/* Original Codex field-guide design. See docs/design-research-2026-10-22.md. */
:root{color-scheme:light;--canvas:#f8f9fc;--surface:#fff;--ink:#202126;--muted:#666a77;--border:#e3e5ed;--soft:#f0f2f7;--tint:#edeffc;--accent:#4351d8;--accent-hover:#3340b5;--on-accent:#fff;--terminal:#eef0f6;--sans:Manrope,system-ui,sans-serif;--display:Fraunces,"Times New Roman",serif;--mono:'JetBrains Mono',monospace;--font-body:var(--sans);--font-display:var(--display);--font-mono:var(--mono);--green:var(--accent);--green-line:#d5daf3;--green-tint-03:var(--soft);--atelier-ink:var(--ink);--atelier-accent:var(--accent);--atelier-surface:var(--surface);--atelier-soft:var(--soft);--success:#326d52;--success-bg:#edf6f0;--header-height:76px;--bg:var(--canvas);--line:var(--border);--text:var(--ink);--text-dim:var(--muted)}
:root[data-theme=dark]{color-scheme:dark;--canvas:#15161b;--surface:#1e2027;--ink:#eff0f5;--muted:#a1a6b8;--border:#343744;--soft:#272a35;--tint:#2b2f4d;--accent:#a4aeff;--accent-hover:#bcc3ff;--on-accent:#1c2249;--terminal:#252936;--green-line:#414867;--success:#9bd0af;--success-bg:#24382d}
*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:108px}body{margin:0;background:var(--canvas);color:var(--ink);font:16px/1.65 var(--sans);-webkit-font-smoothing:antialiased}button,input,select{font:inherit}a{color:inherit;text-decoration:none}button{cursor:pointer;color:inherit}button:disabled{opacity:.5;cursor:default}h1,h2,h3,h4,p,dl,dd{margin:0}button,a,input,summary,[tabindex]{outline-offset:5px}h1,h2,h3,h4{font-weight:600;line-height:1.15;text-wrap:balance}p{text-wrap:pretty}a,button,summary{-webkit-tap-highlight-color:transparent}:focus-visible{outline:2px solid var(--accent)}svg{vertical-align:middle}button svg,a svg{flex-shrink:0}code{font-family:var(--mono)}.app-body{min-height:100dvh}.a-container{width:min(1280px,calc(100% - 96px));margin-inline:auto}.a-button{display:inline-flex;align-items:center;justify-content:center;gap:22px;min-height:50px;padding:14px 22px;border:1px solid var(--border);border-radius:9px;background:var(--surface);font-size:14px;font-weight:650;line-height:1.45;transition:background .18s,color .18s,box-shadow .18s,transform .18s}.a-button svg,.a-text-link svg{width:19px;height:19px}.a-button:hover{box-shadow:0 4px 12px #20243c12}.a-button:active{transform:translateY(1px)}.a-button-primary{background:var(--ink);border-color:var(--ink);color:var(--canvas)}.a-button-primary:hover{background:var(--accent);border-color:var(--accent);color:var(--on-accent)}.a-text-link{display:inline-flex;align-items:center;gap:12px;font-size:14px;font-weight:600;line-height:1.6}.a-text-link:hover{text-decoration:underline;text-underline-offset:5px}.a-section-label{display:block;font-size:13px;font-weight:600;color:var(--accent);margin-bottom:22px}.a-section-top{display:flex;align-items:flex-end;justify-content:space-between;gap:40px;margin-bottom:45px}.a-section-top h2{font-size:clamp(32px,3.2vw,46px);letter-spacing:-.055em;line-height:1.12}.a-section-top>p{color:var(--muted);font-size:14px;line-height:1.85;padding-bottom:4px}
/* Header uses a small navigation set; language scope is explicit. */
.site-header{height:var(--header-height);position:sticky;top:0;z-index:50;background:color-mix(in srgb,var(--canvas) 92%,transparent);backdrop-filter:blur(18px);border-bottom:1px solid var(--border)}.a-nav-inner{width:min(1440px,calc(100% - 80px));height:100%;margin:auto;display:flex;align-items:center;gap:46px}.a-brand{display:inline-flex;align-items:center;gap:11px;white-space:nowrap;font-size:16px;font-weight:700;letter-spacing:-.055em}.a-brand-mark{display:grid;place-items:center;width:31px;height:33px;background:var(--ink);color:var(--canvas);border-radius:7px;font:500 17px var(--mono);letter-spacing:-.1em;padding-right:2px}.a-brand small{font-size:12px;font-weight:500;letter-spacing:-.015em;color:var(--muted);margin-left:7px}.header-nav{display:flex;align-items:center;gap:28px;font-size:13px;margin-right:auto;color:var(--muted)}.header-nav a{padding:12px 0;transition:color .18s}.header-nav a:hover,.header-nav a.active{color:var(--ink)}.header-nav a.active{font-weight:700}.a-nav-actions{display:flex;align-items:center;gap:12px;margin-left:auto}.a-nav-actions>.a-button{min-height:40px;font-size:12px;padding:9px 15px}.theme-toggle,.menu-toggle{display:grid;place-items:center;width:38px;height:40px;background:transparent;border:1px solid transparent;border-radius:7px}.theme-toggle:hover,.menu-toggle:hover{background:var(--soft)}.theme-toggle svg,.menu-toggle svg{width:19px;height:19px}.ti-sun{display:none}:root[data-theme=dark] .ti-sun{display:block}:root[data-theme=dark] .ti-moon{display:none}.menu-toggle{display:none}.menu-close{display:none}.menu-toggle[aria-expanded=true] .menu-open{display:none}.menu-toggle[aria-expanded=true] .menu-close{display:block}.a-guide-select{position:relative;font-size:12px}.a-guide-select summary{display:flex;align-items:center;gap:7px;cursor:pointer;padding:10px 5px;list-style:none}.a-guide-select summary::-webkit-details-marker{display:none}.a-guide-select svg{width:14px;height:14px}.a-guide-popover{position:absolute;z-index:60;right:0;top:calc(100% + 10px);width:230px;padding:10px;border:1px solid var(--border);border-radius:12px;background:var(--surface);box-shadow:0 14px 45px #20243c1c}.a-guide-popover p{padding:8px 10px 12px;font-size:11px;color:var(--muted);line-height:1.65}.a-guide-popover a{display:block;padding:9px 10px;border-radius:5px;font-size:13px}.a-guide-popover a:hover{background:var(--soft)}.header-page,.header-assessment{display:none}
