:root {
    --bs-body-bg: #ffffff;
    --bs-body-color: #212529;
    --card-border-color: #dee2e6;
    --input-border-color: #ced4da;
    --result-bg: #f8f9fa;
    --category-nav-bg: #ffffff;
}

[data-bs-theme="dark"] {
    --bs-body-bg: #212529;
    --bs-body-color: #f8f9fa;
    --card-border-color: #495057;
    --input-border-color: #495057;
    --result-bg: #343a40;
    --category-nav-bg: #343a40;
}

body {
    background-color: var(--bs-body-bg);
    color: var(--bs-body-color);
    transition: background-color 0.3s ease, color 0.3s ease;
}

.card {
    border-color: var(--card-border-color);
    transition: border-color 0.3s ease;
}

.form-control {
    border-color: var(--input-border-color);
    transition: border-color 0.3s ease;
    background-color: var(--bs-body-bg);
    color: var(--bs-body-color);
}

.form-control:focus {
    background-color: var(--bs-body-bg);
    color: var(--bs-body-color);
}

.result-container, .result-card {
    background-color: var(--result-bg);
    transition: background-color 0.3s ease;
}

.category-nav {
    background-color: var(--category-nav-bg);
    transition: background-color 0.3s ease;
}

.theme-toggle {
    position: fixed;
    bottom: 20px;
    right: 20px;
    z-index: 1000;
    width: 50px;
    height: 50px;
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
    transition: all 0.3s ease;
}

.theme-toggle:hover {
    transform: scale(1.1);
}