:root {
  color: #292337;
  background: #f5f3f8;
  font-family: Inter, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-synthesis: none;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body { margin: 0; min-width: 320px; }
a { color: inherit; }

.topbar {
  align-items: center;
  background: #8f1720;
  display: flex;
  justify-content: space-between;
  min-height: 64px;
  padding: 12px max(20px, calc((100% - 980px) / 2));
}

.brand img { display: block; height: 30px; max-width: 150px; }
.open-chat {
  border: 1px solid rgba(255,255,255,.55);
  border-radius: 999px;
  color: white;
  font-size: 14px;
  font-weight: 650;
  padding: 9px 16px;
  text-decoration: none;
}

main { margin: 0 auto; max-width: 980px; padding: 46px 20px 64px; }
.hero { align-items: center; display: flex; gap: 28px; margin-bottom: 30px; }
.app-icon { height: 104px; width: 104px; }
.eyebrow { color: #8f1720; font-size: 13px; font-weight: 750; letter-spacing: .08em; text-transform: uppercase; }
h1 { font-size: clamp(30px, 5vw, 48px); letter-spacing: -.035em; line-height: 1.08; margin: 8px 0 12px; }
.hero p { color: #6a6375; font-size: 18px; margin: 0; }

.platform-nav { display: flex; gap: 10px; margin-bottom: 20px; }
.platform-nav a {
  background: #eee7f8;
  border: 1px solid #d9c8ee;
  border-radius: 999px;
  color: #5d2198;
  font-weight: 700;
  padding: 10px 18px;
  text-decoration: none;
}

.platform-card, .checklist, .troubleshooting {
  background: white;
  border: 1px solid #e5dfeb;
  border-radius: 24px;
  box-shadow: 0 16px 45px rgba(63, 39, 91, .07);
  margin-top: 20px;
  padding: clamp(22px, 4vw, 36px);
}
.platform-card { scroll-margin-top: 20px; }
.platform-heading { align-items: center; display: flex; gap: 14px; }
.platform-heading span:not(.platform-icon) { color: #777080; font-size: 13px; }
.platform-heading h2 { font-size: 28px; margin: 1px 0 0; }
.platform-icon {
  align-items: center;
  background: linear-gradient(145deg, #8f1720, #b35d64);
  border-radius: 14px;
  color: white;
  display: flex;
  font-size: 22px;
  font-weight: 800;
  height: 48px;
  justify-content: center;
  width: 48px;
}
.platform-icon.apple { background: #302b36; }
.steps { counter-reset: step; list-style: none; margin: 28px 0 20px; padding: 0; }
.steps li { min-height: 58px; padding: 0 0 22px 54px; position: relative; }
.steps li::before {
  align-items: center;
  background: #f0e7fa;
  border: 1px solid #d8c2ee;
  border-radius: 50%;
  color: #8f1720;
  content: counter(step);
  counter-increment: step;
  display: flex;
  font-weight: 800;
  height: 34px;
  justify-content: center;
  left: 0;
  position: absolute;
  top: 0;
  width: 34px;
}
.steps li:not(:last-child)::after { background: #e4dbea; content: ""; height: calc(100% - 40px); left: 17px; position: absolute; top: 39px; width: 1px; }
.steps strong, .steps span { display: block; }
.steps strong { font-size: 16px; margin-bottom: 5px; }
.steps span, details p, .checklist li, .troubleshooting p { color: #6a6375; line-height: 1.55; }
.important { background: #f6effd; border-left: 3px solid #8a38ce; border-radius: 10px; margin-top: 22px; padding: 14px 16px; }
details { background: #f7f5f9; border-radius: 14px; padding: 15px 18px; }
summary { cursor: pointer; font-weight: 700; }
details p { margin-bottom: 0; }
.checklist h2, .troubleshooting h2 { margin: 0 0 14px; }
.checklist ul { margin: 0; padding-left: 22px; }
.checklist li { margin: 8px 0; }
.troubleshooting a { color: #8f1720; font-weight: 750; }
footer { color: #807789; display: flex; font-size: 13px; gap: 18px; justify-content: space-between; margin: 0 auto; max-width: 980px; padding: 0 20px 32px; }

@media (max-width: 620px) {
  main { padding-top: 30px; }
  .hero { align-items: flex-start; gap: 16px; }
  .app-icon { height: 68px; width: 68px; }
  .hero p { font-size: 16px; }
  .platform-nav { overflow-x: auto; }
  .platform-nav a { white-space: nowrap; }
  footer { flex-direction: column; gap: 6px; }
}