@import url("design-tokens.css");
:root{--bg:#09090c;--panel:#111116;--panel2:#18171e;--line:#302d37;--ink:#f7f5fa;--muted:#a6a1ad;--purple:#a970ff;--purple2:#7137bc;--acid:#d6ff45;--red:#ff686f;--amber:#ffc45c}
*{box-sizing:border-box}html{scroll-behavior:smooth}body{margin:0;background:var(--bg);color:var(--ink);font-family:Inter,ui-sans-serif,system-ui,-apple-system,"Segoe UI",sans-serif;font-size:16px;line-height:1.6}button,input,a{font:inherit}a{color:inherit;text-decoration:none}button{color:inherit}::selection{background:var(--purple);color:#08080a}:where(a,button,input,select,textarea,summary,[tabindex]):focus-visible{outline:3px solid #c89cff!important;outline-offset:4px!important}input[type="range"]{min-height:44px}.sr-only{position:absolute!important;width:1px!important;height:1px!important;padding:0!important;margin:-1px!important;overflow:hidden!important;clip:rect(0,0,0,0)!important;white-space:nowrap!important;border:0!important}@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto!important}*,*::before,*::after{animation-duration:.01ms!important;animation-iteration-count:1!important;transition-duration:.01ms!important;scroll-behavior:auto!important}}
.guide-topbar{position:sticky;top:0;z-index:20;display:flex;align-items:center;justify-content:space-between;gap:24px;height:72px;padding:0 clamp(18px,5vw,68px);border-bottom:1px solid var(--line);background:#09090ce8;backdrop-filter:blur(16px)}.guide-brand{display:flex;align-items:center;gap:12px;text-transform:uppercase;font-size:.82rem;letter-spacing:.05em}.guide-brand i{display:grid;place-items:center;width:36px;height:36px;background:var(--purple);color:#09090c;font-style:normal;font-size:.7rem;font-weight:950;transform:skew(-7deg)}.guide-brand b{color:var(--purple)}.guide-nav{display:flex;align-items:center;gap:22px;color:#d3cfd7;font-size:.82rem;font-weight:750}.guide-nav a:hover,.guide-nav a:focus-visible{color:var(--acid);outline:0}.guide-back{padding:9px 13px;border:1px solid var(--line);border-radius:999px}
.guide-main{overflow:hidden}.guide-hero{max-width:var(--max);margin:auto;padding:clamp(62px,9vw,120px) clamp(18px,5vw,54px) clamp(48px,7vw,84px)}.guide-kicker,.mini-label{margin:0 0 18px;color:var(--purple);font-size:.74rem;font-weight:900;letter-spacing:.17em;text-transform:uppercase}.guide-hero h1{max-width:1000px;margin:0;font-size:clamp(3.4rem,8vw,7.7rem);line-height:.86;letter-spacing:-.07em}.guide-hero h1 em{color:var(--purple);font-style:normal}.guide-lead{max-width:760px;margin:32px 0 0;color:#cac6cf;font-size:clamp(1.08rem,1.8vw,1.35rem);line-height:1.65}.guide-meta{display:flex;flex-wrap:wrap;gap:9px;margin-top:32px}.guide-meta span,.guide-meta a{padding:8px 12px;border:1px solid var(--line);border-radius:999px;color:#aaa5b0;font-size:.77rem;font-weight:800}.guide-meta a:hover{border-color:var(--purple);color:#fff}
.guide-workspace{max-width:var(--max);margin:0 auto;padding:0 clamp(18px,5vw,54px) clamp(80px,10vw,130px)}.lab-shell{display:grid;grid-template-columns:minmax(0,1.35fr) minmax(290px,.65fr);min-height:590px;border:1px solid var(--line);background:var(--panel);box-shadow:0 30px 90px #0007}.lab-visual{position:relative;min-width:0;min-height:590px;overflow:hidden;border-right:1px solid var(--line);background:radial-gradient(circle at 50% 42%,#2a1740,transparent 43%),linear-gradient(#15141a 1px,transparent 1px),linear-gradient(90deg,#15141a 1px,transparent 1px);background-size:auto,38px 38px,38px 