:root {
    --background-color: #f0f2f5;
    --container-bg: #ffffff;
    --text-color: #333;
    --accent-color: #4a90e2;
    --shadow-color: rgba(0, 0, 0, 0.1);
    --glow-color: rgba(74, 144, 226, 0.5);

    --ball-color-1: #fbe4e4; /* 1-10 */
    --ball-color-2: #e4f5fb; /* 11-20 */
    --ball-color-3: #fff6e4; /* 21-30 */
    --ball-color-4: #e4fbe4; /* 31-40 */
    --ball-color-5: #f2e4fb; /* 41-45 */
}

[data-theme="dark"] {
    --background-color: #1a1a2e;
    --container-bg: #16213e;
    --text-color: #eaeaea;
    --accent-color: #64b5f6;
    --shadow-color: rgba(0, 0, 0, 0.3);
    --glow-color: rgba(100, 181, 246, 0.7);

    --ball-color-1: #533535; /* 1-10 */
    --ball-color-2: #354253; /* 11-20 */
    --ball-color-3: #534f35; /* 21-30 */
    --ball-color-4: #355335; /* 31-40 */
    --ball-color-5: #483553; /* 41-45 */
}

body {
    font-family: 'Helvetica Neue', Arial, sans-serif;
    background-color: var(--background-color);
    color: var(--text-color);
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    margin: 0;
    background-image: radial-gradient(circle, rgba(0,0,0,0.02) 5%, transparent 5%);
    background-size: 20px 20px;
}

.container {
    text-align: center;
    background-color: var(--container-bg);
    padding: 40px;
    border-radius: 20px;
    box-shadow: 0 10px 20px var(--shadow-color), 0 6px 6px var(--shadow-color);
}

h1 {
    font-size: 2.5rem;
    margin-bottom: 30px;
    color: var(--accent-color);
}

.lotto-numbers {
    display: flex;
    justify-content: center;
    gap: 15px;
    margin-bottom: 40px;
}

.lotto-ball {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--text-color);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
}

#generate-btn {
    background-color: var(--accent-color);
    color: white;
    border: none;
    padding: 15px 30px;
    font-size: 1.2rem;
    border-radius: 10px;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 4px 15px var(--glow-color);
}

#generate-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px var(--glow-color);
}

#theme-toggle {
    position: fixed;
    top: 20px;
    right: 20px;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    border: none;
    background-color: var(--container-bg);
    box-shadow: 0 4px 8px var(--shadow-color);
    font-size: 1.5rem;
    cursor: pointer;
    transition: all 0.3s ease;
    z-index: 1000;
}

#theme-toggle:hover {
    transform: scale(1.1);
    box-shadow: 0 6px 12px var(--shadow-color);
}