/* 基础变量 */
:root {
    --primary: #4F46E5;
    --primary-dark: #4338CA;
    --primary-light: #818CF8;
    --secondary: #10B981;
    --danger: #EF4444;
    --warning: #F59E0B;
    --info: #3B82F6;
    --dark: #1E293B;
    --dark-sidebar: #1E1E2E;
    --gray: #6B7280;
    --gray-light: #9CA3AF;
    --bg: #F3F4F6;
    --white: #FFFFFF;
    --border: #E5E7EB;
    --shadow: 0 1px 3px rgba(0,0,0,0.1);
    --shadow-lg: 0 4px 6px rgba(0,0,0,0.1);
    --radius: 8px;
    --radius-lg: 12px;
    --sidebar-width: 260px;
    --sidebar-collapsed: 70px;
    --header-height: 64px;
    --transition: all 0.3s ease;
}

/* 重置样式 */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { font-size: 16px; }
body { font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif; line-height: 1.6; color: var(--dark); background: var(--bg); min-height: 100vh; overflow-x: hidden; }
a { text-decoration: none; color: inherit; }
button { border: none; background: none; cursor: pointer; font-family: inherit; }
input, textarea, select { font-family: inherit; font-size: inherit; }
img { max-width: 100%; height: auto; }

/* 滚动条 */
::-webkit-scrollbar { width: 6px; height: 6px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: var(--gray-light); border-radius: 3px; }
::-webkit-scrollbar-thumb:hover { background: var(--gray); }

/* 应用容器 */
#app { min-height: 100vh; }

/* 登录页面 */
.login-page { display: flex; align-items: center; justify-content: center; min-height: 100vh; background: linear-gradient(135deg, #667eea 0%, #764ba2 100%); padding: 20px; }
.login-container { background: var(--white); border-radius: var(--radius-lg); box-shadow: var(--shadow-lg); padding: 40px; width: 100%; max-width: 400px; }
.login-header { text-align: center; margin-bottom: 30px; }
.login-logo { width: 80px; height: 80px; background: var(--primary); border-radius: 50%; display: flex; align-items: center; justify-content: center; margin: 0 auto 15px; }
.login-logo i { font-size: 40px; color: white; }
.login-header h1 { font-size: 24px; color: var(--dark); margin-bottom: 5px; }
.login-header p { color: var(--gray); font-size: 14px; }
.login-form .form-group { margin-bottom: 20px; }
.login-form label { display: block; font-size: 14px; font-weight: 500; color: var(--dark); margin-bottom: 8px; }
.login-form label i { margin-right: 5px; color: var(--gray); }
.login-form input { width: 100%; padding: 12px 15px; border: 1px solid var(--border); border-radius: var(--radius); font-size: 14px; transition: var(--transition); }
.login-form input:focus { outline: none; border-color: var(--primary); box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1); }
.password-input { position: relative; }
.password-input input { padding-right: 40px; }
.toggle-password { position: absolute; right: 10px; top: 50%; transform: translateY(-50%); color: var(--gray); padding: 5px; }
.toggle-password:hover { color: var(--primary); }
.security-box { background: var(--bg); padding: 10px; border-radius: var(--radius); margin-bottom: 10px; text-align: center; }
.security-box span { font-family: monospace; font-size: 18px; letter-spacing: 4px; color: var(--primary); font-weight: bold; }
.login-form input[type="text"] { letter-spacing: 2px; text-transform: uppercase; }
.btn-login { width: 100%; padding: 14px; background: var(--primary); color: white; border-radius: var(--radius); font-size: 16px; font-weight: 600; transition: var(--transition); position: relative; }
.btn-login:hover { background: var(--primary-dark); }
.btn-login.loading .btn-text { visibility: hidden; }
.btn-login.loading .btn-loader { display: block; }
.btn-loader { display: none; position: absolute; top: 50%; left: 50%; transform: translate(-50%, -50%); }
.login-error { color: var(--danger); font-size: 14px; text-align: center; margin-top: 15px; min-height: 20px; }
.login-footer { margin-top: 20px; padding-top: 20px; border-top: 1px solid var(--border); text-align: center; }
.login-footer p { color: var(--gray); font-size: 12px; margin: 5px 0; }

