/* ============================================================
   Case Studies — cards + modal + video lightbox
   Quantum Tech Solutionz
   Uses the site's brand accent (#2A75BF) and a FIXED dark palette scoped
   to these components, so light-theme.css (which redefines the global
   vars) cannot flip them light. Brand fonts/buttons come from style.css.
   ============================================================ */

/* ---------- Light palette (matches the site's light theme) ---------- */
.qcs-grid,
.qcs-overlay,
.qcs-lightbox {
  --qcs-bg-grad:    linear-gradient(160deg, #ffffff 0%, #f7fafd 100%);
  --qcs-modal-grad: linear-gradient(160deg, #ffffff 0%, #f5f9fd 100%);
  --qcs-bg:         #ffffff;
  --qcs-fg:         #16233b;   /* dark navy heading */
  --qcs-muted:      #64748b;   /* grey-blue body */
  --qcs-border:     #e4ecf5;   /* soft light border */
  --qcs-border-lt:  #d7e3f0;
  --qcs-border-acc: rgba(42, 117, 191, 0.45);
  --qcs-acc:        #2a75bf;   /* site theme accent */
  --qcs-acc-light:  #2a75bf;   /* readable accent on light bg */
  --qcs-acc-bright: #1d5ca0;
  --qcs-acc-glow:   rgba(42, 117, 191, 0.12);
  --qcs-navy:       #112a4f;
  --qcs-shadow-md:  0 6px 20px rgba(17, 42, 79, 0.12);
  --qcs-shadow-lg:  0 18px 50px rgba(17, 42, 79, 0.22);
  --qcs-shadow-acc: 0 10px 30px rgba(42, 117, 191, 0.18);
}

/* ---------- Category cards ---------- */
.qcs-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 24px; }

.qcs-card {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  text-align: left;
  width: 100%;
  padding: 32px 28px;
  border-radius: 16px;
  border: 1px solid var(--qcs-border);
  background: var(--qcs-bg-grad);
  color: var(--qcs-fg);
  cursor: pointer;
  font: inherit;
  overflow: hidden;
  transition: transform .35s ease, border-color .35s ease, box-shadow .35s ease;
}
.qcs-card::after {
  content: '';
  position: absolute; inset: 0;
  background: radial-gradient(600px 200px at 50% -10%, var(--qcs-acc-glow), transparent 70%);
  opacity: 0; transition: opacity .35s ease; pointer-events: none;
}
.qcs-card:hover, .qcs-card:focus-visible {
  transform: translateY(-6px);
  border-color: var(--qcs-border-acc);
  box-shadow: var(--qcs-shadow-acc);
  outline: none;
}
.qcs-card:hover::after, .qcs-card:focus-visible::after { opacity: 1; }

.qcs-card-cover {
  width: 56px; height: 56px;
  display: grid; place-items: center;
  border-radius: 14px;
  margin-bottom: 20px;
  background: var(--qcs-acc-glow);
  color: var(--qcs-acc-bright);
  font-size: 1.5rem;
  overflow: hidden;
}
.qcs-card-cover img { width: 100%; height: 100%; object-fit: cover; }

.qcs-card-tag {
  display: inline-block;
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--qcs-acc-light);
  margin-bottom: 10px;
}
.qcs-card-title { font-size: 1.35rem; font-weight: 700; color: var(--qcs-fg); margin: 0 0 8px; }
.qcs-card-count { font-size: 0.9rem; color: var(--qcs-muted); margin: 0 0 20px; }
.qcs-card-cta {
  margin-top: auto;
  display: inline-flex; align-items: center; gap: 8px;
  font-weight: 600; font-size: 0.95rem;
  color: var(--qcs-acc-light);
}
.qcs-card:hover .qcs-card-cta { color: var(--qcs-acc-bright); }

/* ---------- Overlay + modal ---------- */
.qcs-overlay {
  position: fixed; inset: 0;
  z-index: 10000; /* above header, whatsapp, cookie banner */
  display: none;
  align-items: flex-start; justify-content: center;
  padding: 48px 20px;
  background: rgba(120, 140, 165, 0.45);   /* light tint over the page */
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  overflow-y: auto;
}
.qcs-overlay.is-open { display: flex; }

