:root {
            /* Light mode colors */
            --bg-gradient: linear-gradient(135deg, #0f172a 0%, #1e293b 100%);
            --container-bg: rgba(255, 255, 255, 0.95);
            --text-primary: #2c3e50;
            --text-secondary: #34495e;
            --text-muted: #ffffff;
            --accent-color: #0b3388;
            --border-color: #ddd;
            --quote-bg: linear-gradient(135deg, #f8f9fa, #e9ecef);
            --signature-bg: linear-gradient(135deg, #123275, #123d8e);
            --signature-text: rgba(255, 255, 255, 0.85);
            --highlight-bg: rgba(30, 64, 175, 0.1);
            --highlight-text: #0b348e;
            --header-bg: rgba(255, 255, 255, 0.1);
            --footer-bg: rgba(255, 255, 255, 0.05);
            
            /* Dark mode colors */
            --dark-bg-gradient: linear-gradient(135deg, #0f172a 0%, #1e293b 100%);
            --dark-container-bg: rgba(15, 23, 42, 0.95);
            --dark-text-primary: #e2e8f0;
            --dark-text-secondary: #cbd5e1;
            --dark-text-muted: #94a3b8;
            --dark-accent-color: #0b348e;
            --dark-border-color: #374151;
            --dark-quote-bg: linear-gradient(135deg, #1e293b, #334155);
            --dark-signature-bg: white;
            --dark-signature-text: rgba(15, 23, 42, 0.9);
            --dark-highlight-bg: rgba(212, 175, 55, 0.1);
            --dark-highlight-text: #d4af37;
            --dark-header-bg: rgba(15, 23, 42, 0.3);
            --dark-footer-bg: rgba(15, 23, 42, 0.2);
        }

        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }

        body {
            font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
            line-height: 1.7;
            color: var(--text-primary);
            background: var(--bg-gradient);
            min-height: 100vh;
            transition: all 0.3s ease;
        }

        body.dark-mode {
            color: var(--dark-text-primary);
            background: var(--dark-bg-gradient);
        }

        /* Header with logo and controls */
        .header {
            position: sticky;
            top: 0;
            z-index: 1000;
            background: var(--header-bg);
            backdrop-filter: blur(20px);
            transition: all 0.3s ease;
        }

        .header.header-detached {
            position: absolute;
            top: 0;
        }

        .dark-mode .header {
            background: var(--dark-header-bg);
            border-bottom-color: var(--dark-border-color);
        }

        .header-content {
            max-width: 1200px;
            margin: 0 auto;
            padding: 15px 20px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            gap: 20px;
        }

        .logo-section {
            display: flex;
            align-items: center;
            gap: 15px;
            flex: 1;
        }

        .logo-placeholder {
            width: 40px;
            height: 40px;
            background: var(--accent-color);
            border-radius: 8px;
            display: flex;
            align-items: center;
            justify-content: center;
            color: white;
            font-weight: bold;
            font-size: 18px;
            transition: all 0.3s ease;
        }

        .dark-mode .logo-placeholder {
            background: #d4af37;
            color: #0f172a;
        }

        .logo-text {
            font-size: 1.2rem;
            font-weight: 300;
            color: var(--text-primary);
            letter-spacing: 1px;
            transition: color 0.3s ease;
        }

        .dark-mode .logo-text {
            color: var(--dark-text-primary);
        }

        .header-controls {
            display: flex;
            align-items: center;
            gap: 30px;
        }

        .theme-toggle-wrapper {
            margin-left: auto;
        }

        /* Language selector */
        .language-selector {
            display: flex;
            background: rgba(255, 255, 255, 0.975);
            border-radius: 25px;
            padding: 5px;
            backdrop-filter: blur(10px);
            border: 1px solid var(--border-color);
            transition: all 0.3s ease;
        }

        .dark-mode .language-selector {
            background: rgba(255, 255, 255, 0.3);
            border-color: var(--dark-border-color);
        }

        .language-option {
            padding: 8px 16px;
            border-radius: 20px;
            background: transparent;
            border: none;
            color: var(--text-primary);
            cursor: pointer;
            font-size: 14px;
            font-weight: 500;
            transition: all 0.3s ease;
            text-decoration: none;
            display: inline-block;
        }

        .language-option.active {
            background: var(--accent-color);
            color: white;
            box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
        }

        .dark-mode .language-option.active {
            background: #d4af37;
            color: #0f172a;
        }

