* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
  font-family: "Microsoft Yahei", sans-serif;
}
body {
  background: #f5f7fa;
  padding: 20px;
  max-width: 800px;
  margin: 0 auto;
}
.card {
  background: white;
  border-radius: 12px;
  padding: 20px;
  margin-bottom: 15px;
  box-shadow: 0 2px 10px rgba(0,0,0,0.06);
}
h1, h2, h3, h4 {
  margin-bottom: 15px;
  color: #333;
}
input, select, button {
  width: 100%;
  padding: 10px 12px;
  margin-bottom: 10px;
  border: 1px solid #ddd;
  border-radius: 6px;
  font-size: 14px;
}
button {
  background: #3377ff;
  color: white;
  border: none;
  cursor: pointer;
}
button.danger {
  background: #ff4d4f;
}
a {
  color: #3377ff;
  text-decoration: none;
}
.table {
  width: 100%;
  border-collapse: collapse;
  background: white;
  border-radius: 8px;
  overflow: hidden;
}
.table th, .table td {
  padding: 10px;
  text-align: left;
  border-bottom: 1px solid #eee;
}
.table th {
  background: #f8f9fa;
}
.msg {
  padding: 10px;
  border-radius: 6px;
  margin-bottom: 10px;
}
.msg.success {
  background: #e6ffed;
  color: #00b42a;
}
.msg.error {
  background: #fff2f0;
  color: #ff4d4f;
}