/* Reading interface — source content is independent of the presentation. */
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/* Lesson pages: calmer type hierarchy, wider diagrams, a stable reading outline. */
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.reader-outline-button{position:fixed;bottom:18px;right:24px;align-items:center;gap:9px;min-height:44px;padding:10px 17px;background:var(--ink);color:var(--surface);border:1px solid var(--line);border-radius:30px;font-size:12px;z-index:15;box-shadow:0 6px 25px #0003}
.atlas-utility .source-text{font-size:var(--reading);line-height:2;overflow-wrap:anywhere}.atlas-utility .updates-main,.atlas-utility .source-reader{padding-top:36px}.atlas-utility .updates-main h1{font-size:32px;line-height:1.6;letter-spacing:0}.atlas-utility .updated-explanation{background:var(--surface);border-radius:14px}
.atlas-mobile-nav{display:none;position:relative}.atlas-mobile-nav summary{list-style:none;height:36px;width:36px;display:grid;place-items:center;border:1px solid var(--line);border-radius:9px;cursor:pointer}.atlas-mobile-nav summary::-webkit-details-marker{display:none}.atlas-mobile-nav summary svg{width:17px;height:17px}.atlas-mobile-nav nav{position:absolute;right:0;top:47px;width:200px;display:grid;background:var(--surface);border:1px solid var(--line);border-radius:12px;padding:7px;box-shadow:0 15px 50px #0003}.atlas-mobile-nav nav a{font-size:13px;text-decoration:none;padding:11px 14px;border-radius:7px}.atlas-mobile-nav nav a:hover{background:var(--tint)}
.atlas-category{scroll-margin-top:145px}
@media(max-width:900px){.atlas-mobile-nav{display:block}}
@media(max-width:380px){body .atlas-header{padding:0 13px;gap:8px}body .atlas-header .brand{font-size:14px;gap:7px}body .atlas-header .brand small{display:none}body .atlas-header .brandmark{width:27px;height:27px}body .atlas-tools{gap:4px}body .icon-tool#themeButton{min-width:60px}}
.atlas-stage-link{font-size:14px}.atlas-welcome p{font-size:15px}.atlas-search input{font-size:14px}.category-name strong{font-size:15px}.category-name>span{font-size:13px}.lesson-name strong{font-size:14px}.lesson-name>span{font-size:12px}
html[data-ui-large=true] .atlas-stage-link{font-size:15px}html[data-ui-large=true] .atlas-global a{font-size:14px}html[data-ui-large=true] .atlas-welcome p{font-size:17px}html[data-ui-large=true] .category-name strong{font-size:17px}html[data-ui-large=true] .category-name>span{font-size:14px}html[data-ui-large=true] .lesson-name strong{font-size:16px}html[data-ui-large=true] .lesson-name>span{font-size:14px}html[data-ui-large=true] .atlas-search input{font-size:16px}html[data-ui-large=true] .entry-resume strong{font-size:15px}html[data-ui-large=true] .entry-resume #continueContext{font-size:12px}html[data-ui-large=true] .result-topic{font-size:15px}html[data-ui-large=true] .atlas-reader .contents a{font-size:14px}
@media(min-width:1550px){.atlas-library-hero{gap:80px}.atlas-reader .layout{gap:72px}.atlas-reader .reading{max-width:890px}}
@media(max-width:1100px){.atlas-library-layout{grid-template-columns:195px minmax(0,1fr)}.atlas-rail{padding:28px 15px}.atlas-header{padding:0 25px;gap:20px}.atlas-global{gap:17px}.atlas-library-main{padding:32px 30px 45px}.atlas-library-hero{gap:25px;grid-template-columns:minmax(0,1fr) minmax(260px,.9fr)}.atlas-welcome h1{font-size:36px}.atlas-welcome p br{display:none}.entry-start{padding:20px}.entry-start>strong{font-size:17px}.atlas-reader .layout{grid-template-columns:195px minmax(0,1fr);gap:32px;padding:28px 25px}.atlas-chapters{gap:12px}.atlas-category summary{padding:18px 16px}}
