:root{color:#052e09;--ink:#052e09;--green:#052e09;--leaf:#124d18;--mint:#daf1df;--mint-50:#edf4ee;--mint-edge:#9bc9a4;--yellow:#e0eb79;--yellow-edge:#c6d35a;--ink-edge:#021a04;--line:#dbe4dd;--line-strong:#c9d6cc;--page:#f5f8f6;--muted:#45614a;--danger:#a32317;--radius:16px;--gutter:20px;--guided-ink:var(--ink);--guided-green:var(--leaf);--guided-mint:var(--mint);--guided-mint-50:var(--mint-50);--guided-cta:var(--yellow);--guided-cta-edge:var(--yellow-edge);--guided-line:var(--line);--guided-line-strong:var(--line-strong);--guided-page:var(--page);--guided-danger:var(--danger);--guided-radius:var(--radius);--guided-gutter:var(--gutter);background:#f5f8f6;font-family:Inter,system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif;font-size:16px}*{box-sizing:border-box}html,body{height:100%}body{margin:0}#app{flex-direction:column;height:100vh;display:flex}@supports (height:100dvh){#app{height:100dvh}}button,input,textarea,select{font:inherit}button,a{-webkit-tap-highlight-color:transparent}button,a,input,textarea,select{touch-action:manipulation}button{cursor:pointer}button:disabled{opacity:.5;cursor:default}a{color:inherit}button:focus-visible{outline:2px solid var(--leaf);outline-offset:3px}a:focus-visible{outline:2px solid var(--leaf);outline-offset:3px}input:focus-visible{outline:2px solid var(--leaf);outline-offset:3px}textarea:focus-visible{outline:2px solid var(--leaf);outline-offset:3px}select:focus-visible{outline:2px solid var(--leaf);outline-offset:3px}h1,h2,h3,p{margin:0}h1{letter-spacing:-.02em;font-size:24px;font-weight:800;line-height:1.2}h2{font-size:17px;font-weight:800;line-height:1.3}h3{font-size:1rem}p{line-height:1.5}small,.fine{color:var(--muted);font-size:13px;line-height:1.45}small{display:block}.eyebrow{letter-spacing:.12em;text-transform:uppercase;color:var(--muted);font-size:12px;font-weight:750}.sr-only{clip:rect(0, 0, 0, 0);white-space:nowrap;width:1px;height:1px;margin:-1px;position:absolute;overflow:hidden}.guided-cta{border-radius:var(--radius);background:var(--yellow);width:100%;min-height:56px;color:var(--ink);box-shadow:0 4px 0 var(--yellow-edge);letter-spacing:.08em;text-transform:uppercase;text-align:center;border:0;justify-content:center;align-items:center;padding:15px 18px;font-size:14.5px;font-weight:800;text-decoration:none;transition:transform 80ms,box-shadow 80ms,background .12s;display:inline-flex}.guided-cta:hover{background:#dcea6e}.guided-cta:active{box-shadow:0 0 0 var(--yellow-edge);transform:translateY(4px)}.guided-cta:disabled{opacity:1;background:var(--line);color:#052e0966;box-shadow:none;transform:none}.guided-cta.secondary{color:var(--leaf);border:2px solid var(--line);box-shadow:0 4px 0 var(--line);background:#fff;padding:13px 18px}.guided-cta.secondary:hover{background:var(--mint-50)}.guided-cta.secondary:active{box-shadow:0 0 0 var(--line)}.guided-cta.ink{background:var(--ink);color:var(--yellow);box-shadow:0 4px 0 var(--ink-edge)}.guided-cta.ink:hover{background:#0a3d0f}.guided-cta.small{min-height:48px;padding:11px 16px}.guided-cta.secondary.small{padding:9px 16px}.guided-link{min-height:44px;color:var(--leaf);background:0 0;border:0;justify-content:center;align-items:center;padding:8px 10px;font-size:15px;font-weight:700;text-decoration:none;display:inline-flex}.chip{border:2px solid var(--line);min-height:40px;color:var(--leaf);background:#fff;border-radius:999px;justify-content:center;align-items:center;padding:8px 14px;font-size:14px;font-weight:700;line-height:1.3;text-decoration:none;display:inline-flex}.chip:hover{background:var(--mint-50)}.chip.on,.chip[aria-pressed=true]{background:var(--mint);border-color:var(--leaf)}.chip.ink{background:var(--leaf);border-color:var(--leaf);color:#fff}.icon-button{border:2px solid