/* Nomica · bản chạy thử trình phát (prototype). Dựa trên tokens.css / components.css v0.2. */
*{box-sizing:border-box}
body{margin:0;background:var(--nm-color-bg);color:var(--nm-color-text);font-family:var(--nm-font-body)}
.pl-proto{position:sticky;top:0;z-index:50;background:var(--nm-sun-100);color:var(--nm-sun-900);border-bottom:2px solid var(--nm-sun-400);font:700 13px/1.4 var(--nm-font-ui);text-align:center;padding:6px 12px}
.pl-main{max-width:980px;margin:0 auto;padding:12px 12px 40px}
.pl-head{margin:4px 0 12px}
.pl-back{font:600 14px var(--nm-font-ui);color:var(--nm-color-brand-text);text-decoration:none}
.pl-title{font-family:var(--nm-font-heading);font-size:clamp(22px,4vw,32px);margin:6px 0 6px;line-height:1.15}
.pl-title .nm-bi__vi{font-size:.6em}
.pl-badges{margin:0}
.pl-player{margin:0 auto}
.nm-player__stage{background:#fff}
.pl-board{position:relative;width:100%;aspect-ratio:16/9;container-type:inline-size;overflow:hidden;font-family:var(--nm-font-heading);color:var(--nm-ink-900);background:radial-gradient(circle at 20% 10%,var(--nm-blue-50),#fff 60%)}
.pl-scene-title{position:absolute;left:3%;top:3%;font-weight:800;font-size:3.4cqw;line-height:1.1;text-align:left}
.pl-scene-title small{display:block;font-size:.6em;font-weight:500;color:var(--nm-color-text-secondary);font-family:var(--nm-font-body)}
.el{position:absolute;display:flex;align-items:center;justify-content:center;transition:opacity .35s,transform .5s;transform-origin:center}
.el.is-hidden{opacity:0;pointer-events:none}
.el-text{text-align:center;font-weight:800;line-height:1.05}
.el-text .nm-bi{align-items:center}
.el-text.card{background:var(--nm-color-surface-raised);border:3px solid var(--nm-blue-200);border-radius:18px;padding:0 3%;justify-content:flex-start;text-align:left;box-shadow:var(--nm-shadow-sm)}
.el-text.card .nm-bi{align-items:flex-start}
.el-math{gap:.45em;font-weight:800;line-height:1}
.el-math .dg{display:inline-block;padding:0 .08em;transition:color .4s,-webkit-text-stroke-color .4s}
.el-math.tracing .dg{color:transparent;-webkit-text-stroke:.03em var(--nm-ink-400);text-shadow:none;position:relative}
.el-math.tracing .dg.drawn{color:var(--nm-blue-600);-webkit-text-stroke-color:var(--nm-blue-600);animation:pl-pop .5s}
.el-cg{display:flex;flex-wrap:wrap;align-content:center;justify-content:center;gap:.6cqw}
.el-cg.col{flex-direction:column-reverse;flex-wrap:nowrap;justify-content:flex-start;align-items:center;gap:.25cqw}
.el-cg.col.tower{gap:0;border-bottom:.4cqw solid var(--nm-ink-300);justify-content:flex-start}
.it{position:relative;display:inline-block;flex:none;transition:opacity .25s,transform .25s}
.it svg{width:100%;height:100%;display:block}
.it.is-off{opacity:0;transform:scale(.4)}
.it.pop{animation:pl-pop .45s}
.it .cnt{position:absolute;top:-38%;left:50%;transform:translateX(-50%);background:var(--nm-blue-600);color:#fff;border-radius:999px;font:800 1.6cqw/1.5 var(--nm-font-ui);min-width:2.2cqw;padding:0 .5cqw;text-align:center}
@keyframes pl-pop{0%{transform:scale(.6)}60%{transform:scale(1.18)}100%{transform:scale(1)}}
.el-shape svg{width:100%;height:100%}
/* emphasis */
.el.em{--emc:var(--nm-sun-500)}
.el.em-underline::after{content:"";position:absolute;left:8%;right:8%;bottom:-4%;height:7%;min-height:5px;border-radius:99px;background:var(--emc);animation:pl-grow .4s}
