FlatlyPage

<?php
// ============================================================================
// Renderion Engine v3
// ============================================================================

if (!defined('BASE_DIR')) {
    die('Direct access not permitted');
}

final class RenderCache {
    private static $cache = [];
    private static $hits = 0;
    private static $misses = 0;
    private const MAX_CACHE_SIZE = 100;
    private const MAX_KEY_LENGTH = 128;
    private const MAX_VALUE_SIZE = 102400;
    
    private static function generateSecureKey($data) {
        $serialized = serialize($data);
        return hash('sha256', $serialized);
    }
    

    private static function isValidCachedContent($value) {
        if (!is_string($value)) {
            return false;
        }
        
        if (strlen($value) > self::MAX_VALUE_SIZE) {
            return false;
        }
        
        $dangerous_patterns = [
            '/<script[^>]*>.*?<\/script>/is',
            '/javascript:/i',
            '/on\w+\s*=/i',
            '/<iframe[^>]*srcdoc/i',
        ];
        
        foreach ($dangerous_patterns as $pattern) {
            if (preg_match($pattern, $value)) {
                return false;
            }
        }
        
        return true;
    }
    
    public static function get($key) {
        $secure_key = self::generateSecureKey($key);
        
        if (isset(self::$cache[$secure_key])) {
            $value = self::$cache[$secure_key];
            
            if (self::isValidCachedContent($value)) {
                self::$hits++;
                return $value;
            } else {
                unset(self::$cache[$secure_key]);
                self::$misses++;
                return null;
            }
        }
        
        self::$misses++;
        return null;
    }
    
    public static function set($key, $value) {
        if (!is_string($value) || strlen($value) > self::MAX_VALUE_SIZE) {
            return false;
        }
        
        $secure_key = self::generateSecureKey($key);
        
        if (count(self::$cache) >= self::MAX_CACHE_SIZE) {
            array_shift(self::$cache);
        }
        
        self::$cache[$secure_key] = $value;
        return true;
    }
    
    public static function clear() {
        self::$cache = [];
        self::$hits = 0;
        self::$misses = 0;
    }
    
    public static function getStats() {
        return [
            'hits' => self::$hits,
            'misses' => self::$misses,
            'size' => count(self::$cache)
        ];
    }
}

// ============================================================================
// LAZY LOADING MANAGER
// ============================================================================

final class LazyLoadManager {
    private static $lazy_blocks = [];
    private static $script_added = false;
    private const MAX_LAZY_BLOCKS = 50;
    private const MAX_BLOCK_SIZE = 51200; // 50KB per block
    
    private static function generateSecureBlockId($block) {
        $data = serialize($block);
        return 'block_' . hash('sha256', $data . random_bytes(16));
    }
    
    private static function sanitizeLazyHTML($html) {
        if (!is_string($html)) {
            return '';
        }
        
        if (strlen($html) > self::MAX_BLOCK_SIZE) {
            return '';
        }
        
        $html = preg_replace('/<script[^>]*>.*?<\/script>/is', '', $html);
        
        $html = preg_replace('/javascript:/i', '', $html);
        
        $html = preg_replace('/\s*on\w+\s*=\s*["\'][^"\']*["\']/i', '', $html);
        
        return $html;
    }
    
    public static function registerLazyBlock($block_data, $rendered_html) {
        if (count(self::$lazy_blocks) >= self::MAX_LAZY_BLOCKS) {
            return null;
        }
        
        $sanitized_html = self::sanitizeLazyHTML($rendered_html);
        if (empty($sanitized_html)) {
            return null;
        }
        
        $block_id = self::generateSecureBlockId($block_data);
        self::$lazy_blocks[$block_id] = $sanitized_html;
        
        return $block_id;
    }
    
    public static function getLazyPlaceholder($block_id, $type) {
        if (!preg_match('/^block_[a-f0-9]{64}$/', $block_id)) {
            return '';
        }
        
        $min_height = self::getMinHeightForType($type);
        
        $safe_block_id = htmlspecialchars($block_id, ENT_QUOTES, 'UTF-8');
        
        return sprintf(
            '<div class="lazy-block" data-block-id="%s" style="min-height:%dpx">
                <div class="lazy-placeholder">
                    <div class="lazy-spinner"></div>
                </div>
            </div>',
            $safe_block_id,
            (int)$min_height
        );
    }
    
    private static function getMinHeightForType($type) {
        $heights = [
            'hero' => 500,
            'features' => 400,
            'testimonials' => 300,
            'pricing' => 400,
            'gallery' => 300,
            'team' => 350,
            'video' => 400,
            'default' => 200
        ];
        
        return $heights[$type] ?? $heights['default'];
    }
    
    public static function outputLazyScript($nonce = '') {
        if (self::$script_added || empty(self::$lazy_blocks)) {
            return '';
        }
        
        self::$script_added = true;
        
        $blocks_json = json_encode(self::$lazy_blocks, JSON_HEX_TAG | JSON_HEX_AMP | JSON_HEX_APOS | JSON_HEX_QUOT);
        
        $nonce_attr = $nonce ? ' nonce="' . htmlspecialchars($nonce, ENT_QUOTES, 'UTF-8') . '"' : '';
        
        return <<<HTML
<script{$nonce_attr}>
(function() {
    'use strict';
    
    let lazyBlocks;
    try {
        lazyBlocks = {$blocks_json};
    } catch (e) {
        console.error('Failed to parse lazy blocks:', e);
        return;
    }
    
    const validBlockIdPattern = /^block_[a-f0-9]{64}$/;
    
    const observer = new IntersectionObserver((entries) => {
        entries.forEach(entry => {
            if (entry.isIntersecting) {
                const element = entry.target;
                const blockId = element.getAttribute('data-block-id');
                
                if (!blockId || !validBlockIdPattern.test(blockId)) {
                    console.warn('Invalid block ID detected');
                    observer.unobserve(element);
                    return;
                }
                
                if (lazyBlocks[blockId]) {
                    const temp = document.createElement('div');
                    temp.innerHTML = lazyBlocks[blockId];
                    
                    temp.querySelectorAll('script').forEach(s => s.remove());
                    
                    element.innerHTML = temp.innerHTML;
                    observer.unobserve(element);
                    delete lazyBlocks[blockId];
                    
                    element.dispatchEvent(new CustomEvent('blockLoaded', {
                        detail: { blockId: blockId }
                    }));
                }
            }
        });
    }, {
        rootMargin: '200px',
        threshold: 0.01
    });
    
    document.querySelectorAll('.lazy-block').forEach(block => {
        const blockId = block.getAttribute('data-block-id');
        
        if (blockId && validBlockIdPattern.test(blockId)) {
            observer.observe(block);
        }
    });
    
    if (!('IntersectionObserver' in window)) {
        document.querySelectorAll('.lazy-block').forEach(block => {
            const blockId = block.getAttribute('data-block-id');
            
            if (blockId && validBlockIdPattern.test(blockId) && lazyBlocks[blockId]) {
                const temp = document.createElement('div');
                temp.innerHTML = lazyBlocks[blockId];
                temp.querySelectorAll('script').forEach(s => s.remove());
                block.innerHTML = temp.innerHTML;
            }
        });
    }
})();
</script>
HTML;
    }
    
    public static function clear() {
        self::$lazy_blocks = [];
        self::$script_added = false;
    }
}

