:root{--ink:#0a0a0a;--ink-soft:#2a2a2a;--muted:#6b6b6b;--muted-2:#8a8a8a;--line:#dcdcdc;--line-strong:#0a0a0a;--paper:#f6f6f6;--paper-2:#eeeeee;--white:#ffffff;--black:#0a0a0a;--danger:#2f2f2f;--ok:#0a0a0a;--font-display:"Newsreader","Times New Roman",serif;--font-body:"IBM Plex Sans","Helvetica Neue",sans-serif;--radius:2px;--nav-h:4rem;--max:1080px;--ease:cubic-bezier(0.22,1,0.36,1)}*{box-sizing:border-box}iframe,img,video{max-width:100%;height:auto}html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}body,html{margin:0;padding:0;min-height:100%;max-width:100%;overflow-x:clip;color:var(--ink);font-family:var(--font-body);font-weight:400;line-height:1.55;letter-spacing:-.01em;background-color:var(--paper);background-image:linear-gradient(180deg,#ffffff 0,var(--paper) 42%,#f0f0f0 100%),repeating-linear-gradient(0deg,transparent,transparent 47px,rgba(10,10,10,.025) 48px);background-attachment:fixed}body{min-height:100vh;min-height:100dvh;display:flex;flex-direction:column}body:before{content:"";position:fixed;inset:0;pointer-events:none;z-index:0;background:radial-gradient(900px 480px at 0 0,rgba(10,10,10,.05),transparent 60%),radial-gradient(700px 420px at 100% 10%,rgba(10,10,10,.04),transparent 55%)}body>*{position:relative;z-index:1}a{color:var(--ink);text-decoration:none;border-bottom:1px solid transparent;transition:border-color .25s var(--ease),color .25s var(--ease)}a:hover{border-bottom-color:var(--ink)}.lesson-list a,.lesson-list a:hover,.nav a,.nav a:hover,.site-footer-brand-link,.site-footer-brand-link:hover,.table-link,.table-link:hover,a.brand,a.brand:hover{border-bottom:none}a.btn,a.btn:active,a.btn:focus,a.btn:hover{border:1px solid var(--black);text-decoration:none}a.btn.secondary,a.btn.secondary:focus,a.btn.secondary:hover{border:1px solid var(--black)}a.btn.ghost,a.btn.ghost:hover{border-color:transparent}main{max-width:var(--max);width:100%;margin:0 auto;padding:2.25rem max(1.5rem,env(safe-area-inset-right)) 4rem max(1.5rem,env(safe-area-inset-left));overflow-x:clip;min-width:0}main.narrow{max-width:420px;padding-top:4rem}h1,h2,h3{font-family:var(--font-display);font-weight:500;letter-spacing:-.02em;line-height:1.15;color:var(--ink)}h1{font-size:clamp(2rem,4.5vw,2.75rem);margin:0 0 .75rem}h2{font-size:1.45rem}h2,h3{margin:0 0 .5rem}h3{font-size:1.15rem}p{margin:0 0 1rem}.eyebrow,.muted{color:var(--muted)}.eyebrow{margin:0 0 .75rem;font-size:.72rem;font-weight:500;letter-spacing:.16em;text-transform:uppercase}.page-header{margin-bottom:2rem;padding-bottom:1.25rem;border-bottom:1px solid var(--line);animation:rise .6s var(--ease) both}.page-header p{max-width:36rem;margin:0;color:var(--muted)}.nav{position:-webkit-sticky;position:sticky;top:0;z-index:40;display:flex;align-items:center;gap:1.5rem;min-height:var(--nav-h);padding:env(safe-area-inset-top) max(1.5rem,env(safe-area-inset-right)) 0 max(1.5rem,env(safe-area-inset-left));background:rgba(255,255,255,.92);border-bottom:1px solid var(--line);-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);width:100%;max-width:100%}.nav-toggle{display:none;flex-direction:column;justify-content:center;gap:5px;width:2.75rem;height:2.75rem;min-width:44px;min-height:44px;padding:0;border:1px solid var(--line);border-radius:var(--radius);background:var(--white);cursor:pointer;-webkit-tap-highlight-color:transparent}.nav-toggle span{display:block;width:1.1rem;height:1.5px;margin:0 auto;background:var(--ink);transition:transform .2s var(--ease),opacity .2s var(--ease)}.nav-toggle[aria-expanded=true] span:first-child{transform:translateY(6.5px) rotate(45deg)}.nav-toggle[aria-expanded=true] span:nth-child(2){opacity:0}.nav-toggle[aria-expanded=true] span:nth-child(3){transform:translateY(-6.5px) rotate(-45deg)}body.nav-open{overflow:hidden}.nav-links{display:flex;align-items:center;gap:1.25rem;margin-left:auto}.nav a{font-size:.84rem;font-weight:500;letter-spacing:.04em;text-transform:uppercase;color:var(--ink-soft);position:relative}.nav