/* Tool grid on homepage/tools index, and calculator page layout */

.tool-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-5);
}

@media (max-width: 900px) {
  .tool-grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 600px) {
  .tool-grid { grid-template-columns: 1fr; }
}

.tool-card {
  display: flex;
  flex-direction: column;
  height: 100%;
  transition: border-color 150ms ease, box-shadow 150ms ease;
}

.tool-card:hover {
  border-color: var(--color-primary);
  box-shadow: var(--shadow-md);
}

.tool-card__thumb-link {
  display: block;
  margin: calc(-1 * var(--space-5)) calc(-1 * var(--space-5)) var(--space-4);
  border-bottom: 1px solid var(--color-border);
  overflow: hidden;
  border-radius: var(--radius-md) var(--radius-md) 0 0;
  background: var(--color-surface-alt);
}

.tool-card__thumb {
  width: 100%;
  height: 170px;
  object-fit: cover;
  display: block;
}

.tool-card__icon {
  width: 28px;
  height: 28px;
  margin-bottom: var(--space-3);
  color: var(--color-primary);
}

.tool-card h3 {
  font-size: var(--text-lg);
  margin-bottom: var(--space-2);
}

.tool-card p {
  color: var(--color-text-muted);
  font-size: var(--text-sm);
  flex-grow: 1;
}

.tool-card .btn { margin-top: var(--space-4); align-self: flex-start; }

/* Calculator page layout: form + explanation */
.calculator-layout {
  display: grid;
  grid-template-columns: minmax(0, 420px) 1fr;
  gap: var(--space-7);
  align-items: start;
}

@media (max-width: 860px) {
  .calculator-layout { grid-template-columns: 1fr; }
}

.tool-intro {
  color: var(--color-text-muted);
  font-size: var(--text-lg);
  max-width: 62ch;
}

.related-tools {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-4);
}
@media (max-width: 700px) {
  .related-tools { grid-template-columns: 1fr; }
}
.related-tools a {
  display: block;
  padding: var(--space-4);
  border: var(--border-width) solid var(--color-border);
  border-radius: var(--radius-md);
  text-decoration: none;
  color: var(--color-text);
  font-weight: 600;
  font-size: var(--text-sm);
  background: var(--color-surface);
}
.related-tools a:hover { border-color: var(--color-primary); color: var(--color-primary); }

.formula-block {
  background: var(--color-surface);
  border: var(--border-width) solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-4);
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: var(--text-sm);
  overflow-x: auto;
  white-space: pre-wrap;
  line-height: 1.55;
}

/* --- Carousel (homepage article highlights) -------------------------- */
.carousel {
  position: relative;
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.carousel__viewport {
  flex: 1 1 auto;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  scrollbar-width: none;
  -ms-overflow-style: none;
  -webkit-overflow-scrolling: touch;
}
.carousel__viewport::-webkit-scrollbar { display: none; }

.carousel__track {
  display: flex;
  gap: var(--space-4);
}

.carousel__item {
  flex: 0 0 calc((100% - 3 * var(--space-4)) / 4);
  scroll-snap-align: start;
  text-decoration: none;
  color: var(--color-text);
  border: var(--border-width) solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  background: var(--color-surface);
  display: block;
}

.carousel__item:hover { border-color: var(--color-primary); }

.carousel__image {
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  display: block;
  background: var(--color-surface-alt);
}

.carousel__placeholder {
  width: 100%;
  aspect-ratio: 1 / 1;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-surface-alt);
  color: var(--color-border-strong);
}
.carousel__placeholder svg { width: 40px; height: 40px; }

.carousel__title {
  padding: var(--space-3);
  font-size: var(--text-sm);
  font-weight: 600;
  line-height: var(--leading-tight);
}

.carousel__arrow {
  flex: 0 0 auto;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  border: var(--border-width) solid var(--color-border-strong);
  background: var(--color-surface);
  color: var(--color-text);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
}
.carousel__arrow:hover { border-color: var(--color-primary); color: var(--color-primary); }
.carousel__arrow:disabled { opacity: 0.35; cursor: default; }
.carousel__arrow:disabled:hover { border-color: var(--color-border-strong); color: var(--color-text); }
.carousel__arrow svg { width: 18px; height: 18px; }

@media (max-width: 900px) {
  .carousel__item { flex-basis: calc((100% - 2 * var(--space-4)) / 3); }
}

@media (max-width: 620px) {
  .carousel__item { flex-basis: calc((100% - 1 * var(--space-4)) / 2); }
  .carousel__arrow { width: 34px; height: 34px; }
}