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.lesson-grid[data-astro-cid-2u2tmaaq]{gap:var(--space-3);margin:var(--space-4) 0 var(--space-4);grid-template-columns:1fr;padding:0;list-style:none;display:grid}.lesson-grid__item[data-astro-cid-2u2tmaaq]{min-width:0;display:flex}.lesson-card[data-astro-cid-2u2tmaaq]{background:var(--surface-raised);border:1px solid var(--divider-quiet);border-radius:var(--radius-card);min-width:0;transition:border-color var(--motion-fast) ease;flex:1;display:flex}.lesson-card[data-astro-cid-2u2tmaaq]:focus-within,.lesson-card[data-astro-cid-2u2tmaaq]:hover{border-color:var(--link)}.lesson-card__link[data-astro-cid-2u2tmaaq]{align-items:start;gap:var(--space-2);min-width:0;min-height:var(--control-height);padding:var(--space-3);border-radius:inherit;color:var(--text-primary);overflow-wrap:anywhere;transition:background-color var(--motion-fast) ease;flex:1;grid-template-columns:auto minmax(0,1fr);text-decoration:none;display:grid}.lesson-card__link[data-astro-cid-2u2tmaaq]:is(:hover,:focus-visible){background:var(--surface-subtle)}.lesson-card__link[data-astro-cid-2u2tmaaq]:is(:hover,:focus-visible) .lesson-card__title[data-astro-cid-2u2tmaaq]{color:var(--link);text-underline-offset:.2em;text-decoration:underline}.lesson-card__link[data-astro-cid-2u2tmaaq]:focus-visible{outline:var(--focus-ring-width) solid var(--focus-ring-color);outline-offset:var(--focus-ring-offset)}.lesson-card__link[data-astro-cid-2u2tmaaq] .lesson-card__icon{color:var(--link);margin-top:var(--space-0)}.lesson-card__copy[data-astro-cid-2u2tmaaq]{min-width:0}.lesson-card__title[data-astro-cid-2u2tmaaq]{font-family:var(--font-heading);letter-spacing:-.01em;font-weight:700;line-height:1.25;font-size:var(--type-control);margin:0}.lesson-card__desc[data-astro-cid-2u2tmaaq]{margin:var(--space-0) 0 0;color:var(--text-secondary);font:var(--type-meta)/var(--leading-ui) var(--font-ui)}.lesson-card__meta[data-astro-cid-2u2tmaaq]{align-items:center;gap:var(--space-2);min-width:0;font:650 var(--type-caption)/var(--leading-ui) var(--font-ui);flex-wrap:wrap;grid-column:2;display:flex}.lesson-card__badge[data-astro-cid-2u2tmaaq]{padding:var(--space-0) var(--space-1);border-radius:var(--radius-pill);background:var(--surface-subtle);color:var(--text-secondary)}.lesson-card__action[data-astro-cid-2u2tmaaq]{align-items:center;gap:var(--space-1);color:var(--link);margin-inline-start:auto;display:inline-flex}.lesson-card__action[data-astro-cid-2u2tmaaq] svg{transition:transform var(--motion-fast) ease;flex:none}.lesson-card__link[data-astro-cid-2u2tmaaq]:is(:hover,:focus-visible) .lesson-card__arrow{transform:translate(2px)}@media (width>=40rem){.lesson-card__link[data-astro-cid-2u2tmaaq]{grid-template-columns:auto minmax(0,1fr) minmax(0,10rem);align-items:center}.lesson-card__copy[data-astro-cid-2u2tmaaq]{max-width:36rem}.lesson-card__meta[data-astro-cid-2u2tmaaq]{text-align:right;grid-column:auto;justify-content:flex-end}}@media (prefers-reduced-motion:reduce){.lesson-card[data-astro-cid-2u2tmaaq],.lesson-card__link[data-astro-cid-2u2tmaaq],.lesson-card__action[data-astro-cid-2u2tmaaq] svg{transition:none}.lesson-card__link[data-astro-cid-2u2tmaaq]:is(:hover,:focus-visible) .lesson-card__arrow{transform:none}}
.radial-area-element[data-astro-cid-v7rznohs]{max-width:var(--width-illustration-hero);margin-inline:auto}
