:root {
    --primary: #2c3e50;
    --secondary: #3498db;
    --light: #ecf0f1;
    --dark: #1a252f;
    --success: #27ae60;
}
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}
body {
    background-color: var(--light);
    color: var(--dark);
    line-height: 1.6;
}
header {
    background: var(--primary);
    color: white;
    padding: 2rem 0;
    text-align: center;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}
h1 {
    font-size: 2.5rem;
    margin-bottom: 1rem;
}
.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
}
.search-box {
    margin: 2rem auto;
    max-width: 600px;
}
#search {
    width: 100%;
    padding: 12px 20px;
    border: 2px solid var(--secondary);
    border-radius: 50px;
    font-size: 1rem;
    outline: none;
}
.category {
    margin: 3rem 0;
}
.category h2 {
    border-bottom: 2px solid var(--secondary);
    padding-bottom: 10px;
    margin-bottom: 20px;
    color: var(--primary);
}
.format-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 20px;
}
.format-card {
    background: white;
    border-radius: 8px;
    padding: 20px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s;
}
.format-card:hover {
    transform: translateY(-5px);
}
.format-card h3 {
    color: var(--secondary);
    margin-bottom: 10px;
    font-size: 1.3rem;
}
.format-card .extension {
    display: inline-block;
    background: var(--primary);
    color: white;
    padding: 3px 8px;
    border-radius: 4px;
    font-family: monospace;
    margin-bottom: 10px;
}
.format-card p {
    margin-bottom: 10px;
}
.properties {
    font-size: 0.9rem;
    color: #555;
}
.properties span {
    display: block;
    margin: 5px 0;
}
footer {
    background: var(--dark);
    color: white;
    text-align: center;
    padding: 2rem 0;
    margin-top: 3rem;
}
@media (max-width: 768px) {
    .format-grid {
        grid-template-columns: 1fr;
    }
}