.hero{position:relative;overflow:hidden;padding-block:clamp(3rem,6vw,5rem) clamp(3.5rem,6vw,6rem);background:var(--surface)}.hero:before{content:"";position:absolute;background-image:url(./welcome-brush-corner-TZ5YP4tC.webp);background-size:contain;pointer-events:none;top:-9rem;right:-5rem;width:clamp(22rem,42vw,38rem);aspect-ratio:4 / 3;background-repeat:no-repeat;opacity:.18;transform:scaleY(-1)}.hero-inner{position:relative;display:grid;grid-template-columns:minmax(0,1.02fr) minmax(0,.98fr);align-items:center;gap:clamp(2rem,5vw,5rem)}.hero h1{font-size:clamp(2.6rem,1.4rem + 4.2vw,4.35rem);font-weight:820;letter-spacing:-.055em;line-height:1.08}.hero h1 span{display:block;color:var(--ink-2);text-wrap:balance}.hero-lead{max-width:34rem;margin-top:1.5rem;color:var(--text-muted);font-size:clamp(1.0625rem,.95rem + .5vw,1.25rem);line-height:1.6}.hero-actions{display:flex;flex-wrap:wrap;gap:.75rem;margin-top:2.25rem}.hero-classroom-link{margin-top:1.4rem}.hero-notes{display:flex;flex-wrap:wrap;gap:.65rem 1.2rem;margin-top:1.75rem;padding-top:1.5rem;border-top:1px solid var(--line)}.hero-notes li{display:inline-flex;align-items:center;gap:.5rem;color:var(--text-muted);font-size:.9375rem;font-weight:560}.hero-notes svg{width:1.15rem;height:1.15rem;padding:0;border-radius:50%;background:transparent;color:var(--accent-strong)}.hero-visual{position:relative;display:flex;align-items:center;justify-content:center;width:100%;min-height:650px;overflow:hidden;padding:1.5rem 0 2rem;isolation:isolate}.phone-shell{position:relative;width:min(340px,76%);aspect-ratio:.54;overflow:hidden;border:8px solid var(--ink);border-radius:48px;background:#fff;box-shadow:var(--shadow-lg);transform:translate(-10px)}.phone-camera{position:absolute;top:8px;left:50%;z-index:5;width:112px;height:24px;border-radius:999px;background:#080d16;transform:translate(-50%)}.phone-screen{position:absolute;inset:0;padding:46px 18px 22px;background:linear-gradient(180deg,#fbfcfe 0,#fff 34%,#f8fafc);color:#0b1730}.phone-topbar{display:flex;align-items:flex-start;justify-content:space-between;padding:0 1px 17px;border-bottom:1px solid #e7edf5}.phone-title{display:flex;flex-direction:column;gap:4px}.phone-eyebrow{color:#5d6e87;font-size:9px;font-weight:800;letter-spacing:.13em}.phone-title strong{font-size:12px;letter-spacing:-.02em}.phone-actions{display:flex;gap:14px;color:#334d6e}.phone-icon{width:16px;height:16px}.phone-label{margin:20px 0 10px;color:#5d6e87;font-size:9px;font-weight:800;letter-spacing:.13em;text-align:center}.phone-math-card{display:flex;align-items:center;justify-content:center;gap:13px;min-height:86px;border:1px solid #dce6f1;border-radius:18px;background:#f7f9fc;font-family:var(--font-math);font-size:20px}.phone-integral{display:block;flex:none;width:auto;height:48px;overflow:visible}.phone-expression .frac,.phone-equation .frac{font-size:max(.82em,9px)}.phone-graph-card{margin-top:12px;padding:13px;border:1px solid #dce5f0;border-radius:20px;background:#fff;box-shadow:0 8px 25px #16284212}.phone-graph-head{display:flex;align-items:flex-start;justify-content:space-between}.phone-graph-head>div{display:flex;flex-direction:column;gap:3px}.phone-graph-head strong{font-size:13px}.phone-graph-head span{color:#5d6e87;font-size:9px}.phone-graph-card .phone-equation{display:flex;justify-content:center;margin:12px 0 8px;padding:8px 10px;border:1px solid #e3e9f2;border-radius:12px;background:#f7f9fc;font-size:18px}.phone-graph{position:relative;height:170px;overflow:hidden;border:1px solid #e7edf4;border-radius:10px;background:linear-gradient(#e9eef5 1px,transparent 1px),linear-gradient(90deg,#e9eef5 1px,transparent 1px),#fbfcfe;background-size:28px 28px}.phone-graph