:root{--font-primary:"Inter", sans-serif;--font-header:"Outfit", sans-serif;--bg-primary:#f8fafc;--bg-secondary:#fff;--bg-tertiary:#f1f5f9;--border-color:#e2e8f0;--border-focus:#6366f1;--text-primary:#0f172a;--text-secondary:#475569;--text-muted:#94a3b8;--primary-color:#6366f1;--primary-light:#e0e7ff;--primary-dark:#4f46e5;--primary-gradient:linear-gradient(135deg, #6366f1, #a855f7);--primary-glow:#6366f126;--success-color:#10b981;--success-light:#ecfdf5;--success-border:#a7f3d0;--danger-color:#f43f5e;--danger-light:#fff1f2;--danger-border:#fecdd3;--warning-color:#f59e0b;--warning-light:#fef3c7;--warning-border:#fde68a;--shadow-sm:0 1px 2px 0 #0000000d;--shadow-md:0 4px 6px -1px #0000000d, 0 2px 4px -2px #0000000d;--shadow-lg:0 10px 15px -3px #00000014, 0 4px 6px -4px #00000014;--shadow-xl:0 20px 25px -5px #0000001a, 0 8px 10px -6px #0000001a;--shadow-glow:0 0 20px 2px #6366f140;--radius-sm:8px;--radius-md:12px;--radius-lg:16px;--radius-xl:24px;--radius-full:9999px;--transition-fast:.15s ease;--transition-normal:.3s ease;--transition-slow:.5s ease;--header-height:70px}[data-theme=dark]{--bg-primary:#090d16;--bg-secondary:#111827;--bg-tertiary:#1f2937;--border-color:#1f2937;--border-focus:#818cf8;--text-primary:#f8fafc;--text-secondary:#94a3b8;--text-muted:#64748b;--primary-color:#818cf8;--primary-light:#1e1b4b;--primary-dark:#4f46e5;--primary-gradient:linear-gradient(135deg, #818cf8, #c084fc);--primary-glow:#818cf833;--success-color:#34d399;--success-light:#064e3b;--success-border:#065f46;--danger-color:#fb7185;--danger-light:#4c0519;--danger-border:#881337;--warning-color:#fbbf24;--warning-light:#78350f;--warning-border:#92400e;--shadow-sm:0 1px 2px 0 #0000004d;--shadow-md:0 4px 6px -1px #0000004d, 0 2px 4px -2px #0000004d;--shadow-lg:0 10px 15px -3px #0006, 0 4px 6px -4px #0006;--shadow-xl:0 20px 25px -5px #00000080, 0 8px 10px -6px #00000080}*,:before,:after{box-sizing:border-box;margin:0;padding:0}body{font-family:var(--font-primary);background-color:var(--bg-primary);color:var(--text-primary);-webkit-font-smoothing:antialiased;min-height:100vh;transition:background-color var(--transition-normal), color var(--transition-normal);flex-direction:column;line-height:1.5;display:flex;overflow-x:hidden}::-webkit-scrollbar{width:10px;height:10px}::-webkit-scrollbar-track{background:var(--bg-primary)}::-webkit-scrollbar-thumb{background:var(--border-color);border-radius:var(--radius-full)}::-webkit-scrollbar-thumb:hover{background:var(--text-muted)}.app-header{height:var(--header-height);background-color:var(--bg-secondary);-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);border-bottom:1px solid var(--border-color);z-index:100;box-shadow:var(--shadow-sm);transition:background-color var(--transition-normal), border-color var(--transition-normal);align-items:center;display:flex;position:sticky;top:0}.header-container{justify-content:space-between;align-items:center;width:100%;max-width:1280px;margin:0 auto;padding:0 24px;display:flex}.logo{font-family:var(--font-header);background:var(--primary-gradient);-webkit-text-fill-color:transparent;-webkit-background-clip:text;background-clip:text;align-items:center;gap:12px;font-size:1.25rem;font-weight:700;display:flex}.logo i{background:var(--primary-gradient);-webkit-text-fill-color:transparent;-webkit-background-clip:text;background-clip:text;font-size:1.5rem}.theme-btn{background:var(--bg-tertiary);border:1px solid var(--border-color);color:var(--text-secondary);cursor:pointer;border-radius:var(--radius-md);width:40px;height:40px;transition:all var(--transition-fast);justify-content:center;align-items:center;display:flex}.theme-btn:hover{background:var(--border-color);color:var(--text-primary);transform:translateY(-2px)}.header-left{align-items:center;gap:16px;display:flex}.btn-header-back{background:var(--bg-tertiary);border:1px