:root{font-family:Arial,'Segoe UI',sans-serif;color:#172438;background:#f7f9fe;font-size:16px;line-height:1.65;--blue:#3154d6;--muted:#65758d;--line:#dfe5f0}*{box-sizing:border-box}body{margin:0}a{color:inherit;text-decoration:none}button,input{font:inherit}button,a{touch-action:manipulation}button{cursor:pointer}button:disabled{cursor:wait;opacity:.6}a:focus-visible,button:focus-visible,input:focus-visible,summary:focus-visible{outline:3px solid #ee9b31;outline-offset:4px}header{display:flex;gap:35px;align-items:center;padding:20px max(24px,calc((100vw - 1200px)/2));background:#fff;border-bottom:1px solid var(--line)}.brand{display:flex;align-items:center;gap:11px;white-space:nowrap;font-size:21px;letter-spacing:-.6px}.brand b{color:var(--blue)}.logo{background:var(--blue);color:#fff;display:grid;place-items:center;border-radius:11px;width:40px;height:42px;font-size:28px;font-weight:800}nav{display:flex;gap:27px}nav a{font-size:14px;font-weight:600;padding:9px 0;border-bottom:2px solid transparent}nav a.active{color:var(--blue);border-color:var(--blue)}.header-label{margin-left:auto;font-size:12px;color:var(--muted)}main{max-width:1200px;padding:33px 24px 0;margin:auto;min-height:75vh}#content:focus{outline:none}h1,h2,h3,p{margin-top:0}h1{font-size:34px;line-height:1.25;letter-spacing:-1px;margin-bottom:12px}h2{font-size:22px;letter-spacing:-.4px;line-height:1.4}h3{font-size:18px;line-height:1.45}.eyebrow{font-size:12px;font-weight:700;letter-spacing:1.8px;color:var(--blue);margin-bottom:12px}.muted{color:var(--muted)}.page-intro{margin-bottom:27px}.page-intro p{max-width:650px;margin-bottom:0}.split{display:grid;grid-template-columns:235px minmax(0,1fr);gap:30px}.levels{display:grid;gap:8px;align-content:start}.level-button{display:flex;align-items:center;gap:12px;text-align:left;background:transparent;border:1px solid transparent;border-radius:10px;padding:13px;color:#354963;width:100%}.level-button.active{background:#fff;border-color:#bfcefc;box-shadow:0 3px 12px #21377306}.level-button:hover{background:#edf2ff}.level-number{background:#e9effd;color:var(--blue);font-weight:bold;width:38px;height:39px;border-radius:8px;display:grid;place-items:center;flex:none}.level-button.active .level-number{background:var(--blue);color:#fff}.level-button strong{font-size:14px;display:block}.level-button small{display:block;font-size:12px;color:var(--muted)}.panel{background:#fff;border:1px solid var(--line);border-radius:14px;padding:28px}.level-top{display:flex;justify-content:space-between;gap:20px;border-bottom:1px solid var(--line);padding-bottom:22px;margin-bottom:20px}.level-top h2{margin:0 0 4px}.level-top p{margin:0;color:var(--muted);font-size:14px}.pill{display:inline-block;border:1px solid #d6e1ff;background:#f1f5ff;color:#3154bd;border-radius:30px;padding:5px 12px;font-size:12px;white-space:nowrap;height:fit-content}.lesson-row{display:flex;align-items:center;gap:17px;padding:23px 0;border-bottom:1px solid #e9edf5}.lesson-row:last-of-type{border-bottom:0}.lesson-order{width:45px;height:45px;display:grid;place-items:center;border:1px solid var(--line);border-radius:50%;color:#8292ad;flex:none}.lesson-order.done{background:#e7f5ee;color:#19774e;border-color:#b9dfc9}.lesson-row h3{margin:0 0 4px}.lesson-row p{font-size:14px;color:var(--muted);margin:0}.lesson-row>a{margin-left:auto;flex:none}.btn{display:inline-flex;justify-content:center;align-items:center;gap:10px;border:1px solid var(--line);background:white;color:#263c5c;border-radius:8px;padding:10px 