/* CSS变量定义 - 现代配色方案 */
:root {
  /* 基础色板 */
  --primary-50: #eef2ff;
  --primary-100: #e0e7ff;
  --primary-500: #6366f1;
  --primary-600: #4f46e5;
  --primary-700: #4338ca;
  
  --slate-50: #f8fafc;
  --slate-100: #f1f5f9;
  --slate-200: #e2e8f0;
  --slate-300: #cbd5e1;
  --slate-400: #94a3b8;
  --slate-500: #64748b;
  --slate-600: #475569;
  --slate-700: #334155;
  --slate-800: #1e293b;
  --slate-900: #0f172a;

  /* 语义化变量 (Light Mode) */
  --bg-body: var(--slate-50);
  --bg-card: #ffffff;
  --bg-sidebar: #ffffff;
  --bg-input: #ffffff;
  --bg-hover: var(--slate-50);
  
  --text-main: var(--slate-900);
  --text-secondary: var(--slate-500);
  --text-inverted: #ffffff;
  
  --border-color: var(--slate-200);
  --border-focus: var(--primary-500);
  
  --primary-color: var(--primary-600);
  --primary-hover: var(--primary-700);
  
  --success-color: #10b981;
  --warning-color: #f59e0b;
  --error-color: #ef4444;
  --error-bg: #fef2f2;
  --success-bg: #ecfdf5;
  
  /* 阴影 */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  
  --sidebar-width: 260px;
  --header-height: 64px;
  --transition-speed: 0.2s;
  --radius: 8px;
}

/* 暗黑模式变量 (Dark Mode) */
body.dark-mode {
  --bg-body: var(--slate-900);
  --bg-card: var(--slate-800);
  --bg-sidebar: var(--slate-900); /* 侧边栏与背景一致或略深 */
  --bg-input: var(--slate-900);
  --bg-hover: var(--slate-700);
  
  --text-main: var(--slate-100);
  --text-secondary: var(--slate-400);
  
  --border-color: var(--slate-700);
  
  --primary-color: var(--primary-500);
  --primary-hover: var(--primary-600);
  
  --error-bg: rgba(239, 68, 68, 0.2);
  --success-bg: rgba(16, 185, 129, 0.2);
  
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.5);
}

/* 全局重置 */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  color: var(--text-main);
  background-color: var(--bg-body);
  line-height: 1.5;
  font-size: 14px;
  transition: background-color var(--transition-speed), color var(--transition-speed);
}

/* 链接和SVG */
a { text-decoration: none; color: inherit; }
svg { flex-shrink: 0; }

/* 登录页面优化 */
.login-body {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  background: linear-gradient(135deg, #4f46e5 0%, #06b6d4 100%);
}
.dark-mode .login-body {
  background: linear-gradient(135deg, #1e1b4b 0%, #0f172a 100%);
}

.login-container {
  width: 100%;
  max-width: 400px;
  padding: 20px;
}

.login-card {
  background: var(--bg-card);
  border-radius: 16px;
  box-shadow: var(--shadow-lg);
  padding: 40px 32px;
  text-align: center;
}

.logo-area {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 64px;
  height: 64px;
  background-color: var(--primary-50);
  color: var(--primary-600);
  border-radius: 50%;
  margin-bottom: 24px;
}
.dark-mode .logo-area {
  background-color: rgba(99, 102, 241, 0.2);
  color: var(--primary-500);
}

.login-card h1 {
  font-size: 24px;
  font-weight: 700;
  margin-bottom: 8px;
  color: var(--text-main);
}

.login-subtitle {
  margin-bottom: 32px;
  color: var(--text-secondary);
}

/* 侧边栏样式 */
.sidebar {
  position: fixed;
  top: 0;
  left: 0;
  width: var(--sidebar-width);
  height: 100vh;
  background-color: var(--bg-sidebar);
  border-right: 1px solid var(--border-color);
  z-index: 50;
  transition: transform var(--transition-speed);
  display: flex;
  flex-direction: column;
}

