:root{--bg: #0d1117;--panel: #161d27;--line: #28323f;--ink: #eaf0f7;--dim: #8a99ad;--accent: #f6a623}*{box-sizing:border-box}html,body{margin:0;height:100%}body{background:radial-gradient(900px 560px at 50% -8%,#1a212c,var(--bg));color:var(--ink);font-family:system-ui,-apple-system,Segoe UI,sans-serif;display:flex;justify-content:center;-webkit-user-select:none;user-select:none}#app{width:100%;max-width:540px;padding:12px 12px 26px}header{text-align:center;margin-bottom:6px}h1{margin:0;font-size:28px;letter-spacing:4px;font-weight:800;color:var(--accent)}.sub{margin:2px 0 0;color:var(--dim);font-size:13px}.bar{display:flex;gap:8px;justify-content:center;flex-wrap:wrap;align-items:center;margin:9px 0}.seg{display:inline-flex;background:var(--panel);border:1px solid var(--line);border-radius:999px;overflow:hidden}.seg button{background:none;border:none;color:var(--dim);padding:6px 13px;font:600 13px system-ui;cursor:pointer}.seg button.active{background:var(--accent);color:#1b130a}.btn{background:var(--panel);border:1px solid var(--line);color:var(--ink);padding:8px 16px;border-radius:999px;font:700 14px system-ui;cursor:pointer}.btn:hover:not(:disabled){border-color:var(--accent)}.btn:disabled{opacity:.4;cursor:default}.btn.primary{background:var(--accent);color:#1b130a;border-color:var(--accent)}.hud{display:flex;gap:8px;justify-content:center;flex-wrap:wrap;margin:8px 0}.stat{background:var(--panel);border:1px solid var(--line);border-radius:10px;padding:5px 12px;text-align:center;min-width:64px}.stat .lbl{display:block;color:var(--dim);font-size:11px;text-transform:uppercase;letter-spacing:.5px}.stat .num{display:block;font-weight:800;font-size:16px;font-variant-numeric:tabular-nums}.board{display:flex;justify-content:center;margin:10px 0}canvas{background:#0f151d;border:1px solid var(--line);border-radius:10px;image-rendering:auto;max-width:100%;touch-action:manipulation;cursor:pointer}.tools{display:flex;gap:6px;justify-content:center;flex-wrap:wrap;margin:8px 0}.tool{background:var(--panel);border:1px solid var(--line);color:var(--ink);padding:6px 11px;border-radius:8px;font:600 13px system-ui;cursor:pointer}.tool small{color:var(--dim);font-weight:700}.tool.on{border-color:var(--accent);background:#2a2415;color:var(--accent)}.tool.on small{color:var(--accent)}.tool.poor{opacity:.45}.actions{display:flex;gap:10px;justify-content:center;align-items:center;margin:6px 0;flex-wrap:wrap}.hint{color:var(--dim);font-size:12px}.legend{display:flex;gap:14px;justify-content:center;color:var(--dim);font-size:12px;margin-top:8px}.legend .reach-key:before{content:"▢";color:#26303d;margin-right:3px}.overlay{position:fixed;inset:0;display:flex;align-items:center;justify-content:center;background:#06090ecc;backdrop-filter:blur(3px)}.overlay.hidden{display:none}.modal{background:var(--panel);border:1px solid var(--line);border-radius:16px;padding:22px 26px;text-align:center;max-width:340px}.modal h2{margin:0 0 6px;font-size:24px;color:var(--accent)}.modal .big{font-size:44px;font-weight:800;color:var(--accent);margin:6px 0}.modal p{margin:6px 0;color:var(--dim);font-size:14px}.modal .mstats{font-size:13px;line-height:1.5}