38px}.lab-panel{display:flex;flex-direction:column;padding:clamp(28px,4vw,45px)}.lab-panel h2{margin:0 0 16px;font-size:clamp(2rem,3.5vw,3.7rem);line-height:.95;letter-spacing:-.05em}.lab-panel>p{margin:0;color:var(--muted)}.control-stack{display:grid;gap:24px;margin-top:34px}.control-row{display:grid;gap:9px}.control-row>span,.control-row label{display:flex;justify-content:space-between;gap:16px;color:#d7d3dc;font-size:.86rem;font-weight:800}.control-row output{color:var(--acid)}input[type=range]{width:100%;accent-color:var(--purple)}.toggle-row{display:flex;align-items:center;justify-content:space-between;gap:18px;padding:16px;border:1px solid var(--line);background:#0d0d11}.toggle-row input{width:22px;height:22px;accent-color:var(--purple)}.lab-status{margin-top:auto;padding:20px;border-left:4px solid var(--purple);background:#1b1622}.lab-status[data-level="safe"]{border-color:var(--acid)}.lab-status[data-level="warn"]{border-color:var(--amber)}.lab-status[data-level="stop"]{border-color:var(--red)}.lab-status span{color:var(--purple);font-size:.7rem;font-weight:900;letter-spacing:.13em}.lab-status h3{margin:8px 0 6px;font-size:1.35rem;line-height:1.1}.lab-status p{margin:0;color:#aaa5b0;font-size:.9rem}
.abs-machine{position:absolute;inset:0;display:grid;place-items:center}.wheel{position:absolute;width:min(36vw,270px);aspect-ratio:1;border:18px solid #6d6873;border-radius:50%;background:repeating-conic-gradient(#25232b 0 9deg,#0e0e12 9deg 18deg);box-shadow:inset 0 0 0 9px #111116,0 0 45px #0008;animation:wheelSpin 1.1s linear infinite}.wheel:before{content:"";position:absolute;inset:30%;border:8px solid #aaa5b0;border-radius:50%}.wheel:after{content:"";position:absolute;inset:45%;border-radius:50%;background:var(--purple);box-shadow:0 0 20px #a970ff88}.wheel.slow{animation-duration:2.3s}.wheel.locked{animation-play-state:paused;border-color:var(--red)}.wheel.modulating{animation:wheelPulse .22s ease-in-out infinite alternate}.sensor{position:absolute;left:calc(50% + min(18vw,135px));top:33%;display:grid;place-items:center;width:62px;height:40px;border:2px solid var(--acid);background:#121217;color:var(--acid);font-size:.68rem;font-weight:900}.sensor:after{content:"";position:absolute;width:34px;height:2px;right:100%;background:var(--acid);box-shadow:0 0 12px var(--acid)}.abs-module{position:absolute;left:9%;bottom:10%;width:165px;padding:18px;border:2px solid var(--purple);background:#121017;box-shadow:0 0 28px #a970ff33}.abs-module b,.abs-module small{display:block}.abs-module b{font-size:.82rem}.abs-module small{margin-top:5px;color:var(--muted);font-size:.68rem}.hydraulic-line{position:absolute;left:calc(9% + 165px);bottom:18%;width:31%;height:4px;background:linear-gradient(90deg,var(--purple),var(--acid));transform:rotate(-12deg);transform-origin:left;box-shadow:0 0 14px var(--purple)}.hydraulic-line.pulse{animation:linePulse .32s linear infinite}.surface{position:absolute;left:0;right:0;bottom:0;height:43px;background:repeating-linear-gradient(90deg,#292730 0 55px,#1d1b22 55px 110px)}.surface.wet{background:repeating-linear-gradient(110deg,#243442 0 3px,#151c24 3px 16px)}.abs-steps{display:grid;grid-template-columns:repeat(3,1fr);margin-top:24px;border:1px solid var(--line)}.abs-steps button{min-height:72px;padding:14px;border:0;border-right:1px solid var(--line);background:#111116;color:#aaa5b0;text-align:left;cursor:pointer}.abs-steps button:last-child{border-right:0}.abs-steps button.active{background:var(--purple);color:#09090c}.abs-explain{padding:20px;border:1px solid var(--line);border-top:0;color:#aaa5b0}.abs-explain b{display:block;margin-bottom:5px;color:#fff}@keyframes wheelSpin{to{transform:rotate(360deg)}}@keyframes wheelPulse{to{transform:rotate(8deg);filter:drop-shadow(0 0 16px var(--acid))}}@keyframes linePulse{50%{opacity:.35}} 
