body.ws {
  background: var(--bg-soft);
}

/* ---------- top bar ---------- */
.ws-bar {
  background: #000000;
  color: #fff;
  padding: 14px 0;
}
.ws-bar__inner {
  max-width: 880px;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}
.ws-bar__brand {
  display: flex;
  align-items: center;
  gap: 12px;
  font-weight: 700;
}
.ws-bar__brand img {
  height: 30px;
  width: auto;
}
.ws-bar__actions {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}
.ws-bar a,
.ws-bar button {
  font-family: var(--font);
  font-size: 0.9rem;
  font-weight: 700;
  border-radius: 999px;
  padding: 9px 18px;
  cursor: pointer;
  border: none;
  text-decoration: none;
}
.ws-bar .ws-back {
  background: transparent;
  color: #fff;
  box-shadow: inset 0 0 0 2px rgba(255, 255, 255, 0.7);
}
.ws-bar .ws-print {
  background: #fff;
  color: #000000;
}

/* ---------- sheet ---------- */
.sheet {
  max-width: 880px;
  margin: 28px auto 60px;
  padding: 0 24px;
}
.sheet__head {
  margin-bottom: 8px;
}
.sheet__eyebrow {
  font-family: var(--mono);
  font-size: 0.8rem;
  letter-spacing: 0.08em;
  color: var(--coral);
  text-transform: uppercase;
  margin: 0 0 4px;
}
.sheet h1 {
  font-size: clamp(1.6rem, 4vw, 2.2rem);
  font-weight: 800;
  margin: 0 0 6px;
}
.sheet__sub {
  color: var(--ink-60);
  margin: 0 0 24px;
}

/* identity row */
.idrow {
  display: grid;
  grid-template-columns: 1fr 1fr 1fr;
  gap: 14px;
  margin-bottom: 26px;
}
.idrow label {
  display: flex;
  flex-direction: column;
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--ink-60);
  gap: 5px;
}

/* ---------- step blocks (POE) ---------- */
.step {
  background: #fff;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 24px 26px;
  margin-bottom: 20px;
}
.step__tag {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 4px 12px;
  border-radius: 999px;
  margin-bottom: 12px;
}
.step__tag--predict {
  background: var(--coral-light);
  color: #b23b3b;
}
.step__tag--observe {
  background: var(--teal-light);
  color: #0e6b69;
}
.step__tag--explain {
  background: #e6ecf5;
  color: #000000;
}
.step h2 {
  font-size: 1.25rem;
  font-weight: 700;
  margin: 0 0 6px;
}
.step p.guide {
  color: var(--ink-60);
  font-size: 0.95rem;
  margin: 0 0 16px;
}

/* ---------- form fields ---------- */
input[type="text"],
textarea {
  font-family: var(--font);
  font-size: 0.98rem;
  color: var(--ink);
  width: 100%;
  border: 1.5px solid #d6e4e3;
  border-radius: 8px;
  padding: 9px 12px;
  background: var(--bg-soft);
}
input[type="text"]:focus,
textarea:focus {
  outline: none;
  border-color: var(--teal);
  background: #fff;
}
textarea {
  resize: vertical;
  min-height: 90px;
  line-height: 1.5;
}
.field-inline {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin: 0 16px 12px 0;
  font-weight: 600;
}
.field-inline input {
  width: 140px;
}

/* ---------- data tables ---------- */
.ws-table {
  width: 100%;
  border-collapse: collapse;
  margin: 6px 0 4px;
}
.ws-table th {
  text-align: left;
  font-size: 0.82rem;
  font-weight: 700;
  color: var(--ink-60);
  padding: 8px 10px;
  border-bottom: 2px solid var(--teal-light);
}
.ws-table td {
  padding: 6px 8px;
  border-bottom: 1px solid #eef2f1;
  vertical-align: middle;
}
.ws-table input[type="text"] {
  border: 1px solid #d6e4e3;
  padding: 7px 10px;
}
.ws-table td.fixed {
  font-weight: 600;
  color: var(--ink);
  background: #fff;
}

/* prediction tick options */
.ticks {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin: 4px 0 14px;
}
.tick {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 1rem;
  cursor: pointer;
}
.tick input {
  width: 18px;
  height: 18px;
  accent-color: var(--teal);
}

.hint {
  font-size: 0.85rem;
  color: var(--ink-60);
  font-style: italic;
  margin-top: 4px;
}

