/* V2.5.23: khóa trang nền nhưng cho vùng bài tập cuộn độc lập trên desktop + mobile */
.exercise-studio-dialog{display:flex!important;flex-direction:column!important;overflow:hidden!important;overscroll-behavior:contain}
.exercise-studio-dialog>.modal-header{flex:0 0 auto}
.exercise-studio-dialog>.modal-body{flex:1 1 auto!important;min-height:0!important;max-height:none!important;overflow-y:auto!important;overflow-x:hidden!important;-webkit-overflow-scrolling:touch;touch-action:pan-y;overscroll-behavior-y:contain;scrollbar-gutter:stable}
.exercise-studio-dialog .exercise-studio-root{position:relative;min-height:100%;height:auto!important;overflow:visible!important;touch-action:pan-y}
@media(max-width:900px){
  #featureModal.open:has(.exercise-studio-dialog){align-items:stretch;overflow:hidden}
  .exercise-studio-dialog{height:100dvh!important;max-height:100dvh!important;margin:0!important;border-radius:0!important}
  .exercise-studio-dialog>.modal-body{height:0!important;min-height:0!important;padding-bottom:max(76px,env(safe-area-inset-bottom))!important}
}
@supports not selector(:has(*)){
  @media(max-width:900px){#featureModal.open{overflow:hidden}.exercise-studio-dialog>.modal-body{height:0!important}}
}

/* V2.5.23 — Exercise Studio */
.exercise-studio-dialog{width:min(1180px,calc(100vw - 28px));max-width:1180px;height:min(900px,calc(100dvh - 28px));max-height:calc(100dvh - 28px);margin:14px auto;border-radius:24px;overflow:hidden}.exercise-studio-dialog .modal-header{padding:14px 20px;border-bottom:1px solid #e7edf5;background:#fff}.exercise-studio-dialog .modal-body{padding:0;background:#f6f8fc;overflow:auto}.exercise-studio-root{min-height:640px;color:#21324a}.exercise-studio-root button,.exercise-studio-root textarea{font:inherit}.exs-dashboard,.exs-session,.exs-result{max-width:1100px;margin:0 auto;padding:22px}.exs-loading,.exs-empty{min-height:520px;display:grid;place-items:center;align-content:center;text-align:center;gap:8px;padding:30px}.exs-loading>span,.exs-empty>span{font-size:54px}.exs-loading strong,.exs-empty h3{font-size:22px;margin:0}.exs-loading small,.exs-empty p{color:#75859b;max-width:520px}.exs-primary,.exs-secondary,.exs-ghost{border:0;border-radius:12px;padding:12px 17px;font-weight:800;cursor:pointer;transition:.18s ease}.exs-primary{background:#1769e0;color:#fff;box-shadow:0 8px 20px rgba(23,105,224,.2)}.exs-primary:hover{transform:translateY(-1px);background:#125fcf}.exs-secondary{background:#eef4ff;color:#1b5fb9;border:1px solid #d3e3fb}.exs-secondary:hover{background:#e5efff}.exs-ghost{background:#fff;color:#60738b;border:1px solid #dce4ee}.exs-hero{display:grid;grid-template-columns:minmax(0,1.5fr) minmax(280px,.7fr);gap:18px;padding:28px;border-radius:22px;background:linear-gradient(135deg,#123e78,#1769e0 58%,#4ba0ff);color:#fff;box-shadow:0 18px 50px rgba(35,82,145,.18)}.exs-kicker{display:inline-flex;padding:6px 10px;border-radius:999px;background:rgba(255,255,255,.14);font-size:11px;font-weight:900;letter-spacing:.08em}.exs-hero h2{font-size:34px;line-height:1.15;margin:14px 0 10px;max-width:700px}.exs-hero p{margin:0;color:rgba(255,255,255,.82);font-size:15px;line-height:1.7;max-width:700px}.exs-hero-actions{display:flex;gap:10px;flex-wrap:wrap;margin-top:20px}.exs-hero .exs-primary{background:#fff;color:#145fbf;box-shadow:none}.exs-hero .exs-secondary{background:rgba(255,255,255,.12);border-color:rgba(255,255,255,.25);color:#fff}.exs-score-card{display:grid;place-items:center;align-content:center;gap:16px;border:1px solid rgba(255,255,255,.18);border-radius:18px;background:rgba(255,255,255,.1);backdrop-filter:blur(8px);padding:18px}.exs-score-ring,.exs-result-ring{--score:0;width:132px;aspect-ratio:1;border-radius:50%;display:grid;place-items:center;align-content:center;background:radial-gradient(circle at center,#184f92 0 57%,transparent 58%),conic-gradient(#8fd0ff