:root {
  --sidebar-bg: #ffffff;
  --sidebar-hover: #f8fafc;
  --sidebar-active: #eff6ff;
  --sidebar-width: 240px;
  --header-bg: #ffffff;
  --content-bg: #f5f7fa;
  --card-bg: #ffffff;
  --card-border: #e5e7eb;
  --accent: #2563eb;
  --accent-hover: #1d4ed8;
  --accent-light: #eff6ff;
  --text-primary: #1f2937;
  --text-secondary: #6b7280;
  --text-muted: #9ca3af;
  --border-color: #e5e7eb;
  --success: #10b981;
  --danger: #ef4444;
  --warning: #f59e0b;
  --info: #3b82f6;
}
*,*::before,*::after{box-sizing:border-box}
html,body{height:100%;margin:0;padding:0;background-color:var(--content-bg);color:var(--text-primary);font-family:-apple-system,BlinkMacSystemFont,'Segoe UI','PingFang SC','Microsoft YaHei',sans-serif;font-size:14px;line-height:1.5;-webkit-font-smoothing:antialiased}
a{color:var(--accent);text-decoration:none}
a:hover{color:var(--accent-hover);text-decoration:underline}
.app-container{display:flex;min-height:100vh}
.sidebar{position:fixed;top:0;left:0;bottom:0;width:var(--sidebar-width);background-color:var(--sidebar-bg);display:flex;flex-direction:column;z-index:1000;overflow-y:auto;overflow-x:hidden;box-shadow:1px 0 3px rgba(0,0,0,0.05);transition:transform 0.3s ease}
.sidebar-header{display:flex;align-items:center;padding:18px 20px;font-size:16px;font-weight:700;color:var(--accent);border-bottom:1px solid var(--border-color);white-space:nowrap}
.sidebar-header i{font-size:20px}
.sidebar-nav{display:flex;flex-direction:column;padding:12px 0;flex:1}
.sidebar-nav a{display:flex;align-items:center;padding:12px 20px;color:var(--text-secondary);font-size:14px;font-weight:500;text-decoration:none;transition:all 0.2s ease;border-left:3px solid transparent;gap:12px}
.sidebar-nav a i{width:18px;text-align:center;font-size:16px;flex-shrink:0}
.sidebar-nav a:hover{background-color:var(--sidebar-hover);color:var(--text-primary);text-decoration:none}
.sidebar-nav a.active{background-color:var(--sidebar-active);color:var(--accent);border-left-color:var(--accent)}
.sidebar-toggle{display:none;background:none;border:none;color:var(--text-primary);font-size:20px;cursor:pointer;padding:4px 8px}
.sidebar-overlay{display:none;position:fixed;top:0;left:0;right:0;bottom:0;background-color:rgba(0,0,0,0.5);z-index:999}
.topbar{position:fixed;top:0;left:var(--sidebar-width);right:0;height:56px;background-color:var(--header-bg);border-bottom:1px solid var(--border-color);display:flex;align-items:center;justify-content:space-between;padding:0 24px;z-index:100}
.topbar-left{display:flex;align-items:center;gap:12px}
.breadcrumb-text{color:var(--text-secondary);font-size:14px}
.admin-dropdown{position:relative}
.admin-dropdown-btn{display:flex;align-items:center;gap:8px;background:none;border:1px solid var(--border-color);border-radius:6px;color:var(--text-primary);padding:6px 14px;font-size:14px;cursor:pointer}
.admin-dropdown-btn:hover{background-color:var(--sidebar-hover)}
.admin-dropdown-btn i.fa-user-circle{font-size:20px;color:var(--accent)}
.admin-dropdown-menu{display:none;position:absolute;top:100%;right:0;margin-top:6px;min-width:180px;background-color:var(--sidebar-bg);border:1px solid var(--border-color);border-radius:8px;box-shadow:0 4px 16px rgba(0,0,0,0.1);z-index:1100;overflow:hidden}
.admin-dropdown-menu.show{display:block}
.admin-dropdown-menu a{display:block;padding:10px 20px;color:var(--text-primary);font-size:14px;text-decoration:none}
.admin-dropdown-menu a:hover{background-color:var(--sidebar-hover);color:var(--accent)}
.admin-dropdown-menu a i{margin-right:8px;width:16px;text-align:center}
.admin-dropdown-menu hr{margin:4px 0;border-color:var(--border-color)}
.main-content{margin-left:var(--sidebar-width);display:flex;flex-direction:column;flex:1;min-height:100vh}
.content{margin-top:56px;padding:24px;background-color:var(--content-bg);flex:1}
.card{background-color:var(--card-bg);border:1px solid var(--card-border);border-radius:8px;box-shadow:0 1px 3px rgba(0,0,0,0.06),0 1px 2px rgba(0,0,0,0.04);margin-bottom:20px}
