/**
 * Browse-library styles for /idiom/.
 */

.idiom-library-main {
    background: var(--color-bg-base);
}

.library-intro-width {
    max-width: 920px;
}

.library-content-width {
    max-width: 800px;
}

.library-hero {
    padding: 3.5rem 0 4rem;
    border-bottom: 1px solid var(--color-border-subtle);
    background:
        radial-gradient(circle at 82% 8%, rgba(219, 234, 254, 0.48), transparent 28rem),
        linear-gradient(180deg, #ffffff 0%, var(--color-bg-base) 100%);
}

.library-breadcrumb {
    margin-bottom: 2.25rem;
}

.library-breadcrumb ol {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 0.4rem;
    list-style: none;
    margin: 0;
    padding: 0;
    color: var(--color-text-muted);
    font-size: 0.82rem;
    font-weight: 650;
}

.library-breadcrumb li + li::before {
    content: '/';
    margin-right: 0.4rem;
    color: var(--color-text-light);
}

.library-breadcrumb a {
    color: var(--color-text-secondary);
    text-underline-offset: 0.18em;
}

.library-hero h1 {
    max-width: 820px;
    margin: 0.55rem 0 0;
    color: var(--color-text-main);
    font-size: clamp(2.45rem, 6vw, 4.5rem);
    font-weight: 800;
    letter-spacing: -0.055em;
    line-height: 1.04;
    text-wrap: balance;
}

.library-lede {
    max-width: 760px;
    margin: 1.4rem 0 0;
    color: var(--color-text-secondary);
    font-size: clamp(1.05rem, 2vw, 1.2rem);
    line-height: 1.75;
}

.library-intro-note {
    max-width: 720px;
    margin: 0.75rem 0 0;
    color: var(--color-text-muted);
    font-size: 0.95rem;
    line-height: 1.7;
}

.library-browse-section {
    padding-top: 3.75rem;
    padding-bottom: 5rem;
}

.library-controls {
    display: grid;
    gap: 1.6rem;
    margin-bottom: 2.5rem;
    padding: 1.4rem;
    border: 1px solid var(--color-border-medium);
    border-radius: var(--radius-lg);
    background: rgba(255, 255, 255, 0.78);
    box-shadow: 0 12px 30px rgba(12, 21, 36, 0.035);
}

.library-search-field {
    max-width: 560px;
}

.library-search-field label,
.library-filter-label {
    display: block;
    margin-bottom: 0.55rem;
    color: var(--color-text-main);
    font-size: 0.78rem;
    font-weight: 800;
    letter-spacing: 0.055em;
    text-transform: uppercase;
}

.library-search-input-wrap {
    position: relative;
}

.library-search-input-wrap > span {
    position: absolute;
    top: 50%;
    left: 1rem;
    color: var(--color-text-muted);
    font-size: 1.25rem;
    line-height: 1;
    transform: translateY(-54%);
    pointer-events: none;
}

.library-search-input-wrap input {
    width: 100%;
    min-height: 3rem;
    padding: 0.75rem 1rem 0.75rem 2.8rem;
    border: 1px solid var(--color-border-medium);
    border-radius: var(--radius-md);
    background: #ffffff;
    color: var(--color-text-main);
    font: inherit;
    font-size: 0.95rem;
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.library-search-input-wrap input::placeholder {
    color: var(--color-text-muted);
}

.library-search-input-wrap input:focus-visible {
    border-color: var(--color-accent);
    outline: none;
    box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.15);
}

.library-filter-list {
    display: flex;
    flex-wrap: wrap;
    gap: 0.55rem;
}

.library-filter-button {
    display: inline-flex;
    align-items: center;
    min-height: 2.45rem;
    padding: 0.5rem 0.85rem;
    border: 1px solid var(--color-border-medium);
    border-radius: var(--radius-full);
    background: #ffffff;
    color: var(--color-text-secondary);
    font: inherit;
    font-size: 0.82rem;
    font-weight: 700;
    cursor: pointer;
    transition: color var(--transition-fast), border-color var(--transition-fast), background var(--transition-fast), transform var(--transition-fast);
}

.library-filter-button:hover {
    border-color: var(--color-accent-border);
    color: var(--color-text-main);
    transform: translateY(-1px);
}

.library-filter-button.is-active {
    border-color: var(--color-accent);
    background: var(--color-accent);
    color: #ffffff;
}

.library-filter-button.is-active::before {
    content: '✓';
    margin-right: 0.35rem;
    font-size: 0.72rem;
}

.library-filter-button:focus-visible,
.idiom-library-card a:focus-visible,
.library-empty-state button:focus-visible,
.library-breadcrumb a:focus-visible {
    outline: 2px solid var(--color-accent);
    outline-offset: 3px;
}

.idiom-library-grid {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 1rem;
    align-items: start;
}

