:root{
  --brand:#0D5257;      /* 3DPWM teal */
  --accent:#3E8489;     /* lighter teal for accents */
  --soft:#8FBABD;
  --tint:#EAF3F3;       /* very light wash */
  --tint2:#F5FAFA;
  --ink:#1c2b2c;
  --muted:#5b6f70;
  --line:#d5e4e4;
  --bg:#ffffff;
  --bad:#B4476A;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth;scroll-padding-top:64px}
body{margin:0;font:16px/1.65 -apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif;color:var(--ink);background:var(--bg)}
.wrap{max-width:980px;margin:0 auto;padding:0 20px}
a{color:var(--brand)}
img,video{max-width:100%;display:block}

/* hero */
header.hero{background:linear-gradient(180deg,var(--tint) 0%,#fff 100%);padding:56px 0 28px;text-align:center;border-bottom:1px solid var(--line)}
.badge{display:inline-block;font-size:12px;letter-spacing:.08em;text-transform:uppercase;color:var(--brand);background:#fff;border:1px solid var(--soft);border-radius:99px;padding:3px 12px;margin-bottom:16px}
h1{font-size:clamp(26px,4.4vw,40px);line-height:1.2;margin:0 0 6px;color:var(--brand)}
.sub{font-size:clamp(16px,2.4vw,21px);color:var(--accent);margin:0 0 20px;font-weight:500}
.authors{color:var(--muted);font-size:14px;margin:0 0 20px}
.authors a{color:inherit;text-decoration:underline;text-underline-offset:2px}
.authors a:hover{color:var(--brand)}
.btns{display:flex;gap:10px;justify-content:center;flex-wrap:wrap;margin-bottom:26px}
.btn{display:inline-block;padding:9px 18px;border-radius:8px;background:var(--brand);color:#fff;text-decoration:none;font-weight:600;font-size:15px}
.btn.alt{background:#fff;color:var(--brand);border:1px solid var(--brand)}
.btn:hover{opacity:.88}
.teaser{background:#fff;border:1px solid var(--line);border-radius:14px;padding:14px;max-width:760px;margin:0 auto}
.teaser img{margin:auto;width:100%;height:auto}
.cap{font-size:14px;color:var(--muted);margin:10px 4px 0}
.cap b{color:var(--brand)}

/* nav */
nav.top{position:sticky;top:0;z-index:20;background:rgba(255,255,255,.94);backdrop-filter:blur(8px);border-bottom:1px solid var(--line)}
nav.top .wrap{display:flex;justify-content:center;gap:4px;overflow-x:auto;padding:8px 20px;scrollbar-width:none}
nav.top a{white-space:nowrap;text-decoration:none;font-size:14px;color:var(--brand);padding:5px 11px;border-radius:99px}
nav.top a:hover{background:var(--tint)}

section{padding:44px 0 8px}
h2{font-size:27px;color:var(--brand);margin:0 0 6px}
h2 .n{display:inline-flex;align-items:center;justify-content:center;width:1.45em;height:1.45em;margin-right:12px;vertical-align:.08em;font-size:.82em;font-weight:700;line-height:1;color:#fff;background:var(--brand);border-radius:.32em}
h3{font-size:18px;color:var(--brand);margin:28px 0 8px}
.lead{color:var(--muted);margin:0 0 20px}
p{margin:0 0 12px}

/* takeaways */
.grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(285px,1fr));gap:14px}
.card{background:var(--tint2);border:1px solid var(--line);border-top:4px solid var(--accent);border-radius:12px;padding:16px 18px}
.card h4{margin:0 0 4px;font-size:18px;line-height:1.3;color:var(--brand)}
.card p{margin:0;font-size:15px}
.stat{font-size:28px;font-weight:700;color:var(--accent);line-height:1.1;margin-bottom:8px}
.card a.go{display:inline-block;margin-top:8px;font-size:14px}

/* takeaway bar inside each appendix section */
.take{background:var(--tint);border-left:4px solid var(--brand);border-radius:0 10px 10px 0;padding:12px 16px;margin:14px 0 18px}
.take b{color:var(--brand)}

/* videos */
.vgrid{display:grid;grid-template-columns:repeat(auto-fit,minmax(290px,1fr));gap:16px}
figure{margin:0}
figure video,figure img{width:100%;border-radius:10px;border:1px solid var(--line);background:#000}
figure img{background:#fff}
figcaption{font-size:14px;color:var(--muted);margin-top:6px}
figcaption b{color:var(--ink)}
.vwide{max-width:760px;margin:0 auto}

