: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}.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}.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}.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)}.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}.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}.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}.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}.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}.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}.iam-dd__grid{display:grid;grid-template-columns:repeat(auto-fit,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}.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}.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)}@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)}}.iam-engine{max-width:860px;margin-left:auto;margin-right:auto}.iam-dd__bank,.iam-dd__grid{justify-content:center}.iam-dd__token{padding:.5rem 1rem;line-height:1.3}.iam-dd__bank{justify-content:center}.iam-dd__grid{justify-content:center;max-width:860px;margin:0 auto 1.5rem}.iam-dd__controls{justify-content:center;margin-top:1.5rem}.iam-dd__card{margin-bottom:.25rem}:root{--iam-warning-light:#FFFBEB}.iam-btn--show{background:var(--iam-warning-light);color:var(--iam-warning);border:1.5px solid var(--iam-warning)}.iam-btn--show:hover:not(:disabled){background:var(--iam-warning);color:var(--iam-white)}.iam-show-answer-badge{display:inline-flex;align-items:center;gap:.25rem;background:var(--iam-warning-light);color:var(--iam-warning);border:1.5px dashed var(--iam-warning);border-radius:var(--iam-radius-sm);padding:.2rem .6rem;font-size:.82rem;font-weight:700;margin:.25rem .25rem 0 0;white-space:nowrap}.is-answer-revealed{outline:2px dashed var(--iam-warning)!important;outline-offset:2px;background:var(--iam-warning-light)!important}.iam-revealed .iam-btn--show{opacity:.55}.iam-hotspot-pin .iam-show-answer-badge,.iam-dialogue-line .iam-show-answer-badge{position:static;margin-left:.5rem}