:root {
  --bg: #f7f8fa;
  --card: #ffffff;
  --text: #1f2937;
  --muted: #6b7280;
  --primary: #008ae0;
  --border: #e5e7eb;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: Inter, "Segoe UI", Roboto, Arial, sans-serif;
  background: linear-gradient(180deg, #f7f8fa 0%, #eef4fb 100%);
  color: var(--text);
}

.container {
  max-width: 860px;
  margin: 32px auto;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 16px;
  padding: 28px;
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.05);
}

.header {
  border-bottom: 1px solid var(--border);
  padding-bottom: 16px;
  margin-bottom: 24px;
}

.top-nav {
  margin-top: 14px;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.top-nav a {
  display: inline-block;
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 7px 12px;
  font-size: 13px;
  color: var(--text);
  background: #f9fafb;
}

.top-nav a[aria-current="page"] {
  border-color: var(--primary);
  background: #ebf6ff;
  color: #0f5d94;
}

h1 {
  margin: 0 0 8px;
  font-size: 30px;
  line-height: 1.2;
  color: #0f172a;
}

.subtitle {
  margin: 0;
  color: var(--muted);
}

.updated {
  margin-top: 8px;
  font-size: 14px;
  color: var(--muted);
}

section {
  margin-bottom: 22px;
}

h2 {
  margin: 0 0 10px;
  font-size: 20px;
  color: #0f172a;
}

p {
  margin: 0 0 12px;
  line-height: 1.65;
}

ul {
  margin: 0 0 12px 20px;
  padding: 0;
}

li {
  margin-bottom: 8px;
  line-height: 1.6;
}

a {
  color: var(--primary);
  text-decoration: none;
}

a:hover {
  text-decoration: underline;
}

.footer {
  border-top: 1px solid var(--border);
  margin-top: 28px;
  padding-top: 16px;
  color: var(--muted);
  font-size: 14px;
}

@media (max-width: 768px) {
  .container {
    margin: 0;
    border-radius: 0;
    border: none;
    padding: 20px;
  }

  h1 {
    font-size: 25px;
  }

  h2 {
    font-size: 18px;
  }
}