* {
  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;
}

.main-content {
  display: flex;
  gap: 20px;
  margin-bottom: 25px;
}

.panel {
  flex: 1;
  background: white;
  border-radius: 12px;
  box-shadow: 0 5px 20px rgba(0, 0, 0, 0.08);
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

.panel-header {
  padding: 10px 15px;
  background: #3498db;
  color: white;
  display: flex;
  align-items: center;
  font-size: 1.2rem;
  font-weight: 600;
}

.panel-header span {
  margin-right: 12px;
  font-size: 1.6rem;
}

.panel-body {
  flex: 1;
}

textarea {
  width: 100%;
  height: 560px;
  border: none;
  padding: 15px;
  font-size: 15px;
  line-height: 1.5;
  resize: none;
  outline: none;
  transition: all 0.3s ease;
}

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

.btn {
  padding: 14px 54px;
  border: none;
  border-radius: 8px;
  font-size: 1.1rem;
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s ease;
  display: flex;
  align-items: center;
  gap: 10px;
}

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

.btn-primary:hover {
  background: #2980b9;
  transform: translateY(-2px);
}

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

.btn-success:hover {
  background: #27ae60;
  transform: translateY(-2px);
}

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

.btn-warning:hover {
  background: #d35400;
  transform: translateY(-2px);
}

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

.btn-danger:hover {
  background: #c0392b;
  transform: translateY(-2px);
}

.features {
  background: white;
  border-radius: 12px;
  padding: 20px;
  margin-bottom: 25px;
  box-shadow: 0 5px 20px rgba(0, 0, 0, 0.08);
}

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

.feature-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
  margin-bottom: 25px;
}

.feature-card {
  background: #f8f9fa;
  padding: 20px;
  border-radius: 10px;
  text-align: center;
  transition: transform 0.3s ease;
  border: 1px solid #ddd;
}

.feature-icon {
  font-size: 3rem;
  margin-bottom: 20px;
}

.feature-card h3 {
  margin-bottom: 15px;
  color: #3498db;
}

.tip p{
  margin-top: 15px;
  font-size: 1rem;
  opacity: 0.85;
}


footer {
  text-align: center;
  color: #7f8c8d;
  font-size: 1rem;
}

.notice {
  position: fixed;
  bottom: 30px;
  left: 50%;
  transform: translateX(-50%);
  background: rgba(0, 0, 0, 0.85);
  color: white;
  padding: 18px 35px;
  border-radius: 50px;
  font-size: 1.1rem;
  display: none;
  z-index: 1000;
  box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
}