/* ============================================================
   C&S AIR PRODUCTS — PRODUCT CATEGORIES OVERVIEW
   Extends styles.css. Reuses the design tokens (colors, type,
   spacing, radii) defined in :root there.

   Mobile-first: unqueried rules below are the small-screen
   (< 768px) styles. min-width media queries layer up:
     @media (min-width: 640px)  → tablet and up
     @media (min-width: 1200px) → desktop only
   ============================================================ */

/* ---------- Page header ---------- */
.categories-header { padding: 32px 0 8px; }
.categories-header__eyebrow {
  font-family: var(--font-display);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: .12em;
  text-transform: uppercase;
  color: var(--color-teal);
  margin-bottom: 10px;
}
.categories-header h1 {
  font-family: var(--font-display);
  font-size: clamp(30px, 3.4vw, 42px);
  font-weight: 800;
  color: var(--color-text);
  letter-spacing: -.01em;
  margin-bottom: 14px;
}
.categories-header__accent {
  width: 60px;
  height: 4px;
  background: var(--color-teal);
  border-radius: 2px;
  margin-bottom: 16px;
}
.categories-header__intro {
  max-width: 640px;
  font-size: 17px;
  color: var(--color-text-light);
}

/* ---------- Category grid ---------- */
.category-grid { padding: 28px 0 56px; }
.category-grid__inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
}

.category-card {
  display: flex;
  flex-direction: column;
  background: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: box-shadow var(--transition), border-color var(--transition);
}
.category-card:hover {
  box-shadow: var(--shadow-md);
  border-color: var(--color-teal);
}

.category-card__image {
  display: block;
  aspect-ratio: 4 / 3;
  background: var(--color-off-white);
}
.category-card__image img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  padding: 20px;
}

.category-card__body {
  display: flex;
  flex-direction: column;
  flex: 1;
  justify-content: flex-start;
  padding: 22px 22px 24px;
}

.category-card__title {
  font-family: var(--font-display);
  font-size: 22px;
  font-weight: 800;
  color: var(--color-text);
  letter-spacing: -.01em;
  margin-bottom: 4px;
}
.category-card__title a { text-decoration: none; color: inherit; }
.category-card__title a:hover { color: var(--color-teal); }

.category-card__tagline {
  font-family: var(--font-display);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: .04em;
  text-transform: uppercase;
  color: var(--color-teal);
  margin-bottom: 10px;
}

.category-card__copy {
  font-size: 15px;
  color: var(--color-text-light);
  margin-bottom: 18px;
}

.category-card__subcats {
  margin-top: 16px;
  border-top: 1px solid var(--color-border);
  padding-top: 16px;
}
.category-card__subcats-label {
  font-family: var(--font-display);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--color-mid-gray);
  margin-bottom: 8px;
}

.category-card__no-subcats {
  font-size: 13px;
  color: var(--color-mid-gray);
  font-style: italic;
}

/* Recursive subcategory tree */
.subcat-list,
.subcat-list ul {
  list-style: none;
}
.subcat-list ul {
  margin-left: 14px;
  margin-top: 4px;
}
.subcat-list li { margin-top: 4px; }
.subcat-list a {
  font-size: 14px;
  color: var(--color-text);
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}
.subcat-list a::before {
  content: '';
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: var(--color-teal);
  flex-shrink: 0;
}
.subcat-list a:hover { color: var(--color-teal); text-decoration: underline; }

.category-card__cta { margin-top: 18px; align-self: flex-start; }

/* ---------- Responsive ---------- */
@media (min-width: 640px) {
  .category-grid__inner { grid-template-columns: repeat(2, 1fr); }
}
@media (min-width: 1200px) {
  .category-grid { padding: 40px 0 72px; }
}