a:after{content:"";position:absolute;left:0;right:0;bottom:-.35rem;height:1px;background:var(--ink);transform:scaleX(0);transform-origin:left;transition:transform .28s var(--ease)}.nav a:hover{color:var(--ink)}.nav a:hover:after{transform:scaleX(1)}.nav .user-email{font-size:.8rem;color:var(--muted);letter-spacing:0;text-transform:none;font-weight:400}.nav-signout{-webkit-appearance:none;-moz-appearance:none;appearance:none;background:transparent;border:0;padding:0;margin:0;cursor:pointer;font:inherit;font-size:.84rem;font-weight:500;letter-spacing:.04em;text-transform:uppercase;color:var(--ink-soft)}.nav-signout:hover{color:var(--ink)}.nav-signout:disabled{opacity:.55;cursor:wait}.brand{font-family:var(--font-display);font-size:1.55rem;font-weight:600;letter-spacing:.04em;color:var(--ink);line-height:1}.brand.brand-with-logo{display:inline-flex;align-items:center;gap:.5rem;border-bottom:none}.brand-logo-nav{width:3.25rem;height:3.25rem}.brand-logo-footer{width:2.85rem;height:2.85rem}.brand-logo{display:block;width:auto;height:auto;object-fit:contain;object-position:center}.brand-logo-auth{width:3.5rem;height:3.5rem;margin-bottom:1.25rem}.brand-logo-hero{width:min(12rem,42vw);height:auto;max-height:12rem}.hero-brand-wrap{margin:.2rem 0 1.35rem;animation:brandIn .9s var(--ease) both}.hero-visual-logo{position:absolute;inset:0;display:grid;place-items:center;opacity:.35}.hero-visual-logo .brand-logo-hero{width:min(16rem,50%);max-height:none}.visually-hidden{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}.route-loading{min-height:40vh;display:grid;place-content:center;grid-gap:1rem;gap:1rem;padding:2rem 1rem;text-align:center}.route-loading-bar{width:min(220px,60vw);height:2px;margin:0 auto;background:var(--paper-2);overflow:hidden;position:relative}.route-loading-bar:after{content:"";position:absolute;inset:0 auto 0 0;width:40%;background:var(--black);animation:loadingSweep .9s var(--ease) infinite}@keyframes loadingSweep{0%{transform:translateX(-120%)}to{transform:translateX(280%)}}.brand span{font-weight:400;opacity:.55}.panel{background:var(--white);border:1px solid var(--line);border-radius:var(--radius);padding:1.35rem 1.4rem}.panel+.panel{margin-top:1rem}.panel-interactive{transition:border-color .25s var(--ease),transform .25s var(--ease)}.panel-interactive:hover{border-color:var(--ink);transform:translateY(-1px)}.btn{display:inline-flex;align-items:center;justify-content:center;gap:.45rem;min-height:2.75rem;padding:.75rem 1.25rem;border:1px solid var(--black);border-radius:var(--radius);background:var(--black);font-family:var(--font-body);font-size:.82rem;font-weight:500;letter-spacing:.08em;line-height:1.25;text-transform:uppercase;text-align:center;cursor:pointer;overflow:visible;touch-action:manipulation;transition:background .25s var(--ease),color .25s var(--ease),transform .2s var(--ease);-webkit-tap-highlight-color:transparent}.btn,.btn:hover{color:var(--white)}.btn:hover{background:var(--ink-soft);border-bottom-color:var(--black)}.btn.secondary{background:transparent;color:var(--ink)}.btn.secondary:hover{background:var(--black);color:var(--white)}.btn:disabled{opacity:.45;cursor:not-allowed;transform:none}.btn.ghost{background:transparent;border-color:transparent;color:var(--ink);padding-inline:.4rem}input,select,textarea{width:100%;min-height:2.65rem;padding:.65rem .8rem;border:1px solid var(--line);border-radius:var(--radius);background:var(--white);color:var(--ink);font:inherit;transition:border-color .2s var(--ease)}input:focus,select:focus,textarea:focus{outline:none;border-color:var(--ink)}label{display:block;margin-bottom:.4rem;color:var(--muted);font-size:.78rem;font-weight:500;letter-spacing:.08em;text-transform:uppercase}.field{margin-bottom:1.1rem}.field-inline{display:flex;gap:.55rem;align-items:center;margin-bottom:.55rem;text-transform:none;letter-spacing:0;font-size:.95rem;color:var(--ink);font-weight:400}.field-inline