:root,
html[data-theme="classic"] {
    /* Brand palette */
    --drd-color-brand-navy-900: #03173d;
    --drd-color-brand-navy-800: #0a2d5c;
    --drd-color-brand-navy-700: #0d3268;
    --drd-color-brand-navy-600: #325a95;
    --drd-color-brand-navy-500: #4a648a;
    --drd-color-brand-cyan-500: #6cb3db;
    --drd-color-brand-cyan-600: #5ca4cd;
    --drd-color-brand-teal-500: #3ba9b0;
    --drd-color-brand-coral-500: #f37361;
    --drd-color-brand-gold-500: #ffc107;
    --drd-color-brand-gold-400: #ffcd38;
    --drd-color-brand-orange-500: #ff9800;

    /* Neutral palette */
    --drd-color-neutral-0: #ffffff;
    --drd-color-neutral-50: #f8f9fa;
    --drd-color-neutral-100: #ecebeb;
    --drd-color-neutral-200: #dee2e6;
    --drd-color-neutral-300: #d9d9d9;
    --drd-color-neutral-400: #c3c3c3;
    --drd-color-neutral-500: #6c757d;
    --drd-color-neutral-900: #212529;

    /* Status palette */
    --drd-color-success: #28a745;
    --drd-color-success-strong: #26b050;
    --drd-color-warning: #ffc107;
    --drd-color-danger: #dc3545;
    --drd-color-info: #17a2b8;

    /* UI palette */
    --drd-color-link: #0071c1;
    --drd-color-primary-action: #1b6ec2;
    --drd-color-primary-action-border: #1861ac;

    /* Semantic surfaces and text */
    --drd-bg-app: var(--drd-color-brand-navy-700);
    --drd-surface-default: var(--drd-color-neutral-0);
    --drd-surface-muted: var(--drd-color-neutral-50);
    --drd-text-primary: var(--drd-color-neutral-900);
    --drd-text-muted: var(--drd-color-neutral-500);
    --drd-text-inverse: var(--drd-color-neutral-0);
    --drd-border-default: var(--drd-color-neutral-200);

    /* Semantic interactions and states */
    --drd-link: var(--drd-color-link);
    --drd-action-primary-bg: var(--drd-color-primary-action);
    --drd-action-primary-border: var(--drd-color-primary-action-border);
    --drd-action-primary-text: var(--drd-color-neutral-0);
    --drd-state-valid: var(--drd-color-success-strong);
    --drd-state-invalid: var(--drd-color-danger);
    --drd-state-highlight: #00ff00;

    /* Loading shell */
    --drd-loading-bg-start: var(--drd-color-brand-navy-900);
    --drd-loading-bg-end: var(--drd-color-brand-navy-800);
    --drd-loading-progress-track: rgba(255, 255, 255, 0.2);
    --drd-loading-progress-start: var(--drd-color-brand-gold-500);
    --drd-loading-progress-end: var(--drd-color-brand-orange-500);
    --drd-loading-status-text: rgba(255, 255, 255, 0.7);
    --drd-loading-offline-bg-start: #5c3d1a;
    --drd-loading-offline-bg-end: #8b5a2b;
}