/* ============================================================
   O&A CONSULTING — case study template
   ============================================================ */
:root {
  --bg:        #0a0b0e;
  --bg-warm:   #0e0f13;
  --surface:   #14161c;
  --surface-2: #1a1d25;
  --edge:      rgba(227, 176, 75, 0.14);
  --edge-soft: rgba(236, 231, 221, 0.08);
  --fg:        #ece7dd;
  --fg-soft:   #b9b4aa;
  --muted:     #7d818c;
  --gold:      #e3b04b;
  --gold-hi:   #f2d494;
  --gold-deep: #8f6c1f;
  --green:     #4ec98a;
  --red:       #e5645a;
  --display: "Fraunces", "Didot", "Bodoni 72", Georgia, serif;
  --sans: "Inter", "Avenir Next", "Helvetica Neue", -apple-system, sans-serif;
  --mono: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  --ease-out: cubic-bezier(0.22, 1, 0.36, 1);
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  background: var(--bg);
  color: var(--fg);
  font-family: var(--sans);
  font-weight: 300;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
::selection { background: var(--gold); color: #0a0b0e; }
body::after {
  content: "";
  position: fixed; inset: 0;
  pointer-events: none;
  z-index: 999;
  opacity: 0.035;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='160' height='160'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.9' numOctaves='2'/%3E%3C/filter%3E%3Crect width='160' height='160' filter='url(%23n)'/%3E%3C/svg%3E");
}
a { color: inherit; text-decoration: none; }
.wrap { max-width: 1080px; margin: 0 auto; padding: 0 clamp(20px, 5vw, 64px); }

/* header */
header {
  position: fixed; top: 0; left: 0; right: 0;
  z-index: 100;
  padding: 18px 0;
  background: rgba(10, 11, 14, 0.82);
  backdrop-filter: blur(18px);
  -webkit-backdrop-filter: blur(18px);
  box-shadow: 0 1px 0 var(--edge-soft);
}
.nav { display: flex; align-items: center; justify-content: space-between; }
.brand { font-family: var(--display); font-size: 20px; font-weight: 400; }
.brand em { font-style: italic; color: var(--gold); }
.nav-links { display: flex; gap: 30px; align-items: center; }
.nav-links a {
  font-size: 12px; letter-spacing: 0.14em; text-transform: uppercase;
  color: var(--fg-soft); transition: color 0.3s;
}
.nav-links a:hover { color: var(--gold-hi); }

/* hero */
.case-hero { padding: clamp(140px, 20vh, 200px) 0 clamp(40px, 6vh, 70px); }
.kicker {
  font-family: var(--mono);
  font-size: 11.5px; letter-spacing: 0.28em; text-transform: uppercase;
  color: var(--gold);
  display: flex; align-items: center; gap: 14px;
  margin-bottom: 26px;
}
.kicker::before { content: ""; width: 42px; height: 1px; background: var(--gold); opacity: 0.6; }
h1 {
  font-family: var(--display);
  font-size: clamp(42px, 7vw, 84px);
  font-weight: 300;
  line-height: 1.05;
  letter-spacing: -0.015em;
  max-width: 900px;
}
h1 em {
  font-style: italic;
  background: linear-gradient(105deg, var(--gold-hi) 0%, var(--gold) 45%, var(--gold-deep) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
}
.lede {
  max-width: 640px;
  margin-top: 30px;
  font-size: clamp(16px, 1.7vw, 19.5px);
  color: var(--fg-soft);
  line-height: 1.75;
}
.meta-chips { display: flex; flex-wrap: wrap; gap: 8px; margin-top: 34px; }
.meta-chips span {
  font-family: var(--mono);
  font-size: 10.5px; letter-spacing: 0.1em; text-transform: uppercase;
  color: var(--muted);
  border: 1px solid var(--edge-soft);
  padding: 7px 14px; border-radius: 100px;
}

