/* ===== BASE STYLES ===== */
:root {
    --primary: #FF6B6B;
    --primary-dark: #FF5252;
    --accent: #4ECDC4;
    --accent-dark: #3DBDB4;
    --success: #4CAF50;
    --warning: #FF9800;
    --danger: #FF5252;
    --dark: #2D3436;
    --dark-light: #636E72;
    --light: #F9FAFC;
    --border: #E0E0E0;
    --shadow: 0 10px 30px rgba(0,0,0,0.1);
    --radius: 12px;
    --transition: all 0.3s ease;
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Poppins', sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 20px;
    color: var(--dark);
}

/* ===== ADMIN BUTTON ===== */
#adminBtn {
    position: fixed;
    top: 20px;
    right: 20px;
    background: var(--dark);
    color: white;
    border: none;
    padding: 12px 20px;
    border-radius: 50px;
    cursor: pointer;
    font-weight: 600;
    font-size: 14px;
    display: flex;
    align-items: center;
    gap: 8px;
    z-index: 1000;
    box-shadow: var(--shadow);
    transition: var(--transition);
}

#adminBtn:hover {
    background: var(--primary);
    transform: translateY(-2px);
}

/* ===== QUIZ CONTAINER ===== */
.quiz-container {
    background: white;
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    width: 100%;
    max-width: 900px;
    overflow: hidden;
    animation: fadeIn 0.5s ease;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

/* ===== SCREENS ===== */
.screen {
    padding: 40px;
}

.screen-content {
    max-width: 800px;
    margin: 0 auto;
}

/* ===== LOADING SCREEN ===== */
.loading-content {
    text-align: center;
    padding: 60px 20px;
}

.loader {
    display: flex;
    justify-content: center;
    gap: 8px;
    margin-bottom: 30px;
}

.dot {
    width: 12px;
    height: 12px;
    background: var(--accent);
    border-radius: 50%;
    animation: bounce 1.4s infinite ease-in-out;
}

.dot:nth-child(1) { animation-delay: -0.32s; }
.dot:nth-child(2) { animation-delay: -0.16s; }

@keyframes bounce {
    0%, 80%, 100% { transform: scale(0.8); opacity: 0.5; }
    40% { transform: scale(1); opacity: 1; }
}

/* ===== REGISTRATION SCREEN ===== */
.logo {
    text-align: center;
    margin-bottom: 40px;
}

.logo i {
    font-size: 48px;
    color: var(--primary);
    margin-bottom: 15px;
}

.logo h1 {
    color: var(--dark);
    font-size: 36px;
    font-weight: 700;
}

.welcome-message {
    text-align: center;
    margin-bottom: 40px;
}

.welcome-message h2 {
    color: var(--dark);
    font-size: 28px;
    margin-bottom: 10px;
}

.welcome-message p {
    color: var(--dark-light);
    font-size: 16px;
}

.form-group {
    margin-bottom: 40px;
}

.input-with-icon {
    position: relative;
    margin-bottom: 20px;
}

.input-with-icon i {
    position: absolute;
    left: 20px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--dark-light);
}

.input-with-icon input {
    width: 100%;
    padding: 18px 20px 18px 50px;
    border: 2px solid var(--border);
    border-radius: var(--radius);
    font-size: 16px;
    transition: var(--transition);
}

.input-with-icon input:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(78, 205, 196, 0.2);
}

.timer-selection {
    margin-bottom: 40px;
}

.timer-selection h3 {
    color: var(--dark);
    margin-bottom: 20px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.timer-options {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 15px;
}

.timer-option {
    padding: 20px;
    border: 2px solid var(--border);
    background: white;
    border-radius: var(--radius);
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
}

.timer-option:hover {
    border-color: var(--accent);
    transform: translateY(-2px);
}

.timer-option.active {
    border-color: var(--primary);
    background: var(--primary);
    color: white;
}

.timer-option .time {
    font-size: 24px;
    font-weight: 700;
}

.timer-option .label {
    font-size: 14px;
    opacity: 0.9;
}

.instructions {
    background: var(--light);
    padding: 25px;
    border-radius: var(--radius);
    margin-bottom: 40px;
}

.instructions h3 {
    color: var(--dark);
    margin-bottom: 15px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.instructions ul {
    list-style: none;
}