        .language-option:hover:not(.active) {
            background: rgba(255, 255, 255, 0.1);
            color: var(--text-primary);
        }

        .dark-mode .language-option:hover:not(.active) {
            background: rgba(212, 175, 55, 0.1);
            color: var(--dark-text-primary);
        }

        /* Theme toggle */
        .theme-toggle {
            background: transparent;
            border: 2px solid var(--accent-color);
            border-radius: 50%;
            width: 45px;
            height: 45px;
            color: var(--accent-color);
            cursor: pointer;
            font-size: 20px;
            transition: all 0.3s ease;
            display: flex;
            align-items: center;
            justify-content: center;
            box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
        }

        .dark-mode .theme-toggle {
            border-color: #d4af37;
            color: #d4af37;
        }

        .theme-toggle:hover {
            background: var(--accent-color);
            color: white;
            transform: scale(1.1);
            box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
        }

        .dark-mode .theme-toggle:hover {
            background: #d4af37;
            color: #0f172a;
        }

        /* Main container */
        .container {
            max-width: 800px;
            margin: 0 auto;
            padding: 40px 20px;
            background: var(--container-bg);
            backdrop-filter: blur(10px);
            box-shadow: 0 25px 50px rgba(0, 0, 0, 0.1);
            border-radius: 20px;
            margin-top: 40px;
            margin-bottom: 40px;
            transition: all 0.3s ease;
        }

        .dark-mode .container {
            background: var(--dark-container-bg);
            box-shadow: 0 25px 50px rgba(0, 0, 0, 0.4);
        }

        h1 {
            font-size: 3rem;
            font-weight: 200;
            text-align: center;
            margin-bottom: 60px;
            color: var(--text-primary);
            letter-spacing: -1px;
            transition: color 0.3s ease;
        }

        .dark-mode h1 {
            color: #f1c40f;
        }

        h2 {
            font-size: 1.8rem;
            font-weight: 300;
            margin: 50px 0 30px 0;
            color: var(--text-secondary);
            border-left: 4px solid var(--accent-color);
            padding-left: 20px;
            transition: all 0.3s ease;
        }

        .dark-mode h2 {
            color: var(--dark-text-secondary);
            border-left-color: #d4af37;
        }

        h3 {
            font-size: 1.3rem;
            font-weight: 400;
            margin: 40px 0 20px 0;
            color: var(--text-primary);
            transition: color 0.3s ease;
        }

        .dark-mode h3 {
            color: #f1c40f;
        }

        p {
            margin-bottom: 20px;
            font-size: 1.1rem;
            color: var(--text-secondary);
            transition: color 0.3s ease;
        }

        .dark-mode p {
            color: var(--dark-text-secondary);
        }

        em {
            color: var(--accent-color);
            font-style: italic;
            font-weight: 500;
            transition: color 0.3s ease;
        }

        .dark-mode em {
            color: #d4af37;
        }

        strong {
            color: var(--text-primary);
            font-weight: 600;
            transition: color 0.3s ease;
        }

        .dark-mode strong {
            color: #d4af37;
        }

        .quote {
            background: var(--quote-bg);
            border-left: 5px solid var(--accent-color);
            padding: 30px;
            margin: 40px 0;
            border-radius: 0 10px 10px 0;
            font-style: italic;
            font-size: 1.2rem;
            color: var(--text-muted);
            box-shadow: 0 10px 20px rgba(0, 0, 0, 0.05);
            transition: all 0.3s ease;
        }

        .dark-mode .quote {
            background: var(--dark-quote-bg);
            border-left-color: #d4af37;
            color: var(--dark-text-muted);
            box-shadow: 0 10px 20px rgba(0, 0, 0, 0.3);
        }

        .signature {
            text-align: center;
            margin: 60px 0 20px 0;
            padding: 40px;
            background: var(--signature-bg);
            color: white;
            border-radius: 15px;
            box-shadow: 0 15px 30px rgba(30, 64, 175, 0.3);
            transition: all 0.3s ease;
        }

        .dark-mode .signature {
            background: var(--dark-signature-bg);
            color: #0f172a;
            box-shadow: 0 15px 30px rgba(212, 175, 55, 0.3);
        }

        .signature * {
            color: white;
        }

        .signature p {
            color: var(--signature-text);
            font-size: 1rem;
            margin-bottom: 20px;
            transition: color 0.3s ease;
        }

