:root {
  --franzi-primary: #2563eb;
  --franzi-secondary: #1e40af;
  --franzi-bg: #ffffff;
  --franzi-text: #1f2937;
  --franzi-text-light: #6b7280;
  --franzi-border: #e5e7eb;
  --franzi-agent-bg: #f3f4f6;
  --franzi-user-bg: #2563eb;
  --franzi-user-text: #ffffff;
  --franzi-font: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --franzi-radius: 12px;
}

*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html,
body {
  height: 100%;
}

body {
  display: flex;
  flex-direction: column;
  font-family: var(--franzi-font);
  background-color: var(--franzi-bg);
  color: var(--franzi-text);
  font-size: 14px;
  line-height: 1.5;
}

/* ── Header ───────────────────────────────────────────────── */

.chat-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 16px;
  background-color: var(--franzi-primary);
  color: var(--franzi-user-text);
  flex-shrink: 0;
}

.chat-header h1 {
  font-size: 16px;
  font-weight: 600;
  letter-spacing: 0.01em;
}

.chat-header .reset-btn {
  background: transparent;
  border: 1px solid rgba(255, 255, 255, 0.4);
  color: var(--franzi-user-text);
  border-radius: 6px;
  padding: 4px 10px;
  font-size: 12px;
  cursor: pointer;
  font-family: var(--franzi-font);
  transition: background 0.15s;
}

.chat-header .reset-btn:hover {
  background: rgba(255, 255, 255, 0.15);
}

/* ── Message list ─────────────────────────────────────────── */

.chat-messages {
  flex: 1;
  overflow-y: auto;
  padding: 16px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

/* ── Individual message bubbles ───────────────────────────── */

.message {
  max-width: 80%;
  padding: 10px 14px;
  border-radius: var(--franzi-radius);
  word-break: break-word;
  white-space: pre-wrap;
  font-size: 14px;
  line-height: 1.55;
}

.message.agent {
  align-self: flex-start;
  background-color: var(--franzi-agent-bg);
  color: var(--franzi-text);
  border-bottom-left-radius: 4px;
}

.message.user {
  align-self: flex-end;
  background-color: var(--franzi-user-bg);
  color: var(--franzi-user-text);
  border-bottom-right-radius: 4px;
}

.message.typing {
  align-self: flex-start;
  background-color: var(--franzi-agent-bg);
  color: var(--franzi-text-light);
  font-style: italic;
  border-bottom-left-radius: 4px;
}

/* ── Input area ───────────────────────────────────────────── */

.chat-input-area {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 12px 16px;
  border-top: 1px solid var(--franzi-border);
  background-color: var(--franzi-bg);
  flex-shrink: 0;
}

.chat-input-area input {
  flex: 1;
  border: 1px solid var(--franzi-border);
  border-radius: 8px;
  padding: 9px 13px;
  font-size: 14px;
  font-family: var(--franzi-font);
  color: var(--franzi-text);
  background-color: var(--franzi-bg);
  outline: none;
  transition: border-color 0.15s;
}

.chat-input-area input:focus {
  border-color: var(--franzi-primary);
}

.chat-input-area input::placeholder {
  color: var(--franzi-text-light);
}

.chat-input-area button {
  background-color: var(--franzi-primary);
  color: var(--franzi-user-text);
  border: none;
  border-radius: 8px;
  padding: 9px 16px;
  font-size: 14px;
  font-family: var(--franzi-font);
  font-weight: 500;
  cursor: pointer;
  transition: background 0.15s;
  white-space: nowrap;
}

.chat-input-area button:hover {
  background-color: var(--franzi-secondary);
}

.chat-input-area button:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

/* ── Responsive ───────────────────────────────────────────── */

@media (max-width: 480px) {
  .message {
    max-width: 90%;
  }
}