/* Theme variables */
:root {
    --bg-color: #f0f2f5;
    --container-bg: white;
    --text-color: #333;
    --h1-color: #333;
    --number-bg: #f8f9fa;
    --number-color: #555;
    --btn-bg: #007bff;
    --btn-hover-bg: #0056b3;
    --btn-shadow: rgba(0, 123, 255, 0.3);
    --btn-hover-shadow: rgba(0, 123, 255, 0.4);
}

.dark-theme {
    --bg-color: #2c2c2c;
    --container-bg: #3c3c3c;
    --text-color: #e0e0e0;
    --h1-color: #e0e0e0;
    --number-bg: #4a4a4a;
    --number-color: #f0f0f0;
    --btn-bg: #6200ea;
    --btn-hover-bg: #3700b3;
    --btn-shadow: rgba(98, 0, 234, 0.3);
    --btn-hover-shadow: rgba(98, 0, 234, 0.4);
}

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

.container {
    text-align: center;
    background: var(--container-bg);
    padding: 40px;
    border-radius: 15px;
    box-shadow: 0 10px 25px rgba(0, 0, 0, 0.1);
    animation: fadeIn 1s ease-in-out;
    transition: background 0.3s, box-shadow 0.3s;
    margin-top: 5rem;
    margin-bottom: 5rem;
}

/* Theme switch styles */
.theme-switch-wrapper {
    display: flex;
    justify-content: flex-end;
    margin-bottom: 20px;
    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;
    -webkit-transition: .4s;
    transition: .4s;
}

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

input:checked + .slider {
    background-color: #6200ea;
}

input:focus + .slider {
    box-shadow: 0 0 1px #6200ea;
}

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

/* Rounded sliders */
.slider.round {
    border-radius: 34px;
}

.slider.round:before {
    border-radius: 50%;
}

@keyframes fadeIn {
    from {
        opacity: 0;
        transform: translateY(-20px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

h1 {
    margin-bottom: 30px;
    font-size: 2.5em;
    color: var(--h1-color);
    text-shadow: 1px 1px 2px rgba(0,0,0,0.05);
    transition: color 0.3s;
}

#lotto-sets-container {
    margin-bottom: 40px;
}

.lotto-numbers {
    display: flex;
    justify-content: center;
    margin-bottom: 20px;
}

.number {
    display: flex;
    justify-content: center;
    align-items: center;
    width: 60px;
    height: 60px;
    margin: 0 10px;
    border-radius: 50%;
    background-color: var(--number-bg);
    font-size: 1.8em;
    font-weight: bold;
    color: var(--number-color);
    box-shadow: 0 4px 8px rgba(0,0,0,0.08);
    transition: all 0.3s ease;
}

#generate-btn {
    padding: 15px 30px;
    border: none;
    border-radius: 10px;
    background-color: var(--btn-bg);
    color: white;
    font-size: 1.2em;
    cursor: pointer;
    transition: background-color 0.3s, box-shadow 0.3s, transform 0.3s;
    box-shadow: 0 4px 12px var(--btn-shadow);
}

#generate-btn:hover {
    background-color: var(--btn-hover-bg);
    box-shadow: 0 6px 16px var(--btn-hover-shadow);
    transform: translateY(-2px);
}

#generate-btn:active {
    transform: translateY(0);
    box-shadow: 0 4px 12px var(--btn-shadow);
}

@media (max-width: 600px) {
    .container {
        padding: 20px;
    }

    h1 {
        font-size: 2em;
    }

    .lotto-numbers {
        flex-wrap: wrap;
    }

    .number {
        width: 50px;
        height: 50px;
        font-size: 1.5em;
        margin: 5px;
    }

    #generate-btn {
        width: 100%;
        padding: 12px;
    }
}