/* Cairn marketing site. Tokens copied from packages/ui/src/tokens.ts (step 24) — tokens are
   data; this site never imports app code. Light mode canonical, WCAG 2.2 AA. */

/* ---------- tokens ---------- */
:root {
  /* cairn green (brand) */
  --cairn-0: #E6F2EE; --cairn-1: #CCE5DD; --cairn-2: #A3D1C2; --cairn-3: #77BBA5;
  --cairn-4: #52A78B; --cairn-5: #338F73; --cairn-6: #1F7A5F; --cairn-7: #1A6B54;
  --cairn-8: #14543F; --cairn-9: #0E3D2E;
  /* slate neutrals */
  --gray-0: #F8FAFC; --gray-1: #F1F5F9; --gray-2: #E2E8F0; --gray-3: #CBD5E1;
  --gray-4: #94A3B8; --gray-5: #64748B; --gray-6: #475569; --gray-7: #334155;
  --gray-8: #1E293B; --gray-9: #0F172A;

  --bg: #ffffff;
  --navy: #0E2244;      /* dark navy for alternating sections (Founder Review #2) */
  --navy-line: rgb(255 255 255 / 0.14);
  --ink: var(--gray-8);
  --ink-strong: var(--gray-9);
  --ink-soft: var(--gray-6);
  --line: var(--gray-2);
  --brand: var(--cairn-7);
  --brand-strong: var(--cairn-8);
  --brand-soft: var(--cairn-0);

  --radius-sm: 4px; --radius-md: 6px; --radius-lg: 8px; --radius-xl: 12px;
  --font-sans: 'Inter Variable', 'Segoe UI', system-ui, -apple-system, sans-serif;
  --shadow-1: 0 1px 2px rgb(15 23 42 / 0.06), 0 1px 3px rgb(15 23 42 / 0.08);
  --shadow-2: 0 4px 16px rgb(15 23 42 / 0.08);
  --container: 1080px;
}

@font-face {
  font-family: 'Inter Variable';
  font-style: normal;
  font-weight: 100 900;
  font-display: swap;
  src: url('/assets/fonts/inter-latin-wght-normal.woff2') format('woff2-variations');
}

/* ---------- base ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; }
@media (prefers-reduced-motion: reduce) { html { scroll-behavior: auto; } }
body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 1rem;
  line-height: 1.6;
  color: var(--ink);
  background: var(--bg);
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
h1, h2, h3, h4 { color: var(--ink-strong); line-height: 1.2; font-weight: 650; margin: 0 0 0.5em; letter-spacing: -0.015em; }
h1 { font-size: clamp(2rem, 4.5vw, 3rem); }
h2 { font-size: clamp(1.4rem, 2.6vw, 1.9rem); }
h3 { font-size: 1.15rem; }
p { margin: 0 0 1em; }
a { color: var(--brand); text-decoration-thickness: 1px; text-underline-offset: 2px; }
a:hover { color: var(--brand-strong); }
img { max-width: 100%; height: auto; display: block; border-radius: var(--radius-lg); }
.container { max-width: var(--container); margin-inline: auto; padding-inline: 20px; }
.skip-link {
  position: absolute; left: -9999px; top: 0; z-index: 100;
  background: var(--brand); color: #fff; padding: 8px 16px; border-radius: 0 0 var(--radius-md) 0;
}
.skip-link:focus { left: 0; }
:focus-visible { outline: 2px solid var(--brand); outline-offset: 2px; }

/* ---------- header ---------- */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: rgb(255 255 255 / 0.86);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}
.header-inner { display: flex; align-items: center; gap: 24px; min-height: 45px; }
.brand { display: flex; align-items: center; gap: 9px; text-decoration: none; color: var(--brand); }
.brand-mark { width: 26px; height: 26px; }
.brand-name { font-weight: 700; font-size: 1.15rem; color: var(--ink-strong); letter-spacing: -0.01em; }
.brand-suffix { font-weight: 450; color: var(--ink-soft); }
.site-nav { display: flex; align-items: center; gap: 4px; margin-left: auto; }
.site-nav a:not(.btn) {
  color: var(--ink); text-decoration: none; font-size: 0.92rem; font-weight: 480;
  padding: 6px 10px; border-radius: var(--radius-md);
}
.site-nav a:not(.btn):hover { background: var(--gray-1); color: var(--ink-strong); }
.site-nav a[aria-current="page"] { color: var(--brand-strong); font-weight: 600; }
.nav-cta { margin-left: 8px; }
.nav-toggle { display: none; }

