/*! tailwindcss v4.3.3 | MIT License | https://tailwindcss.com */@layer properties{@supports (((-webkit-hyphens:none)) and (not (margin-trim:inline))) or ((-moz-orient:inline) and (not (color:rgb(from red r g b)))){*,::backdrop,:after,:before{--tw-rotate-x:initial;--tw-rotate-y:initial;--tw-rotate-z:initial;--tw-skew-x:initial;--tw-skew-y:initial;--tw-border-style:solid;--tw-shadow:0 0 #0000;--tw-shadow-color:initial;--tw-shadow-alpha:100%;--tw-inset-shadow:0 0 #0000;--tw-inset-shadow-color:initial;--tw-inset-shadow-alpha:100%;--tw-ring-color:initial;--tw-ring-shadow:0 0 #0000;--tw-inset-ring-color:initial;--tw-inset-ring-shadow:0 0 #0000;--tw-ring-inset:initial;--tw-ring-offset-width:0px;--tw-ring-offset-color:#fff;--tw-ring-offset-shadow:0 0 #0000;--tw-outline-style:solid;--tw-blur:initial;--tw-brightness:initial;--tw-contrast:initial;--tw-grayscale:initial;--tw-hue-rotate:initial;--tw-invert:initial;--tw-opacity:initial;--tw-saturate:initial;--tw-sepia:initial;--tw-drop-shadow:initial;--tw-drop-shadow-color:initial;--tw-drop-shadow-alpha:100%;--tw-drop-shadow-size:initial}}}@layer theme{:host,:root{--font-mono:ui-monospace,"SFMono-Regular",Consolas,monospace;--default-transition-duration:.15s;--default-transition-timing-function:cubic-bezier(.4,0,.2,1);--default-font-family:"Segoe UI",system-ui,-apple-system,sans-serif;--default-mono-font-family:ui-monospace,"SFMono-Regular",Consolas,monospace}}@layer base{*,::backdrop,:after,:before{box-sizing:border-box;border:0 solid;margin:0;padding:0}::file-selector-button{box-sizing:border-box;border:0 solid;margin:0;padding:0}:host,html{-webkit-text-size-adjust:100%;tab-size:4;line-height:1.5;font-family:var(--default-font-family,-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue","Noto Sans",Arial,sans-serif,"Apple Color Emoji","Segoe UI Emoji","Segoe UI Symbol","Noto Color Emoji");font-feature-settings:var(--default-font-feature-settings,normal);font-variation-settings:var(--default-font-variation-settings,normal);-webkit-tap-highlight-color:transparent}hr{height:0;color:inherit;border-top-width:1px}abbr:where([title]){-webkit-text-decoration:underline dotted;text-decoration:underline dotted}h1,h2,h3,h4,h5,h6{font-size:inherit;font-weight:inherit}a{color:inherit;-webkit-text-decoration:inherit;text-decoration:inherit}b,strong{font-weight:bolder}code,kbd,pre,samp{font-family:var(--default-mono-font-family,ui-monospace,SFMono-Regular,Menlo,Monaco,Consolas,"Liberation Mono","Courier New",monospace);font-feature-settings:var(--default-mono-font-feature-settings,normal);font-variation-settings:var(--default-mono-font-variation-settings,normal);font-size:1em}small{font-size:80%}sub,sup{vertical-align:baseline;font-size:75%;line-height:0;position:relative}sub{bottom:-.25em}sup{top:-.5em}table{text-indent:0;border-color:inherit;border-collapse:collapse}:-moz-focusring:where(:not(iframe)){outline:auto}progress{vertical-align:baseline}summary{display:list-item}menu,ol,ul{list-style:none}audio,canvas,embed,iframe,img,object,svg,video{vertical-align:middle;display:block}img,video{max-width:100%;height:auto}button,input,optgroup,select,textarea{font:inherit;font-feature-settings:inherit;font-variation-settings:inherit;letter-spacing:inherit;color:inherit;opacity:1;background-color:#0000;border-radius:0}::file-selector-button{font:inherit;font-feature-settings:inherit;font-variation-settings:inherit;letter-spacing:inherit;color:inherit;opacity:1;background-color:#0000;border-radius:0}:where(select:is([multiple],[size])) optgroup{font-weight:bolder}:where(select:is([multiple],[size])) optgroup option{padding-inline-start:20px}::file-selector-button{margin-inline-end:4px}::placeholder{opacity:1}@supports (not ((-webkit-appearance:-apple-pay-button))) or (contain-intrinsic-size:1px){::placeholder{color:currentColor}@supports (color:color-mix(in lab,red,red)){::placeholder{color:color-mix(in oklab,currentcolor 50%,transparent)}}}textarea{resize:vertical}::-webkit-search-decoration{-webkit-appearance:none}::-webkit-date-and-time-value{min-height:1lh;text-align:inherit}::-webkit-datetime-edit{display:inline-flex}::-webkit-datetime-edit-fields-wrapper{padding:0}::-webkit-datetime-edit,::-webkit-datetime-edit-year-field{padding-block:0}::-webkit-datetime-edit-day-field,::-webkit-datetime-edit-month-field{padding-block:0}::-webkit-datetime-edit-hour-field,::-webkit-datetime-edit-minute-field{padding-block:0}::-webkit-datetime-edit-millisecond-field,::-webkit-datetime-edit-second-field{padding-block:0}::-webkit-datetime-edit-meridiem-field{padding-block:0}::-webkit-calendar-picker-indicator{line-height:1}:-moz-ui-invalid{box-shadow:none}button,input:where([type=button],[type=reset],[type=submit]){appearance:button}::file-selector-button{appearance:button}::-webkit-inner-spin-button,::-webkit-outer-spin-button{height:auto}[hidden]:where(:not([hidden=until-found])){display:none!important}}@layer components;@layer utilities{.collapse{visibility:collapse}.invisible{visibility:hidden}.visible{visibility:visible}.absolute{position:absolute}.fixed{position:fixed}.relative{position:relative}.static{position:static}.sticky{position:sticky}.isolate{isolation:isolate}.container{width:100%}@media (min-width:40rem){.container{max-width:40rem}}@media (min-width:48rem){.container{max-width:48rem}}@media (min-width:64rem){.container{max-width:64rem}}@media (min-width:80rem){.container{max-width:80rem}}@media (min-width:96rem){.container{max-width:96rem}}.block{display:block}.contents{display:contents}.flex{display:flex}.grid{display:grid}.hidden{display:none}.inline{display:inline}.inline-block{display:inline-block}.table{display:table}.h-full{height:100%}.min-h-full{min-height:100%}.shrink{flex-shrink:1}.grow{flex-grow:1}.transform{transform:var(--tw-rotate-x,) var(--tw-rotate-y,) var(--tw-rotate-z,) var(--tw-skew-x,) var(--tw-skew-y,)}.flex-col{flex-direction:column}.rounded{border-radius:.25rem}.border{border-style:var(--tw-border-style);border-width:1px}.italic{font-style:italic}.antialiased{-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}.shadow{--tw-shadow:0 1px 3px 0 var(--tw-shadow-color,#0000001a),0 1px 2px -1px