/* ============================================================
   光欣蝦舍水族 - 設計系統 CSS 變數
   Design Tokens - 未來遷移至 TailwindCSS 時對應 tailwind.config.js
   ============================================================ */

:root {
  /* === 主色系 - 海洋藍 === */
  --color-primary-50:  #eff8ff;
  --color-primary-100: #dbeefe;
  --color-primary-200: #bfe0fd;
  --color-primary-300: #93cafc;
  --color-primary-400: #60aef8;
  --color-primary-500: #3b8ef3;
  --color-primary-600: #1a6fd4;
  --color-primary-700: #1558ab;
  --color-primary-800: #17498c;
  --color-primary-900: #193e6f;

  /* === 深海色 - Hero & 強調 === */
  --color-ocean-800: #0c2d48;
  --color-ocean-900: #071c2e;

  /* === 品牌色 === */
  --color-brand:       #1a6fd4;
  --color-brand-dark:  #1558ab;
  --color-brand-light: #60aef8;

  /* === 輔助色 === */
  --color-accent:      #f97316;   /* 橙色 - CTA按鈕 */
  --color-accent-dark: #ea6c10;
  --color-success:     #22c55e;
  --color-warning:     #f59e0b;
  --color-error:       #ef4444;

  /* === 中性色 === */
  --color-white:       #ffffff;
  --color-gray-50:     #f9fafb;
  --color-gray-100:    #f3f4f6;
  --color-gray-200:    #e5e7eb;
  --color-gray-300:    #d1d5db;
  --color-gray-400:    #9ca3af;
  --color-gray-500:    #6b7280;
  --color-gray-600:    #4b5563;
  --color-gray-700:    #374151;
  --color-gray-800:    #1f2937;
  --color-gray-900:    #111827;

  /* === 文字色 === */
  --text-primary:   var(--color-gray-900);
  --text-secondary: var(--color-gray-600);
  --text-muted:     var(--color-gray-400);
  --text-white:     var(--color-white);
  --text-brand:     var(--color-brand);

  /* === 背景色 === */
  --bg-white:       var(--color-white);
  --bg-light:       var(--color-gray-50);
  --bg-section:     var(--color-primary-50);
  --bg-brand:       var(--color-brand);

  /* === 間距系統 === */
  --space-1:  0.25rem;   /* 4px */
  --space-2:  0.5rem;    /* 8px */
  --space-3:  0.75rem;   /* 12px */
  --space-4:  1rem;      /* 16px */
  --space-5:  1.25rem;   /* 20px */
  --space-6:  1.5rem;    /* 24px */
  --space-8:  2rem;      /* 32px */
  --space-10: 2.5rem;    /* 40px */
  --space-12: 3rem;      /* 48px */
  --space-16: 4rem;      /* 64px */
  --space-20: 5rem;      /* 80px */
  --space-24: 6rem;      /* 96px */

  /* === 字型 === */
  --font-sans: 'Noto Sans TC', 'Inter', system-ui, sans-serif;
  --font-size-xs:   0.75rem;
  --font-size-sm:   0.875rem;
  --font-size-base: 1rem;
  --font-size-lg:   1.125rem;
  --font-size-xl:   1.25rem;
  --font-size-2xl:  1.5rem;
  --font-size-3xl:  1.875rem;
  --font-size-4xl:  2.25rem;
  --font-size-5xl:  3rem;
  --font-weight-normal:   400;
  --font-weight-medium:   500;
  --font-weight-semibold: 600;
  --font-weight-bold:     700;
  --font-weight-extrabold:800;

  /* === 圓角 === */
  --radius-sm:   0.25rem;
  --radius-base: 0.5rem;
  --radius-md:   0.75rem;
  --radius-lg:   1rem;
  --radius-xl:   1.5rem;
  --radius-full: 9999px;

  /* === 陰影 === */
  --shadow-sm:  0 1px 2px 0 rgba(0,0,0,0.05);
  --shadow-base:0 1px 3px 0 rgba(0,0,0,0.1), 0 1px 2px -1px rgba(0,0,0,0.1);
  --shadow-md:  0 4px 6px -1px rgba(0,0,0,0.1), 0 2px 4px -2px rgba(0,0,0,0.1);
  --shadow-lg:  0 10px 15px -3px rgba(0,0,0,0.1), 0 4px 6px -4px rgba(0,0,0,0.1);
  --shadow-xl:  0 20px 25px -5px rgba(0,0,0,0.1), 0 8px 10px -6px rgba(0,0,0,0.1);
  --shadow-card:0 4px 24px rgba(26, 111, 212, 0.08);
  --shadow-hero:0 8px 40px rgba(12, 45, 72, 0.4);

  /* === 轉場動畫 === */
  --transition-fast:   150ms ease;
  --transition-base:   250ms ease;
  --transition-slow:   400ms ease;

  /* === Z-index === */
  --z-sticky:  100;
  --z-overlay: 200;
  --z-modal:   300;
  --z-toast:   400;
}

