@import"https://fonts.googleapis.com/css2?family=Be+Vietnam+Pro:wght@400;500;600;700&family=Lora:ital,wght@0,400;0,500;0,600;1,400&display=swap";.vietmy-lesson-player{--paper: #fbf7ee;--paper-2: #fffdf6;--paper-3: #f5eedc;--ink: #2a2620;--ink-soft: #5b5348;--ink-faint: #6b6153;--ink-dim: #cdc3b0;--line: #e7dfce;--line-2: #d4c9b0;--line-3: #9e8e69;--sun: #ffc23a;--sun-dark: #e09b00;--sun-light: #fff3c4;--sun-ink: #8a5a00;--grass: #5fc377;--grass-dark: #2e7c44;--grass-light: #d8f5dd;--grass-ink: #1f6b3a;--sky: #6fb5ff;--sky-dark: #3a7dc7;--sky-light: #dbe7ff;--sky-ink: #2a5f96;--berry: #ff6b6b;--berry-dark: #a83232;--berry-light: #ffd8d8;--berry-ink: #a83232;--step--2: clamp(.9375rem, .8959rem + .1852vw, 1.0625rem);--step--2-floor: .9375rem;--step--1: clamp(1rem, .9375rem + .2778vw, 1.1875rem);--step-0: clamp(1.0625rem, .9792rem + .3704vw, 1.3125rem);--step-1: clamp(1.1875rem, 1.0833rem + .463vw, 1.5rem);--step-2: clamp(1.3125rem, 1.1667rem + .6481vw, 1.75rem);--step-3: clamp(1.5rem, 1.3125rem + .8333vw, 2.0625rem);--step-4: clamp(1.6875rem, 1.4167rem + 1.2037vw, 2.5rem);--step-5: clamp(1.9375rem, 1.5833rem + 1.5741vw, 3rem);--step-6: clamp(2.25rem, 1.7083rem + 2.4074vw, 3.875rem);--space-1: clamp(.25rem, .2083rem + .1852vw, .375rem);--space-2: clamp(.4375rem, .375rem + .2778vw, .625rem);--space-3: clamp(.625rem, .5208rem + .463vw, .9375rem);--space-4: clamp(.875rem, .7083rem + .7407vw, 1.375rem);--space-5: clamp(1.25rem, 1rem + 1.1111vw, 2rem);--space-6: clamp(1.75rem, 1.375rem + 1.6667vw, 2.875rem);--measure: 68ch;font-family:Nunito,system-ui,sans-serif;color:var(--ink);background:#f0eee9;font-synthesis:none}:where(.vietmy-lesson-player) *{box-sizing:border-box}:where(.vietmy-lesson-player) small{font-size:var(--step--2)}.vietmy-lesson-player{margin:0;min-width:320px;min-height:100vh;background:#f0eee9}:where(.vietmy-lesson-player) button,:where(.vietmy-lesson-player) input{font:inherit;color:inherit}:where(.vietmy-lesson-player) button{-webkit-tap-highlight-color:transparent}:where(.vietmy-lesson-player) button:focus-visible,:where(.vietmy-lesson-player) input:focus-visible,:where(.vietmy-lesson-player) [role=button]:focus-visible{outline:3px solid var(--sky);outline-offset:3px}:where(.vietmy-lesson-player) .eyebrow{margin:0;font:500 var(--step--2)/1.2 "JetBrains Mono",monospace;color:var(--ink-faint);letter-spacing:.12em;text-transform:uppercase}:where(.vietmy-lesson-player) .brand{color:inherit;text-decoration:none;display:flex;gap:10px;align-items:center;font-weight:900}:where(.vietmy-lesson-player) .brand-mark{width:44px;height:44px;display:grid;place-items:center;border:2px solid var(--ink);border-radius:12px 12px 7px;background:var(--sun);box-shadow:0 3px 0 var(--sun-dark);font:900 var(--step-0) "JetBrains Mono";transform:rotate(-2deg)}:where(.vietmy-lesson-player) .brand small{font:500 var(--step--2) "JetBrains Mono";color:var(--ink-faint);letter-spacing:.08em;text-transform:uppercase}:where(.vietmy-lesson-player) .home-shell{min-height:100vh;background:var(--paper);overflow:hidden}:where(.vietmy-lesson-player) .home-nav{max-width:none;margin:auto;min-height:76px;padding:14px max(28px,calc((100% - 1180px)/2));display:flex;justify-content:space-between;align-items:center;border-bottom:1.5px solid var(--line)}:where(.vietmy-lesson-player) .student-pill{display:flex;align-items:center;gap:9px;min-height:44px;padding:5px 12px 5px 5px;border:1.5px solid var(--line-2);background:var(--paper-2);border-radius:999px}:where(.vietmy-lesson-player) .student-pill>span{width:34px;height:34px;display:grid;place-items:center;border-radius:50%;background:var(--sky-light);color:var(--sky-ink);font-weight:900}:where(.vietmy-lesson-player) .student-pill small{color:var(--berry-ink);font-weight:800}:where(.vietmy-lesson-player) .hero-paper{max-width:1180px;margin:24px auto 50px;padding:58px 64px;display:grid;grid-template-columns:1.35fr .65fr;gap:50px;align-items:center;position:relative;border:1.5px solid var(--line-2);border-radius:24px 24px 12px;background:radial-gradient(circle at 75% 15%,rgba(255,194,58,.17),transparent 34%),repeating-linear-gradient(0deg,transparent 0 31px,rgba(42,38,32,.026) 32px),var(--paper-2);box-shadow:0 7px 0 var(--line-2);animation:vietmy-player-paper-in .55s cubic-bezier(.2,.8,.2,1) both}:where(.vietmy-lesson-player) .hero-paper h1{margin:13px 0 14px;font-size:clamp(38px,5vw,66px);line-height:.98;letter-spacing:-.045em}:where(.vietmy-lesson-player) .hero-paper h1 em{color:var(--sun-ink);font-style:normal}:where(.vietmy-lesson-player) .hero-paper>div>p:not(.eyebrow){max-width:570px;margin:0 0 26px;color:var(--ink-soft);font-size:var(--step-0);line-height:1.6}:where(.vietmy-lesson-player) .hero-stack{min-height:230px;position:relative}:where(.vietmy-lesson-player) .paper-card{position:absolute;width:150px;height:172px;display:grid;place-items:center;border:2px