/* ============================================================
   NAV.CSS — Navigation styles
   ============================================================ */

.nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  height: var(--nav-h);
  display: flex;
  align-items: center;
  padding-inline: var(--sp-6);
  gap: var(--sp-6);
  background: rgba(8,12,20,0.75);
  backdrop-filter: blur(20px) saturate(1.3);
  -webkit-backdrop-filter: blur(20px) saturate(1.3);
  border-bottom: 1px solid var(--clr-border);
  transition: background var(--dur-base), border-color var(--dur-base);
}
html.light .nav { background: rgba(245,247,252,0.82); }
.nav.scrolled { background: rgba(8,12,20,0.95); box-shadow: 0 2px 20px rgba(0,0,0,.4); }
html.light .nav.scrolled { background: rgba(245,247,252,0.96); }

.nav-brand {
  font-size: var(--fs-xl);
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--clr-text);
  flex-shrink: 0;
}
.nav-brand .dot { color: var(--clr-accent); }

.nav-links {
  display: flex;
  align-items: center;
  gap: var(--sp-1);
  flex: 1;
  justify-content: center;
}
.nav-links a {
  padding: var(--sp-2) var(--sp-3);
  border-radius: var(--radius-md);
  font-size: var(--fs-sm);
  font-weight: 500;
  color: var(--clr-text-dim);
  transition: color var(--dur-fast), background var(--dur-fast);
  position: relative;
}
.nav-links a:hover, .nav-links a.active {
  color: var(--clr-text);
  background: rgba(255,255,255,0.06);
}
.nav-links a.active::after {
  content: '';
  position: absolute;
  bottom: -2px; left: 50%;
  transform: translateX(-50%);
  width: 16px; height: 2px;
  background: var(--clr-accent);
  border-radius: var(--radius-full);
}

.nav-tools { display: flex; align-items: center; gap: var(--sp-2); flex-shrink: 0; }

.nav-cta {
  display: inline-flex;
  align-items: center;
  gap: var(--sp-2);
  padding: var(--sp-2) var(--sp-5);
  background: var(--grad-brand);
  color: #fff !important;
  border-radius: var(--radius-full);
  font-size: var(--fs-sm);
  font-weight: 600;
  transition: transform var(--dur-fast), box-shadow var(--dur-fast);
  box-shadow: 0 0 18px rgba(56,189,248,0.2);
}
.nav-cta:hover { transform: translateY(-2px); box-shadow: 0 0 28px rgba(56,189,248,0.4); }

/* Theme icons */
.t-dark { display: none; } .t-light { display: block; }
html.light .t-dark { display: block; } html.light .t-light { display: none; }

/* Hamburger */
.nav-hamburger { display: none; flex-direction: column; gap: 5px; width: 28px; padding: 4px; }
.nav-hamburger span { display: block; height: 2px; background: var(--clr-text-dim); border-radius: var(--radius-full); transition: all var(--dur-base); }

/* Mobile nav */
.mobile-nav {
  display: none;
  position: fixed;
  top: var(--nav-h); left: 0; right: 0;
  background: var(--clr-surface);
  border-bottom: 1px solid var(--clr-border);
  padding: var(--sp-4) var(--sp-6);
  flex-direction: column;
  gap: var(--sp-2);
  z-index: 99;
  transform: translateY(-120%);
  transition: transform var(--dur-base) var(--ease-out);
}
.mobile-nav.open { transform: translateY(0); }
.mobile-nav a { padding: var(--sp-3) var(--sp-4); border-radius: var(--radius-md); font-size: var(--fs-base); font-weight: 500; color: var(--clr-text-dim); transition: color var(--dur-fast), background var(--dur-fast); }
.mobile-nav a:hover, .mobile-nav a.active { color: var(--clr-text); background: rgba(255,255,255,0.06); }

@media (max-width: 768px) {
  .nav-links { display: none; }
  .nav-cta   { display: none; }
  .nav-hamburger { display: flex; }
  .mobile-nav    { display: flex; }
}
@media (max-width: 480px) { .nav { padding-inline: var(--sp-4); } }