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@media(max-width:1100px){.daily-layout{grid-template-columns:1fr}.daily-aside{grid-template-columns:1fr 1fr}.daily-steps{grid-template-columns:repeat(2,minmax(0,1fr))}}
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@media(max-width:700px){.curriculum-toolbar{grid-template-columns:1fr}.curriculum-toolbar .field{margin-bottom:0}.curriculum-toolbar{margin-bottom:16px}.chapter-total strong{font-size:30px}.chapter-total{min-width:85px}.chapter-links{align-items:stretch}.chapter-links .button{white-space:normal;text-align:center}.lesson-article{overflow-wrap:anywhere}}

/* Windows-inspired dark surfaces. Semantic answer colors stay distinct from blue actions. */
[hidden]{display:none!important}
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.sidebar{background:#1b1b1b}.topbar{background:#202020;color:var(--muted)}
.brand-symbol{background:var(--accent);color:var(--on-accent);border-radius:8px}.brand small,.nav-caption,.local-status,.focus-card p,footer{color:var(--muted)}
.nav-item{color:#d4d4d4;border-radius:5px;position:relative}.nav-item:hover{background:#303030}.nav-item.active{background:#343434;color:var(--ink)}
.nav-item.active::before{content:"";position:absolute;left:0;top:25%;height:50%;width:3px;border-radius:3px;background:var(--accent)}
.nav-item .nav-count{background:#233747;color:var(--accent)}.focus-card{background:#252525;border-color:var(--line)}.focus-time{color:var(--ink)}.local-status i{background:var(--accent)}.avatar{background:#324355;color:#d8eeff}
.button,.kind-tab,.question-number{background:#333;color:var(--ink);border-color:#666;border-radius:5px}.button:hover{background:#3d3d3d;border-color:#999}.button.primary{background:var(--accent);color:var(--on-accent);border-color:var(--accent)}.button.primary:hover{background:var(--accent-hover);border-color:var(--accent-hover)}.button.quiet{background:transparent;color:var(--accent);border-color:transparent}.button.quiet:hover{background:#343434}.button.danger{color:var(--red);border-color:#b8716c}
.badge{background:var(--mint);color:var(--accent)}.badge.gray{background:#3a3a3a;color:#dedede}.badge.amber{background:var(--warning-bg);color:var(--orange)}.badge.red{background:var(--danger-bg);color:var(--red)}
.hero{background:#2c2c2c;border-color:var(--line)}.hero .eyebrow{color:var(--accent)}.hero .intro,.goal-ring small{color:#c6c6c6}.goal-ring circle{stroke:#4b4b4b}.goal-ring .fill{stroke:var(--accent)}
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input,select,textarea{background:var(--control);color:var(--ink);border-color:var(--control-border);border-radius:5px}input::placeholder,textarea::placeholder{color:#a6a6a6;opacity:1}input:focus,select:focus,textarea:focus{outline-color:var(--accent)}button:focus-visible,a:focus-visible,summary:focus-visible{outline:2px solid var(--accent);outline-offset:3px}
.kind-tab.active{background:#233747;border-color:var(--accent)}.kind-tab.active strong{color:var(--accent)}.active-banner{background:#253442;border-color:#556979}
.option{background:#2c2c2c;border-color:#777}.option:hover{background:#363636}.option:has(input:checked){background:#233747;border-color:var(--accent)}.option .letter{color:#d4d4d4}.option.correct{background:var(--success-bg);border-color:#6da982}.option.incorrect{background:var(--danger-bg);border-color:#c28a82}.option.correct:has(input:checked){background:var(--success-bg);border-color:#6da982}.option.incorrect:has(input:checked){background:var(--danger-bg);border-color:#c28a82}
.explanation{background:var(--success-bg);border-color:#527d60}.explanation.wrong{background:var(--danger-bg);border-color:#a47069}.question-number.answered{background:#233747;border-color:#6f9db8}.question-number.right{background:var(--success-bg);color:var(--success-text);border-color:#6da982}.question-number.wrong{background:var(--danger-bg);color:var(--red);border-color:#c28a82}.written-result{background:#222}.result-banner{background:#253442}
.toast{background:#343434;color:var(--ink);border:1px solid #727272}.toast.error{background:var(--danger-bg);color:var(--red)}dialog{background:#292929;color:var(--ink);border-color:#777;border-radius:8px}dialog::backdrop{background:#0009;backdrop-filter:blur(4px)}.skip-link{background:#303030;color:var(--accent)}
