/* INSART AI Practice — case study template (shared) */
:root {
  --bg: #0a0f1e;
  --bg2: #0d1427;
  --bg3: #111b35;
  --n700: #162140;
  --n600: #1e2d52;
  --n500: #2a3d6e;
  --s50: #f8f9fb;
  --s200: #e2e6ef;
  --s300: #c8d0e0;
  --s400: #8f9ab8;
  --s500: #5a6480;
  --accent: #e07b35;
  --accent-lt: #f09050;
  --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html {
  scroll-behavior: smooth;
  overflow-x: hidden;
}

body {
  background: var(--bg);
  color: var(--s50);
  font-family: var(--font);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

a { color: var(--accent); text-decoration: none; }
a:hover { color: var(--accent-lt); }

@keyframes cs-header-in {
  from {
    opacity: 0;
    transform: translateY(-12px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes cs-hero-veil {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.92; }
}

@keyframes cs-metric-glow {
  0%, 100% { box-shadow: 0 0 0 0 rgba(224, 123, 53, 0); }
  50% { box-shadow: 0 0 24px -8px rgba(224, 123, 53, 0.12); }
}

.cs-header {
  position: sticky;
  top: 0;
  z-index: 40;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 14px 28px;
  background: rgba(10, 15, 30, 0.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--n700);
  animation: cs-header-in 0.55s cubic-bezier(0.22, 1, 0.36, 1) both;
}

.cs-back {
  font-size: 13px;
  font-weight: 500;
  color: var(--s300);
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.cs-back:hover { color: var(--s50); }

.cs-cta-head {
  font-size: 13px;
  font-weight: 500;
  padding: 8px 18px;
  background: var(--accent);
  color: #fff;
  border-radius: 2px;
}

.cs-cta-head:hover { background: var(--accent-lt); color: #fff; }

.cs-hero {
  position: relative;
  min-height: 52vh;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  align-items: center;
  text-align: center;
  padding: 48px 28px 88px;
  background-size: cover;
  background-position: center;
}

.cs-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(
    to top,
    rgba(10, 15, 30, 0.97) 0%,
    rgba(10, 15, 30, 0.55) 45%,
    rgba(10, 15, 30, 0.35) 100%
  );
  animation: cs-hero-veil 8s ease-in-out infinite;
}

.cs-hero-inner {
  position: relative;
  z-index: 3;
  width: 100%;
  max-width: 900px;
  margin-left: auto;
  margin-right: auto;
}

.cs-kicker {
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 14px;
}

.cs-h1 {
  font-size: clamp(32px, 4.2vw, 48px);
  font-weight: 300;
  line-height: 1.08;
  letter-spacing: -0.02em;
  margin-bottom: 16px;
}

.cs-lede {
  font-size: 17px;
  font-weight: 300;
  color: var(--s300);
  max-width: 640px;
  margin-left: auto;
  margin-right: auto;
}

.cs-wrap {
  max-width: 900px;
  margin: 0 auto;
  padding: 0 28px 80px;
}

.cs-metrics {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
  margin: 0 0 48px;
  position: relative;
  z-index: 1;
}

.cs-metric {
  background: var(--bg2);
  border: 1px solid var(--n700);
  padding: 18px 16px;
  text-align: center;
  transition: border-color 0.25s, transform 0.35s cubic-bezier(0.22, 1, 0.36, 1);
}

.cs-metric:hover {
  border-color: var(--n500);
  transform: translateY(-2px);
}

html.cs-anim .cs-metrics .cs-metric.cs-reveal-in:nth-child(1) { animation: cs-metric-glow 4s ease-in-out 0.3s infinite; }
html.cs-anim .cs-metrics .cs-metric.cs-reveal-in:nth-child(2) { animation: cs-metric-glow 4s ease-in-out 0.8s infinite; }
html.cs-anim .cs-metrics .cs-metric.cs-reveal-in:nth-child(3) { animation: cs-metric-glow 4s ease-in-out 1.3s infinite; }
html.cs-anim .cs-metrics .cs-metric.cs-reveal-in:nth-child(4) { animation: cs-metric-glow 4s ease-in-out 1.8s infinite; }

.cs-metric-val {
  display: block;
  font-size: 26px;
  font-weight: 300;
  letter-spacing: -0.02em;
  color: var(--s50);
  line-height: 1.1;
}

.cs-metric-val em {
  font-style: normal;
  color: var(--accent);
  font-size: 0.85em;
}

.cs-metric-lbl {
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--s500);
  margin-top: 6px;
}

.cs-section {
  margin-bottom: 44px;
}

.cs-section h2 {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 14px;
}

.cs-section p,
.cs-section li {
  font-size: 15px;
  font-weight: 300;
  color: var(--s400);
  margin-bottom: 12px;
}

.cs-section ul {
  padding-left: 1.2em;
  margin-top: 8px;
}

.cs-two {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
}

.cs-panel {
  background: var(--bg2);
  border: 1px solid var(--n700);
  padding: 22px 24px;
  transition: border-color 0.25s, box-shadow 0.35s;
}

.cs-panel:hover {
  border-color: var(--n500);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.22);
}

.cs-panel h3 {
  font-size: 15px;
  font-weight: 500;
  color: var(--s200);
  margin-bottom: 10px;
}

.cs-components {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 12px;
}

.cs-comp {
  border: 1px solid var(--n600);
  padding: 16px 18px;
  background: rgba(17, 27, 53, 0.5);
  transition: border-color 0.25s, transform 0.3s cubic-bezier(0.22, 1, 0.36, 1);
}

