body{margin:0;padding:24px;background:#ece7f1;color-scheme:light}
.page{--paper:#faf8fc;--ink:#31213f;--secondary:#71647b;--panel:#fff;--soft:#f0eaf7;--line:#e8dfed;--accent:#704096;--gold:#ad7400;--gold-bg:#fff3cb;color-scheme:light;background:var(--paper);color:var(--ink);font-family:Arial,Helvetica,sans-serif;font-size:16px;line-height:1.6;padding:30px 36px;border-radius:22px;max-width:960px;margin:0 auto;box-sizing:border-box;position:relative;overflow:hidden}
.page *{box-sizing:border-box}
.page a{color:inherit}
.page .crumbs{margin:0 0 14px;font-size:13px}
.page .crumbs a{color:var(--accent);text-decoration:none;font-weight:700}
.page .crumbs a:hover{text-decoration:underline}
.page .masthead{display:flex;justify-content:space-between;align-items:center;gap:20px;padding-bottom:24px;border-bottom:1px solid var(--line)}
.page .brand{font-size:24px;font-weight:700;letter-spacing:-.7px;text-decoration:none}
.page .brand em,.page h1 em{font-family:Georgia,'Times New Roman',serif;font-weight:400;color:var(--accent)}
.page .hero{padding:44px 0 30px;max-width:760px}
.page .eyebrow{font-size:12px;letter-spacing:2.1px;color:var(--accent);font-weight:700;text-transform:uppercase}
.page h1{font-family:Georgia,'Times New Roman',serif;font-size:clamp(32px,5.6vw,56px);line-height:1.12;font-weight:400;letter-spacing:-1.5px;margin:14px 0 17px}
.page .subtitle{color:var(--secondary);margin:0;font-size:18px;line-height:1.6}
.page .stars{position:absolute;top:150px;right:40px;font-size:46px;line-height:1;color:#ffd666;letter-spacing:6px;pointer-events:none;user-select:none}
.page h2{font-family:Georgia,'Times New Roman',serif;font-size:27px;font-weight:400;margin:0 0 16px}
.page .projects{padding:8px 0 4px}
.page .grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px}
.page .card{display:flex;flex-direction:column;gap:10px;padding:22px;background:var(--panel);border:1px solid var(--line);border-radius:16px;text-decoration:none;color:var(--ink);transition:border-color .15s,box-shadow .15s,transform .15s}
.page .card:hover,.page .card:focus-visible{border-color:var(--accent);box-shadow:0 8px 24px rgba(112,64,150,.12);transform:translateY(-2px);outline:none}
.page .tag{align-self:flex-start;font-size:11px;letter-spacing:1.4px;font-weight:700;text-transform:uppercase;color:var(--accent);background:var(--soft);padding:4px 10px;border-radius:99px}
.page .tag.soon{color:var(--gold);background:var(--gold-bg)}
.page .card h3{font-family:Georgia,'Times New Roman',serif;font-size:25px;font-weight:400;line-height:1.2;margin:2px 0 0;letter-spacing:-.4px}
.page .card h3 em{color:var(--accent)}
.page .card p{margin:0;color:var(--secondary);font-size:15px;line-height:1.55;flex:1}
.page .go{margin-top:6px;font-weight:700;color:var(--accent);font-size:15px}
.page .empty{padding:26px;background:var(--soft);border-left:3px solid var(--accent);border-radius:0 14px 14px 0;margin:6px 0 4px}
.page .empty strong{display:block;font-family:Georgia,serif;font-weight:400;font-size:22px;margin-bottom:6px}
.page .empty p{margin:0;color:var(--secondary)}
.page footer{border-top:1px solid var(--line);padding-top:20px;margin-top:38px;color:var(--secondary);font-size:13px;display:grid;gap:6px}
.page footer small{font-size:12px;line-height:1.5;color:var(--secondary)}
@media(max-width:700px){.page{padding:24px 20px}.page .grid{grid-template-columns:1fr}.page .stars{display:none}.page .hero{padding:32px 0 22px}.page .subtitle{font-size:17px}}
@media(max-width:420px){body{padding:12px}}
@media(prefers-reduced-motion:reduce){.page .card{transition:none}.page .card:hover{transform:none}}

/* ---- lesson pages: topics, accordions, content blocks ---- */
