#solve-notebook,.solve-library{--surface:#fff;--rail:#eef1f6;--success:#28624b;--danger:#ad473d;--danger-bg:#fff2ef}
[data-theme=dark] #solve-notebook,[data-theme=dark] .solve-library{--surface:#171f2c;--rail:#111820;--success:#85cda0;--danger:#e57368;--danger-bg:#35201e}
body.solve-open{overflow:hidden}
.solve-exercise-entry{display:flex;align-items:center;gap:9px;margin-top:18px;color:var(--forest);background:var(--surface,var(--paper));border:1px solid var(--line);font-size:13px;font-weight:600}
.solve-exercise-entry svg,.solve-shell svg,.solve-library svg{width:20px;height:20px;fill:none;stroke:currentColor;stroke-width:1.7;flex:none}
#solve-notebook{position:fixed;inset:0;width:100vw;height:100dvh;max-width:none;max-height:none;margin:0;padding:0;border:0;border-radius:0;color:var(--ink);background:var(--paper);overscroll-behavior:none}
#solve-notebook::backdrop{background:var(--paper)}
.solve-shell{height:100%;display:flex;flex-direction:column;font-family:MarginSans,sans-serif}
.solve-shell button,.solve-shell select{min-height:44px;font-size:13px}
.solve-shell button{display:inline-flex;align-items:center;justify-content:center;gap:8px}
.solve-shell [hidden]{display:none!important}
.solve-header{display:grid;grid-template-columns:1fr auto 1fr;align-items:center;gap:16px;min-height:72px;padding:12px 24px;border-bottom:1px solid var(--line);background:var(--surface)}
.solve-header>button{justify-self:start;border:0;font-size:13px}
.solve-identity{display:flex;align-items:center;gap:18px;font-size:13px;color:var(--muted)}
.solve-wordmark{font:400 30px/1 MarginSerif,serif;letter-spacing:-.045em;color:var(--ink);border-right:1px solid var(--line);padding-right:18px}
.solve-save{justify-self:end;display:flex;gap:8px;align-items:center;font-size:12px;color:var(--muted);text-align:right}
.solve-save [role=status]:before{content:"";display:inline-block;width:6px;height:6px;margin-right:7px;border-radius:50%;background:var(--success)}
.solve-tools{display:flex;align-items:center;justify-content:center;gap:20px;padding:8px 20px;min-height:68px;border-bottom:1px solid var(--line);background:var(--surface);flex-wrap:wrap}
.solve-tool-group{display:flex;align-items:center;gap:4px}.solve-tool-group button{border-color:transparent;background:transparent;padding:8px 12px}
.solve-tool-group button[aria-pressed=true]{background:var(--sage);color:var(--forest);border-color:var(--line)}
.solve-colors{display:flex;gap:3px;align-items:center;border-left:1px solid var(--line);padding-left:16px}
.solve-shell .solve-swatch{padding:5px;min-width:34px;min-height:44px;background:transparent;border:0;position:relative}
.solve-swatch span{width:19px;height:19px;border-radius:50%;background:var(--swatch);border:1px solid #0002}
.swatch-0{--swatch:#243247}.swatch-1{--swatch:#4d48a7}.swatch-2{--swatch:#28624b}.swatch-3{--swatch:#ad473d}.swatch-4{--swatch:#eed577}
.solve-swatch[aria-pressed=true] span{outline:2px solid var(--ink);outline-offset:4px}
.solve-width,.solve-paper-label{display:flex;align-items:center;gap:6px;font-size:12px;color:var(--muted)}
.solve-tools select{width:auto;margin:0;padding:8px;border:0;background:var(--rail);min-width:90px}
.solve-finger{display:flex;align-items:center;gap:7px;font-size:12px;color:var(--muted);margin:0;white-space:nowrap}
.solve-finger input{width:16px;height:16px;min-height:0;margin:0}
.solve-body{display:grid;grid-template-columns:minmax(0,1fr) 340px;flex:1;min-height:0}
.solve-writing{display:flex;flex-direction:column;min-height:0;min-width:0;background:var(--rail)}
.solve-page-meta{display:flex;justify-content:space-between;align-items:center;padding:6px 24px;font-size:12px;color:var(--muted);min-height:50px}
