:root{font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif;color:#eadfc8;background:#14251f;font-synthesis:none;font-weight:400;--cream: #f0e5ca;--muted: #a9b3a0;--gold: #e9c77a;--line: #3c4a3d;--dark: #152720;--mint: #b6cf9c}*{box-sizing:border-box}body{margin:0;background:radial-gradient(ellipse at 60% 20%,#2b3e2c 0,transparent 58%),#14251f}button,a,input,textarea{font:inherit}button{cursor:pointer;color:inherit;background:none;border:1px solid var(--line);border-radius:5px;min-height:44px;padding:9px 13px;transition:background .15s,border-color .15s}button:hover{background:#354532;border-color:#9da87b}button:disabled{opacity:.35;cursor:default}button:focus-visible,a:focus-visible,input:focus-visible,textarea:focus-visible,[tabindex]:focus-visible{outline:3px solid #e9c77a;outline-offset:3px}a{color:inherit;text-decoration:none}.shell{max-width:1220px;margin:auto;padding:0 38px}.topbar{height:102px;display:flex;align-items:center;justify-content:space-between;border-bottom:1px solid var(--line);gap:15px}.brand{font-size:19px;letter-spacing:3px;display:flex;align-items:center;gap:13px;font-weight:750;flex-wrap:wrap;position:relative}.brand-mark{background:var(--gold);color:#203127;padding:3px 8px;line-height:29px;font-family:Georgia,serif;font-size:29px;box-shadow:3px 3px #5c6745}.edition{display:block;position:absolute;top:43px;left:50px;font-size:8px;letter-spacing:1.7px;color:#a4af99;font-weight:500}.top-actions{display:flex;gap:9px;font-size:12px}.top-actions button{border-color:transparent}.top-actions button:last-child{border-color:var(--line)}.layout{display:grid;grid-template-columns:222px minmax(0,1fr);gap:43px;padding:36px 0 28px}.sidebar{padding-right:21px;border-right:1px solid var(--line);position:relative}.eyebrow{font-size:10px;font-weight:700;letter-spacing:2px;color:#a9b29d;margin:0}.sidebar h2{font-family:Georgia,serif;font-size:29px;font-weight:400;line-height:1.2;margin:17px 0 10px;position:relative}.chapter-number{position:absolute;right:2px;top:2px;font-family:monospace;font-size:11px;border:1px solid #6a775a;border-radius:50%;padding:6px;color:#bcc6a8}.sidebar-note{font-size:11px;color:#acb59f;margin:0 0 30px;line-height:1.6}.room-link{display:flex;align-items:center;gap:10px;text-align:left;width:100%;border-color:transparent;padding:12px 8px;margin-bottom:5px;font-size:11px;min-height:53px}.room-link.selected{background:#364731;color:var(--cream);border-color:#5d7048}.room-num{color:#9cad84;font-family:monospace;font-size:11px}.selected .room-num{color:var(--gold)}.room-arrow{margin-left:auto;color:var(--gold)}.journey-progress{border-top:1px solid var(--line);margin-top:26px;padding-top:21px;font-size:10px;color:#b1bca4}.progress-track{height:4px;background:#3b4938;margin-top:12px}.progress-track i{display:block;background:#b6c88e;height:100%}.sidebar-foot{font-family:Georgia,serif;font-style:italic;font-size:12px;line-height:1.7;color:#9aa58f;margin-top:29px}.room-heading{display:flex;align-items:center;justify-content:space-between;margin:0 0 20px}.eyebrow span{padding:0 7px;color:#718364}h1{font-family:Georgia,serif;font-weight:400;font-size:38px;letter-spacing:-1px;margin:10px 0 6px;line-height:1.15}.subtitle{color:#b6bea8;font-size:12px;margin:0}.room-seal{border:1px solid #65754f;border-radius:50%;font-family:Georgia,serif;font-size:29px;width:48px;height:48px;display:grid;place-items:center;color:var(--gold)}.scene{position:relative;border:1px solid #536146;box-shadow:inset 0 0 0 5px #14251f;overflow:hidden;border-radius:7px;background:#23382e}.scene canvas{width:100%;display:block;image-rendering:pixelated;max-height:265px;object-fit:cover}.scene-label{position:absolute;top:14px;left:16px;font-size:8px;letter-spacing:1.5px;background:#192a24d9;padding:7px 9px;color:#c6cfad;border:1px solid #506043}.scene-caption{position:absolute;bottom:10px;right:16px;font-family:Georgia,serif;font-style:italic;font-size:10px;color:#cbd1ae;background:#213127cc;padding:4px 8px}.guide{display:flex;gap:12px;padding:18px 