:root{color-scheme:light;--bg:#f7f8fa;--panel:#fff;--text:#142632;--muted:#647582;--line:#e1e8ec;--accent:#087e80;--accent-bg:#e3f4f3;--amber:#f3b94f;--amber-bg:#fff3d7;--shadow:0 8px 24px #172b3a08;--danger:#a82e36;--code:#f0f3f5}
:root[data-theme=dark]{color-scheme:dark;--bg:#10171d;--panel:#17232c;--text:#e5edf2;--muted:#a1b2be;--line:#2b3c48;--accent:#56d2c5;--accent-bg:#183c3c;--amber:#f4c56f;--amber-bg:#3b3020;--shadow:none;--danger:#ff9eaa;--code:#101c25}
*{box-sizing:border-box}body{margin:0;background:var(--bg);color:var(--text);font:15px/1.7 'Noto Sans Thai',Tahoma,system-ui,sans-serif}button,input,textarea,select{font:inherit}button,a,input,textarea,select{-webkit-tap-highlight-color:transparent}button{cursor:pointer}button:disabled{opacity:.45;cursor:not-allowed}a{color:var(--accent)}button:focus-visible,a:focus-visible,input:focus-visible,textarea:focus-visible,select:focus-visible{outline:3px solid var(--amber);outline-offset:3px}h1,h2,h3,p{margin:0}h1{font-size:32px;line-height:1.4;letter-spacing:-.5px}h2{font-size:21px}h3{font-size:17px}svg{width:20px;height:20px;flex-shrink:0;stroke-width:1.75}button svg{pointer-events:none}button{color:var(--text)}.shell{display:grid;grid-template-columns:256px 1fr;min-height:100vh}.sidebar{position:fixed;inset:0 auto 0 0;width:256px;background:var(--panel);border-right:1px solid var(--line);display:flex;flex-direction:column;z-index:30;padding:24px 15px}.brand{display:flex;align-items:center;gap:10px;font-size:21px;font-weight:700;letter-spacing:.3px;padding:0 12px 25px}.brand svg{color:var(--accent);width:25px;height:25px}.course-code{font-size:11px;letter-spacing:1px;color:var(--muted);padding:0 13px 17px}.nav{display:flex;align-items:center;gap:12px;padding:10px 12px;border:0;background:none;width:100%;text-decoration:none;border-radius:8px;color:var(--muted);text-align:left}.nav.active{background:var(--accent-bg);color:var(--accent);font-weight:600}.nav:hover{background:var(--accent-bg)}.term-list{overflow:auto;margin-top:22px;border-top:1px solid var(--line);padding-top:12px}.term-list summary{list-style:none;cursor:pointer;display:flex;align-items:center;justify-content:space-between;font-weight:600;padding:10px 12px}.term-list summary::after{content:'−';color:var(--muted)}.term-list details:not([open]) summary::after{content:'+'}.lesson-link{display:block;border:0;background:none;font-size:13px;padding:8px 12px 8px 38px;width:100%;text-align:left;border-radius:6px;color:var(--muted)}.lesson-link.active{background:var(--accent-bg);color:var(--accent);font-weight:600}.side-footer{margin-top:auto;padding-top:16px}.workspace{grid-column:2;min-width:0}.topbar{height:76px;border-bottom:1px solid var(--line);background:var(--panel);display:flex;align-items:center;justify-content:space-between;gap:16px;padding:0 40px;position:sticky;top:0;z-index:10}.topbar .crumb{font-size:13px;color:var(--muted)}.tools{display:flex;align-items:center;gap:12px}.icon-button{border:1px solid var(--line);background:var(--panel);border-radius:8px;display:grid;place-items:center;padding:9px;width:39px;height:39px}.search{display:flex;align-items:center;gap:8px;color:var(--muted);background:var(--bg);border:1px solid var(--line);border-radius:8px;padding:6px 12px}.search 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var(--line);background:var(--bg);border-radius:10px;padding:15px 20px;font-weight:600}.map-node svg{color:var(--accent);width:26px;height:26px}.map-node.focus{border-color:var(--accent);background:var(--accent-bg)}.map-secondary{margin-top:22px;padding-top:22px;border-top:1px dashed