body {
  font-family: Verdana, sans-serif;
  margin: 0;
  padding: 0;
  height: 100vh;
  width: 100vw;
  display: flex;
  justify-content: center;
  align-items: center;
  background-color: #f0f2f5;
  overflow: hidden; /* disable browser scroll */
}

/* Chat panel (fixed 90% size) */
.chat-panel {
  width: 90vw;
  height: 90vh;
  background-color: #fff;
  box-shadow: 0 0 20px rgba(0,0,0,0.25);
  border-radius: 12px;
  display: flex;
  flex-direction: column;
  overflow: hidden;
}

/* Header */
.chat-header {
  background-color: #007bff;
  color: #fff;
  padding: 15px;
  border-top-left-radius: 12px;
  border-top-right-radius: 12px;
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.header-buttons { display: flex; gap: 8px; align-items: center; }
.header-btn {
  background: #fff;
  color: #007bff;
  border: none;
  border-radius: 5px;
  padding: 6px 12px;
  cursor: pointer;
  font-size: 14px;
  font-weight: bold;
}
.header-btn:hover { background-color: #e2e6ea; }
.upload-btn { position: relative; overflow: hidden; }
.upload-btn input {
  position: absolute;
  left: 0;
  top: 0;
  opacity: 0;
  width: 100%;
  height: 100%;
  cursor: pointer;
}
.close-btn {
  background: none;
  border: none;
  color: #fff;
  font-size: 24px;
  cursor: pointer;
}

/* Messages area (scroll inside) */
.chat-messages {
  flex-grow: 1;
  padding: 20px;
  overflow-y: auto;
  background-color: #e9ecef;
  border-bottom: 1px solid #dee2e6;
}
.message {
  margin-bottom: 12px;
  padding: 10px 14px;
  border-radius: 15px;
  max-width: 80%;
  word-wrap: break-word;
  overflow-wrap: break-word;
  white-space: pre-wrap;
}
.message.user {
  background-color: #007bff;
  color: #fff;
  align-self: flex-end;
  margin-left: auto;
  font-size: 14px;
  line-height: 1.5;
}
.message.bot {
  background-color: #f8f9fa;
  color: #343a40;
  align-self: flex-start;
  margin-right: auto;
  border: 1px solid #dee2e6;
  font-size: 13px;   /* smaller font for results */
  line-height: 1.4;
}

/* Input bar */
.chat-input {
  display: flex;
  flex-direction: column;
  padding: 15px;
  border-top: 1px solid #dee2e6;
  background-color: #f8f9fa;
}
.chat-input input[type="text"] {
  flex-grow: 1;
  padding: 12px;
  border: 1px solid #ced4da;
  border-radius: 20px;
  margin-top: 10px;
  margin-bottom: 5px;
  font-size: 14px;
}
.chat-input button {
  padding: 12px 16px;
  background-color: #28a745;
  color: #fff;
  border: none;
  border-radius: 20px;
  cursor: pointer;
  font-weight: bold;
}
.chat-input button:hover { background-color: #218838; }

/* Submission buttons */
.submission-buttons {
  display: flex;
  gap: 12px;
  margin-bottom: 10px;
}
.submission-btn {
  flex: 1;
  padding: 14px;
  background-color: #007bff;
  color: white;
  font-weight: bold;
  border: none;
  border-radius: 10px;
  cursor: pointer;
  font-size: 14px;
  display: flex;
  align-items: center;
  justify-content: center;
}
.submission-btn:hover {
  background-color: #0056b3;
}

/* Headnotes */
.headnote-item {
  margin: 8px 0;
  padding: 8px;
  background: #f9f9f9;
  border-left: 3px solid #007bff;
  border-radius: 4px;
}