:root {
  --bg: #ffffff;
  --sidebar-bg: #fafafa;
  --surface: #ffffff;
  --media-bg: #ffffff;
  --text: #1a1a1a;
  --text-muted: #7a7a7a;
  --border: #e6e4e0;
  --accent: #1a1a1a;
  --accent-contrast: #ffffff;
  --active-bg: #efeeea;
  --pro: #4b7a5e;
  --con: #a24a3d;
  --shadow: 0 1px 2px rgba(0, 0, 0, 0.04), 0 6px 20px rgba(0, 0, 0, 0.04);
  --radius: 2px;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #141414;
    --sidebar-bg: #1a1a1a;
    --surface: #1c1c1c;
    --media-bg: #1c1c1c;
    --text: #ededea;
    --text-muted: #9a9994;
    --border: #313029;
    --accent: #ededea;
    --accent-contrast: #141414;
    --active-bg: #262622;
    --pro: #7fb999;
    --con: #dd9284;
    --shadow: 0 1px 2px rgba(0, 0, 0, 0.4), 0 8px 24px rgba(0, 0, 0, 0.4);
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: "PingFang TC", "Noto Sans TC", "Microsoft JhengHei", system-ui, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  letter-spacing: 0.01em;
}

a { color: inherit; }

/* ---------- Header ---------- */

.site-header {
  border-bottom: 1px solid var(--border);
  background: var(--bg);
}

.header-inner {
  max-width: 1360px;
  margin: 0 auto;
  padding: 22px 32px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 14px 24px;
}

.header-inner h1 {
  font-size: 1.15rem;
  font-weight: 600;
  margin: 0;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  white-space: nowrap;
}

#search {
  flex: 0 1 280px;
  min-width: 0;
  padding: 9px 14px;
  border-radius: var(--radius);
  border: 1px solid var(--border);
  background: var(--bg);
  color: var(--text);
  font-size: 0.88rem;
}

#search:focus {
  outline: none;
  border-color: var(--accent);
}

/* ---------- Layout ---------- */

.layout {
  max-width: 1360px;
  margin: 0 auto;
  display: grid;
  grid-template-columns: 240px 1fr;
  align-items: start;
}

.sidebar {
  background: var(--sidebar-bg);
  border-right: 1px solid var(--border);
  min-height: calc(100vh - 74px);
  position: sticky;
  top: 0;
  padding: 32px 24px;
}

.sidebar-toggle {
  display: none;
  width: 100%;
  padding: 10px 14px;
  background: var(--surface);
  border: 1px solid var(--border);
  color: var(--text);
  font-size: 0.85rem;
  letter-spacing: 0.05em;
  cursor: pointer;
}

.filter-group + .filter-group {
  margin-top: 32px;
}

.filter-title {
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin: 0 0 12px;
}

.filter-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.filter-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  width: 100%;
  text-align: left;
  padding: 9px 10px;
  border: none;
  border-left: 2px solid transparent;
  background: transparent;
  color: var(--text-muted);
  font-size: 0.88rem;
  cursor: pointer;
  transition: background 0.15s ease, color 0.15s ease;
}

.filter-item:hover {
  background: var(--active-bg);
  color: var(--text);
}

.filter-item[aria-pressed="true"] {
  background: var(--active-bg);
  border-left-color: var(--accent);
  color: var(--text);
  font-weight: 600;
}

.filter-item .count {
  font-size: 0.78rem;
  color: var(--text-muted);
  font-weight: 400;
}

.filter-item-left {
  display: flex;
  align-items: center;
  gap: 6px;
  min-width: 0;
}

.category-node.expanded > .category-btn .chevron {
  transform: rotate(90deg);
}

.category-sub {
  padding: 6px 4px 14px 26px;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.facet-title {
  font-size: 0.68rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-muted);
  margin: 0 0 6px;
}

.facet-option {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 4px 0;
  font-size: 0.82rem;
  color: var(--text-muted);
  cursor: pointer;
}

.facet-option:hover {
  color: var(--text);
}

.facet-option input[type="checkbox"] {
  flex-shrink: 0;
  accent-color: var(--accent);
  cursor: pointer;
}

