:root {
  --color-text: #1a1a1a;
  --color-muted: #555;
  --color-bg: #fafaf8;
  --color-surface: #fff;
  --color-border: #ddd;
  --color-accent: #1f4b7a;
  --color-link: #0b4f8a;
  --font-body: "Source Serif 4", "Georgia", "Times New Roman", serif;
  --font-ui: "Segoe UI", system-ui, sans-serif;
  --axis-climate_change: #2d6a4f;
  --axis-gender: #9b2226;
  --axis-caste: #7b2cbf;
  --axis-social_capital_marginalization: #bc6c25;
  --max-width: 960px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-body);
  font-size: 1.05rem;
  line-height: 1.65;
  color: var(--color-text);
  background: var(--color-bg);
}

a {
  color: var(--color-link);
}

a:hover {
  text-decoration: none;
}

.site-header {
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  z-index: 100;
}

.site-header__inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0.85rem 1.25rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
}

.site-title {
  font-family: var(--font-ui);
  font-size: 0.95rem;
  font-weight: 600;
  color: var(--color-accent);
  text-decoration: none;
}

.site-nav {
  display: flex;
  gap: 1.25rem;
  font-family: var(--font-ui);
  font-size: 0.95rem;
}

.site-nav a {
  text-decoration: none;
  color: var(--color-muted);
}

.site-nav a:hover,
.site-nav a[aria-current="page"] {
  color: var(--color-accent);
}

main {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 2rem 1.25rem 4rem;
}

.page-intro {
  font-family: var(--font-ui);
  color: var(--color-muted);
  margin-bottom: 2rem;
}

.error-banner {
  background: #fdecea;
  border: 1px solid #f5c2c0;
  color: #842029;
  padding: 1rem 1.25rem;
  border-radius: 6px;
  font-family: var(--font-ui);
  margin-bottom: 1.5rem;
}

.prose h1 {
  font-size: 2rem;
  line-height: 1.2;
  margin-top: 0;
}

.prose h2 {
  font-size: 1.45rem;
  margin-top: 2.25rem;
  border-bottom: 1px solid var(--color-border);
  padding-bottom: 0.35rem;
}

.prose h3 {
  font-size: 1.15rem;
  margin-top: 1.75rem;
}

.prose p,
.prose li {
  max-width: 72ch;
}

.prose strong {
  font-weight: 650;
}

.framework-summary {
  margin: 2rem 0 2.5rem;
  padding: 1.5rem 1.25rem;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 8px;
}

.framework-summary h3 {
  margin-top: 0;
  font-family: var(--font-ui);
  font-size: 1.1rem;
  color: var(--color-accent);
}

.framework-summary ol,
.framework-summary ul {
  padding-left: 1.25rem;
}

.framework-summary li {
  margin-bottom: 0.65rem;
}

.framework-summary .topic-name {
  font-weight: 650;
}

.framework-summary .areas-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 0.5rem 1rem;
  list-style: none;
  padding: 0;
}

.framework-summary .areas-grid a {
  text-decoration: none;
}

.framework-summary .areas-grid a:hover {
  text-decoration: underline;
}

.examples-filter {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.75rem 1.25rem;
  margin-bottom: 1.5rem;
  padding: 0.85rem 1rem;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 8px;
}

.examples-filter__label {
  font-family: var(--font-ui);
  font-weight: 650;
  color: var(--color-text-muted);
}

.examples-filter__option {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  cursor: pointer;
}

.examples-filter__label--sep {
  margin-left: 0.5rem;
  padding-left: 1.25rem;
  border-left: 1px solid var(--color-border);
}

.examples-empty {
  color: var(--color-text-muted);
  font-style: italic;
}

.examples-toc {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  padding: 1.25rem 1.5rem;
  margin-bottom: 2.5rem;
}

.examples-toc h2 {
  margin: 0 0 0.75rem;
  font-family: var(--font-ui);
  font-size: 1.1rem;
}

.examples-toc ul {
  columns: 2;
  column-gap: 2rem;
  padding-left: 1.1rem;
  margin: 0;
}

.area-section {
  margin-bottom: 3rem;
  scroll-margin-top: 4rem;
}

.area-section > h2 {
  font-size: 1.6rem;
  margin-bottom: 1.25rem;
  color: var(--color-accent);
}

.case-study > h3,
.case-study__title {
  margin: 0 0 0.5rem;
  font-size: 1.25rem;
}

.case-study__id {
  font-size: 0.78rem;
  font-weight: 450;
  color: var(--color-text-muted);
  font-family: ui-monospace, "Cascadia Code", "Segoe UI Mono", monospace;
  margin-left: 0.35rem;
}

.case-study {
  margin-bottom: 2.5rem;
  padding-bottom: 2rem;
  border-bottom: 1px solid var(--color-border);
}

