/* ===========================
   NAVBAR — Alphex Engineers
   navbar.css
=========================== */

/* ── Header ── */
header {
  background-color: #f4f7fb;
  position: sticky;
  top: 0;
  z-index: 1000;
  border-bottom: 1px solid rgba(0, 0, 0, 0.06);
  transition:
    box-shadow 0.3s ease,
    background 0.3s ease;
}

header.scrolled {
  background-color: var(--white);
  box-shadow: 0 2px 20px rgba(0, 0, 0, 0.08);
}

header.scrolled nav ul li a {
  color: var(--dark1);
}

/* ── Header Container ── */
.header-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 10px 0;
}

/* ── Logo ── */
.logo {
  display: flex;
  align-items: center;
  flex-shrink: 0;
}

.logo-img {
  height: 60px;
  width: auto;
}

.logo h1 {
  color: var(--dark1);
  font-size: clamp(1rem, 2vw, 1.5rem);
  margin-left: 10px;
}

/* ── Desktop Nav ── */
nav ul {
  display: flex;
  align-items: center;
  gap: 4px;
  list-style: none;
}

nav ul li a {
  color: var(--dark1);
  font-weight: 600;
  font-size: clamp(0.85rem, 1.2vw, 1rem);
  padding: 6px 8px;
  position: relative;
  white-space: nowrap;
  transition: color 0.3s;
}

nav ul li a:hover {
  color: var(--primary);
}

nav ul li a::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 8px;
  width: 0;
  height: 2px;
  background-color: var(--primary);
  transition: width 0.3s;
}

nav ul li a:hover::after {
  width: calc(100% - 16px);
}

/* ── Dropdown ── */
.dropdown {
  position: relative;
}

.dropdown-toggle {
  display: flex;
  align-items: center;
  gap: 6px;
}

.dropdown-menu {
  position: absolute;
  top: calc(100% + 10px);
  left: 0;
  background: var(--white);
  min-width: 300px;
  padding: 8px 0;
  border-radius: 12px;
  box-shadow: 0 12px 30px rgba(0, 0, 0, 0.12);
  border: 1px solid rgba(0, 0, 0, 0.06);
  display: flex;
  flex-direction: column;
  opacity: 0;
  visibility: hidden;
  transform: translateY(8px);
  transition:
    opacity 0.25s ease,
    transform 0.25s ease,
    visibility 0.25s;
  z-index: 999;
}

.dropdown-menu li {
  margin: 0;
  width: 100%;
}

.dropdown-menu li a {
  display: block;
  padding: 9px 20px;
  font-weight: 500;
  font-size: 0.9rem;
  white-space: nowrap;
  transition:
    background 0.2s,
    color 0.2s;
}

.dropdown-menu li a::after {
  display: none;
}

.dropdown-menu li a:hover {
  background: #e8f3fc;
  color: var(--primary);
}

/* ── Mobile Menu Button ── */
.mobile-menu-btn {
  display: none;
  background: none;
  border: none;
  font-size: 1.6rem;
  color: var(--dark1);
  cursor: pointer;
  padding: 6px;
  border-radius: 8px;
  min-width: 44px;
  min-height: 44px;
  align-items: center;
  justify-content: center;
  transition: background 0.2s;
}

.mobile-menu-btn:hover {
  background: rgba(0, 0, 0, 0.06);
}

/* ── Desktop Hover ── */
@media (min-width: 769px) {
  .dropdown:hover .dropdown-menu {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
  }

  .dropdown:hover .fa-chevron-down {
    transform: rotate(180deg);
    transition: transform 0.3s ease;
  }
}

/* ── Mobile ── */
@media (max-width: 768px) {
  nav {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    width: 100%;
    background-color: var(--white);
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
    padding: 16px 20px 24px;
    border-top: 1px solid rgba(0, 0, 0, 0.06);
    max-height: calc(100vh - 80px);
    overflow-y: auto;
  }

  nav.active {
    display: block;
  }

  nav ul {
    flex-direction: column;
    align-items: flex-start;
    gap: 0;
  }

  nav ul li {
    width: 100%;
    border-bottom: 1px solid rgba(0, 0, 0, 0.05);
  }

  nav ul li:last-child {
    border-bottom: none;
  }

  nav ul li a {
    display: block;
    padding: 12px 4px;
    font-size: 1rem;
    width: 100%;
  }

  nav ul li a::after {
    display: none;
  }

  .mobile-menu-btn {
    display: flex;
  }

  .logo-img {
    height: 48px;
  }

  .dropdown-toggle {
    justify-content: space-between;
  }

  .dropdown-menu {
    position: static;
    box-shadow: none;
    border: none;
    border-radius: 0;
    background: #f0f7ff;
    padding: 0 0 0 16px;
    display: none;
    opacity: 1;
    visibility: visible;
    transform: none;
    transition: none;
    min-width: unset;
    width: 100%;
  }

  .dropdown.active .dropdown-menu {
    display: block;
  }

  .dropdown.active .fa-chevron-down {
    transform: rotate(180deg);
  }

  .dropdown-menu li a {
    padding: 10px 12px;
    font-size: 0.9rem;
    border-bottom: 1px solid rgba(0, 0, 0, 0.04);
  }

  .dropdown-menu li:last-child a {
    border-bottom: none;
  }
}

/* ── Small Mobile ── */
@media (max-width: 400px) {
  .logo-img {
    height: 40px;
  }

  .mobile-menu-btn {
    font-size: 1.4rem;
    min-width: 40px;
    min-height: 40px;
  }
}