/* =====================================================
 * main.css - 前台商品页样式（响应式 + 明暗主题）
 * ===================================================== */
:root {
  --bg: #f4f5f9;
  --card: #ffffff;
  --text: #1f2329;
  --muted: #8a919f;
  --primary: #4f46e5;
  --primary-light: #eef0fe;
  --primary-dark: #4338ca;
  --accent: #f59e0b;
  --success: #16a34a;
  --danger: #e11d48;
  --border: #e6e8ef;
  --shadow: 0 8px 24px rgba(30, 34, 70, 0.08);
  --radius: 14px;
  --maxw: 1200px;
}
[data-theme="dark"] {
  --bg: #101218;
  --card: #1a1d27;
  --text: #e8eaf0;
  --muted: #7d8494;
  --primary: #7c83ff;
  --primary-light: #1e2130;
  --border: #2a2e3b;
  --shadow: 0 8px 24px rgba(0, 0, 0, 0.45);
}

* { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }
body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  transition: background .3s, color .3s;
}
img { max-width: 100%; display: block; }
a { color: var(--primary); text-decoration: none; }

.container { max-width: var(--maxw); margin: 0 auto; padding: 0 20px; }

/* ---------- 公告条 ---------- */
.notice-bar {
  background: linear-gradient(90deg, var(--primary), #7c3aed);
  color: #fff;
  font-size: 14px;
  text-align: center;
  padding: 8px 16px;
}
[data-theme="dark"] .notice-bar { background: linear-gradient(90deg, #3730a3, #6d28d9); }

/* ---------- 顶栏 ---------- */
.site-header {
  position: sticky; top: 0; z-index: 50;
  background: var(--card);
  border-bottom: 1px solid var(--border);
  backdrop-filter: blur(8px);
  transition: background .3s, border-color .3s;
}
.header-inner {
  display: flex; align-items: center; justify-content: space-between;
  padding: 14px 0; gap: 16px;
}
.brand .brand-title {
  font-size: 20px; font-weight: 800;
  background: linear-gradient(90deg, var(--primary), var(--accent));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  letter-spacing: .5px;
}
.brand .brand-sub { font-size: 13px; color: var(--muted); }
.header-actions { display: flex; align-items: center; gap: 10px; }

/* 按钮 */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 6px;
  border: 1px solid var(--border); background: var(--card); color: var(--text);
  padding: 8px 16px; border-radius: 10px; cursor: pointer;
  font-size: 14px; transition: all .2s;
}
.btn:hover { border-color: var(--primary); color: var(--primary); }
.btn-primary {
  background: var(--primary); border-color: var(--primary); color: #fff;
}
.btn-primary:hover { background: var(--primary-dark); color: #fff; }
.btn-ghost { background: transparent; }
.btn-sm { padding: 5px 12px; font-size: 13px; border-radius: 8px; }
.btn-block { width: 100%; }

.icon-btn {
  width: 38px; height: 38px; border-radius: 10px;
  border: 1px solid var(--border); background: var(--card); color: var(--text);
  cursor: pointer; font-size: 17px; display: inline-flex; align-items: center;
  justify-content: center; transition: all .2s;
}
.icon-btn:hover { color: var(--primary); border-color: var(--primary); }

/* ---------- 轮播 ---------- */
.banner-wrap { position: relative; margin: 18px auto; overflow: hidden; border-radius: var(--radius); box-shadow: var(--shadow); }
.banner-track { display: flex; transition: transform .5s ease; }
.banner-slide { min-width: 100%; }
.banner-slide img { width: 100%; height: 320px; object-fit: cover; }
.banner-dots {
  position: absolute; bottom: 14px; left: 0; right: 0;
  display: flex; gap: 8px; justify-content: center;
}
.banner-dots span {
  width: 8px; height: 8px; border-radius: 50%;
  background: rgba(255, 255, 255, .5); cursor: pointer; transition: all .25s;
}
.banner-dots span.active { background: #fff; transform: scale(1.3); }
.banner-arrow {
  position: absolute; top: 50%; transform: translateY(-50%);
  width: 36px; height: 36px; border-radius: 50%; border: none; cursor: pointer;
  background: rgba(0, 0, 0, .35); color: #fff; font-size: 18px;
  display: flex; align-items: center; justify-content: center;
}
.banner-arrow:hover { background: rgba(0, 0, 0, .55); }
.banner-arrow.prev { left: 14px; }
.banner-arrow.next { right: 14px; }