.facet-text {
  flex: 1;
  overflow-wrap: break-word;
}

/* ---------- Content ---------- */

.content {
  padding: 32px;
  min-width: 0;
}

.breadcrumb {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-bottom: 18px;
}

.crumb-sep {
  margin: 0 6px;
}

#breadcrumb-current {
  color: var(--text);
}

.toolbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 20px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--border);
  font-size: 0.85rem;
  color: var(--text-muted);
  gap: 12px;
  flex-wrap: wrap;
}

.toolbar-hint {
  font-size: 0.78rem;
}

.view-toggle {
  display: inline-flex;
  border: 1px solid var(--border);
}

.view-btn {
  padding: 5px 14px;
  border: none;
  background: var(--surface);
  color: var(--text-muted);
  font-size: 0.8rem;
  cursor: pointer;
}

.view-btn + .view-btn {
  border-left: 1px solid var(--border);
}

.view-btn[aria-pressed="true"] {
  background: var(--active-bg);
  color: var(--text);
  font-weight: 600;
}

.sort-label {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

.sort-label[hidden] {
  display: none;
}

#card-sort-select {
  padding: 5px 10px;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--text);
  font-size: 0.8rem;
}

/* ---------- Table ---------- */

.table-wrap {
  overflow-x: auto;
  border: 1px solid var(--border);
}

.compare-table {
  width: 100%;
  table-layout: fixed;
  border-collapse: collapse;
  background: var(--surface);
}

.compare-table th {
  position: sticky;
  top: 0;
  background: var(--sidebar-bg);
  text-align: left;
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-muted);
  padding: 12px 16px;
  border-bottom: 1px solid var(--border);
  white-space: nowrap;
}

.compare-table th.sortable {
  cursor: pointer;
  user-select: none;
}

.compare-table th.sortable:hover {
  color: var(--text);
}

.compare-table th[aria-sort] {
  color: var(--text);
}

.sort-indicator {
  display: inline-block;
  width: 10px;
  font-size: 0.65rem;
}

.compare-table td {
  padding: 14px 16px;
  border-bottom: 1px solid var(--border);
  vertical-align: top;
  font-size: 0.86rem;
  overflow-wrap: break-word;
  word-break: break-word;
}

.product-row {
  cursor: pointer;
}

.product-row:hover {
  background: var(--active-bg);
}

.product-row:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: -2px;
}

.product-row[aria-expanded="true"] {
  background: var(--active-bg);
}

.product-row[aria-expanded="true"] .chevron {
  transform: rotate(90deg);
}

.col-photo {
  width: 252px;
}

.photo-box {
  position: relative;
  overflow: hidden;
  background: var(--media-bg);
}

.photo-box img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  display: block;
}

.col-photo .photo-box {
  width: 220px;
  height: 165px;
}

.photo-nav {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 24px;
  height: 24px;
  border-radius: 50%;
  border: 1px solid var(--border);
  background: rgba(255, 255, 255, 0.85);
  color: var(--text);
  font-size: 0.95rem;
  line-height: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  padding: 0;
}

@media (prefers-color-scheme: dark) {
  .photo-nav { background: rgba(30, 30, 28, 0.85); }
}

.photo-nav.prev { left: 6px; }
.photo-nav.next { right: 6px; }

.photo-dots {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 8px;
  display: flex;
  justify-content: center;
  gap: 5px;
}

.dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  border: none;
  padding: 0;
  background: rgba(0, 0, 0, 0.25);
  cursor: pointer;
}

@media (prefers-color-scheme: dark) {
  .dot { background: rgba(255, 255, 255, 0.35); }
}

.dot[aria-pressed="true"] {
  background: var(--accent);
}

.col-brand {
  width: 200px;
}

.chevron {
  display: inline-block;
  width: 12px;
  color: var(--text-muted);
  transition: transform 0.15s ease;
}

.brand-name {
  font-weight: 600;
}

.col-brand .model {
  color: var(--text-muted);
  font-size: 0.8rem;
}

.col-brand .tag {
  display: inline-block;
  margin-top: 6px;
}

.col-specs {
  color: var(--text-muted);
  white-space: pre-line;
}

.specs-more {
  display: inline-block;
  margin-top: 4px;
  font-size: 0.74rem;
  font-style: italic;
  color: var(--text-muted);
}