var(--tw-shadow-color,#0000001a)}.ring,.shadow{box-shadow:var(--tw-inset-shadow),var(--tw-inset-ring-shadow),var(--tw-ring-offset-shadow),var(--tw-ring-shadow),var(--tw-shadow)}.ring{--tw-ring-shadow:var(--tw-ring-inset,) 0 0 0 calc(1px + var(--tw-ring-offset-width)) var(--tw-ring-color,currentcolor)}.outline{outline-style:var(--tw-outline-style);outline-width:1px}.filter{filter:var(--tw-blur,) var(--tw-brightness,) var(--tw-contrast,) var(--tw-grayscale,) var(--tw-hue-rotate,) var(--tw-invert,) var(--tw-saturate,) var(--tw-sepia,) var(--tw-drop-shadow,)}.transition{transition-property:color,background-color,border-color,outline-color,text-decoration-color,fill,stroke,--tw-gradient-from,--tw-gradient-via,--tw-gradient-to,opacity,box-shadow,transform,translate,scale,rotate,filter,-webkit-backdrop-filter,backdrop-filter,display,content-visibility,overlay,pointer-events;transition-timing-function:var(--tw-ease,var(--default-transition-timing-function));transition-duration:var(--tw-duration,var(--default-transition-duration))}}:root{--bg:#1a1310;--surface:#231a14;--surface2:#2a1f17;--border:#3d2a1e;--accent:#e8702a;--accent2:#f5a06a;--accent-dim:#e8702a1f;--accent-glow:#e8702a40;--bg-glow:#e8702a12;--text:#f5ede6;--text-muted:#9a7a65;--text-dim:#5a3a28;--wrong:#ff5c5c;--wrong-dim:#ff5c5c1f;--yellow:#f5c842;--yellow-dim:#f5c8421f;--blue:#60b0f5;--blue-dim:#60b0f51a;--green:#7ed99a;--green-dim:#7ed99a1a}:root[data-theme=blue]{--bg:#0b111a;--surface:#111924;--surface2:#16202e;--border:#1e2d42;--accent:#4c8bf5;--accent2:#8ab4ff;--accent-dim:#4c8bf51f;--accent-glow:#4c8bf540;--bg-glow:#4c8bf512;--text:#e8edf5;--text-muted:#6a7a95;--text-dim:#2a3a55}:root[data-theme=green]{--bg:#0c1811;--surface:#122219;--surface2:#172b1f;--border:#1e3d2a;--accent:#3fb87f;--accent2:#7ee3ab;--accent-dim:#3fb87f1f;--accent-glow:#3fb87f40;--bg-glow:#3fb87f12;--text:#eaf5ed;--text-muted:#6a9578;--text-dim:#2a5538}:root[data-theme=purple]{--bg:#100e1a;--surface:#181422;--surface2:#1f182b;--border:#2d1e3d;--accent:#a06cf5;--accent2:#c6a3ff;--accent-dim:#a06cf51f;--accent-glow:#a06cf540;--bg-glow:#a06cf512;--text:#f0edf5;--text-muted:#7a6a95;--text-dim:#3a2a55}:root[data-theme=rose]{--bg:#1a0e12;--surface:#241419;--surface2:#2b1820;--border:#3d1e2a;--accent:#f5588a;--accent2:#ff94b8;--accent-dim:#f5588a1f;--accent-glow:#f5588a40;--bg-glow:#f5588a12;--text:#f5edf0;--text-muted:#956a7a;--text-dim:#552a3a}body{background:var(--bg);color:var(--text);min-height:100vh;font-family:Segoe UI,system-ui,-apple-system,sans-serif;font-size:15px;line-height:1.75;overflow-x:hidden}body:before{content:"";background-image:radial-gradient(ellipse 80% 50% at 50% -10%,var(--bg-glow) 0,transparent 70%),url("data:image/svg+xml,%3Csvg width='60' height='60' viewBox='0 0 60 60' xmlns='http://www.w3.org/2000/svg'%3E%3Cg fill='none' fill-rule='evenodd'%3E%3Cg fill='%23f5ede6' fill-opacity='0.02'%3E%3Cpath d='M36 34v-4h-2v4h-4v2h4v4h2v-4h4v-2h-4zm0-30V0h-2v4h-4v2h4v4h2V6h4V4h-4zM6 34v-4H4v4H0v2h4v4h2v-4h4v-2H6zM6 4V0H4v4H0v2h4v4h2V6h4V4H6z'/%3E%3C/g%3E%3C/g%3E%3C/svg%3E");pointer-events:none;z-index:0;position:fixed;inset:0}.public-app{z-index:1;width:min(1160px,100% - 40px);margin:0 auto;position:relative}.public-app main{min-height:65vh}.version-tag{z-index:50;font-family:var(--font-mono);color:var(--text-dim);pointer-events:none;font-size:10px;position:fixed;top:6px;left:8px}.public-header{border-bottom:1px solid var(--border);justify-content:space-between;align-items:center;gap:24px;min-height:76px;display:flex}.public-brand{color:var(--accent2);letter-spacing:-.025em;white-space:nowrap;align-items:center;gap:8px;font-size:19px;font-weight:800;text-decoration:none;display:inline-flex}.public-footer nav,.public-header nav{flex-wrap:wrap;align-items:center;gap:18px;display:flex}.public-footer nav a,.public-header nav a{color:var(--text-muted);font-size:13px;font-weight:650;text-decoration:none}.breadcrumbs a:hover,.public-footer nav a:hover,.public-header nav a:hover,.text-link:hover{color:var(--accent2)}.public-header nav .public-nav-cta{color:#fff;background:var(--accent);border-radius:999px;padding:7px 16px}.public-hero,.public-page-hero{padding:88px 0 72px}.public-hero{text-align:center;max-width:900px;margin:0 auto}.card-kicker,.eyebrow{color:var(--accent);letter-spacing:.13em;text-transform:uppercase;font-size:11px;font-weight:800}.prose-page h1,.public-hero h1,.public-page-hero h1{color:var(--text);letter-spacing:-.052em;text-wrap:balance;margin:12px 0 22px;font-size:clamp(38px,6vw,68px);line-height:1.04}.prose-page h1,.public-page-hero h1{font-size:clamp(35px,5vw,56px)}.public-hero h1 span{color:var(--accent2)}.hero-copy,.lead,.public-page-hero>p:not(.eyebrow){color:#c8ad9b;max-width:820px;font-size:clamp(17px,2vw,20px);line-height:1.65}.public-hero .hero-copy{margin:0 auto}.public-actions{flex-wrap:wrap;gap:12px;margin-top:30px;display:flex}.public-button,.public-hero .public-actions{justify-content:center}.public-button{color:#fff;background:var(--accent);border:1px solid var(--accent);border-radius:10px;align-items:center;gap:8px;min-height:44px;padding:9px 20px;font-weight:750;text-decoration:none;transition:transform .15s,box-shadow .15s;display:inline-flex}.public-button:hover{box-shadow:0 8px 26px var(--accent-glow);transform:translateY(-1px)}.public-button.secondary{color:var(--accent2);border-color:var(--border);background:0 0}.public-section{border-top:1px solid var(--border);padding:54px 0}.public-section>h2,.signup-cta h2{letter-spacing:-.035em;text-wrap:balance;margin:8px 0 18px;font-size:clamp(27px,4vw,40px);line-height:1.15}.public-section>p{max-width:780px}.feature-grid,.formula-grid,.subject-grid,.topic-grid{grid-template-columns:repeat(3,minmax(0,1fr));gap:16px;margin-top:28px;display:grid}.edition-panel,.feature-grid>article,.formula-card,.public-card{background:var(--surface)}@supports (color:color-mix(in lab,red,red)){.edition-panel,.feature-grid>article,.formula-card,.public-card{background:color-mix(in srgb,var(--surface) 92%,transparent)}}.edition-panel,.feature-grid>article,.formula-card,.public-card{border:1px solid var(--border);border-radius:14px;padding:24px}.feature-grid>article