* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: Arial, sans-serif;
}

body {
    line-height: 1.6;
}

/* Header */
header {
    background: #1f2a44;
    color: white;
    padding: 15px 0;
}

header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    width: 90%;
    margin: auto;
}

header nav a {
    color: white;
    margin-left: 20px;
    text-decoration: none;
    font-weight: bold;
}

/* Hero */
.hero {
    background: url('https://images.unsplash.com/photo-1581093588401-22f3c0e2b8d1') no-repeat center/cover;
    height: 90vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    color: white;
}

.hero-content {
    background: rgba(0,0,0,0.5);
    padding: 30px;
    border-radius: 10px;
}

.btn {
    display: inline-block;
    margin-top: 15px;
    padding: 10px 20px;
    background: #ff9800;
    color: white;
    text-decoration: none;
    border-radius: 5px;
}

/* Sections */
.section {
    padding: 60px 20px;
    text-align: center;
}

.section.dark {
    background: #f4f4f4;
}

.grid {
    display: flex;
    gap: 20px;
    margin-top: 30px;
    justify-content: center;
    flex-wrap: wrap;
}

.card {
    background: white;
    padding: 20px;
    border-radius: 8px;
    width: 280px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}

/* Footer */
footer {
    background: #1f2a44;
    color: white;
    text-align: center;
    padding: 15px;
}