: #71717a;--accent-primary: #e4e4e7;--accent-primary-hover: #ffffff;--accent-btn-bg: linear-gradient(180deg, #2e2e33 0%, #1f1f23 100%);--accent-btn-text: #ffffff;--accent-btn-border: #3f3f46;--easy-color: #34d399;--easy-bg: rgba(52, 211, 153, .1);--easy-border: rgba(52, 211, 153, .25);--medium-color: #fbbf24;--medium-bg: rgba(251, 191, 36, .1);--medium-border: rgba(251, 191, 36, .25);--hard-color: #f87171;--hard-bg: rgba(248, 113, 113, .1);--hard-border: rgba(248, 113, 113, .25);--radius-sm: 6px;--radius-md: 10px;--radius-lg: 14px;--radius-full: 9999px;--shadow-sm: none;--shadow-md: 0 4px 20px rgba(0, 0, 0, .4);--font-sans: "Plus Jakarta Sans", -apple-system, BlinkMacSystemFont, sans-serif;--font-mono: "JetBrains Mono", monospace}[data-theme=cream]{--bg-primary: #faf7f2;--bg-secondary: #f2ece1;--bg-card: #ffffff;--bg-card-hover: #fcfbf9;--bg-elevated: #e8e2d5;--border-color: #e5dec9;--border-highlight: #d4caa8;--text-main: #1c1917;--text-muted: #78716c;--text-dim: #a8a29e;--accent-primary: #1c1917;--accent-primary-hover: #000000;--accent-btn-bg: linear-gradient(180deg, #383330 0%, #211e1c 100%);--accent-btn-text: #faf7f2;--accent-btn-border: #44403c;--easy-color: #059669;--easy-bg: rgba(5, 150, 105, .08);--easy-border: rgba(5, 150, 105, .2);--medium-color: #d97706;--medium-bg: rgba(217, 119, 6, .08);--medium-border: rgba(217, 119, 6, .2);--hard-color: #dc2626;--hard-bg: rgba(220, 38, 38, .08);--hard-border: rgba(220, 38, 38, .2);--shadow-sm: 0 1px 3px rgba(0, 0, 0, .04);--shadow-md: 0 4px 12px rgba(0, 0, 0, .05)}*{box-sizing:border-box;margin:0;padding:0}body{background-color:var(--bg-primary);color:var(--text-main);font-family:var(--font-sans);min-height:100vh;line-height:1.5;-webkit-font-smoothing:antialiased;overflow-x:hidden;transition:background-color .25s ease,color .25s ease}::-webkit-scrollbar{width:7px;height:7px}::-webkit-scrollbar-track{background:var(--bg-primary)}::-webkit-scrollbar-thumb{background:var(--border-color);border-radius:4px}::-webkit-scrollbar-thumb:hover{background:var(--text-dim)}.app-container{max-width:1400px;margin:0 auto;padding:0 1.5rem 3rem}.glass-card{background:var(--bg-card);border:1px solid var(--border-color);border-radius:var(--radius-md);box-shadow:var(--shadow-sm);transition:border-color .2s ease,background .2s ease,transform .2s ease}.glass-card:hover{border-color:var(--border-highlight)}.badge{display:inline-flex;align-items:center;gap:.35rem;padding:.2rem .6rem;border-radius:var(--radius-full);font-size:.725rem;font-weight:600;letter-spacing:.01em}.badge-easy{color:var(--easy-color);background:var(--easy-bg);border:1px solid var(--easy-border)}.badge-medium{color:var(--medium-color);background:var(--medium-bg);border:1px solid var(--medium-border)}.badge-hard{color:var(--hard-color);background:var(--hard-bg);border:1px solid var(--hard-border)}.badge-neutral{color:var(--text-muted);background:var(--bg-secondary);border:1px solid var(--border-color)}.badge-accent{color:var(--text-main);background:var(--bg-elevated);border:1px solid var(--border-color)}.input-search{width:100%;background:var(--bg-card);border:1px solid var(--border-color);border-radius:var(--radius-sm);padding:.7rem 1rem .7rem 2.6rem;color:var(--text-main);font-size:.9rem;outline:none;transition:border-color .2s ease,box-shadow .2s ease}.input-search:focus{border-color:var(--text-main);box-shadow:0 0 0 2px #ffffff1a}select option{background-color:var(--bg-card);color:var(--text-main)}.btn{display:inline-flex;align-items:center;justify-content:center;gap:.45rem;padding:.55rem 1.1rem;border-radius:var(--radius-sm);font-size:.85rem;font-weight:600;cursor:pointer;border:1px solid var(--border-color);transition:all .15s cubic-bezier(.4,0,.2,1);-webkit-user-select:none;user-select:none;text-decoration:none;position:relative;overflow:hidden}.btn:active{transform:scale(.98)}.btn-primary{background:var(--accent-btn-bg);color:var(--accent-btn-text);border-color:var(--accent-btn-border);box-shadow:inset 0 1px #ffffff1f,0 2px 4px #0003}.btn-primary:hover{filter:brightness(1.15);transform:translateY(-1px);box-shadow:inset 0 1px #ffffff2e,0 4px 8px #00000040}.btn-secondary{background:linear-gradient(180deg,var(--bg-card) 0%,var(--bg-secondary) 100%);color:var(--text-main);box-shadow:inset 0 1px #ffffff0d}.btn-secondary:hover{background:var(--bg-secondary);border-color:var(--border-highlight);transform:translateY(-1px)}@keyframes fadeIn{0%{opacity:0;transform:translateY(4px)}to{opacity:1;transform:translateY(0)}}.animate-fade-in{animation:fadeIn .2s ease-out forwards}