/* One opening composition; the miniature workflow is the defining visual. */
.a-hero{display:grid;grid-template-columns:1fr 1.08fr;align-items:center;gap:70px;padding-top:103px;padding-bottom:103px;min-height:700px}.a-intro-line{display:flex;align-items:center;gap:9px;font-size:12px;font-weight:600;color:var(--muted);margin-bottom:28px}.a-live-dot{height:7px;width:7px;border-radius:50%;background:var(--accent);box-shadow:0 0 0 4px var(--tint)}.a-hero h1{font-size:clamp(54px,5.8vw,84px);font-weight:550;letter-spacing:-.075em;line-height:1.05;margin-left:-4px}.a-hero-lead{font-size:16px;color:var(--muted);max-width:410px;line-height:1.9;margin-top:27px}.a-hero-actions{display:flex;align-items:center;flex-wrap:wrap;gap:24px;margin-top:33px}.a-hero-actions>.a-text-link{font-size:13px}.a-hero-facts{display:flex;align-items:center;gap:23px;margin-top:45px;font-size:11px;color:var(--muted)}.a-hero-facts strong{font-size:14px;font-weight:700;color:var(--ink);margin-right:4px}.a-hero-note{font-size:11px;color:var(--muted);margin-top:12px}.a-hero-visual{min-width:0;transform:translateY(7px)}.atelier-workbench{padding:28px 23px 19px;border-radius:16px;background:#e9ecf9}.atelier-workbench .wb-stage-label{font-size:12px}.atelier-workbench .wb-statusbar{font-size:10px;line-height:1.7}.atelier-workbench .wb-task-main>p{font-size:13px}.atelier-workbench .wb-task-boundary,.atelier-workbench .wb-context>span{font-size:11px}.atelier-workbench .wb-stage-caption{font-size:12px}.atelier-workbench .wb-check-scope,.atelier-workbench .wb-check-metrics span{font-size:11px}:root[data-theme=dark] .atelier-workbench{--atelier-ink:#202126;--atelier-accent:#4351d8;--atelier-surface:#fff;--atelier-soft:#f1f2f6;background:#292e48;border-color:#383f5c}:root[data-theme=dark] .atelier-workbench .wb-stage-label,:root[data-theme=dark] .atelier-workbench .wb-stage-caption{color:#c5cce9}
.a-principle{display:grid;grid-template-columns:1fr 1.08fr;gap:100px;padding:58px 0 68px;border-top:1px solid var(--border);border-bottom:1px solid var(--border)}.a-principle h2{font-size:38px;letter-spacing:-.055em;line-height:1.15}.a-principle-heading>p{max-width:380px;color:var(--muted);font-size:14px;line-height:1.9;margin-top:22px}.a-learning-loop{padding-top:7px}.a-learning-loop article{display:flex;align-items:flex-start;gap:22px;padding:20px 0;border-bottom:1px solid var(--border)}.a-learning-loop article:first-child{padding-top:0}.a-learning-loop article:last-child{border:0;padding-bottom:0}.a-loop-symbol{display:grid;place-items:center;width:40px;height:40px;flex-shrink:0;background:var(--soft);border-radius:9px;color:var(--accent)}.a-loop-symbol .icon{width:19px;height:19px}.a-learning-loop h3{font-size:15px;font-weight:650;letter-spacing:-.02em;margin:2px 0 8px}.a-learning-loop p{font-size:13px;color:var(--muted);line-height:1.9;max-width:340px}
/* Curriculum: persistent context beside a quiet, ordered reading index. */
.a-curriculum{padding-top:96px;padding-bottom:76px;scroll-margin-top:30px}.a-curriculum-layout{display:grid;grid-template-columns:258px minmax(0,1fr);gap:65px;align-items:start}.a-course-aside{position:sticky;top:106px}.a-progress{border:1px solid var(--border);border-radius:13px;padding:22px;background:var(--surface)}.a-progress-heading{display:flex;align-items:center;gap:14px}.ring-wrap{position:relative;width:58px;height:58px;flex:none;display:grid;place-items:center}.ring{width:58px;height:58px;transform:rotate(-90deg)}.ring circle{fill:none;stroke-width:7}.ring-bg{stroke:var(--border)}.ring-fg{stroke:var(--accent);stroke-linecap:round;transition:stroke-dashoffset .6s cubic-bezier(.2,.7,.3,1)}#ring-pct{position:absolute;font-size:12px;font-weight:700;letter-spacing:-.05em}.a-progress h3{font-size:13px;font-weight:700;letter-spacing:-.015em;margin-bottom:6px}.a-progress-heading p{font-size:10px;line-height:1.7;white-space:nowrap;color:var(--muted)}.a-progress-heading b{font-weight:600}.a-remaining{font-size:10px;color:var(--muted)}.a-next-title{font-size:12px;line-height:1.7;margin:21px 0 14px;min-height:40px;color:var(--muted)}.a-progress>.a-button{width:100%;min-height:42px;padding:10px 12px;font-size:12px;gap:9px;white-space:nowrap}.a-progress>.a-button svg{width:16px}.a-progress-bottom{display:flex;align-items:center;justify-content:space-between;gap:8px;margin-top:17px;font-size:9px;color:var(--muted)}.a-progress-bottom button{padding:5px 0 5px 8px;font-size:10px;color:var(--muted);border:0;background:none}.a-progress-bottom button:hover{color:var(--ink);text-decoration:underline}.a-level-nav{margin:22px 0}.a-level-nav a{display:flex;align-items:center;gap:12px;padding:13px 5px;color:var(--muted);font-size:12px;border-bottom:1px solid var(--border)}.a-level-nav a>span{font:10px var(--mono);color:var(--muted)}.a-level-nav a svg{width:15px;height:15px;margin-left:auto;opacity:0;transition:opacity .18s}.a-level-nav a:hover{color:var(--ink)}.a-level-nav a:hover svg,.a-level-nav a:focus-visible