.mode-walls[data-astro-cid-4weaqbkt] path{fill:none;stroke:var(--ink-900);stroke-width:3px}.mode-springs[data-astro-cid-4weaqbkt] path{fill:none;stroke:var(--ink-700);stroke-width:3px}.mode-masses[data-astro-cid-4weaqbkt] rect{fill:var(--paper-200);stroke:var(--ink-900);stroke-width:2px}.mode-arrows[data-astro-cid-4weaqbkt] line{stroke:var(--success-700);stroke-width:4px}.mode-arrowhead[data-astro-cid-4weaqbkt]{fill:var(--success-700)}
.numbered-learning-item[data-astro-cid-u7sqbtor]{margin-block:var(--space-4);border-block-start:1px solid var(--divider-quiet);padding-block-start:var(--space-3)}.numbered-learning-item[data-astro-cid-u7sqbtor]:first-child{border-block-start:0;margin-block-start:0;padding-block-start:0}.numbered-learning-item__heading[data-astro-cid-u7sqbtor]{align-items:baseline;gap:var(--space-0) var(--space-2);margin:0 0 var(--space-2);scroll-margin-top:var(--space-8);color:var(--text-primary);font-family:var(--font-heading);font-size:var(--type-subsection);letter-spacing:-.008em;text-wrap:balance;flex-wrap:wrap;font-weight:650;display:flex}.numbered-learning-item__label[data-astro-cid-u7sqbtor]{align-items:center;gap:var(--space-1);color:var(--accent-700);font:650 var(--type-control)/var(--leading-ui) var(--font-ui);display:inline-flex}.numbered-learning-item__label[data-astro-cid-u7sqbtor] svg{flex:none}.numbered-learning-item--mind-stretcher[data-astro-cid-u7sqbtor] .numbered-learning-item__label[data-astro-cid-u7sqbtor]{color:var(--warning-700)}.numbered-learning-item--practical-task[data-astro-cid-u7sqbtor] .numbered-learning-item__label[data-astro-cid-u7sqbtor]{color:var(--info-700)}.numbered-learning-item--exam-question[data-astro-cid-u7sqbtor] .numbered-learning-item__label[data-astro-cid-u7sqbtor]{color:var(--text-secondary)}.numbered-learning-item--titled[data-astro-cid-u7sqbtor] .numbered-learning-item__title[data-astro-cid-u7sqbtor]{gap:var(--space-1);display:grid}.numbered-learning-item--titled[data-astro-cid-u7sqbtor] .numbered-learning-item__label[data-astro-cid-u7sqbtor]{font:650 var(--type-caption)/var(--leading-ui) var(--font-ui);text-wrap:auto}.numbered-learning-item__difficulty[data-astro-cid-u7sqbtor]{color:var(--text-secondary);font-family:var(--font-ui);font-size:var(--type-caption);font-weight:650;line-height:var(--leading-ui);border-inline-start:2px solid;align-items:center;padding-inline-start:var(--space-1);display:inline-flex}.numbered-learning-item__difficulty--core[data-astro-cid-u7sqbtor]{color:var(--success-700)}.numbered-learning-item__difficulty--optional[data-astro-cid-u7sqbtor]{color:var(--info-700)}.numbered-learning-item__difficulty--extension[data-astro-cid-u7sqbtor]{color:var(--warning-700)}.numbered-learning-item__body[data-astro-cid-u7sqbtor]>:first-child{margin-top:0}.numbered-learning-item__body[data-astro-cid-u7sqbtor]>:last-child{margin-bottom:0}
.oriented-annulus[data-astro-cid-u5eqohg4]{max-width:var(--width-illustration-hero);margin-inline:auto}
.venturi-arrows[data-astro-cid-5syluif5] line{stroke:var(--ink-900);stroke-width:5px}.venturi-arrowhead[data-astro-cid-5syluif5]{fill:var(--ink-900)}
.coordinate-arrow[data-astro-cid-6pm6gres]{fill:var(--ink-900)}.coordinate-bead[data-astro-cid-6pm6gres]{fill:var(--accent-500);stroke:var(--ink-900);stroke-width:2px}
