:root {
  --bg: #f3f6fb;
  --text: #0b1320;
  --card: #ffffff;
  --line: #c9d3e0;
  --accent: #0b6bcb;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  color: var(--text);
  font-family: "Segoe UI", "Helvetica Neue", Arial, sans-serif;
  background: radial-gradient(circle at top, #dcecff, var(--bg));
}

.container {
  width: min(900px, 92vw);
  margin: 2rem auto;
  display: grid;
  gap: 1rem;
}

.card {
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 1rem;
}

h1,
h2 {
  margin-top: 0;
}

input,
textarea,
button {
  width: 100%;
  margin-top: 0.5rem;
  padding: 0.6rem 0.7rem;
  border-radius: 8px;
  border: 1px solid var(--line);
  font-size: 1rem;
}

button {
  background: var(--accent);
  color: #fff;
  border: none;
  cursor: pointer;
}

pre {
  overflow: auto;
  white-space: pre-wrap;
  word-break: break-word;
  background: #f8fbff;
  border-radius: 8px;
  padding: 0.8rem;
}