body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    position: relative;
}

.container {
    max-width: 400px;
    margin: 0 auto;
    text-align: center;
    padding: 20px;
}

input, button {
    padding: 10px;
    margin: 5px;
    font-size: 1rem;
    display: block; /* Make elements block-level to stack vertically */
    width: 100px;
    margin-left: auto;
    margin-right: auto;
}

#result {
    margin-top: 20px;
    font-size: 1.4rem; 
    min-height: 60px; /* added height to avoid shifting */
}

.theme-toggle-container {
    position: absolute;
    top: 20px;
    right: 20px;
}

.switch {
    position: relative;
    display: inline-block;
    width: 60px;
    height: 34px;
}

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

.red-text {
    color: red;
    font-weight: bold;
}

.light-text {
    color: black;
}

.dark-text {
    color: white;
}

body.light-mode {
    background-color: white;
    color: black;
}

body.light-mode .dark-text {
    color: black;
}

body.dark-mode {
    background-color: #333;
    color: white;
}

body.dark-mode .light-text {
    color: white;
}

.logo {
    width: 100%;
    height: auto;
}