/* ============================================
   SCROLL TO TOP BUTTON
   ============================================ */

.scroll-to-top {
    position: fixed;
    left: 2rem;
    bottom: 2rem;
    z-index: 999;
    
    /* Button styling - круглая форма */
    width: 56px;
    height: 56px;
    border-radius: 50%;
    
    /* Стиль как у .full-server-details-btn */
    background: transparent;
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--glass-border);
    
    /* Shadow */
    box-shadow: var(--shadow-lg);
    
    /* Flex centering */
    display: flex;
    align-items: center;
    justify-content: center;
    
    /* Cursor */
    cursor: pointer;
    
    /* Плавные transitions */
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px) scale(0.9);
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.scroll-to-top.visible {
    opacity: 1;
    visibility: visible;
    transform: translateY(0) scale(1);
}

/* Hover effect как у .full-server-details-btn */
.scroll-to-top:hover {
    background: rgba(226, 1, 205, 0.1);
    border-color: var(--primary);
    box-shadow: var(--shadow-xl), 0 0 20px rgba(226, 1, 205, 0.2);
    transform: translateY(-4px) scale(1.05);
}

/* Active state */
.scroll-to-top:active {
    transform: translateY(-2px) scale(0.98);
    transition: all 0.1s cubic-bezier(0.4, 0, 0.2, 1);
}

/* Icon styling */
.scroll-to-top svg {
    width: 24px;
    height: 24px;
    color: var(--muted-foreground);
    transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.scroll-to-top:hover svg {
    color: var(--primary);
    transform: translateY(-2px);
}

/* Pulse animation on first appearance */
@keyframes pulse-glow {
    0%, 100% {
        box-shadow: var(--shadow-lg);
    }
    50% {
        box-shadow: var(--shadow-xl), 0 0 30px rgba(226, 1, 205, 0.3);
    }
}

.scroll-to-top.first-show {
    animation: pulse-glow 2s ease-in-out 3;
}

/* Mobile adjustments */
@media (max-width: 768px) {
    .scroll-to-top {
        left: 1rem;
        bottom: 1rem;
        width: 48px;
        height: 48px;
    }
    
    .scroll-to-top svg {
        width: 20px;
        height: 20px;
    }
}

/* Tablet adjustments */
@media (max-width: 1024px) and (min-width: 769px) {
    .scroll-to-top {
        left: 1.5rem;
        bottom: 1.5rem;
    }
}

/* Accessibility - focus state */
.scroll-to-top:focus {
    outline: 2px solid var(--primary);
    outline-offset: 2px;
}

.scroll-to-top:focus:not(:focus-visible) {
    outline: none;
}

/* Dark theme adjustments (если понадобится) */
[data-theme="dark"] .scroll-to-top {
    background: transparent;
    border-color: var(--glass-border);
}

[data-theme="dark"] .scroll-to-top:hover {
    background: rgba(226, 1, 205, 0.1);
    border-color: var(--primary);
}

/* Gradient border effect on hover */
.scroll-to-top::before {
    content: '';
    position: absolute;
    inset: -2px;
    border-radius: 50%;
    padding: 2px;
    -webkit-mask: 
        linear-gradient(#fff 0 0) content-box, 
        linear-gradient(#fff 0 0);
    -webkit-mask-composite: xor;
    mask-composite: exclude;
    opacity: 0;
    transition: opacity 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

.scroll-to-top:hover::before {
    opacity: 1;
}