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

:root {
    --primary-color: #3498db;
    --secondary-color: #2ecc71;
    --accent-color: #e74c3c;
    --dark-bg: #1a1a2e;
    --card-bg: #16213e;
    --text-primary: #ffffff;
    --text-secondary: #b8b8b8;
    --border-color: #0f3460;
    --success-color: #2ecc71;
    --warning-color: #f39c12;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    color: var(--text-primary);
    padding: 20px;
}

.app-container {
    max-width: 1200px;
    margin: 0 auto;
}

/* Header */
.header {
    text-align: center;
    margin-bottom: 30px;
    animation: fadeInDown 0.6s ease;
}

.header h1 {
    font-size: 2.5rem;
    margin-bottom: 10px;
    text-shadow: 2px 2px 4px rgba(0,0,0,0.3);
    color: white;
}

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

/* Progress Bar */
.progress-container {
    background: var(--card-bg);
    border-radius: 10px;
    padding: 15px 20px;
    margin-bottom: 20px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.3);
}

.progress-bar {
    height: 8px;
    background: var(--border-color);
    border-radius: 4px;
    overflow: hidden;
    margin-bottom: 10px;
}

.progress-bar::after {
    content: '';
    display: block;
    height: 100%;
    width: 0%;
    background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
    transition: width 0.5s ease;
    border-radius: 4px;
}

.progress-text {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

/* Navigation */
.module-nav {
    display: flex;
    gap: 10px;
    margin-bottom: 30px;
    flex-wrap: wrap;
}

.nav-btn {
    flex: 1;
    min-width: 120px;
    padding: 15px 25px;
    background: var(--card-bg);
    border: 2px solid var(--border-color);
    border-radius: 8px;
    color: var(--text-primary);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
}

.nav-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(0,0,0,0.3);
    border-color: var(--primary-color);
}

.nav-btn.active {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    border-color: transparent;
    box-shadow: 0 4px 15px rgba(52, 152, 219, 0.4);
}

/* Content Area */
.content-area {
    position: relative;
    min-height: 600px;
}

.module {
    display: none;
    background: var(--card-bg);
    border-radius: 15px;
    padding: 30px;
    box-shadow: 0 8px 16px rgba(0,0,0,0.3);
    animation: fadeIn 0.5s ease;
}

.module.active {
    display: block;
}

.module-header {
    text-align: center;
    margin-bottom: 30px;
    padding-bottom: 20px;
    border-bottom: 2px solid var(--border-color);
}

.module-header h2 {
    font-size: 2rem;
    margin-bottom: 10px;
}

.module-header p {
    color: var(--text-secondary);
    font-size: 1.1rem;
}

/* Lessons */
.lesson {
    display: none;
}

.lesson.active {
    display: block;
    animation: slideIn 0.4s ease;
}

.lesson h3 {
    font-size: 1.5rem;
    margin-bottom: 20px;
    color: var(--primary-color);
}

.lesson-content {
    line-height: 1.8;
}

.lesson-content p {
    margin-bottom: 15px;
    font-size: 1.1rem;
}

.lesson-content ul {
    margin-left: 30px;
    margin-bottom: 20px;
}

.lesson-content li {
    margin-bottom: 10px;
}

/* Code Examples */
.code-example {
    background: #1e1e1e;
    border-radius: 8px;
    padding: 20px;
    margin: 20px 0;
    overflow-x: auto;
    border-left: 4px solid var(--primary-color);
}

.code-example pre {
    margin: 0;
}

.code-example code {
    color: #d4d4d4;
    font-family: 'Courier New', monospace;
    font-size: 0.9rem;
    line-height: 1.6;
}

.lesson-content code {
    background: rgba(255,255,255,0.1);
    padding: 2px 6px;
    border-radius: 4px;
    font-family: 'Courier New', monospace;
    color: var(--primary-color);
}

/* Activities */
.activity {
    background: rgba(52, 152, 219, 0.1);
    border-radius: 10px;
    padding: 25px;
    margin-top: 30px;
    border: 2px solid var(--primary-color);
    transition: all 0.3s ease;
}

