/* ---------------------------------------------------------------------------
   Behavioural Research Lab, participant sign-up system.

   The palette and the type stack are taken from the RA recruitment poster and
   the lab deck, so that a student who saw the poster on a noticeboard arrives
   at a page that looks like the same lab.
   --------------------------------------------------------------------------- */

:root {
  --wine:      #7b2143;
  --wine-soft: #a35d76;
  --wine-tint: #f6eef1;
  --ink:       #141414;
  --body:      #33302f;
  --meta:      #8d8286;
  --hair:      #ddd6d8;
  --tint:      #f8f3f5;
  --shell:     #e8e3e4;
  --ground:    #ffffff;
  --good:      #2f6b4f;
  --good-tint: #eaf2ed;
  --warn:      #8a5a12;
  --warn-tint: #fbf2e3;
  --bad:       #a32020;
  --bad-tint:  #fbeceb;
  --radius:    10px;
  --shadow:    0 1px 2px rgba(20, 20, 20, .06), 0 8px 24px rgba(20, 20, 20, .05);
  --sans: "Helvetica Neue", Helvetica, Arial, sans-serif;
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.6;
  color: var(--body);
  background: var(--shell);
}

h1, h2, h3, h4 { color: var(--ink); line-height: 1.25; margin: 0 0 .5em; font-weight: 600; }
h1 { font-size: 2rem; letter-spacing: -.02em; }
h2 { font-size: 1.35rem; letter-spacing: -.01em; }
h3 { font-size: 1.05rem; }
h4 { font-size: .95rem; }
p  { margin: 0 0 1em; }
a  { color: var(--wine); }
a:hover { color: var(--ink); }
small { font-size: .85rem; }

/* --- Shell ---------------------------------------------------------------- */

.site-header {
  background: var(--ground);
  border-bottom: 1px solid var(--hair);
  position: sticky;
  top: 0;
  z-index: 20;
}
.site-header .inner {
  max-width: 1120px;
  margin: 0 auto;
  padding: 14px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  flex-wrap: wrap;
}
.wordmark { text-decoration: none; display: block; }
.wordmark .lab {
  display: block;
  font-size: 1rem;
  font-weight: 600;
  color: var(--ink);
  letter-spacing: -.01em;
}
.wordmark .org {
  display: block;
  font-size: .74rem;
  color: var(--meta);
  text-transform: uppercase;
  letter-spacing: .09em;
}
.site-header nav { display: flex; gap: 20px; align-items: center; }
.site-header nav a {
  font-size: .88rem;
  color: var(--body);
  text-decoration: none;
  padding: 4px 0;
  border-bottom: 2px solid transparent;
}
.site-header nav a:hover { color: var(--wine); }
.site-header nav a[aria-current="page"] { color: var(--wine); border-bottom-color: var(--wine); }

main { max-width: 1120px; margin: 0 auto; padding: 32px 24px 80px; }
main.narrow { max-width: 760px; }

.site-footer {
  border-top: 1px solid var(--hair);
  background: var(--ground);
  color: var(--meta);
  font-size: .84rem;
}
.site-footer .inner { max-width: 1120px; margin: 0 auto; padding: 24px; }
.site-footer p { margin: 0 0 .4em; }

/* --- Cards and panels ----------------------------------------------------- */

.card {
  background: var(--ground);
  border: 1px solid var(--hair);
  border-radius: var(--radius);
  padding: 28px;
  margin-bottom: 20px;
  box-shadow: var(--shadow);
}
.card > :last-child { margin-bottom: 0; }
.card.flat { box-shadow: none; }

.eyebrow {
  font-size: .72rem;
  text-transform: uppercase;
  letter-spacing: .1em;
  color: var(--wine);
  font-weight: 600;
  margin: 0 0 6px;
}

.hero {
  background: var(--ground);
  border: 1px solid var(--hair);
  border-top: 3px solid var(--wine);
  border-radius: var(--radius);
  padding: 40px 32px;
  margin-bottom: 22px;
  box-shadow: var(--shadow);
}
.hero p.lede { font-size: 1.08rem; max-width: 62ch; color: var(--body); }

.grid-2 { display: grid; gap: 20px; grid-template-columns: repeat(auto-fit, minmax(280px, 1fr)); }
.grid-3 { display: grid; gap: 16px; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); }

.fact {
  background: var(--tint);
  border: 1px solid var(--hair);
  border-radius: var(--radius);
  padding: 16px 18px;
}
.fact .value { display: block; font-size: 1.7rem; font-weight: 600; color: var(--ink); line-height: 1.2; }
.fact .label { display: block; font-size: .82rem; color: var(--meta); }

ul.plain { margin: 0 0 1em; padding-left: 1.1em; }
ul.plain li { margin-bottom: .4em; }

