:root {
  --bg: #fafafa;
  --fg: #2e2e2e;
  --accent: #5e81ac;
  --border: #ddd;
  --code-bg: #f0f0f0;
  --max-width: 42rem;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #1d1f21;
    --fg: #c5c8c6;
    --accent: #81a2be;
    --border: #373b41;
    --code-bg: #282a2e;
  }
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
  font-size: 1rem;
  line-height: 1.7;
  color: var(--fg);
  background: var(--bg);
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 2rem 1rem;
}

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

h1, h2, h3, h4 { margin: 1.5em 0 0.5em; line-height: 1.3; }
h1 { font-size: 1.6rem; }
h2 { font-size: 1.3rem; }
h3 { font-size: 1.1rem; }

p { margin: 0.8em 0; }
ul, ol { margin: 0.8em 0; padding-left: 1.5em; }
li { margin: 0.3em 0; }

img {
  max-width: 100%;
  height: auto;
  border-radius: 4px;
}

code {
  font-family: "Source Code Pro", "Fira Code", monospace;
  font-size: 0.9em;
  background: var(--code-bg);
  padding: 0.15em 0.3em;
  border-radius: 3px;
}

pre {
  background: var(--code-bg);
  padding: 1em;
  border-radius: 4px;
  overflow-x: auto;
  margin: 1em 0;
  border: 1px solid var(--border);
}

pre code {
  background: none;
  padding: 0;
}

hr { border: none; border-top: 1px solid var(--border); margin: 2em 0; }

blockquote {
  border-left: 3px solid var(--accent);
  padding-left: 1em;
  margin: 1em 0;
  color: var(--fg);
  opacity: 0.85;
}

/* org-mode specific */
#preamble { margin-bottom: 2rem; border-bottom: 1px solid var(--border); padding-bottom: 1rem; }
#preamble a { margin-right: 1rem; }
#postamble { margin-top: 3rem; padding-top: 1rem; border-top: 1px solid var(--border); font-size: 0.85rem; opacity: 0.6; }

.title { margin-bottom: 0.2em; }
.subtitle { font-size: 0.95rem; opacity: 0.7; margin-bottom: 1.5em; }

.org-src-container { position: relative; }

#table-of-contents { margin: 1.5em 0; }
#table-of-contents h2 { font-size: 1.1rem; }

table {
  border-collapse: collapse;
  margin: 1em 0;
  width: 100%;
}

th, td {
  border: 1px solid var(--border);
  padding: 0.5em 0.75em;
  text-align: left;
}