/* Shared sizing and interaction layer. Source and learning content are unchanged. */
:root{--page-gutter:clamp(18px,3.1vw,52px);--section-gap:clamp(24px,3vw,44px);--sidebar:252px}
html{scroll-padding-top:calc(var(--top) + 24px)}
.topbar{padding-inline:clamp(16px,2.5vw,40px);gap:16px}.top-actions{gap:14px;flex-shrink:0}.brand{min-width:0}.search-trigger{min-height:44px;justify-content:center}.chapters-trigger{display:none;align-items:center;justify-content:center;gap:10px;min-height:44px;padding:8px 13px;border:1px solid var(--line);border-radius:6px;color:var(--muted);font-size:12px}.chapters-trigger>span:first-child{font-size:18px}
.library,.reading,.file-view{width:100%;max-width:1480px;margin-inline:auto;padding:clamp(28px,3.8vw,56px) var(--page-gutter) 72px}.hero{gap:32px;margin-block:var(--section-gap)}.hero h1{font-size:clamp(38px,4.3vw,64px);line-height:1.12}.hero p{font-size:15px;line-height:1.8}.hero-actions{flex-wrap:wrap;gap:16px}.primary-button{min-height:44px;font-size:13px}.subtle-link{min-height:44px;display:inline-flex;align-items:center}.metrics{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:20px;margin-bottom:var(--section-gap);padding-block:22px}.metric{display:block;min-width:0}.metric strong{font-size:24px}.metric span{display:block;font-size:12px;margin-top:4px}.section-title{gap:16px;align-items:baseline}.section-title h2{font-size:clamp(20px,2vw,25px)}.section-title>span{flex-shrink:0}.filters{gap:8px;align-items:stretch}.filter{min-height:42px;padding:9px 13px;font-size:12px}.library-filter{min-height:42px;font-size:14px;max-width:230px;min-width:0}.chapter-grid{grid-template-columns:repeat(auto-fit,minmax(min(100%,240px),1fr));gap:clamp(16px,1.8vw,24px)}.chapter-card{padding:clamp(20px,2vw,28px);min-height:280px}.chapter-card h3{font-size:19px;line-height:1.4}.chapter-card p{font-size:13px;line-height:1.75}.card-top{margin-bottom:24px}.tag{font-size:11px;padding:3px 8px}.card-bottom{font-size:10px;margin-top:22px}.library-footer{flex-wrap:wrap;gap:16px;font-size:12px}
.reader-bar{gap:16px;margin-bottom:32px;align-items:flex-start}.reader-buttons{gap:8px}.small-button{min-height:40px;font-size:12px;justify-content:center}.reader-title{font-size:clamp(34px,3.8vw,52px);line-height:1.18;margin-block:16px}.reader-deck{font-size:15px;line-height:1.8;max-width:72ch}.reader-meta{flex-wrap:wrap;gap:12px 22px;margin-block:24px}.reader-layout{grid-template-columns:minmax(0,82ch) minmax(170px,220px);gap:clamp(28px,4vw,56px);justify-content:center;align-items:start}.article{font-size:15px;line-height:1.85}.article h2{font-size:clamp(23px,2.2vw,29px);margin-top:48px;padding-top:32px}.article h3{font-size:21px}.article p{margin-block:18px}.article li{margin-block:9px}.article table{font-size:13px}.toc{top:calc(var(--top) + 28px);max-height:calc(100dvh - var(--top) - 56px);font-size:12px;padding-left:22px}.toc a{padding-block:9px}.toc-mobile{font-size:13px}.toc-mobile summary{padding-block:3px}.toc-mobile nav{gap:4px}.toc-mobile nav a{display:block;padding:8px 0}.sidebar{height:calc(100dvh - var(--top));padding-top:28px}.chapter-link{white-space:normal;min-height:42px;font-size:12px;line-height:1.5}.chapter-number{flex-shrink:0}.chapter-pagination a{padding:12px 0;font-size:14px}.resource-filter{min-height:44px;font-size:15px}.resource-list li{padding-block:13px;font-size:12px;gap:20px}.resource-size{flex-shrink:0}.file-pagination{flex-wrap:wrap}.file-view pre{max-width:100%;min-width:0}.file-title{font-size:clamp(22px,2.2vw,32px)}
