@import"https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&display=swap";:root{--primary: #2c3e50;--accent: #3b82f6;--accent-hover: #2563eb;--success: #10b981;--success-bg: #d1fae5;--error: #ef4444;--error-bg: #fee2e2;--ai: #8b5cf6;--ai-hover: #7c3aed;--bg-gradient: linear-gradient(135deg, #f6f8fd 0%, #f1f5f9 100%);--glass-bg: rgba(255, 255, 255, .85);--glass-border: rgba(255, 255, 255, .4);--glass-shadow: 0 8px 32px rgba(31, 38, 135, .07);--text-main: #1e293b;--text-muted: #64748b;--border: #e2e8f0}*{box-sizing:border-box;margin:0;padding:0;-webkit-tap-highlight-color:transparent}body{font-family:Inter,-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif;background:var(--bg-gradient);color:var(--text-main);min-height:100vh;display:flex;justify-content:center;padding:10px}#root{width:100%;max-width:600px;display:flex;flex-direction:column;padding:10px 0}.app-container{display:flex;flex-direction:column;overflow:hidden;min-height:80vh}.main-content{flex:1}.empty-state{text-align:center;padding:60px 20px;color:var(--text-muted)}.glass{background:var(--glass-bg);backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);border:1px solid var(--glass-border);box-shadow:var(--glass-shadow);border-radius:16px}.btn{border:none;border-radius:12px;padding:12px 20px;font-size:1rem;font-weight:600;cursor:pointer;transition:all .2s ease;display:inline-flex;align-items:center;justify-content:center;gap:8px}.btn:active{transform:scale(.97)}.btn:disabled{opacity:.6;cursor:not-allowed}.btn-primary{background:var(--accent);color:#fff;box-shadow:0 4px 12px #3b82f640}.btn-primary:hover:not(:disabled){background:var(--accent-hover);transform:translateY(-2px)}.btn-ai{background:linear-gradient(135deg,var(--ai),#c084fc);color:#fff;box-shadow:0 4px 15px #8b5cf64d}.btn-ai:hover:not(:disabled){background:linear-gradient(135deg,var(--ai-hover),var(--ai));transform:translateY(-2px)}.btn-ai.copied{background:linear-gradient(135deg,var(--success),#34d399);pointer-events:none}::-webkit-scrollbar{width:6px}::-webkit-scrollbar-track{background:transparent}::-webkit-scrollbar-thumb{background:#cbd5e1;border-radius:10px}.modal-overlay{position:fixed;inset:0;background:#0006;-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px);display:flex;align-items:center;justify-content:center;z-index:1000;animation:fadeIn .2s ease}.modal-box{padding:30px;text-align:center;max-width:340px;width:90%;animation:fadeIn .3s ease}.modal-btn{border:none;border-radius:10px;padding:10px 24px;font-size:.95rem;font-weight:600;cursor:pointer;transition:all .2s ease}.modal-btn.cancel{background:var(--border);color:var(--text-main)}.modal-btn.cancel:hover{background:#cbd5e1}.modal-btn.confirm{background:var(--error);color:#fff;box-shadow:0 4px 12px #ef44444d}.modal-btn.confirm:hover{background:#dc2626;transform:translateY(-1px)}.header{padding:20px;display:flex;flex-direction:column;gap:15px;background:transparent;backdrop-filter:none;-webkit-backdrop-filter:none;border:none;box-shadow:none;border-radius:0;border-bottom:1px solid rgba(255,255,255,.2)}.header-top{display:flex;justify-content:space-between;align-items:center}.title{font-size:1.25rem;font-weight:700;color:var(--primary);margin:0;letter-spacing:-.5px}.header-actions{display:flex;align-items:center;gap:15px}.lang-toggle{background:#ffffff80;border:1px solid var(--border);border-radius:20px;padding:4px 8px;display:flex;align-items:center;gap:4px;cursor:pointer;transition:all .2s ease}.lang-toggle:hover{background:#fff;border-color:var(--accent)}.lang-icon{font-size:.8rem;font-weight:700;color:var(--text-muted);transition:color .2s}.lang-icon.active{color:var(--accent);transform:scale(1.1)}.lang-divider{font-size:.8rem;color:#cbd5e1}.reset-btn{background:transparent;border:none;color:var(--text-muted);font-size:.85rem;font-weight:500;cursor:pointer;text-decoration:underline;padding:5px}.reset-btn:hover{color:var(--error)}.bank-switcher{display:flex;justify-content:center;background:#f1f5f9;border-radius:12px;padding:5px;overflow-x:auto;scrollbar-width:none;-ms-overflow-style:none;scroll-snap-type:x mandatory;gap:6px;box-shadow:inset 0 2px 4px #0000000d}.bank-switcher::-webkit-scrollbar{display:none}.filter-switcher{display:flex;justify-content:center;gap:10px;margin-top:12px;overflow-x:auto;padding:5px 2px;scrollbar-width:none;-ms-overflow-style:none;scroll-snap-type:x mandatory;-webkit-overflow-scrolling:touch}.filter-switcher::-webkit-scrollbar{display:none}.filter-tab{flex:0 0 auto;min-width:90px;padding:9px 18px;border:none;background:#ffffff73;border-radius:10px;font-weight:600;color:var(--text-muted);cursor:pointer;transition:all .4s cubic-bezier(.175,.885,.32,1.275);white-space:nowrap;font-size:.85rem;display:flex;align-items:center;justify-content:center;gap:6px;scroll-snap-align:center;border:1px solid transparent}.filter-tab:hover{background:#ffffffb3}.filter-tab.active{background:var(--accent);color:#fff;box-shadow:0 8px 20px #0ea5e940;transform:translateY(-2px)}.filter-tab .badge{background:#0000001a;padding:2px 6px;border-radius:10px;font-size:.7rem}.filter-tab.active .badge{background:#fff3}.bank-tab{flex:0 0 auto;min-width:110px;padding:9px 15px;border:none;background:transparent;border-radius:9px;font-size:.9rem;font-weight:600;color:var(--text-muted);cursor:pointer;transition:all .3s cubic-bezier(.4,0,.2,1);scroll-snap-align:center}.bank-tab.active{background:#fff;color:var(--accent);box-shadow:0 4px 15px #00000014;transform:scale(1.02)}.quiz-card{padding:10px 20px;display:flex;flex-direction:column;background:transparent;border:none;box-shadow:none}.status-bar{display:flex;justify-content:space-between;margin-bottom:15px;font-size:.9rem;font-weight:600;color:var(--text-muted)}.progress-badge{font-weight:600;color:var(--accent);cursor:pointer;padding:2px 8px;border-radius:8px;background:#3b82f614;transition:all .2s ease;font-size:.85rem;-webkit-user-select:none;user-select:none}.progress-badge:hover{background:#3b82f626}.progress-popup{position:absolute;top:100%;right:0;margin-top:8px;background:#fff;border:1px solid var(--border);border-radius:12px;padding:12px;min-width:200px;max-width:300px;max-height:250px;overflow-y:auto;box-shadow:0 8px 30px #0000001f;z-index:100;animation:fadeIn .2s ease}.popup-header{font-size:.85rem;font-weight:700;color:var(--text-main);margin-bottom:8px;padding-bottom:6px;border-bottom:1px solid var(--border)}.popup-empty{font-size:.85rem;color:var(--text-muted);text-align:center;padding:10px 0}.popup-grid{display:flex;flex-wrap:wrap;gap:6px}.popup-num{display:inline-flex;align-items:center;justify-content:center;min-width:32px;height:28px;padding:0 6px;border-radius:6px;font-size:.8rem;font-weight:600;background:#eff6ff;color:var(--accent);cursor:pointer;transition:all .15s ease}.popup-num:hover{background:var(--accent);color:#fff;transform:scale(1.05)}.star-btn{background:#fff6;border:1px solid var(--border);border-radius:50%;width:32px;height:32px;display:flex;align-items:center;justify-content:center;cursor:pointer;font-size:1.1rem;color:var(--text-muted);transition:all .2s ease}.star-btn:hover{background:#fff;transform:scale(1.1)}.star-btn.active{color:#f59e0b;background:#fffbeb;border-color:#fcd34d}.progress-container{height:6px;background:var(--border);border-radius:4px;margin-bottom:25px;overflow:hidden}.progress-bar{height:100%;background:var(--accent);transition:width .4s ease;border-radius:4px}.question-text{font-size:1.1rem;line-height:1.6;font-weight:500;margin-bottom:25px;color:var(--text-main);white-space:pre-wrap}.badge{display:inline-block;padding:2px 8px;border-radius:4px;font-size:.75rem;font-weight:700;color:#fff;margin-right:8px;vertical-align:middle}.badge.single{background:#64748b}.badge.multi{background:#f59e0b}.options-grid{display:flex;flex-direction:column;gap:12px}.option-btn{background:#fff;border:2px solid var(--border);padding:16px;border-radius:12px;text-align:left;cursor:pointer;font-size:1rem;transition:all .2s ease;display:flex;gap:12px;align-items:flex-start;color:var(--text-main)}.option-btn:hover:not(.disabled){border-color:#93c5fd;transform:translateY(-1px)}.option-btn.selected{border-color:var(--accent);background:#eff6ff;color:var(--accent-hover)}.option-btn.correct{border-color:var(--success);background:var(--success-bg);color:#065f46}.option-btn.wrong{border-color:var(--error);background:var(--error-bg);color:#991b1b}.option-btn.disabled{cursor:default}.opt-label{font-weight:700;min-width:24px}.opt-text{flex:1;line-height:1.4}.explanation-box{margin-top:25px;padding:20px;border-radius:12px;animation:fadeIn .4s ease}.explanation-box.is-correct{background:#f0fdf4;border-left:5px solid var(--success)}.explanation-box.is-wrong{background:#fef2f2;border-left:5px solid var(--error)}.expl-header{font-size:1.1rem;font-weight:700;margin-bottom:10px}.is-correct .expl-header{color:var(--success)}.is-wrong .expl-header{color:var(--error)}.expl-correct-ans{font-size:1rem;color:var(--text-main);margin-bottom:10px}.expl-text{font-size:.95rem;color:var(--text-muted);line-height:1.6}@keyframes fadeIn{0%{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}.controls{padding:20px;display:flex;flex-direction:column;gap:15px;border-top:1px solid rgba(255,255,255,.2)}.nav-row{display:flex;justify-content:space-between;gap:15px}.nav-btn{flex:1;padding:10px 15px;border-radius:8px;background:#fff;border:1px solid var(--border);color:var(--primary);font-weight:600;cursor:pointer;transition:all .2s ease}.nav-btn:hover:not(:disabled){background:#f8fafc;border-color:#cbd5e1}.nav-btn:disabled{opacity:.5;cursor:not-allowed;background:#f1f5f9}.nav-select{flex:2;padding:8px;border-radius:8px;border:1px solid var(--border);font-size:.95rem;font-weight:600;text-align:center;color:var(--primary);background:#fff;cursor:pointer;appearance:none;-webkit-appearance:none}.nav-select:focus{outline:none;border-color:var(--accent)}.action-row{display:flex;justify-content:center}.action-btn{width:100%;padding:14px;font-size:1.05rem}