:root {
    /* Default Light Mode */
    --bg: #f4f4f4;
    --text: #121212;
    --card-bg: #ffffff;
    --accent: #f36b6b;
    --card-shadow: rgba(0,0,0,0.1);
}

/* 2. THE LOGIC: Change variables when checked */
#theme-switch:checked + .page-wrapper {
    --bg: #121212;
    --text: #f4f4f4;
    --card-bg: #1e1e1e;
    --card-shadow: rgba(0,0,0,0.5);
}

body {
    margin: 0;
    padding: 0;
    font-family: 'Inter', sans-serif;
    transition: 0.5s; /* Smooth color transition */
}

.page-wrapper {
    background-color: var(--bg);
    color: var(--text);
    min-height: 100vh;
    transition: background 0.4s, color 0.4s;
    padding: 20px;
}

/* 3. THE TOGGLE SWITCH UI */
nav {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: 800px;
    margin: 0 auto 50px;
}

.switch-label {
    width: 60px;
    height: 30px;
    background: #333;
    border-radius: 50px;
    position: relative;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: space-around;
    padding: 5px;
}

.ball {
    width: 26px;
    height: 26px;
    background: var(--accent);
    border-radius: 50%;
    position: absolute;
    left: 2px;
    transition: 0.3s cubic-bezier(1, 0, 0, 1);
}

/* Move the ball when checked */
#theme-switch:checked + .page-wrapper .ball {
    transform: translateX(30px);
}

/* 4. CONTENT STYLING */
.content {
    text-align: center;
    max-width: 600px;
    margin: 0 auto;
}

.logo span { color: var(--accent); }

.card {
    background: var(--card-bg);
    padding: 30px;
    border-radius: 20px;
    margin-top: 30px;
    box-shadow: 0 10px 30px var(--card-shadow);
    border: 1px solid var(--accent);
}