/* ========================================
   LIBRARY OVERLAY — Phase 2
   ======================================== */

/* ---- Full-screen overlay shell ---- */
#libraryOverlay {
    display: none;
    position: fixed;
    inset: 0;
    background: var(--overlay-bg);
    z-index: 9999;
    flex-direction: column;
    overflow: hidden;
}
#libraryOverlay.active { display: flex; }

/* ---- Inner layout: sticky head + scrolling body ---- */

.library-content {
    display: flex;
    flex-direction: column;
    width: 100%;
    max-width: 900px;
    margin: 0 auto;
    height: 100%;
    border-radius: var(--border-radius-lg);
    overflow: hidden;
    box-shadow: var(--box-shadow-lg);
    height: 85vh;
    border-radius: var(--border-radius);
    position: relative;
}
.library-head {
    flex-shrink: 0;
    background: var(--card-bg);
    border-bottom: 1px solid var(--border-color);
    padding: 1.25rem 1.5rem 1rem;
    position: sticky;
    top: 0;
    z-index: 10;
    box-shadow: 0 2px 12px var(--shadow-color);
}

.library-body {
    flex: 1;
    background: var(--bg-color);
    overflow-y: auto;
    padding: 1.5rem;
    scrollbar-width: thin;
    scrollbar-color: var(--accent-color) transparent;
}
.library-body::-webkit-scrollbar { width: 6px; }
.library-body::-webkit-scrollbar-thumb {
    background: var(--accent-color);
    border-radius: var(--border-radius-pill);
    opacity: 0.5;
}

.library-save-panel {
    margin-bottom: 1.25rem;
    padding: 1rem;
    border-radius: var(--border-radius);
    border: 1.5px solid var(--border-color);
    background: color-mix(in srgb, var(--highlight-color) 85%, var(--card-bg) 15%);
}

.library-save-header {
    display: flex;
    justify-content: space-between;
    gap: 1rem;
    align-items: flex-start;
    margin-bottom: 1rem;
    flex-wrap: wrap;
}

.library-save-kicker {
    display: inline-flex;
    align-items: center;
    gap: 0.35rem;
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-bold);
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--accent-color);
}

.library-save-header h3 {
    margin: 0.2rem 0 0;
    font-size: var(--font-size-xl);
    color: var(--text-color);
}

.library-save-header p {
    margin: 0;
    color: var(--text-muted);
    max-width: 28rem;
    font-size: var(--font-size-sm);
}

.library-save-grid {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 0.85rem;
}

.library-field {
    display: grid;
    gap: 0.45rem;
}

.library-field-full {
    grid-column: 1 / -1;
}

.library-field span {
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-semibold);
    color: var(--text-muted);
}

.library-field input,
.library-field select {
    width: 100%;
    min-height: 3rem;
    padding: 0.7rem 0.9rem;
    border: 1.5px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    background: var(--input-bg);
    color: var(--text-color);
    font: inherit;
    box-sizing: border-box;
}

.library-field input:focus,
.library-field select:focus {
    outline: none;
    border-color: var(--accent-color);
    box-shadow: var(--focus-ring);
}

.library-save-actions {
    display: flex;
    align-items: center;
    gap: 1rem;
    flex-wrap: wrap;
    margin-top: 1rem;
}

.library-save-btn {
    min-height: 3rem;
    padding: 0.75rem 1.1rem;
    border: none;
    border-radius: var(--border-radius-sm);
    background: var(--accent-color);
    color: var(--text-on-accent);
    font: inherit;
    font-weight: var(--font-weight-semibold);
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    transition: transform var(--transition-speed) ease,
                box-shadow var(--transition-speed) ease;
}

.library-save-btn:hover {
    transform: translateY(-2px);
    box-shadow: var(--box-shadow-hover);
}

.library-save-status {
    margin: 0;
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-semibold);
}

.library-save-status[data-tone="success"] {
    color: var(--success-color);
}

.library-save-status[data-tone="error"] {
    color: var(--danger-color);
}

/* ---- Header row (title + close) ---- */
.library-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    margin-bottom: 0.9rem;
}
.library-header-actions {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    margin-left: auto;
}
.library-header-text h2 {
    font-size: var(--font-size-xl);
    font-weight: var(--font-weight-bold);
    color: var(--accent-color);
    margin: 0 0 0.2rem;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}
.library-header-text p {
    font-size: var(--font-size-xs);
    color: var(--text-muted);
    margin: 0;
    max-width: 100%;
}

