/* Mumbai AI Lab. Colours come from the Socratic Tutor icon; type is Anek by Ek Type, Mumbai. */

:root {
  --navy: #16324f;
  --navy-deep: #0e2239;
  --orange: #e8743b;
  --orange-ink: #b4521d;
  --bg: #ffffff;
  --panel: #edf1f5;
  --ink: #0f1b2d;
  --ink-2: #33445a;
  --muted: #677487;
  --rule: #0f1b2d;
  --hair: #d3dae2;
  --on-navy: #ffffff;
  --on-navy-2: #b7c6d8;
  --claude: #d97757;
  --wide: 1180px;
  color-scheme: light;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0b1828;
    --panel: #11233a;
    --ink: #e9eef5;
    --ink-2: #bccad9;
    --muted: #8a99ac;
    --rule: #e9eef5;
    --hair: #223a58;
    --orange-ink: #f39261;
    --navy-deep: #08131f;
    color-scheme: dark;
  }
}

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } * { transition: none !important; } }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: "Anek Latin", "Helvetica Neue", Arial, sans-serif;
  font-variation-settings: "wdth" 100;
  font-size: 19px;
  line-height: 1.55;
}

a { color: inherit; text-decoration-thickness: 1.5px; text-underline-offset: 3px; }
a:hover { color: var(--orange-ink); }
a:focus-visible, button:focus-visible { outline: 3px solid var(--orange); outline-offset: 3px; }

.wrap { max-width: var(--wide); margin: 0 auto; padding: 0 32px; }

.display {
  font-family: "Anek Latin", "Arial Narrow", sans-serif;
  font-variation-settings: "wdth" 75;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: -0.005em;
  line-height: 0.88;
}
.cond { font-variation-settings: "wdth" 75; }
.deva { font-family: "Anek Devanagari", "Anek Latin", sans-serif; }

/* ---------- top bar and hero ---------- */

.masthead { background: var(--navy); color: var(--on-navy); position: relative; overflow: hidden; }

.bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  padding-top: 22px;
  padding-bottom: 22px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.16);
}
.mark {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  font-weight: 700;
  font-size: 22px;
  letter-spacing: 0.02em;
  font-variation-settings: "wdth" 75;
}
.mark svg { width: 34px; height: 34px; display: block; }
.mark:hover { color: var(--on-navy); }
.nav { display: flex; gap: 26px; list-style: none; margin: 0; padding: 0; font-size: 17px; }
.nav a { text-decoration: none; color: var(--on-navy-2); }
.nav a:hover { color: var(--on-navy); }

.hero {
  display: grid;
  grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  gap: 56px;
  padding-top: 72px;
  padding-bottom: 96px;
  position: relative;
  z-index: 1;
}
.eyebrow { margin: 0 0 18px; color: var(--orange); font-weight: 600; letter-spacing: 0.08em; text-transform: uppercase; font-size: 15px; }
.hero h1 { margin: 0; font-size: clamp(76px, 12.5vw, 172px); }
.hero h1 span { display: block; }
.hero .deva-name { margin: 14px 0 0; font-size: clamp(28px, 3.4vw, 44px); font-weight: 600; color: var(--orange); line-height: 1.2; }
.hero .lede { margin: 30px 0 0; max-width: 34em; font-size: 22px; line-height: 1.45; color: #dfe7f1; }
.hero .jump { margin: 28px 0 0; display: flex; flex-wrap: wrap; gap: 12px 28px; font-weight: 600; font-size: 18px; }
.hero .jump a { color: var(--on-navy); }
.hero .jump a:hover { color: var(--orange); }


/* the dialogue card in the hero */
.dialogue {
  margin: 0;
  align-self: end;
  background: var(--bg);
  color: var(--ink);
  padding: 26px 28px 22px;
  border-top: 6px solid var(--orange);
}
.dialogue .label { margin: 0 0 14px; font-size: 14px; letter-spacing: 0.08em; text-transform: uppercase; color: var(--muted); font-weight: 600; }
.dialogue dl { margin: 0; display: grid; grid-template-columns: auto 1fr; gap: 10px 16px; }
.dialogue dt { font-weight: 700; font-size: 14px; letter-spacing: 0.08em; text-transform: uppercase; padding-top: 3px; }
.dialogue dt.tutor { color: var(--orange-ink); }
.dialogue dt.student { color: var(--muted); }
.dialogue dd { margin: 0; font-size: 18px; line-height: 1.45; }
.dialogue dd.tutor { font-weight: 600; }
.dialogue .note { margin: 16px 0 0; font-size: 14.5px; color: var(--muted); }