.cs-comp:hover {
  border-color: rgba(224, 123, 53, 0.35);
  transform: translateY(-2px);
}

.cs-comp strong {
  display: block;
  font-size: 13px;
  font-weight: 500;
  color: var(--s200);
  margin-bottom: 6px;
}

.cs-comp span {
  font-size: 13px;
  font-weight: 300;
  color: var(--s500);
  line-height: 1.45;
}

.cs-timeline {
  border-left: 1px solid var(--n600);
  padding-left: 22px;
  margin-left: 8px;
}

.cs-tl-item {
  position: relative;
  padding-bottom: 22px;
}

.cs-tl-item::before {
  content: "";
  position: absolute;
  left: -27px;
  top: 4px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--accent);
  border: 2px solid var(--bg);
}

.cs-tl-item h4 {
  font-size: 14px;
  font-weight: 500;
  color: var(--s200);
  margin-bottom: 4px;
}

.cs-tl-item p {
  font-size: 14px;
  color: var(--s400);
  margin: 0;
}

.cs-quote {
  border-left: 3px solid var(--accent);
  padding: 8px 0 8px 22px;
  margin: 32px 0;
}

.cs-quote p {
  font-size: 17px;
  font-weight: 300;
  font-style: italic;
  color: var(--s300);
  margin-bottom: 10px;
}

.cs-quote cite {
  font-size: 13px;
  font-style: normal;
  color: var(--s500);
}

.cs-gallery {
  display: grid;
  grid-template-columns: 2fr 1fr;
  gap: 10px;
  margin: 24px 0 8px;
}

.cs-gallery img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  border-radius: 4px;
  border: 1px solid var(--n700);
  min-height: 140px;
  transition: transform 0.45s cubic-bezier(0.22, 1, 0.36, 1), border-color 0.25s;
}

.cs-gallery img:hover {
  transform: scale(1.03);
  border-color: var(--n500);
}

.cs-gallery-col {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.cs-gallery-col img { min-height: 65px; flex: 1; }

.cs-disclaimer {
  font-size: 12px;
  font-weight: 300;
  color: var(--s500);
  border-top: 1px solid var(--n700);
  padding-top: 24px;
  margin-top: 40px;
}

.cs-footer-cta {
  margin-top: 32px;
  padding: 28px;
  background: var(--bg2);
  border: 1px solid var(--n700);
  text-align: center;
}

.cs-footer-cta p {
  font-size: 15px;
  color: var(--s400);
  margin-bottom: 16px;
}

.cs-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 24px;
  background: var(--accent);
  color: #fff;
  font-size: 14px;
  font-weight: 500;
  border: none;
  cursor: pointer;
  text-decoration: none;
}

.cs-btn:hover { background: var(--accent-lt); color: #fff; }

/* ─── Scroll reveal (enabled when case-study.js adds .cs-anim to <html>) ─── */
@media (prefers-reduced-motion: no-preference) {
  html.cs-anim .cs-hero-inner > *:not(.cs-reveal-in),
  html.cs-anim .cs-wrap > *:not(.cs-reveal-in),
  html.cs-anim .cs-metrics .cs-metric:not(.cs-reveal-in) {
    opacity: 0;
    transform: translateY(26px);
    transition:
      opacity 0.65s cubic-bezier(0.22, 1, 0.36, 1),
      transform 0.65s cubic-bezier(0.22, 1, 0.36, 1);
    transition-delay: var(--cs-d, 0s);
  }

  html.cs-anim .cs-reveal-in {
    opacity: 1;
    transform: none;
  }
}

@media (max-width: 720px) {
  .cs-metrics { grid-template-columns: repeat(2, 1fr); }
  .cs-two { grid-template-columns: 1fr; }
  .cs-gallery { grid-template-columns: 1fr; }
  .cs-header {
    flex-wrap: wrap;
    row-gap: 10px;
    padding: 12px max(16px, env(safe-area-inset-left)) 12px max(16px, env(safe-area-inset-right));
    padding-top: max(12px, env(safe-area-inset-top));
  }
  .cs-back { max-width: min(100%, 58vw); line-height: 1.35; }
  .cs-cta-head { margin-left: auto; }
  .cs-hero { min-height: 46vh; padding: 32px max(16px, env(safe-area-inset-left)) 56px max(16px, env(safe-area-inset-right)); }
  .cs-wrap { padding: 0 max(16px, env(safe-area-inset-left)) 64px max(16px, env(safe-area-inset-right)); }
  .cs-h1 { font-size: clamp(26px, 6.5vw, 40px); }
  .cs-lede { font-size: 15px; }
  .cs-metric { padding: 14px 10px; }
  .cs-metric-val { font-size: 22px; }
  .cs-metric-lbl { font-size: 9px; letter-spacing: 0.1em; }
  .cs-components { grid-template-columns: 1fr; }
  .cs-timeline { margin-left: 4px; padding-left: 18px; }
  .cs-tl-item::before { left: -23px; }
  .cs-footer-cta { padding: 22px 16px; }
}

@media (max-width: 380px) {
  .cs-metrics { grid-template-columns: 1fr; }
  .cs-header { flex-direction: column; align-items: stretch; }
  .cs-back { max-width: none; }
  .cs-cta-head {
    margin-left: 0;
    text-align: center;
    justify-content: center;
    display: inline-flex;
    align-self: center;
    width: 100%;
    box-sizing: border-box;
  }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .cs-header { animation: none; }
  .cs-hero::before { animation: none; }
  html.cs-anim .cs-metric { animation: none !important; }
}