/* KNN 网站导航 - 前台 */
.knn-nav {
  --nv-bg: #fff;
  --nv-bg2: #f6f7f9;
  --nv-bd: #e6e8eb;
  --nv-fg: #1f2328;
  --nv-fg2: #656d76;
  --nv-ac: #2b7fff;
  --nv-sh: 0 1px 3px rgba(16, 24, 40, .06);
  --nv-sh2: 0 4px 14px rgba(16, 24, 40, .1);
  margin: 20px 0 40px;
  color: var(--nv-fg);
}
body.dark-mode .knn-nav,
.knn-nav.knn-nav-dark {
  --nv-bg: #1b1f24;
  --nv-bg2: #22272d;
  --nv-bd: #31363d;
  --nv-fg: #e6edf3;
  --nv-fg2: #9198a1;
  --nv-sh: 0 1px 3px rgba(0, 0, 0, .3);
  --nv-sh2: 0 4px 14px rgba(0, 0, 0, .4);
}

/* 头部 */
.knn-nav-head { margin-bottom: 18px; }
.knn-nav-title { margin: 0 0 4px; font-size: 22px; font-weight: 700; letter-spacing: .2px; }
.knn-nav-desc { margin: 0 0 14px; color: var(--nv-fg2); font-size: 13px; }

.knn-nav-searchbox { position: relative; max-width: 460px; }
.knn-nav-searchbox input {
  width: 100%; box-sizing: border-box;
  padding: 10px 92px 10px 38px;
  border: 1px solid var(--nv-bd); border-radius: 10px;
  background: var(--nv-bg) url("data:image/svg+xml;utf8,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%239198a1' stroke-width='2'><circle cx='11' cy='11' r='7'/><path d='M20 20l-3.5-3.5'/></svg>") no-repeat 12px center / 16px 16px;
  color: var(--nv-fg); font-size: 14px; outline: none;
  transition: border-color .15s, box-shadow .15s;
}
.knn-nav-searchbox input:focus { border-color: var(--nv-ac); box-shadow: 0 0 0 3px rgba(43, 127, 255, .14); }
.knn-nav-count {
  position: absolute; right: 12px; top: 50%; transform: translateY(-50%);
  font-size: 12px; color: var(--nv-fg2); pointer-events: none;
}

/* 主体 */
.knn-nav-body { display: flex; gap: 20px; align-items: flex-start; }
.knn-nav-body.no-side .knn-nav-main { width: 100%; }
.knn-nav-main { flex: 1; min-width: 0; }

/* 侧边栏 */
.knn-nav-side { width: 168px; flex: none; position: sticky; top: 76px; }
.knn-nav-side-inner {
  background: var(--nv-bg); border: 1px solid var(--nv-bd); border-radius: 12px;
  padding: 8px; box-shadow: var(--nv-sh);
}
.knn-nav-side-item {
  display: flex; align-items: center; justify-content: space-between; gap: 8px;
  padding: 8px 12px; border-radius: 8px; font-size: 13.5px;
  color: var(--nv-fg2); text-decoration: none; transition: background .15s, color .15s;
}
.knn-nav-side-item:hover { background: var(--nv-bg2); color: var(--nv-fg); }
.knn-nav-side-item.is-on { background: rgba(43, 127, 255, .1); color: var(--nv-ac); font-weight: 600; }
.knn-nav-side-item .n {
  font-size: 11px; color: var(--nv-fg2); background: var(--nv-bg2);
  border-radius: 8px; padding: 0 6px; line-height: 17px;
}

/* 分区 */
.knn-nav-sec { margin-bottom: 26px; scroll-margin-top: 80px; }
.knn-nav-sec.hide { display: none; }
.knn-nav-h3 {
  display: flex; align-items: center; gap: 8px;
  margin: 0 0 12px; font-size: 15px; font-weight: 700;
  padding-bottom: 8px; border-bottom: 1px solid var(--nv-bd);
}
.knn-nav-h3 .n {
  font-size: 11px; font-weight: 400; color: var(--nv-fg2);
  background: var(--nv-bg2); border-radius: 8px; padding: 1px 7px;
}

