* {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }
    body {
      font-family: "Microsoft YaHei", sans-serif;
      background: linear-gradient(135deg, #d9012f, #222); 
      min-height: 100vh;
      color: #333;
      display: flex;
      flex-direction: column;
    }

    .header {
      display: flex;
      align-items: center;
      justify-content: center;
      padding: 20px 0;
      color: #fff;
    }
    .header svg {
      width: 48px;
      height: auto;
      margin-right: 10px;
    }
    .header h1 {
      font-size: 24px;
      font-weight: bold;
      letter-spacing: 1px;
    }

    .container {
      width: 100%;
      max-width: 600px;
      margin: 40px auto;
      background: #fff;
      border-radius: 10px;
      box-shadow: 0 8px 20px rgba(0,0,0,0.2);
      padding: 30px 40px;
    }
    .title {
      text-align: center;
      margin-bottom: 25px;
      color: #333;
      font-size: 20px;
      font-weight: bold;
    }

    .tips {
      background: #FFFBCC;
      border-left: 4px solid #FFE564;
      padding: 10px 15px;
      margin-bottom: 20px;
      border-radius: 4px;
    }
    .tips ul {
      list-style: disc;
      margin-left: 20px;
      padding: 10px 0;
    }
    .tips li {
      margin-bottom: 5px;
    }

    .form-group {
      margin-bottom: 20px;
    }
    label {
      display: inline-block;
      margin-bottom: 8px;
      font-weight: bold;
    }
    input[type="text"],
    input[type="email"],
    input[type="number"],
    textarea {
      width: 100%;
      padding: 12px;
      border: 1px solid #ddd;
      border-radius: 6px;
      font-size: 14px;
      outline: none;
      transition: border-color 0.3s ease;
    }
    input[type="text"]:focus,
    input[type="email"]:focus,
    input[type="number"]:focus,
    textarea:focus {
      border-color: #d9012f; 
    }
    textarea {
      min-height: 80px;
      resize: vertical;
    }

    .input-group {
      display: flex;
      align-items: center;
    }
    .currency-selector {
      display: flex;
      gap: 10px;
      margin-left: 10px; 
    }
    .btn-currency {
      display: inline-block;
      padding: 10px 16px;
      font-size: 14px;
      font-weight: bold;
      border: 1px solid #d9012f;
      border-radius: 6px;
      background: #fff;
      color: #d9012f;
      cursor: pointer;
      transition: all 0.3s ease;
    }
    .btn-currency:hover {
      background: #d9012f;
      color: #fff;
    }
    .btn-currency.selected {
      background: #d9012f;
      color: #fff;
    }

    .btn-submit {
      display: inline-block;
      width: 100%;
      background: #d9012f;
      color: #fff;
      font-size: 16px;
      font-weight: bold;
      padding: 14px 0;
      border: none;
      border-radius: 6px;
      cursor: pointer;
      transition: background 0.3s ease;
    }
    .btn-submit:hover {
      background: #bd011f;
    }

    .footer {
      text-align: center;
      color: #fff;
      padding: 15px 0;
      margin-top: auto; 
      font-size: 14px;
    }

    @media (max-width: 480px) {
      .container {
        margin: 20px auto;
        padding: 20px;
      }
      .btn-currency {
        padding: 8px 10px;
      }
      .header h1 {
        font-size: 18px;
      }
    }