:root{--substrate:#0f2a43;--substrate-deep:#0a1e31;--substrate-line:#1e3d5f;--paper:#f2f5f7;--paper-card:#ffffff;--ink:#1b2733;--ink-soft:#52657a;--copper:#c47a3d;--copper-deep:#a2632f;--pad:#e8b34b;--silk:#dce7f0;--silk-dim:#7fa0bc;--signal:#2d7dd2;--ok:#2e9e6b;--err:#c2453a;--mono:"IBM Plex Mono",ui-monospace,Menlo,monospace;--sans:"IBM Plex Sans",system-ui,sans-serif;--display:"Archivo","IBM Plex Sans",system-ui,sans-serif}*{box-sizing:border-box}body,html{margin:0;padding:0}body{font-family:var(--sans);color:var(--ink);background:var(--paper);line-height:1.6}a{color:inherit;text-decoration:none}img{max-width:100%}:focus-visible{outline:3px solid var(--pad);outline-offset:2px}@media (prefers-reduced-motion:reduce){*{animation:none!important;transition:none!important}}.wrap{max-width:1100px;margin:0 auto;padding:0 24px}.eyebrow{font-family:var(--mono);font-size:12px;letter-spacing:.14em;color:var(--copper);display:inline-flex;align-items:center;gap:10px}.eyebrow:before{content:"";width:10px;height:10px;border-radius:50%;background:var(--pad);border:2px solid var(--copper)}.dark .eyebrow{color:var(--pad)}.nav{background:var(--substrate);border-bottom:1px solid var(--substrate-line);position:-webkit-sticky;position:sticky;top:0;z-index:10}.nav-inner{gap:28px;height:58px}.nav-brand,.nav-inner{display:flex;align-items:center}.nav-brand{font-family:var(--mono);font-weight:600;font-size:14px;letter-spacing:.08em;color:var(--silk);gap:10px}.nav-brand .nav-mark{width:22px;height:22px;flex:none;display:block;border-radius:5px}.nav-links{display:flex;gap:22px;margin-left:auto}.nav-links a{font-family:var(--mono);font-size:12.5px;letter-spacing:.08em;color:var(--silk-dim);padding:6px 2px;border-bottom:2px solid transparent}.nav-links a.active,.nav-links a:hover{color:var(--silk);border-bottom-color:var(--copper)}@media (max-width:640px){.nav-inner{flex-wrap:wrap;height:auto;gap:2px 16px;padding-top:9px;padding-bottom:9px}.nav-links{margin-left:0;width:100%;gap:12px;justify-content:space-between}.nav-links a{font-size:11px;letter-spacing:.04em}}.hero{background:var(--substrate);color:var(--silk);padding:72px 0 0;overflow:hidden}.hero h1{font-family:var(--display);font-weight:800;font-size:clamp(38px,6vw,64px);line-height:1.04;letter-spacing:-.01em;margin:18px 0 20px;max-width:15ch}.hero h1 .accent{color:var(--pad)}.hero p.lede{max-width:56ch;font-size:18px;color:var(--silk-dim);margin:0 0 34px}.hero-cta{display:flex;gap:14px;margin-bottom:64px;flex-wrap:wrap}.btn{display:inline-block;font-family:var(--mono);font-size:13px;letter-spacing:.06em;padding:13px 22px;border-radius:8px;border:1px solid transparent;cursor:pointer}.btn-copper{background:var(--copper);color:#fff}.btn-copper:hover{background:var(--copper-deep)}.btn-ghost{border-color:var(--copper);color:var(--pad);background:transparent}.btn-ghost:hover{background:rgba(196,122,61,.12)}.board{background:var(--substrate-deep);border-top:1px solid var(--substrate-line);padding:56px 0 72px;color:var(--silk)}.board-title{margin-bottom:36px}.board-title h2{font-family:var(--display);font-weight:800;font-size:30px;margin:12px 0 6px}.board-title p{color:var(--silk-dim);margin:0;max-width:60ch}.trace-rail{position:relative;display:grid;grid-template-columns:repeat(3,1fr);grid-gap:22px;gap:22px}.trace-rail:before{content:"";position:absolute;top:34px;left:8%;right:8%;height:3px;background:var(--copper);border-radius:2px;z-index:0}.chip{position:relative;z-index:1;background:var(--substrate);border:1px solid