.solve-page-meta>div{display:flex;gap:2px}.solve-page-meta button{border:0;background:transparent;padding:8px 12px}
.solve-viewport{overflow:auto;flex:1;min-height:0;overscroll-behavior:contain;scrollbar-gutter:stable;padding:8px 12px 24px}
.solve-page{margin:0 auto;background:#fff;box-shadow:0 2px 16px #202d4412;position:relative;flex:none}
.solve-page[data-paper=grid]{background-image:linear-gradient(#e9edf3 1px,transparent 1px),linear-gradient(90deg,#e9edf3 1px,transparent 1px);background-size:3.3333% 2.5%}
.solve-page[data-paper=lined]{background-image:linear-gradient(#e9edf3 1px,transparent 1px);background-size:100% 2.5%}
#solve-canvas{display:block;width:100%;height:100%;touch-action:none;user-select:none;cursor:crosshair;outline-offset:0}
#solve-canvas[data-tool=eraser]{cursor:cell}
.solve-page-footer{display:flex;justify-content:space-between;align-items:center;gap:12px;min-height:54px;padding:5px 20px;border-top:1px solid var(--line);color:var(--muted);font-size:11px;background:var(--surface)}
.solve-page-footer>div{display:flex;gap:3px}.solve-page-footer button{padding:8px 10px;border:0;background:transparent;white-space:nowrap}
.solve-tutor{display:flex;flex-direction:column;overflow:auto;padding:24px;border-left:1px solid var(--line);background:var(--surface);min-height:0;min-width:0}
.solve-exercise{padding-bottom:24px;border-bottom:1px solid var(--line)}
.solve-exercise>summary{font-size:11px;font-weight:600;letter-spacing:.09em;text-transform:uppercase;color:var(--muted);cursor:pointer;padding:4px 0}
.solve-exercise .prose{font-size:16px;line-height:1.7;margin-top:16px;overflow-wrap:anywhere}.solve-exercise .prose p{margin:0}
.solve-tutor-heading{display:flex;align-items:center;gap:10px;margin:26px 0 18px}
.solve-tutor-mark{font:400 26px/1 MarginSerif,serif;color:var(--forest);background:var(--sage);width:38px;height:38px;border-radius:50%;display:grid;place-items:center;flex:none}
.solve-tutor-heading strong{font-size:13px}.solve-tutor-heading small{display:block;font-size:10px;color:var(--muted);margin-top:3px;max-width:18ch}
.solve-tutor-heading>button{margin-left:auto;border:0;padding:6px;font-size:11px;white-space:nowrap}
.solve-feedback{min-height:160px}.solve-feedback .eyebrow{font-size:10px;letter-spacing:.08em;line-height:1.5}
#solve-subtitle{font-size:19px;line-height:1.6;letter-spacing:-.015em;margin:12px 0 18px;overflow-wrap:anywhere}
#solve-reviewed{font-size:11px;line-height:1.6}#solve-error{color:var(--danger);font-size:12px;line-height:1.6;overflow-wrap:anywhere}
.solve-reply-actions{display:flex;flex-wrap:wrap;gap:6px}.solve-reply-actions button{font-size:12px;background:transparent;border-color:var(--line)}
.solve-talk{margin-top:auto;padding-top:24px}
#solve-mic{width:100%;min-height:58px;background:var(--forest);color:var(--paper);border-color:transparent;font-weight:600;border-radius:12px}
#solve-mic svg{width:22px;height:22px}
[data-phase=recording] #solve-mic{background:var(--danger);color:var(--paper);box-shadow:0 0 0 4px var(--danger-bg)}
#solve-mic-state{font-size:11px;text-align:center;color:var(--muted);line-height:1.5;min-height:32px;margin:10px 0}
#solve-ask-form{display:flex;align-items:center;gap:6px;border:1px solid var(--line);border-radius:10px;padding:5px 6px 5px 12px;background:var(--paper)}
#solve-ask-form:focus-within{border-color:var(--forest)}
#solve-ask-form textarea{min-height:48px;max-height:120px;resize:vertical;flex:1;min-width:0;background:transparent;border:0;padding:6px 0;margin:0;font-size:13px;line-height:1.5;outline:0}
#solve-ask-form button{border:0;background:var(--sage);color:var(--forest);padding:8px 12px;font-size:20px}