@media (max-width: 900px) {
  .nav-toggle {
    display: inline-flex; flex-direction: column; gap: 4px; margin-left: auto;
    background: none; border: 1px solid var(--line); border-radius: var(--radius-md);
    padding: 9px 8px; cursor: pointer;
  }
  .nav-toggle-bar { width: 18px; height: 2px; background: var(--ink-strong); border-radius: 1px; }
  .site-nav {
    display: none; position: absolute; top: 45px; left: 0; right: 0;
    flex-direction: column; align-items: stretch; gap: 2px;
    background: #fff; border-bottom: 1px solid var(--line); padding: 12px 20px 16px;
    box-shadow: var(--shadow-2);
  }
  .site-nav.open { display: flex; }
  .nav-cta { margin: 8px 0 0; text-align: center; }
  /* no-JS fallback: keep nav reachable */
  .no-js .site-nav { display: flex; position: static; box-shadow: none; }
  .no-js .nav-toggle { display: none; }
}

/* ---------- buttons ---------- */
.btn {
  display: inline-block; font-weight: 600; font-size: 0.95rem; text-decoration: none;
  border-radius: var(--radius-md); padding: 10px 18px; border: 1px solid transparent;
  cursor: pointer; transition: background-color 120ms ease, border-color 120ms ease;
}
.btn-primary { background: var(--brand); color: #fff; }
.btn-primary:hover { background: var(--brand-strong); color: #fff; }
.btn-secondary { background: #fff; color: var(--ink-strong); border-color: var(--gray-3); }
.btn-secondary:hover { border-color: var(--gray-5); background: var(--gray-0); }
.btn-lg { padding: 13px 26px; font-size: 1.05rem; border-radius: var(--radius-lg); }

/* ---------- sections ---------- */
.section { padding-block: 56px; }
.section-tight { padding-block: 36px; }
/* Sections alternate white / dark navy (Founder Review #2). */
.section-alt, .section-dark { background: var(--navy); color: var(--gray-2); }
.section-alt h1, .section-alt h2, .section-alt h3,
.section-dark h1, .section-dark h2, .section-dark h3 { color: #fff; }
.section-alt .kicker, .section-dark .kicker { color: var(--cairn-3); }
.section-alt .lede, .section-dark .lede { color: var(--gray-3); }
.section-alt .fineprint, .section-alt .quiet,
.section-dark .fineprint, .section-dark .quiet { color: var(--gray-4); }
.section-alt a:not(.btn), .section-dark a:not(.btn) { color: var(--cairn-2); }
.section-alt .checklist li::before, .section-dark .checklist li::before { color: var(--cairn-3); }
/* Cards stay light and keep their own ink, even on navy. */
.card { color: var(--ink); }
.card h3 { color: var(--ink-strong); }
.card a:not(.btn) { color: var(--brand); }
.kicker {
  display: inline-block; font-size: 0.8rem; font-weight: 650; letter-spacing: 0.08em;
  text-transform: uppercase; color: var(--brand); margin-bottom: 10px;
}
.lede { font-size: 1.15rem; color: var(--ink-soft); max-width: 46rem; }
.center { text-align: center; }
.center .lede { margin-inline: auto; }

/* ---------- hero ---------- */
.hero { padding-block: 64px 48px; position: relative; overflow: hidden; }
.hero-grid { display: grid; grid-template-columns: 1.05fr 0.95fr; gap: 48px; align-items: center; }
.hero h1 { margin-bottom: 0.4em; }
.hero-sub { font-size: 1.2rem; color: var(--ink-soft); max-width: 34rem; }
.hero-ctas { display: flex; gap: 12px; flex-wrap: wrap; margin-top: 28px; }
.hero-note { font-size: 0.88rem; color: var(--ink-soft); margin-top: 14px; }
.hero-art img { box-shadow: var(--shadow-2); border: 1px solid var(--line); }
@media (max-width: 820px) { .hero-grid { grid-template-columns: 1fr; } }

