:root{--bg:#f4f8ee;--card:#fff;--ink:#26342a;--muted:#667569;--green:#4c9a52;--green-d:#2f7a37;--green-l:#e3f1d6;--red:#c0453a;--red-l:#fbe5e1;--line:#d9e4cc;--radius:16px}*{box-sizing:border-box;-webkit-tap-highlight-color:transparent}html,body{background:var(--bg);color:var(--ink);margin:0}body{-webkit-text-size-adjust:100%;font:18px/1.5 -apple-system,BlinkMacSystemFont,PingFang TC,Noto Sans TC,Microsoft JhengHei,Segoe UI,sans-serif}h1{margin:8px 0 12px;font-size:26px}h2{margin:0 0 10px;font-size:20px}p{margin:0 0 10px}a{color:var(--green-d)}.muted{color:var(--muted);font-size:15px}.center{text-align:center}.pad{padding:40px 0}.big{font-size:22px;font-weight:700}.block{margin-top:12px;display:block}.shell{min-height:100vh;flex-direction:column;min-height:100dvh;display:flex}.page{width:100%;max-width:560px;padding:16px 16px calc(24px + env(safe-area-inset-bottom));padding-top:calc(12px + env(safe-area-inset-top));flex:1;margin:0 auto}.shell:not(.review)>.page{padding-bottom:96px}.tabs{background:var(--card);border-top:1px solid var(--line);padding-bottom:env(safe-area-inset-bottom);display:flex;position:fixed;bottom:0;left:0;right:0}.tabs a{text-align:center;color:var(--muted);flex:1;min-height:56px;padding:8px 4px 10px;font-size:14px;text-decoration:none}.tabs a span{font-size:22px;line-height:1.2;display:block}.tabs a.on{color:var(--green-d);font-weight:700}.card{background:var(--card);border-radius:var(--radius);margin-bottom:14px;padding:16px;box-shadow:0 1px 4px #2846281a}.card.note{background:#fff8e0;font-size:16px}.card.done{text-align:center}.stats{text-align:center;color:var(--muted);grid-template-columns:repeat(3,1fr);font-size:14px;display:grid}.stats b{color:var(--green-d);font-size:28px;display:block}.btn{width:100%;min-height:56px;font:inherit;text-align:center;background:var(--green-l);color:var(--green-d);cursor:pointer;border:0;border-radius:14px;margin:10px 0 0;padding:12px 16px;font-weight:700;text-decoration:none;display:block}.btn:disabled{opacity:.45;cursor:default}.btn.primary{background:var(--green);color:#fff}.btn.secondary{background:var(--green-l);color:var(--green-d)}.btn.good{background:var(--green);color:#fff}.btn.bad,.btn.danger{background:var(--red-l);color:var(--red)}.btn.huge{min-height:120px;margin:12px 0 14px;padding-top:22px;font-size:26px}.btn.huge small{opacity:.9;margin-top:4px;font-size:15px;font-weight:400;display:block}.two{grid-gap:10px;grid-template-columns:1fr 1fr;display:grid}.two.block{display:grid}.topbar{padding:calc(10px + env(safe-area-inset-top)) 16px 0;align-items:center;width:100%;max-width:560px;margin:0 auto;display:flex}.topbar .x{color:var(--muted);padding:8px 12px 8px 0;font-size:22px;text-decoration:none}.topbar .bar{background:var(--line);border-radius:5px;flex:1;height:10px;overflow:hidden}.topbar .bar i{background:var(--green);height:100%;transition:width .2s;display:block}.topbar .count{color:var(--muted);text-align:right;min-width:52px;padding-left:10px;font-size:14px}.tag{color:var(--muted);margin-bottom:8px;font-size:14px}.prompt{word-break:break-word;margin:6px 0 12px;font-size:30px;font-weight:700}.prompt.sentence{font-size:22px;font-weight:500;line-height:2.1}.speak{background:var(--green-l);vertical-align:middle;cursor:pointer;border:0;border-radius:50%;width:44px;height:44px;font-size:20px}.back{background:#f8fbf3;border-radius:12px;margin:8px 0;padding:12px}.back .en{margin-bottom:4px;font-size:24px;font-weight:700}.back .zh{font-size:22px}.back .pos{color:var(--green-d);font-size:16px;font-style:italic}.back .star{color:#e0a000;margin-left:6px}.back .row{margin:6px 0 0;font-size:16px;display:flex}.back .row b{color:var(--green-d);flex:0 0 3.6em}.choices{grid-gap:10px;margin-top:8px;display:grid}.btn.choice{border:2px solid var(--line);color:var(--ink);background:#fff;margin:0;font-size:22px}.btn.choice.good{background:var(--green);color:#fff;border-color:var(--green)}.field,.blank,select{font:inherit;border:2px solid var(--line);color:var(--ink);background:#fff;border-radius:12px}.field{width:100%;min-height:56px;padding:8px 14px;font-size:24px}.field:focus,.blank:focus,select:focus{border-color:var(--green);outline:3px solid #9ed36a}.blank{text-align:center;min-height:44px;margin:0 2px;padding:2px 6px;font-size:22px}.ok{border-color:var(--green)!important;background:var(--green-l)!important}.field.bad,.blank.bad,.built.bad{border-color:var(--red)!important;background:var(--red-l)!important}.bad:-webkit-any(.field,.blank,.built){border-color:var(--red)!important;background:var(--red-l)!important}.bad:is(.field,.blank,.built){border-color:var(--red)!important;background:var(--red-l)!important}.answer{color:var(--red);margin-top:8px;font-weight:700}.built{border:2px dashed var(--line);border-radius:12px;flex-wrap:wrap;align-items:center;min-height:64px;padding:8px;display:flex}.built.ok,.built.bad{border-style:solid}.pool{flex-wrap:wrap;margin-top:10px;display:flex}.chip{font:inherit;border:2px solid var(--green);min-height:48px;color:var(--ink);cursor:pointer;background:#fff;border-radius:24px;margin:4px;padding:6px 14px;font-size:20px}.chip:disabled{opacity:.3}.built .chip:disabled{opacity:1}.after{margin-top:4px}.verdict{font-size:22px;font-weight:700}.verdict.ok{color:var(--green-d);background:0 0!important}.verdict.bad{color:var(--red);background:0 0!important}.lbl{justify-content:space-between;align-items:center;margin-bottom:8px;display:flex}select{min-width:150px;min-height:48px;padding:6px 10px;font-size:18px}.rank{margin:12px 0 0;padding-left:1.3em}.rank li{margin-bottom:4px}.rank .muted{float:right}.table{border-collapse:collapse;text-align:center;width:100%}.table th,.table td{border-bottom:1px solid var(--line);padding:6px 4px}.table td:first-child{text-align:left}.stepper{align-items:center;margin-bottom:6px;display:flex}.stepper span{flex:1}.stepper .btn{width:56px;margin:0}.stepper output{text-align:center;min-width:64px;font-size:22px;font-weight:700}.notice{background:var(--green-l);border-radius:10px;margin-top:12px;padding:10px;font-size:16px}@media (prefers-reduced-motion:reduce){*{transition:none!important;animation:none!important}}@media (max-width:359px){body{font-size:17px}.prompt{font-size:26px}}
