/* 底 = MP4 全屏；上 = 圖1+對話框（可拖動） */

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.chat-page {
  position: relative;
  width: 100vw;
  height: 100vh;
  overflow: hidden;
  background: #0a0604;
}

/* ── 第 1 層：MP4 捲動底圖 ── */
.chat-bg-scroll {
  position: fixed;
  inset: 0;
  z-index: 0;
  overflow: auto;
  overflow-x: auto;
  overflow-y: auto;
  background: #0a0604;
  -webkit-overflow-scrolling: touch;
}

/* 至少填滿視窗；視窗細過影片時出現捲軸 */
.chat-bg-inner {
  position: relative;
  width: max(100vw, var(--bg-video-w, 1920px));
  height: max(100vh, var(--bg-video-h, 1080px));
  min-width: var(--bg-video-w, 1920px);
  min-height: var(--bg-video-h, 1080px);
}

.chat-bg-video {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: fill;
  pointer-events: none;
}

/* ── 第 2 層：圖1 + 對話（一組） ── */
.chat-widget {
  --widget-w: min(520px, 90vw);
  position: fixed;
  z-index: 10;
  width: var(--widget-w);
  aspect-ratio: 1 / 1;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  touch-action: none;
}

.chat-widget.is-dragging {
  cursor: grabbing;
}

.chat-widget__frame {
  display: block;
  width: 100%;
  height: 100%;
  pointer-events: none;
  border-radius: 4px;
}

/* 拖動手把 — 頂部惡搞區下方 */
.chat-widget__drag {
  position: absolute;
  top: 22%;
  left: 50%;
  transform: translateX(-50%);
  z-index: 20;
  width: 36px;
  height: 22px;
  border: 1px solid rgba(255, 213, 106, 0.5);
  border-radius: 6px;
  background: rgba(40, 25, 15, 0.75);
  color: #ffd56a;
  font-size: 12px;
  line-height: 1;
  cursor: grab;
  opacity: 0.85;
}

.chat-widget__drag:active {
  cursor: grabbing;
}

.chat-widget.is-dragging .chat-widget__drag {
  opacity: 1;
}

/* 金框內 parchment — % 相對於 chat-widget */
.chat-slot {
  --slot-left: 13%;
  --slot-top: 31.25%;
  --slot-width: 74%;
  --slot-height: 60%;
  --slot-pad-x: 0%;
  --slot-pad-y: 0%;

  position: absolute;
  left: var(--slot-left);
  top: var(--slot-top);
  width: var(--slot-width);
  height: var(--slot-height);
  padding: var(--slot-pad-y) var(--slot-pad-x);
  box-sizing: border-box;
  overflow: hidden;
  z-index: 5;
}

.chat-page.is-debug .chat-slot {
  outline: 2px dashed rgba(255, 60, 60, 0.9);
  background: rgba(255, 60, 60, 0.1);
}

.chat-slot__toggle {
  position: absolute;
  top: 2px;
  right: 2px;
  z-index: 6;
  width: 22px;
  height: 22px;
  margin: 0;
  border: 1px solid rgba(139, 105, 20, 0.45);
  border-radius: 5px;
  background: rgba(61, 40, 23, 0.8);
  color: #ffd56a;
  font-size: 12px;
  cursor: pointer;
}

/* 收起 */
.chat-page.is-collapsed .chat-widget {
  width: min(240px, 70vw);
  aspect-ratio: auto;
  height: 44px;
  cursor: pointer;
}

.chat-page.is-collapsed .chat-widget__frame,
.chat-page.is-collapsed .chat-widget__drag,
.chat-page.is-collapsed .chat-panel {
  display: none;
}

.chat-page.is-collapsed .chat-slot {
  position: static;
  width: 100%;
  height: 100%;
  padding: 0;
}

.chat-page.is-collapsed .chat-slot__toggle {
  position: static;
  width: 100%;
  height: 44px;
  border-radius: 22px;
  font-size: 14px;
}

.chat-page.is-collapsed .chat-slot__toggle::after {
  content: ' AI 設計顧問（按此展開）';
  font-size: 12px;
}

.chat-panel {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-height: 0;
  height: 100%;
  background: transparent;
  overflow: hidden;
}

.chat-panel__body {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-height: 0;
}

.chat-messages {
  flex: 1;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 6px;
  scroll-behavior: smooth;
}

.chat-msg {
  max-width: 96%;
  padding: 7px 9px;
  border-radius: 8px;
  font-size: clamp(10px, 2.8vw, 12px);
  line-height: 1.45;
  word-break: break-word;
}

.chat-msg--bot {
  align-self: flex-start;
  background: rgba(255, 255, 255, 0.9);
  border: 1px solid rgba(180, 140, 60, 0.2);
  color: #2a2018;
}

.chat-msg--user {
  align-self: flex-end;
  background: rgba(61, 40, 23, 0.88);
  color: #fff8e7;
}

.chat-msg--typing {
  opacity: 0.65;
  font-style: italic;
}

.chat-msg__note {
  display: block;
  font-size: 11px;
  opacity: 0.75;
  margin-bottom: 4px;
}

.chat-msg--bot a {
  color: #8b6914;
  font-weight: 600;
}

.chat-quick {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
  margin-top: 4px;
}

.chat-quick button {
  padding: 4px 8px;
  font-size: 10px;
  border: 1px solid rgba(180, 140, 60, 0.45);
  border-radius: 14px;
  background: rgba(255, 255, 255, 0.92);
  color: #3d2817;
  cursor: pointer;
}

.chat-quick button.is-primary {
  background: linear-gradient(135deg, #c9a227, #8b6914);
  color: #fff;
}

.chat-input-row {
  display: flex;
  gap: 4px;
  margin-top: 5px;
  flex-shrink: 0;
}

.chat-input-row input {
  flex: 1;
  min-width: 0;
  padding: 6px 8px;
  border: 1px solid rgba(180, 140, 60, 0.4);
  border-radius: 6px;
  font-size: 11px;
  background: rgba(255, 255, 255, 0.95);
}

.chat-input-row button {
  padding: 6px 9px;
  border: none;
  border-radius: 6px;
  background: linear-gradient(135deg, #c9a227, #8b6914);
  color: #fff;
  font-size: 11px;
  font-weight: 600;
  cursor: pointer;
}

.chat-panel__foot {
  flex-shrink: 0;
  padding-top: 3px;
  margin-top: 2px;
  border-top: 1px dashed rgba(139, 105, 20, 0.2);
}

.chat-apps__label {
  display: none;
}

.chat-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 3px;
}

.chat-actions a,
.chat-actions .link-btn {
  padding: 3px 6px;
  font-size: 9px;
  text-decoration: none;
  border-radius: 4px;
  border: 1px solid rgba(180, 140, 60, 0.35);
  background: rgba(255, 255, 255, 0.88);
  color: #3d2817;
}

.chat-actions a.wts {
  background: #25d366;
  color: #fff;
  border-color: #1da851;
  font-weight: 600;
}

.chat-apps__label {
  font-size: 8px;
  color: #8a7355;
  margin: 3px 0 2px;
}

.chat-apps .chat-actions {
  gap: 2px;
}

@media (max-width: 768px) {
  .chat-widget {
    --widget-w: min(420px, 94vw);
  }
}