solid var(--ink);border-radius:18px 18px 8px;font:900 var(--step-4) "JetBrains Mono";box-shadow:7px 8px #2a262026}:where(.vietmy-lesson-player) .card-one{left:6%;top:36px;background:var(--sky-light);transform:rotate(-10deg)}:where(.vietmy-lesson-player) .card-two{right:6%;top:12px;background:var(--grass-light);transform:rotate(9deg)}:where(.vietmy-lesson-player) .card-three{left:38%;bottom:0;background:var(--sun-light);transform:rotate(2deg)}:where(.vietmy-lesson-player) .button{min-height:44px;border:1.5px solid var(--ink);border-radius:12px;padding:0 18px;cursor:pointer;font-weight:900;transition:transform .15s,box-shadow .15s,background .15s}:where(.vietmy-lesson-player) .button:active:not(:disabled){transform:translateY(3px);box-shadow:none}:where(.vietmy-lesson-player) .button--primary{background:var(--sun);box-shadow:0 4px 0 var(--sun-dark)}:where(.vietmy-lesson-player) .button--good{background:var(--grass);color:var(--ink);box-shadow:0 4px 0 var(--grass-dark)}:where(.vietmy-lesson-player) .button--quiet{background:var(--paper-2);border-color:var(--line-2);box-shadow:0 3px 0 var(--line-2)}:where(.vietmy-lesson-player) .button:disabled{opacity:.45;cursor:not-allowed;box-shadow:none}:where(.vietmy-lesson-player) .roadmap-section{max-width:1180px;margin:auto;padding:0 28px 70px}:where(.vietmy-lesson-player) .section-heading{display:flex;align-items:end;justify-content:space-between;gap:20px;margin-bottom:22px}:where(.vietmy-lesson-player) .section-heading h2{margin:5px 0 0;font-size:var(--step-4)}:where(.vietmy-lesson-player) .grade-tabs{display:flex;gap:5px;border:1.5px solid var(--line-2);padding:4px;border-radius:999px;background:var(--paper-3)}:where(.vietmy-lesson-player) .grade-tabs button{min-height:44px;border:0;border-radius:999px;background:transparent;padding:0 15px;font-weight:800;cursor:pointer}:where(.vietmy-lesson-player) .grade-tabs button.is-active{background:var(--paper-2);box-shadow:0 2px 0 var(--line-2)}:where(.vietmy-lesson-player) .lesson-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:15px}:where(.vietmy-lesson-player) .lesson-card{min-height:300px;position:relative;display:flex;flex-direction:column;align-items:flex-start;padding:20px;border:1.5px solid var(--line-2);border-radius:18px 18px 10px;background:var(--paper-2);box-shadow:0 5px 0 var(--line-2);overflow:hidden;transition:transform .2s,box-shadow .2s,border-color .2s;animation:vietmy-player-card-in .45s both;animation-delay:calc(var(--card-index, 0) * 55ms)}:where(.vietmy-lesson-player) .lesson-card:not(.is-locked):hover{transform:translateY(-4px) rotate(-.25deg);border-color:var(--tone-dark);box-shadow:0 9px 0 var(--line-2)}:where(.vietmy-lesson-player) .lesson-card:before{content:"";position:absolute;inset:0 0 auto;height:7px;background:var(--tone)}:where(.vietmy-lesson-player) .tone-sun{--tone: var(--sun);--tone-light: var(--sun-light);--tone-dark: var(--sun-dark);--tone-ink: var(--sun-ink)}:where(.vietmy-lesson-player) .tone-sky{--tone: var(--sky);--tone-light: var(--sky-light);--tone-dark: var(--sky-dark);--tone-ink: var(--sky-ink)}:where(.vietmy-lesson-player) .tone-grass{--tone: var(--grass);--tone-light: var(--grass-light);--tone-dark: var(--grass-dark);--tone-ink: var(--grass-ink)}:where(.vietmy-lesson-player) .tone-berry{--tone: var(--berry);--tone-light: var(--berry-light);--tone-dark: var(--berry-dark);--tone-ink: var(--berry-ink)}:where(.vietmy-lesson-player) .lesson-number{position:absolute;right:14px;top:14px;font:500 var(--step--2) "JetBrains Mono";color:var(--ink-faint)}:where(.vietmy-lesson-player) .lesson-icon{width:54px;height:54px;margin:7px 0 15px;display:grid;place-items:center;border-radius:16px;background:var(--tone-light);color:var(--tone-ink);font-size:var(--step-2);font-weight:900}:where(.vietmy-lesson-player) .lesson-card h3{margin:7px 0;font-size:var(--step-1);line-height:1.2}:where(.vietmy-lesson-player) .lesson-card>p:not(.eyebrow){margin:0 0 16px;color:var(--ink-soft);font-size:var(--step--1);line-height:1.5}:where(.vietmy-lesson-player) .lesson-tags{margin:-7px 0 12px;display:flex;flex-wrap:wrap;gap:4px}:where(.vietmy-lesson-player) .lesson-tags span{padding:3px 7px;border-radius:999px;background:var(--tone-light);color:var(--tone-ink);font:500 var(--step--2) "JetBrains Mono"}:where(.vietmy-lesson-player) .lesson-card>button{margin-top:auto;min-height:44px;border:0;padding:0;background:none;color:var(--tone-ink);font-weight:900;cursor:pointer}:where(.vietmy-lesson-player) .lesson-card.is-locked{opacity:.58;box-shadow:none}:where(.vietmy-lesson-player) .locked-label{margin-top:auto;color:var(--ink-faint);font-size:var(--step--2);font-weight:800}:where(.vietmy-lesson-player) .mini-progress{width:100%;height:5px;margin-top:9px;background:var(--line);border-radius:999px;overflow:hidden}:where(.vietmy-lesson-player) .mini-progress