/* 管理后台布局 */
.admin-layout { display: flex; min-height: 100vh; }

/* 侧边栏 */
.sidebar { width: var(--sidebar-width); background: var(--dark-sidebar); color: white; position: fixed; top: 0; left: 0; bottom: 0; display: flex; flex-direction: column; transition: var(--transition); z-index: 100; }
.sidebar.collapsed { width: var(--sidebar-collapsed); }
.sidebar-header { padding: 20px; display: flex; align-items: center; justify-content: space-between; border-bottom: 1px solid rgba(255,255,255,0.1); }
.logo { display: flex; align-items: center; gap: 12px; }
.logo i { font-size: 28px; color: var(--primary-light); }
.logo-text { font-size: 20px; font-weight: 700; white-space: nowrap; }
.sidebar.collapsed .logo-text { display: none; }
.sidebar-toggle { color: var(--gray-light); font-size: 20px; padding: 5px; }
.sidebar-toggle:hover { color: white; }
.sidebar.collapsed .sidebar-toggle { display: none; }
.sidebar-nav { flex: 1; overflow-y: auto; padding: 15px 0; }
.nav-section { margin-bottom: 20px; }
.nav-section-title { padding: 8px 20px; font-size: 11px; text-transform: uppercase; letter-spacing: 1px; color: var(--gray-light); white-space: nowrap; overflow: hidden; }
.sidebar.collapsed .nav-section-title { visibility: hidden; }
.nav-item { display: flex; align-items: center; padding: 12px 20px; color: rgba(255,255,255,0.7); transition: var(--transition); gap: 12px; }
.nav-item:hover { background: rgba(255,255,255,0.1); color: white; }
.nav-item.active { background: var(--primary); color: white; }
.nav-item i { font-size: 18px; width: 20px; text-align: center; flex-shrink: 0; }
.nav-item span { white-space: nowrap; overflow: hidden; }
.sidebar.collapsed .nav-item span { display: none; }

/* 主内容区 */
.main-wrapper { flex: 1; margin-left: var(--sidebar-width); transition: var(--transition); }
.sidebar.collapsed ~ .main-wrapper { margin-left: var(--sidebar-collapsed); }
.header { height: var(--header-height); background: var(--white); border-bottom: 1px solid var(--border); display: flex; align-items: center; justify-content: space-between; padding: 0 20px; position: sticky; top: 0; z-index: 50; }
.header-left { display: flex; align-items: center; gap: 15px; }
.mobile-menu-btn { display: none; font-size: 20px; color: var(--dark); }
.page-title { font-size: 20px; font-weight: 600; color: var(--dark); }
.header-right { display: flex; align-items: center; gap: 15px; }
.header-actions { display: flex; gap: 10px; }
.header-btn { width: 40px; height: 40px; border-radius: 50%; display: flex; align-items: center; justify-content: center; color: var(--gray); position: relative; transition: var(--transition); }
.header-btn:hover { background: var(--bg); color: var(--dark); }
.header-btn .badge { position: absolute; top: 0; right: 0; width: 18px; height: 18px; background: var(--danger); color: white; font-size: 11px; border-radius: 50%; display: flex; align-items: center; justify-content: center; }
.user-dropdown { position: relative; }
.user-btn { display: flex; align-items: center; gap: 10px; padding: 5px 10px; border-radius: var(--radius); transition: var(--transition); }
.user-btn:hover { background: var(--bg); }
.user-avatar { width: 36px; height: 36px; border-radius: 50%; object-fit: cover; }
.user-name { font-size: 14px; font-weight: 500; color: var(--dark); }
.user-btn .fa-chevron-down { font-size: 12px; color: var(--gray); }
.dropdown-menu { position: absolute; top: 100%; right: 0; margin-top: 10px; background: var(--white); border-radius: var(--radius); box-shadow: var(--shadow-lg); min-width: 160px; overflow: hidden; opacity: 0; visibility: hidden; transform: translateY(-10px); transition: var(--transition); z-index: 100; }
.dropdown-menu.show { opacity: 1; visibility: visible; transform: translateY(0); }
.dropdown-menu a { display: flex; align-items: center; gap: 10px; padding: 12px 15px; color: var(--dark); font-size: 14px; transition: var(--transition); }
.dropdown-menu a:hover { background: var(--bg); }
.dropdown-menu a i { color: var(--gray); width: 20px; }
.main-content { padding: 25px; }

/* 页面头部 */
.page-header { display: flex; justify-content: space-between; align-items: center; margin-bottom: 25px; }
.page-header h2 { font-size: 24px; font-weight: 600; color: var(--dark); margin-bottom: 5px; }
.text-muted { color: var(--gray); font-size: 14px; }

/* 卡片 */
.card { background: var(--white); border-radius: var(--radius-lg); box-shadow: var(--shadow); overflow: hidden; }
.card-header { padding: 15px 20px; border-bottom: 1px solid var(--border); }
.card-header h3 { font-size: 16px; font-weight: 600; display: flex; align-items: center; gap: 8px; }
.card-header h3 i { color: var(--primary); }
.card-body { padding: 20px; }

