/* CSS Variables for theming */
:root {
    --primary: #FFDF00;
    --secondary: #004040;
    --accent: #FF6B6B;
    --bg: #F8F9FA;
    --text: #2C3E50;
    --white: #FFFFFF;
    --shadow: rgba(0, 0, 0, 0.1);
    --border-radius: 12px;
    --transition: all 0.3s ease;
    --font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

/* Reset and base styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: var(--font-family);
    line-height: 1.6;
    color: var(--text);
    background-color: var(--bg);
    overflow-x: hidden;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
    font-weight: 700;
    margin-bottom: 1rem;
    color: var(--text);
}

h1 { font-size: clamp(1.8rem, 4vw, 2.5rem); }
h2 { font-size: clamp(1.5rem, 3vw, 2rem); }
h3 { font-size: clamp(1.2rem, 2.5vw, 1.5rem); }

p {
    margin-bottom: 1rem;
    font-size: clamp(1rem, 2vw, 1.1rem);
}

/* Container and layout */
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1rem;
}

/* Header and Navigation */
header {
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: var(--white);
    padding: 1rem 0;
    position: sticky;
    top: 0;
    z-index: 100;
    box-shadow: 0 2px 10px var(--shadow);
}

.nav-container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 1rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
}

.logo-container {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.logo {
    height: 40px;
    width: auto;
    border-radius: 50%;
}

.nav-menu {
    display: flex;
    list-style: none;
    gap: 2rem;
    margin: 0;
    padding: 0;
}

.nav-menu a {
    color: var(--white);
    text-decoration: none;
    font-weight: 500;
    padding: 0.5rem 1rem;
    border-radius: var(--border-radius);
    transition: var(--transition);
    font-size: 1.1rem;
}

.nav-menu a:hover,
.nav-menu a:focus {
    background-color: rgba(255, 255, 255, 0.2);
    outline: 2px solid var(--white);
    outline-offset: 2px;
}

/* Hero Section */
.hero-section {
    background: linear-gradient(135deg, var(--secondary), var(--primary));
    color: var(--white);
    padding: 4rem 1rem;
    text-align: center;
    min-height: 70vh;
    display: flex;
    align-items: center;
    justify-content: center;
}

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

.hero-slogan {
    font-size: clamp(1.1rem, 2.5vw, 1.3rem);
    margin-bottom: 2rem;
    opacity: 0.9;
}

/* Countdown Timer */
.countdown-container {
    margin-top: 2rem;
}

.countdown-timer {
    display: flex;
    justify-content: center;
    gap: 1rem;
    flex-wrap: wrap;
    margin-top: 1rem;
}

.countdown-item {
    background: rgba(255, 255, 255, 0.1);
    border-radius: var(--border-radius);
    padding: 1rem;
    min-width: 80px;
    text-align: center;
    backdrop-filter: blur(10px);
}

.countdown-item span {
    display: block;
    font-size: 2rem;
    font-weight: bold;
    color: var(--primary);
}

.countdown-item label {
    font-size: 0.9rem;
    color: var(--white);
    text-transform: uppercase;
    letter-spacing: 1px;
}

/* Games Section */
.games-section {
    padding: 4rem 1rem;
    background-color: var(--white);
}

.games-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-top: 2rem;
}

.game-card {
    background: var(--white);
    border-radius: var(--border-radius);
    padding: 1.5rem;
    box-shadow: 0 4px 20px var(--shadow);
    transition: var(--transition);
    border: 2px solid transparent;
    cursor: pointer;
}

.game-card:hover,
.game-card:focus {
    transform: translateY(-5px);
    box-shadow: 0 8px 30px rgba(0, 0, 0, 0.15);
    border-color: var(--primary);
}

.game-card img {
    width: 100%;
    height: 200px;
    object-fit: cover;
    border-radius: var(--border-radius);
    margin-bottom: 1rem;
}

.game-card h3 {
    color: var(--secondary);
    margin-bottom: 0.5rem;
}

.game-card p {
    color: var(--text);
    margin-bottom: 1rem;
    font-size: 0.95rem;
}

.difficulty-badge {
    display: inline-block;
    background-color: var(--accent);
    color: var(--white);
    padding: 0.25rem 0.75rem;
    border-radius: 20px;
    font-size: 0.8rem;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

/* About Section */
.about-section {
    padding: 4rem 1rem;
    background-color: var(--bg);
    text-align: center;
}

/* Footer */
footer {
    background-color: var(--secondary);
    color: var(--white);
    padding: 3rem 1rem 1rem;
}

.footer-content {
    max-width: 1200px;
    margin: 0 auto;
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    text-align: center;
}

.footer-section h3 {
    color: var(--primary);
    margin-bottom: 1rem;
}

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

.footer-section a:hover,
.footer-section a:focus {
    color: var(--primary);
    outline: 2px solid var(--primary);
    outline-offset: 2px;
    border-radius: 4px;
}

.social-links {
    display: flex;
    justify-content: center;
    gap: 1rem;
    flex-wrap: wrap;
}

.social-link {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    background-color: var(--primary);
    color: var(--secondary);
    border-radius: 50%;
    text-decoration: none;
    font-weight: bold;
    transition: var(--transition);
}

.social-link:hover,
.social-link:focus {
    transform: scale(1.1);
    box-shadow: 0 4px 15px rgba(255, 223, 0, 0.3);
}

/* Responsive Design */
@media (max-width: 768px) {
    .nav-container {
        flex-direction: column;
        gap: 1rem;
    }
    
    .nav-menu {
        gap: 1rem;
    }
    
    .countdown-timer {
        gap: 0.5rem;
    }
    
    .countdown-item {
        min-width: 60px;
        padding: 0.75rem;
    }
    
    .countdown-item span {
        font-size: 1.5rem;
    }
    
    .games-grid {
        grid-template-columns: 1fr;
    }
}

@media (max-width: 480px) {
    .hero-section {
        padding: 2rem 1rem;
    }
    
    .countdown-timer {
        flex-direction: column;
        align-items: center;
    }
    
    .countdown-item {
        width: 100%;
        max-width: 200px;
    }
}

/* Focus and accessibility */
*:focus {
    outline: 2px solid var(--primary);
    outline-offset: 2px;
}

/* Animation for loading states */
@keyframes pulse {
    0% { opacity: 0.6; }
    50% { opacity: 1; }
    100% { opacity: 0.6; }
}

.loading {
    animation: pulse 1.5s ease-in-out infinite;
}

/* TODO: Student exercise - Add hover animations for cards */
/* TODO: Student exercise - Add dark mode toggle */
/* TODO: Student exercise - Add custom scrollbar styles */