/* vumio / notebook edition */
:root{--ink:#263c41;--green:#285c64;--muted:#68797c;--paper:#f4f3ed;--line:#dcded7;--surface:#fffefa;--field:#fffefa;--soft:#e9eeea;--accent-hover:#1e4d55;--danger:#a0433c;--error-bg:#fbede8;--shadow:none;color-scheme:light}
:root[data-theme=dark]{--ink:#e3e9e6;--green:#a3c9c8;--muted:#a0b2b1;--paper:#182326;--line:#354548;--surface:#202e31;--field:#1b282b;--soft:#2c3e41;--accent-hover:#c3ddda;--danger:#efa699;--error-bg:#492f2c;--shadow:none;color-scheme:dark}
body{font:15px/1.6 'Segoe UI',sans-serif;background:var(--paper);background-image:linear-gradient(var(--rule) 1px,transparent 1px);background-size:100% 32px;background-attachment:fixed}
.workspace{padding-left:224px}.sidebar{position:fixed;inset:0 auto 0 0;width:224px;padding:30px 20px;background:var(--surface);border-right:1px solid var(--line);z-index:20;display:flex;flex-direction:column}.brand{font-size:30px;gap:8px;letter-spacing:-1.4px;color:var(--ink);line-height:1.1}.brand small{display:block;font:11px/1.8 'Segoe UI',sans-serif;letter-spacing:.2px;color:var(--muted)}.brand-symbol{object-fit:contain;width:48px;height:48px}.sidebar-label{font-size:9px;letter-spacing:1.1px;color:var(--muted);margin:48px 10px 15px}.sidebar nav{display:grid;gap:5px}.nav-item{padding:12px 10px;text-decoration:none;color:var(--ink);font-size:13px;border-radius:5px;display:flex;gap:11px;align-items:center}.nav-item span{font-size:19px;line-height:1;width:18px;color:var(--muted)}.nav-item:hover,.nav-item.is-current{background:var(--soft);color:var(--green)}.nav-item.is-current{font-weight:650;box-shadow:inset 3px 0 var(--green)}.sidebar-note{margin-top:auto;padding:32px 12px 8px;font:italic 17px/1.6 Georgia,serif;color:var(--muted)}.notebook-lines{display:block;width:38px;height:29px;border-left:2px solid #c29164;background:repeating-linear-gradient(transparent 0 7px,var(--line) 7px 8px);margin-bottom:15px;transform:rotate(-6deg)}
.site-header{min-height:76px;padding:18px 40px;background:var(--surface);gap:16px;border-bottom:1px solid var(--line);flex-wrap:nowrap}.workspace-label{font-size:13px;font-weight:600}.workspace-label span{font-weight:400;color:var(--muted);margin-left:12px}.header-actions{display:flex;gap:14px;align-items:center;margin-left:auto}.header-actions form{margin:0}.theme-toggle{margin:0;border-color:transparent!important}.account-name{font-size:12px;max-width:160px;overflow-wrap:anywhere}.public-page .site-header{padding-left:6%;padding-right:6%}
main{max-width:1440px;padding:36px 40px 64px;min-height:calc(100vh - 140px)}footer{display:flex;gap:12px;padding:18px 40px;background:var(--paper)}footer strong{font-size:15px}h1{font-size:clamp(28px,3vw,38px);line-height:1.22;font-weight:650;letter-spacing:-1px;margin:10px 0 12px}h2{font-size:21px;letter-spacing:-.4px}h3{font-size:17px;font-weight:600;line-height:1.4}p{margin:10px 0 18px}.eyebrow{font-size:10px;letter-spacing:1.5px;color:var(--muted)}.page-heading{display:flex;align-items:center;justify-content:space-between;gap:24px;margin-bottom:24px}.page-heading p{margin-bottom:0;max-width:620px}.page-heading>.button,.page-heading>.quiet{flex-shrink:0}.button,.primary{background:#285c64;color:#fff;border-radius:5px;box-shadow:none;transition:background .15s;transform:none!important;padding:11px 17px;font-size:13px;font-weight:600}.button:hover,.primary:hover{background:#1e4c54}.quiet{border-radius:5px;padding:8px 13px;font-size:12px;box-shadow:none}.primary{width:auto;min-width:180px;gap:24px;justify-content:center}.danger{background:#a0433c}.danger:hover{background:#85372f}a{text-underline-offset:3px}.feature,.login-card{box-shadow:none;border-radius:8px;background:var(--surface)}.feature{padding:23px}.empty{border-radius:8px;padding:32px 