/* ============================================================
   重置與基礎
   ============================================================ */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; font-size: 16px; }
body {
  font-family: var(--font-sans);
  font-size: var(--font-size-base);
  color: var(--text-primary);
  background: var(--bg-white);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
img { max-width: 100%; height: auto; display: block; }
a { color: inherit; text-decoration: none; }
ul, ol { list-style: none; }
button { cursor: pointer; border: none; background: none; font-family: inherit; }
input, textarea, select { font-family: inherit; }

/* ============================================================
   通用工具類
   ============================================================ */
.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-4);
}
@media (min-width: 768px)  { .container { padding: 0 var(--space-6); } }
@media (min-width: 1024px) { .container { padding: 0 var(--space-8); } }

.section-padding { padding: var(--space-12) 0; }
@media (min-width: 768px) { .section-padding { padding: var(--space-16) 0; } }

/* 各內頁標題區（關於 / 聯絡 / 部落格…）統一規格：高度精簡、字級一致 */
.page-hero { padding: var(--space-12) var(--space-4); text-align: center; }
.page-hero__title {
  font-size: var(--font-size-3xl);
  font-weight: var(--font-weight-extrabold);
  line-height: 1.2;
  margin-bottom: var(--space-3);
}
.page-hero__subtitle {
  font-size: var(--font-size-base);
  line-height: 1.7;
  max-width: 600px;
  margin: 0 auto;
  opacity: 0.85;
}

.section-title {
  font-size: var(--font-size-2xl);
  font-weight: var(--font-weight-bold);
  color: var(--text-primary);
  text-align: center;
  margin-bottom: var(--space-4);
}
@media (min-width: 768px) { .section-title { font-size: var(--font-size-3xl); } }

.section-subtitle {
  font-size: var(--font-size-base);
  color: var(--text-secondary);
  text-align: center;
  margin-bottom: var(--space-12);
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

/* ============================================================
   按鈕元件 (BEM)
   ============================================================ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-6);
  border-radius: var(--radius-full);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
  transition: all var(--transition-base);
  white-space: nowrap;
  user-select: none;
}
.btn:disabled { opacity: 0.5; cursor: not-allowed; }

.btn--primary {
  background: var(--color-brand);
  color: var(--color-white);
  box-shadow: 0 4px 14px rgba(26,111,212,0.3);
}
.btn--primary:hover:not(:disabled) {
  background: var(--color-brand-dark);
  box-shadow: 0 6px 20px rgba(26,111,212,0.45);
  transform: translateY(-1px);
}

.btn--accent {
  background: var(--color-accent);
  color: var(--color-white);
  box-shadow: 0 4px 14px rgba(249,115,22,0.3);
}
.btn--accent:hover:not(:disabled) {
  background: var(--color-accent-dark);
  transform: translateY(-1px);
  box-shadow: 0 6px 20px rgba(249,115,22,0.45);
}

.btn--outline {
  background: transparent;
  color: var(--color-brand);
  border: 2px solid var(--color-brand);
}
.btn--outline:hover:not(:disabled) {
  background: var(--color-brand);
  color: var(--color-white);
}

.btn--ghost {
  background: rgba(255,255,255,0.15);
  color: var(--color-white);
  border: 1px solid rgba(255,255,255,0.3);
  backdrop-filter: blur(8px);
}
.btn--ghost:hover:not(:disabled) {
  background: rgba(255,255,255,0.25);
}

.btn--sm { padding: var(--space-2) var(--space-4); font-size: var(--font-size-xs); }
.btn--lg { padding: var(--space-4) var(--space-8); font-size: var(--font-size-lg); }
.btn--full { width: 100%; }

/* ============================================================
   導覽列 (Navbar)
   ============================================================ */
.navbar {
  position: sticky;
  top: 0;
  z-index: var(--z-sticky);
  background: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-gray-100);
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-base);
}

.navbar__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 64px;
}

.navbar__brand {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.navbar__logo {
  width: 40px;
  height: 40px;
  background: var(--color-brand);
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  color: white;
  font-weight: var(--font-weight-bold);
  flex-shrink: 0;
}

/* 社群分享按鈕（商品頁、最新消息共用） */
.share-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  border: none;
  border-radius: var(--radius-full);
  color: #fff;
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
  font-family: inherit;
  cursor: pointer;
  transition: opacity var(--transition-base), transform var(--transition-base);
}
.share-btn:hover { opacity: 0.9; transform: translateY(-1px); }
.share-btn--fb { background: #1877F2; }
.share-btn--line { background: #06C755; }

.navbar__logo-img {
  height: 46px;
  width: auto;
  display: block;
  flex-shrink: 0;
}

.navbar__brand-text { line-height: 1.2; }
.navbar__brand-name {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-bold);
  color: var(--color-ocean-800);
}
.navbar__brand-sub {
  font-size: var(--font-size-xs);
  color: var(--text-secondary);
}

.navbar__nav {
  display: none;
  align-items: center;
  gap: var(--space-6);
}
@media (min-width: 768px) { .navbar__nav { display: flex; } }