.el.em-circle::after{content:"";position:absolute;inset:-12%;border:.5cqw solid var(--emc);border-radius:50%;animation:pl-pop .45s}
.el.em-box::after{content:"";position:absolute;inset:-6%;border:.45cqw solid var(--emc);border-radius:14px;animation:pl-pop .45s}
.el.em-pulse{animation:pl-pulse 1.4s 1}
.el .arrow{position:absolute;top:-22%;left:50%;width:5cqw;height:5cqw;transform:translateX(-50%);animation:pl-bob .8s infinite alternate}
@keyframes pl-grow{from{transform:scaleX(0)}to{transform:scaleX(1)}}
@keyframes pl-pulse{0%,100%{transform:scale(1)}30%{transform:scale(1.08)}60%{transform:scale(.97)}}
@keyframes pl-bob{from{transform:translate(-50%,0)}to{transform:translate(-50%,-25%)}}
/* guide */
.pl-guide .m{display:none}
.pl-guide[data-expr="happy"] .m-smile,.pl-guide[data-expr="encouraging"] .m-smile{display:block}
.pl-guide[data-expr="excited"] .m-big,.pl-guide[data-expr="celebrate"] .m-big{display:block}
.pl-guide[data-expr="surprised"] .m-o{display:block}
.pl-guide[data-expr="thinking"] .m-flat{display:block}
.pl-guide.g-wave svg,.pl-guide.g-clap svg{animation:pl-wave .5s 3 alternate}
.pl-guide.g-nod svg,.pl-guide.g-thumbs-up svg{animation:pl-nod .4s 3 alternate}
.pl-guide.g-point-left svg{animation:pl-lean .6s 2 alternate}
.pl-guide.g-point-up svg{animation:pl-nod .5s 2 alternate}
@keyframes pl-wave{from{transform:rotate(-6deg)}to{transform:rotate(6deg)}}
@keyframes pl-nod{from{transform:translateY(0)}to{transform:translateY(6%)}}
@keyframes pl-lean{from{transform:translateX(0)}to{transform:translateX(-8%)}}
/* start overlay */
.pl-start{position:absolute;inset:0;z-index:5;display:grid;place-items:center;background:linear-gradient(160deg,rgba(238,241,255,.96),rgba(231,250,244,.96))}
.pl-start[hidden]{display:none}
.pl-start__box{text-align:center;padding:12px}
.pl-start__kicker{margin:0;font:700 14px var(--nm-font-ui);color:var(--nm-color-text-secondary)}
.pl-start__title{margin:4px 0 14px;font:800 clamp(22px,5cqw,44px)/1.1 var(--nm-font-heading)}
.pl-start__title small{font-size:.55em;font-weight:600;color:var(--nm-color-text-secondary)}
.pl-start__note{margin:10px 0 0;font-size:14px;color:var(--nm-color-text-secondary)}
#startBtn{font-size:clamp(18px,3cqw,26px);padding:0 28px;min-height:60px}
/* subtitles */
.pl-subs{z-index:3}
.pl-subs:empty{display:none}
.pl-subs .nm-subs__line.vi-main{font-size:clamp(14px,2vw,22px)}
.pl-subs .pl-novoice{font:600 11px/1.4 var(--nm-font-ui);color:var(--nm-sun-200);background:rgba(14,18,27,.82);padding:1px 8px;border-radius:6px}
/* controls */
.pl-controls{flex-wrap:wrap;row-gap:4px}
.pl-controls .nm-btn{min-width:44px;justify-content:center}
.pl-controls .nm-btn[disabled]{opacity:.35;--_bg:transparent;--_bd:transparent}
#playBtn .ic-pause{display:none}
.pl-player.is-playing #playBtn .ic-pause{display:block}
.pl-player.is-playing #playBtn .ic-play{display:none}
.pl-seek{display:flex;gap:3px;height:14px;background:none;min-width:140px}
.pl-seek button{flex:1;border:0;padding:0;height:10px;margin-top:2px;border-radius:99px;background:rgba(255,255,255,.25);cursor:pointer;position:relative}
.pl-seek button.is-ex{flex:.55;background:rgba(255,255,255,.18)}
.pl-seek button.done{background:var(--nm-sun-400)}
.pl-seek button.cur{background:var(--nm-mint-300);outline:2px solid #fff;outline-offset:1px}
.pl-seek button:focus-visible{outline:3px solid var(--nm-color-focus-ring)}
.pl-sel{display:inline-flex;align-items:center;gap:4px;color:var(--nm-ink-200);font:600 12px var(--nm-font-ui)}
