body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background: #f5f7fa;
  color: #333;
}

.top-nav {
  position: sticky;
  top: 0;
  background: #fff;
  border-bottom: 1px solid #e2e8f0;
  padding: 12px 20px;
  display: flex;
  align-items: center;
  gap: 16px;
  z-index: 100;
}

.top-nav a {
  color: #4a6cf7;
  text-decoration: none;
  font-size: 14px;
  font-weight: 500;
}

.top-nav a:hover {
  text-decoration: underline;
}

.top-nav .sep {
  color: #ccc;
}

.container {
  max-width: 800px;
  margin: 0 auto;
  padding: 40px 20px;
}

h1 {
  font-size: 28px;
  margin-bottom: 8px;
}

.subtitle {
  color: #666;
  margin-bottom: 32px;
}

.card {
  background: #fff;
  border-radius: 8px;
  padding: 24px;
  margin-bottom: 16px;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

.card h2 {
  font-size: 18px;
  margin: 0 0 8px;
}

.card p {
  margin: 0;
  color: #555;
}

.banner {
  width: 100%;
  max-height: 200px;
  object-fit: cover;
  border-radius: 8px;
  margin-bottom: 24px;
}

#clock {
  font-size: 48px;
  font-weight: bold;
  text-align: center;
  color: #4a6cf7;
  padding: 20px 0;
}