/* 按钮 */
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; padding: 10px 20px; border-radius: var(--radius); font-size: 14px; font-weight: 500; transition: var(--transition); cursor: pointer; }
.btn-primary { background: var(--primary); color: white; }
.btn-primary:hover { background: var(--primary-dark); }
.btn-secondary { background: var(--bg); color: var(--dark); }
.btn-secondary:hover { background: var(--border); }
.btn-danger { background: var(--danger); color: white; }
.btn-danger:hover { background: #DC2626; }
.btn-success { background: var(--secondary); color: white; }
.btn-success:hover { background: #059669; }
.btn-warning { background: var(--warning); color: white; }
.btn-warning:hover { background: #D97706; }
.btn-sm { padding: 6px 12px; font-size: 12px; }
.btn-info { background: var(--info); color: white; }
.btn-info:hover { background: #2563EB; }
.btn-icon { width: 32px; height: 32px; border-radius: var(--radius); display: inline-flex; align-items: center; justify-content: center; transition: var(--transition); }
.btn-icon:hover { background: var(--bg); }
.btn-icon.btn-edit { color: var(--info); }
.btn-icon.btn-edit:hover { background: rgba(59, 130, 246, 0.1); }
.btn-icon.btn-delete { color: var(--danger); }
.btn-icon.btn-delete:hover { background: rgba(239, 68, 68, 0.1); }
.btn-icon.btn-success { color: var(--secondary); }
.btn-icon.btn-warning { color: var(--warning); }

/* 表格 */
.data-table { width: 100%; border-collapse: collapse; }
.data-table th, .data-table td { padding: 12px 15px; text-align: left; border-bottom: 1px solid var(--border); }
.data-table th { background: var(--bg); font-weight: 600; font-size: 13px; color: var(--gray); text-transform: uppercase; letter-spacing: 0.5px; }
.data-table tbody tr { transition: var(--transition); }
.data-table tbody tr:hover { background: var(--bg); }
.data-table .actions-col { width: 150px; text-align: right; }
.data-table .actions-cell { display: flex; gap: 5px; justify-content: flex-end; }
.table-img { width: 60px; height: 40px; object-fit: cover; border-radius: 4px; }
.table-avatar { width: 44px; height: 44px; object-fit: cover; border-radius: 50%; }
.table-avatar-placeholder { width: 44px; height: 44px; border-radius: 50%; background: var(--bg); display: flex; align-items: center; justify-content: center; color: var(--gray-light); }
.table-user-name { font-weight: 500; max-width: 200px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.table-user-email { font-size: 12px; color: var(--gray); margin-top: 2px; max-width: 200px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.table-empty { text-align: center; padding: 60px 20px; color: var(--gray); }
.table-empty i { font-size: 48px; margin-bottom: 15px; display: block; opacity: 0.5; }
.table-empty p { font-size: 16px; }
.user-id-code { font-size: 11px; background: var(--bg); padding: 2px 6px; border-radius: 4px; color: var(--gray); word-break: break-all; }

/* 徽章 */
.badge { display: inline-block; padding: 4px 10px; border-radius: 20px; font-size: 12px; font-weight: 500; }
.badge-success { background: rgba(16, 185, 129, 0.1); color: var(--secondary); }
.badge-danger { background: rgba(239, 68, 68, 0.1); color: var(--danger); }
.badge-warning { background: rgba(245, 158, 11, 0.1); color: var(--warning); }
.badge-info { background: rgba(59, 130, 246, 0.1); color: var(--info); }

/* 表单 */
.form { max-width: 500px; }
.form-group { margin-bottom: 20px; }
.form-group label { display: block; font-size: 14px; font-weight: 500; color: var(--dark); margin-bottom: 8px; }
.form-control { width: 100%; padding: 10px 12px; border: 1px solid var(--border); border-radius: var(--radius); font-size: 14px; transition: var(--transition); }
.form-control:focus { outline: none; border-color: var(--primary); box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1); }
textarea.form-control { resize: vertical; min-height: 80px; }
.form-row { display: grid; grid-template-columns: repeat(2, 1fr); gap: 15px; }
.form-hint { font-size: 12px; color: var(--gray); margin-top: 5px; }

/* 颜色选择器 */
.color-picker { display: flex; gap: 10px; align-items: center; }
.color-picker input[type="color"] { width: 50px; height: 38px; border: 1px solid var(--border); border-radius: var(--radius); cursor: pointer; }
.color-picker input[type="text"] { flex: 1; }
.tag-preview { display: inline-block; width: 20px; height: 20px; border-radius: 4px; vertical-align: middle; margin-right: 5px; }

/* 开关 */
.switch { position: relative; display: inline-block; width: 48px; height: 26px; }
.switch input { opacity: 0; width: 0; height: 0; }
.slider { position: absolute; cursor: pointer; top: 0; left: 0; right: 0; bottom: 0; background-color: var(--gray-light); transition: 0.3s; border-radius: 26px; }
.slider:before { position: absolute; content: ""; height: 20px; width: 20px; left: 3px; bottom: 3px; background-color: white; transition: 0.3s; border-radius: 50%; }
input:checked + .slider { background-color: var(--primary); }
input:checked + .slider:before { transform: translateX(22px); }