.pl-sel select{min-height:34px;border-radius:999px;border:1px solid rgba(255,255,255,.4);background:var(--nm-ink-800);color:#fff;font:700 12px var(--nm-font-ui);padding:0 8px}
.pl-status{display:flex;flex-wrap:wrap;justify-content:space-between;gap:6px;margin:8px 2px;font:600 13px var(--nm-font-ui);color:var(--nm-color-text-secondary)}
.pl-voice{font-weight:500}
/* exercise panel */
.pl-player[data-mode="ex"] .nm-player__stage,.pl-player[data-mode="ex"] .pl-subs,.pl-player[data-mode="end"] .nm-player__stage,.pl-player[data-mode="end"] .pl-subs{display:none}
.pl-ex{background:var(--nm-color-surface);color:var(--nm-color-text);padding:clamp(12px,3vw,28px);min-height:340px}
.pl-ex[hidden]{display:none}
.pl-ex .nm-q{max-width:720px;margin:0 auto;border:0;box-shadow:none;padding:0}
.pl-exhead{display:flex;justify-content:space-between;align-items:center;gap:8px;font:700 13px var(--nm-font-ui);color:var(--nm-color-text-secondary)}
.pl-stem{display:flex;gap:10px;align-items:flex-start}
.pl-stem .nm-bi__en{font-size:1.1em}
.pl-say{flex:none;width:44px;height:44px;border-radius:50%;border:2px solid var(--nm-color-brand);background:var(--nm-color-brand-soft);color:var(--nm-color-brand-text);cursor:pointer;display:grid;place-items:center}
.pl-vis{display:flex;justify-content:center;align-items:center;min-height:90px;padding:6px}
.pl-vis .it{width:56px;height:56px}
.pl-vis .scatter{position:relative;width:300px;height:170px}
.pl-vis .scatter .it{position:absolute}
.tank{position:relative;width:min(360px,100%);height:170px;border:5px solid var(--nm-blue-300);border-top-width:0;border-radius:0 0 22px 22px;background:linear-gradient(transparent 22%,var(--nm-sky-100) 22%)}
.tank::before{content:"";position:absolute;left:-5px;right:-5px;top:0;height:5px;background:var(--nm-blue-300);border-radius:4px}
.tank .bub{position:absolute;border:2px solid var(--nm-sky-500);border-radius:50%;opacity:.6}
.tank .weed{position:absolute;bottom:0;width:10px;border-radius:10px 10px 0 0;background:var(--nm-mint-400)}
.pl-ex .nm-options{margin-top:4px}
.pl-ex .nm-option{justify-content:flex-start}
.pl-ex .nm-option .big{font:800 1.6em/1 var(--nm-font-heading)}
.pl-ex .nm-option[disabled]{cursor:default}
.pl-actions{display:flex;flex-wrap:wrap;gap:10px;margin-top:6px}
.pl-fb{margin-top:4px}
.pl-fb:empty{display:none}
.pl-fb .nm-alert{flex-direction:column;gap:4px}
.pl-hint{color:var(--nm-color-info-text);background:var(--nm-color-info-soft);border-radius:10px;padding:8px 12px;font-weight:600}
.pl-hint[hidden]{display:none}
/* drag-count */
.dc{display:flex;flex-direction:column;align-items:center;gap:14px}
.dc-tray{display:flex;gap:10px;flex-wrap:wrap;justify-content:center;min-height:72px;padding:6px 10px;border:2px dashed var(--nm-color-border-strong);border-radius:16px;min-width:200px}
.dc-apple{width:64px;height:64px;border:0;background:none;padding:2px;cursor:grab;touch-action:none;border-radius:12px}
.dc-apple:focus-visible{outline:3px solid var(--nm-color-focus-ring)}
.dc-apple.dragging{position:relative;z-index:20;cursor:grabbing;filter:drop-shadow(0 6px 8px rgba(0,0,0,.25))}
.dc-basket{position:relative;width:min(340px,92%);height:150px;display:flex;flex-wrap:wrap;justify-content:center;align-content:flex-end;gap:4px;padding:10px 24px 16px;border:6px solid #8B5E34;border-top:0;border-radius:0 0 60px 60px;background:repeating-linear-gradient(45deg,#F6E3C6 0 12px,#EED3AC 12px 24px)}
