:root {
    --bg-color: #fafafa;
    --text-color: #333;
    --container-bg: rgba(255, 255, 255, 0.8);
    --lotto-number-bg: #eee;
    --button-bg: #8e2de2;
    --button-hover-bg: #4a00e0;
    --button-shadow: rgba(142, 45, 226, 0.7);
    --button-hover-shadow: rgba(74, 0, 224, 1);
    --bg-pattern: #ddd;
}

body.dark-mode {
    --bg-color: #1a1a1a;
    --text-color: #fff;
    --container-bg: rgba(0, 0, 0, 0.6);
    --lotto-number-bg: #333;
    --button-bg: #4a00e0;
    --button-hover-bg: #8e2de2;
    --button-shadow: rgba(74, 0, 224, 0.7);
    --button-hover-shadow: rgba(142, 45, 226, 1);
    --bg-pattern: #333;
}

body {
    font-family: 'Helvetica Neue', sans-serif;
    background: var(--bg-color);
    color: var(--text-color);
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    margin: 0;
    background-image: linear-gradient(45deg, var(--bg-pattern) 25%, transparent 25%),
                      linear-gradient(-45deg, var(--bg-pattern) 25%, transparent 25%),
                      linear-gradient(45deg, transparent 75%, var(--bg-pattern) 75%),
                      linear-gradient(-45deg, transparent 75%, var(--bg-pattern) 75%);
    background-size: 20px 20px;
    transition: background-color 0.3s ease, color 0.3s ease;
}

.container {
    text-align: center;
    padding: 40px;
    border-radius: 15px;
    background: var(--container-bg);
    backdrop-filter: blur(10px);
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
}

h1 {
    font-size: 3em;
    margin-bottom: 20px;
    text-shadow: 0 0 10px rgba(255, 255, 255, 0.3);
}

.lotto-display {
    display: flex;
    justify-content: center;
    gap: 15px;
    margin-bottom: 30px;
}

.lotto-number {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    background: var(--lotto-number-bg);
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 1.5em;
    font-weight: bold;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.4);
    transition: transform 0.3s ease, background-color 0.3s ease;
}

#generate-btn {
    padding: 15px 30px;
    font-size: 1.2em;
    font-weight: bold;
    color: #fff;
    background: var(--button-bg);
    border: none;
    border-radius: 10px;
    cursor: pointer;
    transition: background 0.3s ease, box-shadow 0.3s ease;
    box-shadow: 0 0 15px var(--button-shadow);
}

#generate-btn:hover {
    background: var(--button-hover-bg);
    box-shadow: 0 0 25px var(--button-hover-shadow);
}

/* Theme Switcher Styles */
.theme-switch-wrapper {
    position: absolute;
    top: 20px;
    right: 20px;
}

.theme-switch {
    position: relative;
    display: inline-block;
    width: 60px;
    height: 34px;
}

.theme-switch input {
    opacity: 0;
    width: 0;
    height: 0;
}

.slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: #ccc;
    transition: .4s;
    border-radius: 34px;
}

.slider:before {
    position: absolute;
    content: "";
    height: 26px;
    width: 26px;
    left: 4px;
    bottom: 4px;
    background-color: white;
    transition: .4s;
    border-radius: 50%;
}

input:checked + .slider {
    background-color: #2196F3;
}

input:checked + .slider:before {
    transform: translateX(26px);
}