:root{--bg:#f7f9ff;--surface:#ffffff;--line:#d8def0;--text:#172443;--muted:#52617c;--lime:#6832d6;--blue:#006f86}*{box-sizing:border-box}html{scroll-behavior:smooth;scroll-padding-top:90px}body{margin:0;font:16px/1.85 system-ui,-apple-system,"Tahoma",sans-serif;background:var(--bg);color:var(--text)}a{color:inherit;text-decoration:none}button,input,select,textarea{font:inherit}button,a,input,select,textarea{touch-action:manipulation}button{cursor:pointer}button:focus-visible,a:focus-visible,input:focus-visible,select:focus-visible,textarea:focus-visible{outline:3px solid var(--lime);outline-offset:3px}header{display:flex;align-items:center;justify-content:space-between;gap:24px;padding:20px max(5vw,20px);border-bottom:1px solid var(--line)}.brand{font-size:23px;font-weight:900;letter-spacing:.06em}.brand small{display:block;font-size:12px;color:var(--lime);letter-spacing:.12em}nav{display:flex;flex-wrap:wrap;gap:24px;font-size:14px;color:var(--muted)}nav a:hover{color:var(--lime)}main{max-width:1240px;margin:auto;padding:0 28px}section{margin:64px 0}.intro{display:grid;grid-template-columns:1.4fr 1fr;gap:70px;align-items:center;margin-top:52px}.eyebrow,.label{font-size:13px;letter-spacing:.11em;font-weight:700;color:var(--lime)}h1{font-size:clamp(36px,4.6vw,62px);line-height:1.35;margin:18px 0;font-weight:800;letter-spacing:-.035em}h1 span{color:var(--lime)}.lead{font-size:18px;color:var(--muted);max-width:610px}.button{display:inline-flex;align-items:center;justify-content:center;border:1px solid var(--lime);border-radius:8px;padding:10px 20px;background:var(--lime);color:#ffffff;font-weight:700;font-size:16px;min-height:48px}.secondary{color:var(--text);background:transparent;border-color:#9cacc8}.button:hover{filter:brightness(1.08)}.course-note{background:var(--surface);border:1px solid var(--line);padding:32px;border-radius:16px;border-top:5px solid var(--lime)}.tag{font-size:14px;color:var(--blue)}.course-note 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span{color:var(--blue);font-size:14px;min-width:24px}.lesson-tab.active{background:var(--lime);color:#ffffff;font-weight:700}.lesson-tab.active span{color:#ffffff}.lesson-tab:hover:not(.active){background:var(--surface);color:var(--text)}.lesson-content{background:var(--surface);border:1px solid var(--line);padding:34px;border-radius:12px;align-self:start}.lesson-content .lesson-no{color:var(--lime);font-size:14px}.lesson-content h2{font-size:30px}.lesson-content h3{margin-top:24px}.lesson-content li{padding-left:6px;margin:8px 0}.homework{margin-top:28px;border-left:3px solid var(--lime);padding:2px 18px;background:#eef0ff}.pass{color:var(--blue)}.practice{display:grid;grid-template-columns:1fr 1.4fr;gap:50px;padding:34px;background:#e7f5ff;border-radius:12px}.practice ol{margin:0;padding-left:24px}.practice li{padding:8px 0 14px 8px}.practice b{display:block;color:var(--lime)}.lab-grid,.two-col{display:grid;grid-template-columns:1fr 1fr;gap:24px}.panel{background:var(--surface);border:1px solid var(--line);border-radius:12px;padding:28px}.fields{display:grid;grid-template-columns:1fr 1fr;gap:18px}.four{grid-template-columns:repeat(4,1fr)}label{display:block;font-size:14px;color:var(--muted)}input,select,textarea{width:100%;background:#ffffff;border:1px solid #a3aec6;border-radius:6px;color:var(--text);padding:10px 12px;margin-top:6px;min-width:0;line-height:1.5;font-size:16px}textarea{min-height:100px;resize:vertical}input::placeholder,textarea::placeholder{color:#63718b}.result{padding:20px 0;color:var(--lime);font-size:28px;font-weight:750;line-height:1.5}.result small{display:block;color:var(--muted);font-size:16px;margin-top:10px;font-weight:400}.table-wrap{overflow-x:auto;margin:24px 0}table{border-collapse:collapse;width:100%;text-align:left}th,td{padding:12px;border-bottom:1px solid