/* ===========================
   nav.css — Navigation Styles
   =========================== */

.nav {
  position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
  padding: 1.25rem 0; transition: var(--transition);
}
.nav.scrolled {
  background: rgba(10,10,10,0.85);
  backdrop-filter: blur(20px) saturate(1.5);
  -webkit-backdrop-filter: blur(20px) saturate(1.5);
  border-bottom: 1px solid var(--border);
  padding: 0.85rem 0;
}
[data-theme="light"] .nav.scrolled {
  background: rgba(245,245,245,0.85);
}
.nav-inner {
  display: flex; align-items: center; justify-content: space-between;
}

/* Logo */
.nav-logo {
  display: flex; align-items: center; gap: 0.75rem;
  font-family: var(--font-heading); font-weight: 700;
  text-decoration: none; color: var(--text);
  transition: var(--transition);
}
.nav-logo:hover { opacity: 0.8; }
.logo-box {
  display: grid; grid-template-columns: 1fr 1fr; gap: 2px;
  width: 36px; height: 36px;
}
.logo-box span {
  background: var(--white); color: var(--black);
  display: flex; align-items: center; justify-content: center;
  font-size: 0.65rem; font-weight: 700; line-height: 1;
}
[data-theme="light"] .logo-box span { background: var(--black); color: var(--white); }
.nav-logo-text { font-size: 1rem; letter-spacing: -0.02em; }

/* Desktop Links */
.nav-links {
  display: flex; align-items: center; gap: 0.25rem;
}
.nav-link {
  padding: 0.5rem 1rem; border-radius: var(--radius-full);
  font-family: var(--font-heading); font-size: 0.875rem; font-weight: 500;
  color: var(--text-muted); transition: var(--transition);
  position: relative;
}
.nav-link::after {
  content: ''; position: absolute; bottom: 6px; left: 50%; transform: translateX(-50%);
  width: 4px; height: 4px; background: var(--white); border-radius: 50%;
  opacity: 0; transition: var(--transition);
}
.nav-link:hover { color: var(--text); background: var(--bg-elevated); }
.nav-link.active { color: var(--text); }
.nav-link.active::after { opacity: 1; }

/* Right Controls */
.nav-controls {
  display: flex; align-items: center; gap: 1rem;
}

/* Language Toggle */
.lang-toggle {
  display: flex; align-items: center; gap: 0; overflow: hidden;
  border: 1px solid var(--border); border-radius: var(--radius-full);
}
.lang-btn {
  padding: 0.4rem 0.85rem;
  font-family: var(--font-heading); font-size: 0.75rem; font-weight: 600;
  letter-spacing: 0.05em; color: var(--text-muted);
  transition: var(--transition); background: transparent;
}
.lang-btn.active {
  background: var(--white); color: var(--black);
}
[data-theme="light"] .lang-btn.active { background: var(--black); color: var(--white); }

/* Theme Toggle */
.nav-theme-toggle {
  width: 36px; height: 36px; border-radius: 50%;
  border: 1px solid var(--border); display: flex; align-items: center; justify-content: center;
  font-size: 1rem; transition: var(--transition); color: var(--text-muted);
  cursor: pointer;
}
.nav-theme-toggle:hover { border-color: var(--text); color: var(--text); background: var(--bg-elevated); }

/* Mobile Hamburger */
.nav-hamburger {
  display: none; flex-direction: column; gap: 5px; cursor: pointer;
  padding: 0.5rem; border-radius: var(--radius-sm);
  transition: var(--transition);
}
.nav-hamburger span {
  display: block; width: 24px; height: 1.5px; background: var(--text);
  transition: var(--transition); transform-origin: center;
}
.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 Menu */
.mobile-menu {
  position: fixed; inset: 0; background: var(--bg);
  z-index: 999; display: flex; flex-direction: column;
  align-items: center; justify-content: center; gap: 1rem;
  opacity: 0; visibility: hidden; transition: opacity var(--transition-slow), visibility var(--transition-slow);
  pointer-events: none;
}
.mobile-menu.open { opacity: 1; visibility: visible; pointer-events: all; }
.mobile-menu .mobile-link {
  font-family: var(--font-heading); font-size: clamp(2.5rem, 8vw, 5rem);
  font-weight: 700; color: var(--text); letter-spacing: -0.03em;
  transform: translateY(30px); opacity: 0;
  transition: transform var(--transition-slow), opacity var(--transition-slow), color var(--transition);
}
.mobile-menu.open .mobile-link {
  transform: translateY(0); opacity: 1;
}
.mobile-menu.open .mobile-link:nth-child(1) { transition-delay: 0.1s; }
.mobile-menu.open .mobile-link:nth-child(2) { transition-delay: 0.15s; }
.mobile-menu.open .mobile-link:nth-child(3) { transition-delay: 0.2s; }
.mobile-menu.open .mobile-link:nth-child(4) { transition-delay: 0.25s; }
.mobile-menu .mobile-link:hover { color: var(--text-muted); }
.mobile-menu-footer {
  position: absolute; bottom: 2rem; left: 0; right: 0;
  display: flex; align-items: center; justify-content: center; gap: 1.5rem;
  opacity: 0; transition: opacity 0.4s ease 0.4s;
}
.mobile-menu.open .mobile-menu-footer { opacity: 1; }

@media (max-width: 768px) {
  .nav-links { display: none; }
  .nav-hamburger { display: flex; }
  .nav-controls .lang-toggle { font-size: 0.7rem; }
}