calc(var(--score)*1%),rgba(255,255,255,.2) 0);box-shadow:inset 0 0 0 1px rgba(255,255,255,.12)}.exs-score-ring strong{font-size:28px}.exs-score-ring span{font-size:11px;color:rgba(255,255,255,.75)}.exs-score-meta{width:100%;display:grid;grid-template-columns:repeat(3,1fr);gap:8px}.exs-score-meta div{text-align:center;padding:8px 5px;border-radius:10px;background:rgba(255,255,255,.08)}.exs-score-meta strong,.exs-score-meta span{display:block}.exs-score-meta strong{font-size:17px}.exs-score-meta span{font-size:10px;color:rgba(255,255,255,.7);margin-top:2px}.exs-panel{margin-top:16px;padding:20px;border:1px solid #e0e7f0;border-radius:18px;background:#fff;box-shadow:0 8px 25px rgba(54,78,112,.05)}.exs-section-head{display:flex;justify-content:space-between;align-items:end;gap:16px;margin-bottom:15px}.exs-section-head>div>span{font-size:10px;font-weight:900;letter-spacing:.12em;color:#1769e0}.exs-section-head h3{font-size:21px;margin:3px 0 0}.exs-section-head>small{color:#7a899d}.exs-levels{display:grid;grid-template-columns:repeat(6,1fr);gap:9px}.exs-levels button{border:1px solid #dce4ef;border-radius:12px;background:#f9fbfd;padding:12px 8px;color:#40536b;cursor:pointer}.exs-levels button strong,.exs-levels button span{display:block}.exs-levels button strong{font-size:14px}.exs-levels button span{font-size:10px;color:#8896a8;margin-top:3px}.exs-levels button:hover{border-color:#98bdf3;background:#f3f8ff}.exs-levels button.active{border-color:#1769e0;background:#eaf3ff;color:#155db9;box-shadow:inset 0 0 0 1px #1769e0}.exs-levels button.active span{color:#4778b1}.exs-mode-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:10px}.exs-mode-card{display:grid;grid-template-columns:44px minmax(0,1fr);grid-template-rows:auto auto;gap:8px 9px;align-items:center;border:1px solid #dfe6ef;border-radius:15px;background:#fff;padding:14px;text-align:left;color:#273c56;cursor:pointer;min-height:132px;transition:.18s ease}.exs-mode-card:hover:not(:disabled){transform:translateY(-2px);border-color:#a7c8f6;box-shadow:0 10px 24px rgba(41,85,143,.08)}.exs-mode-card.active{border-color:#1769e0;background:#f3f8ff;box-shadow:inset 0 0 0 1px #1769e0}.exs-mode-card:disabled{opacity:.45;cursor:not-allowed}.exs-mode-icon{width:42px;height:42px;border-radius:12px;display:grid;place-items:center;background:#eef5ff;font-size:21px}.exs-mode-copy{min-width:0}.exs-mode-copy strong,.exs-mode-copy small{display:block}.exs-mode-copy strong{font-size:15px}.exs-mode-copy small{font-size:11px;line-height:1.45;color:#77889c;margin-top:4px}.exs-mode-side{grid-column:1/-1;display:flex;justify-content:space-between;align-items:center;padding-top:7px;border-top:1px solid #edf1f6}.exs-mode-side b{font-size:18px;color:#1769e0}.exs-mode-side small{font-size:10px;color:#8795a7}.exs-config-row{display:grid;grid-template-columns:auto minmax(0,1fr);gap:14px}.exs-count-picker{display:flex;gap:7px}.exs-count-picker button{min-width:76px;border:1px solid #dce4ef;border-radius:12px;background:#f9fbfd;padding:10px;color:#465a72;cursor:pointer}.exs-count-picker strong,.exs-count-picker span{display:block}.exs-count-picker strong{font-size:20px}.exs-count-picker span{font-size:10px;color:#8493a6}.exs-count-picker button.active{background:#eaf3ff;border-color:#1769e0;color:#155db9}.exs-start-summary{display:grid;grid-template-columns:42px minmax(0,1fr) auto;align-items:center;gap:12px;border-radius:14px;background:#f5f8fc;padding:11px 12px}.exs-start-summary>span{width:42px;height:42px;border-radius:12px;display:grid;place-items:center;background:#fff;font-size:20px}.exs-start-summary small,.exs-start-summary strong{display:block}.exs-start-summary small{font-size:10px;color:#8291a3}.exs-start-summary strong{font-size:14px;margin-top:2px}.exs-insights{display:grid;grid-template-columns:1.2fr .8fr;gap:16px;margin-top:16px}.exs-insight-card{border:1px