var(--line);vertical-align:top}th{font-size:14px;color:var(--blue)}td:first-child{font-weight:700;width:105px}td textarea{min-height:65px;min-width:160px}.resource-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:18px}.resource-grid a{border-top:2px solid var(--lime);background:var(--surface);padding:22px 18px;border-radius:0 0 8px 8px}.resource-grid b{display:block;font-size:18px}.resource-grid span{font-size:14px;color:var(--muted)}.integration{border:1px solid var(--line);border-radius:16px;padding:36px}.integration>p{max-width:900px}.actions{display:flex;flex-wrap:wrap;gap:12px;align-items:center;margin:24px 0}.textlink{color:var(--lime);text-decoration:underline;padding:10px}summary{cursor:pointer;font-size:16px;padding:12px 0}pre{white-space:pre-wrap;font:15px/1.85 system-ui,sans-serif;background:#edf1ff;padding:22px;border-radius:8px;overflow-wrap:anywhere}footer{padding:28px max(5vw,20px);border-top:1px solid var(--line);display:flex;justify-content:space-between;gap:20px;flex-wrap:wrap;font-size:14px;color:var(--muted)}footer b{color:var(--lime)}@media(max-width:900px){.intro{gap:30px;grid-template-columns:1.2fr 1fr}.classroom{grid-template-columns:260px 1fr}.four,.resource-grid{grid-template-columns:1fr 1fr}.lesson-content{padding:24px}.practice{gap:25px}}@media(max-width:650px){header{align-items:flex-start;flex-direction:column;gap:12px;padding:18px 20px}nav{gap:12px 20px}.intro,.start,.classroom,.practice,.lab-grid,.two-col{grid-template-columns:1fr}.intro{margin-top:30px;gap:28px}.intro h1{font-size:38px}main{padding:0 18px}section{margin:42px 0}.course-note{padding:24px}.section-title{align-items:flex-start;flex-direction:column;gap:0}.section-title p{margin:0}.lesson-list{display:grid;grid-template-columns:1fr 1fr;gap:5px}.lesson-tab{padding:10px 8px;font-size:14px;gap:7px}.lesson-tab span{min-width:18px}.panel,.integration,.practice{padding:22px}.fields{grid-template-columns:1fr}.four{grid-template-columns:1fr 1fr}.resource-grid{grid-template-columns:1fr 1fr}.result{font-size:25px}.lesson-content h2{font-size:25px}.actions .button{width:100%}footer{flex-direction:column}.sheet{padding:16px}}@media print{body{color:#111;background:white;font:12pt/1.5 sans-serif}header,footer,main>section:not(#worksheet),#print{display:none!important}main{padding:0}#worksheet{margin:0}.panel{background:white;border:0;padding:0}input,textarea{color:#111;background:white;border:1px solid #bbb;font-size:11pt}th{color:#111}th,td{border-color:#aaa}.muted{color:#555}.section-title h2{color:#111}.eyebrow{color:#111}.four{grid-template-columns:repeat(4,1fr)}.fields{grid-template-columns:1fr 1fr}.table-wrap{overflow:visible}td textarea{min-width:0}}

/* Bright stage-ready course identity */
header{background:#fff;border-top:5px solid #6832d6}.brand{color:#422394}.intro{padding:20px 0}.intro h1 span{color:#6832d6}.course-note{background:linear-gradient(135deg,#eaf7ff,#f5eaff);border-top-color:#00a2bc;box-shadow:0 12px 32px #49348d0c}.tag{color:#075e76}.mini b{border-color:#0095ad}.start{border-radius:12px;padding:24px;background:#eaf5ff;border:0}.lesson-content{box-shadow:0 10px 30px #27374e08}.lesson-tab.active{box-shadow:0 5px 16px #6832d620}.practice{border-left:5px solid #00a2bc}.practice b{color:#4332a2}.homework{background:#f1edff}.resource-grid a{transition:transform .15s,box-shadow .15s;box-shadow:0 6px 20px #29375808}.resource-grid a:hover{transform:translateY(-3px);box-shadow:0 10px 22px #29375815}.resource-grid a:nth-child(1){border-color:#6832d6}.resource-grid a:nth-child(2){border-color:#0095ad}.resource-grid a:nth-child(3){border-color:#e65183}.resource-grid a:nth-child(4){border-color:#db8a10}.integration{background:linear-gradient(135deg,#f0eaff,#e7f7ff)}footer{background:#fff}.button.secondary{color:var(--text)}.result{color:#5422b8}@media print{.start,.integration{background:white}.sheet{box-shadow:none}.result{color:#111}}