/* Klarifile marketing site
 *
 * Tokens are taken from docs/APP_DESIGN_BRIEF.md §3 so the site and the app
 * agree. Deliberately no third-party requests: no Google Fonts, no analytics,
 * no CDN. That keeps the privacy notice honest and avoids a cookie banner.
 */

:root {
  --colour-primary: #1565c0;
  --colour-primary-dark: #0d47a1;
  --colour-surface: #ffffff;
  --colour-page: #faf9f6;
  --colour-subtle: #fafafa;
  --colour-text: rgba(0, 0, 0, 0.87);
  --colour-text-secondary: rgba(0, 0, 0, 0.6);
  --colour-border: #c3c6cf;
  --colour-border-strong: #73777f;

  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-6: 24px;
  --space-8: 32px;
  --space-12: 48px;
  --space-16: 64px;

  --radius-small: 8px;
  --radius-card: 12px;
  --radius-large: 16px;

  --font: 'Work Sans', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto,
    'Helvetica Neue', Arial, sans-serif;

  --measure: 68ch;
  --container: 1080px;
}

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

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

body {
  margin: 0;
  font-family: var(--font);
  font-size: 16px;
  line-height: 1.6;
  color: var(--colour-text);
  background: var(--colour-page);
}

/* Meets WCAG AA: #1565c0 on #faf9f6 is 5.6:1 */
a {
  color: var(--colour-primary);
}

a:hover {
  color: var(--colour-primary-dark);
}

/* Visible focus for keyboard users (Constitution XXIII accessibility baseline) */
a:focus-visible,
button:focus-visible {
  outline: 3px solid var(--colour-primary);
  outline-offset: 2px;
  border-radius: var(--radius-small);
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  z-index: 10;
  padding: var(--space-3) var(--space-4);
  background: var(--colour-primary);
  color: #fff;
  text-decoration: none;
}

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

.container {
  width: 100%;
  max-width: var(--container);
  margin: 0 auto;
  padding: 0 var(--space-4);
}

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

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

.site-header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-4);
  min-height: 56px;
  padding-top: var(--space-3);
  padding-bottom: var(--space-3);
}

.brand {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  text-decoration: none;
  color: var(--colour-text);
  font-weight: 600;
  font-size: 18px;
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 32px;
  height: 32px;
  border-radius: var(--radius-small);
  background: var(--colour-primary);
  color: #fff;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.02em;
}

.site-nav {
  display: flex;
  gap: var(--space-4);
  font-size: 14px;
}

.site-nav a {
  text-decoration: none;
  padding: var(--space-2) var(--space-1);
}

.site-nav a:hover {
  text-decoration: underline;
}

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

.hero {
  padding: var(--space-16) 0 var(--space-12);
}

.hero h1 {
  margin: 0 0 var(--space-4);
  font-size: clamp(30px, 5vw, 44px);
  line-height: 1.15;
  font-weight: 700;
  letter-spacing: -0.01em;
  max-width: 20ch;
}

.hero .lede {
  margin: 0 0 var(--space-6);
  font-size: clamp(17px, 2.2vw, 20px);
  color: var(--colour-text-secondary);
  max-width: 52ch;
}

/* ---------- Status banner ---------- */

.status {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  margin-bottom: var(--space-6);
  padding: var(--space-2) var(--space-3);
  border: 1px solid var(--colour-border);
  border-radius: 999px;
  background: var(--colour-surface);
  font-size: 13px;
  font-weight: 500;
  color: var(--colour-text-secondary);
}

.status::before {
  content: '';
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--colour-primary);
}

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

.btn {
  display: inline-block;
  min-height: 48px; /* Constitution XXIII: touch targets >= 48dp */
  padding: var(--space-3) var(--space-6);
  border-radius: var(--radius-card);
  border: 1px solid transparent;
  font: inherit;
  font-size: 15px;
  font-weight: 500;
  text-decoration: none;
  cursor: pointer;
}

.btn-primary {
  background: var(--colour-primary);
  color: #fff;
}

.btn-primary:hover {
  background: var(--colour-primary-dark);
  color: #fff;
}

.btn-secondary {
  background: var(--colour-surface);
  border-color: var(--colour-primary);
  color: var(--colour-primary);
}

.btn-secondary:hover {
  background: var(--colour-subtle);
}

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

/* ---------- Sections ---------- */

section {
  padding: var(--space-12) 0;
}

section + section {
  border-top: 1px solid var(--colour-border);
}

h2 {
  margin: 0 0 var(--space-2);
  font-size: clamp(22px, 3.4vw, 28px);
  font-weight: 600;
  letter-spacing: -0.01em;
}

.section-intro {
  margin: 0 0 var(--space-8);
  color: var(--colour-text-secondary);
  max-width: var(--measure);
}

/* ---------- Cards ---------- */

.grid {
  display: grid;
  gap: var(--space-4);
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
}

.card {
  padding: var(--space-6);
  background: var(--colour-surface);
  border: 1px solid var(--colour-border);
  border-radius: var(--radius-card);
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.04);
}

.card h3 {
  margin: 0 0 var(--space-2);
  font-size: 17px;
  font-weight: 600;
}

.card p {
  margin: 0;
  font-size: 15px;
  color: var(--colour-text-secondary);
}

/* ---------- Prose (privacy page) ---------- */

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

.prose h2 {
  margin-top: var(--space-8);
  font-size: 20px;
}

.prose h2:first-of-type {
  margin-top: 0;
}

.prose h3 {
  margin-top: var(--space-6);
  font-size: 16px;
}

.prose p,
.prose li {
  color: var(--colour-text);
}

.prose ul {
  padding-left: var(--space-6);
}

.prose table {
  width: 100%;
  border-collapse: collapse;
  margin: var(--space-4) 0;
  font-size: 15px;
}

.prose th,
.prose td {
  padding: var(--space-3);
  border: 1px solid var(--colour-border);
  text-align: left;
  vertical-align: top;
}

.prose th {
  background: var(--colour-subtle);
  font-weight: 600;
}

.meta {
  margin: 0 0 var(--space-8);
  font-size: 14px;
  color: var(--colour-text-secondary);
}

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

.site-footer {
  border-top: 1px solid var(--colour-border);
  padding: var(--space-8) 0;
  font-size: 14px;
  color: var(--colour-text-secondary);
}

.site-footer .container {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-4);
  justify-content: space-between;
  align-items: flex-start;
}

.site-footer nav {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-4);
}

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

.site-footer a:hover {
  color: var(--colour-primary);
}

@media (max-width: 600px) {
  .hero {
    padding: var(--space-12) 0 var(--space-8);
  }
  section {
    padding: var(--space-8) 0;
  }
  .site-footer .container {
    flex-direction: column;
  }
}

@media (prefers-reduced-motion: reduce) {
  * {
    transition: none !important;
    animation: none !important;
  }
}