/* =========================================================
   MandarinMiles — 读物设计系统 v1.4（Busuu 逻辑）
   基底 #F2F7FD + 品牌蓝 #1166F0 + 单一行动绿 #11EE92
   Hero 全宽紫蓝渐变 / 签名蓝绿渐变 #1166F0→#1C7C70
   作用域：.mm（隔离于 Blocksy，保证新功能扩展空间）
   ========================================================= */

/* 色彩令牌已统一收敛到 style.css 的 :root（单一来源，全局可用）。
   .mm 仅消费 var(--token)，令牌由 :root 继承而来，避免双份漂移。 */
.mm {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.6;
}

.mm * { box-sizing: border-box; }
.mm a { color: var(--primary); text-decoration: none; }
.mm a:hover { text-decoration: underline; }
.mm img { max-width: 100%; display: block; }
.mm .container { max-width: var(--maxw); margin: 0 auto; padding: 0 20px; }
.mm .muted { color: var(--muted); }

/* ---------- 顶部导航 ---------- */
.mm .site-header {
  background: var(--card);
  border-bottom: 1px solid var(--border);
  position: sticky; top: 0; z-index: 50;
}
.mm .nav { display: flex; align-items: center; min-height: var(--mm-header-height, 64px); flex-wrap: wrap; position: relative; }
.mm .brand { font-weight: 800; color: var(--primary); margin-right: 14px; white-space: nowrap; display: inline-flex; align-items: center; gap: 9px; }
.mm .brand:hover { text-decoration: none; }
.mm .brand-mark,
.mm .custom-logo { height: var(--mm-logo-height, 32px); width: auto; max-height: none; display: block; }
.mm .custom-logo-link { display: inline-flex; align-items: center; margin-right: 14px; }
.mm .brand-name { font-size: var(--mm-brand-font-size, 24px); font-weight: 800; letter-spacing: -.01em; line-height: 1; color: var(--primary-dark); white-space: nowrap; }
.mm .brand-name i { font-style: normal; color: var(--primary); }
.mm .nav-links { display: flex; align-items: center; flex: 1; flex-wrap: wrap; }
.mm .nav-links .nav-menu { display: flex; gap: 2px; flex-wrap: wrap; margin: 0 0 0 auto; padding: 0; list-style: none; align-items: center; }
.mm .nav-links .nav-menu li { list-style: none; }
.mm .nav-links a { color: var(--text); padding: 8px 12px; border-radius: 8px; font-size: var(--mm-nav-font-size, 14px); font-weight: 500; }
.mm .nav-links a:hover { background: var(--brand-tint); text-decoration: none; }
.mm .nav-links a.active { color: var(--primary); background: var(--brand-tint); }
.mm .nav-right { display: flex; align-items: center; gap: 8px; }
.mm .nav-auth { display: flex; gap: 8px; align-items: center; }
.mm .nav-login { font-size: var(--mm-nav-font-size, 14px); font-weight: 700; color: var(--text); padding: 8px 6px; }
.mm .nav-login:hover { text-decoration: none; color: var(--primary); }

/* 头部搜索：图标按钮 + 下拉搜索栏（Blocksy 头部构建器不作用于本主题，这里自带实现） */
.mm .nav-search-toggle {
  display: inline-flex; align-items: center; justify-content: center;
  width: 38px; height: 38px; padding: 0; flex: none;
  border: 1px solid var(--border); border-radius: 8px; background: var(--card);
  color: var(--primary-dark); cursor: pointer; transition: .15s;
}
.mm .nav-search-toggle:hover,
.mm .nav-search-toggle[aria-expanded="true"] { background: var(--brand-tint); border-color: var(--primary); color: var(--primary); }
.mm .nav-search-toggle svg { display: block; }
/* display:inline-flex 会盖掉 UA 的 [hidden]，必须显式还原 */
.mm .nav-search-toggle[hidden] { display: none; }

.mm .header-search { background: var(--card); border-top: 1px solid var(--border); }
.mm .header-search[hidden] { display: none; }
.mm .header-search-form { display: flex; align-items: center; gap: 10px; padding: 14px 0 16px; margin: 0; }
.mm .header-search-form input[type="search"] {
  flex: 1; min-width: 0; height: 44px; margin: 0; padding: 0 16px;
  border: 1px solid var(--border); border-radius: 999px;
  background: var(--bg); color: var(--text); font-size: 15px;
}
.mm .header-search-form input[type="search"]::placeholder { color: var(--muted); }
/* 搜索框聚焦：单圈柔和描边，避免与全局 focus-visible 双环叠加 */
.mm .header-search-form input[type="search"]:focus,
.mm .header-search-form input[type="search"]:focus-visible {
  outline: none; border-color: var(--primary);
  box-shadow: 0 0 0 3px rgba(17, 102, 240, .25);
}
.mm .header-search-form .btn { height: 44px; padding: 0 24px; flex: none; }
/* 桌面端：搜索图标与主按钮之间留 6px；图标隐藏时该间距随之消失（[hidden] 不计盒） */
@media (min-width: 881px) {
  .mm .nav-search-toggle { margin-left: 6px; }
}
.mm .screen-reader-text {
  position: absolute !important; width: 1px; height: 1px; padding: 0; margin: -1px;
  overflow: hidden; clip: rect(1px, 1px, 1px, 1px); clip-path: inset(50%);
  white-space: nowrap; border: 0;
}

