:root{color-scheme:light;--paper:#f6f3eb;--sheet:#fffdf8;--ink:#1b2d42;--muted:#66717d;--line:#d9d8d0;--orange:#d78426;--orange-soft:#faedda;--blue-soft:#e8eef1;--green:#386d5b;--red:#9d4d42;--shadow:0 8px 24px rgba(23,39,55,.06);font-family:"Aptos","Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;font-size:16px;line-height:1.58;color:var(--ink);background:var(--paper)}
*{box-sizing:border-box}body{margin:0;min-width:320px;background:var(--paper)}button,input,select,textarea{font:inherit;color:inherit}button,a,select,input,textarea{-webkit-tap-highlight-color:transparent}button{cursor:pointer}a{color:inherit}:focus-visible{outline:3px solid #d78426;outline-offset:3px}
.topbar{min-height:68px;padding:9px 24px;display:flex;align-items:center;justify-content:space-between;gap:22px;border-bottom:1px solid var(--line);background:rgba(255,253,248,.94);position:sticky;top:0;z-index:5}.wordmark{display:flex;align-items:center;gap:10px;text-decoration:none;min-width:205px}.wordmark-mark{width:37px;height:37px;border:1px solid var(--ink);border-radius:50%;display:grid;place-items:center;font-family:Georgia,serif;font-size:21px}.wordmark strong{display:block;font-size:15px;letter-spacing:.05em}.wordmark small{display:block;color:var(--muted);font-size:12px;margin-top:-2px}.countdown{display:flex;align-items:center;gap:10px;border-left:1px solid var(--line);padding-left:18px;margin-right:auto;white-space:nowrap}.countdown span{color:var(--muted);font-size:13px}.countdown strong{font-size:15px;font-variant-numeric:tabular-nums}.text-button{border:0;background:transparent;color:var(--green);padding:3px 5px;font-size:13px;text-decoration:underline;text-underline-offset:3px}.top-actions{display:flex;align-items:center;gap:14px}.search-box{width:min(28vw,320px);display:flex;gap:7px;align-items:center;padding:5px 10px;border:1px solid var(--line);border-radius:5px;background:#fff}.search-box span{font-size:20px;color:var(--muted)}.search-box input{border:0;outline:none;width:100%;min-width:0;font-size:14px}.search-box input:focus-visible{outline:0}.old-version-link{color:var(--muted);font-size:13px;text-decoration:none;border-bottom:1px solid #a9b0b4;padding:4px 0;white-space:nowrap}.old-version-link:hover{color:var(--ink);border-color:var(--orange)}.mobile-subject-trigger{display:none}
.layout{min-height:calc(100vh - 110px);display:grid;grid-template-columns:208px minmax(0,1fr)}.sidebar{padding:24px 13px 26px 23px;border-right:1px solid var(--line);background:#f1eee6;display:flex;flex-direction:column}.side-label{color:var(--muted);font-size:11px;font-weight:700;letter-spacing:.12em;text-transform:uppercase;padding:0 9px 8px}.subject-nav,.mode-nav{display:grid;gap:3px}.subject-nav button,.mode-nav button{width:100%;display:flex;align-items:center;gap:9px;text-align:left;background:transparent;border:0;padding:8px 9px;border-radius:4px;font-size:14px;min-height:39px}.subject-nav button:hover,.mode-nav button:hover{background:#e8e4d9}.subject-nav button[aria-current=page],.mode-nav button[aria-current=page]{background:var(--sheet);color:var(--ink);box-shadow:inset 3px 0 var(--orange);font-weight:700}.subject-nav .subject-icon{width:21px;color:var(--green);text-align:center}.subject-nav .subject-meta{margin-left:auto;color:var(--muted);font-size:11px}.subject-nav .pilot-mark{color:var(--orange);font-size:10px}.side-divider{border-top:1px solid var(--line);margin:18px 7px}.mode-nav button{color:#425266}.mode-nav button>:first-child{color:#889096;font-size:11px;font-variant-numeric:tabular-nums}.mode-nav button span{font-size:14px;color:var(--ink)}.mode-nav i{margin-left:auto;font-size:11px;font-style:normal;background:var(--orange-soft);border-radius:12px;padding:0 6px}.sidebar-note{margin-top:auto;padding:18px 9px 0;color:var(--muted);font-family:Georgia,serif;font-size:13px}.workspace{width:min(100%,1280px);padding:34px clamp(20px,4vw,58px) 64px;margin:0 auto;min-width:0}.page-footer{color:var(--muted);font-size:12px;text-align:center;border-top:1px solid var(--line);padding:13px 16px 22px}.mobile-mode-nav{display:none}.loading-note{padding:48px 12px;color:var(--muted)}
