* {
  box-sizing: border-box;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: #172026;
  background: #f3f5f7;
}

.app {
  min-height: 100vh;
  display: grid;
  place-items: center;
  padding: 24px;
}

.panel {
  width: min(560px, 100%);
  padding: 28px;
  background: #ffffff;
  border: 1px solid #d9e0e6;
  border-radius: 8px;
  box-shadow: 0 16px 40px rgba(23, 32, 38, 0.08);
}

h1 {
  margin: 0;
  font-size: 28px;
  line-height: 1.2;
}

.header {
  margin-bottom: 20px;
}

.eyebrow {
  margin: 0 0 6px;
  color: #64748b;
  font-size: 13px;
}

.result {
  min-height: 132px;
  padding: 18px;
  border: 1px solid #d9e0e6;
  border-radius: 8px;
  background: #fbfcfd;
}

.result h2 {
  margin: 0 0 10px;
  font-size: 20px;
}

.number {
  display: inline-flex;
  align-items: center;
  height: 28px;
  margin-bottom: 12px;
  padding: 0 10px;
  border-radius: 999px;
  color: #0f766e;
  background: #ccfbf1;
  font-size: 14px;
}

.result p {
  margin: 0;
  color: #42505c;
  line-height: 1.7;
}

.result.empty,
.result.error {
  color: #6b7785;
  display: grid;
  place-items: center;
  text-align: center;
}

.result.error {
  color: #b42318;
  background: #fff7f5;
  border-color: #f4b8ae;
}

@media (max-width: 520px) {
  .panel {
    padding: 20px;
  }
}