:root {
  color-scheme: light;
  --bg: #f5f7fb;
  --panel: #ffffff;
  --text: #172033;
  --muted: #667085;
  --line: #d9e0ec;
  --primary: #1f6feb;
  --primary-hover: #195fc9;
  --secondary: #eef3fb;
  --secondary-hover: #e4ebf7;
  --shadow: 0 20px 60px rgba(28, 39, 64, 0.12);
}

* {
  box-sizing: border-box;
}

body {
  min-height: 100vh;
  margin: 0;
  font-family: Inter, "Segoe UI", Arial, sans-serif;
  color: var(--text);
  background:
    radial-gradient(circle at top left, rgba(31, 111, 235, 0.14), transparent 34rem),
    linear-gradient(135deg, #f8fbff 0%, var(--bg) 100%);
}

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

.panel {
  width: min(100%, 520px);
  padding: 36px;
  background: rgba(255, 255, 255, 0.9);
  border: 1px solid rgba(217, 224, 236, 0.85);
  border-radius: 8px;
  box-shadow: var(--shadow);
  backdrop-filter: blur(14px);
}

.heading {
  margin-bottom: 28px;
}

.eyebrow {
  display: block;
  margin-bottom: 10px;
  font-size: 12px;
  font-weight: 700;
  color: var(--primary);
  text-transform: uppercase;
}

h1 {
  margin: 0;
  font-size: 30px;
  line-height: 1.2;
}

p {
  margin: 10px 0 0;
  color: var(--muted);
  line-height: 1.6;
}

.key-box {
  min-height: 76px;
  display: flex;
  align-items: center;
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fbfcff;
}

.key-output {
  width: 100%;
  overflow-wrap: anywhere;
  font-family: "Cascadia Mono", Consolas, "Courier New", monospace;
  font-size: 20px;
  line-height: 1.45;
  color: #0f172a;
}

.actions {
  display: grid;
  grid-template-columns: 1fr 112px;
  gap: 12px;
  margin-top: 18px;
}

.button {
  min-height: 46px;
  border: 0;
  border-radius: 8px;
  font-size: 15px;
  font-weight: 700;
  cursor: pointer;
  transition: transform 140ms ease, background-color 140ms ease, box-shadow 140ms ease;
}

.button:hover {
  transform: translateY(-1px);
}

.button:active {
  transform: translateY(0);
}

.button:focus-visible {
  outline: 3px solid rgba(31, 111, 235, 0.28);
  outline-offset: 2px;
}

.primary {
  color: #ffffff;
  background: var(--primary);
  box-shadow: 0 10px 24px rgba(31, 111, 235, 0.24);
}

.primary:hover {
  background: var(--primary-hover);
}

.secondary {
  color: var(--text);
  background: var(--secondary);
}

.secondary:hover {
  background: var(--secondary-hover);
}

.status {
  min-height: 22px;
  margin-top: 14px;
  font-size: 14px;
}

@media (max-width: 520px) {
  .app {
    padding: 16px;
  }

  .panel {
    padding: 26px 20px;
  }

  h1 {
    font-size: 26px;
  }

  .key-output {
    font-size: 17px;
  }

  .actions {
    grid-template-columns: 1fr;
  }
}