/* =========================================================
   TPS BILLIARDS - STYLE CHUNG
   Tone màu: Trắng - Đen - Navy Accent (#1A237E)
   Font: Inter (Sans-serif hiện đại)
   ========================================================= */

/* ----- 1. BIẾN MÀU SẮC & TYPOGRAPHY (CSS Variables) ----- */
:root {
  /* Bảng màu chính */
  --color-primary: #000000;            /* Đen - màu nhấn chính (khớp CMS) */
  --color-primary-dark: #1A1A1A;       /* Đen đậm cho hover */
  --color-primary-light: rgba(0,0,0,0.12); /* Đen nhạt cho background */
  --color-accent: #e32400;             /* Đỏ - dùng cho Sale tag */
  --color-white: #FFFFFF;
  --color-black: #0A0A0A;
  --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-success: #10B981;
  --color-danger: #EF4444;
  --color-warning: #F59E0B;

  /* Typography */
  --font-main: 'Inter', 'Roboto', -apple-system, BlinkMacSystemFont, 'Segoe 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;

  /* Spacing & layout */
  --container-max: 1280px;
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
  --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.08), 0 2px 4px -1px rgba(0,0,0,0.04);
  --shadow-lg: 0 10px 15px -3px rgba(0,0,0,0.1), 0 4px 6px -2px rgba(0,0,0,0.05);
  --shadow-xl: 0 20px 25px -5px rgba(0,0,0,0.12), 0 10px 10px -5px rgba(0,0,0,0.04);
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ----- 2. RESET & BASE ----- */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }

body {
  font-family: var(--font-main);
  font-size: var(--font-size-base);
  line-height: 1.6;
  color: var(--color-black);
  background: var(--color-white);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

img { max-width: 100%; height: auto; display: block; }

a { color: inherit; text-decoration: none; transition: color var(--transition); }
a:hover { color: var(--color-primary); }

button { font-family: inherit; cursor: pointer; border: none; background: none; }

ul, ol { list-style: none; }

input, select, textarea {
  font-family: inherit;
  font-size: var(--font-size-base);
  outline: none;
}

h1, h2, h3, h4, h5, h6 { font-weight: 700; line-height: 1.25; color: var(--color-black); }
h1 { font-size: var(--font-size-4xl); }
h2 { font-size: var(--font-size-3xl); }
h3 { font-size: var(--font-size-2xl); }
h4 { font-size: var(--font-size-xl); }

/* ----- 3. LAYOUT HELPERS ----- */
.container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 24px;
}

.section { padding: 64px 0; }
.section-title {
  font-size: var(--font-size-3xl);
  text-align: center;
  margin-bottom: 8px;
  letter-spacing: -0.5px;
}
.section-subtitle {
  text-align: center;
  color: var(--color-gray-500);
  margin-bottom: 48px;
  font-size: var(--font-size-base);
}

/* ----- 4. BUTTONS ----- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 28px;
  font-size: var(--font-size-base);
  font-weight: 600;
  border-radius: var(--radius-md);
  transition: all var(--transition);
  cursor: pointer;
  border: 2px solid transparent;
  white-space: nowrap;
}

.btn-primary {
  background: var(--color-primary);
  color: var(--color-white);
}
.btn-primary:hover {
  background: var(--color-primary-dark);
  color: var(--color-white);
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.btn-outline {
  background: transparent;
  color: var(--color-black);
  border-color: var(--color-black);
}
.btn-outline:hover {
  background: var(--color-black);
  color: var(--color-white);
}

.btn-accent {
  background: var(--color-accent);
  color: var(--color-white);
}
.btn-accent:hover {
  background: #E64A19;
  color: var(--color-white);
  transform: translateY(-2px);
}

.btn-block { width: 100%; }
.btn-lg { padding: 16px 36px; font-size: var(--font-size-lg); }
.btn-sm { padding: 8px 16px; font-size: var(--font-size-sm); }

/* ----- 5. HEADER ----- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--color-white);
  border-bottom: 1px solid var(--color-gray-200);
  box-shadow: var(--shadow-sm);
}

.header-top {
  background: var(--color-primary);
  color: var(--color-white);
  font-size: var(--font-size-sm);
  padding: 8px 0;
  text-align: center;
}

.header-main {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
  padding: 16px 0;
}

