:root{
  --bg:#090b10;--bg2:#050608;--panel:#15181f;--panel2:#1d222b;--surface:#202630;
  --ink:#f7f2e8;--muted:#b9b2a7;--gold:#d8b45f;--gold2:#f1d98d;--blue:#78afe9;
  --green:#78d699;--red:#ee9191;--line:rgba(216,180,95,.27);--soft:rgba(255,255,255,.09);
  --grid:rgba(255,255,255,.045);--shadow:0 22px 62px rgba(0,0,0,.38);
  --radius:13px;--max:1440px;--sans:"Brandon Grotesque","Avenir Next","Segoe UI",Inter,system-ui,sans-serif;
  --display:"Cinzel","Baskerville","Palatino Linotype",Georgia,serif;--bg2:#eee9df;--panel:#fffdfa;--panel2:#f0ece4;--surface:#fff;
  --ink:#15202d;--muted:#65717f;--line:rgba(139,105,37,.25);--soft:rgba(21,32,45,.12);
  --grid:rgba(21,32,45,.04);--shadow:0 20px 56px rgba(38,32,22,.13)
}
*{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:100px;color-scheme:dark}
html[data-theme="light"]{color-scheme:light}
body{
  margin:0;min-width:320px;min-height:100vh;overflow-x:hidden;color:var(--ink);
  font:16px/1.68 var(--sans);
  background:
    radial-gradient(circle at 12% 0,rgba(120,175,233,.14),transparent 29rem),
    radial-gradient(circle at 88% 3%,rgba(216,180,95,.14),transparent 31rem),
    linear-gradient(145deg,var(--bg2),var(--bg) 48%,var(--bg2))
}
body::before{content:"";position:fixed;inset:0;z-index:-1;pointer-events:none;background-image:linear-gradient(var(--grid) 1px,transparent 1px),linear-gradient(90deg,var(--grid) 1px,transparent 1px);background-size:33px 33px;mask-image:linear-gradient(to bottom,#000,transparent 80%)}
a{color:inherit}button,input,select,textarea{font:inherit}button{cursor:pointer;color:inherit}
[hidden]{display:none!important}:focus-visible{outline:3px solid rgba(216,180,95,.45);outline-offset:3px}
::selection{background:var(--gold);color:#171006}
.wrap{width:min(calc(100% - 42px),var(--max));margin-inline:auto}
.skip{position:fixed;left:12px;top:10px;z-index:5000;transform:translateY(-170%);padding:9px 12px;border-radius:9px;background:#000;color:#fff}.skip:focus{transform:none}
.sr-only{position:absolute!important;width:1px!important;height:1px!important;padding:0!important;margin:-1px!important;overflow:hidden!important;clip:rect(0,0,0,0)!important;white-space:nowrap!important;border:0!important}
.site-header{position:sticky;top:0;z-index:1200;border-bottom:1px solid var(--soft);background:color-mix(in srgb,var(--bg) 92%,transparent);backdrop-filter:blur(18px);box-shadow:0 10px 30px rgba(0,0,0,.16)}
.header-inner{min-height:82px;display:flex;align-items:center;justify-content:space-between;gap:18px;padding-block:10px}
.brand-group{display:flex;align-items:center;gap:12px;min-width:0}
.brand-home,.hero-badge{display:grid;place-items:center;border:1px solid rgba(216,180,95,.7);border-radius:13px;color:#171006;background:linear-gradient(145deg,#faebba,#d8b45f);font:800 1.08rem/1 var(--display);text-decoration:none;box-shadow:0 10px 25px rgba(216,180,95,.16)}
.brand-home{width:50px;height:50px;flex:0 0 50px}.hero-badge{width:62px;height:62px;margin:0 auto 20px}
.brand-home:hover,.hero-badge:hover{transform:translateY(-2px)}
.brand-copy{min-width:0;text-decoration:none;line-height:1.14}.brand-copy strong{display:block;font-family:var(--display);font-size:.96rem;font-weight:650;letter-spacing:.085em;text-transform:uppercase}.brand-copy small{display:block;margin-top:6px;color:var(--muted);font-size:.72rem;letter-spacing:.055em}
.header-tools{display:flex;align-items:center;justify-content:flex-end;gap:8px;flex-wrap:wrap}
.header-control,.course-menu>summary,.icon-btn{
  min-height:40px;display:inline-flex;align-items:center;justify-content:center;padding:8px 12px;border:1px solid var(--soft);border-radius:11px;color:var(--ink);background:color-mix(in srgb,var(--panel) 90%,transparent);font-size:.73rem;font-weight:740;letter-spacing:.035em;text-decoration:none;list-style:none
}
.header-control:hover,.course-menu>summary:hover,.icon-btn:hover{border-color:var(--line);background:var(--panel2)}
.pin-control[aria-pressed="true"]{color:#171006;background:linear-gradient(135deg,var(--gold),var(--gold2));border-color:transparent}
.course-menu{position:relative}.course-menu>summary::-webkit-details-marker{display:none}
.course-menu-panel{position:absolute;right:0;top:calc(100% + 9px);width:min(320px,calc(100vw - 28px));padding:10px;border:1px solid var(--line);border-radius:13px;background:var(--panel);box-shadow:var(--shadow)}
.course-menu-panel a,.course-menu-panel button{width:100%;min-height:42px;display:flex;align-items:center;padding:9px 11px;border:0;border-radius:9px;color:var(--ink);background:transparent;text-align:left;text-decoration:none;font-size:.82rem}.course-menu-panel a:hover,.course-menu-panel button:hover{background:var(--panel2)}.course-menu-panel hr{border:0;border-top:1px solid var(--soft);margin:8px 0}
.breadcrumb{border-bottom:1px solid var(--soft);background:color-mix(in srgb,var(--panel) 78%,transparent)}.breadcrumb .wrap{min-height:43px;display:flex;align-items:center;justify-content:center;gap:8px;flex-wrap:wrap;color:var(--muted);font-size:.76rem}.breadcrumb a{color:var(--ink);text-decoration:none}
