.case-study { --case-width: 1120px; --case-column: 720px; --case-wide: 1000px; --case-dark-line: #40514c; --case-mint: #8bd1c6; --case-dim: #becbc3; --case-tag-easy-bg: #e3efe9; --case-tag-easy: #0f5f5b; --case-tag-mid-bg: #ece6d6; --case-tag-hard-bg: #f6dcd4; --case-tag-hard: #9a2a1c; --case-pick-bg: #fbf1d9; }
.case-wrap { width: min(var(--case-width), calc(100% - 48px)); margin: 0 auto; }
.case-column { width: min(var(--case-column), calc(100% - 48px)); margin-left: auto; margin-right: auto; }
.case-wide { width: min(var(--case-wide), calc(100% - 48px)); margin-left: auto; margin-right: auto; box-sizing: border-box; }

/* Header */
.case-hero { background: var(--charcoal); color: var(--paper); padding: 28px 0 72px; }
.case-hero a { color: var(--paper); }
.case-topline { padding-bottom: 28px; border-bottom: 1px solid var(--case-dark-line); font: 13px var(--font-mono); }
.case-topline a { text-decoration: none; }
.case-hero h1 { font: 600 clamp(44px, 6.4vw, 76px)/1.02 var(--font-serif); letter-spacing: -.035em; margin: 72px 0 0; }
.case-dek { margin: 22px 0 0; font: italic clamp(19px, 2.2vw, 24px)/1.5 var(--font-serif); color: #e1e5db; }
.case-meta { margin: 32px 0 0; padding-top: 20px; border-top: 1px solid var(--case-dark-line); font-size: 14px; line-height: 1.7; color: var(--case-dim); }
.case-hero .case-meta a { color: var(--case-mint); font-weight: 600; text-underline-offset: 4px; }

/* Essay prose */
.case-main { padding-bottom: 8px; }
.case-prose { padding-top: 40px; font-size: 18px; line-height: 1.75; color: #2b2e28; }
.case-main > .case-prose:first-child { padding-top: 72px; }
.case-prose h2 { margin: 0 0 20px; font: 600 32px/1.2 var(--font-serif); letter-spacing: -.02em; color: var(--ink); }
.case-prose h2.case-section-title { margin-top: 80px; }
.case-prose h3 { margin: 0 0 18px; font: 600 26px/1.25 var(--font-serif); color: var(--ink); }
.case-prose p { margin: 0 0 22px; }
.case-prose > :last-child { margin-bottom: 0; }
.case-pull { font: 22px/1.55 var(--font-serif); color: var(--ink); }
.case-phase-num { margin: 56px 0 6px !important; font: 12px var(--font-mono); letter-spacing: .1em; text-transform: uppercase; color: var(--teal); }
.case-phases + .case-phase-num { margin-top: 0 !important; }
.case-label { margin: 0; font: 500 12px var(--font-mono); letter-spacing: .12em; text-transform: uppercase; color: var(--teal); }

