/* ============================================================
   Armillary Labs — nav.css
   Navigation styles
   ============================================================ */

.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  height: var(--nav-height);
  display: flex;
  align-items: center;
  padding: 0 var(--space-10);
  border-bottom: 0.5px solid var(--surface-06);
  background: var(--nav-bg);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  transition: border-color var(--duration-slow) var(--ease),
              background var(--duration-slow) var(--ease);
}

/* ── Logo ───────────────────────────────────────────────────── */
.nav-logo {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 400;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--surface);
  transition: opacity var(--duration);
}

.nav-logo:hover { opacity: 0.75; }

.nav-logo svg {
  width: 22px;
  height: 22px;
  flex-shrink: 0;
}

/* ── Links ──────────────────────────────────────────────────── */
.nav-links {
  display: flex;
  align-items: center;
  gap: var(--space-8);
  margin-left: auto;
  margin-right: var(--space-5);
}

.nav-links a {
  font-size: var(--text-sm);
  font-weight: 300;
  color: var(--surface-60);
  letter-spacing: 0.04em;
  transition: color var(--duration);
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--surface);
}

/* ── CTA ────────────────────────────────────────────────────── */
.nav-cta {
  font-family: var(--font-mono) !important;
  font-size: 10px !important;
  font-weight: 400 !important;
  letter-spacing: 0.1em !important;
  text-transform: uppercase;
  color: var(--gold) !important;
  border: 0.5px solid var(--gold-40) !important;
  padding: 7px var(--space-4) !important;
  border-radius: var(--radius-sm) !important;
  transition: background var(--duration), color var(--duration) !important;
}

.nav-cta:hover {
  background: var(--gold-08) !important;
  color: var(--gold-light) !important;
}

/* ── Theme Toggle ───────────────────────────────────────────── */
.theme-toggle {
  font-family: var(--font-mono);
  font-size: 14px;
  line-height: 1;
  color: var(--surface-40);
  padding: var(--space-1) var(--space-2);
  border-radius: var(--radius-sm);
  transition: color var(--duration) var(--ease);
}

.theme-toggle::before {
  content: '◑';  /* dark mode: half-dark circle */
}

[data-theme="light"] .theme-toggle::before {
  content: '◐';  /* light mode: half-light circle */
}

.theme-toggle:hover {
  color: var(--surface);
}

/* ── Mobile hamburger (hidden by default) ───────────────────── */
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  padding: var(--space-2);
  margin-left: var(--space-3);
}

.nav-toggle span {
  display: block;
  width: 20px;
  height: 0.5px;
  background: var(--surface-60);
  transition: transform var(--duration), opacity var(--duration);
}

/* ── Responsive ─────────────────────────────────────────────── */
@media (max-width: 680px) {
  .nav-toggle { display: flex; }
  /* theme toggle shifts left to fill gap where links were */
  .theme-toggle { margin-left: auto; }

  /* Dropdown panel — collapsed by default, expands when .nav--open */
  .nav-links {
    position: absolute;
    top: var(--nav-height);
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    margin: 0;
    padding: var(--space-4) var(--space-10) var(--space-6);
    /* Solid background so page text doesn't bleed through the panel */
    background: var(--bg);
    border-bottom: 0.5px solid var(--surface-06);
    transform: translateY(-8px);
    opacity: 0;
    pointer-events: none;
    transition: opacity var(--duration) var(--ease),
                transform var(--duration) var(--ease);
  }

  .nav-links li {
    padding: var(--space-3) 0;
  }

  .nav-links a {
    font-size: var(--text-base);
  }

  .nav-links .nav-cta {
    align-self: flex-start;
  }

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

  /* Hamburger → X transform */
  .nav--open .nav-toggle span:nth-child(1) {
    transform: translateY(5.5px) rotate(45deg);
  }
  .nav--open .nav-toggle span:nth-child(2) {
    opacity: 0;
  }
  .nav--open .nav-toggle span:nth-child(3) {
    transform: translateY(-5.5px) rotate(-45deg);
  }
}