/* ========== 全局变量与重置 ========== */
:root {
  --primary-color: #000000;
  --secondary-color: #ffffff;
  --accent-color: #f5f5f5;
  --text-color: #333333;
  --transition-speed: 0.3s;
  --border-radius: 5px;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: 'Noto Sans SC', sans-serif;
  line-height: 1.6;
  color: var(--text-color);
  background-color: var(--secondary-color);
  overflow-x: hidden;
}

/* ========== 导航栏样式 ========== */
.navigation {
  background-color: var(--primary-color);
  color: var(--secondary-color);
  position: fixed;
  width: 100%;
  top: 0;
  left: 0;
  z-index: 500;
}

.header {
  padding: 15px;
  text-align: center;
  transition: padding 0.3s ease;
}

.header h1 {
  margin: 0;
  padding: 10px;
  font-size: 1.8rem;
  font-weight: 700;
}

.navigation ul {
  list-style-type: none;
  padding: 0;
  margin: 0;
  display: flex;
  justify-content: center;
  align-items: center;
}

.navigation li {
  margin: 0 10px;
}

.nav-link {
  color: var(--secondary-color);
  text-decoration: none;
  padding: 12px 20px;
  border-radius: var(--border-radius) var(--border-radius) 0 0;
  transition: all var(--transition-speed) ease;
  font-weight: 500;
  display: inline-block;
}

.nav-footer-link {
  text-decoration: none;
  padding: 12px 20px;
  border-radius: var(--border-radius);
  transition: all var(--transition-speed) ease;
  font-weight: 500;
  display: inline-block;
}

.nav-link:hover,
.nav-footer-link:hover {
  background-color: rgb(71, 71, 71);
  color: white;
}

.nav-link.active {
  background-color: var(--secondary-color);
  color: var(--primary-color);
}

/* ========== 页面内容区域 ========== */
.content {
  padding: 180px 0 50px;
  min-height: calc(100vh - 100px);
  position: relative;
}

.page {
  max-width: 1200px;
  margin: 0 auto;
  opacity: 0;
  visibility: hidden;
  transform: translateY(20px);
  transition: opacity 0.4s ease, transform 0.4s ease, visibility 0.4s;
  position: absolute;
  width: 100%;
  top: 180px;
  left: 0;
  right: 0;
  padding: 0 20px;
}

.page.visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
  position: relative;
  top: auto;
}

/* ========== 通用组件样式 ========== */
h2 {
  font-size: 2rem;
  margin-bottom: 2rem;
  color: var(--primary-color);
  position: relative;
  display: inline-block;
  font-weight: 600;
}

h2::after {
  content: '';
  position: absolute;
  width: 50%;
  height: 2px;
  bottom: -8px;
  left: 0;
  background-color: var(--primary-color);
}

/* 卡片样式 */
.welcome-card {
  background-color: var(--secondary-color);
  border: 1px solid rgba(0, 0, 0, 0.1);
  border-radius: var(--border-radius);
  padding: 2rem;
  margin-bottom: 2rem;
  box-shadow: 0 4px 6px rgba(0, 0, 0, 0.05);
  transition: transform var(--transition-speed), box-shadow var(--transition-speed);
}

.welcome-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
}

/* 搜索栏 */
.search-bar {
  display: flex;
  margin-bottom: 2rem;
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
  height: 46px;
  align-items: stretch;
  position: relative;
}

.search-bar input {
  flex: 1;
  padding: 0.8rem 1rem;
  border: 1px solid #ddd;
  border-radius: var(--border-radius) 0 0 var(--border-radius);
  font-family: inherit;
  font-size: 1rem;
  outline: none;
  transition: border-color var(--transition-speed);
  height: 100%;
  border-right: none;
}

.search-btn {
  padding: 0 1.5rem;
  background-color: var(--primary-color);
  color: var(--secondary-color);
  border: none;
  border-radius: 0 var(--border-radius) var(--border-radius) 0;
  cursor: pointer;
  transition: background-color var(--transition-speed);
  font-family: inherit;
  font-weight: 500;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
}

.search-btn:hover {
  background-color: #333;
}

/* 加载动画 */
.loading {
  display: none;
  border: 4px solid #f3f3f3;
  border-top: 4px solid var(--primary-color);
  border-radius: 50%;
  width: 20px;
  height: 20px;
  animation: spin 1s linear infinite;
  position: absolute;
  right: 10px;
  top: 13px;
}

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

  100% {
    transform: rotate(360deg);
  }
}

/* 表格样式 */
.table-container {
  overflow-x: auto;
}

table {
  width: 100%;
  border-collapse: collapse;
  margin: 1rem 0;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
  border-radius: var(--border-radius);
  overflow: hidden;
}

th,
td {
  padding: 12px 15px;
  text-align: center;
  border: 1px solid #ddd;
}

th {
  background-color: var(--primary-color);
  color: var(--secondary-color);
  font-weight: 500;
}

tr:nth-child(even) {
  background-color: #f9f9f9;
}

tr:hover {
  background-color: #f1f1f1;
}

/* 按钮样式 */
button,
.AppsTable button {
  padding: 10px 20px;
  background-color: var(--primary-color);
  color: var(--secondary-color);
  border: none;
  border-radius: var(--border-radius);
  cursor: pointer;
  transition: all var(--transition-speed);
  font-family: inherit;
  font-weight: 500;
}

button:hover,
.AppsTable button:hover {
  background-color: #333;
  transform: translateY(-2px);
}