.daily-steps li{background:#303030}.daily-steps a:hover{background:#383838}.daily-steps span{border-color:#777}.daily-steps .done{background:#233747;border-color:#7199b4}.daily-steps .done span{background:var(--accent);color:var(--on-accent);border-color:var(--accent)}.course-example{background:#233747}.course-stage-bars span{background:#3a3a3a;color:#dedede}.course-stage-bars .done{background:#233747;color:#b5e8ff}
/* Lesson text remains the primary learning surface; book pages are references. */
.coach-copy{max-width:78ch;margin-inline:auto}.coach-text{white-space:pre-line;overflow-wrap:anywhere;line-height:1.9;font-size:16px}.coach-objectives{padding:20px;border-left:3px solid var(--accent);background:#233747;border-radius:5px}.coach-objectives ul,.coach-sources ul{padding-left:24px}.coach-objectives li{margin:8px 0}.coach-outline{display:flex;gap:8px;flex-wrap:wrap;margin:22px 0}.coach-outline .button{white-space:normal;text-align:left;min-height:44px}.coach-section{padding-block:16px;scroll-margin-top:28px}.coach-section h3{line-height:1.5}.coach-section:focus{outline:2px solid var(--accent);outline-offset:8px}.worked-example{margin:18px 0;padding:20px;border:1px solid var(--line);border-radius:6px;background:#252525}.worked-example h4{font-size:17px;margin:0 0 14px}.worked-example details{border-top:1px solid var(--line);padding-top:10px;margin-top:16px}.worked-example summary,.coach-sources summary{cursor:pointer;padding:10px 0;min-height:44px;color:var(--accent);font-weight:600}.worked-example ol{padding-left:24px}.worked-example li{margin:14px 0}.coach-recall{padding:18px 20px;background:#303030;border-radius:6px}.coach-sources{font-size:14px;margin-top:24px}.coach-due{margin-bottom:22px}.coach-due .row{gap:14px;border-top:1px solid var(--line);padding:14px 0}.coach-retest{margin:20px 0}.coach-retest h2{font-size:18px}.coach-retest .card-head{flex-wrap:wrap;gap:10px}.coach-retest p{margin-block:12px}.coach-evidence{display:flex;gap:8px;flex-wrap:wrap;margin:10px 0}.coach-rubric{border:0;padding:0;margin:0}.coach-rubric label{display:flex;gap:12px;align-items:flex-start;padding:12px;border:1px solid var(--line);border-radius:5px;margin:8px 0;font-size:15px;line-height:1.7}.coach-rubric input{flex:0 0 18px;width:18px;min-height:18px;height:18px;margin-top:4px}.coach-rubric legend{font-weight:600;font-size:16px;margin-bottom:8px}.coach-retake-reflection{max-width:78ch;margin:22px auto}
@media(max-width:700px){.worked-example,.coach-objectives{padding:16px}.coach-outline{flex-direction:column}.coach-outline .button{justify-content:flex-start}.coach-due .row{align-items:flex-start}.coach-copy{max-width:100%}}

/* Textbook-first lessons: keep the reading surface wide, with notes alongside. */
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@media(max-width:1399px){.lesson-reading-layout{grid-template-columns:1fr}.inline-book{width:100%;max-width:860px;margin-inline:auto}.inline-lecture{position:static;max-height:none;overflow:visible;max-width:85ch;margin-inline:auto;width:100%}.inline-lecture .coach-outline{flex-direction:row}.inline-lecture .coach-section{margin:20px 0}}
@media(max-width:760px){.lesson-goals,.lesson-aftercare{grid-template-columns:1fr}.lesson-priorities{padding:16px}.lesson-reading-card{padding:16px}.inline-book-pager{justify-content:center;gap:8px}.inline-book-pager form{order:3;justify-content:center;flex-basis:100%}.inline-book-pager .button{flex:1}.inline-book-pager form .button{flex:0}.inline-lecture{padding:16px}.lesson-flow h2{font-size:19px}.lesson-goals{gap:16px}.lesson-examples .worked-example{padding:16px}.lesson-aftercare .coach-due{grid-column:auto}}
