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50%}}@view-transition{navigation:auto}}::view-transition-old(root){animation-duration:var(--dur-slow);animation-timing-function:var(--ease-out)}::view-transition-new(root){animation-duration:var(--dur-slow);animation-timing-function:var(--ease-out)}.hf .h9-film{border-block:1px solid var(--line-subtle);background:var(--surface-2)}.hf .h9-head{max-width:44rem;margin-bottom:var(--space-7)}.hf .h9-film__frame{border:1px solid var(--line);border-radius:var(--radius-3);background:var(--surface-raised);box-shadow:var(--elev-soft), var(--elev-4);margin:0;overflow:hidden}.hf .h9-film__chrome{align-items:center;gap:var(--space-4);min-height:40px;padding:0 var(--space-4);border-bottom:1px solid var(--line-subtle);background:var(--surface-2);color:var(--ink-3);font:400 var(--text-xs) / 1 var(--font-body);display:flex}.hf .h9-film__dots{gap:var(--space-1);display:inline-flex}.hf .h9-film__dots i{border-radius:var(--radius-pill);background:var(--line-strong);width:8px;height:8px}.hf 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.h9-film__toggle[hidden]{display:none}.hf .h9-film__toggle:hover{border-color:var(--line-strong)}.hf .h9-film__icon{fill:currentColor;width:16px;height:16px}.hf .h9-film__toggle[data-state=playing] .h9-film__icon--play,.hf .h9-film__toggle:not([data-state=playing]) .h9-film__icon--pause{display:none}.hf .h9-film__chapters{gap:var(--space-2);scroll-snap-type:x proximity;scrollbar-width:none;flex:1;grid-auto-columns:minmax(10rem,1fr);grid-auto-flow:column;min-width:0;margin:0;padding:0;list-style:none;display:grid;overflow-x:auto}.hf .h9-film__chapters li{scroll-snap-align:start}.hf .h9-film__chapter{align-items:center;gap:var(--space-2);width:100%;min-height:44px;padding:0 var(--space-2) var(--space-1);border-radius:var(--radius-1);color:var(--ink-3);font:600 var(--text-sm) / 1.25 var(--font-body);text-align:left;cursor:pointer;background:0 0;border:0;display:flex;position:relative}.hf .h9-film__chapter:hover,.hf .h9-film__chapter[aria-current]{color:var(--ink)}.hf .h9-film__n{color:var(--ink-3);font:400 var(--text-xs) / 1 var(--font-data);font-variant-numeric:tabular-nums}.hf .h9-film__chapter[aria-current] .h9-film__n{color:var(--accent-text)}.hf .h9-film__progress{inset:auto var(--space-2) 0;border-radius:var(--radius-pill);background:var(--line-subtle);height:2px;position:absolute;overflow:hidden}.hf .h9-film__progress>span{background:var(--accent);transform-origin:0;height:100%;display:block;transform:scaleX(0)}.hf .h9-film__chapter[aria-current] .h9-film__progress{background:var(--line)}.hf .h9-film__cap{min-height:4.5em;padding:var(--space-3) var(--space-4) var(--space-4);border-top:1px solid var(--line-subtle);color:var(--ink-2);font:400 var(--text-sm) / 1.5 var(--font-body)}.hf .h9-film__cap [hidden]{display:none}.hf .h9-film__toggle:focus-visible{outline:var(--focus-ring-width) solid var(--focus-ring-color);outline-offset:var(--focus-ring-offset)}.hf .h9-film__chapter:focus-visible{outline:var(--focus-ring-width) solid var(--focus-ring-color);outline-offset:var(--focus-ring-offset)}.hf .h9-cover__hit:focus-visible{outline:var(--focus-ring-width) solid var(--focus-ring-color);outline-offset:var(--focus-ring-offset)}.hf .h9-track{border-top:0;grid-template-columns:none;gap:0;margin:0;display:grid;position:relative}.hf .h9-track:before{content:"";inset:var(--space-4) auto var(--space-4) calc(var(--space-4) - 1px);background:var(--line);transform-origin:top;width:2px;position:absolute}.hf .h9-track__step,.hf .h9-track__step[data-on]{align-items:start;gap:0 var(--space-4);min-height:0;padding:var(--space-2) 0 var(--space-4);color:var(--ink);background:0 0;border:0;border-radius:0;grid-template-columns:auto minmax(0,1fr);display:grid}.hf .h9-track__step .hv-track__n{z-index:1;border:1px solid