:root{--ground:#f4f6f9;--surface:#fff;--ink:#172033;--ink-2:#505b70;--rule:#dde2ea;--rule-strong:#bcc5d3;--gemini:#2f4fc4;--gemini-tint:#e7ecfa;--groq:#c8431c;--groq-tint:#fbe9e2;--mark:#a56200;--mark-tint:#fbf0dc;--ok:#1d7a46;--bad:#b3261e;--bad-tint:#fbe4e2;--accent:var(--ink);--accent-tint:var(--rule);--shadow:#17203338;--sans:"Noto Sans TC", "Microsoft JhengHei", system-ui, sans-serif;--latin:"Atkinson Hyperlegible", "Segoe UI", system-ui, sans-serif;--mono:"IBM Plex Mono", ui-monospace, Consolas, monospace;--lightningcss-light:initial;--lightningcss-dark: ;color-scheme:light}@media (prefers-color-scheme:dark){:root{--ground:#0f131b;--surface:#161c27;--ink:#e5e9f1;--ink-2:#a0aabd;--rule:#262e3c;--rule-strong:#3a4456;--gemini:#8ba2f5;--gemini-tint:#1d2545;--groq:#f2875f;--groq-tint:#37211a;--mark:#e5a63f;--mark-tint:#33270f;--ok:#6fcf97;--bad:#f28b82;--bad-tint:#3a1c1a;--shadow:#0009;--lightningcss-light: ;--lightningcss-dark:initial;color-scheme:dark}}*{box-sizing:border-box}html,body{height:100%;margin:0}body{background:var(--ground);color:var(--ink);font-family:var(--sans);-webkit-font-smoothing:antialiased;-webkit-tap-highlight-color:transparent;font-size:16px;line-height:1.6}#root{min-height:100%}button,input{font:inherit;color:inherit}button{cursor:pointer}button:disabled{cursor:default;opacity:.45}:focus-visible{outline:2px solid var(--accent);outline-offset:2px}a{color:inherit}.t-gemini{--accent:var(--gemini);--accent-tint:var(--gemini-tint)}.t-groq{--accent:var(--groq);--accent-tint:var(--groq-tint)}.en{font-family:var(--latin)}.mono{font-family:var(--mono);font-variant-numeric:tabular-nums}.muted{color:var(--ink-2)}.small{font-size:13.5px}.label{color:var(--ink-2);letter-spacing:.04em;margin:0;font-size:13px;font-weight:500}.error{color:var(--bad);margin:0}.ok{color:var(--ok)}.bad{color:var(--bad)}.stack{gap:10px;display:grid}.boot{min-height:100vh}.page{gap:28px;max-width:520px;margin:0 auto;padding:28px 20px 40px;display:grid}.brand{letter-spacing:.02em;margin:0;font-size:26px;font-weight:700}.primary{background:var(--accent);color:var(--surface);border:0;border-radius:14px;padding:13px 18px;font-weight:700}.ghost{border:1px solid var(--rule-strong);background:var(--surface);border-radius:12px;padding:9px 12px;font-size:14.5px}.link{text-underline-offset:3px;color:var(--ink-2);background:0 0;border:0;padding:0;text-decoration:underline}.icon{background:0 0;border:0;padding:6px 8px 6px 0;font-size:22px;line-height:1}.replay{color:var(--ink-2);text-underline-offset:3px;background:0 0;border:0;justify-self:start;padding:2px 0;font-size:13px;text-decoration:underline}.field{color:var(--ink-2);gap:6px;font-size:14px;display:grid}.field input[type=password],.field input[type=text],.type-row input{border:1px solid var(--rule-strong);background:var(--surface);color:var(--ink);border-radius:12px;padding:11px 13px;font-size:16px}.login{align-content:center;min-height:90vh}.login .primary{background:var(--ink)}.home-head{gap:4px;display:grid}.home-head p{margin:0}.teacher-pick{grid-template-columns:1fr 1fr;gap:10px;display:grid}.teacher-card{text-align:left;border:1.5px solid var(--rule-strong);background:var(--surface);border-radius:16px;gap:2px;padding:14px 14px 13px;display:grid}.teacher-card .teacher-name{color:var(--accent);font-size:17px;font-weight:700}.teacher-card .teacher-model{color:var(--ink-2);font-size:12.5px}.teacher-card.is-on{border-color:var(--accent);background:var(--accent-tint);box-shadow:inset 0 0 0 1px var(--accent)}.segmented{border:1px solid var(--rule-strong);background:var(--surface);border-radius:12px;grid-template-columns:repeat(3,1fr);padding:3px;display:grid}.segmented button{color:var(--ink-2);background:0 0;border:0;border-radius:9px;padding:8px 0;font-size:15px}.segmented button.is-on{background:var(--ink);color:var(--surface);font-weight:700}.segmented+p{margin:0}.start{text-align:left;gap:2px;padding:16px 