/* ── Variables ────────────────────────────────────────────────────────────── */
:root {
  --bg: #f4f6fb;
  --surface: #ffffff;
  --surface2: #eef0f8;
  --border: #dde1f0;
  --text: #1a1f3d;
  --muted: #6b75a0;
  --accent: #4f7cff;
  --accent-light: #2563eb;
  --error: #dc2626;
  --success: #16a34a;
  --radius: 12px;
  --shadow: 0 2px 16px rgba(79,124,255,0.08), 0 1px 4px rgba(0,0,0,0.06);
  --font: 'IBM Plex Sans', sans-serif;
}

/* ── Reset ───────────────────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  font-size: 16px;
  line-height: 1.6;
}
h1, h2, h3 { font-family: var(--font); font-weight: 600; line-height: 1.2; }
a { color: var(--accent); }
p { margin-bottom: 0.75rem; }
p:last-child { margin-bottom: 0; }

/* ── Screens ─────────────────────────────────────────────────────────────── */
.screen { display: none; min-height: 100vh; }
.screen.active { display: block; }

.screen-inner {
  max-width: 760px;
  margin: 0 auto;
  padding: 2rem 1.25rem 4rem;
}
.screen-inner.centered {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 100vh;
  padding: 2rem 1.25rem;
}

/* ── Card ────────────────────────────────────────────────────────────────── */
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 2.5rem 2rem;
  box-shadow: var(--shadow);
  width: 100%;
}
.card.centered-text { text-align: center; }
.card h1 { font-size: 2rem; margin-bottom: 0.5rem; }
.card h2 { font-size: 1.5rem; margin-bottom: 1rem; }
.card h3 { font-size: 1.15rem; margin-bottom: 0.75rem; }

/* ── Buttons ─────────────────────────────────────────────────────────────── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 1.75rem;
  border: none;
  border-radius: 8px;
  font-family: var(--font);
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  transition: opacity 0.15s, transform 0.1s, box-shadow 0.15s;
  text-decoration: none;
}
.btn:active { transform: scale(0.97); }
.btn:disabled { opacity: 0.35; cursor: not-allowed; transform: none; }
.btn-primary {
  background: var(--accent);
  color: #fff;
  box-shadow: 0 2px 8px rgba(79,124,255,0.3);
}
.btn-primary:hover:not(:disabled) { opacity: 0.88; box-shadow: 0 4px 14px rgba(79,124,255,0.4); }
.btn-ghost {
  background: transparent;
  color: var(--muted);
  border: 1px solid var(--border);
}
.btn-ghost:hover:not(:disabled) { background: var(--surface2); color: var(--text); }
.btn-large { padding: 1rem 2.5rem; font-size: 1.1rem; }

/* ── Study badge ─────────────────────────────────────────────────────────── */
.study-badge {
  display: inline-block;
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 0.25rem 0.9rem;
  font-size: 0.82rem;
  color: var(--muted);
  margin-bottom: 1rem;
  font-weight: 600;
}

/* ── Consent ─────────────────────────────────────────────────────────────── */
.consent-card { max-width: 680px; }
.consent-card h1 { font-size: 1.8rem; margin-bottom: 1.5rem; }
.consent-body {
  white-space: pre-line;
  color: var(--text);
  margin-bottom: 2rem;
  font-size: 0.95rem;
  line-height: 1.7;
  background: var(--surface2);
  border-radius: 8px;
  padding: 1.25rem;
  border: 1px solid var(--border);
}
.consent-actions { display: flex; gap: 1rem; flex-wrap: wrap; }

