* {
  margin: 0;
  padding: 0;
}

body {
  background-color: #f1f2f3;
}

.container {
  box-sizing: border-box;
  max-width: 1560px;
  min-width: 1240px;
  width: 100%;
  margin: 20px auto;
  color: #333;
  line-height: 1.6;
}

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

header {
  margin-bottom: 20px;
  text-align: center;
}

header h1 {
  font-size: 2.1rem;
  margin-bottom: 5px;
}

header p{
  font-size: 1rem;
  opacity: 0.9;
  margin: 0 auto;
}

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

.input-section,
.output-section {
  flex: 1;
  background: white;
  border-radius: 12px;
  box-shadow: 0 6px 15px rgba(0, 0, 0, 0.08);
  overflow: hidden;
}

.section-header {
  background: #88a1b1;
  color: white;
  padding: 10px 15px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.section-title {
  font-size: 1.15rem;
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 8px;
}

textarea {
  width: 100%;
  height: 580px;
  padding: 15px;
  font-size: 15px;
  border: none;
  resize: none;
  outline: none;
  background: #f8f9fa;
  color: #2c3e50;
  line-height: 1.6;
}

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

.btn {
  padding: 12px 36px;
  font-size: 16px;
  font-weight: 600;
  border: none;
  border-radius: 8px;
  cursor: pointer;
  transition: all 0.3s ease;
  display: flex;
  align-items: center;
  gap: 8px;
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
}

.btn-select{
  padding: 12px 36px;
  font-size: 16px;
  font-weight: 600;
  border-radius: 8px;
  color: #2c3e50;
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
  border: 1px solid #ddd;
}

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

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

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

.btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 12px rgba(0, 0, 0, 0.15);
}

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

.features {
  background: white;
  border-radius: 12px;
  padding: 20px;
  box-shadow: 0 6px 15px rgba(0, 0, 0, 0.08);
  margin-bottom: 25px;
}

.features h2 {
  text-align: center;
  margin-bottom: 25px;
  color: #2c3e50;
  font-size: 1.6rem;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 25px;
}

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

.feature-icon {
  font-size: 2.5rem;
  margin-bottom: 15px;
}

.feature-card h3 {
  margin-bottom: 12px;
  color: #3498db;
}

.feature-card p {
  color: #7f8c8d;
  line-height: 1.6;
}

footer {
  text-align: center;
  color: #7f8c8d;
}

.notice {
  position: fixed;
  bottom: 30px;
  left: 50%;
  transform: translateX(-50%);
  background: rgba(0, 0, 0, 0.85);
  color: white;
  padding: 15px 30px;
  border-radius: 8px;
  font-size: 16px;
  z-index: 1000;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.3s, visibility 0.3s;
}

.notice.show {
  opacity: 1;
  visibility: visible;
}