// ============================================================================
// ICON REGISTRY
// ============================================================================

final class IconRegistry {
    private static $used_icons = [];
    private static $used_social_icons = [];
    private static $custom_icons = [];
    private static $custom_social = [];
    private const MAX_TRACKED = 100;
    
    private const ALLOWED_ICONS = [
        'bolt', 'layout', 'clock', 'shield', 'chart', 'code',
        'star', 'heart', 'globe', 'users', 'settings', 'zap'
    ];
    
    private const ALLOWED_SOCIAL = [
        'twitter', 'github', 'linkedin', 'facebook', 'instagram', 'youtube',
        'tiktok', 'pinterest', 'reddit', 'discord', 'snapchat', 'whatsapp',
        'telegram', 'twitch', 'spotify', 'medium', 'slack', 'dribbble',
        'mastodon', 'patreon', 'kofi', 'vimeo', 'tumblr', 'stackoverflow',
        'gitlab', 'bluesky', 'line', 'wechat', 'xing'
    ];
    
    public static function registerIcon($name, $svg) {
        if (count(self::$custom_icons) >= 50) {
            return false;
        }
        
        if (!preg_match('/^[a-z0-9_-]+$/', $name)) {
            return false;
        }
        
        if (!is_string($svg) || strlen($svg) > 5000) {
            return false;
        }
        
        self::$custom_icons[$name] = $svg;
        return true;
    }
    
    public static function registerSocialIcon($platform, $svg) {
        if (count(self::$custom_social) >= 20) {
            return false;
        }
        
        if (!preg_match('/^[a-z0-9_-]+$/', $platform)) {
            return false;
        }
        
        if (!is_string($svg) || strlen($svg) > 5000) {
            return false;
        }
        
        self::$custom_social[$platform] = $svg;
        return true;
    }
    
    public static function getCustomIcon($name) {
        return self::$custom_icons[$name] ?? null;
    }
    
    public static function getCustomSocial($platform) {
        return self::$custom_social[$platform] ?? null;
    }
    
    public static function markIconUsed($icon) {
        if (count(self::$used_icons) >= self::MAX_TRACKED) {
            return false;
        }
        
        if (!in_array($icon, self::ALLOWED_ICONS, true) && !isset(self::$custom_icons[$icon])) {
            return false;
        }
        
        self::$used_icons[$icon] = true;
        return true;
    }
    
    public static function markSocialUsed($platform) {
        if (count(self::$used_social_icons) >= self::MAX_TRACKED) {
            return false;
        }
        
        if (!in_array($platform, self::ALLOWED_SOCIAL, true) && !isset(self::$custom_social[$platform])) {
            return false;
        }
        
        self::$used_social_icons[$platform] = true;
        return true;
    }
    
    public static function isIconAllowed($icon) {
        return in_array($icon, self::ALLOWED_ICONS, true) || isset(self::$custom_icons[$icon]);
    }
    
    public static function isSocialAllowed($platform) {
        return in_array($platform, self::ALLOWED_SOCIAL, true) || isset(self::$custom_social[$platform]);
    }
}

if (!isset($GLOBALS['REGISTERED_BLOCKS'])) {
    $GLOBALS['REGISTERED_BLOCKS'] = [];
}

// ============================================================================
// ICON HELPERS
// ============================================================================

function get_icon_svg($icon) {
    $custom = IconRegistry::getCustomIcon($icon);
    if ($custom !== null) {
        return $custom;
    }
    
    if (!IconRegistry::isIconAllowed($icon)) {
        $icon = 'bolt';
    }
    
    $icons = [
        'bolt' => '<svg fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><polygon points="13 2 3 14 12 14 11 22 21 10 12 10 13 2"/></svg>',
        'layout' => '<svg fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><rect x="3" y="3" width="18" height="18" rx="2"/><path d="M3 9h18M9 21V9"/></svg>',
        'clock' => '<svg fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><circle cx="12" cy="12" r="10"/><polyline points="12 6 12 12 16 14"/></svg>',
        'shield' => '<svg fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><path d="M12 22s8-4 8-10V5l-8-3-8 3v7c0 6 8 10 8 10z"/></svg>',
        'chart' => '<svg fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><line x1="18" y1="20" x2="18" y2="10"/><line x1="12" y1="20" x2="12" y2="4"/><line x1="6" y1="20" x2="6" y2="14"/></svg>',
        'code' => '<svg fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><polyline points="16 18 22 12 16 6"/><polyline points="8 6 2 12 8 18"/></svg>',
        'star' => '<svg fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><polygon points="12 2 15.09 8.26 22 9.27 17 14.14 18.18 21.02 12 17.77 5.82 21.02 7 14.14 2 9.27 8.91 8.26 12 2"/></svg>',
        'heart' => '<svg fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><path d="M20.84 4.61a5.5 5.5 0 0 0-7.78 0L12 5.67l-1.06-1.06a5.5 5.5 0 0 0-7.78 7.78l1.06 1.06L12 21.23l7.78-7.78 1.06-1.06a5.5 5.5 0 0 0 0-7.78z"/></svg>',
        'globe' => '<svg fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><circle cx="12" cy="12" r="10"/><line x1="2" y1="12" x2="22" y2="12"/><path d="M12 2a15.3 15.3 0 0 1 4 10 15.3 15.3 0 0 1-4 10 15.3 15.3 0 0 1-4-10 15.3 15.3 0 0 1 4-10z"/></svg>',
        'users' => '<svg fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><path d="M17 21v-2a4 4 0 0 0-4-4H5a4 4 0 0 0-4 4v2"/><circle cx="9" cy="7" r="4"/><path d="M23 21v-2a4 4 0 0 0-3-3.87"/><path d="M16 3.13a4 4 0 0 1 0 7.75"/></svg>',
        'settings' => '<svg fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><circle cx="12" cy="12" r="3"/><path d="M19.4 15a1.65 1.65 0 0 0 .33 1.82l.06.06a2 2 0 0 1 0 2.83 2 2 0 0 1-2.83 0l-.06-.06a1.65 1.65 0 0 0-1.82-.33 1.65 1.65 0 0 0-1 1.51V21a2 2 0 0 1-2 2 2 2 0 0 1-2-2v-.09A1.65 1.65 0 0 0 9 19.4a1.65 1.65 0 0 0-1.82.33l-.06.06a2 2 0 0 1-2.83 0 2 2 0 0 1 0-2.83l.06-.06a1.65 1.65 0 0 0 .33-1.82 1.65 1.65 0 0 0-1.51-1H3a2 2 0 0 1-2-2 2 2 0 0 1 2-2h.09A1.65 1.65 0 0 0 4.6 9a1.65 1.65 0 0 0-.33-1.82l-.06-.06a2 2 0 0 1 0-2.83 2 2 0 0 1 2.83 0l.06.06a1.65 1.65 0 0 0 1.82.33H9a1.65 1.65 0 0 0 1-1.51V3a2 2 0 0 1 2-2 2 2 0 0 1 2 2v.09a1.65 1.65 0 0 0 1 1.51 1.65 1.65 0 0 0 1.82-.33l.06-.06a2 2 0 0 1 2.83 0 2 2 0 0 1 0 2.83l-.06.06a1.65 1.65 0 0 0-.33 1.82V9a1.65 1.65 0 0 0 1.51 1H21a2 2 0 0 1 2 2 2 2 0 0 1-2 2h-.09a1.65 1.65 0 0 0-1.51 1z"/></svg>',
        'zap' => '<svg fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round"><polygon points="13 2 3 14 12 14 11 22 21 10 12 10 13 2"/></svg>',
    ];
    
