@import "https://fonts.googleapis.com/css2?family=Inter:wght@300;400;500;600;700;800&family=Outfit:wght@400;500;600;700;800&display=swap";:root,[data-theme=dark]{--bg-dark:#090d16;--bg-card:#111827bf;--bg-card-hover:#1f2937d9;--bg-input:#111827;--border-color:#ffffff1a;--border-focus:#6366f1;--primary-rgb:99, 102, 241;--primary:#6366f1;--primary-hover:#4f46e5;--accent:#06b6d4;--accent-gradient:linear-gradient(135deg, #6366f1 0%, #06b6d4 100%);--success:#10b981;--warning:#f59e0b;--danger:#ef4444;--info:#3b82f6;--text-primary:#f9fafb;--text-secondary:#9ca3af;--text-muted:#6b7280;--font-heading:"Outfit", sans-serif;--font-body:"Inter", sans-serif;--radius-sm:8px;--radius-md:12px;--radius-lg:18px;--radius-full:9999px;--shadow-glow:0 0 25px #6366f140;--shadow-card:0 10px 30px -10px #00000080;--glass-nav-bg:#090d16d9;--bg-radial-1:#6366f11f;--bg-radial-2:#06b6d41a}[data-theme=light]{--bg-dark:#f8fafc;--bg-card:#ffffffd9;--bg-card-hover:#f1f5f9f2;--bg-input:#fff;--border-color:#0000001f;--border-focus:#4f46e5;--primary:#4f46e5;--primary-hover:#4338ca;--accent:#0284c7;--accent-gradient:linear-gradient(135deg, #4f46e5 0%, #0284c7 100%);--text-primary:#0f172a;--text-secondary:#475569;--text-muted:#94a3b8;--shadow-glow:0 0 25px #4f46e526;--shadow-card:0 10px 30px -10px #00000014;--glass-nav-bg:#ffffffd9;--bg-radial-1:#4f46e514;--bg-radial-2:#0284c70f}*{box-sizing:border-box;margin:0;padding:0}body{font-family:var(--font-body);background-color:var(--bg-dark);color:var(--text-primary);background-image:radial-gradient(circle at 15% 15%, var(--bg-radial-1) 0%, transparent 40%), radial-gradient(circle at 85% 85%, var(--bg-radial-2) 0%, transparent 40%);background-attachment:fixed;min-height:100vh;line-height:1.5;transition:background-color .3s,color .3s;overflow-x:hidden}h1,h2,h3,h4,h5,h6{font-family:var(--font-heading);color:var(--text-primary);letter-spacing:-.02em;font-weight:700}.glass-card{background:var(--bg-card);-webkit-backdrop-filter:blur(16px);border:1px solid var(--border-color);border-radius:var(--radius-md);box-shadow:var(--shadow-card);transition:transform .2s,border-color .2s,box-shadow .2s,background-color .3s}.glass-card:hover{border-color:#6366f14d}.glass-card-interactive:hover{box-shadow:var(--shadow-glow);border-color:#6366f180;transform:translateY(-3px)}.glass-nav{background:var(--glass-nav-bg);-webkit-backdrop-filter:blur(20px);border-bottom:1px solid var(--border-color);z-index:100;transition:background-color .3s;position:sticky;top:0}.btn{border-radius:var(--radius-sm);cursor:pointer;-webkit-user-select:none;user-select:none;border:none;justify-content:center;align-items:center;gap:.5rem;padding:.625rem 1.25rem;font-size:.925rem;font-weight:600;text-decoration:none;transition:all .2s cubic-bezier(.4,0,.2,1);display:inline-flex}.btn-primary{background:var(--accent-gradient);color:#fff;box-shadow:0 4px 15px #6366f159}.btn-primary:hover{opacity:.95;transform:translateY(-1px);box-shadow:0 6px 20px #6366f173}.btn-secondary{background:var(--border-color);color:var(--text-primary);border:1px solid var(--border-color)}.btn-secondary:hover{background:#7d7d7d2e}.btn-outline-primary{color:var(--primary);border:1px solid var(--primary);background:0 0}.btn-outline-primary:hover{background:#6366f126}.btn-success{background:var(--success);color:#fff}.btn-danger{background:var(--danger);color:#fff}.btn-sm{padding:.375rem .75rem;font-size:.825rem}.btn-lg{padding:.875rem 1.75rem;font-size:1.05rem}.badge{text-transform:uppercase;letter-spacing:.04em;border-radius:var(--radius-full);align-items:center;gap:.35rem;padding:.25rem .65rem;font-size:.75rem;font-weight:700;display:inline-flex}.badge-easy{color:#10b981;background:#10b98126;border:1px solid #10b9814d}.badge-medium{color:#d97706;background:#f59e0b26;border:1px solid #f59e0b4d}.badge-hard{color:#dc2626;background:#ef444426;border:1px solid #ef44444d}.badge-ai{color:#0284c7;background:#06b6d426;border:1px solid #06b6d44d}.badge-teacher{color:#9333ea;background:#a855f726;border:1px solid #a855f74d}.form-input,.form-select,.form-textarea{background:var(--bg-input);border:1px solid var(--border-color);border-radius:var(--radius-sm);width:100%;color:var(--text-primary);font-size:.95rem;font-family:var(--font-body);outline:none;padding:.65rem 1rem;transition:border-color .2s,background-color .3s}.form-input:focus,.form-select:focus,.form-textarea:focus{border-color:var(--primary);box-shadow:0 0 0 3px #6366f133}.grid-cols-auto{grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:1.25rem;display:grid}.grid-cols-4{grid-template-columns:repeat(4,1fr);gap:1.25rem;display:grid}@media (width<=1024px){.grid-cols-4{grid-template-columns:repeat(2,1fr)}}@media (width<=640px){.grid-cols-4{grid-template-columns:1fr}}.palette-btn{border-radius:var(--radius-sm);cursor:pointer;border:1px solid var(--border-color);justify-content:center;align-items:center;width:38px;height:38px;font-size:.875rem;font-weight:700;transition:all .15s;display:flex}.palette-btn.not-visited{background:var(--border-color);color:var(--text-secondary)}.palette-btn.answered{color:#fff;background:#059669;border-color:#10b981}.palette-btn.not-answered{color:#fff;background:#dc2626;border-color:#ef4444}.palette-btn.marked-review{color:#fff;background:#7c3aed;border-color:#8b5cf6}.palette-btn.active{ring:3px #6366f1;transform:scale(1.1);box-shadow:0 0 10px #6366f199}::-webkit-scrollbar{width:8px;height:8px}::-webkit-scrollbar-track{background:var(--bg-dark)}::-webkit-scrollbar-thumb{background:var(--border-color);border-radius:4px}.text-gradient{background:var(--accent-gradient);-webkit-text-fill-color:transparent;-webkit-background-clip:text}