/* =============================================================================
   IAM English Engine — Global Styles v2.0
   Mobile-first · No framework · CSS custom properties for theming
   ============================================================================= */

/* ── Design Tokens ─────────────────────────────────────────────────────────── */
:root {
  --iam-primary:        #4F46E5;
  --iam-primary-dark:   #3730A3;
  --iam-primary-light:  #EEF2FF;
  --iam-success:        #16A34A;
  --iam-success-light:  #DCFCE7;
  --iam-error:          #DC2626;
  --iam-error-light:    #FEF2F2;
  --iam-warning:        #D97706;
  --iam-surface:        #F8FAFC;
  --iam-border:         #E2E8F0;
  --iam-text:           #1E293B;
  --iam-muted:          #64748B;
  --iam-white:          #FFFFFF;
  --iam-radius:         12px;
  --iam-radius-sm:      8px;
  --iam-shadow:         0 4px 6px -1px rgb(0 0 0 / .08), 0 2px 4px -2px rgb(0 0 0 / .05);
  --iam-shadow-lg:      0 10px 15px -3px rgb(0 0 0 / .1), 0 4px 6px -4px rgb(0 0 0 / .05);
  --iam-transition:     200ms cubic-bezier(.4, 0, .2, 1);
  --iam-font:           'Nunito', 'Segoe UI', system-ui, sans-serif;
}

/* ── Base Reset ────────────────────────────────────────────────────────────── */
.iam-engine *,
.iam-engine *::before,
.iam-engine *::after { box-sizing: border-box; margin: 0; padding: 0; }

.iam-engine {
  font-family: var(--iam-font);
  color: var(--iam-text);
  max-width: 860px;
  margin: 0 auto;
  padding: 1.25rem;
}

/* ── Utility ───────────────────────────────────────────────────────────────── */
.iam-error {
  background: var(--iam-error-light);
  border: 1px solid #FECACA;
  border-left: 4px solid var(--iam-error);
  color: var(--iam-error);
  border-radius: var(--iam-radius-sm);
  padding: .75rem 1rem;
  font-size: .875rem;
  margin: 1rem 0;
}

.iam-placeholder {
  background: #FFFBEB;
  border: 2px dashed var(--iam-warning);
  border-radius: var(--iam-radius);
  padding: 2rem;
  text-align: center;
  color: var(--iam-warning);
  font-size: .95rem;
}

/* ── Shared Buttons ────────────────────────────────────────────────────────── */
.iam-btn {
  display: inline-flex;
  align-items: center;
  gap: .4rem;
  padding: .65rem 1.4rem;
  border: none;
  border-radius: var(--iam-radius-sm);
  font-family: var(--iam-font);
  font-size: .95rem;
  font-weight: 700;
  cursor: pointer;
  transition: transform var(--iam-transition), box-shadow var(--iam-transition), opacity var(--iam-transition);
}
.iam-btn:hover:not(:disabled) { transform: translateY(-1px); box-shadow: var(--iam-shadow); }
.iam-btn:active:not(:disabled) { transform: translateY(0); }
.iam-btn:disabled { opacity: .45; cursor: not-allowed; }

.iam-btn--check {
  background: var(--iam-primary);
  color: var(--iam-white);
}
.iam-btn--check:hover:not(:disabled) { background: var(--iam-primary-dark); }

.iam-btn--reset {
  background: var(--iam-surface);
  color: var(--iam-muted);
  border: 1px solid var(--iam-border);
}
.iam-btn--reset:hover { background: var(--iam-border); color: var(--iam-text); }

/* ─────────────────────────────────────────────────────────────────────────────
   ENGINE 06 — WORD BANK (Sentence Fill-In)
   ───────────────────────────────────────────────────────────────────────────── */

.iam-wordbank .iam-wb__header {
  text-align: center;
  margin-bottom: 1.5rem;
}

.iam-wb__badge {
  display: inline-block;
  background: var(--iam-primary-light);
  color: var(--iam-primary);
  font-size: .8rem;
  font-weight: 700;
  letter-spacing: .05em;
  text-transform: uppercase;
  padding: .25rem .75rem;
  border-radius: 999px;
  margin-bottom: .5rem;
}

