/* Field guide, second craft pass. Original geometry; sources in docs/finish-design-2026-10-22.md. */
::view-transition-group(root){animation-duration:180ms;animation-timing-function:cubic-bezier(.16,1,.3,1)}
:root{--motion-out:cubic-bezier(.16,1,.3,1)}
.a-curriculum .a-modules{position:relative}.a-module{position:relative}.a-module:not(:last-child)::after{content:'';position:absolute;top:57px;bottom:-20px;left:19px;width:1px;background:var(--border);z-index:0}.a-module-head{position:relative;z-index:1}.a-module-number{background:var(--bg);box-shadow:0 0 0 6px var(--bg)}.a-module[data-status=in-progress] .a-module-number{background:var(--tint);border-color:var(--accent);color:var(--accent)}.a-module[data-status=done] .a-module-number{background:var(--accent);color:var(--bg);border-color:var(--accent)}
.a-next-caption{display:block;font-size:10px;letter-spacing:.1em;text-transform:uppercase;color:var(--muted);margin:20px 0 -10px}.a-progress .a-next-title{margin-top:20px}.a-path-summary{font-size:12px;line-height:1.8;color:var(--muted);margin:14px 0 0}.a-path-summary a{color:var(--accent);text-decoration:underline;text-underline-offset:3px}.a-progress-bottom span{line-height:1.6}.a-assessment-link{text-align:left}
.a-reference-entry{margin-top:24px;padding-top:20px;border-top:1px solid var(--border);display:flex;flex-direction:column;gap:7px;font-size:13px}.a-reference-entry small{color:var(--muted);line-height:1.7}
.header-search{display:flex;align-items:center;justify-content:center;gap:8px;min-width:44px;height:44px;border:0;background:transparent;color:var(--text);border-radius:8px;cursor:pointer}.header-search svg{width:18px;height:18px}.header-search kbd{font:10px inherit;color:var(--muted);border:1px solid var(--border);padding:3px 5px;border-radius:4px}.header-search:hover{background:var(--tint)}
.reading-progress{position:sticky;top:76px;height:2px;background:var(--border);z-index:5;margin:0 0 27px;grid-column:1/-1}.reading-progress i{display:block;height:100%;background:var(--accent);transform:scaleX(0);transform-origin:left}.lesson-toc a[aria-current=location]{color:var(--accent);font-weight:700}.lesson-toc a{transition:color 120ms var(--motion-out)}.lesson-journey{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:14px 0;margin-top:-8px;border-bottom:1px solid var(--border);font-size:12px;color:var(--muted)}.lesson-journey a{color:var(--accent);font-weight:600}.lesson-journey span{line-height:1.6}.lesson-note{border-left:2px solid var(--accent)}
/* Syntax is readable on the existing light code surface in either page theme. */
.code-block pre{color:#253143;background:#f5f6fa}.code-block .token.comment,.code-block .token.prolog{color:#606b7b;font-style:italic}.code-block .token.keyword,.code-block .token.boolean{color:#6941bd}.code-block .token.string,.code-block .token.attr-value{color:#14664f}.code-block .token.function,.code-block .token.class-name{color:#2158a8}.code-block .token.number{color:#a53c20}.code-block .token.property,.code-block .token.attr-name,.code-block .token.tag{color:#a52e5a}.code-block .token.operator,.code-block .token.punctuation{color:#4d5870}
[data-theme=dark] .code-block pre{color:#e2e7f2;background:#1b1e29}[data-theme=dark] .code-block .token.comment{color:#9ea9bd}[data-theme=dark] .code-block .token.keyword,[data-theme=dark] .code-block .token.boolean{color:#c3adff}[data-theme=dark] .code-block .token.string,[data-theme=dark] .code-block .token.attr-value{color:#9cdec4}[data-theme=dark] .code-block .token.function,[data-theme=dark] .code-block .token.class-name{color:#a4c9ff}[data-theme=dark] .code-block .token.number{color:#ffc19f}[data-theme=dark] .code-block .token.property,[data-theme=dark] .code-block .token.attr-name,[data-theme=dark] .code-block .token.tag{color:#ffaacb}[data-theme=dark] .code-block .token.operator,[data-theme=dark] .code-block .token.punctuation{color:#c4cde0}
