*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }

:root {
  --bg: #ffffff;
  --surface: #f7f8fa;
  --surface-hover: #f0f1f4;
  --border: #e2e5eb;
  --border-light: #eef0f4;
  --text: #111827;
  --text-secondary: #6b7280;
  --text-muted: #9ca3af;
  --accent: #2563eb;
  --accent-hover: #1d4ed8;
  --accent-light: #eff6ff;
  --accent-subtle: #dbeafe;
  --success: #059669;
  --success-light: #ecfdf5;
  --danger: #dc2626;
  --danger-light: #fef2f2;
  --warning: #d97706;
  --warning-light: #fffbeb;
  --shadow-sm: 0 1px 2px rgba(0,0,0,0.05);
  --shadow-md: 0 4px 12px rgba(0,0,0,0.08);
  --shadow-lg: 0 8px 30px rgba(0,0,0,0.1);
  --radius: 12px;
  --radius-sm: 8px;
  --radius-xs: 6px;
}

html { scroll-behavior: smooth; }

body {
  font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}

a { color: inherit; text-decoration: none; }
button { font-family: inherit; cursor: pointer; border: none; background: none; }
img { display: block; max-width: 100%; }
input, textarea, select {
  font-family: inherit;
  font-size: 15px;
  background: var(--bg);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 12px 16px;
  outline: none;
  width: 100%;
  transition: border-color 0.2s, box-shadow 0.2s;
}
input:focus, textarea:focus, select:focus {
  border-color: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-subtle);
}
input::placeholder, textarea::placeholder { color: var(--text-muted); }

/* ─── Nav ─── */
.nav {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 40px;
  height: 64px;
  background: rgba(255,255,255,0.85);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-light);
  transition: box-shadow 0.3s;
}
.nav.scrolled {
  box-shadow: var(--shadow-sm);
}
.nav-logo {
  font-size: 18px;
  font-weight: 800;
  letter-spacing: 2px;
  color: var(--accent);
}
.nav-links { display: flex; gap: 32px; }
.nav-links a {
  font-size: 14px;
  font-weight: 500;
  color: var(--text-secondary);
  transition: color 0.2s;
  position: relative;
}
.nav-links a:hover { color: var(--text); }
.nav-links a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--accent);
  transition: width 0.2s;
}
.nav-links a:hover::after { width: 100%; }
.nav-right { display: flex; align-items: center; gap: 16px; }
.nav-cart {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  transition: all 0.2s;
}
.nav-cart:hover { color: var(--accent); background: var(--accent-light); }
.cart-badge {
  position: absolute;
  top: 2px;
  right: 2px;
  background: var(--accent);
  color: #fff;
  font-size: 10px;
  font-weight: 700;
  width: 18px;
  height: 18px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
}
.cart-badge:empty { display: none; }

/* ─── Hero sections ─── */
.hero-section {
  position: relative;
  width: 100%;
  height: 100vh;
  min-height: 600px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  overflow: hidden;
}
.hero-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}
.hero-bg img, .hero-bg video {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(to bottom, rgba(0,0,0,0.2) 0%, rgba(0,0,0,0.05) 40%, rgba(0,0,0,0.4) 100%);
  z-index: 1;
}
.hero-content {
  position: relative;
  z-index: 2;
  max-width: 800px;
  padding: 0 24px;
}
.hero-title {
  font-size: clamp(40px, 8vw, 88px);
  font-weight: 800;
  letter-spacing: -1px;
  line-height: 1.05;
  margin-bottom: 20px;
}
.hero-subtitle {
  font-size: clamp(15px, 2vw, 19px);
  color: rgba(255,255,255,0.75);
  font-weight: 400;
  margin-bottom: 40px;
  line-height: 1.6;
}
.hero-actions { display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; }
.hero-bottom {
  position: absolute;
  bottom: 32px;
  left: 50%;
  transform: translateX(-50%);
  z-index: 2;
}
.scroll-arrow {
  width: 24px;
  height: 24px;
  border-left: 2px solid rgba(255,255,255,0.5);
  border-bottom: 2px solid rgba(255,255,255,0.5);
  transform: rotate(-45deg);
  animation: bounceArrow 2s infinite;
}
@keyframes bounceArrow {
  0%, 100% { transform: rotate(-45deg) translate(0, 0); opacity: 0.5; }
  50% { transform: rotate(-45deg) translate(5px, 5px); opacity: 1; }
}

