/* ============================================
   App Shell — sidebar + topbar layout
   ============================================ */

:root {
    --sidebar-width: 232px;
    --sidebar-width-collapsed: 64px;
    --topbar-height: 56px;
    --content-max: 1600px;
}

.app-shell {
    display: flex;
    width: 100%;
    min-height: 100vh;
}

/* --- Sidebar --- */

.sidebar {
    display: flex;
    flex-direction: column;
    width: var(--sidebar-width);
    min-width: var(--sidebar-width);
    background: var(--kerb-teal);
    color: var(--kerb-cream);
    position: sticky;
    top: 0;
    height: 100vh;
    overflow-y: auto;
    transition: width var(--transition-base), min-width var(--transition-base);
    z-index: 50;
}

.sidebar__brand {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-2);
    padding: var(--space-4) var(--space-4) var(--space-3);
}

.sidebar__logo {
    display: flex;
    align-items: center;
    gap: var(--space-2);
    color: var(--kerb-cream);
}

.sidebar__logo:hover { color: var(--kerb-white); }

.sidebar__logo-mark {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 40px;
    height: 40px;
    min-width: 40px;
    border-radius: var(--radius-full);
    background: var(--kerb-mint);
    color: var(--kerb-teal);
    font-family: var(--font-display);
    font-weight: 900;
    font-size: 0.72rem;
    letter-spacing: 0.02em;
}

.sidebar__logo-text {
    font-family: var(--font-display);
    font-weight: 900;
    font-size: var(--text-lg);
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

.sidebar__collapse {
    display: flex;
    align-items: center;
    justify-content: center;
    width: 26px;
    height: 26px;
    border: none;
    border-radius: var(--radius-sm);
    background: rgba(255, 255, 255, 0.08);
    color: var(--kerb-mint);
    cursor: pointer;
    transition: background var(--transition-fast);
}

.sidebar__collapse:hover { background: rgba(255, 255, 255, 0.18); }
.sidebar__collapse svg { width: 15px; height: 15px; transition: transform var(--transition-base); }

.sidebar__nav {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 2px;
    padding: var(--space-2) var(--space-3);
}

.sidebar__section {
    font-family: var(--font-display);
    font-size: 0.68rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.14em;
    color: var(--kerb-mint);
    opacity: 0.75;
    padding: var(--space-4) var(--space-2) var(--space-1);
    white-space: nowrap;
    overflow: hidden;
}

.sidebar__link {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    padding: 0.5rem var(--space-2);
    border-radius: var(--radius-md);
    color: var(--kerb-cream);
    font-size: var(--text-sm);
    font-weight: 600;
    line-height: 1.2;
    white-space: nowrap;
    transition: background var(--transition-fast), color var(--transition-fast);
}

.sidebar__link:hover {
    background: rgba(255, 255, 255, 0.1);
    color: var(--kerb-white);
}

.sidebar__link--active {
    background: var(--kerb-mint);
    color: var(--kerb-teal);
}

.sidebar__link--active:hover {
    background: var(--kerb-mint);
    color: var(--kerb-teal-dark);
}

.sidebar__icon {
    display: flex;
    align-items: center;
    justify-content: center;
    min-width: 20px;
}

.sidebar__icon svg { width: 18px; height: 18px; }

.sidebar__footer {
    padding: var(--space-3);
    border-top: 1px solid rgba(255, 255, 255, 0.12);
}

.sidebar__dev {
    display: flex;
    flex-direction: column;
    gap: var(--space-2);
}

.sidebar__dev-tag {
    align-self: flex-start;
    font-family: var(--font-display);
    font-size: 0.62rem;
    font-weight: 700;
    letter-spacing: 0.18em;
    color: var(--kerb-teal);
    background: var(--kerb-pink);
    border-radius: var(--radius-sm);
    padding: 1px 7px;
}

.sidebar__dev-select {
    width: 100%;
    font-size: 0.72rem;
    padding: 4px 6px;
    border-radius: var(--radius-sm);
    border: none;
    background: rgba(255, 255, 255, 0.92);
    color: var(--kerb-teal);
    cursor: pointer;
}

.sidebar__dev-link {
    font-size: 0.72rem;
    font-weight: 700;
    color: var(--kerb-mint);
}

.sidebar__dev-link:hover { color: var(--kerb-white); }

/* --- Collapsed state --- */

.sidebar-collapsed .sidebar {
    width: var(--sidebar-width-collapsed);
    min-width: var(--sidebar-width-collapsed);
}

.sidebar-collapsed .sidebar__logo-text,
.sidebar-collapsed .sidebar__label,
.sidebar-collapsed .sidebar__dev-select,
.sidebar-collapsed .sidebar__dev-link {
    display: none;
}

