/* Shared UI Components and Layout Styling */

/* Header and Navigation */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: var(--header-height);
  z-index: 1000;
  background-color: var(--color-glass-bg);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--color-glass-border);
  transition: background-color 0.3s ease, border-color 0.3s ease;
}

.header-container {
  max-width: var(--container-max);
  margin: 0 auto;
  height: 100%;
  padding: 0 1.5rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.brand-logo {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  text-decoration: none;
  color: var(--color-on-surface);
}

.brand-title {
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 600;
  letter-spacing: -0.02em;
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 2rem;
}

.nav-link {
  font-family: var(--font-body);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--color-on-surface-variant);
  text-decoration: none;
  transition: color 0.2s ease;
}

.nav-link:hover, .nav-link.active {
  color: var(--color-secondary);
}

/* Theme Toggle Button */
.theme-toggle-btn {
  background: var(--color-surface-container);
  color: var(--color-on-surface);
  border: 1px solid var(--color-outline-variant);
  width: 42px;
  height: 42px;
  border-radius: var(--radius-full);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: all 0.2s ease;
}

.theme-toggle-btn:hover {
  background: var(--color-surface-container-high);
  transform: scale(1.05);
}

/* Buttons */
.btn-primary {
  background-color: var(--color-primary);
  color: var(--color-on-primary);
  font-family: var(--font-body);
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  padding: 0.75rem 1.5rem;
  border-radius: var(--radius-full);
  border: none;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  text-decoration: none;
  transition: all 0.25s ease;
  min-height: 44px; /* Accessible touch target */
}

.btn-primary:hover {
  background-color: var(--color-secondary);
  box-shadow: 0 4px 12px var(--color-card-shadow);
}

.btn-secondary {
  background-color: var(--color-surface-container);
  color: var(--color-on-surface);
  border: 1px solid var(--color-outline-variant);
  font-family: var(--font-body);
  font-size: 0.8125rem;
  font-weight: 600;
  padding: 0.75rem 1.5rem;
  border-radius: var(--radius-full);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  text-decoration: none;
  transition: all 0.25s ease;
  min-height: 44px;
}

.btn-secondary:hover {
  background-color: var(--color-surface-container-high);
}

/* Cards & Surface Containers */
.card-surface {
  background-color: var(--color-surface);
  border: 1px solid var(--color-glass-border);
  border-radius: var(--radius-xl);
  box-shadow: 0 8px 30px var(--color-card-shadow);
  transition: background-color 0.3s ease, border-color 0.3s ease;
}

.card-interactive {
  cursor: pointer;
  transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
}

.card-interactive:hover {
  transform: translateY(-2px);
  border-color: var(--color-secondary);
  box-shadow: 0 12px 32px var(--color-card-shadow);
}

.card-interactive.selected {
  background-color: var(--color-secondary-container);
  border-color: var(--color-secondary);
  color: var(--color-on-secondary-container);
}

/* Form Controls */
.form-group {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  margin-bottom: 1.25rem;
}

.form-label {
  font-size: 0.8125rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-on-surface-variant);
}

.form-input, .form-select, .form-textarea {
  background-color: var(--color-surface-container-lowest);
  color: var(--color-on-surface);
  border: 1px solid var(--color-outline-variant);
  border-radius: var(--radius-md);
  padding: 0.875rem 1rem;
  font-family: var(--font-body);
  font-size: 0.9375rem;
  width: 100%;
  outline: none;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.form-input:focus, .form-select:focus, .form-textarea:focus {
  border-color: var(--color-secondary);
  box-shadow: 0 0 0 3px rgba(61, 90, 69, 0.15);
}

/* Footer */
.site-footer {
  background-color: var(--color-surface-container-low);
  border-top: 1px solid var(--color-glass-border);
  padding: 3rem 1.5rem;
  margin-top: 4rem;
  text-align: center;
}

/* Mobile Responsive Nav Drawer & Adjustments */
@media (max-width: 1024px) {
  .nav-links {
    display: none; /* Hide default nav on mobile, accessible via dropdown or mobile menu */
  }
}

@media (max-width: 640px) {
  .header-container {
    padding: 0 1rem;
  }
  .brand-title {
    font-size: 1.05rem;
  }
}