body {
  margin: 0;
  font-family: Arial, sans-serif;
  background: #f7f8fb;
  color: #1f2937;
}

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

header {
  background: #0f172a;
  color: #f9fafb;
  padding: 1rem 0;
  margin-bottom: 2rem;
}

.nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.nav a,
.nav button {
  color: #f9fafb;
  text-decoration: none;
  background: transparent;
  border: 0;
  cursor: pointer;
  margin-left: 1rem;
  font-size: 0.95rem;
}

.logo {
  font-weight: 700;
  margin-left: 0;
}

.inline-form {
  display: inline;
}

.card {
  background: #ffffff;
  border-radius: 10px;
  padding: 1.4rem;
  box-shadow: 0 2px 14px rgba(15, 23, 42, 0.08);
}

.button,
button {
  display: inline-block;
  background: #2563eb;
  color: #ffffff;
  border: 0;
  border-radius: 6px;
  padding: 0.55rem 0.9rem;
  text-decoration: none;
}

button:hover,
.button:hover {
  background: #1e4ab8;
}

.messages {
  list-style: none;
  padding: 0;
}

.message {
  padding: 0.65rem 0.75rem;
  border-radius: 6px;
  margin-bottom: 0.5rem;
}

.message.success {
  background: #dcfce7;
}

.message.info {
  background: #e0f2fe;
}

.message.warning {
  background: #fef3c7;
}