/* ============ Reset & Base ============ */
* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  font-family: 'Inter', system-ui, -apple-system, sans-serif;
  color: var(--text-dark);
  background: var(--bg);
  line-height: 1.5;
}
h1, h2, h3, h4 { font-family: 'Poppins', sans-serif; line-height: 1.2; }
a { text-decoration: none; color: inherit; }
img { max-width: 100%; display: block; }
ul { list-style: none; }
button { font-family: inherit; cursor: pointer; border: none; background: none; }
input, select, textarea { font-family: inherit; }

/* ============ Variables ============ */
:root {
  --primary: #4f46e5;
  --primary-dark: #4338ca;
  --accent: #f59e0b;
  --text-dark: #111827;
  --text-light: #6b7280;
  --bg: #ffffff;
  --bg-alt: #f9fafb;
  --border: #e5e7eb;
  --success: #16a34a;
  --danger: #dc2626;
  --radius: 10px;
  --container-width: 1200px;
}

/* ============ Layout ============ */
.container {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 24px;
}
section { padding: 64px 0; }

/* ============ Buttons ============ */
.btn {
  display: inline-block;
  padding: 12px 28px;
  border-radius: var(--radius);
  font-weight: 600;
  font-size: 0.95rem;
  transition: all 0.2s ease;
  text-align: center;
}
.btn-primary { background: var(--primary); color: #fff; }
.btn-primary:hover { background: var(--primary-dark); }
.btn-outline { background: transparent; color: var(--primary); border: 2px solid var(--primary); }
.btn-outline:hover { background: var(--primary); color: #fff; }
.btn-lg { padding: 14px 36px; font-size: 1.05rem; width: 100%; }
.btn-add-cart { width: 100%; margin-top: 12px; }

/* ============ Header ============ */
.site-header {
  position: sticky;
  top: 0;
  background: #fff;
  border-bottom: 1px solid var(--border);
  z-index: 100;
}
.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 24px;
  position: relative;
}
.logo {
  font-family: 'Poppins', sans-serif;
  font-weight: 700;
  font-size: 1.5rem;
  white-space: nowrap;
}
.logo span { color: var(--primary); }
.nav-links {
  display: flex;
  gap: 32px;
}
.nav-links a {
  font-weight: 500;
  transition: color 0.2s;
}
.nav-links a:hover, .nav-links a.active { color: var(--primary); }
.header-icons {
  display: flex;
  align-items: center;
  gap: 20px;
}
.search-toggle, .nav-toggle {
  color: var(--text-dark);
  display: flex;
}
.cart-icon {
  position: relative;
  display: flex;
  color: var(--text-dark);
}
.cart-count {
  position: absolute;
  top: -8px;
  right: -10px;
  background: var(--primary);
  color: #fff;
  font-size: 0.7rem;
  font-weight: 700;
  min-width: 18px;
  height: 18px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0 4px;
}
.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 24px;
}
.nav-toggle span {
  display: block;
  height: 2px;
  background: var(--text-dark);
  border-radius: 2px;
  transition: all 0.2s;
}
.search-bar {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.25s ease;
}
.search-bar.open {
  max-height: 70px;
  border-bottom: 1px solid var(--border);
}
.search-bar .container { padding: 14px 24px; }
.search-bar input {
  width: 100%;
  padding: 10px 16px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-size: 0.95rem;
}

/* ============ Hero ============ */
.hero {
  display: flex;
  align-items: center;
  gap: 48px;
  padding: 80px 24px;
  max-width: var(--container-width);
  margin: 0 auto;
}
.hero-content { flex: 1; }
.hero-content h1 { font-size: 3rem; margin-bottom: 20px; }
.hero-content p {
  color: var(--text-light);
  font-size: 1.1rem;
  margin-bottom: 32px;
  max-width: 480px;
}
.hero-buttons { display: flex; gap: 16px; }
.hero-image { flex: 1; }
.hero-image img {
  border-radius: 16px;
  width: 100%;
  aspect-ratio: 4/3;
  object-fit: cover;
}

/* ============ Section headings ============ */
.section-heading { text-align: center; margin-bottom: 40px; }
.section-heading h2 { font-size: 2rem; margin-bottom: 8px; }
.section-heading p { color: var(--text-light); }

/* ============ Categories ============ */
.category-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}
.category-card {
  position: relative;
  border-radius: var(--radius);
  overflow: hidden;
  aspect-ratio: 1;
}
.category-card img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.3s;
}
.category-card:hover img { transform: scale(1.05); }
.category-card .label {
  position: absolute;
  bottom: 16px;
  left: 16px;
  background: rgba(255,255,255,0.92);
  padding: 8px 16px;
  border-radius: 8px;
  font-weight: 600;
  font-size: 0.9rem;
}

