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var(--line);border-radius:23px;max-width:690px;margin:auto}.result-symbol{display:grid;place-items:center;width:75px;height:75px;margin:0 auto 25px;border-radius:23px;background:#eaf6f1;color:#6cab95;font-size:29px}.result-card h2{font-size:27px}.result-card .correct-count{font-size:24px;color:var(--purple);letter-spacing:-.03em;margin:12px 0 20px;font-weight:650}.result-card p{font-size:12px;line-height:1.9}.result-card .btn{margin-top:10px}.reflection-grid{display:grid;grid-template-columns:.8fr 1.2fr;gap:23px}.reflection-status{padding:30px;border-radius:20px;background:#eaf5f0;border:1px solid #d9ebe2}.reflection-status.fail{background:#faf0e9;border-color:#ecdfd3}.reflection-status h2{font-size:25px;color:#517b6b;margin:19px 0 14px}.reflection-status.fail h2{color:#a07c57}.reflection-status p{font-size:12px;color:#789486;line-height:1.9}.reflection-status.fail p{color:#a28c76}.reflection-status .icon{width:31px;height:31px;color:#82ad99}.reflection-status .btn{width:100%;font-size:11px;margin-top:10px}.reflection-form{display:grid;gap:17px}.reflection-form label{font-size:12px;color:#847492;line-height:1.9}.reflection-form textarea{min-height:210px}.toast{position:fixed;bottom:23px;left:50%;transform:translate(-50%,20px);z-index:999;background:#272d45;color:#fff;padding:13px 20px;border-radius:12px;font-size:12px;opacity:0;pointer-events:none;transition:.2s;box-shadow:0 8px 30px #161b3525;max-width:90vw;text-align:center}.toast.show{opacity:1;transform:translate(-50%,0)}[hidden]{display:none!important}.sync-badge{font-size:10px;color:#8b8599;display:flex;gap:7px;align-items:center}.sync-badge .dot{background:#a49ab8}.sync-badge.error{color:#b66a61}.page-loading{padding:60px;text-align:center;color:#91829f}.audit-check{display:flex;gap:8px;font-size:10px;line-height:1.6;color:#897997;margin:9px 0}.audit-check input{accent-color:var(--purple)}
@media(min-width:1600px){.hero{min-height:315px}.content{padding-top:36px}.subject-cover{aspect-ratio:2.1}}
@media(max-width:1180px){.shell,.lesson-shell{grid-template-columns:190px minmax(0,1fr)}.sidebar{padding:27px 16px}.masthead{padding:0 28px}.content{padding:26px 28px 40px}.hero-copy{padding-left:28px}.hero h2{font-size:32px}.catalog-grid{gap:16px}.subject-details{padding:17px}.lab-layout{grid-template-columns:minmax(0,1fr) 218px}.lab-controls{padding:16px}.auth-wrap{min-height:580px}.auth-form{padding:44px 34px}.auth-story{padding:38px 34px}.auth-story h1{font-size:34px}}
@media(max-width:960px){.shell,.lesson-shell{grid-template-columns:164px minmax(0,1fr)}.sidebar{padding:25px 11px}.sidebar .brand-lockup{gap:7px}.brand-lockup b{font-size:15px}.brand-lockup img{width:32px;height:32px}.brand-lockup small{font-size:7px}.side-nav a,.side-nav button{padding:11px;font-size:11px;gap:9px}.side-note{padding:14px 12px}.masthead{padding:0 22px}.content,.lesson-shell .content{padding:24px 22px 35px}.catalog-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.hero{min-height:265px}.hero h2{font-size:28px}.hero p{font-size:11px}.hero-copy{padding:28px 0 28px 26px}.hero-actions small{display:none}.mini-stat{padding:13px 10px;gap:9px}.mini-stat small{font-size:9px}.mini-stat b{font-size:17px}.stat-icon{width:33px;height:33px;border-radius:9px}.intro-grid{grid-template-columns:1fr}.intro-visual{display:grid;grid-template-columns:1fr 1.1fr;align-items:center}.intro-visual>div{padding:22px}.intro-visual img{height:100%;object-fit:cover}.lab-layout{grid-template-columns:1fr}.lab-controls{grid-template-columns:repeat(2,minmax(0,1fr))}.lab-controls h3{grid-column:1/-1}.lab-controls>.btn{align-self:end}.lab-controls .control.wide{grid-column:1/-1}.lab-canvas{min-height:260px}.missions{grid-template-columns:1fr}.mission{padding:13px 17px}.mission b{display:inline;margin-right:10px}.reflection-grid{grid-template-columns:1fr}.phase-nav button{gap:7px;padding:10px 8px}.phase-nav button b{width:26px;height:26px}.lesson-heading h1{font-size:27px}.lesson-card{padding:21px}.auth-story h1{font-size:30px}.auth-story{padding:35px 27px}.auth-story-bottom{gap:13px;font-size:9px}.auth-story>img{margin:0 0 -20px;width:127%}.auth-form{padding:38px 29px}.auth-form h2{font-size:26px}}