h3,.formula-card h3,.public-card h3{margin:9px 0;font-size:18px;line-height:1.25}.curriculum-card>h3 a,.public-card h3 a{color:var(--text);text-decoration:none}.feature-grid>article p,.formula-card p,.public-card p,.public-footer p{color:var(--text-muted)}.feature-icon{color:var(--accent2);margin-bottom:12px;display:block}.text-link{align-items:center;gap:5px;display:inline-flex}.level-links{flex-wrap:wrap;gap:12px;display:flex}.split-section{grid-template-columns:minmax(0,.9fr) minmax(0,1.1fr);align-items:start;gap:50px;display:grid}.curriculum-columns{gap:16px;display:grid}.curriculum-card ul{margin:18px 0 0;padding:0;list-style:none}.curriculum-card li{border-top:1px solid var(--border);padding:13px 0}.curriculum-card li a{color:var(--accent2);font-weight:700;text-decoration:none;display:block}.curriculum-card li span{color:var(--text-muted);margin-top:3px;font-size:12px;line-height:1.5;display:block}.steps-grid{grid-template-columns:repeat(3,minmax(0,1fr));gap:16px;margin:28px 0 0;padding:0;list-style:none;display:grid}.steps-grid li{background:var(--surface);border-left:3px solid var(--accent);border-radius:8px;padding:20px}.steps-grid span,.steps-grid strong{display:block}.steps-grid span{color:var(--text-muted);margin-top:4px}.faq-section details{border-top:1px solid var(--border);padding:17px 4px}.faq-section summary{color:var(--text);cursor:pointer;font-size:17px;font-weight:700}.faq-section details p{color:var(--text-muted);max-width:800px;margin:10px 0 0}.breadcrumbs{padding-top:24px}.breadcrumbs ol{flex-wrap:wrap;gap:8px;margin:0;padding:0;list-style:none;display:flex}.breadcrumbs li{color:var(--text-muted);font-size:12px}.breadcrumbs li:not(:last-child):after{content:"›";color:var(--text-dim);margin-left:8px}.breadcrumbs a,.text-link{color:var(--accent2);font-weight:700;text-decoration:none}.subject-icon{font-size:30px;display:block}.subject-card dl{gap:24px;margin:18px 0;display:flex}.subject-card dl div{gap:6px;display:flex}.subject-card dt{color:var(--text-muted)}.subject-card dd{color:var(--text);margin:0;font-weight:750}.topic-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.source-note,.topic-count{color:var(--text-muted);font-size:12px}.edition-panel h3{margin-top:0}.edition-panel>div+div{border-top:1px solid var(--border);margin-top:16px;padding-top:16px}.edition-panel p{color:var(--text-muted);font-size:13px}.edition-panel a{color:var(--accent2);font-size:12px}.reference-callout,.related-reference{background:linear-gradient(90deg,var(--accent-dim),transparent);padding-left:28px;padding-right:28px}.unit-list{gap:10px;margin-top:24px;display:grid}.unit-list article{border:1px solid var(--border);background:var(--surface);border-radius:10px;grid-template-columns:52px 1fr;align-items:start;gap:16px;padding:15px 18px;display:grid}.unit-list article>span{color:var(--accent);font-size:12px;font-weight:800}.unit-list h3,.unit-list p{margin:0}.unit-list h3{font-size:15px}.unit-list p{font-size:12px}.preview-intro,.unit-list p{color:var(--text-muted)}.public-preview-content{max-width:900px}.signup-cta{background:var(--surface);border:1px solid var(--accent);border-radius:14px;justify-content:space-between;align-items:center;gap:30px;margin:54px 0;padding:30px;display:flex}.signup-cta h2{margin:0;font-size:27px}.signup-cta p{color:var(--text-muted);max-width:700px;margin:5px 0 0}.signup-cta .public-button{flex:none}.feedback-banner{background:var(--surface);border:1px solid var(--accent);border-radius:14px;justify-content:space-between;align-items:center;gap:20px;margin-bottom:24px;padding:22px 26px;display:flex}.feedback-banner h3{align-items:center;gap:8px;margin:0 0 4px;font-size:18px;display:flex}.feedback-banner p{color:var(--text-muted);margin:0;font-size:14px}.feedback-banner .public-button{flex:none}@media (max-width:640px){.feedback-banner{flex-direction:column;align-items:flex-start}}.topic-pagination{border-top:1px solid var(--border);grid-template-columns:repeat(3,1fr);align-items:center;gap:12px;padding-top:25px;display:grid}.topic-pagination a{color:var(--accent2);text-decoration:none}.topic-pagination a:nth-child(2){text-align:center}.topic-pagination a:last-child{text-align:right}.reference-jump{flex-wrap:wrap;gap:8px;margin:-34px 0 50px;display:flex}.reference-jump a{color:var(--accent2);background:var(--surface);border:1px solid var(--border);border-radius:999px;padding:6px 13px;font-size:12px;font-weight:700;text-decoration:none}.formula-grid{grid-template-columns:repeat(2,minmax(0,1fr))}.formula-card dl{margin:16px 0 0}.formula-card dl div{border-top:1px solid var(--border);grid-template-columns:minmax(80px,.35fr) 1fr;gap:12px;padding:7px 0;display:grid}.formula-card dt .katex{color:var(--accent2)}.formula-card dd{color:var(--text-muted);margin:0}.prose-page{max-width:820px;padding:70px 0}.prose-page h2{letter-spacing:-.025em;margin:38px 0 10px;font-size:26px}.prose-page li,.prose-page p{color:#c8ad9b;font-size:16px;line-height:1.7}.prose-page p,.prose-page ul{margin:0 0 14px}.prose-page ul{flex-direction:column;gap:6px;padding-left:22px;list-style:outside;display:flex}.prose-page a{color:var(--accent2)}.public-footer{border-top:1px solid var(--border);grid-template-columns:1fr 1.6fr;gap:28px;margin-top:70px;padding:40px 0 55px;display:grid}.public-footer>div p{margin:4px 0 0;font-size:13px}.footer-email{flex-direction:column;gap:2px;display:inline-flex}.footer-email small{color:var(--text-dim);font-size:11px;font-weight:400}.public-footer .public-disclaimer{border-top:1px solid var(--border);grid-column:1/-1;padding-top:18px;font-size:12px}.blog-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:18px;display:grid}.blog-card h2{margin:14px 0 10px;font-size:24px;line-height:1.2}.blog-card h2 a{color:var(--text);text-decoration:none}.blog-byline,.blog-meta{color:var(--text-muted);flex-wrap:wrap;gap:12px;font-size:12px;display:flex}.tag-list{flex-wrap:wrap;gap:6px;margin:18px 0;display:flex}.tag-list span{color:var(--accent2);background:var(--accent-dim);border-radius:999px;padding:3px 9px;font-size:11px;font-weight:700}.blog-post{max-width:900px;margin:0 auto}.blog-post-header{padding:70px 0 20px}.blog-post-header