/************** Navigation Bar — Glass **************/

/* Design of the navigation bar */
.navbar {
  position: fixed;
  top: 0%;
  left: 0%;
  width: 100%;
  padding: var(--nav-pad-y) var(--nav-pad-x);
  display: flex;
  justify-content: space-between;
  align-items: center;
  z-index: 100;

  /* sizing */
  --nav-pad-y: 0.4rem;
  --nav-pad-x: 5%;

  /* glass controls (tweak to taste) */
  --glass-r: 225;
  --glass-g: 225;
  --glass-b: 225;
  --glass-a: 0.91;
  --glass-blur: 7px;
  --glass-sat: 140%;

  /* glass background */
  background: rgba(
    var(--glass-r),
    var(--glass-g),
    var(--glass-b),
    var(--glass-a)
  );
  backdrop-filter: blur(var(--glass-blur)) saturate(var(--glass-sat));
  -webkit-backdrop-filter: blur(var(--glass-blur)) saturate(var(--glass-sat));
  transition: 0.5s ease-out;
}

/* Navbar after the webpage is scrolled */
.navbar.sticky {
  background: rgba(var(--glass-r), var(--glass-g), var(--glass-b), 0.22);
  backdrop-filter: blur(var(--glass-blur)) saturate(var(--glass-sat));
  -webkit-backdrop-filter: blur(var(--glass-blur)) saturate(var(--glass-sat));
  box-shadow: 0 8px 22px rgba(0, 0, 0, 0.08);
}

/* ---------- Logo (image) ---------- */
.logo {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  text-decoration: none;
  color: rgb(var(--gray-100));
  position: relative;
  transition: 0.3s ease;
}

.logo::after {
  content: none;
}

.logo_img {
  width: 115px;
  height: 115px;
  display: block;
  object-fit: contain;
  border-radius: 10px; /* set to 0 if your icon is square */
  transition: transform 0.25s ease, filter 0.25s ease;
  image-rendering: auto;
}

.logo:hover .logo_img,
.logo:focus .logo_img {
  transform: translateY(-1px) scale(1.04);
  filter: drop-shadow(0 2px 8px rgba(0, 0, 0, 0.25));
}

.navbar.sticky .logo_img {
  filter: brightness(1.05);
}

.logo span {
  color: rgb(var(--blue-400));
  font-weight: 600;
  transition: 0.5s ease;
}

/* flex container for links on the left */
.navlinks {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
}

/* list items */
.navlinks ul li {
  display: inline-block;
  list-style: none;
  margin: 10px 20px;
}

/* anchor links — default dark grey, hover/active black */
.navlinks ul li a {
  text-decoration: none;
  color: rgb(var(--gray-800)); /* Dark Grey default */
  text-transform: uppercase;
  letter-spacing: 0.14em;
  font-weight: 400;
  font-size: var(--font-size-s);
  line-height: 1;
  position: relative;
  transition: color 0.2s ease;
}

.navlinks ul li a:hover,
.navlinks ul li a:focus,
.navlinks ul li a.active {
  color: rgb(var(--gray-900)); /* Black on hover/active */
}

.navlinks ul li a::after {
  content: "";
  width: 0;
  height: 3px;
  background: rgb(var(--gray-900)); /* Black underline */
  position: absolute;
  left: 0;
  bottom: -6px;
  transition: 0.4s ease-out;
}

.navlinks ul li a:hover::after,
.navlinks ul li a:focus::after,
.navlinks ul li a.active::after {
  width: 100%;
}

/* Menu icon for responsiveness */
#menu-bar {
  position: relative;
  cursor: pointer;
  display: none;
  color: rgb(var(--gray-100));
  font-size: var(--font-size-3xl);
}

/************** Responsiveness **************/
@media (max-width: 900px) {
  .navbar {
    padding: 1.2rem 5%;
  }

  #menu-bar {
    display: block;
  }

  .navlinks {
    text-align: center;
    position: absolute;
    top: 100%;
    left: -100%;
    width: 100%;
    padding: 2rem 4%;
    z-index: 1;
    transition: 0.4s ease-out;
    flex-direction: column;
    background: rgba(var(--gray-700), 0.8);
  }

  .navlinks ul {
    display: flex;
    flex-direction: column;
  }

  .navlinks.active {
    left: 0;
  }

  .navlinks a {
    display: block;
    margin: 1rem 0;
  }

  .logo_img {
    width: 45px;
    height: 45px;
    border-radius: 8px;
  }
}

@media (max-width: 500px) {
  .navbar {
    padding: 1.2rem 7%;
  }

  .logo_img {
    width: 40px;
    height: 40px;
    border-radius: 8px;
  }
}

/* Optional entrance motion for .moveDown */
@media (prefers-reduced-motion: no-preference) {
  .moveDown {
    animation: moveDown 500ms ease-out both;
  }
  @keyframes moveDown {
    from {
      transform: translateY(-12px);
      opacity: 0;
    }
    to {
      transform: translateY(0);
      opacity: 1;
    }
  }
}