/* =============================================================================
 * Study Pack engine — self-contained styles.
 * All rules are scoped under .stp-root so this can drop into any host page
 * (the curriculum tool page, or Noam's Academic Help tile) without leaking.
 * Theme-aware via CSS variables with a light default and a dark override.
 * ========================================================================== */

.stp-root {
  --stp-bg: #f6f8fc;
  --stp-surface: #ffffff;
  --stp-ink: #1a2b3c;
  --stp-muted: #5a6b7c;
  --stp-line: #dde5ef;
  --stp-brand: #205fa6;
  --stp-brand-2: #2c7d6b;
  --stp-accent: #f0a500;
  --stp-good: #1f8a5b;
  --stp-good-bg: #e6f6ee;
  --stp-warn-bg: #fff4e0;
  --stp-radius: 16px;
  --stp-shadow: 0 6px 24px rgba(20, 40, 70, 0.08);
  color: var(--stp-ink);
  font-size: 1.05rem;
  line-height: 1.55;
  -webkit-text-size-adjust: 100%;
}
@media (prefers-color-scheme: dark) {
  .stp-root {
    --stp-bg: #0f1720;
    --stp-surface: #1a2530;
    --stp-ink: #eaf1f8;
    --stp-muted: #9fb2c4;
    --stp-line: #2b3a49;
    --stp-brand: #6db1ff;
    --stp-brand-2: #59d3b4;
    --stp-shadow: 0 6px 24px rgba(0, 0, 0, 0.35);
  }
}
.stp-root[data-theme="dark"] {
  --stp-bg: #0f1720;
  --stp-surface: #1a2530;
  --stp-ink: #eaf1f8;
  --stp-muted: #9fb2c4;
  --stp-line: #2b3a49;
  --stp-brand: #6db1ff;
  --stp-brand-2: #59d3b4;
}

.stp-root * {
  box-sizing: border-box;
}

/* ---- Intake (paste notes) ------------------------------------------------ */
.stp-intake {
  background: var(--stp-surface);
  border: 1px solid var(--stp-line);
  border-radius: var(--stp-radius);
  padding: clamp(16px, 3vw, 28px);
  box-shadow: var(--stp-shadow);
}
.stp-intake h2 {
  margin: 0 0 6px;
  font-size: clamp(1.3rem, 3vw, 1.7rem);
}
.stp-intake p.stp-lead {
  margin: 0 0 16px;
  color: var(--stp-muted);
}
.stp-field-label {
  display: block;
  font-weight: 700;
  margin: 12px 0 6px;
}
.stp-root textarea,
.stp-root input[type="text"] {
  width: 100%;
  font: inherit;
  color: var(--stp-ink);
  background: var(--stp-bg);
  border: 2px solid var(--stp-line);
  border-radius: 12px;
  padding: 12px 14px;
}
.stp-root textarea {
  min-height: 200px;
  resize: vertical;
}
.stp-root textarea:focus,
.stp-root input:focus {
  outline: none;
  border-color: var(--stp-brand);
}
.stp-count {
  font-size: 0.85rem;
  color: var(--stp-muted);
  text-align: right;
  margin-top: 4px;
}

/* ---- Buttons ------------------------------------------------------------- */
.stp-btn {
  font: inherit;
  font-weight: 700;
  border: 2px solid transparent;
  border-radius: 999px;
  padding: 12px 22px;
  cursor: pointer;
  min-height: 46px;
  transition:
    transform 0.08s ease,
    background 0.15s ease;
}
.stp-btn:active {
  transform: translateY(1px);
}
.stp-btn:focus-visible {
  outline: 3px solid var(--stp-brand);
  outline-offset: 2px;
}
.stp-btn.solid {
  background: var(--stp-brand);
  color: #fff;
}
.stp-btn.solid:hover {
  background: #17518f;
}
.stp-btn.ghost {
  background: transparent;
  color: var(--stp-brand);
  border-color: var(--stp-line);
}
.stp-btn.ghost:hover {
  border-color: var(--stp-brand);
}
.stp-btn[disabled] {
  opacity: 0.55;
  cursor: not-allowed;
}
.stp-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 18px;
  align-items: center;
}

/* ---- Saved packs list ---------------------------------------------------- */
.stp-saved {
  margin-top: 22px;
}
.stp-saved h3 {
  font-size: 1rem;
  margin: 0 0 8px;
  color: var(--stp-muted);
}
.stp-saved-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 8px;
}
.stp-saved-item {
  display: flex;
  align-items: center;
  gap: 10px;
  background: var(--stp-surface);
  border: 1px solid var(--stp-line);
  border-radius: 12px;
  padding: 10px 12px;
}
.stp-saved-item button.stp-open {
  flex: 1;
  text-align: left;
  background: none;
  border: none;
  color: var(--stp-ink);
  font: inherit;
  font-weight: 600;
  cursor: pointer;
}
.stp-saved-item .stp-del {
  background: none;
  border: none;
  color: var(--stp-muted);
  cursor: pointer;
  font-size: 1.1rem;
  padding: 4px 8px;
}

