/* Sentinel tokens (crosscheckiq/docs/design-system/tokens.json). Dark first; light for daytime. */
:root {
  --bg: #0e1116;
  --surface-1: #151a21;
  --surface-2: #1c232c;
  --border: #2e3846;
  --text-primary: #e6eaf0;
  --text-secondary: #a3aebd;
  --primary: #5b9bf0;
  --primary-contrast: #0b1220;
  --secondary: #3bb5c4;
  --focus-ring: #7db4ff;
  /* No web-font downloads: agency networks often block outside font hosts. */
  --sans: "Inter Variable", "Inter", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  --display: "Space Grotesk Variable", "Space Grotesk", var(--sans);
  color-scheme: dark;
}

@media (prefers-color-scheme: light) {
  :root {
    --bg: #f5f7fa;
    --surface-1: #ffffff;
    --surface-2: #eef1f5;
    --border: #d3d9e1;
    --text-primary: #141a22;
    --text-secondary: #4a5565;
    --primary: #1f6fd1;
    --primary-contrast: #ffffff;
    --secondary: #0e7c8a;
    --focus-ring: #1f6fd1;
    color-scheme: light;
  }
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text-primary);
  font: 16px/1.6 var(--sans);
}

a {
  color: var(--primary);
}

a:focus-visible,
.button:focus-visible {
  outline: 2px solid var(--focus-ring);
  outline-offset: 2px;
}

.wrap {
  max-width: 1120px;
  margin: 0 auto;
  padding: 0 16px;
}

/* --- Header ------------------------------------------------------------------------------------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1;
  background: var(--bg);
  border-bottom: 1px solid var(--border);
}

.header-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  min-height: 64px;
  flex-wrap: wrap;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  color: var(--text-primary);
  text-decoration: none;
}

.wordmark {
  /* Matches CrossCheckIqLogo.tsx: Space Grotesk 700, "IQ" in secondary. */
  font: 700 20px/1 var(--display);
  letter-spacing: -0.012em;
}

.wordmark .iq {
  color: var(--secondary);
}

.site-header nav {
  display: flex;
  align-items: center;
  gap: 20px;
  flex-wrap: wrap;
}

.site-header nav a:not(.button) {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 14px;
}

.site-header nav a:not(.button):hover {
  color: var(--text-primary);
}

/* --- Buttons ------------------------------------------------------------------------------------ */
.button {
  display: inline-block;
  padding: 10px 18px;
  border-radius: 6px;
  font-weight: 500;
  font-size: 15px;
  text-decoration: none;
  border: 1px solid transparent;
}

.button-primary {
  background: var(--primary);
  color: var(--primary-contrast);
}

.button-outline {
  border-color: var(--border);
  color: var(--text-primary);
  padding: 6px 14px;
  font-size: 14px;
}

.button-text {
  color: var(--primary);
}

/* --- Sections ----------------------------------------------------------------------------------- */
.hero {
  padding: 96px 0 80px;
}

.eyebrow {
  margin: 0 0 12px;
  color: var(--secondary);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

h1,
h2,
h3 {
  font-family: var(--display);
  line-height: 1.2;
  margin: 0 0 16px;
}

h1 {
  font-size: clamp(32px, 6vw, 52px);
  max-width: 16ch;
}

h2 {
  font-size: clamp(24px, 4vw, 32px);
}

h3 {
  font-size: 18px;
}

.lead {
  color: var(--text-secondary);
  font-size: 18px;
  max-width: 62ch;
}

.actions {
  display: flex;
  gap: 12px;
  margin-top: 28px;
  flex-wrap: wrap;
}

.band {
  padding: 72px 0;
  border-top: 1px solid var(--border);
}

.band-alt {
  background: var(--surface-1);
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 16px;
  margin-top: 24px;
}

.card {
  background: var(--surface-1);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 24px;
}

.card p {
  margin: 0;
  color: var(--text-secondary);
}

.two-col {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 40px;
  align-items: start;
}

.checklist {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 16px;
}

.checklist li {
  padding-left: 28px;
  position: relative;
  color: var(--text-secondary);
}

.checklist li::before {
  content: "";
  position: absolute;
  left: 4px;
  top: 8px;
  width: 10px;
  height: 6px;
  border-left: 2px solid var(--secondary);
  border-bottom: 2px solid var(--secondary);
  transform: rotate(-45deg);
}

.checklist strong {
  color: var(--text-primary);
}

.contact {
  text-align: center;
}

.contact .lead {
  margin: 0 auto;
}

.contact-line {
  margin-top: 24px;
  color: var(--text-secondary);
}

/* --- Footer ------------------------------------------------------------------------------------- */
.site-footer {
  border-top: 1px solid var(--border);
  padding: 24px 0;
  color: var(--text-secondary);
  font-size: 14px;
}

.footer-row {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  flex-wrap: wrap;
}

.site-footer nav {
  display: flex;
  gap: 20px;
}

.site-footer a {
  color: var(--text-secondary);
}