/* ─── Strata — strataexploration.com ────────────────────────────────
   Tokens copied verbatim from the Strata design system
   (design_handoff_stratascan/_ds/.../tokens/*.css).
   Light surface only — the brand has no dark variant. */

:root {
  /* base neutrals */
  --paper: #F3F0E9;
  --paper-raised: #FBF9F4;
  --paper-sunken: #EAE5D9;
  --ink: #2A2118;
  --ink-2: #574A3B;
  --ink-3: #8A7B65;
  --line: #DAD3C4;
  --line-strong: #B9AE99;

  /* strata scale — a core sample, surface to bedrock */
  --strata-silt:   #EDE3D9;
  --strata-sand:   #E3CEBD;
  --strata-clay:   #D7B39B;
  --strata-ochre:  #C08B5C;
  --strata-copper: #A6572B;
  --strata-iron:   #77391E;
  --strata-basalt: #3C2F23;

  /* accent */
  --accent: var(--strata-copper);
  --accent-strong: #8C4721;
  --accent-soft: #EFDCCB;
  --text-on-accent: #FBF6EF;

  /* type */
  --font-display: 'Archivo Black', 'Archivo', sans-serif;
  --font-body: 'Archivo', system-ui, sans-serif;
  --font-mono: 'IBM Plex Mono', ui-monospace, monospace;

  --text-2xs: 11px;
  --text-xs: 12px;
  --text-sm: 13px;
  --text-md: 15px;
  --text-lg: 18px;
  --text-xl: 24px;
  --text-2xl: 32px;
  --text-3xl: 44px;
  --text-4xl: 64px;

  --display-tracking: -0.01em;
  --display-leading: 0.98;
  --label-tracking: 0.14em;
  --body-leading: 1.55;

  /* motion */
  --ease: cubic-bezier(0.2, 0, 0, 1);
}

*, *::before, *::after { box-sizing: border-box; }

html {
  color-scheme: light;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

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

body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: var(--text-md);
  line-height: var(--body-leading);
  -webkit-font-smoothing: antialiased;
}

img { max-width: 100%; height: auto; display: block; }

a { color: var(--accent); }
a:hover { color: var(--accent-strong); }

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  border-radius: 2px;
}

.container {
  width: 100%;
  max-width: 1200px;
  margin-inline: auto;
  padding-inline: 28px;
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  background: var(--ink);
  color: var(--paper);
  padding: 12px 16px;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  text-transform: uppercase;
  letter-spacing: var(--label-tracking);
  text-decoration: none;
  z-index: 100;
}
.skip-link:focus { left: 8px; top: 8px; }

/* ─── Nav ─────────────────────────────────────────────────────────── */

.nav {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(243, 240, 233, 0.88);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
}

.nav__inner {
  max-width: 1200px;
  margin-inline: auto;
  padding: 16px 28px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.nav__mark {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  text-transform: uppercase;
  letter-spacing: var(--display-tracking);
  color: var(--ink);
  text-decoration: none;
}

.nav__links {
  display: flex;
  gap: 24px;
}

.nav__links a {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: var(--label-tracking);
  color: var(--ink-2);
  text-decoration: none;
  transition: color 120ms var(--ease);
}
.nav__links a:hover { color: var(--accent); }

/* ─── Hero ────────────────────────────────────────────────────────── */

.hero {
  padding-block: 56px 48px;
}

.hero__lockup {
  width: 100%;
  max-width: 400px;
  margin: 0 0 40px;
}

.hero__title {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  line-height: var(--display-leading);
  letter-spacing: var(--display-tracking);
  text-transform: uppercase;
  overflow-wrap: break-word;
  margin: 0 0 24px;
}

.hero__lede {
  font-size: var(--text-lg);
  color: var(--ink-2);
  max-width: 62ch;
  margin: 0;
}

/* ─── Core-sample band ────────────────────────────────────────────── */

.core-sample {
  display: flex;
  width: 100%;
  height: 8px;
}
.core-sample span { flex: 1; }

/* ─── Sections ────────────────────────────────────────────────────── */

.section { padding-block: 64px; }

.section--inset {
  background: var(--paper-sunken);
  border-block: 1px solid var(--line);
}

.label {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: var(--label-tracking);
  color: var(--ink-3);
  margin: 0 0 32px;
}

/* ─── Cards ───────────────────────────────────────────────────────── */

.cards {
  display: grid;
  gap: 16px;
}

.card {
  background: var(--paper-raised);
  border: 1px solid var(--line);
  border-radius: 4px;
  padding: 28px 24px;
}

.card__label {
  font-family: var(--font-mono);
  font-size: var(--text-2xs);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: var(--label-tracking);
  color: var(--accent);
  margin: 0 0 20px;
}

.card__title {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  overflow-wrap: break-word;
  line-height: var(--display-leading);
  letter-spacing: var(--display-tracking);
  text-transform: uppercase;
  margin: 0 0 12px;
}

.card__body {
  font-size: var(--text-md);
  color: var(--ink-2);
  margin: 0;
}

/* ─── Contact ─────────────────────────────────────────────────────── */

.contact__title {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  overflow-wrap: break-word;
  line-height: var(--display-leading);
  letter-spacing: var(--display-tracking);
  text-transform: uppercase;
  margin: 0 0 16px;
}

.contact__body {
  font-size: var(--text-lg);
  color: var(--ink-2);
  max-width: 56ch;
  margin: 0 0 28px;
}

.contact__email { margin: 0; }

.contact__email a {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: var(--text-md);
  font-weight: 500;
  color: var(--accent);
  text-decoration: none;
  border-bottom: 2px solid var(--accent-soft);
  padding-bottom: 2px;
  transition: border-color 120ms var(--ease), color 120ms var(--ease);
}
.contact__email a:hover {
  color: var(--accent-strong);
  border-bottom-color: var(--accent);
}

/* ─── Footer ──────────────────────────────────────────────────────── */

.footer {
  background: var(--ink);
  color: var(--paper);
  padding-block: 40px;
}

.footer__inner {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.footer__name {
  font-family: var(--font-body);
  font-size: var(--text-md);
  font-weight: 600;
  color: var(--paper);
  margin: 0 0 6px;
}

.footer__note,
.footer__meta p {
  font-size: var(--text-sm);
  color: var(--ink-3);
  margin: 0;
}

.footer__meta p + p { margin-top: 6px; }

.footer__meta a {
  font-family: var(--font-mono);
  color: var(--strata-clay);
  text-decoration: none;
}
.footer__meta a:hover { color: var(--strata-sand); }

.footer :focus-visible { outline-color: var(--strata-clay); }

/* ─── Desktop ─────────────────────────────────────────────────────── */

@media (min-width: 768px) {
  .container { padding-inline: 32px; }
  .nav__inner { padding-inline: 32px; }

  .hero { padding-block: 96px 80px; }
  .hero__lockup { max-width: 460px; margin-bottom: 48px; }
  .hero__title { font-size: var(--text-4xl); max-width: 14ch; }

  .section { padding-block: 96px; }

  .cards {
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
  }
  .card { padding: 32px 28px; }
  /* two-line floor so card bodies share a baseline when a title wraps */
  .card__title { font-size: var(--text-xl); min-height: calc(var(--display-leading) * 2em); }

  .contact__title { font-size: var(--text-3xl); }

  .footer__inner {
    flex-direction: row;
    justify-content: space-between;
    align-items: flex-end;
  }
  .footer__meta { text-align: right; }
}