/* ---------- 工具栏（分类/搜索/排序） ---------- */
.shop-toolbar { display: flex; flex-wrap: wrap; align-items: center; gap: 12px; margin: 22px 0; }
.cat-tabs { display: flex; flex-wrap: wrap; gap: 8px; margin-right: auto; }
.cat-tab {
  padding: 7px 16px; border-radius: 20px; border: 1px solid var(--border);
  background: var(--card); color: var(--muted); cursor: pointer;
  font-size: 14px; transition: all .2s;
}
.cat-tab:hover { color: var(--primary); border-color: var(--primary); }
.cat-tab.active { background: var(--primary); border-color: var(--primary); color: #fff; font-weight: 600; }
.toolbar-right { display: flex; gap: 10px; align-items: center; flex-wrap: wrap; }

.search-box { position: relative; }
.search-box input {
  width: 230px; padding: 9px 36px 9px 14px; border-radius: 10px;
  border: 1px solid var(--border); background: var(--card); color: var(--text);
  font-size: 14px; outline: none; transition: border-color .2s;
}
.search-box input:focus { border-color: var(--primary); }
.search-box .search-icon {
  position: absolute; right: 12px; top: 50%; transform: translateY(-50%);
  color: var(--muted); pointer-events: none;
}
.sort-select {
  padding: 9px 12px; border-radius: 10px; border: 1px solid var(--border);
  background: var(--card); color: var(--text); font-size: 14px; outline: none; cursor: pointer;
}

.result-info { color: var(--muted); font-size: 13px; margin-bottom: 12px; }

/* ---------- 商品网格 ---------- */
.product-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 20px;
}
.product-card {
  background: var(--card); border: 1px solid var(--border);
  border-radius: var(--radius); overflow: hidden; cursor: pointer;
  transition: transform .25s, box-shadow .25s, border-color .25s;
  display: flex; flex-direction: column;
}
.product-card:hover { transform: translateY(-4px); box-shadow: var(--shadow); border-color: var(--primary); }
.card-media { position: relative; aspect-ratio: 1 / 1; background: #eee; overflow: hidden; }
[data-theme="dark"] .card-media { background: #232632; }
.card-media img {
  width: 100%; height: 100%; object-fit: cover;
  transition: transform .35s;
}
.product-card:hover .card-media img { transform: scale(1.06); }
.card-badges { position: absolute; top: 10px; left: 10px; display: flex; gap: 6px; flex-wrap: wrap; }
.badge {
  padding: 3px 9px; border-radius: 6px; font-size: 12px; font-weight: 600; color: #fff;
}
.badge.tag { background: var(--primary); }
.badge.new { background: var(--success); }
.badge.hot { background: #ef4444; }
.badge.sale { background: var(--accent); }
.badge.off { background: #9ca3af; }
.card-body { padding: 14px 14px 16px; display: flex; flex-direction: column; gap: 8px; flex: 1; }
.card-cat { font-size: 12px; color: var(--muted); }
.card-name {
  font-size: 15px; font-weight: 600; line-height: 1.4;
  display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden;
  min-height: 42px;
}
.card-price-row { display: flex; align-items: baseline; gap: 8px; flex-wrap: wrap; }
.price { color: var(--danger); font-size: 20px; font-weight: 800; }
.price .unit { font-size: 13px; font-weight: 600; }
.original-price { color: var(--muted); font-size: 13px; text-decoration: line-through; }
.card-meta { display: flex; align-items: center; justify-content: space-between; font-size: 12px; color: var(--muted); }
.card-meta .rating { color: var(--accent); font-weight: 600; }
.out-stock { opacity: .55; position: relative; }
.out-stock .card-media::after {
  content: "已售罄"; position: absolute; inset: 0; display: flex; align-items: center;
  justify-content: center; background: rgba(0, 0, 0, .45); color: #fff;
  font-size: 18px; font-weight: 700; letter-spacing: 4px;
}
.card-footer { display: flex; gap: 8px; margin-top: auto; }
.card-footer .btn { flex: 1; }