h1{letter-spacing:-.05em;margin:12px 0 20px;font-size:clamp(38px,6vw,64px);line-height:1.06}.blog-byline{border-top:1px solid var(--border);border-bottom:1px solid var(--border);margin-top:28px;padding:14px 0}.blog-prose{max-width:72ch;padding-top:28px}.blog-prose h2{border-top:1px solid var(--border);margin-top:42px;padding-top:26px;scroll-margin-top:20px}.blog-prose strong{color:var(--accent2)}.blog-prose li{margin-bottom:7px}.blog-prose ol,.blog-prose ul{border:1px solid var(--border);background:#ffffff05;border-radius:10px;padding:16px 20px 16px 40px}.article-sources{background:var(--surface);border:1px solid var(--border);border-radius:12px;padding:22px}.article-sources h2{margin-top:0;font-size:18px}.article-sources li,.article-sources p{color:var(--text-muted);font-size:12px}.article-sources a{color:var(--accent2);overflow-wrap:anywhere}.consent-banner{z-index:50;border:1px solid var(--accent);background:#2a1f17;border-radius:12px;justify-content:space-between;align-items:center;gap:18px;width:min(680px,100% - 36px);margin:0 auto;padding:15px 18px;display:flex;position:fixed;bottom:18px;left:18px;right:18px;box-shadow:0 18px 60px #0006}.consent-banner p{color:var(--text-muted);margin:0;font-size:12px;line-height:1.5}.consent-banner a{color:var(--accent2)}.consent-banner div{flex:none;gap:8px;display:flex}.consent-banner button{color:var(--text-muted);border:1px solid var(--border);cursor:pointer;background:0 0;border-radius:8px;padding:7px 10px}.consent-banner button.accept{color:#fff;background:var(--accent);border-color:var(--accent)}@media (max-width:820px){.public-header{align-items:flex-start;padding:18px 0}.public-header nav{gap:10px}.public-header nav a:not(.public-nav-cta){display:none}.blog-grid,.feature-grid,.formula-grid,.public-footer,.split-section,.steps-grid,.subject-grid,.topic-grid{grid-template-columns:1fr}.consent-banner{flex-direction:column;align-items:stretch}.public-hero,.public-page-hero{padding:60px 0 52px}.signup-cta{flex-direction:column;align-items:stretch}.topic-pagination{grid-template-columns:1fr}.topic-pagination a,.topic-pagination a:last-child,.topic-pagination a:nth-child(2){text-align:left}.public-footer .public-disclaimer{grid-column:auto}}@media (max-width:520px){.public-app{width:min(100% - 28px,1160px)}.prose-page h1,.public-hero h1,.public-page-hero h1{font-size:38px}.edition-panel,.formula-card,.public-card{padding:19px}.content-area.public-preview-content{padding:20px 18px}.formula-card dl div{grid-template-columns:1fr}}.app{max-width:960px;margin:0 auto;padding:0 20px 80px}.app,.app-shell{z-index:1;position:relative}.app-shell{align-items:stretch;min-height:100vh;display:flex}.app-sidebar{background:var(--surface);border-right:1px solid var(--border);flex-direction:column;flex-shrink:0;align-self:flex-start;gap:4px;width:252px;height:100vh;padding:22px 14px 16px;display:flex;position:sticky;top:0;overflow-y:auto}.app-sidebar-brand{color:var(--accent2);letter-spacing:-.02em;border-bottom:1px solid var(--border);margin-bottom:14px;padding:4px 10px 18px;font-size:16px;font-weight:800}.app-sidebar-back,.app-sidebar-brand{align-items:center;gap:8px;text-decoration:none;display:flex}.app-sidebar-back{color:var(--text-muted);margin-bottom:6px;padding:8px 10px;font-size:12px;font-weight:650}.app-sidebar-back:hover{color:var(--accent2)}.app-sidebar-subject{color:var(--text);align-items:flex-start;gap:10px;padding:6px 10px 4px;font-size:14px;font-weight:750;line-height:1.3;display:flex}.app-sidebar-subject-icon{color:var(--accent);flex-shrink:0;font-size:18px}.app-sidebar-subject small{color:var(--text-muted);margin-top:2px;font-size:11px;font-weight:500;display:block}.app-sidebar .progress-bar-wrap{margin:8px 10px 16px}.app-sidebar-nav{flex-direction:column;gap:2px;display:flex}.app-sidebar-nav a{color:var(--text-muted);border-radius:8px;align-items:center;gap:11px;padding:10px 12px;font-size:13.5px;font-weight:650;text-decoration:none;display:flex}.app-sidebar-nav a:hover{background:var(--surface2);color:var(--text)}.app-sidebar-nav a.active{background:var(--accent-dim);color:var(--accent2)}.app-sidebar-footer{border-top:1px solid var(--border);align-items:center;gap:8px;margin-top:auto;padding:14px 10px 4px;display:flex}.app-sidebar-footer .sidebar-auth-link{color:var(--text-muted);font-size:12px;font-weight:650;text-decoration:none}.app-sidebar-footer .sidebar-auth-link:hover{color:var(--accent2)}.app-sidebar-footer .sidebar-cta{color:#fff;background:var(--accent);border-radius:999px;padding:5px 12px;font-size:12px;font-weight:650;text-decoration:none}.app-sidebar-footer .sidebar-cta:hover{filter:brightness(1.1)}.sidebar-feedback-link{color:var(--text-muted);white-space:nowrap;align-items:center;gap:4px;font-size:12px;font-weight:650;text-decoration:none;display:flex}.sidebar-feedback-link:hover{color:var(--accent2)}.sidebar-toggle-btn{z-index:2;border:1px solid var(--border);background:var(--surface);width:28px;height:28px;color:var(--text-muted);cursor:pointer;border-radius:50%;justify-content:center;align-items:center;padding:0;font-size:10px;transition:color .15s,background .15s;display:flex;position:absolute;top:8px;right:-14px}.sidebar-toggle-btn:hover{color:var(--accent2);background:var(--surface2)}.app-sidebar.collapsed{align-items:center;width:60px;padding:22px 8px 16px}.app-sidebar.collapsed .sidebar-label{display:none}.app-sidebar.collapsed .app-sidebar-brand{justify-content:center;padding:4px 0 18px}.app-sidebar.collapsed .app-sidebar-nav a{justify-content:center;padding:10px 6px}.app-sidebar.collapsed .app-sidebar-footer{flex-wrap:wrap;justify-content:center}.app-sidebar .sidebar-icon{flex-shrink:0;font-size:17px;line-height:1}.app-sidebar .sidebar-label{white-space:nowrap}.app-main{flex:1;min-width:0;padding:36px 44px 80px}@media (max-width:860px){.app-shell{flex-direction:column}.app-sidebar{flex-flow:wrap;align-items:center;gap:8px;width:100%;height:auto;padding:12px 14px;position:relative}.app-sidebar-brand{border-bottom:none;margin-bottom:0;margin-right:auto;padding:4px 8px}.app-sidebar .progress-bar-wrap,.app-sidebar-back,.app-sidebar-subject{display:none}.app-sidebar-nav{flex-flow:wrap}.app-sidebar-nav