:root {
  --main-color: #0A2540;
  --accent-color: #00A8E8;
  --light-gray: #CED2D2;
  --highlight: rgba(0, 168, 232, 0.1);
}

body {
  margin: 0;
  font-family: 'Roboto', sans-serif;
  background: linear-gradient(135deg, var(--main-color), #0d2d52);
  color: var(--light-gray);
  line-height: 1.6;
  overflow-x: hidden;
}

.header {
  position: relative;
  height: 80vh;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 0 5%;
  background: radial-gradient(circle at 50% 50%, rgba(0, 168, 232, 0.1), transparent 70%);
}

.header::before {
  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: 0.15;
  z-index: -1;
}

.navbar {
  position: fixed;
  top: 0;
  width: 100%;
  padding: 20px 5%;
  background: rgba(10, 37, 64, 0.7);
  backdrop-filter: blur(10px);
  z-index: 1000;
  transition: all 0.3s ease;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.navbar.scrolled {
  background: var(--main-color);
  padding: 15px 5%;
  box-shadow: 0 5px 20px rgba(0, 0, 0, 0.2);
}

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

.nav-links a {
  color: var(--light-gray);
  text-decoration: none;
  font-weight: 500;
  position: relative;
  transition: all 0.3s ease;
}

.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -5px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--accent-color);
  transition: width 0.3s ease;
}

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

.header-content {
  max-width: 800px;
  position: relative;
  z-index: 1;
}

.header-title {
  font-size: 3.5rem;
  margin-bottom: 20px;
  background: linear-gradient(90deg, var(--accent-color), var(--light-gray));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  text-shadow: 0 0 20px rgba(0, 168, 232, 0.3);
}

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

.notice-banner {
  background: rgba(255, 255, 255, 0.1);
  padding: 15px;
  border-radius: 8px;
  margin-bottom: 40px;
  border-left: 4px solid var(--accent-color);
}

.main-content {
  max-width: 1200px;
  margin: 0 auto;
  padding: 100px 5% 50px;
}

article {
  background: rgba(10, 37, 64, 0.7);
  backdrop-filter: blur(10px);
  border-radius: 15px;
  padding: 40px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
  margin-bottom: 50px;
}

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

article h2::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100px;
  height: 3px;
  background: linear-gradient(90deg, var(--accent-color), transparent);
}

article h3 {
  font-size: 1.5rem;
  color: var(--light-gray);
  margin: 40px 0 20px;
}

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

pre {
  background: rgba(0, 0, 0, 0.3);
  border-radius: 8px;
  padding: 20px;
  overflow-x: auto;
  margin: 30px 0;
  border-left: 4px solid var(--accent-color);
}

code {
  font-family: 'Courier New', monospace;
  color: var(--light-gray);
  font-size: 0.9rem;
}

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

.card {
  background: rgba(10, 37, 64, 0.5);
  border-radius: 10px;
  padding: 30px;
  transition: all 0.3s ease;
  border: 1px solid rgba(0, 168, 232, 0.2);
  position: relative;
  overflow: hidden;
}

.card::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: linear-gradient(45deg, transparent, rgba(0, 168, 232, 0.1), transparent);
  transform: rotate(45deg);
  transition: all 0.6s ease;
  opacity: 0;
}

.card:hover::before {
  opacity: 1;
  animation: shine 1.5s;
}

@keyframes shine {
  0% { left: -50%; top: -50%; }
  100% { left: 150%; top: 150%; }
}

.card:hover {
  transform: translateY(-5px);
  box-shadow: 0 15px 30px rgba(0, 168, 232, 0.2);
  border-color: rgba(0, 168, 232, 0.5);
}

.card-img {
  width: 100%;
  height: 200px;
  object-fit: cover;
  border-radius: 8px;
  margin-bottom: 20px;
  box-shadow: 0 5px 15px rgba(0, 0, 0, 0.3);
  transition: all 0.3s ease;
}