.dc-basket::before{content:"";position:absolute;left:-14px;right:-14px;top:-6px;height:12px;border-radius:8px;background:#8B5E34}
.dc-basket.over{box-shadow:0 0 0 5px var(--nm-color-brand-soft-hover)}
.dc-basket .dc-apple{width:52px;height:52px}
.dc-label{font:700 13px var(--nm-font-ui);color:var(--nm-color-text-secondary)}
/* matching */
.mt{display:grid;grid-template-columns:1fr 1fr;gap:12px 28px;max-width:520px;margin:0 auto;width:100%}
.mt-col{display:flex;flex-direction:column;gap:10px}
.mt-item{position:relative;min-height:64px;border:3px solid var(--nm-color-border-strong);border-radius:14px;background:var(--nm-color-surface);font:inherit;cursor:pointer;display:flex;align-items:center;justify-content:center;gap:8px;padding:4px 10px}
.mt-item .big{font:800 1.7em/1 var(--nm-font-heading)}
.mt-item .nm-bi{align-items:center;font-weight:800;font-size:1.15em}
.mt-item.sel{border-color:var(--nm-color-brand);background:var(--nm-color-brand-soft);box-shadow:0 0 0 4px var(--nm-color-brand-soft-hover)}
.mt-item[data-pair]{border-color:var(--pc)}
.mt-item[data-pair]::after{content:attr(data-tag);position:absolute;top:-10px;right:-10px;width:26px;height:26px;border-radius:50%;background:var(--pc);color:#fff;font:800 13px/26px var(--nm-font-ui);text-align:center}
.mt-item[data-result="correct"]{background:var(--nm-color-success-soft);border-color:var(--nm-color-success)}
.mt-item[data-result="wrong"]{background:var(--nm-color-danger-soft);border-color:var(--nm-color-danger)}
/* ordering */
.od-slots,.od-pool{display:flex;flex-wrap:wrap;gap:10px;justify-content:center}
.od-slots{padding:10px;border-radius:16px;background:var(--nm-color-surface-sunken);margin-bottom:12px}
.od-slot,.od-tile{width:62px;height:62px;border-radius:14px;font:800 30px/1 var(--nm-font-heading);display:grid;place-items:center}
.od-slot{border:3px dashed var(--nm-color-border-strong);background:var(--nm-color-surface);cursor:pointer;color:inherit}
.od-slot.filled{border-style:solid;border-color:var(--nm-color-brand);background:var(--nm-color-brand-soft)}
.od-slot[data-result="correct"]{border-color:var(--nm-color-success);background:var(--nm-color-success-soft)}
.od-slot[data-result="wrong"]{border-color:var(--nm-color-danger);background:var(--nm-color-danger-soft)}
.od-tile{border:3px solid var(--nm-color-border-strong);background:var(--nm-color-surface);cursor:pointer;color:inherit;box-shadow:var(--nm-shadow-sm)}
.od-tile.used{visibility:hidden}
.od-arrow{text-align:center;font:600 13px var(--nm-font-ui);color:var(--nm-color-text-secondary);margin:-4px 0 8px}
/* numeric */
.nu{display:flex;flex-direction:column;align-items:center;gap:8px}
.nu .nm-input{width:7em;height:72px;font-size:36px;text-align:center;font-family:var(--nm-font-numeric);font-weight:800}
.nu-hint{min-height:1.4em;font-weight:700;color:var(--nm-color-warning-text)}
/* end */
.pl-end{max-width:640px;margin:0 auto;text-align:center}
.pl-end h2{font-family:var(--nm-font-heading);font-size:clamp(24px,5vw,38px);margin:6px 0}
.pl-stars{font-size:44px;letter-spacing:6px;color:var(--nm-sun-400);line-height:1}
.pl-stars .off{color:var(--nm-ink-200)}
.pl-score{font:800 22px var(--nm-font-ui);margin:8px 0}
.pl-end table{margin:12px auto;text-align:left}
.pl-end .ok{color:var(--nm-color-success-text);font-weight:800}
