:root {
  color-scheme: dark;
  --bg: #f7f8f6;
  --text: #151817;
  --muted: #626b66;
  --border: #dfe4df;
  --surface: #ffffff;
  --surface-soft: #eef2ee;
  --accent: #18765e;
  --link: #0b63ce;
  --code-bg: #edf0ed;
  --shadow: 0 18px 50px rgba(20, 24, 22, 0.08);
}

* {
  box-sizing: border-box;
}

html {
  min-height: 100%;
  background: var(--bg);
}

body {
  max-width: 840px;
  margin: 0 auto;
  padding: 52px 24px 64px;
  background: var(--bg);
  color: var(--text);
  font-family: ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "SF Pro Text", "Segoe UI", sans-serif;
  font-size: 16px;
  line-height: 1.68;
  letter-spacing: 0;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

body::before {
  content: "";
  display: block;
  width: 48px;
  height: 3px;
  margin: 0 0 28px;
  border-radius: 999px;
  background: linear-gradient(90deg, var(--accent), var(--link));
}

h1,
h2,
p,
ul,
ol {
  overflow-wrap: anywhere;
}

h1 {
  margin: 0 0 18px;
  font-size: 2rem;
  line-height: 1.14;
  font-weight: 760;
  letter-spacing: 0;
}

h2 {
  margin: 42px 0 12px;
  padding-top: 22px;
  border-top: 1px solid var(--border);
  color: var(--text);
  font-size: 1.08rem;
  line-height: 1.32;
  font-weight: 720;
  letter-spacing: 0;
}

p {
  margin: 0 0 16px;
}

body > p:first-of-type {
  margin: 0 0 38px;
  padding: 14px 16px;
  border: 1px solid var(--border);
  border-left: 3px solid var(--accent);
  border-radius: 8px;
  background: var(--surface);
  box-shadow: var(--shadow);
  color: var(--muted);
}

ul,
ol {
  margin: 0 0 18px;
  padding-left: 1.25rem;
}

li + li {
  margin-top: 8px;
}

a {
  color: var(--link);
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

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

strong {
  color: var(--text);
  font-weight: 720;
}

code {
  padding: 2px 6px;
  border: 1px solid var(--border);
  border-radius: 5px;
  background: var(--code-bg);
  color: var(--text);
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: 0.92em;
}

.lang-switch {
  float: right;
  margin: 0 0 18px 24px;
  font-size: 0.94rem;
}

.lang-switch a {
  display: inline-flex;
  min-height: 36px;
  align-items: center;
  padding: 0 13px;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: var(--surface);
  color: var(--text);
  text-decoration: none;
  box-shadow: 0 8px 28px rgba(20, 24, 22, 0.06);
}

.lang-switch a:hover {
  border-color: var(--accent);
  color: var(--accent);
}

footer {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 14px;
  margin-top: 56px;
  padding-top: 20px;
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 0.94rem;
}

footer a {
  color: inherit;
}

@media (max-width: 640px) {
  body {
    padding: 30px 18px 48px;
  }

  .lang-switch {
    float: none;
    display: block;
    margin: 0 0 24px;
  }

  h1 {
    font-size: 1.7rem;
  }
}

:root {
  color-scheme: dark;
  --bg: #101312;
  --text: #f3f5f1;
  --muted: #aeb8b2;
  --border: #2b3530;
  --surface: #171c1a;
  --surface-soft: #202824;
  --accent: #77d8b4;
  --link: #8fc7ff;
  --code-bg: #222a26;
  --shadow: 0 18px 50px rgba(0, 0, 0, 0.28);
}