/* ===== 全站基础样式 + 双主题 ===== */
* { margin: 0; padding: 0; box-sizing: border-box; }
body { font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif; line-height: 1.6; min-height: 100vh; display: flex; flex-direction: column; }
a { text-decoration: none; color: inherit; }
img { max-width: 100%; }
.container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }

/* ===== Classic 主题（默认：蓝白简洁） ===== */
body.theme-classic { --primary: #2563eb; --primary-light: #dbeafe; --bg: #f8fafc; --card-bg: #fff; --text: #1e293b; --text-muted: #64748b; --border: #e2e8f0; --header-bg: #fff; --accent: #f59e0b; background: var(--bg); color: var(--text); }
body.theme-classic .header { background: var(--header-bg); border-bottom: 1px solid var(--border); box-shadow: 0 1px 3px rgba(0,0,0,.05); }

/* ===== Modern 主题（深色渐变） ===== */
body.theme-modern { --primary: #8b5cf6; --primary-light: #ede9fe; --bg: #0f0f1a; --card-bg: #1a1a2e; --text: #e4e4ef; --text-muted: #8888a0; --border: #2a2a4a; --header-bg: #16162a; --accent: #ec4899; background: var(--bg); color: var(--text); }
body.theme-modern .header { background: var(--header-bg); border-bottom: 1px solid var(--border); }
body.theme-modern .card { background: var(--card-bg); border: 1px solid var(--border); }
body.theme-modern .product-card { background: var(--card-bg); border: 1px solid var(--border); }
body.theme-modern .nav a { color: var(--text); }
body.theme-modern input, body.theme-modern select, body.theme-modern textarea { background: var(--card-bg); color: var(--text); border-color: var(--border); }

/* ===== 通用组件 ===== */
.header { position: sticky; top: 0; z-index: 100; background: var(--header-bg); }
.nav { display: flex; align-items: center; justify-content: space-between; padding: 12px 0; }
.nav .logo { font-size: 20px; font-weight: 700; color: var(--primary); }
.nav .menu { display: flex; gap: 24px; align-items: center; }
.nav .menu a { color: var(--text); font-size: 14px; transition: color .2s; }
.nav .menu a:hover, .nav .menu a.active { color: var(--primary); }
.btn { display: inline-block; padding: 8px 20px; border-radius: 8px; border: none; cursor: pointer; font-size: 14px; transition: all .2s; background: var(--primary); color: #fff; }
.btn:hover { opacity: .9; transform: translateY(-1px); }
.btn-outline { background: transparent; border: 1px solid var(--primary); color: var(--primary); }
.btn-danger { background: #ef4444; }
.btn-sm { padding: 4px 12px; font-size: 12px; }
.btn-lg { padding: 12px 32px; font-size: 16px; }
.btn-block { width: 100%; }
.btn:disabled { opacity: .55; cursor: not-allowed; transform: none; }
.hero { padding: 60px 0; text-align: center; }
.hero h1 { font-size: 36px; margin-bottom: 12px; }
.hero p { color: var(--text-muted); font-size: 16px; }
.section { padding: 40px 0; }
.section-title { font-size: 22px; margin-bottom: 20px; display: flex; align-items: center; gap: 8px; }
.grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 20px; }
.product-card { background: var(--card-bg); border-radius: 12px; overflow: hidden; border: 1px solid var(--border); transition: transform .2s, box-shadow .2s; cursor: pointer; }
.product-card:hover { transform: translateY(-3px); box-shadow: 0 8px 24px rgba(0,0,0,.1); }
.product-card .cover { width: 100%; height: 160px; background: var(--primary-light); display: flex; align-items: center; justify-content: center; font-size: 48px; overflow: hidden; }
.product-card .cover img { max-width: 100%; max-height: 100%; object-fit: contain; }
.product-card .body { padding: 16px; }
.product-card .title { font-size: 15px; font-weight: 600; margin-bottom: 8px; line-height: 1.4; display: -webkit-box; -webkit-line-clamp: 2; -webkit-box-orient: vertical; overflow: hidden; }
.product-card .meta { display: flex; justify-content: space-between; align-items: center; margin-top: 12px; }
.price { color: #ef4444; font-weight: 700; font-size: 18px; }
.price .origin { color: var(--text-muted); font-size: 12px; text-decoration: line-through; font-weight: 400; margin-left: 4px; }
.tag { display: inline-block; padding: 2px 8px; border-radius: 4px; font-size: 11px; background: var(--primary-light); color: var(--primary); }
.tag-vip { background: #fef3c7; color: #b45309; }
.tag-fast { background: #dcfce7; color: #166534; }
.category-bar { display: flex; gap: 8px; flex-wrap: wrap; margin: 16px 0; }
.category-chip { padding: 6px 14px; border-radius: 20px; background: var(--card-bg); border: 1px solid var(--border); cursor: pointer; font-size: 14px; transition: all .2s; }
.category-chip.active, .category-chip:hover { background: var(--primary); color: #fff; border-color: var(--primary); }