solid var(--border-color);color:var(--text-secondary);cursor:pointer;border-radius:var(--radius-md);width:40px;height:40px;transition:all var(--transition-fast);justify-content:center;align-items:center;display:flex}.btn-header-back:hover{background:var(--border-color);color:var(--text-primary);transform:translateY(-2px)}.btn-header-back.hidden{display:none!important}.main-container{flex-direction:column;flex:1;width:100%;max-width:1280px;margin:0 auto;padding:40px 24px;display:flex}.screen{opacity:0;transition:opacity var(--transition-normal), transform var(--transition-normal);display:none;transform:translateY(15px)}.screen.active{opacity:1;display:block;transform:translateY(0)}.btn{font-family:var(--font-primary);border-radius:var(--radius-md);cursor:pointer;transition:all var(--transition-fast);-webkit-user-select:none;user-select:none;border:1px solid #0000;outline:none;justify-content:center;align-items:center;gap:10px;padding:12px 24px;font-size:.95rem;font-weight:600;display:inline-flex}.btn:active{transform:scale(.97)}.btn-primary{background:var(--primary-gradient);color:#fff;box-shadow:var(--shadow-md)}.btn-primary:hover{box-shadow:var(--shadow-glow), var(--shadow-lg);filter:brightness(1.05)}.btn-secondary{background:var(--bg-secondary);border-color:var(--border-color);color:var(--text-primary);box-shadow:var(--shadow-sm)}.btn-secondary:hover:not(:disabled){background:var(--bg-tertiary);border-color:var(--text-muted)}.btn-secondary:disabled{opacity:.5;cursor:not-allowed}.btn-tertiary{color:var(--text-secondary);border:1px dashed var(--border-color);background:0 0}.btn-tertiary:hover{color:var(--text-primary);border-color:var(--text-secondary);background-color:var(--bg-tertiary)}.btn-danger{background:var(--danger-color);color:#fff}.btn-danger:hover{background:#e11d48;box-shadow:0 0 15px #f43f5e4d}.btn-large{border-radius:var(--radius-lg);padding:16px 36px;font-size:1.1rem}.btn-full{width:100%}.auth-card{background-color:var(--bg-secondary);border:1px solid var(--border-color);border-radius:var(--radius-xl);max-width:480px;box-shadow:var(--shadow-xl);margin:60px auto;padding:40px;position:relative;overflow:hidden}.auth-card:before{content:"";background:radial-gradient(circle, var(--primary-glow) 0%, transparent 60%);z-index:0;pointer-events:none;width:200%;height:200%;position:absolute;top:-50%;left:-50%}.auth-tabs{z-index:1;background-color:var(--bg-tertiary);border-radius:var(--radius-md);border:1px solid var(--border-color);margin-bottom:32px;padding:6px;display:flex;position:relative}.auth-tab-btn{font-family:var(--font-primary);color:var(--text-secondary);cursor:pointer;border-radius:var(--radius-sm);transition:all var(--transition-fast);background:0 0;border:none;flex:1;padding:12px;font-size:.95rem;font-weight:600}.auth-tab-btn:hover{color:var(--text-primary)}.auth-tab-btn.active{background-color:var(--bg-secondary);color:var(--primary-color);box-shadow:var(--shadow-sm)}.auth-form{z-index:1;position:relative}.auth-form-title{font-family:var(--font-header);color:var(--text-primary);margin-bottom:8px;font-size:1.8rem;font-weight:800}.auth-form-subtitle{color:var(--text-secondary);margin-bottom:28px;font-size:.9rem}.form-group{text-align:left;margin-bottom:20px}.form-group label{color:var(--text-secondary);text-transform:uppercase;letter-spacing:.03em;margin-bottom:8px;font-size:.85rem;font-weight:600;display:block}.input-wrapper{align-items:center;display:flex;position:relative}.input-icon{color:var(--text-muted);font-size:1rem;position:absolute;left:16px}.input-wrapper