@import url('https://fonts.googleapis.com/css2?family=DM+Sans:wght@400;500;600;700&family=Manrope:wght@400;500;600;700;800&display=swap');
:root{font-family:'DM Sans',system-ui,sans-serif;color:#243b36;background:#f6f8f7;font-synthesis:none;--green:#183b36;--line:#dfe7e3;--muted:#667871;--yellow:#f0c44c}*{box-sizing:border-box}body{margin:0}button,input,select{font:inherit}button,a{-webkit-tap-highlight-color:transparent}button{cursor:pointer}button:focus-visible,a:focus-visible,input:focus-visible{outline:3px solid #c58c07;outline-offset:4px}header{height:100px;background:white;border-bottom:1px solid var(--line);display:flex;align-items:center;justify-content:space-between;padding:0 42px;gap:30px}.brand{display:flex;align-items:center;gap:12px;text-decoration:none;color:var(--green);font-family:Manrope,system-ui;font-weight:800;font-size:22px}.brand small{display:block;font:600 10px 'DM Sans',sans-serif;letter-spacing:1.7px;margin-top:7px}.logo{background:var(--green);color:white;width:46px;height:46px;border-radius:12px;font:32px Georgia;display:grid;place-items:center;position:relative}.logo span{position:absolute;right:7px;top:8px;background:var(--yellow);width:6px;height:6px;border-radius:50%}nav{display:flex;gap:8px}nav button{border:0;background:none;color:var(--muted);padding:12px 18px;border-radius:9px;font-weight:600}nav button.active{background:#eaf0ed;color:var(--green)}.level{font-size:14px;white-space:nowrap}.level i{font-style:normal;background:#f7efcf;padding:6px 9px;margin-left:10px;border-radius:6px;font-weight:700}.layout{display:grid;grid-template-columns:288px 1fr;max-width:1600px;margin:auto}aside{border-right:1px solid var(--line);padding:30px 22px;background:#fff;min-height:calc(100vh - 100px)}.path-label{font-size:12px;letter-spacing:1.4px;font-weight:700;display:flex;justify-content:space-between}.path-label span{letter-spacing:0;color:var(--muted)}.track{height:5px;background:#e8eeea;border-radius:5px;margin:16px 0 28px;overflow:hidden}.track div{height:100%;background:var(--green);transition:width .3s}.group{font-size:11px;letter-spacing:1.5px;color:#7b8983;font-weight:700;margin:26px 10px 12px}.chapter{border:0;width:100%;display:flex;align-items:center;gap:12px;text-align:left;background:none;color:#62756b;padding:11px 10px;border-radius:9px;margin:3px 0}.chapter.active{background:#e8f0eb;color:#173c32}.number{width:27px;height:27px;flex-shrink:0;border:1px solid #d9e3dd;border-radius:50%;display:grid;place-items:center;font-size:12px}.active .number{background:var(--green);border-color:var(--green);color:white}.chapter .name{font-size:14px;line-height:1.35}.chapter.done .number{background:#dcf0df;color:#285f31}.local-note{font-size:12px;color:var(--muted);margin:28px 10px}main{padding:35px 50px 65px;min-width:0;max-width:1190px;width:100%;margin:auto}.eyebrow{font-size:12px;font-weight:700;letter-spacing:1.6px;color:var(--muted);margin-bottom:12px}.intro{display:flex;justify-content:space-between;align-items:start;gap:20px}h1,h2,h3{font-family:Manrope,system-ui;letter-spacing:-.7px}h1{font-size:36px;line-height:1.2;margin:0 0 12px;font-weight:800}p{line-height:1.65}p.sub{color:var(--muted);margin:0 0 25px;max-width:620px}.time{white-space:nowrap;font-size:13px;color:var(--muted);padding-top:8px}.lesson-nav{display:flex;border-bottom:1px solid var(--line);margin-bottom:25px;gap:28px}.lesson-nav button{border:0;border-bottom:3px solid transparent;padding:10px 0 15px;background:none;color:var(--muted);font-size:14px}.lesson-nav button.selected{color:var(--green);border-bottom-color:var(--green);font-weight:700}.lesson-nav span{font-size:12px;margin-right:6px}.feature{background:var(--green);color:white;padding:30px 32px;border-radius:16px;position:relative}.feature .eyebrow{color:#b1cdc1}.phrase{font-size:32px;line-height:1.4;margin:15px 0 