:root{
  --bg:#f4f7fb;--card:#ffffff;--ink:#10233e;--muted:#5d6f84;--line:#dbe5ef;
  --brand:#1957a6;--brand2:#0e7b78;--soft:#eaf2ff;--soft2:#e9f7f5;--warn:#8b5a00;--warnbg:#fff5db;
  --good:#146c43;--goodbg:#e9f7ef;--bad:#9b2c2c;--badbg:#fff0f0;--shadow:0 18px 50px rgba(30,55,90,.12);
}
*{box-sizing:border-box} html{scroll-behavior:smooth} body{margin:0;background:linear-gradient(180deg,#f7faff 0,#f3f6fa 100%);color:var(--ink);font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",Arial,sans-serif;line-height:1.62}
button,input{font:inherit} button{cursor:pointer} .hidden{display:none!important}.app-shell{min-height:100vh;display:flex;flex-direction:column}.topbar{position:sticky;top:0;z-index:20;display:flex;gap:20px;justify-content:space-between;align-items:center;padding:14px clamp(18px,4vw,56px);background:rgba(255,255,255,.93);backdrop-filter:blur(14px);border-bottom:1px solid var(--line)}
.brand-wrap{display:flex;align-items:center;gap:12px;min-width:0}.brand-mark{width:42px;height:42px;border-radius:13px;display:grid;place-items:center;color:#fff;font-weight:800;letter-spacing:.03em;background:linear-gradient(135deg,var(--brand),var(--brand2));box-shadow:0 7px 18px rgba(25,87,166,.2)}.course-code{font-size:13px;font-weight:700;color:var(--brand);letter-spacing:.025em}.course-unit{font-size:15px;font-weight:750;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.top-actions{display:flex;gap:8px;align-items:center}.chip-btn{border:1px solid #c8d8e8;background:#fff;color:var(--brand);border-radius:999px;padding:8px 12px;font-size:13px;font-weight:700}.chip-btn.subtle{color:var(--muted)}.chip-btn:disabled{opacity:.45;cursor:not-allowed}
.progress-wrap{position:sticky;top:71px;z-index:18;display:flex;align-items:center;gap:10px;padding:7px clamp(18px,4vw,56px);background:#fff;border-bottom:1px solid var(--line)}.progress-track{height:7px;flex:1;background:#e7edf4;border-radius:999px;overflow:hidden}.progress-bar{height:100%;width:0;background:linear-gradient(90deg,var(--brand),var(--brand2));transition:width .3s ease}.progress-text{font-size:12px;font-weight:800;color:var(--muted);min-width:38px;text-align:right}
.main{width:min(1240px,100%);margin:0 auto;flex:1;padding:clamp(22px,4vw,54px) clamp(16px,3vw,30px) 50px}.screen{display:none}.screen.active{display:block}.hero-card{padding:clamp(28px,5vw,58px);border-radius:30px;color:#fff;background:radial-gradient(circle at 90% 10%,rgba(255,255,255,.24),transparent 25%),linear-gradient(135deg,#153f80,#167c82);box-shadow:var(--shadow);overflow:hidden}.eyebrow{text-transform:uppercase;letter-spacing:.13em;font-weight:800;font-size:12px;opacity:.8}.hero-card h1{font-size:clamp(34px,5vw,64px);line-height:1.04;margin:10px 0 18px;max-width:900px}.hero-lead{font-size:clamp(16px,2vw,20px);max-width:850px;opacity:.95}.feature-row{display:grid;grid-template-columns:repeat(4,1fr);gap:12px;margin-top:30px;max-width:760px}.feature{padding:14px 16px;border-radius:18px;background:rgba(255,255,255,.12);border:1px solid rgba(255,255,255,.2)}.feature span{display:block;font-size:24px;font-weight:850}.feature small{opacity:.85}
.login-grid{display:grid;grid-template-columns:1.35fr .8fr;gap:20px;margin-top:22px}.panel{background:var(--card);border:1px solid var(--line);border-radius:24px;padding:26px;box-shadow:0 10px 30px rgba(30,55,90,.06)}.panel h2{margin:5px 0 8px;font-size:26px}.panel-kicker{font-size:12px;text-transform:uppercase;letter-spacing:.12em;color:var(--brand2);font-weight:850}.muted{color:var(--muted)}.tiny{font-size:12px}.field-label{display:block;font-size:13px;font-weight:800;margin:20px 0 8px}.id-row{display:flex;gap:10px}.text-input{width:100%;border:1px solid #b9cadb;border-radius:14px;padding:13px 