/* Academia Summer palette. All three layouts share the same subject colours. */
:root{font-family:"Segoe UI",Inter,system-ui,sans-serif;color:#172033;font-synthesis:none;--brand:#312e81;--accent:#db2777;--strong:#be185d;--tint:#fdf2f8;--line:#e2e8f0;--muted:#64748b;--paper:#fff;--canvas:#f8fafc;--sidebar:244px;--radius:20px}
*{box-sizing:border-box}body{margin:0;background:var(--canvas);font-size:15px}button,input,textarea{font:inherit}button{color:inherit;cursor:pointer}a{color:inherit;text-decoration:none}svg{width:21px;height:21px;flex-shrink:0}button:disabled{opacity:.38;cursor:default}button:focus-visible,a:focus-visible,input:focus-visible,textarea:focus-visible,summary:focus-visible{outline:3px solid #818cf8;outline-offset:4px}h1,h2,h3,h4,p{margin-top:0}h1{font-size:35px;line-height:1.17;letter-spacing:-1.25px;font-weight:750;margin-bottom:12px}h2{font-size:21px;letter-spacing:-.65px}h3{font-size:22px;line-height:1.3;letter-spacing:-.5px}h4{font-size:16px;line-height:1.5}p{line-height:1.8}ul,ol{padding-left:22px;line-height:1.8}li+li{margin-top:8px}.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}.skip{position:fixed;top:-60px;left:20px;z-index:30;background:white;padding:14px}.skip:focus{top:10px}
.comparison{height:56px;display:flex;align-items:center;gap:28px;padding:0 24px;background:#fff;border-bottom:1px solid #e2e8f0;color:#475569}.comparison-label{font-size:12px}.versions{display:flex;gap:4px;background:#f1f5f9;padding:4px;border-radius:12px}.versions button{border:0;background:none;font-size:12px;font-weight:650;padding:7px 16px;color:#64748b;border-radius:9px}.versions button span{font-size:10px;margin-right:7px;opacity:.6}.versions button[aria-pressed=true]{background:#fff;color:#312e81;box-shadow:0 2px 5px #17203312}.comparison-note{margin-left:auto;font-size:11px;color:#94a3b8}
.app-shell{display:grid;grid-template-columns:var(--sidebar) minmax(0,1fr);min-height:calc(100vh - 56px)}.sidebar{position:sticky;top:0;height:100vh;display:flex;flex-direction:column;padding:30px 18px 24px;background:#fff;border-right:1px solid var(--line)}.brand{display:flex;align-items:center;gap:12px;padding:0 10px 44px}.brand-symbol{display:grid;place-items:center;position:relative;background:var(--brand);width:42px;height:42px;border-radius:13px;color:#fff;font-size:24px;font-weight:750;box-shadow:0 5px 14px #312e8120}.brand-symbol>span{position:absolute;right:7px;bottom:4px;font-size:25px;color:#c7d2fe}.brand strong{font-size:21px;font-weight:750;letter-spacing:-.8px}.brand strong>span{display:block;font-size:11px;color:var(--muted);letter-spacing:0;font-weight:500;margin-top:4px}.sidebar-label{font-size:12px;font-weight:550;color:#94a3b8;padding:0 14px 14px}.subjects{display:flex;flex-direction:column;gap:8px}.subjects>a{display:flex;align-items:center;gap:12px;min-height:54px;padding:10px 12px;border-radius:13px;font-size:14px;font-weight:550;color:#475569;transition:background .15s,transform .15s}.subjects>a:hover{background:#f8fafc}.subjects>a[aria-current]{background:var(--subject-soft);color:var(--subject);font-weight:700}.subject-mark{width:31px;height:31px;border-radius:10px;display:grid;place-items:center;color:var(--subject);background:var(--subject-soft)}.subject-mark svg{width:19px;height:19px}.subjects>a[aria-current] .subject-mark{background:#fff;box-shadow:0 2px 5px #17203308}.subject-count{margin-left:auto;font-size:11px;color:#94a3b8}.sidebar-bottom{margin-top:auto;border-top:1px solid var(--line);padding:22px 12px 0;display:flex;flex-direction:column;gap:7px}.school-year{font-size:12px;color:#64748b}.edition{font-size:11px;color:#94a3b8}.main-shell{min-width:0;background:radial-gradient(ellipse at 90% 0%,color-mix(in srgb,var(--accent) 5%,transparent),transparent 40%),var(--canvas)}.context-bar{height:62px;display:flex;align-items:center;justify-content:space-between;padding:0 40px;border-bottom:1px solid var(--line);background:#ffffffa8}.breadcrumbs{display:flex;align-items:center;flex-wrap:wrap;gap:10px;color:#94a3b8;font-size:12px}.breadcrumbs a{color:#475569}.breadcrumbs a:hover{color:var(--accent)}.context-edition{font-size:11px;color:#94a3b8}.context-bar .breadcrumbs>span:last-child{color:#475569}main{padding:30px 40px 50px;max-width:1320px;margin:auto;outline:none}.page-heading{display:flex;align-items:center;justify-content:space-between;gap:24px;margin-bottom:35px}.page-heading