var(--line);width:44px;height:44px;color:var(--leaf);background:#fff;border-radius:12px;flex:none;justify-content:center;align-items:center;display:inline-flex}.icon-button:hover{background:var(--mint-50)}.icon-button.round{border-radius:50%;width:46px;height:46px}.icon-button.ink{background:var(--ink);width:50px;height:50px;color:var(--yellow);border:0;border-radius:50%}.icon-button.ink:hover{background:#0a3d0f}.icon-button[aria-pressed=true]{background:var(--mint);border-color:var(--leaf)}.guided-guide{align-items:flex-start;gap:10px;margin:6px 0 18px;display:flex}.guided-avatar{flex:none;width:96px;height:auto;margin:-4px 0 0 -8px}.guided-bubble{border:2px solid var(--line);border-radius:var(--radius);background:#fff;flex:1;min-width:0;padding:14px 16px;position:relative}.guided-bubble:before,.guided-bubble:after{content:"";border:7px solid #0000;border-right-color:var(--line);border-left:0;position:absolute;top:26px;left:-12px}.guided-bubble:after{border-right-color:#fff;left:-9px}.guided-bubble-text{letter-spacing:-.01em;font-size:17px;font-weight:650;line-height:1.35}.guided-bubble-sub{color:var(--muted);margin-top:6px;font-size:14px;line-height:1.45}.lion-note{align-items:center;gap:6px;margin-top:18px;display:flex}.lion-note-figure{flex:none;width:84px;height:auto}.lion-note p{color:var(--muted);font-size:14px;line-height:1.45}.guided-options{gap:10px;margin-bottom:10px;display:grid}.guided-options.grid{grid-template-columns:repeat(2,minmax(0,1fr))}.guided-options.grid3{grid-template-columns:repeat(3,minmax(0,1fr))}.guided-opt{text-align:left;width:100%;min-height:58px;color:var(--ink);border:2px solid var(--line);border-radius:var(--radius);box-shadow:0 4px 0 var(--line);background:#fff;align-items:center;gap:12px;padding:13px 16px;font-size:16px;font-weight:700;line-height:1.3;transition:background .12s,border-color .12s,transform 80ms,box-shadow 80ms;display:flex}.guided-opt:hover{background:var(--mint-50)}.guided-opt:active{box-shadow:0 0 0 var(--line);transform:translateY(4px)}.guided-opt.on{background:var(--mint);border-color:var(--leaf);box-shadow:0 4px 0 var(--mint-edge);color:var(--leaf)}.guided-options.grid .guided-opt,.guided-options.grid3 .guided-opt{text-align:center;justify-content:center;padding:13px 10px}.guided-options.grid3 .guided-opt{padding:12px 4px;font-size:14.5px}.guided-options.compact .guided-opt{min-height:52px;padding:11px 14px;font-size:15.5px}.guided-options .guided-opt[aria-current=true]{cursor:default}.guided-opt:disabled:not(.on){opacity:.55}.guided-badge{background:var(--mint-50);width:38px;height:38px;color:var(--leaf);border-radius:10px;flex:none;justify-content:center;align-items:center;font-size:13px;font-weight:800;display:inline-flex}.guided-opt.on .guided-badge{background:#fff}.guided-opt-text{flex:1;min-width:0}.guided-opt-text small{color:var(--muted);margin-top:2px;font-size:13px;font-weight:500;display:block}.guided-check{border:2px solid var(--line-strong);color:#0000;background:#fff;border-radius:8px;flex:none;justify-content:center;align-items:center;width:26px;height:26px;display:inline-flex}.guided-opt.on .guided-check{background:var(--leaf);border-color:var(--leaf);color:#fff}.guided-input,.guided-select{border:2px solid var(--line);border-radius:var(--radius);width:100%;min-height:56px;color:var(--ink);background:#fff;padding:14px 16px;font-size:18px;font-weight:600;box-shadow:inset 0 2px #052e090a}.guided-select{-webkit-appearance:none;appearance:none;background-image:linear-gradient(45deg, transparent 50%, var(--leaf) 50%), linear-gradient(135deg, var(--leaf) 50%, transparent 50%);background-position:calc(100% - 22px) 24px,calc(100% - 16px) 24px;background-repeat:no-repeat;background-size:6px 6px;padding-right:40px;font-size:16px}.guided-input::placeholder{color:#052e0966;font-weight:500}.guided-input:focus,.guided-select:focus{border-color:var(--leaf);outline:none}.guided-input.big{letter-spacing:.16em;text-align:center;font-variant-numeric:tabular-nums;font-size:26px}.guided-input.error{border-color:var(--danger);background:#fff6f5}.pill-input{border:2px solid