:root {
  color-scheme: light;
  --background: #f5f5f7;
  --surface: #ffffff;
  --text: #1d1d1f;
  --secondary: #6e6e73;
  --accent: #4d95c8;
  --border: #e5e5ea;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--background);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Hiragino Sans", "Yu Gothic", sans-serif;
  line-height: 1.7;
}

main {
  width: min(100% - 32px, 720px);
  margin: 0 auto;
  padding: 56px 0 72px;
}

header { margin-bottom: 28px; }
h1, h2, p { margin-top: 0; }

h1 {
  margin-bottom: 8px;
  font-size: clamp(28px, 6vw, 40px);
  letter-spacing: -0.02em;
  line-height: 1.2;
}

.lead { margin-bottom: 0; color: var(--secondary); font-size: 16px; }

section {
  margin-top: 16px;
  padding: 24px;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 18px;
}

h2 { margin-bottom: 12px; font-size: 20px; line-height: 1.35; }
ul, ol { margin: 0; padding-left: 1.4em; }
a { color: var(--accent); overflow-wrap: anywhere; }
.note { color: var(--secondary); font-size: 14px; }
.links { display: flex; flex-wrap: wrap; gap: 16px; margin-top: 20px; }

.app-download {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 160px;
  gap: 24px;
  align-items: center;
}

.app-download h2 { margin-bottom: 8px; }
.app-name { margin-bottom: 4px; font-size: 20px; font-weight: 600; }

.app-store-link {
  display: inline-block;
  margin-top: 8px;
  padding: 10px 16px;
  border-radius: 10px;
  background: var(--accent);
  color: #ffffff;
  font-weight: 600;
  text-decoration: none;
}

.app-store-link:hover { opacity: 0.9; }

.app-qr { margin: 0; text-align: center; }
.app-qr img { display: block; width: 160px; height: 160px; margin: 0 auto 8px; }
.app-qr figcaption { color: var(--secondary); font-size: 13px; }

footer {
  margin-top: 28px;
  color: var(--secondary);
  font-size: 13px;
  text-align: center;
}

footer a { color: var(--secondary); }

@media (max-width: 480px) {
  main { padding-top: 36px; }
  section { padding: 20px; }
  .app-download { grid-template-columns: 1fr; }
  .app-download-copy { text-align: center; }
}