/* 管理后台样式 v3 */
:root {
  --primary: #1a5276;
  --primary-light: #2980b9;
  --primary-dark: #0e2f44;
  --success: #27ae60;
  --danger: #e74c3c;
  --warning: #f39c12;
  --info: #3498db;
  --gray-50: #f8f9fa;
  --gray-100: #ecf0f1;
  --gray-200: #d5dbdb;
  --gray-400: #95a5a6;
  --gray-600: #7f8c8d;
  --gray-800: #2c3e50;
  --radius: 12px;
  --radius-sm: 8px;
  --shadow: 0 2px 12px rgba(0,0,0,0.06);
  --shadow-md: 0 4px 20px rgba(0,0,0,0.08);
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'PingFang SC', 'Microsoft YaHei', sans-serif;
  background: #f0f4f8;
  color: var(--gray-800);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

/* ===== 登录页 ===== */
.login-page {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary) 50%, var(--primary-light) 100%);
  padding: 20px;
}

.login-card {
  background: white;
  border-radius: 16px;
  padding: 44px 40px;
  width: 100%;
  max-width: 420px;
  box-shadow: 0 20px 60px rgba(0,0,0,0.2);
}

.login-header { text-align: center; margin-bottom: 32px; }
.login-logo { width: 80px; height: 80px; border-radius: 50%; margin-bottom: 16px; }
.login-header h1 { font-size: 22px; color: var(--primary); font-weight: 700; }
.login-header p { color: var(--gray-600); font-size: 13px; margin-top: 4px; }

.login-form .form-group { margin-bottom: 20px; }
.login-form label {
  display: flex;
  align-items: center;
  gap: 6px;
  margin-bottom: 6px;
  font-weight: 500;
  font-size: 14px;
  color: var(--gray-800);
}
.login-form label svg { color: var(--gray-400); }
.login-form input {
  width: 100%;
  padding: 12px 16px;
  border: 1.5px solid var(--gray-200);
  border-radius: var(--radius-sm);
  font-size: 15px;
  transition: all 0.2s;
  background: var(--gray-50);
}
.login-form input:focus { outline: none; border-color: var(--primary-light); background: white; box-shadow: 0 0 0 3px rgba(41,128,185,0.1); }

.error-text { color: var(--danger); font-size: 13px; text-align: center; margin-top: 12px; }

/* ===== 按钮 ===== */
.btn-primary {
  background: var(--primary);
  color: white;
  border: none;
  padding: 10px 20px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-size: 14px;
  font-weight: 500;
  transition: all 0.2s;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}
.btn-primary:hover { background: var(--primary-light); transform: translateY(-1px); box-shadow: 0 4px 12px rgba(26,82,118,0.2); }
.btn-primary:active { transform: translateY(0); }
.btn-block { width: 100%; justify-content: center; }
.btn-lg { padding: 14px 24px; font-size: 16px; border-radius: var(--radius); }
.btn-sm { padding: 6px 12px; font-size: 13px; }
.btn-outline {
  background: white;
  color: var(--primary);
  border: 1.5px solid var(--primary);
  padding: 10px 20px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-size: 14px;
  transition: all 0.2s;
  display: inline-flex;
  align-items: center;
  gap: 6px;
}
.btn-outline:hover { background: var(--primary); color: white; }
.btn-danger {
  background: var(--danger);
  color: white;
  border: none;
  padding: 6px 12px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  font-size: 13px;
  display: inline-flex;
  align-items: center;
  gap: 4px;
}
.btn-danger:hover { background: #c0392b; }
.btn-group { display: flex; gap: 10px; }

/* ===== 管理后台布局 ===== */
.admin-page { min-height: 100vh; flex-direction: column; }
.admin-header {
  background: white;
  padding: 0 24px;
  height: 62px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  box-shadow: 0 1px 4px rgba(0,0,0,0.06);
  position: sticky;
  top: 0;
  z-index: 100;
}
.header-left { display: flex; align-items: center; gap: 15px; }
.header-brand { display: flex; align-items: center; gap: 10px; }
.header-brand h2 { font-size: 17px; color: var(--primary); font-weight: 700; }
.header-right { display: flex; align-items: center; gap: 15px; }
.admin-user { display: flex; align-items: center; gap: 5px; font-size: 14px; color: var(--gray-600); }
.menu-toggle {
  display: none;
  background: none;
  border: none;
  cursor: pointer;
  color: var(--gray-800);
  padding: 4px;
  border-radius: 6px;
  transition: background 0.2s;
}
.menu-toggle:hover { background: var(--gray-100); }