5px;font-family:Manrope,system-ui;font-weight:600}.translation{color:#b9d0c5;margin:0;font-size:17px}.feature button{background:#31514b;border:1px solid #4c6c5e;color:white;border-radius:8px;padding:8px 13px;font-size:13px;float:right}.section-head{display:flex;align-items:baseline;justify-content:space-between;margin-top:28px;gap:12px}.section-head h2{font-size:20px;margin:0 0 16px}.section-head span{font-size:13px;color:var(--muted)}.tokens{display:flex;flex-wrap:wrap;gap:10px}.token{padding:15px 20px;background:white;border:1px solid var(--line);border-radius:10px;min-width:110px}.token strong{display:block;font-size:20px}.token small{display:block;color:var(--muted);font-size:14px;margin-top:6px}.tip{border-left:3px solid var(--yellow);background:#fcf8e9;padding:16px 20px;margin:24px 0;border-radius:0 8px 8px 0}.tip strong{font-size:14px}.tip p{font-size:15px;margin:6px 0 0}.bottom{display:flex;align-items:center;justify-content:space-between;gap:15px;margin-top:26px}.muted{font-size:14px;color:var(--muted)}.primary{border:0;background:var(--green);color:white;border-radius:9px;padding:14px 22px;font-weight:600;font-size:15px}.primary:hover{background:#28594c}.secondary{background:white;border:1px solid #ccd9d1;border-radius:8px;color:var(--green);padding:11px 16px}.grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px}.word{border:1px solid var(--line);border-radius:12px;background:white;padding:22px;text-align:left;color:var(--green);min-height:128px}.word strong{font-size:23px;display:block;margin:5px 0 12px}.word small{color:var(--muted);font-size:14px}.word.revealed{background:#eaf2ed}.card{border:1px solid var(--line);background:white;border-radius:14px;padding:26px;margin:20px 0}.card h2{font-size:24px;margin:0 0 14px}.options{display:grid;gap:11px}.option{display:flex;align-items:center;gap:14px;border:1px solid var(--line);background:white;padding:16px;border-radius:10px;text-align:left;color:var(--green)}.option b{font-size:13px;border:1px solid var(--line);border-radius:6px;padding:5px 9px}.option.correct{background:#e0f1e4;border-color:#5d986c}.option.wrong{background:#ffedeb;border-color:#cd7c6f}.option:disabled{cursor:default;color:var(--green);opacity:1}.feedback{padding:17px;border-radius:9px;background:#edf4ef;margin-top:15px;line-height:1.6}.feedback.error{background:#fff1e8}.score{font-size:54px;font-weight:800;color:var(--green)}.review-word{display:grid;grid-template-columns:1fr 1fr auto;padding:15px 0;border-bottom:1px solid var(--line);gap:15px;align-items:center}.review-word button{padding:7px 12px}.search{width:100%;padding:13px 16px;border:1px solid #cbd7cf;border-radius:9px;background:white;margin:5px 0 20px}.stats{display:flex;gap:14px;flex-wrap:wrap;margin-bottom:25px}.stat{background:#fff;border:1px solid var(--line);padding:18px 23px;border-radius:10px}.stat b{display:block;font-size:26px;margin-bottom:4px}.stat span{font-size:13px;color:var(--muted)}a{color:#236959}li{line-height:1.7;margin-bottom:8px}.sr-only,.skip:not(:focus){position:absolute;width:1px;height:1px;padding:0;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap}.skip:focus{position:absolute;top:10px;left:10px;z-index:10;background:white;padding:15px}button{transition:background .15s}button:hover:not(:disabled){filter:brightness(.97)}.chapter:hover{background:#f0f5f2}.completed{background:#eff5ef;border:1px solid #bfd4c3;border-radius:12px;padding:25px}.empty{padding:25px;background:white;border-radius:10px}details{border-bottom:1px solid var(--line);padding:16px 0}summary{cursor:pointer;font-weight:600}footer{margin-top:30px;color:var(--muted);font-size:12px}
