:root{--bg:#181818;--bg-secondary:#202020;--surface:#252525;--surface-hover:#2d2d2d;--surface-light:#333;--border:#3a3a3a;--border-hover:#f59e0b;--primary:#f59e0b;--primary-dark:#ea8c00;--primary-light:#ffb84d;--primary-gradient:linear-gradient(135deg, #f59e0b, #ff6b00);--success:#22c55e;--danger:#ef4444;--warning:#facc15;--info:#3b82f6;--text:#f5f5f5;--text-secondary:#9ca3af;--text-muted:#737373;--space-xs:4px;--space-sm:8px;--space-md:16px;--space-lg:24px;--space-xl:32px;--space-2xl:48px;--space-3xl:72px;--space-4xl:96px;--radius-sm:8px;--radius-md:14px;--radius-lg:22px;--radius-xl:32px;--radius-pill:999px;--shadow-sm:0 4px 10px #0003;--shadow-md:0 12px 30px #0000004d;--shadow-lg:0 25px 60px #0006;--transition-fast:.2s ease;--transition:.3s ease;--transition-slow:.45s 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p{color:var(--text-secondary);font-size:1.1rem;line-height:1.8}.features-grid{grid-template-columns:repeat(3,1fr);gap:28px;display:grid}.feature-card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius-lg);transition:var(--transition);padding:36px}.feature-card:hover{border-color:var(--primary);box-shadow:var(--shadow-lg);transform:translateY(-6px)}.feature-card span{background:#ffa1161f;border-radius:18px;justify-content:center;align-items:center;width:64px;height:64px;margin-bottom:24px;font-size:2rem;display:inline-flex}.feature-card h3{color:var(--text);margin-bottom:16px;font-size:1.55rem}.feature-card p{color:var(--text-secondary);line-height:1.8}@media (width<=992px){.features-grid{grid-template-columns:repeat(2,1fr)}}@media (width<=768px){.features{margin:70px auto}.section-heading{margin-bottom:40px}.section-heading h2{font-size:2.2rem}.section-heading p{font-size:1rem}.features-grid{grid-template-columns:1fr;gap:20px}.feature-card{padding:28px}.feature-card span{width:56px;height:56px;margin-bottom:18px;font-size:1.7rem}.feature-card h3{font-size:1.35rem}}@media (width<=480px){.features{width:94%}.feature-card{padding:24px}}.stats{grid-template-columns:repeat(4,1fr);gap:24px;width:min(1200px,90%);margin:80px auto;display:grid}.stat-card{background:var(--surface);border:1px solid var(--border);text-align:center;border-radius:20px;padding:35px}.stat-card h2{color:var(--primary);margin-bottom:10px;font-size:3rem}.stat-card p{color:var(--text-secondary)}.pattern{grid-template-columns:1.2fr .8fr;align-items:center;gap:60px;width:min(1200px,90%);margin:100px auto;display:grid}.pattern h2{margin:25px 0;font-size:3.2rem;line-height:1.15}.pattern p{color:var(--text-secondary);margin-bottom:30px;line-height:1.8}.pattern ul{flex-direction:column;gap:18px;list-style:none;display:flex}.brain-card{background:var(--surface);border:1px solid 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h2{font-size:3rem}.result-grid{grid-template-columns:1fr}}.history-wrapper{width:min(1100px,92%);margin:0 auto}.history-header{text-align:center;margin-bottom:50px}.history-header p{color:var(--text-secondary);margin-top:14px}.history-grid{grid-template-columns:repeat(auto-fit,minmax(320px,1fr));gap:24px;display:grid}.history-card{flex-direction:column;gap:28px;display:flex}.history-top{justify-content:space-between;align-items:center;display:flex}.history-top h2{font-size:1.4rem}.history-top span{color:var(--text-secondary);font-weight:600}.history-stats{grid-template-columns:repeat(2,1fr);gap:18px;display:grid}.history-stats div{border:1px solid var(--border);border-radius:var(--radius-md);background:#ffffff08;padding:18px}.history-stats small{color:var(--text-secondary);margin-bottom:8px;display:block}.history-stats strong{font-size:1.4rem}.history-empty{text-align:center;max-width:500px;margin:80px auto}.history-empty p{color:var(--text-secondary);margin-top:12px}@media (width<=768px){.history-grid{grid-template-columns:1fr}}.profile-page{flex-direction:column;gap:32px;width:min(1100px,92%);margin:50px auto;display:flex}.profile-card{background:var(--surface);border:1px solid var(--border);border-radius:24px;padding:40px}.profile-avatar{background:#2f2f2f;border-radius:50%;justify-content:center;align-items:center;width:90px;height:90px;margin:auto auto 20px;font-size:42px;display:flex}.profile-card