/* Paper workspace. Keep the classroom's ink, ruled borders and warm stock. */
body[data-page="lab"] .shell{width:calc(100% - 64px);max-width:1600px;}
body[data-page="lab"] .portal-nav{min-height:76px;}
body[data-page="lab"] .portal-nav .brand{font-size:20px;}
body[data-page="lab"] .portal-nav .brand img{width:36px;height:36px;}
body[data-page="lab"] .route-trail{padding-top:13px;font-size:11px;}
body[data-page="lab"] .portal-main{padding-top:16px;padding-bottom:28px;}
body[data-page="lab"] .portal-footer{padding-block:20px;}
.lab-top{display:flex;align-items:center;justify-content:space-between;gap:24px;border-bottom:1px solid var(--line-strong);padding-bottom:16px;margin-bottom:18px;}
.lab-top h1{font-size:27px;line-height:1.6;margin:0;font-weight:600;}
.lab-kicker{font:10px/1.5 ui-monospace,Consolas,monospace;letter-spacing:1.5px;color:var(--muted);margin:0 0 5px;}
.lab-workspace{display:grid;grid-template-columns:350px minmax(0,1fr);gap:18px;align-items:stretch;height:clamp(620px,calc(100dvh - 210px),1100px);min-width:0;}
.lab-instructions{min-height:0;min-width:0;display:flex;flex-direction:column;border:1px solid var(--line-strong);background:var(--white);border-radius:4px;}
.mission-navigation{display:flex;align-items:center;gap:12px;padding:13px 16px;border-bottom:1px solid var(--line);}
.mission-navigation-label{font-size:11px;color:var(--muted);white-space:nowrap;}
.mission-path{display:flex;gap:7px;list-style:none;margin:0;padding:0;flex:1;justify-content:space-between;}
.mission-path li{min-width:0;}
.mission-path button{display:grid;place-items:center;width:30px;height:30px;padding:0;border:1px solid var(--line-strong);border-radius:50%;font:12px/1 ui-monospace,Consolas,monospace;background:transparent;color:var(--ink);cursor:pointer;}
.mission-path button[aria-current="step"]{outline:2px solid var(--teal);outline-offset:2px;border-color:var(--teal);color:var(--teal-deep);background:var(--teal-tint-2);}
.mission-path button[data-done="true"]{background:var(--teal);color:var(--white);border-color:var(--teal);}
.mission-path button:disabled{opacity:.38;cursor:not-allowed;}
.lab-tabs{display:flex;gap:24px;padding:0 20px;border-bottom:1px solid var(--line);}
.lab-tabs button{position:relative;min-height:46px;padding:0 2px;border:0;background:transparent;font:inherit;font-size:13px;color:var(--muted);cursor:pointer;}
.lab-tabs button[aria-selected="true"]{color:var(--teal-deep);font-weight:600;}
.lab-tabs button[aria-selected="true"]::after{content:'';position:absolute;inset-inline:0;bottom:-1px;height:2px;background:var(--teal);}
.lab-instruction-scroll{min-height:0;flex:1;overflow:auto;overscroll-behavior:contain;scrollbar-width:thin;scrollbar-gutter:stable;}
.lab-instruction-scroll>[role="tabpanel"]{padding:22px 20px;outline-offset:-3px;}
.lab-instruction-scroll h2{font-size:21px;line-height:1.8;font-weight:600;margin:0 0 15px;}
.lab-instruction-scroll p,.mission-task-text,.mission-io dd{font-size:13px;line-height:2.15;margin:0 0 15px;}
.lab-instruction-scroll code{direction:ltr;unicode-bidi:embed;font:12px/1.8 ui-monospace,Consolas,monospace;color:var(--teal-deep);background:var(--paper);padding:1px 4px;border-radius:2px;}
.lab-task-number,.lab-panel-kicker{color:var(--muted);font-size:11px!important;line-height:1.7!important;margin:0 0 6px!important;}
.mission-story{font-size:12px;margin:0 0 22px;padding-bottom:15px;border-bottom:1px solid var(--line);}
.mission-story summary,.mission-contract summary{cursor:pointer;color:var(--teal-deep);line-height:1.9;}
.mission-story p:first-of-type{margin-top:15px;}
.mission-story p:last-child{margin-bottom:0;}
.mission-context{color:var(--ink-soft);}
.mission-section-title{font-size:13px;font-weight:600;margin:22px 0 10px;}
.mission-task-text ul{padding-inline-start:19px;margin:8px 0 14px;}
.mission-task-text li{padding-inline-start:3px;margin:6px 0;}
.mission-task-text p:last-child{margin-bottom:0;}
.mission-io{margin:20px 0;border-block:1px solid var(--line);}
.mission-io>div{padding:12px 0;}
.mission-io>div+div{border-top:1px dashed var(--line);}
.mission-io dt{font-size:11px;color:var(--muted);margin-bottom:6px;}
.mission-io dd{margin:0;font-size:12px;}
.mission-contract{font-size:12px;border-bottom:1px solid var(--line);padding-bottom:14px;margin:18px 0;}
.mission-contract pre{direction:ltr;text-align:left;white-space:pre;overflow:auto;max-height:260px;background:var(--paper);border:1px solid var(--line);padding:12px;margin:12px 0 0;font:11px/1.9 ui-monospace,Consolas,monospace;}
.mission-contract p{margin-top:12px;}
.mission-task-actions{display:flex;align-items:center;justify-content:space-between;gap:14px;margin:18px 0;}
.lab-hint-button{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:38px;padding:7px 15px;border:1px solid var(--teal);border-radius:4px;background:transparent;color:var(--teal-deep);font:500 12px/1.5 ui-sans-serif,system-ui,sans-serif;cursor:pointer;}
.lab-hint-button svg{width:18px;height:18px;fill:none;stroke:currentColor;stroke-width:1.4;stroke-linecap:round;stroke-linejoin:round;}
.lab-hint-button:hover{background:var(--teal-tint-2);}
.lab-hint-button:disabled{opacity:.5;cursor:default;}
.mission-task-reward,.mission-hint-count{font:11px/1.5 ui-monospace,Consolas,monospace;color:var(--muted);}
.mission-hint-count{margin-inline:12px;}
.mission-hints [data-hints]{margin-top:22px;}
.mission-hints [data-hints] p{border-inline-start:2px solid var(--teal);padding-inline-start:12px;}
.mission-hints [data-hints] b{font:11px ui-monospace,Consolas,monospace;color:var(--teal);margin-inline-end:6px;}
.mission-guide-steps{padding-inline-start:20px;font-size:13px;line-height:2.2;}
.mission-guide-steps li{margin:10px 0;}
.mission-guide .quiet-link{display:inline-block;font-size:12px;margin-top:12px;}
.lab-task label{display:block;font-size:12px;line-height:1.9;margin:18px 0 8px;}
.lab-task textarea{box-sizing:border-box;width:100%;padding:10px;border:1px solid var(--line-strong);border-radius:3px;background:var(--white);color:var(--ink);font:inherit;font-size:13px;line-height:2;resize:vertical;}
.lab-feedback{margin-top:16px;border-inline-start:2px solid var(--teal);background:var(--teal-tint-2);padding:10px 12px;font-size:12px;line-height:2;}
.lab-feedback[data-error="true"]{border-color:var(--coral);background:var(--coral-tint);}
