/* Header */
#main-header {
    background-color: rgba(255, 255, 255, 0.95);
    padding: 1rem 0;
    position: fixed;
    width: 100%;
    top: 0;
    left: 0;
    z-index: 1000; 
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
    transition: background-color 0.3s ease, padding 0.3s ease;
}

#main-header.scrolled {
    background-color: rgba(255, 255, 255, 1);
    padding: 0.75rem 0;
}

#main-header .container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo-link {
    display: flex;
    align-items: center;
    text-decoration: none;
    color: var(--primary-color);
}

.logo {
    height: 40px;
    margin-right: 10px;
    transition: transform 0.3s ease;
}

.logo-link:hover .logo {
    transform: scale(1.1);
}

.logo-text {
    font-family: var(--font-heading);
    font-size: 1.5rem;
    font-weight: 700;
}

/* Desktop Navigation */
#main-nav ul { 
    list-style: none;
    display: flex; 
}

#main-nav ul li {
    margin-left: 25px; 
}

#main-nav ul li a {
    text-decoration: none;
    color: var(--primary-color);
    font-weight: 500;
    padding: 5px 0;
    position: relative;
    transition: color 0.3s ease;
}

#main-nav ul li a::after {
    content: '';
    position: absolute;
    bottom: -2px;
    left: 0;
    width: 0;
    height: 2px;
    background-color: var(--secondary-color);
    transition: width 0.3s ease;
}

#main-nav ul li a:hover,
#main-nav ul li a.active {
    color: var(--secondary-color);
}

#main-nav ul li a:hover::after,
#main-nav ul li a.active::after {
    width: 100%;
}

/* Mobile Menu Toggle Button (Hamburger Icon) */
#mobile-menu-toggle {
    display: none; 
    background: none;
    border: none;
    cursor: pointer;
    padding: 0;
    z-index: 1005; 
    position: relative; 
}

#mobile-menu-toggle span {
    display: block;
    width: 25px;
    height: 3px;
    background-color: var(--primary-color);
    margin: 5px 0;
    border-radius: 3px;
    transition: transform 0.3s ease, opacity 0.3s ease, background-color 0.3s ease;
}

/* Mobile Menu Open State for Toggle Button*/
#mobile-menu-toggle.open span:nth-child(1) {
    transform: translateY(8px) rotate(45deg);
}

#mobile-menu-toggle.open span:nth-child(2) {
    opacity: 0;
}

#mobile-menu-toggle.open span:nth-child(3) {
    transform: translateY(-8px) rotate(-45deg);
}