:root{
  color-scheme:light;
  --navy:#0a2d63;--navy-2:#123f7b;--blue:#0b63d8;--cyan:#09a9c8;--ink:#17243a;--muted:#627188;
  --line:#d5e0ec;--line-strong:#bdcede;--canvas:#f3f7fb;--paper:#fff;--soft-blue:#edf5ff;
  --soft-cyan:#edf9fa;--soft-amber:#fff9e8;--green:#157347;--red:#b42318;
  --shadow:0 12px 36px rgba(10,45,99,.09);--radius:18px;--max:1180px;
}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{min-width:320px;margin:0;color:var(--ink);background:var(--canvas);font-family:"Segoe UI Variable","Segoe UI",Roboto,Arial,sans-serif;line-height:1.55}button,input,select{font:inherit}button,a{touch-action:manipulation}button{cursor:pointer}button:disabled{cursor:not-allowed}.primary:disabled{border-color:#cddbe7;color:#53697d;background:#e7eef5;box-shadow:none}img{max-width:100%}.shell{width:min(var(--max),calc(100% - 32px));margin-inline:auto}.skip-link{position:fixed;left:12px;top:-80px;z-index:99;padding:10px 14px;border:2px solid var(--blue);border-radius:10px;color:var(--navy);background:#fff;font-weight:800}.skip-link:focus{top:12px}:focus-visible{outline:3px solid var(--blue);outline-offset:3px}

.topbar{position:sticky;top:0;z-index:40;border-top:3px solid var(--blue);border-bottom:1px solid var(--line);background:rgba(250,252,255,.97);backdrop-filter:blur(14px);box-shadow:0 4px 18px rgba(10,45,99,.05)}.topbar__inner{display:flex;align-items:center;gap:14px;min-height:68px}.brand{display:flex;align-items:center;flex:0 0 auto}.brand img{display:block;width:154px;height:auto}.header-rule{width:1px;height:24px;background:var(--line-strong)}.back,.header-context{color:var(--muted);font-size:.78rem;font-weight:700;text-decoration:none;white-space:nowrap}.back:hover{color:var(--blue)}.header-context b{margin-left:8px;color:var(--navy);text-transform:uppercase}.topbar__spacer{flex:1}.language{min-height:42px;max-width:220px;padding:0 34px 0 12px;border:1px solid var(--line);border-radius:11px;color:var(--ink);background:#fff}.primary,.secondary{min-height:44px;padding:0 17px;border:1px solid transparent;border-radius:11px;font-weight:800;white-space:nowrap}.primary{color:#fff;background:var(--navy);box-shadow:0 6px 16px rgba(10,45,99,.16)}.primary:hover{background:var(--navy-2)}.secondary{color:var(--navy);border-color:var(--line);background:#fff}.secondary:hover{border-color:#99b5cf;background:#f7fbff}

.hero{padding:30px 0 18px;border-bottom:1px solid #e1e9f2;background:linear-gradient(180deg,#f9fcff 0%,var(--canvas) 100%)}.eyebrow{margin:0 0 9px;color:#087f96;font-size:.72rem;font-weight:900;letter-spacing:.12em;text-transform:uppercase}.hero h1{margin:0;color:var(--navy);font-size:clamp(2rem,4.3vw,3.25rem);line-height:1.08;letter-spacing:-.035em}.hero h1 span{font-weight:650}.hero h1 span::before{content:"  /  ";color:#8ca4bb;font-weight:400}.hero__lead{margin:12px 0 0;color:var(--ink);font-size:.94rem}.hero__meta{display:flex;flex-wrap:wrap;gap:8px;margin-top:17px}.hero__meta>span{padding:7px 12px;border:1px solid var(--line);border-radius:999px;color:var(--muted);background:#fff;font-size:.78rem}.hero__meta strong{color:var(--navy)}.language-notice{display:flex;align-items:center;justify-content:space-between;gap:16px;margin-top:14px;padding:12px 15px;border:1px solid #ead7a4;border-radius:12px;color:#5b4717;background:var(--soft-amber);font-size:.76rem}.language-notice span{color:#7a6531}.legal-note{max-width:980px;margin:14px 0 0;color:#718097;font-size:.69rem}

