/* ==========================================================================
   Projects SOLVE-ALONG — styles for the guided worked-example card.
   Companion to projects-solve.js. Scoped under body.pro-projects, reuses each
   unit's accent vars (--navy/--blue/--teal/--gold/--green). Additive,
   reduced-motion aware, and hidden in print (it is a practice aid, and its
   "Your Turn" solution must never leak into a submitted report).
   ========================================================================== */

body.pro-projects .sa-card {
  margin: 18px 0 6px;
  border: 2px solid var(--teal, #0f766e);
  border-radius: 18px;
  background:
    radial-gradient(120% 90% at 100% 0%, rgba(15, 118, 110, 0.09), transparent 60%),
    linear-gradient(180deg, rgba(15, 118, 110, 0.05), rgba(255, 255, 255, 0.65));
  padding: 15px 17px 16px;
  box-shadow: 0 10px 26px -20px rgba(15, 118, 110, 0.65);
}

body.pro-projects .sa-head {
  display: flex;
  align-items: flex-start;
  gap: 11px;
  margin-bottom: 8px;
}
body.pro-projects .sa-icon {
  font-size: 1.55rem;
  line-height: 1.1;
}
body.pro-projects .sa-titles {
  display: grid;
  gap: 1px;
}
body.pro-projects .sa-kicker {
  color: var(--teal, #0f766e);
  font-size: 0.68rem;
  font-weight: 900;
  letter-spacing: 0.11em;
  text-transform: uppercase;
}
body.pro-projects .sa-title {
  margin: 0;
  font-size: 1.06rem;
  color: var(--navy, #10243e);
}
body.pro-projects .sa-badge {
  margin-left: auto;
  align-self: center;
  font-size: 0.66rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--teal, #0f766e);
  border: 1.5px solid currentColor;
  border-radius: 999px;
  padding: 3px 10px;
  white-space: nowrap;
}
body.pro-projects .sa-prompt {
  margin: 2px 0 12px;
  padding: 10px 13px;
  border-left: 4px solid var(--gold, #d69e2e);
  border-radius: 4px 12px 12px 4px;
  background: rgba(214, 158, 46, 0.09);
  color: var(--navy, #10243e);
  font-size: 0.97rem;
}

body.pro-projects .sa-steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
}
body.pro-projects .sa-step {
  display: grid;
  grid-template-columns: 30px 1fr;
  gap: 11px;
  align-items: start;
  padding: 11px 13px;
  border: 1px solid rgba(15, 118, 110, 0.28);
  border-radius: 13px;
  background: #fff;
}
body.pro-projects .sa-step-num {
  display: grid;
  place-items: center;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  background: var(--teal, #0f766e);
  color: #fff;
  font-weight: 900;
  font-size: 0.92rem;
}
body.pro-projects .sa-step-body {
  display: grid;
  gap: 4px;
}
body.pro-projects .sa-do {
  margin: 0;
  font-weight: 700;
  color: var(--navy, #10243e);
  font-size: 0.95rem;
}
body.pro-projects .sa-math {
  margin: 1px 0;
  padding: 6px 10px;
  border-radius: 8px;
  background: rgba(23, 99, 199, 0.08);
  color: var(--blue, #1763c7);
  font-family: "Courier New", ui-monospace, monospace;
  font-size: 1.02rem;
  font-weight: 700;
  letter-spacing: 0.01em;
  overflow-x: auto;
}
body.pro-projects .sa-why {
  margin: 0;
  color: var(--muted, #54677c);
  font-size: 0.9rem;
}

body.pro-projects .sa-sr {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
}

body.pro-projects .sa-answer {
  margin: 12px 0 4px;
  padding: 11px 13px;
  border-radius: 12px;
  background: linear-gradient(120deg, rgba(22, 163, 74, 0.12), rgba(22, 163, 74, 0.04));
  border: 1px solid rgba(22, 163, 74, 0.4);
  color: var(--navy, #10243e);
  font-weight: 700;
  font-size: 0.98rem;
}