.engine-machine{position:absolute;inset:0}.cylinder-box{position:absolute;left:50%;top:70px;width:min(44vw,280px);height:380px;border:12px solid #57535f;border-bottom:0;transform:translateX(-50%);background:#17141d}.engine-piston{position:absolute;left:50%;top:245px;width:min(38vw,236px);height:72px;transform:translateX(-50%);background:linear-gradient(#cbc7d0,#64616c);transition:top .5s ease}.engine-piston:after{content:"";position:absolute;left:50%;top:66px;width:18px;height:180px;background:#87838e;transform:translateX(-50%) rotate(var(--rod-angle,-18deg));transform-origin:top}.engine-crank{position:absolute;left:50%;bottom:34px;width:110px;height:110px;border:16px solid #4e4b55;border-radius:50%;transform:translateX(-50%) rotate(var(--crank-angle,0deg));transition:transform .5s ease}.engine-spark{position:absolute;left:50%;top:105px;z-index:2;color:var(--acid);font-size:3.6rem;transform:translateX(-50%);opacity:0}.engine-spark.on{animation:sparkFlash .55s ease}.engine-valve{position:absolute;top:42px;width:12px;height:110px;background:#aaa5af;transition:transform .35s}.engine-valve:after{content:"";position:absolute;left:50%;bottom:0;width:42px;height:11px;background:#aaa5af;transform:translateX(-50%)}.engine-valve.in{left:calc(50% - 76px)}.engine-valve.out{left:calc(50% + 64px)}.engine-valve.open{transform:translateY(28px)}.engine-port{position:absolute;top:160px;padding:6px 9px;border:1px solid var(--purple);color:#c8a9ef;font-size:.7rem;font-weight:900}.engine-port.in{left:12%}.engine-port.out{right:12%}.engine-mixture{position:absolute;left:50%;top:150px;width:min(36vw,220px);height:160px;transform:translateX(-50%);background:radial-gradient(circle,#a970ff66 1.5px,transparent 2px);background-size:15px 15px;opacity:.75;transition:.4s}.engine-mixture.burn{background:radial-gradient(circle,#ffb34788 1.5px,transparent 2px);background-size:12px 12px}.engine-mixture.exhaust{background:radial-gradient(circle,#8f8a9580 1.5px,transparent 2px);background-size:17px 17px}.engine-mode{display:grid;grid-template-columns:1fr 1fr;margin-top:30px;border:1px solid var(--line)}.engine-mode button{padding:16px;border:0;background:#111116;color:#aaa5b0;cursor:pointer;font-weight:850}.engine-mode button+button{border-left:1px solid var(--line)}.engine-mode button.active{background:var(--purple);color:#09090c}.step-buttons{display:grid;grid-template-columns:repeat(4,1fr);gap:7px;margin-top:18px}.step-buttons button{min-height:48px;border:1px solid var(--line);background:#111116;cursor:pointer}.step-buttons button.active{border-color:var(--acid);color:var(--acid);background:#242a15}.play-button{width:100%;margin-top:8px;padding:13px;border:1px solid var(--purple);background:#1f1529;cursor:pointer;font-weight:850}.play-button:hover{background:var(--purple);color:#09090c}@keyframes sparkFlash{15%,60%{opacity:1;transform:translateX(-50%) scale(1.35)}100%{opacity:0}}
