* {
  margin: 0;
  padding: 0;
}

body {
  background-color: #f1f2f3;
}

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

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

header {
  text-align: center;
  margin-bottom: 25px;
}

header h1 {
  font-size: 2.2rem;
  margin-bottom: 5px;
}

header p {
  font-size: 1rem;
  opacity: 0.9;
  max-width: 95%;
  margin: 0 auto;
}

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

.upload-area {
  flex: 1;
  background-color: #fff;
  border-radius: 12px;
  padding: 20px;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.08);
  text-align: center;
  border: 2px dashed #ddd;
  transition: all 0.3s;
}

.upload-area.active {
  border-color: #3498db;
  background-color: #f7f9ff;
}

.upload-icon {
  font-size: 4rem;
  margin-bottom: 20px;
}

.upload-text {
  margin-bottom: 25px;
  font-size: 1.1rem;
  color: #555;
}

.btn {
  background-color: #3498db;
  color: white;
  border: none;
  padding: 12px 36px;
  border-radius: 6px;
  cursor: pointer;
  font-size: 1rem;
  transition: background-color 0.3s;
}

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

.btn:disabled {
  background-color: #bdc3c7;
  cursor: not-allowed;
}

.result-area {
  flex: 1;
  background-color: #fff;
  border-radius: 12px;
  padding: 20px;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.08);
  text-align: center;
}

.result-title {
  font-size: 1.3rem;
  margin-bottom: 15px;
  color: #2c3e50;
  width: 100%;
  text-align: left;
}

.preview-container {
  min-height: 250px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid #eee;
  border-radius: 8px;
  padding: 15px;
  margin-bottom: 15px;
}

.preview-image {
  max-width: 100%;
  max-height: 300px;
  display: none;
}

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

.download-btn:hover {
  background-color: #219653;
}

.notice {
  position: fixed;
  bottom: 30px;
  left: 50%;
  transform: translateX(-50%);
  background-color: #2c3e50;
  color: white;
  padding: 15px 25px;
  border-radius: 8px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
  opacity: 0;
  transition: opacity 0.3s;
  z-index: 1000;
}

.notice.show {
  opacity: 1;
}

.instructions {
  background-color: #fff;
  border-radius: 12px;
  padding: 20px;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.08);
  margin-bottom: 25px;
}

.instructions h2 {
  color: #2c3e50;
  margin-top: 0;
}

.instructions p{
  margin-top: 10px;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin-top: 30px;
}

.feature {
  text-align: center;
  padding: 20px;
  background-color: #f9f9f9;
  border-radius: 8px;
}

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

footer {
  text-align: center;
  font-size: 15px;
  color: #7f8c8d;
}

.tip {
  background-color: #fff8e1;
  padding: 20px;
  border-radius: 8px;
  margin: 20px 0;
  border-left: 4px solid #ffc107;
}