/* 移动端汉堡按钮 + 折叠容器（桌面：按钮隐藏，容器为正常 flex 子项） */
.mm .nav-tools { display: flex; align-items: center; gap: 8px; flex: none; }
.mm .nav-toggle { display: none; }
/* 折叠容器：margin-left 取代 .nav 的 gap——这样搜索图标被隐藏时
   主按钮仍能贴到内容右边缘（flex gap 会在零宽子项前仍占位） */
.mm .nav-collapse { display: flex; align-items: center; flex: 1; gap: 8px; margin-left: 4px; }

/* ---------- 按钮：行动绿唯一填充，其余描边 ---------- */
.mm .btn {
  display: inline-block; padding: 9px 18px; border-radius: 999px;
  font-size: 14px; font-weight: 600; cursor: pointer; border: 1px solid transparent;
  transition: .15s;
}
.mm .btn-primary { background: var(--action); color: var(--action-ink); font-weight: 700; }
.mm .btn-primary:hover { background: var(--action-hover); text-decoration: none; }
.mm .btn-ghost { border-color: var(--primary); color: var(--primary); background: var(--card); }
.mm .btn-ghost:hover { background: var(--brand-tint); text-decoration: none; }
.mm .btn-white { background: var(--card); color: var(--primary-dark); }
.mm .btn-white:hover { background: var(--brand-tint); text-decoration: none; }
.mm .btn-outline-w { background: transparent; color: #fff; border-color: rgba(255,255,255,.85); }
.mm .btn-outline-w:hover { background: rgba(255,255,255,.14); text-decoration: none; }
.mm .btn:focus-visible,
.mm input:focus-visible,
.mm select:focus-visible { outline: 3px solid rgba(17, 102, 240, .45); outline-offset: 2px; }

/* ---------- 首页 Hero（白底头部下方，全宽紫蓝渐变） ---------- */
.mm .hero { padding: 64px 0 76px; position: relative; overflow: hidden; background: var(--hero-grad); color: #fff; }
.mm .hero-grid { display: grid; grid-template-columns: 1.05fr .95fr; gap: 48px; align-items: center; position: relative; z-index: 1; }
.mm .hero .chip {
  display: inline-block; padding: 6px 14px; border-radius: 999px; font-size: 12px;
  background: rgba(255,255,255,.14); border: 1px solid rgba(255,255,255,.35);
  color: #fff; font-weight: 800; letter-spacing: .12em; margin-bottom: 20px;
}
.mm .hero h1 { font-size: 52px; line-height: 1.08; margin: 0 0 18px; color: #fff; letter-spacing: -.02em; font-weight: 800; }
.mm .hero h1 em { font-style: normal; color: var(--mint); }
.mm .hero p { font-size: 18px; color: rgba(255,255,255,.85); max-width: 520px; margin: 0 0 30px; }
.mm .hero-cta { display: flex; gap: 14px; flex-wrap: wrap; align-items: center; }
.mm .hero-cta .btn { padding: 13px 28px; font-size: 15.5px; font-weight: 800; }
.mm .hero-trust { display: flex; align-items: center; gap: 10px; margin-top: 28px; font-size: 13.5px; color: rgba(255,255,255,.8); }
.mm .hero-trust .stars { color: #FFC94D; letter-spacing: 2px; font-size: 14px; }

