:root{color-scheme:light;--paper:#f8f5ef;--surface:#fffdf9;--ink:#2b211b;--muted:#655b51;--line:#e7ded2;--rust:#a33e1f;--dark:#342019;--orange:#ffc17c;--soft:#f9e7d6;--radius:19px;font-family:system-ui,-apple-system,"Segoe UI",sans-serif}
*{box-sizing:border-box}body{margin:0;background:var(--paper);color:var(--ink);line-height:1.5}a{color:inherit}button,textarea{font:inherit}button{cursor:pointer}button:disabled{cursor:default;opacity:.52}a:focus-visible,button:focus-visible,summary:focus-visible,input:focus-visible,textarea:focus-visible{outline:3px solid #bd4b1e;outline-offset:4px}h1,h2,h3,p{margin:0}p + p{margin-top:.85rem}h1,h2,h3{line-height:1.16}h1,h2{font-family:Georgia,"Times New Roman",serif;font-weight:500;letter-spacing:-.045em}i[data-icon]{display:inline-flex;flex:none;width:20px;height:20px;font-style:normal}i svg{width:100%;height:100%;stroke:currentColor}.skip{position:fixed;z-index:5;top:-90px;left:10px;background:var(--surface);padding:12px}.skip:focus{top:8px}
.layout{display:grid;grid-template-columns:235px minmax(0,1fr);min-height:100dvh}.sidebar{background:var(--surface);border-right:1px solid var(--line);position:sticky;top:0;height:100dvh;padding:26px 17px 16px;display:flex;flex-direction:column;gap:48px}.brand{display:flex;gap:10px;align-items:center;text-decoration:none;padding:0 5px}.brand img{display:block;border-radius:8px;object-fit:cover}.brand strong{font-size:1.12rem;letter-spacing:.09em;display:block}.brand small{display:block;font-size:.73rem;color:var(--muted);white-space:nowrap}.overline{font-size:.69rem;letter-spacing:.15em;font-weight:800;color:var(--muted);margin-bottom:9px}.nav-group>.overline{padding-left:11px}.accent{color:var(--rust)}nav{display:grid;gap:5px}nav a{display:flex;align-items:center;gap:10px;padding:11px 10px;border-radius:9px;color:var(--muted);font-size:.87rem;font-weight:680;text-decoration:none}nav a:hover,nav a[aria-current]{background:var(--soft);color:#8d3116}nav a[aria-current]{box-shadow:inset 3px 0 0 #bd502b}.sidebar-bottom{margin-top:auto}.progress-card{border:1px solid var(--line);background:var(--paper);border-radius:12px;padding:12px}.progress-card p:nth-child(2){font-size:.75rem;display:flex;justify-content:space-between;gap:4px}.progress-card p:nth-child(2) span{color:var(--muted)}.track{height:5px;background:#e7d7c8;border-radius:4px;margin-top:8px;overflow:hidden}.track span{background:var(--rust);display:block;height:100%;width:0}.sidebar-foot{padding:13px 0 0;text-align:center;color:var(--muted);font-size:.68rem}
main{width:100%;max-width:1480px;min-width:0;margin:auto;padding:0 clamp(20px,4vw,62px)}.topbar{display:flex;align-items:center;justify-content:space-between;gap:10px;min-height:76px}.breadcrumb{font-size:.85rem;color:var(--muted)}.breadcrumb span{margin:0 .35rem;color:#907e71}.breadcrumb strong{color:var(--ink)}.term{font-size:.69rem;font-weight:800;letter-spacing:.11em;color:var(--muted)}.term b,.footer b{color:var(--rust);padding:0 3px}
.hero{position:relative;overflow:hidden;isolation:isolate;border-radius:23px;display:grid;grid-template-columns:minmax(0,1.08fr) minmax(0,1fr);background:linear-gradient(116deg,#301b17,#552b20);color:#fff7e9;min-height:350px}.hero-content{padding:clamp(30px,4.4vw,65px);padding-right:0;z-index:1}.hero-kicker{font-size:.72rem;letter-spacing:.16em;font-weight:800;color:#ffc78e;display:flex;align-items:center;gap:8px}.hero-kicker span{width:7px;height:7px;background:#ffae62;border-radius:100%;box-shadow:0 0 0 4px #fba65926}.hero h1{font-size:clamp(2.6rem,5.25vw,5.4rem);line-height:.99;margin:17px 0}.hero-content>p:not(.hero-kicker){font-size:1rem;max-width:38ch;color:#efdbce}.hero-art{position:relative;min-width:0;display:flex;align-items:center;justify-content:center;padding:14px 