.dhp{--ink:#0c3a2c;--ink-soft:#3d5c4e;--paper:#f5f6ec;--board:#0b352a;--chalk:#f3f6ea;--leaf:#1e8a4f;--leaf-deep:#0f5132;--mint:#dff0d8;--marigold:#ffc53d;--coral:#ff6b4a;--tangerine:#f6a02b;--lilac:#c2a8f4;--shadow:6px 6px 0 var(--ink)}.dhp *,.dhp :before,.dhp :after{box-sizing:border-box;margin:0;padding:0}html:has(.dhp){scroll-behavior:smooth;scroll-padding-top:96px}.dhp{font-family:var(--font-figtree),system-ui,sans-serif;background-color:var(--paper);color:var(--ink);background-image:linear-gradient(#0c3a2c0e 1px,#0000 1px),linear-gradient(90deg,#0c3a2c0e 1px,#0000 1px);background-size:34px 34px;min-height:100vh;line-height:1.6;overflow-x:hidden}.dhp img{max-width:100%;display:block}.dhp a{color:inherit}.dhp ::selection{background:var(--marigold);color:var(--ink)}.dhp :focus-visible{outline:3px solid var(--coral);outline-offset:3px;border-radius:8px}.dhp .wrap{max-width:1180px;margin:0 auto;padding:0 24px}.dhp .center{text-align:center}.dhp .center .eyebrow{justify-content:center}.dhp .eyebrow{font-family:var(--font-spline-mono),monospace;letter-spacing:.18em;text-transform:uppercase;color:var(--leaf-deep);align-items:center;gap:10px;font-size:.76rem;font-weight:600;display:inline-flex}.dhp .eyebrow:before{content:"✶";color:var(--coral)}.dhp .h2{font-family:var(--font-baloo),sans-serif;letter-spacing:-.01em;margin:14px 0 16px;font-size:clamp(2.05rem,4.4vw,3.15rem);font-weight:800;line-height:1.12}.dhp .lede{color:var(--ink-soft);max-width:56ch;font-size:1.12rem}.dhp .center .lede{margin-left:auto;margin-right:auto}.dhp .ur{font-family:var(--font-nastaliq),serif}.dhp .btn{font-family:var(--font-baloo),sans-serif;border:2px solid var(--ink);color:var(--ink);cursor:pointer;box-shadow:4px 4px 0 var(--ink);background:#fff;border-radius:999px;align-items:center;gap:8px;padding:13px 26px;font-size:1.02rem;font-weight:700;text-decoration:none;transition:transform .15s,box-shadow .15s,background .15s;display:inline-flex}.dhp 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.logo{font-family:var(--font-baloo),sans-serif;letter-spacing:-.01em;align-items:center;gap:11px;font-size:1.35rem;font-weight:800;text-decoration:none;display:flex}.dhp .logo-mark{object-fit:contain;flex:none;width:40px;height:40px;display:block}.dhp .nav-links{align-items:center;gap:26px;margin-left:auto;display:flex}.dhp .nav-links a{font-size:.97rem;font-weight:600;text-decoration:none;position:relative}.dhp .nav-links a:hover{color:var(--leaf-deep)}.dhp .nav-links a:after{content:"";background:var(--marigold);border-radius:3px;height:3px;transition:right .2s;position:absolute;bottom:-4px;left:0;right:100%}.dhp .nav-links a:hover:after{right:0}.dhp .nav-actions{align-items:center;display:flex}.dhp .nav .btn{margin-left:8px}.dhp .hero{padding:168px 24px 96px}.dhp .hero-inner{grid-template-columns:1.04fr .96fr;align-items:center;gap:60px;max-width:1180px;margin:0 auto;display:grid}.dhp .hero h1{font-family:var(--font-baloo),sans-serif;letter-spacing:-.015em;margin:18px 0 20px;font-size:clamp(2.9rem,5.7vw,4.7rem);font-weight:800;line-height:1.04}.dhp .hl{background:var(--marigold);border:2px solid var(--ink);box-shadow:5px 5px 0 var(--ink);border-radius:.22em;padding:.02em .2em .06em;display:inline-block;transform:rotate(-1.4deg)}.dhp .hero .lede{margin-bottom:30px}.dhp .cta-row{flex-wrap:wrap;align-items:center;gap:14px;display:flex}.dhp .chiprow{flex-wrap:wrap;gap:10px;margin-top:26px;display:flex}.dhp .invite-link{color:var(--leaf-deep);border-bottom:2px solid var(--marigold);margin-top:20px;font-size:.93rem;font-weight:600;text-decoration:none;display:inline-block}.dhp .invite-link:hover{color:var(--ink)}@keyframes dhpRise{0%{opacity:0;transform:translateY(26px)}to{opacity:1;transform:none}}.dhp .rise{animation:.75s cubic-bezier(.22,.9,.3,1) both dhpRise}.dhp .r1{animation-delay:50ms}.dhp .r2{animation-delay:.15s}.dhp .r3{animation-delay:.25s}.dhp .r4{animation-delay:.35s}.dhp .r5{animation-delay:.45s}.dhp .demo-wrap{position:relative}@keyframes 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.live{font-family:var(--font-spline-mono),monospace;letter-spacing:.12em;background:var(--marigold);border:2px solid var(--ink);border-radius:999px;align-items:center;gap:7px;margin-left:auto;padding:5px 11px;font-size:.66rem;font-weight:600;display:inline-flex}.dhp .live i{background:var(--coral);border-radius:50%;width:7px;height:7px;animation:1.4s infinite dhpPulse}@keyframes dhpPulse{50%{opacity:.35;transform:scale(.75)}}.dhp .demo-log{background:repeating-linear-gradient(#0000 0 31px,#0c3a2c12 31px 32px);flex-direction:column;gap:10px;height:330px;padding:18px;display:flex;overflow-y:auto}.dhp .msg{border:2px solid var(--ink);border-radius:16px;max-width:86%;padding:10px 14px;font-size:.95rem;line-height:1.45;animation:.35s both dhpMsgIn}@keyframes dhpMsgIn{0%{opacity:0;transform:translateY(8px)scale(.97)}}.dhp .msg.tutor{background:var(--paper);border-bottom-left-radius:4px;align-self:flex-start}.dhp .msg.user{background:var(--leaf);color:#fff;font-weight:700;font-family:var(--font-baloo),sans-serif;border-bottom-right-radius:4px;align-self:flex-end}.dhp .msg.typing{align-items:center;gap:5px;min-height:40px;display:flex}.dhp .msg.typing span{background:var(--ink-soft);opacity:.45;border-radius:50%;width:7px;height:7px;animation:1s infinite dhpBlink}.dhp .msg.typing span:nth-child(2){animation-delay:.15s}.dhp .msg.typing span:nth-child(3){animation-delay:.3s}@keyframes dhpBlink{50%{opacity:1;transform:translateY(-3px)}}.dhp .demo-options{border-top:2px solid var(--ink);background:#fff;flex-wrap:wrap;gap:10px;min-height:74px;padding:14px 18px;display:flex}.dhp .opt{min-width:80px;font-family:var(--font-baloo),sans-serif;border:2px solid var(--ink);background:var(--paper);color:var(--ink);cursor:pointer;box-shadow:3px 3px 0 var(--ink);text-align:center;border-radius:14px;flex:1;justify-content:center;align-items:center;padding:10px 12px;font-size:1.12rem;font-weight:700;text-decoration:none;transition:transform .15s,box-shadow .15s,background .15s;display:inline-flex}.dhp .opt:hover:not(:disabled){box-shadow:5px 5px 0 var(--ink);background:var(--marigold);transform:translate(-2px,-2px)}.dhp .opt:disabled{cursor:default}.dhp .opt.wrong{border-color:var(--coral);color:var(--coral);opacity:.55;box-shadow:none;background:#fff;animation:.45s dhpShake}.dhp .opt.right{background:var(--leaf);color:#fff}.dhp .opt.opt-cta{background:var(--leaf);color:#fff;flex:1.7}@keyframes dhpShake{20%,60%{transform:translate(-5px)}40%,80%{transform:translate(5px)}}.dhp .demo-foot{border-top:2px solid var(--ink);background:var(--mint);border-radius:0 0 21px 21px;justify-content:space-between;align-items:center;gap:12px;padding:11px 18px;font-size:.8rem;font-weight:700;display:flex}.dhp .streak{align-items:center;gap:6px;display:inline-flex}.dhp .streak.pop{animation:.45s dhpPop}@keyframes dhpPop{40%{transform:scale(1.3)rotate(-4deg)}}.dhp .demo-foot .hint{color:var(--ink-soft);font-style:italic;font-weight:600}.dhp .confetti-layer{pointer-events:none;z-index:5;border-radius:24px;position:absolute;inset:0;overflow:hidden}.dhp .confetti{border:1.5px solid var(--ink);border-radius:3px;width:9px;height:13px;animation:linear both dhpFall;position:absolute;top:-14px}@keyframes dhpFall{to{transform:translateY(580px)rotate(440deg)}}.dhp .float-sticker{border:2px solid var(--ink);width:58px;height:58px;box-shadow:4px 4px 0 var(--ink);z-index:6;background:#fff;border-radius:16px;place-items:center;font-size:1.65rem;display:grid;position:absolute}.dhp .fs1{background:var(--marigold);animation:5.5s ease-in-out infinite dhpFloat1;top:-26px;left:-24px}.dhp .fs2{background:var(--lilac);animation:6.5s ease-in-out infinite dhpFloat2;bottom:-34px;right:-30px}.dhp .fs3{background:#fff;animation:6s ease-in-out infinite dhpFloat3;top:42%;right:-32px}@keyframes 