input{width:auto;min-height:auto}.grid{display:grid;grid-gap:1rem;gap:1rem;grid-template-columns:repeat(auto-fill,minmax(280px,1fr))}.course-card{display:flex;flex-direction:column;max-width:420px;width:100%}.course-card .form-actions{margin-top:auto}.catalog-list{display:grid;grid-gap:0;gap:0;width:100%;border:1px solid var(--line);background:var(--white)}.catalog-row{display:grid;grid-template-columns:minmax(0,1fr) auto;grid-gap:2rem;gap:2rem;align-items:center;padding:1.65rem 1.5rem;border-bottom:1px solid var(--line);transition:background .2s var(--ease);min-width:0}.catalog-row:last-child{border-bottom:none}.catalog-row:hover{background:#fafafa}.catalog-row-main{min-width:0}.catalog-row-main .course-title{margin:.15rem 0 .55rem}.catalog-row-main .course-title a{border-bottom:none}.catalog-row-main .course-title a:hover{border-bottom:1px solid var(--ink)}.catalog-row-main .course-card-desc{max-width:42rem;margin-bottom:0;display:block;-webkit-line-clamp:unset;overflow:visible}.catalog-dot{margin:0 .35rem}.catalog-progress{margin-top:1rem;max-width:280px}.catalog-row-aside{display:flex;flex-direction:column;align-items:flex-end;gap:.9rem;text-align:right;min-width:11.5rem}.catalog-row-aside .course-price{font-size:1.5rem;margin:0}.catalog-row-aside .form-actions{display:flex;flex-wrap:wrap;justify-content:flex-end;gap:.5rem;margin:0}.stat-grid{display:grid;grid-gap:0;gap:0;grid-template-columns:repeat(auto-fill,minmax(160px,1fr));border:1px solid var(--line);background:var(--white)}.stat{padding:1.35rem 1.25rem;border-right:1px solid var(--line);border-bottom:1px solid var(--line)}.stat h3{margin:0 0 .65rem;font-family:var(--font-body);font-size:.72rem;font-weight:500;letter-spacing:.12em;text-transform:uppercase;color:var(--muted)}.stat-value{font-family:var(--font-display);font-size:2.4rem;font-weight:500;line-height:1;margin:0}.progress{height:2px;background:var(--paper-2);overflow:hidden}.progress>span{display:block;height:100%;background:var(--black);transform-origin:left;animation:progressIn .8s var(--ease) both}.progress-meta{display:flex;justify-content:space-between;gap:1rem;margin-top:.45rem;font-size:.8rem;color:var(--muted)}table{width:100%;border-collapse:collapse;background:var(--white);border:1px solid var(--line)}.table-wrap{width:100%;max-width:100%;min-width:0}td,th{text-align:left;padding:.85rem 1rem;border-bottom:1px solid var(--line);vertical-align:top;overflow-wrap:anywhere;word-break:break-word}th{font-size:.72rem;font-weight:500;letter-spacing:.1em;text-transform:uppercase;color:var(--muted);background:#fafafa}tr:last-child td{border-bottom:none}.chat{display:flex;flex-direction:column;gap:.65rem;max-height:420px;overflow:auto;padding:.25rem 0 .75rem}.bubble{max-width:92%;padding:.85rem 1rem;border:1px solid var(--line);background:var(--white);white-space:pre-wrap;font-size:.95rem}.bubble.user{align-self:flex-end;background:var(--black);color:var(--white);border-color:var(--black)}.bubble.assistant{align-self:flex-start}.lesson-list{list-style:none;margin:.75rem 0 0;padding:0}.lesson-list li{border-top:1px solid var(--line)}.lesson-list a{display:flex;align-items:center;justify-content:space-between;padding:.85rem 0;font-size:.98rem;transition:padding-left .25s var(--ease)}.lesson-list a:hover{padding-left:.35rem}.lesson-list a:after{content:"→";color:var(--muted);font-size:.9rem}.module-block{margin-bottom:1.5rem;padding-bottom:.25rem;border-bottom:1px solid var(--line)}.module-block:last-child{border-bottom:none}.module-block h2{font-size:1.25rem}.feedback-ko,.feedback-ok{margin-top:.85rem;padding:.75rem .9rem;border:1px solid var(--line);font-size:.92rem}.feedback-ok{border-left:3px solid var(--black);background:#fafafa}.feedback-ko{border-left:3px solid var(--muted-2);color:var(--ink-soft);background:#f7f7f7}.form-actions{display:flex;gap:.75rem;flex-wrap:wrap;margin-top:.35rem}.auth-shell{min-height:100vh;min-height:100dvh;display:grid;place-items:center;padding:max(2rem,env(safe-area-inset-top)) max(1rem,env(safe-area-inset-right)) max(2rem,env(safe-area-inset-bottom)) max(1rem,env(safe-area-inset-left));width:100%;max-width:100%;overflow-x:clip}.auth-panel{width:min(100%,420px);background:var(--white);border:1px