:root {
  --bg-top: #eaf6f6;
  --bg-bottom: #dcecf7;
  --card-bg: #ffffff;
  --text-primary: #1f2d33;
  --text-secondary: #4a5c63;
  --accent: #3a8f8f;
  --accent-dark: #2a6b6b;
  --border: #e1ecec;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  color: var(--text-primary);
  background: linear-gradient(180deg, var(--bg-top) 0%, var(--bg-bottom) 100%);
  display: flex;
  justify-content: center;
  padding: 48px 20px;
  line-height: 1.6;
}

main {
  width: 100%;
  max-width: 640px;
  background: var(--card-bg);
  border-radius: 16px;
  box-shadow: 0 10px 30px rgba(31, 45, 51, 0.08);
  padding: 40px 44px;
}

h1 {
  margin-top: 0;
  font-size: 1.9rem;
  font-weight: 700;
  color: var(--text-primary);
}

h2 {
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--accent-dark);
  margin-top: 2em;
  margin-bottom: 0.5em;
}

p {
  color: var(--text-secondary);
}

ul {
  padding-left: 1.2em;
  color: var(--text-secondary);
}

li {
  margin-bottom: 0.5em;
}

a {
  color: var(--accent);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 0.15s ease, color 0.15s ease;
}

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

.subtitle {
  color: var(--text-secondary);
  margin-bottom: 2em;
}

.meta {
  color: var(--text-secondary);
  font-size: 0.9rem;
  margin-top: -0.5em;
}

.back-link {
  display: inline-block;
  margin-top: 2.5em;
  font-size: 0.95rem;
}

hr {
  border: none;
  border-top: 1px solid var(--border);
  margin: 2em 0;
}

@media (max-width: 480px) {
  main {
    padding: 28px 24px;
    border-radius: 12px;
  }
}