:root {
  color-scheme: light;
  --bg: #f5f7fb;
  --card: #ffffff;
  --text: #132238;
  --muted: #5d6b82;
  --primary: #276ef1;
  --primary-hover: #1456cb;
  --secondary: #e7eefc;
  --secondary-hover: #d7e4ff;
  --ghost: #f2f4f8;
  --ghost-hover: #e4e9f2;
  --good-bg: #edf9f1;
  --good-border: #9bd3ab;
  --warn-bg: #fff6e8;
  --warn-border: #f0c27b;
}

* { box-sizing: border-box; }
body {
  margin: 0;
  min-height: 100vh;
  display: grid;
  place-items: center;
  font-family: Arial, Helvetica, sans-serif;
  background: linear-gradient(135deg, #eef4ff 0%, var(--bg) 100%);
  color: var(--text);
  padding: 24px;
}
.card {
  width: min(92vw, 720px);
  background: var(--card);
  border-radius: 20px;
  padding: 40px;
  box-shadow: 0 24px 60px rgba(19, 34, 56, 0.12);
}
.eyebrow {
  display: inline-block;
  margin-bottom: 16px;
  color: var(--primary);
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  font-size: 12px;
}
h1, h2 {
  margin: 0 0 12px;
  line-height: 1.15;
}
h1 { font-size: clamp(28px, 5vw, 42px); }
h2 { font-size: 18px; }
p {
  margin: 0 0 20px;
  color: var(--muted);
  font-size: 18px;
  line-height: 1.6;
}
.panel {
  border: 1px solid transparent;
  border-radius: 16px;
  padding: 18px 18px 2px;
  margin: 0 0 24px;
}
.good {
  background: var(--good-bg);
  border-color: var(--good-border);
}
.warning {
  background: var(--warn-bg);
  border-color: var(--warn-border);
}
.actions {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  align-items: center;
}
.stack {
  flex-direction: column;
  align-items: stretch;
}
.button {
  display: inline-block;
  padding: 14px 22px;
  border-radius: 999px;
  background: var(--primary);
  color: white;
  text-decoration: none;
  font-weight: 700;
  text-align: center;
}
.button:hover { background: var(--primary-hover); }
.secondary {
  background: var(--secondary);
  color: var(--text);
}
.secondary:hover { background: var(--secondary-hover); }
.ghost {
  background: var(--ghost);
  color: var(--text);
}
.ghost:hover { background: var(--ghost-hover); }
.link {
  color: var(--primary);
  text-decoration: none;
  font-weight: 700;
}
code {
  background: #eef3ff;
  padding: 2px 8px;
  border-radius: 999px;
}