.iam-wb__title {
  font-size: 1.4rem;
  font-weight: 800;
  color: var(--iam-text);
  margin-bottom: .25rem;
}

.iam-wb__instruction {
  color: var(--iam-muted);
  font-size: .95rem;
}

/* Sentences */
.iam-wb__sentences {
  display: flex;
  flex-direction: column;
  gap: .75rem;
  margin-bottom: 1.5rem;
}

.iam-wb__sentence {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: .4rem;
  background: var(--iam-white);
  border: 1.5px solid var(--iam-border);
  border-radius: var(--iam-radius);
  padding: .75rem 1rem;
  transition: border-color var(--iam-transition);
}

.iam-wb__sentence.is-correct  { border-color: var(--iam-success); background: var(--iam-success-light); }
.iam-wb__sentence.is-wrong    { border-color: var(--iam-error);   background: var(--iam-error-light); animation: iam-shake .35s ease; }
.iam-wb__sentence.is-filled   { border-color: var(--iam-primary); }

.iam-wb__num {
  width: 1.5rem;
  height: 1.5rem;
  border-radius: 50%;
  background: var(--iam-primary-light);
  color: var(--iam-primary);
  font-size: .75rem;
  font-weight: 800;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.iam-wb__text { font-size: 1rem; line-height: 1.6; }

.iam-wb__drop-zone {
  min-width: 80px;
  height: 2.2rem;
  border: 2px dashed var(--iam-border);
  border-radius: var(--iam-radius-sm);
  background: var(--iam-surface);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0 .5rem;
  font-weight: 700;
  color: var(--iam-primary);
  font-size: .95rem;
  transition: border-color var(--iam-transition), background var(--iam-transition);
  cursor: pointer;
}
.iam-wb__drop-zone.drag-over {
  border-color: var(--iam-primary);
  background: var(--iam-primary-light);
}
.iam-wb__drop-zone.is-filled {
  border-style: solid;
  border-color: var(--iam-primary);
  background: var(--iam-primary-light);
}

.iam-wb__audio-btn {
  background: none;
  border: none;
  cursor: pointer;
  font-size: 1.1rem;
  padding: .25rem;
  border-radius: var(--iam-radius-sm);
  transition: transform var(--iam-transition);
  line-height: 1;
}
.iam-wb__audio-btn:hover { transform: scale(1.2); }
.iam-wb__audio-btn.is-playing { animation: iam-pulse 1s ease infinite; }

.iam-wb__feedback { font-size: 1rem; min-width: 1.2rem; }

/* Word bank tokens */
.iam-wb__bank {
  display: flex;
  flex-wrap: wrap;
  gap: .5rem;
  background: var(--iam-surface);
  border: 1.5px solid var(--iam-border);
  border-radius: var(--iam-radius);
  padding: 1rem;
  margin-bottom: 1.25rem;
  min-height: 3.5rem;
}

.iam-wb__token {
  padding: .45rem .9rem;
  background: var(--iam-white);
  border: 1.5px solid var(--iam-primary);
  border-radius: var(--iam-radius-sm);
  color: var(--iam-primary);
  font-family: var(--iam-font);
  font-size: .95rem;
  font-weight: 700;
  cursor: grab;
  user-select: none;
  transition: transform var(--iam-transition), box-shadow var(--iam-transition), opacity var(--iam-transition);
  touch-action: none;
}
.iam-wb__token:hover  { transform: translateY(-2px); box-shadow: var(--iam-shadow); }
.iam-wb__token.is-dragging { opacity: .4; cursor: grabbing; }
.iam-wb__token.is-used { display: none; }

/* Controls + completion */
.iam-wb__controls {
  display: flex;
  gap: .75rem;
  flex-wrap: wrap;
  margin-bottom: 1rem;
}

.iam-wb__complete {
  background: var(--iam-success-light);
  border: 1.5px solid var(--iam-success);
  border-radius: var(--iam-radius);
  padding: 1rem 1.5rem;
  text-align: center;
  color: var(--iam-success);
  font-size: 1.05rem;
}

/* ─────────────────────────────────────────────────────────────────────────────
   ENGINE 01 — IMAGE MATCHING (Drag & Drop)
   ───────────────────────────────────────────────────────────────────────────── */