var(--line);min-width:0;min-height:50px;color:var(--ink);background:#fff;border-radius:25px;flex:1;padding:11px 16px;font-size:16px;font-weight:500;line-height:24px}.pill-input::placeholder{color:#052e0973}.pill-input:focus{border-color:var(--leaf);outline:none}.guided-label{margin:14px 2px 6px;font-size:15px;font-weight:700;display:block}.guided-error{min-height:22px;color:var(--danger);margin:8px 2px 0;font-size:14px;font-weight:600}.guided-help{color:var(--muted);margin:6px 2px 0;font-size:14px;line-height:1.45}.guided-card{border:2px solid var(--line);border-radius:var(--radius);color:#052e09c7;background:#fff;margin:0 0 12px;padding:14px 16px;font-size:15.5px;line-height:1.5}.guided-card p+p{margin-top:10px}.guided-card.mint{background:var(--mint);border-color:var(--mint);color:var(--ink)}.guided-card h3{margin-bottom:6px;font-size:17px}.guided-card.code{text-align:center;width:100%;margin:18px 0 0}.guided-code{letter-spacing:.2em;color:var(--ink);margin-top:4px;font-size:30px;font-weight:800}.guided-summary{border:2px solid var(--line);border-radius:var(--radius);text-align:left;width:100%;margin:0;overflow:hidden}.guided-summary>div{border-top:1px solid var(--line);justify-content:space-between;align-items:center;gap:12px;padding:12px 16px;display:flex}.guided-summary>div:first-child{border-top:0}.guided-summary dt{color:var(--muted);flex:none;font-weight:600}.guided-summary dd{text-align:right;overflow-wrap:anywhere;margin:0;font-weight:700}.guided-feedback,.notice{border:2px solid var(--line);border-radius:var(--radius);background:var(--mint-50);color:var(--ink);overflow-wrap:anywhere;margin:0 0 12px;padding:12px 14px;font-size:14.5px;line-height:1.45}.guided-feedback,.notice.error{color:#8c271f;background:#fff5f3;border-color:#f1c7bf}.notice.success{background:var(--mint);border-color:var(--mint)}.guided-feedback p{margin:0 0 4px}.guided-feedback .guided-link,.notice .guided-link{text-align:left;justify-content:flex-start;width:100%;padding-left:0;display:block}.notice .guided-cta{margin-top:10px}.notice small{margin-top:6px}.guided-lang{border:1.5px solid var(--line);background:#fff;border-radius:999px;flex:none;display:inline-flex;overflow:hidden}.guided-lang button{min-height:44px;color:var(--muted);background:0 0;border:0;border-radius:999px;padding:0 10px;font-size:12.5px;font-weight:700;line-height:1}.guided-lang button:hover{background:var(--mint-50)}.guided-lang button[aria-pressed=true]{background:var(--mint);color:var(--leaf)}.guided-lang button:disabled{opacity:1;color:#052e0959}.guided-lang button:disabled[aria-pressed=true]{color:var(--leaf);opacity:.7}.preview{background:var(--yellow);text-align:center;padding:7px 12px;font-size:12px;font-weight:700}.network-banner{text-align:center;color:#735013;background:#fff2d5;padding:9px 16px;font-size:13px}.loading{min-height:60vh;color:var(--muted);place-items:center;display:grid}.app-shell{background:#fff;flex-direction:column;flex:1;max-width:100%;min-height:0;display:flex}.app-top{padding:14px var(--gutter) 6px;flex:none;justify-content:space-between;align-items:center;gap:12px;display:flex}.app-top img{width:92px;height:auto}.app-caption{padding:0 var(--gutter) 4px;color:var(--muted);overflow-wrap:anywhere;flex:none;font-size:13px}.app-content{flex:1;min-height:0;padding-bottom:80px;overflow-y:auto}.app-content>.notice{margin:8px var(--gutter)}.chat-content{flex-direction:column;padding:0;display:flex;overflow:hidden}.tab-bar{border-top:1px solid var(--line);z-index:10;padding:8px 8px calc(8px + env(safe-area-inset-bottom,0px));background:#fff;grid-template-columns:repeat(3,1fr);min-height:68px;display:grid;position:fixed;bottom:0;left:0;right:0}.tab-bar a{min-height:48px;color:var(--muted);flex-direction:column;justify-content:center;align-items:center;gap:4px;padding:4px 0;font-size:12px;font-weight:700;text-decoration:none;display:flex}.tab-bar a span{border-radius:999px;justify-content:center;align-items:center;width:56px;height:32px;display:inline-flex}.tab-bar