* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;
  background: #f4f7f5;
  color: #1c2b22;
  line-height: 1.5;
}
.top {
  background: #0f5132;
  color: #fff;
  padding: 28px 20px 22px;
  text-align: center;
}
.top h1 { margin: 0 0 6px; font-size: 30px; }
.tagline { margin: 0; opacity: 0.9; font-size: 16px; }
main { max-width: 720px; margin: 0 auto; padding: 18px 14px 30px; }
.card {
  background: #fff;
  border: 1px solid #dbe5dd;
  border-radius: 12px;
  padding: 18px;
  margin-bottom: 16px;
}
.card h2 { margin: 0 0 8px; font-size: 19px; }
.hint { color: #4c5a51; font-size: 14px; margin: 0 0 14px; }
.upload-btn {
  display: inline-block;
  background: #0f5132;
  color: #fff;
  padding: 10px 20px;
  border-radius: 8px;
  cursor: pointer;
  font-weight: 600;
}
.link-btn {
  background: none;
  border: none;
  color: #0f5132;
  text-decoration: underline;
  cursor: pointer;
  font-size: 14px;
  margin-left: 10px;
}
.doc-info { margin: 12px 0 0; font-size: 14px; color: #2c4636; }
.btn-row { display: flex; gap: 10px; flex-wrap: wrap; }
button {
  background: #0f5132;
  color: #fff;
  border: none;
  padding: 10px 16px;
  border-radius: 8px;
  cursor: pointer;
  font-size: 15px;
  font-weight: 600;
}
button:disabled { background: #9db3a5; cursor: not-allowed; }
.messages {
  border: 1px solid #dbe5dd;
  border-radius: 8px;
  padding: 12px;
  min-height: 140px;
  max-height: 420px;
  overflow-y: auto;
  background: #fbfdfc;
}
.messages p { margin: 0 0 10px; white-space: pre-wrap; }
.placeholder { color: #6a7a70; }
.msg-user { font-weight: 600; }
.msg-ai { background: #eef6f0; border-radius: 8px; padding: 10px; }
.msg-error { color: #9b1c1c; }
.chat-input-row { display: flex; gap: 8px; margin-top: 12px; }
.chat-input-row input {
  flex: 1;
  padding: 10px 12px;
  border: 1px solid #b9c9bd;
  border-radius: 8px;
  font-size: 15px;
}
.status { font-size: 14px; color: #4c5a51; min-height: 20px; margin: 8px 0 0; }
footer { text-align: center; color: #4c5a51; font-size: 14px; padding: 0 16px 30px; }
footer a { color: #0f5132; }