.lab-next{width:100%;margin-top:16px;min-height:40px;font-size:12px;}
.lab-next:disabled{opacity:.4;cursor:not-allowed;}
.lab-finish{margin-top:18px;border-top:1px solid var(--teal);padding-top:18px;}
.lab-finish h3{font-size:17px;line-height:1.8;margin:10px 0;}
.lab-finish a{font-size:12px;color:var(--teal-deep);}
.mission-seal{display:inline-grid;place-items:center;width:30px;height:30px;border:1px solid var(--teal);border-radius:50%;color:var(--teal);}
.mission-query{border-inline-start:2px solid var(--teal);padding:3px 13px;margin:20px 0;}
.mission-query>span{font-size:11px;color:var(--muted);}
.mission-query strong{display:block;text-align:right;font:18px/1.8 ui-monospace,Consolas,monospace;color:var(--teal-deep);margin:7px 0;}
.mission-query p{font-size:12px;margin:0;}
.mission-table{overflow:auto;max-height:360px;scrollbar-width:thin;border:1px solid var(--line);margin:22px 0;}
.mission-table table{border-collapse:collapse;width:100%;font-size:11px;}
.mission-table caption{text-align:right;padding:10px;font-size:10px;color:var(--muted);line-height:1.8;}
.mission-table thead{position:sticky;top:0;background:var(--paper);}
.mission-table th,.mission-table td{padding:8px 6px;white-space:nowrap;text-align:center;border-bottom:1px solid var(--line);}
.mission-table th{font-weight:500;}
.mission-table th small{display:block;font:9px/1.6 ui-monospace,Consolas,monospace;}
.mission-table td{font-family:ui-monospace,Consolas,monospace;}
/* A single editor toolbar; secondary commands live in the tools menu. */
.lab-editor-panel{position:relative;min-height:0;min-width:0;display:flex;flex-direction:column;border:1px solid var(--line-strong);border-radius:4px;background:#fbf9f0;overflow:clip;}
.lab-editor-toolbar{display:flex;align-items:center;flex-wrap:wrap;gap:10px;direction:ltr;min-height:54px;box-sizing:border-box;padding:9px 12px;border-bottom:1px solid var(--line);background:var(--white);}
.lab-file{display:inline-flex;align-items:center;gap:8px;margin-inline-end:auto;font:12px/1.5 ui-monospace,Consolas,monospace;color:var(--ink-soft);}
.lab-file-dot{width:5px;height:5px;border:1px solid var(--teal);border-radius:50%;}
.lab-actions{display:flex;align-items:center;gap:8px;direction:rtl;}
.lab-actions button{font:inherit;font-size:12px;min-height:36px;padding:6px 13px;border-radius:3px;cursor:pointer;}
.lab-run-button{display:inline-flex;align-items:center;justify-content:center;gap:7px;border:1px solid var(--line-strong);background:transparent;color:var(--ink);}
.lab-run-button svg{width:14px;height:14px;fill:var(--teal);stroke:none;}
.lab-run-button:hover{background:var(--paper);}
.lab-tool-button{display:inline-flex;align-items:center;justify-content:center;gap:6px;min-height:36px;padding:6px 8px;border:0;border-radius:3px;background:transparent;color:var(--ink-soft);font:inherit;font-size:11px;cursor:pointer;}
.lab-tool-button:hover{background:var(--paper);}
.lab-tool-button svg,.lab-tools summary svg,.lab-console-head button svg{width:18px;height:18px;fill:none;stroke:currentColor;stroke-width:1.4;stroke-linecap:round;stroke-linejoin:round;}
.lab-tools{position:relative;direction:rtl;font-size:12px;}
.lab-tools>summary{position:relative;display:flex;align-items:center;justify-content:center;width:34px;height:36px;border-radius:3px;cursor:pointer;list-style:none;}
.lab-tools>summary::-webkit-details-marker{display:none;}
.lab-tools>summary:hover,.lab-tools[open]>summary{background:var(--paper);}
.lab-tools-menu{position:absolute;top:calc(100% + 7px);right:0;z-index:12;width:235px;max-width:calc(100vw - 48px);padding:9px;background:var(--white);border:1px solid var(--line-strong);border-radius:4px;box-shadow:0 7px 16px #24241f12;}
.lab-tools-menu p{font-size:11px;line-height:1.9;color:var(--muted);padding:4px 8px 12px;margin:0 0 5px;border-bottom:1px solid var(--line);}
.lab-tools-menu button{display:block;width:100%;min-height:37px;padding:7px 8px;text-align:right;background:transparent;border:0;border-radius:2px;color:var(--ink);font:inherit;font-size:12px;cursor:pointer;}
.lab-tools-menu button:hover{background:var(--paper);}
.lab-save-alert{position:absolute;top:0;right:0;background:var(--coral);color:var(--white);border-radius:50%;width:13px;height:13px;text-align:center;font:10px/13px ui-sans-serif,sans-serif;}
.lab-editor-panel button:disabled{opacity:.45;cursor:not-allowed;}
/* The split itself owns the available height, independent of lesson copy. */
.lab-split-area{--editor-share:72fr;--console-share:28fr;display:grid;grid-template-rows:minmax(0,var(--editor-share)) 12px minmax(0,var(--console-share));flex:1;min-height:360px;overflow:hidden;}
.lab-code-wrap{grid-row:1;display:grid;grid-template-columns:43px minmax(0,1fr);direction:ltr;min-height:0;background:#fbf9f0;}
.lab-lines{box-sizing:border-box;margin:0;padding:18px 8px;overflow:hidden;text-align:right;user-select:none;color:#6c6e60;background:#f1ecdf;border-right:1px solid var(--line);}
.lab-code{position:relative;min-width:0;min-height:0;overflow:hidden;}
.lab-code pre,.lab-code textarea,.lab-lines{font:14px/25px ui-monospace,SFMono-Regular,Consolas,monospace;tab-size:4;box-sizing:border-box;}
.lab-code pre,.lab-code textarea{position:absolute;inset:0;margin:0;padding:18px 16px;border:0;width:100%;height:100%;white-space:pre;overflow:auto;word-wrap:normal;letter-spacing:normal;}
.lab-code pre{pointer-events:none;color:var(--ink);scrollbar-width:none;}
.lab-code textarea{background:transparent!important;color:transparent!important;caret-color:var(--teal-deep);resize:none;border-radius:0;outline-offset:-3px;}
.lab-code textarea::selection{color:transparent;background:#d9ce9b80;}
.syn-comment{color:#6c725f;}.syn-keyword{color:#78401e;}.syn-string{color:#21665d;}.syn-number{color:#755822;}
.lab-resizer{grid-row:2;display:flex;align-items:center;justify-content:center;position:relative;z-index:2;min-height:12px;cursor:row-resize;touch-action:none;background:var(--paper);border-block:1px solid var(--line-strong);outline-offset:-2px;}
.lab-resizer span{display:block;width:36px;height:2px;background:var(--muted);border-radius:1px;}
.lab-resizer:hover,.lab-resizer:focus-visible,.is-resizing .lab-resizer{background:var(--teal-tint);}
