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clamp(32px,1.5rem + 2vw,56px);background:var(--c-surface-muted);border-bottom:var(--border-w) solid var(--c-line)}.page-header h1{max-width:18ch;font-size:var(--h1-page)}.page-header .lead{max-width:60ch;margin-top:16px}.document-version{display:inline-block;margin-top:18px;padding:4px 12px;border-radius:var(--radius-sm);background:var(--c-surface);border:var(--border-w) solid var(--c-line);color:var(--c-ink-muted);font-size:var(--text-xs);font-weight:800}.doc-layout{display:grid;gap:32px;padding-block:40px var(--section-space)}.doc-toc{align-self:start;padding:20px;border:var(--border-w) solid var(--c-line);border-radius:var(--radius-lg)}.doc-toc-title{margin-bottom:10px;font-size:var(--text-sm);font-weight:900}.doc-toc ol{display:grid;gap:2px;margin:0;padding-left:1.4em;color:var(--c-ink-muted);font-size:var(--text-sm)}.doc-toc li{padding-block:4px;line-height:1.4}.doc-toc a{display:inline;color:var(--c-ink-muted);font-weight:700;text-decoration:none}.doc-toc a:hover{color:var(--c-primary);text-decoration:underline}@media(min-width:1000px){.doc-layout{grid-template-columns:260px minmax(0,1fr);gap:64px;padding-top:56px}.doc-toc{position:sticky;top:calc(var(--header-height) + 24px);padding:0;border:0}}.prose{max-width:72ch;font-weight:500}.prose h2{margin:48px 0 14px;font-size:1.5rem;scroll-margin-top:calc(var(--header-height) + 24px)}.prose h2:first-child{margin-top:0}.prose p,.prose li{color:color-mix(in srgb,var(--c-ink) 86%,var(--c-background))}.prose p+p{margin-top:1em}.prose ul{margin:0;padding-left:1.2em}.prose li{margin-bottom:12px;padding-left:4px}.prose strong{color:var(--c-ink);font-weight:800}.support-grid{display:grid;gap:32px;padding-block:40px 32px}.contact-card h2,.support-faq h2{margin-bottom:14px;font-size:1.6rem}.contact-card>p{margin-bottom:1em;color:var(--c-ink-muted)}.contact-email{display:inline-block;color:var(--c-primary);font-size:clamp(1.25rem,1.1rem + .8vw,1.6rem);font-weight:900;text-decoration:none;overflow-wrap:anywhere}.support-faq .faq{max-width:none}.quick-links{padding-bottom:var(--section-space)}@media(min-width:960px){.support-grid{grid-template-columns:minmax(0,.9fr) minmax(0,1.1fr);gap:56px;padding-top:56px;align-items:start}}.account-layout{max-width:720px;padding-block:40px var(--section-space)}.account-shell{margin:0}.account-shell .button{margin-top:8px}.error-page{padding-block:clamp(64px,4rem + 4vw,140px);text-align:center}.error-inner{display:flex;flex-direction:column;align-items:center}.error-code{color:var(--c-primary-container-deep);font-size:clamp(5.5rem,4rem + 8vw,10rem);font-weight:900;line-height:.9;letter-spacing:-.05em}.error-page h1{margin-top:12px;font-size:var(--h1-page)}.error-page .lead{max-width:46ch;margin-top:16px}.error-page .actions{justify-content:center}.hero{position:relative;overflow:hidden;padding-block:clamp(40px,2rem + 4vw,96px) clamp(56px,3rem + 4vw,112px)}.hero-grid{display:grid;gap:56px;align-items:center}.hero h1 em{font-style:normal;color:var(--c-primary);background:linear-gradient(transparent 64%,var(--highlight) 64%,var(--highlight) 92%,transparent 92%)}.hero .lead{max-width:56ch;margin-top:24px}.hero .actions{margin-top:36px}.fineprint{max-width:48ch;margin-top:18px;color:var(--c-ink-muted);font-size:var(--text-sm)}.eyebrow-pill{display:inline-flex;align-items:center;gap:10px;margin-bottom:24px;padding:6px 14px 6px 12px;border:var(--border-w) solid var(--c-line);border-radius:var(--radius-pill);background:var(--c-surface);color:var(--c-ink);letter-spacing:.02em;text-transform:none;font-size:var(--text-sm)}.status-dot{position:relative;width:10px;height:10px;border-radius:50%;background:var(--c-success)}.status-dot:after{content:"";position:absolute;inset:-4px;border-radius:50%;border:2px