/* ====== KNOWLEDGE OVERLAY STYLES ====== */

.knowledge-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.4);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 10000;
  padding: 1rem;
  backdrop-filter: blur(2px);
  animation: fadeInBackdrop 0.3s ease-out forwards;
  opacity: 1;
  pointer-events: auto;
  transition: opacity 0.3s ease;
}

.knowledge-overlay.hidden {
  display: none;
  opacity: 0;
  pointer-events: none;
}

@keyframes fadeInBackdrop {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

.knowledge-overlay-card {
  background: #ffffff;
  border-radius: 24px;
  padding: 3rem 2.5rem;
  max-width: 500px;
  width: 100%;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.2);
  animation: slideUpScale 0.4s cubic-bezier(0.34, 1.56, 0.64, 1) forwards;
  position: relative;
  overflow: hidden;
}

.knowledge-close-button {
  position: absolute;
  top: 1.25rem;
  right: 1.25rem;
  width: 38px;
  height: 38px;
  border-radius: 999px;
  border: none;
  background: rgba(0, 0, 0, 0.05);
  color: #000;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.9rem;
  font-weight: 600;
  transition: all 0.2s ease;
}

.knowledge-close-button:hover {
  background: rgba(0, 0, 0, 0.08);
  transform: translateY(-1px);
}

.knowledge-close-button:focus-visible {
  outline: 2px solid rgba(0, 0, 0, 0.4);
  outline-offset: 2px;
}

@keyframes slideUpScale {
  from {
    opacity: 0;
    transform: translateY(30px) scale(0.95);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

.knowledge-overlay-card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(0, 0, 0, 0.1), transparent);
  pointer-events: none;
}

.knowledge-title {
  font-size: 1.6rem;
  font-weight: 700;
  text-align: center;
  margin-bottom: 0.5rem;
  color: #000;
  line-height: 1.3;
}

.knowledge-subtitle {
  font-size: 0.95rem;
  text-align: center;
  color: #666;
  margin-bottom: 2.5rem;
  font-weight: 400;
  line-height: 1.5;
}

/* Knowledge Options Grid */
.knowledge-options {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
  margin-bottom: 2rem;
}

.knowledge-option {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 1.25rem 1.5rem;
  background: #f8f8f8;
  border: 2px solid transparent;
  border-radius: 16px;
  cursor: pointer;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  text-align: left;
  font-family: inherit;
  font-size: 0.95rem;
  position: relative;
  overflow: hidden;
}

.knowledge-option::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(135deg, rgba(255,255,255,0.5) 0%, transparent 100%);
  opacity: 0;
  transition: opacity 0.3s ease;
  pointer-events: none;
}

.knowledge-option:hover {
  background: #f0f0f0;
  border-color: rgba(0, 0, 0, 0.08);
  transform: translateX(4px);
}

.knowledge-option:hover::before {
  opacity: 1;
}

.knowledge-option.active,
.knowledge-option[aria-pressed="true"] {
  background: linear-gradient(135deg, #333 0%, #1a1a1a 100%);
  border-color: #333;
  color: #fff;
}

.knowledge-option.active svg,
.knowledge-option[aria-pressed="true"] svg {
  color: #fff;
}

.knowledge-option.active .option-description,
.knowledge-option[aria-pressed="true"] .option-description {
  color: rgba(255, 255, 255, 0.8);
}

.knowledge-option:focus {
  outline: none;
  border-color: #333;
  box-shadow: 0 0 0 3px rgba(51, 51, 51, 0.1);
}

.knowledge-option svg {
  flex-shrink: 0;
  width: 24px;
  height: 24px;
  color: #333;
  transition: color 0.3s ease;
}

.option-content {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  flex: 1;
}

.option-title {
  font-weight: 600;
  font-size: 0.95rem;
  line-height: 1.2;
  display: block;
}

.option-description {
  font-size: 0.85rem;
  color: #888;
  line-height: 1.2;
  display: block;
  transition: color 0.3s ease;
}

/* Fallback Link */
.knowledge-fallback {
  text-align: center;
  border-top: 1px solid #e5e5e5;
  padding-top: 1.5rem;
}

.knowledge-fallback-link {
  background: none;
  border: none;
  color: #666;
  font-size: 0.9rem;
  text-decoration: none;
  cursor: pointer;
  font-family: inherit;
  padding: 0;
  transition: all 0.3s ease;
  position: relative;
  padding-bottom: 0.25rem;
}

.knowledge-fallback-link::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: #666;
  opacity: 0;
  transition: opacity 0.3s ease;
}

.knowledge-fallback-link:hover,
.knowledge-fallback-link:focus {
  color: #333;
  outline: none;
}

.knowledge-fallback-link:hover::after,
.knowledge-fallback-link:focus::after {
  opacity: 1;
}

/* Tablet/Mobile Responsiveness */
@media (max-width: 768px) {
  .knowledge-overlay-card {
    padding: 2.5rem 2rem;
    border-radius: 20px;
    max-width: calc(100vw - 2rem);
  }

  .knowledge-title {
    font-size: 1.35rem;
    margin-bottom: 0.5rem;
  }

  .knowledge-subtitle {
    font-size: 0.9rem;
    margin-bottom: 2rem;
  }

  .knowledge-options {
    gap: 1rem;
    margin-bottom: 1.5rem;
  }

  .knowledge-option {
    padding: 1.125rem 1.25rem;
    gap: 0.875rem;
    border-radius: 14px;
  }

  .option-title {
    font-size: 0.9rem;
  }

  .option-description {
    font-size: 0.8rem;
  }
}

@media (max-width: 480px) {
  .knowledge-overlay {
    padding: 0.5rem;
  }

  .knowledge-overlay-card {
    padding: 2rem 1.5rem;
    border-radius: 16px;
    max-width: 100%;
  }

  .knowledge-title {
    font-size: 1.2rem;
    margin-bottom: 0.5rem;
  }

  .knowledge-subtitle {
    font-size: 0.85rem;
    margin-bottom: 1.5rem;
  }

  .knowledge-options {
    gap: 0.875rem;
    margin-bottom: 1.25rem;
  }

  .knowledge-option {
    padding: 1rem 1rem;
    gap: 0.75rem;
    border-radius: 12px;
  }

  .knowledge-option svg {
    width: 20px;
    height: 20px;
  }

  .option-title {
    font-size: 0.85rem;
  }

  .option-description {
    font-size: 0.75rem;
  }

  .knowledge-fallback {
    padding-top: 1rem;
  }

  .knowledge-fallback-link {
    font-size: 0.85rem;
  }
}

/* Accessibility: Reduced Motion */
@media (prefers-reduced-motion: reduce) {
  .knowledge-overlay,
  .knowledge-overlay-card,
  .knowledge-option {
    animation: none;
    transition: none;
  }
}

/* Focus Visible for Keyboard Navigation */
.knowledge-option:focus-visible {
  outline: 2px solid #333;
  outline-offset: 2px;
}