@media(max-width:700px){.shell,.lesson-shell{display:block}.sidebar{height:auto;position:relative;padding:17px 21px;display:flex;flex-direction:row;align-items:center;justify-content:space-between;border:0;gap:18px}.sidebar .brand-lockup{margin:0;flex:none}.sidebar .brand-lockup b{font-size:15px}.sidebar .brand-lockup img{width:32px;height:32px}.sidebar .brand-lockup small{font-size:7px}.sidebar .side-label,.sidebar .side-note,.sidebar .side-footer,.sidebar>.back-link{display:none}.sidebar .side-nav{display:flex;gap:6px}.side-nav a,.side-nav button{padding:10px;font-size:11px}.side-nav a span,.side-nav button span{display:none}.side-nav .icon{width:18px;height:18px}.desktop-hidden{display:block}.masthead{height:66px;padding:0 20px;background:white}.masthead-title{font-size:12px}.masthead-right{gap:9px}.user-info{font-size:10px}.user-info small{font-size:9px}.user-info.hide-mobile{display:none}.masthead .icon-button{width:35px;height:35px;border-radius:10px}.masthead .avatar{width:30px;height:30px;border-radius:10px;font-size:10px}.content,.lesson-shell .content{padding:23px 20px 33px}.greeting{margin-bottom:20px}.greeting h1{font-size:23px}.greeting p{font-size:11px}.greeting>.tag{display:none}.hero{min-height:285px;border-radius:19px;grid-template-columns:1.22fr 1fr;position:relative}.hero-copy{padding:27px 0 25px 25px}.hero h2{font-size:29px}.hero p{font-size:10px;max-width:235px;line-height:1.8}.hero .eyebrow{font-size:8px}.hero-art{position:absolute;width:270px;height:245px;right:-66px;bottom:7px;margin:0;opacity:.85}.hero-copy{max-width:290px;grid-column:1/-1}.hero-copy h2{max-width:240px}.hero-copy p{max-width:215px}.hero-actions .btn{font-size:11px;padding:10px 15px;min-height:41px}.overview-strip{gap:9px;margin:16px 0 26px}.mini-stat{padding:14px 11px;gap:7px;border-radius:12px;align-items:flex-start;flex-direction:column}.stat-icon{width:29px;height:29px;border-radius:8px}.stat-icon .icon{width:16px;height:16px}.mini-stat b{font-size:18px}.mini-stat small{font-size:9px;line-height:1.6;display:block}.catalog-toolbar h2{font-size:20px}.catalog-toolbar p{font-size:10px}.search{max-width:160px;padding:9px 10px}.search .icon{width:16px;height:16px}.search input{font-size:11px}.filter-row{gap:6px;margin:17px 0}.filter{font-size:10px;padding:7px 11px}.catalog-grid{gap:13px}.subject-cover{aspect-ratio:1.8}.subject-cover>.tag{font-size:8px;left:8px;top:8px;padding:3px 6px}.subject-cover .cover-number{right:8px;font-size:8px}.subject-details{padding:15px 13px}.subject-details h3{font-size:14px;line-height:1.35;margin-bottom:8px}.subject-details .subject-area{font-size:8px;letter-spacing:.03em}.subject-details p{font-size:10px;line-height:1.7;margin-bottom:15px}.card-bottom{font-size:10px;gap:8px;flex-wrap:wrap;padding-top:10px}.card-bottom small{font-size:8px}.guest-note{font-size:10px;align-items:flex-start;line-height:1.7}.bottom-note{font-size:9px}.auth-header{padding:24px 6%}.auth-header>small{font-size:8px}.auth-wrap{grid-template-columns:1fr;min-height:0;width:90%;border-radius:23px}.auth-story{padding:30px;min-height:270px}.auth-story .eyebrow{font-size:9px}.auth-story h1{font-size:30px;max-width:240px}.auth-story p{max-width:245px;font-size:10px;line-height:1.8}.auth-story>img{position:absolute;width:265px;right:-50px;top:48px;opacity:.45;margin:0}.auth-story-bottom{font-size:8px;gap:20px;margin-top:10px}.auth-form{padding:32px 28px}.auth-form