/* ====================================
   ExamLite - Global Styles
   ==================================== */

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

:root {
    --primary-color: #2563eb;
    --primary-dark: #1e40af;
    --secondary-color: #64748b;
    --success-color: #10b981;
    --danger-color: #ef4444;
    --warning-color: #f59e0b;
    --light-bg: #f8fafc;
    --border-color: #e2e8f0;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);
}

html {
    font-size: 16px;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--light-bg);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

/* ====================================
   Container & Layout
   ==================================== */

.container {
    max-width: 600px;
    margin: 0 auto;
    padding: 20px;
}

.exam-container {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    background-color: #fff;
}

/* ====================================
   Header Styles
   ==================================== */

.header {
    text-align: center;
    margin-bottom: 30px;
}

.header h1 {
    font-size: 2.5rem;
    color: var(--primary-color);
    margin-bottom: 5px;
    font-weight: 700;
}

.header .tagline {
    color: var(--text-secondary);
    font-size: 1rem;
    font-weight: 500;
}

/* ====================================
   Registration Card
   ==================================== */

.registration-card {
    background: white;
    border-radius: 12px;
    padding: 40px;
    box-shadow: var(--shadow-lg);
    margin-top: 20px;
}

.registration-form {
    display: flex;
    flex-direction: column;
    gap: 20px;
}

.form-group {
    display: flex;
    flex-direction: column;
}

.form-group label {
    font-weight: 600;
    margin-bottom: 8px;
    color: var(--text-primary);
    font-size: 0.95rem;
}

.form-group input,
.form-group select {
    padding: 12px 15px;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    font-size: 1rem;
    font-family: inherit;
    transition: all 0.3s ease;
    background-color: white;
}

.form-group input:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
}

.form-group input::placeholder {
    color: var(--text-secondary);
}

.error {
    color: var(--danger-color);
    font-size: 0.875rem;
    margin-top: 5px;
    min-height: 20px;
}

#generalError {
    padding: 10px;
    border-radius: 6px;
    background-color: #fee2e2;
    white-space: pre-wrap;
}

.info-text {
    font-size: 0.85rem;
    color: var(--text-secondary);
    background-color: var(--light-bg);
    padding: 12px;
    border-radius: 6px;
    border-left: 4px solid var(--warning-color);
    margin-top: 10px;
}

/* ====================================
   Button Styles
   ==================================== */

.btn {
    padding: 12px 24px;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    text-decoration: none;
    display: inline-block;
    text-align: center;
    font-family: inherit;
}

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

.btn-primary {
    background-color: var(--primary-color);
    color: white;
    width: 100%;
    margin-top: 10px;
}

.btn-primary:hover:not(:disabled) {
    background-color: var(--primary-dark);
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg);
}

.btn-secondary {
    background-color: var(--secondary-color);
    color: white;
}

.btn-secondary:hover:not(:disabled) {
    background-color: #475569;
    transform: translateY(-2px);
}

.btn-danger {
    background-color: var(--danger-color);
    color: white;
}

.btn-danger:hover:not(:disabled) {
    background-color: #dc2626;
    transform: translateY(-2px);
}

/* ====================================
   Exam Header
   ==================================== */

.exam-header {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    color: white;
    padding: 20px;
    box-shadow: var(--shadow);
}

.exam-title {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 15px;
}

.exam-info {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 20px;
}

.timer-section {
    display: flex;
    flex-direction: column;
    align-items: center;
}

.timer-label {
    font-size: 0.9rem;
    opacity: 0.9;
    margin-bottom: 5px;
}

.timer {
    font-size: 1.8rem;
    font-weight: 700;
    font-family: 'Courier New', monospace;
    letter-spacing: 2px;
    transition: all 0.3s ease;
}

.timer.timer-warning {
    color: var(--warning-color);
    animation: pulse-warning 1s infinite;
}

.timer.timer-critical {
    color: var(--danger-color);
    animation: pulse-critical 0.5s infinite;
}

@keyframes pulse-warning {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.7; }
}

@keyframes pulse-critical {
    0%, 100% { opacity: 1; transform: scale(1); }
    50% { opacity: 0.5; transform: scale(1.05); }
}

.progress-section {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.progress-bar {
    width: 100%;
    height: 6px;
    background-color: rgba(255, 255, 255, 0.3);
    border-radius: 10px;
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    background-color: var(--success-color);
    transition: width 0.3s ease;
}

/* ====================================
   Exam Content
   ==================================== */

.exam-content {
    flex: 1;
    padding: 40px 20px;
    overflow-y: auto;
}

.question-container {
    max-width: 800px;
    margin: 0 auto;
}

.question-number {
    font-size: 0.9rem;
    color: var(--text-secondary);
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    margin-bottom: 10px;
}

.question-text {
    font-size: 1.3rem;
    font-weight: 600;
    color: var(--text-primary);
    margin-bottom: 30px;
    line-height: 1.6;
}

/* ====================================
   Options Styles
   ==================================== */

.options-container {
    display: flex;
    flex-direction: column;
    gap: 15px;
    margin-bottom: 30px;
}

.option-label {
    display: flex;
    align-items: center;
    padding: 16px;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    background-color: white;
    cursor: pointer;
    transition: all 0.3s ease;
    position: relative;
}