14px;outline:none;background:#fff;text-transform:uppercase;font-weight:750;letter-spacing:.05em}.text-input:focus{border-color:var(--brand);box-shadow:0 0 0 4px rgba(25,87,166,.1)}.btn{border:0;border-radius:14px;padding:11px 16px;font-weight:800;transition:transform .08s ease,box-shadow .2s ease,background .2s}.btn:active{transform:translateY(1px)}.btn.primary{background:linear-gradient(135deg,var(--brand),#2168bb);color:#fff;box-shadow:0 8px 20px rgba(25,87,166,.18)}.btn.secondary{background:var(--soft2);color:#0e6765;border:1px solid #b7e2dd}.btn.ghost{background:#fff;color:var(--ink);border:1px solid #cfdae6}.btn.large{padding:14px 20px;font-size:16px}.btn.full{width:100%}.identity-card{margin-top:14px;padding:15px 16px;background:var(--soft2);border:1px solid #b7e2dd;border-radius:16px}.identity-card b{display:block}.error-box{margin-top:12px;padding:12px 14px;background:var(--badbg);border:1px solid #efc4c4;color:var(--bad);border-radius:13px}.privacy-note{margin-top:16px}.demo-note{margin-top:14px;padding:12px;background:#f7f9fc;border-radius:13px;color:var(--muted);font-size:13px}
.layout{display:grid;grid-template-columns:260px minmax(0,1fr);gap:24px}.side-nav{position:sticky;top:112px;align-self:start;background:#fff;border:1px solid var(--line);border-radius:20px;padding:10px;box-shadow:0 8px 25px rgba(20,50,85,.05)}.side-nav button{width:100%;text-align:left;background:transparent;border:0;border-radius:13px;padding:11px 12px;color:var(--muted);font-weight:700;line-height:1.3}.side-nav button.active{background:var(--soft);color:var(--brand)}.side-nav button.done:after{content:"✓";float:right;color:var(--good)}.content-column{min-width:0}.lesson-card{background:#fff;border:1px solid var(--line);border-radius:26px;padding:clamp(22px,4vw,40px);box-shadow:0 10px 35px rgba(30,55,90,.06)}.lesson-card h1{font-size:clamp(30px,4vw,46px);line-height:1.12;margin:8px 0 14px}.lesson-card h2{font-size:23px;line-height:1.2;margin:28px 0 10px}.lesson-card h3{font-size:18px;margin:22px 0 8px}.lesson-card p{max-width:88ch}.lesson-lead{font-size:18px;color:#344c68}.source-line{font-size:12px;color:var(--muted);margin-top:9px}.source-line span{display:inline-block;padding:4px 8px;border-radius:999px;background:#f2f5f9;margin:2px 4px 2px 0}.callout{border-left:4px solid var(--brand);background:#f5f9ff;border-radius:0 14px 14px 0;padding:14px 16px;margin:18px 0}.callout.teal{border-color:var(--brand2);background:#f2fbfa}.callout.warn{border-color:#d58c13;background:#fff9ec}.compare-grid,.theory-grid,.trajectory-grid,.case-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px;margin:18px 0}.mini-card{border:1px solid var(--line);border-radius:17px;padding:16px;background:#fff}.mini-card h3{margin:0 0 7px}.tag{display:inline-block;border-radius:999px;padding:4px 8px;background:var(--soft);color:var(--brand);font-size:11px;font-weight:850;margin:2px 4px 2px 0}.teacher-prompt{display:none;margin:18px 0;padding:16px;border:1px dashed #6fa2d7;background:#f6fbff;border-radius:16px}.class-mode .teacher-prompt{display:block}.self-hint{display:block}.class-mode .self-hint{display:none}.reveal-box{margin:12px 0}.reveal-content{padding:12px 14px;background:#f7f9fc;border-radius:12px;margin-top:8px}.quick-check{margin:24px 0 5px;padding:18px;border:1px solid #cbd9e7;border-radius:18px;background:#fbfdff}.quick-check .qc-title{font-weight:850;margin-bottom:10px}.choice-btn{display:block;width:100%;text-align:left;border:1px solid #cfdae6;background:#fff;border-radius:13px;padding:11px 12px;margin:8px 0}.choice-btn:hover{border-color:#8db0d5}.choice-btn.correct{background:var(--goodbg);border-color:#9bd1b3;color:var(--good)}.choice-btn.incorrect{background:var(--badbg);border-color:#e2a6a6;color:var(--bad)}.qc-feedback{margin-top:10px;font-size:14px;font-weight:650}.lesson-actions{display:flex;gap:10px;margin-top:18px;align-items:center}.spacer{flex:1}
