/* styles.css — shared design system for EmilyAI sub-pages.
   The homepage (EmilyAI.html) keeps its own inline copy of these tokens
   because it has unique hero / waterfall layouts. */

:root {
  --bg:        oklch(0.155 0.025 232);
  --bg-2:      oklch(0.185 0.028 230);
  --bg-3:      oklch(0.215 0.030 228);
  --ink:       oklch(0.96 0.008 230);
  --ink-dim:   oklch(0.74 0.020 228);
  --ink-mute:  oklch(0.56 0.022 228);
  --rule:      oklch(0.36 0.020 230 / 0.55);
  --rule-soft: oklch(0.36 0.020 230 / 0.25);
  --amber:     oklch(0.56 0.135 35);
  --amber-2:   oklch(0.46 0.130 28);
  --teal:      oklch(0.78 0.080 205);

  --serif:     "Lexend", system-ui, sans-serif;
  --sans:      "Lexend", system-ui, sans-serif;
  --mono:      "JetBrains Mono", ui-monospace, monospace;
  --display-tracking: -0.04em;
  --display-weight:   300;
  --h2-tracking:      -0.035em;

  --pad:       clamp(20px, 4vw, 56px);
  --maxw:      1320px;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  font-weight: 300;
  font-size: 16px;
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
  text-wrap: pretty;
}
::selection { background: var(--amber); color: #1a1a1a; }
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }

/* ─── Type ────────────────────────────────────────────── */
.display {
  font-family: var(--serif);
  font-weight: var(--display-weight);
  line-height: 0.98;
  letter-spacing: var(--display-tracking);
  font-size: clamp(48px, 7vw, 112px);
  margin: 0;
}
.display i, .display em {
  font-style: italic; color: var(--amber); font-weight: 300;
}

.h2 {
  font-family: var(--serif);
  font-weight: 300;
  font-size: clamp(36px, 4.5vw, 64px);
  line-height: 1.04;
  letter-spacing: var(--h2-tracking);
  margin: 0;
}
.h2 i, .h2 em { font-style: italic; color: var(--amber); font-weight: 300; }

.h3 {
  font-family: var(--serif);
  font-weight: 300;
  font-size: clamp(24px, 2.4vw, 32px);
  line-height: 1.1;
  margin: 0;
  letter-spacing: -0.025em;
}
.h3 i { font-style: italic; color: var(--amber); }

.eyebrow {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--ink-dim);
  font-weight: 400;
}
.eyebrow .dot {
  width: 6px; height: 6px;
  background: var(--amber);
  border-radius: 50%;
  display: inline-block;
  vertical-align: middle;
  margin-right: 8px;
  transform: translateY(-1px);
}
.lede {
  font-family: var(--serif);
  font-size: clamp(20px, 1.8vw, 26px);
  line-height: 1.35;
  color: var(--ink-dim);
  max-width: 60ch;
  font-weight: 300;
}
.lede i { color: var(--ink); font-style: italic; }
.body-lg {
  font-size: clamp(15px, 1.05vw, 17px);
  line-height: 1.65;
  color: var(--ink-dim);
  max-width: 64ch;
  font-weight: 300;
}
.body-lg strong { color: var(--ink); font-weight: 500; }
.mono { font-family: var(--mono); }
.mono-tag {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--ink-mute);
}

/* ─── Layout ──────────────────────────────────────────── */
.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 var(--pad); }
section { position: relative; }
/* Trailing breathing room so the end of each section's content
   doesn't sit flush against the next section's divider. */
section { padding-bottom: clamp(40px, 6vw, 88px); }
.page-hero { padding-bottom: clamp(48px, 7vw, 96px); }

.section-head {
  display: grid;
  grid-template-columns: 1fr 2.2fr;
  gap: clamp(24px, 5vw, 80px);
  padding-top: clamp(60px, 9vw, 140px);
  padding-bottom: clamp(32px, 5vw, 64px);
  align-items: start;
}
.section-head .meta {
  border-top: 1px solid var(--rule);
  padding-top: 18px;
  display: flex; flex-direction: column; gap: 14px;
}
.section-head .meta .num {
  font-family: var(--mono); font-size: 11px;
  letter-spacing: 0.18em; color: var(--amber);
}
.section-head .meta .title {
  font-family: var(--mono); font-size: 11px;
  letter-spacing: 0.18em; text-transform: uppercase; color: var(--ink-dim);
}
.section-head .body { padding-top: 18px; }
@media (max-width: 760px) {
  .section-head { grid-template-columns: 1fr; gap: 12px; }
}

