:root {
  --bg: #f6f8fb;
  --surface: #ffffff;
  --border: #e2e8f0;
  --text: #0f1b2d;
  --muted: #4b5b71;
  --brand: #0b3d91;      /* deep navy */
  --brand-2: #1668d9;    /* action blue */
  --accent: #ff8a1f;     /* warm accent */
  --success: #22a06b;
  --radius: 12px;
  --shadow: 0 1px 2px rgba(15,27,45,.05), 0 8px 24px rgba(15,27,45,.06);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; background: var(--bg); color: var(--text); }
body { line-height: 1.5; }

a { color: var(--brand-2); text-decoration: none; }
a:hover { text-decoration: underline; }

.sr { position: absolute; width: 1px; height: 1px; overflow: hidden; clip: rect(0 0 0 0); }

.topbar {
  display: flex; align-items: center; justify-content: space-between;
  padding: 18px 28px; background: var(--surface);
  border-bottom: 1px solid var(--border);
}
.brand { display: flex; align-items: center; gap: 12px; color: var(--text); }
.brand:hover { text-decoration: none; }
.brand-text { display: flex; flex-direction: column; line-height: 1.1; }
.brand-name { font-weight: 700; letter-spacing: -0.01em; }
.brand-tag { font-size: 12px; color: var(--muted); text-transform: uppercase; letter-spacing: 0.08em; }
.ret { font-size: 14px; color: var(--muted); }

main { max-width: 960px; margin: 0 auto; padding: 40px 24px 60px; }

.hero h1 {
  margin: 0 0 12px; font-size: clamp(28px, 3.5vw, 40px);
  letter-spacing: -0.02em; color: var(--brand);
}
.hero .lede {
  margin: 0; font-size: 17px; color: var(--muted); max-width: 62ch;
}

.downloads { margin-top: 40px; }
.grid {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 16px;
}
.card {
  display: grid; grid-template-columns: auto 1fr auto; align-items: center; gap: 16px;
  background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 18px 20px; color: var(--text); box-shadow: var(--shadow);
  transition: transform .08s ease, border-color .12s ease, box-shadow .12s ease;
}
.card:hover {
  text-decoration: none; transform: translateY(-1px);
  border-color: var(--brand-2);
  box-shadow: 0 2px 4px rgba(15,27,45,.06), 0 12px 28px rgba(15,27,45,.08);
}
.card-icon { color: var(--brand); display: flex; }
.card-title { font-weight: 700; }
.card-sub { font-size: 13px; color: var(--muted); }
.card-cta {
  font-size: 13px; font-weight: 600; color: #fff; background: var(--brand-2);
  padding: 8px 12px; border-radius: 999px;
}
.hint { margin-top: 14px; font-size: 14px; color: var(--muted); }

.how { margin-top: 48px; }
.how h2 {
  margin: 0 0 16px; font-size: 22px; color: var(--brand); letter-spacing: -0.01em;
}
.steps { list-style: none; padding: 0; margin: 0; display: grid; gap: 12px; }
.steps li {
  display: grid; grid-template-columns: 32px 1fr; gap: 12px; align-items: start;
  background: var(--surface); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 14px 16px;
}
.num {
  display: inline-flex; align-items: center; justify-content: center;
  width: 28px; height: 28px; border-radius: 50%;
  background: var(--brand); color: #fff; font-weight: 700; font-size: 14px;
}
.reassure { margin-top: 14px; color: var(--muted); font-size: 14px; }

footer { border-top: 1px solid var(--border); background: var(--surface); }
.foot {
  max-width: 960px; margin: 0 auto; padding: 18px 24px;
  display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 8px;
  color: var(--muted); font-size: 13px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0b1220;
    --surface: #121a2b;
    --border: #1e2a44;
    --text: #e8eef7;
    --muted: #9fb0c9;
    --brand: #6ea8fe;
    --brand-2: #4d8dfd;
    --shadow: 0 1px 2px rgba(0,0,0,.35), 0 8px 24px rgba(0,0,0,.35);
  }
  .card-cta { color: #0b1220; }
}