/* Deep dive — AM Lab family look (black, Switzer light), colour-coded per module with --acc
   (white vision, SU Gold family for AM Lab labs, Columbia Blue family for Mobile CAVE sub-projects; SU Gold #FFC72C, Columbia Blue #69B3E7, Navy #00263A; every former orange is gold).
   Dark surfaces are SU Navy and its darker tints (#00263A, #001A29, #00131F), not black. */
@font-face{font-family:"Switzer";src:url(/assets/fonts/Switzer-Variable.woff2) format("woff2");font-weight:100 900;font-style:normal;font-display:swap}
:root{--bg:#00131F;--panel:#001A29;--panel-2:#00263A;--text:#fff;--muted:rgba(255,255,255,.62);--soft:rgba(255,255,255,.8);--line:rgba(255,255,255,.14);--line-strong:rgba(255,255,255,.4);--radius:14px;--max:1320px;--gutter:clamp(16px,4vw,56px);--acc:#FFC72C;--su-navy:#00263A}
*,*:before,*:after{box-sizing:border-box;margin:0}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%;background:var(--bg);scroll-padding-top:96px}
body{background:var(--bg);color:var(--text);font:400 18px/1.6 "Switzer",system-ui,-apple-system,"Segoe UI",sans-serif;overflow-x:hidden;-webkit-font-smoothing:antialiased}
a{color:inherit}
img{max-width:100%;display:block}
::selection{background:var(--acc);color:var(--su-navy)}
a:focus-visible,button:focus-visible{outline:2px solid var(--acc);outline-offset:3px}
.skip{position:absolute;left:-999px;top:8px;z-index:60;background:#fff;color:#00131F;padding:12px 16px;border-radius:10px;text-decoration:none}
.skip:focus{left:12px}
.dd-wrap{max-width:var(--max);margin:0 auto;padding-left:max(var(--gutter),env(safe-area-inset-left));padding-right:max(var(--gutter),env(safe-area-inset-right))}

/* header */
.dd-top{position:fixed;top:0;left:0;right:0;z-index:40;background:rgba(0,38,58,.96);backdrop-filter:blur(14px);-webkit-backdrop-filter:blur(14px);border-bottom:1px solid var(--line);padding-top:env(safe-area-inset-top)}
.dd-bar{display:flex;align-items:center;justify-content:space-between;gap:16px;min-height:64px;max-width:var(--max);margin:0 auto;padding:0 var(--gutter)}
.dd-brand{font-weight:500;font-size:19px;text-decoration:none;min-height:44px;display:inline-flex;align-items:center}
.dd-nav{display:flex;gap:clamp(12px,3vw,36px);font-size:12px;letter-spacing:.1em;text-transform:uppercase}
.dd-nav a{color:var(--muted);text-decoration:none;min-height:44px;display:inline-flex;align-items:center}
.dd-nav a:hover{color:#69B3E7}
.dd-nav a.on{color:#fff;box-shadow:inset 0 -2px 0 #FFC72C}
.dd-btn{display:inline-flex;align-items:center;gap:8px;min-height:40px;padding:0 16px;border:1px solid var(--line-strong);border-radius:999px;font-size:11px;letter-spacing:.1em;text-transform:uppercase;text-decoration:none}
.dd-btn:hover{background:#fff;color:#00263A;border-color:#fff}
.dd-btn{border-color:rgba(105,179,231,.7)}
.dd-dot{width:6px;height:6px;border-radius:50%;background:var(--acc)}
@media (max-width:640px){.dd-nav a:not(:first-child){display:none}.dd-btn{display:none}}

