:root {
  --bg: #f6f7f9;
  --surface: #ffffff;
  --surface-2: #f1f3f6;
  --fg: #16191d;
  --muted: #5c6670;
  --line: #e1e5ea;
  --accent: #2456d6;
  --accent-soft: #e8eefc;
  --accent-fg: #ffffff;
  --ok: #1d7a4a;
  --ok-soft: #e5f4ec;
  --warn: #8a4b00;
  --warn-soft: #fff3e0;
  --bad: #a52a2a;
  --bad-soft: #fdecec;
  --p: #6a3fb5;
  --p-soft: #f1ebfb;
  --t: #1f7468;
  --t-soft: #e3f4f1;
  --radius: 14px;
  --shadow: 0 1px 2px rgba(16, 24, 40, .05), 0 4px 16px rgba(16, 24, 40, .06);
  color-scheme: light dark;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1114;
    --surface: #171a1f;
    --surface-2: #1e2229;
    --fg: #e7eaee;
    --muted: #98a2ad;
    --line: #2a2f37;
    --accent: #6d9bff;
    --accent-soft: #1b2640;
    --accent-fg: #0b1020;
    --ok: #5fd39a;
    --ok-soft: #12291e;
    --warn: #f3c37c;
    --warn-soft: #2e2311;
    --bad: #f39a9a;
    --bad-soft: #2f1717;
    --p: #c3a6f5;
    --p-soft: #251c36;
    --t: #7fd7c9;
    --t-soft: #11292a;
    --shadow: 0 1px 2px rgba(0, 0, 0, .3);
  }
}

* { box-sizing: border-box; }
[hidden] { display: none !important; }

html, body { margin: 0; }

body {
  background: var(--bg);
  color: var(--fg);
  font: 16px/1.6 Inter, system-ui, -apple-system, "Segoe UI", sans-serif;
  -webkit-font-smoothing: antialiased;
}

a { color: var(--accent); }
h1 { font-size: 28px; line-height: 1.25; margin: 0 0 8px; letter-spacing: -.01em; }
h2 { font-size: 20px; line-height: 1.3; margin: 0 0 8px; }
h3 { font-size: 16px; margin: 20px 0 6px; }
p { margin: 0 0 12px; }
.muted { color: var(--muted); }
.small { font-size: 14px; }

/* ---------- top bar ---------- */

.topbar {
  position: sticky; top: 0; z-index: 10;
  background: color-mix(in srgb, var(--bg) 88%, transparent);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line);
}
.topbar-inner {
  max-width: 880px; margin: 0 auto; padding: 12px 16px;
  display: flex; align-items: center; justify-content: space-between; gap: 16px; flex-wrap: wrap;
}
.brand { font-weight: 700; letter-spacing: -.01em; }
.brand[data-quick]::after {
  content: attr(data-quick); margin-left: 10px; font-size: 12px; font-weight: 600;
  padding: 2px 8px; border-radius: 999px; background: var(--warn-soft); color: var(--warn);
}

.stepper { display: flex; gap: 6px; list-style: none; margin: 0; padding: 0; flex-wrap: wrap; }
.stepper li {
  display: flex; align-items: center; gap: 6px;
  font-size: 13px; color: var(--muted); padding: 4px 10px; border-radius: 999px;
}
.stepper li::before {
  content: ""; width: 8px; height: 8px; border-radius: 50%; background: var(--line);
}
.stepper li.done::before { background: var(--ok); }
.stepper li.current { background: var(--accent-soft); color: var(--accent); font-weight: 600; }
.stepper li.current::before { background: var(--accent); }

/* ---------- page ---------- */

.page { max-width: 880px; margin: 0 auto; padding: 32px 16px 64px; }
.loading { color: var(--muted); padding: 48px 0; text-align: center; }
.lead { font-size: 17px; color: var(--muted); margin-bottom: 24px; }

.card {
  background: var(--surface); border: 1px solid var(--line); border-radius: var(--radius);
  box-shadow: var(--shadow); padding: 24px; margin-bottom: 16px;
}
.card.dim { opacity: .55; }
.card-head { display: flex; justify-content: space-between; align-items: baseline; gap: 12px; flex-wrap: wrap; }

