:root {
  --font-serif: Georgia, "Iowan Old Style", "Palatino Linotype", "Book Antiqua", serif;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Consolas, "Liberation Mono", monospace;

  --color-bg: #f7f6f2;
  --color-surface: #ffffff;
  --color-text: #1a1c22;
  --color-muted: #5b5f6b;
  --color-border: #dedad2;
  --color-accent: #12203b;
  --color-accent-soft: #eef1f6;
  --color-flag: #8a3b12;
  --color-flag-bg: #fbf0e6;
  --color-high: #12203b;
  --color-medium: #6b5b1f;

  --max-width: 1120px;
  --measure: 680px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

html,
body {
  overflow-x: hidden;
}

body {
  margin: 0;
  background: var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3 {
  font-family: var(--font-serif);
  font-weight: 700;
  line-height: 1.2;
  margin: 0 0 0.5em;
  letter-spacing: -0.01em;
}

h1 { font-size: clamp(2rem, 4vw, 2.75rem); }
h2 { font-size: clamp(1.5rem, 3vw, 2rem); }
h3 { font-size: 1.125rem; }

p {
  margin: 0 0 1em;
  color: var(--color-text);
}

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

.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;
}

.skip-link {
  position: absolute;
  left: -999px;
  top: 0;
  background: var(--color-accent);
  color: #fff;
  padding: 10px 16px;
  z-index: 100;
}

.skip-link:focus {
  left: 0;
}

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

.container--narrow {
  max-width: var(--measure);
}

/* Header */

.site-header {
  border-bottom: 1px solid var(--color-border);
  background: var(--color-bg);
}

.header-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 20px 24px;
}

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

.logo-mark {
  flex-shrink: 0;
}

.logo-text {
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: 1.25rem;
  letter-spacing: -0.01em;
}

/* Buttons */

.button {
  display: inline-block;
  font-family: var(--font-sans);
  font-weight: 600;
  font-size: 0.95rem;
  text-decoration: none;
  padding: 13px 24px;
  border-radius: 3px;
  border: 1px solid transparent;
  cursor: pointer;
}

.button--primary {
  background: var(--color-accent);
  color: #fff;
}

.button--primary:hover {
  background: #0c1728;
}

.button--outline {
  background: transparent;
  color: var(--color-accent);
  border-color: var(--color-accent);
}

.button--outline:hover {
  background: var(--color-accent-soft);
}

.button--small {
  padding: 9px 16px;
  font-size: 0.875rem;
}

/* Hero */

.hero {
  padding: 72px 0 88px;
  border-bottom: 1px solid var(--color-border);
}

.hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
  gap: 56px;
  align-items: center;
}

.lede {
  font-size: 1.125rem;
  color: var(--color-muted);
  max-width: 46ch;
}

.hero-actions {
  margin-top: 32px;
}

.hero-note {
  color: var(--color-muted);
  font-size: 0.875rem;
  margin: 12px 0 0;
}

/* Hero visual */

.hero-visual {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: 4px;
  padding: 24px;
}

.visual-label {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--color-muted);
  margin: 0 0 12px;
}

.visual-flag {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-top: 16px;
  padding: 10px 12px;
  background: var(--color-flag-bg);
  color: var(--color-flag);
  border-radius: 3px;
  font-size: 0.9rem;
}

.flag-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--color-flag);
  flex-shrink: 0;
}

/* Data tables */

.table-scroll {
  overflow-x: auto;
}

.data-table {
  width: 100%;
  border-collapse: collapse;
  font-family: var(--font-mono);
  font-size: 0.875rem;
}

.data-table th,
.data-table td {
  text-align: left;
  padding: 12px 14px;
  border-bottom: 1px solid var(--color-border);
  white-space: nowrap;
}

.data-table th {
  font-family: var(--font-sans);
  font-weight: 600;
  color: var(--color-muted);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  border-bottom: 1px solid var(--color-text);
}

.data-table tr.is-flagged td {
  background: var(--color-flag-bg);
  color: var(--color-flag);
}

