.container-html-encoder-decoder {
  background-color: #f9f9f9;
  color: #222;
  font-family: "Segoe UI", sans-serif;
  margin: 0;
  padding: 40px;
  /* message box */
}
.container-html-encoder-decoder .container {
  max-width: 100%;
  padding: 0 20px;
  box-sizing: border-box;
}
.container-html-encoder-decoder .card {
  width: 100%;
  background: #ffffff;
  padding: 30px;
  border-radius: 12px;
  box-shadow: 0 0 12px rgba(0, 0, 0, 0.05);
  box-sizing: border-box;
}
.container-html-encoder-decoder h1 {
  font-size: 26px;
  color: #333;
  margin-bottom: 5px;
}
.container-html-encoder-decoder .subtitle {
  font-size: 14px;
  color: #777;
  margin-bottom: 20px;
}
.container-html-encoder-decoder .button-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 20px;
}
.container-html-encoder-decoder .btn-primary,
.container-html-encoder-decoder .btn-secondary {
  color: white;
  padding: 10px 20px;
  border: none;
  font-weight: bold;
  border-radius: 6px;
  cursor: pointer;
  transition: 0.2s ease;
}
.container-html-encoder-decoder .btn-primary {
  background-color: #de9406;
  color: #fff;
}
.container-html-encoder-decoder .btn-primary:hover {
  background-color: #86621d;
}
.container-html-encoder-decoder .btn-secondary {
  background-color: #DE9406;
  color: #fff;
}
.container-html-encoder-decoder .btn-secondary:hover {
  background-color: #86621d;
}
.container-html-encoder-decoder .row {
  display: flex;
  gap: 20px;
  justify-content: space-between;
  flex-wrap: wrap;
  margin-top: 20px;
}
.container-html-encoder-decoder .half {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-width: 45%;
}
.container-html-encoder-decoder textarea {
  width: 100%;
  padding: 14px;
  border-radius: 6px;
  border: 1px solid #ccc;
  background-color: #fff;
  color: #333;
  font-family: monospace;
  font-size: 14px;
  resize: vertical;
  margin-bottom: 12px;
  box-sizing: border-box;
}
.container-html-encoder-decoder .btn-align {
  display: flex;
  justify-content: flex-end;
  margin-top: 10px;
  gap: 20px;
}
.container-html-encoder-decoder .btn-fixed {
  width: 130px;
  padding: 10px 0;
  text-align: center;
}
.container-html-encoder-decoder .msg-box {
  padding: 12px 10px;
  border-radius: 6px;
  font-size: 14px;
  font-weight: 500;
  display: none;
}
.container-html-encoder-decoder .msg-success {
  background: #d1fae5;
  color: #065f46;
  border-left: 5px solid #10b981;
}