p{font-size:14px;color:var(--muted);margin:0}.subject-label{display:inline-flex;align-items:center;gap:8px;font-size:12px;font-weight:650;color:var(--accent);margin-bottom:14px}.subject-label svg{width:17px;height:17px}.section-heading{display:flex;align-items:center;justify-content:space-between;gap:20px;margin-bottom:18px}.section-heading h2{display:flex;align-items:center;gap:10px;margin:0;font-size:18px}.count-badge{display:grid;place-items:center;width:23px;height:23px;border-radius:7px;background:#e2e8f0;color:#64748b;font-size:11px;font-weight:600}.search{display:flex;align-items:center;gap:9px;background:white;border:1px solid var(--line);border-radius:11px;padding:0 13px;color:#94a3b8}.search svg{width:17px;height:17px}.search input{border:0;padding:11px 0;background:none;outline:none;width:175px;font-size:13px;color:#475569}.lesson-row{display:flex;align-items:center;gap:20px;padding:23px 26px;background:white;border:1px solid var(--line);border-radius:16px;transition:box-shadow .18s,transform .18s,border-color .18s}.lesson-row:hover{transform:translateY(-2px);border-color:color-mix(in srgb,var(--accent) 40%,white);box-shadow:0 10px 30px #17203308}.lesson-number{width:43px;height:43px;display:grid;place-items:center;background:var(--tint);color:var(--accent);border-radius:13px;font-size:14px;font-weight:700;flex-shrink:0}.lesson-description{flex:1}.chapter{display:block;font-size:12px;color:var(--muted);margin-bottom:7px}.lesson-description h3{font-size:17px;line-height:1.4;margin:0;letter-spacing:-.4px}.lesson-meta{font-size:12px;color:#94a3b8;white-space:nowrap}.open-lesson{display:flex;gap:9px;align-items:center;border-radius:9px;background:var(--tint);color:var(--accent);padding:10px 13px;font-size:12px;font-weight:650;margin-left:8px}.open-lesson svg{width:16px;height:16px}.empty{padding:30px;color:var(--muted);background:white;border:1px dashed var(--line);border-radius:12px}
.back-link{display:inline-flex;align-items:center;gap:7px;font-size:12px;color:var(--muted);margin-bottom:21px}.back-link svg{width:15px;height:15px}.back-link:hover{color:var(--accent)}.eyebrow{font-size:12px;color:var(--muted);font-weight:500;line-height:1.6;display:block;margin-bottom:9px}.course-heading{margin-bottom:24px}.course-heading h1{font-size:30px;margin:0;line-height:1.25;max-width:800px}.course-badge{display:none}.steps{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:11px;margin-bottom:24px}.step{display:flex;align-items:center;gap:11px;padding:16px 14px;background:#fff;border:1px solid var(--line);border-radius:14px;min-height:86px;transition:box-shadow .15s,border-color .15s;min-width:0}.step:hover{border-color:var(--accent);box-shadow:0 4px 14px #17203308}.step-icon{width:33px;height:33px;display:grid;place-items:center;border-radius:10px;background:#f1f5f9;color:#64748b;flex-shrink:0}.step-icon svg{width:18px;height:18px}.step-copy{min-width:0;display:flex;flex-direction:column;gap:5px}.step-number{font-size:9px;letter-spacing:.5px;color:#94a3b8;font-weight:650}.step strong{font-size:13px;font-weight:650;line-height:1.35;letter-spacing:-.2px}.step small{font-size:10px;color:#94a3b8}.step[aria-current]{background:linear-gradient(115deg,var(--accent),var(--strong));border-color:transparent;box-shadow:0 6px 16px color-mix(in srgb,var(--accent) 17%,transparent);color:#fff}.step[aria-current] .step-icon{background:#ffffff20;color:#fff}.step[aria-current] .step-number,.step[aria-current] small{color:#ffffffe0}.step-chevron{display:none}.activity{border:1px solid var(--line);border-radius:var(--radius);background:#fff;box-shadow:0 5px 24px #17203304;overflow:hidden}.activity-heading{display:flex;align-items:center;gap:12px;padding:21px 28px;border-bottom:1px solid #f1f5f9}.activity-heading h2{font-size:19px;margin:0}.activity-heading .eyebrow{font-size:10px;color:#94a3b8;margin:0 0 3px}.activity-symbol{width:39px;height:39px;border-radius:12px;display:grid;place-items:center;background:var(--tint);color:var(--accent)}.text-button{margin-left:auto;border:1px solid var(--line);border-radius:8px;background:white;font-size:11px;color:var(--muted);padding:7px 11px}#activity-content{padding:25px 30px 28px;font-size:16px;line-height:1.8}.activity-tools{display:flex;align-items:flex-start;gap:10px;flex-wrap:wrap;margin-bottom:22px}.activity-tools>.reveal{flex:1;min-width:200px;margin:0}.content-block{margin-bottom:26px}.content-block:last-child{margin-bottom:0}.content-block