.app-header {
  background: var(--color-brand);
  color: var(--color-brand-ink);
  min-height: var(--header-h);
}

.app-header .brand,
.app-header .brand:hover {
  color: var(--color-brand-ink);
  font-size: var(--text-md);
  font-weight: 700;
}

.sidebar {
  background: var(--color-surface);
  border-right: 1px solid var(--color-border);
  width: var(--sidebar-w);
}

.sidebar a {
  min-height: 3rem;
  font-size: var(--text-sm);
  color: var(--color-ink);
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: 0.4rem var(--space-4);
}

.sidebar a.active {
  background: var(--color-accent-soft);
  color: var(--color-accent);
  box-shadow: inset 3px 0 0 var(--color-accent);
}

.sidebar .nav-icon {
  width: 1.5rem;
  font-size: 1.1rem;
  color: var(--color-ink-soft);
}

.main {
  margin-left: var(--sidebar-w);
  background: var(--color-canvas);
}

.phone-tabbar,
.more-sheet {
  display: none;
}

@media (max-width: 899px) {
  :root {
    --header-h: 3.5rem;
  }

  .hamburger {
    display: none;
  }

  .sidebar {
    display: none !important;
  }

  .main {
    margin-left: 0;
    padding-bottom: calc(4.5rem + env(safe-area-inset-bottom, 0px));
  }

  .phone-tabbar {
    display: flex;
    position: fixed;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 40;
    height: calc(4rem + env(safe-area-inset-bottom, 0px));
    padding-bottom: env(safe-area-inset-bottom, 0px);
    background: var(--color-brand);
    box-shadow: var(--shadow-md);
  }

  .phone-tabbar a,
  .phone-tabbar button {
    flex: 1 1 0;
    min-width: 0;
    min-height: 3rem;
    border: 0;
    background: transparent;
    color: var(--color-brand-ink);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 0.15rem;
    font-size: var(--text-xs);
    font-weight: 600;
    line-height: 1.2;
    text-decoration: none;
    padding: 0.25rem 0.1rem;
  }

  .phone-tabbar a i,
  .phone-tabbar button i {
    font-size: 1.25rem;
  }

  .phone-tabbar a.active,
  .phone-tabbar button[aria-expanded="true"] {
    background: rgba(255, 255, 255, 0.16);
    border-radius: var(--radius-pill);
    margin: 0.35rem 0.15rem;
  }

  .more-sheet {
    display: none;
    position: fixed;
    inset: 0;
    z-index: 50;
    background: var(--color-canvas);
    overflow: auto;
    padding: calc(var(--header-h) + var(--space-4)) var(--space-4) calc(5rem + env(safe-area-inset-bottom, 0px));
  }

  .more-sheet.is-open {
    display: block;
  }

  .more-sheet a {
    display: flex;
    align-items: center;
    min-height: 3rem;
    font-size: var(--text-md);
    font-weight: 700;
    color: var(--color-ink);
    text-decoration: none;
    border-bottom: 1px solid var(--color-border);
  }

  .more-sheet h2 {
    margin: var(--space-4) 0 var(--space-2);
    font-size: var(--text-lg);
  }
}

@media (min-width: 900px) {
  .phone-tabbar,
  .more-sheet {
    display: none !important;
  }
}