/* media band */
.media-band { padding: clamp(30px, 5vh, 60px) 0; }
.media-band figure {
  border-radius: 8px; overflow: hidden;
  border: 1px solid var(--edge-soft);
  background: var(--surface);
  box-shadow: 0 40px 90px -40px rgba(0,0,0,0.85);
}
.media-band img, .media-band video { width: 100%; display: block; }
.media-band figcaption {
  font-size: 12px; color: var(--muted);
  padding: 14px 18px;
  border-top: 1px solid var(--edge-soft);
  letter-spacing: 0.04em;
}

/* sections */
section.cs { padding: clamp(56px, 9vh, 110px) 0; }
section.cs.tint { background: var(--bg-warm); }
.sec-label {
  font-family: var(--mono);
  font-size: 11px; letter-spacing: 0.28em; text-transform: uppercase;
  color: var(--gold);
  display: flex; align-items: baseline; gap: 12px;
  margin-bottom: 20px;
}
.sec-label .num { color: var(--muted); }
h2 {
  font-family: var(--display);
  font-size: clamp(28px, 4vw, 44px);
  font-weight: 300;
  line-height: 1.15;
  max-width: 680px;
  margin-bottom: 28px;
}
h2 em { font-style: italic; color: var(--gold); }
.prose { max-width: 680px; }
.prose p { color: var(--fg-soft); font-size: 15.5px; margin-bottom: 18px; }
.prose strong { color: var(--fg); font-weight: 500; }
.prose a { color: var(--gold-hi); border-bottom: 1px solid rgba(227,176,75,0.35); }

.pull {
  font-family: var(--display);
  font-style: italic;
  font-size: clamp(20px, 2.6vw, 28px);
  font-weight: 300;
  color: var(--gold-hi);
  border-left: 1px solid var(--gold);
  padding-left: 22px;
  margin: 36px 0;
  max-width: 620px;
  line-height: 1.5;
}

/* stats band */
.stats { display: grid; grid-template-columns: repeat(4, 1fr); gap: 0; border-top: 1px solid var(--edge-soft); margin-top: 20px; }
@media (max-width: 760px) { .stats { grid-template-columns: repeat(2, 1fr); } }
.stat { padding: 26px 22px 28px 0; border-bottom: 1px solid var(--edge-soft); }
.stat strong {
  display: block;
  font-family: var(--display);
  font-size: clamp(26px, 3vw, 38px);
  font-weight: 300;
  color: var(--fg);
}
.stat strong .accent { color: var(--gold); }
.stat span { font-size: 12.5px; color: var(--muted); letter-spacing: 0.04em; }

/* two-col feature grid */
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 22px; }
.grid-3 { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
@media (max-width: 820px) { .grid-2, .grid-3 { grid-template-columns: 1fr; } }
.card {
  background: var(--surface);
  border: 1px solid var(--edge-soft);
  border-radius: 8px;
  padding: 26px 28px;
  transition: transform 0.5s var(--ease-out), border-color 0.4s;
}
.card:hover { transform: translateY(-4px); border-color: var(--edge); }
.card .c-tag {
  font-family: var(--mono);
  font-size: 10px; letter-spacing: 0.2em; text-transform: uppercase;
  color: var(--gold);
}
.card h3 { font-family: var(--display); font-weight: 400; font-size: 19px; margin: 12px 0 8px; }
.card p { font-size: 13.5px; color: var(--fg-soft); line-height: 1.65; }
.card p code, .prose code {
  font-family: var(--mono); font-size: 0.85em;
  background: var(--surface-2);
  border: 1px solid var(--edge-soft);
  padding: 1px 6px; border-radius: 4px;
  color: var(--gold-hi);
}