.graph-edges[data-astro-cid-fzudz2nv] path{fill:none;stroke:var(--ink-600);stroke-width:2.5px}.graph-edges--optional[data-astro-cid-fzudz2nv] path{stroke-dasharray:7 6;marker-end:none}.graph-arrowhead[data-astro-cid-fzudz2nv]{fill:var(--ink-600)}
.model-arrows[data-astro-cid-yxybcot5] path{fill:none;stroke:var(--ink-600);stroke-width:2.5px}.model-arrowhead[data-astro-cid-yxybcot5]{fill:var(--ink-600)}
.inline-svg-figure .transition-levels{stroke:var(--ink-700);stroke-width:3px}.inline-svg-figure .transition-up{stroke:var(--accent-700);stroke-width:4px}.inline-svg-figure .transition-down{stroke:var(--info-700);stroke-width:4px}.inline-svg-figure .transition-up-head{fill:var(--accent-700)}.inline-svg-figure .transition-down-head{fill:var(--info-700)}
.rolling-dynamics-figure[data-astro-cid-zt2i66bd]{max-width:min(100%,30rem);margin-inline:auto}.rolling-forces[data-astro-cid-zt2i66bd] path{fill:none;stroke:var(--ink-900);stroke-width:2.5px}.rolling-motion[data-astro-cid-zt2i66bd] path{fill:none;stroke:var(--ink-900);stroke-width:2px;stroke-dasharray:6 4}
.reading-navigation[data-astro-cid-4sgbkqln],.reading-navigation[data-astro-cid-4sgbkqln] :is(p,ul,ol,summary){font-family:var(--font-ui);font-size:var(--type-meta);line-height:var(--leading-ui)}.reading-navigation[data-astro-cid-4sgbkqln]{margin-block:var(--space-4);overflow-wrap:anywhere}.reading-navigation[data-astro-cid-4sgbkqln] h2[data-astro-cid-4sgbkqln]{font-size:var(--type-subsection);margin-block:0 var(--space-2)}
.ipho-practice-ladder[data-astro-cid-67gcnjed]{border:1px solid var(--line-200);border-radius:var(--radius-card);background:var(--paper-card);margin:1.5rem 0;padding:1rem 1.2rem}.ipho-practice-ladder[data-astro-cid-67gcnjed] h2[data-astro-cid-67gcnjed]{margin-top:0;font-size:1.3rem}.ipho-practice-ladder[data-astro-cid-67gcnjed] li[data-astro-cid-67gcnjed]+li[data-astro-cid-67gcnjed]{margin-top:.45rem}.ipho-practice-ladder[data-astro-cid-67gcnjed] details[data-astro-cid-67gcnjed]{margin-top:1rem}.ipho-practice-ladder[data-astro-cid-67gcnjed] summary[data-astro-cid-67gcnjed]{cursor:pointer;font-weight:700}
.slit-screen[data-astro-cid-zpadcwzq]{max-width:var(--width-illustration-hero);margin-inline:auto}
.phasor-addition[data-astro-cid-xibga2gi]{max-width:var(--width-illustration-hero);margin-inline:auto}
.jones-time[data-astro-cid-fgkki6ej]{max-width:var(--width-illustration-hero);margin-inline:auto}
.lens-image-construction[data-astro-cid-t6hiq4pk].lens-image-phone,.lens-image-construction[data-astro-cid-t6hiq4pk].lens-image-phone .image-heading[data-astro-cid-t6hiq4pk],.lens-image-construction[data-astro-cid-t6hiq4pk].lens-image-phone .image-axis-label[data-astro-cid-t6hiq4pk]{font-size:18px}.lens-image-construction[data-astro-cid-t6hiq4pk]{font-family:var(--font-ui);fill:var(--ink-900);font-size:26px}.lens-image-construction[data-astro-cid-t6hiq4pk] .image-heading[data-astro-cid-t6hiq4pk]{font-size:29px;font-weight:700}.lens-image-construction[data-astro-cid-t6hiq4pk] .image-frame[data-astro-cid-t6hiq4pk]{fill:var(--paper-0);stroke:var(--line-300);stroke-width:2px}.lens-image-construction[data-astro-cid-t6hiq4pk] .image-axis[data-astro-cid-t6hiq4pk],.lens-image-construction[data-astro-cid-t6hiq4pk] .image-extension[data-astro-cid-t6hiq4pk]{stroke:var(--ink-600);stroke-width:2px;stroke-dasharray:8 