var(--substrate-line);border-radius:12px;padding:22px 20px 20px;display:flex;flex-direction:column;gap:10px;transition:transform .15s ease,border-color .15s ease}.chip:hover{transform:translateY(-3px);border-color:var(--copper)}.chip .pin-row{display:flex;justify-content:space-between}.chip .pin-row span{width:8px;height:8px;border-radius:50%;background:var(--pad);border:2px solid var(--copper)}.chip .refdes{font-family:var(--mono);font-size:11.5px;letter-spacing:.14em;color:var(--pad)}.chip h3{font-family:var(--display);font-weight:700;font-size:21px;margin:2px 0}.chip .level{font-family:var(--mono);font-size:11px;letter-spacing:.08em}.chip .level,.chip p{color:var(--silk-dim)}.chip p{font-size:14.5px;margin:4px 0 0}.chip .go{margin-top:auto;padding-top:12px;font-family:var(--mono);font-size:12px;color:var(--pad);letter-spacing:.06em}.section{padding:64px 0}.section h2{font-family:var(--display);font-weight:800;font-size:30px;margin:12px 0 10px}.section p.sub{color:var(--ink-soft);max-width:62ch;margin:0 0 32px}.unit-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));grid-gap:18px;gap:18px}.unit{background:var(--paper-card);border:1px solid #dde4ea;border-left:4px solid var(--copper);border-radius:10px;padding:18px 20px}.unit .code{font-family:var(--mono);font-size:11px;letter-spacing:.12em;color:var(--copper)}.unit h3{font-family:var(--display);font-size:18px;font-weight:700;margin:6px 0 4px}.unit p{font-size:14px;margin:0 0 10px}.unit ol,.unit p{color:var(--ink-soft)}.unit ol{margin:0;padding-left:18px;font-size:13.5px}.unit ol li{margin:3px 0}.unit .soon{display:inline-block;margin-top:10px;font-family:var(--mono);font-size:10.5px;letter-spacing:.1em;color:var(--silk);background:var(--substrate);border-radius:4px;padding:3px 8px}.unit-live{display:block}.unit-live:hover{border-color:var(--copper);border-left-color:var(--pad)}.unit .open{margin-top:10px;font-size:10.5px;letter-spacing:.1em;color:#fff;background:var(--copper);border-radius:4px;padding:3px 8px}.crumb,.unit .open{display:inline-block;font-family:var(--mono)}.crumb{font-size:12px;letter-spacing:.08em;color:var(--silk-dim);margin-bottom:14px}.crumb:hover{color:var(--silk)}.lesson-index{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:10px}.lesson-index a{display:flex;align-items:baseline;gap:16px;background:var(--paper-card);border:1px solid #dde4ea;border-left:4px solid var(--copper);border-radius:10px;padding:15px 20px}.lesson-index a:hover{border-color:var(--copper)}.lesson-index .num{font-family:var(--mono);font-size:12px;letter-spacing:.1em;color:var(--copper)}.lesson-index .t{font-family:var(--display);font-weight:700;font-size:17px}.lesson-index .go{margin-left:auto;font-family:var(--mono);font-size:11px;color:var(--copper-deep);letter-spacing:.06em}.lesson-head{background:var(--substrate);color:var(--silk);padding:40px 0}.lesson-head h1{font-family:var(--display);font-weight:800;font-size:clamp(28px,4vw,40px);margin:0 0 20px}.lesson-objectives{background:var(--substrate-deep);border:1px solid var(--substrate-line);border-radius:10px;padding:16px 20px;max-width:720px}.silk-label{font-family:var(--mono);font-size:11px;letter-spacing:.14em;color:var(--pad)}.lesson-objectives ul{margin:10px 0 0;padding-left:18px}.lesson-objectives li{font-size:14.5px;color:var(--silk-dim);margin:4px 0}.lesson-body{max-width:780px}.lesson-p{font-size:16px;margin:18px 0}.lesson-code{font-family:var(--mono);font-size:.92em;color:var(--copper);overflow-wrap:break-word}.capstone .lesson-code,.dark .lesson-code{color:var(--pad)}.eq-chip{position:relative;width:-moz-fit-content;width:fit-content;max-width:100%;margin:26px auto;background:var(--substrate-deep);color:var(--silk);border:1px solid var(--substrate-line);border-radius:10px;padding:14px 32px;text-align:center}.eq-chip .eq-text{font-size:17px;display:block;max-width:100%;overflow-x:auto;overflow-y:hidden;padding:10px 4px;scrollbar-width:none;-ms-overflow-style:none}.eq-chip .eq-text::-webkit-scrollbar{display:none}.eq-chip .eq-row{display:flex;flex-wrap:wrap;justify-content:center;align-items:baseline;column-gap:36px;row-gap:12px}.eq-chip .eq-seg{flex:0 0 auto;max-width:100%}.eq-chip .fit-inner{display:block}.eq-chip .katex-display{margin:0}.eq-chip .eq-label{display:block;margin-top:8px;font-family:var(--mono);font-size:10.5px;letter-spacing:.14em;text-transform:uppercase;color:var(--silk-dim)}.eq-pin{position:absolute;width:8px;height:8px;border-radius:50%;background:var(--pad);border:2px solid var(--copper)}.eq-pin.tl{top:7px;left:7px}.eq-pin.tr{top:7px;right:7px}.eq-pin.bl{bottom:7px;left:7px}.eq-pin.br{bottom:7px;right:7px}.table-chip{position:relative;width:-moz-fit-content;width:fit-content;max-width:100%;margin:26px auto;background:var(--substrate-deep);color:var(--silk);border:1px solid var(--substrate-line);border-radius:10px;padding:14px 18px;text-align:center}.truth-table{border-collapse:collapse;margin:0 auto;font-family:var(--mono);font-size:13px;max-width:100%}.truth-table td,.truth-table th{padding:5px 10px;border-bottom:1px solid var(--substrate-line);text-align:center;white-space:normal;overflow-wrap:break-word}.truth-table th{color:var(--pad);font-size:11.5px;letter-spacing:.06em}.truth-table tbody tr:last-child td{border-bottom:none}@media (max-width:640px){.table-chip{padding:12px 8px}.truth-table{font-size:11px}.truth-table td,.truth-table th{padding:4px 5px}.truth-table th{font-size:10px}}.code-chip{position:relative;margin:26px 0;max-width:100%;background:var(--substrate-deep);color:var(--silk);border:1px solid var(--substrate-line);border-radius:10px;padding:18px 24px}.code-chip pre{margin:0;font-family:var(--mono);font-size:12.5px;line-height:1.55;white-space:pre-wrap;overflow-wrap:anywhere;word-break:break-word;-moz-tab-size:2;tab-size:2}.code-chip code{font:inherit;color:inherit}@media (max-width:640px){.code-chip{padding:14px 16px}.code-chip pre{font-size:11.5px}}.figure-chip{position:relative;margin:26px auto;max-width:640px;background:var(--substrate-deep);border:1px solid var(--substrate-line);border-radius:10px;padding:20px 28px;text-align:center}.figure-svg{display:block;width:100%;height:auto;margin:0 auto}.figure-caption{display:block;margin-top:10px;font-family:var(--mono);font-size:11px;letter-spacing:.06em;color:var(--silk-dim);text-align:center}.fig-stroke{stroke:var(--silk);stroke-width:2;fill:none;stroke-linecap:round;stroke-linejoin:round}.plot-svg{display:block;width:100%;height:auto;margin:0 auto}.plot-curve{stroke:var(--pad);stroke-width:2;fill:none;stroke-linecap:round;stroke-linejoin:round}.plot-curve-first{stroke:var(--silk);stroke-width:2;fill:none;stroke-linecap:round;stroke-linejoin:round}.plot-guide{stroke:var(--silk-dim);stroke-width:1.5;fill:none}.plot-legend-panel{fill:var(--substrate-deep);stroke:var(--substrate-line);stroke-width:1}.fig-fill{fill:var(--pad);stroke:none}.fig-label,.fig-text{fill:var(--silk);font-family:var(--mono)}.fig-value{fill:var(--pad);font-family:var(--mono)}.lesson-note{background:var(--paper-card);border:1px