10px}.hero-art svg{width:100%;height:auto;mask-image:linear-gradient(90deg,transparent,#000 13%);overflow:visible}.art-label{position:absolute;right:24px;bottom:20px;color:#ffd2a8;display:flex;align-items:center;gap:8px;letter-spacing:.15em;font-size:.63rem;font-weight:750}.art-label span{width:19px;height:1px;background:currentColor}.actions{display:flex;align-items:center;flex-wrap:wrap;gap:10px;margin-top:24px}.btn{display:inline-flex;align-items:center;justify-content:center;gap:8px;min-height:44px;border:1px solid transparent;border-radius:9px;padding:9px 14px;text-decoration:none;font-size:.85rem;font-weight:750;line-height:1.2}.btn i{width:17px;height:17px}.btn.bright{background:var(--orange);color:#392118}.btn.bright:hover{background:#ffd9ae}.btn.outline{border-color:#bb8f76;color:inherit;background:transparent}.btn.outline:hover{background:#ffffff19}.btn.primary{background:var(--rust);color:white}.btn.primary:hover{background:#812e16}.btn.secondary{border-color:#d9cabc;background:var(--surface);color:var(--ink)}.btn.secondary:hover{background:var(--soft)}
.summary{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));border:1px solid var(--line);background:var(--surface);border-radius:14px;margin-top:18px}.summary>div{display:flex;align-items:center;gap:12px;padding:16px 18px}.summary>div+div{border-left:1px solid var(--line)}.summary i,.quick i:first-child{background:var(--soft);color:var(--rust);width:36px;height:36px;padding:8px;border-radius:9px}.summary strong,.summary small{display:block}.summary strong{font-size:.9rem}.summary small{color:var(--muted);font-size:.75rem}
.block{margin-top:33px}.section-head{display:flex;justify-content:space-between;gap:12px;align-items:end;margin-bottom:14px}.section-head h2,.page-head h1{font-size:clamp(2rem,4.5vw,3.7rem)}.section-head h2{font-size:clamp(1.9rem,3.4vw,2.7rem)}.text-link{display:inline-flex;align-items:center;gap:6px;color:var(--rust);font-size:.83rem;font-weight:750;text-decoration-thickness:1px;text-underline-offset:3px}.text-link i{width:16px;height:16px}.feature{display:grid;grid-template-columns:auto minmax(0,1fr) auto;gap:17px;align-items:center;padding:20px;background:var(--surface);border:1px solid var(--line);border-radius:var(--radius)}.feature-num{background:var(--soft);color:#993914;border-radius:13px;min-width:76px;min-height:76px;display:grid;place-items:center;font:2.6rem Georgia,serif}.badge{display:inline-flex;align-items:center;background:#f7e7da;color:#8d3116;padding:5px 9px;border-radius:5px;letter-spacing:.07em;font-size:.65rem;font-weight:850;line-height:1.1}.feature h3{margin:7px 0 5px}.feature p,.quick p,.card p,.page-head p,.content-panel p,.content-panel li{color:var(--muted)}.feature p,.quick p{font-size:.87rem}.quick-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px}.quick{display:flex;align-items:center;gap:11px;text-decoration:none;padding:15px;border:1px solid var(--line);border-radius:13px;background:var(--surface)}.quick:hover{border-color:#c28b6f}.quick i:last-child{margin-left:auto;color:var(--rust)}.quick h3{font-size:1rem;margin-bottom:4px}.footer{display:flex;justify-content:space-between;gap:12px;color:var(--muted);font-size:.75rem;padding:22px 0;margin-top:26px;border-top:1px solid var(--line)}