/* Close button positioned inside header row */
#closeLibraryOverlay {
    position: static;
    flex-shrink: 0;
    margin-left: 0;
}

.library-fab {
    border: none;
    min-height: 3rem;
    padding: 0.75rem 1rem;
    border-radius: var(--border-radius-pill);
    background: linear-gradient(135deg, var(--accent-color), var(--accent-secondary));
    color: var(--text-on-accent);
    font: inherit;
    font-weight: var(--font-weight-semibold);
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    cursor: pointer;
    box-shadow: var(--box-shadow-md);
    transition: transform var(--transition-speed) ease,
        box-shadow var(--transition-speed) ease;
}

.library-fab:hover {
    transform: translateY(-2px);
    box-shadow: var(--box-shadow-hover);
}

/* ---- Toolbar ---- */
.library-toolbar {
    display: flex;
    gap: 0.6rem;
    align-items: center;
    flex-wrap: wrap;
}

/* Search */
.library-search-wrap {
    flex: 1;
    min-width: 160px;
    position: relative;
    display: flex;
    align-items: center;
}
.library-search-wrap i {
    position: absolute;
    left: 0.85rem;
    color: var(--text-muted);
    font-size: 0.8rem;
    pointer-events: none;
}
#librarySearch {
    width: 100%;
    padding: 0.6rem 0.9rem 0.6rem 2.4rem;
    border: 1.5px solid var(--border-color);
    border-radius: var(--border-radius-pill);
    background: var(--input-bg);
    color: var(--text-color);
    font-size: var(--font-size-sm);
    font-family: inherit;
    outline: none;
    transition: border-color var(--transition-speed) ease,
                box-shadow var(--transition-speed) ease;
    box-sizing: border-box;
}
#librarySearch:focus {
    border-color: var(--accent-color);
    box-shadow: var(--focus-ring);
}
#librarySearch::placeholder { color: var(--text-muted); opacity: 0.7; }

/* Filter dropdown */
.library-filter-wrap {
    flex-shrink: 0;
    position: relative;
    display: flex;
    align-items: center;
}
.library-filter-wrap i {
    position: absolute;
    left: 0.85rem;
    color: var(--text-muted);
    font-size: 0.75rem;
    pointer-events: none;
}
#libraryTypeFilter {
    appearance: none;
    -webkit-appearance: none;
    padding: 0.6rem 2rem 0.6rem 2.3rem;
    border: 1.5px solid var(--border-color);
    border-radius: var(--border-radius-pill);
    background: var(--input-bg);
    color: var(--text-color);
    font-size: var(--font-size-sm);
    font-family: inherit;
    font-weight: var(--font-weight-semibold);
    cursor: pointer;
    outline: none;
    transition: border-color var(--transition-speed) ease,
                box-shadow var(--transition-speed) ease;
    background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='8' viewBox='0 0 12 8'%3E%3Cpath d='M1 1l5 5 5-5' stroke='%23888' stroke-width='1.5' fill='none' stroke-linecap='round'/%3E%3C/svg%3E");
    background-repeat: no-repeat;
    background-position: right 0.75rem center;
}
#libraryTypeFilter:focus {
    border-color: var(--accent-color);
    box-shadow: var(--focus-ring);
}

/* Sort buttons */
.library-sort {
    display: flex;
    gap: 0.35rem;
    flex-shrink: 0;
}
.lib-sort-btn {
    padding: 0.6rem 1rem;
    border: 1.5px solid var(--border-color);
    border-radius: var(--border-radius-pill);
    background: var(--input-bg);
    color: var(--text-muted);
    font-size: var(--font-size-xs);
    font-family: inherit;
    font-weight: var(--font-weight-semibold);
    cursor: pointer;
    transition: all var(--transition-speed) ease;
    white-space: nowrap;
}
.lib-sort-btn:hover {
    border-color: var(--accent-color);
    color: var(--accent-color);
}
.lib-sort-btn.active {
    background: var(--accent-color);
    border-color: var(--accent-color);
    color: var(--text-on-accent);
}

/* Count */
.library-count-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
    margin-bottom: 1rem;
    flex-wrap: wrap;
}

.library-count {
    font-size: var(--font-size-xs);
    color: var(--text-muted);
    text-align: right;
}

.library-status {
    margin: 0;
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-semibold);
}