solid var(--c-success);opacity:0;animation:ping 2.4s var(--ease-out) infinite}@keyframes ping{0%{transform:scale(.6);opacity:.7}70%,to{transform:scale(1.5);opacity:0}}@media(min-width:960px){.hero-grid{grid-template-columns:minmax(0,1.08fr) minmax(0,.92fr);gap:48px}}.hero-visual{position:relative;display:grid;place-items:center;padding:24px 8px 32px;isolation:isolate}.hero-visual:before{content:"";position:absolute;z-index:-1;inset:6% 4% 4%;border-radius:48px;background:var(--c-primary-container);transform:rotate(-4deg);box-shadow:0 10px 0 var(--c-primary-container-deep)}.phone{width:min(300px,78vw);border:10px solid var(--phone-frame);border-radius:46px;background:var(--c-surface);box-shadow:var(--shadow-float);animation:rise var(--motion-progress) var(--ease-out) both}.phone-screen{display:flex;flex-direction:column;gap:16px;padding:22px 16px 12px;border-radius:36px;overflow:hidden;color:var(--c-ink);font-size:14px}.app-stats{display:flex;justify-content:space-between;align-items:center;padding-inline:2px}.app-stat{display:inline-flex;align-items:center;gap:4px;color:var(--tone);font-size:17px;font-weight:900;font-variant-numeric:tabular-nums}.app-stat .icon{width:22px;height:22px}.app-stat small{align-self:flex-start;font-size:11px;font-weight:900}.app-stat.tone-neutral{position:relative;color:var(--c-ink)}.app-stat .dot{position:absolute;top:1px;right:1px;width:7px;height:7px;border-radius:50%;background:var(--c-danger);box-shadow:0 0 0 2px var(--c-surface)}.app-today{display:flex;align-items:center;gap:14px}.ring-wrap{position:relative;display:grid;place-items:center;width:108px;aspect-ratio:1;flex-shrink:0}.ring-wrap.is-small{width:92px}.ring{position:absolute;inset:0;transform:rotate(-90deg)}.ring-track,.ring-fill{fill:none;stroke-width:10}.ring-track{stroke:var(--c-primary-container)}.ring-fill{stroke:var(--c-primary);stroke-linecap:round;animation:fill var(--motion-progress) var(--ease-out) both .2s}@keyframes fill{0%{stroke-dasharray:0 100}}.ring-label{display:flex;flex-direction:column;align-items:center;line-height:1}.ring-label b{font-size:30px;font-variant-numeric:tabular-nums}.is-small .ring-label b{font-size:24px}.ring-label small{margin-top:4px;color:var(--c-ink-muted);font-size:12px;font-weight:800}.app-button{display:grid;place-items:center;flex:1;min-height:48px;padding:8px 12px;border-radius:var(--radius-md);background:var(--c-primary);color:var(--c-on-primary);box-shadow:0 var(--ledge) 0 var(--c-primary-deep);font-size:16px;font-weight:900}.app-title{margin-top:4px;font-size:15px;font-weight:900}.app-subjects{display:grid;gap:12px}.app-subjects li{display:grid;grid-template-columns:1fr 44%;align-items:center;gap:10px;font-size:13px;font-weight:800}.bar{display:block;height:10px;border-radius:var(--radius-pill);background:var(--c-surface-muted);overflow:hidden}.bar-fill{display:block;height:100%;border-radius:inherit;background:var(--c-mastery)}.app-nav{display:flex;justify-content:space-around;margin:6px -4px 0;padding-top:10px;border-top:var(--border-w) solid var(--c-line)}.app-nav span{display:grid;place-items:center;width:52px;height:36px;border-radius:12px;color:var(--nav-tone)}.app-nav .is-active{background:color-mix(in srgb,var(--nav-tone) 14%,var(--c-surface))}.app-nav .icon{width:24px;height:24px}.tone-nav-0{--nav-tone: var(--nav-0)}.tone-nav-1{--nav-tone: var(--nav-1)}.tone-nav-2{--nav-tone: var(--nav-2)}.tone-nav-3{--nav-tone: var(--nav-3)}.hero-chips{position:absolute;inset:0;pointer-events:none}.float-chip{position:absolute;display:inline-flex;align-items:center;gap:6px;padding:10px 14px;border:var(--border-w) solid var(--c-line);border-radius:var(--radius-lg);background:var(--c-surface);color:var(--tone);box-shadow:0 var(--ledge) 0 