:root{color:#1d2925;font-synthesis:none;text-rendering:optimizelegibility;background:#f5f7f5;font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif}*{box-sizing:border-box}body{min-width:320px;min-height:100vh;margin:0}button,input,textarea,select{font:inherit}button,a{-webkit-tap-highlight-color:transparent}button:focus-visible,a:focus-visible,input:focus-visible{outline-offset:3px;outline:3px solid #2d695447}h1,h2,p{margin-top:0}.centered-page,.login-page,.lesson-placeholder-page{place-items:center;min-height:calc(100vh - 4.75rem);padding:2rem;display:grid}.centered-page{color:#60706a;text-align:center;align-content:center;gap:.75rem}.loading-indicator{border:3px solid #d8e2de;border-top-color:#2d6954;border-radius:50%;width:1.75rem;height:1.75rem;animation:.8s linear infinite spin}@keyframes spin{to{transform:rotate(360deg)}}.login-page{background:radial-gradient(circle at 12% 15%,#62978121,#0000 30rem),#f3f6f4;min-height:100vh}.login-card{background:#fff;border:1px solid #dce4e0;border-radius:1.35rem;width:min(100%,28rem);padding:clamp(2rem,7vw,3rem);box-shadow:0 1.5rem 4rem #1e3a3117}.login-brand-mark,.brand-mark{color:#fff;letter-spacing:-.03em;background:#2d6954;place-items:center;font-weight:750;display:grid}.login-brand-mark{border-radius:.9rem;width:3rem;height:3rem;margin-bottom:1.75rem}.eyebrow{color:#3e745f;letter-spacing:.12em;text-transform:uppercase;margin-bottom:.7rem;font-size:.75rem;font-weight:750}.login-card h1,.page-heading h1,.content-message h1{color:#17221e;letter-spacing:-.045em;margin-bottom:.75rem;font-size:clamp(2rem,6vw,3.1rem);line-height:1.08}.login-intro,.page-heading>p:last-child,.content-message>p:not(.eyebrow){color:#60706a;line-height:1.65}.login-intro{margin-bottom:2rem}.login-form{gap:.65rem;display:grid}.login-form label{color:#35443f;margin-top:.55rem;font-size:.9rem;font-weight:680}.login-form input{color:#17221e;background:#fff;border:1px solid #bfcac5;border-radius:.7rem;width:100%;min-height:3rem;padding:.7rem .85rem}.login-form input:hover{border-color:#7b9087}.login-form input:focus{border-color:#2d6954}.form-error,.header-error{color:#963c36;font-size:.9rem}.form-error{margin:.55rem 0 0}.primary-button{color:#fff;cursor:pointer;background:#2d6954;border:0;border-radius:.75rem;min-height:3.1rem;margin-top:1rem;font-weight:720}.primary-button:hover:not(:disabled){background:#235743}.primary-button:disabled,.text-button:disabled{cursor:wait;opacity:.65}.app-shell{min-height:100vh}.app-header{background:#fffffff0;border-bottom:1px solid #dfe6e2;justify-content:space-between;align-items:center;min-height:4.75rem;padding:0 5vw;display:flex}.brand{color:#17221e;align-items:center;gap:.75rem;font-weight:760;text-decoration:none;display:inline-flex}.brand-mark{border-radius:.68rem;width:2.25rem;height:2.25rem;font-size:.75rem}.account-area{align-items:center;gap:.75rem;display:flex}.account-name{color:#35443f;font-weight:650}.role-badge{color:#35614f;letter-spacing:.04em;text-transform:uppercase;background:#f1f7f4;border:1px solid #c8d9d2;border-radius:999px;padding:.25rem .55rem;font-size:.72rem;font-weight:750}.text-button{color:#365d4e;cursor:pointer;background:0 0;border:0;border-radius:.55rem;padding:.55rem .75rem;font-weight:680}.text-button:hover:not(:disabled){background:#eff4f1}.header-error{text-align:right;background:#fff5f3;border-bottom:1px solid #efd3cf;margin:0;padding:.75rem 5vw}.dashboard-main{width:min(100% - 2rem,68rem);margin:0 auto;padding:clamp(2.5rem,6vw,5rem) 0}.page-heading{margin-bottom:2rem}.page-heading>p:last-child{margin-bottom:0}.lesson-list{gap:.75rem;margin:0;padding:0;list-style:none;display:grid}.lesson-row{background:#fff;border:1px solid #dce4e0;border-radius:.95rem;overflow:hidden;box-shadow:0 .2rem .9rem #1e3a3108}.lesson-row-content{min-height:6.6rem;color:inherit;grid-template-columns:3.75rem minmax(0,1fr) minmax(8rem,11rem) 1.5rem;align-items:center;gap:1rem;padding:1rem 1.25rem;text-decoration:none;display:grid}.lesson-link{transition:border-color .16s,background-color .16s,transform .16s}.lesson-link:hover{background:#fbfdfc;transform:translateY(-1px)}.lesson-number{color:#487363;font-variant-numeric:tabular-nums;font-size:1.1rem;font-weight:780}.lesson-details{gap:.28rem;min-width:0;display:grid}.lesson-label,.homework-label{color:#71807a;letter-spacing:.08em;text-transform:uppercase;font-size:.72rem;font-weight:720}.lesson-title{color:#1b2924;text-overflow:ellipsis;white-space:nowrap;font-size:1.02rem;font-weight:700;overflow:hidden}.status,.homework-state{color:#5b6964;align-items:center;gap:.28rem;font-size:.82rem;display:inline-flex}.status-available,.status-in_progress,.status-completed{color:#376d58}.homework-placeholder{border-left:1px solid #e5eae7;gap:.4rem;padding-left:1.25rem;display:grid}.lock-icon{flex:none}.row-arrow{color:#487363;font-size:1.25rem}.lesson-row-locked{box-shadow:none;background:#f5f7f6;border-color:#e5e9e7}.lesson-row-locked .lesson-row-content{color:#84908b}.lesson-row-locked .lesson-number,.lesson-row-locked .lesson-title,.lesson-row-locked .status,.lesson-row-locked .homework-state{color:#79847f}.lesson-placeholder-page{background:#f5f7f5}.content-message{background:#fff;border:1px solid #dce4e0;border-radius:1.2rem;width:min(100%,42rem);padding:clamp(2rem,6vw,3.5rem);box-shadow:0 1rem 3rem #1e3a310f}.content-message h2{margin-bottom:.65rem}.secondary-link{color:#2d6954;text-underline-offset:.2em;margin-top:.75rem;font-weight:720;display:inline-flex}.lesson-layout{grid-template-columns:14.5rem minmax(0,45rem);gap:clamp(2.5rem,6vw,7rem);width:min(100% - 3rem,72rem);margin:0 auto;padding:3rem 0 6rem;display:grid}.lesson-sidebar-inner{position:sticky;top:2rem}.sidebar-label,.chapter-kicker,.preview-label,.speaking-meta,.sentence-number{color:#71807a;letter-spacing:.08em;text-transform:uppercase;font-size:.75rem;font-weight:720}.sidebar-label{margin:0 0 1rem .85rem}.section-link-list{gap:.15rem;display:grid}.lesson-section-link{color:#52615b;border-left:2px solid #0000;border-radius:0 .55rem .55rem 0;align-items:center;min-height:2.75rem;padding:.6rem .9rem;font-size:.9rem;text-decoration:none;display:flex}.lesson-section-link:hover{background:#eef3f0}.lesson-section-link.is-active{color:#17221e;background:#eaf2ed;border-left-color:#2d6954;font-weight:700}.sidebar-back{color:#35614f;margin:1.8rem .9rem 0;font-size:.87rem;font-weight:680;text-decoration:none;display:inline-block}.sidebar-back:hover,.lesson-back-link:hover{text-decoration:underline}.lesson-article{min-width:0}.lesson-hero{border-bottom:1px solid #dce4e0;padding:.5rem 0 3.25rem}.lesson-back-link{color:#35614f;align-items:center;min-height:2.75rem;margin-bottom:2rem;font-size:.88rem;font-weight:700;text-decoration:none;display:inline-flex}.lesson-hero h1{color:#17221e;letter-spacing:-.045em;margin:0 0 1rem;font-size:clamp(2.2rem,5vw,3.7rem);line-height:1.08}.lesson-goal{color:#52615b;max-width:38rem;margin:0 0 1.6rem;font-size:1.06rem;line-height:1.7}.lesson-meta{color:#60706a;flex-wrap:wrap;align-items:center;gap:.7rem;font-size:.88rem;display:flex}.lesson-meta>span+span:before{color:#a9b6ae;content:"·";margin-right:.7rem}.lesson-status{color:#2d6954;font-weight:700}.lesson-chapter{border-bottom:1px solid #dce4e0;padding:3.5rem 0 4rem;scroll-margin-top:1.5rem}.lesson-chapter:last-child{border-bottom:0}.chapter-heading{margin-bottom:2rem}.chapter-kicker{margin-bottom:.65rem}.chapter-heading h2{color:#17221e;letter-spacing:-.035em;margin:0;font-size:clamp(1.7rem,3vw,2.1rem)}.chapter-time{color:#71807a;margin:.6rem 0 0;font-size:.85rem}.chapter-body{gap:1.4rem;display:grid}.lesson-prose{color:#35443f;font-size:1rem;line-height:1.75}.lesson-prose>:last-child{margin-bottom:0}.lesson-prose p,.lesson-prose ul,.lesson-prose blockquote{margin:0 0 1rem}.lesson-prose ul{padding-left:1.4rem}.lesson-prose li+li{margin-top:.32rem}.lesson-prose h3{color:#17221e;margin:1.5rem 0 .65rem;font-size:1.22rem;line-height:1.35}.lesson-prose h3:first-child{margin-top:0}.lesson-prose blockquote{color:#35443f;background:#f5f9f6;border-left:3px solid #b9d1c4;padding:.5rem 1rem}.russian-support{margin-top:1rem}.russian-support button{color:#2d6954;cursor:pointer;background:#fff;border:1px solid #c8d9d2;border-radius:.6rem;min-height:2.75rem;padding:.45rem .8rem;font-size:.85rem;font-weight:700}.russian-support button:hover{background:#f1f7f4}.russian-support p{color:#35443f;background:#f1f7f4;border-left:3px solid #b9d1c4;margin:.8rem 0 0;padding:1rem 