.lesson-videos{margin-top:28px;padding-top:24px;border-top:1px solid var(--line)}.lesson-video-list{display:grid;grid-template-columns:repeat(auto-fit,minmax(min(100%,260px),1fr));gap:12px;margin:16px 0}.lesson-video-item{min-width:0;padding:16px;border:1px solid var(--line);border-radius:6px}.lesson-video-item h4{margin:0 0 8px}.lesson-video-item p{margin:8px 0 14px}.lesson-video-view{margin:20px 0;padding:16px;background:var(--bg);border:1px solid var(--line);border-radius:6px}.lesson-video-view[hidden]{display:none}.lesson-video-view iframe{display:block;width:100%;aspect-ratio:16/9;min-height:240px;border:0;background:#111}.lesson-video-sources{margin-top:16px}.lesson-video-sources summary{cursor:pointer;padding:10px 0}.lesson-videos a,.lesson-videos p{overflow-wrap:anywhere}.lesson-videos a:focus-visible,.lesson-videos summary:focus-visible{outline:2px solid var(--accent);outline-offset:3px}
/* Original book pages retain their ink/paper colors; never invert diagrams. */
.reader-sheet{background:#fff;border-color:#777}
::selection{background:#60cdff55;color:#fff}
/* Six-step learning: explicit evidence, readable forms, native keyboard controls. */
.six-step-path,.flow-overview{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:12px}
.six-step-path a{height:100%}.six-step-path small{line-height:1.6}.flow-stage-bars{grid-template-columns:repeat(6,minmax(0,1fr))}
.flow-overview{margin:20px 0}.flow-overview>div{padding:18px;background:var(--surface);border:1px solid var(--line);border-radius:6px}.flow-overview p{margin:8px 0}
.guided-practice{margin-top:28px}.guided-practice fieldset{padding:0;border:0;min-width:0}.guided-practice legend{font-weight:600;margin:20px 0 12px}.guided-step,.repair-item{padding:20px;margin:18px 0;border:1px solid var(--line);border-radius:6px;background:#252525}
.guided-step h4,.repair-item h3{margin:0 0 16px}.guided-step .field,.repair-item .field{display:flex;flex-direction:column;gap:8px;margin-top:18px}.guided-step .row,.repair-item .row{margin:16px 0}.guide-reference{padding:16px;background:var(--mint);margin:16px 0}
.flow-check{display:flex;align-items:flex-start;gap:12px;font-size:15px;line-height:1.8;margin:18px 0;cursor:pointer}.flow-check input{width:18px;height:18px;min-height:18px;flex-shrink:0;margin-top:4px}.repair-item details,.repair-history{margin:16px 0}.repair-item summary,.repair-history summary,.guided-practice summary{padding:12px 0;cursor:pointer;color:var(--accent)}.repair-history article{border-top:1px solid var(--line);padding:18px 0}
.repair-item select{max-width:100%;white-space:normal}.repair-item p[role=status],#guidance-status{margin-top:14px;font-size:14px;line-height:1.7;color:var(--muted)}.daily-section{scroll-margin-top:24px}.daily-section:focus-visible{outline:2px solid var(--accent);outline-offset:4px}.guided-practice button,.repair-item button{min-height:44px;white-space:normal}
@media(max-width:760px){.six-step-path,.flow-overview{grid-template-columns:1fr 1fr}.flow-stage-bars{grid-template-columns:repeat(3,minmax(0,1fr))}.guided-step,.repair-item{padding:16px}.guide-reference{padding:12px}}
@media(max-width:420px){.six-step-path,.flow-overview{grid-template-columns:1fr}.six-step-path a{min-height:76px}}
.login-page{min-height:100vh;display:grid;place-items:center;padding:28px 18px}.login-card{width:min(100%,420px);padding:32px}.login-card h1{font-size:26px;margin:22px 0 10px}.login-card .field{margin-top:20px}.login-card label,.login-card .field>span{font-size:14px}.login-card p{font-size:14px;color:var(--muted)}.login-card input{width:100%}.login-card .button{min-height:44px}.login-card .callout{margin:15px 0}.login-brand{display:flex;gap:12px;align-items:center;font-size:18px;font-weight:600}.login-help{margin-top:20px}.login-password-row{display:flex;gap:8px}.login-password-row input{flex:1}.login-error{color:var(--red)!important;min-height:24px;margin-top:12px}
@media(forced-colors:active){.nav-item.active::before{background:Highlight}.course-stage-bars .done{border:1px solid Highlight}.button.primary{border:2px solid ButtonText}}

/* Syllabus navigation and two-ended book paging share the existing dark tokens. */
