.page-shell {
  min-height: 100vh;
  padding: 24px 16px;
}

.app-card {
  max-width: 880px;
  margin: 0 auto;
  padding: 28px;
  border-radius: var(--radius-lg);
  background: var(--color-surface);
  box-shadow: var(--shadow-card);
}

.app-header {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  align-items: flex-start;
  margin-bottom: 24px;
}

.header-actions {
  display: flex;
  gap: 10px;
  align-items: center;
  flex-wrap: wrap;
  justify-content: flex-end;
}

.eyebrow {
  margin: 0 0 6px;
  font-size: 0.82rem;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

h1 {
  margin: 0;
  font-size: 2rem;
  line-height: 1.1;
}

.subtitle {
  margin: 10px 0 0;
  color: var(--color-text-muted);
  max-width: 60ch;
}

/* UI-A4: 700 → 768 (Mobile) */
@media (max-width: 768px) {
  .app-card {
    padding: 18px;
  }

  .app-header {
    flex-direction: column;
  }

  .header-actions {
    width: 100%;
    justify-content: space-between;
  }
}