.sidebar-header {
  height: var(--header-height);
  padding: 0 24px;
  border-bottom: 1px solid var(--border-color);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 18px;
  color: var(--primary-color);
}

.sidebar-nav {
  flex: 1;
  padding: 24px 16px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.nav-link {
  display: flex;
  align-items: center;
  padding: 10px 16px;
  color: var(--text-secondary);
  font-weight: 500;
  border-radius: var(--radius);
  transition: all var(--transition-speed);
}

.nav-link:hover {
  background-color: var(--bg-hover);
  color: var(--text-main);
}

.nav-link.active {
  background-color: var(--primary-50);
  color: var(--primary-700);
}
.dark-mode .nav-link.active {
  background-color: rgba(99, 102, 241, 0.15);
  color: var(--primary-500);
}

.nav-link svg {
  margin-right: 12px;
}

.nav-divider {
  height: 1px;
  background-color: var(--border-color);
  margin: 16px 0;
}

.danger-hover:hover {
  background-color: var(--error-bg);
  color: var(--error-color);
}

.sidebar-footer {
  padding: 20px;
  border-top: 1px solid var(--border-color);
}

/* 主题切换按钮 */
.theme-toggle {
  background: none;
  border: 1px solid var(--border-color);
  cursor: pointer;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-secondary);
  transition: all var(--transition-speed);
}
.theme-toggle:hover {
  background-color: var(--bg-hover);
  color: var(--text-main);
}

.sun-icon { display: block; }
.moon-icon { display: none; }
body.dark-mode .sun-icon { display: none; }
body.dark-mode .moon-icon { display: block; }

/* 主内容区域 */
.main-content {
  margin-left: var(--sidebar-width);
  min-height: 100vh;
  transition: margin-left var(--transition-speed);
}

.header {
  height: var(--header-height);
  padding: 0 32px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  background-color: var(--bg-body); /* 保持与背景一致或透明 */
  position: sticky;
  top: 0;
  z-index: 40;
}

.header h1 {
  font-size: 20px;
  font-weight: 600;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 16px;
}

.user-badge {
  padding: 4px 12px;
  background-color: var(--bg-card);
  border: 1px solid var(--border-color);
  border-radius: 20px;
  font-size: 12px;
  font-weight: 600;
  color: var(--text-secondary);
}

.content-area {
  padding: 32px;
  max-width: 1200px;
  margin: 0 auto;
}

.tab-content {
  display: none;
  animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(10px); }
  to { opacity: 1; transform: translateY(0); }
}

.tab-content.active {
  display: block;
}

.content-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-end;
  margin-bottom: 24px;
  flex-wrap: wrap;
  gap: 20px;
}

.title-group h2 {
  font-size: 24px;
  margin-bottom: 4px;
}
.subtitle {
  color: var(--text-secondary);
}

.header-buttons {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.btn-group {
    display: flex;
    gap: 8px;
}

/* 按钮系统 */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 8px 16px;
  border-radius: 6px;
  border: 1px solid transparent;
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  transition: all 0.2s;
  gap: 8px;
  line-height: 1.25;
}

.btn-block { width: 100%; }

.btn:active { transform: translateY(1px); }
.btn:focus { outline: none; box-shadow: 0 0 0 2px var(--border-color); }

.btn-primary {
  background-color: var(--primary-color);
  color: white;
  border-color: var(--primary-color);
  box-shadow: 0 1px 2px rgba(0,0,0,0.1);
}
.btn-primary:hover {
  background-color: var(--primary-hover);
  border-color: var(--primary-hover);
}
.btn-primary:focus { box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.3); }

.btn-outline {
  background-color: transparent;
  color: var(--text-main);
  border-color: var(--border-color);
  background-color: var(--bg-card);
}
.btn-outline:hover {
  border-color: var(--slate-400);
  background-color: var(--bg-hover);
}

