:root {
  --primary-color: #4299e1;
  --secondary-color: #2563eb;
  --background-color: #f0f4f8;
  --text-color: #333333;
  --font-family: 'Noto Sans SC', sans-serif;
  --nav-font-family: 'Quicksand', 'Noto Sans SC', sans-serif;
}

body {
  font-family: var(--font-family);
  background-color: var(--background-color);
  color: var(--text-color);
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

@media (min-width: 640px) {
  .container {
    padding-left: 1.5rem;
    padding-right: 1.5rem;
  }
}

@media (min-width: 1024px) {
  .container {
    padding-left: 2rem;
    padding-right: 2rem;
  }
}

.img-cover {
  object-fit: cover;
  object-position: center;
}

.btn {
  padding: 0.5rem 1rem;
  border-radius: 0.375rem;
  font-weight: 600;
  transition: background-color 0.3s ease;
}

.btn-primary {
  background-color: var(--primary-color);
  color: white;
}

.btn-primary:hover {
  background-color: var(--secondary-color);
}

.input {
  border: 1px solid #e2e8f0;
  border-radius: 0.375rem;
  padding: 0.5rem;
  transition: border-color 0.3s ease, box-shadow 0.3s ease;
}

.input:focus {
  outline: none;
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgba(66, 153, 225, 0.5);
}

.card {
  background-color: white;
  border-radius: 0.5rem;
  box-shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px 0 rgba(0, 0, 0, 0.06);
  padding: 1rem;
}

.nav-link {
  color: #ffffff;
  font-weight: 600;
  transition: all 0.3s ease;
  padding: 0.375rem 0.5rem;
  border-radius: 0.375rem;
  font-size: 1rem;
  display: inline-flex;
  align-items: center;
  font-family: var(--nav-font-family);
  position: relative;
  overflow: hidden;
}

.nav-link:hover,
.nav-link:focus,
.nav-link.active {
  color: #ffffff;
  background-color: rgba(255, 255, 255, 0.2);
}

.nav-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background-color: #fff;
  transition: width 0.3s ease;
}

.nav-link:hover::after,
.nav-link.active::after {
  width: 100%;
}

.dropdown {
  position: relative;
}

.dropdown-menu {
  display: none;
  position: absolute;
  top: 100%;
  left: 0;
  background-color: #ffffff;
  border: 1px solid #e2e8f0;
  border-radius: 0.375rem;
  padding: 0.5rem 0;
  z-index: 10;
  min-width: 150px;
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
  transform: translateY(-10px);
  opacity: 0;
  transition: transform 0.3s ease, opacity 0.3s ease;
}

.dropdown:hover .dropdown-menu {
  display: block;
  transform: translateY(0);
  opacity: 1;
}

.dropdown-menu a {
  display: block;
  padding: 0.5rem 1rem;
  color: var(--text-color);
  transition: background-color 0.3s ease, color 0.3s ease;
}

.dropdown-menu a:hover {
  background-color: var(--primary-color);
  color: #ffffff;
}

/* 添加动画关键帧 */
@keyframes fadeInDown {
  from {
    opacity: 0;
    transform: translate3d(0, -20px, 0);
  }
  to {
    opacity: 1;
    transform: translate3d(0, 0, 0);
  }
}

.nav-animation {
  animation: fadeInDown 0.5s ease-out;
}

.logo-container {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.logo-container img {
  width: 2.5rem;
  height: 2.5rem;
}

/* .space-x-6 > :not([hidden]) ~ :not([hidden]) {
  --tw-space-x-reverse: 0;
  margin-right: calc(0.25rem * var(--tw-space-x-reverse));
  margin-left: calc(0.25rem * calc(1 - var(--tw-space-x-reverse)));
} */

.main-content {
  padding-top: 1rem;
  flex-grow: 1;
}

body {
  padding-top: 0; /* 移除顶部的空白 */
}

#navbar-placeholder {
  margin-bottom: 1rem; /* 在导航栏下方添加一些间距 */
}

nav {
  background: linear-gradient(90deg, #4299e1, #667eea);
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
  border-radius: 0 0 15px 15px;
}

nav img[alt="User"] {
  border: 2px solid #fff;
  transition: transform 0.3s ease;
}

nav img[alt="User"]:hover {
  transform: scale(1.1);
}

.content {
  max-height: 4.5rem; /* 限制初始高度 */
  overflow: hidden;
  position: relative;
  transition: max-height 0.5s ease; /* 添加过渡效果 */
}

.content.expanded {
  max-height: none; /* 展开时取消高度限制 */
}

.toggle-button {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-weight: 600;
  cursor: pointer;
  transition: color 0.3s ease;
}

.toggle-button:hover {
  color: #2563eb; /* 更改为悬停时的颜色 */
}

.toggle-button i {
  transition: transform 0.3s ease; /* 添加图标旋转过渡效果 */
}

.content.expanded + .toggle-button i {
  transform: rotate(180deg); /* 展开时旋转图标 */
}

.flex.items-center.justify-between {
  margin-top: 1rem;
}

.flex.justify-center.mb-4 {
  margin-top: 1rem;
}