body.pro-projects .sa-predict {
  margin: 12px 0 2px;
  font-size: 0.86rem;
  font-style: italic;
  color: var(--teal, #0f766e);
}
body.pro-projects .sa-controls {
  display: flex;
  flex-wrap: wrap;
  gap: 9px;
  margin: 8px 0 4px;
}
body.pro-projects .sa-btn {
  font: inherit;
  font-weight: 800;
  cursor: pointer;
  border-radius: 10px;
  padding: 9px 16px;
  border: 1.5px solid var(--teal, #0f766e);
  background: var(--teal, #0f766e);
  color: #fff;
  transition:
    transform 0.12s ease,
    box-shadow 0.12s ease,
    background 0.12s ease;
}
body.pro-projects .sa-btn:hover {
  transform: translateY(-1px);
  box-shadow: 0 8px 18px -12px rgba(15, 118, 110, 0.9);
}
body.pro-projects .sa-btn:focus-visible {
  outline: 3px solid rgba(15, 118, 110, 0.35);
  outline-offset: 2px;
}
body.pro-projects .sa-btn:disabled {
  opacity: 0.55;
  cursor: default;
  transform: none;
  box-shadow: none;
}
body.pro-projects .sa-btn-ghost {
  background: transparent;
  color: var(--teal, #0f766e);
}
body.pro-projects .sa-note {
  margin: 8px 0 0;
  font-size: 0.78rem;
  color: var(--muted, #54677c);
  font-style: italic;
}

/* ---- Your Turn self-check --------------------------------------------- */
body.pro-projects .sa-yt {
  margin-top: 14px;
  padding: 13px 14px;
  border-radius: 14px;
  border: 1.5px dashed var(--blue, #1763c7);
  background: rgba(23, 99, 199, 0.05);
}
body.pro-projects .sa-yt-kicker {
  margin: 0 0 6px;
  color: var(--blue, #1763c7);
  font-size: 0.72rem;
  font-weight: 900;
  letter-spacing: 0.09em;
  text-transform: uppercase;
}
body.pro-projects .sa-yt-ask {
  margin: 0 0 10px;
  color: var(--navy, #10243e);
  font-size: 0.96rem;
  font-weight: 600;
}
body.pro-projects .sa-yt-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
}
body.pro-projects .sa-yt-input {
  flex: 1 1 150px;
  min-width: 120px;
  font: inherit;
  padding: 9px 11px;
  border: 1.5px solid #b9c8dd;
  border-radius: 10px;
  background: #fff;
  color: #172033;
}
body.pro-projects .sa-yt-input:focus-visible {
  outline: 3px solid rgba(23, 99, 199, 0.25);
  border-color: var(--blue, #1763c7);
}
body.pro-projects .sa-yt-input.is-correct {
  border-color: var(--green, #16a34a);
  background: rgba(22, 163, 74, 0.08);
}
body.pro-projects .sa-btn-check {
  border-color: var(--blue, #1763c7);
  background: var(--blue, #1763c7);
}
body.pro-projects .sa-btn-check:hover {
  box-shadow: 0 8px 18px -12px rgba(23, 99, 199, 0.9);
}
body.pro-projects .sa-yt-feedback {
  margin: 10px 0 0;
  font-size: 0.94rem;
  font-weight: 700;
  min-height: 1.2em;
}
body.pro-projects .sa-yt-feedback.is-correct {
  color: var(--green, #16a34a);
}
body.pro-projects .sa-yt-feedback.is-close {
  color: var(--gold, #b7791f);
}
body.pro-projects .sa-yt-feedback.is-wrong {
  color: #c0392b;
}
body.pro-projects .sa-solution {
  margin: 12px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 9px;
}
body.pro-projects .sa-solution .sa-step {
  border-color: rgba(23, 99, 199, 0.3);
}
body.pro-projects .sa-solution .sa-step-num {
  background: var(--blue, #1763c7);
}

/* Reveal animation (motion-safe). */
@keyframes saReveal {
  from {
    opacity: 0;
    transform: translateY(6px);
  }
  to {
    opacity: 1;
    transform: none;
  }
}
body.pro-projects .sa-step.is-revealing {
  animation: saReveal 0.32s ease both;
}
@media (prefers-reduced-motion: reduce) {
  body.pro-projects .sa-step.is-revealing {
    animation: none;
  }
  body.pro-projects .sa-btn {
    transition: none;
  }
}

@media (max-width: 620px) {
  body.pro-projects .sa-badge {
    display: none;
  }
  body.pro-projects .sa-yt-input {
    flex-basis: 100%;
  }
}

/* ---- Practice-set mastery meter --------------------------------------- */
body.pro-projects .sa-meter {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 2px 0 12px;
}
body.pro-projects .sa-meter-track {
  display: flex;
  gap: 6px;
}
body.pro-projects .sa-meter-dot {
  width: 22px;
  height: 8px;
  border-radius: 999px;
  background: rgba(23, 99, 199, 0.2);
  transition: background 0.2s ease;
}
body.pro-projects .sa-meter-dot.is-done {
  background: var(--green, #16a34a);
}
body.pro-projects .sa-meter-label {
  font-size: 0.76rem;
  font-weight: 800;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--muted, #54677c);
}
body.pro-projects .sa-item + .sa-item {
  margin-top: 12px;
}
body.pro-projects .sa-item-nav {
  margin-top: 10px;
}
body.pro-projects .sa-btn-next {
  border-color: var(--green, #16a34a);
  background: var(--green, #16a34a);
}
body.pro-projects .sa-alldone {
  margin: 6px 0 0;
  padding: 10px 13px;
  border-radius: 10px;
  background: rgba(22, 163, 74, 0.12);
  border: 1px solid rgba(22, 163, 74, 0.4);
  color: var(--navy, #10243e);
  font-weight: 800;
}

