/* Arduino UNO R4 WiFi Journey - Interactive Styles */

:root {
    --primary-color: #00a8cc;
    --secondary-color: #ff6b35;
    --accent-color: #f39c12;
    --bg-color: #1a1a1a;
    --card-bg: #2d2d2d;
    --text-color: #ffffff;
    --text-muted: #cccccc;
    --success-color: #27ae60;
    --warning-color: #f39c12;
    --danger-color: #e74c3c;
    --border-radius: 10px;
    --box-shadow: 0 4px 15px rgba(0, 0, 0, 0.3);
    --transition: all 0.3s ease;
}

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

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

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}

/* Hero Section */
.hero-section {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    padding: 80px 0;
    text-align: center;
    position: relative;
    overflow: hidden;
}

.hero-section::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><circle cx="50" cy="50" r="2" fill="rgba(255,255,255,0.1)"/></svg>') repeat;
    animation: float 20s infinite linear;
}

@keyframes float {
    0% { transform: translateY(0) rotate(0deg); }
    100% { transform: translateY(-100px) rotate(360deg); }
}

.hero-title {
    font-size: 3.5rem;
    font-weight: 700;
    margin-bottom: 20px;
    position: relative;
    z-index: 1;
}

.hero-title i {
    color: var(--accent-color);
    margin-right: 15px;
}

.hero-subtitle {
    font-size: 1.4rem;
    margin-bottom: 40px;
    opacity: 0.9;
    position: relative;
    z-index: 1;
}

.hero-stats {
    display: flex;
    justify-content: center;
    gap: 40px;
    position: relative;
    z-index: 1;
}

.stat {
    text-align: center;
}

.stat-number {
    display: block;
    font-size: 2.5rem;
    font-weight: 700;
    color: var(--accent-color);
}

.stat-label {
    font-size: 1rem;
    opacity: 0.8;
}

/* Progress Navigation */
.progress-nav {
    background-color: var(--card-bg);
    padding: 20px 0;
    border-bottom: 2px solid var(--primary-color);
    position: sticky;
    top: 0;
    z-index: 100;
}

.progress-bar {
    height: 6px;
    background-color: rgba(255, 255, 255, 0.1);
    border-radius: 3px;
    margin-bottom: 15px;
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--primary-color), var(--accent-color));
    width: 20%;
    transition: width 0.5s ease;
}

.module-indicators {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.module-indicator {
    display: flex;
    flex-direction: column;
    align-items: center;
    cursor: pointer;
    transition: var(--transition);
    padding: 10px;
    border-radius: var(--border-radius);
}

.module-indicator:hover {
    background-color: rgba(255, 255, 255, 0.1);
}

.module-indicator.active {
    color: var(--primary-color);
}

.module-indicator i {
    font-size: 1.5rem;
    margin-bottom: 5px;
}

.module-indicator span {
    font-size: 0.8rem;
    font-weight: 500;
}

/* Main Content */
.main-content {
    padding: 60px 0;
}

.main-content section {
    margin-bottom: 80px;
}

.main-content h2 {
    font-size: 2.5rem;
    margin-bottom: 30px;
    text-align: center;
    color: var(--primary-color);
}

.main-content h2 i {
    margin-right: 15px;
    color: var(--accent-color);
}

/* Quick Start Section */
.path-selector {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
    margin-top: 30px;
}

.path-card {
    background-color: var(--card-bg);
    padding: 30px;
    border-radius: var(--border-radius);
    text-align: center;
    cursor: pointer;
    transition: var(--transition);
    border: 2px solid transparent;
    position: relative;
    overflow: hidden;
}

.path-card::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(0, 168, 204, 0.1), transparent);
    transition: left 0.5s ease;
}

.path-card:hover::before {
    left: 100%;
}

.path-card:hover {
    transform: translateY(-5px);
    border-color: var(--primary-color);
    box-shadow: var(--box-shadow);
}

.path-card i {
    font-size: 3rem;
    color: var(--primary-color);
    margin-bottom: 20px;
}

.path-card h3 {
    font-size: 1.5rem;
    margin-bottom: 15px;
    color: var(--text-color);
}

.path-card p {
    color: var(--text-muted);
    margin-bottom: 20px;
}

.duration {
    display: inline-block;
    background-color: var(--accent-color);
    color: var(--bg-color);
    padding: 5px 15px;
    border-radius: 20px;
    font-size: 0.9rem;
    font-weight: 600;
}

/* Learning Modules */
.modules-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
    gap: 30px;
    margin-top: 30px;
}

.module-card {
    background-color: var(--card-bg);
    border-radius: var(--border-radius);
    padding: 30px;
    transition: var(--transition);
    border: 2px solid transparent;
    position: relative;
}

.module-card:hover {
    transform: translateY(-5px);
    border-color: var(--primary-color);
    box-shadow: var(--box-shadow);
}

.module-header {
    display: flex;
    align-items: center;
    margin-bottom: 20px;
    gap: 15px;
}

.module-header i {
    font-size: 2rem;
    color: var(--primary-color);
}

.module-header h3 {
    flex: 1;
    font-size: 1.4rem;
}

.difficulty {
    padding: 4px 12px;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 600;
    text-transform: uppercase;
}

.difficulty.beginner {
    background-color: var(--success-color);
    color: white;
}