.navbar__link {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--text-secondary);
  transition: color var(--transition-fast);
  padding: var(--space-1) 0;
  position: relative;
}
.navbar__link::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--color-brand);
  transition: width var(--transition-base);
}
.navbar__link:hover,
.navbar__link--active {
  color: var(--color-brand);
}
.navbar__link:hover::after,
.navbar__link--active::after { width: 100%; }

.navbar__actions {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.navbar__member-info {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  margin-right: var(--space-2);
  padding-right: var(--space-3);
  border-right: 1px solid var(--color-gray-200);
}

.navbar__member-name {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
  color: var(--color-gray-800);
  transition: color var(--transition-base);
}
.navbar__member-name:hover {
  color: var(--color-brand);
}

.navbar__logout-btn {
  background: none;
  border: none;
  font-size: var(--font-size-sm);
  color: var(--color-gray-500);
  cursor: pointer;
  padding: 0;
  transition: color var(--transition-base);
}
.navbar__logout-btn:hover {
  color: var(--color-danger);
}

.navbar__member-link {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
  color: var(--color-gray-600);
  transition: color var(--transition-base);
}
.navbar__member-link:hover {
  color: var(--color-brand);
}
.navbar__member-divider {
  color: var(--color-gray-300);
  font-size: var(--font-size-sm);
}

.navbar__mobile-member {
  display: flex;
  flex-direction: column;
  padding: var(--space-4);
  background: var(--color-gray-50);
  border-radius: var(--radius-lg);
  margin-bottom: var(--space-4);
  gap: var(--space-3);
}
.navbar__mobile-member span {
  font-weight: var(--font-weight-bold);
  color: var(--color-gray-800);
}
.navbar__mobile-logout-btn {
  background: none;
  border: none;
  text-align: left;
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-semibold);
  color: var(--color-danger);
  padding: var(--space-2) 0;
  cursor: pointer;
}

.navbar__cart-btn {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-4);
  background: var(--color-brand);
  color: white;
  border-radius: var(--radius-full);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
  transition: all var(--transition-base);
  white-space: nowrap;
  flex-shrink: 0;
}
.navbar__cart-btn:hover {
  background: var(--color-brand-dark);
  transform: translateY(-1px);
}

.navbar__cart-badge {
  position: absolute;
  top: -6px;
  right: -6px;
  background: var(--color-accent);
  color: white;
  font-size: 10px;
  font-weight: var(--font-weight-bold);
  width: 18px;
  height: 18px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: transform var(--transition-base);
}
.navbar__cart-badge--bump { animation: cartBump 0.4s ease; }

@keyframes cartBump {
  0%   { transform: scale(1); }
  50%  { transform: scale(1.5); }
  100% { transform: scale(1); }
}

.navbar__mobile-toggle {
  display: flex;
  flex-direction: column;
  gap: 5px;
  padding: var(--space-2);
  cursor: pointer;
}
@media (min-width: 768px) { .navbar__mobile-toggle { display: none; } }

.navbar__mobile-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--color-gray-700);
  border-radius: 2px;
  transition: all var(--transition-base);
}
.navbar__mobile-toggle.is-open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.navbar__mobile-toggle.is-open span:nth-child(2) { opacity: 0; }
.navbar__mobile-toggle.is-open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* 手機選單 */
.navbar__mobile-menu {
  display: none;
  flex-direction: column;
  gap: var(--space-1);
  padding: var(--space-4);
  border-top: 1px solid var(--color-gray-100);
  background: var(--bg-white);
}
.navbar__mobile-menu.is-open { display: flex; }
@media (min-width: 768px) { .navbar__mobile-menu { display: none !important; } }

.navbar__mobile-link {
  display: block;
  padding: var(--space-3) var(--space-4);
  font-weight: var(--font-weight-medium);
  color: var(--text-secondary);
  border-radius: var(--radius-base);
  transition: all var(--transition-fast);
}
.navbar__mobile-link:hover {
  background: var(--color-primary-50);
  color: var(--color-brand);
}

/* 行動裝置導覽列 RWD 優化 */
@media (max-width: 767px) {
  .navbar__inner {
    height: 56px; /* 縮小導覽列高度 */
  }
  .navbar__logo-img {
    height: 32px; /* 縮小 Logo 圖片高度 */
  }
  .navbar__brand {
    gap: var(--space-2); /* 縮小間距 */
  }
  .navbar__brand-name {
    font-size: var(--font-size-sm); /* 縮小中文店名 */
  }
  .navbar__brand-sub {
    font-size: 9px; /* 縮小英文副標 */
    transform: scale(0.9);
    transform-origin: left center;
  }
  .navbar__actions {
    gap: var(--space-2); /* 縮小操作區間距 */
  }
  
  /* 隱藏桌機版會員/登入按鈕以節省空間，改由漢堡選單內呈現 */
  .navbar__login-btn,
  .navbar__member-info {
    display: none !important;
  }
  
