/* ============================================================
   Case-study template — extends styles.css
   ============================================================ */

/* ---- CS hero (dark) ---------------------------------------- */
.cs-hero {
  position: relative; background: var(--ink); color: var(--ink-text);
  overflow: hidden; isolation: isolate;
  padding: clamp(120px, 16vh, 180px) 0 clamp(40px, 6vh, 64px);
}
.cs-hero::before {
  content: ""; position: absolute; inset: 0; z-index: -2;
  background-image:
    linear-gradient(var(--ink-line2) 1px, transparent 1px),
    linear-gradient(90deg, var(--ink-line2) 1px, transparent 1px);
  background-size: 64px 64px;
  -webkit-mask-image: radial-gradient(110% 80% at 80% 0%, #000 35%, transparent 76%);
          mask-image: radial-gradient(110% 80% at 80% 0%, #000 35%, transparent 76%);
}
.cs-hero::after {
  content: ""; position: absolute; z-index: -1; width: 620px; height: 620px;
  right: -140px; top: -200px;
  background: radial-gradient(circle, color-mix(in oklab, var(--accent) 38%, transparent), transparent 62%);
  filter: blur(20px); opacity: .5;
}
.breadcrumb {
  display: flex; align-items: center; gap: 10px; flex-wrap: wrap;
  font-family: "Geist Mono", monospace; font-size: 12px; letter-spacing: .04em;
  color: var(--ink-mut); margin-bottom: 26px;
}
.breadcrumb a { color: var(--ink-mut); }
.breadcrumb a:hover { color: var(--ink-text); }
.breadcrumb .sep { opacity: .5; }
.breadcrumb .cur { color: var(--accent-2); }
.cs-top {
  display: grid; grid-template-columns: 1.3fr .7fr; gap: clamp(28px, 5vw, 64px);
  align-items: end;
}
.cs-cat {
  display: inline-flex; align-items: center; gap: 8px;
  font-family: "Geist Mono", monospace; font-size: 11px; letter-spacing: .08em;
  text-transform: uppercase; padding: 6px 12px; border-radius: 7px;
  background: rgba(124,92,255,.14); color: var(--accent-2);
  border: 1px solid rgba(124,92,255,.3); margin-bottom: 22px;
}
.cs-title {
  font-size: clamp(36px, 5.6vw, 76px); line-height: .98; letter-spacing: -.035em;
  font-weight: 600; text-wrap: balance;
}
.cs-summary { font-size: clamp(16px, 1.8vw, 19px); color: var(--ink-mut); line-height: 1.55; margin-top: 22px; max-width: 44ch; }
.cs-summary b { color: var(--ink-text); font-weight: 500; }
.cs-hero-meta { display: flex; flex-direction: column; gap: 1px; }
.cs-hero-meta .row {
  display: flex; justify-content: space-between; align-items: baseline; gap: 16px;
  padding: 14px 2px; border-bottom: 1px solid var(--ink-line2);
}
.cs-hero-meta .row:first-child { border-top: 1px solid var(--ink-line2); }
.cs-hero-meta .k {
  font-family: "Geist Mono", monospace; font-size: 11px; letter-spacing: .08em;
  text-transform: uppercase; color: var(--ink-mut); white-space: nowrap;
}
.cs-hero-meta .v { font-size: 14.5px; font-weight: 500; text-align: right; }

/* big hero image */
.cs-hero-img {
  position: relative; margin-top: clamp(40px, 6vh, 64px);
  border-radius: 16px; overflow: hidden;
  border: 1px solid var(--ink-line); box-shadow: 0 40px 90px -40px rgba(0,0,0,.8);
}
.cs-hero-img img {
  width: 100%; display: block;
  object-fit: cover;
}

/* ---- Body sections ----------------------------------------- */
.cs-body { background: var(--bg); }
.cs-section { padding: clamp(56px, 8vh, 104px) 0; }
.cs-section.tight { padding-top: clamp(20px, 4vh, 48px); }