.reference-page{max-width:1190px}.reference-toolbar{display:grid;grid-template-columns:1fr auto;gap:9px 24px;margin:35px 0 25px}.reference-toolbar label{grid-column:1/-1;font-size:12px;font-weight:600}.reference-toolbar input,.search-dialog>input{font:inherit;font-size:16px;padding:15px 18px;border:1px solid var(--border);border-radius:10px;background:var(--surface);color:var(--text);min-width:0}.reference-toolbar p{align-self:center;font-size:12px;color:var(--muted)}.reference-index{display:flex;flex-wrap:wrap;gap:8px;margin:25px 0 38px}.reference-index a{padding:8px 12px;border:1px solid var(--border);border-radius:7px;font-size:12px}.reference-index a:hover{border-color:var(--accent);color:var(--accent)}.reference-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:24px}.reference-card{padding:27px;border:1px solid var(--border);border-radius:14px;background:var(--surface);scroll-margin-top:100px}.reference-card-top{display:flex;justify-content:space-between;gap:12px;color:var(--muted);font-size:11px}.reference-card h2{font-size:24px;letter-spacing:-.025em;line-height:1.35;margin:17px 0 14px}.reference-card>p,.reference-card li{font-size:14px;line-height:1.85;overflow-wrap:anywhere}.reference-card details{margin-top:20px;border-block:1px solid var(--border);padding:14px 0;font-size:13px}.reference-card details ul{padding-left:20px;margin-top:15px}.reference-card summary{cursor:pointer;font-weight:600}.reference-examples h3{font-size:11px;text-transform:uppercase;letter-spacing:.09em;color:var(--muted);margin:24px 0 8px}.reference-examples a{display:flex;flex-direction:column;gap:5px;padding:13px 0;border-bottom:1px solid var(--border);font-size:13px;line-height:1.65}.reference-examples a:hover span{color:var(--accent)}.reference-examples small{font-size:10px;color:var(--muted)}.reference-card>.text-link{display:block;margin-top:23px;font-size:13px}.reference-empty,.search-empty{padding:24px;color:var(--muted)}
.search-dialog{width:min(680px,calc(100% - 32px));max-height:85dvh;padding:27px;border:1px solid var(--border);border-radius:16px;background:var(--bg);color:var(--text);box-shadow:0 24px 100px #0003}.search-dialog .dialog-top{align-items:center;gap:16px;margin-bottom:22px}.search-dialog h2{font-size:23px;letter-spacing:-.025em}.search-dialog>input{width:100%}.search-dialog #search-count{font-size:12px;color:var(--muted);padding:15px 0}.search-dialog #search-results{overflow:auto;max-height:48dvh;overscroll-behavior:contain}.search-dialog #search-results a{display:block;padding:16px 12px;border-top:1px solid var(--border);border-radius:6px}.search-dialog #search-results a:hover,.search-dialog #search-results a:focus-visible{background:var(--tint)}.search-dialog #search-results span{display:block;font-weight:650;font-size:14px}.search-dialog #search-results small{display:block;font-size:10px;color:var(--muted);margin-top:6px}.search-dialog #search-results p{font-size:12px;line-height:1.8;color:var(--muted);margin-top:7px}.search-dialog>.fine-print{margin-top:15px;font-size:10px}
.assessment-modes{display:grid;gap:12px;margin:25px 0}.assessment-mode{border:1px solid var(--border);border-radius:12px;background:var(--surface);color:var(--text);padding:22px;text-align:left;cursor:pointer}.assessment-mode:hover{border-color:var(--accent);background:var(--tint)}.assessment-mode strong{display:flex;justify-content:space-between;gap:15px;font-size:17px}.assessment-mode strong span{color:var(--muted);font-size:11px;align-self:center}.assessment-mode p{font-size:13px;line-height:1.8;margin:12px 0 0}.assessment-dialog h2{line-height:1.3;letter-spacing:-.025em}.assessment-status{display:flex;justify-content:space-between;font-size:12px;color:var(--muted);margin:12px 0}.assessment-dialog