/* 树形分类（hover 下拉） */
.category-bar.tree { align-items: flex-start; position: relative; }
.cat-group { position: relative; display: inline-block; }
.cat-root, .cat-child { padding: 6px 14px; border-radius: 20px; background: var(--card-bg); border: 1px solid var(--border); cursor: pointer; font-size: 14px; transition: all .2s; user-select: none; display: inline-flex; align-items: center; gap: 6px; }
.cat-root:hover, .cat-child:hover { background: var(--primary); color: #fff; border-color: var(--primary); }
.cat-root.active, .cat-child.active { background: var(--primary); color: #fff; border-color: var(--primary); }
.cat-root .arrow { font-size: 10px; opacity: .7; margin-left: 2px; }
.cat-children {
  display: none;
  position: absolute;
  top: calc(100% + 6px);
  left: 0;
  z-index: 100;
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 6px;
  box-shadow: 0 6px 20px rgba(0,0,0,.12);
  min-width: 120px;
  flex-direction: column;
  gap: 4px;
}
.cat-group:hover > .cat-children, .cat-group.expanded > .cat-children { display: flex; }
.cat-child { padding: 6px 12px; font-size: 13px; background: var(--bg); border-radius: 16px; white-space: nowrap; }
.cat-child-all { font-weight: 600; }
.footer { margin-top: auto; padding: 30px 0; text-align: center; color: var(--text-muted); font-size: 13px; border-top: 1px solid var(--border); }

/* 表单 */
.form-group { margin-bottom: 16px; }
.form-group label { display: block; margin-bottom: 6px; font-size: 14px; color: var(--text-muted); }
.form-group input, .form-group select, .form-group textarea { width: 100%; padding: 10px 12px; border: 1px solid var(--border); border-radius: 8px; font-size: 14px; background: var(--card-bg); color: var(--text); }
.auth-box { max-width: 400px; margin: 60px auto; padding: 32px; background: var(--card-bg); border-radius: 16px; border: 1px solid var(--border); }
.auth-box h2 { text-align: center; margin-bottom: 24px; }

/* 会员卡 */
.vip-cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; margin: 30px 0; }
.vip-card { background: var(--card-bg); border: 2px solid var(--border); border-radius: 16px; padding: 30px; text-align: center; position: relative; transition: all .2s; }
.vip-card:hover, .vip-card.featured { border-color: var(--accent); transform: scale(1.03); }
.vip-card .badge { position: absolute; top: -10px; left: 50%; transform: translateX(-50%); background: var(--accent); color: #fff; padding: 2px 12px; border-radius: 10px; font-size: 12px; }
.vip-card .price { font-size: 36px; margin: 12px 0; }
.vip-card .period { color: var(--text-muted); font-size: 14px; }

/* 表格 */
.table-wrap { overflow-x: auto; background: var(--card-bg); border-radius: 12px; border: 1px solid var(--border); }
table { width: 100%; border-collapse: collapse; font-size: 14px; }
th, td { padding: 12px 16px; text-align: left; border-bottom: 1px solid var(--border); }
th { background: var(--primary-light); font-weight: 600; }

/* 提示 */
.toast { position: fixed; top: 20px; left: 50%; transform: translateX(-50%); padding: 12px 24px; border-radius: 8px; color: #fff; z-index: 999; display: none; }
.toast.show { display: block; }
.toast.success { background: #10b981; }
.toast.error { background: #ef4444; }

/* 后台布局 */
.admin-layout { display: flex; min-height: 100vh; }
.admin-sidebar { width: 220px; background: var(--header-bg); border-right: 1px solid var(--border); padding: 20px 0; }
.admin-sidebar a { display: block; padding: 10px 20px; color: var(--text); font-size: 14px; }
.admin-sidebar a:hover, .admin-sidebar a.active { background: var(--primary-light); color: var(--primary); }
.admin-main { flex: 1; padding: 24px; }
.admin-main h1 { font-size: 20px; margin-bottom: 20px; }

