:root{--bg:#fff8ec;--card:#fff;--ink:#2d2a32;--muted:#7b7684;--line:#efe6d6;--primary:#ff7a45;--primary-dark:#e8622e;--green:#2fa866;--green-bg:#e4f7ec;--red:#e5484d;--red-bg:#fde8e8;--blue:#4c7dff;--yellow:#ffc94d;--radius:18px}*{box-sizing:border-box}html,body{background:var(--bg);color:var(--ink);-webkit-text-size-adjust:100%;margin:0;font-family:-apple-system,BlinkMacSystemFont,PingFang SC,Microsoft YaHei,Segoe UI,sans-serif;font-size:16px;line-height:1.6}a{color:var(--primary-dark);text-decoration:none}h1,h2,h3{margin:0 0 12px;line-height:1.3}h1{font-size:26px}h2{font-size:20px}p{margin:0 0 12px}.muted{color:var(--muted)}.small{font-size:14px}.center{text-align:center}.phonetic{color:var(--muted);font-family:Lucida Sans Unicode,Arial Unicode MS,Segoe UI,sans-serif}.container{max-width:760px;margin:0 auto;padding:16px 16px 96px}.row{flex-wrap:wrap;align-items:center;gap:10px;display:flex}.spread{justify-content:space-between;align-items:center;gap:10px;display:flex}.grow{flex:1;min-width:0}.stack>*+*{margin-top:14px}.card{background:var(--card);border-radius:var(--radius);box-shadow:0 2px 0 var(--line);border:1px solid var(--line);padding:18px}.btn{font:inherit;color:var(--ink);cursor:pointer;background:#f3ecdf;border:0;border-radius:14px;justify-content:center;align-items:center;gap:6px;min-height:44px;padding:10px 16px;font-weight:600;transition:transform 50ms;display:inline-flex}.btn:active{transform:translateY(2px)}.btn:disabled{opacity:.5;cursor:default}.btn.primary{background:var(--primary);color:#fff;box-shadow:0 3px 0 var(--primary-dark)}.btn.green{background:var(--green);color:#fff;box-shadow:0 3px #23874f}.btn.red{background:var(--red);color:#fff;box-shadow:0 3px #c2363b}.btn.yellow{background:var(--yellow);box-shadow:0 3px #e0a92b}.btn.big{width:100%;min-height:56px;padding:14px 22px;font-size:19px}.btn.ghost{color:var(--muted);background:0 0;min-height:36px;padding:6px 10px}.btn.sm{min-height:36px;padding:6px 12px;font-size:14px}input,select,textarea{font:inherit;color:inherit;border:2px solid var(--line);background:#fff;border-radius:12px;width:100%;min-height:44px;padding:10px 12px}input:focus,select:focus,textarea:focus{border-color:var(--primary);outline:none}label{margin-bottom:4px;font-size:14px;font-weight:600;display:block}.field{margin-bottom:14px}.error{background:var(--red-bg);color:var(--red);border-radius:12px;padding:10px 14px;font-size:14px}.notice{background:var(--green-bg);color:#1d7a48;border-radius:12px;padding:10px 14px;font-size:14px}.topbar{z-index:5;background:var(--bg);border-bottom:1px solid var(--line);position:sticky;top:0}.topbar-inner{justify-content:space-between;align-items:center;max-width:760px;margin:0 auto;padding:10px 16px;display:flex}.brand{color:var(--ink);font-size:18px;font-weight:800}.tabbar{z-index:5;border-top:1px solid var(--line);padding-bottom:env(safe-area-inset-bottom);background:#fff;justify-content:center;display:flex;position:fixed;bottom:0;left:0;right:0}.tabbar a{text-align:center;max-width:150px;color:var(--muted);flex:1;padding:8px 0 6px;font-size:12px;font-weight:600}.tabbar a span{font-size:22px;line-height:1.2;display:block}.tabbar a.active{color:var(--primary-dark)}.bar{background:#f3ecdf;border-radius:99px;height:10px;overflow:hidden}.bar>i{background:var(--green);border-radius:99px;height:100%;transition:width .3s;display:block}.tiles{grid-template-columns:repeat(auto-fit,minmax(120px,1fr));gap:10px;display:grid}.tile{background:var(--card);border:1px solid var(--line);border-radius:var(--radius);text-align:center;padding:14px}.tile