:root {
  --bg: #f7f9fb;
  --surface: #ffffff;
  --text: #111827;
  --text-light: #4b5563;
  --muted: #6b7280;
  --border: #e5e7eb;
  --accent: #2563eb;
  --accent-dark: #1d4ed8;
  --accent2: #10b981;
  --danger: #ef4444;
  --warn: #f59e0b;
  --shadow-sm: 0 1px 3px rgba(0,0,0,0.07);
  --shadow: 0 4px 12px rgba(0,0,0,0.08);
  --shadow-lg: 0 12px 28px rgba(0,0,0,0.12);
  --radius: 12px;
  --radius-sm: 8px;
  --max-width: 1280px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
}

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

a { color: inherit; text-decoration: none; }

button, input, select, textarea { font: inherit; }

.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.25rem;
}

/* Header */
.site-header {
  background: var(--surface);
  border-bottom: 1px solid var(--border);
  position: sticky;
  top: 0;
  z-index: 100;
}

.header-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding-top: 0.75rem;
  padding-bottom: 0.75rem;
}

.logo {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--accent);
  letter-spacing: -0.02em;
}

.search-form {
  flex: 1;
  max-width: 620px;
  display: flex;
}

.search-form input {
  flex: 1;
  border: 1px solid var(--border);
  border-right: none;
  border-radius: var(--radius-sm) 0 0 var(--radius-sm);
  padding: 0.55rem 0.9rem;
  outline: none;
}

.search-form input:focus { border-color: var(--accent); }

.search-form button {
  background: var(--accent);
  color: #fff;
  border: none;
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  padding: 0 1rem;
  cursor: pointer;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: 1.25rem;
}

.icon-link {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.9rem;
  color: var(--text-light);
  position: relative;
}

.icon-link:hover { color: var(--accent); }

.icon-link .label { display: inline; }

.badge-count {
  background: var(--accent);
  color: #fff;
  font-size: 0.7rem;
  font-weight: 700;
  min-width: 1.25rem;
  height: 1.25rem;
  border-radius: 999px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.header-bottom {
  border-top: 1px solid var(--border);
  display: flex;
  align-items: center;
  gap: 1rem;
  padding-top: 0.5rem;
  padding-bottom: 0.5rem;
}

.category-nav {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  gap: 1.5rem;
  overflow-x: auto;
}

.category-nav a {
  font-size: 0.9rem;
  color: var(--text-light);
  white-space: nowrap;
  padding: 0.25rem 0;
  border-bottom: 2px solid transparent;
}

.category-nav a:hover,
.category-nav a.active {
  color: var(--accent);
  border-bottom-color: var(--accent);
}

.mobile-menu-toggle,
.nav-toggle {
  display: none;
  background: none;
  border: none;
  font-size: 1.35rem;
  cursor: pointer;
}

/* Hero */
.hero {
  background: linear-gradient(135deg, #1e3a8a 0%, #2563eb 100%);
  color: #fff;
  padding: 5rem 0 6rem;
  margin-bottom: 2rem;
}

.hero-content {
  max-width: 640px;
}

.hero h1 {
  font-size: clamp(2rem, 5vw, 3.5rem);
  margin: 0 0 1rem;
  line-height: 1.15;
}

.hero p {
  font-size: 1.15rem;
  margin: 0 0 1.75rem;
  opacity: 0.92;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  background: var(--accent);
  color: #fff;
  border: none;
  padding: 0.65rem 1.25rem;
  border-radius: var(--radius-sm);
  font-weight: 600;
  cursor: pointer;
  transition: background 0.2s, transform 0.15s, box-shadow 0.2s;
}

.btn:hover {
  background: var(--accent-dark);
  transform: translateY(-1px);
}

.btn-secondary {
  background: #fff;
  color: var(--text);
  border: 1px solid var(--border);
}

.btn-secondary:hover { background: var(--bg); }

.btn-lg { padding: 0.85rem 1.75rem; font-size: 1.05rem; }
.btn-block { width: 100%; }

.text-btn {
  background: none;
  border: none;
  color: var(--accent);
  font-size: 0.85rem;
  cursor: pointer;
  padding: 0.25rem 0;
}