a[aria-current=page]{color:var(--ink)}.tab-bar a[aria-current=page] span{background:var(--mint)}.desktop-brand{display:none}.signup-content{flex-direction:column;display:flex}.signup-stage{flex-direction:column;flex:1 0 auto;display:flex}.signup-account-actions{text-align:center;background:#fff;padding:0 16px 20px}.chat-page{min-height:0;padding-bottom:calc(68px + env(safe-area-inset-bottom,0px));flex-direction:column;flex:1;display:flex}.chat-notice{padding:6px var(--gutter) 0;flex:none}.chat-notice .guided-guide,.chat-notice .guided-options,.chat-notice .guided-cta{margin-bottom:12px}.thread{min-height:0;padding:8px var(--gutter) 12px;overscroll-behavior:contain;flex-direction:column;flex:1;gap:12px;display:flex;overflow-y:auto}.thread>.guided-link{align-self:center}.chat-start{flex:none}.chat-start .eyebrow{margin:0 2px 10px}.chat-start .guided-options{margin-bottom:0}.chat-start .guided-opt{min-height:54px;padding:12px 16px;font-size:15.5px}.chat-start .guided-help{margin-top:12px}.turn{flex-direction:column;flex:none;gap:8px;display:flex}.turn-row{align-items:flex-end;gap:8px;display:flex}.turn.learner .turn-row{justify-content:flex-end}.turn-avatar{flex:none;width:44px;height:auto}.bubble{overflow-wrap:anywhere;white-space:pre-wrap;max-width:82%;padding:12px 14px;font-size:16px;line-height:1.45}.bubble p{line-height:1.45}.bubble.learner{background:var(--yellow);color:var(--ink);border-radius:18px 18px 6px}.bubble.tutor{background:var(--mint-50);border-radius:18px 18px 18px 6px;flex:1;min-width:0;max-width:none}.bubble.pending{border:2px dashed var(--yellow-edge);background:#fff}.bubble small{color:var(--muted);margin-top:5px;font-size:11.5px}.bubble.learner small{color:#052e09b3}.review-notice{border-top:1px solid var(--line);margin-top:8px;padding-top:8px;font-size:13px}.turn-choices,.reply-choices{flex-wrap:wrap;gap:8px;display:flex}.turn-choices{padding-left:52px}.turn.learner .turn-choices{justify-content:flex-end;padding-left:0}.bubble .guided-link{min-height:0;color:var(--leaf);text-underline-offset:3px;padding:6px 0 0;text-decoration:underline;display:block}.composer-area{border-top:1px solid var(--line);min-height:0;padding:8px var(--gutter) 10px;background:#fff;flex-direction:column;flex-shrink:1;display:flex}.composer-area>.notice{margin:4px 0 8px}.composer{flex-shrink:0;align-items:flex-end;gap:8px;display:flex}.composer textarea{resize:none;max-height:140px}.composer .icon-button{margin-bottom:0}.composer-note{color:var(--muted);flex-shrink:0;padding:2px 2px 6px;font-size:13px}.reply-mode{gap:8px;margin-bottom:8px;display:flex}.reply-mode .chip{flex:1}.math-pad{border-top:1px solid var(--line);overscroll-behavior:contain;flex-shrink:1;min-height:0;max-height:calc(100vh - 235px);margin-top:8px;padding:5px 0 10px;overflow-y:auto}@supports (height:100dvh){.math-pad{max-height:calc(100dvh - 235px)}}.math-tabs{align-items:center;padding:5px 0 8px;display:flex}.math-tabs button,.math-subtabs button{border:1px solid var(--line);min-height:44px;color:var(--green);background:#fff;border-radius:16px;padding:8px 9px;font-size:.8rem;font-weight:700}.math-tabs button+button{margin-left:4px}.math-tabs button[role=tab]{flex:1}.math-tabs button[aria-selected=true],.math-subtabs button[aria-selected=true]{background:var(--green);color:#fff}.math-tabs .math-close{flex-shrink:0;width:44px}.math-subtabs{padding-bottom:8px;display:flex}.math-subtabs button+button{margin-left:5px}.math-subtabs button{flex:1}.math-hint{color:var(--muted);margin:0 0 8px;font-size:.75rem}.math-keys{grid-gap:5px;grid-template-columns:repeat(5,minmax(0,1fr));display:grid}.math-keys button{border:1px solid var(--line);overflow-wrap:anywhere;min-width:0;min-height:46px;color:var(--green);background:#f5f8f6;border-radius:10px;padding:4px 1px;font-size:1rem}.math-keys button[aria-pressed=true]{background:var(--mint);border-color:var(--green)}.page{max-width:680px;padding:4px var(--gutter) 30px;margin:0 