.drill-bar { position: sticky; top: 82px; z-index: 4; display: flex; align-items: center; gap: 28px; max-width: 820px; margin-bottom: 20px; padding: 16px 20px; background: #15231f; color: #fff; border-radius: 16px; box-shadow: var(--shadow); }
.drill-bar > div { display: grid; gap: 2px; }
.drill-bar .eyebrow { color: #aee5d2; }
.drill-bar strong { font-size: 1.35rem; }
.drill-bar .submit-drill { margin-left: auto; }
.drill-result { max-width: 820px; margin: 18px 0; padding: 22px; border-radius: 16px; background: var(--lime); border: 1px solid #bad66e; }
.drill-result h2, .drill-result p { margin: 0; }
.drill-result p { margin-top: 5px; font-size: 1.1rem; }
.option.selected { border-color: var(--green); background: #e9f4ef; box-shadow: 0 0 0 2px rgba(13,117,89,.13); }
.pattern-layout { display: grid; grid-template-columns: 300px 1fr; gap: 24px; align-items: start; }
.pattern-progress { display: grid; grid-template-columns: auto 1fr auto; align-items: center; gap: 22px; margin-bottom: 20px; padding: 18px 20px; background: #fff; border: 1px solid var(--line); border-radius: 16px; box-shadow: var(--shadow); }
.pattern-progress h2 { margin: 3px 0 0; font-size: 1.2rem; }
.pattern-progress dl { display: grid; grid-template-columns: repeat(5, minmax(90px, 1fr)); gap: 8px; margin: 0; }
.pattern-progress dl div { padding: 9px 11px; background: #f4f7f5; border-radius: 9px; }
.pattern-progress dt { color: var(--muted); font-size: .7rem; font-weight: 750; }
.pattern-progress dd { margin: 3px 0 0; color: var(--green-dark); font-weight: 850; }
.pattern-menu { display: grid; gap: 8px; padding: 18px; background: #fff; border: 1px solid var(--line); border-radius: 18px; }
.pattern-menu > .eyebrow { margin: 2px 5px 10px; }
.pattern-menu h3 { margin: 13px 5px 3px; color: var(--green-dark); font-size: .72rem; letter-spacing: .08em; text-transform: uppercase; }
.pattern-choice { display: grid; gap: 3px; padding: 13px; text-align: left; color: var(--ink); background: #f4f6f3; border: 1px solid transparent; border-radius: 11px; cursor: pointer; }
.pattern-choice small { color: var(--muted); }
.pattern-choice.active { background: #e8f5ef; border-color: var(--green); }
.pattern-workspace { min-height: 440px; padding: 32px; background: #fff; border: 1px solid var(--line); border-radius: 18px; box-shadow: var(--shadow); }
.pattern-workspace h2 { margin: 25px 0; font-size: 1.55rem; }
.method-prediction { margin: 0 0 24px; padding: 20px; background: #f4f7f5; border: 1px solid var(--line); border-radius: 13px; }
.method-prediction legend { padding: 0 7px; color: var(--green-dark); font-size: 1.02rem; font-weight: 850; }
.method-options { display: grid; gap: 8px; margin-bottom: 14px; }
.method-option { display: grid; grid-template-columns: auto 1fr; align-items: start; gap: 9px; padding: 10px 12px; background: #fff; border: 1px solid var(--line); border-radius: 9px; cursor: pointer; }
.method-option:has(input:checked) { border-color: var(--green); box-shadow: 0 0 0 2px rgba(13,117,89,.1); }
.method-option input { margin-top: 3px; }
.pattern-answer-area { max-width: 720px; }
.pattern-answer-area > label { display: block; margin-bottom: 7px; font-weight: 800; }
.pattern-answer-row { display: grid; grid-template-columns: minmax(150px, 1fr) auto auto; align-items: center; gap: 10px; }
.pattern-answer-row input { width: 100%; padding: 12px; font: inherit; font-size: 1.08rem; border: 1px solid var(--line); border-radius: 9px; }
.pattern-answer-row input[aria-invalid="true"] { border-color: #b34040; box-shadow: 0 0 0 2px rgba(179,64,64,.12); }
.pattern-unit { color: var(--green-dark); font-weight: 800; }
.input-help { margin: 8px 0; color: var(--muted); font-size: .88rem; }
.pattern-feedback { min-height: 1.4em; margin: 9px 0; font-weight: 700; }
.accepted-pattern-answer { color: var(--green-dark); font-weight: 800; }