input{width:100%;font-family:var(--font-primary);color:var(--text-primary);background-color:var(--bg-tertiary);border:1px solid var(--border-color);border-radius:var(--radius-md);transition:all var(--transition-fast);outline:none;padding:14px 16px 14px 44px;font-size:.95rem}.input-wrapper input:focus{border-color:var(--border-focus);background-color:var(--bg-secondary);box-shadow:0 0 0 3px var(--primary-glow)}.error-message{color:var(--danger-color);background-color:var(--danger-light);border:1px solid var(--danger-border);border-radius:var(--radius-md);text-align:left;margin-bottom:20px;padding:12px 16px;font-size:.85rem;font-weight:500}.auth-divider{text-align:center;color:var(--text-muted);letter-spacing:.05em;z-index:1;align-items:center;margin:20px 0;font-size:.85rem;font-weight:600;display:flex;position:relative}.auth-divider:before,.auth-divider:after{content:"";border-bottom:1px solid var(--border-color);flex:1}.auth-divider:before{margin-right:.5em}.auth-divider:after{margin-left:.5em}.btn-google{background-color:var(--bg-tertiary);border:1px solid var(--border-color);color:var(--text-primary);cursor:pointer;transition:all var(--transition-fast);z-index:1;border-radius:var(--radius-md);justify-content:center;align-items:center;gap:10px;width:100%;padding:14px 16px;font-weight:600;display:flex;position:relative}.btn-google:hover{background-color:var(--border-color);border-color:var(--text-muted)}.dashboard-container{width:100%;margin:0;padding:0}.dashboard-header-card{background:var(--primary-gradient);color:#fff;border-radius:var(--radius-xl);box-shadow:var(--shadow-lg);text-align:left;justify-content:space-between;align-items:center;margin-bottom:40px;padding:32px;display:flex}.dashboard-user-info{align-items:center;gap:20px;display:flex}.user-avatar-icon{opacity:.9;font-size:2.8rem}#dashboard-welcome-title{font-family:var(--font-header);color:#fff;margin:0 0 4px;font-size:1.8rem;font-weight:800}.dashboard-welcome-subtitle{opacity:.85;margin:0;font-size:.95rem}.dashboard-section{text-align:left;margin-bottom:48px}.section-title{font-family:var(--font-header);color:var(--text-primary);align-items:center;gap:12px;margin-bottom:24px;font-size:1.4rem;font-weight:750;display:flex}.quiz-grid{grid-template-columns:repeat(auto-fill,minmax(320px,1fr));gap:24px;display:grid}.quiz-card{background-color:var(--bg-secondary);border:1px solid var(--border-color);border-radius:var(--radius-lg);box-shadow:var(--shadow-sm);transition:all var(--transition-medium);flex-direction:column;justify-content:space-between;padding:28px;display:flex;position:relative;overflow:hidden}.quiz-card:before{content:"";background:var(--primary-gradient);opacity:0;width:100%;height:4px;transition:opacity var(--transition-fast);position:absolute;top:0;left:0}.quiz-card:hover{box-shadow:var(--shadow-lg);border-color:var(--border-focus);transform:translateY(-4px)}.quiz-card:hover:before{opacity:1}.quiz-card-badge{text-transform:uppercase;letter-spacing:.05em;color:var(--primary-color);background-color:var(--primary-light);border-radius:var(--radius-full);align-self:flex-start;margin-bottom:16px;padding:4px 10px;font-size:.75rem;font-weight:700}.quiz-card-title{font-family:var(--font-header);color:var(--text-primary);margin:0 0 10px;font-size:1.15rem;font-weight:700;line-height:1.4}.quiz-card-desc{color:var(--text-secondary);flex-grow:1;margin:0 0 20px;font-size:.88rem;line-height:1.5}.quiz-card-meta{color:var(--text-muted);border-top:1px solid var(--border-color);gap:16px;margin-bottom:24px;padding-top:16px;font-size:.8rem;display:flex}.quiz-card-meta span{align-items:center;gap:6px;font-weight:600;display:flex}.quiz-card-meta i{color:var(--primary-color)}.quiz-loading-placeholder{text-align:center;color:var(--text-muted);background-color:var(--bg-secondary);border:1px