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

body {
  font-family: Arial, sans-serif;
  font-size: 16px;
  background: #f5f5f5;
  color: #111;
}

h1 {
  font-size: 28px;
  color: #0c1c55;
}

h2 {
  font-size: 22px;
  color: #0b9095;
  padding-bottom: 7px;
}

a {
  text-decoration: none;
  color: #111;
}

.site-header {
  background: #fff;
  border-bottom: 1px solid #ddd;
  padding: 10px 20px;
}

.site-branding a {
  font-weight: bold;
  font-size: 20px;
}

.main-menu ul {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  column-gap: 10px;
  row-gap: 7px;
  margin: 10px 0 0 0 !important;
  padding: 0;
}

.main-menu li {
  display: block;
}

.main-menu li a {
  display: block;
  padding: 6px 10px;
  background: #e7f9fa;
  border: 1px solid #afd5d6;
  border-radius: 4px;
  transition: background 0.2s ease, color 0.2s ease;
}

.main-menu li a:hover {
  background: #23afbb;
  color: #ffffff;
}

.layout {
  display: flex;
  flex-direction: row-reverse;
  max-width: 1200px;
  margin: 20px auto;
  gap: 20px;
}

.sidebar {
  width: 300px;
}

.main-content {
  flex: 1;
  background: #fff;
  padding: 20px;
  border: 1px solid #ddd;
}

.main-content h1 {
  margin-bottom: 20px;
}

.tool-box {
  padding: 20px;
  border: 1px solid #ddd;
  background: #fafafa;
  text-align: center;
}

.tool-box button {
  padding: 10px 20px;
  font-size: 16px;
  cursor: pointer;
}

.tool-box p {
  margin-top: 15px;
  font-size: 18px;
}

.ad {
  background: #ddd;
  text-align: center;
  padding: 20px;
  margin: 10px 0;
}

.site-footer {
  background: #fff;
  border-top: 1px solid #ddd;
  padding: 20px;
  text-align: center;
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 10px;
  margin-bottom: 15px;
}

.footer-links a {
  padding: 5px 10px;
  background: #eee;
  border-radius: 4px;
}

@media (max-width: 900px) {
  .layout {
    flex-direction: column;
  }

  .sidebar {
    width: 100%;
  }
}