/* terugverdiend.be: leesbaar voor huiseigenaars van elke leeftijd.
   Systeemlettertypes (geen externe fonts: sneller en geen doorgifte van IP-adressen). */
:root {
  --bg: #f4f6f7;
  --surface: #ffffff;
  --ink: #17232b;
  --muted: #56666f;
  --rule: #d8e0e4;
  --accent: #1f5f7a;
  --accent-ink: #ffffff;
  --accent-soft: #e2eef3;
  --pos: #2b7a49;
  --neg: #b5452c;
  --sun: #c98204;
  --font: "Segoe UI Variable Text", "Segoe UI", -apple-system, BlinkMacSystemFont, "Helvetica Neue", Roboto, Arial, sans-serif;
  --font-display: "Segoe UI Variable Display", "Segoe UI", -apple-system, BlinkMacSystemFont, "Helvetica Neue", Roboto, Arial, sans-serif;
  --radius: 6px;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #10171c; --surface: #172129; --ink: #e5ecef; --muted: #9aabb4; --rule: #2a3843;
    --accent: #6fb3d2; --accent-ink: #0d1a21; --accent-soft: #1b3240;
    --pos: #6cc893; --neg: #ef8a6f; --sun: #f0b84a; color-scheme: dark;
  }
}
* { box-sizing: border-box; }
[hidden] { display: none !important; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0; background: var(--bg); color: var(--ink);
  font-family: var(--font); font-size: 17px; line-height: 1.6;
}
a { color: var(--accent); }
a:focus-visible, button:focus-visible, input:focus-visible, select:focus-visible {
  outline: 3px solid var(--sun); outline-offset: 2px;
}
h1, h2, h3 { font-family: var(--font-display); line-height: 1.15; text-wrap: balance; margin: 0; }
h1 { font-size: clamp(1.8rem, 4.5vw, 2.6rem); font-weight: 800; letter-spacing: -0.015em; }
h2 { font-size: 1.45rem; font-weight: 750; }
h3 { font-size: 1.1rem; font-weight: 700; }
p { margin: 0; }
.container {
  max-width: 1080px; margin: 0 auto;
  padding-left: max(16px, env(safe-area-inset-left, 0px));
  padding-right: max(16px, env(safe-area-inset-right, 0px));
}

/* Kop en voet */
.site-header { border-bottom: 1px solid var(--rule); background: var(--surface); }
.site-header .container { display: flex; align-items: center; justify-content: space-between; gap: 16px; padding-block: 12px; flex-wrap: wrap; }
.logo { display: inline-flex; align-items: center; gap: 8px; text-decoration: none; color: var(--ink); font-family: var(--font-display); font-weight: 800; font-size: 1.15rem; letter-spacing: -0.01em; }
.logo svg { width: 28px; height: 28px; }
.logo span { color: var(--muted); font-weight: 600; }
.nav { display: flex; gap: 4px 16px; flex-wrap: wrap; font-size: 0.95rem; }
.nav a { color: var(--ink); text-decoration: none; padding: 4px 0; border-bottom: 2px solid transparent; }
.nav a:hover, .nav a[aria-current="page"] { border-bottom-color: var(--accent); }
.site-footer { margin-top: 64px; border-top: 1px solid var(--rule); background: var(--surface); font-size: 0.9rem; color: var(--muted); }
.site-footer .container { padding-block: 28px; display: flex; flex-direction: column; gap: 10px; }
.site-footer nav { display: flex; gap: 16px; flex-wrap: wrap; }

/* Paginakop */
.page-head { padding-block: 36px 24px; display: flex; flex-direction: column; gap: 12px; }
.page-head p { color: var(--muted); font-size: 1.08rem; max-width: 62ch; }
.stamp { font-size: 0.82rem; color: var(--muted); }

/* Rekentool: formulier links, resultaat rechts */
.calc { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 420px); gap: 24px; align-items: start; }
@media (max-width: 860px) { .calc { grid-template-columns: minmax(0, 1fr); } }
.panel { background: var(--surface); border: 1px solid var(--rule); border-radius: var(--radius); padding: 20px; }
.form { display: flex; flex-direction: column; gap: 22px; }
fieldset { border: 0; padding: 0; margin: 0; display: flex; flex-direction: column; gap: 14px; }
legend { font-family: var(--font-display); font-weight: 700; font-size: 1.05rem; padding: 0; margin-bottom: 4px; }
.field { display: grid; gap: 4px; }
.field label { font-weight: 600; font-size: 0.95rem; }
.field .row { display: flex; align-items: center; gap: 8px; }
.field input[type="number"], .field select {
  font: inherit; font-size: 1rem; width: 100%; max-width: 220px; padding: 8px 10px;
  border: 1px solid var(--rule); border-radius: var(--radius); background: var(--bg); color: var(--ink);
  font-variant-numeric: tabular-nums;
}
.field select { max-width: 100%; }
.field .unit { color: var(--muted); font-size: 0.9rem; white-space: nowrap; }
.field .help { color: var(--muted); font-size: 0.85rem; }
.field .help a { font-size: 0.85rem; }
.check { display: flex; gap: 10px; align-items: flex-start; font-size: 0.95rem; }
.check input { margin-top: 5px; width: 18px; height: 18px; accent-color: var(--accent); }
details.advanced { border-top: 1px solid var(--rule); padding-top: 14px; }
details.advanced summary { cursor: pointer; font-weight: 600; color: var(--accent); }
details.advanced[open] summary { margin-bottom: 14px; }
details.advanced > div { display: flex; flex-direction: column; gap: 14px; }

