:root {
  --bg: #0f1117;
  --card: #171b24;
  --text: #f4f6fb;
  --muted: #a9b2c3;
  --line: #2a3140;
  --accent: #8fd3ff;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: Arial, Helvetica, sans-serif;
  background: radial-gradient(circle at top left, #1c2740 0, #0f1117 42%);
  color: var(--text);
  line-height: 1.6;
}

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

a:hover {
  text-decoration: underline;
}

header {
  padding: 28px 20px;
  border-bottom: 1px solid var(--line);
  background: rgba(15, 17, 23, 0.88);
  position: sticky;
  top: 0;
  backdrop-filter: blur(12px);
}

.nav {
  max-width: 980px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  gap: 16px;
  align-items: center;
  flex-wrap: wrap;
}

.brand {
  font-weight: 800;
  letter-spacing: 0.4px;
  font-size: 20px;
}

nav {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

nav a {
  color: var(--text);
  opacity: 0.9;
  font-size: 15px;
}

main {
  max-width: 980px;
  margin: 0 auto;
  padding: 52px 20px;
}

.hero {
  padding: 38px 0 42px;
}

.kicker {
  color: var(--accent);
  font-weight: 700;
  margin-bottom: 10px;
}

h1 {
  font-size: clamp(34px, 7vw, 62px);
  line-height: 1.05;
  margin: 0 0 18px;
}

h2 {
  font-size: 28px;
  margin: 0 0 16px;
}

p {
  color: var(--muted);
  margin: 0 0 16px;
}

.hero p {
  max-width: 720px;
  font-size: 18px;
}

.buttons {
  display: flex;
  gap: 12px;
  margin-top: 26px;
  flex-wrap: wrap;
}

.button {
  display: inline-block;
  padding: 12px 16px;
  border-radius: 14px;
  border: 1px solid var(--line);
  background: var(--card);
  color: var(--text);
  font-weight: 700;
}

.button.primary {
  background: var(--accent);
  color: #06111a;
  border-color: var(--accent);
}

section {
  margin: 54px 0;
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  gap: 16px;
}

.card {
  background: rgba(23, 27, 36, 0.9);
  border: 1px solid var(--line);
  border-radius: 22px;
  padding: 20px;
}

.card h3 {
  margin: 0 0 10px;
  font-size: 20px;
}

.badge {
  display: inline-block;
  margin-top: 10px;
  padding: 6px 10px;
  border-radius: 999px;
  background: rgba(143, 211, 255, 0.12);
  color: var(--accent);
  font-size: 13px;
  font-weight: 700;
}

footer {
  border-top: 1px solid var(--line);
  padding: 26px 20px;
  color: var(--muted);
}

.footer-inner {
  max-width: 980px;
  margin: 0 auto;
  font-size: 14px;
}

.notice {
  background: rgba(143, 211, 255, 0.08);
  border: 1px solid rgba(143, 211, 255, 0.25);
  border-radius: 18px;
  padding: 16px;
}

@media (max-width: 640px) {
  header {
    position: static;
  }

  .nav {
    align-items: flex-start;
  }

  nav {
    width: 100%;
  }

  .buttons {
    flex-direction: column;
  }

  .button {
    text-align: center;
  }
}