svg{position:absolute;inset:0;width:100%;height:100%;color:#2e76dc}.phone-axis{position:absolute;z-index:1;display:block;background:#8090a4}.phone-axis-x{top:50%;right:0;left:0;height:1px}.phone-axis-y{top:0;bottom:0;left:50%;width:1px}.math-line{display:inline-flex;align-items:center;gap:.28em;font-family:var(--font-math);font-weight:500;white-space:nowrap}.math-line i{font-family:var(--font-math);font-style:italic}.frac{display:inline-flex;flex-direction:column;align-items:center;margin-inline:.1em;font-size:max(.72em,.75rem);line-height:1.05}.frac>span:first-child{padding:0 .2em .06em;border-bottom:1px solid currentColor}.frac>span:last-child{padding-top:.06em}.floating-progress{color:#0b1730;position:absolute;right:.75rem;bottom:32px;z-index:6;width:276px;padding:17px;border:1px solid #dce6f2;border-radius:24px;background:#fffffff2;box-shadow:0 24px 70px #132a4d1f;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px)}.floating-progress-head{display:flex;align-items:center;gap:10px}.floating-progress-head>div{display:flex;flex-direction:column;gap:2px}.floating-progress-head strong{color:#0b1730;font-size:13px}.floating-progress-head>div>span{color:#5d6e87;font-size:9px}.floating-icon{display:grid;flex:none;place-items:center;width:32px;height:32px;border-radius:12px;background:#edf4fc;color:#2a6dcc}.floating-icon svg{width:18px;height:18px}.progress-metrics{display:grid;grid-template-columns:1fr 1fr;gap:8px;margin-top:14px}.progress-metrics>div{padding:10px;border-radius:12px;background:#f5f8fc}.progress-metrics span,.progress-metrics strong{display:block;font-size:18px}.progress-metrics span{color:#5d6e87;font-size:9px}.progress-metrics strong{margin-top:4px;color:#0b1730;font-size:15px;font-variant-numeric:tabular-nums}.progress-bar{height:6px;margin-top:12px;overflow:hidden;border-radius:999px;background:#edf2f7}.progress-bar span{display:block;width:85.6%;height:100%;border-radius:inherit;background:linear-gradient(90deg,#2a6ed2,#67a1ed)}.floating-progress small{display:block;margin-top:9px;color:#5d6e87;font-size:9px;line-height:1.45}.capabilities{border-block:1px solid var(--line);background:var(--surface-raised)}.capability-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr))}.capability-grid li{display:flex;align-items:center;gap:.9rem;padding:1.4rem 1.25rem;border-left:1px solid var(--line)}.capability-grid li:first-child{padding-left:0;border-left:0}.capability-icon{display:grid;flex:none;place-items:center;width:2.5rem;height:2.5rem;border-radius:12px;background:var(--surface-alt);color:var(--accent-strong)}.capability-icon svg{width:1.3rem;height:1.3rem}.capability-text{display:grid;min-width:0}.capability-text strong{color:var(--ink);font-size:.9375rem;font-weight:700;letter-spacing:-.015em}.capability-text span{color:var(--text-muted);font-size:.875rem;line-height:1.4}.feature-list{display:grid;gap:clamp(4rem,8vw,7.5rem);margin-top:clamp(3rem,6vw,5rem)}.feature-row{display:grid;grid-template-columns:minmax(0,.9fr) minmax(0,1.1fr);align-items:center;gap:clamp(2rem,6vw,6rem)}.feature-row.reverse .feature-copy{order:2}.feature-tag{display:inline-flex;align-items:center;gap:.5rem;padding:.35rem .7rem;border:0;border-radius:999px;background:var(--accent-soft);color:var(--accent-strong);font-size:.8125rem;font-weight:700}.feature-tag svg{width:1.05rem;height:1.05rem}.feature-copy h3{margin-top:1.2rem;font-size:clamp(1.65rem,1.1rem + 1.7vw,2.4rem);font-weight:800;letter-spacing:-.038em;line-height:1.13}.feature-copy p{max-width:30rem;margin-top:1.1rem;color:var(--text-muted);font-size:var(--text-lg);line-height:1.65}.feature-stage{position:relative;display:grid;place-items:center;padding:calc(clamp(1rem,2.4vw,1.75rem) + 