.case-study:last-child {
  border-bottom: none;
}

.case-study__description {
  color: var(--color-muted);
  margin: 0 0 0.5rem;
}

.case-study__spans {
  font-family: var(--font-ui);
  font-size: 0.9rem;
  color: var(--color-muted);
  margin: 0 0 1rem;
  font-style: italic;
}

.topic-columns {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 1rem;
  overflow: visible;
}

.topic-column {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 6px;
  padding: 0.85rem;
  overflow: visible;
  min-height: 4rem;
}

.topic-column:nth-child(even) {
  background: #f6f7f9;
}

.topic-column--wide {
  grid-column: span 2;
}

.topic-column__header {
  font-family: var(--font-ui);
  font-size: 0.85rem;
  font-weight: 650;
  text-transform: uppercase;
  letter-spacing: 0.03em;
  color: var(--color-accent);
  margin: 0 0 0.75rem;
  padding-bottom: 0.4rem;
  border-bottom: 2px solid var(--color-border);
}

.reading-card {
  position: relative;
  margin-bottom: 0.85rem;
  padding-bottom: 0.85rem;
  border-bottom: 1px dashed #e5e5e5;
  overflow: visible;
}

.reading-card:last-child {
  border-bottom: none;
  margin-bottom: 0;
  padding-bottom: 0;
}

.reading-card__title {
  font-weight: 650;
  line-height: 1.35;
  display: block;
}

.reading-card__meta {
  font-family: var(--font-ui);
  font-size: 0.82rem;
  color: var(--color-muted);
  margin-top: 0.2rem;
}

.badge {
  display: inline-block;
  font-family: var(--font-ui);
  font-size: 0.68rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  padding: 0.1rem 0.35rem;
  border-radius: 3px;
  margin-left: 0.35rem;
  vertical-align: middle;
}

.badge--book {
  background: #e8eaf6;
  color: #283593;
}

.badge--sensitive {
  background: #fff3cd;
  color: #856404;
}

.axis-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.25rem;
  margin-top: 0.35rem;
}

.axis-tag {
  font-family: var(--font-ui);
  font-size: 0.68rem;
  font-weight: 600;
  padding: 0.12rem 0.4rem;
  border-radius: 999px;
  color: #fff;
}

.axis-tag--climate_change { background: var(--axis-climate_change); }
.axis-tag--gender { background: var(--axis-gender); }
.axis-tag--caste { background: var(--axis-caste); }
.axis-tag--social_capital_marginalization { background: var(--axis-social_capital_marginalization); }

.reading-card.has-tooltip {
  cursor: help;
}

.reading-card .tooltip {
  visibility: hidden;
  opacity: 0;
  position: absolute;
  left: 0;
  right: 0;
  top: calc(100% + 0.35rem);
  z-index: 50;
  background: #222;
  color: #f5f5f5;
  font-family: var(--font-ui);
  font-size: 0.78rem;
  line-height: 1.45;
  padding: 0.65rem 0.75rem;
  border-radius: 6px;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.18);
  transition: opacity 0.15s ease, visibility 0.15s ease;
  pointer-events: none;
  max-height: 220px;
  overflow-y: auto;
}

.reading-card.has-tooltip:hover .tooltip,
.reading-card.has-tooltip:focus-within .tooltip {
  visibility: visible;
  opacity: 1;
}

.placeholder-page {
  text-align: center;
  padding: 4rem 1rem;
}

.schedule-session {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  padding: 1.25rem 1.5rem;
  margin-bottom: 1.5rem;
}

.schedule-session__date {
  font-family: var(--font-ui);
  font-size: 0.9rem;
  color: var(--color-muted);
  margin: 0 0 0.35rem;
}

.schedule-session__title {
  font-family: var(--font-ui);
  font-size: 1.35rem;
  margin: 0;
  color: var(--color-accent);
}

.schedule-session__description {
  margin: 0.85rem 0 0;
}

.schedule-session__links-heading {
  font-family: var(--font-ui);
  font-size: 1rem;
  margin: 1.25rem 0 0.65rem;
}

.schedule-session__links {
  margin: 0;
  padding-left: 1.25rem;
}

.schedule-link {
  margin-bottom: 0.65rem;
}

.schedule-link__type {
  font-family: var(--font-ui);
  font-size: 0.75rem;
  font-weight: 650;
  text-transform: uppercase;
  letter-spacing: 0.03em;
  color: var(--color-muted);
  margin-right: 0.35rem;
}

.schedule-link__meta {
  display: block;
  font-family: var(--font-ui);
  font-size: 0.85rem;
  color: var(--color-muted);
  margin-top: 0.15rem;
}

.schedule-link__missing {
  color: #9b2226;
  font-size: 0.85rem;
  margin-left: 0.35rem;
}

.student-project {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  padding: 1.25rem 1.5rem;
  margin-bottom: 1.5rem;
}

.student-project__title {
  font-family: var(--font-ui);
  font-size: 1.35rem;
  margin: 0;
  color: var(--color-accent);
}

