:root{--ink:#182338;--muted:#5c6b80;--line:#dbe2ea;--paper:#f4f7fb;--white:#fff;--navy:#111927;--blue:#215ff3;--blue-soft:#edf2ff;--mint:#d9f5e9;--green:#08734d;--rose:#fff0ef;--red:#bd3b34;--shadow:0 20px 48px rgba(22,39,67,.08)}
.course-detail{padding:36px 0 96px}.course-detail[hidden],.periodic-reference[hidden]{display:none}.course-detail .detail-hero{margin-bottom:48px}.question-layout:has(.periodic-reference:not([hidden])){display:grid;grid-template-columns:minmax(0,1fr) 400px;gap:24px;align-items:start}.periodic-reference{position:sticky;top:20px;margin-top:34px;padding:16px;background:#f8faff;border:1px solid var(--line);border-radius:14px}.periodic-reference h3{font-size:17px;margin:0 0 3px}.periodic-reference p{font-size:11px;color:var(--muted);margin:0 0 12px}.table-scroll{overflow-x:auto}.periodic-grid{display:grid;grid-template-columns:repeat(18,minmax(19px,1fr));gap:2px;min-width:365px}.table-group{font-size:9px;text-align:center;color:#65799a}.element{min-height:25px;display:grid;place-items:center;background:#e4edff;border:1px solid #bfd0f4;border-radius:3px;color:#173e91;font-size:10px;font-weight:800}.element.empty{background:transparent;border-color:transparent}@media(max-width:950px){.question-layout:has(.periodic-reference:not([hidden])){grid-template-columns:1fr}.periodic-reference{position:static;margin-top:0;margin-bottom:24px;max-width:480px}.periodic-grid{grid-template-columns:repeat(18,20px)}}
.history-block{margin-top:56px}.attempt-list{display:grid;gap:12px}.attempt-card{display:flex;justify-content:space-between;align-items:center;gap:18px;background:#fff;border:1px solid var(--line);border-radius:14px;padding:18px 22px}.attempt-card h3{font-size:17px;margin:2px 0}.attempt-card p,.empty-history{font-size:13px;color:var(--muted);margin:0}.attempt-number{font-size:11px;font-weight:800;letter-spacing:.12em;text-transform:uppercase;color:#526e9b}.finish-row{border-top:1px solid var(--line);padding-top:20px;margin-top:20px;display:flex;justify-content:flex-end}.finish-row[hidden]{display:none}@media(max-width:580px){.attempt-card{align-items:flex-start;flex-direction:column}.attempt-card .button{width:100%}}
.review-summary{margin-top:24px;padding:16px 18px;background:#f3f7ff;border:1px solid #cbdafa;border-radius:12px;font-size:14px}.review-summary[hidden]{display:none}.review-summary p{margin:6px 0 0}.missed-link{border:1px solid #a7bdf4;background:#fff;border-radius:6px;color:#254caa;font-weight:800;padding:3px 7px;margin:2px}.missed-link:hover{background:#e7eeff}
.unit-detail{padding:36px 0 96px}.unit-detail[hidden],.quiz-footer[hidden],.score-pill[hidden]{display:none}.detail-hero{margin:22px 0 62px;padding:48px 52px;background:#182642;color:#fff;border-radius:24px;position:relative;overflow:hidden}.detail-hero:after{content:'∴';position:absolute;right:35px;top:-85px;font-size:350px;line-height:1;color:rgba(255,255,255,.06);pointer-events:none}.detail-hero .eyebrow{color:#abc6ff}.detail-hero h1{font-size:clamp(36px,5vw,64px);line-height:1.05;letter-spacing:-.06em;margin:18px 0}.detail-hero p{max-width:650px;color:#c7d4ea;font-size:17px;margin:0}.detail-actions{display:flex;align-items:center;flex-wrap:wrap;gap:20px;margin-top:30px}.detail-actions span{font-size:13px;color:#b8cbe7}.card-title{margin:24px 0 8px;padding:0;border:0;background:none;text-align:left;color:var(--ink);font-size:22px;line-height:1.18;letter-spacing:-.04em;font-weight:800}.card-title:hover{color:var(--blue)}.topic-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:16px}.topic-card{background:#fff;border:1px