/* ─── Navigation Header ─────────────────────────────────────────────────────
   LOCKED SECTION — do not edit without explicit user unlock instruction
   ──────────────────────────────────────────────────────────────────────── */

.smartbi-nav {
  position: sticky;
  top: 0;
  left: 0;
  width: 100%;
  z-index: var(--sbi-z-nav);
  background-color: var(--sbi-nav-bg);
  backdrop-filter: blur(var(--sbi-nav-blur)) saturate(var(--sbi-backdrop-saturate));
  -webkit-backdrop-filter: blur(var(--sbi-nav-blur)) saturate(var(--sbi-backdrop-saturate));
  font-family: var(--sbi-font-family-sans);
  transition: background-color var(--sbi-duration-normal) var(--sbi-ease-out), border-color var(--sbi-duration-normal) var(--sbi-ease-out);
  line-height: 1.2 !important;
}

.nav-container {
  width: 100%;
  padding: 12px clamp(1rem, 5vw, 60px) 8px clamp(1rem, 5vw, 60px); /* Reduced vertical padding */
  display: flex;
  align-items: center;
  justify-content: center;
  gap: clamp(20px, 4vw, 40px);
  flex-wrap: nowrap;
}

.nav-logo-group {
  display: flex;
  align-items: center;
  gap: 12px;                /* Spacing between brand name, separator pipe, and project title */
  flex-shrink: 0;
}

.nav-author-link {
  display: inline-flex;
  align-items: center;
  text-decoration: none;
  flex-shrink: 0;
}

.nav-author-name {
  font-family: var(--sbi-font-family-sans);
  font-size: var(--sbi-font-size-sm);
  font-weight: var(--sbi-font-weight-medium);
  color: var(--sbi-text-secondary);
  letter-spacing: -0.01em;
  transition: color var(--sbi-duration-normal) var(--sbi-ease-out);
  white-space: nowrap;
  line-height: 1.2 !important;
}

.nav-author-link:hover .nav-author-name {
  color: hsl(262 83% 58%);
}

.nav-back-icon {
  width: 24px; /* Reduced from 28px */
  height: 24px; /* Reduced from 28px */
  border-radius: var(--sbi-radius-md);
  background-color: hsl(var(--sbi-alpha-black-04)); /* Soft, subtle background */
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: var(--sbi-text-secondary); /* Muted gray arrow */
  transition: background-color var(--sbi-duration-fast) var(--sbi-ease-out), color var(--sbi-duration-fast) var(--sbi-ease-out);
}

.nav-back-btn:hover .nav-back-icon {
  background-color: hsl(var(--sbi-alpha-blue-10)); /* Subtle blue background on hover */
  color: var(--sbi-text-brand); /* Arrow turns blue */
}

.nav-back-btn svg {
  width: 12px; /* Reduced from 14px */
  height: 12px; /* Reduced from 14px */
  fill: none;
  stroke: currentColor;
  stroke-width: 3;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.nav-brand-pipe {
  width: 1px;
  height: 16px;
  background-color: var(--sbi-border-default); /* Gray separator pipe */
  flex-shrink: 0;
}

.nav-project-logo-img {
  height: 20px;             /* Product icon size */
  width: auto;
  display: block;
  object-fit: contain;
  flex-shrink: 0;
}

.nav-links-nav {
  display: flex;
  align-items: center;
  overflow: visible; /* Allow dropdown to be visible */
}

.nav-links-list {
  display: flex;
  align-items: center;
  list-style: none;
  gap: clamp(15px, 2.5vw, 24px);
  overflow: visible; /* Allow dropdown to be visible on desktop */
  scrollbar-width: none;
  -ms-overflow-style: none;
}

.nav-links-list::-webkit-scrollbar {
  display: none;
}

.nav-link-item a {
  display: inline-block;    /* Block layout container for correct padding and positioning */
  font-size: var(--sbi-nav-link-size);
  font-weight: var(--sbi-font-weight-regular);
  color: var(--sbi-nav-link-color);
  text-decoration: none;
  white-space: nowrap;
  position: relative;
  padding: 4px 0;           /* Reduced from 6px */
  transition: color var(--sbi-duration-normal) var(--sbi-ease-out);
  line-height: 1.2 !important;
}

.nav-link-item a::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: var(--sbi-border-width-medium);
  background-color: var(--sbi-nav-link-underline);
  transform: scaleX(0);
  transform-origin: right;
  transition: transform var(--sbi-duration-moderate) var(--sbi-ease-nav-underline);
}

.nav-link-item a:hover::after,
.nav-link-item.active a::after {
  transform: scaleX(1);
  transform-origin: left;
}

.nav-link-item a:hover,
.nav-link-item.active a {
  color: var(--sbi-nav-link-color-active);
  font-weight: var(--sbi-font-weight-regular);
}