.eyebrow{font-size:12px;letter-spacing:.1em;color:var(--green);font-weight:700}h1,h2,h3,h4,p{margin-top:0}h1{font-family:Georgia,"Songti SC",serif;font-weight:500;font-size:clamp(28px,3vw,40px);line-height:1.2;margin:8px 0 14px;letter-spacing:-.02em}h2{font-size:22px;font-weight:600;line-height:1.35}h3{font-size:17px;font-weight:650;line-height:1.4}p{margin-bottom:13px}.muted{color:var(--muted)}.small{font-size:13px}.rule{border:0;border-top:1px solid var(--line);margin:24px 0}.page-heading{display:flex;justify-content:space-between;align-items:flex-end;gap:18px;margin-bottom:24px}.page-heading p{margin-bottom:0;color:var(--muted);max-width:690px}.kicker{color:var(--muted);font-size:13px}.button{border:1px solid var(--line);background:var(--sheet);border-radius:4px;padding:9px 15px;min-height:42px;font-weight:600;text-decoration:none;display:inline-flex;justify-content:center;align-items:center;gap:7px}.button:hover{border-color:#a5a59e}.button.primary{background:var(--ink);border-color:var(--ink);color:#fffdf8}.button.primary:hover{background:#294764}.button.accent{background:var(--orange-soft);border-color:#e4bc83;color:#1b2d42}.button.secondary{background:transparent}.button.small-button{min-height:34px;padding:5px 10px;font-size:13px}
.home-grid{display:grid;grid-template-columns:minmax(0,1.1fr) minmax(280px,.9fr);gap:22px}.home-lead{background:var(--ink);color:#fffdf8;padding:clamp(22px,4vw,42px);border-radius:3px;position:relative;overflow:hidden}.home-lead:after{content:"";position:absolute;width:210px;height:210px;right:-95px;bottom:-126px;border:1px solid rgba(255,255,255,.22);border-radius:50%;box-shadow:0 0 0 24px rgba(255,255,255,.03),0 0 0 48px rgba(255,255,255,.025)}.home-lead .eyebrow{color:#f1bd74}.home-lead h1{max-width:620px}.home-lead p{color:#dbe2e4;max-width:620px}.home-lead .button{position:relative;z-index:1;margin-top:8px}.continue-card{border:1px solid var(--line);background:var(--sheet);padding:22px;display:flex;flex-direction:column;justify-content:space-between}.continue-card h2{font-family:Georgia,"Songti SC",serif;font-weight:500;margin:6px 0 8px}.subject-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px;margin-top:15px}.subject-card{display:block;background:var(--sheet);border:1px solid var(--line);min-height:112px;padding:16px 17px;text-decoration:none;transition:border-color .15s,transform .15s}.subject-card:hover{border-color:#b88341;transform:translateY(-2px)}.subject-card-head{display:flex;align-items:center;gap:10px}.subject-card .subject-icon{font-size:19px;color:var(--green)}.subject-card strong{font-size:16px}.subject-card small{display:block;margin:7px 0 0 30px;color:var(--muted)}.pilot-card{background:#f3f0e9}.inline-note{border-left:3px solid var(--orange);background:#fbf3e6;padding:11px 14px;font-size:14px;color:#48515a}.section-heading{display:flex;justify-content:space-between;align-items:baseline;gap:12px;margin:30px 0 10px}.section-heading h2{margin:0;font-size:19px}
.breadcrumb{color:var(--muted);font-size:13px;margin-bottom:13px}.breadcrumb button{border:0;background:none;color:var(--green);padding:0;text-decoration:underline;text-underline-offset:3px}.mode-tabs{display:flex;flex-wrap:wrap;gap:0;border-bottom:1px solid var(--line);margin:17px 0 23px}.mode-tabs button{background:none;border:0;border-bottom:3px solid transparent;padding:10px 17px;color:var(--muted);min-height:46px}.mode-tabs button[aria-current=page]{color:var(--ink);border-color:var(--orange);font-weight:700}.filter-row{display:flex;align-items:center;flex-wrap:wrap;gap:10px;margin:17px 0}.filter-row label{color:var(--muted);font-size:13px}.filter-row select,.field{min-height:40px;border:1px solid var(--line);border-radius:3px;padding:6px 10px;background:#fffdf8}.topic-list{display:grid;border-top:1px solid var(--line)}.topic-row{display:grid;grid-template-columns:minmax(150px,.7fr) minmax(180px,1.3fr) auto;gap:15px;align-items:center;padding:13px 8px;border-bottom:1px solid var(--line)}.topic-row h3{font-size:15px;margin:0}.topic-row p{font-size:13px;color:var(--muted);margin:0}.topic-row button{white-space:nowrap}.topic-detail{max-width:940px}.detail-back{margin-bottom:17px}.detail-title{margin-bottom:6px}.detail-module{color:var(--muted);font-size:13px}.concept-section{padding:20px 0;border-top:1px solid var(--line)}.concept-section h2{font-size:17px;margin-bottom:12px}.concept-list{padding-left:23px;margin:0}.concept-list li{padding:4px 0}.formula-list{display:flex;flex-wrap:wrap;gap:10px}.formula{border:1px solid var(--line);padding:12px 14px;background:rgba(255,253,248,.75);min-width:180px}.formula strong{display:block;font-family:Georgia,"Cambria Math",serif;font-size:18px}.formula small{color:var(--muted)}.misconception{display:grid;grid-template-columns:minmax(140px,.7fr) minmax(220px,1.3fr);gap:15px;padding:12px 0;border-bottom:1px solid var(--line)}.misconception strong{color:#8a4b39}.practice-route{display:grid;grid-template-columns:repeat(3,1fr);gap:9px}.route-step{border:1px solid var(--line);background:var(--sheet);padding:13px;min-height:95px}.route-step b{display:block;color:var(--orange);font-size:12px;margin-bottom:5px}.route-step p{margin:0;font-size:14px}.example-list{display:grid;gap:14px}.example-card,.panel{background:var(--sheet);border:1px solid var(--line);padding:17px 19px}.example-card h3{margin-bottom:9px}.step-list{padding-left:22px;margin:9px 0 0}.step-list li{padding:5px 0 5px 4px}.step-list strong{color:var(--green)}
