:root {
  color-scheme: dark;
  --background: #040713;
  --surface: #10162a;
  --surface-soft: #151d35;
  --text: #f7f8ff;
  --muted: #a8b0c8;
  --cyan: #16d9f5;
  --violet: #8b5cf6;
  --magenta: #f13fe3;
  --border: rgba(255, 255, 255, 0.11);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: Inter, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background:
    radial-gradient(circle at 15% 10%, rgba(22, 217, 245, 0.13), transparent 28rem),
    radial-gradient(circle at 85% 15%, rgba(241, 63, 227, 0.11), transparent 26rem),
    var(--background);
  color: var(--text);
  line-height: 1.65;
}

a {
  color: var(--cyan);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

.container {
  width: min(920px, calc(100% - 36px));
  margin: 0 auto;
}

.site-header {
  padding: 28px 0;
  border-bottom: 1px solid var(--border);
  backdrop-filter: blur(18px);
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
}

.brand {
  color: var(--text);
  font-size: 20px;
  font-weight: 900;
  letter-spacing: -0.5px;
}

.nav-links {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
}

.nav-links a {
  color: var(--muted);
  font-weight: 700;
}

.hero {
  padding: 86px 0 46px;
}

.hero h1 {
  max-width: 760px;
  margin: 0;
  font-size: clamp(42px, 8vw, 76px);
  line-height: 0.98;
  letter-spacing: -3px;
}

.hero p {
  max-width: 680px;
  margin-top: 24px;
  color: var(--muted);
  font-size: 19px;
}

.badge {
  display: inline-flex;
  padding: 8px 14px;
  margin-bottom: 22px;
  border: 1px solid rgba(22, 217, 245, 0.25);
  border-radius: 999px;
  background: rgba(22, 217, 245, 0.08);
  color: var(--cyan);
  font-size: 13px;
  font-weight: 800;
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 18px;
  padding: 26px 0 74px;
}

.card {
  padding: 24px;
  border: 1px solid var(--border);
  border-radius: 24px;
  background:
    linear-gradient(145deg, rgba(255,255,255,0.08), rgba(255,255,255,0.025)),
    var(--surface);
  box-shadow: 0 24px 70px rgba(0, 0, 0, 0.25);
}

.card h2,
.card h3 {
  margin-top: 0;
}

.card p {
  color: var(--muted);
}

.page {
  padding: 54px 0 84px;
}

.page h1 {
  font-size: clamp(36px, 7vw, 58px);
  line-height: 1;
  letter-spacing: -2px;
}

.page h2 {
  margin-top: 42px;
}

.page p,
.page li {
  color: var(--muted);
}

.notice {
  padding: 18px;
  margin: 22px 0;
  border-left: 3px solid var(--cyan);
  border-radius: 14px;
  background: rgba(22, 217, 245, 0.07);
}

.button {
  display: inline-flex;
  padding: 13px 18px;
  border-radius: 16px;
  background: linear-gradient(90deg, var(--cyan), var(--violet), var(--magenta));
  color: white;
  font-weight: 900;
}

.button:hover {
  text-decoration: none;
  filter: brightness(1.08);
}

footer {
  padding: 34px 0;
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 14px;
}

@media (max-width: 650px) {
  .nav {
    align-items: flex-start;
    flex-direction: column;
  }

  .hero {
    padding-top: 58px;
  }

  .hero h1 {
    letter-spacing: -2px;
  }
}