:root{
  --slate:#22382c; --slate-2:#1b2e24; --wood:#6b4a2b; --wood-2:#8a6238;
  --chalk:#f4f1e8; --chalk-dim:#c9cfc5; --yellow:#ffe08a; --pink:#ff9fb4; --blue:#9fd6ff; --green:#a9eba0;
  --ui:#13181d; --ui-2:#1d242b; --ui-3:#2a333c; --ui-text:#e9edf1; --ui-muted:#9aa6b2; --accent:#ffcc4d;
  --ok:#3fbf6a; --ng:#ef6a5a; --pend:#b48cff;
}
*{box-sizing:border-box}
html,body{margin:0;height:100%}
body{background:var(--ui);color:var(--ui-text);font-family:"PingFang TC","Microsoft JhengHei","Noto Sans TC",system-ui,sans-serif;
  display:grid;grid-template-rows:auto 1fr auto;overflow:hidden}
.hidden{display:none!important}
.muted{color:var(--ui-muted);font-size:.9em}

/* ---- top bar ---- */
.topbar{display:flex;align-items:center;gap:16px;padding:8px 16px;background:var(--ui-2);border-bottom:1px solid var(--ui-3)}
.tb-title{font-weight:700;font-size:18px;white-space:nowrap}
.progress{flex:1;display:flex;gap:4px;min-width:0}
.progress span{flex:1;height:8px;border-radius:4px;background:var(--ui-3)}
.progress span.done{background:#5c7a66}
.progress span.cur{background:var(--accent)}
.progress span.chk{outline:2px solid #5d6b78;outline-offset:1px}
.tb-right{display:flex;gap:8px}
.badge{background:var(--ui-3);color:var(--ui-text);border:0;border-radius:999px;padding:5px 12px;font-size:14px;font:inherit;font-size:14px}
.badge.code{cursor:pointer;background:#3a4a2f;color:var(--yellow);font-weight:700}

/* ---- stage ---- */
.stage{display:grid;grid-template-columns:1fr 300px;gap:12px;padding:12px;min-height:0}
.frame{position:relative;background:linear-gradient(135deg,var(--wood-2),var(--wood));border-radius:14px;padding:14px;min-height:0;display:flex;flex-direction:column;
  box-shadow:inset 0 0 0 2px #00000033,0 10px 30px #0006}
.chalkboard{flex:1;min-height:0;overflow:auto;overflow-x:hidden;border-radius:6px;padding:28px 40px 40px;scroll-behavior:smooth;
  background:radial-gradient(ellipse at 30% 20%,#2c4637 0%,var(--slate) 45%,var(--slate-2) 100%);
  color:var(--chalk);font-family:"LXGW WenKai TC","PingFang TC","Microsoft JhengHei",serif;font-size:clamp(22px,2.4vw,40px);line-height:1.6;
  text-shadow:0 0 1px #fff8,0 0 6px #ffffff1a}
.subtitle{flex:none;margin-top:10px;background:#000b;color:#fff;border-radius:10px;padding:0 16px;
  font-size:clamp(16px,1.3vw,21px);line-height:1.5;max-height:0;overflow:auto;opacity:0;transition:opacity .3s,max-height .3s,padding .3s}
.subtitle.on{opacity:1;max-height:24%;padding:10px 16px}

/* board items */
.bi{margin:0 0 .55em;animation:chalkIn .7s ease-out both}
@keyframes chalkIn{from{opacity:0;clip-path:inset(0 100% 0 0)}to{opacity:1;clip-path:inset(0 0 0 0)}}
.bi-title{font-size:1.45em;font-weight:700;color:var(--yellow);border-bottom:3px dashed #ffe08a66;display:inline-block;padding-bottom:.1em;margin-bottom:.7em}
.bi-eq{font-size:1.3em;text-align:center;letter-spacing:.04em}
.bi-note{border:3px solid #ffffff66;border-radius:14px;padding:.4em .8em;background:#ffffff0a}
.bi mark{background:none;color:var(--yellow);border-bottom:3px solid var(--yellow)}
.bi strong{color:var(--pink)}
.frac{display:inline-flex;flex-direction:column;align-items:center;vertical-align:middle;margin:0 .15em;line-height:1.05;font-size:.9em}
.frac .num{border-bottom:.08em solid currentColor;padding:0 .2em}
.frac .den{padding:0 .2em}
.bi-bars{display:flex;flex-direction:column;gap:.45em;margin:.6em 0 .9em}
.bar-row{display:flex;align-items:center;gap:.8em}
.bar{flex:0 0 min(60%,640px);height:1.4em;display:flex;border:3px solid var(--chalk);border-radius:4px}
.bar span{flex:1;border-right:2px solid #f4f1e8aa}
.bar span:last-child{border-right:0}
.bar.c-yellow span.on{background:repeating-linear-gradient(45deg,#ffe08acc 0 6px,#ffe08a88 6px 12px)}
.bar.c-pink span.on{background:repeating-linear-gradient(45deg,#ff9fb4cc 0 6px,#ff9fb488 6px 12px)}
.bar.c-blue span.on{background:repeating-linear-gradient(45deg,#9fd6ffcc 0 6px,#9fd6ff88 6px 12px)}
.bar.c-green span.on{background:repeating-linear-gradient(45deg,#a9eba0cc 0 6px,#a9eba088 6px 12px)}
.bar-label{font-size:.95em}