.question-card{border:1px solid var(--line);background:var(--sheet);padding:clamp(16px,3vw,25px);max-width:900px}.question-meta{display:flex;flex-wrap:wrap;gap:8px;color:var(--muted);font-size:12px;margin-bottom:10px}.pill{border:1px solid var(--line);padding:2px 8px;border-radius:20px}.question-stem{white-space:pre-wrap;font-size:17px;line-height:1.8;margin:14px 0}.question-part{border-top:1px dashed var(--line);padding:14px 0 4px}.question-part:first-of-type{border-top:0}.option-list{display:grid;gap:8px;margin:12px 0}.option-button{background:#fff;border:1px solid var(--line);text-align:left;padding:10px 12px;border-radius:3px}.option-button[aria-pressed=true]{border-color:var(--ink);box-shadow:inset 3px 0 var(--orange);background:#fffaf1}.answer-input,.answer-area{width:100%;max-width:620px;border:1px solid #abb1b2;background:#fff;border-radius:3px;padding:10px 12px;min-height:44px}.answer-area{min-height:120px}.unit-result{margin-top:9px;font-size:14px}.good{color:var(--green);font-weight:650}.bad{color:var(--red);font-weight:650}.explanation{margin-top:18px;padding-top:14px;border-top:1px solid var(--line)}.explanation h3{margin-bottom:8px}.step-reason{border-left:2px solid var(--orange);padding:7px 12px;margin:8px 0;background:#fbf7ee}
.game-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}.game-card{border:1px solid var(--line);background:var(--sheet);padding:17px}.game-card h3{margin:0 0 6px}.game-card p{color:var(--muted);font-size:14px;margin-bottom:10px}.game-card footer{display:flex;justify-content:space-between;align-items:center;gap:10px;border-top:1px solid var(--line);padding-top:10px;color:var(--muted);font-size:12px}.memory-board{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:9px;max-width:720px;margin:16px 0}.memory-tile{min-height:93px;background:var(--sheet);border:1px solid #bfc2be;padding:10px;text-align:left;font-size:14px;overflow-wrap:anywhere}.memory-tile[aria-pressed=true]{background:var(--orange-soft);border-color:#b9823e}.memory-tile.matched{background:#e7efe9;border-color:#8fb0a0;color:#315b4d}.bank-game{border:1px solid var(--line);max-width:800px;padding:clamp(18px,3vw,30px);background:var(--sheet)}.game-question{font-size:20px;line-height:1.7;font-family:Georgia,"Songti SC",serif}.scoreline{display:flex;gap:15px;flex-wrap:wrap;color:var(--muted);font-size:13px;margin-bottom:12px}.game-feedback{padding:10px 13px;background:var(--blue-soft);margin:12px 0;border-left:3px solid var(--green)}.exam-row{display:grid;grid-template-columns:minmax(130px,.6fr) minmax(160px,1fr) auto;align-items:center;gap:14px;padding:14px 0;border-bottom:1px solid var(--line)}.exam-row strong{display:block}.exam-row small{color:var(--muted)}.exam-status{color:#8a4b39;font-size:13px}.matrix{width:100%;border-collapse:collapse;margin-top:12px;font-size:14px}.matrix th,.matrix td{border-bottom:1px solid var(--line);text-align:left;padding:10px 8px;vertical-align:top}.matrix th{font-size:12px;color:var(--muted);font-weight:650}.matrix td:last-child{white-space:nowrap}.empty-state{padding:23px 0;color:var(--muted)}.warning-panel{background:#f6ecdd;border:1px solid #e5cda7;padding:16px 18px;margin:14px 0}.warning-panel strong{display:block;margin-bottom:5px;color:#794d24}.wrong-row{padding:13px 0;border-bottom:1px solid var(--line);display:flex;justify-content:space-between;gap:12px;align-items:center}
