@import url('https://fonts.googleapis.com/css2?family=Poppins:wght@300;400;600;700&display=swap');

    :root {
      --primary-color: #0a4a7d; /* Deep Blue */
      --secondary-color: #007bff; /* Bright Blue */
      --accent-color: #f0f8ff; /* Alice Blue */
      --text-color: #333;
      --light-gray: #f4f4f4;
      --white: #fff;
      --header-height: 70px;
      --transition-speed: 0.3s ease;
    }

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

    html {
      scroll-behavior: smooth;
    }

    body {
      font-family: 'Poppins', sans-serif;
      line-height: 1.6;
      color: var(--text-color);
      background-color: var(--white);
      padding-top: var(--header-height); /* Prevent content overlap */
      overflow-x: hidden; /* Prevent horizontal scroll */
    }

    .container {
      max-width: 1100px;
      margin: 0 auto;
      padding: 0 20px;
    }

    /* Header & Navigation */
    .header {
      background-color: var(--white);
      box-shadow: 0 2px 5px rgba(0, 0, 0, 0.1);
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      z-index: 1000;
      height: var(--header-height);
      transition: background-color var(--transition-speed);
    }

    .header-content {
      display: flex;
      justify-content: space-between;
      align-items: center;
      height: 100%;
    }

    .logo {
      font-size: 1.5rem;
      font-weight: 700;
      color: var(--primary-color);
      text-decoration: none;
      transition: color var(--transition-speed);
    }
    .logo:hover {
      color: var(--secondary-color);
    }

    .main-nav {
      display: flex;
      align-items: center;
    }

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

    .nav-links li {
      margin-left: 25px;
    }

    .nav-link {
      text-decoration: none;
      color: var(--primary-color);
      font-weight: 600;
      padding: 5px 0;
      position: relative;
      transition: color var(--transition-speed);
    }

    .nav-link::after {
      content: '';
      position: absolute;
      bottom: -2px;
      left: 0;
      width: 0;
      height: 2px;
      background-color: var(--secondary-color);
      transition: width var(--transition-speed);
    }

    .nav-link:hover,
    .nav-link.active {
      color: var(--secondary-color);
    }

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

    .nav-toggle {
      display: none; /* Hidden by default */
      background: none;
      border: none;
      cursor: pointer;
      padding: 10px;
    }

    .hamburger {
      display: block;
      width: 25px;
      height: 3px;
      background-color: var(--primary-color);
      position: relative;
      transition: background-color 0s 0.1s linear; /* Delay disappearance */
    }

    .hamburger::before,
    .hamburger::after {
      content: '';
      position: absolute;
      left: 0;
      width: 100%;
      height: 3px;
      background-color: var(--primary-color);
      transition: transform var(--transition-speed), top var(--transition-speed) 0.1s linear;
    }

    .hamburger::before {
      top: -8px;
    }

    .hamburger::after {
      top: 8px;
    }

    /* Mobile Nav Toggle Styles */
    .nav-open .nav-toggle .hamburger {
        background-color: transparent; /* Hide middle line */
    }
    .nav-open .nav-toggle .hamburger::before {
        transform: rotate(45deg);
        top: 0;
    }
    .nav-open .nav-toggle .hamburger::after {
        transform: rotate(-45deg);
        top: 0;
    }


    /* Main Content & Sections */
    main {
      min-height: calc(100vh - var(--header-height) - 50px); /* Adjust footer height */
    }

    .tab-content {
      display: none; /* Hide tabs by default */
      opacity: 0;
      animation: fadeIn 0.6s forwards;
    }

    .tab-content.active {
      display: block;
    }

    @keyframes fadeIn {
      from { opacity: 0; transform: translateY(10px); }
      to { opacity: 1; transform: translateY(0); }
    }

    .section-padding {
      padding: 60px 0;
    }

    h1, h2, h3 {
      color: var(--primary-color);
      margin-bottom: 1rem;
    }

    h1 { font-size: 2.8rem; font-weight: 700; }
    h2 { font-size: 2.2rem; font-weight: 600; }
    h3 { font-size: 1.5rem; font-weight: 600; }

    p {
      margin-bottom: 1rem;
    }

    ul {
      list-style: disc;
      margin-left: 20px;
      margin-bottom: 1rem;
    }

    /* Hero Section */
    .hero {
      background: linear-gradient(rgba(10, 74, 125, 0.8), rgba(10, 74, 125, 0.8)), url('https://images.unsplash.com/photo-1519389950473-47ba0277781c?ixlib=rb-1.2.1&auto=format&fit=crop&w=1350&q=80') no-repeat center center/cover;
      color: var(--white);
      text-align: center;
      padding: 100px 0;
      animation: fadeIn 1s ease-out;
    }

    .hero h1 {
      color: var(--white);
      margin-bottom: 0.5rem;
    }

    .hero p {
      font-size: 1.2rem;
      margin-bottom: 1.5rem;
    }

    .cta-button {
      display: inline-block;
      background-color: var(--secondary-color);
      color: var(--white);
      padding: 12px 25px;
      border: none;
      border-radius: 5px;
      text-decoration: none;
      font-weight: 600;
      transition: background-color var(--transition-speed), transform var(--transition-speed);
      cursor: pointer;
    }