.consent { max-height: 52vh; overflow: auto; padding-right: 8px; }
.consent h2 { font-size: 18px; }
.consent ul { padding-left: 20px; }
.facts { display: grid; grid-template-columns: max-content 1fr; gap: 4px 16px; margin: 12px 0 16px; font-size: 15px; }
.facts dt { color: var(--muted); }
.facts dd { margin: 0; }

.actions { display: flex; gap: 10px; flex-wrap: wrap; align-items: center; margin-top: 20px; }

/* ---------- buttons and inputs ---------- */

button, .btn {
  font: inherit; font-size: 15px; font-weight: 600;
  border-radius: 10px; padding: 10px 18px; cursor: pointer;
  border: 1px solid var(--line); background: var(--surface); color: var(--fg);
  text-decoration: none; display: inline-flex; align-items: center; gap: 8px;
  transition: background .12s, border-color .12s, transform .05s;
}
button:hover, .btn:hover { border-color: var(--muted); }
button:active, .btn:active { transform: translateY(1px); }
button:disabled { opacity: .45; cursor: not-allowed; transform: none; }
.primary { background: var(--accent); border-color: var(--accent); color: var(--accent-fg); }
.primary:hover { filter: brightness(1.06); border-color: var(--accent); }
.ghost { background: transparent; }
.link { background: none; border: none; padding: 0; color: var(--accent); font-weight: 500; }
.small-btn { padding: 6px 12px; font-size: 14px; }

input[type="text"], select, textarea {
  font: inherit; color: var(--fg); background: var(--surface);
  border: 1px solid var(--line); border-radius: 10px; padding: 10px 12px; width: 100%;
}
textarea { font: 14px/1.55 ui-monospace, SFMono-Regular, Menlo, monospace; resize: vertical; min-height: 220px; }
input:focus, select:focus, textarea:focus, button:focus-visible {
  outline: 2px solid var(--accent); outline-offset: 1px;
}

/* ---------- screening ---------- */

.question { padding: 18px 0; border-top: 1px solid var(--line); }
.question:first-of-type { border-top: none; padding-top: 4px; }
.question legend { font-weight: 600; padding: 0; margin-bottom: 4px; }
.question fieldset { border: none; padding: 0; margin: 0; }
.question .help { font-size: 14px; color: var(--muted); margin-bottom: 10px; }
.options { display: grid; gap: 8px; margin-top: 8px; }
.option {
  display: flex; gap: 10px; align-items: center; padding: 10px 14px;
  border: 1px solid var(--line); border-radius: 10px; cursor: pointer; background: var(--surface);
}
.option:hover { border-color: var(--muted); }
.option:has(input:checked) { border-color: var(--accent); background: var(--accent-soft); }
.option input { accent-color: var(--accent); margin: 0; }
.error { color: var(--bad); font-size: 14px; margin-top: 8px; }

/* ---------- install ---------- */

.steps { counter-reset: s; list-style: none; padding: 0; margin: 16px 0 0; display: grid; gap: 14px; }
.steps > li { counter-increment: s; display: grid; grid-template-columns: 32px 1fr; gap: 12px; align-items: start; }
.steps > li::before {
  content: counter(s); width: 28px; height: 28px; border-radius: 50%;
  background: var(--accent-soft); color: var(--accent); font-weight: 700; font-size: 14px;
  display: grid; place-items: center;
}
.steps .sub { color: var(--muted); font-size: 14px; }
code.kbd {
  font: 13px ui-monospace, Menlo, monospace; background: var(--surface-2); border: 1px solid var(--line);
  padding: 2px 6px; border-radius: 6px;
}

.status {
  display: flex; align-items: center; gap: 10px; padding: 12px 16px; border-radius: 12px;
  background: var(--surface-2); margin-top: 20px; font-weight: 500;
}
.status .dot { width: 10px; height: 10px; border-radius: 50%; background: var(--muted); flex: none; }
.status.waiting .dot { animation: pulse 1.4s ease-in-out infinite; }
.status.ok { background: var(--ok-soft); color: var(--ok); }
.status.ok .dot { background: var(--ok); }
.status.bad { background: var(--bad-soft); color: var(--bad); }
.status.bad .dot { background: var(--bad); }
@keyframes pulse { 50% { opacity: .25; } }

