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20px;padding:12px;background:#6e344a;color:#ffe2e3;border-radius:9px;font-size:11px}.quiz-layout{max-width:800px;margin:auto}.quiz-top{display:flex;align-items:center;justify-content:space-between;gap:15px;font-size:11px;color:#998eab;margin-bottom:18px}.question-dots{display:flex;gap:6px;flex-wrap:wrap}.question-dot{width:26px;height:26px;border-radius:8px;border:1px solid #e4dfec;background:white;color:#a49aad;font-size:10px;display:grid;place-items:center}.question-dot.filled{background:#ddd5ef;color:#756090;border-color:#ddd5ef}.question-dot.current{background:var(--purple);color:white;border-color:var(--purple)}.quiz-card{background:white;border:1px solid var(--line);border-radius:22px;padding:30px;box-shadow:var(--shadow)}.quiz-card h2{font-size:20px;line-height:1.6;margin-bottom:24px;letter-spacing:-.015em}.answers{display:grid;gap:10px}.option{display:flex;align-items:center;text-align:left;gap:13px;padding:13px 15px;border:1px solid #e8e3ee;background:white;border-radius:11px;color:#7a7088;font-size:12px;line-height:1.7;min-height:54px;width:100%}.option b{width:29px;height:29px;border-radius:8px;background:#f3f0f7;display:grid;place-items:center;color:#a392b9;font-size:11px;flex:none}.option.selected{border-color:#aa93d3;background:#f6f2fb;color:#69518d}.option.selected b{background:#9a7dcb;color:white}.option.correct{border-color:#92c9b2;background:#f0f9f4}.option.incorrect{border-color:#dda3a3;background:#fff4f3}.quiz-actions{display:flex;justify-content:space-between;gap:12px;margin-top:23px}.quiz-status{font-size:11px;color:#93879e;margin:15px 0 0;text-align:center}.quiz-feedback{padding:17px;background:#eeeaf7;color:#7b6691;border-radius:12px;margin-top:19px;font-size:12px;line-height:1.9}.quiz-feedback b{display:block;margin-bottom:5px}.result-card{text-align:center;padding:45px 30px;background:white;border:1px solid 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}

/* ===== V6 slide system ===== */
.subject-cover{aspect-ratio:16/9}
.slide-shell .content{max-width:1600px}.lesson-masthead small{color:#727892}
.lesson-sidebar .module-chip{display:flex;align-items:center;justify-content:space-between;border:1px solid #ffffff1b;border-radius:14px;padding:12px 14px;background:#ffffff08;margin:0 14px 16px;color:#d6daf0}.lesson-sidebar .module-chip b{font-size:18px}.lesson-sidebar .module-chip span{font-size:11px;color:#aeb5d2}
.toc-card{margin:0 14px 14px;background:linear-gradient(180deg,#222c4b,#1b2440);border:1px solid #ffffff14;border-radius:18px;padding:15px;display:flex;flex-direction:column;gap:14px}.toc-card .eyebrow{color:#b0a4e9;margin-bottom:10px}.toc-card h2{font-size:18px;margin-bottom:8px;color:#fff}.toc-card p{font-size:11px;color:#aab2cf;margin:0}.slide-nav{display:grid;gap:8px;max-height:calc(100dvh - 400px);overflow:auto;padding-right:4px}.slide-nav button{display:grid;grid-template-columns:44px 1fr;grid-template-rows:auto auto;gap:2px 10px;border:1px solid #ffffff10;background:#ffffff05;color:#d8dcf1;border-radius:14px;padding:10px 11px;text-align:left}.slide-nav button b{grid-row:1 / span 2;display:grid;place-items:center;width:44px;height:44px;border-radius:11px;background:#ffffff0e;color:#fff;font-size:12px}.slide-nav button span{font-size:12px;font-weight:650}.slide-nav button small{font-size:10px;color:#9ca6c9}.slide-nav button.current{background:#7462ca;border-color:#8876e0}.slide-nav button.current b{background:#ffffff1f}.slide-nav button.visited:not(.current){border-color:#3a476f}
.lesson-content{padding-top:22px}.slide-deck{display:grid;gap:14px}.slide-meta{display:flex;align-items:end;justify-content:space-between;gap:16px}.slide-meta h1{font-size:28px;margin-bottom:0}.slide-counter{font-size:30px;font-weight:750;letter-spacing:-.05em;color:#23253f}.slide-counter span{font-size:14px;color:var(--muted);font-weight:600}
