/**
 * Settings sidebar — 1.3.7 Touch 2 Restructure
 *
 * Replaces the 11+ tab horizontal strip with a vertical sidebar
 * grouped Workspace / AI / App. Both shipped themes (Refined IDE,
 * Editorial Calm) render the same component via the frozen `--tk-*`
 * contract — no per-theme variants, no hex literals.
 *
 * The sidebar items keep `.settings-tab` so the existing tab-switching
 * loop in `js/settings-manager.js` matches them by selector. The
 * sidebar-specific overrides below win because this file loads after
 * `css/modals.css` (source order at equal specificity).
 *
 * Help modal still uses the legacy `.settings-tabs-nav` strip; those
 * rules remain in `css/modals.css` and are untouched. 1.3.10 retires
 * Help's strip when the slide-out lands.
 */

/* ----- Modal sizing ----- */

.settings-modal {
    width: min(1100px, 92vw);
    max-width: min(1100px, 92vw);
}

.settings-modal__header {
    display: grid;
    grid-template-columns: auto 1fr auto;
    align-items: center;
    column-gap: var(--tk-space-3);
}

/* ----- Search input ----- */

.settings-modal__search {
    display: flex;
    align-items: center;
    gap: var(--tk-space-2);
    height: 28px;
    padding: 0 var(--tk-space-2);
    background: var(--tk-bg-app);
    border: 1px solid var(--tk-border);
    border-radius: var(--tk-radius-md);
    transition: border-color 0.12s;
}

.settings-modal__search:focus-within {
    border-color: var(--tk-color-accent);
}

.settings-modal__search-icon {
    color: var(--tk-text-muted);
    font-size: var(--font-sm);
}

.settings-modal__search-input {
    flex: 1;
    min-width: 0;
    background: transparent;
    border: none;
    outline: none;
    color: var(--tk-text-primary);
    font: inherit;
    font-size: var(--font-sm);
}

.settings-modal__search-input::placeholder {
    color: var(--tk-cmd-placeholder);
}

.settings-modal__search-input::-webkit-search-cancel-button {
    -webkit-appearance: none;
    appearance: none;
}

.settings-modal__search-kbd {
    padding: 1px 6px;
    background: var(--tk-bg-raised);
    border: 1px solid var(--tk-border);
    border-radius: var(--tk-radius-sm);
    color: var(--tk-text-secondary);
    font-family: var(--tk-font-mono);
    font-size: var(--font-xs);
    line-height: 1.4;
}

/* ----- Two-column shell (sidebar | content) ----- */

.settings-shell {
    display: grid;
    grid-template-columns: 196px minmax(0, 1fr);
    flex: 1;
    min-height: 0;
    overflow: hidden;
}

/* ----- Sidebar ----- */

.settings-sidebar {
    overflow-y: auto;
    padding: var(--tk-space-2) var(--tk-space-2) var(--tk-space-3);
    background: var(--tk-bg-surface);
    border-right: 1px solid var(--tk-border);
}

.settings-sidebar__group + .settings-sidebar__group {
    margin-top: var(--tk-space-3);
}

.settings-sidebar__group--empty {
    display: none;
}

.settings-sidebar__group-label {
    margin: 0;
    padding: var(--tk-space-2) var(--tk-space-2) var(--tk-space-1);
    color: var(--tk-text-muted);
    font-size: var(--font-xs);
    font-weight: 600;
    letter-spacing: 0.06em;
    text-transform: uppercase;
}

/* Sidebar items override the horizontal-strip `.settings-tab` rules
   (border-bottom, white-space, etc.) for the vertical context. */
.settings-sidebar__item {
    display: flex;
    align-items: center;
    gap: var(--tk-space-2);
    width: 100%;
    padding: var(--tk-space-1) var(--tk-space-2);
    background: transparent;
    border: none;
    border-radius: var(--tk-radius-sm);
    color: var(--tk-text-secondary);
    font-size: var(--font-md);
    font-weight: 500;
    text-align: left;
    cursor: pointer;
    /* Transition only `background`. Transitioning `color` here latched the
       active item to the pre-theme-swap accent: a CSS-variable change on
       `:root` doesn't reliably retrigger a `color` transition driven by
       `var(--tk-color-accent)`, so the property gets stuck on the start
       value until the element is reflowed by another state change. */
    transition: background 0.12s;
    white-space: normal;
}

.settings-sidebar__item:hover {
    background: var(--tk-bg-hover);
    color: var(--tk-text-primary);
}

.settings-sidebar__item:focus-visible {
    outline: 2px solid var(--tk-color-accent);
    outline-offset: -2px;
}

.settings-sidebar__item.active {
    /* Translucent accent fill — theme-neutral overlay technique used
       elsewhere in modals.css; survives a missing theme link. */
    background: color-mix(in srgb, var(--tk-color-accent) 20%, transparent);
    color: var(--tk-color-accent);
}

.settings-sidebar__item[hidden] {
    display: none;
}

.settings-sidebar__empty {
    margin: var(--tk-space-3) var(--tk-space-2) 0;
    color: var(--tk-text-muted);
    font-size: var(--font-sm);
    font-style: italic;
}

/* ----- Content pane ----- */

.settings-content {
    overflow-y: auto;
    padding: var(--tk-space-4);
}

/* ----- Mobile collapse — sidebar stacks above content ----- */
@media (max-width: 768px) {
    .settings-modal {
        width: 100vw;
        max-width: 100vw;
        max-height: 100vh;
        border-radius: 0;
    }

    .settings-modal__header {
        grid-template-columns: 1fr auto;
        row-gap: var(--tk-space-2);
    }

    .settings-modal__search {
        grid-column: 1 / -1;
        order: 3;
    }

    .settings-shell {
        grid-template-columns: 1fr;
        grid-template-rows: auto minmax(0, 1fr);
    }

    .settings-sidebar {
        max-height: 30vh;
        border-right: none;
        border-bottom: 1px solid var(--tk-border);
    }
}