body {
  font-family: "Microsoft YaHei", Arial, sans-serif;
  max-width: 900px;
  margin: 30px auto;
  padding: 20px;
  background: #f7f7f7;
  color: #333;
}

h1 {
  text-align: center;
  color: #2c3e50;
}

.card {
  background: #fff;
  border-radius: 12px;
  padding: 24px;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.08);
}

.row {
  margin-bottom: 18px;
}

label {
  display: block;
  font-weight: bold;
  margin-bottom: 6px;
}

input[type="file"] {
  padding: 8px;
  border: 1px solid #ccc;
  border-radius: 6px;
  width: 100%;
  box-sizing: border-box;
}

button {
  background: #2c7be5;
  color: #fff;
  border: none;
  padding: 12px 24px;
  font-size: 16px;
  border-radius: 8px;
  cursor: pointer;
  width: 100%;
  transition: background 0.2s;
}

button:hover {
  background: #1a5bbf;
}

button:disabled {
  background: #aaa;
  cursor: not-allowed;
}

#status {
  margin-top: 14px;
  padding: 10px;
  border-radius: 6px;
  background: #eef6ff;
  color: #1a5bbf;
  display: none;
  white-space: pre-wrap;
}

.tip {
  font-size: 13px;
  color: #666;
  line-height: 1.7;
  margin-top: 10px;
}