.compare-grid,.trust-grid,.link-grid{display:grid;grid-template-columns:repeat(3,1fr);border:1px solid var(--line);margin-top:28px}.compare-grid article,.trust-grid article,.link-grid a{min-height:220px;padding:28px;border-right:1px solid var(--line);background:#0e0e12}.compare-grid article:last-child,.trust-grid article:last-child,.link-grid a:last-child{border-right:0}.compare-grid span,.trust-grid span,.link-grid span{color:var(--purple);font-size:.7rem;font-weight:900;letter-spacing:.13em}.compare-grid h3,.trust-grid h3,.link-grid h3{margin:45px 0 11px;font-size:1.7rem;line-height:1}.compare-grid p,.trust-grid p,.link-grid p{margin:0;color:var(--muted);font-size:.92rem}.link-grid a{transition:.18s}.link-grid a:hover,.link-grid a:focus-visible{background:#181220;outline:0;transform:translateY(-4px)}
.diagnostic-shell{display:grid;grid-template-columns:260px 1fr;min-height:590px;border:1px solid var(--line);background:#111116}.diagnostic-trail{padding:28px;border-right:1px solid var(--line)}.diagnostic-trail span{color:var(--purple);font-size:.7rem;font-weight:900;letter-spacing:.14em}.diagnostic-trail ol{display:grid;gap:0;margin:25px 0 0;padding:0;list-style:none}.diagnostic-trail li{padding:15px 0;border-bottom:1px solid var(--line);color:#797480;font-size:.85rem}.diagnostic-trail li.current{color:#fff}.diagnostic-trail li.done{color:var(--acid)}.diagnostic-stage{padding:clamp(30px,5vw,65px);background:#f5f5f7;color:#171719}.diagnostic-stage>span{color:var(--purple2);font-size:.72rem;font-weight:900;letter-spacing:.14em}.diagnostic-stage h2{max-width:720px;margin:28px 0 16px;font-size:clamp(2.5rem,5.2vw,5.4rem);line-height:.92;letter-spacing:-.06em}.diagnostic-stage>p{max-width:700px;margin:0;color:#68646e}.diagnostic-choices{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin-top:34px}.diagnostic-choices button{min-height:78px;padding:16px;border:1px solid #d5d1d9;border-radius:12px;background:#fff;color:#29272e;text-align:left;cursor:pointer;font-weight:800}.diagnostic-choices button:hover,.diagnostic-choices button:focus-visible{border-color:var(--purple2);background:#f2eaff;outline:0}.diagnostic-result{padding:22px;border-left:4px solid var(--purple2);background:#ece8f1}.diagnostic-result h3{margin:8px 0;font-size:1.55rem}.diagnostic-result p{margin:0;color:#625d68}.diagnostic-result ul{margin:18px 0 0;padding-left:20px}.diagnostic-reset{margin-top:22px;padding:11px 15px;border:1px solid #c9c4cf;background:#fff;color:#333039;cursor:pointer;font-weight:800}
.editorial{max-width:var(--max);margin:auto;padding:clamp(65px,9vw,110px) clamp(18px,5vw,54px);border-top:1px solid var(--line)}.editorial-head{display:grid;grid-template-columns:.7fr 1.3fr 1fr;gap:30px;align-items:end;margin-bottom:45px}.editorial-head h2{margin:0;font-size:clamp(2.7rem,5.4vw,5.6rem);line-height:.9;letter-spacing:-.06em}.editorial-head>p:last-child{margin:0;color:var(--muted)}.source-list{display:flex;flex-wrap:wrap;gap:9px;margin-top:22px}.source-list a{padding:8px 11px;border:1px solid var(--line);border-radius:999px;color:#cbb8e5;font-size:.78rem;font-weight:800}.source-list a:hover{border-color:var(--purple);color:#fff}.safety-note{margin-top:28px;padding:22px;border-left:4px solid var(--amber);background:#17151a;color:#c8c3cc}.safety-note strong{color:#fff}.project-story{max-width:820px}.project-story h2{margin:0 0 20px;font-size:clamp(2.6rem,5.4vw,5.5rem);line-height:.92;letter-spacing:-.06em}.project-story p{color:#b8b3bf;font-size:1.05rem}.project-story blockquote{margin:34px 0;padding-left:24px;border-left:4px solid var(--purple);font-size:clamp(1.35rem,2.8vw,2.2rem);line-height:1.25;font-weight:800}
