body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  background-color: #ffffff;
  color: #333333;
  margin: 0;
  padding: 0;
}
.container_verify {
  max-width: 600px;
  margin: 80px auto;
  padding: 20px;
  background-color: #f9f9f9;
  border-radius: 8px;
  box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}
h2 {
  color: #004080;
  text-align: center;
}
form {
  display: flex;
  flex-direction: column;
  gap: 15px;
}
input, button {
  padding: 10px;
  font-size: 1em;
  border: 1px solid #ccc;
  border-radius: 4px;
}
button {
  background-color: #004080;
  color: #ffffff;
  cursor: pointer;
}
button:hover {
  background-color: #003060;
}
#errorBox {
  margin-top: 20px;
}
#resultBox {
  margin-top: 20px;
  padding: 15px;
  background: #e6f2ff;
  border-left: 5px solid #004080;
}
.error {
  color: red;
}

.container_verify_row {
  display: flex;
  gap: 40px;
  max-width: 900px;
  margin: 80px auto;
  padding: 30px 20px;
  background-color: #f9f9f9;
  border-radius: 8px;
  box-shadow: 0 2px 8px rgba(0,0,0,0.1);
}

.verify_left {
  flex: 1 1 340px;
  min-width: 0;
}

.verify_right {
  flex: 1 1 260px;
  min-width: 0;
  background: #e6f2ff;
  border-left: 5px solid #004080;
  padding: 24px 20px;
  border-radius: 6px;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.verify_right h3 {
  color: #004080;
  margin-top: 0;
}

.verify_right ul {
  margin: 12px 0 0 18px;
  padding: 0;
  font-size: 1em;
}

/* Tablet (≤900px): Stack columns, adjust padding/gap */
@media (max-width: 900px) {
  .container_verify_row {
    flex-direction: column;
    gap: 24px;
    max-width: 98%;
    padding: 18px 6px;
    margin: 40px auto;
  }
  .verify_left,
  .verify_right {
    padding: 0 6px;
    max-width: 100%;
  }
  .verify_right {
    border-left: none;
    border-top: 5px solid #004080;
    border-radius: 0 0 6px 6px;
    padding: 18px 10px;
  }
}

/* Mobile (≤480px): Reduce padding, font size, remove box-shadow */
@media (max-width: 480px) {
  .container_verify_row {
    margin: 12px 16px;
    padding: 4px 16px;
    border-radius: 0;
    box-shadow: none;
  }
  .verify_left,
  .verify_right {
    padding: 6px 2px;
    max-width: 100%;
  }
  .verify_right {
    padding: 10px 16px;
    font-size: 0.97em;
  }
  .container_verify {
    max-width: 100%;
    margin: 12px 0;
    padding: 8px 2px;
    border-radius: 0;
    box-shadow: none;
  }
  h2 {
    font-size: 1.1rem;
  }
  label, input, button {
    font-size: 1em;
  }
  input, button {
    padding: 8px 6px;
  }
  #resultBox, #errorBox {
    font-size: 0.95rem;
    padding: 8px 4px;
  }
  form {
    gap: 8px;
  }
}