/* ==========================================================================
   Shared design system (participant site + admin). Flat, minimal, no gradients.
   Components: .topbar .seg .card .btn .field .input .select .check .alert .badge .table
   ========================================================================== */

/* ---------- tokens ---------- */
:root {
  color-scheme: light;
  --bg: #f6f7f9;
  --surface: #ffffff;
  --surface-2: #f1f3f5;
  --border: #d8dde3;
  --text: #1b1f23;
  --muted: #5b6670;
  --primary: #2f8d46;
  --primary-hover: #276e39;
  --on-primary: #ffffff;
  --primary-soft: #e8f5ec;
  --danger: #c62828;
  --danger-soft: #fdecea;
  --amber: #8a5a00;
  --amber-soft: #fff4d6;
  --focus: rgba(47, 141, 70, .35);
  --radius: 6px;
  --font: 'Noto Sans Devanagari', system-ui, -apple-system, 'Segoe UI', Roboto, Arial, sans-serif;
}
@media (prefers-color-scheme: dark) {
  :root[data-theme="auto"] {
    color-scheme: dark;
    --bg: #14171a; --surface: #1e2226; --surface-2: #272c31; --border: #38404a;
    --text: #e8eaed; --muted: #9aa5b0;
    --primary: #4cc16a; --primary-hover: #66d083; --on-primary: #0b1f10; --primary-soft: #1d3326;
    --danger: #ff6b6b; --danger-soft: #3a1f1f; --amber: #f5c451; --amber-soft: #3a3014;
    --focus: rgba(76, 193, 106, .4);
  }
}
:root[data-theme="dark"] {
  color-scheme: dark;
  --bg: #14171a; --surface: #1e2226; --surface-2: #272c31; --border: #38404a;
  --text: #e8eaed; --muted: #9aa5b0;
  --primary: #4cc16a; --primary-hover: #66d083; --on-primary: #0b1f10; --primary-soft: #1d3326;
  --danger: #ff6b6b; --danger-soft: #3a1f1f; --amber: #f5c451; --amber-soft: #3a3014;
  --focus: rgba(76, 193, 106, .4);
}

/* ---------- base ---------- */
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body {
  margin: 0; min-height: 100vh; display: flex; flex-direction: column;
  background: var(--bg); color: var(--text);
  font-family: var(--font); font-size: 16px; line-height: 1.55;
}
[hidden] { display: none !important; }
h1, h2, h3 { line-height: 1.3; margin: 0 0 .5em; }
p { margin: 0 0 .8em; }
a { color: var(--primary); }
.muted { color: var(--muted); }
.center { text-align: center; }
.stack > * + * { margin-top: 12px; }
.row { display: flex; align-items: center; gap: 8px; flex-wrap: wrap; }
.row.between { justify-content: space-between; }
:focus-visible { outline: 2px solid var(--primary); outline-offset: 2px; }

/* ---------- topbar ---------- */
.topbar {
  position: sticky; top: 0; z-index: 20; min-height: 56px;
  display: flex; align-items: center; justify-content: space-between; gap: 10px 16px; flex-wrap: wrap;
  padding: 8px 16px; background: var(--surface); border-bottom: 1px solid var(--border);
}
.brand { font-weight: 700; font-size: 17px; color: var(--primary); text-decoration: none; }
.controls { display: flex; gap: 8px; flex-wrap: wrap; align-items: center; }
.tabs { display: flex; gap: 4px; flex-wrap: wrap; }
.tab { background: none; border: 0; padding: 6px 10px; border-radius: var(--radius); color: var(--muted); font: inherit; font-weight: 600; cursor: pointer; }
.tab:hover { background: var(--surface-2); }
.tab.on { background: var(--primary-soft); color: var(--primary); }

/* segmented switch */
.seg { display: inline-flex; border: 1px solid var(--border); border-radius: var(--radius); overflow: hidden; background: var(--surface); }
.seg button {
  background: none; border: 0; padding: 5px 10px; font: inherit; font-size: 13px; font-weight: 600;
  color: var(--muted); cursor: pointer; border-right: 1px solid var(--border);
}
.seg button:last-child { border-right: 0; }
.seg button:hover { background: var(--surface-2); }
.seg button.on { background: var(--primary-soft); color: var(--primary); }

/* ---------- page ---------- */
.page { flex: 1; width: 100%; display: flex; align-items: center; justify-content: center; padding: 20px 16px; }
.container { width: 100%; max-width: 1200px; margin: 0 auto; padding: 20px 16px; }

/* ---------- card ---------- */
.card { background: var(--surface); border: 1px solid var(--border); border-radius: var(--radius); width: 100%; text-align: left; }
.card-narrow { max-width: 460px; }
.card-wide { max-width: 760px; }
.card-head { padding: 12px 20px; font-weight: 700; border-bottom: 1px solid var(--border); background: var(--surface-2); border-radius: var(--radius) var(--radius) 0 0; }
.card-body { padding: 20px; }
.card h2 { font-size: 21px; }
.pid { font-size: 34px; font-weight: 800; letter-spacing: 2px; color: var(--primary); background: var(--primary-soft); border: 1px solid var(--primary); border-radius: var(--radius); padding: 12px; margin: 16px 0; }
.card .sub { color: var(--muted); font-size: 14px; }

