/* =====================================================================
   CASE STUDIES PAGE  (glass-card UI)
   Hero → 3 platform sections (HVI / Oxmaint / FleetRabbit), each with a
   glass card row + a centered "View All Case Studies" button below.
   Mobile: each row becomes a coverflow swipe carousel.
   ===================================================================== */

.cs-page { overflow-x: hidden; }

.cs-section { padding: clamp(44px, 5vw, 72px) clamp(20px, 4vw, 60px); }
.cs-wrap { max-width: 1200px; margin: 0 auto; }

.grad-blue {
  background: linear-gradient(100deg, #5b8def 0%, #2f6bd8 55%, #6aa0ff 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
}

/* ===================== HERO ===================== */
.cs-hero {
  position: relative;
  overflow: hidden;
  min-height: clamp(440px, 62vh, 700px);
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding-top: clamp(120px, 15vh, 175px);
  padding-bottom: clamp(40px, 5vw, 64px);
  text-align: center;
  border-bottom: 1px solid rgba(90, 120, 180, 0.12);
}
/* background image behind the heading (fully visible) */
.cs-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background: url("../case-study/case-study-pc.jpg") center top / cover no-repeat;
  opacity: 0.14;
  pointer-events: none;
  z-index: 0;
  -webkit-mask-image: linear-gradient(180deg, #000 64%, transparent 100%);
          mask-image: linear-gradient(180deg, #000 64%, transparent 100%);
}
.cs-hero .cs-wrap { position: relative; z-index: 1; }
/* phone-specific hero background image */
@media (max-width: 700px) {
  .cs-hero::before { background-image: url("../case-study/case-study-phone.webp"); background-size: cover; }
}
.cs-eyebrow {
  display: inline-block;
  padding: 8px 18px;
  border-radius: 999px;
  font-family: 'Inter', sans-serif;
  font-size: 0.74rem;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: #2f6bd8;
  background: rgba(91, 141, 239, 0.08);
  border: 1px solid rgba(91, 141, 239, 0.3);
}
.cs-title {
  margin-top: 22px;
  font-family: 'Outfit', sans-serif;
  font-weight: 800;
  font-size: clamp(2.4rem, 5.2vw, 4rem);
  line-height: 1.05;
  letter-spacing: -0.02em;
  color: #16202f;
}
.cs-hero-sub {
  margin: 20px auto 0;
  max-width: 640px;
  font-weight: 300;
  line-height: 1.7;
  font-size: clamp(1rem, 1.3vw, 1.18rem);
  color: #5a6478;
}

/* ===================== SECTIONS ===================== */
.cs-blocks {
  background: #ffffff;
}
.cs-block { margin-bottom: clamp(44px, 5vw, 70px); }
.cs-block:last-child { margin-bottom: 0; }
.cs-shead { margin-bottom: clamp(24px, 3vw, 36px); max-width: 760px; }
.cs-eyebrow-sm {
  font-family: 'Inter', sans-serif;
  font-size: 0.74rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}
.cs-stitle {
  margin-top: 8px;
  font-family: 'Outfit', sans-serif;
  font-weight: 800;
  font-size: clamp(1.7rem, 3vw, 2.4rem);
  letter-spacing: -0.015em;
  color: #16202f;
}
.cs-sdesc {
  margin-top: 12px;
  font-weight: 300;
  line-height: 1.65;
  font-size: clamp(0.98rem, 1.2vw, 1.1rem);
  color: #5a6478;
}

/* ===================== CAROUSEL + GLASS CARDS ===================== */
.cs-carousel { position: relative; }
.cs-arrow, .cs-mnav { display: none; } /* desktop hides carousel controls */
.cs-track {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: clamp(20px, 2.4vw, 30px);
}

.cs-card {
  position: relative;
  display: flex;
  flex-direction: column;
  min-height: 240px;
  padding: clamp(24px, 2.4vw, 32px);
  border-radius: 24px;
  text-decoration: none;
  /* liquid glass */
  background: rgba(255, 255, 255, 0.55);
  border: 1px solid rgba(255, 255, 255, 0.75);
  -webkit-backdrop-filter: blur(16px) saturate(165%);
  backdrop-filter: blur(16px) saturate(165%);
  box-shadow: 0 22px 55px rgba(40, 60, 110, 0.12), inset 0 1px 0 rgba(255, 255, 255, 0.7);
  transition: transform 0.4s cubic-bezier(0.16, 1, 0.3, 1), box-shadow 0.4s ease, border-color 0.3s ease;
}
.cs-card:hover {
  transform: translateY(-6px);
  border-color: rgba(91, 141, 239, 0.4);
  box-shadow: 0 34px 70px rgba(40, 60, 110, 0.2), inset 0 1px 0 rgba(255, 255, 255, 0.8);
}
.cs-card-top { display: flex; align-items: flex-start; justify-content: space-between; }
.cs-clogo {
  width: 50px;
  height: 50px;
  border-radius: 14px;
  display: grid;
  place-items: center;
  background: #ffffff;
  box-shadow: 0 10px 24px rgba(40, 60, 110, 0.14);
  padding: 8px;
}
.cs-clogo img { width: 100%; height: 100%; object-fit: contain; border-radius: 8px; }
.cs-ext { width: 18px; height: 18px; color: #aebccf; transition: color 0.3s ease; }
.cs-card:hover .cs-ext { color: var(--accent, #2f6bd8); }