.is-resizing,.is-resizing *{cursor:row-resize!important;user-select:none!important;}
.lab-console{grid-row:3;display:flex;flex-direction:column;min-height:0;background:#292c25;color:#f5f0df;}
.lab-console-head{display:flex;align-items:center;justify-content:space-between;gap:12px;min-height:36px;box-sizing:border-box;padding:4px 12px;direction:ltr;border-bottom:1px solid #4a5041;flex-shrink:0;}
.lab-console-title{font:10px/1.6 ui-monospace,Consolas,monospace;letter-spacing:1px;}
.lab-console-title>span{color:#c2c7b7;font-size:9px;letter-spacing:0;margin-left:12px;}
.lab-console-head>div{display:flex;align-items:center;gap:7px;}
.lab-console-head button{display:grid;place-items:center;width:30px;height:28px;padding:3px;background:transparent;color:#e6eadc;border:0;border-radius:2px;cursor:pointer;}
.lab-console-head button:hover{background:#454a3e;}
.lab-console-body{display:flex;flex-direction:column;min-height:0;flex:1;}
.lab-output{min-height:0;flex:1;box-sizing:border-box;margin:0;padding:12px 16px;overflow:auto;white-space:pre-wrap;overflow-wrap:anywhere;font:12px/1.8 ui-monospace,Consolas,monospace;}
.lab-repl{flex-shrink:0;border-top:1px solid #4a5041;direction:rtl;font-size:10px;}
.lab-repl summary{cursor:pointer;padding:7px 12px;color:#d0d6c4;}
.lab-console-form{display:flex;align-items:center;gap:8px;direction:ltr;padding:6px 12px 10px;}
.lab-console-form input{width:100%;min-width:0;background:transparent;color:#faf6e8;border:0;padding:5px;font:12px/1.6 ui-monospace,Consolas,monospace;}
.lab-console-form button{border:1px solid #9ba48e;color:#f5f0df;background:transparent;border-radius:2px;font:inherit;font-size:11px;padding:5px 10px;}
.lab-split-area.is-console-collapsed{grid-template-rows:minmax(0,1fr) 0 36px;}
.is-console-collapsed [data-console-toggle] svg{transform:rotate(180deg);}
.lab-runtime{margin:0;padding:8px 14px;border-top:1px solid var(--line);font-size:11px;line-height:1.9;background:var(--white);}
.mission-award{padding:9px 14px;border-top:1px solid var(--line);font:12px/1.5 ui-sans-serif,sans-serif;color:var(--teal-deep);}
.lab-workspace.is-focused{grid-template-columns:minmax(0,1fr);}
/* Compact XP, printed on the same paper rather than a separate glossy card. */
.mission-xp{--xp-to:100;--xp-accent:var(--teal);display:flex;align-items:center;gap:14px;flex:0 0 auto;direction:ltr;text-align:left;color:var(--teal-deep);font-family:ui-sans-serif,system-ui,sans-serif;}
.mission-xp-orbit{position:relative;flex:0 0 76px;width:76px;height:76px;}
.mission-xp .xp-ring-disc{fill:var(--paper);stroke:var(--line);}
.mission-xp .xp-ring-track{stroke:#c9c4ae;}
.mission-xp .xp-ring-track,.mission-xp .xp-ring-fill{stroke-width:6;}
.mission-xp .xp-ring-fill{transition:stroke-dashoffset .65s ease;}
.mission-xp-core{position:absolute;inset:12px;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:4px;}
.mission-xp-value{font:500 23px/1.1 ui-monospace,Consolas,monospace;letter-spacing:-1px;font-variant-numeric:tabular-nums;}
.mission-xp-limit{font-size:8px;line-height:1.3;white-space:nowrap;color:var(--muted);}
.mission-xp-copy{display:flex;flex-direction:column;align-items:flex-start;gap:4px;}
.mission-xp-eyebrow{font:9px/1.4 ui-monospace,Consolas,monospace;letter-spacing:1px;color:var(--muted);}
.mission-xp-count{margin:0;font-size:11px;line-height:1.6;color:var(--ink-soft);font-variant-numeric:tabular-nums;}
.mission-xp-percent{font-size:10px;color:var(--teal-deep);}
.mission-xp.is-complete{--xp-accent:#87671e;}
/* The dashboard shares this stylesheet; preserve its existing presentation. */
.xp-dashboard{margin:35px 0;background:var(--white);border:1px solid var(--line-strong);padding:28px;}.xp-dashboard-head{display:flex;justify-content:space-between;align-items:start;gap:20px;}.xp-dashboard h2{font-size:27px;margin:0 0 8px;}.xp-dashboard p{font-size:13px;line-height:2;margin:0;}.xp-dashboard-total{font:30px ui-monospace,Consolas,monospace;color:var(--teal-deep);white-space:nowrap;}.xp-dashboard-total small{font-size:14px;}.xp-dashboard progress{width:100%;height:10px;accent-color:var(--teal);display:block;margin:22px 0 12px;}.xp-dashboard-path{display:flex;gap:7px;margin-top:15px;}.xp-dashboard-path span{flex:1;padding:8px 2px;border:1px solid var(--line);text-align:center;font-size:12px;background:var(--paper);}.xp-dashboard-path [data-earned="true"]{background:var(--teal-tint);color:var(--teal-deep);border-color:var(--teal);}.xp-dashboard .portal-actions{margin-top:20px;}.xp-badge{display:inline-block;border:1px solid var(--teal);padding:6px 12px;background:var(--teal-tint);font-size:12px;margin-top:15px;}.xp-dashboard .xp-caption{font-size:11px;color:var(--muted);margin-top:10px;}
/* A quiet, cumulative XP celebration. The native dialog manages focus/inertness. */
.xp-celebration{--xp-from:100;--xp-to:100;--xp-turn-from:0deg;--xp-turn-to:0deg;--xp-accent:#21665d;position:fixed;inset:0;width:min(360px,calc(100vw - 24px));max-height:calc(100dvh - 24px);box-sizing:border-box;margin:auto;padding:42px 28px 30px;border:1px solid var(--line-strong);border-radius:6px;background:var(--paper);color:#193e36;box-shadow:0 12px 40px rgba(36,36,31,.16);overflow:auto;text-align:center;font-family:ui-sans-serif,system-ui,-apple-system,"Segoe UI",sans-serif;}
.xp-celebration[open]{display:grid;justify-items:center;}
.xp-celebration::backdrop{background:rgba(20,35,29,.29);backdrop-filter:blur(3px);-webkit-backdrop-filter:blur(3px);}
.xp-celebration.is-celebrating::backdrop{animation:xp-backdrop-in .22s ease-out both;}
.xp-celebration.is-complete{--xp-accent:#987122;}
.xp-orbit{position:relative;width:248px;max-width:100%;aspect-ratio:1;}
.xp-ring{display:block;width:100%;height:100%;overflow:visible;}
.xp-ring-disc{fill:#fffaf0;stroke:#f0eadb;stroke-width:1;}
.xp-ring-track,.xp-ring-fill{fill:none;stroke-width:7;transform:rotate(-90deg);transform-origin:120px 120px;}
.xp-ring-track{stroke:#d9dfce;}
.xp-ring-fill{stroke:var(--xp-accent);stroke-linecap:round;stroke-dasharray:100;stroke-dashoffset:var(--xp-to);}
.xp-ring-tip{position:absolute;inset:0;transform:rotate(var(--xp-turn-to));pointer-events:none;}
.xp-ring-tip i{position:absolute;left:50%;top:5%;width:9px;height:9px;transform:translate(-50%,-50%);border-radius:50%;background:var(--xp-accent);box-shadow:0 0 0 4px rgba(225,194,104,.24),0 0 13px rgba(225,194,104,.55);}