b{font-size:28px;line-height:1.2;display:block}.tile span{color:var(--muted);font-size:13px}.word-row{border-top:1px solid var(--line);align-items:center;gap:8px;padding:10px 0;display:flex}.word-row .w{font-size:17px;font-weight:700}.dot{background:#d9d2c5;border-radius:50%;flex:none;width:10px;height:10px}.dot.learning{background:var(--yellow)}.dot.due{background:var(--primary)}.dot.mastered{background:var(--green)}.icon-btn{cursor:pointer;background:#f3ecdf;border:0;border-radius:50%;flex:none;width:38px;height:38px;font-size:17px}.study{flex-direction:column;gap:16px;min-height:calc(100vh - 160px);display:flex}.question{text-align:center;flex-direction:column;flex:1;justify-content:center;align-items:center;gap:12px;padding:28px 18px;display:flex}.big-word{word-break:break-word;font-size:clamp(34px,9vw,52px);font-weight:800;line-height:1.15}.big-meaning{font-size:24px;font-weight:700}.speaker{color:var(--primary-dark);cursor:pointer;background:#fff1e8;border:0;border-radius:50%;width:64px;height:64px;font-size:30px}.speaker.huge{width:110px;height:110px;font-size:52px}.options{gap:10px;width:100%;display:grid}.option{border:2px solid var(--line);font:inherit;text-align:left;cursor:pointer;color:var(--ink);background:#fff;border-radius:14px;padding:14px;font-size:17px;font-weight:600}.option.right{border-color:var(--green);background:var(--green-bg)}.option.wrong{border-color:var(--red);background:var(--red-bg)}.spell-input{text-align:center;letter-spacing:1px;font-size:26px;font-weight:700}.feedback{border-radius:14px;width:100%;padding:12px;font-weight:700}.feedback.right{background:var(--green-bg);color:#1d7a48}.feedback.wrong{background:var(--red-bg);color:var(--red)}.tag{color:var(--primary-dark);background:#fff1e8;border-radius:99px;padding:2px 12px;font-size:13px;font-weight:700;display:inline-block}.modes{gap:10px;display:grid}.mode{text-align:left;border:2px solid var(--line);font:inherit;color:inherit;cursor:pointer;background:#fff;border-radius:16px;align-items:center;gap:12px;padding:12px 14px;display:flex}.mode.active{border-color:var(--primary);background:#fff6f0}.mode span{font-size:28px}.chart{align-items:flex-end;gap:4px;height:120px;display:flex}.chart div{height:100%;color:var(--muted);flex-direction:column;flex:1;justify-content:flex-end;align-items:center;font-size:10px;display:flex}.chart i{background:var(--primary);border-radius:6px 6px 0 0;width:100%;min-height:2px;display:block}.hero{text-align:center;padding:40px 0 24px}.hero h1{font-size:clamp(28px,7vw,42px)}.features{grid-template-columns:repeat(auto-fit,minmax(210px,1fr));gap:12px;display:grid}.features .card b{margin:6px 0 4px;font-size:17px;display:block}.features .card span.emoji{font-size:32px}table.words{border-collapse:collapse;width:100%}table.words td{border-top:1px solid var(--line);vertical-align:top;padding:8px 6px}.avatars{flex-wrap:wrap;gap:8px;display:flex}.avatars button{border:2px solid var(--line);cursor:pointer;background:#fff;border-radius:50%;width:48px;height:48px;font-size:26px}.avatars button.active{border-color:var(--primary);background:#fff1e8}.thumbs{flex-wrap:wrap;gap:8px;display:flex}.thumbs img{object-fit:cover;border:1px solid var(--line);border-radius:12px;width:84px;height:84px}.edit-grid{grid-template-columns:1.1fr 1fr 1.4fr auto;gap:6px;margin-top:6px;display:grid}.edit-grid input{min-height:38px;padding:6px 8px;font-size:15px}@media (max-width:520px){.edit-grid{grid-template-columns:1fr 1fr auto}.edit-grid input:nth-child(3){grid-area:2/1/auto/3}}