/* Hero 封面卡视觉 */
.mm .hero-visual { position: relative; height: 400px; }
.mm .hcover {
  border-radius: 14px; position: absolute; display: flex; flex-direction: column;
  justify-content: space-between; padding: 16px; color: #fff; overflow: hidden;
  box-shadow: 0 16px 40px rgba(11,20,50,.35); border: 1.5px solid rgba(255,255,255,.35);
}
.mm .hcover .hz { font-size: 44px; font-weight: 800; line-height: 1; opacity: .95; }
.mm .hcover .lb { font-size: 11.5px; font-weight: 700; opacity: .92; letter-spacing: .04em; }
.mm .hcover .free-tag { position: absolute; top: 10px; right: 10px; background: var(--card); color: var(--accent-strong); font-size: 10px; font-weight: 800; padding: 3px 8px; border-radius: 999px; letter-spacing: .06em; }
.mm .hcv1 { left: 6%; top: 8%; width: 184px; height: 246px; background: linear-gradient(150deg, var(--primary), #5B97F9); transform: rotate(-5deg); }
.mm .hcv2 { left: 32%; top: 24%; width: 184px; height: 246px; background: linear-gradient(150deg, var(--accent), #4CC6BA); transform: rotate(3deg); }
.mm .hcv3 { left: 58%; top: 4%; width: 184px; height: 246px; background: linear-gradient(150deg, #3D5AF1, #6C8BFF); transform: rotate(7deg); }
.mm .hero-float {
  position: absolute; right: 0; bottom: 4%; background: var(--card); border: 1px solid var(--border);
  border-radius: 14px; box-shadow: 0 12px 30px rgba(11,20,50,.25); padding: 12px 16px;
  font-size: 13px; font-weight: 700; color: var(--text); display: flex; align-items: center; gap: 9px;
}
.mm .hero-float i { width: 22px; height: 22px; border-radius: 50%; background: var(--accent-strong); color: #fff; font-size: 12px; font-style: normal; display: flex; align-items: center; justify-content: center; }

/* ---------- 区块通用 ---------- */
.mm .section { padding: 56px 0; }
.mm .section.on-base { background: var(--bg); }
.mm .section-title { font-size: 26px; font-weight: 800; margin: 0 0 6px; color: var(--primary-dark); }
.mm .section-sub { color: var(--muted); margin: 0 0 28px; }
.mm .sec-k { font-size: 12px; font-weight: 800; letter-spacing: .14em; margin-bottom: 10px; color: var(--primary); }
.mm .sec-k.t { color: var(--accent-strong); }

/* ---------- 数据条 ---------- */
.mm .stat-band { background: var(--bg); padding: 34px 0; }
.mm .stat-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; }
.mm .stat { background: var(--card); border: 1px solid var(--border); border-radius: 16px; padding: 22px 24px; box-shadow: var(--shadow); }
.mm .stat b { display: block; font-size: 32px; font-weight: 800; letter-spacing: -.02em; color: var(--primary); }
.mm .stat b.t { color: var(--accent-strong); }
.mm .stat span { font-size: 13.5px; color: var(--muted); }

/* ---------- 栏目大卡 ---------- */
.mm .tcards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.mm .tcard { background: var(--card); border: 1px solid var(--border); border-radius: 16px; overflow: hidden; box-shadow: var(--shadow); display: flex; flex-direction: column; transition: transform .15s; }
.mm .tcard:hover { transform: translateY(-3px); }
.mm .tcard .art { height: 150px; position: relative; display: flex; align-items: center; justify-content: center; }
.mm .tcard .art .big { font-size: 64px; font-weight: 800; color: #fff; opacity: .95; }
.mm .tcard .art .ring { position: absolute; width: 110px; height: 110px; border: 2px dashed rgba(255,255,255,.5); border-radius: 50%; }
.mm .tcard .bd { padding: 22px 24px 24px; display: flex; flex-direction: column; gap: 12px; flex: 1; }
.mm .tcard h3 { margin: 0; font-size: 20px; font-weight: 800; color: var(--primary-dark); }
.mm .tcard p { font-size: 14px; color: var(--muted); margin: 0; }
.mm .tcard .go { margin-top: auto; font-size: 14px; font-weight: 700; color: var(--primary); }
.mm .tcard .go.t { color: var(--accent-strong); }

/* ---------- 价值四卡 ---------- */
.mm .vcards { display: grid; grid-template-columns: repeat(4, 1fr); gap: 20px; }
.mm .vcard { background: var(--card); border: 1px solid var(--border); border-radius: 16px; padding: 26px 24px; box-shadow: var(--shadow); }
.mm .vcard .ic { width: 46px; height: 46px; border-radius: 12px; display: flex; align-items: center; justify-content: center; font-size: 21px; font-weight: 800; color: #fff; margin-bottom: 16px; }
.mm .vcard h4 { margin: 0 0 8px; font-size: 16.5px; font-weight: 800; color: var(--primary-dark); }
.mm .vcard p { font-size: 13.5px; color: var(--muted); margin: 0; }

/* ---------- 免费读物横卡 ---------- */
.mm .fitems { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.mm .fitem { background: var(--card); border: 1px solid var(--border); border-radius: 16px; padding: 18px; display: flex; gap: 16px; align-items: center; box-shadow: var(--shadow); }
.mm .fitem .mini { flex: none; width: 64px; height: 84px; border-radius: 10px; display: flex; align-items: center; justify-content: center; font-size: 24px; font-weight: 800; color: #fff; }
.mm .fitem b { display: block; font-size: 15.5px; color: var(--primary-dark); }
.mm .fitem .meta { font-size: 12.5px; color: var(--muted); display: block; margin: 2px 0 8px; }
.mm .fitem .fb { font-size: 11px; font-weight: 800; color: #fff; background: var(--accent-strong); border-radius: 999px; padding: 2px 9px; letter-spacing: .05em; }
.mm .fitem .go { font-size: 13px; font-weight: 700; color: var(--primary); margin-left: 8px; }
.mm .mail-note { margin-top: 22px; background: var(--teal-tint); border: 1px solid #CBE7E1; border-radius: 12px; padding: 14px 18px; font-size: 13.5px; color: var(--accent-strong); display: flex; align-items: center; gap: 12px; flex-wrap: wrap; }

