/*
 * structure.css — Decision Tree Navigator
 *
 * Layout and behaviour only.
 * No colours, no fonts, no borders, no hover states.
 * This file is always loaded regardless of the design.css toggle.
 * If design.css is disabled, the tree is unstyled but fully functional.
 */

/* ── Box sizing ──────────────────────────────────────────────────────────── */
.dtnav-root,
.dtnav-root *,
.dtnav-root *::before,
.dtnav-root *::after {
    box-sizing: border-box;
}

:where(.dtnav-root) {
    --dtnav-gap-large:   40px;
    --dtnav-gap-medium:  20px;
    --dtnav-gap-small:   12px;
    --dtnav-gap-xsmall:  8px;
    --dtnav-gap-tiny:    4px;

    --dtnav-sticky-top:  20px;
}

/* ── Two-column layout ───────────────────────────────────────────────────── */
.dtnav-root .dtnav-layout {
    display: grid;
    grid-template-columns: 1fr minmax(160px, 220px);
    grid-template-areas: "main sidebar";
    gap: 0 var(--dtnav-gap-large);
    align-items: start;
}

.dtnav-root .dtnav-main {
    grid-area: main;
    min-width: 0;
}

.dtnav-root .dtnav-sidebar {
    grid-area: sidebar;
    position: sticky;
    top: var(--dtnav-sticky-top);
}

/* ── Sidebar nav link overflow protection ───────────────────────────────── */
.dtnav-root .dtnav-tree-nav a {
    display: block;
    overflow-wrap: break-word;
    word-break: break-word;
}

/* Full width layout when sidebar is disabled */
.dtnav-root--no-sidebar .dtnav-layout {
    grid-template-columns: 1fr;
    grid-template-areas: "main";
}

.dtnav-root--no-sidebar .dtnav-sidebar {
    display: none;
}

/* ── Breadcrumb ──────────────────────────────────────────────────────────── */
.dtnav-root .dtnav-breadcrumb {
    margin-bottom: var(--dtnav-gap-medium);
}

.dtnav-root--no-breadcrumb .dtnav-breadcrumb {
    display: none;
}

.dtnav-root .dtnav-breadcrumb__list {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: var(--dtnav-gap-tiny);
    list-style: none;
    margin: 0;
    padding: 0;
}

.dtnav-root .dtnav-breadcrumb__item {
    display: flex;
    align-items: center;
}

/* Separator between breadcrumb items via CSS, not DOM */
.dtnav-root .dtnav-breadcrumb__item + .dtnav-breadcrumb__item::before {
    padding: 0 4px;
    /* Pseudo-elements are naturally skipped by most screen readers. */
}

.dtnav-root .dtnav-breadcrumb__link {
    background: none;
    border: none;
    padding: 2px 8px;
    cursor: pointer;
    font-family: inherit;
    font-size: inherit;
}

.dtnav-root .dtnav-breadcrumb__current {
    padding: 2px 8px;
}

.dtnav-root .dtnav-breadcrumb__current {
    padding: 2px 8px;
}

/* ── Start screen ────────────────────────────────────────────────────────── */
.dtnav-root .dtnav-start__choices {
    list-style: none;
    margin: 0;
    padding: 0;
    display: flex;
    flex-direction: column;
}

.dtnav-root .dtnav-start__choice {
    display: flex;
    align-items: center;
    gap: var(--dtnav-gap-small);
    padding: var(--dtnav-gap-small) 14px;
    cursor: pointer;
    text-align: left;
    width: 100%;
    font-family: inherit;
    font-size: inherit;
    background: none;
    border: none;
}

.dtnav-root .dtnav-start__choice-body {
    flex: 1;
    min-width: 0;
    display: flex;
    flex-direction: column;
    gap: 2px;
}

.dtnav-root .dtnav-start__choice-arrow {
    flex-shrink: 0;
    display: inline-block;
    width: 18px;
    height: 18px;
}

/* ── Question screen ─────────────────────────────────────────────────────── */
.dtnav-root .dtnav-question__choices {
    list-style: none;
    margin: 0 0 var(--dtnav-gap-small);
    padding: 0;
    display: flex;
    flex-direction: column;
}

.dtnav-root .dtnav-question__choice {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 10px;
    padding: 10px var(--dtnav-gap-small);
    cursor: pointer;
    text-align: left;
    width: 100%;
    background: none;
    border: none;
    font-family: inherit;
    font-size: inherit;
}

.dtnav-root .dtnav-question__choice-text {
    flex: 1;
}

.dtnav-root .dtnav-question__choice-arrow {
    flex-shrink: 0;
    display: inline-block;
    width: 18px;
    height: 18px;
}

/* ── Result screen ───────────────────────────────────────────────────────── */
.dtnav-root .dtnav-result__resources {
    list-style: none;
    margin: 0 0 var(--dtnav-gap-small);
    padding: 0;
    display: flex;
    flex-direction: column;
}

