/* ============================================================
   Open Health Stack Foundation — Design System
   Humanist sans (Hanken Grotesk) + mono labels (IBM Plex Mono)
   Teal signature + dual pillar accents (Core / AI Commons)
   ============================================================ */

@import url('https://fonts.googleapis.com/css2?family=Hanken+Grotesk:wght@400;500;600;700;800&family=IBM+Plex+Mono:wght@400;500;600&display=swap');

:root {
  /* Neutrals — cool, faintly green-tinted ink on a warm near-white */
  --bg:        oklch(0.985 0.004 165);
  --bg-2:      oklch(0.965 0.006 175);
  --surface:   #ffffff;
  --ink:       oklch(0.245 0.018 210);
  --ink-soft:  oklch(0.46 0.018 210);
  --ink-faint: oklch(0.60 0.015 210);
  --line:      oklch(0.905 0.008 200);
  --line-soft: oklch(0.945 0.006 200);

  /* Signature indigo */
  --teal:      oklch(0.55 0.13 290);
  --teal-deep: oklch(0.42 0.11 292);
  --teal-bright: oklch(0.66 0.14 288);
  --teal-wash: oklch(0.957 0.022 290);

  /* Pillar accents — shared chroma/lightness, varied hue */
  --core:      oklch(0.58 0.105 222);   /* teal-blue   */
  --core-wash: oklch(0.955 0.022 222);
  --ai:        oklch(0.56 0.115 292);   /* indigo-violet */
  --ai-wash:   oklch(0.957 0.022 292);
  --toolkit:      oklch(0.56 0.094 200);
  --toolkit-wash: oklch(0.955 0.018 195);

  /* Project / tag hues */
  --green:     oklch(0.60 0.11 155);
  --amber:     oklch(0.70 0.115 75);
  --rose:      oklch(0.62 0.13 18);

  --maxw: 1200px;
  --gut: clamp(20px, 5vw, 64px);
  --radius: 14px;
  --radius-lg: 22px;

  --shadow-sm: 0 1px 2px oklch(0.40 0.02 210 / 0.06), 0 2px 6px oklch(0.40 0.02 210 / 0.05);
  --shadow-md: 0 4px 14px oklch(0.40 0.02 210 / 0.07), 0 12px 34px oklch(0.40 0.02 210 / 0.08);
  --shadow-lg: 0 10px 30px oklch(0.40 0.02 210 / 0.10), 0 30px 70px oklch(0.40 0.02 210 / 0.12);

  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
}

* { box-sizing: border-box; }

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

body {
  margin: 0;
  font-family: 'Hanken Grotesk', system-ui, sans-serif;
  color: var(--ink);
  background: var(--bg);
  font-size: 17px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

img { max-width: 100%; display: block; }
a { color: inherit; text-decoration: none; }

/* ---------- Typography ---------- */
h1, h2, h3, h4 {
  margin: 0;
  line-height: 1.06;
  letter-spacing: -0.02em;
  font-weight: 700;
  text-wrap: balance;
}
.display {
  font-size: clamp(2.6rem, 6vw, 4.6rem);
  font-weight: 800;
  letter-spacing: -0.035em;
  line-height: 1.0;
}
h2.section-title {
  font-size: clamp(1.9rem, 3.6vw, 3rem);
  letter-spacing: -0.03em;
}
h3 { font-size: clamp(1.25rem, 2vw, 1.6rem); }
p { margin: 0; }
.lead {
  font-size: clamp(1.12rem, 1.7vw, 1.45rem);
  line-height: 1.5;
  color: var(--ink-soft);
  font-weight: 400;
  text-wrap: pretty;
}

/* Eyebrow / mono label */
.eyebrow {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.74rem;
  font-weight: 500;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--teal-deep);
  display: inline-flex;
  align-items: center;
  gap: 0.6em;
}
.eyebrow::before {
  content: "";
  width: 22px; height: 2px;
  background: currentColor;
  opacity: 0.5;
}
.eyebrow.bare::before { display: none; }