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.demo-try-cta>span{font-family:var(--font-baloo),sans-serif;color:#fff;background:var(--leaf);border:2.5px solid var(--ink);box-shadow:5px 5px 0 var(--ink);border-radius:999px;align-items:center;gap:10px;padding:16px 34px;font-size:1.55rem;font-weight:800;transition:transform .15s;display:inline-flex;transform:rotate(1.3deg)}.dhp .demo-try-cta:hover{background:#12281642}.dhp .demo-try-cta:hover>span{transform:rotate(1.3deg)scale(1.05)}.dhp .frac-demo-head{border-bottom:2px solid var(--ink);background:var(--mint);align-items:center;gap:12px;padding:15px 18px;display:flex}.dhp .frac-demo-mark{object-fit:contain;border:2px solid var(--ink);background:#fff;border-radius:12px;flex:none;width:40px;height:40px;padding:5px}.dhp .frac-demo-head strong{font-family:var(--font-baloo),sans-serif;font-size:1.05rem;font-weight:800;line-height:1.2;display:block}.dhp .frac-demo-head small{color:var(--ink-soft);font-size:.78rem;font-weight:600}.dhp .frac-demo-live{font-family:var(--font-spline-mono),monospace;letter-spacing:.12em;background:var(--marigold);border:2px solid var(--ink);border-radius:999px;align-items:center;gap:7px;margin-left:auto;padding:5px 11px;font-size:.66rem;font-weight:600;display:inline-flex}.dhp .frac-demo-live i{background:var(--coral);border-radius:50%;width:7px;height:7px;animation:1.4s infinite dhpPulse}.dhp .frac-demo-prompt{align-items:center;gap:6px;height:64px;padding:6px 14px;display:flex}.dhp .frac-demo-prompt-text{min-width:0;color:var(--ink);text-align:center;text-wrap:balance;flex:1;font-size:1rem;font-weight:500;line-height:1.35}.dhp .frac-demo-prompt-text b{color:var(--leaf-deep)}.dhp .frac-sentence{display:block}.dhp .frac-prompt-hint{color:var(--coral);font-weight:700}.dhp .frac-demo-stage{background:linear-gradient(178deg,#fffdf4,#fdf6e3 70%,#f6ecd3);flex-direction:column;justify-content:center;align-items:center;gap:12px;height:296px;padding:4px 20px 12px;display:flex}.dhp .frac-demo-arena{justify-content:center;align-items:center;width:100%;min-height:150px;display:flex;position:relative}.dhp .frac-demo-pizza{place-items:center;min-height:150px;display:grid}.dhp .frac-knife-rest{z-index:4;cursor:grab;position:absolute;top:-10px;right:3%}.dhp .frac-demo--knife,.dhp .frac-demo--knife *{cursor:none}.dhp .frac-demo-halves{justify-content:center;align-items:center;gap:10px;min-height:150px;display:flex}.dhp .frac-half{cursor:grab;touch-action:none;filter:drop-shadow(3px 4px #0000001f);line-height:0;transition:transform .2s}.dhp .frac-half:hover{transform:translateY(-3px)scale(1.03)}.dhp .frac-half:active{cursor:grabbing}.dhp .frac-reveal{min-height:150px;font-family:var(--font-baloo),sans-serif;color:var(--ink);justify-content:center;align-items:center;gap:14px;font-weight:800;animation:.5s dhpPop;display:flex}.dhp .frac-reveal-eq{color:var(--leaf-deep);opacity:0;align-items:center;gap:10px;font-size:1.5rem;transition:opacity .45s,transform 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.frac-chip{line-height:1;font-family:var(--font-baloo),sans-serif;color:var(--leaf-deep);flex-direction:column;align-items:center;font-size:.82rem;font-weight:800;animation:.45s dhpPop;display:inline-flex}.dhp .frac-chip i{background:currentColor;border-radius:2px;width:15px;height:2px;margin:2px 0;display:block}.dhp .frac-chip--lg{font-size:2rem}.dhp .frac-chip--lg i{width:34px;height:4px;margin:4px 0}.dhp .frac-demo-foot{border-top:2px solid var(--ink);background:var(--mint);justify-content:center;align-items:center;height:78px;padding:9px 14px;display:flex}.dhp .frac-wait{gap:6px;display:inline-flex}.dhp .frac-wait span{background:var(--ink-soft);opacity:.45;border-radius:50%;width:8px;height:8px;animation:1s infinite dhpBlink}.dhp .frac-wait span:nth-child(2){animation-delay:.15s}.dhp .frac-wait span:nth-child(3){animation-delay:.3s}.dhp .frac-back,.dhp .frac-prompt-spacer{flex:none;width:32px;height:32px}.dhp .frac-back{border:2px solid var(--ink);color:var(--ink);font-family:var(--font-baloo),sans-serif;cursor:pointer;box-shadow:2px 2px 0 var(--ink);background:#fff;border-radius:50%;place-items:center;font-size:1.1rem;font-weight:800;line-height:1;transition:transform .15s,box-shadow .15s,background .15s;display:grid}.dhp .frac-back:hover:not(:disabled){box-shadow:3px 3px 0 var(--ink);background:var(--marigold);transform:translate(-1px,-1px)}.dhp .frac-back:disabled{opacity:.3;cursor:default}.dhp .frac-demo-hint{color:var(--ink-soft);font-size:.82rem;font-style:italic;font-weight:600}.dhp .frac-demo-cta{flex-wrap:wrap;justify-content:center;gap:10px;display:flex}.dhp .frac-demo-choices{flex-direction:row;justify-content:center;align-items:stretch;gap:8px;width:100%;display:flex}.dhp .frac-choice{min-width:0;font-family:var(--font-baloo),sans-serif;border:2px solid var(--ink);background:var(--paper);color:var(--ink);cursor:pointer;box-shadow:3px 3px 0 var(--ink);text-align:center;border-radius:12px;flex:1;justify-content:center;align-items:center;padding:7px 8px;font-size:.82rem;font-weight:700;line-height:1.16;transition:transform .15s,box-shadow .15s,background .15s;display:flex}.dhp .frac-choice:hover{box-shadow:5px 5px 0 var(--ink);background:var(--marigold);transform:translate(-2px,-2px)}.dhp .frac-choice--wrong{border-color:var(--coral);color:var(--coral);background:#fff;animation:.45s dhpShake}.dhp .demo-spotlight-scrim{z-index:90;-webkit-backdrop-filter:blur(5px);overscroll-behavior:contain;background-color:#f5f6ecf5;background-image:linear-gradient(#0c3a2c0f 1px,#0000 1px),linear-gradient(90deg,#0c3a2c0f 1px,#0000 1px);background-size:34px 34px;animation:.2s ease-out both dhpScrimIn;position:fixed;inset:0;overflow-y:auto}.dhp .demo-spotlight-field{z-index:0;pointer-events:none;position:fixed;inset:0;overflow:hidden}.dhp .demo-spotlight-sym{font-family:var(--font-baloo),sans-serif;white-space:nowrap;transform:rotate(var(--r,0deg));animation:dhpSymFloat var(--d,6s) ease-in-out infinite;font-weight:800;line-height:1;position:absolute}@keyframes dhpSymFloat{0%,to{transform:translateY(0) rotate(var(--r,0deg))}50%{transform:translateY(-10px) rotate(var(--r,0deg))}}.dhp .demo-spotlight-inner{z-index:1;justify-content:center;align-items:center;min-height:100%;padding:40px 22px;display:flex;position:relative}.dhp .demo-spotlight-card{transform-origin:50%;width:min(460px,100%);animation:.26s cubic-bezier(.22,.9,.3,1) both dhpSpotIn;position:relative}.dhp .demo-spotlight-card .frac-demo{animation:none}.dhp .demo-spotlight-card--wide{width:fit-content;max-width:96vw}.dhp .demo-spotlight-card--wide .embedded-demo-frame{--embed-scale:max(.34, min(.92, calc((96vw - 24px) / 728), calc((100vh - 96px) / 700)));width:calc(728px * var(--embed-scale));height:calc(700px * var(--embed-scale));background:0 0;border:none;border-radius:20px;padding:0;overflow:hidden}.dhp .demo-spotlight-card--wide .embedded-demo-inner{border-radius:0;width:100%;height:100%;min-height:0;display:block}.dhp .demo-spotlight-card--wide .lesson-runner-embedded{transform:scale(var(--embed-scale)) translateX(-156px)}.dhp .demo-spotlight-scrim.is-closing{animation:.2s ease-in forwards dhpScrimOut}.dhp .demo-spotlight-card.is-closing{animation:.2s ease-in forwards dhpSpotOut}.dhp .demo-spotlight-close{z-index:2;border:2.5px solid var(--ink);width:44px;height:44px;color:var(--ink);cursor:pointer;box-shadow:4px 4px 0 var(--ink);background:#fff;border-radius:50%;place-items:center;font-size:16px;line-height:1;transition:transform .12s,box-shadow .12s,background .15s;display:grid;position:absolute;top:-16px;right:-16px}.dhp .demo-spotlight-close:hover{background:var(--marigold)}.dhp .demo-spotlight-close:active{box-shadow:0 0 0 0 var(--ink);transform:translate(3px,3px)}@keyframes 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