0 19px;align-items:center}.pip-icon{background:#a65f41;border:3px solid #d19559;box-shadow:0 3px #30271c;color:#f5deaa;font-family:Georgia,serif;font-size:19px;width:35px;min-width:35px;height:38px;display:grid;place-items:center;clip-path:polygon(20% 0,80% 0,80% 10%,100% 10%,100% 100%,0 100%,0 10%,20% 10%)}.guide strong{font-size:8px;letter-spacing:1.3px;color:#d4b67b}.guide p{font-size:12px;color:#c6ccb6;line-height:1.6;margin:4px 0 0;max-width:650px}.proof-workspace{background:#efe7d3;color:#23332c;border-radius:7px;overflow:hidden;border:1px solid #e4d7b6;box-shadow:0 5px 15px #0d1e1730}.proof-heading{padding:11px 17px 9px;display:flex;justify-content:space-between;align-items:center;border-bottom:1px solid #cfc8b4;gap:5px}.proof-heading .eyebrow{color:#4e5b43;font-size:9px;letter-spacing:1.5px}.branch-tabs{display:flex;align-items:center;gap:4px;font-size:9px;color:#4e5b43}.branch-tabs button{padding:3px 7px;min-height:28px;border-color:#b6baa4;font-size:10px}.branch-tabs button[aria-pressed=true]{background:#d2d9be}.branch-tabs button:hover{background:#d6dec5}.proof-columns{display:grid;grid-template-columns:1fr 1.15fr;min-height:143px}.hypotheses{padding:16px;border-right:1px solid #c9c8b3;min-width:0}.goal-pane{padding:16px;min-width:0;display:flex;flex-direction:column}.proof-columns h2{font-size:9px;letter-spacing:1px;font-weight:700;color:#4e5b43;margin:0 0 12px}.proof-columns h2 span{font-family:Georgia,serif;font-weight:400;text-transform:none;letter-spacing:0;opacity:1;margin-left:4px}.context{max-height:145px;overflow:auto}.fact{display:flex;gap:10px;align-items:baseline;font-family:Georgia,serif;font-size:18px;margin-bottom:5px;overflow-wrap:anywhere}.fact code{font-family:monospace;font-size:10px;background:#dce0c8;color:#536448;padding:3px 5px;border-radius:3px;flex-shrink:0}.empty{font-size:12px;color:#4e5b43;font-family:Georgia,serif;font-style:italic;margin:9px 0}.formula{font-family:Georgia,serif;font-size:25px;line-height:1.4;overflow-wrap:anywhere;flex:1}.goal-note{font-size:10px;color:#4e5b43;margin:9px 0 0}.choices{display:flex;gap:10px;margin-top:17px;align-items:stretch}.choice{flex:1;min-width:0;position:relative;text-align:left;padding:14px 28px 13px 14px;background:#263b2d;border-color:#556647;min-height:74px}.choice>span:first-child{display:block;font-size:12px;font-weight:600}.choice code{display:block;margin-top:7px;color:#b5c69a;font-size:10px;overflow-wrap:anywhere}.choice-arrow{position:absolute;right:11px;top:14px;color:#becfa1;font-size:12px}.feedback{min-height:20px;font-size:11px;color:#c5cbb5;margin:12px 0;line-height:1.5}.feedback.success{color:#d9cc8a}.toolbar{display:flex;align-items:center;justify-content:space-between;border-top:1px solid var(--line);padding-top:10px;gap:4px;flex-wrap:wrap}.toolbar>div{display:flex;gap:2px}.toolbar button{font-size:10px;border-color:transparent;padding:7px;min-height:36px;color:#b9c4a9}.save-status{display:block;width:100%;text-align:right;font-size:8px;color:#86987d}.page-footer{display:flex;justify-content:space-between;border-top:1px solid var(--line);padding:19px 0 25px;font-size:8px;letter-spacing:1.2px;color:#7d9075}.completion,.dead-end{display:flex;gap:10px;align-items:center;width:100%;padding:10px;background:#33482e;border:1px solid #687b4d;border-radius:6px}.completion strong{color:var(--gold);font-family:Georgia,serif;font-size:20px}.completion span,.dead-end span{font-size:11px;flex:1}.primary{background:var(--gold);color:#263324;border-color:var(--gold);font-weight:650}.primary:hover{background:#f7d991;color:#263324}dialog{background:#f0e7d2;color:#28352b;border:1px solid #d9cba9;border-radius:10px;max-width:580px;width:calc(100% - 30px);max-height:85dvh;padding:24px;box-shadow:0 30px 100px #0007}dialog::backdrop{background:#0b1813ba;-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px)}dialog header{display:flex;justify-content:space-between;gap:10px;align-items:center}dialog h2{font: 28px Georgia,serif;margin:0}dialog