/* ---------- cards / grids ---------- */
.grid { display: grid; gap: 20px; }
.grid-2 { grid-template-columns: repeat(2, 1fr); }
.grid-3 { grid-template-columns: repeat(3, 1fr); }
@media (max-width: 900px) { .grid-3 { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 620px) { .grid-2, .grid-3 { grid-template-columns: 1fr; } }
.card {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius-xl);
  padding: 24px; box-shadow: var(--shadow-1);
}
.card h3 { margin-top: 2px; }
.card p:last-child { margin-bottom: 0; }
.card-icon {
  width: 38px; height: 38px; border-radius: var(--radius-lg); display: grid; place-items: center;
  background: var(--brand-soft); color: var(--brand); margin-bottom: 14px;
}
.card-icon svg { width: 20px; height: 20px; }

/* hover-flip feature cards (Founder Review #2): title over a quiet generated
   background on the front; explanation on the back. Hover/focus flips; JS adds
   .flipped on tap for touch. */
.flip { perspective: 1100px; min-height: 232px; position: relative; }
.flip-inner {
  position: relative; width: 100%; height: 100%; min-height: inherit;
  transition: transform 480ms cubic-bezier(0.2, 0.7, 0.3, 1); transform-style: preserve-3d;
}
.flip:hover .flip-inner, .flip:focus-visible .flip-inner, .flip.flipped .flip-inner { transform: rotateY(180deg); }
.flip-front, .flip-back {
  position: absolute; inset: 0; backface-visibility: hidden; -webkit-backface-visibility: hidden;
  border: 1px solid var(--line); border-radius: var(--radius-xl); box-shadow: var(--shadow-1); padding: 20px;
}
.flip-front {
  display: flex; align-items: flex-end;
  background-color: var(--cairn-0); background-size: cover; background-position: center;
}
.flip-front h3 {
  margin: 0; font-size: 1.15rem; color: var(--ink-strong); /* beats .section-alt h3 on navy */
  background: rgb(255 255 255 / 0.85); padding: 7px 12px; border-radius: var(--radius-lg);
}
.flip-front::after {
  content: "\21BB"; position: absolute; top: 12px; right: 14px;
  color: var(--cairn-7); background: rgb(255 255 255 / 0.85); border-radius: 50%;
  width: 26px; height: 26px; display: grid; place-items: center; font-size: 0.95rem;
}
.flip-back {
  transform: rotateY(180deg); background: #fff; color: var(--ink);
  display: flex; flex-direction: column; justify-content: center; overflow: auto;
  font-size: 0.92rem; line-height: 1.5;
}
.flip-back h3 { font-size: 1rem; margin-bottom: 0.4em; }
.flip-back p { margin: 0; }
@media (prefers-reduced-motion: reduce) { .flip-inner { transition: none; } }
/* no-JS / print fallback: show both faces stacked */
.no-js .flip { min-height: 0; }
.no-js .flip-inner { transform: none !important; }
.no-js .flip-front, .no-js .flip-back { position: static; transform: none; backface-visibility: visible; margin-bottom: 8px; }

/* pain/answer pairs */
.pain { border-left: 3px solid var(--gray-3); }
.pain .pain-quote { color: var(--ink-strong); font-weight: 600; font-size: 1.05rem; }
.pain .answer { border-top: 1px dashed var(--line); margin-top: 14px; padding-top: 14px; }
.pain .answer strong { color: var(--brand-strong); }

/* ---------- tables ---------- */
.table-wrap { overflow-x: auto; border: 1px solid var(--line); border-radius: var(--radius-xl); box-shadow: var(--shadow-1); }
table { border-collapse: collapse; width: 100%; font-size: 0.92rem; background: #fff; }
th, td { text-align: left; padding: 12px 14px; border-bottom: 1px solid var(--line); vertical-align: top; }
thead th { background: var(--gray-0); font-size: 0.82rem; text-transform: uppercase; letter-spacing: 0.04em; color: var(--ink-soft); }
tbody tr:last-child td { border-bottom: none; }
td.good { color: var(--brand-strong); font-weight: 600; }
.col-cairn { background: var(--brand-soft); }
.fineprint { font-size: 0.82rem; color: var(--ink-soft); }

