/* ==========================================================================
   Navigation — Premium Cinematic Bar
   ========================================================================== */

.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: var(--nav-height);
  background-color: hsl(240 10% 6% / 0.45);
  backdrop-filter: blur(16px) saturate(1.2);
  -webkit-backdrop-filter: blur(16px) saturate(1.2);
  border-bottom: 1px solid hsl(240 8% 20% / 0.3);
  transition: background-color var(--duration-normal) var(--ease-out-cubic),
              box-shadow var(--duration-normal) var(--ease-out-cubic),
              border-color var(--duration-normal) var(--ease-out-cubic),
              transform var(--duration-normal) var(--ease-out-cubic);
}

/* Scrolled state — denser frosted glass */
.nav--scrolled {
  background-color: hsl(240 10% 6% / 0.72);
  border-bottom-color: hsl(38 50% 40% / 0.12);
  box-shadow: 0 4px 20px hsl(0 0% 0% / 0.3);
}

.nav--hidden {
  transform: translateY(-100%);
  transition-duration: var(--duration-slow);
}

/* ---- Inner layout ---- */
.nav__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  max-width: var(--max-width);
  height: 100%;
  margin-inline: auto;
  padding-inline: var(--space-xl);
  position: relative;
  z-index: 1;
}

/* ================================================================
   Logo — Artist brand mark
   ================================================================ */
.nav__logo {
  font-family: var(--font-heading);
  font-size: 1.3rem;
  font-weight: 700;
  letter-spacing: 0.22em;
  color: var(--color-text);
  text-shadow: 0 1px 8px hsl(0 0% 0% / 0.5);
  transition: color var(--duration-fast);
  position: relative;
}

/* Subtle gold underline accent on the logo */
.nav__logo::after {
  content: "";
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 2rem;
  height: 2px;
  background: linear-gradient(90deg, var(--color-accent), transparent);
  border-radius: var(--radius-pill);
  opacity: 0.7;
  transition: width var(--duration-normal) var(--ease-out-expo),
              opacity var(--duration-fast);
}

.nav__logo:hover::after {
  width: 100%;
  opacity: 1;
}

/* ================================================================
   Nav links
   ================================================================ */
.nav__links {
  display: flex;
  gap: var(--space-xl);
}

.nav__link {
  font-family: var(--font-body);
  font-size: 0.8125rem;
  font-weight: 500;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: hsl(40 15% 78%);
  text-shadow: 0 1px 6px hsl(0 0% 0% / 0.4);
  transition: color var(--duration-fast);
  position: relative;
  padding-bottom: 2px;
}

/* Gold underline grows on hover */
.nav__link::after {
  content: "";
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: linear-gradient(90deg, var(--color-accent), var(--color-accent-hover));
  border-radius: var(--radius-pill);
  transition: width var(--duration-normal) var(--ease-out-expo);
}

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

.nav__link:hover::after,
.nav__link--active::after {
  width: 100%;
}

/* Remove text-shadow on solid bg */
.nav--scrolled .nav__link,
.nav--scrolled .nav__logo {
  text-shadow: none;
}

/* Focus-visible outlines for keyboard navigation */
.nav__link:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 4px;
  border-radius: var(--radius-sm);
}

.nav__logo:focus-visible {
  outline: 2px solid var(--color-accent);
  outline-offset: 6px;
}

/* ================================================================
   Mobile hamburger button
   ================================================================ */
.nav__toggle {
  display: none;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  color: var(--color-text);
}

.nav__toggle-line {
  display: block;
  width: 20px;
  height: 2px;
  background-color: currentColor;
  border-radius: 1px;
  position: relative;
  transition: background-color var(--duration-fast);
}

.nav__toggle-line::before,
.nav__toggle-line::after {
  content: "";
  position: absolute;
  left: 0;
  width: 100%;
  height: 2px;
  background-color: currentColor;
  border-radius: 1px;
  transition: transform var(--duration-normal) var(--ease-out-expo);
}

.nav__toggle-line::before { transform: translateY(-6px); }
.nav__toggle-line::after  { transform: translateY(6px); }

/* Hamburger → X animation */
.nav__toggle[aria-expanded="true"] .nav__toggle-line {
  background-color: transparent;
}

.nav__toggle[aria-expanded="true"] .nav__toggle-line::before {
  transform: rotate(45deg);
}

.nav__toggle[aria-expanded="true"] .nav__toggle-line::after {
  transform: rotate(-45deg);
}

/* ================================================================
   Mobile
   ================================================================ */
@media (max-width: 768px) {
  .nav__toggle { display: flex; }
  .nav__inner { padding-inline: var(--space-md); }

  .nav__links {
    position: fixed;
    top: var(--nav-height);
    left: 0;
    right: 0;
    flex-direction: column;
    align-items: center;
    gap: 0;
    padding: var(--space-md) 0;
    background-color: hsl(240 10% 6% / 0.96);
    backdrop-filter: blur(16px);
    -webkit-backdrop-filter: blur(16px);
    border-bottom: 1px solid var(--color-border);
    transform: translateY(-100%);
    opacity: 0;
    visibility: hidden;
    transition: transform var(--duration-normal) var(--ease-out-expo),
                opacity var(--duration-normal) var(--ease-out-expo),
                visibility var(--duration-normal);
  }

  .nav__links--open {
    transform: translateY(0);
    opacity: 1;
    visibility: visible;
  }

  .nav__link {
    display: block;
    padding: var(--space-sm) var(--space-xl);
    font-size: 0.875rem;
    width: 100%;
    text-align: center;
    text-shadow: none;
    opacity: 0;
    transform: translateY(-8px);
    transition: color var(--duration-fast),
                opacity var(--duration-normal) var(--ease-out-expo),
                transform var(--duration-normal) var(--ease-out-expo);
  }

  .nav__links--open .nav__link {
    opacity: 1;
    transform: translateY(0);
  }

  /* Mobile link stagger */
  .nav__links--open .nav__link:nth-child(1) { transition-delay: 50ms; }
  .nav__links--open .nav__link:nth-child(2) { transition-delay: 100ms; }
  .nav__links--open .nav__link:nth-child(3) { transition-delay: 150ms; }
  .nav__links--open .nav__link:nth-child(4) { transition-delay: 200ms; }

  /* No stagger on close */
  .nav__link { transition-delay: 0ms; }

}