/* ---------- print ---------- */
@media print {
  * {
    -webkit-print-color-adjust: exact;
    print-color-adjust: exact;
  }
  body.ws {
    background: #fff;
  }
  .ws-bar,
  .ws-foot-actions {
    display: none;
  }
  .sheet {
    margin: 0 auto;
    max-width: 100%;
  }
  .step {
    box-shadow: none;
    border: 1px solid #ccc;
    break-inside: avoid;
  }

  /* make typed text visible */
  input[type="text"],
  textarea {
    background: #fff !important;
    color: #000 !important;
    border: 1px solid #999 !important;
    -webkit-text-fill-color: #000 !important;
  }
  textarea {
    min-height: 70px;
  }

  /* make radio/checkbox labels visible */
  .tick {
    color: #000;
  }

  a[href]:after {
    content: "";
  }
}

@media (max-width: 640px) {
  .idrow {
    grid-template-columns: 1fr;
  }
}

/* ---------- bottom actions ---------- */
.ws-foot-actions {
  display: flex;
  justify-content: center;
  margin: 10px 0 40px;
}
.ws-foot-actions .btn {
  background: #000000;
}

/* ============================================================
   Interactive prediction styles
   Used in activity-1 through activity-6 worksheets
   ============================================================ */

/* click-to-select option buttons (Activity 1) */
.pred-options {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin: 14px 0 6px;
}
.pred-opt {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 14px 18px;
  border-radius: 10px;
  background: var(--bg-soft);
  border: 2px solid transparent;
  cursor: pointer;
  font-size: 1rem;
  font-family: var(--font);
  font-weight: 500;
  color: var(--ink);
  transition:
    background 0.12s,
    border-color 0.12s;
  text-align: left;
  width: 100%;
}
.pred-opt:hover {
  background: var(--teal-light);
}
.pred-opt.selected {
  background: var(--teal-light);
  border-color: var(--teal);
  font-weight: 700;
}
.pred-opt .pred-letter {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: #fff;
  font-weight: 700;
  font-size: 0.85rem;
  border: 2px solid #ccc;
  transition:
    background 0.12s,
    border-color 0.12s;
}
.pred-opt.selected .pred-letter {
  background: var(--teal);
  border-color: var(--teal);
  color: #fff;
}
.pred-locked .pred-opt:not(.selected) {
  opacity: 0.45;
  pointer-events: none;
}
.pred-locked .pred-opt.selected {
  cursor: default;
}
.pred-lock-btn {
  margin-top: 12px;
  font-family: var(--font);
  background: var(--coral);
  color: #fff;
  border: none;
  border-radius: 999px;
  padding: 11px 26px;
  font-weight: 700;
  font-size: 0.95rem;
  cursor: pointer;
}
.pred-lock-btn:disabled {
  background: #ccc;
  cursor: default;
}
.pred-confirmed {
  display: none;
  margin-top: 10px;
  padding: 10px 16px;
  background: var(--coral-light);
  border-radius: 8px;
  font-size: 0.9rem;
  font-weight: 600;
  color: #7a2020;
}
.pred-confirmed.show {
  display: block;
}

/* drag-and-drop ranking (Activity 2) */
.rank-list {
  list-style: none;
  padding: 0;
  margin: 14px 0;
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.rank-item {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 13px 16px;
  border-radius: 10px;
  background: var(--bg-soft);
  cursor: grab;
  font-weight: 500;
  user-select: none;
  transition:
    background 0.12s,
    box-shadow 0.12s;
}
.rank-item:active {
  cursor: grabbing;
}
.rank-item.dragging {
  opacity: 0.4;
  box-shadow: var(--shadow-lg);
}
.rank-item.drag-over {
  background: var(--teal-light);
}
.rank-num {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--teal);
  color: #fff;
  font-weight: 700;
  font-size: 0.85rem;
}
.rank-handle {
  color: #aaa;
  font-size: 1.1rem;
  cursor: grab;
}
.rank-locked .rank-item {
  cursor: default;
  pointer-events: none;
}
.rank-locked .rank-handle {
  display: none;
}

/* interactive radio (Activities 3 to 6) */
.iradio-group {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin: 14px 0;
}
.iradio {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 13px 18px;
  border-radius: 10px;
  background: var(--bg-soft);
  cursor: pointer;
  font-size: 1rem;
  font-family: var(--font);
  font-weight: 500;
  border: 2px solid transparent;
  transition:
    background 0.12s,
    border-color 0.12s;
}
.iradio:hover {
  background: var(--teal-light);
}
.iradio.selected {
  background: var(--teal-light);
  border-color: var(--teal);
  font-weight: 700;
}
.iradio input[type="radio"] {
  width: 18px;
  height: 18px;
  accent-color: var(--teal);
  flex-shrink: 0;
}
.iradio-group[aria-disabled="true"] .iradio {
  cursor: default;
}

