/* 銀行自己的 CSS。button、input 故意寫成全站規則，用來證明它們進不了聊天視窗。 */
* { box-sizing: border-box; }
body {
  margin: 0;
  background: #f1f5f9;
  color: #0f172a;
  font-family: Georgia, "Noto Serif CJK TC", "Songti TC", serif;
}
button {
  padding: 10px 22px;
  border: 0;
  border-radius: 2px;
  background: #0b3d91;
  color: #fff;
  font: inherit;
  cursor: pointer;
}
input, select {
  width: 100%;
  padding: 9px 10px;
  border: 1px solid #94a3b8;
  border-radius: 2px;
  background: #fff;
  font: inherit;
}

.notice {
  margin: 0;
  padding: 6px 24px;
  background: #fef3c7;
  color: #78350f;
  font-family: -apple-system, "PingFang TC", "Noto Sans CJK TC", sans-serif;
  font-size: 12.5px;
}
.bank-header {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 14px 24px;
  background: #0b3d91;
  color: #fff;
}
.bank-header strong { font-size: 18px; }
.bank-header .who { margin-left: auto; font-size: 13px; }

.modes {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
  max-width: 640px;
  padding: 12px 24px 0;
  font-family: -apple-system, "PingFang TC", "Noto Sans CJK TC", sans-serif;
  font-size: 13px;
}
.modes a {
  padding: 6px 12px;
  border: 1px solid #94a3b8;
  border-radius: 999px;
  color: #334155;
  text-decoration: none;
}
.modes a.current { border-color: #b45309; background: #b45309; color: #fff; }

.page { max-width: 640px; padding: 16px 24px 96px; }

.steps {
  display: flex;
  gap: 6px;
  margin: 0 0 20px;
  padding: 0;
  list-style: none;
  font-size: 13px;
}
.steps li {
  flex: 1;
  padding: 7px 6px;
  border-bottom: 3px solid #cbd5e1;
  color: #64748b;
  text-align: center;
}
.steps li.done { border-color: #64748b; }
.steps li.current { border-color: #0b3d91; color: #0b3d91; font-weight: 700; }

main { padding: 20px 22px; background: #fff; border: 1px solid #e2e8f0; }
main section[hidden] { display: none; }
h1 { margin: 0 0 16px; font-size: 20px; }
#application { display: grid; grid-template-columns: 1fr 1fr; gap: 14px 16px; }
.field label { display: block; margin-bottom: 4px; font-size: 13.5px; }
.field.invalid input, .field.invalid select { border-color: #b91c1c; }
.error { display: block; margin-top: 3px; color: #b91c1c; font-size: 12px; }
.ai-tag {
  margin-left: 6px;
  padding: 0 6px;
  border-radius: 3px;
  background: #fef3c7;
  color: #92400e;
  font-size: 11.5px;
}
.actions { grid-column: 1 / -1; margin-top: 4px; }

.demo {
  margin-top: 20px;
  padding: 14px 16px;
  border: 1px dashed #94a3b8;
  font-family: -apple-system, "PingFang TC", "Noto Sans CJK TC", sans-serif;
  font-size: 13px;
  line-height: 1.6;
}
.demo h2 { margin: 0 0 6px; font-size: 14px; }
.demo h3 { margin: 14px 0 6px; font-size: 13px; }
.demo p { margin: 6px 0; }
.demo pre {
  margin: 6px 0;
  padding: 10px;
  overflow-x: auto;
  background: #0f172a;
  color: #e2e8f0;
  font-family: ui-monospace, Menlo, monospace;
  font-size: 12px;
}
.demo-actions { display: flex; flex-wrap: wrap; gap: 8px; }
.demo-actions button { padding: 7px 12px; background: #475569; font-size: 12.5px; }
.event-log { max-height: 220px; margin: 0; padding: 0; overflow-y: auto; list-style: none; }
.event-log li { padding: 3px 0; border-bottom: 1px solid #e2e8f0; }
.event-log b { color: #b45309; font-weight: 600; }

/* iframe 模式：開關按鈕和外框都是銀行自己的 */
#chat-open {
  position: fixed;
  right: 24px;
  bottom: 24px;
  z-index: 1000;
  padding: 12px 18px;
  border-radius: 999px;
  background: #b45309;
  font-family: -apple-system, "PingFang TC", "Noto Sans CJK TC", sans-serif;
  font-size: 15px;
  font-weight: 600;
  box-shadow: 0 6px 18px rgba(0, 0, 0, .25);
}
#chat-open[hidden] { display: none; }
#ai-chat-frame {
  position: fixed;
  top: 0;
  right: 0;
  bottom: 0;
  z-index: 1000;
  width: min(44vw, 520px);
  height: 100%;
  border: 0;
  border-left: 3px solid #b45309;
  box-shadow: -8px 0 24px rgba(0, 0, 0, .18);
}
#ai-chat-frame[hidden] { display: none; }

@media (max-width: 760px) {
  #ai-chat-frame {
    top: auto;
    left: 0;
    width: 100%;
    height: 62vh;
    border-left: 0;
    border-top: 3px solid #b45309;
  }
}
@media (max-width: 560px) {
  #application { grid-template-columns: 1fr; }
}