.xp-celebration-core{position:absolute;inset:34px;display:flex;flex-direction:column;align-items:center;justify-content:center;}
.xp-celebration-check{display:flex;align-items:center;justify-content:center;width:33px;height:33px;margin-bottom:10px;border-radius:50%;background:#e4eddf;color:#21665d;}
.xp-celebration.is-complete .xp-celebration-check{background:#f1e5c8;color:#87611b;}
.xp-celebration h2{display:flex;align-items:baseline;justify-content:center;gap:6px;margin:0;font:600 46px/1.12 ui-sans-serif,system-ui,sans-serif;letter-spacing:-2.3px;font-variant-numeric:tabular-nums;color:#193e36;white-space:nowrap;}
.xp-celebration-unit{font-size:20px;font-weight:500;letter-spacing:-.5px;}
.xp-celebration-label{margin-top:9px;font-size:12px;letter-spacing:.8px;color:#637568;}
.xp-celebration-message{margin:19px 0 0;font-size:21px;font-weight:600;line-height:1.4;letter-spacing:-.5px;color:#193e36;}
.xp-celebration-total{margin:8px 0 0;font-size:13px;font-weight:500;line-height:1.6;letter-spacing:.3px;font-variant-numeric:tabular-nums;color:#52675a;}
.xp-celebration-divider{opacity:.65;}
.xp-celebration-continue{display:inline-flex;align-items:center;justify-content:center;gap:14px;min-width:168px;min-height:46px;margin-top:23px;padding:11px 22px;border:1px solid rgba(255,250,240,.45);border-radius:3px;background:#194d40;color:#fffaf0;font:500 13px/1.5 ui-sans-serif,system-ui,sans-serif;cursor:pointer;transition:background .18s ease,transform .18s ease;}
.xp-celebration-continue:hover{background:#123d32;transform:translateY(-1px);}
.xp-celebration-close{position:absolute;top:8px;right:8px;display:flex;align-items:center;justify-content:center;width:36px;height:36px;border:0;border-radius:50%;background:transparent;color:#37594a;cursor:pointer;}
.xp-celebration-close:hover{background:#fffaf0;}
.xp-celebration-continue:focus-visible,.xp-celebration-close:focus-visible{outline:3px solid #e9cf88;outline-offset:4px;}
.xp-spark{position:absolute;display:block;width:5px;height:5px;background:#d9b467;border-radius:50%;opacity:0;pointer-events:none;}
.xp-spark-one{left:6%;top:18%;--spark-x:-9px;--spark-y:-12px;}
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body.lab-notebook-ready .shell{width:100%;max-width:none;}
body.lab-notebook-ready .portal-header,body.lab-notebook-ready .route-trail,body.lab-notebook-ready .portal-footer{display:none;}
body.lab-notebook-ready .portal-main{padding:0;}
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.lab-open-notebook .lab-tabs::before{content:'';position:absolute;left:12px;top:14px;width:10px;height:210px;background:var(--lab-rail);}
.lab-open-notebook .lab-tabs::after{content:'';position:absolute;left:52px;right:34px;bottom:0;height:1px;background:#b8b29d;}
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 .lab-open-notebook .mission-xp-limit{font-size:12px;}
 .lab-open-notebook .mission-xp-count{font-size:10px;}
 .lab-site-links{gap:18px;}
 .lab-site-links a{font-size:13px;}
 .lab-mission-heading{padding-left:20px;gap:18px;}
 .lab-open-notebook .lab-top h1{font-size:20px;}
 .lab-open-notebook .lab-tabs{padding-left:35px;padding-right:24px;}
 .lab-open-notebook .lab-tabs::after{left:35px;right:24px;}
 .lab-open-notebook .lab-tabs button{font-size:17px;}
 .lab-open-notebook .lab-instruction-scroll>[role="tabpanel"]{padding-inline:36px;}
 .lab-open-notebook .lab-tabs::before{left:8px;width:7px;}
 .lab-open-notebook .lab-editor-toolbar{gap:18px;}
 .lab-open-notebook .lab-code pre,.lab-open-notebook .lab-code textarea{padding-inline:24px;}
 .lab-open-notebook .lab-hint-button{font-size:18px;min-height:48px;}
 .lab-open-notebook .mission-task-reward{font-size:15px;padding-left:18px;}
 .lab-open-notebook .mission-io>div{padding-left:48px;}
 .lab-open-notebook .mission-io>div::before{width:30px;height:30px;font-size:17px;}
}
@media(max-width:1000px){
 .lab-open-notebook .lab-top{height:auto;min-height:146px;grid-template-columns:160px 220px minmax(0,1fr);grid-template-rows:72px 64px;padding-inline:24px;}
 .lab-open-notebook .mission-xp{grid-column:2;grid-row:1;}
 .lab-site-links{grid-column:3;grid-row:1;}
 .lab-mission-heading{grid-column:1 / -1;grid-row:2;width:100%;height:64px;border:0;padding:0;gap:32px;}
 .lab-open-notebook .lab-workspace{height:max(640px,calc(100dvh - 146px));}
 .lab-open-notebook .mission-navigation{max-width:480px;margin-left:auto;}
}
@media(max-width:860px){
 .lab-open-notebook .lab-workspace{height:auto;grid-template-columns:minmax(0,1fr);}
 .lab-open-notebook .lab-instructions{border-bottom:1px solid var(--line);}
 .lab-open-notebook .lab-instruction-scroll{max-height:520px;}
 .lab-open-notebook .lab-editor-panel{height:720px;}
 .lab-open-notebook .lab-workspace.is-focused .lab-editor-panel{height:max(620px,calc(100dvh - 146px));}
 .lab-open-notebook .lab-instruction-scroll h2{font-size:30px;}
 .lab-open-notebook .lab-tabs::before{height:170px;}
 .lab-open-notebook .lab-code pre,.lab-open-notebook .lab-code textarea,.lab-open-notebook .lab-lines{font-size:17px;line-height:30px;}
 .lab-open-notebook .lab-code-wrap{grid-template-columns:52px minmax(0,1fr);}
}
@media(max-width:600px){
 .lab-open-notebook .lab-top{padding:8px 18px 12px;grid-template-columns:minmax(120px,1fr) minmax(160px,1fr);grid-template-rows:70px 40px 54px;}
 .lab-wordmark{grid-column:1;grid-row:1;font-size:22px;}
 .lab-open-notebook .mission-xp{grid-column:2;grid-row:1;padding-left:12px;gap:10px;justify-self:end;}
 .lab-open-notebook .mission-xp-orbit{width:52px;height:52px;flex-basis:52px;}
 .lab-open-notebook .mission-xp-value{font-size:19px;}
 .lab-site-links{grid-column:1 / -1;grid-row:2;gap:30px;}
 .lab-mission-heading{grid-row:3;gap:20px;}
 .lab-open-notebook .lab-top h1{font-size:18px;}
 .lab-open-notebook .mission-navigation{max-width:none;}
 .lab-open-notebook .mission-path button{width:17px;height:17px;min-width:17px;font-size:10px;}
 .lab-open-notebook .lab-tabs{min-height:68px;padding-inline:24px;}
 .lab-open-notebook .lab-tabs::after{left:24px;right:24px;}
 .lab-open-notebook .lab-tabs button{font-size:16px;min-height:54px;}
 .lab-open-notebook .lab-instruction-scroll>[role="tabpanel"]{padding:24px;}
 .lab-open-notebook .lab-instruction-scroll h2{font-size:27px;}