/* ---------- buttons (also styles jsPsych buttons) ---------- */
.btn, .jspsych-btn {
  display: inline-block; padding: 9px 18px; border-radius: var(--radius);
  border: 1px solid var(--primary); background: var(--primary); color: var(--on-primary);
  font: inherit; font-size: 15px; font-weight: 600; line-height: 1.4; text-align: center; text-decoration: none;
  cursor: pointer; margin: 0; transition: background-color .12s, border-color .12s, color .12s;
}
.jspsych-btn { margin: 6px 4px; }
.btn:hover, .jspsych-btn:hover { background: var(--primary-hover); border-color: var(--primary-hover); }
.btn:disabled, .jspsych-btn:disabled { opacity: .45; cursor: not-allowed; background: var(--primary); border-color: var(--primary); }
.btn-block { display: block; width: 100%; }
.btn-sm { padding: 5px 12px; font-size: 13px; }
.btn-outline { background: transparent; color: var(--primary); }
.btn-outline:hover { background: var(--primary-soft); color: var(--primary); border-color: var(--primary); }
.btn-outline:disabled { background: transparent; border-color: var(--primary); }
.btn-ghost { background: var(--surface); color: var(--text); border-color: var(--border); }
.btn-ghost:hover { background: var(--surface-2); color: var(--text); border-color: var(--border); }
.btn-danger { background: transparent; color: var(--danger); border-color: var(--danger); }
.btn-danger:hover { background: var(--danger-soft); color: var(--danger); border-color: var(--danger); }
.btn-link { background: none; border: 0; padding: 0; color: var(--primary); text-decoration: underline; font: inherit; cursor: pointer; }
.btn-link:disabled { color: var(--muted); text-decoration: none; cursor: default; }

/* ---------- fields ---------- */
.field { margin-bottom: 16px; }
.label { display: block; margin-bottom: 5px; font-weight: 600; font-size: 14px; }
.input, .select {
  display: block; width: 100%; padding: 9px 12px; background: var(--surface); color: var(--text);
  border: 1px solid var(--border); border-radius: var(--radius); font: inherit; font-size: 16px;
}
.input::placeholder { color: var(--muted); opacity: .8; }
.input:focus, .select:focus { outline: none; border-color: var(--primary); box-shadow: 0 0 0 3px var(--focus); }
.input:disabled { background: var(--surface-2); color: var(--muted); }
.input-otp { text-align: center; letter-spacing: .5em; font-size: 24px; font-weight: 700; padding-left: .5em; }
.hint { margin-top: 4px; color: var(--muted); font-size: 13px; }
.check { display: flex; gap: 10px; align-items: flex-start; font-size: 14px; }
.check input { margin-top: 4px; width: 18px; height: 18px; accent-color: var(--primary); flex: none; }

/* ---------- alert / badge ---------- */
.alert { padding: 10px 14px; border-radius: var(--radius); border: 1px solid; font-size: 14px; margin: 0 0 14px; }
.alert-error { background: var(--danger-soft); border-color: var(--danger); color: var(--danger); }
.alert-info { background: var(--primary-soft); border-color: var(--primary); color: var(--text); }
.badge { display: inline-block; padding: 2px 10px; border-radius: 999px; font-size: 12px; font-weight: 700; line-height: 1.6; background: var(--surface-2); color: var(--muted); border: 1px solid var(--border); white-space: nowrap; }
.badge-green { background: var(--primary-soft); color: var(--primary); border-color: var(--primary); }
.badge-amber { background: var(--amber-soft); color: var(--amber); border-color: var(--amber); }
.badge-red { background: var(--danger-soft); color: var(--danger); border-color: var(--danger); }

/* ---------- table ---------- */
.table-wrap { overflow-x: auto; -webkit-overflow-scrolling: touch; }
.table { border-collapse: collapse; width: 100%; font-size: 14px; }
.table th, .table td { padding: 8px 10px; border-bottom: 1px solid var(--border); text-align: left; vertical-align: middle; white-space: nowrap; }
.table th { background: var(--surface-2); font-weight: 700; }
.table tr.click { cursor: pointer; }
.table tr.click:hover { background: var(--surface-2); }

/* ---------- spinner ---------- */
.spinner { width: 28px; height: 28px; border: 3px solid var(--border); border-top-color: var(--primary); border-radius: 50%; animation: spin .8s linear infinite; margin: 0 auto 10px; }
@keyframes spin { to { transform: rotate(360deg); } }

/* ---------- jsPsych integration ---------- */
.jspsych-content-wrapper, .jspsych-content { color: var(--text); font-family: var(--font); }
.jspsych-content { font-size: 16px; line-height: 1.55; max-width: 100%; }
.jspsych-display-element { background: transparent; }
.jspsych-btn-group-flex { flex-wrap: wrap; }
.jspsych-survey-html-form-preamble { margin: 0; }
input, select, button, textarea { font-family: inherit; }
audio { color-scheme: light dark; }

@media (max-width: 600px) {
  .topbar { padding: 8px 12px; }
  .card-body { padding: 16px; }
  .card-head { padding: 10px 16px; }
  .page, .container { padding-left: 12px; padding-right: 12px; }
  .btn, .jspsych-btn { padding: 10px 14px; }
}