:root {
    --bg-color: #f0f2f5;
    --text-color: #333333;
    --card-bg: #ffffff;
    --primary-color: #4a90e2;
    --accent-color: #f5a623;
    --shadow-color: rgba(0, 0, 0, 0.1);
    
    /* Lotto Ball Colors */
    --ball-1: #fbc400; /* 1-10 */
    --ball-11: #69c8f2; /* 11-20 */
    --ball-21: #ff7272; /* 21-30 */
    --ball-31: #aaaaaa; /* 31-40 */
    --ball-41: #b0d840; /* 41-45 */
}

body.dark-theme {
    --bg-color: #1a1a1a;
    --text-color: #f0f2f5;
    --card-bg: #2d2d2d;
    --primary-color: #64b5f6;
    --shadow-color: rgba(0, 0, 0, 0.5);
}

body {
    background-color: var(--bg-color);
    color: var(--text-color);
    font-family: 'Poppins', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
    margin: 0;
    transition: background-color 0.3s ease, color 0.3s ease;
}

.theme-toggle {
    position: fixed;
    top: 20px;
    right: 20px;
    background: var(--card-bg);
    border: 1px solid var(--primary-color);
    color: var(--primary-color);
    padding: 10px 15px;
    border-radius: 20px;
    cursor: pointer;
    font-weight: bold;
    box-shadow: 0 4px 6px var(--shadow-color);
    transition: all 0.3s ease;
}

.theme-toggle:hover {
    transform: scale(1.05);
}