/* ── Variables ── */
:root {
  --bg: #0b0f1a;
  --surface: #141927;
  --surface-hover: #1a2035;
  --border: #252d3f;
  --border-light: #1e2538;
  --text: #e2e8f0;
  --text-secondary: #8b95a8;
  --text-muted: #4f5b6e;

  --header-bg: #060a14;
  --header-text: #e2e8f0;

  --accent: #b87333;
  --accent-light: #3d2a14;
  --accent-hover: #a0622b;

  --red: #ef4444;
  --red-bg: rgba(239, 68, 68, 0.12);
  --red-border: rgba(239, 68, 68, 0.3);
  --green: #22c55e;
  --green-bg: rgba(34, 197, 94, 0.12);
  --green-border: rgba(34, 197, 94, 0.3);
  --blue: #60a5fa;
  --blue-bg: rgba(96, 165, 250, 0.1);
  --blue-border: rgba(96, 165, 250, 0.25);
  --orange: #fb923c;
  --orange-bg: rgba(251, 146, 60, 0.1);
  --orange-border: rgba(251, 146, 60, 0.25);
  --gray-bg: #1a2035;

  --radius: 8px;
  --radius-lg: 12px;
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.3);
  --shadow: 0 1px 3px rgba(0,0,0,0.4), 0 1px 2px rgba(0,0,0,0.3);
  --shadow-lg: 0 4px 12px rgba(0,0,0,0.5);

  --font-sans: 'Noto Sans TC', system-ui, sans-serif;
  --font-mono: 'JetBrains Mono', 'Consolas', monospace;
}

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

body {
  font-family: var(--font-sans);
  background: var(--bg);
  color: var(--text);
  line-height: 1.5;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
}

/* ── Header ── */
.site-header {
  background: var(--header-bg);
  border-bottom: 3px solid var(--accent);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-inner {
  max-width: 1400px;
  margin: 0 auto;
  padding: 16px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.header-brand {
  display: flex;
  align-items: center;
  gap: 14px;
}

.brand-icon {
  width: 42px;
  height: 42px;
  background: rgba(184, 115, 51, 0.15);
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
}

.brand-title {
  font-size: 20px;
  font-weight: 700;
  color: #f1f5f9;
  letter-spacing: 0.5px;
  text-shadow: 0 0 20px rgba(184, 115, 51, 0.15);
}

.brand-sub {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--accent);
  letter-spacing: 1.5px;
  text-transform: uppercase;
  margin-top: 1px;
}

.header-meta {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--text-muted);
}

/* ── Controls ── */
.controls-bar {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
}

.controls-inner {
  max-width: 1400px;
  margin: 0 auto;
  padding: 20px 24px;
  display: flex;
  align-items: flex-end;
  gap: 20px;
  flex-wrap: wrap;
}

.selector-group {
  display: flex;
  align-items: flex-end;
  gap: 12px;
  flex: 1;
  min-width: 0;
}

.selector {
  flex: 1;
  min-width: 280px;
}

.cascading-select {
  display: flex;
  gap: 8px;
}

.cascading-select .select-wrap {
  flex-shrink: 0;
}

.cascading-select .select-wrap-entry {
  flex: 1;
  min-width: 0;
}

.selector-label {
  display: block;
  font-size: 12px;
  font-weight: 600;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: 6px;
}

.select-wrap {
  position: relative;
}

.select-wrap select {
  width: 100%;
  padding: 10px 36px 10px 14px;
  border: 1.5px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--text);
  cursor: pointer;
  appearance: none;
  transition: border-color 0.2s;
}

.select-wrap select:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(184, 115, 51, 0.2);
}

.select-wrap::after {
  content: '▾';
  position: absolute;
  right: 12px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
  pointer-events: none;
  font-size: 14px;
}

.selector-vs {
  padding-bottom: 10px;
  font-weight: 700;
  font-size: 14px;
  color: var(--text-muted);
  letter-spacing: 2px;
  flex-shrink: 0;
}

.btn-compare {
  padding: 10px 28px;
  background: var(--accent);
  color: white;
  border: none;
  border-radius: var(--radius);
  font-family: var(--font-sans);
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.2s, transform 0.1s;
  display: flex;
  align-items: center;
  gap: 6px;
  white-space: nowrap;
}