solid #dde4ea;border-left:4px solid var(--copper);border-radius:0 10px 10px 0;padding:14px 18px;margin:22px 0}.lesson-note .note-label{display:block;margin-bottom:6px;font-family:var(--mono);font-size:10.5px;letter-spacing:.14em;color:var(--copper)}.lesson-note p{margin:0;font-size:15px}.lesson-ul{list-style:none;margin:18px 0;padding:0}.lesson-ul li{position:relative;padding-left:22px;margin:8px 0}.lesson-ul li:before{content:"";position:absolute;left:0;top:.45em;width:8px;height:8px;border-radius:50%;background:var(--pad);border:2px solid var(--copper)}.example-chip{background:var(--paper-card);border:1px solid #dde4ea;border-radius:10px;padding:16px 20px;margin:24px 0}.example-chip .ex-label{font-family:var(--mono);font-size:10.5px;letter-spacing:.14em;color:var(--copper)}.example-chip h4{font-family:var(--display);font-weight:700;font-size:16px;margin:6px 0 8px}.example-chip ol{font-family:var(--mono);font-size:13px;margin:0 0 12px;padding-left:20px}.example-chip ol li{margin:6px 0}.ex-answer,.sol-answer{display:inline-block;font-weight:600;background:var(--pad);color:var(--ink);border-radius:6px;padding:7px 12px}.ex-answer,.silk-heading,.sol-answer{font-family:var(--mono);font-size:13px}.silk-heading{letter-spacing:.14em;color:var(--copper);margin:40px 0 12px}.practice-card{background:var(--paper-card);border:1px solid #dde4ea;border-radius:10px;padding:16px 20px;margin:14px 0}.practice-card .q-num{font-family:var(--mono);font-size:11px;letter-spacing:.12em;color:var(--copper)}.practice-card .q-prompt{margin:6px 0 12px;font-size:15.5px}.practice-toggle{font-family:var(--mono);font-size:11.5px;letter-spacing:.08em;padding:8px 14px;border-radius:6px;border:1px solid var(--copper);background:none;color:var(--copper-deep);cursor:pointer}.practice-toggle:hover{background:rgba(196,122,61,.12)}.practice-solution{margin-top:14px;border-top:1px dashed #dde4ea;padding-top:14px}.practice-solution ol{font-family:var(--mono);font-size:13px;margin:12px 0 0;padding-left:20px}.practice-solution ol li{margin:6px 0}.lesson-nav{display:flex;justify-content:space-between;align-items:baseline;gap:12px;margin-top:44px;border-top:1px solid #dde4ea;padding-top:20px}.lesson-nav a{font-family:var(--mono);font-size:12.5px;color:var(--copper-deep)}.lesson-nav a:hover{color:var(--copper)}.lesson-nav .up{color:var(--ink-soft)}.capstone{background:var(--substrate);color:var(--silk);border:1px solid var(--substrate-line);border-radius:12px;padding:22px 26px 26px;margin-top:36px}.capstone .pin-row{display:flex;justify-content:space-between;margin:2px 0 12px}.capstone .pin-row:last-child{margin:18px 0 0}.capstone .pin-row span{width:8px;height:8px;border-radius:50%;background:var(--pad);border:2px solid var(--copper)}.capstone .cap-label{font-family:var(--mono);font-size:11px;letter-spacing:.14em;color:var(--pad)}.capstone h3{font-family:var(--display);font-weight:800;font-size:24px;margin:8px 0 10px}.capstone p{color:var(--silk-dim);font-size:15px;margin:0 0 14px;max-width:70ch}.capstone ol{margin:0 0 18px;padding-left:20px}.capstone ol li{font-size:14.5px;color:var(--silk);margin:8px 0}.track-head{background:var(--substrate);color:var(--silk);padding:52px 0 44px}.track-head h1{font-family:var(--display);font-weight:800;font-size:clamp(30px,4.5vw,44px);margin:14px 0 10px}.track-head p{color:var(--silk-dim);max-width:60ch;margin:0}.track-head .meta{display:flex;gap:20px;margin-top:18px;flex-wrap:wrap}.track-head .meta