.learn-page {
  background: var(--o-bg-light);
  font-family: var(--o-font-body);
  color: var(--o-ink);
  min-height: 100vh;
}

.learn-page__inner {
  padding-top: 20px;
  padding-bottom: 48px;
}

.learn-page__title {
  margin: 0 0 20px;
  font-size: 30px;
  font-weight: 800;
  line-height: 1.2;
  color: var(--o-ink);
  display: none;
}
@media (max-width: 767px) {
  .learn-page__title {
    font-size: 24px;
    margin-bottom: 16px;
  }
}


.learn-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 24px;
}
@media (min-width: 992px) {
  .learn-grid {
    grid-template-columns: minmax(0, 1fr) 320px;
    gap: 32px;
  }
}


.learn-cards {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px;
}
@media (min-width: 768px) {
  .learn-cards {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 20px;
  }
}


.learn-card {
  display: flex;
  flex-direction: column;
  background: var(--o-card);
  border: none;
  border-radius: var(--o-radius-sm);
  box-shadow: var(--o-shadow);
  overflow: hidden;
  transition: transform .25s ease, box-shadow .25s ease;
  will-change: transform;
}
.learn-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--o-shadow-hover);
}
.learn-card:active {
  transform: scale(.98);
}


.learn-card__img {
  display: block;
  width: 100%;
  overflow: hidden;
  aspect-ratio: 16 / 9;
  background: var(--o-line-soft);
}
.learn-card__img img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform .45s ease;
}
.learn-card:hover .learn-card__img img {
  transform: scale(1.06);
}


.learn-card__content {
  padding: 16px 18px 18px;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 8px;
}
.learn-card__category {
  display: inline-block;
  font-size: 12px;
  font-weight: 600;
  color: var(--o-accent);
  letter-spacing: .02em;
  text-transform: uppercase;
}
.learn-card__category:hover {
  color: var(--o-ink-2);
}
.learn-card__title {
  margin: 0;
  line-height: 1.3;
}
.learn-card__title a {
  font-size: 17px;
  font-weight: 700;
  color: var(--o-ink);
  text-decoration: none;
}
.learn-card__title a:hover {
  color: var(--o-accent);
}
.learn-card__excerpt {
  margin: 4px 0 0;
  font-size: 13px;
  line-height: 1.5;
  color: var(--o-ink-2);
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.learn-card__cta {
  margin-top: auto;
  padding-top: 4px;
}
.learn-card__cta-link {
  display: inline-block;
  font-size: 13px;
  font-weight: 600;
  color: var(--o-accent);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color .2s ease;
}
.learn-card__cta-link:hover {
  border-bottom-color: var(--o-accent);
}


.learn-aside {
  display: flex;
  flex-direction: column;
  gap: 20px;
}
.learn-widget {
  background: var(--o-card);
  border: none;
  border-radius: var(--o-radius-sm);
  box-shadow: var(--o-shadow);
  padding: 20px;
}
.learn-widget__title {
  margin: 0 0 14px;
  font-size: 15px;
  font-weight: 700;
  color: var(--o-ink);
}


.learn-feed-item {
  display: flex;
  gap: 12px;
  align-items: flex-start;
  padding: 12px 0;
  border-bottom: 1px solid var(--o-line);
}
.learn-feed-item:first-child { padding-top: 0; }
.learn-feed-item:last-child {
  border-bottom: none;
  padding-bottom: 0;
}
.learn-feed-item__img {
  display: block;
  flex: 0 0 80px;
  width: 80px;
  height: 58px;
  border-radius: var(--o-radius-tag);
  overflow: hidden;
}
.learn-feed-item__img img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.learn-feed-item__title {
  margin: 0 0 4px;
  font-size: 13px;
  line-height: 1.4;
}
.learn-feed-item__title a {
  color: var(--o-ink);
  text-decoration: none;
}
.learn-feed-item__title a:hover {
  color: var(--o-accent);
}
.learn-feed-item__meta {
  font-size: 12px;
  color: var(--o-ink-3);
}


