:root {
  --bg: #f6f7f9;
  --surface: #ffffff;
  --text: #17202a;
  --muted: #5b6672;
  --border: #d6dbe1;
  --accent: #1f5f8b;
  --accent-text: #ffffff;
  --accent-soft: #e4eef6;
  --danger: #b42318;
  --danger-soft: #fdecea;
  --focus: #2d8cd6;
  --radius: 12px;
  color-scheme: light;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --bg: #0f1419;
    --surface: #18202a;
    --text: #e7ecf1;
    --muted: #9aa6b2;
    --border: #2c3845;
    --accent: #5aa7dc;
    --accent-text: #0b1620;
    --accent-soft: #1d3446;
    --danger: #f2877d;
    --danger-soft: #3a1d1b;
    --focus: #7cc0f0;
    color-scheme: dark;
  }
}
:root[data-theme="dark"] {
  --bg: #0f1419; --surface: #18202a; --text: #e7ecf1; --muted: #9aa6b2; --border: #2c3845;
  --accent: #5aa7dc; --accent-text: #0b1620; --accent-soft: #1d3446; --danger: #f2877d; --danger-soft: #3a1d1b; --focus: #7cc0f0;
  color-scheme: dark;
}

* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 17px/1.5 system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}
a { color: var(--accent); }
[hidden] { display: none !important; }

.top {
  position: sticky; top: 0; z-index: 5;
  background: color-mix(in srgb, var(--bg) 92%, transparent);
  backdrop-filter: blur(6px);
  border-bottom: 1px solid var(--border);
}
.top-row {
  max-width: 680px; margin: 0 auto; padding: 10px 16px;
  display: flex; align-items: center; justify-content: space-between; gap: 12px;
}
.brand { font-size: 14px; font-weight: 600; color: var(--muted); overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.lang-switch {
  flex: none; font: inherit; font-size: 14px; padding: 6px 12px;
  border: 1px solid var(--border); border-radius: 999px; background: var(--surface); color: var(--text); cursor: pointer;
}
.progress { height: 4px; background: var(--border); }
.progress span { display: block; height: 100%; background: var(--accent); transition: width .3s ease; }

.screen { max-width: 680px; margin: 0 auto; padding: 20px 16px 48px; }
.screen.center { text-align: center; padding-top: 12vh; }
h1 { font-size: 26px; line-height: 1.25; margin: 0 0 16px; }
h2 { font-size: 22px; margin: 4px 0 8px; outline: none; }
.bi-title { display: flex; flex-direction: column; gap: 6px; }
.bi-title .muted { font-size: 20px; font-weight: 500; }
.lead { font-size: 18px; }
.muted { color: var(--muted); }
.step { margin: 0; font-size: 14px; color: var(--muted); }
.facts { padding-left: 20px; }
.facts li { margin: 4px 0; }

.privacy { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); padding: 10px 14px; margin: 16px 0; font-size: 15px; }
.privacy summary { cursor: pointer; font-weight: 600; }

.consent { display: flex; gap: 12px; align-items: flex-start; padding: 14px; margin: 16px 0; background: var(--accent-soft); border-radius: var(--radius); cursor: pointer; }
.consent input { width: 22px; height: 22px; margin: 2px 0 0; flex: none; accent-color: var(--accent); }

.lang-choice { display: flex; flex-direction: column; gap: 12px; max-width: 360px; margin: 28px auto 0; }

.btn {
  font: inherit; font-weight: 600; border-radius: 10px; padding: 12px 20px; min-height: 48px; cursor: pointer;
  border: 1px solid transparent; touch-action: manipulation;
}
.btn.primary { background: var(--accent); color: var(--accent-text); }
.btn.primary:disabled { opacity: .45; cursor: not-allowed; }
.btn.ghost { background: transparent; color: var(--text); border-color: var(--border); }
.btn.big { padding: 14px 24px; font-size: 18px; }
.nav { display: flex; justify-content: space-between; gap: 12px; margin-top: 24px; }
.nav.center { justify-content: center; }
.nav .btn.primary { flex: 1; max-width: 320px; margin-left: auto; }
.nav.center .btn.primary { margin: 0; }