h1{text-align:center;margin-bottom:12px;font-size:2.3rem}.profile-badge{width:max-content;color:var(--primary);background:#ffa11626;border-radius:999px;margin:auto;padding:10px 18px;font-weight:600;display:block}.profile-card h2{margin-bottom:30px}.profile-grid{grid-template-columns:repeat(3,1fr);gap:22px;display:grid}.stat-box{border:1px solid var(--border);background:#2d2d2d;border-radius:18px;padding:24px}.stat-box span{color:var(--text-secondary)}.stat-box h3{color:var(--primary);margin-top:10px;font-size:2rem}.coming-soon{color:var(--text-secondary);font-size:1.05rem;line-height:1.8}@media (width<=768px){.profile-card{padding:28px}.profile-grid{grid-template-columns:1fr}.profile-card h1{font-size:2rem}}.review-wrapper{width:min(900px,92%);margin:0 auto}.review-header{text-align:center;margin-bottom:50px}.review-header p{color:var(--text-secondary);margin-top:14px}.review-card{flex-direction:column;gap:22px;margin-bottom:28px;display:flex}.review-card.correct{border-left:6px solid var(--success)}.review-card.wrong{border-left:6px solid var(--danger)}.question-number{color:var(--primary);background:#ffa1161f;border-radius:999px;margin-bottom:18px;padding:8px 16px;font-size:.85rem;font-weight:600;display:inline-block}.review-question h2{font-size:1.35rem;line-height:1.6}.review-section{border:1px solid var(--border);border-radius:var(--radius-md);background:#ffffff08;padding:20px}.review-section small{color:var(--text-secondary);margin-bottom:10px;display:block}.review-section p{word-break:break-word;font-size:1.1rem}.correct-answer{color:var(--success);font-weight:700}.status{border-radius:999px;align-self:flex-start;padding:10px 18px;font-weight:600;display:inline-flex}.correct-status{color:var(--success);background:#22c55e1f}.wrong-status{color:var(--danger);background:#ef44441f}.review-actions{gap:18px;margin-top:40px;display:flex}.review-actions .btn,.review-actions .btn-secondary{flex:1}@media (width<=768px){.review-header{margin-bottom:35px}.review-question h2{font-size:1.15rem}.review-actions{flex-direction:column}}.topics-page{background:radial-gradient(circle at top,#252525 0%,#1b1b1b 45%,#181818 100%);min-height:100vh;padding:40px 24px 80px}.topics-container{max-width:1300px;margin:auto}.topics-header{text-align:center;max-width:760px;margin:0 auto 60px}.topics-badge{color:#f59e0b;background:#f59e0b1f;border-radius:999px;align-items:center;gap:10px;margin-bottom:24px;padding:12px 24px;font-size:15px;font-weight:600;display:inline-flex}.topics-header h1{color:#fff;margin-bottom:22px;font-size:clamp(42px,5vw,64px);font-weight:800;line-height:1.1}.topics-header p{color:#9ca3af;font-size:18px;line-height:1.8}.topics-grid{grid-template-columns:repeat(auto-fit,minmax(320px,1fr));gap:32px;display:grid}.topic-card{cursor:pointer;background:#242424;border:1px solid #353535;border-radius:24px;flex-direction:column;min-height:360px;padding:38px;transition:all .3s;display:flex}.topic-card:hover{border-color:#f59e0b;transform:translateY(-8px);box-shadow:0 20px 45px #00000059,0 0 0 1px #f59e0b33}.topic-icon{background:#f59e0b1f;border-radius:18px;justify-content:center;align-items:center;width:72px;height:72px;margin-bottom:28px;font-size:34px;display:flex}.topic-card h2{color:#fff;margin-bottom:18px;font-size:30px;font-weight:700;line-height:1.25}.topic-card p{color:#9ca3af;flex:1;margin-bottom:40px;font-size:16px;line-height:1.8}.topic-card button{width:100%;margin-top:auto}.topic-card .btn{border-radius:14px;padding:15px;font-size:16px;font-weight:700}@media (width<=992px){.topics-page{padding:55px 20px 70px}.topics-grid{grid-template-columns:1fr}}@media (width<=768px){.topics-page{padding:40px 18px 60px}.topics-header{margin-bottom:45px}.topics-badge{padding:10px 20px;font-size:14px}.topics-header h1{font-size:42px}.topics-header p{font-size:16px}.topic-card{min-height:auto;padding:30px}.topic-icon{width:64px;height:64px;margin-bottom:22px;font-size:30px}.topic-card h2{font-size:26px}}@media (width<=480px){.topics-page{padding:30px 16px 50px}.topics-header h1{font-size:34px}.topics-header p{font-size:15px}.topic-card{border-radius:20px;padding:26px}.topic-card h2{font-size:24px}.topic-card p{margin-bottom:28px}}