/* ============================================================
   layout.css — Header, sidebar, overlay, main content, footer
   ============================================================ */

/* ── Wrapper ── */
.layout-wrapper {
    min-height: 100vh;
}

/* ── Header ── */
.layout-header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    z-index: 30;
    height: var(--header-height);
    background: var(--color-surface);
    border-bottom: 1px solid var(--color-border);
    box-shadow: var(--shadow-sm);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 var(--space-4);
}

@media (min-width: 1024px) {
    .layout-header {
        padding: 0 var(--space-6);
    }
}

.layout-header__brand {
    display: flex;
    align-items: center;
    gap: var(--space-3);
}

.layout-header__app-name {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    font-size: 1.125rem;
    font-weight: 700;
    color: var(--color-text);
    letter-spacing: -0.01em;
}

.layout-header__company-logo {
    max-height: 2rem;
    max-width: 10rem;
    width: auto;
    object-fit: contain;
    display: block;
}

.layout-header__actions {
    display: flex;
    align-items: center;
    gap: var(--space-3);
}

.layout-header__user-email {
    display: none;
    font-size: 0.875rem;
    color: var(--color-text-muted);
    max-width: 200px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

@media (min-width: 640px) {
    .layout-header__user-email {
        display: inline;
    }
}

/* ── Sidebar toggle button ── */
.sidebar-toggle {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 36px;
    height: 36px;
    border-radius: var(--radius-md);
    border: none;
    background: transparent;
    color: var(--color-text-muted);
    cursor: pointer;
    transition: background var(--transition), color var(--transition);
    flex-shrink: 0;
}

.sidebar-toggle:hover {
    background: var(--color-bg);
    color: var(--color-text);
}

.sidebar-toggle:focus-visible {
    outline: 2px solid var(--color-text-muted);
    outline-offset: 2px;
}

/* Icon swap via aria-expanded */
.sidebar-toggle #icon-close {
    display: none;
}

.sidebar-toggle[aria-expanded="true"] #icon-menu {
    display: none;
}

.sidebar-toggle[aria-expanded="true"] #icon-close {
    display: block;
}

/* Hide toggle on desktop */
@media (min-width: 1024px) {
    .sidebar-toggle {
        display: none;
    }
}

/* ── Mobile overlay ── */
.layout-overlay {
    display: none;
    position: fixed;
    inset: 0;
    z-index: 20;
    background: rgba(0, 0, 0, 0.4);
}

.layout-overlay.is-open {
    display: block;
}

@media (min-width: 1024px) {
    .layout-overlay {
        display: none !important;
    }
}

/* ── Sidebar ── */
.layout-sidebar {
    position: fixed;
    top: 0;
    left: 0;
    z-index: 25;
    width: var(--sidebar-width);
    height: 100%;
    background: var(--color-nav-bg);
    color: var(--color-nav-text);
    display: flex;
    flex-direction: column;
    transform: translateX(-100%);
    transition: transform var(--transition-speed) ease-in-out;
    will-change: transform;
}

.layout-sidebar.is-open {
    transform: translateX(0);
}

@media (min-width: 1024px) {
    .layout-sidebar {
        transform: translateX(0);
        top: var(--header-height);
        height: calc(100% - var(--header-height));
    }
}

/* Mobile brand row (shown only when sidebar covers the header) */
.layout-sidebar__brand {
    display: flex;
    align-items: center;
    height: var(--header-height);
    padding: 0 var(--space-5);
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
    flex-shrink: 0;
    font-size: 1.125rem;
    font-weight: 700;
    letter-spacing: -0.01em;
    color: var(--color-nav-active-text, #ffffff);
}

@media (min-width: 1024px) {
    .layout-sidebar__brand {
        display: none;
    }
}

/* Scrollable nav area */
.layout-sidebar__nav {
    flex: 1;
    overflow-y: auto;
    padding: var(--space-4) var(--space-3);
}

/* Sidebar footer */
.layout-sidebar__footer {
    flex-shrink: 0;
    padding: var(--space-4);
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    font-size: 0.75rem;
    color: var(--color-text-subtle);
}

/* ── Nav list ── */
.nav-list {
    display: flex;
    flex-direction: column;
    gap: var(--space-1);
}

.nav-item a {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-2) var(--space-3);
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--color-nav-text);
    transition: background var(--transition), color var(--transition);
}