.logo {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: var(--font-size-2xl);
  font-weight: 800;
  color: var(--color-primary);
  letter-spacing: -1px;
  flex-shrink: 0;
}
.logo-icon {
  width: 36px;
  height: 36px;
  background: var(--color-primary);
  color: var(--color-white);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--font-size-lg);
}

/* Thanh tìm kiếm */
.search-bar {
  flex: 1;
  max-width: 500px;
  position: relative;
}
.search-bar input {
  width: 100%;
  padding: 12px 48px 12px 20px;
  border: 2px solid var(--color-gray-200);
  border-radius: 50px;
  background: var(--color-gray-50);
  transition: border-color var(--transition);
}
.search-bar input:focus {
  border-color: var(--color-primary);
  background: var(--color-white);
}
.search-bar button {
  position: absolute;
  right: 4px;
  top: 50%;
  transform: translateY(-50%);
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--color-primary);
  color: var(--color-white);
  display: flex;
  align-items: center;
  justify-content: center;
}

/* Menu chính */
.main-nav { display: flex; align-items: center; }
.main-nav ul { display: flex; gap: 28px; }
.main-nav a {
  font-weight: 500;
  font-size: var(--font-size-base);
  position: relative;
  padding: 4px 0;
}
.main-nav a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--color-primary);
  transition: width var(--transition);
}
.main-nav a:hover::after, .main-nav a.active::after { width: 100%; }

/* Cụm icon Tài khoản / Yêu thích / Giỏ hàng */
.header-icons {
  display: flex;
  align-items: center;
  gap: 16px;
}
.icon-btn {
  position: relative;
  width: 42px;
  height: 42px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--color-gray-50);
  color: var(--color-black);
  transition: all var(--transition);
}
.icon-btn:hover {
  background: var(--color-primary);
  color: var(--color-white);
}
.icon-btn .badge {
  position: absolute;
  top: -4px;
  right: -4px;
  min-width: 20px;
  height: 20px;
  border-radius: 50%;
  background: var(--color-accent);
  color: var(--color-white);
  font-size: 11px;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0 6px;
}

/* Nút mở menu mobile */
.menu-toggle {
  display: none;
  width: 42px;
  height: 42px;
  border-radius: 8px;
  background: var(--color-gray-50);
  font-size: 22px;
}

/* ----- 6. HERO BANNER (SLIDER) ----- */
.hero {
  position: relative;
  height: 600px;
  overflow: hidden;
  background: var(--color-gray-100);
}
.hero-slides {
  position: relative;
  width: 100%;
  height: 100%;
}
.hero-slide {
  position: absolute;
  inset: 0;
  opacity: 0;
  transition: opacity 0.8s ease-in-out;
  background-size: cover;
  background-position: center;
  display: flex;
  align-items: center;
}
.hero-slide.active { opacity: 1; }
.hero-slide::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, rgba(0,0,0,0.65), rgba(0,0,0,0.2));
}
.hero-content {
  position: relative;
  z-index: 2;
  color: var(--color-white);
  max-width: 560px;
}
.hero-content .tag {
  display: inline-block;
  padding: 6px 14px;
  background: var(--color-accent);
  color: var(--color-white);
  font-size: var(--font-size-sm);
  font-weight: 600;
  border-radius: 50px;
  margin-bottom: 16px;
  letter-spacing: 1px;
  text-transform: uppercase;
}
.hero-content h1 {
  font-size: var(--font-size-5xl);
  color: var(--color-white);
  line-height: 1.1;
  margin-bottom: 16px;
  letter-spacing: -1px;
}
.hero-content p {
  font-size: var(--font-size-lg);
  margin-bottom: 32px;
  opacity: 0.95;
}
.hero-controls {
  position: absolute;
  bottom: 32px;
  right: 32px;
  display: flex;
  gap: 8px;
  z-index: 3;
}
.hero-dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: rgba(255,255,255,0.5);
  cursor: pointer;
  transition: all var(--transition);
}
.hero-dot.active { background: var(--color-white); width: 36px; border-radius: 6px; }

.hero-arrow {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: rgba(255,255,255,0.2);
  backdrop-filter: blur(8px);
  color: var(--color-white);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 20px;
  z-index: 3;
  transition: background var(--transition);
}
.hero-arrow:hover { background: rgba(255,255,255,0.4); }
.hero-arrow.prev { left: 24px; }
.hero-arrow.next { right: 24px; }

