.l5-app{--l5-ink:#16354b;--l5-muted:#607588;--l5-accent:#087d78;--l5-border:#dce5ec;max-width:1440px;margin:0 auto;padding:32px 36px 64px;color:var(--l5-ink);font-size:16px;line-height:1.65}
.l5-app *{box-sizing:border-box}.l5-app [hidden]{display:none!important}.l5-app h1,.l5-app h2,.l5-app h3{font-family:inherit;color:var(--l5-ink);font-weight:700;line-height:1.3}.l5-app h1{font-size:38px;margin:14px 0}.l5-app h2{font-size:23px;margin:0 0 14px}.l5-app h3{font-size:25px;margin:12px 0 6px}.l5-app p{margin:0 0 16px}.l5-app a{color:var(--l5-accent)}.l5-app button,.l5-app select{font:inherit}.l5-app :focus-visible{outline:3px solid #1974c5;outline-offset:4px}.l5-app button:disabled{opacity:.5;cursor:default}.l5-breadcrumb{display:flex;flex-wrap:wrap;gap:8px 12px;font-size:14px;margin-bottom:8px}.l5-storage{font-size:13px;color:var(--l5-muted)}.l5-eyebrow{font-size:13px;font-weight:700;letter-spacing:.07em;color:var(--l5-accent)}
.l5-hero{display:flex;justify-content:space-between;align-items:center;gap:36px;background:#eaf5f2;border-radius:18px;padding:38px 42px;margin:28px 0}.l5-hero h1{font-size:46px}.l5-hero p{font-size:19px;margin:0;color:#466471}.l5-stats{display:flex;gap:28px;margin:0;text-align:center;flex-shrink:0}.l5-stats div{min-width:70px}.l5-stats dt{font-size:13px;font-weight:400;color:var(--l5-muted)}.l5-stats dd{font-size:35px;font-weight:700;margin:0}.l5-kind-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:22px}.l5-kind-card{display:block;position:relative;background:#fff;border:1px solid var(--l5-border);border-radius:14px;padding:30px 28px;text-decoration:none!important;transition:border-color .15s,box-shadow .15s}.l5-kind-card:hover,.l5-lesson-card:hover{border-color:var(--l5-accent);box-shadow:0 4px 16px #16354b0c}.l5-kind-number{float:right;font-size:28px;font-weight:700;color:#b5cdcc}.l5-kind-card h2{margin:16px 0 12px}.l5-kind-card p{max-width:85%;color:var(--l5-muted);min-height:52px}.l5-card-bottom{display:flex;justify-content:space-between;align-items:center;gap:16px;padding-top:18px;border-top:1px solid #edf0f3;font-size:14px}.l5-card-bottom span{color:var(--l5-muted)}.l5-how{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:24px;margin:36px 0}.l5-how p{font-size:14px;color:var(--l5-muted);margin-top:6px}.l5-heading{margin:32px 0 22px}.l5-heading p{color:var(--l5-muted);font-size:18px}.l5-tip{background:#eaf5f2;padding:16px 20px;border-radius:10px;font-size:15px;margin-bottom:24px}.l5-tip summary{cursor:pointer;font-weight:600}.l5-tip p{margin:12px 0 0}.l5-list-heading{display:flex;justify-content:space-between;align-items:center;margin:30px 0 16px;gap:16px}.l5-list-heading h2{margin:0}.l5-list-heading>span{color:var(--l5-muted);font-size:14px}.l5-lesson-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:18px}.l5-lesson-card{display:block;text-decoration:none!important;border:1px solid var(--l5-border);border-radius:12px;background:#fff;padding:24px}.l5-lesson-card p{color:var(--l5-muted);font-size:14px}.l5-lesson-progress{display:block;font-size:14px;font-weight:600;padding-top:14px;border-top:1px solid #edf0f3}