progress{width:100%;height:4px;accent-color:var(--accent);margin-bottom:23px}.assessment-dialog fieldset{border:0;padding:0;margin:22px 0}.assessment-dialog legend{font-size:15px;line-height:1.85;margin-bottom:18px}.assessment-dialog .quiz-option{padding:14px;font-size:13px;line-height:1.75}.assessment-dialog .quiz-option:has(input:checked){border-color:var(--accent);background:var(--tint)}#assessment-feedback:not(:empty){border-top:1px solid var(--border);margin-top:22px;padding-top:20px}#assessment-feedback p{font-size:14px;line-height:1.85}.assessment-review{margin:25px 0}.assessment-review h3{font-size:16px;margin:20px 0 12px}.assessment-review a{display:block;font-size:13px;line-height:1.8;padding:10px 0;color:var(--accent);border-bottom:1px solid var(--border)}
.theme-changing .a-home,.theme-changing .source-page,.theme-changing .lesson-article{transition:background-color 180ms var(--motion-out),color 180ms var(--motion-out)}
@media(min-width:1001px) and (max-width:1250px){.a-brand small{display:none}.header-nav{gap:18px}.a-nav-actions{gap:5px}.header-search kbd{display:none}}
@media(max-width:1000px){.reading-progress{top:68px}.header-search kbd{display:none}.a-module:not(:last-child)::after{left:19px}}
@media(max-width:700px){.reference-grid{grid-template-columns:1fr}.reference-toolbar{grid-template-columns:1fr}.reference-toolbar p{margin:0}.reference-card{padding:23px}.reference-page{padding-inline:24px}.lesson-journey{align-items:flex-start;font-size:11px}.search-dialog{padding:20px}.a-module:not(:last-child)::after{left:14px;top:48px}.a-next-caption{font-size:10px}.a-path-summary{font-size:11px}}
@media(max-width:480px){.header-search{min-width:38px;width:38px}.a-guide-select summary{font-size:11px}.a-nav-inner{gap:6px}.a-brand small{display:none}.a-nav-actions{gap:0}.a-nav-actions>.a-button{display:none}.a-progress-bottom{align-items:center}.a-hero-facts{font-size:12px}.a-hero-facts strong{font-size:14px}.a-hero-note{font-size:11px}.a-principle-heading>p,.a-learning-loop p{font-size:14px;line-height:1.85}.a-module h4{font-size:19px}.a-level-heading p{font-size:14px}.a-reading-note p,.a-languages p{font-size:14px;line-height:1.85}.a-languages nav a{font-size:15px}.a-reference-entry{font-size:13px}.a-progress-bottom span{max-width:160px}.assessment-mode{padding:17px}.assessment-mode strong{font-size:16px}.assessment-dialog{padding:22px}.assessment-dialog h2{font-size:25px}}
@media(prefers-reduced-motion:reduce){*,*::before,*::after{animation:none!important;transition:none!important;scroll-behavior:auto!important}}

.atelier-workbench .wb-tabs button:not([aria-selected=true]){color:#64697a}.atelier-workbench .wb-file-tree>p{color:#64697a}

@media(max-width:380px){.a-brand{font-size:12px;gap:7px}.a-brand-mark{width:24px;height:28px}.a-guide-select{display:none}.a-nav-inner{width:calc(100% - 24px)}}
.atelier-workbench .wb-stage-caption{color:#575e78}.diagram-load-notice{padding:24px;font-size:14px;line-height:1.8;color:var(--muted)}
.atelier-workbench .wb-panels{display:grid}.atelier-workbench .wb-panel{grid-area:1/1;align-self:stretch}.atelier-workbench .wb-panel[hidden]{display:block!important;visibility:hidden;pointer-events:none}

/* Reading floor retained from the original layout acceptance contract. */
.code-block pre,.expected-output pre{font-size:13px}.article-section p,.article-section li{font-size:16px}.a-hero-actions .a-button{font-size:14px;min-height:48px}
.a-hero h1{margin-left:0}@media(max-width:800px){.a-hero-copy{max-width:none}}
.reference-heading h1{font:550 clamp(38px,4.5vw,58px)/1.12 var(--sans);letter-spacing:-.04em;margin:18px 0}.reference-heading .source-lead{font-size:18px;line-height:1.8}

.diagram-heading .button{font-size:13px;min-height:44px}@media(max-width:380px){.lesson-diagram{margin-left:-9px;margin-right:-9px}}
