:root{color-scheme:light;--bg: #0f1419;--panel: #1a222c;--text: #e8eef4;--muted: #8b9aab;--accent: #3d9cf0;--danger: #e85d5d;font-family:Segoe UI,IBM Plex Sans,sans-serif}*{box-sizing:border-box}body{margin:0;min-height:100vh;background:radial-gradient(100% 80% at 0% 0%,#1c2a3a 0%,var(--bg) 50%);color:var(--text)}#root{max-width:520px;margin:0 auto;padding:24px 16px}.brand{font-size:2rem;font-weight:700;letter-spacing:.04em;margin-bottom:8px}.card{background:color-mix(in srgb,var(--panel) 90%,transparent);border:1px solid #2a3644;border-radius:12px;padding:16px;margin:12px 0}input,textarea,button{font:inherit}input,textarea{width:100%;margin:6px 0 12px;padding:8px 10px;border-radius:8px;border:1px solid #334455;background:#0c1117;color:var(--text)}button{border:0;border-radius:8px;padding:8px 12px;background:var(--accent);color:#061018;font-weight:600;cursor:pointer;margin-right:8px}button.secondary{background:#2a3644;color:var(--text)}button.danger{background:var(--danger);color:#fff}.mono{font-family:Cascadia Code,Consolas,monospace;word-break:break-all;font-size:.85rem}.muted{color:var(--muted)}.error{color:var(--danger)}select{width:100%;margin:6px 0 12px;padding:8px 10px;border-radius:8px;border:1px solid #334455;background:#0c1117;color:var(--text)}label.check{display:flex;align-items:center;gap:8px;margin-bottom:12px}label.check input{width:auto;margin:0}.chain-scroll{max-height:360px;overflow:auto;margin-top:8px}.chain-row{border-top:1px solid #2a3644;padding:8px 0}.chain-head{display:flex;align-items:center;justify-content:space-between;gap:8px}button:disabled{opacity:.5;cursor:not-allowed}