solid var(--line);padding:2rem 1.75rem 1.75rem;animation:rise .55s var(--ease) both}.auth-panel .brand{display:inline-block;margin-bottom:1.5rem}.auth-panel h1{font-size:1.85rem;margin-bottom:.35rem}.auth-panel .lead{margin-bottom:1.5rem;color:var(--muted);font-size:.95rem}.auth-footer{margin:1.25rem 0 0;font-size:.9rem;color:var(--muted)}.error-text{color:var(--danger);font-size:.9rem;margin:0 0 1rem}.hero{position:relative;isolation:isolate;min-height:calc(100vh - var(--nav-h));min-height:calc(100dvh - var(--nav-h));display:grid;align-items:end;background:#070707;color:var(--white);overflow:clip;width:100%;max-width:100%}.hero-backdrop{position:absolute;inset:0;z-index:0;pointer-events:none;overflow:clip;background:radial-gradient(90% 70% at 88% 12%,rgba(255,255,255,.09),transparent 55%),radial-gradient(70% 55% at 8% 88%,rgba(255,255,255,.05),transparent 50%),linear-gradient(160deg,#0c0c0c,#050505 55%,#111);animation:fadeIn 1.1s var(--ease) both}.hero-grid{position:absolute;inset:0;opacity:.22;background-image:linear-gradient(rgba(255,255,255,.06) 1px,transparent 0),linear-gradient(90deg,rgba(255,255,255,.06) 1px,transparent 0);background-size:56px 56px;-webkit-mask-image:linear-gradient(180deg,rgba(0,0,0,.85),transparent 92%);mask-image:linear-gradient(180deg,rgba(0,0,0,.85),transparent 92%);animation:gridDrift 28s linear infinite;will-change:transform;contain:paint}.hero-orb{position:absolute;border-radius:50%;filter:blur(2px);opacity:.35}.hero-orb-a{width:min(42vw,420px);height:min(42vw,420px);right:-6%;top:8%;border:1px solid rgba(255,255,255,.18);animation:frameIn 1.2s var(--ease) .1s both}.hero-orb-b{width:min(28vw,260px);height:min(28vw,260px);right:14%;top:28%;border:1px solid rgba(255,255,255,.1);animation:frameIn 1.3s var(--ease) .22s both}.hero-formula{position:absolute;right:clamp(1.25rem,5vw,3.5rem);bottom:clamp(1.5rem,5vw,3rem);margin:0;font-family:var(--font-display);font-size:clamp(.85rem,1.6vw,1.05rem);letter-spacing:.08em;color:rgba(255,255,255,.28);animation:rise .9s var(--ease) .35s both}.hero-copy{position:relative;z-index:1;display:flex;flex-direction:column;justify-content:flex-end;max-width:44rem;padding:clamp(3rem,9vw,6.5rem) clamp(1.35rem,5vw,4rem) clamp(3.25rem,8vw,5.5rem);animation:rise .75s var(--ease) both}.hero-kicker{margin:0 0 1rem;font-size:.72rem;font-weight:500;letter-spacing:.16em;text-transform:uppercase;color:rgba(255,255,255,.5);animation:rise .7s var(--ease) .05s both}.hero-brand{font-size:clamp(5rem,16vw,9.5rem);font-weight:600;letter-spacing:-.04em;line-height:.86;margin:0 0 1.1rem;color:var(--white);animation:brandIn .95s var(--ease) both}.hero-brand,.hero-headline{font-family:var(--font-display)}.hero-headline{display:block;font-size:clamp(1.55rem,3.4vw,2.35rem);font-weight:500;letter-spacing:-.02em;line-height:1.2;margin:0 0 .85rem;color:rgba(255,255,255,.92);animation:rise .75s var(--ease) .12s both}.hero-lead{max-width:28rem;margin:0 0 2rem;font-size:1.05rem;line-height:1.6;color:rgba(255,255,255,.68);animation:rise .75s var(--ease) .18s both}.hero-actions{display:flex;flex-wrap:wrap;gap:.75rem;animation:rise .75s var(--ease) .24s both}.hero .btn{border-color:var(--white);background:var(--white);color:var(--black)}.hero .btn.secondary,.hero .btn:hover{background:transparent;color:var(--white)}.hero .btn.secondary{border-color:rgba(255,255,255,.55)}.hero .btn.secondary:hover{border-color:var(--white);background:rgba(255,255,255,.08)}.landing-section{max-width:var(--max);margin:0 auto;padding:4.5rem 1.5rem}.landing-section h2{font-size:clamp(1.6rem,3vw,2.1rem);margin-bottom:.75rem}.landing-section>p{max-width:34rem;color:var(--muted);margin-bottom:2rem}.landing-method{border-bottom:1px solid var(--line)}.landing-cta{padding-bottom:5rem}.landing-cta-actions{margin-top:.25rem}.feature-rows{display:grid;grid-gap:0;gap:0;border-top:1px