/* ─── Case study layout · clean editorial · sidebar + main ─── */
/* Extends assets/new.css tokens. Load new.css first. */
/* Keeps our basics (Archivo, IBM Plex Mono, #e0331c) with a soft, airy,
   mostly-borderless aesthetic: persistent left rail, two-column hero,
   rounded stat cards, Case Snapshot block, generous whitespace. */

:root {
  --cs-soft: #f4f2ed;      /* soft panel */
  --cs-soft2: #efece5;     /* divider inside panels */
  --cs-radius: 14px;
  --cs-maxw: 1220px;
}

.case { }

/* Reading progress */
.cs-progress { position: fixed; top: 0; left: 0; right: 0; height: 2px; z-index: 60; background: transparent; }
.cs-progress > i { display: block; height: 100%; width: 0%; background: var(--n-accent); transition: width .12s linear; }

/* ─── Two-column body ─── */
.cs-wrap {
  max-width: var(--cs-maxw); margin: 0 auto;
  display: grid; grid-template-columns: 232px 1fr; gap: 72px;
  padding: 0 48px;
  align-items: start;
}

/* Left rail */
.cs-side { position: sticky; top: 96px; padding: 44px 0 60px; }
.cs-side .caseid { font-size: 20px; font-weight: 700; letter-spacing: -0.02em; }
.cs-side .caseid small { display: block; font-family: var(--n-mono); font-size: 10.5px; letter-spacing: .06em; text-transform: uppercase; color: var(--n-faint); font-weight: 400; margin-top: 6px; }
.cs-side .ml { margin-top: 26px; }
.cs-side .ml .l { font-family: var(--n-mono); font-size: 10px; letter-spacing: .08em; text-transform: uppercase; color: var(--n-faint); }
.cs-side .ml .v { font-size: 13px; color: var(--n-ink2); line-height: 1.45; margin-top: 5px; }
.cs-side .toc { margin-top: 34px; }
.cs-side .toc .tt { font-family: var(--n-mono); font-size: 10px; letter-spacing: .08em; text-transform: uppercase; color: var(--n-faint); margin-bottom: 12px; }
.cs-side .toc a {
  display: flex; gap: 12px; align-items: baseline;
  padding: 6px 0 6px 12px; margin-left: -14px;
  font-size: 13px; color: var(--n-mut);
  border-left: 2px solid transparent;
  transition: color .18s, border-color .18s;
}
.cs-side .toc a .n { font-family: var(--n-mono); font-size: 10px; color: var(--n-faint); flex: none; width: 16px; }
.cs-side .toc a:hover { color: var(--n-ink); }
.cs-side .toc a.active { color: var(--n-ink); border-left-color: var(--n-accent); }
.cs-side .toc a.active .n { color: var(--n-accent); }

/* Main column */
.cs-main { min-width: 0; max-width: 860px; padding: 44px 0 24px; }

/* ─── Hero (single column + full-width cover) ─── */
.cs-hero .kicker { margin-bottom: 20px; }
.cs-hero h1 { margin: 0; font-size: clamp(40px, 5vw, 62px); font-weight: 700; letter-spacing: -0.03em; line-height: 1.02; max-width: 16ch; }
.cs-hero .intro { margin: 24px 0 0; font-size: 17px; color: var(--n-ink2); line-height: 1.7; max-width: 64ch; }
.cs-hero .intro b { color: var(--n-ink); font-weight: 600; }
.cs-cover { margin-top: 40px; border-radius: var(--cs-radius); overflow: hidden; border: 1px solid var(--n-rule); background: #fff; }
.cs-cover img { display: block; width: 100%; height: auto; }

