/* ============================================
   PDF Splitter — Stylesheet
   Uses shared theme.css design tokens.
   Mirrors the mdv/jsv app-shell pattern.
   ============================================ */

/* Default accent for PDF Explorer when no specific color-theme is set */
:root:not([data-color-theme]) {
    --accent: rgb(239, 68, 68);
    --accent-hover: rgb(220, 38, 38);
    --accent-muted: rgb(45, 20, 20);
    --accent-text: rgb(248, 113, 113);
}

/* ── Iframe Embed Mode ──────────────────────────────── */
body.iframe-mode .app-header-row {
    display: none !important;
}

body.iframe-mode #file-info-panel {
    display: none !important;
}

body.iframe-mode #sidebar {
    display: flex !important;
    transition: width var(--transition-slow), min-width var(--transition-slow);
}

body.iframe-mode #sidebar.iframe-sidebar-collapsed {
    display: flex !important;
    width: 0 !important;
    min-width: 0 !important;
    overflow: hidden;
}

/* ── Upload Area ── */
.upload-area {
    border: 2px dashed var(--border-default);
    border-radius: var(--radius-xl);
    padding: 4rem 2rem;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s ease;
    margin: auto;
    max-width: 600px;
    width: 100%;
}

.upload-area:hover,
.upload-area.drag-over {
    border-color: var(--accent);
    background: var(--accent-muted);
}

.upload-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
    display: block;
}

.upload-text {
    font-size: 1.1rem;
    color: var(--text-secondary);
}

.upload-text b {
    color: var(--accent);
}

#file-input {
    display: none;
}

/* ── File Info (inside sidebar panel) ── */
.file-info {
    display: none;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-2);
    padding: var(--space-3);
    border-radius: var(--radius-md);
    background: var(--bg-surface-raised);
    border: 1px solid var(--border-subtle);
    animation: fadeIn 0.4s ease;
}

.file-info.empty-placeholder {
    display: block;
    background: transparent;
    border: none;
    color: var(--text-tertiary);
    font-style: italic;
    font-size: var(--font-size-xs);
    text-align: center;
    padding: var(--space-6) var(--space-2);
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.file-details {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    min-width: 0;
}

.file-icon {
    font-size: 1.5rem;
}

.file-name {
    font-weight: 600;
    color: var(--text-primary);
    max-width: 180px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    font-size: var(--font-size-sm);
}

.file-meta,
.range-hint {
    color: var(--text-tertiary);
    font-size: var(--font-size-xs);
}

.badge {
    background: var(--accent-muted);
    color: var(--accent);
    padding: 0.25rem 0.75rem;
    border-radius: 99px;
    font-size: var(--font-size-sm);
    font-weight: 600;
    border: 1px solid var(--accent-muted);
}

.badge-ghost {
    background: transparent;
    color: var(--text-tertiary);
    padding: 0.25rem 0.5rem;
    font-size: var(--font-size-xs);
    border: none;
}

/* ── Range List (inside sidebar panel) ── */
.range-list {
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
    padding: var(--space-2);
    overflow-y: auto;
    flex: 1;
}

.range-item {
    display: grid;
    grid-template-columns: 1fr auto auto;
    align-items: center;
    gap: var(--space-2);
    padding: var(--space-2);
    border-radius: var(--radius-md);
    background: var(--bg-surface-raised);
    border: 1px solid var(--border-subtle);
    animation: slideIn 0.3s ease;
}

@keyframes slideIn {
    from { opacity: 0; transform: translateX(-10px); }
    to { opacity: 1; transform: translateX(0); }
}

.range-input {
    width: 100%;
    background: var(--bg-root);
    border: 1px solid var(--border-default);
    border-radius: var(--radius-sm);
    padding: 6px 10px;
    color: var(--text-primary);
    font-size: var(--font-size-sm);
    font-family: var(--font-mono);
    outline: none;
    transition: border-color var(--transition-fast);
    min-width: 0;
}

.range-input:focus {
    border-color: var(--accent);
}

.range-input.invalid {
    border-color: var(--danger);
}

.range-download-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 4px;
    padding: 6px 10px;
    border-radius: var(--radius-sm);
    font-size: var(--font-size-xs);
    font-weight: 600;
    background: var(--bg-surface-hover);
    color: var(--text-tertiary);
    border: 1px solid var(--border-subtle);
    cursor: pointer;
    transition: all var(--transition-fast);
    opacity: 0.6;
    text-decoration: none;
}

.range-download-btn:hover {
    opacity: 0.85;
    border-color: var(--border-strong);
}

.range-download-btn.active {
    opacity: 1;
    background: var(--accent);
    color: #fff;
    border-color: var(--accent);
}

.range-download-btn.active:hover {
    background: var(--accent-hover);
    border-color: var(--accent-hover);
}

.range-remove-btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    padding: 6px;
    border-radius: var(--radius-sm);
    background: transparent;
    border: none;
    color: var(--danger);
    cursor: pointer;
    transition: background var(--transition-fast);
}

