:root{--ink:#14211c;--muted:#66736d;--paper:#f8f6ef;--white:#fff;--green:#16624d;--lime:#c9ed79;--line:#d9ddd6}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--paper);color:var(--ink);font-family:DM Sans,sans-serif}.shell{width:min(1160px,calc(100% - 48px));margin:auto}.nav{height:88px;display:flex;align-items:center;justify-content:space-between}.brand{font:800 21px Manrope;text-decoration:none;color:var(--ink);letter-spacing:-.5px}.brand span{display:inline-grid;place-items:center;width:40px;height:40px;margin-right:9px;border-radius:50%;background:var(--green);color:#fff;font-size:14px;letter-spacing:0}.nav nav{display:flex;gap:32px;align-items:center}.nav nav>a{color:var(--ink);text-decoration:none;font-weight:600;font-size:14px}.button{display:inline-flex;align-items:center;justify-content:center;background:var(--green);color:#fff!important;padding:15px 22px;border-radius:99px;text-decoration:none;font-weight:700}.button.small{padding:10px 17px}.hero{min-height:690px;padding:95px 0 90px;position:relative}.eyebrow,.section-no{font-size:12px;letter-spacing:2px;font-weight:700;color:var(--green)}.hero h1,.welcome h1{font:800 clamp(54px,7vw,92px)/.98 Manrope;margin:26px 0;letter-spacing:-5px;max-width:850px}.hero h1 em{color:var(--green);font-style:normal}.lede{font-size:19px;line-height:1.65;color:var(--muted);max-width:600px}.actions{display:flex;align-items:center;gap:28px;margin-top:36px}.text-link{color:var(--ink);font-weight:700;text-decoration:none}.text-link span{color:var(--green)}.equation-card{position:absolute;right:20px;bottom:68px;width:345px;background:#e7efdd;border:1px solid #d3ddc7;border-radius:24px;padding:24px;transform:rotate(-2deg);box-shadow:0 20px 60px #1232}.equation-card .label{font-size:10px;letter-spacing:2px;font-weight:800}.equation-card div{font:700 37px Manrope;margin:26px 0 12px}.equation-card p{margin:0;color:#536158;line-height:1.5}.band{background:var(--green);color:#fff;padding:100px 0}.split{display:grid;grid-template-columns:1fr 1fr;gap:100px;align-items:start}.split .section-no{color:var(--lime)}.split h2{font:700 46px/1.1 Manrope;letter-spacing:-2px}.split>p{font-size:19px;line-height:1.75;color:#e1eee9;margin-top:34px}.feature-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:1px;background:var(--line);margin-top:1px}.feature-grid article{background:var(--paper);padding:72px 42px}.feature-grid article>span{color:var(--green);font-weight:800;font-size:12px}.feature-grid h3{font:700 25px Manrope;margin-top:34px}.feature-grid p{color:var(--muted);line-height:1.65}footer{display:flex;justify-content:space-between;border-top:1px solid var(--line);padding:32px 0 48px;font-weight:700}footer small{font-weight:500;color:var(--muted)}.app-page{background:#f3f4ef}.app-nav{height:76px;background:#fff;border-bottom:1px solid var(--line);display:flex;align-items:center;padding:0 28px;gap:30px}.preview-pill{margin:auto;font-size:12px;font-weight:700;background:#eff5e7;padding:8px 12px;border-radius:99px;color:#4a6559}.preview-pill i{display:inline-block;width:7px;height:7px;border-radius:50%;background:#6daa49;margin-right:7px}.avatar{border:0;background:#e6eee9;color:var(--green);height:38px;width:38px;border-radius:50%;font-weight:800}.app-layout{min-height:calc(100vh - 76px);display:grid;grid-template-columns:255px 1fr}.app-layout aside{background:#fff;border-right:1px solid var(--line);padding:24px 18px;display:flex;flex-direction:column}.new-chat{border:0;border-radius:12px;background:var(--green);color:#fff;padding:13px;font-weight:700}.side-nav{display:grid;gap:7px;margin-top:28px}.side-nav a{padding:12px 14px;border-radius:10px;text-decoration:none;color:#506059;font-size:14px;font-weight:600}.side-nav a.active{background:#edf2e8;color:var(--green)}.mode-card{margin-top:auto;background:#f4f6f0;border:1px solid #e1e5dd;border-radius:14px;padding:16px;display:grid;gap:7px}.mode-card