/* ---------- sections ---------- */

main section { padding: 0; }
.row {
  display: grid;
  grid-template-columns: 300px minmax(0, 1fr);
  gap: 56px;
  border-top: 3px solid var(--rule);
  padding-top: 26px;
  padding-bottom: 88px;
}
main > .wrap > section:first-child .row { margin-top: 88px; }
.row h2 { margin: 0; font-size: 52px; }
.row h2 + .sub { margin: 14px 0 0; color: var(--muted); font-size: 17px; max-width: 16em; }
.row .body > p { margin: 0 0 16px; max-width: 40em; color: var(--ink-2); }
.row .body > p.big { font-size: 25px; line-height: 1.4; color: var(--ink); font-weight: 500; max-width: 30em; }

.stats { display: grid; grid-template-columns: 1fr 1fr; gap: 0; margin: 34px 0 30px; border-top: 1px solid var(--hair); }
.stat { padding: 22px 28px 6px 0; }
.stat + .stat { padding-left: 28px; border-left: 1px solid var(--hair); }
.stat .n { font-size: 96px; color: var(--orange-ink); }
.stat p { margin: 10px 0 0; font-size: 17px; color: var(--ink-2); max-width: 22em; }
.stat cite { display: block; margin-top: 8px; font-style: normal; font-size: 15px; color: var(--muted); }

.refs { margin: 18px 0 0; padding: 0; list-style: none; font-size: 15.5px; color: var(--muted); }
.refs li { margin: 4px 0; }

/* ---------- method: rules and the hint ladder ---------- */

.rules { margin: 0 0 36px; padding: 0; list-style: none; counter-reset: rule; display: grid; grid-template-columns: 1fr 1fr; gap: 0 36px; }
.rules li { counter-increment: rule; padding: 14px 0 14px 46px; border-top: 1px solid var(--hair); position: relative; color: var(--ink-2); }
.rules li::before {
  content: counter(rule);
  position: absolute;
  left: 0;
  top: 8px;
  font-size: 34px;
  font-weight: 800;
  font-variation-settings: "wdth" 75;
  color: var(--orange-ink);
  line-height: 1;
}
.rules b { color: var(--ink); font-weight: 600; }

.ladder {
  background: var(--panel);
  display: grid;
  grid-template-columns: 210px minmax(0, 1fr);
  gap: 0;
}
.ladder .rail {
  background: var(--navy);
  color: var(--on-navy);
  padding: 24px 22px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.ladder .rail h3 { margin: 0 0 10px; font-size: 30px; }
.ladder .rungs { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column-reverse; gap: 6px; }
.ladder .rungs li {
  border: 2px solid rgba(255, 255, 255, 0.28);
  padding: 7px 10px;
  font-size: 15px;
  display: flex;
  justify-content: space-between;
  color: var(--on-navy-2);
  transition: background 0.25s ease, border-color 0.25s ease, color 0.25s ease;
}
.ladder .rungs li span:first-child { font-weight: 700; font-variation-settings: "wdth" 75; }
.ladder .rungs li.on { background: var(--orange); border-color: var(--orange); color: #fff; }
.ladder .count { margin-top: auto; padding-top: 14px; font-size: 14px; color: var(--on-navy-2); }

.ladder .stage { padding: 26px 30px 28px; min-height: 420px; display: flex; flex-direction: column; }
.ladder .problem { margin: 0 0 18px; font-size: 15px; letter-spacing: 0.08em; text-transform: uppercase; color: var(--muted); font-weight: 600; }
.ladder .problem b { display: block; margin-top: 4px; font-size: 30px; letter-spacing: 0; text-transform: none; color: var(--ink); font-weight: 700; }
.ladder .turns { list-style: none; margin: 0; padding: 0; display: grid; gap: 12px; }
.ladder .turns li { display: grid; grid-template-columns: 84px minmax(0, 1fr); gap: 14px; animation: rise 0.3s ease both; }
.ladder .turns .who { font-size: 13.5px; letter-spacing: 0.08em; text-transform: uppercase; font-weight: 700; padding-top: 4px; }
.ladder .turns .tutor .who { color: var(--orange-ink); }
.ladder .turns .student .who { color: var(--muted); }
.ladder .turns .say { font-size: 18px; }
.ladder .turns .tutor .say { font-weight: 500; color: var(--ink); }
.ladder .turns .student .say { color: var(--ink-2); font-style: italic; }
.ladder .turns .tag { display: inline-block; margin-right: 8px; font-size: 12.5px; letter-spacing: 0.06em; text-transform: uppercase; background: var(--orange); color: #fff; padding: 1px 7px; font-weight: 700; font-style: normal; vertical-align: 2px; }
@keyframes rise { from { opacity: 0; transform: translateY(6px); } to { opacity: 1; transform: none; } }

