:root {
  --bg: #faf9f7;
  --fg: #1f1d1a;
  --muted: #6b665e;
  --card: #ffffff;
  --border: #e4e0d8;
  --accent: #2f5d50;
  --user: #e9efe9;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #171614;
    --fg: #ece9e3;
    --muted: #9c968c;
    --card: #211f1c;
    --border: #34312c;
    --accent: #7fb8a4;
    --user: #24302b;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0 auto;
  max-width: 760px;
  min-height: 100dvh;
  display: flex;
  flex-direction: column;
  padding: 0 16px;
  background: var(--bg);
  color: var(--fg);
  font: 17px/1.6 Georgia, "Iowan Old Style", serif;
}

.back {
  align-self: flex-start;
  margin-top: 16px;
  color: var(--muted);
  font: 14px/1.4 system-ui, sans-serif;
  text-decoration: none;
}
.back:hover { color: var(--accent); }

header { padding: 16px 0 8px; }
h1 { margin: 0; font-size: 1.8rem; }
.disclosure { margin: 4px 0 0; color: var(--muted); font: 14px/1.4 system-ui, sans-serif; }

.intro {
  display: flex;
  gap: 20px;
  align-items: flex-start;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--border);
}
.intro p { margin: 8px 0 0; }
.avatar {
  flex-shrink: 0;
  width: 96px;
  height: 96px;
  border-radius: 50%;
  object-fit: cover;
}
.links {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 16px;
  margin: 12px 0 4px;
  font: 14px/1.4 system-ui, sans-serif;
}
.intro a { color: var(--accent); }

@media (max-width: 560px) {
  .intro { flex-direction: column; gap: 12px; }
  .avatar { width: 72px; height: 72px; }
}

main { flex: 1; padding: 16px 0; }

.msg { margin: 16px 0; }
.msg.user {
  margin-left: auto;
  max-width: 85%;
  width: fit-content;
  padding: 10px 14px;
  border-radius: 14px;
  background: var(--user);
  font-family: system-ui, sans-serif;
  font-size: 16px;
}
.msg.assistant p { margin: 0 0 0.8em; }
.msg.assistant.pending::after { content: "…"; color: var(--muted); }

.sources {
  margin: 4px 0 0;
  padding: 0;
  list-style: none;
  font: 13px/1.4 system-ui, sans-serif;
  color: var(--muted);
}
.sources li { margin: 2px 0; }
.sources a { color: var(--accent); }

form {
  position: sticky;
  bottom: 0;
  display: flex;
  gap: 8px;
  padding: 12px 0 20px;
  background: var(--bg);
}
textarea {
  flex: 1;
  resize: none;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--card);
  color: var(--fg);
  font: 16px/1.4 system-ui, sans-serif;
}
button {
  padding: 0 18px;
  border: 0;
  border-radius: 10px;
  background: var(--accent);
  color: var(--bg);
  font: 600 15px system-ui, sans-serif;
  cursor: pointer;
}
button:disabled { opacity: 0.5; cursor: default; }