:root {
  --bg: #0d1117;
  --bg-elev: #161b22;
  --border: #30363d;
  --text: #e6edf3;
  --text-dim: #8b949e;
  --accent: #f7931a;   /* bitcoin orange */
  --accent-hover: #ffa94d;
  --ok: #3fb950;
  --err: #f85149;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.5;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.container { width: 100%; max-width: 720px; margin: 0 auto; padding: 0 1.25rem; }

/* Header */
.site-header { border-bottom: 1px solid var(--border); background: var(--bg-elev); }
.header-inner { display: flex; align-items: center; justify-content: space-between; padding: 0.9rem 1.25rem; }
.brand { display: flex; align-items: center; gap: 0.6rem; text-decoration: none; color: var(--text); font-weight: 600; }
.brand-mark { color: var(--accent); font-size: 1.3rem; }
.site-nav { display: flex; gap: 1.25rem; }
.site-nav a { color: var(--text-dim); text-decoration: none; font-size: 0.95rem; }
.site-nav a:hover { color: var(--text); }

/* Main */
main { flex: 1; padding: 2.5rem 0; }

.hero h1 { margin: 0 0 0.4rem; font-size: 1.8rem; }
.lede { color: var(--text-dim); margin: 0 0 1rem; }
.chain-height { color: var(--text-dim); font-size: 0.95rem; }
.chain-height strong { color: var(--accent); }

/* Notice */
.notice {
  margin-top: 1.5rem;
  padding: 1rem 1.25rem;
  background: rgba(247, 147, 26, 0.08);
  border: 1px solid rgba(247, 147, 26, 0.35);
  border-radius: 10px;
  font-size: 0.95rem;
}
.notice p { margin: 0 0 0.5rem; }
.notice p:last-child { margin-bottom: 0; }
.notice-addr code {
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  color: var(--accent);
  word-break: break-all;
}

/* Card */
.card {
  background: var(--bg-elev);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 1.5rem;
  margin-top: 1.5rem;
}
.card h2 { margin: 0 0 1rem; font-size: 1.1rem; }

label { display: block; margin-bottom: 0.4rem; font-size: 0.9rem; color: var(--text-dim); }
.input-row { display: flex; gap: 0.6rem; }
input[type="text"] {
  flex: 1;
  padding: 0.6rem 0.8rem;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  color: var(--text);
  font-size: 1rem;
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
}
input[type="text"]:focus { outline: none; border-color: var(--accent); }

button {
  padding: 0.6rem 1.2rem;
  background: var(--accent);
  color: #0d1117;
  border: none;
  border-radius: 6px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
}
button:hover { background: var(--accent-hover); }
button:disabled { opacity: 0.6; cursor: not-allowed; }

.hint { color: var(--text-dim); font-size: 0.8rem; margin: 0.8rem 0 0; }

/* Result */
.result { margin-top: 1rem; padding: 0.8rem 1rem; border-radius: 6px; font-size: 0.95rem; }
.result.ok { background: rgba(63, 185, 80, 0.12); border: 1px solid var(--ok); color: var(--ok); }
.result.err { background: rgba(248, 81, 73, 0.12); border: 1px solid var(--err); color: var(--err); }
.result code { font-family: ui-monospace, SFMono-Regular, Menlo, monospace; word-break: break-all; }

/* Footer */
.site-footer { border-top: 1px solid var(--border); padding: 1rem 0; }
.site-footer p { color: var(--text-dim); font-size: 0.8rem; margin: 0; }

/* Code block */
.code-block {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 6px;
  padding: 1rem 1.25rem;
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
  font-size: 0.88rem;
  color: var(--text);
  overflow-x: auto;
  margin: 0.8rem 0;
  white-space: pre;
}

/* Info table */
.info-table { width: 100%; border-collapse: collapse; font-size: 0.92rem; margin: 0.8rem 0; }
.info-table th { text-align: left; color: var(--text-dim); font-weight: 500; padding: 0.4rem 0.8rem 0.4rem 0; width: 40%; }
.info-table td { color: var(--text); padding: 0.4rem 0; }
.info-table tr { border-bottom: 1px solid var(--border); }
.info-table tr:last-child { border-bottom: none; }

/* Status badges */
.badge { display: inline-block; padding: 0.2rem 0.6rem; border-radius: 4px; font-size: 0.82rem; font-weight: 600; }
.badge-active    { background: rgba(63,185,80,0.15);  color: var(--ok);    border: 1px solid var(--ok); }
.badge-locked_in { background: rgba(247,147,26,0.15); color: var(--accent); border: 1px solid var(--accent); }
.badge-started   { background: rgba(247,147,26,0.08); color: var(--accent); border: 1px solid rgba(247,147,26,0.4); }
.badge-defined   { background: rgba(139,148,158,0.15); color: var(--text-dim); border: 1px solid var(--border); }