:root {
  color-scheme: dark;
  --bg: #061f2b;
  --panel: #0b3445;
  --panel2: #0e4257;
  --text: #dff7ff;
  --muted: #9bc9d8;
  --accent: #22c7ff;
  --line: rgba(97, 206, 242, 0.28);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background:
    radial-gradient(circle at top, rgba(34,199,255,.12), transparent 35rem),
    var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Arial, sans-serif;
  line-height: 1.7;
}

header {
  border-bottom: 1px solid var(--line);
  background: rgba(6,31,43,.92);
}

nav {
  width: min(960px, calc(100% - 32px));
  margin: auto;
  padding: 18px 0;
  display: flex;
  gap: 18px;
  align-items: center;
  flex-wrap: wrap;
}

.brand {
  margin-right: auto;
  font-size: 1.2rem;
  font-weight: 800;
  color: white;
}

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

a:hover {
  text-decoration: underline;
}

main {
  width: min(900px, calc(100% - 32px));
  margin: 48px auto 80px;
}

.hero {
  padding: 40px;
  border: 1px solid var(--line);
  border-radius: 28px;
  background: linear-gradient(145deg, rgba(14,66,87,.92), rgba(8,42,57,.94));
  box-shadow: 0 24px 80px rgba(0,0,0,.25);
}

h1 {
  margin: 0 0 12px;
  color: white;
  font-size: clamp(2rem, 6vw, 3.5rem);
  line-height: 1.1;
}

h2 {
  color: white;
  margin-top: 2.2rem;
}

h3 {
  color: white;
}

p, li {
  color: var(--text);
}

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

.cards {
  margin-top: 28px;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px,1fr));
  gap: 16px;
}

.card {
  display: block;
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: 22px;
  background: var(--panel);
}

.card strong {
  display: block;
  color: white;
  font-size: 1.15rem;
  margin-bottom: 6px;
}

section {
  padding: 6px 0;
}

.notice {
  padding: 18px 20px;
  border-left: 4px solid var(--accent);
  background: rgba(34,199,255,.08);
  border-radius: 10px;
}

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

footer div {
  width: min(900px, calc(100% - 32px));
  margin: auto;
  padding: 30px 0;
}