solid var(--line)}.feature-row{display:grid;grid-template-columns:7rem 1fr;grid-gap:1.5rem;gap:1.5rem;padding:1.35rem 0;border-bottom:1px solid var(--line);animation:rise .6s var(--ease) both}.feature-row:nth-child(2){animation-delay:.08s}.feature-row:nth-child(3){animation-delay:.16s}.feature-index{font-family:var(--font-display);font-size:1.35rem;color:var(--muted-2)}.feature-row h3{margin-bottom:.35rem}.feature-row p{margin:0;color:var(--muted);max-width:36rem}@keyframes gridDrift{0%{transform:translateZ(0)}to{transform:translate3d(56px,56px,0)}}.course-meta{margin:0 0 .55rem;font-size:.72rem;letter-spacing:.1em;line-height:1.45;text-transform:uppercase;color:var(--muted);overflow-wrap:anywhere}.course-title{font-family:var(--font-display);font-size:1.35rem;font-weight:500;margin:0 0 .5rem}.locked-note{margin:.85rem 0 0;font-size:.88rem;color:var(--muted)}.stack{display:grid;grid-gap:1rem;gap:1rem}.block-type{display:inline-block;margin-bottom:.65rem;font-size:.68rem;font-weight:500;letter-spacing:.12em;text-transform:uppercase;color:var(--muted)}.content-md{white-space:normal;line-height:1.65}.content-md .katex-display{margin:.85rem 0;overflow-x:auto;overflow-y:hidden}.bubble-math .katex-display,.quiz-prompt .katex-display{margin:.5rem 0}.bubble-math{white-space:normal}@keyframes rise{0%{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}@keyframes brandIn{0%{opacity:0;transform:translateY(18px);letter-spacing:.12em}to{opacity:1;transform:translateY(0);letter-spacing:-.03em}}@keyframes fadeIn{0%{opacity:0}to{opacity:1}}@keyframes frameIn{0%{opacity:0;transform:scale(.96)}to{opacity:1;transform:scale(1)}}@keyframes progressIn{0%{transform:scaleX(.15);opacity:.4}to{transform:scaleX(1);opacity:1}}@media (prefers-reduced-motion:reduce){*,:after,:before{animation:none!important;transition:none!important}}.card{background:var(--white);border:1px solid var(--line);border-radius:var(--radius);padding:1.35rem 1.4rem}.site-footer{margin-top:auto;border-top:1px solid var(--line);background:transparent}.site-footer-inner{max-width:var(--max);margin:0 auto;padding:.85rem max(1.5rem,env(safe-area-inset-right)) max(.85rem,env(safe-area-inset-bottom)) max(1.5rem,env(safe-area-inset-left));display:flex;align-items:center;justify-content:space-between;gap:1rem;width:100%;box-sizing:border-box}.site-footer-meta{margin:0;display:flex;align-items:center;gap:.45rem;font-size:.72rem;letter-spacing:.06em;text-transform:uppercase;color:var(--muted-2)}.site-footer-brand-link{color:var(--muted);border-bottom:none;font-family:var(--font-display);font-size:.95rem;letter-spacing:.02em;text-transform:none}.site-footer-brand-link:hover{color:var(--ink);border-bottom:none}.site-footer-links{display:flex;flex-wrap:wrap;justify-content:flex-end;gap:.35rem 1rem}.site-footer-links a{font-size:.72rem;letter-spacing:.08em;text-transform:uppercase;color:var(--muted-2);border-bottom:none}.site-footer-links a:hover{color:var(--ink)}.flash{padding:.85rem 1rem;border:1px solid var(--line);margin-bottom:1rem;font-size:.92rem;animation:rise .35s var(--ease) both}.flash-ok{border-left:3px solid var(--black);background:#fafafa}.flash-warn{border-left:3px solid var(--muted);background:#f7f7f7}.flash-error{border-left:3px solid var(--muted-2);background:#f3f3f3}.meta-list{display:grid;grid-gap:.85rem;gap:.85rem;margin:0 0 1.25rem}.meta-list div{display:grid;grid-template-columns:7rem 1fr;grid-gap:.75rem;gap:.75rem;padding-bottom:.65rem;border-bottom:1px solid var(--line)}.meta-list dt{font-size:.72rem;letter-spacing:.1em;text-transform:uppercase;color:var(--muted)}.meta-list dd{margin:0}.access-list{list-style:none;margin:0;padding:0;display:grid;grid-gap:.35rem;gap:.35rem}.access-list li,.block-heading{display:flex;align-items:center;justify-content:space-between;gap:.75rem}.done-badge{font-size:.68rem;letter-spacing:.1em;text-transform:uppercase;color:var(--muted);border:1px solid var(--line);padding:.2rem .45rem}.lesson-pct{color:var(--muted);font-size:.82rem;margin-left:auto;margin-right:.65rem}.chat-form{display:flex;gap:.55rem;margin-top:.35rem}.admin-shortcuts{margin-top:2.5rem}.admin-shortcuts h2{margin-bottom:1rem}.status-pill{display:inline-block;font-size:.72rem;letter-spacing:.06em;text-transform:uppercase;padding:.2rem .45rem;border:1px solid var(--line)}.status-ready{border-color:var(--ink)}.status-failed{color:var(--muted)}.stack-tight{display:grid;grid-gap:.85rem;gap:.85rem}.stack-tight h2{margin-top:.75rem;font-size:1.15rem}.stack-tight ul{margin:0;padding-left:1.1rem;color:var(--muted)}.prose-page .panel li,.prose-page .panel p{max-width:42rem}textarea{width:100%;min-height:5rem;padding:.65rem .8rem;border:1px solid var(--line);border-radius:var(--radius);background:var(--white);color:var(--ink);font:inherit;resize:vertical}textarea:focus{outline:none;border-color:var(--ink)}.nav-account{font-weight:600!important}.course-card-top{display:flex;align-items:flex-start;justify-content:space-between;gap:.75rem;margin-bottom:.35rem}.course-price{margin:0;font-size:1.15rem;white-space:nowrap}.course-price,.course-price-lg{font-family:var(--font-display);font-weight:500}.course-price-lg{font-size:1.75rem}.course-card-desc{margin-bottom:.65rem;display:-webkit-box;-webkit-line-clamp:3;-webkit-box-orient:vertical;overflow:hidden}.course-card-stats{margin:0 0 1rem;font-size:.82rem}.course-hero-meta{display:grid;grid-template-columns:repeat(auto-fit,minmax(140px,1fr));grid-gap:1rem;gap:1rem;margin-top:1.35rem}.course-hero-meta .meta-label{display:block;margin-bottom:.35rem;font-size:.72rem;letter-spacing:.1em;text-transform:uppercase;color:var(--muted);font-weight:500}.course-about{margin-bottom:1.75rem}.course-about h2{margin-top:0}.syllabus-head{margin-bottom:1.5rem;padding-bottom:1rem;border-bottom:1px solid var(--line)}.syllabus-head h2{margin-bottom:.5rem}.syllabus-module-title{display:grid;grid-template-columns:3rem 1fr;grid-gap:.85rem;gap:.85rem;align-items:start;margin-bottom:.35rem}.syllabus-module-title h3{margin:0 0 .25rem;font-family:var(--font-display);font-size:1.25rem;font-weight:500}.lesson-preview{display:block;margin-top:.2rem;font-size:.85rem;font-weight:400;text-transform:none;letter-spacing:0}.lesson-locked{border-top:1px solid var(--line)}.lesson-locked-row{display:flex;align-items:flex-start;justify-content:space-between;gap:.75rem;padding:.85rem 0}.locked-tag{flex-shrink:0;font-size:.68rem;letter-spacing:.1em;text-transform:uppercase;color:var(--muted);border:1px solid var(--line);padding:.2rem .45rem;margin-top:.15rem}.purchase-panel{margin-top:2rem}.purchase-panel h2{margin-top:0}.purchase-price{color:var(--ink);font-weight:500}.purchase-hint{margin:.35rem 0 0;flex-basis:100%}.empty-state{padding:1.75rem 1.5rem;border:1px solid var(--line);background:var(--white)}.empty-state-title{margin:0 0 .45rem;font-family:var(--font-display);font-size:1.15rem;font-weight:500}.empty-state .muted{margin:0 0 1rem;max-width:36rem}.empty-state .form-actions{margin-top:0}.section-head{margin-bottom:1rem;padding-bottom:.85rem;border-bottom:1px solid var(--line)}.section-head h2{margin-bottom:.35rem}.section-head .muted{margin:0}.account-section{margin-bottom:2.5rem}.auth-footer-links{display:flex;flex-wrap:wrap;align-items:center;gap:.45rem}.receipt-main{max-width:560px}.receipt-ref{font-size:.85rem;word-break:break-all}[data-next-badge-root],[data-nextjs-toast],nextjs-portal{display:none!important}@media (max-width:860px){:root{--nav-h:3.5rem}body,html{background-attachment:scroll;overflow-x:clip}input,select,textarea{font-size:16px}main{padding:1.5rem max(1rem,env(safe-area-inset-right)) max(3rem,env(safe-area-inset-bottom)) max(1rem,env(safe-area-inset-left))}main.narrow{max-width:100%;padding-top:2.5rem}.hero{min-height:auto}.hero,.hero-backdrop{overflow:clip}.hero-grid{animation:none}.hero-copy{min-height:min(78dvh,560px);padding:2.75rem