h3{margin-bottom:16px}.content-block p:last-child{margin:0}.reveal{border:1px solid var(--line);border-radius:11px;margin:14px 0;font-size:14px;overflow:hidden;background:#fff}.reveal summary{padding:11px 14px;color:#475569;line-height:1.6;cursor:pointer;list-style-position:inside;font-size:13px;font-weight:550}.reveal[open]>summary{background:#f8fafc;border-bottom:1px solid var(--line);color:var(--accent)}.revealed{padding:20px;color:#334155}.revealed h4{margin:15px 0 7px}.revealed h4:first-child{margin-top:0}.revealed p:last-child{margin:0}.revealed>.content-block{margin-bottom:24px}.objectives{padding:18px;background:var(--tint);border-radius:11px}.objectives h3{font-size:17px;color:var(--strong)}.objectives ul{margin:0;font-size:14px}.notion-index{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:8px;margin-bottom:26px}.notion-index button{display:flex;align-items:flex-start;gap:7px;text-align:left;padding:11px 9px;border:1px solid transparent;border-radius:10px;background:#f8fafc;color:#64748b;font-size:11px;line-height:1.5}.notion-index button>span{font-size:10px;min-width:16px;font-weight:700}.notion-index button[aria-current]{border-color:color-mix(in srgb,var(--accent) 25%,white);background:var(--tint);color:var(--strong)}.notion-index button:hover{color:var(--accent)}.reading-meta{display:flex;align-items:center;justify-content:space-between;font-size:11px;color:#94a3b8;margin-bottom:13px}.reading-meta>span:first-child{color:var(--accent);font-weight:650}.notion h3{font-size:25px;line-height:1.3;letter-spacing:-.7px;margin-bottom:20px}.notion p{color:#334155}.practice{margin-top:25px;border:1px solid color-mix(in srgb,var(--accent) 15%,white);padding:20px;border-radius:13px;background:var(--tint)}.practice h4{font-size:13px;color:var(--strong);margin-bottom:10px}.practice p{font-size:15px}.practice .reveal{margin-bottom:0;border-color:transparent;background:#fff}.practice .reveal summary{color:var(--strong)}.example+.example{border-top:1px solid var(--line);margin-top:24px;padding-top:24px}.example h4{font-size:18px}.concept{padding:17px;background:#f8fafc;border-radius:10px;font-size:13px;color:var(--muted);margin:20px 0}.item-navigation{display:flex;align-items:center;justify-content:space-between;gap:14px;border-top:1px solid #f1f5f9;padding-top:20px;margin:25px 0}.primary,.secondary{display:inline-flex;align-items:center;justify-content:center;gap:10px;padding:11px 16px;border-radius:10px;font-size:12px;font-weight:650;border:1px solid transparent;line-height:1.5;min-height:42px}.primary{background:var(--accent);color:white;box-shadow:0 4px 10px color-mix(in srgb,var(--accent) 12%,transparent)}.primary:hover{background:var(--strong)}.secondary{background:white;color:#64748b;border-color:var(--line)}.secondary:hover{border-color:var(--accent);color:var(--accent)}.step-footer{display:flex;justify-content:space-between;gap:14px;margin-top:18px}.step-footer a{font-size:12px}.summary-list{list-style:none;margin:0;padding:0}.summary-list li{display:flex;gap:17px;padding:19px 0;border-bottom:1px solid #f1f5f9;margin:0;align-items:baseline}.summary-list li:last-child{border:0}.summary-list li>span{font-size:11px;font-weight:700;color:var(--accent);width:26px;flex-shrink:0}.summary-list li>div{font-size:16px}.table-wrap{overflow-x:auto;margin:18px 0;border:1px solid var(--line);border-radius:10px}table{width:100%;border-collapse:collapse;font-size:13px;line-height:1.7}td,th{padding:12px 15px;border-bottom:1px solid var(--line);text-align:left;vertical-align:top;min-width:90px}th{background:#f8fafc}tr:last-child td{border-bottom:0}.equation{font-family:Consolas,monospace;background:#f8fafc;border-radius:10px;padding:16px}