/* 响应式样式统一放在文件末尾（手机 / iPad） */

/* ================= 以下为功能扩展样式 ================= */

/* 搜索条 */
.search-bar { display: flex; gap: 10px; margin: 20px 0; flex-wrap: wrap; }
.search-bar input { flex: 1; min-width: 200px; padding: 10px 14px; border: 1px solid var(--border); border-radius: 8px; font-size: 14px; background: var(--card-bg); color: var(--text); }
.search-bar select { padding: 10px 12px; border: 1px solid var(--border); border-radius: 8px; background: var(--card-bg); color: var(--text); font-size: 14px; }

/* 卡片 / 面板 */
.card { background: var(--card-bg); border: 1px solid var(--border); border-radius: 14px; padding: 20px; }
.panel { background: var(--card-bg); border: 1px solid var(--border); border-radius: 14px; padding: 24px; }
.settings-group { background: var(--card-bg); border: 1px solid var(--border); border-radius: 12px; margin-bottom: 14px; overflow: hidden; }
.settings-group summary { padding: 14px 18px; font-size: 15px; font-weight: 600; cursor: pointer; display: flex; align-items: center; justify-content: space-between; background: var(--bg); list-style: none; user-select: none; }
.settings-group summary::-webkit-details-marker { display: none; }
.settings-group summary::after { content: '▾'; font-size: 12px; color: var(--text-muted); transition: transform .2s; }
.settings-group[open] summary::after { transform: rotate(180deg); }
.settings-group .group-body { padding: 18px; }
.settings-actions { display: flex; gap: 12px; flex-wrap: wrap; margin-top: 8px; }
.hint { color: var(--text-muted); font-size: 13px; }
.muted { color: var(--text-muted); }
.center { text-align: center; }
.row { display: flex; gap: 12px; flex-wrap: wrap; align-items: center; }
.between { display: flex; justify-content: space-between; align-items: center; gap: 12px; flex-wrap: wrap; }
.spacer { height: 1px; background: var(--border); margin: 20px 0; border: 0; }

/* 数据卡片（后台概览） */
.stat-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(180px, 1fr)); gap: 16px; margin-bottom: 24px; }
.stat-card { background: var(--card-bg); border: 1px solid var(--border); border-radius: 12px; padding: 18px; }
.stat-card .label { color: var(--text-muted); font-size: 13px; }
.stat-card .value { font-size: 26px; font-weight: 700; color: var(--primary); margin-top: 6px; }
.stat-card .sub { font-size: 12px; color: var(--text-muted); margin-top: 4px; }

/* 首页板块条 */
.section-banner { background: linear-gradient(135deg, var(--primary), var(--accent)); color: #fff; border-radius: 14px; padding: 24px 28px; margin-bottom: 16px; }
.section-banner h3 { font-size: 18px; margin-bottom: 6px; }
.section-banner p { opacity: .92; font-size: 14px; }

/* 详情页 */
.detail-grid { display: grid; grid-template-columns: 1fr 2fr; gap: 30px; }
.detail-cover { background: var(--primary-light); border-radius: 16px; height: 300px; display: flex; align-items: center; justify-content: center; font-size: 80px; overflow: hidden; }
.detail-cover img { max-width: 100%; max-height: 100%; object-fit: contain; }
.info-list { display: grid; grid-template-columns: repeat(2, 1fr); gap: 10px 20px; margin: 18px 0; font-size: 14px; }
.info-list .k { color: var(--text-muted); }

/* 支付弹窗 / 编辑弹窗 */
.modal-mask { position: fixed; inset: 0; background: rgba(0,0,0,.7); z-index: 999; display: flex; align-items: center; justify-content: center; padding: 20px; }
.modal-box { background: var(--card-bg); width: 100%; max-width: min(620px, calc(100vw - 32px)); max-height: calc(100vh - 32px); border-radius: 14px; display: flex; flex-direction: column; overflow: hidden; box-shadow: 0 20px 60px rgba(0,0,0,.25); }
.modal-header { position: relative; display: flex; align-items: center; justify-content: space-between; padding: 14px 18px; border-bottom: 1px solid var(--border); background: var(--card-bg); flex-shrink: 0; }
.modal-title { font-size: 16px; font-weight: 700; color: var(--text); padding-right: 40px; }
.modal-close { position: absolute; top: 50%; right: 18px; transform: translateY(-50%); width: 32px; height: 32px; border: none; background: transparent; color: var(--text-muted); font-size: 22px; line-height: 1; cursor: pointer; border-radius: 8px; display: flex; align-items: center; justify-content: center; }
.modal-close:hover { background: var(--bg); color: var(--text); }
.modal-body { padding: 20px 22px; overflow-y: auto; }
.qr-row { display: flex; gap: 16px; justify-content: center; margin: 16px 0; flex-wrap: wrap; }
.qr-box { text-align: center; }
.qr-box img { width: 160px; height: 160px; border: 1px solid var(--border); border-radius: 10px; background: #fff; }
.qr-box .placeholder { width: 160px; height: 160px; border: 1px dashed var(--border); border-radius: 10px; display: flex; align-items: center; justify-content: center; color: var(--text-muted); font-size: 13px; }