var(--line)}.map-arrow{color:var(--muted);font-size:23px}.group-title{display:flex;align-items:center;gap:9px;margin:28px 0 12px}.groups{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px}.group{border:1px solid var(--line);border-radius:11px;background:var(--panel);padding:18px 20px}.group h3{margin-bottom:12px}.row-link{display:flex;align-items:center;justify-content:space-between;gap:10px;border:0;border-top:1px solid var(--line);padding:12px 0;width:100%;text-align:left;background:none;font-size:14px}.row-link span{flex:1}.row-link small{font-size:11px;color:var(--muted)}.row-link svg{width:15px;height:15px;color:var(--muted)}.tabs{display:flex;gap:4px;border-bottom:1px solid 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12px;border-radius:7px;min-width:0}label{font-size:13px;color:var(--muted)}.sim-log{margin-top:16px;color:var(--muted);font-size:13px;min-height:24px}.bit-grid{display:flex;gap:7px;justify-content:center;flex-wrap:wrap}.bit{font:25px Consolas,monospace;border:1px solid var(--line);border-radius:7px;background:var(--code);padding:12px}.bit.on{background:var(--accent-bg);color:var(--accent)}.bytes{display:flex;justify-content:center;gap:7px}.byte{padding:15px;background:var(--amber-bg);border:1px solid var(--amber);font:20px Consolas,monospace;border-radius:7px}.flags{display:grid;grid-template-columns:repeat(4,1fr);gap:9px}.flag{padding:17px 7px;text-align:center;background:var(--code);border:1px solid var(--line);border-radius:8px;font-family:Consolas,monospace}.flag.on{background:var(--amber-bg);border-color:var(--amber)}.bar-chart{display:flex;align-items:flex-end;justify-content:center;height:180px;gap:9px}.sort-bar{height:var(--height);width:42px;background:var(--accent-bg);border:1px solid var(--accent);border-radius:5px 5px 0 0;display:flex;align-items:flex-end;justify-content:center;padding:8px}.sort-bar.selected{background:var(--amber-bg);border-color:var(--amber)}.heap-nodes{display:flex;gap:8px;flex-wrap:wrap;justify-content:center}.heap-node{border:1px solid var(--accent);padding:15px;background:var(--accent-bg);border-radius:7px}.heap-node.freed{border-style:dashed;color:var(--muted);background:var(--bg)}.quiz-list{display:grid;gap:20px}.question{border:1px solid var(--line);background:var(--panel);border-radius:10px;padding:24px}.question h3{margin-bottom:18px}.option{display:flex;align-items:center;gap:12px;border:1px solid var(--line);border-radius:8px;padding:12px 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20px;background:var(--text);color:var(--panel);border-radius:8px;z-index:70;display:none;max-width:90vw}.mobile-menu{display:none}.scrim{display:none}.admin-grid{display:grid;grid-template-columns:230px 1fr;gap:22px}.editor-field{display:grid;gap:6px;margin-bottom:17px}.editor-field textarea{width:100%;resize:vertical;min-height:95px}.editor-field input,.editor-field select{width:100%}.editor-block{padding:18px;border:1px solid var(--line);border-radius:8px;margin-bottom:14px}.editor-actions{position:sticky;bottom:0;background:var(--panel);padding:14px;display:flex;gap:10px;border:1px solid var(--line);border-radius:8px}.user-row{padding:18px;border-bottom:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;gap:15px}.error{color:var(--danger)}.empty{padding:40px;text-align:center;color:var(--muted)}.filter-row{display:flex;gap:10px;margin-bottom:22px;flex-wrap:wrap}.loading{padding:40px}.icon-button:hover,.btn:hover{filter:brightness(.97)}
@media(min-width:1500px){.content{padding-top:45px}.lesson-grid{gap:35px}}
@media(max-width:1100px){.sidebar{width:230px}.shell{grid-template-columns:230px 1fr}.content{padding:28px}.topbar{padding:0 28px}.lesson-grid{grid-template-columns:1fr}.lesson-aside{display:none}.groups{gap:12px}.map-node{padding:13px}.search input{width:135px}}