.library-status[data-tone="success"] {
    color: var(--success-color);
}

.library-status[data-tone="error"] {
    color: var(--danger-color);
}

/* ---- Book Grid ---- */
.library-grid {
    display: grid;
    grid-template-columns: repeat(var(--library-desktop-columns, 4), minmax(0, 1fr));
    gap: 1.1rem;
    align-items: start;
}

/* ---- Book Card ---- */
.lib-card {
    position: relative;
    display: flex;
    flex-direction: column;
    background: var(--highlight-color);
    border: 1.5px solid var(--border-color);
    border-radius: var(--border-radius);
    overflow: hidden;
    color: var(--text-color);
    transition: transform var(--transition-speed) ease,
                box-shadow var(--transition-speed) ease,
                border-color var(--transition-speed) ease;
    cursor: pointer;
    outline: none;
}
.lib-card:hover,
.lib-card:focus-visible {
    transform: translateY(-4px);
    box-shadow: var(--box-shadow-hover);
    border-color: var(--accent-color);
}

/* Cover */
.lib-card-cover {
    width: 100%;
    aspect-ratio: 3 / 4;
    background: var(--surface-alt);
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
}
.lib-card-img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
    transition: transform 0.3s ease;
}
.lib-card:hover .lib-card-img { transform: scale(1.04); }
.lib-card-cover.no-img .lib-card-img { display: none; }
.lib-card-placeholder {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 100%;
    height: 100%;
    font-size: 2rem;
    color: var(--accent-color);
    opacity: 0.35;
}

.lib-card-badges {
    position: absolute;
    top: 0.45rem;
    left: 0.45rem;
    display: flex;
    flex-wrap: wrap;
    gap: 0.35rem;
    z-index: 1;
    pointer-events: none;
}

.lib-type-badge {
    padding: 0.2rem 0.55rem;
    border-radius: var(--border-radius-pill);
    font-size: 0.65rem;
    font-weight: var(--font-weight-bold);
    display: flex;
    align-items: center;
    gap: 0.25rem;
    backdrop-filter: blur(6px);
    -webkit-backdrop-filter: blur(6px);
    letter-spacing: 0.02em;
}

.lib-source-badge {
    padding: 0.2rem 0.55rem;
    border-radius: var(--border-radius-pill);
    font-size: 0.65rem;
    font-weight: var(--font-weight-bold);
    letter-spacing: 0.02em;
    background: color-mix(in srgb, var(--card-bg) 86%, transparent);
    border: 1px solid color-mix(in srgb, var(--border-color) 70%, transparent);
    color: var(--text-color);
    backdrop-filter: blur(6px);
    -webkit-backdrop-filter: blur(6px);
}

.lib-source-custom {
    color: #10b981;
    border-color: color-mix(in srgb, #10b981 28%, transparent);
}

.lib-source-official {
    color: var(--text-muted);
}
.lib-type-link {
    background: color-mix(in srgb, var(--accent-color) 18%, var(--card-bg) 82%);
    color: var(--accent-color);
    border: 1px solid color-mix(in srgb, var(--accent-color) 30%, transparent);
}
.lib-type-pdf {
    background: color-mix(in srgb, #ef4444 18%, var(--card-bg) 82%);
    color: #ef4444;
    border: 1px solid color-mix(in srgb, #ef4444 30%, transparent);
}
.lib-type-app {
    background: color-mix(in srgb, #10b981 18%, var(--card-bg) 82%);
    color: #10b981;
    border: 1px solid color-mix(in srgb, #10b981 30%, transparent);
}

.lib-card-delete-btn {
    position: absolute;
    top: 0.45rem;
    right: 0.45rem;
    width: 2rem;
    height: 2rem;
    border: 1px solid color-mix(in srgb, var(--danger-color) 32%, transparent);
    border-radius: var(--border-radius-pill);
    background: color-mix(in srgb, var(--card-bg) 90%, transparent);
    color: var(--danger-color);
    cursor: pointer;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    z-index: 2;
}

.lib-card-delete-btn:hover {
    background: color-mix(in srgb, var(--danger-color) 12%, var(--card-bg) 88%);
}

/* Card body */
.lib-card-body {
    padding: 0.65rem;
    display: flex;
    flex-direction: column;
    gap: 0.35rem;
    flex: 1;
}
.lib-card-title {
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-semibold);
    color: var(--text-color);
    line-height: 1.3;
}