.learn-category {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 0;
  border-bottom: 1px solid var(--o-line);
}
.learn-category:last-child {
  border-bottom: none;
  padding-bottom: 0;
}
.learn-category:first-child { padding-top: 0; }
.learn-category a {
  font-size: 13px;
  font-weight: 500;
  color: var(--o-ink-2);
  text-decoration: none;
}
.learn-category a:hover {
  color: var(--o-accent);
}


.learn-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}
.learn-tags a {
  display: inline-block;
  padding: 6px 12px;
  font-size: 12px;
  font-weight: 500;
  color: var(--o-ink-2);
  background: var(--o-line-soft);
  border-radius: var(--o-radius-tag);
  text-decoration: none;
  transition: background-color .2s ease, color .2s ease;
}
.learn-tags a:hover {
  background: var(--o-accent);
  color: #fff;
}


.learn-category a.is-active {
  color: var(--o-accent);
  font-weight: 600;
}
.learn-tags a.is-active {
  background: var(--o-accent);
  color: #fff;
}
.learn-nav-item.is-active {
  color: var(--o-accent);
  font-weight: 600;
}
.learn-nav-tag.is-active {
  background: var(--o-accent);
  color: #fff;
}



.learn-active-filters {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin-bottom: 12px;
}
.learn-active-filter {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  height: 32px;
  padding: 0 6px 0 12px;
  background: var(--o-card);
  border: none;
  border-radius: 999px;
  font: 500 13px var(--o-font-display);
  color: var(--o-ink-2);
  box-shadow: var(--o-shadow);
}
.learn-active-filter__label,
.learn-active-filter__value {
  line-height: 1;
}
.learn-active-filter__label {
  color: var(--o-ink-3);
  white-space: nowrap;
}
.learn-active-filter__value {
  color: var(--o-ink-2);
  font-weight: 600;
  white-space: nowrap;
}
.learn-active-filter__clear {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 22px;
  height: 22px;
  margin-left: 2px;
  border: none;
  border-radius: 50%;
  background: transparent;
  color: var(--o-ink-3);
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
  transition: background-color .15s ease, color .15s ease;
}
.learn-active-filter__clear:hover {
  background: var(--o-accent-soft);
  color: var(--o-accent);
}
.learn-active-filter__clear:active {
  transform: scale(.92);
}
.learn-active-filter__clear svg {
  width: 14px;
  height: 14px;
}


.learn-pager {
  display: flex;
  justify-content: center;
  margin-top: 32px;
}
.learn-pager ul {
  display: flex;
  align-items: center;
  gap: 8px;
  list-style: none;
  margin: 0;
  padding: 0;
}
.learn-pager li {
  display: flex;
  align-items: center;
}
.learn-pager a,
.learn-pager button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 40px;
  height: 40px;
  padding: 0 10px;
  border-radius: var(--o-radius-sm);
  border: 1px solid var(--o-line);
  background: var(--o-card);
  color: var(--o-ink);
  font-family: inherit;
  font-size: 14px;
  text-decoration: none;
  cursor: pointer;
  transition: color .15s ease, border-color .15s ease, background-color .15s ease;
}
.learn-pager a:hover,
.learn-pager button:hover {
  border-color: var(--o-accent);
  color: var(--o-accent);
}
.learn-pager li.active a,
.learn-pager li.active button {
  background: var(--o-accent);
  border-color: var(--o-accent);
  color: #fff;
  box-shadow: 0 4px 12px rgba(45, 150, 222, .25);
}
.learn-pager a svg,
.learn-pager button svg {
  width: 18px;
  height: 18px;
  display: block;
  flex: none;
}
.learn-pager li.learn-pager__ellipsis {
  min-width: 40px;
  height: 40px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: none;
  background: transparent;
  color: var(--o-ink-3);
  font-size: 14px;
  letter-spacing: .05em;
  cursor: default;
}


.learn-empty {
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
  min-height: 300px;
  background: var(--o-card);
  border-radius: var(--o-radius-sm);
  box-shadow: var(--o-shadow);
  padding: 32px;
  grid-column: 1 / -1;
}
.learn-empty h3 {
  font: 600 18px var(--o-font-display);
  color: var(--o-ink-2);
  margin: 0;
}


