:root{--bg: #0c1117;--panel: #18222d;--line: #2a3a49;--ink: #e8f1f7;--dim: #93a7b8;--accent: #4a9cc0;--rail: #62d98a;--ok: #7fe0ff;--bad: #e0654a}*{box-sizing:border-box}html,body{margin:0;height:100%}body{background:radial-gradient(900px 560px at 50% -8%,#142230,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:600px;padding:12px 12px 26px}header{text-align:center;margin-bottom:6px}h1{margin:0;font-size:26px;letter-spacing:5px;font-weight:800;color:var(--accent)}.sub{margin:4px auto 0;color:var(--dim);font-size:12.5px;max-width:460px;line-height:1.4}.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:#06222e}.btn{background:var(--panel);border:1px solid var(--line);color:var(--ink);padding:7px 14px;border-radius:999px;font:700 13px system-ui;cursor:pointer}.btn:hover{border-color:var(--accent)}.status{text-align:center;min-height:20px;margin:6px 0;color:var(--dim);font-size:13px;font-weight:600}.status b{color:var(--ink)}.rail-note{color:var(--rail);font-weight:600}.stage{position:relative;display:flex;justify-content:center}canvas{width:100%;max-width:480px;height:auto;display:block;border-radius:8px;background:#0e131a;box-shadow:0 12px 34px #0000008c;touch-action:none}.overlay{position:absolute;inset:0;display:flex;align-items:center;justify-content:center;background:#060c12bd;border-radius:8px;backdrop-filter:blur(3px)}.overlay.hidden{display:none}.card{background:var(--panel);border:1px solid var(--line);border-radius:16px;padding:22px 26px;text-align:center;max-width:340px}.card h2{margin:0 0 6px;font-size:24px;color:var(--accent)}.card p{margin:6px 0;color:var(--dim);font-size:14px}.card p b{color:var(--ink)}.card .row{display:flex;gap:8px;justify-content:center;margin-top:14px}.modules{display:flex;flex-wrap:wrap;gap:8px;justify-content:center;margin:14px 0 4px}.module{background:var(--panel);border:1px solid var(--line);border-radius:10px;padding:7px 9px;cursor:pointer;color:var(--ink);min-width:78px;transition:border-color .12s,transform .06s}.module:hover{border-color:var(--accent)}.module:active{transform:translateY(1px)}.module.rail{border-color:var(--rail);box-shadow:0 0 0 1px #62d98a4d}.mlabel{font:700 11px ui-monospace,monospace;color:var(--dim);margin-bottom:4px;text-align:center}.module.rail .mlabel{color:var(--rail)}.mat{display:grid;grid-template-columns:1fr 1fr;gap:1px 8px;font:700 13px ui-monospace,monospace;justify-items:center;padding:0 4px;border-left:2px solid var(--line);border-right:2px solid var(--line)}.chainbar{display:flex;flex-wrap:wrap;gap:4px;align-items:center;justify-content:center;min-height:24px;margin:8px 0;font-size:12.5px}.chainbar .empty{color:var(--dim);font-style:italic}.chainbar .chip{background:#4a9cc029;border:1px solid var(--accent);color:var(--ok);border-radius:999px;padding:3px 9px;font-weight:600}.chainbar .arrowsep{color:var(--dim)}.rails-toggle{display:flex;gap:6px;align-items:center;justify-content:center;color:var(--dim);font-size:12.5px;margin:4px 0;cursor:pointer}.rails-toggle input{accent-color:var(--rail)}.hint{text-align:center;color:var(--dim);font-size:12px;margin-top:10px;line-height:1.4}