.instructions li {
    margin-bottom: 10px;
    display: flex;
    align-items: center;
    gap: 12px;
    color: var(--dark-light);
}

.instructions li i {
    color: var(--success);
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary), var(--primary-dark));
    color: white;
    border: none;
    padding: 20px 40px;
    border-radius: var(--radius);
    font-size: 18px;
    font-weight: 600;
    cursor: pointer;
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    transition: var(--transition);
}

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 10px 20px rgba(255, 107, 107, 0.3);
}

.privacy-note {
    text-align: center;
    margin-top: 20px;
    color: var(--dark-light);
    font-size: 14px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
}

/* ===== QUIZ SCREEN ===== */
.quiz-header {
    background: linear-gradient(135deg, var(--primary), var(--accent));
    color: white;
    padding: 25px 40px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.user-info {
    display: flex;
    align-items: center;
    gap: 15px;
}

.avatar {
    width: 50px;
    height: 50px;
    background: rgba(255,255,255,0.2);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
}

.user-info h4 {
    font-size: 18px;
    margin-bottom: 5px;
}

.user-info p {
    font-size: 14px;
    opacity: 0.9;
}

.quiz-stats {
    display: flex;
    gap: 30px;
}

.stat {
    text-align: center;
}

.stat-value {
    font-size: 28px;
    font-weight: 700;
    margin-bottom: 5px;
}

.stat-label {
    font-size: 12px;
    opacity: 0.9;
    text-transform: uppercase;
    letter-spacing: 1px;
}

.progress-container {
    padding: 0 40px;
    background: var(--light);
}

.progress-bar {
    height: 6px;
    background: var(--border);
    border-radius: 3px;
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--primary), var(--accent));
    width: 0%;
    transition: width 0.5s ease;
}

.question-container {
    padding: 40px;
}

.question-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 30px;
}

.question-header h3 {
    color: var(--dark);
    font-size: 20px;
}

.btn-hint {
    background: var(--warning);
    color: white;
    border: none;
    padding: 12px 24px;
    border-radius: var(--radius);
    font-weight: 600;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 8px;
    transition: var(--transition);
}

.btn-hint:hover {
    opacity: 0.9;
    transform: translateY(-2px);
}

.question-text {
    font-size: 20px;
    line-height: 1.6;
    color: var(--dark);
    margin-bottom: 30px;
    padding: 25px;
    background: var(--light);
    border-radius: var(--radius);
    border-left: 5px solid var(--accent);
}

.options-container {
    display: grid;
    gap: 15px;
    margin-bottom: 30px;
}

.option-btn {
    padding: 20px;
    border: 2px solid var(--border);
    background: white;
    border-radius: var(--radius);
    text-align: left;
    font-size: 16px;
    cursor: pointer;
    transition: var(--transition);
    display: flex;
    align-items: center;
    gap: 15px;
}

.option-btn:hover:not(:disabled) {
    border-color: var(--accent);
    background: rgba(78, 205, 196, 0.1);
    transform: translateX(5px);
}

.option-btn:disabled {
    opacity: 0.7;
    cursor: not-allowed;
}

.option-label {
    width: 36px;
    height: 36px;
    background: var(--accent);
    color: white;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: 700;
    flex-shrink: 0;
}

.option-text {
    flex: 1;
}

.option-btn.correct {
    background: #E8F5E9;
    border-color: var(--success);
}

.option-btn.incorrect {
    background: #FFEBEE;
    border-color: var(--danger);
}

.hint-container {
    background: #FFF8E1;
    padding: 20px;
    border-radius: var(--radius);
    border-left: 4px solid var(--warning);
    margin-bottom: 20px;
}

.hint-content {
    display: flex;
    align-items: flex-start;
    gap: 12px;
    color: var(--dark);
}

.feedback-container {
    background: var(--light);
    padding: 25px;
    border-radius: var(--radius);
    margin-top: 20px;
}

.feedback-content {
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 20px;
}

.feedback-content.correct {
    color: var(--success);
}

.feedback-content.incorrect {
    color: var(--danger);
}

.btn-explanation {
    background: var(--dark);
    color: white;
    border: none;
    padding: 12px 24px;
    border-radius: var(--radius);
    font-weight: 600;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 8px;
    transition: var(--transition);
}

