/* ========== Header Base ========== */
.nav-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 20px 40px;
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  background-color: transparent;
  transition: background-color 0.4s ease, padding 0.4s ease;
  z-index: 9999;
}

/* Header on Scroll */
.nav-header.scrolled {
  background-color: #222222;
  padding: 12px 40px;
}

/* ========== Logo ========== */
.logo-and-contact {
  display: flex;
  align-items: center;
}

.company-logo {
  height: 50px;
  width: auto;
  display: block;
  transition: transform 0.3s ease, filter 0.3s ease;
  cursor: pointer;
}

.company-logo:hover {
  transform: scale(1.20);
  filter: brightness(1.1);
}

/* Logo Glow Effect */
.company-logo.glow {
  box-shadow: 0 0 8px 3px rgba(82, 152, 182, 0.8);
}

/* ========== Navigation ========== */
nav {
  transition: transform 0.4s ease;
}

.nav-links {
  list-style: none;
  display: flex;
  gap: 80px;
  margin: 0;
  padding: 0;
}

/* Navigation Links */
.nav-links li a {
  position: relative;
  text-decoration: none;
  color: #7189d8; /* blue default */
  font-weight: 600;
  font-size: 1.2rem;
  transition: color 0.3s ease;
}

.nav-links li a::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: -4px;
  width: 0;
  height: 2px;
  background-color: #7189d8; /* blue underline */
  transition: width 0.3s ease;
}

.nav-links li a:hover::after {
  width: 100%;
}

/* ========== Hamburger Toggle ========== */
.nav-toggle {
  display: none;
  background: none;
  border: none;
  font-size: 2rem;
  color: #7189d8; /* blue default */
  cursor: pointer;
  margin-left: 20px;
}

/* ========== Responsive ========== */
@media (max-width: 768px) {
  .nav-header {
    padding: 16px 24px;
  }

  .nav-links {
    display: none;
    flex-direction: column;
    gap: 20px;
    background-color: rgba(0, 0, 0, 0.95);
    position: absolute;
    top: 70px;
    right: 24px;
    padding: 20px;
    border-radius: 8px;
    z-index: 9998;
  }

  .nav-links.active {
    display: flex;
  }

  .nav-toggle {
    display: block;
  }
}

.nav-header.at-top .nav-toggle {
  display: none;
}

/* For Ipad Air */
@media (max-width: 820px) {
  .nav-toggle {
    display: block;
  }

  .nav-links {
    display: none;
  }

  .nav-links.active {
    display: flex;
    flex-direction: column;
    gap: 20px;
    background-color: rgba(0, 0, 0, 0.95);
    position: absolute;
    top: 70px;
    right: 24px;
    padding: 20px;
    border-radius: 8px;
    z-index: 9998;
  }
}

@media (max-width: 1368px) {
  /* For 912x1368 */
  .nav-toggle {
    display: block;
  }

  .nav-links {
    display: none;
  }

  .nav-links.active {
    display: flex;
    flex-direction: column;
    gap: 20px;
    background-color: rgba(0, 0, 0, 0.95);
    position: absolute;
    top: 70px;
    right: 24px;
    padding: 20px;
    border-radius: 8px;
    z-index: 9998;
  }
}

/* After scroll - white links and toggle */
.nav-header.scrolled {
  background-color: #222222;
  padding: 12px 40px;
}

.nav-header.scrolled .nav-links li a {
  color: #fdfdfd; /* white */
}

.nav-header.scrolled .nav-links li a::after {
  background-color: #7189d8; /* white underline */
}

.nav-header.scrolled .nav-toggle {
  color: #fdfdfd; /* white hamburger icon */
}

/* Hover behavior */

/* Hover BEFORE scroll: black */
.nav-header:not(.scrolled) .nav-links li a:hover,
.nav-header:not(.scrolled) .nav-toggle:hover {
  color: black !important;
}

/* Hover AFTER scroll: blue */
.nav-header.scrolled .nav-links li a:hover,
.nav-header.scrolled .nav-toggle:hover {
  color: #fdfdfd !important; /* blue */
}