:root{--bc-blue:#2563eb;--bc-bg:#f7f7f8;--bc-text:#111827;--bc-muted:#6b7280;--bc-card:#fff;--radius:16px}*{box-sizing:border-box}body{background:var(--bc-bg);color:var(--bc-text);font:16px/1.5 -apple-system,system-ui,Segoe UI,Roboto,Inter,Arial}.container{max-width:980px;margin:24px auto;padding:0 16px}h1{font-size:28px}h1,h2{margin:0 0 12px}h2{font-size:20px}.card{background:var(--bc-card);border-radius:var(--radius);padding:20px;box-shadow:0 1px 2px rgba(0,0,0,.08);margin:12px 0}label{color:var(--bc-muted);margin:0 0 6px}input,select,textarea{border:1px solid #e5e7eb;border-radius:10px;background:#fff}input[type=number]{max-width:160px}.row{display:grid;grid-template-columns:1fr;grid-gap:12px;gap:12px}@media(min-width:780px){.row-3{grid-template-columns:repeat(3,1fr)}.row-2{grid-template-columns:repeat(2,1fr)}}.btn{display:inline-flex;align-items:center;gap:8px;background:var(--bc-blue);color:#fff;border:0;border-radius:10px;padding:10px 14px;cursor:pointer}.btn.secondary{background:#eef2ff;color:#1e3a8a}.btn:disabled{opacity:.6;cursor:not-allowed}.badge{display:inline-block;font-size:12px;padding:4px 8px;border-radius:999px;background:#eef2ff;color:#1e3a8a}.hr{height:1px;background:#e5e7eb;margin:8px 0}.help{font-size:12px;color:var(--bc-muted)}.header{display:flex;align-items:center;justify-content:space-between;margin-bottom:8px}.small{font-size:12px}.select{max-width:360px}.chart{height:240px}body{font-family:system-ui,-apple-system,sans-serif;background:#f7f7f8;margin:0}.card{background:#fff;border-radius:16px;padding:24px;box-shadow:0 1px 2px rgba(0,0,0,.1);margin-bottom:16px}button{background:#2563eb;color:#fff;border:none;border-radius:8px;padding:10px 14px;cursor:pointer}button.secondary{background:#f3f4f6;color:#111}label{font-size:12px;display:block;margin-bottom:6px}input,select,textarea{width:100%;padding:10px 12px;border:1px solid #ddd;border-radius:8px;margin-bottom:8px}