:root {
  --primary-color: #1a1a2e;
  --secondary-color: #16213e;
  --accent-green: #0aff95;
  --accent-orange: #ff6b6b;
  --background-color: #f5f5f5;
  --text-color: #333333;
  --light-text: #ffffff;
  --shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
  --border-radius: 12px;
  --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, #f5f7fa 0%, #e4e8eb 100%);
  padding-top: 80px;
}

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

.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
  color: var(--light-text);
  padding: 15px 0;
  box-shadow: var(--shadow);
  z-index: 1000;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.nav-brand {
  font-size: 24px;
  font-weight: 700;
  margin-left: 20px;
  background: linear-gradient(to right, var(--accent-green), var(--accent-orange));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.nav-links {
  display: flex;
  gap: 30px;
  margin-right: 20px;
}

.nav-link {
  color: var(--light-text);
  text-decoration: none;
  font-weight: 500;
  transition: var(--transition);
  position: relative;
}

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

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -5px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--accent-green);
  transition: var(--transition);
}

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

.hero {
  padding: 80px 0;
  text-align: center;
  background: linear-gradient(rgba(26, 26, 46, 0.8), rgba(22, 33, 62, 0.8)), 
              url('https://images.gptkong.com/demo/sample1.png') center/cover no-repeat;
  color: var(--light-text);
  margin-bottom: 60px;
  border-radius: var(--border-radius);
  box-shadow: var(--shadow);
}

.hero h1 {
  font-size: 48px;
  margin-bottom: 20px;
  background: linear-gradient(to right, var(--accent-green), var(--accent-orange));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.hero p {
  font-size: 20px;
  max-width: 800px;
  margin: 0 auto 30px;
}

.notice {
  background-color: rgba(255, 255, 255, 0.1);
  padding: 15px;
  border-radius: var(--border-radius);
  margin: 40px auto;
  max-width: 800px;
  text-align: center;
  border-left: 4px solid var(--accent-green);
}

.content-section {
  background-color: white;
  padding: 40px;
  border-radius: var(--border-radius);
  margin-bottom: 60px;
  box-shadow: var(--shadow);
  position: relative;
  overflow: hidden;
}

.content-section::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 5px;
  height: 100%;
  background: linear-gradient(to bottom, var(--accent-green), var(--accent-orange));
}

.content-section h2 {
  font-size: 32px;
  margin-bottom: 30px;
  color: var(--primary-color);
  position: relative;
  display: inline-block;
}

.content-section h2::after {
  content: '';
  position: absolute;
  bottom: -10px;
  left: 0;
  width: 50px;
  height: 3px;
  background: linear-gradient(to right, var(--accent-green), var(--accent-orange));
}

.content-section h3 {
  font-size: 24px;
  margin: 30px 0 20px;
  color: var(--secondary-color);
}

.content-section p {
  margin-bottom: 20px;
  font-size: 17px;
}

.code-block {
  background-color: #282c34;
  color: #abb2bf;
  padding: 20px;
  border-radius: var(--border-radius);
  margin: 25px 0;
  overflow-x: auto;
  font-family: 'Courier New', monospace;
  box-shadow: inset 0 0 10px rgba(0, 0, 0, 0.5);
}

.code-block code {
  display: block;
  white-space: pre;
}

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

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

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

.image-card img {
  width: 100%;
  height: 200px;
  object-fit: cover;
  border-bottom: 1px solid #eee;
}

.image-card .caption {
  padding: 15px;
  text-align: center;
}

.tabs-container {
  margin: 40px 0;
}

.tabs {
  display: flex;
  border-bottom: 2px solid var(--accent-green);
}

.tab {
  flex: 1;
  padding: 15px;
  text-align: center;
  cursor: pointer;
  transition: var(--transition);
  font-weight: 500;
  color: var(--text-color);
  background: rgba(10, 255, 149, 0.1);
}

.tab:hover {
  background: rgba(10, 255, 149, 0.2);
}

.tab.active {
  background: var(--accent-green);
  color: white;
}

.tab-content {
  display: none;
  padding: 30px;
  background: white;
  border-radius: 0 0 var(--border-radius) var(--border-radius);
  box-shadow: var(--shadow);
  animation: fadeIn 0.5s forwards;
}

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

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

.button {
  display: inline-block;
  background: linear-gradient(to right, var(--accent-green), var(--accent-orange));
  color: white;
  padding: 12px 25px;
  border-radius: 50px;
  text-decoration: none;
  font-weight: 500;
  margin: 20px 0;
  transition: var(--transition);
  box-shadow: 0 4px 15px rgba(10, 255, 149, 0.3);
  border: none;
  cursor: pointer;
}

.button:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 25px rgba(10, 255, 149, 0.4);
}

.footer {
  background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
  color: var(--light-text);
  padding: 40px 0;
  text-align: center;
  margin-top: 60px;
}

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

.social-links {
  display: flex;
  justify-content: center;
  gap: 20px;
  margin-top: 20px;
}

.social-link {
  color: var(--light-text);
  font-size: 20px;
  transition: var(--transition);
}

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

@media (max-width: 768px) {
  .nav-links {
    display: none;
  }
  
  .hero h1 {
    font-size: 36px;
  }
  
  .hero p {
    font-size: 18px;
  }
  
  .content-section {
    padding: 30px;
  }
  
  .content-section h2 {
    font-size: 28px;
  }
  
  .content-section h3 {
    font-size: 22px;
  }
  
  .tabs {
    flex-direction: column;
  }
}

@media (max-width: 480px) {
  .hero {
    padding: 60px 20px;
  }
  
  .hero h1 {
    font-size: 28px;
  }
  
  .content-section {
    padding: 20px;
  }
  
  .image-grid {
    grid-template-columns: 1fr;
  }
}