/* Stile minimale e sobrio, mobile-first. */
:root {
  color-scheme: light dark;
  --bg: #ffffff;
  --fg: #111111;
  --muted: #6b6b6b;
  --line: #e2e2e2;
  --accent: #111111;
  --warn: #a15c00;
  --danger: #b3261e;
  --radius: 2px;
  --font: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --mono: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #111111;
    --fg: #f2f2f2;
    --muted: #9a9a9a;
    --line: #2c2c2c;
    --accent: #f2f2f2;
    --warn: #e0a24a;
    --danger: #ff8a80;
  }
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font: 16px/1.45 var(--font);
  padding: 0 16px env(safe-area-inset-bottom);
  max-width: 720px;
  margin-inline: auto;
}

.top { padding: 28px 0 12px; border-bottom: 1px solid var(--fg); }
h1 { font-size: 1.35rem; font-weight: 600; letter-spacing: 0.02em; margin: 0; }
.tagline { margin: 4px 0 0; color: var(--muted); font-size: 0.9rem; }

.controls { display: grid; gap: 14px; padding: 18px 0; }
.row { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.field { display: grid; gap: 6px; margin: 0; padding: 0; border: 0; min-width: 0; }
.field > span, .field > legend {
  font-size: 0.75rem; text-transform: uppercase; letter-spacing: 0.08em; color: var(--muted); padding: 0;
}
.help { color: var(--muted); font-size: 0.8rem; }

input, select, button { font: inherit; color: inherit; }
input[type="number"], input[type="text"], select {
  width: 100%;
  background: transparent;
  border: 0;
  border-bottom: 1px solid var(--line);
  border-radius: 0;
  padding: 8px 0;
  min-height: 44px;
  outline: none;
}
input:focus, select:focus { border-bottom-color: var(--fg); }
select { appearance: none; background-image: linear-gradient(45deg, transparent 50%, var(--muted) 50%), linear-gradient(135deg, var(--muted) 50%, transparent 50%); background-position: right 6px center, right 1px center; background-size: 5px 5px; background-repeat: no-repeat; padding-right: 18px; }
/* Il menu a tendina nativo segue il tema chiaro/scuro; le categorie restano leggibili e distinte. */
/* Colori di sistema: titoli di categoria e voci sempre sullo stesso sfondo, in entrambi i temi
   e su tutti i sistemi (su Windows lo sfondo dei titoli di gruppo non si puo colorare). */
select optgroup, select option { background-color: Canvas; color: CanvasText; }
select optgroup { font-weight: 700; font-style: normal; }
select option { font-weight: 400; }
#tuning { font-family: var(--mono); letter-spacing: 0.02em; }

.segmented { display: grid; grid-template-columns: 1fr 1fr; border: 1px solid var(--fg); border-radius: var(--radius); }
.segmented label { position: relative; text-align: center; }
.segmented input { position: absolute; opacity: 0; inset: 0; margin: 0; }
.segmented span { display: block; padding: 10px 6px; font-size: 0.9rem; cursor: pointer; min-height: 44px; }
.segmented input:checked + span { background: var(--fg); color: var(--bg); }
.segmented input:focus-visible + span { outline: 2px solid var(--fg); outline-offset: 2px; }

.error { color: var(--danger); font-size: 0.9rem; margin: 0 0 12px; }

.results { border-top: 1px solid var(--fg); padding-top: 8px; }
table { width: 100%; border-collapse: collapse; font-variant-numeric: tabular-nums; }
th {
  font-size: 0.7rem; text-transform: uppercase; letter-spacing: 0.08em; color: var(--muted);
  text-align: left; font-weight: 500; padding: 8px 4px; border-bottom: 1px solid var(--line);
}
td { padding: 10px 4px; border-bottom: 1px solid var(--line); vertical-align: top; }
.num { text-align: right; }
td.num { font-family: var(--mono); font-size: 0.95rem; }
tr.course-start td { border-top: 1px solid var(--fg); }
tr.course-start:first-child td { border-top: 0; }
.hz { display: block; white-space: nowrap; color: var(--muted); font-size: 0.75rem; font-family: var(--mono); }
.gou-delta { display: block; color: var(--muted); font-size: 0.7rem; }
.flags { display: block; font-size: 0.75rem; margin-top: 2px; }
.flag-warn { color: var(--warn); }
.flag-danger { color: var(--danger); }
.dim { color: var(--muted); }

.total { margin: 14px 0; font-size: 0.95rem; }
.button {
  border: 1px solid var(--fg); background: transparent; padding: 10px 18px; min-height: 44px;
  border-radius: var(--radius); cursor: pointer;
}
.button:active { background: var(--fg); color: var(--bg); }

.foot { color: var(--muted); font-size: 0.8rem; padding: 24px 0 32px; border-top: 1px solid var(--line); margin-top: 24px; }

@media (max-width: 380px) {
  td, th { padding-inline: 2px; }
  td.num { font-size: 0.85rem; }
}

/* Corde reperibili */
tr.matches-row td { border-bottom: 1px solid var(--line); padding: 0 4px 10px; }
tr.string-row td, tr.course-start td { border-bottom: 0; }
.matches { list-style: none; margin: 0; padding: 0 0 0 calc(2.2em); display: grid; gap: 6px; }
.matches li { display: grid; grid-template-columns: auto 1fr; column-gap: 8px; font-size: 0.82rem; }
.m-code { font-family: var(--mono); font-weight: 600; }
.m-series { color: var(--muted); }
.m-detail { grid-column: 2; color: var(--muted); font-family: var(--mono); font-size: 0.75rem; }
.small { font-size: 0.8rem; }

/* Dettaglio fisico per corda */
tr.clickable { cursor: pointer; }
tr.clickable:focus-visible td { outline: 2px solid var(--fg); outline-offset: -2px; }
tr.clickable[aria-expanded="true"] td { background: color-mix(in srgb, var(--fg) 5%, transparent); }
tr.detail-row td { padding: 4px 0 14px; border-bottom: 1px solid var(--line); }
.detail { display: grid; gap: 10px; }
.tiles { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; }
.tile { border: 1px solid var(--line); border-radius: var(--radius); padding: 10px; display: grid; gap: 2px; min-width: 0; }
.tile-label { font-size: 0.7rem; text-transform: uppercase; letter-spacing: 0.06em; color: var(--muted); }
.tile-value { font-family: var(--mono); font-size: 1.05rem; }
.tile-sub { font-size: 0.75rem; color: var(--muted); }
.detail-title { margin: 6px 0 0; font-size: 0.75rem; text-transform: uppercase; letter-spacing: 0.06em; color: var(--muted); }
.bars { list-style: none; margin: 0; padding: 0; display: grid; gap: 3px; }
.bars li { display: grid; grid-template-columns: 1.6em 1fr 4.6em; align-items: center; gap: 6px; font-family: var(--mono); font-size: 0.72rem; }
.bar-n { color: var(--muted); text-align: right; }
.bar-track { height: 8px; background: var(--line); border-radius: 1px; overflow: hidden; }
.bar { display: block; height: 100%; background: var(--fg); }
.bar-v { text-align: right; color: var(--muted); }
.detail-note { margin: 0; font-size: 0.75rem; color: var(--muted); }
.hint { margin: 10px 0 0; font-size: 0.8rem; color: var(--muted); }
.m-buy { grid-column: 2; font-size: 0.75rem; color: var(--muted); }
.m-buy a { color: var(--fg); text-decoration: underline; text-underline-offset: 2px; }