:root {
  --primary: #0D284B;
  --secondary: #C0C0C0;
  --accent: #FFA500;
  --highlight: #32CD32;
  --text: #333;
  --light: #FFFFFF;
  --shadow: rgba(0, 0, 0, 0.1);
  --radius: 10px;
  --transition: all 0.3s ease;
}

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

@import url('https://fonts.googleapis.com/css2?family=Poppins:wght@600;700&family=Roboto:wght@400;500&display=swap');

body {
  font-family: 'Roboto', sans-serif;
  color: var(--text);
  line-height: 1.6;
  background: linear-gradient(135deg, var(--primary), var(--secondary), var(--light));
  background-size: 400% 400%;
  animation: gradientAnimation 15s ease infinite;
  padding: 0;
  margin: 0;
  min-height: 100%;
}

@keyframes gradientAnimation {
  0% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
  100% { background-position: 0% 50%; }
}

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

.header {
  text-align: center;
  padding: 40px 0;
  position: relative;
}

.header::before {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 200px;
  height: 3px;
  background: linear-gradient(90deg, transparent, var(--accent), transparent);
}

h1, h2, h3, h4 {
  font-family: 'Poppins', sans-serif;
  color: var(--primary);
  margin-bottom: 20px;
  position: relative;
}

h2 {
  font-size: 28px;
  padding-bottom: 10px;
}

h2::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 50px;
  height: 3px;
  background: var(--accent);
}

h3 {
  font-size: 22px;
  margin-top: 30px;
}

p {
  margin-bottom: 20px;
  font-size: 16px;
}

.notice {
  background: rgba(255, 255, 255, 0.9);
  padding: 15px;
  border-radius: var(--radius);
  margin-bottom: 30px;
  box-shadow: 0 5px 15px var(--shadow);
  text-align: center;
  font-weight: 500;
  color: var(--primary);
}

.grid-container {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 30px;
  margin: 40px 0;
}

.card {
  background: rgba(255, 255, 255, 0.95);
  border-radius: var(--radius);
  padding: 25px;
  box-shadow: 0 10px 20px var(--shadow);
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

.card:hover {
  transform: translateY(-10px);
  box-shadow: 0 15px 30px rgba(0, 0, 0, 0.15);
}

.card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 5px;
  background: linear-gradient(90deg, var(--accent), var(--highlight));
}

.card-img {
  width: 100%;
  height: 200px;
  object-fit: cover;
  border-radius: var(--radius);
  margin-bottom: 20px;
  box-shadow: 0 5px 15px var(--shadow);
  transition: var(--transition);
}

.card:hover .card-img {
  transform: scale(1.03);
}

.card h3 {
  margin-bottom: 15px;
}

.card p {
  color: #666;
  margin-bottom: 15px;
}

.tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 15px;
}

.tag {
  background: rgba(13, 40, 75, 0.1);
  color: var(--primary);
  padding: 5px 10px;
  border-radius: 20px;
  font-size: 12px;
  font-weight: 500;
}

.content-section {
  background: rgba(255, 255, 255, 0.95);
  border-radius: var(--radius);
  padding: 40px;
  margin: 40px 0;
  box-shadow: 0 10px 30px var(--shadow);
}

pre {
  background: #f8f8f8;
  border-radius: var(--radius);
  padding: 20px;
  margin: 20px 0;
  overflow-x: auto;
  box-shadow: inset 0 0 10px rgba(0, 0, 0, 0.05);
  border-left: 4px solid var(--accent);
}

code {
  font-family: 'Roboto Mono', monospace;
  font-size: 14px;
  color: #333;
}

.nav-links {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 15px;
  margin: 30px 0;
}

.nav-link {
  color: var(--primary);
  text-decoration: none;
  font-weight: 500;
  padding: 10px 15px;
  border-radius: 30px;
  transition: var(--transition);
  background: rgba(255, 255, 255, 0.7);
  box-shadow: 0 3px 10px var(--shadow);
}

.nav-link:hover {
  background: var(--accent);
  color: white;
  transform: translateY(-3px);
}

.footer {
  text-align: center;
  padding: 30px 0;
  margin-top: 50px;
  color: var(--light);
  background: rgba(13, 40, 75, 0.8);
}

@media (max-width: 768px) {
  .content-section {
    padding: 25px;
  }
  
  h2 {
    font-size: 24px;
  }
  
  h3 {
    font-size: 20px;
  }
}