/* =============================================
   Case Study — lupofyt.html
   Doplňkový CSS, staví na style.css
   ============================================= */

/* ---- Case Study Hero ---- */
.cs-hero {
  position: relative;
  min-height: 90vh;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  overflow: hidden;
  background: var(--clr-dark);
  padding-top: 80px; /* nav height */
}
.cs-hero__bg {
  position: absolute; inset: 0; z-index: 0;
}
.cs-hero__bg img {
  width: 100%; height: 100%;
  object-fit: cover;
  object-position: center;
  filter: saturate(0.85);
}
.cs-hero__overlay {
  position: absolute; inset: 0; z-index: 1;
  background: linear-gradient(
    to top,
    rgba(7,26,11,0.97) 0%,
    rgba(7,26,11,0.72) 40%,
    rgba(7,26,11,0.45) 100%
  );
}
.cs-hero .container {
  position: relative; z-index: 2;
  padding-bottom: 0;
}
.cs-back-btn {
  display: inline-flex; align-items: center; gap: 8px;
  color: rgba(255,255,255,0.55);
  font-size: 0.82rem; font-weight: 500;
  transition: color 0.2s;
  margin-bottom: 40px;
  margin-top: 16px;
}
.cs-back-btn:hover { color: rgba(255,255,255,0.9); }
.cs-hero__content { margin-bottom: 40px; }
.cs-hero__labels {
  display: flex; align-items: center;
  flex-wrap: wrap; gap: 14px;
  margin-bottom: 22px;
}
.cs-hero__badge {
  display: inline-flex; align-items: center; gap: 6px;
  background: rgba(197,151,58,0.18);
  border: 1px solid rgba(197,151,58,0.4);
  color: #E8C56A;
  padding: 5px 14px; border-radius: 100px;
  font-size: 0.76rem; font-weight: 700; letter-spacing: 0.05em;
}
.cs-hero__client {
  display: flex; align-items: center; gap: 10px;
  color: rgba(255,255,255,0.55); font-size: 0.82rem; font-weight: 500;
}
.cs-hero__client-logo {
  width: 36px; height: 36px;
  object-fit: contain; border-radius: 50%;
  background: white; padding: 3px;
  flex-shrink: 0;
}
.cs-hero__title {
  font-size: clamp(2.2rem, 5vw, 4rem);
  font-weight: 800; color: white;
  line-height: 1.08; letter-spacing: -0.035em;
  margin-bottom: 18px;
}
.cs-hero__sub {
  font-size: clamp(0.95rem, 1.6vw, 1.1rem);
  color: rgba(255,255,255,0.65); line-height: 1.7;
  max-width: 600px;
}

/* Stats bar at bottom of hero */
.cs-stats-bar {
  display: flex; align-items: stretch;
  background: rgba(255,255,255,0.06);
  backdrop-filter: blur(8px);
  border: 1px solid rgba(255,255,255,0.1);
  border-radius: var(--radius) var(--radius) 0 0;
  overflow: hidden;
  flex-wrap: wrap;
}
.cs-stat {
  flex: 1; min-width: 120px;
  padding: 22px 28px;
  display: flex; flex-direction: column; gap: 5px;
}
.cs-stat__value {
  font-size: 1.7rem; font-weight: 800;
  color: var(--clr-highlight); letter-spacing: -0.03em; line-height: 1;
}
.cs-stat__label {
  font-size: 0.76rem; color: rgba(255,255,255,0.45); font-weight: 500;
}
.cs-stat__divider {
  width: 1px; background: rgba(255,255,255,0.1);
  align-self: stretch;
}