/* ── Instructions ────────────────────────────────────────────────────────── */
.instruction-body {
  white-space: pre-line;
  color: var(--text);
  margin-bottom: 1.5rem;
  line-height: 1.8;
}
.action-icons-preview {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.75rem;
  margin-bottom: 2rem;
  background: var(--surface2);
  border-radius: 8px;
  padding: 1.25rem;
  border: 1px solid var(--border);
}
.icon-row { display: flex; align-items: center; gap: 0.75rem; font-size: 0.95rem; }
.icon-demo {
  width: 2.2rem; height: 2.2rem;
  border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  font-size: 1rem; flex-shrink: 0;
}
.icon-demo.like    { background: rgba(79,124,255,0.12); }
.icon-demo.dislike { background: rgba(220,38,38,0.1); }
.icon-demo.share   { background: rgba(22,163,74,0.12); }
.icon-demo.flag    { background: rgba(202,138,4,0.12); }

/* ── Demographics ────────────────────────────────────────────────────────── */
.muted { color: var(--muted); font-size: 0.9rem; margin-bottom: 1.5rem; }
.form-group { margin-bottom: 1.75rem; }
.form-group > label {
  display: block;
  font-weight: 600;
  margin-bottom: 0.75rem;
  font-size: 0.95rem;
}
.radio-group { display: flex; flex-direction: column; gap: 0.5rem; }
.radio-option {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  padding: 0.65rem 1rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  cursor: pointer;
  transition: border-color 0.15s, background 0.15s;
  font-size: 0.95rem;
}
.radio-option:hover { border-color: var(--accent); background: rgba(79,124,255,0.04); }
.radio-option input[type="radio"] { accent-color: var(--accent); width: 1rem; height: 1rem; }
.radio-option input[type="checkbox"] { accent-color: var(--accent); width: 1rem; height: 1rem; }
.radio-option:has(input:checked) {
  border-color: var(--accent);
  background: rgba(79,124,255,0.07);
}
/* Freeform demographic inputs (input_type='text' / 'number'). Without this
   rule the input renders as a stock browser control — visually
   inconsistent with the radio-option style used by every other demographic
   question. Match the radio container's padding, border, and focus states
   so the screen reads as a single coherent form. */
.demo-input {
  display: block;
  width: 100%;
  padding: 0.65rem 1rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 8px;
  font: inherit;
  color: inherit;
  transition: border-color 0.15s, background 0.15s;
  box-sizing: border-box;
}
.demo-input:hover  { border-color: var(--accent); background: rgba(79,124,255,0.04); }
.demo-input:focus  { outline: none; border-color: var(--accent); background: rgba(79,124,255,0.07); }
/* Highlight when the value is outside the researcher-set min/max bounds
   (or the type='number' has non-numeric input). :invalid is HTML5's own
   constraint validation hook — pairs with the minlength/maxlength/min/max
   attributes set by the participant render. */
.demo-input:not(:placeholder-shown):invalid { border-color: #ef4444; }
/* Hide the browser's native number-input spinner — researchers don't need
   the up/down arrows cluttering the field; participants type values
   directly. */
.demo-input[type="number"]::-webkit-outer-spin-button,
.demo-input[type="number"]::-webkit-inner-spin-button { -webkit-appearance: none; margin: 0; }
.demo-input[type="number"] { -moz-appearance: textfield; }
.demo-input-hint { font-size: 0.78rem; color: var(--muted); margin-top: 0.35rem; }
.field-hint { font-size: 0.82rem; color: var(--muted); margin-top: 0.75rem; }

/* ── Transition screens ───────────────────────────────────────────────────── */
.big-emoji { font-size: 3.5rem; margin-bottom: 1rem; line-height: 1; }
.centered-text p { color: var(--muted); margin-bottom: 1rem; max-width: 480px; margin-left: auto; margin-right: auto; }
.centered-text .btn { margin-top: 1rem; }
.transition-body { white-space: pre-line; color: var(--muted); margin-bottom: 1.5rem; line-height: 1.7; font-size: 0.97rem; }

