/* Responsive framework + shared layout primitives.
   Breakpoint pixel values below are hardcoded because CSS @media
   conditions cannot reference custom properties -- asserted equal to
   design_tokens.py's VSITE_BREAKPOINT_* constants by
   tests/test_app_shell.py, so they cannot silently drift apart. */

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

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

body {
  margin: 0;
  font-family: var(--font-ui);
  font-weight: var(--weight-body);
  font-size: var(--size-2);
  line-height: var(--line-height-body);
  color: var(--color-body);
  background: var(--color-background);
}

.container {
  width: 100%;
  max-width: var(--vsite-container-max-width);
  margin-inline: auto;
  padding-inline: var(--space-4);
}

.visually-hidden {
  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: -9999px;
  top: 0;
  z-index: 1000;
  background: var(--color-accent);
  color: var(--color-background);
  padding: var(--space-2) var(--space-4);
}

.skip-link:focus {
  left: var(--space-4);
  top: var(--space-4);
}

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

.site-header__row {
  display: flex;
  align-items: center;
  gap: var(--space-6);
  padding-block: var(--space-4);
}

.brand {
  font-family: var(--font-serif);
  font-weight: var(--weight-heading);
  font-size: var(--size-3);
  color: var(--color-heading);
  text-decoration: none;
  margin-right: auto;
}

.primary-nav ul {
  display: flex;
  gap: var(--space-5);
  list-style: none;
  margin: 0;
  padding: 0;
}

.primary-nav a {
  color: var(--color-body);
  text-decoration: none;
  font-size: var(--size-1);
  font-weight: var(--weight-emphasis);
}

.primary-nav a:hover,
.primary-nav a:focus {
  color: var(--color-accent);
}

.nav-cta {
  margin-left: var(--space-5);
}

.button {
  display: inline-block;
  font-family: var(--font-ui);
  font-weight: var(--weight-emphasis);
  font-size: var(--size-1);
  padding: var(--space-2) var(--space-4);
  border-radius: 2px;
  text-decoration: none;
  border: 1px solid transparent;
}

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

.button--primary:hover,
.button--primary:focus {
  background: var(--color-accent-hover);
}

.site-footer {
  border-top: 1px solid var(--color-divider);
  background: var(--color-background-subtle);
  margin-top: var(--space-9);
}

.site-footer__grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: var(--space-6);
  padding-block: var(--space-7);
}

.site-footer h2 {
  font-size: var(--size-1);
  color: var(--color-muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  margin: 0 0 var(--space-3);
}

.site-footer ul {
  list-style: none;
  margin: 0;
  padding: 0;
}

.site-footer a {
  color: var(--color-body);
  text-decoration: none;
  font-size: var(--size-1);
}

.site-footer__brand {
  font-family: var(--font-serif);
  font-weight: var(--weight-heading);
  color: var(--color-heading);
  margin: 0 0 var(--space-3);
}

.site-footer__disclaimer {
  color: var(--color-muted);
  font-size: var(--size-0);
  max-width: 48ch;
}

/* Mobile: wrap nav below the brand row. A collapsing hamburger menu is
   deferred until it's driven by a real interaction requirement -- a
   wrapped flex row is a genuine, working responsive behaviour today, not
   a placeholder for one. */
@media (max-width: 768px) {
  .site-header__row {
    flex-wrap: wrap;
  }

  .primary-nav {
    order: 3;
    width: 100%;
  }

  .primary-nav ul {
    flex-wrap: wrap;
    gap: var(--space-4);
  }
}

/* Shared prose-page primitives -- Reports, How It Works, Trust & Security,
   and Pricing are all long-form institutional prose pages built from the
   same handful of patterns rather than bespoke per-page layout. */

.page-prose {
  max-width: 72ch;
  padding-block: var(--space-8);
}

.page-prose h1 {
  font-family: var(--font-ui);
  font-weight: var(--weight-heading);
  font-size: var(--size-6);
  color: var(--color-heading);
  margin: 0 0 var(--space-5);
}

.page-prose h2 {
  font-family: var(--font-ui);
  font-weight: var(--weight-heading);
  font-size: var(--size-4);
  color: var(--color-heading);
  margin: var(--space-8) 0 var(--space-4);
}