.mono { font-family: 'IBM Plex Mono', monospace; }

/* ---------- Layout ---------- */
.wrap { max-width: var(--maxw); margin: 0 auto; padding-inline: var(--gut); }
.wrap-wide { max-width: 1360px; margin: 0 auto; padding-inline: var(--gut); }
section { position: relative; }
.section-pad { padding-block: clamp(64px, 9vw, 130px); }
.muted { color: var(--ink-soft); }

/* ---------- Buttons ---------- */
.btn {
  display: inline-flex; align-items: center; gap: 0.55em;
  font-family: inherit; font-weight: 600; font-size: 1rem;
  padding: 0.82em 1.4em;
  border-radius: 999px;
  border: 1px solid transparent;
  cursor: pointer;
  transition: transform 0.25s var(--ease), background 0.2s, box-shadow 0.25s, border-color 0.2s, color 0.2s;
  white-space: nowrap;
}
.btn:active { transform: translateY(1px); }
.btn-primary {
  background: var(--teal-deep); color: #fff;
  box-shadow: var(--shadow-sm);
}
.btn-primary:hover { background: oklch(0.37 0.078 205); transform: translateY(-2px); box-shadow: var(--shadow-md); }
.btn-ghost {
  background: transparent; color: var(--ink); border-color: var(--line);
}
.btn-ghost:hover { border-color: var(--ink); transform: translateY(-2px); background: var(--surface); }
.btn-light { background: #fff; color: var(--teal-deep); }
.btn-light:hover { transform: translateY(-2px); box-shadow: var(--shadow-md); }
.btn-on-dark { background: rgba(255,255,255,0.08); color: #fff; border-color: rgba(255,255,255,0.22); }
.btn-on-dark:hover { background: rgba(255,255,255,0.16); transform: translateY(-2px); }
.btn .arrow { transition: transform 0.25s var(--ease); }
.btn:hover .arrow { transform: translateX(3px); }

.textlink {
  display: inline-flex; align-items: center; gap: 0.4em;
  font-weight: 600; color: var(--teal-deep);
  border-bottom: 1.5px solid transparent;
  transition: gap 0.2s, border-color 0.2s;
}
.textlink:hover { gap: 0.65em; border-color: currentColor; }
.textlink .arrow { transition: transform 0.2s var(--ease); }
.textlink:hover .arrow { transform: translateX(2px); }

/* ---------- Header / Nav ---------- */
.site-header {
  position: sticky; top: 0; z-index: 100;
  background: oklch(0.985 0.004 165 / 0.82);
  backdrop-filter: saturate(1.4) blur(14px);
  -webkit-backdrop-filter: saturate(1.4) blur(14px);
  border-bottom: 1px solid transparent;
  transition: border-color 0.3s, background 0.3s;
}
.site-header.scrolled { border-color: var(--line); }
.nav {
  display: flex; align-items: center; gap: 28px;
  height: 72px;
  max-width: 1360px; margin: 0 auto; padding-inline: var(--gut);
}
.brand { display: flex; align-items: center; gap: 11px; font-weight: 700; letter-spacing: -0.02em; flex: none; }
.brand .mark { flex: none; }
.brand .brandname { font-size: 0.96rem; line-height: 1.12; white-space: nowrap; }
.brand .brandname b { display: block; font-weight: 700; }
.brand .brandname span { display: block; font-size: 0.69rem; font-weight: 500; color: var(--ink-faint); letter-spacing: 0.04em; }
.nav-links { display: flex; align-items: center; gap: 4px; margin-left: 8px; }
.nav-links a {
  font-weight: 500; font-size: 0.96rem; color: var(--ink-soft);
  padding: 8px 13px; border-radius: 9px;
  transition: color 0.18s, background 0.18s;
}
.nav-links a:hover { color: var(--ink); background: var(--bg-2); }
.nav-links a.active { color: var(--ink); font-weight: 600; }
.nav-spacer { flex: 1; }
.nav-cta { display: flex; align-items: center; gap: 10px; }
.nav-toggle { display: none; background: none; border: 1px solid var(--line); border-radius: 10px; width: 42px; height: 42px; cursor: pointer; align-items: center; justify-content: center; }
.nav-toggle svg { display: block; }