var(--line-strong);background:var(--canvas);width:32px;height:32px;color:var(--ink-2);font:600 var(--text-xs) / 1 var(--font-body);grid-row:span 2;position:relative}.hf .h9-track__step[data-on] .hv-track__n{border-color:var(--accent);background:var(--accent);color:var(--accent-ink)}.hf .h9-track__step .hv-track__label{font:700 var(--text-lg) / 1.25 var(--font-display);align-self:center}.hf .h9-track__detail{color:var(--ink-2);font:400 var(--text-sm) / 1.45 var(--font-body)}@media (min-width:1000px){.hf .h9-track{gap:var(--space-4);grid-template-columns:repeat(8,minmax(0,1fr))}.hf .h9-track:before{inset:calc(var(--space-4) - 1px) calc((100% - 7 * var(--space-4)) / 8 - var(--space-4)) auto var(--space-4);transform-origin:0;width:auto;height:2px}.hf .h9-track__step,.hf .h9-track__step[data-on]{gap:var(--space-2);grid-template-columns:none;padding:0}.hf .h9-track__step .hv-track__n{margin-bottom:var(--space-2);grid-row:auto}.hf .h9-track__step .hv-track__label{font-size:var(--text-md);align-self:start}}@media (prefers-reduced-motion:no-preference){@supports (animation-timeline:view()){:root:not([data-reduced-motion=true]) .hf .h9-track:before{animation:linear both h9-draw-down;animation-timeline:view();animation-range:entry 20% cover 55%}}}@media (prefers-reduced-motion:no-preference) and (min-width:1000px){@supports (animation-timeline:view()){:root:not([data-reduced-motion=true]) .hf .h9-track:before{animation-name:h9-draw}}}.hf .h9-rail{gap:var(--space-4);margin:0 calc(-1 * var(--gutter)) var(--space-7);padding:var(--space-2) var(--gutter) var(--space-6);overscroll-behavior-x:contain;scroll-padding-inline:var(--gutter);scroll-snap-type:x mandatory;scrollbar-width:thin;grid-auto-columns:min(72vw,18rem);grid-auto-flow:column;list-style:none;display:grid;overflow-x:auto}@media (min-width:900px){.hf .h9-rail{grid-auto-columns:calc((100% - 3 * var(--space-4)) / 4)}}.hf .h9-cover{scroll-snap-align:start}.hf .h9-rail__nav{justify-content:flex-end;gap:var(--space-2);margin:calc(-1 * var(--space-4)) 0 var(--space-3);display:flex}.hf .h9-rail__nav[hidden]{display:none}.hf .h9-rail__btn{border:1px solid var(--line);border-radius:var(--radius-pill);background:var(--canvas);width:44px;height:44px;color:var(--ink);cursor:pointer;place-items:center;display:inline-grid}.hf .h9-rail__btn:hover:not(:disabled){border-color:var(--line-strong)}.hf .h9-rail__btn:disabled{color:var(--ink-4);cursor:default}.hf .h9-rail__btn[data-rail-step="-1"] svg{transform:scaleX(-1)}.hf .h9-rail__btn:focus-visible{outline:var(--focus-ring-width) solid var(--focus-ring-color);outline-offset:var(--focus-ring-offset)}.hf .h9-cover__hit{align-content:start;gap:var(--space-2);width:100%;height:100%;padding:0 0 var(--space-4);border:1px solid var(--line-subtle);border-radius:var(--radius-2);background:var(--surface-raised);color:var(--ink);font:inherit;text-align:left;cursor:pointer;transition:border-color var(--dur-fast) var(--ease-out);text-decoration:none;display:grid;overflow:hidden}.hf .h9-cover__hit:hover{border-color:var(--line-strong)}.hf .h9-cover__pic{aspect-ratio:16/10;background:var(--surface-2);display:block;overflow:hidden}.hf .h9-cover__pic img,.hf .h9-cover__pic picture{object-fit:cover;width:100%;height:100%;transition:transform var(--dur-slow) var(--ease-out);display:block}@media (prefers-reduced-motion:no-preference){:root:not([data-reduced-motion=true]) .hf .h9-cover__hit:hover .h9-cover__pic img{transform:scale(1.03)}}.hf .h9-cover__meta{align-items:center;gap:var(--space-2);padding:var(--space-2) var(--space-4) 0;color:var(--physics-text);font:600 var(--text-xs) / 1.3 var(--font-body);flex-wrap:wrap;display:flex}.hf .h9-cover[data-subject=biology] .h9-cover__meta{color:var(--biology-text)}.hf .h9-cover[data-subject=chemistry] .h9-cover__meta{color:var(--chemistry-text)}.hf .h9-cover__code{color:var(--ink-3)}.hf .h9-cover__free{padding:var(--space-1) var(--space-2);border-radius:var(--radius-pill);background:var(--tint-bio);color:var(--biology-text);margin-left:auto}.hf .h9-cover__title{padding:0 var(--space-4);font:700 var(--text-lg) / 1.25 var(--font-display)}.hf .h9-exam{background:var(--canvas)}@media (min-width:1000px){.hf .h9-exam__grid{grid-template-columns:minmax(0,1.25fr) minmax(0,1fr);align-items:start}}.hf .h9-chain{margin:var(--space-6) 0 0;border-top:1px solid var(--line);gap:0;padding:0;list-style:none;display:grid}.hf .h9-chain__step{align-items:baseline;gap:var(--space-3);padding:var(--space-3) 0;border-bottom:1px solid var(--line-subtle);grid-template-columns:2rem 5rem minmax(0,1fr);display:grid}.hf .h9-chain__n{color:var(--accent-text);font:400 var(--text-xs) / 1 var(--font-data)}.hf .h9-chain__k{font:700 var(--text-md) / 1.3 var(--font-display)}.hf .h9-chain__t{color:var(--ink-2);font:400 var(--text-sm) / 1.45 var(--font-body)}.hf .h9-exam__more{margin:var(--space-5) 0 var(--space-4);color:var(--ink-2)}.hf .h9-exam__shot{justify-self:center;width:100%;max-width:26rem;margin:0}.hf .h9-exam__pic{border:1px solid var(--line);border-radius:var(--radius-3);background:var(--surface-raised);box-shadow:var(--elev-soft);overflow:hidden}.hf .h9-exam__pic img{width:100%;height:auto;display:block}.hf .h9-exam__cap{margin-top:var(--space-3);color:var(--ink-3);font:400 var(--text-sm) / 1.45 var(--font-body)}.hf .h9-boards{border-top:1px solid var(--line-subtle)}.hf .h9-boards__list{gap:var(--space-4);margin:0;padding:0;list-style:none;display:grid}@media (min-width:800px){.hf .h9-boards__list{grid-template-columns:repeat(3,minmax(0,1fr))}}.hf .h9-board{padding:var(--space-5) 0 var(--space-4);border-top:2px solid var(--ink)}.hf .h9-board__name{margin:0 0 var(--space-4);font:700 var(--text-xl) / 1.2 var(--font-display)}.hf .h9-board__facts{gap:var(--space-4);grid-template-columns:repeat(2,minmax(0,1fr));display:grid}.hf .h9-boards__note{margin:var(--space-5) 0 0;color:var(--ink-3);font:400 var(--text-sm) / 1.45 var(--font-body)}.hf .h9-close{padding-top:var(--space-8)}.hf .h9-close__fig{box-sizing:border-box;width:calc(100% - 2 * var(--gutter));max-width:60rem;margin:0 auto var(--space-7)}.hf .h9-close__art{aspect-ratio:16/10;border:1px solid var(--line);border-radius:var(--radius-3);background:var(--canvas);box-shadow:var(--elev-soft);overflow:hidden}.hf .h9-close__art picture,.hf .h9-close__art img{object-fit:cover;width:100%;height:100%;display:block}.hf .h9-fig{margin:var(--space-3) 0 0;color:var(--ink-3);font:400 var(--text-sm) / 1.5 var(--font-body)}.hf .h9-fig__n{margin-right:var(--space-2);color:var(--ink-2);font:600 var(--text-xs) / 1 var(--font-data);letter-spacing:.04em;text-transform:uppercase}.hf .h9-close__in,.hf .hf-close .h9-close__in{text-align:center;grid-template-columns:none;justify-items:center}.hf .h9-close__in>*{grid-column:auto}.hf .h9-close .hf-close__actions{justify-items:center;gap:var(--space-4);display:grid}@media (forced-colors:active){.hf .h9-film__frame,.hf .h9-cover__hit,.hf .h9-exam__pic{border-color:canvastext}.hf .h9-film__progress>span{background:highlight}}.hf .h9-subjects{gap:var(--space-4);margin:0;padding:0;list-style:none;display:grid}@media (min-width:800px){.hf .h9-subjects{grid-template-columns:repeat(3,minmax(0,1fr))}}.hf .h9-subject{gap:var(--space-3);padding:var(--space-5);border:1px solid var(--line-subtle);border-top:4px solid var(--physics);border-radius:var(--radius-3);background:var(--surface-raised);flex-direction:column;display:flex}.hf .h9-subject[data-subject=biology]{border-top-color:var(--biology)}.hf .h9-subject[data-subject=chemistry]{border-top-color:var(--chemistry)}.hf .h9-subject__name{align-items:center;gap:var(--space-3);color:var(--ink);font:700 var(--text-xl) / 1.2 