:root {
  --bg: #FFFFEA;
  --fg: #000000;
  --fg-link: #0645ad;
  --fg-link-visited: #551a8b;
  --hl: #EAFFFF;
}

/* global */
body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: serif;
  font-size: 16px;
  line-height: 1.2;
}

/* header */
header {
  padding: 20px;
}

header h1 {
  margin: 0;
  font-size: 35px;
  font-weight: normal;
  font-style: italic;
}

header a,
header a:visited {
  color: var(--fg);
  text-decoration: none;
}

header a:hover {
  background: none;
  color: var(--fg);
}

header a:focus-visible {
  background: none;
  color: var(--fg);
  outline: 1px solid var(--fg-link);
  outline-offset: 2px;
}

/* sidebar */
#side-bar {
  position: absolute;
  top: 80px;
  left: 0;
  width: 200px;
  padding-left: 20px;
}

.side-title {
  font-size: 25px;
  margin: 20px 0 8px 0;
  color: var(--fg);
}

#side-bar ul {
  margin: 0 0 0 20px;
  padding: 0px;
  list-style: none;
}

#side-bar li {
  margin: 6px 0;
}

/* links */
a {
  color: var(--fg-link);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 0.12em;
  padding: 1px 2px;
}

a:visited {
  color: var(--fg-link-visited);
}

a:hover {
  background: var(--hl);
  color: var(--fg-link);
}

a:focus-visible {
  background: var(--hl);
  color: var(--fg-link);
}

/* article */
article {
  margin: 80px 0 0 0;
  max-width: 800px;
}

article img {
  display: block;
  max-width: 100%;
  height: auto;
  margin: 1.5em auto;
}

h3 {
  margin-top: 30px;
  font-size: 25px;
  color: var(--fg);
  font-weight: normal;
}

/* footer */
footer {
  padding-top: 80px;
  font-style: italic;
  font-size: 17px;
}

/* article + footer alignment */
article,
footer {
  margin-left: 240px;
  margin-top: 0px;
}

/* chat widget */
#chat-widget {
  position: fixed;
  right: 20px;
  bottom: 20px;
  width: 320px;
  font-size: 14px;
}

#chat-widget details {
  background: var(--bg);
  border: 1px solid var(--fg);
  padding: 12px;
  box-sizing: border-box;
}

#chat-widget summary {
  cursor: pointer;
  color: var(--fg);
  font-size: 18px;
  font-style: italic;
  list-style: none;
}

#chat-widget summary::-webkit-details-marker {
  display: none;
}

#chat-widget summary::before {
  content: "[−] ";
  color: var(--fg);
  background: var(--hl);
}

#chat-widget details:not([open]) summary::before {
  content: "[+] ";
}

#chat-messages {
  height: 220px;
  overflow-y: auto;
  border: 1px solid var(--fg);
  padding: 8px;
  margin: 10px 0;
  white-space: pre-wrap;
  background: var(--bg);
}

#chat-messages p {
  margin: 0 0 10px 0;
}

#chat-messages strong {
  color: var(--fg);
  background: var(--hl);
  padding: 0 2px;
}

#chat-form {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

#chat-form label {
  position: absolute;
  left: -9999px;
}

#chat-input {
  flex: 1;
  min-width: 200px;
  background: transparent;
  color: var(--fg);
  border: 1px solid var(--fg);
  padding: 6px;
  font-family: inherit;
  font-size: 14px;
}

#chat-input::placeholder {
  color: var(--fg);
  opacity: 0.7;
}

#chat-form button {
  background: transparent;
  color: var(--fg);
  border: 1px solid var(--fg);
  padding: 6px 10px;
  font-family: inherit;
  cursor: pointer;
}

#chat-form button:hover {
  background: var(--hl);
  color: var(--fg);
}

/* chat: api key overlay */
#key-overlay {
  background: var(--bg);
  border: 1px solid var(--fg);
  padding: 12px;
  margin: 10px 0;
}

#key-overlay p {
  margin: 0 0 8px 0;
  font-size: 13px;
  line-height: 1.4;
}

#key-input {
  width: 100%;
  box-sizing: border-box;
  background: transparent;
  color: var(--fg);
  border: 1px solid var(--fg);
  padding: 6px;
  font-family: monospace;
  font-size: 13px;
  margin-bottom: 8px;
}

.key-buttons {
  display: flex;
  gap: 6px;
}

.key-buttons button {
  background: transparent;
  color: var(--fg);
  border: 1px solid var(--fg);
  padding: 4px 10px;
  font-family: inherit;
  cursor: pointer;
  font-size: 13px;
}

.key-buttons button:hover {
  background: var(--hl);
}

/* chat: key status bar */
#key-status {
  font-size: 12px;
  padding: 6px 0;
  border-bottom: 1px solid var(--fg);
  margin-bottom: 4px;
}

#key-status code {
  font-size: 11px;
  background: var(--hl);
  padding: 1px 3px;
}

/* chat: thinking indicator */
.chat-thinking p {
  font-style: italic;
  opacity: 0.7;
}

/* chat message articles within the widget */
#chat-messages article.chat-msg {
  margin: 0 0 8px 0;
  max-width: none;
}

#chat-messages article.chat-msg h3 {
  margin: 0 0 2px 0;
  font-size: 13px;
  font-weight: bold;
}

#chat-messages article.chat-msg p {
  margin: 0;
}

#chat-messages article.chat-msg nav {
  font-size: 12px;
  margin-top: 4px;
}

#chat-messages article.chat-msg nav ul {
  margin: 2px 0 0 16px;
  padding: 0;
}

/* keep code example styling intact */
pre {
  background: #2b2f3a;
  padding: 16px;
  overflow-x: auto;
  border: 1px solid var(--fg);
}

code {
  font-family: monospace;
  font-size: 14px;
}

pre code {
  background: none;
  padding: 0;
}