:root {
  --primary-color: #1a1a2e;
  --secondary-color: #16213e;
  --highlight-green: #00ff85;
  --highlight-orange: #ff9100;
  --text-color: #ffffff;
  --accent-purple: #6a0dad;
  --gradient-blue: linear-gradient(135deg, #1a1a2e 0%, #16213e 100%);
  --card-shadow: 0 10px 20px rgba(0,0,0,0.2);
}

body {
  margin: 0;
  padding: 0;
  font-family: 'Open Sans', sans-serif;
  background: var(--gradient-blue);
  color: var(--text-color);
  line-height: 1.6;
}

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

.header-banner {
  position: relative;
  height: 400px;
  border-radius: 20px;
  overflow: hidden;
  margin-bottom: 3rem;
  box-shadow: var(--card-shadow);
  display: flex;
  align-items: center;
  justify-content: center;
  background: url('https://images.gptkong.com/demo/sample1.png') center/cover no-repeat;
}

.header-banner::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0,0,0,0.5);
}

.header-content {
  position: relative;
  z-index: 2;
  text-align: center;
  padding: 2rem;
  max-width: 800px;
}

.header-content h1 {
  font-size: 3rem;
  margin-bottom: 1rem;
  background: linear-gradient(to right, var(--highlight-green), var(--highlight-orange));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  text-shadow: 0 2px 10px rgba(0,0,0,0.3);
}

.header-content p {
  font-size: 1.2rem;
  margin-bottom: 2rem;
}

.notice {
  background: rgba(255,255,255,0.1);
  backdrop-filter: blur(10px);
  padding: 1rem;
  border-radius: 10px;
  margin: 2rem 0;
  text-align: center;
  border-left: 4px solid var(--highlight-green);
}

article {
  background: rgba(255,255,255,0.05);
  border-radius: 20px;
  padding: 2rem;
  margin-bottom: 3rem;
  box-shadow: var(--card-shadow);
}

article h2 {
  font-size: 2rem;
  margin-top: 0;
  color: var(--highlight-green);
  border-bottom: 2px solid var(--accent-purple);
  padding-bottom: 0.5rem;
  display: inline-block;
}

article h3 {
  font-size: 1.5rem;
  color: var(--highlight-orange);
  margin-top: 2rem;
}

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

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

code {
  color: var(--highlight-green);
  font-family: 'Courier New', monospace;
}

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

.image-card {
  background: rgba(255,255,255,0.1);
  border-radius: 15px;
  overflow: hidden;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
  box-shadow: 0 5px 15px rgba(0,0,0,0.1);
}

.image-card:hover {
  transform: translateY(-10px);
  box-shadow: 0 15px 30px rgba(0,0,0,0.2);
}

.image-card img {
  width: 100%;
  height: auto;
  display: block;
  border-radius: 15px 15px 0 0;
}

.image-caption {
  padding: 1rem;
  text-align: center;
  background: rgba(0,0,0,0.2);
}

.nav-tabs {
  display: flex;
  margin-bottom: 2rem;
  border-bottom: 1px solid rgba(255,255,255,0.1);
}

.nav-tab {
  padding: 0.8rem 1.5rem;
  cursor: pointer;
  border-radius: 8px 8px 0 0;
  margin-right: 0.5rem;
  background: rgba(255,255,255,0.05);
  transition: all 0.3s ease;
}

.nav-tab.active {
  background: var(--highlight-green);
  color: var(--primary-color);
  font-weight: bold;
}

.nav-tab:hover:not(.active) {
  background: rgba(255,255,255,0.1);
}

.content-section {
  display: none;
}

.content-section.active {
  display: block;
  animation: fadeIn 0.5s ease;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

.float-label {
  position: absolute;
  top: -10px;
  left: 20px;
  background: var(--primary-color);
  padding: 0 10px;
  font-size: 0.8rem;
  color: var(--highlight-green);
}

.highlight-box {
  background: rgba(0,255,133,0.1);
  border-left: 4px solid var(--highlight-green);
  padding: 1.5rem;
  border-radius: 0 10px 10px 0;
  margin: 2rem 0;
}

@media (max-width: 768px) {
  .header-banner {
    height: 300px;
  }
  
  .header-content h1 {
    font-size: 2rem;
  }
  
  .image-grid {
    grid-template-columns: 1fr;
  }
  
  article {
    padding: 1.5rem;
  }
}

/* Animation effects */
.pulse {
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.7; }
}

.glow {
  animation: glow 3s ease-in-out infinite alternate;
}

@keyframes glow {
  from { box-shadow: 0 0 5px rgba(0,255,133,0.5); }
  to { box-shadow: 0 0 20px rgba(0,255,133,0.8); }
}

/* Floating elements */
.floating {
  animation: floating 6s ease-in-out infinite;
}

@keyframes floating {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-20px); }
}