/* hero */
.dd-hero{position:relative;min-height:min(92vh,860px);display:flex;align-items:flex-end;padding:120px 0 64px;overflow:hidden;border-bottom:1px solid var(--line)}
.dd-hero-bg{position:absolute;inset:0;z-index:0}
.dd-hero-bg img{width:100%;height:100%;object-fit:cover;opacity:.55;animation:ddkb 22s ease-in-out infinite alternate}
.dd-hero-bg:after{content:"";position:absolute;inset:0;background:linear-gradient(180deg,rgba(0,19,31,.25) 0%,rgba(0,19,31,.55) 55%,#00131F 100%),linear-gradient(90deg,color-mix(in srgb,var(--acc) 38%,transparent) 0%,transparent 55%)}
@keyframes ddkb{from{transform:scale(1.02)}to{transform:scale(1.1) translate3d(-1.5%,-1%,0)}}
.dd-hero-in{position:relative;z-index:1;width:100%}
.dd-hero-hub{min-height:auto;padding:140px 0 56px;background:radial-gradient(80% 120% at 0% 0%,color-mix(in srgb,#69B3E7 26%,transparent),transparent 60%),radial-gradient(60% 100% at 100% 0%,color-mix(in srgb,#00263A 60%,transparent),transparent 60%),radial-gradient(60% 100% at 50% 120%,color-mix(in srgb,#FFC72C 22%,transparent),transparent 60%)}
.dd-kicker{font-size:12px;letter-spacing:.12em;text-transform:uppercase;color:var(--soft);display:flex;align-items:center;gap:12px;flex-wrap:wrap}
.dd-chip{display:inline-flex;align-items:center;padding:4px 10px;border-radius:999px;background:var(--acc);color:var(--su-navy);font-weight:600;letter-spacing:.08em;font-size:11px;text-transform:uppercase}
.dd-hero h1{font-weight:300;letter-spacing:-.03em;line-height:.98;font-size:clamp(2.6rem,7vw,6.4rem);max-width:15ch;margin:18px 0 0;text-wrap:balance}
.dd-lede{font-size:clamp(1.1rem,1.8vw,1.45rem);line-height:1.45;color:var(--soft);font-weight:300;max-width:46ch;margin-top:22px}
.dd-actions{display:flex;flex-wrap:wrap;gap:12px;margin-top:32px}
.dd-cta{display:inline-flex;align-items:center;min-height:46px;padding:0 22px;border-radius:999px;background:var(--acc);color:var(--su-navy);font-size:13px;letter-spacing:.08em;text-transform:uppercase;text-decoration:none;font-weight:600;border:1px solid var(--acc)}
.dd-cta:hover{filter:brightness(1.1)}
.dd-cta.ghost{background:transparent;color:#fff;border-color:var(--line-strong);font-weight:400}
.dd-cta.ghost:hover{border-color:#fff;background:#fff;color:#00131F}
.dd-legend{display:flex;flex-wrap:wrap;gap:10px 22px;margin-top:28px;font-size:13px;color:var(--soft)}
.dd-legend span{display:inline-flex;align-items:center;gap:8px}
.dd-legend span:before{content:"";width:22px;height:4px;border-radius:2px;background:var(--acc)}

