* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
}

.login-container {
  min-height: 100vh;
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  display: flex;
  align-items: center;
  justify-content: center;
}

.login-box {
  background: #fff;
  border-radius: 10px;
  padding: 50px;
  width: 400px;
  box-shadow: 0 10px 40px rgba(0,0,0,0.2);
}

.logo {
  text-align: center;
  margin-bottom: 40px;
}

.logo img {
  width: 80px;
  height: 80px;
  margin-bottom: 15px;
}

.logo h1 {
  font-size: 24px;
  color: #333;
}

.form-group {
  margin-bottom: 20px;
}

.form-group input {
  width: 100%;
  height: 45px;
  border: 1px solid #ddd;
  border-radius: 5px;
  padding: 0 15px;
  font-size: 14px;
}

.form-group input:focus {
  outline: none;
  border-color: #4A90E2;
}

.captcha {
  display: flex;
  gap: 10px;
}

.captcha input {
  flex: 1;
}

.captcha img {
  width: 120px;
  height: 45px;
  cursor: pointer;
  border-radius: 5px;
}

.btn-login {
  width: 100%;
  height: 45px;
  background: #4A90E2;
  color: #fff;
  border: none;
  border-radius: 5px;
  font-size: 16px;
  cursor: pointer;
  transition: background 0.3s;
}

.btn-login:hover {
  background: #357ABD;
}