solid var(--line);border-radius:16px;padding:23px;box-shadow:var(--shadow)}.topic-card>span,.written-review-head span{font-size:11px;color:#60799e;letter-spacing:.14em;font-weight:800}.topic-card h3{font-size:20px;letter-spacing:-.035em;margin:12px 0 6px}.topic-card p{color:var(--muted);font-size:14px;margin:0;min-height:42px}.topic-card button{border:0;background:none;color:var(--blue);font-weight:800;padding:0;margin-top:18px}.topic-card button:hover{text-decoration:underline}.option.selected{border-color:#7198ff;background:#edf2ff;box-shadow:inset 0 0 0 1px #7198ff}.option.selected .letter{background:var(--blue);color:#fff}.result-heading{display:flex;justify-content:space-between;align-items:center;gap:20px}.result-heading h3{font-size:clamp(28px,4vw,42px);line-height:1.1;letter-spacing:-.05em;margin:10px 0}.result-heading p{color:var(--muted);margin:0}.review-summary{background:#edf2ff;border-color:#c7d6fa;padding:24px}.result-section{border-top:1px solid var(--line);padding:30px 0}.result-section:first-child{border-top:0;padding-top:0}.result-section>h3{font-size:24px;letter-spacing:-.04em;margin:0 0 5px}.result-section>p{font-size:14px;color:var(--muted);margin:0 0 18px}.answer-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:8px;max-width:780px}.answer-chip{border:1px solid var(--line);border-radius:8px;padding:8px;background:#fff;font-size:12px;font-weight:800}.answer-chip.right{color:#08734d;border-color:#9ed9bc;background:#edfaf3}.answer-chip.wrong{color:#b13832;border-color:#eeb2ae;background:#fff3f2}.answer-chip:hover{filter:brightness(.95)}.written-review{padding:24px 0;border-bottom:1px solid var(--line)}.written-review:last-child{border-bottom:0}.written-review-head h4{font-size:21px;letter-spacing:-.035em;margin:3px 0 8px}.review-prompt{font-size:14px;color:var(--muted);max-width:820px}.your-answer{margin:18px 0;padding:16px;background:#f8fafc;border-radius:10px;max-width:830px}.your-answer strong{font-size:13px}.your-answer p{white-space:pre-wrap;margin:8px 0 0}.slide-answer{max-width:830px;margin:22px 0;background:#f3f7ff;border:1px solid #cbdafa;border-radius:12px;padding:20px}.slide-answer h4{margin:0 0 12px;font-size:16px}.slide-answer p{font-size:14px;margin:9px 0;padding-left:14px;border-left:2px solid #b2c8fa}.rubric{font-size:13px;color:#486390;margin-top:16px}.mark-actions{display:flex;align-items:center;gap:12px;flex-wrap:wrap}.mark-actions label{font-size:13px;font-weight:800}.mark-actions select{border:1px solid #cdd7e4;border-radius:8px;background:#fff;padding:9px 12px;font:inherit}.question-stage:has(.result-section){padding-bottom:0}.quiz-shell:has(.result-section) .question-stage{padding-top:24px}@media(max-width:760px){.topic-grid{grid-template-columns:1fr}.detail-hero{padding:34px 27px}.result-heading{align-items:flex-start;flex-direction:column}.answer-grid{grid-template-columns:repeat(3,1fr)}}@media(max-width:480px){.answer-grid{grid-template-columns:repeat(2,1fr)}.detail-actions .button{width:100%}}
