:root {
    --primary-color: #032B44;
    --secondary-color: #1E90FF;
    --accent-color: #FFA500;
    --text-light: #f0f0f0;
    --text-dark: #333333;
    --card-bg: #ffffff;
    --sidebar-bg: #021F33;
    --success-color: #28a745;
    --loader-color: #f3f3f3;
  }

  @font-face {
    font-family: 'Roboto';
    src: local('Roboto Bold'), local('Roboto-Bold');
    font-weight: bold;
  }

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

  body {
    background: linear-gradient(135deg, var(--primary-color) 0%, #021F33 100%);
    color: var(--text-light);
    font-family: 'Helvetica', sans-serif;
    line-height: 1.6;
    padding-top: 80px;
    min-height: 100%;
    overflow-x: hidden;
  }

  .design-notice {
    position: fixed;
    bottom: 20px;
    right: 20px;
    background: rgba(255,255,255,0.9);
    color: var(--primary-color);
    padding: 10px 15px;
    border-radius: 20px;
    font-size: 14px;
    z-index: 1000;
    box-shadow: 0 4px 12px rgba(0,0,0,0.15);
  }

  .navbar {
    position: fixed;
    top: 0;
    width: 100%;
    background: linear-gradient(to right, var(--primary-color), #05456B);
    padding: 15px 5%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    z-index: 1000;
    box-shadow: 0 4px 12px rgba(0,0,0,0.2);
  }

  .nav-logo {
    font-family: 'Roboto', sans-serif;
    font-weight: bold;
    font-size: 24px;
    color: white;
    text-decoration: none;
  }

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

  .nav-link {
    color: white;
    text-decoration: none;
    font-weight: 500;
    position: relative;
    transition: color 0.3s ease;
  }

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

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

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

  .sidebar-toggle {
    display: none;
    background: none;
    border: none;
    color: white;
    font-size: 24px;
    cursor: pointer;
  }

  .sidebar {
    position: fixed;
    left: -300px;
    top: 80px;
    width: 300px;
    height: calc(100% - 80px);
    background: var(--sidebar-bg);
    transition: left 0.4s cubic-bezier(0.4, 0, 0.2, 1);
    padding: 30px;
    z-index: 999;
    box-shadow: 4px 0 12px rgba(0,0,0,0.15);
  }

  .sidebar.active {
    left: 0;
  }

  .sidebar-link {
    display: block;
    color: var(--text-light);
    text-decoration: none;
    margin: 20px 0;
    padding: 10px 15px;
    border-radius: 6px;
    transition: all 0.3s ease;
  }

  .sidebar-link:hover {
    background: rgba(255,255,255,0.1);
    color: var(--accent-color);
    transform: translateX(5px);
  }

  .main-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 40px 5%;
  }

  article {
    background: rgba(255,255,255,0.05);
    backdrop-filter: blur(10px);
    border-radius: 16px;
    padding: 40px;
    margin-bottom: 60px;
    box-shadow: 0 8px 32px rgba(0,0,0,0.2);
    border: 1px solid rgba(255,255,255,0.1);
  }

  h1, h2, h3 {
    font-family: 'Roboto', sans-serif;
    font-weight: bold;
    color: white;
    margin-bottom: 20px;
    position: relative;
  }

  h2 {
    font-size: 28px;
    padding-bottom: 10px;
  }

  h2::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    width: 60px;
    height: 3px;
    background: linear-gradient(to right, var(--secondary-color), var(--accent-color));
    border-radius: 3px;
  }

  h3 {
    font-size: 22px;
    margin-top: 40px;
  }

  p {
    margin-bottom: 20px;
    font-size: 16px;
    color: var(--text-light);
  }

  strong {
    color: var(--secondary-color);
  }

  code {
    font-family: 'Courier New', monospace;
    background: rgba(0,0,0,0.3);
    padding: 2px 6px;
    border-radius: 4px;
    color: #f8f8f2;
  }

  pre {
    background: #011627;
    border-radius: 8px;
    padding: 20px;
    margin: 25px 0;
    overflow: auto;
    box-shadow: inset 0 0 10px rgba(0,0,0,0.5);
    border-left: 4px solid var(--secondary-color);
  }

  pre code {
    background: transparent;
    padding: 0;
    border-radius: 0;
    color: inherit;
  }