    return $icons[$icon];
}

function render_icon($icon) {
    $icon = preg_replace('/[^a-z_-]/', '', strtolower($icon));
    
    if (!IconRegistry::markIconUsed($icon)) {
        $icon = 'bolt';
    }
    
    return get_icon_svg($icon);
}

function get_social_icon_svg($platform) {
    $custom = IconRegistry::getCustomSocial($platform);
    if ($custom !== null) {
        return $custom;
    }
    
    if (!IconRegistry::isSocialAllowed($platform)) {
        $platform = 'twitter';
    }
    
    $icons = [
        'twitter' => '<svg viewBox="0 0 24 24" fill="currentColor"><path d="M18.244 2.25h3.308l-7.227 8.26 8.502 11.24H16.17l-5.214-6.817L4.99 21.75H1.68l7.73-8.835L1.254 2.25H8.08l4.713 6.231zm-1.161 17.52h1.833L7.084 4.126H5.117z"/></svg>',
        'github' => '<svg viewBox="0 0 24 24" fill="currentColor"><path d="M12 2C6.477 2 2 6.477 2 12c0 4.42 2.865 8.17 6.839 9.49.5.092.682-.217.682-.482 0-.237-.008-.866-.013-1.7-2.782.603-3.369-1.34-3.369-1.34-.454-1.156-1.11-1.463-1.11-1.463-.908-.62.069-.608.069-.608 1.003.07 1.531 1.03 1.531 1.03.892 1.529 2.341 1.087 2.91.831.092-.646.35-1.086.636-1.336-2.22-.253-4.555-1.11-4.555-4.943 0-1.091.39-1.984 1.029-2.683-.103-.253-.446-1.27.098-2.647 0 0 .84-.269 2.75 1.025A9.578 9.578 0 0112 6.836c.85.004 1.705.114 2.504.336 1.909-1.294 2.747-1.025 2.747-1.025.546 1.377.203 2.394.1 2.647.64.699 1.028 1.592 1.028 2.683 0 3.842-2.339 4.687-4.566 4.935.359.309.678.919.678 1.852 0 1.336-.012 2.415-.012 2.743 0 .267.18.578.688.48C19.138 20.167 22 16.418 22 12c0-5.523-4.477-10-10-10z"/></svg>',
        'linkedin' => '<svg viewBox="0 0 24 24" fill="currentColor"><path d="M20.447 20.452h-3.554v-5.569c0-1.328-.027-3.037-1.852-3.037-1.853 0-2.136 1.445-2.136 2.939v5.667H9.351V9h3.414v1.561h.046c.477-.9 1.637-1.85 3.37-1.85 3.601 0 4.267 2.37 4.267 5.455v6.286zM5.337 7.433c-1.144 0-2.063-.926-2.063-2.065 0-1.138.92-2.063 2.063-2.063 1.14 0 2.064.925 2.064 2.063 0 1.139-.925 2.065-2.064 2.065zm1.782 13.019H3.555V9h3.564v11.452zM22.225 0H1.771C.792 0 0 .774 0 1.729v20.542C0 23.227.792 24 1.771 24h20.451C23.2 24 24 23.227 24 22.271V1.729C24 .774 23.2 0 22.222 0h.003z"/></svg>',
        'facebook' => '<svg viewBox="0 0 24 24" fill="currentColor"><path d="M24 12.073c0-6.627-5.373-12-12-12s-12 5.373-12 12c0 5.99 4.388 10.954 10.125 11.854v-8.385H7.078v-3.47h3.047V9.43c0-3.007 1.792-4.669 4.533-4.669 1.312 0 2.686.235 2.686.235v2.953H15.83c-1.491 0-1.956.925-1.956 1.874v2.25h3.328l-.532 3.47h-2.796v8.385C19.612 23.027 24 18.062 24 12.073z"/></svg>',
        'instagram' => '<svg viewBox="0 0 24 24" fill="currentColor"><path d="M12 2.163c3.204 0 3.584.012 4.85.07 3.252.148 4.771 1.691 4.919 4.919.058 1.265.069 1.645.069 4.849 0 3.205-.012 3.584-.069 4.849-.149 3.225-1.664 4.771-4.919 4.919-1.266.058-1.644.07-4.85.07-3.204 0-3.584-.012-4.849-.07-3.26-.149-4.771-1.699-4.919-4.92-.058-1.265-.07-1.644-.07-4.849 0-3.204.013-3.583.07-4.849.149-3.227 1.664-4.771 4.919-4.919 1.266-.057 1.645-.069 4.849-.069zM12 0C8.741 0 8.333.014 7.053.072 2.695.272.273 2.69.073 7.052.014 8.333 0 8.741 0 12c0 3.259.014 3.668.072 4.948.2 4.358 2.618 6.78 6.98 6.98C8.333 23.986 8.741 24 12 24c3.259 0 3.668-.014 4.948-.072 4.354-.2 6.782-2.618 6.979-6.98.059-1.28.073-1.689.073-4.948 0-3.259-.014-3.667-.072-4.947-.196-4.354-2.617-6.78-6.979-6.98C15.668.014 15.259 0 12 0zm0 5.838a6.162 6.162 0 100 12.324 6.162 6.162 0 000-12.324zM12 16a4 4 0 110-8 4 4 0 010 8zm6.406-11.845a1.44 1.44 0 100 2.881 1.44 1.44 0 000-2.881z"/></svg>',
        'youtube' => '<svg viewBox="0 0 24 24" fill="currentColor"><path d="M23.498 6.186a3.016 3.016 0 0 0-2.122-2.136C19.505 3.545 12 3.545 12 3.545s-7.505 0-9.377.505A3.017 3.017 0 0 0 .502 6.186C0 8.07 0 12 0 12s0 3.93.502 5.814a3.016 3.016 0 0 0 2.122 2.136c1.871.505 9.376.505 9.376.505s7.505 0 9.377-.505a3.015 3.015 0 0 0 2.122-2.136C24 15.93 24 12 24 12s0-3.93-.502-5.814zM9.545 15.568V8.432L15.818 12l-6.273 3.568z"/></svg>',
