:root{--color-bg:#1a1a2e;--color-surface:#16213e;--color-surface-elevated:#1e2a4a;--color-border:#2a3a5c;--color-text:#e0e0e0;--color-text-muted:#8892a4;--color-accent:#4fc3f7;--color-accent-hover:#29b6f6;--color-primary:#4fc3f7;--color-primary-hover:#29b6f6;--color-danger:#ef5350;--color-success:#66bb6a;--color-warning:#ffa726;--panel-radius:6px;--header-height:48px;--timeline-height:220px;--sidebar-width:240px;--property-width:260px}*,:before,:after{box-sizing:border-box;margin:0;padding:0}html,body,#root{width:100%;height:100%;overflow:hidden}body{background:var(--color-bg);color:var(--color-text);font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif;font-size:14px;line-height:1.5}a{color:var(--color-accent);text-decoration:none}a:hover{text-decoration:underline}.btn{cursor:pointer;border:none;border-radius:4px;justify-content:center;align-items:center;padding:6px 14px;font-size:13px;font-weight:500;transition:background .15s,opacity 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