:root {
  --main-bg-color: #2c3e50;
  --secondary-bg-color: #8e44ad;
  --accent-color-orange: #e67e22;
  --accent-color-green: #27ae60;
  --text-color: #ecf0f1;
  --section-padding: 80px 0;
  --max-width: 1200px;
}

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

body {
  font-family: 'Roboto', 'Helvetica', Arial, sans-serif;
  background: linear-gradient(135deg, var(--main-bg-color), #1a2634);
  color: var(--text-color);
  line-height: 1.8;
  overflow-x: hidden;
}

.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 20px;
}

.header {
  position: relative;
  height: 600px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: radial-gradient(circle at 30% 50%, var(--secondary-bg-color), transparent 70%),
              linear-gradient(to right, var(--main-bg-color), #34495e);
  overflow: hidden;
}

.header::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: url('https://images.gptkong.com/demo/sample1.png') no-repeat center right/contain;
  opacity: 0.2;
}

.header-content {
  text-align: center;
  z-index: 1;
  padding: 40px;
  max-width: 800px;
}

.header h1 {
  font-size: 3.5rem;
  margin-bottom: 20px;
  background: linear-gradient(to right, var(--accent-color-orange), var(--accent-color-green));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  text-shadow: 0 2px 10px rgba(0,0,0,0.3);
}

.header p {
  font-size: 1.2rem;
  margin-bottom: 30px;
  opacity: 0.9;
}

.notice {
  position: fixed;
  bottom: 20px;
  right: 20px;
  background: rgba(0,0,0,0.7);
  padding: 10px 20px;
  border-radius: 30px;
  font-size: 14px;
  z-index: 1000;
  backdrop-filter: blur(5px);
  box-shadow: 0 5px 15px rgba(0,0,0,0.3);
}

.navbar {
  position: fixed;
  top: 0;
  width: 100%;
  background: rgba(44, 62, 80, 0.9);
  display: flex;
  justify-content: center;
  padding: 15px 0;
  z-index: 1000;
  backdrop-filter: blur(10px);
  box-shadow: 0 2px 20px rgba(0,0,0,0.2);
  border-bottom: 1px solid rgba(142, 68, 173, 0.3);
}

.nav-container {
  width: 100%;
  max-width: var(--max-width);
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0 20px;
}

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

.nav-links a {
  color: var(--text-color);
  text-decoration: none;
  font-size: 16px;
  font-weight: 500;
  transition: all 0.3s ease;
  position: relative;
  padding: 5px 0;
}

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

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

.nav-links a:hover {
  color: var(--accent-color-orange);
}

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

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

.section-title h2 {
  font-size: 2.5rem;
  margin-bottom: 20px;
  color: var(--accent-color-orange);
  position: relative;
  display: inline-block;
}

.section-title h2::after {
  content: '';
  position: absolute;
  bottom: -10px;
  left: 50%;
  transform: translateX(-50%);
  width: 80px;
  height: 3px;
  background: linear-gradient(to right, var(--accent-color-orange), var(--accent-color-green));
}

.section-title p {
  max-width: 700px;
  margin: 0 auto;
  font-size: 1.1rem;
  opacity: 0.8;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 30px;
  margin-top: 50px;
}

.feature-card {
  background: rgba(255,255,255,0.05);
  border-radius: 15px;
  padding: 30px;
  transition: all 0.3s ease;
  backdrop-filter: blur(5px);
  border: 1px solid rgba(255,255,255,0.1);
  position: relative;
  overflow: hidden;
}

.feature-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(135deg, rgba(142, 68, 173, 0.1), rgba(39, 174, 96, 0.1));
  z-index: -1;
}

.feature-card:hover {
  transform: translateY(-10px);
  box-shadow: 0 15px 30px rgba(0,0,0,0.3);
  border-color: rgba(142, 68, 173, 0.3);
}

.feature-icon {
  width: 80px;
  height: 80px;
  margin: 0 auto 20px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--accent-color-orange), var(--accent-color-green));
  border-radius: 50%;
  font-size: 2rem;
  color: white;
}

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

.feature-card p {
  margin-bottom: 20px;
  font-size: 1rem;
}

.code-block {
  background: rgba(0,0,0,0.3);
  border-radius: 10px;
  padding: 20px;
  margin: 30px 0;
  overflow: hidden;
  border-left: 4px solid var(--accent-color-green);
  position: relative;
}

.code-block::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(to right, rgba(39,174,96,0.1), transparent);
  pointer-events: none;
}

pre {
  margin: 0;
  font-family: 'Courier New', monospace;
  font-size: 0.9rem;
  white-space: pre-wrap;
  word-wrap: break-word;
  color: #f8f8f2;
}

.image-gallery {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
  gap: 20px;
  margin: 40px 0;
}

.gallery-item {
  border-radius: 10px;
  overflow: hidden;
  box-shadow: 0 5px 15px rgba(0,0,0,0.2);
  transition: all 0.3s ease;
  position: relative;
}

.gallery-item:hover {
  transform: scale(1.05);
  box-shadow: 0 10px 25px rgba(0,0,0,0.3);
}

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

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

.footer {
  background: linear-gradient(to right, var(--main-bg-color), #1a2634);
  padding: 60px 0 30px;
  text-align: center;
  position: relative;
}

.footer::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 2px;
  background: linear-gradient(to right, transparent, var(--accent-color-green), transparent);
}

.footer-content {
  max-width: 600px;
  margin: 0 auto;
}

.footer p {
  margin-bottom: 20px;
  opacity: 0.8;
}

.scroll-top {
  position: fixed;
  bottom: 30px;
  right: 30px;
  width: 50px;
  height: 50px;
  background: var(--accent-color-green);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transition: all 0.3s ease;
  box-shadow: 0 5px 15px rgba(0,0,0,0.3);
  z-index: 999;
}

.scroll-top.active {
  opacity: 1;
  visibility: visible;
}

.scroll-top:hover {
  background: var(--accent-color-orange);
  transform: translateY(-5px);
}

@media (max-width: 768px) {
  .header h1 {
    font-size: 2.5rem;
  }
  
  .header p {
    font-size: 1rem;
  }
  
  .nav-links {
    gap: 15px;
  }
  
  .feature-grid {
    grid-template-columns: 1fr;
  }
  
  .section-title h2 {
    font-size: 2rem;
  }
}

@media (min-width: 769px) and (max-width: 1024px) {
  .feature-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

.fade-in {
  opacity: 0;
  transform: translateY(30px);
  transition: all 0.6s ease;
}

.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

.highlight {
  color: var(--accent-color-orange);
  font-weight: bold;
}

::-webkit-scrollbar {
  width: 8px;
}

::-webkit-scrollbar-track {
  background: var(--main-bg-color);
}

::-webkit-scrollbar-thumb {
  background-color: var(--accent-color-green);
  border-radius: 4px;
  transition: background-color 0.3s;
}

::-webkit-scrollbar-thumb:hover {
  background-color: var(--accent-color-orange);
}