/* AccessProof Authority System — design tokens from ../DESIGN.md
   Mobile-first: base rules target <768px, min-width(768px) query layers on
   the desktop reflow (multi-column grids, restored 32px margins, visible nav). */

:root {
  --color-surface: #f7f9fb;
  --color-surface-container-lowest: #ffffff;
  --color-surface-container-low: #f2f4f6;
  --color-surface-container: #eceef0;
  --color-surface-container-high: #e6e8ea;
  --color-on-surface: #191c1e;
  --color-on-surface-variant: #44474d;
  --color-outline: #75777e;
  --color-outline-variant: #c5c6cd;

  --color-primary: #000000;
  --color-primary-container: #0d1c32;
  --color-on-primary: #ffffff;

  --color-secondary: #003ec6;
  --color-secondary-container: #0052fe;
  --color-secondary-fixed: #dde1ff;
  --color-on-secondary: #ffffff;
  --color-on-secondary-fixed: #001452;

  --color-tertiary-fixed: #6ffbbe;
  --color-on-tertiary-container: #009668;
  --color-on-tertiary-fixed: #002113;

  --color-primary-fixed: #d6e3ff;
  --color-on-primary-fixed: #0d1c32;

  --color-error: #ba1a1a;
  --color-on-error: #ffffff;

  --font-body: "Public Sans", system-ui, sans-serif;

  --radius-md: 0.75rem;
  --radius-full: 9999px;

  --space-base: 4px;
  --space-xs: 0.5rem;
  --space-sm: 1rem;
  --space-md: 1.5rem;
  --space-lg: 2.5rem;
  --space-xl: 4rem;
  --space-gutter: 24px;
  --margin-mobile: 16px;
  --margin-desktop: 32px;

  --shadow-low: 0px 1px 3px rgba(10, 25, 47, 0.05), 0px 1px 2px rgba(10, 25, 47, 0.03);
  --shadow-high: 0px 10px 15px -3px rgba(10, 25, 47, 0.1), 0px 4px 6px -2px rgba(10, 25, 47, 0.05);
}

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

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

body {
  margin: 0;
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.6;
  font-weight: 400;
  color: var(--color-on-surface);
  background: var(--color-surface);
  overflow-x: hidden;
}

img {
  max-width: 100%;
  display: block;
}

a {
  color: inherit;
}

button {
  font-family: inherit;
}

.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  z-index: 100;
  background: var(--color-secondary-container);
  color: var(--color-on-secondary);
  padding: var(--space-xs) var(--space-sm);
  border-radius: var(--radius-md);
}

.skip-link:focus {
  left: var(--margin-mobile);
  top: var(--margin-mobile);
}

:focus-visible {
  outline: 2px solid var(--color-secondary-container);
  outline-offset: 2px;
}

.wrap {
  max-width: 1280px;
  margin-inline: auto;
  padding-inline: var(--margin-mobile);
}

/* Alert banner */

.alert-banner {
  background: var(--color-error);
  color: var(--color-on-error);
  text-align: center;
  padding: var(--space-xs) var(--margin-mobile);
  font-size: 14px;
  font-weight: 600;
  line-height: 1.2;
}

.alert-banner a {
  text-decoration: underline;
  margin-left: var(--space-xs);
  white-space: nowrap;
}

/* Header / nav */

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: var(--color-surface-container-lowest);
  border-bottom: 1px solid var(--color-outline-variant);
  box-shadow: var(--shadow-low);
}

.site-header .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
  gap: var(--space-sm);
}

.brand {
  font-size: 22px;
  font-weight: 600;
  line-height: 1.3;
  color: var(--color-primary-container);
  white-space: nowrap;
}

.nav-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border: 1px solid var(--color-outline-variant);
  border-radius: var(--radius-md);
  background: transparent;
  cursor: pointer;
}

.nav-toggle svg {
  width: 22px;
  height: 22px;
}

.primary-nav {
  display: none;
  position: absolute;
  top: 72px;
  left: 0;
  right: 0;
  background: var(--color-surface-container-lowest);
  border-bottom: 1px solid var(--color-outline-variant);
  box-shadow: var(--shadow-low);
  padding: var(--space-sm) var(--margin-mobile) var(--space-md);
}