/* ─── Stat cards ─── */
.cs-stats {
  margin-top: 48px;
  background: var(--cs-soft); border-radius: var(--cs-radius);
  display: grid; grid-template-columns: repeat(4, 1fr);
}
.cs-stats .st { padding: 26px 26px 22px; border-left: 1px solid var(--cs-soft2); transition: background .25s; border-radius: var(--cs-radius); }
.cs-stats .st:hover { background: rgba(255,255,255,.65); }
.cs-stats .st:first-child { border-left: none; }
.cs-stats .st .v { font-size: 34px; font-weight: 800; letter-spacing: -0.03em; line-height: 1; display: flex; align-items: baseline; gap: 6px; }
.cs-stats .st .v .ar { color: var(--n-green); font-size: 18px; font-weight: 700; }
.cs-stats .st .v .ar.bad { color: var(--n-accent); }
.cs-stats .st .v .ar.neutral { color: var(--n-faint); }
.cs-stats .st .d { font-size: 13px; color: var(--n-ink3); line-height: 1.5; margin-top: 12px; }
.cs-stats .st .cat { font-family: var(--n-mono); font-size: 10px; letter-spacing: .08em; text-transform: uppercase; color: var(--n-faint); margin-top: 16px; }

/* ─── Case snapshot ─── */
.cs-snap { margin-top: 64px; }
.cs-snap .lbl { font-family: var(--n-mono); font-size: 10px; letter-spacing: .1em; text-transform: uppercase; color: var(--n-faint); padding-bottom: 16px; border-bottom: 1px solid var(--n-rule); }
.cs-snap .row { display: grid; gap: 32px; padding: 24px 0; border-bottom: 1px solid var(--n-rule); }
.cs-snap .row.four { grid-template-columns: repeat(4, 1fr); }
.cs-snap .row.three { grid-template-columns: repeat(3, 1fr); }
.cs-snap .f .k { font-family: var(--n-mono); font-size: 10px; letter-spacing: .08em; text-transform: uppercase; color: var(--n-faint); }
.cs-snap .f .t { font-size: 14px; color: var(--n-ink2); line-height: 1.55; margin-top: 8px; }
.cs-snap .f .t b { color: var(--n-ink); font-weight: 600; }

/* ─── Sections ─── */
.cs-sec { padding: 56px 0; border-bottom: 1px solid var(--n-rule); }
.cs-sec:last-of-type { border-bottom: none; }
.cs-sec .ey { font-family: var(--n-mono); font-size: 11px; letter-spacing: .06em; color: var(--n-accent); }
.cs-sec .ey .t { color: var(--n-faint); }
.cs-sec h2 { margin: 16px 0 0; font-size: clamp(28px, 3.2vw, 36px); font-weight: 700; letter-spacing: -0.02em; line-height: 1.08; max-width: 20ch; }
.cs-sec .lede { margin: 22px 0 0; }

/* Text */
.cs-p { font-size: 16px; color: var(--n-ink2); line-height: 1.75; margin: 0 0 18px; max-width: 68ch; }
.cs-p:last-child { margin-bottom: 0; }
.cs-p.mut { color: var(--n-ink3); }
.cs-p b { color: var(--n-ink); font-weight: 600; }
.cs-sub { font-size: 18px; font-weight: 600; letter-spacing: -0.01em; margin: 30px 0 14px; }

/* Numbered list */
.cs-list { margin: 22px 0 0; }
.cs-list .it { display: grid; grid-template-columns: 26px 1fr; gap: 14px; padding: 12px 0 12px 4px; border-bottom: 1px solid var(--n-rule); transition: background .2s, padding-left .2s; }
.cs-list .it:first-child { border-top: 1px solid var(--n-rule); }
.cs-list .it:hover { background: var(--n-hover); padding-left: 10px; }
.cs-list .it .n { font-family: var(--n-mono); font-size: 11px; color: var(--n-accent); padding-top: 3px; }
.cs-list .it .t { font-size: 15px; color: var(--n-ink2); line-height: 1.6; }
.cs-list .it .t b { color: var(--n-ink); font-weight: 600; }