solid #e0e7f0;border-radius:18px;background:#fff;padding:18px}.exs-insight-head{display:flex;justify-content:space-between;align-items:center;gap:10px}.exs-insight-head>div{display:flex;align-items:center;gap:8px}.exs-insight-head strong{font-size:15px}.exs-insight-head small{font-size:10px;color:#8795a7}.exs-mini-bars{height:120px;display:grid;grid-template-columns:repeat(7,1fr);align-items:end;gap:8px;margin-top:16px}.exs-mini-bars>div{height:100%;display:grid;grid-template-rows:1fr auto;align-items:end;gap:6px}.exs-mini-bars i{display:block;width:100%;min-height:7px;border-radius:7px 7px 3px 3px;background:linear-gradient(#4d9cff,#1769e0)}.exs-mini-bars span{text-align:center;font-size:9px;color:#8997a9}.exs-mini-bars p{grid-column:1/-1;align-self:center;text-align:center;color:#8a98aa}.exs-tip-card{background:linear-gradient(135deg,#fffaf0,#fff)}.exs-tip-card p{font-size:13px;line-height:1.7;color:#5d6d80}.exs-tip-card button{border:0;background:transparent;color:#1769e0;font-weight:800;padding:0;cursor:pointer}.exs-session{max-width:920px;padding-top:18px}.exs-session-top{display:grid;grid-template-columns:120px 1fr auto;align-items:center;gap:12px}.exs-back{justify-self:start;border:0;background:transparent;color:#60738a;font-weight:800;cursor:pointer;padding:8px}.exs-session-title{text-align:center}.exs-session-title small,.exs-session-title strong{display:block}.exs-session-title small{font-size:10px;color:#8391a3}.exs-session-title strong{font-size:15px;margin-top:2px}.exs-live-score{display:flex;align-items:center;gap:7px;font-size:11px}.exs-live-score span,.exs-live-score b,.exs-live-score em{padding:7px 9px;border-radius:9px;background:#fff;border:1px solid #e0e6ef;font-style:normal}.exs-live-score span{color:#168653}.exs-live-score b{color:#d87b0e}.exs-live-score em{color:#60738a}.exs-progress{height:7px;border-radius:999px;background:#e3e9f1;margin:14px 0 18px;overflow:hidden}.exs-progress i{display:block;height:100%;border-radius:inherit;background:linear-gradient(90deg,#1769e0,#58a8ff);transition:width .25s ease}.exs-question-card{border:1px solid #dfe6ef;border-radius:22px;background:#fff;padding:28px;box-shadow:0 16px 45px rgba(42,70,110,.08)}.exs-question-meta{display:flex;justify-content:space-between;align-items:center;gap:12px;color:#7d8b9d;font-size:11px}.exs-type-badge{display:inline-flex;padding:6px 9px;border-radius:999px;background:#edf5ff;color:#1769e0;font-weight:900}.exs-question-card h2{font-size:27px;line-height:1.45;margin:18px 0;color:#1f3148}.exs-listen-zone{display:grid;place-items:center;padding:14px 0 6px}.exs-audio-button{width:min(420px,100%);display:grid;place-items:center;gap:4px;border:1px solid #cfe0f6;border-radius:18px;background:linear-gradient(145deg,#edf6ff,#fff);padding:22px;color:#245c9f;cursor:pointer}.exs-audio-button>span{width:62px;height:62px;border-radius:50%;display:grid;place-items:center;background:#1769e0;color:#fff;font-size:27px;box-shadow:0 10px 25px rgba(23,105,224,.25)}.exs-audio-button strong{font-size:17px;margin-top:5px}.exs-audio-button small{font-size:10px;color:#778ba3}.exs-options{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin-top:20px}.exs-options button{display:grid;grid-template-columns:40px minmax(0,1fr);align-items:center;gap:11px;border:1px solid #dce4ee;border-radius:14px;background:#fff;padding:12px;text-align:left;color:#263a53;cursor:pointer;min-height:64px;transition:.15s ease}.exs-options button>span{width:36px;height:36px;border-radius:10px;display:grid;place-items:center;background:#f0f4f8;color:#687a90;font-weight:900}.exs-options button>strong{font-size:14px;line-height:1.45}.exs-options button:hover:not(:disabled){border-color:#8bb9f5;background:#f8fbff}.exs-options button.correct,.exs-options button.correct-answer{border-color:#64c79c;background:#edf9f4}.exs-options button.correct>span,.exs-options