/* ────────────────────────────────────────────────────────────
   Reset + base — same Apple-aesthetic system as education site
   ──────────────────────────────────────────────────────────── */
:root {
  --bg: #ffffff;
  --surface: #fbfbfd;
  --ink: #1d1d1f;
  --ink-2: #424245;
  --muted: #6e6e73;
  --faint: #86868b;
  --border: rgba(0, 0, 0, 0.08);
  --border-soft: rgba(0, 0, 0, 0.06);
  --accent: #0066cc;
  --accent-2: #0F7038;
  --accent-2-bg: rgba(15, 112, 56, 0.08);
  /* INSEAD red, used very sparingly for the eyebrow accent only */
  --insead: #cc092f;
}
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-font-smoothing: antialiased; -moz-osx-font-smoothing: grayscale; scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display", "SF Pro Text", "Helvetica Neue", Helvetica, Arial, sans-serif;
  font-size: 17px;
  line-height: 1.55;
  letter-spacing: -0.022em;
  font-weight: 400;
}
img { display: block; max-width: 100%; }
a { color: var(--accent); text-decoration: none; transition: color 0.15s ease; }
a:hover { color: #0077ed; text-decoration: underline; text-underline-offset: 3px; }

.container { max-width: 760px; margin: 0 auto; padding: 0 22px; }
.container-wide { max-width: 980px; margin: 0 auto; padding: 0 22px; }

/* ────────────────────────────────────────────────────────────
   Nav
   ──────────────────────────────────────────────────────────── */
nav.site {
  position: sticky; top: 0; z-index: 50;
  background: rgba(255, 255, 255, 0.78);
  backdrop-filter: saturate(180%) blur(20px);
  -webkit-backdrop-filter: saturate(180%) blur(20px);
  border-bottom: 1px solid var(--border-soft);
}
nav.site .row {
  max-width: 980px; margin: 0 auto;
  padding: 0 22px; height: 52px;
  display: flex; align-items: center; justify-content: space-between;
}
nav.site .brand { font-size: 17px; font-weight: 500; color: var(--ink); letter-spacing: -0.022em; }
nav.site .brand a { color: inherit; }
nav.site .brand .sub { color: var(--muted); font-weight: 400; }
nav.site .links { display: flex; align-items: center; gap: 22px; font-size: 13px; }
nav.site .links a { color: var(--ink); opacity: 0.88; transition: opacity 0.18s ease; }
nav.site .links a:hover { opacity: 1; text-decoration: none; }
@media (max-width: 640px) { nav.site .links a:not(.btn-ghost) { display: none; } }

/* ────────────────────────────────────────────────────────────
   Header — INSEAD eyebrow + title + dek + meta
   ──────────────────────────────────────────────────────────── */
header.post {
  padding: 56px 22px 0;
  max-width: 760px;
  margin: 0 auto;
}
@media (min-width: 768px) { header.post { padding: 88px 22px 0; } }

.eyebrow {
  display: inline-block;
  font-size: 12px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--insead);
  margin: 0 0 18px;
  padding: 4px 0;
  border-bottom: 2px solid var(--insead);
}

h1.title {
  font-size: clamp(34px, 5vw, 56px);
  line-height: 1.06;
  letter-spacing: -0.03em;
  font-weight: 600;
  margin: 0 0 18px;
  color: var(--ink);
  max-width: 16ch;
}
h1.title .accent { color: var(--accent-2); display: block; }

p.dek {
  font-size: clamp(18px, 1.8vw, 22px);
  line-height: 1.45;
  letter-spacing: -0.016em;
  color: var(--muted);
  margin: 0 0 28px;
  max-width: 48ch;
}

.meta {
  display: flex; flex-wrap: wrap; gap: 14px;
  font-family: ui-monospace, SFMono-Regular, "SF Mono", Menlo, monospace;
  font-size: 12px; color: var(--muted);
  text-transform: uppercase; letter-spacing: 0.06em;
  padding: 18px 0;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  margin-bottom: 36px;
}
.meta .sep { color: var(--faint); }