@media(max-width:760px){.shell{display:block}.sidebar{transform:translateX(-100%);transition:transform .18s;width:280px}.sidebar.open{transform:none}.scrim.visible{display:block;position:fixed;inset:0;background:#0007;z-index:25}.mobile-menu{display:grid}.topbar{height:65px;padding:0 17px}.topbar .crumb{font-size:12px;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;max-width:140px}.tools{gap:8px}.search{padding:5px 8px}.search input{width:80px;font-size:12px}.search svg{display:none}.content{padding:25px 17px 40px}h1{font-size:26px}.heading{gap:10px}.eyebrow{font-size:11px}.groups{grid-template-columns:1fr}.overview-map{padding:20px 12px}.map-row{gap:8px}.map-node{font-size:12px;padding:12px 9px;gap:6px}.map-node svg{width:18px;height:18px}.map-arrow{font-size:18px}.map-secondary{margin-top:17px;padding-top:17px}.tabs{gap:0;overflow:auto}.tab{padding:11px 14px;white-space:nowrap}.article{padding:22px}.simulation{padding:18px}.sim-body{grid-template-columns:1fr;gap:18px}.stack-view{padding:5px}.controls{gap:7px}.controls .btn{padding:9px 13px}.flags{gap:5px}.question{padding:19px}.admin-grid{grid-template-columns:1fr}.admin-grid>aside{max-height:150px;overflow:auto}.user-row{flex-wrap:wrap}.auth-screen{margin:10vh 18px}.preview-tag{display:none}.avatar{display:none}}
/* Motion reference: fade + slide, press feedback and focus highlight (TakayuStudio). */
.lesson-link{text-decoration:none}.concept-diagram{padding:22px 12px;margin-bottom:25px;border-bottom:1px solid var(--line)}.concept-diagram .map-node{font-size:12px;padding:10px 12px}.concept-diagram .map-row{gap:9px}
.route-enter{animation:content-in 220ms cubic-bezier(.22,1,.36,1) both}
.btn,.icon-button,.map-node,.row-link,.nav,.lesson-link{transition:background-color 160ms ease,color 160ms ease,border-color 160ms ease,transform 140ms cubic-bezier(.22,1,.36,1)}
.btn:active,.icon-button:active,.map-node:active{transform:scale(.98)}
.map-node:hover{border-color:var(--accent);transform:translateY(-2px)}
.stack-slot.top,.flag.on{animation:state-focus 240ms cubic-bezier(.22,1,.36,1)}
.explanation{animation:content-in 180ms cubic-bezier(.22,1,.36,1)}
@keyframes content-in{from{opacity:0;transform:translateY(6px)}to{opacity:1;transform:translateY(0)}}
@keyframes state-focus{from{opacity:.65;transform:translateY(-5px)}to{opacity:1;transform:translateY(0)}}
@media(prefers-reduced-motion:reduce){*{animation:none!important;transition:none!important;scroll-behavior:auto!important}}

/* Reading layout: continuous lessons, restrained documentation chrome. */
.course-hub .term-list,.course-hub .course-code,.course-hub .sidebar nav>a:not([href="#courses"]){display:none}
.page-toc button.active{color:var(--text);font-weight:600}.search-results{max-width:850px}.search-result{display:flex;flex-direction:column;gap:5px;text-align:left;padding:22px 0;width:100%;background:none;color:var(--text);border:0;border-top:1px solid var(--line)}.search-result strong{font-size:19px;color:var(--accent)}.search-result>span:last-child{font-size:14px;color:var(--muted)}
@font-face{font-family:LearningSans;src:url('/fonts/latin-400.woff2') format('woff2');font-weight:400;font-display:swap;unicode-range:U+0000-00FF}
@font-face{font-family:LearningSans;src:url('/fonts/latin-500.woff2') format('woff2');font-weight:500;font-display:swap;unicode-range:U+0000-00FF}
@font-face{font-family:LearningSans;src:url('/fonts/latin-600.woff2') format('woff2');font-weight:600;font-display:swap;unicode-range:U+0000-00FF}
