:root {
  --bg: #f7f8fa;
  --surface: #ffffff;
  --text: #132033;
  --muted: #4f6278;
  --line: #dbe2ea;
  --brand: #1163d9;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: "Segoe UI", Tahoma, Geneva, Verdana, sans-serif;
  background: var(--bg);
  color: var(--text);
}

.container {
  width: min(960px, 92vw);
  margin: 0 auto;
}

.site-header {
  background: var(--surface);
  border-bottom: 1px solid var(--line);
  padding: 0.75rem 0;
}

.row-between {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 1rem;
}

.row-gap {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.brand {
  text-decoration: none;
  color: var(--text);
  font-weight: 700;
}

a {
  color: var(--brand);
}

main {
  padding: 1.5rem 0;
}

.panel {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: 12px;
  padding: 1.25rem;
}

.narrow {
  max-width: 560px;
}

.actions {
  display: flex;
  gap: 0.75rem;
  margin-top: 1rem;
}

.button,
.link-button {
  display: inline-block;
  border: 1px solid var(--brand);
  background: var(--brand);
  color: #fff;
  padding: 0.55rem 0.9rem;
  border-radius: 8px;
  text-decoration: none;
  cursor: pointer;
  font: inherit;
}

.button.ghost {
  background: transparent;
  color: var(--brand);
}

.stack p {
  margin: 0 0 0.8rem;
}

.stack input {
  width: 100%;
  padding: 0.55rem;
  border: 1px solid var(--line);
  border-radius: 8px;
}

.messages {
  margin-bottom: 1rem;
}

.message {
  background: #e8f3ff;
  border: 1px solid #b7d6fa;
  padding: 0.6rem 0.8rem;
  border-radius: 8px;
}