/* App shell and navigation (Navigation v2, owner-approved 2026-10-17).
   Structure is unchanged: sidebar + top bar + content. Desktop sidebar collapses to an icon
   rail; at 860px and below it becomes a slide-out drawer. */
:root {
    /* YELOW tokens (yelow.css) */
    --vp-ink: var(--ink, #172c38);
    --vp-green: var(--primary, #025894);
    --vp-green-dark: var(--primary-hover, #014678);
    --vp-paper: var(--paper, #f7fafb);
    --vp-line: var(--line, #dde6ea);
    --vp-tint: var(--tint, #e3eef3);
    --vp-muted: var(--muted, #4f6370);
    --vp-sidebar-width: 260px;
    --vp-rail-width: 76px;
}

body { margin: 0; background: var(--vp-paper); color: var(--vp-ink); }

.vp-skip-link {
    position: absolute; left: 12px; top: -48px; z-index: 2000;
    background: var(--vp-ink); color: #fff; padding: 8px 14px; border-radius: 6px; text-decoration: none;
}
.vp-skip-link:focus { top: 12px; color: #fff; }

.vp-shell { min-height: 100vh; display: grid; grid-template-columns: var(--vp-sidebar-width) minmax(0, 1fr); }

/* Sidebar scrolls independently of the page. */
.vp-sidebar {
    position: sticky; top: 0; height: 100vh; overflow-y: auto; overscroll-behavior: contain;
    background: #fff; border-right: 1px solid var(--vp-line); padding: 18px 12px 24px;
    display: flex; flex-direction: column; gap: 16px;
}
.vp-sidebar-header { display: flex; align-items: center; justify-content: space-between; gap: 8px; min-height: 40px; }
/* Approved YELOW wordmark (wwwroot/img/yelow-wordmark.png, black on transparent, 438x136). */
.vp-brand { display: flex; align-items: center; gap: 10px; min-width: 0; padding: 0 6px; white-space: nowrap; overflow: hidden; color: var(--vp-ink); }
.vp-brand-logo { display: block; flex: none; width: auto; height: 26px; }
.vp-wordmark-sub { font-size: 12px; font-weight: 600; letter-spacing: .06em; text-transform: uppercase; color: var(--vp-muted); border-left: 1px solid var(--vp-line); padding-left: 8px; margin-left: 2px; }

.vp-icon { width: 20px; height: 20px; flex: none; fill: none; stroke: currentColor; stroke-width: 1.8; stroke-linecap: round; stroke-linejoin: round; }

.vp-nav-list, .vp-group-list { list-style: none; margin: 0; padding: 0; display: grid; grid-template-columns: minmax(0, 1fr); gap: 2px; }
.vp-group-list { padding: 2px 0 6px 30px; }

.vp-sidebar .vp-nav-link, .vp-sidebar .vp-group-toggle {
    display: flex; align-items: center; gap: 12px; width: 100%; min-height: 40px;
    border: 0; border-radius: 999px; padding: 8px 12px; background: transparent;
    color: var(--vp-ink); text-decoration: none; font: inherit; font-weight: 500; text-align: left; cursor: pointer;
}
.vp-sidebar .vp-nav-child { min-height: 36px; padding: 6px 12px; }
.vp-sidebar .vp-nav-link:hover, .vp-sidebar .vp-group-toggle:hover { background: var(--soft, #eef4f6); color: var(--vp-green); }
.vp-sidebar .vp-nav-link.active { background: var(--vp-tint); color: var(--vp-green); font-weight: 650; }
.vp-sidebar .vp-group-toggle.active { color: var(--vp-green); font-weight: 650; }
.vp-nav-link:focus-visible, .vp-group-toggle:focus-visible, .vp-collapse-toggle:focus-visible,
.vp-menu-button:focus-visible, .vp-drawer-close:focus-visible, .vp-signout:focus-visible {
    outline: 3px solid var(--vp-green); outline-offset: 2px;
}
.vp-label { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.vp-group-toggle .vp-label { flex: 1; }
/* Long child labels wrap rather than widening the menu. */
.vp-sidebar .vp-nav-child .vp-label { white-space: normal; line-height: 1.3; }
.vp-chevron { width: 16px; height: 16px; transition: transform .15s ease; }
.vp-group-toggle[aria-expanded="true"] .vp-chevron { transform: rotate(90deg); }