auto}.page-lead{color:var(--muted);margin:4px 0 14px;font-size:14px;line-height:1.45}.search{align-items:center;gap:8px;margin:0 0 14px;display:flex}.paper-list{gap:12px;display:grid}.paper{border:2px solid var(--line);border-radius:var(--radius);box-shadow:0 4px 0 var(--line);background:#fff;align-items:center;gap:12px;padding:12px 14px;display:flex}.paper.saved{background:var(--mint);border-color:var(--mint);box-shadow:0 4px 0 var(--mint-edge);color:var(--leaf)}.paper-text{flex:1;min-width:0;font-size:15.5px;font-weight:700;line-height:1.3}.paper-text h2,.paper-text h3{overflow-wrap:anywhere;font-size:15.5px;font-weight:700;line-height:1.3}.paper-text small{margin-top:2px;font-size:13px;font-weight:500}.paper.saved .paper-text small{color:#2f4a33}.paper-text .guided-link{min-height:32px;padding:4px 0 0;font-size:14px;display:inline-flex}.paper-actions{flex-direction:column;flex:none;align-items:flex-end;gap:6px;display:flex}.empty-state{border:2px solid var(--line);border-radius:var(--radius);text-align:center;background:#fff;padding:28px 18px}.empty-state h2{font-size:20px}.empty-state p{color:var(--muted);margin:10px 0 14px;font-size:14px}.empty-state .guided-cta{margin-bottom:6px}.saved-section{margin-top:26px}.saved-section h2{margin-bottom:4px}.saved-section>.fine{margin-bottom:12px}.show-more{justify-content:center;margin-top:12px;display:flex}.profile-head{align-items:center;gap:14px;margin:6px 0 16px;display:flex}.avatar{background:var(--mint);width:64px;height:64px;color:var(--leaf);border-radius:50%;flex:none;justify-content:center;align-items:center;font-size:26px;font-weight:800;display:inline-flex}.profile-head>div{min-width:0}.profile-head h1{overflow-wrap:anywhere}.profile-head p{color:var(--muted);margin-top:2px;font-size:14px}.settings{margin-top:22px}.settings h2{margin-bottom:8px}.settings>p{color:var(--muted);font-size:14px}.settings .guided-cta{margin-top:14px}.settings .fine{margin-top:8px}.setting-row{border-bottom:1px solid var(--line);justify-content:space-between;gap:12px;padding:11px 0;font-size:14.5px;display:flex}.setting-link{text-align:left;border:0;border-bottom:1px solid var(--line);width:100%;min-height:48px;color:var(--leaf);background:0 0;padding:13px 0;font-size:15px;font-weight:700;text-decoration:none;display:block}.setting-link.danger,.guided-link.danger{color:var(--danger)}.account-username{overflow-wrap:anywhere}.profile-actions{flex-direction:column;align-items:center;gap:10px;margin-top:22px;display:flex}.connection-status{color:var(--leaf);margin-top:6px;font-weight:700}.account-connection .guided-card,.account-connection .guided-cta{margin-top:12px}.account-connection .guided-link{width:100%;margin-top:4px;display:block}@media (max-width:339px){:root{--gutter:14px}.composer{gap:5px}.bubble{max-width:90%}.guided-avatar{width:80px}}@media (min-width:960px){.app-shell{grid-template-rows:140px 1fr;grid-template-columns:230px minmax(0,1fr);display:grid}.desktop-brand{background:var(--ink);grid-area:1/1;padding:24px;display:block}.desktop-brand img{object-fit:contain}.desktop-brand p{color:var(--yellow);margin-top:16px;font-size:13px}.tab-bar{background:var(--ink);border:0;flex-direction:column;grid-area:2/1;padding:16px;display:flex;position:static}.tab-bar a{color:#fff;border-radius:14px;flex-direction:row;justify-content:flex-start;gap:12px;margin-bottom:10px;padding:8px;font-size:15px}.tab-bar a span{width:40px;height:40px}.tab-bar a[aria-current=page]{background:var(--mint);color:var(--ink)}.app-content{grid-area:1/2/3;padding-bottom:0}.app-top{justify-content:flex-end;padding-top:16px}.app-top img{display:none}.app-caption{text-align:right}.chat-page{width:100%;max-width:850px;margin:0 auto;padding-bottom:0}.thread,.chat-notice{padding-left:36px;padding-right:36px}.composer-area{padding:10px 36px 14px}.page{padding-top:10px}}@media (prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;transition:none!important;animation:none!important}}
