/* ==================== 后台管理系统通用样式 ==================== */
:root {
    --admin-sidebar-width: 240px;
    --admin-sidebar-collapsed-width: 64px;
    --admin-header-height: 60px;
    --admin-primary: #0d6efd;
    --admin-primary-dark: #0b5ed7;
    --admin-success: #198754;
    --admin-warning: #ffc107;
    --admin-danger:  #dc3545;
    --admin-info:    #0dcaf0;
    --admin-bg:      #f5f7fa;
    --admin-sidebar-bg: #1f2937;
    --admin-sidebar-hover: #374151;
    --admin-sidebar-active: #0d6efd;
    --admin-border: #e5e7eb;
    --admin-text:    #374151;
    --admin-text-light: #9ca3af;
}

* { box-sizing: border-box; }

body.admin-body {
    font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", "Helvetica Neue", sans-serif;
    background: var(--admin-bg);
    color: var(--admin-text);
    margin: 0;
    min-height: 100vh;
    overflow-x: hidden;
}

a { text-decoration: none; }

/* ============ 侧边栏 ============ */
.admin-sidebar {
    position: fixed;
    left: 0; top: 0;
    width: var(--admin-sidebar-width);
    height: 100vh;
    background: var(--admin-sidebar-bg);
    color: #e5e7eb;
    z-index: 1030;
    transition: all .25s ease;
    display: flex;
    flex-direction: column;
    overflow-y: auto;
    overflow-x: hidden;
}

.admin-sidebar .brand {
    height: var(--admin-header-height);
    display: flex;
    align-items: center;
    padding: 0 20px;
    font-size: 18px;
    font-weight: 600;
    color: #fff;
    border-bottom: 1px solid rgba(255,255,255,.08);
    white-space: nowrap;
}
.admin-sidebar .brand i { color: var(--admin-primary); margin-right: 10px; font-size: 22px; }

.admin-sidebar .menu {
    flex: 1;
    list-style: none;
    padding: 12px 0;
    margin: 0;
}

.admin-sidebar .menu .menu-title {
    font-size: 12px;
    color: var(--admin-text-light);
    text-transform: uppercase;
    padding: 12px 20px 6px;
    letter-spacing: .5px;
    white-space: nowrap;
}

.admin-sidebar .menu li a {
    display: flex;
    align-items: center;
    padding: 11px 20px;
    color: #d1d5db;
    font-size: 14px;
    white-space: nowrap;
    border-left: 3px solid transparent;
    transition: all .2s;
}
.admin-sidebar .menu li a i {
    width: 20px;
    margin-right: 12px;
    text-align: center;
    font-size: 15px;
}
.admin-sidebar .menu li a:hover {
    background: var(--admin-sidebar-hover);
    color: #fff;
}
.admin-sidebar .menu li a.active {
    background: var(--admin-sidebar-active);
    color: #fff;
    border-left-color: #fff;
}

/* ============ 顶部栏 ============ */
.admin-main {
    margin-left: var(--admin-sidebar-width);
    min-height: 100vh;
    transition: all .25s ease;
}

.admin-header {
    position: sticky;
    top: 0;
    height: var(--admin-header-height);
    background: #fff;
    border-bottom: 1px solid var(--admin-border);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 24px;
    z-index: 1020;
    box-shadow: 0 1px 3px rgba(0,0,0,.04);
}

.admin-header .sidebar-toggle {
    background: none;
    border: none;
    font-size: 20px;
    color: var(--admin-text);
    cursor: pointer;
    padding: 6px 10px;
    border-radius: 6px;
}
.admin-header .sidebar-toggle:hover { background: var(--admin-bg); }

.admin-header .breadcrumb {
    margin: 0 0 0 16px;
    font-size: 14px;
    color: var(--admin-text-light);
}
.admin-header .breadcrumb .current { color: var(--admin-text); font-weight: 500; }

.admin-header .user-info {
    display: flex;
    align-items: center;
    gap: 14px;
}
.admin-header .user-info .avatar {
    width: 36px; height: 36px;
    border-radius: 50%;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: #fff;
    display: flex; align-items: center; justify-content: center;
    font-weight: 600;
}
.admin-header .user-info .user-name { font-size: 14px; color: var(--admin-text); }
.admin-header .user-info .logout-btn {
    color: var(--admin-danger);
    font-size: 14px;
    padding: 4px 10px;
    border-radius: 4px;
    transition: background .2s;
}
.admin-header .user-info .logout-btn:hover { background: #fef2f2; }

/* ============ 内容区 ============ */
.admin-content {
    padding: 24px;
}

.page-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 20px;
    flex-wrap: wrap;
    gap: 12px;
}
.page-header h1 {
    font-size: 20px;
    font-weight: 600;
    margin: 0;
    color: #1f2937;
}
.page-header .actions { display: flex; gap: 8px; flex-wrap: wrap; }

/* ============ 卡片 ============ */
.card {
    background: #fff;
    border-radius: 8px;
    box-shadow: 0 1px 3px rgba(0,0,0,.06);
    border: none;
    margin-bottom: 20px;
}
.card .card-header {
    padding: 14px 20px;
    border-bottom: 1px solid var(--admin-border);
    font-weight: 600;
    font-size: 15px;
    background: transparent;
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.card .card-body { padding: 20px; }

