.shell {
    display: grid;
    grid-template-columns: var(--left-width, 300px) 4px minmax(0, 1fr) auto auto;
    grid-template-rows: 35px minmax(0, 1fr) 24px;
    height: 100vh;
    overflow: hidden;
}

/* Custom Title Bar */

.titlebar {
    grid-row: 1;
    grid-column: 1 / -1;
    display: flex;
    align-items: center;
    position: relative;
    height: 35px;
    background: var(--ka-chrome-bg);
    border-bottom: 1px solid var(--ka-border);
    user-select: none;
    -webkit-app-region: drag;
    padding-left: 78px; /* Offset for macOS traffic light buttons */
    padding-right: 8px;
    z-index: 10;
}

/* Off macOS the native frame stays and carries the title; the bar keeps only its buttons. */
body:not(.is-mac) .titlebar {
    height: 30px;
    padding-left: 8px;
    -webkit-app-region: no-drag;
}

body:not(.is-mac) .titlebar-center {
    visibility: hidden;
}

body:not(.is-mac) .titlebar-drag-region {
    display: none;
}

.titlebar-drag-region {
    position: absolute;
    inset: 0;
    -webkit-app-region: drag;
    pointer-events: auto;
}

.titlebar-center {
    flex: 1;
    text-align: center;
    font-size: 12px;
    color: var(--ka-muted);
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    pointer-events: none;
}

.titlebar-actions {
    display: flex;
    align-items: center;
    gap: 4px;
    z-index: 2;
    -webkit-app-region: no-drag;
}

.slot-left {
    grid-row: 2;
    grid-column: 1;
    background: var(--ka-chrome-bg);
}

.slot-right {
    grid-row: 2;
    grid-column: 5;
    width: var(--right-width, 360px);
    background: var(--ka-chrome-bg);
}

.slot-left[hidden],
.slot-right[hidden],
.slot-bottom[hidden],
.splitter[hidden] {
    display: none;
}

.shell.is-left-hidden {
    grid-template-columns: 0px 0px minmax(0, 1fr) auto auto;
}

.splitter {
    grid-row: 2;
    cursor: col-resize;
    background: var(--ka-chrome-bg);
}

#splitter-left {
    grid-column: 2;
    border-right: 1px solid var(--ka-border);
}

#splitter-right {
    grid-column: 4;
    width: 4px;
    border-left: 1px solid var(--ka-border);
}

.splitter:hover,
.splitter.is-dragging {
    background: var(--ka-focus);
}

.main {
    grid-row: 2;
    grid-column: 3;
    display: flex;
    flex-direction: column;
    min-width: 0;
}

.slot {
    position: relative;
    min-height: 0;
}

.panel-frame {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    border: none;
    background: var(--ka-bg);
}

.panel-frame[hidden] {
    display: none;
}

/* While a splitter is dragged the frames would swallow the pointer. */
.shell.is-resizing .panel-frame {
    pointer-events: none;
}

/* Tabs Bar & Controls */

.tabs-bar {
    display: flex;
    align-items: center;
    height: 35px;
    background: var(--ka-tab-bg);
    border-bottom: 1px solid var(--ka-border);
    flex: none;
}

.layout-toggle {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 28px;
    height: 28px;
    border-radius: 4px;
    background: transparent;
    border: none;
    color: var(--ka-muted);
    cursor: pointer;
    flex: none;
    padding: 0;
    -webkit-app-region: no-drag;
}

.layout-toggle[hidden] {
    display: none;
}

.layout-toggle:hover {
    color: var(--ka-fg);
    background: var(--ka-hover);
}

.layout-toggle.is-active {
    color: var(--ka-accent);
}

/* Shown when a newer Kigumi release is out, like VS Code's update button. */
.update-button {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    height: 22px;
    margin-right: 4px;
    padding: 0 8px;
    border: none;
    border-radius: 11px;
    background: var(--ka-accent);
    color: var(--ka-accent-fg);
    font: inherit;
    font-size: 12px;
    cursor: pointer;
}

.update-button[hidden] {
    display: none;
}

.update-button:hover {
    filter: brightness(1.1);
}

.tabs {
    display: flex;
    flex: 1;
    height: 100%;
    overflow-x: auto;
    background: transparent;
    border-bottom: none;
    scrollbar-width: none;
}

.tab {
    display: flex;
    align-items: center;
    gap: 6px;
    flex: none;
    max-width: 260px;
    padding: 0 6px 0 12px;
    border: none;
    border-right: 1px solid var(--ka-border);
    background: transparent;
    color: var(--ka-muted);
    cursor: pointer;
    white-space: nowrap;
}