/* ─── Nav ─────────────────────────────────────────────── */
.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 50;
  padding: 18px var(--pad);
  display: flex;
  align-items: center;
  justify-content: space-between;
  transition: background 280ms ease, backdrop-filter 280ms ease, border-color 280ms ease;
  border-bottom: 1px solid transparent;
}
.nav.scrolled,
.nav.solid {
  background: oklch(0.155 0.025 232 / 0.78);
  backdrop-filter: saturate(140%) blur(14px);
  -webkit-backdrop-filter: saturate(140%) blur(14px);
  border-bottom-color: var(--rule-soft);
}
.brand { display: flex; align-items: center; gap: 12px; }
.brand .mark {
  width: 22px; height: 22px;
  border-radius: 50%;
  background: radial-gradient(circle at 32% 30%, var(--amber) 0%, var(--amber-2) 45%, oklch(0.30 0.06 30) 100%);
  box-shadow: 0 0 0 1px oklch(0.40 0.04 30 / 0.5) inset, 0 0 16px oklch(0.58 0.225 28 / 0.45);
}
.brand .name {
  font-family: "Lexend", sans-serif;
  font-weight: 500;
  font-size: 17px;
  letter-spacing: -0.025em;
  color: var(--ink);
  line-height: 1;
}
.brand .name i { font-style: italic; color: var(--amber); font-weight: 300; }
.nav-links {
  display: flex; align-items: center; gap: 28px;
  font-family: var(--mono); font-size: 12px;
  letter-spacing: 0.10em; text-transform: uppercase; color: var(--ink-dim);
}
.nav-links a:hover { color: var(--ink); }
.nav-links .cta {
  padding: 10px 16px;
  border: 1px solid var(--rule);
  color: var(--ink);
  transition: background 180ms, border-color 180ms;
}
.nav-links .cta:hover { background: var(--ink); color: var(--bg); border-color: var(--ink); }
.nav-links a.current { color: var(--ink); }
.nav-links a.current::after { content: ""; display: inline-block; width: 5px; height: 5px; border-radius: 50%; background: var(--amber); margin-left: 8px; transform: translateY(-2px); }
@media (max-width: 880px) { .nav-links a:not(.cta) { display: none; } }

/* ─── Sub-page hero (compact) ─────────────────────────── */
.page-hero {
  padding: clamp(120px, 18vh, 200px) 0 clamp(48px, 7vw, 96px);
  border-bottom: 1px solid var(--rule);
}
.page-hero-grid {
  display: grid;
  grid-template-columns: 1fr 2.2fr;
  gap: clamp(24px, 5vw, 80px);
  align-items: start;
}
.page-hero-grid .meta {
  border-top: 1px solid var(--rule);
  padding-top: 18px;
  display: grid; gap: 14px;
}
.page-hero-grid .meta .num { font-family: var(--mono); font-size: 11px; letter-spacing: 0.18em; color: var(--amber); }
.page-hero-grid .meta .title { font-family: var(--mono); font-size: 11px; letter-spacing: 0.18em; text-transform: uppercase; color: var(--ink-dim); }
.page-hero-grid .body { padding-top: 18px; display: grid; gap: 24px; }
@media (max-width: 760px) { .page-hero-grid { grid-template-columns: 1fr; gap: 14px; } }

/* ─── Buttons / pills ─────────────────────────────────── */
.btn-pill {
  display: inline-flex; align-items: center; gap: 12px;
  padding: 14px 22px;
  border: 1px solid var(--ink);
  background: transparent;
  color: var(--ink);
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  cursor: pointer;
  transition: background 180ms, color 180ms, border-color 180ms, transform 180ms;
}
.btn-pill:hover { background: var(--amber); color: var(--bg); border-color: var(--amber); }
.btn-pill.solid { background: var(--ink); color: var(--bg); border-color: var(--ink); }
.btn-pill.solid:hover { background: var(--amber); border-color: var(--amber); color: var(--bg); }
.btn-pill .arrow { width: 14px; height: 1px; background: currentColor; position: relative; }
.btn-pill .arrow::after {
  content: ""; position: absolute; right: 0; top: 50%;
  width: 6px; height: 6px; border-top: 1px solid currentColor; border-right: 1px solid currentColor;
  transform: translate(0, -50%) rotate(45deg);
}

/* ─── Footer ──────────────────────────────────────────── */
footer {
  border-top: 1px solid var(--rule-soft);
  padding: clamp(40px, 5vw, 64px) 0 24px;
  margin-top: clamp(80px, 12vw, 160px);
}
.foot {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: clamp(24px, 4vw, 56px);
  margin-bottom: 56px;
}
.foot .col h5 { font-family: var(--mono); font-size: 10px; letter-spacing: 0.18em; text-transform: uppercase; color: var(--ink-mute); margin: 0 0 16px; font-weight: 400; }
.foot .col ul { list-style: none; margin: 0; padding: 0; display: grid; gap: 10px; font-size: 13.5px; color: var(--ink-dim); }
.foot .col ul a:hover { color: var(--ink); }
.foot-brand .word {
  font-family: var(--serif);
  font-weight: 300;
  font-size: clamp(36px, 4vw, 56px);
  line-height: 0.98;
  letter-spacing: var(--display-tracking);
  margin-bottom: 18px;
}
.foot-brand .word i { font-style: italic; color: var(--amber); }
.foot-brand p { font-size: 13px; color: var(--ink-mute); max-width: 40ch; line-height: 1.5; margin: 0; }
.foot-rule { border-top: 1px solid var(--rule-soft); padding-top: 22px; display: flex; justify-content: space-between; gap: 24px; font-family: var(--mono); font-size: 11px; letter-spacing: 0.10em; color: var(--ink-mute); flex-wrap: wrap; }
@media (max-width: 760px) { .foot { grid-template-columns: 1fr 1fr; } .foot-brand { grid-column: 1 / -1; } }

/* ─── Reveal ──────────────────────────────────────────── */
[data-reveal] {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 700ms ease, transform 700ms cubic-bezier(.2,.7,.2,1);
}
[data-reveal].in { opacity: 1; transform: translateY(0); }

.rule { height: 1px; background: var(--rule-soft); border: 0; margin: 0; }