.btn-compare:hover {
  background: var(--accent-hover);
}

.btn-compare:active {
  transform: scale(0.97);
}

.btn-icon {
  font-size: 16px;
  display: inline-block;
}

.btn-compare:hover .btn-icon {
  animation: spin 0.5s ease-in-out;
}

@keyframes spin {
  from { transform: rotate(0deg); }
  to   { transform: rotate(360deg); }
}

/* ── Loading ── */
.loading-overlay {
  display: none;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 80px 20px;
  color: var(--text-secondary);
  gap: 16px;
}

.loading-overlay.active {
  display: flex;
}

.loading-spinner {
  width: 36px;
  height: 36px;
  border: 3px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: loading-spin 0.8s linear infinite;
}

@keyframes loading-spin {
  to { transform: rotate(360deg); }
}

/* ── Stats ── */
.stats-bar {
  max-width: 1400px;
  margin: 16px auto 0;
  padding: 0 24px;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
  gap: 12px;
}

.stat-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 12px 16px;
  text-align: center;
  box-shadow: var(--shadow-sm);
  transition: transform 0.2s, box-shadow 0.2s;
}

.stat-card:hover {
  transform: translateY(-1px);
  box-shadow: var(--shadow);
}

.stat-value {
  font-family: var(--font-mono);
  font-size: 24px;
  font-weight: 600;
  line-height: 1.2;
  color: var(--text);
}

.stat-label {
  font-size: 12px;
  font-weight: 500;
  color: var(--text-secondary);
  margin-top: 4px;
  letter-spacing: 0.5px;
}

.stat-changed .stat-value { color: var(--blue); }
.stat-up .stat-value { color: var(--red); }
.stat-down .stat-value { color: var(--green); }
.stat-new .stat-value { color: var(--orange); }
.stat-removed .stat-value { color: var(--text-muted); }

/* ── Mode notice ── */
.mode-notice {
  max-width: 1400px;
  margin: 12px auto 0;
  padding: 0 24px;
}

.mode-notice-inner {
  padding: 10px 16px;
  background: var(--orange-bg);
  border: 1px solid var(--orange-border);
  border-radius: var(--radius);
  font-size: 13px;
  color: var(--orange);
}

/* ── View bar ── */
.view-bar {
  max-width: 1400px;
  margin: 12px auto 0;
  padding: 0 24px;
}

.view-bar-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 12px;
}

.toggle-text-short { display: none; }


/* ── Category groups ── */
.groups-section {
  max-width: 1400px;
  margin: 12px auto 0;
  padding: 0 24px 32px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.category-group {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
}

.category-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 20px;
  cursor: pointer;
  user-select: none;
  transition: background 0.15s;
}

.category-header:hover {
  background: var(--surface-hover);
}

.category-header-left {
  display: flex;
  align-items: center;
  gap: 10px;
}

.category-arrow {
  font-size: 12px;
  color: var(--text-muted);
  transition: transform 0.2s;
  flex-shrink: 0;
}

.category-group.collapsed .category-arrow {
  transform: rotate(-90deg);
}

.category-name {
  font-size: 14px;
  font-weight: 600;
  color: var(--text);
}

.category-badges {
  display: flex;
  gap: 8px;
  align-items: center;
}

.category-count {
  font-family: var(--font-mono);
  font-size: 11px;
  padding: 2px 8px;
  border-radius: 10px;
  background: var(--border);
  color: var(--text-secondary);
}

.category-count.has-changes {
  background: var(--accent);
  color: white;
}

.category-body {
  overflow: hidden;
  transition: max-height 0.3s ease;
}

.category-group.collapsed .category-body {
  max-height: 0 !important;
}

.toggle-label {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 13px;
  color: var(--text-secondary);
  cursor: pointer;
  user-select: none;
}

.toggle-label input {
  display: none;
}

.toggle-chip {
  padding: 6px 12px;
  border: 1px solid var(--border);
  border-radius: 20px;
  background: var(--surface);
}

.toggle-switch {
  width: 38px;
  height: 20px;
  background: var(--border);
  border-radius: 10px;
  position: relative;
  transition: background 0.2s;
  flex-shrink: 0;
}

