/* Case Studies — page styles. Extends the theme tokens in style.css. */

/* ── Case hero (compact) ─────────────────────────────────────────── */
.cs-hero {
  position: relative;
  padding: clamp(96px, 15vh, 168px) var(--gutter) clamp(48px, 7vh, 80px);
  border-bottom: 1px solid var(--line);
  overflow: hidden;
}
.cs-hero-inner { max-width: var(--max); margin: 0 auto; position: relative; z-index: 2; }
.cs-hero-grid {
  position: absolute; inset: -20px; z-index: 0; pointer-events: none;
  background-image:
    linear-gradient(to right, var(--line) 1px, transparent 1px),
    linear-gradient(to bottom, var(--line) 1px, transparent 1px);
  background-size: 56px 56px;
  mask-image: radial-gradient(ellipse 75% 80% at 20% 20%, #000 20%, transparent 72%);
}
.cs-hero-h1 {
  font-family: var(--font-display);
  font-size: clamp(44px, 8vw, 108px);
  line-height: 0.96; letter-spacing: -0.035em; font-weight: 500;
  margin: 0 0 clamp(20px, 3vh, 32px); max-width: 14ch;
  animation: heroIn 0.9s cubic-bezier(.22,.8,.2,1) both;
}
.cs-hero-h1 .accent-serif {
  font-style: italic; font-family: "Newsreader", Georgia, serif; font-weight: 400;
  color: var(--accent);
}
.cs-hero-sub {
  max-width: 60ch; font-size: clamp(15px, 1.4vw, 18px);
  line-height: 1.6; color: var(--fg-dim); margin: 0 0 clamp(36px, 5vh, 56px);
  text-wrap: pretty;
}
.cs-hero-stats {
  display: grid; grid-template-columns: repeat(4, 1fr);
  gap: 1px; background: var(--line);
  border: 1px solid var(--line); border-radius: 6px; overflow: hidden;
}
@media (max-width: 720px) { .cs-hero-stats { grid-template-columns: repeat(2, 1fr); } }
.cs-hero-stat {
  background: var(--bg-2); padding: 20px 22px;
  display: flex; flex-direction: column; gap: 6px;
  transition: background 0.25s;
}
.cs-hero-stat:hover { background: var(--bg-3); }
.cs-hero-stat .v { font-size: clamp(24px, 2.6vw, 34px); letter-spacing: -0.02em; font-weight: 500; line-height: 1; }
.cs-hero-stat .k { font-size: 10.5px; letter-spacing: 0.1em; text-transform: uppercase; color: var(--fg-faint); }

/* ── Filter bar ──────────────────────────────────────────────────── */
.cs-explorer { background: var(--bg); }
.cs-filters {
  max-width: var(--max); margin: 0 auto clamp(32px, 4vh, 44px);
  display: flex; flex-wrap: wrap; gap: 8px; align-items: center;
}
.cs-filter {
  display: inline-flex; align-items: center; gap: 10px;
  padding: 9px 16px;
  border: 1px solid var(--line); border-radius: 999px;
  background: var(--bg-2); color: var(--fg-dim);
  font-size: 13px; font-family: var(--font-display);
  transition: border-color 0.18s, color 0.18s, background 0.18s;
}
.cs-filter:hover { color: var(--fg); border-color: var(--line-strong); }
.cs-filter.active { color: #0A0A0B; background: var(--accent); border-color: var(--accent); }
.cs-filter .count {
  font-family: var(--font-mono); font-size: 10.5px;
  color: var(--fg-faint); transition: color 0.18s;
}
.cs-filter.active .count { color: rgba(10,10,11,0.55); }

/* ── Master–detail explorer ──────────────────────────────────────── */
.cs-grid {
  max-width: var(--max); margin: 0 auto;
  display: grid; grid-template-columns: 340px 1fr;
  gap: 1px; background: var(--line);
  border: 1px solid var(--line); border-radius: 8px; overflow: hidden;
}
@media (max-width: 940px) {
  .cs-grid { grid-template-columns: 1fr; }
  /* Clears the fixed ticker + sticky nav when a case click smooth-scrolls here. */
  .cs-detail { scroll-margin-top: 80px; }
}