.theory-tabs{display:flex;gap:8px;flex-wrap:wrap;margin:14px 0}.theory-tab{border:1px solid #cbd8e5;background:#fff;border-radius:999px;padding:8px 12px;font-weight:800;color:var(--muted)}.theory-tab.active{background:var(--soft);color:var(--brand);border-color:#a8c6e6}.theory-detail{padding:18px;border:1px solid var(--line);border-radius:18px;background:#fbfdff}.theory-detail .cols{display:grid;grid-template-columns:1fr 1fr 1fr;gap:12px}.theory-detail .cols > div{padding:12px;border-radius:12px;background:#fff;border:1px solid #e1e9f1}.theory-detail b{display:block;margin-bottom:5px}.timeline{display:grid;gap:10px}.timeline-item{display:grid;grid-template-columns:130px 1fr;gap:12px;padding:14px;border:1px solid var(--line);border-radius:15px;background:#fff}.timeline-item .year{font-weight:900;color:var(--brand)}
.quiz-shell{max-width:900px;margin:0 auto}.quiz-head{display:flex;gap:20px;justify-content:space-between;align-items:flex-start;margin-bottom:18px}.quiz-head h2{font-size:34px;margin:4px 0 8px}.quiz-status{white-space:nowrap;background:var(--soft);color:var(--brand);padding:9px 12px;border-radius:999px;font-weight:850}.question-card{background:#fff;border:1px solid var(--line);border-radius:24px;padding:clamp(22px,4vw,38px);box-shadow:var(--shadow)}.q-topic{font-size:11px;text-transform:uppercase;letter-spacing:.12em;color:var(--brand2);font-weight:850}.q-text{font-size:22px;font-weight:780;line-height:1.35;margin:8px 0 18px}.q-option{display:flex;gap:12px;align-items:flex-start;padding:13px 14px;border:1px solid #cfdae6;border-radius:14px;margin:9px 0;background:#fff}.q-option:hover{border-color:#8db0d5}.q-option input{margin-top:5px;accent-color:var(--brand)}.q-letter{display:grid;place-items:center;flex:0 0 28px;height:28px;border-radius:8px;background:#f0f4f8;font-weight:900;color:var(--muted)}.quiz-nav{display:flex;gap:10px;margin-top:16px}.quiz-nav .btn:last-child{margin-left:auto}.overview-panel{margin-top:15px;background:#fff;border:1px solid var(--line);border-radius:18px;padding:16px}.overview-grid{display:grid;grid-template-columns:repeat(6,1fr);gap:8px}.overview-grid button{border:1px solid #d2dde8;background:#fff;border-radius:10px;padding:9px;font-weight:850}.overview-grid button.answered{background:var(--soft2);border-color:#a9dbd6;color:#0e6765}.notice{padding:14px 16px;background:#f7f9fc;border:1px solid var(--line);border-radius:14px}.notice.compact{padding:10px 12px;margin-bottom:10px;background:var(--warnbg);color:var(--warn);border-color:#ecd59c}.submit-card{max-width:720px;margin:40px auto;background:#fff;border:1px solid var(--line);border-radius:26px;padding:clamp(26px,5vw,48px);box-shadow:var(--shadow);text-align:center}.submit-card h2{font-size:34px;margin:8px 0}.identity-line{font-weight:800}.submit-card .btn.large{width:100%;margin-top:12px}.submit-state{min-height:42px;margin-top:14px;font-weight:700}.submit-state.pending{color:var(--warn)}.submit-state.error{color:var(--bad)}.submit-state.ok{color:var(--good)}
.result-grid{display:grid;grid-template-columns:.8fr 1.4fr;gap:22px}.result-score-card,.result-feedback-card{background:#fff;border:1px solid var(--line);border-radius:26px;padding:28px;box-shadow:var(--shadow)}.result-score-card{text-align:center}.saved-badge{display:inline-block;background:var(--goodbg);color:var(--good);border:1px solid #a8d7bc;border-radius:999px;padding:7px 10px;font-size:12px;font-weight:850}.result-student{margin:18px 0 8px;font-weight:800}.score-ring{width:190px;height:190px;margin:18px auto;display:grid;place-items:center;align-content:center;border-radius:50%;background:radial-gradient(circle,#fff 58%,transparent 