:root {
    --primary: #0a2540;
    --accent: #2d8cff;
    --bg: #f4f7fb;
    --card: #ffffff;
}

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

body {
    background: var(--bg);
    color: #333;
}

/* Header */
header {
    background: var(--primary);
    color: white;
    padding: 20px 40px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

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

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

/* Hero */
.hero {
    padding: 60px 20px;
    text-align: center;
    background: linear-gradient(135deg, #0a2540, #1e3a5f);
    color: white;
}

.hero h2 {
    font-size: 32px;
    margin-bottom: 10px;
}

/* Filters */
.filters {
    padding: 30px;
    text-align: center;
}

.filters input,
.filters select {
    padding: 10px;
    width: 220px;
    border-radius: 6px;
    border: 1px solid #ccc;
    margin: 5px;
}

.filters button {
    padding: 10px 18px;
    border: none;
    border-radius: 6px;
    background: var(--accent);
    color: white;
    cursor: pointer;
}

/* Catalog */
.catalog {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
    gap: 20px;
    padding: 20px 40px 60px;
}

.card {
    background: var(--card);
    padding: 20px;
    border-radius: 10px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.05);
    transition: 0.3s;
}

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

.card h3 {
    margin-bottom: 10px;
    color: var(--primary);
}

.card p {
    font-size: 14px;
    margin-bottom: 15px;
}

.tag {
    display: inline-block;
    padding: 5px 10px;
    background: #e6f0ff;
    color: var(--accent);
    border-radius: 20px;
    font-size: 12px;
    margin-bottom: 10px;
}

.open-btn {
    display: block;
    width: 100%;
    padding: 10px;
    border: none;
    border-radius: 6px;
    background: var(--accent);
    color: white;
    cursor: pointer;
}

.open-btn:hover {
    opacity: 0.9;
}

/* Footer */
footer {
    text-align: center;
    padding: 20px;
    background: var(--primary);
    color: white;
}