feat(frontend): add complete CSS design system and HTML shell
Create the Nexus Terminal design system with dark charcoal palette, teal accent, and premium desktop application styling: - tokens.css: Design tokens (colours, spacing, typography, layout) - base.css: Modern reset, scrollbar, focus, and utility styles - components.css: Buttons, forms, badges, dropdowns, notifications, disclosure, search, empty state, tooltip, spinner - layout.css: App grid shell (sidebar, tab bar, workspace, status bar) - sidebar.css: Connection manager with sections, profile items, search - tabs.css: Compact session tabs with status dots, protocol badges - terminal.css: xterm.js container, RAW mode views, send bar, search - forms.css: Profile editor sections, tag input, jump hosts, validation - modals.css: Modal, drawer, confirmation, host key, settings dialogs - index.html: Complete HTML shell with sidebar, tabs, workspace, status
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/* ==========================================================================
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Nexus Terminal — Tab Bar & Tabs
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Compact session tabs with status indicators, protocol badges, and
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close / pin controls.
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========================================================================== */
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/* -----------------------------------------------------------------------
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Individual tab
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----------------------------------------------------------------------- */
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.tab {
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display: inline-flex;
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align-items: center;
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gap: var(--space-2);
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height: var(--tab-bar-height);
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padding: 0 var(--space-3);
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font-size: var(--text-sm);
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color: var(--text-secondary);
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cursor: pointer;
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white-space: nowrap;
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position: relative;
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flex-shrink: 0;
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border-right: 1px solid var(--border-subtle);
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transition:
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background var(--transition-fast),
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color var(--transition-fast);
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user-select: none;
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max-width: 200px;
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}
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.tab:hover {
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background: var(--bg-hover);
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color: var(--text-primary);
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}
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/* Active tab */
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.tab.active {
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background: var(--bg-base);
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color: var(--text-primary);
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}
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/* Active indicator — accent bar at the bottom */
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.tab.active::after {
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content: '';
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position: absolute;
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bottom: 0;
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left: 0;
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right: 0;
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height: 2px;
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background: var(--accent);
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border-radius: var(--radius-full) var(--radius-full) 0 0;
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}
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/* -----------------------------------------------------------------------
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Tab icon (small terminal/protocol icon)
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----------------------------------------------------------------------- */
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.tab-icon {
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width: 14px;
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height: 14px;
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flex-shrink: 0;
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display: flex;
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align-items: center;
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justify-content: center;
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font-size: 12px;
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color: var(--text-tertiary);
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}
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.tab.active .tab-icon {
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color: var(--text-secondary);
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}
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/* -----------------------------------------------------------------------
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Tab label
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----------------------------------------------------------------------- */
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.tab-label {
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overflow: hidden;
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text-overflow: ellipsis;
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white-space: nowrap;
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min-width: 0;
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}
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/* -----------------------------------------------------------------------
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Protocol mini-badge inside tab
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----------------------------------------------------------------------- */
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.tab-badge {
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display: inline-flex;
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align-items: center;
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height: 14px;
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padding: 0 3px;
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font-size: 9px;
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font-weight: var(--weight-semibold);
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text-transform: uppercase;
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letter-spacing: 0.04em;
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border-radius: 2px;
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flex-shrink: 0;
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line-height: 1;
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}
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.tab-badge.badge-ssh {
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background: rgba(78, 205, 196, 0.15);
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color: var(--protocol-ssh);
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}
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.tab-badge.badge-telnet {
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background: rgba(255, 167, 38, 0.15);
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color: var(--protocol-telnet);
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}
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.tab-badge.badge-raw {
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background: rgba(171, 71, 188, 0.15);
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color: var(--protocol-raw);
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}
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/* -----------------------------------------------------------------------
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Status dot (connection state)
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----------------------------------------------------------------------- */
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.tab-status {
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width: 6px;
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height: 6px;
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border-radius: 50%;
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flex-shrink: 0;
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background: var(--text-tertiary);
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}
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.tab-status.is-connected { background: var(--success); }
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.tab-status.is-connecting { background: var(--warning); animation: pulse-dot 1.2s ease infinite; }
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.tab-status.is-error { background: var(--error); }
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.tab-status.is-disconnected { background: var(--text-tertiary); }
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/* -----------------------------------------------------------------------
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Close button — revealed on hover
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----------------------------------------------------------------------- */
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.tab-close {
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width: 16px;
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height: 16px;
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display: flex;
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align-items: center;
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justify-content: center;
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border-radius: var(--radius-sm);
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font-size: 11px;
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color: var(--text-tertiary);
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flex-shrink: 0;
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opacity: 0;
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transition:
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opacity var(--transition-fast),
