/* ========== 基础 ========== */
:root {
  --primary: #22a6b3;
  --primary-dark: #1b8a95;
  --accent: #ff7364;
  --text: #2d3436;
  --text-light: #7a8085;
  --bg: #f5f7fa;
  --card: #ffffff;
  --shadow: 0 6px 24px rgba(45, 52, 54, .08);
  --radius: 14px;
}

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

html { scroll-behavior: smooth; }

body {
  font-family: "PingFang SC", "Microsoft YaHei", "Segoe UI", sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.6;
}

a { text-decoration: none; color: inherit; }
ul { list-style: none; }
img { display: block; max-width: 100%; }

.container { max-width: 1200px; margin: 0 auto; padding: 0 16px; }

/* ========== 顶部通栏 ========== */
.topbar {
  background: linear-gradient(90deg, var(--primary), #1b8a95);
  color: #fff;
  font-size: 13px;
}
.topbar-inner {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 34px;
}
.topbar-links a { margin-left: 16px; opacity: .9; transition: opacity .2s; }
.topbar-links a:hover { opacity: 1; text-decoration: underline; }

/* ========== 头部 ========== */
.header { background: #fff; box-shadow: var(--shadow); position: sticky; top: 0; z-index: 100; }
.header-inner {
  display: flex;
  align-items: center;
  gap: 24px;
  height: 76px;
}
.logo {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 26px;
  font-weight: 800;
  color: var(--primary);
  white-space: nowrap;
}
.logo em { font-style: normal; color: var(--accent); }
.logo i { font-size: 30px; }

.search-box {
  flex: 1;
  display: flex;
  max-width: 560px;
  border: 2px solid var(--primary);
  border-radius: 40px;
  overflow: hidden;
  background: #fff;
}
.search-box input {
  flex: 1;
  border: none;
  outline: none;
  padding: 10px 18px;
  font-size: 14px;
}
.search-box button {
  border: none;
  background: var(--primary);
  color: #fff;
  padding: 0 26px;
  font-size: 15px;
  cursor: pointer;
  transition: background .2s;
}
.search-box button:hover { background: var(--primary-dark); }

.cart-btn {
  position: relative;
  display: flex;
  align-items: center;
  gap: 8px;
  border: 1px solid var(--primary);
  background: #fff;
  color: var(--primary);
  padding: 9px 20px;
  border-radius: 40px;
  font-size: 15px;
  cursor: pointer;
  transition: all .2s;
}
.cart-btn:hover { background: var(--primary); color: #fff; }
.cart-count {
  position: absolute;
  top: -8px;
  right: -8px;
  background: var(--accent);
  color: #fff;
  min-width: 20px;
  height: 20px;
  border-radius: 10px;
  font-size: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 0 5px;
}

.nav-toggle {
  display: none;
  border: none;
  background: none;
  font-size: 22px;
  color: var(--text);
  cursor: pointer;
}

/* ========== 导航 ========== */
.nav { background: #fff; border-bottom: 1px solid #eef1f4; }
.nav-list { display: flex; }
.nav-list a {
  display: block;
  padding: 13px 26px;
  font-size: 15px;
  font-weight: 500;
  position: relative;
  transition: color .2s;
}
.nav-list a:hover { color: var(--primary); }
.nav-list a.active { color: var(--primary); }
.nav-list a.active::after {
  content: "";
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
  bottom: 0;
  width: 28px;
  height: 3px;
  border-radius: 3px;
  background: var(--primary);
}

/* ========== 轮播图 ========== */
.carousel {
  position: relative;
  margin-top: 20px;
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
}
.carousel-track {
  display: flex;
  transition: transform .6s cubic-bezier(.25, .8, .35, 1);
}
.carousel-slide { position: relative; min-width: 100%; aspect-ratio: 1536 / 560; }
.carousel-slide img { width: 100%; height: 100%; object-fit: cover; }

.carousel-caption {
  position: absolute;
  left: 8%;
  top: 50%;
  transform: translateY(-50%);
  color: #fff;
  max-width: 460px;
  text-shadow: 0 2px 12px rgba(0,0,0,.35);
  animation: fadeUp .8s ease;
}
.carousel-caption h2 { font-size: clamp(24px, 3.4vw, 40px); margin-bottom: 10px; }
.carousel-caption p { font-size: clamp(14px, 1.6vw, 18px); margin-bottom: 22px; opacity: .95; }

@keyframes fadeUp {
  from { opacity: 0; transform: translateY(28px); }
  to { opacity: 1; transform: translateY(-50%); }
}

.carousel-arrow {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  width: 44px;
  height: 44px;
  border: none;
  border-radius: 50%;
  background: rgba(255,255,255,.55);
  color: #fff;
  font-size: 18px;
  cursor: pointer;
  transition: all .25s;
  backdrop-filter: blur(4px);
}
.carousel-arrow:hover { background: var(--primary); }
.carousel-arrow.prev { left: 18px; }
.carousel-arrow.next { right: 18px; }

