:root {
  font-family: "Helvetica Neue", Helvetica, Arial, system-ui, sans-serif;
  color-scheme: light dark;

  --bg: light-dark(#f5f5f2, #1b1d20);
  --text: light-dark(#1f1f1f, #ededeb);
  --text-secondary: light-dark(#6b6e73, #a7a9ad);
  --border: light-dark(#dadada, #34383c);
  --accent: light-dark(#2f5d8c, #4a78a8);
  --accent-muted: #6b7f5a;
}

:root[data-theme="light"] {
  color-scheme: light;
}

:root[data-theme="dark"] {
  color-scheme: dark;
}

* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
}

header,
main,
footer {
  max-width: 860px;
  margin: 0 auto;
  padding: 1.5rem 1.75rem;
}

header {
  border-bottom: 1px solid var(--border);
}

nav {
  display: flex;
  gap: 1.5rem;
  font-size: 0.95rem;
}

nav a {
  color: var(--text-secondary);
  text-decoration: none;
}

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

h1,
h2,
h3 {
  margin: 0 0 0.75rem;
  font-weight: 500;
  letter-spacing: 0.02em;
}

p {
  margin: 0 0 1.2rem;
}

.meta {
  color: var(--text-secondary);
  font-size: 0.95rem;
}

.divider {
  border-top: 1px solid var(--border);
  margin: 2.5rem 0;
}

a {
  color: var(--accent);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

.grid {
  display: grid;
  gap: 2rem;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
}

.card {
  border: 1px solid var(--border);
  padding: 1.5rem;
}

.tag {
  display: inline-block;
  padding: 0.15rem 0.6rem;
  border: 1px solid var(--border);
  color: var(--text-secondary);
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 0.75rem;
}

footer {
  border-top: 1px solid var(--border);
  color: var(--text-secondary);
  font-size: 0.9rem;
  text-align: right;
}

.accent-block {
  border-left: 3px solid var(--accent);
  padding-left: 1rem;
  color: var(--text-secondary);
}

.muted-link {
  color: var(--accent-muted);
}

p.theme-selector {
  color: var(--text-secondary);
  font-size: 0.9rem;
  margin: 1.5rem 0 0;
}

p.theme-selector input {
  display: none;
}

p.theme-selector label {
  cursor: pointer;
  margin: 0;
  text-decoration: none;
}

p.theme-selector label:hover {
  text-decoration: underline;
}

p.theme-selector input:checked + span {
  text-decoration: underline;
}