/* ---- Sections ---- */
.cs-section { padding: 80px 0; }

/* ---- Intro ---- */
.cs-intro__grid {
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  gap: 64px; align-items: start;
}
.cs-intro__title {
  font-size: clamp(1.6rem, 2.8vw, 2.2rem);
  font-weight: 800; letter-spacing: -0.025em; line-height: 1.2;
  margin-bottom: 20px;
}
.cs-intro__text p { color: var(--clr-muted); line-height: 1.75; }
.cs-intro__text strong { color: var(--clr-text); }
.cs-ai-note {
  display: flex; align-items: flex-start; gap: 12px;
  background: #EFF7F2;
  border: 1px solid var(--clr-border);
  border-left: 3px solid var(--clr-accent);
  border-radius: var(--radius-sm);
  padding: 16px 18px;
  margin-top: 24px;
  font-size: 0.9rem; color: var(--clr-muted); line-height: 1.6;
}
.cs-ai-note svg { color: var(--clr-accent); flex-shrink: 0; margin-top: 2px; }
.cs-ai-note strong { color: var(--clr-text); }

/* Data card */
.cs-data-card {
  background: white;
  border: 1px solid var(--clr-border);
  border-radius: var(--radius-xl);
  overflow: hidden;
  box-shadow: var(--shadow-md);
}
.cs-data-card__title {
  font-size: 0.82rem; font-weight: 700;
  letter-spacing: 0.08em; text-transform: uppercase;
  color: var(--clr-muted);
  padding: 20px 24px 14px;
  border-bottom: 1px solid var(--clr-border);
}
.cs-data-table { width: 100%; }
.cs-data-row {
  display: flex; align-items: baseline;
  justify-content: space-between;
  padding: 11px 24px;
  border-bottom: 1px solid var(--clr-border);
  gap: 12px;
}
.cs-data-row:last-child { border-bottom: none; }
.cs-data-row dt {
  font-size: 0.82rem; color: var(--clr-muted);
  font-weight: 500; flex-shrink: 0;
}
.cs-data-row dd {
  font-size: 0.88rem; font-weight: 600;
  color: var(--clr-text); text-align: right;
  line-height: 1.45;
}
.cs-data-row--highlight {
  background: var(--clr-bg-light);
}
.cs-data-row--highlight dd {
  color: var(--clr-accent); font-size: 1rem;
}

/* ---- Detection stages ---- */
.cs-stages { padding-bottom: 40px; }
.cs-stage {
  margin-bottom: 72px;
}
.cs-stage:last-child { margin-bottom: 0; }
.cs-stage__header {
  display: flex; gap: 28px; align-items: flex-start;
  margin-bottom: 28px;
}
.cs-stage__num {
  font-size: 3.5rem; font-weight: 800;
  color: var(--clr-border); letter-spacing: -0.05em;
  line-height: 1; flex-shrink: 0;
  margin-top: -8px;
}
.cs-stage__title {
  font-size: clamp(1.1rem, 2vw, 1.4rem);
  font-weight: 700; letter-spacing: -0.02em; line-height: 1.25;
  margin-bottom: 10px;
}
.cs-stage__desc {
  font-size: 0.93rem; color: var(--clr-muted); line-height: 1.75;
}
.cs-ai-badge {
  display: inline-flex; align-items: center; gap: 7px;
  background: rgba(45,134,83,0.09);
  border: 1px solid rgba(45,134,83,0.25);
  color: var(--clr-accent);
  padding: 5px 13px; border-radius: 100px;
  font-size: 0.76rem; font-weight: 600;
  margin-top: 14px;
}

/* Stage image */
.cs-stage__img-wrap {
  border-radius: var(--radius-xl);
  overflow: hidden;
  box-shadow: var(--shadow-lg);
}
.cs-stage__img-wrap--white-bg {
  background: #F4F4F4;
  display: flex; align-items: center; justify-content: center;
  padding: 24px;
}
.cs-stage__img-wrap img {
  width: 100%; height: auto; display: block;
}
.cs-stage__img-wrap--white-bg img {
  max-height: 520px;
  width: auto; max-width: 100%;
  margin: 0 auto;
}

