:root {
  --bg: white;
  --card-bg: white;
  --text: black;
  --text-light: #444;
  --accent: #0a3a8c;
  --border: #e5e5e5;
  --hover-bg: #f3f6ff;
  --date-bg: #eaf0ff;
  --date-border: #cdd9ff;
  --code-bg: #f5f5f7;
}

body {
  margin: 0;
  padding: 20px;
  max-width: 900px;
  margin-inline: auto;
  font-family: "Segoe UI", Arial, sans-serif;
  line-height: 1.6;
  color: var(--text);
  background: var(--bg);
}

h1 {
  margin-bottom: 24px;
  font-size: 2rem;
}

article {
  margin: 18px 0;
  padding: 20px;
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 10px;
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.06);
}

article h2 {
  margin: 0 0 14px;
  display: inline-block;
  padding: 6px 12px;
  font-size: 1rem;
  font-weight: 600;
  background: var(--date-bg);
  border: 1px solid var(--date-border);
  border-radius: 20px;
}

article h3 {
  margin: 16px 0 8px;
  padding-left: 8px;
  font-size: 1.05rem;
  border-left: 3px solid var(--accent);
}

article ul,
article ol {
  margin: 8px 0 12px 22px;
  padding: 0;
}

article li {
  margin: 6px 0;
}

article code {
  padding: 2px 6px;
  font-size: 0.9rem;
  font-family: Consolas, monospace;
  background: var(--code-bg);
  border: 1px solid var(--border);
  border-radius: 4px;
}

article img {
  width: 100%;
  height: auto;
  margin: 12px 0;
  border-radius: 8px;
}

a {
  color: var(--text);
  text-decoration: underline;
  text-underline-offset: 3px;
}

a:hover {
  background: var(--hover-bg);
}

@media (max-width: 600px) {
  body {
    padding: 16px;
  }

  h1 {
    font-size: 1.7rem;
  }

  article {
    padding: 16px;
  }
}

/* dark mode  */
@media (prefers-color-scheme: dark) {
  :root {
    --bg: black;
    --card-bg: black;
    --text: white;
    --text-light: #cccccc;
    --accent: white;
    --border: #222;
    --hover-bg: #111;
    --date-bg: black;
    --date-border: white;
    --code-bg: black;
  }
}