span{font-family:var(--mono);font-size:12px;color:var(--pad);letter-spacing:.06em}.studio-bleed{max-width:none;margin:0;padding-left:24px;padding-right:24px}.studio{display:grid;grid-template-columns:520px minmax(0,1fr);grid-gap:20px;gap:20px;padding-top:28px;padding-bottom:64px}.studio-left{display:flex;flex-direction:column;gap:10px}.studio label{font-family:var(--mono);font-size:11px;letter-spacing:.1em;color:var(--ink-soft)}.studio textarea{width:100%;min-height:420px;resize:vertical;background:var(--substrate-deep);color:var(--silk);border:1px solid var(--substrate-line);border-radius:8px;font-family:var(--mono);font-size:12px;line-height:1.55;padding:12px}.studio-actions{display:flex;gap:10px}.studio-actions button{white-space:nowrap}.lbl-short,.studio-tabs{display:none}.status{font-family:var(--mono);font-size:12.5px;padding:10px 12px;border-radius:8px;border:1px solid #dde4ea;background:var(--paper-card);white-space:pre-wrap}.status.ok{border-color:var(--ok);color:var(--ok)}.status.err{border-color:var(--err);color:var(--err)}.explanation{background:var(--paper-card);border:1px solid #dde4ea;border-left:4px solid var(--copper);border-radius:8px;padding:12px 14px}.explanation-chip{display:inline-block;font-family:var(--mono);font-size:10.5px;letter-spacing:.14em;color:#fff;background:var(--copper);border-radius:4px;padding:3px 8px}.explanation p{font-family:var(--sans);font-size:14px;line-height:1.6;color:var(--ink);margin:10px 0 0}.schematic{background:var(--paper-card);border:1px solid #dde4ea;border-radius:10px;align-items:center;justify-content:center;overflow:hidden}.schematic,.viewer{min-height:70vh;display:flex}.viewer{flex-direction:column;width:100%;height:100%}.viewer-notice{font-family:var(--mono);font-size:11px;letter-spacing:.08em}.viewer-notice.info{color:var(--copper)}.viewer-notice.warn{color:var(--err)}.viewer-toolbar{display:flex;align-items:center;gap:8px;padding:8px 10px;border-bottom:1px solid #dde4ea}.viewer-toolbar button{font-family:var(--mono);font-size:13px;width:34px;height:30px;background:var(--substrate);color:var(--silk);border:0;border-radius:6px;cursor:pointer}.viewer-toolbar button:hover{background:var(--substrate-line)}.viewer-toolbar button:nth-of-type(3){width:auto;padding:0 12px;font-size:11px;letter-spacing:.08em}.viewer-hint{margin-left:auto;font-family:var(--mono);font-size:11px;color:var(--ink-soft)}.viewer-canvas{flex:1 1;overflow:hidden;cursor:-webkit-grab;cursor:grab;touch-action:none;position:relative;min-height:460px}.viewer-canvas:active{cursor:-webkit-grabbing;cursor:grabbing}.schematic .empty{font-family:var(--mono);font-size:13px;color:var(--ink-soft)}footer{background:var(--substrate);color:var(--silk-dim);padding:26px 0;border-top:1px solid var(--substrate-line);font-family:var(--mono);font-size:12px;letter-spacing:.05em}footer .wrap{display:flex;justify-content:space-between;flex-wrap:wrap;gap:10px}@media (max-width:900px){.trace-rail{grid-template-columns:1fr}.trace-rail:before{display:none}}@media (max-width:1080px){.studio{grid-template-columns:minmax(0,1fr)}.schematic,.viewer{min-height:60vh}}.design-name{width:100%;padding:10px 12px;background:var(--paper-card);color:var(--ink);border:1px solid #dde4ea;border-radius:8px;font-family:var(--mono);font-size:13px}.design-list{list-style:none;margin:0;padding:0;display:flex;flex-direction:column;gap:6px}.design-list li{display:flex;align-items:stretch;background:var(--paper-card);border:1px solid #dde4ea;border-radius:8px;overflow:hidden}.design-list