/* Theme-aware, dependency-free. Light palette on :root, dark via media query. */
:root {
  --bg: #f6f7f9; --card: #ffffff; --ink: #1a1d21; --muted: #6b7280;
  --line: #e5e7eb; --accent: #2563eb;
  --green: #16a34a; --green-bg: #dcfce7;
  --amber: #b45309; --amber-bg: #fef3c7;
  --red: #dc2626;   --red-bg: #fee2e2;
  --market: #6b7280; --visa: #1a1f71; --mc: #eb001b; --wise: #163300;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1115; --card: #191c22; --ink: #e6e8eb; --muted: #9aa1ab;
    --line: #2a2e37; --accent: #60a5fa;
    --green: #4ade80; --green-bg: #14351f;
    --amber: #fbbf24; --amber-bg: #3a2c08;
    --red: #f87171;   --red-bg: #3a1414;
    --market: #9aa1ab; --visa: #7f8bff; --mc: #ff5a6e; --wise: #9fe870;
  }
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--bg); color: var(--ink);
  font: 15px/1.5 system-ui, -apple-system, Segoe UI, Roboto, sans-serif; }
.bar { display: flex; align-items: center; justify-content: space-between;
  gap: 12px; padding: 14px 18px; border-bottom: 1px solid var(--line); flex-wrap: wrap; }
h1 { font-size: 18px; margin: 0; }
h2 { font-size: 14px; font-weight: 600; margin: 0 0 8px; }
.controls { display: flex; align-items: flex-end; gap: 8px; flex-wrap: wrap; }
.ccy { display: flex; flex-direction: column; font-size: 11px; color: var(--muted); gap: 3px; }
select { font: inherit; padding: 5px 8px; border-radius: 8px;
  border: 1px solid var(--line); background: var(--card); color: var(--ink); }
.controls button { font-size: 16px; height: 34px; min-width: 34px; padding: 0 8px;
  border-radius: 8px; border: 1px solid var(--line); background: var(--card);
  color: var(--ink); cursor: pointer; }
.controls button:hover { border-color: var(--accent); }
#swap { font-weight: 700; }
main { max-width: 860px; margin: 0 auto; padding: 18px; }
.status { padding: 10px 12px; border-radius: 8px; background: var(--amber-bg);
  color: var(--amber); margin: 0 0 14px; }

.cards { display: grid; grid-template-columns: repeat(auto-fit, minmax(180px, 1fr)); gap: 12px; }
@media (max-width: 640px) { .cards { grid-template-columns: 1fr 1fr; } }
@media (max-width: 420px) { .cards { grid-template-columns: 1fr; } }
.rate-card { background: var(--card); border: 1px solid var(--line);
  border-radius: 14px; padding: 14px 16px; position: relative; }
.rate-card.stale { opacity: .65; }
.rate-card .src { font-size: 12px; text-transform: uppercase; letter-spacing: .04em;
  color: var(--muted); display: flex; align-items: center; gap: 7px; }
.dot { width: 9px; height: 9px; border-radius: 50%; display: inline-block; }
.src.market .dot { background: var(--market); }
.src.visa .dot { background: var(--visa); }
.src.mastercard .dot { background: var(--mc); }
.src.wise .dot { background: var(--wise); }
.rate-card .val { font-size: 30px; font-weight: 650; margin: 8px 0 2px;
  font-variant-numeric: tabular-nums; }
.rate-card .val.missing { color: var(--muted); font-size: 22px; }
.rate-card .sub { font-size: 12px; color: var(--muted); }
.rate-card .spread { font-size: 12px; margin-top: 4px; }
.spread.up { color: var(--red); } .spread.down { color: var(--green); }

.badge { position: absolute; top: 12px; right: 12px; font-size: 11px; font-weight: 600;
  padding: 3px 8px; border-radius: 999px; }
.badge.green { background: var(--green-bg); color: var(--green); }
.badge.amber { background: var(--amber-bg); color: var(--amber); }
.badge.red { background: var(--red-bg); color: var(--red); }

.chartwrap { margin-top: 22px; background: var(--card); border: 1px solid var(--line);
  border-radius: 14px; padding: 14px 16px; }
#chart svg { width: 100%; height: auto; display: block; }
.legend { display: flex; gap: 16px; margin-top: 8px; font-size: 12px; color: var(--muted); flex-wrap: wrap; }
.legend .k { display: inline-flex; align-items: center; gap: 6px; }
.legend .swatch { width: 12px; height: 3px; border-radius: 2px; display: inline-block; }
.foot { display: flex; justify-content: space-between; gap: 12px; margin-top: 16px; flex-wrap: wrap; }
.muted { color: var(--muted); font-size: 12px; }