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

body {
  font-family: Arial, Verdana, sans-serif;
  background-color: #ffffff;
  color: #333;
  line-height: 1.6;
}

header {
  background: linear-gradient(to bottom, #f8f8f8 0%, #e6e6e6 100%);
  border-bottom: 3px solid #000099;
  padding: 20px 0;
}

.header-container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

.header-content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 20px;
}

.logo-area {
  font-size: 24px;
  font-weight: bold;
  color: #000099;
}

.tagline {
  text-align: right;
  flex: 1;
  min-width: 250px;
}

.tagline-main {
  font-size: 28px;
  color: #dddddd;
  font-weight: normal;
  text-shadow: 1px 1px 2px rgba(0,0,0,0.1);
}

.tagline-sub {
  font-size: 12px;
  color: #000099;
  font-weight: bold;
  margin-top: 5px;
}

nav {
  background: linear-gradient(to bottom, #4a4a4a 0%, #2a2a2a 100%);
  border-top: 2px solid #000099;
}

.nav-container {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
}

nav a {
  color: #ffffff;
  text-decoration: none;
  padding: 12px 18px;
  display: block;
  font-size: 11px;
  font-weight: bold;
  text-transform: uppercase;
  border-right: 1px solid #555;
  transition: background-color 0.3s;
}

nav a:hover {
  background-color: #000099;
}

nav a:last-child {
  border-right: none;
}

.hero-image {
  width: 100%;
  max-height: 200px;
  overflow: hidden;
  background-color: #e6e6e6;
  display: flex;
  align-items: center;
  justify-content: center;
}

main {
  max-width: 1200px;
  margin: 0 auto;
  padding: 40px 20px;
  display: flex;
  gap: 30px;
  flex-wrap: wrap;
}

.sidebar {
  flex: 0 0 250px;
  background-color: #e6e6e6;
  padding: 20px;
  border-left: 3px solid #dddddd;
}

.sidebar a {
  color: #000099;
  text-decoration: none;
  display: block;
  padding: 8px 0;
  font-size: 13px;
  font-weight: bold;
  text-align: right;
  transition: color 0.3s;
}

.sidebar a:hover {
  color: #0000cc;
}

.sidebar a::before {
  content: "■ ";
  color: #000099;
  font-size: 8px;
  margin-right: 8px;
}

.sidebar-section {
  margin-bottom: 25px;
}

.sidebar-title {
  font-size: 13px;
  font-weight: bold;
  text-align: center;
  margin-bottom: 15px;
  color: #333;
}

.content {
  flex: 1;
  min-width: 300px;
}

h1 {
  color: #000099;
  font-size: 32px;
  margin-bottom: 25px;
  padding-bottom: 15px;
  border-bottom: 3px solid #e6e6e6;
}

article h2 {
  color: #000099;
  font-size: 24px;
  margin-top: 30px;
  margin-bottom: 15px;
}

article h3 {
  color: #333;
  font-size: 18px;
  margin-top: 25px;
  margin-bottom: 12px;
}

article p {
  margin-bottom: 15px;
  text-align: justify;
}

.transition-section {
  margin: 40px 0;
  padding: 25px;
  background-color: #f8f8f8;
  border-left: 4px solid #000099;
}

.links-section {
  margin-top: 40px;
  padding: 30px;
  background-color: #e6e6e6;
  border-radius: 5px;
}

.links-section h3 {
  color: #000099;
  font-size: 20px;
  margin-bottom: 15px;
  padding-bottom: 10px;
  border-bottom: 2px solid #dddddd;
}

.links-section ul {
  list-style: none;
  column-count: 2;
  column-gap: 30px;
  margin-bottom: 30px;
}

.links-section li {
  margin-bottom: 10px;
  break-inside: avoid;
  padding-left: 18px;
  position: relative;
}

.links-section li::before {
  content: "■";
  position: absolute;
  left: 0;
  color: #000099;
  font-size: 8px;
  top: 5px;
}

.links-section a {
  color: #000099;
  text-decoration: none;
  font-size: 14px;
  transition: color 0.3s;
}

.links-section a:hover {
  color: #0000cc;
  text-decoration: underline;
}

footer {
  background: linear-gradient(to bottom, #4a4a4a 0%, #2a2a2a 100%);
  color: #ffffff;
  text-align: center;
  padding: 20px;
  margin-top: 50px;
  font-size: 12px;
}

@media (max-width: 768px) {
  .header-content {
    flex-direction: column;
    text-align: center;
  }

  .tagline {
    text-align: center;
  }

  .tagline-main {
    font-size: 20px;
  }

  nav a {
    padding: 10px 12px;
    font-size: 10px;
  }

  main {
    flex-direction: column-reverse;
  }

  .sidebar {
    flex: 1 1 100%;
  }

  .sidebar a {
    text-align: left;
  }

  h1 {
    font-size: 26px;
  }

  .links-section ul {
    column-count: 1;
  }
}

@media (max-width: 480px) {
  .nav-container {
    flex-direction: column;
  }

  nav a {
    border-right: none;
    border-bottom: 1px solid #555;
  }

  h1 {
    font-size: 22px;
  }

  .tagline-main {
    font-size: 18px;
  }
}