.page .hero.slim{padding:34px 0 18px}
.page .pills{display:flex;flex-wrap:wrap;gap:8px;margin-top:20px}
.page .pills a{font-size:14px;font-weight:700;color:var(--accent);background:var(--soft);padding:9px 16px;border-radius:99px;text-decoration:none;min-height:40px;display:inline-flex;align-items:center}
.page .pills a:hover{background:var(--accent);color:#fff}
.page .topic{padding:30px 0 6px;border-top:1px solid var(--line);margin-top:22px}
.page .topic h2{margin:10px 0 6px}
.page .lead{margin:0 0 18px;color:var(--secondary);max-width:760px}
.page .toolbar{display:flex;flex-wrap:wrap;gap:10px;align-items:center;margin:0 0 18px}
.page .tool{font:inherit;font-size:14px;border:1px solid var(--line);border-radius:10px;padding:9px 14px;background:var(--panel);color:var(--ink);min-height:44px;cursor:pointer}
.page .tool:hover{border-color:var(--accent)}
.page .btn{font:inherit;font-size:14px;font-weight:700;border-radius:10px;padding:10px 16px;background:var(--accent);color:#fff;min-height:44px;text-decoration:none;display:inline-flex;align-items:center;gap:8px}
.page .btn:hover{background:#5d3380}
.page .btn small{font-weight:400;opacity:.85;font-size:12px}
.page .accs{display:grid;gap:8px}
.page details.slide{background:var(--panel);border:1px solid var(--line);border-radius:12px;overflow:hidden}
.page details.slide[open]{border-color:#cdb9dd}
.page details.slide>summary{list-style:none;cursor:pointer;display:grid;grid-template-columns:auto minmax(0,1fr) 22px;gap:12px;align-items:center;padding:13px 16px;min-height:50px}
.page details.slide>summary::-webkit-details-marker{display:none}
.page details.slide>summary::after{content:"+";font-size:22px;line-height:1;color:var(--accent);text-align:center}
.page details.slide[open]>summary::after{content:"–"}
.page details.slide>summary:hover{background:var(--soft)}
.page details.slide>summary:focus-visible{outline:2px solid var(--accent);outline-offset:-2px}
.page .slide .n{font-size:12px;font-weight:700;color:var(--accent);background:var(--soft);border-radius:8px;padding:3px 8px;min-width:30px;text-align:center}
.page .slide .t{font-weight:700;line-height:1.35}
.page .slide .body{padding:4px 18px 20px 18px;border-top:1px solid var(--line)}
.page .slide .body p{margin:14px 0 0;line-height:1.6}
.page .slide .body h4{margin:0 0 8px;font-size:16px}
.page .subhead{font-family:Georgia,'Times New Roman',serif;font-weight:400;font-size:22px;margin:18px 0 2px;color:var(--ink)}
.page .list{margin:12px 0 0;padding-left:20px;line-height:1.6}
.page .list li{margin:5px 0}
.page .callout{margin:16px 0 0;padding:13px 16px;background:var(--soft);border-left:3px solid var(--accent);border-radius:0 10px 10px 0;font-weight:700;line-height:1.5}
.page .centered{text-align:center}
.page ol.steps,.page ol.flow{list-style:none;margin:14px 0 0;padding:0;display:grid;gap:10px}
.page ol.steps li{display:grid;grid-template-columns:30px minmax(0,1fr);gap:12px;align-items:start;padding:12px 14px;background:var(--paper);border:1px solid var(--line);border-radius:10px;line-height:1.55}
.page ol.steps .num,.page ol.flow .num{display:flex;align-items:center;justify-content:center;width:28px;height:28px;border-radius:50%;background:var(--soft);color:var(--accent);font-weight:700;font-size:14px}
.page ol.steps li strong{display:block}
.page ol.steps li span:not(.num){display:block;color:var(--secondary)}
.page ol.flow{grid-template-columns:repeat(4,minmax(0,1fr))}
.page ol.flow li{display:flex;flex-direction:column;align-items:center;text-align:center;gap:4px;padding:14px 10px;background:var(--paper);border:1px solid var(--line);border-radius:10px}