.confidence {
  display: inline-block;
  padding: 2px 10px;
  border-radius: 999px;
  font-family: var(--font-sans);
  font-size: 0.75rem;
  font-weight: 600;
}

.confidence--high {
  background: var(--color-accent-soft);
  color: var(--color-high);
}

.confidence--medium {
  background: #f6f1e2;
  color: var(--color-medium);
}

/* Sections */

.section {
  padding: 72px 0;
  border-bottom: 1px solid var(--color-border);
}

.section--muted {
  background: var(--color-surface);
}

.section--final {
  text-align: center;
}

.section:last-of-type {
  border-bottom: none;
}

.callout {
  font-size: 1.0625rem;
  font-weight: 600;
  border-left: 3px solid var(--color-accent);
  padding-left: 16px;
}

.hypothesis {
  font-family: var(--font-serif);
  font-size: 1.25rem;
  font-style: italic;
  color: var(--color-text);
  border-left: 3px solid var(--color-accent);
  padding-left: 20px;
}

.fine-print {
  color: var(--color-muted);
  font-size: 0.875rem;
  margin-top: 8px;
}

/* Lists */

.checklist {
  list-style: none;
  padding: 0;
  margin: 0 0 24px;
  display: grid;
  gap: 10px;
}

.checklist li {
  padding-left: 20px;
  position: relative;
  color: var(--color-text);
}

.checklist li::before {
  content: "\2013";
  position: absolute;
  left: 0;
  color: var(--color-muted);
}

.checklist--plain {
  margin-bottom: 0;
}

.field-list {
  list-style: none;
  padding: 0;
  margin: 0 0 20px;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px 24px;
  font-family: var(--font-mono);
  font-size: 0.9375rem;
}

.field-list li {
  padding: 8px 0;
  border-bottom: 1px solid var(--color-border);
}

/* Steps */

.steps {
  list-style: none;
  padding: 0;
  margin: 32px 0 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 32px;
}

.steps li {
  border-top: 2px solid var(--color-accent);
  padding-top: 16px;
}

.step-index {
  display: block;
  font-family: var(--font-mono);
  color: var(--color-muted);
  font-size: 0.8125rem;
  margin-bottom: 8px;
}

.step-note {
  color: var(--color-muted);
  font-size: 0.875rem;
}

/* Cards */

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 24px;
  margin-top: 32px;
}

.card {
  background: var(--color-bg);
  border: 1px solid var(--color-border);
  border-radius: 4px;
  padding: 24px;
}

.section-cta {
  margin-top: 40px;
}

.platform-note {
  margin-top: 24px;
  color: var(--color-muted);
  font-size: 0.8125rem;
  font-style: italic;
}

/* Footer */

.site-footer {
  padding: 48px 0 24px;
}

.footer-inner {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 24px;
  padding-bottom: 24px;
}

.footer-logo {
  font-family: var(--font-serif);
  font-weight: 700;
  margin: 0 0 4px;
}

.footer-tagline {
  color: var(--color-muted);
  font-size: 0.875rem;
  margin: 0;
}

.footer-links {
  display: flex;
  gap: 24px;
}

.footer-links a {
  color: var(--color-text);
  text-decoration: none;
  font-size: 0.9375rem;
}

.footer-links a:hover {
  text-decoration: underline;
}

.footer-copyright {
  color: var(--color-muted);
  font-size: 0.8125rem;
  margin: 0;
  border-top: 1px solid var(--color-border);
  padding-top: 20px;
}

/* Responsive */

@media (max-width: 860px) {
  .hero-grid {
    grid-template-columns: minmax(0, 1fr);
    gap: 40px;
  }

  .hero {
    padding: 48px 0 56px;
  }

  .section {
    padding: 48px 0;
  }

  .field-list {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 520px) {
  .header-inner {
    padding: 16px;
  }

  .data-table th,
  .data-table td {
    padding: 10px;
  }

  .hero-visual {
    padding: 16px;
  }

  .footer-inner {
    flex-direction: column;
  }
}