a{padding:7px 10px}.app-sidebar-footer{border-top:none;margin-top:0;padding:0}.app-main{padding:24px 20px 60px}}.theme-grid{flex-wrap:wrap;gap:10px;margin-top:16px;display:flex}.theme-swatch-btn{background:var(--surface);border:1px solid var(--border);color:var(--text);cursor:pointer;border-radius:10px;align-items:center;gap:9px;padding:10px 16px;font-size:13px;font-weight:600;transition:all .15s;display:flex}.theme-swatch-btn:hover{border-color:var(--accent)}.theme-swatch-btn.selected{border-color:var(--accent);background:var(--accent-dim);color:var(--accent2)}.theme-swatch{border:1px solid #00000040;border-radius:50%;flex-shrink:0;width:16px;height:16px;display:inline-block}.progress-bar-wrap{background:var(--border);border-radius:3px;height:3px;margin-bottom:30px}.progress-bar{background:linear-gradient(90deg,var(--accent),var(--accent2));border-radius:3px;height:3px;transition:width .5s}.section-tabs{flex-wrap:wrap;gap:6px;margin-bottom:22px;display:flex}.section-tab{border:1px solid var(--border);cursor:pointer;letter-spacing:.07em;text-transform:uppercase;background:var(--surface);color:var(--text-muted);border-radius:20px;padding:7px 18px;font-size:12px;font-weight:700;transition:all .15s}.section-tab:hover{border-color:var(--accent);color:var(--accent2);background:var(--accent-dim)}.section-tab.active{background:var(--accent);color:#fff;border-color:var(--accent)}.module-grid{grid-template-columns:repeat(auto-fill,minmax(200px,1fr));gap:14px;margin-bottom:32px;display:grid}.portal-links{border-top:1px solid var(--border);flex-wrap:wrap;gap:16px;padding-top:18px;display:flex}.portal-links a{color:var(--text-muted);font-size:12px;font-weight:600;text-decoration:none}.portal-links a:hover{color:var(--accent2)}.module-card{background:var(--surface);border:1px solid var(--border);cursor:pointer;border-radius:12px;padding:18px 18px 14px;transition:all .18s;position:relative;overflow:hidden}.module-card:before{content:"";background:var(--accent);transform-origin:0;height:3px;transition:transform .2s;position:absolute;top:0;left:0;right:0;transform:scaleX(0)}.module-card:hover{border-color:var(--accent);transform:translateY(-2px);box-shadow:0 8px 24px #e8702a1f}.module-card.active:before,.module-card:hover:before{transform:scaleX(1)}.module-card.active{border-color:var(--accent);background:var(--accent-dim)}.module-card.done{border-color:var(--green)}.module-card.done:before{background:var(--green);transform:scaleX(1)}.card-code{letter-spacing:.1em;text-transform:uppercase;color:var(--accent);margin-bottom:6px;font-size:11px;font-weight:700}.card-title{color:var(--text);font-size:14px;font-weight:600;line-height:1.35}.card-meta{color:var(--text-muted);margin-top:8px;font-size:11px}.card-progress{background:var(--border);border-radius:2px;height:2px;margin-top:10px}.card-progress-fill{background:var(--accent);border-radius:2px;height:2px;transition:width .4s}.lesson-header{margin-bottom:24px}.lesson-breadcrumb{color:var(--text-muted);align-items:center;gap:6px;margin-bottom:8px;font-size:12px;display:flex}.lesson-breadcrumb span{color:var(--accent);font-weight:600}.lesson-title{letter-spacing:-.03em;color:var(--text);margin-bottom:6px;font-size:24px;font-weight:700}.lesson-subtitle{color:var(--text-muted);font-size:14px}.subtopic-nav{flex-wrap:wrap;gap:8px;margin-bottom:28px;display:flex}.subtopic-btn{border:1px solid var(--border);cursor:pointer;background:var(--surface);color:var(--text-muted);white-space:nowrap;border-radius:20px;padding:6px 16px;font-size:12px;font-weight:600;transition:all .15s}.subtopic-btn:hover{border-color:var(--accent);color:var(--accent2)}.subtopic-btn.active{background:var(--accent);color:#fff;border-color:var(--accent)}.subtopic-btn.done{border-color:var(--green);color:var(--green)}.content-area{background:var(--surface);border:1px solid var(--border);border-radius:14px;margin-bottom:24px;padding:30px 34px}.content-area h2{letter-spacing:-.02em;color:var(--accent2);margin:0 0 16px;font-size:19px;font-weight:700}.content-area h3{color:var(--text);margin:22px 0 10px;font-size:15px;font-weight:700}.content-area h4{color:var(--accent2);text-transform:uppercase;letter-spacing:.05em;margin:16px 0 8px;font-size:13.5px;font-weight:700}.content-area p{color:var(--text);margin-bottom:14px}.content-area ol,.content-area ul{margin:10px 0 14px 22px}.content-area li{color:var(--text);margin-bottom:7px}.content-area strong{color:var(--accent2)}.content-area em{color:var(--blue);font-style:italic}.content-area table{border-collapse:collapse;width:100%;margin:14px 0;font-size:13.5px}.content-area th{background:var(--surface2);color:var(--accent2);text-align:left;border:1px solid var(--border);padding:9px 12px;font-weight:600}.content-area td{border:1px solid var(--border);color:var(--text);padding:8px 12px}.content-area tr:nth-child(2n) td{background:#ffffff04}.key-box{background:var(--accent-dim);border-left:3px solid var(--accent);border-radius:0 8px 8px 0;margin:16px 0;padding:13px 16px;font-size:14px}.key-box strong{text-transform:uppercase;letter-spacing:.08em;color:var(--accent);margin-bottom:6px;font-size:11px;display:block}.example-box{background:var(--blue-dim);border-left:3px solid var(--blue);border-radius:0 8px 8px 0;margin:16px 0;padding:13px 16px;font-size:14px}.example-box strong{text-transform:uppercase;letter-spacing:.08em;color:var(--blue);margin-bottom:6px;font-size:11px;display:block}.warn-box{background:var(--yellow-dim);border-left:3px solid var(--yellow);border-radius:0 8px 8px 0;margin:16px 0;padding:13px 16px;font-size:14px}.warn-box strong{text-transform:uppercase;letter-spacing:.08em;color:var(--yellow);margin-bottom:6px;font-size:11px;display:block}.derive-box{border-left:3px solid var(--green);background:#7ed99a0f;border-radius:0 8px 8px 0;margin:16px 0;padding:13px 16px;font-size:14px}.derive-box strong{text-transform:uppercase;letter-spacing:.08em;color:var(--green);margin-bottom:6px;font-size:11px;display:block}.math-block{background:var(--surface2);border:1px solid var(--border);text-align:center;border-radius:8px;margin:16px 0;padding:18px 22px;overflow-x:auto}.math-block .katex{color:var(--accent2);font-size:1.1em}.math-inline{white-space:nowrap;background:#e8702a12;border-radius:4px;align-items:center;padding:2px 6px;display:inline-flex}.math-inline .katex{color:var(--accent2)}.eq-row{flex-wrap:wrap;justify-content:space-between;align-items:center;gap:8px;padding:4px 0;display:flex}.var-list{border:1px solid var(--border);background:#ffffff05;border-radius:0 0 8px 8px;margin:-14px 0 18px;padding:12px 22px 14px;font-size:13px}.var-list .var-title{text-transform:uppercase;letter-spacing:.09em;color:var(--text-muted);margin-bottom:7px;font-size:10.5px}.var-row{align-items:baseline;gap:10px;padding:3px 0;display:flex}.var-sym{flex-shrink:0;min-width:64px}.var-sym .katex{color:var(--accent2)}.var-desc{color:var(--text-muted);font-size:13px;line-height:1.5}.wex-step{grid-template-columns:28px 1fr;align-items:start;gap:10px;margin:8px 0;display:grid}.wex-num{background:var(--blue);color:var(--bg);cursor:pointer;border:0;border-radius:50%;flex-shrink:0;justify-content:center;align-items:center;width:20px;height:20px;font-size:11px;font-weight:700;transition:background .15s,transform .15s;display:flex}.wex-num:hover{transform:scale(1.08)}.wex-step.complete .wex-num{background:var(--green)}.wex-step.complete .wex-body{opacity:.62;-webkit-text-decoration:line-through #7ed99a80;text-decoration:line-through #7ed99a80}.wex-prompt{margin:8px 0 12px}.wex-steps:before{content:"Mark each step as you work through it";color:var(--text-muted);margin:8px 0 10px 38px;font-size:11px;display:block}.wex-body{font-size:14px;line-height:1.6}.wex-eq{margin-top:2px;display:block}.wex-eq .katex{color:var(--accent2)}.wex-why{color:var(--text-muted);margin-top:2px;font-size:12.5px;font-style:italic;display:block}.wex-result{color:var(--blue);background:#60b0f514;border-radius:6px;margin-top:10px;padding:8px 12px;font-weight:600}.ref-formula-block{text-align:center;background:#ffffff05;border-radius:6px;margin:8px 0;padding:10px 8px}.ref-formula-block .katex{color:var(--accent2)}.ref-vars{color:var(--text-muted);margin-top:6px;font-size:11.5px;line-height:1.7}.ref-vars b{color:var(--text);font-weight:600}.quiz-area{background:var(--surface2);border:1px solid var(--border);border-radius:14px;padding:24px 28px}.quiz-area h3{color:var(--text-muted);text-transform:uppercase;letter-spacing:.08em;margin-bottom:14px;font-size:14px;font-weight:700}.quiz-q{color:var(--text);margin-bottom:18px;font-size:15px;line-height:1.65}.quiz-opts{flex-direction:column;gap:9px;margin-bottom:18px;display:flex}.quiz-opt{background:var(--surface);border:1px solid var(--border);cursor:pointer;color:var(--text);text-align:left;border-radius:8px;padding:11px 16px;font-size:14px;transition:all .15s}.quiz-opt:hover:not([disabled]){border-color:var(--accent);background:var(--accent-dim);color:var(--accent2)}.quiz-opt.correct{background:var(--green-dim);border-color:var(--green);color:var(--green)}.quiz-opt.wrong{background:var(--wrong-dim);border-color:var(--wrong);color:var(--wrong)}.quiz-opt[disabled]{cursor:default}.quiz-explain{background:var(--surface);border:1px solid var(--green);color:var(--text);border-radius:8px;margin-top:10px;padding:13px 16px;font-size:13.5px;display:none}.quiz-explain.show{display:block}.quiz-explanation-title{color:var(--green);letter-spacing:.08em;text-transform:uppercase;font-size:11px;font-weight:800;display:block}.quiz-explanation-steps ol{counter-reset:answer-step;margin:10px 0 0;padding:0;list-style:none}.quiz-explanation-steps li{counter-increment:answer-step;grid-template-columns:22px 1fr;gap:9px;margin-top:8px;display:grid}.quiz-explanation-steps li:before{content:counter(answer-step);background:var(--green-dim);border:1px solid var(--green);color:var(--green);border-radius:50%;justify-content:center;align-items:center;width:20px;height:20px;font-size:10px;display:inline-flex}.quiz-num-wrap{flex-wrap:wrap;align-items:center;gap:8px;margin-bottom:14px;display:flex}.quiz-num-input{background:var(--surface);border:1px solid var(--border);width:130px;color:var(--text);border-radius:8px;padding:9px 14px;font-size:14px}.quiz-num-input:focus{border-color:var(--accent);outline:none}.quiz-unit{color:var(--text-muted);font-size:13px}.quiz-submit{background:var(--accent);color:#fff;cursor:pointer;border:none;border-radius:8px;padding:9px 20px;font-size:14px;font-weight:600;transition:opacity .15s}.quiz-submit:hover{opacity:.85}.quiz-feedback{align-items:center;gap:6px;margin-top:10px;font-size:13.5px;font-weight:600;display:flex}.quiz-feedback.correct{color:var(--green)}.quiz-feedback.wrong{color:var(--wrong)}.nav-btns{flex-wrap:wrap;gap:10px;margin-top:6px;display:flex}.nav-btn{background:var(--surface);border:1px solid var(--border);color:var(--text-muted);cursor:pointer;border-radius:8px;align-items:center;gap:6px;padding:10px 22px;font-size:13px;font-weight:600;transition:all .15s;display:inline-flex}.nav-btn:hover{border-color:var(--accent);color:var(--accent2);background:var(--accent-dim)}.nav-btn.primary{background:var(--accent);color:#fff;border-color:var(--accent)}.nav-btn.primary:hover{opacity:.85}.dash-grid{grid-template-columns:repeat(auto-fill,minmax(160px,1fr));gap:14px;margin:20px 0;display:grid}.dash-stat{background:var(--surface);border:1px solid var(--border);text-align:center;border-radius:10px;padding:18px}.dash-stat .val{color:var(--accent);letter-spacing:-.04em;font-size:28px;font-weight:800}.dash-stat .lbl{color:var(--text-muted);text-transform:uppercase;letter-spacing:.07em;margin-top:4px;font-size:12px}.ref-search{background:var(--surface);border:1px solid var(--border);width:100%;color:var(--text);border-radius:8px;margin-bottom:20px;padding:11px 16px;font-size:14px}.ref-search:focus{border-color:var(--accent);outline:none}.ref-group{margin-bottom:24px}.ref-group-title{text-transform:uppercase;letter-spacing:.1em;color:var(--accent);border-bottom:1px solid var(--border);margin-bottom:12px;padding-bottom:6px;font-size:12px;font-weight:700}.ref-items{grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:10px;display:grid}.ref-item{background:var(--surface);border:1px solid var(--border);border-radius:8px;padding:13px 