dashed var(--border-color);border-radius:var(--radius-lg);grid-column:1/-1;padding:48px;font-style:italic}.btn-review-history{border-radius:var(--radius-sm);width:auto;padding:6px 12px;font-size:.8rem;font-weight:600}.splash-card{background-color:var(--bg-secondary);border:1px solid var(--border-color);border-radius:var(--radius-xl);max-width:680px;box-shadow:var(--shadow-lg);text-align:center;margin:40px auto;padding:48px;position:relative;overflow:hidden}.splash-card:before{content:"";background:radial-gradient(circle, var(--primary-glow) 0%, transparent 60%);z-index:0;pointer-events:none;width:200%;height:200%;position:absolute;top:-50%;left:-50%}.splash-badge{z-index:1;background-color:var(--primary-light);color:var(--primary-color);letter-spacing:.05em;text-transform:uppercase;border-radius:var(--radius-full);margin-bottom:24px;padding:6px 16px;font-size:.8rem;font-weight:600;display:inline-block;position:relative}.splash-title{z-index:1;font-family:var(--font-header);margin-bottom:16px;font-size:2.25rem;font-weight:800;line-height:1.25;position:relative}.splash-desc{z-index:1;color:var(--text-secondary);max-width:580px;margin-bottom:40px;margin-left:auto;margin-right:auto;font-size:1.05rem;position:relative}.rules-grid{z-index:1;text-align:left;grid-template-columns:1fr 1fr;gap:20px;margin-bottom:40px;display:grid;position:relative}.rule-item{background-color:var(--bg-tertiary);border-radius:var(--radius-md);border:1px solid var(--border-color);align-items:center;gap:16px;padding:16px 20px;display:flex}.rule-icon{color:var(--primary-color);font-size:1.5rem}.rule-label{color:var(--text-muted);text-transform:uppercase;letter-spacing:.02em;font-size:.75rem;font-weight:600}.rule-value{color:var(--text-primary);font-size:.95rem;font-weight:600}.username-section{z-index:1;text-align:left;max-width:400px;margin:0 auto 32px;position:relative}.username-label{color:var(--text-secondary);margin-bottom:8px;font-size:.9rem;font-weight:600;display:block}.username-input-wrapper{align-items:center;display:flex;position:relative}.username-icon{color:var(--text-muted);font-size:1rem;position:absolute;left:16px}.username-input{width:100%;font-family:var(--font-primary);color:var(--text-primary);background-color:var(--bg-tertiary);border:1px solid var(--border-color);border-radius:var(--radius-md);transition:all var(--transition-fast);outline:none;padding:14px 16px 14px 44px;font-size:1rem;font-weight:500}.username-input:focus{border-color:var(--border-focus);background-color:var(--bg-secondary);box-shadow:0 0 0 3px var(--primary-glow)}.username-error-msg{color:var(--danger-color);transition:opacity var(--transition-fast);margin-top:6px;font-size:.8rem;font-weight:500}.hidden{display:none!important}.history-dashboard{background-color:var(--bg-secondary);border:1px solid var(--border-color);border-radius:var(--radius-xl);box-shadow:var(--shadow-md);margin-top:24px;padding:32px}.history-title{font-family:var(--font-header);align-items:center;gap:10px;margin-bottom:4px;font-size:1.35rem;font-weight:700;display:flex}.history-subtitle{color:var(--text-secondary);margin-bottom:24px;font-size:.85rem}.history-table-wrapper{border-radius:var(--radius-md);border:1px solid var(--border-color);background-color:var(--bg-primary);overflow-x:auto}.history-table{border-collapse:collapse;text-align:left;width:100%;font-size:.9rem}.history-table th{background-color:var(--bg-tertiary);color:var(--text-secondary);border-bottom:1px solid var(--border-color);text-transform:uppercase;letter-spacing:.05em;padding:14px 16px;font-size:.75rem;font-weight:600}.history-table td{border-bottom:1px solid var(--border-color);color:var(--text-primary);padding:12px 