.hero{position:relative;overflow:hidden;padding:clamp(80px,9vw,132px) 0 clamp(72px,8vw,112px);border-bottom:1px solid var(--soft);background:radial-gradient(circle at 50% -20%,rgba(216,180,95,.24),transparent 34rem),radial-gradient(circle at 9% 12%,rgba(96,165,250,.18),transparent 30rem)}
.hero::before{content:"";position:absolute;left:50%;top:-235px;width:830px;height:830px;transform:translateX(-50%);border:1px solid rgba(216,180,95,.08);border-radius:50%;box-shadow:0 0 0 72px rgba(216,180,95,.025),0 0 0 144px rgba(216,180,95,.018);pointer-events:none}
.hero .wrap{position:relative;z-index:1;text-align:center}.eyebrow{margin:0;color:var(--gold2);font-size:.76rem;font-weight:760;letter-spacing:.15em;text-transform:uppercase}
.hero h1{max-width:1150px;margin:14px auto 0;font:540 clamp(2.65rem,6vw,5.8rem)/.98 var(--display);letter-spacing:-.038em;text-wrap:balance}.hero .lead{max-width:930px;margin:22px auto 0;color:var(--muted);font-size:clamp(1rem,1.6vw,1.16rem);line-height:1.82}
.actions{display:flex;align-items:center;gap:10px;flex-wrap:wrap;margin-top:24px}.hero .actions{justify-content:center;margin-top:31px}
.btn,.button{min-height:44px;display:inline-flex;align-items:center;justify-content:center;padding:10px 15px;border:1px solid var(--line);border-radius:11px;color:var(--ink);background:var(--panel);font-size:.78rem;font-weight:750;text-decoration:none;text-align:center;transition:.16s}.btn:hover,.button:hover{transform:translateY(-1px);background:var(--panel2)}.btn.primary,.button.primary{color:#171006;background:linear-gradient(135deg,var(--gold),var(--gold2));border-color:transparent}.btn.gold{color:#171006;background:linear-gradient(135deg,#e4c36f,#f0d98f);border-color:transparent}.btn.danger{color:#fff;background:#8a3f49}.btn.disabled{opacity:.55}
.snapshot{width:min(1080px,100%);display:grid;grid-template-columns:repeat(6,1fr);margin:39px auto 0;border:1px solid var(--line);border-radius:13px;overflow:hidden;background:color-mix(in srgb,var(--panel) 73%,transparent);box-shadow:var(--shadow)}
.metric{padding:19px 12px;border-left:1px solid var(--soft)}.metric:first-child{border-left:0}.metric strong{display:block;color:var(--gold2);font:650 1.46rem var(--display)}.metric span{display:block;margin-top:5px;color:var(--muted);font-size:.72rem}
.quick-nav{position:sticky;top:82px;z-index:900;border-bottom:1px solid var(--soft);background:color-mix(in srgb,var(--bg) 94%,transparent);backdrop-filter:blur(15px)}.quick-nav-inner{min-height:58px;display:flex;align-items:center;justify-content:center;gap:7px;overflow-x:auto;padding-block:8px;scrollbar-width:thin}.quick-nav button{flex:0 0 auto;min-height:38px;padding:7px 11px;border:1px solid var(--soft);border-radius:9px;color:var(--muted);background:transparent;font-size:.72rem;font-weight:730}.quick-nav button:hover,.quick-nav button.active{color:#171006;background:var(--gold);border-color:transparent}
main{padding:clamp(56px,7vw,92px) 0 100px}.view{display:none}.view.active{display:block}.section{padding:clamp(55px,7vw,90px) 0}.section-head{max-width:910px;margin:0 auto 35px;text-align:center}.section-head h2{margin:10px 0 0;font:550 clamp(2rem,4vw,3.7rem)/1.05 var(--display)}.section-head p:not(.eyebrow){color:var(--muted)}
.grid{display:grid;grid-template-columns:repeat(12,minmax(0,1fr));gap:17px}.col3{grid-column:span 3}.col4{grid-column:span 4}.col6{grid-column:span 6}.col8{grid-column:span 8}.col12{grid-column:1/-1}
.card,.day-card,.question,.lesson-section{min-width:0;padding:clamp(20px,2.4vw,31px);border:1px solid var(--soft);border-radius:13px;background:linear-gradient(145deg,color-mix(in srgb,var(--panel) 95%,transparent),color-mix(in srgb,var(--panel2) 93%,transparent));box-shadow:var(--shadow)}
.card h2,.card h3,.card h4,.day-card h4,.lesson-section h2,.lesson-section h3{font-family:var(--display);font-weight:600}.card h3{font-size:1.35rem}.card p,.day-card p,.card li,.lesson-section p,.lesson-section li{color:var(--muted)}.card a:not(.btn):not(.button){color:var(--gold2)}
.progress{height:10px;overflow:hidden;border-radius:999px;background:var(--panel2)}.progress span{display:block;height:100%;background:linear-gradient(90deg,var(--blue),var(--gold))}
.pill{display:inline-flex;margin:3px 4px 3px 0;padding:5px 8px;border:1px solid var(--soft);border-radius:999px;color:var(--muted);font-size:.7rem}.pill.good{color:var(--green);border-color:color-mix(in srgb,var(--green) 45%,transparent)}.pill.warn{color:var(--gold2)}.score{color:var(--gold2);font:650 2rem var(--display)}
.notice{padding:13px;border-left:3px solid var(--gold);border-radius:7px;background:color-mix(in srgb,var(--gold) 8%,transparent)}.error{color:var(--red)}.success{color:var(--green)}
.form-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:12px}label{display:grid;gap:6px;color:var(--muted);font-size:.78rem;font-weight:720}input,select,textarea{width:100%;min-height:43px;padding:9px 11px;border:1px solid var(--soft);border-radius:9px;color:var(--ink);background:var(--bg)}textarea{min-height:130px;resize:vertical}