.learning-studio{container:studio / inline-size;margin-block:32px 48px;border-radius:12px}.studio-intro{padding:clamp(22px,3vw,36px);gap:24px}.studio-intro h2{font-size:clamp(24px,2.7vw,36px);max-width:32ch}.studio-intro p{font-size:15px;line-height:1.8;max-width:75ch}.learning-studio [role=tabpanel]{padding:clamp(20px,2.5vw,32px)}.studio-tabs button{min-height:64px;padding:18px 20px}.studio-tabs button span{font-size:14px}.flow-header{gap:16px;flex-wrap:wrap;font-size:10px;line-height:1.8}.flow-track{grid-template-columns:repeat(6,minmax(0,1fr));gap:12px}.flow-node{min-width:0;padding:16px 13px;min-height:145px;transform:none}.flow-node strong{font-size:13px;overflow-wrap:anywhere}.flow-node.is-current{transform:none;box-shadow:inset 0 0 0 1px #b7dfcd33}.step-explanation{grid-template-columns:52px minmax(0,1.5fr) minmax(0,1fr);gap:24px;padding:26px;min-height:0}.step-explanation>div{min-width:0}.step-explanation h3{font-size:23px}.step-explanation p{font-size:14px;line-height:1.85}.decision-note{grid-column:auto;border-top:0;border-left:1px solid #38413e;padding:0 0 0 24px}.decision-note p{font-size:13px}.flow-footer{gap:12px;margin-block:20px 28px}.flow-footer .small-button{min-height:44px}.learn-term{min-height:38px;font-size:12px;gap:10px;max-width:100%;overflow-wrap:anywhere}.map-intro h3{font-size:25px}.map-intro p{font-size:14px}.map-progress,.dictionary-count{white-space:normal}.concept-map{grid-template-columns:minmax(0,1fr) minmax(0,2fr);gap:42px}.map-branch{flex-direction:row;flex-wrap:wrap;gap:14px;padding:16px;min-width:0}.map-branch label{font-size:14px;min-width:0;flex:1 1 160px;min-height:32px}.map-branch small{font-size:11px}.map-source nav{grid-template-columns:repeat(2,minmax(0,1fr))}.map-source a{font-size:12px;min-height:44px;overflow-wrap:anywhere;align-items:center}.dictionary-results{grid-template-columns:repeat(2,minmax(0,1fr));gap:16px;max-height:min(600px,65dvh);overscroll-behavior:contain;scrollbar-gutter:stable}.dictionary-entry{padding:20px;min-width:0}.dictionary-entry p{font-size:14px}.dictionary-label{font-size:13px}.chapter-terms{gap:10px}.studio-note{padding:16px 28px;font-size:11px;line-height:1.8}.learning-path{padding:clamp(22px,2.5vw,32px);gap:28px}.learning-path p{font-size:14px;line-height:1.8}.learning-path nav a{min-height:44px;font-size:12px}.term-card{max-height:calc(100dvh - 24px);overscroll-behavior:contain}.term-card-top button{min-height:40px;min-width:40px}.term-card p{font-size:14px}.back-to-top{width:44px;height:44px;bottom:calc(18px + env(safe-area-inset-bottom));right:18px}.search-dialog{max-height:calc(100dvh - 32px)}.search-heading{padding:18px 20px}.icon-button{min-width:44px;min-height:44px}.search-foot{flex-wrap:wrap}#toast{max-width:calc(100vw - 32px);text-align:center;bottom:calc(24px + env(safe-area-inset-bottom))}