.project-thanks{scroll-margin-top:78px}.project-thanks-grid{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));border:1px solid var(--line)}.project-thanks-grid article{min-height:230px;padding:28px;display:flex;flex-direction:column;border-right:1px solid var(--line);border-bottom:1px solid var(--line);background:#0e0e12}.project-thanks-grid article:nth-child(3),.project-thanks-grid article:nth-child(5){border-right:0}.project-thanks-grid article:nth-last-child(-n+2){border-bottom:0}.project-thanks-grid .project-thanks-featured{grid-column:1/-1;min-height:195px;border-right:0;background:radial-gradient(circle at 90% 10%,#d055ff33,transparent 38%),#17131e;box-shadow:inset 4px 0 0 var(--acid)}.project-thanks-grid span{color:var(--purple);font-size:.72rem;font-weight:900;letter-spacing:.13em}.project-thanks-grid .project-thanks-featured span{color:var(--acid)}.project-thanks-grid h3{margin:auto 0 12px;font-size:clamp(1.7rem,3vw,3rem);line-height:1;letter-spacing:-.045em}.project-thanks-grid p,.project-thanks-signoff{margin:0;color:var(--muted);font-size:1rem;line-height:1.6}.project-thanks-signoff{margin-top:26px}
.guide-footer{display:grid;grid-template-columns:1fr 1fr auto;gap:35px;padding:48px clamp(18px,5vw,68px);border-top:1px solid var(--line);color:var(--muted);font-size:.82rem}.guide-footer b{color:var(--purple)}.guide-footer nav{display:flex;flex-wrap:wrap;gap:10px 20px}.guide-footer nav a:hover{color:var(--acid)}.guide-footer p{margin:0;max-width:420px}
.tool-page .guide-hero,body:has([data-diagnostic]) .guide-hero{padding:var(--section-space) var(--page-pad) clamp(36px,5vw,60px)}.tool-page .guide-hero h1,body:has([data-diagnostic]) .guide-hero h1{max-width:900px;font-size:var(--h1-size);line-height:1.02;letter-spacing:-.045em}.tool-page .guide-lead,body:has([data-diagnostic]) .guide-lead{max-width:var(--reading-max);margin-top:24px;font-size:var(--body-reading);line-height:1.6}.tool-page .guide-meta,body:has([data-diagnostic]) .guide-meta{gap:8px 18px;margin-top:22px;color:#aaa5b0;font-size:var(--text-secondary)}.tool-page .guide-meta span,.tool-page .guide-meta a,body:has([data-diagnostic]) .guide-meta span,body:has([data-diagnostic]) .guide-meta a{padding:0;border:0;border-radius:0;color:inherit;font-size:inherit;font-weight:650}.tool-page .guide-meta span+span:before,.tool-page .guide-meta a+span:before,.tool-page .guide-meta span+a:before,body:has([data-diagnostic]) .guide-meta span+span:before,body:has([data-diagnostic]) .guide-meta a+span:before,body:has([data-diagnostic]) .guide-meta span+a:before{content:'·';margin-right:18px;color:#625d69}.tool-page .guide-workspace,body:has([data-diagnostic]) .guide-workspace{padding-inline:var(--page-pad);padding-bottom:var(--section-space)}.guide-workspace[data-diagnostic]{display:flex;flex-direction:column}.guide-workspace[data-diagnostic]>.safety-note{order:-1;margin:0 0 20px}.diagnostic-stop-reminder{margin:auto 0 0;padding:18px 0 0;border-top:1px solid var(--line);color:#aaa5b0;font-size:.875rem;line-height:1.55}.diagnostic-stop-reminder strong{color:var(--amber)}