/* Left rail: case list */
.cs-rail { background: var(--bg); display: flex; flex-direction: column; }
.cs-rail-head {
  padding: 14px 20px; border-bottom: 1px solid var(--line);
  display: flex; justify-content: space-between; align-items: center;
  font-size: 10.5px; letter-spacing: 0.12em; text-transform: uppercase; color: var(--fg-faint);
}
.cs-rail-list { display: flex; flex-direction: column; }
.cs-rail-item {
  text-align: left; width: 100%;
  background: transparent; border: 0; border-bottom: 1px solid var(--line);
  color: var(--fg);
  padding: 16px 20px; cursor: pointer;
  display: flex; flex-direction: column; gap: 6px;
  position: relative;
  transition: background 0.2s;
}
.cs-rail-item:last-child { border-bottom: 0; }
.cs-rail-item::before {
  content: ""; position: absolute; left: 0; top: 0; bottom: 0; width: 2px;
  background: var(--accent); transform: scaleY(0); transform-origin: top;
  transition: transform 0.3s cubic-bezier(.22,.8,.2,1);
}
.cs-rail-item:hover { background: var(--bg-2); }
.cs-rail-item.active { background: var(--bg-2); }
.cs-rail-item.active::before { transform: scaleY(1); }
.cs-rail-top { display: flex; justify-content: space-between; align-items: baseline; gap: 12px; }
.cs-rail-client { font-size: 15px; font-weight: 500; letter-spacing: -0.01em; }
.cs-rail-year { font-family: var(--font-mono); font-size: 11px; color: var(--fg-faint); }
.cs-rail-title { font-size: 12.5px; color: var(--fg-dim); line-height: 1.4; }
.cs-rail-sector { font-family: var(--font-mono); font-size: 10px; letter-spacing: 0.1em; text-transform: uppercase; color: var(--fg-faint); }

/* Right: detail panel */
.cs-detail { background: var(--bg-2); position: relative; min-width: 0; }
.cs-detail-inner { padding: clamp(28px, 3.5vw, 44px); }

.cs-detail-head { display: flex; flex-wrap: wrap; gap: 16px 24px; align-items: baseline; justify-content: space-between; margin-bottom: 8px; }
.cs-detail-meta { display: flex; gap: 18px; font-family: var(--font-mono); font-size: 11px; color: var(--fg-faint); flex-wrap: wrap; }
.cs-detail-meta i { width: 5px; height: 5px; border-radius: 50%; background: var(--accent); display: inline-block; margin-right: 7px; vertical-align: middle; }
.cs-tags { display: flex; flex-wrap: wrap; gap: 6px; margin: 16px 0 4px; }
.cs-tag {
  font-family: var(--font-mono); font-size: 10.5px; letter-spacing: 0.06em;
  padding: 5px 10px; border: 1px solid var(--line); border-radius: 999px;
  color: var(--fg-dim); background: var(--bg);
}
.cs-detail-client { font-size: 13px; color: var(--fg-dim); }
.cs-detail-client b { color: var(--fg); font-weight: 500; }
.cs-detail-title {
  font-size: clamp(24px, 3vw, 38px); line-height: 1.08;
  letter-spacing: -0.02em; font-weight: 500; margin: 12px 0 0; max-width: 22ch;
}

/* Big headline metric */
.cs-headline {
  display: flex; align-items: baseline; gap: 14px;
  margin: 24px 0; padding: 20px 24px;
  border: 1px solid var(--line); border-radius: 6px;
  background: var(--bg);
}
.cs-headline .v { font-size: clamp(32px, 4vw, 52px); letter-spacing: -0.03em; font-weight: 500; line-height: 1; color: var(--accent); }
.cs-headline .k { font-family: var(--font-mono); font-size: 11px; letter-spacing: 0.1em; text-transform: uppercase; color: var(--fg-dim); }