/* mobile nav panel */
.mobile-nav {
  display: none;
  position: fixed; inset: 72px 0 auto 0; z-index: 99;
  background: var(--surface); border-bottom: 1px solid var(--line);
  padding: 14px var(--gut) 26px;
  box-shadow: var(--shadow-md);
  transform: translateY(-12px); opacity: 0; pointer-events: none;
  transition: transform 0.3s var(--ease), opacity 0.3s;
}
.mobile-nav.open { transform: translateY(0); opacity: 1; pointer-events: auto; }
.mobile-nav a { display: block; padding: 13px 6px; font-size: 1.1rem; font-weight: 600; border-bottom: 1px solid var(--line-soft); }
.mobile-nav .btn { margin-top: 18px; width: 100%; justify-content: center; }

/* ---------- Brand mark (rounded-square stack — allowed simple shapes) ---------- */
.logo-mark { display: inline-grid; grid-template-columns: repeat(2, 1fr); gap: 2.5px; width: 30px; height: 30px; }
.logo-mark i { border-radius: 4px; display: block; }
.logo-mark i:nth-child(1) { background: var(--teal); }
.logo-mark i:nth-child(2) { background: var(--core); }
.logo-mark i:nth-child(3) { background: var(--ai); }
.logo-mark i:nth-child(4) { background: var(--teal-deep); }

/* ---------- Cards ---------- */
.card {
  background: var(--surface); border: 1px solid var(--line);
  border-radius: var(--radius-lg); padding: 30px;
  transition: transform 0.3s var(--ease), box-shadow 0.3s, border-color 0.3s;
}
.card.hover:hover { transform: translateY(-4px); box-shadow: var(--shadow-md); border-color: transparent; }

.tag {
  font-family: 'IBM Plex Mono', monospace;
  font-size: 0.68rem; font-weight: 500; letter-spacing: 0.1em; text-transform: uppercase;
  padding: 5px 10px; border-radius: 7px;
  background: var(--bg-2); color: var(--ink-soft);
  display: inline-flex; align-items: center; gap: 6px;
}
.tag.core    { background: var(--core-wash);    color: var(--core); }
.tag.ai      { background: var(--ai-wash);      color: var(--ai); }
.tag.toolkit { background: var(--toolkit-wash); color: var(--toolkit); }
.tag.teal    { background: var(--teal-wash);    color: var(--teal-deep); }

.icon-chip {
  width: 52px; height: 52px; border-radius: 13px;
  display: grid; place-items: center; flex: none;
  background: var(--teal-wash); color: var(--teal-deep);
}
.icon-chip.core    { background: var(--core-wash);    color: var(--core); }
.icon-chip.ai      { background: var(--ai-wash);      color: var(--ai); }
.icon-chip.toolkit { background: var(--toolkit-wash); color: var(--toolkit); }
.icon-chip svg { width: 26px; height: 26px; }

/* ---------- Reveal on scroll ---------- */
.reveal { opacity: 0; transform: translateY(22px); transition: opacity 0.7s var(--ease), transform 0.7s var(--ease); }
.reveal.in { opacity: 1; transform: none; }
.reveal.d1 { transition-delay: 0.08s; }
.reveal.d2 { transition-delay: 0.16s; }
.reveal.d3 { transition-delay: 0.24s; }
.reveal.d4 { transition-delay: 0.32s; }
@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
  html { scroll-behavior: auto; }
}