 .lab-open-notebook .lab-instruction-scroll p,.lab-open-notebook .mission-task-text{font-size:16px;}
 .lab-open-notebook .mission-io dt{font-size:15px;}
 .lab-open-notebook .mission-io dd{font-size:14px;}
 .lab-open-notebook .lab-hint-button{min-height:46px;font-size:17px;}
 .lab-open-notebook .mission-task-reward{font-size:14px;}
 .lab-open-notebook .lab-editor-toolbar{padding:10px 14px;min-height:65px;gap:12px;}
 .lab-open-notebook .lab-file{padding:10px 12px;font-size:15px;gap:9px;}
 .lab-open-notebook .lab-editor-panel{border-left-width:7px;}
 .lab-open-notebook .lab-code-wrap{grid-template-columns:38px minmax(0,1fr);}
 .lab-open-notebook .lab-code pre,.lab-open-notebook .lab-code textarea{padding:18px 14px;}
 .lab-open-notebook .lab-lines{padding:18px 6px;}
 .lab-open-notebook .lab-console-head{margin-inline:18px;}
 .lab-open-notebook .lab-console-title{font-size:16px;margin-left:36px;}
 .lab-open-notebook .lab-output{padding-inline:18px;font-size:14px;}
 .lab-open-notebook .lab-repl>summary{left:16px;}
 .lab-open-notebook .lab-console-form{padding-inline:18px;}
}
@media(prefers-reduced-motion:reduce){.lab-open-notebook .mission-xp .xp-ring-fill{transition:none;}}
@media(forced-colors:active){
 .lab-open-notebook .lab-console{color:CanvasText;background:Canvas;}
 .lab-open-notebook .lab-resizer span{background:Canvas;border-color:CanvasText;}
 .lab-open-notebook .lab-resizer span::after{background:CanvasText;}
 .lab-open-notebook .syn-keyword,.lab-open-notebook .syn-return,.lab-open-notebook .syn-string,.lab-open-notebook .syn-number,.lab-open-notebook .syn-comment,.lab-open-notebook .syn-builtin{color:CanvasText;}
}

/* Shared compact typography and a single scroll owner for each pane. */
.lab-wordmark strong{font-size:24px;}
.lab-open-notebook .lab-top h1{font-size:21px;}
.lab-site-links a{font-size:14px;}
.lab-open-notebook .lab-tabs{min-height:64px;padding-top:8px;}
.lab-open-notebook .lab-tabs button{font-size:14px;min-height:55px;}
.lab-open-notebook .lab-instruction-scroll{direction:ltr;scrollbar-gutter:stable;}
.lab-open-notebook .lab-instruction-scroll>[role="tabpanel"]{direction:rtl;text-align:right;padding:26px 36px 30px;}
.lab-open-notebook .lab-instruction-scroll h2{font-size:27px;line-height:1.65;margin:8px 0 20px;}
.lab-open-notebook .lab-instruction-scroll p,.lab-open-notebook .mission-task-text{font-size:16px;line-height:1.95;margin-bottom:16px;}
.lab-open-notebook .lab-task-number,.lab-open-notebook .lab-panel-kicker{font-size:12px!important;}
.lab-open-notebook .mission-action{margin:20px 0!important;}
.lab-open-notebook .mission-io{margin-top:24px;}
.lab-open-notebook .mission-io>div{padding:0 0 20px 44px;}
.lab-open-notebook .mission-io>div::before{width:28px;height:28px;font-size:14px;}
.lab-open-notebook .mission-io dt{font-size:16px;}
.lab-open-notebook .mission-io dd,.lab-open-notebook .mission-contract summary,.lab-open-notebook .mission-guide-steps{font-size:14px;}
.lab-open-notebook .mission-contract pre{font-size:12px;}
.lab-open-notebook .lab-hint-button{font-size:14px;min-height:40px;padding:7px 18px;width:min(220px,60%);}
.lab-open-notebook .lab-hint-button svg{width:18px;height:18px;}
.lab-open-notebook .mission-task-reward{font-size:12px;padding-left:16px;}
.lab-open-notebook .lab-editor-toolbar{min-height:62px;gap:10px;padding:10px 16px;flex-shrink:0;}
.lab-open-notebook .lab-file{font-size:13px;padding:10px;gap:8px;border-radius:4px 4px 0 0;}
.lab-open-notebook .lab-file svg{width:18px;height:18px;}
.lab-open-notebook .lab-file-dot{width:6px;height:6px;}
.lab-open-notebook .lab-editor-toolbar>.lab-actions{flex-shrink:0;gap:8px;direction:ltr;}
.lab-open-notebook .lab-actions button{font-size:12px;line-height:1.8;min-height:36px;padding:6px 12px;white-space:nowrap;direction:rtl;}
.lab-open-notebook .lab-actions [data-check]{background:var(--highlight,#f4d835);color:var(--ink);border:1px solid var(--ink);border-radius:2px;box-shadow:2px 2px 0 var(--ink);}
.lab-open-notebook .lab-actions [data-check]:hover:not(:disabled){background:#ffe857;}
.lab-open-notebook .lab-actions [data-check]:active:not(:disabled){box-shadow:1px 1px 0 var(--ink);}
.lab-open-notebook .lab-actions [data-check]:disabled{box-shadow:none;}
.lab-open-notebook .lab-code-wrap{grid-template-columns:44px minmax(0,1fr);min-width:0;overflow:hidden;}
.lab-open-notebook .lab-code pre,.lab-open-notebook .lab-code textarea,.lab-open-notebook .lab-lines{font-size:12px;line-height:22px;}
.lab-open-notebook .lab-code pre,.lab-open-notebook .lab-code textarea{padding:16px;}
.lab-open-notebook .lab-lines{padding:16px 9px;}
.lab-open-notebook .lab-code pre{overflow:hidden;scrollbar-width:none;}
.lab-open-notebook .lab-code pre::-webkit-scrollbar{display:none;width:0;height:0;}
.lab-open-notebook .lab-console-body{min-width:0;min-height:0;overflow:hidden;}
.lab-open-notebook .lab-console-head{min-height:48px;padding-block:8px;margin-inline:18px;}
.lab-open-notebook .lab-console-title{font-size:12px;margin-left:36px;}
.lab-open-notebook .lab-console-head>div{gap:12px;}
.lab-open-notebook .lab-repl>summary{top:12px;left:17px;}
.lab-open-notebook .lab-output{font-size:12px;line-height:22px;padding:18px;min-width:0;}
.lab-open-notebook .lab-console-form input{font-size:12px;}
.lab-open-notebook .lab-split-area.is-console-collapsed{grid-template-rows:minmax(0,1fr) 0 48px;}
.lab-open-notebook :is(.lab-instruction-scroll,.lab-code textarea,.lab-output,.mission-table,.mission-contract pre){scrollbar-width:thin;scrollbar-color:#8f927c66 transparent;overscroll-behavior:contain;}
.lab-open-notebook :is(.lab-instruction-scroll,.lab-code textarea,.lab-output,.mission-table,.mission-contract pre)::-webkit-scrollbar{width:6px;height:6px;}
.lab-open-notebook :is(.lab-instruction-scroll,.lab-code textarea,.lab-output,.mission-table,.mission-contract pre)::-webkit-scrollbar-track{background:transparent;}
.lab-open-notebook :is(.lab-instruction-scroll,.lab-code textarea,.lab-output,.mission-table,.mission-contract pre)::-webkit-scrollbar-thumb{background:#8f927c66;border-radius:8px;}
.lab-open-notebook :is(.lab-instruction-scroll,.lab-code textarea,.lab-output,.mission-table,.mission-contract pre)::-webkit-scrollbar-thumb:hover{background:#747964aa;}
.lab-open-notebook ::-webkit-scrollbar-corner{background:transparent;}