/* ============ 统计卡片 ============ */
.stat-cards {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
    gap: 16px;
    margin-bottom: 24px;
}
.stat-card {
    background: #fff;
    border-radius: 8px;
    padding: 20px;
    display: flex;
    align-items: center;
    gap: 16px;
    box-shadow: 0 1px 3px rgba(0,0,0,.06);
}
.stat-card .stat-icon {
    width: 56px; height: 56px;
    border-radius: 10px;
    display: flex; align-items: center; justify-content: center;
    font-size: 24px;
    color: #fff;
    flex-shrink: 0;
}
.stat-card .stat-icon.blue   { background: linear-gradient(135deg, #667eea, #4e73df); }
.stat-card .stat-icon.green  { background: linear-gradient(135deg, #11998e, #38ef7d); }
.stat-card .stat-icon.orange { background: linear-gradient(135deg, #f093fb, #f5576c); }
.stat-card .stat-icon.red    { background: linear-gradient(135deg, #fa709a, #fee140); color:#a30000;}
.stat-card .stat-info .stat-num { font-size: 26px; font-weight: 700; color: #1f2937; line-height: 1.2; }
.stat-card .stat-info .stat-label { font-size: 13px; color: var(--admin-text-light); margin-top: 4px; }

/* ============ 表格 ============ */
.table-admin { width: 100%; border-collapse: collapse; }
.table-admin th, .table-admin td {
    padding: 12px 14px;
    text-align: left;
    border-bottom: 1px solid var(--admin-border);
    font-size: 14px;
    vertical-align: middle;
}
.table-admin th { background: #f9fafb; font-weight: 600; color: #4b5563; white-space: nowrap; }
.table-admin tr:hover td { background: #f9fafb; }
.table-admin .thumb {
    width: 60px; height: 44px;
    object-fit: cover;
    border-radius: 4px;
    background: #e5e7eb;
}
.table-admin .btn-sm { padding: 3px 10px; font-size: 12px; }

/* ============ 状态标签 ============ */
.status-badge {
    display: inline-block;
    padding: 2px 10px;
    border-radius: 10px;
    font-size: 12px;
}
.status-badge.on  { background: #d1fae5; color: #065f46; }
.status-badge.off { background: #fee2e2; color: #991b1b; }
.status-badge.unread { background: #fef3c7; color: #92400e; }

/* ============ 表单 ============ */
.form-group { margin-bottom: 18px; }
.form-group label {
    display: block;
    font-size: 14px;
    font-weight: 500;
    color: #374151;
    margin-bottom: 6px;
}
.form-group label .required { color: var(--admin-danger); margin-left: 2px; }
.form-control {
    width: 100%;
    padding: 8px 12px;
    border: 1px solid #d1d5db;
    border-radius: 6px;
    font-size: 14px;
    transition: border-color .2s, box-shadow .2s;
}
.form-control:focus {
    outline: none;
    border-color: var(--admin-primary);
    box-shadow: 0 0 0 3px rgba(13,110,253,.15);
}
textarea.form-control { min-height: 100px; resize: vertical; }
.form-hint { font-size: 12px; color: var(--admin-text-light); margin-top: 4px; }

.form-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 16px;
}
.form-grid .full { grid-column: 1 / -1; }

/* ============ 按钮 ============ */
.btn {
    display: inline-flex;
    align-items: center;
    gap: 5px;
    padding: 7px 16px;
    border-radius: 6px;
    font-size: 14px;
    font-weight: 500;
    border: 1px solid transparent;
    cursor: pointer;
    transition: all .2s;
    text-decoration: none;
}
.btn-primary   { background: var(--admin-primary); color: #fff; }
.btn-primary:hover   { background: var(--admin-primary-dark); color: #fff; }
.btn-success   { background: var(--admin-success); color: #fff; }
.btn-success:hover   { background: #157347; color: #fff; }
.btn-danger    { background: var(--admin-danger); color: #fff; }
.btn-danger:hover    { background: #bb2d3b; color: #fff; }
.btn-warning   { background: var(--admin-warning); color: #212529; }
.btn-secondary { background: #6c757d; color: #fff; }
.btn-secondary:hover { background: #5c636a; color: #fff; }
.btn-outline   { background: #fff; border-color: #d1d5db; color: var(--admin-text); }
.btn-outline:hover   { background: #f3f4f6; color: var(--admin-text); }
.btn-sm { padding: 3px 10px; font-size: 12px; }

/* ============ 图片上传预览 ============ */
.upload-area {
    border: 2px dashed #d1d5db;
    border-radius: 8px;
    padding: 24px;
    text-align: center;
    cursor: pointer;
    transition: all .2s;
    background: #fafbfc;
}
.upload-area:hover { border-color: var(--admin-primary); background: #eff6ff; }
.upload-area i { font-size: 36px; color: #9ca3af; margin-bottom: 8px; }
.upload-area p { margin: 0; font-size: 14px; color: #6b7280; }
.upload-preview { margin-top: 12px; position: relative; display: inline-block; }
.upload-preview img { max-width: 200px; max-height: 150px; border-radius: 6px; border: 1px solid var(--admin-border); }
.upload-preview .remove-btn {
    position: absolute; top: -8px; right: -8px;
    width: 24px; height: 24px;
    border-radius: 50%;
    background: var(--admin-danger); color: #fff;
    border: none; cursor: pointer;
    font-size: 12px;
    display: flex; align-items: center; justify-content: center;
}

