.pdf-tool-drop {
    border: 1px dashed var(--bs-border-color);
    border-radius: 8px;
    padding: 24px;
    text-align: center;
    background: var(--bs-tertiary-bg);
    cursor: pointer;
    transition: border-color .15s ease, background-color .15s ease;
}

.pdf-tool-drop.drag-over {
    border-color: var(--bs-primary);
    background: rgba(var(--bs-primary-rgb), .08);
}

.pdf-tool-file-list,
.pdf-tool-result-list,
.pdf-page-list {
    display: grid;
    gap: 10px;
}

.pdf-tool-file-item,
.pdf-tool-result-item,
.pdf-page-item {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    border: 1px solid var(--bs-border-color);
    border-radius: 8px;
    padding: 10px 12px;
    background: var(--bs-body-bg);
}

.pdf-tool-file-name,
.pdf-tool-result-name {
    min-width: 0;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.pdf-tool-file-meta,
.pdf-tool-muted {
    color: var(--bs-secondary-color);
    font-size: 12px;
}

.pdf-merge-orientation {
    display: grid;
    grid-template-columns: auto minmax(132px, 170px);
    align-items: center;
    gap: 8px;
    margin-left: auto;
}

.pdf-tool-controls {
    border: 1px solid var(--bs-border-color);
    border-radius: 8px;
    padding: 14px;
    background: var(--bs-body-bg);
}

.pdf-page-list {
    grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
}

.pdf-page-item {
    align-items: stretch;
    flex-direction: column;
    cursor: grab;
}

.pdf-page-item.is-dragging {
    opacity: .55;
}

.pdf-page-label {
    font-weight: 600;
}

.pdf-page-actions {
    display: flex;
    gap: 6px;
}

.pdf-page-actions .btn {
    flex: 1 1 0;
}

.pdf-tool-preview-frame {
    width: 100%;
    min-height: 220px;
    border: 1px solid var(--bs-border-color);
    border-radius: 8px;
    background: #fff;
}

.pdf-preview-panel {
    border: 1px solid #dbe3ea;
    border-radius: 12px;
    overflow: hidden;
    background: #ffffff;
    box-shadow: 0 12px 28px rgba(15, 23, 42, .08);
}

.pdf-preview-head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    padding: 14px 16px;
    border-bottom: 1px solid #e2e8f0;
    background: linear-gradient(180deg, #ffffff, #f8fafc);
    color: #0f172a;
}

.pdf-preview-head .pdf-tool-muted {
    color: #64748b;
}

.pdf-preview-head .btn {
    border-color: #cbd5e1;
    color: #334155;
}

.pdf-preview-head .btn:hover {
    background: #f1f5f9;
    color: #0f172a;
}

.pdf-preview-body {
    position: relative;
    min-height: 520px;
    overflow: auto;
    background:
        linear-gradient(45deg, rgba(148, 163, 184, .13) 25%, transparent 25%),
        linear-gradient(-45deg, rgba(148, 163, 184, .13) 25%, transparent 25%),
        linear-gradient(45deg, transparent 75%, rgba(148, 163, 184, .13) 75%),
        linear-gradient(-45deg, transparent 75%, rgba(148, 163, 184, .13) 75%),
        #f8fafc;
    background-position: 0 0, 0 10px, 10px -10px, -10px 0;
    background-size: 20px 20px;
}

.pdf-preview-empty {
    display: flex;
    align-items: center;
    justify-content: center;
    min-height: 520px;
    color: #64748b;
}

.pdf-preview-pages {
    display: grid;
    justify-items: center;
    gap: 22px;
    min-height: 520px;
    padding: 28px 16px;
}

.pdf-preview-page {
    position: relative;
    max-width: min(100%, 920px);
}

.pdf-preview-page.can-drag {
    cursor: grab;
    transition: transform .15s ease, box-shadow .15s ease, opacity .15s ease;
}

.pdf-preview-page.can-drag.is-dragging {
    opacity: .58;
    cursor: grabbing;
    transform: scale(.985);
}

.pdf-preview-page.can-drag.is-drag-over canvas {
    box-shadow: 0 16px 36px rgba(59, 130, 246, .24);
    outline: 2px solid rgba(59, 130, 246, .55);
}

.pdf-preview-page canvas {
    display: block;
    max-width: 100%;
    height: auto;
    border-radius: 4px;
    background: #fff;
    box-shadow: 0 14px 32px rgba(15, 23, 42, .16);
}

.pdf-preview-page-label {
    position: absolute;
    top: 10px;
    left: 10px;
    border-radius: 999px;
    padding: 3px 9px;
    background: rgba(255, 255, 255, .92);
    color: #334155;
    box-shadow: 0 2px 8px rgba(15, 23, 42, .12);
    font-size: 12px;
}

