/* ══════════════════════════════════════════════════════════════
    LIBRARY & RESOURCES STYLES
    ══════════════════════════════════════════════════════════════ */

.page-hero {
    padding: calc(var(--nav-height) + 4rem) 2rem 3rem;
    text-align: center;
    max-width: 800px;
    margin: 0 auto;
}

.page-hero h1 {
    font-size: clamp(2.5rem, 5vw, 3.5rem);
    margin-bottom: 1rem;
    color: var(--text-primary);
}

.page-hero .subtitle {
    font-size: 1.125rem;
    color: var(--text-secondary);
    line-height: 1.7;
}

/* Stats bar */
.library-stats {
    display: flex;
    gap: 3rem;
    justify-content: center;
    padding: 2rem 0;
    border-bottom: 1px solid var(--border-subtle);
    margin-bottom: 2rem;
}

.stat {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.25rem;
}

.stat-number {
    font-size: 2rem;
    font-weight: 700;
    color: var(--text-primary);
    font-family: var(--font-mono);
}

.stat-label {
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.14em;
    color: var(--text-muted);
    font-family: var(--font-mono);
}

/* Filters */
.filters-section {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 2rem 2rem;
}

.filter-card {
    margin-bottom: 3rem;
    padding: 1.75rem;
    border-radius: 8px;
    background: var(--color-surface);
    border: 1px solid var(--border-subtle);
}

.filter-row {
    display: flex;
    gap: 0.75rem;
    flex-wrap: wrap;
    margin-bottom: 1rem;
}

.search-field {
    position: relative;
}

.search-input {
    width: 100%;
    padding: 0.875rem 1rem;
    background: var(--field-bg);
    border: 1px solid var(--field-border);
    border-radius: 6px;
    color: var(--field-text);
    font-family: var(--font-sans);
    font-size: 0.9375rem;
    transition: border-color 160ms ease, box-shadow 160ms ease;
}

.search-input::placeholder {
    color: var(--field-placeholder);
}

.search-input:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(47, 79, 58, 0.1);
}

.filters-container {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
    background: var(--color-surface);
    padding: 1.5rem;
    border-radius: 8px;
    border: 1px solid var(--border-subtle);
}

.search-wrapper {
    position: relative;
}

.search-wrapper i {
    position: absolute;
    left: 1rem;
    top: 50%;
    transform: translateY(-50%);
    color: var(--text-muted);
    font-size: 0.875rem;
}

.search-wrapper input {
    width: 100%;
    padding: 1rem 1rem 1rem 2.75rem;
    background: var(--field-bg);
    border: 1px solid var(--field-border);
    border-radius: 6px;
    color: var(--field-text);
    font-family: var(--font-mono);
    font-size: 0.9375rem;
    transition: border-color 160ms ease, box-shadow 160ms ease;
}

.search-wrapper input:focus {
    outline: none;
    border-color: var(--accent);
    box-shadow: 0 0 0 3px rgba(47, 79, 58, 0.1);
}

.search-wrapper input::placeholder {
    color: var(--field-placeholder);
}

.filter-tags {
    display: flex;
    gap: 0.625rem;
    flex-wrap: wrap;
}

.filter-btn {
    padding: 0.5rem 1rem;
    border-radius: 6px;
    background: transparent;
    border: 1px solid var(--border-subtle);
    color: var(--text-secondary);
    cursor: pointer;
    font-family: var(--font-mono);
    font-size: 0.7rem;
    font-weight: 500;
    letter-spacing: 0.14em;
    text-transform: uppercase;
    transition: all 160ms ease;
    font-variant-numeric: tabular-nums;
    will-change: transform;
}

.filter-btn:hover {
    color: var(--accent);
    border-color: var(--accent);
    background: var(--filter-hover-bg);
    transform: translateY(-1px);
}

.filter-btn:active {
    transform: translateY(0);
}

.filter-btn.active {
    background: var(--filter-active-bg);
    color: var(--text-primary);
    border-color: var(--accent);
    font-weight: 600;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

/* Grid */
.library-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
    gap: 1.5rem;
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 2rem 6rem;
}

.book-card {
    display: flex;
    flex-direction: column;
    gap: 1rem;
    padding: 1.5rem;
    background: var(--color-surface);
    border: 1px solid var(--border-subtle);
    border-radius: 0;
    transition: none;
    position: relative;
    overflow: hidden;
}

.book-card:hover {
    border-color: var(--border-visible);
    background: var(--card-hover);
}

.book-type {
    font-size: 0.6875rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.14em;
    color: var(--text-secondary);
    font-family: var(--font-mono);
    font-variant-numeric: tabular-nums;
}

.book-title {
    font-size: 1.125rem;
    font-weight: 600;
    color: var(--text-primary);
    line-height: 1.4;
}

.book-author {
    font-size: 0.875rem;
    color: var(--text-muted);
}

.book-desc {
    font-size: 0.9375rem;
    color: var(--text-secondary);
    line-height: 1.6;
    flex-grow: 1;
}

.book-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-top: 0.5rem;
}

.book-tag {
    font-size: 0.75rem;
    padding: 0.25rem 0.5rem;
    background: transparent;
    color: var(--text-secondary);
    border-radius: 0;
    border: 1px solid var(--border-subtle);
    font-family: var(--font-mono);
    font-variant-numeric: tabular-nums;
}

/* Book header */
.book-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 1rem;
}

.book-meta {
    font-size: 0.8125rem;
    color: var(--text-muted);
    margin-top: -0.5rem;
    margin-bottom: 0.5rem;
}

.book-quote {
    margin: 0.75rem 0;
    padding: 0.75rem;
    border-left: 2px solid var(--accent);
    font-size: 0.875rem;
    font-style: italic;
    color: var(--text-secondary);
    background: var(--field-bg);
}

.book-links {
    display: flex;
    gap: 0.75rem;
    margin-top: auto;
    padding-top: 1rem;
    border-top: 1px solid var(--border-subtle);
}

.book-link {
    font-size: 0.8125rem;
    padding: 0.4rem 0.75rem;
    background: transparent;
    border: 1px solid var(--border-subtle);
    color: var(--text-secondary);
    text-decoration: none;
    font-family: var(--font-mono);
    font-weight: 500;
    transition: none;
}

.book-link:hover {
    border-color: var(--accent);
    color: var(--accent);
}

.hide-item {
    display: none !important;
}

@media (max-width: 640px) {
    .library-grid {
        grid-template-columns: 1fr;
        padding: 0 1.5rem 4rem;
    }

    .filters-section {
        padding: 0 1.5rem 2rem;
    }

    .filter-card {
        padding: 1.25rem;
        border-radius: 6px;
    }

    .filter-row {
        gap: 0.5rem;
    }

    .filter-btn {
        padding: 0.4rem 0.75rem;
        font-size: 0.65rem;
    }

    .filters-container {
        padding: 1rem;
        border-radius: 6px;
    }

    .book-card {
        padding: 1.25rem;
        border-radius: 6px;
    }

    .book-title {
        font-size: 1.05rem;
    }

    .book-desc {
        font-size: 0.9rem;
    }
}

@media (max-width: 480px) {
    .library-grid {
        padding: 0 1rem 3.5rem;
    }

    .filters-section {
        padding: 0 1rem 1.5rem;
    }

    .filter-btn {
        flex: 1 0 auto;
        min-width: calc(50% - 0.375rem);
        text-align: center;
    }
}