:root{--ink:#153f38;--muted:#687671;--paper:#f6f7f3;--line:#dce3db;--accent:#edb66b;--white:#fff;--red:#9c3030}*{box-sizing:border-box}body{margin:0;font-family:system-ui,-apple-system,"Segoe UI",sans-serif;background:var(--paper);color:var(--ink);font-size:16px;line-height:1.65}button,input,textarea,select{font:inherit}button,a,input,textarea,select{-webkit-tap-highlight-color:transparent}button{cursor:pointer}button:disabled{cursor:wait;opacity:.55}button:focus-visible,a:focus-visible,input:focus-visible,textarea:focus-visible,select:focus-visible{outline:3px solid #c78324;outline-offset:3px}button{border:0}h1,h2,h3,p{margin-top:0}h1{font-size:clamp(1.8rem,3.1vw,2.6rem);line-height:1.2;letter-spacing:-.04em;font-weight:650}h2{font-size:1.7rem;line-height:1.3;letter-spacing:-.025em}h3{font-size:1.05rem}p{color:#465e56}.eyebrow{font-size:.7rem;font-weight:750;letter-spacing:.15em;display:block;margin-bottom:12px}.primary,.secondary,.link-button{min-height:46px;padding:11px 20px;border-radius:9px;font-weight:650;display:inline-flex;align-items:center;justify-content:center;gap:8px;text-decoration:none}.primary{background:var(--ink);color:white}.primary:hover{background:#24594c}.secondary{background:#e8ede5;color:var(--ink)}.text-button{background:transparent;color:var(--ink);min-height:44px;padding:8px 12px;text-decoration:underline;text-underline-offset:4px}.small{font-size:.81rem;color:var(--muted);margin:14px 0}.error{background:#fff0ed;color:var(--red)!important;border-radius:8px;padding:12px 16px}.auth-page{min-height:100dvh;display:grid;place-items:center;padding:24px;background:radial-gradient(ellipse at 0 0,#dfe9d8,transparent 65%),var(--paper)}.auth-card{width:min(100%,510px);padding:40px;border:1px solid var(--line);border-radius:18px;background:white;box-shadow:0 20px 80px #153f380b}.auth-card h1{margin:22px 0}.auth-card label,label{display:block;font-weight:600;font-size:.9rem;margin:12px 0}input,textarea,select{display:block;width:100%;padding:12px;border:1px solid #b9c7bd;border-radius:8px;background:white;color:var(--ink);min-height:46px;font-size:16px}textarea{resize:vertical}.auth-card .primary{width:100%;margin-top:15px}.check{font-size:.85rem;margin:6px 0}.topbar{display:flex;align-items:center;gap:24px;padding:20px 4vw;background:#fff;border-bottom:1px solid var(--line)}.brand{font-size:1.65rem;font-weight:800;letter-spacing:-.06em;text-decoration:none;color:var(--ink);line-height:1}.brand span{font-size:.65rem;letter-spacing:.04em;font-weight:450;display:block;margin-top:7px}.level{margin-left:auto;font-size:.7rem;letter-spacing:.09em;background:#edf1e8;border-radius:30px;padding:6px 12px;font-weight:700}.layout{display:grid;grid-template-columns:285px minmax(0,1fr);max-width:1500px;margin:auto;min-height:calc(100dvh - 95px)}.sidebar{padding:30px 20px 30px 25px;border-right:1px solid var(--line);background:#eef1e9}.sidebar h2{margin-bottom:26px}.sidebar h2 span{display:block;font-size:.85rem;font-weight:400;letter-spacing:0;margin-top:7px;color:var(--muted)}.lesson-link{display:flex;text-align:left;align-items:baseline;gap:10px;width:100%;background:transparent;color:#486155;border-radius:8px;padding:10px 12px;font-size:.8rem;min-height:44px;line-height:1.5;margin-bottom:4px}.lesson-link.selected{background:white;color:var(--ink);font-weight:650;box-shadow:0 2px 6px #153f3805}.lesson-number{font-size:.7rem;flex:0 0 24px;color:#718175}.done{margin-left:auto}.sidebar-note{font-size:.72rem;line-height:1.6;border-top:1px solid #d2dbcf;margin-top:25px;padding-top:20px;color:var(--muted)}.mobile-select{display:none}.workspace{padding:38px clamp(20px,4vw,65px);max-width:1100px;width:100%;min-width:0}.welcome{display:flex;justify-content:space-between;align-items:center;gap:20px}.welcome h1{margin-bottom:28px}.progress-pill{font-size:.78rem;white-space:nowrap;background:#e8ede1;border-radius:20px;padding:8px 