:root {
  --bg: #0e131d; --panel: #161d2b; --line: #2a3040;
  --txt: #dbe2ef; --dim: #8a93a6; --acc: #6ea8fe;
  --grn: #3ddc84; --amb: #ffce54; --pur: #c792ea;
}
* { box-sizing: border-box; }
body {
  background: var(--bg); color: var(--txt);
  font-family: system-ui, -apple-system, "Segoe UI", sans-serif;
  max-width: 980px; margin: 0 auto; padding: 1.5rem;
  line-height: 1.55;
}
h1 { font-size: 1.6rem; margin-bottom: 0.2rem; }
h2 { font-size: 1.2rem; border-bottom: 1px solid var(--line); padding-bottom: 0.3rem; margin-top: 2.2rem; }
.subtitle { color: var(--dim); margin-top: 0; }
section.panel {
  background: var(--panel); border: 1px solid var(--line);
  border-radius: 10px; padding: 1.2rem; margin-top: 1rem;
}
.warn {
  border: 1px solid var(--amb); border-radius: 8px;
  padding: 0.7rem 1rem; margin: 1rem 0; font-size: 0.92rem;
}
.warn b { color: var(--amb); }
input[type="text"], input[type="number"] {
  background: #0b101a; color: var(--txt);
  border: 1px solid var(--line); border-radius: 6px;
  padding: 0.5rem 0.7rem; font-size: 1rem;
}
#privkey { width: 100%; font-family: ui-monospace, monospace; }
button {
  background: #24406e; color: #fff; border: 0; border-radius: 6px;
  padding: 0.55rem 1.1rem; font-size: 0.95rem; cursor: pointer; margin: 0.3rem 0.3rem 0.3rem 0;
}
button:hover { background: #2f5290; }
button.ghost { background: transparent; border: 1px solid var(--line); }
.mono { font-family: ui-monospace, monospace; font-size: 0.85rem; word-break: break-all; }
.kv { display: grid; grid-template-columns: 130px 1fr; gap: 0.3rem 1rem; margin: 0.8rem 0; }
.kv dt { color: var(--dim); }
.kv dd { margin: 0; }
.ok { color: var(--grn); } .err { color: #ff7a7a; }
#key-error { color: #ff7a7a; min-height: 1.2em; }
.grid2 { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }
@media (max-width: 700px) { .grid2 { grid-template-columns: 1fr; } .kv { grid-template-columns: 1fr; } }
.tablewrap { max-height: 260px; overflow-y: auto; border: 1px solid var(--line); border-radius: 6px; }
table { border-collapse: collapse; width: 100%; font-size: 0.82rem; }
th, td { border-bottom: 1px solid var(--line); padding: 0.25rem 0.5rem; text-align: left; }
td.one { color: var(--amb); font-weight: bold; }
.bits { font-family: ui-monospace, monospace; font-size: 1rem; line-height: 2; word-break: break-all; }
.bit { display: inline-block; min-width: 1.3em; text-align: center; border-radius: 4px; margin: 1px; background: #222a3b; color: var(--dim); }
.bit.one { background: #24406e; color: #fff; }
.bit.cur { outline: 2px solid var(--amb); }
canvas.chart { width: 100%; display: block; }
.flow { font-size: 1.05rem; text-align: center; margin: 1rem 0; }
.flow .arrow { color: var(--acc); }
.controls { display: flex; flex-wrap: wrap; gap: 0.6rem 1.2rem; align-items: center; margin: 0.7rem 0; }
.progress { height: 10px; background: #0b101a; border-radius: 5px; overflow: hidden; margin: 0.6rem 0; }
.progress > div { height: 100%; width: 0%; background: var(--acc); transition: width 0.15s; }
label.opt { display: inline-block; margin-right: 1rem; }
table.compare td, table.compare th { font-size: 0.85rem; }
footer { color: var(--dim); font-size: 0.85rem; margin: 2rem 0; }
code { background: #0b101a; padding: 0.1em 0.4em; border-radius: 4px; font-size: 0.88em; }