16px;font-weight:500}.history-table tr:last-child td{border-bottom:none}.history-table tr:hover{background-color:var(--bg-tertiary)}.history-loading{text-align:center;color:var(--text-muted);font-style:italic;padding:32px!important}.history-badge{border-radius:var(--radius-full);padding:3px 10px;font-size:.75rem;font-weight:700;display:inline-block}.history-badge.pass{background-color:var(--success-light);color:var(--success-color)}.history-badge.fail{background-color:var(--danger-light);color:var(--danger-color)}#btn-start{z-index:1;position:relative}.quiz-layout{grid-template-columns:1fr 320px;align-items:start;gap:32px;display:grid}.quiz-main{background-color:var(--bg-secondary);border:1px solid var(--border-color);border-radius:var(--radius-xl);box-shadow:var(--shadow-md);padding:32px}.quiz-progress-wrapper{margin-bottom:32px}.quiz-progress-text{justify-content:space-between;align-items:center;margin-bottom:12px;font-size:.95rem;font-weight:600;display:flex}#question-index-indicator{color:var(--text-secondary)}#quiz-timer{color:var(--primary-color);font-family:var(--font-header);align-items:center;gap:6px;font-size:1.1rem;display:flex}#quiz-timer.low-time{color:var(--danger-color);animation:1s infinite alternate pulse-red}@keyframes pulse-red{0%{transform:scale(1)}to{transform:scale(1.05)}}.progress-bar-container{background-color:var(--bg-tertiary);border-radius:var(--radius-full);height:8px;overflow:hidden}.progress-bar-fill{background:var(--primary-gradient);border-radius:var(--radius-full);width:0%;height:100%;transition:width var(--transition-normal) cubic-bezier(.4, 0, .2, 1)}.question-card{margin-bottom:32px}.question-text{font-family:var(--font-header);margin-bottom:24px;font-size:1.35rem;font-weight:700;line-height:1.4}.options-container{flex-direction:column;gap:16px;display:flex}.option-card{background-color:var(--bg-secondary);border:2px solid var(--border-color);border-radius:var(--radius-md);cursor:pointer;-webkit-user-select:none;user-select:none;transition:all var(--transition-fast);align-items:center;gap:16px;padding:18px 24px;display:flex}.option-card:hover{border-color:var(--text-muted);background-color:var(--bg-tertiary);transform:translateY(-1px)}.option-card.selected{border-color:var(--border-focus);background-color:var(--primary-light);box-shadow:var(--shadow-sm)}.option-circle{border-radius:var(--radius-full);border:2px solid var(--text-muted);width:22px;height:22px;transition:all var(--transition-fast);flex-shrink:0;justify-content:center;align-items:center;display:flex}.option-card.selected .option-circle{border-color:var(--primary-color);background-color:var(--primary-color)}.option-circle:after{content:"";border-radius:var(--radius-full);width:8px;height:8px;transition:transform var(--transition-fast) cubic-bezier(.175, .885, .32, 1.275);background-color:#fff;transform:scale(0)}.option-card.selected .option-circle:after{transform:scale(1)}.option-label{color:var(--text-primary);font-size:1rem;font-weight:500;line-height:1.4}.option-card.selected .option-label{color:var(--primary-dark)}.quiz-actions{border-top:1px solid var(--border-color);justify-content:space-between;align-items:center;gap:16px;padding-top:24px;display:flex}.sidebar-card{background-color:var(--bg-secondary);border:1px solid var(--border-color);border-radius:var(--radius-xl);box-shadow:var(--shadow-md);padding:24px;position:sticky;top:94px}.sidebar-title{font-family:var(--font-header);margin-bottom:4px;font-size:1.15rem;font-weight:700}.sidebar-subtitle{color:var(--text-muted);margin-bottom:20px;font-size:.8rem}.nav-grid{grid-template-columns:repeat(5,1fr);gap:10px;margin-bottom:20px;display:grid}.nav-grid-btn{background-color:var(--bg-secondary);border:1px