.lab-open-notebook .lab-output{scrollbar-color:#a6ae8c88 transparent;}
.lab-open-notebook .lab-output::-webkit-scrollbar-thumb{background:#a6ae8c88;}
.xp-dashboard-lab{padding-block:22px;border-top:1px solid var(--line);}
.xp-dashboard-lab h3{margin:0;font-size:18px;}
@media(min-width:861px) and (max-width:1250px),(max-width:600px){
 .lab-open-notebook .lab-editor-toolbar{flex-wrap:wrap;gap:8px;}
 .lab-open-notebook .lab-editor-toolbar>.lab-actions{order:4;flex-basis:100%;justify-content:flex-end;}
}
@media(max-width:600px){
 .lab-open-notebook .lab-instruction-scroll>[role="tabpanel"]{padding:22px;}
 .lab-open-notebook .lab-instruction-scroll h2{font-size:24px;}
 .lab-open-notebook .lab-editor-toolbar{padding:10px 12px;}
 .lab-open-notebook .lab-code-wrap{grid-template-columns:36px minmax(0,1fr);}
 .lab-open-notebook .lab-code pre,.lab-open-notebook .lab-code textarea{padding-inline:12px;}
 .lab-open-notebook .lab-lines{padding-inline:6px;}
}

/* Story first, quiet feedback, the same stock and ink as the coding workspace. */
.lab-open-notebook .lab-mission-heading{position:relative;column-gap:20px;}
.lab-heading-copy{flex-shrink:0;}
.lab-heading-copy .lab-story-review{font-size:11px;border:0;padding:0 2px;margin-top:2px;min-height:22px;}
.lab-story-review,.lab-last-feedback{font:12px/1.8 var(--font-body);color:var(--teal-deep);background:transparent;border:1px solid #aaa993;border-radius:2px;padding:5px 9px;cursor:pointer;white-space:nowrap;}
.lab-story-review:hover,.lab-last-feedback:hover{background:#f4d83522;}
.lab-open-notebook .lab-mission-heading .mission-navigation{min-width:0;}
.lab-open-notebook.is-lab-intro .mission-navigation{visibility:hidden;}
.lab-open-notebook .lab-intro[hidden],.lab-open-notebook .lab-workspace[hidden]{display:none!important;}
.lab-intro{box-sizing:border-box;max-width:1160px;margin:0 auto;padding:46px 42px 38px;display:grid;grid-template-columns:minmax(0,1.1fr) minmax(0,.9fr);gap:28px 50px;color:var(--ink);direction:rtl;}
.lab-intro-copy,.lab-intro-sample,.lab-intro-path{min-width:0;}
.lab-intro-kicker{font-size:12px;line-height:1.9;color:var(--muted);margin:0 0 10px;}
.lab-intro h2{font-size:30px;line-height:1.7;margin:0 0 20px;font-weight:600;}
.lab-intro h3{font-size:18px;line-height:1.8;font-weight:600;margin:0 0 12px;}
.lab-intro p:not(.lab-intro-kicker){font-size:16px;line-height:2;margin:0 0 15px;}
.lab-intro code,.lab-feedback-dialog code{font:12px/1.9 ui-monospace,Consolas,monospace;direction:ltr;unicode-bidi:isolate;background:#f7f3e5;padding:2px 5px;border:1px solid #c7c1ad;border-radius:2px;}
.lab-intro-dataset{margin-top:24px;}
.lab-intro-sample{align-self:start;margin-top:40px;padding:24px;border:1px solid #bcb49f;background:#ded5be url('lab-paper-grain.svg?v=b4d4c5bccbb7d6d6');}
.lab-intro-table{overflow:auto;scrollbar-width:thin;}
.lab-intro table{border-collapse:collapse;width:100%;font-size:14px;}
.lab-intro th,.lab-intro td{padding:11px 8px;border-bottom:1px solid #bcb49f;text-align:center;white-space:nowrap;}
.lab-intro th{font-weight:500;}
.lab-intro-query{margin-top:22px;}
.lab-intro-query>span{font-size:12px;color:var(--muted);}
.lab-intro-query strong{display:block;text-align:right;font:18px/1.9 ui-monospace,Consolas,monospace;margin:8px 0;color:var(--teal-deep);}
.lab-intro-path{grid-column:1 / -1;border-top:1px solid #bcb49f;padding-top:24px;}
.lab-intro-path ol{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px 30px;margin:18px 0 0;padding-inline-start:23px;font-size:14px;line-height:1.9;}
.lab-intro-path li{padding-inline-start:3px;}
.lab-intro-footer{grid-column:1 / -1;display:flex;align-items:center;justify-content:space-between;gap:20px;border-top:1px solid #bcb49f;padding-top:22px;}
.lab-intro-footer>span{font:12px/1.8 ui-monospace,Consolas,monospace;color:var(--muted);}
.lab-feedback-dialog{box-sizing:border-box;width:min(520px,calc(100vw - 32px));max-height:calc(100dvh - 40px);overflow:auto;margin:auto;padding:30px;border:1px solid var(--ink);border-radius:3px;background:#eee6d3 url('lab-paper-grain.svg?v=b4d4c5bccbb7d6d6');color:var(--ink);box-shadow:5px 6px 0 #292f2426;text-align:right;scrollbar-width:thin;scrollbar-color:#8f927c88 transparent;}
.lab-feedback-dialog::backdrop{background:#252b235c;}
.lab-feedback-dialog h2{font-size:23px;line-height:1.7;font-weight:600;margin:13px 0 12px;}
.lab-feedback-dialog p{font-size:16px;line-height:2;margin:0 0 16px;}
.lab-feedback-dialog .lab-feedback-step{font-size:12px;color:var(--muted);padding-left:26px;}
.lab-feedback-close{position:absolute;left:17px;top:12px;width:32px;height:32px;border:0;background:transparent;color:var(--ink);font:25px/1 system-ui;cursor:pointer;}
.lab-feedback-close:hover{background:#292f240b;}
.lab-feedback-symbol{display:grid;place-items:center;width:34px;height:34px;border:1px solid #9a7439;color:#805a21;background:#b88b3e0c;border-radius:50%;font:20px/1 ui-monospace,monospace;}
.lab-feedback-dialog[data-kind="service"] .lab-feedback-symbol{border-color:#8b8e80;color:#626b5d;background:transparent;}
.lab-feedback-dialog[data-kind="success"] .lab-feedback-symbol{border-color:var(--teal);color:var(--teal);}
.lab-feedback-hint,.lab-feedback-example{border-top:1px solid #c3bba5;padding-top:12px;margin-top:14px;}
.lab-feedback-dialog summary{font-size:14px;line-height:1.8;cursor:pointer;color:var(--teal-deep);}
.lab-feedback-hint summary{width:max-content;}
.lab-feedback-dialog details p{margin:12px 0;font-size:16px;}
.lab-feedback-dialog pre{font:12px/22px ui-monospace,Consolas,monospace;background:#f8f5e9;border:1px solid #cbc4b0;padding:14px;overflow:auto;max-height:220px;scrollbar-width:thin;text-align:left;}
.lab-feedback-dialog [data-feedback-return]{margin-top:24px;min-height:42px;font-size:14px;padding:8px 18px;}
.lab-feedback-dialog :focus-visible,.lab-intro :focus-visible,.lab-story-review:focus-visible,.lab-last-feedback:focus-visible{outline:2px solid var(--teal);outline-offset:4px;}
.lab-feedback-dialog #lab-feedback-title:focus,.lab-intro #lab-intro-title:focus{outline:none;}
@media(max-width:1250px){.lab-open-notebook .lab-editor-toolbar{flex-wrap:wrap;}.lab-open-notebook .lab-editor-toolbar>.lab-actions{order:4;flex-basis:100%;justify-content:flex-end;}}