.page-lede {
  font-family: var(--font-serif);
  font-size: var(--size-3);
  line-height: var(--line-height-body);
  color: var(--color-body);
}

.page-prose p {
  font-family: var(--font-ui);
  font-size: var(--size-2);
  line-height: var(--line-height-body);
  color: var(--color-body);
}

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

.report-comparison-table {
  width: 100%;
  border-collapse: collapse;
  font-family: var(--font-ui);
  font-size: var(--size-1);
}

.report-comparison-table th,
.report-comparison-table td {
  text-align: left;
  padding: var(--space-3) var(--space-4);
  border-bottom: 1px solid var(--color-divider);
  vertical-align: top;
}

.report-comparison-table thead th {
  color: var(--color-muted);
  font-weight: var(--weight-emphasis);
  text-transform: uppercase;
  font-size: var(--size-0);
  letter-spacing: 0.04em;
}

/* Shared card grid -- used by the How It Works rule-family cards and
   reused as-is (same macro, same classes) by the Homepage's How It Works
   teaser band, so the two never drift into two different visual
   treatments of the same three rule families. */

.rule-family-list {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: var(--space-5);
  list-style: none;
  margin: 0;
  padding: 0;
}

.rule-family-card {
  border: 1px solid var(--color-border);
  padding: var(--space-5);
}

.rule-family-card__code {
  font-family: var(--font-mono);
  font-size: var(--size-0);
  color: var(--color-muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  margin: 0 0 var(--space-2);
}

.rule-family-card h3 {
  font-family: var(--font-ui);
  font-weight: var(--weight-heading);
  font-size: var(--size-3);
  color: var(--color-heading);
  margin: 0 0 var(--space-3);
}

.rule-family-card p:not(.rule-family-card__code) {
  font-family: var(--font-ui);
  font-size: var(--size-1);
  line-height: var(--line-height-body);
  color: var(--color-body);
  margin: 0;
}

.scorecard-explainer p {
  font-family: var(--font-ui);
  font-size: var(--size-2);
  line-height: var(--line-height-body);
  color: var(--color-body);
}

.trust-section {
  margin-bottom: var(--space-6);
}

/* Shared form primitives (Phase 2's enterprise contact form; Phase 3's
   gate/upload forms) -- one definition, not duplicated per page. */

.form-field {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.form-field label {
  font-family: var(--font-ui);
  font-size: var(--size-1);
  font-weight: var(--weight-emphasis);
  color: var(--color-heading);
}

.form-field input,
.form-field textarea {
  font-family: var(--font-ui);
  font-size: var(--size-2);
  color: var(--color-body);
  border: 1px solid var(--color-border);
  padding: var(--space-3);
}

.form-field--checkbox {
  flex-direction: row;
  align-items: flex-start;
  gap: var(--space-3);
}

.form-field--checkbox label {
  font-weight: var(--weight-body);
}

/* Phase 3 verification funnel: error summary banner (WCAG error
   identification), always a live region so a re-rendered form's rejection
   reason is announced without forcing renewed navigation. */

.error-summary {
  border-left: 3px solid var(--color-critical);
  background: var(--color-critical-background);
  padding: var(--space-4) var(--space-5);
  margin-bottom: var(--space-5);
  font-family: var(--font-ui);
  font-size: var(--size-1);
  color: var(--color-heading);
}

.governed-text-proof {
  border-left: 3px solid var(--color-accent);
  padding: var(--space-4) var(--space-5);
  background: var(--color-background-subtle);
}

.governed-text-proof__sentence {
  font-family: var(--font-serif);
  font-size: var(--size-2);
  line-height: var(--line-height-body);
  color: var(--color-body);
  margin: 0 0 var(--space-2);
}

.governed-text-proof__id {
  font-family: var(--font-mono);
  font-size: var(--size-0);
  color: var(--color-muted);
  margin: 0;
}

/* Architecture — public layer-stack diagram (an ASCII figure in a <pre>).
   Horizontal scroll on narrow viewports so the box-drawing never wraps. */
.architecture-stack {
  font-family: var(--font-mono);
  font-size: var(--size-0);
  line-height: 1.35;
  color: var(--color-body);
  background: var(--color-background-subtle);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-2, 8px);
  padding: var(--space-4) var(--space-5);
  overflow-x: auto;
  margin: var(--space-5) 0;
}