.controls { margin-top: auto; padding-top: 24px; display: flex; flex-wrap: wrap; gap: 10px; }
.controls button {
  font: inherit;
  font-size: 17px;
  font-weight: 600;
  padding: 10px 18px;
  border: 2px solid var(--ink);
  background: transparent;
  color: var(--ink);
  cursor: pointer;
}
.controls button.primary { background: var(--ink); color: var(--bg); }
.controls button:hover { border-color: var(--orange); }
.controls button.primary:hover { background: var(--orange); border-color: var(--orange); color: #fff; }
.controls button:disabled { opacity: 0.35; cursor: default; }
.ladder-foot { margin: 14px 0 0; font-size: 15.5px; color: var(--muted); max-width: 46em; }

/* ---------- sessions ---------- */

.facts { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); margin: 6px 0 24px; border-top: 1px solid var(--hair); }
.facts div { padding: 16px 20px 16px 0; border-bottom: 1px solid var(--hair); }
.facts div:nth-child(2n) { padding-left: 20px; border-left: 1px solid var(--hair); }
.facts dt { font-size: 14px; letter-spacing: 0.08em; text-transform: uppercase; color: var(--muted); font-weight: 600; }
.facts dd { margin: 4px 0 0; font-size: 22px; font-weight: 600; line-height: 1.3; }

/* ---------- updates ---------- */

.updates { list-style: none; margin: 0; padding: 0; }
.update { display: grid; grid-template-columns: 120px minmax(0, 1fr); gap: 28px; padding: 26px 0 30px; border-top: 1px solid var(--hair); }
.update:first-child { border-top: 0; padding-top: 0; }
.update time { display: block; line-height: 1; }
.update time .d { display: block; font-size: 64px; font-weight: 800; font-variation-settings: "wdth" 75; }
.update time .my { display: block; margin-top: 6px; font-size: 15px; letter-spacing: 0.08em; text-transform: uppercase; color: var(--muted); font-weight: 600; }
.update .kind { margin: 0 0 6px; font-size: 13.5px; letter-spacing: 0.1em; text-transform: uppercase; font-weight: 700; color: var(--orange-ink); }
.update h3 { margin: 0 0 8px; font-size: 34px; line-height: 1.05; }
.update p { margin: 0 0 10px; color: var(--ink-2); max-width: 40em; }
.update .go { font-weight: 600; display: flex; flex-wrap: wrap; gap: 6px 22px; font-size: 17px; }

.claude-badge {
  display: inline-grid;
  grid-template-columns: 40px auto;
  align-items: center;
  gap: 4px 14px;
  margin: 8px 0 14px;
  padding: 12px 18px 12px 14px;
  border: 2px solid var(--claude);
  background: var(--bg);
  text-decoration: none;
}
.claude-badge svg { grid-row: span 2; width: 40px; height: 40px; fill: var(--claude); }
.claude-badge strong { font-size: 19px; line-height: 1.15; font-weight: 700; color: var(--ink); }
.claude-badge small { font-size: 14.5px; color: var(--muted); line-height: 1.2; }

.origins { margin: 26px 0 0; padding: 18px 22px; background: var(--panel); }
.origins h3 { margin: 0 0 6px; font-size: 24px; }
.origins ul { margin: 0; padding: 0; list-style: none; }
.origins li { padding: 6px 0; color: var(--ink-2); display: grid; grid-template-columns: 72px minmax(0, 1fr); gap: 12px; }
.origins li b { color: var(--ink); font-weight: 700; font-variation-settings: "wdth" 75; font-size: 20px; }