var(--font-display);margin:0;display:flex}.hf .h9-subject .hv-index__glyph{background:var(--surface-2);width:36px;height:36px}.hf .h9-subject__count{color:var(--ink-2);font:400 var(--text-sm) / 1.4 var(--font-body);margin:0}.hf .h9-subject__n{margin-right:var(--space-1);color:var(--ink);font:700 var(--text-2xl) / 1 var(--font-display);font-variant-numeric:tabular-nums}.hf .h9-subject__list{color:var(--ink-2);font:400 var(--text-md) / 1.5 var(--font-body);flex:1;margin:0}.hf .h9-subject .h9-subject__free{border-top:1px solid var(--line-subtle);background:0 0;border-radius:0;margin:0;overflow:visible}.hf .h9-subject .hv-row__hit{padding-left:0;padding-right:0}.hf .h9-subjects__all{margin-top:var(--space-6);justify-content:center;display:flex}.hf .h9-cover__pic{margin:var(--space-2) var(--space-2) 0;padding:var(--space-2);border-radius:var(--radius-2);background:var(--cover-mat)}.hf .h9-cover__pic img,.hf .h9-cover__pic picture{border-radius:var(--radius-1)}.hf .hv-price__card{flex-direction:column;display:flex}.hf .hv-price__what{flex:1}.hf .hv-price__go{margin:var(--space-5) 0 0}.hf .hv-price__go .hf-btn{justify-content:center;width:100%}:root,[data-theme=light]{--b-cobalt:#1f4fd8;--b-cobalt-deep:#173ea8;--b-cobalt-ink:#1d47c4;--b-cobalt-soft:#e8eefc;--b-teal:#14a3a0;--b-teal-ink:#0b7f7c;--b-teal-soft:#e3f5f4;--b-lime:#7ac943;--b-lime-ink:#3f7d14;--b-lime-soft:#eef8e4;--b-bg:#fff;--b-bg-soft:#f3f6fb;--b-surface:#fff;--b-surface-2:#f7f9fd;--b-ink:#0f1a33;--b-ink-2:#44506a;--b-ink-3:#5d6984;--b-line:#e3e8f2;--b-line-strong:#cfd7e6;--b-on-cobalt:#fff;--b-on-cobalt-2:#ffffffd1;--b-band:linear-gradient(135deg, #2457e6 0%, #1f4fd8 45%, #173ea8 100%);--b-band-card:#ffffff14;--b-band-card-hover:#ffffff24;--b-band-line:#fff3;--b-band-deep:linear-gradient(120deg, #0f1f5c 0%, #15338f 42%, #0f6e86 100%);--b-purple:#7b4fd6;--b-tint-lab:linear-gradient(160deg, #eaf1ff 0%, #d8e5ff 55%, #c7d9ff 100%);--b-tint-practise:linear-gradient(160deg, #f6fbe9 0%, #e7f6cf 55%, #d7efb4 100%);--b-tint-course:linear-gradient(160deg, #eefaf6 0%, #d9f3ea 55%, #c4ecdf 100%);--b-tint-line:#0f1a330f;--b-bio:#2f9e5b;--b-chem:#7b4fd6;--b-phys:#2d7ff0;--b-bio-ink:#237a46;--b-chem-ink:#6a3fc4;--b-phys-ink:#1b64c9;--b-bio-soft:#e6f5ec;--b-chem-soft:#efe9fb;--b-phys-soft:#e6f0fe;--b-radius:20px;--b-radius-md:16px;--b-radius-sm:12px;--b-radius-pill:999px;--b-shadow:0 1px 2px #1018280f, 0 8px 24px #10182814;--b-shadow-lift:0 2px 4px #1018280f, 0 16px 40px #1018281f;--b-shadow-cta:0 1px 2px #173ea833, 0 8px 20px #1f4fd847;--b-focus:0 0 0 2px var(--b-bg), 0 0 0 4px var(--b-cobalt);--b-font:"Instrument Sans", system-ui, -apple-system, "Segoe UI", sans-serif;--b-font-serif:"Newsreader", "Iowan Old Style", Georgia, serif;--b-font-hand:"Caveat", "Segoe Print", "Bradley Hand", cursive;--b-font-num:"IBM Plex Mono", "JetBrains Mono", ui-monospace, Menlo, monospace;--b-h1:clamp(2.5rem, 1.6rem + 3.6vw, 4.5rem);--b-h2:clamp(1.75rem, 1.35rem + 1.6vw, 2.5rem);--b-h3:1.375rem;--b-text-lg:1.1875rem;--b-text:1rem;--b-text-sm:.875rem;--b-text-xs:.8125rem;--b-ease:cubic-bezier(.2, .7, .2, 1);--b-dur:.18s;--dh-navy-950:#050f28;--dh-navy-900:#081738;--dh-navy-800:#0c2149;--dh-navy-700:#12305f;--dh-blue:#1a66f0;--dh-blue-hover:#2f78ff;--dh-glow:#2d8cff;--dh-lime:#c5f24b;--dh-lime-hover:#d6f875;--dh-on-lime:#081738;--dh-on-dark:#fff;--dh-on-dark-2:#ffffffd6;--dh-on-dark-3:#ffffffb3;--dh-line-on-dark:#ffffff29;--dh-hero-fallback:radial-gradient(60% 70% at 78% 18%, #1c5bb8 0%, transparent 70%), radial-gradient(40% 50% at 12% 88%, #1673d9 0%, transparent 72%), linear-gradient(180deg, #081738 0%, #0a1f4a 58%, #0c2a5e 100%);--dh-hero-scrim:linear-gradient(90deg, #050f28db 0%, #050f2894 42%, #050f281f 100%), linear-gradient(180deg, #050f2880 0%, transparent 26%, transparent 70%, #081738db 100%);--dh-hero-scrim-phone:linear-gradient(180deg, #050f28c7 0%, #050f28b3 