:root {
  color-scheme: light;
  --color-primary: #2a483a;          /* 日系深鼠尾草綠 · 內斂低調自然 */
  --color-primary-hover: #1f362b;
  --color-primary-dark: #1f2120;     /* 極簡深石墨黑 */
  --color-primary-light: #edf3ee;    /* 淡鼠尾草微綠淺底 */
  --color-cta: #1f2120;              /* 極簡深石墨黑按鈕 · 無印現代有機高階感 */
  --color-cta-hover: #2a483a;        /* Hover 轉深鼠尾草綠 */
  --color-cta-light: #f7f7f5;
  --color-price: #1f2120;            /* 素樸深石墨黑售價 · 純淨克制 */
  --color-footer-bg: #f4f3f0;        /* 日系柔和微暖灰頁尾 · 舒服素雅 */
  --color-footer-text: #242624;      /* 深石墨黑文字 */
  --color-footer-sub: #5e615d;      /* 柔和次要文字 */
  --color-footer-border: #e2e0db;
  --color-bg-needs: #f7f7f5;
  --color-text-main: #1f2120;
  --color-text-muted: #5e615d;
  --color-text-light: #8c8e8a;
  --color-border: #ebeae6;
  --color-border-light: #f4f3f0;
  --color-card-bg: #ffffff;
  --color-bg-page: #ffffff;
  --color-bg-alt: #f9f9f8;
  --color-bg-subtle: #f7f7f5;
  --shadow-sm: 0 1px 4px rgba(0, 0, 0, 0.03);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.05);
  --shadow-lg: 0 10px 24px rgba(0, 0, 0, 0.07);
  --radius-sm: 4px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-pill: 9999px;
  --font-sans: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", -apple-system, BlinkMacSystemFont, sans-serif;
  --font-serif: Georgia, "Noto Serif SC", "Source Han Serif SC", serif;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
  font-family: var(--font-sans);
  color: var(--color-text-main);
  background-color: var(--color-bg-page);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

a { color: inherit; text-decoration: none; transition: all 0.2s ease; }
a:focus-visible { outline: 2px solid var(--color-primary); outline-offset: 3px; }
img { max-width: 100%; height: auto; display: block; }
ul { list-style: none; }

.shell {
  width: min(100% - 48px, 1280px);
  margin-inline: auto;
}

/* ==========================================================================
   1. 頂部 Announcement Bar
   ========================================================================== */
.top-bar {
  background-color: var(--color-bg-subtle);
  color: var(--color-text-main);
  font-size: 13px;
  padding: 8px 0;
  text-align: center;
  letter-spacing: 0.5px;
  border-bottom: 1px solid var(--color-border);
}
.top-bar-inner {
  display: flex;
  justify-content: center;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
}
.top-bar-badge {
  display: inline-block;
  padding: 2px 8px;
  background: var(--color-primary-light);
  border: 1px solid #d0ded4;
  border-radius: var(--radius-pill);
  color: var(--color-primary);
  font-size: 11px;
  font-weight: 600;
}

