.lesson-screen{min-height:100vh;background:#f5f3ed;color:#242925}.lesson-topbar{height:64px;display:grid;grid-template-columns:1fr auto 1fr;align-items:center;padding:0 24px;border-bottom:1px solid #dedbd2;background:rgba(250,249,245,.92);backdrop-filter:blur(14px);position:sticky;top:0;z-index:20}.lesson-back{justify-self:start;border:0;background:transparent;display:inline-flex;align-items:center;gap:8px;color:#555d57;font-weight:650;padding:9px 10px;border-radius:10px}.lesson-back:hover{background:#eceae3}.lesson-brand{display:flex;align-items:center;gap:9px;font-weight:760}.lesson-brand-mark{width:30px;height:30px;border-radius:10px;background:#1e2823;color:#fff;display:grid;place-items:center}.lesson-mini-progress{justify-self:end;width:130px;display:flex;align-items:center;gap:9px;color:#747b75;font-size:11px}.lesson-mini-progress>div{height:5px;flex:1;background:#dfddd6;border-radius:999px;overflow:hidden}.lesson-mini-progress i{display:block;height:100%;width:0;background:#326a63;border-radius:999px;transition:width .35s ease}.lesson-main{width:min(760px,calc(100% - 28px));margin:0 auto;padding:48px 0 90px}.lesson-intro{margin-bottom:24px;animation:lessonEnter .35s ease both}.lesson-intro>span,.lesson-loading>span,.lesson-finish>span{font-size:10px;font-weight:750;text-transform:uppercase;letter-spacing:.09em;color:#326a63}.lesson-intro h1,.lesson-loading h1,.lesson-finish h1{font-size:32px;line-height:1.08;letter-spacing:-.035em;margin:7px 0 9px}.lesson-intro p,.lesson-loading p,.lesson-finish p{color:#727872;line-height:1.55;margin:0;max-width:620px}.activity-card{border:1px solid #dcd9d0;background:#fff;border-radius:22px;padding:28px;box-shadow:0 18px 55px rgba(31,39,34,.06);animation:lessonEnter .35s .05s ease both}.activity-kicker{display:inline-flex;align-items:center;gap:7px;color:#326a63;font-size:11px;font-weight:760;text-transform:uppercase;letter-spacing:.07em;margin-bottom:15px}.activity-card h2{font-size:23px;line-height:1.25;letter-spacing:-.025em;margin:0 0 12px}.activity-explanation{font-size:15px;line-height:1.65;color:#555d57;margin:0 0 20px}.activity-examples{margin:18px 0 24px;padding:0;list-style:none;display:grid;gap:8px}.activity-examples li{padding:12px 14px;background:#f6f5f1;border:1px solid #e6e3da;border-radius:12px;line-height:1.45}.activity-primary{border:0;background:#1e2823;color:#fff;height:44px;padding:0 17px;border-radius:12px;font-weight:720;display:inline-flex;align-items:center;justify-content:center;gap:8px;margin-top:8px}.activity-primary:disabled{opacity:.55}.choice-list{display:grid;gap:10px;margin:22px 0 16px}.choice-option{width:100%;text-align:left;border:1px solid #d8d5cd;background:#fbfaf7;border-radius:14px;padding:13px 14px;display:flex;align-items:center;gap:11px;font-size:14px;color:#353b36}.choice-option span{width:27px;height:27px;border-radius:8px;background:#eceae4;display:grid;place-items:center;font-weight:750;font-size:11px}.choice-option.is-correct{border-color:#76a493;background:#f1f8f4}.choice-option.is-wrong{border-color:#c89c91;background:#fff5f2}.activity-feedback{margin:14px 0 6px;padding:13px 14px;border-radius:13px;display:grid;gap:5px;font-size:13px;line-height:1.5}.activity-feedback.is-success{background:#eef7f2;color:#315b4e}.activity-feedback.is-note{background:#f7f2ea;color:#6b5b47}.activity-feedback span{color:inherit;opacity:.86}.activity-hint{display:flex;align-items:flex-start;gap:8px;padding:11px 13px;border-radius:12px;background:#f6f3eb;color:#666252;font-size:13px;line-height:1.5}.activity-response{width:100%;min-height:130px;border:1px solid #d5d2c9;border-radius:14px;padding:14px;font:inherit;line-height:1.5;resize:vertical;outline:none;background:#fff}.activity-response:focus{border-color:#79a39b;box-shadow:0 0 0 3px rgba(50,106,99,.09)}.activity-response-actions{display:flex;justify-content:space-between;gap:10px;align-items:center;margin-top:10px}.activity-mic{height:44px;padding:0 14px;border-radius:12px;border:1px solid #d7d4cb;background:#fff;display:inline-flex;align-items:center;gap:8px;font-weight:680;color:#303731}.activity-mic.is-listening{border-color:#b6786c;background:#fff4f2;color:#8a4c43}.activity-mic.is-processing svg{animation:spin 1s linear infinite}.lesson-loading,.lesson-finish{text-align:center;display:flex;min-height:calc(100vh - 180px);flex-direction:column;align-items:center;justify-content:center}.lesson-loader,.finish-mark{width:62px;height:62px;border-radius:20px;background:#1e2823;color:#fff;display:grid;place-items:center;margin-bottom:17px}.lesson-loader{animation:lessonPulse 1.7s ease-in-out infinite}.lesson-finish .activity-primary{margin-top:24px}.finish-mark{background:#326a63;animation:lessonPop .35s ease both}@keyframes lessonEnter{from{opacity:0;transform:translateY(8px)}to{opacity:1;transform:none}}@keyframes lessonPulse{50%{transform:scale(1.05);box-shadow:0 0 0 10px rgba(50,106,99,.07)}}@keyframes lessonPop{from{transform:scale(.75);opacity:0}to{transform:scale(1);opacity:1}}@media(max-width:640px){.lesson-topbar{padding:0 12px;grid-template-columns:auto 1fr auto}.lesson-brand{justify-self:center}.lesson-brand span:last-child{display:none}.lesson-back span{display:none}.lesson-mini-progress{width:92px}.lesson-main{padding-top:28px}.lesson-intro h1,.lesson-loading h1,.lesson-finish h1{font-size:27px}.activity-card{padding:20px;border-radius:18px}.activity-card h2{font-size:20px}.activity-response-actions{align-items:stretch}.activity-mic{width:46px;padding:0;justify-content:center}.activity-mic span{display:none}.activity-primary{flex:1}}