span{display:block;height:100%;background:var(--tone)}:where(.vietmy-lesson-player) .progress-copy{width:100%;margin-top:11px;display:flex;justify-content:space-between;color:var(--ink-faint);font:500 var(--step--2) "JetBrains Mono"}:where(.vietmy-lesson-player) .sync-note{min-height:36px;margin:-9px 0 16px;display:flex;align-items:center;gap:8px;color:var(--ink-faint);font-size:var(--step--1)}:where(.vietmy-lesson-player) .sync-note button{min-height:44px;border:0;padding:0 10px;border-radius:8px;background:var(--paper-3);color:var(--sky-ink);cursor:pointer;font-weight:800}:where(.vietmy-lesson-player) .sync-dot{width:8px;height:8px;border-radius:50%;background:var(--sun);box-shadow:0 0 0 4px var(--sun-light);animation:vietmy-player-sync-pulse 1.2s infinite}:where(.vietmy-lesson-player) .empty-catalog{grid-column:1/-1;padding:34px;border:1.5px dashed var(--line-2);border-radius:16px;color:var(--ink-soft);text-align:center;background:var(--paper-2)}:where(.vietmy-lesson-player) .home-footer{min-height:85px;padding:20px;display:flex;gap:15px;justify-content:center;align-items:center;background:var(--ink);color:var(--paper)}:where(.vietmy-lesson-player) .home-footer span{color:var(--ink-dim)}:where(.vietmy-lesson-player) .lesson-page{height:100dvh;min-height:0;overflow:hidden;padding:24px;display:grid;place-items:center;background:radial-gradient(circle at 20% 5%,rgba(111,181,255,.12),transparent 27%),#f0eee9}:where(.vietmy-lesson-player) .lesson-frame{width:min(1160px,100%);height:min(760px,calc(100dvh - 48px));min-height:0;display:flex;flex-direction:column;overflow:hidden;border:1.5px solid var(--line-2);border-radius:22px;background:var(--paper);box-shadow:0 8px #d8cfbd}:where(.vietmy-lesson-player) .lesson-header{min-height:64px;display:flex;align-items:center;gap:18px;padding:10px 15px;border-bottom:1.5px solid var(--line);background:var(--paper-2)}:where(.vietmy-lesson-player) .icon-button{width:44px;height:44px;border:1.5px solid var(--line-2);border-radius:12px;background:var(--paper-2);cursor:pointer;font-size:var(--step-3);box-shadow:0 2px 0 var(--line-2)}:where(.vietmy-lesson-player) .step-progress{flex:1;display:flex;gap:5px}:where(.vietmy-lesson-player) .step-progress span{flex:1;max-width:70px;height:7px;border-radius:999px;background:var(--line)}:where(.vietmy-lesson-player) .step-progress .is-done{background:var(--grass)}:where(.vietmy-lesson-player) .step-progress .is-current{background:var(--sun);box-shadow:inset 0 0 0 1px var(--sun-dark)}:where(.vietmy-lesson-player) .status-pill{min-height:36px;display:flex;align-items:center;gap:7px;padding:0 10px;border-radius:999px;border:1px solid var(--line-2);color:var(--ink-faint);font:500 var(--step--2) "JetBrains Mono";letter-spacing:.04em}:where(.vietmy-lesson-player) .status-pill__mark{display:none}:where(.vietmy-lesson-player) .status-pill i{width:8px;height:8px;border-radius:50%;background:var(--ink-dim)}:where(.vietmy-lesson-player) .status-online i{background:var(--grass)}:where(.vietmy-lesson-player) .status-offline i,:where(.vietmy-lesson-player) .status-error i{background:var(--berry)}:where(.vietmy-lesson-player) .status-connecting i,:where(.vietmy-lesson-player) .status-loading i,:where(.vietmy-lesson-player) .status-reconnecting i{background:var(--sun)}:where(.vietmy-lesson-player) .milestones{min-height:58px;padding:9px 20px;display:flex;justify-content:center;gap:5px;border-bottom:1.5px solid var(--line);background:var(--paper-3)}:where(.vietmy-lesson-player) .milestones>div{min-width:140px;display:flex;align-items:center;gap:7px;color:var(--ink-faint);font-size:var(--step--2)}:where(.vietmy-lesson-player) .milestones span{width:27px;height:27px;display:grid;place-items:center;border:1.5px solid var(--line-2);border-radius:50%;background:var(--paper-2);font-size:var(--step--2)}:where(.vietmy-lesson-player) .milestones .is-done{color:var(--grass-ink)}:where(.vietmy-lesson-player) .milestones .is-done span{background:var(--grass-light);border-color:var(--grass-dark)}:where(.vietmy-lesson-player) .milestones .is-current{color:var(--ink)}:where(.vietmy-lesson-player) .milestones .is-current span{background:var(--sun);border-color:var(--sun-dark)}:where(.vietmy-lesson-player) .lesson-layout{flex:1;min-height:0;display:grid;grid-template-columns:minmax(0,1fr) 330px}:where(.vietmy-lesson-player) .stage-column{min-width:0;min-height:0;overflow:hidden;padding:18px 20px;display:flex;flex-direction:column;gap:10px}:where(.vietmy-lesson-player) .lesson-context{display:flex;align-items:baseline;justify-content:space-between;gap:20px;color:var(--ink-faint);font-size:var(--step--2);line-height:1.35}:where(.vietmy-lesson-player) .lesson-context