.iam-dragdrop .iam-dd__header {
  text-align: center;
  margin-bottom: 1.25rem;
}

.iam-dd__badge {
  display: inline-block;
  background: #FFF7ED;
  color: #C2410C;
  font-size: .8rem;
  font-weight: 700;
  letter-spacing: .05em;
  text-transform: uppercase;
  padding: .25rem .75rem;
  border-radius: 999px;
  margin-bottom: .5rem;
}

.iam-dd__title {
  font-size: 1.4rem;
  font-weight: 800;
  margin-bottom: .25rem;
}

.iam-dd__instruction {
  color: var(--iam-muted);
  font-size: .95rem;
}

/* Word bank */
.iam-dd__bank {
  display: flex;
  flex-wrap: wrap;
  gap: .5rem;
  background: var(--iam-surface);
  border: 1.5px solid var(--iam-border);
  border-radius: var(--iam-radius);
  padding: 1rem;
  margin-bottom: 1.5rem;
  min-height: 3.5rem;
}

.iam-dd__token {
  padding: .45rem .9rem;
  background: var(--iam-white);
  border: 1.5px solid #C2410C;
  border-radius: var(--iam-radius-sm);
  color: #C2410C;
  font-family: var(--iam-font);
  font-size: .95rem;
  font-weight: 700;
  cursor: grab;
  user-select: none;
  transition: transform var(--iam-transition), box-shadow var(--iam-transition), opacity var(--iam-transition);
  touch-action: none;
}
.iam-dd__token:hover    { transform: translateY(-2px); box-shadow: var(--iam-shadow); }
.iam-dd__token.is-dragging { opacity: .4; cursor: grabbing; }
.iam-dd__token.is-used  { display: none; }

/* Image card grid */
.iam-dd__grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.iam-dd__card {
  background: var(--iam-white);
  border: 1.5px solid var(--iam-border);
  border-radius: var(--iam-radius);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  align-items: center;
  transition: border-color var(--iam-transition);
  box-shadow: var(--iam-shadow);
}
.iam-dd__card.is-correct { border-color: var(--iam-success); }
.iam-dd__card.is-wrong   { border-color: var(--iam-error); animation: iam-shake .35s ease; }

.iam-dd__image {
  width: 100%;
  aspect-ratio: 1;
  object-fit: cover;
  display: block;
}

.iam-dd__audio-btn {
  background: none;
  border: none;
  cursor: pointer;
  font-size: 1rem;
  padding: .3rem;
  transition: transform var(--iam-transition);
  line-height: 1;
}
.iam-dd__audio-btn:hover { transform: scale(1.2); }
.iam-dd__audio-btn.is-playing { animation: iam-pulse 1s ease infinite; }

.iam-dd__drop-zone {
  width: 100%;
  min-height: 2.4rem;
  border-top: 1.5px dashed var(--iam-border);
  background: var(--iam-surface);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: .9rem;
  font-weight: 700;
  color: var(--iam-muted);
  transition: background var(--iam-transition), border-color var(--iam-transition);
  cursor: pointer;
  padding: .35rem .5rem;
  text-align: center;
}
.iam-dd__drop-zone.drag-over {
  background: #FFF7ED;
  border-color: #C2410C;
  color: #C2410C;
}
.iam-dd__drop-zone.is-filled {
  background: #FFF7ED;
  border-color: #C2410C;
  color: #C2410C;
  border-style: solid;
}

.iam-dd__feedback { font-size: 1rem; padding: .2rem 0; }

/* Controls + completion */
.iam-dd__controls {
  display: flex;
  gap: .75rem;
  flex-wrap: wrap;
  margin-bottom: 1rem;
}

.iam-dd__complete {
  background: var(--iam-success-light);
  border: 1.5px solid var(--iam-success);
  border-radius: var(--iam-radius);
  padding: 1rem 1.5rem;
  text-align: center;
  color: var(--iam-success);
  font-size: 1.05rem;
}

/* ── Ghost (drag clone that follows cursor) ────────────────────────────────── */
.iam-drag-ghost {
  position: fixed;
  pointer-events: none;
  z-index: 9999;
  opacity: .85;
  transform: scale(1.08) rotate(2deg);
  transition: none;
  box-shadow: var(--iam-shadow-lg);
}