/* check board */
.chk-tag{display:inline-block;background:var(--yellow);color:#2a2a2a;border-radius:10px;padding:.05em .5em;font-size:.7em;font-weight:700;margin-bottom:.5em;text-shadow:none}
.chk-prompt{font-size:1.25em;margin:.2em 0 .7em}
.chk-opts{display:grid;grid-template-columns:repeat(auto-fit,minmax(min(100%,8em),1fr));gap:.5em}
.chk-opt{border:3px solid #ffffff88;border-radius:14px;padding:.3em .6em}
.chk-opt b{color:var(--yellow);margin-right:.3em}
.chk-hint{color:var(--chalk-dim);font-size:.85em;margin-top:.8em}
.stat{display:grid;grid-template-columns:4em 1fr 3.5em;align-items:center;gap:.5em;font-size:.85em;margin:.25em 0}
.stat .track{height:.9em;background:#ffffff1a;border-radius:6px;overflow:hidden}
.stat .fill{height:100%;background:var(--chalk-dim);border-radius:6px;transition:width .8s}
.stat.correct .fill{background:var(--green)}
.stat.correct .k{color:var(--green)}
.rate-big{font-size:1.1em}
.rate-big b{color:var(--yellow);font-size:1.3em}
.fb-head{margin-top:1em;font-size:1.15em;color:var(--blue);font-weight:700}
.cam-ref{font-size:.75em;color:var(--chalk-dim);border-left:4px solid var(--blue);padding-left:.6em;margin:.5em 0}

/* ---- side ---- */
.side{background:var(--ui-2);border-radius:14px;padding:12px;display:flex;flex-direction:column;gap:10px;min-height:0;overflow:auto}
.cam-box{position:relative;aspect-ratio:16/9;background:#000;border-radius:10px;overflow:hidden}
.cam-box video{width:100%;height:100%;object-fit:cover;display:none}
.cam-box.on video{display:block}
.cam-box.on .cam-off{display:none}
.cam-off{position:absolute;inset:0;display:grid;place-items:center;color:var(--ui-muted);font-size:14px}
.cam-count{position:absolute;inset:0;display:none;place-items:center;font-size:64px;font-weight:700;color:#fff;background:#0006}
.cam-count.on{display:grid}
.cam-box.flash::after{content:"";position:absolute;inset:0;background:#fff;animation:flash .4s forwards}
@keyframes flash{to{opacity:0}}
.side-title{font-weight:700;display:flex;align-items:center;gap:8px}
.timer{margin-left:auto;font-variant-numeric:tabular-nums;color:var(--accent);font-size:20px}
.seat-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:6px}
.seat-grid.large{grid-template-columns:repeat(5,1fr);gap:10px}
.seat{aspect-ratio:1;border-radius:10px;background:var(--ui-3);color:var(--ui-muted);display:flex;flex-direction:column;align-items:center;justify-content:center;
  font-weight:700;font-size:18px;position:relative;transition:background .3s}
.seat small{font-size:10px;font-weight:400;max-width:95%;overflow:hidden;white-space:nowrap;text-overflow:ellipsis}
.seat-grid.large .seat{font-size:26px}
.seat-grid.large .seat small{font-size:13px}
.seat.joined{background:#33475a;color:#dbe7f2}
.seat.answered{background:#3c6fb0;color:#fff}
.seat.pending{background:var(--pend);color:#fff}
.seat.ok{background:var(--ok);color:#fff}
.seat.ng{background:var(--ng);color:#fff}
.legend{display:flex;flex-wrap:wrap;gap:4px 10px;font-size:12px;color:var(--ui-muted)}
.dot{display:inline-block;width:10px;height:10px;border-radius:3px;margin-right:4px;vertical-align:-1px}
.dot.joined{background:#33475a}.dot.answered{background:#3c6fb0}.dot.ok{background:var(--ok)}.dot.ng{background:var(--ng)}
.ai-status{font-size:13px;color:var(--ui-muted);min-height:1.4em;white-space:pre-wrap}
.ai-status.busy::before{content:"";display:inline-block;width:10px;height:10px;border:2px solid var(--accent);border-top-color:transparent;border-radius:50%;
  margin-right:6px;animation:spin 1s linear infinite;vertical-align:-1px}
@keyframes spin{to{transform:rotate(360deg)}}

/* ---- controls ---- */
.controls{display:flex;gap:8px;padding:8px 12px 12px;align-items:center;flex-wrap:wrap}
.controls .sep{flex:1}
.btn{background:var(--ui-3);color:var(--ui-text);border:0;border-radius:10px;padding:10px 16px;font:inherit;font-size:15px;cursor:pointer}
.btn:hover{filter:brightness(1.15)}
.btn.primary{background:var(--accent);color:#2a2100;font-weight:700}
.btn.ghost{background:transparent;border:1px solid var(--ui-3)}
.btn.big{font-size:20px;padding:14px 24px}
.btn.off{opacity:.55}