.l5-connection{font-size:14px;color:var(--l5-muted);margin-bottom:12px}.l5-question-bar{display:flex;justify-content:space-between;align-items:center;gap:16px;margin:20px 0 12px}.l5-question-bar>span{font-size:14px;color:var(--l5-muted)}.l5-question-nav{display:flex;gap:8px;flex-wrap:wrap;margin-bottom:22px}.l5-question-nav button{border:1px solid #c7d6df;border-radius:8px;background:#fff;min-width:42px;min-height:40px;color:var(--l5-ink);padding:5px 10px}.l5-question-nav button[aria-current=true]{outline:2px solid var(--l5-accent);outline-offset:2px}.l5-question-nav .is-correct{background:#e0f2ec;border-color:#158761}.l5-question-nav .is-wrong{background:#fff0e5;border-color:#cc753a}.l5-work-grid{display:grid;grid-template-columns:minmax(0,1.1fr) minmax(0,1fr);gap:24px;align-items:start}.l5-panel{padding:28px;border:1px solid var(--l5-border);border-radius:14px;background:#fff;min-width:0}.l5-panel h2{font-size:21px}.l5-player{background:#f3f7f9;padding:14px;border-radius:10px;margin:16px 0 20px}.l5-player audio{width:100%;display:block;min-width:0}.l5-audio-tools{display:flex;justify-content:space-between;align-items:center;gap:12px;flex-wrap:wrap;margin-top:12px;font-size:14px}.l5-audio-tools label{margin:0;font-weight:400}.l5-audio-tools select{border:1px solid #c9d9e1;border-radius:6px;padding:4px;background:white}.l5-link{background:none;border:0;color:var(--l5-accent);padding:4px 0;text-decoration:underline;cursor:pointer}.l5-image-link{display:block;margin:20px auto;text-align:center}.l5-image-link img{display:block;max-width:100%;max-height:460px;width:auto;height:auto;margin:auto}.l5-image-link>span{font-size:13px;display:block;margin-top:8px}.l5-jp{font-size:20px;line-height:1.9;white-space:pre-wrap;overflow-wrap:anywhere}.l5-app fieldset{border:0;padding:0;margin:0;min-width:0}.l5-app legend{font-size:15px;color:var(--l5-muted);border:0;margin:0 0 12px}.l5-choices{display:grid;gap:10px;margin-bottom:20px}.l5-choice{display:flex;align-items:center;gap:12px;border:1px solid #cfdae2;border-radius:8px;padding:14px 16px;cursor:pointer;font-weight:400;margin:0;min-width:0}.l5-choice:has(input:checked){border-color:var(--l5-accent);background:#eef8f5}.l5-choice input{margin:0;flex:0 0 auto;accent-color:var(--l5-accent);width:18px;height:18px}.l5-choice-text{font-size:19px;overflow-wrap:anywhere}.l5-choice.is-correct,.l5-choice.is-correct:has(input:checked){border:2px solid #218261;background:#eff9f3}.l5-choice.is-wrong,.l5-choice.is-wrong:has(input:checked){border-color:#bf6b3d;background:#fff5ef}.l5-choice-mark{font-size:13px;margin-left:auto;white-space:nowrap}.l5-button{display:inline-flex;align-items:center;justify-content:center;gap:8px;padding:10px 17px;min-height:44px;border:1px solid #c8d7e0;border-radius:8px;background:#fff;color:var(--l5-ink)!important;text-decoration:none!important;font-weight:600;font-size:15px;cursor:pointer}.l5-button:hover{background:#f1f7f8}.l5-primary{background:var(--l5-accent);border-color:var(--l5-accent);color:#fff!important}.l5-primary:hover{background:#086760}.l5-move{display:flex;justify-content:space-between;gap:12px;margin-top:24px;padding-top:20px;border-top:1px solid var(--l5-border)}.l5-review-panel>p{color:var(--l5-muted)}.l5-verdict{border-radius:8px;padding:14px 