/* ==========================================================================
   App shell layout: header, sidebar (desktop) / bottom-nav + drawer (mobile)
   ========================================================================== */

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

/* ---- Header ---- */
.app-header {
  position: sticky;
  top: 0;
  z-index: var(--z-header);
  height: var(--header-height);
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: 0 var(--space-4);
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
}

.app-header__brand {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-weight: var(--font-weight-bold);
  font-size: var(--font-size-md);
  color: var(--color-text);
  white-space: nowrap;
}

.app-header__brand-mark {
  width: 32px;
  height: 32px;
  border-radius: var(--radius-md);
  background: var(--color-primary-soft);
  color: var(--color-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.app-header__search {
  flex: 1;
  max-width: 420px;
}

.app-header__actions {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  margin-left: auto;
}

.app-header__menu-btn {
  display: inline-flex;
}

/* ---- Sidebar (desktop) ---- */
.app-sidebar {
  display: none;
  flex-direction: column;
  width: var(--sidebar-width);
  flex-shrink: 0;
  background: var(--color-surface);
  border-right: 1px solid var(--color-border);
  padding: var(--space-4) var(--space-3);
  position: sticky;
  top: 0;
  height: 100vh;
  overflow-y: auto;
}

.app-nav__list {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.app-nav__link {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-md);
  color: var(--color-text-muted);
  font-weight: var(--font-weight-medium);
  transition: background var(--transition-fast), color var(--transition-fast);
}

.app-nav__link:hover {
  background: var(--color-surface-alt);
  color: var(--color-text);
}

.app-nav__link[aria-current="page"] {
  background: var(--color-primary-soft);
  color: var(--color-primary);
}

.app-nav__icon {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
}

/* ---- Main content ---- */
.app-main {
  flex: 1;
  min-width: 0;
  padding: var(--space-5) var(--space-4) calc(var(--bottom-nav-height) + var(--space-8));
}

.container {
  max-width: var(--container-max);
  margin: 0 auto;
}

.page-header {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: var(--space-3);
  margin-bottom: var(--space-5);
}

.page-header__title {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-bold);
  line-height: var(--line-height-tight);
}

.page-header__subtitle {
  color: var(--color-text-muted);
  margin-top: var(--space-1);
}

/* ---- Mobile drawer ---- */
.drawer-overlay {
  position: fixed;
  inset: 0;
  background: rgba(15, 23, 22, 0.45);
  z-index: var(--z-drawer);
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-base);
}

.drawer-overlay.is-open {
  opacity: 1;
  pointer-events: auto;
}

.app-drawer {
  position: fixed;
  top: 0;
  left: 0;
  bottom: 0;
  width: min(80vw, 300px);
  background: var(--color-surface);
  z-index: var(--z-drawer);
  transform: translateX(-100%);
  transition: transform var(--transition-base);
  padding: var(--space-4);
  overflow-y: auto;
}

.app-drawer.is-open {
  transform: translateX(0);
}

.app-drawer__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-4);
}

/* ---- Bottom navigation (mobile) ---- */
.bottom-nav {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  height: var(--bottom-nav-height);
  background: var(--color-surface);
  border-top: 1px solid var(--color-border);
  display: flex;
  z-index: var(--z-header);
  padding-bottom: env(safe-area-inset-bottom, 0);
}

.bottom-nav__link {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 2px;
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
}

.bottom-nav__link[aria-current="page"] {
  color: var(--color-primary);
}

.bottom-nav__icon {
  width: 22px;
  height: 22px;
}

/* ---- Grid helpers ---- */
.grid {
  display: grid;
  gap: var(--space-4);
}

.grid--stats {
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
}

.grid--cards {
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
}

.grid--two-col {
  grid-template-columns: 1fr;
}

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

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

/* ---- Desktop layout activation ---- */
@media (min-width: 1024px) {
  .app-sidebar {
    display: flex;
  }

  .bottom-nav,
  .app-header__menu-btn {
    display: none;
  }

  .app-main {
    padding: var(--space-8) var(--space-8) var(--space-10);
  }

  .grid--two-col {
    grid-template-columns: 2fr 1fr;
  }
}