/* Global Resets and Theme */
    * {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    }

    body {
      background-color: #f4f7f6;
      display: flex;
      justify-content: center;
      align-items: center;
      min-height: 100vh;
      color: #333333;
    }

    /* Outer Mobile Frame Simulation */
    .mobile-container {
      width: 100%;
      max-width: 410px;
      background-color: #ffffff;
      min-height: 100vh;
      display: flex;
      flex-direction: column;
      position: relative;
    }

    /* Header Section */
    .header-bar {
      display: flex;
      justify-content: space-between;
      align-items: center;
      padding: 16px 20px;
      background-color: #ffffff;
    }

    .logo-container {
      display: flex;
      flex-direction: column;
      align-items: center;
    }

    .logo-icon {
      width: 42px;
      height: 42px;
      background-color: #0c695d;
      color: #ffffff;
      border-radius: 8px;
      display: flex;
      flex-direction: column;
      justify-content: center;
      align-items: center;
      font-weight: bold;
      font-size: 11px;
      line-height: 1.2;
      text-align: center;
    }

.logo-icon img {
    border-radius: 20px;
    padding: 10px;
}

    .lang-btn {
      background-color: #111b21;
      color: #ffffff;
      border: none;
      padding: 8px 18px;
      border-radius: 20px;
      font-size: 14px;
      font-weight: 500;
      cursor: pointer;
    }

    /* Main Container & Card Form */
    .payment-card {
      background-color: #ffffff;
      border-top-left-radius: 30px;
      border-top-right-radius: 30px;
      padding: 24px 20px;
      flex-grow: 1;
      box-shadow: 0 -4px 20px rgba(0, 0, 0, 0.03);
    }

    .title-pay {
      font-size: 26px;
      font-weight: 700;
      margin-bottom: 12px;
      color: #111b21;
    }

    .description {
      font-size: 14px;
      color: #727272;
      line-height: 1.5;
      margin-bottom: 14px;
    }

    .currency-label {
      font-size: 13px;
      font-weight: 600;
      color: #4a4a4a;
      margin-bottom: 8px;
    }

    /* Input Field Block */
    .input-wrapper {
      position: relative;
      margin-bottom: 6px;
    }

    .amount-input {
      width: 100%;
      padding: 18px 16px;
      font-size: 16px;
      font-weight: 500;
      border: 1px solid #e2e8f0;
      border-radius: 12px;
      outline: none;
      color: #111b21;
      background-color: #ffffff;
      transition: border-color 0.2s;
    }

    .amount-input:focus {
      border-color: #0c695d;
    }

    .input-hint {
      font-size: 12px;
      color: #a0aec0;
      margin-bottom: 24px;
    }

    /* Preset Quick Amounts Grid */
    .section-subtitle {
      font-size: 14px;
      font-weight: 600;
      color: #111b21;
      margin-bottom: 14px;
    }

    .grid-amounts {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 10px;
      margin-bottom: 32px;
    }

    .preset-btn {
      background-color: #ffffff;
      border: 1px solid #edf2f7;
      padding: 14px 0;
      border-radius: 10px;
      font-size: 15px;
      font-weight: 600;
      color: #111b21;
      cursor: pointer;
      text-align: center;
      transition: all 0.2s ease;
      box-shadow: 0 1px 3px rgba(0, 0, 0, 0.02);
    }

    .preset-btn:hover {
      border-color: #cbd5e0;
    }

    .preset-btn.active {
      background-color: #0c695d;
      color: #ffffff;
      border-color: #0c695d;
    }

    /* Bottom Core Actions */
    .pay-submit-btn {
      width: 100%;
      background-color: #0c695d;
      color: #ffffff;
      border: none;
      padding: 16px;
      font-size: 16px;
      font-weight: 600;
      border-radius: 14px;
      cursor: pointer;
      transition: background-color 0.2s;
      margin-bottom: 16px;
    }

    .pay-submit-btn:hover {
      background-color: #095248;
    }

    .footer-secure {
      text-align: center;
      font-size: 12px;
      color: #a0aec0;
    }