:root {
  --bg: #0f1220;
  --card: #1a1f35;
  --accent: #7c5cff;
  --text: #e8eaf6;
  --muted: #8a90b4;
  --ok: #3ddc97;
}
* { box-sizing: border-box; margin: 0; padding: 0; }
body {
  font-family: -apple-system, "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
}
#app { max-width: 960px; margin: 0 auto; padding: 16px; }
header {
  display: flex; justify-content: space-between; align-items: center;
  padding: 16px 0; border-bottom: 1px solid #262c48;
}
.logo { font-size: 20px; font-weight: 700; }
nav { display: flex; gap: 16px; align-items: center; }
nav a { color: var(--muted); text-decoration: none; }
nav a:hover { color: var(--text); }
main { padding: 32px 0; }
h1 { font-size: 28px; margin-bottom: 4px; }
.muted { color: var(--muted); }
.rates {
  display: grid; gap: 12px; margin: 24px 0;
  grid-template-columns: repeat(auto-fill, minmax(210px, 1fr));
}
.rate-card {
  background: var(--card); border-radius: 12px; padding: 16px;
  border: 1px solid #262c48; cursor: pointer;
}
.rate-card.selected { border-color: var(--accent); }
.rate-card .coin { font-weight: 700; font-size: 18px; }
.rate-card .course { font-size: 15px; color: var(--ok); margin: 6px 0 2px; }
.rate-card .upd { color: var(--muted); font-size: 12px; }
.card {
  background: var(--card); border-radius: 12px; padding: 20px;
  border: 1px solid #262c48;
}
.calc { max-width: 480px; }
.calc label { display: block; margin: 12px 0 4px; color: var(--muted); font-size: 14px; }
.calc input, .calc select {
  width: 100%; padding: 10px 12px; border-radius: 8px;
  border: 1px solid #323a5f; background: #12162a; color: var(--text); font-size: 16px;
}
.result { font-size: 22px; font-weight: 700; color: var(--ok); padding: 6px 0; }
.btn {
  border: none; border-radius: 8px; padding: 10px 18px;
  font-size: 15px; cursor: pointer; margin-top: 16px;
}
.btn.primary { background: var(--accent); color: #fff; width: 100%; }
.btn.ghost { background: transparent; border: 1px solid #323a5f; color: var(--text); margin-top: 0; }
.skeleton { height: 90px; border-radius: 12px; background: #1d2340; animation: pulse 1.2s infinite; }
@keyframes pulse { 50% { opacity: .6; } }
.err { color: #ff7a90; font-size: 14px; margin-top: 8px; }
footer { padding: 24px 0; color: var(--muted); font-size: 13px; text-align: center; }