/* ── Progress bar (sticky) ───────────────────────────────────────────────── */
.progress-sticky {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  padding: 0.75rem 1.25rem;
  box-shadow: 0 1px 6px rgba(0,0,0,0.06);
}
.progress-label {
  font-size: 0.85rem;
  color: var(--muted);
  margin-bottom: 0.5rem;
  text-align: center;
  font-weight: 600;
}
.progress-track {
  height: 5px;
  background: var(--surface2);
  border-radius: 3px;
  overflow: hidden;
}
.progress-fill {
  height: 100%;
  background: var(--accent);
  border-radius: 3px;
  transition: width 0.35s ease;
  width: 0%;
}

/* ── Feed ────────────────────────────────────────────────────────────────── */
.feed-container {
  max-width: 620px;
  margin: 0 auto;
  padding: 1.5rem 1.25rem;
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}
.feed-footer {
  display: none;
  position: sticky;
  bottom: 0;
  background: linear-gradient(0deg, var(--bg) 60%, transparent);
  padding: 1.5rem 1.25rem;
  text-align: center;
  z-index: 50;
}
.feed-footer.visible { display: block; }

/* ── Post card ───────────────────────────────────────────────────────────── */
.feed-post {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
  transition: border-color 0.2s, box-shadow 0.2s;
}
.feed-post.reacted {
  border-color: var(--accent);
  box-shadow: 0 2px 16px rgba(79,124,255,0.12);
}

.post-header {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  padding: 1rem 1rem 0.5rem;
}
.post-avatar {
  width: 40px; height: 40px;
  border-radius: 50%;
  background: var(--surface2);
  border: 1px solid var(--border);
  display: flex; align-items: center; justify-content: center;
  font-weight: 700;
  font-size: 0.8rem;
  color: var(--accent);
  flex-shrink: 0;
}
.post-avatar-img { object-fit: cover; padding: 0; }
.post-meta { flex: 1; min-width: 0; }
.post-source { font-weight: 700; font-size: 0.9rem; }
.post-handle { font-size: 0.8rem; color: var(--muted); }

.topic-pill {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  padding: 0.2rem 0.65rem;
  border-radius: 20px;
  font-size: 0.75rem;
  font-weight: 600;
  white-space: nowrap;
  flex-shrink: 0;
}
.topic-zdrowie  { background: #fee2e2; color: #b91c1c; }
.topic-klimat   { background: #dcfce7; color: #15803d; }
.topic-polityka { background: #dbeafe; color: #1d4ed8; }
.topic-ekonomia { background: #fef9c3; color: #a16207; }
.topic-nauka    { background: #f3e8ff; color: #7e22ce; }

.post-body { padding: 0 1rem 0.75rem; }
.post-headline {
  font-size: 1rem;
  font-weight: 700;
  line-height: 1.35;
  margin-bottom: 0.5rem;
  color: var(--text);
}
.post-content { font-size: 0.9rem; color: var(--muted); line-height: 1.6; }

.post-image { width: 100%; max-height: 280px; overflow: hidden; background: var(--surface2); }
.post-image img { width: 100%; height: 100%; object-fit: cover; display: block; }

.post-metrics {
  display: flex;
  gap: 1rem;
  padding: 0.6rem 1rem;
  border-top: 1px solid var(--border);
  border-bottom: 1px solid var(--border);
  font-size: 0.82rem;
  background: var(--surface2);
}
.metric { display: flex; align-items: center; gap: 0.3rem; }
.metric.high { color: var(--accent-light); font-weight: 600; }
.metric.low  { color: var(--muted); }

/* ── Post comments (builder) ─────────────────────────────────────────────── */
.post-comments-list {
  border-top: 1px solid var(--border);
  padding: 0.6rem 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}
.post-comment-item {
  display: flex;
  gap: 0.6rem;
  align-items: flex-start;
}
.post-comment-avatar {
  flex-shrink: 0;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--accent);
  color: #fff;
  font-size: 0.65rem;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
}
.post-comment-body {
  display: flex;
  flex-direction: column;
  gap: 0.1rem;
  font-size: 0.82rem;
}
.post-comment-author {
  font-weight: 700;
  color: var(--text);
}
.post-comment-text {
  color: var(--text);
  line-height: 1.4;
}
.post-comment-likes {
  font-size: 0.75rem;
  color: var(--muted);
  margin-top: 0.15rem;
}