/* ─── Buttons ─── */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 12px 32px;
  font-size: 14px;
  font-weight: 600;
  border-radius: var(--radius-sm);
  transition: all 0.2s;
  min-width: 140px;
  gap: 8px;
}
.btn-primary {
  background: var(--accent);
  color: #fff;
  box-shadow: 0 1px 3px rgba(37,99,235,0.3);
}
.btn-primary:hover { background: var(--accent-hover); box-shadow: 0 4px 12px rgba(37,99,235,0.3); transform: translateY(-1px); }
.btn-secondary {
  background: rgba(255,255,255,0.15);
  color: #fff;
  backdrop-filter: blur(10px);
  border: 1px solid rgba(255,255,255,0.25);
}
.btn-secondary:hover { background: rgba(255,255,255,0.25); }
.btn-accent {
  background: var(--accent);
  color: #fff;
}
.btn-accent:hover { background: var(--accent-hover); }
.btn-ghost {
  background: transparent;
  color: var(--text);
  border: 1px solid var(--border);
}
.btn-ghost:hover { border-color: var(--accent); color: var(--accent); }
.btn-outline-accent {
  background: transparent;
  color: var(--accent);
  border: 1.5px solid var(--accent);
}
.btn-outline-accent:hover { background: var(--accent-light); }
.btn-white {
  background: #fff;
  color: var(--text);
  box-shadow: var(--shadow-sm);
}
.btn-white:hover { box-shadow: var(--shadow-md); transform: translateY(-1px); }

/* ─── Sections ─── */
.section {
  padding: 100px 40px;
  max-width: 1200px;
  margin: 0 auto;
}
.section-label {
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 1px;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 12px;
}
.section-title {
  font-size: clamp(28px, 4vw, 44px);
  font-weight: 800;
  margin-bottom: 12px;
  letter-spacing: -0.5px;
  color: var(--text);
}
.section-desc {
  font-size: 16px;
  color: var(--text-secondary);
  max-width: 600px;
  line-height: 1.8;
}

/* ─── Product grid ─── */
.products-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 24px;
}
.product-card {
  background: var(--bg);
  border: 1px solid var(--border-light);
  border-radius: var(--radius);
  padding: 24px;
  display: flex;
  flex-direction: column;
  transition: all 0.3s;
  cursor: pointer;
}
.product-card:hover {
  border-color: var(--accent-subtle);
  box-shadow: var(--shadow-md);
  transform: translateY(-4px);
}
.product-card-img {
  width: 100%;
  aspect-ratio: 1;
  background: var(--surface);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 20px;
  overflow: hidden;
}
.product-card-img img { width: 75%; height: 75%; object-fit: contain; }
.product-card h3 {
  font-size: 16px;
  font-weight: 600;
  margin-bottom: 4px;
  color: var(--text);
}
.product-card .volume {
  font-size: 13px;
  color: var(--text-muted);
  margin-bottom: 12px;
}
.product-card .price {
  font-size: 20px;
  font-weight: 700;
  color: var(--accent);
  margin-top: auto;
}
.product-card .price span {
  font-size: 13px;
  font-weight: 400;
  color: var(--text-secondary);
}

/* ─── Features ─── */
.features-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
  max-width: 1200px;
  margin: 0 auto;
  padding: 80px 40px;
}
.feature-item {
  background: var(--bg);
  border: 1px solid var(--border-light);
  border-radius: var(--radius);
  padding: 40px 32px;
  text-align: center;
  transition: all 0.3s;
}
.feature-item:hover { box-shadow: var(--shadow-md); transform: translateY(-2px); }
.feature-icon {
  width: 56px;
  height: 56px;
  margin: 0 auto 20px;
  background: var(--accent-light);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 14px;
  color: var(--accent);
}
.feature-title {
  font-size: 16px;
  font-weight: 700;
  margin-bottom: 8px;
  letter-spacing: 0.5px;
  color: var(--text);
}
.feature-desc {
  font-size: 14px;
  color: var(--text-secondary);
  line-height: 1.7;
}