/* confidence rating (Activity 4) */
.conf-group {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin: 14px 0;
}
.conf-btn {
  padding: 10px 20px;
  border-radius: 999px;
  border: 2px solid #d6e4e3;
  background: var(--bg-soft);
  font-family: var(--font);
  font-weight: 600;
  font-size: 0.95rem;
  cursor: pointer;
  transition:
    background 0.12s,
    border-color 0.12s;
}
.conf-btn:hover {
  background: var(--coral-light);
  border-color: var(--coral);
}
.conf-btn.selected {
  background: var(--coral-light);
  border-color: var(--coral);
  color: #7a2020;
}

@media print {
  .pred-lock-btn,
  .rank-handle {
    display: none;
  }
  .pred-opt,
  .rank-item,
  .iradio {
    border: 1px solid #ccc;
  }
  .pred-opt.selected,
  .iradio.selected,
  .rank-item {
    background: #f5f5f5 !important;
  }
}

/* ---------- prediction summary box ---------- */
.pred-summary {
  display: none;
  margin-top: 20px;
  background: #fff;
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 22px 24px;
}
.pred-summary.show {
  display: block;
}
.pred-summary h4 {
  font-size: 1rem;
  font-weight: 700;
  margin: 0 0 14px;
  color: var(--ink);
}
.pred-summary__list {
  list-style: none;
  padding: 0;
  margin: 0;
}
.pred-summary__list li {
  padding: 10px 0;
  border-top: 1px solid #eef2f1;
  font-size: 0.95rem;
}
.pred-summary__list li:first-child {
  border-top: none;
}
.pred-summary__q {
  color: var(--ink-60);
  font-size: 0.85rem;
  display: block;
  margin-bottom: 2px;
}
.pred-summary__a {
  font-weight: 700;
  color: var(--ink);
}
.pred-summary__note {
  margin-top: 14px;
  font-size: 0.88rem;
  color: var(--ink-60);
  font-style: italic;
}

/* ---------- activity hero illustration ---------- */
.sheet__hero-img {
  display: block;
  height: 160px;
  max-height: 160px;
  width: auto;
  max-width: 220px;
  object-fit: contain;
  margin: 0 0 22px;
}

/* ---------- detector-image analysis (Activity 6) ---------- */
.post-prediction[hidden],
.observation-gate[hidden] {
  display: none;
}
.observation-gate {
  text-align: center;
  border: 2px dashed #b8d8d6;
  box-shadow: none;
}
.observation-gate .guide {
  max-width: 580px;
  margin: 0 auto !important;
}
.image-analysis-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
  margin: 18px 0 12px;
}
.image-analysis-card {
  min-width: 0;
  margin: 0;
  overflow: hidden;
  border: 1.5px solid #d6e4e3;
  border-radius: 10px;
  background: var(--bg-soft);
}
.image-analysis-card img {
  display: block;
  width: 100%;
  aspect-ratio: 1;
  object-fit: contain;
  background: #fff;
  border-bottom: 1.5px solid #d6e4e3;
}
.image-analysis-card figcaption {
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding: 11px 12px;
}
.image-analysis-card__label {
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  color: var(--coral);
  text-transform: uppercase;
}
.ws-table-wrap {
  overflow-x: auto;
  margin-top: 16px;
}
.image-analysis-table {
  min-width: 720px;
}
.analysis-question {
  margin-top: 20px !important;
  margin-bottom: 8px !important;
}
.cer-prompt {
  margin-top: 18px;
  padding: 16px 18px;
  border-left: 4px solid var(--teal);
  border-radius: 0 8px 8px 0;
  background: var(--bg-soft);
}
.cer-prompt > strong {
  color: var(--teal);
}
.cer-prompt p {
  margin: 4px 0 10px;
  color: var(--ink-60);
  font-size: 0.95rem;
}

@media (max-width: 720px) {
  .image-analysis-grid {
    grid-template-columns: 1fr;
  }
  .image-analysis-card {
    max-width: 480px;
    width: 100%;
    margin-inline: auto;
  }
}