/* ===== Base ===== */
:root {
  --text-main: #222;
  --text-sub: #555;
  --border: #e5e5e5;
  --bg: #ffffff;
  --accent: #111;
}

@media (prefers-color-scheme: dark) {
  :root {
    --text-main: #eee;
    --text-sub: #bbb;
    --border: #333;
    --bg: #121212;
    --accent: #fff;
  }
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI",
    Roboto, "Helvetica Neue", Arial, sans-serif;
  color: var(--text-main);
  line-height: 1.9;
  max-width: 880px;
  margin: 48px auto;
  padding: 0 20px 80px;
}

/* ===== Headings ===== */
h1 {
  font-size: 2rem;
  margin-bottom: 0.5em;
  letter-spacing: 0.02em;
}

h2 {
  font-size: 1.25rem;
  margin-top: 2.5em;
  margin-bottom: 0.6em;
  padding-top: 0.3em;
  border-top: 1px solid var(--border);
}

h3 {
  font-size: 1.05rem;
  margin-top: 2em;
}

/* ===== Text ===== */
p {
  margin: 0.6em 0;
  color: var(--text-main);
}

ul {
  padding-left: 1.4em;
  margin: 0.6em 0;
}

li {
  margin: 0.4em 0;
}

/* ===== Meta ===== */
.meta {
  color: var(--text-sub);
  font-size: 0.9rem;
  margin-bottom: 2em;
}

/* ===== Divider ===== */
hr {
  border: none;
  border-top: 1px solid var(--border);
  margin: 64px 0;
}

/* ===== English Section ===== */
.en {
  margin-top: 80px;
  padding-top: 64px;
  border-top: 2px solid var(--border);
}