/* Genel Stiller */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

body {
    background-color: #f5f7fa;
    color: #333;
    line-height: 1.6;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem;
}

/* Başlık Stili */
header {
    text-align: center;
    margin-bottom: 3rem;
}

header h1 {
    font-size: 2.5rem;
    color: #2c3e50;
    margin-bottom: 0.5rem;
}

header p {
    color: #7f8c8d;
    font-size: 1.1rem;
}

/* Katalog Grid Yapısı */
.catalog-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 2rem;
}

/* Katalog Kart Stili */
.catalog-card {
    background-color: #fff;
    border-radius: 10px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
    overflow: hidden;
    transition: transform 0.3s ease, box-shadow 0.3s ease, opacity 0.5s ease;
    display: flex;
    flex-direction: column;
    height: 100%;
    opacity: 0; /* Başlangıçta görünmez, JavaScript ile görünür yapılacak */
}

.catalog-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.15);
}

.catalog-content {
    padding: 1.5rem;
    flex-grow: 1;
}

.catalog-content h2 {
    color: #3498db;
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
    border-bottom: 2px solid #f1f1f1;
    padding-bottom: 0.5rem;
}

.catalog-content p {
    color: #7f8c8d;
}

.catalog-actions {
    padding: 1rem 1.5rem;
    background-color: #f8f9fa;
    border-top: 1px solid #eee;
}

/* İnceleme Butonu Stili */
.download-btn {
    display: inline-block;
    background-color: #3498db;
    color: white;
    padding: 0.6rem 1.2rem;
    border-radius: 50px;
    text-decoration: none;
    font-weight: 500;
    transition: background-color 0.3s ease;
    width: 100%;
    text-align: center;
}

.download-btn:hover {
    background-color: #2980b9;
}

.download-btn i {
    margin-right: 0.5rem;
}

/* Tıklama animasyonu */
.download-btn.clicking {
    background-color: #27ae60;
    position: relative;
    overflow: hidden;
}

.download-btn.clicking::after {
    content: '';
    position: absolute;
    left: -100%;
    top: 0;
    height: 100%;
    width: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
    animation: clickingEffect 0.5s;
}

@keyframes clickingEffect {
    0% { left: -100%; }
    100% { left: 100%; }
}

/* Responsive Tasarım */
@media (max-width: 768px) {
    .catalog-grid {
        grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
        gap: 1.5rem;
    }
    
    header h1 {
        font-size: 2rem;
    }
    
    .container {
        padding: 1.5rem;
    }
}

@media (max-width: 480px) {
    .catalog-grid {
        grid-template-columns: 1fr;
    }
    
    header h1 {
        font-size: 1.8rem;
    }
    
    .container {
        padding: 1rem;
    }
}