:root {
    --ink: #1e2b37;
    --ink-2: #4a5b6a;
    --paper: #f2f5f7;
    --panel: #ffffff;
    --line: #cbd5dd;
    --cobalt: #1b4f9c;
    --cobalt-soft: #dce7f5;
    --amber: #d08a1e;
    --slate: #7c8fa0;
    --danger: #b3261e;
    --serif: "Iowan Old Style", "Palatino Linotype", Palatino, "Book Antiqua", Georgia, serif;
    --sans: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  }
  * { box-sizing: border-box; }
  html { -webkit-text-size-adjust: 100%; }
  body {
    margin: 0;
    background: var(--paper);
    color: var(--ink);
    font: 1rem/1.6 var(--sans);
  }
  a { color: var(--cobalt); }
  :focus-visible { outline: 3px solid var(--cobalt); outline-offset: 2px; }

  .wrap { max-width: 1040px; margin: 0 auto; padding: 0 20px; }

  .site-head { border-bottom: 1px solid var(--line); background: var(--panel); }
  .site-head .wrap { padding-top: 16px; padding-bottom: 16px; }
  .brand { font: 700 1.15rem var(--serif); color: var(--ink); text-decoration: none; }

  .intro { padding: 36px 0 20px; }
  h1 { font: 700 clamp(1.8rem, 4.5vw, 2.5rem)/1.15 var(--serif); margin: 0 0 12px; letter-spacing: -0.01em; }
  .lead { margin: 0; max-width: 62ch; color: var(--ink-2); font-size: 1.08rem; }

  /* Emplacements publicitaires : hauteur réservée pour éviter les sauts de page */
  .ad {
    min-height: 110px;
    margin: 20px 0;
    border: 1px dashed #9fb0be;
    border-radius: 4px;
    display: grid;
    place-items: center;
    text-align: center;
    padding: 8px;
    color: #5d6e7c;
    font-size: 0.82rem;
  }

  .tool { background: var(--panel); border: 1px solid var(--line); border-radius: 6px; overflow: hidden; }
  .tabs { display: flex; border-bottom: 1px solid var(--line); }
  .tab {
    flex: 1;
    padding: 14px 10px;
    background: none;
    border: 0;
    border-bottom: 3px solid transparent;
    font: 600 0.98rem var(--sans);
    color: var(--ink-2);
    cursor: pointer;
  }
  .tab[aria-selected="true"] { color: var(--cobalt); border-bottom-color: var(--cobalt); background: #f7faff; }

  .grid { display: grid; grid-template-columns: 340px minmax(0, 1fr); }
  .inputs { padding: 24px; border-right: 1px solid var(--line); }
  .results { padding: 26px 30px 30px; min-width: 0; }

  .field { margin-bottom: 18px; }
  .field label { display: block; font-weight: 600; font-size: 0.92rem; margin-bottom: 5px; }
  .input-wrap { display: flex; border: 1px solid #9fb0be; border-radius: 4px; background: #fff; }
  .input-wrap:focus-within { outline: 3px solid var(--cobalt); outline-offset: 1px; }
  .input-wrap.invalid { border-color: var(--danger); }
  .input-wrap input {
    flex: 1;
    min-width: 0;
    border: 0;
    padding: 10px 12px;
    font: 1.05rem var(--sans);
    font-variant-numeric: tabular-nums;
    background: transparent;
    color: var(--ink);
    outline: none;
  }
  .unit {
    padding: 10px 12px;
    background: #eef2f5;
    border-left: 1px solid #9fb0be;
    color: var(--ink-2);
    font-size: 0.9rem;
    white-space: nowrap;
  }
  .hint { margin: 5px 0 0; font-size: 0.82rem; color: var(--ink-2); }
  .field[hidden] { display: none; }

  .big-label { margin: 0; color: var(--ink-2); }
  .big {
    margin: 2px 0 4px;
    font: 700 clamp(2.5rem, 7vw, 3.6rem)/1.1 var(--serif);
    color: var(--cobalt);
    font-variant-numeric: lining-nums tabular-nums;
    overflow-wrap: anywhere;
  }
  .big-sub { margin: 0; color: var(--ink-2); }

  .split { display: flex; height: 14px; border-radius: 3px; overflow: hidden; background: #e3e9ee; margin: 24px 0 10px; }
  .split span { display: block; height: 100%; transition: width 0.25s ease; }
  .seg-cap { background: var(--cobalt); }
  .seg-int { background: var(--amber); }
  .seg-ins { background: var(--slate); }
  .legend { display: flex; flex-wrap: wrap; gap: 6px 20px; margin: 0; padding: 0; list-style: none; font-size: 0.88rem; color: var(--ink-2); }
  .legend i { display: inline-block; width: 10px; height: 10px; border-radius: 2px; margin-right: 6px; }

  .rows { margin: 22px 0 0; border-top: 1px solid var(--line); }
  .rows div { display: flex; justify-content: space-between; gap: 16px; padding: 9px 0; border-bottom: 1px solid var(--line); }
  .rows dt { color: var(--ink-2); }
  .rows dd { margin: 0; font-weight: 600; font-variant-numeric: tabular-nums; text-align: right; }
  .rows .total dt { color: var(--ink); font-weight: 600; }
  .rows .total dd { font-weight: 700; }