h2{font-size:25px}.auth-form>.muted{font-size:11px;margin-bottom:24px}.auth-form .eyebrow{font-size:9px}.stack label{font-size:11px}.stack input{font-size:13px}.auth-footer{font-size:9px;padding:25px 20px}.lesson-shell .sidebar{flex-wrap:wrap;padding-bottom:0;position:sticky;top:0;z-index:40;box-shadow:0 6px 12px #13223a09}.lesson-shell .sidebar .brand-lockup{margin:0}.lesson-shell .sidebar .phase-nav{display:flex;gap:5px;overflow-x:auto;width:100%;padding:0 0 11px;scrollbar-width:none;order:3}.phase-nav button{white-space:nowrap;min-height:40px;padding:6px 9px;gap:6px;font-size:10px;border:1px solid #ffffff0b}.phase-nav button b{height:22px;width:22px;border-radius:6px;font-size:8px}.lesson-shell .masthead{height:58px}.lesson-shell .masthead-title{font-size:10px;max-width:175px;line-height:1.4}.lesson-shell .masthead .sync-badge{font-size:8px}.lesson-shell .masthead .user-info{display:none}.lesson-heading{margin-top:0;margin-bottom:20px;gap:12px}.lesson-heading h1{font-size:25px}.lesson-heading p{font-size:11px}.lesson-heading .eyebrow{font-size:8px;margin-bottom:10px}.stage-counter{font-size:8px}.stage-counter b{font-size:18px}.intro-visual{display:flex}.intro-visual img{height:180px;object-fit:cover}.intro-visual>div{padding:22px}.intro-visual h2{font-size:21px}.intro-visual p{font-size:11px}.white-card{padding:23px}.white-card h2{font-size:18px}.objective p{font-size:11px}.callout{font-size:11px;padding:17px}.lesson-grid{grid-template-columns:1fr;gap:14px}.lesson-card{padding:23px}.lesson-card h2{font-size:18px}.lesson-card p{font-size:12px}.formula{font-size:18px}.example summary{font-size:13px;padding:17px 20px}.example-inner{padding:0 20px 20px}.lab-controls{gap:16px;padding:19px}.lab-canvas{min-height:0;padding:7px 5px 0}.lab-results{padding:4px 13px 14px;gap:7px}.lab-result{padding:9px 8px}.lab-result b{font-size:15px}.lab-result span{font-size:8px}.lab-caption{font-size:9px;padding:0 14px 16px}.lab-topbar{padding:14px;font-size:9px}.lab-note .field{font-size:11px}.lab-note textarea{font-size:13px}.quiz-card{padding:23px 19px}.quiz-card h2{font-size:17px;line-height:1.6}.option{font-size:11px;padding:12px;gap:10px}.option b{width:25px;height:25px;font-size:10px}.quiz-actions .btn{font-size:10px;padding:11px 13px;gap:5px}.quiz-top{font-size:10px;flex-wrap:wrap;gap:12px}.question-dot{height:24px;width:24px;font-size:9px}.question-dots{gap:5px}.quiz-status{font-size:10px}.quiz-feedback{font-size:11px;padding:15px}.stage-footer .btn{font-size:11px;padding:10px 14px}.stage-footer>small{display:none}.stage-footer{padding-top:19px;margin-top:23px}.result-card{padding:36px 22px}.result-card h2{font-size:24px}.result-card .correct-count{font-size:22px}.result-card p{font-size:11px}.reflection-status{padding:25px}.reflection-status h2{font-size:24px}.reflection-form textarea{font-size:14px}.reflection-form label{font-size:11px}.toast{font-size:11px;bottom:18px}.lab-missions h3{font-size:15px}}
@media(max-width:360px){.content,.lesson-shell .content{padding-left:14px;padding-right:14px}.hero-copy{padding-left:20px}.hero h2{font-size:26px}.hero-art{right:-100px}.subject-details{padding:13px 11px}.subject-details h3{font-size:13px}.masthead{padding:0 14px}.catalog-toolbar{align-items:flex-start;flex-direction:column}.search{max-width:none;width:100%}.lab-controls{grid-template-columns:1fr}.auth-form{padding:27px 22px}}
@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;animation:none!important;transition:none!important}}
@media print{.sidebar,.masthead,.stage-footer,.lab-controls,.toast{display:none!important}.shell{display:block}.content{padding:0}.lesson-card,.white-card,.example{break-inside:avoid;box-shadow:none}.lesson-grid{display:block}.lesson-card{margin-bottom:15px}body{background:white}}