18px;font-size:18px;display:grid}.start span{opacity:.85;font-size:13px;font-weight:400}.home .stack>p{margin:0}.home-foot{color:var(--ink-2);border-top:1px solid var(--rule);gap:20px;padding-top:8px;font-size:14px;display:flex}.talk{flex-direction:column;max-width:560px;height:100dvh;margin:0 auto;display:flex}.talk .lines{flex:1;min-height:0}.talk-title{text-overflow:ellipsis;white-space:nowrap;min-width:0;overflow:hidden}.task-bar{background:var(--surface);border-bottom:1px solid var(--rule);align-items:baseline;gap:10px;margin:0;padding:8px 16px;font-size:14.5px;line-height:1.5;display:flex}.task-bar .label{flex:none;font-size:12px}.task-bar.is-done{background:var(--accent-tint)}.task-bar.is-done .label{color:var(--accent);font-weight:700}.chip-model{opacity:.85;font-size:12px;font-weight:400}.talk-head{border-bottom:1px solid var(--rule);background:var(--ground);align-items:center;gap:10px;padding:10px 16px;display:flex}.chip{color:var(--accent);background:var(--accent-tint);white-space:nowrap;border-radius:999px;align-items:center;gap:6px;padding:1px 10px 1px 8px;font-size:14px;font-weight:700;display:inline-flex}.chip:before{content:"";background:currentColor;border-radius:50%;width:8px;height:8px}.timer{font-family:var(--mono);font-variant-numeric:tabular-nums;margin-left:auto;font-size:15px}.timer.is-low{color:var(--bad)}.banner{background:var(--bad-tint);color:var(--ink);border-radius:12px;margin:10px 16px 0;padding:10px 12px;font-size:14px}.lines{align-content:start;gap:16px;margin:0;padding:16px 16px 8px;list-style:none;display:grid;overflow-y:auto}.line{gap:3px;display:grid}.line p{margin:0}.who{color:var(--ink-2);font-size:12px}.who .model{opacity:.8}.line.tutor .en{font-size:18px;line-height:1.55}.line.me{border-left:3px solid var(--rule-strong);padding-left:12px}.line.me p{font-size:17px;line-height:1.8}.line.me .meta{color:var(--ink-2);font-variant-numeric:tabular-nums;font-size:12px}.line.is-waiting p{color:var(--ink-2)}.line.is-error{border-left-color:var(--bad)}.line.zh{border-left:3px solid var(--accent);padding-left:12px}.helper{background:var(--accent-tint);border-radius:12px;gap:2px;margin-top:6px;padding:10px 12px;display:grid}.helper .en{font-size:17px}.spacer{height:1px}.mark{-webkit-text-decoration-color:var(--mark);text-decoration-color:var(--mark);text-underline-offset:5px}.mark-grammar{-webkit-text-decoration:underline wavy var(--mark);text-decoration:underline wavy var(--mark);text-decoration-thickness:1.5px}.mark-natural{-webkit-text-decoration:underline dashed var(--mark);text-decoration:underline dashed var(--mark);text-decoration-thickness:1.8px}.mark-pron{-webkit-text-decoration:underline dotted var(--mark);text-decoration:underline dotted var(--mark);text-decoration-thickness:2.6px}.pause{font-family:var(--mono);color:var(--mark);background:var(--mark-tint);white-space:nowrap;vertical-align:2px;border-radius:5px;padding:1px 5px;font-size:11.5px}.dots{gap:5px;padding:8px 0;display:inline-flex}.dots i{background:var(--accent);opacity:.35;border-radius:50%;width:7px;height:7px;animation:1.2s infinite blink}.dots i:nth-child(2){animation-delay:.2s}.dots i:nth-child(3){animation-delay:.4s}@keyframes blink{40%{opacity:1}}.controls{padding:10px 16px calc(14px + env(safe-area-inset-bottom));border-top:1px solid var(--rule);background:var(--ground);gap:10px;display:grid}.notice{color:var(--mark);text-align:center;margin:0;font-size:14px}.type-row{grid-template-columns:1fr auto;gap:8px;display:grid}.type-row .primary{padding:10px 16px}.hold{-webkit-user-select:none;user-select:none;-webkit-touch-callout:none;touch-action:none}.hold-main{background:var(--ink);color:var(--surface);border:0;border-radius:18px;padding:18px;font-size:18px;font-weight:700;transition:transform .12s,background .12s}.hold-main.is-active{background:var(--accent);transform:scale(.98)}.ghost.hold.is-active{background:var(--accent);color:var(--surface);border-color:var(--accent)}.aux{grid-template-columns:1fr 