:root {
  --gutter: 1rem;
  --radius: 15px;
  --transition: 0.3s ease;
  --text-dark: #333;
  --bg-light: #f9f9f9;
  --btn-highlight: #ffde59;
  --btn-highlight-hover: orange;
  --font-stack: Poppins, sans-serif;
}

/* Reset & Base */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}
body {
  background-color: var(--bg-light);
  font-family: var(--font-stack);
  color: var(--text-dark);
}

/* Section wrapper */
#categories-section {
  width: 100%;
  max-width: 1200px;
  margin: clamp(1.5rem, 4vw, 3rem) auto 0;
  padding: clamp(0.5rem, 2vw, 1rem);
}

/* Header */
.flash-sale-header h2 {
  font-family: var(--font-stack);
  font-weight: 500;
  font-size: clamp(1.5rem, 4vw, 2rem);
  margin-bottom: clamp(1rem, 3vw, 2rem);
  text-align: center;
}

/* Responsive grid: auto-fit minmax */
.categories-grid {
  display: grid;
  gap: var(--gutter);
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  margin-bottom: clamp(1.5rem, 4vw, 3rem);
}

/* Category card */
.category-card {
  background: #fff;
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: 0 2px 5px rgba(0,0,0,0.1);
  transition: transform var(--transition), box-shadow var(--transition);
  text-align: center;
}
.category-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 4px 12px rgba(0,0,0,0.15);
}
.category-card.card-hidden {
  opacity: 0;
  transform: translateY(30px);
}
.category-card.card-visible {
  opacity: 1;
  transform: translateY(0);
  transition: opacity 0.6s, transform 0.6s;
}

.category-card a {
  display: block;
  padding: clamp(0.75rem, 2vw, 1rem);
  text-decoration: none;
  color: var(--text-dark);
}

/* Icon box */
.icon-box {
  width: clamp(3rem, 8vw, 5rem);
  height: clamp(3rem, 8vw, 5rem);
  margin: 0 auto clamp(0.5rem, 2vw, 1rem);
  border-radius: var(--radius);
  overflow: hidden;
}
.category-image {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition);
}
.category-card:hover .category-image {
  transform: scale(1.05);
}

/* Category name */
.category-name {
  font-size: clamp(0.875rem, 2vw, 1rem);
  font-family: var(--font-stack);
  margin: 0;
}

/* Load more */
.cat-load-more-container {
  text-align: center;
  margin-top: clamp(1rem, 3vw, 2rem);
}
.cat-load-more-btn {
  display: inline-block;
  background-color: var(--btn-bg);
  color: var(--btn-color);
  padding: clamp(0.5rem, 2vw, 0.75rem) clamp(1rem, 4vw, 1.5rem);
  font-size: clamp(0.9rem, 2.5vw, 1.1rem);
  font-weight: 400;
  border-radius: 25px;
  text-decoration: none;
  transition: background-color var(--transition), color var(--transition), transform var(--transition);
}
.cat-load-more-btn:hover,
.cat-load-more-btn:focus {
  background-color: var(--btn-color);
  color: var(--btn-bg);
  transform: translateY(-2px);
}