:root {
  color-scheme: dark;
  --bg: #0e1417;
  --panel: rgba(255, 255, 255, 0.05);
  --panel-strong: rgba(255, 255, 255, 0.08);
  --text: #f4f7f8;
  --muted: rgba(244, 247, 248, 0.74);
  --border: rgba(255, 255, 255, 0.1);
  --accent: #26c281;
  --accent-soft: rgba(38, 194, 129, 0.14);
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  background:
    radial-gradient(circle at top left, rgba(38, 194, 129, 0.18), transparent 32%),
    radial-gradient(circle at top right, rgba(74, 144, 226, 0.16), transparent 26%),
    var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

.shell {
  width: min(920px, calc(100vw - 32px));
  margin: 0 auto;
  padding: 40px 0 64px;
}

.topnav {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 20px;
}

.topnav a {
  text-decoration: none;
  color: var(--text);
  font-size: 13px;
  font-weight: 700;
  padding: 10px 14px;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.03);
}

.topnav a.active {
  background: var(--accent-soft);
  color: var(--accent);
  border-color: rgba(38, 194, 129, 0.28);
}

.hero,
.section {
  border: 1px solid var(--border);
  border-radius: 24px;
  background: var(--panel);
}

.hero {
  padding: 28px;
  margin-bottom: 18px;
}

.eyebrow {
  margin: 0 0 10px;
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 1px;
  text-transform: uppercase;
  color: var(--accent);
}

h1 {
  margin: 0;
  font-size: 2rem;
  line-height: 1.15;
}

.hero p,
.section p,
.section li,
.notice {
  color: var(--muted);
  line-height: 1.72;
}

.stack {
  display: grid;
  gap: 14px;
}

.section {
  padding: 22px;
}

.section h2 {
  margin: 0 0 12px;
  font-size: 1.05rem;
}

ul {
  margin: 12px 0 0;
  padding-left: 18px;
}

.notice {
  margin-top: 18px;
  padding: 16px 18px;
  border-radius: 18px;
  border: 1px solid var(--border);
  background: var(--panel-strong);
  font-size: 14px;
}

.footer {
  margin-top: 18px;
  color: var(--muted);
  font-size: 13px;
}

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