span{font-size:9px;letter-spacing:1.4px;font-weight:800;color:var(--muted)}.mode-card button{border:0;background:none;text-align:left;padding:0;color:var(--green);font-weight:700}.workspace{display:flex;flex-direction:column;align-items:center;padding:12vh 30px 30px}.welcome{text-align:center}.welcome h1{font-size:44px;letter-spacing:-2px;margin:15px 0}.welcome p{color:var(--muted)}.topic-row{display:flex;gap:9px;margin:26px 0}.topic-row button{border:1px solid var(--line);border-radius:99px;background:#fff;padding:10px 14px;color:#536158}.composer{background:#fff;border:1px solid #cfd7cf;border-radius:20px;padding:13px;width:min(760px,100%);box-shadow:0 16px 40px #19372712}.composer textarea{width:100%;resize:none;border:0;outline:0;padding:10px;font:16px DM Sans}.composer>div{display:flex;align-items:center;gap:10px;color:#849089;font-size:12px}.composer button{border:0}.attach{width:34px;height:34px;border-radius:50%;background:#eef1eb;font-size:18px}.send{margin-left:auto;border-radius:99px!important;background:var(--green);color:#fff;padding:10px 16px;font-weight:700}.status{color:#7a867f;font-size:12px;margin-top:14px}@media(max-width:800px){.nav nav>a:not(.button){display:none}.hero{padding-top:65px}.hero h1{font-size:54px;letter-spacing:-3px}.equation-card{position:relative;right:auto;bottom:auto;margin:70px 0 0;width:100%;transform:none}.split{grid-template-columns:1fr;gap:20px}.feature-grid,.app-layout{grid-template-columns:1fr}.app-layout aside{display:none}.workspace{padding:10vh 18px}.topic-row{flex-wrap:wrap;justify-content:center}footer{gap:16px;flex-direction:column}}.actions{gap:18px;flex-wrap:wrap}.install-trigger{border:1px solid #b7c5bd;background:transparent;color:var(--green)!important;font:700 15px DM Sans,sans-serif;cursor:pointer}.install-trigger span{font-size:18px;line-height:0}.install-trigger:hover{background:#eaf0e8}.install-trigger[hidden],.install-dialog[hidden]{display:none}.install-dialog{position:fixed;inset:0;z-index:1000;display:grid;place-items:center;padding:22px}.install-backdrop{position:absolute;inset:0;border:0;background:#07140ed9;-webkit-backdrop-filter:blur(7px);backdrop-filter:blur(7px);cursor:default}.install-sheet{position:relative;width:min(500px,100%);max-height:calc(100vh - 44px);overflow:auto;border:1px solid #d8ddcf;border-radius:26px;background:var(--paper);padding:34px;box-shadow:0 30px 100px #0007}.install-sheet>img{display:block;border-radius:18px;margin-bottom:20px;box-shadow:0 10px 28px #102a1d2e}.install-sheet h2{font:800 32px/1.08 Manrope;margin:9px 42px 12px 0;letter-spacing:-1.4px}.install-sheet>p{margin:0;color:var(--muted);font-size:16px;line-height:1.55}.install-sheet ol{display:grid;gap:11px;margin:24px 0;padding:0;counter-reset:install-step;list-style:none}.install-sheet li{position:relative;min-height:48px;padding:13px 14px 13px 56px;border:1px solid var(--line);border-radius:14px;background:#fff;line-height:1.45;color:#405049}.install-sheet li:before{counter-increment:install-step;content:counter(install-step);position:absolute;left:14px;top:11px;width:28px;height:28px;display:grid;place-items:center;border-radius:50%;background:var(--green);color:#fff;font-weight:800}.install-close{position:absolute;right:22px;top:22px;width:38px;height:38px;border:1px solid var(--line);border-radius:50%;background:#fff;color:var(--ink);font-size:24px;line-height:1;cursor:pointer}.install-sheet-actions{display:flex;align-items:center;gap:22px}.install-done{border:0;font:700 15px DM Sans,sans-serif;cursor:pointer}.install-dialog-open{overflow:hidden}@media(max-width:800px){.actions{align-items:stretch}.actions .button{flex:1 1 210px}.actions .text-link{width:100%;margin-top:6px}.install-dialog{align-items:end;padding:0}.install-sheet{width:100%;max-height:90vh;border-radius:24px 24px 0 0;padding:28px 22px calc(24px + env(safe-area-inset-bottom))}.install-sheet h2{font-size:28px}.install-sheet-actions{justify-content:space-between}}