:root {
  color-scheme: light dark;
  --bg: #f5f7fb;
  --surface: #ffffff;
  --text: #1a1f2e;
  --muted: #5c6478;
  --accent: #2563eb;
  --border: #e2e8f0;
  --max: 720px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0b0f17;
    --surface: #121826;
    --text: #eef2ff;
    --muted: #9aa3b8;
    --accent: #60a5fa;
    --border: #243044;
  }
}

* {
  box-sizing: border-box;
}

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

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

header,
main,
footer {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 1.25rem;
}

header {
  padding-top: 2.5rem;
  padding-bottom: 1rem;
}

header h1 {
  margin: 0 0 0.25rem;
  font-size: 1.75rem;
}

header p {
  margin: 0;
  color: var(--muted);
}

main {
  padding-bottom: 3rem;
}

.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 1.25rem 1.5rem;
  margin: 1rem 0 1.5rem;
}

.card h2 {
  margin-top: 0;
  font-size: 1.125rem;
}

.card ul {
  margin: 0.5rem 0 0;
  padding-left: 1.25rem;
}

.app-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.app-list li {
  padding: 0.75rem 0;
  border-bottom: 1px solid var(--border);
}

.app-list li:last-child {
  border-bottom: none;
}

.app-list a {
  font-weight: 600;
  text-decoration: none;
}

.app-list span {
  display: block;
  color: var(--muted);
  font-size: 0.925rem;
  margin-top: 0.15rem;
}

article h2 {
  margin-top: 2rem;
  font-size: 1.25rem;
}

article h3 {
  margin-top: 1.5rem;
  font-size: 1.05rem;
}

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

article ul {
  padding-left: 1.25rem;
}

.meta {
  color: var(--muted);
  font-size: 0.925rem;
}

footer {
  padding-bottom: 2.5rem;
  color: var(--muted);
  font-size: 0.875rem;
}

.nav {
  margin: 1rem 0 1.5rem;
  font-size: 0.95rem;
}

.button-link {
  display: inline-block;
  margin-top: 0.5rem;
  padding: 0.65rem 1rem;
  background: var(--accent);
  color: #fff !important;
  border-radius: 8px;
  text-decoration: none;
  font-weight: 600;
}

@media (prefers-color-scheme: dark) {
  .button-link {
    color: #0b0f17 !important;
  }
}