  /* 縮小購物車按鈕，只保留寬度不折行 */
  .navbar__cart-btn {
    padding: 4px 10px;
    font-size: var(--font-size-xs);
    gap: var(--space-1);
  }
  .navbar__cart-badge {
    top: -5px;
    right: -5px;
    width: 16px;
    height: 16px;
    font-size: 9px;
  }
  
  /* 縮小漢堡選單按鈕 */
  .navbar__mobile-toggle {
    padding: var(--space-1);
    gap: 4px;
  }
  .navbar__mobile-toggle span {
    width: 18px;
    height: 2px;
  }
  .navbar__mobile-toggle.is-open span:nth-child(1) { transform: translateY(6px) rotate(45deg); }
  .navbar__mobile-toggle.is-open span:nth-child(3) { transform: translateY(-6px) rotate(-45deg); }
}

/* ============================================================
   Hero Banner
   ============================================================ */
.hero {
  position: relative;
  min-height: 70vh;
  display: flex;
  align-items: center;
  overflow: hidden;
  background: linear-gradient(135deg, var(--color-ocean-900) 0%, var(--color-ocean-800) 40%, var(--color-primary-800) 100%);
}

.hero__bg {
  position: absolute;
  inset: 0;
  background-image: url('../images/hero.jpg');
  background-size: cover;
  background-position: center;
  opacity: 0.3;
  transform: scale(1.05);
  animation: heroPan 20s ease-in-out infinite alternate;
}

@keyframes heroPan {
  from { transform: scale(1.05) translateX(-1%); }
  to   { transform: scale(1.1) translateX(1%); }
}

.hero__overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(
    to bottom,
    rgba(7, 28, 46, 0.3) 0%,
    rgba(7, 28, 46, 0.6) 100%
  );
}

.hero__content {
  position: relative;
  z-index: 1;
  max-width: 700px;
}

.hero__badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  background: rgba(255,255,255,0.15);
  backdrop-filter: blur(8px);
  border: 1px solid rgba(255,255,255,0.25);
  color: var(--color-white);
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-full);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  margin-bottom: var(--space-6);
  animation: fadeInUp 0.6s ease both;
}

.hero__title {
  font-size: clamp(2.2rem, 5vw, 3.6rem);
  font-weight: var(--font-weight-extrabold);
  color: var(--color-white);
  line-height: 1.1;
  margin-bottom: var(--space-6);
  animation: fadeInUp 0.6s ease 0.1s both;
}

.hero__title-highlight {
  background: linear-gradient(135deg, var(--color-brand-light), #93cafc);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero__desc {
  font-size: var(--font-size-lg);
  color: rgba(255,255,255,0.8);
  margin-bottom: var(--space-8);
  line-height: 1.7;
  animation: fadeInUp 0.6s ease 0.2s both;
}

.hero__tags {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  margin-bottom: var(--space-8);
  animation: fadeInUp 0.6s ease 0.3s both;
}

.hero__tag {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  color: rgba(255,255,255,0.9);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
}
.hero__tag-icon {
  width: 24px;
  height: 24px;
  background: rgba(255,255,255,0.15);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 12px;
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-4);
  animation: fadeInUp 0.6s ease 0.4s both;
}

.hero__scroll {
  position: absolute;
  bottom: var(--space-8);
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-2);
  color: rgba(255,255,255,0.6);
  font-size: var(--font-size-xs);
  animation: bounce 2s infinite;
}

@keyframes bounce {
  0%, 100% { transform: translateX(-50%) translateY(0); }
  50%       { transform: translateX(-50%) translateY(8px); }
}

@keyframes fadeInUp {
  from { opacity: 0; transform: translateY(20px); }
  to   { opacity: 1; transform: translateY(0); }
}

/* ============================================================
   商品卡片元件 (BEM)
   ============================================================ */
.product-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: var(--space-6);
}

.product-card {
  background: var(--bg-white);
  border-radius: var(--radius-xl);
  overflow: hidden;
  box-shadow: var(--shadow-card);
  transition: all var(--transition-base);
  border: 1px solid var(--color-gray-100);
  cursor: pointer;
}
.product-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-xl);
  border-color: var(--color-primary-200);
}

.product-card__image-wrapper {
  position: relative;
  aspect-ratio: 4/3;
  overflow: hidden;
  background: var(--color-gray-50);
}
.product-card__image {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-slow);
}
.product-card:hover .product-card__image { transform: scale(1.08); }

.product-card__badge {
  position: absolute;
  top: var(--space-3);
  left: var(--space-3);
  padding: 3px var(--space-3);
  border-radius: var(--radius-full);
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-bold);
  color: white;
}
.product-card__badge--hot     { background: #ef4444; }
.product-card__badge--new     { background: #22c55e; }
.product-card__badge--sale    { background: var(--color-accent); }
.product-card__badge--limited { background: #8b5cf6; }
.product-card__badge--gift    { background: #ec4899; }

