/* ========================================
   SMOOTH SCROLL BEHAVIOR
   Item 54/78: Enhanced navigation experience
   ======================================== */

/* ====================================
   SMOOTH SCROLLING
   ==================================== */

/* Enable smooth scrolling for all anchor links */
html {
    scroll-behavior: smooth;
}

/* Disable smooth scroll for users who prefer reduced motion */
@media (prefers-reduced-motion: reduce) {
    html {
        scroll-behavior: auto;
    }
}

/* ====================================
   SCROLL PADDING (for fixed headers)
   ==================================== */

/* Add scroll padding to prevent content from hiding under fixed header */
html {
    scroll-padding-top: 110px; /* Match body padding-top */
}

/* Adjust for mobile */
@media (max-width: 768px) {
    html {
        scroll-padding-top: 140px; /* Match body padding-top on mobile */
    }
}

/* ====================================
   SCROLL SNAP (optional for sections)
   ==================================== */

/* Optional: Enable scroll snapping for sections
.scroll-snap-container {
    scroll-snap-type: y mandatory;
}

.scroll-snap-section {
    scroll-snap-align: start;
    scroll-snap-stop: always;
}
*/

/* ====================================
   ENHANCED SCROLL INDICATORS
   ==================================== */

/* Smooth fade for scroll progress bar */
.scroll-progress {
    transition: width 0.1s ease-out;
}

/* ====================================
   ANCHOR OFFSET (for skip links)
   ==================================== */

/* Add offset to prevent content hiding under fixed elements */
:target {
    scroll-margin-top: 110px; /* Match body padding-top */
}

@media (max-width: 768px) {
    :target {
        scroll-margin-top: 140px; /* Match body padding-top on mobile */
    }
}

/* ====================================
   SMOOTH SCROLLBAR (webkit only)
   ==================================== */

/* Custom scrollbar with smooth appearance */
::-webkit-scrollbar {
    width: 12px;
}

::-webkit-scrollbar-track {
    background: rgba(0, 0, 0, 0.1);
}

::-webkit-scrollbar-thumb {
    background: rgba(255, 255, 255, 0.2);
    border-radius: 6px;
    transition: background 0.3s ease;
}

::-webkit-scrollbar-thumb:hover {
    background: rgba(255, 255, 255, 0.3);
}

/* ====================================
   BACK TO TOP BUTTON (if implemented)
   ==================================== */

.back-to-top {
    position: fixed;
    bottom: 30px;
    right: 30px;
    width: 50px;
    height: 50px;
    background: var(--primary-color, #1565C0);
    color: white;
    border: none;
    border-radius: 50%;
    font-size: 24px;
    cursor: pointer;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s ease, visibility 0.3s ease, transform 0.3s ease;
    z-index: 1000;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.3);
}

.back-to-top.visible {
    opacity: 1;
    visibility: visible;
}

.back-to-top:hover {
    transform: translateY(-5px);
    box-shadow: 0 6px 16px rgba(0, 0, 0, 0.4);
}

.back-to-top:active {
    transform: translateY(-2px);
}

@media (max-width: 768px) {
    .back-to-top {
        width: 45px;
        height: 45px;
        bottom: 20px;
        right: 20px;
    }
}

/* ====================================
   PERFORMANCE OPTIMIZATION
   ==================================== */

/* Use CSS containment for better scroll performance */
section {
    contain: layout style paint;
}

/* Optimize repaints during scrolling */
.fixed-element {
    will-change: transform;
}