/* ----- 7. PRODUCT CARD ----- */
.products-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.product-card {
  background: var(--color-white);
  border: 1px solid var(--color-gray-200);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: all var(--transition);
  position: relative;
  display: flex;
  flex-direction: column;
}
.product-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-xl);
  border-color: var(--color-primary);
}

.product-image {
  position: relative;
  width: 100%;
  aspect-ratio: 1 / 1;
  overflow: hidden;
  background: var(--color-gray-50);
}
.product-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s var(--transition);
}
.product-card:hover .product-image img { transform: scale(1.08); }

.product-tags {
  position: absolute;
  top: 12px;
  left: 12px;
  display: flex;
  flex-direction: column;
  gap: 6px;
  z-index: 2;
}
.tag-sale, .tag-new {
  padding: 4px 10px;
  border-radius: 4px;
  font-size: var(--font-size-xs);
  font-weight: 700;
  color: var(--color-white);
  letter-spacing: 0.5px;
}
.tag-sale { background: var(--color-accent); }
.tag-new { background: var(--color-primary); }

/* Nút action nổi trên ảnh sp */
.product-actions {
  position: absolute;
  top: 12px;
  right: 12px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  opacity: 0;
  transform: translateX(10px);
  transition: all var(--transition);
}
.product-card:hover .product-actions { opacity: 1; transform: translateX(0); }
.action-btn {
  width: 38px;
  height: 38px;
  border-radius: 50%;
  background: var(--color-white);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: var(--shadow-md);
  font-size: 16px;
  color: var(--color-black);
  transition: all var(--transition);
}
.action-btn:hover {
  background: var(--color-primary);
  color: var(--color-white);
}

/* Nút "Thêm vào giỏ nhanh" */
.quick-add {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  padding: 12px;
  background: var(--color-black);
  color: var(--color-white);
  text-align: center;
  font-weight: 600;
  font-size: var(--font-size-sm);
  transform: translateY(100%);
  transition: transform var(--transition);
  border: none;
  width: 100%;
}
.product-card:hover .quick-add { transform: translateY(0); }
.quick-add:hover { background: var(--color-primary); }

.product-info { padding: 16px; flex: 1; display: flex; flex-direction: column; }
.product-category {
  font-size: var(--font-size-xs);
  color: var(--color-gray-500);
  text-transform: uppercase;
  letter-spacing: 1px;
  margin-bottom: 4px;
}
.product-name {
  font-size: var(--font-size-base);
  font-weight: 600;
  margin-bottom: 8px;
  line-height: 1.4;
  /* Cắt 2 dòng nếu dài */
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.product-name a:hover { color: var(--color-primary); }

.product-rating {
  display: flex;
  align-items: center;
  gap: 4px;
  margin-bottom: 8px;
  font-size: var(--font-size-sm);
  color: var(--color-warning);
}
.product-rating .count { color: var(--color-gray-500); margin-left: 4px; }

.product-price {
  display: flex;
  align-items: baseline;
  gap: 8px;
  margin-top: auto;
}
.price-current {
  font-size: var(--font-size-lg);
  font-weight: 700;
  color: var(--color-primary);
}
.price-old {
  font-size: var(--font-size-sm);
  color: var(--color-gray-400);
  text-decoration: line-through;
}

/* ----- 8. PROMO BANNERS ----- */
.promo-banners {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
}
.promo-banner {
  position: relative;
  border-radius: var(--radius-xl);
  overflow: hidden;
  aspect-ratio: 21 / 9;
  display: flex;
  align-items: center;
  padding: 48px;
  color: var(--color-white);
  background-size: cover;
  background-position: center;
  cursor: pointer;
  transition: transform var(--transition);
}
.promo-banner::before {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(26,35,126,0.85), rgba(0,0,0,0.4));
}
.promo-banner:hover { transform: scale(1.02); }
.promo-banner > * { position: relative; z-index: 2; }
.promo-banner h3 {
  color: var(--color-white);
  font-size: var(--font-size-2xl);
  margin-bottom: 8px;
}
.promo-banner p { margin-bottom: 16px; opacity: 0.9; }