.text-btn:hover { text-decoration: underline; }

.link {
  color: var(--accent);
  font-weight: 600;
  font-size: 0.95rem;
}

/* Sections */
.section { margin: 3rem 0; }

.section-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1.25rem;
}

.section-title {
  font-size: 1.5rem;
  margin: 0;
}

/* Category cards */
.category-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(160px, 1fr));
  gap: 1rem;
}

.category-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  text-align: center;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
  transition: box-shadow 0.2s, transform 0.15s;
}

.category-card:hover {
  box-shadow: var(--shadow);
  transform: translateY(-3px);
}

.category-icon { font-size: 2rem; }
.category-name { font-weight: 600; color: var(--text-light); }

/* Product cards */
.product-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 1.5rem;
}

.product-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  transition: box-shadow 0.2s, transform 0.15s;
}

.product-card:hover {
  box-shadow: var(--shadow);
  transform: translateY(-3px);
}

.product-image {
  position: relative;
  aspect-ratio: 4 / 3;
  background: #f3f4f6;
}

.product-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.badge {
  position: absolute;
  top: 0.75rem;
  left: 0.75rem;
  font-size: 0.7rem;
  font-weight: 700;
  padding: 0.25rem 0.5rem;
  border-radius: 999px;
  text-transform: uppercase;
}

.badge-primary { background: var(--accent); color: #fff; }
.badge-sale { background: var(--accent2); color: #fff; left: auto; right: 0.75rem; }

.wishlist-btn {
  position: absolute;
  top: 0.75rem;
  right: 0.75rem;
  background: #fff;
  border: 1px solid var(--border);
  border-radius: 50%;
  width: 2rem;
  height: 2rem;
  display: grid;
  place-items: center;
  cursor: pointer;
  color: var(--muted);
  transition: color 0.2s, border-color 0.2s;
}

.wishlist-btn.active,
.wishlist-btn:hover { color: var(--danger); border-color: var(--danger); }

.product-info {
  padding: 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  flex: 1;
}

.product-category {
  font-size: 0.75rem;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.03em;
  margin: 0;
}

.product-name {
  font-size: 1rem;
  margin: 0;
  line-height: 1.35;
}

.product-name a:hover { color: var(--accent); }

.product-rating {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.85rem;
  color: var(--text-light);
}

.stars { color: var(--warn); letter-spacing: 0.05em; }
.review-count { color: var(--muted); }

.product-desc {
  font-size: 0.85rem;
  color: var(--text-light);
  margin: 0;
  line-height: 1.45;
}

.product-price-row {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  margin-top: auto;
  padding-top: 0.5rem;
}

.price {
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--text);
}

.price-large { font-size: 1.6rem; }

.original-price {
  text-decoration: line-through;
  color: var(--muted);
  font-size: 0.9rem;
}

.savings {
  color: var(--accent2);
  font-weight: 600;
  font-size: 0.85rem;
}

.add-to-cart { margin-top: 0.75rem; }

/* Shop layout */
.shop-layout {
  display: grid;
  grid-template-columns: 260px 1fr;
  gap: 2rem;
  padding-top: 2rem;
  padding-bottom: 2rem;
}

.filters {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem;
  height: fit-content;
  position: sticky;
  top: 7rem;
}

.filter-group {
  margin-bottom: 1.25rem;
}

.filter-group label {
  display: block;
  font-weight: 600;
  margin-bottom: 0.4rem;
  font-size: 0.9rem;
}

.filter-group select,
.filter-group input[type="number"] {
  width: 100%;
  padding: 0.5rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
}

.range-row {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.range-row input { flex: 1; }

.rating-filters { display: flex; gap: 0.5rem; }
.rating-filters button {
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 0.35rem 0.6rem;
  cursor: pointer;
  font-size: 0.85rem;
}
.rating-filters button.active { background: var(--accent); color: #fff; border-color: var(--accent); }

.shop-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 1rem;
}

.sort-row {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.9rem;
}

.sort-row select { padding: 0.4rem 0.6rem; }

.empty {
  color: var(--muted);
  padding: 2rem 0;
}

/* Product detail */
.product-detail-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 3rem;
  padding: 2rem 0;
}

.product-detail-media {
  background: #fff;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}