.toggle-switch::after {
  content: '';
  position: absolute;
  top: 2px;
  left: 2px;
  width: 16px;
  height: 16px;
  background: #c8d0de;
  border-radius: 50%;
  transition: transform 0.2s;
  box-shadow: var(--shadow-sm);
}

.toggle-label input:checked + .toggle-switch {
  background: var(--accent);
}

.toggle-label input:checked + .toggle-switch::after {
  transform: translateX(18px);
}

/* ── Table ── */
.table-scroll {
  overflow-x: auto;
}

.compare-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13px;
  table-layout: auto;
}

.compare-table thead {
  position: sticky;
  top: 0;
  z-index: 10;
}

.compare-table th {
  background: #0f1525;
  border-bottom: 2px solid var(--border);
  border-right: 1px solid var(--border);
  padding: 6px 12px;
  text-align: center;
  font-size: 11px;
  font-weight: 600;
  color: var(--text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.8px;
  white-space: nowrap;
}

.compare-table th:last-child {
  border-right: none;
}

/* 欄位寬度 Column widths — auto layout, only constrain non-text columns */
.th-name { white-space: nowrap; }
.th-remark { white-space: nowrap; }
.th-price { white-space: nowrap; }
.th-diff { white-space: nowrap; }
.th-pct { white-space: nowrap; }
.th-status { white-space: nowrap; }

.compare-table td {
  padding: 6px 12px;
  border-bottom: 1px solid var(--border-light);
  border-right: 1px solid var(--border-light);
  vertical-align: middle;
}

.compare-table td:last-child {
  border-right: none;
}

.compare-table tbody tr {
  transition: background 0.1s;
}

.compare-table tbody tr:hover {
  background: var(--surface-hover);
}

.compare-table tbody tr:last-child td {
  border-bottom: none;
}

.td-name {
  font-size: 13px;
  color: var(--text);
  text-align: left;
  word-break: break-word;
}

.td-price {
  font-family: var(--font-mono);
  font-size: 13px;
  text-align: right;
  white-space: nowrap;
  color: var(--text);
}

.td-price.empty {
  color: var(--text-muted);
  font-style: italic;
}

.td-remark {
  font-size: 12px;
  color: var(--text-secondary);
  text-align: center;
  white-space: nowrap;
  max-width: 200px;
  overflow: hidden;
  text-overflow: ellipsis;
}

.td-diff {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 600;
  text-align: right;
  white-space: nowrap;
}

.td-diff.up { color: var(--red); }
.td-diff.down { color: var(--green); }
.td-diff.same { color: var(--text-muted); }

.td-pct {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  text-align: right;
  white-space: nowrap;
}

.td-pct.up { color: var(--red); }
.td-pct.down { color: var(--green); }
.td-pct.same { color: var(--text-muted); }

.td-status {
  text-align: center;
}

.badge {
  display: inline-block;
  padding: 3px 10px;
  border-radius: 12px;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.3px;
}

.badge-up {
  background: var(--red-bg);
  color: var(--red);
  border: 1px solid var(--red-border);
}

.badge-down {
  background: var(--green-bg);
  color: var(--green);
  border: 1px solid var(--green-border);
}

.badge-same {
  background: var(--gray-bg);
  color: var(--text-muted);
  border: 1px solid var(--border);
}

.badge-new {
  background: var(--blue-bg);
  color: var(--blue);
  border: 1px solid var(--blue-border);
}

.badge-removed {
  background: var(--orange-bg);
  color: var(--orange);
  border: 1px solid var(--orange-border);
}

.row-new { background: rgba(96, 165, 250, 0.05); }
.row-removed { background: rgba(251, 146, 60, 0.05); }

/* ── Empty state ── */
.group-empty {
  text-align: center;
  padding: 20px;
  color: var(--text-muted);
  font-size: 13px;
}

/* ── Footer ── */
.site-footer {
  text-align: center;
  padding: 24px;
  font-size: 12px;
  color: var(--text-muted);
  border-top: 1px solid var(--border);
  margin-top: 20px;
}

