/* ============================================================
   VOLUM TECHNOLOGIES — Navigation & Dropdown
   ============================================================ */

#navbar {
  position: fixed; top: 0; left: 0; right: 0; z-index: 1000;
  height: 68px;
  display: flex; align-items: center; justify-content: space-between;
  padding: 0 clamp(1.5rem, 5vw, 4rem);
  background: rgba(2, 4, 7, 0.75);
  backdrop-filter: blur(24px);
  border-bottom: 1px solid rgba(0,152,253,0.08);
  transition: border-color 0.3s, background 0.3s;
}
#navbar.scrolled {
  background: rgba(2, 4, 7, 0.96);
  border-bottom-color: rgba(0,152,253,0.2);
}

.nav-logo {
  display: flex; align-items: center;
  text-decoration: none;
}
.nav-logo img {
  height: 40px; width: auto;
  transition: opacity 0.2s;
}
.nav-logo:hover img { opacity: 0.85; }

.nav-center {
  display: flex; align-items: center; gap: 2.5rem;
  list-style: none;
}
.nav-center a {
  color: rgba(255,255,255,0.6); text-decoration: none;
  font-size: 0.85rem; font-weight: 400; letter-spacing: 0.04em;
  transition: color 0.2s;
  position: relative;
}
.nav-center a::after {
  content: ''; position: absolute; bottom: -4px; left: 0;
  width: 0; height: 1px; background: var(--primary);
  transition: width 0.3s;
}
.nav-center a:hover { color: var(--white); }
.nav-center a:hover::after { width: 100%; }

/* ── DROPDOWN ── */
.nav-item { position: relative; }

.nav-item > a {
  display: flex; align-items: center; gap: 0.35rem;
}
.nav-item > a .chevron {
  width: 10px; height: 10px;
  stroke: currentColor; fill: none; stroke-width: 2.5;
  stroke-linecap: round; stroke-linejoin: round;
  transition: transform 0.25s ease;
  flex-shrink: 0;
}
.nav-item:hover > a .chevron {
  transform: rotate(180deg);
}

.dropdown {
  position: absolute; top: 100%; left: 50%;
  transform: translateX(-50%) translateY(-4px);
  /* padding-top bridges the gap so hover isn't broken */
  padding-top: 14px;
  min-width: 180px;
  opacity: 0; visibility: hidden;
  transition: opacity 0.22s ease, transform 0.22s ease, visibility 0.22s;
  pointer-events: none;
}
/* visible card inside the padding wrapper */
.dropdown-inner {
  background: rgba(4, 8, 16, 0.97);
  border: 1px solid rgba(0,152,253,0.15);
  border-radius: 6px;
  padding: 0.5rem;
  backdrop-filter: blur(20px);
  box-shadow: 0 16px 40px rgba(0,0,0,0.5), 0 0 0 1px rgba(0,152,253,0.08);
  position: relative;
}
/* small arrow pointing up */
.dropdown-inner::before {
  content: '';
  position: absolute; top: -5px; left: 50%;
  transform: translateX(-50%) rotate(45deg);
  width: 8px; height: 8px;
  background: rgba(4, 8, 16, 0.97);
  border-left: 1px solid rgba(0,152,253,0.15);
  border-top: 1px solid rgba(0,152,253,0.15);
}

.nav-item:hover .dropdown {
  opacity: 1; visibility: visible;
  pointer-events: auto;
  transform: translateX(-50%) translateY(0);
}

.dropdown-inner a {
  display: flex; align-items: center; gap: 0.6rem;
  padding: 0.6rem 0.85rem;
  border-radius: 4px;
  position: relative;
  color: rgba(255,255,255,0.6) !important;
  font-size: 0.82rem !important;
  font-weight: 400;
  letter-spacing: 0.02em;
  text-decoration: none;
  transition: background 0.18s, color 0.18s;
  white-space: nowrap;
}
.dropdown-inner a::after { display: none !important; }
.dropdown-inner a:hover {
  background: rgba(0,152,253,0.1);
  color: var(--white) !important;
}
.dropdown-inner a.active {
  background: rgba(0,152,253,0.12);
  color: var(--white) !important;
}
.dropdown-inner a.active .drop-icon { opacity: 1; }
.dropdown-inner a.active::before {
  content: '';
  position: absolute; left: 0; top: 20%; bottom: 20%;
  width: 2px; border-radius: 2px;
  background: var(--primary);
  box-shadow: 0 0 6px rgba(0,152,253,0.8);
}

.dropdown-inner a .drop-icon {
  width: 20px; height: 20px;
  stroke: var(--primary); fill: none;
  stroke-width: 1.5; stroke-linecap: round; stroke-linejoin: round;
  flex-shrink: 0; opacity: 0.7;
}

/* ── NAV RIGHT: social icons + CTA + hamburger ── */
.nav-right { display: flex; align-items: center; gap: 1rem; }

.nav-social-link {
  color: rgba(255,255,255,0.4); display: flex;
  transition: color 0.2s;
}
.nav-social-link:hover { color: var(--primary); }

.nav-btn {
  background: transparent;
  border: 1px solid rgba(0,152,253,0.35);
  color: var(--primary);
  padding: 0.5rem 1.2rem;
  border-radius: 3px;
  font-family: var(--font); font-size: 0.82rem; font-weight: 500;
  letter-spacing: 0.06em; cursor: pointer;
  transition: all 0.3s; text-decoration: none; display: inline-block;
}
.nav-btn:hover {
  background: var(--primary); color: #000;
  box-shadow: 0 0 22px rgba(0,152,253,0.4);
}

.hamburger {
  display: none; flex-direction: column; gap: 5px;
  cursor: pointer; padding: 4px;
}
.hamburger span {
  width: 22px; height: 1.5px; background: var(--white);
  transition: all 0.3s;
}