svg{opacity:1}.a-assessment-link{display:block;text-align:left;font-size:11px;line-height:1.8;border:0;background:transparent;color:var(--muted);padding:12px 5px;width:100%}.a-assessment-link span{display:flex;align-items:center;gap:8px;color:var(--ink);font-weight:650;font-size:12px;margin-top:3px}.a-assessment-link svg{width:15px;height:15px}.a-level+.a-level{margin-top:47px}.a-level-heading{display:flex;align-items:flex-start;justify-content:space-between;gap:30px;margin:0 0 23px}.a-level-kicker{font-size:10px;color:var(--muted);display:block;margin-bottom:8px}.a-level-heading h3{font-size:25px;font-weight:600;letter-spacing:-.045em;scroll-margin-top:125px}.a-level-heading p{font-size:12px;line-height:1.85;color:var(--muted);max-width:305px;margin-top:21px}.a-modules{list-style:none;padding:0;margin:0;border-top:1px solid var(--border)}.a-module{border-bottom:1px solid var(--border);background:transparent;padding:26px 0 20px;transition:background-color .18s}.a-module-head{display:flex;align-items:flex-start;gap:18px}.a-module-number{font:500 11px/1 var(--mono);display:grid;place-items:center;width:36px;height:36px;background:var(--soft);border:1px solid var(--border);border-radius:8px;color:var(--muted);flex-shrink:0;margin-top:0}.a-module[data-status=in-progress] .a-module-number{background:var(--tint);border-color:var(--green-line);color:var(--accent)}.a-module[data-status=done] .a-module-number{background:var(--success-bg);border-color:var(--success);color:var(--success)}.a-module-copy{flex:1;min-width:0}.a-module h4{font-size:17px;font-weight:650;line-height:1.45;letter-spacing:-.025em;padding-top:3px}.a-module h4 a:hover{color:var(--accent)}.a-module-copy>p{font-size:12px;line-height:1.85;color:var(--muted);max-width:550px;margin-top:9px}.a-module-meta{display:flex;flex-wrap:wrap;align-items:center;gap:5px 17px;font-size:10px;color:var(--muted);margin-top:13px}.a-module-meta [data-pill]{margin-left:auto;font-size:9px}.a-module[data-status=in-progress] [data-pill]{color:var(--accent)}.a-module[data-status=done] [data-pill]{color:var(--success)}.a-disclosure{display:grid;place-items:center;flex-shrink:0;height:36px;width:36px;background:transparent;border:1px solid transparent;border-radius:7px;color:var(--muted)}.a-disclosure svg{width:18px;height:18px;transition:transform .22s cubic-bezier(.2,.7,.3,1)}.a-disclosure[aria-expanded=true] svg{transform:rotate(180deg)}.a-disclosure:hover{background:var(--soft);color:var(--ink)}.a-module-meter{display:flex;align-items:center;gap:13px;margin:18px 5px 0 54px;font:9px var(--mono);color:var(--muted)}.a-meter-track{display:block;height:2px;flex:1;background:var(--border);border-radius:2px;overflow:hidden}.a-meter-track i{display:block;height:100%;background:var(--accent);transition:width .3s cubic-bezier(.2,.7,.3,1)}.a-lessons{list-style:none;padding:13px 0 0;margin:17px 0 0 54px;border-top:1px solid var(--border)}.a-lessons .lesson{display:flex;align-items:center;gap:12px;padding:12px 4px;font-size:12px;line-height:1.75;min-width:0}.a-lessons .lesson+.lesson{border-top:1px solid color-mix(in srgb,var(--border) 60%,transparent)}.lesson-link{flex:1;min-width:0}.lesson-link:hover{color:var(--accent)}.a-lesson-state{font-size:9px;color:var(--muted);white-space:nowrap}.check{height:19px;width:19px;flex-shrink:0;padding:0;background:var(--surface);border:1px solid var(--border);border-radius:5px;color:var(--accent);display:grid;place-items:center}.check svg{width:14px;height:14px;stroke:currentColor;stroke-width:1.8;stroke-linecap:round;stroke-linejoin:round}.check .check-mark,.check .check-dash{display:none}.check[aria-checked=true]{color:var(--on-accent);background:var(--accent);border-color:var(--accent)}.check[aria-checked=true] .check-mark{display:block}.check[aria-checked=mixed]{border-color:var(--accent);background:var(--tint)}.check[aria-checked=mixed] .check-dash{display:block}
/* Practice moves from context into an immediately usable request. */
.a-practice{padding:74px 0 82px;border-top:1px solid var(--border)}.a-practice-grid{display:grid;grid-template-columns:1.08fr 1fr;gap:24px;align-items:stretch}.a-first-project{background:var(--surface);border:1px solid var(--border);border-radius:15px;padding:35px}.a-project-top{display:flex;align-items:center;gap:10px;font-size:11px;color:var(--muted);margin-bottom:31px}.a-project-icon{display:grid;place-items:center;width:29px;height:29px;background:var(--soft);border-radius:7px;color:var(--accent)}.a-project-icon .icon{width:17px;height:17px}.a-first-project h3{font-size:36px;font-weight:550;letter-spacing:-.05em;line-height:1.15}.a-first-project>p{font-size:13px;line-height:1.9;color:var(--muted);margin-top:22px;max-width:380px}.a-project-files{display:flex;flex-wrap:wrap;gap:9px;margin:25px 0 29px}.a-project-files>span{display:flex;align-items:center;gap:6px;padding:5px 8px;background:var(--soft);border-radius:5px;font:9px var(--mono);color:var(--muted)}.a-project-files .icon{width:12px;height:12px}.a-project-actions{display:flex;align-items:center;flex-wrap:wrap;gap:22px}.a-project-actions .a-button{min-height:42px;font-size:12px;padding:11px 15px;gap:12px}.a-project-actions .a-text-link{font-size:11px}.a-prompt-card{padding:35px;background:var(--soft);border:1px solid var(--border);border-radius:15px;display:flex;flex-direction:column}.a-prompt-card>div{display:flex;align-items:center;justify-content:space-between;gap:15px}.a-prompt-card .a-section-label{font-size:11px;margin:0;color:var(--muted)}.a-prompt-card .copy-button{border:1px solid var(--border);padding:7px 10px;border-radius:6px;font-size:10px;background:var(--surface);white-space:nowrap}.a-prompt-card blockquote{font-size:17px;line-height:1.85;font-weight:500;letter-spacing:-.015em;margin:30px 0 23px}.a-prompt-card>p{font-size:11px;color:var(--muted);line-height:1.8}.a-prompt-card>.a-text-link{margin-top:auto;padding-top:27px;font-size:12px}.a-reading-note{padding:74px 0;border-top:1px solid var(--border);display:grid;grid-template-columns:1fr 1.2fr;gap:0 100px}.a-reading-note>.a-section-label{grid-column:1/-1}.a-reading-note h2{font-size:36px;letter-spacing:-.05em;line-height:1.15}.a-reading-note>p{font-size:15px;color:var(--muted);line-height:1.95;max-width:530px}.a-reading-note>p a{text-decoration:underline;text-underline-offset:4px;color:var(--ink)}.a-reading-note>.a-text-link{grid-column:2;margin-top:20px;font-size:12px}.a-languages{padding:63px 0 79px;border-top:1px solid var(--border);display:grid;grid-template-columns:1fr 1.2fr;gap:90px}.a-languages h2{font-size:32px;font-weight:550;letter-spacing:-.045em;line-height:1.2}.a-languages p{font-size:12px;line-height:1.85;color:var(--muted);max-width:300px;margin-top:20px}.a-languages nav{display:grid;grid-template-columns:1fr 1fr;gap:0 30px;align-content:start}.a-languages nav a{display:flex;align-items:center;justify-content:space-between;gap:12px;font-size:14px;padding:17px 0;border-bottom:1px solid var(--border)}.a-languages nav svg{width:17px;height:17px;color:var(--muted);transition:transform .18s}.a-languages nav a:hover svg{transform:translateX(3px);color:var(--accent)}
/* A quiet footer keeps learning and provenance within reach. */
.site-footer{border-top:1px solid var(--border);background:var(--surface);padding:40px max(40px,calc((100% - 1280px)/2)) 25px}.a-footer-top{display:flex;justify-content:space-between;align-items:flex-start;gap:50px}.a-footer-top p{font-size:12px;color:var(--muted);max-width:260px;line-height:1.9;margin-top:16px}.a-footer-links{display:flex;flex-wrap:wrap;gap:24px;font-size:12px;padding-top:5px}.a-footer-links a:hover{text-decoration:underline;text-underline-offset:4px}.a-footer-languages{display:flex;flex-wrap:wrap;align-items:center;gap:11px 20px;font-size:11px;margin-top:30px;color:var(--muted)}.a-footer-languages>span{font-size:10px;color:var(--muted)}.a-footer-bottom{display:flex;justify-content:space-between;gap:20px;padding-top:24px;margin-top:28px;border-top:1px solid var(--border);font-size:10px;color:var(--muted)}.a-footer-bottom a{text-decoration:underline;text-underline-offset:4px}
/* Reader: one writing measure, with navigation and a lightweight contents rail. */
.reader-layout{padding-top:55px;padding-bottom:90px}.app-rail{top:112px;left:max(32px,calc(50% - 644px));width:218px;font-size:12px}.sidebar-link{font-size:12px;line-height:1.75}.sidebar-group h2{font-size:11px;font-weight:700;margin-bottom:9px}.sidebar-search{font-size:12px}.back-roadmap{font-size:12px}.lesson-heading h1{font:550 43px/1.18 var(--sans);letter-spacing:-.06em;max-width:740px}.breadcrumb{font-size:11px;margin-bottom:28px;color:var(--muted)}.breadcrumb a{color:var(--muted)}.lesson-top-meta{font-size:10px;gap:9px 19px;margin:25px 0}.lesson-top-meta .surface-badge{background:var(--soft);padding:4px 7px;border-radius:4px;color:var(--muted)}.lesson-goal{font-size:18px;line-height:1.85;color:var(--muted);padding-bottom:30px;margin-bottom:30px;border-bottom:1px solid var(--border)}.article-section{margin:38px 0;scroll-margin-top:108px}.article-section h2{font:650 25px/1.35 var(--sans);letter-spacing:-.035em;margin-bottom:21px}.article-section p,.article-section li{font-size:16px;line-height:1.95}.article-section p+p{margin-top:18px}.article-section a{color:var(--accent)}.article-section code{font-size:.84em;white-space:normal;background:var(--soft);border:1px solid var(--border);border-radius:4px;padding:1px 4px}.article-section pre code{font:inherit;white-space:inherit;background:none;border:0;padding:0}.code-block{border:1px solid var(--border);border-radius:10px;overflow:hidden;background:var(--surface)}.code-header{background:var(--soft);padding:13px 18px;font-size:11px;line-height:1.7;gap:20px;color:var(--muted);border-bottom:1px solid var(--border)}.code-block pre{font-size:12px;line-height:1.95;padding:24px;color:var(--ink);background:var(--surface);overflow:auto}.copy-button{transition:background-color .18s}.copy-button:hover{background:var(--tint);color:var(--accent)}.button{border-radius:8px;font-size:13px;min-height:44px;padding:12px 17px;box-shadow:none}.button:hover{transform:none;box-shadow:none;background:var(--soft)}.button-solid,.button-success{background:var(--accent);border-color:var(--accent);color:var(--on-accent)}.button-solid:hover,.button-success:hover{background:var(--accent-hover);color:var(--on-accent)}.lesson-note{background:var(--soft);border-color:var(--border);border-left:2px solid var(--accent);padding:18px 22px;border-radius:0 8px 8px 0}.lesson-note p{font-size:12px;line-height:1.9}.lesson-note strong{font-size:11px}.practice-box{background:var(--tint);border:1px solid