html:has(.arth-page){overflow-x:clip}html:has(.arth-page) body{overflow-x:clip}.arth-nav-wrap{z-index:50;pointer-events:none;justify-content:center;padding:0 1rem;display:flex;position:fixed;top:.875rem;left:0;right:0}.arth-nav{pointer-events:auto;border-radius:var(--radius-pill);border:1px solid color-mix(in oklch, var(--color-rule) 60%, transparent);background:color-mix(in oklch, var(--color-paper) 85%, transparent);-webkit-backdrop-filter:blur(14px);align-items:center;gap:.5rem 1.25rem;padding:.5rem .5rem .5rem 1.1rem;display:flex;box-shadow:0 2px 16px #06000014,0 1px 2px #0600000f;box-shadow:0 2px 16px lab(.406719% 2.30754 .820211/.08),0 1px 2px lab(.406719% 2.30754 .820211/.06)}.arth-nav-wordmark{font-family:var(--font-display);letter-spacing:-.04em;color:var(--color-ink);white-space:nowrap;font-size:.95rem;font-weight:700;text-decoration:none}.arth-nav-spacer{flex:1;min-width:1rem}.arth-nav-cta{border-radius:var(--radius-pill);white-space:nowrap;background:var(--color-accent);color:var(--color-on-accent);border:1px solid var(--color-accent);justify-content:center;align-items:center;padding:.475rem 1.05rem;font-size:.85rem;font-weight:600;text-decoration:none;transition:background .15s,transform .1s;display:inline-flex}.arth-nav-cta:hover{background:var(--color-accent-hover);border-color:var(--color-accent-hover)}.arth-nav-cta:focus-visible{outline:2px solid var(--color-focus);outline-offset:2px}.arth-nav-cta:active{transform:translateY(1px)}.arth-btn{border-radius:var(--radius-pill);white-space:nowrap;cursor:pointer;border:1px solid #0000;justify-content:center;align-items:center;padding:.8rem 1.6rem;font-size:.95rem;font-weight:600;text-decoration:none;transition:background .15s,border-color .15s,transform .1s;display:inline-flex}.arth-btn:focus-visible{outline:2px solid var(--color-focus);outline-offset:2px}.arth-btn--primary{background:var(--color-accent);color:var(--color-on-accent);border-color:var(--color-accent)}.arth-btn--primary:hover{background:var(--color-accent-hover);border-color:var(--color-accent-hover)}.arth-btn--primary:active{transform:translateY(1px)}.arth-hero{text-align:center;flex-direction:column;justify-content:center;align-items:center;max-width:54rem;min-height:100dvh;margin:0 auto;padding:clamp(4rem,10vw,6rem) clamp(1.25rem,5vw,3rem);display:flex}.arth-hero-band{font-family:var(--font-label);letter-spacing:.14em;text-transform:uppercase;color:var(--color-neutral);align-items:center;gap:.65rem;margin-bottom:2rem;font-size:.65rem;font-weight:400;display:inline-flex}.arth-hero-band-br{display:none}@media (max-width:767px){.arth-hero-band-br{display:block}}.arth-hero-band-sq{color:#c0392b;font-size:.55rem;line-height:1}.arth-hero-title{font-size:var(--text-display);color:var(--color-ink);margin:0 0 1.35rem}.arth-hero-sub{color:var(--color-muted);max-width:36rem;margin:0 auto 2.25rem;font-size:clamp(1rem,2.2vw,1.125rem);line-height:1.7}.arth-hero-cta{flex-direction:column;align-items:center;gap:.25rem;display:flex}.arth-cta-disclaimer{color:var(--color-muted);letter-spacing:.02em;margin:.65rem 0;font-size:.72rem}.arth-features{padding:0 clamp(1.25rem, 5vw, 3rem) var(--section-gap);max-width:80rem;margin:0 auto}.arth-features-heading{font-size:var(--text-display-s);text-align:left;margin:0 0 2.5rem}.arth-features-grid{grid-template-columns:minmax(0,1fr);align-items:start;gap:2rem;display:grid}@media (min-width:768px){.arth-features-grid{grid-template-columns:minmax(0,1fr) minmax(0,1.2fr);gap:3.5rem}}.arth-features-nav{flex-direction:column;gap:0;display:flex}@media (min-width:768px){.arth-features-nav{scroll-snap-type:y mandatory;scrollbar-width:thin;scrollbar-color:var(--color-rule) transparent;max-height:min(72vh,34rem);padding-right:.25rem;scroll-padding:.5rem;overflow-y:auto}}.arth-feature-tab{scroll-snap-align:start;text-align:left;border:none;border-left:3px