:root {
  --primary: #1E3C72;
  --secondary: #2A5298;
  --accent: #FFA500;
  --text: #FFFFFF;
  --bg-gradient: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
  --card-bg: rgba(42, 82, 152, 0.8);
  --shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
}

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

body {
  background: var(--bg-gradient);
  color: var(--text);
  font-family: 'Montserrat', 'Segoe UI', sans-serif;
  line-height: 1.6;
  overflow-x: hidden;
}

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

.header {
  position: relative;
  height: 80px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0 30px;
  background: rgba(0, 0, 0, 0.2);
  backdrop-filter: blur(10px);
  z-index: 100;
}

.logo {
  font-size: 24px;
  font-weight: 700;
  background: linear-gradient(to right, var(--accent), #FFD700);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.nav {
  display: flex;
  gap: 30px;
}

.nav-link {
  color: var(--text);
  text-decoration: none;
  font-weight: 500;
  position: relative;
  padding: 5px 0;
  transition: color 0.3s;
}

.nav-link:hover {
  color: var(--accent);
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--accent);
  transition: width 0.3s;
}

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

.hero {
  padding: 100px 0;
  text-align: center;
  position: relative;
}

.hero::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: 0.1;
  z-index: -1;
}

.hero-title {
  font-size: 48px;
  margin-bottom: 20px;
  background: linear-gradient(to right, #FFFFFF, #FFD700);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  animation: fadeInUp 1s ease;
}

.hero-subtitle {
  font-size: 20px;
  max-width: 800px;
  margin: 0 auto 40px;
  opacity: 0.9;
}

.notice {
  background: rgba(255, 255, 255, 0.1);
  padding: 15px;
  border-radius: 8px;
  margin: 30px auto;
  max-width: 800px;
  border-left: 4px solid var(--accent);
  animation: pulse 2s infinite;
}

@keyframes pulse {
  0% { box-shadow: 0 0 0 0 rgba(255, 165, 0, 0.4); }
  70% { box-shadow: 0 0 0 10px rgba(255, 165, 0, 0); }
  100% { box-shadow: 0 0 0 0 rgba(255, 165, 0, 0); }
}

.content {
  padding: 60px 0;
}

.section {
  margin-bottom: 80px;
  background: rgba(0, 0, 0, 0.1);
  padding: 40px;
  border-radius: 15px;
  position: relative;
  overflow: hidden;
}

.section::after {
  content: '';
  position: absolute;
  top: 0;
  right: 0;
  width: 200px;
  height: 200px;
  background: url('https://images.gptkong.com/demo/sample3.png') center/cover no-repeat;
  opacity: 0.1;
  z-index: -1;
}

.section-title {
  font-size: 32px;
  margin-bottom: 30px;
  position: relative;
  display: inline-block;
}

.section-title::after {
  content: '';
  position: absolute;
  bottom: -10px;
  left: 0;
  width: 50%;
  height: 3px;
  background: var(--accent);
}

.section-subtitle {
  font-size: 24px;
  margin: 30px 0 20px;
  color: var(--accent);
}

.code-container {
  background: rgba(0, 0, 0, 0.3);
  border-radius: 8px;
  padding: 20px;
  margin: 20px 0;
  overflow: auto;
  position: relative;
}

.code-container::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 4px;
  height: 100%;
  background: var(--accent);
}

pre {
  margin: 0;
  font-family: 'Courier New', monospace;
  font-size: 14px;
  line-height: 1.5;
  color: #FFD700;
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 30px;
  margin: 40px 0;
}

.card {
  background: var(--card-bg);
  border-radius: 10px;
  padding: 30px;
  transition: transform 0.3s, box-shadow 0.3s;
  position: relative;
  overflow: hidden;
}

.card:hover {
  transform: translateY(-10px);
  box-shadow: var(--shadow);
}

.card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 5px;
  background: var(--accent);
}

.card-img {
  width: 100%;
  height: 200px;
  object-fit: cover;
  border-radius: 8px;
  margin-bottom: 20px;
  transition: transform 0.5s;
}

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

.footer {
  background: rgba(0, 0, 0, 0.3);
  padding: 50px 0;
  text-align: center;
}

.footer-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 30px;
  max-width: 1000px;
  margin: 0 auto 40px;
}

.footer-card {
  background: rgba(255, 255, 255, 0.05);
  padding: 20px;
  border-radius: 10px;
  transition: transform 0.3s;
}

.footer-card:hover {
  transform: translateY(-5px);
}

.footer-img {
  width: 80px;
  height: 80px;
  object-fit: cover;
  border-radius: 50%;
  margin-bottom: 15px;
  border: 2px solid var(--accent);
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (max-width: 768px) {
  .header {
    flex-direction: column;
    height: auto;
    padding: 20px;
  }
  
  .nav {
    margin-top: 20px;
    flex-wrap: wrap;
    justify-content: center;
  }
  
  .hero-title {
    font-size: 36px;
  }
  
  .section {
    padding: 30px 20px;
  }
}

@media (max-width: 480px) {
  .hero-title {
    font-size: 28px;
  }
  
  .section-title {
    font-size: 26px;
  }
  
  .grid {
    grid-template-columns: 1fr;
  }
}