.test-detail{padding:36px 0 96px}.test-detail[hidden]{display:none}.test-menu-hero{margin-bottom:38px}.test-detail .history-block{margin-top:0}.topic-heading{margin-top:58px}.topic-card{display:flex;flex-direction:column}.topic-card button{align-self:flex-start}.topic-card p{flex:1}.unit-detail .detail-hero{margin-bottom:48px}.test-menu-hero .button{position:relative;z-index:1}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--paper);color:var(--ink);font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;line-height:1.5}button,textarea{font:inherit}button{cursor:pointer}button:disabled{cursor:not-allowed;opacity:.55}a{color:inherit}.skip-link{position:absolute;top:-60px;left:12px;z-index:10;background:#fff;padding:10px}.skip-link:focus{top:12px}.site-header{background:var(--navy);color:#fff}.header-inner{max-width:1120px;margin:auto;min-height:76px;padding:0 28px;display:flex;justify-content:space-between;align-items:center}.brand{display:flex;gap:11px;align-items:center;font-size:21px;text-decoration:none;letter-spacing:-.04em}.brand strong{font-weight:800}.brand-mark{display:grid;place-items:center;background:#a8c7ff;color:#0c2259;border-radius:10px;width:34px;height:34px;font-size:25px;line-height:1}.header-actions{display:flex;align-items:center;gap:20px}.ideas-link{font-size:12px;color:#fff;text-decoration:none;border:1px solid rgba(190,208,235,.55);border-radius:999px;padding:7px 11px;font-weight:700}.ideas-link span{color:#bed0eb}.ideas-link:hover{background:rgba(255,255,255,.1)}.header-tag{font-size:11px;letter-spacing:.17em;color:#bed0eb;font-weight:800}.container{max-width:1120px;margin:auto;padding:0 28px}.hero{padding:92px 0 88px;border-bottom:1px solid var(--line);max-width:820px}.eyebrow{display:flex;align-items:center;gap:8px;color:#486390;font-size:11px;letter-spacing:.17em;font-weight:800}.eyebrow-dot{width:7px;height:7px;border-radius:50%;background:#4f89ff}.hero h1{font-size:clamp(48px,7vw,88px);letter-spacing:-.075em;line-height:1.02;margin:20px 0 24px;font-weight:800}.hero h1 em{font-style:normal;color:var(--blue)}.hero>p:not(.hero-note){font-size:19px;max-width:610px;color:var(--muted);line-height:1.65}.hero-actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:28px}.button{display:inline-flex;align-items:center;justify-content:center;gap:7px;text-decoration:none;border-radius:11px;padding:12px 18px;border:1px solid transparent;font-weight:700;transition:transform .18s,background .18s}.button:hover:not(:disabled){transform:translateY(-1px)}.button-primary{background:var(--blue);color:#fff}.button-primary:hover:not(:disabled){background:#174bd0}.button-secondary{background:#fff;color:var(--ink);border-color:var(--line)}.button-secondary:hover:not(:disabled){background:#eef3f9}.hero-note{font-size:13px;color:var(--muted);margin:18px 0 0}.library{padding:68px 0 92px}.section-heading{display:flex;align-items:end;justify-content:space-between;gap:16px;margin-bottom:28px}.section-heading h2,.quiz-head h2{font-size:clamp(28px,4vw,40px);line-height:1.1;letter-spacing:-.055em;margin:10px 0 0}.collection-count{font-size:13px;color:var(--muted);font-weight:700}.library-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:18px}.test-card{display:flex;flex-direction:column;background:var(--white);border:1px solid var(--line);border-radius:18px;padding:25px;box-shadow:var(--shadow);min-height:270px}.card-top{display:flex;align-items:center;justify-content:space-between;gap:8px}.card-icon{display:grid;place-items:center;width:40px;height:40px;background:var(--blue-soft);color:var(--blue);border-radius:12px;font-size:19px}.card-type{font-size:11px;letter-spacing:.09em;font-weight:800;color:#526e9b;text-transform:uppercase}.test-card h3{font-size:22px;line-height:1.18;letter-spacing:-.04em;margin:24px 0 8px}.test-card