/* Phone composition: shared rhythm, thumb-level controls, editorial cards.
   Desktop layouts remain owned by their page stylesheets. */
@media screen and (max-width:767px){
  :root{--gutter:20px;--content-gutter:20px;--mobile-bottom:calc(20px + env(safe-area-inset-bottom));--mobile-reading:1.45}
  html{scroll-padding-top:88px;scrollbar-gutter:auto}
  .announcement{height:auto;min-height:64px;padding:14px 16px 14px 20px;font-size:14px;line-height:1.4}
  .announcement-close{width:40px;height:40px;padding:10px}
  .site-header{inset:0 auto auto;width:100%;height:0;padding:0;border-radius:0}
  .site-header>.brand{top:20px;left:20px}
  .site-header>.language-switch{top:17px;right:20px}
  .site-header-surface::before{inset:0 0 auto;height:72px;border-radius:0;box-shadow:none}
  .site-nav-shell{position:fixed;inset:auto 20px var(--mobile-bottom);height:44px}
  .site-nav{position:static;width:100%;height:44px;justify-content:space-between;flex-direction:row-reverse;pointer-events:none}
  .site-nav>*{pointer-events:auto}
  .site-nav>.outline-button{height:44px;min-height:44px;width:auto;min-width:108px;padding:8px 12px;font-size:16px}
  .site-nav .icon-group{flex-direction:row-reverse}
  .site-nav .icon-button{width:44px;height:44px;min-height:44px;flex-basis:44px}
  .site-nav .icon-group>.icon-button+.icon-button{margin-left:0;margin-right:-1px}

  /* The open menu keeps the same control positions as the page. */
  .fullscreen-dialog{height:100dvh;scroll-padding-block:90px 110px}
  .fullscreen-dialog[open]{animation-name:backdrop-appear;translate:none}
  .fullscreen-dialog .dialog-header{position:sticky;top:0;z-index:5;height:72px;padding:20px;align-items:flex-start;background:var(--dark)}
  .fullscreen-dialog .dialog-header .brand{min-height:34px}
  .fullscreen-dialog .dialog-header .header-actions{position:fixed;inset:auto 20px var(--mobile-bottom);display:flex;justify-content:space-between;flex-direction:row-reverse;gap:16px;pointer-events:none}
  .fullscreen-dialog .dialog-header .header-actions>*{pointer-events:auto}
  .fullscreen-dialog .dialog-header .outline-button{width:auto;min-width:108px;min-height:44px;height:44px;padding:8px 12px;font-size:16px;background:var(--dark);color:#fff;border:1px solid #eee}
  .fullscreen-dialog .dialog-header .icon-group{flex-direction:row-reverse}
  .fullscreen-dialog .dialog-header .icon-button{width:44px;height:44px;flex-basis:44px}
  .fullscreen-dialog .dialog-header .icon-group>.icon-button+.icon-button{margin-left:0;margin-right:-1px;border-left:1px solid #202020}
  .fullscreen-dialog .menu-grid{display:grid;grid-template-columns:minmax(0,1fr);gap:40px;padding:18px 40px 120px}
  .fullscreen-dialog .menu-grid>nav,.fullscreen-dialog .menu-discover{border-top:1px solid #aaa;padding-top:20px}
  .fullscreen-dialog .menu-grid .dialog-kicker{font-size:12px;line-height:1.4;letter-spacing:.03em;margin-bottom:16px}
  .fullscreen-dialog .menu-grid>nav>a,.fullscreen-dialog .menu-grid>nav>button{display:block;width:100%;font-size:20px;line-height:26px;margin:0;padding:10px 0}
  .fullscreen-dialog .menu-discover{display:block}
  .fullscreen-dialog .editorial-cards{grid-template-columns:minmax(0,1fr);gap:32px}
  .fullscreen-dialog .editorial-cards :is(img,video,.menu-method-animation){height:auto;aspect-ratio:16/9;width:100%;object-fit:cover}
  .fullscreen-dialog .editorial-cards h3{font-size:20px;line-height:1.2}
  .fullscreen-dialog .editorial-cards p{font-size:16px;line-height:1.4;margin-top:10px}
  .fullscreen-dialog .editorial-cards span{margin-top:12px;padding-block:8px}
  .fullscreen-dialog .menu-about{display:none}