        .dark-mode .signature p {
            color: rgba(15, 23, 42, 0.8);
        }

        .signature .name {
            font-size: 1.5rem;
            font-weight: 300;
            color: white;
            letter-spacing: 2px;
            transition: color 0.3s ease;
        }

        .dark-mode .signature .name {
            color: #0f172a;
        }

        .divider {
            height: 1px;
            background: linear-gradient(90deg, transparent, var(--border-color), transparent);
            margin: 50px 0;
            transition: background 0.3s ease;
        }

        .dark-mode .divider {
            background: linear-gradient(90deg, transparent, var(--dark-border-color), transparent);
        }

        .highlight {
            background: var(--highlight-bg);
            padding: 2px 8px;
            border-radius: 4px;
            color: var(--highlight-text);
            font-weight: 500;
            transition: all 0.3s ease;
        }

        .dark-mode .highlight {
            background: var(--dark-highlight-bg);
            color: var(--dark-highlight-text);
        }

        /* Footer */
        .footer {
            background: var(--footer-bg);
            backdrop-filter: blur(20px);
            border-top: 1px solid var(--border-color);
            padding: 30px 20px;
            text-align: center;
            margin-top: 60px;
            transition: all 0.3s ease;
        }

        .dark-mode .footer {
            background: var(--dark-footer-bg);
            border-top-color: var(--dark-border-color);
        }

        .footer-content {
            max-width: 800px;
            margin: 0 auto;
        }

        .copyright {
            color: var(--text-muted);
            font-size: 14px;
            margin-bottom: 10px;
            transition: color 0.3s ease;
        }

        .dark-mode .copyright {
          color: var(--text-muted);
        }

        .footer-tagline {
          color: var(--text-muted);
            font-size: 12px;
            font-style: italic;
            transition: color 0.3s ease;
        }

        .dark-mode .footer-tagline {
            color: var(--dark-text-secondary);
        }

        /* Mobile responsive */
        @media (max-width: 768px) {
            .header-content {
                flex-direction: column;
                gap: 15px;
                padding: 15px;
            }

            .logo-section {
                justify-content: center;
            }

            .header-controls {
                flex-direction: row;
                justify-content: space-between;
                width: 100%;
                align-items: center;
            }

            .language-selector {
                justify-content: center;
            }

            .theme-toggle-wrapper {
                margin-left: 0;
            }

            .container {
                margin: 20px;
                padding: 40px 25px;
                border-radius: 15px;
            }

            h1 {
                font-size: 2.2rem;
                margin-bottom: 40px;
            }

            h2 {
                font-size: 1.5rem;
                margin: 35px 0 20px 0;
            }

            p {
                font-size: 1rem;
            }

            .quote {
                padding: 20px;
                margin: 30px 0;
                font-size: 1.1rem;
            }

            .signature {
                padding: 30px 20px;
                margin: 40px 0 20px 0;
            }
        }

        @media (max-width: 480px) {
            .language-option {
                padding: 6px 12px;
                font-size: 12px;
            }

            .theme-toggle {
                width: 40px;
                height: 40px;
                font-size: 18px;
            }

            .logo-placeholder {
                width: 35px;
                height: 35px;
                font-size: 16px;
            }

            .logo-text {
                font-size: 1rem;
            }
        }


        /* --- Accordion Styles --- */

.accordion-trigger {
    background-color: #ecf0f1;
    color: #2c3e50;
    cursor: pointer;
    padding: 18px 20px;
    width: 100%;
    border: none;
    border-radius: 5px;
    text-align: left;
    outline: none;
    font-size: 1rem;
    transition: background-color 0.3s ease;
    margin-top: 10px;

    /* Flexbox for layout (h2 title and + icon) */
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.accordion-trigger:hover,
.accordion-trigger.active {
    background-color: #e0e6e8;
}

.accordion-icon {
    font-size: 1.5em; /* Makes the '+' bigger */
    font-weight: bold;
    color: #3498db;
    transition: transform 0.3s ease;
}

.accordion-trigger.active .accordion-icon {
    /* Kept for potential rotation animation if you prefer */
    /* transform: rotate(45deg); */ 
}

.accordion-panel {
    padding: 0 18px;
    background-color: white;
    max-height: 0; /* This is the key to the animation */
    overflow: hidden;
    transition: max-height 0.3s ease-out;
    border-bottom: 1px solid #ecf0f1;
    border-left: 1px solid #ecf0f1;
    border-right: 1px solid #ecf0f1;
    border-radius: 0 0 5px 5px;
}

/* Add padding back when the panel is open */
.accordion-panel.active-panel {
    padding: 18px 18px;
}