/* ─── Cart ─── */
.cart-item {
  display: flex;
  align-items: center;
  gap: 20px;
  padding: 20px 0;
  border-bottom: 1px solid var(--border-light);
}
.cart-item-img {
  width: 80px;
  height: 80px;
  background: var(--surface);
  border-radius: var(--radius-sm);
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
}
.cart-item-img img { width: 60px; height: 60px; object-fit: contain; }
.cart-item-info { flex: 1; }
.cart-item-name { font-size: 15px; font-weight: 600; color: var(--text); }
.cart-item-volume { font-size: 13px; color: var(--text-muted); }
.cart-item-price { font-size: 16px; font-weight: 700; white-space: nowrap; color: var(--text); }
.qty-control {
  display: flex;
  align-items: center;
  gap: 8px;
}
.qty-btn {
  width: 36px;
  height: 36px;
  border: 1px solid var(--border);
  border-radius: var(--radius-xs);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
  color: var(--text);
  transition: all 0.2s;
}
.qty-btn:hover { border-color: var(--accent); color: var(--accent); background: var(--accent-light); }
.qty-num { font-size: 15px; font-weight: 600; min-width: 24px; text-align: center; }

/* ─── Footer ─── */
.footer {
  background: #111827;
  color: #fff;
  padding: 64px 40px 40px;
}
.footer-inner {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  gap: 40px;
  flex-wrap: wrap;
}
.footer-col h4 {
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: rgba(255,255,255,0.4);
  margin-bottom: 16px;
}
.footer-col a, .footer-col p {
  display: block;
  font-size: 14px;
  color: rgba(255,255,255,0.65);
  margin-bottom: 8px;
  transition: color 0.2s;
}
.footer-col a:hover { color: #fff; }
.footer-bottom {
  max-width: 1200px;
  margin: 40px auto 0;
  padding-top: 24px;
  border-top: 1px solid rgba(255,255,255,0.1);
  font-size: 12px;
  color: rgba(255,255,255,0.3);
}

/* ─── Fade in ─── */
.fade-in {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 0.7s ease-out, transform 0.7s ease-out;
}
.fade-in.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ─── Category tabs ─── */
.category-tabs {
  display: flex;
  gap: 8px;
  margin-bottom: 40px;
  overflow-x: auto;
  scrollbar-width: none;
  padding-bottom: 4px;
}
.category-tab {
  padding: 10px 24px;
  font-size: 13px;
  font-weight: 600;
  color: var(--text-secondary);
  background: var(--surface);
  border: 1px solid var(--border-light);
  border-radius: 100px;
  white-space: nowrap;
  transition: all 0.2s;
}
.category-tab.active {
  background: var(--accent);
  color: #fff;
  border-color: var(--accent);
}
.category-tab:hover:not(.active) { border-color: var(--accent); color: var(--accent); }

/* ─── Order status ─── */
.status-badge {
  display: inline-block;
  padding: 4px 12px;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.5px;
  text-transform: uppercase;
  border-radius: 100px;
}
.status-pending { background: var(--warning-light); color: var(--warning); }
.status-confirmed { background: var(--accent-light); color: var(--accent); }
.status-processing { background: #f3e8ff; color: #7c3aed; }
.status-delivering { background: var(--success-light); color: var(--success); }
.status-delivered { background: var(--success-light); color: var(--success); }
.status-cancelled { background: var(--danger-light); color: var(--danger); }

