/* ================== HEADER BASE ================== */
header {
  background-color: #2E4975;
  color: white;
  height: 15%;          /* fixed proportion */
  display: flex;
  flex-direction: column;
  justify-content: center;
  margin: 0;            /* reset */
  padding: 0;           /* reset */
}

#logo {
  width: 100px;
  height: 100px;
  border-radius: 100%;
  margin: 1%;
}

#start {
  display: flex;
  align-items: center;
  justify-content: center;  /* keep logo + title aligned */
}

#title {
  font-size: 2.5rem;
  font-weight: bold;
  margin: 0;            /* 🔥 avoid extra space */
  line-height: 1.2;     /* 🔥 compact line height */
}

/* ================== NAVIGATION ================== */
nav {
  display: block;
  unicode-bidi: isolate;
  margin-left: 8%;
  padding: 0;           /* 🔥 ensure no extra space */
  margin-top: 10px;
}

nav ul {
  --gap: 2rem;
  list-style: none;
  display: flex;
  gap: var(--gap);
  justify-content: space-evenly;
  align-items: center;
  margin: 0;            /* 🔥 reset browser default */
  padding: 0;           /* 🔥 reset browser default */
}

nav li {
  position: relative;
  padding: 0 1rem;
}

/* separator lines between menu items */
nav > ul > li:not(:first-child)::before {
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  right: 100%;
  margin-right: calc(var(--gap) / 2);
  width: 1px;
  background-color: white;
}

nav a {
  text-decoration: none;
  color: white;
  font-weight: 500;
  transition: color 0.3s ease;
}

nav > ul > li:hover > a {
  color: #ffb74d; /* hover = yellow */
}

/* Active page link */
.active {
  color: red;
}

/* ================== SUBMENU ================== */
nav ul .submenu {
  display: none;
  position: absolute;
  top: 100%;
  left: 0;
  background: #e0e0e0;
  padding: 0;
  margin: 0;
  list-style: none;
  min-width: 180px;
  z-index: 1000;
}

nav ul .submenu li {
  position: relative;
  transition: background-color 0.3s ease;
}

nav ul .submenu li::after {
  content: "";
  position: absolute;
  bottom: 0;               
  left: 50%;               
  transform: translateX(-50%);
  width: 85%;
  height: 1px;             
  background-color: #000;  
}

nav ul .submenu li:last-child::after {
  content: none;
}

nav ul .submenu a {
  color: #000;
  font-weight: 500;
  padding: 0.75rem 1rem;
  display: block;
  transition: color 0.2s ease;
}

nav ul .submenu li:hover {
  background-color: #cacaca;
}

nav ul .submenu a:hover {
  color: #2E4975;
}

nav li:hover > .submenu,
nav li:has(.submenu:hover) > .submenu {
  display: block;
}

/* ================== EXTRAS ================== */
.highlight {
  background-color: yellow;
  font-weight: bold;
}

#searchBox {
  display: none;
  margin-left: 10px;
}

.sub {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.sub img {
  flex-shrink: 0;
}

#btn {
  display: flex;
  justify-content: center;
  align-items: center;
  width: 50px;
  height: 50px;
  background: transparent;
  padding: 0;
  border: none;
}

#btn img {
  max-width: 70%;
  max-height: 70%;
}
/* ================== NAV RESPONSIVE ================== */

@media (max-width: 480px) {
  header #start {
    flex-direction: column !important;
    align-items: center;
  }
}

/* Phones (≤480px) */
@media (max-width: 480px) {
  nav ul {
    flex-direction: column;
    align-items: flex-start;   /* left align */
    justify-content: flex-start;
    gap: 1rem;
    padding-left: 2px;        /* margin from edge */
  }

  nav a {
    text-align: left;
    width: 100%;               /* full clickable row */
  }
}

/* Tablets (481px–768px) */
@media (max-width: 768px) {
  nav ul {
    flex-direction: column;
    align-items: flex-start;
    justify-content: flex-start;
    gap: 1rem;
    padding-left: 4px;        /* more padding for bigger screens */
  }

  nav a {
    text-align: left;
    width: 100%;
  }
}

/* Laptops (769px–1024px) */
@media (max-width: 1024px) {
  nav ul {
    gap: 1rem;                 /* tighter spacing */
    justify-content: flex-start;
    padding-left: 8px;
  }
}

/* Large screens (≥1200px) */
@media (min-width: 1200px) {
  nav ul {
    gap: 2rem;                 /* normal spacing */
    justify-content: space-evenly;
    padding-left: 16px;
  }
}