:root {
  --primary-color: #0f2027;
  --secondary-color: #2c5364;
  --accent-color: #00c9a7;
  --text-color: #f8f9fa;
  --card-bg: rgba(255, 255, 255, 0.1);
  --transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
}

body {
  font-family: 'Roboto', sans-serif;
  margin: 0;
  padding: 0;
  background: linear-gradient(135deg, var(--primary-color), #203a43, var(--secondary-color));
  color: var(--text-color);
  line-height: 1.6;
  min-height: 100%;
}

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

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

.header::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: url('https://images.gptkong.com/demo/sample1.png') center/cover no-repeat;
  opacity: 0.2;
  z-index: -1;
}

.header h1 {
  font-size: 2.5rem;
  margin-bottom: 20px;
  background: linear-gradient(90deg, var(--accent-color), #00c9a7);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  text-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
}

.header p {
  max-width: 800px;
  margin: 0 auto;
  font-size: 1.1rem;
  opacity: 0.9;
}

.note {
  background: rgba(0, 0, 0, 0.3);
  padding: 15px;
  border-radius: 10px;
  margin: 30px auto;
  max-width: 800px;
  text-align: center;
  border-left: 4px solid var(--accent-color);
}

.content-section {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(500px, 1fr));
  gap: 30px;
  margin: 50px 0;
}

.card {
  background: var(--card-bg);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  border-radius: 15px;
  padding: 30px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
  transition: var(--transition);
  border: 1px solid rgba(255, 255, 255, 0.1);
}

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

.card h2, .card h3 {
  color: var(--accent-color);
  margin-top: 0;
  position: relative;
  padding-bottom: 10px;
}

.card h2::after, .card h3::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 50px;
  height: 3px;
  background: linear-gradient(90deg, var(--accent-color), transparent);
}

.card p {
  margin-bottom: 20px;
}

.image-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 20px;
  margin: 30px 0;
}

.image-grid img {
  width: 100%;
  height: auto;
  border-radius: 10px;
  box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
  transition: var(--transition);
  aspect-ratio: 1/1;
  object-fit: cover;
}

.image-grid img:hover {
  transform: scale(1.05);
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.3);
}

pre {
  background: rgba(0, 0, 0, 0.3);
  border-radius: 10px;
  padding: 20px;
  overflow-x: auto;
  font-family: 'Courier New', monospace;
  font-size: 0.9rem;
  line-height: 1.5;
  margin: 20px 0;
  border-left: 4px solid var(--accent-color);
}

code {
  color: #f8f9fa;
}

table {
  width: 100%;
  border-collapse: collapse;
  margin: 20px 0;
  background: var(--card-bg);
  backdrop-filter: blur(10px);
  border-radius: 10px;
  overflow: hidden;
}

th, td {
  padding: 15px;
  text-align: left;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

th {
  background: rgba(0, 0, 0, 0.2);
  color: var(--accent-color);
}

tr:hover {
  background: rgba(255, 255, 255, 0.05);
}

.footer {
  text-align: center;
  padding: 40px 0;
  margin-top: 50px;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
}

@media (max-width: 768px) {
  .content-section {
    grid-template-columns: 1fr;
  }
  
  .header h1 {
    font-size: 2rem;
  }
  
  .card {
    padding: 20px;
  }
}

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

.floating {
  animation: float 6s ease-in-out infinite;
}