:root { 
    --primary: #ff0f0f; 
    --accent: #ffb300;  
    --bg: #fff5f8;      
    --text: #4a4a4a;
}

body { 
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif; 
    margin: 0; 
    background: var(--bg); 
    line-height: 1.6; 
    color: var(--text); 
}

header { 
    background: var(--primary); 
    color: white; 
    text-align: center; 
    padding: 40px 20px; 
    border-bottom: 5px solid var(--accent);
}

header h1 {
    text-transform: uppercase;
    letter-spacing: 2px;
    margin: 0;
    text-shadow: 2px 2px 4px rgba(0,0,0,0.3);
}

header p {
    color: var(--accent);
    font-size: 1.2rem;
    font-weight: bold;
}

nav { 
    background: #880e4f; 
    position: sticky; 
    top: 0; 
    z-index: 1000; 
    text-align: center; 
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
}

nav a { 
    color: white; 
    text-decoration: none; 
    padding: 15px 25px; 
    display: inline-block; 
    font-weight: bold; 
    transition: 0.3s;
}

nav a:hover { 
    background: var(--accent); 
    color: #333; 
}

.container { 
    max-width: 1100px; 
    margin: 30px auto; 
    padding: 30px; 
    background: white; 
    border-radius: 12px; 
    box-shadow: 0 5px 15px rgba(173, 20, 87, 0.1); 
}

h2 { 
    color: var(--primary); 
    border-left: 6px solid var(--accent); 
    padding-left: 15px; 
    font-size: 1.8rem;
}

.grid-3 { 
    display: grid; 
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); 
    gap: 25px; 
    margin: 20px 0; 
}

.card { 
    border: 1px solid #f0f0f0; 
    padding: 15px; 
    border-radius: 10px; 
    text-align: center; 
    background: #fff;
    transition: transform 0.3s, box-shadow 0.3s; 
}

.card:hover { 
    transform: translateY(-8px); 
    box-shadow: 0 8px 20px rgba(173, 20, 87, 0.15);
    border-color: var(--primary);
}

.card img { 
    width: 100%; 
    height: 220px; 
    object-fit: cover; 
    border-radius: 8px; 
}

.card h3 {
    color: var(--primary);
    margin-bottom: 5px;
}

footer { 
    background: #4a148c; /* Tím đậm */
    color: white; 
    text-align: center; 
    padding: 25px; 
    margin-top: 50px; 
}