15px}.ref-name{color:var(--text-muted);text-transform:uppercase;letter-spacing:.04em;margin-bottom:6px;font-size:12px;font-weight:600}.ref-formula{color:var(--accent2);font-size:14.5px}.ref-note{color:var(--text-dim);margin-top:4px;font-size:11.5px}.ref-def{color:var(--blue);border-left:2px solid var(--blue);margin:5px 0 6px;padding-left:7px;font-size:11.5px;font-style:italic;line-height:1.5}.subject-list{flex-direction:column;gap:10px;max-width:560px;margin-bottom:28px;display:flex}.subject-row{background:var(--surface);border:1px solid var(--border);border-radius:12px;align-items:center;gap:14px;padding:12px 16px;transition:all .15s;display:flex}.subject-row.selected{border-color:var(--accent);background:var(--accent-dim)}.subject-row-icon{text-align:center;flex-shrink:0;width:22px;font-size:18px}.subject-row-name{color:var(--text);text-overflow:ellipsis;white-space:nowrap;flex:1;min-width:0;font-size:14px;font-weight:600;overflow:hidden}.level-switch{background:var(--surface2);border:1px solid var(--border);border-radius:16px;flex-shrink:0;width:84px;height:30px;display:inline-flex;position:relative;overflow:hidden}.level-switch-thumb{background:var(--accent);z-index:0;border-radius:14px;width:calc(50% - 2px);transition:transform .2s;position:absolute;inset:2px}.level-switch-opt{z-index:1;color:var(--text-muted);letter-spacing:.03em;cursor:pointer;background:0 0;border:none;flex:1;font-size:11px;font-weight:700;transition:color .15s;position:relative}.level-switch-opt.active{color:#fff}.select-btn{border:1px solid var(--border);color:var(--text-muted);cursor:pointer;letter-spacing:.04em;text-transform:uppercase;white-space:nowrap;background:0 0;border-radius:20px;flex-shrink:0;padding:7px 16px;font-size:12px;font-weight:700;transition:all .15s}.select-btn:hover{border-color:var(--accent);color:var(--accent2)}.select-btn.selected{background:var(--accent);border-color:var(--accent);color:#fff}.sticky-bar{background:linear-gradient(0deg,var(--bg) 60%,transparent);flex-wrap:wrap;justify-content:space-between;align-items:center;gap:16px;padding:20px 0 8px;display:flex;position:sticky;bottom:0}.selected-count{color:var(--text-muted);font-size:13px}.form-error{color:var(--wrong);font-size:12px;font-weight:500;display:block}.selected-count strong{color:var(--accent2)}.build-btn{background:var(--accent);color:#fff;cursor:pointer;letter-spacing:.02em;border:none;border-radius:10px;padding:13px 28px;font-size:14px;font-weight:700;transition:opacity .15s}.build-btn:hover:not(:disabled){opacity:.85}.build-btn:disabled{opacity:.35;cursor:not-allowed}.dash-toolbar{flex-wrap:wrap;justify-content:space-between;align-items:center;gap:12px;margin-bottom:22px;display:flex}.edit-btn{border:1px solid var(--border);color:var(--text-muted);cursor:pointer;letter-spacing:.04em;text-transform:uppercase;background:0 0;border-radius:20px;padding:8px 18px;font-size:12px;font-weight:600;transition:all .15s}.edit-btn:hover{background:var(--accent-dim);border-color:var(--accent);color:var(--accent2)}.module-card-top{justify-content:space-between;align-items:center;margin-bottom:12px;display:flex}.mc-icon{align-items:center;font-size:26px;display:inline-flex}.mc-badge{letter-spacing:.06em;text-transform:uppercase;border-radius:12px;padding:3px 9px;font-size:10px;font-weight:700}.mc-badge.ready{background:var(--green-dim);color:var(--green)}.mc-badge.soon{background:var(--yellow-dim);color:var(--yellow)}.mc-actions{align-items:center;gap:8px;display:flex}.card-remove-btn{border:1px solid var(--border);width:22px;height:22px;color:var(--text-muted);cursor:pointer;background:0 0;border-radius:50%;justify-content:center;align-items:center;font-size:11px;line-height:1;transition:all .15s;display:inline-flex}.card-remove-btn:hover{background:var(--wrong-dim);border-color:var(--wrong);color:var(--wrong)}.card-remove-btn:disabled{opacity:.5;cursor:default}.mc-level{color:var(--accent2);text-transform:uppercase;letter-spacing:.06em;margin:4px 0 8px;font-size:11px;font-weight:700}.mc-desc{color:var(--text-muted);margin-bottom:14px;font-size:12.5px;line-height:1.5}.mc-cta{color:var(--accent2);gap:5px;font-size:12.5px;font-weight:700}.fc-subject-filter,.mc-cta{align-items:center;display:flex}.fc-subject-filter{flex-wrap:wrap;gap:10px;margin-bottom:18px}.fc-subject-hint{color:var(--text-muted);flex-basis:100%;margin:2px 0 0;font-size:12px}.fc-subject-hint a{color:var(--text-muted);text-decoration:underline}.fc-subject-filter label{text-transform:uppercase;letter-spacing:.06em;color:var(--text-muted);font-size:11.5px}.fc-subject-filter select{background:var(--surface2);border:1px solid var(--border);color:var(--text);cursor:pointer;border-radius:8px;padding:9px 14px;font-size:14px}.fc-subject-filter select:focus{border-color:var(--accent);outline:none}.fc-subject-filter select:disabled{opacity:.6;cursor:not-allowed}.fc-tabs{flex-wrap:wrap;gap:8px;margin-bottom:22px;display:flex}.fc-tab{border:1px solid var(--border);color:var(--text-muted);cursor:pointer;background:0 0;border-radius:20px;padding:9px 18px;font-size:13px;font-weight:600}.fc-tab:hover{border-color:var(--accent);color:var(--accent2)}.fc-tab.active{background:var(--accent);border-color:var(--accent);color:#fff}.fc-form{background:var(--surface2);border:1px solid var(--border);border-radius:14px;margin-bottom:26px;padding:20px 24px}.fc-form h3{color:var(--accent2);margin-bottom:14px;font-size:14px;font-weight:700}.fc-form-row{flex-direction:column;gap:6px;margin-bottom:14px;display:flex}.fc-form-row label{text-transform:uppercase;letter-spacing:.06em;color:var(--text-muted);font-size:11.5px}.fc-form textarea{background:var(--surface);border:1px solid var(--border);color:var(--text);resize:vertical;border-radius:8px;min-height:44px;padding:10px 14px;font-family:inherit;font-size:14px}.fc-form textarea:focus{border-color:var(--accent);outline:none}.fc-form-actions{gap:10px;display:flex}.fc-form-cancel{border:1px solid var(--border);color:var(--text-muted);cursor:pointer;background:0 0;border-radius:8px;padding:9px 18px;font-size:13px}.fc-deck-empty{text-align:center;color:var(--text-muted);border:1px dashed var(--border);border-radius:14px;margin-bottom:26px;padding:40px 