var(--green-line);border-radius:12px;padding:29px}.practice-label{color:var(--accent);font-size:11px;margin-bottom:13px}.practice-box h2{font-size:25px}.knowledge-check{padding:28px;background:var(--surface);border:1px solid var(--border);border-radius:12px}.knowledge-check>.eyebrow{font:600 11px var(--sans);letter-spacing:0;text-transform:none;color:var(--muted)}.quiz-option{background:var(--canvas);border-radius:7px;border-color:var(--border);font-size:14px}.quiz-option:hover{background:var(--soft)}.quiz-option:has(input:checked){border-color:var(--accent);background:var(--tint)}.quiz-option input{accent-color:var(--accent)}.quiz-feedback{border-radius:8px}.reference-solution{border-color:var(--border);border-radius:9px;background:var(--surface)}.reference-solution summary{font-size:13px}.lesson-diagram{border-color:var(--border)}.diagram-heading h3{font:650 20px/1.4 var(--sans);letter-spacing:-.025em}.diagram-heading .eyebrow{font:600 11px var(--sans);letter-spacing:0;text-transform:none;color:var(--muted)}.diagram-viewport{border:1px solid var(--border);border-radius:9px;background:var(--surface)}.diagram-viewport img{background:white;border-radius:4px}.diagram-heading 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a{background:var(--surface);border:1px solid var(--border);border-radius:10px;padding:20px}.lesson-navigation a:hover{border-color:var(--accent)}.lesson-navigation strong{font-size:13px;line-height:1.7}.lesson-navigation span{font-size:10px}.guide-scope{border:1px solid var(--green-line);background:var(--tint);border-radius:10px;font-size:12px!important;max-width:780px;margin:24px auto 0}.guide-prose h2,.guide-prose h3{font-family:var(--sans);font-weight:600;letter-spacing:-.035em}.guide-language-nav{justify-content:center;font-size:12px}.translated-guide>#translated-guide-title{text-align:center;font-size:52px}.translated-guide>.eyebrow{text-align:center}.guide-prose{font-size:15px}.guide-prose .code-block pre{white-space:pre-wrap}.guide-prose p{line-height:1.95}.mapping-note summary,.troubleshooting summary{font-size:13px}.mapping-label{font-family:var(--sans);letter-spacing:0}.expected-output pre{background:var(--soft);color:var(--ink)}.output-label{background:var(--soft);color:var(--muted)}.assessment-dialog,.file-dialog,.diagram-dialog{background:var(--surface);color:var(--ink);border-color:var(--border);border-radius:14px}.assessment-dialog h2,.file-dialog h2,.diagram-dialog h2{font-family:var(--sans);letter-spacing:-.04em}.assessment-dialog::backdrop,.diagram-dialog::backdrop,.file-dialog::backdrop{background:#151b3059;backdrop-filter:blur(4px)}.toast{border-radius:9px;background:var(--ink);color:var(--canvas);font-size:12px}.storage-notice{background:var(--tint);color:var(--ink);border-bottom:1px solid var(--border);font-size:12px}.loading-state,.error-state{padding:95px 48px;max-width:1000px;margin:auto}.error-state h1{font-size:42px;letter-spacing:-.055em}.error-state p{max-width:560px;color:var(--muted);margin:25px 0;line-height:1.9}.theme-changing body,.theme-changing .site-header,.theme-changing .site-footer,.theme-changing .a-progress{transition:background-color .2s,color .2s,border-color .2s}
/* Static reading route keeps full lesson text available without JavaScript. */
.static-reader{max-width:790px;margin:auto;padding:55px 28px 90px}.static-reader h1{font-size:43px;line-height:1.2;letter-spacing:-.055em;margin:28px 0}.static-reader h2{font-size:25px;margin:40px 0 20px;letter-spacing:-.035em}.static-reader h3{font-size:20px;margin:30px 0 15px}.static-reader p,.static-reader li{font-size:16px;line-height:1.95;margin-bottom:15px}.static-reader a{color:var(--accent);text-decoration:underline;text-underline-offset:4px}.static-reader pre{padding:22px;background:var(--surface);border:1px solid var(--border);border-radius:8px;overflow:auto;font:12px/1.9 var(--mono)}.static-reader img{width:100%;height:auto;background:white;border:1px solid var(--border);border-radius:8px}.static-reader details{padding:18px;margin-block:24px;border:1px solid var(--border);border-radius:8px;background:var(--surface)}.static-reader summary{cursor:pointer;font-weight:650}.static-reader details[open] summary{margin-bottom:20px}.static-reader .static-nav{display:flex;justify-content:space-between;gap:20px;margin-top:40px;padding-top:25px;border-top:1px solid var(--border)}.static-reader .static-notice{font-size:12px;color:var(--muted);padding:15px 20px;background:var(--soft);border-radius:8px}
.header-nav{font-size:14px}.a-module h4{font-size:19px}.a-module-copy>p{font-size:13px}.a-module-meta{font-size:11px}.a-module-meta [data-pill]{font-size:10px}.a-level-heading p{font-size:13px}.a-next-title{font-size:13px}.a-progress h3{font-size:14px}.a-progress-heading p,.a-remaining{font-size:11px}.a-progress-bottom{font-size:10px}.a-level-nav a{font-size:13px}.a-assessment-link{font-size:12px}.a-assessment-link span{font-size:13px}.a-lessons .lesson{font-size:13px}.a-lesson-state{font-size:10px}.a-progress>.a-button{min-height:45px}.atelier-workbench .wb-diff pre{font-size:12px}.a-footer-links{font-size:13px}.a-footer-languages{font-size:12px}