/* ============ 消息提示 ============ */
.flash-messages { padding: 0 24px; margin-top: 16px; }
.alert {
    padding: 12px 16px;
    border-radius: 6px;
    margin-bottom: 12px;
    font-size: 14px;
    display: flex;
    align-items: center;
    gap: 8px;
}
.alert-success { background: #d1fae5; color: #065f46; border: 1px solid #a7f3d0; }
.alert-danger  { background: #fee2e2; color: #991b1b; border: 1px solid #fecaca; }
.alert-warning { background: #fef3c7; color: #92400e; border: 1px solid #fde68a; }

/* ============ 登录页 ============ */
.login-wrap {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    padding: 20px;
}
.login-box {
    background: #fff;
    border-radius: 12px;
    box-shadow: 0 20px 60px rgba(0,0,0,.2);
    padding: 40px;
    width: 100%;
    max-width: 400px;
}
.login-box .login-logo { text-align: center; margin-bottom: 28px; }
.login-box .login-logo i { font-size: 48px; color: var(--admin-primary); }
.login-box h2 { text-align: center; font-size: 22px; margin: 0 0 8px; color: #1f2937; }
.login-box .subtitle { text-align: center; color: var(--admin-text-light); font-size: 14px; margin-bottom: 28px; }
.login-box .form-group { margin-bottom: 18px; }
.login-box .btn-block { width: 100%; justify-content: center; padding: 10px; font-size: 15px; margin-top: 8px; }
.login-box .remember-row {
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: 13px;
}
.login-box .back-site {
    text-align: center;
    margin-top: 20px;
    font-size: 13px;
}
.login-box .back-site a { color: var(--admin-primary); }

/* ============ 分页 ============ */
.pagination-wrap {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-top: 20px;
    padding-top: 16px;
    border-top: 1px solid var(--admin-border);
    font-size: 14px;
    flex-wrap: wrap;
    gap: 10px;
}
.pagination { display: flex; gap: 4px; list-style: none; padding: 0; margin: 0; }
.pagination li a, .pagination li span {
    display: inline-block;
    padding: 6px 12px;
    border: 1px solid var(--admin-border);
    border-radius: 4px;
    color: var(--admin-text);
    font-size: 13px;
}
.pagination li.active span { background: var(--admin-primary); color: #fff; border-color: var(--admin-primary); }
.pagination li a:hover { background: #f3f4f6; }

/* ============ 空状态 ============ */
.empty-state {
    text-align: center;
    padding: 60px 20px;
    color: var(--admin-text-light);
}
.empty-state i { font-size: 56px; margin-bottom: 16px; color: #d1d5db; }
.empty-state p { font-size: 15px; margin: 0 0 16px; }

/* ============ 操作栏 ============ */
.action-bar {
    display: flex;
    gap: 8px;
    margin-bottom: 16px;
    flex-wrap: wrap;
    align-items: center;
}
.action-bar .search-input {
    width: 240px;
    padding: 7px 12px;
    border: 1px solid var(--admin-border);
    border-radius: 6px;
    font-size: 14px;
}
.action-bar select.form-control-sm {
    padding: 7px 10px;
    border: 1px solid var(--admin-border);
    border-radius: 6px;
    font-size: 14px;
}

/* ============ 手机端适配 ============ */
.mobile-toggle { display: none; }
@media (max-width: 768px) {
    .admin-sidebar {
        transform: translateX(-100%);
        width: 240px;
    }
    .admin-sidebar.show { transform: translateX(0); box-shadow: 2px 0 10px rgba(0,0,0,.2); }
    .admin-main { margin-left: 0; }
    .mobile-toggle { display: block; }
    .admin-content { padding: 16px; }
    .admin-header { padding: 0 16px; }
    .admin-header .breadcrumb { display: none; }
    .admin-header .user-info .user-name { display: none; }
    .form-grid { grid-template-columns: 1fr; }
    .stat-cards { grid-template-columns: repeat(2, 1fr); gap: 10px; }
    .stat-card { padding: 14px; }
    .stat-card .stat-icon { width: 44px; height: 44px; font-size: 20px; }
    .stat-card .stat-info .stat-num { font-size: 20px; }
    .table-admin th:nth-child(n+4), .table-admin td:nth-child(n+4) { display: none; }
    .page-header h1 { font-size: 18px; }
    .action-bar .search-input { width: 100%; }
    .login-box { padding: 28px 20px; }
    .sidebar-overlay {
        display: none;
        position: fixed;
        inset: 0;
        background: rgba(0,0,0,.4);
        z-index: 1025;
    }
    .sidebar-overlay.show { display: block; }
}