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

:root {
  --gold: #B8860B;
  --gold-light: #D4A843;
  --gold-bg: #FAF6EE;
  --dark: #2C2C2C;
  --text: #444;
  --text-light: #888;
  --white: #fff;
  --border: #E8E0D0;
  --bg: #FDFBF7;
  --card-shadow: 0 2px 12px rgba(0,0,0,0.05);
  --radius: 12px;
}

body {
  font-family: 'Noto Sans TC', -apple-system, BlinkMacSystemFont, sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  padding-bottom: 80px;
}

.container {
  max-width: 680px;
  margin: 0 auto;
  padding: 0 20px;
}

/* ===== Header ===== */
.header {
  text-align: center;
  padding: 40px 20px 24px;
}

.brand-badge {
  display: inline-block;
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 3px;
  color: var(--gold);
  border: 1.5px solid var(--gold);
  padding: 4px 16px;
  border-radius: 16px;
  margin-bottom: 16px;
}

h1 {
  font-size: 28px;
  font-weight: 700;
  color: var(--dark);
  margin-bottom: 6px;
}

.subtitle {
  font-size: 14px;
  color: var(--text-light);
}

/* ===== Accordion Sections ===== */
.product-sections {
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding-bottom: 20px;
}

.accordion {
  background: var(--white);
  border-radius: var(--radius);
  box-shadow: var(--card-shadow);
  overflow: hidden;
}

.accordion-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 16px 20px;
  cursor: pointer;
  user-select: none;
  transition: background 0.2s;
}

.accordion-header:hover {
  background: var(--gold-bg);
}

.accordion-brand {
  display: flex;
  align-items: center;
  gap: 10px;
}

.accordion-brand-name {
  font-size: 17px;
  font-weight: 600;
  color: var(--dark);
}

.accordion-brand-count {
  font-size: 12px;
  color: var(--white);
  background: var(--gold);
  padding: 2px 8px;
  border-radius: 10px;
  min-width: 20px;
  text-align: center;
  display: none;
}

.accordion-brand-count.visible {
  display: inline-block;
}

.accordion-arrow {
  font-size: 12px;
  color: var(--text-light);
  transition: transform 0.3s ease;
}

.accordion.open .accordion-arrow {
  transform: rotate(180deg);
}

.accordion-body {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.35s ease;
}

.accordion.open .accordion-body {
  max-height: 3000px;
}

.accordion-inner {
  padding: 0 20px 16px;
}

/* ===== Product Row ===== */
.product-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 12px 0;
  border-bottom: 1px solid #f0ebe0;
}

.product-row:last-child {
  border-bottom: none;
}

.product-info {
  flex: 1;
  min-width: 0;
}

.product-name {
  font-size: 14px;
  font-weight: 500;
  color: var(--dark);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.product-spec {
  font-size: 12px;
  color: var(--text-light);
  margin-top: 1px;
}

.product-price {
  font-size: 14px;
  font-weight: 600;
  color: var(--gold);
  margin-right: 16px;
  white-space: nowrap;
  text-align: right;
}

.product-spbp {
  display: inline;
  font-size: 11px;
  font-weight: 400;
  color: #bbb;
  margin-left: 6px;
  vertical-align: middle;
}

.spbp-sep {
  font-size: 9px;
  vertical-align: middle;
}

.modal-spbp-row {
  display: flex;
  flex-shrink: 0;
  justify-content: space-between;
  align-items: center;
  padding: 8px 24px;
  border-top: 1px dashed var(--border);
}

.modal-spbp-label {
  font-size: 12px;
  color: var(--text-light);
}

.modal-spbp-value {
  font-size: 12px;
  color: var(--text-light);
}

.product-price-note {
  font-size: 11px;
  color: var(--text-light);
  font-weight: 400;
}

/* Quantity Control */
.qty-control {
  display: flex;
  align-items: center;
  gap: 0;
}

.qty-btn {
  width: 32px;
  height: 32px;
  border: 1.5px solid var(--border);
  background: var(--white);
  color: var(--text);
  font-size: 16px;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.15s;
  font-family: inherit;
}