.admin-layout { display: flex; flex: 1; }

/* 侧边栏 */
.sidebar {
  width: 220px;
  background: white;
  border-right: 1px solid var(--gray-100);
  padding: 16px 0;
  min-height: calc(100vh - 62px);
  position: sticky;
  top: 62px;
}
.sidebar-nav { display: flex; flex-direction: column; gap: 2px; }
.nav-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 11px 20px;
  color: var(--gray-600);
  text-decoration: none;
  font-size: 14px;
  transition: all 0.2s;
  border-left: 3px solid transparent;
  margin: 0 8px;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}
.nav-item:hover { background: var(--gray-50); color: var(--primary); }
.nav-item.active {
  background: rgba(26,82,118,0.06);
  color: var(--primary);
  border-left-color: var(--primary);
  font-weight: 600;
}
.nav-icon { flex-shrink: 0; }

/* 主内容 */
.main-content { flex: 1; padding: 28px; overflow-x: hidden; }
.page { display: none; }
.page.active { display: block; animation: pageIn 0.3s ease; }

@keyframes pageIn {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

.page h3 {
  margin-bottom: 24px;
  font-size: 20px;
  font-weight: 700;
  color: var(--gray-800);
}
.page-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 20px; }
.page-header h3 { margin-bottom: 0; }

/* 统计卡片 */
.stats-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: 18px;
  margin-bottom: 28px;
}
.stat-card {
  background: white;
  border-radius: var(--radius);
  padding: 22px;
  box-shadow: var(--shadow);
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 8px;
  transition: transform 0.2s, box-shadow 0.2s;
  border-left: 4px solid transparent;
}
.stat-card:hover { transform: translateY(-2px); box-shadow: var(--shadow-md); }
.stat-card-primary { border-left-color: var(--primary); }
.stat-card-success { border-left-color: var(--success); }
.stat-card-warning { border-left-color: var(--warning); }
.stat-card-info { border-left-color: var(--info); }

.stat-icon {
  width: 42px;
  height: 42px;
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
}
.stat-card-primary .stat-icon { background: rgba(26,82,118,0.1); color: var(--primary); }
.stat-card-success .stat-icon { background: rgba(39,174,96,0.1); color: var(--success); }
.stat-card-warning .stat-icon { background: rgba(243,156,18,0.1); color: var(--warning); }
.stat-card-info .stat-icon { background: rgba(52,152,219,0.1); color: var(--info); }

.stat-number { font-size: 32px; font-weight: 700; color: var(--gray-800); line-height: 1.2; }
.stat-card-primary .stat-number { color: var(--primary); }
.stat-card-success .stat-number { color: var(--success); }
.stat-card-warning .stat-number { color: var(--warning); }
.stat-card-info .stat-number { color: var(--info); }
.stat-label { color: var(--gray-600); font-size: 13px; }

/* 卡片 */
.card {
  background: white;
  border-radius: var(--radius);
  padding: 24px;
  box-shadow: var(--shadow);
  margin-bottom: 20px;
}
.card-header {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 8px;
  color: var(--primary);
}
.card-header h4 {
  font-size: 16px;
  font-weight: 600;
  color: var(--gray-800);
}
.card-desc {
  color: var(--gray-600);
  font-size: 14px;
  margin-bottom: 18px;
  line-height: 1.6;
}
.card h4 { margin-bottom: 15px; font-size: 16px; }

/* 热门问题列表 */
.top-item {
  display: flex;
  align-items: center;
  padding: 11px 0;
  border-bottom: 1px solid var(--gray-100);
}
.top-item:last-child { border-bottom: none; }
.top-rank {
  width: 28px;
  height: 28px;
  background: var(--primary);
  color: white;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 12px;
  font-weight: 700;
  margin-right: 14px;
  flex-shrink: 0;
}
.top-item:nth-child(1) .top-rank { background: linear-gradient(135deg, #f1c40f, #f39c12); }
.top-item:nth-child(2) .top-rank { background: linear-gradient(135deg, #bdc3c7, #95a5a6); }
.top-item:nth-child(3) .top-rank { background: linear-gradient(135deg, #e67e22, #d35400); }
.top-text { flex: 1; font-size: 14px; }
.top-count { color: var(--gray-400); font-size: 13px; font-weight: 500; }

