:root {
    --primary: #0d47a1;
    --secondary: #1e88e5;
    --accent: #00e676;
    --dark: #121a2e;
    --light: #f5f8fa;
    --text: #e0e0e0;
    --highlight: #00c853;
  }

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

  html {
    scroll-behavior: smooth;
    font-size: 16px;
  }

  body {
    font-family: 'Roboto', sans-serif;
    background: var(--dark);
    color: var(--text);
    line-height: 1.6;
    overflow-x: hidden;
    background-image: 
      radial-gradient(circle at 20% 30%, rgba(29, 78, 216, 0.15) 0%, transparent 50%),
      radial-gradient(circle at 80% 70%, rgba(16, 185, 129, 0.15) 0%, transparent 50%);
  }

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

  .hero {
    height: 80vh;
    display: flex;
    align-items: center;
    justify-content: center;
    text-align: center;
    position: relative;
    overflow: hidden;
  }

  .hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, rgba(13, 71, 161, 0.8) 0%, rgba(30, 136, 229, 0.6) 50%, rgba(0, 200, 83, 0.4) 100%);
    z-index: -1;
  }

  .hero-content {
    max-width: 800px;
    padding: 40px;
    background: rgba(18, 26, 46, 0.7);
    border-radius: 16px;
    backdrop-filter: blur(10px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
    transform: translateY(0);
    transition: transform 0.5s ease;
  }

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

  h1, h2, h3, h4 {
    font-weight: 700;
    margin-bottom: 1.5rem;
    color: white;
    line-height: 1.2;
  }

  h1 {
    font-size: 3.5rem;
    background: linear-gradient(90deg, #00e676, #1e88e5);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    margin-bottom: 1rem;
  }

  h2 {
    font-size: 2.5rem;
    margin-top: 3rem;
    position: relative;
    padding-bottom: 1rem;
  }

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

  h3 {
    font-size: 1.8rem;
    margin-top: 2.5rem;
    color: var(--accent);
  }

  p {
    margin-bottom: 1.5rem;
    font-size: 1.1rem;
    font-weight: 300;
  }

  a {
    color: var(--accent);
    text-decoration: none;
    transition: all 0.3s ease;
  }

  a:hover {
    color: var(--highlight);
    text-decoration: underline;
  }

  .grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
    margin: 3rem 0;
  }

  .card {
    background: rgba(255, 255, 255, 0.05);
    border-radius: 12px;
    padding: 30px;
    transition: all 0.3s ease;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.1);
    backdrop-filter: blur(5px);
  }

  .card:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 30px rgba(0, 0, 0, 0.2);
    border-color: rgba(0, 230, 118, 0.3);
  }

  .img-container {
    width: 100%;
    height: 200px;
    border-radius: 8px;
    overflow: hidden;
    margin-bottom: 20px;
    position: relative;
  }

  .img-container img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: transform 0.5s ease;
  }

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

  .img-container::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, rgba(0, 230, 118, 0.2), rgba(30, 136, 229, 0.2));
    opacity: 0;
    transition: opacity 0.3s ease;
  }

  .img-container:hover::after {
    opacity: 1;
  }

  code {
    font-family: 'Fira Code', monospace;
    background: rgba(0, 0, 0, 0.3);
    padding: 2px 6px;
    border-radius: 4px;
    font-size: 0.9em;
    color: var(--accent);
  }

  pre {
    background: #1a2238;
    padding: 20px;
    border-radius: 8px;
    overflow-x: auto;
    margin: 2rem 0;
    box-shadow: inset 0 0 10px rgba(0, 0, 0, 0.5);
    border-left: 4px solid var(--accent);
  }

  pre code {
    background: transparent;
    padding: 0;
    color: #e0e0e0;
    font-size: 0.95rem;
    line-height: 1.5;
  }

  .nav {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    padding: 20px 40px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    z-index: 1000;
    background: rgba(18, 26, 46, 0.9);
    backdrop-filter: blur(10px);
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.2);
  }

  .nav-logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: white;
    display: flex;
    align-items: center;
  }

  .nav-logo span {
    color: var(--accent);
  }

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

  .nav-link {
    color: var(--text);
    font-weight: 500;
    position: relative;
    padding: 5px 0;
  }

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

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

  .nav-link:hover {
    color: white;
    text-decoration: none;
  }

  .mobile-menu-btn {
    display: none;
    background: none;
    border: none;
    color: white;
    font-size: 1.5rem;
    cursor: pointer;
  }

  .section {
    padding: 100px 0;
    position: relative;
  }

  .section:nth-child(even) {
    background: rgba(255, 255, 255, 0.02);
  }

  .footer {
    background: #0a0f1f;
    padding: 50px 0;
    text-align: center;
  }

  .footer p {
    margin-bottom: 0;
    color: rgba(255, 255, 255, 0.6);
  }

  .btn {
    display: inline-block;
    padding: 12px 30px;
    background: linear-gradient(90deg, var(--accent), var(--highlight));
    color: white;
    border-radius: 50px;
    font-weight: 500;
    text-transform: uppercase;
    letter-spacing: 1px;
    transition: all 0.3s ease;
    box-shadow: 0 5px 15px rgba(0, 200, 83, 0.3);
    border: none;
    cursor: pointer;
    margin-top: 20px;
  }