1.6fr 1fr;gap:8px;display:grid}.sheet-backdrop{z-index:10;background:#0f131b73;align-items:end;display:grid;position:fixed;inset:0}.sheet{background:var(--surface);padding:22px 20px calc(22px + env(safe-area-inset-bottom));width:100%;max-width:560px;box-shadow:0 -12px 40px var(--shadow);border-radius:22px 22px 0 0;gap:12px;margin:0 auto;display:grid}.sheet h2{margin:0;font-size:20px}.sheet p{margin:0}.stats{grid-template-columns:repeat(3,1fr);gap:10px;margin:4px 0;display:grid}.stats div{border:1px solid var(--rule);border-radius:12px;padding:10px 12px}.stats dt{color:var(--ink-2);font-size:12.5px}.stats dd{font-variant-numeric:tabular-nums;margin:0;font-size:22px;font-weight:700}.row{grid-template-columns:1fr 1fr;gap:10px;display:grid}.lab-head{gap:6px;display:grid}.lab-head h1{margin:0;font-size:24px}.lab-head p{margin:0}.back{color:var(--ink-2);font-size:14px;text-decoration:none}.lab-block{border-top:1px solid var(--rule-strong);gap:10px;padding-top:22px;display:grid}.lab-block h2{margin:0;font-size:18px}.lab-block p{margin:0}.lab-block dl{gap:6px;margin:0;display:grid}.kv{grid-template-columns:6.5em 1fr;gap:10px;font-size:14.5px;display:grid}.kv dt{color:var(--ink-2)}.kv dd{margin:0}.voice-list{border:1px solid var(--rule);background:var(--surface);border-radius:12px;margin:0;padding:0;list-style:none;display:grid}.voice-list li{border-top:1px solid var(--rule);align-items:center;gap:10px;padding:9px 12px;display:flex}.voice-list li:first-child{border-top:0}.voice-list li.is-on{background:var(--ground)}.voice-list label{flex:1;align-items:center;gap:10px;font-size:14.5px;display:flex}.voice-list .replay{margin-left:auto}.result{background:var(--surface);border:1px solid var(--rule);border-radius:12px;gap:8px;padding:12px;display:grid}.words{gap:1px;margin:8px 0 0;padding-left:0;font-size:12.5px;list-style:none;display:grid}.tally{font-size:15px}.pron-list{gap:14px;margin:0;padding-left:22px;display:grid}.pron-list p{margin:0}.pron-list .en{font-size:16.5px}.target{color:var(--mark)}.pron-row{flex-wrap:wrap;align-items:center;gap:10px;margin-top:6px;display:flex}.verdict{font-size:14px}.verdict.ok{color:var(--ok)}.verdict.bad{color:var(--bad)}@media (prefers-reduced-motion:reduce){.dots i{opacity:.8;animation:none}.hold-main{transition:none}}.page-head{gap:6px;display:grid}.page-head h1{text-wrap:balance;margin:0;font-size:24px;line-height:1.35}.page-head p,.loading{margin:0}.error-box{background:var(--bad-tint);border-radius:12px;gap:8px;padding:12px;display:grid}.error-box p{margin:0}.error-box .ghost{justify-self:start}.as-button{text-align:center;text-decoration:none;display:block}.small-btn{padding:5px 10px;font-size:13px}.field textarea{border:1px solid var(--rule-strong);resize:vertical;background:var(--surface);color:var(--ink);font:inherit;border-radius:12px;padding:11px 13px;font-size:16px;line-height:1.6}.field input[type=range]{accent-color:var(--ink)}.home-title{justify-content:space-between;align-items:baseline;gap:12px;display:flex}.home-title a{text-decoration:none}.tally-row{border-top:1px solid var(--rule-strong);border-bottom:1px solid var(--rule);grid-template-columns:repeat(3,1fr);margin:0;display:grid}.tally-row div{border-left:1px solid var(--rule);padding:10px 0 10px 12px}.tally-row div:first-child{border-left:0;padding-left:0}.tally-row dt{color:var(--ink-2);font-size:12.5px}.tally-row dd{font-variant-numeric:tabular-nums;margin:0;font-size:26px;font-weight:700;line-height:1.3}.tally-row small{color:var(--ink-2);font-size:13px;font-weight:400}.section-title{justify-content:space-between;align-items:baseline;display:flex}.section-title a{text-decoration:none}.rows{border-top:1px solid var(--rule);margin:0;padding:0;list-style:none}.rows li{border-bottom:1px solid var(--rule)}.row-link{align-items:center;gap:12px;padding:11px 