/* 筛选栏 */
.filter-bar { display: flex; gap: 10px; margin-bottom: 20px; flex-wrap: wrap; }
.form-select, .form-input {
  padding: 9px 14px;
  border: 1.5px solid var(--gray-200);
  border-radius: var(--radius-sm);
  font-size: 14px;
  background: white;
  transition: border-color 0.2s;
}
.form-select:focus, .form-input:focus {
  outline: none;
  border-color: var(--primary-light);
  box-shadow: 0 0 0 3px rgba(41,128,185,0.08);
}
.form-select { min-width: 150px; }
.form-textarea {
  width: 100%;
  padding: 12px 14px;
  border: 1.5px solid var(--gray-200);
  border-radius: var(--radius-sm);
  font-size: 14px;
  resize: vertical;
  font-family: inherit;
  transition: border-color 0.2s;
}
.form-textarea:focus {
  outline: none;
  border-color: var(--primary-light);
  box-shadow: 0 0 0 3px rgba(41,128,185,0.08);
}
.form-group { margin-bottom: 16px; }
.form-group label {
  display: flex;
  align-items: center;
  gap: 6px;
  margin-bottom: 6px;
  font-weight: 500;
  font-size: 14px;
  color: var(--gray-800);
}
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.required { color: var(--danger); }

/* 知识库列表 */
.kb-list { display: flex; flex-direction: column; gap: 14px; }
.kb-item {
  background: white;
  border-radius: var(--radius);
  padding: 18px 20px;
  box-shadow: var(--shadow);
  border-left: 4px solid var(--primary);
  transition: transform 0.2s;
}
.kb-item:hover { transform: translateX(2px); }
.kb-item.disabled { opacity: 0.55; border-left-color: var(--gray-400); }
.kb-header { display: flex; gap: 12px; margin-bottom: 10px; flex-wrap: wrap; }
.kb-category {
  background: rgba(26,82,118,0.08);
  color: var(--primary);
  padding: 3px 12px;
  border-radius: 20px;
  font-size: 12px;
  font-weight: 500;
}
.kb-priority, .kb-hits { font-size: 12px; color: var(--gray-600); }
.kb-question { font-weight: 600; margin-bottom: 8px; color: var(--gray-800); }
.kb-answer { color: var(--gray-600); font-size: 14px; margin-bottom: 10px; white-space: pre-line; line-height: 1.6; }
.kb-footer { display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 10px; }
.kb-keywords { font-size: 12px; color: var(--gray-400); }
.kb-actions { display: flex; gap: 8px; }

/* 分类列表 */
.category-list { display: flex; flex-direction: column; gap: 10px; }
.category-item {
  background: white;
  border-radius: var(--radius);
  padding: 16px 20px;
  box-shadow: var(--shadow);
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: transform 0.2s;
}
.category-item:hover { transform: translateX(2px); }
.category-info { display: flex; align-items: center; gap: 14px; flex-wrap: wrap; }
.category-name { font-weight: 600; font-size: 15px; }
.category-desc { color: var(--gray-400); font-size: 13px; }
.category-count {
  background: var(--gray-100);
  padding: 3px 10px;
  border-radius: 12px;
  font-size: 12px;
  color: var(--gray-600);
  font-weight: 500;
}

/* 分页 */
.pagination { display: flex; justify-content: center; align-items: center; gap: 12px; margin-top: 24px; }
.page-info { font-size: 13px; color: var(--gray-600); }
.page-btns { display: flex; gap: 6px; }

/* 代码块 */
.code-block {
  background: var(--gray-800);
  color: #ecf0f1;
  padding: 16px 18px;
  border-radius: var(--radius-sm);
  font-family: 'Consolas', 'Monaco', monospace;
  font-size: 13px;
  overflow-x: auto;
  margin-bottom: 16px;
  line-height: 1.6;
}

/* 空状态 */
.empty-text { text-align: center; color: var(--gray-400); padding: 40px 20px; font-size: 14px; }

/* 结果文本 */
.result-text { margin-top: 15px; padding: 12px 16px; border-radius: var(--radius-sm); font-size: 14px; }
.result-text.success { background: rgba(39,174,96,0.08); color: var(--success); border: 1px solid rgba(39,174,96,0.2); }
.result-text.error { background: rgba(231,76,60,0.08); color: var(--danger); border: 1px solid rgba(231,76,60,0.2); }

/* 上传区域 */
.upload-area {
  border: 2px dashed var(--gray-200);
  border-radius: var(--radius);
  padding: 32px;
  text-align: center;
  background: var(--gray-50);
  transition: all 0.3s;
  cursor: pointer;
}
.upload-area:hover {
  border-color: var(--primary-light);
  background: rgba(41,128,185,0.03);
}
.upload-hint {
  color: var(--gray-400);
  font-size: 13px;
  margin-top: 10px;
}

/* 进度条 */
.progress-bar {
  width: 100%;
  height: 8px;
  background: var(--gray-100);
  border-radius: 4px;
  overflow: hidden;
}
.progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--primary) 0%, var(--primary-light) 100%);
  width: 0%;
  transition: width 0.3s;
  border-radius: 4px;
}
.parse-status {
  text-align: center;
  margin-top: 12px;
  color: var(--gray-600);
  font-size: 14px;
}