/* ----- 9. SKELETON LOADING ----- */
.skeleton {
  background: linear-gradient(90deg, var(--color-gray-100) 25%, var(--color-gray-200) 50%, var(--color-gray-100) 75%);
  background-size: 200% 100%;
  animation: skeleton-loading 1.4s ease-in-out infinite;
  border-radius: var(--radius-sm);
}
@keyframes skeleton-loading {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}
.skeleton-card {
  background: var(--color-white);
  border: 1px solid var(--color-gray-200);
  border-radius: var(--radius-lg);
  overflow: hidden;
}
.skeleton-img { width: 100%; aspect-ratio: 1; }
.skeleton-text { height: 14px; margin: 8px 16px; }
.skeleton-text:last-child { margin-bottom: 16px; width: 60%; }

/* ----- 10. NEWSLETTER ----- */
.newsletter {
  background: var(--color-primary);
  color: var(--color-white);
  padding: 64px 0;
  text-align: center;
}
.newsletter h2 { color: var(--color-white); margin-bottom: 8px; }
.newsletter p { opacity: 0.9; margin-bottom: 32px; }
.newsletter-form {
  display: flex;
  gap: 12px;
  max-width: 480px;
  margin: 0 auto;
}
.newsletter-form input {
  flex: 1;
  padding: 14px 20px;
  border-radius: var(--radius-md);
  border: none;
}

/* ----- 11. FOOTER ----- */
.site-footer {
  background: var(--color-black);
  color: var(--color-gray-300);
  padding: 64px 0 24px;
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1fr;
  gap: 48px;
  margin-bottom: 48px;
}
.footer-col h4 {
  color: var(--color-white);
  font-size: var(--font-size-base);
  margin-bottom: 20px;
  text-transform: uppercase;
  letter-spacing: 1px;
}
.footer-col ul li { margin-bottom: 10px; }
.footer-col a { font-size: var(--font-size-sm); color: var(--color-gray-300); }
.footer-col a:hover { color: var(--color-white); }
.footer-col p { font-size: var(--font-size-sm); margin-bottom: 12px; line-height: 1.7; }

.social-links { display: flex; gap: 12px; margin-top: 20px; }
.social-links a {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: rgba(255,255,255,0.1);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-white);
  transition: background var(--transition);
}
.social-links a:hover { background: var(--color-primary); }

.footer-bottom {
  border-top: 1px solid rgba(255,255,255,0.1);
  padding-top: 24px;
  text-align: center;
  font-size: var(--font-size-sm);
  color: var(--color-gray-400);
}

/* ----- 12. BREADCRUMB ----- */
.breadcrumb {
  background: var(--color-gray-50);
  padding: 16px 0;
  border-bottom: 1px solid var(--color-gray-200);
}
.breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  font-size: var(--font-size-sm);
  color: var(--color-gray-500);
}
.breadcrumb li::after { content: '/'; margin-left: 8px; color: var(--color-gray-400); }
.breadcrumb li:last-child::after { content: ''; }
.breadcrumb li:last-child { color: var(--color-primary); font-weight: 600; }

/* ----- 13. SHOP PAGE - SIDEBAR FILTER ----- */
.shop-layout {
  display: grid;
  grid-template-columns: 280px 1fr;
  gap: 32px;
  padding: 32px 0 80px;
}
.shop-sidebar {
  background: var(--color-white);
  border: 1px solid var(--color-gray-200);
  border-radius: var(--radius-lg);
  padding: 24px;
  height: fit-content;
  position: sticky;
  top: 100px;
}
.filter-group { margin-bottom: 28px; padding-bottom: 28px; border-bottom: 1px solid var(--color-gray-200); }
.filter-group:last-child { border-bottom: none; margin-bottom: 0; padding-bottom: 0; }
.filter-title {
  font-size: var(--font-size-base);
  font-weight: 700;
  margin-bottom: 16px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.filter-list label {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 6px 0;
  font-size: var(--font-size-sm);
  cursor: pointer;
  transition: color var(--transition);
}
.filter-list label:hover { color: var(--color-primary); }
.filter-list input[type="checkbox"] { accent-color: var(--color-primary); width: 16px; height: 16px; }
.filter-list .count { margin-left: auto; color: var(--color-gray-400); font-size: var(--font-size-xs); }

/* Price slider */
.price-slider { position: relative; height: 6px; background: var(--color-gray-200); border-radius: 3px; margin: 24px 8px; }
.price-slider .range-fill { position: absolute; height: 100%; background: var(--color-primary); border-radius: 3px; }
.price-range-inputs { display: flex; gap: 12px; align-items: center; font-size: var(--font-size-sm); }
.price-range-inputs input {
  width: 100%;
  padding: 8px 12px;
  border: 1px solid var(--color-gray-300);
  border-radius: var(--radius-sm);
}