.tool-page .guide-kicker,.tool-page .mini-label,body:has([data-diagnostic]) .guide-kicker,body:has([data-diagnostic]) .mini-label{font-size:.875rem;letter-spacing:.04em;text-transform:none}.tool-page .guide-nav,body:has([data-diagnostic]) .guide-nav{font-size:.875rem}.tool-page .guide-nav a,body:has([data-diagnostic]) .guide-nav a{display:inline-flex;align-items:center;min-height:44px}.tool-page .control-row>span,.tool-page .control-row label,.tool-page .lab-status span,.tool-page .abs-steps button,.tool-page .abs-explain b,body:has([data-diagnostic]) .diagnostic-trail>span,body:has([data-diagnostic]) .diagnostic-trail li,body:has([data-diagnostic]) .diagnostic-stage>span{font-size:.875rem}.tool-page .source-list a,body:has([data-diagnostic]) .source-list a{display:inline-flex;align-items:center;min-height:44px;font-size:.875rem}.editorial-copy{max-width:var(--reading-max)}.editorial-copy h2{margin:0 0 18px;font-size:var(--h2-size);line-height:1.08;letter-spacing:-.035em}.editorial-copy p{margin:0;color:var(--muted);font-size:var(--body-reading);line-height:1.65}.process-editorial,.diagnostic-limits{padding-block:var(--section-space);padding-inline:var(--page-pad)}.process-list{max-width:var(--reading-max);margin:40px 0 0;padding:0;border-top:1px solid var(--line);list-style:none;counter-reset:process}.process-list li{display:grid;grid-template-columns:52px 1fr;gap:18px;padding:24px 0;border-bottom:1px solid var(--line);counter-increment:process}.process-list li:before{content:'0' counter(process);color:var(--purple);font-size:.875rem;font-weight:850}.process-list h3{margin:0 0 7px;font-size:var(--h3-size);line-height:1.2}.process-list p{margin:0;color:var(--muted);font-size:1rem;line-height:1.6}
@media(max-width:850px){.lab-shell,.diagnostic-shell{grid-template-columns:1fr}.lab-visual{border-right:0;border-bottom:1px solid var(--line);min-height:520px}.diagnostic-trail{border-right:0;border-bottom:1px solid var(--line)}.diagnostic-trail ol{display:flex;overflow-x:auto}.diagnostic-trail li{flex:0 0 160px;border-right:1px solid var(--line);padding:14px}.editorial-head{grid-template-columns:1fr 1.4fr}.editorial-head>p:last-child{grid-column:2}.guide-footer{grid-template-columns:1fr 1fr}.guide-footer>p:last-child{grid-column:1/-1}}
@media(max-width:650px){.guide-topbar{height:62px}.guide-brand span{display:none}.guide-back{font-size:.875rem;min-height:44px;display:inline-flex;align-items:center}.guide-hero h1{font-size:clamp(3rem,15vw,4.8rem)}.tool-page .guide-hero h1,body:has([data-diagnostic]) .guide-hero h1{font-size:var(--h1-size)}.guide-lead{font-size:1.05rem}.tool-page .guide-meta,body:has([data-diagnostic]) .guide-meta{display:grid;gap:7px}.tool-page .guide-meta span+span:before,.tool-page .guide-meta a+span:before,.tool-page .guide-meta span+a:before,body:has([data-diagnostic]) .guide-meta span+span:before,body:has([data-diagnostic]) .guide-meta a+span:before,body:has([data-diagnostic]) .guide-meta span+a:before{content:none}.tool-page [data-abs-lab] .lab-shell{display:flex;flex-direction:column}.tool-page [data-abs-lab] .lab-panel{order:1;padding:24px 20px}.tool-page [data-abs-lab] .control-stack{gap:18px;margin-top:26px}.tool-page [data-abs-lab] .lab-status{margin-top:24px}.tool-page [data-abs-lab] .lab-visual{order:2;min-height:330px;border-top:1px solid var(--line);border-bottom:0}.tool-page [data-abs-lab] .wheel{width:190px}.tool-page [data-abs-lab] .sensor{left:calc(50% + 78px)}.tool-page [data-abs-lab] .abs-module{left:12px;bottom:42px;width:128px}.tool-page [data-abs-lab] .hydraulic-line{left:140px;bottom:92px;width:31%}.compare-grid,.trust-grid,.link-grid{grid-template-columns:1fr}.compare-grid article,.trust-grid article,.link-grid a{min-height:180px;border-right:0;border-bottom:1px solid var(--line)}.compare-grid article:last-child,.trust-grid article:last-child,.link-grid a:last-child{border-bottom:0}.project-thanks-grid{grid-template-columns:1fr}.project-thanks-grid