:root {
  color-scheme: dark;
  --bg: #080d13;
  --panel: #101821;
  --panel-soft: #162331;
  --text: #f1f7fb;
  --muted: #aab6c3;
  --line: #2b4258;
  --accent: #26d8e8;
  --warm: #ffad2f;
  --good: #43d184;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background:
    radial-gradient(circle at top left, rgba(38, 216, 232, 0.20), transparent 28rem),
    linear-gradient(180deg, #0b1118 0%, #070a0f 100%);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.62;
}

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

.shell {
  width: min(920px, calc(100% - 32px));
  margin: 0 auto;
  padding: 32px 0 56px;
}

.nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 14px 0 24px;
}

.brand {
  color: var(--text);
  font-weight: 750;
  text-decoration: none;
}

.links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.links a {
  color: var(--muted);
  text-decoration: none;
}

.hero,
.content {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: rgba(16, 24, 33, 0.92);
  padding: 24px;
}

.hero h1,
.content h1 {
  margin: 0 0 8px;
  font-size: clamp(2rem, 6vw, 3.3rem);
  line-height: 1.05;
  letter-spacing: 0;
}

.content h1 {
  font-size: clamp(2rem, 5vw, 2.8rem);
}

.lede,
.effective,
.footer {
  color: var(--muted);
}

.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 12px;
  margin-top: 18px;
}

.card {
  display: block;
  min-height: 132px;
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--panel-soft);
  color: var(--text);
  text-decoration: none;
}

.card strong {
  display: block;
  margin-bottom: 6px;
}

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

.notice {
  border-left: 4px solid var(--warm);
  color: var(--muted);
  margin-top: 18px;
  padding: 10px 14px;
  background: rgba(255, 173, 47, 0.08);
}

h2 {
  margin-top: 32px;
  border-top: 1px solid var(--line);
  padding-top: 22px;
}

h3 {
  margin-top: 24px;
}

li + li {
  margin-top: 6px;
}

.footer {
  font-size: 0.94rem;
  padding-top: 18px;
}

@media (max-width: 620px) {
  .nav {
    align-items: flex-start;
    flex-direction: column;
  }

  .hero,
  .content {
    padding: 18px;
  }
}