:root{font-family:Inter,ui-sans-serif,system-ui,-apple-system,"Segoe UI",sans-serif;color:#18244b;background:#f5f7fd;font-size:16px}*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0}button,input{font:inherit}button{cursor:pointer}button:focus-visible,input:focus-visible{outline:3px solid #ff9b69;outline-offset:2px}.sr-only{position:absolute;width:1px;height:1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap}.app{min-height:100vh;display:grid;grid-template-columns:292px minmax(0,1fr)}.sidebar{height:100vh;position:sticky;top:0;background:#162661;color:#fff;padding:26px 16px 20px;display:flex;flex-direction:column;gap:20px}.brand{display:flex;align-items:center;gap:12px;padding:0 10px;font-weight:900;font-size:1.45rem;letter-spacing:-.055em}.brand-mark{display:grid;place-items:center;width:40px;height:40px;border-radius:12px;background:#c9f36b;color:#162661;font-weight:950;transform:rotate(-5deg)}.sidebar-heading{padding:0 10px;display:flex;justify-content:space-between;align-items:baseline;gap:8px;color:#d6defb;font-size:.85rem;font-weight:750}.sidebar-heading strong{color:#baf06b;font-size:.75rem;white-space:nowrap}.search-wrap{position:relative;margin:0 8px}.search-wrap span:not(.sr-only){position:absolute;left:13px;top:7px;color:#aebae1;font-size:1.55rem}.search-wrap input{width:100%;border:1px solid #50639b;background:#213674;color:#fff;border-radius:11px;padding:12px 12px 12px 37px;font-size:.9rem}.search-wrap input::placeholder{color:#c2cae2}.lesson-list{overflow:auto;min-height:0;padding:0 4px 8px;scrollbar-color:#5d6ba4 transparent}.unit-label{padding:14px 10px 7px;color:#98a9dc;text-transform:uppercase;letter-spacing:.1em;font-size:.7rem;font-weight:900}.lesson-link{width:100%;display:flex;align-items:center;gap:10px;text-align:left;border:0;background:transparent;color:#eef1ff;border-radius:11px;padding:9px 10px;min-height:45px;font-size:.89rem;font-weight:680}.lesson-link:hover{background:#2a3d77}.lesson-link.active{background:#c9f36b;color:#14214a;font-weight:900}.lesson-link .n{font-size:.76rem;opacity:.7;font-variant-numeric:tabular-nums}.lesson-link .done{margin-left:auto;color:#baf06b}.lesson-link.active .done{color:#1d5a00}.sidebar-note{border-top:1px solid #4c5d91;color:#b8c3e8;margin:0 9px;padding-top:16px;line-height:1.5;font-size:.77rem}.main{min-width:0;padding:25px clamp(18px,3.3vw,55px) 28px}.topbar{display:flex;align-items:center;justify-content:space-between;gap:12px;max-width:1260px;margin:auto}.eyebrow,.card-kicker{font-size:.78rem;text-transform:uppercase;letter-spacing:.12em;font-weight:900;color:#5064b1}.top-actions{display:flex;align-items:center;gap:12px}.timer{display:flex;align-items:center;gap:7px;padding:6px 7px 6px 12px;border:1px solid #dce3f3;border-radius:12px;background:#fff;box-shadow:0 3px 13px #14245c09}.timer span{font-variant-numeric:tabular-nums;font-weight:900;color:#182957}.timer button{border:0;border-radius:7px;background:#edf1fc;color:#263c83;padding:6px 9px;font-size:.8rem;font-weight:850}.projector,.mobile-menu{border:1px solid #cbd5ef;background:#fff;color:#1c2c63;border-radius:11px;padding:10px 13px;font-weight:850;font-size:.82rem}.mobile-menu{display:none}.lesson-head{max-width:1260px;margin:34px auto 27px;padding:0 2px}.lesson-head h1{font-size:clamp(2.6rem,5.2vw,5rem);line-height:1.02;letter-spacing:-.073em;margin:9px 0 14px;color:#17255a}.lesson-head p{font-size:1.12rem;color:#586582;line-height:1.5;margin:0;max-width:770px}.badges{display:flex;flex-wrap:wrap;gap:8px;margin-top:19px}.badge{border:1px solid #d2dcef;background:#fff;border-radius:30px;padding:7px 12px;color:#465682;font-size:.79rem;font-weight:850}.work-area{max-width:1260px;margin:auto;display:grid;grid-template-columns:minmax(0,1.5fr) minmax(280px,.65fr);gap:18px;align-items:start}.main-column{min-width:0}.stage-tabs{display:flex;gap:5px;overflow-x:auto;margin-bottom:10px;padding-bottom:3px}.stage-tab{border:0;background:transparent;color:#667394;border-radius:10px;padding:11px 13px;font-size:.86rem;font-weight:850;white-space:nowrap}.stage-tab:hover{background:#e9edfa}.stage-tab.active{background:#172661;color:white}.lesson-card,.teacher-card{background:#fff;border:1px solid #dee5f3;border-radius:20px;box-shadow:0 12px 35px #1726610b}.lesson-card{padding:clamp(22px,3vw,38px);min-height:395px}.teacher-card{padding:26px;margin-top:54px}.teacher-card h2{letter-spacing:-.04em;font-size:1.4rem;margin:7px 0 18px}.teacher-card h3{font-size:.88rem;text-transform:uppercase;letter-spacing:.07em;color:#5064b1;margin:22px 0 7px}.teacher-card p,.teacher-card