:root {
  --primary-color: #0d47a1;
  --secondary-color: #00e5ff;
  --accent-color: #ff4081;
  --bg-color: #121212;
  --text-color: #e0e0e0;
  --card-bg: rgba(255, 255, 255, 0.05);
  --font-main: 'Roboto', sans-serif;
  --font-heading: 'Orbitron', sans-serif;
}

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

body {
  font-family: var(--font-main);
  background: var(--bg-color);
  color: var(--text-color);
  line-height: 1.6;
  overflow-x: hidden;
}

.header {
  position: relative;
  height: 80vh;
  min-height: 500px;
  background: linear-gradient(135deg, var(--primary-color), #000);
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
  padding: 2rem;
  overflow: hidden;
}

.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: 0;
}

.header-content {
  position: relative;
  z-index: 1;
  max-width: 800px;
}

.header h1 {
  font-family: var(--font-heading);
  font-size: 3.5rem;
  margin-bottom: 1rem;
  color: var(--secondary-color);
  text-shadow: 0 0 10px rgba(0, 229, 255, 0.5);
}

.header p {
  font-size: 1.2rem;
  margin-bottom: 2rem;
  opacity: 0.9;
}

.notice {
  background: rgba(0, 229, 255, 0.1);
  padding: 1rem;
  border-radius: 8px;
  border: 1px solid var(--secondary-color);
  margin-top: 2rem;
  font-size: 0.9rem;
}

.main-content {
  max-width: 1200px;
  margin: 0 auto;
  padding: 3rem 2rem;
}

.section {
  margin-bottom: 4rem;
  background: var(--card-bg);
  border-radius: 16px;
  padding: 2.5rem;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
  position: relative;
  overflow: hidden;
}

.section::after {
  content: '';
  position: absolute;
  top: 0;
  right: 0;
  width: 100px;
  height: 100px;
  background: radial-gradient(circle, var(--secondary-color), transparent 70%);
  filter: blur(30px);
  opacity: 0.2;
  z-index: 0;
}

.section h2 {
  font-family: var(--font-heading);
  color: var(--secondary-color);
  margin-bottom: 1.5rem;
  font-size: 2rem;
  position: relative;
  z-index: 1;
}

.section h3 {
  font-family: var(--font-heading);
  color: var(--text-color);
  margin: 1.5rem 0 1rem;
  font-size: 1.5rem;
  position: relative;
  z-index: 1;
}

.section p {
  margin-bottom: 1.5rem;
  font-size: 1.1rem;
  position: relative;
  z-index: 1;
}

.code-container {
  background: rgba(0, 0, 0, 0.3);
  border-radius: 8px;
  padding: 1.5rem;
  margin: 1.5rem 0;
  overflow: auto;
  position: relative;
}

pre {
  margin: 0;
  font-family: 'Courier New', monospace;
  font-size: 0.95rem;
  line-height: 1.5;
}

code {
  color: #f8f8f2;
}

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

.image-card {
  border-radius: 12px;
  overflow: hidden;
  box-shadow: 0 8px 20px rgba(0, 0, 0, 0.2);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
  position: relative;
}

.image-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 12px 25px rgba(0, 229, 255, 0.3);
}

.image-card img {
  width: 100%;
  height: auto;
  display: block;
  transition: transform 0.5s ease;
}

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

.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;
  position: relative;
  color: var(--text-color);
  font-family: var(--font-heading);
}

.nav-tab::after {
  content: '';
  position: absolute;
  bottom: -1px;
  left: 0;
  width: 0;
  height: 3px;
  background: var(--secondary-color);
  transition: width 0.3s ease;
}

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

.nav-tab.active {
  color: var(--secondary-color);
}

.nav-tab.active::after {
  width: 100%;
}

.footer {
  text-align: center;
  padding: 2rem;
  background: rgba(0, 0, 0, 0.3);
  margin-top: 4rem;
}

@media (max-width: 768px) {
  .header h1 {
    font-size: 2.5rem;
  }
  
  .section {
    padding: 1.5rem;
  }
  
  .image-grid {
    grid-template-columns: 1fr;
  }
}

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

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