60%, #081738e6 100%);--dh-band:linear-gradient(115deg, #081738 0%, #0c2a5e 56%, #0e3a7c 100%);--dh-strip:#081a40;--dh-glass:linear-gradient(160deg, #2848849e 0%, #0e2048bd 100%);--dh-glass-line:#ffffff47;--dh-tick:#5fd35f;--dh-teal-hero:linear-gradient(100deg, #061a33 0%, #07263f 46%, #0a3a4f 100%);--dh-teal-scrim:linear-gradient(90deg, #061d36 0%, #061d36d1 34%, #061d3600 62%);--dh-chip-biology:#c5f24b;--dh-chip-chemistry:#2bd9d6;--dh-chip-physics:#7a55f0;--dh-chip-on:#081738;--dh-chip-on-physics:#fff;--dh-metal:linear-gradient(180deg, #2b3243 0%, #151a26 100%);--dh-metal-base:linear-gradient(180deg, #c5cbd8 0%, #8c94a6 62%, #6a7284 100%);--dh-screen:#0a0f1c;--dh-device-drop:0 24px 40px #0208188c;--dh-radius-tick:6px;--dh-radius-screen:4px;--dh-radius-tablet:8px;--dh-ground:#f6f8fc;--dh-card:#fff;--dh-card-line:#e3e8f2;--dh-card-ink:#0d1b3e;--dh-card-ink-2:#48546e;--dh-teal-ink:#0a7a77;--dh-blue-ink:#1558d6;--dh-purple-ink:#6535c4;--dh-wash-teal:linear-gradient(180deg, #bdeee8 0%, #dcf6f2 62%, #fff 100%);--dh-wash-blue:linear-gradient(180deg, #bfdcff 0%, #deecff 62%, #fff 100%);--dh-wash-purple:linear-gradient(180deg, #d8c9fb 0%, #ece4fd 62%, #fff 100%);--dh-lens-glass:#eef6fb;--dh-lens-ink:#0d1b3e;--dh-lens-liquid:#2a8fe0;--elev-dh-card:0 1px 2px #0d1b3e0a, 0 8px 24px #0d1b3e0f;--elev-dh-card-lift:0 2px 4px #0d1b3e0f, 0 20px 48px #0d1b3e26;--elev-dh-lime:0 6px 24px #c5f24b52;--elev-dh-device:0 24px 64px #02081899;--elev-dh-glass:0 24px 56px #02081880, inset 0 1px 0 #fff3;--elev-dh-lens:0 8px 24px #0d1b3e38;--focus-dh:0 0 0 2px var(--dh-navy-900), 0 0 0 5px var(--dh-lime);--focus-dh-card:0 0 0 2px var(--dh-ground), 0 0 0 5px var(--dh-blue);--dh-h1:clamp(2.5rem, min(4.2vw, 8vh), 4.5rem);--dh-h1-page:clamp(2.25rem, min(4.2vw, 7.6vh), 4rem);--dh-h1-sub:clamp(2.25rem, min(3.6vw, 7vh), 3.5rem);--dh-sheet-radius:32px;--dh-h3-section:2rem;--dh-h2:clamp(1.75rem, 1.3rem + 1.7vw, 2.75rem);--dh-h3:clamp(1.375rem, 1.25rem + .4vw, 1.625rem);--dh-bar-h:56px;--dh-bar:color-mix(in srgb, var(--dh-navy-900) 90%, transparent);--dh-column:1360px;--dh-gutter:clamp(16px, 4.4vw, 64px);--dh-edge:max(var(--dh-gutter), calc((100% - var(--dh-column)) / 2 + var(--dh-gutter)))}@media (prefers-color-scheme:dark){:root:not([data-theme=light]){--b-cobalt:#3a64e6;--b-cobalt-deep:#2f55cc;--b-cobalt-ink:#8eabff;--b-cobalt-soft:#17244a;--b-teal:#3cc7c3;--b-teal-ink:#5fd6d2;--b-teal-soft:#0f2d33;--b-lime:#93db5f;--b-lime-ink:#a6e47a;--b-lime-soft:#1a2a17;--b-bg:#0b1220;--b-bg-soft:#0e1628;--b-surface:#121a2b;--b-surface-2:#172036;--b-ink:#eef2fb;--b-ink-2:#c3cbe0;--b-ink-3:#9aa5c0;--b-line:#222d45;--b-line-strong:#2f3b57;--b-on-cobalt:#fff;--b-on-cobalt-2:#fffc;--b-band:linear-gradient(135deg, #12235a 0%, #0f1d4b 50%, #0b1638 100%);--b-band-card:#ffffff0f;--b-band-card-hover:#ffffff1a;--b-band-line:#ffffff24;--b-band-deep:linear-gradient(120deg, #0a1438 0%, #0f2366 45%, #0b4d5e 100%);--b-purple:#a585f0;--b-tint-lab:linear-gradient(160deg, #15224a 0%, #142350 55%, #13265a 100%);--b-tint-practise:linear-gradient(160deg, #18261a 0%, #1b2f1c 55%, #1e371f 100%);--b-tint-course:linear-gradient(160deg, #0f2a29 0%, #11312f 55%, #133936 100%);--b-tint-line:#ffffff14;--b-bio-ink:#6fd396;--b-chem-ink:#b99bf5;--b-phys-ink:#7fb2ff;--b-bio-soft:#13291d;--b-chem-soft:#221a3a;--b-phys-soft:#13223d;--b-shadow:0 1px 2px #0006, 0 8px 24px #00000059;--b-shadow-lift:0 2px 4px #0006, 0 16px 40px #00000073;--b-shadow-cta:0 1px 2px #0006, 0 8px 20px #4f7bff4d;--b-focus:0 0 0 2px var(--b-bg), 0 0 0 4px #ffd566;--dh-ground:#081738;--dh-card:#0f2149;--dh-card-line:#ffffff1f;--dh-card-ink:#fff;--dh-card-ink-2:#ffffffc7;--dh-teal-ink:#6fe0da;--dh-blue-ink:#8fbcff;--dh-purple-ink:#c3adff;--dh-wash-teal:linear-gradient(180deg, #125a63 0%, #103f55 62%, #0f2149 100%);--dh-wash-blue:linear-gradient(180deg, #17498f 0%, #13346f 