/* ---- overlays ---- */
.overlay{position:fixed;inset:0;background:#0b0f13ee;display:grid;place-items:center;z-index:20;padding:20px}
.card{max-height:calc(100vh - 40px);overflow:auto;background:var(--ui-2);border-radius:18px;padding:28px 32px;width:min(560px,100%);display:flex;flex-direction:column;gap:14px;box-shadow:0 20px 60px #000a}
.card h1{margin:0;font-family:"LXGW WenKai TC",serif;font-size:32px;color:var(--yellow)}
.card h2{margin:0;font-family:"LXGW WenKai TC",serif;font-size:28px}
.field{display:flex;flex-direction:column;gap:6px;font-size:15px}
.field input,.field select{background:var(--ui);color:var(--ui-text);border:1px solid var(--ui-3);border-radius:10px;padding:10px 12px;font:inherit;font-size:16px}
.check{display:flex;gap:8px;align-items:center;font-size:15px}
.mode-info{font-size:13px;background:var(--ui);border-radius:10px;padding:10px 12px;color:var(--ui-muted);line-height:1.6}
.mode-info b{color:var(--accent)}
.card.join{width:min(1100px,100%);flex-direction:row;gap:36px;align-items:stretch}
.join-left{flex:0 0 340px;display:flex;flex-direction:column;align-items:center;gap:10px;text-align:center}
.join-right{flex:1;display:flex;flex-direction:column;gap:14px}
.join-right .seat-grid{flex:1}
.code-label{color:var(--ui-muted)}
.big-code{font-size:88px;font-weight:800;letter-spacing:.12em;color:var(--yellow);line-height:1}
.qr{background:#fff;padding:12px;border-radius:12px}
.join-url{font-size:13px;color:var(--ui-muted);word-break:break-all}
.toast{position:fixed;left:50%;bottom:90px;transform:translateX(-50%);background:#000d;color:#fff;padding:10px 18px;border-radius:10px;opacity:0;transition:opacity .3s;z-index:30;pointer-events:none}
.toast.on{opacity:1}

@media (max-width:900px){
  .stage{grid-template-columns:1fr}
  .side{max-height:40vh}
  .card.join{flex-direction:column}
  .join-left{flex:none}
}

/* ---- 講課專注模式：收起座位表，黑板佔滿 ---- */
body.focus .stage{grid-template-columns:1fr}
body.focus .side{display:none}
.cam-box:not(.on){display:none}

/* ---- 結果頁左右分欄 ---- */
.split{display:grid;grid-template-columns:minmax(0,5fr) minmax(0,7fr);gap:1.4em;align-items:start}
.split .col{min-width:0}
.col-stats{border-right:3px dashed #ffffff33;padding-right:1.2em}
.col-stats .stat{font-size:.8em}
.chk-prompt.small{font-size:.95em}
.answer-line{margin-top:.6em;font-size:.9em;color:var(--green)}
.col-fb .fb-head{margin-top:0}
.fallback-tag{display:inline-block;margin-left:.6em;font-size:.55em;vertical-align:middle;background:#ff9fb433;color:var(--pink);border:2px solid var(--pink);border-radius:8px;padding:0 .4em;text-shadow:none}
@media (max-width:900px){.split{grid-template-columns:1fr}.col-stats{border-right:0;padding-right:0}}

/* ---- AI 狀態燈與連線測試 ---- */
.badge.ai{cursor:pointer}
.badge.ai::before{content:"";display:inline-block;width:8px;height:8px;border-radius:50%;background:var(--ui-muted);margin-right:6px;vertical-align:1px}
.badge.ai.on::before{background:var(--ok)}
.badge.ai.bad{background:#4a2420;color:#ffb4a8}
.badge.ai.bad::before{background:var(--ng)}
.test-row{display:flex;gap:8px;flex-wrap:wrap}
.test-msg{font-size:14px;line-height:1.6;background:var(--ui);border-radius:10px;padding:10px 12px;white-space:pre-wrap;color:var(--ui-muted)}
.test-msg.ok{color:#9be3b4}
.test-msg.bad{color:#ffb4a8}
.ai-status{white-space:pre-wrap}
.toast{white-space:pre-wrap;max-width:min(720px,90vw);text-align:center}
.subtitle.loading::before{content:"⏳ AI 老師準備聲音中… ";color:var(--yellow)}

/* ---- 聽不懂 ---- */
.btn.alert{background:var(--accent);color:#2a2100;font-weight:700;animation:nudge 1.6s ease-in-out infinite}
@keyframes nudge{50%{transform:translateY(-3px)}}
@media (prefers-reduced-motion:reduce){.btn.alert{animation:none}}

/* ---- 不收影音 ---- */
body.nomedia #snapBtn, body.nomedia .cam-box{display:none}
.check.strong{font-weight:700;color:var(--accent)}
.check.strong .muted{font-weight:400}