22px;margin:18px 0;background:var(--surface);border:1px dashed var(--line)}.empty h3{font-size:17px}.empty p{font-size:13px;max-width:340px;margin:8px auto}.cards{grid-template-columns:repeat(2,minmax(0,1fr));margin:20px 0;gap:16px}.pill,.badge{font-size:11px;padding:4px 9px;border-radius:4px;background:var(--soft);color:var(--green)}.help{margin:16px 0 0;padding-top:12px}.notice,.error{border-radius:6px}.toolbar{gap:12px;margin:16px 0}.toolbar .button{flex:initial}
.dashboard-stats{display:flex;gap:0;border:1px solid var(--line);border-radius:7px;background:var(--surface);margin:28px 0}.dashboard-stats .feature{border:0;border-right:1px solid var(--line);border-radius:0;box-shadow:none;flex:1;padding:18px 24px;display:flex;gap:6px;flex-direction:column;font-size:12px;color:var(--muted)}.dashboard-stats .feature:last-child{border-right:0}.dashboard-stats strong{font-size:29px;line-height:1.1;font-weight:600;color:var(--ink)}.teacher-layout{display:grid;grid-template-columns:minmax(0,1fr) 290px;gap:28px;align-items:start}.teacher-layout>div{min-width:0}.review-panel{border:1px solid var(--line);background:var(--surface);padding:20px;border-radius:7px;border-top:3px solid #c69f61}.review-panel h2{font-size:18px;margin:0 0 12px}.review-panel .help{margin:0 0 20px;padding:0;border:0}.review-panel .empty{border:0;border-top:1px solid var(--line);padding:20px 0;margin-bottom:0;text-align:left;border-radius:0}.review-panel .empty p{margin-left:0}.review-panel .empty h3{font-size:14px}.search-toolbar{margin:0 0 24px;padding:16px;gap:10px;border-radius:7px;background:var(--surface)}.search-toolbar p{min-width:130px}.search-toolbar input:not([type=hidden]),.search-toolbar select{padding:9px;font-size:13px}.list-heading{margin:0}.course-cards .feature{border-top:3px solid var(--green)}.course-cards .toolbar{border-top:1px solid var(--line);padding-top:14px;margin-bottom:0;font-size:12px}.course-cards h2{font-size:20px}.course-cards p{font-size:13px}.course-cards .empty{grid-column:1/-1}.course-cards .help{min-height:0}
.back-link{font-size:12px;text-decoration:none;display:inline-block;margin-bottom:20px}.course-description{font-size:14px;max-width:760px;margin-top:12px;color:var(--muted)}.course-subject{margin-left:12px;color:var(--muted);font-size:12px}.course-tabs{display:flex;gap:24px;flex-wrap:wrap;border-bottom:1px solid var(--line);margin:28px 0 32px;padding:0 0 12px;background:var(--paper)}.course-tabs a{text-decoration:none;font-size:13px;font-weight:600}.section-title{display:flex;justify-content:space-between;align-items:center;gap:16px;margin:30px 0 18px}.section-title h2{margin:0}.section-title p{margin:4px 0 0;font-size:13px}.curriculum-section{padding:0;margin:14px 0}.curriculum-section .section-heading{gap:14px;padding:16px 20px;border-bottom:1px solid var(--line);background:var(--soft);border-radius:7px 7px 0 0}.curriculum-section .section-heading h3{margin:0;flex:1}.section-number{font:italic 21px Georgia,serif;color:var(--muted)}.lesson-list{list-style:none;padding:0;margin:0;counter-reset:lessons}.lesson-list li{counter-increment:lessons;display:flex;gap:15px;align-items:center;padding:15px 20px;border-bottom:1px solid var(--line)}.lesson-list li:last-child{border:0}.lesson-list li:before{content:counter(lessons,decimal-leading-zero);font-size:11px;color:var(--muted)}.lesson-list li>a{flex:1;text-decoration:none;font-size:14px}.action-menu{position:relative;font-size:12px;flex-shrink:0}.action-menu