/* ============ 基礎樣式 ============ */
*, *::before, *::after { box-sizing: border-box; }

:root {
  --bg: #0e0f12;
  --bg-soft: #15171c;
  --bg-card: #1b1e25;
  --bg-card-hover: #222631;
  --border: #2a2f3a;
  --text: #f2f4f7;
  --text-soft: #c3c9d3;
  --text-mute: #96a0ad;
  --accent: #f5c518;      /* 電影燈具金黃 */
  --accent-dim: #c9a014;
  --danger: #e24141;
  --radius: 10px;
  --radius-sm: 6px;
  --shadow: 0 2px 8px rgba(0,0,0,.4);
  --max-width: 1280px;
}

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "PingFang TC", "Noto Sans TC",
               "Helvetica Neue", Arial, sans-serif;
  font-size: 20pt;
  line-height: 1.75;
  -webkit-font-smoothing: antialiased;
  font-variant-numeric: tabular-nums;
}

a { color: inherit; text-decoration: none; }
button { font-family: inherit; cursor: pointer; }
input, select, textarea { font-family: inherit; font-size: inherit; }

/* ============ 全站英文字體：思源宋體 Heavy (Noto Serif TC 900) ============ */
.home-hero-tagline-en,
.home-services-title .en,
.service-tag,
.studio-hero .en,
.port-hero .en,
.sub-hero .en,
.sub-hero .breadcrumb,
.port-tag,
.section-title,
.layout-block .dims,
.price-value,
.mv-card-num,
.page-card-num,
.en-heavy {
  font-family: 'Noto Serif TC', 'Source Han Serif TC', 'Noto Serif JP', serif !important;
  font-weight: 900 !important;
  text-transform: uppercase;
  font-variant-numeric: tabular-nums;
}

/* ============ 手機版：英文標題一律不換行、縮字級 ============ */
@media (max-width: 520px) {
  .home-hero-tagline-en,
  .service-tag,
  .sub-hero .breadcrumb,
  .sub-hero .en,
  .home-services-title .en,
  .port-hero .en,
  .studio-hero .en,
  .port-tag,
  .section-title {
    font-size: clamp(11px, 3.2vw, 16px) !important;
    letter-spacing: .05em !important;
    white-space: nowrap !important;
  }
  .layout-block .dims {
    font-size: clamp(11px, 3vw, 15px) !important;
    letter-spacing: .02em !important;
  }
  .price-value {
    font-size: 16px !important;
  }
}

/* ============ 頁首 ============ */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(14,15,18,.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}
.header-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 14px 22px;
  display: flex;
  align-items: center;
  gap: 24px;
}
.brand {
  display: flex;
  align-items: center;
  gap: 14px;
  line-height: 1.2;
}
/* 原 logo 向量化版（保持原設計，任何尺寸都清晰）*/
.brand-logo {
  height: 34px;
  width: auto;
  display: block;
  color: var(--text);  /* SVG 用 currentColor，所以筆畫色 = 白色 */
}
.brand-sub {
  font-size: 18px;
  color: var(--text-mute);
  letter-spacing: .12em;
  padding-left: 14px;
  border-left: 1px solid var(--border);
  align-self: center;
}
@media (max-width: 640px) {
  .brand-logo { height: 30px; }
  .brand-sub { display: none; }
}
.header-nav {
  margin-left: auto;
  display: flex;
  gap: 18px;
  align-items: center;
}
.header-nav a {
  color: var(--text-soft);
  font-size: 19px;
  padding: 8px 12px;
  border-radius: var(--radius-sm);
  transition: .15s;
}
.header-nav a:hover { color: var(--text); background: var(--bg-soft); }
.header-nav a.active { color: var(--accent); font-weight: 600; }

.cart-btn {
  position: relative;
  background: var(--accent);
  color: #111 !important;
  padding: 9px 18px !important;
  font-weight: 600;
  border-radius: 999px;
}
.cart-btn:hover { background: var(--accent-dim) !important; }

