:root{color-scheme:dark;font:17px/1.7 system-ui;color:#e4e7ed;background:#090a0b;--muted:#a8b1bf;--blue:#a9c9f4}*{box-sizing:border-box}body{margin:0}header{padding:18px 5vw;border-bottom:1px solid #2a3038;display:flex;justify-content:space-between;align-items:center;gap:12px;position:sticky;top:0;background:#090a0bf5;z-index:2}a{color:var(--blue)}button,summary{cursor:pointer}button,textarea{font:inherit}button,.button{padding:10px 17px;border:1px solid #485b73;border-radius:8px;color:#d5e5fa;background:#172230;text-decoration:none;display:inline-block}button:focus-visible,a:focus-visible,summary:focus-visible,textarea:focus-visible{outline:3px solid #a9c9f4;outline-offset:4px}.quiet{background:#111315}.wrap{max-width:1170px;margin:auto;padding:48px 25px}h1{font-size:clamp(32px,5vw,52px);line-height:1.15;letter-spacing:-1.5px}h2{line-height:1.3}h3{line-height:1.4}.eyebrow{font-size:12px;letter-spacing:2px;text-transform:uppercase;color:var(--blue)}.muted,small{color:var(--muted)}.notice{border:1px solid #42566e;background:#111922;padding:13px 18px;border-radius:8px;margin-bottom:25px}.cards{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;margin:32px 0}.card{background:#111315;border:1px solid #30353d;padding:25px;border-radius:12px;display:flex;flex-direction:column}.card p{flex:1}.card h2{font-size:24px}.bar{height:5px;background:#2c333c;margin:20px 0}.bar span{display:block;background:#9dbfe5;height:100%}.layout{display:grid;grid-template-columns:270px minmax(0,1fr);gap:38px}aside details{border:1px solid #30353d;padding:14px;border-radius:8px;margin:9px 0;background:#111315}aside summary{font-size:14px}aside a{display:block;margin:9px 0;font-size:14px}article{max-width:760px}article p{margin:20px 0}.panel{padding:24px;background:#111315;border:1px solid #333c49;border-radius:10px;margin:28px 0}.trace{display:flex;gap:12px;align-items:center;flex-wrap:wrap}.trace span{border:1px solid #4c617c;border-radius:8px;padding:15px}label{display:block;margin:12px 0}textarea{display:block;min-height:180px;width:100%;padding:15px;background:#090a0b;border:1px solid #526277;border-radius:7px;color:#eee}code{background:#222a35;padding:2px 5px;border-radius:4px}details>summary{color:#bed4f1}.actions{display:flex;gap:12px;flex-wrap:wrap}.hidden{display:none}.status{color:#b5cfee}footer{margin-top:35px;padding-top:20px;border-top:1px solid #333}.module{border-bottom:1px solid #333;padding:13px 0}.module strong{color:#c9dcf6}.mobile-toggle{display:none}@media(max-width:800px){.cards{grid-template-columns:1fr}.layout{grid-template-columns:1fr}aside{display:none}aside.open{display:block}.mobile-toggle{display:block}.wrap{padding:26px 18px}header{padding:15px;font-size:14px}}