/* ---------- plugin ---------- */

.plugin { display: grid; grid-template-columns: 128px minmax(0, 1fr); gap: 32px; }
.plugin img { width: 128px; height: 128px; display: block; }
.plugin h3 { margin: 0 0 4px; font-size: 40px; }
.plugin .by { margin: 0 0 14px; color: var(--muted); }
.plugin p { margin: 0 0 14px; color: var(--ink-2); max-width: 40em; }
.install { margin: 18px 0 0; display: grid; gap: 14px; }
.install h4 { margin: 0 0 6px; font-size: 15px; letter-spacing: 0.08em; text-transform: uppercase; color: var(--muted); }
.install pre {
  margin: 0;
  padding: 12px 16px;
  background: var(--navy-deep);
  color: #e6edf6;
  font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  font-size: 15px;
  line-height: 1.6;
  overflow-x: auto;
  border-left: 4px solid var(--orange);
}
.install p { font-size: 16.5px; }
.install p code { font-family: ui-monospace, "SF Mono", Menlo, Consolas, monospace; font-size: 0.86em; background: var(--panel); padding: 1px 5px; overflow-wrap: anywhere; }

/* ---------- people and contact ---------- */

.person { display: grid; grid-template-columns: 150px minmax(0, 1fr); gap: 30px; align-items: start; }
.person img { width: 150px; height: 152px; object-fit: cover; display: block; filter: grayscale(0.15); }
.person h3 { margin: 0; font-size: 38px; }
.person .role { margin: 6px 0 12px; color: var(--orange-ink); font-weight: 600; }
.person p { margin: 0 0 12px; color: var(--ink-2); max-width: 38em; }

.contact p.big a { color: var(--orange-ink); }

/* ---------- footer ---------- */

footer.site { background: var(--navy); color: var(--on-navy-2); padding: 42px 0 46px; font-size: 16px; }
footer.site .wrap { display: grid; grid-template-columns: minmax(0, 1fr) auto; gap: 18px 40px; align-items: end; }
footer.site .name { color: var(--on-navy); font-size: 40px; margin: 0; }
footer.site .name .deva { font-size: 22px; color: var(--orange); display: block; margin-top: 8px; text-transform: none; letter-spacing: 0; font-weight: 600; }
footer.site p { margin: 6px 0 0; }
footer.site a { color: var(--on-navy); }
footer.site .legal { grid-column: 1 / -1; font-size: 14px; border-top: 1px solid rgba(255, 255, 255, 0.16); padding-top: 16px; margin-top: 10px; }

/* ---------- small screens ---------- */

@media (max-width: 900px) {
  .hero { grid-template-columns: 1fr; gap: 40px; padding-top: 48px; padding-bottom: 64px; }
  .row { grid-template-columns: 1fr; gap: 22px; padding-bottom: 64px; }
  .row h2 { font-size: 44px; }
  .rules { grid-template-columns: 1fr; }
  .nav { display: none; }
}
@media (max-width: 640px) {
  body { font-size: 18px; }
  .wrap { padding: 0 16px; }
  .hero .lede { font-size: 20px; }
  .dialogue { padding: 20px 18px 18px; }
  .stats { grid-template-columns: 1fr; }
  .stat + .stat { padding-left: 0; border-left: 0; border-top: 1px solid var(--hair); }
  .stat .n { font-size: 80px; }
  .ladder { grid-template-columns: 1fr; }
  .ladder .rungs { flex-direction: row-reverse; flex-wrap: wrap; }
  .ladder .rungs li { flex: 1 1 40%; }
  .ladder .stage { padding: 20px 16px 22px; min-height: 0; }
  .ladder .turns li { grid-template-columns: 1fr; gap: 2px; }
  .facts { grid-template-columns: 1fr; }
  .facts div:nth-child(2n) { padding-left: 0; border-left: 0; }
  .update { grid-template-columns: 1fr; gap: 10px; }
  .update time .d { display: inline; font-size: 40px; }
  .update time .my { display: inline; margin-left: 8px; }
  .update h3 { font-size: 30px; }
  .plugin, .person { grid-template-columns: 1fr; }
  .claude-badge { grid-template-columns: 32px auto; }
  .claude-badge svg { width: 32px; height: 32px; }
  footer.site .wrap { grid-template-columns: 1fr; }
}