.qcs-modal {
  position: relative;
  width: 100%;
  max-width: 980px;
  /* Fixed-height flex column: header + footer stay put, only the body
     scrolls. Avoids the old margin:auto top-clip and the click-to-close
     problem while scrolling. */
  max-height: calc(100vh - 96px);
  margin: auto;
  display: flex;
  flex-direction: column;
  border-radius: 16px;
  border: 1px solid var(--qcs-border-lt);
  background: var(--qcs-modal-grad);
  box-shadow: var(--qcs-shadow-lg);
  color: var(--qcs-fg);
  overflow: hidden;
  animation: qcsPop .28s ease;
}
@keyframes qcsPop { from { opacity: 0; transform: translateY(14px) scale(.98); } to { opacity: 1; transform: none; } }

.qcs-modal-close {
  position: absolute; top: 16px; right: 16px;
  z-index: 3;
  width: 40px; height: 40px;
  display: grid; place-items: center;
  border-radius: 50%;
  border: 1px solid var(--qcs-border-lt);
  background: #ffffff;
  color: var(--qcs-fg); font-size: 1.2rem; line-height: 1;
  cursor: pointer;
  transition: background .2s ease, border-color .2s ease, color .2s ease;
}
.qcs-modal-close:hover, .qcs-modal-close:focus-visible { background: var(--qcs-acc); border-color: var(--qcs-acc); color: #fff; outline: none; }

/* Fixed header (flex child — does not scroll) */
.qcs-modal-header {
  flex: 0 0 auto;
  position: relative;
  padding: 34px 56px 22px;
  border-bottom: 1px solid var(--qcs-border);
  background: var(--qcs-modal-grad);
  border-radius: 16px 16px 0 0;
}
.qcs-eyebrow {
  font-size: 0.74rem; font-weight: 700;
  letter-spacing: 0.22em; text-transform: uppercase;
  color: var(--qcs-acc); margin: 0 0 10px;
}
.qcs-modal-title { font-size: 1.9rem; font-weight: 700; color: var(--qcs-fg); margin: 0 0 8px; }
.qcs-modal-sub { font-size: 0.98rem; color: var(--qcs-muted); margin: 0; max-width: 60ch; }

/* Scrollable body (the ONLY scrollable part) */
.qcs-modal-body { flex: 1 1 auto; overflow-y: auto; overscroll-behavior: contain; padding: 28px 56px 40px; }

.qcs-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
  align-items: center;
  padding: 26px 0;
}
.qcs-row + .qcs-row { border-top: 1px solid var(--qcs-border); }
.qcs-row.is-flip .qcs-thumb { order: 2; }
.qcs-row.is-flip .qcs-content { order: 1; }

/* Thumbnail + play */
.qcs-thumb {
  position: relative;
  display: block;
  width: 100%;
  aspect-ratio: 16 / 10;
  border: 0; padding: 0;
  border-radius: 14px;
  overflow: hidden;
  cursor: pointer;
  background: var(--qcs-bg);
}
.qcs-thumb img { width: 100%; height: 100%; object-fit: cover; display: block; transition: transform .4s ease; }
.qcs-thumb:hover img, .qcs-thumb:focus-visible img { transform: scale(1.05); }
.qcs-thumb:focus-visible { outline: 2px solid var(--qcs-acc); outline-offset: 2px; }
.qcs-thumb::before {
  content: '';
  position: absolute; inset: 0;
  background: linear-gradient(180deg, rgba(0,0,0,0) 40%, rgba(0,0,0,0.45) 100%);
  pointer-events: none;
}
.qcs-play {
  position: absolute; top: 50%; left: 50%;
  transform: translate(-50%, -50%);
  width: 62px; height: 62px;
  display: grid; place-items: center;
  border-radius: 50%;
  background: rgba(255,255,255,0.92);
  color: var(--qcs-navy);
  font-size: 1.35rem;
  box-shadow: 0 8px 24px rgba(0,0,0,0.4);
  transition: background .25s ease, color .25s ease, transform .25s ease;
}
.qcs-thumb:hover .qcs-play, .qcs-thumb:focus-visible .qcs-play {
  background: var(--qcs-acc); color: #fff; transform: translate(-50%, -50%) scale(1.06);
}
.qcs-duration {
  position: absolute; left: 12px; bottom: 12px;
  padding: 3px 9px;
  border-radius: 6px;
  background: rgba(0,0,0,0.72);
  color: #fff;
  font-size: 0.76rem; font-weight: 600;
  letter-spacing: 0.02em;
}