  .fullscreen-dialog .search-content{margin:48px 20px 120px}
  .search-content input{height:48px;font-size:16px}
  .popular-searches>button{min-height:44px}
  .contact-dialog,.letter-page .contact-dialog{width:100%;max-width:none}
  .contact-panel,.letter-page .contact-panel{padding:90px 24px calc(40px + env(safe-area-inset-bottom))}
  .contact-panel>.dialog-kicker{margin-bottom:32px}
  .contact-panel>h2{font-size:32px;line-height:1.12;margin-bottom:40px}
  .contact-close{top:20px;left:12px;min-width:44px;min-height:44px}
  .form-row input{min-height:44px}

  /* The opening cue is clear of the fixed mobile controls. */
  .hero{height:calc(100svh - var(--banner-offset,64px));min-height:580px;max-height:none}
  .hero-media{min-height:580px}
  .hero-title{height:73%;padding:64px 24px 0}
  .hero h1{font-size:clamp(30px,8.6vw,44px);line-height:1.08;letter-spacing:-.035em;max-width:22ch;text-wrap:balance}
  .scroll-cue{bottom:clamp(118px,19svh,170px);gap:20px;font-size:16px}
  .featured{padding:60px 0 52px}
  .featured-nav{gap:16px;margin:0 20px 28px}
  .featured-topics{overflow:visible}
  .audience-tabs{gap:12px;flex:1;justify-content:space-between}
  .audience-tabs button{min-height:44px;padding:8px 0;background:transparent;font-size:17px;line-height:24px;border-radius:0;color:#777}
  .audience-tabs button[aria-selected=true]{background:transparent;color:#202020;box-shadow:inset 0 -1px currentColor}
  .all-expertise{min-height:44px;min-width:72px;font-size:12px;padding:8px}
  .carousel{gap:12px;padding-inline:20px;scroll-padding-inline:20px;align-items:stretch}
  .feature-slide{flex:0 0 calc(100% - 12px);height:auto;min-height:0;overflow:visible;background:transparent;border-radius:0;scroll-snap-align:start}
  .feature-image{height:auto;width:100%;aspect-ratio:1.1;object-fit:cover;border-radius:3px}
  .feature-caption{position:static;inset:auto;width:100%;background:transparent;color:#202020;padding:22px 10px 0;text-align:center}
  .feature-caption>p:first-child{font-size:14px;line-height:1.4;margin-bottom:12px;color:#747474}
  .feature-caption h2,html[lang=en] .feature-caption h2{font-size:24px;line-height:1.15;letter-spacing:-.025em;margin-inline:auto;max-width:23ch;text-wrap:balance}
  .carousel-controls{position:relative;inset:auto;display:flex;justify-content:center;gap:24px;padding:0;margin:24px 0 0;opacity:1;translate:none;transform:none}
  .carousel-controls .icon-button{flex-basis:48px;width:48px;height:44px;background:transparent;backdrop-filter:none;-webkit-backdrop-filter:none;pointer-events:auto;border:0}
  .carousel-controls .icon-button img{filter:brightness(0);width:28px;height:24px}
  .statement{padding:76px 20px 64px}
  .statement h2{font-size:clamp(28px,8.2vw,40px);line-height:1.12;letter-spacing:-.035em}
  .expertise{padding:12px 20px 52px}
  .expertise>.section-kicker{margin-bottom:24px;font-size:18px}
  .expertise-row{gap:18px;padding:24px 0 32px;border-color:#ddd}
  .expertise-heading{flex-direction:row;align-items:flex-end;gap:16px}
  .expertise-heading h3{font-size:clamp(38px,11.5vw,58px);line-height:1.02;letter-spacing:-.045em}
  .expertise-heading>.expertise-number{align-self:flex-start;font-size:14px;padding-top:4px}
  .expertise-copy p{font-size:18px;line-height:1.3;max-width:30ch}
  .duplex{gap:8px;padding-block:24px}
  .duplex>.zero-one-reveal{height:260px}
  .duplex>img{height:auto;aspect-ratio:4/3}
  .duplex>div{padding:42px 24px;gap:26px}
  .duplex h2{font-size:32px;line-height:1.06;letter-spacing:-.025em;max-width:15ch}
  .duplex>div>p{font-size:18px;line-height:1.4;padding:0;max-width:29ch}