/* ── Shared Animations ─────────────────────────────────────────────────────── */
@keyframes iam-shake {
  0%,100% { transform: translateX(0); }
  20%      { transform: translateX(-6px); }
  40%      { transform: translateX(6px); }
  60%      { transform: translateX(-4px); }
  80%      { transform: translateX(4px); }
}

@keyframes iam-pulse {
  0%,100% { transform: scale(1); }
  50%     { transform: scale(1.15); }
}

/* ── Responsive ────────────────────────────────────────────────────────────── */
@media (max-width: 480px) {
  .iam-wb__sentence { padding: .6rem .75rem; }
  .iam-dd__grid     { grid-template-columns: repeat(2, 1fr); }
  .iam-btn          { font-size: .875rem; padding: .55rem 1rem; }
}

/* ============================================================
   APPEND THIS TO THE BOTTOM OF:
   wp-content/plugins/iam-english-engine/assets/css/iam-engine.css
   ============================================================ */

/* --- Shared --- */
.iam-exercise-title { font-size: 1.2rem; font-weight: 700; margin-bottom: .5rem; }
.iam-instruction    { font-size: .95rem; color: #555; margin-bottom: 1rem; }
.iam-feedback-success { color: #1b6b3a; font-weight: 600; }
.iam-feedback-error   { color: #922b21; font-weight: 600; }
.iam-feedback-warn    { color: #7a5c00; font-weight: 600; }

.iam-btn {
    display: inline-block;
    margin-top: 1rem;
    padding: .6rem 1.4rem;
    background: #4f86c6;
    color: #fff;
    border: none;
    border-radius: 6px;
    font-size: .95rem;
    font-weight: 600;
    cursor: pointer;
    transition: background .15s, opacity .15s;
}
.iam-btn:hover:not(:disabled) { background: #3a6fad; }
.iam-btn:disabled { opacity: .5; cursor: default; }

.iam-audio-btn {
    background: none;
    border: none;
    cursor: pointer;
    font-size: 1.1rem;
    padding: .2rem .4rem;
    border-radius: 4px;
    transition: background .15s;
}
.iam-audio-btn:hover { background: #eef4fd; }

/* ============================================================
   SORT
   ============================================================ */
.iam-sort-wrapper  { margin: 1.5rem 0; }

.iam-sort-bank {
    display: flex;
    flex-wrap: wrap;
    gap: .5rem;
    padding: .75rem;
    background: #f5f7fa;
    border: 2px dashed #cdd3da;
    border-radius: 10px;
    min-height: 56px;
    margin-bottom: 1rem;
}

.iam-sort-item {
    display: inline-flex;
    align-items: center;
    gap: .35rem;
    padding: .4rem .8rem;
    background: #fff;
    border: 2px solid #cdd3da;
    border-radius: 999px;
    font-size: .9rem;
    font-weight: 500;
    cursor: grab;
    user-select: none;
    touch-action: none;
    transition: border-color .15s, box-shadow .15s;
}
.iam-sort-item:hover       { border-color: #4f86c6; box-shadow: 0 2px 8px rgba(0,0,0,.1); }
.iam-sort-item img         { width: 32px; height: 32px; object-fit: cover; border-radius: 4px; }
.iam-sort-item.iam-correct  { border-color: #2e9e55; background: #edfbf2; color: #1b6b3a; cursor: default; }
.iam-sort-item.iam-incorrect{ border-color: #d94f3d; background: #fdecea; color: #922b21; cursor: default; }
.iam-sort-item.iam-locked   { cursor: default; pointer-events: none; }

.iam-sort-categories { display: flex; gap: 1rem; flex-wrap: wrap; }
.iam-sort-category   { flex: 1; min-width: 140px; }

.iam-sort-category-label {
    text-align: center;
    font-weight: 700;
    padding: .4rem .6rem;
    background: var(--cat-color, #4f86c6);
    color: #fff;
    border-radius: 6px 6px 0 0;
}