.content{display:grid;grid-template-columns:minmax(0,1fr) 242px;gap:22px;align-items:start;padding:20px 0 64px}.workspace{display:grid;gap:18px;min-width:0}.video-card,.instructions,.part,.result,.vocabulary,.sidebar{border:1px solid var(--line);border-radius:var(--radius);background:var(--paper);box-shadow:var(--shadow)}.video-card{overflow:hidden}.mode-chooser{display:grid;grid-template-columns:minmax(180px,.7fr) minmax(390px,1.3fr);gap:18px;align-items:center;padding:15px 17px;border-bottom:1px solid var(--line)}.mode-chooser>div:first-child{display:grid;gap:2px}.mode-chooser>div:first-child strong{color:var(--navy);font-size:.88rem}.mode-chooser>div:first-child span{color:var(--muted);font-size:.68rem}.mode-choice-actions{display:grid;grid-template-columns:1fr 1fr;gap:9px}.mode-choice{display:grid;gap:2px;min-height:61px;padding:10px 12px;border:1px solid var(--line);border-radius:11px;color:var(--ink);background:#fff;text-align:left}.mode-choice:hover{border-color:#91afc9;background:#f8fbff}.mode-choice.is-active{border-color:#3686b5;background:#eef7fd;box-shadow:0 0 0 2px rgba(54,134,181,.12)}.mode-choice strong{color:var(--navy);font-size:.82rem}.mode-choice span{color:var(--muted);font-size:.63rem}.mode-choice:disabled{cursor:not-allowed;opacity:.62}
.exam-toolbar{display:grid;grid-template-columns:minmax(0,1fr) minmax(110px,145px) auto auto;gap:16px;align-items:center;padding:13px 17px;border-bottom:1px solid var(--line);background:#f8fbfe}.exam-status{display:grid;grid-template-columns:max-content minmax(0,1fr);gap:2px 9px;align-items:center;min-width:0}.exam-status strong{color:var(--navy);font-size:.86rem}.exam-status small{grid-column:1/-1;color:var(--muted);font-size:.65rem}.mode-badge{width:max-content;padding:3px 7px;border:1px solid #9fc0dc;border-radius:999px;color:#174b76;background:#eaf3fb;font-size:.57rem;font-weight:900;letter-spacing:.04em;text-transform:uppercase}.mode-badge.practice{border-color:#abd8cf;color:#0d7164;background:#e9f8f4}.volume,.time{display:grid;gap:3px;color:var(--muted);font-size:.57rem;font-weight:900;letter-spacing:.045em;text-transform:uppercase}.volume input{width:100%;accent-color:var(--blue)}.time{text-align:right}.time strong{color:var(--navy);font-size:1.5rem;font-variant-numeric:tabular-nums;letter-spacing:.02em}.video-wrap{position:relative;aspect-ratio:16/9;background:#e8f1f8}.video-wrap iframe{position:absolute;inset:0;width:100%;height:100%;border:0}.video-note{display:flex;justify-content:space-between;gap:14px;padding:10px 16px;color:var(--muted);font-size:.65rem}.video-note strong{color:#087f96;font-weight:800}.video-offline{position:absolute;inset:0;display:grid;grid-template-columns:minmax(220px,.88fr) minmax(0,1.12fr);align-items:center;overflow:hidden;color:var(--ink);background:linear-gradient(135deg,#eef8ff,#d9effc)}.video-offline>img{width:100%;height:100%;object-fit:cover}.video-offline>span{display:grid;gap:9px;padding:clamp(22px,4vw,48px)}.video-offline small{color:var(--blue);font-size:.65rem;font-weight:900;letter-spacing:.11em}.video-offline strong{max-width:500px;color:var(--navy);font-size:clamp(1.35rem,3vw,2.3rem);line-height:1.08}.video-offline b{max-width:510px;color:var(--muted);font-size:.72rem;font-weight:600}

