*{box-sizing:border-box;margin:0;padding:0}:root{--bg-primary:#0f172a;--bg-secondary:#1e293b;--bg-card:#1e293b;--bg-card-hover:#263348;--border:#334155;--text-primary:#f1f5f9;--text-secondary:#94a3b8;--text-muted:#64748b;--blue:#3b82f6;--green:#22c55e;--yellow:#f59e0b;--red:#ef4444;--purple:#8b5cf6;--pink:#ec4899}body{background:var(--bg-primary);color:var(--text-primary);-webkit-font-smoothing:antialiased;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif;line-height:1.6}#root{text-align:left;border:none;width:100%;max-width:100%;min-height:100vh;margin:0}.app{min-height:100vh}.loading-screen,.error-screen{flex-direction:column;justify-content:center;align-items:center;gap:16px;min-height:100vh;display:flex}.error-screen h2{color:var(--red)}.error-hint{color:var(--text-muted);font-size:14px}.spinner{border:3px solid var(--border);border-top-color:var(--blue);border-radius:50%;width:40px;height:40px;animation:.8s linear infinite spin}@keyframes spin{to{transform:rotate(360deg)}}.nav-bar{background:var(--bg-secondary);border-bottom:1px solid var(--border);z-index:100;align-items:center;gap:24px;padding:12px 24px;display:flex;position:sticky;top:0}.nav-brand{white-space:nowrap;font-size:18px;font-weight:700}.nav-tabs{gap:4px;display:flex}.nav-btn{color:var(--text-secondary);cursor:pointer;background:0 0;border:none;border-radius:6px;padding:6px 16px;font-size:14px;transition:all .2s}.nav-btn:hover{background:var(--bg-card-hover);color:var(--text-primary)}.nav-btn.active{background:var(--blue);color:#fff}.nav-user{color:var(--text-secondary);margin-left:auto;font-size:13px}.main-content{max-width:1200px;margin:0 auto;padding:24px}.dash-header{margin-bottom:24px}.dash-header h1{font-size:24px;font-weight:700}.subtitle{color:var(--text-secondary);margin-top:4px;font-size:14px}.kpi-grid{grid-template-columns:repeat(auto-fill,minmax(150px,1fr));gap:12px;margin-bottom:24px;display:grid}.kpi-card{background:var(--bg-card);border:1px 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18px;transition:all .2s;display:flex}.activity-card:hover{background:var(--bg-card-hover);border-color:var(--blue)}.act-card-date{color:var(--text-muted);font-size:12px}.act-card-name{margin:2px 0;font-size:15px;font-weight:600}.act-card-meta{color:var(--text-secondary);font-size:12px}.act-card-right{gap:16px;display:flex}.act-card-stat{flex-direction:column;align-items:center;gap:2px;display:flex}.stat-label{color:var(--text-muted);text-transform:uppercase;font-size:10px}.stat-value{font-size:15px;font-weight:700}.activity-detail{max-width:1200px;margin:0 auto;padding:24px}.back-btn{border:1px solid var(--border);color:var(--text-secondary);cursor:pointer;background:0 0;border-radius:6px;margin-bottom:16px;padding:6px 14px;font-size:13px;transition:all .2s}.back-btn:hover{border-color:var(--blue);color:var(--text-primary)}.activity-detail 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.2s}.filter-btn:hover{border-color:var(--blue);color:var(--text-primary)}.filter-btn.active{background:var(--blue);color:#fff;border-color:var(--blue)}.tag{vertical-align:middle;border-radius:3px;margin-right:4px;padding:1px 5px;font-size:10px;font-weight:700;display:inline-block}.tag-race{color:#fff;background:#ef4444}.tag-trainer{color:#fff;background:#6366f1}.info-banner{color:var(--text-secondary);background:#1e3a5f;border:1px solid #2563eb40;border-radius:10px;align-items:flex-start;gap:10px;margin-bottom:16px;padding:14px 18px;font-size:13px;line-height:1.6;display:flex}.info-icon{flex-shrink:0;font-size:18px}.strava-badge{color:#fff;vertical-align:middle;background:#fc4c02;border-radius:3px;margin-right:6px;padding:1px 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.15s}.kpi-card:hover{transform:translateY(-2px);box-shadow:0 4px 12px #0000004d}.chart-section{transition:box-shadow .15s}.chart-section:hover{box-shadow:0 2px 8px #0003}.insight-card{transition:transform .15s}.insight-card:hover{transform:translate(4px)}.recharts-default-tooltip{background:var(--bg-secondary)!important;border:1px solid var(--border)!important;border-radius:8px!important}@media (width<=640px){.main-content{padding:16px}.kpi-grid{grid-template-columns:repeat(2,1fr)}.kpi-value{font-size:22px}.act-card-right{gap:10px}.nav-bar{padding:10px 16px}.activity-detail{padding:16px}}