.post-actions {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
}
.action-btn {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.2rem;
  padding: 0.75rem 0.5rem;
  background: transparent;
  border: none;
  color: var(--muted);
  cursor: pointer;
  font-size: 0.78rem;
  font-family: var(--font);
  transition: color 0.15s, background 0.15s;
  border-top: 1px solid var(--border);
}
.action-btn:not(:last-child) { border-right: 1px solid var(--border); }
.action-btn .action-icon { font-size: 1.2rem; }
.action-btn:hover { background: var(--surface2); color: var(--text); }
.action-btn.active-like    { color: var(--accent);  background: rgba(79,124,255,0.08); }
.action-btn.active-dislike { color: var(--error);   background: rgba(220,38,38,0.07); }
.action-btn.active-share   { color: var(--success); background: rgba(22,163,74,0.07); }
.action-btn.active-flag    { color: #ca8a04;        background: rgba(202,138,4,0.07); }

/* ── Rating screen ───────────────────────────────────────────────────────── */
.rating-card { max-width: 660px; }
.rating-post-meta {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-wrap: wrap;
  margin-bottom: 1rem;
  padding-bottom: 1rem;
  border-bottom: 1px solid var(--border);
}
.rating-source { font-weight: 700; font-size: 0.95rem; }
.rating-handle { color: var(--muted); font-size: 0.85rem; }
.rating-headline { font-size: 1.1rem; font-weight: 600; margin-bottom: 0.75rem; line-height: 1.4; }
.rating-content { color: var(--muted); font-size: 0.9rem; margin-bottom: 1.75rem; line-height: 1.6; }

/* ── Likert ──────────────────────────────────────────────────────────────── */
.likert-section { margin-bottom: 1.5rem; }
.likert-question { font-weight: 600; margin-bottom: 1rem; font-size: 0.95rem; }
.likert-labels {
  display: flex;
  justify-content: space-between;
  font-size: 0.78rem;
  color: var(--muted);
  margin-bottom: 0.5rem;
}
.likert-buttons {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  gap: 0.4rem;
}
.likert-number-labels {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  font-size: 0.72rem;
  color: var(--muted);
  text-align: center;
  margin-top: 0.3rem;
}
.likert-btn {
  aspect-ratio: 1;
  border: 2px solid var(--border);
  border-radius: 8px;
  background: var(--surface2);
  color: var(--muted);
  font-family: var(--font);
  font-weight: 700;
  font-size: 1rem;
  cursor: pointer;
  transition: border-color 0.15s, background 0.15s, color 0.15s, transform 0.1s;
}
.likert-btn:hover { border-color: var(--lc, var(--accent)); background: var(--surface); }
.likert-btn:active { transform: scale(0.95); }

/* All values share the same accent color (blue). The previous red→yellow→green
 * ramp implied a valence (1=bad, 5=good) which biased Likert items where the
 * scale represents a neutral construct (e.g. "language tone: 1 neutral …
 * 10 emotional"). Uniform color keeps the scale visually neutral so the
 * meaning is conveyed purely by the anchor labels at the ends. */
.likert-btn.selected { background: var(--accent); border-color: var(--accent); color: #fff; }
.likert-btn:not(.selected):hover { color: var(--accent); border-color: var(--accent); }

/* ── Paged screen ────────────────────────────────────────────────────────── */
#screen-paged .screen-inner { padding: 0 1.25rem; }

.paged-outer {
  width: 100%;
  max-width: 660px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 1rem;
  padding: 1.5rem 0 3rem;
}