/* ==========================================================================
   2. 頂端導覽 Sticky Header
   ========================================================================== */
.site-header {
  background: rgba(255, 255, 255, 0.96);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
  position: sticky;
  top: 0;
  z-index: 100;
  transition: background 0.3s ease;
}
.site-header .shell {
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 80px;
  gap: 24px;
}
.brand-group {
  display: flex;
  flex-direction: column;
  text-decoration: none;
}
.brand-logo {
  font-family: var(--font-serif);
  font-size: 26px;
  font-weight: 700;
  color: var(--color-text-main);
  line-height: 1.1;
  display: flex;
  align-items: baseline;
  gap: 6px;
}
.brand-logo .logo-en {
  font-size: 15px;
  font-weight: 400;
  letter-spacing: 1px;
  color: var(--color-primary);
  text-transform: uppercase;
}
.brand-sub {
  font-size: 11px;
  letter-spacing: 1.5px;
  color: var(--color-text-muted);
  text-transform: uppercase;
  font-weight: 500;
  margin-top: 2px;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 28px;
}
.site-nav a {
  font-size: 15px;
  font-weight: 500;
  color: var(--color-text-main);
  min-height: 44px;
  display: inline-flex;
  align-items: center;
  position: relative;
}
.site-nav a::after {
  content: "";
  position: absolute;
  bottom: 8px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--color-primary);
  transition: width 0.25s ease;
}
.site-nav a:hover,
.site-nav a.active {
  color: var(--color-primary);
}
.site-nav a:hover::after,
.site-nav a.active::after {
  width: 100%;
}
.nav-badge-pill {
  font-size: 11px;
  background: var(--color-primary-light);
  color: var(--color-primary);
  padding: 1px 7px;
  border-radius: var(--radius-pill);
  margin-left: 6px;
  font-weight: 600;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 16px;
}
.cart-btn-indicator {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 16px;
  background: var(--color-bg-subtle);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-pill);
  font-size: 14px;
  font-weight: 500;
  color: var(--color-text-main);
  min-height: 44px;
  transition: all 0.2s ease;
}
.cart-btn-indicator:hover {
  background: #ebeae6;
  border-color: var(--color-text-main);
}
.cart-count-badge {
  background: var(--color-primary);
  color: #fff;
  font-size: 12px;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  display: inline-grid;
  place-items: center;
}

/* ==========================================================================
   3. 商品詳情版面 (products/*.html)
   ========================================================================== */
.product-page {
  padding: 36px 0 88px;
}
.back-link-bar {
  margin-bottom: 24px;
}
.back {
  display: inline-flex;
  min-height: 40px;
  align-items: center;
  gap: 6px;
  color: var(--color-text-main);
  font-size: 14px;
  font-weight: 500;
  padding: 4px 14px;
  border-radius: var(--radius-pill);
  background: var(--color-bg-subtle);
  border: 1px solid var(--color-border);
  transition: all 0.2s ease;
}
.back:hover {
  background: #ebeae6;
  border-color: var(--color-primary);
}

.product-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(0, 1.15fr);
  align-items: start;
  gap: clamp(32px, 5vw, 64px);
}

/* 商品大圖容器 */
.product-image-wrap {
  position: sticky;
  top: 100px;
}
.product-image {
  display: grid;
  place-items: center;
  width: 100%;
  aspect-ratio: 1;
  padding: 8%;
  border: 1px solid var(--color-border);
  background: #ffffff;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
}
.product-image img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: contain;
}

/* 商品決策欄位 */
.product-info {
  display: flex;
  flex-direction: column;
}
.product-info .category-label {
  margin: 0 0 10px;
  color: var(--color-primary);
  font-size: 13.5px;
  font-weight: 500;
  letter-spacing: 0.5px;
}
.product-info h1 {
  margin: 0 0 14px;
  font-family: var(--font-serif);
  font-size: clamp(26px, 3.5vw, 36px);
  font-weight: 600;
  line-height: 1.25;
  color: var(--color-text-main);
}
.product-info .sku-tag {
  display: inline-block;
  font-size: 12px;
  font-weight: 500;
  color: var(--color-text-muted);
  background: var(--color-bg-subtle);
  padding: 3px 10px;
  border-radius: var(--radius-pill);
  margin-bottom: 18px;
  width: fit-content;
}
.product-info .brief {
  margin: 0 0 24px;
  font-size: 15px;
  color: var(--color-text-muted);
  line-height: 1.7;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--color-border);
}

/* 價格與購買操作 */
.price-box {
  display: flex;
  align-items: baseline;
  gap: 14px;
  margin: 0 0 24px;
}
.price {
  margin: 0;
  font-size: 30px;
  font-weight: 600;
  color: var(--color-price);          /* 素樸深石墨黑售價 */
  font-variant-numeric: tabular-nums;
  font-family: var(--font-sans);
}
.original-price {
  font-size: 15px;
  color: var(--color-text-light);
  text-decoration: line-through;
}