@font-face{font-family:LearningSans;src:url('/fonts/latin-700.woff2') format('woff2');font-weight:700;font-display:swap;unicode-range:U+0000-00FF}
@font-face{font-family:LearningSans;src:url('/fonts/thai-400.woff2') format('woff2');font-weight:400;font-display:swap;unicode-range:U+0E00-0E7F}
@font-face{font-family:LearningSans;src:url('/fonts/thai-500.woff2') format('woff2');font-weight:500;font-display:swap;unicode-range:U+0E00-0E7F}
@font-face{font-family:LearningSans;src:url('/fonts/thai-600.woff2') format('woff2');font-weight:600;font-display:swap;unicode-range:U+0E00-0E7F}
@font-face{font-family:LearningSans;src:url('/fonts/thai-700.woff2') format('woff2');font-weight:700;font-display:swap;unicode-range:U+0E00-0E7F}
:root{--bg:#fff;--panel:#fff;--text:#18212d;--muted:#566273;--line:#e2e5eb;--accent:#285da3;--accent-bg:#f0f4f9;--amber:#bd841d;--amber-bg:#fff7e6;--code:#f6f7f9}
:root[data-theme=dark]{--bg:#080c15;--panel:#080c15;--text:#ecedf1;--muted:#b8bcc7;--line:#252d3d;--accent:#8ac5ff;--accent-bg:#141c2b;--amber:#d8ad60;--amber-bg:#292314;--code:#0e1420}
body{font:16px/1.85 LearningSans,system-ui,sans-serif;letter-spacing:0}.shell{grid-template-columns:276px 1fr}.workspace{padding-top:72px}.sidebar{top:72px;width:276px;padding:21px 19px 18px}.sidebar>.brand{display:none}.course-code{font-size:12px;letter-spacing:0;margin-bottom:5px}.topbar{position:fixed;inset:0 0 auto 0;height:72px;padding:0 25px;display:grid;grid-template-columns:250px 1fr auto;gap:22px;background:var(--bg);border-bottom:1px solid var(--line)}.header-brand{display:flex;align-items:center;gap:11px;text-decoration:none;font-size:22px;color:var(--text);letter-spacing:-.5px}.header-brand svg{color:var(--accent);width:30px;height:30px}.crumb{opacity:.85}.search{width:245px;background:var(--code);padding:7px 12px}.search input{width:100%;font-size:13px}.icon-button{border:0;background:transparent}.nav{padding:7px 10px;border-radius:5px;font-size:14px;gap:10px}.nav svg{width:17px;height:17px}.nav.active,.lesson-link.active{background:var(--text);color:var(--bg)}.nav:hover:not(.active){background:var(--code)}.term-list{margin-top:20px;border-top:0;padding-top:0}.term-list summary{font-size:16px;padding:11px 8px}.lesson-link{font-size:13px;line-height:1.55;padding:8px 10px 8px 18px;margin-left:8px;width:calc(100% - 8px);border-left:1px solid var(--line);border-radius:0}.lesson-link.active{border-radius:5px;border-left-color:transparent}.lesson-link:hover:not(.active){background:var(--code)}.content{max-width:1240px;padding:39px 48px 65px}.heading{margin-bottom:28px}h1{font-size:36px;font-weight:700;letter-spacing:-.65px}h2{font-size:25px;font-weight:600;letter-spacing:-.35px}h3{font-size:18px}.eyebrow{font-size:12px;color:var(--muted)}.overview-map{background:transparent;border-radius:7px;margin-bottom:40px}.map-node{background:var(--code);border-radius:5px;font-size:14px}.groups{gap:28px 44px}.group{border:0;border-top:1px solid var(--line);border-radius:0;background:transparent;padding:18px 0 0;box-shadow:none}.group h3{font-size:18px}.row-link{border-top:0;padding:8px 0;font-size:14px}.row-link small{font-size:10px}.badge{border-radius:4px;background:var(--code);color:var(--muted)}.reading-layout{display:grid;grid-template-columns:minmax(0,760px) 190px;gap:48px;justify-content:center}.reading{min-width:0}.reading-heading{padding-bottom:26px}.reading-section{padding-top:26px;margin-bottom:21px;scroll-margin-top:90px}.reading-section h2{margin:0 0 13px}.reading-section p{font-size:16px;line-height:1.95;color:var(--text);margin:0 0 17px}.reading-section pre{line-height:1.85}.reading .concept-diagram{margin:0 0 8px;padding:24px 16px;border:1px solid