article,.project-thanks-grid article:nth-child(3),.project-thanks-grid article:nth-child(5){grid-column:auto;min-height:190px;border-right:0;border-bottom:1px solid var(--line)}.project-thanks-grid article:last-child{border-bottom:0}.diagnostic-choices{grid-template-columns:1fr}.diagnostic-stop-reminder{margin-top:18px}.editorial-head{grid-template-columns:1fr}.editorial-head>p:last-child{grid-column:1}.guide-footer{grid-template-columns:1fr}.guide-footer>p:last-child{grid-column:auto}.cylinder-box{width:230px}.engine-piston{width:198px}.step-buttons{grid-template-columns:repeat(2,1fr)}}
@media(max-width:650px){.lab-visual{min-height:440px}.tool-page [data-abs-lab] .lab-visual{min-height:330px}}
@media(prefers-reduced-motion:reduce){html{scroll-behavior:auto}*,*:before,*:after{animation-duration:.01ms!important;transition-duration:.01ms!important}}

/* Global navigation and local path context */
.guide-brand{flex:0 0 auto}.guide-nav{min-width:0;overflow-x:auto;white-space:nowrap;gap:18px}.guide-nav a{display:inline-flex!important;align-items:center;min-height:44px}.guide-nav a[aria-current="page"]{color:#fff;border-bottom:2px solid var(--purple)}
.guide-breadcrumb{max-width:var(--max);margin:0 auto;padding:20px clamp(18px,5vw,54px) 0;color:#8f8996;font-size:.875rem}.guide-breadcrumb ol{display:flex;flex-wrap:wrap;gap:8px;margin:0;padding:0;list-style:none}.guide-breadcrumb li+li:before{content:'→';margin-right:8px;color:#5f5966}.guide-breadcrumb a:hover{color:var(--acid)}
@media(max-width:850px){.guide-topbar{gap:14px;padding-inline:18px}.guide-brand span{display:none}.guide-nav{gap:14px}}
@media(max-width:650px){.guide-nav{overflow:visible;white-space:normal}}

/* Reading guides: one technical decision at a time. */
.reading-guide .guide-hero{padding-top:clamp(44px,7vw,84px)}
.reading-guide .guide-hero h1{max-width:920px;font-size:clamp(2.65rem,6.2vw,5.7rem);line-height:.98;letter-spacing:-.055em}
.reading-guide .guide-lead{max-width:760px;font-size:clamp(1.1rem,1.8vw,1.3rem)}
.lesson-section{max-width:var(--max);margin:auto;padding:clamp(52px,7vw,84px) var(--page-pad);border-top:1px solid var(--line)}
.lesson-copy{max-width:var(--reading-max)}
.lesson-copy>h2{margin:0 0 18px;font-size:clamp(1.9rem,4vw,3.35rem);line-height:1.08;letter-spacing:-.04em}
.lesson-copy>p,.lesson-copy>ul,.lesson-copy>ol{color:#c0bbc5;font-size:var(--body-reading);line-height:1.68}
.lesson-copy>p{margin:0 0 18px}.lesson-copy>p:last-child{margin-bottom:0}
.lesson-copy strong{color:#fff}.lesson-copy a{text-decoration:underline;text-decoration-color:#764da8;text-underline-offset:4px}
.mental-model{max-width:var(--reading-max);margin:30px 0 0;padding:0;border-top:1px solid var(--line);list-style:none;counter-reset:model}
.mental-model li{display:grid;grid-template-columns:48px 1fr;gap:18px;padding:22px 0;border-bottom:1px solid var(--line);counter-increment:model}
.mental-model li:before{content:'0' counter(model);color:var(--purple);font-weight:850}
.mental-model h3{margin:0 0 6px;font-size:var(--h3-size)}.mental-model p{margin:0;color:var(--muted);font-size:1rem;line-height:1.6}
.marking-reader{display:grid;grid-template-columns:repeat(7,minmax(0,1fr));max-width:1000px;margin:34px 0 0;border:1px solid var(--line);background:var(--panel)}
.marking-part{min-width:0;padding:22px 14px;border-right:1px solid var(--line)}.marking-part:last-child{border-right:0}
.marking-part dt{margin:0 0 14px;color:#fff;font-size:clamp(1.5rem,3vw,2.45rem);font-weight:900;line-height:1;letter-spacing:-.04em}
