/* Class Spark — teacher-facing UI.
   Warm, high-contrast, large type. Sized for a phone held one-handed at the
   front of a classroom as much as for a laptop. */

:root {
  --accent: #c2571f;
  --accent-dark: #9c4416;
  --accent-soft: #fdefe4;
  --accent-line: #f0cfb4;

  --ink: #2a211c;
  --ink-soft: #6b5d54;
  --page: #fdfaf6;
  --card: #ffffff;
  --line: #e8ddd3;

  --danger: #a32c2c;
  --radius: 14px;
  --shadow: 0 1px 2px rgba(42, 33, 28, .06), 0 6px 20px rgba(42, 33, 28, .07);
}

*, *::before, *::after { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--page);
  color: var(--ink);
  font-family: "Segoe UI", system-ui, -apple-system, "Helvetica Neue", sans-serif;
  font-size: 17px;
  line-height: 1.6;
  -webkit-text-size-adjust: 100%;
}

.wrap { width: min(920px, 100% - 2rem); margin-inline: auto; }

.visually-hidden {
  position: absolute; width: 1px; height: 1px;
  padding: 0; margin: -1px; overflow: hidden;
  clip: rect(0 0 0 0); white-space: nowrap; border: 0;
}

/* ---------------------------------------------------------------- header */

.site-header {
  background: linear-gradient(160deg, var(--accent) 0%, var(--accent-dark) 100%);
  color: #fff;
  padding: 2rem 0 2.25rem;
}
.site-header h1 {
  margin: 0;
  font-size: clamp(1.9rem, 5vw, 2.6rem);
  letter-spacing: -.02em;
}
.tagline {
  margin: .4rem 0 0;
  font-size: clamp(1rem, 2.5vw, 1.15rem);
  opacity: .93;
  max-width: 34ch;
}

/* ------------------------------------------------------------------ form */

.panel {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: clamp(1.1rem, 3vw, 1.75rem);
  margin-top: -1.25rem;
  position: relative;
}

.grid { display: grid; gap: 1rem; grid-template-columns: 1fr 1fr; }
.grid-3 { grid-template-columns: 1fr 1fr 1fr; }
@media (max-width: 820px) { .grid-3 { grid-template-columns: 1fr 1fr; } }
@media (max-width: 620px) {
  .grid, .grid-3 { grid-template-columns: 1fr; }
}

/* Worksheet-only fields, revealed when that activity type is chosen. */
.subpanel {
  margin: 1.15rem 0;
  padding: 1rem 1.1rem;
  background: var(--accent-soft);
  border: 1.5px solid var(--accent-line);
  border-radius: 12px;
}
.subpanel h3 { margin: 0 0 .2rem; font-size: 1.05rem; }
.subpanel > .hint { margin-bottom: .9rem; }
.subpanel .field:last-of-type { margin-bottom: 0; }
.subpanel input { background: #fff; }

.field { margin-bottom: 1.15rem; border: 0; padding: 0; }
.field:last-of-type { margin-bottom: 0; }

label, legend {
  display: block;
  font-weight: 650;
  margin-bottom: .35rem;
  font-size: 1rem;
}
legend { padding: 0; }
.req-note { font-weight: 400; color: var(--ink-soft); font-size: .9rem; }

input[type="text"], input[type="number"], select {
  width: 100%;
  padding: .7rem .8rem;
  font: inherit;
  color: inherit;
  background: #fff;
  border: 1.5px solid var(--line);
  border-radius: 10px;
  min-height: 46px; /* comfortable tap target */
}
input:focus-visible, select:focus-visible, button:focus-visible, summary:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 2px;
}

.hint { margin: .35rem 0 0; font-size: .9rem; color: var(--ink-soft); }

/* Activity-type chips: checkboxes styled as large toggles. */
.chips { display: flex; flex-wrap: wrap; gap: .5rem; }
.chip {
  display: inline-flex; align-items: center; gap: .45rem;
  padding: .55rem .85rem;
  border: 1.5px solid var(--line);
  border-radius: 999px;
  background: #fff;
  cursor: pointer;
  user-select: none;
  font-size: .97rem;
  transition: background .12s, border-color .12s;
}
.chip:hover { border-color: var(--accent-line); }
.chip input { accent-color: var(--accent); width: 1.05rem; height: 1.05rem; margin: 0; }
.chip:has(input:checked) {
  background: var(--accent-soft);
  border-color: var(--accent);
  font-weight: 600;
}

.optional { margin: 1.15rem 0; }
.optional summary {
  cursor: pointer;
  font-weight: 600;
  padding: .4rem 0;
  color: var(--accent-dark);
}
.optional > .grid { margin-top: .75rem; }

.actions { margin-top: 1.35rem; }

/* --------------------------------------------------------------- buttons */

.btn {
  font: inherit;
  font-weight: 600;
  border-radius: 10px;
  border: 1.5px solid transparent;
  padding: .7rem 1.15rem;
  cursor: pointer;
  min-height: 46px;
  transition: background .12s, border-color .12s, color .12s;
}
.btn[disabled] { opacity: .6; cursor: progress; }

.btn-primary {
  background: var(--accent);
  color: #fff;
  width: 100%;
  font-size: 1.08rem;
}
.btn-primary:hover:not([disabled]) { background: var(--accent-dark); }

.btn-ghost {
  background: #fff;
  border-color: var(--line);
  color: var(--ink);
}
.btn-ghost:hover { border-color: var(--accent); color: var(--accent-dark); }
.btn-danger:hover { border-color: var(--danger); color: var(--danger); }