/* 漢堡選單按鈕（手機版才顯示） */
.nav-toggle {
  display: none;
  margin-left: auto;
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text);
  width: 36px;
  height: 36px;
  padding: 0;
  border-radius: var(--radius-sm);
  font-size: 20px;
  line-height: 1;
  cursor: pointer;
  align-items: center;
  justify-content: center;
}
.nav-toggle:hover { border-color: var(--accent); color: var(--accent); }

/* 手機版：導覽列收進漢堡下拉 */
@media (max-width: 780px) {
  .nav-toggle { display: inline-flex; }
  .site-header { position: sticky; }
  .header-inner { position: relative; padding: 12px 18px; gap: 12px; }
  .header-nav {
    display: none;
    position: absolute;
    top: 100%; left: 0; right: 0;
    flex-direction: column;
    background: rgba(14,15,18,.98);
    backdrop-filter: blur(12px);
    border-bottom: 1px solid var(--border);
    padding: 10px 18px 14px;
    gap: 2px;
    align-items: stretch;
    margin-left: 0;
  }
  .header-nav.open { display: flex; }
  .header-nav a {
    font-size: 19px;
    padding: 14px 14px;
    letter-spacing: .12em;
    border-bottom: 1px solid rgba(255,255,255,.04);
  }
  .header-nav a:last-child { border-bottom: none; }
  .cart-btn {
    text-align: center;
    margin-top: 8px;
    padding: 12px 18px !important;
  }
}
.cart-count {
  position: absolute;
  top: -7px; right: -7px;
  background: var(--danger);
  color: #fff;
  font-size: 18px;
  font-weight: 700;
  min-width: 24px;
  height: 24px;
  border-radius: 12px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0 7px;
}
.cart-count:empty { display: none; }

/* ============ Hero ============ */
.hero {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 32px 22px 20px;
  text-align: center;
}
.hero h1 {
  font-family: 'Noto Serif TC', serif;
  font-size: clamp(26px, 2.99vw, 32px);
  letter-spacing: .25em;
  color: var(--text);
  margin: 0 0 8px;
  font-weight: 600;
}
.hero .en {
  font-family: 'Noto Serif TC', serif;
  font-weight: 900;
  letter-spacing: .18em;
  font-size: 18px;
  color: var(--accent);
  text-transform: uppercase;
  font-variant-numeric: tabular-nums;
}
.hero p {
  color: var(--text-soft);
  max-width: 620px;
  margin: 14px auto 0;
  font-size: 15px;
  letter-spacing: .05em;
  line-height: 1.7;
}
@media (max-width: 640px) {
  .hero { padding: 22px 14px 16px; }
  .hero .en { font-size: 15px; }
  .hero p { font-size: 14px; }
}
.hero-note {
  margin-top: 18px;
  padding: 14px 16px;
  background: var(--bg-soft);
  border-left: 3px solid var(--accent);
  border-radius: var(--radius-sm);
  color: var(--text-soft);
  font-size: 18px;
}

/* ============ Layout ============ */
.layout {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 24px 22px 80px;
  display: grid;
  grid-template-columns: 240px 1fr;
  gap: 32px;
}
/* ============ 手機版橫向分類條（僅 ≤880px 顯示） ============ */
.cat-chips {
  display: none;
}
@media (max-width: 880px) {
  /* 手機版：器材列表優先顯示，分類選單變橫向 chips */
  .layout {
    display: flex;
    flex-direction: column;
    gap: 14px;
    padding: 12px 14px 80px;
  }
  .sidebar {
    display: contents;
  }
  .sidebar-search {
    order: 1;
    margin: 0;
  }
  #cat-chips {
    display: flex;
    order: 2;
    gap: 8px;
    overflow-x: auto;
    overflow-y: hidden;
    scrollbar-width: none;
    -webkit-overflow-scrolling: touch;
    padding: 4px 0 10px;
    margin: 0 -14px 0;
    padding-left: 14px;
    padding-right: 14px;
    position: sticky;
    top: 64px;
    background: rgba(14,15,18,.96);
    backdrop-filter: blur(10px);
    z-index: 45;
    border-bottom: 1px solid var(--border);
  }
  #cat-chips::-webkit-scrollbar { display: none; }
  .cat-chip {
    flex: 0 0 auto;
    background: transparent;
    color: var(--text-soft);
    border: 1.5px solid var(--border);
    border-radius: 999px;
    padding: 8px 16px;
    font-size: 16px;
    letter-spacing: .05em;
    cursor: pointer;
    white-space: nowrap;
    transition: .15s;
  }
  .cat-chip.active {
    background: var(--accent);
    color: #111;
    border-color: var(--accent);
    font-weight: 700;
  }
  .cat-chip-count {
    font-size: 13px;
    opacity: .75;
    margin-left: 4px;
  }
  .cat-chip.active .cat-chip-count { opacity: 1; }
  #main { order: 3; }
  /* 手機版隱藏原本垂直分類（已由橫向 chips 取代） */
  #cat-list { display: none; }