.paged-card {
  padding: 0;
  overflow: hidden;
}
.paged-card .post-header  { padding: 1.25rem 1.25rem 0.75rem; }
.paged-card .post-body    { padding: 0 1.25rem 0.75rem; }
.paged-card .post-metrics { padding: 0.6rem 1.25rem; }

/* Researcher comment block inside the white card */
.post-comment-divider {
  border-top: 1px solid var(--border);
}
.post-comment-entry {
  display: flex;
  gap: 0.65rem;
  padding: 0.85rem 1.25rem;
}
.post-comment-avatar {
  width: 28px; height: 28px;
  border-radius: 50%;
  background: var(--surface2);
  border: 1px solid var(--border);
  display: flex; align-items: center; justify-content: center;
  font-weight: 700;
  font-size: 0.65rem;
  color: var(--muted);
  flex-shrink: 0;
}
.post-comment-body { flex: 1; min-width: 0; }
.post-comment-author {
  font-weight: 700;
  font-size: 0.8rem;
  color: var(--text);
  display: block;
  margin-bottom: 0.15rem;
}
.post-comment-text {
  font-size: 0.85rem;
  color: var(--muted);
  line-height: 1.55;
  margin-bottom: 0;
}

/* Likert outside the card */
.paged-rating-section {
  background: transparent;
  padding: 0.5rem 0.25rem;
}
.paged-rating-section .likert-question {
  font-size: 0.92rem;
  font-weight: 600;
  margin-bottom: 0.75rem;
  color: var(--text);
}
.paged-rating-section .likert-labels {
  display: flex;
  justify-content: space-between;
  font-size: 0.75rem;
  color: var(--muted);
  margin-bottom: 0.5rem;
}
.paged-rating-section .likert-buttons {
  display: flex;
  gap: 0.4rem;
}
.paged-rating-section .likert-btn {
  flex: 1;
  aspect-ratio: unset;
  height: 46px;
  font-size: 0.88rem;
}

/* Participant comment input — lives INSIDE .paged-card as a FB-style
 * comment composer strip at the bottom of the post. Top border acts as
 * visual separator from the action buttons row above. Lives in the same
 * card as the post → automatically hidden when the card is hidden (e.g.
 * during the after_post questions full-screen takeover). */
.paged-card #paged-participant-comment-wrap {
  border-top: 1px solid var(--border);
  margin-top: 0.5rem;
  padding: 0.75rem 1rem 0;
}
/* Feed-mode comment composer — same FB-style strip pattern as paged.
 * Sits inside .feed-post (the per-post card in the scrolling feed) so it
 * reads as part of the post and lives/dies with the card. */
.feed-post .feed-participant-comment-wrap {
  border-top: 1px solid var(--border);
  margin-top: 0.5rem;
  padding: 0.75rem 1rem;
}
.feed-post .feed-comment-input {
  width: 100%;
  font-family: var(--font);
  font-size: 0.88rem;
  color: var(--text);
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 0.55rem 0.9rem;
  resize: vertical;
  min-height: 40px;
  line-height: 1.4;
  box-sizing: border-box;
  transition: border-color 0.15s, background 0.15s;
}
.feed-post .feed-comment-input:focus {
  outline: none;
  border-color: var(--accent);
  background: var(--surface);
}
.paged-comment-area {
  width: 100%;
  font-family: var(--font);
  font-size: 0.9rem;
  color: var(--text);
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 20px;
  padding: 0.6rem 1rem;
  resize: vertical;
  min-height: 44px;
  line-height: 1.4;
  transition: border-color 0.15s, background 0.15s;
  display: block;
  box-sizing: border-box;
}
.paged-card .paged-comment-area {
  background: var(--surface2);
  min-height: 44px;
}
.paged-comment-area:focus {
  outline: none;
  border-color: var(--accent);
  background: var(--surface);
}

/* Navigation below likert */
.paged-nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
}

