/* ============================================================================
   Case-study detail pages — shared layout, built on site.css tokens.
   Per-page accent set via  html { --accent2: <color>; }
   ============================================================================ */
:root { --accent2: var(--brand); }

/* sub nav */
.subnav { position: sticky; top: var(--header-height); z-index: 20; background: color-mix(in oklch, var(--background) 78%, transparent); backdrop-filter: blur(10px); -webkit-backdrop-filter: blur(10px); border-bottom: 1px dashed var(--border); }
.subnav .inner { display: flex; align-items: center; gap: 1.4rem; height: 52px; overflow-x: auto; scrollbar-width: none; }
.subnav .inner::-webkit-scrollbar { display:none; }
.subnav a { font: var(--text-mono); font-size: 0.76rem; letter-spacing: 0.04em; color: var(--muted-foreground); white-space: nowrap; padding: 0.3rem 0; border-bottom: 2px solid transparent; transition: color .15s, border-color .15s; }
.subnav a:hover, .subnav a.active { color: var(--foreground); border-color: var(--accent2); }
.subnav .back { margin-right: auto; display: inline-flex; align-items: center; gap: 0.4rem; color: var(--foreground); font-weight: 500; }
.subnav .back svg { width: 15px; height: 15px; }

/* eyebrow */
.lab-eyebrow { font: var(--text-mono); font-size: 0.72rem; letter-spacing: 0.18em; text-transform: uppercase; color: var(--accent2); display: inline-flex; align-items: center; gap: 0.55rem; margin-bottom: 1rem; }
.lab-eyebrow.dotted::before { content:""; width:7px; height:7px; border-radius:999px; background: var(--accent2); }

/* hero */
.cs-hero { padding-top: clamp(40px,6vw,72px); }
.cs-kicker { display:flex; gap:0.6rem; align-items:center; flex-wrap:wrap; margin-bottom: 1.6rem; }
.cs-num { font-family: var(--font-mono); font-size: 0.8rem; color: var(--accent2); }
.cs-title { font-family: var(--font-sans); font-weight: 700; letter-spacing: -0.035em; font-size: clamp(2.1rem,5vw,4rem); line-height: 1.04; max-width: 20ch; text-wrap: balance; }
.cs-role { font: var(--text-lead); color: var(--muted-foreground); max-width: 64ch; margin-top: 1.4rem; text-wrap: pretty; }
.cs-disc { font-size: 0.92rem; color: var(--muted-foreground); max-width: 64ch; margin-top: 1rem; font-style: italic; }
.cs-meta { display: grid; grid-template-columns: repeat(4, 1fr); gap: 1px; background: var(--border); border: 1px dashed var(--border); border-radius: var(--radius-lg); overflow: hidden; margin-top: clamp(28px,4vw,44px); }
.cs-meta div { background: var(--background); padding: 1.1rem 1.2rem; }
.cs-meta .k { font: var(--text-mono); font-size: 0.68rem; letter-spacing: 0.14em; text-transform: uppercase; color: var(--muted-foreground); display:block; margin-bottom: 0.4rem; }
.cs-meta .v { font-size: 0.95rem; font-weight: 500; }
@media (max-width:720px){ .cs-meta { grid-template-columns: repeat(2,1fr); } }

/* section */
.case-section { border-top: 1px dashed var(--border); }
.case-head { margin-bottom: clamp(28px,4vw,48px); }
.case-head h2 { font-family: var(--font-sans); font-weight: 700; letter-spacing: -0.03em; font-size: clamp(1.8rem,3.6vw,2.8rem); line-height: 1.05; max-width: 18ch; text-wrap: balance; }

/* reading column + prose */
.reading { max-width: 820px; }
.prose p { font-size: 1.05rem; line-height: 1.72; color: var(--foreground); margin-bottom: 1.15rem; max-width: 70ch; text-wrap: pretty; }
.prose p.muted-p { color: var(--muted-foreground); }
.prose a.inline { color: var(--accent2); border-bottom: 1px solid color-mix(in oklch, var(--accent2) 40%, transparent); }
.sub-h { font-family: var(--font-sans); font-weight: 600; font-size: 1.15rem; letter-spacing: -0.01em; margin: 2rem 0 0.9rem; }
.sub-h:first-child { margin-top: 0; }
.prose ul { list-style: none; display: grid; gap: 0.7rem; margin: 0.4rem 0 1.4rem; max-width: 70ch; }
.prose ul li { position: relative; padding-left: 1.4rem; font-size: 1.02rem; line-height: 1.6; color: var(--foreground); text-wrap: pretty; }
.prose ul li::before { content:""; position:absolute; left:0; top:0.62em; width:6px; height:6px; border-radius:999px; background: var(--accent2); }
.prose ol { padding-left: 1.2rem; display:grid; gap:0.5rem; margin: 0.4rem 0 1.4rem; max-width: 70ch; }
.prose ol li { font-size: 1.02rem; line-height: 1.6; }

