:root {
  --aite-canvas: #f4f6f3;
  --aite-surface: #ffffff;
  --aite-surface-muted: #f8faf8;
  --aite-ink: #17211f;
  --aite-muted: #64716d;
  --aite-line: #d8ded9;
  --aite-focus: #0f766e;
  --aite-focus-soft: #ddf1ed;
  --aite-shadow: 0 10px 28px rgba(24, 40, 35, 0.08);
  --aite-radius-card: 14px;
  --aite-radius-control: 10px;
}

html { background: var(--aite-canvas); }

body {
  background: var(--aite-canvas);
  color: var(--aite-ink);
}

.aite-brand {
  display: inline-flex;
  min-width: 0;
  align-items: center;
  gap: 10px;
  color: var(--aite-ink);
  font-weight: 900;
  text-decoration: none;
}

.aite-brand__mark {
  display: grid;
  width: 36px;
  height: 36px;
  flex: 0 0 36px;
  place-items: center;
  overflow: hidden;
  border-radius: 11px;
  background: #17332d;
  box-shadow: 0 5px 14px rgba(18, 48, 42, 0.16);
}

.aite-brand__mark img {
  display: block;
  width: 100%;
  height: 100%;
}

.aite-brand__wordmark { white-space: nowrap; }
.aite-brand__copy { min-width: 0; }

.aite-page-header {
  min-height: 68px;
  border-color: var(--aite-line);
  background: rgba(255, 255, 255, 0.96);
  box-shadow: 0 2px 12px rgba(24, 40, 35, 0.04);
}

.aite-page-nav a,
.aite-page-nav .primary-nav__item {
  border-radius: var(--aite-radius-control);
}

.intro-hero-card,
.intro-card,
.curriculum-card,
.lesson-section,
.exam-card,
.mock-sidebar__note,
.paper-card,
.workflow-panel,
.history-card,
.check-item,
.result-card,
.composite-source,
.composite-question,
.builder-question {
  border-color: var(--aite-line);
  border-radius: var(--aite-radius-card);
  box-shadow: var(--aite-shadow);
}

.intro-action,
.workflow-nav a,
.workflow-back,
.button,
.exam-card__action,
.primary-button,
.secondary-button,
.ghost-button,
.admissions-tab,
.tree-item,
.practice-choice,
.practice-choice__option,
.practice-choice__submit,
.practice-handwritten,
.module-choice,
.option-button,
.result-option,
.composite-option,
.builder-select,
.builder-actions input,
.builder-toggle__control,
.catalog-search,
.catalog-filter,
.search-box,
.invite-input {
  border-radius: var(--aite-radius-control);
}

.option-button,
.practice-choice__option,
.result-option,
.composite-option,
.module-choice {
  border-color: #bec8c1;
  background: var(--aite-surface);
}

.builder-select,
.builder-actions input,
.builder-toggle__control,
.catalog-search,
.catalog-filter,
.search-box,
.invite-input {
  border-color: #b9c4bd;
  background: var(--aite-surface);
}

.aite-brand:focus-visible,
button:focus-visible,
a:focus-visible,
input:focus-visible,
select:focus-visible,
summary:focus-visible {
  outline: 3px solid color-mix(in srgb, var(--aite-focus) 32%, transparent);
  outline-offset: 2px;
}

@media (max-width: 520px) {
  .aite-brand__mark {
    width: 32px;
    height: 32px;
    flex-basis: 32px;
    border-radius: 10px;
  }
}