/* Color swatch */
.color-list { display: flex; flex-wrap: wrap; gap: 10px; }
.color-swatch {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  border: 2px solid var(--color-gray-200);
  cursor: pointer;
  transition: all var(--transition);
}
.color-swatch:hover, .color-swatch.active {
  border-color: var(--color-primary);
  transform: scale(1.1);
}

/* Size buttons */
.size-list { display: flex; flex-wrap: wrap; gap: 8px; }
.size-btn {
  padding: 8px 14px;
  border: 1px solid var(--color-gray-300);
  border-radius: var(--radius-sm);
  font-size: var(--font-size-sm);
  font-weight: 600;
  background: var(--color-white);
  cursor: pointer;
  transition: all var(--transition);
}
.size-btn:hover, .size-btn.active {
  border-color: var(--color-primary);
  background: var(--color-primary);
  color: var(--color-white);
}

/* Shop main */
.shop-main { min-width: 0; }
.shop-toolbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 24px;
  flex-wrap: wrap;
  gap: 16px;
}
.shop-toolbar .result-count { color: var(--color-gray-500); font-size: var(--font-size-sm); }
.sort-select {
  padding: 10px 16px;
  border: 1px solid var(--color-gray-300);
  border-radius: var(--radius-md);
  background: var(--color-white);
  font-weight: 500;
  cursor: pointer;
}

/* Pagination */
.pagination {
  display: flex;
  justify-content: center;
  gap: 6px;
  margin-top: 48px;
}
.pagination button {
  min-width: 40px;
  height: 40px;
  border-radius: var(--radius-sm);
  background: var(--color-white);
  border: 1px solid var(--color-gray-300);
  font-weight: 600;
  transition: all var(--transition);
}
.pagination button:hover, .pagination button.active {
  background: var(--color-primary);
  color: var(--color-white);
  border-color: var(--color-primary);
}

/* ----- 14. PRODUCT DETAIL ----- */
.product-detail {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  padding: 48px 0;
}

/* Gallery */
.product-gallery .main-image {
  position: relative;
  width: 100%;
  aspect-ratio: 1;
  overflow: hidden;
  border-radius: var(--radius-lg);
  background: var(--color-gray-50);
  cursor: zoom-in;
}
.product-gallery .main-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.4s ease;
}
.product-gallery .main-image.zoomed img { transform: scale(1.8); cursor: zoom-out; }
.thumbs {
  display: grid;
  grid-template-columns: repeat(5, 1fr);
  gap: 8px;
  margin-top: 12px;
}
.thumbs button {
  border: 2px solid transparent;
  border-radius: var(--radius-md);
  overflow: hidden;
  aspect-ratio: 1;
  transition: border-color var(--transition);
}
.thumbs button.active { border-color: var(--color-primary); }
.thumbs img { width: 100%; height: 100%; object-fit: cover; }

/* Info */
.product-info-detail h1 {
  font-size: var(--font-size-3xl);
  margin-bottom: 12px;
}
.product-meta {
  display: flex;
  gap: 24px;
  margin-bottom: 16px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--color-gray-200);
  font-size: var(--font-size-sm);
}
.product-meta .rating { color: var(--color-warning); }
.product-meta span { color: var(--color-gray-600); }

.detail-price {
  display: flex;
  align-items: baseline;
  gap: 12px;
  margin: 16px 0 24px;
}
.detail-price .price-current { font-size: var(--font-size-3xl); }
.detail-price .price-old { font-size: var(--font-size-lg); }
.detail-price .discount {
  background: var(--color-accent);
  color: var(--color-white);
  padding: 4px 10px;
  border-radius: var(--radius-sm);
  font-size: var(--font-size-sm);
  font-weight: 700;
}

.short-desc {
  color: var(--color-gray-600);
  margin-bottom: 24px;
  line-height: 1.7;
}

.option-group {
  margin-bottom: 20px;
}
.option-group .label {
  display: block;
  font-size: var(--font-size-sm);
  font-weight: 600;
  margin-bottom: 10px;
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

