/* Calculator directory */
.calc-index {
  background:
    radial-gradient(900px 460px at 100% -10%, color-mix(in oklab, var(--bs-primary) 16%, transparent), transparent 62%);
}

.calculator-hero {
  padding: 2.2rem 0 1.4rem;
  border-bottom: 1px solid var(--bs-border-color);
}

.calculator-hero-inner {
  display: grid;
  gap: 1.25rem;
  align-items: end;
}

.calculator-hero-copy {
  max-width: 820px;
}

.section-kicker {
  margin: 0 0 .35rem;
  color: #0f766e;
  font-size: .78rem;
  font-weight: 800;
  letter-spacing: .06em;
  text-transform: uppercase;
}

.calculator-hero h1,
.section-head h2 {
  margin: 0;
  color: var(--bs-heading);
  line-height: 1.12;
}

.calculator-hero h1 {
  max-width: 760px;
  font-size: clamp(2rem, 4vw, 3.5rem);
}

.page-sub {
  max-width: 760px;
  margin: .75rem 0 0;
  color: var(--bs-muted);
  font-size: 1.05rem;
}

.calculator-search {
  display: grid;
  grid-template-columns: 1fr;
  gap: .5rem;
  width: min(100%, 780px);
  margin-top: 1.1rem;
  padding: .4rem;
  border: 1px solid var(--bs-border-color);
  border-radius: .5rem;
  background: var(--bs-surface);
  box-shadow: var(--shadow-sm);
}

.calculator-search:focus-within {
  border-color: var(--bs-primary);
  box-shadow: 0 0 0 3px rgba(14, 165, 233, .16), var(--shadow-sm);
}

.calculator-search input[type="search"] {
  min-width: 0;
  border: 0;
  background: transparent;
  color: var(--bs-body-color);
  padding: .65rem .7rem;
  font: inherit;
}

.calculator-search input[type="search"]:focus {
  outline: none;
}

.calculator-search .btn {
  text-align: center;
}

.filter-status {
  min-height: 1.4rem;
  margin: .45rem 0 0;
  color: var(--bs-muted);
  font-size: .9rem;
}

.directory-stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: .65rem;
  margin: 0;
  padding: 0;
}

.directory-stats div {
  min-width: 0;
  padding: .85rem;
  border: 1px solid var(--bs-border-color);
  border-radius: .5rem;
  background: color-mix(in oklab, var(--bs-surface) 88%, transparent);
  box-shadow: var(--shadow-sm);
  text-align: center;
}

.directory-stats dt {
  margin: 0;
  color: var(--bs-heading);
  font-size: 1.45rem;
  font-weight: 800;
  line-height: 1;
}

.directory-stats dd {
  margin: .25rem 0 0;
  color: var(--bs-muted);
  font-size: .85rem;
  line-height: 1.25;
}

.chooser,
.subjects,
.subject-guides {
  padding: 2rem 0;
}

.section-head {
  max-width: 760px;
  margin-bottom: 1rem;
}

.section-head h2 {
  font-size: clamp(1.45rem, 2.4vw, 2rem);
}

.chooser-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
}

.chooser-card {
  display: grid;
  gap: .45rem;
  min-height: 142px;
  align-content: start;
  padding: 1rem;
  border: 1px solid var(--bs-border-color);
  border-radius: .5rem;
  background:
    linear-gradient(135deg, color-mix(in oklab, var(--bs-surface) 92%, #ecfccb), var(--bs-surface));
  color: var(--bs-body-color);
  text-decoration: none;
  box-shadow: var(--shadow-sm);
  transition: transform .15s ease, border-color .15s ease, box-shadow .15s ease;
}

.chooser-card:nth-child(2) {
  background:
    linear-gradient(135deg, color-mix(in oklab, var(--bs-surface) 92%, #dbeafe), var(--bs-surface));
}

.chooser-card:nth-child(3) {
  background:
    linear-gradient(135deg, color-mix(in oklab, var(--bs-surface) 92%, #fef3c7), var(--bs-surface));
}

.chooser-card:nth-child(4) {
  background:
    linear-gradient(135deg, color-mix(in oklab, var(--bs-surface) 92%, #fce7f3), var(--bs-surface));
}

.chooser-card:hover,
.subject-card:hover {
  transform: translateY(-2px);
  border-color: color-mix(in oklab, var(--bs-primary) 55%, var(--bs-border-color));
  box-shadow: var(--shadow);
}

.chooser-card:focus-visible,
.subject-main-link:focus-visible,
.chapter-links a:focus-visible {
  outline: 2px solid var(--bs-primary);
  outline-offset: 2px;
}

.chooser-card span {
  color: #92400e;
  font-size: .78rem;
  font-weight: 800;
  letter-spacing: .05em;
  text-transform: uppercase;
}

.chooser-card strong {
  color: var(--bs-heading);
  font-size: 1.05rem;
  line-height: 1.35;
}