/* ---- 搶答賽 ---- */
.g-opts{display:grid;grid-template-columns:1fr 1fr;gap:.5em}
.g-opt{border-radius:14px;padding:.45em .7em;color:#fff;text-shadow:none;font-family:"PingFang TC","Microsoft JhengHei",sans-serif;font-weight:700;display:flex;align-items:center;gap:.5em}
.g-opt b{background:#0003;border-radius:8px;padding:0 .35em}
.g0{background:#d7385e}.g1{background:#2f6fc4}.g2{background:#c58a00}.g3{background:#2e8a52}
.rank-row{display:grid;grid-template-columns:1.6em 1fr auto;gap:.5em;align-items:center;margin:0 0 .3em;font-size:.9em}
.rank-row .rk{background:var(--yellow);color:#2a2a2a;border-radius:50%;width:1.5em;height:1.5em;display:grid;place-items:center;font-size:.8em;font-weight:700;text-shadow:none}
.rank-row .pt{color:var(--yellow);font-variant-numeric:tabular-nums}

/* ---- 外部遊戲 ---- */
.ext{display:flex;gap:1.2em;align-items:center;flex-wrap:wrap}
.ext-qr{background:#fff;padding:14px;border-radius:14px;flex:none}
.ext-qr img,.ext-qr canvas{display:block;width:min(300px,30vh);height:auto}
.ext-info{flex:1;min-width:0}
.ext-host{font-size:1.6em;color:var(--yellow);font-weight:700}
.ext-url{font-size:.5em;color:var(--chalk-dim);word-break:break-all;margin-top:.8em}

/* ---- 點名 / 抄寫 / 作品展示 ---- */
.call-banner{font-size:1.25em;color:var(--yellow);font-weight:700;margin:.1em 0 .3em;animation:chalkIn .7s ease-out both}
.page-tag{display:inline-block;border:3px solid var(--blue);color:var(--blue);border-radius:12px;padding:0 .5em;font-size:.8em;margin-bottom:.4em}
.call-row{display:grid;grid-template-columns:auto 1fr auto;gap:.6em;align-items:center;border:3px solid #ffffff55;border-radius:14px;padding:.3em .6em;margin:.3em 0}
.call-row.ok{border-color:var(--green)}.call-row.ng{border-color:var(--pink)}
.call-row b{color:var(--yellow)}
.call-row i{font-style:normal;font-size:1.2em}
.call-row.ok i{color:var(--green)}.call-row.ng i{color:var(--pink)}
.call-row img{max-height:5em;background:#fff;border-radius:8px}
.seat.called{outline:3px solid var(--accent);outline-offset:-3px}
.seat.has-img{cursor:pointer}
.seat.has-img::before{content:"🖼";position:absolute;top:1px;right:3px;font-size:11px}
.works{display:grid;grid-template-columns:repeat(auto-fit,minmax(0,1fr));gap:.6em}
.work{margin:0;background:#ffffff12;border-radius:14px;padding:.4em;display:flex;flex-direction:column;gap:.3em;border:3px solid transparent;min-width:0}
.work.good{border-color:var(--green)}.work.oops{border-color:#ffffff55}
.work img{width:100%;max-height:38vh;object-fit:contain;background:#fff;border-radius:8px}
.work figcaption{font-size:.62em;line-height:1.4;display:flex;flex-direction:column}
.work figcaption b{color:var(--yellow)}
.work-view{position:fixed;inset:0;background:#000c;z-index:25;display:grid;place-items:center;padding:20px;cursor:pointer}
.work-card{background:var(--ui-2);border-radius:18px;padding:18px;display:flex;flex-direction:column;gap:10px;align-items:center;max-width:min(1000px,96vw)}
.work-card img{max-width:100%;max-height:70vh;background:#fff;border-radius:10px}
.work-cap{font-size:24px;text-align:center}
.work-view[hidden]{display:none}

/* ---- 大倒數 ---- */
.big-timer{position:absolute;top:22px;right:26px;z-index:3;background:#000a;border:4px solid var(--chalk);border-radius:20px;padding:6px 22px 8px;text-align:center;color:#fff;line-height:1.1;pointer-events:none}
.big-timer[hidden]{display:none}
.big-timer span{display:block;font-size:clamp(54px,7vw,110px);font-weight:800;font-variant-numeric:tabular-nums;font-family:"PingFang TC","Microsoft JhengHei",sans-serif}
.big-timer small{font-size:clamp(14px,1.3vw,20px);opacity:.85}
.big-timer.soon{border-color:var(--yellow);color:var(--yellow)}
.big-timer.urgent{border-color:var(--ng);color:#ffb4a8;animation:pulseT 1s infinite}
@keyframes pulseT{50%{transform:scale(1.06)}}
@media (prefers-reduced-motion:reduce){.big-timer.urgent{animation:none}}
/* 有大倒數時，題目區右邊留空，不要被蓋住 */
.frame:has(.big-timer:not([hidden])) .chalkboard{padding-right:clamp(210px,22vw,340px)}

