@import url('https://fonts.googleapis.com/css2?family=Playfair+Display:ital,wght@0,400;0,700;0,900;1,400&family=Inter:wght@400;500;600;700&display=swap');

/* ── Reset & Base ──────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg:          #ffffff;
  --surface:     #ffffff;
  --border:      #111111;
  --border-mid:  #b6cff5;
  --border-soft: #dce8f8;
  --border-pale: #eef4ff;
  --text-main:   #111111;
  --text-muted:  #3a4a6a;
  --text-light:  #5a7298;
  --accent:      #1a3a7a;
  --link:        #1a3a7a;
  --link-hover:  #0d2255;
}

html { scroll-behavior: smooth; font-size: 17px; }

body {
  font-family: Georgia, 'Times New Roman', serif;
  min-height: 100vh;
  color: var(--text-main);
  background: var(--bg);
}

/* ── Page wrappers ─────────────────────────────────── */
.page {
  max-width: 1100px;
  margin: 0 auto;
  padding: 32px 24px 80px;
}

.container {
  max-width: 760px;
  margin: 0 auto;
  padding: 32px 24px 80px;
}

/* ── Back link ─────────────────────────────────────── */
.back-link {
  display: inline-block;
  font-family: 'Inter', sans-serif;
  font-size: 0.7rem;
  font-weight: 600;
  color: var(--text-light);
  text-decoration: none;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  margin-bottom: 18px;
  transition: color 0.15s;
}
.back-link:hover { color: var(--accent); }

/* ══════════════════════════════════════════════════
   MASTHEAD (index page)
══════════════════════════════════════════════════ */

.masthead {
  background:
    radial-gradient(ellipse at 10% 50%, #d6e8ff 0%, transparent 50%),
    radial-gradient(ellipse at 30% 20%, #d6f0ff 0%, transparent 45%),
    radial-gradient(ellipse at 55% 80%, #e8d6ff 0%, transparent 40%),
    radial-gradient(ellipse at 75% 30%, #ffd6e7 0%, transparent 45%),
    radial-gradient(ellipse at 90% 70%, #d6ffe8 0%, transparent 40%),
    radial-gradient(ellipse at 50% 50%, #d6e8ff 0%, transparent 60%),
    #f0f5ff;
  border-radius: 12px;
  padding: 1.5rem 1.75rem 1rem;
  margin-bottom: 28px;
}

.masthead-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  margin-bottom: 10px;
}

.masthead-seal {
  width: 66px;
  height: 66px;
  border-radius: 14px;
  border: 1.5px solid rgba(255,255,255,0.85);
  background: rgba(255,255,255,0.55);
  object-fit: cover;
  flex-shrink: 0;
}

.masthead h1 {
  font-family: 'Playfair Display', serif;
  font-size: 3.4rem;
  font-weight: 900;
  letter-spacing: 0.02em;
  color: #2d1a4a;
  line-height: 1;
}

.masthead-tagline {
  border-top: 1px solid #d6e8ff;
  border-bottom: 2px solid #b6cff5;
  padding: 5px 0;
  text-align: center;
  font-family: 'Inter', sans-serif;
  font-size: 0.67rem;
  font-weight: 700;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--text-light);
}

/* ══════════════════════════════════════════════════
   UNIT NAV
══════════════════════════════════════════════════ */

.unit-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 28px;
}

.unit-btn {
  font-family: 'Inter', sans-serif;
  font-size: 0.65rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.07em;
  color: var(--text-muted);
  text-decoration: none;
  border: 1px solid var(--border-mid);
  padding: 5px 12px;
  border-radius: 2px;
  transition: color 0.15s, border-color 0.15s, background 0.15s;
}

.unit-btn:hover,
.unit-btn.active {
  color: var(--accent);
  border-color: var(--accent);
  background: #f0f5ff;
}

/* ══════════════════════════════════════════════════
   INDEX — CASE CARDS
══════════════════════════════════════════════════ */

.cases-list {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.case-card {
  border-top: 1px solid var(--border-soft);
  padding: 24px 0;
}

.case-card:first-child {
  border-top: 3px solid var(--border);
}

.case-card-meta {
  display: flex;
  align-items: center;
  gap: 12px;
  flex-wrap: wrap;
  margin-bottom: 10px;
}

.case-card-date {
  font-family: 'Inter', sans-serif;
  font-size: 0.65rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-light);
}

.case-card-title {
  font-family: 'Playfair Display', serif;
  font-size: 1.35rem;
  font-weight: 700;
  line-height: 1.25;
  margin-bottom: 10px;
}

.case-card-title a {
  color: var(--link);
  text-decoration: none;
}
.case-card-title a:hover { color: var(--link-hover); text-decoration: underline; }

.case-card-hook {
  font-size: 0.975rem;
  line-height: 1.65;
  color: var(--text-muted);
  font-style: italic;
  margin-bottom: 10px;
}

.case-card-background {
  font-size: 0.925rem;
  line-height: 1.72;
  color: var(--text-main);
  margin-bottom: 14px;
}