.slide-frame{aspect-ratio:16/9;width:min(100%,1280px);background:linear-gradient(180deg,#fff,#fbfbff);border:1px solid var(--line);border-radius:28px;box-shadow:0 18px 45px rgba(35,37,63,.07);overflow:hidden}.slide-surface{height:100%;padding:clamp(18px,2vw,28px)}.slide-body{height:100%;overflow:auto;padding-right:4px}.slide-actions{display:flex;justify-content:space-between;gap:14px;width:min(100%,1280px)}
.slide-grid{display:grid;grid-template-columns:1.05fr .95fr;gap:18px;height:100%}.slide-grid.two-up{grid-template-columns:1.2fr .8fr}.slide-grid.lesson-slide{grid-template-columns:1.15fr .85fr}.slide-grid.example-slide{grid-template-columns:1.2fr .8fr}.slide-grid.reflection-slide{grid-template-columns:1fr 1fr}.panel{background:#fff;border:1px solid #eceaf4;border-radius:24px;padding:22px;min-height:100%}.full-panel{min-height:100%}.panel h2{font-size:28px;margin-bottom:12px}.panel h3{font-size:22px;margin-bottom:10px}.lead{font-size:18px;line-height:1.7;color:#5f6076}.lead.small{font-size:15px}
.visual-card{background:linear-gradient(180deg,#f8f7fe,#eef5ff);display:grid;place-items:center;overflow:hidden}.visual-card.secondary{background:linear-gradient(180deg,#f4f3fd,#eef8f4)}.visual-card img{width:100%;height:100%;object-fit:contain}
.pill-row{display:flex;gap:10px;flex-wrap:wrap;margin:18px 0}.cover-callout,.quote-card,.note-box{border-radius:18px;padding:18px 20px;background:#f6f4fc;border:1px solid #ebe6fa}.cover-callout p,.quote-card p,.note-box p{margin:8px 0 0}.quote-card.compact p{margin:0}
.objective-list,.mission-list{display:grid;gap:12px}.objective-card,.mission-card{display:grid;grid-template-columns:54px 1fr;gap:14px;align-items:start;padding:14px 16px;border-radius:18px;background:#fbfbfe;border:1px solid #eceaf4}.objective-card b,.mission-card b{display:grid;place-items:center;width:54px;height:54px;border-radius:16px;background:#eeebfa;color:#735ecf;font-size:14px}
.challenge-grid{grid-template-columns:.95fr 1.05fr}.tick-list{margin:18px 0 0;padding-left:20px;display:grid;gap:10px;color:#5b5d71}
.formula-box{font-size:30px;letter-spacing:-.03em;font-weight:700;color:#343756;padding:18px 20px;border-radius:20px;background:#f8f8fe;border:1px solid #eceaf4;margin:18px 0}.accent-panel{background:linear-gradient(180deg,#252f53,#1b2440);color:#fff;border-color:#293358}.accent-panel p,.accent-panel h3{color:#eef2ff}.concept-badge{width:72px;height:72px;border-radius:22px;background:#ffffff14;display:grid;place-items:center;font-size:24px;font-weight:750;margin-bottom:18px}.micro-steps{display:grid;gap:12px;margin-top:20px}.micro-steps div{display:flex;justify-content:space-between;gap:18px;padding:12px 14px;border-radius:14px;background:#ffffff0c}.micro-steps span{color:#cad2ed;font-size:13px}
.step-list{display:grid;gap:12px;margin-top:16px}.step-row{display:grid;grid-template-columns:42px 1fr;gap:14px;align-items:start;padding:14px;border-radius:18px;background:#fafaff;border:1px solid #eceaf4}.step-row b{display:grid;place-items:center;width:42px;height:42px;border-radius:14px;background:#eef3ff;color:#5066bc}.result-panel{background:linear-gradient(180deg,#f7fcfb,#effaf6)}.result-panel.huge{display:grid;place-content:center;text-align:center}.result-panel .lead strong{font-size:1.25em;color:#273757}
.panel-head{display:flex;align-items:center;justify-content:space-between;gap:14px;margin-bottom:12px}.lab-note-area{display:grid;gap:8px;margin-top:12px}.lab-note-area textarea,.panel textarea{width:100%;border:1px solid var(--line);border-radius:16px;background:#fbfbfe;padding:14px 15px;font:inherit;line-height:1.7;resize:vertical}.helper{font-size:12px;color:#74778f}
.quiz-panel{display:grid;gap:16px}.quiz-head{display:flex;align-items:center;justify-content:space-between;gap:12px;flex-wrap:wrap}.exam-question{font-size:21px;line-height:1.6;margin:4px 0}.quiz-inline-actions{display:flex;gap:10px;justify-content:space-between;align-items:center;flex-wrap:wrap}
