:root {
  --ink: #14212b;
  --muted: #3a4a56;
  --paper: #e7eef3;
  --line: rgba(20, 33, 43, 0.12);
  --bad: #8f2f2f;
  --font-d: "Syne", system-ui, sans-serif;
  --font-b: "Figtree", system-ui, sans-serif;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--font-b);
  color: var(--ink);
  background: linear-gradient(165deg, #f3f7fa, var(--paper) 50%, #d5e2eb);
}
.top {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem clamp(1rem, 3vw, 2rem);
}
.brand { font-family: var(--font-d); font-weight: 700; text-decoration: none; color: inherit; }
.brand span { font-weight: 800; margin-right: .35rem; letter-spacing: .05em; }
.links { display: flex; gap: 1rem; }
.link { color: var(--muted); text-decoration: none; }
.link:hover { color: var(--ink); }
main { max-width: 560px; margin: 0 auto; padding: 0 clamp(1rem,3vw,2rem) 3rem; }
.warn {
  background: rgba(143, 47, 47, 0.08);
  border: 1px solid rgba(143, 47, 47, 0.2);
  padding: .85rem 1rem;
  border-radius: 8px;
  font-size: .92rem;
  color: var(--bad);
}
.panel { margin-top: 1.5rem; }
h1, h2 { font-family: var(--font-d); letter-spacing: -.02em; }
h1 { font-size: 1.8rem; margin: 0 0 1rem; }
h2 { font-size: 1.15rem; margin: 0 0 .6rem; }
.hint { color: var(--muted); margin: 0 0 .8rem; font-size: .92rem; }
.label { margin: 0; text-transform: uppercase; letter-spacing: .08em; font-size: .75rem; color: var(--muted); }
.balance { font-family: var(--font-d); font-size: 2.4rem; font-weight: 800; margin: .2rem 0; }
.stats {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: .55rem .8rem;
  margin: .75rem 0 1rem;
}
.stats .k {
  display: block;
  font-size: .68rem;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--muted);
}
.stats .v {
  font-family: var(--font-d);
  font-weight: 700;
  font-size: 1.05rem;
}
.countdown {
  margin: 0 0 1rem;
  padding: .7rem .85rem;
  border-radius: 6px;
  background: rgba(20,33,43,.07);
  font-family: var(--font-d);
  font-weight: 700;
  font-variant-numeric: tabular-nums;
}
.countdown.ready { color: #2a5a3a; }
.meta { color: var(--muted); margin: 0 0 .35rem; }
.meta.subtle { font-size: .85rem; margin-bottom: 1rem; }
label { display: grid; gap: .3rem; margin: .7rem 0; font-size: .85rem; color: var(--muted); }
input {
  width: 100%;
  padding: .75rem .85rem;
  border: 1.5px solid var(--line);
  border-radius: 6px;
  font: inherit;
  background: rgba(255,255,255,.65);
  color: var(--ink);
}
.row { display: flex; flex-wrap: wrap; gap: .6rem; }
.actions { margin-top: 1.5rem; }
button {
  border: 0;
  border-radius: 6px;
  padding: .75rem 1.1rem;
  font: inherit;
  font-weight: 600;
  background: var(--ink);
  color: var(--paper);
  cursor: pointer;
}
button.ghost {
  background: transparent;
  color: var(--ink);
  box-shadow: inset 0 0 0 1.5px var(--ink);
}
button.small { padding: .4rem .7rem; font-size: .85rem; }
button.danger { color: var(--bad); box-shadow: inset 0 0 0 1.5px var(--bad); }
button:disabled { opacity: .5; cursor: wait; }

.tabs {
  display: flex;
  flex-wrap: wrap;
  gap: .35rem;
  margin: 1rem 0 1.2rem;
  border-bottom: 1px solid var(--line);
  padding-bottom: .5rem;
}
.tab {
  background: transparent;
  color: var(--muted);
  padding: .5rem .75rem;
  box-shadow: none;
  font-weight: 600;
}
.tab.active {
  color: var(--ink);
  box-shadow: inset 0 -2px 0 var(--ink);
  border-radius: 0;
}
.tab-panel { animation: fade .25s ease; }
@keyframes fade {
  from { opacity: 0; transform: translateY(4px); }
  to { opacity: 1; transform: none; }
}

.addr, .secrets code {
  display: block;
  word-break: break-all;
  background: rgba(20,33,43,.06);
  padding: .7rem .8rem;
  border-radius: 6px;
  font-size: .85rem;
  margin: .4rem 0 .6rem;
}
.qr {
  display: block;
  margin: 1rem 0;
  background: #fff;
  padding: .5rem;
  border-radius: 8px;
}
.secrets { margin: .5rem 0; color: var(--muted); }
.utxo-list { display: grid; gap: .55rem; }
.utxo {
  background: rgba(20,33,43,.05);
  padding: .7rem .8rem;
  border-radius: 6px;
  font-size: .85rem;
}
.utxo strong { font-family: var(--font-d); }
.utxo .tag {
  display: inline-block;
  margin-left: .4rem;
  font-size: .72rem;
  letter-spacing: .04em;
  text-transform: uppercase;
  color: var(--bad);
}
.log {
  margin-top: .8rem;
  padding: .7rem .8rem;
  background: rgba(20,33,43,.08);
  border-radius: 6px;
  font-size: .8rem;
  overflow-x: auto;
  white-space: pre-wrap;
  word-break: break-all;
}
.toast {
  position: fixed;
  left: 50%;
  bottom: 1.2rem;
  transform: translateX(-50%);
  background: var(--ink);
  color: var(--paper);
  padding: .8rem 1rem;
  border-radius: 8px;
  max-width: 90vw;
  font-size: .9rem;
  z-index: 20;
}