/* Premium Navigation Interactions */

#header nav ul {
    position: relative;
    /* Ensure indicator stays contained */
    z-index: 1;
}

/* Sliding active indicator (Glass pill) */
.nav-indicator {
    position: absolute;
    top: 0;
    left: 0;
    border-radius: 4px;
    background: rgba(255, 255, 255, 0.05);
    backdrop-filter: blur(8px);
    -webkit-backdrop-filter: blur(8px);
    box-shadow: inset 0 1px 1px rgba(255, 255, 255, 0.1);
    pointer-events: none;
    opacity: 0;
    transition: transform 0.4s cubic-bezier(0.2, 0.8, 0.2, 1), width 0.4s cubic-bezier(0.2, 0.8, 0.2, 1), height 0.4s cubic-bezier(0.2, 0.8, 0.2, 1), opacity 0.3s ease;
    z-index: -1;
}

#header nav ul:hover .nav-indicator,
#header nav ul:focus-within .nav-indicator {
    opacity: 1;
}

/* Base styles for links */
#header nav ul li a {
    position: relative;
    overflow: hidden; /* For ripple effect */
    transition: transform 0.3s cubic-bezier(0.2, 0.8, 0.2, 1), color 0.3s ease !important;
    z-index: 2;
    background-color: transparent !important; /* override default hover bg */
}

/* Micro scale animation */
#header nav ul li a:hover {
    transform: scale(1.05) translateY(-2px);
    text-shadow: 0 0 10px rgba(255, 255, 255, 0.3);
}

#header nav ul li a:active {
    transform: scale(0.95);
}

/* Keyboard focus animation */
#header nav ul li a:focus-visible {
    outline: none;
    box-shadow: 0 0 0 2px rgba(255, 255, 255, 0.8);
    border-radius: 4px;
}

/* Animated underline inside links */
#header nav ul li a::before {
    content: '';
    position: absolute;
    bottom: 0.4rem;
    left: 20%;
    width: 60%;
    height: 1px;
    background: rgba(255, 255, 255, 0.6);
    transform: scaleX(0);
    transform-origin: right;
    transition: transform 0.4s cubic-bezier(0.2, 0.8, 0.2, 1);
}

#header nav ul li a:hover::before {
    transform: scaleX(1);
    transform-origin: left;
}

/* Ripple click animation */
.nav-ripple {
    position: absolute;
    border-radius: 50%;
    transform: scale(0);
    animation: navRipple 0.6s cubic-bezier(0.2, 0.8, 0.2, 1);
    background: rgba(255, 255, 255, 0.3);
    pointer-events: none;
}

@keyframes navRipple {
    to {
        transform: scale(4);
        opacity: 0;
    }
}

/* Page transition indicator (Simple & Casual) */
.page-transition-bar {
    position: fixed;
    top: 0;
    left: 50%;
    transform: translateX(-50%);
    height: 1.5px;
    background: rgba(255, 255, 255, 0.6);
    width: 0%;
    z-index: 10000;
    pointer-events: none;
    opacity: 0;
    transition: width 0.3s ease-out, opacity 0.3s ease;
}

.page-transition-bar.loading {
    opacity: 1;
    width: 30%;
    transition: width 1s cubic-bezier(0.2, 0.8, 0.2, 1);
}

.page-transition-bar.complete {
    opacity: 1;
    width: 100%;
    transition: width 0.3s ease-out;
}