16px;font-weight:600;background:#e6f4ed;color:#1b6c4d}.l5-verdict.is-wrong{background:#fff1e6;color:#925026}.l5-translation-toggle{font-weight:400;font-size:14px;display:flex;align-items:center;gap:8px;margin:18px 0}.l5-translation-toggle input{accent-color:var(--l5-accent);margin:0}.l5-transcript article{border-top:1px solid #e6ebef;padding:14px 0}.l5-transcript article:last-child{padding-bottom:0}.l5-speaker{display:block;font-size:12px;font-weight:700;color:var(--l5-accent);margin-bottom:4px}.l5-transcript .l5-jp{font-size:19px;margin:0 0 6px}.l5-transcript .l5-vi{font-size:15px;line-height:1.7;color:var(--l5-muted);margin:0;white-space:pre-wrap}.l5-transcript.hide-translation .l5-vi{display:none}.l5-complete{background:#eaf5f2;border-radius:14px;padding:28px;margin-top:24px}.l5-actions{display:flex;flex-wrap:wrap;gap:12px}.l5-error{font-size:14px;color:#a1342a;margin-top:12px!important}.l5-notice{padding:16px;background:#fff1dc;border-radius:8px}
@media(min-width:1600px){.l5-app:has(.l5-work-grid){max-width:none;padding-left:4%;padding-right:4%}}
@media(max-width:1100px){.l5-hero{padding:30px;gap:20px}.l5-stats{gap:16px}.l5-hero h1{font-size:39px}.l5-lesson-grid{grid-template-columns:repeat(3,minmax(0,1fr))}.l5-panel{padding:22px}.l5-work-grid{gap:18px}}
@media(max-width:767px){.l5-app{padding:24px 16px 44px}.l5-app h1{font-size:29px}.l5-hero{display:block;padding:26px 22px;margin:22px 0}.l5-hero p{font-size:17px}.l5-stats{justify-content:space-around;margin-top:24px;padding-top:20px;border-top:1px solid #cedfdb}.l5-stats dd{font-size:28px}.l5-kind-grid,.l5-work-grid{grid-template-columns:minmax(0,1fr)}.l5-kind-card{padding:24px}.l5-kind-card p{max-width:none;min-height:0}.l5-kind-card h2{font-size:22px}.l5-lesson-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}.l5-lesson-card{padding:18px}.l5-how{grid-template-columns:1fr;gap:12px}.l5-how p{margin-bottom:8px}.l5-heading{margin-top:24px}.l5-panel{padding:20px 16px}.l5-question-bar{align-items:flex-start;flex-direction:column;gap:4px}.l5-list-heading{align-items:flex-start;flex-direction:column;gap:6px}.l5-work-grid{gap:16px}.l5-review-panel{scroll-margin-top:84px}.l5-move .l5-button{font-size:14px;padding:10px 12px}.l5-complete{padding:22px}.l5-transcript .l5-jp{font-size:18px}.l5-app .l5-choice-text{font-size:18px}}
#l5-review-next{margin-top:20px}

/* Original listening: first-play HD and answer explanations. */
.l5-hd-status{color:#557080;font-size:14px;margin:12px 0}
.l5-explanation{background:#f0f8f5;border-radius:12px;padding:18px!important;color:#173c4a}
.l5-explanation h3{font-size:18px;margin:0 0 10px}
.l5-explanation ol{padding-left:22px}
.l5-explanation li{margin:8px 0}
.l5-tip a{font-weight:600;text-decoration:underline}

/* ===== Shared N4 page design (2026-10-15): cream page, serif titles with the red bar, hero art, white cards, red accents. ===== */
.l5-app.l5-app{--d-red:#cd2f39;--d-brown:#6f4b31;--d-brown-2:#9a6243;--d-navy:#1f2552;--d-ink:#2b3446;--d-line:#ece3da;--d-peach:#fcf4eb;--d-peach-line:#f0d9bd;--d-shadow:0 1px 2px rgba(80,50,30,.04),0 6px 18px rgba(80,50,30,.05)}
.l5-app .l5-breadcrumb{align-items:center;gap:6px 9px;font-size:13px;color:var(--d-ink)}
.l5-app .l5-breadcrumb a{color:var(--d-ink)}
.l5-app .l5-hero{position:relative;display:block;min-height:240px;margin:8px 0 6px;padding:6px 0 22px;background:none;border:0;border-radius:0}