62%, #0f2149 100%);--dh-wash-purple:linear-gradient(180deg, #41308f 0%, #2a2569 62%, #0f2149 100%);--elev-dh-card:0 12px 32px #02081866;--elev-dh-card-lift:0 20px 48px #0208188c;--focus-dh-card:0 0 0 2px var(--dh-ground), 0 0 0 5px var(--dh-lime)}}:root[data-theme=dark],[data-theme=dark]{--b-cobalt:#3a64e6;--b-cobalt-deep:#2f55cc;--b-cobalt-ink:#8eabff;--b-cobalt-soft:#17244a;--b-teal:#3cc7c3;--b-teal-ink:#5fd6d2;--b-teal-soft:#0f2d33;--b-lime:#93db5f;--b-lime-ink:#a6e47a;--b-lime-soft:#1a2a17;--b-bg:#0b1220;--b-bg-soft:#0e1628;--b-surface:#121a2b;--b-surface-2:#172036;--b-ink:#eef2fb;--b-ink-2:#c3cbe0;--b-ink-3:#9aa5c0;--b-line:#222d45;--b-line-strong:#2f3b57;--b-on-cobalt:#fff;--b-on-cobalt-2:#fffc;--b-band:linear-gradient(135deg, #12235a 0%, #0f1d4b 50%, #0b1638 100%);--b-band-card:#ffffff0f;--b-band-card-hover:#ffffff1a;--b-band-line:#ffffff24;--b-band-deep:linear-gradient(120deg, #0a1438 0%, #0f2366 45%, #0b4d5e 100%);--b-purple:#a585f0;--b-tint-lab:linear-gradient(160deg, #15224a 0%, #142350 55%, #13265a 100%);--b-tint-practise:linear-gradient(160deg, #18261a 0%, #1b2f1c 55%, #1e371f 100%);--b-tint-course:linear-gradient(160deg, #0f2a29 0%, #11312f 55%, #133936 100%);--b-tint-line:#ffffff14;--b-bio-ink:#6fd396;--b-chem-ink:#b99bf5;--b-phys-ink:#7fb2ff;--b-bio-soft:#13291d;--b-chem-soft:#221a3a;--b-phys-soft:#13223d;--b-shadow:0 1px 2px #0006, 0 8px 24px #00000059;--b-shadow-lift:0 2px 4px #0006, 0 16px 40px #00000073;--b-shadow-cta:0 1px 2px #0006, 0 8px 20px #4f7bff4d;--b-focus:0 0 0 2px var(--b-bg), 0 0 0 4px #ffd566;--dh-ground:#081738;--dh-card:#0f2149;--dh-card-line:#ffffff1f;--dh-card-ink:#fff;--dh-card-ink-2:#ffffffc7;--dh-teal-ink:#6fe0da;--dh-blue-ink:#8fbcff;--dh-purple-ink:#c3adff;--dh-wash-teal:linear-gradient(180deg, #125a63 0%, #103f55 62%, #0f2149 100%);--dh-wash-blue:linear-gradient(180deg, #17498f 0%, #13346f 62%, #0f2149 100%);--dh-wash-purple:linear-gradient(180deg, #41308f 0%, #2a2569 62%, #0f2149 100%);--elev-dh-card:0 12px 32px #02081866;--elev-dh-card-lift:0 20px 48px #0208188c;--focus-dh-card:0 0 0 2px var(--dh-ground), 0 0 0 5px var(--dh-lime)}.b-page{background:var(--b-bg);color:var(--b-ink);font-family:var(--b-font)}.b-wrap{width:min(100% - 32px,1240px);margin-left:auto;margin-right:auto}.b-h1{font-family:var(--b-font);font-size:var(--b-h1);letter-spacing:-.035em;color:var(--b-ink);text-wrap:balance;margin:0;font-weight:700;line-height:1.02}.b-h2{font-family:var(--b-font);font-size:var(--b-h2);letter-spacing:-.025em;color:var(--b-ink);text-wrap:balance;margin:0;font-weight:700;line-height:1.1}.b-lede{font-size:var(--b-text-lg);color:var(--b-ink-2);text-wrap:pretty;margin:0;line-height:1.5}.b-kicker{font-size:var(--b-text-sm);letter-spacing:.02em;color:var(--b-cobalt-ink);margin:0;font-weight:600}.b-hl{color:var(--b-teal-ink)}.b-serif{font-family:var(--b-font-serif);letter-spacing:-.02em;color:var(--b-cobalt-ink);font-style:italic;font-weight:600}.b-hand{font-family:var(--b-font-hand);color:var(--b-ink-2);font-size:1.375rem;font-weight:600;line-height:1.1}.b-num{font-family:var(--b-font-num);font-variant-numeric:tabular-nums}@media screen{html:root,html [data-theme]{--font-data:var(--b-font);--b-font-num:var(--b-font)}html .rx-data{font-family:var(--b-font);font-variant-numeric:tabular-nums}html .ph{--ph-mono:var(--b-font)}html .rx{--rx-mono:var(--b-font)}}.b-card{background:var(--b-surface);color:var(--b-ink);border:1px solid var(--b-line);border-radius:var(--b-radius);box-shadow:var(--b-shadow)}.b-card--hover{transition:transform var(--b-dur) var(--b-ease), box-shadow var(--b-dur) var(--b-ease)}.b-card--hover:hover{box-shadow:var(--b-shadow-lift);transform:translateY(-2px)}.b-band{background:var(--b-band);color:var(--b-on-cobalt)}.b-band--deep{isolation:isolate;background:var(--b-band-deep);position:relative}.b-lines{z-index:-1;fill:none;stroke:#ffffff24;stroke-width:1.25px;pointer-events:none;width:100%;height:100%;position:absolute;top:0;bottom:0;left:0;right:0}.b-band__card{background:var(--b-band-card);border:1px