.product-promo{display:flex;align-items:center;justify-content:space-between;gap:22px;padding:17px 19px;border:1px solid #cce2e7;border-radius:15px;background:linear-gradient(120deg,#eef8ff,#edf9f7)}.product-promo div{display:grid;gap:3px}.product-promo span{color:#087f96;font-size:.65rem;font-weight:900;letter-spacing:.1em;text-transform:uppercase}.product-promo h2{margin:0;color:var(--navy);font-size:1rem}.product-promo p{margin:0;color:var(--muted);font-size:.72rem}.product-promo a{flex:0 0 auto;color:var(--navy);font-size:.76rem;font-weight:850;text-decoration:none}.instructions{padding:20px 22px}.instructions h2,.result h2,.vocabulary h2{margin:0;color:var(--navy);font-size:1.35rem}.instructions ul{margin:10px 0 0;padding-left:21px;color:#495b70;font-size:.82rem}.instructions li+li{margin-top:4px}

.part{overflow:hidden;scroll-margin-top:86px}.part__head{display:flex;align-items:flex-start;justify-content:space-between;gap:18px;padding:18px 21px;color:#fff;background:linear-gradient(118deg,var(--navy),var(--navy-2))}.part__head .eyebrow{margin-bottom:4px;color:#76e4f2}.part__head h2{margin:0;color:#fff;font-size:1.35rem;line-height:1.25}.part__head small{display:none;margin-top:5px;color:#dbeaf7;font-size:.72rem}.submitted.show-local .part__head small{display:block}.part__head>span{flex:0 0 auto;padding-top:4px;color:#cbdcf0;font-size:.69rem;font-weight:800}.task{padding:18px 21px}.task+.task{border-top:1px solid #e7edf4}.task-instruction{margin:0 0 13px;color:#087f8f;font-family:Georgia,"Times New Roman",serif;font-size:.92rem;font-weight:700}.question-list{display:grid;gap:10px}.question{padding:14px 15px;border:1px solid #dce6ef;border-radius:12px;background:#fff;scroll-margin-top:88px}.question:focus-within{border-color:#79a9d1;box-shadow:0 0 0 3px #edf5fc}.question.is-correct{border-color:#a8ddcf;background:#f5fcfa}.question.is-wrong{border-color:#efc2c1;background:#fff8f8}.question__top{display:grid;grid-template-columns:32px minmax(0,1fr);gap:10px;align-items:start}.question__number{display:grid;width:32px;height:32px;place-items:center;border-radius:50%;color:var(--navy);background:#edf3f9;font-size:.78rem;font-weight:900}.question__text{margin:2px 0 0;color:var(--ink);font-family:Georgia,"Times New Roman",serif;font-size:.98rem;font-weight:650}.question__translation{display:none;margin:6px 0 0;padding-left:10px;border-left:3px solid #9bcbd2;color:var(--muted);font-size:.76rem}.submitted.show-local .question__translation{display:block}.question__limit{display:block;margin-top:5px;color:#74879b;font-size:.61rem;font-weight:800;text-transform:uppercase}.answer{margin:11px 0 0 42px}.answer input[type=text]{width:min(100%,480px);min-height:40px;padding:0 10px;border:0;border-bottom:2px solid #718396;border-radius:3px 3px 0 0;color:var(--ink);background:#fbfdff}.answer input[type=text]:focus{border-bottom-color:var(--blue);outline:none;box-shadow:0 3px 0 rgba(11,99,216,.12)}.answer input:disabled{cursor:not-allowed;opacity:.65}.options{display:grid;gap:6px}.option{display:flex;gap:9px;align-items:flex-start;padding:8px 10px;border:1px solid transparent;border-radius:9px;cursor:pointer}.option:hover{background:#f7fafc}.option:has(input:checked){border-color:#afcbe3;background:var(--soft-blue)}.option input{margin-top:4px;accent-color:var(--blue)}.option small{display:none;margin-top:3px;color:var(--muted)}.submitted.show-local .option small{display:block}.feedback{display:none;margin:12px 0 0 42px;padding:12px 13px;border:1px solid var(--line);border-radius:10px;color:var(--muted);background:#f7fafc;font-size:.74rem}.submitted .feedback{display:grid;gap:8px}.feedback__top{display:flex;align-items:center;gap:8px}.feedback__status{padding:3px 7px;border-radius:999px;color:var(--green);background:#e8f6ef;font-size:.63rem;font-weight:900;text-transform:uppercase}.is-wrong .feedback__status{color:var(--red);background:#fdeeed}.feedback__answers{display:grid;grid-template-columns:1fr 1fr;gap:8px}.feedback__answers span,.feedback__detail{padding:9px 10px;border-radius:8px;background:#fff}.feedback small{display:block;color:#78879a;font-size:.6rem;font-weight:800;text-transform:uppercase}.feedback strong{color:var(--navy)}

.actions{position:sticky;bottom:10px;z-index:20;display:flex;align-items:center;justify-content:space-between;gap:16px;padding:13px 15px;border:1px solid var(--line-strong);border-radius:14px;background:rgba(255,255,255,.97);backdrop-filter:blur(12px);box-shadow:0 12px 36px rgba(10,45,99,.16)}.actions p{margin:0;color:var(--muted);font-size:.68rem}.actions p strong{color:var(--navy);font-size:.83rem}.error{display:none;margin:0;padding:11px 13px;border:1px solid #efc3c5;border-radius:10px;color:var(--red);background:#fff3f3;font-size:.75rem}.error.is-visible{display:block}
.sidebar{position:sticky;top:90px;align-self:start;padding:16px}.sidebar__score{display:flex;align-items:baseline;justify-content:space-between;gap:8px}.sidebar__score strong{color:var(--navy);font-size:1.65rem;font-variant-numeric:tabular-nums}.sidebar__score span{color:var(--muted);font-size:.65rem}.progress{height:7px;margin-top:9px;overflow:hidden;border-radius:999px;background:#e8eef5}.progress i{display:block;width:0;height:100%;background:linear-gradient(90deg,var(--blue),var(--cyan));transition:width .2s ease}.sidebar__status{display:grid;grid-template-columns:1fr auto;gap:4px 8px;align-items:center;margin-top:15px;padding:10px;border:1px solid var(--line);border-radius:10px;background:#f8fbfe}.sidebar__status span{width:max-content;padding:3px 6px;border-radius:999px;color:#174b76;background:#eaf3fb;font-size:.54rem;font-weight:900;text-transform:uppercase}.sidebar__status strong{color:var(--navy);font-size:1rem;font-variant-numeric:tabular-nums}.sidebar__status small{grid-column:1/-1;color:var(--muted);font-size:.61rem}.part-nav{display:grid;grid-template-columns:1fr 1fr;gap:7px;margin-top:13px}.part-nav button{min-height:39px;border:1px solid var(--line);border-radius:9px;color:var(--navy);background:#fff;font-size:.68rem;font-weight:800}.part-nav button:hover,.part-nav button.is-active{border-color:#91b6d4;background:var(--soft-blue)}.question-jump{display:grid;grid-template-columns:repeat(5,1fr);gap:5px;margin-top:12px}.question-jump button{aspect-ratio:1;border:1px solid var(--line);border-radius:7px;color:var(--muted);background:#fff;font-size:.61rem;font-weight:800}.question-jump button.done{border-color:#9fd2c8;color:#0c6f62;background:#eaf8f4}.question-jump button.current{border-color:var(--blue);color:#fff;background:var(--blue)}.navigator-key{display:flex;flex-wrap:wrap;gap:8px;margin-top:11px;color:#7a889a;font-size:.56rem}.saved-note{margin:11px 0 0;color:var(--muted);font-size:.61rem}