.case-card-what {
  font-size: 1rem;
  line-height: 1.7;
  color: var(--text-main);
  margin: 0 0 14px 0;
  padding-left: 1.2em;
}
.case-card-what li {
  margin-bottom: 4px;
}

.case-card-link {
  font-family: 'Inter', sans-serif;
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--link);
  text-decoration: none;
  letter-spacing: 0.03em;
}
.case-card-link:hover { color: var(--link-hover); text-decoration: underline; }

/* ══════════════════════════════════════════════════
   PAGINATION
══════════════════════════════════════════════════ */

.pagination {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 24px 0 0;
  border-top: 1px solid var(--border-soft);
  margin-top: 8px;
}

.page-btn {
  font-family: 'Inter', sans-serif;
  font-size: 0.72rem;
  font-weight: 700;
  color: var(--link);
  background: none;
  border: 1px solid var(--border-mid);
  padding: 7px 16px;
  cursor: pointer;
  border-radius: 2px;
  letter-spacing: 0.04em;
  transition: color 0.15s, border-color 0.15s;
}
.page-btn:hover { color: var(--link-hover); border-color: var(--link-hover); }

.page-indicator {
  font-family: 'Inter', sans-serif;
  font-size: 0.68rem;
  color: var(--text-light);
  letter-spacing: 0.05em;
}

/* ══════════════════════════════════════════════════
   CURRICULUM TAGS
══════════════════════════════════════════════════ */

.curriculum-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.curriculum-tag {
  font-family: 'Inter', sans-serif;
  font-size: 0.6rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: #1a3a7a;
  background: #d6e8ff;
  padding: 2px 7px;
  border-radius: 4px;
}

/* ══════════════════════════════════════════════════
   CASE STUDY PAGE — HEADER
══════════════════════════════════════════════════ */

.case-header {
  border-top: 5px solid var(--border);
  padding-top: 20px;
  margin-bottom: 36px;
}

.case-meta-bar {
  display: flex;
  align-items: center;
  gap: 14px;
  flex-wrap: wrap;
  margin-bottom: 14px;
}

.case-date {
  font-family: 'Inter', sans-serif;
  font-size: 0.68rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-light);
}

.case-header h1 {
  font-family: 'Playfair Display', serif;
  font-size: 2.2rem;
  font-weight: 900;
  line-height: 1.15;
  color: var(--text-main);
  margin-bottom: 14px;
}

.hook {
  font-size: 1.1rem;
  line-height: 1.65;
  color: var(--text-muted);
  font-style: italic;
  margin-bottom: 14px;
}

.source-link {
  font-family: 'Inter', sans-serif;
  font-size: 0.68rem;
  font-weight: 600;
  color: var(--text-light);
  text-decoration: none;
  letter-spacing: 0.04em;
}
.source-link:hover { color: var(--link); }

/* ══════════════════════════════════════════════════
   CASE STUDY PAGE — SECTIONS
══════════════════════════════════════════════════ */

main {
  display: flex;
  flex-direction: column;
  gap: 0;
}

.case-section {
  border-top: 1px solid var(--border-soft);
  padding: 28px 0;
}

.case-section h2 {
  font-family: 'Inter', sans-serif;
  font-size: 0.62rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.2em;
  color: var(--text-light);
  margin-bottom: 14px;
}

.case-section p {
  font-size: 1rem;
  line-height: 1.78;
  color: var(--text-main);
}

.case-section p + p {
  margin-top: 1em;
}

/* What Happened */
.what-happened-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.what-happened-list li {
  font-size: 1rem;
  line-height: 1.68;
  color: var(--text-main);
  padding-left: 20px;
  position: relative;
}

.what-happened-list li::before {
  content: '–';
  position: absolute;
  left: 0;
  color: var(--border-mid);
}

/* Data Snapshot */
.data-snapshot {
  background: var(--surface);
  border: 1px solid var(--border-soft);
  border-top: 3px solid var(--border);
  padding: 20px 24px 24px;
}

.snapshot-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.snapshot-list li {
  font-family: 'Inter', sans-serif;
  font-size: 0.9rem;
  line-height: 1.6;
  color: var(--text-muted);
  padding-left: 20px;
  position: relative;
}

.snapshot-list li::before {
  content: '▸';
  position: absolute;
  left: 0;
  color: var(--accent);
  font-size: 0.7rem;
  top: 3px;
}

/* The Tension */
.the-tension {
  border-top: 3px solid var(--border);
}

.the-tension h2 {
  color: var(--text-main);
  font-size: 0.75rem;
  margin-bottom: 18px;
}

/* ══════════════════════════════════════════════════
   CASE STUDY PAGE — QUESTIONS
══════════════════════════════════════════════════ */

.questions-section {
  border-top: 3px solid var(--border);
  margin-top: 12px;
  padding: 28px 0 0;
}

.questions-section h2 {
  font-family: 'Inter', sans-serif;
  font-size: 0.62rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.2em;
  color: var(--text-light);
  margin-bottom: 20px;
}