/* overview: sticky aside + prose */
.cs-overview { display: grid; grid-template-columns: 240px 1fr; gap: clamp(32px, 5vw, 80px); align-items: start; }
.cs-aside { position: sticky; top: 92px; display: flex; flex-direction: column; gap: 22px; }
.cs-aside .blk .k {
  font-family: "Geist Mono", monospace; font-size: 11px; letter-spacing: .09em;
  text-transform: uppercase; color: var(--text-dim); margin-bottom: 8px;
}
.cs-aside .blk .v { font-size: 15px; color: var(--text); line-height: 1.5; }
.cs-aside .blk .tags { display: flex; flex-wrap: wrap; gap: 6px; }
.cs-aside .blk .tags span {
  font-size: 12.5px; padding: 5px 10px; border-radius: 8px;
  background: var(--card); border: 1px solid var(--border); color: var(--text-mut);
}
.cs-prose { max-width: 64ch; }
.cs-lede { font-size: clamp(20px, 2.4vw, 26px); line-height: 1.4; letter-spacing: -.015em; font-weight: 450; color: var(--text); }
.cs-lede em { font-family: "Caveat", cursive; font-style: normal; color: var(--accent); font-size: 1.1em; }
.cs-prose p { font-size: clamp(16px, 1.7vw, 18px); line-height: 1.75; color: var(--text-mut); margin-top: 22px; }
.cs-prose p b, .cs-prose p strong { color: var(--text); font-weight: 600; }
.cs-prose ul { margin-top: 16px; padding-left: 20px; display: flex; flex-direction: column; gap: 10px; }
.cs-prose li { font-size: clamp(15px, 1.6vw, 17px); line-height: 1.7; color: var(--text-mut); }
.cs-prose li strong { color: var(--text); font-weight: 600; }

.cs-eyebrow {
  font-family: "Geist Mono", monospace; font-size: 12px; letter-spacing: .12em;
  text-transform: uppercase; color: var(--accent); display: flex; align-items: center; gap: 10px;
  margin-bottom: 20px;
}
.cs-eyebrow::before { content: ""; width: 22px; height: 1px; background: var(--accent); }
.cs-h2 { font-size: clamp(26px, 3.4vw, 40px); line-height: 1.1; letter-spacing: -.025em; font-weight: 600; text-wrap: balance; max-width: 22ch; }
.cs-section-head { max-width: 680px; margin-bottom: clamp(32px, 5vh, 52px); }

/* figures */
.cs-figure { margin-top: clamp(28px, 4vh, 44px); }
.cs-figure img { width: 100%; display: block; border-radius: var(--r); border: 1px solid var(--border); box-shadow: var(--shadow); }
.cs-figure figcaption {
  font-family: "Geist Mono", monospace; font-size: 12px; color: var(--text-dim);
  margin-top: 12px; display: flex; align-items: center; gap: 8px;
}
.cs-figure figcaption::before { content: "↳"; color: var(--accent); }

/* process steps */
.cs-steps { display: grid; grid-template-columns: repeat(2, 1fr); gap: 18px; margin-top: clamp(28px,4vh,44px); }
.cs-step {
  position: relative; padding: 26px 24px; border-radius: var(--r);
  background: var(--card); border: 1px solid var(--border); box-shadow: var(--shadow);
  transition: transform .35s var(--ease), border-color .35s, box-shadow .35s;
}
.cs-step:hover { transform: translateY(-4px); border-color: color-mix(in oklab, var(--accent) 35%, var(--border)); box-shadow: var(--shadow-lg); }
.cs-step .n {
  font-family: "Geist Mono", monospace; font-size: 12px; color: var(--accent);
  letter-spacing: .08em; margin-bottom: 14px; display: inline-flex; align-items: center; gap: 8px;
}
.cs-step .n::after { content: ""; flex: 1; height: 1px; width: 28px; background: var(--border); }
.cs-step h4 { font-size: 18px; font-weight: 600; letter-spacing: -.01em; }
.cs-step p { font-size: 14.5px; color: var(--text-mut); line-height: 1.6; margin-top: 8px; }

/* impact metrics (big) */
.cs-impact { background: var(--bg-sub); }
.cs-impact-grid { display: grid; grid-template-columns: repeat(3,1fr); gap: 20px; margin-top: clamp(28px,4vh,44px); }
.cs-stat {
  padding: 30px 28px; border-radius: var(--r); background: var(--card);
  border: 1px solid var(--border); box-shadow: var(--shadow);
}
.cs-stat .big {
  font-size: clamp(36px, 4.4vw, 54px); font-weight: 600; letter-spacing: -.04em;
  line-height: 1; font-variant-numeric: tabular-nums; color: var(--text);
}
.cs-stat .big .up { color: #16A34A; }
[data-theme="dark"] .cs-stat .big .up { color: #4ADE80; }
.cs-stat .lab { font-size: 14px; color: var(--text-mut); margin-top: 14px; line-height: 1.45; }
.cs-stat .sub { font-family: "Geist Mono", monospace; font-size: 11px; letter-spacing: .06em; text-transform: uppercase; color: var(--text-dim); margin-top: 6px; }

