:root{--ink:#233f37;--green:#316b53;--cream:#f8f7f0;--line:#e1e6db}*{box-sizing:border-box}body{margin:0;background:var(--cream);color:var(--ink);font:16px system-ui,-apple-system,sans-serif}button,input,select{font:inherit}button{cursor:pointer;border:1px solid var(--line);border-radius:15px;padding:13px 18px;background:#fff;color:var(--ink);font-weight:600}button:hover{background:#edf3e5}button:disabled{opacity:.6;cursor:wait}button:focus-visible,input:focus-visible,select:focus-visible{outline:3px solid #e5aa5f;outline-offset:3px}.primary{background:var(--green);color:#fff;border-color:var(--green)}.primary:hover{background:#23523f}input,select{border:1px solid #cbd7c9;border-radius:12px;padding:12px;color:var(--ink);background:white;max-width:100%}input{width:100%}main{max-width:1050px;margin:auto;padding:22px 30px 120px}header{display:flex;align-items:center;justify-content:space-between;gap:15px}.brand{font-size:23px;font-weight:800;display:flex;align-items:center;gap:8px}.brand img{width:44px;height:44px}.eyebrow{font-size:12px;font-weight:750;letter-spacing:2px;color:#627e5b}.hero{display:flex;align-items:center;justify-content:space-between;background:#e1eccb;border:1px solid #d4dfb6;border-radius:30px;margin:26px 0;padding:35px 40px;overflow:hidden}.hero img{width:235px;max-width:40%;filter:drop-shadow(0 16px 10px #7b854522)}h1{font-size:38px;line-height:1.15;letter-spacing:-1.3px;margin:12px 0}h2{font-size:25px;letter-spacing:-.5px;margin:10px 0 18px}h3{font-size:18px;margin:6px 0 10px}p{line-height:1.65}.muted{color:#708075}.row{display:flex;align-items:center;gap:10px;flex-wrap:wrap}.between{justify-content:space-between}.stats{display:grid;grid-template-columns:repeat(3,1fr);gap:13px;margin:20px 0 32px}.stat{border-radius:18px;background:white;border:1px solid var(--line);padding:20px}.stat b{display:block;font-size:27px;margin-bottom:4px}.stat span{font-size:13px;color:#708075}.grid{display:grid;grid-template-columns:repeat(3,1fr);gap:16px}.card{border-radius:22px;background:#fff;border:1px solid var(--line);padding:24px}.lesson{width:100%;text-align:left;min-height:190px}.lesson .emoji{font-size:30px;margin-bottom:20px}.lesson small{font-weight:400;display:block;color:#718276;line-height:1.6}.badge{font-size:11px;border-radius:20px;background:#eff3e6;padding:5px 9px;display:inline-block}.section{margin-top:30px}nav{position:fixed;bottom:0;left:0;right:0;z-index:10;background:#fffffff5;border-top:1px solid var(--line);display:flex;justify-content:center;gap:14px;padding:12px 10px max(12px,env(safe-area-inset-bottom));backdrop-filter:blur(14px)}nav button{border:0;min-width:110px;font-size:12px;color:#7a857b;background:transparent;padding:8px 14px}nav button span{font-size:22px;display:block;margin-bottom:4px}nav button.active{background:#e5efda;color:#2d624a}.study{max-width:700px;margin:25px auto}.flash{min-height:280px;text-align:center;display:flex;flex-direction:column;justify-content:center;align-items:center;padding:35px}.word{font-size:38px;line-height:1.4;margin:15px 0;overflow-wrap:anywhere}.pinyin{color:#7b8b74;font-size:18px}.actions{display:flex;justify-content:center;gap:10px;flex-wrap:wrap;margin-top:18px}progress{width:100%;height:7px;accent-color:#629455}.notice{background:#fff4dc;border:1px solid #ecd7aa;border-radius:16px;padding:14px 18px;font-size:14px;line-height:1.6;margin:20px 0}.answer{width:100%;text-align:left;margin-top:10px}.answer.correct{background:#dcefcf;border-color:#7eac72}.answer.wrong{background:#fde4da;border-color:#d5987e}#feedback{min-height:30px}.chat{height:380px;overflow:auto;padding:12px 0}.bubble{max-width:90%;white-space:pre-wrap;border-radius:18px;background:#edf3e4;padding:15px;margin:12px 0;font-size:15px;line-height:1.6}.bubble.user{background:#316b53;color:white;margin-left:auto}.chat-form{display:flex;gap:8px;align-items:center}.chat-form input{flex:1;min-width:0}.chat-form button{padding:12px}.field{display:block;margin:22px 0}.field span{display:block;font-weight:650;margin-bottom:8px}.wide{width:100%}.history{padding:12px 0;border-bottom:1px solid var(--line)}#toast{position:fixed;top:15px;left:50%;transform:translateX(-50%);background:#233f37;color:white;border-radius:14px;padding:13px 20px;z-index:50;max-width:90%;display:none}small{line-height:1.65}.link{color:var(--green)}.footer-note{text-align:center;font-size:12px;color:#8a9489;margin:30px 0}.rating{font-size:13px;color:#687c64}.title-row{margin:28px 0 15px}.empty{text-align:center;padding:30px}.write{font-size:22px}.danger{color:#a04131}@media(max-width:720px){main{padding:18px 18px 110px}.hero{padding:26px 22px;margin:22px 0}.hero img{width:145px;max-width:38%}h1{font-size:29px}.hero p{font-size:14px}.grid{grid-template-columns:repeat(2,1fr)}.stats{gap:8px}.stat{padding:15px 11px}.stat b{font-size:23px}.stat span{font-size:11px}nav{gap:0}nav button{min-width:0;flex:1;padding:8px 4px;font-size:10px}.card{padding:19px}.brand{font-size:20px}header select{font-size:13px;padding:10px}.chat-form{flex-wrap:wrap}.chat-form input{flex-basis:65%}.word{font-size:30px}}@media(max-width:380px){.grid{grid-template-columns:1fr}.hero img{max-width:32%}h1{font-size:25px}}
.school-card .row button{flex:1 1 125px;min-width:0;font-size:14px;padding:12px 10px}.school-card h3{margin-top:14px}
.nhim-ios main{padding-top:calc(18px + env(safe-area-inset-top));padding-left:max(18px,env(safe-area-inset-left));padding-right:max(18px,env(safe-area-inset-right));}