.app-header {
  position: sticky;
  top: 0;
  z-index: 30;
  background: #ffffff;
  border-bottom: 1px solid var(--color-border);
}

.app-header__inner {
  display: flex;
  align-items: center;
  gap: var(--space-6);
  max-width: var(--content-max-width);
  height: var(--header-height);
  margin: 0 auto;
  padding: 0 var(--space-6);
}

.brand {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  min-width: 0;
}

.brand__back {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border-radius: var(--radius-md);
  color: var(--color-text-muted);
}

.brand__back:hover {
  background: var(--color-surface-hover);
  color: var(--color-text);
  text-decoration: none;
}

.brand__mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border-radius: var(--radius-md);
  background: var(--color-accent);
  color: #fff;
}

.brand__text {
  display: flex;
  flex-direction: column;
  line-height: 1.15;
}

.brand__product {
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
  font-weight: 500;
}

.brand__title {
  font-size: var(--font-size-md);
  font-weight: 600;
}

.primary-nav {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  height: 100%;
  overflow-x: auto;
  scrollbar-width: none;
}

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

.primary-nav__link {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  height: 100%;
  padding: 0 var(--space-3);
  color: var(--color-text-secondary);
  font-weight: 500;
  white-space: nowrap;
}

.primary-nav__link:hover {
  color: var(--color-text);
  text-decoration: none;
}

.primary-nav__link.is-active {
  color: var(--color-accent);
}

.primary-nav__link.is-active::after {
  content: "";
  position: absolute;
  left: var(--space-3);
  right: var(--space-3);
  bottom: -1px;
  height: 2px;
  border-radius: 2px 2px 0 0;
  background: var(--color-accent);
}

.app-header__meta {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--font-size-xs);
  color: var(--color-text-muted);
  white-space: nowrap;
}

.live-indicator {
  width: 8px;
  height: 8px;
  border-radius: var(--radius-full);
  background: #17b26a;
  box-shadow: 0 0 0 3px rgba(23, 178, 106, 0.18);
}

.app-main {
  max-width: var(--content-max-width);
  margin: 0 auto;
  padding: var(--space-8) var(--space-6) var(--space-10);
}

.page-header {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: var(--space-4);
  margin-bottom: var(--space-6);
  flex-wrap: wrap;
}

.page-title {
  font-size: var(--font-size-2xl);
  font-weight: 650;
}

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

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

.stack {
  display: flex;
  flex-direction: column;
  gap: var(--space-6);
}

.two-column-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 340px;
  gap: var(--space-6);
  align-items: start;
}

@media (max-width: 1080px) {
  .two-column-layout {
    grid-template-columns: minmax(0, 1fr);
  }
}

@media (max-width: 760px) {
  .app-header__inner {
    gap: var(--space-3);
    padding: 0 var(--space-4);
  }

  .brand__text,
  .app-header__meta {
    display: none;
  }

  .app-main {
    padding: var(--space-6) var(--space-4) var(--space-8);
  }

  .page-title {
    font-size: var(--font-size-xl);
  }
}