/* Left navigation: fixed sidebar on desktop (collapsible to an icon rail), drawer on mobile. */
:root {
    --sidebar-width: 248px;
    --sidebar-rail: 68px;
    --sidebar-bg: #f5f6f7;
    --sidebar-text: #303436;
    --sidebar-muted: #6b7175;
}

.app-sidebar {
    position: fixed;
    inset: 0 auto 0 0;
    z-index: 60;
    display: flex;
    flex-direction: column;
    width: var(--sidebar-width);
    border-right: 1px solid var(--color-border);
    background: var(--sidebar-bg);
    color: var(--sidebar-text);
    font-family: var(--font-interface);
    transition: width .18s ease, transform .2s ease;
}

.app-sidebar-head {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 8px;
    min-height: 77px;
    padding: 0 14px 0 18px;
    border-bottom: 1px solid var(--color-border);
    box-sizing: border-box;
}

.app-sidebar-brand {
    display: inline-flex;
    align-items: center;
    gap: 9px;
    min-width: 0;
    color: var(--color-text);
    font-family: Arial, sans-serif;
    font-size: 23px;
    font-weight: 700;
    letter-spacing: -.02em;
}

.app-sidebar-brand img { width: 30px; height: 30px; flex: 0 0 30px; }

.app-sidebar-toggle,
.app-sidebar-open {
    display: inline-grid;
    place-items: center;
    flex: 0 0 34px;
    width: 34px;
    height: 34px;
    padding: 0;
    border: 0;
    border-radius: 6px;
    background: transparent;
    color: var(--sidebar-muted);
    cursor: pointer;
}

.app-sidebar-toggle:hover,
.app-sidebar-open:hover { background: #e7e9eb; color: var(--color-text); }

.app-sidebar svg,
.app-sidebar-open svg {
    width: 20px;
    height: 20px;
    fill: none;
    stroke: currentColor;
    stroke-width: 1.7;
    stroke-linecap: round;
    stroke-linejoin: round;
}

.app-sidebar-nav {
    flex: 1;
    overflow-x: hidden;
    overflow-y: auto;
    padding: 4px 10px 24px;
    scrollbar-width: thin;
}

.app-sidebar-label {
    margin: 18px 10px 6px;
    color: var(--sidebar-muted);
    font-size: 13px;
    font-weight: 600;
    white-space: nowrap;
}

.app-sidebar-label:first-child { margin-top: 4px; }

.app-sidebar-link {
    display: flex;
    align-items: center;
    gap: 13px;
    min-height: 40px;
    margin-bottom: 2px;
    padding: 0 12px;
    border-radius: 8px;
    color: var(--sidebar-text);
    font-size: 15.5px;
    font-weight: 500;
    white-space: nowrap;
}

.app-sidebar-link svg { flex: 0 0 20px; color: var(--sidebar-muted); }
.app-sidebar-link span { overflow: hidden; text-overflow: ellipsis; }
.app-sidebar-link:hover { background: #eceef0; }

.app-sidebar-link.active {
    background: #fff;
    box-shadow: 0 1px 3px rgba(0, 0, 0, .1);
    color: var(--color-text);
    font-weight: 600;
}

.app-sidebar-link.active svg { color: var(--color-accent); }

.app-sidebar a:focus-visible,
.app-sidebar button:focus-visible { outline: 2px solid var(--color-accent); outline-offset: 1px; }

.app-main {
    min-width: 0;
    margin-left: var(--sidebar-width);
    transition: margin-left .18s ease;
}

