:root{font-family:-apple-system,BlinkMacSystemFont,'Segoe UI',sans-serif;color:#263c39;background:#f5f3ed;font-size:16px;--teal:#176653;--muted:#687773;--line:#e1e6df}*{box-sizing:border-box}body{margin:0}button,select{font:inherit}button,a,select{-webkit-tap-highlight-color:transparent}button{cursor:pointer;touch-action:manipulation;border:1px solid var(--line);border-radius:12px;background:#fff;color:#263c39;min-height:46px;padding:10px 15px;font-weight:650}button:hover{background:#edf4ed}button:disabled{opacity:.55;cursor:default}button:focus-visible,a:focus-visible,select:focus-visible{outline:3px solid #bb6b24;outline-offset:3px}a{color:var(--teal)}[hidden]{display:none!important}.topbar{background:#fffefa;border-bottom:1px solid var(--line);padding:17px max(20px,calc((100% - 1260px)/2));display:flex;justify-content:space-between;align-items:center;gap:14px}.brand{font-weight:800;letter-spacing:-.5px;font-size:21px}.brand small{font-size:12px;letter-spacing:1.4px;color:var(--teal);display:block;margin-bottom:4px}.badge{border-radius:20px;background:#edf2e7;padding:7px 12px;font-size:12px;color:#4b6349;white-space:nowrap}.shell{max-width:1300px;margin:24px auto;display:grid;grid-template-columns:220px minmax(0,1fr);gap:28px;padding:0 20px}.sidebar{padding-top:10px}.eyebrow{font-size:12px;letter-spacing:1.4px;color:var(--teal);font-weight:800}.sidebar h2{font-size:18px;margin:7px 0 18px}#lessonMenu{display:grid;gap:7px}#lessonMenu button{text-align:left;background:transparent;border-color:transparent;padding:13px 12px;font-size:15px}#lessonMenu button small{display:block;font-weight:400;font-size:12px;color:var(--muted);margin:5px 0 0 28px}#lessonMenu button[aria-current=true]{background:#e0ecdf;color:#145642;border-color:#c7dcc7}.side-note{font-size:13px;line-height:1.8;margin:22px 10px;color:var(--muted)}main{min-width:0}.intro{display:flex;justify-content:space-between;gap:16px;align-items:center;margin-bottom:22px}h1{font-size:clamp(26px,3vw,36px);margin:8px 0 7px;letter-spacing:-.7px}.subtitle{margin:0;color:var(--muted);line-height:1.6}.section-tabs{display:flex;gap:6px;border-bottom:1px solid var(--line);margin-bottom:20px;overflow-x:auto}.section-tabs button{white-space:nowrap;border:0;border-radius:0;background:transparent;padding:14px 20px;color:var(--muted);border-bottom:3px solid transparent}.section-tabs button[aria-selected=true]{color:var(--teal);border-bottom-color:var(--teal)}.card{background:#fffefa;border:1px solid var(--line);border-radius:20px;overflow:hidden}.dialog-grid{display:grid;grid-template-columns:1.05fr 1fr}.scene-wrap{background:#e7eadd;display:flex;align-items:center;padding:16px}.scene-wrap .learning-picture{border-radius:13px}.dialog-body{padding:24px}h2{font-size:21px;margin:0 0 18px}.dialog-line{display:grid;grid-template-columns:28px 1fr 38px;gap:8px;padding:12px 0;border-bottom:1px solid var(--line)}.speaker{font-size:11px;background:#e5eee1;width:25px;height:25px;border-radius:50%;display:grid;place-items:center;color:var(--teal);font-weight:800}.dialog-line p{margin:0;font-size:16px;line-height:1.5}.dialog-line small{display:block;margin-top:5px;line-height:1.5;color:var(--muted);font-size:13px}.icon-btn{padding:0;border:0;background:transparent;min-height:42px}.toolbar{display:flex;gap:8px;flex-wrap:wrap;margin-top:17px}.primary{background:var(--teal);color:white;border-color:var(--teal)}.primary:hover{background:#104e40}.grammar-note{padding:17px 23px;margin-top:16px;border-radius:14px;background:#ebeeda;font-size:14px;line-height:1.8}.section-heading{display:flex;justify-content:space-between;align-items:center;gap:10px;margin:26px 