.reader-context{display:flex;align-items:center;justify-content:space-between;gap:18px;margin-bottom:18px}.reader-context p{max-width:760px}.reader-pager{display:flex;align-items:center;justify-content:space-between;flex-wrap:wrap;gap:18px;padding:18px 22px;margin:20px 0}.reader-page-turn{display:flex;align-items:center;gap:24px;flex-wrap:wrap}.reader-page-count{font-size:16px;font-variant-numeric:tabular-nums;white-space:nowrap}.reader-jump{display:flex;align-items:center;gap:10px;flex-wrap:wrap}.reader-jump label{font-size:14px}.reader-jump input{width:88px;min-height:44px}.reader-pager .button{min-height:44px}.reader-return{justify-content:center;margin:24px 0}.reader-sheet img{display:block;width:100%;height:auto}.course-pager{display:grid;grid-template-columns:minmax(0,1fr) auto minmax(0,1fr);gap:12px;margin:22px 0}.course-pager .button{display:flex;flex-direction:column;align-items:flex-start;justify-content:center;white-space:normal;text-align:left;min-height:70px;gap:5px;overflow-wrap:anywhere}.course-pager .button:last-child{align-items:flex-end;text-align:right}.course-pager small{color:var(--muted);font-size:12px}.course-pager span{font-size:14px}.course-pager .quiet{align-items:center;text-align:center}.scope-list{padding:16px 20px;border:1px solid var(--line);border-radius:6px}.scope-list ul{margin:12px 0;padding-left:20px;columns:2;column-gap:30px}.scope-list li{break-inside:avoid;font-size:14px;margin:6px 0}.subject-progress{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:20px;margin:20px 0 28px}.subject-progress section{padding:16px;border:1px solid var(--line);border-radius:6px}.subject-progress p{margin:8px 0}.syllabus-links{margin:20px 0}.syllabus-group{border-top:1px solid var(--line);margin:0;padding:0}.syllabus-group>summary{display:flex;align-items:center;justify-content:space-between;gap:14px;cursor:pointer;padding:20px 6px;min-height:48px;list-style:none}.syllabus-group>summary:before{content:'›';font-size:22px;color:var(--accent)}.syllabus-group[open]>summary:before{content:'⌄'}.syllabus-group>summary span{flex:1;font-weight:600}.syllabus-group>summary small{white-space:nowrap;color:var(--muted)}.syllabus-group .course-map-row{margin-left:22px}.syllabus-group .module-index{min-width:38px;font-size:14px}.syllabus-group summary:focus-visible{outline:2px solid var(--accent);outline-offset:-2px}.course-map-title h3 a:hover{text-decoration:underline}
@media(max-width:700px){.reader-context{align-items:flex-start;flex-direction:column}.reader-pager{padding:16px;gap:14px}.reader-page-turn,.reader-jump{width:100%;justify-content:space-between;gap:10px}.reader-page-turn .row{flex:1;justify-content:flex-end}.reader-page-turn .button{padding:10px 12px}.reader-jump label{flex:1}.course-pager{grid-template-columns:1fr 1fr;gap:8px}.course-pager .quiet{grid-column:1/-1;grid-row:2;min-height:44px;flex-direction:row;gap:10px}.course-pager .button{padding:12px}.scope-list ul{columns:1}.subject-progress{grid-template-columns:1fr;gap:10px}.syllabus-group>summary{padding:16px 0}.syllabus-group>summary small{font-size:12px}.syllabus-group .course-map-row{margin-left:0}.course-map-title{gap:8px}}

/* One-click course printing keeps the interactive workspace off paper. */
.lesson-print-sheet{position:absolute;left:-99999px;width:210mm;visibility:hidden}
@media print{
  @page{size:A4;margin:14mm}
  html,body{background:#fff!important;color:#111!important}
  body>*:not(#lesson-print-sheet){display:none!important}
  #lesson-print-sheet{display:block!important;position:static;left:auto;visibility:visible;width:auto;max-width:none;color:#111;background:#fff;font:11pt/1.55 "Microsoft YaHei",sans-serif}
  #lesson-print-sheet header{border-bottom:2px solid #222;margin-bottom:12mm;padding-bottom:5mm}
  #lesson-print-sheet h1{font-size:19pt;margin:3mm 0}#lesson-print-sheet h2{font-size:15pt;margin:9mm 0 4mm}#lesson-print-sheet h3{font-size:12pt;margin:6mm 0 3mm}
  #lesson-print-sheet p,#lesson-print-sheet li{color:#111;font-size:11pt;line-height:1.55;overflow-wrap:anywhere}
  #lesson-print-sheet .lesson-goals{display:block}#lesson-print-sheet .lesson-priorities{background:#fff;border:0;padding:0}
  #lesson-print-sheet .print-book-page{break-before:page;break-after:page;page-break-before:always;page-break-after:always}
  #lesson-print-sheet .print-book-page h3{margin:0 0 3mm;font-size:10pt}
  #lesson-print-sheet .print-book-page img{display:block;width:100%;max-height:247mm;object-fit:contain;margin:auto}
  #lesson-print-sheet .print-lecture section,#lesson-print-sheet .print-examples section{break-inside:avoid-page;page-break-inside:avoid}
  #lesson-print-sheet .print-notes{break-before:page;page-break-before:always}
}