.product-card__body {
  padding: var(--space-5);
}

.product-card__name {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-bold);
  color: var(--text-primary);
  margin-bottom: var(--space-1);
}
.product-card__name-en {
  font-size: var(--font-size-xs);
  color: var(--text-muted);
  margin-bottom: var(--space-3);
}

.product-card__pricing {
  display: flex;
  align-items: baseline;
  gap: var(--space-2);
  margin-bottom: var(--space-4);
}
.product-card__price {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-extrabold);
  color: var(--color-brand);
}
.product-card__original-price {
  font-size: var(--font-size-sm);
  color: var(--text-muted);
  text-decoration: line-through;
}
.product-card__weight {
  font-size: var(--font-size-xs);
  color: var(--text-muted);
  margin-left: auto;
}

.product-card__footer {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.product-card__sold {
  font-size: var(--font-size-xs);
  color: var(--text-muted);
  flex: 1;
}

.product-card__add-btn {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-4);
  background: var(--color-brand);
  color: white;
  border-radius: var(--radius-full);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
  transition: all var(--transition-base);
}
.product-card__add-btn:hover {
  background: var(--color-brand-dark);
  transform: scale(1.05);
}
.product-card__add-btn.is-added {
  background: var(--color-success);
  animation: addedPulse 0.4s ease;
}
@keyframes addedPulse {
  0%   { transform: scale(1); }
  50%  { transform: scale(1.15); }
  100% { transform: scale(1); }
}

/* ============================================================
   品牌特色 (Features)
   ============================================================ */
.features { background: var(--color-primary-50); }

.features-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-6);
}
@media (min-width: 768px) {
  .features-grid { grid-template-columns: repeat(4, 1fr); }
}

.feature-card {
  text-align: center;
  padding: var(--space-8) var(--space-4);
  background: white;
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-base);
}
.feature-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-md);
}

.feature-card__icon {
  width: 64px;
  height: 64px;
  background: linear-gradient(135deg, var(--color-primary-100), var(--color-primary-200));
  border-radius: var(--radius-xl);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.75rem;
  margin: 0 auto var(--space-4);
  transition: transform var(--transition-base);
}
.feature-card:hover .feature-card__icon { transform: scale(1.1) rotate(5deg); }

.feature-card__title {
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-bold);
  color: var(--text-primary);
  margin-bottom: var(--space-2);
}
.feature-card__desc {
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
  line-height: 1.6;
}

/* ============================================================
   客戶評價 (Testimonials)
   ============================================================ */
.testimonial-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-6);
}
@media (min-width: 768px) { .testimonial-grid { grid-template-columns: repeat(3, 1fr); } }

.testimonial-card {
  background: white;
  border-radius: var(--radius-xl);
  padding: var(--space-8);
  box-shadow: var(--shadow-card);
  border: 1px solid var(--color-gray-100);
  transition: all var(--transition-base);
}
.testimonial-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.testimonial-card__stars {
  color: #f59e0b;
  font-size: var(--font-size-sm);
  margin-bottom: var(--space-4);
  letter-spacing: 2px;
}

.testimonial-card__text {
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: var(--space-6);
  font-style: italic;
}

.testimonial-card__author {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.testimonial-card__avatar {
  width: 44px;
  height: 44px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--color-brand), var(--color-brand-light));
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-weight: var(--font-weight-bold);
  font-size: var(--font-size-sm);
  flex-shrink: 0;
}

.testimonial-card__name {
  font-weight: var(--font-weight-semibold);
  color: var(--text-primary);
  font-size: var(--font-size-sm);
}
.testimonial-card__location {
  font-size: var(--font-size-xs);
  color: var(--text-muted);
}

/* ============================================================
   購物車浮動按鈕 & 側邊欄
   ============================================================ */
.cart-sidebar {
  position: fixed;
  top: 0;
  right: -100%;
  width: 100%;
  max-width: 420px;
  height: 100vh;
  background: white;
  box-shadow: var(--shadow-xl);
  z-index: var(--z-overlay);
  display: flex;
  flex-direction: column;
  transition: right var(--transition-slow);
}
.cart-sidebar.is-open { right: 0; }

.cart-overlay {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.5);
  z-index: calc(var(--z-overlay) - 1);
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-base);
  backdrop-filter: blur(4px);
}
.cart-overlay.is-open { opacity: 1; visibility: visible; }

.cart-sidebar__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-6);
  border-bottom: 1px solid var(--color-gray-100);
}
.cart-sidebar__title {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-bold);
}
.cart-sidebar__close {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--color-gray-100);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  transition: all var(--transition-fast);
}
.cart-sidebar__close:hover { background: var(--color-gray-200); }

.cart-sidebar__body {
  flex: 1;
  overflow-y: auto;
  padding: var(--space-4);
}

.cart-empty {
  text-align: center;
  padding: var(--space-16) var(--space-8);
  color: var(--text-muted);
}
.cart-empty__icon { font-size: 4rem; margin-bottom: var(--space-4); }
.cart-empty__text { font-size: var(--font-size-base); margin-bottom: var(--space-4); }