span{font:500 var(--step--2)/1.35 "JetBrains Mono";text-transform:uppercase;letter-spacing:.07em}:where(.vietmy-lesson-player) .lesson-preview-notice{width:fit-content;max-width:100%;min-height:32px;padding:5px 10px;display:flex;flex-wrap:wrap;align-items:center;gap:6px 10px;border:1.5px solid var(--sun-dark);border-radius:999px;background:var(--sun-light);color:var(--sun-ink);font:700 var(--step--2) "JetBrains Mono";letter-spacing:.04em}:where(.vietmy-lesson-player) .lesson-preview-notice span{padding-left:10px;border-left:1px solid currentColor}:where(.vietmy-lesson-player) .prompt-block h1{margin:var(--space-2) 0 0;font-size:var(--step-4);line-height:1.18;letter-spacing:-.02em}:where(.vietmy-lesson-player) .widget-stage{flex:1;min-height:0;overflow:auto;display:grid;place-items:center;padding:var(--space-4);border:1.5px solid var(--line);border-radius:16px;background:var(--paper-2);transition:.2s}:where(.vietmy-lesson-player) .widget-stage.is-won,:where(.vietmy-lesson-player) .widget-stage.is-recap{border-color:var(--grass-dark);background:var(--grass-light)}:where(.vietmy-lesson-player) .widget-stage.is-milestone{border-color:var(--sun-dark);background:var(--sun-light)}:where(.vietmy-lesson-player) .prompt-audio{display:block;width:100%;max-width:320px;height:44px;margin:10px 0 0}:where(.vietmy-lesson-player) .teacher-panel{width:300px;min-height:0;padding:14px;display:flex;flex-direction:column;gap:10px;border-left:1.5px solid var(--line);background:var(--paper-2)}:where(.vietmy-lesson-player) .stage-column>.teacher-panel{display:none}:where(.vietmy-lesson-player) .teacher-scene{height:160px;position:relative;display:grid;place-items:center;border:1.5px solid var(--sky-dark);border-radius:15px;overflow:hidden;background:radial-gradient(circle at 50% 25%,#fff 0 12%,transparent 45%),linear-gradient(var(--sky-light) 0 66%,var(--grass-light) 66%)}:where(.vietmy-lesson-player) .teacher-scene:after{content:"";position:absolute;bottom:38px;width:90px;height:2px;background:var(--ink-faint);transform:rotate(-8deg)}:where(.vietmy-lesson-player) .teacher-scene small{position:absolute;right:7px;bottom:6px;color:var(--ink-faint);font-size:var(--step--2)}:where(.vietmy-lesson-player) .teacher-avatar{width:78px;height:94px;z-index:1;display:flex;flex-direction:column;justify-content:center;align-items:center;border:2px solid var(--ink);border-radius:42% 42% 18px 18px;background:var(--sun-light);box-shadow:4px 5px #2a26202e;transform:rotate(-2deg)}:where(.vietmy-lesson-player) .teacher-avatar span{color:var(--sun-ink);font-size:var(--step-3)}:where(.vietmy-lesson-player) .teacher-avatar b{font:900 var(--step-0) "JetBrains Mono"}:where(.vietmy-lesson-player) .teacher-bubble{padding:11px 13px;border:1.5px solid var(--sky-dark);border-radius:13px 13px 13px 4px;background:var(--sky-light);font-size:var(--step-0);line-height:1.45;font-weight:700}:where(.vietmy-lesson-player) .teacher-bubble.is-win{border-color:var(--grass-dark);background:var(--grass-light)}:where(.vietmy-lesson-player) .conversation{flex:1;min-height:80px;overflow-y:auto;display:flex;flex-direction:column;gap:7px}:where(.vietmy-lesson-player) .conversation div{padding:8px 10px;border:1px solid var(--line-2);border-radius:10px;background:var(--paper);font-size:var(--step--2)}:where(.vietmy-lesson-player) .conversation div span{margin-right:7px;font:500 var(--step--2) "JetBrains Mono";color:var(--ink-faint)}:where(.vietmy-lesson-player) .conversation p{color:var(--ink-faint);font-size:var(--step--1)}:where(.vietmy-lesson-player) .ask-button{min-height:44px;border:1.5px solid var(--line-2);border-radius:12px;background:var(--paper-3);font-weight:800}:where(.vietmy-lesson-player) .ask-button small{color:var(--ink-faint)}:where(.vietmy-lesson-player) .desktop-teacher-chat{width:330px;min-height:0;border-left:1.5px solid var(--line)}:where(.vietmy-lesson-player) .mode-strip{display:none}:where(.vietmy-lesson-player) .mobile-teacher-chat{display:none}:where(.vietmy-lesson-player) .action-bar{display:flex;align-items:center;justify-content:space-between;gap:12px;min-height:58px}:where(.vietmy-lesson-player) .action-bar.is-win{margin:0 -22px -22px;padding:14px 22px 17px;border-top:1.5px solid var(--grass-dark);background:var(--grass-light)}:where(.vietmy-lesson-player) .win-copy{display:flex;align-items:center;gap:10px}:where(.vietmy-lesson-player) .win-copy>span{width:42px;height:42px;display:grid;place-items:center;border-radius:50%;background:var(--grass);border:1.5px solid var(--grass-dark);font-size:var(--step-1)}:where(.vietmy-lesson-player) .win-copy div{display:flex;flex-direction:column}:where(.vietmy-lesson-player) .win-copy