6;fill:none}.lens-image-construction[data-astro-cid-t6hiq4pk] .image-lens[data-astro-cid-t6hiq4pk]{fill:var(--paper-200);stroke:var(--ink-700);stroke-width:3px}.lens-image-construction[data-astro-cid-t6hiq4pk] .image-axis-label[data-astro-cid-t6hiq4pk]{font-size:28px}.lens-image-construction[data-astro-cid-t6hiq4pk] .image-screen[data-astro-cid-t6hiq4pk]{fill:var(--paper-200);stroke:var(--ink-700);stroke-width:2px}.lens-image-construction[data-astro-cid-t6hiq4pk] .image-tick[data-astro-cid-t6hiq4pk]{stroke:var(--ink-700);stroke-width:2px}.lens-image-construction[data-astro-cid-t6hiq4pk] .image-parallel-ray[data-astro-cid-t6hiq4pk],.lens-image-construction[data-astro-cid-t6hiq4pk] .image-central-ray[data-astro-cid-t6hiq4pk]{stroke-width:4px;fill:none}.lens-image-construction[data-astro-cid-t6hiq4pk] .image-parallel-ray[data-astro-cid-t6hiq4pk]{stroke:var(--success-700)}.lens-image-construction[data-astro-cid-t6hiq4pk] .image-central-ray[data-astro-cid-t6hiq4pk]{stroke:var(--accent-700)}.lens-image-construction[data-astro-cid-t6hiq4pk] .image-ray-arrow[data-astro-cid-t6hiq4pk]{fill:context-stroke}.lens-image-construction[data-astro-cid-t6hiq4pk] .image-object[data-astro-cid-t6hiq4pk],.lens-image-construction[data-astro-cid-t6hiq4pk] .image-result[data-astro-cid-t6hiq4pk]{stroke:var(--danger-700);stroke-width:4px}.lens-image-construction[data-astro-cid-t6hiq4pk] .image-virtual[data-astro-cid-t6hiq4pk]{stroke-dasharray:8 6}.lens-image-construction[data-astro-cid-t6hiq4pk] .image-centre[data-astro-cid-t6hiq4pk]{fill:var(--ink-900)}
.pipe-boundary[data-astro-cid-e2wzj3mc]{max-width:var(--width-illustration-hero);margin-inline:auto}
.string-end-force[data-astro-cid-lwwm6dco]{max-width:var(--width-illustration-hero);margin-inline:auto}
.radioactivity-reading-frame[data-astro-cid-4gjimizb] .inline-svg-figure{max-width:100%}.exposure-comparison[data-astro-cid-4gjimizb] text[data-astro-cid-4gjimizb]{fill:var(--ink-900);font-family:var(--font-ui);font-size:26px}.exposure-comparison[data-astro-cid-4gjimizb] .heading[data-astro-cid-4gjimizb]{font-size:28px;font-weight:700}.exposure-comparison[data-astro-cid-4gjimizb] .small[data-astro-cid-4gjimizb]{font-size:24px}.exposure-comparison[data-astro-cid-4gjimizb] .frame[data-astro-cid-4gjimizb]{fill:var(--paper-0);stroke:var(--line-300);stroke-width:2px}.exposure-comparison[data-astro-cid-4gjimizb] .object[data-astro-cid-4gjimizb]{fill:var(--paper-200);stroke:var(--ink-600);stroke-width:2px}.exposure-comparison[data-astro-cid-4gjimizb] .source[data-astro-cid-4gjimizb]{fill:var(--paper-100);stroke:var(--warning-700);stroke-width:3px}.exposure-comparison[data-astro-cid-4gjimizb] .powder[data-astro-cid-4gjimizb]{fill:var(--warning-700);stroke:var(--ink-600);stroke-width:1.5px}.exposure-comparison[data-astro-cid-4gjimizb] .radiation[data-astro-cid-4gjimizb]{stroke:var(--accent-700);stroke-width:3px}.exposure-comparison[data-astro-cid-4gjimizb] .arrow-head[data-astro-cid-4gjimizb]{fill:var(--accent-700)}