.pl-end .no{color:var(--nm-color-danger-text);font-weight:800}
.pl-end .skip{color:var(--nm-color-text-muted)}
/* transcript */
.pl-transcript{margin-top:10px;padding:14px 16px}
.pl-transcript h2{font:800 16px var(--nm-font-heading);margin:0 0 6px}
.pl-transcript h2 small{font:500 12px var(--nm-font-ui);color:var(--nm-color-text-secondary)}
.pl-transcript ol{margin:0;padding-left:1.4em;display:flex;flex-direction:column;gap:4px}
.pl-transcript li{cursor:pointer;padding:2px 6px;border-radius:8px}
.pl-transcript li:hover{background:var(--nm-color-surface-sunken)}
.pl-transcript li .sub{display:block;font-size:.85em;color:var(--nm-color-text-secondary)}
.pl-transcript li.cur{background:var(--nm-sun-100)}
.pl-transcript li.cur .main{background:linear-gradient(transparent 55%,var(--nm-sun-300) 55%)}
.pl-transcript li.skipped{opacity:.45;text-decoration:line-through;cursor:default}
.pl-transcript li .lg{font:700 10px var(--nm-font-ui);background:var(--nm-ink-100);border-radius:4px;padding:0 4px;margin-right:4px;vertical-align:middle}
.pl-foot{font-size:13px;color:var(--nm-color-text-secondary);margin-top:14px}
@media (max-width:600px){.pl-main{padding:8px 6px 30px}.pl-sel{font-size:0;gap:0}.pl-sel select{font-size:12px}.pl-vis .it{width:46px;height:46px}.dc-apple{width:56px;height:56px}}
@media (prefers-reduced-motion:reduce){.pl-guide svg,.it.pop,.el .arrow{animation:none!important}}

.el-cg.col .it .cnt{top:50%;left:-42%;transform:translate(-50%,-50%)}
.pl-guide{z-index:4}
.pl-transcript[hidden]{display:none}
/* 25/10 — chuyển lesson-schema f836e21: K4 lựa chọn bằng hình, K2 tô số */
.opt-vis{display:inline-flex;gap:6px;align-items:center}
.opt-vis .it{width:26px;height:26px}
.tr{display:flex;flex-direction:column;align-items:center;gap:8px}
.tr-chips{display:flex;gap:6px}
.tr-chip{min-width:34px;padding:2px 8px;text-align:center;border-radius:999px;border:2px solid var(--nm-color-border-strong);font:800 18px/1.4 var(--nm-font-heading);color:var(--nm-color-text-secondary)}
.tr-chip.cur{border-color:var(--nm-blue-600);color:var(--nm-blue-600)}
.tr-chip.done{background:var(--nm-green-500);border-color:var(--nm-green-500);color:#fff}
.tr-canvas{width:min(260px,80vw);aspect-ratio:260/300;height:auto;border:2px dashed var(--nm-color-border-strong);border-radius:16px;background:#fff;touch-action:none;cursor:crosshair}
.tr-row{display:flex;gap:12px;align-items:center}
.tr-meter{font:700 14px var(--nm-font-ui);color:var(--nm-color-text-secondary)}

/* ================= v2 (25/10 20:15): khung cố định, nhân vật bong bóng, chữ chạy theo giọng, chọn ngôn ngữ bằng pill ================= */
.pl-main{max-width:1240px}
/* chọn ngôn ngữ bài giảng */
.pl-langbar{display:flex;flex-wrap:wrap;align-items:center;gap:6px 12px;margin:0 auto 10px;max-width:var(--fw,100%)}
.pl-langbar__label{font:800 15px var(--nm-font-heading)}
.pl-pills{display:flex;gap:6px;overflow-x:auto;scrollbar-width:thin;-webkit-overflow-scrolling:touch;max-width:100%;padding:2px}
.pl-pill{flex:none;min-height:44px;padding:0 14px;border-radius:999px;border:2px solid var(--nm-color-border-strong);background:var(--nm-color-surface);color:var(--nm-color-text);font:700 14px var(--nm-font-ui);cursor:pointer;white-space:nowrap;display:inline-flex;align-items:center;gap:6px}
.pl-pill:hover{border-color:var(--nm-color-brand);background:var(--nm-color-brand-soft)}