solid #0000;border-bottom:1px solid var(--color-border);cursor:pointer;background:0 0;width:100%;padding:1.15rem 1.25rem 1.15rem 1.35rem;transition:border-color .2s,background .2s;display:block}.arth-feature-tab:first-child{border-top:1px solid var(--color-border)}.arth-feature-tab:hover{background:color-mix(in oklch, var(--color-paper-2) 60%, transparent)}.arth-feature-tab:focus-visible{outline:2px solid var(--color-focus);outline-offset:-2px}.arth-feature-tab.is-active{border-left-color:var(--color-accent);background:color-mix(in oklch, var(--color-accent) 6%, var(--color-paper))}.arth-feature-tab-num{font-family:var(--font-label);letter-spacing:.12em;text-transform:uppercase;color:var(--color-accent-ink);opacity:.7;margin-bottom:.3rem;font-size:.65rem;display:block}.arth-feature-tab.is-active .arth-feature-tab-num{opacity:1}.arth-feature-tab-title{font-family:var(--font-display);letter-spacing:-.02em;color:var(--color-ink);margin:0 0 .3rem;font-size:1.05rem;font-weight:600;line-height:1.25;display:block}.arth-feature-tab-body{color:var(--color-muted);font-size:.875rem;line-height:1.55;display:block}.arth-features-visual{display:none}@media (min-width:768px){.arth-features-visual{display:block;position:sticky;top:5rem}}.arth-features-shots{width:100%;min-height:30rem;animation:.3s arth-shots-enter;position:relative}@keyframes arth-shots-enter{0%{opacity:0;transform:scale(.97)}to{opacity:1;transform:scale(1)}}.arth-shot-btn{border-radius:var(--radius-card);cursor:zoom-in;width:76%;box-shadow:var(--shadow-shot);border:none;border:1px solid color-mix(in oklch, var(--color-rule) 45%, transparent);background:0 0;padding:0;transition:transform .25s,box-shadow .25s,z-index;position:absolute;overflow:hidden}.arth-shot-btn:focus-visible{outline:2px solid var(--color-focus);outline-offset:3px}.arth-shot--back{z-index:1;transform-origin:100% 0;top:0;right:0;transform:rotate(2.5deg)}.arth-shot--front{z-index:2;transform-origin:0 100%;top:28%;left:0;transform:rotate(-2deg)}@media (hover:hover){.arth-shot--back:hover{z-index:10;transform:rotate(2.5deg)translateY(-10px)scale(1.04);box-shadow:0 32px 64px -16px #06000038,0 2px 4px #0600001f;box-shadow:0 32px 64px -16px lab(.406719% 2.30754 .820211/.22),0 2px 4px lab(.406719% 2.30754 .820211/.12)}.arth-shot--front:hover{z-index:10;transform:rotate(-2deg)translateY(-10px)scale(1.04);box-shadow:0 32px 64px -16px #06000038,0 2px 4px #0600001f;box-shadow:0 32px 64px -16px lab(.406719% 2.30754 .820211/.22),0 2px 4px lab(.406719% 2.30754 .820211/.12)}}.arth-shot-img{vertical-align:middle;width:100%;height:auto;display:block}.arth-mobile-carousel-wrap{margin-top:2rem;margin-left:calc(-1*clamp(1.25rem,5vw,3rem));margin-right:calc(-1*clamp(1.25rem,5vw,3rem))}@media (min-width:768px){.arth-mobile-carousel-wrap{display:none}}.arth-mobile-carousel{scroll-snap-type:x mandatory;-webkit-overflow-scrolling:touch;scrollbar-width:none;gap:.75rem;padding:.25rem clamp(1.25rem,5vw,3rem) 1rem;display:flex;overflow-x:auto}.arth-mobile-carousel::-webkit-scrollbar{display:none}.arth-carousel-slide{scroll-snap-align:start;flex-direction:column;flex:0 0 82%;gap:.5rem;display:flex}.arth-carousel-img-btn{border-radius:var(--radius-card);cursor:zoom-in;box-shadow:var(--shadow-shot);border:none;border:1px solid color-mix(in oklch, var(--color-rule) 45%, transparent);aspect-ratio:16/10;background:0 0;width:100%;padding:0;transition:transform .15s;display:block;overflow:hidden}.arth-carousel-img-btn:active{transform:scale(.98)}.arth-carousel-img{object-fit:cover;object-position:top