/* ---- Error-analysis "Spot the Mistake" card --------------------------- */
body.pro-projects .ea-card {
  margin: 18px 0 6px;
  border: 2px solid var(--gold, #d69e2e);
  border-radius: 18px;
  background:
    radial-gradient(120% 90% at 0% 0%, rgba(214, 158, 46, 0.1), transparent 60%),
    linear-gradient(180deg, rgba(214, 158, 46, 0.05), rgba(255, 255, 255, 0.65));
  padding: 15px 17px 16px;
  box-shadow: 0 10px 26px -20px rgba(183, 121, 31, 0.7);
}
body.pro-projects .ea-head {
  display: flex;
  align-items: flex-start;
  gap: 11px;
  margin-bottom: 8px;
}
body.pro-projects .ea-icon {
  font-size: 1.55rem;
  line-height: 1.1;
}
body.pro-projects .ea-titles {
  display: grid;
  gap: 1px;
}
body.pro-projects .ea-kicker {
  color: var(--gold, #b7791f);
  font-size: 0.68rem;
  font-weight: 900;
  letter-spacing: 0.11em;
  text-transform: uppercase;
}
body.pro-projects .ea-title {
  margin: 0;
  font-size: 1.06rem;
  color: var(--navy, #10243e);
}
body.pro-projects .ea-badge {
  margin-left: auto;
  align-self: center;
  font-size: 0.66rem;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--gold, #b7791f);
  border: 1.5px solid currentColor;
  border-radius: 999px;
  padding: 3px 10px;
  white-space: nowrap;
}
body.pro-projects .ea-prompt {
  margin: 2px 0 8px;
  color: var(--navy, #10243e);
  font-size: 0.97rem;
}
body.pro-projects .ea-instruct {
  margin: 0 0 10px;
  font-weight: 700;
  color: var(--navy, #10243e);
  font-size: 0.93rem;
}
body.pro-projects .ea-steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 9px;
}
body.pro-projects .ea-step {
  display: grid;
  grid-template-columns: 28px 1fr;
  gap: 11px;
  align-items: center;
  width: 100%;
  text-align: left;
  padding: 11px 13px;
  border: 1.5px solid rgba(214, 158, 46, 0.4);
  border-radius: 13px;
  background: #fff;
  font: inherit;
  cursor: pointer;
  transition:
    border-color 0.14s ease,
    background 0.14s ease,
    transform 0.1s ease;
}
body.pro-projects .ea-step:hover {
  border-color: var(--gold, #d69e2e);
  transform: translateY(-1px);
}
body.pro-projects .ea-step:focus-visible {
  outline: 3px solid rgba(214, 158, 46, 0.35);
  outline-offset: 2px;
}
body.pro-projects .ea-step:disabled {
  cursor: default;
  transform: none;
}
body.pro-projects .ea-step-num {
  display: grid;
  place-items: center;
  width: 26px;
  height: 26px;
  border-radius: 50%;
  background: var(--gold, #b7791f);
  color: #fff;
  font-weight: 900;
  font-size: 0.9rem;
}
body.pro-projects .ea-step-body {
  display: grid;
  gap: 2px;
}
body.pro-projects .ea-math {
  font-family: "Courier New", ui-monospace, monospace;
  font-size: 1.02rem;
  font-weight: 700;
  color: var(--navy, #10243e);
}
body.pro-projects .ea-note {
  font-size: 0.85rem;
  color: var(--muted, #54677c);
}
body.pro-projects .ea-step.is-flaw {
  border-color: #c0392b;
  background: rgba(192, 57, 43, 0.09);
}
body.pro-projects .ea-step.is-flaw .ea-step-num {
  background: #c0392b;
}
body.pro-projects .ea-step.is-flaw .ea-math {
  color: #c0392b;
  text-decoration: line-through 2px;
}
body.pro-projects .ea-step.is-ruledout {
  opacity: 0.6;
}
body.pro-projects .ea-feedback {
  margin: 11px 0 0;
  font-size: 0.94rem;
  font-weight: 700;
  min-height: 1.2em;
}
body.pro-projects .ea-feedback.is-correct {
  color: var(--green, #16a34a);
}
body.pro-projects .ea-feedback.is-wrong {
  color: #c0392b;
}
body.pro-projects .ea-result {
  margin: 11px 0 0;
  display: grid;
  gap: 10px;
}
body.pro-projects .ea-explain {
  margin: 0;
  color: var(--navy, #10243e);
  font-size: 0.95rem;
}
body.pro-projects .ea-fix {
  padding: 11px 13px;
  border-radius: 12px;
  background: linear-gradient(120deg, rgba(22, 163, 74, 0.12), rgba(22, 163, 74, 0.04));
  border: 1px solid rgba(22, 163, 74, 0.4);
}
body.pro-projects .ea-fix-label {
  display: block;
  color: var(--green, #16a34a);
  font-size: 0.72rem;
  font-weight: 900;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 4px;
}
body.pro-projects .ea-fix-math {
  margin: 0 0 3px;
  font-family: "Courier New", ui-monospace, monospace;
  font-size: 1.02rem;
  font-weight: 700;
  color: var(--navy, #10243e);
}
body.pro-projects .ea-fix-why {
  margin: 0;
  color: var(--muted, #54677c);
  font-size: 0.9rem;
}
body.pro-projects .ea-show {
  margin-top: 12px;
}
@media (prefers-reduced-motion: reduce) {
  body.pro-projects .ea-step {
    transition: none;
  }
}
@media (max-width: 620px) {
  body.pro-projects .ea-badge {
    display: none;
  }
}