.nav-item a:hover,
.nav-item a.is-active {
    background: var(--color-nav-active-bg);
    color: var(--color-nav-active-text);
}

/* Not-yet-built nav items: same box model as an active link so the label lines
   up exactly with the real items, greyed out and non-interactive. Global (was
   instructor-only) so the owner sidebar renders them identically. */
.nav-item--disabled span[aria-disabled] {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: var(--space-2) var(--space-3);
    border-radius: var(--radius-md);
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--color-nav-text);
    opacity: 0.45;
    cursor: not-allowed;
}

.nav-item__soon {
    margin-left: auto;
    font-size: 0.65rem;
    font-style: normal;
    text-transform: uppercase;
    letter-spacing: 0.03em;
}

/* ── Main content ── */
.layout-main {
    min-height: 100vh;
    padding-top: var(--header-height);
}

@media (min-width: 1024px) {
    .layout-main {
        padding-left: var(--sidebar-width);
    }
}

.layout-main__inner {
    padding: var(--space-6) var(--space-4);
    max-width: 1280px;
}

@media (min-width: 640px) {
    .layout-main__inner {
        padding-inline: var(--space-6);
    }
}

@media (min-width: 1024px) {
    .layout-main__inner {
        padding-inline: var(--space-8);
    }
}

/* ── Footer ── */
.layout-footer {
    margin-top: var(--space-8);
    padding-top: var(--space-6);
    border-top: 1px solid var(--color-border);
}

.layout-footer__text {
    font-size: 0.75rem;
    color: var(--color-text-subtle);
    text-align: center;
}

/* ── Scroll lock when sidebar is open ── */
body.sidebar-open {
    overflow: hidden;
}

/* ============================================================
   Public marketing site chrome — signed-out header, mobile nav,
   footer. Namespaced `.site-*` so it never touches the dashboard
   app-shell above.
   ============================================================ */

/* ── Page scaffold ── */
.site {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    background: var(--color-surface);
}

.site-container {
    width: 100%;
    max-width: var(--site-container);
    margin-inline: auto;
    padding-inline: var(--site-gutter);
}

.site-main {
    flex: 1 0 auto;
}

/* Skip link for keyboard users */
.site-skip-link {
    position: absolute;
    left: var(--space-4);
    top: -4rem;
    z-index: 100;
    padding: var(--space-2) var(--space-4);
    background: var(--color-primary);
    color: var(--color-on-primary, #fff);
    border-radius: var(--radius-md);
    transition: top var(--transition);
}

.site-skip-link:focus {
    top: var(--space-4);
}

/* ── Header ── */
.site-header {
    position: sticky;
    top: 0;
    z-index: 40;
    background: color-mix(in srgb, var(--color-surface) 88%, transparent);
    backdrop-filter: saturate(180%) blur(8px);
    border-bottom: 1px solid transparent;
    transition: border-color var(--transition), box-shadow var(--transition);
}

.site-header.is-scrolled {
    border-bottom-color: var(--color-border);
    box-shadow: var(--shadow-sm);
}

.site-header__inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-6);
    height: var(--site-header-height);
}

.site-brand {
    display: inline-flex;
    align-items: center;
    gap: var(--space-2);
    font-size: 1.25rem;
    font-weight: 700;
    letter-spacing: -0.02em;
    color: var(--color-text);
    flex-shrink: 0;
}

.site-brand__mark {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 32px;
    height: 32px;
    border-radius: var(--radius-md);
    background: var(--color-primary);
    color: var(--color-on-primary, #fff);
    font-size: 0.95rem;
    font-weight: 700;
}

/* Primary nav (desktop) */
.site-nav {
    display: none;
}

.site-nav__list {
    display: flex;
    align-items: center;
    gap: clamp(1rem, 2.5vw, 2rem);
}

.site-nav__link {
    font-size: 0.9375rem;
    font-weight: 500;
    color: var(--color-text-muted);
    transition: color var(--transition);
}

.site-nav__link:hover,
.site-nav__link:focus-visible {
    color: var(--color-text);
}

.site-header__actions {
    display: none;
    align-items: center;
    gap: var(--space-4);
    flex-shrink: 0;
}