/* details */
details{border:1px solid var(--line);border-radius:10px;margin:12px 0;background:#fff}
summary{cursor:pointer;padding:10px 14px;font-weight:600;color:var(--brand);list-style:none}
summary::before{content:"▸";display:inline-block;margin-right:8px;transition:transform .15s}
details[open]>summary::before{transform:rotate(90deg)}
details>.body{padding:0 14px 14px}
pre{margin:0;background:#0f2f31;color:#e3f0f0;padding:14px;border-radius:8px;overflow:auto;font:13px/1.5 ui-monospace,SFMono-Regular,Menlo,monospace;white-space:pre-wrap}

/* tables */
.tw{overflow-x:auto;margin:10px 0}
table{border-collapse:collapse;width:100%;font-size:14.5px}
th,td{padding:7px 10px;border-bottom:1px solid var(--line);text-align:left}
th{background:var(--tint);color:var(--brand)}
td.num,th.num{text-align:right;font-variant-numeric:tabular-nums}
td.best{font-weight:700;color:var(--brand);background:var(--tint2)}
.two{display:grid;grid-template-columns:repeat(auto-fit,minmax(300px,1fr));gap:16px}
.pill{display:inline-block;font-size:12px;background:var(--tint);color:var(--brand);border-radius:99px;padding:1px 9px;margin-left:6px;vertical-align:middle}
.warn{border-left-color:var(--bad)}
.warn b{color:var(--bad)}
footer{margin-top:56px;padding:26px 0;border-top:1px solid var(--line);background:var(--tint2);color:var(--muted);font-size:14px;text-align:center}
@media (max-width:600px){section{padding-top:34px}h2{font-size:23px}}

.pcd-stage{width:100%;height:min(62vh,520px);min-height:300px;background:#fff;border:1px solid var(--line);border-radius:12px 12px 0 0;overflow:hidden}
.pcd-stage canvas{width:100%;height:100%;display:block;touch-action:none}
.pcd-bar{display:flex;flex-wrap:wrap;gap:10px 14px;align-items:center;padding:10px 12px;background:var(--tint);border:1px solid var(--line);border-top:0;border-radius:0 0 12px 12px}
.pcd-bar button{border:0;background:var(--brand);color:#fff;border-radius:8px;width:36px;height:32px;cursor:pointer;font-size:14px}
.pcd-bar input[type=range]{flex:1;min-width:140px;accent-color:var(--brand)}
.pcd-lab{font-size:13px;color:var(--muted);font-variant-numeric:tabular-nums;min-width:64px}
.pcd-tog{display:flex;gap:12px;font-size:13px;flex-wrap:wrap}
.pcd-tog label{display:flex;align-items:center;gap:5px;cursor:pointer}
.pcd-tog i{width:11px;height:11px;border-radius:50%;display:inline-block}

/* rollout tabs: 3DPWM teal at varying opacity */
.tabs{display:inline-flex;gap:4px;margin:0 0 14px;padding:4px;flex-wrap:wrap;background:rgba(13,82,87,.07);border:1px solid rgba(13,82,87,.15);border-radius:12px}
.tabs button{appearance:none;-webkit-appearance:none;font:inherit;font-size:14.5px;font-weight:600;letter-spacing:.01em;color:rgba(13,82,87,.85);background:transparent;border:0;border-radius:9px;padding:8px 18px;cursor:pointer;transition:background .15s,color .15s,box-shadow .15s}
.tabs button:hover{background:rgba(13,82,87,.13)}
.tabs button:focus-visible{outline:2px solid rgba(13,82,87,.55);outline-offset:2px}
.tabs button[aria-selected=true]{color:#fff;background:rgba(13,82,87,.88);box-shadow:0 1px 4px rgba(13,82,87,.3)}

hr.rule{border:0;height:4px;border-radius:4px;background:var(--brand);margin:52px 0 0}

figure img.nb{border:0;border-radius:0;background:transparent}
table.envt td:nth-child(2){min-width:260px}
td.hi{font-weight:700;color:var(--brand);background:rgba(13,82,87,.10)}
#b-model .two{grid-template-columns:repeat(2,minmax(0,1fr));align-items:start}
@media (max-width:640px){#b-model .two{grid-template-columns:1fr}}
/* key takeaways: 3 per row, last row centred */
#takeaways .grid{display:flex;flex-wrap:wrap;justify-content:center;gap:14px}
#takeaways .card{flex:0 1 calc((100% - 28px)/3);min-width:260px}