:focus-visible { outline: 3px solid var(--focus); outline-offset: 2px; }

.qs { display: flex; flex-direction: column; gap: 14px; margin-top: 16px; }
.q {
  margin: 0; min-width: 0; border: 1px solid var(--border); border-radius: var(--radius);
  background: var(--surface); padding: 16px;
}
.q.invalid { border-color: var(--danger); background: linear-gradient(var(--danger-soft), var(--danger-soft)) top / 100% 4px no-repeat, var(--surface); }
.q-label { font-weight: 600; padding: 0; margin-bottom: 4px; width: 100%; }
legend.q-label { float: left; }
legend.q-label + * { clear: both; }
.opt-tag { font-weight: 400; color: var(--muted); font-size: 14px; }
.help { margin: 2px 0 8px; font-size: 14px; color: var(--muted); }
.err { color: var(--danger); font-size: 15px; margin: 10px 0 0; font-weight: 600; }
.err.big { margin-top: 16px; }
.note { font-size: 14px; color: var(--muted); margin: 8px 0 0; min-height: 0; }
.note:empty { display: none; }

.opts { display: flex; flex-direction: column; gap: 8px; margin-top: 10px; }
.opt {
  display: flex; align-items: center; gap: 12px; padding: 11px 12px; min-height: 48px;
  border: 1px solid var(--border); border-radius: 10px; cursor: pointer; background: var(--surface);
  transition: background .12s, border-color .12s;
}
.opt input { width: 20px; height: 20px; margin: 0; flex: none; accent-color: var(--accent); }
.opt:has(input:checked) { border-color: var(--accent); background: var(--accent-soft); }
.opt:has(input:focus-visible) { outline: 3px solid var(--focus); outline-offset: 1px; }
@media (hover: hover) { .opt:hover { border-color: var(--accent); } }

.other-input, textarea, .combo-input {
  width: 100%; font: inherit; color: var(--text); background: var(--bg);
  border: 1px solid var(--border); border-radius: 10px; padding: 12px; margin-top: 10px;
}
textarea { resize: vertical; min-height: 110px; }

/* combobox */
.combo { position: relative; margin-top: 10px; }
.combo-input { margin-top: 0; padding-right: 44px; font-size: 17px; }
.combo.has-value .combo-input { border-color: var(--accent); background: var(--accent-soft); font-weight: 600; }
.combo-clear {
  position: absolute; right: 4px; top: 4px; width: 40px; height: 40px; border: 0; background: transparent;
  color: var(--muted); font-size: 24px; cursor: pointer; display: none; border-radius: 8px;
}
.combo.has-value .combo-clear { display: block; }
.combo-list {
  list-style: none; margin: 6px 0 0; padding: 4px; border: 1px solid var(--border); border-radius: 10px;
  background: var(--surface); max-height: 320px; overflow-y: auto; box-shadow: 0 8px 24px rgb(0 0 0 / .12);
}
.combo-opt { padding: 10px 12px; border-radius: 8px; cursor: pointer; display: flex; flex-direction: column; }
.combo-opt small { color: var(--muted); font-size: 13px; }
.combo-opt[aria-selected="true"] { background: var(--accent-soft); }
@media (hover: hover) { .combo-opt:hover { background: var(--accent-soft); } }
.combo-opt.special { color: var(--muted); font-style: italic; border-top: 1px dashed var(--border); border-radius: 0; }
.combo-opt.special + .combo-opt.special { border-top: 0; }
.combo-empty { padding: 10px 12px; color: var(--muted); font-size: 14px; }

