/*
 * Shared trainer foundation primitives.
 *
 * This layer is intentionally limited to page geometry, surfaces, layout flow,
 * typography, and an underlined text link. Button, Input, Choice, PlayingCard,
 * feedback components, and motion do not belong here yet.
 */

:where(.ds-page, .ds-page *, .ds-page *::before, .ds-page *::after) {
  box-sizing: border-box;
}

.ds-page {
  min-block-size: 100vh;
  margin: 0;
  padding: var(--ds-spacing-shell) var(--ds-spacing-section)
    calc(var(--ds-spacing-page) * 2);
  background: var(--ds-color-canvas);
  color: var(--ds-color-text-primary);
  font-family: var(--ds-font-family-sans);
  font-size: var(--ds-font-size-body);
  line-height: var(--ds-font-line-height-body);
  -webkit-font-smoothing: antialiased;
}

.ds-page [hidden] {
  display: none !important;
}

.ds-page-shell {
  width: 100%;
  max-width: var(--ds-layout-width-standard);
  margin-inline: auto;
}

.ds-page-shell--editorial {
  max-width: var(--ds-layout-width-editorial);
}

.ds-page-shell--standard {
  max-width: var(--ds-layout-width-standard);
}

.ds-page-shell--complex {
  max-width: var(--ds-layout-width-complex);
}

.ds-surface {
  border: 1px solid var(--ds-color-border-default);
  background: var(--ds-color-surface-primary);
  color: var(--ds-color-text-primary);
}

.ds-surface--shell {
  padding: var(--ds-spacing-shell);
  border-radius: var(--ds-radius-shell);
  box-shadow: var(--ds-shadow-surface);
}

.ds-surface--task {
  padding: var(--ds-spacing-section);
  border-radius: var(--ds-radius-task);
  box-shadow: var(--ds-shadow-surface);
}

.ds-surface--nested {
  padding: var(--ds-spacing-group);
  border-radius: var(--ds-radius-task);
  background: var(--ds-color-surface-secondary);
}

.ds-stack,
.ds-cluster {
  --_ds-flow-gap: var(--ds-spacing-group);
}

.ds-stack {
  display: grid;
  gap: var(--_ds-flow-gap);
}

.ds-cluster {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--_ds-flow-gap);
}

.ds-gap--tight {
  --_ds-flow-gap: var(--ds-spacing-tight);
}

.ds-gap--inline {
  --_ds-flow-gap: var(--ds-spacing-inline);
}

.ds-gap--control {
  --_ds-flow-gap: var(--ds-spacing-control);
}

.ds-gap--group {
  --_ds-flow-gap: var(--ds-spacing-group);
}

.ds-gap--section {
  --_ds-flow-gap: var(--ds-spacing-section);
}

.ds-gap--shell {
  --_ds-flow-gap: var(--ds-spacing-shell);
}

.ds-gap--page {
  --_ds-flow-gap: var(--ds-spacing-page);
}

.ds-page-title,
.ds-question,
.ds-body,
.ds-ui,
.ds-metadata {
  margin-block: 0;
}

.ds-page-title {
  font-size: var(--ds-font-size-page-title);
  font-weight: 800;
  line-height: var(--ds-font-line-height-page-title);
  letter-spacing: -.02em;
}

.ds-question {
  font-size: var(--ds-font-size-question);
  font-weight: 800;
  line-height: var(--ds-font-line-height-question);
  letter-spacing: -.01em;
}

.ds-body {
  font-size: var(--ds-font-size-body);
  line-height: var(--ds-font-line-height-body);
}

.ds-ui {
  font-size: var(--ds-font-size-ui);
  font-weight: 600;
  line-height: var(--ds-font-line-height-ui);
}

.ds-metadata {
  font-family: var(--ds-font-family-mono);
  font-size: var(--ds-font-size-metadata);
  font-weight: 800;
  line-height: var(--ds-font-line-height-metadata);
  letter-spacing: .06em;
  text-transform: uppercase;
}

.ds-text-muted {
  color: var(--ds-color-text-muted);
}

.ds-text-link {
  color: var(--ds-color-action-accent);
  text-decoration-line: underline;
  text-decoration-thickness: .08em;
  text-underline-offset: .18em;
}

.ds-text-link:hover {
  text-decoration-thickness: .14em;
}

.ds-text-link:focus-visible {
  border-radius: var(--ds-radius-field);
  outline: 3px solid var(--ds-color-action-accent);
  outline-offset: var(--ds-spacing-tight);
}

@media (max-width: 650px) {
  .ds-page {
    padding: var(--ds-spacing-group) var(--ds-spacing-control)
      var(--ds-spacing-page);
  }

  .ds-surface--shell {
    padding: var(--ds-spacing-group);
  }

  .ds-surface--task {
    padding: var(--ds-spacing-control);
  }
}