/* ============================================================
   AlgoVik Theme — nav.css
   Top navigation bar + mobile menu
   ============================================================ */

#main-nav {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 1000;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 4vw;
  background: rgba(4,8,18,0.88);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid rgba(27,79,255,0.15);
  transition: background 0.3s;
}

.nav-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-display);
  font-size: 1.5rem;
  color: var(--ice);
  letter-spacing: 3px;
  cursor: pointer;
  user-select: none;
}
.nav-logo-mark {
  width: 28px; height: 28px;
  background: linear-gradient(135deg, var(--cobalt), var(--cyan));
  clip-path: polygon(50% 0%, 100% 25%, 100% 75%, 50% 100%, 0% 75%, 0% 25%);
  flex-shrink: 0;
}

.nav-links {
  display: flex;
  gap: 2.5rem;
  list-style: none;
}
.nav-links a {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--ice-dim);
  cursor: pointer;
  transition: color 0.2s;
  text-decoration: none;
  user-select: none;
}
.nav-links a:hover,
.nav-links a.active { color: var(--cyan); }

.nav-cta {
  background: transparent;
  border: 1px solid var(--gold);
  color: var(--gold);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 2px;
  text-transform: uppercase;
  padding: 8px 20px;
  cursor: pointer;
  transition: background 0.2s, color 0.2s;
}
.nav-cta:hover { background: var(--gold); color: var(--navy-dark); }

/* Hamburger */
.hamburger {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}
.hamburger span {
  display: block;
  width: 22px; height: 2px;
  background: var(--ice);
  transition: all 0.3s;
}

/* Mobile menu */
.mobile-menu {
  position: fixed;
  top: 64px; left: 0; right: 0;
  background: var(--navy-mid);
  border-bottom: 1px solid var(--border-dim);
  padding: 1rem 4vw;
  display: flex;
  flex-direction: column;
  gap: 0;
  z-index: 999;
  transform: translateY(-110%);
  transition: transform 0.3s cubic-bezier(0.4,0,0.2,1);
}
.mobile-menu.open { transform: translateY(0); }
.mobile-menu a {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--ice-dim);
  padding: 14px 0;
  border-bottom: 1px solid var(--border-dim);
  cursor: pointer;
  text-decoration: none;
  user-select: none;
  transition: color 0.2s;
}
.mobile-menu a:hover { color: var(--cyan); }
.mobile-menu a:last-child { border-bottom: none; }