var(--c-line-deep);font-size:15px;font-weight:900;white-space:nowrap;animation:pop var(--motion-pop) var(--ease-out) both}.float-chip .icon{width:22px;height:22px}.chip-xp{top:12%;left:2%;animation-delay:.5s}.chip-streak{top:44%;right:0;animation-delay:.7s}.chip-correct{bottom:9%;left:4%;color:var(--on-success);background:var(--c-success-container);border-color:color-mix(in srgb,var(--c-success) 40%,transparent);box-shadow:0 var(--ledge) 0 color-mix(in srgb,var(--c-success) 45%,transparent);animation-delay:.9s}.chip-correct .icon{color:var(--c-success)}@keyframes rise{0%{opacity:0;transform:translateY(28px)}}@keyframes pop{0%{opacity:0;transform:scale(.6) translateY(8px)}70%{transform:scale(1.06)}to{opacity:1;transform:none}}@media(max-width:600px){.hero-visual{padding-top:56px}.float-chip{padding:8px 10px;font-size:13px}.chip-xp{top:0;left:4%}.chip-streak{top:40%}.chip-correct{left:0;bottom:6%}}.highlights{border-block:var(--border-w) solid var(--c-line);background:var(--c-surface)}.highlight-list{display:grid;gap:4px 24px;padding-block:24px}.highlight-list li{display:flex;align-items:center;gap:14px;padding-block:8px;color:var(--c-ink-muted);font-size:var(--text-sm);line-height:1.4}.highlight-list b{display:block;color:var(--c-ink);font-size:var(--text-md)}@media(min-width:640px){.highlight-list{grid-template-columns:repeat(2,1fr)}}@media(min-width:1080px){.highlight-list{grid-template-columns:repeat(4,1fr);padding-block:28px}}.how-list{display:grid;gap:clamp(56px,3rem + 3vw,104px)}.how-row{display:grid;gap:32px;align-items:center}.how-copy{max-width:52ch}.how-copy p{margin-top:14px;color:var(--c-ink-muted)}.how-copy h3{font-size:clamp(1.45rem,1.2rem + 1vw,2rem)}.how-number{display:inline-block;margin-bottom:16px;padding:4px 12px;border-radius:var(--radius-sm);background:var(--c-primary-container);color:var(--c-primary);font-size:var(--text-sm);font-weight:900;font-variant-numeric:tabular-nums}.how-visual{display:grid;place-items:center;padding-top:18px}@media(min-width:900px){.how-row{grid-template-columns:repeat(2,minmax(0,1fr));gap:72px}.how-row.is-reverse .how-visual{order:-1}}.mock-card{position:relative;width:100%;max-width:380px;padding:22px;border:var(--border-w) solid var(--c-line);border-radius:24px;background:var(--c-surface);box-shadow:0 6px 0 var(--c-line-deep);color:var(--c-ink)}.mock-progress{display:flex;gap:4px;margin-bottom:18px}.mock-progress i{flex:1;height:8px;border-radius:var(--radius-pill);background:var(--c-line)}.mock-progress .is-done{background:var(--c-primary)}.mock-progress .is-right{background:var(--c-success)}.skeleton{display:block;height:10px;border-radius:6px;background:var(--c-line)}.mock-stem{display:grid;gap:9px;margin-bottom:20px}.mock-stem .skeleton{height:12px;background:color-mix(in srgb,var(--c-ink) 18%,var(--c-surface))}.mock-options{display:grid;gap:10px}.mock-options li{display:flex;align-items:center;gap:12px;min-height:48px;padding:10px 14px;border:var(--border-w) solid transparent;border-radius:var(--radius-md);background:var(--c-surface-muted)}.mock-options b{color:var(--c-ink-muted);font-size:14px}.mock-options .skeleton{flex:1;max-width:70%}.mock-options .is-correct{border-color:var(--c-success);background:var(--c-success-container)}.mock-options .is-correct b{color:var(--on-success)}.mock-options .is-correct .skeleton{background:color-mix(in srgb,var(--c-success) 35%,var(--c-success-container))}.option-check{width:24px;height:24px;margin-left:auto;color:var(--c-success)}.mock-xp{position:absolute;top:-18px;right:18px;padding:6px 12px;border-radius:var(--radius-md);background:var(--tone-soft);color:var(--tone-on);border:var(--border-w) solid color-mix(in srgb,var(--tone) 40%,transparent);font-size:15px;font-weight:900;animation:float-up 2.8s var(--ease-out) infinite}@keyframes