.sheet-heading{display:flex;justify-content:space-between;align-items:flex-start;gap:15px}.sheet-heading h2{margin:2px 0 0;font-family:Georgia,"Songti SC",serif;font-weight:500}.sheet-heading small{color:var(--muted)}.sheet-heading button{background:transparent;border:0;font-size:25px;line-height:1}.subject-sheet,.countdown-sheet{border:1px solid var(--line);background:var(--sheet);color:var(--ink);border-radius:5px;width:min(92vw,480px);padding:20px;box-shadow:var(--shadow)}.subject-sheet::backdrop,.countdown-sheet::backdrop{background:rgba(15,29,43,.42)}.subject-sheet-list{display:grid;grid-template-columns:1fr 1fr;gap:7px;margin-top:16px}.subject-sheet-list button{min-height:48px;border:1px solid var(--line);background:var(--sheet);text-align:left;padding:9px 12px}.countdown-sheet form{display:grid;gap:12px}.countdown-sheet p{color:var(--muted);font-size:14px;margin:3px 0}.countdown-sheet label{display:grid;gap:5px;color:var(--muted);font-size:13px}.countdown-sheet input{padding:9px;border:1px solid var(--line);background:#fff;min-height:42px}.sheet-actions{display:flex;justify-content:flex-end;gap:9px;margin-top:6px}.save-status{font-size:12px;color:var(--muted)}.sr-only{position:absolute!important;clip:rect(0,0,0,0)!important;width:1px;height:1px;overflow:hidden!important}
@media(max-width:980px){.topbar{padding:8px 14px;gap:13px}.search-box{width:220px}.layout{grid-template-columns:184px minmax(0,1fr)}.sidebar{padding-left:12px}.subject-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.topic-row{grid-template-columns:minmax(140px,.8fr) minmax(160px,1.2fr) auto}}
@media(max-width:700px){body{padding-bottom:65px}.topbar{display:grid;grid-template-columns:minmax(0,1fr) auto;grid-template-rows:auto auto;min-height:62px;padding:6px 12px;gap:8px}.wordmark{grid-column:1;grid-row:1;min-width:0;flex:1;gap:7px}.wordmark-mark{width:32px;height:32px;font-size:18px}.wordmark strong{font-size:13px}.wordmark small{font-size:11px}.countdown{grid-column:2;grid-row:1;padding-left:10px;gap:6px;margin:0;border:0;order:0;flex:0 0 auto;justify-content:flex-end}.countdown span{display:none}.countdown strong{font-size:12px}.countdown .text-button{font-size:12px}.top-actions{grid-column:1/-1;grid-row:2;order:0;display:flex;flex-wrap:wrap;gap:7px;align-items:center}.search-box{display:flex;order:0;flex:1 0 100%;width:100%;max-width:none;padding:3px 8px}.search-box input{min-height:29px}.save-status{display:block;order:4;font-size:10px;white-space:normal}.old-version-link{order:3;margin-left:auto;font-size:12px}.export-progress{order:2;font-size:12px}.mobile-subject-trigger{display:inline-flex;order:1;align-items:center;justify-content:center;min-height:37px;padding:4px 9px;border:1px solid var(--line);border-radius:3px;background:var(--sheet);font-size:13px}.layout{display:block;min-height:calc(100vh - 127px)}.sidebar{display:none}.workspace{padding:22px 16px 38px}.page-heading{display:block}.page-heading .button{margin-top:13px}.home-grid{grid-template-columns:1fr;gap:12px}.home-lead{padding:24px 20px}.continue-card{padding:17px}.subject-grid{grid-template-columns:1fr 1fr;gap:8px}.subject-card{padding:12px;min-height:103px}.subject-card strong{font-size:14px}.subject-card small{font-size:11px;margin-left:26px}.mode-tabs{display:none}.topic-row{grid-template-columns:1fr auto;gap:5px 9px;padding:12px 4px}.topic-row p{grid-column:1/-1;grid-row:2}.topic-row button{grid-column:2;grid-row:1}.practice-route{grid-template-columns:1fr}.route-step{min-height:0}.misconception{grid-template-columns:1fr;gap:3px}.game-grid{grid-template-columns:1fr}.memory-board{grid-template-columns:repeat(3,minmax(0,1fr));gap:6px}.memory-tile{min-height:86px;padding:7px;font-size:13px}.exam-row{grid-template-columns:1fr auto;gap:4px 9px}.exam-row .exam-status{grid-column:1}.exam-row .button{grid-column:2;grid-row:1/span 2}.matrix{display:block;overflow-x:auto;white-space:nowrap}.mobile-mode-nav{position:fixed;bottom:0;left:0;right:0;z-index:6;display:grid;grid-template-columns:repeat(5,1fr);background:rgba(255,253,248,.97);border-top:1px solid var(--line);padding:4px 4px calc(4px + env(safe-area-inset-bottom))}.mobile-mode-nav button{border:0;background:transparent;min-height:50px;display:flex;flex-direction:column;justify-content:center;align-items:center;gap:0}.mobile-mode-nav button[aria-current=page]{color:var(--green);font-weight:700}.mobile-mode-nav button span{font-size:17px;line-height:1.25}.mobile-mode-nav button small{font-size:10px}.page-footer{font-size:11px;padding-bottom:18px}}@media(max-width:380px){.wordmark{flex:0 1 auto}.old-version-link{font-size:11px}.countdown{flex:1 1 100%;order:5;justify-content:center;padding:0 0 3px}.top-actions{display:contents}.mobile-subject-trigger{margin-left:auto}.subject-grid{grid-template-columns:1fr}.question-stem{font-size:16px}.matrix{font-size:13px}}
@media(prefers-reduced-motion:reduce){*{scroll-behavior:auto!important;transition:none!important}}