20px;font-size:14px}.fc-deck{margin-bottom:30px}.fc-card,.fc-deck{flex-direction:column;align-items:center;display:flex}.fc-card{background:var(--surface2);border:1px solid var(--border);text-align:center;cursor:pointer;width:100%;max-width:520px;min-height:220px;color:var(--text);border-radius:16px;justify-content:center;padding:28px;font-size:17px;line-height:1.6;transition:border-color .15s}.fc-card:hover{border-color:var(--accent)}.fc-card-label{text-transform:uppercase;letter-spacing:.09em;color:var(--text-muted);margin-bottom:12px;font-size:10.5px}.fc-card.flipped .fc-card-label{color:var(--accent2)}.fc-card-hint{color:var(--text-dim);margin-top:16px;font-size:11.5px}.fc-deck-controls{align-items:center;gap:16px;margin-top:18px;display:flex}.cookie-popup{z-index:60;width:min(390px,100% - 36px);color:var(--text);background:var(--surface2);border:1px solid var(--accent);border-radius:16px;padding:22px;position:fixed;bottom:22px;right:22px;box-shadow:0 22px 70px #00000085}.cookie-popup>svg{color:var(--accent2)}.cookie-popup p{margin:10px 24px 16px 0;font-size:15px;line-height:1.55}.cookie-popup>div{flex-wrap:wrap;gap:8px;display:flex}.cookie-popup button{color:var(--text);background:var(--surface);border:1px solid var(--border);cursor:pointer;border-radius:8px;padding:7px 13px}.cookie-popup button:hover{color:var(--accent2);border-color:var(--accent)}.cookie-popup .cookie-popup-close{place-items:center;padding:5px;display:grid;position:absolute;top:12px;right:12px}.fc-deck-count{color:var(--text-muted);text-align:center;min-width:60px;font-size:13px}.fc-manage{margin-top:10px}.fc-manage h3{color:var(--text-muted);text-transform:uppercase;letter-spacing:.08em;margin-bottom:14px;font-size:14px;font-weight:700}.fc-row{background:var(--surface);border:1px solid var(--border);border-radius:10px;align-items:center;gap:12px;margin-bottom:8px;padding:12px 16px;display:flex}.fc-row-text{flex:1;min-width:0;font-size:13.5px}.fc-row-front{color:var(--text);margin-bottom:2px}.fc-row-back{color:var(--text-muted)}.fc-row-actions{flex-shrink:0;gap:6px;display:flex}.fc-row-btn{border:1px solid var(--border);color:var(--text-muted);cursor:pointer;background:0 0;border-radius:6px;padding:6px 12px;font-size:12px}.fc-row-btn:hover{border-color:var(--accent);color:var(--accent2)}.fc-row-btn.danger:hover{border-color:var(--wrong);color:var(--wrong)}.unit-practice{margin-top:8px}.unit-practice .quiz-area{margin-bottom:16px}.case-study{background:var(--surface2);border:1px solid var(--border);border-radius:14px;margin-top:24px;padding:24px 28px}.case-study h3{color:var(--text-muted);text-transform:uppercase;letter-spacing:.08em;margin:0 0 14px;font-size:14px;font-weight:700}.case-study-scenario{color:var(--text);background:var(--surface);border:1px solid var(--border);border-radius:10px;margin-bottom:20px;padding:16px 18px;font-size:14.5px;line-height:1.7}.case-study-scenario p:first-child{margin-top:0}.case-study-scenario p:last-child{margin-bottom:0}.case-study-q{border-top:1px solid var(--border);padding:18px 0}.case-study-q:first-of-type{border-top:none;padding-top:0}.case-study-q-head{justify-content:space-between;align-items:baseline;gap:14px;margin-bottom:12px;display:flex}.case-study-q-text{color:var(--text);font-size:15px;line-height:1.6}.case-study-q-text p:first-child{margin-top:0}.case-study-q-text p:last-child{margin-bottom:0}.case-study-marks{letter-spacing:.04em;text-transform:uppercase;color:var(--accent2);white-space:nowrap;flex-shrink:0;font-size:11px;font-weight:700}.case-study-answer{background:var(--accent-dim);border:1px solid var(--border);color:var(--text);border-radius:10px;margin-top:14px;padding:14px 16px;font-size:14px;line-height:1.65}.case-study-answer p:first-child{margin-top:0}.case-study-answer p:last-child{margin-bottom:0}@media (max-width:600px){.content-area{padding:20px 18px}.lesson-title{font-size:19px}.module-grid{grid-template-columns:1fr 1fr}.subject-row{gap:8px;padding:10px 12px}.subject-row-name{font-size:13px}.level-switch{width:68px}.select-btn{padding:7px 10px;font-size:11px}}@property --tw-rotate-x{syntax:"*";inherits:false}@property --tw-rotate-y{syntax:"*";inherits:false}@property --tw-rotate-z{syntax:"*";inherits:false}@property --tw-skew-x{syntax:"*";inherits:false}@property --tw-skew-y{syntax:"*";inherits:false}@property --tw-border-style{syntax:"*";inherits:false;initial-value:solid}@property --tw-shadow{syntax:"*";inherits:false;initial-value:0 0 #0000}@property --tw-shadow-color{syntax:"*";inherits:false}@property --tw-shadow-alpha{syntax:"<percentage>";inherits:false;initial-value:100%}@property --tw-inset-shadow{syntax:"*";inherits:false;initial-value:0 0 #0000}@property --tw-inset-shadow-color{syntax:"*";inherits:false}@property --tw-inset-shadow-alpha{syntax:"<percentage>";inherits:false;initial-value:100%}@property --tw-ring-color{syntax:"*";inherits:false}@property --tw-ring-shadow{syntax:"*";inherits:false;initial-value:0 0 #0000}@property --tw-inset-ring-color{syntax:"*";inherits:false}@property --tw-inset-ring-shadow{syntax:"*";inherits:false;initial-value:0 0 #0000}@property --tw-ring-inset{syntax:"*";inherits:false}@property --tw-ring-offset-width{syntax:"<length>";inherits:false;initial-value:0}@property --tw-ring-offset-color{syntax:"*";inherits:false;initial-value:#fff}@property --tw-ring-offset-shadow{syntax:"*";inherits:false;initial-value:0 0 #0000}@property --tw-outline-style{syntax:"*";inherits:false;initial-value:solid}@property --tw-blur{syntax:"*";inherits:false}@property --tw-brightness{syntax:"*";inherits:false}@property --tw-contrast{syntax:"*";inherits:false}@property --tw-grayscale{syntax:"*";inherits:false}@property --tw-hue-rotate{syntax:"*";inherits:false}@property --tw-invert{syntax:"*";inherits:false}@property --tw-opacity{syntax:"*";inherits:false}@property --tw-saturate{syntax:"*";inherits:false}@property --tw-sepia{syntax:"*";inherits:false}@property --tw-drop-shadow{syntax:"*";inherits:false}@property --tw-drop-shadow-color{syntax:"*";inherits:false}@property --tw-drop-shadow-alpha{syntax:"<percentage>";inherits:false;initial-value:100%}@property --tw-drop-shadow-size{syntax:"*";inherits:false}