:root {
  --pink: #e6007e;
  --blue: #009fe3;
  --teal: #27cfc3;
  --grad: linear-gradient(135deg, #e6007e 0%, #009fe3 100%);
  --dark: #0d0d0d;
  --dark-700: #111111;
  --dark-600: #1a1a1a;
  --dark-500: #242424;
  --dark-400: #2e2e2e;
  --grey-500: #676767;
  --grey-400: #888888;
  --grey-100: #e0e0e0;
  --white: #ffffff;
  --font-display: 'Bebas Neue', 'Arial Black', sans-serif;
  --font-serif:   'EB Garamond', Georgia, serif;  --font-heading: 'Poppins', system-ui, sans-serif;
  --font-body: 'Poppins', system-ui, sans-serif;
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --radius-sm: 4px;
  --radius-lg: 16px;
  --grid-max: 2000px;
  --grid-margin: clamp(24px, 5vw, 80px);
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  background: var(--dark);
  color: var(--grey-100);
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.6;
  overflow-x: hidden;
}

/* ═══════════════════════════════════════════════════════════
   CS-01 — Hero stat banner (case study)
   ═══════════════════════════════════════════════════════════ */

.cs-stat-banner {
  width: 100%;
  background: var(--dark);
  padding: clamp(48px, 6vw, 80px) 0;
  position: relative;
  overflow-x: clip;
  overflow-y: visible;
}

.cs-stat-banner__inner {
  max-width: var(--grid-max);
  margin: 0 auto;
  padding: 0 var(--grid-margin);
}

.cs-stat-banner__grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  align-items: stretch;
  gap: 0;
}

.cs-stat {
  position: relative;
  text-align: center;
  padding: clamp(20px, 3vw, 36px) clamp(16px, 2.5vw, 28px);
}

/* Vertical gradient dividers — desktop row */
.cs-stat:not(:first-child)::before {
  content: '';
  position: absolute;
  left: 0;
  top: 18%;
  bottom: 18%;
  width: 1px;
  background: linear-gradient(
    180deg,
    transparent 0%,
    rgba(230, 0, 126, 0.55) 35%,
    rgba(0, 159, 227, 0.55) 65%,
    transparent 100%
  );
  pointer-events: none;
}

.cs-stat__number-wrap {
  display: inline-flex;
  flex-direction: column;
  align-items: center;
  width: 100%;
  max-width: 100%;
}

.cs-stat__number {
  display: block;
  font-family: var(--font-display);
  font-size: clamp(2.75rem, 7vw, 5.25rem);
  font-weight: 400;
  line-height: 0.95;
  letter-spacing: 0.02em;
  background: var(--grad);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  -webkit-text-fill-color: transparent;
}

.cs-stat__underline {
  display: block;
  width: 100%;
  max-width: min(220px, 85%);
  height: 2px;
  margin-top: clamp(10px, 1.5vw, 14px);
  background: var(--grad);
  border-radius: var(--radius-sm);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 0.65s var(--ease-out);
}

.cs-stat.is-done .cs-stat__underline {
  transform: scaleX(1);
}

.cs-stat__label {
  margin-top: clamp(14px, 2vw, 20px);
  font-family: var(--font-heading);
  font-size: clamp(13px, 1.35vw, 15px);
  font-weight: 500;
  line-height: 1.35;
  color: var(--grey-400);
  max-width: 14em;
  margin-left: auto;
  margin-right: auto;
}

/* Tablet: 2×2 */
@media (max-width: 800px) {
  .cs-stat-banner__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .cs-stat::before {
    display: none;
  }

  /* Vertical between columns in each row */
  .cs-stat:nth-child(2n)::before {
    display: block;
    top: 12%;
    bottom: 12%;
  }

  /* Horizontal between rows */
  .cs-stat:nth-child(-n + 2)::after {
    content: '';
    position: absolute;
    left: 8%;
    right: 8%;
    bottom: 0;
    height: 1px;
    background: linear-gradient(
      90deg,
      transparent 0%,
      rgba(230, 0, 126, 0.5) 30%,
      rgba(0, 159, 227, 0.5) 70%,
      transparent 100%
    );
    pointer-events: none;
  }
}

/* Mobile: single column */
@media (max-width: 500px) {
  .cs-stat-banner__grid {
    grid-template-columns: 1fr;
  }

  .cs-stat::before {
    display: none !important;
  }

  .cs-stat:nth-child(-n + 2)::after {
    display: none;
  }

  .cs-stat:not(:first-child)::after {
    content: '';
    position: absolute;
    left: 0;
    right: 0;
    top: 0;
    height: 1px;
    background: linear-gradient(
      90deg,
      transparent 0%,
      rgba(230, 0, 126, 0.45) 35%,
      rgba(0, 159, 227, 0.45) 65%,
      transparent 100%
    );
    pointer-events: none;
  }
}

@media (prefers-reduced-motion: reduce) {
  .cs-stat__underline {
    transform: scaleX(1);
    transition: none;
  }
}