.iam-sort-drop-zone {
    min-height: 80px;
    padding: .6rem;
    border: 2px dashed var(--cat-color, #4f86c6);
    border-top: none;
    border-radius: 0 0 6px 6px;
    display: flex;
    flex-wrap: wrap;
    gap: .4rem;
    align-content: flex-start;
    transition: background .15s;
}
.iam-sort-drop-zone.iam-over { background: rgba(79,134,198,.1); }
.iam-sort-feedback { margin: .75rem 0 .25rem; min-height: 1.4em; font-size: .9rem; }

/* ============================================================
   MATCH
   ============================================================ */
.iam-match-wrapper  { margin: 1.5rem 0; }

.iam-match-columns  { display: flex; gap: 1.5rem; }
.iam-match-col      { flex: 1; display: flex; flex-direction: column; gap: .5rem; }

.iam-match-card {
    padding: .55rem .9rem;
    background: #fff;
    border: 2px solid #cdd3da;
    border-radius: 8px;
    font-size: .9rem;
    font-weight: 500;
    cursor: pointer;
    user-select: none;
    display: flex;
    align-items: center;
    gap: .4rem;
    transition: border-color .15s, box-shadow .15s, background .15s;
}
.iam-match-card:hover:not(.iam-locked) { border-color: #4f86c6; box-shadow: 0 2px 8px rgba(0,0,0,.1); }
.iam-match-card img       { width: 44px; height: 44px; object-fit: cover; border-radius: 4px; flex-shrink: 0; }
.iam-match-card.iam-selected  { border-color: #4f86c6; background: #eef4fd; box-shadow: 0 0 0 3px rgba(79,134,198,.2); }
.iam-match-card.iam-paired    { border-color: var(--pair-color,#4f86c6); background: color-mix(in srgb,var(--pair-color,#4f86c6) 10%,white); }
.iam-match-card.iam-correct   { border-color: #2e9e55 !important; background: #edfbf2 !important; color: #1b6b3a; cursor: default; }
.iam-match-card.iam-incorrect { border-color: #d94f3d !important; background: #fdecea !important; color: #922b21; }
.iam-match-card.iam-locked    { cursor: default; pointer-events: none; }
.iam-match-feedback { margin: .75rem 0 .25rem; min-height: 1.4em; font-size: .9rem; }

/* ============================================================
   BUILDER
   ============================================================ */
.iam-builder-wrapper  { margin: 1.5rem 0; }

.iam-builder-sentence {
    background: #f5f7fa;
    border: 1px solid #e2e6ea;
    border-radius: 10px;
    padding: .75rem 1rem;
    margin-bottom: 1rem;
    display: flex;
    flex-direction: column;
    gap: .5rem;
}

.iam-builder-number {
    font-size: .8rem;
    font-weight: 700;
    color: #4f86c6;
    text-transform: uppercase;
    letter-spacing: .05em;
}

.iam-builder-zone {
    display: flex;
    flex-wrap: wrap;
    gap: .4rem;
    min-height: 44px;
    padding: .4rem .6rem;
    background: #fff;
    border: 2px dashed #4f86c6;
    border-radius: 6px;
}

.iam-builder-bank {
    display: flex;
    flex-wrap: wrap;
    gap: .4rem;
    padding: .4rem 0;
}

.iam-builder-tile {
    padding: .35rem .75rem;
    background: #fff;
    border: 2px solid #cdd3da;
    border-radius: 6px;
    font-size: .9rem;
    font-weight: 500;
    cursor: pointer;
    transition: border-color .15s, background .15s, transform .1s;
}
.iam-builder-tile:hover:not(.iam-locked) { border-color: #4f86c6; background: #eef4fd; transform: translateY(-1px); }
.iam-builder-tile.iam-correct   { border-color: #2e9e55; background: #edfbf2; color: #1b6b3a; cursor: default; }
.iam-builder-tile.iam-incorrect { border-color: #d94f3d; background: #fdecea; color: #922b21; }
.iam-builder-tile.iam-locked    { cursor: default; pointer-events: none; }
.iam-builder-feedback { font-size: .85rem; min-height: 1.2em; }

/* ============================================================
   RESPONSIVE
   ============================================================ */
@media ( max-width: 600px ) {
    .iam-sort-categories { flex-direction: column; }
    .iam-match-columns   { flex-direction: column; gap: .75rem; }
}