:root {
  --bg: #0f1f24;
  --panel: #142a30;
  --text: #f4f7f7;
  --muted: #b8c5c8;
  --accent: #5fd0c8;
  --line: rgba(255,255,255,0.12);
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: Arial, Helvetica, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.55;
}
header, main, footer {
  width: min(920px, calc(100% - 32px));
  margin: 0 auto;
}
header {
  padding: 32px 0 20px;
  border-bottom: 1px solid var(--line);
}
.brand {
  font-size: 28px;
  font-weight: 700;
  letter-spacing: -0.02em;
}
.sub {
  color: var(--muted);
  margin-top: 4px;
}
nav {
  margin-top: 20px;
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
}
nav a, main a {
  color: var(--accent);
  text-decoration: none;
}
nav a:hover, main a:hover { text-decoration: underline; }
main {
  padding: 40px 0;
}
.card {
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 18px;
  padding: 28px;
}
h1 {
  font-size: 42px;
  line-height: 1.1;
  margin: 0 0 16px;
}
h2 {
  margin-top: 32px;
}
p, li {
  color: var(--muted);
}
strong {
  color: var(--text);
}
footer {
  padding: 24px 0 40px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 14px;
}
.small {
  font-size: 14px;
  color: var(--muted);
}