.answers{display:grid;gap:10px}.option{display:flex;align-items:flex-start;gap:12px;width:100%;padding:14px 15px;border-radius:16px;border:1px solid #e7e5f1;background:#fff;text-align:left;color:var(--ink)}.option b{width:30px;height:30px;border-radius:10px;background:#eeebfa;display:grid;place-items:center;color:#6f5ad0;font-size:12px}.option.selected{border-color:#9e8fed;background:#f7f4ff}.option.correct{border-color:#9edac6;background:#f2fbf7}.option.incorrect{border-color:#f0c6bc;background:#fff7f5}.quiz-feedback{padding:14px 16px;border-radius:14px;background:#eef9f4;color:#23674c}.quiz-feedback.bad{background:#fff4e9;color:#74441c}.question-dots{display:flex;flex-wrap:wrap;gap:8px}.question-dot{width:32px;height:32px;border-radius:10px;border:1px solid #e6e2f2;background:#fff}.question-dot.filled{background:#f0edff;color:#6f5ad0}.question-dot.current{background:#7560d7;color:#fff;border-color:#7560d7}.hero-actions{display:flex;gap:10px;flex-wrap:wrap;margin-top:16px}.notice.bad{padding:12px 14px;border-radius:14px;background:#fff0ea;color:#7c4a29}
@media(max-width:1180px){.slide-nav{max-height:none}.slide-frame{width:100%}.slide-grid,.challenge-grid,.slide-grid.two-up,.slide-grid.lesson-slide,.slide-grid.example-slide,.slide-grid.reflection-slide{grid-template-columns:1fr}.panel h2{font-size:24px}.lead{font-size:16px}}
@media(max-width:700px){.toc-card{margin:10px 0 0}.slide-nav{display:flex;overflow:auto;padding-bottom:4px}.slide-nav button{min-width:170px}.slide-meta{align-items:flex-start;flex-direction:column}.slide-counter{font-size:22px}.slide-frame{aspect-ratio:auto;min-height:calc(100dvh - 235px)}.slide-surface{padding:16px}.panel{padding:18px;border-radius:20px}.panel h2{font-size:22px}.formula-box{font-size:24px}.objective-card,.mission-card,.step-row{grid-template-columns:40px 1fr}.objective-card b,.mission-card b,.step-row b{width:40px;height:40px;border-radius:12px}.slide-actions{width:100%;gap:10px}.slide-actions .btn{flex:1}}


/* ===== v6.1 desktop / TV no-scroll tuning ===== */
@media (min-width: 701px){
  html,body{height:100%;overflow:hidden}
  .shell.lesson-shell.slide-shell{height:100dvh;overflow:hidden}
  .lesson-shell .workspace{min-width:0;overflow:hidden}
  .lesson-content{height:calc(100dvh - 92px);overflow:hidden;padding-top:14px;padding-bottom:12px}
  .slide-deck{height:100%;grid-template-rows:auto 1fr auto}
  .slide-meta{padding-right:4px}
  .slide-meta h1{font-size:24px}
  .slide-counter{font-size:26px}
  .slide-frame{width:min(100%,1280px);height:calc(100dvh - 210px);max-height:720px;aspect-ratio:auto}
  .slide-surface{padding:18px 22px}
  .slide-body{overflow:hidden}
  .slide-actions{width:min(100%,1280px);padding-bottom:2px}
  .panel{padding:18px 18px}
  .panel h2{font-size:24px;margin-bottom:10px}
  .panel h3{font-size:20px;margin-bottom:8px}
  .lead{font-size:15px;line-height:1.55}
  .lead.small{font-size:14px;line-height:1.5}
  .pill-row{margin:14px 0}
  .cover-callout,.quote-card,.note-box{padding:14px 16px;border-radius:16px}
  .objective-list,.mission-list,.step-list,.micro-steps,.answers{gap:10px}
  .objective-card,.mission-card{padding:12px 14px;gap:12px}
  .objective-card b,.mission-card b{width:46px;height:46px;border-radius:14px}
  .step-row{padding:12px;gap:12px}
  .step-row b{width:36px;height:36px;border-radius:12px}
  .tick-list{margin-top:12px;gap:8px}
  .formula-box{font-size:24px;padding:14px 16px;margin:14px 0;border-radius:16px}
  .concept-badge{width:58px;height:58px;border-radius:18px;font-size:20px;margin-bottom:14px}
  .micro-steps div{padding:10px 12px;border-radius:12px}
  .lab-note-area{gap:6px;margin-top:8px}
  .lab-note-area textarea,.panel textarea{padding:12px 14px;line-height:1.55}
  .helper{font-size:11px;line-height:1.45}
  .exam-question{font-size:18px;line-height:1.45}
  .option{padding:12px 14px;gap:10px;border-radius:14px}
  .option b{width:28px;height:28px;border-radius:9px}
  .question-dot{width:30px;height:30px}
  .hero-actions{margin-top:12px;gap:8px}
  .slide-nav{max-height:calc(100dvh - 360px)}
}