:root {
  --bg0: #0b1020;
  --bg1: #121c35;
  --fg: #eaf0ff;
  --muted: #b9c3e6;
  --card: rgba(255, 255, 255, 0.08);
  --card2: rgba(255, 255, 255, 0.12);
  --accent: #ffb200;
  --accent2: #62d5ff;
  --shadow: 0 20px 50px rgba(0, 0, 0, 0.45);
  --radius: 18px;
  --mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono",
    "Courier New", monospace;
}

* {
  box-sizing: border-box;
}

html,
body {
  height: 100%;
}

body {
  margin: 0;
  color: var(--fg);
  background: radial-gradient(1200px 700px at 15% 10%, rgba(98, 213, 255, 0.18), transparent 60%),
    radial-gradient(900px 600px at 80% 25%, rgba(255, 178, 0, 0.14), transparent 55%),
    linear-gradient(180deg, var(--bg0), var(--bg1));
  font: 16px/1.5 system-ui, -apple-system, Segoe UI, Roboto, Helvetica, Arial,
    sans-serif;
}

.wrap {
  width: min(920px, calc(100% - 48px));
  margin: 48px auto;
}

.hero {
  padding: 22px 4px 10px;
}

h1 {
  margin: 0 0 6px;
  font-size: 56px;
  line-height: 1.02;
  letter-spacing: -0.03em;
}

.sub {
  margin: 0;
  color: var(--muted);
}

.card {
  margin-top: 24px;
  padding: 18px;
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: var(--radius);
  background: linear-gradient(180deg, var(--card), rgba(255, 255, 255, 0.03));
  box-shadow: var(--shadow);
  backdrop-filter: blur(10px);
}

.row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

h2 {
  margin: 0;
  font-size: 18px;
  letter-spacing: -0.01em;
  color: rgba(255, 255, 255, 0.92);
}

button {
  appearance: none;
  border: 1px solid rgba(255, 255, 255, 0.18);
  color: var(--fg);
  background: linear-gradient(180deg, var(--card2), rgba(255, 255, 255, 0.06));
  padding: 10px 12px;
  border-radius: 12px;
  cursor: pointer;
}

button:hover {
  border-color: rgba(255, 255, 255, 0.28);
}

button:active {
  transform: translateY(1px);
}

.out {
  margin: 14px 0 8px;
  padding: 14px;
  background: rgba(0, 0, 0, 0.32);
  border: 1px solid rgba(255, 255, 255, 0.10);
  border-radius: 14px;
  overflow: auto;
  font-family: var(--mono);
  font-size: 13px;
}

.hint {
  margin: 0;
  color: var(--muted);
  font-size: 13px;
}

code {
  font-family: var(--mono);
  color: rgba(255, 255, 255, 0.92);
}

.foot {
  margin-top: 18px;
  color: rgba(255, 255, 255, 0.55);
  font-size: 12px;
}

@media (max-width: 520px) {
  .wrap {
    margin: 28px auto;
  }

  h1 {
    font-size: 42px;
  }

  .row {
    align-items: flex-start;
    flex-direction: column;
  }
}