@media (max-width: 991px) {
  
  .learn-page__inner {
    padding-top: 14px;
    /* 底部预留：FAB 栈最高档位（+140 + 44）留出可视余量，最后一张卡不被悬浮按钮压住 */
    padding-bottom: calc(var(--o-bottomnav-h) + 100px);
  }
  
  .learn-aside {
    display: none;
  }

  /* 移动端：分类 / 标签 抽屉（方案 B，对齐产品列表 cr-filter-drawer 母题）
     入口为右侧圆形 FAB，与全站 .x-fab（回顶 / 询价）同列同形：right 14px、44px、圆形。
     档位：回顶 +20 → 询价 +80 → 本筛选 +140，步进 60px（44 按钮 + 16 间距），
     与 chatshop-alpha /learn 的 .learn-nav-bar 完全同档。 */
  .learn-nav-bar {
    position: fixed;
    right: 14px;
    bottom: calc(var(--o-bottomnav-h) + env(safe-area-inset-bottom) + 140px);
    z-index: 1001;
    padding: 0;
    margin: 0;
    background: none;
    border: 0;
    box-shadow: none;
    line-height: 0;
  }
  .learn-nav-trigger {
    display: flex;
    align-items: center;
    justify-content: center;
    width: var(--o-touch);                          /* 44px，与 .x-fab 一致 */
    height: var(--o-touch);
    padding: 0;
    border: 0;
    border-radius: 50%;
    background: var(--o-accent);
    color: var(--o-white);
    box-shadow: 0 6px 16px rgba(45, 150, 222, .28); /* 与 .x-fab 同投影 */
    cursor: pointer;
    -webkit-tap-highlight-color: transparent;
    transition: transform var(--o-dur-press) ease, background-color var(--o-dur-color) ease;
  }
  .learn-nav-trigger svg {
    display: block;
    width: 24px;
    height: 24px;
  }
  .learn-nav-trigger:active {
    transform: scale(.94);
  }
  .learn-nav-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: calc(var(--cr-bottomnav-h) + env(safe-area-inset-bottom));
    background: rgba(13, 17, 23, 0.5);
    z-index: 1100;
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.25s ease, visibility 0.25s ease;
  }
  .learn-nav-overlay.cr-open {
    opacity: 1;
    visibility: visible;
  }
  .learn-nav-drawer {
    position: fixed;
    left: 0;
    right: 0;
    bottom: calc(var(--cr-bottomnav-h) + env(safe-area-inset-bottom));
    z-index: 1101;
    background: #ffffff;
    border-radius: 14px 14px 0 0;
    box-shadow: 0 -4px 20px rgba(13, 17, 23, 0.15);
    transform: translateY(calc(100% + var(--cr-bottomnav-h) + env(safe-area-inset-bottom)));
    transition: transform 0.3s cubic-bezier(0.22, 0.61, 0.36, 1);
    max-height: 70%;
    display: flex;
    flex-direction: column;
    padding-bottom: env(safe-area-inset-bottom);
  }
  .learn-nav-drawer.cr-open {
    transform: translateY(0);
  }
  .learn-nav-handle {
    width: 36px;
    height: 4px;
    background: #d1d5db;
    border-radius: 2px;
    margin: 8px auto 4px;
    flex: 0 0 auto;
  }
  .learn-nav-title {
    flex: 0 0 auto;
    font-family: var(--cr-font-display);
    font-size: 16px;
    font-weight: 700;
    color: #000000;
    padding: 10px 14px 4px;
    margin: 0;
    text-transform: none;
    letter-spacing: 0.01em;
  }
  .learn-nav-content {
    flex: 1 1 auto;
    overflow-y: auto;
    -webkit-overflow-scrolling: touch;
    overscroll-behavior: contain;
    padding: 8px 14px;
  }
  .learn-nav-group-title {
    position: sticky;
    top: -8px;
    background: #ffffff;
    z-index: 2;
    font-family: var(--cr-font-display);
    font-size: 11px;
    font-weight: 700;
    color: #6b7280;
    text-transform: uppercase;
    letter-spacing: 0.06em;
    padding: 8px 0;
    margin: 0;
  }
  .learn-nav-list {
    display: flex;
    flex-direction: column;
  }
  .learn-nav-item {
    display: flex;
    align-items: center;
    min-height: 44px;
    padding: 8px 4px;
    font-size: 14px;
    color: #111827;
    text-decoration: none;
    border-bottom: 1px solid #e5e7eb;
  }
  .learn-nav-item:last-child {
    border-bottom: none;
  }
  .learn-nav-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    padding: 4px 0 8px;
  }
  .learn-nav-tag {
    display: inline-block;
    padding: 6px 12px;
    font-size: 14px;
    font-weight: 500;
    color: #374151;
    background: #f3f4f6;
    border-radius: 999px;
    text-decoration: none;
  }
  .learn-card:hover {
    transform: none;
  }
  .learn-cards {
    gap: 14px;
  }
  .learn-card__excerpt {
    -webkit-line-clamp: 2;
  }
}