.qcs-pill {
  display: inline-block;
  padding: 4px 12px;
  border-radius: 999px;
  border: 1px solid var(--qcs-border-acc);
  background: var(--qcs-acc-glow);
  color: var(--qcs-acc-light);
  font-size: 0.72rem; font-weight: 600;
  letter-spacing: 0.05em; text-transform: uppercase;
  margin-bottom: 14px;
}
.qcs-content-title { font-size: 1.35rem; font-weight: 700; color: var(--qcs-fg); margin: 0 0 12px; }
.qcs-content-desc { font-size: 0.97rem; line-height: 1.65; color: var(--qcs-muted); margin: 0 0 20px; }

.qcs-watch {
  display: inline-flex; align-items: center; gap: 9px;
  padding: 11px 22px;
  border-radius: 10px;
  border: 1px solid var(--qcs-acc);
  background: transparent;
  color: var(--qcs-acc-light);
  font-weight: 600; font-size: 0.92rem;
  cursor: pointer;
  transition: background .25s ease, color .25s ease;
}
.qcs-watch:hover, .qcs-watch:focus-visible { background: var(--qcs-acc); color: #fff; outline: none; }

/* Modal footer (flex child — does not scroll) */
.qcs-modal-footer {
  flex: 0 0 auto;
  display: flex; align-items: center; justify-content: space-between;
  gap: 16px; flex-wrap: wrap;
  padding: 20px 56px;
  border-top: 1px solid var(--qcs-border);
  border-radius: 0 0 16px 16px;
  background: var(--qcs-modal-grad);
}
.qcs-modal-logo { height: 30px; width: auto; opacity: .9; }
.qcs-watch-link { text-decoration: none; }

/* ---------- Video lightbox ---------- */
.qcs-lightbox {
  position: fixed; inset: 0;
  z-index: 10001;
  display: none;
  align-items: center; justify-content: center;
  padding: 24px;
  background: rgba(4, 8, 16, 0.9);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
}
.qcs-lightbox.is-open { display: flex; }
.qcs-lightbox-inner { position: relative; width: 100%; max-width: 960px; }
.qcs-lightbox-close {
  position: absolute; top: -46px; right: 0;
  width: 40px; height: 40px;
  display: grid; place-items: center;
  border-radius: 50%;
  border: 1px solid var(--qcs-border-lt);
  background: rgba(255,255,255,0.08);
  color: #fff; font-size: 1.2rem; cursor: pointer;
}
.qcs-lightbox-close:hover { background: var(--qcs-acc); border-color: var(--qcs-acc); }
.qcs-lightbox video { width: 100%; border-radius: 12px; display: block; background: #000; }
.qcs-lightbox-frame { position: relative; width: 100%; aspect-ratio: 16 / 9; border-radius: 12px; overflow: hidden; background: #000; }
.qcs-lightbox-frame iframe { position: absolute; inset: 0; width: 100%; height: 100%; border: 0; }

/* ---------- Responsive ---------- */
@media (max-width: 767px) {
  .qcs-grid { grid-template-columns: 1fr; }
  .qcs-overlay { padding: 0; align-items: stretch; }
  .qcs-modal { max-width: none; max-height: 100vh; height: 100%; border-radius: 0; margin: 0; }
  .qcs-modal-header { padding: 26px 22px 18px; border-radius: 0; }
  .qcs-modal-title { font-size: 1.5rem; }
  .qcs-modal-body { padding: 12px 22px 32px; }
  .qcs-modal-footer { padding: 18px 22px; border-radius: 0; }
  .qcs-row { grid-template-columns: 1fr; gap: 18px; }
  .qcs-row.is-flip .qcs-thumb { order: 0; }
  .qcs-row.is-flip .qcs-content { order: 0; }
}

/* ---------- Reduced motion ---------- */
@media (prefers-reduced-motion: reduce) {
  .qcs-card, .qcs-card::after, .qcs-thumb img, .qcs-play { transition: none !important; }
  .qcs-modal { animation: none !important; }
}