/* ============================================================
   NAV
   Sticky top navigation bar: logo, desktop links, action buttons,
   dark/light theme toggle icon button, and the mobile hamburger menu.
   Includes mobile breakpoint (≤768px) and smallest phones (≤480px).
   ============================================================ */


/* ── Sticky bar: blends with page background and transitions with theme ── */
.nav-glass {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--color-bg);
  border-bottom: 1px solid var(--color-hairline);
  transition:
    background-color var(--duration-theme) var(--ease-out),
    border-color var(--duration-theme) var(--ease-out);
}

/* ── Inner wrapper: constrained width, flex row ── */
.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 1rem 2rem;
}

/* ── Logo: icon + wordmark side by side ── */
.nav-logo {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-shrink: 0;
}

.nav-logo:hover {
  color: var(--color-text);
}

.nav-logo__mark {
  width: 40px;
  height: 40px;
  flex-shrink: 0;
  border-radius: 8px;
  object-fit: cover;
  display: block;
  transition: opacity 0.2s var(--ease-out);
}

.nav-logo:hover .nav-logo__mark {
  opacity: 0.88;
}

.nav-logo__text {
  position: relative;
  font-family: var(--font-display);
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1;
}

/* Animated underline — matches nav link hover */
.nav-logo__text::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 100%;
  height: 2px;
  background: var(--color-blue);
  border-radius: 1px;
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 0.85s var(--ease-out);
}

.nav-logo:hover .nav-logo__text::after {
  transform: scaleX(1);
}

.nav-logo:focus-visible {
  outline: 2px solid var(--color-text);
  outline-offset: 3px;
  border-radius: 4px;
}

/* "Detailing" sub-label beneath the brand name */
.nav-logo__text span {
  color: var(--color-blue);
  font-family: var(--font-body);
  font-weight: 500;
  font-size: 0.8125rem;
  display: block;
  margin-top: 2px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  transition: color 0.2s var(--ease-out);
}

/* ── Desktop navigation links ── */
.nav-links {
  display: flex;
  align-items: center;
  gap: 2rem;
  list-style: none;
}

.nav-links a {
  position: relative;
  font-size: 0.9375rem;
  font-weight: 400;
  color: var(--color-text-muted);
}

/* Animated underline via ::after — grows in from the left using scaleX */
.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 100%;
  height: 2px;
  background: var(--color-blue);
  border-radius: 1px;
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 0.85s var(--ease-out);
}

.nav-links a:hover {
  color: var(--color-text);
}

.nav-links a:hover::after {
  transform: scaleX(1);
}

/* Active section link highlighted with brand blue (set by JS on scroll) */
.nav-links a.is-active {
  color: var(--color-blue);
}

.nav-links a.is-active::after {
  transform: scaleX(1);
}

.nav-links a:focus-visible {
  outline: 2px solid var(--color-text);
  outline-offset: 3px;
}

/* CTA button — no text underline; uses border draw-in instead (see below) */
.nav-links__cta a::after {
  display: none;
}

/* ── Right-side action group: theme toggle + CTA button + hamburger ── */
.nav-actions {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-shrink: 0;
}

/* Compact size for nav-embedded buttons */
.nav-actions .btn {
  padding: 0.5rem 1.125rem;
  font-size: 0.875rem;
}

/* ── Theme toggle: square icon button that swaps sun/moon SVG ── */
.theme-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  min-width: 44px;
  min-height: 44px;
  padding: 0;
  flex-shrink: 0;
  border: 1px solid var(--color-hairline);
  border-radius: var(--radius-panel);
  background: transparent;
  color: var(--color-text-muted);
  cursor: pointer;
  transition:
    border-color var(--duration-theme) var(--ease-out),
    color 0.2s var(--ease-out);
}

.theme-toggle:hover {
  border-color: var(--color-text-muted);
  color: var(--color-text);
}

.theme-toggle:focus-visible {
  outline: 2px solid var(--color-text);
  outline-offset: 2px;
}

.theme-toggle:active {
  transform: scale(0.96);
}

.theme-toggle svg {
  width: 17px;
  height: 17px;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.75;
  stroke-linecap: round;
  stroke-linejoin: round;
}

/* Show/hide sun vs moon icon based on current theme attribute */
.theme-toggle__icon--sun  { display: none; }
.theme-toggle__icon--moon { display: block; }
[data-theme="dark"]  .theme-toggle__icon--sun  { display: block; }
[data-theme="dark"]  .theme-toggle__icon--moon { display: none; }
[data-theme="light"] .theme-toggle__icon--sun  { display: none; }
[data-theme="light"] .theme-toggle__icon--moon { display: block; }