.result,.vocabulary{display:none;padding:22px}.result.is-visible,.vocabulary.is-visible{display:block}.scoreboard{display:grid;grid-template-columns:1.2fr 1fr 1fr;gap:9px;margin-top:16px}.scoreboard div{padding:15px;border:1px solid #dce7f1;border-radius:12px;background:var(--soft-blue)}.scoreboard div:nth-child(2){background:var(--soft-cyan)}.scoreboard div:nth-child(3){background:var(--soft-amber)}.scoreboard strong{display:block;color:var(--blue);font-size:1.65rem}.scoreboard span{color:var(--muted);font-size:.66rem}.part-scores{display:grid;grid-template-columns:repeat(4,1fr);gap:8px;margin-top:9px}.part-scores div{padding:10px;border:1px solid var(--line);border-radius:10px;color:var(--muted);background:#fff;text-align:center;font-size:.65rem}.part-scores strong{display:block;color:var(--navy);font-size:1rem}.disclaimer{margin:13px 0 0;color:#7a899d;font-size:.65rem}.vocab-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:7px;margin-top:15px}.vocab-item{display:grid;grid-template-columns:minmax(0,.8fr) minmax(0,1.2fr);gap:8px;padding:10px;border:1px solid var(--line);border-radius:9px;background:#fff}.vocab-item strong{font-size:.75rem}.vocab-item strong small{color:#708197;font-weight:650}.vocab-item span{color:var(--muted);font-size:.71rem}.footer{padding:26px 0 42px;border-top:1px solid var(--line);color:var(--muted);background:#fff;font-size:.66rem}

.video-wrap.is-locked::after{content:"Playback locked in Exam Mode";position:absolute;right:12px;bottom:12px;z-index:2;padding:7px 10px;border:1px solid #b9d7e4;border-radius:9px;color:#07516a;background:rgba(239,250,255,.94);font-size:.62rem;font-weight:850;pointer-events:none}.video-wrap.is-locked iframe{pointer-events:none}

@media(max-width:940px){.header-context{display:none}.content{grid-template-columns:1fr}.sidebar{position:static;order:-1}.sidebar__status,.question-jump,.navigator-key,.saved-note{display:none}.part-nav{grid-template-columns:repeat(4,1fr)}.mode-chooser{grid-template-columns:1fr}}
@media(max-width:700px){.shell{width:min(100% - 20px,var(--max))}.topbar__inner{min-height:62px;gap:8px}.brand img{width:136px}.header-rule,.back,.header-auth{display:none}.language{max-width:145px;margin-left:auto}.hero{padding-top:24px}.hero h1{font-size:2rem}.hero h1 span{display:block;margin-top:3px}.hero h1 span::before{content:""}.hero__lead{font-size:.84rem}.language-notice{display:grid}.content{padding-top:12px}.mode-choice-actions{grid-template-columns:1fr}.exam-toolbar{grid-template-columns:1fr auto}.volume{display:none}.time{grid-column:2;grid-row:1;text-align:right}.exam-toolbar>.primary{grid-column:1/-1;width:100%}.video-note{display:grid}.product-promo{align-items:flex-start;flex-direction:column}.part__head{display:grid;padding:16px}.part__head>span{padding:0}.task{padding:15px}.answer,.feedback{margin-left:0}.feedback__answers{grid-template-columns:1fr}.actions{bottom:6px}.actions p span{display:none}.scoreboard{grid-template-columns:1fr 1fr}.scoreboard div:first-child{grid-column:1/-1}.part-scores{grid-template-columns:1fr 1fr}.vocab-grid{grid-template-columns:1fr}.video-offline{grid-template-columns:1fr}.video-offline>img{position:absolute;inset:0;opacity:.15}.video-offline>span{position:relative;padding:24px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}.progress i{transition:none}}


/* Post-test learning workspace */