/* ---- 同步狀態 ---- */
.badge.warn{background:#5a4310;color:var(--yellow)}
.seat.lag{outline:3px dashed var(--yellow);outline-offset:-3px}
.seat.lag::after{content:"⏳";position:absolute;bottom:0;right:2px;font-size:12px}
.seat.err{outline:3px solid var(--ng);outline-offset:-3px}
.prep-msg{font-size:14px;color:var(--ui-muted);min-height:1.4em}
.prep-msg.ok{color:#9be3b4}

/* ---- 設定畫面：兩欄排列，一個畫面放得下 ---- */
body{-webkit-user-select:none;user-select:none}
input,select,textarea{-webkit-user-select:text;user-select:text}
#setup .card{width:min(1040px,100%);display:grid;grid-template-columns:1fr 1fr;gap:10px 22px;padding:20px 26px;align-content:start}
#setup .card h1,#setup .card>p,#setup .card #modeInfo,#setup .card #startBtn,#setup .card #libMsg,#setup .card #testMsg{grid-column:1/-1}
#setup .card h1{font-size:26px}
#setup .card>p{margin:0}
#setup .field{font-size:14px;gap:3px}
#setup .field input,#setup .field select{padding:7px 10px;font-size:15px}
#setup .check{font-size:14px}
#setup .mode-info{padding:6px 10px;font-size:12.5px}
#setup .btn.big{font-size:18px;padding:10px 20px}
#setup .test-row .btn{padding:7px 12px;font-size:14px}
@media (max-width:820px){#setup .card{grid-template-columns:1fr}}
#setup .card{grid-template-columns:minmax(0,1fr) minmax(0,1fr);padding:16px 24px;gap:8px 22px}
#setup .field select,#setup .field input{width:100%;min-width:0}
#setup .card h1{margin:0}
/* 控制列放在同一排 */
.controls{gap:6px;padding:6px 12px 10px}
.controls .btn{padding:8px 11px;font-size:14px;white-space:nowrap}
.toast{bottom:auto;top:58px}

/* ---- 板書跟著講解：現在講到的那一行 ---- */
.bi{transition:color .35s,opacity .35s,transform .35s,background .35s}
.bi.said{opacity:.72}
.bi.now{position:relative;background:#ffe08a1f;box-shadow:-10px 0 0 #ffe08a1f,10px 0 0 #ffe08a1f;border-radius:6px;animation:nowPop .5s ease-out}
.bi.now::before{content:"👉";position:absolute;left:-1.25em;top:.05em;font-size:.8em;animation:nudgeX 1s ease-in-out infinite}
.bi.now.bi-text,.bi.now.bi-eq{color:#fff8dc}
@keyframes nowPop{0%{transform:scale(.985);background:#ffe08a55}100%{transform:scale(1)}}
@keyframes nudgeX{50%{transform:translateX(.18em)}}
@media (prefers-reduced-motion:reduce){.bi.now,.bi.now::before{animation:none}}
.subtitle span{opacity:.55;transition:opacity .25s,color .25s}
.subtitle span.cur{opacity:1;color:var(--yellow)}

/* ---- 教室音量 ---- */
.badge.mic{position:relative;width:86px;height:26px;padding:0;overflow:hidden;background:var(--ui-3)}
.badge.mic[hidden]{display:none}
.badge.mic i{position:absolute;left:0;top:0;bottom:0;width:0;background:var(--ok);transition:width .2s}
.badge.mic.loud i{background:var(--ng)}
.badge.mic b{position:absolute;top:0;bottom:0;width:2px;background:#fff;left:60%}
.badge.mic::after{content:"🎤";position:absolute;left:6px;top:3px;font-size:13px}
.hush{position:absolute;left:50%;top:38%;transform:translate(-50%,-50%);z-index:4;background:#000c;color:#fff;border:4px solid var(--yellow);border-radius:22px;padding:.4em 1em;font-size:clamp(28px,4vw,60px);font-weight:800;text-align:center;white-space:nowrap}
.hush[hidden]{display:none}

.chorus-meter{height:1em;border:3px solid var(--chalk);border-radius:999px;overflow:hidden;margin-top:.6em}
.chorus-meter i{display:block;height:100%;width:0;background:var(--green);transition:width .2s}