solid var(--b-band-line);border-radius:var(--b-radius);color:var(--b-on-cobalt);transition:background var(--b-dur) var(--b-ease), transform var(--b-dur) var(--b-ease)}.b-band__card:hover{background:var(--b-band-card-hover)}.b-tint{border:1px solid var(--b-tint-line);border-radius:var(--b-radius);color:var(--b-ink);background:var(--b-tint-lab)}.b-tint--lab{background:var(--b-tint-lab)}.b-tint--practise{background:var(--b-tint-practise)}.b-tint--course{background:var(--b-tint-course)}.b-tab{border-radius:var(--b-radius) var(--b-radius) 0 0;background:var(--b-cobalt);min-height:56px;color:var(--b-on-cobalt);font-size:var(--b-text-sm);letter-spacing:.06em;text-transform:uppercase;align-items:center;gap:12px;padding:8px 20px 8px 12px;font-weight:700;display:flex}.b-tab .b-icon{background:#fff;width:40px;height:40px}.b-tab .b-icon svg{width:20px;height:20px}.b-tab--teal{background:#0c7d7a}.b-tab--teal .b-icon{color:#0b7f7c}.b-tab--cobalt{background:#1f4fd8}.b-tab--cobalt .b-icon{color:#1d47c4}.b-tab--purple{background:#6a3fc4}.b-tab--purple .b-icon{color:#6a3fc4}.b-ticks{gap:8px;margin:0;padding:0;list-style:none;display:grid}.b-ticks>*{padding-left:28px;line-height:1.4;position:relative}.b-ticks>:before{content:"";background:var(--b-bio) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 20 20'%3E%3Cpath d='M5.5 10.5l3 3 6-7' fill='none' stroke='white' stroke-width='2.2' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E") center / 20px no-repeat;border-radius:50%;width:20px;height:20px;position:absolute;top:.1em;left:0}.b-btn{border-radius:var(--b-radius-pill);min-height:44px;font:inherit;font-size:var(--b-text);cursor:pointer;transition:background var(--b-dur) var(--b-ease), transform var(--b-dur) var(--b-ease), box-shadow var(--b-dur) var(--b-ease), border-color var(--b-dur) var(--b-ease);border:1px solid #0000;justify-content:center;align-items:center;gap:10px;padding:0 24px;font-weight:600;line-height:1;text-decoration:none;display:inline-flex}.b-btn:focus-visible{box-shadow:var(--b-focus);outline:none}.b-btn svg{transition:transform var(--b-dur) var(--b-ease);flex:none}.b-btn:hover svg{transform:translate(2px)}.b-btn--lg{min-height:56px;font-size:var(--b-text-lg);padding:0 32px}.b-btn--cta{background:var(--b-cobalt);color:var(--b-on-cobalt);box-shadow:var(--b-shadow-cta)}.b-btn--cta:hover{background:var(--b-cobalt-deep);transform:translateY(-1px)}.b-btn--cta:focus-visible{box-shadow:var(--b-focus), var(--b-shadow-cta)}.b-band .b-btn--cta{background:var(--b-lime);color:#10230a;box-shadow:0 1px 2px #0003,0 8px 20px #7ac9434d}.b-band .b-btn--cta:hover{background:#8bd655}.b-band .b-card .b-btn--cta{background:var(--b-cobalt);color:var(--b-on-cobalt);box-shadow:var(--b-shadow-cta)}.b-band .b-card .b-btn--cta:hover{background:var(--b-cobalt-deep)}.b-btn--ghost{background:var(--b-surface);color:var(--b-cobalt-ink);border-color:var(--b-cobalt)}.b-btn--ghost:hover{background:var(--b-cobalt-soft)}.b-btn--round{background:var(--b-surface);width:44px;height:44px;min-height:44px;color:var(--b-cobalt-ink);border-color:var(--b-line);box-shadow:var(--b-shadow);padding:0}.b-band .b-btn--round{color:var(--b-cobalt-deep);background:#fff;border-color:#0000}@media (prefers-color-scheme:dark){:root:not([data-theme=light]) .b-btn--round{background:var(--b-cobalt);color:#fff;border-color:#0000}}:root[data-theme=dark] .b-btn--round{background:var(--b-cobalt);color:#fff;border-color:#0000}.b-chip{border-radius:var(--b-radius-pill);background:var(--b-cobalt-soft);min-height:28px;color:var(--b-cobalt-ink);font-size:var(--b-text-xs);align-items:center;gap:8px;padding:0 