/* ═══════════════════════════════════════════════════════════
   CASE STUDIES - Visuell ansprechendes Card-Design
   ═══════════════════════════════════════════════════════════ */

.case-studies-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
  max-width: 1000px;
  margin: 0 auto;
}

/* Haupt-Card */
.case-study-card {
  background: linear-gradient(145deg, rgba(21, 11, 51, 0.8), rgba(10, 5, 24, 0.9));
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 24px;
  overflow: hidden;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.4);
  cursor: pointer;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.case-study-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 30px 80px rgba(0, 0, 0, 0.5);
}

/* Preview (immer sichtbar) */
.case-study-preview {
  padding: 1.5rem 2rem 2rem;
  text-align: center;
}

.case-study-preview p {
  color: rgba(255, 255, 255, 0.8);
  line-height: 1.7;
  margin: 0 0 1.5rem 0;
  font-size: 1.05rem;
}

.case-expand-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1.5rem;
  background: linear-gradient(135deg, rgba(77, 168, 255, 0.2), rgba(0, 229, 255, 0.1));
  border: 1px solid rgba(77, 168, 255, 0.3);
  border-radius: 30px;
  color: #00e5ff;
  font-weight: 600;
  font-size: 0.9rem;
  transition: all 0.3s ease;
}

.case-expand-btn svg {
  transition: transform 0.3s ease;
}

.case-study-card:hover .case-expand-btn {
  background: linear-gradient(135deg, rgba(77, 168, 255, 0.3), rgba(0, 229, 255, 0.2));
  border-color: rgba(77, 168, 255, 0.5);
}

/* Expandable Bereich */
.case-study-expandable {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.6s cubic-bezier(0.25, 0.46, 0.45, 0.94), 
              opacity 0.4s ease;
  opacity: 0;
}

.case-study-card.expanded .case-study-expandable {
  max-height: 2000px;
  opacity: 1;
}

.case-study-card.expanded .case-expand-btn svg {
  transform: rotate(180deg);
}

.case-study-card.expanded .case-expand-btn span::after {
  content: " schliessen";
}

/* Header mit Gradient */
.case-study-header {
  background: linear-gradient(135deg, rgba(77, 168, 255, 0.1), rgba(122, 79, 204, 0.1));
  padding: 1.5rem 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: 1rem;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.case-study-badges {
  display: flex;
  gap: 0.75rem;
  flex-wrap: wrap;
}

/* Titel-Bereich */
.case-study-title {
  padding: 2rem;
  text-align: center;
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}

.case-study-title h3 {
  font-size: 1.75rem;
  margin: 0;
  background: linear-gradient(135deg, #fff, #4da8ff);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* Haupt-Content Grid */
.case-study-main {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0;
}

.case-study-section {
  padding: 2rem;
}

.case-study-section:first-child {
  border-right: 1px solid rgba(255, 255, 255, 0.06);
}

.case-study-section h4 {
  font-size: 0.875rem;
  text-transform: uppercase;
  letter-spacing: 2px;
  color: #00e5ff;
  margin: 0 0 1rem 0;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.case-study-section h4::before {
  content: "//";
  color: rgba(0, 229, 255, 0.5);
}

.case-study-section p {
  color: rgba(255, 255, 255, 0.8);
  line-height: 1.7;
  margin: 0;
}

/* Tech Stack */
.case-study-tech-stack {
  display: flex;
  justify-content: center;
  gap: 1rem;
  flex-wrap: wrap;
  padding: 1.5rem 2rem;
  background: rgba(0, 0, 0, 0.2);
  border-top: 1px solid rgba(255, 255, 255, 0.06);
  border-bottom: 1px solid rgba(255, 255, 255, 0.06);
}

.case-study-tech-stack .tech-tag {
  background: rgba(77, 168, 255, 0.1);
  border: 1px solid rgba(77, 168, 255, 0.2);
  padding: 0.5rem 1rem;
  border-radius: 20px;
  font-size: 0.8rem;
  color: #4da8ff;
}

/* Technical Details */
.case-study-details {
  padding: 2rem;
  background: rgba(0, 0, 0, 0.15);
}

.case-study-details h5 {
  font-size: 1rem;
  text-transform: uppercase;
  letter-spacing: 2px;
  color: #7a4fcc;
  margin: 0 0 1.5rem 0;
  text-align: center;
}

