:root{
  --su-bg:#fbfdff;
  --su-card:#ffffff;
  --su-text:#252832;
  --su-muted:#687484;
  --su-accent:#2f80ed;
  --su-accent-2:#56cfe1;
  --su-accent-soft:#eef6ff;
  --su-success:#16784b;
  --su-success-bg:#ecf8f1;
  --su-error:#a63b3b;
  --su-error-bg:#fff0f0;
  --su-border:#dbe8f5;
  --su-shadow:0 12px 34px rgba(35,78,120,.10);
  --su-radius:22px;
}
.su-exercise{max-width:760px;margin:32px auto;color:var(--su-text);font-family:Inter,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif}
.su-shell{background:var(--su-card);border:1px solid var(--su-border);border-radius:var(--su-radius);box-shadow:var(--su-shadow);overflow:hidden}
.su-header{padding:22px 24px 18px;background:linear-gradient(135deg,var(--su-accent-soft),#f8fcff);border-bottom:1px solid var(--su-border)}
.su-brandrow{display:flex;gap:10px;align-items:center;justify-content:space-between;margin-bottom:12px}
.su-brand{display:flex;align-items:center;gap:10px;font-weight:800}
.su-brandmark{width:38px;height:38px;border-radius:50%;display:inline-flex;align-items:center;justify-content:center;background:#fff;border:1px solid var(--su-border);font-size:21px}
.su-badges{display:flex;gap:8px;flex-wrap:wrap;justify-content:flex-end}
.su-badge{font-size:12px;font-weight:700;color:var(--su-muted);background:#fff;border:1px solid var(--su-border);padding:6px 9px;border-radius:999px}
.su-title{margin:0 0 6px;font-size:clamp(19px,2.25vw,25px);line-height:1.2;font-weight:850;letter-spacing:-.02em}
.su-intro{margin:0;color:var(--su-muted);line-height:1.5}
.su-progress-wrap{padding:18px 24px 0}
.su-progress-meta{display:flex;justify-content:space-between;gap:12px;font-size:13px;color:var(--su-muted);margin-bottom:8px}
.su-progress{height:9px;border-radius:999px;background:#eaf1f8;overflow:hidden}
.su-progress-bar{height:100%;width:0;background:linear-gradient(90deg,var(--su-accent),var(--su-accent-2));transition:width .25s ease}
.su-body{padding:26px 24px 28px}
.su-question{display:none}
.su-question.is-active{display:block;animation:suFade .22s ease}
@keyframes suFade{from{opacity:.35;transform:translateY(4px)}to{opacity:1;transform:none}}
.su-question-number{display:inline-block;margin-bottom:10px;font-size:12px;font-weight:750;color:#5f7892;background:#f4f8fc;border:1px solid #e0ebf5;padding:4px 8px;border-radius:999px}
.su-prompt{font-size:clamp(24px,2.8vw,27px)!important;line-height:1.4!important;font-weight:700!important;color:#253447!important;margin:6px 0 24px!important;padding:17px 20px!important;background:#f6fbff!important;border:1px solid #d8e8f7!important;border-radius:16px!important;letter-spacing:-.005em!important}
.su-options{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}
.su-option{appearance:none;border:1.5px solid var(--su-border);background:#fff;color:var(--su-text);min-height:54px;padding:12px 14px;border-radius:15px;font:inherit;font-weight:750;cursor:pointer;transition:.18s ease;box-shadow:0 1px 0 rgba(36,61,89,.02)}
.su-option:hover{border-color:#8fbff3;background:#f8fbff;transform:translateY(-2px);box-shadow:0 8px 18px rgba(47,128,237,.08)}
.su-option.is-selected{border-color:var(--su-accent);background:#eef6ff;box-shadow:0 0 0 3px rgba(47,128,237,.10), 0 8px 18px rgba(47,128,237,.08);transform:translateY(-1px)}
.su-option.is-correct-choice{border-color:#6fcf97;background:#eefaf3;box-shadow:0 8px 18px rgba(22,120,75,.08)}
.su-option.is-wrong-choice{border-color:#f2a3a3;background:#fff4f4;box-shadow:0 8px 18px rgba(166,59,59,.06)}
.su-option:disabled{cursor:default;transform:none}
.su-actions{display:flex;gap:10px;flex-wrap:wrap;align-items:center;margin-top:18px}
.su-btn{appearance:none;border:0;border-radius:14px;padding:12px 16px;font:inherit;font-weight:800;cursor:pointer;transition:.16s ease}
.su-btn-primary{background:var(--su-accent);color:#fff}
.su-btn-secondary{background:#f3f8fd;color:var(--su-text);border:1px solid var(--su-border)}
.su-feedback{display:none;margin-top:18px;border-radius:16px;padding:14px 16px;line-height:1.5;font-weight:650}
.su-feedback.is-correct{display:block;background:var(--su-success-bg);color:var(--su-success);border:1px solid #cfe9db}
.su-feedback.is-wrong{display:block;background:var(--su-error-bg);color:var(--su-error);border:1px solid #f0cece}
.su-explanation{display:none;margin-top:12px;padding:14px 16px;background:#f7fbff;border:1px dashed #bdd7ee;border-radius:14px;color:#4c5968;line-height:1.6}
.su-explanation.is-visible{display:block}
.su-result{display:none;text-align:center;padding:8px 0 2px}
.su-result.is-visible{display:block}
.su-score{font-size:clamp(38px,8vw,64px);line-height:1;font-weight:900;color:var(--su-accent);margin:8px 0 4px}
.su-percent{color:var(--su-muted);font-weight:800}
.su-motivation{margin:18px auto 20px;max-width:560px;padding:15px 18px;background:linear-gradient(135deg,#f7fbff,var(--su-accent-soft));border:1px solid var(--su-border);border-radius:16px;font-weight:750;line-height:1.55}
.su-next{margin-top:22px;padding:18px;text-align:left;border:1px solid var(--su-border);border-radius:18px;background:var(--su-bg)}
.su-next-title{margin:0 0 6px;font-size:17px}.su-next p{margin:0 0 12px;color:var(--su-muted)}.su-next a{display:inline-flex;text-decoration:none}
@media (max-width:620px){.su-header,.su-body{padding-left:18px;padding-right:18px}.su-progress-wrap{padding-left:18px;padding-right:18px}.su-brandrow{align-items:flex-start}.su-options{grid-template-columns:1fr}.su-btn{width:100%}}

