:root {
  --bg: #f4f6f8;
  --surface: #ffffff;
  --text: #1f2328;
  --muted: #5b6672;
  --border: #e2e6ea;
  --accent: #0b64d0;
  --note-bg: #f0f5fb;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #14181d;
    --surface: #1c2229;
    --text: #e6eaef;
    --muted: #9aa5b1;
    --border: #2b333c;
    --accent: #6aa9f5;
    --note-bg: #1a2530;
  }
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  padding: 16px;
  background-color: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Arial,
    sans-serif;
  font-size: 16px;
  line-height: 1.65;
  -webkit-text-size-adjust: 100%;
}

.container {
  max-width: 780px;
  margin: 32px auto;
  background-color: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 40px;
}

@media (max-width: 600px) {
  body {
    padding: 0;
  }
  .container {
    margin: 0;
    border: none;
    border-radius: 0;
    padding: 24px 20px;
  }
}

h1 {
  margin: 0 0 4px;
  font-size: 28px;
  line-height: 1.3;
}

h2 {
  margin: 36px 0 12px;
  font-size: 20px;
  line-height: 1.4;
  padding-top: 20px;
  border-top: 1px solid var(--border);
}

h2:first-of-type {
  border-top: none;
  padding-top: 0;
  margin-top: 28px;
}

h3 {
  margin: 24px 0 8px;
  font-size: 17px;
}

p,
li {
  margin: 0 0 14px;
}

ul {
  padding-left: 22px;
}

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

a:hover {
  text-decoration: none;
}

.meta {
  color: var(--muted);
  font-size: 14px;
  margin-bottom: 28px;
}

.note {
  background-color: var(--note-bg);
  border-left: 3px solid var(--accent);
  border-radius: 0 8px 8px 0;
  padding: 14px 18px;
  margin: 20px 0;
}

.note p:last-child {
  margin-bottom: 0;
}

.toc {
  background-color: var(--note-bg);
  border-radius: 8px;
  padding: 18px 18px 18px 38px;
  margin-bottom: 8px;
}

.toc li {
  margin-bottom: 6px;
}

table {
  width: 100%;
  border-collapse: collapse;
  margin: 16px 0 20px;
  font-size: 15px;
}

th,
td {
  border: 1px solid var(--border);
  padding: 10px 12px;
  text-align: left;
  vertical-align: top;
}

th {
  background-color: var(--note-bg);
  font-weight: 600;
}

footer {
  margin-top: 40px;
  padding-top: 20px;
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 14px;
}

.app-list {
  list-style: none;
  padding: 0;
  margin: 24px 0 0;
}

.app-list li {
  margin-bottom: 12px;
}

.app-list a {
  display: block;
  padding: 16px 18px;
  border: 1px solid var(--border);
  border-radius: 10px;
  text-decoration: none;
  font-weight: 600;
}

.app-list a:hover {
  border-color: var(--accent);
}

.app-list span {
  display: block;
  color: var(--muted);
  font-weight: 400;
  font-size: 14px;
  margin-top: 2px;
}

@media (max-width: 600px) {
  table {
    font-size: 14px;
  }

  th,
  td {
    padding: 8px 9px;
    hyphens: auto;
  }

  .toc {
    padding: 16px 16px 16px 34px;
  }
}