/* --- Buttons -------------------------------------------------------------- */

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  font: inherit;
  font-size: .92rem;
  font-weight: 500;
  padding: 10px 18px;
  border-radius: 7px;
  border: 1px solid transparent;
  cursor: pointer;
  text-decoration: none;
  transition: background .12s ease, border-color .12s ease, color .12s ease;
}
.button.primary { background: var(--wine); color: #fff; }
.button.primary:hover:not(:disabled) { background: #63182f; color: #fff; }
.button.secondary { background: var(--ground); color: var(--ink); border-color: var(--hair); }
.button.secondary:hover:not(:disabled) { border-color: var(--meta); color: var(--ink); }
.button.danger { background: var(--ground); color: var(--bad); border-color: #e4bcbc; }
.button.danger:hover:not(:disabled) { background: var(--bad-tint); }
.button.small { padding: 6px 12px; font-size: .82rem; }
.button:disabled { opacity: .5; cursor: not-allowed; }
.button-row { display: flex; gap: 10px; flex-wrap: wrap; align-items: center; }

/* --- Forms ---------------------------------------------------------------- */

fieldset { border: 0; padding: 0; margin: 0 0 26px; }
fieldset > legend {
  padding: 0;
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--ink);
  margin-bottom: 4px;
}
.field-note { color: var(--meta); font-size: .86rem; margin: 0 0 14px; }

.form-grid { display: grid; gap: 16px; grid-template-columns: repeat(auto-fit, minmax(230px, 1fr)); }
.form-grid .wide { grid-column: 1 / -1; }

label.field { display: block; font-size: .86rem; font-weight: 500; color: var(--ink); }
label.field .optional { color: var(--meta); font-weight: 400; }

input[type="text"], input[type="email"], input[type="tel"], input[type="number"],
input[type="date"], input[type="time"], input[type="password"], select, textarea {
  display: block;
  width: 100%;
  margin-top: 6px;
  font: inherit;
  font-size: .95rem;
  color: var(--ink);
  padding: 9px 11px;
  border: 1px solid var(--hair);
  border-radius: 7px;
  background: var(--ground);
}
textarea { min-height: 84px; resize: vertical; }
input:focus, select:focus, textarea:focus {
  outline: 2px solid var(--wine-soft);
  outline-offset: 1px;
  border-color: var(--wine-soft);
}
input:disabled, select:disabled { background: var(--tint); color: var(--meta); }

.check {
  display: flex;
  gap: 10px;
  align-items: flex-start;
  padding: 12px 14px;
  border: 1px solid var(--hair);
  border-radius: 7px;
  background: var(--ground);
  margin-bottom: 10px;
  font-size: .9rem;
  cursor: pointer;
}
.check:hover { border-color: var(--wine-soft); }
.check input { margin-top: 3px; flex: none; }
.check.consent { background: var(--tint); }

.radio-row { display: flex; gap: 10px; flex-wrap: wrap; margin-top: 6px; }
.radio-row label {
  display: flex;
  gap: 7px;
  align-items: center;
  font-size: .9rem;
  padding: 8px 13px;
  border: 1px solid var(--hair);
  border-radius: 7px;
  background: var(--ground);
  cursor: pointer;
}
.radio-row label:hover { border-color: var(--wine-soft); }
.radio-row input { accent-color: var(--wine); }

/* --- Messages ------------------------------------------------------------- */

.message {
  padding: 12px 15px;
  border-radius: 7px;
  font-size: .9rem;
  border: 1px solid;
  margin-bottom: 16px;
}
.message.error   { background: var(--bad-tint);  border-color: #e4bcbc; color: var(--bad); }
.message.success { background: var(--good-tint); border-color: #bfd8ca; color: var(--good); }
.message.info    { background: var(--tint);      border-color: var(--hair); color: var(--body); }
.message.warn    { background: var(--warn-tint); border-color: #e6d2ab; color: var(--warn); }
.message ul { margin: 6px 0 0; padding-left: 1.1em; }

.pill {
  display: inline-block;
  font-size: .72rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: .06em;
  padding: 3px 9px;
  border-radius: 999px;
  border: 1px solid;
  white-space: nowrap;
}
.pill.good  { background: var(--good-tint); border-color: #bfd8ca; color: var(--good); }
.pill.warn  { background: var(--warn-tint); border-color: #e6d2ab; color: var(--warn); }
.pill.bad   { background: var(--bad-tint);  border-color: #e4bcbc; color: var(--bad); }
.pill.quiet { background: var(--tint);      border-color: var(--hair); color: var(--meta); }
.pill.wine  { background: var(--wine-tint); border-color: #e2c8d1; color: var(--wine); }

