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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: #333;
    background-color: #f4f4f4;
}

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

/* Header Styles */
header {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    padding: 2rem 0;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

header h1 {
    font-size: 2.5rem;
    margin-bottom: 0.5rem;
}

.tagline {
    font-size: 1.1rem;
    opacity: 0.9;
}

/* Main Content */
main {
    padding: 2rem 0;
    min-height: calc(100vh - 200px);
}

.intro {
    text-align: center;
    margin-bottom: 3rem;
    padding: 2rem;
    background: white;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

.intro h2 {
    color: #667eea;
    margin-bottom: 1rem;
    font-size: 2rem;
}

.year-levels h2 {
    text-align: center;
    margin-bottom: 2rem;
    color: #333;
    font-size: 1.8rem;
}

/* Year Grid */
.year-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 2rem;
    margin-bottom: 2rem;
}

.year-card {
    background: white;
    padding: 2rem;
    border-radius: 10px;
    text-decoration: none;
    color: #333;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    display: flex;
    flex-direction: column;
    align-items: center;
    text-align: center;
}

.year-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 5px 20px rgba(0,0,0,0.2);
}

.year-card.junior {
    border-top: 4px solid #4CAF50;
}

.year-card.senior {
    border-top: 4px solid #2196F3;
}

.year-card h3 {
    font-size: 2rem;
    margin-bottom: 0.5rem;
    color: #667eea;
}

.year-card p {
    font-size: 1.1rem;
    margin-bottom: 1rem;
    color: #666;
}

.level-type {
    display: inline-block;
    padding: 0.3rem 1rem;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 600;
    text-transform: uppercase;
}

.year-card.junior .level-type {
    background-color: #e8f5e9;
    color: #2e7d32;
}

.year-card.senior .level-type {
    background-color: #e3f2fd;
    color: #1565c0;
}

/* Strand/Standard Cards */
.strands-grid, .standards-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.strand-card, .standard-card {
    background: white;
    padding: 1.5rem;
    border-radius: 8px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
    transition: transform 0.2s ease;
}

.strand-card:hover, .standard-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 4px 12px rgba(0,0,0,0.15);
}

.strand-card h3, .standard-card h3 {
    color: #667eea;
    margin-bottom: 0.5rem;
    font-size: 1.3rem;
}

.strand-card p, .standard-card p {
    color: #666;
    font-size: 0.95rem;
    line-height: 1.5;
}

.standard-code {
    display: inline-block;
    background-color: #f0f0f0;
    padding: 0.2rem 0.6rem;
    border-radius: 4px;
    font-family: 'Courier New', monospace;
    font-size: 0.9rem;
    margin-bottom: 0.5rem;
    color: #764ba2;
    font-weight: 600;
}

/* Navigation */
.nav-back {
    display: inline-block;
    margin-bottom: 2rem;
    padding: 0.8rem 1.5rem;
    background-color: #667eea;
    color: white;
    text-decoration: none;
    border-radius: 5px;
    transition: background-color 0.3s ease;
}

.nav-back:hover {
    background-color: #764ba2;
}

/* Footer */
footer {
    background-color: #333;
    color: white;
    text-align: center;
    padding: 1.5rem 0;
    margin-top: 3rem;
}

/* Responsive Design */
@media (max-width: 768px) {
    header h1 {
        font-size: 2rem;
    }
    
    .year-grid {
        grid-template-columns: 1fr;
    }
    
    .strands-grid, .standards-grid {
        grid-template-columns: 1fr;
    }
}