* {
  margin: 0;
  padding: 0;
}

body {
  background-color: #f1f2f3;
}

.container {
  box-sizing: border-box;
  width: 100%;
  max-width: 1600px;
  min-width: 1240px;
  margin: 25px auto;
  color: #333;
  display: flex;
  flex-direction: column;
}

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

/* 头部样式 */
header {
  position: relative;
  margin-bottom: 20px;
  text-align: center;
}

header h1 {
  font-size: 32px;
  margin-bottom: 5px;
}

header p {
  font-size: 16px;
  line-height: 1.6;
}

.features {
  display: flex;
  justify-content: center;
  gap: 15px;
  margin-top: 8px;
  flex-wrap: wrap;
}

.feature-tag {
  background: linear-gradient(135deg, #d8b4ff 0%, #83b1ff 100%);
  color: white;
  padding: 5px 12px;
  border-radius: 20px;
  font-size: 0.9rem;
  display: flex;
  align-items: center;
  gap: 5px;
}

.converter-container {
  display: flex;
  gap: 20px;
  margin-bottom: 25px;
}

.editor-panel {
  flex: 1;
  background: white;
  border-radius: 10px;
  box-shadow: 0 5px 15px rgba(0, 0, 0, 0.08);
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

.panel-header {
  background: #f8f9fa;
  padding: 12px 20px;
  border-bottom: 1px solid #e9ecef;
  display: flex;
  align-items: center;
  gap: 8px;
  font-weight: 600;
}

textarea {
  flex: 1;
  padding: 15px;
  border: none;
  resize: none;
  font-size: 15px;
  line-height: 1.5;
  min-height: 500px;
  outline: none;
  background: #fcfcff;
}

#output {
  background: #f8f9fa;
  color: #495057;
}

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

.btn {
  padding: 14px 54px;
  border: none;
  border-radius: 8px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 8px;
  transition: all 0.3s ease;
  box-shadow: 0 4px 6px rgba(50, 50, 93, 0.11), 0 1px 3px rgba(0, 0, 0, 0.08);
}

.btn-primary {
  background: linear-gradient(to right, #4776E6, #8E54E9);
  color: white;
}

.btn-secondary {
  background: #3a86ff;
  color: white;
}

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

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

.btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 7px 14px rgba(50, 50, 93, 0.1), 0 3px 6px rgba(0, 0, 0, 0.08);
}

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

.options {
  background: white;
  border-radius: 10px;
  padding: 20px;
  box-shadow: 0 5px 15px rgba(0, 0, 0, 0.08);
  margin-bottom: 2rem;
}

.option-title {
  font-size: 1.1rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 10px;
}

.option-group {
  display: flex;
  gap: 20px;
  flex-wrap: wrap;
}

.option-item {
  display: flex;
  align-items: center;
  font-size: 1.1rem;
  gap: 8px;
}

.notice {
  position: fixed;
  bottom: 30px;
  left: 50%;
  transform: translateX(-50%);
  background: rgba(0, 0, 0, 0.8);
  color: white;
  padding: 15px 30px;
  border-radius: 50px;
  font-size: 1rem;
  display: flex;
  align-items: center;
  gap: 10px;
  z-index: 1000;
  opacity: 0;
  transition: opacity 0.3s ease;
  pointer-events: none;
}

.notice.show {
  opacity: 1;
}

footer {
  background: #2c3e50;
  color: #ecf0f1;
  padding: 20px;
  border-radius: 12px;
}

.footer-content {
  margin: 10px auto;
  padding: 0 20px;
  display: flex;
  flex-wrap: wrap;
  gap: 40px;
}

.footer-section {
  flex: 1;
  min-width: 250px;
}

.footer-title {
  font-size: 1.3rem;
  margin-bottom: 1.2rem;
  display: flex;
  align-items: center;
  gap: 10px;
}

.footer-links {
  list-style: none;
}

.footer-links li {
  margin-top: 10px;
}


.copyright {
  text-align: center;
  padding-top: 20px;
  margin-top: 20px;
  border-top: 1px solid #34495e;
  color: #7f8c8d;
  font-size: 0.9rem;
}