:root{color:#17332e;background:#f5f7f4;font-family:Inter,ui-sans-serif,system-ui,-apple-system,Segoe UI,sans-serif;line-height:1.5}*{box-sizing:border-box}body{margin:0}button,select{font:inherit}button{cursor:pointer;border:0}header{z-index:2;background:#fff;border-bottom:1px solid #e5ebe7;justify-content:space-between;align-items:center;height:76px;padding:0 clamp(20px,5vw,80px);display:flex;position:sticky;top:0}.brand{align-items:center;gap:10px;display:flex}.brand-mark{color:#fff;background:#16796b;border-radius:12px;place-items:center;width:36px;height:36px;font-weight:800;display:grid}.brand small{color:#83918c;font-size:11px;display:block}nav{gap:8px;display:flex}nav button{color:#60726d;background:0 0;border-radius:9px;padding:10px 14px}nav button.active,nav button:hover{color:#146c5f;background:#e6f2ef;font-weight:700}main{max-width:1120px;min-height:calc(100vh - 130px);margin:auto;padding:60px 24px}footer{text-align:center;color:#9aa8a3;padding:20px;font-size:12px}.hero{grid-template-columns:1.2fr .8fr;align-items:center;gap:80px;padding-top:5vh;display:grid}.eyebrow{letter-spacing:2px;color:#26917d;font-size:11px;font-weight:800}.hero h1{margin:18px 0;font-size:clamp(40px,6vw,70px);line-height:1.1}.hero h1 em{color:#26917d;font-style:normal}.hero p{color:#657773;max-width:500px;font-size:18px}.actions{gap:12px;margin-top:28px;display:flex}.primary,.secondary{border-radius:10px;padding:13px 20px;font-weight:700}.primary{color:#fff;background:#177968}.secondary{color:#176c5e;background:#e3efec}.hero-card{text-align:center;background:#fff;border:1px solid #e6ece8;border-radius:24px;padding:35px;box-shadow:0 15px 50px #1a544010}.ring{background:conic-gradient(#17816e var(--p),#e6efec 0);border-radius:50%;place-items:center;width:190px;height:190px;margin:auto;display:grid}.ring:after{content:"";position:absolute}.ring b{color:#176c5e;background:#fff;border-radius:50%;place-items:center;width:145px;height:145px;font-size:42px;display:grid}.ring small{font-size:18px}.hero-card>span{color:#74837e;margin:16px;display:block}.mini-stats{justify-content:center;gap:36px;display:flex}.mini-stats i{color:#83908c;font-size:12px;font-style:normal}.mini-stats b{color:#17332e;font-size:22px;display:block}.section-head{justify-content:space-between;align-items:end;margin-bottom:25px;display:flex}.section-head h2,.progress h2,.about h2{margin:8px 0;font-size:38px}.section-head select{background:#fff;border:1px solid #d5e1dc;border-radius:8px;padding:10px}.mode-tabs{border-bottom:1px solid #dce6e1;align-items:center;gap:8px;margin-bottom:26px;display:flex}.mode-tabs button{color:#72827c;background:0 0;padding:12px 15px}.mode-tabs .selected{color:#147463;border-bottom:2px solid #147d6a;font-weight:700}.mode-tabs span{color:#9aa8a3;margin-left:auto;font-size:13px}.quiz-card{text-align:center;background:#fff;border:1px solid #e1ebe6;border-radius:20px;max-width:720px;margin:auto;padding:30px}.listen-card{color:#5f8479;background:#edf7f3;border-radius:15px;flex-direction:column;justify-content:center;align-items:center;gap:10px;height:170px;display:flex}.play{color:#fff;background:#167c6b;border-radius:50%;width:64px;height:64px;font-size:23px}.quiz-image{object-fit:cover;border-radius:14px;width:100%;height:210px}.prompt{margin:22px;font-size:19px;font-weight:700}.choices{grid-template-columns:1fr 1fr;gap:12px;display:grid}.choices button{color:#27443d;background:#fff;border:1px solid #d9e5df;border-radius:10px;padding:15px}.choices button:hover{background:#f0f8f5;border-color:#1a8a76}.choices button.correct{background:#dff4e8;border-color:#4cac74}.choices button.muted{opacity:.5}.retry{color:#d78134;margin:15px}.error{color:#c04444;margin:15px}.answer{text-align:left;border-top:1px solid #e6ede9;margin-top:25px;padding-top:20px}.answer-top{align-items:center;gap:18px;display:flex}.answer-top img{object-fit:cover;border-radius:10px;width:90px;height:70px}.answer h3{margin:0;font-size:28px}.answer p{color:#718079;margin:4px 0}.example{font-style:italic;color:#45665e!important;margin-top:18px!important}.translation{font-size:14px}.audio-row{gap:8px;margin-top:15px;display:flex}.audio-row button{color:#1a6e5f;background:#e9f3ef;border-radius:8px;padding:8px 12px}.next{margin-top:20px}.stat-grid{grid-template-columns:repeat(4,1fr);gap:15px;margin:30px 0 50px;display:grid}.stat{background:#fff;border:1px solid #e2ebe7;border-radius:14px;padding:20px}.stat small,.stat span{color:#7c8984;font-size:13px;display:block}.stat b{margin:7px 0;font-size:35px;display:block}.lesson-list{background:#fff;border-radius:15px;padding:10px 25px}.lesson-row{border-bottom:1px solid #eef2f0;grid-template-columns:100px 1fr 70px;align-items:center;gap:15px;padding:15px 0;display:grid}.lesson-row:last-child{border:0}.bar{background:#e5eeea;border-radius:8px;height:8px;overflow:hidden}.bar i{background:#35a58e;height:100%;display:block}.about-grid{grid-template-columns:repeat(3,1fr);gap:18px;margin-top:35px;display:grid}.about-grid article{background:#fff;border:1px solid #e3ebe7;border-radius:15px;padding:25px}.about-grid b{color:#2a9a83;font-size:28px}.about-grid h3{margin-bottom:5px}.about-grid p{color:#72817b}.empty{text-align:center;color:#6e7d77;padding:100px 20px}@media (width<=700px){header{height:auto;padding:14px 18px;display:block}.brand{margin-bottom:12px}nav{justify-content:space-between}nav button{padding:7px 8px;font-size:13px}main{padding:36px 16px}.hero{grid-template-columns:1fr;gap:35px;padding-top:0}.hero h1{font-size:43px}.hero-card{padding:25px}.section-head{align-items:start;gap:10px}.section-head h2,.progress h2,.about h2{font-size:30px}.choices{grid-template-columns:1fr}.stat-grid{grid-template-columns:1fr 1fr;gap:10px;margin-bottom:35px}.about-grid{grid-template-columns:1fr}.lesson-row{grid-template-columns:80px 1fr 50px;font-size:13px}}