/*
  Section Header component
  
  Structure:
  .a-section-header              - Base section header container
  .a-section-header-bar        - Top bar containing title and actions
  .a-section-header-leading  - Leading content area (expand button, avatar, etc.)
  .a-section-header-expand - Expand/collapse button
  .a-section-header-titles - Title and subtitle container
  .a-section-header-title - Main title (h2, h3, or h4)
  .a-section-header-subtitle - Subtitle text
  .a-section-header-trailing - Trailing content area (status, actions, button array)
  .a-section-header-content   - Content below header (toolbar, children)
  
  Heading levels:
  .a-section-header--h3          - H3 level (medium)
  .a-section-header--h4          - H4 level (smallest)
  (no modifier = h2, largest, default)
  
  States:
  .a-section-header--expandable  - Has expand/collapse functionality
  .a-section-header--expanded    - Content is visible (when expandable)
*/

.a-section-header {
  --container-gap: var(--lens-semantic-spacing-desktop-gap-3);
  --title-font-size: var(
    --a-section-header-title-font-size,
    var(--lens-semantic-font-title-h4-md-font-size)
  );
  --title-line-height: var(
    --a-section-header-title-line-height,
    var(--lens-semantic-font-title-h4-md-line-height)
  );
  --title-letter-spacing: var(
    --a-section-header-title-letter-spacing,
    var(--lens-semantic-font-title-h4-md-letter-spacing)
  );
  --subtitle-font-size: var(
    --a-section-header-subtitle-font-size,
    var(--lens-semantic-font-title-h6-xxs-font-size)
  );
  --subtitle-line-height: var(
    --a-section-header-subtitle-line-height,
    var(--lens-semantic-font-title-h6-xxs-line-height)
  );
  --subtitle-letter-spacing: var(
    --a-section-header-subtitle-letter-spacing,
    var(--lens-semantic-font-title-h6-xxs-letter-spacing)
  );
  display: flex;
  flex-direction: column;
  gap: var(--a-section-header-container-gap, var(--container-gap));
}

.a-section-header.a-section-header--h3 {
  --title-font-size: var(
    --a-section-header-title-font-size,
    var(--lens-semantic-font-title-h5-sm-font-size)
  );
  --title-line-height: var(
    --a-section-header-title-line-height,
    var(--lens-semantic-font-title-h5-sm-line-height)
  );
  --title-letter-spacing: var(
    --a-section-header-title-letter-spacing,
    var(--lens-semantic-font-title-h5-sm-letter-spacing)
  );
  --subtitle-font-size: var(
    --a-section-header-subtitle-font-size,
    var(--lens-semantic-font-title-h6-xxs-font-size)
  );
  --subtitle-line-height: var(
    --a-section-header-subtitle-line-height,
    var(--lens-semantic-font-title-h6-xxs-line-height)
  );
  --subtitle-letter-spacing: var(
    --a-section-header-subtitle-letter-spacing,
    var(--lens-semantic-font-title-h6-xxs-letter-spacing)
  );
}

.a-section-header.a-section-header--h4 {
  --title-font-size: var(
    --a-section-header-title-font-size,
    var(--lens-semantic-font-title-h6-xs-font-size)
  );
  --title-line-height: var(
    --a-section-header-title-line-height,
    var(--lens-semantic-font-title-h6-xs-line-height)
  );
  --title-letter-spacing: var(
    --a-section-header-title-letter-spacing,
    var(--lens-semantic-font-title-h6-xs-letter-spacing)
  );
  --subtitle-font-size: var(
    --a-section-header-subtitle-font-size,
    var(--lens-semantic-font-title-h6-xxs-font-size)
  );
  --subtitle-line-height: var(
    --a-section-header-subtitle-line-height,
    var(--lens-semantic-font-title-h6-xxs-line-height)
  );
  --subtitle-letter-spacing: var(
    --a-section-header-subtitle-letter-spacing,
    var(--lens-semantic-font-title-h6-xxs-letter-spacing)
  );
}

