:root {
  --sn-dark: #0f172a;
  --sn-primary: #2866d3;
  --sn-primary-dark: #1b58aa;
  --sn-primary-deep: #071f4e;
  --sn-accent: #fbb040;
  --sn-muted: #64748b;
  --sn-border: #e2e8f0;
  --sn-panel: #ffffff;
  --sn-soft: #f5f7fb;
  --sn-header: #071f4e;
  --sn-header-text: #ffffff;
  --sn-sidebar: #0f172a;
  --sn-list-bg: #ebecf0;
  --sn-card-bg: #ffffff;
  --sn-radius: 8px;
  --sn-shadow: 0 1px 3px rgba(15, 23, 42, 0.12);
  --font-sans: "Segoe UI", system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
}

.board-bg-blue { background: linear-gradient(135deg, #2866d3, #1b58aa); }
.board-bg-navy { background: linear-gradient(135deg, #071f4e, #0f172a); }
.board-bg-orange { background: linear-gradient(135deg, #fbb040, #e8941f); }
.board-bg-green { background: linear-gradient(135deg, #22a06b, #1f845a); }
.board-bg-purple { background: linear-gradient(135deg, #6e5dc6, #5243aa); }
.board-bg-gray { background: linear-gradient(135deg, #64748b, #475569); }