/* 空状态 */
.empty-state { text-align: center; padding: 70px 20px; color: var(--muted); }
.empty-state .empty-icon { font-size: 56px; margin-bottom: 12px; }

/* ---------- 分页 ---------- */
.pagination { display: flex; gap: 6px; justify-content: center; margin: 32px 0 10px; flex-wrap: wrap; }
.page-btn {
  min-width: 38px; height: 38px; padding: 0 10px; border-radius: 9px;
  border: 1px solid var(--border); background: var(--card); color: var(--text);
  cursor: pointer; font-size: 14px; transition: all .2s;
}
.page-btn:hover { border-color: var(--primary); color: var(--primary); }
.page-btn.active { background: var(--primary); border-color: var(--primary); color: #fff; font-weight: 600; }
.page-btn:disabled { opacity: .4; cursor: not-allowed; }

/* ---------- 页脚 ---------- */
.site-footer { text-align: center; padding: 26px 20px 34px; color: var(--muted); font-size: 13px; }

/* ---------- 弹窗 ---------- */
.modal-overlay {
  position: fixed; inset: 0; z-index: 100;
  background: rgba(0, 0, 0, .55);
  display: flex; align-items: center; justify-content: center;
  padding: 20px; opacity: 0; pointer-events: none; transition: opacity .25s;
}
.modal-overlay.open { opacity: 1; pointer-events: auto; }
.modal {
  background: var(--card); border-radius: 16px; max-width: 900px; width: 100%;
  max-height: 88vh; overflow: hidden; position: relative;
  box-shadow: 0 24px 60px rgba(0, 0, 0, .3);
  transform: translateY(16px) scale(.98); transition: transform .25s;
}
.modal-overlay.open .modal { transform: translateY(0) scale(1); }
.modal-close {
  position: absolute; top: 12px; right: 12px; z-index: 5;
  width: 36px; height: 36px; border-radius: 50%; border: none; cursor: pointer;
  background: rgba(0, 0, 0, .35); color: #fff; font-size: 18px;
  display: flex; align-items: center; justify-content: center; transition: background .2s;
}
.modal-close:hover { background: rgba(0, 0, 0, .6); }
.modal-body { max-height: 88vh; overflow-y: auto; }

