:root{--bg: #0b0b10;--bg-sidebar: #0e0e14;--surface: #14141c;--surface-raised:#1a1a24;--border: #24242f;--border-strong: #33333f;--grid-lattice: #26262e;--grid-frame: #e8e8f0;--text: #dcdce6;--text-muted: #7b7d90;--text-dim: #55576a;--accent: #4b6bfb;--accent-soft: rgba(75, 107, 251, .14);--correct: #2f9e44;--wrong: #c2255c;--warning: #e8963c;--radius: 10px;--radius-sm: 7px;--font: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;--font-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace}*{box-sizing:border-box}html,body,#root{height:100%}body{margin:0;background:var(--bg);color:var(--text);font-family:var(--font);font-size:14px;-webkit-font-smoothing:antialiased}button{font-family:inherit}.arc-grid{display:inline-grid;gap:1px;padding:3px;background:var(--grid-lattice);border:2px solid 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