*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}:root{--primary: #2563eb;--primary-dark: #1d4ed8;--primary-light: #eff6ff;--success: #10b981;--success-light: #ecfdf5;--warning: #f59e0b;--warning-light: #fffbeb;--danger: #ef4444;--danger-light: #fef2f2;--info: #06b6d4;--info-light: #ecfeff;--sidebar-bg: #0f172a;--sidebar-text: #94a3b8;--sidebar-active: #2563eb;--sidebar-hover: #1e293b;--sidebar-width: 260px;--bg: #f1f5f9;--surface: #ffffff;--border: #e2e8f0;--text: #1e293b;--text-muted: #64748b;--radius: 8px;--radius-lg: 12px;--shadow: 0 1px 3px rgba(0,0,0,.1), 0 1px 2px rgba(0,0,0,.06);--shadow-md: 0 4px 6px -1px rgba(0,0,0,.1), 0 2px 4px -1px rgba(0,0,0,.06)}body{font-family:-apple-system,BlinkMacSystemFont,Segoe 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.15s}.btn-logout:hover{background:#334155;color:#f1f5f9}.main-content{margin-left:var(--sidebar-width);flex:1;display:flex;flex-direction:column;min-height:100vh}.topbar{background:var(--surface);border-bottom:1px solid var(--border);padding:16px 28px;display:flex;align-items:center;justify-content:space-between;position:sticky;top:0;z-index:50}.topbar-title{font-size:18px;font-weight:600}.topbar-subtitle{font-size:13px;color:var(--text-muted);margin-top:2px}.page-content{padding:28px;flex:1}.card{background:var(--surface);border-radius:var(--radius-lg);box-shadow:var(--shadow);border:1px solid var(--border)}.card-header{padding:20px 24px 16px;border-bottom:1px solid 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var(--border);box-shadow:var(--shadow);display:flex;align-items:center;gap:16px}.stat-icon{width:48px;height:48px;border-radius:var(--radius);display:flex;align-items:center;justify-content:center;font-size:22px;flex-shrink:0}.stat-icon.blue{background:var(--primary-light)}.stat-icon.green{background:var(--success-light)}.stat-icon.yellow{background:var(--warning-light)}.stat-icon.red{background:var(--danger-light)}.stat-icon.cyan{background:var(--info-light)}.stat-value{font-size:24px;font-weight:700;line-height:1}.stat-label{font-size:13px;color:var(--text-muted);margin-top:4px}.btn{display:inline-flex;align-items:center;gap:6px;padding:8px 16px;border-radius:var(--radius);font-size:14px;font-weight:500;cursor:pointer;border:none;transition:all 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