.flash-stage{max-width:720px;margin:0 auto}.flash-top{display:flex;align-items:center;justify-content:space-between;margin-bottom:20px}.flash-top h3{font-size:16px;margin:0}.flash-top h3 span{color:#94a3b8;font-weight:400}.flash-top>span{font-size:12px;border-radius:6px;background:var(--tint);color:var(--accent);padding:4px 9px}.flash-card{position:relative;display:flex;flex-direction:column;align-items:center;justify-content:space-between;gap:35px;width:100%;min-height:310px;padding:30px 42px;border:0;border-radius:20px;background:linear-gradient(135deg,var(--accent),var(--strong));color:white;box-shadow:0 10px 25px color-mix(in srgb,var(--accent) 15%,transparent);transition:transform .18s}.flash-card:hover{transform:translateY(-2px)}.flash-card>span:first-child{font-size:10px;letter-spacing:1.8px;color:#ffffffbf;font-weight:700}.flash-card strong{font-size:24px;line-height:1.6;font-weight:600;letter-spacing:-.5px}.flash-card .flip-label{background:#ffffff20;border:1px solid #ffffff20;border-radius:8px;padding:8px 12px;font-size:12px}.flash-card.flipped{background:#fff;color:#172033;border:1px solid var(--accent);box-shadow:0 10px 25px #17203308}.flash-card.flipped>span:first-child{color:var(--accent)}.flash-card.flipped .flip-label{background:var(--tint);color:var(--strong)}.flash-controls{display:flex;justify-content:space-between;margin-top:22px}.card-indexes,.question-index{display:flex;align-items:center;gap:8px;flex-wrap:wrap}.card-indexes{justify-content:center;margin-top:25px}.card-indexes button,.question-index button{border:1px solid var(--line);background:#fff;color:#94a3b8;border-radius:9px;width:34px;height:34px;font-size:12px;font-weight:600}.card-indexes button[aria-current],.question-index button[aria-current]{background:var(--accent);border-color:var(--accent);color:#fff}.exercise-toolbar{display:flex;align-items:center;justify-content:space-between;gap:15px;flex-wrap:wrap;margin-bottom:23px}.mode-switch{display:flex;gap:4px;border-radius:10px;background:#f1f5f9;padding:4px}.mode-switch button{border:0;background:none;border-radius:7px;padding:8px 14px;font-size:12px;font-weight:600;color:#64748b}.mode-switch button[aria-pressed=true]{background:#fff;color:var(--accent);box-shadow:0 2px 5px #17203310}.exercise-toolbar>span{font-size:12px;color:#94a3b8}.mode-description{margin:18px 0 24px;font-size:13px;color:#64748b}.exercise-heading{display:flex;align-items:center;justify-content:space-between;gap:15px;margin-bottom:17px}.exercise-heading h3{margin:0;font-size:22px}.exercise-heading>span{font-size:11px;color:var(--strong);background:var(--tint);padding:4px 9px;border-radius:7px}.exercise label{font-size:12px;font-weight:600;color:#64748b;display:block;margin:22px 0 9px}.exercise textarea{width:100%;display:block;resize:vertical;border:1px solid var(--line);border-radius:13px;background:#f8fafc;padding:17px 19px;font-size:16px;color:#172033;line-height:1.6;min-height:130px;transition:border-color .15s,background .15s}.exercise textarea:focus{background:#fff;border-color:var(--accent)}.exercise textarea::placeholder{color:#94a3b8}.feedback{background:#f8fafc;border-radius:10px;padding:16px;margin-top:18px}.feedback>strong{font-size:12px;color:#64748b}.local-note{font-size:11px;color:#94a3b8;margin:22px 0 0}.finish-control{margin:5px 0 0}
.app-mode .app-shell{min-height:100vh}.app-mode[data-version=matiere] .sidebar{height:calc(100vh - 32px)}
/* Focus: Summer indigo sidebar, slim steps, focused white activity canvas. */
body[data-version=tableau]{--sidebar:224px}.tableau-placeholder{display:none}body[data-version=tableau] .sidebar{background:#312e81;border-color:#3730a3}body[data-version=tableau] .brand{color:#fff}body[data-version=tableau] .brand-symbol{background:#ffffff15;border:1px solid #ffffff20;box-shadow:none}body[data-version=tableau] .brand strong>span,body[data-version=tableau] .sidebar-label,body[data-version=tableau] .school-year,body[data-version=tableau] .edition{color:#a5b4fc}body[data-version=tableau] .subjects>a{color:#e0e7ff}body[data-version=tableau] .subjects>a:hover{background:#ffffff0b}body[data-version=tableau] .subjects>a[aria-current]{background:#fff;color:var(--subject);box-shadow:0 5px 14px #1e1b4b15}body[data-version=tableau] .subject-mark{background:#ffffff14;color:#e0e7ff}body[data-version=tableau] .subjects>a[aria-current] .subject-mark{background:var(--subject-soft);color:var(--subject)}body[data-version=tableau] .subject-count{color:#a5b4fc}body[data-version=tableau] .sidebar-bottom{border-color:#ffffff15}body[data-version=tableau] .main-shell{background:#f8fafc}body[data-version=tableau] .context-bar{background:#fff}body[data-version=tableau] .steps{gap:0;background:#e2e8f0;border:1px solid #e2e8f0;padding:4px;border-radius:14px}body[data-version=tableau] .step{border:0;border-radius:10px;background:transparent;min-height:60px;box-shadow:none;padding:10px 12px}body[data-version=tableau] .step-icon{background:transparent;width:24px}body[data-version=tableau] .step-number,body[data-version=tableau] .step small{display:none}body[data-version=tableau] .step[aria-current]{background:white;color:var(--accent);box-shadow:0 2px 6px #1720330b}body[data-version=tableau] .step[aria-current] .step-icon{background:transparent;color:var(--accent)}body[data-version=tableau] .activity{border-radius:22px;box-shadow:0 12px 35px #17203306}body[data-version=tableau] .activity-heading{padding:22px 30px}body[data-version=tableau] .lesson-row{border-radius:13px}