/* Practice aid only — never printed (keeps the student's report clean and
   never exposes a worked answer). */
/* ---- Teacher Signal Board (teacher-mode only) ------------------------- */
.sig-fab {
  position: fixed;
  left: 16px;
  bottom: 16px;
  z-index: 2147483000;
  font: inherit;
  font-weight: 800;
  font-size: 0.86rem;
  cursor: pointer;
  border: none;
  border-radius: 999px;
  padding: 10px 16px;
  color: #fff;
  background: linear-gradient(135deg, #0f766e, #10243e);
  box-shadow: 0 10px 26px -12px rgba(16, 36, 62, 0.8);
}
.sig-fab:hover {
  transform: translateY(-1px);
}
.sig-fab:focus-visible {
  outline: 3px solid rgba(15, 118, 110, 0.5);
  outline-offset: 2px;
}
.sig-overlay {
  position: fixed;
  inset: 0;
  z-index: 2147483001;
  display: grid;
  place-items: center;
  padding: 20px;
  background: rgba(16, 36, 62, 0.55);
}
.sig-modal {
  width: min(520px, 100%);
  max-height: 82vh;
  overflow: auto;
  background: #fff;
  color: #10243e;
  border-radius: 18px;
  padding: 20px 22px;
  box-shadow: 0 30px 70px -20px rgba(0, 0, 0, 0.6);
}
.sig-head {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 4px;
}
.sig-title {
  font-size: 1.15rem;
}
.sig-scope {
  margin-left: auto;
  font-size: 0.66rem;
  font-weight: 800;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: #0f766e;
  border: 1.5px solid currentColor;
  border-radius: 999px;
  padding: 3px 9px;
  white-space: nowrap;
}
.sig-attr {
  margin: 2px 0 12px;
  font-weight: 700;
  color: #1763c7;
}
.sig-empty {
  margin: 10px 0 16px;
  color: #54677c;
  line-height: 1.5;
}
.sig-table {
  width: 100%;
  border-collapse: collapse;
  margin: 8px 0 16px;
  font-size: 0.92rem;
}
.sig-table th,
.sig-table td {
  padding: 8px 6px;
  text-align: center;
  border-bottom: 1px solid #e3e9f0;
}
.sig-table th:first-child,
.sig-table td:first-child {
  text-align: left;
  font-weight: 700;
}
.sig-table thead th {
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: #54677c;
}
.sig-table tr.sig-hot td {
  background: rgba(192, 57, 43, 0.08);
}
.sig-table tr.sig-hot td:first-child {
  color: #c0392b;
}
.sig-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  justify-content: flex-end;
}
.sig-actions .sa-btn {
  font: inherit;
  font-weight: 800;
  cursor: pointer;
  border-radius: 10px;
  padding: 9px 15px;
  border: 1.5px solid #0f766e;
  background: #0f766e;
  color: #fff;
}
.sig-actions .sa-btn-ghost {
  background: transparent;
  color: #0f766e;
}
@media (prefers-color-scheme: dark) {
  .sig-modal {
    background: #10243e;
    color: #eaf1fb;
  }
  .sig-table th,
  .sig-table td {
    border-bottom-color: rgba(255, 255, 255, 0.12);
  }
}

@media print {
  body.pro-projects .sa-card,
  body.pro-projects .ea-card,
  .sig-fab,
  .sig-overlay {
    display: none !important;
  }
}