small{color:var(--grass-ink)}:where(.vietmy-lesson-player) .action-note{width:100%;color:var(--grass-ink);text-align:center;font-size:var(--step--1);font-weight:800}:where(.vietmy-lesson-player) .notice{width:100%;padding:10px 13px;display:flex;flex-direction:column;border:1.5px solid;border-radius:12px;font-size:var(--step--1)}:where(.vietmy-lesson-player) .notice--berry{border-color:var(--berry-dark);background:var(--berry-light)}:where(.vietmy-lesson-player) .notice--sun{border-color:var(--sun-dark);background:var(--sun-light)}:where(.vietmy-lesson-player) .notice>button{align-self:flex-start;min-height:44px;margin-top:8px;padding:0 12px;border:1.5px solid currentColor;border-radius:999px;background:var(--paper-2);cursor:pointer;font-weight:800}:where(.vietmy-lesson-player) .choice-grid{width:100%;display:grid;grid-template-columns:repeat(var(--columns),minmax(0,1fr));gap:var(--space-3)}:where(.vietmy-lesson-player) .choice-card{min-height:72px;padding:var(--space-3);border:2px solid 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.order-controls{display:flex;gap:5px}:where(.vietmy-lesson-player) .order-controls button{min-width:44px;padding:0}:where(.vietmy-lesson-player) .order-controls button:disabled{opacity:.35;cursor:not-allowed}:where(.vietmy-lesson-player) .classify-bins{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:var(--space-3)}:where(.vietmy-lesson-player) .classify-bin{min-height:120px;padding:var(--space-2);border:2px dashed var(--line-2);border-radius:14px;background:var(--paper-2)}:where(.vietmy-lesson-player) .classify-bin.is-ready{border-color:var(--sky-dark);background:var(--sky-light)}:where(.vietmy-lesson-player) .classify-bin__target{width:100%;padding:7px}:where(.vietmy-lesson-player) .classify-bin__items{margin-top:8px;display:flex;flex-wrap:wrap;justify-content:center;gap:6px}:where(.vietmy-lesson-player) .retell-question{font-size:var(--step-1);font-weight:900}:where(.vietmy-lesson-player) .retell-input{min-height:130px;padding:var(--space-3);border:2px solid var(--line-2);border-radius:12px;background:#fff;resize:vertical;font-size:var(--step-0);line-height:1.5}:where(.vietmy-lesson-player) .retell-widget.is-long-response .retell-input{min-height:220px}:where(.vietmy-lesson-player) .retell-input:focus-visible{outline:3px solid var(--sky);outline-offset:3px}:where(.vietmy-lesson-player) .retell-meta{display:flex;justify-content:space-between;gap:10px;color:var(--ink-faint);font-size:var(--step--1)}:where(.vietmy-lesson-player) .retell-meta .is-ready{color:var(--grass-ink);font-weight:800}:where(.vietmy-lesson-player) .hotspot-widget,:where(.vietmy-lesson-player) .sketch-widget{width:min(100%,680px);display:flex;flex-direction:column;gap:var(--space-3)}:where(.vietmy-lesson-player) .hotspot-stage{position:relative;width:100%;overflow:hidden;border:1.5px solid var(--line-2);border-radius:14px;background:var(--paper-3)}:where(.vietmy-lesson-player) .hotspot-stage__image{display:block;width:100%;max-height:400px;object-fit:contain}:where(.vietmy-lesson-player) .hotspot-marker{position:absolute;left:var(--spot-x);top:var(--spot-y);transform:translate(-50%,-50%);width:46px;height:46px;padding:0;border:3px dashed var(--sky-dark);border-radius:50%;background:#fffdf6d1;box-shadow:0 2px #2a26202e;cursor:pointer;font-weight:900}:where(.vietmy-lesson-player) .hotspot-marker.is-selected{border-style:solid;background:var(--sky-light);color:var(--sky-ink)}:where(.vietmy-lesson-player) .hotspot-marker.is-wrong{border-color:var(--berry-dark);background:var(--berry-light);color:var(--berry-ink)}:where(.vietmy-lesson-player) .sketch-board{position:relative;min-height:260px;overflow:hidden;touch-action:none;cursor:crosshair;border:1.5px solid var(--line-2);border-radius:14px;background:repeating-linear-gradient(0deg,rgba(184,170,138,.16) 0 1px,transparent 1px 26px),repeating-linear-gradient(90deg,rgba(184,170,138,.16) 0 1px,transparent 1px 26px),var(--paper-2)}:where(.vietmy-lesson-player) .sketch-board__background,:where(.vietmy-lesson-player) .sketch-board__ink{position:absolute;inset:0;width:100%;height:100%}:where(.vietmy-lesson-player) .sketch-board__background{object-fit:contain;opacity:.55}:where(.vietmy-lesson-player) .sketch-board__ink{pointer-events:none}:where(.vietmy-lesson-player) .sketch-board__ink polyline{stroke:var(--ink);stroke-width:3;stroke-linecap:round;stroke-linejoin:round}:where(.vietmy-lesson-player) .sketch-board__hint{position:absolute;inset:0;display:grid;place-items:center;margin:0;color:var(--ink-faint);pointer-events:none}:where(.vietmy-lesson-player) .sketch-tools{display:flex;justify-content:center;gap:8px}:where(.vietmy-lesson-player) .sketch-tools button{min-height:44px;padding:0 14px;border:1.5px solid var(--line-2);border-radius:11px;background:var(--paper-2);box-shadow:0 3px 0 