  .btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 8px 20px rgba(0, 200, 83, 0.4);
    color: white;
    text-decoration: none;
  }

  .note {
    background: rgba(0, 230, 118, 0.1);
    border-left: 4px solid var(--accent);
    padding: 20px;
    margin: 2rem 0;
    border-radius: 0 8px 8px 0;
  }

  .note p {
    margin-bottom: 0;
    color: rgba(224, 224, 224, 0.9);
  }

  .scroll-indicator {
    position: absolute;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    color: white;
    font-size: 1.5rem;
    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%);
    }
  }

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

  @media (max-width: 768px) {
    .nav-links {
      display: none;
    }
    .mobile-menu-btn {
      display: block;
    }
    h1 {
      font-size: 2.5rem;
    }
    h2 {
      font-size: 2rem;
    }
    .hero {
      height: auto;
      padding: 100px 0;
    }
  }

  @media (max-width: 576px) {
    .container {
      padding: 0 15px;
    }
    h1 {
      font-size: 2rem;
    }
    h2 {
      font-size: 1.8rem;
    }
    .section {
      padding: 60px 0;
    }
  }

  /* Animation classes */
  .fade-in {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.6s ease, transform 0.6s ease;
  }

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

  /* Crypto specific styles */
  .crypto-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    gap: 20px;
    margin: 2rem 0;
  }

  .crypto-card {
    background: rgba(255, 255, 255, 0.05);
    border-radius: 12px;
    padding: 20px;
    transition: all 0.3s ease;
    border: 1px solid rgba(255, 255, 255, 0.1);
  }

  .crypto-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.2);
    border-color: rgba(0, 230, 118, 0.3);
  }

  .crypto-name {
    font-weight: 700;
    margin-bottom: 10px;
    color: white;
  }

  .crypto-price {
    font-size: 1.5rem;
    font-weight: 700;
    margin-bottom: 5px;
  }

  .positive {
    color: var(--accent);
  }

  .negative {
    color: #ff5252;
  }

  .crypto-change {
    font-size: 0.9rem;
    opacity: 0.8;
  }

  /* News feed styles */
  .news-item {
    margin-bottom: 30px;
    padding-bottom: 20px;
    border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  }

  .news-item:last-child {
    border-bottom: none;
  }

  .news-date {
    font-size: 0.9rem;
    color: rgba(255, 255, 255, 0.6);
    margin-bottom: 5px;
  }

  /* AR/VR section */
  .ar-vr-container {
    position: relative;
    height: 500px;
    margin: 3rem 0;
    border-radius: 12px;
    overflow: hidden;
    background: linear-gradient(135deg, #000033, #0a0f1f);
  }

  .ar-vr-overlay {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    padding: 40px;
    background: rgba(0, 0, 51, 0.5);
    z-index: 1;
  }

  .ar-vr-element {
    position: absolute;
    width: 100px;
    height: 100px;
    background: rgba(0, 230, 118, 0.2);
    border: 2px solid var(--accent);
    border-radius: 50%;
    animation: float 6s infinite ease-in-out;
  }

  .ar-vr-element:nth-child(1) {
    top: 20%;
    left: 15%;
    animation-delay: 0s;
  }

  .ar-vr-element:nth-child(2) {
    top: 60%;
    left: 25%;
    animation-delay: 1s;
  }

  .ar-vr-element:nth-child(3) {
    top: 30%;
    right: 20%;
    animation-delay: 2s;
  }

  .ar-vr-element:nth-child(4) {
    bottom: 20%;
    right: 15%;
    animation-delay: 3s;
  }

  @keyframes float {
    0%, 100% {
      transform: translateY(0) rotate(0deg);
    }
    50% {
      transform: translateY(-20px) rotate(10deg);
    }
  }

  /* Tooltip */
  .tooltip {
    position: relative;
    display: inline-block;
    border-bottom: 1px dotted var(--text);
    cursor: help;
  }

  .tooltip .tooltiptext {
    visibility: hidden;
    width: 200px;
    background-color: var(--dark);
    color: var(--text);
    text-align: center;
    border-radius: 6px;
    padding: 10px;
    position: absolute;
    z-index: 1;
    bottom: 125%;
    left: 50%;
    transform: translateX(-50%);
    opacity: 0;
    transition: opacity 0.3s;
    border: 1px solid rgba(255, 255, 255, 0.1);
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
  }

  .tooltip:hover .tooltiptext {
    visibility: visible;
    opacity: 1;
  }

  /* Notification */
  .notification {
    position: fixed;
    bottom: 20px;
    right: 20px;
    background: var(--primary);
    color: white;
    padding: 15px 25px;
    border-radius: 8px;
    box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
    transform: translateY(100px);
    opacity: 0;
    transition: all 0.3s ease;
    z-index: 1000;
  }

  .notification.show {
    transform: translateY(0);
    opacity: 1;
  }

  /* Responsive adjustments */
  @media (max-width: 768px) {
    .ar-vr-container {
      height: 400px;
    }
  }

  @media (max-width: 576px) {
    .ar-vr-container {
      height: 300px;
    }
  }