[hidden]{display:none!important}.badge{font-size:13px;color:#b6cbed}.course-progress{margin-top:auto}.skip{position:absolute;left:-9999px}.skip:focus{left:10px;top:10px;z-index:5;background:#101923;padding:12px}dialog{max-width:700px;width:calc(100% - 32px);background:#111315;color:#e4e7ed;border:1px solid #526277;border-radius:12px;padding:28px}dialog::backdrop{background:#000b}.error{color:#ffb2b2}.success{color:#b7dac3}.reader-toolbar{display:flex;justify-content:space-between;gap:12px;align-items:center;margin-bottom:20px}.notes-area{min-height:100px}.code-block{overflow:auto;white-space:pre;padding:20px;background:#0b0d11;border:1px solid #333;border-radius:8px;font:14px/1.7 ui-monospace,monospace}.source-links{padding-left:20px}pre code{padding:0;background:none}.answer-choice{padding:10px;border:1px solid #333;border-radius:7px}.question-card{scroll-margin-top:110px}.progress-line{font-size:13px;color:#b7c9e2}aside{align-self:start;position:sticky;top:100px;max-height:calc(100vh - 120px);overflow:auto}aside a[aria-current=page]{color:white;border-left:3px solid #a9c9f4;padding-left:10px}.workspace-page{max-width:1400px}.references-section{border-top:1px solid #333;margin-top:28px}.status-strip{max-width:1170px;margin:0 auto;padding:10px 25px;font-size:14px}.exercise-answer{min-height:320px}.module-complete{color:#abd8bd}.inline-quote{border-left:3px solid #7598c8;margin:20px 0;padding-left:18px}.steps li{margin:15px 0}.design-review-actions{margin-top:20px}.hero-copy{max-width:760px}@media(max-width:800px){aside{position:static;max-height:none}.reader-toolbar{align-items:flex-start;flex-wrap:wrap}}
.prediction{border-left:3px solid #789bc7}.worked-trace{margin-top:18px}.prediction details{padding:8px 0}.prediction h3{margin-top:0}

/* The design workspace keeps the drawing and its reasoning side by side. */
.design-page{max-width:1740px}.design-page .layout{grid-template-columns:235px minmax(0,1fr);gap:28px}.design-page article{max-width:none;min-width:0}.design-brief{margin:24px 0}.workspace-heading{display:flex;justify-content:space-between;align-items:center;gap:18px;margin:28px 0 18px}.workspace-heading h2{margin:4px 0}.layout-toggle{display:flex;border:1px solid #35475f;padding:3px;border-radius:9px;background:#0c1119}.layout-toggle button{font-size:13px;border-color:transparent;background:transparent;padding:7px 12px}.layout-toggle button[aria-pressed=true]{background:#1e3049;border-color:#385174}.work-grid{display:grid;grid-template-columns:minmax(0,1.3fr) minmax(290px,1fr);gap:16px}.work-grid.mode-diagram,.work-grid.mode-writing{grid-template-columns:1fr}.drawing-panel,.writing-panel{display:flex;flex-direction:column;min-width:0;border:1px solid #2d394a;border-radius:12px;background:#0d121b;overflow:hidden}.panel-heading{display:flex;justify-content:space-between;align-items:center;gap:12px;padding:16px 18px;border-bottom:1px solid #2b3543}.panel-heading h3{margin:0;font-size:16px}.panel-heading small{font-size:12px}.panel-heading button{font-size:13px;padding:7px 10px}.whiteboard{height:540px;min-height:400px;position:relative}.whiteboard .excalidraw,.whiteboard .excalidraw.theme--dark{--color-primary:#7aa9e9;--color-primary-darker:#a2c7ff;--color-primary-darkest:#bdd7ff;--color-primary-light:#233c5c;--color-primary-light-darker:#31527a;--color-primary-hover:#4f79af;--color-surface-high:#1b2536;--color-surface-low:#101722;--color-surface-mid:#152033;--color-primary-container:#203958;--color-on-surface:#d5dfed;--color-on-primary-container:#b9d5fa;--color-surface-primary-container:#17293f}.whiteboard .excalidraw button{font:inherit;padding:initial;border-radius:var(--border-radius-md)}.panel-bottom{margin-top:auto;padding:14px 18px;border-top:1px solid #263245;color:#9eacc0;font-size:12px;min-height:70px}.writing-panel textarea{border:0;border-radius:0;resize:vertical;min-height:540px;flex:1;background:#0c1119;color:#c4cedd;padding:20px;font-size:14px;line-height:1.85;outline-offset:-4px}.design-workspace>small{display:block;margin-top:12px}.design-review label{padding:12px 15px;border:1px solid #2b3647;border-radius:8px;background:#101722;display:flex;gap:12px;align-items:baseline}.design-review input{accent-color:#88b2ed}.sr-only{position:absolute;width:1px;height:1px;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap}.expanded-diagram{max-width:none;width:calc(100% - 24px);height:calc(100dvh - 24px);max-height:none;padding:14px;background:#080a0d}.expanded-toolbar{display:flex;justify-content:space-between;align-items:center;gap:12px;margin-bottom:12px}.expanded-toolbar h2{font-size:20px;margin:0}.expanded-diagram .whiteboard{height:calc(100dvh - 220px)}.expanded-diagram #expand-diagram{display:none}.review-dialog{max-width:1000px;max-height:90dvh;overflow:auto}.review-dialog img{display:block;max-width:100%;max-height:420px;object-fit:contain;margin:auto;background:#fff}.review-text{white-space:pre-wrap;overflow-wrap:anywhere;font:14px/1.7 system-ui;padding:18px;background:#0c1119;border:1px solid #35475f;border-radius:8px}.review-dialog .actions{position:sticky;bottom:-28px;background:#111315;padding:14px 0}.design-workspace button:disabled,.design-review input:disabled{opacity:.5;cursor:not-allowed}
@media(max-width:1200px){.work-grid{grid-template-columns:1fr}.writing-panel textarea{min-height:330px}.design-page .layout{grid-template-columns:220px minmax(0,1fr)}}
@media(max-width:800px){.design-page .layout{grid-template-columns:1fr}.workspace-heading{align-items:flex-start;flex-direction:column}.whiteboard{height:500px}.expanded-diagram{width:calc(100% - 10px);height:calc(100dvh - 10px);padding:8px}.expanded-diagram .whiteboard{height:calc(100dvh - 240px)}.panel-heading{padding:14px}}