var(--line-2);cursor:pointer;font-weight:800}:where(.vietmy-lesson-player) .sketch-tools button:disabled{opacity:.45;cursor:not-allowed;box-shadow:none}:where(.vietmy-lesson-player) .teach-widget{width:100%;display:grid;gap:var(--space-4)}:where(.vietmy-lesson-player) .teach-heading{display:flex;align-items:center;justify-content:space-between;gap:10px;flex-wrap:wrap}:where(.vietmy-lesson-player) .teach-heading>span{min-height:28px;padding:5px 9px;display:inline-flex;align-items:center;border:1.5px solid var(--sky-dark);border-radius:999px;background:var(--sky-light);color:var(--sky-ink);font:800 var(--step--2) "JetBrains Mono";letter-spacing:.07em}:where(.vietmy-lesson-player) .teach-heading>div{display:flex;gap:5px}:where(.vietmy-lesson-player) .teach-heading [role=tab]{padding:5px 8px;border:1.5px solid var(--line-2);border-radius:999px;background:var(--paper-2);color:var(--ink-faint);font:700 var(--step--2) "JetBrains Mono"}:where(.vietmy-lesson-player) .teach-heading [role=tab][aria-selected=true]{border-color:var(--sky-dark);background:var(--sky-light);color:var(--sky-ink)}:where(.vietmy-lesson-player) .teach-probe-question{margin:0;font-size:var(--step-1);line-height:1.4;font-weight:900}:where(.vietmy-lesson-player) .teach-options{display:flex;flex-wrap:wrap;gap:var(--space-3)}:where(.vietmy-lesson-player) .teach-option{min-height:44px;padding:var(--space-2) var(--space-4);border:2px solid var(--line-2);border-radius:12px;background:var(--paper-2);box-shadow:0 3px 0 var(--line-2);cursor:pointer;font-weight:800}:where(.vietmy-lesson-player) .teach-option.is-selected{border-color:var(--sky-dark);background:var(--sky-light);box-shadow:none}:where(.vietmy-lesson-player) .teach-option:disabled{opacity:1;cursor:default}:where(.vietmy-lesson-player) .teach-option:disabled:not(.is-selected){opacity:.58}:where(.vietmy-lesson-player) .teach-prompt{margin:0;color:var(--ink-faint);font-size:var(--step--1)}:where(.vietmy-lesson-player) .teach-reveal{padding:var(--space-3) var(--space-4);display:flex;align-items:flex-start;gap:var(--space-3);border:2px solid var(--sky-dark);border-radius:14px;background:var(--sky-light);box-shadow:0 3px 0 var(--sky-dark)}:where(.vietmy-lesson-player) .teach-reveal__icon{font-size:var(--step-1)}:where(.vietmy-lesson-player) .teach-reveal__content{min-width:0;display:grid;gap:10px}:where(.vietmy-lesson-player) .teach-reveal__content>strong{color:var(--sky-ink);font:900 var(--step--1) "JetBrains Mono";letter-spacing:.05em;text-transform:uppercase}:where(.vietmy-lesson-player) .teach-reveal__content p{margin:0;font-weight:800;line-height:1.45}:where(.vietmy-lesson-player) .teach-reveal__theory{font-size:var(--step-0)}:where(.vietmy-lesson-player) .teach-reveal__content img{max-width:100%;max-height:260px;object-fit:contain;border-radius:10px}:where(.vietmy-lesson-player) .teach-reveal__content audio{width:min(100%,360px)}:where(.vietmy-lesson-player) .widget-stage{container-type:size}:where(.vietmy-lesson-player) .teach-scene{display:grid;gap:8px}:where(.vietmy-lesson-player) .teach-scene__stage{display:block;width:100%;aspect-ratio:16 / 9;min-height:min(24rem,calc(100cqh - 52px));max-height:calc(100cqh - 52px);border:2px solid var(--sky-dark);border-radius:12px;background:var(--paper-2)}:where(.vietmy-lesson-player) .teach-scene__play{justify-self:start;min-width:44px;min-height:44px;padding:0 16px;border:2px solid var(--sky-dark);border-radius:12px;background:var(--paper);box-shadow:0 3px 0 var(--sky-dark);cursor:pointer;font:900 var(--step-0) Nunito,sans-serif;color:var(--sky-ink)}:where(.vietmy-lesson-player) .read-widget{width:min(100%,760px);display:grid;gap:var(--space-4)}:where(.vietmy-lesson-player) .read-passage{display:grid;gap:var(--space-4)}:where(.vietmy-lesson-player) .read-passage-part{display:grid;gap:12px}:where(.vietmy-lesson-player) .read-passage-part>p{margin:0;font-size:var(--step-0);line-height:1.7}:where(.vietmy-lesson-player) .read-eyebrow{margin:0;color:var(--sky-ink);font:500 var(--step--2) "JetBrains Mono",monospace;letter-spacing:.08em;text-transform:uppercase}:where(.vietmy-lesson-player) .read-question{padding:var(--space-3);display:grid;gap:var(--space-3);border:1.5px solid var(--line-2);border-radius:13px;background:var(--paper)}:where(.vietmy-lesson-player) .read-question.is-wrong{border-color:var(--berry-dark);background:var(--berry-light)}:where(.vietmy-lesson-player) .read-question h3{margin:0;font-size:var(--step-0)}:where(.vietmy-lesson-player) .read-question-number{margin:0;color:var(--sun-ink);font:700 var(--step--2) "JetBrains Mono",monospace;text-transform:uppercase}:where(.vietmy-lesson-player) .read-choice-list{display:grid;gap:7px}:where(.vietmy-lesson-player) .read-choice{min-height:44px;padding:8px 11px;display:flex;align-items:center;gap:9px;border:1.5px