  .note { margin: 18px 0 0; padding: 12px 14px; background: var(--cobalt-soft); border-radius: 4px; font-size: 0.93rem; }
  .note[hidden], #out[hidden], #msg[hidden] { display: none; }
  #msg { margin: 0; padding: 14px; background: #fdecea; border-radius: 4px; color: #5f1410; }

  .chart-block { margin-top: 32px; }
  .chart-block h2 { font: 700 1.2rem var(--serif); margin: 0 0 6px; }
  .chart-block p { margin: 0 0 10px; color: var(--ink-2); font-size: 0.92rem; }
  .chart { width: 100%; height: auto; display: block; }
  .chart .bar-cap { fill: var(--cobalt); }
  .chart .bar-int { fill: var(--amber); }
  .chart text { font: 14px var(--sans); fill: var(--ink-2); }
  .chart line { stroke: var(--line); }

  details.table-wrap { margin-top: 22px; border-top: 1px solid var(--line); padding-top: 12px; }
  details.table-wrap summary { cursor: pointer; font-weight: 600; color: var(--cobalt); }
  .scroll { overflow-x: auto; margin-top: 12px; }
  table { border-collapse: collapse; width: 100%; min-width: 520px; font-variant-numeric: tabular-nums; font-size: 0.92rem; }
  th, td { padding: 8px 10px; text-align: right; border-bottom: 1px solid var(--line); }
  th:first-child, td:first-child { text-align: left; }
  th { font-weight: 600; background: #f3f6f8; }

  .article { max-width: 70ch; padding: 24px 0 8px; }
  .article h2 { font: 700 1.5rem/1.25 var(--serif); margin: 32px 0 10px; }
  .article p { margin: 0 0 14px; }
  .formula { padding: 14px 16px; background: var(--panel); border: 1px solid var(--line); border-radius: 4px; font-family: var(--serif); font-size: 1.1rem; overflow-x: auto; }

  .faq details { border-bottom: 1px solid var(--line); padding: 14px 0; }
  .faq details:first-of-type { border-top: 1px solid var(--line); }
  .faq summary { cursor: pointer; font-weight: 600; }
  .faq details p { margin: 10px 0 0; }

  .site-foot { margin-top: 40px; border-top: 1px solid var(--line); background: var(--panel); }
  .site-foot .wrap { padding-top: 24px; padding-bottom: 32px; font-size: 0.88rem; color: var(--ink-2); }
  .site-foot nav { display: flex; flex-wrap: wrap; gap: 6px 18px; margin-top: 10px; }

  @media (max-width: 820px) {
    .grid { grid-template-columns: minmax(0, 1fr); }
    .inputs { border-right: 0; border-bottom: 1px solid var(--line); min-width: 0; }
    .results { padding: 22px 20px 26px; }
    .tab { font-size: 0.9rem; padding: 12px 6px; }
  }
  @media (prefers-reduced-motion: reduce) {
    .split span { transition: none; }
  }

/* ---- Ajouts du site ---- */
.site-head .wrap { display: flex; flex-wrap: wrap; align-items: center; justify-content: space-between; gap: 4px 28px; }
.nav { display: flex; flex-wrap: wrap; gap: 2px 22px; }
.nav a { color: var(--ink-2); text-decoration: none; font-weight: 600; font-size: 0.95rem; padding: 6px 0; border-bottom: 2px solid transparent; }
.nav a:hover, .nav a[aria-current="page"] { color: var(--cobalt); border-bottom-color: var(--cobalt); }

.tool-list { list-style: none; margin: 8px 0 0; padding: 0; border-top: 1px solid var(--line); }
.tool-list li { border-bottom: 1px solid var(--line); }
.tool-list a { display: block; padding: 24px 4px; text-decoration: none; color: inherit; }
.tool-list a:hover .tl-title { text-decoration: underline; }
.tl-title { display: block; font: 700 1.4rem/1.25 var(--serif); color: var(--cobalt); }
.tl-text { display: block; margin-top: 6px; color: var(--ink-2); max-width: 62ch; }

.see-also { margin: 32px 0 0; padding: 18px 20px; background: var(--panel); border: 1px solid var(--line); border-radius: 6px; max-width: 70ch; }
.see-also h2 { font: 700 1.1rem var(--serif); margin: 0 0 6px; }
.see-also p { margin: 0; }

.input-wrap select { flex: 1; min-width: 0; border: 0; padding: 10px 8px; font: 1rem var(--sans); background: transparent; color: var(--ink); outline: none; }
.check { display: flex; gap: 10px; align-items: flex-start; font-weight: 600; font-size: 0.92rem; cursor: pointer; }
.check input { margin-top: 4px; width: 18px; height: 18px; accent-color: var(--cobalt); flex: none; }

.seg-a { background: var(--cobalt); }
.seg-b { background: var(--amber); }
.seg-c { background: var(--slate); }

.fees-table-wrap { margin-top: 32px; }
.fees-table-wrap h2 { font: 700 1.2rem var(--serif); margin: 0 0 6px; }
.fees-table-wrap p { margin: 0 0 10px; color: var(--ink-2); font-size: 0.92rem; }
.fees-table-wrap table { background: var(--panel); border: 1px solid var(--line); }

.sources { font-size: 0.9rem; color: var(--ink-2); }
.sources a { overflow-wrap: anywhere; }
.updated { font-size: 0.88rem; color: var(--ink-2); margin: 0 0 14px; }
.lead + .lead { margin-top: 10px; }