.page ol.flow li span:not(.num){color:var(--secondary);font-size:14px;line-height:1.4}
.page .cards2{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px;margin-top:14px}
.page .mini{padding:14px 16px;background:var(--paper);border:1px solid var(--line);border-radius:10px}
.page .mini .list{margin-top:6px}
.page ul.pm{list-style:none;margin:6px 0 0;padding:0;display:grid;gap:8px}
.page ul.pm li{padding-left:28px;position:relative;line-height:1.5}
.page ul.pm li:before{position:absolute;left:0;top:0;width:20px;text-align:center;font-weight:700}
.page ul.pm .plus:before{content:"+";color:#2f7d4f}
.page ul.pm .minus:before{content:"–";color:#b5532f}
.page .stats{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px;margin-top:16px}
.page .stats div{padding:20px;background:var(--soft);border-radius:12px;text-align:center}
.page .stats strong{display:block;font-family:Georgia,serif;font-weight:400;font-size:40px;line-height:1.1;color:var(--accent)}
.page .stats span{color:var(--secondary)}
.page dl.defs{margin:14px 0 0;display:grid;gap:10px}
.page dl.defs dt{font-weight:700;margin:0}
.page dl.defs dd{margin:2px 0 0;color:var(--secondary);line-height:1.55}
.page ul.chips{list-style:none;margin:14px 0 0;padding:0;display:flex;flex-wrap:wrap;gap:8px}
.page ul.chips li{padding:8px 14px;background:var(--soft);border-radius:99px;font-size:14px;font-weight:700}
.page figure{margin:16px 0 0}
.page figure img{display:block;width:100%;height:auto;border-radius:10px;border:1px solid var(--line)}
.page blockquote.quote{margin:14px 0 0;padding:4px 18px 16px;background:var(--paper);border-left:3px solid var(--gold);border-radius:0 10px 10px 0}
.page blockquote.quote p{margin:12px 0 0;line-height:1.6}
.page .flow3{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px;margin-top:12px}
.page .fcol{padding:12px;background:var(--paper);border:1px solid var(--line);border-radius:10px}
.page .fcol h4{margin:0 0 10px;padding:8px 10px;background:var(--accent);color:#fff;border-radius:8px;font-size:14px;text-align:center}
.page .fcol ol{list-style:none;margin:0;padding:0;display:grid;gap:8px}
.page .fcol li{padding:9px 10px;background:#fff;border:1px solid var(--line);border-radius:8px;font-size:14px;text-align:center;line-height:1.4}
.page .fcol li:not(:last-child):after{content:"↓";display:block;color:var(--accent);margin-top:6px;font-weight:700}
.page .materials .dlgrid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px}
.page .dlcard{display:flex;flex-direction:column;gap:6px;padding:18px;background:var(--soft);border-radius:14px;align-items:flex-start}
.page .dlcard strong{font-family:Georgia,serif;font-weight:400;font-size:22px}
.page .dlcard span{color:var(--secondary);font-size:15px;margin-bottom:6px}
@media(max-width:700px){.page ol.flow,.page .flow3,.page .cards2,.page .stats,.page .materials .dlgrid{grid-template-columns:1fr}.page .slide .body{padding:2px 14px 18px}.page details.slide>summary{padding:12px}}
.page figure.narrow{max-width:460px;margin-left:auto;margin-right:auto}
.page .tablewrap{margin-top:14px;overflow-x:auto;-webkit-overflow-scrolling:touch;border-radius:10px;border:1px solid var(--line)}
.page table.journal{border-collapse:collapse;width:100%;min-width:760px;font-size:13px}
.page table.journal th{background:#1f5a3c;color:#fff;padding:9px 8px;text-align:center;font-weight:700;line-height:1.25;border-right:1px solid rgba(255,255,255,.25)}
.page table.journal td{height:42px;border-top:1px solid var(--line);border-right:1px solid var(--line);background:#fff}
.page figure a{display:block;cursor:zoom-in}
.page figure.scheme{margin-top:4px}
