/* ===== Base / Theme (aligned with other tools) ===== */
  *{margin:0;padding:0;box-sizing:border-box}
  :root{
    --brand:#2b6777; --brand-2:#52ab98;
    --ink:#333; --muted:#4c6076;
    --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:2.1rem;margin-bottom:8px;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:1.05fr .95fr;gap:24px}
  @media(max-width:1024px){.tool-grid{grid-template-columns:1fr}}
  .card{background:var(--card);border-radius:var(--radius);box-shadow:var(--shadow);padding:22px;border:1px solid var(--bdr)}
  .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;flex-wrap:wrap;gap:10px;margin-top:10px}
  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 */
  .kv{display:grid;grid-template-columns:1fr 1fr;gap:12px}
  @media(max-width:720px){.kv{grid-template-columns:1fr}}
  .big{font:900 30px/1.2 ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;color:var(--brand)}
  .meter{height:12px;background:#f1f6f6;border:1px solid #d8e3e7;border-radius:999px;overflow:hidden}
  .meter span{display:block;height:100%;background:linear-gradient(90deg,#34d399,#10b981,#059669);width:0%}

  .table{border:1px solid var(--bdr);border-radius:var(--radius);overflow:hidden;margin-top:10px}
  table{width:100%;border-collapse:collapse;font-size:14px}
  th,td{padding:10px 12px;border-bottom:1px solid var(--bdr);text-align:left}
  th{background:#f7fafc}

  /* Charts */
  .charts{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin-top:12px}
  @media(max-width:900px){.charts{grid-template-columns:1fr}}
  .canvasWrap{position:relative;background:#fff;border:1px solid var(--bdr);border-radius:var(--radius);padding:12px;min-height:300px;overflow:hidden}
  .canvasWrap .title{position:absolute;left:12px;top:8px;font-size:13px;color:#3b5561}
  .canvasPad{position:absolute;inset:32px 12px 12px 12px} /* top padding for titles/legend */
  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}