/* ---- Loading / error ----------------------------------------------------- */
.stp-status {
  text-align: center;
  padding: 40px 20px;
}
.stp-spinner {
  width: 42px;
  height: 42px;
  border: 4px solid var(--stp-line);
  border-top-color: var(--stp-brand);
  border-radius: 50%;
  margin: 0 auto 16px;
  animation: stp-spin 0.9s linear infinite;
}
@keyframes stp-spin {
  to {
    transform: rotate(360deg);
  }
}
@media (prefers-reduced-motion: reduce) {
  .stp-spinner {
    animation-duration: 2.2s;
  }
}
.stp-error {
  background: var(--stp-warn-bg);
  color: #7a4a00;
  border-radius: 12px;
  padding: 16px 18px;
  margin-top: 12px;
}

/* ---- Pack shell + tabs --------------------------------------------------- */
.stp-pack-head {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 16px;
  align-items: baseline;
  justify-content: space-between;
  margin-bottom: 12px;
}
.stp-pack-head h2 {
  margin: 0;
  font-size: clamp(1.4rem, 3.5vw, 2rem);
}
.stp-pack-head .stp-sub {
  color: var(--stp-muted);
  font-weight: 600;
}
.stp-tablist {
  display: flex;
  gap: 6px;
  overflow-x: auto;
  border-bottom: 2px solid var(--stp-line);
  padding-bottom: 2px;
  margin-bottom: 18px;
  scrollbar-width: thin;
}
.stp-tab {
  font: inherit;
  font-weight: 700;
  white-space: nowrap;
  background: none;
  border: none;
  border-bottom: 3px solid transparent;
  color: var(--stp-muted);
  padding: 10px 14px;
  cursor: pointer;
  min-height: 44px;
}
.stp-tab[aria-selected="true"] {
  color: var(--stp-brand);
  border-bottom-color: var(--stp-brand);
}
.stp-tab:focus-visible {
  outline: 3px solid var(--stp-brand);
  outline-offset: -3px;
  border-radius: 6px;
}
.stp-panel {
  background: var(--stp-surface);
  border: 1px solid var(--stp-line);
  border-radius: var(--stp-radius);
  padding: clamp(16px, 3vw, 26px);
  box-shadow: var(--stp-shadow);
}
.stp-panel h3 {
  margin-top: 0;
}
.stp-panel[hidden] {
  display: none;
}

/* ---- Content blocks ------------------------------------------------------ */
.stp-vocab {
  display: grid;
  gap: 12px;
}
.stp-vocab-card {
  border: 1px solid var(--stp-line);
  border-left: 5px solid var(--stp-brand-2);
  border-radius: 12px;
  padding: 12px 14px;
  background: var(--stp-bg);
}
.stp-vocab-card b {
  font-size: 1.1rem;
}
.stp-vocab-card .stp-ex {
  color: var(--stp-muted);
  font-style: italic;
  margin-top: 4px;
}
.stp-example {
  border: 1px solid var(--stp-line);
  border-radius: 12px;
  padding: 14px 16px;
  margin-bottom: 14px;
  background: var(--stp-bg);
}
.stp-example ol {
  margin: 8px 0;
  padding-left: 22px;
}
.stp-example ol li {
  margin: 4px 0;
}
.stp-example .stp-answer {
  font-weight: 700;
  color: var(--stp-good);
}
.stp-example .stp-note {
  margin-top: 8px;
  background: var(--stp-warn-bg);
  color: #7a4a00;
  border-radius: 8px;
  padding: 8px 10px;
  font-size: 0.95rem;
}