@media (min-width: 481px) {
  .a-section-header {
    --title-font-size: var(
      --a-section-header-title-font-size,
      var(--lens-semantic-font-title-h3-lg-font-size)
    );
    --title-line-height: var(
      --a-section-header-title-line-height,
      var(--lens-semantic-font-title-h3-lg-line-height)
    );
    --title-letter-spacing: var(
      --a-section-header-title-letter-spacing,
      var(--lens-semantic-font-title-h3-lg-letter-spacing)
    );
    --subtitle-font-size: var(
      --a-section-header-subtitle-font-size,
      var(--lens-semantic-font-title-h6-xxs-font-size)
    );
    --subtitle-line-height: var(
      --a-section-header-subtitle-line-height,
      var(--lens-semantic-font-title-h6-xxs-line-height)
    );
    --subtitle-letter-spacing: var(
      --a-section-header-subtitle-letter-spacing,
      var(--lens-semantic-font-title-h6-xxs-letter-spacing)
    );
  }
  .a-section-header.a-section-header--h3 {
    --title-font-size: var(
      --a-section-header-title-font-size,
      var(--lens-semantic-font-title-h4-md-font-size)
    );
    --title-line-height: var(
      --a-section-header-title-line-height,
      var(--lens-semantic-font-title-h4-md-line-height)
    );
    --title-letter-spacing: var(
      --a-section-header-title-letter-spacing,
      var(--lens-semantic-font-title-h4-md-letter-spacing)
    );
    --subtitle-font-size: var(
      --a-section-header-subtitle-font-size,
      var(--lens-semantic-font-title-h6-xxs-font-size)
    );
    --subtitle-line-height: var(
      --a-section-header-subtitle-line-height,
      var(--lens-semantic-font-title-h6-xxs-line-height)
    );
    --subtitle-letter-spacing: var(
      --a-section-header-subtitle-letter-spacing,
      var(--lens-semantic-font-title-h6-xxs-letter-spacing)
    );
  }
  .a-section-header.a-section-header--h4 {
    --title-font-size: var(
      --a-section-header-title-font-size,
      var(--lens-semantic-font-title-h5-sm-font-size)
    );
    --title-line-height: var(
      --a-section-header-title-line-height,
      var(--lens-semantic-font-title-h5-sm-line-height)
    );
    --title-letter-spacing: var(
      --a-section-header-title-letter-spacing,
      var(--lens-semantic-font-title-h5-sm-letter-spacing)
    );
    --subtitle-font-size: var(
      --a-section-header-subtitle-font-size,
      var(--lens-semantic-font-title-h6-xxs-font-size)
    );
    --subtitle-line-height: var(
      --a-section-header-subtitle-line-height,
      var(--lens-semantic-font-title-h6-xxs-line-height)
    );
    --subtitle-letter-spacing: var(
      --a-section-header-subtitle-letter-spacing,
      var(--lens-semantic-font-title-h6-xxs-letter-spacing)
    );
  }
}

