:root {
  --brand: #2f7bf6;         /* 主色：藍 */
  --brand-dark: #1d5fd6;
  --brand-light: #7fb1ff;
  --accent: #22c1dc;        /* 輔色：青綠，讓整體更彩色一點 */
  --accent-2: #7c6bf2;      /* 輔色：紫，用在少數強調點綴 */
  --bg-page: #eaf3ff;       /* 頁面底色：淡藍 */
  --bg-card: #ffffff;
  --bubble-bot: #ffffff;
  --bubble-user-from: #2f7bf6;
  --bubble-user-to: #22c1dc;
  --text: #1f2937;
  --muted: #8291a8;
  --border: #dbe9ff;
  --radius: 16px;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  min-height: 100vh;
  font-family: -apple-system, "PingFang TC", "Microsoft JhengHei", sans-serif;
  background:
    radial-gradient(circle at 15% 0%, #dff0ff 0%, transparent 45%),
    radial-gradient(circle at 100% 20%, #e6e0ff 0%, transparent 40%),
    var(--bg-page);
  color: var(--text);
  padding: 24px 16px;
}

.chat-wrap {
  max-width: 760px;
  min-height: calc(100vh - 48px);
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 24px;
  box-shadow: 0 12px 32px rgba(47, 123, 246, 0.14), 0 2px 8px rgba(31, 41, 55, 0.06);
  overflow: hidden;
}

.chat-header {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 20px 22px;
  background: linear-gradient(120deg, var(--brand) 0%, var(--accent) 100%);
  color: #fff;
}

.avatar {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: rgba(255, 255, 255, 0.22);
  border: 2px solid rgba(255, 255, 255, 0.6);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 22px;
  flex-shrink: 0;
}

.title { font-weight: 700; font-size: 15px; }
.subtitle { font-size: 12px; opacity: 0.9; }

.chat-log {
  flex: 1;
  padding: 22px;
  display: flex;
  flex-direction: column;
  gap: 12px;
  overflow-y: auto;
  background: linear-gradient(180deg, #f5f9ff 0%, #ffffff 60%);
}

.bubble {
  max-width: 80%;
  padding: 11px 15px;
  border-radius: var(--radius);
  line-height: 1.55;
  font-size: 14px;
  white-space: pre-wrap;
  box-shadow: 0 1px 2px rgba(31, 41, 55, 0.05);
}

.bubble.bot {
  background: var(--bubble-bot);
  border: 1px solid var(--border);
  align-self: flex-start;
  border-bottom-left-radius: 4px;
}

.bubble.user {
  background: linear-gradient(120deg, var(--bubble-user-from), var(--bubble-user-to));
  color: #fff;
  align-self: flex-end;
  border-bottom-right-radius: 4px;
}

.bubble.error {
  background: #fff1f0;
  color: #d1453b;
  border: 1px solid #ffd2ce;
  align-self: flex-start;
  font-size: 13px;
}

.chat-input-area {
  padding: 16px 22px 24px;
  background: #fbfdff;
  border-top: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.chat-input-area input[type="text"],
.chat-input-area input[type="date"],
.chat-input-area textarea,
.chat-input-area select {
  width: 100%;
  padding: 11px 13px;
  border: 1.5px solid var(--border);
  border-radius: 12px;
  font-size: 14px;
  font-family: inherit;
  background: #fff;
  transition: border-color 0.15s ease;
}

.chat-input-area input[type="text"]:focus,
.chat-input-area input[type="date"]:focus,
.chat-input-area textarea:focus,
.chat-input-area select:focus {
  outline: none;
  border-color: var(--brand);
}

.chat-input-area textarea {
  min-height: 90px;
  resize: vertical;
}

.option-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.option-btn {
  padding: 9px 16px;
  border-radius: 999px;
  border: 1.5px solid var(--brand-light);
  background: #fff;
  color: var(--brand-dark);
  cursor: pointer;
  font-size: 13px;
  transition: all 0.15s ease;
}

.option-btn:hover {
  border-color: var(--brand);
  background: #f0f7ff;
}

.option-btn.selected {
  background: linear-gradient(120deg, var(--brand), var(--accent));
  border-color: transparent;
  color: #fff;
}