.activity.completed {
    background: rgba(46, 204, 113, 0.15);
    border-color: var(--secondary-color);
}

.activity-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 15px;
    margin-bottom: 15px;
}

.activity-header h4 {
    font-size: 1.3rem;
    color: var(--secondary-color);
    margin: 0;
    flex: 1;
    min-width: 200px;
}

.activity-status {
    display: flex;
    align-items: center;
    gap: 15px;
    flex-wrap: wrap;
}

.stage-indicator {
    background: rgba(255, 255, 255, 0.1);
    padding: 8px 15px;
    border-radius: 20px;
    font-size: 0.9rem;
    color: var(--text-secondary);
    border: 1px solid var(--border-color);
}

.stage-number {
    color: var(--primary-color);
    font-weight: bold;
}

.completion-badge {
    padding: 8px 15px;
    border-radius: 20px;
    font-size: 0.9rem;
    font-weight: 600;
    transition: all 0.3s ease;
}

.completion-badge.in-progress {
    background: rgba(243, 156, 18, 0.2);
    color: var(--warning-color);
    border: 1px solid var(--warning-color);
}

.completion-badge.stage-complete {
    background: rgba(52, 152, 219, 0.2);
    color: var(--primary-color);
    border: 1px solid var(--primary-color);
}

.completion-badge.completed {
    background: rgba(46, 204, 113, 0.2);
    color: var(--success-color);
    border: 1px solid var(--success-color);
    animation: pulse 0.5s ease;
}

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

/* Code Editor */
.code-editor {
    margin: 20px 0;
}

.code-editor textarea {
    width: 100%;
    min-height: 200px;
    background: #1e1e1e;
    color: #d4d4d4;
    border: 2px solid var(--border-color);
    border-radius: 8px;
    padding: 15px;
    font-family: 'Courier New', monospace;
    font-size: 0.95rem;
    resize: vertical;
    transition: border-color 0.3s ease;
}

.code-editor textarea:focus {
    outline: none;
    border-color: var(--primary-color);
}

.run-btn, .check-btn {
    background: var(--primary-color);
    color: white;
    border: none;
    padding: 12px 25px;
    border-radius: 6px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    margin-top: 10px;
    transition: all 0.3s ease;
}

.run-btn:hover, .check-btn:hover {
    background: #2980b9;
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(0,0,0,0.3);
}

/* Preview */
.preview {
    background: white;
    border-radius: 8px;
    padding: 20px;
    margin-top: 15px;
    min-height: 150px;
    color: #333;
    box-shadow: inset 0 2px 4px rgba(0,0,0,0.1);
}

/* Feedback */
.feedback {
    margin-top: 15px;
    padding: 15px;
    border-radius: 8px;
    display: none;
}

.feedback.success {
    background: rgba(46, 204, 113, 0.2);
    border: 2px solid var(--success-color);
    color: var(--success-color);
    display: block;
}

.feedback.error {
    background: rgba(231, 76, 60, 0.2);
    border: 2px solid var(--accent-color);
    color: var(--accent-color);
    display: block;
}

/* Lesson Navigation */
.lesson-nav {
    display: flex;
    justify-content: space-between;
    margin-top: 30px;
    padding-top: 20px;
    border-top: 2px solid var(--border-color);
}

.prev-btn, .next-btn {
    background: var(--card-bg);
    color: var(--text-primary);
    border: 2px solid var(--border-color);
    padding: 12px 25px;
    border-radius: 8px;
    font-size: 1rem;
    cursor: pointer;
    transition: all 0.3s ease;
}

.prev-btn:hover, .next-btn:hover {
    background: var(--primary-color);
    border-color: var(--primary-color);
    transform: translateX(5px);
}

.prev-btn:hover {
    transform: translateX(-5px);
}

/* Counter Display */
.counter-display {
    text-align: center;
}

.counter-display p {
    font-size: 2rem;
    margin-bottom: 20px;
    color: var(--primary-color);
    font-weight: bold;
}

.action-btn {
    background: var(--primary-color);
    color: white;
    border: none;
    padding: 12px 25px;
    border-radius: 6px;
    font-size: 1rem;
    cursor: pointer;
    margin: 0 10px;
    transition: all 0.3s ease;
}

