*{
  margin: 0;
  padding: 0;
}

body {
  background-color: #f1f2f3;
}

.container {
  box-sizing: border-box;
  width: 100%;
  max-width: 1560px;
  min-width: 1240px;
  margin: 25px auto;
  position: relative;
  color: #333;
}

.container * {
  box-sizing: border-box;
}

header {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  margin-bottom: 25px;
  width: 100%;
}

header h1 {
  font-size: 2.2rem;
  margin-bottom: 10px;
  position: relative;
  display: inline-block;
}

header p {
  opacity: 0.9;
  font-size: 1.1rem;
}

.converter-container {
  background-color: white;
  border-radius: 12px;
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.08);
  padding: 20px;
  margin-bottom: 25px;
}

.input-group {
  margin-bottom: 20px;
}

label {
  display: block;
  margin-bottom: 10px;
  font-weight: 600;
  color: #2c3e50;
  font-size: 1.1rem;
}

textarea {
  width: 100%;
  min-height: 180px;
  padding: 15px;
  border: 2px solid #e1e5e8;
  border-radius: 8px;
  font-size: 1rem;
  line-height: 1.5;
  resize: vertical;
  transition: border-color 0.3s;
}

textarea:focus {
  outline: none;
  border-color: #3498db;
}

.btn-group {
  display: flex;
  gap: 15px;
  flex-wrap: wrap;
  margin-bottom: 25px;
}

.btn {
  padding: 12px 30px;
  border: none;
  border-radius: 8px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s;
  display: flex;
  align-items: center;
  gap: 8px;
}

.btn-encode {
  background-color: #3498db;
  color: white;
}

.btn-encode:hover {
  background-color: #2980b9;
}

.btn-decode {
  background-color: #2ecc71;
  color: white;
}

.btn-decode:hover {
  background-color: #27ae60;
}

.btn-copy {
  background-color: #9b59b6;
  color: white;
}

.btn-copy:hover {
  background-color: #8e44ad;
}

.btn-clear {
  background-color: #e74c3c;
  color: white;
}

.btn-clear:hover {
  background-color: #c0392b;
}

.result-title {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 15px;
  font-size: 1.1rem;
  color: #2c3e50;
  font-weight: 600;
}

.info-section {
  background-color: white;
  border-radius: 12px;
  box-shadow: 0 8px 30px rgba(0, 0, 0, 0.08);
  padding: 20px;
  margin-bottom: 25px;
}

.section-title {
  font-size: 1.4rem;
  margin-bottom: 20px;
  color: #2c3e50;
  display: flex;
  align-items: center;
  gap: 10px;
}

.info-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 25px;
}

.info-card {
  background-color: #f8f9fa;
  padding: 15px;
  border-radius: 10px;
  border-left: 4px solid #3498db;
}

.info-card h3 {
  margin-bottom: 10px;
  color: #2c3e50;
  font-size: 1.15rem;
  display: flex;
  align-items: center;
  gap: 8px;
}

.info-card p, .info-card li{
  margin-top: 10px;
}

.info-card ul{
  padding-left: 20px;
}

.info-card .example {
  font-weight: 600;
  color: #2c3e50;
}

.notice {
  position: fixed;
  bottom: 30px;
  left: 50%;
  transform: translateX(-50%);
  background-color: rgba(0, 0, 0, 0.8);
  color: white;
  padding: 15px 30px;
  border-radius: 8px;
  font-size: 1rem;
  opacity: 0;
  transition: opacity 0.3s;
  z-index: 1000;
}

.notice.show {
  opacity: 1;
}

footer {
  text-align: center;
  color: #7f8c8d;
  font-size: 0.9rem;
}