  /* 手機版 2 欄器材格（用 #main 提升特異性覆蓋預設 auto-fill） */
  #main .grid {
    grid-template-columns: 1fr 1fr;
    gap: 10px;
  }
  .item-card {
    padding: 10px;
    border-radius: 10px;
  }
  .item-image {
    width: calc(100% + 20px);
    margin: -10px -10px 10px;
    aspect-ratio: 1 / 1;
  }
  .item-code { font-size: 13px; margin-bottom: 3px; letter-spacing: .05em; }
  .item-name {
    font-size: 15px;
    line-height: 1.3;
    min-height: 0;
    margin-bottom: 4px;
    /* 最多兩行，超過省略 */
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
    overflow: hidden;
  }
  .item-cat { font-size: 13px; margin-bottom: 6px; }
  .item-note {
    font-size: 13px;
    margin: -2px 0 6px;
    display: -webkit-box;
    -webkit-line-clamp: 1;
    -webkit-box-orient: vertical;
    overflow: hidden;
  }
  .item-stock { font-size: 13px; margin-bottom: 6px; padding: 1px 6px; }
  .item-price { font-size: 17px; white-space: nowrap; }
  .item-price-unit { font-size: 13px; white-space: nowrap; }
  .item-bottom {
    flex-direction: column;
    align-items: stretch;
    gap: 8px;
  }
  .item-bottom > div:first-child { white-space: nowrap; }
  .add-btn {
    width: 100%;
    padding: 9px 0;
    font-size: 14px;
    text-align: center;
  }
  .qty-control {
    width: 100%;
    justify-content: space-between;
  }
  /* 群組標題縮排 */
  .group-title {
    font-size: 14px;
    letter-spacing: .1em;
  }
  /* 群組標題下方少一點空間 */
  #main .grid { margin-bottom: 20px; }
}

/* ============ 側邊選單 ============ */
.sidebar {
  position: sticky;
  top: 80px;
  align-self: start;
  max-height: calc(100vh - 100px);
  overflow-y: auto;
  padding-right: 6px;
}
.sidebar-search {
  width: 100%;
  background: var(--bg-soft);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 10px 12px;
  border-radius: var(--radius-sm);
  margin-bottom: 16px;
}
.sidebar-search:focus {
  outline: none;
  border-color: var(--accent);
}
.cat-group { margin-bottom: 18px; }
.cat-group-title {
  font-size: 18px;
  color: var(--text-mute);
  letter-spacing: .15em;
  text-transform: uppercase;
  margin: 0 0 8px 4px;
}
.cat-btn {
  display: block;
  width: 100%;
  text-align: left;
  padding: 7px 12px;
  margin-bottom: 2px;
  background: transparent;
  color: var(--text-soft);
  border: none;
  border-radius: var(--radius-sm);
  font-size: 18px;
}
.cat-btn:hover { background: var(--bg-soft); color: var(--text); }
.cat-btn.active {
  background: var(--bg-card);
  color: var(--accent);
  font-weight: 600;
}
.cat-count {
  float: right;
  font-size: 18px;
  color: var(--text-mute);
  background: var(--bg-soft);
  padding: 2px 10px;
  border-radius: 999px;
  line-height: 1.4;
}

