/* style.css */
body {
  background: #fdfdfd url('https://www.transparenttextures.com/patterns/notebook.png') repeat;
  font-family: 'Tahoma', 'Courier New', monospace;
  color: #333;
  margin: 0;
  padding: 0;
  line-height: 1.6;
}

header {
  background-color: #fff;
  border-bottom: 2px solid #999;
  padding: 1rem;
  text-align: center;
  position: sticky;
  top: 0;
  z-index: 10;
}

header h1 {
  font-size: 2rem;
  color: #333;
  font-weight: normal;
  margin: 0;
}

nav {
  margin-top: 0.5rem;
}

nav a {
  margin: 0 0.75rem;
  color: #005aff;
  text-decoration: underline;
  font-weight: normal;
}

nav a:hover {
  text-decoration: none;
  background: #f0f0ff;
  border-radius: 3px;
}

.container {
  max-width: 700px;
  margin: 2rem auto;
  background-color: rgba(255, 255, 255, 0.95);
  padding: 1.5rem;
  border: 1px solid #999;
  box-shadow: 4px 4px 0 #ccc;
  position: relative;
  z-index: 1;
}

.sidebar {
  position: fixed;
  top: 5rem;
  left: 1rem;
  width: 160px;
  padding: 1rem;
  background: rgba(255, 255, 255, 0.9);
  border: 1px solid #aaa;
  box-shadow: 3px 3px 0 #bbb;
  font-size: 0.9rem;
  z-index: 2;
}

.sidebar h3 {
  font-size: 1.1rem;
  margin-top: 0;
  border-bottom: 1px solid #999;
  padding-bottom: 0.25rem;
  color: #222;
}

.sidebar ul {
  list-style: none;
  padding: 0;
  margin: 0.5rem 0 0;
}

.sidebar li {
  margin-bottom: 0.5rem;
}

.sidebar a {
  color: #005aff;
  text-decoration: none;
}

.sidebar a:hover {
  text-decoration: underline;
  background: #eef;
}

h2, h3 {
  font-family: 'Tahoma', sans-serif;
  color: #222;
  border-left: 5px solid #666;
  padding-left: 0.5rem;
}

article {
  margin-bottom: 2rem;
  padding: 1rem;
  background: #fdfdfd;
  border: 1px dotted #aaa;
  box-shadow: inset 0 0 4px rgba(0,0,0,0.05);
}

article h3 {
  margin-top: 0;
}

em {
  color: #666;
  font-style: italic;
}

.guestbook-form input,
.guestbook-form textarea {
  width: 100%;
  padding: 0.5rem;
  margin: 0.5rem 0;
  border: 1px solid #aaa;
  font-family: inherit;
  background: #f9f9f9;
  color: #222;
}

.guestbook-form button {
  padding: 0.5rem 1rem;
  background-color: #333;
  color: #fff;
  border: none;
  cursor: pointer;
  font-weight: normal;
  font-size: 1rem;
}

.guestbook-form button:hover {
  background-color: #555;
}

.messages p {
  margin: 0.5rem 0;
  padding-left: 1rem;
  border-left: 3px solid #999;
  font-family: monospace;
  color: #444;
  background: #fcfcfc;
  border-radius: 3px;
  padding: 0.75rem;
  box-shadow: inset 0 0 3px rgba(0,0,0,0.05);
}

.messages p:not(:last-child) {
  margin-bottom: 1rem;
}