    .cta-button:hover {
      background-color: #0056b3; /* Darker blue */
      transform: translateY(-2px);
    }

    /* Services Section */
    .service-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
      gap: 30px;
      margin-top: 30px;
    }

    .service-item {
      background-color: var(--light-gray);
      padding: 30px;
      border-radius: 8px;
      text-align: center;
      transition: transform var(--transition-speed), box-shadow var(--transition-speed);
    }

    .service-item:hover {
      transform: translateY(-5px);
      box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
    }

    .service-icon {
      font-size: 2.5rem;
      color: var(--secondary-color);
      margin-bottom: 15px;
    }

    /* Marketplace Section */
    .marketplace-categories {
      display: flex;
      flex-wrap: wrap;
      gap: 20px;
      margin-top: 30px;
    }

    .category {
      flex: 1 1 200px; /* Allow wrapping */
      min-width: 180px;
    }

    .category-button {
      background-color: var(--accent-color);
      border: 1px solid #ddd;
      border-radius: 5px;
      padding: 15px;
      width: 100%;
      text-align: left;
      cursor: pointer;
      display: flex;
      align-items: center;
      gap: 10px;
      font-size: 1rem;
      font-weight: 600;
      color: var(--primary-color);
      transition: background-color var(--transition-speed);
    }

    .category-button:hover {
      background-color: #e0f0ff;
    }

    .category-icon {
      font-size: 1.5rem;
      color: var(--secondary-color);
      width: 30px; /* Fixed width for alignment */
      text-align: center;
    }

    .product-list {
      list-style: none;
      margin: 10px 0 0 0;
      padding-left: 15px;
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.5s ease-out, opacity 0.5s ease-out;
      opacity: 0;
      border-left: 3px solid var(--secondary-color);
    }

    .product-list.visible {
      max-height: 300px; /* Adjust as needed */
      opacity: 1;
    }

    .product-list li {
      padding: 5px 0;
      font-size: 0.95rem;
      display: flex;
      align-items: center;
      gap: 8px;
    }

    .product-list li i {
      color: var(--secondary-color);
      font-size: 0.8rem;
    }

    /* Contact Section */
    .contact-form {
      margin-bottom: 40px;
      max-width: 600px;
    }

    .form-group {
      margin-bottom: 20px;
    }

    .form-group label {
      display: block;
      margin-bottom: 5px;
      font-weight: 600;
      color: var(--primary-color);
    }

    .form-group input,
    .form-group textarea {
      width: 100%;
      padding: 10px;
      border: 1px solid #ccc;
      border-radius: 4px;
      font-family: inherit;
      font-size: 1rem;
    }

    .form-group textarea {
      resize: vertical;
    }

    .contact-info p {
      margin-bottom: 0.5rem;
      display: flex;
      align-items: center;
      gap: 10px;
    }

    .contact-info i {
      color: var(--secondary-color);
      width: 20px; /* Align icons */
      text-align: center;
    }

    /* Footer */
    .footer {
      background-color: var(--primary-color);
      color: var(--white);
      text-align: center;
      padding: 20px 0;
      margin-top: 40px; /* Ensure space above footer */
    }

    /* Responsiveness */
    @media (max-width: 768px) {
      h1 { font-size: 2.2rem; }
      h2 { font-size: 1.8rem; }
      h3 { font-size: 1.3rem; }

      .header-content {
        position: relative; /* Needed for absolute positioning of nav */
      }

      .nav-toggle {
        display: block; /* Show hamburger */
        z-index: 1001; /* Above nav links */
        position: relative; /* Ensure it's clickable */
      }

      .main-nav {
        position: static; /* Reset position */
      }

      .nav-links {
        position: fixed;
        top: 0;
        right: -100%; /* Start off-screen */
        width: 70%;
        max-width: 300px;
        height: 100vh;
        background-color: var(--white);
        flex-direction: column;
        padding-top: calc(var(--header-height) + 20px);
        padding-left: 20px;
        box-shadow: -2px 0 5px rgba(0, 0, 0, 0.1);
        transition: right var(--transition-speed);
        z-index: 1000;
      }

      .nav-open .nav-links {
        right: 0; /* Slide in */
      }

      .nav-links li {
        margin: 15px 0;
        margin-left: 0; /* Reset margin */
      }

      .nav-link {
        font-size: 1.1rem;
      }

      .hero {
        padding: 60px 0;
      }

      .service-grid {
        grid-template-columns: 1fr; /* Stack services */
      }

      .marketplace-categories {
        flex-direction: column; /* Stack categories */
      }
    }

    @media (max-width: 480px) {
        .container {
            padding: 0 15px;
        }
        h1 { font-size: 2rem; }
        .hero p { font-size: 1rem; }
        .cta-button { padding: 10px 20px; font-size: 0.9rem;}
    }