/* ---------- pricing (one plan table, Founder Review #2) ---------- */
.tier-table th, .tier-table td { text-align: center; padding: 10px 12px; }
.tier-table tbody th[scope="row"] { text-align: left; font-weight: 600; font-size: 0.88rem; color: var(--ink-strong); max-width: 220px; }
.tier-table thead th { font-size: 0.95rem; text-transform: none; letter-spacing: 0; color: var(--ink-strong); font-weight: 700; }
.tier-table .col-featured { background: var(--brand-soft); }
.tier-table thead .col-featured { border-top: 3px solid var(--cairn-5); }
.flag-inline {
  display: block; margin: 4px auto 0; width: fit-content; background: var(--brand); color: #fff;
  font-size: 0.68rem; font-weight: 650; letter-spacing: 0.05em; text-transform: uppercase;
  padding: 2px 9px; border-radius: 999px;
}
.tier-note { display: block; font-size: 0.76rem; font-weight: 480; color: var(--ink-soft); }
.tt-price { display: block; font-size: 1.5rem; font-weight: 750; color: var(--ink-strong); letter-spacing: -0.02em; }
.cell-note { display: block; font-size: 0.8rem; color: var(--ink-soft); }
.mark-yes { color: var(--cairn-6); font-weight: 700; font-size: 1.05rem; }
.mark-no { color: var(--gray-4); font-weight: 700; font-size: 1.05rem; }
.tt-cta td { padding-block: 14px; }
.tt-cta .btn { padding: 8px 12px; font-size: 0.85rem; }
.sr-only {
  position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(0 0 0 0); white-space: nowrap; border: 0;
}

/* calculator */
.calc { display: grid; grid-template-columns: 1fr 1fr; gap: 32px; align-items: start; }
@media (max-width: 820px) { .calc { grid-template-columns: 1fr; } }
.calc-controls { display: grid; gap: 18px; }
.calc-controls label { font-weight: 600; font-size: 0.92rem; color: var(--ink-strong); display: block; margin-bottom: 6px; }
.calc-row output { font-weight: 700; color: var(--brand-strong); font-variant-numeric: tabular-nums; }
input[type="range"] { width: 100%; accent-color: var(--brand); }
.calc-result .big { font-size: 2.6rem; font-weight: 750; color: var(--ink-strong); letter-spacing: -0.02em; font-variant-numeric: tabular-nums; }
.calc-result .big small { font-size: 1rem; font-weight: 480; color: var(--ink-soft); }
.calc-line { display: flex; justify-content: space-between; gap: 12px; padding: 8px 0; border-bottom: 1px dashed var(--line); font-size: 0.94rem; font-variant-numeric: tabular-nums; }
.calc-vs { margin-top: 18px; padding: 14px 16px; background: var(--gray-0); border: 1px solid var(--line); border-radius: var(--radius-lg); font-size: 0.92rem; }
.calc-vs strong { font-variant-numeric: tabular-nums; }

/* ---------- product tour ---------- */
.tour { border: 1px solid var(--line); border-radius: var(--radius-xl); overflow: hidden; box-shadow: var(--shadow-1); background: #fff; color: var(--ink); }
.tour-caption strong { color: var(--ink-strong); }
.tour-stage img { border-radius: 0; border: 0; width: 100%; }
.tour-bar { display: flex; align-items: center; gap: 10px; padding: 14px 16px; border-top: 1px solid var(--line); flex-wrap: wrap; }
.tour-caption { flex: 1 1 260px; font-size: 0.94rem; margin: 0; }
.tour-caption strong { color: var(--ink-strong); }
.tour-dots { display: flex; gap: 6px; }
.tour-dot { width: 9px; height: 9px; border-radius: 50%; background: var(--gray-3); border: 0; padding: 0; cursor: pointer; }
.tour-dot[aria-current="true"] { background: var(--brand); }
.tour-btn { background: #fff; border: 1px solid var(--gray-3); border-radius: var(--radius-md); padding: 6px 12px; cursor: pointer; font-size: 0.9rem; }
.tour-btn:hover { border-color: var(--gray-5); }