59%),conic-gradient(var(--brand) var(--score-angle,0deg),#e5edf4 0);box-shadow:inset 0 0 0 1px #d8e3ed}.score-main{font-size:38px;font-weight:900;line-height:1}.score-pct{font-weight:800;color:var(--muted);margin-top:8px}.result-feedback-card h2{font-size:30px;margin:4px 0 18px}.feedback-block{padding:14px 16px;border-radius:15px;background:#f7f9fc;margin:10px 0}.feedback-block p{margin:4px 0 0}.feedback-block.good{background:var(--goodbg)}.feedback-block.improve{background:#fff8e9}.feedback-block.next{background:var(--soft)}.topic-bars{margin:20px 0}.topic-row{display:grid;grid-template-columns:155px 1fr 55px;gap:10px;align-items:center;margin:9px 0}.topic-label{font-size:13px;font-weight:750}.bar{height:10px;border-radius:999px;background:#e6edf4;overflow:hidden}.bar>span{display:block;height:100%;background:linear-gradient(90deg,var(--brand),var(--brand2));border-radius:999px}.topic-pct{text-align:right;font-size:12px;font-weight:850;color:var(--muted)}
.footer{display:flex;justify-content:space-between;gap:12px;padding:18px clamp(18px,4vw,56px);color:#708196;border-top:1px solid var(--line);font-size:12px;background:#fff}
@media(max-width:900px){.login-grid,.result-grid,.layout{grid-template-columns:1fr}.side-nav{position:relative;top:auto;display:flex;overflow:auto;white-space:nowrap}.side-nav button{width:auto}.feature-row{grid-template-columns:repeat(2,1fr)}.theory-detail .cols{grid-template-columns:1fr}.top-actions{display:none}.progress-wrap{top:70px}.compare-grid,.theory-grid,.trajectory-grid,.case-grid{grid-template-columns:1fr}.timeline-item{grid-template-columns:1fr}.footer{flex-direction:column}.quiz-head{flex-direction:column}.quiz-status{align-self:flex-start}}
@media(max-width:520px){.main{padding-left:12px;padding-right:12px}.topbar{padding:12px 14px}.course-unit{max-width:240px}.hero-card{border-radius:22px}.feature-row{gap:8px}.panel,.lesson-card,.question-card,.result-score-card,.result-feedback-card{border-radius:20px;padding:19px}.id-row{flex-direction:column}.lesson-actions{flex-wrap:wrap}.lesson-actions .spacer{display:none}.lesson-actions .btn{flex:1 1 42%}.overview-grid{grid-template-columns:repeat(4,1fr)}.topic-row{grid-template-columns:105px 1fr 45px}.q-text{font-size:19px}}
@media print{.topbar,.progress-wrap,.side-nav,.lesson-actions,.footer,.btn{display:none!important}.main{padding:0}.lesson-card{box-shadow:none;border:0}.screen{display:none!important}.screen.active{display:block!important}}

/* landscape presentation refinement */
.top-actions{flex-wrap:wrap;justify-content:flex-end}
.main{width:min(1360px,100%)}
.compact-grid-2{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}
.compact-grid-3{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px}
.slide-grid{display:grid;grid-template-columns:1.15fr .92fr;gap:14px;align-items:start;margin-top:10px}
.slide-col{display:grid;gap:12px;align-content:start;min-width:0}
.bullets{margin:0;padding-left:18px}
.bullets li{margin:0 0 4px}
.dense-cards .mini-card h3{font-size:16px}
.dense-cards .mini-card p{font-size:14px;line-height:1.45}
.split-lower{margin-top:12px}
.compact-timeline{grid-template-columns:repeat(2,minmax(0,1fr));gap:10px}
.compact-timeline .timeline-item{padding:12px}

body.presentation-on .topbar{padding:10px 18px}
body.presentation-on .brand-mark{width:36px;height:36px;border-radius:11px}
body.presentation-on .course-code{font-size:12px}
body.presentation-on .course-unit{font-size:14px}
body.presentation-on .chip-btn{padding:7px 11px;font-size:12px}
body.presentation-on .progress-wrap{top:61px}
body.presentation-on .main{width:min(1500px,100%);padding:14px 18px 18px}
body.presentation-on .layout{grid-template-columns:240px minmax(0,1fr);gap:16px;align-items:start}
body.presentation-on .side-nav{top:92px;padding:8px;border-radius:18px}