.l5-app .l5-hero>:not(.n4ui-hero-art),.l5-app .l5-heading>:not(.n4ui-hero-art){position:relative;z-index:1;max-width:58%}
.l5-app .l5-heading{position:relative;min-height:200px;margin:18px 0 16px}
.l5-app .l5-eyebrow{color:var(--d-brown-2)}
.l5-app .l5-hero h1,.l5-app .l5-heading h1{margin:8px 0 10px;padding:2px 0 2px 18px;border-left:7px solid var(--d-red);font:600 36px/1.25 "Noto Serif","Times New Roman",Georgia,serif;letter-spacing:0;color:#151515}
.l5-app .l5-heading h1{font-size:34px}
.l5-app .l5-hero p,.l5-app .l5-heading p{color:#5c6672;font-size:16px}
.l5-app .l5-stats{justify-content:flex-start;gap:10px 28px;margin:14px 0 0;text-align:left}
.l5-app .l5-stats div{display:flex;flex-direction:row-reverse;align-items:baseline;gap:6px;min-width:0}
.l5-app .l5-stats dd{font:600 24px/1.2 "Noto Serif","Times New Roman",serif;color:var(--d-brown)}
.l5-app .l5-tip{background:#fff;border:1px solid var(--d-line);border-left:4px solid var(--d-red);border-radius:10px}
.l5-app .l5-primary{background:#d04f4d;border-color:#c64543;color:#fff!important}
.l5-app .l5-primary:hover{background:#bb3f3d}
.l5-app .l5-hub-bar h2,.l5-app .l5-list-heading h2{display:flex;align-items:center;gap:10px;color:var(--d-navy)}
.l5-app .l5-hub-bar .n4ui-icon{width:24px;height:24px;color:var(--d-red)}
.l5-app .l5-kind-card,.l5-app .l5-lesson-card,.l5-app .l5-panel{border-color:var(--d-line);box-shadow:var(--d-shadow)}
.l5-app .l5-kind-card:hover,.l5-app .l5-lesson-card:hover{border-color:#e6b1ab}
.l5-app .l5-kind-card h2,.l5-app .l5-lesson-card h3{color:var(--d-navy)}
.l5-app .l5-kind-number{color:#e2b7ad}
@media(max-width:760px){
 .l5-app .l5-hero>:not(.n4ui-hero-art),.l5-app .l5-heading>:not(.n4ui-hero-art){max-width:none}
 .l5-app .l5-hero,.l5-app .l5-heading{min-height:0}
 .l5-app .l5-hero h1,.l5-app .l5-heading h1{padding-left:12px;border-left-width:5px;font-size:26px}
}
.l5-app .n4ui-hero-art{top:-14px;width:min(38%,430px)}
.l5-app .l5-tip,.l5-app .l5-account,.l5-app .l5-breadcrumb{position:relative;z-index:2}
.l5-app .l5-hero,.l5-app .l5-heading{min-height:250px}
@media(max-width:760px){.l5-app .l5-hero,.l5-app .l5-heading{min-height:0}}
/* ===== Options in the Minna «Kiểm tra» style (2026-10-15): round keys, 2x2 for four options, 1 column on phones. ===== */
.l5-app.l5-app{--q-ink:#1f2933;--q-muted:#5b6776;--q-line:#e1e7ef;--q-line-strong:#c9d4e0;--q-soft:#f5f8fb;--q-tint:#eef4fb;--q-accent:#16698f;--q-accent-soft:#e7f2f8;--q-glow:rgba(22,105,143,.16);--q-ok:#15803d;--q-ok-soft:#e8f6ed;--q-ng:#c62828;--q-ng-soft:#fdeeee;--q-shadow:0 1px 2px rgba(15,30,50,.05),0 4px 14px rgba(15,30,50,.05)}
@media(min-width:721px){.l5-app .l5-choices.is-grid{grid-template-columns:repeat(2,minmax(0,1fr))}}
.l5-app .l5-choice{position:relative;gap:10px;min-height:52px;padding:9px 14px;background:#fff;border:1.5px solid var(--q-line-strong);border-radius:12px}
.l5-app .l5-choice:hover{border-color:var(--q-accent);background:var(--q-tint)}
.l5-app .l5-choice input{position:absolute;width:1px;height:1px;opacity:0;pointer-events:none}
.l5-app .l5-choice:has(input:focus-visible){outline:3px solid var(--q-glow);outline-offset:2px}