/* --- Reference Link Styles --- */

.ref-link {
    font-size: 0.75em;
    vertical-align: super;
    text-decoration: none;
    color: #3498db;
    font-weight: bold;
    padding: 0 2px;
}

.ref-link:hover {
    text-decoration: underline;
}

.reference-list {
    list-style-type: decimal;
    padding-left: 20px;
    font-size: 0.9em;
}

.reference-list li {
    margin-bottom: 10px;
}

.reference-list a {
    color: #3498db;
    text-decoration: none;
    /* Breaks long URLs */
    word-break: break-all;
}

.reference-list a:hover {
    text-decoration: underline;
}



/* --- Additions for Mobile-Friendly Navigation --- */

/* Style for the main <nav> container */
.main-nav {
    width: 100%;
    background-color: #f8f8f8; /* Light background for the nav */
    border-top: 1px solid #e7e7e7;
    border-bottom: 1px solid #e7e7e7;
}

/* Dark mode styles for nav */
body.dark-theme .main-nav {
    background-color: #333;
    border-color: #444;
}

.main-nav ul {
    display: flex;
    flex-direction: row;
    justify-content: center;
    list-style: none;
    margin: 0;
    padding: 0;
}

.main-nav li a {
    display: block;
    padding: 14px 20px;
    text-decoration: none;
    color: #555;
    font-weight: 500;
    transition: background-color 0.3s, color 0.3s;
}

.main-nav li a:hover {
    background-color: #e7e7e7;
    color: #000;
}

/* Active page link */
.main-nav li a.active {
    color: #3498db; /* Highlight color for active page */
    font-weight: 700;
    box-shadow: inset 0 -3px 0 0 #3498db;
}

/* Dark mode link styles */
body.dark-theme .main-nav li a {
    color: #ccc;
}
body.dark-theme .main-nav li a:hover {
    background-color: #444;
    color: #fff;
}
body.dark-theme .main-nav li a.active {
    color: #3498db; /* Keep highlight color */
}


/* Hamburger Toggle Button (Hidden on Desktop) */
.nav-toggle {
    display: none; /* Hide by default */
    background: none;
    border: none;
    cursor: pointer;
    padding: 10px;
    margin-left: 10px;
}

.hamburger-icon {
    display: block;
    width: 24px;
    height: 3px;
    background-color: #333;
    position: relative;
    transition: all 0.3s ease;
}
.hamburger-icon::before,
.hamburger-icon::after {
    content: '';
    position: absolute;
    width: 24px;
    height: 3px;
    background-color: #333;
    left: 0;
    transition: all 0.3s ease;
}
.hamburger-icon::before { top: -8px; }
.hamburger-icon::after { top: 8px; }

/* Dark mode hamburger */
body.dark-theme .hamburger-icon,
body.dark-theme .hamburger-icon::before,
body.dark-theme .hamburger-icon::after {
    background-color: #eee;
}

/* Hamburger "X" state */
.nav-toggle[aria-expanded="true"] .hamburger-icon {
    background-color: transparent; /* Center bar fades out */
}
.nav-toggle[aria-expanded="true"] .hamburger-icon::before {
    transform: rotate(45deg) translate(5px, 6px);
}
.nav-toggle[aria-expanded="true"] .hamburger-icon::after {
    transform: rotate(-45deg) translate(5px, -6px);
}


/* --- Mobile Styles --- */
@media (max-width: 768px) {
    .header-content {
        /* Ensure toggle is on the right */
        justify-content: space-between;
    }

    .header-controls {
        /* Move controls inside the collapsible menu */
        display: none; 
    }

    .nav-toggle {
        display: block; /* Show hamburger */
    }

    .main-nav {
        /* Hide nav by default */
        max-height: 0;
        overflow: hidden;
        transition: max-height 0.3s ease-out;
    }
    
    .main-nav.is-open {
        /* Show nav when .is-open is added by JS */
        max-height: 100vh; /* Allow it to grow as tall as needed */
        transition: max-height 0.3s ease-in;
    }

    .main-nav ul {
        flex-direction: column; /* Stack links vertically */
        align-items: center;
        padding: 10px 0;
    }

    .main-nav li {
        width: 100%;
        text-align: center;
    }

    .main-nav li a {
        padding: 16px 20px;
    }
    
    .main-nav li a.active {
        box-shadow: inset 4px 0 0 0 #3498db; /* Use a side-border for active link */
    }

}