* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Arial, sans-serif;
  color: #2a2a2a;
  background: #fafafa;
}
.bar {
  padding: 1rem 1.5rem;
  border-bottom: 1px solid #e5e5e5;
}
.mark {
  font-weight: 600;
  color: #6b6b6b;
  cursor: default;
  user-select: none;
}
.content {
  max-width: 640px;
  margin: 4rem auto;
  padding: 0 1.5rem;
}
.content h1 {
  font-size: 1.5rem;
}
.muted {
  color: #8a8a8a;
  font-size: 0.9rem;
}
.foot {
  text-align: center;
  color: #b5b5b5;
  font-size: 0.8rem;
  padding: 2rem 0;
}

.panel {
  position: fixed;
  inset: 0;
  background: rgba(20, 20, 20, 0.85);
  display: flex;
  align-items: center;
  justify-content: center;
}
.panel.hidden {
  display: none;
}
.panel form {
  background: #fff;
  padding: 2rem;
  border-radius: 10px;
  width: 280px;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}
.panel label {
  font-size: 0.85rem;
  color: #555;
}
.panel input {
  padding: 0.6rem;
  border: 1px solid #ccc;
  border-radius: 6px;
  font-size: 1rem;
}
.panel button {
  padding: 0.6rem;
  border: none;
  border-radius: 6px;
  background: #2a2a2a;
  color: #fff;
  font-size: 1rem;
  cursor: pointer;
}
.error {
  color: #c0392b;
  font-size: 0.85rem;
  margin: 0;
}
.error.hidden {
  display: none;
}