html:not(.app-ready) .js-only{display:none!important}
.route-loading{display:none}
html.boot-deep-link:not(.app-ready) #main-content>[data-static-snapshot]{display:none}
html.boot-deep-link:not(.app-ready) #main-content>.route-loading{display:block}
/* Intrinsic wrapping keeps enlarged navigation text and its actions in view. */
.site-header{height:auto;min-height:var(--header-height)}
.a-nav-inner{height:auto;min-height:var(--header-height);flex-wrap:wrap;row-gap:8px;padding-block:8px}
@media(min-width:1001px){
 .app-rail{top:calc(var(--actual-header-height,var(--header-height)) + 36px)}
 .lesson-toc{top:calc(var(--actual-header-height,var(--header-height)) + 48px);max-height:calc(100dvh - var(--actual-header-height,var(--header-height)) - 72px)}
 body[data-page=lesson] .site-footer{margin-left:calc(max(32px,(100vw - 1288px)/2) + 250px);padding-left:14px}
}
@media(min-width:1201px){body[data-page=lesson] .site-footer{margin-right:calc(max(32px,(100vw - 1288px)/2) + 220px)}body[data-page=lesson] .a-footer-top{flex-wrap:wrap}}

.reference-snippet .code-block{margin-top:18px}.reference-snippet .code-header{flex-wrap:wrap;gap:8px}.reference-snippet pre{max-height:340px;overflow:auto;font-size:12px}.reference-snippet .fine-print{font-size:11px;line-height:1.8;margin-top:13px}
html{scroll-padding-top:0}
.reference-grid{align-items:start}.file-preview-path{font:12px/1.7 var(--mono);color:var(--muted);overflow-wrap:anywhere;margin:8px 0 14px}
.reference-lesson{border-bottom:1px solid var(--border)}.reference-lesson>summary{cursor:pointer;list-style:none;display:block;padding:16px 0;min-height:44px;font-size:14px;line-height:1.65;color:var(--ink)}.reference-lesson>summary::-webkit-details-marker{display:none}.reference-lesson>summary:before{content:'+';float:right;font:18px var(--mono);margin-left:8px;color:var(--accent)}.reference-lesson[open]>summary:before{content:'−'}.reference-lesson>summary small{display:block;margin-top:5px;font-size:12px;color:var(--muted)}.reference-lesson-body>p{font-size:14px;line-height:1.85}.reference-lesson .code-header{flex-wrap:wrap;gap:8px}.reference-lesson .code-header>span{min-width:0;overflow-wrap:anywhere}.reference-lesson pre{font-size:13px;max-height:360px;overflow:auto}.reference-lesson .fine-print{font-size:12px;line-height:1.8}.reference-lesson a{font-size:13px!important;line-height:1.8}
.file-view-tabs{display:flex;gap:6px;border-bottom:1px solid var(--border);margin:12px 0 24px}.file-view-tabs button{min-height:44px;padding:10px 18px;border:0;border-bottom:2px solid transparent;background:transparent;color:var(--muted);font:600 14px var(--sans);cursor:pointer}.file-view-tabs button[aria-selected=true]{border-bottom-color:var(--accent);color:var(--accent)}.file-reading{font-size:16px;line-height:1.85;overflow-wrap:anywhere}.file-reading h2{font-size:28px!important;margin:32px 0 18px!important}.file-reading h3{font-size:22px;margin:28px 0 14px}.file-reading p,.file-reading li{font-size:16px}.file-reading .code-block pre,#file-preview{font-size:13px}.file-reading .guide-table{overflow:auto}.file-dialog .viewer-top h2{overflow-wrap:anywhere;min-width:0}.file-dialog .viewer-top .icon-button{flex-shrink:0}.file-reading a{color:var(--accent);text-decoration:underline;text-underline-offset:3px}
@media(max-width:480px){.file-reading h2{font-size:25px!important}.file-reading .code-header{flex-wrap:wrap;gap:8px}.file-reading .code-block pre{padding:16px}.file-view-tabs button{padding-inline:14px}}
.assessment-resume{padding:20px;margin:24px 0;border:1px solid var(--border);border-left:3px solid var(--accent);border-radius:10px;background:var(--tint)}.assessment-resume h3{font-size:18px;line-height:1.5;margin:12px 0}.assessment-resume .dialog-actions{justify-content:flex-start}.assessment-resume .button{min-height:44px}.assessment-resume #draft-remove-status:empty{display:none}
