/* layout.css — Single-page sidebar + main content area */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

:root {
    --sidebar-width: 280px;
    --toolbar-height: 42px;
    --color-bg: #1e1e2e;
    --color-surface: #2a2a3c;
    --color-sidebar: #232334;
    --color-border: #3a3a4c;
    --color-text: #e0e0e0;
    --color-text-muted: #888;
    --color-primary: #6c9fff;
    --color-primary-hover: #5a8ae8;
    --color-danger: #e55;
    --color-success: #4caf50;
    --color-warning: #ffa726;
    --radius: 6px;
    --transition: 0.15s ease;
}

html, body {
    height: 100%;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    font-size: 14px;
    color: var(--color-text);
    background: var(--color-bg);
}

.app-layout {
    display: grid;
    grid-template-columns: var(--sidebar-width) 1fr;
    height: 100vh;
    overflow: hidden;
}

/* Sidebar */
.sidebar {
    background: var(--color-sidebar);
    border-right: 1px solid var(--color-border);
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.sidebar-header {
    padding: 16px;
    border-bottom: 1px solid var(--color-border);
}

.sidebar-header h1 {
    font-size: 16px;
    font-weight: 600;
}

.sidebar-section {
    flex: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    border-bottom: 1px solid var(--color-border);
}

.section-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 10px 16px;
}

.section-header h2 {
    font-size: 12px;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--color-text-muted);
}

.item-list {
    flex: 1;
    overflow-y: auto;
    padding: 4px 8px;
}

/* Main content */
.main-content {
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.toolbar {
    height: var(--toolbar-height);
    padding: 0 16px;
    display: flex;
    align-items: center;
    gap: 16px;
    border-bottom: 1px solid var(--color-border);
    background: var(--color-surface);
}

.size-metric-toggle {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 13px;
}

.size-metric-toggle select {
    background: var(--color-bg);
    color: var(--color-text);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 4px 8px;
    font-size: 13px;
}

.content-area {
    flex: 1;
    overflow: hidden;
    position: relative;
    display: flex;
    flex-direction: column;
}

.empty-state {
    display: flex;
    align-items: center;
    justify-content: center;
    height: 100%;
    color: var(--color-text-muted);
    font-size: 15px;
}

/* Side-by-side layout */
.split-view {
    display: grid;
    grid-template-columns: 1fr 1fr;
    height: 100%;
    gap: 1px;
    background: var(--color-border);
}

.split-panel {
    background: var(--color-bg);
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

.panel-header {
    padding: 10px 16px;
    border-bottom: 1px solid var(--color-border);
    background: var(--color-surface);
    font-weight: 500;
    font-size: 13px;
}

/* Buttons */
.btn {
    background: var(--color-surface);
    color: var(--color-text);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    padding: 6px 12px;
    font-size: 12px;
    cursor: pointer;
    transition: background var(--transition);
}

.btn:hover {
    background: var(--color-border);
}

.btn-small {
    padding: 4px 8px;
    font-size: 11px;
}

.btn-primary {
    background: var(--color-primary);
    border-color: var(--color-primary);
    color: #fff;
}

.btn-primary:hover {
    background: var(--color-primary-hover);
}

.btn-danger {
    color: var(--color-danger);
    border-color: var(--color-danger);
}

.btn-danger:hover {
    background: var(--color-danger);
    color: #fff;
}

/* Dialogs */
dialog {
    background: var(--color-surface);
    color: var(--color-text);
    border: 1px solid var(--color-border);
    border-radius: 12px;
    padding: 24px;
    min-width: 360px;
    max-width: 480px;
}

dialog::backdrop {
    background: rgba(0, 0, 0, 0.6);
}

.form-group {
    margin-bottom: 16px;
}

.form-group label {
    display: block;
    margin-bottom: 6px;
    font-size: 13px;
    color: var(--color-text-muted);
}

.form-group input[type="text"],
.form-group input[type="number"],
.form-group input[type="file"] {
    width: 100%;
    padding: 8px 12px;
    background: var(--color-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius);
    color: var(--color-text);
    font-size: 14px;
}

.bd-size-options {
    display: flex;
    flex-direction: column;
    gap: 6px;
    margin-top: 4px;
}

.bd-size-options label {
    font-size: 13px;
    color: var(--color-text);
    cursor: pointer;
}

.dialog-actions {
    display: flex;
    justify-content: flex-end;
    gap: 8px;
    margin-top: 20px;
}

/* Progress */
.progress-area {
    margin: 12px 0;
}

.progress-bar {
    height: 6px;
    background: var(--color-bg);
    border-radius: 3px;
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    background: var(--color-primary);
    width: 0%;
    transition: width 0.3s ease;
}

.progress-text {
    font-size: 12px;
    color: var(--color-text-muted);
    margin-top: 4px;
    display: block;
}

.import-inline-progress {
    padding: 8px 12px;
}

.import-inline-progress .progress-bar {
    height: 4px;
    background: var(--color-bg);
    border-radius: 2px;
    overflow: hidden;
}

.import-inline-progress .progress-fill {
    height: 100%;
    background: var(--color-primary);
    width: 0%;
    transition: width 0.3s ease;
}

.import-inline-progress .progress-text {
    font-size: 11px;
    color: var(--color-text-muted);
    margin-top: 4px;
    display: block;
}

/* Sidebar items */
.sidebar-item {
    padding: 8px 12px;
    border-radius: var(--radius);
    cursor: pointer;
    transition: background var(--transition);
    margin-bottom: 2px;
}

.sidebar-item:hover {
    background: var(--color-surface);
}

.sidebar-item.active {
    background: var(--color-primary);
    color: #fff;
}

.sidebar-item .item-name {
    font-size: 13px;
    font-weight: 500;
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
}

.sidebar-item .item-meta {
    font-size: 11px;
    color: var(--color-text-muted);
    margin-top: 2px;
}

.sidebar-item.active .item-meta {
    color: rgba(255,255,255,0.7);
}

/* Scrollbar */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: transparent;
}

::-webkit-scrollbar-thumb {
    background: var(--color-border);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--color-text-muted);
}