/* Core Variables (Light Mode Default with Royal Header) */
:root {
    --bg-color: #f4f7f6;
    --text-color: #333333;
    --card-bg: #ffffff;
    
    /* New Royal Theme Colors */
    --nav-bg: #0B1D3A; /* Deep Royal Blue */
    --nav-text: #F9E076; /* Radiant Gold */
    --accent: #D33F00; /* Saffron/Red for Buttons */
    --accent-hover: #A63200;
    
    --border-color: #dddddd;
    --shadow: 0 6px 12px rgba(0,0,0,0.08);
}

/* Dark Mode Overrides */
body.dark-mode {
    --bg-color: #071022; /* Darker Blue-Black */
    --text-color: #e0e0e0;
    --card-bg: #112240; /* Muted Navy */
    --nav-bg: #050d1a;
    --nav-text: #F9E076;
    --border-color: #233554;
    --shadow: 0 6px 12px rgba(0,0,0,0.4);
}

* { box-sizing: border-box; margin: 0; padding: 0; font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif; }
body { background-color: var(--bg-color); color: var(--text-color); line-height: 1.6; transition: background-color 0.3s, color 0.3s; }
.container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }

/* Navigation */
.navbar { background: linear-gradient(180deg, #0B1D3A 0%, #152B52 100%); border-bottom: 3px solid var(--nav-text); padding: 15px 0; }
.nav-container { display: flex; justify-content: space-between; align-items: center; max-width: 1200px; margin: 0 auto; padding: 0 20px; flex-wrap: wrap; }
.nav-links { display: flex; align-items: center; }
.nav-links a { color: #ffffff; text-decoration: none; margin-left: 20px; font-weight: 500; font-size: 1.1em; transition: 0.3s; }
.nav-links a:hover { color: var(--nav-text); }

/* Theme Toggle Button */
.theme-btn { background: transparent; border: 1px solid var(--nav-text); color: var(--nav-text); padding: 5px 15px; border-radius: 20px; cursor: pointer; margin-left: 20px; transition: 0.3s; }
.theme-btn:hover { background: var(--nav-text); color: var(--nav-bg); }

/* Logo Branding */
.brand-logo { display: flex; align-items: center; gap: 15px; text-decoration: none; }
.brand-logo img { width: 60px; height: 60px; border-radius: 50%; box-shadow: 0 0 10px rgba(249, 224, 118, 0.5); }
.brand-logo h2 { color: var(--nav-text); font-family: 'Georgia', serif; font-size: 1.8em; text-shadow: 1px 1px 3px rgba(0,0,0,0.5); }

/* Hero Banner */
.hero-banner { background: linear-gradient(rgba(11, 29, 58, 0.8), rgba(11, 29, 58, 0.9)), url('images/mandir_bg.jpg') center/cover; color: #fff; text-align: center; padding: 60px 20px; border-bottom: 5px solid var(--accent); margin-bottom: 30px; }
.hero-banner h1 { color: var(--nav-text); font-family: 'Georgia', serif; font-size: 2.5em; margin-bottom: 15px; text-shadow: 2px 2px 4px rgba(0,0,0,0.7); }
.hero-banner p { font-size: 1.2em; max-width: 800px; margin: 0 auto; color: #e0e0e0; }

/* Grid Layouts & Cards */
.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 20px; margin: 20px 0; }
.grid-3 { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 20px; margin: 20px 0; }
.grid-4 { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 15px; margin: 20px 0; }

.card { background-color: var(--card-bg); padding: 25px; border-radius: 10px; box-shadow: var(--shadow); border: 1px solid var(--border-color); transition: 0.3s; }
.card h3 { color: var(--nav-bg); margin-bottom: 15px; border-bottom: 2px solid var(--border-color); padding-bottom: 8px; font-family: 'Georgia', serif; }
body.dark-mode .card h3 { color: var(--nav-text); }
.card img { max-width: 100%; border-radius: 6px; display: block; }

/* Buttons */
.btn { display: inline-block; background: linear-gradient(180deg, var(--accent) 0%, var(--accent-hover) 100%); color: #fff; padding: 10px 20px; text-decoration: none; border-radius: 25px; font-weight: bold; border: 1px solid #902c00; box-shadow: 0 3px 6px rgba(0,0,0,0.2); }
.btn:hover { background: var(--accent-hover); color: #fff; }

.bengali-text { font-size: 1.2em; line-height: 1.8; }
.text-center { text-align: center; }

@media (max-width: 768px) {
    .nav-container { flex-direction: column; text-align: center; gap: 15px; }
    .nav-links { flex-wrap: wrap; justify-content: center; gap: 10px; }
    .nav-links a { margin: 0; }
    .brand-logo { flex-direction: column; gap: 5px; }
}