/* Divider Separator Line */
.nav-divider {
  width: 100%;
  height: var(--sbi-border-width-hairline);
  background-color: var(--sbi-nav-border);
}

/* ─── CTA Button (AI Driven Prototype) ──────────────────────────────── */
.nav-cta a {
  background-color: hsl(262 83% 58%) !important; /* Solid Brand Purple */
  background-image: none !important;
  color: hsl(var(--sbi-color-white)) !important;
  padding: 6px 16px !important;                 /* py-1.5 px-4 */
  border-radius: var(--sbi-radius-lg) !important; /* rounded-lg (8px) */
  font-weight: var(--sbi-font-weight-semibold) !important; /* font-semibold */
  font-size: var(--sbi-font-size-xs) !important;  /* text-xs (11px) */
  letter-spacing: -0.01em;
  box-shadow: 0 2px 8px hsl(262 83% 58% / 0.15) !important;
  transition: transform var(--sbi-duration-normal) var(--sbi-ease-spring-bounce),
              box-shadow var(--sbi-duration-normal) var(--sbi-ease-out),
              background-color var(--sbi-duration-normal) var(--sbi-ease-out) !important;
  white-space: nowrap;
  line-height: 1.2 !important;
}

.nav-cta a:hover {
  background-color: hsl(262 83% 52%) !important; /* Slightly lighter purple on hover */
  color: hsl(var(--sbi-color-white)) !important;
  box-shadow: 0 4px 12px hsl(262 83% 58% / 0.25) !important;
  transform: translateY(-1px) scale(1.03);
}

.nav-cta a:active {
  transform: translateY(0) scale(0.97);
}

/* Override underline animation — CTAs don't need it */
.nav-cta a::after {
  display: none !important;
}

/* ─── Dropdown Menu (MacBook Style) ─────────────────────────────────── */
.nav-dropdown-wrapper {
  position: relative;
}

.nav-dropdown-menu {
  position: absolute;
  top: 100%;
  left: 50%;
  transform: translateX(-50%) translateY(8px);
  background-color: var(--sbi-surface-dropdown);
  backdrop-filter: blur(var(--sbi-blur-dropdown)) saturate(var(--sbi-backdrop-saturate-dropdown));
  -webkit-backdrop-filter: blur(var(--sbi-blur-dropdown)) saturate(var(--sbi-backdrop-saturate-dropdown));
  border: var(--sbi-border-width-hairline) solid var(--sbi-border-card);
  border-radius: var(--sbi-radius-md);
  box-shadow: var(--sbi-shadow-nav);
  padding: 4px 0;
  margin: 0;
  list-style: none;
  display: none;
  min-width: 130px;
  z-index: var(--sbi-z-nav-dropdown);
}

.nav-dropdown-menu.show,
.nav-dropdown-wrapper:hover .nav-dropdown-menu {
  display: block;
}

/* Invisible bridge to prevent flickering when moving mouse from trigger to menu */
.nav-dropdown-menu::before {
  content: '';
  position: absolute;
  top: -12px;
  left: 0;
  width: 100%;
  height: 12px;
  background: transparent;
}

/* Keep parent text and underline active when hovering the wrapper or dropdown */
.nav-dropdown-wrapper:hover > a {
  color: var(--sbi-nav-link-color-active) !important;
}

.nav-dropdown-wrapper:hover > a::after {
  transform: scaleX(1) !important;
  transform-origin: left !important;
}

.nav-dropdown-menu li {
  padding: 0 4px;
  width: 100%;
}

.nav-dropdown-menu li a {
  display: block;
  width: 100%;
  padding: 6px 14px;
  font-size: var(--sbi-font-size-xs);
  color: var(--sbi-text-primary);
  text-decoration: none !important;
  text-align: left;
  transition: background-color var(--sbi-duration-fast) var(--sbi-ease-out), color var(--sbi-duration-fast) var(--sbi-ease-out);
  border-radius: var(--sbi-radius-sm);
  font-weight: var(--sbi-font-weight-regular);
}

/* Hover state matching MacBook selection highlight (sleek blue selection) */
.nav-dropdown-menu li a:hover {
  background-color: var(--sbi-nav-dropdown-highlight) !important; /* Force sleek blue highlight */
  color: var(--sbi-text-on-accent) !important;
}

/* Remove active border underline styles for links inside the dropdown */
.nav-dropdown-menu li a::after {
  display: none !important;
}

/* ─── Responsive ─────────────────────────────────────────────────────── */
@media (max-width: 768px) {
  .nav-container {
    padding: 16px 20px 12px 20px;
    flex-direction: column;
    align-items: center;
    gap: 12px;
  }

  .nav-links-nav {
    overflow: hidden; /* Restore clipping on mobile */
  }

  .nav-links-list {
    width: 100%;
    justify-content: center;
    padding-bottom: 4px;
    overflow-x: auto; /* Restore horizontal scrolling on mobile */
  }
}