/* ===== Notebook Selector — Dropdown (mobile default) ===== */

.notebook-selector-container {
    display: flex;
    align-items: center;
    gap: 6px;
    flex: 1;
    min-width: 0;
    margin: 0 12px;
}

.notebook-dropdown {
    flex: 1;
    min-width: 0;
    padding: 4px 8px;
    background: var(--bg-card);
    color: var(--text-primary);
    border: 1px solid var(--border);
    border-radius: 6px;
    font-size: 13px;
    font-family: var(--font-sans);
    cursor: pointer;
    max-width: 200px;
}

.notebook-dropdown:focus {
    outline: none;
    border-color: var(--accent);
}

.notebook-add-btn {
    width: 28px;
    height: 28px;
    background: var(--bg-card);
    color: var(--accent);
    border: 1px solid var(--border);
    border-radius: 6px;
    font-size: 16px;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    flex-shrink: 0;
    transition: all 0.2s ease;
}

.notebook-add-btn:hover {
    background: var(--accent-glow);
    border-color: var(--accent);
}

/* ===== Notebook Sidebar (desktop default) ===== */

.notebook-sidebar {
    width: 200px;
    flex-shrink: 0;
    background: var(--bg-secondary);
    border-right: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.notebook-sidebar.hidden {
    display: none;
}

.sidebar-header {
    padding: 10px 12px;
    font-size: 12px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    color: var(--text-muted);
    border-bottom: 1px solid var(--border);
}

.sidebar-notebook-list {
    flex: 1;
    overflow-y: auto;
    padding: 6px 0;
}

.sidebar-notebook-item {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 8px 12px;
    cursor: pointer;
    font-size: 13px;
    color: var(--text-secondary);
    transition: all 0.15s ease;
    border-left: 3px solid transparent;
}

.sidebar-notebook-item:hover {
    background: var(--accent-glow);
    color: var(--text-primary);
}

.sidebar-notebook-item.active {
    background: rgba(88, 166, 255, 0.08);
    color: var(--text-primary);
    border-left-color: var(--accent);
}

.sidebar-nb-name {
    flex: 1;
    min-width: 0;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.sidebar-nb-close {
    width: 20px;
    height: 20px;
    background: none;
    border: none;
    color: var(--text-muted);
    font-size: 14px;
    cursor: pointer;
    border-radius: 4px;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: opacity 0.15s ease;
    flex-shrink: 0;
}

.sidebar-notebook-item:hover .sidebar-nb-close {
    opacity: 1;
}

.sidebar-nb-close:hover {
    background: rgba(248, 81, 73, 0.15);
    color: var(--red);
}

.sidebar-add-btn {
    display: block;
    width: calc(100% - 16px);
    margin: 4px 8px;
    padding: 6px 12px;
    background: none;
    border: 1px dashed var(--border);
    border-radius: 6px;
    color: var(--text-muted);
    font-size: 12px;
    cursor: pointer;
    text-align: center;
    transition: all 0.2s ease;
}

.sidebar-add-btn:hover {
    border-color: var(--accent);
    color: var(--accent);
    background: var(--accent-glow);
}

/* ===== Notebook Tab Bar ===== */

.notebook-tab-bar {
    display: flex;
    align-items: stretch;
    gap: 0;
    overflow-x: auto;
    flex: 1;
    min-width: 0;
}

.notebook-tab {
    display: flex;
    align-items: center;
    gap: 6px;
    padding: 4px 12px;
    font-size: 12px;
    color: var(--text-secondary);
    cursor: pointer;
    border-bottom: 2px solid transparent;
    white-space: nowrap;
    transition: all 0.15s ease;
}

.notebook-tab:hover {
    color: var(--text-primary);
    background: var(--accent-glow);
}

.notebook-tab.active {
    color: var(--accent);
    border-bottom-color: var(--accent);
}

.tab-close {
    width: 16px;
    height: 16px;
    background: none;
    border: none;
    color: var(--text-muted);
    font-size: 12px;
    cursor: pointer;
    border-radius: 3px;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    transition: opacity 0.15s ease;
}

.notebook-tab:hover .tab-close {
    opacity: 1;
}

.tab-close:hover {
    background: rgba(248, 81, 73, 0.15);
    color: var(--red);
}

.notebook-tab-add {
    color: var(--text-muted);
    font-size: 16px;
    padding: 4px 10px;
}

.notebook-tab-add:hover {
    color: var(--accent);
}

/* ===== Inline rename input ===== */

.nb-rename-input {
    flex: 1;
    min-width: 0;
    padding: 2px 6px;
    background: var(--bg-card);
    color: var(--text-primary);
    border: 1px solid var(--accent);
    border-radius: 4px;
    font-size: inherit;
    font-family: var(--font-sans);
    outline: none;
}

/* ===== Language badge in notebook selectors ===== */

.sidebar-notebook-item .lang-badge,
.notebook-tab .lang-badge {
    font-size: 10px;
    padding: 1px 5px;
    border-radius: 3px;
    background: var(--bg-card);
    border: 1px solid var(--border);
    flex-shrink: 0;
}