@media(max-width:900px){.atlas-global{display:none}.atlas-library-layout{display:block}.atlas-rail{display:none}.atlas-library-main{max-width:900px;padding:32px 30px 45px}.atlas-library-hero{grid-template-columns:minmax(0,1fr) minmax(265px,.8fr)}.atlas-reader .layout{display:block;padding:26px 28px 85px}.atlas-reader .sidebar{display:none}.atlas-reader .mobile-toc{display:none}.reader-outline-button{position:fixed;bottom:18px;right:24px;display:flex;align-items:center;gap:9px;min-height:44px;padding:10px 17px;background:var(--ink);color:var(--surface);border:1px solid var(--line);border-radius:30px;font-size:12px;z-index:15;box-shadow:0 6px 25px #0003}.reader-outline-button svg{width:17px;height:17px}.focus-tool{display:none}.atlas-reader .reading{max-width:800px}.atlas-reader .intro{font-size:18px}.atlas-reader .hero h1{font-size:35px}}
@media(max-width:600px){html{scroll-padding-top:88px}.atlas-header{height:68px;padding:0 18px;gap:12px}.atlas-header .brand{font-size:16px;gap:9px}.atlas-header .brand small{font-size:8px;margin-top:3px}.atlas-header .brandmark{width:31px;height:31px;border-radius:9px}.brandmark svg{width:20px;height:20px}.atlas-tools{gap:5px}.icon-tool{height:35px;min-width:35px;padding:6px 8px;font-size:10px}.icon-tool#themeButton{min-width:66px}.progress{top:67px}.atlas-library-main{padding:28px 19px 35px}.atlas-library-hero{display:block;margin-bottom:18px}.atlas-welcome h1{font-size:35px;line-height:1.4;margin:10px 0 13px}.atlas-welcome p{font-size:13px}.atlas-counts{margin:20px 0 25px;gap:20px}.atlas-counts strong{font-size:17px}.atlas-entry{gap:10px}.entry-start{padding:18px 20px}.entry-start>strong{font-size:17px}.entry-action{margin-top:15px}.entry-resume{padding:14px 18px}.atlas-find{top:68px;padding:17px 0 10px}.find-heading{margin-bottom:10px}.find-heading h2{font-size:17px}.find-heading>span{display:none}.atlas-find-controls{flex-wrap:wrap;gap:9px}.atlas-search{width:100%;flex-basis:100%;height:48px}.atlas-search kbd{display:none}.atlas-stage-select{width:100%}.atlas-stage-select select{max-width:none;height:42px;font-size:12px}.atlas-search-state{font-size:10px;margin-top:7px}.atlas-chapters{grid-template-columns:1fr;gap:11px}.atlas-shelf{margin:28px 0 38px;scroll-margin-top:275px}.atlas-shelf-title{gap:13px;margin-bottom:17px}.shelf-number{width:33px;height:33px;font-size:11px;border-radius:9px}.atlas-shelf-title h2{font-size:21px;margin:4px 0 7px}.atlas-shelf-title h2 small{font-size:10px;display:block;margin-left:0;margin-top:2px}.atlas-shelf-title p{font-size:11px}.atlas-category summary{padding:19px 18px}.category-name strong{font-size:14px}.atlas-library-footer{display:block;font-size:10px}.atlas-library-footer a{margin-top:12px}.atlas-result-card{padding:18px}.result-lesson{font-size:15px}.result-topic{font-size:12px;overflow-wrap:anywhere}.atlas-reader .layout{padding:23px 19px 85px}.reader-route{font-size:10px;gap:12px;margin-bottom:22px}.reader-route>span{display:none}.atlas-reader .chapter-label{font-size:10px;line-height:1.9}.atlas-reader .hero h1{font-size:30px}.atlas-reader .thai-title{font-size:20px;margin-bottom:16px}.atlas-reader .intro{font-size:17px;line-height:1.95}.atlas-reader .hero{padding-bottom:27px}.atlas-reader .meta{font-size:9px;gap:7px}.atlas-reader .prereq{font-size:11px;padding:13px 15px}.atlas-reader .chapter h2{font-size:24px}.atlas-reader .chapter h2 small{font-size:11px}.atlas-reader .chapter p,.atlas-reader .topic-text{font-size:calc(var(--reading) - 1px)}.atlas-reader section.chapter{padding:35px 0}.atlas-reader .worked-explanation{padding:16px 18px!important}.atlas-reader .figure{padding:18px}.atlas-reader .rich-figure,.atlas-reader .walk-figure{padding:20px 15px}.reader-outline-button{right:18px;bottom:15px}.atlas-reader .term-dialog{bottom:76px;right:14px;width:calc(100% - 28px)}.atlas-reader .booknav{grid-template-columns:1fr}.atlas-reader[data-focus=true] .layout{padding:23px 19px 85px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*{transition:none!important}}
@media print{.atlas-header,.atlas-rail,.reader-route,.reader-outline-button,.reader-resume{display:none!important}.atlas-reader .layout{display:block;padding:0}.atlas-reader .reading{max-width:none}.atlas-library-layout{display:block}.atlas-category{break-inside:avoid}.atlas-find{position:static}}