.carousel-dots {
  position: absolute;
  bottom: 16px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  gap: 10px;
}
.dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  border: 2px solid #fff;
  background: rgba(255,255,255,.4);
  cursor: pointer;
  transition: all .25s;
}
.dot.active { background: #fff; transform: scale(1.25); }

/* ========== 按钮 ========== */
.btn {
  display: inline-block;
  padding: 11px 30px;
  border: none;
  border-radius: 40px;
  font-size: 15px;
  font-weight: 600;
  cursor: pointer;
  transition: all .25s;
}
.btn-primary { background: var(--accent); color: #fff; box-shadow: 0 6px 18px rgba(255,115,100,.4); }
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 10px 22px rgba(255,115,100,.5); }
.btn-light { background: #fff; color: var(--text); }
.btn-light:hover { transform: translateY(-2px); }
.btn-outline { background: transparent; border: 2px solid var(--primary); color: var(--primary); }
.btn-outline:hover { background: var(--primary); color: #fff; }

/* ========== 服务保障 ========== */
.services {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 14px;
  margin: 20px 0;
}
.service-item {
  background: var(--card);
  border-radius: var(--radius);
  padding: 16px 12px;
  text-align: center;
  font-size: 14px;
  font-weight: 500;
  color: var(--text-light);
  box-shadow: var(--shadow);
}
.service-item i { color: var(--primary); font-size: 20px; margin-right: 8px; }

/* ========== 通用区块 ========== */
.section { margin: 46px 0; }
.section-head { text-align: center; margin-bottom: 30px; }
.section-head h2 {
  font-size: 28px;
  position: relative;
  display: inline-block;
  padding-bottom: 12px;
}
.section-head h2::after {
  content: "";
  position: absolute;
  left: 50%;
  transform: translateX(-50%);
  bottom: 0;
  width: 48px;
  height: 4px;
  border-radius: 4px;
  background: linear-gradient(90deg, var(--primary), var(--accent));
}
.section-head p { color: var(--text-light); margin-top: 8px; font-size: 14px; }

/* ========== 商品分类 ========== */
.category-grid {
  display: grid;
  grid-template-columns: repeat(6, 1fr);
  gap: 16px;
}
.category-card {
  background: var(--card);
  border-radius: var(--radius);
  padding: 26px 12px;
  text-align: center;
  box-shadow: var(--shadow);
  transition: all .3s;
}
.category-card:hover { transform: translateY(-8px); }
.category-icon {
  width: 72px;
  height: 72px;
  margin: 0 auto 14px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 30px;
  color: #fff;
  background: linear-gradient(135deg, var(--c1), var(--c2));
  transition: transform .3s;
}
.category-card:hover .category-icon { transform: scale(1.12) rotate(-6deg); }
.category-card h3 { font-size: 16px; margin-bottom: 4px; }
.category-card span { font-size: 12px; color: var(--text-light); }

/* ========== 促销活动 ========== */
.promo-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  grid-auto-rows: 220px;
  gap: 16px;
}
.promo-card {
  position: relative;
  border-radius: var(--radius);
  padding: 24px;
  color: #fff;
  overflow: hidden;
  background: linear-gradient(135deg, var(--c1), var(--c2));
  display: flex;
  flex-direction: column;
  justify-content: center;
  transition: transform .3s, box-shadow .3s;
}
.promo-card:hover { transform: translateY(-6px); box-shadow: 0 16px 32px rgba(0,0,0,.18); }
.promo-big { grid-row: span 2; }
.promo-tag {
  position: absolute;
  top: 16px;
  right: -30px;
  transform: rotate(45deg);
  background: rgba(255,255,255,.25);
  padding: 4px 36px;
  font-size: 12px;
  backdrop-filter: blur(2px);
}
.promo-body h3 { font-size: 22px; margin-bottom: 6px; }
.promo-body p { font-size: 14px; opacity: .92; margin-bottom: 16px; }
.promo-body strong { font-size: 20px; }
.promo-body .btn { margin-top: 6px; }

.countdown { display: flex; gap: 10px; margin-bottom: 18px; }
.cd-block {
  background: rgba(255,255,255,.2);
  border-radius: 8px;
  padding: 8px 10px;
  text-align: center;
  min-width: 54px;
  backdrop-filter: blur(2px);
}
.cd-block b { display: block; font-size: 22px; font-variant-numeric: tabular-nums; }
.cd-block i { font-style: normal; font-size: 12px; opacity: .9; }

/* ========== 热门商品 ========== */
.tabs {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 10px;
  margin-bottom: 26px;
}
.tab {
  border: 1px solid #dde3e8;
  background: #fff;
  color: var(--text-light);
  padding: 8px 22px;
  border-radius: 40px;
  font-size: 14px;
  cursor: pointer;
  transition: all .25s;
}
.tab:hover { border-color: var(--primary); color: var(--primary); }
.tab.active { background: var(--primary); border-color: var(--primary); color: #fff; }