.l5-app .l5-choice-key{display:grid;place-items:center;flex:0 0 26px;height:26px;border-radius:50%;background:var(--q-soft);color:var(--q-muted);font:800 13px/1 Arial,sans-serif}
.l5-app .l5-choice:has(input:checked){border-color:var(--q-accent);background:var(--q-accent-soft);box-shadow:0 0 0 2px var(--q-glow)}
.l5-app .l5-choice:has(input:checked) .l5-choice-key{background:var(--q-accent);color:#fff}
.l5-app .l5-choice.is-correct,.l5-app .l5-choice.is-correct:has(input:checked){border:1.5px solid var(--q-ok);background:var(--q-ok-soft);box-shadow:none}
.l5-app .l5-choice.is-correct .l5-choice-key,.l5-app .l5-choice.is-correct:has(input:checked) .l5-choice-key{background:var(--q-ok);color:#fff}
.l5-app .l5-choice.is-wrong,.l5-app .l5-choice.is-wrong:has(input:checked){border:1.5px solid var(--q-ng);background:var(--q-ng-soft);box-shadow:none}
.l5-app .l5-choice.is-wrong .l5-choice-key,.l5-app .l5-choice.is-wrong:has(input:checked) .l5-choice-key{background:var(--q-ng);color:#fff}

/* N5 hub progress, quiz strip and neighboring lessons. */
#main-container:has(#l5-app),body:has(#l5-app){background:#f9f5f2}
.l5-app.l5-app,.l5-app:has(.l5-work-grid){--l5-accent:#915d2a;--l5-ink:#1f2933;--l5-border:#ece3da;max-width:1240px;margin:auto;padding-left:20px;padding-right:20px}
.l5-app .l5-eyebrow{color:#b32b35}.l5-button:hover{background:#faf4ee}.l5-player{background:#faf6f1}.l5-app .l5-explanation,.l5-complete{background:#fcf4eb;color:#1f2933}.l5-choice-text{min-width:0;overflow-wrap:anywhere}
.l5-choices{grid-template-columns:minmax(0,1fr)}.l5-app .l5-jp{color:#1f2933;font-size:18px}
.l5-hub-bar{display:flex;justify-content:space-between;align-items:center;gap:16px;margin:0 0 20px}.l5-hub-bar h2{font-size:21px;margin-bottom:4px}.l5-hub-bar p{font-size:14px;color:var(--l5-muted);margin:0}.l5-kind-done{display:block;color:#915d2a!important}
.l5-quick-tools{position:sticky;top:64px;z-index:20;border:1px solid #ece3da;border-radius:12px;background:#fff;padding:12px;margin-bottom:20px}
.l5-progress-strip{display:flex;align-items:center;gap:10px;flex-wrap:wrap}.l5-progress-strip>span{font-size:13px}.l5-progress-strip progress{flex:1;min-width:60px;width:100px;accent-color:#be5042;height:7px}.l5-progress-strip .l5-button{font-size:13px;padding:8px 12px;min-height:40px}
.l5-question-bar>strong{border-radius:24px;padding:8px 14px;background:#f6eee4;color:#915d2a}.l5-lesson-card>strong{display:block;font-size:14px;margin-top:10px}
.l5-navigation{display:grid;grid-template-columns:minmax(0,1fr) auto minmax(0,1fr);gap:16px;margin-top:28px}.l5-navigation a{display:block;background:#fff;border:1px solid #ece3da;border-radius:12px;padding:18px;overflow-wrap:anywhere}.l5-navigation small,.l5-navigation [data-nav-lesson]{display:block;font-size:12px;color:#915d2a;margin:4px 0}
@media(max-width:720px){.l5-app .l5-choices.is-grid{grid-template-columns:minmax(0,1fr)}.l5-hub-bar{flex-direction:column;align-items:stretch}.l5-lesson-grid{grid-template-columns:minmax(0,1fr)}.l5-progress-strip{gap:6px}.l5-progress-strip>span:first-child{width:55%}.l5-progress-strip .l5-button{flex:1;padding:6px;font-size:12px}.l5-navigation{grid-template-columns:minmax(0,1fr);gap:10px}.l5-navigation>span:empty{display:none}}
.l5-app .l5-kind-done{display:inline;white-space:nowrap}