/* slider */
.slider-row { display: flex; justify-content: center; margin: 10px 0 4px; }
.slider-out { font-size: 30px; font-weight: 700; color: var(--accent); min-height: 44px; }
.untouched .slider-out { font-size: 16px; font-weight: 600; color: var(--muted); padding-top: 10px; }
input[type="range"] {
  width: 100%; height: 44px; margin: 0; background: transparent; -webkit-appearance: none; appearance: none; cursor: pointer;
  --fill: 50%;
}
input[type="range"]::-webkit-slider-runnable-track {
  height: 8px; border-radius: 4px;
  background: linear-gradient(to right, var(--accent) var(--fill), var(--border) var(--fill));
}
.untouched input[type="range"]::-webkit-slider-runnable-track { background: var(--border); }
input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none; width: 30px; height: 30px; margin-top: -11px; border-radius: 50%;
  background: var(--accent); border: 3px solid var(--surface); box-shadow: 0 1px 4px rgb(0 0 0 / .3);
}
.untouched input[type="range"]::-webkit-slider-thumb { background: var(--muted); }
input[type="range"]::-moz-range-track { height: 8px; border-radius: 4px; background: var(--border); }
input[type="range"]::-moz-range-progress { height: 8px; border-radius: 4px; background: var(--accent); }
.untouched input[type="range"]::-moz-range-progress { background: transparent; }
input[type="range"]::-moz-range-thumb { width: 26px; height: 26px; border-radius: 50%; background: var(--accent); border: 3px solid var(--surface); }
.ticks { display: flex; justify-content: space-between; gap: 4px; }
.tick {
  font: inherit; font-size: 14px; color: var(--muted); background: transparent; border: 1px solid var(--border);
  border-radius: 8px; padding: 6px 0; min-height: 36px; flex: 1; cursor: pointer;
}

/* escala 1-5 */
.scale { display: grid; grid-template-columns: repeat(5, 1fr); gap: 8px; margin-top: 12px; }
.scale-opt { position: relative; }
.scale-opt input { position: absolute; opacity: 0; inset: 0; margin: 0; cursor: pointer; }
.scale-opt span {
  display: flex; align-items: center; justify-content: center; min-height: 52px; font-size: 20px; font-weight: 600;
  border: 1px solid var(--border); border-radius: 10px; background: var(--surface);
}
.scale-opt input:checked + span { background: var(--accent); color: var(--accent-text); border-color: var(--accent); }
.scale-opt input:focus-visible + span { outline: 3px solid var(--focus); outline-offset: 2px; }
.scale-legend { display: flex; justify-content: space-between; gap: 12px; font-size: 13px; color: var(--muted); margin-top: 6px; }

/* graella */
.grid-row { padding: 12px 0; border-top: 1px solid var(--border); }
.grid-row:first-of-type { border-top: 0; }
.grid-label { font-weight: 500; margin-bottom: 8px; }
.seg { display: flex; flex-wrap: wrap; gap: 6px; }
.pill { position: relative; }
.pill input { position: absolute; opacity: 0; inset: 0; margin: 0; cursor: pointer; }
.pill span {
  display: inline-flex; align-items: center; min-height: 40px; padding: 6px 12px; font-size: 15px;
  border: 1px solid var(--border); border-radius: 999px; background: var(--surface);
}
.pill input:checked + span { background: var(--accent); color: var(--accent-text); border-color: var(--accent); }
.pill input:focus-visible + span { outline: 3px solid var(--focus); outline-offset: 2px; }

.turnstile { margin-top: 16px; }
.check {
  width: 72px; height: 72px; margin: 0 auto 16px; border-radius: 50%; background: var(--accent); color: var(--accent-text);
  display: flex; align-items: center; justify-content: center; font-size: 40px; font-weight: 700;
}

/* formulari col·laboradors */
.field { display: flex; flex-direction: column; gap: 4px; }
.field input[type="text"], .field input[type="email"], .field input[type="tel"], .field input[type="number"] {
  width: 100%; font: inherit; color: var(--text); background: var(--bg);
  border: 1px solid var(--border); border-radius: 10px; padding: 12px;
}
.row2 { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
@media (max-width: 420px) { .row2 { grid-template-columns: 1fr; } }

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