li{line-height:1.55;color:#4f5d7c;font-size:.89rem}.teacher-card ul{padding-left:18px;margin:8px 0}.stage-title{font-size:clamp(1.6rem,2.7vw,2.1rem);line-height:1.13;letter-spacing:-.05em;margin:6px 0 15px}.stage-intro{font-size:1.04rem;line-height:1.65;color:#526080}.callout{border-radius:16px;padding:20px 22px;background:#eaf2ff;border-left:6px solid #5c79e2;font-size:1.18rem;line-height:1.5;font-weight:750;margin:20px 0}.callout.lime{background:#effbd7;border-color:#a6d643}.callout.peach{background:#fff1e9;border-color:#f4aa7e}.vocab-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:9px;margin:17px 0}.vocab-item{border:1px solid #dce4f2;background:#f7f9fe;border-radius:12px;padding:13px 15px;font-size:.93rem}.vocab-item strong{color:#14275d}.teach-list{margin:18px 0;padding-left:23px;line-height:1.65;color:#415171}.teach-list li{margin:8px 0}.model{border-radius:14px;background:#182a61;color:white;padding:20px 24px;margin-top:20px;line-height:1.75}.model strong{display:block;color:#c9f36b;text-transform:uppercase;letter-spacing:.08em;font-size:.77rem;margin-bottom:8px}.quiz-top{display:flex;align-items:center;justify-content:space-between;gap:12px}.quiz-count{font-size:.84rem;color:#657396;font-weight:850}.progress{height:8px;border-radius:99px;background:#e8edfa;overflow:hidden;margin:16px 0 26px}.progress span{display:block;height:100%;background:#a8d943;transition:width .25s}.question{font-size:clamp(1.5rem,2.6vw,2.1rem);font-weight:850;letter-spacing:-.04em;line-height:1.2;margin:18px 0 25px}.choices{display:grid;gap:10px}.choice{width:100%;text-align:left;border:2px solid #e1e7f4;background:#f7f9fe;color:#1b2c60;border-radius:13px;padding:14px 18px;font-weight:780;line-height:1.35}.choice:hover:not(:disabled){border-color:#7389de;background:#f0f4ff}.choice.correct{background:#e9f7c5;border-color:#8bc12c}.choice.wrong{background:#ffe5dd;border-color:#ec927d}.choice:disabled{cursor:default}.feedback{min-height:45px;margin-top:13px;color:#234a16;font-weight:780;line-height:1.4}.feedback.error{color:#a73926}.quiz-actions{display:flex;gap:9px;flex-wrap:wrap;margin-top:11px}.primary,.secondary,.finish{border:0;border-radius:11px;padding:12px 17px;font-weight:850}.primary{background:#172661;color:#fff}.primary:hover{background:#3148a1}.secondary{background:#e9eefb;color:#20356d}.secondary:hover{background:#dce5fa}.finish{background:#c9f36b;color:#162661}.stage-controls{display:flex;align-items:center;justify-content:space-between;gap:10px;padding-top:13px}.stage-controls span{font-size:.84rem;color:#647294;font-weight:780}.stage-controls button:disabled{opacity:.4;cursor:default}.task-steps{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:10px;margin:23px 0}.task-step{background:#f5f7fd;border:1px solid #dce4f2;border-radius:13px;padding:14px;line-height:1.45;font-size:.9rem}.task-step strong{display:block;color:#5166ba;font-size:.8rem;margin-bottom:5px}.exit-check{display:flex;align-items:center;gap:12px;border:1px solid #c6dfa1;background:#f1fbdc;border-radius:14px;padding:17px 19px;margin-top:25px}.exit-check input{width:22px;height:22px;accent-color:#547f19}.exit-check label{font-weight:850;line-height:1.4}.footer{max-width:1260px;margin:35px auto 0;color:#7b86a1;font-size:.75rem}.projector-on .sidebar,.projector-on .teacher-card,.projector-on .footer{display:none}.projector-on .app{grid-template-columns:1fr}.projector-on .main{padding-inline:clamp(24px,5vw,90px)}.projector-on .lesson-card{min-height:500px}.projector-on .question{font-size:clamp(2rem,4vw,3rem)}.projector-on .choice{font-size:1.25rem}.projector-on .projector{background:#172661;color:#fff}@media(max-width:1060px){.app{grid-template-columns:245px minmax(0,1fr)}.work-area{grid-template-columns:1fr}.teacher-card{margin-top:0}.topbar{flex-wrap:wrap}}@media(max-width:720px){.app{grid-template-columns:1fr}.sidebar{display:none;position:fixed;z-index:20;width:min(310px,86vw);box-shadow:15px 0 50px #10204a45}.app.menu-open .sidebar{display:flex}.mobile-menu{display:block}.topbar{gap:10px}.topbar>.eyebrow{margin-right:auto}.top-actions{width:100%;justify-content:space-between}.lesson-head{margin:25px auto 22px}.lesson-head h1{font-size:2.7rem}.teacher-card{padding:21px}.task-steps{grid-template-columns:1fr}.stage-tabs{margin-right:-18px}.projector-on .sidebar{display:none!important}}@media(max-width:470px){.main{padding:18px 14px 24px}.timer{gap:4px}.timer button{padding:6px}.projector{padding:9px}.vocab-grid{grid-template-columns:1fr}.lesson-card{padding:20px}.stage-tab{padding:10px}.question{font-size:1.55rem}}