:root{--bg: #15191e;--panel: #1e242b;--panel-2: #262d35;--line: #353e48;--fg: #e6e8eb;--muted: #9aa4ae;--accent: #d9b44a;--axis: #e8463c;--allies: #3b86e8;--sea: #5d7a8c;--chart-fg: #c8ced4;--chart-grid: rgba(255, 255, 255, .1);color-scheme:dark}*{box-sizing:border-box}html,body{margin:0;height:100%}body{background:var(--bg);color:var(--fg);font:13px/1.45 system-ui,Hiragino Sans,Yu Gothic UI,Meiryo,sans-serif}#app{height:100%}h2{font-size:12px;font-weight:600;color:var(--muted);margin:0 0 8px;letter-spacing:.04em}.btn{font:inherit;background:var(--panel-2);color:var(--fg);border:1px solid var(--line);border-radius:6px;padding:5px 14px;cursor:pointer;min-width:84px}.btn:hover:not(:disabled){border-color:var(--muted)}.btn.active{background:var(--accent);color:#111;border-color:var(--accent)}.btn:disabled{opacity:.5;cursor:default}.observe{display:flex;flex-direction:column;height:100%}.topbar{display:flex;align-items:center;gap:24px;padding:8px 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