@media(max-width:700px){.lab-intro{grid-template-columns:minmax(0,1fr);padding:28px 22px;gap:24px;}.lab-intro h2{font-size:25px;}.lab-intro-sample{margin-top:0;padding:18px;}.lab-intro-path ol{grid-template-columns:minmax(0,1fr);gap:8px;}.lab-intro-footer{align-items:flex-start;flex-direction:column;}.lab-feedback-dialog{padding:26px 22px;}.lab-feedback-dialog h2{font-size:21px;}}
@media(forced-colors:active){.lab-feedback-dialog,.lab-intro-sample{background:Canvas;color:CanvasText;border-color:CanvasText;}.lab-feedback-symbol{color:CanvasText;border-color:CanvasText;}}

.lab-feedback-dialog[open]{position:fixed;inset:0;height:max-content;z-index:99;}
.lab-open-notebook.has-feedback-fallback::after{content:'';position:fixed;inset:0;background:#252b235c;z-index:98;}

.lab-open-notebook .lab-message-cell{white-space:normal;min-width:160px;max-width:300px;text-align:right;overflow-wrap:anywhere;font:13px/1.9 var(--font-body);}
.lab-open-notebook .lab-message-text{margin:12px 0;padding:10px 12px;border-inline-start:2px solid var(--teal);background:#f7f3e544;font:16px/2 var(--font-body);overflow-wrap:anywhere;}
.lab-intro:has(.lab-message-cell){grid-template-columns:minmax(0,1fr);}
.lab-intro:has(.lab-message-cell) .lab-intro-sample{margin-top:0;}
@media(min-width:900px){.lab-intro:has(.lab-message-cell) .lab-intro-copy{display:grid;grid-template-columns:1fr 1fr;column-gap:36px;}.lab-intro:has(.lab-message-cell) .lab-intro-copy>.lab-intro-kicker,.lab-intro:has(.lab-message-cell) .lab-intro-copy>h2{grid-column:1 / -1;}.lab-intro:has(.lab-message-cell) .lab-intro-dataset{grid-column:2;grid-row:3 / span 3;margin-top:0;}}

/* Educational tutor: closed by default, paper drawer, no editor width changes. */
.lab-help-button { white-space:nowrap; display:inline-flex; align-items:center; min-height:34px; padding:5px 12px; border:1px solid var(--line-strong,#b7ad96); border-radius:2px; background:transparent; color:var(--ink,#302c25); font:inherit; font-size:12px; cursor:pointer; }
.lab-help-button:hover { background:var(--paper-deep,#e7dec9); }
.lab-tutor { position:fixed; inset:0 0 0 auto; box-sizing:border-box; width:min(440px,100%); max-width:100%; height:100dvh; max-height:100dvh; margin:0; padding:26px; overflow:auto; border:0; border-inline-end:1px solid var(--line-strong,#b7ad96); border-radius:0; background:var(--paper,#f4eddf); color:var(--ink,#302c25); font-family:var(--font-body); font-size:14px; line-height:2; box-shadow:-12px 0 50px #302c251a; scrollbar-width:thin; }
.lab-tutor:not([open]) { display:none; }
.lab-tutor::backdrop { background:#25221c66; }
.lab-tutor-head { display:flex; justify-content:space-between; align-items:flex-start; gap:16px; }
.lab-tutor-head h2 { font-size:21px; margin:0; }
.lab-tutor-eyebrow,.lab-tutor-source { font-size:11px; color:var(--muted,#6b6357); margin:0; }
.lab-tutor-close { width:36px; height:36px; flex-shrink:0; border:1px solid var(--line-strong,#b7ad96); background:transparent; color:inherit; font:inherit; font-size:24px; cursor:pointer; }
.lab-tutor-stage { border-block-end:1px solid var(--line,#d5cbb8); padding-bottom:16px; margin:14px 0 22px; }
.lab-tutor-form { display:grid; gap:10px; }
.lab-tutor-form label { font-size:13px; }
.lab-tutor-form label span,.lab-tutor-privacy { color:var(--muted,#6b6357); }
.lab-tutor-form select,.lab-tutor-form textarea { box-sizing:border-box; width:100%; padding:10px 12px; border:1px solid var(--line-strong,#b7ad96); border-radius:2px; background:#ffffff40; color:inherit; font:inherit; font-size:14px; line-height:1.9; }
.lab-tutor-form textarea { resize:vertical; min-height:100px; max-height:240px; }
.lab-tutor-consent { display:flex; gap:8px; align-items:flex-start; cursor:pointer; }
.lab-tutor-consent input { margin-top:7px; accent-color:var(--ink,#302c25); }
.lab-tutor-privacy { font-size:11px; line-height:1.9; margin:0 0 6px; }
.lab-tutor-send { width:100%; }
.lab-tutor-status { font-size:12px; margin:14px 0; }
.lab-tutor-answer { border-top:1px solid var(--line-strong,#b7ad96); padding-top:18px; }
.lab-tutor-answer h3 { font-size:17px; margin:8px 0; }
.lab-tutor-text,.lab-tutor-question { font-size:14px; margin:10px 0; }
.lab-tutor-question { padding-inline-start:12px; border-inline-start:2px solid var(--teal-deep,#52675e); }
@media (prefers-reduced-motion:no-preference) { .lab-tutor[open] { animation:tutor-enter .18s ease-out; } @keyframes tutor-enter { from { opacity:0; transform:translateX(20px); } to { opacity:1; transform:translateX(0); } } }

/* Conversational tutor v2: plain-text messages, same paper drawer. */
.lab-tutor-stage-row { display:flex; align-items:center; justify-content:space-between; gap:12px; border-bottom:1px solid var(--line,#d5cbb8); margin-bottom:18px; }
.lab-tutor-stage-row .lab-tutor-stage { border:0; margin:12px 0; padding:0; }
.lab-tutor-reset { flex-shrink:0; border:0; background:transparent; padding:8px 0; font:inherit; font-size:11px; color:var(--muted,#6b6357); text-decoration:underline; text-underline-offset:4px; cursor:pointer; }
.lab-tutor-thread { display:grid; gap:18px; margin-bottom:20px; }
.lab-tutor-message { padding:12px 14px; border:1px solid var(--line,#d5cbb8); border-radius:2px; background:#ffffff30; overflow-wrap:anywhere; }
.lab-tutor-message[data-role="assistant"] { border-inline-start:2px solid var(--teal-deep,#52675e); background:transparent; }
.lab-tutor-message-label { font-size:10px; color:var(--muted,#6b6357); margin:0 0 7px; }
.lab-tutor-message-text { font-size:14px; line-height:2.05; white-space:pre-wrap; margin:0; }
.lab-tutor-welcome { font-size:14px; line-height:2; }
.lab-tutor-prompts { display:flex; flex-wrap:wrap; gap:8px; margin:14px 0 22px; }
.lab-tutor-prompts button { background:transparent; border:1px solid var(--line-strong,#b7ad96); border-radius:2px; padding:6px 9px; font:inherit; font-size:11px; color:inherit; cursor:pointer; }
.lab-tutor-prompts button:hover { background:var(--paper-deep,#e7dec9); }

/* IDE-style assistant tab and shared horizontal panel splitter. */
.lab-open-notebook .lab-workspace { grid-template-columns:minmax(0,var(--lab-panel-share,41.85fr)) 8px minmax(0,var(--lab-code-share,58.15fr)); }
.lab-panel-resizer { min-width:8px; position:relative; cursor:col-resize; touch-action:none; background:var(--lab-paper); outline-offset:-2px; }