.pattern-help-actions { display: flex; gap: 9px; flex-wrap: wrap; margin: 18px 0; }
.pattern-hint { margin: 9px 0; padding: 14px 16px; background: #f4f7e9; border-left: 4px solid var(--green); border-radius: 9px; }
.pattern-hint span { color: var(--green-dark); font-size: .74rem; font-weight: 850; letter-spacing: .08em; text-transform: uppercase; }
.pattern-hint p { margin: 5px 0 0; }
.worked-solution { display: grid; gap: 12px; margin-top: 20px; }
.worked-solution > div { display: grid; grid-template-columns: 110px 1fr; gap: 12px; }
.worked-solution > div:not([hidden]) { padding: 16px; background: #eef7f2; border-left: 4px solid var(--green); border-radius: 11px; }
.worked-solution .pattern-trap:not([hidden]) { background: #fff4df; border-left-color: #c47a16; }
.worked-solution span { color: var(--green-dark); font-size: .75rem; font-weight: 800; letter-spacing: .08em; text-transform: uppercase; }
.worked-solution p { margin: 0; }
.formula-table-wrap { grid-column: 1 / -1; max-width: 100%; overflow-x: auto; }
.formula-table-wrap table { width: 100%; min-width: 520px; border-collapse: collapse; }
.formula-table-wrap th, .formula-table-wrap td { padding: 9px; text-align: left; border: 1px solid var(--line); white-space: nowrap; }
.formula-table-wrap th { background: #e5f1eb; }
.pattern-recognised { margin-top: 18px; padding: 16px; background: var(--lime); border: 1px solid #bad66e; border-radius: 11px; }
.pattern-recognised p { margin: 4px 0 0; }
.new-pattern-version { margin-top: 20px; }
@media (max-width: 760px) {
  .drill-bar { top: 76px; gap: 14px; flex-wrap: wrap; }
  .drill-bar .submit-drill { margin-left: 0; }
  .pattern-layout { grid-template-columns: 1fr; }
  .pattern-menu { grid-template-columns: 1fr 1fr; }
  .pattern-menu > .eyebrow { grid-column: 1 / -1; }
  .pattern-menu h3 { grid-column: 1 / -1; }
  .pattern-workspace { padding: 22px; }
  .pattern-progress { grid-template-columns: 1fr; }
  .pattern-progress dl { grid-template-columns: 1fr 1fr; }
  .pattern-answer-row { grid-template-columns: 1fr auto; }
  .pattern-answer-row .button { grid-column: 1 / -1; }
  .worked-solution > div { grid-template-columns: 1fr; gap: 2px; }
  .pattern-help-actions .button { flex: 1 1 190px; }
}

/* Chapter Check and worksheet generator */
.check-toolbar { position: sticky; top: 82px; z-index: 5; display: flex; align-items: center; gap: 24px; margin: 0 0 18px; padding: 16px 20px; background: #15231f; color: #fff; border-radius: 16px; box-shadow: var(--shadow); }
.check-toolbar > div { display: grid; gap: 3px; }
.check-toolbar .eyebrow { color: #aee5d2; }
.check-toolbar .button:first-of-type { margin-left: auto; }
.check-warning, .worksheet-warning { margin: 16px 0; padding: 18px 20px; background: #fff4df; border: 1px solid #dfbd7c; border-radius: 14px; }
.check-warning p, .worksheet-warning p { margin: 5px 0 12px; }
.check-result { margin: 20px 0 28px; padding: 26px; background: #eef7f2; border: 1px solid #a9cfbe; border-radius: 18px; }
.check-result h2 { margin: 5px 0; }
.check-score-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 10px; margin: 20px 0; }
.check-score-grid article, .performance-grid article { padding: 14px; background: #fff; border: 1px solid var(--line); border-radius: 11px; }
.check-score-grid span { display: block; color: var(--muted); font-size: .8rem; }
.check-score-grid strong { font-size: 1.35rem; }
.performance-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(210px,1fr)); gap: 10px; }
.performance-grid h4, .performance-grid p { margin: 0 0 5px; }
.chapter-check-stack { display: grid; gap: 16px; }
.check-question { padding: 24px; background: #fff; border: 1px solid var(--line); border-radius: 16px; }
.check-question fieldset { margin: 14px 0 0; padding: 0; border: 0; }
.check-question legend { font-size: 1.08rem; font-weight: 800; }