.week-picker{display:grid;grid-template-columns:repeat(12,minmax(0,1fr));gap:7px}.week-chip{min-height:48px;border:1px solid var(--soft);border-radius:9px;color:var(--muted);background:var(--bg);font-size:.65rem}.week-chip strong{display:block;color:var(--ink);font-size:.9rem}.week-chip.active{color:#171006;background:var(--gold);border-color:transparent}.week-chip.active strong{color:#171006}.week-chip.done{box-shadow:inset 0 -3px var(--green)}
.daily-grid{display:grid;grid-template-columns:repeat(5,minmax(0,1fr));gap:14px;margin-top:15px}.day{color:var(--gold2);font-size:.72rem;font-weight:800;letter-spacing:.08em;text-transform:uppercase}
.unit-grid,.resource-grid,.lesson-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:17px}.resource-grid>a,.lesson-grid>a{text-decoration:none}.unit-card{border-top:4px solid var(--accent)}.unit-number{width:47px;height:47px;display:grid;place-items:center;border-radius:11px;color:#fff;background:var(--accent);font-weight:800}
.practice-layout{display:grid;grid-template-columns:minmax(0,1fr) 330px;gap:17px;align-items:start}.practice-side{position:sticky;top:158px}.options{display:grid;gap:8px;margin-top:12px}.option{display:flex;grid-template-columns:auto 1fr;align-items:flex-start;gap:9px;padding:10px;border:1px solid var(--soft);border-radius:9px}.option input{width:auto;min-height:auto;margin-top:4px}.feedback{margin-top:10px;padding:10px;border-radius:9px}.feedback.good{color:var(--green);background:color-mix(in srgb,var(--green) 9%,transparent)}.feedback.bad{color:var(--red);background:color-mix(in srgb,var(--red) 9%,transparent)}
.table-wrap{overflow:auto;border-radius:9px}table{width:100%;border-collapse:collapse;min-width:720px}th,td{padding:11px;border-bottom:1px solid var(--soft);text-align:left;vertical-align:top}th{color:var(--gold2);font-size:.72rem;text-transform:uppercase}td{color:var(--muted)}
.footer{border-top:1px solid var(--soft);background:var(--panel)}.footer-inner{min-height:74px;display:flex;align-items:center;justify-content:space-between;gap:16px;color:var(--muted);font-size:.75rem}
.lesson-hero{padding:70px 0 48px;text-align:center}.lesson-hero h1{max-width:1000px;margin:12px auto 0;font:550 clamp(2.3rem,5vw,4.7rem)/1.02 var(--display);letter-spacing:-.03em}.lesson-hero p{max-width:850px;margin:18px auto 0;color:var(--muted)}.lesson-layout{display:grid;grid-template-columns:minmax(0,1fr) 310px;gap:18px;align-items:start;padding-bottom:90px}.lesson-main{display:grid;gap:18px}.lesson-side{position:sticky;top:104px;display:grid;gap:14px}.formula{padding:18px;border:1px solid var(--line);border-radius:11px;color:var(--gold2);background:var(--bg);font:600 1.1rem/1.55 ui-monospace,SFMono-Regular,Consolas,monospace;overflow-wrap:anywhere}.worked{display:grid;gap:10px;margin-top:12px}.worked article{padding:14px;border:1px solid var(--soft);border-radius:10px;background:var(--bg)}.worked strong{display:block;color:var(--ink)}.worked span{display:block;margin-top:6px;color:var(--muted)}
.checklist{display:grid;gap:8px}.checklist label{display:flex;align-items:flex-start;gap:9px;padding:8px;border:1px solid var(--soft);border-radius:9px}.checklist input{width:auto;min-height:auto;margin-top:4px}
.pathway-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:12px}.pathway{padding:15px;border:1px solid var(--soft);border-radius:10px;background:var(--bg)}.pathway h4{margin:0;color:var(--gold2)}
.unit-hero{padding:65px 0 40px;text-align:center}.unit-hero h1{max-width:1000px;margin:12px auto 0;font:550 clamp(2.4rem,5vw,4.8rem)/1.03 var(--display)}.unit-hero p{max-width:850px;margin:16px auto;color:var(--muted)}
.assessment-shell{width:min(calc(100% - 28px),1000px);margin:50px auto 90px}.assessment-head{text-align:center;margin-bottom:28px}.assessment-head h1{font:560 clamp(2.2rem,5vw,4.2rem)/1.02 var(--display)}.assessment-controls{display:flex;gap:10px;justify-content:center;flex-wrap:wrap}.question{margin-bottom:13px}.question legend{font-weight:700}.assessment-result{padding:18px;border:1px solid var(--line);border-radius:12px;background:var(--panel);text-align:center}
@media(max-width:1100px){.snapshot{grid-template-columns:repeat(3,1fr)}.metric:nth-child(4){border-left:0}.daily-grid{grid-template-columns:repeat(2,1fr)}.unit-grid,.resource-grid,.lesson-grid{grid-template-columns:repeat(2,1fr)}.lesson-layout{grid-template-columns:1fr}.lesson-side{position:static}}
@media(max-width:900px){.header-inner{align-items:flex-start}.header-tools{max-width:460px}.quick-nav{top:104px}.col3,.col4,.col6,.col8{grid-column:1/-1}.practice-layout{grid-template-columns:1fr}.practice-side{position:static}.week-picker{grid-template-columns:repeat(8,1fr)}}
@media(max-width:700px){.wrap{width:min(calc(100% - 24px),var(--max))}.header-inner{display:grid}.brand-group{justify-content:center}.header-tools{justify-content:center;max-width:none}.quick-nav{top:142px}.snapshot{grid-template-columns:repeat(2,1fr)}.metric:nth-child(odd){border-left:0}.daily-grid,.unit-grid,.resource-grid,.lesson-grid,.form-grid,.pathway-grid{grid-template-columns:1fr}.week-picker{grid-template-columns:repeat(6,1fr)}.footer-inner{justify-content:center;flex-wrap:wrap;text-align:center}}
