* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: "Microsoft YaHei", sans-serif;
}

body {
  /* 校园清新蓝渐变背景 */
  background: linear-gradient(135deg, #f0f7ff 0%, #e6f0ff 100%);
  min-height: 100vh;
  padding: 20px;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
}

.navbar {
  background-color: #165DFF;
  padding: 14px 20px;
  border-radius: 8px;
  margin-bottom: 24px;
}
.navbar a {
  color: white;
  text-decoration: none;
  font-size: 17px;
  margin-right: 22px;
}
.navbar a.active {
  font-weight: bold;
  text-decoration: underline;
}

.search-bar {
  display: flex;
  gap: 12px;
  margin-bottom: 24px;
}
.search-bar input, .search-bar select {
  padding: 10px 12px;
  border: 1px solid #dcdfe6;
  border-radius: 6px;
  font-size: 15px;
  flex: 1;
}

.course-wrap {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 20px;
}
.course-card, .form-card, .detail-card {
  background-color: #ffffff;
  padding: 22px;
  border-radius: 10px;
  box-shadow: 0 2px 12px rgba(0,0,0,0.08);
}
.course-card p {
  margin: 8px 0;
  color: #444;
}
.btn {
  padding: 8px 16px;
  border: none;
  border-radius: 5px;
  cursor: pointer;
  font-size: 15px;
  margin-top: 12px;
}
.btn-primary {
  background-color: #165DFF;
  color: white;
}
.btn-back {
  background-color: #6b8fff;
  color: white;
}
.loading {
  text-align: center;
  font-size: 18px;
  padding: 40px;
  color: #666;
}
.form-item {
  margin-bottom: 16px;
}
.form-item label {
  display: block;
  margin-bottom: 6px;
  font-weight: 500;
}
.form-item input {
  width: 100%;
  padding: 10px;
  border: 1px solid #ddd;
  border-radius: 6px;
}
.detail-item {
  margin: 12px 0;
  font-size: 16px;
}

/* ========== 移动端适配 ========== */
@media (max-width: 768px) {
  body {
    padding: 12px;
  }
  .search-bar {
    flex-direction: column;
  }
  .course-wrap {
    grid-template-columns: 1fr; /* 手机单列展示卡片 */
  }
  .navbar a {
    font-size: 16px;
    margin-right: 14px;
  }
}