/* 商品详情弹窗 */
.detail-layout { display: grid; grid-template-columns: 1fr 1fr; }
.detail-media { position: relative; background: #f0f1f4; }
[data-theme="dark"] .detail-media { background: #232632; }
.detail-media img { width: 100%; height: 100%; object-fit: cover; position: absolute; inset: 0; }
.detail-media::after { content: ""; display: block; padding-top: 100%; }
.detail-info { padding: 26px; display: flex; flex-direction: column; gap: 14px; }
.detail-cat { display: inline-flex; align-self: flex-start; padding: 4px 12px; border-radius: 8px; background: var(--primary-light); color: var(--primary); font-size: 13px; font-weight: 600; }
.detail-name { font-size: 24px; font-weight: 800; line-height: 1.3; }
.detail-price-row { display: flex; align-items: baseline; gap: 10px; flex-wrap: wrap; }
.detail-price { color: var(--danger); font-size: 30px; font-weight: 800; }
.detail-price .unit { font-size: 16px; }
.detail-original { color: var(--muted); text-decoration: line-through; }
.detail-meta-list { display: flex; flex-direction: column; gap: 8px; font-size: 14px; color: var(--muted); }
.detail-meta-list .meta-item b { color: var(--text); font-weight: 600; }
.detail-tags { display: flex; gap: 8px; flex-wrap: wrap; }
.detail-desc {
  border-top: 1px dashed var(--border); padding-top: 14px;
  font-size: 14.5px; color: var(--text); line-height: 1.8;
}
.detail-desc p { margin-bottom: 8px; }
.detail-desc ul, .detail-desc ol { margin: 6px 0 10px; padding-left: 22px; }
.detail-desc li { margin-bottom: 4px; }
.detail-desc blockquote { border-left: 4px solid var(--primary); background: var(--primary-light); padding: 8px 14px; margin: 10px 0; border-radius: 0 8px 8px 0; color: var(--muted); }
.detail-desc h1, .detail-desc h2, .detail-desc h3, .detail-desc h4 { margin: 12px 0 8px; }
.detail-desc img { border-radius: 8px; margin: 8px 0; }
.detail-actions { display: flex; gap: 12px; margin-top: auto; }
.detail-actions .btn { flex: 1; padding: 12px; font-size: 15px; }

/* 支付码弹窗 */
.pay-modal { max-width: 420px; text-align: center; }
.pay-modal .pay-head { padding: 18px; border-bottom: 1px dashed var(--border); }
.pay-modal .pay-head h3 { font-size: 18px; }
.pay-modal .pay-img-wrap { padding: 24px; }
.pay-modal .pay-img-wrap img {
  width: 240px; height: 240px; object-fit: contain; margin: 0 auto;
  border-radius: 12px; border: 1px solid var(--border);
}
.pay-modal .pay-tip { padding: 0 20px 20px; font-size: 14px; color: var(--muted); }
.pay-modal .pay-note { margin: 0 20px 20px; padding: 10px; border-radius: 8px; background: var(--primary-light); color: var(--primary); font-size: 13px; }

/* ---------- Toast ---------- */
#toast-wrap {
  position: fixed; top: 20px; left: 50%; transform: translateX(-50%);
  z-index: 300; display: flex; flex-direction: column; gap: 8px; align-items: center;
}
.toast {
  background: #1f2329; color: #fff; padding: 10px 20px; border-radius: 10px;
  font-size: 14px; box-shadow: 0 8px 24px rgba(0, 0, 0, .2);
  animation: toastIn .3s ease;
  max-width: 90vw;
}
.toast.success { background: var(--success); }
.toast.error { background: var(--danger); }
.toast.info { background: var(--primary); }
@keyframes toastIn { from { opacity: 0; transform: translateY(-10px); } to { opacity: 1; transform: translateY(0); } }

/* ---------- 加载 ---------- */
#loading { display: flex; flex-direction: column; align-items: center; justify-content: center; padding: 80px 0; color: var(--muted); gap: 14px; }
.spinner {
  width: 38px; height: 38px; border-radius: 50%;
  border: 3px solid var(--border); border-top-color: var(--primary);
  animation: spin .8s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

/* ---------- 响应式 ---------- */
@media (max-width: 768px) {
  .banner-slide img { height: 180px; }
  .detail-layout { grid-template-columns: 1fr; }
  .detail-media::after { padding-top: 80%; }
  .product-grid { grid-template-columns: repeat(2, 1fr); gap: 12px; }
  .card-body { padding: 10px; }
  .card-name { font-size: 13px; min-height: 36px; }
  .price { font-size: 16px; }
  .search-box input { width: 170px; }
  .header-inner { flex-wrap: wrap; }
}
@media (max-width: 420px) {
  .product-grid { grid-template-columns: 1fr 1fr; }
  .card-footer { flex-direction: column; }
}