1.2rem;line-height:1.65}.vocabulary-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:.85rem;display:grid}.vocabulary-card,.question-preview,.speaking-card,.sentence-listening-card{background:#fff;border:1px solid #dce4e0;border-radius:.95rem}.vocabulary-card{min-width:0;padding:1.25rem}.vocabulary-card-heading{justify-content:space-between;align-items:start;gap:.5rem;display:flex}.vocabulary-card h3{color:#17221e;letter-spacing:-.025em;margin:0 0 1rem;font-size:1.2rem}.vocabulary-card-heading button{cursor:not-allowed;opacity:.65;background:#f8faf8;border:1px solid #e2e9e5;border-radius:.55rem;min-width:2.75rem;min-height:2.75rem}.vocabulary-card dl{gap:.65rem;margin:0;display:grid}.vocabulary-card dl>div{gap:.15rem;display:grid}.vocabulary-card dt,.vocabulary-example span{color:#71807a;letter-spacing:.06em;text-transform:uppercase;font-size:.72rem;font-weight:720}.vocabulary-card dd{color:#35443f;margin:0;line-height:1.5}.vocabulary-example{color:#35443f;border-top:1px solid #edf1ee;margin:1rem 0 0;padding-top:.9rem;font-size:.9rem;line-height:1.6}.vocabulary-example span{margin-bottom:.1rem;display:block}.question-list,.speaking-list,.listening-sentences{gap:.85rem;display:grid}.preview-intro{color:#60706a;margin:0 0 .3rem;font-size:.9rem}.question-preview{padding:1.3rem 1.45rem}.preview-heading{color:#71807a;align-items:center;gap:.7rem;margin-bottom:.7rem;font-size:.82rem;display:flex}.preview-label{color:#426b58;background:#f1f7f4;border-radius:.4rem;padding:.28rem .5rem;font-size:.67rem;display:inline-flex}.question-preview .lesson-prose{color:#17221e;font-weight:600}.preview-options{gap:.4rem;margin:1rem 0 0;padding:0;list-style:none;display:grid}.preview-options li{color:#52615b;background:#fbfcfb;border:1px solid #e5ebe7;border-radius:.55rem;align-items:center;gap:.7rem;min-height:2.7rem;padding:.45rem .7rem;display:flex}.option-letter{color:#487363;border:1px solid #cbd8d0;border-radius:50%;flex:none;place-items:center;width:1.55rem;height:1.55rem;font-size:.72rem;font-weight:720;display:grid}.preview-response{color:#84908b;border-bottom:1px solid #cbd8d0;margin:1rem 0 0;padding:.75rem 0;font-size:.85rem}.speaking-card{padding:1.5rem}.speaking-meta{align-items:center;gap:.7rem;display:flex}.speaker-chip{color:#35614f;letter-spacing:.02em;text-transform:none;background:#f1f7f4;border-radius:999px;padding:.3rem .6rem;font-size:.68rem}.speaking-card h3{color:#17221e;margin:1rem 0;font-size:1.13rem;line-height:1.5}.speaking-support{color:#60706a;background:#f5f7f5;border-radius:.6rem;margin:-.35rem 0 1rem;padding:.75rem .9rem;font-size:.86rem;line-height:1.55}.speaking-support>span{color:#487363;letter-spacing:.06em;text-transform:uppercase;font-size:.7rem;font-weight:720}.speaking-support ul{margin:.4rem 0 0;padding-left:1.2rem}.speaking-card details{color:#52615b;font-size:.9rem}.speaking-card summary{color:#2d6954;cursor:pointer;min-height:2.75rem;padding:.7rem 0;font-weight:680}.speaking-card ul{margin:.25rem 0 0;padding-left:1.25rem;line-height:1.65}.speaking-hint{color:#84908b;margin:.8rem 0 0;font-size:.8rem}.speaking-rating{border:0;border-top:1px solid #e5eae7;margin:1.2rem 0 0;padding:1rem 0 0}.speaking-rating legend{color:#60706a;font-size:.78rem;font-weight:700}.listening-intro,.listening-stage-body{background:#fff;border:1px solid #dce4e0;border-radius:.95rem;padding:1.5rem}.listening-intro h3,.listening-stage-body h3{color:#17221e;margin:.7rem 0;font-size:1.2rem}.listening-intro p,.listening-stage-body>p:not(.eyebrow){color:#60706a;margin-bottom:0;line-height:1.6}.sentence-listening-card{flex-wrap:wrap;align-items:center;gap:.6rem 1rem;padding:1rem 1.25rem;display:flex}.sentence-listening-card button,.audio-placeholder{color:#71807a;cursor:not-allowed;background:#f8faf8;border:1px solid #dce4e0;border-radius:.6rem;min-height:2.75rem;padding:.5rem .85rem}.sentence-listening-card p{color:#71807a;width:100%;margin:0;font-size:.85rem}.sentence-question{gap:.7rem;width:100%;display:grid}.sentence-question .question-preview{background:#fbfdfc;width:100%}.sentence-question .sentence-transcript-note{color:#71807a;font-size:.8rem}.listening-stage-tabs{grid-template-columns:repeat(3,1fr);gap:.3rem;margin-bottom:.85rem;display:grid}.listening-stage-tabs span{color:#84908b;text-align:center;border-bottom:2px solid #dce4e0;padding:.75rem .5rem;font-size:.75rem;font-weight:700}.listening-stage-tabs .stage-current{color:#2d6954;border-bottom-color:#2d6954}.listening-stage-tabs .stage-complete{color:#526b60;border-bottom-color:#9bb8aa}.audio-placeholder{margin-top:1rem}.stage-button{color:#fff;cursor:pointer;background:#2d6954;border:0;border-radius:.6rem;align-items:center;min-height:2.75rem;margin:1rem 0 0 .7rem;padding:.55rem .95rem;font-weight:700;display:inline-flex}.stage-button:hover:not(:disabled){background:#235743}.stage-button:disabled{opacity:.65;cursor:wait}.transcript-panel,.listening-questions{border-top:1px solid #e5ebe7;margin-top:1.5rem;padding-top:1.5rem}.transcript-panel>p:not(.eyebrow){color:#35443f;line-height:1.75}.copy-button{color:#2d6954;cursor:pointer;background:#fff;border:1px solid #bfcac5;border-radius:.6rem;min-height:2.75rem;padding:.55rem .9rem;font-weight:700}.copy-button:hover{background:#f1f7f4}.copy-status{color:#52615b;margin-left:.65rem;font-size:.85rem}.listening-questions .question-list{margin-top:1rem}.stage-error{color:#963c36;margin:1rem 0 0}.teacher-observation{background:#f8faf8;border:1px solid #dce4e0;border-radius:.95rem;padding:1.4rem}.teacher-observation>p{color:#60706a;font-size:.88rem}.teacher-observation fieldset{border:0;border-bottom:1px solid #e1e9e4;margin:0;padding:1rem 0}.teacher-observation legend,.teacher-note-label{color:#35443f;font-size:.9rem;font-weight:700}.rating-choices{flex-wrap:wrap;gap:.4rem;margin-top:.5rem;display:flex}.rating-choices label{color:#52615b;background:#fff;border:1px solid #dce4e0;border-radius:999px;align-items:center;gap:.35rem;min-height:2.75rem;padding:.5rem .7rem;font-size:.83rem;display:inline-flex}.rating-choices input{accent-color:#2d6954}.teacher-note-label{margin-top:1.4rem;display:block}.teacher-note-label textarea{resize:vertical;background:#fff;border:1px solid #bfcac5;border-radius:.65rem;width:100%;margin-top:.55rem;padding:.75rem;font-weight:400;display:block}.mobile-sections-bar,.drawer-overlay,.sections-drawer{display:none}@media (width<=850px){.lesson-layout{width:min(100% - 2rem,45rem);padding-top:1.8rem;display:block}.lesson-sidebar{display:none}.mobile-sections-bar{z-index:20;background:#f5f7f5f5;border-bottom:1px solid #dce4e0;align-items:center;gap:.75rem;min-height:3.9rem;padding:.55rem 1rem;display:flex;position:sticky;top:0}.sections-trigger{color:#365d4e;cursor:pointer;background:#fff;border:1px solid #bfcac5;border-radius:.65rem;align-items:center;gap:.5rem;min-height:2.75rem;padding:.45rem .8rem;font-weight:700;display:inline-flex}.mobile-active-section{color:#60706a;text-overflow:ellipsis;white-space:nowrap;font-size:.82rem;overflow:hidden}.drawer-overlay{z-index:40;cursor:pointer;background:#17221e52;border:0;width:100%;display:block;position:fixed;inset:0}.sections-drawer{z-index:41;background:#fff;border-right:1px solid #dce4e0;width:min(21rem,88vw);padding:1.2rem;display:block;position:fixed;inset:0 auto 0 0;overflow-y:auto;box-shadow:1rem 0 3rem #1e3a311a}.drawer-heading{justify-content:space-between;align-items:center;margin-bottom:1rem;display:flex}.drawer-heading h2{margin:0;font-size:1rem}.drawer-heading button{color:#365d4e;cursor:pointer;background:0 0;border:0;border-radius:.55rem;width:2.75rem;height:2.75rem;font-size:1.6rem}.lesson-chapter{scroll-margin-top:5rem}}@media (width<=560px){.lesson-layout{width:min(100% - 1.4rem,45rem)}.lesson-hero{padding-bottom:2.4rem}.lesson-back-link{margin-bottom:1.3rem}.lesson-chapter{padding:2.5rem 0 3rem}.vocabulary-grid{grid-template-columns:1fr}.question-preview,.speaking-card,.listening-stage-body{padding:1.1rem}.listening-stage-tabs span{font-size:.65rem}.stage-button{margin-left:0}}@media (width<=700px){.app-header{min-height:4.25rem;padding:.65rem 1rem}.brand>span:last-child,.account-name{display:none}.account-area{gap:.4rem}.dashboard-main{width:min(100% - 1.25rem,68rem);padding-top:2.25rem}.lesson-row-content{grid-template-columns:2.4rem minmax(0,1fr) 1rem;gap:.75rem;min-height:7.5rem;padding:.9rem}.lesson-title{white-space:normal}.homework-placeholder{border-top:1px solid #e5eae7;border-left:0;grid-column:2/3;padding:.7rem 0 0}.row-arrow{grid-area:1/3/3}.centered-page,.login-page,.lesson-placeholder-page{padding:1rem}.login-card,.content-message{padding:1.75rem}}@media (prefers-reduced-motion:reduce){*,:before,:after{scroll-behavior:auto!important;transition-duration:.01ms!important;animation-duration:.01ms!important;animation-iteration-count:1!important}}.exercise-block{gap:1rem;display:grid}.exercise-item{border:1px solid var(--border,#deded8);background:#fff;border-radius:14px;min-width:0;padding:1.25rem;transition:background-color .18s,border-color .18s}.exercise-item input[type=text],.exercise-item textarea{width:100%;min-height:48px;font:inherit;color:#26372b;background:#fff;border:1px solid #b8bdb5;border-radius:8px;padding:.75rem}.exercise-item textarea{resize:vertical}.exercise-answer-label{margin:.75rem 0 .4rem;font-weight:600;display:block}.exercise-options{border:0;gap:.6rem;min-width:0;margin:1rem 0 0;padding:0;display:grid}.exercise-options label{cursor:pointer;overflow-wrap:anywhere;border:1px solid #dce0d9;border-radius:9px;align-items:center;gap:.65rem;min-height:48px;padding:.75rem;transition:background-color .15s;display:flex}.exercise-options .option-selected{background:#edf0ed;border-color:#7a877b}.exercise-options input{accent-color:#506654;flex:none}.exercise-options:disabled label{cursor:default}.exercise-options:disabled input{opacity:1}.exercise-manual{background:#fafaf7}.manual-label,.exercise-hint{color:#627063;font-size:.875rem;line-height:1.6}.manual-label{text-align:right}.exercise-correct{background:#f0f7f1;border-color:#93b49c}.exercise-wrong{background:#fcf3f1;border-color:#d4a29c}.exercise-feedback{overflow-wrap:anywhere;margin-top:1rem;line-height:1.6}.exercise-feedback p{margin:.35rem 0}.exercise-correct .exercise-feedback{color:#245c37}.exercise-wrong .exercise-feedback{color:#923f35}.exercise-actions{padding:.5rem 0}.check-answers-button{color:#fff;min-height:48px;font:inherit;cursor:pointer;background:#355b42;border:0;border-radius:9px;padding:.8rem 1.4rem;font-weight:600}.check-answers-button:disabled{color:#4c5b4e;cursor:default;background:#d6dcd5}.order-sequence,.order-bank{flex-wrap:wrap;gap:.5rem;display:flex}.order-sequence{background:#f8faf7;border:1px dashed #9ca99b;border-radius:9px;align-items:center;min-height:64px;margin-bottom:.75rem;padding:.75rem}.order-answer button{color:#2d4031;min-height:44px;font:inherit;cursor:pointer;background:#fff;border:1px solid #b9c5b8;border-radius:8px;padding:.6rem .9rem;transition:background-color .15s,transform .15s}.order-answer button:not(:disabled):active{transform:translateY(-2px)}.order-sequence button{animation:.16s ease-out sentence-chip-appear}@keyframes sentence-chip-appear{0%{opacity:0;transform:translateY(3px)}to{opacity:1;transform:translateY(0)}}.order-bank button:disabled{opacity:.35}.order-sequence button:disabled{opacity:1;cursor:default}.development-note{background:#f4f6f1;border-left:3px solid #a2b0a0;padding:1rem}.sr-only{clip:rect(0, 0, 0, 0);white-space:nowrap;border:0;width:1px;height:1px;padding:0;position:absolute;overflow:hidden}@media (width<=600px){.exercise-item{padding:1rem}.exercise-item .preview-heading{flex-wrap:wrap}.manual-label{text-align:left}.check-answers-button{width:100%}}@media (prefers-reduced-motion:reduce){.exercise-item,.exercise-options label,.order-answer button{transition:none;animation:none}}.lesson-main-link{min-height:4.5rem;color:inherit;border-radius:.5rem;grid-column:1/3;grid-template-columns:3.75rem minmax(0,1fr);align-items:center;gap:1rem;text-decoration:none;display:grid}.homework-open-link{color:#285b46;text-underline-offset:.2em;align-items:center;min-height:2.75rem;font-size:.88rem;font-weight:700;display:inline-flex}.lesson-finish .homework-open-link{margin-right:1rem}.homework-main{width:min(100% - 2rem,48rem);margin:0 auto;padding:2rem 0 4rem}.homework-heading{margin:2rem 0 1.5rem}.homework-heading h1{font-size:clamp(1.8rem,5vw,2.5rem)}.homework-progress,.homework-section,.homework-corrections{background:#fff;border:1px solid #dce4e0;border-radius:.95rem;margin:1.25rem 0;padding:1.5rem;scroll-margin-top:1.5rem}.homework-progress progress{accent-color:#376d58;width:100%;height:.8rem}.homework-section-heading{flex-wrap:wrap;justify-content:space-between;align-items:center;gap:.5rem;display:flex}.homework-section-heading h2{margin:0}.homework-section-heading span,.draft-save-status{color:#5b6964;font-size:.85rem}.homework-section .exercise-block{margin-top:1rem}.homework-section-nav{flex-wrap:wrap;gap:.5rem;margin:1.5rem 0;display:flex}.homework-section-nav a,.correction-list button{color:#285b46;background:#f5f8f6;border:1px solid #dce4e0;border-radius:.6rem;align-items:center;min-height:2.75rem;padding:.6rem .8rem;font-size:.9rem;text-decoration:none;display:inline-flex}.correction-list{flex-wrap:wrap;gap:.5rem;margin-bottom:1.5rem;display:flex}.correction-list button[aria-pressed=true]{background:#e6f1eb;border-color:#376d58}.correction-required,.audio-pending-note{color:#62502f;background:#f7f2e8;border-radius:.65rem;padding:.85rem 1rem}.core-ready,.correction-summary{color:#285b46}.first-attempt-result{font-size:1.2rem;font-weight:700}.writing-task,.audio-task-placeholder{border-top:1px solid #e5eae7;padding:1rem 0}.writing-task label{margin:.75rem 0 .4rem;font-weight:600;display:block}.writing-task textarea{color:#1b2924;width:100%;min-height:9rem;font:inherit;resize:vertical;border:1px solid #bbc9c1;border-radius:.6rem;padding:.85rem;font-size:1rem;line-height:1.6;display:block}.writing-task textarea:disabled{opacity:1;color:#42564a;background:#f5f7f6}.homework-corrections .secondary-link{min-height:2.75rem;margin-top:1rem}.changed-example{border-top:1px solid #e5eae7;margin:1rem 0;padding-top:1rem}@media (width<=700px){.lesson-main-link{grid-template-columns:2.4rem minmax(0,1fr);gap:.75rem}.homework-placeholder{grid-column:1/3;padding-left:3.15rem}.homework-main{width:min(100% - 1.25rem,48rem);padding-top:1.25rem}.homework-progress,.homework-section,.homework-corrections{padding:1rem}.homework-section .exercise-item{padding:.85rem}.homework-section .exercise-actions{align-items:stretch}}.stored-audio{gap:.6rem;margin:.75rem 0;display:grid}.stored-audio audio{width:100%;max-width:24rem}.stored-audio-compact{margin:0;display:inline-flex}.stored-audio-compact audio{display:none}.audio-play-button,.recording-actions button{color:#285b46;min-height:2.75rem;font:inherit;background:#f5f8f6;border:1px solid #bbc9c1;border-radius:.6rem;padding:.6rem .85rem}.audio-homework-task{border-top:1px solid #e5eae7;padding:1.25rem 0}.recording-actions{flex-wrap:wrap;gap:.6rem;display:flex}.manual-review{margin:1rem 0}.manual-review fieldset{border:1px solid #dce4e0;border-radius:.6rem;padding:1rem}.manual-review label{margin:.7rem 0;display:block}.manual-review textarea,.manual-review select{width:100%;min-height:2.75rem;font:inherit;border:1px solid #bbc9c1;border-radius:.6rem;margin:.5rem 0;padding:.7rem;display:block}.teacher-feedback{color:#285b46;white-space:pre-wrap}.teacher-editor{max-width:1180px;margin:1rem auto;padding:0 1rem}.editor-entry,.editor-toolbar,.editor-item-actions,.editor-tabs{flex-wrap:wrap;align-items:center;gap:.65rem;display:flex}.teacher-editor button,.editor-list button{color:#22354d;cursor:pointer;background:#fff;border:1px solid #b6bcc6;border-radius:.5rem;padding:.55rem .85rem}.teacher-editor button:disabled{opacity:.5;cursor:default}.editor-workspace{background:#f2f7fb;border:2px solid #8cabc5;border-radius:1rem;margin-top:1rem;padding:1.5rem}.editor-toolbar{z-index:20;background:#e8f0f7;border-radius:.5rem;padding:.8rem;position:sticky;top:0}.editor-tabs{margin:1rem 0}.editor-tabs [aria-selected=true]{color:#fff;background:#24496a}.editor-card,.editor-block,.editor-correction{background:#fff;border:1px solid #cbd6df;border-radius:.6rem;margin:.7rem 0;padding:.8rem}.editor-card>summary,.editor-block>summary,.editor-correction>summary{cursor:pointer;font-weight:600}.editor-fields{gap:.8rem;margin:1rem 0;display:grid}.editor-field{gap:.35rem;font-weight:500;display:grid}.editor-field input,.editor-field textarea,.editor-field select,.editor-item-actions select{color:#22354d;width:100%;min-width:0;font:inherit;background:#fff;border:1px solid #aab9c6;border-radius:.4rem;padding:.55rem}.editor-field textarea{resize:vertical}.editor-check{align-items:center;gap:.5rem;display:flex}.editor-help,.editor-audio-status{color:#506174;font-size:.9rem}.editor-error{white-space:pre-wrap;color:#a12323}.draft-badge{color:#294c73;background:#e6edf8;border-radius:1rem;padding:.3rem .7rem;font-size:.85rem}.publish-confirmation{background:#fff;border:2px solid #24496a;border-radius:.7rem;margin:1rem 0;padding:1.2rem}.preview-banner{z-index:19;color:#fff;background:#24496a;flex-wrap:wrap;align-items:center;gap:1rem;margin:1rem 