max(1.15rem,env(safe-area-inset-left)) max(2.5rem,env(safe-area-inset-bottom)) max(1.15rem,env(safe-area-inset-right));max-width:100%;min-width:0}.hero-brand{font-size:clamp(4rem,20vw,5.75rem);margin-bottom:.95rem}.hero-headline{font-size:clamp(1.35rem,6vw,1.75rem)}.hero-lead{font-size:.98rem;margin-bottom:1.5rem;max-width:100%}.hero-actions{flex-direction:column;align-items:stretch;width:100%}.hero-actions .btn{width:100%;min-height:48px}.hero-formula,.hero-orb-a,.hero-orb-b{display:none}.landing-section{padding:2.75rem max(1rem,env(safe-area-inset-right)) 3.25rem max(1rem,env(safe-area-inset-left))}.landing-section h2{font-size:clamp(1.35rem,5.5vw,1.65rem)}.feature-row{grid-template-columns:2.75rem 1fr;gap:.75rem;padding:1.1rem 0}.feature-row>div:last-child{min-width:0}.nav{position:-webkit-sticky;position:sticky;top:0;z-index:50;gap:.75rem;flex-wrap:nowrap;min-height:var(--nav-h);padding:max(.65rem,env(safe-area-inset-top)) max(1rem,env(safe-area-inset-right)) .65rem max(1rem,env(safe-area-inset-left))}.brand.brand-with-logo{min-width:0}.brand-logo-nav{width:2.75rem;height:2.75rem}.nav-toggle{display:inline-flex;margin-left:auto;z-index:2;min-width:44px;min-height:44px}.nav-links{position:absolute;top:100%;left:0;right:0;width:100%;margin-left:0;display:none;flex-direction:column;align-items:stretch;gap:0;padding:.25rem 0 max(.5rem,env(safe-area-inset-bottom));background:#ffffff;border-bottom:1px solid var(--line);box-shadow:0 16px 28px rgba(0,0,0,.1);z-index:60;max-height:calc(100dvh - var(--nav-h));overflow-y:auto;-webkit-overflow-scrolling:touch}.nav-links.is-open{display:flex}.nav-links .nav-signout,.nav-links .user-email,.nav-links a{display:flex;align-items:center;min-height:48px;padding:.85rem max(1.15rem,env(safe-area-inset-right)) .85rem max(1.15rem,env(safe-area-inset-left));border-bottom:1px solid var(--line);color:var(--ink)!important;background:#ffffff;font-size:.9rem;width:100%;text-align:left;box-sizing:border-box}.nav-links .user-email{overflow:hidden;text-overflow:ellipsis;white-space:nowrap;color:var(--muted)!important;text-transform:none;letter-spacing:0;font-weight:400}.nav-links a:after{display:none}.nav-links .nav-signout:last-child,.nav-links .user-email:last-child,.nav-links a:last-child{border-bottom:none}.nav-links a:active,.nav-links a:hover{background:#f5f5f5}.nav-signout{-webkit-appearance:none;-moz-appearance:none;appearance:none;border:0;cursor:pointer;font:inherit;font-weight:500;letter-spacing:.04em;text-transform:uppercase}.card,.panel{padding:1.1rem 1rem;min-width:0;max-width:100%}.grid{grid-template-columns:1fr}.course-card{max-width:100%}.catalog-list{min-width:0;width:100%}.catalog-row{grid-template-columns:1fr;gap:1rem;padding:1.25rem 1rem;align-items:stretch}.catalog-row-main{min-width:0}.catalog-row-main .course-title{font-size:clamp(1.2rem,5vw,1.4rem);overflow-wrap:anywhere}.catalog-row-aside{align-items:stretch;text-align:left;min-width:0;width:100%;gap:.75rem}.catalog-row-aside .course-price{font-size:1.35rem}.catalog-row-aside .form-actions{display:grid;grid-template-columns:1fr;justify-content:stretch;width:100%;grid-gap:.55rem;gap:.55rem}.catalog-row-aside .form-actions .btn{width:100%;min-height:48px}.stat-grid{grid-template-columns:1fr 1fr}.stat{border-right:none;min-width:0;padding:1.15rem 1rem}.stat:nth-child(odd){border-right:1px solid var(--line)}.stat-value{font-size:clamp(1.75rem,8vw,2.2rem)}.btn{min-height:48px;width:auto;padding:.8rem 1.15rem;letter-spacing:.06em}.form-actions{flex-direction:column;align-items:stretch;gap:.65rem}.form-actions .btn,.form-actions a.btn,.form-actions button.btn{width:100%;min-height:48px}.admin-shortcuts .form-actions{gap:.65rem}.purchase-panel .form-actions{margin-top:.85rem}.purchase-hint{margin-top:.15rem}.auth-panel .btn{width:100%;min-height:48px}.chat-form{flex-direction:column}.chat-form .btn{width:100%;min-height:48px}.chat-form input{min-height:48px}.table-wrap{width:100%;max-width:100%;overflow-x:auto;-webkit-overflow-scrolling:touch;border:1px solid