/* AI解析结果 */
.ai-result {
  background: linear-gradient(135deg, rgba(102,126,234,0.08) 0%, rgba(118,75,162,0.08) 100%);
  border: 1px solid rgba(102,126,234,0.25);
  border-radius: var(--radius);
  padding: 22px;
}
.ai-result h4 {
  color: #667eea;
  margin-bottom: 16px;
  display: flex;
  align-items: center;
  gap: 8px;
}
.ai-result-stats {
  display: flex;
  gap: 16px;
  margin-bottom: 16px;
  flex-wrap: wrap;
}
.ai-stat {
  background: white;
  padding: 12px 18px;
  border-radius: var(--radius-sm);
  font-size: 14px;
  box-shadow: 0 1px 4px rgba(0,0,0,0.05);
}
.ai-stat strong {
  color: var(--primary);
  font-size: 20px;
  display: block;
  margin-top: 2px;
}

/* 二维码预览 */
.qr-preview {
  margin-top: 16px;
  padding: 16px;
  background: var(--gray-50);
  border-radius: var(--radius-sm);
  text-align: center;
  border: 1px solid var(--gray-200);
}
.qr-preview-label {
  font-size: 13px;
  color: var(--gray-600);
  margin-bottom: 12px;
}
.qr-preview img {
  max-width: 200px;
  border-radius: var(--radius-sm);
  border: 2px solid var(--gray-200);
  box-shadow: 0 2px 8px rgba(0,0,0,0.08);
}

/* 模态框 */
.modal {
  position: fixed;
  top: 0; left: 0; right: 0; bottom: 0;
  background: rgba(0,0,0,0.45);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  padding: 20px;
  backdrop-filter: blur(2px);
}
.modal-content {
  background: white;
  border-radius: 16px;
  width: 100%;
  max-width: 600px;
  max-height: 90vh;
  overflow-y: auto;
  box-shadow: 0 20px 60px rgba(0,0,0,0.2);
  animation: modalIn 0.25s ease;
}
@keyframes modalIn {
  from { opacity: 0; transform: scale(0.95) translateY(10px); }
  to { opacity: 1; transform: scale(1) translateY(0); }
}
.modal-sm { max-width: 420px; }
.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 22px 24px;
  border-bottom: 1px solid var(--gray-100);
}
.modal-header h3 { font-size: 18px; font-weight: 600; }
.modal-close {
  background: none;
  border: none;
  cursor: pointer;
  color: var(--gray-400);
  padding: 4px;
  border-radius: 6px;
  transition: all 0.2s;
  display: flex;
  align-items: center;
}
.modal-close:hover { color: var(--danger); background: rgba(231,76,60,0.08); }
.modal-content form { padding: 24px; }
.modal-footer { display: flex; justify-content: flex-end; gap: 10px; margin-top: 24px; padding-top: 16px; border-top: 1px solid var(--gray-100); }

/* Toast */
.toast {
  position: fixed;
  bottom: 32px;
  left: 50%;
  transform: translateX(-50%) translateY(100px);
  padding: 12px 28px;
  border-radius: var(--radius-sm);
  color: white;
  font-size: 14px;
  font-weight: 500;
  z-index: 2000;
  transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  white-space: nowrap;
  box-shadow: 0 4px 20px rgba(0,0,0,0.15);
}
.toast.show { transform: translateX(-50%) translateY(0); }
.toast-success { background: var(--success); }
.toast-error { background: var(--danger); }

/* ===== 响应式 ===== */
@media (max-width: 768px) {
  .menu-toggle { display: flex; }
  
  .sidebar {
    position: fixed;
    left: -240px;
    top: 62px;
    bottom: 0;
    z-index: 99;
    transition: left 0.3s ease;
    width: 240px;
    box-shadow: none;
  }
  .sidebar.open {
    left: 0;
    box-shadow: 4px 0 20px rgba(0,0,0,0.1);
  }
  
  .main-content { padding: 16px; }
  .stats-grid { grid-template-columns: repeat(2, 1fr); gap: 12px; }
  .stat-card { padding: 16px; }
  .stat-number { font-size: 24px; }
  
  .filter-bar { flex-direction: column; }
  .form-select { width: 100%; }
  .form-row { grid-template-columns: 1fr; }
  
  .category-item { flex-direction: column; align-items: flex-start; gap: 12px; }
  .kb-footer { flex-direction: column; align-items: flex-start; }
}

@media (max-width: 480px) {
  .login-card { padding: 28px 24px; }
  .header-brand h2 { font-size: 15px; }
  .stats-grid { grid-template-columns: 1fr; }
  .admin-header { padding: 0 16px; }
}

/* ===== 滚动条 ===== */
::-webkit-scrollbar { width: 5px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: rgba(0,0,0,0.1); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: rgba(0,0,0,0.18); }