.btn-explanation:hover {
    background: var(--dark-light);
}

.explanation-content {
    margin-top: 20px;
    padding: 20px;
    background: white;
    border-radius: var(--radius);
    border: 1px solid var(--border);
    display: none;
}

.explanation-content.show {
    display: block;
    animation: slideDown 0.3s ease;
}

@keyframes slideDown {
    from { opacity: 0; transform: translateY(-10px); }
    to { opacity: 1; transform: translateY(0); }
}

.quiz-controls {
    padding: 30px 40px;
    border-top: 1px solid var(--border);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.btn-secondary {
    background: white;
    color: var(--dark);
    border: 2px solid var(--border);
    padding: 15px 30px;
    border-radius: var(--radius);
    font-weight: 600;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 8px;
    transition: var(--transition);
}

.btn-secondary:hover:not(:disabled) {
    border-color: var(--accent);
    color: var(--accent);
}

.btn-secondary:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

/* ===== RESULTS SCREEN ===== */
.results-content {
    text-align: center;
}

.results-header {
    margin-bottom: 40px;
}

.trophy {
    font-size: 60px;
    color: var(--warning);
    margin-bottom: 20px;
}

.results-header h1 {
    color: var(--dark);
    font-size: 36px;
    margin-bottom: 10px;
}

.results-header p {
    color: var(--dark-light);
    font-size: 18px;
}

.score-display {
    margin-bottom: 50px;
}

.score-circle {
    width: 200px;
    height: 200px;
    background: linear-gradient(135deg, var(--primary), var(--accent));
    border-radius: 50%;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    color: white;
    margin: 0 auto 30px;
    box-shadow: 0 15px 35px rgba(255, 107, 107, 0.3);
    animation: pulse 2s infinite;
}

@keyframes pulse {
    0%, 100% { transform: scale(1); }
    50% { transform: scale(1.05); }
}

.score-value {
    font-size: 48px;
    font-weight: 700;
    line-height: 1;
}

.score-percentage {
    font-size: 24px;
    opacity: 0.9;
    margin-top: 10px;
}

.score-breakdown {
    display: flex;
    justify-content: center;
    gap: 30px;
}

.breakdown-item {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.breakdown-item .count {
    font-size: 36px;
    font-weight: 700;
    margin-bottom: 5px;
}

.breakdown-item .label {
    font-size: 14px;
    color: var(--dark-light);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.breakdown-item.correct .count {
    color: var(--success);
}

.breakdown-item.incorrect .count {
    color: var(--danger);
}

.breakdown-item.skipped .count {
    color: var(--warning);
}

.performance-stats {
    margin-bottom: 50px;
}

.performance-stats h3 {
    color: var(--dark);
    margin-bottom: 30px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
    font-size: 24px;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
}

.stat-card {
    background: var(--light);
    padding: 25px;
    border-radius: var(--radius);
    text-align: center;
    transition: var(--transition);
}

.stat-card:hover {
    transform: translateY(-5px);
    box-shadow: var(--shadow);
}

.stat-card i {
    font-size: 32px;
    color: var(--accent);
    margin-bottom: 15px;
}

.stat-card .stat-value {
    font-size: 28px;
    font-weight: 700;
    color: var(--dark);
    margin-bottom: 5px;
}

.stat-card .stat-label {
    font-size: 14px;
    color: var(--dark-light);
    text-transform: uppercase;
    letter-spacing: 1px;
}

.email-section {
    background: var(--light);
    padding: 30px;
    border-radius: var(--radius);
    margin-bottom: 40px;
}

.email-section h3 {
    color: var(--dark);
    margin-bottom: 15px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 12px;
}

.email-section p {
    color: var(--dark-light);
    margin-bottom: 20px;
}

.email-input-group {
    display: flex;
    gap: 15px;
    max-width: 500px;
    margin: 0 auto;
}

.email-input-group input {
    flex: 1;
    padding: 15px 20px;
    border: 2px solid var(--border);
    border-radius: var(--radius);
    font-size: 16px;
}

.email-input-group input:focus {
    outline: none;
    border-color: var(--accent);
}

.email-status {
    margin-top: 20px;
    padding: 15px;
    border-radius: var(--radius);
    display: none;
}

.email-status.success {
    background: #E8F5E9;
    color: var(--success);
    display: block;
}

