/* Коллекция историй: тёмная схема и акцент «горчичное золото» */

body.books-collection {
    --bc-bg: #121212;
    --bc-surface: #1a1a1a;
    --bc-surface-2: #1e1e1e;
    --bc-accent: #d4af37;
    --bc-accent-dim: rgba(212, 175, 55, 0.35);
    --bc-text: #f2f2e8;
    --bc-muted: #9a9a8e;
    --bc-border: rgba(255, 255, 255, 0.1);
}

body.books-collection .books-main,
body.books-collection .books-hub-main {
    max-width: 1200px;
    padding-top: 96px;
    padding-bottom: 72px;
}

body.books-collection .collection-header {
    text-align: center;
    margin-bottom: 40px;
}

body.books-collection .collection-title {
    font-family: var(--font-display);
    font-size: clamp(2rem, 5vw, 2.75rem);
    font-weight: 700;
    color: var(--bc-text);
    margin: 0 0 12px;
    letter-spacing: -0.02em;
    line-height: 1.15;
}

body.books-collection .collection-subtitle {
    font-size: 16px;
    line-height: 1.55;
    color: var(--bc-muted);
    margin: 0 auto;
    max-width: 520px;
}

/* Языки */
body.books-collection .collection-lang-row {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 12px;
    margin-bottom: 28px;
}

body.books-collection .collection-lang-btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 10px 20px;
    border-radius: 999px;
    font-size: 14px;
    font-weight: 600;
    text-decoration: none;
    border: 1px solid var(--bc-border);
    background: rgba(255, 255, 255, 0.04);
    color: var(--bc-muted);
    cursor: pointer;
    transition: background 0.2s, color 0.2s, border-color 0.2s;
    font-family: inherit;
}

body.books-collection .collection-lang-btn:hover {
    color: var(--bc-text);
    border-color: var(--bc-accent-dim);
}

body.books-collection .collection-lang-btn.is-active {
    background: var(--bc-accent);
    color: #121212;
    border-color: var(--bc-accent);
}

body.books-collection .collection-lang-flag {
    font-size: 16px;
    line-height: 1;
}

/* Уровни CEFR */
body.books-collection .collection-level-row {
    display: flex;
    flex-wrap: wrap;
    justify-content: center;
    gap: 8px;
    margin-bottom: 40px;
}

body.books-collection .collection-level-btn {
    min-width: 52px;
    padding: 8px 12px;
    border-radius: 8px;
    font-size: 13px;
    font-weight: 600;
    border: 1px solid var(--bc-border);
    background: rgba(255, 255, 255, 0.03);
    color: var(--bc-muted);
    cursor: pointer;
    transition: border-color 0.2s, color 0.2s, background 0.2s;
    font-family: inherit;
}

body.books-collection a.collection-level-btn {
    text-decoration: none;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    box-sizing: border-box;
}

body.books-collection .collection-level-btn:hover {
    color: var(--bc-text);
    border-color: var(--bc-accent-dim);
}

body.books-collection .collection-level-btn.is-active {
    border-color: var(--bc-accent);
    color: var(--bc-accent);
    background: rgba(212, 175, 55, 0.08);
}

/* Сетка карточек */
body.books-collection .collection-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
    gap: 22px;
}

body.books-collection .collection-card {
    display: block;
    text-decoration: none;
    color: inherit;
    border-radius: 14px;
    overflow: hidden;
    background: var(--bc-surface);
    border: 1px solid var(--bc-border);
    transition: transform 0.25s ease, border-color 0.25s ease, box-shadow 0.25s ease;
}

body.books-collection .collection-card:hover {
    transform: translateY(-4px);
    border-color: var(--bc-accent-dim);
    box-shadow: 0 16px 40px rgba(0, 0, 0, 0.45);
}

body.books-collection .collection-card-cover {
    position: relative;
    aspect-ratio: 3 / 4;
    background: #0d0d0d;
}

body.books-collection .collection-card-cover img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    object-position: top center;
    display: block;
}

body.books-collection .collection-card-badge {
    position: absolute;
    top: 10px;
    right: 10px;
    padding: 6px 10px;
    border-radius: 999px;
    font-size: 12px;
    font-weight: 700;
    letter-spacing: 0.04em;
    color: #ffffff;
    background: rgba(0, 0, 0, 0.84);
    border: 1px solid rgba(255, 255, 255, 0.18);
    box-shadow: 0 6px 14px rgba(0, 0, 0, 0.45);
}

body.books-collection .collection-card-body {
    padding: 14px 16px 16px;
    background: var(--bc-surface-2);
    border-top: 1px solid rgba(255, 255, 255, 0.06);
}

body.books-collection .collection-card-title {
    font-family: var(--font-display);
    font-size: 1rem;
    font-weight: 600;
    color: var(--bc-text);
    margin: 0 0 10px;
    line-height: 1.35;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
}

body.books-collection .collection-card-meta {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 14px 18px;
    font-size: 12px;
    color: var(--bc-muted);
}

body.books-collection .collection-card-meta span {
    display: inline-flex;
    align-items: center;
    gap: 5px;
}

body.books-collection .collection-meta-icon {
    color: var(--bc-accent);
    font-size: 13px;
}

body.books-collection .collection-empty {
    text-align: center;
    padding: 48px 24px;
    color: var(--bc-muted);
    font-size: 16px;
    display: none;
}

body.books-collection .collection-empty.is-visible {
    display: block;
}

body.books-collection .books-empty {
    color: var(--bc-muted);
}

body.books-collection .collection-empty-static {
    text-align: center;
    margin-top: 8px;
}

@media (max-width: 640px) {
    body.books-collection .collection-grid {
        grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
        gap: 16px;
    }

    body.books-collection .collection-level-row {
        gap: 6px;
    }

    body.books-collection .collection-level-btn {
        min-width: 44px;
        padding: 7px 8px;
        font-size: 12px;
    }
}