/* 分页样式 */
.pagination {
  display: flex;
  justify-content: center;
  gap: 10px;
  margin-top: 1rem;
}

.pagination button {
  padding: 8px 16px;
}

.pagination button:disabled {
  background-color: #ccc;
  cursor: not-allowed;
}

/* 留言界面 */
.message-container {
  max-width: 600px;
  margin: 0 auto;
  padding: 2rem;
  background-color: var(--secondary-color);
  border-radius: var(--border-radius);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
}

.message-description {
  color: #666;
  margin-bottom: 2rem;
  text-align: center;
  font-size: 0.95rem;
}

.message-form {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.form-group {
  position: relative;
}

.form-group label {
  display: block;
  margin-bottom: 0.5rem;
  font-weight: 500;
  color: var(--primary-color);
}

.char-count {
  font-size: 0.8rem;
  color: #999;
  font-weight: normal;
  float: right;
}

.error {
  color: #e74c3c;
  font-size: 0.8rem;
  margin-top: 0.2rem;
  display: none;
}

.message-form input,
.message-form textarea {
  width: 100%;
  padding: 0.8rem 0;
  border: none;
  border-bottom: 1px solid #ddd;
  background-color: transparent;
  font-family: inherit;
  transition: all var(--transition-speed);
}

.message-form textarea {
  min-height: 120px;
  resize: vertical;
  line-height: 1.5;
}

.input-border {
  position: absolute;
  bottom: 0;
  left: 0;
  width: 0;
  height: 2px;
  background-color: var(--primary-color);
  transition: width var(--transition-speed);
}

.message-form input:focus,
.message-form textarea:focus {
  outline: none;
  border-bottom-color: transparent;
}

.message-form input:focus~.input-border,
.message-form textarea:focus~.input-border {
  width: 100%;
}

.form-actions {
  display: flex;
  justify-content: space-between;
  margin-top: 1.5rem;
}

.submit-btn {
  background-color: var(--primary-color);
  color: var(--secondary-color);
  flex: 1;
  margin-right: 0.5rem;
}

.reset-btn {
  background-color: #f5f5f5;
  color: #666;
  flex: 1;
  margin-left: 0.5rem;
  transition: all var(--transition-speed);
}

.reset-btn:hover {
  background-color: #e0e0e0;
}

/* 特性卡片 */
.feature-item {
  text-align: center;
  padding: 1.5rem;
  border: 1px solid rgba(0, 0, 0, 0.1);
  border-radius: var(--border-radius);
  transition: all var(--transition-speed) ease;
  background-color: var(--secondary-color);
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
  margin: 0 0.5rem;
}

.feature-item:hover {
  border-color: var(--primary-color);
  transform: translateY(-5px);
  box-shadow: 0 6px 12px rgba(0, 0, 0, 0.1);
}

.feature-icon {
  width: 60px;
  height: 60px;
  background-color: #f5f5f5;
  border-radius: 50%;
  margin: 0 auto 1rem;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  color: var(--primary-color);
  border: 1px solid rgba(0, 0, 0, 0.08);
}

/* 页脚 */
.footer {
  background-color: var(--primary-color);
  color: var(--secondary-color);
  padding: 1.5rem;
  text-align: center;
}

.footer a {
  color: var(--secondary-color);
  text-decoration: none;
  transition: color var(--transition-speed);
}

.footer a:hover {
  color: #A9A9A9;
  text-decoration: underline;
}

/* 响应式设计 */
@media (max-width: 768px) {
  .header h1 {
    font-size: 1.5rem;
  }

  .navigation ul {
    flex-wrap: wrap;
  }

  .nav-link {
    padding: 8px 12px;
    font-size: 0.9rem;
  }

  .content {
    padding: 150px 15px 40px;
  }

  .search-bar {
    height: 40px;
  }

  .search-bar input {
    padding: 0.6rem 0.8rem;
    font-size: 0.9rem;
  }

  .search-btn {
    padding: 0 1rem;
    font-size: 0.9rem;
  }

  h2 {
    font-size: 1.5rem;
  }

  table {
    font-size: 0.9rem;
  }

  th,
  td {
    padding: 8px 10px;
  }

  .message-container {
    padding: 1.5rem;
  }

  .form-actions {
    flex-direction: column;
    gap: 0.8rem;
  }

  .submit-btn,
  .reset-btn {
    margin: 0;
    width: 100%;
  }

  .reset-btn.resetting {
    transform: rotate(360deg);
    transition: transform 0.5s ease;
  }

  .table-container::before {
    content: "← 左右滑动查看 →";
    display: block;
    text-align: center;
    color: #666;
    margin-bottom: 0.5rem;
  }
}