/* Compact: floating subject panel and vertical steps; same Summer palette. */
body[data-version=matiere]{--sidebar:238px}body[data-version=matiere] .sidebar{height:calc(100vh - 88px);top:16px;margin:16px 0 16px 16px;border:1px solid var(--line);border-radius:20px;padding:25px 12px 20px;box-shadow:0 5px 20px #17203303}body[data-version=matiere] .main-shell{background:#f8fafc}body[data-version=matiere] .context-bar{border:0;background:none;height:62px}body[data-version=matiere] .lesson-workspace{display:grid;grid-template-columns:150px minmax(0,1fr);gap:22px;align-items:start}body[data-version=matiere] .steps{display:flex;flex-direction:column;gap:8px;position:sticky;top:20px;margin:0}body[data-version=matiere] .step{padding:13px 10px;border:0;border-radius:12px;background:none;gap:9px;min-height:76px;box-shadow:none}body[data-version=matiere] .step small{display:none}body[data-version=matiere] .step strong{font-size:12px}body[data-version=matiere] .step-icon{width:29px;height:29px;background:white;border:1px solid var(--line);border-radius:9px}body[data-version=matiere] .step[aria-current]{background:var(--tint);color:var(--strong)}body[data-version=matiere] .step[aria-current] .step-icon{background:var(--accent);border-color:transparent;color:white}body[data-version=matiere] .step[aria-current] .step-number{color:var(--accent)}body[data-version=matiere] #activity-content{padding:23px 26px}body[data-version=matiere] .activity-heading{padding:20px 26px}body[data-version=matiere] .notion-index{grid-template-columns:repeat(2,minmax(0,1fr))}body[data-version=matiere] .course-heading h1{font-size:29px}
@media(max-width:1100px){:root{--sidebar:215px}body[data-version=tableau]{--sidebar:205px}body[data-version=matiere]{--sidebar:215px}main{padding:26px}.context-bar{padding:0 26px}.comparison-note,.context-edition{display:none}.subjects>a{font-size:13px;gap:9px;padding:10px}.brand{gap:10px;padding-left:7px}.brand strong{font-size:19px}.step{padding:14px 11px;gap:8px}.step-icon{width:25px}.step strong{font-size:12px}.step small{display:none}.step-number{font-size:9px}.lesson-meta{display:none}.course-heading h1{font-size:28px}.notion-index{grid-template-columns:repeat(2,minmax(0,1fr))}body[data-version=matiere] .lesson-workspace{grid-template-columns:125px minmax(0,1fr);gap:14px}body[data-version=matiere] .step{gap:8px;padding:12px 7px}body[data-version=matiere] .step-icon{display:none}.lesson-row{padding:22px 20px}.open-lesson{padding:9px}.lesson-description h3{font-size:16px}}
@media(max-width:760px){.comparison{height:54px;padding:0 14px;gap:13px}.comparison-label{font-size:10px}.versions{padding:3px;gap:1px}.versions button{font-size:11px;padding:7px 10px}.versions button span{font-size:9px;margin-right:4px}.app-shell{display:block}.sidebar,body[data-version=tableau] .sidebar,body[data-version=matiere] .sidebar{position:relative;top:0;height:auto;border:0;border-radius:0;margin:0;padding:18px 16px 14px;display:block;box-shadow:none;border-bottom:1px solid var(--line)}.brand{padding:0 0 16px;gap:10px}.brand-symbol{width:32px;height:32px;font-size:20px;border-radius:10px}.brand-symbol>span{font-size:21px;right:5px;bottom:3px}.brand strong{font-size:19px}.brand strong>span{display:inline;margin-left:13px;font-size:11px}.sidebar-label,.sidebar-bottom{display:none}.subjects{flex-direction:row;flex-wrap:wrap;gap:6px}.subjects>a{min-height:36px;font-size:12px;padding:7px 9px;gap:6px;border:1px solid var(--line);border-radius:9px}.subject-mark{width:18px;height:18px;border-radius:0;background:none!important;box-shadow:none!important}.subject-mark svg{width:17px;height:17px}.subject-count{display:none}body[data-version=tableau] .subjects>a{border-color:#ffffff20}body[data-version=tableau] .subjects>a[aria-current]{border-color:transparent}.context-bar,body[data-version=matiere] .context-bar{height:auto;min-height:48px;padding:13px 