:root {
  color-scheme: dark;

  --bg-0: #0f0f1e;
  --bg-1: #1a1a2e;
  --bg-2: #16213e;
  --surface: rgb(20 20 35 / 75%);
  --surface-strong: rgb(30 30 45 / 90%);
  --border: rgb(255 255 255 / 8%);
  --ink: rgb(255 255 255 / 90%);
  --muted: rgb(255 255 255 / 60%);
  --accent: #00d9ff;
  --accent-2: #6366f1;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
  color: var(--ink);
  background: radial-gradient(circle at top left, rgb(0 217 255 / 8%), transparent 45%),
    linear-gradient(135deg, var(--bg-1), var(--bg-0) 45%, var(--bg-2));
  line-height: 1.6;
}

header {
  padding: 32px 24px 12px;
  border-bottom: 1px solid var(--border);
  background: linear-gradient(135deg, rgb(99 102 241 / 12%), transparent 65%);
}

.header__inner {
  max-width: 920px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

header h1 {
  margin: 0;
  font-size: clamp(2rem, 2vw + 1.4rem, 2.8rem);
  letter-spacing: 0.03em;
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  background-clip: text;
  color: transparent;
}

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

nav {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  font-size: 0.95rem;
  letter-spacing: 0.03em;
  text-transform: uppercase;
}

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

nav a:hover {
  text-decoration: underline;
}

main {
  max-width: 920px;
  margin: 0 auto;
  padding: 28px 24px 80px;
  display: grid;
  gap: 24px;
}

.section {
  padding: 18px 20px;
  background: var(--surface);
  border-radius: 16px;
  border: 1px solid var(--border);
  box-shadow: 0 16px 32px rgb(9 10 24 / 35%);
  backdrop-filter: blur(14px);
}

.section h2 {
  margin-top: 0;
  color: var(--accent);
}

.section h3 {
  margin-bottom: 6px;
  color: var(--accent-2);
}

.section ul {
  padding-left: 20px;
}

.section li {
  margin-bottom: 8px;
}

footer {
  border-top: 1px solid var(--border);
  padding: 24px;
  text-align: center;
  color: var(--muted);
  font-size: 0.9rem;
}

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

footer a:hover {
  text-decoration: underline;
}

.notice {
  font-size: 0.95rem;
  color: var(--muted);
}

@media (width <= 720px) {
  header {
    padding: 28px 18px 12px;
  }

  main {
    padding: 24px 18px 64px;
  }
}