.sidebar-collapsed .sidebar__section {
    padding-left: 0;
    padding-right: 0;
    text-align: center;
    font-size: 0.55rem;
}

.sidebar-collapsed .sidebar__brand {
    flex-direction: column;
    gap: var(--space-2);
    padding-left: 0;
    padding-right: 0;
}

.sidebar-collapsed .sidebar__link {
    justify-content: center;
    padding: 0.55rem 0;
}

.sidebar-collapsed .sidebar__collapse svg { transform: rotate(180deg); }
.sidebar-collapsed .sidebar__dev { align-items: center; }

/* --- Main column --- */

.app-main {
    flex: 1;
    display: flex;
    flex-direction: column;
    min-width: 0;
    min-height: 100vh;
}

.topbar {
    display: flex;
    align-items: center;
    gap: var(--space-4);
    height: var(--topbar-height);
    padding: 0 var(--space-6);
    background: var(--kerb-cream);
    border-bottom: 2px solid var(--gray-200);
    position: sticky;
    top: 0;
    z-index: 40;
}

.topbar__menu {
    display: none;
    align-items: center;
    justify-content: center;
    width: 34px;
    height: 34px;
    border: none;
    border-radius: var(--radius-sm);
    background: transparent;
    color: var(--kerb-teal);
    cursor: pointer;
}

.topbar__menu svg { width: 20px; height: 20px; }

.topbar__crumb {
    font-family: var(--font-display);
    font-weight: 900;
    text-transform: uppercase;
    letter-spacing: 0.04em;
    color: var(--kerb-teal);
    font-size: var(--text-sm);
    flex: 1;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}

.topbar__user {
    display: flex;
    align-items: center;
    gap: var(--space-3);
    margin-left: auto;
}

.topbar__user-name {
    font-weight: 700;
    font-size: var(--text-sm);
    color: var(--kerb-teal);
}

.topbar__user-role {
    font-family: var(--font-display);
    font-size: 0.62rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.12em;
    color: var(--kerb-teal);
    background: var(--kerb-mint);
    border-radius: var(--radius-full);
    padding: 2px 10px;
}

.content {
    flex: 1;
    width: 100%;
    max-width: var(--content-max);
    padding: var(--space-6) var(--space-6) var(--space-10);
}

.content--public {
    max-width: 1100px;
    margin: 0 auto;
    padding-top: var(--space-10);
}

/* --- Public (logged-out) shell --- */

.public-shell {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    width: 100%;
}

.public-nav {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: var(--space-3) var(--space-8);
    border-bottom: 2px solid var(--gray-200);
    background: var(--kerb-cream);
}

.public-nav__logo {
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

.public-nav__logo .sidebar__logo-mark {
    background: var(--kerb-teal);
    color: var(--kerb-mint);
}

.public-nav__text {
    font-family: var(--font-display);
    font-weight: 900;
    font-size: var(--text-lg);
    text-transform: uppercase;
    color: var(--kerb-teal);
    letter-spacing: 0.04em;
}

/* --- Mobile --- */

.sidebar-scrim {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(26, 26, 26, 0.45);
    z-index: 45;
}

@media (max-width: 860px) {
    .sidebar {
        position: fixed;
        left: 0;
        top: 0;
        bottom: 0;
        transform: translateX(-100%);
        transition: transform var(--transition-base);
        width: var(--sidebar-width) !important;
        min-width: var(--sidebar-width) !important;
    }

    .sidebar-mobile-open .sidebar { transform: translateX(0); }
    .sidebar-mobile-open .sidebar-scrim { display: block; }

    /* Collapsed mode is meaningless off-canvas */
    .sidebar-collapsed .sidebar__logo-text,
    .sidebar-collapsed .sidebar__label,
    .sidebar-collapsed .sidebar__dev-select,
    .sidebar-collapsed .sidebar__dev-link { display: initial; }
    .sidebar-collapsed .sidebar__link { justify-content: flex-start; padding: 0.5rem var(--space-2); }
    .sidebar__collapse { display: none; }

    .topbar__menu { display: flex; }
    .topbar { padding: 0 var(--space-4); }
    .topbar__user-name { display: none; }
    .content { padding: var(--space-4) var(--space-4) var(--space-8); }
}

/* --- Error pages --- */

.error-page {
    text-align: center;
    padding: var(--space-16) var(--space-4);
    max-width: 480px;
    margin: 0 auto;
}

.error-page h1 {
    font-size: clamp(4rem, 10vw, 6rem);
    color: var(--kerb-pink);
}

.error-page p {
    margin: var(--space-4) 0 var(--space-6);
    color: var(--gray-600);
}