/* Resultaat */
.result { position: sticky; top: 16px; display: flex; flex-direction: column; gap: 16px; }
.verdict { display: flex; flex-direction: column; gap: 2px; }
.verdict .label { font-size: 0.85rem; color: var(--muted); text-transform: uppercase; letter-spacing: 0.06em; font-weight: 600; }
.verdict .big { font-family: var(--font-display); font-size: 2.6rem; font-weight: 800; letter-spacing: -0.02em; font-variant-numeric: tabular-nums; line-height: 1.1; }
.verdict .sub { color: var(--muted); font-size: 0.95rem; }
.verdict.bad .big { color: var(--neg); }
.figures { display: grid; grid-template-columns: 1fr 1fr; gap: 10px 16px; margin: 0; }
.figures div { border-top: 1px solid var(--rule); padding-top: 8px; display: flex; flex-direction: column; }
.figures dt { font-size: 0.8rem; color: var(--muted); }
.figures dd { margin: 0; font-weight: 700; font-variant-numeric: tabular-nums; }
.chart { width: 100%; height: auto; display: block; }
.chart .axis { stroke: var(--rule); }
.chart .zero { stroke: var(--muted); stroke-dasharray: 3 3; }
.chart text { fill: var(--muted); font-size: 11px; font-family: var(--font); }
.chart .neg { fill: var(--neg); }
.chart .pos { fill: var(--pos); }
.chart .mark { stroke: var(--sun); stroke-width: 2; }
.chart .marklabel { fill: var(--sun); font-weight: 700; }
.note { font-size: 0.85rem; color: var(--muted); }

/* Partnerblok (affiliate) */
.partner { border: 1px solid var(--accent); background: var(--accent-soft); border-radius: var(--radius); padding: 16px; display: flex; flex-direction: column; gap: 8px; }
.partner .btn { align-self: flex-start; }
.partner small { color: var(--muted); font-size: 0.78rem; }
.btn { display: inline-block; background: var(--accent); color: var(--accent-ink); text-decoration: none; font-weight: 700; padding: 10px 16px; border-radius: var(--radius); border: 0; font: inherit; font-weight: 700; cursor: pointer; }
.btn:hover { filter: brightness(1.08); }

/* Uitleg en lopende tekst */
.prose { max-width: 70ch; display: flex; flex-direction: column; gap: 14px; }
.prose ul, .prose ol { margin: 0; padding-left: 1.2em; display: flex; flex-direction: column; gap: 6px; }
.section { padding-top: 48px; display: flex; flex-direction: column; gap: 16px; }
.faq details { border-bottom: 1px solid var(--rule); padding-block: 12px; }
.faq summary { cursor: pointer; font-weight: 650; }
.faq details p { margin-top: 8px; color: var(--ink); }

/* Startpagina */
.tools { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 16px; }
.tool { background: var(--surface); border: 1px solid var(--rule); border-radius: var(--radius); padding: 22px; text-decoration: none; color: var(--ink); display: flex; flex-direction: column; gap: 8px; transition: border-color .15s; }
.tool:hover { border-color: var(--accent); }
.tool .q { font-family: var(--font-display); font-weight: 750; font-size: 1.2rem; line-height: 1.2; }
.tool p { color: var(--muted); font-size: 0.95rem; }
.tool .go { color: var(--accent); font-weight: 700; margin-top: auto; }

/* Bronnentabel */
.table-wrap { overflow-x: auto; border: 1px solid var(--rule); border-radius: var(--radius); background: var(--surface); }
table { border-collapse: collapse; width: 100%; font-size: 0.9rem; }
th, td { text-align: left; padding: 9px 12px; border-bottom: 1px solid var(--rule); vertical-align: top; }
th { font-size: 0.78rem; text-transform: uppercase; letter-spacing: 0.05em; color: var(--muted); background: var(--bg); }
td.num { font-variant-numeric: tabular-nums; white-space: nowrap; }
.flag { font-size: 0.75rem; color: var(--neg); font-weight: 600; }

@media (prefers-reduced-motion: reduce) { * { transition: none !important; } }