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        'bluesky' => '<svg viewBox="0 0 24 24" fill="currentColor"><path d="M12 10.8c-1.087-2.114-4.046-6.053-6.798-7.995C2.566.944 1.561 1.266.902 1.565.139 1.908 0 3.08 0 3.768c0 .69.378 5.65.624 6.479.815 2.736 3.713 3.66 6.383 3.364.136-.02.275-.039.415-.056-.138.022-.276.04-.415.056-3.912.58-7.387 2.005-2.83 7.078 5.013 5.19 6.87-1.113 7.823-4.308.953 3.195 2.05 9.271 7.733 4.308 4.267-4.308 1.172-6.498-2.74-7.078a8.741 8.741 0 0 1-.415-.056c.14.017.279.036.415.056 2.67.297 5.568-.628 6.383-3.364.246-.828.624-5.79.624-6.478 0-.69-.139-1.861-.902-2.206-.659-.298-1.664-.62-4.3 1.24C16.046 4.748 13.087 8.687 12 10.8z"/></svg>',
        'line' => '<svg viewBox="0 0 24 24" fill="currentColor"><path d="M19.365 9.863c.349 0 .63.285.63.631 0 .345-.281.63-.63.63H17.61v1.125h1.755c.349 0 .63.283.63.63 0 .344-.281.629-.63.629h-2.386c-.345 0-.627-.285-.627-.629V8.108c0-.345.282-.63.63-.63h2.386c.346 0 .627.285.627.63 0 .349-.281.63-.63.63H17.61v1.125h1.755zm-3.855 3.016c0 .27-.174.51-.432.596-.064.021-.133.031-.199.031-.211 0-.391-.09-.51-.25l-2.443-3.317v2.94c0 .344-.279.629-.631.629-.346 0-.626-.285-.626-.629V8.108c0-.27.173-.51.43-.595.06-.023.136-.033.194-.033.195 0 .375.105.495.254l2.462 3.33V8.108c0-.345.282-.63.63-.63.345 0 .63.285.63.63v4.771zm-5.741 0c0 .344-.282.629-.631.629-.345 0-.627-.285-.627-.629V8.108c0-.345.282-.63.63-.63.346 0 .628.285.628.63v4.771zm-2.466.629H4.917c-.345 0-.63-.285-.63-.629V8.108c0-.345.285-.63.63-.63.348 0 .63.285.63.63v4.141h1.756c.348 0 .629.283.629.63 0 .344-.282.629-.629.629M24 10.314C24 4.943 18.615.572 12 .572S0 4.943 0 10.314c0 4.811 4.27 8.842 10.035 9.608.391.082.923.258 1.058.59.12.301.079.766.038 1.08l-.164 1.02c-.045.301-.24 1.186 1.049.645 1.291-.539 6.916-4.078 9.436-6.975C23.176 14.393 24 12.458 24 10.314"/></svg>',
        'wechat' => '<svg viewBox="0 0 24 24" fill="currentColor"><path d="M8.691 2.188C3.891 2.188 0 5.476 0 9.53c0 2.212 1.17 4.203 3.002 5.55a.59.59 0 0 1 .213.665l-.39 1.48c-.019.07-.048.141-.048.213 0 .163.13.295.29.295a.326.326 0 0 0 .167-.054l1.903-1.114a.864.864 0 0 1 .717-.098 10.16 10.16 0 0 0 2.837.403c.276 0 .543-.027.811-.05-.857-2.578.157-4.972 1.932-6.446 1.703-1.415 3.882-1.98 5.853-1.838-.576-3.583-4.196-6.348-8.596-6.348zM5.785 5.991c.642 0 1.162.529 1.162 1.18a1.17 1.17 0 0 1-1.162 1.178A1.17 1.17 0 0 1 4.623 7.17c0-.651.52-1.18 1.162-1.18zm5.813 0c.642 0 1.162.529 1.162 1.18a1.17 1.17 0 0 1-1.162 1.178 1.17 1.17 0 0 1-1.162-1.178c0-.651.52-1.18 1.162-1.18zm5.34 2.867c-1.797-.052-3.746.512-5.28 1.786-1.72 1.428-2.687 3.72-1.78 6.22.942 2.453 3.666 4.229 6.884 4.229.826 0 1.622-.12 2.361-.336a.722.722 0 0 1 .598.082l1.584.926a.272.272 0 0 0 .14.047c.134 0 .24-.111.24-.247 0-.06-.023-.12-.038-.177l-.327-1.233a.582.582 0 0 1-.023-.156.49.49 0 0 1 .201-.398C23.024 18.48 24 16.82 24 14.98c0-3.21-2.931-5.837-6.656-6.088V8.89c-.135-.01-.27-.027-.407-.027zm-2.53 3.274c.535 0 .969.44.969.982a.976.976 0 0 1-.969.983.976.976 0 0 1-.969-.983c0-.542.434-.982.969-.982zm4.844 0c.535 0 .969.44.969.982a.976.976 0 0 1-.969.983.976.976 0 0 1-.969-.983c0-.542.434-.982.969-.982z"/></svg>',
        'xing' => '<svg viewBox="0 0 24 24" fill="currentColor"><path d="M18.188 0c-.517 0-.741.325-.927.66 0 0-7.455 13.224-7.702 13.657.015.024 4.919 9.023 4.919 9.023.17.308.436.66.967.66h3.454c.211 0 .375-.078.463-.22.089-.151.089-.346-.009-.536l-4.879-8.916c-.004-.006-.004-.016 0-.022L22.139.756c.095-.191.097-.387.006-.535C22.056.078 21.894 0 21.686 0h-3.498zM3.648 4.74c-.211 0-.385.074-.473.216-.09.149-.078.339.02.531l2.34 4.05c.004.01.004.016 0 .021L1.86 16.051c-.099.188-.093.381 0 .529.085.142.239.234.45.234h3.461c.518 0 .766-.348.945-.667l3.734-6.609-2.378-4.155c-.172-.315-.434-.659-.962-.659H3.648v.016z"/></svg>',
    ];
    
    return $icons[$platform];
}

function render_social_icon($platform) {
    $platform = preg_replace('/[^a-z_-]/', '', strtolower($platform));
    
    if (!IconRegistry::markSocialUsed($platform)) {
        $platform = 'twitter';
    }
    
    return get_social_icon_svg($platform);
}

// ============================================================================
// BLOCK RENDERING WITH CACHING AND LAZY LOADING
// ============================================================================

function render_block($block, $options = []) {
    global $REGISTERED_BLOCKS;

    if (!is_array($block)) {
        return '';
    }

    $type = $block['type'] ?? '';
    $data = $block['data'] ?? [];
    
