/* Citation Compass — validation landing page
   Design intent: editorial, dense, opinionated. No template-stock hero,
   no decorative gradient blobs, no card grid with uniform padding.
   Single accent color, deliberate type scale, layered hierarchy.
*/

:root {
  /* Palette — warm off-white surface, near-black ink, one accent */
  --color-surface:        oklch(98% 0.005 80);
  --color-surface-2:      oklch(94% 0.008 80);
  --color-surface-ink:    oklch(20% 0.01 270);
  --color-ink:            oklch(18% 0.01 270);
  --color-ink-soft:       oklch(40% 0.01 270);
  --color-ink-muted:      oklch(55% 0.01 270);
  --color-rule:           oklch(88% 0.01 80);
  --color-accent:         oklch(54% 0.18 28);   /* deep terracotta */
  --color-accent-ink:     oklch(98% 0.01 80);

  /* Type — Charter / Iowan-style serif headings, system sans body */
  --font-display: ui-serif, "Iowan Old Style", "Charter", "Source Serif Pro", Georgia, serif;
  --font-body:    -apple-system, BlinkMacSystemFont, "Segoe UI", Inter, system-ui, sans-serif;

  --text-xs:    0.8125rem;
  --text-sm:    0.9375rem;
  --text-base:  clamp(1rem, 0.95rem + 0.2vw, 1.0625rem);
  --text-lg:    clamp(1.125rem, 1rem + 0.4vw, 1.25rem);
  --text-h2:    clamp(1.5rem, 1.1rem + 1.5vw, 2.25rem);
  --text-h1:    clamp(2rem, 1.2rem + 4vw, 4rem);
  --text-stat:  clamp(2.25rem, 1.4rem + 4vw, 3.75rem);

  --measure: 62ch;

  /* Spacing rhythm — not uniform; sections breathe more than blocks */
  --space-1: 0.375rem;
  --space-2: 0.75rem;
  --space-3: 1.25rem;
  --space-4: 2rem;
  --space-5: 3.25rem;
  --space-6: 5rem;
  --space-section: clamp(3.5rem, 2rem + 5vw, 7rem);

  --duration: 200ms;
  --ease: cubic-bezier(0.2, 0.8, 0.2, 1);
}

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

.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;
}

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

body {
  margin: 0;
  background: var(--color-surface);
  color: var(--color-ink);
  font-family: var(--font-body);
  font-size: var(--text-base);
  line-height: 1.55;
  -webkit-font-smoothing: antialiased;
}

a {
  color: var(--color-ink);
  text-underline-offset: 0.2em;
  text-decoration-thickness: 1px;
}
a:hover { color: var(--color-accent); }

main { display: block; }

/* ---- Header --------------------------------------------------------- */

.site-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-4);
  border-bottom: 1px solid var(--color-rule);
  position: sticky;
  top: 0;
  background: color-mix(in oklab, var(--color-surface) 92%, transparent);
  backdrop-filter: blur(8px);
  z-index: 5;
}

.wordmark {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 600;
  letter-spacing: -0.01em;
  text-decoration: none;
}
.wordmark span { color: var(--color-accent); }

.status-pill {
  margin: 0;
  font-size: var(--text-xs);
  color: var(--color-ink-soft);
  letter-spacing: 0.02em;
  text-transform: uppercase;
}
.status-pill span { color: var(--color-accent); margin-right: 0.4em; }

/* ---- Hero ----------------------------------------------------------- */

.hero {
  padding: var(--space-section) var(--space-4) var(--space-5);
  max-width: 1100px;
  margin-inline: auto;
}

.eyebrow {
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-ink-muted);
  margin: 0 0 var(--space-3);
}

.hero h1 {
  font-family: var(--font-display);
  font-size: var(--text-h1);
  line-height: 1.04;
  letter-spacing: -0.02em;
  margin: 0 0 var(--space-3);
  max-width: 22ch;
  font-weight: 600;
}
.hero h1 em {
  font-style: italic;
  color: var(--color-accent);
}

.hero-lede {
  font-size: var(--text-lg);
  color: var(--color-ink-soft);
  max-width: var(--measure);
  margin: 0 0 var(--space-4);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  margin-bottom: var(--space-3);
}

.hero-fineprint {
  font-size: var(--text-sm);
  color: var(--color-ink-muted);
  max-width: var(--measure);
  margin: 0;
}