.page-head{padding:27px 0 18px}.page-head p:not(.overline){margin-top:10px;max-width:69ch}.cards{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px}.card,.content-panel{background:var(--surface);border:1px solid var(--line);border-radius:var(--radius);padding:clamp(16px,3vw,28px)}.card h2{margin:9px 0;font-size:clamp(1.65rem,3vw,2.15rem)}.card p,.card li{font-size:.92rem}.card ul{padding-left:1.1rem;margin-bottom:0}.card .btn{margin-top:15px}.content-panel h2{font-size:clamp(1.65rem,3.8vw,2.85rem);margin:8px 0 14px}.content-panel h3{margin:17px 0 7px}.content-panel li+li{margin-top:5px}.content-panel ol,.content-panel ul{padding-left:1.3rem}.panel-stack{display:grid;gap:14px}.lesson-tools,.slide-controls{display:flex;justify-content:space-between;gap:10px;align-items:center;flex-wrap:wrap}.lesson-tools{margin:0 0 14px}.lesson-grid{display:grid;grid-template-columns:minmax(0,1fr) 230px;gap:15px;align-items:start}.lesson-grid .content-panel{min-width:0}.lesson-side h2{font-size:1.4rem}.steps{display:grid;gap:6px}.step{text-align:left;padding:9px;border-radius:7px;border:1px solid var(--line);color:var(--muted);background:var(--surface);font-size:.85rem}.step[aria-current]{background:var(--soft);border-color:#d5a68e;color:#842e17;font-weight:750}.slide-body{min-height:270px}.slide-body p,.slide-body li{max-width:70ch}.slide-controls{margin-top:19px;padding-top:14px;border-top:1px solid var(--line)}.notice{padding:13px 15px;background:var(--soft);border-left:3px solid var(--rust);border-radius:6px;margin-top:15px}.notice p{color:var(--ink)}details{margin-top:14px}summary{color:var(--rust);font-weight:750;cursor:pointer}.guide{margin-top:15px}.projecting .layout{display:block}.projecting .sidebar,.projecting .topbar,.projecting .footer,.projecting .lesson-side,.projecting .guide,.projecting .page-head,.projecting .back-link{display:none}.projecting main{max-width:1320px;padding-top:22px}.projecting .lesson-tools{justify-content:flex-end}.projecting .lesson-grid{display:block}.projecting .slide-body{min-height:58vh;font-size:clamp(1.06rem,2.7vw,1.8rem)}.projecting .slide-body h2{font-size:clamp(2rem,5vw,4.5rem)}
textarea{width:100%;margin-top:7px;padding:12px;border:1px solid #bdaea0;border-radius:9px;background:#fffdfb;color:var(--ink);resize:vertical}.field-label{display:block;margin-top:17px;font-weight:750}.status{font-size:.84rem;min-height:1.25rem;margin-top:9px}.quiz fieldset{margin:13px 0;padding:14px;border:1px solid var(--line);border-radius:10px}.quiz legend{font-weight:750;padding:0 5px}.quiz label{display:flex;align-items:flex-start;gap:7px;padding:6px;border-radius:5px}.quiz label:hover{background:var(--paper)}.quiz input{accent-color:var(--rust);margin-top:5px}.quiz .feedback{font-size:.86rem;margin:5px 0 0}.resource-item+.resource-item{border-top:1px solid var(--line);margin-top:14px;padding-top:10px}.glossary{display:grid;grid-template-columns:auto 1fr;gap:9px 16px;margin-bottom:0}.glossary dt{font-weight:750}.glossary dd{margin:0;color:var(--muted)}
@media(max-width:1120px){.layout{grid-template-columns:200px minmax(0,1fr)}.sidebar{padding-left:12px;padding-right:12px}.hero-content{padding-left:28px}.hero h1{font-size:clamp(2.55rem,5.1vw,4.5rem)}.summary>div{padding:13px 10px}}
@media(max-width:825px){.layout{display:block}.sidebar{z-index:3;height:auto;border-right:0;border-bottom:1px solid var(--line);gap:9px;padding:9px 14px;position:static}.brand img{width:32px;height:38px}.brand small{font-size:.7rem}.nav-group>.overline,.sidebar-bottom{display:none}nav{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:5px}nav a{justify-content:center;padding:8px 4px;font-size:.76rem}.topbar{min-height:55px}.hero h1{font-size:clamp(2.6rem,7vw,4.8rem)}.lesson-grid{grid-template-columns:minmax(0,1fr) 190px}}