.btn-small { padding: .45rem .8rem; min-height: 38px; font-size: .93rem; }

.error {
  margin: 1rem 0 0;
  padding: .8rem 1rem;
  background: #fdeceb;
  border: 1.5px solid #f0b7b3;
  border-radius: 10px;
  color: #8c2820;
}

/* --------------------------------------------------------------- results */

.section-head {
  display: flex; align-items: baseline; justify-content: space-between;
  gap: 1rem; flex-wrap: wrap;
  margin: 2.5rem 0 1rem;
}
.section-head h2 { margin: 0; font-size: 1.5rem; }
.section-tools { display: flex; gap: .5rem; }
.count { color: var(--ink-soft); font-weight: 400; font-size: 1rem; }

.cards { display: grid; gap: 1rem; }

.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-left: 5px solid var(--accent);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  padding: 1.15rem 1.25rem;
}
.card.is-busy { opacity: .55; }

.card-head {
  display: flex; justify-content: space-between; align-items: flex-start; gap: .75rem;
}
.card-title { margin: 0; font-size: 1.22rem; line-height: 1.3; }
.card-meta {
  margin: .4rem 0 0;
  display: flex; align-items: center; gap: .55rem; flex-wrap: wrap;
  font-size: .9rem; color: var(--ink-soft);
}
.badge {
  background: var(--accent-soft);
  color: var(--accent-dark);
  border: 1px solid var(--accent-line);
  border-radius: 999px;
  padding: .12rem .6rem;
  font-weight: 600;
  font-size: .84rem;
}

.star {
  background: none; border: 0; cursor: pointer;
  font-size: 1.6rem; line-height: 1; color: var(--ink-soft);
  padding: .15rem .3rem; border-radius: 8px;
}
.star[aria-pressed="true"] { color: var(--accent); }

.card-steps { margin: 1rem 0 0; padding-left: 1.3rem; }
.card-steps li { margin-bottom: .5rem; }

.card-materials, .card-diff { margin-top: 1rem; }
.card h4 {
  margin: 0 0 .2rem;
  font-size: .82rem;
  text-transform: uppercase;
  letter-spacing: .06em;
  color: var(--ink-soft);
}
.card-materials p, .card-diff p { margin: 0; }
.card-diff { background: var(--accent-soft); border-radius: 10px; padding: .8rem .9rem; }

.card-actions {
  display: flex; gap: .5rem; flex-wrap: wrap;
  margin-top: 1.15rem; padding-top: .9rem;
  border-top: 1px solid var(--line);
}

/* ------------------------------------------------------- worksheet card */

.card-worksheet { border-left-color: #2f6f8f; }

.poster-preview {
  margin-top: 1rem;
  padding: 1rem 1.1rem;
  background: #fff;
  border: 2px solid #2f6f8f;
  border-radius: 10px;
}
.poster-preview .ws-body {
  margin: 0;
  white-space: pre-wrap;   /* the model's paragraph breaks are meaningful */
  line-height: 1.65;
}
.ws-event {
  margin: .9rem 0 0;
  display: grid;
  grid-template-columns: max-content 1fr;
  gap: .2rem .9rem;
  padding: .7rem .85rem;
  background: #eaf2f6;
  border-radius: 8px;
  font-size: .95rem;
}
.ws-event:empty { display: none; }
.ws-event dt { font-weight: 700; }
.ws-event dd { margin: 0; }

.ws-questions { margin-top: 1rem; }
.ws-questions h4 {
  margin: 0 0 .35rem;
  font-size: .82rem;
  text-transform: uppercase;
  letter-spacing: .06em;
  color: var(--ink-soft);
}
.ws-questions ol { margin: 0; padding-left: 1.3rem; }
.ws-questions li { margin-bottom: .5rem; }

.btn-pdf { border-color: #2f6f8f; color: #24576f; }
.btn-pdf:hover:not([disabled]) { background: #eaf2f6; }

/* Skeleton placeholders while generating. */
.skeleton { border-left-color: var(--line); }
.skeleton .bar {
  height: 1rem; border-radius: 6px; margin-bottom: .6rem;
  background: linear-gradient(90deg, #efe7df 25%, #f7f2ec 50%, #efe7df 75%);
  background-size: 200% 100%;
  animation: shimmer 1.3s infinite;
}
.skeleton .bar.w60 { width: 60%; }
.skeleton .bar.w80 { width: 80%; }
@keyframes shimmer { to { background-position: -200% 0; } }
@media (prefers-reduced-motion: reduce) { .skeleton .bar { animation: none; } }

.empty {
  margin: 2rem 0;
  color: var(--ink-soft);
  font-size: .95rem;
  text-align: center;
}

.site-footer {
  margin-top: 3rem; padding: 1.5rem 0 2.5rem;
  border-top: 1px solid var(--line);
  color: var(--ink-soft); font-size: .9rem;
}

/* ----------------------------------------------------------------- print */

@media print {
  /* Teachers print these to carry into class — strip everything interactive
     and force high-contrast ink on white. */
  .no-print, .site-header, .site-footer, .panel { display: none !important; }

  body { background: #fff; font-size: 11.5pt; }
  .wrap { width: 100%; }

  .card {
    box-shadow: none;
    border: 1px solid #999;
    border-left: 3px solid #333;
    break-inside: avoid;      /* never split an activity across pages */
    page-break-inside: avoid;
    margin-bottom: .6rem;
  }
  .card-diff { background: #f2f2f2; }
  .badge { background: none; border: 1px solid #999; color: #000; }
  .section-head { margin: 0 0 .75rem; }

  /* Print one section at a time without losing the other from the DOM. */
  body.printing-results #favourites-section,
  body.printing-favourites #results-section { display: none !important; }
}