@media (prefers-reduced-motion: reduce) {
  .learn-card,
  .learn-card__img img {
    transition: none;
  }
  .learn-card:hover {
    transform: none;
  }
  .learn-card:active {
    transform: none;
  }
  .learn-card:hover .learn-card__img img {
    transform: none;
  }
}





.pl-list-head {
  display: flex;
  align-items: center;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 24px;
}

.pl-toolbar {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  flex-wrap: wrap;
  gap: 16px;
  margin-bottom: 0;
  
  margin-left: auto;
}
.pl-toolbar__group {
  display: flex;
  align-items: center;
  gap: 8px;
}
.pl-field {
  font-size: 13px;
  color: var(--o-ink-2);
  white-space: nowrap;
  margin-bottom: 0px;
}
.pl-select {
  appearance: none;
  -webkit-appearance: none;
  border: 1px solid var(--o-line);
  border-radius: var(--o-radius-sm);
  background: var(--o-card)
    url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 24 24' fill='none' stroke='%2357606a' stroke-width='2.4' stroke-linecap='round' stroke-linejoin='round'%3E%3Cpolyline points='6 9 12 15 18 9'/%3E%3C/svg%3E")
    no-repeat right 12px center;
  padding: 0 36px 0 12px;
  height: 44px;                           
  min-width: 200px;
  font: 400 14px var(--o-font-body);
  color: var(--o-ink);
  cursor: pointer;
  transition: border-color .15s ease, box-shadow .15s ease;
}
.pl-select:hover { border-color: var(--o-ink-3); }
.pl-select:focus {
  outline: none;
  border-color: var(--o-accent);
  box-shadow: 0 0 0 3px var(--o-accent-soft);
}




.pl-tagpicker {
  position: relative;
}

.pl-tagpicker .pl-tagpicker__btn {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 8px;
  background-image: none;
  padding: 0 12px;
  width: 200px;
  text-align: left;
  line-height: normal;
  position: relative;
}
.pl-tagpicker__text {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.pl-select__arrow {
  flex: none;
  color: var(--o-ink-3);
  transition: transform .15s ease;
}
.pl-tagpicker__btn.is-open .pl-select__arrow {
  transform: rotate(180deg);
}
.pl-tagpicker__backdrop {
  position: fixed;
  inset: 0;
  z-index: 1;            
  background: transparent;
}
.pl-tagpicker__panel {
  position: absolute;
  top: calc(100% + 8px);
  z-index: 1;
  min-width: 200px;
  max-height: 470px;
  overflow-y: auto;
  background: var(--o-card);
  border: 1px solid var(--o-line);
  border-radius: var(--o-radius-sm);
  box-shadow: var(--o-shadow-hover);
  padding: 6px;
}
.pl-tagpicker__sticky {
  position: sticky;
  top: -6px;
  z-index: 2;
  margin: -6px -6px 0;          
  background: var(--o-card);
}
.pl-tagpicker__search {
  position: relative;          
  padding: 8px 10px 8px 30px;
  border-bottom: 1px solid var(--o-line);
}
.pl-tagpicker__search-icon {
  position: absolute;
  left: 12px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--o-ink-3);
  pointer-events: none;
}
.pl-tagpicker__search-input {
  width: 100%;
  height: 34px;
  padding: 0 30px 0 10px;       
  border: 1px solid var(--o-line);
  border-radius: 8px;
  background: var(--o-bg);
  color: var(--o-ink);
  font: 500 13px var(--o-font-body);
  outline: none;
}
.pl-tagpicker__search-input::placeholder {
  color: var(--o-ink-3);
}
.pl-tagpicker__search-input:focus {
  border-color: var(--o-accent);
  box-shadow: 0 0 0 3px var(--o-accent-soft);
}