/* ---------- Footer ---------- */
.site-footer { background: var(--ink); color: oklch(0.86 0.01 200); padding-block: 72px 40px; }
.footer-grid { display: grid; grid-template-columns: 1.6fr repeat(3, 1fr); gap: 40px; }
.site-footer h4 { font-family: 'IBM Plex Mono', monospace; font-size: 0.72rem; letter-spacing: 0.14em; text-transform: uppercase; color: oklch(0.66 0.02 200); font-weight: 500; margin-bottom: 16px; }
.site-footer ul { list-style: none; margin: 0; padding: 0; display: grid; gap: 11px; }
.site-footer a { color: oklch(0.82 0.012 200); transition: color 0.18s; font-size: 0.95rem; }
.site-footer a:hover { color: #fff; }
.footer-brand .logo-mark i:nth-child(1) { background: var(--teal-bright); }
.footer-about { color: oklch(0.72 0.015 200); font-size: 0.95rem; max-width: 32ch; margin-top: 16px; }
.footer-bottom { margin-top: 56px; padding-top: 26px; border-top: 1px solid oklch(0.34 0.015 210); display: flex; flex-wrap: wrap; gap: 16px; justify-content: space-between; align-items: center; color: oklch(0.64 0.015 200); font-size: 0.85rem; }
.footer-badge { font-family: 'IBM Plex Mono', monospace; font-size: 0.72rem; letter-spacing: 0.06em; }

/* ---------- Newsletter signup (dark band, flows into the footer) ---------- */
.newsletter { background: var(--ink); padding-block: clamp(56px, 8vw, 96px) clamp(8px, 1.5vw, 18px); }
/* Standalone variant — a self-contained mid-page section (balanced padding) */
.newsletter.standalone { padding-block: clamp(56px, 8vw, 104px); }
.newsletter-inner { max-width: 600px; margin: 0 auto; text-align: center; }
.newsletter .eyebrow { justify-content: center; color: var(--teal-bright); }
.newsletter-copy h2 { color: #fff; font-size: clamp(1.7rem, 3vw, 2.35rem); letter-spacing: -0.03em; margin-top: 14px; }
.newsletter-copy p { color: oklch(0.78 0.015 200); margin: 12px auto 0; max-width: 48ch; }

/* CTA variant (pages that route to the community signup form) */
.newsletter-cta { margin-top: 28px; }

/* EmailOctopus form theming — dark surface */
.newsletter-form { margin-top: 24px; }
/* Neutralize EmailOctopus's own white card + built-in title/description so the form
   blends into our section (the section already provides heading, copy and background).
   Selectors are extra-specific to beat EmailOctopus's [data-form] .pt-5/.p-3 rules. */
.newsletter-form .nurture-container { display: block !important; background: transparent !important; border-radius: 0 !important; box-shadow: none !important; }
.newsletter-form .nurture-container .align-mid { padding: 0 !important; }
.newsletter-form .nurture-container .p-3 { padding: 0 !important; }
.newsletter-form .emailoctopus-form-wrapper { margin-top: 0 !important; }
.newsletter-form .text-block { display: none !important; }
/* Force EmailOctopus's shrink-to-fit wrappers to full width so the form can center */
.newsletter-form .nurture-container,
.newsletter-form .inline-container,
.newsletter-form .align-mid,
.newsletter-form .p-3 { width: 100% !important; max-width: 100% !important; box-sizing: border-box; }
.newsletter-form .emailoctopus-form { width: 100% !important; max-width: 440px !important; margin: 0 auto !important; display: flex; flex-direction: column; }
/* Stack fields vertically full-width (EmailOctopus defaults to a ~50% wrapping row) */
.newsletter-form [eo-form-fields-container] { display: flex; flex-direction: column; align-items: stretch; }
.newsletter-form .form-control {
  width: 100%; box-sizing: border-box; padding: 15px 18px; font-size: 1rem; font-family: inherit;
  border: 1px solid oklch(0.4 0.015 210); border-radius: var(--radius);
  background: oklch(0.31 0.018 210); color: #fff; outline: none; transition: border-color 0.2s, background 0.2s;
}
.newsletter-form .form-control::placeholder { color: oklch(0.6 0.015 200); }
.newsletter-form .form-control:focus { border-color: var(--teal-bright); }
/* Spacing between stacked fields (First name + Email) — .mb-2 isn't defined site-side */
.newsletter-form .emailoctopus-form-row { width: 100%; flex: none; margin: 0 0 16px; }
/* Field labels, if the form is configured to show them */
.newsletter-form .emailoctopus-form-row label {
  display: block; text-align: left; margin-bottom: 6px;
  font-family: 'IBM Plex Mono', monospace; font-size: 0.72rem; letter-spacing: 0.04em;
  text-transform: uppercase; color: oklch(0.78 0.015 200);
}
.newsletter-form input[type="submit"] {
  width: 100%; margin-top: 6px; padding: 15px 20px; font-size: 1rem; font-weight: 600;
  font-family: inherit; border: 0; border-radius: 999px; cursor: pointer;
  background: var(--teal-bright); color: #fff;
  transition: background 0.2s, transform 0.2s, box-shadow 0.25s;
}
.newsletter-form input[type="submit"]:hover { background: var(--teal); transform: translateY(-1px); box-shadow: var(--shadow-md); }
.newsletter-form .emailoctopus-form-row-consent { order: -1; margin: 0 0 20px; display: flex; align-items: flex-start; gap: 10px; text-align: left; }
.newsletter-form .emailoctopus-form-row-consent input { margin-top: 3px; flex: none; accent-color: var(--teal-bright); }
.newsletter-form .emailoctopus-form-row-consent label,
.newsletter-form .emailoctopus-form-row-consent { font-size: 0.8rem; color: oklch(0.75 0.015 200) !important; line-height: 1.5; }
.newsletter-form .emailoctopus-success-message, .newsletter-form .emailoctopus-error-message { color: #fff; margin-top: 12px; font-size: 0.92rem; }
.newsletter-form a { color: var(--teal-bright); }

