:root {
  --primary-color: #003366;
  --secondary-color: #00c6ff;
  --accent-color: #FFA500;
  --bg-light: #f5f5f5;
  --text-dark: #333333;
  --text-light: #ffffff;
  --card-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
  --transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

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

body {
  font-family: 'Roboto', sans-serif;
  line-height: 1.7;
  color: var(--text-dark);
  background: linear-gradient(135deg, #f9f9f9 0%, #eef2f5 100%);
  overflow-x: hidden;
}

.header {
  background: linear-gradient(90deg, var(--primary-color) 0%, #004080 100%);
  padding: 2rem 5%;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
  position: relative;
  z-index: 100;
}

.header::after {
  content: '';
  position: absolute;
  bottom: -10px;
  left: 0;
  width: 100%;
  height: 10px;
  background: linear-gradient(90deg, var(--secondary-color) 0%, rgba(0,198,255,0) 100%);
  opacity: 0.7;
}

.nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  max-width: 1400px;
  margin: 0 auto;
}

.logo {
  color: var(--text-light);
  font-size: 1.8rem;
  font-weight: 700;
  letter-spacing: 1px;
  text-decoration: none;
  display: flex;
  align-items: center;
}

.logo-icon {
  width: 40px;
  height: 40px;
  margin-right: 10px;
  background: var(--secondary-color);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 0 0 4px rgba(0,198,255,0.3);
}

.nav-links {
  display: flex;
  gap: 2rem;
}

.nav-link {
  color: rgba(255,255,255,0.8);
  text-decoration: none;
  font-weight: 500;
  letter-spacing: 0.5px;
  transition: var(--transition);
  position: relative;
}

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

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

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

.notice {
  background: rgba(255,255,255,0.2);
  padding: 1rem;
  border-radius: 8px;
  margin-top: 1rem;
  text-align: center;
  backdrop-filter: blur(5px);
  border: 1px solid rgba(255,255,255,0.1);
}

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

.container {
  max-width: 1200px;
  margin: 3rem auto;
  padding: 0 2rem;
}

.hero {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  align-items: center;
  margin-bottom: 5rem;
  position: relative;
}

.hero::before {
  content: '';
  position: absolute;
  top: -100px;
  left: -100px;
  width: 300px;
  height: 300px;
  background: radial-gradient(circle, rgba(0,198,255,0.1) 0%, rgba(0,198,255,0) 70%);
  z-index: -1;
}

.hero-content {
  position: relative;
}

.hero-title {
  font-size: 3rem;
  font-weight: 700;
  line-height: 1.2;
  margin-bottom: 1.5rem;
  background: linear-gradient(90deg, var(--primary-color) 0%, var(--secondary-color) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.hero-text {
  font-size: 1.1rem;
  color: #555;
  margin-bottom: 2rem;
}

.hero-image {
  position: relative;
  height: 400px;
  border-radius: 20px;
  overflow: hidden;
  box-shadow: var(--card-shadow);
  transition: var(--transition);
}

.hero-image:hover {
  transform: translateY(-10px);
}

.hero-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.features {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
  margin: 5rem 0;
}

.feature-card {
  background: white;
  border-radius: 15px;
  padding: 2rem;
  box-shadow: var(--card-shadow);
  transition: var(--transition);
  position: relative;
  overflow: hidden;
}

.feature-card:hover {
  transform: translateY(-10px);
  box-shadow: 0 15px 40px rgba(0, 0, 0, 0.15);
}

.feature-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 5px;
  height: 100%;
  background: linear-gradient(to bottom, var(--primary-color), var(--secondary-color));
}

.feature-icon {
  width: 60px;
  height: 60px;
  background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
  border-radius: 15px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 1.5rem;
  box-shadow: 0 5px 15px rgba(0, 51, 102, 0.2);
}

.feature-title {
  font-size: 1.3rem;
  font-weight: 700;
  margin-bottom: 1rem;
  color: var(--primary-color);
}

.feature-text {
  color: #666;
  margin-bottom: 1.5rem;
}

.article-container {
  background: white;
  border-radius: 20px;
  padding: 3rem;
  box-shadow: var(--card-shadow);
  margin: 5rem 0;
}

article {
  max-width: 900px;
  margin: 0 auto;
}

article h2 {
  font-size: 2rem;
  color: var(--primary-color);
  margin-bottom: 2rem;
  position: relative;
  padding-bottom: 1rem;
}

article h2::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100px;
  height: 4px;
  background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
  border-radius: 2px;
}

article h3 {
  font-size: 1.5rem;
  color: var(--primary-color);
  margin: 2rem 0 1rem;
}

article p {
  margin-bottom: 1.5rem;
  color: #555;
  font-size: 1.1rem;
}

pre {
  background: #f8f8f8;
  border-radius: 10px;
  padding: 1.5rem;
  overflow-x: auto;
  margin: 2rem 0;
  border-left: 4px solid var(--secondary-color);
  box-shadow: inset 0 1px 3px rgba(0,0,0,0.1);
}

code {
  font-family: 'Courier New', monospace;
  color: #333;
}

.color {
  font-weight: 700;
  background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.gallery {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 1.5rem;
  margin: 3rem 0;
}

.gallery-item {
  border-radius: 15px;
  overflow: hidden;
  box-shadow: 0 5px 15px rgba(0,0,0,0.1);
  transition: var(--transition);
  height: 250px;
}

.gallery-item:hover {
  transform: scale(1.03);
  box-shadow: 0 10px 25px rgba(0,0,0,0.15);
}

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

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

.footer {
  background: linear-gradient(90deg, var(--primary-color) 0%, #002244 100%);
  color: white;
  padding: 3rem 0;
  text-align: center;
  margin-top: 5rem;
}

.footer-content {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 2rem;
}

.footer-links {
  display: flex;
  justify-content: center;
  gap: 2rem;
  margin: 2rem 0;
}

.footer-link {
  color: rgba(255,255,255,0.7);
  text-decoration: none;
  transition: var(--transition);
}

.footer-link:hover {
  color: var(--text-light);
}

.copyright {
  margin-top: 2rem;
  color: rgba(255,255,255,0.5);
  font-size: 0.9rem;
}

@media (max-width: 992px) {
  .hero {
    grid-template-columns: 1fr;
  }
  
  .hero-image {
    order: -1;
  }
}

@media (max-width: 768px) {
  .nav {
    flex-direction: column;
    gap: 1rem;
  }
  
  .nav-links {
    flex-wrap: wrap;
    justify-content: center;
  }
  
  .hero-title {
    font-size: 2.2rem;
  }
  
  .article-container {
    padding: 2rem;
  }
}

@media (max-width: 480px) {
  .header {
    padding: 1.5rem;
  }
  
  .hero-title {
    font-size: 1.8rem;
  }
  
  .hero-image {
    height: 300px;
  }
  
  .features {
    grid-template-columns: 1fr;
  }
  
  .article-container {
    padding: 1.5rem;
  }
}

/* Animations */
@keyframes float {
  0%, 100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-10px);
  }
}

@keyframes wave {
  0% {
    transform: translateX(0);
  }
  100% {
    transform: translateX(-100%);
  }
}

.wave-animation {
  position: absolute;
  bottom: 0;
  left: 0;
  width: 200%;
  height: 100px;
  background: linear-gradient(90deg, var(--secondary-color) 0%, rgba(0,198,255,0) 50%, var(--secondary-color) 100%);
  opacity: 0.1;
  animation: wave 15s linear infinite;
}

.floating {
  animation: float 4s ease-in-out infinite;
}