/* 課程時間預估、管理教材、上課時鐘、等待時間 */
.lesson-info{font-size:13px;color:var(--ui-muted);font-weight:400}
.lesson-info.warn{color:#ffd28a}
.badge.clock.late,.badge.lat.late{background:#4a3a14;color:#ffd28a}
.overlay.top{z-index:30}
.lib-card{width:min(720px,100%)}
#libList{overflow:auto;max-height:56vh;display:flex;flex-direction:column}
.lib-row{display:flex;align-items:center;justify-content:space-between;gap:10px;padding:9px 0;border-top:1px solid #ffffff14}
.lib-row b{display:block;color:var(--ui-text);font-weight:600}
.lib-row small{color:var(--ui-muted)}
.lib-row.off b{opacity:.45}
.lib-row .btn{flex:none;padding:6px 12px;font-size:14px}
.lib-tag{font-style:normal;background:#3a4a2f;color:var(--yellow);border-radius:6px;padding:1px 7px;margin-right:6px;font-size:12px}
.lib-tag.in{background:var(--ui-3);color:var(--ui-muted)}
/* 建立課堂：整個畫面排在一頁內，不用捲動 */
#setup .card{display:flex;flex-direction:column;gap:9px;width:min(1180px,100%);padding:16px 24px}
.setup-head{display:flex;align-items:baseline;gap:14px;flex-wrap:wrap}
.setup-lesson{display:flex;gap:10px;align-items:flex-end}
.setup-lesson .field{flex:1;min-width:0}
.setup-lesson .btn{flex:none;padding:8px 14px;font-size:15px}
.setup-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:8px 18px}
.setup-grid .test-row{align-self:end;display:flex;gap:8px}
.setup-grid .test-row .btn{flex:1}
.setup-checks{display:flex;flex-wrap:wrap;gap:6px 22px;padding:2px 0}
@media (max-width:900px){.setup-grid{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media (max-width:600px){.setup-grid{grid-template-columns:1fr}.setup-lesson{flex-wrap:wrap}}
@media (max-height:720px){#setup .card{gap:6px;padding:12px 22px}#setup .card h1{font-size:22px}#setup .mode-info{font-size:12px;padding:4px 10px}}
/* 佳句欣賞、錄音播放 */
.quotes{display:grid;grid-template-columns:repeat(auto-fit,minmax(0,1fr));gap:.6em}
.quote{margin:0;background:#ffffff12;border:3px solid var(--green);border-radius:14px;padding:.5em .7em;display:flex;flex-direction:column;gap:.35em;min-width:0}
.quote blockquote{margin:0;font-size:1.05em;line-height:1.5}
.quote figcaption{display:flex;flex-direction:column;font-size:.62em;gap:.15em}
.quote figcaption b{color:var(--yellow)}
.call-row.playing{border-color:var(--yellow);box-shadow:0 0 0 4px #ffd95a44;animation:pulse 1s infinite alternate}
@keyframes pulse{from{box-shadow:0 0 0 2px #ffd95a33}to{box-shadow:0 0 0 8px #ffd95a55}}
/* 下方按鈕列固定一排 */
.controls{flex-wrap:nowrap;gap:5px;overflow:hidden}
.controls .btn{padding:8px 9px;font-size:13.5px;flex:0 1 auto;min-width:0}
.controls .sep{min-width:4px}
@media (max-width:1320px){.controls{gap:4px;padding:6px 8px 8px}.controls .btn{padding:7px 7px;font-size:12.5px}}
@media (max-width:1100px){.controls .btn{padding:6px 5px;font-size:11.5px}}
/* 上方狀態列：內容多的時候也排在一排，不互相蓋住 */
.topbar{gap:10px;padding:7px 12px}
.tb-title{flex:0 1 auto;min-width:90px;max-width:30%;overflow:hidden;text-overflow:ellipsis;font-size:17px}
.progress{flex:1 1 80px;min-width:60px}
.tb-right{flex:none;gap:6px;align-items:center}
.tb-right .badge{white-space:nowrap;padding:4px 9px;font-size:13px}
.badge.mic{width:64px;flex:none}
.badge[hidden]{display:none}
@media (max-width:1320px){.tb-right .badge{padding:3px 7px;font-size:12px}.tb-title{font-size:15px;max-width:24%}}
.setup-grid .field,.setup-lesson .field{display:block}
.setup-grid .field input,.setup-grid .field select,.setup-lesson .field select{display:block;margin-top:3px}