.lib-card-subject {
    font-size: 0.72rem;
    color: var(--text-muted);
}

.lib-card-actions {
    margin-top: auto;
}

.lib-card-open-btn {
    width: 100%;
    min-height: 2.35rem;
    padding: 0.55rem 0.75rem;
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    background: color-mix(in srgb, var(--card-bg) 80%, transparent);
    color: var(--text-muted);
    font: inherit;
    font-size: 0.72rem;
    font-weight: var(--font-weight-semibold);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.35rem;
    cursor: pointer;
    transition: color var(--transition-speed) ease,
                border-color var(--transition-speed) ease,
                background var(--transition-speed) ease;
}

.lib-card:hover .lib-card-open-btn,
.lib-card:focus-visible .lib-card-open-btn,
.lib-card-open-btn:hover {
    color: var(--accent-color);
    border-color: color-mix(in srgb, var(--accent-color) 45%, var(--border-color));
    background: color-mix(in srgb, var(--accent-color) 8%, var(--card-bg) 92%);
}

/* ---- Empty State ---- */
.library-empty {
    display: none;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 1rem;
    padding: 5rem 2rem;
    color: var(--text-muted);
    text-align: center;
}
.library-empty i {
    font-size: 2.8rem;
    opacity: 0.3;
    color: var(--accent-color);
}
.library-empty p {
    font-size: var(--font-size-sm);
    margin: 0;
    opacity: 0.6;
}

.add-manual-overlay,
.manual-choice-overlay {
    padding: 1.5rem;
}

.add-manual-modal,
.manual-choice-modal {
    width: min(100%, 640px);
    max-height: min(88vh, 860px);
    overflow-y: auto;
    background: var(--card-bg);
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow-modal);
    padding: 1.5rem;
    position: relative;
    border: 1px solid color-mix(in srgb, var(--border-color) 80%, transparent);
}

.add-manual-modal h2,
.manual-choice-modal h2 {
    margin: 0 3rem 0.35rem 0;
    color: var(--accent-color);
    font-size: var(--font-size-xl);
}

.manual-choice-modal p,
.add-manual-modal > p {
    color: var(--text-muted);
}

.add-manual-form {
    display: grid;
    gap: 1rem;
    margin-top: 1.25rem;
}

.form-group {
    display: grid;
    gap: 0.45rem;
}

.form-group label {
    font-size: var(--font-size-xs);
    font-weight: var(--font-weight-semibold);
    color: var(--text-muted);
}

.form-group input,
.form-group select {
    width: 100%;
    min-height: 3rem;
    padding: 0.7rem 0.9rem;
    border: 1.5px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    background: var(--input-bg);
    color: var(--text-color);
    font: inherit;
    box-sizing: border-box;
}

.form-group input:focus,
.form-group select:focus {
    outline: none;
    border-color: var(--accent-color);
    box-shadow: var(--focus-ring);
}

.source-toggle {
    display: flex;
    gap: 0.75rem;
}

.source-toggle-btn {
    flex: 1;
    min-height: 3rem;
    padding: 0.75rem 1rem;
    border-radius: var(--border-radius-sm);
    border: 1.5px solid var(--border-color);
    background: var(--highlight-color);
    color: var(--text-muted);
    font: inherit;
    font-weight: var(--font-weight-semibold);
    cursor: pointer;
    transition: transform var(--transition-speed) ease,
        border-color var(--transition-speed) ease,
        color var(--transition-speed) ease,
        background var(--transition-speed) ease;
}

.source-toggle-btn:hover,
.source-toggle-btn.active {
    border-color: var(--accent-color);
    background: color-mix(in srgb, var(--accent-color) 12%, var(--card-bg));
    color: var(--accent-color);
}

.source-toggle-btn:hover {
    transform: translateY(-1px);
}

.form-hint {
    margin: 0;
    font-size: var(--font-size-sm);
    color: var(--text-muted);
}

.form-actions {
    display: flex;
    align-items: center;
    gap: 0.75rem;
    flex-wrap: wrap;
}

.btn-primary,
.btn-secondary,
.manual-open-all-btn,
.manual-action-btn,
.manual-multi-summary {
    min-height: 2.85rem;
    border-radius: var(--border-radius-sm);
    font: inherit;
    font-weight: var(--font-weight-semibold);
    cursor: pointer;
    transition: transform var(--transition-speed) ease,
        box-shadow var(--transition-speed) ease,
        border-color var(--transition-speed) ease,
        background var(--transition-speed) ease,
        color var(--transition-speed) ease;
}

.btn-primary,
.manual-open-all-btn {
    border: none;
    background: var(--accent-color);
    color: var(--text-on-accent);
    padding: 0.75rem 1rem;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
}