.btn-success {
  background-color: var(--success-color);
  color: white;
}
.btn-success:hover { filter: brightness(90%); }

.btn-danger {
  background-color: transparent;
  color: var(--error-color);
  border-color: rgba(239, 68, 68, 0.3);
}
.btn-danger:hover {
  background-color: var(--error-bg);
  border-color: var(--error-color);
}

.btn-sm {
  padding: 6px 12px;
  font-size: 12px;
}

/* 表格容器 */
.table-container {
  background: var(--bg-card);
  border-radius: 12px;
  border: 1px solid var(--border-color);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
}

.data-table {
  width: 100%;
  border-collapse: collapse;
}

.data-table th {
  background-color: var(--slate-50);
  color: var(--text-secondary);
  font-weight: 600;
  text-transform: uppercase;
  font-size: 12px;
  letter-spacing: 0.05em;
  padding: 16px 24px;
  text-align: left;
  border-bottom: 1px solid var(--border-color);
}
.dark-mode .data-table th {
  background-color: var(--slate-800);
}

.data-table td {
  padding: 16px 24px;
  border-bottom: 1px solid var(--border-color);
  color: var(--text-main);
  vertical-align: middle;
}

.data-table tbody tr:last-child td { border-bottom: none; }

.data-table tbody tr {
    transition: background-color 0.2s;
}
.data-table tbody tr:hover {
    background-color: var(--bg-hover);
}

.actions {
  display: flex;
  gap: 8px;
}

/* 空状态 */
.empty-state {
  text-align: center;
  padding: 64px 24px;
  color: var(--text-secondary);
}
.empty-state svg {
  color: var(--slate-300);
  margin-bottom: 16px;
}
.dark-mode .empty-state svg {
  color: var(--slate-600);
}

/* 表单元素 */
.form-group { margin-bottom: 24px; }

.form-group label {
  display: block;
  margin-bottom: 8px;
  font-weight: 500;
  color: var(--text-main);
}

.form-group input,
.form-group select,
.form-group textarea {
  width: 100%;
  padding: 10px 14px;
  background-color: var(--bg-input);
  border: 1px solid var(--border-color);
  border-radius: 6px;
  color: var(--text-main);
  font-size: 14px;
  transition: all 0.2s;
}

.form-group input:focus,
.form-group select:focus,
.form-group textarea:focus {
  outline: none;
  border-color: var(--primary-color);
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

.form-group small {
  display: block;
  margin-top: 6px;
  color: var(--text-secondary);
  font-size: 12px;
}

/* 模态框 */
.modal {
  display: none;
  position: fixed;
  z-index: 1000;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.5);
  backdrop-filter: blur(2px);
}

.modal-content {
  background-color: var(--bg-card);
  margin: 80px auto;
  padding: 0;
  border-radius: 12px;
  width: 90%;
  max-width: 540px;
  box-shadow: var(--shadow-lg);
  border: 1px solid var(--border-color);
  animation: modalFadeIn 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

@keyframes modalFadeIn {
  from { opacity: 0; transform: scale(0.95); }
  to { opacity: 1; transform: scale(1); }
}

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 20px 24px;
  border-bottom: 1px solid var(--border-color);
}
.modal-header h2 { font-size: 18px; margin: 0; }

.close-btn {
  background: none;
  border: none;
  cursor: pointer;
  color: var(--text-secondary);
  padding: 4px;
  border-radius: 4px;
}
.close-btn:hover { background-color: var(--bg-hover); color: var(--text-main); }

#modalForm, #testForm { padding: 24px; }

.modal-actions {
  display: flex;
  justify-content: flex-end;
  gap: 12px;
  margin-top: 32px;
}

/* 测试结果区域 */
.test-result {
  padding: 16px 24px;
  border-top: 1px solid var(--border-color);
  background-color: var(--bg-body);
  border-bottom-left-radius: 12px;
  border-bottom-right-radius: 12px;
}
.test-result.success { color: var(--success-color); background-color: var(--success-bg); }
.test-result.error { color: var(--error-color); background-color: var(--error-bg); }