/* ---------- forms ---------- */
.form-grid { display: grid; gap: 16px; max-width: 560px; }
.form-grid label { font-weight: 600; font-size: 0.92rem; color: var(--ink-strong); display: block; margin-bottom: 6px; }
.form-grid input, .form-grid select, .form-grid textarea {
  width: 100%; font: inherit; color: var(--ink-strong);
  border: 1px solid var(--gray-3); border-radius: var(--radius-md); padding: 10px 12px; background: #fff;
}
.form-grid input:focus, .form-grid select:focus, .form-grid textarea:focus { border-color: var(--brand); outline: 2px solid var(--cairn-1); }
.form-note { font-size: 0.85rem; color: var(--ink-soft); }
.form-status { font-weight: 600; }
.form-status.ok { color: var(--brand-strong); }
.form-status.err { color: #B42318; }
.hp { position: absolute; left: -9999px; }
/* inline validation (Founder Review #2: invalid input must say so, in red) */
.field-err { color: #B42318; font-size: 0.85rem; font-weight: 600; margin: 6px 0 0; }
.form-grid input.invalid, .form-grid select.invalid, .form-grid textarea.invalid { border-color: #B42318; }

/* ---------- misc ---------- */
.checklist { list-style: none; padding: 0; display: grid; gap: 10px; }
.checklist li { padding-left: 28px; position: relative; }
.checklist li::before { content: "✓"; position: absolute; left: 4px; color: var(--brand); font-weight: 700; }
.stat-row { display: flex; gap: 40px; flex-wrap: wrap; }
.stat .n { font-size: 1.9rem; font-weight: 750; color: var(--ink-strong); letter-spacing: -0.02em; }
.stat .l { font-size: 0.88rem; color: var(--ink-soft); }
.quiet { color: var(--ink-soft); }
.badge {
  display: inline-block; font-size: 0.76rem; font-weight: 650; letter-spacing: 0.04em;
  padding: 2px 9px; border-radius: 999px; background: var(--gray-1); color: var(--ink-soft);
  text-transform: uppercase;
}
.badge-green { background: var(--brand-soft); color: var(--brand-strong); }
.cta-band { text-align: center; padding-block: 64px; }
.cta-band .btn { margin-top: 8px; }
.prose { max-width: 46rem; }
.prose h2 { margin-top: 1.6em; }
hr.sep { border: 0; border-top: 1px solid var(--line); margin: 48px 0; }

/* reveal on scroll (JS adds .reveal-ready; reduced-motion users skip entirely) */
.reveal-ready .reveal { opacity: 0; transform: translateY(14px); transition: opacity 420ms ease, transform 420ms ease; }
.reveal-ready .reveal.in { opacity: 1; transform: none; }

/* feature rows (product page): bordered copy panel so text pops against screenshots */
.feature-copy {
  border: 1px solid var(--cairn-1); border-left: 4px solid var(--cairn-5);
  background: var(--gray-0); border-radius: var(--radius-xl); padding: 24px 26px;
}

/* ---------- footer ---------- */
.site-footer { background: var(--navy); color: var(--gray-3); margin-top: 56px; }
.footer-inner { display: flex; gap: 48px; padding-block: 48px 24px; flex-wrap: wrap; }
.footer-brand { flex: 1 1 280px; }
.footer-tag { font-size: 0.94rem; }
.footer-nav { display: flex; gap: 48px; flex-wrap: wrap; }
.footer-nav a { display: block; color: var(--gray-3); text-decoration: none; font-size: 0.92rem; padding: 3px 0; }
.footer-nav a:hover { color: #fff; }
.footer-h { font-size: 0.8rem; text-transform: uppercase; letter-spacing: 0.08em; color: var(--gray-4); margin-bottom: 10px; font-weight: 650; }
.footer-legal { border-top: 1px solid var(--navy-line); padding-block: 16px; font-size: 0.85rem; color: var(--gray-4); }
.footer-legal p { margin: 0; }