/* ============================================================
   HEADER & NAVIGATION
   Modern glassmorphism header with smooth interactions
   ============================================================ */

.header {
  background: rgba(255, 255, 255, 0.85);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  padding: var(--space-2) 0;
  border-bottom: 1px solid var(--color-gray-200);
  position: sticky;
  top: 0;
  z-index: var(--z-sticky);
  transition: box-shadow var(--transition-normal), background var(--transition-normal);
}

/* Header shadow on scroll (controlled by JS or :has if needed) */
.header:hover {
  box-shadow: var(--shadow-sm);
}

.header-container {
  max-width: var(--container-max);
  padding: 0 var(--container-padding);
  margin: 0 auto;
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.header-logo {
  width: 111px;
  height: 31px;
  margin: var(--space-2) var(--space-1) var(--space-2) 0;
  background-size: 100% 100%;
  background-image: url('../img/logo.webp');
  background-repeat: no-repeat;
  transition: opacity var(--transition-fast);
  flex-shrink: 0;
}

.header-logo:hover {
  opacity: 0.8;
}

.header-center {
  flex: 1;
}

.header-contact {
  position: relative;
  flex: 0 0 auto;
  cursor: pointer;
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--color-gray-600);
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-full);
  border: 1px solid var(--color-gray-200);
  transition: all var(--transition-normal);
  white-space: nowrap;
}

.header-contact:hover {
  color: var(--color-primary);
  border-color: var(--color-primary-200);
  background: var(--color-primary-50);
  transform: translateY(-1px);
  box-shadow: var(--shadow-xs);
}

.header-contact:active {
  transform: translateY(0);
}

/* ============================================================
   BACK TO HOMEPAGE NAVIGATION
   ============================================================ */

.back-homepage {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 48px;
  padding: var(--space-2) 0;
}

.back-homepage-container,
.back-homepage-link {
  align-items: center;
  flex: 0 0 auto;
  margin: 0 var(--space-4) 0 0;
}

.back-homepage-link,
.back-arrow-container {
  display: flex;
}

.back-homepage-link {
  display: flex;
  align-items: center;
  color: var(--color-gray-600);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  padding: var(--space-2) var(--space-3);
  border-radius: var(--radius-md);
  transition: all var(--transition-normal);
  gap: var(--space-2);
}

.back-homepage-link:hover {
  color: var(--color-primary);
  background: var(--color-primary-50);
}

.back-arrow-container {
  width: 28px;
  height: 28px;
  margin-right: var(--space-2);
  border-radius: var(--radius-md);
  background: var(--color-primary);
  justify-content: center;
  align-items: center;
  transition: transform var(--transition-fast), background var(--transition-fast);
  box-shadow: var(--shadow-xs);
}

.back-homepage-link:hover .back-arrow-container {
  background: var(--color-primary-hover);
  transform: translateX(-2px);
}

.back-arrow-left {
  width: 12px;
  height: 12px;
  background-image: url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABwAAAAcCAYAAAByDd+UAAAAAXNSR0IArs4c6QAAAQlJREFUSA3VlrluAjEURREdSLSsAXoS1n8LLfxk2EKgZa8RzXAsjSXLehMKLyOedPU8VzPv+LoZFwrvVkmSVKLtGVgTbdAsODSFrem65sGgEBrIhGno1Ds0ha00wegX1gOvwBewoW9YHeDSSKSXKlk02BXYyHeyGkOlZMFgC312RlewcYhk0WBVEvwYifTyxmLiO1lQWFHYbQmvLPgPvLvgu1scWxftkV0HjJ47QZjA4A7a2USej+hT+MTdYnBu0L+MpF/usYQJwNpIgp7wc4H2hX26W6T5QFtk1xkjF6jfH7A+I9KopL92TJ6/9TveO8NbFjTKzU1B1TVx7j1R1kBg8S7CWZv4z38CSiRzgnPpmy8AAAAASUVORK5CYII=);
  background-size: 100% 100%;
  filter: brightness(10);
}

/* ============================================================
   RESPONSIVE HEADER
   ============================================================ */

@media screen and (max-width: 576px) {
  .header {
    padding: var(--space-1) 0;
  }

  .header-container {
    padding: 0 var(--space-3);
  }

  .header-contact {
    font-size: var(--font-size-xs);
    padding: var(--space-1) var(--space-3);
  }

  .back-homepage {
    display: none;
  }
}