(function () {
    'use strict';

    function initSnow() {
        const oldContainers = document.querySelectorAll('#snowfall-container, #tilda-snow, .t-snow');
        oldContainers.forEach(el => {
            if (el.parentNode) el.parentNode.removeChild(el);
        });

        const currentPath = window.location.pathname;
        if (currentPath.includes('/learn/')) {
            return;
        }

        if (document.getElementById('snowfall-container')) {
            return;
        }

        const container = document.createElement('div');
        container.id = 'snowfall-container';
        Object.assign(container.style, {
            position: 'fixed',
            top: '0',
            left: '0',
            width: '100%',
            height: '100%',
            pointerEvents: 'none',
            zIndex: '9999',
            overflow: 'hidden'
        });
        document.body.appendChild(container);

        if (!document.getElementById('snowfall-styles')) {
            const style = document.createElement('style');
            style.id = 'snowfall-styles';
            style.textContent = `
                @keyframes fallSnow {
                    0% {
                        transform: translateY(-20px) translateX(0);
                        opacity: var(--opacity, 0.8);
                    }
                    100% {
                        transform: translateY(${window.innerHeight + 100}px) translateX(var(--end-x, 0));
                        opacity: 0;
                    }
                }
            `;
            document.head.appendChild(style);
        }

        const snowflakeCount = 60;
        for (let i = 0; i < snowflakeCount; i++) {
            setTimeout(() => {
                const size = Math.random() * 16 + 8; // 8–24px
                const opacity = Math.random() * 0.3 + 0.7; // ЯРЧЕ: почти непрозрачные
                const strokeWidth = Math.random() * 1 + 0.6; // ЯРЧЕ: толще линии
                const startX = Math.random() * window.innerWidth;
                const duration = Math.random() * 8 + 12;
                const delay = Math.random() * 5;
                const endX = (Math.random() - 0.5) * 180;

                const svg = document.createElementNS('http://www.w3.org/2000/svg', 'svg');
                svg.setAttribute('width', size);
                svg.setAttribute('height', size);
                svg.setAttribute('viewBox', '0 0 24 24');
                Object.assign(svg.style, {
                    position: 'absolute',
                    top: '0',
                    left: startX + 'px',
                    opacity: opacity,
                    display: 'block',
                    animation: `fallSnow ${duration}s linear ${delay}s infinite`,
                    userSelect: 'none',
                    filter: 'drop-shadow(0 0 2px rgba(255, 255, 255, 0.9))' // 🔆 СВЕЧЕНИЕ!
                });
                svg.style.setProperty('--end-x', endX + 'px');
                svg.style.setProperty('--opacity', opacity);

                svg.innerHTML = `
                    <g stroke="white" stroke-width="${strokeWidth}" stroke-linecap="round" fill="none">
                        <line x1="2" y1="12" x2="22" y2="12"/>
                        <line x1="6" y1="6" x2="18" y2="18"/>
                        <line x1="6" y1="18" x2="18" y2="6"/>
                    </g>
                `;

                container.appendChild(svg);
            }, i * 80);
        }
    }

    if (document.readyState === 'loading') {
        document.addEventListener('DOMContentLoaded', initSnow);
    } else {
        initSnow();
    }

    let lastPath = window.location.pathname;
    setInterval(() => {
        const currentPath = window.location.pathname;
        if (currentPath === lastPath) return;
        lastPath = currentPath;

        const container = document.getElementById('snowfall-container');
        if (currentPath.includes('/learn/')) {
            if (container) container.remove();
        } else {
            if (!container) initSnow();
        }
    }, 1500);
})();