/* ── Reading List Panel ── */

.reading-list-rail {
    display: flex;
    align-items: stretch;
    flex-shrink: 0;
    min-height: 0;
    height: 100%;
}

.reading-list-rail-divider {
    width: 0;
    flex-shrink: 0;
    position: relative;
}

.reading-list-rail-divider::before {
    content: '';
    position: absolute;
    top: 0;
    bottom: 0;
    left: 0;
    width: 1px;
    background: var(--surface-subtle);
}

.reading-list-panel {
    width: 320px;
    min-width: 280px;
    max-width: 420px;
    height: 100%;
    background: var(--surface-panel);
    border-left: 2px solid rgba(240, 192, 64, 0.2);
    display: flex;
    flex-direction: column;
    overflow: hidden;
    font-family: var(--font-mono);
}

.reading-list-panel.collapsed .reading-list-body {
    display: none;
}

/* ── Collapsed strip ── */
.reading-list-strip {
    appearance: none;
    width: 36px;
    border: none;
    border-left: 1px solid var(--border-subtle);
    background: var(--surface-header);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: flex-start;
    gap: 6px;
    padding: 14px 6px;
    cursor: pointer;
    text-align: center;
    transition: background 0.12s ease;
}

.reading-list-strip:hover {
    background: var(--surface-subtle);
}

.reading-list-strip-count {
    font-size: 11px;
    font-weight: 600;
    color: var(--gem-topaz);
    font-family: var(--font-mono);
}

.reading-list-strip-label {
    font-size: 9px;
    letter-spacing: 0.8px;
    text-transform: uppercase;
    color: var(--gem-topaz);
    writing-mode: vertical-rl;
    text-orientation: mixed;
    font-family: var(--font-mono);
    opacity: 0.4;
    font-weight: 600;
}

/* ── Panel header ── */
.reading-list-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 14px 16px 12px;
    background: transparent;
    color: var(--primary-text);
    flex-shrink: 0;
    user-select: none;
    border-bottom: 1px solid var(--border-subtle);
}

.reading-list-title {
    font-size: 9px;
    font-weight: 600;
    letter-spacing: 1.2px;
    text-transform: uppercase;
    font-family: var(--font-mono);
    color: var(--gem-topaz);
    opacity: 0.6;
}

.reading-list-title::before {
    content: '';
}

.reading-list-controls {
    display: flex;
    align-items: center;
    gap: 8px;
}

.reading-list-count {
    font-size: 10px;
    background: var(--surface-subtle);
    color: var(--gem-topaz);
    padding: 2px 7px;
    border-radius: 3px;
    border: none;
    min-width: 18px;
    text-align: center;
    font-family: var(--font-mono);
    font-weight: 600;
}

.reading-list-toggle-btn {
    background: none;
    border: none;
    color: var(--secondary-text);
    cursor: pointer;
    padding: 4px;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0.4;
    transition: opacity 0.15s, color 0.15s;
    font-family: var(--font-mono);
    font-size: 14px;
}

.reading-list-toggle-btn:hover {
    opacity: 1;
    color: var(--gem-topaz);
}

/* ── Panel body ── */
.reading-list-body {
    flex: 1;
    overflow-y: auto;
    padding: 0;
}

/* ── Sections ── */
#reading-list-rail .reading-list-section {
    border-bottom: 1px solid var(--surface-raised);
}

#reading-list-rail .reading-list-section:last-child {
    border-bottom: none;
}

#reading-list-rail .reading-list-section-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 8px;
    padding: 10px 16px;
    font-size: 9px;
    font-weight: 600;
    letter-spacing: 1px;
    text-transform: uppercase;
    color: var(--secondary-text);
    background: transparent;
    font-family: var(--font-mono);
    opacity: 0.6;
}

#reading-list-rail .reading-list-section-header span:first-child::before {
    content: '';
}

#reading-list-rail .reading-list-section-header span:first-child::after {
    content: '';
}

#reading-list-rail .reading-list-section-summary {
    cursor: pointer;
    list-style: none;
}

#reading-list-rail .reading-list-section-summary::-webkit-details-marker {
    display: none;
}

#reading-list-rail .reading-list-section-earlier[open] .reading-list-section-summary {
    border-bottom: 1px solid var(--surface-raised);
}

#reading-list-rail .reading-list-section-count {
    font-size: 10px;
    font-weight: 600;
    color: var(--gem-sapphire);
    background: rgba(74, 144, 217, 0.08);
    border: none;
    border-radius: 3px;
    min-width: 16px;
    padding: 1px 6px;
    text-align: center;
    font-family: var(--font-mono);
}