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background var(--transition-fast),
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color var(--transition-fast);
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cursor: pointer;
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margin-left: auto;
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}
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.tab:hover .tab-close,
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.tab.active .tab-close {
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opacity: 1;
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}
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.tab-close:hover {
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background: var(--bg-active);
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color: var(--text-primary);
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}
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/* -----------------------------------------------------------------------
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Pin indicator
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----------------------------------------------------------------------- */
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.tab-pin {
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width: 12px;
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height: 12px;
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display: flex;
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align-items: center;
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justify-content: center;
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font-size: 9px;
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color: var(--text-disabled);
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flex-shrink: 0;
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}
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.tab.is-pinned .tab-pin {
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color: var(--accent);
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}
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/* Pinned tabs are always narrow */
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.tab.is-pinned {
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max-width: 100px;
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padding: 0 var(--space-2);
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}
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.tab.is-pinned .tab-label {
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/* Hide label on pinned tabs to save space */
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display: none;
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}
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.tab.is-pinned .tab-close {
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/* Pinned tabs don't show close by default */
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display: none;
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}
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/* -----------------------------------------------------------------------
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Drag handle area (for tab reordering)
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----------------------------------------------------------------------- */
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.tab-drag-handle {
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cursor: grab;
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flex: 1;
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display: flex;
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align-items: center;
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gap: var(--space-2);
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min-width: 0;
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height: 100%;
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}
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.tab-drag-handle:active {
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cursor: grabbing;
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}
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/* Drag ghost styling */
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.tab.is-dragging {
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opacity: 0.5;
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}
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.tab.is-drag-over-left::before {
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content: '';
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position: absolute;
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left: -1px;
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top: 4px;
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bottom: 4px;
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width: 2px;
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background: var(--accent);
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border-radius: var(--radius-full);
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}
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.tab.is-drag-over-right::after {
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content: '';
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position: absolute;
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right: -1px;
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top: 4px;
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bottom: 4px;
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width: 2px;
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background: var(--accent);
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border-radius: var(--radius-full);
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/* Note: this re-uses ::after — active tab indicator is overridden while dragging */
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}
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/* -----------------------------------------------------------------------
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New-tab button (+)
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----------------------------------------------------------------------- */
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.tab-new {
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display: flex;
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align-items: center;
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justify-content: center;
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width: var(--tab-bar-height);
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height: var(--tab-bar-height);
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font-size: var(--text-lg);
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color: var(--text-tertiary);
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cursor: pointer;
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flex-shrink: 0;
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transition: background var(--transition-fast), color var(--transition-fast);
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border: none;
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background: none;
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}
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.tab-new:hover {
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background: var(--bg-hover);
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color: var(--text-primary);
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}
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.tab-new:active {
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background: var(--bg-active);
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}
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/* -----------------------------------------------------------------------
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Tab overflow indicators (chevrons at edges)
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----------------------------------------------------------------------- */
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.tab-bar-overflow-left,
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.tab-bar-overflow-right {
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display: none;
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align-items: center;
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justify-content: center;
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width: 20px;
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flex-shrink: 0;
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font-size: var(--text-sm);
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color: var(--text-tertiary);
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cursor: pointer;
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background: linear-gradient(90deg, var(--bg-surface), transparent);
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}
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.tab-bar-overflow-right {
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background: linear-gradient(-90deg, var(--bg-surface), transparent);
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}
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.tab-bar.has-overflow-left .tab-bar-overflow-left,
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.tab-bar.has-overflow-right .tab-bar-overflow-right {
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display: flex;
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}
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/* -----------------------------------------------------------------------
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Tab context menu trigger (on right-click)
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----------------------------------------------------------------------- */
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.tab-context-area {
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position: absolute;
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inset: 0;
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z-index: 1;
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/* Transparent hit area for right-click context menu */
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}
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/* -----------------------------------------------------------------------
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Modified indicator (unsaved changes)
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----------------------------------------------------------------------- */
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.tab.is-modified .tab-close::before {
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content: '●';
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font-size: 8px;
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color: var(--accent);
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}
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