:root {
  --bg: #f7f8fb;
  --card: #ffffff;
  --line: #d7dce6;
  --text: #1f2937;
  --muted: #5a6473;
  --accent: #0f766e;
  --accent-2: #0d9488;
  --err: #b42318;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Segoe UI", "Helvetica Neue", sans-serif;
  background: radial-gradient(circle at 20% 0%, #edf9f7 0%, var(--bg) 45%);
  color: var(--text);
}

.page {
  display: flex;
  min-height: 100vh;
  align-items: center;
  justify-content: center;
  padding: 24px;
}

.card {
  width: min(920px, 100%);
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: 16px;
  padding: 22px;
  box-shadow: 0 20px 42px rgba(8, 30, 36, 0.08);
}

h1,
h2 {
  margin: 0;
}
h1 {
  font-size: 1.7rem;
}
h2 {
  font-size: 1.02rem;
  margin-bottom: 8px;
}

.muted {
  color: var(--muted);
  margin-top: 8px;
  margin-bottom: 18px;
}

.stack {
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 14px;
  margin-bottom: 14px;
  display: grid;
  gap: 8px;
}

.hidden {
  display: none;
}

input {
  border: 1px solid #c9d3e3;
  border-radius: 8px;
  padding: 10px;
  outline: none;
}

input:focus {
  border-color: var(--accent-2);
  box-shadow: 0 0 0 3px rgba(13, 148, 136, 0.14);
}

button {
  border: none;
  border-radius: 8px;
  padding: 10px 12px;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: #fff;
  font-weight: 600;
  cursor: pointer;
}

button.secondary {
  background: #e8edf3;
  color: #233042;
}

pre {
  background: #0b1220;
  color: #c4d6ff;
  border-radius: 10px;
  padding: 12px;
  overflow: auto;
  max-height: 260px;
}

.inline {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--muted);
}

.msg {
  min-height: 20px;
  color: var(--accent);
}
.msg.err {
  color: var(--err);
}