.pl-pill[aria-checked="true"]{background:var(--nm-color-brand);border-color:var(--nm-color-brand);color:var(--nm-color-on-brand)}
.pl-pill:focus-visible{outline:3px solid var(--nm-color-focus-ring);outline-offset:2px}
.pl-pill__def{font:700 10px var(--nm-font-ui);background:var(--nm-sun-200);color:var(--nm-sun-900);border-radius:999px;padding:1px 6px}
.pl-langbar__desc{flex-basis:100%;margin:0;font-size:13px;color:var(--nm-color-text-secondary);min-height:1.4em;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
/* trình phát kích thước cố định */
.pl-player{width:var(--fw,100%);max-width:none;margin:0 auto}
.pl-player .pl-screen{position:relative;height:var(--fh,400px);overflow:hidden;background:#fff}
.pl-player .pl-stage{position:absolute!important;inset:0;aspect-ratio:auto;display:block;background:#fff;overflow:hidden}
.pl-boardwrap{position:absolute;left:var(--bx,0);top:var(--by,0);width:var(--bw,100%);height:var(--bh,100%)}
.pl-player .pl-board{position:absolute;inset:0;width:100%;height:100%;aspect-ratio:auto}
.pl-player .nm-player__stage{container-type:normal}
/* bong bóng nhân vật */
.pl-bubble{position:absolute;right:12px;bottom:12px;width:100px;height:100px;border-radius:50%;overflow:hidden;z-index:4;background:linear-gradient(160deg,var(--nm-blue-100),var(--nm-mint-100));border:3px solid #fff;box-shadow:0 6px 16px rgba(14,18,27,.22);transition:box-shadow .2s}
.pl-bubble svg{width:100%;height:100%;display:block}
.pl-bubble.talking{box-shadow:0 0 0 4px var(--nm-mint-300),0 6px 16px rgba(14,18,27,.22)}
.pl-player[data-narrow] .pl-bubble{width:64px;height:64px;right:8px;bottom:8px;border-width:2px}
/* phụ đề trong khung: dải dưới, chừa chỗ cho bong bóng */
.pl-player .pl-subs{position:absolute;left:3%;right:calc(100px + 30px);bottom:12px;display:flex;flex-direction:column;align-items:center;gap:2px;pointer-events:none;z-index:3}
.pl-player .pl-subs:empty{display:none}
.pl-player[data-narrow] .pl-subs{left:0;right:0;bottom:0;height:var(--sr,64px);justify-content:center;padding:4px 10px;background:var(--nm-ink-950)}
.pl-player[data-narrow] .pl-subs .nm-subs__line{background:transparent;padding:0;font-size:13px;line-height:1.35}
.pl-player[data-narrow] .pl-subs .nm-subs__vi{font-size:11.5px}
.pl-player[data-narrow] .pl-subs .pl-novoice{font-size:10px}
/* chữ chạy theo giọng */
.pl-subs .w{opacity:.16;transition:opacity .12s;border-radius:4px}
.pl-subs .w.read{opacity:1}
.pl-subs .w.cur{opacity:1;background:rgba(255,212,82,.28);box-shadow:inset 0 -3px 0 var(--nm-sun-400)}
@media (prefers-reduced-motion:reduce){.pl-subs .w{opacity:1!important;transition:none}}
/* bài tập / kết quả / màn mở đầu: cuộn TRONG khung */
.pl-player .pl-ex{position:absolute;inset:0;min-height:0;overflow:auto;scroll-behavior:smooth;overscroll-behavior:contain;padding:clamp(10px,2.5vw,24px)}
.pl-player[data-mode="ex"] .pl-stage,.pl-player[data-mode="end"] .pl-stage{display:none}
.pl-player .pl-start{position:absolute;inset:0;overflow:auto}
/* tay kéo đổi cỡ */
.pl-resize{position:absolute;right:0;bottom:0;width:22px;height:22px;z-index:8;cursor:nwse-resize;touch-action:none;background:linear-gradient(135deg,transparent 45%,var(--nm-ink-400) 45% 52%,transparent 52% 64%,var(--nm-ink-400) 64% 71%,transparent 71% 83%,var(--nm-ink-400) 83% 90%,transparent 90%)}
.pl-player[data-size="full"] .pl-resize{display:none}
/* pill trong thanh điều khiển */