.action-box {
  display: flex;
  gap: 14px;
  align-items: center;
  flex-wrap: wrap;
  margin-bottom: 28px;
}
.btn-buy-now {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 32px;
  background: var(--color-cta);       /* 極簡深石墨黑 */
  color: #ffffff;
  font-size: 15px;
  font-weight: 600;
  border-radius: var(--radius-pill);
  min-height: 48px;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.08);
  transition: all 0.25s ease;
  cursor: pointer;
  border: none;
  text-decoration: none;
}
.btn-buy-now:hover {
  background: var(--color-cta-hover);
  transform: translateY(-2px);
  box-shadow: 0 4px 14px rgba(0, 0, 0, 0.12);
}
.btn-add-cart {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 26px;
  background: #ffffff;
  color: var(--color-text-main);
  font-size: 15px;
  font-weight: 500;
  border-radius: var(--radius-pill);
  min-height: 48px;
  border: 1px solid var(--color-border);
  transition: all 0.2s ease;
  cursor: pointer;
  text-decoration: none;
}
.btn-add-cart:hover {
  background: var(--color-bg-subtle);
  border-color: var(--color-primary);
  color: var(--color-primary);
}
.btn-secondary-pill {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 20px;
  background: #ffffff;
  color: var(--color-text-muted);
  font-size: 14px;
  font-weight: 500;
  border-radius: var(--radius-pill);
  min-height: 48px;
  border: 1px dashed var(--color-border);
  transition: all 0.2s ease;
  text-decoration: none;
}
.btn-secondary-pill:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

/* 手機版底部懸浮操作列 (微信/H5 標準電商規格) */
.mobile-sticky-bar {
  display: none;
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background: rgba(255, 255, 255, 0.98);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-top: 1px solid var(--color-border);
  padding: 8px 16px max(8px, env(safe-area-inset-bottom));
  z-index: 999;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  box-shadow: 0 -4px 16px rgba(0, 0, 0, 0.04);
}
.bar-icons {
  display: flex;
  align-items: center;
  gap: 14px;
}
.bar-icon-btn {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  font-size: 11px;
  color: var(--color-text-muted);
  min-width: 44px;
  min-height: 44px;
  text-decoration: none;
  position: relative;
}
.bar-icon-btn svg {
  width: 20px;
  height: 20px;
  margin-bottom: 2px;
}
.bar-icon-btn:hover {
  color: var(--color-primary);
}
.bar-badge {
  position: absolute;
  top: 2px;
  right: 6px;
  background: var(--color-primary);
  color: #fff;
  font-size: 10px;
  min-width: 15px;
  height: 15px;
  border-radius: 50%;
  display: grid;
  place-items: center;
  padding: 0 3px;
}
.bar-buttons {
  display: flex;
  align-items: center;
  gap: 8px;
  flex: 1;
}
.bar-btn-cart {
  flex: 1;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 8px;
  background: var(--color-bg-subtle);
  color: var(--color-text-main);
  border: 1px solid var(--color-border);
  font-size: 13.5px;
  font-weight: 500;
  border-radius: var(--radius-pill);
  min-height: 44px;
  text-decoration: none;
  white-space: nowrap;
}
.bar-btn-buy {
  flex: 1.15;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 10px 8px;
  background: var(--color-cta);
  color: #ffffff;
  font-size: 14px;
  font-weight: 600;
  border-radius: var(--radius-pill);
  min-height: 44px;
  text-decoration: none;
  white-space: nowrap;
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.1);
}

/* 信任保障條 (日系素雅淺灰) */
.trust-badges-bar {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  background: var(--color-bg-subtle);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: 14px 16px;
  margin-bottom: 32px;
}
.trust-badge-item {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 12.5px;
  color: var(--color-text-main);
  font-weight: 500;
}
.trust-badge-item span.icon {
  color: var(--color-primary);
}

/* 規格成分表格 */
.facts {
  border-top: 1px solid var(--color-border);
  margin-top: 8px;
  padding-top: 24px;
}
.facts h2 {
  margin: 0 0 18px;
  font-size: 18px;
  color: var(--color-text-main);
  font-weight: 600;
}
.facts dl {
  margin: 0;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
}
.facts .row {
  display: grid;
  grid-template-columns: 120px minmax(0, 1fr);
  gap: 18px;
  padding: 14px 20px;
  border-bottom: 1px solid var(--color-border);
  font-size: 14px;
  line-height: 1.6;
  background: #ffffff;
}
.facts .row:nth-child(even) {
  background: var(--color-bg-alt);
}
.facts .row:last-child {
  border-bottom: none;
}
.facts dt {
  color: var(--color-text-main);
  font-weight: 600;
}
.facts dd {
  margin: 0;
  overflow-wrap: anywhere;
  color: var(--color-text-muted);
}

