*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}:root{--bg: #f5f5f5;--surface: #ffffff;--border: #e0e0e0;--text: #1a1a1a;--text-muted: #666666;--primary: #2563eb;--primary-hover: #1d4ed8;--danger: #dc2626;--danger-hover: #b91c1c;--success: #16a34a;--radius: 6px;--shadow: 0 1px 3px rgba(0,0,0,.1)}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif;background:var(--bg);color:var(--text);font-size:14px;line-height:1.5}a{color:var(--primary);text-decoration:none}a:hover{text-decoration:underline}.layout{display:flex;min-height:100vh}.sidebar{width:220px;background:var(--surface);border-right:1px solid var(--border);padding:24px 0;flex-shrink:0}.sidebar-title{font-size:16px;font-weight:700;padding:0 20px 20px;border-bottom:1px solid var(--border);margin-bottom:8px}.sidebar nav{display:flex;flex-direction:column}.sidebar nav a{padding:10px 20px;color:var(--text);font-weight:500;border-left:3px solid transparent;transition:background .15s}.sidebar nav a:hover{background:var(--bg);text-decoration:none}.sidebar nav a.active{border-left-color:var(--primary);color:var(--primary);background:#eff6ff}.sidebar-footer{padding:20px;margin-top:auto;border-top:1px solid var(--border)}.main-content{flex:1;padding:32px;overflow-y:auto}.page-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:24px}.page-header h1{font-size:22px;font-weight:700}.card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:24px;box-shadow:var(--shadow)}.stats-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(160px,1fr));gap:16px;margin-bottom:32px}.stat-card{background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:20px;box-shadow:var(--shadow)}.stat-card .stat-label{font-size:12px;color:var(--text-muted);text-transform:uppercase;letter-spacing:.05em;margin-bottom:8px}.stat-card 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