:root {
  color-scheme: dark;
  --bg: #070a12;
  --panel: #111827;
  --panel-soft: #172033;
  --text: #f8fafc;
  --muted: #a9b3c7;
  --accent: #ff3b30;
  --accent-soft: #ff6b62;
  --line: rgba(255, 255, 255, 0.1);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background:
    radial-gradient(circle at 85% 5%, rgba(255, 59, 48, 0.17), transparent 30rem),
    var(--bg);
  color: var(--text);
  line-height: 1.7;
}

a { color: #8cc8ff; }

.wrap {
  width: min(960px, calc(100% - 32px));
  margin: 0 auto;
}

header {
  border-bottom: 1px solid var(--line);
  background: rgba(7, 10, 18, 0.88);
  backdrop-filter: blur(14px);
  position: sticky;
  top: 0;
  z-index: 2;
}

nav {
  min-height: 68px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
}

.brand {
  color: var(--text);
  text-decoration: none;
  font-weight: 900;
  letter-spacing: -0.03em;
}

.nav-links { display: flex; gap: 18px; }
.nav-links a { color: var(--muted); text-decoration: none; font-weight: 700; }

main { padding: 72px 0 88px; }

.hero { padding: 54px 0 64px; }
.eyebrow { color: var(--accent-soft); font-weight: 900; letter-spacing: 0.08em; }
h1 { font-size: clamp(2.5rem, 7vw, 5.2rem); line-height: 1.05; letter-spacing: -0.055em; margin: 12px 0 24px; }
h2 { margin-top: 0; font-size: 1.55rem; }
h3 { margin-bottom: 6px; }
.lead { max-width: 700px; color: var(--muted); font-size: 1.18rem; }

.button {
  display: inline-flex;
  margin-top: 22px;
  padding: 14px 22px;
  border-radius: 999px;
  background: var(--accent);
  color: white;
  font-weight: 900;
  text-decoration: none;
}

.grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

.card, .content {
  background: linear-gradient(145deg, var(--panel-soft), var(--panel));
  border: 1px solid var(--line);
  border-radius: 22px;
  padding: 28px;
}

.step { color: var(--accent-soft); font-size: 2rem; font-weight: 950; }
.content { max-width: 820px; }
.content section + section { margin-top: 42px; padding-top: 34px; border-top: 1px solid var(--line); }
.content p, .content li, .card p { color: var(--muted); }

.notice {
  margin-top: 34px;
  padding: 18px 20px;
  border-left: 4px solid var(--accent);
  background: rgba(255, 59, 48, 0.08);
  color: var(--muted);
}

footer { border-top: 1px solid var(--line); color: var(--muted); padding: 30px 0 48px; }
footer .wrap { display: flex; justify-content: space-between; gap: 20px; flex-wrap: wrap; }

@media (max-width: 720px) {
  .grid { grid-template-columns: 1fr; }
  .nav-links { gap: 12px; font-size: 0.88rem; }
  main { padding-top: 38px; }
  .hero { padding-top: 24px; }
}