@media (min-width: 769px) {
  .a-section-header {
    --title-font-size: var(
      --a-section-header-title-font-size,
      var(--lens-semantic-font-title-h2-display-font-size)
    );
    --title-line-height: var(
      --a-section-header-title-line-height,
      var(--lens-semantic-font-title-h2-display-line-height)
    );
    --title-letter-spacing: var(
      --a-section-header-title-letter-spacing,
      var(--lens-semantic-font-title-h2-display-letter-spacing)
    );
    --subtitle-font-size: var(
      --a-section-header-subtitle-font-size,
      var(--lens-semantic-font-title-h5-sm-font-size)
    );
    --subtitle-line-height: var(
      --a-section-header-subtitle-line-height,
      var(--lens-semantic-font-title-h5-sm-line-height)
    );
    --subtitle-letter-spacing: var(
      --a-section-header-subtitle-letter-spacing,
      var(--lens-semantic-font-title-h5-sm-letter-spacing)
    );
  }
  .a-section-header.a-section-header--h3 {
    --title-font-size: var(
      --a-section-header-title-font-size,
      var(--lens-semantic-font-title-h3-lg-font-size)
    );
    --title-line-height: var(
      --a-section-header-title-line-height,
      var(--lens-semantic-font-title-h3-lg-line-height)
    );
    --title-letter-spacing: var(
      --a-section-header-title-letter-spacing,
      var(--lens-semantic-font-title-h3-lg-letter-spacing)
    );
    --subtitle-font-size: var(
      --a-section-header-subtitle-font-size,
      var(--lens-semantic-font-title-h6-xxs-font-size)
    );
    --subtitle-line-height: var(
      --a-section-header-subtitle-line-height,
      var(--lens-semantic-font-title-h6-xxs-line-height)
    );
    --subtitle-letter-spacing: var(
      --a-section-header-subtitle-letter-spacing,
      var(--lens-semantic-font-title-h6-xxs-letter-spacing)
    );
  }
  .a-section-header.a-section-header--h4 {
    --title-font-size: var(
      --a-section-header-title-font-size,
      var(--lens-semantic-font-title-h4-md-font-size)
    );
    --title-line-height: var(
      --a-section-header-title-line-height,
      var(--lens-semantic-font-title-h4-md-line-height)
    );
    --title-letter-spacing: var(
      --a-section-header-title-letter-spacing,
      var(--lens-semantic-font-title-h4-md-letter-spacing)
    );
    --subtitle-font-size: var(
      --a-section-header-subtitle-font-size,
      var(--lens-semantic-font-title-h6-xxs-font-size)
    );
    --subtitle-line-height: var(
      --a-section-header-subtitle-line-height,
      var(--lens-semantic-font-title-h6-xxs-line-height)
    );
    --subtitle-letter-spacing: var(
      --a-section-header-subtitle-letter-spacing,
      var(--lens-semantic-font-title-h6-xxs-letter-spacing)
    );
  }
}

.a-section-header-bar {
  --gap: var(--a-section-header-bar-gap, var(--lens-semantic-spacing-desktop-gap-3));
  display: flex;
  flex-direction: row;
  align-items: flex-start;
  justify-content: space-between;
  gap: var(--gap);
}

.a-section-header-leading {
  --gap: var(--a-section-header-leading-gap, var(--lens-semantic-spacing-desktop-gap-1));
  display: flex;
  flex-direction: row;
  align-items: flex-start;
  gap: var(--gap);
  & > .a-avatar,
  & > .a-btn {
    flex-shrink: 0;
  }
}

.a-section-header-titles {
  --gap: var(--a-section-header-titles-gap, var(--lens-semantic-spacing-desktop-gap-0-5));
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: var(--gap);
}

:is(h2, h3, h4).a-section-header-title {
  margin: 0;
  font-size: var(--title-font-size);
  line-height: var(--title-line-height);
  letter-spacing: var(--title-letter-spacing);
  font-weight: var(--lens-semantic-font-weight-emphasis);
  color: var(--lens-semantic-color-type-default);
}

p.a-section-header-subtitle {
  margin: 0;
  font-size: var(--subtitle-font-size);
  line-height: var(--subtitle-line-height);
  letter-spacing: var(--subtitle-letter-spacing);
  font-weight: var(--lens-semantic-font-weight-regular);
  color: var(--lens-semantic-color-type-muted);
}

.a-section-header-trailing {
  --gap: var(--a-section-header-trailing-gap, var(--lens-semantic-spacing-desktop-gap-2));
  display: flex;
  flex-direction: row;
  align-items: center;
  gap: var(--gap);
}

.a-section-header-expand svg {
  transition: transform var(--a-transition-duration) var(--a-transition-easing);
}

.a-section-header.a-section-header--expanded .a-section-header-expand svg {
  transform: rotate(90deg);
}

.a-section-header-content {
  --gap: var(--a-section-header-content-gap, var(--lens-semantic-spacing-desktop-gap-3));
  display: flex;
  flex-direction: column;
  gap: var(--gap);
}

.a-section-header.a-section-header--expandable:not(.a-section-header--expanded)
  .a-section-header-content {
  display: none;
}