.pdf-preview-rotate-btn,
.pdf-jpg-rotate-btn {
    position: absolute;
    top: 10px;
    right: 10px;
    z-index: 2;
    border: 1px solid rgba(148, 163, 184, .45);
    border-radius: 999px;
    padding: 4px 10px;
    background: rgba(255, 255, 255, .94);
    color: #0f172a;
    box-shadow: 0 6px 18px rgba(15, 23, 42, .14);
    font-size: 12px;
    line-height: 1.2;
    cursor: pointer;
    transition: transform .15s ease, box-shadow .15s ease, border-color .15s ease;
}

.pdf-preview-rotate-btn:hover,
.pdf-jpg-rotate-btn:hover {
    border-color: rgba(59, 130, 246, .55);
    box-shadow: 0 8px 22px rgba(15, 23, 42, .18);
    transform: translateY(-1px);
}

.pdf-preview-more {
    border-radius: 999px;
    padding: 6px 12px;
    background: #ffffff;
    color: #475569;
    box-shadow: 0 2px 8px rgba(15, 23, 42, .12);
    font-size: 12px;
}

.pdf-jpg-preview-head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 12px;
    border: 1px solid rgba(148, 163, 184, .35);
    border-radius: 10px;
    padding: 14px 16px;
    background: linear-gradient(180deg, #ffffff, #f8fafc);
}

.pdf-jpg-summary {
    flex: 0 0 auto;
    max-width: 52%;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    color: var(--bs-secondary-color);
    font-size: 12px;
}

.pdf-jpg-preview-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(210px, 1fr));
    gap: 16px;
}

.pdf-jpg-preview-card {
    border: 1px solid rgba(148, 163, 184, .35);
    border-radius: 12px;
    overflow: hidden;
    background: #fff;
    box-shadow: 0 10px 24px rgba(15, 23, 42, .08);
    cursor: grab;
    transition: border-color .15s ease, box-shadow .15s ease, opacity .15s ease, transform .15s ease;
}

.pdf-jpg-preview-card.is-dragging {
    opacity: .58;
    cursor: grabbing;
    transform: scale(.985);
}

.pdf-jpg-preview-card.is-drag-over {
    border-color: rgba(59, 130, 246, .7);
    box-shadow: 0 14px 32px rgba(59, 130, 246, .18);
}

.pdf-jpg-page-preview {
    position: relative;
    display: flex;
    align-items: center;
    justify-content: center;
    width: calc(100% - 24px);
    margin: 12px auto 0;
    border: 1px solid rgba(148, 163, 184, .34);
    border-radius: 8px;
    background:
        linear-gradient(45deg, rgba(148, 163, 184, .16) 25%, transparent 25%),
        linear-gradient(-45deg, rgba(148, 163, 184, .16) 25%, transparent 25%),
        linear-gradient(45deg, transparent 75%, rgba(148, 163, 184, .16) 75%),
        linear-gradient(-45deg, transparent 75%, rgba(148, 163, 184, .16) 75%),
        #f8fafc;
    background-position: 0 0, 0 8px, 8px -8px, -8px 0;
    background-size: 16px 16px;
}

.pdf-jpg-page-preview.portrait {
    aspect-ratio: 3 / 4;
}

.pdf-jpg-page-preview.landscape {
    aspect-ratio: 4 / 3;
}

.pdf-jpg-page-preview img {
    max-width: 78%;
    max-height: 78%;
    object-fit: contain;
    border-radius: 3px;
    box-shadow: 0 8px 18px rgba(15, 23, 42, .18);
    transition: transform .16s ease;
}

.pdf-jpg-rotation-badge {
    position: absolute;
    left: 10px;
    bottom: 10px;
    border-radius: 999px;
    padding: 3px 8px;
    background: rgba(255, 255, 255, .92);
    color: #475569;
    box-shadow: 0 2px 8px rgba(15, 23, 42, .12);
    font-size: 12px;
}

.pdf-jpg-card-body {
    display: grid;
    gap: 8px;
    padding: 10px 12px 12px;
}

.pdf-jpg-card-actions {
    width: 100%;
}

.pdf-jpg-card-actions .btn {
    min-width: 0;
    padding-right: 6px;
    padding-left: 6px;
}

@media (max-width: 576px) {
    .pdf-tool-file-item,
    .pdf-tool-result-item {
        align-items: flex-start;
        flex-direction: column;
    }

    .pdf-merge-orientation {
        grid-template-columns: 1fr;
        width: 100%;
        margin-left: 0;
    }

    .pdf-jpg-preview-head {
        align-items: flex-start;
        flex-direction: column;
    }

    .pdf-jpg-summary {
        max-width: 100%;
        white-space: normal;
    }

    .pdf-preview-head {
        align-items: flex-start;
        flex-direction: column;
    }

    .pdf-preview-body,
    .pdf-preview-empty,
    .pdf-preview-pages {
        min-height: 360px;
    }

    .pdf-preview-pages {
        padding: 18px 10px;
    }
}