*,*:before,*:after{margin:0;padding:0;box-sizing:border-box}:root{--primary-50: #eff6ff;--primary-100: #dbeafe;--primary-200: #bfdbfe;--primary-300: #93c5fd;--primary-400: #60a5fa;--primary-500: #3b82f6;--primary-600: #2563eb;--primary-700: #1d4ed8;--primary-800: #1e40af;--primary-900: #1e3a8a;--secondary-50: #f0fdf4;--secondary-100: #dcfce7;--secondary-200: #bbf7d0;--secondary-400: #4ade80;--secondary-500: #22c55e;--secondary-600: #16a34a;--accent-50: #fff7ed;--accent-100: #ffedd5;--accent-400: #fb923c;--accent-500: #f97316;--accent-600: #ea580c;--success-500: #22c55e;--success-600: #16a34a;--warning-500: #eab308;--warning-600: #ca8a04;--error-500: #ef4444;--error-600: #dc2626;--neutral-50: #f8fafc;--neutral-100: #f1f5f9;--neutral-200: #e2e8f0;--neutral-300: #cbd5e1;--neutral-400: #94a3b8;--neutral-500: #64748b;--neutral-600: #475569;--neutral-700: #334155;--neutral-800: #1e293b;--neutral-900: #0f172a;--white: #ffffff;--shadow-sm: 0 1px 2px rgba(0, 0, 0, .05);--shadow-md: 0 4px 6px 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p{font-size:.8125rem;color:var(--neutral-500);margin-top:2px}.topic-link{display:inline-flex;align-items:center;gap:6px;margin-top:6px;font-size:.8125rem;font-weight:600;color:#dc2626;text-decoration:none;transition:opacity var(--transition)}.topic-link:hover{opacity:.75}.tool-card{background:var(--white);border:1px solid var(--neutral-200);border-radius:var(--radius-lg);overflow:hidden;transition:transform var(--transition),box-shadow var(--transition)}.tool-card:hover{transform:translateY(-4px);box-shadow:var(--shadow-lg)}.tool-card-header{padding:24px;color:var(--white)}.tool-card-header.blue-bg{background:linear-gradient(135deg,var(--primary-600),var(--primary-400))}.tool-card-header.green-bg{background:linear-gradient(135deg,var(--secondary-600),var(--secondary-400))}.tool-card-header.orange-bg{background:linear-gradient(135deg,var(--accent-600),var(--accent-400))}.tool-card-header h3{font-size:1.25rem;font-weight:600;margin-bottom:4px}.tool-card-header 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p{font-size:.9375rem;color:var(--neutral-600);text-align:center}.flashcard-hint{font-size:.8125rem;color:var(--neutral-400);margin-top:16px}.flashcard-nav{display:flex;gap:12px;justify-content:center;align-items:center;margin-top:24px}.flashcard-counter{font-size:.875rem;color:var(--neutral-500);font-weight:500}.quiz-subject-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(200px,1fr));gap:16px;max-width:720px;margin:0 auto}.quiz-subject-btn{display:flex;flex-direction:column;align-items:center;gap:8px;padding:28px 16px;background:var(--white);border:2px solid var(--neutral-200);border-radius:var(--radius-lg);cursor:pointer;transition:all 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h3{font-size:1rem;font-weight:600;color:var(--neutral-900);margin-bottom:8px}.discussion-card>p{font-size:.875rem;color:var(--neutral-500);line-height:1.6;margin-bottom:12px}.discussion-stats{display:flex;gap:16px}.discussion-stat{display:flex;align-items:center;gap:4px;font-size:.8125rem;color:var(--neutral-400)}.discussion-stat svg{width:14px;height:14px}.stats-bar{background:linear-gradient(135deg,var(--primary-800),var(--primary-600));color:var(--white);padding:48px 24px}.stats-grid{max-width:1200px;margin:0 auto;display:grid;grid-template-columns:repeat(auto-fit,minmax(160px,1fr));gap:32px;text-align:center}.stat-item h3{font-size:clamp(1.75rem,3.5vw,2.5rem);font-weight:700;margin-bottom:4px}.stat-item p{opacity:.8;font-size:.9375rem}.about-content{display:grid;grid-template-columns:1fr 1fr;gap:48px;align-items:center}.about-text h3{font-size:1.5rem;font-weight:700;color:var(--neutral-900);margin-bottom:16px}.about-text 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p{color:var(--neutral-500);font-size:.875rem;line-height:1.6}.founder-card{display:flex;align-items:center;gap:32px;max-width:720px;margin:0 auto;background:var(--white);border:1px solid var(--neutral-200);border-radius:var(--radius-lg);padding:40px;transition:box-shadow var(--transition)}.founder-card:hover{box-shadow:var(--shadow-lg)}.founder-avatar{flex-shrink:0;width:96px;height:96px;border-radius:50%;background:linear-gradient(135deg,var(--primary-600),var(--primary-400));display:flex;align-items:center;justify-content:center}.founder-avatar span{font-size:2rem;font-weight:700;color:var(--white);letter-spacing:-.02em}.founder-info h3{font-size:1.375rem;font-weight:700;color:var(--neutral-900);margin-bottom:4px}.founder-role{font-size:.9375rem;font-weight:600;color:var(--primary-600);margin-bottom:12px}.founder-bio{font-size:.9375rem;color:var(--neutral-600);line-height:1.7}@media (max-width: 600px){.founder-card{flex-direction:column;text-align:center;padding:32px 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