:root {
  --to-primary: #0078ff;
  --to-primary-dark: #0055b8;
  --to-text-main: #222;
  --to-bot-bubble: #e6f0ff;
  --to-user-bubble: #0078ff;
  --to-user-bubble-text: #ffffff;
  --to-shadow: rgba(15, 23, 42, 0.35);
  --to-shadow-strong: rgba(15, 23, 42, 0.45);
}

#to-chatbot-button {
  position: fixed;
  bottom: 20px;
  right: 20px;
  width: 60px;
  height: 60px;
  border-radius: 50%;
  background: var(--to-primary);
  color: #fff;
  font-size: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  box-shadow: 0 10px 30px var(--to-shadow);
  z-index: 99999;
  transition: transform 0.18s ease, box-shadow 0.18s ease, background 0.18s ease;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, Arial, sans-serif;
}

#to-chatbot-button:hover {
  transform: translateY(-2px);
  background: var(--to-primary-dark);
  box-shadow: 0 14px 35px rgba(15, 23, 42, 0.4);
}

#to-chatbot-window {
  position: fixed;
  width: 380px;
  height: 520px;
  min-width: 260px;
  min-height: 260px;
  max-width: 90vw;
  max-height: 85vh;
  background: #fff;
  border-radius: 16px;
  box-shadow: 0 16px 40px var(--to-shadow-strong);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  z-index: 99999;
}

#to-chatbot-window.hidden {
  display: none;
}

#to-chatbot-header {
  background: linear-gradient(120deg, var(--to-primary), var(--to-primary-dark));
  color: #fff;
  padding: 10px 14px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-weight: 600;
  font-size: 0.95rem;
  user-select: none;
  cursor: grab;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, Arial, sans-serif;
}

#to-chatbot-header.dragging {
  cursor: grabbing;
}

#to-chatbot-header-title {
  display: flex;
  align-items: center;
  gap: 8px;
}

#to-chatbot-close {
  background: none;
  border: none;
  color: #fff;
  font-size: 18px;
  cursor: pointer;
  padding: 2px 4px;
}

#to-chatbot-messages {
  flex: 1;
  padding: 10px 10px 12px;
  overflow-y: auto;
  background: #f5f7fb;
  display: flex;
  flex-direction: column;
  gap: 6px;
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, Arial, sans-serif;
}

.to-message-row {
  display: flex;
  margin-top: 4px;
}

.to-message-row.bot {
  justify-content: flex-start;
}

.to-message-row.user {
  justify-content: flex-end;
}

.to-message-bubble {
  max-width: 85%;
  padding: 8px 10px;
  border-radius: 14px;
  font-size: 14px;
  line-height: 1.45;
  word-wrap: break-word;
  box-shadow: 0 2px 6px rgba(15, 23, 42, 0.15);
}

.to-message-row.bot .to-message-bubble {
  background: var(--to-bot-bubble);
  color: var(--to-text-main);
  border-bottom-left-radius: 4px;
}

.to-message-row.user .to-message-bubble {
  background: var(--to-user-bubble);
  color: var(--to-user-bubble-text);
  border-bottom-right-radius: 4px;
}

#to-chatbot-input-area {
  display: flex;
  border-top: 1px solid #e0e4f0;
  background: #fff;
  padding: 6px;
  gap: 6px;
  align-items: center;
}

#to-chatbot-input {
  flex: 1;
  padding: 8px 10px;
  border-radius: 999px;
  border: 1px solid #d0d7eb;
  outline: none;
  font-size: 14px;
}

#to-chatbot-input:focus {
  border-color: var(--to-primary);
  box-shadow: 0 0 0 2px rgba(0,120,255,0.15);
}

#to-chatbot-send {
  background: var(--to-primary);
  color: #fff;
  border: none;
  border-radius: 50%;
  width: 34px;
  height: 34px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  font-size: 16px;
}

#to-chatbot-send:hover {
  background: var(--to-primary-dark);
}

.to-message-row.bot .to-message-bubble a {
  color: #0b66d3;
  text-decoration: underline;
}

.to-message-row.bot .to-message-bubble code {
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  padding: 0 4px;
  border-radius: 4px;
  background: #eef2ff;
}

.to-message-row.bot .to-message-bubble pre {
  overflow: auto;
  padding: 10px;
  border-radius: 10px;
  background: #0f172a;
  color: #e2e8f0;
}

.to-message-row.bot .to-message-bubble pre code {
  background: transparent;
  padding: 0;
}

@media (max-width: 600px) {
  #to-chatbot-window {
    width: 320px;
    height: 460px;
  }
}