/* Detail Items als Grid */
.detail-items {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

.detail-item {
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid rgba(255, 255, 255, 0.08);
  border-radius: 16px;
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  transition: all 0.3s ease;
}

.detail-item:hover {
  background: rgba(255, 255, 255, 0.06);
  border-color: rgba(77, 168, 255, 0.3);
  transform: translateY(-3px);
}

.detail-icon {
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, rgba(77, 168, 255, 0.2), rgba(0, 229, 255, 0.1));
  border: 1px solid rgba(77, 168, 255, 0.3);
  border-radius: 12px;
  color: #00e5ff;
}

.detail-item strong {
  display: block;
  color: #fff;
  font-size: 0.95rem;
  margin-bottom: 0.25rem;
}

.detail-item > div:last-child {
  color: rgba(255, 255, 255, 0.7);
  font-size: 0.9rem;
  line-height: 1.6;
}

/* ═══════════════════════════════════════════════════════════
   SKALIERBARKEIT: Mehrere Case Studies
   ═══════════════════════════════════════════════════════════ */

/* Grid für mehrere Case Studies */
.case-studies-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
  max-width: 1000px;
  margin: 0 auto;
}

/* Zwei Spalten ab 1200px wenn genug Platz */
@media screen and (min-width: 1200px) {
  .case-studies-grid.multiple-cases {
    grid-template-columns: repeat(2, 1fr);
    max-width: 1400px;
  }
  
  .case-studies-grid.multiple-cases .case-study-card {
    height: fit-content;
  }
}

/* ═══════════════════════════════════════════════════════════
   ACCESSIBILITY & UX IMPROVEMENTS
   ═══════════════════════════════════════════════════════════ */

/* Button statt div für bessere Accessibility */
.case-expand-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 1.5rem;
  background: linear-gradient(135deg, rgba(77, 168, 255, 0.2), rgba(0, 229, 255, 0.1));
  border: 1px solid rgba(77, 168, 255, 0.3);
  border-radius: 30px;
  color: #00e5ff;
  font-weight: 600;
  font-size: 0.9rem;
  transition: all 0.3s ease;
  cursor: pointer;
  font-family: inherit;
}

.case-expand-btn:hover,
.case-expand-btn:focus {
  background: linear-gradient(135deg, rgba(77, 168, 255, 0.3), rgba(0, 229, 255, 0.2));
  border-color: rgba(77, 168, 255, 0.5);
  outline: none;
  box-shadow: 0 0 0 3px rgba(77, 168, 255, 0.2);
}

.case-expand-btn svg {
  transition: transform 0.3s ease;
}

/* Expanded State via JS-Klasse */
.case-study-card.expanded .case-expand-btn svg {
  transform: rotate(180deg);
}

/* ═══════════════════════════════════════════════════════════
   SMOOTH HEIGHT ANIMATION (keine Magic Numbers)
   ═══════════════════════════════════════════════════════════ */

.case-study-expandable {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.5s cubic-bezier(0.25, 0.46, 0.45, 0.94), 
              opacity 0.35s ease;
  opacity: 0;
}

.case-study-card.expanded .case-study-expandable {
  opacity: 1;
}

/* ═══════════════════════════════════════════════════════════
   MOBILE ANPASSUNGEN
   ═══════════════════════════════════════════════════════════ */

@media screen and (max-width: 768px) {
  .case-study-header {
    flex-direction: column;
    text-align: center;
    padding: 1.25rem;
  }
  
  .case-study-title {
    padding: 1.5rem 1rem;
  }
  
  .case-study-title h3 {
    font-size: 1.4rem;
  }
  
  .case-study-main {
    grid-template-columns: 1fr;
  }
  
  .case-study-section {
    padding: 1.5rem;
  }
  
  .case-study-section:first-child {
    border-right: none;
    border-bottom: 1px solid rgba(255, 255, 255, 0.06);
  }
  
  .case-study-tech-stack {
    padding: 1rem;
  }
  
  .case-study-details {
    padding: 1.5rem 1rem;
  }
  
  .detail-items {
    grid-template-columns: 1fr;
    gap: 0.75rem;
  }
  
  .detail-item {
    padding: 1.25rem;
  }
  
  .detail-item > div:last-child {
    font-size: 0.9rem;
  }
}