17px;font-size:14px;font-weight:600;min-height:44px}.btn:hover{background:#f0f4ff}.btn.primary{background:var(--blue);border-color:var(--blue);color:white}.btn.primary:hover{background:#2445bc}.btn.small{padding:7px 13px;min-height:38px}.practice-banner{background:#edf2ff;border-radius:10px;padding:20px 22px;display:flex;align-items:center;justify-content:space-between;gap:18px;margin-top:22px}.practice-banner p{margin:2px 0 0;font-size:14px;color:var(--muted)}.subnote{font-size:13px;color:var(--muted);padding:20px 5px}.progress-line{height:6px;border-radius:8px;background:#e7ecf7;overflow:hidden;margin-top:15px}.progress-line span{display:block;height:100%;background:var(--blue)}.study-layout{display:grid;grid-template-columns:minmax(0,1fr) 260px;gap:30px}.back{display:inline-block;color:var(--blue);font-size:14px;margin-bottom:23px}.lesson-content section{margin-top:30px}.lesson-content p{color:#435672}.lesson-content h2{font-size:20px}.vocab{display:grid;grid-template-columns:1fr 1fr;gap:10px}.word{border:1px solid var(--line);padding:15px 18px;border-radius:9px}.word strong{display:block;font-size:23px;letter-spacing:.5px;margin-bottom:3px}.word span{font-size:14px;color:var(--muted)}.example{background:#f4f7fd;border-left:3px solid #89a1f1;padding:16px 18px;margin:13px 0}.example strong{font-size:20px;font-weight:500}.example p{margin:7px 0 0;font-size:14px}.tip{background:#ecf6f7;border-radius:10px;padding:20px;margin-top:25px;font-size:14px}.tip strong{color:#167684}.tip p{margin:7px 0 0}.sidebar{align-self:start;position:sticky;top:25px}.sidebar h3{margin-bottom:14px}.sidebar a{display:block;font-size:14px;border-top:1px solid var(--line);padding:14px 0;color:var(--muted)}.sidebar a.active{color:var(--blue);font-weight:bold}.sidebar .btn{display:flex;color:#fff;margin-top:16px}.save-row{display:flex;gap:15px;align-items:center;flex-wrap:wrap;border-top:1px solid var(--line);margin-top:30px;padding-top:25px}.saved{font-size:14px;color:#19774e}.cards{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:20px}.quiz-card{display:flex;flex-direction:column;align-items:flex-start;gap:13px}.quiz-card .level-number{width:45px;height:46px}.quiz-card h2{font-size:19px;margin:0}.quiz-card p{color:var(--muted);font-size:14px;margin:0}.quiz-card .btn{margin-top:auto}.quiz-head{display:flex;justify-content:space-between;gap:20px;align-items:center;margin-bottom:25px}.quiz-shell{max-width:850px;margin:auto}.quiz-question{border:0;padding:0;margin:0 0 28px;min-width:0}.quiz-question legend{font-size:22px;font-weight:bold;line-height:1.5;margin-bottom:20px}.answers{display:grid;gap:12px}.answer{display:flex;align-items:center;gap:14px;border:1px solid var(--line);border-radius:10px;padding:17px 19px;cursor:pointer}.answer:has(input:checked){background:#eff3ff;border-color:var(--blue)}.answer input{accent-color:var(--blue);width:19px;height:19px;flex:none}.quiz-actions{display:flex;justify-content:space-between;gap:14px;padding-top:23px;border-top:1px solid var(--line)}.question-dots{display:flex;gap:9px;flex-wrap:wrap;margin:20px 0}.question-dots button{background:#fff;border:1px solid var(--line);border-radius:8px;width:39px;height:39px;color:var(--muted)}.question-dots button.answered{background:#eaf0ff;color:var(--blue)}.question-dots button.current{border:2px solid var(--blue);font-weight:bold}.feedback-error{color:#b02d3e;background:#fff0f2;padding:12px 16px;border-radius:8px;font-size:14px;margin:13px 0}.loading,.empty{text-align:center;padding:60px 20px;color:var(--muted)}.stats{display:grid;grid-template-columns:repeat(3,1fr);gap:18px;margin-bottom:27px}.stat strong{display:block;font-size:34px;line-height:1.25;color:var(--blue);margin-bottom:7px}.stat