/* Challenge / Approach / Solution blocks */
.cs-blocks { display: flex; flex-direction: column; gap: 28px; margin-top: 8px; }
.cs-block-label {
  display: inline-flex; align-items: center; gap: 10px;
  font-family: var(--font-mono); font-size: 10.5px; letter-spacing: 0.14em;
  text-transform: uppercase; color: var(--fg-faint); margin-bottom: 12px;
}
.cs-block-label .bar { width: 18px; height: 1px; background: var(--accent); }
.cs-block-body { font-size: 15px; line-height: 1.62; color: var(--fg-dim); max-width: 64ch; text-wrap: pretty; }
.cs-block-body b { color: var(--fg); font-weight: 500; }
.cs-steps { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 12px; }
.cs-steps li {
  display: grid; grid-template-columns: 28px 1fr; gap: 14px; align-items: start;
  font-size: 14.5px; line-height: 1.55; color: var(--fg-dim);
}
.cs-steps .n {
  font-family: var(--font-mono); font-size: 11px; color: var(--accent);
  border: 1px solid var(--line); border-radius: 4px;
  width: 26px; height: 26px; display: grid; place-items: center; background: var(--bg);
}

/* Results row */
.cs-results {
  display: grid; grid-template-columns: repeat(3, 1fr); gap: 1px;
  background: var(--line); border: 1px solid var(--line); border-radius: 6px; overflow: hidden;
  margin-top: 4px;
}
@media (max-width: 520px) { .cs-results { grid-template-columns: 1fr; } }
.cs-result { background: var(--bg); padding: 18px 20px; display: flex; flex-direction: column; gap: 6px; transition: background 0.2s; }
.cs-result:hover { background: var(--bg-2); }
.cs-result .v { font-size: clamp(22px, 2.4vw, 30px); letter-spacing: -0.02em; font-weight: 500; line-height: 1; }
.cs-result .k { font-family: var(--font-mono); font-size: 10px; letter-spacing: 0.08em; text-transform: uppercase; color: var(--fg-faint); }

/* Stack chips */
.cs-stack { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 4px; }
.cs-stack-chip {
  font-size: 12.5px; padding: 7px 13px;
  border: 1px solid var(--line); border-radius: 999px; background: var(--bg); color: var(--fg);
  display: inline-flex; align-items: center; gap: 8px;
}
.cs-stack-chip i { width: 5px; height: 5px; border-radius: 50%; background: var(--accent); opacity: 0.8; }

/* Detail fade-swap animation — re-triggered by JS on panel switch */
.cs-detail-panel[hidden] { display: none; }
.cs-detail-panel.swap-in .cs-detail-inner { animation: csSwap 0.45s cubic-bezier(.22,.8,.2,1) both; }
@keyframes csSwap { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: none; } }

/* ── By the numbers band ─────────────────────────────────────────── */
.cs-numbers { background: var(--bg-2); }
.cs-numbers-grid {
  max-width: var(--max); margin: 0 auto;
  display: grid; grid-template-columns: repeat(4, 1fr); gap: clamp(20px, 3vw, 48px);
}
@media (max-width: 820px) { .cs-numbers-grid { grid-template-columns: repeat(2, 1fr); } }
.cs-number { display: flex; flex-direction: column; gap: 10px; padding-top: 24px; border-top: 1px solid var(--line-strong); }
.cs-number .big { font-size: clamp(40px, 5vw, 68px); letter-spacing: -0.03em; line-height: 0.95; font-weight: 500; }
.cs-number .big .u { color: var(--accent); }
.cs-number .k { font-family: var(--font-mono); font-size: 11px; letter-spacing: 0.1em; text-transform: uppercase; color: var(--fg); }
.cs-number .d { font-size: 13px; color: var(--fg-dim); line-height: 1.5; max-width: 26ch; }

/* ── CTA band ────────────────────────────────────────────────────── */
.cs-cta { border-bottom: 1px solid var(--line); }
.cs-cta-inner {
  max-width: var(--max); margin: 0 auto;
  display: grid; grid-template-columns: 1.3fr 1fr; gap: clamp(32px, 5vw, 72px); align-items: center;
}
@media (max-width: 820px) { .cs-cta-inner { grid-template-columns: 1fr; } }
.cs-cta-title { font-size: clamp(30px, 4.5vw, 60px); line-height: 1.02; letter-spacing: -0.025em; font-weight: 500; margin: 16px 0 0; white-space: pre-line; }
.cs-cta-sub { font-size: clamp(15px, 1.2vw, 17px); color: var(--fg-dim); line-height: 1.6; margin: 20px 0 0; max-width: 46ch; }
.cs-cta-actions { display: flex; justify-content: flex-end; }
@media (max-width: 820px) { .cs-cta-actions { justify-content: flex-start; } }