var(--line);background:var(--white);overscroll-behavior-x:contain}.table-wrap table{border:none;min-width:560px}.table-wrap td,.table-wrap th{padding:.7rem .75rem;font-size:.9rem}.table-wrap .form-actions{min-width:8.5rem}.meta-list div{grid-template-columns:1fr;gap:.25rem}.access-list li,.site-footer-inner{flex-direction:column;align-items:flex-start}.site-footer-inner{padding:.75rem max(1rem,env(safe-area-inset-right)) max(.75rem,env(safe-area-inset-bottom)) max(1rem,env(safe-area-inset-left));gap:.65rem}.site-footer-links{justify-content:flex-start;width:100%;gap:.15rem .35rem}.site-footer-links a{display:inline-flex;align-items:center;min-height:44px;padding:.35rem .45rem}.auth-shell{padding:max(1.25rem,env(safe-area-inset-top)) max(.85rem,env(safe-area-inset-right)) max(1.25rem,env(safe-area-inset-bottom)) max(.85rem,env(safe-area-inset-left));align-items:flex-start}.auth-panel{width:100%;max-width:100%;padding:1.5rem 1.15rem 1.35rem}.lesson-list a{gap:.5rem;min-height:48px;flex-wrap:wrap;align-items:center;padding:.95rem 0}.lesson-pct{margin-right:.35rem;margin-left:auto}.lesson-locked-row{flex-wrap:wrap;align-items:flex-start;gap:.5rem}.syllabus-module-title{grid-template-columns:2.5rem 1fr;gap:.65rem}.block-heading{flex-wrap:wrap;gap:.5rem}.course-hero-meta{grid-template-columns:1fr 1fr;gap:.85rem}.course-hero-header h1{overflow-wrap:anywhere}.field-inline{flex-wrap:wrap}.empty-state{padding:1.35rem 1.1rem}.empty-state .form-actions .btn{width:100%}.page-header{margin-bottom:1.5rem}.page-header p{max-width:100%}h1{font-size:clamp(1.75rem,8vw,2.25rem)}h1,h2{overflow-wrap:anywhere}.bubble-math,.content-md,.quiz-prompt{overflow-x:auto;max-width:100%;-webkit-overflow-scrolling:touch}.bubble{max-width:100%}.chat{max-height:min(420px,50dvh)}iframe,video{width:100%;max-width:100%}.course-card-top{flex-direction:column;align-items:flex-start}.section-head{margin-bottom:.85rem}.account-section{margin-bottom:2rem}.receipt-ref{font-size:.8rem}.flash{overflow-wrap:anywhere}}@media (max-width:480px){main{padding:1.15rem max(.85rem,env(safe-area-inset-right)) 2.5rem max(.85rem,env(safe-area-inset-left))}.hero-copy{min-height:min(72dvh,520px);padding-top:2.25rem;padding-bottom:max(2rem,env(safe-area-inset-bottom))}.hero-brand{font-size:clamp(3.4rem,18vw,4.6rem)}.landing-section{padding:2.25rem max(.85rem,env(safe-area-inset-right)) 2.75rem max(.85rem,env(safe-area-inset-left))}.landing-cta{padding-bottom:3.5rem}.stat-grid{grid-template-columns:1fr}.stat{border-right:none!important}.stat:nth-child(odd){border-right:none}.stat-value{font-size:2rem}.feature-index{font-size:1.1rem}.feature-row{grid-template-columns:2.25rem 1fr;gap:.55rem}.eyebrow{font-size:.68rem;letter-spacing:.12em}.course-meta{font-size:.68rem;letter-spacing:.06em}.catalog-row{padding:1.1rem .85rem;gap:.85rem}.catalog-row-aside .course-price{font-size:1.25rem}.catalog-list{border-left:none;border-right:none;margin-left:-.85rem;margin-right:-.85rem;width:auto}.card,.panel{padding:1rem .85rem}.purchase-panel{margin-top:1.5rem}.course-hero-meta{grid-template-columns:1fr}.course-price-lg{font-size:1.45rem}.syllabus-module-title{grid-template-columns:1fr;gap:.25rem}.table-wrap table{min-width:480px}.table-wrap td,.table-wrap th{padding:.55rem .6rem;font-size:.82rem}.auth-panel{padding:1.25rem 1rem 1.15rem}.auth-panel h1{font-size:1.55rem}.site-footer-links{flex-direction:column;align-items:flex-start;gap:0}.site-footer-links a{width:100%}.admin-shortcuts{margin-top:1.75rem}.account-section{margin-bottom:1.75rem}.receipt-main{max-width:100%}.meta-list{gap:.65rem}.chat{max-height:340px}.btn{font-size:.78rem;letter-spacing:.05em;padding:.85rem 1rem}.module-block h2{font-size:1.15rem}.done-badge,.locked-tag,.status-pill{font-size:.64rem}}@media (max-width:860px) and (max-height:480px) and (orientation:landscape){.hero-copy{min-height:auto;padding-top:1.5rem;padding-bottom:1.5rem}.hero-brand{font-size:clamp(2.5rem,12vw,3.5rem)}.nav-links{max-height:calc(100dvh - 3rem)}}