:root {
  color-scheme: dark;
  --bg: #10161c;
  --text: #f3f6f8;
  --muted: #a9b4be;
  --line: #2a3640;
  --cyan: #7ee0e8;
  --cyan-ink: #102226;
}

* { box-sizing: border-box; }

html { scrollbar-gutter: stable; }

body {
  margin: 0;
  min-height: 100vh;
  background: var(--bg);
  color: var(--text);
  font: 17px/1.6 -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Noto Sans CJK SC", sans-serif;
  -webkit-font-smoothing: antialiased;
}

main {
  max-width: 38rem;
  margin: 0 auto;
  padding: 18vh 24px 64px;
}

.name {
  margin: 0 0 18px;
  font-size: 14px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--cyan);
}

h1 {
  margin: 0;
  font-size: clamp(32px, 5vw, 46px);
  font-weight: 620;
  line-height: 1.25;
  letter-spacing: -0.02em;
}

.offer {
  margin: 18px 0 0;
  color: var(--muted);
}

.download {
  display: inline-flex;
  margin-top: 28px;
  min-height: 44px;
  padding: 0 18px;
  align-items: center;
  border-radius: 999px;
  background: var(--cyan);
  color: var(--cyan-ink);
  font-weight: 600;
  text-decoration: none;
}

.download:hover { background: #b6f3f6; }

.note {
  margin: 16px 0 0;
  max-width: 46ch;
  color: var(--muted);
  font-size: 14px;
}

.back {
  margin-top: 56px;
  padding-top: 22px;
  border-top: 1px solid var(--line);
}

.back h2 {
  margin: 0 0 8px;
  font-size: 15px;
  font-weight: 600;
}

.back p { margin: 0; max-width: 46ch; }

.back a {
  display: inline-block;
  margin-top: 10px;
  color: var(--cyan);
}

.back a:hover { color: #b6f3f6; }

:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
}