:root {
    --bg-color: #f9f9fb;
    --card-bg: #ffffff;
    --text-color: #333;
    --accent-color: #4a90e2;
}

body {
    font-family: 'Helvetica Neue', Arial, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    margin: 0;
    line-height: 1.6;
}

header {
    text-align: center;
    padding: 4rem 1rem;
    background: linear-gradient(135deg, #4a90e2 0%, #63b3ed 100%);
    color: white;
}

.container {
    max-width: 1000px;
    margin: -2rem auto 3rem;
    padding: 0 1rem;
}

.grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 1.5rem;
}

.card {
    background: var(--card-bg);
    border-radius: 12px;
    text-decoration: none;
    color: inherit;
    box-shadow: 0 4px 6px rgba(0,0,0,0.05);
    transition: transform 0.2s, box-shadow 0.2s;
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: 0 12px 20px rgba(0,0,0,0.1);
}

.card-content {
    padding: 1.5rem;
}

.card h3 {
    margin-top: 0;
    color: var(--accent-color);
}

.tag {
    display: inline-block;
    background: #e2e8f0;
    font-size: 0.75rem;
    padding: 0.2rem 0.6rem;
    border-radius: 4px;
    margin-top: 1rem;
}

.placeholder {
    opacity: 0.6;
    border: 2px dashed #cbd5e0;
    background: transparent;
    box-shadow: none;
}