:root {
      --primary: #0a2b6c;      
      --secondary: #1e90ff;   
      --accent: #ffb300;       
      --background: #f6faff;  
      --text-main: #0a2b6c;
      --text-light: #ffffff;
      --shadow: 0 4px 12px rgba(10, 43, 108, 0.12);
      --border: #e3eaf6;
    }

    body {
      margin: 0;
      font-family: 'Poppins', sans-serif;
      background: var(--background);
      color: var(--text-main);
      line-height: 1.6;
    }
    header {
      display: flex;
      justify-content: space-between;
      align-items: center;
      padding: 18px 30px;
      background: linear-gradient(90deg, var(--primary), var(--secondary));
      box-shadow: var(--shadow);
      color: var(--text-light);
      position: sticky;
      top: 0;
      z-index: 1000;
    }
    .logo {
      font-weight: 700;
      font-size: 28px;
      letter-spacing: 2px;
      cursor: pointer;
      user-select: none;
      text-shadow: 0 0 6px rgba(255,255,255,0.7);
      display: flex;
      align-items: center;
    }
    .logo img {
      height: 38px;
      width: auto;
      display: block;
    }
    nav {
      display: flex;
      flex-direction: row;
      gap: 0;
    }
    nav button {
      margin-left: 16px;
      padding: 10px 18px;
      border: none;
      background: var(--background);
      color: var(--primary);
      font-weight: 600;
      border-radius: 30px;
      cursor: pointer;
      transition: background 0.3s, color 0.3s;
      font-size: 15px;
      box-shadow: 0 2px 5px rgba(10, 43, 108, 0.10);
    }
    nav button:hover {
      background: var(--secondary);
      color: var(--text-light);
      box-shadow: 0 4px 12px rgba(30, 144, 255, 0.18);
    }
    /* Hamburger menu styles */
    .nav-toggle {
      display: none;
      background: none;
      border: none;
      font-size: 2rem;
      color: var(--text-light);
      cursor: pointer;
      margin-left: 18px;
      z-index: 1100;
    }
    @media (max-width: 700px) {
      header {
        flex-direction: row;
        align-items: center;
        padding: 12px 8px;
        gap: 0;
      }
      .logo {
        justify-content: flex-start;
        margin-bottom: 0;
      }
      .nav-toggle {
        display: block;
      }
      nav {
        position: fixed;
        top: 0;
        right: 0;
        height: 100vh;
        width: 220px;
        background: linear-gradient(180deg, var(--primary), var(--secondary));
        flex-direction: column;
        align-items: flex-start;
        gap: 0;
        padding: 70px 18px 18px 18px;
        box-shadow: -2px 0 16px rgba(10,43,108,0.10);
        transform: translateX(100%);
        transition: transform 0.3s cubic-bezier(.4,2,.6,1);
        z-index: 1050;
      }
      nav.open {
        transform: translateX(0);
      }
      nav button {
        margin: 0 0 18px 0;
        width: 100%;
        font-size: 16px;
      }
      /* Overlay for nav */
      .nav-overlay {
        display: none;
        position: fixed;
        top: 0; left: 0; right: 0; bottom: 0;
        background: rgba(10,43,108,0.18);
        z-index: 1040;
      }
      .nav-overlay.active {
        display: block;
      }
    }
    @media (max-width: 480px) {
      nav {
        width: 98vw;
        padding: 60px 8vw 18px 8vw;
      }
      nav button {
        font-size: 15px;
      }
    }
    a {
        text-decoration: none;
        color: #b21717;
    }
    main {
      max-width: 700px;
      margin: 60px auto 40px;
      padding: 0 20px;
      text-align: center;
    }
    h1 {
      font-size: 38px;
      font-weight: 700;
      margin-bottom: 12px;
      color: var(--primary);
      text-shadow: 1px 1px 4px rgba(10,43,108,0.10);
    }
    p {
      font-size: 18px;
      margin-bottom: 40px;
      color: var(--primary);
      max-width: 550px;
      margin-left: auto;
      margin-right: auto;
    }
    .download-section {
        display: flex;
        flex-direction: column;
        align-items: center;
        gap: 24px;
        flex-wrap: nowrap;
        justify-content: flex-start;
        border: 2.5px dashed var(--secondary);
        border-radius: 32px;
        padding: 32px 0 28px 0;
        background: #fafdff;
        box-shadow: 0 4px 18px rgba(30,144,255,0.06);
        margin: 36px 0 28px 0;
    }
    .download-btn {
      background: var(--text-light);
      border-radius: 14px;
      box-shadow: var(--shadow);
      padding: 18px 25px;
      width: 100%;
      max-width: 320px;
      text-decoration: none;
      color: var(--primary);
      font-weight: 600;