p{font-size:14px;color:var(--muted);margin:0}.card-bottom{display:flex;align-items:center;justify-content:space-between;gap:8px;margin-top:auto;padding-top:24px}.card-meta{font-size:12px;color:var(--muted)}.card-start{border:0;background:transparent;color:var(--blue);font-weight:800;padding:5px 0}.card-start:hover{text-decoration:underline}.quiz-shell{background:#fff;border:1px solid var(--line);border-radius:20px;box-shadow:var(--shadow);margin:48px 0 90px;padding:32px}.quiz-shell[hidden],.hero[hidden],.library[hidden]{display:none}.quiz-top,.quiz-head,.quiz-footer{display:flex;align-items:center;justify-content:space-between;gap:16px}.text-button{border:0;background:none;color:var(--blue);padding:4px 0;font-weight:700}.text-button:hover{text-decoration:underline}.quiz-type{font-size:11px;color:#526e9b;letter-spacing:.12em;text-transform:uppercase;font-weight:800}.quiz-head{margin:28px 0}.score-pill{white-space:nowrap;background:var(--blue-soft);color:#254caa;border-radius:100px;padding:9px 14px;font-size:13px;font-weight:800}.progress-line{height:8px;background:#e8edf5;border-radius:100px;overflow:hidden}.progress-line>div{height:100%;background:var(--blue);width:0;transition:width .2s}.question-stage{min-height:370px;padding:36px 0}.question-kicker{font-size:12px;font-weight:800;letter-spacing:.13em;color:#60799e;text-transform:uppercase}.question-stage h3{font-size:clamp(22px,3vw,30px);line-height:1.3;letter-spacing:-.035em;margin:10px 0 26px;max-width:800px}.options{display:grid;gap:10px;max-width:830px}.option{width:100%;text-align:left;border:1px solid var(--line);background:#fff;border-radius:11px;padding:14px 16px;display:flex;align-items:flex-start;gap:14px;color:var(--ink)}.option:hover:not(:disabled){border-color:#85a7f9;background:#f8faff}.option:disabled{opacity:1;cursor:default}.option .letter{flex:none;display:grid;place-items:center;width:26px;height:26px;border-radius:7px;background:#edf2f9;font-size:12px;font-weight:800}.option.correct{border-color:#8fd9b7;background:var(--mint)}.option.incorrect{border-color:#efa8a2;background:var(--rose)}.feedback{max-width:830px;margin-top:18px;padding:15px 17px;border-radius:11px;background:var(--blue-soft);font-size:14px}.feedback strong{display:block;margin-bottom:3px}.feedback.correct{background:var(--mint);color:#075f40}.feedback.incorrect{background:var(--rose);color:#8d302b}.written-prompt{max-width:820px;color:var(--muted);margin:-8px 0 24px}.answer-label{display:block;font-size:13px;font-weight:800;margin-bottom:9px}.answer-box{display:block;width:100%;max-width:830px;min-height:180px;resize:vertical;border:1px solid #cdd7e4;border-radius:11px;padding:14px;color:var(--ink);background:#fff;font-size:16px;line-height:1.55}.answer-box:focus{outline:3px solid #bfd1ff;border-color:var(--blue)}.written-actions{display:flex;align-items:center;gap:12px;flex-wrap:wrap;margin-top:14px}.hint{font-size:13px;color:var(--muted)}.ai-feedback{max-width:830px;margin-top:22px;background:#f3f7ff;border:1px solid #cbdafa;border-radius:13px;padding:19px}.ai-feedback h4{font-size:17px;margin:0 0 10px}.ai-feedback p{margin:8px 0}.ai-feedback ul{margin:8px 0;padding-left:20px}.quiz-footer{border-top:1px solid var(--line);padding-top:24px}.quiz-footer>span{font-size:13px;color:var(--muted)}.site-footer{border-top:1px solid var(--line);color:var(--muted);font-size:13px;padding:25px 0 35px}.site-footer span{margin:0 5px}.toast{position:fixed;right:20px;bottom:20px;background:#17253e;color:white;border-radius:10px;padding:11px 15px;font-size:13px;box-shadow:var(--shadow);opacity:0;pointer-events:none;transition:opacity .2s}.toast.show{opacity:1}@media(max-width:850px){.library-grid{grid-template-columns:repeat(2,minmax(0,1fr))}}@media(max-width:580px){.container{padding:0 18px}.header-inner{padding:0 18px;min-height:66px}.header-actions{gap:10px}.ideas-link{font-size:10px;padding:6px 8px}.ideas-link span{display:none}.header-tag{font-size:9px}.hero{padding:64px 0 60px}.hero>p:not(.hero-note){font-size:17px}.library{padding:48px 0 64px}.library-grid{grid-template-columns:1fr}.test-card{min-height:240px}.quiz-shell{padding:20px;margin:24px 0 60px}.quiz-head{align-items:flex-start;flex-direction:column}.question-stage{padding:28px 0}.quiz-footer{gap:8px}.quiz-footer .button{padding:10px 12px}.score-pill{font-size:12px}}@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*{transition:none!important}}
/* Unit 2 diagrams keep handwritten work and worked answers readable on phones. */
.source-note{font-size:.78rem;color:#67788b;margin-top:1rem;line-height:1.5}
.orbital-answer{white-space:pre-wrap;overflow-wrap:anywhere;background:#fff;border:1px solid #d8e2ea;border-radius:12px;padding:18px;font-size:.94rem;line-height:1.9;color:#172234}
.molecule-figure{margin:24px 0;padding:16px;background:#f8fafb;border:1px solid #dce5ec;border-radius:16px;text-align:center;color:#172234}
.molecule-figure svg{display:block;width:min(100%,420px);margin:auto;font:22px sans-serif}
.molecule-figure figcaption{font-size:.85rem;color:#52657a;line-height:1.6}
.lewis-model{padding:12px;color:#172234;background:#fff;border-radius:12px;margin-top:16px}
.lewis-model svg{width:min(100%,340px);font:22px sans-serif;display:block;margin:auto}
.resonance-model{display:flex;align-items:center;gap:5px}
.resonance-model svg{width:30%;min-width:0}
.lewis-model p{font-size:.85rem}
.drawing-area{margin:24px 0;border:1px solid #cedbe5;border-radius:14px;overflow:hidden;background:#f5f8fa}
.drawing-tools{display:flex;align-items:center;gap:12px;padding:12px;flex-wrap:wrap}
.drawing-tools strong{margin-right:auto;font-size:.9rem}
.drawing-tools button{border:1px solid #c8d5df;border-radius:8px;background:white;padding:8px 12px;cursor:pointer;color:#172234}
#diagram-pad{width:100%;height:auto;display:block;background:#fff;touch-action:none;cursor:crosshair}
.drawing-area .hint{padding:0 14px 10px}
.diagram-option{display:block;margin:-16px 0 35px;padding:15px 18px;border:1px solid #c9d8ec;background:#f3f7ff;border-radius:12px;font-size:14px;color:#253c61}
.diagram-option[hidden]{display:none}
.diagram-option input{margin-right:9px;width:17px;height:17px;vertical-align:middle;accent-color:#215ff3}
.orbital-picture{background:#fff;padding:12px;border-radius:10px;margin:8px 0}
.orbital-picture strong{font-size:13px}
.orbital-picture svg,.orbital-model>svg{display:block;width:100%;color:#172234;max-width:700px}
.saved-drawing{display:block;width:100%;background:#fff;color:#172234;border:1px solid #d8e2ea;border-radius:12px;margin:12px 0}
.element{min-height:32px;row-gap:0;padding:2px 0}
.element small{font-size:8px;line-height:1;color:#63748a}
@media(max-width:600px){.resonance-model{flex-wrap:wrap}.resonance-model svg{width:100%}.resonance-model span{width:100%;text-align:center}}
@media(max-width:430px){.header-tag{display:none}.brand{white-space:nowrap}.header-actions{margin-left:12px}.section-heading{align-items:flex-start;flex-direction:column}}

/* Test references */
.unit-detail .section-heading[hidden],.unit-detail .topic-grid[hidden]{display:none!important}
#study-tools[hidden],#study-tools [hidden]{display:none!important}