var(--line);border-radius:5px;background:var(--code)}.concept-diagram .map-node{background:var(--bg)}.page-toc{position:sticky;top:110px;align-self:start;border-left:1px solid var(--line);padding-left:19px;font-size:12px}.page-toc h3{font-size:13px;margin-bottom:12px}.page-toc button{display:block;background:none;border:0;text-align:left;color:var(--muted);font-size:12px;line-height:1.65;padding:6px 0}.page-toc button:hover{color:var(--accent)}.page-toc a{display:flex;align-items:center;gap:5px;margin-top:14px}.page-toc a svg{width:13px}.simulation{border-radius:6px;padding:24px;background:var(--bg)}.simulation h2{font-size:21px}.question{border-radius:5px;padding:23px;background:var(--bg)}.question h3{font-size:17px;line-height:1.6}.option{border-radius:5px}.article{background:transparent;border-radius:5px}.page-turn{margin-top:50px;padding-top:24px;border-top:1px solid var(--line);display:flex;justify-content:space-between;gap:28px}.page-turn a{display:flex;align-items:center;gap:8px;font-size:14px;text-decoration:none}.page-turn .next{text-align:right;margin-left:auto}.page-turn .prev{max-width:45%}.page-turn .next{max-width:45%}.reading details>summary{cursor:pointer;font-size:14px;font-weight:500;padding:10px 0}.reading .notes-editor{font-size:15px}.reading .source{border-top:1px solid var(--line);margin-top:35px;padding-top:8px}.glossary-list{max-width:850px}.glossary-term{border-top:1px solid var(--line);padding:24px 0}.glossary-term h2{font-size:21px;margin-bottom:8px}.glossary-term p{margin-bottom:9px}.glossary-term a{font-size:13px;display:flex;align-items:center;gap:7px}.glossary-term a svg{width:15px}.side-footer{font-size:11px}.editor-block{border-radius:5px}.preview-tag{font-size:10px}.reading #personal-note .article{padding:10px 0;border:0}.auth-screen .brand{font-family:LearningSans}
@media(max-width:1250px){.content{padding:35px}.reading-layout{grid-template-columns:minmax(0,1fr) 170px;gap:30px}.search{width:210px}}
@media(max-width:1000px){.reading-layout{grid-template-columns:1fr}.page-toc{display:none}.content{padding:30px}.topbar{grid-template-columns:250px 1fr auto}.crumb{display:none}.tools{grid-column:3}.groups{grid-template-columns:1fr}.sidebar{width:250px}.shell{grid-template-columns:250px 1fr}}
@media(max-width:760px){.shell{display:block}.sidebar{top:65px;width:280px}.topbar{height:65px;grid-template-columns:32px 1fr auto;gap:9px;padding:0 14px}.header-brand{font-size:19px;gap:8px}.header-brand svg{width:24px;height:24px}.mobile-menu{display:grid;grid-column:1;grid-row:1}.header-brand{grid-column:2;grid-row:1}.tools{grid-column:3;grid-row:1}.topbar .search{width:34px;padding:7px;border:0;background:transparent}.topbar .search svg{display:block;cursor:pointer}.topbar .search input{position:absolute;width:0;opacity:0;pointer-events:none}.topbar .search:focus-within input{left:15px;right:60px;top:12px;width:calc(100% - 75px);height:40px;background:var(--bg);border:1px solid var(--line);padding:10px;opacity:1;pointer-events:auto;z-index:50}.topbar .search input:focus{outline:2px solid var(--accent)}.workspace{padding-top:65px}.content{padding:26px 21px 50px}h1{font-size:30px}h2{font-size:23px}.reading-section p{font-size:16px}.reading-heading{padding-bottom:20px}.reading-section{padding-top:25px;margin-bottom:10px}.reading .concept-diagram{padding:18px 8px}.concept-diagram .map-node{padding:8px;font-size:11px}.simulation{padding:18px 14px}.sim-body{grid-template-columns:1fr;gap:17px}.bit{font-size:20px;padding:9px}.map-node{font-size:12px}.page-turn{gap:15px}.overview-map{padding:18px 10px}.groups{gap:24px}.badge{font-size:11px}.search-label-button{display:block}}