/* numbered pipeline steps */
.steps { counter-reset: step; max-width: 760px; }
.step {
  display: grid; grid-template-columns: 64px 1fr; gap: 20px;
  padding: 24px 0;
  border-top: 1px solid var(--edge-soft);
}
.step::before {
  counter-increment: step;
  content: "0" counter(step);
  font-family: var(--display);
  font-style: italic;
  font-size: 30px;
  color: var(--gold);
  opacity: 0.85;
  line-height: 1.1;
}
.step h3 { font-family: var(--display); font-weight: 400; font-size: 20px; margin-bottom: 6px; }
.step p { font-size: 14px; color: var(--fg-soft); }
.step p code { font-family: var(--mono); font-size: 0.85em; color: var(--gold-hi); }

/* highlight / callout box */
.callout {
  background:
    radial-gradient(ellipse at 20% 0%, rgba(227,176,75,0.08), transparent 60%),
    var(--surface);
  border: 1px solid var(--edge);
  border-radius: 10px;
  padding: clamp(28px, 4vw, 44px);
  margin-top: 44px;
}
.callout .c-tag {
  font-family: var(--mono);
  font-size: 10.5px; letter-spacing: 0.24em; text-transform: uppercase;
  color: var(--gold);
}
.callout h3 {
  font-family: var(--display);
  font-weight: 300;
  font-size: clamp(22px, 2.6vw, 30px);
  margin: 14px 0 12px;
  line-height: 1.25;
}
.callout h3 em { font-style: italic; color: var(--gold); }
.callout p { color: var(--fg-soft); font-size: 14.5px; max-width: 720px; }
.callout ul { list-style: none; margin-top: 18px; display: grid; grid-template-columns: 1fr 1fr; gap: 4px 28px; }
@media (max-width: 760px) { .callout ul { grid-template-columns: 1fr; } }
.callout li {
  font-size: 13.5px; color: var(--fg-soft);
  padding: 9px 0 9px 22px;
  border-top: 1px solid var(--edge-soft);
  position: relative;
}
.callout li::before { content: "—"; position: absolute; left: 0; color: var(--gold); }
.callout li strong { color: var(--fg); font-weight: 500; }

/* figure inside sections */
.figure {
  margin: 40px 0 8px;
  border-radius: 8px; overflow: hidden;
  border: 1px solid var(--edge-soft);
  background: var(--surface);
}
.figure img { width: 100%; display: block; }
.figure figcaption {
  font-size: 12px; color: var(--muted);
  padding: 13px 18px;
  border-top: 1px solid var(--edge-soft);
  letter-spacing: 0.04em;
}

/* CTA */
.cta {
  text-align: center;
  padding: clamp(80px, 12vh, 130px) 0;
  background:
    radial-gradient(ellipse 70% 90% at 50% 110%, rgba(227,176,75,0.09), transparent 60%),
    var(--bg-warm);
  border-top: 1px solid var(--edge-soft);
}
.cta h2 { margin: 0 auto 8px; max-width: none; }
.cta p { color: var(--muted); font-size: 14px; }
.cta .big-mail {
  display: inline-block;
  margin-top: 30px;
  font-family: var(--display);
  font-size: clamp(22px, 3.6vw, 40px);
  font-weight: 300;
  font-style: italic;
  color: var(--gold-hi);
  border-bottom: 1px solid rgba(227,176,75,0.4);
  padding-bottom: 4px;
}
.cta .next-case {
  display: block;
  margin-top: 44px;
  font-family: var(--mono);
  font-size: 11px; letter-spacing: 0.24em; text-transform: uppercase;
  color: var(--muted);
}
.cta .next-case a { color: var(--gold-hi); }

footer { padding: 30px 0 38px; border-top: 1px solid var(--edge-soft); }
.foot {
  display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 12px;
  font-size: 12px; color: var(--muted); letter-spacing: 0.06em;
}
.foot .brand { font-size: 15px; }

/* reveal */
.reveal {
  opacity: 0;
  transform: translateY(32px);
  transition: opacity 0.9s var(--ease-out), transform 0.9s var(--ease-out);
}
.reveal.in { opacity: 1; transform: none; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition-duration: 0.001s !important; animation-duration: 0.001s !important; }
  .reveal { opacity: 1; transform: none; }
}