/* Rubric table */
.case-rubric { padding-top: 40px; }
.case-rubric-head { display: flex; flex-wrap: wrap; justify-content: space-between; align-items: flex-end; gap: 12px 32px; padding-bottom: 16px; }
.case-rubric-head p { margin: 6px 0 0; max-width: 62ch; font-size: 14px; line-height: 1.55; color: var(--muted); }
.case-rubric-head .case-rubric-meta { margin: 0; font: 11px var(--font-mono); }
.case-table-wrap { overflow-x: auto; background: var(--surface); border: 1px solid var(--line); border-radius: 6px; }
.case-table-wrap:focus-visible { outline: 3px solid var(--teal-bright); outline-offset: 3px; }
.case-table { width: 100%; min-width: 640px; border-collapse: collapse; font-size: 14px; }
.case-table th, .case-table td { padding: 10px 16px; text-align: left; vertical-align: middle; border-bottom: 1px solid var(--case-tag-mid-bg); }
.case-table thead th { padding-top: 12px; padding-bottom: 12px; border-bottom: 2px solid var(--ink); font: 500 11px var(--font-mono); letter-spacing: .08em; text-transform: uppercase; color: var(--muted); white-space: nowrap; }
.case-table tbody th { font-size: 15px; font-weight: 600; color: var(--ink); white-space: nowrap; }
.case-table td { color: var(--muted); }
.case-table tbody tr:nth-child(even) { background: #faf7ee; }
.case-table tbody tr:last-child > * { border-bottom: 0; }
.case-table tr.is-pick { background: var(--case-pick-bg); box-shadow: inset 4px 0 0 var(--gold); }
.case-pick { display: inline-block; margin-left: 8px; padding: 2px 7px; border-radius: 999px; background: var(--charcoal); color: var(--paper); font: 500 10px var(--font-mono); letter-spacing: .06em; text-transform: uppercase; vertical-align: 1px; }
.case-score { --seg: 10px; --gap: 2px; --fill: var(--teal); display: inline-flex; align-items: center; gap: 10px; font-weight: 600; font-size: 15px; color: var(--ink); font-variant-numeric: tabular-nums; }
.case-score::after { content: ""; width: calc(10 * (var(--seg) + var(--gap)) - var(--gap)); height: 10px; border-radius: 2px;
  background:
    repeating-linear-gradient(90deg, var(--fill) 0 var(--seg), transparent var(--seg) calc(var(--seg) + var(--gap))) 0 0 / calc(var(--score) * (var(--seg) + var(--gap))) 100% no-repeat,
    repeating-linear-gradient(90deg, #e7e0cf 0 var(--seg), transparent var(--seg) calc(var(--seg) + var(--gap))); }
.is-pick .case-score { --fill: var(--gold); }
.case-tag { display: inline-block; padding: 2px 8px; border-radius: 3px; background: var(--case-tag-mid-bg); color: var(--muted); font-size: 12px; font-weight: 500; white-space: nowrap; }
.case-tag.is-easy { background: var(--case-tag-easy-bg); color: var(--case-tag-easy); }
.case-tag.is-hard { background: var(--case-tag-hard-bg); color: var(--case-tag-hard); }
.case-note { margin: 10px 0 0; font-size: 13px; line-height: 1.6; color: var(--muted); }

/* Data questions */
.case-questions { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 12px; margin: 8px 0 28px; }
.case-questions div { display: flex; flex-direction: column; gap: 6px; padding: 18px 20px; background: var(--surface); border: 1px solid var(--line); }
.case-questions dt { font: 11px var(--font-mono); letter-spacing: .08em; text-transform: uppercase; color: var(--teal); }
.case-questions dd { margin: 0; display: flex; flex-direction: column; gap: 6px; font-size: 14px; line-height: 1.55; color: var(--muted); }
.case-questions strong { font-size: 22px; line-height: 1.25; color: var(--ink); font-variant-numeric: tabular-nums; }
.case-next { margin: 0; padding: 0; list-style: none; border-top: 1px solid var(--line); }
.case-next li { padding: 16px 0; border-bottom: 1px solid var(--line); }
.case-next strong { color: var(--ink); }

/* Phase strip */
.case-phases { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); margin: 0 0 48px; padding: 0; list-style: none; border-top: 2px solid var(--ink); }
.case-phases li { display: flex; flex-direction: column; gap: 4px; padding: 14px 12px 0 0; }
.case-phases span { font: 12px var(--font-mono); color: var(--teal); }
.case-phases strong { font-size: 16px; color: var(--ink); line-height: 1.3; }
.case-phases small { font-size: 13px; line-height: 1.45; color: var(--muted); }

/* AI council */
.case-council { margin-top: 28px; margin-bottom: 0; padding: 28px; display: flex; flex-direction: column; gap: 24px; background: var(--charcoal); color: var(--paper); border-radius: 6px; }
.case-council-head { display: flex; flex-wrap: wrap; justify-content: space-between; align-items: baseline; gap: 8px 24px; font: 12px var(--font-mono); color: var(--case-dim); }
.case-council-head figcaption { letter-spacing: .12em; text-transform: uppercase; color: var(--case-mint); }
.case-council-steps { margin: 0; padding: 0; list-style: none; display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 12px; }
.case-council-steps li { display: flex; flex-direction: column; gap: 6px; padding: 16px; border: 1px solid var(--case-dark-line); border-radius: 4px; font-size: 13px; line-height: 1.5; color: var(--case-dim); }
.case-council-steps span { font: 11px var(--font-mono); color: var(--case-mint); }
.case-council-steps strong { font-size: 16px; color: var(--paper); }
.case-council-label { margin: 0 0 -12px; font: 11px var(--font-mono); letter-spacing: .1em; text-transform: uppercase; color: #e8917f; }
.case-specimens { margin: 0; padding: 0; list-style: none; display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 12px; }
.case-specimens li { padding: 14px 16px; background: #1d2b29; border-radius: 4px; font: italic 15px/1.5 var(--font-serif); color: #e1e5db; }
.case-council-winner { margin: 0; padding-top: 16px; border-top: 1px solid var(--case-dark-line); font-size: 14px; line-height: 1.6; color: var(--case-dim); }
.case-council-winner strong { color: var(--paper); }

