/* Hero */
.hero {
  background-color: var(--color-white);
  background-image: radial-gradient(circle, #CBD5E1 1px, transparent 1px);
  background-size: 24px 24px;
  padding: var(--space-4xl) 0 var(--space-3xl);
  text-align: center;
}
.hero__inner {
  max-width: 720px;
  margin: 0 auto;
  padding: 0 var(--space-lg);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-lg);
}
.hero__title {
  font-size: clamp(2rem, 5vw, 3.25rem);
  font-weight: 800;
  letter-spacing: -.04em;
  line-height: 1.1;
  color: var(--color-dark);
}
.hero__subtitle {
  font-size: 1.1rem;
  color: var(--color-muted);
  max-width: 480px;
}

/* Hero search */
.hero__search { width: 100%; max-width: 560px; }
.hero-search-wrap {
  position: relative;
  display: flex;
  align-items: center;
  background: var(--color-white);
  border: 2px solid var(--color-border);
  border-radius: var(--radius-full);
  padding: 6px 6px 6px 20px;
  gap: var(--space-sm);
  box-shadow: var(--shadow-md);
  transition: border-color var(--dur), box-shadow var(--dur);
}
.hero-search-wrap:focus-within {
  border-color: var(--color-primary);
  box-shadow: 0 0 0 4px rgba(79,70,229,.1), var(--shadow-md);
}
.hero-search-wrap svg { color: var(--color-muted); flex-shrink: 0; }
.hero-search__input {
  flex: 1;
  border: none;
  outline: none;
  font-family: var(--font-body);
  font-size: 1rem;
  color: var(--color-dark);
  background: transparent;
  min-width: 0;
}
.hero-search__input::placeholder { color: var(--color-muted); }
.hero-search__btn {
  flex-shrink: 0;
  height: 40px;
  padding: 0 var(--space-lg);
  background: var(--color-primary);
  color: #fff;
  border-radius: var(--radius-full);
  font-family: var(--font-body);
  font-weight: 600;
  font-size: .9rem;
  transition: background var(--dur);
}
.hero-search__btn:hover { background: var(--color-primary-h); }
.hero-search__results {
  position: absolute;
  top: calc(100% + 8px);
  left: 0; right: 0;
}

/* Hero tags */
.hero__tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
  justify-content: center;
}
.hero-tag {
  padding: 6px 14px;
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-full);
  font-size: .82rem;
  font-weight: 500;
  color: var(--color-muted);
  background: var(--color-white);
  transition: border-color var(--dur), color var(--dur), background var(--dur);
}
.hero-tag:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
  background: #EEF2FF;
}

/* Categories section */
.categories-section {
  padding: var(--space-3xl) 0;
  background: var(--color-bg);
}
.section-title {
  font-size: 1.5rem;
  font-weight: 800;
  letter-spacing: -.02em;
  margin-bottom: var(--space-xl);
}
.categories-grid {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: var(--space-md);
}

.category-card {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
  padding: var(--space-lg);
  background: var(--color-white);
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-lg);
  transition: box-shadow var(--dur) var(--ease), border-color var(--dur), transform var(--dur) var(--ease);
  position: relative;
  overflow: hidden;
}
.category-card:hover {
  box-shadow: var(--shadow-card-hover);
  transform: translateY(-3px);
}

.category-card__icon {
  width: 52px; height: 52px;
  border-radius: var(--radius-md);
  display: flex; align-items: center; justify-content: center;
}
.category-card--calculators .category-card__icon { background: var(--cat-calc-bg); color: var(--cat-calc-icon); }
.category-card--calculators:hover                { border-color: var(--cat-calc-icon); }
.category-card--ai .category-card__icon          { background: var(--cat-ai-bg);   color: var(--cat-ai-icon); }
.category-card--ai:hover                         { border-color: var(--cat-ai-icon); }
.category-card--pdf .category-card__icon         { background: var(--cat-pdf-bg);  color: var(--cat-pdf-icon); }
.category-card--pdf:hover                        { border-color: var(--cat-pdf-icon); }
.category-card--file .category-card__icon        { background: var(--cat-file-bg); color: var(--cat-file-icon); }
.category-card--file:hover                       { border-color: var(--cat-file-icon); }
.category-card--converters .category-card__icon  { background: var(--cat-conv-bg); color: var(--cat-conv-icon); }
.category-card--converters:hover                 { border-color: var(--cat-conv-icon); }

.category-card__name {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: .975rem;
  color: var(--color-dark);
}
.category-card__desc {
  font-size: .8rem;
  color: var(--color-muted);
  line-height: 1.5;
}
.category-card__count {
  margin-top: auto;
  font-size: .78rem;
  font-weight: 600;
  color: var(--color-muted);
}

@media (max-width: 1024px) {
  .categories-grid { grid-template-columns: repeat(3, 1fr); }
  .category-card:nth-child(4),
  .category-card:nth-child(5) { grid-column: span 1; }
}
@media (max-width: 640px) {
  .categories-grid { grid-template-columns: repeat(2, 1fr); }
  .hero__title { font-size: 1.75rem; }
}
@media (max-width: 400px) {
  .categories-grid { grid-template-columns: 1fr; }
}