/* ---------- 套餐卡 ---------- */
.mm .bcards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.mm .bcard2 { background: var(--card); border: 1px solid var(--border); border-radius: 16px; padding: 28px 26px; display: flex; flex-direction: column; gap: 14px; box-shadow: var(--shadow); position: relative; }
.mm .bcard2.pop { border: 2px solid var(--primary); }
.mm .bcard2 .tagp { position: absolute; top: -13px; left: 50%; transform: translateX(-50%); background: var(--primary); color: #fff; font-size: 11.5px; font-weight: 800; padding: 4px 14px; border-radius: 999px; letter-spacing: .06em; white-space: nowrap; }
.mm .bcard2 h4 { margin: 0; font-size: 17px; font-weight: 800; color: var(--primary-dark); }
.mm .bcard2 .price { font-size: 38px; font-weight: 800; color: var(--primary); letter-spacing: -.02em; }
.mm .bcard2 .price small { font-size: 14px; font-weight: 600; color: var(--muted); }
.mm .bcard2 ul { list-style: none; padding: 0; margin: 0; display: flex; flex-direction: column; gap: 9px; font-size: 14px; color: var(--muted); }
.mm .bcard2 li { display: flex; gap: 9px; align-items: flex-start; }
.mm .bcard2 li::before { content: ""; flex: none; width: 16px; height: 16px; border-radius: 50%; background: var(--brand-tint); margin-top: 3px; }
.mm .bcard2 .bb { margin-top: auto; }
.mm .bcard2 .bb .btn { width: 100%; }

/* ---------- 工具格 ---------- */
.mm .tooltiles { display: grid; grid-template-columns: repeat(6, 1fr); gap: 16px; }
.mm .tooltile { background: var(--card); border: 1px solid var(--border); border-radius: 16px; padding: 22px 14px; text-align: center; box-shadow: var(--shadow); }
.mm .tooltile .ic { width: 44px; height: 44px; border-radius: 12px; margin: 0 auto 12px; display: flex; align-items: center; justify-content: center; font-size: 20px; font-weight: 800; color: #fff; }
.mm .tooltile b { display: block; font-size: 14px; color: var(--primary-dark); }
.mm .tooltile span { font-size: 12px; color: var(--muted); }

/* ---------- CTA 横幅（蓝绿签名渐变） ---------- */
.mm .cta-grad { border-radius: 22px; padding: 56px 40px; text-align: center; color: #fff; position: relative; overflow: hidden; background: var(--bg-grad); }
.mm .cta-grad h2 { font-size: 36px; font-weight: 800; letter-spacing: -.015em; margin: 0; color: #fff; }
.mm .cta-grad p { font-size: 16px; opacity: .88; margin: 10px 0 26px; }
.mm .cta-grad .btn-w { background: var(--card); color: var(--primary); padding: 13px 30px; font-size: 15.5px; font-weight: 800; }

/* ---------- 标题区两栏 ---------- */
.mm .page-head-grid { display: grid; grid-template-columns: 1.25fr 1fr; gap: 40px; align-items: center; }
.mm .page-head-intro .breadcrumb { margin-bottom: 6px; }
.mm .breadcrumb { font-size: 13px; color: var(--muted); margin-bottom: 6px; }
.mm .breadcrumb a { color: var(--muted); }

/* ---------- 通用 chip（蓝底默认 / 青绿变体） ---------- */
.mm .chip { display: inline-block; padding: 5px 12px; border-radius: 999px; font-size: 13px; background: var(--brand-tint); color: var(--primary); font-weight: 600; }
.mm .chip:hover { background: #D8E7FD; text-decoration: none; }
.mm .chip-teal { background: var(--teal-tint); color: var(--accent-strong); }
.mm .chip-teal:hover { background: #D3EDE8; }

/* ---------- 列表页布局 ---------- */
.mm .layout { display: grid; grid-template-columns: 260px 1fr; gap: 28px; align-items: start; }
.mm .page-head { padding: 36px 0 8px; }

/* grade 二级导航 */
.mm .subnav { display: flex; gap: 8px; flex-wrap: wrap; margin: 14px 0 22px; }
.mm .subnav a { padding: 7px 14px; border: 1px solid var(--border); border-radius: 999px; font-size: 13px; color: var(--text); background: var(--card); }
.mm .subnav a:hover { border-color: var(--primary); text-decoration: none; }
.mm .subnav a.active { background: var(--primary); color: #fff; border-color: var(--primary); }

