:root {
  --bg: #f6f4ef;
  --card: #ffffff;
  --ink: #1e232b;
  --muted: #6a7280;
  --accent: #0f6e5c;
  --accent-ink: #ffffff;
  --line: #e2ded4;
  --range: #d9efe9;
  color-scheme: light dark;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #14171c;
    --card: #1d222a;
    --ink: #e8e9ec;
    --muted: #9aa2ad;
    --accent: #34b39a;
    --accent-ink: #0e1512;
    --line: #2c333d;
    --range: #1f3d36;
  }
}

* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: "Avenir Next", "Segoe UI", system-ui, sans-serif;
  background: var(--bg);
  color: var(--ink);
  line-height: 1.5;
  padding: 1.5rem 1rem 3rem;
}

.site-header { max-width: 62rem; margin: 0 auto 1.5rem; }
.site-header h1 { font-size: 2rem; margin: 0 0 0.25rem; letter-spacing: -0.02em; }
.site-header h1 span { color: var(--accent); }
.tagline { max-width: 44rem; color: var(--muted); margin: 0; }
.formula {
  max-width: 44rem;
  margin: 0.5rem 0 0;
  font-size: 0.72rem;
  color: var(--muted);
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.01em;
}

.search-card {
  max-width: 62rem;
  margin: 0 auto 1.25rem;
}
.search-card > label { display: block; font-size: 0.85rem; font-weight: 600; margin-bottom: 0.35rem; }
.search-box { position: relative; }
.search-box input {
  width: 100%;
  padding: 0.65rem 0.75rem;
  font: inherit;
  color: inherit;
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: 10px;
}
.suggestions {
  position: absolute;
  z-index: 10;
  left: 0;
  right: 0;
  top: calc(100% + 4px);
  margin: 0;
  padding: 0.25rem;
  list-style: none;
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 10px;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.12);
}
.suggestions li { padding: 0.45rem 0.6rem; border-radius: 7px; cursor: pointer; font-size: 0.92rem; }
.suggestions li:hover, .suggestions li.active { background: var(--range); }
.search-card .hint { color: var(--muted); font-size: 0.82rem; margin: 0.4rem 0 0; min-height: 1.2em; }

.layout {
  max-width: 62rem;
  margin: 0 auto;
  display: grid;
  grid-template-columns: minmax(0, 22rem) minmax(0, 1fr);
  gap: 1.25rem;
  align-items: start;
}
@media (max-width: 44rem) { .layout { grid-template-columns: 1fr; } }

.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 1.25rem 1.4rem 1.5rem;
}
.card h2 { margin: 0 0 0.75rem; font-size: 1.05rem; }

.form-card label { display: block; font-size: 0.85rem; font-weight: 600; margin: 0.8rem 0 0.25rem; }
.form-card .hint { font-weight: 400; color: var(--muted); }
.form-card select,
.form-card input[type="number"] {
  width: 100%;
  padding: 0.5rem 0.6rem;
  font: inherit;
  color: inherit;
  background: var(--bg);
  border: 1px solid var(--line);
  border-radius: 8px;
}
.row { display: grid; grid-template-columns: 1fr 1fr; gap: 0.75rem; }

fieldset { border: none; margin: 0.9rem 0 0; padding: 0; }
fieldset legend { font-size: 0.85rem; font-weight: 600; padding: 0; margin-bottom: 0.3rem; }
.seg { display: block; }
.seg label { display: inline-flex; margin: 0 0.75rem 0 0; font-weight: 400; align-items: center; gap: 0.3rem; }
.checks label { display: flex; gap: 0.45rem; align-items: center; font-weight: 400; margin: 0.25rem 0; }

.cta {
  margin-top: 1.2rem;
  width: 100%;
  padding: 0.7rem;
  font: inherit;
  font-weight: 700;
  color: var(--accent-ink);
  background: var(--accent);
  border: none;
  border-radius: 10px;
  cursor: pointer;
}
.cta:hover { filter: brightness(1.08); }

.result-card .big-number { font-size: 2.6rem; font-weight: 800; margin: 0.25rem 0 0.75rem; letter-spacing: -0.02em; }
.range-track { height: 10px; border-radius: 5px; background: var(--range); overflow: hidden; }
.range-fill { height: 100%; width: 100%; background: linear-gradient(90deg, transparent, var(--accent), transparent); }
.range-labels { display: flex; justify-content: space-between; color: var(--muted); font-size: 0.85rem; margin-top: 0.25rem; }
.per-sqm { color: var(--muted); font-size: 0.9rem; }
.per-sqm strong { color: var(--ink); }

.provenance {
  margin: 0.4rem 0 0;
  padding: 0.5rem 0.65rem;
  font-size: 0.8rem;
  color: var(--muted);
  background: var(--bg);
  border: 1px dashed var(--line);
  border-radius: 8px;
}

.method { margin-top: 1rem; border-top: 1px solid var(--line); padding-top: 0.75rem; }
.method summary { cursor: pointer; font-weight: 600; font-size: 0.9rem; }
.method table { width: 100%; margin-top: 0.6rem; border-collapse: collapse; font-size: 0.88rem; }
.method td { padding: 0.3rem 0; border-bottom: 1px solid var(--line); }
.method td:last-child { text-align: right; font-variant-numeric: tabular-nums; }
.sources { font-size: 0.8rem; color: var(--muted); }

.site-footer { max-width: 62rem; margin: 2rem auto 0; color: var(--muted); font-size: 0.82rem; }
.attribution { font-size: 0.72rem; }
.attribution a { color: inherit; }