.su-prompt .su-blank{display:inline!important;min-width:0!important;padding:0!important;margin:0 2px!important;color:inherit!important;border:0!important;font-weight:700!important;text-align:inherit!important;line-height:inherit!important}


/* === Fill blank / respuesta escrita === */

.su-fill-prompt{
  font-size:clamp(24px,2.8vw,27px)!important;
  line-height:1.5!important;
  font-weight:700!important;
  color:#253447!important;
  margin:6px 0 20px!important;
  padding:17px 20px!important;
  background:#f6fbff!important;
  border:1px solid #d8e8f7!important;
  border-radius:16px!important;
}

.su-fill-help{
  margin:-8px 0 18px;
  color:var(--su-muted);
  font-size:14px;
  line-height:1.5;
}

.su-fill-input{
  display:inline-block;
  width:min(170px, 42vw);
  min-width:110px;
  padding:7px 10px 6px;
  margin:0 5px;
  border:0;
  border-bottom:2px solid #8eb9e8;
  border-radius:8px 8px 4px 4px;
  background:#ffffff;
  color:#1f2a37;
  font:inherit;
  font-weight:800;
  text-align:center;
  outline:none;
  transition:.16s ease;
  box-shadow:0 1px 0 rgba(36,61,89,.03);
}

.su-fill-input:focus{
  border-bottom-color:var(--su-accent);
  background:#fafdff;
  box-shadow:0 0 0 3px rgba(47,128,237,.08);
}

.su-fill-input.is-correct{
  border-bottom-color:#53b983;
  background:#eefaf3;
  color:#12633f;
}

.su-fill-input.is-wrong{
  border-bottom-color:#e28d8d;
  background:#fff4f4;
  color:#8f2f2f;
}

.su-fill-input[disabled]{
  opacity:1;
  cursor:default;
}

.su-fill-correct-answer{
  display:none;
  margin-top:10px;
  color:#4f5d6c;
  font-size:14px;
  line-height:1.5;
}

.su-fill-correct-answer.is-visible{
  display:block;
}

@media (max-width:620px){
  .su-fill-input{
    width:130px;
    min-width:100px;
    margin:5px 3px;
  }
}


/* === 1.8: infinitive cue inside fill_blank sentences === */
.su-fill-prompt .su-fill-help{
  display:inline-block;
  margin:0 0 0 7px;
  color:#526b84;
  font-size:17px;
  line-height:1.2;
  font-weight:750;
  vertical-align:baseline;
}

@media (max-width:620px){
  .su-fill-prompt .su-fill-help{
    font-size:16px;
    margin-left:5px;
  }
}


/* === 1.9: tile_select / sentence match === */
.su-tile-sentence{
  font-size:clamp(24px,2.8vw,27px)!important;
  line-height:1.5!important;
  font-weight:700!important;
  color:#253447!important;
  margin:6px 0 18px!important;
  padding:17px 20px!important;
  background:#f6fbff!important;
  border:1px solid #d8e8f7!important;
  border-radius:16px!important;
}

.su-tile-target{
  display:inline-flex;
  align-items:center;
  min-width:190px;
  min-height:42px;
  padding:7px 12px;
  margin:0 4px;
  border:1.5px dashed #9fc4e8;
  border-radius:12px;
  background:#ffffff;
  color:#49647f;
  font-weight:800;
  vertical-align:middle;
  transition:.16s ease;
}

.su-tile-target.has-value{
  border-style:solid;
  border-color:#7fb5e8;
  background:#eef6ff;
  color:#1f4f7c;
}

.su-tile-target.is-correct{
  border-color:#6fcf97;
  background:#eefaf3;
  color:#12633f;
}

.su-tile-target.is-wrong{
  border-color:#f2a3a3;
  background:#fff4f4;
  color:#8f2f2f;
}

.su-tile-bank{
  display:flex;
  flex-wrap:wrap;
  gap:10px;
  margin:18px 0 4px;
}

.su-tile{
  appearance:none;
  border:1.5px solid var(--su-border);
  background:#fff;
  color:var(--su-text);
  padding:10px 13px;
  border-radius:14px;
  font:inherit;
  font-weight:750;
  cursor:pointer;
  transition:.18s ease;
  box-shadow:0 1px 0 rgba(36,61,89,.02);
}

.su-tile:hover{
  border-color:#8fbff3;
  background:#f8fbff;
  transform:translateY(-2px);
  box-shadow:0 8px 18px rgba(47,128,237,.08);
}

.su-tile.is-selected{
  border-color:var(--su-accent);
  background:#eef6ff;
  box-shadow:0 0 0 3px rgba(47,128,237,.10);
}

.su-tile[disabled]{
  cursor:default;
  opacity:.72;
  transform:none;
}

@media (max-width:620px){
  .su-tile-target{
    min-width:150px;
    max-width:100%;
  }
  .su-tile{
    width:100%;
    text-align:left;
  }
}