/* ===== Reset & Variables ===== */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }

:root {
  --primary: #e63946;
  --primary-dark: #c1121f;
  --dark: #1a1a2e;
  --dark-soft: #16213e;
  --accent: #ff6b6b;
  --text: #333;
  --text-light: #666;
  --bg: #fafafa;
  --white: #fff;
  --gray-100: #f8f9fa;
  --gray-200: #e9ecef;
  --gray-300: #dee2e6;
  --shadow: 0 2px 15px rgba(0,0,0,0.08);
  --shadow-lg: 0 8px 30px rgba(0,0,0,0.12);
  --radius: 12px;
  --radius-sm: 8px;
  --transition: all 0.3s ease;
}

html { scroll-behavior: smooth; }
body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.6;
}
a { text-decoration: none; color: inherit; }
img { max-width: 100%; display: block; }
ul { list-style: none; }
input, select, textarea { outline: none; font-family: inherit; }

/* ===== Header ===== */
header {
  background: var(--white);
  box-shadow: var(--shadow);
  position: sticky;
  top: 0;
  z-index: 1000;
}
.header-inner {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 70px;
}
.logo {
  font-size: 1.5rem;
  font-weight: 800;
  color: var(--primary);
  letter-spacing: 1px;
}
.logo span { color: var(--dark); }

nav ul { display: flex; gap: 30px; }
nav ul li a {
  font-size: 0.95rem;
  color: var(--text);
  font-weight: 500;
  transition: var(--transition);
  position: relative;
}
nav ul li a::after {
  content: '';
  position: absolute;
  left: 0;
  bottom: -4px;
  width: 0;
  height: 2px;
  background: var(--primary);
  transition: var(--transition);
}
nav ul li a:hover { color: var(--primary); }
nav ul li a:hover::after { width: 100%; }

.header-actions { display: flex; align-items: center; gap: 20px; }
.cart-icon {
  position: relative;
  font-size: 1.3rem;
  cursor: pointer;
  background: none;
  border: none;
  color: var(--dark);
  transition: var(--transition);
}
.cart-icon:hover { color: var(--primary); }
.cart-count {
  position: absolute;
  top: -8px;
  right: -10px;
  background: var(--primary);
  color: white;
  font-size: 0.7rem;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 600;
}
/* ===== Hero ===== */
.hero {
  background: linear-gradient(135deg, var(--dark) 0%, var(--dark-soft) 50%, var(--primary-dark) 100%);
  color: var(--white);
  padding: 100px 20px;
  text-align: center;
  position: relative;
  overflow: hidden;
}
.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle, rgba(230,57,70,0.15) 0%, transparent 60%);
  animation: pulse 8s ease-in-out infinite;
}
@keyframes pulse {
  0%, 100% { transform: scale(1); opacity: 0.5; }
  50% { transform: scale(1.2); opacity: 1; }
}
.hero-content { position: relative; z-index: 1; max-width: 700px; margin: 0 auto; }
.hero h1 { font-size: 3rem; font-weight: 800; margin-bottom: 20px; line-height: 1.2; }
.hero h1 span { color: var(--accent); }
.hero p { font-size: 1.15rem; opacity: 0.9; margin-bottom: 35px; line-height: 1.8; }
.hero-badge {
  display: inline-block;
  background: rgba(255,255,255,0.1);
  border: 1px solid rgba(255,255,255,0.2);
  padding: 6px 18px;
  border-radius: 50px;
  font-size: 0.85rem;
  margin-bottom: 25px;
  backdrop-filter: blur(4px);
}
.btn {
  display: inline-block;
  padding: 14px 36px;
  border-radius: 50px;
  font-weight: 600;
  font-size: 1rem;
  cursor: pointer;
  border: none;
  transition: var(--transition);
}
.btn-primary { background: var(--primary); color: var(--white); }
.btn-primary:hover { background: var(--primary-dark); transform: translateY(-2px); box-shadow: 0 6px 20px rgba(230,57,70,0.4); }
.btn-outline {
  background: transparent;
  color: var(--white);
  border: 2px solid rgba(255,255,255,0.3);
  margin-left: 12px;
}
.btn-outline:hover { border-color: var(--white); transform: translateY(-2px); }
.btn-dark { background: var(--dark); color: white; }
.btn-dark:hover { background: #2a2a4a; transform: translateY(-2px); }
.btn-sm { padding: 10px 24px; font-size: 0.9rem; }