@media(max-width:480px){.header-tools{display:grid;grid-template-columns:1fr 1fr}.course-menu{grid-column:1/-1}.course-menu>summary{width:100%}.quick-nav{position:relative;top:auto}.snapshot{grid-template-columns:1fr}.metric{border-left:0;border-top:1px solid var(--soft)}.metric:first-child{border-top:0}.week-picker{grid-template-columns:repeat(4,1fr)}}
@media print{.site-header,.breadcrumb,.hero,.quick-nav,.no-print,.header-tools,.lesson-side{display:none!important}body{color:#111;background:#fff}.view{display:none!important}.view.active{display:block!important}.card,.day-card,.question,.lesson-section{box-shadow:none;border:1px solid #aaa;background:#fff;color:#111}.card p,.day-card p,.card li,.lesson-section p,.lesson-section li,td{color:#222}.lesson-layout{display:block}.assessment-shell{width:100%;margin:0}}
@media(prefers-reduced-motion:reduce){*,*::before,*::after{scroll-behavior:auto!important;transition:none!important}}


/* ============================================================
   Discrete Mathematics visual and print layer
   ============================================================ */
:root{
  --geometry-purple:#4f45a5;
  --geometry-purple-soft:#e4e5fa;
  --geometry-teal:#147e8c;
  --paper:#ffffff;
  --paper-ink:#292333;
}
.geometry-tools{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:17px}
.tool-card{position:relative;overflow:hidden}
.tool-card::before{content:"";position:absolute;inset:0 auto 0 0;width:4px;background:linear-gradient(var(--geometry-purple),var(--geometry-teal))}
.lesson-shell{width:min(calc(100% - 36px),1120px);margin:36px auto 80px}
.lesson-header{padding:28px;border:1px solid var(--line);border-radius:13px;background:var(--panel);box-shadow:var(--shadow)}
.lesson-meta{display:flex;gap:8px;flex-wrap:wrap;margin-top:14px}
.lesson-layout{display:grid;grid-template-columns:minmax(0,1fr) 310px;gap:18px;margin-top:18px;align-items:start}
.lesson-main,.lesson-sidebar{display:grid;gap:18px}
.lesson-sidebar{position:sticky;top:100px}
.visual-card{padding:24px;border:1px solid var(--line);border-radius:13px;background:linear-gradient(145deg,var(--panel),var(--panel2));box-shadow:var(--shadow)}
.visual-card h2,.visual-card h3{margin-top:0}
.lesson-diagram{display:block;width:100%;max-height:320px;margin:16px auto;padding:8px;border:1px solid color-mix(in srgb,var(--geometry-purple) 35%,var(--soft));border-radius:11px;background:#fff;color:#292333}
.formula-strip{display:flex;gap:8px;flex-wrap:wrap}.formula-chip{padding:8px 11px;border:1px solid var(--line);border-radius:9px;color:var(--gold2);background:var(--bg);font-family:ui-monospace,SFMono-Regular,Menlo,monospace}
.worked-example{border-left:4px solid var(--geometry-teal)}
.print-sheet{margin-top:22px;padding:28px;border:1px solid var(--line);border-radius:13px;background:var(--panel);box-shadow:var(--shadow)}
.worksheet-head{display:flex;justify-content:space-between;gap:18px;align-items:flex-start;padding-bottom:14px;border-bottom:2px solid var(--geometry-purple)}
.worksheet-title{margin:0;color:var(--geometry-purple);font:650 1.8rem/1.05 var(--display)}
.name-date{display:grid;grid-template-columns:1fr 1fr;gap:18px;margin:16px 0 8px}
.line-field{display:flex;gap:7px;align-items:end}.line-field span:last-child{flex:1;border-bottom:1px solid currentColor;min-height:20px}
.worksheet-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));border:2px solid var(--geometry-purple);margin-top:18px}
.problem-box{min-height:410px;padding:18px;border-right:1px solid var(--geometry-purple);border-bottom:1px solid var(--geometry-purple);break-inside:avoid;page-break-inside:avoid}
.problem-box:nth-child(2n){border-right:0}.problem-box:nth-last-child(-n+2){border-bottom:0}
.problem-number{display:inline-grid;place-items:center;width:31px;height:31px;border-radius:50%;color:#fff;background:var(--geometry-purple);font-weight:800}
.problem-prompt{min-height:70px;margin:12px 0 0;color:var(--ink);font-weight:650}
.answer-lines{display:grid;gap:15px;margin-top:18px}.answer-lines i{display:block;height:19px;border-bottom:1px solid color-mix(in srgb,var(--muted) 65%,transparent)}
.teacher-answer{padding:12px;border-left:4px solid var(--green);background:color-mix(in srgb,var(--green) 8%,transparent)}
.rubric-table{width:100%;border-collapse:collapse}.rubric-table th,.rubric-table td{padding:10px;border:1px solid var(--soft);vertical-align:top}.rubric-table th{color:var(--gold2);background:var(--panel2)}
.print-only{display:none!important}
@media(max-width:920px){.lesson-layout{grid-template-columns:1fr}.lesson-sidebar{position:static}.geometry-tools,.worksheet-grid{grid-template-columns:1fr}.problem-box,.problem-box:nth-child(2n){border-right:0;border-bottom:1px solid var(--geometry-purple)}.problem-box:last-child{border-bottom:0}}
@media print{
  @page{size:Letter;margin:.48in}
  html,body{background:#fff!important;color:#201a2b!important;font:11pt/1.35 Arial,Helvetica,sans-serif!important}
  body::before,body::after,.site-header,.breadcrumb,.quick-nav,.screen-only,.lesson-sidebar,.footer,.actions,.btn,.button,.toast{display:none!important}
