:root {
    --bg-color-light: #f0f2f5;
    --text-color-light: #333;
    --container-bg-light: white;
    --button-bg-light: #007bff;
    --button-hover-light: #0056b3;
    --button-active-light: #004a99;

    --bg-color-dark: #1a1a1a;
    --text-color-dark: #f0f2f5;
    --container-bg-dark: #2a2a2a;
    --button-bg-dark: #0056b3;
    --button-hover-dark: #007bff;
    --button-active-dark: #008cff;
}

body {
    font-family: 'Helvetica Neue', sans-serif;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    margin: 0;
    background-color: var(--bg-color-light);
    transition: background-color 0.3s, color 0.3s;
}

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

.container {
    text-align: center;
    background: var(--container-bg-light);
    padding: 40px;
    border-radius: 15px;
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1), 0 6px 6px rgba(0, 0, 0, 0.1);
    transition: transform 0.3s ease-in-out, background-color 0.3s;
}

body.dark-mode .container {
    background: var(--container-bg-dark);
}

.container:hover {
    transform: translateY(-10px);
}

h1 {
    margin-bottom: 30px;
    font-size: 2.5em;
    color: var(--text-color-light);
    text-shadow: 1px 1px 2px rgba(0,0,0,0.1);
}

body.dark-mode h1 {
    color: var(--text-color-dark);
}

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

.lotto-number {
    display: flex;
    justify-content: center;
    align-items: center;
    width: 60px;
    height: 60px;
    border-radius: 50%;
    font-size: 1.8em;
    font-weight: bold;
    color: white;
    box-shadow: 0 4px 8px rgba(0,0,0,0.2);
    transition: all 0.3s ease-in-out;
    transform: scale(0);
    animation: popIn 0.5s forwards;
}

@keyframes popIn {
    0% {
        transform: scale(0);
    }
    80% {
        transform: scale(1.1);
    }
    100% {
        transform: scale(1);
    }
}

#generate-btn {
    padding: 15px 30px;
    font-size: 1.2em;
    font-weight: bold;
    color: white;
    background-color: var(--button-bg-light);
    border: none;
    border-radius: 10px;
    cursor: pointer;
    transition: background-color 0.3s, transform 0.2s;
    box-shadow: 0 4px 8px rgba(0, 123, 255, 0.3);
}

body.dark-mode #generate-btn {
    background-color: var(--button-bg-dark);
}

#generate-btn:hover {
    background-color: var(--button-hover-light);
    transform: translateY(-2px);
}

body.dark-mode #generate-btn:hover {
    background-color: var(--button-hover-dark);
}

#generate-btn:active {
    transform: translateY(1px);
    background-color: var(--button-active-light);
}

body.dark-mode #generate-btn:active {
    background-color: var(--button-active-dark);
}

/* Theme Switch */
.theme-switch-container {
    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:focus + .slider {
    box-shadow: 0 0 1px #2196F3;
}

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