/* Closing */
.case-closing { margin-top: 48px; padding-top: 32px; border-top: 1px solid var(--line); }
.case-prose .case-closing p { font: 21px/1.65 var(--font-serif); color: var(--ink); margin: 0 0 20px; }
.case-prose .case-closing p:last-child { margin-bottom: 0; }

/* Limits, technical notes, contact */
.case-limits { margin-top: 72px; padding: 24px 28px; background: var(--surface); border: 1px solid var(--line); box-sizing: border-box; }
.case-limits h2 { margin: 0 0 12px; font: 500 12px var(--font-mono); letter-spacing: .12em; text-transform: uppercase; color: var(--teal); }
.case-limits ul { margin: 0; padding-left: 20px; display: flex; flex-direction: column; gap: 8px; font-size: 15px; line-height: 1.6; color: var(--muted); }
.case-limits li strong { color: var(--ink); }
.case-tech { margin-top: 20px; }
.case-details { border: 1px solid var(--line); background: var(--surface); padding: 18px 22px; }
.case-details summary { cursor: pointer; font-weight: 600; line-height: 1.5; }
.case-details p { font-size: 15px; line-height: 1.7; color: var(--muted); }
.case-contact { padding: 72px 0 96px; }
.case-contact h2 { margin: 0 0 14px; font: 600 clamp(26px, 3vw, 30px)/1.2 var(--font-serif); letter-spacing: -.02em; }
.case-contact > p { margin: 0; font-size: 17px; line-height: 1.6; color: var(--muted); }
.case-actions { display: flex; flex-wrap: wrap; align-items: center; gap: 16px 28px; margin-top: 22px; }
.case-actions a { font-weight: 600; text-underline-offset: 5px; }
.case-actions .case-primary { display: inline-flex; align-items: center; min-height: 48px; padding: 0 22px; background: var(--teal); color: #fff; text-decoration: none; border-radius: 3px; }

.case-study :focus-visible { outline: 3px solid var(--teal-bright); outline-offset: 5px; }
.case-study [id] { scroll-margin-top: 24px; }

@media (max-width: 860px) {
  .case-council-steps { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .case-specimens { grid-template-columns: 1fr; }
}

@media (max-width: 600px) {
  .case-column, .case-wrap, .case-wide { width: calc(100% - 32px); }
  .case-hero { padding-bottom: 44px; }
  .case-topline { padding-bottom: 20px; }
  .case-hero h1 { margin-top: 36px; }
  .case-prose { padding-top: 32px; font-size: 17px; line-height: 1.7; }
  .case-main > .case-prose:first-child { padding-top: 44px; }
  .case-prose h2 { font-size: 27px; }
  .case-prose h2.case-section-title { margin-top: 56px; }
  .case-prose h3 { font-size: 23px; }
  .case-pull { font-size: 20px; }
  .case-phase-num { margin-top: 44px !important; }
  .case-table { min-width: 600px; font-size: 13px; }
  .case-table th, .case-table td { padding: 9px 12px; }
  .case-score { --seg: 7px; }
  .case-questions { grid-template-columns: 1fr; gap: 10px; }
  .case-questions strong { font-size: 19px; }
  .case-phases { grid-template-columns: repeat(2, minmax(0, 1fr)); margin-bottom: 36px; }
  .case-phases li { padding-bottom: 12px; border-bottom: 1px solid var(--line); }
  .case-phases small { display: none; }
  .case-council { padding: 18px; gap: 16px; }
  .case-council-steps { grid-template-columns: 1fr; }
  .case-council-label { margin-bottom: -6px; }
  .case-prose .case-closing p { font-size: 19px; }
  .case-limits { margin-top: 48px; padding: 18px; }
  .case-actions .case-primary { width: 100%; justify-content: center; }
  .case-contact { padding: 48px 0 64px; }
  /* 44px tap targets for the back link and the contact links. */
  .case-topline a, .case-actions a:not(.case-primary) { display: inline-flex; align-items: center; min-height: 44px; }
  .case-topline { padding-bottom: 10px; }
}