/* ── Debrief ─────────────────────────────────────────────────────────────── */
.debrief-card { max-width: 760px; }
.debrief-header { text-align: center; margin-bottom: 2rem; }
.debrief-header h1 { font-size: 1.8rem; }
.debrief-section { margin-bottom: 2rem; }
.debrief-section h3 {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--accent);
  margin-bottom: 0.75rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--border);
}
.debrief-section p, .debrief-text-block {
  color: var(--muted);
  font-size: 0.92rem;
  line-height: 1.7;
  white-space: pre-line;
}
.debrief-post-item {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  padding: 0.75rem;
  border-radius: 8px;
  background: var(--surface2);
  border: 1px solid var(--border);
  margin-bottom: 0.5rem;
}
.debrief-truth-badge {
  display: inline-block;
  padding: 0.2rem 0.6rem;
  border-radius: 6px;
  font-size: 0.72rem;
  font-weight: 700;
  white-space: nowrap;
  flex-shrink: 0;
}
.badge-true  { background: #dcfce7; color: #15803d; }
.badge-false { background: #fee2e2; color: #b91c1c; }
.debrief-post-headline { font-size: 0.88rem; line-height: 1.4; }
.debrief-contact {
  text-align: center;
  padding-top: 1.5rem;
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 0.9rem;
}

/* ── Camera consent note ─────────────────────────────────────────────────── */
.camera-consent-note {
  background: var(--surface2);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1rem 1.25rem;
  margin: 1.25rem 0;
  font-size: 0.88rem;
}
.camera-consent-note ul {
  margin: 0.5rem 0 0 1.25rem;
  color: var(--muted);
  line-height: 1.7;
}
.camera-consent-note p { margin-bottom: 0; }

/* ── Calibration screen ──────────────────────────────────────────────────── */
#screen-calibration { background: #0f1023; }
.calibration-outer {
  position: relative;
  width: 100%;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
}
.cal-instructions {
  position: relative;
  z-index: 5;
  color: #c8ceee;
  text-align: center;
  padding: 2rem 1.5rem 1rem;
  font-size: 1rem;
  line-height: 1.6;
  max-width: 480px;
}
.cal-instructions button { margin-top: 0.5rem; }
#cal-dots-wrap {
  position: fixed;
  inset: 0;
  pointer-events: none;
  z-index: 4;
}
.cal-dot {
  position: absolute;
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: #4f7cff;
  border: 3px solid #fff;
  transform: translate(-50%, -50%);
  cursor: pointer;
  pointer-events: auto;
  display: flex;
  align-items: center;
  justify-content: center;
  animation: calPulse 1.4s ease-in-out infinite;
  transition: transform 0.15s, background 0.2s;
}
.cal-dot:hover { transform: translate(-50%, -50%) scale(1.25); }
.cal-dot.done {
  background: #16a34a;
  border-color: #bbf7d0;
  animation: none;
  transform: translate(-50%, -50%) scale(0.7);
  pointer-events: none;
}
.cal-dot.cal-dot-validation {
  background: #f59e0b;
  border-color: #fde68a;
  cursor: default;
  pointer-events: none;
  animation: none;
}
@keyframes calPulse {
  0%, 100% { box-shadow: 0 0 0 0 rgba(79,124,255,0.6); }
  50% { box-shadow: 0 0 0 12px rgba(79,124,255,0); }
}
.cal-progress-bar-outer {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  height: 5px;
  background: rgba(255,255,255,0.08);
  z-index: 10;
}
.cal-progress-bar-fill {
  height: 100%;
  background: #4f7cff;
  transition: width 0.3s ease;
  width: 0%;
}

/* Hide all WebGazer-injected UI elements */
#webgazerVideoFeed, #webgazerVideoCanvas,
#webgazerFaceOverlay, #webgazerFaceFeedbackBox,
#webgazerPredictionPoints { display: none !important; }