.difficulty.intermediate {
    background-color: var(--warning-color);
    color: white;
}

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

.module-card p {
    color: var(--text-muted);
    margin-bottom: 20px;
    line-height: 1.6;
}

.module-features {
    display: flex;
    flex-wrap: wrap;
    gap: 10px;
    margin-bottom: 25px;
}

.feature {
    display: flex;
    align-items: center;
    background-color: rgba(0, 168, 204, 0.1);
    padding: 5px 12px;
    border-radius: 15px;
    font-size: 0.85rem;
    color: var(--primary-color);
    border: 1px solid rgba(0, 168, 204, 0.2);
}

.feature i {
    margin-right: 8px;
    font-size: 0.8rem;
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 12px 24px;
    border-radius: var(--border-radius);
    text-decoration: none;
    font-weight: 600;
    text-align: center;
    transition: var(--transition);
    border: none;
    cursor: pointer;
    font-size: 1rem;
}

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

.btn-primary:hover {
    background-color: #0092b3;
    transform: translateY(-2px);
}

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

.btn-secondary:hover {
    background-color: #e55a2b;
    transform: translateY(-2px);
}

.btn-outline {
    background-color: transparent;
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
}

.btn-outline:hover {
    background-color: var(--primary-color);
    color: white;
}

/* Interactive Tools */
.tools-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 25px;
    margin-top: 30px;
}

.tool-card {
    background-color: var(--card-bg);
    padding: 25px;
    border-radius: var(--border-radius);
    text-align: center;
    cursor: pointer;
    transition: var(--transition);
    border: 2px solid transparent;
}

.tool-card:hover {
    transform: translateY(-5px);
    border-color: var(--accent-color);
    box-shadow: var(--box-shadow);
}

.tool-card i {
    font-size: 2.5rem;
    color: var(--accent-color);
    margin-bottom: 15px;
}

.tool-card h3 {
    margin-bottom: 10px;
    color: var(--text-color);
}

.tool-card p {
    color: var(--text-muted);
    font-size: 0.9rem;
}

/* Safety Notice */
.safety-notice {
    background: linear-gradient(135deg, var(--danger-color), #c0392b);
    border-radius: var(--border-radius);
    padding: 30px;
    margin-top: 40px;
}

.notice-content {
    display: flex;
    align-items: center;
    gap: 20px;
}

.notice-content i {
    font-size: 2.5rem;
    color: var(--accent-color);
    flex-shrink: 0;
}

.notice-content h3 {
    margin-bottom: 10px;
    font-size: 1.3rem;
}

.notice-content p {
    opacity: 0.9;
    line-height: 1.5;
}

/* Footer */
.site-footer {
    background-color: #111;
    padding: 50px 0 20px;
    border-top: 2px solid var(--primary-color);
}

.footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 40px;
    margin-bottom: 30px;
}

.footer-section h4 {
    color: var(--primary-color);
    margin-bottom: 20px;
    font-size: 1.2rem;
}

.footer-section ul {
    list-style: none;
}

.footer-section ul li {
    margin-bottom: 8px;
}

.footer-section ul li a {
    color: var(--text-muted);
    text-decoration: none;
    transition: var(--transition);
}

.footer-section ul li a:hover {
    color: var(--primary-color);
}

.footer-bottom {
    border-top: 1px solid #333;
    padding-top: 20px;
    text-align: center;
    color: var(--text-muted);
    font-size: 0.9rem;
}

/* Responsive Design */
@media (max-width: 768px) {
    .container {
        padding: 0 15px;
    }
    
    .hero-title {
        font-size: 2.5rem;
    }
    
    .hero-subtitle {
        font-size: 1.2rem;
    }
    
    .hero-stats {
        flex-direction: column;
        gap: 20px;
    }
    
    .module-indicators {
        flex-wrap: wrap;
        justify-content: center;
        gap: 10px;
    }
    
    .modules-grid,
    .tools-grid,
    .path-selector {
        grid-template-columns: 1fr;
    }
    
    .notice-content {
        flex-direction: column;
        text-align: center;
    }
    
    .main-content h2 {
        font-size: 2rem;
    }
}

@media (max-width: 480px) {
    .hero-title {
        font-size: 2rem;
    }
    
    .main-content {
        padding: 40px 0;
    }
    
    .main-content section {
        margin-bottom: 50px;
    }
    
    .module-card,
    .path-card,
    .tool-card {
        padding: 20px;
    }
}

/* Animation Classes */
.fade-in {
    animation: fadeIn 0.6s ease-in;
}

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

.slide-in {
    animation: slideIn 0.8s ease-out;
}

@keyframes slideIn {
    from { transform: translateX(-50px); opacity: 0; }
    to { transform: translateX(0); opacity: 1; }
}

/* Loading States */
.loading {
    position: relative;
    pointer-events: none;
}

.loading::after {
    content: '';
    position: absolute;
    top: 50%;
    left: 50%;
    width: 20px;
    height: 20px;
    border: 2px solid var(--primary-color);
    border-top: 2px solid transparent;
    border-radius: 50%;
    animation: spin 1s linear infinite;
    transform: translate(-50%, -50%);
}

@keyframes spin {
    0% { transform: translate(-50%, -50%) rotate(0deg); }
    100% { transform: translate(-50%, -50%) rotate(360deg); }
}