.reflection-list {
  list-style: none;
  counter-reset: question;
  display: flex;
  flex-direction: column;
  gap: 16px;
  margin-bottom: 28px;
}

.reflection-list li {
  counter-increment: question;
  font-size: 0.975rem;
  line-height: 1.68;
  color: var(--text-main);
  padding-left: 36px;
  position: relative;
}

.reflection-list li::before {
  content: counter(question);
  position: absolute;
  left: 0;
  font-family: 'Playfair Display', serif;
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--accent);
  line-height: 1.4;
  width: 24px;
  text-align: right;
}

/* Question tabs */
.questions-tabs {
  display: flex;
  gap: 0;
  margin-bottom: 24px;
  border-bottom: 1px solid var(--border-soft);
}

.questions-tab-btn {
  font-family: 'Inter', sans-serif;
  font-size: 0.62rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: var(--text-light);
  background: none;
  border: none;
  border-bottom: 2px solid transparent;
  padding: 8px 16px 6px;
  margin-bottom: -1px;
  cursor: pointer;
  transition: color 0.15s, border-color 0.15s;
}

.questions-tab-btn:hover { color: var(--text-main); }

.questions-tab-btn.active {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

.questions-panel { display: none; }
.questions-panel.active { display: block; }

/* IB questions list */
.ib-list {
  list-style: none;
  counter-reset: ib-question;
  display: flex;
  flex-direction: column;
  gap: 20px;
  margin-bottom: 28px;
}

.ib-q-item {
  counter-increment: ib-question;
  padding-left: 36px;
  position: relative;
}

.ib-q-item::before {
  content: counter(ib-question);
  position: absolute;
  left: 0;
  font-family: 'Playfair Display', serif;
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--accent);
  line-height: 1.4;
  width: 24px;
  text-align: right;
}

.ib-q-text {
  font-size: 0.975rem;
  line-height: 1.68;
  color: var(--text-main);
  margin-bottom: 6px;
}

.ib-q-notes {
  display: none;
  font-size: 0.83rem;
  line-height: 1.6;
  color: var(--text-light);
  font-style: italic;
  margin-top: 6px;
}

.ib-panel-answers-visible .ib-q-notes { display: block; }

.ib-answers-btn {
  font-family: 'Inter', sans-serif;
  font-size: 0.65rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--accent);
  background: none;
  border: 1px solid var(--border-mid);
  padding: 6px 14px;
  cursor: pointer;
  border-radius: 2px;
  margin: 4px 0 20px;
  transition: color 0.15s, border-color 0.15s, background 0.15s;
}

.ib-answers-btn:hover {
  background: #f0f5ff;
  border-color: var(--accent);
}

.ib-disclaimer {
  font-family: 'Inter', sans-serif;
  font-size: 0.7rem;
  line-height: 1.6;
  color: var(--text-light);
  border-top: 1px solid var(--border-pale);
  padding-top: 12px;
  margin-top: 4px;
}

/* Extension */
.extension {
  border-top: 1px solid var(--border-soft);
  padding-top: 20px;
  padding-bottom: 8px;
}

.extension h3 {
  font-family: 'Inter', sans-serif;
  font-size: 0.62rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.2em;
  color: var(--text-light);
  margin-bottom: 12px;
}

.extension p {
  font-size: 0.9rem;
  line-height: 1.7;
  color: var(--text-muted);
  font-style: italic;
}

/* ══════════════════════════════════════════════════
   SOURCES SECTION
══════════════════════════════════════════════════ */

.sources-section {
  border-top: 1px solid var(--border-soft);
  padding: 20px 0 0;
  margin-top: 8px;
}

.sources-section h2 {
  font-family: 'Inter', sans-serif;
  font-size: 0.62rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.2em;
  color: var(--text-light);
  margin-bottom: 10px;
}

.sources-section p {
  font-family: 'Inter', sans-serif;
  font-size: 0.8rem;
  line-height: 1.6;
  color: var(--text-muted);
}

.sources-section a {
  color: var(--link);
  text-decoration: underline;
}
.sources-section a:hover { color: var(--link-hover); }

/* ── Footer ──────────────────────────────────────── */
footer {
  margin-top: 52px;
  padding-top: 14px;
  border-top: 1px solid var(--border-soft);
  font-family: 'Inter', sans-serif;
  font-size: 0.7rem;
  color: var(--text-light);
  letter-spacing: 0.04em;
  text-align: center;
}

/* ── Empty state ─────────────────────────────────── */
.empty-state {
  color: var(--text-muted);
  font-size: 0.9rem;
  padding: 20px 0;
  font-style: italic;
}

/* ── Mobile ──────────────────────────────────────── */
@media (max-width: 640px) {
  .page,
  .container { padding: 24px 16px 60px; }

  .masthead h1 { font-size: 2.4rem; }
  .case-header h1 { font-size: 1.6rem; }
  .hook { font-size: 1rem; }

  .data-snapshot { padding: 16px 18px 20px; }

  .reflection-list li { padding-left: 28px; }
}