.product-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 18px;
}
.product-card {
  background: var(--card);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow);
  transition: transform .3s, box-shadow .3s;
  animation: cardIn .5s ease both;
}
@keyframes cardIn {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: none; }
}
.product-card:hover { transform: translateY(-8px); box-shadow: 0 16px 36px rgba(45,52,54,.14); }

.product-img { position: relative; aspect-ratio: 1; overflow: hidden; background: #f2f4f6; }
.product-img img { width: 100%; height: 100%; object-fit: cover; transition: transform .5s; }
.product-card:hover .product-img img { transform: scale(1.08); }

.product-badge {
  position: absolute;
  top: 12px;
  left: 12px;
  background: var(--accent);
  color: #fff;
  font-size: 12px;
  padding: 3px 10px;
  border-radius: 20px;
}
.product-badge.new { background: var(--primary); }

.product-info { padding: 14px 16px 18px; }
.product-name {
  font-size: 15px;
  font-weight: 600;
  margin-bottom: 6px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.product-name span { font-size: 12px; color: var(--primary); margin-left: 6px; }
.product-meta { display: flex; align-items: center; gap: 10px; font-size: 12px; color: var(--text-light); margin-bottom: 10px; }
.rating { color: #f9ca24; }
.product-bottom { display: flex; align-items: center; justify-content: space-between; }
.price { color: var(--accent); font-size: 20px; font-weight: 800; }
.price small { font-size: 12px; }
.price del { color: #b2bec3; font-size: 12px; font-weight: 400; margin-left: 6px; }

.add-cart {
  width: 38px;
  height: 38px;
  border: none;
  border-radius: 50%;
  background: var(--primary);
  color: #fff;
  font-size: 15px;
  cursor: pointer;
  transition: all .25s;
}
.add-cart:hover { background: var(--accent); transform: scale(1.12) rotate(-8deg); }

.load-more { text-align: center; margin-top: 30px; }

/* ========== 页脚 ========== */
.footer { background: #2d3436; color: #b2bec3; margin-top: 60px; }
.footer-inner {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr 1fr;
  gap: 30px;
  padding: 46px 16px 30px;
}
.footer-brand .logo { color: #fff; margin-bottom: 12px; }
.footer-brand .logo em { color: var(--accent); }
.footer-brand p { font-size: 13px; line-height: 1.8; }
.footer-col h4 { color: #fff; font-size: 15px; margin-bottom: 14px; }
.footer-col a { display: block; font-size: 13px; margin-bottom: 10px; transition: color .2s; }
.footer-col a:hover { color: var(--primary); }
.footer-bottom {
  border-top: 1px solid #3d4649;
  text-align: center;
  font-size: 12px;
  padding: 16px 0;
}

/* ========== 返回顶部 / Toast ========== */
.back-top {
  position: fixed;
  right: 26px;
  bottom: 36px;
  width: 46px;
  height: 46px;
  border: none;
  border-radius: 50%;
  background: var(--primary);
  color: #fff;
  font-size: 16px;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  transition: all .3s;
  box-shadow: 0 8px 20px rgba(34,166,179,.4);
  z-index: 99;
}
.back-top.show { opacity: 1; visibility: visible; }
.back-top:hover { background: var(--primary-dark); transform: translateY(-4px); }

.toast {
  position: fixed;
  left: 50%;
  bottom: 60px;
  transform: translate(-50%, 20px);
  background: rgba(45, 52, 54, .92);
  color: #fff;
  padding: 12px 24px;
  border-radius: 40px;
  font-size: 14px;
  opacity: 0;
  pointer-events: none;
  transition: all .35s;
  z-index: 200;
}
.toast.show { opacity: 1; transform: translate(-50%, 0); }
.toast i { color: #2ecc71; margin-right: 8px; }

/* ========== 响应式 ========== */
@media (max-width: 992px) {
  .category-grid { grid-template-columns: repeat(3, 1fr); }
  .product-grid { grid-template-columns: repeat(3, 1fr); }
  .promo-grid { grid-template-columns: repeat(2, 1fr); grid-auto-rows: 200px; }
  .services { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
  .header-inner { height: auto; flex-wrap: wrap; padding: 12px 0; gap: 12px; }
  .search-box { order: 3; max-width: 100%; flex-basis: 100%; }
  .nav-toggle { display: block; margin-left: auto; }
  .nav { display: none; }
  .nav.open { display: block; }
  .nav-list { flex-direction: column; }
  .nav-list a { padding: 12px 16px; border-top: 1px solid #eef1f4; }
  .product-grid { grid-template-columns: repeat(2, 1fr); }
  .promo-grid { grid-template-columns: 1fr; grid-auto-rows: auto; }
  .promo-card { min-height: 180px; }
  .footer-inner { grid-template-columns: 1fr 1fr; }
  .topbar-links { display: none; }
  .topbar-inner { justify-content: center; }
}

@media (max-width: 480px) {
  .category-grid { grid-template-columns: repeat(2, 1fr); }
  .product-grid { grid-template-columns: 1fr; }
  .carousel-caption { left: 6%; max-width: 80%; }
  .services { grid-template-columns: 1fr; }
  .footer-inner { grid-template-columns: 1fr; }
}