:root {
  --paper: #e7e2cd;
  --note: #eee9d6;
  --ink: #1b4332;
  --ink-soft: #4a6456;
  --gold: #9c7a2e;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100vh;
  font-family: 'EB Garamond', serif;
  color: var(--ink);
  background: radial-gradient(1200px 700px at 50% -10%, rgba(27,67,50,0.08), transparent 60%), var(--paper);
  display: flex;
  justify-content: center;
  padding: 56px 20px;
}

.wrap { width: 100%; max-width: 460px; }

header { margin-bottom: 26px; text-align: center; }
.tag { font-size: 11.5px; letter-spacing: 0.14em; text-transform: uppercase; color: var(--gold); margin: 0 0 10px; }
h1 {
  font-family: 'Cinzel', serif;
  font-weight: 700;
  font-size: 26px;
  letter-spacing: 0.03em;
  margin: 0 0 12px;
  color: var(--ink);
}
.desc { font-size: 14px; color: var(--ink-soft); line-height: 1.6; margin: 0; }

.note {
  background: var(--note);
  padding: 6px;
  background-image:
    repeating-conic-gradient(from 0deg, rgba(27,67,50,0.035) 0deg 1deg, transparent 1deg 6deg);
}

.note-border {
  border: 2px solid var(--ink);
  outline: 1px solid var(--ink);
  outline-offset: 4px;
  padding: 26px 24px;
}

.row { display: grid; grid-template-columns: 1fr auto 1fr; gap: 10px; align-items: center; margin-bottom: 12px; }
.row.single { grid-template-columns: 1fr; }

input, select {
  min-width: 0;
  background: rgba(255,255,255,0.55);
  border: 1px solid var(--ink-soft);
  border-radius: 2px;
  padding: 10px 11px;
  font-family: 'EB Garamond', serif;
  font-size: 15px;
  color: var(--ink);
}
input:focus, select:focus { outline: none; border-color: var(--gold); }

.swap {
  background: none;
  border: 1px solid var(--ink-soft);
  border-radius: 50%;
  width: 34px; height: 34px;
  color: var(--ink);
  cursor: pointer;
  font-size: 14px;
}
.swap:hover { border-color: var(--gold); color: var(--gold); }

button.convert {
  width: 100%;
  background: var(--ink);
  color: var(--note);
  border: none;
  font-family: 'Cinzel', serif;
  font-size: 13px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  padding: 12px;
  cursor: pointer;
  margin-top: 4px;
}
button.convert:hover { background: #0f2e21; }

.error { color: #8a3a2a; font-size: 12.5px; margin-top: 10px; text-align: center; }

.result {
  position: relative;
  margin-top: 22px;
  border-top: 1px solid var(--ink-soft);
  border-bottom: 1px solid var(--ink-soft);
  padding: 20px 10px;
  text-align: center;
}
.corner { position: absolute; color: var(--gold); font-size: 14px; opacity: 0.8; }
.corner.tl { top: 4px; left: 4px; }
.corner.tr { top: 4px; right: 4px; }
.corner.bl { bottom: 4px; left: 4px; }
.corner.br { bottom: 4px; right: 4px; }

.amount {
  font-family: 'Cinzel', serif;
  font-weight: 600;
  font-size: 30px;
  color: var(--ink);
}
.rate { font-size: 12.5px; color: var(--ink-soft); margin-top: 8px; font-style: italic; }

footer { margin-top: 26px; text-align: center; }
footer a { color: var(--ink-soft); font-size: 12px; text-decoration: none; }
footer a:hover { color: var(--gold); }