/* Quantity selector */
.qty-selector {
  display: inline-flex;
  align-items: center;
  border: 1px solid var(--color-gray-300);
  border-radius: var(--radius-md);
  overflow: hidden;
}
.qty-selector button {
  width: 40px;
  height: 44px;
  font-size: var(--font-size-lg);
  font-weight: 700;
  background: var(--color-gray-50);
  transition: background var(--transition);
}
.qty-selector button:hover { background: var(--color-gray-200); }
.qty-selector input {
  width: 50px;
  height: 44px;
  text-align: center;
  border: none;
  font-weight: 600;
  border-left: 1px solid var(--color-gray-200);
  border-right: 1px solid var(--color-gray-200);
}

.detail-actions {
  display: flex;
  gap: 12px;
  margin: 28px 0;
}
.detail-actions .btn { flex: 1; }

.product-features {
  background: var(--color-gray-50);
  border-radius: var(--radius-md);
  padding: 20px;
  margin-top: 16px;
}
.product-features .feature {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 8px 0;
  font-size: var(--font-size-sm);
}
.product-features .feature i {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--color-white);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-primary);
}

/* Tabs */
.product-tabs { padding: 32px 0; }
.tab-nav {
  display: flex;
  gap: 32px;
  border-bottom: 2px solid var(--color-gray-200);
  margin-bottom: 32px;
  flex-wrap: wrap;
}
.tab-nav button {
  padding: 12px 0;
  font-weight: 600;
  font-size: var(--font-size-lg);
  color: var(--color-gray-500);
  position: relative;
  transition: color var(--transition);
}
.tab-nav button.active { color: var(--color-black); }
.tab-nav button.active::after {
  content: '';
  position: absolute;
  bottom: -2px;
  left: 0;
  right: 0;
  height: 2px;
  background: var(--color-primary);
}
.tab-content { display: none; line-height: 1.8; }
.tab-content.active { display: block; }
.tab-content h3 { margin: 24px 0 12px; }
.tab-content ul { padding-left: 24px; list-style: disc; }
.tab-content ul li { margin-bottom: 6px; }

.spec-table {
  width: 100%;
  border-collapse: collapse;
}
.spec-table tr { border-bottom: 1px solid var(--color-gray-200); }
.spec-table td { padding: 12px 16px; }
.spec-table td:first-child {
  font-weight: 600;
  width: 240px;
  background: var(--color-gray-50);
  color: var(--color-gray-700);
}

/* Reviews */
.review-item {
  padding: 20px 0;
  border-bottom: 1px solid var(--color-gray-200);
}
.review-head {
  display: flex;
  justify-content: space-between;
  margin-bottom: 8px;
}
.review-author { font-weight: 700; }
.review-date { font-size: var(--font-size-sm); color: var(--color-gray-500); }
.review-rating { color: var(--color-warning); margin-bottom: 8px; }

/* ----- 15. CART PAGE ----- */
.cart-layout {
  display: grid;
  grid-template-columns: 1fr 380px;
  gap: 32px;
  padding: 32px 0 80px;
}
.cart-items {
  background: var(--color-white);
  border: 1px solid var(--color-gray-200);
  border-radius: var(--radius-lg);
  overflow: hidden;
}
.cart-item {
  display: grid;
  grid-template-columns: 100px 1fr auto auto auto;
  gap: 20px;
  padding: 20px;
  align-items: center;
  border-bottom: 1px solid var(--color-gray-200);
}
.cart-item:last-child { border-bottom: none; }
.cart-item img {
  width: 100px;
  height: 100px;
  object-fit: cover;
  border-radius: var(--radius-md);
}
.cart-item-info .name {
  font-weight: 600;
  margin-bottom: 4px;
}
.cart-item-info .variant {
  font-size: var(--font-size-sm);
  color: var(--color-gray-500);
}
.cart-item-price { font-weight: 700; color: var(--color-primary); }
.cart-item-remove {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  color: var(--color-gray-400);
  font-size: 18px;
  transition: all var(--transition);
}
.cart-item-remove:hover { background: var(--color-danger); color: var(--color-white); }

.cart-empty {
  text-align: center;
  padding: 80px 24px;
}
.cart-empty i {
  font-size: 80px;
  color: var(--color-gray-300);
  margin-bottom: 24px;
}
.cart-empty h3 { margin-bottom: 12px; }
.cart-empty p { color: var(--color-gray-500); margin-bottom: 24px; }