body.presentation-on .side-nav button{padding:9px 10px;font-size:13px}
body.presentation-on .lesson-card{height:calc(100vh - 170px);padding:18px 20px;border-radius:22px;display:grid;align-content:start;gap:8px;overflow:hidden}
body.presentation-on .lesson-card h1{font-size:38px;line-height:1.08;margin:2px 0 4px}
body.presentation-on .lesson-card h2{font-size:18px;line-height:1.18;margin:0}
body.presentation-on .lesson-card h3{font-size:15px;line-height:1.2;margin:0 0 4px}
body.presentation-on .lesson-card p{max-width:none;margin:0;font-size:13px;line-height:1.42}
body.presentation-on .lesson-lead{font-size:15px;color:#28435f}
body.presentation-on .source-line{font-size:11px;margin-top:0}
body.presentation-on .source-line span{padding:3px 7px}
body.presentation-on .callout{padding:10px 12px;margin:0;border-left-width:4px;border-radius:0 12px 12px 0;font-size:13px;line-height:1.42}
body.presentation-on .compare-grid,
body.presentation-on .theory-grid,
body.presentation-on .trajectory-grid,
body.presentation-on .case-grid,
body.presentation-on .compact-grid-2,
body.presentation-on .compact-grid-3{gap:10px;margin:0}
body.presentation-on .mini-card{padding:10px 12px;border-radius:14px}
body.presentation-on .bullets{font-size:13px;line-height:1.35}
body.presentation-on .bullets li{margin-bottom:3px}
body.presentation-on .quick-check{margin:0;padding:12px 12px 10px;border-radius:16px}
body.presentation-on .quick-check .qc-title{font-size:14px;margin-bottom:8px}
body.presentation-on .choice-btn{padding:8px 10px;margin:6px 0;border-radius:11px;font-size:13px;line-height:1.35}
body.presentation-on .qc-feedback{margin-top:8px;font-size:12px}
body.presentation-on .lesson-actions{margin-top:10px}
body.presentation-on .theory-tabs{gap:6px;margin:0}
body.presentation-on .theory-tab{padding:7px 10px;font-size:12px}
body.presentation-on .theory-detail{padding:10px 12px;border-radius:16px}
body.presentation-on .theory-detail .cols{gap:8px}
body.presentation-on .theory-detail .cols > div{padding:10px}
body.presentation-on .timeline{gap:8px}
body.presentation-on .timeline-item{grid-template-columns:74px 1fr;gap:10px;padding:10px;border-radius:13px}
body.presentation-on .timeline-item .year{font-size:13px}
body.presentation-on .teacher-prompt{margin:0;padding:10px 12px;border-radius:14px}
body.presentation-on .btn.large{padding-top:12px;padding-bottom:12px}
body.presentation-on #screen-learn{overflow:hidden}
body.presentation-on #screen-learn .content-column{display:flex;flex-direction:column;min-width:0}
body.presentation-on #lessonMount{min-width:0}

@media(max-width:1180px){
  .compact-grid-3{grid-template-columns:repeat(2,minmax(0,1fr))}
  .slide-grid{grid-template-columns:1fr}
}

/* v1.2.0 — 3-hour landscape teaching mode */
.slide-meta{display:inline-flex;align-items:center;padding:7px 10px;border-radius:999px;background:#f2f6fb;color:var(--muted);font-size:12px;font-weight:800;white-space:nowrap}
.side-nav-head{display:flex;align-items:center;justify-content:space-between;padding:8px 10px 10px;border-bottom:1px solid var(--line);margin-bottom:6px}
.side-nav-head button{width:34px!important;height:34px;padding:0!important;text-align:center!important;font-size:22px!important;color:var(--muted)!important}
#sideNavItems{display:grid;gap:2px}
#sideNavItems button{display:flex;align-items:center;justify-content:space-between;gap:10px}
#sideNavItems button span{min-width:0}
#sideNavItems button small{flex:0 0 auto;font-size:10px;opacity:.7;font-weight:800}
.nav-scrim{display:none;position:fixed;inset:0;z-index:38;border:0;background:rgba(17,34,55,.28);backdrop-filter:blur(1px)}
body.nav-open .nav-scrim{display:block}
.layout{display:block}
