:root {
    /* Dark theme colors, now permanent */
    --bg-color: #1a202c;
    --container-bg: #2d3748;
    --text-color-primary: #e2e8f0;
    --text-color-secondary: #a0aec0;
    --label-color: #cbd5e0;
    --input-border: #4a5568;
    --input-bg: #2d3748;
    --input-focus-border: #63b3ed;
    --button-primary-bg: #4299e1;
    --button-primary-text: #ffffff;
    --button-primary-hover-bg: #3182ce;
    --button-secondary-bg: #4a5568;
    --button-secondary-text: #e2e8f0;
    --button-secondary-hover-bg: #2d3748;
    --link-color: #63b3ed;
    --loader-color: #63b3ed;
    --loader-text-color: #cbd5e0;
    --error-color: #fc8181;
    --success-color: #68d391;
    --output-bg: #2d3748;
    --card-bg: #2d3748;
    --card-border: 1px solid #4a5568;
    --card-shadow: 0 6px 10px rgba(0, 0, 0, 0.2), 0 15px 30px rgba(0, 0, 0, 0.15);
}