:root {
  --bg: #1b1f23;
  --panel: #242a30;
  --input: #2d343b;
  --border: #3a434c;
  --text: #e6e6e6;
  --muted: #8f9aa5;
  --accent: #23b3c5;
  --on-accent: #000000;
}

* {
  box-sizing: border-box;
}

html {
  background: var(--bg);
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: "Segoe UI", system-ui, -apple-system, Roboto, Arial, sans-serif;
  line-height: 1.6;
}

main {
  max-width: 760px;
  margin: 0 auto;
  padding: 32px 16px 64px;
}

h1 {
  font-size: 1.9rem;
  margin: 0 0 8px;
}

h2 {
  font-size: 1.25rem;
  margin: 40px 0 12px;
  padding-bottom: 6px;
  border-bottom: 1px solid var(--border);
}

p {
  margin: 0 0 12px;
}

.lead {
  color: var(--muted);
  font-size: 1.05rem;
}

.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px, 1fr));
  gap: 12px;
  margin-top: 16px;
}

.card {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 18px;
}

.card h3 {
  margin: 0 0 4px;
  font-size: 1.05rem;
}

.card .meta {
  color: var(--muted);
  font-size: 0.9rem;
  margin-bottom: 14px;
}

.button {
  display: inline-block;
  background: var(--accent);
  color: var(--on-accent);
  text-decoration: none;
  font-weight: 600;
  padding: 10px 18px;
  border-radius: 8px;
}

.button:hover {
  filter: brightness(1.1);
}

ol,
ul {
  padding-left: 22px;
  margin: 0 0 12px;
}

li {
  margin-bottom: 8px;
}

code,
kbd {
  background: var(--input);
  border: 1px solid var(--border);
  border-radius: 4px;
  padding: 1px 6px;
  font-family: Consolas, "Courier New", monospace;
  font-size: 0.92em;
}

.note {
  background: var(--panel);
  border-left: 4px solid var(--accent);
  border-radius: 6px;
  padding: 12px 16px;
  margin: 16px 0;
}

details {
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 10px 16px;
  margin-bottom: 8px;
}

summary {
  cursor: pointer;
  font-weight: 600;
}

details p {
  margin: 10px 0 2px;
  color: var(--muted);
}

footer {
  margin-top: 48px;
  color: var(--muted);
  font-size: 0.85rem;
}

@media (max-width: 480px) {
  h1 {
    font-size: 1.5rem;
  }
}