/* ==========================================================================
   PDF Merge Tool Styles — D3 Dev Tools
   ========================================================================== */

.pdf-merge-container {
    max-width: 1100px;
    margin: 0 auto;
}

/* ---- Upload Dropzone ---- */
.pdf-merge-dropzone {
    border: 2px dashed var(--color-border);
    border-radius: var(--radius-lg);
    background: var(--color-surface);
    padding: 3rem 1.5rem;
    text-align: center;
    cursor: pointer;
    transition: all 0.25s ease;
    box-shadow: var(--shadow-sm);
    position: relative;
}

.pdf-merge-dropzone:hover,
.pdf-merge-dropzone.drag-over {
    border-color: var(--color-accent);
    background: color-mix(in srgb, var(--color-accent) 6%, var(--color-surface));
    transform: translateY(-2px);
    box-shadow: var(--shadow-md);
}

.pdf-merge-dropzone__icon {
    width: 64px;
    height: 64px;
    border-radius: 50%;
    background: color-mix(in srgb, var(--color-accent) 12%, var(--color-surface));
    color: var(--color-accent);
    display: inline-flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    margin-bottom: 1rem;
    transition: transform 0.25s ease;
}

.pdf-merge-dropzone:hover .pdf-merge-dropzone__icon {
    transform: scale(1.1);
}

/* ---- Toolbar Above Grid ---- */
.pdf-merge-toolbar {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    gap: 0.75rem;
    padding: 0.75rem 1rem;
    background: var(--color-surface-elevated);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    margin-bottom: 1.25rem;
}

/* ---- Responsive Card Grid ---- */
.pdf-merge-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(185px, 1fr));
    gap: 1rem;
    margin-bottom: 1.5rem;
}

@media (max-width: 575.98px) {
    .pdf-merge-grid {
        grid-template-columns: repeat(auto-fill, minmax(145px, 1fr));
        gap: 0.75rem;
    }
}

/* ---- Individual Draggable PDF Card ---- */
.pdf-merge-card {
    position: relative;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    background: var(--color-surface);
    box-shadow: var(--shadow-xs);
    overflow: hidden;
    display: flex;
    flex-direction: column;
    cursor: grab;
    transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
    user-select: none;
    min-width: 0;
    max-width: 100%;
}

.pdf-merge-card:hover {
    box-shadow: var(--shadow-md);
    border-color: color-mix(in srgb, var(--color-accent) 40%, var(--color-border));
}

.pdf-merge-card.dragging {
    opacity: 0.45;
    transform: scale(0.96);
    border: 2px dashed var(--color-accent);
}

.pdf-merge-card.drag-target-left {
    box-shadow: -4px 0 0 0 var(--color-accent);
}

.pdf-merge-card.drag-target-right {
    box-shadow: 4px 0 0 0 var(--color-accent);
}

/* Position Badge */
.pdf-card-badge {
    position: absolute;
    top: 8px;
    left: 8px;
    z-index: 3;
    background: var(--color-accent);
    color: var(--color-accent-fg);
    font-size: 0.75rem;
    font-weight: 700;
    padding: 2px 7px;
    border-radius: 999px;
    box-shadow: 0 2px 6px rgba(0, 0, 0, 0.25);
}

/* Drag Handle */
.pdf-card-drag-handle {
    position: absolute;
    top: 8px;
    right: 8px;
    z-index: 3;
    background: color-mix(in srgb, var(--color-surface) 85%, transparent);
    backdrop-filter: blur(4px);
    border: 1px solid var(--color-border);
    color: var(--color-fg-muted);
    font-size: 0.9rem;
    width: 26px;
    height: 26px;
    border-radius: 6px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: grab;
    transition: all 0.15s ease;
}

.pdf-card-drag-handle:hover {
    color: var(--color-accent);
    background: var(--color-surface);
}

/* Thumbnail Area */
.pdf-thumbnail-wrap {
    position: relative;
    height: 175px;
    background: color-mix(in srgb, var(--color-surface-elevated) 70%, var(--color-surface));
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 10px;
    overflow: hidden;
}

@media (max-width: 575.98px) {
    .pdf-thumbnail-wrap {
        height: 140px;
    }
}

.pdf-thumbnail-canvas {
    max-height: 100%;
    max-width: 100%;
    object-fit: contain;
    border-radius: 4px;
    box-shadow: 0 3px 10px rgba(0, 0, 0, 0.15);
    background: #ffffff;
}

.pdf-thumbnail-fallback {
    font-size: 3rem;
    color: var(--color-danger);
    opacity: 0.8;
}

.pdf-page-count-badge {
    position: absolute;
    bottom: 6px;
    right: 6px;
    background: rgba(18, 10, 30, 0.82);
    color: #ffffff;
    font-size: 0.72rem;
    font-weight: 600;
    padding: 2px 6px;
    border-radius: 4px;
    backdrop-filter: blur(2px);
}

/* Card Details */
.pdf-card-meta {
    padding: 0.65rem 0.75rem;
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
    flex: 1;
    min-width: 0;
    overflow: hidden;
}

.pdf-card-title {
    font-size: 0.85rem;
    font-weight: 600;
    color: var(--color-fg);
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    min-width: 0;
    max-width: 100%;
}

.pdf-card-details {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 0.75rem;
    color: var(--color-fg-muted);
}

/* Card Action Buttons */
.pdf-card-actions {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.35rem;
    margin-top: auto;
    padding-top: 0.4rem;
    border-top: 1px solid var(--color-border);
}

.pdf-card-btn {
    padding: 0.25rem 0.45rem;
    font-size: 0.75rem;
    border-radius: 4px;
    line-height: 1;
}

/* Result Card */
.pdf-merge-result {
    display: none;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    background: var(--color-surface);
    box-shadow: var(--shadow-md);
    padding: 2.5rem 1.5rem;
    text-align: center;
    margin-top: 1.5rem;
}

.pdf-merge-result.show {
    display: block;
    animation: fadeInScale 0.3s ease;
}

@keyframes fadeInScale {
    from {
        opacity: 0;
        transform: scale(0.97);
    }
    to {
        opacity: 1;
        transform: scale(1);
    }
}

@media (max-width: 575.98px) {
    .pdf-merge-dropzone {
        padding: 2rem 0.75rem;
    }

    .pdf-merge-toolbar {
        padding: 0.75rem;
        flex-direction: column;
        align-items: stretch;
        text-align: center;
        gap: 0.6rem;
    }

    .pdf-merge-toolbar .d-flex {
        justify-content: center;
        width: 100%;
        flex-wrap: wrap;
    }

    .pdf-merge-result {
        padding: 1.75rem 0.75rem;
    }
}