.marking-part dd{margin:0;color:var(--muted);font-size:.9rem;line-height:1.5}.marking-part dd strong{display:block;color:var(--acid);font-size:.76rem;letter-spacing:.04em;text-transform:uppercase}
.plain-table{width:100%;max-width:760px;margin:28px 0 0;border-collapse:collapse;font-size:1rem}.plain-table th,.plain-table td{padding:15px 12px;border-bottom:1px solid var(--line);text-align:left}.plain-table th{color:#fff}.plain-table td{color:var(--muted)}
.guide-callout{max-width:var(--reading-max);margin:30px 0 0;padding:22px 24px;border-left:4px solid var(--purple);background:#15121a;color:#c4bec9;font-size:1rem;line-height:1.65}.guide-callout strong{color:#fff}.guide-callout.warning{border-left-color:var(--amber)}
.check-list{max-width:var(--reading-max);margin:28px 0 0;padding:0;list-style:none;border-top:1px solid var(--line)}.check-list li{padding:19px 0 19px 34px;border-bottom:1px solid var(--line);color:#c4bec9;position:relative}.check-list li:before{content:'✓';position:absolute;left:0;color:var(--acid);font-weight:900}
.reading-sources{max-width:var(--reading-max);display:grid;gap:12px}.reading-sources a{display:flex;justify-content:space-between;gap:20px;min-height:52px;padding:14px 0;border-bottom:1px solid var(--line);color:#d9c9ee}.reading-sources a:hover{color:#fff}.reading-sources a span{color:var(--muted)}
.guide-pagination{max-width:var(--max);margin:auto;padding:36px var(--page-pad) 64px;border-top:1px solid var(--line);display:flex;justify-content:space-between;gap:20px}.guide-pagination a{display:inline-flex;align-items:center;min-height:44px;color:#d9c9ee;font-weight:750}.guide-pagination a:hover{color:var(--acid)}
@media(max-width:850px){.marking-reader{grid-template-columns:repeat(2,minmax(0,1fr))}.marking-part{border-bottom:1px solid var(--line)}.marking-part:nth-child(even){border-right:0}.marking-part:last-child{grid-column:1/-1;border-bottom:0}}
@media(max-width:520px){.mental-model li{grid-template-columns:36px 1fr}.marking-reader{grid-template-columns:1fr}.marking-part,.marking-part:nth-child(even){border-right:0}.marking-part:last-child{grid-column:auto}.guide-pagination{display:grid}.reading-sources a{display:grid;gap:4px}}

/* Shared five-destination primary navigation. */
.primary-navigation{position:relative;flex:0 0 auto;z-index:25}
.primary-navigation>summary{display:none;list-style:none;cursor:pointer;user-select:none}
.primary-navigation>summary::-webkit-details-marker{display:none}
.primary-navigation :where(summary,a):focus-visible{outline:3px solid #c89cff;outline-offset:3px}
@media(max-width:720px){
 .primary-navigation{margin-left:auto}
 .primary-navigation>summary{display:inline-flex;min-width:72px;min-height:44px;align-items:center;justify-content:center;padding:0 14px;border:1px solid var(--line);background:var(--panel);color:var(--ink);font-size:.875rem;font-weight:750}
 .primary-navigation:not([open])>nav{display:none!important}
 .primary-navigation[open]>nav{position:absolute;top:calc(100% + 8px);right:0;display:flex!important;flex-direction:column;align-items:stretch;gap:2px;width:max-content;min-width:220px;max-width:calc(100vw - 32px);max-height:70vh;overflow:auto;padding:8px;border:1px solid var(--line);background:var(--panel);z-index:30;white-space:normal}
 .primary-navigation>nav a{display:flex!important;flex:0 0 auto;min-height:48px;align-items:center;justify-content:flex-start;padding:10px 12px;text-align:left;white-space:normal}
}