.manual-open-all-btn-compact,
.manual-action-group-mobile .manual-action-btn,
.manual-action-group-mobile .manual-multi-summary {
    width: 100%;
}

.btn-secondary {
    border: 1.5px solid var(--border-color);
    background: transparent;
    color: var(--text-color);
    padding: 0.75rem 1rem;
}

.btn-primary:hover,
.btn-secondary:hover,
.manual-open-all-btn:hover,
.manual-action-btn:hover,
.manual-multi-summary:hover {
    transform: translateY(-2px);
    box-shadow: var(--box-shadow-hover);
}

.form-status {
    margin: 0;
    font-size: var(--font-size-sm);
    font-weight: var(--font-weight-semibold);
}

.form-status[data-tone="success"] {
    color: var(--success-color);
}

.form-status[data-tone="error"] {
    color: var(--danger-color);
}

.manual-choice-actions {
    display: grid;
    gap: 0.85rem;
    margin-top: 1.25rem;
}

.manual-action-group {
    display: flex;
    align-items: stretch;
    gap: 0.6rem;
    flex-wrap: wrap;
    margin-top: 0.85rem;
}

.manual-action-divider {
    display: inline-flex;
    align-items: center;
    color: var(--text-muted);
    font-weight: var(--font-weight-bold);
    opacity: 0.7;
}

.manual-action-btn {
    border: 1.5px solid color-mix(in srgb, var(--accent-color) 30%, var(--border-color));
    background: color-mix(in srgb, var(--card-bg) 92%, var(--accent-color) 8%);
    color: var(--text-color);
    padding: 0.6rem 0.75rem;
    display: inline-flex;
    align-items: center;
    gap: 0.65rem;
    text-align: left;
}

.manual-action-btn-primary {
    width: 100%;
}

.manual-action-visual {
    width: 2.25rem;
    height: 2.25rem;
    border-radius: var(--border-radius-sm);
    background: color-mix(in srgb, var(--accent-color) 14%, var(--card-bg));
    display: grid;
    place-items: center;
    flex-shrink: 0;
    overflow: hidden;
}

.manual-action-image {
    width: 100%;
    height: 100%;
    object-fit: cover;
}

.manual-action-icon {
    color: var(--accent-color);
    font-size: 1.1rem;
}

.manual-action-text {
    display: grid;
    gap: 0.15rem;
    min-width: 0;
}

.manual-action-title {
    color: var(--text-color);
    font-size: var(--font-size-sm);
    line-height: 1.2;
}

.manual-action-meta {
    color: var(--text-muted);
    font-size: var(--font-size-xs);
}

.manual-multi-summary {
    border: 1.5px dashed color-mix(in srgb, var(--accent-color) 28%, var(--border-color));
    background: transparent;
    color: var(--text-muted);
    padding: 0.75rem 1rem;
}

.recommended-manual-subject,
.mobile-recommended-subject,
.recommended-manual-placeholder {
    margin: 0;
    color: var(--text-color);
    font-weight: var(--font-weight-semibold);
}

/* ---- Mobile ---- */
@media (max-width: 600px) {
    .library-head { padding: 1rem 1rem 0.85rem; }
    .library-body { padding: 1rem; }

    .library-header-text h2 { font-size: var(--font-size-lg); }
    .library-header {
        align-items: flex-start;
    }
    .library-header-actions {
        width: 100%;
        justify-content: space-between;
        margin-left: 0;
    }
    .library-fab {
        flex: 1;
        justify-content: center;
    }

    .library-grid {
        grid-template-columns: repeat(auto-fill, minmax(105px, 1fr));
        gap: 0.85rem;
    }

    .library-toolbar {
        gap: 0.5rem;
    }

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

    .library-save-actions {
        flex-direction: column;
        align-items: stretch;
    }

    .source-toggle,
    .manual-action-group,
    .form-actions {
        flex-direction: column;
    }

    .manual-action-divider {
        display: none;
    }

    .add-manual-overlay,
    .manual-choice-overlay {
        padding: 0;
        align-items: flex-end;
    }

    .add-manual-modal,
    .manual-choice-modal {
        width: 100%;
        max-height: 85dvh;
        border-radius: 1.4rem 1.4rem 0 0;
        padding: 1.25rem 1rem calc(1.2rem + env(safe-area-inset-bottom));
    }

    /* On very small screens stack the search full-width */
    .library-search-wrap { min-width: 100%; }
    .library-content {
        height: 100vh;
        border-radius: 0;
    }
}