/* Rich legacy and content-pack question support */
.question-figure{margin:1rem 0;padding:1rem;border:1px solid var(--line,#dbe4df);border-radius:1rem;background:var(--paper,#fff);overflow:hidden}
.question-figure svg{display:block;width:min(100%,36rem);height:auto;margin:auto}
.question-figure figcaption{margin-top:.5rem;color:var(--muted,#64748b);font-size:.88rem;text-align:center}
.question-material,.self-review{margin:.85rem 0;padding:1rem;border-radius:.85rem;background:var(--soft,#f5f7f5);line-height:1.7;overflow-wrap:anywhere}
.self-review ul{padding-left:1.35rem}
.self-review details{margin:.4rem 0}
.question-part .filter-row label{min-width:min(100%,14rem)}
@media(max-width:600px){.question-figure{padding:.5rem;margin:.7rem 0}.question-figure svg{width:100%}.question-part .filter-row{align-items:stretch}.question-part .filter-row label{width:100%}}


/* Bridge the legacy-authored game renderer into V2's visual tokens. */
.legacy-games{--brand:#386d5b;--brand-weak:#eaf2ed;--brand-mid:#d8e7dd;--card:var(--sheet);--surface:var(--sheet);--bg:var(--paper);--ink-2:var(--muted);color:var(--ink)}
.legacy-games .card{background:var(--sheet);border:1px solid var(--line);border-radius:12px;padding:16px;box-shadow:var(--shadow)}
.legacy-games .btn{border:1px solid var(--line);border-radius:8px;background:var(--sheet);padding:9px 14px;min-height:42px;color:var(--ink)}
.legacy-games .btn.primary,.legacy-games .btn.accent{background:var(--brand);color:#fff;border-color:var(--brand)}
.legacy-games .row{display:flex;align-items:center;gap:10px;flex-wrap:wrap}
.legacy-games .tag{display:inline-flex;border:1px solid var(--line);border-radius:999px;padding:2px 9px;background:var(--blue-soft);color:var(--ink)}
.legacy-games button:disabled{opacity:.7;cursor:default}