@media(min-width:1400px){.reader-layout{max-width:1280px;margin:auto;padding-left:260px;padding-right:200px}.lesson-article{max-width:740px}.lesson-toc{position:fixed;right:max(32px,calc(50% - 640px));top:132px;width:156px;display:flex;flex-direction:column;gap:7px;padding:0 0 0 17px;border:0;border-left:1px solid var(--border);margin:0;font-size:11px}.lesson-toc>span{display:block;font-size:10px;font-weight:650;color:var(--muted);margin-bottom:6px}.lesson-toc a{padding:5px 0;color:var(--muted)}.lesson-toc a:hover{color:var(--ink)}}
@media(max-width:1200px){.a-container{width:calc(100% - 64px)}.a-nav-inner{width:calc(100% - 56px);gap:30px}.a-hero{gap:36px;padding-top:80px;padding-bottom:80px;min-height:650px}.a-hero h1{font-size:68px}.a-hero-facts{gap:16px}.a-principle{gap:65px}.a-curriculum-layout{gap:40px;grid-template-columns:235px minmax(0,1fr)}.a-progress{padding:18px}.a-level-heading{gap:20px}.a-level-heading p{max-width:260px}.a-module-copy>p{font-size:12px}.a-guide-select{display:none}.a-nav-actions{gap:10px}}
@media(max-width:1000px){:root{--header-height:68px}.header-nav{gap:23px}.a-hero{grid-template-columns:1fr 1fr;gap:28px;min-height:630px}.a-hero h1{font-size:61px}.a-hero-lead{font-size:14px}.a-hero-actions{gap:18px}.a-hero-facts{flex-wrap:wrap;gap:8px 17px;margin-top:30px}.a-hero-facts strong{font-size:13px}.a-hero-actions>.a-text-link{font-size:12px}.atelier-workbench{padding:21px 15px 16px}.a-principle h2{font-size:32px}.a-principle{gap:45px}.a-curriculum-layout{grid-template-columns:210px minmax(0,1fr);gap:29px}.a-progress{padding:16px}.a-progress-heading{gap:10px}.ring-wrap,.ring{width:48px;height:48px}.a-progress h3{font-size:12px}.a-progress-heading p,.a-remaining{font-size:9px}.a-progress>.a-button{font-size:11px;gap:6px}.a-level-heading{display:block}.a-level-heading p{margin-top:13px;max-width:390px}.a-module-head{gap:13px}.a-module h4{font-size:16px}.a-module-meta{gap:4px 13px}.a-module-meta [data-pill]{margin-left:0}.a-module-meter,.a-lessons{margin-left:49px}.a-disclosure{height:32px;width:30px}.a-first-project,.a-prompt-card{padding:28px}.a-first-project h3{font-size:32px}.a-prompt-card blockquote{font-size:15px}.a-reading-note,.a-languages{gap:45px}.a-section-top>p{font-size:12px}.site-footer{padding-inline:32px}.a-nav-inner{gap:30px}.app-rail{top:0;left:0;width:290px}.app-rail.open{z-index:80}.rail-backdrop{z-index:70;background:#20243b66}.drawer-open{overflow:hidden}.rail-brand-row{border-bottom:1px solid var(--border)}.rail-brand-row .brand-mark{background:var(--ink);color:var(--canvas);border:0}.sidebar-link{font-size:12px}.reader-layout{padding:39px 32px 75px}.lesson-heading h1{font-size:38px}body[data-page=lesson] .menu-toggle{display:grid}body[data-page=lesson] .header-nav{display:none}.a-footer-top{gap:32px}.a-footer-links{gap:20px}}
@media(max-width:800px){.a-container{width:calc(100% - 48px)}.a-nav-inner{width:calc(100% - 40px)}.header-nav{display:none;position:absolute;top:calc(100% - 1px);left:0;right:0;padding:13px 24px 20px;background:var(--surface);border-bottom:1px solid var(--border);box-shadow:0 10px 18px #20243b0a;margin:0;flex-direction:column;align-items:stretch;gap:0}.header-nav.open{display:flex}.header-nav a{padding:13px 0;border-bottom:1px solid var(--border);font-size:14px}.header-nav a:last-child{border:0}.menu-toggle{display:grid}.a-nav-actions>.a-button{display:none}.a-guide-select{display:block}.a-nav-actions{gap:6px}.a-hero{grid-template-columns:1fr;gap:45px;padding-top:60px;padding-bottom:58px;min-height:0}.a-hero-copy{max-width:600px}.a-hero h1{font-size:72px;line-height:1.06}.a-hero-lead{font-size:16px;max-width:470px;margin-top:24px}.a-hero-actions{margin-top:25px}.a-hero-facts{margin-top:30px}.a-hero-visual{width:100%;max-width:620px;transform:none}.atelier-workbench{padding:25px 26px 18px}.a-principle{grid-template-columns:1fr;gap:31px;padding:48px 0 49px}.a-principle-heading>p{max-width:500px;font-size:14px;margin-top:20px}.a-learning-loop{padding-top:0}.a-learning-loop article{padding:20px 0}.a-learning-loop p{max-width:480px}.a-curriculum{padding-top:62px;padding-bottom:55px}.a-curriculum-layout{grid-template-columns:1fr;gap:32px}.a-section-top{display:block;margin-bottom:31px}.a-section-top>p{margin-top:21px;font-size:13px}.a-course-aside{position:static;display:grid;grid-template-columns:1fr 1fr;align-items:start;gap:0 26px}.a-progress{padding:23px}.a-progress-heading{gap:13px}.ring-wrap,.ring{width:58px;height:58px}.a-progress h3{font-size:13px}.a-progress-heading p,.a-remaining{font-size:10px}.a-progress>.a-button{font-size:12px}.a-level-nav{margin:0}.a-assessment-link{grid-column:2;margin-top:-65px}.a-level-heading{display:flex}.a-level-heading p{max-width:290px;margin-top:16px}.a-level+.a-level{margin-top:35px}.a-module{padding:24px 0 20px}.a-module-head{gap:17px}.a-module h4{font-size:17px}.a-module-meta [data-pill]{margin-left:auto}.a-module-meter,.a-lessons{margin-left:53px}.a-disclosure{width:36px;height:36px}.a-lesson-state{display:none}.a-practice{padding:50px 0}.a-practice-grid{grid-template-columns:1fr}.a-first-project{padding:30px}.a-first-project>p{max-width:500px}.a-prompt-card{padding:30px}.a-prompt-card blockquote{max-width:600px;font-size:17px}.a-reading-note{padding:48px 0;grid-template-columns:1fr;gap:0}.a-reading-note>p{margin-top:25px;max-width:600px;font-size:14px}.a-reading-note>.a-text-link{grid-column:1;margin-top:19px}.a-languages{padding:47px 0;grid-template-columns:1fr;gap:28px}.a-languages p{max-width:440px}.a-languages nav{gap:0 35px}.a-footer-top{display:block}.a-footer-links{margin-top:25px;gap:20px}.a-footer-bottom{font-size:9px}.site-footer{padding:32px 24px 24px}.a-brand small{display:none}.a-guide-select summary{font-size:11px}.lesson-top-meta{font-size:10px}.lesson-heading h1{font-size:36px}.lesson-goal{font-size:17px}.article-section p,.article-section li{font-size:16px}.lesson-toc{font-size:11px}.source-page>h1{font-size:46px}}