@media(max-width:560px){main{padding-inline:14px}.sidebar{padding-inline:8px}.brand{padding-left:6px}nav a{flex-direction:column;gap:4px;text-align:center;min-height:53px;font-size:.68rem}nav a[aria-current]{box-shadow:inset 0 -2px 0 #bd502b}nav i[data-icon]{width:16px;height:16px}.term{font-size:.58rem;letter-spacing:.045em}.hero{grid-template-columns:1fr;min-height:auto}.hero-content{padding:24px 21px 0}.hero h1{font-size:clamp(2.35rem,10vw,3.8rem);margin:13px 0}.hero-content>p:not(.hero-kicker){font-size:.9rem}.hero .actions{margin-top:17px}.hero-art{height:147px;padding:0;overflow:hidden}.hero-art svg{width:250px;transform:translateY(0);mask-image:none}.art-label{font-size:.5rem;right:11px;bottom:7px}.summary>div{gap:5px;flex-direction:column;align-items:flex-start;padding:9px 7px}.summary strong{font-size:.72rem}.summary small{font-size:.66rem}.summary i{width:28px;height:28px;padding:5px}.block{margin-top:24px}.feature{grid-template-columns:48px minmax(0,1fr);padding:13px;gap:10px}.feature-num{min-width:48px;min-height:52px;font-size:1.7rem}.feature .btn{grid-column:2;justify-self:start}.feature h3{font-size:1rem}.quick-grid,.cards,.lesson-grid{grid-template-columns:1fr}.section-head{align-items:start;flex-direction:column;gap:6px}.lesson-side{grid-row:2}.steps{grid-template-columns:repeat(2,minmax(0,1fr))}.footer{font-size:.68rem}.glossary{grid-template-columns:1fr;gap:3px}.glossary dd{margin-bottom:8px}}

.hero .start-date {margin-top:10px;color:#ffc78e;font-size:.84rem;font-weight:680}

.attempt-account{display:flex;align-items:center;justify-content:space-between;gap:10px;flex-wrap:wrap;padding:10px 14px;margin-bottom:14px;border:1px solid var(--line);border-radius:9px;background:var(--surface);font-size:.85rem}
.slide-body{min-height:0}
.lesson-question{margin-top:22px}
.lesson-question fieldset{margin:0;background:var(--paper)}
.lesson-question legend{font-size:1rem}
.lesson-question label{min-height:44px;align-items:center}
.lesson-question label:hover,.lesson-question label:has(input:checked){background:var(--soft)}
.lesson-question input{margin:0 5px 0 0}
.lesson-score{font:clamp(2.5rem,7vw,5rem) Georgia,serif;color:var(--rust)!important}
.slide-controls[hidden],.teacher-prompt,.projecting .attempt-account{display:none}
.projecting .teacher-prompt{display:block}

.research-library{margin-top:14px}
.research-input{display:block;width:100%;margin-top:7px;padding:10px 12px;border:1px solid #bdaea0;border-radius:9px;background:var(--surface);color:var(--ink);font:inherit}
@media(max-width:825px){nav{grid-template-columns:repeat(5,minmax(0,1fr))}}

.class-sequence{display:flex;flex-wrap:wrap;align-items:center;gap:8px 20px;padding:9px 13px;margin:0 0 14px;border-radius:9px;background:var(--soft);color:var(--ink);font-size:.85rem}
.class-sequence strong{color:var(--rust)}
.projecting .class-sequence{display:none}
.analysis-next h3{margin:0 0 8px}
.analysis-next .actions{margin-top:14px}
.lesson-score{margin-top:5px}

.demo-clock{display:flex;flex-wrap:wrap;justify-content:space-between;align-items:center;gap:9px 20px;margin:0 0 16px;padding:13px 16px;background:var(--soft);border:1px solid var(--line);border-radius:12px}
.demo-clock p{color:var(--muted);font-size:.86rem}
.demo-clock label{display:grid;gap:3px;font-size:.84rem;font-weight:700}
.demo-clock select{max-width:100%;min-height:40px;background:var(--surface);color:var(--ink);border:1px solid #bdaea0;border-radius:7px;padding:5px 9px;font:inherit}
.course-card h2{font-size:clamp(1.42rem,2.8vw,2rem)}
.course-status{margin-top:7px;color:var(--rust)!important;font-weight:650}
.submitted-analysis{white-space:pre-wrap;overflow-wrap:anywhere}

.course-blocks{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:8px;margin-top:13px}
.course-block{display:flex;flex-direction:column;align-items:flex-start;gap:5px;border:1px solid var(--line);border-radius:9px;padding:9px;min-width:0}
.course-block strong{font-size:.88rem}.course-block small{color:var(--muted);font-size:.76rem}.course-block .btn{margin-top:auto}
.course-locked{background:#ece8e2;color:#5b554f}.course-locked .btn:disabled{opacity:1;color:#615953;background:#e4dfd8;border-color:#d4ccc2}
@media(max-width:365px){.course-blocks{grid-template-columns:1fr}}