.usdt-topup-manager {
  max-width: 720px;
  margin: 40px auto;
  padding: 30px 20px;
  background: #fff;
  border-radius: 8px;
  box-shadow: 0 4px 12px rgba(0,0,0,0.05);
  font-family: "Helvetica Neue", Arial, sans-serif;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.usdt-topup-manager h3,
.usdt-topup-manager p,
.usdt-topup-manager input[readonly] {
  width: 100%;
  max-width: 500px;
  text-align: center;
  margin-left: auto;
  margin-right: auto;
  display: block;
}

.usdt-topup-manager img {
  display: block;
  margin: 16px auto 24px auto;
  max-width: 200px;
}

.usdt-topup-manager .topup-form {
  width: 100%;
  max-width: 400px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.usdt-topup-manager .form-group {
  width: 100%;
  margin: 16px 0;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.usdt-topup-manager .form-group label {
  width: 100%;
  max-width: 300px;
  margin-bottom: 8px;
  text-align: center;
}

.usdt-topup-manager .form-group input[type="number"],
.usdt-topup-manager .form-group input[type="file"] {
  width: 100%;
  max-width: 300px;
  margin-bottom: 4px;
  text-align: center;
}

.usdt-topup-manager .btn-topup {
  display: block;
  width: 200px;
  margin: 30px auto 0;
  padding: 12px 0;
  background: #20c997;
  color: #fff;
  font-size: 1rem;
  font-weight: 600;
  border: none;
  border-radius: 50px;
  cursor: pointer;
  transition: background-color .2s;
  text-align: center;
}

.usdt-topup-manager .btn-topup:hover {
  background: #17a589;
}

.custom-file-input {
    display: none !important;
}
.custom-file-label {
  display: inline-block;
  padding: 8px 18px;
  background: #20c997;
  color: #fff;
  border-radius: 4px;
  cursor: pointer;
  margin-right: 10px;
  font-size: 1em;
}
#file-name {
  color: #333;
  font-size: 0.96em;
  vertical-align: middle;
}

.usdt-topup-success, .usdt-topup-fail {
    text-align: center;
    font-size: 1.08em;
    margin: 0 auto 24px auto;
    padding: 14px 12px;
    border-radius: 8px;
    max-width: 480px;
    box-shadow: 0 2px 8px rgba(32,201,151,0.04);
}
.usdt-topup-success {
    background: #e7f9f5;
    color: #19c69b;
    border: 1px solid #b7f4e6;
    font-weight: bold;
}
.usdt-topup-fail {
    background: #fdeaea;
    color: #e74c3c;
    border: 1px solid #f9d0d0;
    font-weight: bold;
}