.pl-tagpicker__search-clear {
  position: absolute;
  right: 16px;
  top: 50%;
  transform: translateY(-50%);
  display: flex;
  align-items: center;
  justify-content: center;
  width: 18px;
  height: 18px;
  padding: 0;
  border: none;
  background: none;
  cursor: pointer;
  color: var(--o-ink-3);
}
.pl-tagpicker__search-clear:hover {
  color: var(--o-ink);
}
.pl-tagpicker__empty {
  list-style: none;
  padding: 14px 10px;
  text-align: center;
  font-size: 13px;
  color: var(--o-ink-3);
}
.pl-tagpicker__list {
  list-style: none;
  margin: 0;
  padding: 0;
}
.pl-tagpicker__item {
  margin: 0;
}
.pl-tagpicker__opt {
  display: flex;
  align-items: center;
  gap: 8px;
  width: 100%;
  padding: 8px 10px;
  border: none;
  border-radius: 8px;
  background: none;
  cursor: pointer;
  font: 500 14px var(--o-font-body);
  text-align: left;
  color: var(--o-ink);
}
.pl-tagpicker__opt:hover {
  background: var(--o-accent-soft);
}
.pl-tagpicker__opt-text {
  flex: 1;            
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.pl-tagpicker__check {
  display: none;
  flex: none;
  width: 16px;
  height: 16px;
  color: var(--o-accent);
}
.pl-tagpicker__opt.is-active {
  color: var(--o-accent);
  font-weight: 600;
}
.pl-tagpicker__opt.is-active .pl-tagpicker__check {
  display: block;
}
.pl-tagpicker__head {
  padding: 6px;
  border-bottom: 1px solid var(--o-line);
}
.pl-tagpicker__clear {
  width: 100%;
  padding: 8px;
  border: none;
  background: none;
  cursor: pointer;
  font: 500 13px var(--o-font-body);
  color: var(--o-accent);
}
.pl-tagpicker__clear:hover {
  text-decoration: underline;
}

.category-select .pl-tagpicker__panel {
  min-width: 310px;
  left: -40px;
}

.tag-select .pl-tagpicker__panel {
  left: 36px;
}

.sort-select .pl-tagpicker__panel {
  left: 54px;
}


.pl-tagpicker__check-input {
  appearance: none;
  -webkit-appearance: none;
  width: 18px;
  height: 18px;
  min-width: 18px;
  margin: 0;
  border: 1.5px solid var(--o-line);
  border-radius: 50%;
  background: var(--o-card);
  cursor: pointer;
  position: relative;
}
.pl-tagpicker__check-input:checked {
  border-color: var(--o-accent);
  background: var(--o-accent);
}
.pl-tagpicker__check-input:checked::after {
  content: '';
  position: absolute;
  left: 5px;
  top: 2px;
  width: 5px;
  height: 9px;
  border: solid #fff;
  border-width: 0 2px 2px 0;
  transform: rotate(45deg);
}


/* ============================================================
   <picture> 三档投递（avif/webp/png）盒模型兼容
   learn 卡片/信息流/详情主图/作者头像的 <img> 外包 <picture>，
   需让 picture 撑满原 img 的盒子，否则 inline picture 会破坏
   宽高链（img width/height:100% 失去参照、object-fit 失效）。
   ============================================================ */
.learn-card__img picture,
.learn-feed-item__img picture,
.learn-article__hero picture,
.learn-author-bio__avatar picture,
.learn-author-card__avatar picture {
  display: block;
  width: 100%;
  height: 100%;
}