:root {
    --background-color: #f0f2f5;
    --card-background-color: #ffffff;
    --text-color: #333;
    --primary-color: #007bff;
    --shadow-color: rgba(0, 0, 0, 0.1);
    --glow-color: rgba(0, 123, 255, 0.5);
}

[data-theme="dark"] {
    --background-color: #1a1a1a;
    --card-background-color: #2a2a2a;
    --text-color: #f0f2f5;
    --primary-color: #00aaff;
    --shadow-color: rgba(255, 255, 255, 0.1);
    --glow-color: rgba(0, 170, 255, 0.5);
}

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
    background-color: var(--background-color);
    color: var(--text-color);
    margin: 0;
    padding: 2rem;
    transition: background-color 0.3s, color 0.3s;
}

header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    margin-bottom: 2rem;
}

.logo {
    height: 50px;
}

h1 {
    font-size: 1.8rem;
    color: var(--primary-color);
}

main {
    max-width: 800px;
    margin: 0 auto;
}

/* Theme toggle switch */
.theme-switch-wrapper {
    display: flex;
    align-items: center;
}

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

.theme-switch input { display: none; }

.slider {
    background-color: #ccc;
    bottom: 0;
    cursor: pointer;
    left: 0;
    position: absolute;
    right: 0;
    top: 0;
    transition: .4s;
}

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

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

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

.slider.round {
    border-radius: 34px;
}

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