/* wwwroot/css/nav.css */
.nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
  height: 64px; display: flex; align-items: center;
  background: transparent;
  transition: background var(--dur-slow) var(--ease),
              backdrop-filter var(--dur-slow) var(--ease),
              border-bottom var(--dur-slow) var(--ease),
              transform var(--dur-base) var(--ease);
}
.nav.is-scrolled {
  background: rgba(6,10,16,0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 0.5px solid #0F1828;
}
.nav.is-hidden { transform: translateY(-100%); }
.nav__inner { display: flex; align-items: center; justify-content: space-between; width: 100%; }

/* LOGO */
.nav__logo { display: flex; align-items: center; gap: 12px; }
.nav__logo svg,
.nav__logo .mastership-mark {
  width: 60px;
  height: 60px;
  min-width: 60px;
  flex-shrink: 0;
}
.nav__brand {
  font-size: 20px;
  font-weight: 700;
  color: #C8D8E8;
  letter-spacing: 3px;
  text-transform: uppercase;
}

/* LINKS */
.nav__links { display: flex; align-items: center; gap: var(--sp-8); }
.nav__link { font-size: var(--text-base); color: var(--text-muted); transition: color var(--dur-fast) var(--ease); }
.nav__link:hover { color: var(--c-ice); }
.nav__link.is-active { color: var(--c-ice); }
.nav__link--cta { padding: 7px 18px; border: 0.5px solid var(--text-muted); border-radius: var(--radius-md); color: var(--text-secondary); }
.nav__link--cta:hover { border-color: var(--c-core); background: rgba(91,127,166,0.08); color: var(--c-ice); }

/* BURGER */
.nav__burger { display: none; flex-direction: column; gap: 5px; padding: 8px; }
.nav__burger span { display: block; width: 22px; height: 1.5px; background: var(--text-muted); border-radius: 2px; transition: all var(--dur-base) var(--ease); }

/* ─── THEME TOGGLE ─────────────────────────────────────────────────────── */
.theme-toggle {
  background: none;
  border: none;
  padding: 0;
  cursor: pointer;
  outline: none;
  flex-shrink: 0;
}
.theme-toggle:focus-visible .toggle-track {
  outline: 2px solid #5B7FA6;
  outline-offset: 3px;
}

.toggle-track {
  display: block;
  width: 44px;
  height: 24px;
  background: #0D1520;
  border: 0.5px solid var(--text-muted);
  border-radius: 999px;
  position: relative;
  transition: background 300ms cubic-bezier(0.16,1,0.3,1),
              border-color 300ms ease;
}
.theme-toggle:hover .toggle-track { border-color: #5B7FA6; }

.toggle-thumb {
  position: absolute;
  top: 3px;
  left: 3px;
  width: 18px;
  height: 18px;
  background: var(--bg-raised);
  border: 0.5px solid var(--text-muted);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: transform 300ms cubic-bezier(0.16,1,0.3,1),
              background 300ms ease,
              border-color 300ms ease;
}

.toggle-icon { display: flex; align-items: center; justify-content: center; }
.toggle-icon--dark  { display: flex; }
.toggle-icon--light { display: none; }

/* Light mode toggle state */
[data-theme="light"] .toggle-track {
  background: #E2EAF4;
  border-color: #8BAFD4;
}
[data-theme="light"] .theme-toggle:hover .toggle-track { border-color: #1A2D45; }
[data-theme="light"] .toggle-thumb {
  transform: translateX(20px);
  background: #C8D8E8;
  border-color: #5B7FA6;
}
[data-theme="light"] .toggle-icon--dark  { display: none; }
[data-theme="light"] .toggle-icon--light { display: flex !important; }

/* ─── LIGHT MODE NAV OVERRIDES ─────────────────────────────────────────── */
[data-theme="light"] .nav.is-scrolled {
  background: rgba(240,244,248,0.92);
  border-bottom-color: #B8CCE0;
}

/* ─── RESPONSIVE ───────────────────────────────────────────────────────── */
@media (max-width: 768px) {
  .nav__burger { display: flex; }
  .nav__links {
    position: fixed; inset: 0; flex-direction: column; justify-content: center;
    background: rgba(6,10,16,0.98); backdrop-filter: blur(20px);
    opacity: 0; pointer-events: none; transition: opacity var(--dur-base) var(--ease);
    gap: var(--sp-8);
  }
  .nav__links.is-open { opacity: 1; pointer-events: all; }
  .nav__link { font-size: var(--text-2xl); }
  .theme-toggle { display: none; }

  [data-theme="light"] .nav__links {
    background: rgba(240,244,248,0.98);
  }
}