/* ---- 頒獎典禮 ---- */
.award{position:absolute;inset:0;display:flex;flex-direction:column;align-items:center;justify-content:flex-end;overflow:hidden;border-radius:inherit;
  background:radial-gradient(ellipse at 50% 110%,#3b2a66 0%,#1a1433 55%,#0c0a1c 100%);z-index:3;padding:0 4% 3%}
.aw-title{position:absolute;top:4%;left:0;right:0;text-align:center;font-family:"LXGW WenKai TC",serif;font-size:clamp(34px,5.2vw,70px);font-weight:700;color:#ffe08a;text-shadow:0 0 24px #ffb30088;animation:awGlow 2s ease-in-out infinite alternate}
@keyframes awGlow{from{text-shadow:0 0 14px #ffb30055}to{text-shadow:0 0 38px #ffd95acc}}
.aw-beams i{position:absolute;top:-10%;width:22%;height:130%;background:linear-gradient(#fff6,#fff0 75%);transform-origin:50% 0;filter:blur(6px);opacity:.35;mix-blend-mode:screen}
.aw-beams i:nth-child(1){left:8%;animation:awSweep 5s ease-in-out infinite alternate}
.aw-beams i:nth-child(2){left:39%;animation:awSweep 6.5s ease-in-out infinite alternate-reverse}
.aw-beams i:nth-child(3){left:70%;animation:awSweep 4.2s ease-in-out infinite alternate}
@keyframes awSweep{from{transform:rotate(-16deg)}to{transform:rotate(16deg)}}
.award.rolling .aw-beams i{animation-duration:.9s;opacity:.55}
.award.rolling .aw-title{animation:awShake .12s linear infinite}
@keyframes awShake{0%{transform:translate(1px,0)}50%{transform:translate(-1px,1px)}100%{transform:translate(1px,-1px)}}
.aw-podium{position:relative;display:flex;align-items:flex-end;justify-content:center;gap:2.2%;width:100%;height:68%}
.aw-col{flex:1 1 0;max-width:30%;display:flex;flex-direction:column;align-items:center;justify-content:flex-end;height:100%}
.aw-block{width:100%;border-radius:14px 14px 0 0;display:grid;place-items:center;color:#0008;font-weight:900;font-size:clamp(40px,6vw,90px);height:0;transition:height .9s cubic-bezier(.2,1.3,.4,1);overflow:hidden}
.aw-col.p1 .aw-block{background:linear-gradient(#ffe27a,#f0a800)}
.aw-col.p2 .aw-block{background:linear-gradient(#eef1f5,#a9b3bf)}
.aw-col.p3 .aw-block{background:linear-gradient(#f3bd8a,#b9743a)}
.aw-col.show.p1 .aw-block{height:58%}.aw-col.show.p2 .aw-block{height:42%}.aw-col.show.p3 .aw-block{height:30%}
.aw-who{display:flex;flex-direction:column;align-items:center;gap:.1em;margin-bottom:.35em;opacity:0;transform:translateY(40px) scale(.4);color:#fff;text-align:center;font-family:"LXGW WenKai TC",serif}
.aw-col.show .aw-who{animation:awPop .8s .35s cubic-bezier(.2,1.7,.4,1) both}
@keyframes awPop{from{opacity:0;transform:translateY(40px) scale(.4)}to{opacity:1;transform:none}}
.aw-medal{font-size:clamp(44px,6.4vw,96px);line-height:1;filter:drop-shadow(0 6px 10px #0008)}
.aw-who b{font-size:clamp(24px,3.3vw,48px);font-weight:700}
.aw-who em{font-style:normal;font-size:clamp(17px,2vw,28px);color:#ffe08a}
.aw-col.p1.show .aw-medal{animation:awSpin 2.4s 1s ease-in-out infinite}
@keyframes awSpin{0%,100%{transform:rotate(-8deg) scale(1)}50%{transform:rotate(8deg) scale(1.12)}}
.award.champion{animation:awFlash .7s ease-out}
@keyframes awFlash{0%{filter:brightness(2.4)}100%{filter:none}}
.award[data-focus="2"]:not(.done) .aw-col.show:not(.p3),.award[data-focus="1"]:not(.done) .aw-col.show:not(.p2){filter:brightness(.75)}
.aw-rest{display:flex;flex-wrap:wrap;gap:.3em 1.4em;justify-content:center;color:#cfd3e6;font-size:clamp(14px,1.5vw,22px);min-height:1.4em;opacity:0;transition:opacity .8s}
.award.done .aw-rest{opacity:1}
.confetti{position:absolute;inset:0;width:100%;height:100%;pointer-events:none;z-index:4}
.chalkboard{position:relative}
.aw-col.p1 .aw-medal{font-size:clamp(56px,8vw,120px)}.aw-col.p1 .aw-who b{font-size:clamp(28px,3.9vw,58px);color:#ffe08a}
/* 算式：像粉筆一筆一筆寫出來 */
.bi-eq.writing{position:relative;-webkit-mask:linear-gradient(90deg,#000 var(--w),transparent calc(var(--w) + 2%));mask:linear-gradient(90deg,#000 var(--w),transparent calc(var(--w) + 2%));animation:none}
/* 重點詞畫圈 */
mark{position:relative}
mark .ring{position:absolute;left:-14%;top:-30%;width:128%;height:160%;overflow:visible;pointer-events:none}
mark .ring path{fill:none;stroke:#ff8fa3;stroke-width:3.2;stroke-linecap:round;vector-effect:non-scaling-stroke;stroke-dasharray:1;stroke-dashoffset:1;animation:ringDraw .7s ease-out forwards;filter:drop-shadow(0 0 2px #0006)}
@keyframes ringDraw{to{stroke-dashoffset:0}}
.bi-eq{width:fit-content;max-width:100%;margin-left:auto;margin-right:auto;padding:0 .3em}
.setup-head .btn.install{margin-left:auto;align-self:center;padding:6px 14px;font-size:14px;background:#3a4a2f;color:var(--yellow)}
/* ---- AI 老師人像 ---- */
.avatar{position:absolute;z-index:2;pointer-events:auto;cursor:pointer;transition:left .9s cubic-bezier(.4,.1,.3,1),top .6s ease,height .6s ease,width .6s ease,opacity .4s;filter:drop-shadow(0 8px 14px #0007)}
.avatar.hidden,.av-window.hidden{display:none}
.av-svg{width:100%;height:100%;overflow:visible}
.av-body{animation:avBreath 3.2s ease-in-out infinite;transform-origin:160px 400px}
@keyframes avBreath{0%,100%{transform:translateY(0)}50%{transform:translateY(-4px)}}
.avatar:not(.aside) .av-body{animation:avBreath 3.2s ease-in-out infinite}
.av-arm{transform-origin:92px 300px;transition:transform .45s cubic-bezier(.3,1.3,.5,1);opacity:0}
.avatar.pointing .av-arm{opacity:1}
.avatar.pointing .av-arm-rest{opacity:.0}