summary{cursor:pointer;color:var(--muted);padding:5px;list-style:none}.action-menu summary:after{content:' ⋯';font-size:16px}.action-menu[open]>div{position:absolute;right:0;top:100%;background:var(--surface);border:1px solid var(--line);padding:8px;min-width:175px;z-index:10;border-radius:6px;box-shadow:0 8px 20px #0001}.action-menu a{display:block;padding:8px;text-decoration:none}.action-menu a:hover{background:var(--soft)}.assignment-actions{border-top:1px solid var(--line);padding-top:14px;font-size:12px}.assignment-actions .toolbar{margin-bottom:0}.course-settings{margin-top:35px}.course-settings h2{margin:0}.course-settings p{font-size:13px}.course-students{margin-top:35px}.paper-empty{position:relative;text-align:left;border-style:solid;border-left:3px solid #c69f61}.paper-empty p{margin-left:0}.course-students .feature p{min-height:0}.course-tabs~section{scroll-margin-top:24px}
.editor{max-width:760px;margin:24px auto}.editor h1{margin-bottom:28px}.editor form>p{margin-bottom:22px}.editor label{display:block;font-size:13px;font-weight:600;margin-bottom:5px}.editor input:not([type=hidden]):not([type=checkbox]):not([type=radio]),.editor select,.editor textarea{border-radius:5px}.editor .primary{margin-top:26px}.builder-editor{max-width:960px}.builder-editor h1{font-size:32px}.builder-editor>p{font-size:13px;max-width:650px}.theory-layout{gap:20px}.lesson-meta{background:var(--surface);padding:16px;border:1px solid var(--line);border-radius:7px}.theory-compose textarea{border-radius:6px}.theory-preview{border-top:3px solid #c69f61}.question-card{border-radius:7px}.table-scroll{border:1px solid var(--line);border-radius:7px}table{border-radius:0}th{background:var(--soft)}.login-layout{gap:65px;padding-top:24px}.login-card{border-top:3px solid #c69f61}.intro h1{font:500 clamp(48px,5vw,68px)/1.12 Georgia,serif;letter-spacing:-2px}.intro em{font-style:italic;color:var(--green)}.book{background:var(--surface);border-left-color:var(--green);box-shadow:5px 7px 0 var(--line);font-family:Georgia,serif}.orbit{color:#bd944e}.note{box-shadow:1px 3px 0 var(--line);border-radius:0}.login-card .primary{width:100%;justify-content:space-between}.skip-link{position:fixed;top:-60px;left:240px;z-index:100;background:var(--surface);padding:12px}.skip-link:focus{top:10px}summary:focus-visible{outline:3px solid var(--green);outline-offset:3px}
@media(min-width:1450px){main{padding-left:56px;padding-right:56px}.teacher-layout{grid-template-columns:minmax(0,1fr) 310px}}
@media(max-width:1180px){.workspace{padding-left:200px}.sidebar{width:200px;padding:25px 14px}.site-header{padding:16px 26px}main{padding:28px 26px 50px}.teacher-layout{grid-template-columns:1fr}.review-panel{margin-top:8px}.review-panel .empty{padding:14px 0}.workspace-label span{display:none}}
@media(max-width:760px){.workspace{padding-left:0}.sidebar{position:static;width:auto;padding:16px 20px;border:0;border-bottom:1px solid var(--line)}.sidebar .brand-symbol{width:38px;height:38px}.sidebar .brand{font-size:25px}.sidebar .brand small,.sidebar-label,.sidebar-note{display:none}.sidebar nav{display:flex;gap:6px;overflow-x:auto;margin-top:16px}.nav-item{white-space:nowrap;padding:9px 11px;font-size:12px}.nav-item span{display:none}.nav-item.is-current{box-shadow:inset 0 -2px var(--green)}.site-header{padding:12px 20px;min-height:58px;flex-wrap:wrap}.workspace-label{display:none}.header-actions{gap:9px;width:100%;justify-content:space-between}.theme-toggle{font-size:11px}.account-name{font-size:11px}.page-heading{align-items:flex-start;gap:16px;flex-wrap:wrap}.page-heading>.button{margin-top:0}.page-heading h1{font-size:29px}.dashboard-stats .feature{padding:16px 