:root {
  --bg: #f4f5f7;
  --card: #ffffff;
  --text: #1c2330;
  --muted: #5b6472;
  --accent: #2f5bd8;
  --border: #e3e6ea;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  font-size: 16px;
  line-height: 1.6;
}

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

header.site {
  background: #0e1116;
  color: #e6e9ef;
}

header.site .inner, main, footer.site .inner {
  max-width: 820px;
  margin: 0 auto;
  padding: 0 20px;
}

header.site .inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding-top: 18px;
  padding-bottom: 18px;
  flex-wrap: wrap;
}

header.site .brand {
  font-weight: 700;
  font-size: 19px;
  letter-spacing: -0.01em;
  color: #e6e9ef;
  text-decoration: none;
}

header.site .brand span { color: #5b8cff; }

header.site nav a {
  color: #aab3c2;
  text-decoration: none;
  font-size: 14px;
  margin-left: 18px;
}

header.site nav a:hover { color: #ffffff; }

main { padding-top: 40px; padding-bottom: 40px; }

h1 { font-size: 30px; line-height: 1.25; margin: 0 0 14px; letter-spacing: -0.01em; }
h2 { font-size: 20px; margin: 32px 0 10px; }
h3 { font-size: 16px; margin: 22px 0 6px; }

.lead { font-size: 18px; color: var(--muted); margin: 0 0 28px; }

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 24px 26px;
  margin-bottom: 20px;
}

.notice {
  background: #fff8e6;
  border: 1px solid #f0d58a;
  border-radius: 10px;
  padding: 14px 18px;
  font-size: 14px;
  margin-bottom: 24px;
}

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

ul { padding-left: 20px; }

footer.site {
  border-top: 1px solid var(--border);
  padding: 24px 0 40px;
  font-size: 13px;
  color: var(--muted);
}

footer.site a { color: var(--muted); margin-right: 14px; }

@media (max-width: 560px) {
  h1 { font-size: 24px; }
  header.site nav a { margin-left: 0; margin-right: 14px; }
}