/* pull quote */
.cs-quote { padding: clamp(56px,9vh,110px) 0; text-align: center; }
.cs-quote blockquote { max-width: 24ch; margin: 0 auto; font-size: clamp(26px, 4vw, 48px); line-height: 1.15; letter-spacing: -.03em; font-weight: 500; text-wrap: balance; color: var(--text); }
.cs-quote blockquote .sig { font-family: "Caveat", cursive; color: var(--accent); font-weight: 600; }
.cs-quote .by { font-family: "Geist Mono", monospace; font-size: 12px; letter-spacing: .08em; text-transform: uppercase; color: var(--text-dim); margin-top: 28px; }

/* next project (dark) */
.cs-next { display: block; background: var(--ink); color: var(--ink-text); position: relative; overflow: hidden; text-decoration: none; }
.cs-next::after {
  content: ""; position: absolute; width: 560px; height: 560px; right: -160px; bottom: -300px;
  background: radial-gradient(circle, color-mix(in oklab, var(--accent) 36%, transparent), transparent 64%);
  filter: blur(20px); opacity: .45;
}
.cs-next .wrap { position: relative; z-index: 1; padding-top: clamp(56px,9vh,96px); padding-bottom: clamp(56px,9vh,96px); }
.cs-next-row { display: flex; align-items: center; justify-content: space-between; gap: 24px; flex-wrap: wrap; }
.cs-next .lab { font-family: "Geist Mono", monospace; font-size: 12px; letter-spacing: .1em; text-transform: uppercase; color: var(--ink-mut); }
.cs-next-title { font-size: clamp(28px, 4.4vw, 54px); font-weight: 600; letter-spacing: -.03em; margin-top: 14px; display: flex; align-items: center; gap: 18px; }
.cs-next-title .go {
  width: 48px; height: 48px; border-radius: 14px; flex: none; display: grid; place-items: center;
  background: var(--accent); color: #fff; transition: transform .3s var(--ease);
}
.cs-next:hover .cs-next-title .go { transform: translateX(6px) rotate(-8deg); }
.cs-back-btn {
  display: inline-flex; align-items: center; gap: 10px; font-size: 14px; color: var(--ink-mut);
  border: 1px solid var(--ink-line); padding: 13px 20px; border-radius: 10px;
  transition: border-color .3s var(--ease), color .3s, transform .3s; cursor: pointer;
  background: transparent; text-decoration: none;
  font-family: inherit; line-height: 1; appearance: none; -webkit-appearance: none;
}
.cs-back-btn:hover { border-color: var(--ink-text); color: var(--ink-text); transform: translateY(-2px); }

/* Soften the accent glow on a light background */
[data-theme="light"] .cs-hero::after { opacity: .18; }

/* interactive embed */
.cs-embed-section { padding: clamp(40px,6vh,72px) 0; }
.cs-embed-head { max-width: 680px; margin-bottom: clamp(24px,4vh,40px); }
.cs-embed-frame {
  width: 100%; height: clamp(440px,65vh,760px);
  border-radius: var(--r); overflow: hidden;
  border: 1px solid var(--border); box-shadow: var(--shadow-lg);
  position: relative; background: #0a0a0a;
}
.cs-embed-frame iframe {
  width: 100%; height: 100%; border: none; display: block;
}
.cs-embed-actions {
  display: flex; align-items: center; gap: 14px; margin-top: 18px; flex-wrap: wrap;
}
.cs-embed-link {
  display: inline-flex; align-items: center; gap: 8px;
  font-size: 14px; font-weight: 500; color: var(--accent);
  text-decoration: none; padding: 10px 18px;
  border: 1px solid color-mix(in oklab, var(--accent) 35%, var(--border));
  border-radius: 9px; background: color-mix(in oklab, var(--accent) 6%, transparent);
  transition: background .2s, border-color .2s, transform .2s;
}
.cs-embed-link:hover {
  background: color-mix(in oklab, var(--accent) 12%, transparent);
  border-color: color-mix(in oklab, var(--accent) 60%, var(--border));
  transform: translateY(-1px);
}
.cs-embed-link svg { flex-shrink: 0; }
.cs-embed-note {
  font-family: "Geist Mono", monospace; font-size: 11.5px; letter-spacing: .04em;
  color: var(--text-dim); display: flex; align-items: center; gap: 6px;
}
.cs-embed-note::before { content: "ℹ"; color: var(--accent); }

/* responsive */
@media (max-width: 880px) {
  .cs-top { grid-template-columns: 1fr; gap: 28px; }
  .cs-overview { grid-template-columns: 1fr; }
  .cs-aside { position: static; flex-direction: row; flex-wrap: wrap; gap: 28px; }
  .cs-aside .blk { min-width: 140px; }
  .cs-steps { grid-template-columns: 1fr; }
  .cs-impact-grid { grid-template-columns: 1fr 1fr; }
}
@media (max-width: 560px) {
  .cs-impact-grid { grid-template-columns: 1fr; }
}