.preview-panel {
    position: relative;
    min-width: 0;
    min-height: 620px;
    padding: 18px;
    background: #f5f7fb;
}

.preview-panel__add {
    position: absolute;
    top: 14px;
    right: 14px;
    min-height: 34px;
    padding: 0 12px;
    display: inline-flex;
    align-items: center;
    gap: 8px;
    border: 1px solid rgba(34, 31, 26, 0.08);
    border-radius: 999px;
    background: #ffffff;
    color: var(--text);
    font-size: 0.84rem;
    font-weight: 700;
    cursor: pointer;
    z-index: 2;
}

.preview-panel__add:hover {
    border-color: rgba(239, 75, 55, 0.24);
    background: #fffaf8;
}

.preview-panel__add-plus {
    font-size: 1rem;
    line-height: 1;
    color: var(--brand);
}

.preview-panel__empty,
.preview-panel__loading,
.preview-panel__error {
    display: none !important;
}

.preview-panel__canvas {
    display: grid;
    align-content: start;
    gap: 10px;
    min-height: 100%;
}

.preview-panel__meta {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    padding-right: 80px;
}

.preview-panel__meta:empty {
    display: none;
}

.preview-panel__meta span {
    display: inline-flex;
    align-items: center;
    min-height: 26px;
    padding: 0 10px;
    border-radius: 999px;
    border: 1px solid rgba(34, 31, 26, 0.08);
    background: #ffffff;
    color: var(--text-soft);
    font-size: 0.74rem;
    font-weight: 700;
}

.pdf-preview-grid,
.pdf-preview-doc__grid {
    display: flex;
    gap: 12px;
    overflow-x: auto;
    overflow-y: hidden;
    padding: 4px 2px 8px;
    scroll-snap-type: x proximity;
    -webkit-overflow-scrolling: touch;
}

.pdf-preview-grid:empty {
    display: none;
}

.pdf-preview-grid::-webkit-scrollbar,
.pdf-preview-doc__grid::-webkit-scrollbar {
    height: 10px;
}

.pdf-preview-grid::-webkit-scrollbar-thumb,
.pdf-preview-doc__grid::-webkit-scrollbar-thumb {
    background: rgba(34, 31, 26, 0.14);
    border-radius: 999px;
}

.pdf-preview-doc {
    display: grid;
    gap: 10px;
}

.pdf-preview-doc--group {
    width: 100%;
}

.pdf-preview-doc__head {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 10px;
}

.pdf-preview-doc__title {
    font-size: 0.92rem;
    line-height: 1.24;
    color: var(--text);
    word-break: break-word;
}

.pdf-preview-doc__meta {
    color: var(--text-faint);
    font-size: 0.76rem;
    font-weight: 700;
    white-space: nowrap;
}

.pdf-preview-thumb {
    position: relative;
    flex: 0 0 122px;
    display: grid;
    justify-items: center;
    align-content: start;
    gap: 8px;
    padding: 8px;
    border-radius: 10px;
    border: 1px solid rgba(34, 31, 26, 0.08);
    background: #ffffff;
    transition: border-color var(--transition), background var(--transition), box-shadow var(--transition);
    scroll-snap-align: start;
}

.pdf-preview-thumb:hover {
    border-color: rgba(239, 75, 55, 0.24);
    box-shadow: 0 4px 14px rgba(17, 24, 39, 0.06);
}

.pdf-preview-thumb canvas {
    width: 100%;
    height: auto;
    aspect-ratio: 0.72;
    object-fit: contain;
    display: block;
    border-radius: 4px;
    background: #ffffff;
    border: 1px solid rgba(34, 31, 26, 0.06);
}

.pdf-preview-thumb__number {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    min-height: 20px;
    padding: 0 6px;
    border-radius: 999px;
    color: var(--text-soft);
    font-size: 0.72rem;
    font-weight: 700;
}

.pdf-preview-thumb__name {
    width: 100%;
    color: var(--text-soft);
    font-size: 0.76rem;
    text-align: center;
    line-height: 1.35;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.pdf-preview-thumb--selectable,
.pdf-preview-thumb--document {
    cursor: pointer;
}

.pdf-preview-thumb--document.is-active,
.pdf-preview-thumb.is-selected {
    border-color: rgba(239, 75, 55, 0.42);
    background: #fff8f5;
    box-shadow: 0 0 0 2px rgba(239, 75, 55, 0.08);
}

.pdf-preview-thumb.is-selected .pdf-preview-thumb__number {
    color: var(--brand);
}

.pdf-preview-thumb__remove {
    position: absolute;
    top: 6px;
    right: 6px;
    width: 22px;
    height: 22px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border: 0;
    border-radius: 999px;
    background: rgba(17, 24, 39, 0.68);
    color: #ffffff;
    font-size: 0.8rem;
    line-height: 1;
    cursor: pointer;
    opacity: 0;
    transition: opacity var(--transition), background var(--transition);
}

.pdf-preview-thumb:hover .pdf-preview-thumb__remove,
.pdf-preview-thumb:focus-within .pdf-preview-thumb__remove {
    opacity: 1;
}

.pdf-preview-thumb__remove:hover {
    background: var(--brand);
}

html[data-theme='dark'] .preview-panel {
    background: #111723;
}

html[data-theme='dark'] .preview-panel__meta span,
html[data-theme='dark'] .pdf-preview-thumb {
    background: rgba(255, 255, 255, 0.04);
}

html[data-theme='dark'] .pdf-preview-thumb canvas {
    background: #ffffff;
}

@media (max-width: 640px) {
    .preview-panel {
        min-height: 0;
        padding: 14px;
    }

    .preview-panel__add {
        top: 10px;
        right: 10px;
    }

    .preview-panel__meta {
        padding-right: 0;
        margin-top: 32px;
    }

    .pdf-preview-thumb {
        flex-basis: 112px;
    }
}