/* 网格 */
.knn-nav-grid {
  display: grid; gap: 12px;
  grid-template-columns: repeat(auto-fill, minmax(210px, 1fr));
}

/* 卡片 */
.knn-nav-card {
  position: relative; display: flex; align-items: center; gap: 11px;
  padding: 13px 14px; border-radius: 12px;
  background: var(--nv-bg); border: 1px solid var(--nv-bd);
  box-shadow: var(--nv-sh); text-decoration: none; color: var(--nv-fg);
  transition: transform .16s, box-shadow .16s, border-color .16s;
}
.knn-nav-card:hover {
  transform: translateY(-2px); box-shadow: var(--nv-sh2);
  border-color: var(--nv-ac); color: var(--nv-fg);
}
.knn-nav-card.hide { display: none; }

.knn-nav-ico {
  position: relative; flex: none; width: 34px; height: 34px; border-radius: 9px;
  display: flex; align-items: center; justify-content: center;
  background: var(--nv-bg2); overflow: hidden;
}
.knn-nav-ico img {
  position: absolute; inset: 7px; width: 20px; height: 20px; object-fit: contain;
}
.knn-nav-ico .knn-nav-letter { display: none; }
/* 图标加载失败、或压根没有图标地址时，显示首字母色块 */
.knn-nav-ico.is-fail img { display: none; }
.knn-nav-ico.is-fail .knn-nav-letter {
  display: flex; align-items: center; justify-content: center;
  width: 100%; height: 100%; color: #fff; font-size: 15px; font-weight: 700;
}

.knn-nav-txt { min-width: 0; flex: 1; display: flex; flex-direction: column; gap: 2px; }
.knn-nav-nm {
  font-size: 14px; font-weight: 600; line-height: 1.35;
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}
.knn-nav-ds {
  font-size: 12px; color: var(--nv-fg2); line-height: 1.4;
  overflow: hidden; text-overflow: ellipsis; display: -webkit-box;
  -webkit-line-clamp: 1; -webkit-box-orient: vertical;
}
.knn-nav-star { color: #f5a623; font-size: 12px; margin-left: 4px; }
.knn-nav-hits {
  flex: none; font-size: 11px; color: var(--nv-fg2);
  background: var(--nv-bg2); border-radius: 8px; padding: 1px 6px;
}

/* 列表模式 */
.knn-nav.is-list .knn-nav-grid { grid-template-columns: repeat(auto-fill, minmax(280px, 1fr)); }
.knn-nav.is-list .knn-nav-card { padding: 10px 12px; border-radius: 9px; box-shadow: none; }
.knn-nav.is-list .knn-nav-ico { width: 26px; height: 26px; border-radius: 7px; }
.knn-nav.is-list .knn-nav-ico img { inset: 5px; width: 16px; height: 16px; }

/* 空态 */
.knn-nav-none { display: none; padding: 40px 0; text-align: center; color: var(--nv-fg2); font-size: 14px; }
.knn-nav-none.show { display: block; }
.knn-nav-empty { padding: 30px; text-align: center; color: #656d76; background: #fff; border: 1px dashed #d0d7de; border-radius: 12px; }

/* 移动端：侧边栏变横向条 */
@media (max-width: 860px) {
  .knn-nav-body { flex-direction: column; gap: 14px; }
  .knn-nav-side { width: 100%; position: static; }
  .knn-nav-side-inner {
    display: flex; gap: 8px; overflow-x: auto; padding: 8px;
    -webkit-overflow-scrolling: touch; scrollbar-width: none;
  }
  .knn-nav-side-inner::-webkit-scrollbar { display: none; }
  .knn-nav-side-item { flex: none; white-space: nowrap; }
  .knn-nav-grid { grid-template-columns: repeat(auto-fill, minmax(160px, 1fr)); }
  .knn-nav-title { font-size: 19px; }
}
@media (max-width: 480px) {
  .knn-nav-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 10px; }
  .knn-nav-card { padding: 11px 10px; gap: 8px; }
  .knn-nav-nm { font-size: 13px; }
  .knn-nav-ds { display: none; }
  .knn-nav-hits { display: none; }
}