.card:hover .card-img {
  transform: scale(1.03);
}

table {
  width: 100%;
  border-collapse: collapse;
  margin: 30px 0;
  background: rgba(10, 37, 64, 0.5);
  border-radius: 8px;
  overflow: hidden;
}

th, td {
  padding: 15px;
  text-align: left;
  border-bottom: 1px solid rgba(0, 168, 232, 0.2);
}

th {
  background: rgba(0, 168, 232, 0.2);
  color: var(--accent-color);
}

tr:hover {
  background: rgba(0, 168, 232, 0.1);
}

.button {
  display: inline-block;
  background: linear-gradient(90deg, var(--accent-color), var(--light-gray));
  border: none;
  padding: 12px 25px;
  border-radius: 30px;
  color: var(--main-color);
  font-weight: bold;
  cursor: pointer;
  transition: all 0.3s ease;
  box-shadow: 0 5px 15px rgba(0, 168, 232, 0.3);
  text-decoration: none;
  margin: 10px 0;
}

.button:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 20px rgba(0, 168, 232, 0.4);
  background: linear-gradient(90deg, var(--light-gray), var(--accent-color));
}

.footer {
  background: rgba(10, 37, 64, 0.9);
  padding: 50px 5%;
  text-align: center;
  margin-top: 50px;
}

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

.section.visible {
  opacity: 1;
  transform: translateY(0);
}

@media (max-width: 768px) {
  .header-title {
    font-size: 2.5rem;
  }
  
  .header-subtitle {
    font-size: 1rem;
  }
  
  .nav-links {
    display: none;
  }
  
  .grid-container {
    grid-template-columns: 1fr;
  }
  
  article {
    padding: 25px;
  }
  
  article h2 {
    font-size: 1.8rem;
  }
  
  article h3 {
    font-size: 1.3rem;
  }
}

.particle {
  position: absolute;
  width: 2px;
  height: 2px;
  background: var(--accent-color);
  border-radius: 50%;
  opacity: 0.7;
  animation: move 8s infinite linear;
}

@keyframes move {
  0% { transform: translate(0, 0); opacity: 0; }
  10% { opacity: 0.7; }
  90% { opacity: 0.7; }
  100% { transform: translate(100vw, -100vh); opacity: 0; }
}

.toc {
  position: fixed;
  right: 30px;
  top: 50%;
  transform: translateY(-50%);
  background: rgba(10, 37, 64, 0.7);
  backdrop-filter: blur(10px);
  border-radius: 10px;
  padding: 20px;
  box-shadow: 0 5px 20px rgba(0, 0, 0, 0.2);
  z-index: 100;
  display: none;
}

.toc ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.toc li {
  margin-bottom: 10px;
}

.toc a {
  color: var(--light-gray);
  text-decoration: none;
  transition: all 0.3s ease;
  display: block;
  padding: 5px 10px;
  border-radius: 5px;
}

.toc a:hover {
  background: rgba(0, 168, 232, 0.2);
  color: var(--accent-color);
}

@media (min-width: 1024px) {
  .toc {
    display: block;
  }
}

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

.gallery-img {
  width: 100%;
  height: 250px;
  object-fit: cover;
  border-radius: 10px;
  transition: all 0.3s ease;
  box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
}

.gallery-img:hover {
  transform: scale(1.03);
  box-shadow: 0 10px 25px rgba(0, 168, 232, 0.3);
}

.collapsible {
  background: rgba(10, 37, 64, 0.5);
  border-radius: 8px;
  margin: 20px 0;
  overflow: hidden;
}

.collapsible-header {
  padding: 15px 20px;
  cursor: pointer;
  display: flex;
  justify-content: space-between;
  align-items: center;
  background: rgba(0, 168, 232, 0.1);
  transition: all 0.3s ease;
}

.collapsible-header:hover {
  background: rgba(0, 168, 232, 0.2);
}

.collapsible-content {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.3s ease;
  padding: 0 20px;
}

.collapsible.active .collapsible-content {
  max-height: 1000px;
  padding: 20px;
}

.collapsible-icon {
  transition: transform 0.3s ease;
}

.collapsible.active .collapsible-icon {
  transform: rotate(180deg);
}