* {
      box-sizing: border-box;
      font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
    }
    body {
      margin: 0;
      padding: 0;
      background: #f5f6fa;
      display: flex;
      justify-content: center;
      align-items: center;
      min-height: 100vh;
    }
    .card {
      background: #ffffff;
      width: 100%;
      max-width: 360px;
      padding: 24px 22px 18px;
      border-radius: 10px;
      box-shadow: 0 4px 16px rgba(0, 0, 0, 0.08);
    }
    .card h2 {
      text-align: center;
      margin: 0 0 18px;
      font-size: 22px;
      color: #222;
    }
    label {
      display: block;
      font-size: 14px;
      margin-bottom: 4px;
      color: #333;
    }
    .input-group {
      margin-bottom: 14px;
    }
    input[type="number"] {
      width: 100%;
      padding: 10px 12px;
      border-radius: 6px;
      border: 1px solid #d0d0d0;
      font-size: 14px;
      outline: none;
      transition: border-color 0.2s, box-shadow 0.2s;
    }
    input[type="number"]:focus {
      border-color: #2563eb;
      box-shadow: 0 0 0 2px rgba(37, 99, 235, 0.15);
    }
    input[type="number"]::-webkit-inner-spin-button,
    input[type="number"]::-webkit-outer-spin-button {
      -webkit-appearance: none;
      margin: 0;
    }
    input[type="number"] {
      -moz-appearance: textfield;
    }
    .small-hint {
      font-size: 12px;
      color: #666;
      margin-top: 3px;
    }
    .otp-row {
      display: flex;
      gap: 8px;
      margin-top: 6px;
    }
    .otp-row input {
      flex: 1;
      text-align: center;
      font-size: 18px;
      padding: 8px 0;
    }
    button {
      border: none;
      border-radius: 6px;
      padding: 10px 14px;
      font-size: 14px;
      cursor: pointer;
      transition: background 0.2s, opacity 0.2s;
    }
    button:disabled {
      cursor: default;
      opacity: 0.6;
    }
    .btn-primary {
      width: 100%;
      background: #2563eb;
      color: #fff;
      font-weight: 500;
      margin-top: 8px;
    }
    .btn-outline {
      background: #f3f4f6;
      color: #2563eb;
      border: 1px solid #cbd5f5;
      width: 130px;
    }
    .otp-actions {
      display: flex;
      justify-content: space-between;
      align-items: center;
      margin-top: 8px;
    }
    .status-text {
      font-size: 12px;
      color: #16a34a;
      display: none;
    }
    .status-text.error {
      color: #dc2626;
    }
    .footer-text {
      margin-top: 14px;
      font-size: 13px;
      text-align: center;
      color: #555;
    }
    .footer-text a {
      color: #2563eb;
      text-decoration: none;
      font-weight: 500;
    }
    .footer-text a:hover {
      text-decoration: underline;
    }