/* =============================================================
   NAVIGATION
   Sticky, quiet, unobtrusive. A subtle surface appears only
   once the page has been scrolled.
   ============================================================= */

.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--nav-height);
  display: flex;
  align-items: center;
  background: color-mix(in srgb, var(--color-bg) 88%, transparent);
  backdrop-filter: saturate(1.2) blur(10px);
  border-bottom: 1px solid transparent;
  transition:
    border-color var(--dur) var(--ease),
    background-color var(--dur) var(--ease);
}

/* Applied by JS once the page is scrolled */
.nav.is-scrolled {
  border-bottom-color: var(--color-border);
}

/* Three balanced regions: brand (fixed), links (centered in the
   remaining space), resume (fixed) — not a two-child space-between,
   which reads as brand-left/links-right rather than truly centered. */
.nav__inner {
  display: flex;
  align-items: center;
  width: 100%;
}

/* Wordmark — "aw#". Typography only; the trailing # is the one
   persistent spot of accent in the page chrome. Becomes the favicon. */
.nav__brand {
  flex: 0 0 auto;
  font-weight: var(--weight-semibold);
  letter-spacing: -0.04em;
  font-size: var(--text-lg);
  line-height: 1;
  color: var(--color-text);
}

.nav__brand-mark {
  color: var(--color-accent);
}

/* --- Links — centered in the flexible middle region --------- */
.nav__links {
  flex: 1 1 auto;
  min-width: 0;
  display: flex;
  justify-content: center;
}

.nav__list {
  display: flex;
  align-items: center;
  gap: var(--space-5);
}

.nav__link {
  font-size: var(--text-sm);
  font-weight: var(--weight-medium);
  color: var(--color-text-secondary);
  padding-block: var(--space-2);
  transition: color var(--dur) var(--ease), opacity var(--dur) var(--ease);
}

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

/* Active section indicator — the one place nav chrome carries the accent */
.nav__link.is-active {
  color: var(--color-accent);
}

/* Playground reads as a separate destination */
.nav__link--alt {
  color: var(--color-text-secondary);
}

/* Resume exists twice in the markup: a desktop pill pinned to the
   right edge, and a copy inside the mobile flyout. Only one is ever
   visible — display:none removes the other from focus/AT order. */
.nav__resume-mobile {
  display: none;
}

.nav__resume-desktop {
  flex: 0 0 auto;
  margin-left: var(--space-4);
}

.nav__resume {
  display: inline-flex;
}

/* --- Mobile toggle ----------------------------------------- */
.nav__toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 40px;
  height: 40px;
  padding: 0;
  background: transparent;
  border: none;
  cursor: pointer;
}

.nav__toggle-bar {
  display: block;
  width: 20px;
  height: 1.5px;
  margin-inline: auto;
  background: var(--color-text);
  transition: transform var(--dur) var(--ease), opacity var(--dur) var(--ease);
}

/* Toggle → close (X) when open */
.nav__toggle[aria-expanded='true'] .nav__toggle-bar:first-child {
  transform: translateY(3.25px) rotate(45deg);
}

.nav__toggle[aria-expanded='true'] .nav__toggle-bar:last-child {
  transform: translateY(-3.25px) rotate(-45deg);
}

/* --- Responsive: mobile menu ------------------------------- */
@media (max-width: 720px) {
  .nav__toggle {
    display: flex;
  }

  .nav__resume-desktop {
    display: none;
  }

  /* .nav__links goes to position:fixed below, which removes it
     from .nav__inner's flex flow — without this, brand and toggle
     are the only two flex items left and collapse together at the
     start of the row instead of sitting at opposite ends. */
  .nav__inner {
    justify-content: space-between;
  }

  .nav__links {
    position: fixed;
    inset: var(--nav-height) 0 auto 0;
    justify-content: normal;
    background: var(--color-bg);
    border-bottom: 1px solid var(--color-border);
    border-radius: 0 0 var(--radius-lg) var(--radius-lg);
    box-shadow: var(--shadow-lg);
    /* Collapsed by default; JS toggles .is-open */
    transform: translateY(-8px);
    opacity: 0;
    pointer-events: none;
    transition:
      transform var(--dur) var(--ease),
      opacity var(--dur) var(--ease);
  }

  .nav__links.is-open {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
  }

  .nav__list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    padding: var(--space-7) var(--gutter) var(--space-6);
  }

  .nav__link {
    display: block;
    padding-block: var(--space-5);
    font-size: var(--text-md);
    border-bottom: 1px solid var(--color-border);
  }

  .nav__resume-mobile {
    display: block;
    margin-top: var(--space-6);
  }

  /* Full-width so its edges line up with the nav items above it,
     which fill the same padded list width. */
  .nav__resume-mobile .nav__resume {
    width: 100%;
    justify-content: center;
  }
}