.result-actions{display:flex;flex-wrap:wrap;gap:8px;margin-top:14px}.result-actions .secondary{min-height:39px;font-size:.69rem}.result-actions .secondary.is-active{border-color:#7db7d8;color:var(--blue);background:#eaf6ff}.attempt-history{display:grid;grid-template-columns:minmax(190px,.45fr) minmax(0,1.55fr);gap:18px;margin-top:16px;padding-top:15px;border-top:1px solid var(--line)}.attempt-history h3{margin:0;color:var(--navy);font-size:.83rem}.attempt-history>div>span{color:var(--muted);font-size:.61rem}.attempt-history>div:last-child{display:grid;gap:6px}.attempt-history>div:last-child>div{display:grid;grid-template-columns:34px 60px 1fr;gap:8px;align-items:center;padding:7px 9px;border:1px solid var(--line);border-radius:9px;background:#f9fcff}.attempt-history>div:last-child span{color:#087f96;font-size:.6rem;font-weight:900}.attempt-history>div:last-child strong{color:var(--navy);font-size:.74rem}.attempt-history>div:last-child small{color:var(--muted);font-size:.62rem}.attempt-history p{margin:0;color:var(--muted);font-size:.68rem}
.post-review{display:none;overflow:hidden;border:1px solid #c9dce9;border-radius:22px;background:linear-gradient(180deg,#fff 0%,#f6fbff 100%);box-shadow:0 18px 48px rgba(10,45,99,.1)}.post-review.is-visible{display:block}.post-review__head{display:grid;grid-template-columns:minmax(240px,.8fr) minmax(300px,1.2fr);gap:28px;align-items:end;padding:24px 26px 20px;border-bottom:1px solid var(--line);background:radial-gradient(circle at 92% 0,rgba(9,169,200,.12),transparent 34%),linear-gradient(135deg,#fff,#f2f8ff)}.post-review__head h2{margin:0;color:var(--navy);font-size:clamp(1.45rem,3vw,2rem);letter-spacing:-.025em}.post-review__head>p{margin:0;color:var(--muted);font-size:.78rem}.review-context{display:grid;grid-template-columns:minmax(360px,1fr) minmax(165px,.38fr) minmax(135px,.26fr);gap:14px;align-items:end;padding:18px 24px;background:#fbfdff}.review-context>label,.review-context>div{display:grid;gap:7px}.review-label{color:#61748b;font-size:.62rem;font-weight:900;letter-spacing:.08em;text-transform:uppercase}.review-context select{width:100%;min-height:44px;padding:0 34px 0 12px;border:1px solid var(--line-strong);border-radius:10px;color:var(--navy);background:#fff;font-weight:750}.review-part-buttons{display:grid;grid-template-columns:repeat(4,1fr);gap:7px}.review-part-buttons button{display:grid;gap:1px;min-height:44px;padding:6px 10px;border:1px solid var(--line);border-radius:10px;color:var(--navy);background:#fff;text-align:left}.review-part-buttons button:hover,.review-part-buttons button.is-active{border-color:#74afd4;background:#eaf6ff;box-shadow:inset 0 0 0 1px #b9dcf0}.review-part-buttons strong{font-size:.7rem}.review-part-buttons span{color:var(--muted);font-size:.56rem;font-variant-numeric:tabular-nums}.review-player{position:relative;aspect-ratio:16/9;margin:0 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24px;border:1px solid var(--line);border-radius:13px 13px 0 0;background:#fff}.review-tabs button{min-height:48px;padding:8px 10px;border:0;border-right:1px solid var(--line);color:#53677f;background:transparent;font-size:.7rem;font-weight:850}.review-tabs button:last-child{border-right:0}.review-tabs button:hover{background:#f4f9fd}.review-tabs button.is-active{color:var(--blue);background:#eaf5ff;box-shadow:inset 0 -3px 0 var(--cyan)}.review-panel{min-height:280px;margin:0 24px 18px;padding:20px;border:1px solid var(--line);border-top:0;border-radius:0 0 13px 13px;background:#fff}.review-source{margin:0;padding:0 24px 22px;color:#788a9d;font-size:.58rem}.answer-analysis>header{display:grid;grid-template-columns:auto 1fr;gap:12px;align-items:start}.answer-analysis>header>span{padding:5px 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