/* Order summary */
.order-summary {
  background: var(--color-gray-50);
  border-radius: var(--radius-lg);
  padding: 24px;
  height: fit-content;
  position: sticky;
  top: 100px;
}
.order-summary h3 { margin-bottom: 20px; }
.summary-row {
  display: flex;
  justify-content: space-between;
  padding: 10px 0;
  font-size: var(--font-size-sm);
}
.summary-row.total {
  border-top: 2px solid var(--color-gray-300);
  margin-top: 12px;
  padding-top: 16px;
  font-size: var(--font-size-lg);
  font-weight: 700;
}
.summary-row.total .value { color: var(--color-primary); }

.coupon-input {
  display: flex;
  gap: 8px;
  margin: 20px 0;
}
.coupon-input input {
  flex: 1;
  padding: 10px 14px;
  border: 1px solid var(--color-gray-300);
  border-radius: var(--radius-md);
}

/* ----- 16. CHECKOUT PAGE ----- */
.checkout-layout {
  display: grid;
  grid-template-columns: 1fr 420px;
  gap: 40px;
  padding: 32px 0 80px;
}
.checkout-form .form-section {
  background: var(--color-white);
  border: 1px solid var(--color-gray-200);
  border-radius: var(--radius-lg);
  padding: 24px;
  margin-bottom: 20px;
}
.checkout-form h3 {
  margin-bottom: 20px;
  display: flex;
  align-items: center;
  gap: 8px;
}
.checkout-form h3 .num {
  width: 30px;
  height: 30px;
  border-radius: 50%;
  background: var(--color-primary);
  color: var(--color-white);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: var(--font-size-base);
}
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; margin-bottom: 16px; }
.form-group { display: flex; flex-direction: column; }
.form-group label {
  font-size: var(--font-size-sm);
  font-weight: 600;
  margin-bottom: 6px;
}
.form-group input, .form-group select, .form-group textarea {
  padding: 12px 14px;
  border: 1px solid var(--color-gray-300);
  border-radius: var(--radius-md);
  transition: border-color var(--transition);
}
.form-group input:focus, .form-group select:focus, .form-group textarea:focus {
  border-color: var(--color-primary);
}

/* Payment/shipping options */
.payment-options { display: flex; flex-direction: column; gap: 10px; }
.payment-option {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 16px;
  border: 1px solid var(--color-gray-300);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition);
}
.payment-option:hover, .payment-option.active {
  border-color: var(--color-primary);
  background: var(--color-primary-light);
}
.payment-option input[type="radio"] { accent-color: var(--color-primary); }
.payment-option .icon {
  width: 40px;
  height: 40px;
  border-radius: var(--radius-sm);
  background: var(--color-gray-100);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-primary);
  font-size: 18px;
}
.payment-option .info { flex: 1; }
.payment-option .info .title { font-weight: 600; }
.payment-option .info .desc { font-size: var(--font-size-sm); color: var(--color-gray-500); }

/* Order summary in checkout */
.checkout-summary { position: sticky; top: 100px; height: fit-content; }
.summary-product {
  display: flex;
  gap: 12px;
  padding: 10px 0;
  border-bottom: 1px dashed var(--color-gray-200);
  font-size: var(--font-size-sm);
}
.summary-product img {
  width: 56px;
  height: 56px;
  border-radius: var(--radius-sm);
  object-fit: cover;
}
.summary-product .info { flex: 1; }
.summary-product .info .name { font-weight: 600; }
.summary-product .info .qty { color: var(--color-gray-500); font-size: var(--font-size-xs); }
.summary-product .price { font-weight: 700; }

/* ----- 17. TOAST NOTIFICATION ----- */
.toast-container {
  position: fixed;
  top: 24px;
  right: 24px;
  z-index: 1000;
  display: flex;
  flex-direction: column;
  gap: 8px;
}
.toast {
  background: var(--color-white);
  padding: 14px 20px;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-xl);
  border-left: 4px solid var(--color-success);
  display: flex;
  align-items: center;
  gap: 12px;
  min-width: 280px;
  animation: toast-in 0.3s ease;
  font-size: var(--font-size-sm);
}
.toast.error { border-left-color: var(--color-danger); }
.toast.error i { color: var(--color-danger); }
.toast i { color: var(--color-success); font-size: 20px; }
@keyframes toast-in {
  from { transform: translateX(120%); opacity: 0; }
  to { transform: translateX(0); opacity: 1; }
}