[data-theme=dark] {
    --primary-color: #ffffff;
    --background-color: #121212;
    --card-background: #1e1e1e;
    --text-color: #e0e0e0;
    --border-color: #333333;
    --link-color: #4a9eff;
    --link-hover-color: #6bb1ff;
    --transition-duration: 0.3s;
}

[data-theme=dark] body {
    background-color: var(--background-color) !important;
    color: var(--text-color) !important;
    transition: background-color var(--transition-duration) ease;
}

[data-theme=dark] .card {
    background-color: var(--card-background) !important;
    border-color: var(--border-color) !important;
    transition: transform var(--transition-duration) ease, box-shadow var(--transition-duration) ease;
}

[data-theme=dark] .card:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
}

[data-theme=dark] .jumbotron {
    background-color: var(--card-background) !important;
    color: var(--text-color) !important;
    background-image: none !important;
    transition: all var(--transition-duration) ease;
}

[data-theme=dark] .jumbotron::before {
    background-color: transparent !important;
}

[data-theme=dark] hr {
    border-top-color: var(--border-color) !important;
    transition: border-color var(--transition-duration) ease;
}

[data-theme=dark] a {
    color: var(--link-color) !important;
    text-decoration: none !important;
    transition: color var(--transition-duration) ease;
    position: relative;
}

[data-theme=dark] a:hover {
    color: var(--link-hover-color) !important;
}

[data-theme=dark] a::after {
    content: '';
    position: absolute;
    width: 0;
    height: 2px;
    bottom: 0;
    left: 0;
    background-color: var(--link-hover-color);
    transition: width var(--transition-duration) ease;
}

[data-theme=dark] a:hover::after {
    width: 100%;
}

[data-theme=dark] .ico {
    color: var(--link-color) !important;
    border-color: var(--link-color) !important;
    transition: all var(--transition-duration) ease;
}

[data-theme=dark] .ico:hover {
    background-color: var(--link-color) !important;
    color: var(--background-color) !important;
    transform: scale(1.1) rotate(5deg);
}

[data-theme=dark] .text-secondary {
    color: var(--text-color) !important;
}

[data-theme=dark] .piece.output {
    background-color: var(--background-color) !important;
}

[data-theme=dark] h1, [data-theme=dark] h2, [data-theme=dark] h3, [data-theme=dark] h4, [data-theme=dark] h5, [data-theme=dark] h6 {
    transition: color var(--transition-duration) ease;
}

[data-theme=dark] .card-title {
    position: relative;
    display: inline-block;
}

[data-theme=dark] .card-title::after {
    content: '';
    position: absolute;
    width: 0;
    height: 2px;
    bottom: 0;
    left: 0;
    background-color: var(--link-color);
    transition: width var(--transition-duration) ease;
}

[data-theme=dark] .card:hover .card-title::after {
    width: 100%;
}

::selection {
    background-color: var(--link-color);
    color: var(--background-color);
}