:root {
    --bg-color-light: #f0f2f5;
    --text-color-light: #333;
    --card-bg-light: #ffffff;
    --primary-color-light: #4CAF50;
    --primary-color-dark-light: #45a049;
    --number-bg-light: #ffeb3b;
    --number-color-light: #333;
    --shadow-color-light: rgba(0, 0, 0, 0.1);

    --bg-color-dark: #1a1a1a;
    --text-color-dark: #f0f2f5;
    --card-bg-dark: #2a2a2a;
    --primary-color-dark: #66bb6a;
    --primary-color-dark-dark: #5a9f5d;
    --number-bg-dark: #fbc02d;
    --number-color-dark: #1a1a1a;
    --shadow-color-dark: rgba(255, 255, 255, 0.1);

    --background-color: var(--bg-color-light);
    --text-color: var(--text-color-light);
    --card-bg: var(--card-bg-light);
    --primary-color: var(--primary-color-light);
    --primary-color-darker: var(--primary-color-dark-light);
    --number-bg: var(--number-bg-light);
    --number-color: var(--number-color-light);
    --shadow-color: var(--shadow-color-light);
}

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

body.dark-mode {
    --background-color: var(--bg-color-dark);
    --text-color: var(--text-color-dark);
    --card-bg: var(--card-bg-dark);
    --primary-color: var(--primary-color-dark);
    --primary-color-darker: var(--primary-color-dark-dark);
    --number-bg: var(--number-bg-dark);
    --number-color: var(--number-color-dark);
    --shadow-color: var(--shadow-color-dark);
}

header {
    width: 100%;
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem 2rem;
    position: absolute;
    top: 0;
    box-sizing: border-box;
}

h1 {
    margin: 0;
    font-size: 1.5rem;
    text-shadow: 1px 1px 2px var(--shadow-color);
}

.theme-switcher {
    display: flex;
    align-items: center;
}

.theme-switcher label {
    margin-right: 0.5rem;
    font-size: 0.9rem;
}

#theme-toggle {
    opacity: 0;
    width: 0;
    height: 0;
}

#theme-toggle + label {
    position: relative;
    display: inline-block;
    width: 40px;
    height: 24px;
    cursor: pointer;
}

#theme-toggle + label:before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background-color: #ccc;
    border-radius: 12px;
    transition: background-color 0.3s;
}

#theme-toggle + label:after {
    content: '';
    position: absolute;
    top: 2px;
    left: 2px;
    width: 20px;
    height: 20px;
    background-color: white;
    border-radius: 50%;
    transition: transform 0.3s;
}

#theme-toggle:checked + label:before {
    background-color: var(--primary-color);
}

#theme-toggle:checked + label:after {
    transform: translateX(16px);
}
/* We need to rename the label for the theme toggle */
.theme-switcher label[for="theme-toggle"] {
    cursor: pointer;
}


lotto-generator {
    background: var(--card-bg);
    padding: 2rem 3rem;
    border-radius: 15px;
    box-shadow: 0 10px 30px var(--shadow-color);
    transition: background-color 0.3s;
}

lotto-generator .numbers {
    display: flex;
    gap: 1rem;
    margin-bottom: 2.5rem;
}

lotto-generator .number {
    width: 55px;
    height: 55px;
    border-radius: 50%;
    background: linear-gradient(145deg, var(--number-bg), #e6cf33);
    color: var(--number-color);
    display: flex;
    justify-content: center;
    align-items: center;
    font-size: 1.75rem;
    font-weight: bold;
    box-shadow: 0 5px 10px var(--shadow-color);
    animation: number-pop-in 0.5s cubic-bezier(0.68, -0.55, 0.27, 1.55) forwards;
    transform: scale(0);
}

@keyframes number-pop-in {
    to {
        transform: scale(1);
    }
}

lotto-generator button {
    width: 100%;
    padding: 1rem 2rem;
    border: none;
    border-radius: 8px;
    background-color: var(--primary-color);
    color: white;
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: background-color 0.3s, transform 0.1s;
    box-shadow: 0 4px 15px var(--shadow-color);
}

lotto-generator button:hover {
    background-color: var(--primary-color-darker);
    transform: translateY(-2px);
}

lotto-generator button:active {
    transform: translateY(0);
}

@media (max-width: 600px) {
    header {
        padding: 1rem;
        flex-direction: column;
        gap: 1rem;
    }
    h1 {
        font-size: 1.2rem;
    }
    lotto-generator {
        padding: 1.5rem;
    }
    lotto-generator .numbers {
        flex-wrap: wrap;
        justify-content: center;
        gap: 0.5rem;
    }

    lotto-generator .number {
        width: 50px;
        height: 50px;
        font-size: 1.5rem;
        margin: 0.25rem;
    }
}