.student-project__students {
  font-family: var(--font-ui);
  font-size: 0.95rem;
  color: var(--color-text);
  margin: 0.45rem 0 0;
}

.student-project__case-study {
  font-family: var(--font-ui);
  font-size: 0.85rem;
  color: var(--color-muted);
  margin: 0.55rem 0 0;
}

.student-project__case-study code {
  font-family: ui-monospace, monospace;
  font-size: 0.78rem;
  color: var(--color-text);
}

.student-project__label {
  font-weight: 650;
  text-transform: uppercase;
  letter-spacing: 0.03em;
  font-size: 0.72rem;
}

.student-project__description {
  margin: 0.85rem 0 0;
  white-space: pre-wrap;
}

.student-project__attachment-heading {
  font-family: var(--font-ui);
  font-size: 1rem;
  margin: 1.25rem 0 0.5rem;
}

.student-project__attachment {
  font-family: var(--font-ui);
  font-size: 0.95rem;
}

.student-project__attachment-missing {
  font-family: var(--font-ui);
  font-size: 0.9rem;
  color: var(--color-muted);
  margin: 0;
}

.placeholder-page h1 {
  font-family: var(--font-ui);
  font-size: 1.5rem;
  margin-bottom: 1rem;
}

@media (max-width: 768px) {
  .examples-toc ul {
    columns: 1;
  }

  .topic-columns {
    grid-template-columns: 1fr;
  }

  .topic-column--wide {
    grid-column: span 1;
  }

  .site-header__inner {
    flex-direction: column;
    align-items: flex-start;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  .reading-card .tooltip {
    transition: none;
  }
}

.badge--primer {
  background: #eef6ff;
  color: #1a5276;
}

.topic-column--background {
  background: #faf8f3;
}

.topic-column--area-agnostic {
  background: #f3f8f4;
  border-color: #c8dcc8;
}

.topic-column__note {
  font-family: var(--font-ui);
  font-size: 0.82rem;
  color: var(--color-muted);
  margin: 0 0 0.75rem;
  line-height: 1.45;
}

.reading-card--area-agnostic {
  border-left: 3px solid #2d6a4f;
}

.badge--score {
  background: #e8f5e9;
  color: #1b5e20;
}

.badge--topic {
  background: #eef2ff;
  color: #3730a3;
}

.area-agnostic-section {
  margin-bottom: 3rem;
}

.area-agnostic-section h2 {
  font-family: var(--font-ui);
  font-size: 1.35rem;
  margin-bottom: 0.35rem;
}

.section-note {
  color: var(--color-muted);
  font-size: 0.95rem;
  margin-bottom: 1.25rem;
}

.topic-vector-block {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  padding: 1.25rem 1.5rem;
  margin-bottom: 1.25rem;
}

.topic-vector-block h2 {
  font-family: var(--font-ui);
  font-size: 1.1rem;
  margin: 0 0 0.75rem;
}

.topic-vector-block__description {
  font-size: 0.95rem;
  color: var(--color-muted);
  margin-bottom: 1rem;
}

.topic-vector-block__readings {
  margin: 0;
  padding-left: 1.25rem;
}

.topic-vector-block__readings li {
  margin-bottom: 0.45rem;
}

.topic-vector-block__readings .reading-id {
  font-family: ui-monospace, monospace;
  font-size: 0.78rem;
  color: var(--color-muted);
}

.topic-vector-block__count {
  font-family: var(--font-ui);
  font-size: 0.82rem;
  color: var(--color-muted);
  margin: 0.75rem 0 0;
}

.mapping-table {
  width: 100%;
  border-collapse: collapse;
  font-family: var(--font-ui);
  font-size: 0.9rem;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
}

.mapping-table th,
.mapping-table td {
  border: 1px solid var(--color-border);
  padding: 0.55rem 0.65rem;
  text-align: left;
  vertical-align: top;
}

.mapping-table th {
  background: #f4f4f4;
  font-weight: 600;
}

.mapping-table__num {
  text-align: right;
  white-space: nowrap;
}

.mapping-table__summary {
  font-family: var(--font-ui);
  font-size: 0.9rem;
  color: var(--color-muted);
  margin-top: 0.75rem;
}

.background-concept {
  margin-bottom: 1rem;
  padding-bottom: 0.75rem;
  border-bottom: 1px dashed #e5e5e5;
}

.background-concept:last-child {
  border-bottom: none;
  margin-bottom: 0;
  padding-bottom: 0;
}

.background-concept__title {
  font-family: var(--font-ui);
  font-size: 0.82rem;
  font-weight: 650;
  margin: 0 0 0.35rem;
  color: var(--color-text);
}

.background-concept__why {
  font-size: 0.82rem;
  color: var(--color-muted);
  margin: 0 0 0.5rem;
  line-height: 1.4;
}

.reading-card--background {
  margin-left: 0.25rem;
}