:root{--bg: #ffffff;--fg: #111111;--card: #f7f7f7;--primary: var(--primary-color, #1976d2);--muted: #6b7280;color-scheme:light}:root.dark{--bg: #0f1115;--fg: #e5e7eb;--card: #161a22;--primary: var(--primary-color, #60a5fa);--muted: #94a3b8;color-scheme:dark}html,body,#root{height:100%}body{background:var(--bg);color:var(--fg);transition:background .2s ease,color .2s ease}.card{background:var(--card);border:1px solid rgba(0,0,0,.06);border-radius:12px;padding:12px}.btn{border:1px solid rgba(0,0,0,.1);background:var(--primary);color:#fff;border-radius:10px;padding:8px 12px;cursor:pointer}.btn.secondary{background:transparent;color:var(--fg)}