/* 加载动画 */
.spinner, .spinner-sm {
  border: 3px solid rgba(0,0,0,0.1);
  border-top-color: var(--primary-color);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}
.spinner { width: 40px; height: 40px; margin: 0 auto 16px; }
.spinner-sm { width: 16px; height: 16px; display: inline-block; border-width: 2px; }

.dark-mode .spinner { border-color: rgba(255,255,255,0.1); border-top-color: var(--primary-color); }

@keyframes spin { to { transform: rotate(360deg); } }

.loading-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(255, 255, 255, 0.8);
  display: flex;
  justify-content: center;
  align-items: center;
  z-index: 2000;
}
.dark-mode .loading-overlay { background-color: rgba(15, 23, 42, 0.8); }

.spinner-container {
  background: var(--bg-card);
  padding: 24px 40px;
  border-radius: 12px;
  box-shadow: var(--shadow-lg);
  text-align: center;
  border: 1px solid var(--border-color);
}

/* 通知 */
.notification {
  position: fixed;
  bottom: 24px;
  right: 24px;
  padding: 12px 20px;
  border-radius: 8px;
  color: white;
  font-weight: 500;
  z-index: 2001;
  opacity: 0;
  transform: translateY(20px);
  transition: all 0.3s;
  box-shadow: var(--shadow-md);
}
.notification.show { opacity: 1; transform: translateY(0); }
.notification.success { background-color: var(--success-color); }
.notification.error { background-color: var(--error-color); }
.notification.warning { background-color: var(--warning-color); }

.error-message {
  color: var(--error-color);
  margin-top: 16px;
  padding: 12px;
  background-color: var(--error-bg);
  border-radius: 6px;
  font-size: 13px;
  border: 1px solid rgba(239, 68, 68, 0.2);
}

/* 移动端菜单按钮 */
.mobile-menu-btn {
  display: none;
  position: fixed;
  top: 12px;
  left: 12px;
  z-index: 60;
  background: var(--bg-card);
  border: 1px solid var(--border-color);
  width: 40px;
  height: 40px;
  border-radius: 8px;
  box-shadow: var(--shadow-sm);
  cursor: pointer;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
}
.mobile-menu-btn span {
  width: 20px;
  height: 2px;
  background-color: var(--text-main);
  transition: 0.3s;
}
.mobile-menu-btn.active span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.mobile-menu-btn.active span:nth-child(2) { opacity: 0; }
.mobile-menu-btn.active span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* 响应式适配 */
@media (max-width: 1024px) {
  .content-area { padding: 24px; }
}

@media (max-width: 768px) {
  :root { --sidebar-width: 0px; }
  
  .sidebar { width: 260px; transform: translateX(-100%); }
  .sidebar.active { transform: translateX(0); box-shadow: 2px 0 20px rgba(0,0,0,0.2); }
  
  .main-content { margin-left: 0; }
  
  .mobile-menu-btn { display: flex; }
  .mobile-only { display: inline-flex; }
  
  .header { padding-left: 60px; padding-right: 16px; }
  
  .content-header { flex-direction: column; align-items: flex-start; gap: 16px; }
  .header-buttons { width: 100%; }
  .header-buttons .btn { flex: 1; }
  .btn-group { flex: 1; }
  
  .mobile-table-hint { display: block; padding: 8px; font-size: 12px; color: var(--text-secondary); background: var(--slate-50); text-align: center; border-bottom: 1px solid var(--border-color); }
  .dark-mode .mobile-table-hint { background: var(--slate-800); }
  
  .data-table { display: block; overflow-x: auto; white-space: nowrap; }
  .data-table th, .data-table td { padding: 12px 16px; }
  
  .modal-content { width: 95%; margin: 20px auto; }
}