/* ============ 器材列表 ============ */
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 16px;
}
.item-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px;
  display: flex;
  flex-direction: column;
  transition: .15s;
  overflow: hidden;
}
.item-card:hover {
  background: var(--bg-card-hover);
  border-color: #3a414f;
  transform: translateY(-1px);
  box-shadow: var(--shadow);
}
/* 器材圖片區（佔位為主，實際圖之後補） */
.item-image {
  position: relative;
  width: calc(100% + 32px);
  margin: -16px -16px 12px;
  aspect-ratio: 4 / 3;
  background: linear-gradient(135deg, #1a1d24 0%, #14161c 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}
.item-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}
.item-image-fallback {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  color: rgba(245,197,24,.55);
  font-size: 14px;
  letter-spacing: .25em;
  pointer-events: none;
  font-weight: 600;
}
.item-image:not(.no-image) .item-image-fallback { display: none; }
.item-image img[style*="display: none"] + .item-image-fallback,
.item-image.no-image .item-image-fallback { display: flex; }
.item-badge {
  position: absolute;
  top: 10px;
  left: 10px;
  font-size: 13px;
  font-weight: 700;
  padding: 4px 10px;
  border-radius: 4px;
  letter-spacing: .05em;
  z-index: 2;
}
.item-badge.badge-low {
  background: var(--danger);
  color: #fff;
}
.item-info {
  display: flex;
  flex-direction: column;
  flex: 1;
}
.item-code {
  font-size: 18px;
  font-weight: 700;
  color: var(--accent);
  letter-spacing: .1em;
  margin-bottom: 6px;
}
.item-name {
  font-size: 18px;
  font-weight: 600;
  line-height: 1.35;
  margin: 0 0 6px;
  min-height: 40px;
}
.item-cat {
  font-size: 18px;
  color: var(--text-mute);
  margin-bottom: 14px;
}
.item-stock {
  display: inline-block;
  font-size: 18px;
  color: var(--text-soft);
  background: var(--bg-soft);
  padding: 2px 8px;
  border-radius: 999px;
  margin-bottom: 10px;
  letter-spacing: .05em;
}
.item-stock.low { color: var(--accent); }
.item-note {
  font-size: 18px;
  color: var(--text-soft);
  margin: -6px 0 10px;
  font-style: italic;
}
.item-bottom {
  margin-top: auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
}
.item-price {
  font-size: 21px;
  font-weight: 700;
}
.item-price-unit {
  font-size: 18px;
  color: var(--text-mute);
  font-weight: 400;
}
.add-btn {
  background: var(--bg-soft);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 7px 14px;
  border-radius: var(--radius-sm);
  font-size: 18px;
  font-weight: 600;
  transition: .15s;
}
.add-btn:hover { background: var(--accent); color: #111; border-color: var(--accent); }
.add-btn.added {
  background: rgba(245, 197, 24, 0.12);
  color: var(--accent);
  border-color: var(--accent);
  font-weight: 700;
}
.add-btn.added:hover { background: var(--accent); color: #111; }

/* 卡片內的數量加減控制（加入後顯示）*/
.qty-control {
  display: inline-flex;
  align-items: center;
  background: var(--bg-soft);
  border: 1.5px solid var(--accent);
  border-radius: 999px;
  overflow: hidden;
  height: 34px;
}
.qty-btn {
  background: transparent;
  border: none;
  color: var(--text);
  width: 34px;
  height: 100%;
  font-size: 21px;
  font-weight: 700;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: .12s;
}
.qty-btn:hover { background: var(--accent); color: #111; }
.qty-btn.minus { color: var(--text-soft); }
.qty-num {
  min-width: 32px;
  padding: 0 4px;
  text-align: center;
  font-weight: 700;
  color: var(--accent);
  font-size: 18px;
  font-variant-numeric: tabular-nums;
  border-left: 1px solid var(--border);
  border-right: 1px solid var(--border);
  line-height: 34px;
}

.group-title {
  font-size: 18px;
  letter-spacing: .15em;
  color: var(--text-mute);
  text-transform: uppercase;
  margin: 28px 0 12px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border);
}
.group-title:first-child { margin-top: 0; }