  .print-only{display:block!important}
  .lesson-shell,.wrap{width:auto!important;max-width:none!important;margin:0!important}
  .lesson-header,.lesson-main,.visual-card,.print-sheet,.card{padding:0!important;border:0!important;background:#fff!important;box-shadow:none!important;color:#201a2b!important}
  .lesson-header{margin-bottom:.18in!important}.lesson-header h1{font-size:20pt!important;color:#342d7a!important;margin:0 0 6pt!important}.lesson-header p{margin:3pt 0!important}
  .lesson-layout{display:block!important;margin:0!important}.lesson-main{display:block!important}
  .lesson-main>.visual-card:not(.print-sheet){display:none!important}
  .print-sheet{display:block!important;margin:0!important}
  .worksheet-head{border-bottom:2pt solid #4f45a5!important}.worksheet-title{font-size:19pt!important;color:#4f45a5!important}
  .name-date{font-size:9pt!important;margin:8pt 0!important}
  .worksheet-grid{display:grid!important;grid-template-columns:1fr 1fr!important;border:1.5pt solid #4f45a5!important;margin-top:9pt!important}
  .problem-box{min-height:3.05in!important;padding:10pt!important;border-color:#4f45a5!important;break-inside:avoid!important;page-break-inside:avoid!important}
  .problem-number{width:23px!important;height:23px!important;background:#4f45a5!important;color:#fff!important;font-size:9pt!important;-webkit-print-color-adjust:exact;print-color-adjust:exact}
  .problem-prompt{min-height:38pt!important;margin-top:5pt!important;font-size:9.5pt!important;color:#201a2b!important}
  .lesson-diagram{height:1.55in!important;max-height:1.55in!important;margin:4pt auto!important;padding:2pt!important;border:0!important;background:#fff!important;-webkit-print-color-adjust:exact;print-color-adjust:exact}
  .answer-lines{gap:9pt!important;margin-top:5pt!important}.answer-lines i{height:10pt!important;border-color:#777!important}
  a{color:#201a2b!important;text-decoration:none!important}
  .teacher-key-page .problem-box{min-height:auto!important}.teacher-key-page .answer-lines{display:none!important}
  .teacher-key-page .teacher-answer{display:block!important;color:#201a2b!important;background:#f5f1fb!important;border-left:3pt solid #4f45a5!important;-webkit-print-color-adjust:exact;print-color-adjust:exact}
  .page-break{break-before:page;page-break-before:always}
}

/* Calculus graph clarity */
.graph-note{padding:12px;border:1px dashed var(--line);border-radius:9px;color:var(--muted)}
.ap-practice{border-left:4px solid var(--blue)}
.model-table{width:100%;border-collapse:collapse}.model-table th,.model-table td{padding:9px;border:1px solid var(--soft)}
@media print{.worksheet-subtitle{font-size:9pt!important;color:#333!important}.formula-strip{font-size:8pt!important}}

/* Khaemenes Higher Learning Discrete Mathematics · centered collegiate identity */
:root{
  --gold:#ad8f62;--gold2:#d9c7a6;--blue:#8eb3cf;--geometry-purple:#55688e;--geometry-teal:#2d7f88;
  --radius:21px;
  --display:"Cinzel","Baskerville","Palatino Linotype",Georgia,serif;
  --sans:"Brandon Grotesque","Avenir Next","Segoe UI",Inter,system-ui,sans-serif;
}
body{font-family:var(--sans);letter-spacing:.008em}
h1,h2,h3,.brand-copy strong,.worksheet-title{font-family:var(--display);font-weight:444}
.hero .wrap,.section-head,.lesson-hero .wrap,.lesson-header{text-align:center}
.hero h1{font-family:var(--display);font-weight:444;letter-spacing:.035em;text-transform:uppercase}
.hero .lead{max-width:940px;line-height:1.9}
.section-head{max-width:920px;margin-inline:auto}.section-head h2{font-weight:444;letter-spacing:.02em}
.brand-copy strong{font-weight:444;letter-spacing:.11em}.brand-copy small{letter-spacing:.12em}
.brand-home,.hero-badge{background:linear-gradient(145deg,#edf2f6,#aab6c2);border-color:rgba(217,199,166,.72)}
.college-banner{max-width:980px;margin:24px auto 0;padding:12px 18px;border:1px solid var(--line);border-radius:11px;color:var(--gold2);background:rgba(217,199,166,.06);font-size:.76rem;letter-spacing:.035em}
.course-menu-label{padding:7px 10px 4px;color:var(--gold2);font-size:.67rem;font-weight:800;letter-spacing:.13em;text-transform:uppercase}
.course-menu-divider{height:1px;margin:4px 5px;background:var(--soft)}
.games-menu>summary{border-color:color-mix(in srgb,var(--blue) 48%,var(--soft))}
.activity-menu-panel{width:min(355px,calc(100vw - 28px));max-height:min(72vh,660px);overflow:auto}
.activity-menu-note{margin:5px 10px 8px;color:var(--muted);font-size:.7rem;line-height:1.45}
.games-page{padding:clamp(72px,8vw,108px) 0 112px}.games-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:21px}
.game-card{min-height:290px;display:flex;flex-direction:column;align-items:center;text-align:center;border-top:4px solid var(--accent,var(--blue))}.game-card .btn{margin-top:auto}
.game-mark{width:58px;height:58px;display:grid;place-items:center;margin-bottom:15px;border-radius:13px;color:#07111d;background:linear-gradient(145deg,var(--silver,#edf2f6),var(--accent,#aab6c2));font-family:var(--display);font-weight:444}