/* module layout */
.dd-layout{display:grid;grid-template-columns:minmax(0,240px) minmax(0,1fr);gap:clamp(24px,5vw,80px);padding-top:64px;padding-bottom:96px}
.dd-toc{position:sticky;top:96px;align-self:start;max-height:calc(100vh - 120px);overflow:auto}
.dd-mono{font-size:11px;letter-spacing:.12em;text-transform:uppercase;color:var(--muted);margin-bottom:14px}
.dd-toc ol{list-style:none;padding:0;border-left:1px solid var(--line)}
.dd-toc li a{display:block;padding:7px 0 7px 16px;margin-left:-1px;border-left:2px solid transparent;color:var(--muted);text-decoration:none;font-size:15px;line-height:1.3;min-height:36px}
.dd-toc li a:hover{color:#fff}
.dd-toc li a.on{color:#fff;border-left-color:var(--acc)}
.dd-toc-pdf{display:flex;margin-top:22px;font-size:12px;letter-spacing:.1em;text-transform:uppercase;color:var(--acc);text-decoration:none;min-height:44px;align-items:center}
@media (max-width:960px){.dd-layout{grid-template-columns:1fr}.dd-toc{position:static;max-height:none;border:1px solid var(--line);border-radius:var(--radius);padding:18px 20px;background:var(--panel)}.dd-toc ol{columns:2;column-gap:20px}}
@media (max-width:520px){.dd-toc ol{columns:1}}
.dd-article{min-width:0}
.dd-sec{padding:56px 0;border-top:1px solid var(--line)}
.dd-sec:first-child{border-top:0;padding-top:0}
.dd-num{font-size:12px;letter-spacing:.12em;color:var(--acc);margin-bottom:10px}
.dd-sec h2{font-weight:300;letter-spacing:-.025em;line-height:1.02;font-size:clamp(2rem,4.4vw,3.6rem);margin:0 0 28px;max-width:18ch}
.dd-prose{max-width:70ch}
.dd-prose p,.dd-acc-b p,.dd-card p{color:var(--soft);margin:0 0 16px}
.dd-prose h4,.dd-acc-b h4,.dd-card h4{font-size:1.15rem;font-weight:500;margin:26px 0 10px;color:#fff}
.dd-prose ul,.dd-prose ol,.dd-acc-b ul,.dd-card ul{padding-left:1.2em;margin:0 0 16px;color:var(--soft)}
.dd-prose li,.dd-acc-b li,.dd-card li{margin:6px 0}
.dd-prose li::marker,.dd-acc-b li::marker{color:var(--acc)}
blockquote{border-left:3px solid var(--acc);padding:6px 0 6px 18px;margin:18px 0;color:#fff;font-size:1.15rem;font-weight:300}
.dd-prose a,.dd-acc-b a,.dd-sources a{color:#fff;text-decoration-color:var(--acc);text-underline-offset:3px}
code{font-size:.9em;background:var(--panel-2);padding:1px 6px;border-radius:6px}

/* facts */
.dd-facts{display:grid;grid-template-columns:repeat(auto-fit,minmax(min(100%,210px),1fr));gap:1px;background:var(--line);border:1px solid var(--line);border-radius:var(--radius);overflow:hidden}
.dd-fact{background:var(--bg);padding:22px 22px 24px;position:relative}
.dd-fact:before{content:"";position:absolute;left:22px;top:0;width:28px;height:3px;background:var(--acc)}
.dd-fk{font-size:12px;letter-spacing:.1em;text-transform:uppercase;color:var(--muted);margin:10px 0 8px}
.dd-fv{font-size:1.05rem;line-height:1.45;color:#fff}

/* accordion */
.dd-acc{list-style:none;padding:0;border-top:1px solid var(--line)}
.dd-acc-i{border-bottom:1px solid var(--line)}
.dd-acc-h{all:unset;box-sizing:border-box;display:flex;align-items:center;gap:18px;width:100%;min-height:64px;padding:16px 4px;cursor:pointer;font-size:clamp(1.1rem,1.9vw,1.4rem);font-weight:300;line-height:1.3}
.dd-acc-h:hover{color:var(--acc)}
.dd-acc-h:focus-visible{outline:2px solid var(--acc);outline-offset:2px}
.dd-step,.dd-q{flex:0 0 auto;font-size:12px;letter-spacing:.1em;color:var(--acc);min-width:28px}
.dd-acc-h>span:nth-child(2){flex:1}
.dd-plus{width:16px;height:16px;position:relative;flex:0 0 auto}
.dd-plus:before,.dd-plus:after{content:"";position:absolute;left:0;top:7px;width:16px;height:2px;background:currentColor;transition:transform .3s ease}
.dd-plus:after{transform:rotate(90deg)}
.dd-acc-i.on .dd-plus:after{transform:rotate(0)}
.dd-acc-b{padding:0 4px 24px 46px;max-width:74ch}
@media (max-width:560px){.dd-acc-b{padding-left:4px}}

