:root {
  --primary-dark: #0d47a1;
  --primary-light: #6a1b9a;
  --accent-green: #00e676;
  --accent-orange: #ffab00;
  --text-light: #ffffff;
  --text-gray: #e0e0e0;
  --card-bg: rgba(26, 35, 126, 0.8);
}

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

body {
  background: linear-gradient(135deg, var(--primary-dark), var(--primary-light));
  font-family: 'Roboto', sans-serif;
  color: var(--text-light);
  line-height: 1.6;
  padding-top: 80px;
  min-height: 100%;
}

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

.header {
  text-align: center;
  margin-bottom: 40px;
  position: relative;
}

.header h1 {
  font-size: 2.5rem;
  margin-bottom: 20px;
  background: linear-gradient(90deg, var(--accent-green), var(--accent-orange));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  text-shadow: 0 2px 10px rgba(0,0,0,0.2);
}

.header p {
  font-size: 1.2rem;
  max-width: 800px;
  margin: 0 auto;
  color: var(--text-gray);
}

.navbar {
  position: fixed;
  top: 0;
  width: 100%;
  background: rgba(13, 71, 161, 0.9);
  padding: 15px 30px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  z-index: 1000;
  box-shadow: 0 4px 20px rgba(0,0,0,0.3);
}

.nav-logo {
  font-size: 1.5rem;
  font-weight: bold;
  color: var(--text-light);
  text-decoration: none;
}

.nav-links {
  display: flex;
  gap: 20px;
}

.nav-links a {
  color: var(--text-light);
  text-decoration: none;
  transition: color 0.3s ease;
  position: relative;
}

.nav-links a:hover {
  color: var(--accent-green);
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -5px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--accent-green);
  transition: width 0.3s ease;
}

.nav-links a:hover::after {
  width: 100%;
}

.content-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(500px, 1fr));
  gap: 30px;
  margin-bottom: 50px;
}

.content-card {
  background: var(--card-bg);
  border-radius: 15px;
  padding: 30px;
  box-shadow: 0 10px 30px rgba(0,0,0,0.2);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
  position: relative;
  overflow: hidden;
}

.content-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 15px 35px rgba(0,0,0,0.3);
}

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

.content-card h2 {
  font-size: 1.8rem;
  margin-bottom: 20px;
  color: var(--accent-green);
}

.content-card h3 {
  font-size: 1.5rem;
  margin: 25px 0 15px;
  color: var(--accent-orange);
}

.content-card p {
  margin-bottom: 20px;
  font-size: 1.1rem;
}

.img-container {
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
  margin: 30px 0;
  justify-content: center;
}

.img-container img {
  width: 150px;
  height: 150px;
  object-fit: cover;
  border-radius: 10px;
  box-shadow: 0 5px 15px rgba(0,0,0,0.2);
  transition: transform 0.3s ease;
}

.img-container img:hover {
  transform: scale(1.05);
}

pre {
  background: rgba(0,0,0,0.2);
  border-radius: 8px;
  padding: 20px;
  margin: 20px 0;
  overflow-x: auto;
  font-family: 'Courier New', monospace;
  position: relative;
  border-left: 4px solid var(--accent-green);
}

pre::before {
  content: 'CSS';
  position: absolute;
  top: 0;
  right: 0;
  background: var(--accent-green);
  color: white;
  padding: 2px 10px;
  border-radius: 0 0 0 5px;
  font-size: 0.8rem;
}

code {
  font-family: 'Courier New', monospace;
  background: rgba(0,0,0,0.2);
  padding: 2px 5px;
  border-radius: 3px;
}

.button {
  display: inline-block;
  padding: 12px 25px;
  border-radius: 5px;
  font-weight: bold;
  text-decoration: none;
  transition: all 0.3s ease;
  margin: 10px 0;
}

.button-primary {
  background-color: var(--accent-green);
  color: #000;
}

.button-primary:hover {
  background-color: #00c853;
  transform: translateY(-2px);
  box-shadow: 0 5px 15px rgba(0,230,118,0.3);
}

.button-secondary {
  background-color: var(--accent-orange);
  color: #000;
}

.button-secondary:hover {
  background-color: #ff8f00;
  transform: translateY(-2px);
  box-shadow: 0 5px 15px rgba(255,171,0,0.3);
}

.footer {
  text-align: center;
  padding: 30px;
  margin-top: 50px;
  background: rgba(0,0,0,0.2);
  border-top: 1px solid rgba(255,255,255,0.1);
}

.notice {
  background: rgba(255,255,255,0.1);
  padding: 15px;
  border-radius: 5px;
  margin: 30px 0;
  text-align: center;
  border-left: 4px solid var(--accent-orange);
}

@keyframes float {
  0% { transform: translateY(0px); }
  50% { transform: translateY(-10px); }
  100% { transform: translateY(0px); }
}

.floating {
  animation: float 3s ease-in-out infinite;
}

@media (max-width: 768px) {
  .content-grid {
    grid-template-columns: 1fr;
  }
  
  .navbar {
    flex-direction: column;
    padding: 15px;
  }
  
  .nav-links {
    margin-top: 15px;
    flex-wrap: wrap;
    justify-content: center;
  }
  
  .header h1 {
    font-size: 2rem;
  }
}