/* ═══════════════════════════════════════════════════════════════════════
   Case study pages — loaded after style.css, only on project pages.
   ═════════════════════════════════════════════════════════════════════ */

/* ─── Header ─── */
.case__head {
  padding-block: clamp(3rem, 6vw, 5.5rem) clamp(2rem, 4vw, 3rem);
  background: var(--bg-alt);
  border-bottom: 1px solid var(--border);
}
.case__head-inner { max-width: 780px; }

.back-link {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  font-size: var(--step--1);
  font-weight: 600;
  color: var(--text-muted);
  margin-bottom: 2rem;
  transition: color 0.2s var(--ease), gap 0.2s var(--ease);
}
.back-link:hover { color: var(--text); gap: 0.7rem; }

.case__title { font-size: var(--step-3); margin-bottom: 1.1rem; }

.case__lede {
  font-size: var(--step-1);
  color: var(--text-muted);
  max-width: 60ch;
  margin-bottom: 2.5rem;
}

.case__facts {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 1.5rem;
  padding-block: 1.5rem;
  border-block: 1px solid var(--border);
  margin: 0 0 2rem;
}
.case__facts dt {
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-faint);
  margin-bottom: 0.35rem;
}
.case__facts dd { margin: 0; font-weight: 500; font-size: var(--step--1); }

.case__actions { display: flex; flex-wrap: wrap; gap: 0.8rem; }

/* ─── Hero image ─── */
.case__hero {
  margin: clamp(-3rem, -5vw, -2rem) 0 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--border);
  box-shadow: var(--shadow);
}
.case__hero img { width: 100%; }

/* ─── Body prose ─── */
.case__body {
  max-width: 720px;
  padding-block: clamp(3rem, 6vw, 5rem);
  font-size: var(--step-0);
}
.case__body h2 {
  font-size: var(--step-2);
  margin: 3rem 0 1rem;
}
.case__body h2:first-child { margin-top: 0; }
.case__body p { color: var(--text-muted); }

.case__list {
  list-style: none;
  margin: 1.5rem 0;
  color: var(--text-muted);
}
.case__list li {
  position: relative;
  padding-left: 1.6rem;
  margin-bottom: 0.7rem;
}
.case__list li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.62em;
  width: 7px;
  height: 7px;
  border-radius: 2px;
  background: var(--gradient);
}

.case__quote {
  margin: 2.5rem 0;
  padding: 1.75rem 2rem;
  background: var(--surface);
  border: 1px solid var(--border);
  /* A gradient border-image would kill the border-radius, so the accent bar
     is a solid color instead. */
  border-left: 3px solid var(--accent-2);
  border-radius: 0 var(--radius) var(--radius) 0;
}
.case__quote p {
  font-family: var(--font-display);
  font-size: var(--step-1);
  color: var(--text);
  margin-bottom: 0.9rem;
}
.case__quote cite {
  font-style: normal;
  font-size: var(--step--1);
  color: var(--text-faint);
}

/* ─── Result tiles ─── */
.case__stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 1rem;
  margin: 2.5rem 0;
}
.stat {
  padding: 1.5rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  text-align: center;
}
.stat__num {
  display: block;
  font-family: var(--font-display);
  font-size: var(--step-2);
  font-weight: 700;
  letter-spacing: -0.03em;
  background: var(--gradient);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}
.stat__label {
  display: block;
  margin-top: 0.35rem;
  font-size: var(--step--1);
  color: var(--text-muted);
}

/* ─── Next project ─── */
.case__next {
  padding-block: clamp(3rem, 5vw, 4.5rem);
  background: var(--bg-alt);
  border-top: 1px solid var(--border);
}
.case__next-link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  font-family: var(--font-display);
  font-size: var(--step-2);
  font-weight: 700;
  letter-spacing: -0.03em;
  transition: color 0.25s var(--ease);
}
.case__next-link:hover { color: var(--accent-2); }
.case__next-link span:last-child { transition: transform 0.25s var(--ease); }
.case__next-link:hover span:last-child { transform: translateX(8px); }

.footer__note a { text-decoration: underline; text-underline-offset: 3px; }


/* ═══════════════════════════════════════════════════════════════════════
   Case-study content blocks
   ═════════════════════════════════════════════════════════════════════ */

/* ─── Two-column rule comparison ─── */
.rulediff {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 1rem;
  margin: 2.5rem 0;
}
.rulediff__col {
  padding: 1.5rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
}
.rulediff__col--accent {
  border-color: color-mix(in srgb, var(--accent-2) 45%, var(--border));
}
.rulediff__col h3 {
  font-size: var(--step-0);
  margin-bottom: 1rem;
  color: var(--text-faint);
  letter-spacing: 0.04em;
  text-transform: uppercase;
}
.rulediff__col--accent h3 { color: var(--accent-2); }
.rulediff__col ul { list-style: none; }
.rulediff__col li {
  position: relative;
  padding-left: 1.3rem;
  margin-bottom: 0.7rem;
  font-size: var(--step--1);
  color: var(--text-muted);
}
.rulediff__col li:last-child { margin-bottom: 0; }
.rulediff__col li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.62em;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--text-faint);
}
.rulediff__col--accent li::before { background: var(--accent-2); }

/* ─── Board diagram ─── */
:root { --board-light: #ebe3d7; --board-dark: #b08a63; }
:root[data-theme="dark"] { --board-light: #d9cfc0; --board-dark: #8a6647; }

.board-fig { margin: 2.5rem 0; }
.board {
  display: block;
  width: min(360px, 100%);
  margin-inline: auto;
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--border);
}
.board .pc {
  font-size: 40px;
  /* Segoe UI Symbol carries the chess glyphs reliably on Windows */
  font-family: 'Segoe UI Symbol', 'Apple Symbols', 'Noto Sans Symbols 2', serif;
  text-anchor: middle;
}
.board .pc--w { fill: #fff; stroke: #333; stroke-width: 0.6; }
.board .pc--b { fill: #1a1a1a; }
.board .arrow {
  stroke: var(--accent-3);
  stroke-width: 4;
  stroke-linecap: round;
}
.board .arrowhead { fill: var(--accent-3); }

.board-fig figcaption {
  margin-top: 1rem;
  font-size: var(--step--1);
  color: var(--text-muted);
  text-align: center;
  max-width: 52ch;
  margin-inline: auto;
}

/* ─── Spec table ─── */
.spec {
  margin: 2rem 0;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}
.spec__row {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 1rem;
  padding: 0.9rem 1.25rem;
  border-bottom: 1px solid var(--border);
  font-size: var(--step--1);
}
.spec__row:last-child { border-bottom: 0; }
.spec__row:nth-child(odd) { background: var(--surface); }
.spec__row span:first-child { color: var(--text-muted); }
.spec__row span:last-child {
  font-weight: 600;
  text-align: right;
  font-variant-numeric: tabular-nums;
}

/* ─── Callout ─── */
.callout {
  margin: 3rem 0 0;
  padding: 1.75rem 2rem;
  background: var(--surface);
  border: 1px solid color-mix(in srgb, var(--accent-2) 35%, var(--border));
  border-radius: var(--radius);
}
.callout h3 {
  font-size: var(--step-1);
  margin-bottom: 0.6rem;
}
.callout p { color: var(--text-muted); margin: 0; }

/* ─── Inline code ─── */
.case__body code {
  padding: 0.15em 0.4em;
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: 5px;
  font-family: 'Cascadia Code', Consolas, 'SF Mono', monospace;
  font-size: 0.88em;
}