13px}.stats{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;padding:16px 0 25px;border-bottom:1px solid var(--line);margin-bottom:25px}.stats div{display:flex;flex-direction:column}.stats strong{font-size:1.65rem;font-weight:550;line-height:1.3}.stats span{font-size:.77rem;color:var(--muted);margin-top:5px}.tabs{display:flex;gap:5px;flex-wrap:wrap;margin-bottom:16px}.tabs button{padding:10px 15px;min-height:44px;border-radius:25px;background:transparent;color:#607066;font-size:.85rem}.tabs .active{background:var(--ink);color:white}.panel{background:white;border:1px solid var(--line);border-radius:15px;padding:clamp(20px,3vw,36px)}.panel[hidden]{display:none}.panel h2{margin:4px 0 12px}.panel h3{margin:18px 0 10px}#notice:empty{display:none}#notice{margin:12px 0;overflow-wrap:anywhere}.examples{margin:25px 0;border-top:1px solid var(--line);border-bottom:1px solid var(--line)}.example-row{display:flex;align-items:center;justify-content:space-between;gap:15px;padding:13px 0}.example-row+.example-row{border-top:1px solid #edf1ea}.example-row p{margin:0;font-size:1.05rem}.listen{font-size:.75rem;min-width:48px;min-height:44px;background:#f0f3eb;color:var(--ink);border-radius:8px;padding:6px 10px}.actions{display:flex;gap:12px;flex-wrap:wrap}.quiz-options{display:grid;gap:10px;margin:20px 0}.quiz-option{text-align:left;border:1px solid var(--line);border-radius:10px;background:#fafbf8;padding:15px;color:var(--ink);min-height:50px}.quiz-option.correct{border-color:#2f8059;background:#e3f3e7}.quiz-option.incorrect{border-color:#aa5650;background:#fff0ee}.feedback{padding-top:20px;border-top:1px solid var(--line);margin-top:20px}.feedback p{margin:8px 0}.word{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr) auto;gap:15px;padding:14px 0;align-items:center;border-bottom:1px solid var(--line);font-size:.87rem;overflow-wrap:anywhere}.word .plural{display:block;font-size:.75rem;color:var(--muted)}.chat-heading{display:flex;justify-content:space-between;align-items:start;gap:10px}.chat-heading h2{font-size:1.5rem}#chat-history{max-height:55dvh;overflow-y:auto;overscroll-behavior:contain;margin:15px 0;display:flex;flex-direction:column;gap:14px}.message{max-width:95%;padding:14px 17px;background:#f1f4ed;border-radius:12px;white-space:pre-wrap;overflow-wrap:anywhere;font-size:.9rem}.message.user{align-self:flex-end;background:#e0ebdb}.message-label{display:block;font-size:.65rem;font-weight:700;letter-spacing:.08em;margin-bottom:5px}#chat-form button{margin-top:10px}footer{text-align:center;font-size:.68rem;color:var(--muted);margin-top:25px}@media(max-width:850px){.layout{grid-template-columns:230px minmax(0,1fr)}.sidebar{padding:25px 15px}.workspace{padding:26px 22px}.welcome{display:block}.welcome h1{margin-bottom:16px}.progress-pill{display:inline-block;margin-bottom:12px}.tabs button{padding:10px 12px}}@media(max-width:650px){.topbar{padding:17px 18px;gap:8px}.brand{font-size:1.5rem}.level{font-size:.6rem;padding:6px 8px}.topbar .text-button{font-size:.75rem;padding:6px 8px}.layout{display:block}.sidebar{border-right:0;border-bottom:1px solid var(--line);padding:15px 18px}.sidebar>.eyebrow,.sidebar h2,.sidebar-note,#lesson-nav{display:none}.mobile-select{display:block;margin:0;font-size:.75rem}.mobile-select select{margin-top:5px}.workspace{padding:24px 16px}.stats{gap:10px;padding-bottom:20px;margin-bottom:18px}.stats strong{font-size:1.5rem}.stats span{font-size:.68rem}.welcome h1{font-size:1.9rem}.welcome .eyebrow{font-size:.6rem}.panel{padding:20px 17px}.panel h2{font-size:1.45rem}.tabs{gap:3px}.tabs button{font-size:.75rem;padding:10px 11px}.actions{display:grid}.actions button{width:100%}.word{grid-template-columns:minmax(0,1fr) minmax(0,1fr) auto;gap:8px;font-size:.8rem}.auth-card{padding:28px 22px}.auth-page{padding:18px}.chat-heading{display:block}#chat-history{max-height:45dvh}.message{max-width:100%}}@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important}}