/* Lesson content blocks */
.lesson-card{margin:1rem 0;padding:1.1rem;border:1px solid var(--line);border-radius:14px;background:var(--sheet)}
.lesson-card h3{margin:.35rem 0 .6rem}
.lesson-subsection{margin:1rem 0;padding-top:.8rem;border-top:1px solid var(--line)}
.lesson-subsection h4{margin:0 0 .6rem}
.lesson-subsection ul{padding-left:1.25rem}
.lesson-subsection li{margin:.35rem 0}
.lesson-exercise{margin:.55rem 0;padding:.75rem .9rem;border:1px solid var(--line);border-radius:10px;background:var(--paper)}
.lesson-exercise summary{cursor:pointer;font-weight:650}
.lesson-exercise-body{padding:.5rem .2rem 0}
.concept-note,.interactive-note{margin:.55rem 0;padding:.75rem .9rem;border-left:3px solid var(--brand);border-radius:0 9px 9px 0;background:var(--brand-weak)}
.concept-note p,.interactive-note p{margin:.35rem 0}
.export-progress{white-space:nowrap}
@media(max-width:760px){.export-progress{font-size:.78rem;padding:.3rem .1rem}.lesson-card{padding:.85rem}.lesson-subsection{margin:.7rem 0}}

.lesson-check{margin:.7rem 0;padding:.85rem;border:1px solid var(--line);border-radius:12px;background:var(--sheet)}
.lesson-check .option-list{display:grid;gap:7px}
.lesson-check-review{margin:.6rem 0;padding:.65rem;border-radius:8px;background:var(--paper)}
.lesson-check-review summary{cursor:pointer;font-weight:650}