.subjects-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
}

.subject-card {
  display: grid;
  align-content: start;
  border: 1px solid var(--bs-border-color);
  border-radius: .5rem;
  overflow: hidden;
  background: var(--bs-surface);
  box-shadow: var(--shadow-sm);
  transition: transform .15s ease, border-color .15s ease, box-shadow .15s ease;
}

.subject-card[hidden] {
  display: none;
}

.subject-main-link {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
  color: var(--bs-body-color);
  text-decoration: none;
}

.subject-image {
  display: block;
  width: 100%;
  aspect-ratio: 16 / 9;
  background: var(--bs-surface-2);
  overflow: hidden;
}

.subject-image img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.subject-body {
  display: grid;
  gap: .45rem;
  min-width: 0;
  padding: .85rem .9rem .95rem;
}

.subject-title {
  color: var(--bs-heading);
  font-size: 1.08rem;
  font-weight: 800;
  line-height: 1.2;
}

.subject-counts {
  color: var(--bs-muted);
  font-size: .9rem;
  line-height: 1.25;
}

.subject-summary {
  color: var(--bs-body-color);
  font-size: .92rem;
  line-height: 1.45;
}

.chapter-links {
  display: grid;
  gap: .35rem;
  padding: 0 .75rem .75rem;
}

.chapter-links a {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: .55rem;
  align-items: center;
  min-height: 38px;
  padding: .45rem .55rem;
  border: 1px solid var(--bs-border-color);
  border-radius: .45rem;
  background: var(--bs-surface-2);
  color: var(--bs-body-color);
  text-decoration: none;
}

.chapter-links a:hover {
  border-color: color-mix(in oklab, var(--bs-primary) 50%, var(--bs-border-color));
  background: color-mix(in oklab, var(--bs-surface-2) 78%, var(--bs-primary));
}

.chapter-links span {
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  font-size: .9rem;
}

.chapter-links small {
  color: var(--bs-muted);
  font-weight: 800;
}

.empty-state,
.no-subject-results {
  margin: 1rem 0 0;
  color: var(--bs-muted);
}

.guide-intro {
  margin: .55rem 0 0;
  color: var(--bs-muted);
  max-width: 72ch;
}

.subject-guide-list {
  display: grid;
  gap: 1rem;
}

.subject-guide {
  display: grid;
  gap: 1rem;
  padding: 1rem;
  border: 1px solid var(--bs-border-color);
  border-radius: .5rem;
  background: var(--bs-surface);
  box-shadow: var(--shadow-sm);
}

.subject-guide h3,
.subject-guide h4,
.subject-guide p {
  margin: 0;
}

.subject-guide h3 {
  font-size: 1.15rem;
  line-height: 1.25;
}

.subject-guide h3 a {
  color: var(--bs-heading);
  text-decoration: none;
}

.subject-guide h3 a:hover {
  text-decoration: underline;
}

.subject-guide p {
  margin-top: .45rem;
  color: var(--bs-body-color);
}

.subject-guide h4 {
  color: var(--bs-heading);
  font-size: .86rem;
  letter-spacing: .04em;
  text-transform: uppercase;
}

.best-for ul {
  margin: .45rem 0 0;
  padding-left: 1.15rem;
  color: var(--bs-body-color);
}

.best-for li + li {
  margin-top: .25rem;
}

.guide-chapters div {
  display: flex;
  flex-wrap: wrap;
  gap: .45rem;
  margin-top: .5rem;
}

.guide-chapters a {
  display: inline-flex;
  align-items: center;
  max-width: 100%;
  padding: .35rem .55rem;
  border: 1px solid var(--bs-border-color);
  border-radius: 999px;
  background: var(--bs-surface-2);
  color: var(--bs-body-color);
  font-size: .9rem;
  line-height: 1.2;
  text-decoration: none;
}

.guide-chapters a:hover {
  border-color: color-mix(in oklab, var(--bs-primary) 50%, var(--bs-border-color));
  background: color-mix(in oklab, var(--bs-surface-2) 78%, var(--bs-primary));
}

html[data-theme="dark"] .section-kicker,
html[data-theme="dark"] .chooser-card span {
  color: #5eead4;
}

html[data-theme="dark"] .subject-image {
  background: color-mix(in oklab, var(--bs-surface-2) 70%, var(--bs-primary));
}

@media (prefers-color-scheme: dark) {
  .section-kicker,
  .chooser-card span {
    color: #5eead4;
  }

  .subject-image {
    background: color-mix(in oklab, var(--bs-surface-2) 70%, var(--bs-primary));
  }
}

@media (min-width: 640px) {
  .calculator-search {
    grid-template-columns: minmax(0, 1fr) auto;
  }

  .subjects-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .calculator-hero-inner {
    grid-template-columns: 1fr;
  }

  .chooser-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .subject-guide {
    align-items: start;
  }
}

@media (min-width: 1180px) {
  .subjects-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (max-width: 520px) {
  .directory-stats {
    grid-template-columns: 1fr 1fr 1fr;
  }
}

@media (prefers-reduced-motion: reduce) {
  .chooser-card,
  .subject-card {
    transition: none;
  }
}