@media(max-width:480px){.a-hero{padding-top:44px;gap:34px}.a-hero h1{font-size:56px;letter-spacing:-.07em}.a-intro-line{font-size:11px;margin-bottom:24px}.a-hero-lead{font-size:14px;line-height:1.9}.a-hero-actions{gap:19px 22px;align-items:flex-start}.a-hero-actions .a-button{min-height:47px;font-size:12px;padding:13px 17px;gap:21px}.a-hero-actions>.a-text-link{min-height:46px;font-size:11px}.a-hero-facts{gap:8px 15px;font-size:10px}.a-hero-facts strong{font-size:12px}.a-hero-note{font-size:10px;margin-top:11px}.atelier-workbench{padding:19px 13px 14px}.atelier-workbench .wb-stage-label{font-size:10px;gap:7px}.atelier-workbench .wb-task-main>p{font-size:12px}.atelier-workbench .wb-context>span{font-size:10px}.atelier-workbench .wb-task-boundary{font-size:10px}.atelier-workbench .wb-statusbar{font-size:9px}.atelier-workbench .wb-stage-caption{font-size:10px}.a-principle h2{font-size:30px}.a-section-label{font-size:11px;margin-bottom:19px}.a-principle-heading>p{font-size:13px}.a-learning-loop article{gap:16px}.a-learning-loop h3{font-size:14px}.a-learning-loop p{font-size:12px;line-height:1.9}.a-loop-symbol{height:35px;width:35px}.a-section-top h2{font-size:33px}.a-course-aside{display:block}.a-progress{padding:22px}.a-progress-heading{gap:15px}.a-progress-heading p,.a-remaining{font-size:11px}.a-progress h3{font-size:14px}.a-next-title{margin:18px 0 15px;min-height:0;font-size:12px}.a-progress>.a-button{font-size:12px;justify-content:space-between;min-height:43px}.a-progress-bottom{font-size:10px}.a-progress-bottom button{font-size:11px}.a-level-nav{display:flex;gap:20px;margin-top:15px;overflow:auto;padding-bottom:5px}.a-level-nav a{flex-shrink:0;gap:7px;border:0;font-size:11px;padding-block:9px}.a-level-nav a svg{display:none}.a-level-nav a>span{font-size:9px}.a-assessment-link{margin:8px 0 0;padding:7px 0;font-size:10px}.a-assessment-link span{font-size:11px}.a-curriculum-layout{gap:31px}.a-level-heading{display:block}.a-level-heading p{font-size:12px;max-width:none;line-height:1.8;margin-top:14px}.a-level-heading h3{font-size:25px}.a-module-head{gap:11px}.a-module-number{width:29px;height:31px;font-size:10px;border-radius:6px;margin-top:3px}.a-module h4{font-size:16px;line-height:1.5;padding:0}.a-module-copy>p{font-size:11px;line-height:1.9;margin-top:10px}.a-module-meta{font-size:9px;gap:5px 13px;margin-top:12px}.a-module-meta [data-pill]{margin-left:0;font-size:9px}.a-disclosure{width:29px;height:32px;padding:0}.a-disclosure svg{width:17px;height:17px}.a-module-meter,.a-lessons{margin-left:40px}.a-lessons .lesson{font-size:11px;gap:10px;padding:13px 2px;line-height:1.85}.check{width:19px;height:19px}.a-module-meter{margin-top:17px}.a-first-project,.a-prompt-card{padding:25px}.a-first-project h3{font-size:32px}.a-first-project>p{font-size:12px}.a-project-top{margin-bottom:25px}.a-project-files{gap:7px;margin-block:23px}.a-project-files>span{font-size:8px}.a-project-actions{gap:16px}.a-project-actions .a-button{font-size:11px}.a-prompt-card blockquote{font-size:15px;margin-top:24px}.a-prompt-card>div{gap:10px;align-items:flex-start}.a-prompt-card .a-section-label{font-size:10px}.a-prompt-card .copy-button{font-size:9px;padding:6px 8px}.a-reading-note h2{font-size:31px}.a-languages h2{font-size:30px}.a-languages p{font-size:11px}.a-languages nav a{font-size:13px;padding:16px 0}.a-footer-bottom{display:block;line-height:1.9}.a-footer-bottom>a{display:inline-block;margin-top:14px}.a-footer-languages{gap:12px 18px;font-size:10px}.a-footer-languages>span{width:100%}.a-nav-inner{gap:10px}.a-brand{font-size:14px;gap:9px}.a-brand-mark{width:28px;height:30px;font-size:15px}.a-nav-actions{gap:1px}.a-guide-select summary{padding:10px 5px;font-size:10px}.theme-toggle,.menu-toggle{width:32px}.a-guide-popover{right:-68px;width:230px}.a-guide-popover p{font-size:11px}.a-guide-popover a{font-size:13px}.reader-layout{padding:29px 24px 60px}.breadcrumb{font-size:10px;margin-bottom:23px;gap:15px}.lesson-heading h1{font-size:32px;line-height:1.25;letter-spacing:-.05em}.lesson-top-meta{font-size:9px;gap:7px 12px;margin-block:21px}.lesson-goal{font-size:15px;line-height:1.9;margin-bottom:23px;padding-bottom:24px}.article-section{margin:29px 0}.article-section h2{font-size:23px;margin-bottom:19px}.article-section p,.article-section li{font-size:15px;line-height:1.95}.code-header{font-size:10px;padding:11px 14px}.code-block pre{font-size:11px;padding:18px}.practice-box,.knowledge-check{padding:21px}.quiz-option{font-size:13px}.source-page{padding:38px 24px 60px}.source-page>h1{font-size:39px}.source-page .source-lead{font-size:16px}.guide-language-nav{font-size:11px;gap:10px 19px}.translated-guide>#translated-guide-title{font-size:40px}.guide-prose{font-size:14px}.guide-scope{font-size:11px!important}.guide-prose h2{font-size:27px}.guide-prose h3{font-size:22px}.static-reader{padding-inline:24px}.static-reader h1{font-size:32px}.static-reader p,.static-reader li{font-size:15px}.static-reader pre{font-size:11px;padding:16px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*::before,*::after{animation-duration:.01ms!important;animation-iteration-count:1!important;transition-duration:.01ms!important;scroll-behavior:auto!important}}