.rubric-marker[data-astro-cid-puvsz6kt]{margin-top:var(--space-2);border:1px solid var(--line-200);border-radius:var(--radius-card)}.rubric-marker__body[data-astro-cid-puvsz6kt]{padding:0 var(--space-2) var(--space-2)}.rubric-marker__guidance[data-astro-cid-puvsz6kt]{padding:var(--space-2);border-left:3px solid var(--accent-600);background:var(--highlight-100)}.rubric-marker[data-astro-cid-puvsz6kt] fieldset[data-astro-cid-puvsz6kt]{border:0;min-width:0;padding:0}.rubric-marker[data-astro-cid-puvsz6kt] legend[data-astro-cid-puvsz6kt]{margin-bottom:var(--space-1);font-weight:700}.rubric-marker__points[data-astro-cid-puvsz6kt]{gap:var(--space-2);padding-left:var(--space-4);display:grid}.rubric-marker__point[data-astro-cid-puvsz6kt],.rubric-marker__unit[data-astro-cid-puvsz6kt]{gap:var(--space-2);grid-template-columns:auto 1fr;align-items:start;display:grid}.rubric-marker__point[data-astro-cid-puvsz6kt]{min-height:2.75rem;padding:var(--space-2);border:1px solid var(--line-200);border-radius:var(--radius-control)}.rubric-marker__unit[data-astro-cid-puvsz6kt]{margin:var(--space-1) 0 0 var(--space-2);color:var(--ink-700);font-size:var(--type-meta)}.rubric-marker[data-astro-cid-puvsz6kt] input[data-astro-cid-puvsz6kt]{width:1.15rem;height:1.15rem;accent-color:var(--accent-700);margin-top:.15rem}.rubric-marker__point[data-astro-cid-puvsz6kt],.rubric-marker__unit[data-astro-cid-puvsz6kt]{min-height:var(--control-height);cursor:pointer;font-family:var(--font-ui)}.rubric-marker__point[data-astro-cid-puvsz6kt]{border-color:var(--control-boundary);background:var(--surface-raised)}.rubric-marker__point[data-astro-cid-puvsz6kt]:hover{border-color:var(--accent-600);background:var(--surface-subtle)}.rubric-marker__point[data-astro-cid-puvsz6kt]:active{background:var(--selected-bg)}.rubric-marker__point[data-astro-cid-puvsz6kt]:has(input:checked){border-color:var(--accent-600);background:var(--selected-bg)}.rubric-marker__point[data-astro-cid-puvsz6kt]:has(input:focus-visible){outline:var(--focus-ring-width) solid var(--focus-ring-color);outline-offset:var(--focus-ring-offset)}.rubric-marker__button[data-astro-cid-puvsz6kt]{min-height:2.75rem;padding:var(--space-1) var(--space-3);border:1px solid var(--accent-700);border-radius:var(--radius-control);color:var(--action-fg);background:var(--action-bg);font:700 var(--type-control)/var(--leading-ui) var(--font-ui);cursor:pointer}.rubric-marker__button[data-astro-cid-puvsz6kt]:hover{background:var(--action-bg-hover)}.rubric-marker__button[data-astro-cid-puvsz6kt]:active{background:var(--action-bg-pressed)}.rubric-marker__result[data-astro-cid-puvsz6kt]{margin-top:var(--space-3);padding:var(--space-2);border:1px solid var(--line-200);border-radius:var(--radius-card);background:var(--paper-100)}.rubric-marker__feedback-label[data-astro-cid-puvsz6kt]{margin-bottom:var(--space-0);font-weight:700}.rubric-marker__result[data-astro-cid-puvsz6kt] ul[data-astro-cid-puvsz6kt]{margin-top:0}.rubric-marker__score[data-astro-cid-puvsz6kt]{font-weight:700}.rubric-marker[data-astro-cid-puvsz6kt] [data-astro-cid-puvsz6kt]:focus-visible{outline:var(--focus-ring-width) solid var(--focus-ring-color);outline-offset:var(--focus-ring-offset)}@media print{.rubric-marker__button[data-astro-cid-puvsz6kt]{display:none}}
.inline-svg-figure .iv-panel{fill:var(--paper-100);stroke:var(--line-300);stroke-width:1.5px}.inline-svg-figure .iv-axis{stroke:var(--ink-800);stroke-width:2px}.inline-svg-figure .iv-axis-head{fill:var(--ink-800)}.inline-svg-figure .iv-ohmic,.inline-svg-figure .iv-lamp,.inline-svg-figure .iv-diode-forward{fill:none;stroke:var(--accent-700);stroke-width:4px}.inline-svg-figure .iv-diode-reverse{fill:none;stroke:var(--ink-700);stroke-width:3px;stroke-dasharray:8 6}.inline-svg-figure .iv-point{fill:var(--paper-0);stroke:var(--accent-700);stroke-width:3px}