/* 筛选侧栏 */
.mm .filters { background: var(--card); border: 1px solid var(--border); border-radius: var(--radius); padding: 18px; position: sticky; top: calc(var(--mm-header-height, 64px) + 20px); }
.mm .filters h4 { font-size: 14px; margin: 0 0 14px; text-transform: uppercase; letter-spacing: .04em; color: var(--muted); }
.mm .filter-group { margin-bottom: 18px; }
.mm .filter-group > .label { font-weight: 700; font-size: 13px; display: block; margin-bottom: 8px; color: var(--primary-dark); }
.mm .filter-group label.opt { display: flex; align-items: center; gap: 8px; font-size: 13px; color: var(--text); margin: 5px 0; cursor: pointer; }
.mm .filter-group input[type=checkbox], .mm .filter-group input[type=radio] { accent-color: var(--accent); }

/* 列表区 */
.mm .results-bar { display: flex; justify-content: space-between; align-items: center; margin-bottom: 16px; flex-wrap: wrap; gap: 10px; }
.mm .results-bar .count { color: var(--muted); font-size: 14px; }

.mm .book-grid { display: grid; grid-template-columns: repeat(2, 1fr); gap: 18px; }
.mm .book { background: var(--card); border: 1px solid var(--border); border-radius: var(--radius); padding: 18px; box-shadow: var(--shadow); display: flex; flex-direction: column; gap: 10px; transition: .15s; }
.mm .book:hover { border-color: var(--primary); box-shadow: 0 4px 14px rgba(17, 102, 240, .10); }
.mm .book .cover { width: 100%; height: 120px; border-radius: 8px; background: linear-gradient(135deg, #DCE9FD, #B9D2F7); }
.mm .book h3 { margin: 0; font-size: 17px; color: var(--primary-dark); }
.mm .book .cn { color: var(--muted); font-size: 14px; }
.mm .book .meta { display: flex; flex-wrap: wrap; gap: 6px; }
.mm .book .chip { font-size: 11px; background: var(--bg); border: 1px solid var(--border); color: var(--muted); padding: 3px 8px; border-radius: 6px; }
.mm .book .price { font-weight: 700; color: var(--primary); }
.mm .book .price.free { color: var(--accent-strong); }
.mm .book .row { display: flex; justify-content: space-between; align-items: center; margin-top: auto; }

/* ---------- 详情页 ---------- */
.mm .reading-hero { background: var(--card); border-bottom: 1px solid var(--border); padding: 36px 0; }
.mm .reading-hero h1 { margin: 0 0 10px; font-size: 32px; color: var(--primary-dark); }
.mm .reading-meta { display: flex; flex-wrap: wrap; gap: 8px; margin-bottom: 14px; }
.mm .reading-meta .chip { font-size: 12px; background: var(--bg); border: 1px solid var(--border); color: var(--muted); padding: 4px 10px; border-radius: 999px; }
.mm .reading-body { display: grid; grid-template-columns: 1fr 320px; gap: 32px; align-items: start; }
.mm .prose { background: var(--card); border: 1px solid var(--border); border-radius: var(--radius); padding: 28px; font-size: 17px; line-height: 2; }
.mm .prose h2 { font-size: 20px; margin-top: 0; color: var(--primary-dark); }
.mm .mm-sentence { margin-bottom: 14px; }
.mm .mm-sentence .hanzi { font-size: 19px; color: var(--text); }
.mm .mm-sentence .pinyin { color: var(--accent-strong); font-size: 13px; display: block; }
.mm .sidebar-box { background: var(--card); border: 1px solid var(--border); border-radius: var(--radius); padding: 20px; position: sticky; top: calc(var(--mm-header-height, 64px) + 20px); margin-bottom: 16px; }
.mm .sidebar-box h4 { margin: 0 0 12px; color: var(--primary-dark); }
.mm .vocab { font-size: 14px; padding-left: 18px; margin: 0; }
.mm .vocab li { margin-bottom: 8px; }
.mm .buy-box { border: 2px solid var(--accent); border-radius: var(--radius); padding: 20px; text-align: center; margin-bottom: 16px; background: var(--card); }
.mm .buy-box .price { font-size: 28px; font-weight: 800; color: var(--primary); }
.mm .buy-box s { color: var(--muted); font-weight: 400; margin-left: 6px; }

/* ---------- 博客 ---------- */
.mm .post-list { display: grid; gap: 16px; }
.mm .post { background: var(--card); border: 1px solid var(--border); border-radius: var(--radius); padding: 22px; box-shadow: var(--shadow); }
.mm .post h3 { margin: 0 0 6px; color: var(--primary-dark); }
.mm .post .date { font-size: 13px; color: var(--muted); }