.activity-dialog{width:min(1240px,calc(100vw - 28px));height:min(90vh,920px);padding:0;border:1px solid var(--line);border-radius:21px;color:var(--ink);background:var(--panel);box-shadow:0 34px 90px rgba(0,0,0,.68);overflow:hidden}
.activity-dialog::backdrop{background:rgba(2,5,9,.82);backdrop-filter:blur(6px)}.activity-dialog-shell{height:100%;display:grid;grid-template-rows:auto auto minmax(0,1fr)}
.activity-dialog-header{display:flex;align-items:center;justify-content:space-between;gap:18px;padding:15px 17px;border-bottom:1px solid var(--soft);background:linear-gradient(135deg,var(--panel2),var(--bg))}.activity-dialog-header h2{margin:2px 0 0;font-family:var(--display);font-size:1.28rem;font-weight:444}.dialog-eyebrow{margin:0;color:var(--gold2);font-size:.65rem;letter-spacing:.12em;text-transform:uppercase}
.dialog-close{width:42px;height:42px;border:1px solid var(--soft);border-radius:11px;color:var(--ink);background:var(--panel);font-size:1.35rem}.activity-dialog-toolbar{min-height:46px;display:flex;align-items:center;justify-content:space-between;gap:14px;padding:8px 15px;border-bottom:1px solid var(--soft);color:var(--muted);background:var(--bg);font-size:.72rem}.activity-frame{width:100%;height:100%;border:0;background:#fff}
.method-strip{display:grid;grid-template-columns:repeat(4,1fr);gap:12px}.method-step{padding:15px;border:1px solid var(--soft);border-radius:11px;background:var(--bg)}
.proof-note{border-left:4px solid var(--gold);background:color-mix(in srgb,var(--gold) 8%,transparent)}

/* Organized interactive lesson experience, aligned to the Grade 9 portal */
.lesson-page{background:radial-gradient(circle at 50% 0,rgba(217,199,166,.09),transparent 34rem),linear-gradient(145deg,var(--bg2),var(--bg) 52%,var(--bg2))}
.lesson-hero{position:relative;overflow:hidden;padding:clamp(74px,8vw,116px) 0 clamp(58px,7vw,88px);border-bottom:1px solid var(--soft);background:radial-gradient(circle at 50% -20%,rgba(217,199,166,.16),transparent 34rem),radial-gradient(circle at 10% 12%,rgba(142,179,207,.12),transparent 28rem)}
.lesson-hero::before{content:"";position:absolute;left:50%;top:-330px;width:820px;height:820px;transform:translateX(-50%);border:1px solid rgba(255,255,255,.045);border-radius:50%;box-shadow:0 0 0 72px rgba(255,255,255,.014),0 0 0 144px rgba(255,255,255,.009)}
.lesson-hero .wrap{position:relative}.lesson-hero h1{max-width:1080px;margin:14px auto 0;font:444 clamp(2.45rem,5.8vw,5.45rem)/1.02 var(--display);letter-spacing:.018em;text-wrap:balance}
.lesson-hero .lead{max-width:900px;margin:21px auto 0;color:var(--muted);font-size:clamp(1rem,1.55vw,1.14rem);line-height:1.86}
.lesson-hero .actions{justify-content:center;margin-top:30px}
.lesson-shell{width:100%;max-width:none;margin:0;padding:0 0 104px}
.lesson-section{padding:clamp(64px,7vw,96px) 0}.lesson-section.alt{border-block:1px solid var(--soft);background:rgba(255,255,255,.018)}
.lesson-route{display:grid;grid-template-columns:minmax(0,1fr) 330px;gap:21px;align-items:start}
.lesson-main-card,.lesson-record-card{padding:clamp(24px,3vw,36px)}
.lesson-record-card{position:sticky;top:104px}
.objective-list{display:grid;gap:10px;margin:18px 0 0;padding:0;list-style:none}.objective-list li{padding:13px 15px;border:1px solid var(--soft);border-radius:11px;color:var(--muted);background:var(--bg)}.objective-list li::before{content:"✓";margin-right:9px;color:var(--green);font-weight:900}
.lesson-route-list{display:grid;gap:8px;margin:14px 0 0;padding:0;list-style:none;counter-reset:route}.lesson-route-list li{display:grid;grid-template-columns:30px 1fr;gap:9px;align-items:start;color:var(--muted)}.lesson-route-list li::before{counter-increment:route;content:counter(route);width:26px;height:26px;display:grid;place-items:center;border:1px solid var(--line);border-radius:50%;color:var(--gold2);font-size:.72rem}
.lesson-progress{height:9px;overflow:hidden;margin:13px 0;border-radius:999px;background:var(--bg)}.lesson-progress span{display:block;height:100%;width:0;background:linear-gradient(90deg,var(--blue),var(--gold));transition:width .2s}
.lesson-checklist{display:grid;gap:8px;margin-top:14px}.lesson-checklist label{display:flex;align-items:flex-start;gap:9px;padding:9px 10px;border:1px solid var(--soft);border-radius:9px;color:var(--muted);background:var(--bg);font-size:.75rem}.lesson-checklist input{width:auto;min-height:auto;margin-top:3px}
.record-actions{display:grid;gap:8px;margin-top:14px}.record-actions .btn{width:100%}
.lesson-status{min-height:24px;margin:12px 0 0;color:var(--gold2);font-size:.76rem}
.concept-grid-college{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:13px;margin-top:18px}
.concept-step{padding:18px;border:1px solid var(--soft);border-radius:13px;background:var(--bg)}.concept-step strong{display:block;color:var(--gold2);font-family:var(--display);font-weight:444}.concept-step p{margin-bottom:0}
.worked-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:21px}.worked-card{border-top:4px solid var(--geometry-teal)}