/* ── Responsive ──────────────────────────────────────────────────────────── */
@media (max-width: 600px) {
  .card { padding: 1.5rem 1.25rem; }
  /* Keep all four reaction buttons (Lubię / Nie lubię / Udostępnij / Zgłoś)
     in a single horizontal row on mobile — the 2×2 grid the override used
     to force was burning twice the vertical space and pushing the comment
     box / Dalej button off-screen on shorter phones. Tighter padding +
     smaller font keep the longest label ("Udostępnij") readable inside
     the narrower column. */
  .post-actions { grid-template-columns: repeat(4, 1fr); }
  .action-btn { padding: 0.6rem 0.25rem; font-size: 0.7rem; gap: 0.15rem; }
  .action-btn .action-icon { font-size: 1.05rem; }
  .action-icons-preview { grid-template-columns: 1fr; }
  .consent-actions { flex-direction: column; }
  .consent-actions .btn { width: 100%; }
  .likert-btn { font-size: 0.85rem; }
  .paged-nav { flex-direction: column-reverse; gap: 0.75rem; }
  .paged-nav .btn { width: 100%; }
  /* Post-question Likert on phones — tighten gap + drop horizontal padding
     so a 10-point scale fits the viewport without overflow. minmax(0, 1fr)
     on the grid (set inline in renderPostQuestion) already lets columns
     shrink; these reductions just give each cell more room to breathe its
     number inside the smaller width. */
  .post-questions-inner { padding: 1.25rem 0.9rem; }
  .post-questions-block .likert-buttons { gap: 0.25rem; }
  .post-questions-block .likert-btn { font-size: 0.78rem; padding: 0 0.15rem; }
}

/* ── Post questions (builder mode) ──────────────────────────────────────── */
.post-questions-block {
  margin: 0.5rem 0 1rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  overflow: hidden;
  transition: opacity 0.3s;
}
.post-questions-inner { padding: 1.5rem; }
/* Optional title + subtitle at the top of the questions block, mirroring the
   demographics screen header */
.pq-screen-title    { font-size: 1.35rem; font-weight: 700; margin: 0 0 0.4rem; color: var(--text); }
.pq-screen-subtitle { font-size: 0.9rem; color: var(--muted); margin: 0 0 1.5rem; line-height: 1.5; }
/* Each question wraps in .pq-q + .form-group so spacing matches demographics
   (1.75rem between questions). The inline `margin-bottom:0` override was
   removed from renderPostQuestion so the default form-group spacing applies. */
.pq-q { margin-bottom: 0; }
.pq-req { color: var(--danger, #ef4444); margin-left: 0.15rem; }
.pq-response { width: 100%; padding: 0.5rem 0.65rem; border: 1px solid var(--border); border-radius: 7px; font-family: inherit; font-size: 0.9rem; resize: vertical; background: var(--surface2, #f9fafb); color: var(--text); }
.pq-response:focus { outline: none; border-color: var(--primary); }
.pq-opt { display: flex; align-items: center; gap: 0.5rem; padding: 0.3rem 0; font-size: 0.9rem; cursor: pointer; }
.pq-opt input { cursor: pointer; }
.pq-submit-btn { margin-top: 0.75rem; width: 100%; transition: opacity 0.2s, background 0.2s; }
.pq-submit-btn:disabled { opacity: 0.4; cursor: not-allowed; }
#paged-post-questions { margin-top: 0.75rem; }
/* Likert description shown BELOW the scale (per researcher request) */
.pq-likert-description { font-size: 0.82rem; color: var(--muted, #6b7280); margin: 0.6rem 0 0; line-height: 1.5; font-style: italic; }
/* Likert inside post-questions blocks — rectangles spanning the full row width
   so that .likert-labels ("min" on the left, "max" on the right) line up with
   the edges of the scale. Buttons are fixed-height rectangles that flex with
   the available width, which scales smoothly down to phones. */
.post-questions-block .likert-buttons {
  gap: 0.35rem;
}
.post-questions-block .likert-btn {
  aspect-ratio: auto;       /* override the global square */
  height: 44px;             /* consistent visual weight across viewports */
  min-width: 0;             /* allow grid columns to shrink on narrow screens */
  padding: 0;
  font-size: 0.9rem;
  border-radius: 7px;
  border-width: 1.5px;
}