h3{font-size:13px;margin-top:22px}dialog p{font-size:13px;line-height:1.65;color:#4e5b43}dialog button{border-color:#aab394}dialog button:hover{background:#d5dec2}dialog button.primary:hover{background:#e4c581}.room-menu{display:grid;grid-template-columns:1fr 1fr;gap:7px}.room-menu button{text-align:left;font-size:12px}.coming{margin:20px 0}.coming p{display:flex;justify-content:space-between;margin:8px 0}.coming span{font-size:10px;color:#4e5b43}pre{background:#e0dfcb;border:1px solid #c0c4ab;border-radius:5px;padding:15px;white-space:pre-wrap;font-size:12px;line-height:1.8;overflow-wrap:anywhere}textarea{width:100%;height:110px;background:#faf4e5;color:#29352b;border:1px solid #b7bea5;border-radius:5px;font:11px monospace;padding:10px;margin:10px 0;resize:vertical}.dialog-actions{display:flex;gap:10px}.small{font-size:11px!important}.volume{display:flex;justify-content:space-between;align-items:center;font-size:12px}.volume input{max-width:50%}dialog label{font-size:12px}@media(min-height:800px)and (min-width:900px){.shell{padding:0 48px}.layout{padding-top:42px}.scene canvas{height:250px}.guide{padding:21px 0}.proof-columns{min-height:155px}}@media(max-width:850px){.shell{padding:0 20px}.layout{grid-template-columns:160px minmax(0,1fr);gap:22px}.sidebar{padding-right:14px}.sidebar h2{font-size:25px}.room-link{font-size:10px;gap:7px}.chapter-number{display:none}h1{font-size:32px}.fact{font-size:16px}.formula{font-size:22px}.choice{padding:12px}.choice-arrow{display:none}.choice>span:first-child{font-size:11px}.completion{flex-wrap:wrap}}@media(max-width:600px){.shell{padding:0 14px}.topbar{height:72px}.brand{font-size:14px;letter-spacing:1.7px;gap:9px}.brand-mark{font-size:24px;line-height:24px;padding:2px 6px}.edition{display:none}.top-actions{gap:0;font-size:10px}.top-actions button{padding:8px}.layout{display:block;padding-top:22px}.sidebar{display:none}.room-heading{margin-bottom:15px}h1{font-size:29px}.subtitle{font-size:11px}.scene canvas{min-height:135px;object-fit:cover}.scene-caption{display:none}.guide{padding:16px 0}.guide p{font-size:11px}.proof-columns{grid-template-columns:1fr 1fr}.hypotheses,.goal-pane{padding:12px}.formula{font-size:20px}.fact{font-size:15px}.proof-columns h2{font-size:8px;letter-spacing:.5px}.proof-columns h2 span{display:none}.choices{gap:6px}.choice{padding:10px 8px;min-height:72px}.choice code{font-size:9px}.choice>span:first-child{font-size:10px}.toolbar button{font-size:10px;padding:6px}.page-footer{font-size:7px;letter-spacing:.7px}.room-seal{height:38px;width:38px;font-size:24px}.completion strong{font-size:18px}.completion button{margin-left:auto}}.expand-game{display:grid;place-items:center;min-width:32px;min-height:32px;border:1px solid var(--line);border-radius:5px;font-size:22px}.compact-more,.short-proof-label{display:none}@media(max-height:500px){body{height:100dvh;overflow:hidden}.shell{padding:0 6px;max-width:900px;height:100dvh}.topbar{height:32px;min-height:32px;gap:4px}.brand{font-size:13px;letter-spacing:0;gap:6px}.brand-mark{font-size:18px;line-height:22px;padding:0 4px;box-shadow:none}.edition,.sidebar,.room-heading,.guide,.page-footer,.goal-note,.save-status,.scene-label,.scene-caption,.toolbar .secondary-control{display:none}.top-actions{font-size:12px;gap:2px}.top-actions button{min-height:30px;padding:3px 6px}.layout{display:block;padding:4px 0;height:calc(100dvh - 32px)}main{height:100%;display:grid;grid-template-columns:clamp(72px,24vw,160px) minmax(0,1fr);grid-template-rows:minmax(78px,1fr) auto 28px 28px;gap:4px;min-height:0}.scene{display:flex;align-items:center;grid-column:1;grid-row:1;min-height:0}.scene canvas{width:100%;height:100%;max-height:none;object-fit:contain}.proof-workspace{grid-column:2;grid-row:1;min-height:0;min-width:0;display:flex;flex-direction:column;border-radius:5px}.proof-heading{padding:0 4px;height:28px;min-height:28px;gap:2px}.branch-tabs{font-size:12px;gap:2px;flex-shrink:0}.branch-tabs>span{display:none}.branch-tabs