/* Application shell */
.app-shell {
    min-height: 100vh;
    display: grid;
    grid-template-columns: minmax(0, 1fr);
    grid-template-rows: var(--header-height) minmax(0, 1fr);
    grid-template-areas:
        "header"
        "main";
}

/* Header */
.app-header {
    grid-area: header;
    position: sticky;
    top: 0;
    z-index: 40;
    min-width: 0;
    min-height: var(--header-height);
    padding: env(safe-area-inset-top) var(--space-4) 0;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-3);
    color: var(--color-text-inverse);
    background: var(--color-sidebar);
    box-shadow: var(--shadow-header);
}

.app-header__actions {
    min-width: 0;
    display: flex;
    align-items: center;
    justify-content: flex-end;
    gap: var(--space-1);
}

/* Sidebar */
.sidebar {
    display: none;
}

/* Main content */
.main-content {
    grid-area: main;
    min-width: 0;
    padding: var(--space-4);
    background: var(--color-app-background);
}

.page-container {
    width: 100%;
    max-width: none;
    margin-inline: 0;
}

.page-stack {
    display: grid;
    gap: var(--space-4);
}

/* Drawer layer */
.drawer-layer {
    position: fixed;
    inset: 0;
    z-index: 100;
    display: grid;
    grid-template-columns: var(--drawer-width) minmax(0, 1fr);
}

.drawer-overlay {
    grid-column: 1 / -1;
    grid-row: 1;
    width: 100%;
    min-height: 100%;
    background: var(--color-overlay);
    cursor: pointer;
}

.mobile-drawer {
    grid-column: 1;
    grid-row: 1;
    z-index: 1;
    width: var(--drawer-width);
    min-height: 100%;
    max-height: 100vh;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    color: var(--color-text-inverse);
    background: var(--color-sidebar);
    box-shadow: var(--shadow-drawer);
}

/* Yii page content inside the new shell */
.page-content {
    min-width: 0;
}

.guest-shell {
    min-height: 100vh;
    display: grid;
    grid-template-rows: var(--header-height) minmax(0, 1fr);
}

.guest-shell .app-header {
    grid-area: auto;
}

.guest-header__brand {
    color: var(--color-text-inverse);
    font-size: var(--font-size-lg);
    font-weight: 700;
    letter-spacing: -0.02em;
}

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