li.active{border-color:var(--copper)}.design-open{flex:1 1;display:flex;justify-content:space-between;align-items:center;gap:10px;padding:10px 12px;background:none;border:0;cursor:pointer;font-family:var(--mono);font-size:12.5px;color:var(--ink);text-align:left}.design-open:hover{background:#eef2f5}.design-open span{color:var(--ink-soft);font-size:11px}.design-delete{width:36px;border:0;border-left:1px solid #dde4ea;background:none;color:var(--err);font-size:16px;cursor:pointer}.design-delete:hover{background:#fbeeec}.design-empty{padding:10px 12px;font-family:var(--mono);font-size:12px;color:var(--ink-soft);border:1px dashed #dde4ea!important;background:none!important}.ai-text{width:100%;resize:vertical;border-radius:8px}.studio textarea.ai-text{min-height:72px;font-family:var(--sans);font-size:13.5px;padding:10px 12px;background:var(--paper-card);color:var(--ink);border:1px solid #dde4ea}.design-name::placeholder,.studio textarea.ai-text::placeholder{color:var(--ink-soft)}.provider-select{flex:1 1;min-width:0;padding:10px 12px;background:var(--paper-card);color:var(--ink);border:1px solid #dde4ea;border-radius:8px;font-family:var(--mono);font-size:12px}.viewer-tabs{display:flex;gap:4px;margin-right:8px}.viewer-tabs .tab{width:auto!important;padding:0 12px!important;font-size:11px!important;letter-spacing:.08em;background:transparent!important;color:var(--ink-soft)!important;border:1px solid #dde4ea!important;border-radius:6px}.viewer-tabs .tab.active{background:var(--substrate)!important;color:var(--silk)!important;border-color:var(--substrate)!important}.palette{border:1px solid #dde4ea;border-radius:8px;background:var(--paper-card);padding:10px 12px}.palette>summary{cursor:pointer;-webkit-user-select:none;-moz-user-select:none;user-select:none;list-style-position:inside;font-family:var(--mono);font-size:11px;letter-spacing:.1em;color:var(--ink-soft)}.palette-note{font-family:var(--mono);font-size:12px;color:var(--err);margin-top:8px}.palette-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));grid-gap:6px;gap:6px;margin-top:10px}.palette-part{text-align:left;cursor:pointer;display:flex;flex-direction:column;gap:2px;border:1px solid #dde4ea;border-radius:6px;background:var(--paper);padding:6px 8px}.palette-part.active,.palette-part:hover:not(:disabled){border-color:var(--copper)}.palette-part.active{background:var(--paper-card)}.palette-part:disabled{opacity:.5;cursor:not-allowed}.palette-part strong{font-family:var(--mono);font-size:12px;color:var(--ink)}.palette-part span{font-size:11px;color:var(--ink-soft);line-height:1.35}.palette-form{border:1px solid var(--copper);border-radius:6px;background:var(--paper);padding:10px;margin-top:8px;display:flex;flex-direction:column;gap:8px}.pf-row{display:flex;align-items:center;gap:8px}.pf-row label{min-width:96px}.pf-row input,.pf-row select{flex:1 1;padding:6px 8px;font-family:var(--mono);font-size:12px;border:1px solid #dde4ea;border-radius:6px;background:var(--paper-card);color:var(--ink)}.pf-fixed{font-family:var(--mono);font-size:11px;color:var(--ink-soft)}.pf-fixed em{font-style:normal;color:var(--silk-dim)}.board-parts{list-style:none;margin:6px 0 0;padding:0;display:flex;flex-direction:column;gap:4px}.board-parts li{display:flex;align-items:center;gap:8px;border:1px solid #dde4ea;border-radius:6px;background:var(--paper-card);padding:4px 8px;font-family:var(--mono);font-size:12px}.board-parts .bp-refdes{color:var(--copper-deep);font-weight:600;min-width:42px}.board-parts .bp-part{color:var(--ink)}.board-parts .bp-pins{color:var(--ink-soft);margin-left:auto}.nav-account{display:flex;align-items:center;gap:14px;white-space:nowrap;font-family:var(--mono);font-size:12.5px;letter-spacing:.08em}.nav-account a{color:var(--silk-dim);padding:6px 2px;border-bottom:2px solid transparent}.nav-account a:hover{color:var(--silk);border-bottom-color:var(--copper)}.nav-user{color:var(--pad)}.nav-me{display:none;position:relative}.nav-me summary{list-style:none;cursor:pointer;color:var(--pad);padding:6px 4px;border-bottom:2px solid transparent}.nav-me summary::-webkit-details-marker{display:none}.nav-me[open] summary{border-bottom-color:var(--copper)}.nav-me-menu{position:absolute;right:0;top:calc(100% + 6px);z-index:11;display:flex;flex-direction:column;gap:8px;white-space:nowrap;background:var(--substrate-deep);border:1px solid var(--substrate-line);border-radius:8px;padding:10px 14px}.nav-me-menu .nav-user{font-size:11px;color:var(--silk-dim)}@media (max-width:640px){.nav-account{order:1;margin-left:auto;gap:10px;font-size:11px;letter-spacing:.04em}.nav-links{order:2}.nav-wide{display:none}.nav-me{display:block}}.progress-ctl{margin-top:36px;display:flex;align-items:center;gap:14px;flex-wrap:wrap}.progress-toggle{display:inline-flex;align-items:center;gap:10px;font-family:var(--mono);font-size:12.5px;letter-spacing:.08em;padding:11px 18px;border-radius:8px;border:1px solid var(--copper);background:var(--paper-card);color:var(--copper-deep);cursor:pointer}.progress-toggle .pad-dot{width:12px;height:12px;border-radius:50%;border:2px solid var(--copper);background:transparent}.progress-toggle.done{background:var(--copper);color:#fff;border-color:var(--copper)}.progress-toggle.done .pad-dot{background:var(--pad)}.progress-toggle:disabled{opacity:.6;cursor:wait}.progress-ctl.dark .progress-toggle{background:transparent;color:var(--pad)}.progress-ctl.dark .progress-toggle.done{background:var(--copper);color:#fff}.progress-note a,.progress-signin{font-family:var(--mono);font-size:12px;letter-spacing:.06em;color:var(--copper-deep)}.progress-ctl.dark .progress-signin{color:var(--pad)}.progress-note{font-family:var(--mono);font-size:12px;color:var(--err)}.lesson-index .lesson-dot{width:12px;height:12px;border-radius:50%;flex:none;align-self:center;border:2px solid var(--copper);background:transparent}.lesson-index .lesson-dot.done{background:var(--pad)}.progress-line{font-family:var(--mono);font-size:12px;letter-spacing:.06em;color:var(--pad)}.unit .progress-line{display:block;margin-top:10px;color:var(--copper-deep)}.capstone-actions{display:flex;align-items:center;gap:14px;flex-wrap:wrap}.capstone-actions .progress-ctl{margin-top:0}.status-signin{display:inline-block;margin-left:10px}.design-empty a,.status-signin{color:var(--copper-deep);letter-spacing:.06em}.design-empty a{font-family:var(--mono);font-size:11px}@media (max-width:999px){.studio-tabs{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));grid-gap:6px;gap:6px;padding:12px 24px 0}.studio-tab{display:flex;align-items:center;justify-content:center;gap:6px;min-height:44px;padding:0 6px;cursor:pointer;font-family:var(--mono);font-size:11.5px;letter-spacing:.08em;color:var(--ink-soft);background:var(--paper-card);border:1px solid #dde4ea;border-radius:8px}.studio-tab[aria-pressed=true]{background:var(--substrate);color:var(--silk);border-color:var(--substrate)}.tab-chip{font-size:9px;letter-spacing:.06em;text-transform:uppercase;color:var(--ink);background:var(--pad);border-radius:3px;padding:2px 