.whiteboard .App-toolbar__extra-tools-trigger,.whiteboard .App-toolbar__extra-tools-dropdown,.whiteboard .default-sidebar-trigger,.whiteboard .excalidraw-hyperlinkContainer,.whiteboard button[aria-label="Create link"],.whiteboard button[aria-label="Edit link"],.whiteboard [data-testid="labels.link.create"],.whiteboard [data-testid="labels.link.edit"],.whiteboard [data-testid="labels.link.editEmbed"],.whiteboard [data-testid="labels.addToLibrary"],.whiteboard [data-testid="labels.convertToCode"]{display:none!important}

/* Course catalog: available lessons first, planned topics second. */
.catalog-heading{display:flex;align-items:baseline;justify-content:space-between;gap:18px;margin-top:44px}.catalog-heading h2{margin:0;font-size:24px}.catalog-intro{max-width:760px;margin:12px 0 0}.available-courses{grid-template-columns:repeat(2,minmax(0,1fr));margin-top:20px}.available-courses .card{max-width:none}.planned-courses{grid-template-columns:repeat(3,minmax(0,1fr));margin-top:22px}.planned-course{background:#0e1116;padding:22px}.planned-course h3{font-size:19px;margin:12px 0 0}.planned-course p{font-size:15px;line-height:1.7;margin:14px 0 0}.planned-course small{font-size:13px;margin-top:16px}.planned-course .eyebrow{color:#a8b1bf;font-size:11px}
@media(max-width:800px){.available-courses,.planned-courses{grid-template-columns:1fr}.catalog-heading{align-items:flex-start;flex-direction:column;gap:6px}.catalog-heading h2{font-size:23px}}

/* Compact site header: account status stays at the right edge. */
body>header{padding-block:8px;gap:12px}body>header #profile{margin-left:auto;min-height:44px;padding:6px 12px;font-size:13px;line-height:1.35;max-width:320px;overflow-wrap:anywhere}
@media(max-width:600px){body>header{padding:8px 16px;flex-wrap:wrap;gap:8px}body>header #profile{max-width:calc(100% - 116px);font-size:12px}}