.action-btn:hover {
    background: #2980b9;
    transform: scale(1.05);
}

/* Color Buttons */
.color-buttons {
    display: flex;
    gap: 15px;
    justify-content: center;
    flex-wrap: wrap;
}

.color-btn {
    padding: 15px 30px;
    border: none;
    border-radius: 8px;
    color: white;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 4px 6px rgba(0,0,0,0.2);
}

.color-btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 6px 12px rgba(0,0,0,0.3);
}

/* Git Simulator */
.git-simulator {
    margin-top: 20px;
}

.git-commands {
    display: flex;
    gap: 10px;
    margin-bottom: 20px;
}

.git-commands input {
    flex: 1;
    padding: 12px;
    background: #1e1e1e;
    color: #d4d4d4;
    border: 2px solid var(--border-color);
    border-radius: 6px;
    font-family: 'Courier New', monospace;
}

.git-commands button {
    padding: 12px 25px;
    background: var(--primary-color);
    color: white;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    font-weight: 600;
}

.git-output {
    background: #1e1e1e;
    border-radius: 8px;
    padding: 20px;
    min-height: 200px;
    font-family: 'Courier New', monospace;
    color: #00ff00;
    margin-bottom: 15px;
}

.git-prompt {
    color: #00ff00;
    margin-bottom: 10px;
}

.git-status {
    background: rgba(52, 152, 219, 0.1);
    padding: 15px;
    border-radius: 8px;
    border-left: 4px solid var(--primary-color);
}

/* GitHub Simulator */
.github-simulator {
    margin-top: 20px;
}

.repo-creator {
    background: rgba(52, 152, 219, 0.1);
    padding: 25px;
    border-radius: 10px;
    margin-bottom: 20px;
    border: 2px solid var(--primary-color);
}

.repo-creator h4 {
    margin-bottom: 15px;
    color: var(--primary-color);
}

.repo-creator input[type="text"],
.repo-creator textarea {
    width: 100%;
    padding: 12px;
    margin-bottom: 15px;
    background: #1e1e1e;
    color: #d4d4d4;
    border: 2px solid var(--border-color);
    border-radius: 6px;
    font-family: inherit;
}

.repo-creator textarea {
    min-height: 80px;
    resize: vertical;
}

.repo-creator label {
    display: flex;
    align-items: center;
    gap: 10px;
    margin-bottom: 15px;
    cursor: pointer;
}

.repo-creator button {
    background: var(--secondary-color);
    color: white;
    border: none;
    padding: 12px 25px;
    border-radius: 6px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
}

.repo-creator button:hover {
    background: #27ae60;
    transform: translateY(-2px);
}

.repo-list {
    background: #1e1e1e;
    border-radius: 10px;
    padding: 20px;
    min-height: 150px;
}

.repo-item {
    background: var(--card-bg);
    padding: 15px;
    border-radius: 8px;
    margin-bottom: 10px;
    border-left: 4px solid var(--secondary-color);
}

.repo-item h5 {
    color: var(--primary-color);
    margin-bottom: 5px;
}

.repo-item p {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* Modal */
.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0,0,0,0.7);
    z-index: 1000;
    justify-content: center;
    align-items: center;
}

.modal.active {
    display: flex;
}

.modal-content {
    background: var(--card-bg);
    padding: 40px;
    border-radius: 15px;
    text-align: center;
    max-width: 500px;
    box-shadow: 0 8px 32px rgba(0,0,0,0.5);
    animation: scaleIn 0.3s ease;
}

.modal-content h2 {
    font-size: 2rem;
    margin-bottom: 20px;
    color: var(--secondary-color);
}

.modal-content button {
    background: var(--primary-color);
    color: white;
    border: none;
    padding: 12px 30px;
    border-radius: 8px;
    font-size: 1rem;
    cursor: pointer;
    margin-top: 20px;
}

/* Footer */
.footer {
    text-align: center;
    padding: 30px 20px;
    margin-top: 40px;
    color: var(--text-secondary);
    font-size: 1rem;
    opacity: 0.8;
    animation: fadeIn 0.6s ease;
}