4px}.studio-tab[aria-pressed=true] .tab-chip{color:var(--substrate)}.studio-main[data-tab=build] [data-panel]:not([data-panel=build]),.studio-main[data-tab=designs] [data-panel]:not([data-panel=designs]),.studio-main[data-tab=view] [data-panel]:not([data-panel=view]){display:none}.studio{padding-top:12px}.studio textarea{min-height:240px}.studio textarea.ai-text{min-height:96px}.studio-actions{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));grid-gap:10px;gap:10px}.studio-actions>*{min-height:44px}.studio-actions .provider-select{grid-column:1/-1}.lbl-long{display:none}.lbl-short{display:inline}.status{overflow-wrap:anywhere}.schematic,.viewer{min-height:65vh}.viewer-canvas{min-height:200px}.viewer-toolbar{flex-wrap:wrap;gap:6px}.viewer-toolbar button{width:44px;height:44px}.viewer-toolbar button:nth-of-type(3){width:auto;min-width:44px;padding:0 14px}.viewer-tabs{margin-right:0}.viewer-tabs .tab{min-height:44px;padding:0 14px!important}.viewer-hint{margin-left:0;width:100%}}.studio-strip{position:-webkit-sticky;position:sticky;top:59px;z-index:9;display:flex;align-items:center;gap:14px;padding:4px 24px;background:var(--substrate-deep);border-bottom:1px solid var(--substrate-line);font-family:var(--mono);font-size:11px;letter-spacing:.1em;color:var(--silk-dim)}.strip-title{display:flex;align-items:baseline;gap:8px;min-width:0;margin-right:auto;white-space:nowrap}.strip-label{flex:none;color:var(--pad)}.strip-sep{flex:none;color:var(--silk-dim)}.strip-name{min-width:0;overflow:hidden;text-overflow:ellipsis;color:var(--silk);letter-spacing:.04em}.strip-link{flex:none;white-space:nowrap;color:var(--silk-dim);padding:4px 2px;border-bottom:2px solid transparent;line-height:16px}.strip-link:hover{color:var(--silk);border-bottom-color:var(--copper)}.strip-toggle{flex:none;white-space:nowrap;cursor:pointer;font-family:var(--mono);font-size:11px;letter-spacing:.1em;padding:5px 12px;border-radius:6px;line-height:16px;background:transparent;color:var(--pad);border:1px solid var(--copper)}.strip-toggle:hover{background:rgba(196,122,61,.12)}.studio-main[data-mode=page] .strip-link{display:none}body:has(.studio-main[data-mode=app]){height:100vh;height:100dvh;display:flex;flex-direction:column;overflow:hidden}body:has(.studio-main[data-mode=app])>footer{display:none}.studio-main[data-mode=app]{flex:1 1;min-height:0;display:flex;flex-direction:column}.studio-main[data-mode=app]>.track-head{display:none}.studio-main[data-mode=app]>.studio{flex:1 1;min-height:0;overflow:hidden;grid-template-rows:minmax(0,1fr);padding-top:16px;padding-bottom:16px}.studio-main[data-mode=app] .studio-left{min-height:0;overflow-y:auto;margin:0 -6px;padding:0 6px 6px}.studio-main[data-mode=app] .schematic,.studio-main[data-mode=app] .viewer,.studio-main[data-mode=app] .viewer-canvas{min-height:0}@media (min-width:1000px) and (max-width:1080px){.studio-main[data-mode=app]>.studio{grid-template-rows:minmax(0,1fr) minmax(0,1fr)}}@media (max-width:999px){.studio-strip{gap:10px}.strip-link,.strip-toggle{display:inline-flex;align-items:center;min-height:44px}.studio-main[data-mode=app]>.studio{display:flex;flex-direction:column;padding-top:12px;padding-bottom:12px}.studio-main[data-mode=app] .studio-left{flex:1 1 auto}.studio-main[data-mode=app] .schematic{flex:1 1}.studio-main[data-mode=app][data-tab=view] .studio-left{flex:0 1 auto;max-height:40%}.studio-main[data-mode=app][data-tab=view] .studio-left:not(:has(>.explanation)){display:none}}@media (max-width:640px){.studio-strip{position:static}}