/* ===== Sections ===== */
.section { padding: 80px 20px; }
.section-inner { max-width: 1200px; margin: 0 auto; }
.section-title {
  text-align: center;
  font-size: 2rem;
  font-weight: 700;
  margin-bottom: 12px;
  color: var(--dark);
}
.section-subtitle {
  text-align: center;
  color: var(--text-light);
  margin-bottom: 50px;
  font-size: 1.05rem;
}

/* ===== Categories ===== */
.categories { display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 20px; }
.category-card {
  background: var(--white);
  border-radius: var(--radius);
  padding: 35px 20px;
  text-align: center;
  box-shadow: var(--shadow);
  cursor: pointer;
  transition: var(--transition);
  border: 2px solid transparent;
}
.category-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-lg);
  border-color: var(--primary);
}
.category-icon { font-size: 2.5rem; margin-bottom: 12px; }
.category-card h3 { font-size: 1.05rem; font-weight: 600; color: var(--dark); }
.category-card p { font-size: 0.85rem; color: var(--text-light); margin-top: 5px; }

/* ===== Products Grid ===== */
.products-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
  gap: 25px;
}
.product-card {
  background: var(--white);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
  transition: var(--transition);
  cursor: pointer;
  position: relative;
}
.product-card:hover { transform: translateY(-5px); box-shadow: var(--shadow-lg); }
.product-badge {
  position: absolute;
  top: 12px;
  left: 12px;
  background: var(--primary);
  color: white;
  padding: 4px 12px;
  border-radius: 50px;
  font-size: 0.75rem;
  font-weight: 600;
  z-index: 1;
}
.product-badge.sale { background: #ff6b35; }
.product-badge.new { background: #06d6a0; }
.product-image {
  height: 240px;
  background: var(--gray-100);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 3.5rem;
  position: relative;
}
.product-info { padding: 18px; }
.product-category { font-size: 0.75rem; color: var(--primary); font-weight: 600; text-transform: uppercase; letter-spacing: 1px; }
.product-name { font-size: 1rem; font-weight: 600; margin: 6px 0 8px; color: var(--dark); }
.product-rating { color: #ffc107; font-size: 0.85rem; margin-bottom: 8px; }
.product-price { display: flex; align-items: center; gap: 10px; }
.price-current { font-size: 1.2rem; font-weight: 700; color: var(--primary); }
.price-original { font-size: 0.9rem; color: var(--text-light); text-decoration: line-through; }
.add-to-cart {
  width: 100%;
  padding: 10px;
  background: var(--dark);
  color: white;
  border: none;
  border-radius: 0 0 var(--radius) var(--radius);
  font-weight: 600;
  cursor: pointer;
  transition: var(--transition);
  font-size: 0.9rem;
}
.add-to-cart:hover { background: var(--primary); }

/* ===== Features ===== */
.features { display: grid; grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); gap: 30px; }
.feature-card {
  background: var(--white);
  border-radius: var(--radius);
  padding: 35px 25px;
  text-align: center;
  box-shadow: var(--shadow);
}
.feature-icon { font-size: 2.2rem; margin-bottom: 15px; }
.feature-card h3 { font-size: 1.1rem; font-weight: 600; margin-bottom: 8px; }
.feature-card p { font-size: 0.9rem; color: var(--text-light); }