/* ─── Product detail ─── */
.product-detail {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 60px;
  align-items: start;
}
.product-detail-gallery {
  position: sticky;
  top: 88px;
}
.product-detail-img {
  width: 100%;
  aspect-ratio: 1;
  background: var(--surface);
  border-radius: var(--radius);
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}
.product-detail-img img { width: 80%; height: 80%; object-fit: contain; }
.product-detail-thumbs {
  display: flex;
  gap: 8px;
  margin-top: 12px;
}
.product-detail-thumb {
  width: 64px;
  height: 64px;
  background: var(--surface);
  border-radius: var(--radius-xs);
  border: 2px solid transparent;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  transition: border-color 0.2s;
}
.product-detail-thumb.active, .product-detail-thumb:hover { border-color: var(--accent); }
.product-detail-thumb img { width: 80%; height: 80%; object-fit: contain; }
.product-detail-info { padding-top: 8px; }
.product-badge {
  display: inline-block;
  padding: 4px 12px;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.5px;
  text-transform: uppercase;
  border-radius: 100px;
  background: var(--accent-light);
  color: var(--accent);
  margin-bottom: 16px;
}
.product-detail-name {
  font-size: clamp(24px, 3vw, 36px);
  font-weight: 800;
  letter-spacing: -0.5px;
  margin-bottom: 12px;
  color: var(--text);
}
.product-detail-desc {
  font-size: 15px;
  color: var(--text-secondary);
  line-height: 1.8;
  margin-bottom: 24px;
}
.product-detail-volume {
  font-size: 14px;
  color: var(--text-muted);
  margin-bottom: 8px;
}
.product-detail-price {
  font-size: 32px;
  font-weight: 800;
  color: var(--accent);
  margin-bottom: 32px;
}
.product-detail-actions {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 24px;
}
.product-detail-stock {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 13px;
  font-weight: 600;
}
.stock-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--success);
}
.stock-dot.out { background: var(--danger); }
.product-detail-meta {
  margin-top: 32px;
  padding-top: 24px;
  border-top: 1px solid var(--border-light);
}
.product-meta-row {
  display: flex;
  justify-content: space-between;
  padding: 8px 0;
  font-size: 14px;
}
.product-meta-row span:first-child { color: var(--text-muted); }
.product-meta-row span:last-child { font-weight: 600; }

/* ─── Trust badges ─── */
.trust-badges {
  display: flex;
  gap: 24px;
  margin-top: 32px;
  padding-top: 24px;
  border-top: 1px solid var(--border-light);
}
.trust-badge-item {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 12px;
  color: var(--text-muted);
}
.trust-badge-icon {
  width: 20px;
  height: 20px;
  color: var(--success);
}

/* ─── Forms ─── */
.form-group { margin-bottom: 20px; }
.form-label {
  display: block;
  font-size: 13px;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 6px;
}

/* ─── Cart summary ─── */
.cart-summary {
  margin-top: 40px;
  padding: 32px;
  background: var(--surface);
  border-radius: var(--radius);
  max-width: 400px;
  margin-left: auto;
}
.cart-summary-row {
  display: flex;
  justify-content: space-between;
  font-size: 14px;
  color: var(--text-secondary);
  margin-bottom: 8px;
}
.cart-summary-total {
  font-size: 18px;
  font-weight: 700;
  color: var(--text);
  margin-top: 16px;
  padding-top: 16px;
  border-top: 1px solid var(--border);
}

/* ─── Checkout summary ─── */
.checkout-summary {
  background: var(--surface);
  border-radius: var(--radius-sm);
  padding: 24px;
  margin-bottom: 24px;
}

/* ─── Announcement bar ─── */
.announcement-bar {
  background: var(--accent);
  color: #fff;
  text-align: center;
  padding: 10px 20px;
  font-size: 13px;
  font-weight: 500;
}

/* ─── Responsive ─── */
@media (max-width: 768px) {
  .nav { padding: 0 20px; }
  .nav-links { display: none; }
  .section { padding: 64px 20px; }
  .features-grid { grid-template-columns: 1fr; padding: 48px 20px; }
  .products-grid { grid-template-columns: repeat(2, 1fr); gap: 12px; }
  .product-card { padding: 16px; }
  .footer { padding: 48px 20px 32px; }
  .footer-inner { flex-direction: column; }
  .hero-title { letter-spacing: 0; }
  .btn { padding: 12px 24px; min-width: 120px; font-size: 13px; }
  .product-detail { grid-template-columns: 1fr; gap: 32px; }
  .product-detail-gallery { position: static; }
  .cart-summary { max-width: 100%; }
  .trust-badges { flex-direction: column; gap: 12px; }
}

@media (max-width: 480px) {
  .products-grid { grid-template-columns: 1fr; }
}