/* Default Light Mode */
:root {
    --bg-color: #f5f5f5;
    --text-color: #222;
    --header-bg: #ddd;
    --toggle-bg: #666;
    --toggle-fg: #fff;
}

/* Auto Dark Mode Based on OS Preference */
@media (prefers-color-scheme: dark) {
    :root {
        --bg-color: #1c1c1c;
        --text-color: #f5f5f5;
        --header-bg: #333;
        --toggle-bg: #888;
        --toggle-fg: #222;
    }
}

/* User Preference Overrides */
.dark-mode {
    --bg-color: #1c1c1c;
    --text-color: #f5f5f5;
    --header-bg: #333;
    --toggle-bg: #888;
    --toggle-fg: #222;
}

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

.container {
    text-align: center;
    padding: 20px;
    max-width: 600px;
}

header {
    background: var(--header-bg);
    padding: 10px;
    border-radius: 10px;
}

h1 {
    margin: 0;
    font-size: 2em;
}

.tagline {
    font-size: 1.2em;
    opacity: 0.8;
}

/* Dark Mode Toggle */
/* Smooth transition for the toggle's appearance */
.toggle-container {
    transition: opacity 0.5s ease;
    opacity: 0; /* Hidden by default */
    pointer-events: none; /* Prevents accidental interaction */
    position: fixed;
    bottom: 20px;
    right: 20px;
    background: rgba(0, 0, 0, 0.1);
    padding: 10px;
    border-radius: 10px;
}

.switch {
    position: relative;
    display: inline-block;
    width: 40px;
    height: 20px;
}

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

.slider {
    position: absolute;
    cursor: pointer;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: var(--toggle-bg);
    transition: 0.3s;
    border-radius: 34px;
}

.slider:before {
    position: absolute;
    content: "";
    height: 14px;
    width: 14px;
    left: 3px;
    bottom: 3px;
    background-color: var(--toggle-fg);
    transition: 0.3s;
    border-radius: 50%;
}

input:checked + .slider {
    background-color: var(--toggle-fg);
}

input:checked + .slider:before {
    transform: translateX(20px);
}