/* ---- Buttons -------------------------------------------------------- */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.85rem 1.4rem;
  font-size: var(--text-base);
  font-weight: 500;
  letter-spacing: -0.005em;
  border-radius: 2px;
  border: 1px solid transparent;
  text-decoration: none;
  transition: transform var(--duration) var(--ease),
              background var(--duration) var(--ease),
              color var(--duration) var(--ease);
  will-change: transform;
}
.btn:hover { transform: translateY(-1px); }
.btn:active { transform: translateY(0); }

.btn-primary {
  background: var(--color-ink);
  color: var(--color-accent-ink);
}
.btn-primary:hover { background: var(--color-accent); color: var(--color-accent-ink); }

.btn-secondary {
  background: transparent;
  color: var(--color-ink);
  border-color: var(--color-ink);
}
.btn-secondary:hover { background: var(--color-ink); color: var(--color-accent-ink); }

/* ---- Proof strip ---------------------------------------------------- */

.proof {
  background: var(--color-surface-ink);
  color: var(--color-accent-ink);
  padding: var(--space-5) var(--space-4);
}

.proof-grid {
  list-style: none;
  margin: 0 auto;
  padding: 0;
  max-width: 1100px;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: var(--space-4);
}

.proof-stat {
  font-family: var(--font-display);
  font-size: var(--text-stat);
  margin: 0 0 var(--space-1);
  letter-spacing: -0.03em;
  line-height: 1;
  color: var(--color-accent);
}
.proof-label {
  margin: 0;
  font-size: var(--text-sm);
  color: color-mix(in oklab, var(--color-accent-ink) 80%, transparent);
  max-width: 28ch;
}

/* ---- Section base --------------------------------------------------- */

.hiw,
.why-now,
.pricing,
.honesty,
.founder {
  padding: var(--space-section) var(--space-4);
  max-width: 1100px;
  margin-inline: auto;
}

h2 {
  font-family: var(--font-display);
  font-size: var(--text-h2);
  letter-spacing: -0.015em;
  line-height: 1.15;
  margin: 0 0 var(--space-4);
  font-weight: 600;
  max-width: 22ch;
}
h2 em { color: var(--color-accent); font-style: italic; }

h3 {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: var(--text-lg);
  margin: 0 0 var(--space-2);
  letter-spacing: -0.01em;
}

p { max-width: var(--measure); }

/* ---- How it works (numbered editorial list) ----------------------- */

.hiw-list {
  list-style: none;
  counter-reset: step;
  padding: 0;
  margin: 0;
  display: grid;
  gap: var(--space-5);
}
.hiw-list li {
  counter-increment: step;
  display: grid;
  grid-template-columns: minmax(3rem, 4rem) 1fr;
  gap: var(--space-3);
  border-top: 1px solid var(--color-rule);
  padding-top: var(--space-3);
}
.hiw-list li::before {
  content: counter(step, decimal-leading-zero);
  font-family: var(--font-display);
  font-size: var(--text-h2);
  color: var(--color-accent);
  line-height: 1;
}
.hiw-list p { margin: 0; color: var(--color-ink-soft); }

/* ---- Why-now block ------------------------------------------------- */

.why-now {
  background: var(--color-surface-2);
  border-top: 1px solid var(--color-rule);
  border-bottom: 1px solid var(--color-rule);
  max-width: none;
  margin-inline: 0;
  padding-block: var(--space-section);
}
.why-now h2,
.why-now p { max-width: 1100px; margin-inline: auto; }
.why-now p { color: var(--color-ink-soft); font-size: var(--text-lg); }

/* ---- Pricing ------------------------------------------------------- */

.pricing-note {
  margin: 0 0 var(--space-4);
  color: var(--color-ink-soft);
}
.tier-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: var(--space-3);
  align-items: stretch;
}
.tier {
  border: 1px solid var(--color-rule);
  background: var(--color-surface);
  padding: var(--space-4);
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}
.tier-featured {
  border-color: var(--color-ink);
  box-shadow: 6px 6px 0 var(--color-ink);
  transform: translateY(-4px);
}
.tier-price {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  margin: 0;
  color: var(--color-ink-muted);
}
.tier-price span {
  font-size: var(--text-h2);
  color: var(--color-ink);
  letter-spacing: -0.02em;
}
.tier ul {
  margin: 0 0 auto;
  padding: 0;
  list-style: none;
  display: grid;
  gap: var(--space-1);
  font-size: var(--text-sm);
  color: var(--color-ink-soft);
}
.tier ul li::before {
  content: "→";
  color: var(--color-accent);
  margin-right: 0.5em;
}
.tier .btn { margin-top: var(--space-3); }

