:root {
        --orange: #f16a48;
        --orange-dark: #d4552f;
        --orange-light: #fff2ee;
        --orange-mid: #fde8e2;
        --dark: #1c1c1e;
        --text: #2d2d2d;
        --text-light: #6b6b6b;
        --white: #ffffff;
        --offwhite: #f9f7f5;
        --border: #e8e8e8;
      }

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

      body {
        font-family: 'Noto Sans TC', sans-serif;
        color: var(--text);
        background: var(--offwhite);
        min-height: 100vh;
        display: flex;
        flex-direction: column;
      }

      main {
        flex: 1;
        display: flex;
        align-items: center;
        justify-content: center;
        padding: 2rem 1rem;
      }

      /* Progress Bar */
      .steps-wrapper {
        display: flex;
        justify-content: space-between;
        margin-bottom: 2rem;
        position: relative;
      }

      .steps-wrapper::before {
        content: '';
        position: absolute;
        top: 15px;
        left: 0;
        width: 100%;
        height: 2px;
        background: #eee;
        z-index: 1;
      }

      .step-dot {
        width: 30px;
        height: 30px;
        background: white;
        border: 2px solid #eee;
        border-radius: 50%;
        z-index: 2;
        display: flex;
        align-items: center;
        justify-content: center;
        font-size: 12px;
        font-weight: bold;
        color: #ccc;
        transition: all 0.3s;
      }

      .step-dot.active {
        border-color: var(--orange);
        color: var(--orange);
        box-shadow: 0 0 10px rgba(241, 106, 72, 0.2);
      }

      .step-dot.done {
        background: var(--orange);
        border-color: var(--orange);
        color: white;
      }

      .form-card {
        background: white;
        border-radius: 20px;
        padding: 40px;
        width: 100%;
        max-width: 550px;
        box-shadow: 0 8px 48px rgba(0, 0, 0, 0.07);
        border: 1px solid var(--border);
      }

      .step-content {
        display: none;
        animation: fadeIn .4s ease;
      }

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

      @keyframes
      fadeIn {
        from {
          opacity: 0;
        }

        to {
          opacity: 1;
        }
      }

      .form-title {
        font-family: 'Noto Serif TC', serif;
        font-size: 1.5rem;
        font-weight: 700;
        margin-bottom: 1.5rem;
        text-align: center;
      }

      .form-group {
        margin-bottom: 1.2rem;
      }

      label {
        display: block;
        font-size: 0.85rem;
        font-weight: 500;
        margin-bottom: 8px;
      }

      input[type="text"],
      input[type="email"],
      input[type="tel"],
      input[type="number"] {
        width: 100%;
        padding: 13px;
        border: 1.5px solid var(--border);
        border-radius: 10px;
        font-size: 0.95rem;
        outline: none;
        background: var(--offwhite);
      }

      input:focus {
        border-color: var(--orange);
        background: white;
      }

      .phone-row {
        display: grid;
        grid-template-columns: 100px 1fr;
        gap: 10px;
      }

      select {
        width: 100%;
        padding: 13px;
        border: 1.5px solid var(--border);
        border-radius: 10px;
        background: var(--offwhite);
        appearance: none;
      }

      /* PDF Preview */
      .pdf-viewer {
        width: 100%;
        height: 350px;
        border: 1px solid var(--border);
        border-radius: 10px;
        margin-bottom: 1.5rem;
        background: #eee;
      }

      .btn-submit {
        width: 100%;
        padding: 15px;
        background: var(--orange);
        color: white;
        border: none;
        border-radius: 10px;
        font-size: 1rem;
        font-weight: 600;
        cursor: pointer;
        transition: 0.2s;
        margin-top: 10px;
      }

      .btn-submit:hover {
        background: var(--orange-dark);
        transform: translateY(-1px);
      }

      .btn-submit:disabled {
        background: #ccc;
        cursor: not-allowed;
      }

      footer {
        text-align: center;
        padding: 20px;
        font-size: 0.75rem;
        color: var(--text-light);
      }