:root {
    --bni-red: #CF2030;
    --bni-dark-grey: #64666A;
    --bni-light-grey: #C8C8C8;
    
    /* Light Mode (Default) */
    --bg-color: #f8f9fa;
    --card-bg: #ffffff;
    --text-main: #212529;
    --text-muted: #6c757d;
    --border-color: #dee2e6;
    --input-bg: #ffffff;
}

[data-theme="dark"] {
    --bg-color: #0a0a0a;
    --card-bg: #161616;
    --text-main: #ffffff;
    --text-muted: #999999;
    --border-color: #333333;
    --input-bg: #0a0a0a;
}

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

body {
    font-family: 'Helvetica Neue', Arial, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-main);
    transition: background-color 0.3s, color 0.3s;
}

.logo { font-size: 2.5rem; font-weight: 800; }
.logo span { color: var(--bni-red); }

.btn-primary {
    background-color: var(--bni-red);
    color: white;
    border: none;
    padding: 0.8rem 1.5rem;
    border-radius: 6px;
    font-weight: 600;
    cursor: pointer;
    transition: opacity 0.2s;
}

.btn-primary:hover { opacity: 0.9; }

/* Theme Toggle Button */
#theme-toggle {
    position: fixed;
    top: 1.5rem;
    right: 1.5rem;
    background: var(--card-bg);
    border: 1px solid var(--border-color);
    color: var(--text-main);
    padding: 0.5rem 1rem;
    border-radius: 20px;
    cursor: pointer;
    font-size: 0.8rem;
    z-index: 1000;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}