:root {
  --brand: #0056a3;
  --bg: #ffffff;
  --msg-user: #d0e6ff;
  --msg-bot: #e6f3e6;
  --border: #d9d9d9;
}

#chatWindow {
  width: 360px;
  max-width: 100%;
  /* Altura fluida: mínimo 420px, preferible 70vh, máximo 640px */
  height: clamp(420px, 70vh, 640px);
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: 12px;
  display: flex;
  flex-direction: column;
  position: fixed;
  bottom: 90px;
  left: 24px;
  box-shadow: 0 8px 28px rgba(0,0,0,.18);
  z-index: 9999;
  font-family: ui-sans-serif, system-ui, -apple-system, "Segoe UI", Roboto, Arial, "Noto Sans", "Apple Color Emoji", "Segoe UI Emoji";
}

#chatHeader {
  background: var(--brand);
  color: #fff;
  padding: 12px;
  border-top-left-radius: 12px;
  border-top-right-radius: 12px;
  font-weight: 600;
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 52px;
}

#brand {
  display: flex;
  align-items: center;
  gap: 8px;
}

#chatHeader #chatLogo {
  width: 32px !important;
  height: 32px !important;
  border-radius: 50%;
  background: #fff;
  object-fit: cover;
  box-shadow: 0 0 0 2px rgba(255,255,255,0.45);
  display: inline-block;
  flex: 0 0 32px;
}

#chatBox {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 12px;
  overflow-y: auto;
  background-color: #f9fafb;
  flex: 1;
}

.row {
  display: flex;
  align-items: flex-start;
  gap: 8px;
}

.row.bot {
  align-self: flex-start;
}

.mensaje {
  display: inline-block;
  margin: 0;
  padding: 10px 12px;
  border-radius: 10px;
  max-width: 90%;
  line-height: 1.45;
  /* ✅ Mantiene TODO el contenido dentro de la burbuja */
  overflow-wrap: anywhere;        /* corta palabras/urls largas */
  word-break: break-word;
  white-space: pre-wrap;          /* respeta saltos de línea */
  box-shadow: 0 1px 0 rgba(0,0,0,.04);
}

.user {
  background-color: var(--msg-user);
  align-self: flex-end;
  text-align: right;
}

.bot {
  background-color: var(--msg-bot);
  align-self: flex-start;
  text-align: left;
}

.avatar {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  object-fit: cover;
  box-shadow: 0 1px 0 rgba(0,0,0,.06);
  background: #fff;
  flex: 0 0 32px;
}

.mensaje a {
  text-decoration: underline;
}

#inputContainer {
  display: flex;
  align-items: stretch;
  gap: 8px;
  padding: 10px;
  border-top: 1px solid var(--border);
  background: #fff;
  /* Evitar superposición con notches/barras en móviles */
  padding-bottom: calc(10px + env(safe-area-inset-bottom, 0px));
}

#userInput {
  flex: 1;
  padding: 10px 12px;
  resize: none;
  font-size: 14px;
  border-radius: 8px;
  border: 1px solid var(--border);
  outline: none;
}

#userInput:focus {
  border-color: var(--brand);
  box-shadow: 0 0 0 3px rgba(0,86,163,.15);
}

#enviarBtn {
  padding: 10px 14px;
  border: none;
  border-radius: 8px;
  background-color: var(--brand);
  color: white;
  font-weight: 600;
  cursor: pointer;
}

/* Accesibilidad: enfoque visible */
button:focus-visible, #userInput:focus-visible {
  outline: 3px solid rgba(0,86,163,.4);
  outline-offset: 2px;
}

/* ✅ Responsive (móvil): pantalla completa horizontal */
@media (max-width: 520px) {
  #chatWindow {
    width: 100vw;
    /* usar casi todo el alto, respetando safe area */
    height: calc(100vh - 24px - env(safe-area-inset-bottom, 0px));
    right: 0;
    left: 0;
    bottom: 0;
    border-radius: 12px 12px 0 0;
  }
}

/* Eliminado modo oscuro: mantener esquema claro consistente */