.sr-only{position:absolute;width:1px;height:1px;padding:0;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}.reflection-status .btn{margin:8px 8px 0 0}.reflection-form textarea{width:100%;border:1px solid var(--line);border-radius:14px;background:#fafafc;padding:16px;font:inherit;line-height:1.7;resize:vertical}.objectives{margin-top:22px}.objectives h2{margin-bottom:20px}.quiz-feedback.bad{background:#fff4e9;color:#74441c}.phase-nav{scrollbar-width:thin}
.skip:not(:focus){clip-path:inset(100%);width:1px;height:1px;padding:0;overflow:hidden}

/* v7: catalogue and forms always scroll; presentation rules are in player.css only. */
html{overflow-y:auto;overflow-x:hidden}body.catalog-page{height:auto;overflow:visible}.catalog-page .workspace{min-height:100dvh}.catalog-page .subject-card{position:relative}.catalog-page .card-bottom:after{content:"";position:absolute;inset:0}.catalog-page .subject-card:focus-within{outline:3px solid #7560d7;outline-offset:3px}[hidden]{display:none!important}


/* theme toggle v7.1 */
.theme-toggle{display:inline-flex;align-items:center;gap:10px;border:1px solid var(--line);border-radius:999px;padding:10px 14px;background:#fff;color:var(--ink);font-size:12px;font-weight:650;box-shadow:0 8px 20px rgba(20,28,65,.08)}
.theme-toggle .theme-icons{width:22px;height:22px;border-radius:999px;display:grid;place-items:center;background:linear-gradient(135deg,#ffe085,#ffbc6b);color:#7a4c09}
.theme-toggle.compact{padding:9px 12px;font-size:11px}.auth-header-actions{display:flex;align-items:center;gap:12px}
html[data-theme='dark']{--ink:#eef3ff;--muted:#98a5c1;--paper:#0a1226;--line:#25304b;--purple:#8d7cff;--purple-dark:#7764ea;--navy:#11182f;--mint:#8ce9da;--white:#101a33;--shadow:0 18px 48px rgba(4,8,23,.46)}
html[data-theme='dark'] body{background:radial-gradient(circle at 12% 10%,rgba(120,111,255,.18),transparent 28%),radial-gradient(circle at 88% 8%,rgba(48,218,196,.14),transparent 24%),var(--paper)}
html[data-theme='dark'] .masthead,html[data-theme='dark'] .mini-stat,html[data-theme='dark'] .subject-card,html[data-theme='dark'] .search,html[data-theme='dark'] .filter,html[data-theme='dark'] .auth-wrap,html[data-theme='dark'] .auth-header,html[data-theme='dark'] .auth-footer{background:#10192f;color:var(--ink);border-color:var(--line)}
html[data-theme='dark'] .subject-details p,html[data-theme='dark'] p,html[data-theme='dark'] .masthead small,html[data-theme='dark'] .mini-stat small,html[data-theme='dark'] .user-info small,html[data-theme='dark'] .bottom-note{color:var(--muted)}
html[data-theme='dark'] .content-card,html[data-theme='dark'] .subject-card{box-shadow:0 14px 36px rgba(3,6,19,.18)}
html[data-theme='dark'] .icon-button,html[data-theme='dark'] .theme-toggle{background:#131f39;color:#d9e2f8;border-color:#283452}
html[data-theme='dark'] .avatar{background:#211b43;color:#c8bfff}
html[data-theme='dark'] .hero{background:radial-gradient(circle at 75% 18%,rgba(102,99,232,.4),transparent 30%),radial-gradient(circle at 10% 85%,rgba(47,211,185,.24),transparent 25%),linear-gradient(145deg,#151f39,#0e1730 55%,#101d3d)}
html[data-theme='dark'] .tag{background:#1d2747;color:#d7cfff} html[data-theme='dark'] .tag.green{background:#163a34;color:#9ff1d9} html[data-theme='dark'] .tag.gray{background:#1a243c;color:#b2bed8}
html[data-theme='dark'] .planned-art{background:linear-gradient(135deg,#17223d,#10182b);color:#98a9d9}
html[data-theme='dark'] .filter.active{background:var(--purple);border-color:var(--purple)}
html[data-theme='light'] .hero{background:radial-gradient(circle at 75% 18%,rgba(122,98,255,.26),transparent 30%),radial-gradient(circle at 13% 80%,rgba(47,211,185,.25),transparent 22%),linear-gradient(135deg,#21305d,#263c7b)}
html[data-theme='light'] .theme-toggle{background:#fff9ff}
@media(max-width:700px){.theme-toggle{padding:8px 11px}.theme-toggle [data-theme-label]{display:none}.auth-header-actions small{display:none}}