/* ── Source link ── */
.reading-list-source {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
    padding: 8px 16px;
    border-bottom: 1px solid var(--surface-raised);
    background: transparent;
}

.reading-list-source-label {
    font-size: 11px;
    color: var(--secondary-text);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    font-family: var(--font-mono);
}

.reading-list-source-link {
    flex-shrink: 0;
    font-size: 10px;
    font-weight: 500;
    color: var(--gem-sapphire);
    text-decoration: none;
    border-bottom: 1px solid rgba(74, 144, 217, 0.3);
    font-family: var(--font-mono);
    transition: color 0.12s, border-color 0.12s;
}

.reading-list-source-link:hover {
    color: #3A7BC0;
    border-bottom-color: #3A7BC0;
}

/* ── Empty state ── */
.reading-list-empty {
    padding: 28px 16px;
    text-align: left;
    color: var(--secondary-text);
    font-size: 11px;
    font-style: normal;
    font-family: var(--font-mono);
    opacity: 0.5;
}

.reading-list-empty p {
    margin-bottom: 4px;
}

.reading-list-empty::before {
    content: '—';
    display: inline;
    font-size: inherit;
    opacity: 0.5;
    margin-right: 6px;
    font-style: normal;
    color: var(--secondary-text);
}

.reading-list-hint {
    font-size: 10px;
    opacity: 0.5;
    padding-left: 16px;
}

/* ── Reading List Items ── */
.reading-list-item {
    display: flex;
    align-items: flex-start;
    gap: 8px;
    padding: 10px 14px;
    margin: 0 6px;
    border-radius: 5px;
    border-bottom: 1px solid var(--border-subtle);
    transition: background 0.12s;
    position: relative;
}

.reading-list-item + .reading-list-item {
    margin-top: 0;
}

.reading-list-item:last-child {
    border-bottom: none;
}

#reading-list-rail .reading-list-item-controls {
    display: flex;
    align-items: center;
    gap: 4px;
    flex-shrink: 0;
}

#reading-list-rail .reading-list-checkbox-placeholder {
    width: 14px;
    height: 14px;
    display: inline-block;
}

.reading-list-item:hover {
    background: var(--surface-subtle);
}

/* Current item — bottom accent bar */
.reading-list-item.is-current {
    background: rgba(74, 144, 217, 0.06);
}

.reading-list-item.is-current::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 10px;
    right: 10px;
    height: 2px;
    background: var(--gem-sapphire);
    border-radius: 1px;
}

.reading-list-item.is-current .reading-list-item-title {
    color: var(--primary-text);
    font-weight: 600;
}

.reading-list-item.is-read {
    opacity: 0.55;
}

.reading-list-item.is-read .reading-list-item-title {
    text-decoration: line-through;
    text-decoration-color: var(--secondary-text);
}

/* ── Checkbox ── */
.reading-list-checkbox {
    appearance: none;
    -webkit-appearance: none;
    width: 15px;
    height: 15px;
    margin-top: 1px;
    margin-right: 0;
    cursor: pointer;
    flex-shrink: 0;
    border: 1.5px solid rgba(74, 144, 217, 0.3);
    border-radius: 3px;
    background: var(--surface-hover);
    transition: all 0.12s ease;
    position: relative;
}

.reading-list-checkbox:hover {
    border-color: var(--gem-sapphire);
}

.reading-list-checkbox:checked {
    background: rgba(74, 144, 217, 0.1);
    border-color: var(--gem-sapphire);
}

.reading-list-checkbox:checked::after {
    content: '×';
    position: absolute;
    left: 2px;
    top: -2px;
    font-size: 12px;
    line-height: 1;
    color: var(--gem-sapphire);
    font-family: var(--font-mono);
    font-weight: 700;
    border: none;
    width: auto;
    height: auto;
    transform: none;
}

.reading-list-checkbox:focus-visible {
    outline: 1px solid var(--gem-sapphire);
    outline-offset: 1px;
}

/* ── Pin button ── */
#reading-list-rail .reading-list-pin-btn {
    width: 16px;
    height: 16px;
    border: none;
    background: transparent;
    color: rgba(240, 192, 64, 0.3);
    font-size: 12px;
    line-height: 1;
    cursor: pointer;
    padding: 0;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    transition: color 0.12s;
    font-family: var(--font-mono);
}

#reading-list-rail .reading-list-pin-btn:hover {
    color: var(--gem-topaz);
}

#reading-list-rail .reading-list-pin-btn.is-pinned {
    color: var(--gem-topaz);
}

/* Pinned items — subtle topaz bg tint */
.reading-list-item:has(.reading-list-pin-btn.is-pinned) {
    background: rgba(240, 192, 64, 0.04);
}