.side-nav{position:fixed;z-index:40;left:16px;top:88px;bottom:18px;width:min(330px,calc(100vw - 32px));overflow:auto;transform:translateX(calc(-100% - 28px));transition:transform .2s ease;box-shadow:0 22px 60px rgba(20,50,85,.22)}
body.nav-open .side-nav{transform:translateX(0)}
.content-column{width:100%;max-width:1500px;margin:0 auto}
.big-bullets{margin:0;padding-left:22px;font-size:15px;line-height:1.45}
.big-bullets li{margin:0 0 8px}
.process-arrow{display:grid;grid-template-columns:1fr auto 1fr auto 1fr;gap:10px;align-items:stretch}
.process-arrow>div{display:grid;place-items:center;text-align:center}
.process-arrow>div:not(:nth-child(even)){border:1px solid var(--line);border-radius:15px;padding:14px;background:#fbfdff}
.process-arrow b{display:block;font-size:16px;color:var(--brand)}
.process-arrow span{display:block;font-size:13px;color:var(--muted);line-height:1.35;margin-top:5px}
.theory-map{display:grid;gap:7px}
.theory-map-row{display:grid;grid-template-columns:155px 1fr 1.35fr 1.3fr;gap:10px;align-items:center;padding:10px 12px;border:1px solid var(--line);border-radius:13px;background:#fff;font-size:13px;line-height:1.3}
.theory-map-row b{color:var(--brand)}
.theory-map-row em{color:var(--muted);font-style:normal}
.factor-large .mini-card b{display:block;margin-top:7px;color:var(--brand2)}
.decision-cycle{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px}
.decision-cycle>div{padding:12px 14px;border:1px solid var(--line);border-radius:14px;background:#fff}
.decision-cycle b{display:block;color:var(--brand);margin-bottom:4px}
.decision-cycle span{font-size:13px;line-height:1.35;color:#344c68}
.case-strong h3{font-size:17px!important}.case-strong p{margin-bottom:8px!important}
.tech-dense .mini-card,.future-grid .mini-card{min-height:0}

body.presentation-on{overflow:hidden}
body.presentation-on .footer{display:none}
body.presentation-on .topbar{position:fixed;left:0;right:0;top:0;height:58px;padding:8px 14px;z-index:45}
body.presentation-on .brand-wrap{max-width:43vw}
body.presentation-on .brand-mark{width:34px;height:34px}
body.presentation-on .course-code{font-size:11px}
body.presentation-on .course-unit{font-size:13px}
body.presentation-on .top-actions{gap:6px;flex-wrap:nowrap}
body.presentation-on .chip-btn{padding:6px 9px;font-size:11px;white-space:nowrap}
body.presentation-on #audioStop:disabled{display:none}
body.presentation-on .progress-wrap{position:fixed;left:0;right:0;top:58px;height:23px;padding:5px 16px;z-index:44}
body.presentation-on .progress-track{height:5px}
body.presentation-on .main{width:100%;max-width:none;padding:93px 18px 10px;height:100vh;overflow:hidden}
body.presentation-on #screen-learn{height:100%;overflow:hidden}
body.presentation-on .content-column{height:100%;display:grid;grid-template-rows:minmax(0,1fr) auto;gap:7px}
body.presentation-on #lessonMount{min-height:0;height:100%}
body.presentation-on .lesson-card{height:100%;min-height:0;padding:15px 18px 13px;border-radius:20px;display:block;overflow:hidden}
body.presentation-on .lesson-card h1{font-size:31px;line-height:1.04;margin:2px 0 7px}
body.presentation-on .lesson-card h2{font-size:18px;line-height:1.15;margin:6px 0}
body.presentation-on .lesson-card h3{font-size:15px;line-height:1.18;margin:0 0 4px}
body.presentation-on .lesson-card p{max-width:none;margin:0 0 5px;font-size:14px;line-height:1.38}
body.presentation-on .lesson-lead{font-size:15px;line-height:1.4;margin-bottom:8px}
body.presentation-on .eyebrow{font-size:10px}
body.presentation-on .slide-grid{grid-template-columns:1.08fr .92fr;gap:12px;margin-top:6px}
body.presentation-on .slide-col{gap:8px}
body.presentation-on .compact-grid-2{gap:8px}
body.presentation-on .compact-grid-3{gap:8px}
body.presentation-on .mini-card{padding:9px 11px;border-radius:12px}
body.presentation-on .mini-card p{font-size:13px;line-height:1.32;margin:0}