/* Standalone (community) subscribe — light treatment */
.newsletter.standalone { background: var(--teal-wash); }
.newsletter.standalone .eyebrow { color: var(--teal-deep); }
.newsletter.standalone .newsletter-copy h2 { color: var(--ink); }
.newsletter.standalone .newsletter-copy p { color: var(--ink-soft); }
.newsletter.standalone .newsletter-form .form-control { background: rgba(255, 255, 255, 0.6); border-color: color-mix(in oklch, var(--teal-deep) 20%, var(--line)); color: var(--ink); }
.newsletter.standalone .newsletter-form .form-control::placeholder { color: var(--ink-faint); }
.newsletter.standalone .newsletter-form .form-control:focus { border-color: var(--teal-deep); background: rgba(255, 255, 255, 0.85); }
.newsletter.standalone .newsletter-form .emailoctopus-form-row label { color: var(--ink-faint); }
.newsletter.standalone .newsletter-form input[type="submit"] { background: var(--teal-deep); }
.newsletter.standalone .newsletter-form input[type="submit"]:hover { background: oklch(0.37 0.078 205); }
.newsletter.standalone .newsletter-form .emailoctopus-form-row-consent label,
.newsletter.standalone .newsletter-form .emailoctopus-form-row-consent { color: var(--ink-faint) !important; }
.newsletter.standalone .newsletter-form .emailoctopus-form-row-consent input { accent-color: var(--teal-deep); }
.newsletter.standalone .newsletter-form a { color: var(--teal-deep); }

/* ---------- Generic helpers ---------- */
.grid { display: grid; gap: 22px; }
.cols-2 { grid-template-columns: repeat(2, 1fr); }
.cols-3 { grid-template-columns: repeat(3, 1fr); }
.cols-4 { grid-template-columns: repeat(4, 1fr); }
.stack-sm > * + * { margin-top: 14px; }
.center { text-align: center; }
.section-head { max-width: 720px; }
.section-head.center { margin-inline: auto; }
.section-head .lead { margin-top: 18px; }
.divider { height: 1px; background: var(--line); border: 0; margin: 0; }

@media (max-width: 920px) {
  .cols-4 { grid-template-columns: repeat(2, 1fr); }
  .cols-3 { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 860px) {
  .nav-links { display: none; }
  .nav-toggle { display: flex; }
  .mobile-nav { display: block; }
  .nav-cta .btn:not(.nav-toggle) { display: none; }
}
@media (max-width: 620px) {
  body { font-size: 16px; }
  .cols-2 { grid-template-columns: 1fr; }
  .footer-grid { grid-template-columns: 1fr; gap: 30px; }
  .card { padding: 24px; }
}