/* ===== Base / Theme (aligned across tools) ===== */
    *{margin:0;padding:0;box-sizing:border-box}
    :root{
      --brand:#2b6777; --brand-2:#52ab98;
      --ink:#333; --muted:#44535a;
      --card:#fff; --bg:#f6f8fb; --bdr:#e7ecf2;
      --radius:14px; --shadow:0 2px 10px rgba(0,0,0,.06);
      --max:1400px;
    }
    body{font-family:system-ui,-apple-system,Segoe UI,Inter,Roboto,Ubuntu,Arial,sans-serif;background:var(--bg);color:var(--ink);line-height:1.6}
    a{text-decoration:none;color:inherit}

    /* Header */
    header.site-header{position:sticky;top:0;z-index:1000;background:#fff;box-shadow:0 2px 6px rgba(0,0,0,.05)}
    .nav-container{max-width:var(--max);margin:auto;padding:12px 20px;display:flex;align-items:center;justify-content:space-between}
    .logo a{font-weight:800;font-size:1.6rem;color:var(--brand)}
    .nav-links{list-style:none;display:flex;gap:22px}
    .nav-links a{color:#4b5b63;font-weight:600}
    .nav-links a:hover{color:var(--brand)}

    /* Hero */
    .hero{background:linear-gradient(120deg,var(--brand),var(--brand-2));color:#fff;text-align:center;padding:72px 20px}
    .hero h1{font-size:2.2rem;margin-bottom:10px;font-weight:800}
    .hero p{max-width:900px;margin:0 auto;opacity:.95}

    /* Layout */
    .section{max-width:var(--max);margin:40px auto 64px;padding:0 20px}
    .tool-grid{display:grid;grid-template-columns:1.15fr .85fr;gap:24px}
    @media (max-width:980px){.tool-grid{grid-template-columns:1fr}}
    .card{background:var(--card);border-radius:var(--radius);box-shadow:var(--shadow);padding:22px}
    .card h2{color:var(--brand);font-size:1.2rem;margin-bottom:10px}

    /* Inputs */
    .grid{display:grid;grid-template-columns:1fr 1fr;gap:12px}
    @media (max-width:720px){.grid{grid-template-columns:1fr}}
    .row{margin:6px 0}
    label{display:block;font-weight:800;color:var(--brand);margin:2px 0 6px}
    input[type=number],select{
      width:100%;padding:12px;border-radius:10px;border:1px solid #d7e3e8;background:#fff;color:var(--ink);
      transition:border-color .2s,box-shadow .2s
    }
    input:focus,select:focus{border-color:var(--brand-2);box-shadow:0 0 0 3px rgba(82,171,152,.2)}
    .hint{font-size:12px;color:#627680;margin-top:4px}

    .btns{display:flex;gap:10px;flex-wrap:wrap;margin-top:12px}
    button{cursor:pointer;border:0;border-radius:10px;font-weight:800;padding:10px 14px}
    button.primary{background:linear-gradient(180deg,var(--brand-2),var(--brand));color:#fff}
    button.secondary{background:#eef6f4;color:var(--brand);border:1px solid #cfe5e0}

    /* Results */
    .result{display:grid;grid-template-columns: 0.85fr 1.15fr;gap:12px;align-items:stretch}
    @media (max-width:720px){.result{grid-template-columns:1fr}}
    .pill{display:inline-flex;gap:6px;align-items:center;padding:4px 8px;border-radius:999px;background:#eef6f4;color:var(--brand);font-size:12px;border:1px solid #cfe5e0}
    .total{background:#fff;border:1px solid var(--bdr);border-radius:12px;padding:14px}
    .num{font:900 32px/1.2 ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;color:var(--brand)}
    .status{font-weight:800;color:var(--brand)}
    .meter{height:12px;background:#f1f6f6;border:1px solid #d8e3e7;border-radius:999px;overflow:hidden;margin-top:10px}
    .meter span{display:block;height:100%;background:linear-gradient(90deg,var(--brand-2),var(--brand));width:0%}

    /* Chart card */
    .canvasWrap{position:relative;background:#fff;border:1px solid var(--bdr);border-radius:var(--radius);padding:12px;min-height:420px}
    .canvasWrap .title{position:absolute;left:12px;top:8px;font-size:13px;color:#3b5561}
    .canvasPad{position:absolute;inset:24px 12px 12px 12px}
    canvas{width:100%;height:100%;display:block}

    /* Footer + disclaimer */
    footer.site-footer{background:var(--brand);color:#fff;text-align:center;padding:20px 10px;margin-top:46px}
    .sf-disclaimer{max-width:var(--max);margin:16px auto 0;padding:12px;border:1px dashed #c7d6e5;border-radius:12px;background:#fff;color:#3a4a5f;font-size:13px}
    .small{font-size:13px;color:#365a61;opacity:.9}