button.correct-answer>span{background:#d8f3e5;color:#137044}.exs-options button.wrong{border-color:#eda6b2;background:#fff2f4}.exs-options button.wrong>span{background:#ffe0e5;color:#a4364a}.exs-options button:disabled{cursor:default}.exs-answer-form{display:grid;gap:12px;margin-top:20px}.exs-answer-form label>span{display:block;font-size:11px;font-weight:800;color:#63758b;margin-bottom:7px}.exs-answer-form textarea{width:100%;resize:vertical;min-height:100px;border:1px solid #d8e1ec;border-radius:14px;padding:13px 14px;color:#26394f;background:#fbfcfe;outline:none}.exs-answer-form textarea:focus{border-color:#75aaf0;box-shadow:0 0 0 4px rgba(23,105,224,.08)}.exs-answer-form .exs-primary{justify-self:start}.exs-learning-hint{display:flex;gap:9px;align-items:flex-start;margin-top:18px;padding:11px 13px;border-radius:12px;background:#fff9e9;color:#725b26}.exs-learning-hint p{margin:0;font-size:12px;line-height:1.55}.exs-feedback{display:none;margin-top:18px}.exs-feedback.show{display:block;border-radius:16px;padding:16px}.exs-feedback.correct{background:#edf9f4;border:1px solid #b9e7d0}.exs-feedback.wrong{background:#fff5f6;border:1px solid #f1c8cf}.exs-feedback-head{display:flex;align-items:center;gap:11px}.exs-feedback-head>span{width:38px;height:38px;border-radius:50%;display:grid;place-items:center;background:#fff;font-size:19px;font-weight:900}.exs-feedback-head strong,.exs-feedback-head small{display:block}.exs-feedback-head strong{font-size:15px}.exs-feedback-head small{font-size:11px;margin-top:3px;color:#687a8e}.exs-correct-answer,.exs-explanation{margin-top:12px;padding:12px;border-radius:12px;background:rgba(255,255,255,.72)}.exs-correct-answer span,.exs-correct-answer strong{display:block}.exs-correct-answer span,.exs-explanation>span{font-size:10px;font-weight:900;color:#64768b}.exs-correct-answer strong{font-size:16px;margin-top:3px}.exs-explanation p{margin:6px 0 0;font-size:13px;line-height:1.65;color:#40546b}.exs-next{margin-top:14px}.exs-session-footer{display:flex;justify-content:space-between;align-items:center;gap:14px;padding:12px 6px;color:#8593a5;font-size:10px}.exs-skip{border:0;background:transparent;color:#67798e;font-weight:800;cursor:pointer;padding:8px}.exs-session-footer kbd{display:inline-grid;place-items:center;min-width:19px;height:19px;border:1px solid #d8e0e9;border-bottom-width:2px;border-radius:5px;background:#fff;color:#596d84}.exs-result{max-width:980px}.exs-result-hero{display:grid;grid-template-columns:160px 1fr;gap:24px;align-items:center;padding:24px;border-radius:22px;background:linear-gradient(135deg,#153d72,#1769e0);color:#fff}.exs-result-ring{width:145px;background:radial-gradient(circle at center,#174b89 0 57%,transparent 58%),conic-gradient(#8fd0ff calc(var(--score)*1%),rgba(255,255,255,.18) 0)}.exs-result-ring strong{font-size:31px}.exs-result-ring span{font-size:10px;color:rgba(255,255,255,.75)}.exs-result-copy>span{font-size:10px;font-weight:900;letter-spacing:.11em;color:#acd5ff}.exs-result-copy h2{font-size:27px;line-height:1.25;margin:8px 0}.exs-result-copy p{margin:0;color:rgba(255,255,255,.75)}.exs-result-stats{display:grid;grid-template-columns:repeat(5,1fr);gap:10px;margin:14px 0}.exs-result-stats article{display:grid;place-items:center;text-align:center;gap:3px;border:1px solid #e0e7f0;border-radius:14px;background:#fff;padding:13px}.exs-result-stats article>span{font-size:18px}.exs-result-stats strong{font-size:21px}.exs-result-stats small{font-size:10px;color:#7c8ca0}.exs-review-panel{border:1px solid #e0e7f0;border-radius:18px;background:#fff;padding:18px}.exs-review-list{display:grid;gap:8px}.exs-review-list details{border:1px solid #e1e7ef;border-radius:12px;overflow:hidden}.exs-review-list summary{display:grid;grid-template-columns:34px minmax(0,1fr) auto;align-items:center;gap:10px;padding:12px;cursor:pointer;list-style:none}.exs-review-list