/* ===========================================================
   AI Chat Widget — demo 版（UI 完整、回覆為預錄假對話）
   =========================================================== */

.chat-launcher {
  position: fixed;
  right: var(--space-5);
  bottom: var(--space-5);
  z-index: var(--z-overlay);
  width: 60px;
  height: 60px;
  border-radius: 50%;
  background: var(--color-accent-primary);
  color: var(--color-text-inverse);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-lg);
  cursor: pointer;
  transition: all var(--transition-base);
}
.chat-launcher:hover {
  transform: scale(1.08);
  background: var(--color-accent-hover);
}
.chat-launcher__icon {
  width: 28px;
  height: 28px;
}
.chat-launcher__pulse {
  position: absolute;
  inset: 0;
  border-radius: 50%;
  background: var(--color-accent-primary);
  opacity: 0.4;
  animation: pulse 2s ease-out infinite;
  pointer-events: none;
}
@keyframes pulse {
  0%   { transform: scale(1);   opacity: 0.4; }
  100% { transform: scale(1.5); opacity: 0;   }
}

/* 開啟後隱藏 launcher */
.chat-launcher.is-hidden { display: none; }

.chat-window {
  position: fixed;
  right: var(--space-5);
  bottom: var(--space-5);
  z-index: var(--z-modal);
  width: calc(100vw - 2 * var(--space-5));
  max-width: 380px;
  height: 560px;
  max-height: calc(100vh - 2 * var(--space-5));
  background: var(--color-bg-primary);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  display: none;
  flex-direction: column;
  overflow: hidden;
  border: 1px solid var(--color-border-soft);
}
.chat-window.is-open {
  display: flex;
  animation: slideUp 250ms ease-out;
}
@keyframes slideUp {
  from { opacity: 0; transform: translateY(20px); }
  to   { opacity: 1; transform: translateY(0); }
}

.chat-window__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-4) var(--space-5);
  background: linear-gradient(135deg, var(--color-accent-primary), var(--color-accent-hover));
  color: var(--color-text-inverse);
}
.chat-window__header-info {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}
.chat-window__avatar {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.25);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--fs-md);
}
.chat-window__title {
  font-size: var(--fs-base);
  font-weight: var(--fw-semibold);
  margin-bottom: 2px;
}
.chat-window__status {
  font-size: var(--fs-xs);
  opacity: 0.85;
  display: flex;
  align-items: center;
  gap: var(--space-2);
}
.chat-window__status::before {
  content: "";
  width: 6px; height: 6px;
  border-radius: 50%;
  background: #6BD49A;
}
.chat-window__close {
  width: 32px; height: 32px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-inverse);
  opacity: 0.85;
}
.chat-window__close:hover { background: rgba(255, 255, 255, 0.15); opacity: 1; }

.chat-window__body {
  flex: 1;
  padding: var(--space-5);
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  background: var(--color-bg-secondary);
}
.chat-msg {
  max-width: 80%;
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-lg);
  font-size: var(--fs-sm);
  line-height: var(--lh-snug);
  animation: msgIn 200ms ease-out;
}
@keyframes msgIn {
  from { opacity: 0; transform: translateY(8px); }
  to   { opacity: 1; transform: translateY(0); }
}
.chat-msg--bot {
  align-self: flex-start;
  background: var(--color-bg-primary);
  color: var(--color-text-primary);
  border-bottom-left-radius: 4px;
  box-shadow: var(--shadow-sm);
}
.chat-msg--user {
  align-self: flex-end;
  background: var(--color-accent-primary);
  color: var(--color-text-inverse);
  border-bottom-right-radius: 4px;
}
.chat-msg__time {
  display: block;
  font-size: 10px;
  margin-top: 4px;
  opacity: 0.6;
}

.chat-quick-replies {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  padding: 0 var(--space-5);
  margin-top: var(--space-3);
}
.chat-quick-reply {
  padding: var(--space-2) var(--space-3);
  background: var(--color-bg-primary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-pill);
  font-size: var(--fs-xs);
  color: var(--color-text-primary);
  cursor: pointer;
  transition: all var(--transition-fast);
}
.chat-quick-reply:hover {
  background: var(--color-accent-bg);
  border-color: var(--color-accent-primary);
  color: var(--color-accent-primary);
}

.chat-window__footer {
  padding: var(--space-4) var(--space-5);
  border-top: 1px solid var(--color-border-soft);
  background: var(--color-bg-primary);
}
.chat-input-wrap {
  display: flex;
  gap: var(--space-2);
  align-items: center;
}
.chat-input {
  flex: 1;
  padding: var(--space-3) var(--space-4);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-pill);
  font-family: var(--font-sans);
  font-size: var(--fs-sm);
  outline: none;
  transition: border-color var(--transition-fast);
  background: var(--color-bg-primary);
}
.chat-input:focus { border-color: var(--color-accent-primary); }
.chat-send {
  width: 40px; height: 40px;
  border-radius: 50%;
  background: var(--color-accent-primary);
  color: var(--color-text-inverse);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background var(--transition-base);
}
.chat-send:hover { background: var(--color-accent-hover); }
.chat-send:disabled { background: var(--color-text-muted); cursor: not-allowed; }

.chat-disclaimer {
  text-align: center;
  font-size: 10px;
  color: var(--color-text-muted);
  margin-top: var(--space-2);
}

/* Typing indicator */
.chat-typing {
  display: flex;
  align-self: flex-start;
  gap: 4px;
  padding: var(--space-3) var(--space-4);
  background: var(--color-bg-primary);
  border-radius: var(--radius-lg);
  border-bottom-left-radius: 4px;
  box-shadow: var(--shadow-sm);
}
.chat-typing span {
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--color-text-muted);
  animation: typing 1.4s ease-in-out infinite;
}
.chat-typing span:nth-child(2) { animation-delay: 0.2s; }
.chat-typing span:nth-child(3) { animation-delay: 0.4s; }
@keyframes typing {
  0%, 60%, 100% { opacity: 0.3; transform: translateY(0); }
  30% { opacity: 1; transform: translateY(-4px); }
}