    $cache_key = ['type' => $type, 'data' => $data, 'id' => $block['id'] ?? ''];
    
    $cached = RenderCache::get($cache_key);
    if ($cached !== null) {
        return $cached;
    }
    
    $id = '';
    if (!empty($block['id'])) {
        $clean_id = preg_replace('/[^a-zA-Z0-9_-]/', '', $block['id']);
        $id = ' id="' . e($clean_id) . '"';
    }

    if (isset($REGISTERED_BLOCKS[$type]) && is_callable($REGISTERED_BLOCKS[$type]['render'])) {
        $html = call_user_func(
            $REGISTERED_BLOCKS[$type]['render'],
            $data,
            $id
        );
        
        RenderCache::set($cache_key, $html);
        return $html;
    }

    $allowed_blocks = [
        'hero', 'stats', 'features', 'testimonials', 'pricing', 'cta',
        'text', 'image', 'image-text', 'product-cards', 'video',
        'gallery', 'faq', 'team', 'audio', 'countdown', 'newsletter', 'html'
    ];
    
    if (!in_array($type, $allowed_blocks, true)) {
        return '';
    }

    $lazy_types = ['gallery', 'team', 'testimonials', 'video', 'audio'];
    $should_lazy_load = isset($options['enable_lazy']) && $options['enable_lazy'] 
                        && in_array($type, $lazy_types, true);
    
    $html = '';
    
    switch ($type) {
        case 'hero': $html = render_hero($data, $id); break;
        case 'stats': $html = render_stats($data, $id); break;
        case 'features': $html = render_features($data, $id); break;
        case 'testimonials': $html = render_testimonials($data, $id); break;
        case 'pricing': $html = render_pricing($data, $id); break;
        case 'cta': $html = render_cta($data, $id); break;
        case 'text': $html = render_text($data, $id); break;
        case 'image': $html = render_image($data, $id); break;
        case 'image-text': $html = render_image_text($data, $id); break;
        case 'product-cards': $html = render_product_cards($data, $id); break;
        case 'video': $html = render_video($data, $id); break;
        case 'gallery': $html = render_gallery($data, $id); break;
        case 'faq': $html = render_faq($data, $id); break;
        case 'team': $html = render_team($data, $id); break;
        case 'audio': $html = render_audio($data, $id); break;
        case 'countdown': $html = render_countdown($data, $id); break;
        case 'newsletter': $html = render_newsletter($data, $id); break;
        case 'html': $html = $data['html'] ?? ''; break;
        default: return '';
    }
    
    if (!empty($html)) {
        RenderCache::set($cache_key, $html);
    }
    
    if ($should_lazy_load && !empty($html)) {
        $block_id = LazyLoadManager::registerLazyBlock($block, $html);
        if ($block_id) {
            return LazyLoadManager::getLazyPlaceholder($block_id, $type);
        }
    }
    
    return $html;
}

/**
 * Hero block
 */
function render_hero($d, $id = '') {
    if (!is_array($d)) return '';
    ob_start(); ?>
    <section class="hero"<?= $id ?>>
        <div class="hero-grid"></div>
        <div class="container hero-content">
            <?php if (!empty($d['badge'])): ?><div class="badge"><span class="badge-dot"></span><span><?= e($d['badge']) ?></span></div><?php endif; ?>
            <h1><?= e($d['title'] ?? '') ?></h1>
            <p><?= e($d['subtitle'] ?? '') ?></p>
            <div class="hero-buttons">
                <?php if (!empty($d['button_primary'])): ?><a href="<?= e($d['button_primary_url'] ?? '#') ?>" class="btn btn-primary"><?= e($d['button_primary']) ?></a><?php endif; ?>
                <?php if (!empty($d['button_secondary'])): ?><a href="<?= e($d['button_secondary_url'] ?? '#') ?>" class="btn btn-outline"><?= e($d['button_secondary']) ?></a><?php endif; ?>
            </div>
        </div>
    </section>
    <?php return ob_get_clean();
}

/**
 * Stats block
 */
function render_stats($d, $id = '') {
    if (!is_array($d)) return '';
    $items = $d['items'] ?? [];
    if (empty($items) || !is_array($items)) return '';
    ob_start(); ?>
    <section class="stats"<?= $id ?>>
        <div class="container">
            <div class="stats-grid">
                <?php foreach ($items as $item): if (!is_array($item)) continue; ?>
                <div class="stat-item"><h3><?= e($item['value'] ?? '') ?></h3><p><?= e($item['label'] ?? '') ?></p></div>
                <?php endforeach; ?>
            </div>
        </div>
    </section>
    <?php return ob_get_clean();
}

/**
 * Features block
 */
function render_features($d, $id = '') {
    if (!is_array($d)) return '';
    $items = $d['items'] ?? [];
    ob_start(); ?>
    <section class="features"<?= $id ?>>
        <div class="container">
            <?php if (!empty($d['title'])): ?>
            <div class="section-header">
                <h2><?= e($d['title']) ?></h2>
                <?php if (!empty($d['subtitle'])): ?><p><?= e($d['subtitle']) ?></p><?php endif; ?>
            </div>
            <?php endif; ?>
            <?php if (!empty($items) && is_array($items)): ?>
            <div class="features-grid">
                <?php foreach ($items as $item): if (!is_array($item)) continue; ?>
                <div class="feature-card">
                    <div class="feature-icon"><?= render_icon($item['icon'] ?? 'bolt') ?></div>
                    <h3><?= e($item['title'] ?? '') ?></h3>
                    <p><?= e($item['description'] ?? '') ?></p>
                </div>
                <?php endforeach; ?>
            </div>
            <?php endif; ?>
        </div>
    </section>
    <?php return ob_get_clean();
}