/* Figure */
.cs-fig { margin: 30px 0 0; }
.cs-fig .lab { font-family: var(--n-mono); font-size: 11px; color: var(--n-faint); margin-bottom: 14px; }
.cs-fig .frame { border-radius: var(--cs-radius); overflow: hidden; border: 1px solid var(--n-rule); background: #fff; }
.cs-fig .frame img { display: block; width: 100%; height: auto; }
.cs-fig .cap { font-size: 13.5px; color: var(--n-ink3); line-height: 1.65; margin-top: 14px; max-width: 68ch; }
.cs-fig .twoup { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; }
.cs-fig .twoup .frame { display: flex; flex-direction: column; }
.cs-fig .twoup .frame .tag { padding: 12px 16px; border-bottom: 1px solid var(--n-rule); font-family: var(--n-mono); font-size: 10.5px; letter-spacing: .06em; text-transform: uppercase; color: var(--n-faint); display: flex; justify-content: space-between; }
.cs-fig .twoup .frame .ct { padding: 14px 16px; border-top: 1px solid var(--n-rule); font-size: 12.5px; color: var(--n-ink3); line-height: 1.55; }

/* Metrics (soft) */
.cs-metrics { margin: 26px 0 0; background: var(--cs-soft); border-radius: var(--cs-radius); display: grid; grid-template-columns: repeat(2, 1fr); }
.cs-metrics.three { grid-template-columns: repeat(3, 1fr); }
.cs-metrics > div { padding: 24px; border-left: 1px solid var(--cs-soft2); border-top: 1px solid var(--cs-soft2); }
.cs-metrics.three > div:nth-child(-n+3),
.cs-metrics > div:nth-child(-n+2) { border-top: none; }
.cs-metrics > div:nth-child(odd) { border-left: none; }
.cs-metrics.three > div:nth-child(3n+1) { border-left: none; }
.cs-metrics.three > div:nth-child(odd) { border-left: 1px solid var(--cs-soft2); }
.cs-metrics.three > div:nth-child(3n+1) { border-left: none; }
.cs-metrics .v { font-size: 32px; font-weight: 800; letter-spacing: -0.03em; line-height: 1; color: var(--n-ink); }
.cs-metrics .v.accent { color: var(--n-accent); }
.cs-metrics .l { font-size: 13px; font-weight: 600; margin-top: 10px; }
.cs-metrics .note { font-size: 12.5px; color: var(--n-mut); line-height: 1.5; margin-top: 6px; }

/* Quote */
.cs-quote { margin: 30px 0 0; padding: 2px 0 2px 38px; max-width: 62ch; position: relative; }
.cs-quote::before { content: "\201C"; position: absolute; left: 0; top: -8px; font-size: 46px; line-height: 1; font-weight: 700; color: var(--n-accent); }
.cs-quote .q { font-size: 20px; font-style: italic; line-height: 1.45; color: var(--n-ink); }
.cs-quote .by { font-family: var(--n-mono); font-size: 11px; color: var(--n-faint); margin-top: 12px; }

/* Compare — rejected options */
.cs-compare { display: grid; grid-template-columns: 1fr 1fr 1fr; gap: 16px; margin: 28px 0 0; }
.cs-compare .opt { border: 1px solid var(--n-rule); border-radius: var(--cs-radius); padding: 22px; background: #fff; transition: transform .25s ease, border-color .25s, box-shadow .25s; }
.cs-compare .opt:hover { transform: translateY(-3px); border-color: #cfccc4; box-shadow: 0 6px 18px rgba(17,17,16,.05); }
.cs-compare .opt.picked:hover { border-color: var(--n-accent); }
.cs-compare .opt .mark { font-family: var(--n-mono); font-size: 11px; letter-spacing: .06em; text-transform: uppercase; color: var(--n-faint); display: flex; align-items: center; gap: 8px; }
.cs-compare .opt .mark .x { color: #b6b1a8; }
.cs-compare .opt .h { font-size: 16px; font-weight: 600; margin: 12px 0 8px; letter-spacing: -0.01em; }
.cs-compare .opt .d { font-size: 13px; color: var(--n-mut); line-height: 1.6; }
.cs-compare .opt.picked { border-color: var(--n-accent); background: color-mix(in oklab, var(--n-accent) 4%, #fff); }
.cs-compare .opt.picked .mark { color: var(--n-accent); }