/* ---- Honesty + founder -------------------------------------------- */

.honesty ul {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  gap: var(--space-2);
  border-top: 1px solid var(--color-rule);
  padding-top: var(--space-3);
}
.honesty li { color: var(--color-ink-soft); padding-left: 1.2em; position: relative; }
.honesty li::before {
  content: "—";
  position: absolute;
  left: 0;
  color: var(--color-accent);
}

.founder {
  border-top: 1px solid var(--color-rule);
}
.founder p { color: var(--color-ink-soft); font-size: var(--text-lg); margin-bottom: var(--space-3); }

/* ---- Footer -------------------------------------------------------- */

.site-footer {
  border-top: 1px solid var(--color-rule);
  padding: var(--space-4);
  text-align: center;
  font-size: var(--text-sm);
  color: var(--color-ink-muted);
}
.footer-fine { margin: var(--space-2) 0 0; font-size: var(--text-xs); }

/* ---- Reduced motion / responsive --------------------------------- */

@media (prefers-reduced-motion: reduce) {
  .btn { transition: none; }
  .btn:hover { transform: none; }
}

@media (max-width: 720px) {
  .hero { padding-top: var(--space-5); }
  .tier-featured { transform: none; box-shadow: none; }
  .hiw-list li { grid-template-columns: 1fr; gap: var(--space-2); }
  .hiw-list li::before { font-size: var(--text-lg); }
}

/* ---- Signup card (T001 leading-indicator capture) --------------- */

.signup {
  margin: var(--space-5) 0 var(--space-6);
  padding: 0 var(--space-3);
}

.signup-card {
  max-width: 56rem;
  margin: 0 auto;
  padding: clamp(var(--space-4), 4vw, var(--space-5));
  background: var(--color-surface-2);
  border: 1px solid var(--color-rule);
  border-left: 3px solid var(--color-accent);
}

.signup-card h2 {
  font-family: var(--font-display);
  font-size: var(--text-h2);
  line-height: 1.15;
  margin: 0 0 var(--space-2);
  letter-spacing: -0.01em;
}

.signup-lede {
  color: var(--color-ink-soft);
  max-width: var(--measure);
  margin: 0 0 var(--space-4);
  font-size: var(--text-base);
  line-height: 1.55;
}

.signup-form {
  display: grid;
  gap: var(--space-3);
}

.signup-row {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: var(--space-3);
}

.signup-field {
  display: grid;
  gap: var(--space-1);
}

.signup-label {
  font-size: var(--text-xs);
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--color-ink-muted);
}

.signup-form input[type="email"],
.signup-form select {
  font: inherit;
  font-size: var(--text-base);
  padding: 0.625rem 0.75rem;
  border: 1px solid var(--color-rule);
  background: var(--color-surface);
  color: var(--color-ink);
  border-radius: 2px;
  transition: border-color var(--duration) var(--ease);
}

.signup-form input[type="email"]:focus,
.signup-form select:focus {
  outline: 2px solid var(--color-accent);
  outline-offset: 1px;
  border-color: var(--color-accent);
}

.signup-consent {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: var(--space-2);
  align-items: start;
  font-size: var(--text-sm);
  color: var(--color-ink-soft);
  line-height: 1.5;
}

.signup-consent input[type="checkbox"] {
  margin-top: 0.25rem;
  accent-color: var(--color-accent);
  width: 1rem;
  height: 1rem;
}

.signup-actions {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--space-3);
}

.signup-status {
  margin: 0;
  font-size: var(--text-sm);
  color: var(--color-ink-muted);
}

.signup-status[data-kind="ok"]      { color: oklch(38% 0.13 150); }
.signup-status[data-kind="error"]   { color: var(--color-accent); }
.signup-status[data-kind="pending"] { color: var(--color-ink-soft); }

.signup-fineprint {
  margin: var(--space-3) 0 0;
  font-size: var(--text-sm);
  color: var(--color-ink-muted);
  max-width: var(--measure);
}

.signup-form button[disabled] {
  opacity: 0.6;
  cursor: progress;
}

@media (max-width: 720px) {
  .signup-row { grid-template-columns: 1fr; }
}