0 16px}.section-heading h2{margin:0}.section-heading span{color:var(--muted);font-size:13px}.vocab-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:14px}.vocab-card{padding:0;border-radius:15px;overflow:hidden;text-align:left;background:#fffefa;min-width:0}.vocab-card .learning-picture{border-radius:0}.vocab-card .calendar-label{font-size:21px}.word-label{padding:12px;display:block}.word-label strong{display:block;font-size:16px;overflow-wrap:anywhere}.word-label small{display:block;font-size:13px;color:var(--muted);margin-top:5px;font-weight:400}.notice{font-size:13px;line-height:1.7;color:var(--muted)}#speechStatus{min-height:24px;color:#8b461b}#practicePanel,#speakingPanel{padding:26px}.mode-row{display:flex;align-items:center;flex-wrap:wrap;gap:12px;justify-content:space-between;margin-bottom:18px}select{padding:11px;border:1px solid var(--line);border-radius:10px;max-width:100%;background:#fffefa}.quiz-layout{display:grid;grid-template-columns:1.2fr 1fr;gap:22px;align-items:center}.answers{display:grid;gap:10px}.answers button{text-align:left;min-height:52px}.answers button.correct{background:#deefde;border-color:#45946c;color:#165238;opacity:1}.answers button.wrong{background:#fae9e1;border-color:#b46b4e;color:#7d351e;opacity:1}.quiz-feedback{min-height:54px;margin-top:18px;padding:14px;background:#f0f3e9;border-radius:12px;line-height:1.6}.progress-track{height:5px;background:#e9eade;border-radius:4px;margin:13px 0 22px}.progress-track span{display:block;height:100%;background:var(--teal);border-radius:4px;transition:width .2s}.quiz-listen{min-height:240px;display:grid;place-content:center;text-align:center;background:#e9efe4;border-radius:16px;padding:20px}.quiz-listen strong{font-size:38px;font-weight:400}.quiz-listen p{color:var(--muted)}#quizNext{margin-left:auto}.speaking-sentence{font-size:24px;line-height:1.6;margin:20px 0 8px}audio{width:100%;margin-top:18px}.footer{margin:25px 0;font-size:12px;line-height:1.9;color:var(--muted)}.results{padding:22px;text-align:center;background:#e7efe1;border-radius:14px}.results strong{font-size:48px;display:block;margin:15px}.link-row{display:flex;gap:15px;flex-wrap:wrap}.backup{margin-top:20px;padding-top:16px;border-top:1px solid var(--line)}
@media(max-width:1050px){.shell{grid-template-columns:190px minmax(0,1fr);gap:18px}.dialog-grid{grid-template-columns:1fr}.scene-wrap{padding:0}.scene-wrap .learning-picture{border-radius:0;max-height:360px}.vocab-grid{grid-template-columns:repeat(3,minmax(0,1fr))}}
@media(max-width:700px){.topbar{padding:14px 16px}.brand{font-size:18px}.shell{display:block;padding:0 14px;margin:15px auto}.sidebar{padding:0}.sidebar h2,.sidebar>.eyebrow,.side-note{display:none}#lessonMenu{display:flex;overflow-x:auto;gap:6px;padding-bottom:12px;margin-bottom:15px}#lessonMenu button{flex:0 0 auto;border:1px solid var(--line);background:#fffefa;min-height:44px;padding:10px}#lessonMenu button small{display:none}.intro{margin-bottom:17px}.intro .badge{display:none}h1{font-size:28px}.section-tabs{margin-bottom:15px}.section-tabs button{flex:1;padding:12px 8px;font-size:15px}.dialog-body{padding:18px}.dialog-line{grid-template-columns:25px 1fr 35px}.vocab-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:10px}.word-label{padding:11px}.vocab-card .calendar-label{font-size:20px}.quiz-layout{grid-template-columns:1fr;gap:16px}.answers{grid-template-columns:1fr 1fr}.answers button{font-size:15px;overflow-wrap:anywhere}.quiz-listen{min-height:180px}#practicePanel,#speakingPanel{padding:17px}.speaking-sentence{font-size:21px}.section-heading{margin-top:22px}.footer{margin-bottom:35px}}