:root {
    --primary-dark: #0f0c29;
    --primary-darker: #080617;
    --accent-blue: #00C6FF;
    --accent-purple: #7B2CBF;
    --accent-pink: #E94584;
    --text-light: rgba(255,255,255,0.9);
    --text-lighter: rgba(255,255,255,0.7);
    --card-bg: rgba(30,30,30,0.8);
    --transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.1);
  }

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

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

  body {
    background: radial-gradient(ellipse at bottom, var(--primary-darker) 0%, var(--primary-dark) 100%);
    color: var(--text-light);
    font-family: 'Montserrat', sans-serif;
    line-height: 1.7;
    overflow-x: hidden;
    min-height: 100%;
    padding-bottom: 100px;
  }

  .header-notice {
    background: linear-gradient(90deg, var(--accent-blue), var(--accent-purple));
    color: white;
    text-align: center;
    padding: 12px;
    font-size: 14px;
    font-weight: 500;
    position: relative;
    z-index: 1000;
    box-shadow: 0 2px 20px rgba(0,198,255,0.3);
  }

  .hero {
    height: 80vh;
    max-height: 800px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    padding: 0 20px;
    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') center/cover no-repeat;
    opacity: 0.15;
    z-index: -1;
  }

  .hero h1 {
    font-size: clamp(2.5rem, 5vw, 4rem);
    margin-bottom: 1.5rem;
    background: linear-gradient(90deg, var(--accent-blue), var(--accent-pink));
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    text-shadow: 0 0 20px rgba(0,198,255,0.3);
  }

  .hero p {
    font-size: 1.2rem;
    max-width: 700px;
    margin-bottom: 2rem;
    color: var(--text-lighter);
  }

  .scroll-down {
    position: absolute;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    color: var(--text-lighter);
    font-size: 0.9rem;
    animation: bounce 2s infinite;
  }

  @keyframes bounce {
    0%, 20%, 50%, 80%, 100% {transform: translateY(0) translateX(-50%);}
    40% {transform: translateY(-20px) translateX(-50%);}
    60% {transform: translateY(-10px) translateX(-50%);}
  }

  .nav-container {
    position: fixed;
    top: 0;
    width: 100%;
    z-index: 1000;
    background: rgba(15,12,41,0.9);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid rgba(255,255,255,0.1);
    transition: var(--transition);
  }

  .nav-container.scrolled {
    background: rgba(8,6,23,0.95);
    box-shadow: 0 5px 30px rgba(0,0,0,0.3);
  }

  nav {
    max-width: 1200px;
    margin: 0 auto;
    padding: 1.5rem 2rem;
    display: flex;
    justify-content: space-between;
    align-items: center;
  }

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

  .logo span {
    display: inline-block;
    width: 10px;
    height: 10px;
    background: var(--accent-blue);
    border-radius: 50%;
    margin-right: 10px;
    animation: pulse 2s infinite;
  }

  @keyframes pulse {
    0% {box-shadow: 0 0 0 0 rgba(0,198,255,0.7);}
    70% {box-shadow: 0 0 0 10px rgba(0,198,255,0);}
    100% {box-shadow: 0 0 0 0 rgba(0,198,255,0);}
  }

  .nav-links {
    display: flex;
    list-style: none;
  }

  .nav-links li {
    margin-left: 2rem;
  }

  .nav-links a {
    color: var(--text-lighter);
    text-decoration: none;
    font-weight: 500;
    font-size: 0.95rem;
    position: relative;
    transition: var(--transition);
  }

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

  .nav-links a:hover {
    color: white;
  }

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

  .main-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 6rem 2rem 4rem;
  }

  article {
    background: var(--card-bg);
    border-radius: 15px;
    padding: 3rem;
    margin-bottom: 4rem;
    box-shadow: 0 10px 30px rgba(0,0,0,0.3);
    border: 1px solid rgba(255,255,255,0.05);
    transition: var(--transition);
  }

  article:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 40px rgba(0,198,255,0.2);
  }

  article h2 {
    font-size: 2.2rem;
    margin-bottom: 2rem;
    color: white;
    position: relative;
    padding-bottom: 1rem;
  }

  article h2::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 80px;
    height: 3px;
    background: linear-gradient(90deg, var(--accent-blue), var(--accent-purple));
    border-radius: 3px;
  }

  article h3 {
    font-size: 1.5rem;
    margin: 2rem 0 1.5rem;
    color: white;
  }

  article p {
    margin-bottom: 1.5rem;
    color: var(--text-lighter);
    font-size: 1.1rem;
  }

  pre {
    background: rgba(0,0,0,0.3);
    border-radius: 8px;
    padding: 1.5rem;
    margin: 2rem 0;
    overflow-x: auto;
    border-left: 4px solid var(--accent-blue);
    font-family: 'Courier New', monospace;
    font-size: 0.95rem;
    line-height: 1.6;
    position: relative;
  }

  pre::before {
    content: '';
    position: absolute;
    top: 0;
    right: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, rgba(0,198,255,0.05), rgba(123,44,191,0.05));
    z-index: -1;
    border-radius: 8px;
  }

  code {
    color: #f8f8f2;
    background: transparent;
    font-family: 'Courier New', monospace;
    padding: 0.2rem 0.4rem;
    border-radius: 4px;
  }

  .image-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 2rem;
    margin: 3rem 0;
  }

  .image-card {
    position: relative;
    border-radius: 10px;
    overflow: hidden;
    box-shadow: 0 5px 15px rgba(0,0,0,0.3);
    transition: var(--transition);
  }

  .image-card:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 30px rgba(0,198,255,0.3);
  }

  .image-card img {
    width: 100%;
    height: 200px;
    object-fit: cover;
    display: block;
    transition: var(--transition);
  }

  .image-card:hover img {
    transform: scale(1.05);
  }

  .image-card .overlay {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    background: linear-gradient(transparent, rgba(0,0,0,0.8));
    padding: 1.5rem;
    color: white;
  }

  .image-card h4 {
    margin-bottom: 0.5rem;
    font-size: 1.2rem;
  }

  .image-card p {
    font-size: 0.9rem;
    color: var(--text-lighter);
    margin-bottom: 0;
  }

  .tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-top: 1rem;
  }

  .tag {
    background: rgba(123,44,191,0.2);
    color: var(--accent-purple);
    padding: 0.3rem 0.8rem;
    border-radius: 20px;
    font-size: 0.75rem;
    font-weight: 500;
  }

  .footer {
    text-align: center;
    padding: 3rem 0;
    color: var(--text-lighter);
    font-size: 0.9rem;
  }

  @media (max-width: 768px) {
    .nav-links {
      display: none;
    }
    
    article {
      padding: 2rem;
    }
    
    .image-grid {
      grid-template-columns: 1fr;
    }
  }

  /* Animation classes */
  .fade-in {
    opacity: 0;
    transform: translateY(30px);
    transition: var(--transition);
  }

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

  /* Floating elements */
  .floating {
    position: absolute;
    border-radius: 50%;
    background: rgba(0,198,255,0.1);
    filter: blur(40px);
    z-index: -1;
  }

  .floating-1 {
    width: 300px;
    height: 300px;
    top: 20%;
    left: 10%;
    animation: float 15s infinite ease-in-out;
  }

  .floating-2 {
    width: 400px;
    height: 400px;
    bottom: 10%;
    right: 10%;
    animation: float 20s infinite ease-in-out reverse;
  }

  @keyframes float {
    0%, 100% { transform: translateY(0) translateX(0); }
    50% { transform: translateY(-50px) translateX(50px); }
  }