.mm .blog-layout { display: grid; grid-template-columns: 1fr 320px; gap: 40px; align-items: start; }
.mm .post-row { display: flex; gap: 18px; padding: 22px 0; border-bottom: 1px solid var(--border); }
.mm .post-thumb { width: 200px; height: 120px; border-radius: 8px; flex: 0 0 auto; background: linear-gradient(135deg, #DCE9FD, #B9D2F7); }
.mm .post-main { flex: 1; min-width: 0; }
.mm .post-meta { font-size: 12px; letter-spacing: .04em; color: var(--muted); text-transform: uppercase; margin-bottom: 6px; }
.mm .post-row h3 { margin: 0 0 8px; font-size: 19px; color: var(--primary-dark); }
.mm .post-row p { color: var(--muted); margin: 0; font-size: 14px; }

.mm .blog-side { position: sticky; top: calc(var(--mm-header-height, 64px) + 20px); }
.mm .side-search { display: flex; gap: 8px; margin-bottom: 24px; }
.mm .side-search input { flex: 1; padding: 10px 12px; border: 1px solid var(--border); border-radius: 8px; font-size: 13px; outline: none; }
.mm .side-search input:focus { border-color: var(--primary); }
.mm .side-search button { padding: 10px 16px; font-size: 13px; }
.mm .side-title { font-size: 14px; text-transform: uppercase; letter-spacing: .05em; color: var(--muted); margin: 0 0 14px; }
.mm .promo-card { position: relative; height: 168px; border-radius: 10px; overflow: hidden; margin-bottom: 16px; display: flex; align-items: center; justify-content: center; text-align: center; background: var(--bg-grad); color: #fff; }
.mm .promo-card .promo-overlay { position: absolute; inset: 0; background: rgba(15, 23, 42, .25); }
.mm .promo-card .promo-inner { position: relative; padding: 16px; }
.mm .promo-card h4 { color: #fff; font-size: 15px; line-height: 1.4; margin: 0 0 8px; }

/* ---------- 工具卡片 ---------- */
.mm .tool-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 18px; }

/* ---------- 旧版首页组件（兼容保留） ---------- */
.mm .cards { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.mm .card { background: var(--card); border: 1px solid var(--border); border-radius: var(--radius); padding: 24px; box-shadow: var(--shadow); }
.mm .card h3 { margin: 0 0 8px; font-size: 19px; color: var(--primary-dark); }
.mm .card p { color: var(--muted); font-size: 14px; margin: 0 0 14px; }
.mm .card .tag { display: inline-block; font-size: 12px; background: var(--brand-tint); color: var(--primary); padding: 3px 10px; border-radius: 999px; margin: 0 6px 6px 0; }
.mm .value-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.mm .value-item { background: var(--card); border: 1px solid var(--border); border-radius: var(--radius); padding: 22px; }
.mm .value-item h4 { margin: 0 0 6px; color: var(--primary-dark); }
.mm .value-item p { color: var(--muted); font-size: 14px; margin: 0; }
.mm .banner { background: var(--teal-tint); border: 1px solid #CBE7E1; border-radius: var(--radius); padding: 28px; display: flex; align-items: center; justify-content: space-between; gap: 20px; flex-wrap: wrap; }
.mm .banner h3 { margin: 0 0 6px; color: var(--primary-dark); }
.mm .banner p { margin: 0; color: var(--accent-strong); }
.mm .sample-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 20px; }
.mm .rcard { display: block; background: var(--card); border: 1px solid var(--border); border-radius: var(--radius); overflow: hidden; box-shadow: var(--shadow); color: inherit; }
.mm .rcard:hover { text-decoration: none; box-shadow: 0 4px 12px rgba(17, 102, 240, .16); border-color: var(--primary); }
.mm .rcard-cover { height: 150px; background: linear-gradient(135deg, #DCE9FD, #B9D2F7); }
.mm .rcard-body { padding: 16px; }
.mm .rcard-tag { display: inline-flex; align-items: center; gap: 6px; font-size: 12px; font-weight: 600; color: var(--accent-strong); margin-bottom: 8px; }
.mm .rcard h3 { margin: 0 0 2px; font-size: 17px; color: var(--primary-dark); }
.mm .rcard .cn { color: var(--muted); font-size: 14px; }
.mm .bundle-pills { display: flex; gap: 8px; flex-wrap: wrap; margin-bottom: 22px; }
.mm .bundle-pills a { padding: 7px 16px; border-radius: 999px; font-size: 13px; border: 1px solid var(--border); background: var(--card); color: var(--text); }
.mm .bundle-pills a:hover { text-decoration: none; border-color: var(--primary); }
.mm .bundle-pills a.active { background: var(--primary); color: #fff; border-color: var(--primary); }
.mm .bcard { background: var(--card); border: 1px solid var(--border); border-radius: var(--radius); overflow: hidden; box-shadow: var(--shadow); display: flex; flex-direction: column; }
.mm .bcard-accent { height: 6px; background: var(--bg-grad); }
.mm .bcard-cover { margin: 14px; border-radius: 8px; height: 130px; background: linear-gradient(135deg, #DCE9FD, #B9D2F7); }
.mm .bcard-body { padding: 0 16px 16px; display: flex; flex-direction: column; gap: 8px; flex: 1; }
.mm .bcard-tag { align-self: flex-start; font-size: 11px; background: var(--teal-tint); color: var(--accent-strong); padding: 3px 10px; border-radius: 999px; }
.mm .bcard h3 { margin: 0; font-size: 17px; color: var(--primary-dark); }
.mm .bcard-hl { background: var(--brand-tint); border-radius: 8px; padding: 12px; font-size: 13px; color: var(--primary); }
.mm .bcard .row { display: flex; justify-content: space-between; align-items: center; margin-top: auto; }
.mm .bcard .price { font-weight: 700; color: var(--primary); }
.mm .bcard .price s { color: var(--muted); font-weight: 400; margin-left: 6px; }

