/* 引入本地字体 */
@font-face {
  font-family: 'Roboto';
  src: url('../fonts/Roboto-Regular.ttf') format('truetype');
}

/* 全局样式 */
body {
  margin: 0;
  font-family: 'Roboto', sans-serif;
  background-color: var(--background-color);
  color: var(--text-color);
  scroll-behavior: smooth;
}

/* 全局颜色变量 */
:root {
  --primary-color: #4CAF50;
  --secondary-color: #FFC107;
  --nav-bg-color: rgba(255, 255, 255, 0.9);
  --nav-text-color: #333;
  --background-color: #f5f5f5;
  --text-color: #333;
  --body-bg-color: #ffffff;
  --body-text-color: #000000;
}

body.dark-mode {
  --nav-bg-color: rgba(34, 34, 34, 0.9);
  --nav-text-color: #ddd;
  --background-color: #121212;
  --text-color: #ccc;
  --body-bg-color: #121212;
  --body-text-color: #ccc;
}

/* 顶部导航栏 */
.top-nav {
  position: fixed;
  top: 0;
  width: 100%;
  height: 70px;
  background-color: var(--nav-bg-color);
  color: var(--nav-text-color);
  display: flex;
  align-items: center;
  padding: 0 20px;
  z-index: 1000;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
}

.top-nav .logo {
  display: flex;
  align-items: center;
}

.logo-icon {
  width: 40px;
  height: 40px;
  margin-right: 10px;
}

.nav-center {
  flex: 1;
  display: flex;
  justify-content: flex-start; /* 向左对齐 */
  margin-left: 50px; /* 调整左边距 */
}

.nav-center a {
  color: var(--nav-text-color);
  margin: 0 15px;
  text-decoration: none;
  font-size: 18px;
  padding: 10px 15px;
  border-radius: 5px;
  transition: background-color 0.3s, color 0.3s;
}

.nav-center a:hover {
  background-color: var(--primary-color);
  color: #fff;
}

.nav-right {
  display: flex;
  align-items: center;
}

#theme-toggle, .menu-toggle {
  font-size: 24px;
  color: var(--nav-text-color);
  background: none;
  border: none;
  cursor: pointer;
  margin-right: 20px;
}

.account-icon {
  font-size: 30px;
  color: var(--nav-text-color);
  margin-right: 20px; /* 添加右边距，避免超出 */
}

#theme-icon {
  font-size: 24px;
  color: var(--nav-text-color);
}

.menu-toggle {
  display: none;
}

/* 左侧导航栏 */
.side-nav {
  position: fixed;
  left: 0;
  top: 70px;
  width: 200px;
  background-color: #444;
  height: calc(100% - 70px);
  color: #fff;
  overflow-y: auto;
  transition: width 0.3s, left 0.3s;
}

.side-nav.collapsed {
  width: 50px;
}

.side-nav ul {
  list-style-type: none;
  padding: 0;
}

.side-nav ul li {
  padding: 10px;
  display: flex;
  align-items: center;
  transition: background-color 0.3s;
}

.side-nav ul li i {
  margin-right: 10px;
}

.side-nav ul li:hover {
  background-color: #555;
  cursor: pointer;
}

.side-nav.collapsed ul li {
  justify-content: center;
}

.side-nav.collapsed ul li span {
  display: none;
}

#collapse-btn {
  background-color: #444;
  color: #fff;
  border: none;
  width: 100%;
  padding: 10px;
  cursor: pointer;
}

#collapse-btn i {
  font-size: 18px;
  transition: transform 0.3s;
}

.side-nav.collapsed #collapse-btn i {
  transform: rotate(180deg); /* 反转箭头方向 */
}

/* 主内容区域 */
.main-content {
  margin-left: 200px;
  margin-top: 70px;
  padding: 20px;
  min-height: calc(100vh - 70px - 50px);
  background-color: var(--body-bg-color);
  color: var(--body-text-color);
  transition: margin-left 0.3s;
}

.side-nav.collapsed + .main-content {
  margin-left: 50px;
}

/* 卡片样式 */
.card {
  background-color: #fff;
  border-radius: 8px;
  box-shadow: 0 1px 3px rgba(0,0,0,0.1);
  padding: 20px;
  margin-bottom: 20px;
}

/* 版权声明 */
.footer {
  text-align: center;
  padding: 5px; /* 调整为更窄的高度 */
  background-color: var(--nav-bg-color);
  color: var(--nav-text-color);
  position: fixed;
  bottom: 0;
  width: 100%;
  font-size: 12px; /* 调整字体大小 */
}

/* 加载动画 */
.loader {
  border: 6px solid #f3f3f3;
  border-top: 6px solid var(--primary-color);
  border-radius: 50%;
  width: 40px;
  height: 40px;
  animation: spin 1s linear infinite;
  margin: 100px auto;
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}

@keyframes spin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}

/* 登录页面样式 */
body.login-page {
  background: linear-gradient(135deg, #81c784, #64b5f6);
}

.login-container {
  background: #fff;
  padding: 40px;
  border-radius: 10px;
  box-shadow: 0 2px 10px rgba(0,0,0,0.1);
  max-width: 400px;
  margin: 100px auto;
  text-align: center;
}

.login-container h1 {
  margin-bottom: 20px;
}

.login-container input[type="text"], .login-container input[type="password"] {
  border: 1px solid #ccc;
  border-radius: 4px;
  padding: 10px;
  margin-bottom: 20px;
  width: 100%;
  box-sizing: border-box;
}

.login-container input[type="text"]:focus, .login-container input[type="password"]:focus {
  border-color: var(--primary-color);
  outline: none;
}

.login-container button {
  background-color: var(--primary-color);
  color: #fff;
  border: none;
  border-radius: 5px;
  padding: 10px;
  width: 100%;
  font-size: 16px;
  cursor: pointer;
  transition: background-color 0.3s, transform 0.2s;
}

.login-container button:hover {
  background-color: #388e3c;
  transform: scale(1.05);
}

.login-container button:active {
  transform: scale(0.95);
}

/* 响应式设计 */
@media screen and (max-width: 768px) {
  .top-nav .nav-center {
    display: none;
  }

  .menu-toggle {
    display: block;
  }

  .side-nav {
    left: -200px;
  }

  .side-nav.open {
    left: 0;
  }

  .main-content {
    margin-left: 0;
  }
}

/* 平滑的过渡效果 */
button, .nav-center a, .side-nav ul li {
  transition: background-color 0.3s, color 0.3s;
}

/* 淡入效果 */
.fade-in {
  animation: fadeIn 1s;
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

/* 错误页面样式 */
.error-page {
  text-align: center;
  padding: 100px 20px;
}

.error-page h1 {
  font-size: 100px;
  margin: 0;
}

.error-page h2 {
  font-size: 24px;
  margin: 20px 0;
}

.error-page p {
  font-size: 16px;
  margin-bottom: 30px;
}

.error-page .btn {
  display: inline-block;
  padding: 10px 20px;
  background-color: var(--primary-color);
  color: #fff;
  text-decoration: none;
  border-radius: 5px;
  transition: background-color 0.3s;
}

.error-page .btn:hover {
  background-color: #388e3c;
}

/* 上传表单样式 */
#upload-form {
  margin-top: 20px;
}

#upload-form input[type="file"] {
  margin-right: 10px;
}

#upload-status {
  margin-top: 10px;
  color: green;
}

#file-list ul {
  list-style-type: none;
  padding: 0;
}

#file-list li {
  margin-bottom: 5px;
}