:root {
  --header-height: var(--space-12);
  --nav-height: 56px;
}

.app-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: calc(var(--header-height) + env(safe-area-inset-top, 0));
  padding-top: env(safe-area-inset-top, 0);
  background: var(--bg-primary);
  border-bottom: 1px solid var(--border-default);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-left: var(--space-4);
  padding-right: var(--space-4);
  z-index: 100;
  -webkit-user-select: none;
  user-select: none;
}

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

.app-header .header-icon {
  width: 20px;
  height: 20px;
  color: var(--accent-coral);
}

.app-header .header-title {
  font-size: var(--text-h3);
  font-weight: 700;
  color: var(--accent-coral);
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.app-header .header-version {
  font-size: var(--text-caption);
  color: var(--text-muted);
  font-variant-numeric: tabular-nums;
}

.app-nav {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  height: var(--nav-height);
  background: var(--bg-primary);
  border-top: 1px solid var(--border-default);
  display: flex;
  align-items: center;
  justify-content: space-around;
  padding-bottom: env(safe-area-inset-bottom, 0);
  z-index: 100;
}

.app-nav .nav-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-1);
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-md);
  color: var(--text-muted);
  text-decoration: none;
  transition: color 0.15s ease, background 0.15s ease;
  min-width: 64px;
}

.app-nav .nav-item:active {
  background: var(--bg-secondary);
}

.app-nav .nav-item.active {
  color: var(--accent-coral);
  background: var(--accent-coral-glow);
}

.app-nav .nav-item .nav-icon {
  width: 24px;
  height: 24px;
}

.app-nav .nav-item .nav-label {
  font-size: var(--text-label);
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.app-main {
  padding-top: calc(var(--header-height) + env(safe-area-inset-top, 0));
  padding-bottom: calc(var(--nav-height) + env(safe-area-inset-bottom, 0));
  min-height: 100vh;
  min-height: 100dvh;
}

.app-main.no-nav {
  padding-bottom: calc(var(--header-height) + env(safe-area-inset-top, 0));
}