12px;font-weight:600;line-height:1;display:inline-flex}.b-icon{background:var(--b-cobalt-soft);width:56px;height:56px;color:var(--b-cobalt-ink);border-radius:50%;flex:none;place-items:center;display:inline-grid}.b-icon svg{width:26px;height:26px}.b-chip--cobalt,.b-icon--cobalt{background:var(--b-cobalt-soft);color:var(--b-cobalt-ink)}.b-chip--teal,.b-icon--teal{background:var(--b-teal-soft);color:var(--b-teal-ink)}.b-chip--lime,.b-icon--lime{background:var(--b-lime-soft);color:var(--b-lime-ink)}.b-chip--bio,.b-icon--bio{background:var(--b-bio-soft);color:var(--b-bio-ink)}.b-chip--chem,.b-icon--chem{background:var(--b-chem-soft);color:var(--b-chem-ink)}.b-chip--phys,.b-icon--phys{background:var(--b-phys-soft);color:var(--b-phys-ink)}[data-subject=biology]{--b-subject:var(--b-bio);--b-subject-ink:var(--b-bio-ink);--b-subject-soft:var(--b-bio-soft)}[data-subject=chemistry]{--b-subject:var(--b-chem);--b-subject-ink:var(--b-chem-ink);--b-subject-soft:var(--b-chem-soft)}[data-subject=physics]{--b-subject:var(--b-phys);--b-subject-ink:var(--b-phys-ink);--b-subject-soft:var(--b-phys-soft)}@media (prefers-reduced-motion:reduce){.b-card--hover,.b-band__card,.b-btn,.b-btn svg{transition:none}.b-card--hover:hover,.b-btn--cta:hover,.b-btn:hover svg{transform:none}}.dh-wrap{box-sizing:border-box;width:min(100%, var(--dh-column));padding-inline:var(--dh-gutter);margin-left:auto;margin-right:auto}.dh-h1{color:var(--dh-on-dark);font:700 var(--dh-h1) / 1.04 var(--b-font);letter-spacing:-.035em;margin:0}.dh-h1__line{display:block}.dh-lime{color:var(--dh-lime)}.dh-h2{color:var(--dh-on-dark);font:700 var(--dh-h2) / 1.12 var(--b-font);letter-spacing:-.025em;margin:0}.dh-note{color:var(--dh-on-dark-2);font-size:var(--b-text-sm);margin:0}.dh-btn{border-radius:var(--b-radius-pill);min-height:48px;font:700 var(--b-text) / 1.2 var(--b-font);cursor:pointer;transition:background-color var(--b-dur) var(--b-ease), transform var(--b-dur) var(--b-ease);border:0;justify-content:center;align-items:center;gap:12px;padding:12px 32px;text-decoration:none;display:inline-flex}.dh-btn--lime{background:var(--dh-lime);min-height:56px;box-shadow:var(--elev-dh-lime);color:var(--dh-on-lime);font-size:var(--b-text-lg)}.dh-btn--lime:hover{background:var(--dh-lime-hover);color:var(--dh-on-lime);transform:translateY(-1px)}.dh-btn--blue{background:var(--dh-blue);color:var(--dh-on-dark)}.dh-btn--blue:hover{background:var(--dh-blue-hover);color:var(--dh-on-dark)}.dh-btn:focus-visible{box-shadow:var(--focus-dh);outline:0}.dh-link:focus-visible{box-shadow:var(--focus-dh);outline:0}.dh-arrow{flex:none}.dh-art{background:var(--dh-hero-fallback);position:absolute;top:0;bottom:0;left:0;right:0;overflow:hidden}.dh-art picture{display:contents}.dh-art img{object-fit:cover;width:100%;height:100%;position:absolute;top:0;bottom:0;left:0;right:0}.dh-art__scrim{background:var(--dh-hero-scrim);position:absolute;top:0;bottom:0;left:0;right:0}@media (max-width:999.98px){.dh-art__scrim{background:var(--dh-hero-scrim-phone)}}.dh-art--cta 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0}@media (max-width:999.98px){.dh-hero__in{flex-direction:column;display:flex}.dh-hero__stage{margin-top:32px}}.dh-screen{background:var(--dh-screen);position:relative;overflow:hidden}.dh-screen img,.dh-screen video{object-fit:cover;object-position:top left;width:100%;height:100%;display:block}.dh-screen video{opacity:0;transition:opacity .4s var(--b-ease);position:absolute;top:0;bottom:0;left:0;right:0}[data-playing] .dh-screen video{opacity:1}.dh-laptop{filter:drop-shadow(var(--dh-device-drop))}.dh-laptop__lid{border-radius:var(--b-radius-md) var(--b-radius-md) 0 0;background:var(--dh-metal);padding:2% 2% 2.4%}.dh-screen--laptop{aspect-ratio:16/10;border-radius:var(--dh-radius-screen)}.dh-laptop__base{border-radius:0 0 var(--b-radius-md) 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