.tip{animation:tipGlow 1s ease-in-out infinite alternate}
@keyframes tipGlow{from{opacity:.6}to{opacity:1}}
.eyes .e-smile,.mouth>*,.cheek,.think,.sweat{display:none}
.avatar .eyes{animation:blink 4.2s infinite;transform-origin:160px 152px}
@keyframes blink{0%,92%,100%{transform:scaleY(1)}95%{transform:scaleY(.1)}}
/* 表情 */
.mood-normal .m-smile,.mood-thinking .m-flat,.mood-stern .m-flat,.mood-sad .m-sad,.mood-surprised .m-o,.mood-happy .m-smile,.mood-laugh .m-laugh{display:block}
.talking.mood-normal .m-smile,.talking.mood-happy .m-smile,.talking.mood-thinking .m-flat,.talking.mood-stern .m-flat,.talking.mood-sad .m-sad{display:none}
.talking.mood-normal .m-talk,.talking.mood-happy .m-talk,.talking.mood-thinking .m-talk,.talking.mood-stern .m-talk,.talking.mood-sad .m-talk{display:block}
.mood-happy .cheek,.mood-laugh .cheek{display:block}
.mood-laugh .e-open{display:none}.mood-laugh .e-smile,.mood-happy.talking .e-smile{display:block}.mood-happy.talking .e-open{display:none}
.mood-laugh .av-head{animation:laughShake .35s ease-in-out infinite;transform-origin:160px 230px}
@keyframes laughShake{0%,100%{transform:rotate(-3deg)}50%{transform:rotate(3deg) translateY(-3px)}}
.mood-surprised .e-open{transform:scale(1.25);transform-origin:160px 152px}
.mood-surprised .brows{transform:translateY(-10px)}
.mood-stern .brow.l{transform:rotate(14deg);transform-origin:133px 124px}.mood-stern .brow.r{transform:rotate(-14deg);transform-origin:187px 124px}
.mood-stern .e-open{transform:scaleY(.7);transform-origin:160px 152px}
.mood-sad .brow.l{transform:rotate(-14deg);transform-origin:133px 124px}.mood-sad .brow.r{transform:rotate(14deg);transform-origin:187px 124px}
.mood-sad .sweat{display:block}
.mood-thinking .think{display:block;animation:thinkBob 1.4s ease-in-out infinite}
.mood-thinking .e-open .eye{transform:translate(4px,-5px)}
.mood-thinking .av-head{transform:rotate(-5deg);transform-origin:160px 230px}
@keyframes thinkBob{0%,100%{transform:translateY(0)}50%{transform:translateY(-6px)}}
/* 窗戶：老師走到旁邊時待的地方 */
.av-window{position:absolute;right:20px;bottom:calc(var(--sub-h,0px) + 26px);width:clamp(120px,12vw,180px);height:clamp(120px,12vw,180px);z-index:4;border-radius:14px 14px 6px 6px;
  background:linear-gradient(#bfe6ff,#e8f6ff 70%);border:8px solid #d9b98a;box-shadow:0 6px 18px #0008,inset 0 0 0 3px #fff6;opacity:0;transform:scale(.6);transition:opacity .4s,transform .4s;pointer-events:none;overflow:hidden}
.av-window.open{opacity:1;transform:none;pointer-events:auto;cursor:pointer}
.av-curtain{position:absolute;top:0;bottom:22%;width:24%;background:repeating-linear-gradient(90deg,#e86a7a 0 6px,#d95467 6px 12px);z-index:1}
.av-curtain.l{left:0;border-radius:0 0 40% 0}.av-curtain.r{right:0;border-radius:0 0 0 40%}
.av-sill{position:absolute;left:-4px;right:-4px;bottom:0;height:16%;background:#c79b62;z-index:3}
.avatar.aside{z-index:5;transition:left .7s ease,top .7s ease,height .6s ease,width .6s ease}
.avatar.aside .av-arm{opacity:0}
.avatar.aside .av-arm-rest{opacity:1}
/* 板書出現的動畫只播一次（避免「亮起／變暗」時又重播一次而閃爍） */
.bi.shown:not(.now){animation:none}
.ver-tag{margin-left:8px;font-size:12px;color:var(--ui-muted);opacity:.8}
#backSetupBtn{margin-top:6px}
#backSetupBtn.hidden{display:none}