:root {
      --accent: #2563eb; /* bold blue */
      --accent-hover: #1d4ed8;
      --background: #0f172a;
      --surface: #0f172a;
      --text: #ffffff; /* dark slate */
      --text-muted: #ffffff; /* cool gray */
      --border: #2563eb;
      --shadow-light: rgba(37, 99, 235, 0.15);
    }

    /* Reset and body */
    body {
      margin: 0;
      font-family: 'Poppins', sans-serif;
      background-color: var(--background);
      color: var(--text);
      line-height: 1.6;
      font-weight: 400;
      -webkit-font-smoothing: antialiased;
      -moz-osx-font-smoothing: grayscale;
    }

    .logo h1 {
      color: var(--accent);
      font-size: 2.4rem;
      font-weight: 700;
      margin: 0;
      letter-spacing: 0.05em;
    }

    nav {
      display: flex;
      gap: 2.5rem;
      font-size: 1.1rem;
    }

    nav a {
      position: relative;
      padding-bottom: 4px;
      color: var(--accent);
      font-weight: 600;
      text-decoration: none;
      transition: color 0.25s ease;
    }

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

    nav a:hover,
    nav a.active {
      color: var(--accent-hover);
    }

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

    /* Main content */
    main {
      max-width: 900px;
      margin: 3rem auto 5rem auto;
      padding: 0 1.5rem;
      color: var(--text-muted);
    }

    main h2 {
      color: var(--accent);
      font-weight: 700;
      font-size: 2rem;
      margin-bottom: 2rem;
      text-align: center;
    }

    .testimonial-cards {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
      gap: 2rem;
      margin-bottom: 3rem;
    }

    .testimonial-card {
      background: rgba(37, 99, 235, 0.05);
      padding: 1.8rem 2rem;
      border-radius: 1rem;
      box-shadow: 0 0 15px rgba(37, 99, 235, 0.15);
      font-weight: 500;
      font-size: 1.1rem;
      color: #ffffff;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
      transition: transform 0.3s ease, box-shadow 0.3s ease;
      cursor: default;
    }

    .testimonial-card:hover {
      transform: translateY(-6px);
      box-shadow: 0 10px 25px rgba(37, 99, 235, 0.3);
    }

    .testimonial-card footer {
      margin-top: 1.4rem;
      font-weight: 700;
      color: var(--accent);
      font-size: 1rem;
      text-align: right;
    }

    .testimonial-cta {
      text-align: center;
      font-size: 1.2rem;
      color: var(--text-muted);
    }

    .testimonial-cta p {
      margin-bottom: 1.6rem;
    }

    .btn-primary {
      background-color: var(--accent);
      color: #fff;
      padding: 0.75rem 2rem;
      border-radius: 9999px;
      font-weight: 600;
      font-size: 1.1rem;
      border: none;
      cursor: pointer;
      transition: background-color 0.3s ease;
      text-decoration: none;
      display: inline-block;
      text-align: center;
      user-select: none;
    }

    .btn-primary:hover {
      background-color: var(--accent-hover);
    }

    .header-inner {
      width: 100%;
      padding: 1rem 2rem;
      display: flex;
      justify-content: space-between;
      align-items: center;
    }


    header {
      background: var(--surface);
      border-bottom: 2px solid var(--border);
      padding: 1.5rem 3rem;
      display: flex;
      justify-content: space-between;
      align-items: center;
      position: sticky;
      top: 0;
      z-index: 100;
      box-shadow: 0 2px 10px var(--shadow-light);
    }


    footer {
      background: var(--surface);
      border-top: 2px solid var(--border);
      padding: 2rem 1.5rem;
      text-align: center;
      color: var(--text-muted);
      font-size: 0.95rem;
      font-weight: 500;
      letter-spacing: 0.02em;
      user-select: none;
    }