.quiz-top{gap:12px;flex-wrap:wrap}
#study-tools{margin-left:auto}
.toolbox-launchers{position:relative}
.toolbox-launchers .button{padding:9px 14px;font-size:13px;min-height:40px}
.mobile-table-button{display:none}
.mobile-calculator-button{display:none}
.toolbox-menu{position:absolute;right:0;top:calc(100% + 7px);min-width:185px;padding:6px;background:#fff;border:1px solid #d6e0e9;border-radius:12px;box-shadow:0 12px 36px #152c4426;z-index:90}
.toolbox-menu button{display:block;width:100%;padding:12px;border:0;background:transparent;text-align:left;font:inherit;color:#172234;border-radius:7px;cursor:pointer}
.toolbox-menu button:hover,.toolbox-menu button[aria-pressed=true]{background:#edf3ff;color:#215ff3}
.tool-panel{position:fixed;left:calc(100vw - 475px);top:145px;width:450px;max-width:calc(100vw - 24px);max-height:calc(100dvh - 24px);overflow:auto;border:1px solid #c6d4e2;border-radius:16px;background:#fff;box-shadow:0 18px 65px #14233b33;color:#172234;z-index:60}
.tool-panel-header{display:flex;align-items:center;justify-content:space-between;gap:12px;padding:11px 15px;border-bottom:1px solid #e2e9ef;background:#f5f8fc;cursor:grab;touch-action:none;user-select:none;position:sticky;top:0;z-index:2}
.tool-panel-header h3{margin:0;font-size:15px;letter-spacing:0}
.table-rows-label{margin-left:auto;font-size:11px;color:#526780;display:flex;align-items:center;gap:5px}
.table-rows-label select{padding:5px 3px;border:1px solid #cad6e3;border-radius:6px;background:#fff;font:inherit;color:#172234;max-width:95px}
.tool-panel-header button{width:34px;height:34px;font-size:24px;line-height:1;border:0;border-radius:8px;background:transparent;color:#46576a;cursor:pointer}
.tool-panel-header button:hover{background:#e5edf6}
.tool-panel-body{padding:14px}
.reference-scroll{overflow-x:auto;padding:2px}
.reference-grid{display:grid;grid-template-columns:repeat(18,minmax(0,1fr));gap:2px;min-width:390px}
.reference-group{text-align:center;font-size:10px;color:#53667c;padding-bottom:4px}
.reference-element{min-width:0;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:2px;padding:3px 0;min-height:32px;border:1px solid #bac7d4;border-radius:3px;background:#fff;color:#172234;cursor:pointer}
.reference-element small{font-size:8px;line-height:1}.reference-element strong{font-size:12px;line-height:1.2}
.reference-element:hover,.reference-element.selected{background:#e8f0ff;border-color:#215ff3;box-shadow:inset 0 0 0 1px #215ff3}
.reference-red strong{color:#a5283f}
.reference-gap{font-size:8px;text-align:center;align-self:center;color:#68798c}
.element-detail{padding:12px;background:#f4f7fc;border-radius:10px;min-height:99px}
.element-back{display:block;border:0;background:transparent;padding:0;margin-bottom:16px;color:#215ff3;font:inherit;font-size:12px;cursor:pointer}
.element-detail>p{margin:12px 0;font-size:13px;color:#53667c}
.element-title{display:flex;align-items:center;gap:10px;font-size:14px}.element-title strong{font-size:25px;color:#215ff3}
.element-detail dl{display:grid;grid-template-columns:repeat(3,1fr);gap:8px;margin:10px 0 0}.element-detail dt{font-size:10px;color:#586d82}.element-detail dd{margin:3px 0 0;font-weight:650;font-size:15px}
.reference-note{margin:10px 0 0;font-size:10px;line-height:1.5;color:#68798c}
.calculator-panel{width:290px;left:calc(100vw - 320px);top:200px}
.tool-panel{box-sizing:border-box}