.primary-nav.is-open {
  display: block;
}

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

.primary-nav a {
  text-decoration: none;
  font-weight: 600;
  font-size: 16px;
  color: var(--color-on-surface-variant);
}

.primary-nav a[aria-current="page"] {
  color: var(--color-secondary);
}

.nav-actions {
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
}

/* Buttons */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 48px;
  padding: var(--space-xs) var(--space-md);
  border-radius: var(--radius-md);
  font-size: 14px;
  font-weight: 600;
  line-height: 1.2;
  letter-spacing: 0.01em;
  text-decoration: none;
  border: 1.5px solid transparent;
  cursor: pointer;
  transition: opacity 0.2s ease, background-color 0.2s ease;
}

.btn-primary {
  background: var(--color-secondary-container);
  color: var(--color-on-primary);
}

.btn-primary:hover {
  opacity: 0.9;
}

.btn-secondary {
  background: transparent;
  border-color: var(--color-primary-container);
  color: var(--color-primary-container);
}

.btn-secondary:hover {
  background: var(--color-surface-container-low);
}

.btn-block {
  width: 100%;
}

/* Main sections */

main {
  padding-block: var(--space-xl);
}

main .wrap > section + section,
main .wrap > section {
  margin-bottom: var(--space-xl);
}

.hero {
  display: flex;
  flex-direction: column;
  gap: var(--space-lg);
}

.hero h1 {
  font-size: 32px;
  font-weight: 700;
  line-height: 1.2;
  margin: 0 0 var(--space-md);
}

.hero h1 .accent {
  color: var(--color-secondary);
}

.hero p {
  font-size: 18px;
  line-height: 1.6;
  color: var(--color-on-surface-variant);
  margin: 0 0 var(--space-md);
}

.hero-actions {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.hero-media {
  position: relative;
  height: 260px;
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid var(--color-outline-variant);
  background: var(--color-surface-container-lowest) center/cover no-repeat;
  box-shadow: var(--shadow-high);
}

/* Process */

.process {
  background: var(--color-surface-container-lowest);
  border: 1px solid var(--color-outline-variant);
  border-radius: var(--radius-md);
  padding: var(--space-md);
  box-shadow: var(--shadow-low);
}

.process ol {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: var(--space-lg);
  text-align: center;
}

.process li {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-xs);
}

.step-icon {
  width: 64px;
  height: 64px;
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
}

.step-icon svg {
  width: 32px;
  height: 32px;
}

.process h3 {
  font-size: 24px;
  font-weight: 600;
  line-height: 1.3;
  margin: 0;
}

.process p {
  color: var(--color-on-surface-variant);
  margin: 0;
}

.step-icon--install { background: var(--color-secondary-fixed); color: var(--color-on-secondary-fixed); }
.step-icon--scan { background: var(--color-primary-fixed); color: var(--color-on-primary-fixed); }
.step-icon--report { background: var(--color-tertiary-fixed); color: var(--color-on-tertiary-fixed); }

/* Section intros */

.section-intro {
  text-align: center;
  max-width: 42rem;
  margin: 0 auto var(--space-lg);
}

.section-intro h2 {
  font-size: 32px;
  font-weight: 700;
  line-height: 1.2;
  margin: 0 0 var(--space-sm);
}

.section-intro p {
  font-size: 18px;
  color: var(--color-on-surface-variant);
  margin: 0;
}

/* Feature grid */

.feature-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-gutter);
}

.feature-card {
  background: var(--color-surface-container-lowest);
  border: 1px solid var(--color-outline-variant);
  border-radius: var(--radius-md);
  padding: var(--space-md);
  box-shadow: var(--shadow-low);
  transition: border-color 0.2s ease;
}

.feature-card:hover {
  border-color: var(--color-secondary);
}

.feature-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border-radius: var(--radius-md);
  background: var(--color-secondary-fixed);
  color: var(--color-secondary);
  margin-bottom: var(--space-xs);
}

.feature-icon svg {
  width: 24px;
  height: 24px;
}

.feature-card h3 {
  font-size: 24px;
  font-weight: 600;
  line-height: 1.3;
  margin: 0 0 var(--space-xs);
}