0;text-decoration:none;display:flex}.row-main{flex:1;gap:1px;min-width:0;display:grid}.row-main b{font-weight:500}.home-nav{grid-template-columns:1fr 1fr;gap:10px;display:grid}.home-nav a{background:var(--surface);border:1px solid var(--rule);border-radius:14px;gap:2px;padding:12px 14px;text-decoration:none;display:grid}.setup{padding-bottom:120px}.scenario-group{gap:8px;display:grid}.scenario-group h3{margin:6px 0 0;font-size:14px;font-weight:700}.scenario-list{gap:8px;display:grid}.scenario{border:1.5px solid var(--rule);background:var(--surface);border-radius:14px;align-items:center;gap:8px;padding-right:12px;display:flex}.scenario>button{text-align:left;background:0 0;border:0;flex:1;gap:1px;padding:11px 14px;display:grid}.scenario b{font-size:15.5px;font-weight:700}.scenario .progress{color:var(--ok)}.scenario.is-on{border-color:var(--ink);box-shadow:inset 0 0 0 1px var(--ink)}.scenario.add{border-style:dashed;gap:1px;padding:11px 14px;text-decoration:none;display:grid}.sticky-cta{padding:12px 20px calc(12px + env(safe-area-inset-bottom));background:linear-gradient(to top, var(--ground) 70%, transparent);position:fixed;bottom:0;left:0;right:0}.sticky-cta .start{width:100%;max-width:480px;margin:0 auto;display:grid}.scenario-card{background:var(--surface);border:1px solid var(--rule);border-radius:16px;gap:12px;padding:16px;display:grid}.card-dl{gap:10px;margin:0;display:grid}.card-dl dt{color:var(--ink-2);font-size:12.5px}.card-dl dd{margin:0;font-size:15px}.report{gap:24px}.author{align-items:center;gap:8px;display:flex}.writing{background:var(--surface);border:1px solid var(--rule);border-radius:14px;gap:4px;padding:16px;display:grid}.writing p{margin:0}.task-result{border:1px solid var(--rule-strong);border-radius:14px;gap:4px;padding:12px 14px;display:grid}.task-result p{margin:0}.task-result.is-done{border-color:var(--ok)}.task-result.is-done .label{color:var(--ok);font-weight:700}.summary{margin:0;font-size:17px;line-height:1.75}.report-block{border-top:1px solid var(--rule-strong);gap:10px;padding-top:18px;display:grid}.report-block h2{margin:0;font-size:17px}.report-block p{margin:0}.count{font-family:var(--mono);color:var(--ink-2);margin-left:4px;font-size:13px;font-weight:500}.items{gap:16px;margin:0;padding:0;list-style:none;display:grid}.items li{gap:4px;display:grid}.original{color:var(--ink-2);font-size:16px;line-height:1.85}.original u{color:var(--ink)}.fix{font-size:16.5px}.strike{text-decoration:line-through;-webkit-text-decoration-color:var(--bad);text-decoration-color:var(--bad);color:var(--ink-2)}.better{flex-wrap:wrap;align-items:baseline;gap:4px 10px;font-size:16px;display:flex}.report .stats dd small,.stats dd small{color:var(--ink-2);font-size:12px;font-weight:400}.replay-list{gap:14px;margin:0;padding:0;list-style:none;display:grid}.replay-list li{gap:2px;display:grid}.replay-list p{font-size:16px;line-height:1.8}.replay-row{flex-wrap:wrap;align-items:baseline;gap:4px 16px;display:flex}.zh-turn{border-left:2px solid var(--rule-strong);padding-left:10px}.report-actions{gap:10px;padding-top:6px;display:grid}.segmented.three button{font-size:14px}.tabs{gap:6px;padding-bottom:2px;display:flex;overflow-x:auto}.tabs button{border:1px solid var(--rule-strong);background:var(--surface);border-radius:999px;flex:none;padding:6px 12px;font-size:14px}.tabs button.is-on{background:var(--ink);color:var(--surface);border-color:var(--ink)}.mistake-list{gap:12px;margin:0;padding:0;list-style:none;display:grid}.mistake-list li{background:var(--surface);border:1px solid var(--rule);border-radius:14px;gap:5px;padding:12px 14px;display:grid}.mistake-list p{margin:0}.mistake-head{justify-content:space-between;align-items:baseline;display:flex}.times{color:var(--mark);font-size:15px;font-weight:500}.mistake-foot{flex-wrap:wrap;justify-content:space-between;align-items:center;gap:10px;margin-top:4px;display:flex}