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

body {
    background: #f5f6fa;
}

/* Header */

.header {
    text-align: center;
    padding: 40px 20px;
    background: white;
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.05);
}

.header h1 {
    margin-bottom: 10px;
}

/* Container */

.container {
    max-width: 1100px;
    margin: auto;
    padding: 40px 20px;
}

/* Grid */

.card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 24px;
}

/* Card */

.card {
    background: white;
    border-radius: 10px;
    overflow: hidden;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.08);
    transition: transform 0.2s ease;
}

.card:hover {
    transform: translateY(-5px);
}

/* Image */

.card img {
    width: 100%;
    height: 160px;
    object-fit: cover;
}

/* Card Content */

.card-content {
    padding: 16px;
}

.card-content h3 {
    margin-bottom: 12px;
}

/* Buttons */

.card-buttons {
    display: flex;
    gap: 10px;
}

.btn {
    text-decoration: none;
    padding: 8px 14px;
    border-radius: 6px;
    font-size: 14px;
    font-weight: 500;
}

.preview {
    background: #007bff;
    color: white;
}

.github {
    background: #24292e;
    color: white;
}

.btn:hover {
    opacity: 0.9;
}

/* Footer */

.footer {
    text-align: center;
    padding: 20px;
    color: #666;
}