/* ── Post-question modal (pq_display_mode = 'after_interaction_modal') ────
 * Opens after the participant reacts to a post. The post card stays visible
 * (dimmed) so re-reading the post while answering is possible. Dismissed
 * via the .pq-submit-btn inside the modal — see submitPostQuestionsInline
 * which detects the .pq-modal-backdrop ancestor and closes itself. We
 * deliberately do NOT close on backdrop click because required questions
 * would silently lose state. */
.pq-modal-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(15, 23, 42, 0.55);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1.25rem;
  z-index: 1000;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.2s ease, visibility 0s linear 0.2s;
}
.pq-modal-backdrop.open {
  opacity: 1;
  visibility: visible;
  transition: opacity 0.2s ease, visibility 0s linear 0s;
}
.pq-modal-card {
  background: var(--surface);
  border-radius: 12px;
  box-shadow: 0 24px 64px rgba(0, 0, 0, 0.28);
  width: 100%;
  max-width: 560px;
  max-height: 90vh;
  overflow-y: auto;
  padding: 1.25rem 1.5rem 1.5rem;
  transform: translateY(8px);
  transition: transform 0.2s ease;
}
.pq-modal-backdrop.open .pq-modal-card {
  transform: translateY(0);
}
.pq-modal-body .post-questions-block {
  margin: 0;
  padding: 0;
  background: transparent;
  border: none;
}
.pq-modal-body .pq-screen-title {
  margin-top: 0;
}
.pq-modal-body .pq-submit-btn {
  margin-top: 0.5rem;
}
@media (max-width: 640px) {
  .pq-modal-backdrop { padding: 0; align-items: flex-end; }
  .pq-modal-card {
    border-radius: 16px 16px 0 0;
    max-height: 88vh;
    transform: translateY(100%);
  }
  .pq-modal-backdrop.open .pq-modal-card { transform: translateY(0); }
}

/* ── Part requirements checklist (Phase 3) ────────────────────────────────
 * Sticky card under the paged progress bar showing the structured interaction
 * requirements for the current part. Items flip from "○" to "✓" as the
 * participant satisfies counts. Only rendered when the part defines a
 * `requirements: [...]` array — fully invisible otherwise. */
.part-checklist {
  margin: 0.75rem auto 0;
  max-width: 720px;
  padding: 0.7rem 1rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 10px;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.04);
  font-size: 0.88rem;
}
.part-checklist-title {
  font-weight: 600;
  font-size: 0.85rem;
  color: var(--muted);
  margin-bottom: 0.4rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}
.part-checklist-items {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
}
.part-checklist-items li {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  color: var(--text);
  transition: color 0.2s;
}
.part-checklist-items li.met { color: var(--success, #16a34a); }
.part-checklist-check {
  font-weight: 700;
  font-size: 1.05rem;
  width: 1.2rem;
  text-align: center;
  color: var(--muted);
}
.part-checklist-items li.met .part-checklist-check { color: var(--success, #16a34a); }
.part-checklist-label { flex: 1; }
.part-checklist-count {
  font-variant-numeric: tabular-nums;
  font-weight: 600;
  font-size: 0.82rem;
  color: var(--muted);
  background: var(--surface2);
  padding: 0.1rem 0.5rem;
  border-radius: 12px;
}
.part-checklist-items li.met .part-checklist-count {
  color: var(--success, #16a34a);
  background: rgba(22, 163, 74, 0.10);
}