span{color:var(--muted);font-size:14px}.history{width:100%;border-collapse:collapse;text-align:left}.table-wrap{overflow-x:auto}.history th,.history td{padding:14px 12px;border-bottom:1px solid var(--line);font-size:14px;white-space:nowrap}.history th{color:var(--muted);font-weight:500}.history a{color:var(--blue);font-weight:bold}.progress-courses{display:grid;grid-template-columns:1fr 1fr;gap:18px;margin:25px 0}.progress-courses h3{margin:0 0 6px}.progress-courses p{font-size:14px;color:var(--muted);margin:0}.result-heading{text-align:center;padding:10px 0 25px}.score{display:inline-grid;place-items:center;border:8px solid #dfe7ff;color:var(--blue);border-radius:50%;width:125px;height:125px;font-size:35px;font-weight:bold;margin:20px}.result-heading h1{font-size:28px}.result-heading p{color:var(--muted)}.review{border:1px solid var(--line);border-left:4px solid #ca5561;border-radius:9px;padding:20px;margin:15px 0}.review.correct{border-left-color:#22926a}.review h3{font-size:17px;margin:8px 0}.review p{font-size:14px;margin:6px 0;color:#536780}.review .status{font-size:12px;font-weight:bold;color:#b03244}.review.correct .status{color:#19774e}.review .explanation{padding-top:10px;border-top:1px solid var(--line);margin-top:12px}.result-actions{display:flex;justify-content:center;gap:14px;flex-wrap:wrap}.notification{background:#ecf5ff;border:1px solid #cadcf5;border-radius:8px;padding:14px 18px;margin-bottom:23px;font-size:14px}.notification .btn{margin-left:12px}.notice-error{background:#fff4ee;border-color:#f1d1b9}.skip{position:absolute;top:-100px;left:15px;padding:10px;background:#fff;z-index:10}.skip:focus{top:5px}footer{max-width:1152px;margin:60px auto 0;padding:25px 0;border-top:1px solid var(--line);display:flex;gap:25px;justify-content:space-between;align-items:center;font-size:12px;color:var(--muted)}footer strong{color:#3a4f6e;font-size:14px}footer a{color:var(--blue)}@media(max-width:1000px){.header-label{display:none}.cards{grid-template-columns:1fr 1fr}.split{grid-template-columns:200px minmax(0,1fr);gap:20px}.study-layout{grid-template-columns:minmax(0,1fr) 220px;gap:20px}footer{margin:45px 24px 0}}@media(max-width:720px){header{flex-wrap:wrap;gap:15px;padding:18px 20px}nav{width:100%;gap:22px;overflow-x:auto}nav a{white-space:nowrap}main{padding:25px 18px 0}h1{font-size:29px}.split,.study-layout{display:block}.levels{display:flex;overflow-x:auto;padding:0 0 15px;margin-bottom:10px;gap:8px}.level-button{width:auto;min-width:145px;padding:10px}.level-button small{display:none}.level-button strong{font-size:13px}.level-number{width:30px;height:33px}.panel{padding:20px}.level-top{flex-wrap:wrap;gap:10px}.lesson-row{flex-wrap:wrap;gap:12px}.lesson-row>div:nth-child(2){flex:1;min-width:160px}.lesson-row>a{margin-left:57px}.practice-banner{align-items:flex-start;flex-direction:column}.cards{grid-template-columns:1fr}.sidebar{position:static;margin-top:22px}.stats{gap:10px}.stat{padding:16px 10px}.stat strong{font-size:26px}.stat span{font-size:12px}.progress-courses{grid-template-columns:1fr}.quiz-head{flex-wrap:wrap;gap:10px}.quiz-question legend{font-size:19px}.vocab{gap:9px}.word{padding:13px}.word strong{font-size:20px}footer{flex-direction:column;align-items:flex-start;gap:10px}.history th,.history td{padding:12px 9px}.header-label{display:none}}@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important}}

.audio-actions{display:flex;gap:.5rem;flex-wrap:wrap;margin-top:.6rem}.vocab-practice{max-width:680px;margin:auto}.vocab-practice h2{font-size:2.5rem}.vocab-practice .answers{margin:1.5rem 0}.quiz-actions{flex-wrap:wrap}.quiz-card>.btn{margin-top:.5rem}