/* tabs */
.dd-tabs{display:inline-flex;gap:4px;padding:4px;border:1px solid var(--line);border-radius:999px;margin-bottom:28px;flex-wrap:wrap}
.dd-tab{all:unset;cursor:pointer;min-height:44px;padding:0 20px;border-radius:999px;display:inline-flex;align-items:center;font-size:13px;letter-spacing:.08em;text-transform:uppercase;color:var(--muted)}
.dd-tab[aria-selected="true"]{background:var(--acc);color:var(--su-navy);font-weight:600}
.dd-tab:focus-visible{outline:2px solid var(--acc);outline-offset:2px}

/* cards */
.dd-cards{display:grid;grid-template-columns:repeat(auto-fit,minmax(min(100%,260px),1fr));gap:16px}
.dd-card{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);padding:24px;border-top:3px solid var(--acc)}
.dd-card h3{font-weight:400;font-size:1.25rem;margin-bottom:10px}
.dd-gallery{display:grid;grid-template-columns:repeat(auto-fit,minmax(min(100%,240px),1fr));gap:12px;padding:8px 0 48px}
.dd-gallery figure{border-radius:var(--radius);overflow:hidden;aspect-ratio:4/3;background:var(--panel)}
.dd-gallery img{width:100%;height:100%;object-fit:cover;transition:transform .6s ease}
.dd-gallery figure:hover img{transform:scale(1.04)}
.dd-rels{display:flex;flex-wrap:wrap;gap:10px;margin-top:22px}
.dd-rel{display:inline-flex;align-items:center;gap:10px;min-height:44px;padding:8px 16px 8px 8px;border:1px solid var(--line);border-radius:999px;text-decoration:none;font-size:15px}
.dd-rel span{background:var(--acc);color:var(--su-navy);border-radius:999px;padding:3px 9px;font-size:11px;font-weight:600;letter-spacing:.06em}
.dd-rel:hover{border-color:var(--acc)}
.dd-sources ul,.dd-sources ol{padding-left:1.2em;color:var(--muted);font-size:15px}
.dd-sources li{margin:8px 0;word-break:break-word}

/* prev / next */
.dd-pn{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin-top:56px}
.dd-pn a{display:flex;flex-direction:column;gap:6px;padding:22px;border:1px solid var(--line);border-radius:var(--radius);text-decoration:none;font-size:1.15rem;font-weight:300;border-top:3px solid var(--acc);min-height:44px}
.dd-pn a span{font-size:11px;letter-spacing:.12em;text-transform:uppercase;color:var(--muted)}
.dd-pn a.next{text-align:right}
.dd-pn a:hover{background:var(--panel)}
@media (max-width:560px){.dd-pn{grid-template-columns:1fr}.dd-pn a.next{text-align:left}}

/* hub */
.dd-group{padding:72px 0 8px}
.dd-ghead{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr);gap:24px;align-items:end;margin-bottom:28px}
.dd-ghead h2{font-weight:300;letter-spacing:-.025em;line-height:1;font-size:clamp(2rem,4.6vw,3.8rem)}
.dd-ghead p{color:var(--muted);max-width:44ch}
@media (max-width:760px){.dd-ghead{grid-template-columns:1fr}}
.dd-hgrid{display:grid;grid-template-columns:repeat(auto-fill,minmax(min(100%,300px),1fr));gap:16px}
.dd-hcard{background:var(--panel);border:1px solid var(--line);border-radius:var(--radius);overflow:hidden;display:flex;flex-direction:column;border-top:3px solid var(--acc);transition:border-color .3s ease,transform .3s ease}
.dd-hcard:hover{border-color:var(--acc);transform:translateY(-2px)}
.dd-hcard-img{display:block;aspect-ratio:16/9;overflow:hidden;background:#00263A}
.dd-hcard-img img{width:100%;height:100%;object-fit:cover;transition:transform .6s ease}
.dd-hcard:hover .dd-hcard-img img{transform:scale(1.05)}
.dd-hcard-in{padding:20px 22px 22px;display:flex;flex-direction:column;gap:10px;flex:1}
.dd-hcard h3{font-weight:300;font-size:1.45rem;line-height:1.15;letter-spacing:-.01em}
.dd-hcard h3 a{text-decoration:none}
.dd-hcard p{color:var(--muted);font-size:16px}
.dd-hcard .dd-chip{align-self:flex-start;color:var(--su-navy)}
.dd-hlinks{display:flex;gap:18px;margin-top:auto;padding-top:8px}
.dd-hlinks a{font-size:12px;letter-spacing:.1em;text-transform:uppercase;color:#fff;text-decoration:none;min-height:44px;display:inline-flex;align-items:center;border-bottom:1px solid var(--acc)}

