:root {
    --primary: #0f2027;
    --secondary: #203a43;
    --accent: #ff9800;
    --highlight: #00e676;
    --text: #ffffff;
    --bg-gradient: linear-gradient(135deg, var(--primary), var(--secondary), #2c5364);
    --card-bg: rgba(32, 58, 67, 0.8);
    --transition: all 0.3s ease;
  }

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

  body {
    font-family: 'Roboto', sans-serif;
    color: var(--text);
    background: var(--bg-gradient);
    line-height: 1.6;
    min-height: 100%;
    overflow-x: hidden;
  }

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

  .notice {
    background: rgba(0,0,0,0.2);
    padding: 15px;
    text-align: center;
    margin-bottom: 30px;
    border-radius: 8px;
    border-left: 4px solid var(--accent);
  }

  header {
    padding: 30px 0;
    text-align: center;
    position: relative;
  }

  header::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 200px;
    height: 3px;
    background: linear-gradient(90deg, transparent, var(--accent), transparent);
  }

  h1, h2, h3 {
    font-weight: 700;
    margin-bottom: 20px;
    color: var(--accent);
  }

  h1 {
    font-size: 2.5rem;
    background: linear-gradient(90deg, var(--accent), var(--highlight));
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    display: inline-block;
  }

  h2 {
    font-size: 1.8rem;
    position: relative;
    padding-bottom: 10px;
  }

  h2::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 60px;
    height: 3px;
    background: var(--highlight);
  }

  h3 {
    font-size: 1.4rem;
    margin-top: 30px;
  }

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

  a {
    color: var(--highlight);
    text-decoration: none;
    transition: var(--transition);
  }

  a:hover {
    color: var(--accent);
  }

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

  .card {
    background: var(--card-bg);
    border-radius: 10px;
    padding: 25px;
    box-shadow: 0 10px 20px rgba(0,0,0,0.2);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
  }

  .card::before {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: linear-gradient(
      transparent,
      rgba(255,255,255,0.1),
      transparent
    );
    transform: rotate(45deg);
    transition: var(--transition);
    opacity: 0;
  }

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

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

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

  .img-container {
    display: flex;
    justify-content: center;
    align-items: center;
    margin: 20px 0;
    gap: 20px;
    flex-wrap: wrap;
  }

  .img-box {
    width: 150px;
    height: 150px;
    border-radius: 15px;
    overflow: hidden;
    box-shadow: 0 5px 15px rgba(0,0,0,0.2);
    transition: var(--transition);
    position: relative;
  }

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

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

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

  pre {
    background: rgba(0,0,0,0.3);
    border-radius: 8px;
    padding: 20px;
    margin: 20px 0;
    overflow: auto;
    font-family: 'Courier New', monospace;
    position: relative;
    border-left: 4px solid var(--highlight);
  }

  pre::before {
    content: 'CSS';
    position: absolute;
    top: 0;
    right: 0;
    background: var(--highlight);
    color: var(--primary);
    padding: 2px 10px;
    font-size: 0.8rem;
    border-bottom-left-radius: 5px;
  }

  code {
    color: var(--highlight);
    font-family: 'Courier New', monospace;
  }

  .nav-links {
    display: flex;
    justify-content: center;
    gap: 20px;
    margin: 30px 0;
    flex-wrap: wrap;
  }

  .nav-link {
    padding: 10px 20px;
    background: rgba(255,255,255,0.1);
    border-radius: 30px;
    transition: var(--transition);
    position: relative;
    overflow: hidden;
  }

  .nav-link::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
    transition: var(--transition);
  }

  .nav-link:hover {
    background: rgba(255,255,255,0.2);
    transform: translateY(-3px);
  }

  .nav-link:hover::before {
    left: 100%;
  }

  footer {
    text-align: center;
    padding: 30px 0;
    margin-top: 50px;
    border-top: 1px solid rgba(255,255,255,0.1);
  }

  @media (max-width: 768px) {
    h1 {
      font-size: 2rem;
    }
    h2 {
      font-size: 1.5rem;
    }
    h3 {
      font-size: 1.2rem;
    }
    .grid {
      grid-template-columns: 1fr;
    }
  }