: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);
}

/* Mobile-friendly enhancements */
body.is-mobile .container {
    padding-left: 12px;
    padding-right: 12px;
}

body.is-mobile .camera-container {
    max-width: 100%;
}

body.is-mobile .theme-toggle {
    bottom: 12px;
    right: 12px;
    width: 46px;
    height: 46px;
}

body.is-mobile .d-grid .btn {
    padding: 12px 16px;
    font-size: 1rem;
    border-radius: 10px;
}

/* Bottom sheet style for results on mobile */
body.is-mobile #resultContainer {
    position: fixed;
    left: 0;
    right: 0;
    bottom: 0;
    max-height: 60vh;
    overflow-y: auto;
    border-top-left-radius: 16px;
    border-top-right-radius: 16px;
    box-shadow: 0 -6px 20px rgba(0,0,0,0.15);
}

body.is-mobile .card,
body.is-mobile .alert {
    border-radius: 14px;
}