/* ---------- task ---------- */

.pill {
  display: inline-flex; align-items: center; gap: 6px; font-size: 13px; font-weight: 600;
  padding: 3px 10px; border-radius: 999px; background: var(--surface-2); color: var(--muted); white-space: nowrap;
}
.pill.P { background: var(--p-soft); color: var(--p); }
.pill.T { background: var(--t-soft); color: var(--t); }
.pill.ok { background: var(--ok-soft); color: var(--ok); }

.prompt {
  margin: 14px 0 0; padding: 14px 16px; border-radius: 12px; background: var(--surface-2);
  border-left: 3px solid var(--accent); font-size: 17px; white-space: pre-wrap;
}
.prompt.long { max-height: 180px; overflow: auto; font-size: 14px; }

.rounds { list-style: none; padding: 0; margin: 14px 0 0; display: grid; gap: 6px; }
.rounds li { display: flex; align-items: center; gap: 6px; font-size: 14px; color: var(--muted); }
.rounds li.now { color: var(--fg); font-weight: 600; }
.rounds li.done::before { content: "✓"; color: var(--ok); font-weight: 700; }
.progress { display: flex; gap: 6px; margin-top: 14px; }
.progress span { flex: 1; height: 6px; border-radius: 3px; background: var(--line); }
.progress span.done { background: var(--ok); }
.progress span.now { background: var(--accent); animation: pulse 1.4s ease-in-out infinite; }

.answer { border: 1px solid var(--line); border-radius: 12px; padding: 16px; margin-top: 16px; background: var(--surface); }
.answer-head { display: flex; justify-content: space-between; align-items: center; gap: 8px; margin-bottom: 10px; }
.answer-head h3 { margin: 0; }
.note { border-radius: 10px; padding: 10px 14px; font-size: 14px; margin-bottom: 10px; }
.note.warn { background: var(--warn-soft); color: var(--warn); }
.note.info { background: var(--accent-soft); color: var(--accent); }
.tools { display: flex; gap: 8px; flex-wrap: wrap; align-items: center; margin-top: 8px; }
.check { display: flex; gap: 8px; align-items: flex-start; font-size: 14px; margin-top: 10px; cursor: pointer; }
.check input { margin-top: 4px; accent-color: var(--accent); }
.selfreport { border: 1px solid var(--line); border-radius: 10px; padding: 10px 14px; margin: 12px 0 0; }
.selfreport legend { font-size: 14px; font-weight: 600; padding: 0 4px; }
.answer.needs-attention { border-color: var(--bad); box-shadow: 0 0 0 3px var(--bad-soft); }

.done-mark { display: grid; place-items: center; width: 56px; height: 56px; border-radius: 50%; background: var(--ok-soft); color: var(--ok); font-size: 28px; margin-bottom: 12px; }


@media (max-width: 600px) {
  .card { padding: 18px; }
  h1 { font-size: 24px; }
  .stepper li:not(.current) { display: none; }
}

/* ---------- task screens ---------- */

.kicker { font-size: 13px; font-weight: 600; letter-spacing: .04em; text-transform: uppercase; color: var(--muted); margin: 0 0 4px; }

.journey { display: flex; align-items: center; justify-content: space-between; gap: 16px; flex-wrap: wrap; margin-bottom: 28px; }
.journey-q { display: flex; gap: 6px; }
.journey-q span { width: 28px; height: 6px; border-radius: 3px; background: var(--line); }
.journey-q span.done { background: var(--ok); }
.journey-q span.now { background: var(--accent); }
.journey-steps { display: flex; gap: 4px; list-style: none; margin: 0; padding: 0; flex-wrap: wrap; }
.journey-steps li { font-size: 13px; color: var(--muted); padding: 3px 10px; border-radius: 999px; border: 1px solid var(--line); }
.journey-steps li.done { color: var(--ok); border-color: transparent; background: var(--ok-soft); }
.journey-steps li.done::before { content: "✓ "; }
.journey-steps li.now { color: var(--accent); border-color: var(--accent); font-weight: 600; }

