:root {
  --primary-dark: #001f3f;
  --primary-light: #0074D9;
  --accent: #28a745;
  --highlight: #ff9800;
  --neutral-light: #f8f9fa;
  --neutral-dark: #2c3e50;
  --text-primary: #212529;
  --text-secondary: #495057;
}

body {
  font-family: 'Roboto', 'Helvetica', sans-serif;
  line-height: 1.6;
  color: var(--text-primary);
  background: linear-gradient(135deg, var(--primary-dark), var(--primary-light));
  margin: 0;
  padding: 0;
  min-height: 100%;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 80px 20px 40px;
  background-color: rgba(255, 255, 255, 0.95);
  border-radius: 16px;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.2);
  position: relative;
  overflow: hidden;
}

.container::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 8px;
  background: linear-gradient(90deg, var(--accent), var(--highlight));
}

h1, h2, h3, h4 {
  font-weight: 700;
  margin-top: 2rem;
  color: var(--primary-dark);
}

h2 {
  font-size: 2rem;
  border-bottom: 2px solid var(--accent);
  padding-bottom: 0.5rem;
  margin-bottom: 1.5rem;
}

h3 {
  font-size: 1.5rem;
  color: var(--primary-light);
}

p {
  font-size: 1.1rem;
  color: var(--text-secondary);
  margin-bottom: 1.5rem;
}

strong {
  color: var(--primary-dark);
}

.grid-container {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(500px, 1fr));
  gap: 2rem;
  margin: 2rem 0;
}

.grid-item {
  background: white;
  border-radius: 12px;
  padding: 2rem;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
  transition: all 0.3s ease;
}

.grid-item:hover {
  transform: translateY(-5px);
  box-shadow: 0 8px 25px rgba(0, 0, 0, 0.15);
}

.card {
  background: white;
  border-radius: 12px;
  padding: 1.5rem;
  margin-bottom: 2rem;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
  transition: all 0.3s ease;
}

.card:hover {
  transform: translateY(-8px);
  box-shadow: 0 8px 25px rgba(0, 0, 0, 0.2);
}

.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  background: linear-gradient(90deg, var(--primary-dark), var(--primary-light));
  padding: 1rem 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  z-index: 1000;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
}

.navbar a {
  color: white;
  text-decoration: none;
  margin: 0 1rem;
  font-weight: 500;
  transition: color 0.3s;
  position: relative;
}

.navbar a:hover {
  color: var(--accent);
}

.navbar a::after {
  content: "";
  position: absolute;
  bottom: -5px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--accent);
  transition: width 0.3s;
}

.navbar a:hover::after {
  width: 100%;
}

.sidebar {
  position: fixed;
  left: 0;
  top: 70px;
  width: 250px;
  height: calc(100vh - 70px);
  background: var(--neutral-dark);
  padding: 1.5rem;
  transform: translateX(-100%);
  transition: transform 0.3s ease;
  z-index: 999;
}

.sidebar.active {
  transform: translateX(0);
}

.sidebar a {
  display: block;
  color: white;
  margin: 1rem 0;
  text-decoration: none;
  transition: color 0.3s;
  padding: 0.5rem;
  border-radius: 4px;
}

.sidebar a:hover {
  color: var(--highlight);
  background: rgba(255, 255, 255, 0.1);
}

.button {
  display: inline-block;
  background: linear-gradient(45deg, var(--accent), var(--highlight));
  color: white;
  padding: 0.8rem 1.5rem;
  border-radius: 8px;
  text-decoration: none;
  font-weight: 500;
  transition: all 0.3s ease;
  border: none;
  cursor: pointer;
  box-shadow: 0 4px 15px rgba(40, 167, 69, 0.3);
}

.button:hover {
  transform: translateY(-3px);
  box-shadow: 0 6px 20px rgba(40, 167, 69, 0.4);
}

.button:active {
  transform: translateY(1px);
}

.fade-in-section {
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}

.fade-in-section.is-visible {
  opacity: 1;
  transform: none;
}

.chart-container {
  background: white;
  border-radius: 12px;
  padding: 1.5rem;
  margin-bottom: 2rem;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
  transition: all 0.3s ease;
}

.chart-container:hover {
  transform: scale(1.02);
  box-shadow: 0 8px 25px rgba(0, 0, 0, 0.2);
}

pre {
  background: #f8f9fa;
  border-radius: 8px;
  padding: 1.5rem;
  overflow-x: auto;
  font-family: 'Courier New', monospace;
  font-size: 0.9rem;
  line-height: 1.5;
  margin: 1.5rem 0;
  border-left: 4px solid var(--accent);
}

code {
  font-family: 'Courier New', monospace;
  background: rgba(40, 167, 69, 0.1);
  padding: 0.2rem 0.4rem;
  border-radius: 4px;
  color: var(--accent);
}

.img-container {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  margin: 2rem 0;
  justify-content: center;
}

.img-container img {
  width: 150px;
  height: 150px;
  object-fit: cover;
  border-radius: 12px;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
  transition: all 0.3s ease;
}

.img-container img:hover {
  transform: scale(1.05);
  box-shadow: 0 8px 25px rgba(0, 0, 0, 0.2);
}

.notice {
  background: rgba(255, 152, 0, 0.1);
  border-left: 4px solid var(--highlight);
  padding: 1rem;
  margin: 2rem 0;
  border-radius: 0 8px 8px 0;
}

@media (max-width: 768px) {
  .grid-container {
    grid-template-columns: 1fr;
  }
  
  .navbar {
    flex-direction: column;
    padding: 1rem;
  }
  
  .sidebar {
    width: 200px;
  }
  
  .container {
    padding: 100px 15px 30px;
  }
  
  h2 {
    font-size: 1.8rem;
  }
  
  h3 {
    font-size: 1.3rem;
  }
}

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

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