client/src/components/Layout/Header.css

/* Header styles */

.app-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
  padding: 16px 24px;
  background-color: var(--color-primary);
  color: var(--color-white);
  box-shadow: 0 2px 8px var(--color-shadow);
  flex-shrink: 0;
}

.app-header__brand {
  display: flex;
  align-items: center;
  gap: 14px;
}

.app-header__logo {
  width: 52px;
  height: 52px;
  border-radius: 50%;
  background-color: var(--color-white);
  color: var(--color-primary);
  font-size: 16px;
  font-weight: 900;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  letter-spacing: 0.5px;
}

.app-header__title {
  font-size: 26px;
  font-weight: 800;
  color: var(--color-white);
  margin: 0;
  line-height: 1.2;
}

.app-header__subtitle {
  font-size: 16px;
  color: rgba(255, 255, 255, 0.85);
  margin: 0;
  line-height: 1.3;
}

.app-header__user {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 2px;
}

.app-header__user-greeting {
  font-size: 18px;
  color: var(--color-white);
}

.app-header__user-os {
  font-size: 15px;
  color: rgba(255, 255, 255, 0.75);
  background-color: rgba(255, 255, 255, 0.15);
  border-radius: var(--radius-full);
  padding: 2px 10px;
}

@media (max-width: 480px) {
  .app-header {
    padding: 12px 16px;
  }

  .app-header__title {
    font-size: 22px;
  }
}