.feature-card p {
  color: var(--color-on-surface-variant);
  margin: 0;
}

/* Pricing */

.pricing-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-gutter);
}

.price-card {
  background: var(--color-surface-container-lowest);
  border: 1px solid var(--color-outline-variant);
  border-radius: var(--radius-md);
  padding: var(--space-lg) var(--space-md);
  box-shadow: var(--shadow-low);
  display: flex;
  flex-direction: column;
  position: relative;
}

.price-card--featured {
  border: 2px solid var(--color-secondary);
  box-shadow: var(--shadow-high);
}

.price-card__badge {
  position: absolute;
  top: 0;
  left: 50%;
  transform: translate(-50%, -50%);
  background: var(--color-secondary);
  color: var(--color-on-secondary);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  padding: var(--space-base) var(--space-sm);
  border-radius: var(--radius-full);
  white-space: nowrap;
}

.price-card h3 {
  font-size: 24px;
  font-weight: 600;
  margin: 0;
}

.price-card__amount {
  display: flex;
  align-items: baseline;
  gap: var(--space-base);
  margin: var(--space-sm) 0 var(--space-md);
}

.price-card__amount strong {
  font-size: 40px;
  font-weight: 700;
  line-height: 1.1;
}

.price-card__amount span {
  color: var(--color-on-surface-variant);
}

.price-card ul {
  list-style: none;
  margin: 0 0 var(--space-md);
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
  flex-grow: 1;
}

.price-card li {
  display: flex;
  align-items: flex-start;
  gap: var(--space-xs);
  color: var(--color-on-surface-variant);
}

.price-card li svg {
  flex: none;
  width: 20px;
  height: 20px;
  color: var(--color-secondary);
  margin-top: 2px;
}

.price-card__alt-cycle {
  display: block;
  text-align: center;
  margin-top: var(--space-xs);
  font-size: 14px;
  color: var(--color-secondary);
  text-decoration: none;
}

.price-card__alt-cycle:hover {
  text-decoration: underline;
}

.pricing-footnote {
  text-align: center;
  font-size: 14px;
  color: var(--color-on-surface-variant);
  margin-top: var(--space-md);
}

/* Footer */

.site-footer {
  background: var(--color-surface-container-high);
  margin-top: var(--space-xl);
}

.site-footer .wrap {
  padding-block: var(--space-lg);
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
  text-align: center;
}

.footer-brand {
  font-size: 14px;
  font-weight: 600;
  color: var(--color-primary);
  margin-bottom: var(--space-xs);
}

.footer-copy {
  font-size: 12px;
  font-weight: 500;
  line-height: 1.4;
  color: var(--color-on-surface-variant);
  max-width: 28rem;
  margin-inline: auto;
}

.footer-nav {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--space-md);
}

.footer-nav a {
  font-size: 12px;
  font-weight: 500;
  color: var(--color-on-surface-variant);
  text-decoration: none;
}

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

/* Desktop reflow — 768px breakpoint per DESIGN.md */

@media (min-width: 768px) {
  .wrap {
    padding-inline: var(--margin-desktop);
  }

  .nav-toggle {
    display: none;
  }

  .primary-nav {
    display: block;
    position: static;
    border: none;
    box-shadow: none;
    padding: 0;
    width: auto;
  }

  .primary-nav .wrap-inner {
    display: flex;
    align-items: center;
    gap: var(--space-gutter);
  }

  .primary-nav ul {
    flex-direction: row;
    align-items: center;
    margin: 0;
    gap: var(--space-gutter);
  }

  .nav-actions {
    flex-direction: row;
    align-items: center;
  }

  .hero {
    flex-direction: row;
    align-items: center;
  }

  .hero-content,
  .hero-media {
    flex: 1 1 50%;
  }

  .hero h1 {
    font-size: 48px;
    letter-spacing: -0.02em;
  }

  .hero-media {
    height: 420px;
  }

  .hero-actions {
    flex-direction: row;
  }

  .process ol {
    grid-template-columns: repeat(3, 1fr);
  }

  .section-intro h2 {
    font-size: 48px;
    letter-spacing: -0.02em;
  }

  .feature-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .pricing-grid {
    grid-template-columns: repeat(3, 1fr);
    align-items: center;
  }

  .price-card--featured {
    transform: translateY(-16px);
  }

  .site-footer .wrap {
    flex-direction: row;
    justify-content: space-between;
    text-align: left;
  }

  .footer-copy {
    margin-inline: 0;
  }
}