.cart-item {
  display: flex;
  gap: var(--space-3);
  padding: var(--space-4) 0;
  border-bottom: 1px solid var(--color-gray-100);
}
.cart-item:last-child { border-bottom: none; }

.cart-item__image {
  width: 72px;
  height: 72px;
  border-radius: var(--radius-md);
  object-fit: cover;
  background: var(--color-gray-100);
  flex-shrink: 0;
}

.cart-item__info { flex: 1; min-width: 0; }
.cart-item__name {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
  margin-bottom: 2px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.cart-item__weight { font-size: var(--font-size-xs); color: var(--text-muted); margin-bottom: var(--space-2); }
.cart-item__price {
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-bold);
  color: var(--color-brand);
}

.cart-item__actions {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: var(--space-2);
}
.cart-item__qty {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  border: 1px solid var(--color-gray-200);
  border-radius: var(--radius-full);
  overflow: hidden;
}
.cart-item__qty-btn {
  width: 28px;
  height: 28px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-bold);
  color: var(--color-brand);
  transition: background var(--transition-fast);
}
.cart-item__qty-btn:hover { background: var(--color-primary-50); }
.cart-item__qty-num {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
  min-width: 20px;
  text-align: center;
}
.cart-item__remove {
  font-size: var(--font-size-xs);
  color: var(--text-muted);
  text-decoration: underline;
  transition: color var(--transition-fast);
}
.cart-item__remove:hover { color: var(--color-error); }

.cart-sidebar__footer {
  padding: var(--space-6);
  border-top: 1px solid var(--color-gray-100);
  background: var(--color-gray-50);
}
.cart-summary-row {
  display: flex;
  justify-content: space-between;
  margin-bottom: var(--space-2);
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
}
.cart-summary-row--total {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-bold);
  color: var(--text-primary);
  margin-bottom: var(--space-4);
  padding-top: var(--space-3);
  border-top: 1px solid var(--color-gray-200);
}

/* ============================================================
   Toast 通知
   ============================================================ */
.toast-container {
  position: fixed;
  bottom: var(--space-6);
  right: var(--space-6);
  z-index: var(--z-toast);
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.toast {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-4) var(--space-5);
  background: var(--color-gray-900);
  color: white;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-xl);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  animation: toastIn 0.3s ease;
  max-width: 320px;
}
.toast--success { background: #166534; }
.toast--error   { background: #991b1b; }
.toast--info    { background: var(--color-brand-dark); }

@keyframes toastIn {
  from { opacity: 0; transform: translateX(100%); }
  to   { opacity: 1; transform: translateX(0); }
}

/* ============================================================
   Footer
   ============================================================ */
.footer {
  background: var(--color-ocean-900);
  color: rgba(255,255,255,0.8);
  padding: var(--space-16) 0 var(--space-8);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-10);
  margin-bottom: var(--space-10);
}
@media (min-width: 768px) {
  .footer-grid { grid-template-columns: 2fr 1fr 1fr; }
}

.footer__brand-name {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-bold);
  color: white;
  margin-bottom: var(--space-3);
}
.footer__brand-desc {
  font-size: var(--font-size-sm);
  line-height: 1.8;
  margin-bottom: var(--space-5);
  color: rgba(255,255,255,0.6);
}

.footer__social {
  display: flex;
  gap: var(--space-3);
}
.footer__social-link {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-md);
  background: rgba(255,255,255,0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.1rem;
  transition: all var(--transition-base);
}
.footer__social-link:hover {
  background: var(--color-brand);
  transform: translateY(-2px);
}

.footer__col-title {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
  color: white;
  margin-bottom: var(--space-5);
  text-transform: uppercase;
  letter-spacing: 1px;
}
.footer__links { display: flex; flex-direction: column; gap: var(--space-3); }
.footer__link {
  font-size: var(--font-size-sm);
  color: rgba(255,255,255,0.6);
  transition: color var(--transition-fast);
}
.footer__link:hover { color: white; }

.footer__bottom {
  padding-top: var(--space-8);
  border-top: 1px solid rgba(255,255,255,0.1);
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  text-align: center;
  font-size: var(--font-size-xs);
  color: rgba(255,255,255,0.4);
}
@media (min-width: 768px) {
  .footer__bottom {
    flex-direction: row;
    justify-content: space-between;
    text-align: left;
  }
}

/* ============================================================
   商品列表頁篩選器
   ============================================================ */
.filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  margin-bottom: var(--space-8);
}

.filter-btn {
  padding: var(--space-2) var(--space-5);
  border-radius: var(--radius-full);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  border: 2px solid var(--color-gray-200);
  color: var(--text-secondary);
  background: white;
  transition: all var(--transition-base);
}
.filter-btn:hover,
.filter-btn.is-active {
  border-color: var(--color-brand);
  color: var(--color-brand);
  background: var(--color-primary-50);
}

