:root{--bg:#0b0f14;--panel:#10161eeb;--line:#78aadc2e;--accent:#3fa9ff;--accent2:#40ffc8;--text:#d8e4ee;--dim:#7d8fa0;--warn:#ff6a50;--side:300px}*{box-sizing:border-box}html,body{background:var(--bg);height:100%;color:var(--text);-webkit-user-select:none;user-select:none;margin:0;font-family:-apple-system,SF Pro Display,Segoe UI,Inter,system-ui,sans-serif;overflow:hidden}button{font:inherit;color:inherit;cursor:pointer}#app{display:flex;position:fixed;inset:0}#viewport{cursor:default;flex:1;position:relative;overflow:hidden}#viewport>canvas:first-child{display:block}#overlay{pointer-events:none;position:absolute;inset:0}body[data-mode=attackMove] #viewport{cursor:crosshair}body[data-mode=place] #viewport{cursor:cell}#topbar{gap:6px;display:flex;position:absolute;top:10px;left:10px}#topbar button{border:1px solid var(--line);background:var(--panel);-webkit-backdrop-filter:blur(6px);backdrop-filter:blur(6px);border-radius:8px;width:34px;height:34px}#topbar 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