.dtnav-root .dtnav-result__resource {
    padding: var(--dtnav-gap-small) 0;
}

.dtnav-root .dtnav-result__resource-name a,
.dtnav-root .dtnav-result__resource-detail a {
    text-decoration: underline;
}

.dtnav-root .dtnav-result__resource-phone a {
    display: inline-flex;
    align-items: center;
    gap: 5px;
    margin-top: 4px;
    text-decoration: none;
}

.dtnav-root .dtnav-result__resource-phone a:hover {
    text-decoration: underline;
}

/* ── Actions nav ─────────────────────────────────────────────────────────── */
.dtnav-root .dtnav-actions {
    display: flex;
    flex-wrap: wrap;
    gap: var(--dtnav-gap-xsmall);
    margin-top: var(--dtnav-gap-small);
}

.dtnav-root .dtnav-actions__back,
.dtnav-root .dtnav-actions__restart {
    display: inline-flex;
    align-items: center;
    gap: 5px;
    cursor: pointer;
    font-family: inherit;
    background: none;
    border: none;
    padding: 6px 14px;
}

.dtnav-root .dtnav-actions__back-arrow {
    display: inline-block;
    width: 18px;
    height: 18px;
}

/* ── "Also available" shelf ──────────────────────────────────────────────── */
.dtnav-root .dtnav-also {
    margin-top: var(--dtnav-gap-medium);
    padding-top: var(--dtnav-gap-small);
}

.dtnav-root .dtnav-also__list {
    list-style: none;
    margin: 8px 0 0;
    padding: 0;
}

/* Pills layout (under questions) */
.dtnav-root .dtnav-also__list--pills {
    display: flex;
    flex-wrap: wrap;
    gap: var(--dtnav-gap-xsmall);
}

.dtnav-root .dtnav-also__list--pills .dtnav-also__item {
    display: inline-flex;
    flex-direction: column;
    align-items: flex-start;
    cursor: pointer;
    text-align: left;
    font-family: inherit;
    background: none;
    border: none;
    padding: 6px 12px;
}

/* Rows layout (under results) */
.dtnav-root .dtnav-also__list--rows {
    display: flex;
    flex-direction: column;
}

.dtnav-root .dtnav-also__list--rows .dtnav-also__item {
    display: grid;
    grid-template-columns: minmax(120px, 220px) 1fr auto;
    align-items: center;
    gap: var(--dtnav-gap-small);
    padding: var(--dtnav-gap-xsmall) var(--dtnav-gap-small);
    cursor: pointer;
    text-align: left;
    width: 100%;
    background: none;
    border: none;
    font-family: inherit;
}

.dtnav-root .dtnav-also__item-label {
    display: block;
    font-weight: 600;
}

.dtnav-root .dtnav-also__item-desc {
    display: block;
    font-size: 0.85em;
}

.dtnav-root .dtnav-also__item-arrow {
    flex-shrink: 0;
    display: inline-block;
    width: 18px;
    height: 18px;
}

/* Animations moved to design.css */

/* ── Focus rings (always present, not visual design) ─────────────────────── */
.dtnav-root button:focus-visible,
.dtnav-root a:focus-visible,
.dtnav-root [tabindex]:focus-visible {
    outline: 3px solid;
    outline-offset: 2px;
}

/* ── Responsive ──────────────────────────────────────────────────────────── */
@media (max-width: 720px) {
    .dtnav-root .dtnav-layout {
        grid-template-columns: 1fr;
        grid-template-areas:
            "main"
            "sidebar";
        gap: 32px 0;
    }

    .dtnav-root .dtnav-sidebar {
        position: static;
    }

    .dtnav-root .dtnav-tree-nav ul {
        max-height: 200px;
        overflow-y: auto;
    }
}

@media (max-width: 600px) {
    .dtnav-root .dtnav-start__choice,
    .dtnav-root .dtnav-also__list--rows .dtnav-also__item {
        grid-template-columns: 1fr auto;
        gap: 4px 12px;
    }
    
    .dtnav-root .dtnav-start__choice-label,
    .dtnav-root .dtnav-also__item-label {
        grid-column: 1 / 2;
    }
    
    .dtnav-root .dtnav-start__choice-desc,
    .dtnav-root .dtnav-also__item-desc {
        grid-column: 1 / 2;
        font-size: 11px;
    }
    
    .dtnav-root .dtnav-start__choice-arrow,
    .dtnav-root .dtnav-also__item-arrow {
        grid-column: 2 / 3;
        grid-row: 1 / 3;
    }
}

@media (max-width: 480px) {
    .dtnav-root .dtnav-start__choice {
        padding: 10px;
    }

    .dtnav-root .dtnav-question__choice {
        padding: 9px 10px;
    }
}