/* ────────────────────────────────────────────────────────────
   Overview — skimmable list of the 5 sessions
   ──────────────────────────────────────────────────────────── */
.overview {
  margin: 0 auto 36px;
  max-width: 760px;
  padding: 26px 26px 22px;
  background: #ffffff;
  border: 1px solid var(--border);
  border-radius: 18px;
  box-shadow: 0 12px 32px rgba(0, 0, 0, 0.03);
}
.overview-label {
  font-size: 11px; text-transform: uppercase; letter-spacing: 0.10em;
  color: var(--accent-2); font-weight: 600;
  margin: 0 0 16px;
}
.overview-list {
  margin: 0; padding: 0; list-style: none;
  display: flex; flex-direction: column;
}
.overview-list li {
  border-top: 1px solid var(--border-soft);
}
.overview-list li:first-child { border-top: none; }
.overview-list a {
  display: grid;
  grid-template-columns: 36px 1fr;
  gap: 6px 14px;
  padding: 12px 0;
  color: inherit;
  text-decoration: none;
  align-items: baseline;
  transition: background 0.15s ease;
  border-radius: 6px;
}
@media (min-width: 640px) {
  .overview-list a {
    grid-template-columns: 36px 9.5rem 1fr;
    align-items: baseline;
  }
}
.overview-list a:hover { background: var(--surface); text-decoration: none; }
.overview-list .num {
  font-family: ui-monospace, SFMono-Regular, "SF Mono", Menlo, monospace;
  font-size: 12px;
  color: var(--accent-2);
  font-weight: 600;
  letter-spacing: 0.04em;
}
.overview-list .who {
  font-size: 15px;
  font-weight: 600;
  color: var(--ink);
  letter-spacing: -0.014em;
}
.overview-list .line {
  font-size: 15px;
  color: var(--muted);
  line-height: 1.45;
  letter-spacing: -0.012em;
  grid-column: 2 / -1;
}
@media (min-width: 640px) {
  .overview-list .line { grid-column: auto; }
}
.overview-foot {
  margin: 18px 0 0;
  text-align: right;
  font-size: 13px;
}
.overview-foot a {
  color: var(--accent);
  font-weight: 500;
}

/* ────────────────────────────────────────────────────────────
   Per-session TLDR
   ──────────────────────────────────────────────────────────── */
.session-tldr {
  margin: 0 0 22px;
  padding: 14px 16px;
  background: var(--surface);
  border: 1px solid var(--border-soft);
  border-left: 3px solid var(--accent-2);
  border-radius: 12px;
  display: flex;
  gap: 12px;
  align-items: flex-start;
}
.session-tldr .tldr-tag {
  flex-shrink: 0;
  font-family: ui-monospace, SFMono-Regular, "SF Mono", Menlo, monospace;
  font-size: 10px;
  font-weight: 600;
  color: var(--accent-2);
  background: var(--accent-2-bg);
  padding: 3px 8px;
  border-radius: 999px;
  letter-spacing: 0.06em;
  margin-top: 1px;
}
.session-tldr p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.55;
  color: var(--ink);
  letter-spacing: -0.012em;
}

/* ────────────────────────────────────────────────────────────
   TLDR (bottom-line) box
   ──────────────────────────────────────────────────────────── */
.tldr {
  padding: 22px 24px;
  border-radius: 16px;
  border: 1px solid var(--border-soft);
  background: var(--surface);
  margin: 0 auto 36px;
  max-width: 760px;
}
.tldr .label {
  font-size: 11px; font-weight: 600;
  color: var(--accent-2);
  text-transform: uppercase; letter-spacing: 0.10em;
  margin: 0 0 10px;
}
.tldr p { margin: 0; font-size: 16px; line-height: 1.6; color: var(--ink); }

/* ────────────────────────────────────────────────────────────
   Article body
   ──────────────────────────────────────────────────────────── */
article.body {
  max-width: 760px;
  margin: 0 auto;
  padding: 0 22px 64px;
}
article.body > p {
  font-size: 18px;
  line-height: 1.65;
  color: var(--ink-2);
  margin: 0 0 1.1em;
  letter-spacing: -0.014em;
}
article.body > p.lede {
  font-size: 20px;
  color: var(--ink);
  font-weight: 400;
}
article.body strong { color: var(--ink); font-weight: 500; }
article.body em { color: var(--ink-2); }