  .duplex .outline-button{min-height:44px;font-size:14px}
  .principles{padding-top:64px;padding-bottom:64px}
  .principle{flex-basis:calc(100% - 32px);min-height:330px;padding:24px}
  .principle-list{gap:12px;margin-top:32px;scrollbar-width:none}
  .principle p{font-size:20px;line-height:1.3}
  .footer,.letter-site-footer{grid-template-columns:1fr 1fr;gap:36px 24px;padding:48px 20px calc(112px + env(safe-area-inset-bottom));font-size:16px}
  .footer .footer-wordmark{margin-bottom:8px}
  .footer .footer-brand{grid-column:1/-1}
  .footer h2,.letter-site-footer h2{font-size:12px;line-height:1.4;margin-bottom:14px}
  .footer>div:not(.footer-brand) a,.footer .text-button{min-height:40px;display:flex;align-items:center;margin:0;font-size:16px;line-height:1.35}
  .footer-social{display:flex;max-width:none;gap:12px}
  .footer .footer-social a{width:152px;height:44px;margin:0;font-size:14px}
  .footer-address,.footer .footer-email{font-size:14px;line-height:1.5}
  .footer>div:not(.footer-brand) .footer-email{font-size:14px}

  /* Editorial pages use a single readable measure on small screens. */
  .about-layout,.impact-detail-page .impact-layout{grid-template-columns:20px minmax(0,1fr) 20px}
  .impact-hero-copy,.impact-details,.impact-spotlight-media,.impact-case-copy,.impact-case-copy-right,.impact-performance-intro,.impact-case-contact>div{grid-column:1/-1}
  .about-intro-copy,.about-row-copy,.about-future-copy,.letter-reading{grid-column:3/-1}
  .about-intro,.impact-detail-page .impact-study-intro{margin-top:64px}
  .about-section-title,.impact-hero h1,.impact-section-title,.letter-heading h1{font-size:clamp(34px,9vw,46px);line-height:1.1;letter-spacing:-.025em;max-width:none}
  .about-row>h3{font-size:32px;line-height:1.1;letter-spacing:-.025em}
  .about-row{row-gap:28px}
  .about-lead{font-size:22px;line-height:1.3}
  .about-secondary,.about-row-copy>.about-lead{font-size:18px;line-height:1.4}
  .about-intro-copy>p:not(.about-lead):not(.about-secondary),.about-row-details>p,.about-future-copy>p:not(.about-lead):not(.about-secondary){font-size:18px;line-height:1.45}
  .about-link,.impact-link{min-height:44px;font-size:18px;line-height:1.35}
  .about-hero{row-gap:28px;min-height:calc(100svh - var(--about-banner-height,64px));padding:112px 20px calc(108px + env(safe-area-inset-bottom))}
  .about-hero h1{font-size:clamp(32px,8.7vw,48px);line-height:1.08}
  .about-hero-facts{gap:20px}
  .about-hero-facts dt,.about-hero-facts dd{font-size:12px;line-height:1.3}
  .about-hero-explore{min-height:44px;font-size:14px;margin-top:24px}
  .impact-study-hero{padding-top:calc(100px + 50vw);row-gap:24px}
  .impact-study-hero h1{font-size:clamp(30px,8.2vw,44px);line-height:1.1;max-width:24ch}
  .impact-study-hero .about-hero-mark svg{width:clamp(150px,43vw,220px)}
  .impact-hero-copy{margin-top:32px;font-size:22px;line-height:1.3}
  .impact-hero{padding-bottom:48px}
  .impact-details{margin-top:32px}
  .impact-spotlight-media{margin-top:32px}
  .impact-spotlight-lead{font-size:28px;line-height:1.2}
  .impact-story-grid{gap:48px}
  .impact-story h3{font-size:18px;line-height:1.3;margin-bottom:16px}
  .impact-story>p,.impact-caption{font-size:16px;line-height:1.5}
  .impact-chronicle-heading h2,.impact-chronicle-chapter>h2,.impact-chronicle-work>h2{font-size:32px;line-height:1.12;text-wrap:pretty}
  .impact-study .impact-case-copy{font-size:17px;line-height:1.55}
  .impact-study-opening{font-size:26px;line-height:1.25}
  .impact-closing,.impact-performance-credit{margin-left:0}
  .letter-reading-grid{padding-top:24px}
  .letter-body{font-size:18px;line-height:1.5}
