*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}:root{--bg: #0f172a;--surface: #1e293b;--surface-hover: #263348;--border: #334155;--accent: #6366f1;--text: #f1f5f9;--muted: #64748b;--sidebar-w: 220px;--header-h: 56px}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif;background:var(--bg);color:var(--text);min-height:100vh}.shell{display:flex;min-height:100vh}.sidebar{width:var(--sidebar-w);background:var(--surface);border-right:1px solid var(--border);display:flex;flex-direction:column;flex-shrink:0;position:fixed;top:0;left:0;height:100vh;overflow-y:auto}.sidebar-logo{padding:20px 20px 16px;font-size:18px;font-weight:700;letter-spacing:-.5px;border-bottom:1px solid var(--border)}.sidebar-logo span{color:var(--accent)}.sidebar-nav{display:flex;flex-direction:column;gap:2px;padding:12px 8px}.nav-item{display:flex;align-items:center;gap:10px;width:100%;padding:9px 12px;background:none;border:none;border-radius:8px;color:var(--muted);font-size:14px;font-weight:500;cursor:pointer;text-align:left;transition:background .15s,color .15s}.nav-item:hover{background:var(--surface-hover);color:var(--text)}.nav-item--active{background:var(--accent);color:#fff}.nav-item--active:hover{background:var(--accent)}.nav-icon{font-size:16px;width:20px;flex-shrink:0}.main-column{margin-left:var(--sidebar-w);flex:1;display:flex;flex-direction:column;min-height:100vh}.header{height:var(--header-h);border-bottom:1px solid var(--border);display:flex;align-items:center;justify-content:space-between;padding:0 24px;flex-shrink:0;position:sticky;top:0;background:var(--bg);z-index:10}.header-title{font-size:16px;font-weight:600}.header-user{display:flex;align-items:center;gap:12px}.user-email{font-size:13px;color:var(--muted)}.btn-logout{padding:6px 14px;background:transparent;border:1px solid var(--border);border-radius:6px;color:var(--muted);font-size:13px;cursor:pointer;transition:color .15s,border-color .15s}.btn-logout:hover{color:var(--text);border-color:var(--text)}.content{flex:1;padding:28px 24px}.stats-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(180px,1fr));gap:16px;margin-bottom:32px}.stat-card{background:var(--surface);border:1px solid var(--border);border-radius:12px;padding:24px}.stat-value{font-size:32px;font-weight:700;color:var(--text);margin-bottom:6px}.stat-label{font-size:13px;color:var(--muted)}.placeholder-section{background:var(--surface);border:1px solid var(--border);border-radius:12px;padding:28px}.placeholder-section h2{font-size:15px;font-weight:600;margin-bottom:10px}.placeholder-page{max-width:480px}.placeholder-page h2{font-size:20px;font-weight:700;margin-bottom:10px}.placeholder-text{font-size:14px;color:var(--muted);line-height:1.6}