.empty-state {
  padding: 60px 20px;
  text-align: center;
  color: var(--text-mute);
}

/* ============ 購物車頁 ============ */
.cart-page {
  max-width: 960px;
  margin: 0 auto;
  padding: 48px 22px 100px;
}
.cart-page h1 { margin: 0 0 8px; }
.cart-page .subtitle { color: var(--text-soft); margin: 0 0 32px; }

.cart-section {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 22px;
  margin-bottom: 20px;
}
.cart-section h2 {
  margin: 0 0 16px;
  font-size: 16px;
  letter-spacing: .05em;
}
.cart-list { margin: 0; padding: 0; list-style: none; }
.cart-item {
  display: grid;
  grid-template-columns: 52px 1fr 96px 100px 26px;
  align-items: center;
  gap: 10px;
  padding: 12px 0;
  border-bottom: 1px solid var(--border);
  font-size: 14px;
}
.cart-item:last-child { border-bottom: none; }
.cart-item-code { color: var(--accent); font-weight: 700; font-size: 13px; }
.cart-item-name { font-weight: 600; font-size: 14.5px; }
.cart-item-note { font-size: 12.5px; color: var(--text-mute); margin-top: 2px; }
.cart-item-price { color: var(--text-soft); font-size: 12.5px; margin-top: 2px; }
@media (max-width: 640px) {
  .cart-item {
    grid-template-columns: 1fr auto;
    grid-template-areas:
      "name remove"
      "info info"
      "qty total";
    gap: 6px 10px;
    padding: 14px 0;
  }
  .cart-item > :nth-child(1) { grid-area: info; order: 2; font-size: 12px; opacity: .75; }
  .cart-item > :nth-child(2) { grid-area: name; }
  .cart-item > :nth-child(3) { grid-area: qty; }
  .cart-item > :nth-child(4) { grid-area: total; text-align: right; }
  .cart-item > :nth-child(5) { grid-area: remove; }
}
.remove-btn {
  background: transparent;
  border: none;
  color: var(--text-mute);
  font-size: 16px;
  cursor: pointer;
}
.remove-btn:hover { color: var(--danger); }

.cart-summary {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 14px;
  margin-top: 14px;
  border-top: 1px solid var(--border);
  font-size: 14px;
}
.summary-row {
  display: flex;
  justify-content: space-between;
  padding: 4px 0;
}
.summary-total {
  font-size: 18px;
  font-weight: 700;
  color: var(--accent);
  padding-top: 10px;
  margin-top: 10px;
  border-top: 1px dashed var(--border);
}

/* ============ 表單 ============ */
.form-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
}
@media (max-width: 640px) { .form-grid { grid-template-columns: 1fr; } }
.form-field { display: flex; flex-direction: column; gap: 6px; }
.form-field.full { grid-column: 1 / -1; }
.form-field label { font-size: 13px; color: var(--text-soft); }
.form-field label .req { color: var(--danger); margin-left: 2px; }
.form-field input,
.form-field textarea,
.form-field select {
  background: var(--bg-soft);
  border: 1px solid var(--border);
  color: var(--text);
  padding: 9px 11px;
  border-radius: var(--radius-sm);
  font-size: 14px;
}
.form-field input:focus,
.form-field textarea:focus,
.form-field select:focus {
  outline: none;
  border-color: var(--accent);
}

/* 日期欄位：深色主題下 calendar icon 調成金黃 */
.form-field input[type="date"] {
  color-scheme: dark;
  cursor: pointer;
  font-variant-numeric: tabular-nums;
  font-size: 14px;
  padding: 9px 11px;
}
.form-field input[type="date"]::-webkit-calendar-picker-indicator {
  filter: invert(0.7) sepia(1) saturate(5) hue-rotate(0deg);
  cursor: pointer;
  opacity: .9;
}
.form-field input[type="date"]::-webkit-calendar-picker-indicator:hover {
  opacity: 1;
}