/* ============ Product Grid & Card ============ */
.product-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 28px;
}
.product-card {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 16px;
  transition: box-shadow 0.2s;
}
.product-card:hover { box-shadow: 0 8px 24px rgba(0,0,0,0.08); }
.product-card-image {
  position: relative;
  border-radius: 8px;
  overflow: hidden;
  margin-bottom: 14px;
  aspect-ratio: 1;
}
.product-card-image img { width: 100%; height: 100%; object-fit: cover; }
.badge-sale {
  position: absolute;
  top: 10px;
  left: 10px;
  background: var(--danger);
  color: #fff;
  font-size: 0.7rem;
  font-weight: 700;
  padding: 4px 10px;
  border-radius: 20px;
  z-index: 2;
}
.product-category {
  font-size: 0.75rem;
  color: var(--text-light);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}
.product-name {
  font-size: 1rem;
  font-weight: 600;
  margin: 6px 0;
  font-family: 'Inter', sans-serif;
}
.stars { color: var(--accent); font-size: 0.85rem; margin-bottom: 8px; }
.review-count { color: var(--text-light); font-size: 0.8rem; }
.price-row { display: flex; align-items: baseline; gap: 8px; }
.price { font-weight: 700; font-size: 1.1rem; }
.price-lg { font-size: 1.6rem; }
.old-price { text-decoration: line-through; color: var(--text-light); font-size: 0.9rem; }

/* ============ Promo Banner ============ */
.promo-banner {
  background: var(--primary);
  color: #fff;
  text-align: center;
  padding: 20px 0;
  font-weight: 600;
}

/* ============ Footer ============ */
.site-footer { background: var(--bg-alt); border-top: 1px solid var(--border); margin-top: 80px; }
.footer-inner {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1.5fr;
  gap: 32px;
  padding: 56px 24px;
}
.footer-col h4 { margin-bottom: 16px; }
.footer-col a, .footer-col p {
  display: block;
  color: var(--text-light);
  margin-bottom: 10px;
  font-size: 0.92rem;
}
.footer-col a:hover { color: var(--primary); }
.newsletter-form { display: flex; gap: 8px; }
.newsletter-form input {
  flex: 1;
  padding: 10px 14px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
}
.footer-bottom {
  border-top: 1px solid var(--border);
  padding: 20px 0;
  text-align: center;
  color: var(--text-light);
  font-size: 0.85rem;
}

/* ============ Toast ============ */
.toast {
  position: fixed;
  bottom: 24px;
  left: 50%;
  transform: translateX(-50%) translateY(20px);
  background: var(--text-dark);
  color: #fff;
  padding: 12px 24px;
  border-radius: 30px;
  font-size: 0.9rem;
  opacity: 0;
  pointer-events: none;
  transition: all 0.25s ease;
  z-index: 1000;
}
.toast.show { opacity: 1; transform: translateX(-50%) translateY(0); }

/* ============ Page heading / Shop filter bar ============ */
.page-heading { padding: 48px 0 24px; text-align: center; }
.page-heading h1 { font-size: 2.2rem; }
.filter-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 16px;
  padding-bottom: 32px;
}
.filter-group { display: flex; gap: 12px; align-items: center; flex-wrap: wrap; }
.filter-bar select, .filter-bar input {
  padding: 10px 14px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-size: 0.9rem;
}
.result-count { color: var(--text-light); font-size: 0.9rem; }
.empty-state { grid-column: 1 / -1; text-align: center; color: var(--text-light); padding: 60px 0; }

/* ============ Product Detail ============ */
#product-detail {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 56px;
  padding: 40px 0 80px;
}
.product-detail-image { position: relative; border-radius: var(--radius); overflow: hidden; }
.product-detail-image img { width: 100%; aspect-ratio: 1; object-fit: cover; }
.product-detail-info h1 { font-size: 2rem; margin: 8px 0 12px; }
.product-description { color: var(--text-light); margin: 20px 0; line-height: 1.7; }
.qty-row { display: flex; align-items: center; gap: 12px; margin-bottom: 20px; }
.qty-row input { width: 70px; padding: 10px; border: 1px solid var(--border); border-radius: var(--radius); }
.stock-note { color: var(--success); font-size: 0.85rem; margin-top: 14px; }
.related-section { padding: 40px 0 80px; }
.breadcrumb { color: var(--text-light); font-size: 0.85rem; padding: 20px 0 0; }
.breadcrumb a:hover { color: var(--primary); }