.option-label:hover {
    border-color: var(--primary-color);
    background-color: var(--light-bg);
}

.option-label.selected {
    border-color: var(--primary-color);
    background-color: rgba(37, 99, 235, 0.05);
}

.option-label input[type="radio"] {
    width: 20px;
    height: 20px;
    margin-right: 15px;
    cursor: pointer;
    accent-color: var(--primary-color);
}

.option-text {
    font-size: 1rem;
    color: var(--text-primary);
}

.error-message {
    color: var(--danger-color);
    font-size: 0.9rem;
    padding: 10px;
    background-color: #fee2e2;
    border-radius: 6px;
    margin-top: 10px;
    min-height: 20px;
}

/* ====================================
   Exam Footer
   ==================================== */

.exam-footer {
    background-color: #f8fafc;
    border-top: 1px solid var(--border-color);
    padding: 20px;
    display: flex;
    gap: 15px;
    justify-content: center;
    flex-wrap: wrap;
}

.exam-footer .btn {
    min-width: 120px;
}

/* ====================================
   Result Card
   ==================================== */

.result-card {
    background: white;
    border-radius: 12px;
    padding: 40px;
    box-shadow: var(--shadow-lg);
    margin-top: 20px;
    text-align: center;
}

.result-header {
    margin-bottom: 30px;
}

.result-icon {
    font-size: 4rem;
    margin-bottom: 15px;
}

.success-icon {
    color: var(--success-color);
}

.result-header h1 {
    font-size: 2rem;
    color: var(--text-primary);
    margin-bottom: 10px;
}

.result-body {
    margin-bottom: 30px;
}

.score-display {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
    color: white;
    padding: 40px;
    border-radius: 12px;
    margin-bottom: 30px;
}

.score-value {
    font-size: 3.5rem;
    font-weight: 700;
    margin-bottom: 10px;
}

.score-label {
    font-size: 1.2rem;
    opacity: 0.9;
}

.result-message {
    background-color: var(--light-bg);
    padding: 20px;
    border-radius: 8px;
    margin-bottom: 20px;
}

.result-message p {
    font-size: 1.1rem;
    color: var(--text-primary);
    font-weight: 500;
}

.score-breakdown {
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.breakdown-item {
    display: flex;
    justify-content: space-between;
    padding: 12px;
    background-color: var(--light-bg);
    border-radius: 6px;
}

.breakdown-label {
    font-weight: 600;
    color: var(--text-secondary);
}

.breakdown-value {
    font-weight: 700;
    color: var(--text-primary);
}

.score-highlight {
    color: var(--primary-color);
}

.result-footer {
    border-top: 1px solid var(--border-color);
    padding-top: 30px;
}

.footer-text {
    color: var(--text-secondary);
    margin-bottom: 20px;
    font-size: 0.95rem;
}

/* ====================================
   Error Card
   ==================================== */

.error-card {
    background: white;
    border-radius: 12px;
    padding: 40px;
    box-shadow: var(--shadow-lg);
    margin-top: 20px;
    text-align: center;
}

.error-icon {
    font-size: 4rem;
    margin-bottom: 20px;
}

.error-card h1 {
    font-size: 2rem;
    color: var(--text-primary);
    margin-bottom: 10px;
}

.error-message {
    color: var(--text-secondary);
    font-size: 1rem;
    margin-bottom: 30px;
    line-height: 1.6;
}

/* ====================================
   Responsive Design
   ==================================== */

@media (max-width: 768px) {
    .header h1 {
        font-size: 2rem;
    }
    
    .registration-card {
        padding: 25px;
    }
    
    .exam-info {
        grid-template-columns: 1fr;
        gap: 15px;
    }
    
    .exam-content {
        padding: 20px 15px;
    }
    
    .question-text {
        font-size: 1.1rem;
    }
    
    .exam-footer {
        flex-direction: column;
    }
    
    .exam-footer .btn {
        width: 100%;
    }
    
    .score-display {
        padding: 30px;
    }
    
    .score-value {
        font-size: 2.5rem;
    }
    
    .timer {
        font-size: 1.5rem;
    }
}

@media (max-width: 480px) {
    .container {
        padding: 10px;
    }
    
    .header h1 {
        font-size: 1.5rem;
    }
    
    .registration-card {
        padding: 20px;
        border-radius: 8px;
    }
    
    .form-group input,
    .form-group select {
        font-size: 16px; /* Prevents zoom on iOS */
    }
    
    .exam-header {
        padding: 15px;
    }
    
    .exam-title {
        font-size: 1.2rem;
    }
    
    .timer {
        font-size: 1.3rem;
    }
    
    .option-label {
        padding: 12px;
    }
    
    .option-label input[type="radio"] {
        width: 18px;
        height: 18px;
    }
    
    .option-text {
        font-size: 0.95rem;
    }
    
    .result-card {
        padding: 20px;
    }
    
    .score-value {
        font-size: 2rem;
    }
    
    .breakdown-item {
        flex-direction: column;
        align-items: flex-start;
        gap: 5px;
    }
}

/* ====================================
   Print Styles
   ==================================== */

@media print {
    body {
        background-color: white;
    }
    
    .btn {
        display: none;
    }
    
    .exam-footer {
        display: none;
    }
}