/* ---- Interactive practice / quiz ---------------------------------------- */
.stp-q {
  border: 1px solid var(--stp-line);
  border-radius: 12px;
  padding: 14px 16px;
  margin-bottom: 14px;
  background: var(--stp-bg);
}
.stp-q .stp-qtext {
  font-weight: 600;
  margin-bottom: 10px;
}
.stp-choices {
  display: grid;
  gap: 8px;
}
.stp-choice {
  text-align: left;
  font: inherit;
  background: var(--stp-surface);
  border: 2px solid var(--stp-line);
  border-radius: 10px;
  padding: 10px 14px;
  cursor: pointer;
  min-height: 44px;
}
.stp-choice:hover {
  border-color: var(--stp-brand);
}
.stp-choice.correct {
  border-color: var(--stp-good);
  background: var(--stp-good-bg);
  color: var(--stp-good);
  font-weight: 700;
}
.stp-choice.wrong {
  border-color: #c0392b;
  background: #fdecea;
  color: #a4291d;
}
.stp-choice[disabled] {
  cursor: default;
}
.stp-open-answer {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
  margin-top: 6px;
}
.stp-open-answer input {
  flex: 1;
  min-width: 180px;
}
.stp-feedback {
  margin-top: 10px;
  padding: 10px 12px;
  border-radius: 10px;
  font-weight: 600;
}
.stp-feedback.good {
  background: var(--stp-good-bg);
  color: var(--stp-good);
}
.stp-feedback.info {
  background: var(--stp-bg);
  border: 1px solid var(--stp-line);
  color: var(--stp-ink);
  font-weight: 500;
}
.stp-hint-row {
  margin-top: 8px;
}
.stp-hint {
  margin-top: 8px;
  background: var(--stp-bg);
  border-left: 4px solid var(--stp-accent);
  border-radius: 8px;
  padding: 8px 12px;
}

/* ---- Match / sort game --------------------------------------------------- */
.stp-game-instructions {
  color: var(--stp-muted);
  margin-bottom: 14px;
}
.stp-match {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 10px;
}
.stp-match-col {
  display: grid;
  gap: 8px;
  align-content: start;
}
.stp-tile {
  font: inherit;
  text-align: left;
  background: var(--stp-surface);
  border: 2px solid var(--stp-line);
  border-radius: 10px;
  padding: 10px 12px;
  cursor: pointer;
  min-height: 44px;
}
.stp-tile.selected {
  border-color: var(--stp-brand);
  box-shadow: 0 0 0 3px rgba(32, 95, 166, 0.18);
}
.stp-tile.matched {
  border-color: var(--stp-good);
  background: var(--stp-good-bg);
  color: var(--stp-good);
  cursor: default;
  opacity: 0.85;
}
.stp-tile.nudge {
  animation: stp-shake 0.3s;
}
@keyframes stp-shake {
  0%,
  100% {
    transform: translateX(0);
  }
  25% {
    transform: translateX(-5px);
  }
  75% {
    transform: translateX(5px);
  }
}
.stp-sort {
  display: grid;
  gap: 12px;
}
.stp-sort-pool {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}
.stp-buckets {
  display: grid;
  gap: 10px;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
}
.stp-bucket {
  border: 2px dashed var(--stp-line);
  border-radius: 12px;
  padding: 10px;
  min-height: 90px;
}
.stp-bucket h4 {
  margin: 0 0 8px;
  font-size: 0.95rem;
}
.stp-bucket .stp-drop {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  min-height: 40px;
}

/* ---- Listen -------------------------------------------------------------- */
.stp-listen-controls {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-items: center;
  margin-bottom: 14px;
}
.stp-listen-transcript {
  border: 1px solid var(--stp-line);
  border-radius: 12px;
  padding: 14px 16px;
  background: var(--stp-bg);
  max-height: 320px;
  overflow: auto;
}
.stp-listen-transcript p {
  margin: 0 0 10px;
}
.stp-listen-transcript p.speaking {
  background: var(--stp-warn-bg);
  border-radius: 8px;
  padding: 4px 8px;
}

/* ---- Ask ----------------------------------------------------------------- */
.stp-ask-log {
  display: grid;
  gap: 10px;
  margin-bottom: 14px;
  max-height: 340px;
  overflow: auto;
}
.stp-bubble {
  padding: 10px 14px;
  border-radius: 14px;
  max-width: 88%;
}
.stp-bubble.user {
  align-self: flex-end;
  justify-self: end;
  background: var(--stp-brand);
  color: #fff;
}
.stp-bubble.bot {
  align-self: flex-start;
  background: var(--stp-bg);
  border: 1px solid var(--stp-line);
}
.stp-ask-form {
  display: flex;
  gap: 8px;
}

.stp-progress {
  font-size: 0.9rem;
  color: var(--stp-muted);
  font-weight: 700;
}
.stp-celebrate {
  text-align: center;
  padding: 16px;
  font-weight: 700;
  color: var(--stp-good);
}
.stp-sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
}

@media (max-width: 520px) {
  .stp-match {
    grid-template-columns: 1fr;
  }
}

/* ---- Photo intake -------------------------------------------------------- */
.stp-photo-row {
  margin-top: 10px;
}
.stp-photo-chip {
  display: flex;
  align-items: center;
  gap: 10px;
  border: 1px solid var(--stp-line);
  border-radius: 12px;
  padding: 8px 10px;
  background: var(--stp-bg);
}
.stp-photo-chip img {
  width: 48px;
  height: 48px;
  object-fit: cover;
  border-radius: 8px;
  flex: none;
}
.stp-photo-chip span {
  font-weight: 700;
  flex: 1;
}