.site-header__signin {
    font-size: 0.9375rem;
    font-weight: 500;
    color: var(--color-text-muted);
    transition: color var(--transition);
    /* Reset so it reads identically whether rendered as <a> or as the
       logout <button> (which posts a CSRF-protected form). */
    background: none;
    border: none;
    padding: 0;
    font-family: inherit;
    cursor: pointer;
}

.site-header__signin:hover {
    color: var(--color-text);
}

/* Logout form wrapper — keep it inline so the button aligns with the
   adjacent action, and let its button stretch inside the mobile panel. */
.site-logout-form {
    display: inline-flex;
    margin: 0;
}

.site-mobile-nav__actions .site-logout-form {
    display: flex;
    width: 100%;
}

@media (min-width: 900px) {
    .site-nav,
    .site-header__actions {
        display: flex;
    }
}

/* Mobile menu toggle */
.site-menu-toggle {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 44px;
    height: 44px;
    border: none;
    background: transparent;
    color: var(--color-text);
    border-radius: var(--radius-md);
    cursor: pointer;
    flex-shrink: 0;
}

.site-menu-toggle:hover {
    background: var(--site-panel);
}

.site-menu-toggle #site-icon-close {
    display: none;
}

@media (min-width: 900px) {
    .site-menu-toggle {
        display: none;
    }
}

/* ── Mobile navigation panel ── */
.site-mobile-nav {
    position: fixed;
    inset: var(--site-header-height) 0 0;
    z-index: 39;
    background: var(--color-surface);
    padding: var(--space-6) var(--site-gutter) var(--space-10);
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
    transform: translateY(-8px);
    opacity: 0;
    visibility: hidden;
    transition: opacity var(--transition), transform var(--transition), visibility var(--transition);
    overflow-y: auto;
}

.site-mobile-nav.is-open {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
}

.site-mobile-nav__link {
    padding: var(--space-3) 0;
    font-size: 1.125rem;
    font-weight: 500;
    color: var(--color-text);
    border-bottom: 1px solid var(--color-border);
}

.site-mobile-nav__actions {
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
    margin-top: var(--space-6);
}

@media (min-width: 900px) {
    .site-mobile-nav {
        display: none;
    }
}

body.site-menu-open {
    overflow: hidden;
}

/* ── Footer ── */
.site-footer {
    flex-shrink: 0;
    background: var(--color-bg);
    border-top: 1px solid var(--color-border);
    padding-block: clamp(2.5rem, 6vw, 4rem) var(--space-8);
}

.site-footer__top {
    display: grid;
    grid-template-columns: 1fr;
    gap: clamp(2rem, 5vw, 3rem);
}

@media (min-width: 640px) {
    .site-footer__top {
        grid-template-columns: 2fr 1fr 1fr;
    }
}

@media (min-width: 900px) {
    .site-footer__top {
        grid-template-columns: 2.4fr 1fr 1fr 1fr;
    }
}

.site-footer__brandcol {
    max-width: 22rem;
}

.site-footer__tagline {
    margin-top: var(--space-4);
    font-size: 0.9375rem;
    line-height: 1.65;
    color: var(--color-text-muted);
}

.site-footer__col-title {
    font-size: 0.8125rem;
    font-weight: 600;
    letter-spacing: 0.06em;
    text-transform: uppercase;
    color: var(--color-text-subtle);
    margin-bottom: var(--space-4);
}

.site-footer__links {
    display: flex;
    flex-direction: column;
    gap: var(--space-3);
}

.site-footer__link {
    font-size: 0.9375rem;
    color: var(--color-text-muted);
    transition: color var(--transition);
}

.site-footer__link:hover {
    color: var(--color-text);
}

.site-footer__bottom {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-4);
    margin-top: clamp(2.5rem, 6vw, 3.5rem);
    padding-top: var(--space-6);
    border-top: 1px solid var(--color-border);
}

.site-footer__copy {
    font-size: 0.875rem;
    color: var(--color-text-subtle);
}

.site-footer__social {
    display: flex;
    gap: var(--space-2);
}

.site-footer__social-link {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 38px;
    height: 38px;
    border-radius: var(--radius-md);
    border: 1px solid var(--color-border);
    color: var(--color-text-muted);
    transition: color var(--transition), border-color var(--transition), background var(--transition);
}

.site-footer__social-link:hover {
    color: var(--color-text);
    background: var(--color-surface);
}