/* --- Study cards ---------------------------------------------------------- */

.study {
  border: 1px solid var(--hair);
  border-radius: var(--radius);
  background: var(--ground);
  margin-bottom: 16px;
  overflow: hidden;
}
.study.ineligible { background: var(--tint); }
.study-head {
  padding: 20px 22px;
  border-bottom: 1px solid var(--hair);
  display: flex;
  justify-content: space-between;
  gap: 16px;
  align-items: flex-start;
  flex-wrap: wrap;
}
.study.ineligible .study-head { border-bottom-color: transparent; }
.study-head h3 { margin: 0 0 4px; }
.study-meta { display: flex; gap: 14px; flex-wrap: wrap; color: var(--meta); font-size: .84rem; margin-top: 8px; }
.study-meta span { white-space: nowrap; }
.study-body { padding: 20px 22px; }

.slot-list { display: grid; gap: 10px; grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); }
.slot {
  display: flex;
  gap: 11px;
  align-items: flex-start;
  border: 1px solid var(--hair);
  border-radius: 7px;
  padding: 13px 15px;
  cursor: pointer;
  background: var(--ground);
}
.slot:hover { border-color: var(--wine-soft); }
.slot input { margin-top: 3px; accent-color: var(--wine); flex: none; }
.slot .when { display: block; font-size: .9rem; font-weight: 500; color: var(--ink); }
.slot .where { display: block; font-size: .82rem; color: var(--meta); }
.slot .left { display: block; font-size: .8rem; color: var(--wine); margin-top: 3px; }
.slot.is-full { opacity: .55; cursor: not-allowed; }

/* --- Tables --------------------------------------------------------------- */

.table-wrap { overflow-x: auto; border: 1px solid var(--hair); border-radius: var(--radius); background: var(--ground); }
table { width: 100%; border-collapse: collapse; font-size: .88rem; }
th, td { padding: 11px 14px; text-align: left; border-bottom: 1px solid var(--hair); vertical-align: top; }
th {
  background: var(--tint);
  font-size: .74rem;
  text-transform: uppercase;
  letter-spacing: .07em;
  color: var(--meta);
  font-weight: 600;
  white-space: nowrap;
  position: sticky;
  top: 0;
}
tbody tr:last-child td { border-bottom: 0; }
tbody tr:hover { background: var(--tint); }
td.numeric, th.numeric { text-align: right; font-variant-numeric: tabular-nums; }
td select { margin-top: 0; font-size: .85rem; padding: 5px 8px; min-width: 130px; }
.empty-row { color: var(--meta); font-style: italic; }

/* --- Tabs ----------------------------------------------------------------- */

.tabs {
  display: flex;
  gap: 4px;
  border-bottom: 1px solid var(--hair);
  margin-bottom: 24px;
  overflow-x: auto;
}
.tab {
  font: inherit;
  font-size: .9rem;
  background: none;
  border: 0;
  border-bottom: 2px solid transparent;
  padding: 10px 14px;
  cursor: pointer;
  color: var(--meta);
  white-space: nowrap;
}
.tab:hover { color: var(--ink); }
.tab[aria-selected="true"] { color: var(--wine); border-bottom-color: var(--wine); font-weight: 500; }

.panel-head {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 18px;
}
.panel-head h2 { margin-bottom: 2px; }
.panel-head p { margin: 0; color: var(--meta); font-size: .88rem; }

/* --- Modal ---------------------------------------------------------------- */

.modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(20, 20, 20, .45);
  display: flex;
  align-items: flex-start;
  justify-content: center;
  padding: 40px 20px;
  overflow-y: auto;
  z-index: 40;
}
.modal-backdrop[hidden] { display: none; }
.modal {
  background: var(--ground);
  border-radius: var(--radius);
  max-width: 720px;
  width: 100%;
  padding: 30px;
  box-shadow: 0 24px 60px rgba(20, 20, 20, .28);
}
.modal-head { display: flex; justify-content: space-between; align-items: flex-start; gap: 16px; margin-bottom: 18px; }
.modal-head h2 { margin: 0; }

.dl { display: grid; grid-template-columns: minmax(120px, auto) 1fr; gap: 6px 18px; font-size: .89rem; margin: 0 0 18px; }
.dl dt { color: var(--meta); }
.dl dd { margin: 0; color: var(--ink); }

.loading { color: var(--meta); font-size: .9rem; padding: 24px 0; }

@media (max-width: 640px) {
  main { padding: 22px 16px 60px; }
  .card, .hero { padding: 22px 18px; }
  h1 { font-size: 1.55rem; }
  .site-header .inner { padding: 12px 16px; }
}

@media print {
  .site-header, .site-footer, .button, .tabs { display: none !important; }
  body { background: #fff; }
  .card, .table-wrap { box-shadow: none; border-color: #999; }
}