body {
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  min-height: 100vh;
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
}

.hero {
  background: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
  color: white;
  border-radius: 0 0 50px 50px;
}

.navbar {
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

.card {
  border: none;
  border-radius: 15px;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
  overflow: hidden;
}

.card:hover {
  transform: translateY(-5px);
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.15);
}

.card-header {
  border-radius: 15px 15px 0 0 !important;
}

.btn {
  border-radius: 25px;
  font-weight: 600;
  transition: all 0.3s ease;
}

.btn:hover {
  transform: translateY(-2px);
  box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
}

.form-control {
  border-radius: 10px;
  border: 2px solid #e9ecef;
  transition: border-color 0.3s ease;
}

.form-control:focus {
  border-color: #007bff;
  box-shadow: 0 0 0 0.2rem rgba(0, 123, 255, 0.25);
}

.card-img-top {
  transition: transform 0.3s ease;
}

.card:hover .card-img-top {
  transform: scale(1.05);
}

/* 移动端优化 */
@media (max-width: 768px) {
  .hero {
    padding: 3rem 0;
  }

  .card {
    margin-bottom: 1rem;
  }

  .btn {
    width: 100%;
    margin-bottom: 0.5rem;
  }

  .d-flex.gap-2 {
    flex-direction: column;
  }

  .d-flex.gap-2 .btn {
    width: 100%;
  }

  /* 返回顶部按钮移动端样式 */
  #scrollToTopBtn {
    bottom: 30px;
    right: 15px;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    font-size: 18px;
    display: flex;
    align-items: center;
    justify-content: center;
  }

  /* 任务卡片图片缩略图移动端调整 */
  .card-img-top {
    height: 150px !important;
  }
}