.mode-card { border-left-width: 5px; }
.mode-card.P { border-left-color: var(--p); background: linear-gradient(90deg, var(--p-soft), var(--surface) 40%); }
.mode-card.T { border-left-color: var(--t); background: linear-gradient(90deg, var(--t-soft), var(--surface) 40%); }
.mode-head { display: flex; align-items: center; gap: 10px; margin-bottom: 10px; flex-wrap: wrap; }
.mode-card .pill { font-size: 14px; padding: 4px 12px; }

.note.ok { background: var(--ok-soft); color: var(--ok); }
button.big, .btn.big { font-size: 16px; padding: 12px 22px; }

.summary { list-style: none; padding: 0; margin: 0; display: grid; gap: 10px; }
.summary li { display: flex; align-items: center; gap: 6px; flex-wrap: wrap; }

/* ---------- install steps ---------- */

.install-step { display: grid; gap: 20px; }
.shot { margin: 0; border-radius: 12px; overflow: hidden; border: 1px solid var(--line); background: #f1f3f4; }
.shot img { display: block; width: 100%; height: auto; }
.install-text p { margin-bottom: 12px; }
code.kbd.big { font-size: 15px; padding: 6px 10px; }
.trouble { margin-top: 16px; font-size: 14px; }
.trouble summary { cursor: pointer; color: var(--accent); font-weight: 500; }
.trouble ul { margin: 8px 0 0; padding-left: 20px; display: grid; gap: 6px; }

/* ---------- survey ---------- */

.question.missing { border-radius: 10px; box-shadow: 0 0 0 2px var(--bad); padding-left: 12px; padding-right: 12px; }
.qtext { margin-bottom: 4px; }
.scale-row { display: flex; gap: 6px; margin-top: 10px; }
.scale-pt { flex: 1; cursor: pointer; }
.scale-pt input { position: absolute; opacity: 0; pointer-events: none; }
.scale-pt span {
  display: grid; place-items: center; height: 40px; border-radius: 10px; border: 1px solid var(--line);
  background: var(--surface); font-weight: 600;
}
.scale-pt:hover span { border-color: var(--muted); }
.scale-pt input:checked + span { border-color: var(--accent); background: var(--accent-soft); color: var(--accent); }
.scale-pt input:focus-visible + span { outline: 2px solid var(--accent); }
.scale-labels { display: grid; grid-template-columns: 1fr 1fr 1fr; font-size: 13px; color: var(--muted); margin-top: 6px; }
.scale-labels span:nth-child(2) { text-align: center; }
.scale-labels span:last-child { text-align: right; }

.slider { margin-top: 10px; }
/* A plain track with no "filled" part, so an untouched slider doesn't look
   like an answer of 50; the handle appears once the participant moves it. */
.slider input[type="range"] {
  -webkit-appearance: none; appearance: none; width: 100%; height: 22px; background: transparent; cursor: pointer;
}
.slider input[type="range"]::-webkit-slider-runnable-track { height: 6px; border-radius: 3px; background: var(--line); }
.slider input[type="range"]::-moz-range-track { height: 6px; border-radius: 3px; background: var(--line); }
.slider input[type="range"]::-webkit-slider-thumb {
  -webkit-appearance: none; width: 20px; height: 20px; margin-top: -7px; border-radius: 50%;
  background: var(--accent); border: 3px solid var(--surface); box-shadow: 0 0 0 1px var(--accent);
}
.slider input[type="range"]::-moz-range-thumb {
  width: 16px; height: 16px; border-radius: 50%; background: var(--accent); border: 3px solid var(--surface);
}
.slider input[type="range"].unset::-webkit-slider-thumb { opacity: 0; }
.slider input[type="range"].unset::-moz-range-thumb { opacity: 0; }
.slider input[type="range"]:focus-visible { outline: 2px solid var(--accent); outline-offset: 4px; border-radius: 4px; }
.slider-ends { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; font-size: 13px; color: var(--muted); margin-bottom: 6px; }
.slider-ends span:last-child { text-align: right; }
.slider-ends.short { margin: 4px 0 0; }
.slider-val { font-weight: 600; color: var(--fg); }

.checked-list { margin: 14px 0 6px; padding-left: 20px; display: grid; gap: 4px; }

input.zip { width: 9em; font-size: 18px; letter-spacing: .08em; }