/* ============================================================
   nav.css — Navigation Bar
   aharsh.com | Sprint 1
   ============================================================ */

/* ------------------------------------------------------------
   Nav Container
   ------------------------------------------------------------ */
#nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  height: var(--nav-height);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 clamp(24px, 5vw, 60px);

  /* Starts transparent over the hero */
  background: transparent;
  transition:
    background   0.5s var(--ease-smooth),
    border-color 0.5s var(--ease-smooth);
  will-change: background;
}

/* Applied by JS when page is scrolled > 60px */
#nav.scrolled {
  background: rgba(15, 15, 13, 0.90);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--border);
}

/* ------------------------------------------------------------
   Logo
   ------------------------------------------------------------ */
.nav-logo a {
  display: flex;
  align-items: center;
}

/* Logo image — transparent background, shows directly over dark nav */
.nav-signature {
  height: 44px;
  width: auto;
  opacity: 0.92;
  transition: opacity 0.3s;
  display: block;
}

.nav-signature:hover {
  opacity: 1;
}

/* Text fallback — only shown if img fails to load */
.nav-logo-text {
  font-family: var(--font-serif);
  font-size: 20px;
  font-weight: 300;
  letter-spacing: 0.18em;
  color: var(--text-primary);
  transition: color 0.3s;
  display: none;
}
.nav-logo-text:hover {
  color: var(--accent);
}

/* ------------------------------------------------------------
   Nav Links — Desktop
   ------------------------------------------------------------ */
.nav-links {
  display: flex;
  align-items: center;
  gap: clamp(20px, 3vw, 48px);
}

.nav-link {
  font-family: var(--font-sans);
  font-size: 10.5px;
  font-weight: 400;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--text-secondary);
  position: relative;
  transition: color 0.3s;
}

/* Animated underline */
.nav-link::after {
  content: '';
  position: absolute;
  bottom: -3px;
  left: 0;
  width: 0;
  height: 1px;
  background: var(--accent);
  transition: width 0.35s var(--ease-smooth);
}

.nav-link:hover,
.nav-link.active {
  color: var(--text-primary);
}

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

/* ------------------------------------------------------------
   Mobile Hamburger Toggle
   ------------------------------------------------------------ */
.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 6px;
  padding: 6px;
  z-index: 1010;
  transition: opacity 0.2s;
}

.nav-toggle:hover {
  opacity: 0.7;
}

.nav-toggle span {
  display: block;
  width: 22px;
  height: 1px;
  background: var(--text-primary);
  transition:
    transform 0.35s var(--ease-expo),
    opacity   0.2s;
  transform-origin: center;
}

/* X state when menu is open */
.nav-toggle.open span:first-child {
  transform: translateY(7px) rotate(45deg);
}
.nav-toggle.open span:last-child {
  transform: translateY(-7px) rotate(-45deg);
}

/* ------------------------------------------------------------
   Mobile Menu — Slide-in Panel
   ------------------------------------------------------------ */
@media (max-width: 768px) {
  .nav-toggle {
    display: flex;
  }

  /* Slide-in from the right */
  .nav-links {
    position: fixed;
    top: 0;
    right: -100%;
    width: 280px;
    height: 100vh;
    background: var(--bg-secondary);
    border-left: 1px solid var(--border);
    flex-direction: column;
    justify-content: center;
    align-items: flex-start;
    gap: 30px;
    padding: 0 40px;
    transition: right 0.45s var(--ease-expo);
    z-index: 1005;
  }

  .nav-links.open {
    right: 0;
  }

  .nav-link {
    font-size: 12px;
    letter-spacing: 0.22em;
  }
}