/* ===== Footer ===== */
footer {
  background: var(--dark);
  color: rgba(255,255,255,0.8);
  padding: 50px 20px 25px;
}
.footer-inner { max-width: 1200px; margin: 0 auto; display: grid; grid-template-columns: repeat(auto-fit, minmax(200px, 1fr)); gap: 40px; }
.footer-col h4 { color: var(--white); font-size: 1.05rem; margin-bottom: 18px; }
.footer-col p, .footer-col li { font-size: 0.9rem; margin-bottom: 8px; opacity: 0.8; cursor: pointer; }
.footer-col li:hover { opacity: 1; }
.footer-bottom {
  max-width: 1200px;
  margin: 40px auto 0;
  padding-top: 20px;
  border-top: 1px solid rgba(255,255,255,0.1);
  text-align: center;
  font-size: 0.85rem;
  opacity: 0.6;
}

/* ===== Cart Sidebar ===== */
.cart-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0,0,0,0.5);
  z-index: 2000;
  opacity: 0;
  visibility: hidden;
  transition: var(--transition);
}
.cart-overlay.active { opacity: 1; visibility: visible; }
.cart-sidebar {
  position: fixed;
  top: 0;
  right: -400px;
  width: 400px;
  max-width: 100vw;
  height: 100%;
  background: var(--white);
  z-index: 2001;
  transition: var(--transition);
  display: flex;
  flex-direction: column;
  box-shadow: -5px 0 30px rgba(0,0,0,0.1);
}
.cart-sidebar.active { right: 0; }
.cart-header {
  padding: 20px;
  border-bottom: 1px solid var(--gray-200);
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.cart-header h3 { font-size: 1.2rem; }
.cart-close {
  background: none;
  border: none;
  font-size: 1.5rem;
  cursor: pointer;
  color: var(--text-light);
  transition: var(--transition);
}
.cart-close:hover { color: var(--primary); }
.cart-items { flex: 1; overflow-y: auto; padding: 20px; }
.cart-item {
  display: flex;
  gap: 15px;
  padding: 15px 0;
  border-bottom: 1px solid var(--gray-100);
}
.cart-item-image {
  width: 70px;
  height: 70px;
  background: var(--gray-100);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.5rem;
  flex-shrink: 0;
}
.cart-item-info { flex: 1; }
.cart-item-name { font-weight: 600; font-size: 0.95rem; }
.cart-item-price { color: var(--primary); font-weight: 600; font-size: 0.9rem; margin-top: 3px; }
.cart-item-qty { display: flex; align-items: center; gap: 10px; margin-top: 8px; }
.qty-btn {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  border: 1px solid var(--gray-300);
  background: var(--white);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.85rem;
  transition: var(--transition);
}
.qty-btn:hover { border-color: var(--primary); color: var(--primary); }
.cart-item-qty span { font-weight: 600; min-width: 20px; text-align: center; }
.cart-item-remove {
  background: none;
  border: none;
  color: var(--text-light);
  cursor: pointer;
  font-size: 0.8rem;
  margin-top: 8px;
  display: block;
  transition: var(--transition);
}
.cart-item-remove:hover { color: var(--primary); }

.cart-footer {
  padding: 20px;
  border-top: 1px solid var(--gray-200);
}
.cart-total { display: flex; justify-content: space-between; font-size: 1.1rem; font-weight: 700; margin-bottom: 15px; }
.cart-checkout-btn { width: 100%; text-align: center; }
.cart-empty { text-align: center; padding: 40px 0; color: var(--text-light); }
.cart-empty-icon { font-size: 3rem; margin-bottom: 10px; }

/* ===== Toast ===== */
.toast-container {
  position: fixed;
  bottom: 20px;
  right: 20px;
  z-index: 3000;
}
.toast {
  background: var(--dark);
  color: white;
  padding: 14px 24px;
  border-radius: var(--radius-sm);
  margin-top: 10px;
  animation: slideIn 0.3s ease, fadeOut 0.3s ease 2.5s forwards;
  box-shadow: var(--shadow-lg);
  font-size: 0.9rem;
}
@keyframes slideIn {
  from { transform: translateX(100px); opacity: 0; }
  to { transform: translateX(0); opacity: 1; }
}
@keyframes fadeOut {
  to { opacity: 0; transform: translateX(100px); }
}

