:root {
  --brand-1: #6366f1;
  --brand-2: #8b5cf6;
  --ink: #1f2430;
  --muted: #5b6472;
  --bg: #ffffff;
  --card: #f7f7fb;
  --border: #e6e6ef;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  color: var(--ink);
  background: var(--bg);
  line-height: 1.6;
}

header.hero {
  background: linear-gradient(135deg, var(--brand-1), var(--brand-2));
  color: #fff;
  padding: 56px 20px;
  text-align: center;
}

header.hero .mark {
  width: 84px; height: 84px;
  display: inline-flex; align-items: center; justify-content: center;
  border-radius: 20px;
  background: rgba(255,255,255,0.15);
  margin-bottom: 16px;
}

header.hero h1 { margin: 0; font-size: 2.2rem; }
header.hero p { margin: 8px 0 0; opacity: 0.92; font-size: 1.1rem; }

nav {
  display: flex; gap: 8px; justify-content: center; flex-wrap: wrap;
  padding: 16px; border-bottom: 1px solid var(--border);
  position: sticky; top: 0; background: var(--bg); z-index: 10;
}
nav a {
  text-decoration: none; color: var(--brand-1); font-weight: 600;
  padding: 8px 14px; border-radius: 999px;
}
nav a:hover { background: var(--card); }

main {
  max-width: 760px; margin: 0 auto; padding: 32px 20px 64px;
}

main h2 { margin-top: 40px; font-size: 1.5rem; }
main h3 { margin-top: 28px; font-size: 1.15rem; }
main p, main li { color: var(--ink); }
main .muted { color: var(--muted); font-size: 0.95rem; }

.card {
  background: var(--card); border: 1px solid var(--border);
  border-radius: 14px; padding: 20px 24px; margin: 20px 0;
}

.features { list-style: none; padding: 0; }
.features li { padding: 10px 0; border-bottom: 1px solid var(--border); }
.features li:last-child { border-bottom: none; }

a.button {
  display: inline-block; background: #fff; color: var(--brand-1);
  padding: 12px 22px; border-radius: 999px; font-weight: 700;
  text-decoration: none; margin-top: 18px;
}

footer {
  border-top: 1px solid var(--border); padding: 28px 20px;
  text-align: center; color: var(--muted); font-size: 0.9rem;
}
footer a { color: var(--brand-1); }