/* ────────────────────────────────────────────────────────────
   Session block
   ──────────────────────────────────────────────────────────── */
.session {
  margin: 56px 0 0;
  padding-top: 36px;
  border-top: 1px solid var(--border);
}
.session-meta {
  display: flex; flex-wrap: wrap; align-items: center; gap: 10px 14px;
  margin: 0 0 12px;
}
.session-time {
  display: inline-block;
  font-family: ui-monospace, SFMono-Regular, "SF Mono", Menlo, monospace;
  font-size: 11px;
  letter-spacing: 0.05em;
  color: var(--accent-2);
  background: var(--accent-2-bg);
  padding: 3px 9px;
  border-radius: 999px;
}
.session-tag {
  font-size: 11px;
  letter-spacing: 0.10em;
  text-transform: uppercase;
  color: var(--muted);
  font-weight: 500;
}
.session h2 {
  font-size: clamp(24px, 3vw, 32px);
  line-height: 1.18;
  letter-spacing: -0.022em;
  font-weight: 600;
  margin: 0 0 8px;
  color: var(--ink);
}
.session .speakers {
  font-size: 14px;
  color: var(--muted);
  margin: 0 0 22px;
  letter-spacing: -0.012em;
}
.session .speakers strong { color: var(--ink-2); font-weight: 500; }
.session p {
  font-size: 17px;
  line-height: 1.65;
  color: var(--ink-2);
  margin: 0 0 1em;
  letter-spacing: -0.014em;
}

.pullquote {
  margin: 24px 0;
  padding: 16px 22px;
  border-left: 3px solid var(--accent);
  background: var(--surface);
  border-radius: 0 12px 12px 0;
  font-size: 18px;
  line-height: 1.5;
  color: var(--ink);
  letter-spacing: -0.014em;
}
.pullquote cite {
  display: block;
  margin-top: 10px;
  font-style: normal;
  font-family: ui-monospace, SFMono-Regular, "SF Mono", Menlo, monospace;
  font-size: 12px;
  color: var(--muted);
  letter-spacing: 0.02em;
}

.takeaway {
  margin: 22px 0 0;
  padding: 14px 18px;
  border-radius: 12px;
  background: var(--accent-2-bg);
  border-left: 3px solid var(--accent-2);
}
.takeaway .label {
  font-size: 10px; text-transform: uppercase; letter-spacing: 0.12em;
  color: var(--accent-2); font-weight: 600; margin: 0 0 4px;
}
.takeaway p {
  font-size: 16px;
  line-height: 1.5;
  color: var(--ink);
  margin: 0;
  font-weight: 500;
  letter-spacing: -0.012em;
}

.inline-download {
  display: inline-flex; align-items: center; gap: 8px;
  margin: 18px 0 0;
  padding: 8px 14px;
  border-radius: 999px;
  background: #ffffff;
  border: 1px solid var(--border);
  font-size: 13px;
  color: var(--ink);
  cursor: pointer;
  transition: border-color 0.18s ease, background 0.18s ease, color 0.18s ease;
  font-family: inherit;
}
.inline-download:hover { border-color: var(--accent); color: var(--accent); }
.inline-download::before {
  content: "↓"; font-weight: 600;
}

/* ────────────────────────────────────────────────────────────
   The thread (closing synthesis)
   ──────────────────────────────────────────────────────────── */
.thread {
  margin: 64px 0 0;
  padding: 36px 28px;
  background: var(--surface);
  border-radius: 18px;
  border: 1px solid var(--border-soft);
}
.thread h2 {
  font-size: 24px;
  margin: 0 0 14px;
  letter-spacing: -0.022em;
  color: var(--ink);
}
.thread p {
  font-size: 17px;
  line-height: 1.65;
  color: var(--ink-2);
  margin: 0 0 0.9em;
  letter-spacing: -0.014em;
}
.thread p:last-child { margin-bottom: 0; }

/* ────────────────────────────────────────────────────────────
   Transcript Vault
   ──────────────────────────────────────────────────────────── */
section.vault {
  margin: 64px auto 0;
  max-width: 760px;
  padding: 0 22px 64px;
}
.vault-card {
  border-radius: 22px;
  border: 1px solid var(--border);
  background: #ffffff;
  padding: 36px 28px;
  box-shadow: 0 14px 36px rgba(0, 0, 0, 0.04);
}
@media (min-width: 768px) { .vault-card { padding: 44px 40px; } }
.vault-card h2 {
  font-size: 24px;
  margin: 0 0 8px;
  letter-spacing: -0.022em;
  color: var(--ink);
}
.vault-card .lede {
  font-size: 15px;
  color: var(--muted);
  margin: 0 0 26px;
  letter-spacing: -0.012em;
}

