:root {
    --bg-color: #ffffff;
    --text-color: #000000;
    --link-color: #0056b3;
    --header-bg: #f8f9fa;
    --border-color: #dddddd;
}

html.dark-mode {
    --bg-color: #121212;
    --text-color: #ffffff;
    --link-color: #66b0ff;
    --header-bg: #1e1e1e;
    --border-color: #333333;
}

body {
    background-color: var(--bg-color);
    color: var(--text-color);
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    line-height: 1.6;
}

/* Header & Nav */
.sticky-header-container { position: sticky; top: 0; z-index: 1000; }
.site-header { background: var(--header-bg); padding: 10px 20px; border-bottom: 1px solid var(--border-color); display: flex; justify-content: center; }
.site-header-content { display: flex; align-items: center; justify-content: space-between; width: 100%; max-width: 1200px; }
.menu-list { list-style: none; display: flex; gap: 15px; padding: 0; margin: 0; }
.menu-list li a { text-decoration: none; color: var(--text-color); font-weight: bold; }

/* Utilities */
.visually-hidden { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0,0,0,0); border: 0; }
.btn { padding: 8px 16px; background: var(--link-color); color: white; text-decoration: none; border-radius: 4px; display: inline-block; }
.post-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(250px, 1fr)); gap: 20px; padding: 20px 0; }
.post-card { border: 1px solid var(--border-color); padding: 10px; border-radius: 8px; }
.post-card img { max-width: 100%; height: auto; }
.map { height: 200px; width: 100%; background: #eee; margin-top: 10px; }

/* Footer */
.footer-container { background: var(--header-bg); padding: 20px; text-align: center; border-top: 1px solid var(--border-color); margin-top: 40px; }
.footer-nav ul { list-style: none; padding: 0; display: flex; justify-content: center; gap: 20px; }
.footer-nav a { color: var(--text-color); text-decoration: none; }

/* Mobile & Search Overlays */
.mobile-menu-overlay, .search-overlay { display: none; position: fixed; top: 0; left: 0; width: 100%; height: 100%; background: var(--bg-color); z-index: 2000; padding: 20px; }
.search-overlay.active, .mobile-menu-overlay.active { display: block; }

/* Theme Toggle Button */
.theme-toggle { cursor: pointer; width: 24px; height: 24px; background: var(--text-color); border-radius: 50%; display: inline-block; margin-left: 10px; }