/* 支付结果页 */
.pay-panel { max-width: 480px; margin: 60px auto; text-align: center; }
.pay-amount { font-size: 40px; font-weight: 700; color: var(--primary); margin: 12px 0; }

/* 上传区 */
.upload-zone { border: 2px dashed var(--border); border-radius: 10px; padding: 18px; text-align: center; cursor: pointer; color: var(--text-muted); font-size: 13px; }
.upload-zone:hover { border-color: var(--primary); color: var(--primary); }
.file-thumb { display: flex; gap: 10px; align-items: center; margin-top: 8px; }
.file-thumb img { width: 56px; height: 56px; object-fit: cover; border-radius: 8px; border: 1px solid var(--border); }

/* 编辑表单弹窗 */
.edit-grid { }
.edit-grid .two { display: grid; grid-template-columns: 1fr 1fr; gap: 0 16px; }

/* ================= 响应式：手机 / iPad ================= */

/* ---- 手机（含微信内置浏览器、手机浏览器，≤767px） ---- */
@media (max-width: 767px) {
  .container { padding: 0 16px; }
  /* 顶部导航：菜单可横向滑动，避免换行拥挤 */
  .nav { flex-wrap: nowrap; }
  .nav .logo { font-size: 16px; white-space: nowrap; }
  .nav .menu { gap: 14px; flex: 1; justify-content: flex-end; overflow-x: auto; -webkit-overflow-scrolling: touch; scrollbar-width: none; }
  .nav .menu::-webkit-scrollbar { display: none; }
  .nav .menu a { font-size: 13px; white-space: nowrap; }

  /* 首屏 */
  .hero { padding: 40px 0; }
  .hero h1 { font-size: 22px; }
  .hero p { font-size: 14px; }
  .section { padding: 28px 0; }
  .section-title { font-size: 18px; margin-bottom: 14px; }

  /* 商品网格：手机两列，更紧凑 */
  .grid { grid-template-columns: repeat(2, 1fr); gap: 12px; }
  .product-card .cover { height: 110px; font-size: 36px; }
  .product-card .body { padding: 12px; }
  .product-card .title { font-size: 13px; }
  .product-card .meta { margin-top: 8px; }
  .price { font-size: 15px; }

  /* 分类按钮缩小 */
  .category-chip, .cat-root, .cat-child { font-size: 13px; padding: 5px 12px; }
  .cat-children { max-width: calc(100vw - 32px); }

  /* 按钮 */
  .btn-lg { padding: 10px 22px; font-size: 15px; }

  /* 会员卡 / 详情 / 后台 单列 */
  .vip-cards { grid-template-columns: 1fr; }
  .vip-card { padding: 22px; }
  .detail-grid { grid-template-columns: 1fr; }
  .detail-cover { height: 220px; font-size: 60px; }
  .info-list { grid-template-columns: 1fr; }
  .edit-grid .two { grid-template-columns: 1fr; }

  .admin-layout { flex-direction: column; }
  .admin-sidebar { width: 100%; display: flex; overflow-x: auto; border-right: none; border-bottom: 1px solid var(--border); padding: 10px 0; }
  .admin-sidebar a { white-space: nowrap; }

  /* 弹窗在手机上更贴边 */
  .modal-mask { padding: 12px; }
  .modal-body { padding: 16px; }
  .section-banner { padding: 18px 20px; }
  .auth-box { margin: 30px auto; padding: 22px; }
  .pay-panel { margin: 30px auto; }
  .pay-amount { font-size: 32px; }
}

/* ---- 触屏设备（无 hover）：点父分类展开子分类 ---- */
@media (hover: none) {
  .cat-group > .cat-root { cursor: pointer; }
}

/* ---- iPad / 平板（768px ~ 1024px） ---- */
@media (min-width: 768px) and (max-width: 1024px) {
  .container { padding: 0 24px; }
  .grid { grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); }
  .detail-grid { grid-template-columns: 1fr 1.6fr; }
  .vip-cards { grid-template-columns: repeat(3, 1fr); }
  .admin-sidebar { width: 200px; }
}