:root{--bg: #edf7ee;--card: #ffffff;--border: #d7e9d8;--text: #33413a;--text-h: #14251b;--muted: #647268;--accent: #2f9e44;--accent-dark: #1f7a34;--green: #16a34a;--red: #dc2626;--blue: #2563eb;--yellow: #ca8a04;--infeasible-bg: #f3f6f2;--shadow: 0 1px 2px rgba(20, 37, 27, .06);--input-bg: #ffffff;--page-gradient: linear-gradient(160deg, #f2faf1 0%, #e6f5e8 45%, #d7edda 100%);--sans: system-ui, "Segoe UI", Roboto, sans-serif;font:13px/1.5 var(--sans);color:var(--text);background:var(--page-gradient);color-scheme:light}:root[data-theme=dark]{--bg: #1c1d1f;--card: #2b2c2f;--border: #414347;--text: #d6d8db;--text-h: #f5f6f7;--muted: #9aa0a6;--accent: #4caf50;--accent-dark: #6fcf73;--green: #4ade80;--red: #f87171;--blue: #60a5fa;--yellow: #fbbf24;--infeasible-bg: #232427;--shadow: 0 1px 3px rgba(0, 0, 0, .4);--input-bg: #333537;--page-gradient: 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