.solve-transcript{margin-top:16px}.solve-transcript>summary{cursor:pointer;color:var(--muted);font-size:12px;padding:8px 0}
.solve-turn{padding:16px 0;border-top:1px solid var(--line)}.solve-turn strong{font-size:11px;color:var(--muted)}.solve-turn p{font-size:13px;line-height:1.7;margin:5px 0 12px;overflow-wrap:anywhere}.solve-turn small{font-size:10px;color:var(--muted)}
.solve-disclosure{font-size:10px;line-height:1.6;color:var(--muted);margin:18px 0 0}
.solve-library{width:min(620px,calc(100vw - 32px));max-height:85dvh;padding:28px;background:var(--surface);color:var(--ink)}
.solve-library-heading{display:flex;justify-content:space-between;align-items:center;gap:16px;margin-bottom:24px}.solve-library-heading h2{font:400 32px/1.3 MarginSerif,serif;margin:8px 0 0}
.solve-saved-row{display:grid;grid-template-columns:28px 1fr 20px;gap:14px;text-align:left;width:100%;background:transparent;border:0;border-bottom:1px solid var(--line);border-radius:0;padding:16px 0;min-height:72px}
.solve-saved-row strong{font-size:14px;display:-webkit-box;-webkit-box-orient:vertical;-webkit-line-clamp:2;overflow:hidden}.solve-saved-row small{display:block;color:var(--muted);font-size:11px;margin-top:7px}
.solve-new-form{border-top:1px solid var(--line);padding-top:22px;margin-top:20px}.solve-new-form label{font-weight:500}.solve-new-form textarea{min-height:76px;margin:10px 0 14px}
@media(max-width:1100px){.solve-tools{gap:10px}.solve-finger{font-size:11px}.solve-body{grid-template-columns:minmax(0,1fr) 300px}.solve-tutor{padding:20px}.solve-width>span,.solve-paper-label>span{display:none}.solve-page-footer>span{display:none}}
@media(max-width:760px){.solve-header{grid-template-columns:1fr auto;min-height:60px;padding:8px 12px;gap:8px}.solve-identity{display:none}.solve-save{font-size:10px;max-width:160px}.solve-header>button{font-size:12px;padding:8px}.solve-tools{justify-content:flex-start;padding:5px 8px;gap:6px;min-height:56px;flex-wrap:nowrap;overflow-x:auto;flex:none}.solve-tools>*{flex:none}.solve-tool-group button{padding:8px}.solve-tool-group button>span{display:none}.solve-colors{padding-left:7px}.solve-shell .solve-swatch{min-width:30px}.solve-tools select{min-width:76px}.solve-body{display:flex;flex-direction:column}.solve-writing{flex:1;min-height:180px}.solve-page-meta{min-height:42px;padding:0 12px}.solve-page-meta button{min-height:40px}.solve-viewport{padding:3px 6px 12px}.solve-page-footer{min-height:45px;padding:0 8px}.solve-page-footer>div{margin-left:auto}.solve-tutor{flex:none;border-left:0;border-top:1px solid var(--line);padding:12px 16px;max-height:42dvh;display:grid;grid-template-columns:1fr;overflow:auto}.solve-exercise{padding-bottom:8px;border:0}.solve-exercise[open] .prose{font-size:13px;line-height:1.5;margin-top:6px;max-height:60px;overflow:auto}.solve-exercise>summary{font-size:10px}.solve-tutor-heading{display:none}.solve-feedback{min-height:0}.solve-feedback .eyebrow{display:none}#solve-subtitle{font-size:15px;line-height:1.5;margin:4px 0 8px}#solve-reviewed{margin:4px 0}.solve-talk{padding-top:6px;margin:0}#solve-mic{min-height:48px}#solve-mic-state{min-height:0;font-size:10px;margin:6px 0}#solve-ask-form textarea{min-height:40px;max-height:70px}.solve-transcript{margin-top:4px}.solve-disclosure{margin-top:6px;font-size:9px}.solve-reply-actions{margin-bottom:5px}.solve-library{padding:22px}.solve-tutor .field-help{font-size:10px}}
@media(prefers-reduced-motion:reduce){.solve-shell *{transition:none!important}}

@media(max-width:760px){.solve-tutor-heading{display:flex;margin:4px 0 8px}.solve-tutor-heading small{display:none}.solve-tutor-mark{width:28px;height:28px;font-size:20px}.solve-tutor-heading>button{min-height:32px}}