/* 租借天數即時顯示 */
.date-summary {
  grid-column: 1 / -1;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 8px 14px;
  background: var(--bg-soft);
  border: 1px dashed var(--border);
  border-radius: var(--radius-sm);
  font-size: 13px;
  color: var(--text-soft);
  margin: -4px 0 8px;
}
.date-summary strong { color: var(--accent); font-size: 15px; }
.date-quick {
  display: flex;
  gap: 6px;
  flex-wrap: wrap;
}
.date-quick button {
  background: var(--bg-soft);
  border: 1px solid var(--border);
  color: var(--text-soft);
  padding: 3px 10px;
  font-size: 12.5px;
  border-radius: 999px;
  cursor: pointer;
}
.date-quick button:hover {
  background: var(--accent);
  color: #111;
  border-color: var(--accent);
}
.submit-btn {
  display: block;
  width: 100%;
  margin-top: 8px;
  background: var(--accent);
  color: #111;
  border: none;
  padding: 13px;
  font-size: 15px;
  font-weight: 700;
  border-radius: var(--radius-sm);
  letter-spacing: .04em;
  cursor: pointer;
}
.submit-btn:hover { background: var(--accent-dim); }
.submit-btn:disabled { opacity: .5; cursor: not-allowed; }

.status-msg {
  margin-top: 14px;
  padding: 12px 14px;
  border-radius: var(--radius-sm);
  font-size: 13.5px;
  display: none;
}
.status-msg.ok { background: #173b25; color: #86efac; display: block; }
.status-msg.err { background: #3b1717; color: #ffa7a7; display: block; }

/* ============ 頁尾 ============ */
.site-footer {
  border-top: 1px solid var(--border);
  padding: 40px 22px 32px;
  margin-top: 48px;
  color: var(--text-soft);
  font-size: 18px;
  text-align: center;
}
.site-footer a { color: var(--text-soft); }
.footer-meta {
  display: inline-flex;
  flex-wrap: wrap;
  gap: 6px 10px;
  justify-content: center;
  margin-top: 14px;
  font-size: 18px;
}
.footer-meta .sep { color: var(--text-mute); opacity: .6; }
@media (max-width: 560px) {
  .footer-meta .sep { display: none; }
  .footer-meta { flex-direction: column; align-items: center; }
}

/* ============ Toast ============ */
.toast {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%) translateY(20px);
  background: var(--bg-card);
  border: 1px solid var(--accent);
  color: var(--text);
  padding: 12px 22px;
  border-radius: 999px;
  font-size: 18px;
  font-weight: 500;
  opacity: 0;
  pointer-events: none;
  transition: .2s;
  z-index: 200;
}
.toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }

/* ============ 手機版浮動購物車按鈕（FAB） ============ */
/* 只在 ≤780px 且購物車有東西時顯示 */
.mobile-cart-fab {
  display: none;
  position: fixed;
  bottom: 22px;
  right: 22px;
  width: 64px;
  height: 64px;
  border-radius: 50%;
  background: var(--accent);
  color: #111;
  align-items: center;
  justify-content: center;
  font-size: 28px;
  text-decoration: none;
  box-shadow: 0 8px 24px rgba(0,0,0,.5), 0 0 0 3px rgba(245,197,24,.25);
  z-index: 150;
  transition: transform .18s ease-out;
}
.mobile-cart-fab:active { transform: scale(.92); }
.mobile-cart-fab .fab-count {
  position: absolute;
  top: -4px; right: -4px;
  background: var(--danger);
  color: #fff;
  font-size: 15px;
  font-weight: 700;
  min-width: 24px;
  height: 24px;
  border-radius: 12px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0 7px;
  border: 2px solid var(--bg);
}
@keyframes fab-pop {
  0% { transform: scale(1); }
  50% { transform: scale(1.15); }
  100% { transform: scale(1); }
}
.mobile-cart-fab.pop { animation: fab-pop .35s ease-out; }
@media (max-width: 780px) {
  .mobile-cart-fab.visible { display: inline-flex; }
  /* 避免 toast 蓋到 FAB */
  .toast { bottom: 100px; }
}