.footer p {
    margin: 0;
}

/* Animations */
@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

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

@keyframes slideIn {
    from {
        opacity: 0;
        transform: translateX(-20px);
    }
    to {
        opacity: 1;
        transform: translateX(0);
    }
}

@keyframes scaleIn {
    from {
        transform: scale(0.8);
        opacity: 0;
    }
    to {
        transform: scale(1);
        opacity: 1;
    }
}

/* Language Grid */
.language-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
    margin: 30px 0;
}

.language-card {
    background: rgba(52, 152, 219, 0.1);
    border: 2px solid var(--primary-color);
    border-radius: 10px;
    padding: 20px;
    transition: all 0.3s ease;
}

.language-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 6px 12px rgba(0,0,0,0.3);
    border-color: var(--secondary-color);
}

.language-card h4 {
    color: var(--primary-color);
    margin-bottom: 10px;
    font-size: 1.2rem;
}

.language-card p {
    color: var(--text-secondary);
    margin-bottom: 15px;
    font-size: 0.95rem;
}

.language-card pre {
    background: #1e1e1e;
    padding: 15px;
    border-radius: 6px;
    overflow-x: auto;
    margin: 0;
}

.language-card code {
    color: #d4d4d4;
    font-size: 0.85rem;
}

/* Quiz Styles */
.quiz-container {
    background: rgba(46, 204, 113, 0.1);
    border-radius: 10px;
    padding: 25px;
    margin-top: 20px;
}

.quiz-question h4 {
    color: var(--secondary-color);
    margin-bottom: 20px;
    font-size: 1.2rem;
}

.quiz-options {
    display: grid;
    gap: 10px;
    margin-bottom: 20px;
}

.quiz-option {
    background: var(--card-bg);
    border: 2px solid var(--border-color);
    color: var(--text-primary);
    padding: 15px 20px;
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.3s ease;
    text-align: left;
    font-size: 1rem;
}

.quiz-option:hover {
    background: rgba(52, 152, 219, 0.2);
    border-color: var(--primary-color);
    transform: translateX(5px);
}

.quiz-option.selected {
    background: rgba(52, 152, 219, 0.3);
    border-color: var(--primary-color);
    box-shadow: 0 0 10px rgba(52, 152, 219, 0.5);
}

.quiz-feedback {
    margin-top: 15px;
    padding: 15px;
    border-radius: 8px;
    font-weight: 600;
    display: none;
}

.quiz-feedback.success {
    background: rgba(46, 204, 113, 0.2);
    border: 2px solid var(--success-color);
    color: var(--success-color);
    display: block;
}

.quiz-feedback.error {
    background: rgba(231, 76, 60, 0.2);
    border: 2px solid var(--accent-color);
    color: var(--accent-color);
    display: block;
}

.quiz-score {
    margin-top: 20px;
    padding: 15px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 8px;
    text-align: center;
    font-size: 1.1rem;
    font-weight: 600;
}

.quiz-results {
    text-align: center;
    padding: 30px;
}

.quiz-results h3 {
    font-size: 2rem;
    color: var(--secondary-color);
    margin-bottom: 20px;
}

.quiz-results p {
    font-size: 1.2rem;
    margin-bottom: 15px;
}

/* PHP Form Simulator */
.php-form-simulator {
    background: white;
    padding: 20px;
    border-radius: 8px;
    color: #333;
}

.php-form-simulator h4 {
    color: #777;
    margin-bottom: 15px;
}

.php-form-simulator input {
    width: 100%;
    padding: 10px;
    margin-bottom: 10px;
    border: 1px solid #ddd;
    border-radius: 4px;
}

.php-form-simulator button {
    background: #3498db;
    color: white;
    border: none;
    padding: 10px 20px;
    border-radius: 4px;
    cursor: pointer;
}

/* Route Tester */
.route-tester {
    background: white;
    padding: 20px;
    border-radius: 8px;
    color: #333;
}

.route-tester h4 {
    color: #777;
    margin-bottom: 15px;
}

.route-item {
    background: #f8f9fa;
    padding: 10px;
    margin-bottom: 10px;
    border-radius: 6px;
    display: flex;
    align-items: center;
    gap: 10px;
}