20px}.breadcrumbs{gap:7px;font-size:10px;line-height:1.7}main{padding:23px 18px 35px}.page-heading{margin-bottom:25px}h1{font-size:31px}.page-heading p{font-size:13px}.section-heading{align-items:flex-start;flex-direction:column;gap:14px}.search{width:100%}.search input{width:100%;min-width:0;font-size:13px}.lesson-row{padding:20px 15px;gap:13px;align-items:flex-start}.lesson-number{width:33px;height:36px;font-size:12px;border-radius:10px}.chapter{font-size:11px;line-height:1.6}.lesson-description h3{font-size:16px;line-height:1.5}.open-lesson{font-size:0;padding:7px;margin:0;align-self:center;background:none}.open-lesson svg{width:18px}.back-link{font-size:11px;margin-bottom:17px}.course-heading h1,body[data-version=matiere] .course-heading h1{font-size:26px;line-height:1.25;letter-spacing:-.8px}.course-heading .eyebrow{font-size:11px}.steps{grid-template-columns:repeat(2,minmax(0,1fr));gap:8px;margin-bottom:20px}.step{min-height:65px;padding:12px;gap:9px;border-radius:12px}.step-icon{width:25px;height:28px;border-radius:8px}.step-icon svg{width:17px}.step strong{font-size:12px}.step-number{font-size:8px}.activity{border-radius:16px}.activity-heading,body[data-version=tableau] .activity-heading,body[data-version=matiere] .activity-heading{padding:18px}.activity-heading h2{font-size:18px}.activity-symbol{width:34px;height:34px;border-radius:10px}.text-button{font-size:10px;padding:6px 9px}#activity-content,body[data-version=matiere] #activity-content{padding:20px 18px;font-size:16px}.activity-tools{margin-bottom:18px}.activity-tools>.reveal{min-width:100%}.reveal summary{font-size:12px;padding:11px 12px}.revealed{padding:16px}.notion-index{gap:6px;margin-bottom:24px}.notion-index button{font-size:10px;padding:10px 8px;gap:5px}.notion h3{font-size:23px}.notion p{font-size:16px}.practice{padding:16px}.primary,.secondary{font-size:11px;padding:10px 12px;max-width:100%}.item-navigation{gap:8px}.step-footer .primary,.step-footer .secondary{font-size:11px;padding:10px 12px}.summary-list li{gap:10px;padding:16px 0}.summary-list li>span{width:21px}.summary-list li>div{font-size:15px}.flash-card{min-height:280px;padding:25px 20px;border-radius:15px}.flash-card strong{font-size:22px}.flash-controls{gap:10px}.card-indexes{gap:6px}.card-indexes button,.question-index button{width:29px;height:31px;border-radius:7px;font-size:11px}.question-index{gap:5px}.exercise-toolbar{gap:12px;margin-bottom:20px}.exercise-toolbar>span{font-size:11px}.mode-switch button{font-size:11px;padding:8px 11px}.exercise-heading h3{font-size:20px}.exercise-heading>span{font-size:10px}.exercise textarea{padding:14px;font-size:16px}.mode-description{font-size:12px}.local-note{font-size:10px}body[data-version=tableau] .step{min-height:57px;padding:10px 8px;gap:6px}body[data-version=tableau] .step strong{font-size:11px}body[data-version=tableau] .step-icon{width:20px}body[data-version=tableau] .activity{border-radius:16px}body[data-version=matiere] .lesson-workspace{display:block}body[data-version=matiere] .steps{position:static;display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:6px;margin-bottom:20px}body[data-version=matiere] .step{min-height:62px;padding:11px 10px}body[data-version=matiere] .step-icon{display:grid;width:26px;height:26px}body[data-version=matiere] .step strong{font-size:12px}}
@media(prefers-reduced-motion:reduce){*{transition:none!important;scroll-behavior:auto!important}}
.learning-figure{margin:26px 0 32px;border:1px solid var(--line);border-radius:14px;padding:18px;background:#fff}.figure-title{font-size:16px;font-weight:650;line-height:1.5;margin-bottom:14px}.diagram-scroll{overflow-x:auto;border-radius:12px;scrollbar-width:thin}.diagram-scroll>svg{display:block;width:100%;min-width:480px;height:auto;max-width:760px;margin:auto}.learning-figure figcaption{font-size:13px;color:#475569;line-height:1.8;margin-top:14px}.learning-figure>.reveal{margin-bottom:0}.method-list{padding-left:25px}.method-list li{padding-left:5px;margin-bottom:14px}.example-prompt{font-size:19px;font-weight:650;color:var(--strong)}.worked-step{border-left:3px solid var(--accent);padding:3px 0 1px 20px;margin:23px 0}.worked-step h4{font-size:16px;margin-bottom:12px}.worked-step>.equation{font-size:18px;padding:14px 18px;line-height:1.8}.worked-step>.equation p{margin:0}.worked-step>p{font-size:14px;color:#475569;margin:12px 0 0}.pitfall{border-top:1px solid var(--line);padding:20px 0}.pitfall:first-child{border-top:0;padding-top:0}.pitfall h4{font-size:18px;margin-bottom:13px}.pitfall p{font-size:15px;margin-bottom:10px}.pitfall-context{padding:12px 15px;background:#f8fafc;border-radius:8px;font-weight:600}.pitfall-correction{padding:14px 16px;background:var(--tint);border-radius:10px}.synthesis-recall{padding-top:20px;border-top:1px solid var(--line)}