.product-detail-media img {
  width: 100%;
  height: auto;
}

.product-detail-info h1 {
  font-size: 2rem;
  margin: 0 0 0.75rem;
}

.specs {
  list-style: none;
  padding: 0;
  margin: 1.25rem 0;
}

.specs li {
  padding: 0.35rem 0;
  border-bottom: 1px solid var(--border);
  color: var(--text-light);
  font-size: 0.95rem;
}

.qty-row {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin: 1.5rem 0;
}

.qty-row input {
  width: 4rem;
  padding: 0.55rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  text-align: center;
}

.wishlist-lg {
  width: 2.75rem;
  height: 2.75rem;
  border-radius: 50%;
  border: 1px solid var(--border);
  background: #fff;
  cursor: pointer;
  font-size: 1.25rem;
  color: var(--muted);
  transition: color 0.2s, border-color 0.2s;
}

.wishlist-lg.active,
.wishlist-lg:hover { color: var(--danger); border-color: var(--danger); }

.trust-badges {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  font-size: 0.85rem;
  color: var(--text-light);
}

/* Cart */
.cart-layout,
.checkout-layout,
.account-layout {
  display: grid;
  grid-template-columns: 1fr 340px;
  gap: 2rem;
  padding: 2rem 0;
}

.cart-items-section h1,
.checkout-form h1,
#tab-login h2,
#tab-profile h2,
#tab-orders h2,
#tab-addresses h2,
#page-wishlist h1,
#page-search h1 {
  margin-top: 0;
  font-size: 1.75rem;
}

.cart-item {
  display: grid;
  grid-template-columns: 100px 1fr auto;
  gap: 1rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1rem;
  margin-bottom: 1rem;
  align-items: center;
}

.cart-thumb {
  width: 100px;
  height: 80px;
  object-fit: cover;
  border-radius: var(--radius-sm);
  background: #f3f4f6;
}

.cart-item-info h3 {
  margin: 0 0 0.25rem;
  font-size: 1rem;
}

.cart-item-info .meta {
  color: var(--muted);
  font-size: 0.85rem;
  margin: 0 0 0.5rem;
}

.cart-actions {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.qty-control {
  display: flex;
  align-items: center;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  overflow: hidden;
}

.qty-control button {
  background: var(--bg);
  border: none;
  width: 2rem;
  height: 2rem;
  cursor: pointer;
  font-weight: 700;
}

.qty-control span {
  padding: 0 0.75rem;
  min-width: 2rem;
  text-align: center;
  font-size: 0.9rem;
}

.cart-item-total {
  font-weight: 700;
  font-size: 1.1rem;
  text-align: right;
}

.cart-summary,
.checkout-summary {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
  height: fit-content;
  position: sticky;
  top: 7rem;
}

.cart-summary h3,
.checkout-summary h3 { margin-top: 0; }

.summary-line {
  display: flex;
  justify-content: space-between;
  margin: 0.6rem 0;
  color: var(--text-light);
}

.summary-line.total {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text);
  padding-top: 0.75rem;
  border-top: 1px solid var(--border);
}

.empty-state {
  text-align: center;
  padding: 3rem 1rem;
  color: var(--muted);
}

.saved-items h2 {
  font-size: 1.25rem;
  margin: 2rem 0 1rem;
}

.saved-item { grid-template-columns: 80px 1fr auto; }
.saved-item .cart-thumb { width: 80px; height: 65px; }

.secure-note {
  font-size: 0.8rem;
  color: var(--muted);
  text-align: center;
  margin-top: 0.75rem;
}

/* Checkout */
.checkout-form form {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
}

.form-section {
  margin-bottom: 1.5rem;
}

.form-section h2 {
  font-size: 1.1rem;
  margin: 0 0 0.75rem;
}

.form-section input[type="text"],
.form-section input[type="email"] {
  width: 100%;
  padding: 0.65rem;
  margin-bottom: 0.75rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
}

.form-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.75rem;
}

.radio-label {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 0.5rem;
  cursor: pointer;
}

.checkout-item {
  display: flex;
  justify-content: space-between;
  font-size: 0.9rem;
  color: var(--text-light);
  padding: 0.35rem 0;
  border-bottom: 1px solid var(--border);
}