/* ============================================================
   搜尋欄
   ============================================================ */
.search-bar {
  position: relative;
  margin-bottom: var(--space-6);
}
.search-bar__input {
  width: 100%;
  padding: var(--space-4) var(--space-5) var(--space-4) var(--space-12);
  border: 2px solid var(--color-gray-200);
  border-radius: var(--radius-full);
  font-size: var(--font-size-base);
  outline: none;
  transition: all var(--transition-base);
  background: white;
}
.search-bar__input:focus {
  border-color: var(--color-brand);
  box-shadow: 0 0 0 3px rgba(26, 111, 212, 0.1);
}
.search-bar__icon {
  position: absolute;
  left: var(--space-4);
  top: 50%;
  transform: translateY(-50%);
  color: var(--text-muted);
  font-size: 1.1rem;
  pointer-events: none;
}

/* ============================================================
   表單元件 (Checkout)
   ============================================================ */
.form-group { margin-bottom: var(--space-5); }
.form-label {
  display: block;
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  color: var(--text-primary);
  margin-bottom: var(--space-2);
}
.form-label--required::after {
  content: ' *';
  color: var(--color-error);
}
.form-control {
  width: 100%;
  padding: var(--space-3) var(--space-4);
  border: 2px solid var(--color-gray-200);
  border-radius: var(--radius-md);
  font-size: var(--font-size-base);
  outline: none;
  transition: all var(--transition-base);
  background: white;
}
.form-control:focus {
  border-color: var(--color-brand);
  box-shadow: 0 0 0 3px rgba(26,111,212,0.1);
}
.form-control.is-error { border-color: var(--color-error); }
.form-error {
  font-size: var(--font-size-xs);
  color: var(--color-error);
  margin-top: var(--space-1);
}

/* 付款方式選擇卡片 */
.payment-option {
  display: flex;
  align-items: center;
  gap: var(--space-4);
  padding: var(--space-4);
  border: 2px solid var(--color-gray-200);
  border-radius: var(--radius-lg);
  cursor: pointer;
  transition: all var(--transition-base);
  margin-bottom: var(--space-3);
}
.payment-option:hover { border-color: var(--color-brand); }
.payment-option.is-selected {
  border-color: var(--color-brand);
  background: var(--color-primary-50);
}
.payment-option__radio {
  width: 20px;
  height: 20px;
  border-radius: 50%;
  border: 2px solid var(--color-gray-300);
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  transition: all var(--transition-fast);
}
.payment-option.is-selected .payment-option__radio {
  border-color: var(--color-brand);
  background: var(--color-brand);
}
.payment-option.is-selected .payment-option__radio::after {
  content: '';
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: white;
}
.payment-option__icon { font-size: 1.5rem; }
.payment-option__info { flex: 1; }
.payment-option__name {
  font-weight: var(--font-weight-semibold);
  font-size: var(--font-size-sm);
}
.payment-option__note {
  font-size: var(--font-size-xs);
  color: var(--text-muted);
}

/* ============================================================
   頁面載入動畫
   ============================================================ */
.page-loader {
  position: fixed;
  inset: 0;
  background: white;
  z-index: 9999;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: opacity 0.3s ease;
}
.page-loader.is-hidden { opacity: 0; pointer-events: none; }

.loader-spinner {
  width: 48px;
  height: 48px;
  border: 4px solid var(--color-primary-100);
  border-top-color: var(--color-brand);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ============================================================
   RWD 響應式調整
   ============================================================ */
@media (max-width: 480px) {
  .hero__actions { flex-direction: column; }
  .hero__actions .btn { width: 100%; justify-content: center; }
  .cart-sidebar { max-width: 100%; }
  .toast-container { left: var(--space-4); right: var(--space-4); }
  .toast { max-width: 100%; }
}

/* ============================================================
   浮動線上客服聊天圖示 (Floating Chat Widget)
   ============================================================ */
.floating-chat {
  position: fixed;
  bottom: 24px;
  right: 24px;
  z-index: 999;
  font-family: var(--font-sans);
}

/* 浮動按鈕樣式 */
.floating-chat__btn {
  width: 56px;
  height: 56px;
  border-radius: var(--radius-full);
  background: linear-gradient(135deg, var(--color-brand) 0%, var(--color-brand-dark) 100%);
  box-shadow: 0 8px 24px rgba(26, 111, 212, 0.35);
  border: none;
  color: white;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
  position: relative;
  outline: none;
}

.floating-chat__btn:hover {
  transform: scale(1.08);
  box-shadow: 0 12px 28px rgba(26, 111, 212, 0.45);
}

/* 呼吸燈效果，僅在關閉時顯示 */
.floating-chat__btn::after {
  content: '';
  position: absolute;
  inset: -4px;
  border-radius: var(--radius-full);
  border: 2px solid var(--color-brand-light);
  opacity: 0;
  animation: floatingChatPulse 2.5s infinite;
}

@keyframes floatingChatPulse {
  0% { transform: scale(1); opacity: 0.6; }
  50% { opacity: 0.3; }
  100% { transform: scale(1.25); opacity: 0; }
}