@media(max-width:760px){.learning-figure{padding:12px;margin:22px 0 26px}.figure-title{font-size:15px}.learning-figure figcaption{font-size:13px}.worked-step{padding-left:13px}.worked-step>.equation{font-size:16px;padding:12px}.pitfall h4{font-size:17px}}
@media(max-width:760px){.app-mode[data-version=matiere] .sidebar{height:auto}}
@media print{.comparison,.sidebar,.context-bar,.steps,.step-footer,.back-link,.text-button,.card-indexes,.flash-controls,.mode-switch,.notion-index,.item-navigation{display:none!important}.app-shell,.lesson-workspace{display:block!important}body{background:#fff;color:#000}main{padding:0!important}.activity{border:0;box-shadow:none}#activity-content{padding:15px 0!important}}
@media(min-width:761px) and (max-width:1100px){body[data-version=matiere] .lesson-workspace{display:block}body[data-version=matiere] .steps{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));position:static;margin-bottom:20px;gap:6px}body[data-version=matiere] .step{min-height:64px;padding:11px 8px}body[data-version=matiere] .step strong{font-size:11px}}

.math-notation{font-family:"Cambria Math","STIX Two Math","Latin Modern Math",serif;font-size:1.12em;line-height:normal}.equation{font-family:"Cambria Math","STIX Two Math",serif;font-variant-numeric:lining-nums}.math-notation mi{font-style:italic}.math-notation mn,.math-notation mo{font-style:normal}

.check-label{display:block;font-size:12px;font-weight:600;color:#64748b;margin:18px 0 8px}.check-answer{display:block;width:100%;resize:vertical;border:1px solid var(--line);border-radius:10px;background:white;color:#172033;padding:13px 15px;font:inherit;font-size:15px;line-height:1.6}.response-format{font-size:13px;color:#64748b;background:#f8fafc;padding:12px 15px;border-radius:9px}

/* Observation documents share the figure layout and remain available offline. */
.diagram-scroll>.course-observation-image { display:block; width:100%; max-width:100%; min-width:0; height:auto; }

.audio-support,.oral-practice{border:1px solid var(--line);border-radius:14px;padding:20px;margin:0 0 24px;background:#fff;min-width:0}.audio-support h3,.oral-practice h3{font-size:19px;line-height:1.4;margin:0 0 10px}.media-origin{font-size:13px;color:#64748b}.audio-support audio{display:block;width:100%;max-width:100%;margin:16px 0}.oral-clock{margin:16px 0}.oral-clock output{display:block;font-size:32px;font-variant-numeric:tabular-nums;line-height:1.4;margin:0 0 12px}.clock-controls{display:flex;gap:8px;flex-wrap:wrap}.clock-controls button:disabled{opacity:.5}.oral-practice .reveal{margin-top:16px}@media print{.audio-support audio,.clock-controls{display:none}}

/* Long readings use the same activity surface and remain keyboard accessible. */
.reading-support{margin:20px 0;padding:22px;border:1px solid var(--line,#e2e8f0);border-radius:16px;background:#fff;min-width:0}.reading-support h3{margin:8px 0}.reading-support select{width:100%;max-width:100%;padding:12px;border:1px solid #cbd5e1;border-radius:10px;background:#fff;color:inherit;font:inherit}.reading-navigation{display:flex;align-items:center;justify-content:space-between;gap:10px;margin:14px 0;flex-wrap:wrap}.book-text{line-height:1.85;font-size:1.05rem}.book-text p{margin:0 0 1.1em}.chapter-subtitle{font-weight:650}.reading-table{overflow-x:auto;margin:20px 0}.reading-table table{width:100%;border-collapse:collapse}.reading-table td{padding:8px 10px;border:1px solid #cbd5e1;vertical-align:top}.reading-note{font-size:.9em;border-top:1px solid #cbd5e1;padding-top:12px}@media(max-width:600px){.reading-support{padding:16px}.reading-navigation button{font-size:12px}.reading-navigation{gap:8px}}