@media print{.site-header,.site-footer,.a-course-aside{display:none}.static-reader{padding:0;max-width:none}body{background:white;color:black}}
/* Reading and touch refinements after independent review. */
.static-masthead{max-width:1280px;margin:auto;display:flex;justify-content:space-between;align-items:center;gap:24px;padding:22px 28px;border-bottom:1px solid var(--border);font-size:13px}.static-masthead>a{font-weight:700}.static-masthead nav{display:flex;flex-wrap:wrap;gap:10px 24px;color:var(--muted)}
html:not(.js) .js-only{display:none!important}html:not(.js) .site-header{height:auto;min-height:76px}html:not(.js) .a-nav-inner{padding-block:15px;flex-wrap:wrap;gap:15px 25px}html:not(.js) .header-nav{display:flex;position:static;flex-direction:row;flex-wrap:wrap;gap:15px;margin:0;padding:0;box-shadow:none;border:0;background:none}html:not(.js) .header-nav a{padding:5px 0;border:0}html:not(.js) .a-nav-actions{margin-left:auto}html:not(.js) .storage-notice{display:block;padding:16px 24px;line-height:1.8}html:not(.js) .storage-notice a{text-decoration:underline;font-weight:600}html:not(.js) .a-guide-select{display:block}
@media(max-width:800px){.a-disclosure{width:44px;height:44px}.a-module-copy>p{font-size:13px}.a-module-meta{font-size:11px}.a-lessons .lesson{font-size:14px}.a-module-head{gap:12px}.static-masthead{padding:18px 24px}.static-masthead nav{font-size:11px;gap:8px 16px}.a-lessons .check{position:relative;width:44px;height:44px;border:0;background:transparent;border-radius:8px;flex:none}.a-lessons .check::before{content:'';position:absolute;width:20px;height:20px;border:1px solid var(--border);border-radius:5px;background:var(--surface)}.a-lessons .check svg{position:relative;z-index:1}.a-lessons .check[aria-checked=true]::before{background:var(--accent);border-color:var(--accent)}.a-lessons .check[aria-checked=mixed]::before{background:var(--tint);border-color:var(--accent)}}
@media(max-width:480px){.a-nav-inner{width:calc(100% - 32px)}.theme-toggle,.menu-toggle{width:44px;height:44px}.a-module h4{font-size:18px}.a-module-copy>p{font-size:13px;line-height:1.8}.a-module-meta,.a-module-meta [data-pill]{font-size:11px}.a-disclosure{width:44px;height:44px;margin-right:-8px}.a-lessons{margin-left:0}.a-lessons .lesson{font-size:14px;gap:8px;padding:9px 0;line-height:1.75}.a-level-heading p{font-size:13px}.a-hero-lead{font-size:15px}.a-learning-loop p{font-size:13px}.a-assessment-link{min-height:44px;font-size:12px}.a-assessment-link span{font-size:12px}.a-level-nav a{min-height:44px;font-size:12px}.a-progress-bottom{font-size:11px}.a-progress-bottom button{min-height:44px;font-size:12px}.static-masthead{align-items:flex-start;gap:16px}.static-masthead nav{display:grid}}

/* Optical spacing and secondary information reviewed at desktop scale. */
.a-hero h1{letter-spacing:-.045em}.a-section-top h2{letter-spacing:-.035em}.a-principle h2{letter-spacing:-.035em}.a-module-meta,.a-module-meta [data-pill]{font-size:12px}.a-lesson-state{font-size:11px}.atelier-workbench .wb-diff-code{font-size:13px}.atelier-workbench .wb-stage-caption{font-size:12px}.lesson-heading h1{letter-spacing:-.04em}
@media(max-width:480px){.a-hero h1{font-size:clamp(44px,14.4vw,56px);letter-spacing:-.045em}.a-module-meta,.a-module-meta [data-pill]{font-size:11px}.a-section-top h2{letter-spacing:-.035em}.atelier-workbench .wb-stage-caption{font-size:11px}.lesson-heading h1{letter-spacing:-.035em}}

/* Reader navigation shares the course typography, without redundant workspace chrome. */
.workspace-label{display:none}.sidebar-link{font-size:13px}.sidebar-group h2{font-size:12px;line-height:1.6}.external-docs{display:flex;align-items:center;gap:8px;font-size:12px;padding-top:15px}.a-module-meta [data-pill]{margin-left:0}.atelier-workbench .wb-diff pre{font-size:13px}
@media(max-width:480px){.atelier-workbench .wb-diff pre{font-size:12px}.sidebar-link{font-size:13px}}
@media(max-width:480px){.a-level-nav{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px;overflow:visible;padding-bottom:0}.a-level-nav a{display:flex;flex-direction:column;align-items:flex-start;justify-content:flex-start;min-width:0;min-height:68px;gap:7px;font-size:11px;line-height:1.6;white-space:normal}.a-guide-select summary{min-height:44px}}
@media(max-width:480px){.a-hero{padding-top:38px;gap:25px}.a-hero-actions{gap:12px;margin-top:22px}.a-hero-actions .a-button{padding-inline:14px;gap:12px}.a-hero-actions>.a-text-link{gap:8px}.a-hero-facts{margin-top:24px}.a-hero-note{margin-top:8px}}
.static-reader .static-reading-notice{padding:16px 20px}.static-reader .static-reading-notice strong{display:block;font-size:12px;margin-bottom:8px}.static-reader .static-reading-notice p{font-size:13px;line-height:1.8;margin:0}
/* Long product/configuration identifiers must wrap inside narrow lesson columns. */
.lesson-article p,.lesson-article li,.guide-prose p,.guide-prose li{overflow-wrap:anywhere}.lesson-article pre{overflow-wrap:normal}