/* ============================================================
   AVISHKAARI PORTFOLIO — NAVIGATION
   ============================================================ */

#main-nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: var(--z-nav);
  height: var(--nav-h);
  padding: 0 var(--section-px);
  display: flex;
  align-items: center;
  justify-content: space-between;
  transition:
    background var(--t-slow) ease,
    backdrop-filter var(--t-slow) ease,
    border-bottom var(--t-slow) ease;
}
#main-nav.scrolled {
  background: rgba(6, 6, 8, 0.82);
  backdrop-filter: blur(24px) saturate(160%);
  -webkit-backdrop-filter: blur(24px) saturate(160%);
  border-bottom: 1px solid var(--border);
}
[data-theme="light"] #main-nav.scrolled {
  background: rgba(244, 242, 238, 0.88);
}

/* --- Logo --- */
.nav-logo {
  font-family: var(--font-display);
  font-size: 26px;
  letter-spacing: 5px;
  color: var(--text);
  text-decoration: none;
  cursor: pointer;
  flex-shrink: 0;
  transition: opacity var(--t-fast);
}
.nav-logo:hover { opacity: 0.8; }
.nav-logo span { color: var(--accent); }

/* --- Links --- */
.nav-links {
  display: flex;
  align-items: center;
  gap: 36px;
  list-style: none;
}
.nav-links a {
  font-family: var(--font-head);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--text2);
  text-decoration: none;
  cursor: pointer;
  position: relative;
  padding-bottom: 4px;
  transition: color var(--t-fast);
}
.nav-links a::after {
  content: '';
  position: absolute;
  bottom: 0; left: 0;
  width: 0; height: 1px;
  background: var(--accent);
  transition: width var(--t-med) var(--ease-out);
}
.nav-links a:hover,
.nav-links a.active {
  color: var(--text);
}
.nav-links a:hover::after,
.nav-links a.active::after {
  width: 100%;
}

/* --- CTA --- */
.nav-cta {
  font-family: var(--font-head);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 1px;
  padding: 10px 22px;
  background: var(--accent);
  color: var(--bg);
  border-radius: 5px;
  text-decoration: none;
  cursor: pointer;
  flex-shrink: 0;
  transition:
    box-shadow var(--t-med) ease,
    transform var(--t-fast) var(--ease-out);
}
.nav-cta:hover {
  box-shadow: 0 0 28px var(--glow), 0 4px 20px rgba(var(--accent-rgb), 0.2);
  transform: translateY(-1px);
}

/* --- Hamburger --- */
.nav-hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  z-index: 10;
  padding: 4px;
}
.nav-hamburger span {
  display: block;
  width: 22px; height: 1.5px;
  background: var(--text);
  border-radius: 2px;
  transform-origin: center;
  transition: transform var(--t-med) var(--ease-out), opacity var(--t-fast);
}
.nav-hamburger.open span:nth-child(1) { transform: translateY(6.5px) rotate(45deg); }
.nav-hamburger.open span:nth-child(2) { opacity: 0; transform: scaleX(0); }
.nav-hamburger.open span:nth-child(3) { transform: translateY(-6.5px) rotate(-45deg); }

/* --- Mobile full-screen menu --- */
.mobile-menu {
  position: fixed;
  inset: 0;
  z-index: calc(var(--z-nav) - 5);
  background: rgba(6,6,8,0.97);
  backdrop-filter: blur(30px);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 8px;
  opacity: 0;
  visibility: hidden;
  transition:
    opacity var(--t-slow) var(--ease-out),
    visibility var(--t-slow);
}
.mobile-menu.open {
  opacity: 1;
  visibility: visible;
}
.mobile-menu a {
  font-family: var(--font-display);
  font-size: clamp(40px, 10vw, 72px);
  letter-spacing: 4px;
  color: var(--text);
  text-decoration: none;
  cursor: pointer;
  padding: 8px 24px;
  position: relative;
  transition: color var(--t-fast);
  transform: translateY(20px);
  opacity: 0;
  transition: transform var(--t-slow) var(--ease-out), opacity var(--t-slow), color var(--t-fast);
}
.mobile-menu.open a {
  transform: none;
  opacity: 1;
}
.mobile-menu a:nth-child(1) { transition-delay: 0.05s; }
.mobile-menu a:nth-child(2) { transition-delay: 0.10s; }
.mobile-menu a:nth-child(3) { transition-delay: 0.15s; }
.mobile-menu a:nth-child(4) { transition-delay: 0.20s; }
.mobile-menu a:hover { color: var(--accent); }

/* Page transition curtain */
.page-curtain {
  position: fixed;
  inset: 0;
  z-index: calc(var(--z-nav) + 10);
  background: var(--bg2);
  transform: scaleY(0);
  transform-origin: bottom;
  pointer-events: none;
}

/* --- Responsive --- */
@media (max-width: 900px) {
  .nav-links, .nav-cta { display: none; }
  .nav-hamburger { display: flex; }
}