.pathway-tabs{display:flex;justify-content:center;gap:8px;flex-wrap:wrap;margin-top:18px}.pathway-tabs button{min-height:42px;padding:8px 14px;border:1px solid var(--line);border-radius:999px;color:var(--muted);background:var(--bg);font-weight:760}.pathway-tabs button[aria-pressed="true"]{color:#101722;background:linear-gradient(135deg,var(--gold),var(--gold2));border-color:transparent}
.pathway-panel{max-width:920px;margin:14px auto 0;padding:22px;border:1px solid var(--line);border-radius:13px;color:var(--muted);background:var(--panel);text-align:left}
.application-card{max-width:1000px;margin-inline:auto;border-left:4px solid var(--blue);text-align:left}
.quick-check-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:17px}.lesson-check-question{padding:22px;border:1px solid var(--soft);border-radius:13px;background:linear-gradient(145deg,var(--panel),var(--panel2))}.lesson-check-question fieldset{border:0;padding:0;margin:0}.lesson-check-question legend{font-family:var(--display);font-weight:444;font-size:1.05rem}.lesson-check-options{display:grid;gap:8px;margin-top:14px}.lesson-check-options label{display:flex;align-items:flex-start;gap:9px;padding:11px;border:1px solid var(--soft);border-radius:9px;color:var(--muted);background:var(--bg)}.lesson-check-options input{width:auto;min-height:auto;margin-top:4px}.lesson-check-feedback{min-height:24px;margin-top:10px;font-size:.78rem}.lesson-check-feedback.good{color:var(--green)}.lesson-check-feedback.bad{color:var(--red)}
.worksheet-section{padding-top:clamp(36px,5vw,72px)}.print-sheet{width:min(calc(100% - 42px),1180px);margin-inline:auto}
.reflection-card{max-width:980px;margin-inline:auto;text-align:left}.reflection-card textarea{min-height:170px}.lesson-nav{display:flex;justify-content:space-between;gap:12px;flex-wrap:wrap;margin-top:22px}.lesson-nav .btn{min-width:180px}
.lesson-jump-nav{position:sticky;top:82px;z-index:850;border-bottom:1px solid var(--soft);background:color-mix(in srgb,var(--bg) 94%,transparent);backdrop-filter:blur(15px)}.lesson-jump-inner{min-height:54px;display:flex;justify-content:center;align-items:center;gap:7px;overflow-x:auto;padding-block:8px}.lesson-jump-inner a{flex:0 0 auto;min-height:36px;display:inline-flex;align-items:center;padding:7px 11px;border:1px solid var(--soft);border-radius:9px;color:var(--muted);font-size:.7rem;text-decoration:none}.lesson-jump-inner a:hover{color:#111927;background:var(--gold2);border-color:transparent}

@media(max-width:1120px){.games-grid{grid-template-columns:repeat(2,1fr)}.method-strip,.concept-grid-college{grid-template-columns:repeat(2,1fr)}}
@media(max-width:920px){.lesson-route{grid-template-columns:1fr}.lesson-record-card{position:static}.worked-grid,.quick-check-grid{grid-template-columns:1fr}.lesson-jump-nav{position:relative;top:auto}}
@media(max-width:700px){.games-grid,.method-strip,.concept-grid-college{grid-template-columns:1fr}.activity-dialog{width:calc(100vw - 14px);height:94vh}.activity-dialog-toolbar{flex-direction:column;align-items:stretch}.lesson-nav .btn{width:100%}.lesson-hero h1{font-size:clamp(2.2rem,12vw,3.65rem)}}
@media print{.activity-dialog,.games-menu,.games-page,.lesson-jump-nav,.lesson-hero,.lesson-section:not(.worksheet-section){display:none!important}.worksheet-section{padding:0!important}.print-sheet{width:auto!important}}

/* Discrete Mathematics-specific visual systems */
.matrix-display{display:grid;grid-template-columns:repeat(var(--cols,2),minmax(34px,1fr));gap:6px;padding:14px;border-inline:3px solid var(--gold);border-radius:9px;background:var(--bg);font-family:ui-monospace,SFMono-Regular,Consolas,monospace}.matrix-cell{display:grid;place-items:center;min-height:34px;border:1px solid var(--soft);border-radius:7px}.vector-arrow{color:var(--blue);font-weight:800}.proof-step{padding:12px;border-left:3px solid var(--gold);border-radius:0 7px 7px 0;background:color-mix(in srgb,var(--gold) 7%,transparent)}.lesson-diagram text{font-family:"Brandon Grotesque","Avenir Next",Arial,sans-serif}.interactive-answer{margin-top:12px}.interactive-answer textarea{min-height:100px}.reveal-box{margin-top:10px;padding:12px;border:1px solid var(--line);border-radius:9px;background:var(--bg)}.quick-check-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:13px}.stage-nav{position:sticky;top:82px;z-index:850;border-block:1px solid var(--soft);background:color-mix(in srgb,var(--bg) 94%,transparent);backdrop-filter:blur(14px)}.stage-nav .wrap{display:flex;justify-content:center;gap:7px;overflow:auto;padding:8px}.stage-nav a{flex:0 0 auto;padding:7px 10px;border:1px solid var(--soft);border-radius:9px;color:var(--muted);font-size:.72rem;text-decoration:none}.stage-nav a:hover{color:#171006;background:var(--gold)}@media(max-width:760px){.quick-check-grid{grid-template-columns:1fr}}

/* Discrete Mathematics visual systems */
