/* ══════════════════════════════════════════
   家具展示間預約系統 — 前台樣式
   設計風格：簡約有質感 / 淺色米白 / 明黑混搭
══════════════════════════════════════════ */

:root {
  --ivory:     #faf8f5;
  --ivory-2:   #f2ede6;
  --ivory-3:   #e8e0d5;
  --charcoal:  #1a1a1a;
  --charcoal-2:#2e2e2e;
  --warm-gray: #8a8078;
  --accent:    #b8965a;
  --accent-l:  #f5ede0;
  --danger:    #b84242;
  --success:   #2a7a5a;
  --border:    #ddd8d0;
  --radius:    4px;
  --radius-lg: 8px;
  --shadow:    0 2px 20px rgba(26,20,10,.08);
  --transition: all .22s ease;
}

.fb-wrap {
  font-family: 'Noto Sans TC', 'Noto Serif TC', sans-serif;
  max-width: 640px;
  margin: 48px auto;
  padding: 0 20px 80px;
  color: var(--charcoal);
  position: relative;
}

/* ── 步驟指示 ── */
.fb-stepper {
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 48px;
  gap: 0;
}
.fb-step {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
}
.fb-step-num {
  width: 32px; height: 32px;
  border-radius: 50%;
  border: 1.5px solid var(--border);
  display: flex; align-items: center; justify-content: center;
  font-size: 13px; font-weight: 500; color: var(--warm-gray);
  background: var(--ivory);
  transition: var(--transition);
  font-family: 'Noto Serif TC', serif;
}
.fb-step-lbl {
  font-size: 11px;
  color: var(--warm-gray);
  letter-spacing: .06em;
  white-space: nowrap;
  transition: var(--transition);
}
.fb-step.active .fb-step-num  { background: var(--charcoal); border-color: var(--charcoal); color: #fff; }
.fb-step.active .fb-step-lbl  { color: var(--charcoal); font-weight: 600; }
.fb-step.done   .fb-step-num  { background: var(--accent); border-color: var(--accent); color: #fff; }
.fb-step-line {
  flex: 1;
  height: 1px;
  background: var(--border);
  margin: 0 12px 20px;
  min-width: 40px;
}

/* ── Panel ── */
.fb-panel { display: none; animation: fbFade .35s ease; }
.fb-panel.active { display: block; }
@keyframes fbFade {
  from { opacity: 0; transform: translateY(12px); }
  to   { opacity: 1; transform: none; }
}
.fb-panel-title {
  font-family: 'Noto Serif TC', serif;
  font-size: 22px;
  font-weight: 400;
  letter-spacing: .04em;
  margin: 0 0 8px;
  color: var(--charcoal);
  line-height: 1.4;
}
.fb-panel-sub {
  font-size: 13px;
  color: var(--warm-gray);
  margin: 0 0 28px;
  letter-spacing: .02em;
}

/* ── 商品類別按鈕 ── */
.fb-cat-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 32px;
}
.fb-cat-btn {
  padding: 9px 20px;
  border: 1.5px solid var(--border);
  border-radius: 2px;
  background: var(--ivory);
  color: var(--charcoal-2);
  font-family: 'Noto Sans TC', sans-serif;
  font-size: 14px;
  font-weight: 400;
  cursor: pointer;
  transition: var(--transition);
  letter-spacing: .03em;
}
.fb-cat-btn:hover {
  border-color: var(--charcoal);
  background: #fff;
}
.fb-cat-btn.selected {
  background: var(--charcoal);
  border-color: var(--charcoal);
  color: #fff;
}

