*,
*::before,
*::after {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: Georgia, "Times New Roman", serif;
  font-size: 16px;
  line-height: 1.6;
  color: #2c2c2c;
  background: #e8e4dc;
}

a {
  color: #3d5a4c;
}

a:hover {
  color: #1f3329;
}

header {
  background: #3d5a4c;
  color: #f5f2eb;
  padding: 1rem 2rem;
  border-bottom: 3px solid #2a3f35;
}

header h1 {
  margin: 0;
  font-size: 1.35rem;
  font-weight: normal;
  letter-spacing: 0.04em;
}

header p {
  margin: 0.25rem 0 0;
  font-size: 0.85rem;
  opacity: 0.85;
}

nav {
  background: #d4cfc4;
  border-bottom: 1px solid #b8b2a6;
  padding: 0.5rem 2rem;
}

nav a {
  margin-right: 1.5rem;
  text-decoration: none;
  font-size: 0.95rem;
}

nav a.active {
  font-weight: bold;
  text-decoration: underline;
}

main {
  max-width: 720px;
  margin: 2rem auto;
  padding: 0 1.5rem 3rem;
}

.card {
  background: #f5f2eb;
  border: 1px solid #c9c3b8;
  padding: 2rem;
  box-shadow: 2px 2px 0 #b8b2a6;
}

.card h2 {
  margin-top: 0;
  font-size: 1.2rem;
  font-weight: normal;
  border-bottom: 1px solid #c9c3b8;
  padding-bottom: 0.5rem;
}

label {
  display: block;
  margin-bottom: 0.35rem;
  font-size: 0.9rem;
}

input[type="text"],
input[type="password"] {
  width: 100%;
  max-width: 320px;
  padding: 0.45rem 0.5rem;
  border: 1px solid #a8a196;
  background: #fff;
  font-family: inherit;
  font-size: 1rem;
  margin-bottom: 1rem;
}

button[type="submit"] {
  padding: 0.5rem 1.5rem;
  background: #3d5a4c;
  color: #f5f2eb;
  border: 1px solid #2a3f35;
  font-family: inherit;
  font-size: 0.95rem;
  cursor: pointer;
}

button[type="submit"]:disabled {
  opacity: 0.6;
  cursor: wait;
}

.alert {
  display: none;
  margin-top: 1rem;
  padding: 0.75rem 1rem;
  background: #f0dede;
  border: 1px solid #c9a0a0;
  color: #5c2a2a;
  font-size: 0.9rem;
}

.alert.visible {
  display: block;
}

.note {
  margin-top: 1.5rem;
  font-size: 0.85rem;
  color: #5a5a5a;
}

article h3 {
  font-size: 1rem;
  margin: 1.5rem 0 0.5rem;
}

article ul,
article ol {
  padding-left: 1.4rem;
}

footer {
  text-align: center;
  font-size: 0.8rem;
  color: #6a6a6a;
  padding: 2rem 1rem;
  border-top: 1px solid #c9c3b8;
  margin-top: 2rem;
}