body.presentation-on .big-bullets{font-size:13.5px;line-height:1.38;padding-left:20px}
body.presentation-on .big-bullets li{margin-bottom:5px}
body.presentation-on .bullets{font-size:12.5px;line-height:1.32}
body.presentation-on .callout{padding:8px 10px;font-size:12.7px;line-height:1.35}
body.presentation-on .teacher-prompt{padding:8px 10px;font-size:12.5px;line-height:1.32}
body.presentation-on .quick-check{padding:9px 10px 8px}
body.presentation-on .quick-check .qc-title{font-size:13px;margin-bottom:5px}
body.presentation-on .choice-btn{padding:6px 8px;margin:4px 0;font-size:12.2px;line-height:1.25}
body.presentation-on .qc-feedback{font-size:11.5px;line-height:1.3;margin-top:5px}
body.presentation-on .source-line{font-size:10px;margin-top:4px}
body.presentation-on .source-line span{padding:2px 6px}
body.presentation-on .timeline{gap:6px}
body.presentation-on .timeline-item{grid-template-columns:72px 1fr;gap:8px;padding:8px 10px;font-size:12.5px;line-height:1.25}
body.presentation-on .decision-cycle{gap:7px}
body.presentation-on .decision-cycle>div{padding:9px 10px}
body.presentation-on .decision-cycle span{font-size:12.5px}
body.presentation-on .process-arrow{gap:7px}
body.presentation-on .process-arrow>div:not(:nth-child(even)){padding:10px}
body.presentation-on .process-arrow span{font-size:12.5px}
body.presentation-on .theory-map{gap:5px}
body.presentation-on .theory-map-row{grid-template-columns:130px .9fr 1.2fr 1.2fr;gap:7px;padding:7px 9px;font-size:11.8px;line-height:1.22}
body.presentation-on .lesson-actions{margin:0;min-height:41px}
body.presentation-on .lesson-actions .btn{padding:8px 12px;font-size:12px;border-radius:11px}
body.presentation-on .side-nav{top:70px;bottom:10px;left:10px}
body.presentation-on .side-nav button{font-size:12px;padding:7px 9px}
body.presentation-on .side-nav-head{position:sticky;top:0;background:#fff;z-index:2}

/* Automatic emergency fit. Used only when a teaching screen would otherwise overflow. */
body.presentation-on .lesson-card.fit-tight{padding:12px 15px 10px}
body.presentation-on .lesson-card.fit-tight h1{font-size:28px;margin-bottom:5px}
body.presentation-on .lesson-card.fit-tight p{font-size:12.7px;line-height:1.3}
body.presentation-on .lesson-card.fit-tight .lesson-lead{font-size:13.7px}
body.presentation-on .lesson-card.fit-tight .mini-card{padding:7px 9px}
body.presentation-on .lesson-card.fit-tight .mini-card p{font-size:12px}
body.presentation-on .lesson-card.fit-tight .choice-btn{font-size:11.5px;padding:5px 7px}
body.presentation-on .lesson-card.fit-tight .callout,body.presentation-on .lesson-card.fit-tight .teacher-prompt{font-size:11.8px;padding:7px 8px}
body.presentation-on .lesson-card.fit-tighter h1{font-size:26px}
body.presentation-on .lesson-card.fit-tighter p{font-size:11.8px}
body.presentation-on .lesson-card.fit-tighter .mini-card p{font-size:11.2px}
body.presentation-on .lesson-card.fit-tighter .theory-map-row{font-size:10.8px;padding:5px 7px}

@media(max-width:1100px){
  body.presentation-on{overflow:auto}
  body.presentation-on .topbar,body.presentation-on .progress-wrap{position:sticky}
  body.presentation-on .main{height:auto;overflow:visible;padding-top:14px}
  body.presentation-on #screen-learn,body.presentation-on .content-column,body.presentation-on #lessonMount{height:auto;overflow:visible}
  body.presentation-on .lesson-card{height:auto;overflow:visible}
  body.presentation-on .slide-grid{grid-template-columns:1fr}
  body.presentation-on .compact-grid-3{grid-template-columns:repeat(2,minmax(0,1fr))}
  body.presentation-on .top-actions{display:none}
  .process-arrow{grid-template-columns:1fr}
  .process-arrow>div:nth-child(even){display:none}
  .theory-map-row{grid-template-columns:1fr}
}