13px;font-size:11px}.dashboard-stats strong{font-size:25px}.dashboard-stats{flex-wrap:wrap}.cards{grid-template-columns:1fr}main{padding:24px 20px 45px}.search-toolbar{padding:13px}.search-toolbar p{min-width:120px}.course-tabs{gap:16px}.section-title{align-items:flex-start;flex-wrap:wrap}.curriculum-section .section-heading{padding:14px}.lesson-list li{padding:14px}.action-menu summary{font-size:11px}.login-layout{padding:0;gap:28px}.public-page .site-header{padding:16px 20px}.public-page .header-actions{width:auto}.intro h1{font-size:46px}.login-card{padding:24px}.skip-link{left:20px}.course-subject{display:inline-block}.toolbar .button{flex:initial}.dashboard-columns{gap:24px}footer{padding:18px 20px}.theory-layout>*{min-width:0}}

/* Action hierarchy and quiet stationery details. */
.form-paper{background:var(--surface);border:1px solid var(--line);border-top:3px solid #c69f61;border-radius:8px;padding:32px;max-width:760px}.form-actions{display:flex;align-items:center;gap:12px;margin-top:28px}.form-actions .primary{margin:0}.course-settings{max-width:760px;margin:28px auto}.danger-settings{border-top:1px solid var(--line);margin-top:24px;padding-top:18px}.danger-settings summary{cursor:pointer;font-size:13px;color:var(--muted);font-weight:600}.danger-settings p{max-width:560px}.danger-outline{color:var(--danger);border-color:var(--danger)}.assignment-actions{display:flex;align-items:center;justify-content:space-between;gap:14px}.course-tabs{background:transparent}.brand-symbol{border-radius:5px}.brand{font-weight:750}.brand-symbol{background:var(--surface)}.page-heading{position:relative}.page-heading:after{content:'';position:absolute;right:0;bottom:-14px;width:70px;height:2px;background:#c69f61;opacity:.65}.course-tabs~section> .section-title{padding-top:8px}.button{position:relative;border-bottom:2px solid #173d43}.button:active{border-bottom-color:transparent}.sidebar-note{opacity:.8}.form-paper .helptext{font-weight:400}.curriculum-section .section-heading>.quiet{background:var(--surface)}.public-page main{max-width:1200px}.workspace main>section{margin-bottom:32px}.workspace .editor h1{font-size:30px}.course-tabs a:hover{text-decoration:underline}.review-panel .empty{background:transparent}
@media(max-width:760px){.form-paper{padding:22px 18px}.form-actions{flex-wrap:wrap}.assignment-actions{align-items:flex-start}.page-heading:after{display:none}.lesson-list li{flex-wrap:wrap}.lesson-list li>.action-menu{margin-left:auto}.lesson-list li>a{min-width:140px}}

:root{--rule:#285c6409}:root[data-theme=dark]{--rule:#cce2df08}.sidebar .brand-symbol{background:transparent}.course-students .roster{gap:12px}.course-students>form{margin:16px 0}.action-menu summary:hover{color:var(--green)}.library-actions{display:flex;gap:12px;align-items:center;justify-content:space-between;margin-top:20px;padding-top:16px;border-top:1px solid var(--line)}.library-actions>a{font-size:13px}.workspace .section-heading h2{margin:0}.form-paper input[type=checkbox]{display:inline-block!important;width:auto!important}.login-card label{color:var(--ink)}

/* Reference-led identity: quiet azure and sea glass. */
:root{--green:#306b83;--paper:#f3f6f5;--soft:#e8f0ef;--rule:#306b8308}:root[data-theme=dark]{--green:#9acbcf;--paper:#182428;--soft:#2b4045;--rule:#cce2df07}.button,.primary{background:#306b83;border-bottom-color:#245164}.button:hover,.primary:hover{background:#25596f}.danger{background:#a0433c}.danger:hover{background:#85372f}.brand-symbol{width:43px;height:43px}.brand{gap:11px}.brand small{font-size:10px;letter-spacing:.35px}.sidebar .brand-symbol{background:transparent}