:root{--col-width: 390px;--col-width-desktop: 480px;--board-col-width-desktop: 940px;--tray-col-width-desktop: 240px;--breakpoint-desktop: 768px;--grid-cell: 40px;--font-stack: system-ui, -apple-system, sans-serif;--bg: #f8f9fa;--bg-grid: rgba(15, 23, 42, .04);--card: #ffffff;--card-dark: #1e293b;--border: #e2e8f0;--border-soft: #edf0f3;--text: #0f172a;--muted: #64748b;--subtle: #94a3b8;--on-brand: #ffffff;--brand: #8b5cf6;--brand-deep: #6d28d9;--brand-ink: #4c1d95;--brand-lift: #a855f7;--brand-grad: linear-gradient(140deg, #8b5cf6 0%, #6d28d9 52%, #4c1d95 100%);--brand-tile: linear-gradient(135deg, #a855f7 0%, #8b5cf6 52%, #6d28d9 100%);--brand-halo: radial-gradient(85% 100% at 50% 0%, rgba(139, 92, 246, .09) 0%, transparent 100%);--red: #e1463c;--red-grad: linear-gradient(140deg, #e1574b 0%, #c0392b 100%);--red-zone: radial-gradient(75% 100% at 50% 0%, rgba(225, 70, 60, .1) 0%, transparent 70%);--blue: #327deb;--blue-grad: linear-gradient(140deg, #3c5a8c 0%, #24406e 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