float-up{0%,to{transform:translateY(0)}50%{transform:translateY(-6px)}}.mock-label{display:flex;align-items:center;gap:8px;margin-bottom:26px;color:var(--c-mastery);font-weight:900}.mock-label .icon{width:24px;height:24px}.mock-label span{color:var(--c-ink)}.timeline{position:relative;display:flex;justify-content:space-between}.timeline:before{content:"";position:absolute;top:8px;left:9px;right:9px;height:4px;border-radius:2px;background:var(--c-line)}.timeline li{position:relative;display:flex;flex-direction:column;align-items:center;gap:10px;color:var(--c-ink-muted);font-size:12px;font-weight:800;white-space:nowrap}.timeline i{width:20px;height:20px;border-radius:50%;border:3px solid var(--c-line-deep);background:var(--c-surface)}.timeline .is-done i{border-color:var(--c-mastery);background:var(--c-mastery)}.timeline .is-current i{border-color:var(--c-primary);box-shadow:0 0 0 5px var(--c-primary-container)}.timeline .is-current span{color:var(--c-primary);font-weight:900}.mock-exam-head{display:flex;justify-content:space-between;align-items:center;margin-bottom:14px;color:var(--c-ink-muted)}.mock-exam-head .icon{width:24px;height:24px}.mock-exam-title{font-size:1.3rem;font-weight:900}.mock-exam-meta{display:flex;flex-wrap:wrap;gap:6px 18px;margin:8px 0 20px;color:var(--c-ink-muted);font-size:14px;font-weight:800}.mock-exam-meta span{display:inline-flex;align-items:center;gap:6px}.mock-exam-meta .icon{width:18px;height:18px}.mock-exam .app-button{width:100%}.mock-session{display:flex;align-items:center;gap:20px}.session-mix{display:grid;gap:12px;flex:1}.session-mix li{display:flex;align-items:center;gap:10px;padding:10px 12px;border-radius:var(--radius-md);background:var(--tone-soft);color:var(--tone-on);font-size:14px;font-weight:900;line-height:1.25}.session-mix .icon{width:22px;height:22px;color:var(--tone)}@media(max-width:420px){.mock-session{flex-direction:column}.session-mix{width:100%}}.game-grid .feature-card{transition:transform var(--motion-fast) ease-out,box-shadow var(--motion-fast) ease-out}.game-grid .feature-card:hover{transform:translateY(-3px);box-shadow:0 var(--ledge) 0 var(--c-line-deep)}.rigor-grid{display:grid;gap:40px;align-items:start}.rigor-grid .section-heading{margin-bottom:0}.section-brand .check-icon{color:var(--brand-azure-light)}.section-brand .check-list div{color:color-mix(in srgb,var(--brand-plate) 82%,transparent)}.section-brand .check-list strong{color:var(--brand-plate)}@media(min-width:960px){.rigor-grid{grid-template-columns:minmax(0,.9fr) minmax(0,1.1fr);gap:72px}}.start-grid{display:grid;gap:40px;align-items:start}.start-grid .section-heading{margin-bottom:0}@media(min-width:960px){.start-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:72px}}.closing{padding-block:0 var(--section-space)}.section-muted+.closing{background:var(--c-surface-muted)}.closing-card{position:relative;overflow:hidden;display:grid;gap:8px;align-items:center;padding:clamp(28px,1.5rem + 3vw,64px);border-radius:32px;background:var(--brand-navy);color:var(--brand-plate);box-shadow:0 8px 0 var(--brand-navy-deep)}.closing-card h2{color:var(--brand-plate)}.closing-card p{margin-top:12px;max-width:46ch;color:color-mix(in srgb,var(--brand-plate) 80%,transparent);font-size:var(--text-lg)}.closing-card .actions{position:relative;z-index:1}.closing-card :focus-visible{outline-color:var(--brand-plate)}.closing-card .button:focus-visible{box-shadow:0 var(--ledge) 0 var(--button-ledge),0 0 0 3px var(--brand-navy),0 0 0 6px var(--brand-plate)}.closing-icons{position:absolute;right:-24px;bottom:-36px;display:flex;gap:4px;opacity:.1}.closing-icons .icon{width:120px;height:120px;color:var(--brand-plate)}@media(min-width:960px){.closing-card{grid-template-columns:1fr auto}.closing-card .actions{margin-top:0}}