/**
 * Testimonials block
 */
function render_testimonials($d, $id = '') {
    if (!is_array($d)) return '';
    $items = $d['items'] ?? [];
    ob_start(); ?>
    <section class="testimonials"<?= $id ?>>
        <div class="container">
            <?php if (!empty($d['title'])): ?>
            <div class="section-header">
                <h2><?= e($d['title']) ?></h2>
                <?php if (!empty($d['subtitle'])): ?><p><?= e($d['subtitle']) ?></p><?php endif; ?>
            </div>
            <?php endif; ?>
            <?php if (!empty($items) && is_array($items)): ?>
            <div class="testimonials-grid">
                <?php foreach ($items as $item): if (!is_array($item)) continue; ?>
                <div class="testimonial-card">
                    <p>"<?= e($item['quote'] ?? '') ?>"</p>
                    <div class="testimonial-author">
                        <div class="testimonial-avatar"><?= e($item['initials'] ?? '') ?></div>
                        <div class="testimonial-info"><h4><?= e($item['name'] ?? '') ?></h4><span><?= e($item['role'] ?? '') ?></span></div>
                    </div>
                </div>
                <?php endforeach; ?>
            </div>
            <?php endif; ?>
        </div>
    </section>
    <?php return ob_get_clean();
}

/**
 * Pricing block
 */
function render_pricing($d, $id = '') {
    if (!is_array($d)) return '';
    $items = $d['items'] ?? [];
    ob_start(); ?>
    <section class="pricing"<?= $id ?>>
        <div class="container">
            <?php if (!empty($d['title'])): ?>
            <div class="section-header">
                <h2><?= e($d['title']) ?></h2>
                <?php if (!empty($d['subtitle'])): ?><p><?= e($d['subtitle']) ?></p><?php endif; ?>
            </div>
            <?php endif; ?>
            <?php if (!empty($items) && is_array($items)): ?>
            <div class="pricing-grid">
                <?php foreach ($items as $item): if (!is_array($item)) continue; ?>
                <div class="pricing-card <?= !empty($item['featured']) ? 'featured' : '' ?>">
                    <?php if (!empty($item['featured'])): ?><span class="pricing-popular">Most Popular</span><?php endif; ?>
                    <h3><?= e($item['name'] ?? '') ?></h3>
                    <div class="price"><?= e($item['price'] ?? '') ?><span><?= e($item['period'] ?? '') ?></span></div>
                    <p class="description"><?= e($item['description'] ?? '') ?></p>
                    <?php if (!empty($item['features']) && is_array($item['features'])): ?>
                    <ul class="pricing-features">
                        <?php foreach ($item['features'] as $feature): ?>
                        <li><svg width="20" height="20" fill="none" stroke="currentColor" stroke-width="2"><polyline points="20 6 9 17 4 12"/></svg><?= e($feature) ?></li>
                        <?php endforeach; ?>
                    </ul>
                    <?php endif; ?>
                    <a href="<?= e($item['button_url'] ?? '#') ?>" class="btn <?= !empty($item['featured']) ? 'btn-primary' : 'btn-outline' ?>"><?= e($item['button_text'] ?? $item['button'] ?? 'Get Started') ?></a>
                </div>
                <?php endforeach; ?>
            </div>
            <?php endif; ?>
        </div>
    </section>
    <?php return ob_get_clean();
}

/**
 * CTA block
 */
function render_cta($d, $id = '') {
    if (!is_array($d)) return '';
    ob_start(); ?>
    <section class="cta"<?= $id ?>>
        <div class="container">
            <div class="cta-inner">
                <h2><?= e($d['title'] ?? '') ?></h2>
                <p><?= e($d['subtitle'] ?? '') ?></p>
                <div class="cta-buttons">
                    <?php if (!empty($d['button_primary'])): ?><a href="<?= e($d['button_primary_url'] ?? '#') ?>" class="btn btn-primary"><?= e($d['button_primary']) ?></a><?php endif; ?>
                    <?php if (!empty($d['button_secondary'])): ?><a href="<?= e($d['button_secondary_url'] ?? '#') ?>" class="btn btn-outline"><?= e($d['button_secondary']) ?></a><?php endif; ?>
                </div>
            </div>
        </div>
    </section>
    <?php return ob_get_clean();
}

/**
 * Text block
 */
function render_text($d, $id = '') {
    if (!is_array($d)) return '';
    ob_start(); ?>
    <section class="text-section"<?= $id ?>>
        <div class="container">
            <?php if (!empty($d['title'])): ?><h2><?= e($d['title']) ?></h2><?php endif; ?>
            <div class="text-content"><?= nl2br(e($d['content'] ?? '')) ?></div>
        </div>
    </section>
    <?php return ob_get_clean();
}

/**
 * Image block
 */
function render_image($d, $id = '') {
    if (!is_array($d) || empty($d['url'])) return '';
    ob_start(); ?>
    <section class="image-section"<?= $id ?>>
        <div class="container">
            <figure>
                <img src="<?= e($d['url']) ?>" alt="<?= e($d['alt'] ?? '') ?>" loading="lazy">
                <?php if (!empty($d['caption'])): ?><figcaption><?= e($d['caption']) ?></figcaption><?php endif; ?>
            </figure>
        </div>
    </section>
    <?php return ob_get_clean();
}

/**
 * Image + Text block
 */
function render_image_text($d, $id = '') {
    if (!is_array($d)) return '';
    $allowed_positions = ['left', 'right'];
    $image_pos = in_array($d['image_position'] ?? '', $allowed_positions, true) 
        ? $d['image_position'] 
        : 'left';
    
    ob_start(); ?>
    <section class="image-text"<?= $id ?>>
        <div class="container">
            <div class="image-text-grid image-text-<?= e($image_pos) ?>">
                <div class="image-text-image">
                    <img src="<?= e($d['image_url'] ?? '') ?>" alt="<?= e($d['image_alt'] ?? '') ?>" loading="lazy">
                </div>
                <div class="image-text-content">
                    <?php if (!empty($d['subtitle'])): ?><p class="section-subtitle"><?= e($d['subtitle']) ?></p><?php endif; ?>
                    <?php if (!empty($d['title'])): ?><h2><?= e($d['title']) ?></h2><?php endif; ?>
                    <div class="text-content"><?= nl2br(e($d['content'] ?? '')) ?></div>
                    <?php if (!empty($d['button_text'])): ?>
                    <a href="<?= e($d['button_url'] ?? '#') ?>" class="btn btn-primary"><?= e($d['button_text']) ?></a>
                    <?php endif; ?>
                </div>
            </div>
        </div>
    </section>
    <?php return ob_get_clean();
}

