:root {
  --primary-color: #1e3c72;
  --secondary-color: #2a5298;
  --accent-color: #f39c12;
  --text-color: #333;
  --light-bg: #f5f7fa;
  --dark-bg: #0f172a;
  --success-color: #27ae60;
  --warning-color: #e67e22;
  --error-color: #e74c3c;
  --border-radius: 8px;
  --box-shadow: 0 10px 20px rgba(0,0,0,0.1);
  --transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
}

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

body {
  font-family: 'Roboto', sans-serif;
  line-height: 1.6;
  color: var(--text-color);
  background: linear-gradient(135deg, var(--light-bg) 0%, #e0e5ec 100%);
  min-height: 100%;
  padding: 0;
  margin: 0;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 2rem;
}

.header {
  text-align: center;
  margin-bottom: 3rem;
  position: relative;
}

.header::after {
  content: "";
  display: block;
  width: 100px;
  height: 4px;
  background: linear-gradient(90deg, var(--primary-color), var(--accent-color));
  margin: 1.5rem auto;
  border-radius: 2px;
}

h1, h2, h3, h4 {
  color: var(--primary-color);
  margin-bottom: 1rem;
  font-weight: 700;
}

h1 {
  font-size: 2.5rem;
  background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  text-shadow: 0 2px 4px rgba(0,0,0,0.1);
}

h2 {
  font-size: 2rem;
  position: relative;
  padding-bottom: 0.5rem;
}

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

h3 {
  font-size: 1.5rem;
  margin-top: 2rem;
}

h4 {
  font-size: 1.2rem;
  margin-top: 1.5rem;
}

p {
  margin-bottom: 1.5rem;
  font-size: 1.1rem;
}

strong {
  color: var(--secondary-color);
}

a {
  color: var(--accent-color);
  text-decoration: none;
  transition: var(--transition);
}

a:hover {
  color: var(--warning-color);
  text-decoration: underline;
}

article {
  background: white;
  border-radius: var(--border-radius);
  box-shadow: var(--box-shadow);
  padding: 3rem;
  margin-bottom: 3rem;
  position: relative;
  overflow: hidden;
}

article::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 5px;
  height: 100%;
  background: linear-gradient(to bottom, var(--primary-color), var(--accent-color));
}

.code-container {
  position: relative;
  margin: 2rem 0;
  border-radius: var(--border-radius);
  overflow: hidden;
  box-shadow: 0 5px 15px rgba(0,0,0,0.1);
}

pre {
  background: var(--dark-bg);
  color: #f8f8f2;
  padding: 1.5rem;
  overflow-x: auto;
  font-family: 'Fira Code', monospace;
  font-size: 0.95rem;
  line-height: 1.5;
  border-radius: var(--border-radius);
  position: relative;
}

code {
  font-family: 'Fira Code', monospace;
  background: rgba(0,0,0,0.05);
  padding: 0.2rem 0.4rem;
  border-radius: 3px;
  color: var(--secondary-color);
}

.image-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 1.5rem;
  margin: 2rem 0;
}

.image-card {
  background: white;
  border-radius: var(--border-radius);
  overflow: hidden;
  box-shadow: var(--box-shadow);
  transition: var(--transition);
}

.image-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 15px 30px rgba(0,0,0,0.15);
}

.image-card img {
  width: 100%;
  height: auto;
  display: block;
  border-radius: var(--border-radius) var(--border-radius) 0 0;
}

.image-caption {
  padding: 1rem;
  text-align: center;
  background: white;
  color: var(--text-color);
}

.notice {
  background: rgba(30, 60, 114, 0.1);
  border-left: 4px solid var(--primary-color);
  padding: 1rem;
  margin: 2rem 0;
  border-radius: 0 var(--border-radius) var(--border-radius) 0;
}

.notice strong {
  display: block;
  margin-bottom: 0.5rem;
  color: var(--primary-color);
}

.nav-tabs {
  display: flex;
  flex-wrap: wrap;
  margin: 2rem 0;
  border-bottom: 1px solid #ddd;
}

.nav-tab {
  padding: 0.75rem 1.5rem;
  cursor: pointer;
  transition: var(--transition);
  border-bottom: 3px solid transparent;
  font-weight: 500;
}

.nav-tab.active {
  color: var(--accent-color);
  border-bottom-color: var(--accent-color);
}

.nav-tab:hover:not(.active) {
  background: rgba(0,0,0,0.05);
}

.tab-content {
  display: none;
  padding: 1.5rem;
  background: white;
  border-radius: 0 0 var(--border-radius) var(--border-radius);
  box-shadow: 0 5px 15px rgba(0,0,0,0.05);
}

.tab-content.active {
  display: block;
}

.tech-badge {
  display: inline-block;
  padding: 0.25rem 0.75rem;
  background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
  color: white;
  border-radius: 20px;
  font-size: 0.8rem;
  margin-right: 0.5rem;
  margin-bottom: 0.5rem;
  box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

.footer-note {
  text-align: center;
  margin-top: 3rem;
  padding: 1.5rem;
  background: rgba(0,0,0,0.03);
  border-radius: var(--border-radius);
  font-size: 0.9rem;
  color: #666;
}

@media (max-width: 768px) {
  .container {
    padding: 1rem;
  }
  
  article {
    padding: 1.5rem;
  }
  
  h1 {
    font-size: 2rem;
  }
  
  h2 {
    font-size: 1.5rem;
  }
  
  .image-grid {
    grid-template-columns: 1fr;
  }
}

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

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

.highlight-box {
  background: linear-gradient(135deg, rgba(30,60,114,0.1) 0%, rgba(42,82,152,0.1) 100%);
  border-radius: var(--border-radius);
  padding: 2rem;
  margin: 2rem 0;
  border-left: 4px solid var(--accent-color);
}

.highlight-box h3 {
  margin-top: 0;
}