.range-remove-btn:hover {
    background: var(--danger-muted);
}

.range-remove-btn svg {
    width: 16px;
    height: 16px;
}

.range-download-btn svg {
    width: 14px;
    height: 14px;
}

/* ── Preview Section (main area) ── */
.preview-section {
    display: none;
    flex: 1;
    flex-direction: column;
    overflow: hidden;
    padding: var(--space-4);
    animation: fadeIn 0.5s ease;
}

.section-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--space-3);
    gap: var(--space-3);
}

.section-header h2 {
    font-size: var(--font-size-base);
    font-weight: 600;
    color: var(--text-primary);
}

.preview-container {
    flex: 1;
    overflow-x: auto;
    overflow-y: hidden;
    padding: var(--space-2);
    display: flex;
    gap: var(--space-4);
    align-items: flex-start;
    scrollbar-width: thin;
    scrollbar-color: var(--accent) transparent;
    -webkit-overflow-scrolling: touch;
}

.preview-container::-webkit-scrollbar {
    height: 6px;
}

.preview-container::-webkit-scrollbar-track {
    background: var(--bg-surface-hover);
    border-radius: 10px;
}

.preview-container::-webkit-scrollbar-thumb {
    background: var(--border-strong);
    border-radius: 10px;
}

.preview-container::-webkit-scrollbar-thumb:hover {
    background: var(--accent);
}

.page-card {
    flex: 0 0 auto;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-2);
    transition: transform 0.2s ease;
    background: none;
    border: none;
    padding: 0;
    margin: 0;
    color: inherit;
    cursor: pointer;
    -webkit-tap-highlight-color: transparent;
}

.page-card:hover {
    transform: translateY(-5px);
}

.page-card:active {
    transform: scale(0.98);
}

.page-thumbnail-wrapper {
    background: #fff;
    border-radius: var(--radius-sm);
    overflow: hidden;
    box-shadow: var(--shadow-md);
    border: 1px solid var(--border-default);
    height: 220px;
    aspect-ratio: 1 / 1.414;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: border-color var(--transition-fast);
}

.page-card:hover .page-thumbnail-wrapper {
    border-color: var(--accent);
}

.page-thumbnail-wrapper canvas {
    max-width: 100%;
    max-height: 100%;
    display: block;
}

.page-number-badge {
    background: var(--accent-muted);
    color: var(--accent);
    padding: 0.25rem 0.6rem;
    border-radius: var(--radius-sm);
    font-size: var(--font-size-xs);
    font-weight: 600;
    border: 1px solid var(--accent-muted);
}

.preview-loading {
    width: 100%;
    height: 200px;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: var(--space-3);
    color: var(--text-tertiary);
    background: var(--bg-surface);
    border-radius: var(--radius-md);
    border: 1px dashed var(--border-default);
}

.spinner {
    width: 30px;
    height: 30px;
    border: 3px solid var(--accent-muted);
    border-top-color: var(--accent);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    to { transform: rotate(360deg); }
}

/* ── Modal Overlay (large preview) ── */
.modal-overlay {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.85);
    z-index: 1000;
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    animation: fadeIn 0.3s ease;
    padding: var(--space-4);
    overflow-y: auto;
}

.modal-content {
    position: relative;
    width: 100%;
    max-width: 900px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: var(--space-4);
    animation: slideUp 0.3s ease-out;
    margin: auto;
}

@keyframes slideUp {
    from { opacity: 0; transform: translateY(20px); }
    to { opacity: 1; transform: translateY(0); }
}

.modal-close {
    position: absolute;
    top: var(--space-3);
    right: var(--space-3);
    z-index: 1100;
    background: var(--bg-surface-raised);
    border: 1px solid var(--border-default);
    color: var(--text-primary);
    width: 40px;
    height: 40px;
    border-radius: 50%;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-fast);
}

.modal-close:hover {
    background: var(--danger);
    border-color: var(--danger);
    color: #fff;
}

.modal-close svg {
    width: 18px;
    height: 18px;
}

#modal-canvas-container {
    background: #fff;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-xl);
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
}

#modal-canvas {
    display: block;
    width: 100%;
    height: auto;
    max-width: 100%;
}

.modal-page-info {
    background: var(--accent);
    color: #fff;
    padding: 0.5rem 1.25rem;
    border-radius: var(--radius-md);
    font-weight: 700;
    font-size: var(--font-size-sm);
}

/* ── Range hint inside sidebar ── */
.range-hint {
    padding: var(--space-2) var(--space-3);
    line-height: 1.5;
}

.range-hint b {
    color: var(--accent-text);
}

/* ── Responsive ── */
@media (max-width: 640px) {
    .range-item {
        grid-template-columns: 1fr auto;
    }

    .range-download-btn {
        grid-column: 1 / -1;
        justify-content: center;
    }

    .page-thumbnail-wrapper {
        height: 180px;
    }
}