/* Stage pair (2 images side by side) */
.cs-stage__pair {
  display: grid; grid-template-columns: 1fr 1fr; gap: 16px;
}
.cs-stage__pair-img {
  position: relative; border-radius: var(--radius);
  overflow: hidden; box-shadow: var(--shadow-md);
  background: #111;
}
.cs-stage__pair-img img {
  width: 100%; height: 100%;
  object-fit: cover; display: block;
}
.cs-stage__pair-label {
  display: block;
  background: rgba(0,0,0,0.65);
  color: rgba(255,255,255,0.8);
  font-size: 0.74rem; font-weight: 500;
  padding: 7px 12px;
  position: absolute; bottom: 0; left: 0; right: 0;
}

/* ---- Results section ---- */
.cs-results {
  background: var(--clr-dark);
  padding: 80px 0;
}
.cs-results__inner { text-align: center; }
.cs-results__title {
  font-size: clamp(1.5rem, 3vw, 2.2rem);
  font-weight: 800; color: white;
  letter-spacing: -0.025em; margin-bottom: 56px;
}
.cs-results__grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 2px;
  background: rgba(255,255,255,0.06);
  border-radius: var(--radius-xl);
  overflow: hidden;
}
.cs-result-item {
  background: rgba(7,26,11,0.8);
  padding: 40px 24px;
  display: flex; flex-direction: column; gap: 10px;
  transition: background 0.3s;
}
.cs-result-item:hover { background: rgba(45,134,83,0.15); }
.cs-result-item__value {
  font-size: clamp(2rem, 3.5vw, 3rem);
  font-weight: 800; color: var(--clr-highlight);
  letter-spacing: -0.04em; line-height: 1;
}
.cs-result-item__label {
  font-size: 0.82rem; color: rgba(255,255,255,0.45);
  line-height: 1.5;
}

/* ---- CTA section ---- */
.cs-cta-section {
  padding: 80px 0;
  background: var(--clr-bg-light);
}
.cs-cta__inner {
  display: flex; align-items: center;
  justify-content: space-between; gap: 48px;
  flex-wrap: wrap;
}
.cs-cta__title {
  font-size: clamp(1.4rem, 2.5vw, 2rem);
  font-weight: 800; letter-spacing: -0.025em; line-height: 1.2;
  margin-bottom: 12px;
}
.cs-cta__sub {
  font-size: 0.95rem; color: var(--clr-muted); line-height: 1.7;
  max-width: 540px;
}
.cs-cta__actions {
  display: flex; gap: 14px; flex-wrap: wrap; flex-shrink: 0;
}
.cs-cta__actions .btn--ghost {
  background: transparent; color: var(--clr-accent);
  border: 2px solid var(--clr-accent);
}
.cs-cta__actions .btn--ghost:hover {
  background: var(--clr-accent); color: white;
}

/* ---- Responsive ---- */
@media (max-width: 1024px) {
  .cs-results__grid { grid-template-columns: repeat(2, 1fr); }
}
@media (max-width: 900px) {
  .cs-hero { min-height: 80vh; }
  .cs-intro__grid { grid-template-columns: 1fr; gap: 40px; }
  .cs-stats-bar { flex-wrap: wrap; }
  .cs-stat__divider { display: none; }
  .cs-stat { flex: 0 0 50%; }
  .cs-cta__inner { flex-direction: column; align-items: flex-start; }
}
@media (max-width: 680px) {
  .cs-hero { min-height: 70vh; }
  .cs-stage__header { flex-direction: column; gap: 8px; }
  .cs-stage__num { font-size: 2.5rem; margin-top: 0; }
  .cs-stage__pair { grid-template-columns: 1fr; }
  .cs-results__grid { grid-template-columns: 1fr 1fr; }
  .cs-stat { flex: 0 0 100%; }
  .cs-back-btn { margin-bottom: 24px; }
}
@media (max-width: 420px) {
  .cs-results__grid { grid-template-columns: 1fr; }
  .cs-hero__title { font-size: 1.9rem; }
  .cs-cta__actions .btn { width: 100%; justify-content: center; }
}