button{min-width:25px;min-height:25px;padding:2px;font-size:12px}.proof-columns{min-height:0;flex:1;grid-template-columns:1fr 1fr;overflow:hidden}.hypotheses,.goal-pane{padding:3px 5px;display:flex;flex-direction:column;min-height:0}.proof-columns h2{font-size:11px;letter-spacing:0;margin-bottom:2px;flex-shrink:0}.proof-columns h2 span{display:none}.context{flex:1;min-height:0;max-height:none;overflow:auto}.fact{font-size:18px;line-height:1.2;gap:4px;margin-bottom:3px}.fact code{font-size:11px;padding:1px 2px}.formula{font-size:20px;line-height:1.15;min-height:0;overflow:auto}.empty{font-size:12px;line-height:1.2;margin:0}.choices{grid-column:1 / -1;margin:0;gap:4px;min-width:0}.choice{min-height:56px;padding:4px 6px}.choice>span:first-child{font-size:14px;line-height:1.15}.choice code{font-size:12px;line-height:1.2;margin-top:3px;white-space:nowrap;overflow:auto}.choice-arrow{display:none}.feedback{grid-column:1 / -1;font-size:12px;line-height:1.15;height:28px;min-height:0;overflow:auto;margin:0}.toolbar{grid-column:1 / -1;padding:0;flex-wrap:nowrap;min-height:28px;height:28px}.toolbar button{min-height:28px;padding:2px 8px;font-size:13px}.compact-more{display:block}.completion,.dead-end{padding:3px 6px;min-height:56px;flex-wrap:nowrap}.completion strong{font-size:16px}.completion span{display:none}.completion button,.dead-end button{min-height:40px;padding:5px 8px;font-size:14px}.dead-end span{font-size:12px}dialog{padding:15px;max-height:94dvh}dialog h2{font-size:21px}}@media(prefers-reduced-motion:no-preference){.proof-workspace{animation:arrive .18s ease-out}@keyframes arrive{0%{opacity:1;transform:translateY(2px)}to{opacity:1;transform:none}}}@media(prefers-reduced-motion:reduce){*{animation:none!important;transition:none!important;scroll-behavior:auto!important}}details{margin:18px 0;font-size:12px}summary{cursor:pointer;min-height:32px;padding:8px 0}dt{font-weight:700;margin-top:10px}dd{margin:4px 0;line-height:1.5}.standalone{text-decoration:underline;text-underline-offset:3px}.room-seal,.scene-label{color:var(--room-accent, var(--gold))}.scene{border-top:3px solid var(--room-accent, var(--gold))}.lantern-count,.compact-room{display:none}.story-button{font-size:10px;margin-left:auto;flex-shrink:0}@media(max-height:500px){.brand-name{display:none}.lantern-count{display:inline;color:var(--room-accent, var(--gold));font-size:12px;letter-spacing:1px}.proof-state-label{display:none}.compact-room{display:block;min-height:24px;min-width:0;flex:1;border:0;padding:2px 0;font-size:13px;font-weight:650;color:#34452f;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;text-align:left}.compact-room:hover{background:#d2d9be}.proof-workspace{border-top:3px solid var(--room-accent, var(--gold))}}@media(max-height:500px)and (max-width:400px){.choice>span:first-child{font-size:13px}.full-proof-label{display:none}.short-proof-label{display:inline}}.arrival-heading,.arrival-start{display:none}@media(max-height:500px)and (max-width:400px){main{grid-template-columns:minmax(0,1fr)}.shell[data-stage=proof] main:has(>.feedback.idle){grid-template-rows:minmax(78px,1fr) auto 28px}.feedback.idle,.scene{display:none}.proof-workspace{grid-column:1}.shell[data-stage=arrival] main{grid-template-rows:32px minmax(70px,1fr) 40px}.shell[data-stage=arrival] .arrival-heading{display:flex;align-items:center;justify-content:space-between;gap:4px}.arrival-heading h2{font-size:16px;margin:0}.arrival-heading button{min-height:28px;padding:3px 8px;font-size:13px}.shell[data-stage=arrival] .scene{display:flex;grid-column:1;grid-row:2}.shell[data-stage=arrival] .arrival-start{display:block;grid-column:1;grid-row:3;min-height:40px;padding:4px 12px;font-size:16px}.shell[data-stage=arrival] .proof-workspace,.shell[data-stage=arrival] .choices,.shell[data-stage=arrival] .feedback,.shell[data-stage=arrival] .toolbar{display:none}}.parameters{margin-top:12px;padding-top:8px;border-top:1px solid var(--line);font-size:12px;line-height:1.5}.parameters strong{display:block;margin-bottom:4px}