.activity-heading{display:flex;align-items:center;justify-content:space-between;gap:1rem;padding:1rem 0 1.25rem}
.activity-heading h1{margin:.2rem 0;font-size:clamp(1.4rem,3vw,2rem);color:var(--ink)}
.activity-mount{min-height:60vh}
.exam-companion-launch{margin:1rem 0;padding:clamp(1rem,3vw,1.6rem);border:1px solid var(--line)}
.exam-companion-launch .section-heading{margin:0}
.exam-companion-launch .badge{white-space:nowrap}
.exam-companion-launch p{max-width:72ch;color:var(--muted);line-height:1.7}
@media(max-width:600px){.activity-heading{align-items:flex-start}.activity-heading .button{white-space:nowrap}.activity-mount{padding-bottom:1rem}.exam-companion-launch .section-heading{align-items:flex-start;flex-direction:column}}

/* Imported source material keeps paragraphs, tables and field labels readable on phones. */
.reviewed-data { display:grid; grid-template-columns:minmax(6em, .7fr) minmax(0, 1.5fr); gap:.35rem .75rem; }
.reviewed-data dt { font-weight:600; overflow-wrap:anywhere; }
.reviewed-data dd { margin:0; min-width:0; overflow-wrap:anywhere; }
.reviewed-data ul { padding-left:1.2em; margin:.2em 0; }
.reviewed-table { max-width:100%; overflow:auto; }
.reviewed-source { margin:.8rem 0; font-size:.9rem; }
.reviewed-source p, .question-material { white-space:pre-wrap; overflow-wrap:anywhere; }
#semantic-filter { max-width:100%; }

.speaking-practice{max-width:760px;margin:auto}.speaking-practice label{display:block;margin:14px 0}.speaking-practice select,.speaking-practice textarea{display:block;max-width:100%;width:100%;padding:10px;font:inherit}.speaking-practice audio{max-width:100%;width:100%}.speaking-practice fieldset{min-width:0;margin:20px 0;border:1px solid #c5d2d2;border-radius:12px;padding:16px}.speaking-practice [lang=en]{font-size:1.18rem;line-height:1.7}

.listening-practice{max-width:760px;margin:auto}.listening-practice audio{width:100%;margin:1rem 0}.listening-practice fieldset{min-width:0;margin:1rem 0}.listening-practice fieldset label{display:flex;gap:.5rem;align-items:center;margin:.8rem 0}.listening-practice input{width:auto}.listening-practice select{max-width:100%}

.solution-lab{max-width:760px;margin:auto}.solution-lab label{display:block;margin:1rem 0}.solution-lab textarea,.solution-lab select,.solution-lab input{display:block;width:100%;max-width:100%;box-sizing:border-box;margin:.5rem 0;padding:.6rem}.solution-lab textarea{min-height:100px}.solution-lab [data-solution-feedback]{overflow-wrap:anywhere}

.density-lab figure{margin:1rem 0}.density-lab figure svg{display:block;width:100%;max-width:360px;margin:auto}.density-lab figcaption{font-size:.875rem;font-weight:normal}

.lab-record-hint { display:block; margin:.45rem 0; color:var(--muted, #56605b); font-size:.9rem; line-height:1.65; font-weight:normal; }

/* Tablet-width headers keep search/export/navigation on a second flexible row. */
@media (min-width:701px) and (max-width:1100px) {
  .topbar { flex-wrap:wrap; }
  .top-actions { flex:1 0 100%; min-width:0; flex-wrap:wrap; }
  .top-actions .search-box { flex:1 1 220px; min-width:0; }
}

.listening-practice .listening-notes label{display:block}.listening-notes textarea{display:block;width:100%;max-width:100%;min-height:80px;margin:.4rem 0;padding:.6rem}.listening-practice [data-listening-notes-review]{overflow-wrap:anywhere}

/* Preserve authored dialogue and stage-direction line breaks. */
.solution-lab > section > p{white-space:pre-line}