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16px;border-radius:8px;font-weight:600;font-size:.97rem;margin-bottom:16px}.feedback.correct{background:#e8f5e9;color:#2e7d32;border:1px solid #a5d6a7}.feedback.wrong{background:#ffebee;color:#c62828;border:1px solid #ef9a9a}.action-btn{padding:10px 24px;border:2px solid #ccc;border-radius:8px;background:#fff;cursor:pointer;font-size:1rem;font-weight:600;color:#333;transition:border-color .15s,background .15s}.action-btn:hover{border-color:#999}.action-btn:disabled{opacity:.4;cursor:not-allowed}.action-btn.primary{background:#1a1a2e;border-color:#1a1a2e;color:#fff}.action-btn.primary:hover:not(:disabled){background:#2d2d4e;border-color:#2d2d4e}.quiz-progress{color:#888;font-size:.9rem;margin-bottom:24px}.quiz-word{text-align:center;margin-bottom:28px;padding:24px;background:#fff;border-radius:12px;border:2px solid #e0e4e8}.big-word{font-size:3rem;font-weight:800;color:#1a1a2e}.quiz-options{display:grid;grid-template-columns:repeat(auto-fill,minmax(190px,1fr));gap:10px;margin-bottom:20px}.category-btn{padding:14px 20px;border:2px solid rgba(0,0,0,.12);border-radius:10px;cursor:pointer;font-size:1rem;font-weight:700;transition:transform .1s,box-shadow .1s,opacity .2s}.category-btn:hover:not([disabled]){transform:translateY(-2px);box-shadow:0 4px 12px #00000026}.category-btn.correct{outline:3px solid #2e7d32;outline-offset:2px}.category-btn.wrong{opacity:.5}.category-btn.dim{opacity:.3;cursor:default}.quiz-result{text-align:center;padding:40px 20px}.result-score{font-size:4.5rem;font-weight:800;color:#1a1a2e;margin-bottom:8px}.quiz-result p{font-size:1.2rem;color:#555;margin-bottom:28px}.chart{display:flex;flex-direction:column;gap:14px}.chart-row{display:flex;gap:16px;align-items:flex-start;background:#fff;border-radius:10px;padding:16px;border:1px solid #e0e4e8}.chart-swatch{min-width:170px;padding:12px 16px;border-radius:8px;font-weight:700;font-size:1rem;text-align:center;border:2px solid rgba(0,0,0,.12);flex-shrink:0}.chart-info{flex:1}.chart-desc{color:#555;margin-bottom:10px;font-size:.95rem}.chart-examples{display:flex;flex-wrap:wrap;gap:8px}.top-bar{display:flex;align-items:flex-end;justify-content:space-between;margin-bottom:28px;border-bottom:2px solid #e0e4e8}.top-bar .tabs{border-bottom:none;margin-bottom:0}.logout-btn{padding:6px 14px;border:1px solid #ccc;border-radius:6px;background:#fff;cursor:pointer;font-size:.82rem;color:#888;white-space:nowrap;margin-bottom:4px;transition:color .15s,border-color .15s}.logout-btn:hover{color:#333;border-color:#999}.login-page{min-height:100vh;display:flex;align-items:center;justify-content:center;background:#f0f4f8}.login-card{background:#fff;border-radius:16px;padding:40px 36px;width:100%;max-width:380px;box-shadow:0 4px 24px #00000014;text-align:center}.login-card h1{font-size:1.8rem;font-weight:800;margin-bottom:8px}.login-card p{color:#666;margin-bottom:24px}.login-form{display:flex;flex-direction:column;gap:12px}.login-input{padding:12px 16px;border:2px solid #e0e4e8;border-radius:8px;font-size:1.1rem;text-align:center;letter-spacing:.1em;outline:none;transition:border-color .15s}.login-input:focus{border-color:#1a1a2e}.login-error{color:#c62828;font-size:.9rem}.app-loading{display:flex;align-items:center;justify-content:center;height:100vh;font-size:1.1rem;color:#888}.progress-stats{display:grid;grid-template-columns:repeat(auto-fill,minmax(140px,1fr));gap:12px;margin-bottom:28px}.stat-card{background:#fff;border:1px solid #e0e4e8;border-radius:12px;padding:20px 16px;text-align:center;display:flex;flex-direction:column;align-items:center;gap:4px}.stat-number{font-size:2.4rem;font-weight:800;color:#1a1a2e;line-height:1}.stat-label{font-size:.85rem;color:#888;font-weight:600}.stat-sub{font-size:.75rem;color:#aaa}.progress-section{background:#fff;border:1px solid #e0e4e8;border-radius:12px;padding:20px;margin-bottom:16px}.progress-section h3{font-size:1.05rem;font-weight:700;margin-bottom:16px}.score-chart{display:flex;align-items:flex-end;gap:6px;height:140px}.score-bar-col{flex:1;display:flex;flex-direction:column;align-items:center;height:100%;gap:4px}.score-bar-pct{font-size:.7rem;color:#888;white-space:nowrap}.score-bar-track{flex:1;width:100%;background:#f0f4f8;border-radius:4px;display:flex;align-items:flex-end;overflow:hidden}.score-bar-fill{width:100%;border-radius:4px 4px 0 0;min-height:4px;transition:height .4s ease}.wrong-words{display:flex;flex-direction:column;gap:10px}.wrong-word-row{display:flex;align-items:center;gap:12px}.wrong-word-cat{color:#555;font-size:.9rem;flex:1}.wrong-word-count{font-size:.85rem;color:#c62828;font-weight:600}.progress-empty{text-align:center;padding:40px 20px;color:#888;line-height:1.8}@media (max-width: 600px){.app-header h1{font-size:1.6rem}.big-word{font-size:2.2rem}.chart-row{flex-direction:column}.chart-swatch{min-width:unset;width:100%}.quiz-options{grid-template-columns:repeat(2,1fr)}.tab-btn{padding:8px 14px;font-size:.85rem}}