  .letter-heading{padding-bottom:48px}

  /* Keep the one-line method masthead, with a calmer vertical rhythm. */
  .chain-page{padding:20px 20px 0}
  .chain-hero{min-height:440px;gap:32px;padding:20px 0 32px}
  .chain-hero-content{flex:1;justify-content:center;gap:28px}
  .chain-hero h1{font-size:clamp(28px,9.5vw,68px);gap:clamp(6px,1.8vw,14px)}
  .chain-hero h1 .chain-monogram{width:clamp(44px,15vw,104px)}
  .chain-section-heading{padding:56px 24px}
  .chain-kicker{font-size:12px;line-height:1.3}
  .chain-heading{font-size:28px;line-height:1.12}
  .chain-intro-copy{padding:32px 24px;min-height:360px;gap:36px}
  .chain-intro-copy>p{margin-top:0;font-size:17px;line-height:1.4}
  .chain-engine{padding:28px 24px;gap:44px}
  .chain-engine h3{font-size:24px;line-height:1.1}
  .chain-engine>p{font-size:17px;line-height:1.35}
  .chain-engine-symbol{top:30px;right:24px}
  .chain-beliefs>div{padding:36px 24px;gap:24px}
  .chain-operations{height:185svh}
  .chain-operations-sticky{height:100svh;min-height:0;padding:40px 16px 28px}
  .chain-operations .chain-heading{font-size:26px;max-width:22ch}
  .chain-equation{gap:6px;max-width:100%}
  .chain-equation>span{font-size:12px;padding:10px 8px}
  .chain-cycle-arrow{width:16px}
  .chain-detail-card{padding:24px}
  .chain-card-image{margin-bottom:28px;border-radius:3px}
  .chain-card-intro,.chain-steps details>p{font-size:17px;line-height:1.4}
  .chain-steps summary{padding:18px 0;min-height:56px;font-size:18px;gap:16px}
  .chain-summary,.chain-quote{padding:56px 24px}
  .chain-summary h2,.chain-quote blockquote{font-size:28px;line-height:1.15}
  .chain-transfer-grid article{padding:32px 24px;min-height:250px}
  .chain-transfer-grid ul{font-size:17px;line-height:1.4}
  .chain-footer p,.chain-footer nav,.chain-quote>p{font-size:12px}
  .chain-footer{padding:44px 0;gap:24px}

  .careers-page{--content-gutter:20px;--nav-gutter:20px}
  .careers-subnav{top:70px;padding-bottom:18px;gap:24px;scroll-padding-inline:20px}
  .careers-subnav a{min-height:40px;display:flex;align-items:center}
  .careers-chrome::before{height:128px}
  .careers-hero{padding:clamp(60px,10svh,100px) 0 52px}
  .careers-film{aspect-ratio:1.75}
  .careers-film-scene{display:flex;flex-direction:column;justify-content:center;padding:0;font-size:10.2cqw}
  .careers-film-signature{display:grid;place-items:center}
  .careers-motion-toggle{width:44px;height:44px;bottom:4px;opacity:1}
  .careers-hero+.careers-cta{margin-top:0}
  .careers-cta{padding:24px 0 100px}
  .careers-layout h2{font-size:34px;line-height:1.12}
  .careers-values{margin-top:40px;gap:12px}
  .careers-values article{padding:28px 24px;min-height:0}
  .careers-values h3{font-size:28px;line-height:1.15}
  .careers-values p{line-height:1.5}
  .careers-button{min-height:44px}
}
@media screen and (max-width:767px) and (prefers-reduced-motion:reduce){
  .chain-operations{height:auto}
  .chain-operations-sticky{position:relative;height:auto;min-height:0}
  .engine-system{height:auto;aspect-ratio:600/780;flex:none}
}
@media screen and (max-width:359px){
  .fullscreen-dialog .menu-grid{padding-inline:28px}
  .featured-nav{gap:12px}
  .audience-tabs{gap:10px}
  .audience-tabs button{font-size:16px}
  .all-expertise{min-width:62px;font-size:11px}
  .chain-topbar{padding-inline:12px;gap:6px}
  .chain-topbar button{font-size:11px}
  .chain-topbar .chain-menu-trigger{min-width:32px}
  .chain-topbar .language-switch{gap:0}
  .chain-equation{gap:4px}
  .chain-equation>span{padding:10px 5px;font-size:11px}
  .chain-detail-card,.chain-intro-copy{padding:24px 20px}
}