.dd-foot{border-top:1px solid var(--line);padding:40px 0 calc(40px + env(safe-area-inset-bottom));color:var(--muted);font-size:14px}
.dd-foot p{margin:6px 0}
.dd-foot a{color:#fff}

/* reveal (GSAP adds the motion; without JS everything is visible) */
@media (prefers-reduced-motion:reduce){.dd-hero-bg img{animation:none}*{scroll-behavior:auto!important}}
.dd-toc-pdf+.dd-toc-pdf{margin-top:0}

/* launch pop-up never prints */
@media print{.su-l{display:none!important}}

/* Title band (hub + every module page): solid SU Columbia Blue #69B3E7 with SU Navy #00263A words, same as XR Jags.
   No dark overlay. The module photo is kept as a framed photo beside the text (right on desktop, under the text on phones). */
.dd-hero,.dd-hero-hub{background:#69B3E7;color:#00263A;border-bottom:0;min-height:auto;padding:132px 0 64px;align-items:center}
.dd-hero-hub{padding:140px 0 56px}
.dd-hero .dd-kicker,.dd-hero .dd-lede,.dd-hero .dd-legend{color:#00263A}
.dd-hero h1{color:#00263A}
.dd-hero .dd-chip{background:#00263A;color:#fff}
.dd-hero .dd-cta{background:#00263A;border-color:#00263A;color:#fff}
.dd-hero .dd-cta:hover{filter:none;background:#003A57;border-color:#003A57}
.dd-hero .dd-cta.ghost{background:transparent;color:#00263A;border-color:#00263A;font-weight:500}
.dd-hero .dd-cta.ghost:hover{background:#00263A;color:#fff}
.dd-hero a:focus-visible,.dd-hero button:focus-visible{outline-color:#00263A}
.dd-hero .dd-legend span:before{box-shadow:0 0 0 1px #00263A}
.dd-hero-photo .dd-hero-in{display:grid;grid-template-columns:minmax(0,1.15fr) minmax(0,1fr);gap:clamp(28px,4vw,64px);align-items:center}
.dd-hero-photo .dd-hero-txt{grid-column:1;grid-row:1;min-width:0}
.dd-hero-photo h1{font-size:clamp(2.4rem,5.2vw,5rem)}
.dd-hero-fig{grid-column:2;grid-row:1;margin:0;border-radius:var(--radius);overflow:hidden;aspect-ratio:4/3;background:#00263A;box-shadow:0 0 0 1px rgba(0,38,58,.25),0 18px 40px -18px rgba(0,38,58,.55)}
.dd-hero-fig img{width:100%;height:100%;object-fit:cover}
@media (max-width:860px){
  .dd-hero{padding:104px 0 44px}
  .dd-hero-photo .dd-hero-in{grid-template-columns:1fr;gap:28px}
  .dd-hero-photo .dd-hero-txt{grid-row:1}
  .dd-hero-fig{grid-column:1;grid-row:2;aspect-ratio:16/10}
}

/* Oct 26: keep the fixed top menu below the visible part of the launch strip (set by su-launch.js) */
.dd-top{top:var(--su-b-h,0px)}