.vp-collapse-toggle, .vp-drawer-close, .vp-menu-button {
    display: inline-grid; place-items: center; width: 38px; height: 38px; flex: none;
    border: 1px solid var(--vp-line); border-radius: 8px; background: #fff; color: var(--vp-ink); cursor: pointer;
}
.vp-collapse-toggle:hover, .vp-drawer-close:hover, .vp-menu-button:hover { background: var(--soft, #eef4f6); color: var(--vp-green); }
.vp-drawer-close, .vp-menu-button { display: none; }

.vp-main { min-width: 0; }
.vp-topbar {
    position: sticky; top: 0; z-index: 900; min-height: 66px; background: #fff; border-bottom: 1px solid var(--vp-line);
    padding: 12px 28px; display: flex; align-items: center; gap: 12px;
}
.vp-topbar-actions { margin-left: auto; display: flex; align-items: center; gap: 12px; }
.vp-user { display: flex; flex-direction: column; align-items: flex-end; line-height: 1.2; }
.vp-user-name { font-size: 14px; }
.vp-user-role { font-size: 12px; color: var(--vp-muted); }
.vp-topbar-link {
    display: inline-flex; align-items: center; justify-content: center; min-height: 40px; padding: 8px 15px;
    border: 1px solid var(--vp-line); border-radius: 8px; color: var(--vp-ink); text-decoration: none; font-weight: 650;
}
.vp-topbar-link:hover { background: var(--soft, #eef4f6); color: var(--vp-green); }
.vp-topbar-primary { background: var(--vp-green); border-color: var(--vp-green); color: #fff; }
.vp-topbar-primary:hover { background: var(--vp-green-dark); border-color: var(--vp-green-dark); color: #fff; }
.vp-content { max-width: 1400px; margin: 0 auto; padding: 34px 30px 52px; }
.vp-content:focus { outline: none; }
.vp-footer { border-top: 1px solid var(--vp-line); padding: 18px 30px; color: #71807a; font-size: 13px; }
.vp-signout { border: 0; background: transparent; color: var(--vp-ink); padding: 8px 12px; }

/* Desktop: collapsed icon rail. Labels stay in the accessibility tree (visually hidden). */
@media (min-width: 861px) {
    html[data-sidebar="collapsed"] .vp-shell { grid-template-columns: var(--vp-rail-width) minmax(0, 1fr); }
    html[data-sidebar="collapsed"] .vp-sidebar { padding-left: 10px; padding-right: 10px; }
    html[data-sidebar="collapsed"] .vp-sidebar-header { flex-direction: column; }
    /* Rail: the wordmark cropped to its stylised Y (the Y ends at 64% of the logo's height). */
    html[data-sidebar="collapsed"] .vp-brand { padding: 0; }
    html[data-sidebar="collapsed"] .vp-brand-logo { width: 18px; object-fit: cover; object-position: left center; }
    html[data-sidebar="collapsed"] .vp-label,
    html[data-sidebar="collapsed"] .vp-chevron {
        position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0, 0, 0, 0); white-space: nowrap; border: 0;
    }
    html[data-sidebar="collapsed"] .vp-sidebar .vp-nav-link, html[data-sidebar="collapsed"] .vp-sidebar .vp-group-toggle { justify-content: center; padding: 10px; }
    html[data-sidebar="collapsed"] .vp-group-list { display: none; }
    html[data-sidebar="collapsed"] .vp-collapse-toggle .vp-icon { transform: scaleX(-1); }
}

/* Tablet and phone: slide-out drawer over a scrim. */
@media (max-width: 860px) {
    .vp-shell { grid-template-columns: 1fr; }
    .vp-sidebar {
        position: fixed; inset: 0 auto 0 0; z-index: 1050; width: min(300px, 86vw); height: 100%;
        border-right: 1px solid var(--vp-line); box-shadow: 0 10px 40px rgba(0, 0, 0, .18);
        transform: translateX(-105%); visibility: hidden; transition: transform .2s ease, visibility 0s linear .2s;
    }
    body.vp-drawer-open .vp-sidebar { transform: none; visibility: visible; transition: transform .2s ease; }
    .vp-scrim { position: fixed; inset: 0; z-index: 1040; background: rgba(23, 44, 56, .45); }
    .vp-collapse-toggle { display: none; }
    .vp-drawer-close, .vp-menu-button { display: inline-grid; }
    .vp-content { padding: 24px 16px 38px; }
    .vp-topbar { padding: 10px 16px; }
    .vp-footer { padding: 16px; }
    .vp-user-role { display: none; }
}

@media (prefers-reduced-motion: reduce) {
    .vp-sidebar, .vp-chevron { transition: none !important; }
}