/* ===== Product Detail ===== */
.breadcrumb {
  max-width: 1200px;
  margin: 20px auto 0;
  padding: 0 20px;
  font-size: 0.85rem;
  color: var(--text-light);
}
.breadcrumb a { color: var(--primary); }
.breadcrumb span { margin: 0 8px; }

.product-detail {
  max-width: 1200px;
  margin: 40px auto;
  padding: 0 20px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 50px;
}
.product-detail-image {
  background: var(--gray-100);
  border-radius: var(--radius);
  height: 450px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 6rem;
}
.product-detail-info h1 { font-size: 1.8rem; margin-bottom: 10px; }
.product-detail-price { font-size: 1.8rem; font-weight: 700; color: var(--primary); margin: 15px 0; }
.product-detail-desc { color: var(--text-light); line-height: 1.8; margin-bottom: 20px; }
.product-detail-select { margin: 15px 0; }
.product-detail-select label { display: block; font-weight: 600; margin-bottom: 6px; }
.product-detail-select select {
  width: 100%;
  padding: 12px 16px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--gray-300);
  background: var(--white);
  font-size: 0.95rem;
}
.product-detail-actions { display: flex; gap: 12px; margin-top: 25px; }
.product-detail-actions .btn { flex: 1; text-align: center; }

/* ===== Checkout ===== */
.checkout-page { max-width: 1000px; margin: 40px auto; padding: 0 20px; display: grid; grid-template-columns: 1.2fr 0.8fr; gap: 40px; }
.checkout-page h1 { font-size: 1.6rem; margin-bottom: 30px; grid-column: 1 / -1; }
.form-group { margin-bottom: 18px; }
.form-group label { display: block; font-weight: 600; margin-bottom: 6px; font-size: 0.9rem; }
.form-group input, .form-group select, .form-group textarea {
  width: 100%;
  padding: 12px 16px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--gray-300);
  font-size: 0.95rem;
  transition: var(--transition);
}
.form-group input:focus, .form-group select:focus { border-color: var(--primary); box-shadow: 0 0 0 3px rgba(230,57,70,0.1); }
.form-row { display: grid; grid-template-columns: 1fr 1fr; gap: 15px; }

.order-summary {
  background: var(--gray-100);
  border-radius: var(--radius);
  padding: 25px;
  height: fit-content;
}
.order-summary h3 { font-size: 1.1rem; margin-bottom: 20px; }
.order-item { display: flex; gap: 12px; margin-bottom: 15px; }
.order-item-image {
  width: 50px;
  height: 50px;
  background: var(--white);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.2rem;
  flex-shrink: 0;
}
.order-item-info { flex: 1; font-size: 0.9rem; }
.order-item-price { font-weight: 600; color: var(--primary); }
.order-total-line { display: flex; justify-content: space-between; padding: 10px 0; font-size: 0.9rem; }
.order-total-line.big { font-size: 1.15rem; font-weight: 700; border-top: 2px solid var(--gray-300); padding-top: 15px; margin-top: 10px; }
.payment-icons { display: flex; gap: 10px; margin-top: 10px; font-size: 1.8rem; }

/* ===== Responsive ===== */
@media (max-width: 768px) {
  .hero h1 { font-size: 2rem; }
  .hero p { font-size: 1rem; }
  nav ul { gap: 15px; }
  nav ul li a { font-size: 0.85rem; }
  .cart-sidebar { width: 100%; }
  .section { padding: 50px 15px; }
  .products-grid { grid-template-columns: repeat(auto-fill, minmax(160px, 1fr)); gap: 15px; }
  .product-image { height: 180px; font-size: 2.5rem; }
  .header-actions .btn-sm { display: none; }
  .product-detail, .checkout-page { grid-template-columns: 1fr; }
  .product-detail-image { height: 280px; font-size: 4rem; }
  .form-row { grid-template-columns: 1fr; }
}