summary::-webkit-details-marker{display:none}.exs-review-list summary>span{width:30px;height:30px;border-radius:9px;display:grid;place-items:center;background:#eef3f8;font-weight:900}.exs-review-list details.correct summary>span{background:#def4e8;color:#137044}.exs-review-list details.wrong summary>span{background:#ffe4e8;color:#a43d50}.exs-review-list summary strong,.exs-review-list summary small{display:block}.exs-review-list summary strong{font-size:13px;line-height:1.45}.exs-review-list summary small{font-size:10px;color:#8391a3;margin-top:2px}.exs-review-list summary>b{font-size:10px;color:#65768a}.exs-review-body{padding:0 12px 13px 56px;border-top:1px solid #edf1f5}.exs-review-body>p{display:grid;grid-template-columns:120px 1fr;gap:8px;margin:10px 0}.exs-review-body>p span{font-size:10px;color:#7e8d9f}.exs-review-body>p strong{font-size:12px}.exs-review-body>div{padding:11px;border-radius:10px;background:#f6f8fb}.exs-review-body>div>span{font-size:10px;font-weight:900;color:#63758b}.exs-review-body>div p{margin:5px 0 0;font-size:12px;line-height:1.6;color:#465a70}.exs-result-actions{display:flex;justify-content:center;gap:9px;flex-wrap:wrap;margin-top:16px}
@media(max-width:900px){.exercise-studio-dialog{width:100vw;max-width:none;height:100dvh;max-height:100dvh;margin:0;border-radius:0}.exercise-studio-dialog .modal-body{padding-bottom:76px}.exs-dashboard,.exs-session,.exs-result{padding:14px}.exs-hero{grid-template-columns:1fr}.exs-score-card{grid-template-columns:130px 1fr;justify-items:stretch}.exs-score-meta{height:100%;align-content:center}.exs-mode-grid{grid-template-columns:1fr 1fr}.exs-mode-card{min-height:118px}.exs-levels{grid-template-columns:repeat(3,1fr)}.exs-config-row{grid-template-columns:1fr}.exs-insights{grid-template-columns:1fr}.exs-session-top{grid-template-columns:70px 1fr}.exs-live-score{grid-column:1/-1;justify-content:center}.exs-question-card{padding:20px}.exs-result-stats{grid-template-columns:repeat(3,1fr)}}
@media(max-width:600px){.exs-dashboard,.exs-session,.exs-result{padding:10px}.exs-hero{padding:19px;border-radius:17px}.exs-hero h2{font-size:27px}.exs-hero-actions{display:grid}.exs-hero-actions button{width:100%}.exs-score-card{grid-template-columns:1fr}.exs-score-ring{width:116px}.exs-panel{padding:15px;border-radius:15px}.exs-section-head{align-items:flex-start}.exs-section-head>small{display:none}.exs-levels{display:flex;overflow-x:auto;padding-bottom:3px;scrollbar-width:none}.exs-levels button{min-width:88px}.exs-mode-grid{grid-template-columns:1fr}.exs-mode-card{min-height:auto;grid-template-columns:44px minmax(0,1fr) 48px;grid-template-rows:auto}.exs-mode-side{grid-column:auto;border:0;padding:0;display:grid;text-align:right}.exs-count-picker{display:grid;grid-template-columns:repeat(3,1fr)}.exs-count-picker button{min-width:0}.exs-start-summary{grid-template-columns:40px 1fr}.exs-start-summary .exs-primary{grid-column:1/-1;width:100%}.exs-session-top{grid-template-columns:54px 1fr}.exs-session-title{text-align:right}.exs-live-score{gap:5px}.exs-live-score span,.exs-live-score b,.exs-live-score em{padding:6px 7px}.exs-question-card{padding:16px;border-radius:17px}.exs-question-meta{align-items:flex-start}.exs-question-card h2{font-size:21px;margin:15px 0}.exs-options{grid-template-columns:1fr}.exs-session-footer{display:grid;justify-items:center}.exs-session-footer>span{display:none}.exs-result-hero{grid-template-columns:1fr;text-align:center;justify-items:center;padding:19px}.exs-result-ring{width:126px}.exs-result-copy h2{font-size:23px}.exs-result-stats{grid-template-columns:repeat(2,1fr)}.exs-review-list summary{grid-template-columns:30px 1fr}.exs-review-list summary>b{display:none}.exs-review-body{padding-left:12px}.exs-review-body>p{grid-template-columns:1fr}.exs-result-actions{display:grid}.exs-result-actions button{width:100%}}