*,
    *::before,
    *::after {
      box-sizing: border-box;
    }

    :root {
      --color-text: #1f2937;
      --color-text-muted: #6b7280;
      --color-bg: #ffffff;
      --color-bg-subtle: #f9fafb;
      --color-border: #e5e7eb;
      --color-primary: #2563eb;
      --color-primary-hover: #1d4ed8;
      --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    }

    html {
      font-size: 16px;
      -webkit-text-size-adjust: 100%;
    }

    body {
      padding-left: 10px;
      padding-right: 10px;
      margin: 0;
      font-family: var(--font-family);
      font-size: 1rem;
      line-height: 1.6;
      color: var(--color-text);
      background-color: #1a1a2e;
      -webkit-font-smoothing: antialiased;
      -moz-osx-font-smoothing: grayscale;
      min-height: 100vh;
    }

    /* Background Slideshow */
    .slideshow {
      position: fixed;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      z-index: -1;
      overflow: hidden;
    }

    .slideshow::after {
      content: '';
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      background: linear-gradient(to bottom, rgba(0, 0, 0, 0.3) 0%, rgba(0, 0, 0, 0.1) 50%, rgba(0, 0, 0, 0.4) 100%);
      z-index: 1;
    }

    .slideshow img {
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      object-fit: cover;
      opacity: 0;
      transition: opacity 1.5s ease-in-out;
    }

    .slideshow img.active {
      opacity: 1;
    }

    .container {
      position: relative;
      width: 100%;
      max-width: 720px;
      margin: 0 auto;
      padding: 2rem 1.5rem;
      background-color: rgba(255, 255, 255, 0.92);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      min-height: 100vh;
      box-shadow: 0 0 60px rgba(0, 0, 0, 0.3);
    }

    header {
      text-align: center;
      margin-bottom: 2.5rem;
    }

    .logo {
      max-width: 180px;
      width: 100%;
      height: auto;
      margin-bottom: 1.5rem;
    }

    .tagline {
      font-size: 1.25rem;
      color: var(--color-text-muted);
      margin: 0;
      font-weight: 400;
    }

    main {
      margin-bottom: 3rem;
    }

    .marketing-text {
      font-size: 1.125rem;
      line-height: 1.75;
      color: var(--color-text);
      margin-bottom: 3rem;
    }

    .marketing-text p {
      margin: 0 0 1.5rem 0;
    }

    .marketing-text p:last-child {
      margin-bottom: 0;
    }

    /* Form Styles */
    .signup-section {
      background-color: var(--color-bg-subtle);
      border: 1px solid var(--color-border);
      border-radius: 12px;
      padding: 2rem;
      margin-top: 2rem;
    }

    .signup-section h2 {
      font-size: 1.5rem;
      font-weight: 600;
      color: var(--color-text);
      margin: 0 0 0.5rem 0;
      text-align: center;
    }

    .signup-section .subtitle {
      font-size: 1rem;
      color: var(--color-text-muted);
      margin: 0 0 1.5rem 0;
      text-align: center;
    }

    .form-group {
      margin-bottom: 1.25rem;
    }

    .form-group label {
      display: block;
      font-weight: 600;
      font-size: 0.875rem;
      color: var(--color-text);
      margin-bottom: 0.5rem;
    }

    .form-group input[type="email"],
    .form-group input[type="text"] {
      width: 100%;
      padding: 0.875rem 1rem;
      font-size: 1rem;
      font-family: var(--font-family);
      border: 1px solid var(--color-border);
      border-radius: 8px;
      background-color: #fff;
      color: var(--color-text);
      transition: border-color 0.2s ease, box-shadow 0.2s ease;
    }

    .form-group input:focus {
      outline: none;
      border-color: var(--color-primary);
      box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.15);
    }

    .form-group input::placeholder {
      color: #9ca3af;
    }

    .form-group-checkbox {
      display: flex;
      align-items: flex-start;
      gap: 0.75rem;
      margin-bottom: 1.5rem;
    }

    .form-group-checkbox input[type="checkbox"] {
      width: 1.25rem;
      height: 1.25rem;
      margin: 0.125rem 0 0 0;
      flex-shrink: 0;
      accent-color: var(--color-primary);
      cursor: pointer;
    }

    .form-group-checkbox label {
      font-size: 0.875rem;
      color: var(--color-text);
      cursor: pointer;
      line-height: 1.5;
    }

    .submit-btn {
      width: 100%;
      padding: 1rem 1.5rem;
      font-size: 1rem;
      font-weight: 600;
      font-family: var(--font-family);
      color: #fff;
      background-color: var(--color-primary);
      border: none;
      border-radius: 8px;
      cursor: pointer;
      transition: background-color 0.2s ease;
    }

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

    .submit-btn:focus {
      outline: none;
      box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.3);
    }

    .privacy-note {
      display: flex;
      align-items: flex-start;
      gap: 0.75rem;
      margin-top: 1.5rem;
      padding: 1rem;
      background-color: #fff;
      border-radius: 8px;
      border: 1px solid var(--color-border);
    }

    .privacy-note svg {
      width: 32px;
      height: 32px;
      flex-shrink: 0;
    }

    .privacy-note p {
      font-size: 0.75rem;
      color: var(--color-text-muted);
      margin: 0;
      line-height: 1.5;
    }

    .privacy-note a {
      color: var(--color-primary);
    }

    .form-messages {
      margin-bottom: 1rem;
    }

    .form-message {
      display: none;
      padding: 1rem;
      border-radius: 8px;
      font-size: 0.875rem;
    }

    .form-message.error {
      background-color: #fef2f2;
      color: #991b1b;
      border: 1px solid #fecaca;
    }

    .form-message.success {
      background-color: #f0fdf4;
      color: #166534;
      border: 1px solid #bbf7d0;
    }

    .hidden-field {
      position: absolute;
      left: -9999px;
    }

    footer {
      text-align: center;
      padding: 2rem 0;
    }

    footer p {
      margin: 0;
      font-size: 0.875rem;
      color: var(--color-bg-subtle);
    }

    @media (min-width: 640px) {
      .container {
        padding: 3rem 2rem;
      }

      .logo {
        max-width: 220px;
      }

      .tagline {
        font-size: 1.5rem;
      }

      .marketing-text {
        font-size: 1.25rem;
      }

      .signup-section {
        padding: 2.5rem;
      }

      .signup-section h2 {
        font-size: 1.75rem;
      }
    }