/**
 * 🎯 Bangalirhaat Auto-Scroll CSS Enhancements
 * ────────────────────────────────────────────────────────
 */

/* ────────────────────────────────────────────────────────
   Scroll Behavior (auto — smooth page-scroll বন্ধ, যাতে কোনো
   programmatic scroll animated glide হয়ে নিচে টেনে না নেয়;
   carousel-এর নিজস্ব smooth behavior আলাদা, অক্ষত থাকবে)
   ──────────────────────────────────────────────────────── */
html {
    scroll-behavior: auto;
}

/* Fix: Prevent body overflow from affecting smooth scroll */
body {
    overflow-x: hidden;
}

/* ────────────────────────────────────────────────────────
   Auto-Scroll Carousel Styling
   ──────────────────────────────────────────────────────── */
[data-autoscroll="true"] {
    scroll-snap-type: x mandatory;
    overflow-x: auto;
    overflow-y: hidden;
    -webkit-overflow-scrolling: touch;
    scrollbar-width: none; /* Firefox */
}

[data-autoscroll="true"]::-webkit-scrollbar {
    display: none; /* Chrome, Safari, Edge */
}

[data-autoscroll="true"] > * {
    scroll-snap-align: start;
    flex-shrink: 0;
}

/* ────────────────────────────────────────────────────────
   Scroll-Reveal Animations
   ──────────────────────────────────────────────────────── */
[data-scroll-reveal="true"] {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s cubic-bezier(0.4, 0, 0.2, 1),
                transform 0.6s cubic-bezier(0.4, 0, 0.2, 1);
}

[data-scroll-reveal="true"].scroll-reveal {
    opacity: 1;
    transform: translateY(0);
}

/* Staggered animation for multiple scroll-reveal elements */
[data-scroll-reveal="true"]:nth-child(1) { transition-delay: 0s; }
[data-scroll-reveal="true"]:nth-child(2) { transition-delay: 0.1s; }
[data-scroll-reveal="true"]:nth-child(3) { transition-delay: 0.2s; }
[data-scroll-reveal="true"]:nth-child(4) { transition-delay: 0.3s; }
[data-scroll-reveal="true"]:nth-child(n+5) { transition-delay: 0.4s; }

/* ────────────────────────────────────────────────────────
   Back-to-Top Button Enhancements
   ──────────────────────────────────────────────────────── */
#back-to-top {
    display: none;
    position: fixed;
    bottom: 24px;
    right: 24px;
    width: 44px;
    height: 44px;
    background: var(--primary, #8e1e3f);
    color: white;
    border: none;
    border-radius: 12px;
    cursor: pointer;
    z-index: 98;
    opacity: 0;
    transform: translateY(10px) scale(0.9);
    transition: all 0.3s cubic-bezier(0.23, 1, 0.320, 1);
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
}

#back-to-top[style*="display: block"] {
    opacity: 1;
    transform: translateY(0) scale(1);
}

#back-to-top:hover {
    background: var(--primary-dark, #6e1830);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.25);
    transform: translateY(-2px) scale(1.05);
}

#back-to-top:active {
    transform: translateY(2px) scale(0.95);
}

/* Mobile: smaller button on small screens */
@media (max-width: 640px) {
    #back-to-top {
        bottom: 100px;
        right: 12px;
        width: 40px;
        height: 40px;
        font-size: 18px;
    }
}

/* ────────────────────────────────────────────────────────
   Scroll Progress Bar Enhancements
   ──────────────────────────────────────────────────────── */
.scroll-progress {
    position: fixed;
    top: 0;
    left: 0;
    height: 3px;
    background: linear-gradient(90deg, 
        var(--primary, #8e1e3f) 0%,
        var(--accent, #c6a35a) 100%);
    width: 0%;
    z-index: 1000;
    transition: width 0.1s ease-out;
    box-shadow: 0 0 8px rgba(198, 163, 90, 0.4);
}

/* ────────────────────────────────────────────────────────
   Carousel Controls
   ──────────────────────────────────────────────────────── */
.carousel-controls {
    display: flex;
    gap: 8px;
    align-items: center;
    justify-content: center;
    margin-top: 12px;
    opacity: 0.7;
    transition: opacity 0.2s ease-out;
}

.carousel-container:hover .carousel-controls {
    opacity: 1;
}

.carousel-btn {
    width: 36px;
    height: 36px;
    border-radius: 8px;
    border: 1px solid var(--border, #e0e0e0);
    background: var(--bg-secondary, white);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all 0.2s ease-out;
    color: var(--text, #333);
}

.carousel-btn:hover {
    border-color: var(--primary, #8e1e3f);
    background: var(--primary, #8e1e3f);
    color: white;
    transform: scale(1.05);
}

.carousel-btn:active {
    transform: scale(0.95);
}

/* ────────────────────────────────────────────────────────
   Smooth Page Transitions
   ──────────────────────────────────────────────────────── */
::selection {
    background: var(--primary-light, rgba(142, 30, 63, 0.2));
    color: var(--text, inherit);
}

::-moz-selection {
    background: var(--primary-light, rgba(142, 30, 63, 0.2));
    color: var(--text, inherit);
}

/* ────────────────────────────────────────────────────────
   Fix: Scroll Anchor & Layout Stability
   ──────────────────────────────────────────────────────── */
html {
    overflow-anchor: auto; /* Enable scroll compensation */
}

/* Prevent layout shift from unsized images */
img {
    display: block;
    max-width: 100%;
    height: auto;
}

/* Ensure lazy-load images don't cause layout shift */
img[loading="lazy"],
img[data-lazy] {
    background: var(--bg-secondary, #f5f5f5);
    min-height: 120px;
}

/* ────────────────────────────────────────────────────────
   Dark Mode Support
   ──────────────────────────────────────────────────────── */
[data-theme="dark"] #back-to-top {
    background: var(--primary-dark, #c6a35a);
    box-shadow: 0 4px 12px rgba(198, 163, 90, 0.3);
}

[data-theme="dark"] #back-to-top:hover {
    background: var(--accent, #e8c674);
    box-shadow: 0 8px 20px rgba(198, 163, 90, 0.4);
}

[data-theme="dark"] .carousel-btn {
    border-color: var(--border-dark, #444);
    background: var(--bg-secondary-dark, #222);
}

[data-theme="dark"] .carousel-btn:hover {
    border-color: var(--primary, #c6a35a);
    background: var(--primary, #c6a35a);
    color: black;
}

/* ────────────────────────────────────────────────────────
   Accessibility: Reduced Motion Support
   ──────────────────────────────────────────────────────── */
@media (prefers-reduced-motion: reduce) {
    html {
        scroll-behavior: auto;
    }

    [data-scroll-reveal="true"],
    #back-to-top,
    [data-autoscroll="true"],
    .carousel-btn {
        transition: none !important;
    }

    [data-scroll-reveal="true"] {
        opacity: 1;
        transform: none;
    }
}

/* ────────────────────────────────────────────────────────
   Performance: Will-change optimization
   ──────────────────────────────────────────────────────── */
[data-autoscroll="true"] {
    will-change: scroll-position;
}

[data-autoscroll="true"]:not(:hover):not(:focus-visible) {
    will-change: auto;
}

/* ────────────────────────────────────────────────────────
   Print Styles
   ──────────────────────────────────────────────────────── */
@media print {
    #back-to-top,
    .carousel-controls,
    [data-autoscroll="true"] {
        display: none !important;
    }

    html {
        scroll-behavior: auto;
    }
}