.tab.is-active {
    background: var(--ka-tab-active-bg);
    color: var(--ka-fg);
    box-shadow: inset 0 1px 0 var(--ka-accent);
}

.tab:focus-visible {
    outline: 1px solid var(--ka-focus);
    outline-offset: -1px;
}

.tab-title {
    overflow: hidden;
    text-overflow: ellipsis;
}

.tab-close {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 20px;
    height: 20px;
    border-radius: 4px;
    visibility: hidden;
}

.tab:hover .tab-close,
.tab.is-active .tab-close {
    visibility: visible;
}

.tab-close:hover {
    background: var(--ka-hover);
}

/* Content and welcome */

.slot-center {
    flex: 1;
}

.splitter-bottom {
    height: 4px;
    flex: none;
    cursor: row-resize;
    border-top: 1px solid var(--ka-border);
}

.slot-bottom {
    flex: none;
    height: var(--bottom-height, 240px);
    background: var(--ka-chrome-bg);
}

.welcome {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 12px;
    height: 100%;
    padding: 24px;
    text-align: center;
    color: var(--ka-muted);
}

.welcome[hidden] {
    display: none;
}

.welcome h1 {
    margin: 0;
    color: var(--ka-fg);
    font-size: 28px;
    font-weight: 300;
    letter-spacing: 0.02em;
}

.welcome-lead {
    margin: 0;
    max-width: 420px;
}

.welcome-actions {
    display: flex;
    gap: 8px;
}

.welcome-recent {
    min-width: 280px;
    max-width: 480px;
    text-align: left;
}

.welcome-recent[hidden] {
    display: none;
}

.welcome-recent h2 {
    margin: 0 0 4px;
    color: var(--ka-fg);
    font-size: 13px;
    font-weight: 600;
}

.welcome-recent ul {
    margin: 0;
    padding: 0;
    list-style: none;
}

.welcome-recent li {
    display: flex;
    gap: 8px;
    align-items: baseline;
    min-width: 0;
    padding: 2px 0;
}

.welcome-recent-folder {
    flex: none;
    padding: 0;
    border: none;
    background: none;
    color: var(--ka-accent);
    font: inherit;
    cursor: pointer;
}

.welcome-recent-folder:hover {
    text-decoration: underline;
}

.welcome-recent-folder:focus-visible {
    outline: 2px solid var(--ka-focus);
    outline-offset: 2px;
}

.welcome-recent-path {
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
    font-size: 12px;
}

.welcome-actions button {
    padding: 6px 14px;
    border: 1px solid transparent;
    border-radius: 4px;
    background: var(--ka-accent);
    color: var(--ka-accent-fg);
    cursor: pointer;
}

.welcome-actions button.secondary {
    background: transparent;
    border-color: var(--ka-border);
    color: var(--ka-fg);
}

.welcome-actions button:focus-visible {
    outline: 2px solid var(--ka-focus);
    outline-offset: 2px;
}

.welcome-keys {
    display: grid;
    grid-template-columns: auto auto;
    gap: 6px 12px;
    margin: 16px 0 0;
    font-size: 12px;
}

.welcome-keys dt {
    text-align: right;
}

.welcome-keys dd {
    margin: 0;
    text-align: left;
}

kbd {
    padding: 1px 5px;
    border: 1px solid var(--ka-border);
    border-radius: 3px;
    font-family: var(--ka-font);
    font-size: 11px;
}

/* Status bar */

.status {
    grid-row: 3;
    grid-column: 1 / -1;
    display: flex;
    align-items: center;
    gap: 2px;
    padding: 0 6px;
    background: var(--ka-status-bg);
    border-top: 1px solid var(--ka-border);
    font-size: 12px;
    white-space: nowrap;
    overflow: hidden;
}

.status-item {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    height: 22px;
    padding: 0 6px;
    border: none;
    border-radius: 3px;
    background: none;
    color: var(--ka-fg);
}

button.status-item {
    cursor: pointer;
}

button.status-item:hover {
    background: var(--ka-hover);
}

.status-item[hidden] {
    display: none;
}

.status-item .codicon {
    font-size: 14px;
}

.status-message {
    overflow: hidden;
    text-overflow: ellipsis;
    min-width: 0;
    flex-shrink: 1;
}

.status-message.is-error {
    color: var(--ka-error);
}

.status-message.is-warning {
    color: var(--ka-warning);
}

.status-spacer {
    flex: 1;
}

.status-version {
    color: var(--ka-muted);
}

.badge {
    width: 7px;
    height: 7px;
    border-radius: 50%;
    background: var(--ka-error);
}

.badge[hidden] {
    display: none;
}