/* Top bar: the landing's search, on every page (plus the menu button on mobile). */
.platform-theme .site-header { background: #f7f7f7; border-bottom: 1px solid var(--color-border); }
.platform-theme .site-header-inner { grid-template-columns: auto auto minmax(0, 1fr) auto; min-height: 76px; gap: 12px; padding: 0; }
.platform-theme .site-header a:focus-visible { outline-color: var(--color-accent); }
.site-header-search { grid-column: 3; min-width: 0; }
.site-header-search .home-search-hero { width: min(100%, 1080px); margin: 0; padding: 12px 0; background: none; border: 0; }
.site-header-search .home-search-field-wrap { width: 100%; max-width: none; }
.site-header-search .home-search-hero .home-search-field { min-height: 52px; padding: 0 140px 0 20px; border: 1px solid #b9bec3; border-radius: 4px; background: #fff; box-shadow: 0 3px 12px #25252508; font-size: 18px; }
.site-header-search .home-search-field::placeholder { color: #656565; }
.site-header-search .home-search-field:focus { outline: 2px solid var(--color-accent); outline-offset: 2px; box-shadow: none; }
.site-header-search .home-search-actions .home-search-button { width: 40px; height: 40px; border-radius: 3px; background: var(--color-accent); }
.site-header-search .home-search-actions .home-search-button:hover { background: var(--color-accent-hover); }
.site-header-search .home-search-button:focus-visible { outline: 2px solid var(--color-accent); outline-offset: 3px; }
.site-header-search .search-shortcut { background: #fff; color: #656565; border-color: #dedede; border-radius: 3px; }
.site-header-search .universal-search-panel { color: var(--color-text); text-align: left; }
.site-header .site-brand,
.app-sidebar-open,
.app-sidebar-backdrop { display: none; }

/* Light/dark toggle, always on the first header row. */
.theme-toggle {
    display: inline-grid;
    place-items: center;
    grid-column: 4;
    grid-row: 1;
    justify-self: end;
    width: 40px;
    height: 40px;
    padding: 0;
    border: 1px solid var(--color-border);
    border-radius: 4px;
    background: var(--color-surface);
    color: var(--color-text-secondary);
    cursor: pointer;
}
.theme-toggle:hover { color: var(--color-text); border-color: var(--color-text-secondary); }
.theme-toggle:focus-visible { outline: 2px solid var(--color-accent); outline-offset: 2px; }
.theme-toggle svg { width: 20px; height: 20px; fill: none; stroke: currentColor; stroke-width: 1.7; stroke-linecap: round; stroke-linejoin: round; }
.theme-toggle-sun,
[data-theme="dark"] .theme-toggle-moon { display: none; }
[data-theme="dark"] .theme-toggle-sun { display: block; }

/* Desktop collapsed: icon rail. */
@media (min-width: 1025px) {
    .sidebar-collapsed .app-sidebar { width: var(--sidebar-rail); }
    .sidebar-collapsed .app-main { margin-left: var(--sidebar-rail); }
    .sidebar-collapsed .app-sidebar-head { flex-direction: column; justify-content: center; gap: 4px; padding: 0; }
    .sidebar-collapsed .app-sidebar-brand .brand-wordmark,
    .sidebar-collapsed .app-sidebar-link span { display: none; }
    .sidebar-collapsed .app-sidebar-toggle svg { transform: scaleX(-1); }
    .sidebar-collapsed .app-sidebar-label { height: 1px; margin: 12px 8px; overflow: hidden; background: var(--color-border); color: transparent; }
    .sidebar-collapsed .app-sidebar-link { justify-content: center; padding: 0; }
}

/* Mobile: off-canvas drawer. */
@media (max-width: 1024px) {
    .app-main { margin-left: 0; }
    .app-sidebar { width: min(280px, 85vw); transform: translateX(-100%); box-shadow: none; }
    .sidebar-open .app-sidebar { transform: none; box-shadow: 8px 0 30px rgba(0, 0, 0, .15); }
    .app-sidebar-open { display: inline-grid; }
    .site-header .site-brand { display: inline-flex; color: var(--color-text); font-size: 24px; font-weight: 700; }
    .site-header .site-brand-mark { width: 30px; height: 30px; flex-basis: 30px; }
    .platform-theme .site-header-inner { padding-top: 10px; row-gap: 0; }
    .site-header-search { grid-column: 1 / -1; }
    .sidebar-open .app-sidebar-backdrop {
        display: block;
        position: fixed;
        inset: 0;
        z-index: 55;
        border: 0;
        background: rgba(0, 0, 0, .3);
    }
    .sidebar-open body { overflow: hidden; }
}

@media (max-width: 640px) {
    .site-header-search .home-search-hero .home-search-field { min-height: 48px; padding: 0 56px 0 14px; font-size: 16px; }
    .site-header-search .home-search-actions { right: 5px; }
    .site-header-search .home-search-actions .search-shortcut { display: none; }
}

@media (prefers-reduced-motion: reduce) {
    .app-sidebar,
    .app-main { transition: none; }
}