/* ---------- 页脚（浅底 + 浅底版 Logo） ---------- */
.mm .site-footer { background: var(--bg); color: var(--muted); border-top: 1px solid var(--border); padding: 44px 0 26px; margin-top: 0; }
.mm .site-footer a { color: var(--muted); }
.mm .site-footer a:hover { color: var(--primary); }
.mm .site-footer .cols { display: grid; grid-template-columns: 1.4fr 1fr 1fr 1fr; gap: 24px; }
.mm .site-footer h5 { color: var(--primary-dark); margin: 0 0 12px; font-size: 12px; letter-spacing: .1em; text-transform: uppercase; }
.mm .site-footer .brand-logo { height: 30px; width: auto; margin-bottom: 12px; }
.mm .site-footer .brand-mark-solo { height: 40px; width: auto; display: block; }
.mm .site-footer .brand p { white-space: normal; color: var(--muted); font-weight: 400; font-size: 13.5px; line-height: 1.55; max-width: 260px; margin: 14px 0 0; }
.mm .site-footer ul { list-style: none; padding: 0; margin: 0; font-size: 14px; }
.mm .site-footer li { margin: 6px 0; }
.mm .site-footer .copy { margin-top: 24px; font-size: 13px; color: var(--muted); border-top: 1px solid var(--border); padding-top: 18px; }

/* ---------- 导航二级下拉（栏目设置 2.0） ---------- */
.mm .nav-links .nav-menu li { position: relative; }
.mm .nav-links .sub-menu {
  display: none; position: absolute; top: 100%; left: 0; z-index: 60;
  min-width: 210px; background: var(--card); border: 1px solid var(--border);
  border-radius: 12px; box-shadow: 0 14px 34px rgba(27,42,74,.14);
  padding: 8px; margin: 4px 0 0; list-style: none; flex-direction: column; gap: 2px;
}
.mm .nav-links li:hover > .sub-menu,
.mm .nav-links li:focus-within > .sub-menu { display: flex; }
.mm .nav-links .sub-menu a { display: block; padding: 8px 12px; font-size: 13.5px; font-weight: 500; white-space: nowrap; color: var(--text); }
.mm .nav-links .sub-menu a:hover { background: var(--brand-tint); color: var(--primary); text-decoration: none; }

/* ---------- Free Reads：每周更新徽标 + 本周特位 ---------- */
.mm .week-badge {
  display: inline-block; vertical-align: middle; margin-left: 12px; font-size: 11px;
  font-weight: 800; letter-spacing: .1em; color: #fff; background: var(--accent-strong);
  border-radius: 999px; padding: 4px 12px; transform: translateY(-3px);
}
.mm .week-feature {
  display: flex; align-items: center; gap: 24px; flex-wrap: wrap;
  background: var(--teal-tint); border: 1px solid #CBE7E1; border-radius: 18px;
  padding: 24px 28px; margin-bottom: 28px;
}
.mm .week-feature .week-tag {
  flex: none; font-size: 11px; font-weight: 800; letter-spacing: .12em;
  color: var(--accent-strong); background: var(--card); border: 1px solid #CBE7E1;
  border-radius: 999px; padding: 6px 14px;
}
.mm .week-feature .week-body { flex: 1; min-width: 220px; }
.mm .week-feature h3 { margin: 0 0 4px; font-size: 20px; }
.mm .week-feature h3 a { color: var(--primary-dark); }
.mm .week-feature p { margin: 0 0 8px; font-size: 14px; color: var(--muted); }
.mm .week-feature .meta { display: flex; gap: 6px; flex-wrap: wrap; }
.mm .week-feature .meta .chip { font-size: 11px; background: var(--card); border: 1px solid #CBE7E1; color: var(--accent-strong); padding: 2px 9px; }