/* 展開狀態下按鈕變灰且關閉 */
.floating-chat.is-open .floating-chat__btn {
  background: var(--color-gray-800);
  box-shadow: 0 6px 16px rgba(0, 0, 0, 0.15);
  transform: scale(1);
}

.floating-chat.is-open .floating-chat__btn::after {
  animation: none;
  display: none;
}

/* 按鈕內部的圖示切換 */
.floating-chat__icon {
  position: absolute;
  transition: all 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}

.floating-chat__icon--close {
  opacity: 0;
  transform: rotate(-90deg) scale(0.6);
}

.floating-chat.is-open .floating-chat__icon--msg {
  opacity: 0;
  transform: rotate(90deg) scale(0.6);
}

.floating-chat.is-open .floating-chat__icon--close {
  opacity: 1;
  transform: rotate(0) scale(1);
}

/* 客服卡片樣式 */
.floating-chat__card {
  position: absolute;
  bottom: 72px;
  right: 0;
  width: 310px;
  background: white;
  border-radius: var(--radius-xl);
  box-shadow: 0 12px 36px rgba(0, 0, 0, 0.15);
  border: 1px solid var(--color-gray-200);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transform: scale(0.85) translateY(20px);
  opacity: 0;
  pointer-events: none;
  transition: all 0.35s cubic-bezier(0.165, 0.84, 0.44, 1);
  transform-origin: bottom right;
}

.floating-chat.is-open .floating-chat__card {
  transform: scale(1) translateY(0);
  opacity: 1;
  pointer-events: auto;
}

/* 卡片頭部 */
.floating-chat__header {
  background: linear-gradient(135deg, var(--color-brand) 0%, var(--color-brand-dark) 100%);
  color: white;
  padding: var(--space-5);
  display: flex;
  align-items: center;
  gap: var(--space-3);
  position: relative;
}

.floating-chat__avatar {
  width: 44px;
  height: 44px;
  background: white;
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 24px;
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
}

.floating-chat__header-info {
  display: flex;
  flex-direction: column;
}

.floating-chat__title {
  margin: 0;
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-semibold);
  color: white;
  line-height: 1.2;
}

.floating-chat__status {
  margin: var(--space-1) 0 0 0;
  font-size: var(--font-size-xs);
  color: var(--color-primary-100);
  display: flex;
  align-items: center;
  gap: 6px;
}

.floating-chat__status-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background-color: var(--color-success);
  display: inline-block;
  box-shadow: 0 0 6px var(--color-success);
}

/* 卡片內容 */
.floating-chat__body {
  padding: var(--space-5);
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
  background: var(--bg-white);
}

.floating-chat__desc {
  margin: 0;
  font-size: var(--font-size-sm);
  color: var(--text-secondary);
  line-height: 1.5;
}

/* 通道按鈕樣式 */
.floating-chat__link {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3) var(--space-4);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-gray-200);
  text-decoration: none;
  color: var(--text-primary);
  background: var(--color-gray-50);
  transition: all 0.25s ease;
  position: relative;
}

.floating-chat__link:hover {
  transform: translateY(-2px);
  border-color: var(--color-primary-300);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
  background: var(--bg-white);
}

.floating-chat__link-icon {
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
}

.floating-chat__link-content {
  display: flex;
  flex-direction: column;
  flex-grow: 1;
}

.floating-chat__link-title {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
  color: var(--text-primary);
}

.floating-chat__link-sub {
  font-size: var(--font-size-xs);
  color: var(--text-muted);
  margin-top: 2px;
}

.floating-chat__link-badge {
  font-size: 10px;
  background-color: var(--color-accent);
  color: white;
  padding: 2px 6px;
  border-radius: var(--radius-full);
  font-weight: var(--font-weight-semibold);
}

/* 通道客製化 Hover 特效 */
.floating-chat__link--line:hover {
  border-color: #06C755;
  background-color: #f0fbf4;
}

.floating-chat__link--messenger:hover {
  border-color: #1877F2;
  background-color: #f0f6ff;
}

/* 客服卡片不同的面板 View */
.floating-chat__view--channels {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.floating-chat__view--qrcode {
  display: none;
  flex-direction: column;
  align-items: center;
  gap: var(--space-5);
  animation: floatingChatFadeIn 0.35s ease;
}

@keyframes floatingChatFadeIn {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

.floating-chat__qr-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-2) 0;
  width: 100%;
}

.floating-chat__qr-img {
  width: 140px;
  height: 140px;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-gray-200);
  padding: var(--space-2);
  background: white;
  box-shadow: var(--shadow-sm);
  transition: transform 0.3s ease;
}

.floating-chat__qr-img:hover {
  transform: scale(1.05);
}

.floating-chat__qr-tip {
  font-size: var(--font-size-xs);
  color: var(--text-secondary);
  text-align: center;
  line-height: 1.5;
  margin: 0;
}

/* 手機版適應 */
@media (max-width: 480px) {
  .floating-chat {
    bottom: 20px;
    right: 20px;
  }
  .floating-chat__card {
    right: -10px;
    width: calc(100vw - 40px);
    max-width: 310px;
  }
}