:root {
  color-scheme: light dark;
  --bg: #ffffff;
  --text: #191f28;
  --text-secondary: #4e5968;
  --text-muted: #8b95a1;
  --primary: #3182f6;
  --surface: #f2f4f6;
  --border: #e5e8eb;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #17171c;
    --text: #e5e8eb;
    --text-secondary: #b0b8c1;
    --text-muted: #6b7684;
    --surface: #22242a;
    --border: #333d4b;
  }
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Apple SD Gothic Neo",
    "Pretendard", "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
  -webkit-font-smoothing: antialiased;
}

main {
  max-width: 720px;
  margin: 0 auto;
  padding: 48px 24px 96px;
}

header.site {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: 720px;
  margin: 0 auto;
  padding: 20px 24px;
}

header.site .brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  font-size: 18px;
  color: var(--text);
  text-decoration: none;
}

header.site nav {
  display: flex;
  gap: 16px;
}

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

header.site nav a:hover {
  color: var(--primary);
}

h1 {
  font-size: 30px;
  line-height: 1.35;
  margin-bottom: 8px;
  letter-spacing: -0.4px;
}

h2 {
  font-size: 20px;
  margin: 40px 0 12px;
  letter-spacing: -0.3px;
}

h3 {
  font-size: 16px;
  margin: 24px 0 8px;
}

p, li {
  color: var(--text-secondary);
  font-size: 15.5px;
}

ul, ol {
  padding-left: 22px;
  margin: 8px 0 16px;
}

li {
  margin-bottom: 6px;
}

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

.meta {
  color: var(--text-muted);
  font-size: 14px;
  margin-bottom: 32px;
}

.notice {
  background: var(--surface);
  border-radius: 14px;
  padding: 16px 18px;
  margin: 20px 0;
  font-size: 14.5px;
  color: var(--text-secondary);
}

table {
  width: 100%;
  border-collapse: collapse;
  margin: 12px 0 20px;
  font-size: 14.5px;
}

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

th {
  color: var(--text);
  white-space: nowrap;
}

.hero {
  padding: 48px 0 24px;
}

.hero h1 {
  font-size: 38px;
}

.hero p.lead {
  font-size: 18px;
  margin-top: 12px;
}

.cta {
  display: inline-block;
  margin-top: 28px;
  background: var(--primary);
  color: #fff;
  text-decoration: none;
  font-weight: 700;
  padding: 14px 26px;
  border-radius: 14px;
}

.features {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 14px;
  margin-top: 40px;
}

.feature {
  background: var(--surface);
  border-radius: 16px;
  padding: 20px;
}

.feature strong {
  display: block;
  color: var(--text);
  margin-bottom: 6px;
}

footer.site {
  max-width: 720px;
  margin: 0 auto;
  padding: 32px 24px 48px;
  border-top: 1px solid var(--border);
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  color: var(--text-muted);
  font-size: 13.5px;
}

footer.site a {
  color: var(--text-muted);
}