.lab-panel-resizer::after { content:''; position:absolute; width:2px; height:34px; inset:50% auto auto 3px; transform:translateY(-50%); border-radius:2px; background:#6c776680; }
.lab-panel-resizer:hover,.lab-panel-resizer:focus-visible,.is-panel-resizing .lab-panel-resizer { background:#aeb8a080; }
.is-panel-resizing,.is-panel-resizing * { cursor:col-resize!important; user-select:none!important; }
.lab-open-notebook .lab-workspace.is-focused { grid-template-columns:minmax(0,1fr); }
.lab-workspace.is-focused .lab-panel-resizer { display:none; }
.lab-open-notebook .lab-tabs { gap:clamp(12px,2vw,28px); padding-inline:20px; }
.lab-open-notebook .lab-instructions.is-tutor-active .lab-instruction-scroll { overflow:hidden; display:flex; flex-direction:column; max-height:none; scrollbar-gutter:auto; }
.lab-open-notebook .lab-instruction-scroll>#lab-panel-assistant { padding:0; min-height:0; flex:1; height:100%; overflow:hidden; }
.lab-open-notebook #lab-panel-assistant .lab-tutor-docked { position:static; inset:auto; width:100%; max-width:none; height:100%; max-height:none; min-height:0; margin:0; padding:0; border:0; border-radius:0; box-shadow:none; display:flex; flex-direction:column; overflow:hidden; background:transparent; animation:none; }
.lab-open-notebook #lab-panel-assistant .lab-tutor-docked[hidden] { display:none; }
.lab-open-notebook .lab-tutor-docked .lab-tutor-head { flex:0 0 auto; padding:14px 18px 0; }
.lab-open-notebook .lab-tutor-docked .lab-tutor-head h2 { font-size:17px; line-height:1.7; margin:2px 0 0; letter-spacing:0; }
.lab-open-notebook .lab-tutor-docked .lab-tutor-head .lab-tutor-eyebrow { font-size:10px; margin:0; }
.lab-tutor-docked .lab-tutor-close { width:28px; height:28px; font-size:20px; }
.lab-tutor-docked .lab-tutor-stage-row { flex:0 0 auto; margin:0 18px; }
.lab-open-notebook .lab-tutor-docked .lab-tutor-stage { font-size:12px; line-height:1.8; margin:8px 0; }
.lab-tutor-transcript { flex:1 1 0; min-height:0; overflow:auto; padding:18px; overscroll-behavior:contain; scrollbar-width:thin; scrollbar-color:#8f927c66 transparent; overflow-anchor:none; }
.lab-tutor-transcript::-webkit-scrollbar { width:5px; }
.lab-tutor-transcript::-webkit-scrollbar-thumb { background:#8f927c66; border-radius:5px; }
.lab-open-notebook .lab-tutor-docked .lab-tutor-message-label { font-size:10px; line-height:1.6; margin:0 0 6px; }
.lab-open-notebook .lab-tutor-docked .lab-tutor-message-text,.lab-open-notebook .lab-tutor-docked .lab-tutor-welcome { font-size:14px; line-height:1.95; margin:0; }
.lab-tutor-docked .lab-tutor-thread { gap:14px; margin:0; }
.lab-tutor-docked .lab-tutor-message { padding:10px 12px; }
.lab-tutor-composer { flex:0 0 auto; min-height:0; padding:12px 18px; border-top:1px solid var(--line-strong); background:var(--lab-paper); }
.lab-tutor-docked .lab-tutor-form { gap:7px; }
.lab-tutor-docked .lab-tutor-form>label[for] { position:absolute; width:1px; height:1px; overflow:hidden; clip-path:inset(50%); }
.lab-tutor-docked .lab-tutor-form textarea { min-height:62px; max-height:140px; height:76px; resize:vertical; font-size:13px; line-height:1.8; }
.lab-tutor-docked .lab-tutor-consent { font-size:11px; line-height:1.7; }
.lab-tutor-details { font-size:10px; color:var(--muted); }
.lab-tutor-details summary { cursor:pointer; }
.lab-open-notebook .lab-tutor-docked .lab-tutor-privacy { font-size:10px; line-height:1.8; margin:7px 0; max-height:88px; overflow:auto; }
.lab-tutor-docked .lab-tutor-send { min-height:34px; padding:6px 12px; font-size:12px; }
.lab-open-notebook .lab-tutor-docked .lab-tutor-status { font-size:11px; line-height:1.7; margin:7px 0 0; overflow-wrap:anywhere; }
.lab-tutor-status:empty { display:none; }
@media(max-width:860px) {
 .lab-open-notebook .lab-workspace { grid-template-columns:minmax(0,1fr); }
 .lab-panel-resizer { display:none; }
 .lab-open-notebook .lab-instructions.is-tutor-active { height:clamp(480px,78dvh,760px); }
}
@media(max-height:600px) and (min-width:861px) {
 .lab-tutor-docked .lab-tutor-head { display:none; }
 .lab-tutor-docked .lab-tutor-composer { padding-block:8px; }
}

/* Keep three or four tabs on one row, including narrow/resized panels. */
.lab-open-notebook .lab-tabs {
 display:flex;
 flex-wrap:nowrap;
 align-items:stretch;
 gap:clamp(4px,.7vw,10px);
 padding-inline:24px;
 min-width:0;
 overflow-x:auto;
 overflow-y:hidden;
 scrollbar-width:thin;
 scrollbar-color:#8f927c66 transparent;
}
.lab-open-notebook .lab-tabs button {
 flex:1 0 54px;
 min-width:54px;
 white-space:nowrap;
 padding-inline:2px;
 font-size:14px;
}
.lab-open-notebook .lab-tabs::after { left:24px; right:24px; }

/* Evaluation output is in the Data tab, not above the editor. */
.lab-evaluation-preview{margin-top:22px;padding-top:18px;border-top:1px solid var(--line,#c8bea5)}
.lab-evaluation-preview h3{font-size:18px;margin:0 0 12px}
.lab-evaluation-preview p{font-size:14px;line-height:1.9}
.lab-evaluation-chart{display:block;width:100%;height:auto;background:#f7f1df;border:1px solid #c8bea5}
.lab-evaluation-legend{display:flex;gap:12px;flex-wrap:wrap;color:#555c4c;font-size:12px;margin-block:12px}
.lab-evaluation-report{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:8px;margin-block:14px}
.lab-evaluation-report div{padding:10px 6px;background:#eee7d2;border:1px solid #c8bea5;text-align:center}
.lab-evaluation-report dt{font-size:11px;color:#555c4c}.lab-evaluation-report dd{margin:6px 0 0;font-size:19px;direction:ltr}
.lab-evaluation-matrix{width:100%;border-collapse:collapse;font-size:12px}.lab-evaluation-matrix td,.lab-evaluation-matrix th{padding:10px;border:1px solid #c8bea5;text-align:center}.lab-evaluation-matrix td{background:#e5ddef;color:#282037}
.lab-evaluation .mission-query{line-height:1.9}.lab-evaluation .mission-query strong{font-size:13px}

/* Fourth lab: compact local threshold control, using existing paper tokens. */
.threshold-slider-label{display:grid;gap:8px;font:12px var(--font-mono);direction:ltr;margin-block:16px}.threshold-slider-label output{color:var(--teal-deep)}.threshold-slider-label input{width:100%;accent-color:var(--teal-deep)}.lab-evaluation-preview [data-threshold-details]>svg{display:block;width:100%;max-width:350px;margin:16px auto}

.lab-thresholds .mission-query strong{font-size:13px;overflow-wrap:anywhere}