/* highlight statement (the editorial pull-sentences) */
.callout { font-family: var(--font-sans); font-weight: 600; letter-spacing: -0.015em; font-size: clamp(1.3rem,2.4vw,1.8rem); line-height: 1.32; color: var(--foreground); max-width: 26ch; text-wrap: balance; margin: 0; }
.callout.wide { max-width: 34ch; }
.callout .hl { color: var(--accent2); }
.callout-row { display: grid; grid-template-columns: 0.5fr 1fr; gap: clamp(24px,5vw,64px); align-items: start; }
.callout-row .lead { font: var(--text-lead); color: var(--muted-foreground); text-wrap: pretty; }
@media (max-width:860px){ .callout-row { grid-template-columns: 1fr; gap: 24px; } }

/* quote */
.epigraph { font-style: italic; color: var(--muted-foreground); font-size: 1.05rem; border-left: 2px solid var(--accent2); padding-left: 1.1rem; max-width: 60ch; }

/* chips row */
.chips { display:flex; flex-wrap:wrap; gap:0.5rem; }
.chips .badge { border-color: color-mix(in oklch, var(--accent2) 30%, var(--border)); }

/* figures */
.fig { border: 1px solid var(--border); border-radius: var(--radius-xl); overflow: hidden; background: var(--muted); box-shadow: var(--shadow-sm); margin: 0; }
.fig img { width: 100%; height: auto; display: block; }
.fig figcaption { padding: 0.95rem 1.3rem 1.2rem; font: var(--text-small); color: var(--muted-foreground); font-style: italic; text-wrap: pretty; }
.fig-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px,1fr)); gap: 18px; }

/* cards (role/goal/challenge blocks) */
.cards-3 { display: grid; grid-template-columns: repeat(3,1fr); gap: 18px; }
.cards-2 { display: grid; grid-template-columns: repeat(2,1fr); gap: 18px; }
.card { border: 1px solid var(--border); border-radius: var(--radius-xl); background: var(--card); box-shadow: var(--shadow-sm); padding: clamp(20px,2.2vw,28px); }
.card .tag { font: var(--text-mono); font-size: 0.68rem; letter-spacing: 0.14em; text-transform: uppercase; color: var(--accent2); display:block; margin-bottom: 0.9rem; }
.card h4 { font: var(--text-h4); letter-spacing: -0.01em; margin-bottom: 0.7rem; }
.card p { color: var(--muted-foreground); font-size: 0.95rem; line-height: 1.6; text-wrap: pretty; }
.card ul { list-style:none; display:grid; gap:0.55rem; margin-top:0.4rem; }
.card ul li { position:relative; padding-left:1.2rem; font-size:0.92rem; line-height:1.5; color: var(--foreground); }
.card ul li::before { content:""; position:absolute; left:0; top:0.55em; width:5px; height:5px; border-radius:999px; background: var(--accent2); }
@media (max-width:880px){ .cards-3 { grid-template-columns: 1fr; } .cards-2 { grid-template-columns: 1fr; } }

/* results metric cards */
.results { display:grid; grid-template-columns: repeat(3,1fr); gap: 18px; }
.result { border:1px solid var(--border); border-radius: var(--radius-xl); padding: clamp(22px,2.4vw,30px); background: var(--card); box-shadow: var(--shadow-2xs); }
.result .num { font-family: var(--font-sans); font-weight: 700; letter-spacing: -0.03em; font-size: clamp(2.2rem,4vw,3rem); line-height: 1; color: var(--accent2); }
.result p { margin-top: 0.7rem; font-size: 0.96rem; line-height: 1.5; color: var(--muted-foreground); text-wrap: pretty; }
@media (max-width:880px){ .results { grid-template-columns: 1fr; } }

/* stat strip (hero metrics) */
.metrics-row { display: grid; grid-template-columns: repeat(4,1fr); gap: clamp(16px,2.5vw,32px); }
.metric-big .num { font-family: var(--font-sans); font-weight: 700; letter-spacing: -0.03em; font-size: clamp(2rem,4vw,3rem); line-height: 1; color: var(--accent2); }
.metric-big .lab { display:block; margin-top: 0.55rem; font: var(--text-small); color: var(--muted-foreground); max-width: 22ch; }
@media (max-width:720px){ .metrics-row { grid-template-columns: repeat(2,1fr); gap: 26px; } }

/* prev/next */
.casenav { display:flex; gap:18px; flex-wrap:wrap; }
.casenav a { flex:1; min-width: 240px; border:1px solid var(--border); border-radius: var(--radius-xl); padding: clamp(20px,2.4vw,28px); box-shadow: var(--shadow-2xs); transition: background .2s, transform .25s; }
.casenav a:hover { background: var(--accent); transform: translateY(-2px); }
.casenav .lbl { font: var(--text-mono); font-size:0.7rem; letter-spacing:0.14em; text-transform:uppercase; color: var(--muted-foreground); }
.casenav h5 { font-family: var(--font-sans); font-weight:600; letter-spacing:-0.02em; font-size:1.25rem; margin-top:0.6rem; }