solid var(--border-color);height:42px;color:var(--text-secondary);border-radius:var(--radius-sm);cursor:pointer;transition:all var(--transition-fast);justify-content:center;align-items:center;font-size:.9rem;font-weight:600;display:flex;position:relative}.nav-grid-btn:hover{background-color:var(--bg-tertiary);border-color:var(--text-secondary)}.nav-grid-btn.current{border:2px solid var(--primary-color);color:var(--primary-color);background-color:var(--primary-light);box-shadow:var(--shadow-sm)}.nav-grid-btn.answered{background-color:var(--primary-color);border-color:var(--primary-color);color:#fff}.nav-grid-btn.answered.current{border:2px solid var(--text-primary)}.nav-grid-btn.flagged{border:2px dashed var(--warning-color);color:var(--warning-color);background-color:var(--warning-light)}.nav-grid-btn.flagged.current{border:2.5px solid var(--warning-color)}.legend-container{border-top:1px solid var(--border-color);flex-direction:column;gap:8px;margin-bottom:20px;padding:16px 0;display:flex}.legend-item{color:var(--text-secondary);align-items:center;gap:8px;font-size:.8rem;font-weight:500;display:flex}.legend-dot{border-radius:var(--radius-full);width:10px;height:10px}.legend-current{border:2.5px solid var(--primary-color);background-color:var(--primary-light)}.legend-answered{background-color:var(--primary-color)}.legend-flagged{background-color:var(--warning-light);border:1.5px dashed var(--warning-color)}.legend-unanswered{background-color:var(--bg-secondary);border:1px solid var(--border-color)}.result-container{flex-direction:column;gap:32px;max-width:900px;margin:0 auto;display:flex}.result-dashboard{background-color:var(--bg-secondary);border:1px solid var(--border-color);border-radius:var(--radius-xl);box-shadow:var(--shadow-lg);text-align:center;padding:40px}.result-header{margin-bottom:32px}.status-badge{text-transform:uppercase;letter-spacing:.05em;border-radius:var(--radius-full);margin-bottom:16px;padding:6px 16px;font-size:.85rem;font-weight:700;display:inline-block}.status-badge.pass{background-color:var(--success-light);color:var(--success-color);border:1px solid var(--success-border)}.status-badge.fail{background-color:var(--danger-light);color:var(--danger-color);border:1px solid var(--danger-border)}.result-title{font-family:var(--font-header);margin-bottom:8px;font-size:2rem;font-weight:800}.result-message{color:var(--text-secondary);font-size:1.05rem}.result-stats-row{flex-wrap:wrap;justify-content:center;align-items:center;gap:60px;margin-bottom:40px;display:flex}.score-ring-container{width:140px;height:140px;position:relative}.score-ring{width:100%;height:100%;transform:rotate(-90deg)}.score-ring-bg{fill:none;stroke:var(--bg-tertiary);stroke-width:8px}.score-ring-fill{fill:none;stroke:var(--primary-color);stroke-width:8px;stroke-linecap:round;transition:stroke-dashoffset var(--transition-slow) ease-in-out}.score-ring-container.pass .score-ring-fill{stroke:var(--success-color)}.score-ring-container.fail .score-ring-fill{stroke:var(--danger-color)}.score-ring-text{flex-direction:column;align-items:center;line-height:1;display:flex;position:absolute;top:50%;left:50%;transform:translate(-50%,-50%)}.score-value{font-family:var(--font-header);color:var(--text-primary);font-size:2.25rem;font-weight:800}.score-label{color:var(--text-muted);text-transform:uppercase;margin-top:4px;font-size:.75rem;font-weight:600}.stats-grid{flex:1;grid-template-columns:1fr 1fr;gap:16px;max-width:440px;display:grid}.stat-card{background-color:var(--bg-tertiary);border:1px solid var(--border-color);border-radius:var(--radius-md);text-align:left;align-items:center;gap:14px;padding:16px 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