.chapters-dialog{width:min(380px,calc(100vw - 24px));height:100dvh;max-height:100dvh;max-width:none;margin:0 0 0 auto;padding:24px 20px calc(24px + env(safe-area-inset-bottom));border:0;border-left:1px solid #48414f;background:var(--panel);color:var(--text);overflow:auto;overscroll-behavior:contain}.chapters-dialog::backdrop{background:#0009;backdrop-filter:blur(4px)}.chapters-heading{display:flex;align-items:center;justify-content:space-between;gap:20px;margin-bottom:22px}.chapters-heading h2{font-size:23px;font-weight:500;letter-spacing:-.6px;margin:8px 0 0}.drawer-home,.drawer-resources{display:flex;align-items:center;min-height:48px;padding:10px 12px;color:var(--accent);font-size:14px}.drawer-home{border:1px solid var(--line);border-radius:6px;margin-bottom:16px}.drawer-resources{border-top:1px solid var(--line);margin-top:18px}#mobile-chapter-nav{display:grid;gap:5px}#mobile-chapter-nav .chapter-link{min-height:46px;font-size:14px;padding:10px 12px}.chapters-trigger:hover,.chapters-trigger[aria-expanded=true]{border-color:var(--accent);color:var(--accent)}.chapters-dialog[open]{animation:drawer-enter .18s ease-out}@keyframes drawer-enter{from{opacity:.5;transform:translateX(24px)}to{opacity:1;transform:none}}
@container studio (max-width:950px){.flow-track{grid-template-columns:repeat(3,minmax(0,1fr))}.flow-track:before{display:none}.step-explanation{grid-template-columns:44px minmax(0,1fr)}.decision-note{grid-column:2;border-left:0;border-top:1px solid #38413e;padding:18px 0 0}.studio-badge{display:none}.concept-map{grid-template-columns:1fr;gap:24px}.map-root:after{left:20px;top:100%;width:1px;height:24px}.map-branches{margin-left:20px}.map-intro{align-items:flex-start;flex-wrap:wrap}.studio-intro h2{max-width:34ch}}
@container studio (max-width:560px){.flow-track{grid-template-columns:repeat(2,minmax(0,1fr));gap:10px}.flow-node{min-height:132px}.studio-tabs button{padding:13px 10px;min-width:0}.studio-tabs button span{display:block;margin:7px 0 0;font-size:12px;line-height:1.5}.step-explanation{grid-template-columns:1fr;padding:20px;gap:16px}.step-number{display:flex;align-items:center;gap:12px;font-size:28px}.step-number small{margin:0}.decision-note{grid-column:1}.step-explanation h3{font-size:22px}.map-source nav,.dictionary-results{grid-template-columns:1fr}.map-root{padding:20px;font-size:22px}.map-intro h3{font-size:23px}.map-intro p{font-size:14px}.studio-note{padding:16px 20px}.flow-header{font-size:9px;letter-spacing:.3px}.map-branch{padding:14px;gap:12px}.map-branch label{flex-basis:100%}}
@media(max-width:1100px){:root{--sidebar:0px;--top:68px;--page-gutter:clamp(20px,4vw,40px)}.layout{display:block}.sidebar{display:none}.chapters-trigger{display:inline-flex}.edition{display:none}.reader-layout{grid-template-columns:minmax(0,82ch)}.toc{display:none}.toc-mobile{display:block;border:1px solid var(--line);padding:12px 16px;border-radius:6px;margin-block:24px}.toc-mobile nav{display:grid}.hero{grid-template-columns:minmax(0,1fr) 240px}.hero-diagram{display:block;width:240px}.library,.reading,.file-view{max-width:1200px}.chapter-grid{grid-template-columns:repeat(auto-fit,minmax(min(100%,245px),1fr))}}
@media(max-width:760px){.hero{grid-template-columns:1fr}.hero-diagram{display:none}.brand-sub{font-size:12px}.brand-divider{margin-inline:9px}.metrics{grid-template-columns:repeat(2,minmax(0,1fr));gap:20px 28px}.learning-path{grid-template-columns:1fr}.learning-path p{max-width:65ch}.reader-bar{flex-direction:column}.reader-buttons{width:100%}.reader-layout{display:block}.article{font-size:16px}.library-filter{max-width:none;margin-left:0;flex-basis:100%;width:100%}.search-dialog{margin:16px auto auto;max-height:calc(100dvh - 32px)}#search-results{max-height:55dvh}.section-title{align-items:flex-start;flex-wrap:wrap}.section-title h2{max-width:25ch}.chapters-trigger-label{display:none}.chapters-trigger,.search-trigger{width:44px;padding:8px}.search-trigger{font-size:0;gap:0}.search-trigger kbd{display:none}.top-actions{gap:8px}.hero p br{display:none}}