      font-size: 16px;
      display: flex;
      flex-direction: column;
      align-items: center;
      transition: transform 0.3s ease, box-shadow 0.3s ease, color 0.3s;
      user-select: none;
      border: 1px solid var(--border);
    }
    .download-btn:hover {
      transform: translateY(-6px);
      box-shadow: 0 10px 25px rgba(30, 144, 255, 0.18);
      color: var(--secondary);
      border-color: var(--secondary);
    }
    .download-btn img {
      width: 48px;
      margin-bottom: 10px;
      filter: drop-shadow(0 1px 1px rgba(10,43,108,0.08));
    }
    .product-info {
      margin: 36px auto 32px;
      background: var(--text-light);
      border-radius: 22px;
      box-shadow: 0 6px 32px rgba(10,43,108,0.10), 0 1.5px 6px rgba(30,144,255,0.07);
      padding: 38px 36px 30px;
      max-width: 520px;
      border: 2px solid var(--secondary);
      display: flex;
      flex-direction: column;
      align-items: center;
      position: relative;
      z-index: 2;
    }
    .product-name {
      font-size: 2.2rem;
      font-weight: 800;
      color: var(--primary);
      margin-bottom: 10px;
      letter-spacing: 1.2px;
      text-shadow: 0 2px 8px rgba(30,144,255,0.07);
      text-align: center;
    }
    .seller {
      font-size: 1.13rem;
      color: var(--secondary);
      margin-bottom: 22px;
      font-weight: 600;
      letter-spacing: 0.5px;
      text-align: center;
    }
    .description {
      font-size: 1.08rem;
      color: var(--primary);
      margin-bottom: 28px;
      text-align: center;
      line-height: 1.6;
      max-width: 440px;
    }
    .features-title {
      font-size: 1.13rem;
      font-weight: 700;
      color: var(--primary);
      margin-bottom: 12px;
      margin-top: 10px;
      letter-spacing: 0.5px;
      text-align: center;
      width: 100%;
    }
    .features-table {
      width: 100%;
      max-width: 440px;
      margin: 0 auto 10px auto;
      border-collapse: collapse;
      background: none;
      font-size: 1rem;
    }
    .features-table tr {
      background: #fff;
      transition: background 0.18s;
    }
    .features-table tr:hover {
      background: #f0f6ff;
    }
    .features-table td {
      border-bottom: 1px solid #e3eaf6;
      padding: 14px 10px;
      text-align: left;
    }
    .features-table tr:last-child td {
      border-bottom: none;
    }
    .feature-name {
      display: block;
      font-weight: 700;
      color: var(--primary);
      margin-bottom: 4px;
      font-size: 1.07em;
      letter-spacing: 0.1px;
    }
    .feature-desc {
      font-size: 0.97em;
      color: var(--text-main);
      font-weight: 400;
      line-height: 1.5;
      margin-top: 1px;
    }
    footer {
        background: var(--primary);
        color: var(--text-light);
        text-align: center;
        padding: 22px 10px 18px 10px;
        font-size: 1.05em;
        letter-spacing: 0.5px;
        border-top: 2px solid var(--secondary);
        box-shadow: 0 -2px 12px rgba(10,43,108,0.07);
        margin-top: 40px;
    }
    @media (max-width: 700px) {
      .product-info {
        padding: 22px 10px 18px;
        max-width: 98vw;
      }
      .features-table {
        max-width: 98vw;
        font-size: 0.98rem;
      }
      .features-table td {
        padding: 10px 6px;
      }
    }
    @media (max-width: 480px) {
      header {
        flex-direction: column;
        align-items: stretch;
        padding: 12px 8px;
        gap: 10px;
      }
      .logo {
        justify-content: center;
        margin-bottom: 6px;
      }
      nav {
        flex-direction: column;
        align-items: stretch;
        gap: 8px;
      }
      nav button {
        margin-left: 0;
        margin-bottom: 0;
        width: 100%;
        font-size: 15px;
      }
      main {
        margin: 40px 10px 30px;
      }
      .download-section {
        gap: 16px;
      }
      .download-btn {
        width: 100%;
        max-width: 260px;
        padding: 15px 20px;
        font-size: 14px;
      }
      h1 {
        font-size: 28px;
      }
      p {
        font-size: 16px;
      }
      .product-info {
        padding: 14px 4vw 10px;
        margin: 22px auto 18px;
        border-radius: 14px;
      }
      .product-name {
        font-size: 1.25rem;
      }
      .features-table {
        font-size: 0.98rem;
        border-spacing: 0 6px;
      }
      .features-table td {
        padding: 8px 4px;
      }
      .feature-name {
        font-size: 1em;
      }
      .feature-desc {
        font-size: 0.92em;
      }
    }