.route-item code {
    background: #e9ecef;
    padding: 4px 8px;
    border-radius: 4px;
    color: #e83e8c;
}

/* API Tester */
.api-tester {
    background: white;
    padding: 20px;
    border-radius: 8px;
    color: #333;
}

.api-tester h4 {
    color: #777;
    margin-bottom: 15px;
}

.api-output {
    margin-top: 20px;
    min-height: 100px;
}

/* Page Navigation */
.page-nav {
    margin-top: 20px;
}

.nav-link {
    display: inline-block;
    padding: 10px 20px;
    background: rgba(255, 255, 255, 0.1);
    color: var(--text-primary);
    text-decoration: none;
    border-radius: 6px;
    border: 2px solid var(--border-color);
    transition: all 0.3s ease;
}

.nav-link:hover {
    background: var(--primary-color);
    border-color: var(--primary-color);
    transform: translateX(-5px);
}

/* MVC Components */
.mvc-explanation {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
    margin: 30px 0;
}

.mvc-card {
    padding: 20px;
    border-radius: 10px;
    text-align: center;
    transition: all 0.3s ease;
}

.mvc-card.model {
    background: rgba(231, 76, 60, 0.2);
    border: 2px solid #e74c3c;
}

.mvc-card.view {
    background: rgba(46, 204, 113, 0.2);
    border: 2px solid #2ecc71;
}

.mvc-card.controller {
    background: rgba(52, 152, 219, 0.2);
    border: 2px solid #3498db;
}

.mvc-card h4 {
    font-size: 1.3rem;
    margin-bottom: 10px;
}

.mvc-card.model h4 {
    color: #e74c3c;
}

.mvc-card.view h4 {
    color: #2ecc71;
}

.mvc-card.controller h4 {
    color: #3498db;
}

.mvc-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 6px 12px rgba(0,0,0,0.3);
}

/* MVC Builder */
.mvc-builder {
    margin-top: 20px;
}

.mvc-tabs {
    display: flex;
    gap: 10px;
    margin-bottom: 20px;
    flex-wrap: wrap;
}

.mvc-tab {
    padding: 12px 20px;
    background: var(--card-bg);
    border: 2px solid var(--border-color);
    color: var(--text-primary);
    border-radius: 8px;
    cursor: pointer;
    transition: all 0.3s ease;
    font-weight: 600;
}

.mvc-tab:hover {
    background: rgba(52, 152, 219, 0.2);
    border-color: var(--primary-color);
}

.mvc-tab.active {
    background: var(--primary-color);
    border-color: var(--primary-color);
    box-shadow: 0 4px 8px rgba(52, 152, 219, 0.4);
}

.mvc-tab-content {
    display: none;
}

.mvc-tab-content.active {
    display: block;
    animation: fadeIn 0.3s ease;
}

.mvc-tab-content h4 {
    color: var(--primary-color);
    margin-bottom: 15px;
}

.mvc-feedback {
    margin-top: 15px;
    min-height: 50px;
}

.mvc-preview {
    margin-top: 30px;
    padding: 25px;
    background: rgba(46, 204, 113, 0.1);
    border: 2px solid var(--secondary-color);
    border-radius: 10px;
}

.mvc-preview h4 {
    color: var(--secondary-color);
    margin-bottom: 15px;
}

.mvc-preview-controls {
    display: flex;
    gap: 10px;
    margin-bottom: 20px;
    flex-wrap: wrap;
}

.mvc-preview-output {
    background: white;
    padding: 20px;
    border-radius: 8px;
    min-height: 200px;
    color: #333;
}

/* Responsive Design */
@media (max-width: 768px) {
    .header h1 {
        font-size: 1.8rem;
    }
    
    .module {
        padding: 20px;
    }
    
    .module-nav {
        flex-direction: column;
    }
    
    .nav-btn {
        width: 100%;
    }
    
    .code-editor textarea {
        font-size: 0.85rem;
    }
    
    .language-grid {
        grid-template-columns: 1fr;
    }
    
    .activity-header {
        flex-direction: column;
        align-items: flex-start;
    }
}