/* ── 規格選擇 ── */
.fb-specs-wrap {
  margin-bottom: 28px;
}
.fb-spec-block {
  padding: 20px 0;
  border-top: 1px solid var(--border);
  animation: fbFade .25s ease;
}
.fb-spec-block:last-child { border-bottom: 1px solid var(--border); }
.fb-spec-cat-name {
  font-size: 11px;
  letter-spacing: .1em;
  text-transform: uppercase;
  color: var(--accent);
  font-weight: 600;
  margin-bottom: 14px;
}
.fb-spec-group { margin-bottom: 14px; }
.fb-spec-label {
  font-size: 12px;
  color: var(--warm-gray);
  margin-bottom: 8px;
  letter-spacing: .04em;
}
.fb-spec-options {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}
.fb-spec-opt {
  padding: 6px 14px;
  border: 1px solid var(--border);
  border-radius: 2px;
  background: #fff;
  color: var(--charcoal);
  font-size: 13px;
  cursor: pointer;
  transition: var(--transition);
  font-family: 'Noto Sans TC', sans-serif;
}
.fb-spec-opt:hover    { border-color: var(--charcoal); }
.fb-spec-opt.selected { background: var(--charcoal); color: #fff; border-color: var(--charcoal); }

/* ── 額外欄位 ── */
.fb-extra-fields {
  padding: 24px 0;
  border-top: 1px solid var(--border);
}

/* ── 日期時間 ── */
.fb-datetime-grid {
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: 32px;
  margin-bottom: 32px;
  align-items: start;
}

/* ── 表單欄位 ── */
.fb-field { display: flex; flex-direction: column; gap: 8px; margin-bottom: 20px; }
.fb-field-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.fb-label {
  font-size: 12px;
  font-weight: 600;
  letter-spacing: .06em;
  text-transform: uppercase;
  color: var(--charcoal-2);
}
.fb-opt { font-weight: 400; color: var(--warm-gray); text-transform: none; letter-spacing: 0; }
.fb-req { color: var(--danger); }
.fb-hint { font-size: 12px; color: var(--warm-gray); margin: 2px 0 0; }
.fb-hint-center { color: var(--warm-gray); font-size: 13px; text-align: center; padding: 16px 0; }

.fb-input {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 11px 14px;
  font-family: 'Noto Sans TC', sans-serif;
  font-size: 14px;
  color: var(--charcoal);
  background: #fff;
  width: 100%;
  box-sizing: border-box;
  transition: var(--transition);
  -webkit-appearance: none;
}
.fb-input:focus {
  outline: none;
  border-color: var(--charcoal);
  box-shadow: 0 0 0 2px rgba(26,26,26,.06);
}
textarea.fb-input { resize: vertical; min-height: 72px; }

.fb-input-prefix {
  display: flex;
  align-items: center;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  background: #fff;
  transition: var(--transition);
}
.fb-input-prefix:focus-within { border-color: var(--charcoal); }
.fb-input-prefix > span {
  padding: 0 12px;
  font-size: 13px;
  color: var(--warm-gray);
  background: var(--ivory-2);
  border-right: 1px solid var(--border);
  white-space: nowrap;
  align-self: stretch;
  display: flex; align-items: center;
}
.fb-input-prefix .fb-input {
  border: none; box-shadow: none;
  border-radius: 0;
}
.fb-input-prefix .fb-input:focus { box-shadow: none; }

/* ── 時段按鈕 ── */
.fb-slot-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}
.fb-slot-btn {
  padding: 8px 14px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: #fff;
  font-size: 13px;
  font-family: 'Noto Sans TC', sans-serif;
  cursor: pointer;
  transition: var(--transition);
  color: var(--charcoal-2);
}
.fb-slot-btn:hover:not(:disabled)  { border-color: var(--charcoal); color: var(--charcoal); }
.fb-slot-btn.selected               { background: var(--charcoal); color: #fff; border-color: var(--charcoal); }
.fb-slot-btn.full                   {
  background: var(--ivory-2);
  color: var(--warm-gray);
  cursor: not-allowed;
  text-decoration: line-through;
  font-size: 12px;
}
.fb-slot-capacity {
  font-size: 10px;
  color: var(--warm-gray);
  margin-left: 3px;
}

/* ── 表單格線 ── */
.fb-form-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0 20px;
}
.fb-field-full { grid-column: 1/-1; }

