:root {
  --primary-blue: #4A90E2;
  --primary-purple: #9013FE;
  --accent-gold: #F5A623;
  --accent-silver: #BDC3C7;
  --highlight-pink: #FF4081;
  --highlight-orange: #FF7043;
  --dark-bg: #0F0F1A;
  --light-text: #F5F5F7;
  --section-padding: 80px 0;
}

@font-face {
  font-family: 'Roboto';
  src: url('https://fonts.googleapis.com/css2?family=Roboto:wght@300;400;500;700&display=swap');
}

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

body {
  background: var(--dark-bg);
  color: var(--light-text);
  font-family: 'Roboto', sans-serif;
  line-height: 1.6;
  overflow-x: hidden;
}

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

.header {
  position: relative;
  height: 600px;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  background: linear-gradient(135deg, var(--primary-blue), var(--primary-purple));
  clip-path: polygon(0 0, 100% 0, 100% 85%, 0 100%);
  margin-bottom: 80px;
  overflow: hidden;
}

.header::after {
  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;
  padding: 0 20px;
}

.header h1 {
  font-size: 3.5rem;
  margin-bottom: 20px;
  text-shadow: 0 4px 10px rgba(0,0,0,0.3);
  animation: fadeInDown 1s ease-out;
}

.header p {
  font-size: 1.2rem;
  margin-bottom: 30px;
  animation: fadeInUp 1s ease-out 0.3s forwards;
  opacity: 0;
}

.notice {
  position: fixed;
  bottom: 20px;
  right: 20px;
  background: rgba(255,255,255,0.9);
  color: #333;
  padding: 10px 20px;
  border-radius: 30px;
  box-shadow: 0 4px 15px rgba(0,0,0,0.1);
  z-index: 1000;
  font-size: 0.9rem;
}

.section {
  padding: var(--section-padding);
  position: relative;
}

.section-title {
  text-align: center;
  margin-bottom: 60px;
  position: relative;
}

.section-title h2 {
  font-size: 2.5rem;
  display: inline-block;
  padding-bottom: 15px;
}

.section-title h2::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 80px;
  height: 4px;
  background: var(--accent-gold);
  border-radius: 2px;
}

.section-bg {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  opacity: 0.05;
  z-index: -1;
  background: url('https://images.gptkong.com/demo/sample3.png') center/cover no-repeat;
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(350px, 1fr));
  gap: 30px;
}

.card {
  background: rgba(255,255,255,0.05);
  border-radius: 15px;
  overflow: hidden;
  transition: all 0.4s ease;
  box-shadow: 0 10px 30px rgba(0,0,0,0.2);
  backdrop-filter: blur(10px);
  border: 1px solid rgba(255,255,255,0.1);
}

.card:hover {
  transform: translateY(-10px);
  box-shadow: 0 15px 35px rgba(0,0,0,0.3);
  border-color: rgba(255,255,255,0.3);
}

.card-img {
  height: 200px;
  overflow: hidden;
}

.card-img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
}

.card:hover .card-img img {
  transform: scale(1.1);
}

.card-content {
  padding: 25px;
}

.card h3 {
  font-size: 1.5rem;
  margin-bottom: 15px;
  color: var(--accent-gold);
}

.card p {
  margin-bottom: 20px;
  color: rgba(255,255,255,0.8);
}

.btn {
  display: inline-block;
  padding: 12px 30px;
  background: linear-gradient(45deg, var(--accent-gold), var(--highlight-orange));
  color: #fff;
  border-radius: 50px;
  text-decoration: none;
  font-weight: 500;
  transition: all 0.3s ease;
  box-shadow: 0 4px 15px rgba(245, 166, 35, 0.3);
}

.btn:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 20px rgba(245, 166, 35, 0.4);
}

.code-block {
  background: rgba(0,0,0,0.3);
  border-radius: 10px;
  padding: 20px;
  margin: 30px 0;
  overflow-x: auto;
  border-left: 4px solid var(--accent-gold);
}

pre {
  margin: 0;
  font-family: 'Courier New', monospace;
  font-size: 0.9rem;
  line-height: 1.5;
  color: #f8f8f2;
}

.nav-tabs {
  display: flex;
  justify-content: center;
  margin-bottom: 40px;
  flex-wrap: wrap;
}

.nav-tabs a {
  padding: 10px 20px;
  margin: 0 10px;
  color: var(--light-text);
  text-decoration: none;
  position: relative;
  font-weight: 500;
  transition: all 0.3s ease;
}

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

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

.nav-tabs a.active {
  color: var(--accent-gold);
}

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

.parallax-section {
  height: 400px;
  background-attachment: fixed;
  background-position: center;
  background-repeat: no-repeat;
  background-size: cover;
  position: relative;
  margin: 80px 0;
}

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

.parallax-content {
  position: relative;
  z-index: 1;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 0 20px;
}

.footer {
  background: linear-gradient(135deg, var(--primary-purple), #2A0B45);
  padding: 60px 0 30px;
  text-align: center;
}

.footer-links {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  margin-bottom: 30px;
}

.footer-links a {
  color: var(--light-text);
  margin: 0 15px;
  text-decoration: none;
  transition: color 0.3s ease;
}

.footer-links a:hover {
  color: var(--accent-gold);
}

.footer p {
  opacity: 0.7;
  font-size: 0.9rem;
}

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

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

@media (max-width: 768px) {
  .header h1 {
    font-size: 2.5rem;
  }
  
  .header p {
    font-size: 1rem;
  }
  
  .grid {
    grid-template-columns: 1fr;
  }
  
  .section-title h2 {
    font-size: 2rem;
  }
  
  .nav-tabs a {
    margin: 5px;
    padding: 8px 15px;
  }
}

@media (max-width: 480px) {
  .header {
    height: 500px;
  }
  
  .header h1 {
    font-size: 2rem;
  }
  
  .section {
    padding: 60px 0;
  }
  
  .card {
    min-width: 100%;
  }
}