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

.sidebar {
  position: fixed;
  inset: 0 auto 0 0;
  width: 260px;
  background: var(--sidebar-bg);
  border-right: 1px solid var(--color-border);
  display: flex;
  flex-direction: column;
  z-index: 100;
  transform: translateX(-100%);
  transition: transform var(--transition-base);
}

.sidebar.open {
  transform: translateX(0);
}

.sidebar-brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 1.25rem 1.5rem;
  border-bottom: 1px solid var(--color-border);
}

.brand-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
  background: var(--color-primary);
  color: var(--color-text-inverse);
}

.brand-name {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--color-text);
}

.sidebar-nav {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  padding: 1rem;
  flex: 1;
  overflow-y: auto;
}

.nav-item {
  display: flex;
  align-items: center;
  gap: 0.875rem;
  padding: 0.875rem 1rem;
  border-radius: var(--radius-md);
  color: var(--color-text-secondary);
  font-weight: 500;
  transition: background var(--transition-fast), color var(--transition-fast);
}

.nav-item:hover {
  background: var(--color-primary-soft);
  color: var(--color-primary);
}

.nav-item.active {
  background: var(--color-primary-soft);
  color: var(--color-primary);
}

.nav-item svg {
  flex-shrink: 0;
}

.main {
  flex: 1;
  display: flex;
  flex-direction: column;
  margin-left: 0;
  min-height: 100vh;
  min-height: 100dvh;
  padding-bottom: 72px;
}

.header {
  position: sticky;
  top: 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.875rem 1rem;
  background: var(--header-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--header-border);
  z-index: 50;
}

.header-menu {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
  color: var(--color-text);
  transition: background var(--transition-fast);
}

.header-menu:hover {
  background: var(--color-primary-soft);
}

.header-title {
  font-size: 1.25rem;
  font-weight: 700;
  flex: 1;
  text-align: left;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.content {
  flex: 1;
  padding: 1rem;
  max-width: 1200px;
  width: 100%;
  margin: 0 auto;
}

.bottom-nav {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  display: flex;
  align-items: center;
  gap: 0.125rem;
  padding: 0.5rem 0.5rem calc(0.5rem + env(safe-area-inset-bottom));
  background: var(--bottom-nav-bg);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-top: 1px solid var(--color-border);
  z-index: 50;
  overflow-x: auto;
  overflow-y: hidden;
  scrollbar-width: none;
  -webkit-overflow-scrolling: touch;
  scroll-snap-type: x proximity;
}

.bottom-nav::-webkit-scrollbar {
  display: none;
}

.bottom-nav-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.25rem;
  padding: 0.375rem 0.625rem;
  border-radius: var(--radius-md);
  color: var(--color-text-muted);
  font-size: 0.6875rem;
  font-weight: 500;
  white-space: nowrap;
  flex-shrink: 0;
  scroll-snap-align: center;
  transition: color var(--transition-fast), background var(--transition-fast);
}

.bottom-nav-item:hover,
.bottom-nav-item.active {
  color: var(--color-primary);
  background: var(--color-primary-soft);
}

.bottom-nav-item svg {
  width: 22px;
  height: 22px;
}

.overlay {
  position: fixed;
  inset: 0;
  background: var(--overlay);
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-base);
  z-index: 90;
}

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

@media (min-width: 768px) {
  .sidebar {
    position: relative;
    transform: translateX(0);
  }

  .main {
    margin-left: 0;
    padding-bottom: 0;
  }

  .header-menu {
    display: none;
  }

  .header {
    padding: 1rem 1.5rem;
  }

  .header-title {
    font-size: 1.5rem;
  }

  .content {
    padding: 1.5rem;
  }

  .bottom-nav {
    display: none;
  }

  .overlay {
    display: none;
  }
}