.idiom-library-card {
    min-width: 0;
    padding: 1.35rem 1.4rem 1.45rem;
    border: 1px solid var(--color-border-medium);
    border-radius: var(--radius-lg);
    background: rgba(255, 255, 255, 0.84);
    box-shadow: 0 8px 22px rgba(12, 21, 36, 0.035);
    transition: border-color var(--transition-fast), transform var(--transition-fast), box-shadow var(--transition-fast);
}

.idiom-library-card:hover {
    border-color: var(--color-accent-border);
    transform: translateY(-2px);
    box-shadow: 0 14px 28px rgba(12, 21, 36, 0.06);
}

.idiom-library-card[hidden] {
    display: none;
}

.idiom-library-category {
    display: inline-flex;
    padding: 0.28rem 0.62rem;
    border-radius: var(--radius-full);
    background: var(--color-accent-soft);
    color: var(--color-accent-hover);
    font-size: 0.68rem;
    font-weight: 800;
    letter-spacing: 0.06em;
    text-transform: uppercase;
}

.idiom-library-card h2 {
    margin: 0.85rem 0 0;
    color: var(--color-text-main);
    font-size: 1.18rem;
    font-weight: 800;
    letter-spacing: -0.03em;
    line-height: 1.3;
}

.idiom-library-card p {
    margin: 0.55rem 0 0;
    color: var(--color-text-secondary);
    font-size: 0.9rem;
    line-height: 1.65;
}

.idiom-library-card a {
    display: inline-flex;
    align-items: center;
    gap: 0.3rem;
    margin-top: 1rem;
    border-radius: 0.25rem;
    color: var(--color-accent-hover);
    font-size: 0.84rem;
    font-weight: 800;
    text-decoration-thickness: 1px;
    text-underline-offset: 0.2em;
}

.library-empty-state {
    margin-top: 1rem;
    padding: 3.25rem 1.5rem;
    border: 1px dashed var(--color-border-medium);
    border-radius: var(--radius-lg);
    text-align: center;
}

.library-empty-state[hidden] {
    display: none;
}

.library-empty-state h2 {
    margin: 0;
    font-size: 1.35rem;
}

.library-empty-state p {
    margin: 0.55rem 0 0;
    color: var(--color-text-secondary);
}

.library-empty-state button {
    margin-top: 1rem;
    padding: 0;
    border: 0;
    border-radius: 0.25rem;
    background: transparent;
    color: var(--color-accent-hover);
    font: inherit;
    font-weight: 800;
    text-decoration: underline;
    text-underline-offset: 0.2em;
    cursor: pointer;
}

.library-learning-section {
    padding: 4.25rem 0;
    border-top: 1px solid var(--color-border-subtle);
    background: #ffffff;
}

.library-learning-section h2,
.library-return-cta h2 {
    margin: 0.55rem 0 0;
    color: var(--color-text-main);
    font-size: clamp(1.6rem, 3vw, 2.25rem);
    font-weight: 800;
    letter-spacing: -0.04em;
    line-height: 1.2;
    text-wrap: balance;
}

.library-learning-section p,
.library-return-cta p {
    margin: 0.9rem 0 0;
    color: var(--color-text-secondary);
    font-size: 1rem;
    line-height: 1.8;
}

.library-return-cta {
    padding: 4rem 0;
    border-top: 1px solid var(--color-border-subtle);
    background: var(--color-bg-warm);
}

.library-return-inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 2rem;
    max-width: 980px;
}

.library-return-inner > div {
    max-width: 650px;
}

@media (max-width: 960px) {
    .idiom-library-grid {
        grid-template-columns: repeat(2, minmax(0, 1fr));
    }
}

@media (max-width: 680px) {
    .library-hero {
        padding: 2.25rem 0 2.75rem;
    }

    .library-breadcrumb {
        margin-bottom: 1.5rem;
    }

    .library-hero h1 {
        font-size: clamp(2.05rem, 10vw, 3rem);
        line-height: 1.08;
    }

    .library-lede {
        margin-top: 1rem;
        font-size: 1rem;
        line-height: 1.7;
    }

    .library-browse-section {
        padding-top: 2.75rem;
        padding-bottom: 3.75rem;
    }

    .library-controls {
        gap: 1.35rem;
        margin-bottom: 2rem;
        padding: 1.1rem;
    }

    .idiom-library-grid {
        grid-template-columns: 1fr;
    }

    .library-learning-section,
    .library-return-cta {
        padding: 3.25rem 0;
    }

    .library-return-inner {
        align-items: flex-start;
        flex-direction: column;
    }
}

@media (max-width: 360px) {
    .library-breadcrumb ol {
        font-size: 0.75rem;
    }

    .library-hero h1 {
        font-size: 1.95rem;
    }

    .library-filter-button {
        padding-inline: 0.72rem;
        font-size: 0.78rem;
    }
}