body {
  display: flex;
  flex-direction: column;
  min-height: 100vh;
  height: auto;
  padding: 0;
  font-size: 1.1rem;
}
.case-study-header {
  position: relative;
  overflow: hidden;
  isolation: isolate;
  padding: 6rem 2rem 5rem;
  text-align: center;
  border-bottom: 1px solid var(--card-border-color);
  background-color: var(--background-color);
}
.case-study-header::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0; bottom: 0;
  background-image: radial-gradient(circle at 50% 0%, hsla(210, 50%, 40%, 0.15), transparent 50%);
  z-index: -2;
}
.case-study-header::after {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0; bottom: 0;
  z-index: -1;
  background-image: var(--bg-image); 
  background-size: cover;
  background-position: center;
  opacity: 0.1;
  filter: blur(10px) saturate(0.8);
  -webkit-mask-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 1024 1024' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noiseFilter'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.65' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noiseFilter)'/%3E%3C/svg%3E");
  mask-image: url("data:image/svg+xml,%3Csvg viewBox='0 0 1024 1024' xmlns='http://www.w3.org/2000/svg'%3E%3Cfilter id='noiseFilter'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.65' numOctaves='3' stitchTiles='stitch'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23noiseFilter)'/%3E%3C/svg%3E");
}
.case-study-header h1 {
  font-size: clamp(2.8rem, 7vw, 5rem);
  font-weight: 600;
  margin-bottom: 1rem;
  background: linear-gradient(90deg, #e6edf3, #a5b4fc);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  text-align: center;
  padding: 0 1rem; 
}
.case-study-header p {
  font-size: 1.2rem;
  color: var(--text-color-secondary);
  max-width: 700px;
  margin: 0 auto;
  padding: 0 1rem; 
}
.case-study-links {
  margin-top: 2rem;
  display: flex;
  justify-content: center;
  gap: 1rem;
  align-items: center;
}
.case-study-links .btn {
  flex-grow: 0;
  min-width: 160px;
  text-align: center;
}
.case-study-main {
  flex-grow: 1;
  max-width: 800px;
  margin: 0 auto;
  padding: 3rem 2rem 5rem;
  width: 100%;
}
.case-study-main h2 {
  font-size: clamp(1.5rem, 4vw, 2rem);
  font-weight: 500;
  margin-top: 3rem;
  margin-bottom: 1.5rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--card-border-color);
  text-align: left;
}
.case-study-main p, .case-study-main li {
  line-height: 1.8;
  color: var(--text-color-secondary);
}
.case-study-main p a {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 500;
}
.case-study-main p a:hover {
    text-decoration: underline;
}
.case-study-main ul {
  padding-left: 20px;
}
.tech-stack-list {
  list-style: none;
  padding: 0;
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
}
.tech-stack-list li {
  background-color: rgba(139, 148, 158, 0.1);
  color: var(--text-color);
  padding: 0.5rem 1rem;
  border-radius: 8px;
  font-weight: 500;
  font-size: 0.95rem;
  border: 1px solid var(--card-border-color);
}
.case-study-gallery {
  margin-top: 3rem;
}
.gallery-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
  gap: 1rem;
  list-style: none;
  padding: 0;
}
.gallery-grid a {
  display: block;
  border-radius: 12px;
  overflow: hidden;
  border: 1px solid var(--card-border-color);
  transition: all 0.3s ease;
  aspect-ratio: 16 / 10;
  background-color: var(--background-color);
}
.gallery-grid a:hover {
  transform: translateY(-4px);
  border-color: var(--card-hover-border-color);
  box-shadow: 0 5px 15px rgba(0,0,0,0.2);
}
.gallery-grid img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transition: transform 0.3s ease;
}
.gallery-grid a:hover img {
  transform: scale(1.05);
}
.case-study-video {
  margin-top: 3rem;
}
.video-container {
  position: relative;
  width: 100%;
  height: 0;
  padding-bottom: 56.25%; /* 16:9 aspect ratio */
  background-color: #000;
  border: 1px solid var(--card-border-color);
  border-radius: 12px;
  overflow: hidden;
}
.video-container iframe {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  border: 0;
}
footer {
  margin-top: auto;
}
@media (max-width: 600px) {
  .tech-stack-list li {
    font-size: 0.85rem;
    padding: 0.4rem 0.8rem;
  }
}

/* --- Lightbox Modal --- */
.lightbox-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: rgba(13, 17, 23, 0.9);
  display: flex;
  justify-content: center;
  align-items: center;
  z-index: 1000;
  padding: 1rem;
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.3s ease, visibility 0s 0.3s;
}
.lightbox-overlay.active {
  opacity: 1;
  visibility: visible;
  transition: opacity 0.3s ease;
}
.lightbox-content {
  position: relative;
  max-width: min(95vw, 1600px);
  max-height: min(95vh, 1000px);
  display: flex;
  justify-content: center;
  align-items: center;
  cursor: default;
  transform: scale(0.95);
  transition: transform 0.3s ease;
}
.lightbox-overlay.active .lightbox-content {
    transform: scale(1);
}
.lightbox-content img {
  max-width: 100%;
  max-height: 100%;
  object-fit: contain;
  display: block;
  border-radius: 8px;
  box-shadow: 0 10px 30px rgba(0,0,0,0.5);
}
.lightbox-close {
  position: absolute;
  top: 10px;
  right: 10px;
  width: 40px;
  height: 40px;
  background-color: rgba(30, 30, 30, 0.7);
  border: 1px solid var(--card-border-color);
  border-radius: 50%;
  color: white;
  font-size: 1.8rem;
  font-weight: 300;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  line-height: 1;
  transition: background-color 0.2s ease, transform 0.2s ease;
  z-index: 1001;
}
.lightbox-close:hover {
    background-color: rgba(50, 50, 50, 0.9);
    transform: scale(1.1) rotate(90deg);
}
@media (max-width: 768px) {
    .lightbox-close {
        width: 36px;
        height: 36px;
        font-size: 1.6rem;
    }
}