.card-header{background-color:#f9fafb;border-bottom:1px solid var(--card-border);padding:14px 20px;font-weight:600;color:var(--text-primary);border-radius:8px 8px 0 0!important}
.card-body{padding:20px}
.table{color:var(--text-primary);margin-bottom:0;border-collapse:separate;border-spacing:0}
.table thead th{background-color:#f9fafb;color:var(--text-primary);font-weight:600;font-size:13px;padding:12px 16px;border-bottom:1px solid var(--border-color);white-space:nowrap}
.table tbody td{padding:12px 16px;border-bottom:1px solid var(--border-color);vertical-align:middle}
.table tbody tr:nth-child(even){background-color:#f9fafb}
.table tbody tr:hover{background-color:#f3f4f6}
.table-wrapper{background-color:var(--card-bg);border:1px solid var(--card-border);border-radius:8px;overflow:hidden}
.table-wrapper .table{margin-bottom:0}
.btn{font-size:14px;padding:8px 18px;border-radius:6px;border:1px solid var(--border-color);font-weight:500;transition:all 0.2s ease;cursor:pointer;display:inline-flex;align-items:center;gap:6px}
.btn-primary{background-color:var(--accent);border-color:var(--accent);color:#fff}
.btn-primary:hover{background-color:var(--accent-hover);border-color:var(--accent-hover);color:#fff}
.btn-success{background-color:var(--success);border-color:var(--success);color:#fff}
.btn-danger{background-color:var(--danger);border-color:var(--danger);color:#fff}
.btn-warning{background-color:var(--warning);border-color:var(--warning);color:#fff}
.btn-outline-accent{background:transparent;border-color:var(--accent);color:var(--accent)}
.btn-outline-accent:hover{background-color:var(--accent);color:#fff}
.btn-sm{font-size:12px;padding:5px 12px}
.form-label{color:var(--text-secondary);font-size:13px;font-weight:500;margin-bottom:6px}
.form-control,.form-select{background-color:#fff;border:1px solid var(--border-color);border-radius:6px;color:var(--text-primary);padding:9px 14px;font-size:14px}
.form-control:focus,.form-select:focus{background-color:#fff;border-color:var(--accent);color:var(--text-primary);box-shadow:0 0 0 3px rgba(37,99,235,0.15);outline:none}
.form-check-input{background-color:#fff;border:1px solid var(--border-color);border-radius:3px}
.form-check-input:checked{background-color:var(--accent);border-color:var(--accent)}
.badge{font-size:12px;font-weight:500;padding:3px 10px;border-radius:12px}
.badge-success{background-color:rgba(16,185,129,0.1);color:#059669;border:1px solid rgba(16,185,129,0.3)}
.badge-danger{background-color:rgba(239,68,68,0.1);color:#dc2626;border:1px solid rgba(239,68,68,0.3)}
.pagination{display:flex;align-items:center;gap:4px;padding:16px 0;justify-content:center}
.page-link{display:flex;align-items:center;justify-content:center;min-width:36px;height:36px;padding:4px 10px;border:1px solid var(--border-color);border-radius:6px;color:var(--text-secondary);font-size:13px;text-decoration:none}
.page-link:hover{background-color:var(--sidebar-hover);border-color:var(--accent);color:var(--accent)}
.page-item.active .page-link{background-color:var(--accent);border-color:var(--accent);color:#fff;font-weight:600}
.alert{border:1px solid;border-radius:8px;padding:14px 18px;font-size:14px;margin-bottom:16px}
.alert-success{background-color:#ecfdf5;border-color:#10b981;color:#065f46}
.alert-danger{background-color:#fef2f2;border-color:#ef4444;color:#991b1b}
.alert-warning{background-color:#fffbeb;border-color:#f59e0b;color:#92400e}
.alert-info{background-color:#eff6ff;border-color:#3b82f6;color:#1e40af}
@media(max-width:768px){
.sidebar{transform:translateX(-100%)}
.sidebar.show{transform:translateX(0)}
.sidebar-overlay.show{display:block}
.topbar{left:0}
.main-content{margin-left:0}
.sidebar-toggle{display:inline-flex}
.content{padding:16px}
.content-footer{text-align:center;padding:12px 24px;font-size:12px;color:var(--text-muted);border-top:1px solid var(--border-color)}
.content-footer a{color:var(--text-muted)}
.content-footer a:hover{color:var(--accent)}
}