.site-footer a {
  color: var(--accent);
  text-decoration: none;
}

.site-footer a:hover {
  text-decoration: underline;
}

/* ── Responsive ── */
@media (max-width: 768px) {
  .header-inner { padding: 12px 16px; }
  .brand-title { font-size: 17px; }
  .brand-sub { display: none; }
  .controls-inner {
    padding: 16px;
    flex-direction: column;
    align-items: stretch;
  }
  .selector-group {
    flex-direction: column;
    gap: 10px;
    width: 100%;
  }
  .selector { min-width: 0; width: 100%; }
  .cascading-select {
    display: flex;
    flex-wrap: nowrap;
    gap: 6px;
    width: 100%;
  }
  .cascading-select .select-wrap { flex: 1; min-width: 0; flex-shrink: 1; }
  .cascading-select .select-wrap-entry { flex: 2; min-width: 0; }
  .select-wrap select {
    width: 100%;
    padding: 8px 26px 8px 8px;
    font-size: 12px;
  }
  .select-wrap::after {
    right: 8px;
    font-size: 12px;
  }
  .selector-vs {
    text-align: center;
    padding: 0;
    width: 100%;
  }
  .btn-compare { width: 100%; justify-content: center; }
  .stats-bar {
    grid-template-columns: repeat(3, 1fr);
    padding: 0 16px;
    gap: 8px;
  }
  .stat-card { padding: 12px 8px; }
  .stat-value { font-size: 20px; }
  .stat-label { font-size: 11px; }
  .view-bar { padding: 0 16px; }
  .view-bar-inner { align-items: center; }
  .toggle-text-full { display: none; }
  .toggle-text-short { display: inline; }
  .groups-section { padding: 0 16px 32px; }
  .category-header { padding: 12px 14px; }
  .category-name { font-size: 13px; }

  /* 手機版表格改卡片式 Mobile: card layout
     Row 1: name ·················· remark
     Row 2: A價格 ················· B價格
     Row 3: 價差  幅度 ············ 狀態  */
  .compare-table { table-layout: auto; }
  .compare-table thead { display: none; }
  .compare-table tbody tr {
    display: grid;
    grid-template-columns: auto 1fr auto;
    padding: 10px 14px;
    border-bottom: 1px solid var(--border-light);
    gap: 3px 10px;
  }
  .compare-table tbody tr:last-child { border-bottom: none; }
  .compare-table td {
    border: none;
    padding: 0;
  }
  /* Row 1: name + remark */
  .compare-table .td-name {
    grid-column: 1 / 3;
    grid-row: 1;
    font-size: 12px;
    max-width: none;
    word-break: break-word;
    line-height: 1.4;
  }
  .compare-table .td-remark {
    grid-column: 3;
    grid-row: 1;
    font-size: 11px;
    max-width: none;
    text-align: right;
    white-space: nowrap;
    align-self: center;
  }
  .compare-table .td-remark:empty {
    display: none;
  }
  /* Row 2: priceA ··· priceB (分散對齊) */
  .compare-table .td-price {
    font-size: 12px;
  }
  .compare-table .td-price::before {
    font-size: 10px;
    color: var(--text-muted);
    font-family: var(--font-sans);
    margin-right: 2px;
  }
  .compare-table .td-price:nth-child(3)::before { content: 'A '; }
  .compare-table .td-price:nth-child(4)::before { content: 'B '; }
  .compare-table .td-price:nth-child(3) { grid-column: 1; grid-row: 2; }
  .compare-table .td-price:nth-child(4) { grid-column: 3; grid-row: 2; text-align: right; }
  /* Row 3: diff + pct ··· status (分散對齊、垂直置中) */
  .compare-table .td-diff { grid-column: 1; grid-row: 3; font-size: 12px; align-self: center; }
  .compare-table .td-pct { grid-column: 2; grid-row: 3; font-size: 11px; text-align: center; align-self: center; }
  .compare-table .td-status { grid-column: 3; grid-row: 3; text-align: right; align-self: center; }
  .badge { font-size: 10px; padding: 2px 8px; }
}

@media (max-width: 480px) {
  .stats-bar {
    grid-template-columns: repeat(2, 1fr);
  }
  .header-meta { display: none; }
}

/* ── Animations ── */
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

.main-content {
  animation: fadeIn 0.3s ease-out;
}