.vault-form {
  display: flex; flex-wrap: wrap; gap: 10px;
  margin-bottom: 12px;
  align-items: center;
}
.vault-form input {
  flex: 1; min-width: 200px;
  padding: 12px 16px;
  border-radius: 12px;
  border: 1px solid var(--border);
  font-size: 15px;
  font-family: inherit;
  letter-spacing: -0.012em;
  background: #fff;
  outline: none;
  transition: border-color 0.18s ease, box-shadow 0.18s ease;
}
.vault-form input:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 4px rgba(0, 102, 204, 0.12);
}
.vault-form button {
  padding: 12px 22px;
  border-radius: 999px;
  border: none;
  background: linear-gradient(135deg, #0066cc, #0F7038);
  color: white;
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  font-family: inherit;
  transition: opacity 0.18s ease, transform 0.1s ease;
}
.vault-form button:hover { opacity: 0.92; }
.vault-form button:active { transform: scale(0.98); }

.vault-hint {
  font-size: 13px;
  color: var(--faint);
  margin: 0 0 0;
  font-style: italic;
}
.vault-error {
  font-size: 13px;
  color: var(--insead);
  margin: 10px 0 0;
  font-weight: 500;
}

.vault-list {
  display: none;
  margin-top: 26px;
  border-top: 1px solid var(--border);
  padding-top: 24px;
}
.vault-list.open { display: block; }
.vault-list .ok {
  font-size: 13px; color: var(--accent-2); font-weight: 600;
  margin: 0 0 18px;
  letter-spacing: -0.012em;
}
.vault-list .ok::before { content: "✓ "; }
.vault-files { display: flex; flex-direction: column; gap: 10px; margin: 0; padding: 0; list-style: none; }
.vault-files li {
  display: flex; align-items: center; justify-content: space-between;
  padding: 14px 16px;
  border-radius: 12px;
  background: var(--surface);
  border: 1px solid var(--border-soft);
}
.vault-files li:hover { border-color: var(--accent); }
.vault-files .name {
  font-size: 14px;
  color: var(--ink);
  letter-spacing: -0.012em;
  font-weight: 500;
  margin-right: 12px;
  flex: 1;
}
.vault-files .size {
  font-family: ui-monospace, SFMono-Regular, "SF Mono", Menlo, monospace;
  font-size: 11px;
  color: var(--muted);
  margin-right: 12px;
}
.vault-files .dl {
  font-size: 13px;
  color: var(--accent);
  border: 1px solid transparent;
  padding: 6px 12px;
  border-radius: 999px;
  font-weight: 500;
  cursor: pointer;
  text-decoration: none;
  white-space: nowrap;
}
.vault-files .dl:hover { background: rgba(0, 102, 204, 0.08); }
.vault-files .dl::before { content: "↓ "; }

/* ────────────────────────────────────────────────────────────
   Footer
   ──────────────────────────────────────────────────────────── */
footer.site {
  background: #f5f5f7;
  padding: 30px 22px;
  font-size: 12px;
  color: var(--muted);
}
footer.site .row {
  max-width: 980px; margin: 0 auto;
  display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 12px;
}
footer.site a { color: var(--muted); }
footer.site a:hover { color: var(--ink); text-decoration: underline; }

/* ────────────────────────────────────────────────────────────
   Mobile pass
   ──────────────────────────────────────────────────────────── */
@media (max-width: 640px) {
  body { font-size: 16px; }
  header.post { padding: 40px 22px 0; }
  .meta { font-size: 11px; gap: 10px; padding: 14px 0; }
  .session { margin-top: 44px; padding-top: 28px; }
  .session h2 { font-size: 22px; }
  .session p { font-size: 16px; }
  article.body > p { font-size: 16px; }
  .pullquote { font-size: 16px; padding: 14px 18px; }
  .thread { padding: 28px 22px; }
  .vault-card { padding: 28px 22px; }
  .vault-form { flex-direction: column; align-items: stretch; }
  .vault-form button { width: 100%; }
}