.calculator-settings{display:flex;gap:10px;justify-content:space-between;margin-bottom:12px}.calculator-settings label{font-size:11px;display:grid;gap:4px;color:#526780}.calculator-settings select{font:inherit;color:#172234;padding:6px;border:1px solid #cad6e3;border-radius:6px;background:#fff}
#calculator-input{width:100%;box-sizing:border-box;padding:12px;border:1px solid #becddd;border-radius:8px;font-size:20px;text-align:right;color:#172234;background:white}
#calculator-result{display:block;padding:8px 2px 12px;text-align:right;overflow-wrap:anywhere;min-height:34px;font-size:17px;color:#215ff3}
.calculator-keys{display:grid;grid-template-columns:repeat(4,1fr);gap:5px}.scientific-keys{display:grid;grid-template-columns:repeat(5,1fr);gap:4px;margin-bottom:8px}
.calculator-keys button,.scientific-keys button{border:1px solid #d4dee9;background:#f5f8fc;border-radius:7px;min-height:40px;font:inherit;font-size:15px;color:#172234;cursor:pointer}.scientific-keys button{font-size:12px;min-height:30px}.calculator-keys button:hover,.scientific-keys button:hover{background:#e5edfa}.calculator-keys .calculator-equal{background:#215ff3;color:#fff;border-color:#215ff3}
.table-backdrop{display:none}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}
.empty-course{grid-column:1/-1;padding:30px;border:1px solid #d6e0e9;border-radius:16px;background:#fff}.empty-course h3{margin:0 0 8px}.empty-course p{margin:0;color:#526780}
.probability-keys{display:none}.probability-tools .probability-keys:not([hidden]){display:flex;gap:6px;margin:0 0 8px}.probability-keys button{flex:1;padding:9px 4px;border:1px solid #cad6e3;border-radius:7px;background:#edf3ff;color:#172234;font:inherit;font-size:12px;cursor:pointer}
@media(max-width:760px){
 .probability-tools .mobile-calculator-button{display:inline-flex}
 .probability-tools .calculator-panel:not([hidden]){display:block!important;left:12px!important;top:50%!important;transform:translateY(-50%);width:calc(100vw - 24px);max-width:390px;max-height:calc(100dvh - 32px);z-index:100!important}
 .probability-tools .calculator-panel .tool-panel-header{cursor:default;touch-action:auto}
 .desktop-toolbox-button,.toolbox-menu,.calculator-panel,.table-rows-label{display:none!important}.mobile-table-button{display:inline-flex}
 .quiz-top{align-items:center}.quiz-type{display:none}
 .table-panel{left:12px!important;top:50%!important;transform:translateY(-50%);width:calc(100vw - 24px);max-width:none;max-height:calc(100dvh - 32px);z-index:100!important;box-sizing:border-box}
 .table-panel .tool-panel-header{cursor:default;touch-action:auto}.tool-panel-body{padding:10px}.reference-grid{min-width:324px}.reference-element strong{font-size:11px}
 .reference-modal-open{overflow:hidden}.reference-modal-open .table-backdrop{display:block;position:fixed;inset:0;background:#1119279c;z-index:99}
 .element-detail dl{gap:5px}.element-detail dt{font-size:10px}.element-detail dd{font-size:14px}
}

.math-graph{margin:20px 0;max-width:760px}.math-graph svg{display:block;width:100%;height:auto;border:1px solid #dce3e8;border-radius:8px}.math-graph figcaption{font-size:.8rem;color:#5c6573;margin-top:7px}.entry-answer{min-height:0!important;height:54px;width:100%;font-size:1.1rem}.written-prompt,.review-prompt,.slide-answer p{white-space:pre-wrap;overflow-wrap:anywhere}.numeric-feedback{padding:12px;border-radius:8px;background:#edf5f2}.question-stage h3{overflow-wrap:anywhere}

@media(max-width:760px){.math-graph{overflow-x:auto}.math-graph svg{min-width:600px}.math-drawing{overflow-x:auto}.math-drawing canvas{min-width:600px}.math-drawing .drawing-tools{min-width:300px}}