/**
 * Product Cards block
 */
function render_product_cards($d, $id = '') {
    if (!is_array($d)) return '';
    $products = $d['products'] ?? [];
    if (empty($products) || !is_array($products)) return '';
    ob_start(); ?>
    <section class="product-cards"<?= $id ?>>
        <div class="container">
            <?php if (!empty($d['title'])): ?>
            <div class="section-header">
                <h2><?= e($d['title']) ?></h2>
                <?php if (!empty($d['subtitle'])): ?><p><?= e($d['subtitle']) ?></p><?php endif; ?>
            </div>
            <?php endif; ?>
            <div class="products-grid">
                <?php foreach ($products as $product): if (!is_array($product)) continue; ?>
                <div class="product-card">
                    <?php if (!empty($product['image'])): ?>
                    <div class="product-image">
                        <img src="<?= e($product['image']) ?>" alt="<?= e($product['title'] ?? '') ?>" width="48" height="48" loading="lazy">
                    </div>
                    <?php endif; ?>
                    <h3><?= e($product['title'] ?? '') ?></h3>
                    <p class="product-description"><?= e($product['description'] ?? '') ?></p>
                    <?php if (!empty($product['features']) && is_array($product['features'])): ?>
                    <ul class="product-features">
                        <?php foreach ($product['features'] as $feature): ?>
                        <li><?= e($feature) ?></li>
                        <?php endforeach; ?>
                    </ul>
                    <?php endif; ?>
                    <?php if (!empty($product['button_text'])): ?>
                    <a href="<?= e($product['button_url'] ?? '#') ?>" class="btn btn-primary btn-sm"><?= e($product['button_text']) ?></a>
                    <?php endif; ?>
                </div>
                <?php endforeach; ?>
            </div>
        </div>
    </section>
    <?php return ob_get_clean();
}

/**
 * Video block
 */
function render_video($d, $id = '') {
    if (!is_array($d) || empty($d['url'])) return '';
    
    $url = $d['url'];
    $type = $d['type'] ?? 'url';
    
    $allowed_types = ['url', 'youtube', 'facebook'];
    if (!in_array($type, $allowed_types, true)) {
        $type = 'url';
    }
    
    if ($type === 'url') {
        if (preg_match('/youtube\.com|youtu\.be/i', $url)) {
            $type = 'youtube';
        } elseif (preg_match('/facebook\.com|fb\.watch/i', $url)) {
            $type = 'facebook';
        }
    }
    
    ob_start(); ?>
    <section class="video-section"<?= $id ?>>
        <div class="container">
            <?php if (!empty($d['title'])): ?>
            <div class="section-header">
                <h2><?= e($d['title']) ?></h2>
                <?php if (!empty($d['subtitle'])): ?><p><?= e($d['subtitle']) ?></p><?php endif; ?>
            </div>
            <?php endif; ?>
            <div class="video-wrapper">
                <?php if ($type === 'youtube'): 
                    preg_match('/(?:youtube\.com\/(?:[^\/]+\/.+\/|(?:v|e(?:mbed)?)\/|.*[?&]v=)|youtu\.be\/)([^"&?\/ ]{11})/i', $url, $matches);
                    $video_id = $matches[1] ?? '';
                    if ($video_id && preg_match('/^[a-zA-Z0-9_-]{11}$/', $video_id)):
                ?>
                    <iframe src="https://www.youtube.com/embed/<?= e($video_id) ?>" frameborder="0" allow="accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture" allowfullscreen loading="lazy"></iframe>
                <?php endif; 
                elseif ($type === 'facebook'): ?>
                    <iframe src="https://www.facebook.com/plugins/video.php?href=<?= urlencode($url) ?>&show_text=false" frameborder="0" allow="autoplay; clipboard-write; encrypted-media; picture-in-picture; web-share" allowfullscreen loading="lazy"></iframe>
                <?php else: ?>
                    <video controls preload="metadata">
                        <source src="<?= e($url) ?>" type="video/mp4">
                        Your browser does not support the video tag.
                    </video>
                <?php endif; ?>
            </div>
            <?php if (!empty($d['caption'])): ?>
                <p class="video-caption"><?= e($d['caption']) ?></p>
            <?php endif; ?>
        </div>
    </section>
    <?php return ob_get_clean();
}

/**
 * Gallery block
 */
function render_gallery($d, $id = '') {
    if (!is_array($d)) return '';
    $images = $d['images'] ?? [];
    if (empty($images) || !is_array($images)) return '';
    ob_start(); ?>
    <section class="gallery-section"<?= $id ?>>
        <div class="container">
            <?php if (!empty($d['title'])): ?>
            <div class="section-header">
                <h2><?= e($d['title']) ?></h2>
                <?php if (!empty($d['subtitle'])): ?><p><?= e($d['subtitle']) ?></p><?php endif; ?>
            </div>
            <?php endif; ?>
            <div class="gallery-grid">
                <?php foreach ($images as $image): if (!is_array($image)) continue; ?>
                <div class="gallery-item">
                    <img src="<?= e($image['url'] ?? '') ?>" alt="<?= e($image['alt'] ?? '') ?>" loading="lazy">
                    <?php if (!empty($image['caption'])): ?>
                        <div class="gallery-caption"><?= e($image['caption']) ?></div>
                    <?php endif; ?>
                </div>
                <?php endforeach; ?>
            </div>
        </div>
    </section>
    <?php return ob_get_clean();
}

/**
 * FAQ block
 */
function render_faq($d, $id = '') {
    if (!is_array($d)) return '';
    $items = $d['items'] ?? [];
    if (empty($items) || !is_array($items)) return '';
    ob_start(); ?>
    <section class="faq-section"<?= $id ?>>
        <div class="container">
            <?php if (!empty($d['title'])): ?>
            <div class="section-header">
                <h2><?= e($d['title']) ?></h2>
                <?php if (!empty($d['subtitle'])): ?><p><?= e($d['subtitle']) ?></p><?php endif; ?>
            </div>
            <?php endif; ?>
            <div class="faq-list">
                <?php foreach ($items as $item): if (!is_array($item)) continue; ?>
                <details class="faq-item">
                    <summary class="faq-question"><?= e($item['question'] ?? '') ?></summary>
                    <div class="faq-answer"><?= nl2br(e($item['answer'] ?? '')) ?></div>
                </details>
                <?php endforeach; ?>
            </div>
        </div>
    </section>
    <?php return ob_get_clean();
}