.qty-btn:first-child {
  border-radius: 6px 0 0 6px;
}

.qty-btn:last-child {
  border-radius: 0 6px 6px 0;
}

.qty-btn:hover {
  background: var(--gold-bg);
  border-color: var(--gold-light);
}

.qty-btn:active {
  background: var(--gold);
  color: var(--white);
}

.qty-btn.minus {
  color: var(--text-light);
}

.qty-value {
  width: 36px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-top: 1.5px solid var(--border);
  border-bottom: 1.5px solid var(--border);
  font-size: 14px;
  font-weight: 600;
  color: var(--dark);
  background: var(--white);
}

.qty-value.active {
  color: var(--gold);
  background: var(--gold-bg);
}

/* ===== Summary Bar ===== */
.summary-bar {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background: var(--white);
  border-top: 1px solid var(--border);
  box-shadow: 0 -2px 16px rgba(0,0,0,0.06);
  z-index: 100;
  cursor: pointer;
}

.summary-bar:hover {
  background: var(--gold-bg);
}

.summary-content {
  max-width: 680px;
  margin: 0 auto;
  padding: 16px 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.summary-count {
  font-size: 14px;
  color: var(--text);
}

.summary-total {
  font-size: 22px;
  font-weight: 700;
  color: var(--gold);
}

/* ===== Modal ===== */
.modal-overlay {
  display: none;
  position: fixed;
  top: 0; left: 0; right: 0; bottom: 0;
  background: rgba(0,0,0,0.4);
  z-index: 200;
  align-items: flex-end;
  justify-content: center;
}

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

.modal {
  background: var(--white);
  border-radius: 16px 16px 0 0;
  width: 100%;
  max-width: 680px;
  max-height: 70vh;
  display: flex;
  flex-direction: column;
  animation: slideUp 0.3s ease;
}

@keyframes slideUp {
  from { transform: translateY(100%); }
  to { transform: translateY(0); }
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 20px 24px 12px;
  border-bottom: 1px solid var(--border);
}

.modal-header h2 {
  font-size: 18px;
  font-weight: 600;
  color: var(--dark);
}

.modal-close {
  background: none;
  border: none;
  font-size: 18px;
  color: var(--text-light);
  cursor: pointer;
  padding: 4px;
}

.modal-body {
  padding: 16px 24px;
  overflow-y: auto;
  flex: 1;
  flex: 1;
}

.modal-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 10px 0;
  border-bottom: 1px solid #f5f0e6;
}

.modal-item:last-child {
  border-bottom: none;
}

.modal-item-name {
  font-size: 14px;
  color: var(--dark);
}

.modal-item-qty {
  font-size: 13px;
  color: var(--text-light);
}

.modal-item-subtotal {
  font-size: 14px;
  font-weight: 600;
  color: var(--gold);
}

.modal-footer {
  padding: 16px 24px;
  border-top: 2px solid var(--gold);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-shrink: 0;
}

.modal-footer-label {
  font-size: 16px;
  font-weight: 600;
  color: var(--dark);
}

.modal-footer-total {
  font-size: 22px;
  font-weight: 700;
  color: var(--gold);
  display: block;
}

/* ===== Responsive ===== */
@media (max-width: 480px) {
  h1 {
    font-size: 24px;
  }

  .product-name {
    font-size: 13px;
  }

  .product-price {
    margin-right: 12px;
    font-size: 13px;
  }

  .qty-btn {
    width: 28px;
    height: 28px;
  }

  .qty-value {
    width: 30px;
    height: 28px;
    font-size: 13px;
  }

  .summary-content {
    padding: 14px 20px;
  }
}

/* ===== Footer ===== */
.footer {
  text-align: center;
  padding: 24px;
  border-top: 1px solid var(--border);
  font-size: 13px;
  color: var(--text-light);
}

.ig-link {
  display: inline-flex;
  align-items: center;
  vertical-align: -3px;
  margin-left: 8px;
  color: var(--text-light);
  transition: color 0.2s;
}

.ig-link:hover {
  color: var(--gold);
}