.page details.textver{margin-top:12px;border:1px dashed #cdb9dd;border-radius:10px;background:var(--paper)}
.page details.textver summary{cursor:pointer;list-style:none;padding:10px 14px;font-size:14px;font-weight:700;color:var(--accent);min-height:44px;display:flex;align-items:center}
.page details.textver summary::-webkit-details-marker{display:none}
.page details.textver summary::before{content:"+";margin-right:8px;font-size:18px}
.page details.textver[open] summary::before{content:"–"}
.page details.textver .tv{padding:0 14px 14px}
.page details.textver .tv>p:first-child{margin-top:4px}
.page .kicker{margin:14px 0 0;font-size:13px;color:var(--secondary)}
.page .disclaimer{margin:14px 0 0;font-size:12px;font-style:italic;color:var(--secondary);line-height:1.5}
.page .ba{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px;margin-top:14px}
.page .bacard{padding:14px;background:var(--paper);border:1px solid var(--line);border-radius:12px;text-align:center}
.page .bacard strong{display:block;font-family:Georgia,serif;font-weight:400;font-size:20px;margin-bottom:8px}
.page .bacard .pair{display:flex;align-items:flex-end;justify-content:center;gap:10px}
.page .bacard .who{display:flex;flex-direction:column;align-items:center;gap:4px;font-size:12px;color:var(--secondary);font-weight:700}
.page .bacard .arrow{font-size:22px;color:var(--accent);padding-bottom:40px}
.page svg.person{width:62px;height:124px}
.page svg.person circle,.page svg.person path{fill:var(--soft);stroke:var(--accent);stroke-width:2;stroke-linejoin:round}
@media(max-width:700px){.page .ba{grid-template-columns:1fr}}
/* ---- homework checklist and materials ---- */
.page .zan{margin-top:32px}
.page .slidesh{font-family:Georgia,'Times New Roman',serif;font-weight:400;font-size:22px;margin:26px 0 12px}
.page .hw{margin:6px 0 18px;padding:18px 18px 14px;background:#fff;border:1px solid var(--line);border-left:4px solid var(--gold);border-radius:12px}
.page .hw h3{font-family:Georgia,'Times New Roman',serif;font-weight:400;font-size:24px;margin:0}
.page .hwsub{margin:2px 0 8px;color:var(--secondary);font-size:14px}
.page ul.hwlist{list-style:none;margin:0;padding:0;display:grid;gap:4px}
.page label.hwitem{display:grid;grid-template-columns:28px minmax(0,1fr);gap:12px;align-items:start;padding:10px 6px;min-height:44px;cursor:pointer;border-radius:8px;line-height:1.5}
.page label.hwitem:hover{background:var(--paper)}
.page label.hwitem input{position:absolute;opacity:0;width:1px;height:1px}
.page label.hwitem .box{width:26px;height:26px;border:2px solid var(--accent);border-radius:7px;background:#fff;display:flex;align-items:center;justify-content:center;margin-top:1px;transition:background .12s}
.page label.hwitem input:checked+.box{background:var(--accent)}
.page label.hwitem input:checked+.box::after{content:"✓";color:#fff;font-weight:700;font-size:17px;line-height:1}
.page label.hwitem input:focus-visible+.box{outline:3px solid #cdb9dd;outline-offset:2px}
.page label.hwitem input:checked~.txt{color:var(--secondary)}
.page .hwnote{margin:8px 0 0;font-size:12px;color:var(--secondary)}
.page .mats{margin:0 0 6px}
.page .mats>strong{display:block;margin-bottom:8px}
.page .matrow{display:flex;flex-wrap:wrap;gap:10px}
.page .btn.alt{background:#fff;color:var(--accent);border:1px solid var(--accent)}
.page .btn.alt:hover{background:var(--soft)}
.page .sublead{margin-top:2px}
.page h4.qh{margin:16px 0 0;font-size:15px}
.page img.logo-mark{position:absolute;top:140px;right:40px;width:92px;height:92px;border-radius:22px;box-shadow:0 8px 22px rgba(112,64,150,.22);pointer-events:none;user-select:none}
@media(max-width:700px){.page img.logo-mark{display:none}}