:root {
    --bg-color: #f9fafb;
    --card-bg: #ffffff;
    --text-primary: #1e293b;
    --text-secondary: #64748b;
    --accent: #2563eb;
    --border: #e2e8f0;
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-primary);
    line-height: 1.6;
}

.header {
    text-align: center;
    padding: 3rem 1rem;
    background-color: white;
    border-bottom: 1px solid var(--border);
}

.header h1 {
    margin-bottom: 0.5rem;
    font-size: 2.5rem;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem 1rem;
}

/* Блок поиска и фильтров */
.filter-section {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    align-items: end;
    justify-content: center;
    padding: 1rem;
    background-color: white;
    border-radius: 8px;
    margin-bottom: 2rem;
    border: 1px solid var(--border);
}

#search-input {
    flex-grow: 1;
    min-width: 300px;
    padding: 0.8rem 1rem;
    border: 1px solid var(--border);
    border-radius: 6px;
    font-size: 1rem;
}

#search-input:focus {
    outline: none;
    border-color: var(--accent);
}

.tag-filters {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
}

.tag-btn {
    background: transparent;
    border: 1px solid var(--accent);
    color: var(--accent);
    padding: 0.4rem 0.8rem;
    border-radius: 9999px;
    cursor: pointer;
    font-size: 0.9rem;
    transition: all 0.2s ease;
}

.tag-btn.active {
    background-color: var(--accent);
    color: white;
}

.tag-btn:hover:not(.active) {
    background-color: rgba(37, 99, 235, 0.1);
}

/* Сетка карточек */
.link-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 1.5rem;
}

.card-link {
    display: block;
    background-color: var(--card-bg);
    border: 1px solid var(--border);
    border-radius: 8px;
    padding: 1.5rem;
    text-decoration: none;
    color: inherit;
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.card-link:hover {
    transform: translateY(-4px);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
}

.card-title {
    font-size: 1.2rem;
    font-weight: 600;
    margin-bottom: 0.5rem;
    color: var(--text-primary);
}

.card-desc {
    font-size: 0.95rem;
    color: var(--text-secondary);
    margin-bottom: 1rem;
    min-height: 40px; /* чтобы высота карточек была стабильной */
}

.card-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.4rem;
}

.card-tag {
    font-size: 0.75rem;
    background-color: #f1f5f9;
    color: #475569;
    padding: 0.2rem 0.6rem;
    border-radius: 4px;
}

@media (max-width: 600px) {
    .filter-section {
        flex-direction: column;
        align-items: stretch;
    }
    .header h1 { font-size: 2rem; }
}