* {
  margin: 0;
  padding: 0;
}

body {
  background-color: #f1f2f3;
}

.container {
  box-sizing: border-box;
  width: 100%;
  max-width: 1560px;
  min-width: 1240px;
  margin: 20px auto;
  color: #333;
}

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

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

header h1 {
  font-size: 2.2rem;
  margin-bottom: 10px;
}

header p {
  font-size: 1rem;
  opacity: 0.9;
}


.main-content {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  margin-bottom: 25px;
}

.editor-container,
.output-container {
  display: flex;
  flex-direction: column;
  height: 700px;
  background: #fff;
  border-radius: 12px;
  overflow: hidden;
}

.panel-header {
  display: flex;
  align-items: center;
  padding: 10px;
  color: #2c3e50;
  font-size: 16px;
  font-weight: 600;
  border-bottom: 1px solid #ddd;
}

.panel-header span {
  margin-right: 8px;
  font-size: 1.2rem;
}

.code-area {
  flex: 1;
  border: none;
  padding: 10px;
  font-size: 15px;
  line-height: 1.5;
  resize: none;
  color: #1e1e1e;
  border: 0;
  outline: none;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
}

.controls {
  display: flex;
  justify-content: center;
  gap: 20px;
  margin-bottom: 25px;
}

.btn {
  padding: 13px 42px;
  font-size: 1rem;
  font-weight: 600;
  border: none;
  border-radius: 6px;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 8px;
  transition: all 0.3s ease;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

.btn:hover {
  transform: translateY(-1px);
  box-shadow: 0 6px 10px rgba(0, 0, 0, 0.15);
}

.btn:active {
  transform: translateY(1px);
}

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

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

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

.btn-example {
  background: #f39c12;
  color: white;
}

.features {
  background: white;
  border-radius: 12px;
  padding: 20px;
  margin-bottom: 25px;
  box-shadow: 0 5px 20px rgba(0, 0, 0, 0.05);
}

.features h2 {
  margin-bottom: 20px;
  color: #2c3e50;
  font-size: 1.4rem;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.feature-card {
  background: #f8f9fa;
  padding: 15px;
  border-radius: 8px;
  border: 1px solid #ddd;
  box-shadow: 0 3px 10px rgba(0, 0, 0, 0.05);
  transition: transform 0.3s ease;
}

.feature-card h3 {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 1rem;
  color: #3498db;
}

footer {
  text-align: center;
  font-size: 14px;
  opacity: 0.85;
}

.notice {
  position: fixed;
  bottom: 30px;
  left: 50%;
  transform: translateX(-50%) translateY(100px);
  background: rgba(0, 0, 0, 0.85);
  color: white;
  padding: 15px 30px;
  border-radius: 6px;
  font-size: 1rem;
  opacity: 0;
  transition: all 0.4s ease;
  z-index: 1000;
  box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
}

.notice.show {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}