.col-price {
  width: 120px;
  font-weight: 600;
  white-space: nowrap;
}

.col-type {
  width: 110px;
  color: var(--text-muted);
  white-space: nowrap;
}

.col-rating {
  width: 90px;
  color: var(--text-muted);
  white-space: nowrap;
}

/* ---------- Card view ---------- */

.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 16px;
}

.card-grid[hidden] {
  display: none;
}

.pcard {
  border: 1px solid var(--border);
  background: var(--surface);
  cursor: pointer;
  display: flex;
  flex-direction: column;
}

.pcard:hover {
  background: var(--active-bg);
}

.pcard:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: -2px;
}

.pcard[aria-expanded="true"] {
  background: var(--active-bg);
}

.pcard-media .photo-box {
  width: 100%;
  aspect-ratio: 4 / 3;
}

.pcard-body {
  padding: 14px 16px 16px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.pcard-brand .brand-name {
  font-weight: 600;
  font-size: 0.95rem;
}

.pcard-brand .model {
  color: var(--text-muted);
  font-size: 0.8rem;
}

.pcard-meta-row {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 6px 10px;
  padding-top: 8px;
  border-top: 1px solid var(--border);
}

.pcard-meta-row .price {
  font-size: 1.05rem;
  font-weight: 600;
  flex-shrink: 0;
}

.pcard-meta-right {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 6px;
  min-width: 0;
  max-width: 100%;
}

.pcard-meta-right .tag {
  max-width: 100%;
  white-space: normal;
  overflow-wrap: break-word;
}

.pcard-meta-right .rating {
  font-size: 0.68rem;
  letter-spacing: 0.06em;
  color: var(--text-muted);
}

/* ---------- Detail panel ---------- */

.detail-row td {
  padding: 0;
  cursor: default;
}

.detail-panel {
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.detail-row .detail-panel {
  padding: 18px 24px 24px 240px;
  background: var(--bg);
}

.pcard-body .detail-panel {
  padding-top: 14px;
  margin-top: 2px;
  border-top: 1px solid var(--border);
}

.detail-specs {
  margin: 0;
  font-size: 0.84rem;
  color: var(--text-muted);
  white-space: pre-line;
}

.detail-gallery {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.detail-gallery img {
  width: 96px;
  height: 96px;
  object-fit: contain;
  background: var(--media-bg);
  border: 1px solid var(--border);
}

.detail-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 10px 20px;
}

.detail-field {
  display: flex;
  flex-direction: column;
  gap: 2px;
  font-size: 0.84rem;
}

.detail-label {
  font-size: 0.7rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--text-muted);
}

.detail-value a {
  color: var(--accent);
  text-decoration: underline;
}

.tag {
  font-size: 0.68rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  padding: 2px 8px;
  border: 1px solid var(--border);
  color: var(--text-muted);
}

.pros-cons {
  font-size: 0.86rem;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.pros-cons p { margin: 0; }

.pros-cons .pro::before { content: "＋ "; color: var(--pro); font-weight: 700; }
.pros-cons .con::before { content: "－ "; color: var(--con); font-weight: 700; }

.review {
  font-size: 0.82rem;
  color: var(--text-muted);
  border-left: 2px solid var(--border);
  padding-left: 10px;
  margin: 0;
}

.empty-state {
  text-align: center;
  color: var(--text-muted);
  padding: 80px 0;
}

.site-footer {
  text-align: center;
  color: var(--text-muted);
  font-size: 0.78rem;
  padding: 24px;
  border-top: 1px solid var(--border);
}

/* ---------- Responsive ---------- */

@media (max-width: 860px) {
  .layout {
    grid-template-columns: 1fr;
  }

  .sidebar {
    position: static;
    min-height: 0;
    border-right: none;
    border-bottom: 1px solid var(--border);
    padding: 16px 20px;
  }

  .sidebar-toggle {
    display: block;
  }

  .sidebar-panel {
    display: none;
    margin-top: 16px;
  }

  .sidebar-panel.open {
    display: block;
  }

  .content {
    padding: 20px;
  }

  .header-inner {
    padding: 16px 20px;
  }

  .detail-row .detail-panel {
    padding: 16px 20px;
  }
}