:root {
  --bg: #0f172a;
  --surface: #1e293b;
  --text: #e2e8f0;
  --muted: #94a3b8;
  --accent: #6ea8fe;
  --border: rgba(110, 168, 254, 0.2);
  --max-width: 720px;
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  background: linear-gradient(180deg, var(--bg) 0%, #020617 100%);
  color: var(--text);
  line-height: 1.7;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}

header {
  border-bottom: 1px solid var(--border);
  padding: 24px 0;
  background: rgba(15, 23, 42, 0.85);
  backdrop-filter: blur(12px);
  position: sticky;
  top: 0;
  z-index: 10;
}

header .container {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  color: var(--text);
  font-weight: 600;
  font-size: 17px;
}

.brand-mark {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: radial-gradient(circle at center, var(--accent) 0%, var(--bg) 70%);
  border: 2px solid var(--accent);
  flex-shrink: 0;
}

nav {
  display: flex;
  gap: 20px;
  flex-wrap: wrap;
}

nav a {
  color: var(--muted);
  text-decoration: none;
  font-size: 14px;
  font-weight: 500;
  transition: color 0.15s ease;
}

nav a:hover,
nav a.active {
  color: var(--accent);
}

.container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}

main {
  padding: 56px 0 96px;
}

main h1 {
  font-size: 36px;
  font-weight: 700;
  margin-bottom: 8px;
  color: white;
  letter-spacing: -0.02em;
}

main .updated {
  color: var(--muted);
  font-size: 14px;
  margin-bottom: 40px;
}

main h2 {
  font-size: 22px;
  font-weight: 600;
  color: white;
  margin-top: 40px;
  margin-bottom: 16px;
  letter-spacing: -0.01em;
}

main h3 {
  font-size: 17px;
  font-weight: 600;
  color: var(--text);
  margin-top: 28px;
  margin-bottom: 12px;
}

main p {
  margin-bottom: 16px;
  color: var(--text);
}

main ul,
main ol {
  margin: 0 0 16px 24px;
  color: var(--text);
}

main li {
  margin-bottom: 8px;
}

main a {
  color: var(--accent);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 0.15s ease;
}

main a:hover {
  border-bottom-color: var(--accent);
}

.hero {
  text-align: center;
  padding: 80px 0 64px;
}

.hero h1 {
  font-size: 56px;
  font-weight: 700;
  letter-spacing: -0.03em;
  margin-bottom: 16px;
  color: white;
}

.hero p {
  font-size: 19px;
  color: var(--muted);
  max-width: 560px;
  margin: 0 auto;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 24px;
  margin: 56px 0;
}

.feature {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 24px;
}

.feature h3 {
  margin-top: 0;
  margin-bottom: 8px;
  color: var(--accent);
  font-size: 16px;
}

.feature p {
  color: var(--muted);
  font-size: 15px;
  margin-bottom: 0;
}

.cta {
  text-align: center;
  margin: 64px 0;
}

.cta a {
  display: inline-block;
  background: var(--accent);
  color: var(--bg);
  padding: 14px 28px;
  border-radius: 999px;
  font-weight: 600;
  text-decoration: none;
  font-size: 16px;
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.cta a:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(110, 168, 254, 0.3);
}

.contact-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 24px;
  margin: 24px 0;
}

.contact-card strong {
  display: block;
  color: white;
  margin-bottom: 4px;
  font-size: 15px;
}

.contact-card span {
  color: var(--muted);
  font-size: 14px;
}

footer {
  border-top: 1px solid var(--border);
  padding: 32px 0;
  color: var(--muted);
  font-size: 13px;
  text-align: center;
}

footer p {
  margin: 0;
}

footer a {
  color: var(--muted);
  text-decoration: none;
  margin: 0 12px;
}

footer a:hover {
  color: var(--accent);
}

@media (max-width: 640px) {
  .hero h1 {
    font-size: 40px;
  }
  main h1 {
    font-size: 28px;
  }
  nav {
    gap: 14px;
  }
  nav a {
    font-size: 13px;
  }
}