:root {
  --paper: #f3f5fb;
  --surface: #ffffff;
  --ink: #0f1424;
  --muted: #5d6477;
  --hairline: rgba(15, 20, 36, 0.09);
  --accent: #1f6bff;
  --accent-soft: rgba(31, 107, 255, 0.08);
}

@media (prefers-color-scheme: dark) {
  :root {
    --paper: #05070d;
    --surface: #111522;
    --ink: #f2f4fa;
    --muted: #a3aabb;
    --hairline: rgba(242, 244, 250, 0.1);
    --accent: #4c8dff;
    --accent-soft: rgba(76, 141, 255, 0.12);
  }
}

* { box-sizing: border-box; margin: 0; padding: 0; }

body {
  background: var(--paper);
  color: var(--ink);
  font: 17px/1.65 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
}

.wrap { max-width: 720px; margin: 0 auto; padding: 56px 20px 96px; }

h1, h2 { font-weight: 750; letter-spacing: -0.02em; line-height: 1.2; }
h1 { font-size: 40px; margin: 20px 0 6px; }
h2 { font-size: 23px; margin: 40px 0 10px; }
h3 { font-size: 17px; margin: 24px 0 6px; }
p + p { margin-top: 12px; }
ul { padding-left: 22px; margin-top: 8px; }
li { margin: 6px 0; }
a { color: var(--accent); }
strong { font-weight: 650; }

.back { font-weight: 600; font-size: 15px; text-decoration: none; }
.meta { color: var(--muted); font-size: 14px; }

.callout {
  background: var(--accent-soft);
  border-radius: 18px;
  padding: 18px 20px;
  margin: 28px 0 8px;
}

.card {
  background: var(--surface);
  border: 1px solid var(--hairline);
  border-radius: 18px;
  padding: 18px 20px;
  margin-top: 12px;
}

.hero { text-align: center; padding-top: 40px; }
.hero img { width: 112px; height: 112px; border-radius: 26px; box-shadow: 0 16px 40px rgba(31, 107, 255, 0.28); }
.hero h1 { font-size: 48px; }
.hero .tag { color: var(--muted); font-size: 19px; max-width: 520px; margin: 8px auto 0; }

.links { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; margin-top: 36px; }
.btn {
  display: inline-block;
  padding: 13px 22px;
  border-radius: 999px;
  font-weight: 600;
  text-decoration: none;
  background: var(--surface);
  color: var(--ink);
  border: 1px solid var(--hairline);
}
.btn.primary { background: var(--accent); color: #fff; border-color: transparent; }

.points { display: grid; gap: 12px; margin-top: 48px; }
.points .card h3 { margin-top: 0; }
.points .card p { color: var(--muted); }

footer {
  color: var(--muted);
  font-size: 14px;
  margin-top: 64px;
  padding-top: 20px;
  border-top: 1px solid var(--hairline);
}
footer a { color: var(--muted); }

@media (max-width: 480px) {
  h1 { font-size: 32px; }
  .hero h1 { font-size: 40px; }
}