/* ── 預約摘要 ── */
.fb-summary {
  background: var(--ivory-2);
  border: 1px solid var(--ivory-3);
  border-radius: var(--radius-lg);
  padding: 20px 22px;
  margin-bottom: 20px;
}
.fb-summary-title {
  font-size: 11px;
  font-weight: 700;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--warm-gray);
  margin-bottom: 14px;
}
.fb-summary-row {
  display: flex;
  justify-content: space-between;
  font-size: 13px;
  padding: 6px 0;
  border-bottom: 1px solid var(--ivory-3);
}
.fb-summary-row:last-child { border-bottom: none; }
.fb-summary-key { color: var(--warm-gray); }
.fb-summary-val { color: var(--charcoal); font-weight: 500; }

/* ── Privacy note ── */
.fb-privacy {
  font-size: 12px;
  color: var(--warm-gray);
  margin-bottom: 24px;
  line-height: 1.6;
  padding: 12px 14px;
  background: var(--ivory-2);
  border-left: 3px solid var(--accent);
  border-radius: 2px;
}

/* ── 按鈕 ── */
.fb-btn-row { display: flex; gap: 12px; align-items: center; }
.fb-btn {
  padding: 13px 30px;
  border: none;
  border-radius: var(--radius);
  font-family: 'Noto Sans TC', sans-serif;
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  letter-spacing: .04em;
  transition: var(--transition);
  white-space: nowrap;
}
.fb-btn-primary {
  background: var(--charcoal);
  color: #fff;
}
.fb-btn-primary:hover:not(:disabled) {
  background: #000;
  transform: translateY(-1px);
  box-shadow: 0 4px 16px rgba(26,26,26,.2);
}
.fb-btn-primary:disabled {
  background: #ccc;
  cursor: not-allowed;
  transform: none;
  box-shadow: none;
}
.fb-btn-ghost {
  background: transparent;
  color: var(--warm-gray);
  border: 1px solid var(--border);
}
.fb-btn-ghost:hover { color: var(--charcoal); border-color: var(--charcoal); }

/* ── 成功畫面 ── */
.fb-success {
  text-align: center;
  padding: 48px 24px;
}
.fb-check {
  width: 64px; height: 64px;
  border-radius: 50%;
  background: var(--charcoal);
  color: #fff;
  font-size: 28px;
  display: flex; align-items: center; justify-content: center;
  margin: 0 auto 24px;
  animation: fbPop .4s cubic-bezier(.18,.89,.32,1.28);
}
@keyframes fbPop {
  from { transform: scale(.3); opacity: 0; }
  to   { transform: scale(1);  opacity: 1; }
}
.fb-success h3 {
  font-family: 'Noto Serif TC', serif;
  font-size: 24px;
  font-weight: 400;
  margin-bottom: 12px;
  color: var(--charcoal);
}
.fb-success p {
  color: var(--warm-gray);
  font-size: 14px;
  line-height: 1.7;
  margin-bottom: 32px;
}

/* ── Loading ── */
.fb-loading {
  position: absolute; inset: 0;
  background: rgba(250,248,245,.85);
  display: none; /* 預設隱藏，JS 呼叫 showLoading(true) 才顯示 */
  align-items: center; justify-content: center;
  border-radius: var(--radius-lg);
  z-index: 99;
  backdrop-filter: blur(2px);
}
.fb-spinner {
  width: 32px; height: 32px;
  border: 2px solid var(--border);
  border-top-color: var(--charcoal);
  border-radius: 50%;
  animation: fbSpin .7s linear infinite;
}
@keyframes fbSpin { to { transform: rotate(360deg); } }

/* ── 響應式 ── */
@media (max-width: 560px) {
  .fb-wrap { padding: 0 16px 60px; margin: 24px auto; }
  .fb-panel-title { font-size: 18px; }
  .fb-datetime-grid { grid-template-columns: 1fr; gap: 20px; }
  .fb-form-grid { grid-template-columns: 1fr; }
  .fb-field-row { grid-template-columns: 1fr; }
  .fb-stepper { gap: 4px; }
  .fb-step-line { min-width: 20px; }
}