/* ── Mobile hamburger toggle (hidden on desktop) ── */
.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  width: 44px;
  height: 44px;
  min-width: 44px;
  min-height: 44px;
  padding: 0;
  border: 1px solid var(--color-hairline);
  border-radius: var(--radius-panel);
  background: transparent;
  cursor: pointer;
  flex-shrink: 0;
  transition: border-color 0.2s var(--ease-out);
}

.nav-toggle:hover {
  border-color: var(--color-text-muted);
}

.nav-toggle:focus-visible {
  outline: 2px solid var(--color-text);
  outline-offset: 2px;
}

/* Each bar of the hamburger icon */
.nav-toggle__bar {
  display: block;
  width: 18px;
  height: 1.5px;
  background: var(--color-text);
  transition:
    transform 0.3s var(--ease-out),
    opacity 0.3s var(--ease-out);
}

/* Animate the three bars into an × when the menu is open */
.nav-glass.is-menu-open .nav-toggle__bar:nth-child(1) {
  transform: translateY(6.5px) rotate(45deg);
}

.nav-glass.is-menu-open .nav-toggle__bar:nth-child(2) {
  opacity: 0;
  transform: scaleX(0);
}

.nav-glass.is-menu-open .nav-toggle__bar:nth-child(3) {
  transform: translateY(-6.5px) rotate(-45deg);
}

/* Mobile CTA inside the nav drawer — hidden on desktop */
.nav-links__cta {
  display: none;
}

/* Prevent body scroll while the mobile menu is open */
body.is-nav-open {
  overflow: hidden;
}


/* ── Responsive: mobile (≤768px) ─────────────────────────────
   The nav links become a full-screen fixed drawer that slides
   down when the hamburger is toggled.
   ──────────────────────────────────────────────────────────── */
@media (max-width: 768px) {
  /* Show hamburger, hide desktop CTA button */
  .nav-toggle {
    display: flex;
  }

  .nav-actions .btn-blue {
    display: none;
  }

  .nav-inner {
    padding-top: 0.875rem;
    padding-bottom: 0.875rem;
    padding-left: max(1.25rem, env(safe-area-inset-left, 0px));
    padding-right: max(1.25rem, env(safe-area-inset-right, 0px));
  }

  /* Nav drawer: hidden by default, full-screen overlay */
  .nav-links {
    position: fixed;
    top: var(--nav-height, 4.75rem);
    left: 0;
    right: 0;
    bottom: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: 1rem;
    padding-bottom: calc(1rem + env(safe-area-inset-bottom, 0px));
    background: var(--color-bg);
    border-top: 1px solid var(--color-hairline);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition:
      opacity 0.3s var(--ease-out),
      visibility 0.3s var(--ease-out),
      transform 0.3s var(--ease-out);
    pointer-events: none;
    overflow-y: auto;
  }

  /* Nav drawer open state (toggled by JS) */
  .nav-glass.is-menu-open .nav-links {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
    pointer-events: auto;
  }

  /* Row separators between nav items */
  .nav-links li {
    border-bottom: 1px solid var(--color-hairline);
  }

  /* Full-width tap targets in the drawer (min 44px) */
  .nav-links a {
    display: flex;
    align-items: center;
    min-height: 44px;
    padding: 0.75rem;
    font-size: 1rem;
    color: var(--color-text);
  }

  /* No sliding underline in the mobile drawer */
  .nav-links a::after {
    display: none;
  }

  .nav-links a:hover {
    color: var(--color-text-muted);
  }

  .nav-links__cta .btn-blue-draw,
  .nav-links__cta .btn-blue-draw:hover {
    color: var(--color-blue);
  }

  /* Mobile-only CTA block at the bottom of the drawer */
  .nav-links__cta {
    display: block;
    margin-top: 0.75rem;
    padding-top: 0.75rem;
    border-bottom: none;
  }

  .nav-links__cta .btn {
    width: 100%;
    min-height: 44px;
    padding: 0.875rem 1.5rem;
  }
}

/* ── Responsive: smallest phones (≤480px) ── */
@media (max-width: 480px) {
  .nav-inner {
    padding-top: 0.625rem;
    padding-bottom: 0.625rem;
    padding-left: max(1rem, env(safe-area-inset-left, 0px));
    padding-right: max(1rem, env(safe-area-inset-right, 0px));
  }
}