.pl-cpills{display:inline-flex;border:1px solid rgba(255,255,255,.35);border-radius:999px;overflow:hidden;flex:none}
.pl-cpills button{min-height:34px;padding:0 10px;border:0;background:transparent;color:#fff;font:700 12px var(--nm-font-ui);cursor:pointer;white-space:nowrap}
.pl-cpills button+button{border-left:1px solid rgba(255,255,255,.2)}
.pl-cpills button[aria-checked="true"]{background:#fff;color:var(--nm-ink-900)}
.pl-cpills button:focus-visible{outline:3px solid var(--nm-color-focus-ring);outline-offset:-3px}
.pl-player .pl-controls{flex-wrap:wrap}
.pl-player .pl-seek{order:0}
.pl-player[data-narrow] .pl-seek{order:-1;flex-basis:100%;margin:4px 0}
/* toàn màn hình (cửa sổ) */
.pl-player[data-size="full"]{position:fixed;inset:0;z-index:100;border-radius:0;width:100vw!important}
body.pl-fs{overflow:hidden}

/* ================= v3 (25/10 21:15): chữ trên bảng gõ như giáo viên viết ================= */
.tw .ch{visibility:hidden}
.tw .ch.on,.el-math .dg.ch.on{visibility:visible}
.el-math .dg.ch{visibility:hidden}
.tw-sr{position:absolute!important;width:1px;height:1px;overflow:hidden;clip:rect(0 0 0 0);clip-path:inset(50%);white-space:nowrap}
.ch{position:relative}
.tw .ch.typo{display:inline-block;white-space:pre;text-align:left;overflow:visible}
.ch.caret::after,.ch.caret-b::before{content:'';position:absolute;top:.08em;bottom:.08em;width:.07em;min-width:2px;background:var(--nm-blue-600);border-radius:1px;animation:tw-blink 1s steps(1) infinite;visibility:visible}
.ch.caret::after{right:-.06em}
.ch.caret-b::before{left:-.04em}
@keyframes tw-blink{50%{opacity:0}}
@media (prefers-reduced-motion:reduce){.ch.caret::after,.ch.caret-b::before{display:none}}

/* ================= v3b (25/10 21:30): soát thiết kế L4/L5/L7 ================= */
/* dải phụ đề cố định ở đáy khung (desktop 116px, điện thoại 96px) → phụ đề không bao giờ đè lên bảng */
.pl-player .pl-subs,.pl-player[data-narrow] .pl-subs{left:0;right:0;bottom:0;height:var(--sr,116px);display:flex;flex-direction:column;align-items:center;justify-content:center;gap:2px;padding:6px calc(100px + 28px) 6px 16px;background:var(--nm-ink-950);overflow:hidden}
.pl-player[data-narrow] .pl-subs{padding:4px 10px}
.pl-player .pl-subs:empty{display:flex}
.pl-player .pl-subs .nm-subs__line{background:transparent;padding:0;line-height:1.3;text-align:center}
.pl-player:not([data-narrow]) .pl-subs .nm-subs__en{font-size:clamp(16px,1.9vw,24px)}
.pl-player:not([data-narrow]) .pl-subs .nm-subs__vi{font-size:clamp(14px,1.5vw,19px)}
.pl-player .pl-subs .pl-novoice{background:transparent}
.pl-player[data-mode="ex"] .pl-subs,.pl-player[data-mode="end"] .pl-subs{display:none}
/* bong bóng: desktop nằm trong dải phụ đề bên phải; điện thoại nằm ở khoảng trống dưới bảng */
.pl-bubble,.pl-player[data-narrow] .pl-bubble{bottom:var(--gb,12px)}
.pl-player:not([data-narrow]) .pl-bubble{right:12px}
/* tay kéo: thanh trượt có focus nhìn thấy được */
.pl-resize:focus-visible{outline:3px solid var(--nm-color-focus-ring);outline-offset:-3px;border-radius:4px}
.pl-player[data-narrow] .pl-resize{display:none}
/* khung nhỏ: thanh ngôn ngữ + thanh điều khiển giữ ≥ 760px (hoặc hết bề ngang trang), màn bài giảng ở giữa */
.pl-player{width:var(--pw,var(--fw,100%))}
.pl-langbar{max-width:var(--pw,var(--fw,100%))}
.pl-player .pl-screen{width:var(--fw,100%);margin:0 auto}
.pl-player[data-size="full"] .pl-screen{width:100%}