:root {
  --primary: #2c3e50;
  --secondary: #34495e;
  --accent: #e67e22;
  --light: #ecf0f1;
  --dark: #1a252f;
  --success: #27ae60;
  --warning: #f39c12;
  --danger: #e74c3c;
  --radius: 10px;
  --shadow: 0 4px 20px rgba(0,0,0,0.1);
  --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', 'Helvetica', sans-serif;
  background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
  color: var(--dark);
  line-height: 1.6;
  padding-top: 80px;
}

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

/* Header Styles */
.header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  background: rgba(44, 62, 80, 0.95);
  backdrop-filter: blur(10px);
  box-shadow: var(--shadow);
  z-index: 1000;
  padding: 15px 0;
  transition: var(--transition);
}

.header.scrolled {
  padding: 10px 0;
  background: rgba(26, 37, 47, 0.98);
}

.header-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

.logo {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--light);
  text-decoration: none;
  display: flex;
  align-items: center;
}

.logo-icon {
  width: 30px;
  height: 30px;
  margin-right: 10px;
  background: var(--accent);
  border-radius: 50%;
  display: inline-block;
}

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

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

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

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

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

/* Hero Section */
.hero {
  padding: 80px 0;
  background: radial-gradient(circle at top right, rgba(52, 152, 219, 0.1) 0%, rgba(0, 0, 0, 0) 50%);
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: url('https://images.gptkong.com/demo/sample1.png') no-repeat;
  background-size: 40%;
  background-position: 120% center;
  opacity: 0.1;
  z-index: -1;
}

.hero-content {
  max-width: 600px;
}

.hero-title {
  font-size: 3rem;
  font-weight: 700;
  margin-bottom: 20px;
  color: var(--primary);
  line-height: 1.2;
  background: linear-gradient(45deg, var(--primary), var(--secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.hero-subtitle {
  font-size: 1.2rem;
  color: var(--secondary);
  margin-bottom: 30px;
  font-weight: 300;
}

.notice-banner {
  background: rgba(231, 126, 34, 0.1);
  border-left: 4px solid var(--accent);
  padding: 15px;
  margin: 40px 0;
  border-radius: 0 var(--radius) var(--radius) 0;
}

.notice-text {
  color: var(--secondary);
  font-weight: 500;
}

/* Article Styles */
.article {
  background: white;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 40px;
  margin-bottom: 60px;
  position: relative;
  overflow: hidden;
}

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

.article h2 {
  font-size: 2rem;
  margin-bottom: 30px;
  color: var(--primary);
  position: relative;
  padding-bottom: 15px;
}

.article h2::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 80px;
  height: 3px;
  background: linear-gradient(to right, var(--accent), var(--warning));
}

.article h3 {
  font-size: 1.5rem;
  margin: 30px 0 20px;
  color: var(--secondary);
}

.article p {
  margin-bottom: 20px;
  font-size: 1.1rem;
}

/* Code Block Styles */
pre {
  background: #282c34;
  border-radius: var(--radius);
  padding: 20px;
  margin: 30px 0;
  overflow-x: auto;
  box-shadow: var(--shadow);
  position: relative;
}

pre::before {
  content: '';
  position: absolute;
  top: 10px;
  left: 10px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: #ff5f56;
  box-shadow: 20px 0 0 #ffbd2e, 40px 0 0 #27c93f;
}

code {
  font-family: 'Fira Code', monospace;
  color: #abb2bf;
  font-size: 0.9rem;
  line-height: 1.5;
}

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

.gallery-item {
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
  transition: var(--transition);
  position: relative;
}

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

.gallery-item img {
  width: 100%;
  height: 250px;
  object-fit: cover;
  display: block;
  transition: var(--transition);
}

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

.gallery-caption {
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  padding: 15px;
  background: linear-gradient(to top, rgba(0,0,0,0.7), transparent);
  color: white;
  opacity: 0;
  transition: var(--transition);
}

.gallery-item:hover .gallery-caption {
  opacity: 1;
}

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

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

.card:hover {
  transform: translateY(-10px);
  box-shadow: 0 15px 30px rgba(0,0,0,0.15);
}

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

.card-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: var(--transition);
}

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

.card-content {
  padding: 20px;
}

.card-title {
  font-size: 1.3rem;
  margin-bottom: 15px;
  color: var(--primary);
}

.card-text {
  color: var(--secondary);
  margin-bottom: 20px;
}

/* Footer Styles */
.footer {
  background: var(--primary);
  color: var(--light);
  padding: 60px 0 30px;
  position: relative;
}

.footer::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 10px;
  background: linear-gradient(to right, var(--accent), var(--warning));
}

.footer-container {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 40px;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

.footer-logo {
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: 20px;
  display: inline-block;
}

.footer-text {
  opacity: 0.8;
  margin-bottom: 20px;
  line-height: 1.7;
}

.footer-links {
  display: flex;
  flex-direction: column;
  gap: 15px;
}

.footer-link {
  color: var(--light);
  text-decoration: none;
  transition: var(--transition);
  opacity: 0.8;
}

.footer-link:hover {
  color: var(--accent);
  opacity: 1;
  padding-left: 5px;
}

.footer-bottom {
  text-align: center;
  padding-top: 40px;
  margin-top: 40px;
  border-top: 1px solid rgba(255,255,255,0.1);
  opacity: 0.6;
  font-size: 0.9rem;
}

/* Responsive Adjustments */
@media (max-width: 768px) {
  .hero-title {
    font-size: 2.2rem;
  }
  
  .hero-subtitle {
    font-size: 1rem;
  }
  
  .nav-links {
    display: none;
  }
  
  .article {
    padding: 30px 20px;
  }
  
  .article h2 {
    font-size: 1.8rem;
  }
  
  .article h3 {
    font-size: 1.3rem;
  }
}

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

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

@keyframes pulse {
  0%, 100% {
    transform: scale(1);
  }
  50% {
    transform: scale(1.05);
  }
}

.pulsing {
  animation: pulse 3s ease-in-out infinite;
}