.lesson-toc{max-height:calc(100dvh - 148px);overflow-y:auto;overscroll-behavior:contain;gap:2px;scrollbar-width:thin}.lesson-toc a{line-height:1.55;padding:6px 0}.lesson-toc>span{margin-bottom:10px}.saved-plan-button{width:100%;justify-content:center;margin-top:16px}.plan-save-status{padding:14px 16px;border-left:2px solid var(--accent);background:var(--tint)}
@media(max-width:1200px){.lesson-toc{max-height:none;overflow:visible;gap:6px 18px;font-size:13px}.lesson-toc a{min-height:44px;display:inline-flex;align-items:center}}
/* Classic desktop scrollbars and the longer Continue label need real room. */
@media(min-width:801px) and (max-width:1000px){.a-nav-inner{width:calc(100% - 40px);gap:16px}.a-brand small{display:none}.header-nav{gap:16px}.a-nav-actions{gap:4px}.a-nav-actions>.a-button{white-space:nowrap}}

/* Keep the question anchored when feedback increases dialog height. */
.assessment-dialog{margin-block:6dvh auto;max-height:88dvh}

/* Put lookup content before long explanatory and topic navigation lists. */
.reference-guidance{font-size:12px;color:var(--muted);line-height:1.8;margin:0 0 14px}
.reference-guidance>p{margin:0 0 6px}.reference-guidance details>p{max-width:760px;margin:10px 0 0}
.reference-guidance summary,.reference-jump>summary{cursor:pointer;color:var(--accent);font-size:12px;font-weight:600;min-height:32px;padding:5px 0}
.reference-jump{margin:0 0 20px}.reference-jump .reference-index{margin:8px 0 16px}
.reference-index a[hidden]{display:none}
.guide-scope>p{font:inherit;line-height:1.8;margin:0}
.translated-guide .guide-scope{font-size:13px!important}
@media(max-width:700px){.reference-heading h1{font-size:34px;margin:12px 0}.reference-heading .source-lead{font-size:15px;line-height:1.65}.reference-toolbar{margin:22px 0 16px}.reference-guidance{font-size:12px}.reference-jump{margin-bottom:16px}.reference-card{padding:22px}}

/* User-requested Claude How-To typography, 2026-10-23. Locally hosted OFL fonts.
   Roles and optical-size settings: https://luongnv.com/claude-howto/assets/landing.css */
.a-hero h1{font-family:var(--display);font-weight:480;font-variation-settings:"opsz" 144;letter-spacing:-.015em;line-height:1.04}
.a-section-top h2,.a-principle h2,.a-reading-note h2,.a-languages h2,.a-first-project h3{font-family:var(--display);font-weight:480;letter-spacing:-.01em}
.a-level-heading h3{font-family:var(--display);font-weight:520;letter-spacing:-.01em}
.a-module h4{font-family:var(--display);font-weight:560;letter-spacing:-.01em}
.source-page>h1,.reference-heading h1{font-family:var(--display);font-weight:480;letter-spacing:-.01em}
/* Focused study follows the existing field-guide type and color tokens. */
.study-page{max-width:54rem;margin:0 auto;padding:clamp(24px,5vw,64px) 24px;line-height:1.65}
.study-page h1{font-size:clamp(2rem,5vw,3.5rem);line-height:1.15}
.study-page h2,.study-page h3{margin-top:1.5em;line-height:1.3}
.study-page label{display:block;font-weight:600;margin-top:1.25rem}
.study-page textarea,.study-page select{display:block;width:100%;max-width:100%;padding:.75rem;border:1px solid currentColor;border-radius:6px;background:var(--bg,#fff);color:var(--text,#17201b);font:inherit}
.study-page textarea{resize:vertical}
.study-page button{padding:.65rem 1rem;margin:.8rem .6rem .8rem 0;border:1px solid currentColor;border-radius:6px;background:transparent;color:inherit;font:inherit;cursor:pointer}
.study-page :is(button,select,textarea,summary,a):focus-visible{outline:3px solid currentColor;outline-offset:4px}
.study-page details{padding:1rem;border:1px solid currentColor;border-radius:6px}
.study-page summary{cursor:pointer;font-weight:600}
.study-answer{white-space:pre-wrap;overflow-wrap:anywhere}
[data-theme="dark"] .study-page :is(textarea,select){background:#17201b;color:#f1f3ee}