/* =============================================
   VYALA.TECH — NAV CSS
   ============================================= */

.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  height: var(--nav-height);
  display: flex;
  align-items: center;
  transition: background-color var(--transition), border-color var(--transition), backdrop-filter var(--transition);
}

.nav.scrolled {
  background: rgba(9, 9, 15, 0.82);
  border-bottom: 1px solid rgba(255,255,255,0.07);
  backdrop-filter: blur(18px) saturate(180%);
  -webkit-backdrop-filter: blur(18px) saturate(180%);
  box-shadow: 0 1px 0 rgba(255,255,255,0.04);
}

[data-theme="light"] .nav.scrolled {
  background: rgba(250, 250, 250, 0.88);
}

.nav-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 24px;
}

/* Logo */
.nav-logo {
  font-size: 1.35rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  color: var(--text-primary);
  transition: color var(--transition);
  flex-shrink: 0;
}

.nav-logo span {
  color: var(--accent);
}

.nav-logo:hover {
  color: var(--accent-light);
}

/* Links */
.nav-links {
  display: flex;
  align-items: center;
  gap: 4px;
}

.nav-links a {
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--text-secondary);
  padding: 8px 14px;
  border-radius: var(--radius-sm);
  transition: all var(--transition);
  position: relative;
}

.nav-links a:hover {
  color: var(--text-primary);
  background: var(--accent-glow);
}

/* active link — set via JS */
.nav-links a.nav-active {
  color: var(--text-primary);
  font-weight: 600;
}

.nav-links a.nav-active::after {
  content: '';
  position: absolute;
  bottom: 2px;
  left: 14px;
  right: 14px;
  height: 2px;
  background: var(--accent-light);
  border-radius: 2px;
}

/* Actions */
.nav-actions {
  display: flex;
  align-items: center;
  gap: 12px;
}

/* Theme Toggle */
.theme-toggle {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-secondary);
  transition: all var(--transition);
  cursor: pointer;
  background: transparent;
  border: 1px solid transparent;
}

.theme-toggle:hover {
  color: var(--text-primary);
  background: var(--bg-hover);
  border-color: var(--border);
}

.theme-toggle svg {
  width: 18px;
  height: 18px;
  transition: all var(--transition);
}

.theme-toggle .icon-sun { display: none; }
.theme-toggle .icon-moon { display: block; }

[data-theme="light"] .theme-toggle .icon-sun { display: block; }
[data-theme="light"] .theme-toggle .icon-moon { display: none; }

/* Mobile hamburger */
.nav-hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  cursor: pointer;
  padding: 8px;
  border-radius: var(--radius-sm);
  transition: background var(--transition);
}

.nav-hamburger:hover {
  background: var(--bg-hover);
}

.nav-hamburger span {
  display: block;
  width: 22px;
  height: 1.5px;
  background: var(--text-secondary);
  transition: all var(--transition);
  border-radius: 2px;
}

.nav-hamburger.open span:nth-child(1) {
  transform: translateY(6.5px) rotate(45deg);
}

.nav-hamburger.open span:nth-child(2) {
  opacity: 0;
}

.nav-hamburger.open span:nth-child(3) {
  transform: translateY(-6.5px) rotate(-45deg);
}

/* Mobile menu */
.nav-mobile {
  position: fixed;
  top: var(--nav-height);
  left: 0;
  right: 0;
  background: var(--bg-secondary);
  border-bottom: 1px solid var(--border);
  padding: 16px 24px 24px;
  display: flex;
  flex-direction: column;
  gap: 4px;
  transform: translateY(-100%);
  opacity: 0;
  transition: transform var(--transition), opacity var(--transition);
  z-index: 999;
  pointer-events: none;
}

.nav-mobile.open {
  transform: translateY(0);
  opacity: 1;
  pointer-events: all;
}

.nav-mobile a {
  font-size: 1rem;
  font-weight: 500;
  color: var(--text-secondary);
  padding: 12px 16px;
  border-radius: var(--radius-md);
  transition: all var(--transition);
}

.nav-mobile a:hover {
  color: var(--text-primary);
  background: var(--bg-hover);
}

.nav-mobile-divider {
  height: 1px;
  background: var(--border);
  margin: 8px 0;
}

.nav-mobile-actions {
  display: flex;
  gap: 10px;
  padding-top: 8px;
}

.nav-mobile-actions .btn {
  flex: 1;
  justify-content: center;
}

@media (max-width: 900px) {
  .nav-links { display: none; }
  .nav-actions .btn { display: none; }
  .nav-hamburger { display: flex; }
}

@media (max-width: 480px) {
  .nav-inner { padding: 0 16px; }
}