:root {
  color-scheme: light;
  --bg: #f6f7f8;
  --paper: #ffffff;
  --text: #17191c;
  --muted: #5c6470;
  --line: #dfe3e8;
  --accent: #111827;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Arial, sans-serif;
  line-height: 1.6;
}

.page {
  width: min(920px, calc(100% - 32px));
  margin: 0 auto;
  padding: 32px 0 56px;
}

.top {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 24px;
  margin-bottom: 24px;
}

.brand {
  font-size: 20px;
  font-weight: 800;
  letter-spacing: 0.02em;
}

.brand span {
  color: var(--muted);
  font-weight: 500;
}

.nav {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 10px;
}

.nav a {
  color: var(--muted);
  font-size: 14px;
  text-decoration: none;
}

.nav a:hover {
  color: var(--text);
  text-decoration: underline;
}

.card {
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: 8px;
  padding: 28px;
}

h1 {
  margin: 0 0 8px;
  font-size: clamp(26px, 2.8vw, 36px);
  line-height: 1.12;
}

h2 {
  margin: 32px 0 10px;
  font-size: 22px;
  line-height: 1.25;
}

h3 {
  margin: 22px 0 8px;
  font-size: 18px;
}

p {
  margin: 10px 0;
}

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

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

ul,
ol {
  padding-left: 22px;
}

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

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

th {
  background: #f1f3f5;
}

.notice {
  border-left: 4px solid var(--accent);
  background: #f8fafc;
  padding: 12px 14px;
  margin: 18px 0;
}

.footer {
  margin-top: 24px;
  color: var(--muted);
  font-size: 13px;
}

@media (max-width: 640px) {
  .top {
    flex-direction: column;
  }

  .nav {
    justify-content: flex-start;
  }

  .card {
    padding: 20px;
  }
}