.email-status.error {
    background: #FFEBEE;
    color: var(--danger);
    display: block;
}

.results-actions {
    display: flex;
    justify-content: center;
    gap: 20px;
    margin-bottom: 40px;
}

.btn-action {
    background: white;
    color: var(--dark);
    border: 2px solid var(--border);
    padding: 18px 30px;
    border-radius: var(--radius);
    font-weight: 600;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 12px;
    transition: var(--transition);
}

.btn-action:hover {
    border-color: var(--primary);
    color: var(--primary);
    transform: translateY(-2px);
}

.share-section {
    background: var(--light);
    padding: 25px;
    border-radius: var(--radius);
}

.share-section p {
    color: var(--dark-light);
    margin-bottom: 15px;
}

.share-buttons {
    display: flex;
    justify-content: center;
    gap: 15px;
}

.share-btn {
    padding: 12px 24px;
    border: none;
    border-radius: var(--radius);
    font-weight: 600;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 8px;
    transition: var(--transition);
}

.share-btn:nth-child(1) {
    background: #1DA1F2;
    color: white;
}

.share-btn:nth-child(2) {
    background: #25D366;
    color: white;
}

.share-btn:nth-child(3) {
    background: var(--dark);
    color: white;
}

.share-btn:hover {
    opacity: 0.9;
    transform: translateY(-2px);
}

/* ===== MODAL ===== */
.modal {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0,0,0,0.8);
    z-index: 2000;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 20px;
}

.modal-content {
    background: white;
    border-radius: var(--radius);
    width: 100%;
    max-width: 800px;
    max-height: 90vh;
    overflow-y: auto;
}

.modal-header {
    padding: 25px 30px;
    border-bottom: 1px solid var(--border);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.modal-header h2 {
    color: var(--dark);
    display: flex;
    align-items: center;
    gap: 12px;
}

.close-btn {
    background: none;
    border: none;
    font-size: 36px;
    color: var(--dark-light);
    cursor: pointer;
    transition: var(--transition);
}

.close-btn:hover {
    color: var(--danger);
}

.modal-body {
    padding: 30px;
}

.review-item {
    padding: 20px;
    border: 1px solid var(--border);
    border-radius: var(--radius);
    margin-bottom: 15px;
}

.review-item.correct {
    background: #E8F5E9;
    border-color: var(--success);
}

.review-item.incorrect {
    background: #FFEBEE;
    border-color: var(--danger);
}

.review-question {
    font-weight: 600;
    margin-bottom: 10px;
    color: var(--dark);
}

.review-answer {
    display: flex;
    justify-content: space-between;
    margin-bottom: 10px;
}

.review-user-answer {
    color: var(--danger);
}

.review-correct-answer {
    color: var(--success);
}

.review-explanation {
    background: white;
    padding: 15px;
    border-radius: var(--radius);
    margin-top: 10px;
    font-size: 14px;
    color: var(--dark-light);
}

/* ===== RESPONSIVE DESIGN ===== */
@media (max-width: 768px) {
    .screen {
        padding: 25px 20px;
    }
    
    .quiz-header {
        flex-direction: column;
        gap: 20px;
        padding: 20px;
    }
    
    .quiz-stats {
        width: 100%;
        justify-content: space-between;
        gap: 10px;
    }
    
    .timer-options {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .stats-grid {
        grid-template-columns: repeat(2, 1fr);
    }
    
    .score-breakdown {
        flex-direction: column;
        gap: 15px;
    }
    
    .results-actions {
        flex-direction: column;
    }
    
    .email-input-group {
        flex-direction: column;
    }
    
    .share-buttons {
        flex-direction: column;
    }
    
    .question-container {
        padding: 25px 20px;
    }
    
    .quiz-controls {
        flex-direction: column;
        gap: 15px;
        padding: 20px;
    }
}

@media (max-width: 480px) {
    .logo h1 {
        font-size: 28px;
    }
    
    .welcome-message h2 {
        font-size: 24px;
    }
    
    .score-circle {
        width: 150px;
        height: 150px;
    }
    
    .score-value {
        font-size: 36px;
    }
    
    .stats-grid {
        grid-template-columns: 1fr;
    }
    
    .stat-card {
        padding: 20px;
    }
}