/**
 * Team block
 */
function render_team($d, $id = '') {
    if (!is_array($d)) return '';
    $members = $d['members'] ?? [];
    if (empty($members) || !is_array($members)) return '';
    ob_start(); ?>
    <section class="team-section"<?= $id ?>>
        <div class="container">
            <?php if (!empty($d['title'])): ?>
            <div class="section-header">
                <h2><?= e($d['title']) ?></h2>
                <?php if (!empty($d['subtitle'])): ?><p><?= e($d['subtitle']) ?></p><?php endif; ?>
            </div>
            <?php endif; ?>
            <div class="team-grid">
                <?php foreach ($members as $member): if (!is_array($member)) continue; ?>
                <div class="team-member">
                    <?php if (!empty($member['image'])): ?>
                        <img src="<?= e($member['image']) ?>" alt="<?= e($member['name'] ?? '') ?>" class="team-photo" loading="lazy">
                    <?php else: ?>
                        <div class="team-avatar"><?= e($member['initials'] ?? substr($member['name'] ?? '?', 0, 2)) ?></div>
                    <?php endif; ?>
                    <h3><?= e($member['name'] ?? '') ?></h3>
                    <p class="team-role"><?= e($member['role'] ?? '') ?></p>
                    <?php if (!empty($member['bio'])): ?>
                        <p class="team-bio"><?= e($member['bio']) ?></p>
                    <?php endif; ?>
                    <?php if (!empty($member['social']) && is_array($member['social'])): ?>
                    <div class="team-social">
                        <?php foreach ($member['social'] as $social): if (!is_array($social)) continue; ?>
                        <a href="<?= e($social['url'] ?? '#') ?>" target="_blank" rel="noopener" class="team-social-link">
                            <?= render_social_icon($social['platform'] ?? 'twitter') ?>
                        </a>
                        <?php endforeach; ?>
                    </div>
                    <?php endif; ?>
                </div>
                <?php endforeach; ?>
            </div>
        </div>
    </section>
    <?php return ob_get_clean();
}

/**
 * Audio block
 */
function render_audio($d, $id = '') {
    if (!is_array($d) || empty($d['url'])) return '';
    ob_start(); ?>
    <section class="audio-section"<?= $id ?>>
        <div class="container">
            <?php if (!empty($d['title'])): ?>
            <div class="section-header">
                <h2><?= e($d['title']) ?></h2>
                <?php if (!empty($d['subtitle'])): ?><p><?= e($d['subtitle']) ?></p><?php endif; ?>
            </div>
            <?php endif; ?>
            <div class="audio-wrapper">
                <audio controls preload="metadata" class="audio-player">
                    <source src="<?= e($d['url']) ?>" type="audio/mpeg">
                    Your browser does not support the audio element.
                </audio>
                <?php if (!empty($d['music_link'])): ?>
                <a href="<?= e($d['music_link']) ?>" class="btn btn-outline" target="_blank" rel="noopener"><?= e($d['music_link_text'] ?? 'Download') ?></a>
                <?php endif; ?>
            </div>
        </div>
    </section>
    <?php return ob_get_clean();
}

/**
 * Countdown block
 */
function render_countdown($d, $id = '') {
    if (!is_array($d) || empty($d['target_date'])) return '';
    
    $target_date = filter_var($d['target_date'], FILTER_SANITIZE_STRING);
    $target_time = filter_var($d['target_time'] ?? '00:00', FILTER_SANITIZE_STRING);
    
    if (!preg_match('/^\d{4}-\d{2}-\d{2}$/', $target_date)) {
        return '';
    }
    
    $target_datetime = $target_date . ' ' . $target_time;
    $timer_id = 'timer_' . hash('sha256', $target_datetime . random_bytes(8));
    
    ob_start(); ?>
    <section class="countdown-section"<?= $id ?>>
        <div class="container">
            <?php if (!empty($d['title'])): ?>
            <div class="section-header">
                <h2><?= e($d['title']) ?></h2>
                <?php if (!empty($d['subtitle'])): ?><p><?= e($d['subtitle']) ?></p><?php endif; ?>
            </div>
            <?php endif; ?>
            <div class="countdown-timer" id="<?= e($timer_id) ?>" data-target="<?= e($target_datetime) ?>">
                <div class="countdown-item">
                    <div class="countdown-value" data-days>00</div>
                    <div class="countdown-label">Days</div>
                </div>
                <div class="countdown-item">
                    <div class="countdown-value" data-hours>00</div>
                    <div class="countdown-label">Hours</div>
                </div>
                <div class="countdown-item">
                    <div class="countdown-value" data-minutes>00</div>
                    <div class="countdown-label">Minutes</div>
                </div>
                <div class="countdown-item">
                    <div class="countdown-value" data-seconds>00</div>
                    <div class="countdown-label">Seconds</div>
                </div>
            </div>
        </div>
    </section>
    <script>
    (function() {
        'use strict';
        const timer = document.getElementById(<?= json_encode($timer_id) ?>);
        if (!timer) return;
        
        const targetDateStr = <?= json_encode($target_datetime) ?>;
        const targetDate = new Date(targetDateStr.replace(' ', 'T') + 'Z').getTime();
        if (isNaN(targetDate)) return;
        
        function updateCountdown() {
            const now = Date.now();
            const distance = targetDate - now;
            
            if (distance < 0) {
                timer.querySelector('[data-days]').textContent = '00';
                timer.querySelector('[data-hours]').textContent = '00';
                timer.querySelector('[data-minutes]').textContent = '00';
                timer.querySelector('[data-seconds]').textContent = '00';
                return;
            }
            
            const days = Math.floor(distance / (1000 * 60 * 60 * 24));
            const hours = Math.floor((distance % (1000 * 60 * 60 * 24)) / (1000 * 60 * 60));
            const minutes = Math.floor((distance % (1000 * 60 * 60)) / (1000 * 60));
            const seconds = Math.floor((distance % (1000 * 60)) / 1000);
            
            timer.querySelector('[data-days]').textContent = String(days).padStart(2, '0');
            timer.querySelector('[data-hours]').textContent = String(hours).padStart(2, '0');
            timer.querySelector('[data-minutes]').textContent = String(minutes).padStart(2, '0');
            timer.querySelector('[data-seconds]').textContent = String(seconds).padStart(2, '0');
        }
        
        updateCountdown();
        setInterval(updateCountdown, 1000);
    })();
    </script>
    <?php return ob_get_clean();
}

/**
 * Newsletter block
 */
function render_newsletter($d, $id = '') {
    if (!is_array($d)) return '';
    
    $section_id = '';
    if (!empty($id) && preg_match('/id="([^"]+)"/', $id, $m)) {
        $section_id = $m[1];
    }

    ob_start(); ?>
    <section class="newsletter-section"<?= $id ?>>
        <?php if ($section_id !== 'newsletter'): ?>
            <div id="newsletter" style="height:1px; margin-top:-1px;"></div>
        <?php endif; ?>
        <div class="container">
            <div class="newsletter-inner">
                <?php if (!empty($d['title'])): ?>
                    <h2><?= e($d['title']) ?></h2>
                <?php endif; ?>
                <?php if (!empty($d['subtitle'])): ?>
                    <p><?= e($d['subtitle']) ?></p>
                <?php endif; ?>
                <form class="newsletter-form" method="POST" action="/newsletter/subscribe">
                    <input
                        type="email"
                        name="email"
                        class="newsletter-input"
                        placeholder="<?= e($d['placeholder'] ?? 'Enter your email') ?>"
                        required
                    >
                    <button type="submit" class="btn btn-primary">
                        <?= e($d['button_text'] ?? 'Subscribe') ?>
                    </button>
                </form>
            </div>
        </div>
    </section>
    <?php
    return ob_get_clean();
}