.cs-cplatform {
  margin-top: 24px;
  font-family: 'Inter', sans-serif;
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}
.cs-ctitle {
  margin-top: 12px;
  font-family: 'Outfit', sans-serif;
  font-weight: 700;
  font-size: 1.18rem;
  line-height: 1.32;
  color: #16202f;
  flex: 1 1 auto;
}
.cs-read {
  align-self: flex-start;
  margin-top: 22px;
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 10px 20px;
  border-radius: 999px;
  border: 1.5px solid var(--accent, #2f6bd8);
  background: transparent;
  color: var(--accent, #2f6bd8);
  font-family: 'Outfit', sans-serif;
  font-weight: 700;
  font-size: 0.86rem;
  transition: background 0.3s ease, color 0.3s ease;
}
.cs-read svg { width: 14px; height: 14px; transition: transform 0.3s ease; }
.cs-card:hover .cs-read { background: var(--accent, #2f6bd8); color: #fff; }
.cs-card:hover .cs-read svg { transform: translateX(3px); }

/* ===================== VIEW ALL (centered, below cards) ===================== */
.cs-viewall { display: flex; justify-content: center; margin-top: clamp(28px, 3vw, 42px); }
.cs-viewall-btn {
  display: inline-flex;
  align-items: center;
  padding: 14px 32px;
  border-radius: 999px;
  background: var(--accent, #2f6bd8);
  color: #fff;
  text-decoration: none;
  font-family: 'Outfit', sans-serif;
  font-weight: 700;
  font-size: 0.98rem;
  box-shadow: 0 14px 30px rgba(15, 23, 42, 0.18);
  transition: transform 0.25s ease, filter 0.25s ease;
}
.cs-viewall-btn:hover { transform: translateY(-2px); filter: brightness(1.1); }

/* ===================== REVEAL ===================== */
.cs-reveal { opacity: 0; transform: translateY(28px); transition: opacity 0.8s cubic-bezier(0.16,1,0.3,1), transform 0.8s cubic-bezier(0.16,1,0.3,1); }
.cs-reveal.in-view { opacity: 1; transform: translateY(0); }
@media (prefers-reduced-motion: reduce) { .cs-reveal { transition: opacity 0.3s ease; transform: none; } }

/* ===================== RESPONSIVE (mobile coverflow) ===================== */
@media (max-width: 820px) {
  .cs-track {
    display: flex;
    gap: 0;
    overflow-x: auto;
    scroll-snap-type: x mandatory;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none;
    padding: 16px 8% 14px;
  }
  .cs-track::-webkit-scrollbar { display: none; }
  .cs-card {
    flex: 0 0 80%;
    margin: 0 6px;
    scroll-snap-align: center;
    will-change: transform;
    transition: none;
  }
  .cs-arrow {
    display: grid;
    place-items: center;
    position: absolute;
    top: 42%;
    width: 48px;
    height: 48px;
    border-radius: 50%;
    border: none;
    background: #fff;
    color: #2f6bd8;
    box-shadow: 0 10px 26px rgba(40, 60, 110, 0.22);
    cursor: pointer;
    z-index: 6;
    transform: translateY(-50%);
    transition: transform 0.3s cubic-bezier(0.16, 1, 0.3, 1), opacity 0.3s ease;
  }
  .cs-arrow.next { right: 2px; }
  .cs-arrow.prev { left: 2px; }
  .cs-arrow svg { width: 22px; height: 22px; }
  .cs-arrow:active { transform: translateY(-50%) scale(0.9); }
  .cs-arrow.is-hidden { opacity: 0; pointer-events: none; }
  .cs-arrow.next.is-hidden { transform: translateY(-50%) translateX(14px) scale(0.8); }
  .cs-arrow.prev.is-hidden { transform: translateY(-50%) translateX(-14px) scale(0.8); }
  .cs-mnav { display: flex; justify-content: center; margin-top: 18px; }
  .cs-dots { display: flex; gap: 8px; }
  .cs-dot { width: 9px; height: 9px; border-radius: 999px; border: none; padding: 0; background: #c3cce0; cursor: pointer; transition: width 0.3s ease, background 0.3s ease; }
  .cs-dot.active { width: 26px; background: #2f6bd8; }
}

/* ===================== DARK THEME ===================== */
[data-theme="dark"] .cs-eyebrow {
  color: var(--accent-deep);
  background: rgba(91, 155, 245, 0.12);
  border-color: rgba(91, 155, 245, 0.3);
}
[data-theme="dark"] .cs-hero { border-bottom-color: var(--d-line); }
[data-theme="dark"] .cs-hero::before { opacity: 0.10; }
[data-theme="dark"] .cs-title,
[data-theme="dark"] .cs-stitle,
[data-theme="dark"] .cs-ctitle { color: var(--d-t1); }
[data-theme="dark"] .cs-hero-sub,
[data-theme="dark"] .cs-sdesc { color: var(--d-t2); }
[data-theme="dark"] .cs-blocks { background: var(--d-base); }
[data-theme="dark"] .cs-card {
  background: rgba(255, 255, 255, 0.05);
  border-color: var(--d-line);
  box-shadow: 0 22px 55px rgba(0, 0, 0, 0.45), inset 0 1px 0 rgba(255, 255, 255, 0.06);
}
[data-theme="dark"] .cs-clogo { background: rgba(255, 255, 255, 0.95); }
[data-theme="dark"] .cs-arrow { background: var(--d-surface-2); color: var(--accent-deep); box-shadow: 0 10px 26px rgba(0, 0, 0, 0.5); }
[data-theme="dark"] .cs-dot { background: rgba(255, 255, 255, 0.22); }
[data-theme="dark"] .cs-dot.active { background: var(--accent); }