.access-link{display:block;padding:10px 0;margin-bottom:12px;font-size:14px;color:#334155}.access-quick{margin:0 0 24px;padding:14px 18px;border:1px solid var(--line);background:white;border-radius:12px}.access-quick>p{font-size:14px;line-height:1.6;margin:0 0 8px;color:#334155}.access-actions{display:flex;flex-wrap:wrap;gap:10px;align-items:center}.access-actions>a{font-size:14px;padding:10px 2px}.access-adjust{max-width:100%;min-width:0}.access-adjust>summary{cursor:pointer;min-height:44px;padding:10px 12px;border:1px solid var(--line);border-radius:10px;font-size:14px}.access-adjust[open]{flex:1 1 100%}.access-adjust form{padding:18px 0 8px}.access-adjust form>p,.access-storage{font-size:14px;line-height:1.7;color:#475569}.access-settings{padding:28px;background:white;border:1px solid var(--line);border-radius:16px;max-width:900px;min-width:0}.access-settings h2{font-size:22px}.access-settings>p{line-height:1.8}.access-fields{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:18px;margin:18px 0}.access-fields label{display:flex;flex-direction:column;gap:8px;min-width:0;font-size:15px;font-weight:600}.access-fields select{width:100%;min-width:0;min-height:44px;padding:10px 12px;border:1px solid #94a3b8;border-radius:8px;background:#fff;color:#172033;font:inherit;font-size:16px}
button,select,.reveal>summary{min-height:44px}.card-indexes button,.question-index button{min-width:44px;min-height:44px}.question-index,.card-indexes{flex-wrap:wrap}button:focus-visible,a:focus-visible,summary:focus-visible,select:focus-visible,textarea:focus-visible,input:focus-visible,.diagram-scroll:focus-visible{outline:3px solid #1d4ed8;outline-offset:3px}#activity-title{scroll-margin-top:20px}
#activity-content{font-family:var(--reading-font,"Segoe UI",Arial,sans-serif);letter-spacing:var(--reading-spacing,normal);line-height:var(--reading-line,1.8)}#activity-content .notion p,#activity-content .content-block p,#activity-content .exercise p,#activity-content .revealed p,#activity-content .content-block li,#activity-content .summary-list li>div,#activity-content .pitfall p,#activity-content .method-list li,#activity-content .book-text,#activity-content .book-text p,#activity-content .check-answer,#activity-content .exercise textarea{font-size:var(--reading-size,1rem);line-height:var(--reading-line,1.8)}#activity-content .flash-card strong{font-size:calc(var(--reading-size,1rem)*1.4);line-height:var(--reading-line,1.8)}#activity-content .math-notation{font-family:"Cambria Math","STIX Two Math","Latin Modern Math",serif;letter-spacing:normal}#activity-content .notion{overflow-wrap:anywhere}.app-shell,.main-shell,.activity-column,.activity,#activity-content{min-width:0}
body[data-access-contrast=strong]{--line:#64748b;--accent:#1e40af!important;--strong:#172554!important;--tint:#eff6ff!important;color:#0f172a;background:#fff}body[data-access-contrast=strong] .chapter,body[data-access-contrast=strong] .eyebrow,body[data-access-contrast=strong] .breadcrumbs,body[data-access-contrast=strong] .check-label,body[data-access-contrast=strong] .response-format,body[data-access-contrast=strong] .step-number,body[data-access-contrast=strong] .edition,body[data-access-contrast=strong] .school-year,body[data-access-contrast=strong] .notion p{color:#0f172a}
@media(max-width:760px){.access-fields{grid-template-columns:1fr}.access-quick{padding:14px}.access-settings{padding:18px}.access-quick>p{font-size:13px}.access-actions{align-items:stretch}.access-actions>a{font-size:13px}.sidebar-bottom .access-link{display:block}.access-link{padding:10px;font-size:13px}.question-index button,.card-indexes button{width:44px;height:44px}.notion-index{grid-template-columns:1fr}.access-settings h1{font-size:26px}}
@media print{.access-quick,.access-link{display:none!important}}
body .primary,body .secondary,body .text-button,body .notion-index button,body .mode-switch button,body .reading-navigation button{min-height:44px}.access-context-link{display:inline-flex;align-items:center;min-height:44px;padding:8px;font-size:14px;color:#334155;margin-left:auto}.context-edition{margin-left:12px}@media(max-width:760px){.access-context-link{font-size:13px;padding:6px}.breadcrumbs{flex-wrap:wrap;min-width:0}.context-bar{gap:8px}}
.answer-input-label{display:block;margin:1.2rem 0 .45rem;font-size:15px;color:#172033}.answer-input-hint{margin:0 0 .8rem;color:#475569;font-size:14px;line-height:1.7}.answer-input-field{display:block;width:100%;min-width:0;box-sizing:border-box;border:1px solid #94a3b8;border-radius:10px;background:#fff;color:#172033;padding:13px;font:inherit;font-size:16px;min-height:48px}.answer-input-field::placeholder{color:#64748b;opacity:1}.answer-input-field:focus-visible{outline:3px solid #4f46e5;outline-offset:2px}