@media(min-width:1500px){main{padding-top:45px}}@media(max-width:1100px){header{padding:0 24px}.level{display:none}.layout{grid-template-columns:248px 1fr}main{padding:30px}.phrase{font-size:28px}}@media(max-width:760px){header{height:auto;min-height:110px;flex-wrap:wrap;padding:18px 20px 8px;gap:15px}.brand{font-size:20px}.brand small{font-size:9px}nav{width:100%;justify-content:space-between;gap:0}nav button{padding:10px 12px;font-size:14px}.layout{display:block}aside{min-height:0;padding:20px;border-right:0;border-bottom:1px solid var(--line)}.path-label{font-size:11px}.track{margin:12px 0 15px}#chapters{display:flex;gap:5px;overflow:auto;padding-bottom:4px}.group{display:none}.chapter{width:auto;flex-shrink:0;margin:0;padding:8px}.chapter .name{max-width:120px}.chapter:not(.active) .name{display:none}.local-note{display:none}main{padding:27px 20px 45px}h1{font-size:28px}.time{display:none}.feature{padding:25px 22px}.phrase{font-size:26px}.feature button{float:none;margin-bottom:14px}.grid{gap:10px}.word{padding:17px}.word strong{font-size:20px}.token{min-width:90px;padding:12px 15px}.bottom{align-items:stretch;flex-direction:column}.bottom .primary{text-align:center}.lesson-nav{gap:22px}.intro p{font-size:15px}.card{padding:22px}.review-word{grid-template-columns:1fr 1fr}.review-word button{grid-column:2}.section-head span{display:none}}@media(prefers-reduced-motion:reduce){*{transition:none!important;scroll-behavior:auto!important}}
/* Detailed learning and persistence states */
.chapter .name small{display:block;font-size:11px;color:var(--muted);margin-top:5px;line-height:1.45}.compact{padding:20px}.card .secondary+.primary,.card .primary+.secondary{margin-left:10px}textarea{width:100%;min-height:130px;font:inherit;line-height:1.6;padding:15px;border:1px solid #cbd7cf;border-radius:10px;resize:vertical;margin:10px 0 15px}.check-row{display:flex;align-items:start;gap:10px;font-size:16px;margin:15px 0}.check-row input{width:20px;height:20px;flex-shrink:0;accent-color:var(--green)}.sentence-work{display:flex;gap:8px;flex-wrap:wrap;min-height:85px;padding:18px;background:#f0f5f2;border:1px dashed #a6bdb0;border-radius:10px;align-items:center}.token-button{background:white;color:var(--green);border:1px solid #a9bcb1;border-radius:7px;padding:10px 14px;font:inherit}.word-bank{display:flex;gap:8px;flex-wrap:wrap;margin:20px 0}.hint-row{margin-top:24px;font-size:15px}.hint-row p{background:#fbf6e5;padding:15px;border-radius:9px}.exercise-dots{display:flex;gap:5px;flex-wrap:wrap;margin:10px 0 20px}.exercise-dots span{width:23px;height:25px;background:#e9eeeb;display:grid;place-items:center;border-radius:5px;color:#61776b}.exercise-dots .complete{background:#d6eadb;color:#285a38}.exercise-dots .attempted{background:#faebc7;color:#7b5715}.save-error{background:#fff0df;color:#6e4013;position:sticky;top:0;z-index:20;padding:12px 24px;font-size:15px;display:flex;align-items:center;justify-content:center;gap:20px}.save-error .secondary{white-space:nowrap}button:disabled{cursor:default;opacity:.55}.option:disabled{opacity:1}.progress-list .track{margin:12px 0}.progress-list .section-head{margin-top:0}.progress-list h2{font-size:19px}.progress-list strong{white-space:nowrap}#save-status{font-size:12px;color:var(--muted);max-width:170px;white-space:normal}.chapter .name{min-width:0}.primary:disabled:hover{background:var(--green)}#answer-form label{display:block;margin-bottom:10px}.reflection-error{color:#994b30}
@media(max-width:1000px){header{gap:18px}nav{gap:0}nav button{padding:11px 12px}}@media(max-width:760px){nav{overflow-x:auto;justify-content:start;gap:3px}nav button{padding:10px;white-space:nowrap;font-size:13px}#save-status{display:block;max-width:none;width:100%;font-size:12px}header{gap:9px}.chapter .name small{font-size:11px}.save-error{font-size:14px;padding:10px;flex-wrap:wrap;gap:8px}.card .primary+.secondary{margin:12px 0 0}.progress-list .section-head{align-items:start}.progress-list .section-head strong{font-size:15px}}
/* Connected, long-form theory lessons */
