.tnd-otp-box {
    max-width: 430px;
    margin: 40px auto;
    padding: 28px;
    background: #fff;
    border: 1px solid #e5e5e5;
    border-radius: 10px;
    box-shadow: 0 4px 20px rgba(0,0,0,.06);
    box-sizing: border-box;
}

.tnd-otp-box h2 {
    margin: 0 0 10px;
}

.tnd-otp-note {
    margin-bottom: 22px;
    color: #666;
}

.tnd-otp-box label {
    display: block;
    margin: 0 0 7px;
    font-weight: 600;
}

.tnd-otp-box input[type="tel"] {
    width: 100%;
    height: 48px;
    padding: 0 13px;
    margin-bottom: 14px;
    border: 1px solid #ccc;
    border-radius: 5px;
    box-sizing: border-box;
    font-size: 16px;
}

.tnd-otp-button {
    display: inline-block;
    width: 100%;
    padding: 13px 18px;
    border: 0;
    border-radius: 5px;
    background: #1e73be;
    color: #fff !important;
    text-align: center;
    text-decoration: none !important;
    cursor: pointer;
    font-size: 16px;
    box-sizing: border-box;
}

.tnd-otp-button:hover {
    opacity: .9;
}

.tnd-otp-button:disabled,
.tnd-otp-link:disabled {
    opacity: .55;
    cursor: not-allowed;
}

.tnd-otp-link {
    display: block;
    width: 100%;
    margin-top: 12px;
    padding: 8px;
    border: 0;
    background: transparent;
    color: #1e73be;
    cursor: pointer;
}

.tnd-otp-message {
    margin-top: 14px;
    font-size: 14px;
}

.tnd-otp-message.success {
    color: #16803c;
}

.tnd-otp-message.error {
    color: #c62828;
}

#tnd-countdown {
    margin-top: 8px;
    text-align: center;
    color: #777;
    font-size: 13px;
}

@media (max-width: 480px) {
    .tnd-otp-box {
        margin: 20px 12px;
        padding: 20px;
    }
}