:root {
  color-scheme: light;
  --bg: #f5f7fb;
  --card: #ffffff;
  --ink: #172033;
  --muted: #58667e;
  --line: #dce3ee;
  --accent: #0051df;
  --accent-dark: #003ca7;
  --soft: #eaf1ff;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: Arial, Helvetica, sans-serif;
  line-height: 1.6;
}

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

.site-header {
  background: #ffffff;
  border-bottom: 1px solid var(--line);
}

.nav {
  align-items: center;
  display: flex;
  flex-wrap: wrap;
  gap: 12px 18px;
  justify-content: space-between;
  margin: 0 auto;
  max-width: 1040px;
  padding: 18px 20px;
}

.brand {
  color: var(--ink);
  font-size: 20px;
  font-weight: 700;
  text-decoration: none;
}

.nav-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

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

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

.container {
  margin: 0 auto;
  max-width: 940px;
  padding: 44px 20px 64px;
}

.hero {
  background: linear-gradient(135deg, #0051df, #0b4f48);
  border-radius: 8px;
  color: #ffffff;
  padding: 36px;
}

.hero h1,
.content h1 {
  font-size: 40px;
  line-height: 1.1;
  margin: 0 0 14px;
}

.hero p {
  color: rgba(255, 255, 255, 0.88);
  font-size: 18px;
  margin: 0;
  max-width: 700px;
}

.grid {
  display: grid;
  gap: 16px;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  margin-top: 24px;
}

.card,
.content {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 8px;
  box-shadow: 0 10px 30px rgba(23, 32, 51, 0.06);
}

.card {
  padding: 22px;
}

.card h2 {
  font-size: 20px;
  margin: 0 0 8px;
}

.card p {
  color: var(--muted);
  margin: 0 0 14px;
}

.content {
  padding: 34px;
}

.content h2 {
  border-top: 1px solid var(--line);
  font-size: 24px;
  margin: 32px 0 10px;
  padding-top: 28px;
}

.content h2:first-of-type {
  border-top: 0;
  margin-top: 20px;
  padding-top: 0;
}

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

.content p,
.content li {
  color: var(--muted);
}

.content ul {
  padding-left: 22px;
}

.meta {
  color: var(--muted);
  font-size: 14px;
  margin: 0 0 24px;
}

.notice {
  background: var(--soft);
  border-left: 4px solid var(--accent);
  border-radius: 6px;
  color: var(--ink);
  margin: 20px 0;
  padding: 14px 16px;
}

.table {
  border-collapse: collapse;
  margin: 18px 0;
  width: 100%;
}

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

.table th {
  background: #f0f4fa;
  color: var(--ink);
}

.site-footer {
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 14px;
  margin: 0 auto;
  max-width: 1040px;
  padding: 24px 20px 40px;
}

@media (max-width: 640px) {
  .container {
    padding-top: 28px;
  }

  .hero,
  .content {
    padding: 24px;
  }

  .hero h1,
  .content h1 {
    font-size: 32px;
  }
}