/* Account */
.account-nav {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem;
  height: fit-content;
}

.account-nav h3 { margin-top: 0; font-size: 1.1rem; }

.tab-btn {
  display: block;
  width: 100%;
  text-align: left;
  background: none;
  border: none;
  padding: 0.65rem 0.75rem;
  border-radius: var(--radius-sm);
  cursor: pointer;
  color: var(--text-light);
  margin-bottom: 0.35rem;
}

.tab-btn:hover,
.tab-btn.active {
  background: var(--bg);
  color: var(--accent);
  font-weight: 600;
}

.account-content {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem;
}

#login-form input,
#login-form button {
  width: 100%;
  margin-bottom: 0.75rem;
}

.order-card {
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 1rem;
  margin-bottom: 1rem;
}

.order-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: 0.75rem;
}

.order-id { font-weight: 700; margin: 0; }
.order-date { color: var(--muted); font-size: 0.85rem; margin: 0.15rem 0 0; }
.order-status {
  background: var(--bg);
  color: var(--accent);
  font-size: 0.75rem;
  font-weight: 700;
  padding: 0.25rem 0.6rem;
  border-radius: 999px;
}

.order-items p { margin: 0.25rem 0; font-size: 0.9rem; color: var(--text-light); }
.order-total { margin: 0.75rem 0 0; }

.address-card {
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 1rem;
  margin-bottom: 0.75rem;
}
.address-card p { margin: 0.25rem 0; }

/* Footer */
.site-footer {
  background: var(--surface);
  border-top: 1px solid var(--border);
  padding: 3rem 0 1.5rem;
  margin-top: 3rem;
}

.footer-grid {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 2rem;
  margin-bottom: 2rem;
}

.footer-grid h4 { margin: 0 0 0.75rem; }
.footer-grid ul { list-style: none; padding: 0; margin: 0; }
.footer-grid li { margin: 0.4rem 0; }
.footer-grid a { color: var(--text-light); }
.footer-grid a:hover { color: var(--accent); }

.footer-bottom { text-align: center; color: var(--muted); font-size: 0.85rem; }

/* Toast */
.toast-container {
  position: fixed;
  bottom: 1.5rem;
  right: 1.5rem;
  z-index: 200;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.toast {
  background: var(--surface);
  color: var(--text);
  border-left: 4px solid var(--accent2);
  padding: 0.85rem 1.25rem;
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-lg);
  opacity: 0;
  transform: translateY(10px);
  transition: opacity 0.3s, transform 0.3s;
  min-width: 220px;
}

.toast.show { opacity: 1; transform: translateY(0); }
.toast-error { border-left-color: var(--danger); }

@media (max-width: 900px) {
  .shop-layout,
  .cart-layout,
  .checkout-layout,
  .account-layout,
  .product-detail-layout {
    grid-template-columns: 1fr;
  }

  .filters {
    position: static;
    margin-bottom: 1rem;
  }

  .cart-summary,
  .checkout-summary {
    position: static;
  }
}

@media (max-width: 640px) {
  .header-top {
    flex-wrap: wrap;
    gap: 0.75rem;
  }

  .search-form {
    order: 3;
    max-width: 100%;
    width: 100%;
  }

  .icon-link .label { display: none; }

  .category-nav {
    display: none;
    flex-direction: column;
    gap: 0;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    background: var(--surface);
    border-bottom: 1px solid var(--border);
    padding: 0.5rem 1.25rem;
  }

  .category-nav.open { display: flex; }
  .category-nav li { border-bottom: 1px solid var(--border); }
  .category-nav a { display: block; padding: 0.65rem 0; }

  .mobile-menu-toggle,
  .nav-toggle {
    display: inline-flex;
  }

  .header-bottom .category-nav ~ .nav-toggle { display: none; }

  .hero { padding: 3rem 0 4rem; }

  .product-grid { grid-template-columns: repeat(auto-fill, minmax(200px, 1fr)); }

  .cart-item {
    grid-template-columns: 80px 1fr;
    align-items: start;
  }

  .cart-item-total {
    grid-column: 1 / -1;
    text-align: left;
  }

  .cart-actions { flex-wrap: wrap; }
}