/* 模态框 */
.modal-overlay { position: fixed; top: 0; left: 0; right: 0; bottom: 0; background: rgba(0,0,0,0.5); display: flex; align-items: center; justify-content: center; z-index: 1000; opacity: 0; visibility: hidden; transition: var(--transition); }
.modal-overlay.active { opacity: 1; visibility: visible; }
.modal { background: var(--white); border-radius: var(--radius-lg); box-shadow: var(--shadow-lg); max-height: 90vh; overflow: hidden; display: flex; flex-direction: column; transform: scale(0.9); transition: var(--transition); }
.modal-overlay.active .modal { transform: scale(1); }
.modal-sm { width: 400px; }
.modal-md { width: 500px; }
.modal-lg { width: 700px; }
.modal-header { padding: 20px; border-bottom: 1px solid var(--border); display: flex; align-items: center; justify-content: space-between; }
.modal-title { font-size: 18px; font-weight: 600; color: var(--dark); }
.modal-close { width: 32px; height: 32px; border-radius: var(--radius); display: flex; align-items: center; justify-content: center; color: var(--gray); transition: var(--transition); }
.modal-close:hover { background: var(--bg); color: var(--dark); }
.modal-body { padding: 20px; overflow-y: auto; flex: 1; }
.modal-footer { padding: 15px 20px; border-top: 1px solid var(--border); display: flex; justify-content: flex-end; gap: 10px; }

/* 分页 */
.pagination { display: flex; align-items: center; justify-content: center; gap: 5px; margin-top: 20px; }
.pagination button { width: 36px; height: 36px; border-radius: var(--radius); display: flex; align-items: center; justify-content: center; font-size: 14px; color: var(--dark); transition: var(--transition); }
.pagination button:hover { background: var(--bg); }
.pagination button.active { background: var(--primary); color: white; }
.pagination-ellipsis { padding: 0 10px; color: var(--gray); }

/* 用户详情 */
.user-detail { display: flex; gap: 20px; }
.user-avatar-large { width: 100px; height: 100px; border-radius: 50%; overflow: hidden; flex-shrink: 0; }
.user-avatar-large img { width: 100%; height: 100%; object-fit: cover; }
.user-info-list { flex: 1; }
.info-row { display: flex; padding: 10px 0; border-bottom: 1px solid var(--border); }
.info-row:last-child { border-bottom: none; }
.info-row .label { width: 100px; color: var(--gray); font-size: 14px; }
.info-row .value { flex: 1; font-weight: 500; }

/* 文件上传 */
.file-upload { border: 2px dashed var(--border); border-radius: var(--radius); padding: 30px; text-align: center; cursor: pointer; transition: var(--transition); position: relative; }
.file-upload:hover { border-color: var(--primary); background: rgba(79, 70, 229, 0.05); }
.file-upload input[type="file"] { position: absolute; top: 0; left: 0; width: 100%; height: 100%; opacity: 0; cursor: pointer; }
.upload-placeholder i { font-size: 40px; color: var(--gray-light); margin-bottom: 10px; }
.upload-placeholder p { color: var(--gray); font-size: 14px; }

/* 预览图 */
.preview-img { max-width: 200px; max-height: 150px; border-radius: var(--radius); margin-top: 10px; }

/* 设置页面 */
.info-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 15px; }
.info-item { display: flex; justify-content: space-between; padding: 15px; background: var(--bg); border-radius: var(--radius); }
.info-label { color: var(--gray); }
.info-value { font-weight: 500; }
.input-with-unit { display: flex; align-items: center; }
.input-with-unit input { border-radius: var(--radius) 0 0 var(--radius); }
.input-with-unit .unit { padding: 10px 15px; background: var(--bg); border: 1px solid var(--border); border-left: none; border-radius: 0 var(--radius) var(--radius 0; color: var(--gray); }

/* 筛选器 */
.filter-group { display: flex; gap: 10px; }
.filter-group .form-control { width: auto; min-width: 120px; }

/* 响应式 */
@media (max-width: 1024px) {
    .sidebar { transform: translateX(-100%); }
    .sidebar.open { transform: translateX(0); }
    .main-wrapper { margin-left: 0; }
    .mobile-menu-btn { display: block; }
}
@media (max-width: 768px) {
    .page-header { flex-direction: column; align-items: flex-start; gap: 15px; }
    .form-row { grid-template-columns: 1fr; }
    .info-grid { grid-template-columns: 1fr; }
    .user-detail { flex-direction: column; }
}