left;width:100%;height:100%;display:block}.arth-carousel-label{font-family:var(--font-label);letter-spacing:.08em;text-transform:uppercase;color:var(--color-accent-ink);padding-left:.15rem;font-size:.68rem}.arth-carousel-hint{color:var(--color-neutral);text-align:center;margin-top:.25rem;padding-bottom:.5rem;font-size:.75rem}.arth-steps{padding:0 clamp(1.25rem, 5vw, 3rem) var(--section-gap);max-width:72rem;margin:0 auto}.arth-steps-heading{font-size:var(--text-display-s);text-align:center;margin:0 0 2rem}.arth-steps-grid{grid-template-columns:minmax(0,1fr);gap:1.25rem;display:grid}@media (min-width:640px){.arth-steps-grid{grid-template-columns:repeat(3,minmax(0,1fr));gap:1.5rem}}.arth-step-card{border-radius:var(--radius-card);border:1px solid var(--color-border);background:var(--color-paper);box-shadow:var(--shadow-card);flex-direction:column;padding:1.5rem 1.35rem;transition:transform .2s,box-shadow .2s;display:flex}@media (prefers-reduced-motion:no-preference){.arth-step-card:hover{transform:translateY(-3px);box-shadow:0 16px 40px -12px #06000024;box-shadow:0 16px 40px -12px lab(.406719% 2.30754 .820211/.14)}}.arth-step-icon{flex-shrink:0;width:3rem;height:3rem;margin-bottom:1.25rem}.arth-step-num{font-family:var(--font-label);letter-spacing:.1em;text-transform:uppercase;color:var(--color-accent-ink);margin:0 0 .4rem;font-size:.65rem}.arth-step-title{letter-spacing:-.02em;color:var(--color-ink);margin:0 0 .5rem;font-size:1rem;font-weight:600}.arth-step-body{color:var(--color-muted);flex:1;margin:0;font-size:.875rem;line-height:1.6}.arth-problem{grid-template-columns:minmax(0,1fr) minmax(0,1fr);display:grid}.arth-problem-left{background:var(--color-paper-2);justify-content:flex-end;align-items:center;padding:clamp(3.5rem,8vw,6rem) clamp(2rem,5vw,5rem);display:flex}.arth-problem-left-inner{width:100%;max-width:28rem;color:var(--color-muted);font-size:clamp(.95rem,1.8vw,1.05rem);line-height:1.75}.arth-problem-left-inner p{margin:0 0 .9rem}.arth-problem-left-inner p:last-child{margin-bottom:0}.arth-problem-right{background:color-mix(in oklch, var(--color-accent) 13%, var(--color-paper));justify-content:flex-start;align-items:center;padding:clamp(3.5rem,8vw,6rem) clamp(2rem,5vw,5rem);display:flex}.arth-problem-headline{color:var(--color-accent-ink);letter-spacing:-.03em;max-width:14ch;margin:0;font-size:clamp(2rem,4.5vw,3.25rem);font-weight:700;line-height:1.05}@media (max-width:767px){.arth-problem{grid-template-columns:1fr}.arth-problem-left{order:2;justify-content:flex-start}.arth-problem-right{order:1}}.arth-prefooter{text-align:center;background:color-mix(in oklch, var(--color-accent) 7%, var(--color-paper));border-top:1px solid color-mix(in oklch, var(--color-accent) 20%, var(--color-border));padding:clamp(3.5rem,10vw,6rem) clamp(1.25rem,5vw,3rem)}.arth-prefooter-title{font-size:var(--text-display-s);max-width:24ch;color:var(--color-ink);margin:0 auto 1rem}.arth-prefooter-sub{color:var(--color-muted);letter-spacing:.02em;margin:0;font-size:.8rem}.arth-prefooter-cta{margin-top:1.75rem}.arth-footer{text-align:center;max-width:48rem;margin:0 auto;padding:2.25rem clamp(1.25rem,5vw,3rem) 3rem}.arth-footer-made{color:var(--color-ink);margin:0 0 .35rem;font-size:.95rem}.arth-footer-credit{color:var(--color-muted);margin:0 0 1.5rem;font-size:.8rem}.arth-footer-attributions{color:var(--color-neutral);font-size:.6rem;line-height:1.6}.arth-footer-attributions a{color:inherit;text-underline-offset:2px;text-decoration:underline}.arth-footer-attributions a:hover{color:var(--color-muted)}.visually-hidden{clip:rect(0, 0, 0, 0);white-space:nowrap;border:0;width:1px;height:1px;margin:-1px;padding:0;position:absolute;overflow:hidden}@media (prefers-reduced-motion:reduce){.arth-shot-btn,.arth-step-card,.arth-btn,.arth-nav-cta,.arth-features-shots,.image-lightbox-backdrop{transition:none;animation:none}}