/* ==========================================================================
   4. 4 欄日系柔和微暖灰頁尾 Site Footer
   ========================================================================== */
.site-footer {
  background: var(--color-footer-bg);
  color: var(--color-footer-text);
  padding: 68px 0 28px;
  border-top: 1px solid var(--color-footer-border);
  margin-top: auto;
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 1fr 1fr 1.2fr;
  gap: 40px;
  margin-bottom: 48px;
}
.footer-col h4 {
  font-size: 15px;
  font-weight: 600;
  color: var(--color-footer-text);
  margin-bottom: 20px;
  letter-spacing: 0.5px;
}
.footer-col ul li {
  margin-bottom: 12px;
}
.footer-col ul a {
  color: var(--color-footer-sub);
  font-size: 14px;
  display: inline-flex;
  align-items: center;
  min-height: 36px;
}
.footer-col ul a:hover {
  color: var(--color-primary);
  text-decoration: underline;
}
.footer-brand-title {
  font-family: var(--font-serif);
  font-size: 22px;
  font-weight: 700;
  color: var(--color-footer-text);
  margin-bottom: 12px;
}
.footer-desc {
  font-size: 14px;
  color: var(--color-footer-sub);
  line-height: 1.7;
  margin-bottom: 20px;
}
.footer-contact-info p {
  font-size: 14px;
  color: var(--color-footer-sub);
  line-height: 1.8;
  margin-bottom: 6px;
}
.footer-contact-info strong {
  color: var(--color-footer-text);
}
.footer-compliance-box {
  background: #ffffff;
  border: 1px solid var(--color-footer-border);
  border-radius: var(--radius-sm);
  padding: 16px;
  font-size: 12px;
  color: var(--color-footer-sub);
  line-height: 1.6;
}

.footer-bottom {
  border-top: 1px solid var(--color-footer-border);
  padding-top: 24px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
  font-size: 13px;
  color: var(--color-footer-sub);
}
.payment-badges {
  display: flex;
  gap: 10px;
  align-items: center;
  font-size: 12px;
  flex-wrap: wrap;
}
.payment-badge-pill {
  background: #ffffff;
  border: 1px solid var(--color-footer-border);
  padding: 4px 10px;
  border-radius: var(--radius-sm);
  color: var(--color-footer-text);
  font-weight: 500;
}

/* ==========================================================================
   5. 響應式斷點
   ========================================================================== */
@media (max-width: 992px) {
  .product-layout {
    grid-template-columns: 1fr;
    gap: 36px;
  }
  .product-image-wrap {
    position: static;
  }
  .product-image {
    max-width: 520px;
    margin: 0 auto;
  }
  .footer-grid {
    grid-template-columns: 1fr 1fr;
    gap: 32px;
  }
}

@media (max-width: 768px) {
  .site-header .shell {
    align-items: flex-start;
    flex-direction: column;
    justify-content: center;
    padding-block: 16px;
    gap: 14px;
  }
  .product-page {
    padding: 24px 0 96px;
  }
  .mobile-sticky-bar {
    display: flex;
  }
  .trust-badges-bar {
    grid-template-columns: 1fr;
    gap: 8px;
  }
  .footer-grid {
    grid-template-columns: 1fr;
    gap: 28px;
  }
  .footer-bottom {
    flex-direction: column;
    align-items: flex-start;
  }
}

@media (max-width: 480px) {
  .shell { width: min(100% - 32px, 1280px); }
  .brand-logo { font-size: 22px; }
  .site-nav { gap: 8px 16px; flex-wrap: wrap; }
  .product-info h1 { font-size: 24px; }
  .price { font-size: 24px; }
  .action-box { flex-direction: column; align-items: stretch; }
  .btn-primary-pill, .btn-secondary-pill { width: 100%; }
  .facts .row { grid-template-columns: 1fr; gap: 4px; padding: 12px 14px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { transition: none !important; animation: none !important; }
}