@media(max-width:480px){:root{--top:64px;--page-gutter:18px}.topbar{padding-inline:14px}.brand{font-size:17px;gap:10px}.brand-sub,.brand-divider{display:none}.brand-mark{flex-shrink:0}.hero h1{font-size:clamp(36px,10vw,46px);letter-spacing:-1.5px}.hero-actions{align-items:stretch;flex-direction:column;gap:8px}.hero-actions .primary-button{justify-content:space-between}.hero-actions .subtle-link{justify-content:center}.library,.reading,.file-view{padding-block:26px 64px}.chapter-grid{grid-template-columns:1fr}.chapter-card{min-height:260px}.reader-buttons{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:8px}.reader-buttons .small-button{padding:9px 8px;font-size:11px;min-width:0}.reader-buttons>:last-child:nth-child(odd){grid-column:1 / -1}.reader-meta{font-size:10px;gap:10px 16px}.studio-intro{padding:24px 20px}.studio-intro h2{font-size:25px;letter-spacing:-.6px}.studio-intro p{font-size:15px}.learning-studio [role=tabpanel]{padding:20px 16px}.learning-studio{margin-top:24px}.flow-footer{gap:8px}.flow-footer .small-button{font-size:11px;padding:9px}.learning-path nav{grid-template-columns:1fr}.library-footer{font-size:11px}.resource-list li{flex-wrap:wrap;gap:4px}.resource-list a{flex-basis:100%}.chapter-pagination{gap:20px}.chapter-pagination a{font-size:13px}.article h1{font-size:25px}.article h3{font-size:20px}.article table{font-size:12px}.article blockquote{padding-inline:14px}.dictionary-results{max-height:65dvh}.map-branches{padding-left:14px;margin-left:14px}.map-line{width:15px}.source-notice{padding:12px;font-size:13px}.search-foot{font-size:11px}.search-dialog input{font-size:16px}.back-to-top{right:12px}}
@media(hover:hover) and (prefers-reduced-motion:no-preference){.small-button,.learn-term,.filter,.chapter-link,.chapters-trigger{transition:background-color .15s,border-color .15s,color .15s}.chapter-card:hover{transform:translateY(-3px)}}
@media(hover:none){.chapter-card:hover{transform:none}.filter:active,.small-button:active,.flow-node:active{background:#c8b5fb15}}
@media(prefers-reduced-motion:reduce){.chapters-dialog[open]{animation:none}}

body:has(.chapters-dialog[open]){overflow:hidden}.learn-term{min-height:44px}
.hero-diagram .diagram-caption{inset-inline:0;width:auto}.hero-diagram svg{display:block}
#mobile-chapter-nav .chapter-number{color:#b1b2be}.chapters-dialog[open]{animation-name:drawer-slide}
@keyframes drawer-slide{from{transform:translateX(24px)}to{transform:none}}
.diagram-toolbar{flex-wrap:wrap;row-gap:8px}.diagram-actions{flex-wrap:wrap;max-width:100%}
@media(pointer:coarse){.diagram-actions button{min-width:40px;min-height:40px;height:auto}}
.lesson-evidence{border:1px solid var(--line);border-radius:6px;margin:20px 0;padding:0 16px;color:var(--muted)}.lesson-evidence>summary{cursor:pointer;min-height:44px;display:list-item;padding:10px 0;color:var(--accent);font-size:13px}.lesson-evidence blockquote{margin:0 0 16px;border:0;padding:0;background:none;font-size:13px;line-height:1.8}