0;padding:1rem;display:flex;position:sticky;top:4.5rem}.draft-preview{border:2px dashed #8cabc5;margin-top:1rem}.homework-preview{padding:1.5rem}@media (width<=640px){.editor-workspace{padding:.8rem}.editor-toolbar{position:static}}.desktop-sections-bar{z-index:20;color:#52615b;background:#f5f7f5;border-bottom:1px solid #dce4e0;align-items:center;gap:1rem;padding:.6rem 2rem;display:flex;position:sticky;top:0}.sections-trigger{color:#365d4e;min-height:44px;font:inherit;cursor:pointer;background:#fff;border:1px solid #bfcac5;border-radius:8px;padding:.5rem .9rem;font-weight:650}.lesson-layout{grid-template-columns:0 minmax(0,1fr);gap:0;width:calc(100% - 4rem);max-width:none;transition:grid-template-columns .24s,gap .24s}.lesson-article{grid-column:2}.lesson-layout.sidebar-open{grid-template-columns:15rem minmax(0,1fr);gap:2rem}.lesson-sidebar[hidden]{display:none}.lesson-sidebar-inner{max-height:calc(100vh - 6rem);top:5rem;overflow-y:auto}.lesson-sidebar .sections-trigger{margin-bottom:1.25rem}.lesson-chapter{scroll-margin-top:5rem}.lesson-article .lesson-prose{max-width:78ch}.exercise-item .lesson-prose{max-width:none}.exercise-options label{background:#fff;min-height:56px;padding:1rem;position:relative}.exercise-options input[type=radio]{opacity:0;width:1px;height:1px;position:absolute}.exercise-options label:has(input:focus-visible){outline-offset:2px;outline:3px solid #668b9a}.exercise-options label:hover:has(input:enabled){border-color:#69897c}.exercise-options .option-selected{background:#eaf1f5;border:2px solid #446e83;padding:calc(1rem - 1px)}.option-mark{color:#446e83;margin-left:auto;font-weight:700}.exercise-options .option-correct{background:#edf5ef;border-color:#5c8466}.exercise-options .option-wrong{background:#faf0ee;border-color:#ab7069}.option-correct .option-mark{color:#245c37}.option-wrong .option-mark{color:#923f35}.vocabulary-card h3{color:#315d72;font-size:1.5rem;font-weight:750}.vocabulary-card dl{color:#52615b}.vocabulary-example{border-top:1px solid #e4e9e6;margin-top:1.25rem;padding-top:1rem}.grammar-groups{gap:1rem;display:grid}.grammar-group{background:#fff;border:1px solid #dce4e0;border-radius:12px;padding:1.4rem}.grammar-group h3{color:#315d72;margin:0 0 1rem}.grammar-group details{margin-top:.8rem}.grammar-rule>.lesson-prose{border-left:3px solid #8baba2;margin-top:1rem;padding-left:1rem}.grammar-examples{background:#f5f7f9;border-radius:8px;padding:1rem}.grammar-examples blockquote{background:0 0;border-left-color:#809ba9}.disclosure-hide,details[open]>summary>.disclosure-show{display:none}details[open]>summary>.disclosure-hide{display:inline}.teacher-class-tools{flex-wrap:wrap;align-items:center;gap:1rem;padding:.7rem 2rem;display:flex}.teacher-class-tools .teacher-editor{flex:1;max-width:none;margin:0}.teacher-sidecar{width:min(100% - 3rem,80rem);margin:2rem auto 5rem}.sidecar-heading{flex-wrap:wrap;justify-content:space-between;align-items:start;gap:1rem;display:flex}.sidecar-save{align-items:center;gap:.8rem;display:flex;position:sticky;top:1rem}.teacher-sidecar section{background:#fff;border:1px solid #dce4e0;border-radius:12px;margin:2rem 0;padding:1.5rem}.starting-notes{grid-template-columns:repeat(2,minmax(0,1fr));gap:1.5rem;display:grid}.starting-notes label{gap:.75rem;display:grid}.teacher-sidecar textarea{width:100%;font:inherit;resize:vertical;border:1px solid #bfcac5;border-radius:8px;padding:.8rem}.sidecar-rating{border:0;border-bottom:1px solid #e4e9e6;margin-bottom:1rem;padding:1rem 0}.sidecar-rating legend{font-weight:650}.sidecar-rating .rating-choices{flex-wrap:wrap;gap:.6rem;display:flex}.sidecar-rating label{cursor:pointer;border:1px solid #dce4e0;border-radius:8px;min-height:44px;padding:.7rem}.sidecar-rating .rating-selected{background:#eaf1f5;border-color:#446e83}@media (width>=851px){.lesson-article{width:100%;max-width:1600px;margin-inline:auto;font-size:18px}.lesson-article .lesson-prose{font-size:inherit}.chapter-heading h2{font-size:2.5rem}.exercise-item>.lesson-prose{font-size:1.25rem}.exercise-hint,.preview-intro,.lesson-article .preview-heading{font-size:1rem}.vocabulary-card h3{font-size:1.8rem}.lesson-goal{max-width:75ch;font-size:1.2rem}.exercise-options.options-four,.exercise-options{grid-template-columns:repeat(2,minmax(0,1fr))}}@media (width>=1400px){.exercise-options.options-four{grid-template-columns:repeat(4,minmax(0,1fr))}}@media (width<=850px){.desktop-sections-bar{display:none}.lesson-layout,.lesson-layout.sidebar-open{width:calc(100% - 2rem);display:block}.teacher-class-tools{padding:.75rem 1rem}}@media (width<=560px){.lesson-layout{width:calc(100% - 1.4rem)}.starting-notes{grid-template-columns:1fr}.teacher-sidecar{width:calc(100% - 1.4rem)}.teacher-sidecar section{padding:1rem}.exercise-options{grid-template-columns:1fr}}@media (width>=561px) and (width<=850px){.exercise-options{grid-template-columns:repeat(2,minmax(0,1fr))}}.exercise-options label{transition:background-color .18s,border-color .18s,box-shadow .18s,transform .18s}.exercise-options label:hover:has(input:enabled){transform:translateY(-2px);box-shadow:0 3px 10px #315d721f}.exercise-options .option-selected{background:#d9ecf8;border:3px solid #336b91;padding:calc(1rem - 2px);animation:.26s ease-out option-select;box-shadow:0 0 0 3px #336b9124}.option-selected .option-mark{color:#fff;background:#336b91;border-radius:50%;flex:0 0 26px;place-items:center;width:26px;height:26px;animation:.28s ease-out selection-check;display:grid}.exercise-options .option-correct{background:#dff0e3;border-color:#487654;box-shadow:0 0 0 3px #4876541f}.exercise-options .option-wrong{background:#f6e3df;border-color:#a45b51;box-shadow:0 0 0 3px #a45b511f}.option-correct .option-mark{color:#fff;background:#487654}.option-wrong .option-mark{color:#fff;background:#a45b51}.exercise-options .option-correct .option-mark,.exercise-options .option-wrong .option-mark{border-radius:50%;flex:0 0 26px;place-items:center;width:26px;height:26px;display:grid}.exercise-feedback{animation:.26s ease-out disclosure-appear}.chapter-heading{padding-right:115px;position:relative}.chapter-toggle{color:#355b42;min-height:44px;font:inherit;cursor:pointer;background:#f5f8f6;border:1px solid #c6d2cd;border-radius:8px;align-items:center;gap:.4rem;padding:.5rem .7rem;font-size:.85rem;display:flex;position:absolute;top:1.5rem;right:0}.chapter-toggle span{font-size:1.25rem}.chapter-body[hidden]{display:none}.chapter-body:not([hidden]){animation:.16s ease-out disclosure-appear}.vocabulary-card .vocabulary-field{margin-top:.75rem;display:block}.vocabulary-field dd{margin:.35rem 0 0}.vocabulary-spoiler{color:#40584a;width:100%;min-height:44px;font:inherit;text-align:left;cursor:pointer;overflow-wrap:anywhere;background:#edf2ef;border:1px solid #d3ddd6;border-radius:8px;padding:.65rem .8rem;transition:background-color .16s;position:relative;overflow:hidden}.vocabulary-spoiler>span:first-child{z-index:1;position:relative}.spoiler-mask{opacity:.35;filter:blur(5px);background:repeating-linear-gradient(0deg,#82978b 0 3px,#0000 3px 8px);position:absolute;inset:10px 16px 10px 90px}.vocabulary-spoiler.is-revealed{color:#26372b;background:#fff;animation:.16s ease-out disclosure-appear}.exercise-actions{flex-wrap:wrap;align-items:center;gap:.75rem;display:flex}.exercise-actions .transcript-panel{flex-basis:100%}.exercise-correct.exercise-just-checked{animation:.36s ease-out answer-success}.exercise-wrong.exercise-just-checked{animation:.32s ease-out answer-wrong}.exercise-correct input[type=text],.exercise-correct .order-sequence{border-color:#487654}.exercise-wrong input[type=text],.exercise-wrong .order-sequence{border-color:#a45b51}@keyframes answer-success{0%{box-shadow:0 0 #48765459}45%{box-shadow:0 0 0 5px #4876542e}to{box-shadow:0 0 #0000}}@keyframes answer-wrong{0%,to{transform:translate(0)}25%,65%{transform:translate(-4px)}45%,85%{transform:translate(4px)}}.grammar-group details[open]>.lesson-prose,.grammar-group details[open]>.grammar-examples{animation:.24s ease-out disclosure-appear}@keyframes option-select{0%{transform:scale(.975)}60%{transform:scale(1.01)}to{transform:scale(1)}}@keyframes selection-check{0%{opacity:0;transform:scale(.5)}65%{transform:scale(1.16)}to{opacity:1;transform:scale(1)}}@keyframes disclosure-appear{0%{opacity:0;transform:translateY(5px)}to{opacity:1;transform:translateY(0)}}@media (prefers-reduced-motion:reduce){.lesson-layout,.lesson-layout *,.lesson-layout :before,.lesson-layout :after{transition:none!important;animation:none!important}}