/* ===== Reset & Base ===== */
*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

:root {
  --gold: #B8860B;
  --gold-light: #D4A843;
  --gold-bg: #FAF6EE;
  --dark: #2C2C2C;
  --text: #444;
  --text-light: #888;
  --white: #fff;
  --border: #E8E0D0;
  --bg: #FDFBF7;
  --card-shadow: 0 2px 12px rgba(0,0,0,0.05);
  --radius: 12px;
}

body {
  font-family: 'Noto Sans TC', -apple-system, BlinkMacSystemFont, sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.container {
  max-width: 720px;
  margin: 0 auto;
  padding: 0 20px;
  width: 100%;
}

/* ===== Header ===== */
.header {
  text-align: center;
  padding: 36px 20px 20px;
}

.brand-badge {
  display: inline-block;
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 3px;
  color: var(--gold);
  border: 1.5px solid var(--gold);
  padding: 4px 16px;
  border-radius: 16px;
  margin-bottom: 14px;
}

h1 {
  font-size: 26px;
  font-weight: 700;
  color: var(--dark);
  margin-bottom: 6px;
}

.subtitle {
  font-size: 14px;
  color: var(--text-light);
}

/* ===== Main ===== */
main.container {
  flex: 1;
  display: flex;
  flex-direction: column;
  padding-bottom: 24px;
}

/* ===== Chat Window ===== */
.chat-window {
  flex: 1;
  display: flex;
  flex-direction: column;
  gap: 16px;
  padding: 8px 0 16px;
  min-height: 200px;
}

/* ===== Messages ===== */
.msg {
  display: flex;
  gap: 10px;
  align-items: flex-start;
}

.msg.user {
  flex-direction: row-reverse;
}

.msg-avatar {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 15px;
  font-weight: 700;
}

.msg.assistant .msg-avatar {
  background: linear-gradient(135deg, var(--gold), var(--gold-light));
  color: var(--white);
  font-size: 12px;
  letter-spacing: 0.5px;
}

.msg.user .msg-avatar {
  background: var(--border);
  color: var(--text-light);
}

.msg-bubble {
  max-width: 80%;
  padding: 12px 16px;
  border-radius: 16px;
  font-size: 15px;
  line-height: 1.7;
}

.msg.assistant .msg-bubble {
  background: var(--white);
  box-shadow: var(--card-shadow);
  border-bottom-left-radius: 4px;
  color: var(--text);
}

.msg.user .msg-bubble {
  background: linear-gradient(135deg, var(--gold), var(--gold-light));
  color: var(--white);
  border-bottom-right-radius: 4px;
}

/* Markdown-like formatting in assistant bubbles */
.msg.assistant .msg-bubble strong {
  color: var(--dark);
  font-weight: 600;
}

.msg.assistant .msg-bubble br {
  content: '';
  display: block;
  margin-top: 4px;
}

/* Table styling in bubbles */
.msg.assistant .msg-bubble table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13px;
  margin-top: 8px;
}

.msg.assistant .msg-bubble th {
  background: var(--gold-bg);
  color: var(--dark);
  font-weight: 600;
  padding: 6px 10px;
  text-align: left;
  border: 1px solid var(--border);
}

.msg.assistant .msg-bubble td {
  padding: 6px 10px;
  border: 1px solid var(--border);
  vertical-align: top;
}

.msg.assistant .msg-bubble tr:nth-child(even) td {
  background: #FDFBF7;
}

/* ===== Loading dots ===== */
.typing-indicator {
  display: flex;
  gap: 5px;
  align-items: center;
  padding: 14px 16px;
}

.typing-indicator span {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--gold-light);
  animation: bounce 1.2s infinite;
}

.typing-indicator span:nth-child(2) { animation-delay: 0.2s; }
.typing-indicator span:nth-child(3) { animation-delay: 0.4s; }

@keyframes bounce {
  0%, 60%, 100% { transform: translateY(0); opacity: 0.5; }
  30% { transform: translateY(-6px); opacity: 1; }
}

/* ===== Suggestions ===== */
.suggestions {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding: 8px 0 16px;
}

.suggestion-btn {
  background: var(--white);
  border: 1.5px solid var(--border);
  border-radius: 20px;
  padding: 7px 14px;
  font-family: inherit;
  font-size: 13px;
  color: var(--text);
  cursor: pointer;
  transition: all 0.2s;
  line-height: 1.4;
}

.suggestion-btn:hover {
  border-color: var(--gold);
  color: var(--gold);
  background: var(--gold-bg);
}

/* ===== Input Area ===== */
.input-area {
  display: flex;
  align-items: flex-end;
  gap: 10px;
  background: var(--white);
  border: 1.5px solid var(--border);
  border-radius: 16px;
  padding: 10px 10px 10px 16px;
  box-shadow: var(--card-shadow);
  transition: border-color 0.2s;
}

.input-area:focus-within {
  border-color: var(--gold);
}

.input-box {
  flex: 1;
  border: none;
  outline: none;
  font-family: inherit;
  font-size: 15px;
  color: var(--dark);
  background: transparent;
  resize: none;
  line-height: 1.5;
  max-height: 120px;
  overflow-y: auto;
}

.input-box::placeholder {
  color: #bbb;
}

.send-btn {
  width: 38px;
  height: 38px;
  border-radius: 50%;
  border: none;
  background: linear-gradient(135deg, var(--gold), var(--gold-light));
  color: var(--white);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: all 0.2s;
}

.send-btn:hover {
  box-shadow: 0 3px 10px rgba(184, 134, 11, 0.35);
  transform: translateY(-1px);
}

.send-btn:disabled {
  opacity: 0.45;
  cursor: not-allowed;
  transform: none;
  box-shadow: none;
}

/* ===== Responsive ===== */
@media (max-width: 480px) {
  h1 { font-size: 22px; }
  .msg-bubble { max-width: 90%; font-size: 14px; }
  .suggestion-btn { font-size: 12px; }
}

/* ===== Footer ===== */
.footer {
  text-align: center;
  padding: 24px;
  border-top: 1px solid var(--border);
  font-size: 13px;
  color: var(--text-light);
}

.ig-link {
  display: inline-flex;
  align-items: center;
  vertical-align: -3px;
  margin-left: 8px;
  color: var(--text-light);
  transition: color 0.2s;
}

.ig-link:hover {
  color: var(--gold);
}