/* ── Item link + content ── */
.reading-list-link {
    flex: 1;
    text-decoration: none;
    color: inherit;
    min-width: 0;
    cursor: pointer;
    display: block;
}

.reading-list-link::after {
    content: '→';
    opacity: 0;
    transition: opacity 0.12s;
    margin-left: 6px;
    float: right;
    color: var(--secondary-text);
}

.reading-list-item:hover .reading-list-link::after {
    opacity: 0.4;
}

.reading-list-item-title {
    font-size: 11px;
    color: var(--primary-text);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    min-width: 0;
    font-family: var(--font-mono);
    font-weight: 400;
}

.reading-list-item-main {
    min-width: 0;
}

.reading-list-item-top {
    display: flex;
    align-items: center;
    gap: 6px;
    min-width: 0;
}

#reading-list-rail .reading-list-item-preview {
    margin-top: 4px;
    font-size: 12px;
    line-height: 1.5;
    color: var(--primary-text);
    display: -webkit-box;
    overflow: hidden;
    -webkit-line-clamp: 3;
    -webkit-box-orient: vertical;
    font-family: var(--font-mono);
    opacity: 0.8;
}

/* ── Type badges — gem colored ── */
.reading-list-type-badge {
    flex-shrink: 0;
    font-size: 9px;
    font-weight: 600;
    text-transform: lowercase;
    letter-spacing: 0.2px;
    padding: 1px 5px;
    border-radius: 3px;
    border: none;
    font-family: var(--font-mono);
}

.reading-list-type-badge[data-type="supports"] {
    color: var(--gem-emerald);
    background: rgba(46, 196, 122, 0.08);
}

.reading-list-type-badge[data-type="supports"]::before {
    content: '+';
    margin-right: 1px;
    opacity: 0.6;
}

.reading-list-type-badge[data-type="challenges"] {
    color: var(--gem-ruby);
    background: rgba(230, 57, 70, 0.08);
}

.reading-list-type-badge[data-type="challenges"]::before {
    content: '!';
    margin-right: 1px;
    opacity: 0.6;
}

.reading-list-type-badge[data-type="deepens"] {
    color: var(--gem-sapphire);
    background: rgba(74, 144, 217, 0.08);
}

.reading-list-type-badge[data-type="deepens"]::before {
    content: '»';
    margin-right: 1px;
    opacity: 0.6;
}

.reading-list-type-badge[data-type="context"] {
    color: var(--gem-topaz);
    background: var(--surface-subtle);
}

.reading-list-type-badge[data-type="context"]::before {
    content: '~';
    margin-right: 1px;
    opacity: 0.6;
}

/* ── Item reason ── */
.reading-list-item-reason {
    display: none;
}

.reading-list-error {
    padding: 12px 16px;
    color: var(--gem-ruby);
    font-size: 11px;
    text-align: left;
    font-family: var(--font-mono);
}

.reading-list-error::before {
    content: 'error: ';
    font-weight: 600;
    opacity: 0.7;
}

/* ── Citation highlight animation ── */
.reading-list-item.citation-highlight {
    animation: citation-pulse 2s ease-out;
}

@keyframes citation-pulse {
    0%, 100% {
        background: transparent;
    }
    20%, 60% {
        background: rgba(74, 144, 217, 0.08);
        background: rgba(74, 144, 217, 0.06);
    }
}

/* ── Citation links in assistant messages ── */
.citation-link {
    color: var(--gem-sapphire);
    text-decoration: none;
    font-weight: 600;
    cursor: pointer;
    transition: color 0.12s, background-color 0.12s;
    padding: 0 2px;
    border-radius: 2px;
    position: relative;
    font-family: var(--font-mono);
}

.citation-link:hover {
    background-color: rgba(74, 144, 217, 0.1);
    color: #3A7BC0;
}

/* ── Citation tooltip ── */
.citation-tooltip {
    position: fixed;
    z-index: 1000;
    background: var(--surface-input);
    color: var(--primary-text);
    padding: 8px 12px;
    border-radius: 4px;
    border: 1px solid var(--border-medium);
    font-size: 11px;
    font-weight: 400;
    max-width: 260px;
    box-shadow: 0 4px 16px rgba(0, 0, 0, 0.5);
    pointer-events: none;
    opacity: 0;
    transform: translateY(3px);
    transition: opacity 0.12s ease, transform 0.12s ease;
    font-family: var(--font-mono);
}

.citation-tooltip.visible {
    opacity: 1;
    transform: translateY(0);
}

.citation-tooltip-book {
    font-weight: 600;
    color: var(--gem-topaz);
    margin-bottom: 2px;
}

.citation-tooltip-passage {
    opacity: 0.5;
    font-size: 10px;
    color: var(--secondary-text);
}