:root {
    --color-bg: #f8f9fa;
    --color-card-bg: #ffffff;
    --color-border: #dee2e6;
    --color-heading: #495057;
    --color-subheader: #6c757d;
    --radius-card: 8px;
    --padding-card: 24px 28px;
    --spacing-card: 20px;
    --form-check-icon: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 20 20'%3e%3cpath fill='none' stroke='%23fff' stroke-linecap='round' stroke-linejoin='round' stroke-width='3' d='m6 10 3 3 6-6'/%3e%3c%2fsvg%3e");
    --form-check-radius: 0.25em;
}

body {
    background-color: var(--color-bg);
}

.section-card {
    background: var(--color-card-bg);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-card);
    padding: var(--padding-card);
    margin-bottom: var(--spacing-card);
}

.section-card h2 {
    font-size: 1.1rem;
    font-weight: 700;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--color-heading);
    margin-bottom: 16px;
}

.subheader {
    font-size: 0.9rem;
    font-weight: 600;
    color: var(--color-subheader);
    margin-bottom: 10px;
    margin-top: 18px;
}

.subheader:first-of-type {
    margin-top: 0;
}

.form-check-input[type="checkbox"],
.form-check-input[type="radio"] {
    border-radius: var(--form-check-radius);
}

.form-check-input[type="checkbox"]:checked,
.form-check-input[type="radio"]:checked {
    background-image: var(--form-check-icon);
}

.selected-vars-box {
    min-height: 38px;
    border: 1px solid var(--color-border);
    border-radius: 0.375rem;
    padding: 6px;
    display: flex;
    flex-wrap: wrap;
    gap: 6px;
    align-content: flex-start;
}

.var-tag {
    display: inline-flex;
    align-items: center;
    gap: 5px;
    background: rgba(13, 110, 253, 0.08);
    color: #0a58ca;
    border: 1px solid rgba(13, 110, 253, 0.25);
    border-radius: 4px;
    padding: 3px 8px;
    font-size: 0.82rem;
    font-weight: 500;
}

.var-tag button {
    background: none;
    border: none;
    padding: 0;
    cursor: pointer;
    color: inherit;
    font-size: 0.85rem;
    line-height: 1;
    opacity: 0.6;
}

.var-tag button:hover {
    opacity: 1;
}

.info-icon {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 16px;
    height: 16px;
    font-size: 0.85rem;
    color: var(--color-subheader);
    cursor: default;
    position: relative;
}

.info-icon::after {
    content: attr(data-tooltip);
    position: absolute;
    left: 50%;
    top: calc(100% + 6px);
    transform: translateX(-50%);
    background: #333;
    color: #fff;
    font-size: 0.78rem;
    font-weight: 400;
    line-height: 1.4;
    padding: 8px 10px;
    border-radius: 5px;
    width: 260px;
    white-space: normal;
    pointer-events: none;
    opacity: 0;
    transition: opacity 0.15s ease;
    z-index: 10;
}

.info-icon:hover::after,
.info-icon:focus::after {
    opacity: 1;
}