.ode-display{padding:15px;border:1px solid var(--line);border-radius:11px;background:var(--bg);font-family:ui-monospace,SFMono-Regular,Consolas,monospace}.rate-arrow{color:var(--blue);font-weight:800}.proof-step{padding:12px;border-left:3px solid var(--gold);border-radius:0 7px 7px 0;background:color-mix(in srgb,var(--gold) 7%,transparent)}.lesson-diagram text{font-family:"Brandon Grotesque","Avenir Next",Arial,sans-serif}.interactive-answer{margin-top:12px}.interactive-answer textarea{min-height:100px}.reveal-box{margin-top:10px;padding:12px;border:1px solid var(--line);border-radius:9px;background:var(--bg)}.quick-check-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:13px}.stage-nav{position:sticky;top:82px;z-index:850;border-block:1px solid var(--soft);background:color-mix(in srgb,var(--bg) 94%,transparent);backdrop-filter:blur(14px)}.stage-nav .wrap{display:flex;justify-content:center;gap:7px;overflow:auto;padding:8px}.stage-nav a{flex:0 0 auto;padding:7px 10px;border:1px solid var(--soft);border-radius:9px;color:var(--muted);font-size:.72rem;text-decoration:none}.stage-nav a:hover{color:#171006;background:var(--gold)}.lab-canvas{width:100%;height:auto;border:1px solid var(--soft);border-radius:11px;background:#fff}.control-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:10px}.range-row{display:grid;grid-template-columns:120px 1fr 72px;gap:8px;align-items:center}@media(max-width:760px){.quick-check-grid,.control-grid{grid-template-columns:1fr}.range-row{grid-template-columns:1fr}}

/* Discrete Mathematics visual systems */
.data-table{width:100%;border-collapse:collapse}.data-table th,.data-table td{border:1px solid var(--line);padding:8px;text-align:right}.data-table th:first-child,.data-table td:first-child{text-align:left}.stat-chip{display:inline-flex;padding:5px 9px;border:1px solid var(--soft);border-radius:999px;background:var(--bg);font-size:.82rem}.chart-note{font-size:.86rem;color:var(--muted)}.lab-output{min-height:220px}.dataset-input{min-height:130px;font-family:ui-monospace,SFMono-Regular,Consolas,monospace}.metric-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:9px}.metric{padding:11px;border:1px solid var(--line);border-radius:9px;background:var(--bg)}@media(max-width:760px){.metric-grid{grid-template-columns:1fr}}

/* Real & Complex Analysis visual systems */
.truth-table{width:100%;border-collapse:collapse}.truth-table th,.truth-table td{border:1px solid var(--line);padding:8px;text-align:center}.logic-chip{display:inline-flex;padding:5px 9px;border:1px solid var(--soft);border-radius:999px;background:var(--bg);font-size:.82rem}.graph-canvas{min-height:360px}.node-label{font:700 14px var(--sans);fill:#17202b}.proof-block{padding:14px;border-left:4px solid var(--gold);background:var(--bg);border-radius:0 9px 9px 0}.lab-output{min-height:220px}.edge-input{min-height:115px;font-family:ui-monospace,SFMono-Regular,Consolas,monospace}.metric-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:9px}.metric{padding:11px;border:1px solid var(--line);border-radius:9px;background:var(--bg)}@media(max-width:760px){.metric-grid{grid-template-columns:1fr}}

/* Advanced proof and analysis additions */
.proof-step{padding:15px;border-left:4px solid var(--gold);border-radius:0 9px 9px 0;background:var(--bg);white-space:pre-wrap}.edge-input{min-height:145px;font-family:ui-monospace,SFMono-Regular,Consolas,monospace}.graph-canvas{width:100%;min-height:350px;border:1px solid var(--soft);border-radius:11px;background:#fff}.lab-output{min-height:180px}.research-note{border-left:4px solid var(--blue)}

/* Khaemenes Academy institutional heading hierarchy · 2026-10-18 */
:where(.hero h1,.lesson-header h1,main#main>.wrap>.section-head>h2,main.section>.wrap>.section-head>h2):not(.khae-academy-heading)::before{content:"Khaemenes Academy";display:block;font:400 clamp(32px,4.4vw,49px)/1.17 "Cinzel",Georgia,serif;letter-spacing:.015em;text-align:center;margin:0 auto 10px;color:inherit;text-transform:none}
:where(.hero h1,.lesson-header h1,main#main>.wrap>.section-head>h2,main.section>.wrap>.section-head>h2):not(.khae-academy-heading){font-size:clamp(19px,2.55vw,27px)!important;font-weight:400!important;line-height:1.35!important;letter-spacing:.015em!important;text-align:center;text-wrap:balance}
.hero h1.khae-academy-heading{font:400 clamp(34px,5.2vw,55px)/1.16 "Cinzel",Georgia,serif!important;letter-spacing:.015em!important;text-align:center;text-wrap:balance;margin:10px auto 0!important}
.hero .khae-course-subtitle{font:400 clamp(20px,2.75vw,28px)/1.35 "Cinzel",Georgia,serif!important;letter-spacing:.025em;text-align:center;text-wrap:balance;margin:10px auto 0;color:inherit;opacity:.87}
@media(max-width:540px){:where(.hero h1,.lesson-header h1,main#main>.wrap>.section-head>h2,main.section>.wrap>.section-head>h2):not(.khae-academy-heading)::before{font-size:clamp(28px,8vw,35px)}.hero h1.khae-academy-heading{font-size:clamp(31px,8vw,40px)!important}}
@media print{:where(.hero h1,.lesson-header h1,main#main>.wrap>.section-head>h2,main.section>.wrap>.section-head>h2):not(.khae-academy-heading)::before{font-size:18pt!important;color:#111!important;margin-bottom:5pt!important}:where(.hero h1,.lesson-header h1,main#main>.wrap>.section-head>h2,main.section>.wrap>.section-head>h2):not(.khae-academy-heading){font-size:14pt!important}.hero h1.khae-academy-heading{font-size:19pt!important}.hero .khae-course-subtitle{font-size:14pt!important}}