/* ============ Cart Page ============ */
.cart-layout {
  display: grid;
  grid-template-columns: 2.5fr 1fr;
  gap: 40px;
  padding-bottom: 80px;
  align-items: start;
}
.cart-row {
  display: grid;
  grid-template-columns: 80px 1fr 100px 100px;
  gap: 20px;
  align-items: center;
  padding: 20px 0;
  border-bottom: 1px solid var(--border);
}
.cart-row img { width: 80px; height: 80px; object-fit: cover; border-radius: 8px; }
.cart-row-info h3 { font-size: 1rem; margin-bottom: 4px; }
.link-remove { color: var(--danger); font-size: 0.85rem; margin-top: 6px; text-decoration: underline; }
.qty-input { width: 60px; padding: 8px; border: 1px solid var(--border); border-radius: 8px; text-align: center; }
.cart-row-price { font-weight: 600; text-align: right; }
#cart-summary, #checkout-summary {
  background: var(--bg-alt);
  border-radius: var(--radius);
  padding: 28px;
}
#cart-summary h3 { margin-bottom: 18px; }
.summary-line { display: flex; justify-content: space-between; margin-bottom: 14px; color: var(--text-light); }
.summary-line.total {
  color: var(--text-dark);
  font-weight: 700;
  font-size: 1.1rem;
  border-top: 1px solid var(--border);
  padding-top: 14px;
  margin-top: 14px;
}
#cart-summary .btn { margin-top: 8px; }
#cart-empty, #checkout-empty { text-align: center; padding: 80px 0; color: var(--text-light); }
#cart-empty .btn, #checkout-empty .btn { margin-top: 20px; }

/* ============ Checkout ============ */
.checkout-layout {
  display: grid;
  grid-template-columns: 1.5fr 1fr;
  gap: 40px;
  padding-bottom: 80px;
  align-items: start;
}
.form-group { margin-bottom: 18px; }
.form-group label { display: block; margin-bottom: 6px; font-weight: 500; font-size: 0.9rem; }
.form-group input, .form-group select, .form-group textarea {
  width: 100%;
  padding: 12px 14px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  font-size: 0.95rem;
}
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.checkout-line { display: flex; justify-content: space-between; margin-bottom: 12px; font-size: 0.92rem; color: var(--text-light); }
.checkout-line-total {
  color: var(--text-dark);
  font-weight: 700;
  border-top: 1px solid var(--border);
  padding-top: 12px;
  margin-top: 12px;
}
#checkout-confirmation { text-align: center; padding: 60px 24px; max-width: 500px; margin: 0 auto; }
#checkout-confirmation h2 { margin-bottom: 16px; color: var(--success); }
#checkout-confirmation p { color: var(--text-light); margin-bottom: 20px; }
#checkout-confirmation .btn { margin-top: 20px; }
.demo-note {
  background: #fffbeb;
  border: 1px solid #fde68a;
  color: #92400e;
  padding: 14px 18px;
  border-radius: var(--radius);
  font-size: 0.88rem;
  text-align: left;
}

/* ============ About / Contact ============ */
.page-intro { max-width: 700px; margin: 0 auto; text-align: center; padding: 60px 24px 20px; }
.page-intro h1 { font-size: 2.4rem; margin-bottom: 16px; }
.page-intro p { color: var(--text-light); font-size: 1.05rem; }
.about-content { max-width: 800px; margin: 0 auto; padding: 20px 24px 40px; color: var(--text-light); line-height: 1.8; }
.about-content h2 { color: var(--text-dark); margin: 32px 0 12px; font-size: 1.4rem; }
.feature-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 28px; padding: 40px 0 80px; }
.feature-card { text-align: center; padding: 24px; border: 1px solid var(--border); border-radius: var(--radius); }
.feature-card h3 { margin-bottom: 8px; }
.feature-card p { color: var(--text-light); font-size: 0.92rem; }

.contact-layout { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; padding: 20px 0 80px; }
.contact-info h3 { margin-bottom: 16px; }
.contact-info p { color: var(--text-light); margin-bottom: 12px; }
#contact-confirmation {
  background: #ecfdf5;
  border: 1px solid #a7f3d0;
  color: #065f46;
  padding: 16px 20px;
  border-radius: var(--radius);
  margin-top: 16px;
}

/* ============ Responsive ============ */
@media (max-width: 992px) {
  .category-grid, .product-grid { grid-template-columns: repeat(2, 1fr); }
  #product-detail, .cart-layout, .checkout-layout, .contact-layout { grid-template-columns: 1fr; }
  .footer-inner { grid-template-columns: 1fr 1fr; }
  .hero { flex-direction: column; }
  .feature-grid { grid-template-columns: 1fr; }
}
@media (max-width: 768px) {
  .nav-links {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: #fff;
    flex-direction: column;
    padding: 20px 24px;
    border-bottom: 1px solid var(--border);
    display: none;
    gap: 16px;
  }
  .nav-links.open { display: flex; }
  .nav-toggle { display: flex; }
  .cart-row { grid-template-columns: 60px 1fr; row-gap: 8px; }
  .cart-row-price { text-align: left; }
  .form-row { grid-template-columns: 1fr; }
}
@media (max-width: 560px) {
  .category-grid, .product-grid { grid-template-columns: 1fr 1fr; }
  .hero-content h1 { font-size: 2.2rem; }
  .footer-inner { grid-template-columns: 1fr; }
}