/* Callout */
.cs-callout { margin: 28px 0 0; padding: 20px 22px; background: var(--cs-soft); border-radius: var(--cs-radius); font-size: 15px; color: var(--n-ink2); line-height: 1.65; max-width: 70ch; }
.cs-callout b { color: var(--n-ink); font-weight: 600; }

/* Reflection rows */
.cs-reflect { margin: 8px 0 0; }
.cs-reflect .r { display: grid; grid-template-columns: 48px 1fr; gap: 24px; padding: 24px 0; border-bottom: 1px solid var(--n-rule); }
.cs-reflect .r:first-child { border-top: 1px solid var(--n-rule); }
.cs-reflect .r .n { font-family: var(--n-mono); font-size: 11px; color: var(--n-accent); padding-top: 5px; }
.cs-reflect .r h3 { margin: 0 0 8px; font-size: 18px; font-weight: 600; letter-spacing: -0.01em; }
.cs-reflect .r p { margin: 0; font-size: 15px; color: var(--n-ink2); line-height: 1.7; max-width: 68ch; }
.cs-reflect .r p b { color: var(--n-ink); font-weight: 600; }

/* Next case */
.cs-next {
  max-width: var(--cs-maxw); margin: 0 auto; padding: 48px;
  display: grid; grid-template-columns: 1fr auto; gap: 40px; align-items: center;
  border-top: 1px solid var(--n-rule);
}
.cs-next .k { font-family: var(--n-mono); font-size: 11px; color: var(--n-faint); }
.cs-next h3 { margin: 10px 0 10px; font-size: clamp(28px, 3.6vw, 44px); font-weight: 700; letter-spacing: -0.025em; line-height: 1.02; }
.cs-next p { margin: 0; font-size: 14.5px; color: var(--n-mut); line-height: 1.55; max-width: 64ch; }
.cs-next .arr { font-size: 42px; color: var(--n-faint); font-weight: 300; transition: transform .2s, color .2s; }
.cs-next:hover .arr { transform: translateX(8px); color: var(--n-accent); }

html.js .reveal { opacity: 0; transform: translateY(14px); transition: opacity .6s cubic-bezier(0.22, 1, 0.36, 1), transform .6s cubic-bezier(0.22, 1, 0.36, 1); }
html.js .reveal.in { opacity: 1; transform: none; }

@media (max-width: 1040px) {
  .cs-wrap { grid-template-columns: 1fr; gap: 0; padding: 0 24px; }
  .cs-side { position: static; padding: 28px 0 0; }
  .cs-side .toc { display: none; }
  .cs-side .ml { display: inline-block; margin-right: 40px; }
  .cs-main { padding: 24px 0; max-width: none; }
  .cs-stats { grid-template-columns: 1fr 1fr; }
  .cs-stats .st:nth-child(3) { border-left: none; }
  .cs-stats .st:nth-child(n+3) { border-top: 1px solid var(--cs-soft2); }
  .cs-snap .row.four { grid-template-columns: 1fr 1fr; }
  .cs-snap .row.three { grid-template-columns: 1fr; }
  .cs-compare { grid-template-columns: 1fr; }
  .cs-fig .twoup { grid-template-columns: 1fr; }
  .cs-metrics, .cs-metrics.three { grid-template-columns: 1fr; }
  .cs-metrics > div { border-left: none !important; border-top: 1px solid var(--cs-soft2); }
  .cs-metrics > div:first-child { border-top: none; }
  .cs-next { grid-template-columns: 1fr; padding: 36px 24px; }
}

@media (max-width: 560px) {
  .cs-stats { grid-template-columns: 1fr; }
  .cs-stats .st { border-left: none; border-top: 1px solid var(--cs-soft2); }
  .cs-stats .st:first-child { border-top: none; }
  .cs-snap .row.four { grid-template-columns: 1fr; }
}

/* Figure toggles: swapped images crossfade in instead of snapping (motion-gap fix) */
.cmp-img { animation: cmpfade .28s cubic-bezier(0.22, 1, 0.36, 1); }
@keyframes cmpfade { from { opacity: 0.3; } }