.input-row {
  display: flex;
  gap: 8px;
}

/* ---------- 日期選擇（內嵌月曆格子，取代原生日曆彈窗，避免在畫面下方被裁切點不到） ---------- */

.cal-picker {
  width: 100%;
  max-width: 300px;
  margin: 0 auto;
  border: 1.5px solid var(--border);
  border-radius: 14px;
  padding: 10px;
  background: #fff;
}

.cal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 8px;
}

.cal-nav-group {
  display: flex;
  gap: 4px;
}

.cal-nav {
  width: 26px;
  height: 26px;
  flex-shrink: 0;
  border-radius: 8px;
  border: 1.5px solid var(--border);
  background: #fff;
  color: var(--brand-dark);
  font-size: 14px;
  line-height: 1;
  cursor: pointer;
}

.cal-nav:hover {
  border-color: var(--brand-light);
  background: #f0f7ff;
}

.cal-label {
  font-weight: 700;
  font-size: 13px;
  color: var(--text);
  white-space: nowrap;
}

.cal-hint {
  font-size: 12px;
  font-weight: 700;
  color: var(--brand-dark);
  margin-bottom: 8px;
}

.cal-grid {
  display: grid;
  grid-template-columns: repeat(7, 1fr);
  gap: 4px;
}

.cal-weekday {
  text-align: center;
  font-size: 11px;
  color: var(--muted);
  padding: 4px 0;
}

.cal-day {
  aspect-ratio: 1 / 1;
  border: none;
  background: transparent;
  border-radius: 8px;
  font-size: 12px;
  font-family: inherit;
  color: var(--text);
  cursor: pointer;
}

.cal-day:not(.cal-day-empty):hover {
  background: #f0f7ff;
}

.cal-day-empty {
  cursor: default;
}

.cal-selected,
.cal-range-start,
.cal-range-end {
  background: linear-gradient(120deg, var(--brand), var(--accent));
  color: #fff;
  font-weight: 700;
  border-radius: 8px;
}

.cal-range-mid {
  background: #dcebff;
  border-radius: 0;
}

button.primary {
  padding: 11px 20px;
  border: none;
  border-radius: 12px;
  background: linear-gradient(120deg, var(--brand), var(--accent));
  color: #fff;
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  white-space: nowrap;
  box-shadow: 0 4px 12px rgba(47, 123, 246, 0.28);
}

button.primary:hover { filter: brightness(1.05); }

button.secondary {
  padding: 11px 16px;
  border: 1.5px solid var(--border);
  border-radius: 12px;
  background: #fff;
  color: var(--text);
  cursor: pointer;
  font-size: 13px;
}

button.secondary:hover { border-color: var(--brand-light); }

button:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.hint { font-size: 12px; color: var(--muted); }

/* ---------- 助理選單首頁 ---------- */

.picker-wrap {
  max-width: 760px;
  margin: 0 auto;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 24px;
  box-shadow: 0 12px 32px rgba(47, 123, 246, 0.14), 0 2px 8px rgba(31, 41, 55, 0.06);
  overflow: hidden;
}

.picker-header {
  padding: 26px 24px;
  background: linear-gradient(120deg, var(--brand) 0%, var(--accent-2) 100%);
  color: #fff;
}

.picker-title { font-size: 18px; font-weight: 700; }
.picker-subtitle { font-size: 13px; opacity: 0.9; margin-top: 4px; }

.assistant-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: 20px;
}

.assistant-card {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 16px;
  border: 1.5px solid var(--border);
  border-radius: 16px;
  background: #fbfdff;
  text-decoration: none;
  color: var(--text);
  transition: all 0.15s ease;
}

.assistant-card:hover {
  border-color: var(--brand-light);
  box-shadow: 0 6px 16px rgba(47, 123, 246, 0.14);
  transform: translateY(-1px);
}

.assistant-card-icon {
  width: 46px;
  height: 46px;
  border-radius: 50%;
  background: linear-gradient(120deg, var(--brand), var(--accent));
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 22px;
  flex-shrink: 0;
}

.assistant-card-body { flex: 1; }
.assistant-card-name { font-weight: 700; font-size: 15px; }
.assistant-card-desc { font-size: 12px; color: var(--muted); margin-top: 2px; }
.assistant-card-arrow { font-size: 22px; color: var(--brand-light); }