/* ---------- Advanced filters（默认折叠） ---------- */
.mm .adv-filters { margin-top: 4px; border-top: 1px dashed var(--border); padding-top: 10px; }
.mm .adv-filters summary {
  cursor: pointer; font-size: 12px; font-weight: 800; letter-spacing: .08em;
  text-transform: uppercase; color: var(--muted); padding: 6px 0; list-style: none;
}
.mm .adv-filters summary::-webkit-details-marker { display: none; }
.mm .adv-filters summary::before { content: "＋ "; color: var(--primary); font-weight: 800; }
.mm .adv-filters[open] summary::before { content: "－ "; }
.mm .adv-filters .filter-group:first-of-type { margin-top: 10px; }

/* ---------- 详情页：Level + HSK 参考行 / 操作按钮 ---------- */
.mm .level-line { display: flex; gap: 10px; flex-wrap: wrap; margin: 0 0 14px; }
.mm .level-line .lv {
  font-size: 13px; font-weight: 800; color: var(--primary);
  background: var(--brand-tint); border-radius: 999px; padding: 5px 14px;
}
.mm .level-line .hsk {
  font-size: 13px; font-weight: 700; color: var(--accent-strong);
  background: var(--teal-tint); border-radius: 999px; padding: 5px 14px;
}
.mm .mm-actions { display: flex; gap: 10px; flex-wrap: wrap; margin-bottom: 16px; }
.mm .mm-actions .btn { flex: 1; min-width: 140px; text-align: center; font-size: 13px; padding: 9px 12px; }

/* ---------- 响应式 ---------- */
@media (max-width: 880px) {
  .mm .cards, .mm .value-grid, .mm .tool-grid, .mm .sample-grid,
  .mm .tcards, .mm .vcards, .mm .fitems, .mm .bcards, .mm .tooltiles { grid-template-columns: 1fr; }
  .mm .stat-grid { grid-template-columns: 1fr 1fr; }
  .mm .layout { grid-template-columns: 1fr; }
  .mm .filters { position: static; }
  .mm .book-grid { grid-template-columns: 1fr; }
  .mm .reading-body { grid-template-columns: 1fr; }
  .mm .site-footer .cols { grid-template-columns: 1fr 1fr; }
  .mm .hero h1 { font-size: 34px; }
  .mm .hero-grid { grid-template-columns: 1fr; gap: 28px; }
  .mm .hero-visual { height: 300px; }
  .mm .page-head-grid { grid-template-columns: 1fr; gap: 24px; }
  .mm .blog-layout { grid-template-columns: 1fr; }
  .mm .blog-side { position: static; }
  .mm .post-thumb { width: 140px; height: 90px; }
  /* 移动端子菜单的展开逻辑见文件末尾 @media(max-width:880px) 块 */
  .mm .week-feature { flex-direction: column; align-items: flex-start; }
}

/* ---------- 移动端导航（≤880px）：汉堡菜单 + 下拉折叠面板 ---------- */
@media (max-width: 880px) {
  .mm .nav { flex-wrap: nowrap; }
  .mm .nav-tools { margin-left: auto; }
  .mm .nav-toggle {
    display: inline-flex; align-items: center; justify-content: center;
    width: 42px; height: 42px; margin-left: 0;
    border: 1px solid var(--border); border-radius: 8px; background: var(--card);
    color: var(--primary); font-size: 20px; line-height: 1; cursor: pointer;
  }
  .mm .nav-collapse {
    display: none; position: absolute; top: 100%; left: 0; right: 0;
    flex-direction: column; align-items: stretch; gap: 4px;
    background: var(--card); border-bottom: 1px solid var(--border);
    box-shadow: var(--shadow); padding: 12px 20px; z-index: 60;
  }
  .mm .nav-collapse.open { display: flex; }
  .mm .nav-links { flex: none; display: block; }
  .mm .nav-links .nav-menu { flex-direction: column; margin: 0; gap: 0; width: 100%; }
  .mm .nav-links .nav-menu li { width: 100%; }
  .mm .nav-links a { display: block; padding: 11px 8px; font-size: calc(var(--mm-nav-font-size, 14px) + 1px); }
  .mm .nav-right { width: 100%; }
  .mm .nav-auth { width: 100%; gap: 10px; }
  .mm .nav-login { flex: 1; text-align: center; padding: 10px 6px; }
  .mm .nav-auth .btn { flex: 1; text-align: center; }
  /* 移动端子菜单：静态展开（点父级链接切换 li.open） */
  .mm .nav-links .sub-menu {
    display: none; position: static; box-shadow: none; border: none;
    min-width: 0; padding: 0 0 0 14px; margin: 0; background: var(--bg);
  }
  .mm .nav-links li.open > .sub-menu { display: flex; }
}