1px);overflow:hidden;background:transparent}.dot{display:inline-grid;place-items:center;width:1.1rem;height:1.1rem;margin-right:.2rem;border-radius:50%;color:#fff;font-size:var(--text-xs);font-style:normal;font-weight:700;line-height:1}.dot.good{background:var(--positive)}.dot.bad{background:var(--negative)}.dot.neutral{background:var(--neutral)}.free-section{position:relative;padding-block:var(--section-y);overflow:hidden;background:var(--surface-neutral);color:var(--ink);border-block:1px solid var(--line)}.free-layout{position:relative;display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1.1fr);align-items:center;gap:clamp(2rem,6vw,6rem)}.free-section h2{color:var(--ink);font-size:clamp(2.6rem,1.5rem + 4.2vw,4.75rem);font-weight:800;letter-spacing:-.045em}.free-copy p{color:var(--text-muted);font-size:var(--text-lg);line-height:1.7}.free-points{display:grid;gap:.9rem;margin-top:1.9rem}.free-points li{display:flex;align-items:flex-start;gap:.75rem;color:var(--ink-2);font-weight:560}.free-points svg{flex:none;width:1.4rem;height:1.4rem;margin-top:.1rem;padding:.25rem;border-radius:50%;background:var(--surface-raised);color:var(--accent-strong)}.promo-panel{position:relative;display:grid;grid-template-columns:minmax(0,1fr) auto;align-items:center;gap:2rem 3rem;padding:clamp(1.75rem,5vw,3.75rem);overflow:hidden;border-radius:var(--radius-2xl);background:var(--surface-dark);box-shadow:none;color:var(--on-dark);border:1px solid var(--line-dark)}.promo-copy .eyebrow{color:var(--accent-on-dark)}.promo-copy h2{max-width:30rem;color:var(--on-dark);font-size:clamp(1.8rem,1.2rem + 2.3vw,2.85rem);font-weight:780;letter-spacing:-.038em}.promo-copy p{max-width:36rem;margin-top:1.1rem;color:var(--on-dark-muted);font-size:var(--text-lg);line-height:1.65}.promo-actions{display:flex;flex-direction:column;gap:.75rem;min-width:14rem}.promo-panel .button-ghost-light{border-color:#fff6;background:transparent;color:var(--on-dark)}.promo-panel .button-ghost-light:hover{border-color:var(--on-dark-muted);background:#ffffff14}.promo-panel .button:focus-visible{outline-color:var(--accent-on-dark)}.download-section{padding-bottom:var(--section-y)}.download-panel{display:grid;grid-template-columns:auto minmax(0,1fr) auto;align-items:center;gap:2rem;padding:clamp(1.75rem,4vw,3rem);border:1px solid var(--accent-line);border-radius:var(--radius-2xl);background:var(--surface-raised);box-shadow:var(--shadow-sm)}.download-mark .brand-mark{width:4.5rem;height:4.5rem;border-radius:1.25rem;border:0}.download-mark .brand-mark svg{height:2.6rem}.download-copy .eyebrow{margin-bottom:.8rem}.download-copy h2{font-size:clamp(1.75rem,1.2rem + 2vw,2.6rem);font-weight:780;letter-spacing:-.04em}.download-copy p{margin-top:.6rem;color:var(--text-muted);font-size:var(--text-lg)}.download-actions{display:flex;flex-wrap:wrap;gap:.75rem}@media(max-width:68.75rem){.hero-visual{min-height:570px}.floating-progress{right:.5rem;width:245px}}@media(max-width:64rem){.hero-inner{grid-template-columns:minmax(0,1fr)}.hero-copy{max-width:40rem}.hero-visual{min-height:min(620px,92vw)}.phone-shell{width:min(360px,86%);transform:none}.floating-progress{right:max(4px,2%);bottom:45px;width:min(245px,72%)}.feature-row,.free-layout{grid-template-columns:minmax(0,1fr)}.feature-row.reverse .feature-copy{order:0}.feature-copy p{max-width:38rem}.capability-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.capability-grid li:nth-child(odd){padding-left:0;border-left:0}.capability-grid li:nth-child(n+3){border-top:1px solid var(--line)}.promo-panel{grid-template-columns:minmax(0,1fr)}.promo-actions{flex-direction:row;flex-wrap:wrap}.download-panel{grid-template-columns:auto minmax(0,1fr)}.download-actions{grid-column:1 / -1}.download-actions .download-chooser--end .download-chooser-panel{right:auto;left:0}}@media(max-width:40rem){.hero-actions{flex-direction:column}.hero-actions .download-chooser,.hero-actions .button{width:100%}.capability-grid{grid-template-columns:minmax(0,1fr)}.capability-grid li{padding-left:0;border-left:0}.capability-grid li:nth-child(n+2){border-top:1px solid var(--line)}.promo-actions{flex-direction:column}.download-panel{grid-template-columns:minmax(0,1fr);gap:1.5rem}.download-actions{flex-direction:column}.download-actions .download-chooser,.download-actions .button{width:100%}.download-actions .download-chooser--end .download-chooser-panel{right:auto;left:-1.75rem}}@media(max-width:37.5rem){.hero-visual{display:flex;flex-direction:column;align-items:stretch;min-height:0;margin-top:2px;padding:0;overflow:visible}.phone-camera{top:50%;left:9px;width:7px;height:7px;border-radius:50%;background:#141b28;box-shadow:inset 0 0 0 1.5px #070b12,0 0 0 2px #ffffff59;transform:translateY(-50%)}.phone-shell{width:100%;aspect-ratio:19.5 / 9;border-width:4px;border-radius:22px;background:var(--ink);box-shadow:var(--shadow-md);transform:none}.phone-screen{inset:1px;display:grid;grid-template-columns:minmax(0,.92fr) minmax(0,1.08fr);grid-template-rows:auto minmax(0,1fr);align-items:stretch;gap:8px;padding:8px 8px 8px 20px;border-radius:18px}.phone-topbar{grid-column:1 / -1;padding-bottom:0;border-bottom:0}.phone-title strong{font-size:13px}.phone-label{display:none}.phone-math-card{height:100%;min-height:0;gap:8px;padding:0 8px;border-radius:12px;font-size:15px}.phone-integral{height:27px}.phone-graph-head,.phone-graph-card .phone-equation{display:none}.phone-graph-card{height:100%;min-height:0;margin-top:0;padding:6px;border-radius:12px;box-shadow:none}.phone-graph{height:100%;min-height:0}.floating-progress{position:relative;right:auto;bottom:auto;width:100%;margin:14px 0 0;padding:14px 16px;border-radius:16px}.floating-progress small{display:none}}@media(max-width:24.375rem){.phone-shell{border-radius:16px}.phone-screen{gap:6px;padding:7px 7px 7px 18px;border-radius:12px}.phone-math-card{font-size:13px}.phone-integral{height:23px}}@font-face{font-family:KaTeX_Main;src:url(./katex-main-regular-B22Nviop.woff2) format("woff2");font-style:normal;font-weight:400;font-display:swap}@font-face{font-family:KaTeX_Math;src:url(./katex-math-italic-t53AETM-.woff2) format("woff2");font-style:italic;font-weight:400;font-display:swap}@font-face{font-family:KaTeX_Size2;src:url(./katex-size2-regular-Dy4dx90m.woff2) format("woff2");font-style:normal;font-weight:400;font-display:swap}.app-screen{--a-ink: var(--ink);--a-2: var(--text-muted);--a-3: var(--text-subtle);--a-line: var(--line);--a-subtle: var(--surface-alt);--a-sunken: var(--surface-sunken);--a-sans: ui-sans-serif, system-ui, sans-serif;--a-math: "KaTeX_Main", var(--font-math), "Times New Roman", serif;--a-math-i: "KaTeX_Math", var(--font-math), "Times New Roman", serif;position:relative;width:411px;margin-inline:auto;zoom:var(--app-zoom, 1);overflow:hidden;border-radius:28px;background:var(--surface);box-shadow:0 0 0 1px var(--a-line),var(--shadow-md);color:var(--a-ink);font-family:var(--a-sans);font-size:16px;line-height:1.5;text-align:left}.app-screen *,.app-screen *:before,.app-screen *:after{box-sizing:border-box}.app-screen-inner{display:flex;flex-direction:column}.app-svg{display:block;flex:none}.app-i{font-family:var(--a-math-i);font-style:italic;font-weight:400}.app-r{font-family:var(--a-math);font-style:normal;font-weight:400}.app-op{margin-inline:.2222em;font-family:var(--a-math)}.app-fn{margin-right:.1667em}.app-frac{display:inline-flex;flex-direction:column;align-items:center;margin-inline:.06em .12em;font-family:var(--a-math);line-height:1.15;vertical-align:middle}.app-frac>span:first-child{padding:0 .1em .04em;border-bottom:.04em solid currentColor}.app-frac>span:last-child{padding-top:.04em}.app-keypad .app-i,.app-keypad .app-r,.app-instruction .app-i{font-size:1.21em}.app-box{display:inline-block;width:.62em;height:.62em;margin-inline:.1em;border:1.5px solid currentColor;border-radius:2px;vertical-align:-.04em;opacity:.8}.app-header-row{display:flex;align-items:center;justify-content:space-between;gap:8px;min-height:60px;padding:8px 12px}.app-title{min-width:0}.app-eyebrow{display:block;margin-bottom:4px;color:var(--a-3);font-size:10px;font-weight:700;letter-spacing:1px;line-height:1;text-transform:uppercase}.app-step{display:block;color:var(--a-ink);font-size:14px;font-weight:600;line-height:1.4;white-space:nowrap}.app-step b{font-weight:600}.app-step span{color:var(--a-3);font-weight:400}.app-icons{display:flex;flex:none;gap:4px}.app-iconbtn{display:inline-flex;align-items:center;justify-content:center;width:44px;height:44px;border:1px solid var(--a-line);border-radius:12px;background:var(--surface-raised);color:var(--a-2)}.app-iconbtn.is-active{border-color:var(--accent-line);background:var(--accent-soft);color:var(--accent-strong)}.app-progress{height:4px;background:var(--a-sunken)}.app-progress span{display:block;width:20%;height:100%;background:var(--accent)}.app-guided-main{padding:20px 16px 14px}.app-equation{font-family:var(--a-math);font-size:29.77px;line-height:1.2;text-align:center;white-space:nowrap}.app-strut{display:inline-block;height:2.22em;vertical-align:-.86em}.app-int{position:relative;top:-.0011em;margin-right:.44445em;font-family:"KaTeX_Size2",var(--a-math)}.app-sup{position:relative;top:-.44em;margin-left:.04em;color:var(--accent);line-height:0;vertical-align:baseline}.app-sup>span{font-size:max(.7em,9px)}.app-thin{display:inline-block;width:.1667em}.app-instruction{margin-top:14px;padding:16px;border:1px solid var(--a-line);border-radius:16px;background:var(--a-subtle);color:var(--ink-2);font-size:16px;font-weight:500;line-height:24px;text-align:center}.app-answer{height:120px;margin:12px 8px 0;padding:16px 12px;border:1px solid var(--a-line);border-radius:16px;background:var(--surface-raised);color:var(--a-3);font-size:20px;line-height:1.4}.app-keyboard{border-top:1px solid var(--a-line);background:var(--surface-raised)}.app-keyboard-handle{position:relative;display:flex;align-items:center;justify-content:center;height:44px}.app-keyboard-calc{position:absolute;top:0;left:8px;display:inline-flex;align-items:center;justify-content:center;width:44px;height:44px;border-radius:8px;color:var(--a-2)}.app-grabber{width:40px;height:4px;border-radius:999px;background:var(--line-strong)}.app-toolbar{display:flex;align-items:center;justify-content:space-between;gap:4px;padding:4px 8px 8px}.app-toolbar-group{display:flex;flex:0 1 auto;gap:2px;min-width:0}.app-toolbtn{display:inline-flex;flex:0 1 44px;align-items:center;justify-content:center;min-width:0;width:44px;height:44px;border:1px solid transparent;border-radius:8px;color:var(--a-2);font-size:18px;line-height:1}.app-toolbtn.is-disabled{opacity:.3}.app-ac{color:var(--a-ink);font-size:11px;font-weight:700;letter-spacing:.02em}.app-segmented{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:4px;padding:4px;border-radius:14px;background:var(--a-sunken);box-shadow:inset 0 0 0 1px var(--a-line)}.app-segmented span{display:flex;align-items:center;justify-content:center;min-width:0;height:36px;border-radius:10px;color:var(--a-3);font-size:12px;font-weight:700;white-space:nowrap}.app-segmented .is-active{background:var(--accent-soft);box-shadow:0 0 0 1px var(--accent-line);color:var(--accent-strong)}.app-tabs{flex:0 1 132px;min-width:0;width:132px;height:44px}.app-keypad{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:6px;padding:0 8px 8px}.app-key{position:relative;display:flex;align-items:center;justify-content:center;height:44px;border:1px solid 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