.check-options { display: grid; gap: 9px; margin-top: 16px; }
.check-options label { cursor: pointer; }
.check-options label > span { display: grid; grid-template-columns: 28px 1fr; gap: 8px; padding: 12px; border: 1px solid var(--line); border-radius: 10px; }
.check-options input { position: absolute; opacity: 0; }
.check-options input:focus-visible + span { outline: 3px solid #7db6a5; outline-offset: 2px; }
.check-options input:checked + span { background: #e9f4ef; border-color: var(--green); }
.check-review { margin-top: 18px; padding: 17px; background: #f4f7f5; border-left: 4px solid var(--green); border-radius: 10px; }
.check-review.is-incorrect { background: #fff4df; border-left-color: #c47a16; }
.worksheet-builder { margin-bottom: 22px; padding: 24px; background: #fff; border: 1px solid var(--line); border-radius: 18px; }
.worksheet-controls { display: grid; grid-template-columns: repeat(4, minmax(150px,1fr)); gap: 14px; align-items: end; }
.worksheet-controls > label { display: grid; gap: 6px; font-weight: 750; }
.worksheet-controls select, .worksheet-controls input { width: 100%; padding: 10px; font: inherit; border: 1px solid var(--line); border-radius: 8px; }
.concept-filter { grid-column: 1 / -1; display: grid; grid-template-columns: repeat(auto-fit,minmax(230px,1fr)); gap: 8px; padding: 15px; border: 1px solid var(--line); border-radius: 11px; }
.concept-filter legend { padding: 0 6px; font-weight: 800; }
.concept-filter legend span { color: var(--muted); font-weight: 500; }
.form-help { grid-column: 1 / -1; margin: 0 0 8px; color: var(--muted); }
.mock-lesson-weights { grid-template-columns: repeat(auto-fit,minmax(280px,1fr)); background: #fbf7ea; border-color: #ead9ad; }
.mock-allocation-meter { grid-column: 1 / -1; display: grid; grid-template-columns: auto minmax(180px,1fr) auto; gap: 12px; align-items: center; padding: 12px 14px; border: 1px solid #ead9ad; border-radius: 12px; background: #fffaf0; }
.mock-allocation-meter meter { width: 100%; height: 14px; }
.mock-allocation-meter .is-over::-webkit-meter-optimum-value { background: #b34040; }
.mock-allocation-meter .is-over::-moz-meter-bar { background: #b34040; }
.mock-lesson-row { display: grid; grid-template-columns: 1fr auto; gap: 12px; align-items: center; padding: 10px 12px; background: #fff; border: 1px solid var(--line); border-radius: 12px; }
.mock-lesson-row input[type="checkbox"] { width: auto; margin-right: 8px; }
.mock-marks-control { display: inline-flex; align-items: center; gap: 6px; color: var(--muted); font-weight: 750; }
.mock-marks-control input { width: 76px; text-align: center; }
.mock-marks-control .mock-marks-slider { width: 120px; padding: 0; accent-color: var(--green); }
.worksheet-actions { display: flex; justify-content: flex-end; gap: 9px; margin-bottom: 14px; }
.worksheet-summary, .distribution-summary p { display: flex; flex-wrap: wrap; gap: 10px; }
.worksheet-summary span, .distribution-summary p span { padding: 7px 10px; background: #f1f5f2; border-radius: 8px; }
.distribution-summary { margin: 18px 0; padding: 18px; background: #eef7f2; border-radius: 12px; }
.distribution-summary h2 { margin-top: 0; }
.answer-metadata { color: var(--muted); font-size: .82rem; }
@media (max-width: 760px) {
  .check-toolbar { top: 76px; flex-wrap: wrap; gap: 12px; }
  .check-toolbar .button:first-of-type { margin-left: 0; }
  .check-score-grid { grid-template-columns: 1fr 1fr; }
  .worksheet-controls { grid-template-columns: 1fr; }
  .concept-filter { grid-column: auto; grid-template-columns: 1fr; }
  .mock-allocation-meter { grid-template-columns: 1fr; }
  .mock-lesson-row { grid-template-columns: 1fr; }
}
@media print {
  .check-toolbar, .no-print { display: none !important; }
  .worksheet { box-shadow: none; border: 0; }
  .worksheet-question { break-inside: avoid; }
}