/* Кнопка "Наверх" */

.up {
    position: fixed;
    right: 30px;
    bottom: 30px;
    width: 56px;
    height: 56px;
    background: linear-gradient(135deg, #2d6a4f 0%, #40916c 100%);
    border-radius: 50%;
    box-shadow: 0 8px 24px rgba(45, 106, 79, 0.3);
    cursor: pointer;
    transition: all 0.3s ease;
    z-index: 999;
    display: flex;
    align-items: center;
    justify-content: center;
    opacity: 0;
    visibility: hidden;
    transform: translateY(20px);
}

.up.show {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.up::before {
    content: '↑';
    color: white;
    font-size: 28px;
    font-weight: bold;
    line-height: 1;
}

.up:hover {
    transform: translateY(-5px);
    box-shadow: 0 12px 32px rgba(45, 106, 79, 0.4);
}

.up:active {
    transform: translateY(-2px) scale(0.95);
}

/* Пульсация */
@keyframes pulse-up {
    0%, 100% {
        box-shadow: 0 8px 24px rgba(45, 106, 79, 0.3);
    }
    50% {
        box-shadow: 0 8px 24px rgba(45, 106, 79, 0.5), 0 0 0 8px rgba(45, 106, 79, 0.1);
    }
}

.up.show {
    animation: pulse-up 2s infinite;
}

/* Адаптивность */
@media (max-width: 768px) {
    .up {
        right: 20px;
        bottom: 20px;
        width: 50px;
        height: 50px;
    }
    
    .up::before {
        font-size: 24px;
    }
}

@media (max-width: 600px) {
    .up {
        right: 15px;
        bottom: 80px;
        width: 48px;
        height: 48px;
    }
    
    .up::before {
        font-size: 22px;
    }
}