.theory-goal{margin:0 0 16px;max-width:72ch;font-size:17px}.theory-goal strong{display:block;color:var(--muted);font-size:12px;letter-spacing:1.2px;text-transform:uppercase;margin-bottom:6px}.theory-nav{display:flex;flex-wrap:wrap;gap:8px 18px;border-block:1px solid var(--line);padding:13px 0;margin-bottom:26px}.theory-nav a{font-size:14px;text-decoration:none;line-height:1.5}.theory-nav a:hover{text-decoration:underline}.theory-section{margin:40px 0;scroll-margin-top:24px}.theory-section h2,.theory-application h2{font-size:25px;line-height:1.35;margin:0 0 17px}.theory-section>p,.theory-application p{max-width:74ch;font-size:16px;line-height:1.85;margin:14px 0}.theory-concepts{scroll-margin-top:24px}.theory-table-wrap{overflow-x:auto;border:1px solid var(--line);border-radius:11px;background:white}.theory-table{border-collapse:collapse;width:100%;text-align:left;font-size:15px;line-height:1.55}.theory-table caption{text-align:left;padding:14px 16px;background:#e9f0eb;color:var(--green);font-weight:600}.theory-table th,.theory-table td{padding:14px 16px;vertical-align:top;border-top:1px solid var(--line)}.theory-table thead th{font-size:13px;color:var(--muted);font-weight:600}.theory-table tbody th{font-weight:600;width:29%}.theory-example{display:grid;grid-template-columns:35px minmax(0,1fr);gap:15px;border-top:1px solid var(--line);padding:24px 0}.example-index{font-size:13px;font-weight:700;color:#698677;padding-top:5px}.theory-example h3{font-size:21px;line-height:1.55;margin:0;font-weight:650;letter-spacing:0}.example-translation{font-size:16px;color:var(--muted);margin:5px 0 13px}.example-reason{font-size:16px;line-height:1.8;max-width:70ch;margin:0 0 13px}.theory-example .secondary{font-size:13px;padding:7px 12px}.theory-trap{background:#fcf7e6;border:0;border-left:3px solid var(--yellow);border-radius:0 10px 10px 0;min-height:0;padding:23px 25px;margin:30px 0}.theory-trap p{font-size:16px;line-height:1.75;margin:10px 0}.theory-trap .trap-first{color:#846528;font-style:italic}.theory-links{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px}.theory-link{padding:20px 17px;text-align:left;border:1px solid var(--line);border-radius:10px;background:white;color:var(--green);font:inherit;min-width:0}.theory-link span{display:block;font-size:11px;letter-spacing:1px;color:var(--muted);margin-bottom:8px}.theory-link strong{font-size:16px;line-height:1.5;display:block}.theory-link p{font-size:14px;line-height:1.65;margin:10px 0 0;color:var(--muted)}.theory-application{background:#eaf1ed;border-radius:12px;padding:25px;margin:35px 0}.theory-application h2{font-size:21px}.theory-application p{margin-bottom:0}.theory-check summary{line-height:1.6;padding:5px 0;font-size:16px}.theory-check summary span{display:block;font-size:12px;font-weight:400;color:var(--muted);margin-top:6px}.theory-check p{padding:12px 17px;background:white;border-left:2px solid #aac5b4;font-size:16px;line-height:1.8}.theory-references{display:flex;flex-wrap:wrap;gap:8px 18px;font-size:13px;color:var(--muted);line-height:1.6;border-top:1px solid var(--line);padding-top:18px;margin-top:30px}.theory-references>span{width:100%;font-size:12px}.theory-references a{font-size:13px}.theory-nav a:focus-visible{outline-offset:4px}.theory-section:target,.theory-concepts:target{scroll-margin-top:25px}
@media(max-width:1000px){.theory-links{grid-template-columns:1fr}.theory-link{padding:17px 20px}.theory-table td,.theory-table th{padding:12px}}@media(max-width:760px){.theory-goal{font-size:16px}.theory-section{margin:31px 0}.theory-section h2{font-size:22px}.theory-example{grid-template-columns:25px minmax(0,1fr);gap:9px}.theory-example h3{font-size:19px}.theory-table{font-size:14px;min-width:390px}.theory-trap,.theory-application{padding:20px}.theory-nav{gap:10px 17px}.theory-nav a{font-size:13px}.theory-example .secondary{font-size:14px}}