solid var(--line-2);border-radius:10px;background:var(--paper-2);cursor:pointer;text-align:left;font-weight:800}:where(.vietmy-lesson-player) .read-choice>span{width:25px;height:25px;display:grid;place-items:center;border-radius:50%;background:var(--paper-3);font:700 var(--step--2) "JetBrains Mono",monospace}:where(.vietmy-lesson-player) .read-choice.is-selected{border-color:var(--sky-dark);background:var(--sky-light)}:where(.vietmy-lesson-player) .read-answer-input{min-height:44px;padding:9px 11px;border:1.5px solid var(--line-2);border-radius:10px;background:#fff;font:700 var(--step-0)/1.4 Nunito,sans-serif}:where(.vietmy-lesson-player) .read-answer-input--long{min-height:100px;resize:vertical}:where(.vietmy-lesson-player) .read-question-feedback{margin:0;color:var(--berry-ink);font-size:var(--step--1);font-weight:800}:where(.vietmy-lesson-player) .read-vocab{padding:13px 16px;border:1.5px dashed var(--grass-dark);border-radius:14px;background:var(--grass-light)}:where(.vietmy-lesson-player) .read-vocab h3{margin:0 0 8px}:where(.vietmy-lesson-player) .read-vocab dl{margin:0;display:grid;gap:7px}:where(.vietmy-lesson-player) .read-vocab dl div{display:grid;grid-template-columns:minmax(80px,auto) 1fr;gap:10px}:where(.vietmy-lesson-player) .read-vocab dt{font-weight:900}:where(.vietmy-lesson-player) .read-vocab dd{margin:0;color:var(--ink-soft)}:where(.vietmy-lesson-player) .flashcard-widget{width:min(100%,760px);display:grid;gap:var(--space-3)}:where(.vietmy-lesson-player) .flashcard-header{display:flex;align-items:flex-end;justify-content:space-between;gap:14px}:where(.vietmy-lesson-player) .flashcard-header h2{margin:4px 0 0;font-size:var(--step-1)}:where(.vietmy-lesson-player) .flashcard-progress{margin:0;display:flex;flex-direction:column;text-align:right}:where(.vietmy-lesson-player) .flashcard-progress strong{font:900 var(--step-2) "JetBrains Mono",monospace;color:var(--grass-ink)}:where(.vietmy-lesson-player) .flashcard-progress span{color:var(--ink-faint);font-size:var(--step--2)}:where(.vietmy-lesson-player) .flashcard-widget progress{width:100%;accent-color:var(--grass)}:where(.vietmy-lesson-player) .flashcard-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(145px,1fr));gap:var(--space-3)}:where(.vietmy-lesson-player) .flashcard{min-width:0;padding:8px;display:grid;gap:7px;border:2px solid var(--line-2);border-radius:14px;background:var(--paper-2)}:where(.vietmy-lesson-player) .flashcard.is-read{border-color:var(--grass-dark);background:var(--grass-light)}:where(.vietmy-lesson-player) .flashcard.is-wrong{border-color:var(--berry-dark);background:var(--berry-light)}:where(.vietmy-lesson-player) .flashcard-flip{min-height:130px;padding:8px;border:0;border-radius:10px;background:transparent;cursor:pointer}:where(.vietmy-lesson-player) .flashcard-face{height:100%;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:8px}:where(.vietmy-lesson-player) .flashcard-face img{width:100%;max-height:95px;object-fit:contain;border-radius:8px}:where(.vietmy-lesson-player) .flashcard-face--back strong{font-size:var(--step-2)}:where(.vietmy-lesson-player) .flashcard-face--back>span{color:var(--grass-ink);font-size:var(--step--2);font-weight:800}:where(.vietmy-lesson-player) .flashcard-placeholder{width:64px;height:64px;display:grid;place-items:center;border:1.5px dashed var(--sky-dark);border-radius:13px;background:var(--sky-light);font-size:var(--step-3);font-weight:900}:where(.vietmy-lesson-player) .flashcard audio{width:100%;height:44px}:where(.vietmy-lesson-player) .speak-widget,:where(.vietmy-lesson-player) .rhythm-widget{width:min(620px,100%);display:flex;flex-direction:column;align-items:center;gap:var(--space-4)}:where(.vietmy-lesson-player) .speak-model{position:static;width:100%;height:auto;padding:14px;display:flex;align-items:center;justify-content:space-between;gap:14px}:where(.vietmy-lesson-player) .speak-model p{margin:4px 0 0}:where(.vietmy-lesson-player) .speak-model audio{max-width:100%}:where(.vietmy-lesson-player) .speak-mode,:where(.vietmy-lesson-player) .rhythm-tempo{font-weight:900}:where(.vietmy-lesson-player) .speak-no-model{color:var(--ink-faint);font-size:var(--step--1)}:where(.vietmy-lesson-player) .speak-record-button,:where(.vietmy-lesson-player) .rhythm-pad{min-width:180px;min-height:52px;border:2px solid var(--ink);border-radius:999px;background:var(--paper-2);box-shadow:0 4px 0 var(--line-2);cursor:pointer;font-weight:900}:where(.vietmy-lesson-player) .speak-record-button.is-recording{border-color:var(--berry-dark);background:var(--berry-light);box-shadow:0 4px 0 