:root {
  --cna-navy: #1F3C7D;
  --cna-navy-dark: #152a58;
  --cna-navy-tint: #e8edf7;
  --ink: #0f1d3a;
  --ink-muted: #4b5a74;
  --surface: #ffffff;
  --surface-alt: #f7f8fb;
  --border: #e2e6ef;
  --radius-lg: 20px;
  --radius-md: 14px;
  --radius-sm: 8px;
  --shadow-soft: 0 1px 2px rgba(15, 29, 58, 0.04), 0 8px 24px rgba(15, 29, 58, 0.06);
  --shadow-hover: 0 1px 2px rgba(15, 29, 58, 0.06), 0 16px 32px rgba(15, 29, 58, 0.10);
}

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

html,
body {
  margin: 0;
  padding: 0;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  font-size: 16px;
  line-height: 1.5;
  color: var(--ink);
  background:
    radial-gradient(1200px 600px at 50% -200px, var(--cna-navy-tint) 0%, transparent 60%),
    var(--surface-alt);
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

.page {
  max-width: 960px;
  margin: 0 auto;
  padding: 32px 20px 48px;
  padding-top: calc(32px + env(safe-area-inset-top, 0px));
  padding-bottom: calc(48px + env(safe-area-inset-bottom, 0px));
}

.hero {
  text-align: center;
  padding: 16px 0 32px;
}

.logo {
  display: block;
  margin: 0 auto 24px;
  max-width: 220px;
  height: auto;
}

.title {
  margin: 0 0 10px;
  font-size: clamp(28px, 6vw, 40px);
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--ink);
}

.subtitle {
  margin: 0;
  color: var(--ink-muted);
  font-size: clamp(16px, 2.5vw, 18px);
}

.downloads {
  display: grid;
  gap: 20px;
  margin-top: 24px;
}

@media (min-width: 720px) {
  .downloads {
    grid-template-columns: 1fr 1fr;
    gap: 24px;
  }
}

.platform {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 28px 24px;
  box-shadow: var(--shadow-soft);
  display: flex;
  flex-direction: column;
  gap: 16px;
  transition: box-shadow 180ms ease, transform 180ms ease;
}

.platform:hover {
  box-shadow: var(--shadow-hover);
}

/* iOS-first ordering is handled by JS via [data-order] attribute swap */
.platform[data-order="1"] { order: 1; }
.platform[data-order="2"] { order: 2; }

.platform-head {
  display: flex;
  align-items: center;
  gap: 12px;
  color: var(--cna-navy);
}

.platform-title {
  margin: 0;
  font-size: 20px;
  font-weight: 600;
  color: var(--ink);
}

.platform-icon {
  flex: 0 0 auto;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  width: 100%;
  padding: 16px 20px;
  font-family: inherit;
  font-size: 17px;
  font-weight: 600;
  text-decoration: none;
  border-radius: var(--radius-md);
  border: 2px solid transparent;
  cursor: pointer;
  transition: background 160ms ease, color 160ms ease, border-color 160ms ease, transform 80ms ease;
  min-height: 56px;
}

.btn:active {
  transform: translateY(1px);
}

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

.btn-primary:hover,
.btn-primary:focus-visible {
  background: var(--cna-navy-dark);
  outline: none;
}

.btn-secondary {
  background: #fff;
  color: var(--cna-navy);
  border-color: var(--cna-navy);
}

.btn-secondary:hover,
.btn-secondary:focus-visible {
  background: var(--cna-navy-tint);
  outline: none;
}

.platform-note {
  margin: 0;
  color: var(--ink-muted);
  font-size: 14px;
  line-height: 1.5;
}

.help {
  border-top: 1px solid var(--border);
  padding-top: 16px;
  margin-top: 4px;
}

.help summary {
  cursor: pointer;
  font-weight: 500;
  color: var(--cna-navy);
  padding: 4px 0;
  list-style: none;
  display: flex;
  align-items: center;
  gap: 8px;
}

.help summary::-webkit-details-marker {
  display: none;
}

.help summary::before {
  content: "+";
  display: inline-block;
  width: 20px;
  height: 20px;
  border: 1px solid currentColor;
  border-radius: 50%;
  text-align: center;
  line-height: 18px;
  font-size: 14px;
  transition: transform 160ms ease;
}

.help[open] summary::before {
  content: "−";
}

.help ol {
  margin: 12px 0 0;
  padding-left: 22px;
  color: var(--ink-muted);
  font-size: 14px;
}

.help li + li {
  margin-top: 6px;
}

.qr-wrap {
  display: none;
  text-align: center;
  padding-top: 12px;
  border-top: 1px solid var(--border);
}

@media (min-width: 900px) and (hover: hover) and (pointer: fine) {
  .qr-wrap {
    display: block;
  }
}

.qr {
  display: inline-block;
  margin: 0 auto 8px;
  padding: 8px;
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  line-height: 0;
  min-height: 160px;
  min-width: 160px;
}

.qr canvas,
.qr img {
  display: block;
}

.qr-caption {
  margin: 0;
  color: var(--ink-muted);
  font-size: 13px;
}

.site-footer {
  margin-top: 40px;
  padding-top: 24px;
  border-top: 1px solid var(--border);
  text-align: center;
  color: var(--ink-muted);
  font-size: 13px;
}

.site-footer p {
  margin: 4px 0;
}

.site-footer a {
  color: var(--cna-navy);
  text-decoration: none;
  font-weight: 500;
}

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

@media (prefers-reduced-motion: reduce) {
  * {
    transition-duration: 0.001ms !important;
    animation-duration: 0.001ms !important;
  }
}