  .code-block {
    position: relative;
  }

  .code-block::before {
    content: 'CSS';
    position: absolute;
    top: -10px;
    left: 20px;
    background: var(--secondary-color);
    color: white;
    padding: 2px 10px;
    border-radius: 4px;
    font-size: 12px;
    font-weight: bold;
  }

  .image-gallery {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 20px;
    margin: 40px 0;
  }

  .gallery-item {
    border-radius: 12px;
    overflow: hidden;
    box-shadow: 0 8px 16px rgba(0,0,0,0.2);
    transition: transform 0.3s ease, box-shadow 0.3s ease;
  }

  .gallery-item:hover {
    transform: translateY(-5px);
    box-shadow: 0 12px 24px rgba(0,0,0,0.3);
  }

  .gallery-item img {
    width: 100%;
    height: auto;
    display: block;
    transition: transform 0.5s ease;
  }

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

  table {
    width: 100%;
    border-collapse: collapse;
    margin: 30px 0;
    background: rgba(255,255,255,0.05);
    border-radius: 8px;
    overflow: hidden;
  }

  th, td {
    padding: 15px;
    text-align: left;
    border-bottom: 1px solid rgba(255,255,255,0.1);
  }

  th {
    background: rgba(0,0,0,0.3);
    font-weight: bold;
    color: var(--secondary-color);
  }

  tr:hover {
    background: rgba(255,255,255,0.03);
  }

  .btn {
    display: inline-block;
    padding: 12px 24px;
    border-radius: 6px;
    font-weight: bold;
    text-decoration: none;
    transition: all 0.3s ease;
    margin: 10px 5px;
  }

  .btn-primary {
    background: var(--secondary-color);
    color: white;
  }

  .btn-primary:hover {
    background: #1C86EE;
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(30, 144, 255, 0.3);
  }

  .btn-accent {
    background: var(--accent-color);
    color: var(--text-dark);
  }

  .btn-accent:hover {
    background: #FF8C00;
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(255, 165, 0, 0.3);
  }

  .success-icon {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    background: var(--success-color);
    display: flex;
    justify-content: center;
    align-items: center;
    margin: 20px auto;
    animation: fadeIn 0.5s cubic-bezier(0.4, 0, 0.2, 1);
  }

  .success-icon::before {
    content: '✓';
    color: white;
    font-size: 30px;
    font-weight: bold;
  }

  .loader {
    border: 4px solid var(--loader-color);
    border-top: 4px solid var(--secondary-color);
    border-radius: 50%;
    width: 50px;
    height: 50px;
    animation: spin 1s linear infinite;
    margin: 20px auto;
  }

  @keyframes fadeIn {
    from { opacity: 0; transform: scale(0.8); }
    to { opacity: 1; transform: scale(1); }
  }

  @keyframes spin {
    from { transform: rotate(0deg); }
    to { transform: rotate(360deg); }
  }

  .accordion {
    margin: 30px 0;
  }

  .accordion-item {
    margin-bottom: 10px;
    border-radius: 8px;
    overflow: hidden;
    background: rgba(255,255,255,0.05);
  }

  .accordion-header {
    padding: 15px 20px;
    background: rgba(0,0,0,0.2);
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    transition: background 0.3s ease;
  }

  .accordion-header:hover {
    background: rgba(0,0,0,0.3);
  }

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

  .accordion-item.active .accordion-content {
    max-height: 500px;
    padding: 20px;
  }

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

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

  footer {
    background: rgba(0,0,0,0.3);
    padding: 30px 5%;
    text-align: center;
    margin-top: 60px;
  }

  .footer-links {
    display: flex;
    justify-content: center;
    gap: 30px;
    margin-bottom: 20px;
  }

  .footer-link {
    color: var(--text-light);
    text-decoration: none;
    transition: color 0.3s ease;
  }

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

  @media (max-width: 992px) {
    .nav-menu {
      gap: 20px;
    }
  }

  @media (max-width: 768px) {
    .navbar {
      padding: 15px 20px;
    }

    .nav-menu {
      display: none;
    }

    .sidebar-toggle {
      display: block;
    }

    .main-content {
      padding: 30px 20px;
    }

    article {
      padding: 30px;
    }

    .image-gallery {
      grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    }
  }

  @media (max-width: 576px) {
    h2 {
      font-size: 24px;
    }

    h3 {
      font-size: 20px;
    }

    .image-gallery {
      grid-template-columns: 1fr;
    }

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