var(--berry-dark)}:where(.vietmy-lesson-player) .speak-record-dot{display:inline-block;width:11px;height:11px;margin-right:8px;border-radius:50%;background:var(--berry)}:where(.vietmy-lesson-player) .speak-controls{display:flex;flex-wrap:wrap;align-items:center;justify-content:center;gap:9px}:where(.vietmy-lesson-player) .speak-cancel-button,:where(.vietmy-lesson-player) .speak-retry-button{min-height:44px;padding:0 15px;border:1.5px solid var(--line-2);border-radius:999px;background:var(--paper-2);color:var(--ink-soft);cursor:pointer;font-weight:800}:where(.vietmy-lesson-player) .speak-retry-button{border-color:var(--sky-dark);background:var(--sky-light);color:var(--ink)}:where(.vietmy-lesson-player) .speak-record-button:disabled{cursor:wait;opacity:.64}:where(.vietmy-lesson-player) .speak-status.is-error{color:var(--berry-ink)}:where(.vietmy-lesson-player) .rhythm-heading{width:100%;display:flex;justify-content:space-between;gap:12px;color:var(--ink-faint)}:where(.vietmy-lesson-player) .rhythm-pattern{width:100%;margin:0;padding:0;display:flex;flex-wrap:wrap;justify-content:center;gap:7px;list-style:none}:where(.vietmy-lesson-player) .rhythm-cue{min-width:58px;padding:8px;display:grid;place-items:center;border:1.5px solid var(--line-2);border-radius:10px;background:var(--paper-2)}:where(.vietmy-lesson-player) .rhythm-cue.is-next{border-color:var(--sun-dark);background:var(--sun-light)}:where(.vietmy-lesson-player) .rhythm-cue span{font-family:JetBrains Mono,monospace}:where(.vietmy-lesson-player) .rhythm-pad{min-width:220px;min-height:100px;border-radius:18px;background:var(--sun);box-shadow:0 5px 0 var(--sun-dark)}:where(.vietmy-lesson-player) .rhythm-pad span,:where(.vietmy-lesson-player) .rhythm-pad small{display:block}:where(.vietmy-lesson-player) .rhythm-reset{min-height:44px;padding:0 16px;border:1.5px solid var(--line-2);border-radius:11px;background:var(--paper-2);cursor:pointer}:where(.vietmy-lesson-player) .rhythm-reset:disabled{opacity:.45}:where(.vietmy-lesson-player) .celebration-sheet{width:min(620px,100%);min-height:100%;padding:var(--space-5);display:flex;flex-direction:column;align-items:center;justify-content:center;gap:var(--space-3);text-align:center;animation:vietmy-player-celebrate-in .4s cubic-bezier(.2,.9,.25,1.15) both}:where(.vietmy-lesson-player) .celebration-sheet h2{margin:0;font-size:clamp(26px,4vw,38px);line-height:1.05}:where(.vietmy-lesson-player) .celebration-sheet>p:not(.eyebrow){margin:0;color:var(--ink-soft)}:where(.vietmy-lesson-player) .celebration-icon{font-size:var(--step-6);filter:drop-shadow(0 4px 0 rgba(42,38,32,.12))}:where(.vietmy-lesson-player) .goal-done{color:var(--grass-ink)!important;font-weight:800}:where(.vietmy-lesson-player) .next-milestone{width:min(440px,100%);margin:6px 0;padding:12px 16px;display:flex;flex-direction:column;gap:3px;border:1.5px solid var(--line-2);border-radius:14px;background:var(--paper-2);box-shadow:0 3px 0 var(--line-2)}:where(.vietmy-lesson-player) .next-milestone small{color:var(--sun-ink);font:500 var(--step--2) "JetBrains Mono";letter-spacing:.09em}:where(.vietmy-lesson-player) .next-milestone strong{font-size:var(--step-0)}:where(.vietmy-lesson-player) .next-milestone span{color:var(--ink-soft);font-size:var(--step--1)}:where(.vietmy-lesson-player) .recap-stats{width:min(440px,100%);margin:7px 0;display:grid;grid-template-columns:1fr 1fr;gap:8px}:where(.vietmy-lesson-player) .recap-stats div{padding:11px;display:flex;flex-direction:column;border:1.5px solid var(--grass-dark);border-radius:13px;background:var(--paper-2)}:where(.vietmy-lesson-player) .recap-stats strong{font:900 var(--step-3) "JetBrains Mono";color:var(--grass-ink)}:where(.vietmy-lesson-player) .recap-stats span{color:var(--ink-soft);font-size:var(--step--2)}:where(.vietmy-lesson-player) .brick-list{display:flex;flex-wrap:wrap;justify-content:center;gap:6px}:where(.vietmy-lesson-player) .brick-list span{padding:6px 10px;border:1px solid var(--grass-dark);border-radius:999px;background:var(--paper-2);color:var(--grass-ink);font-size:var(--step--2);font-weight:800}:where(.vietmy-lesson-player) .recap-actions{margin-top:7px;display:flex;gap:8px}:where(.vietmy-lesson-player) .recap-streak{margin:6px 0 0!important;color:var(--sun-ink)!important;font-weight:800}@keyframes vietmy-player-paper-in{0%{opacity:0;transform:translateY(12px) rotate(.3deg)}}@keyframes vietmy-player-card-in{0%{opacity:0;transform:translateY(16px)}}@keyframes vietmy-player-celebrate-in{0%{opacity:0;transform:translateY(12px) scale(.97)}}@keyframes vietmy-player-sync-pulse{50%{transform:scale(.7);opacity:.55}}:where(.vietmy-lesson-player) .scene-widget,:where(.vietmy-lesson-player) .explore-widget{width:100%;display:grid;gap:var(--space-3)}:where(.vietmy-lesson-player) .scene-stage{position:relative;overflow:hidden;border:2px solid var(--line-2);border-radius:14px;background:var(--paper-2);aspect-ratio:16 / 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