/* ============================================================
   index.css - 首页专用样式
   仅 index.html 需要，需搭配 common.css 一起引用
   ============================================================ */


/* ==================== index 页面专用 CSS 变量 ==================== */


/* ==================== 搜索框 ==================== */

.search-box {
  flex: 0 1 400px; position: relative; max-width: 400px; margin-left: auto;
}
.search-box input {
  width: 100%; padding: 8px 60px 8px 36px;
  border: 1px solid var(--border); border-radius: 8px;
  background: var(--card-bg); color: var(--text);
  font-size: 14px; outline: none; transition: border .2s, padding .15s;
}
.search-box input:focus { border-color: var(--accent); }
.search-box .icon {
  position: absolute; left: 12px; top: 50%; transform: translateY(-50%);
  color: var(--text-secondary); font-size: 14px;
}
/* 清除按钮：仅在有输入内容时显示，位于 Ctrl+K 左侧，二者不重叠 */
.search-clear {
  position: absolute; right: 64px; top: 50%; transform: translateY(-50%);
  width: 20px; height: 20px; padding: 0; line-height: 18px; text-align: center;
  border: none; border-radius: 50%; background: var(--tag-bg); color: var(--text-secondary);
  font-size: 15px; cursor: pointer; display: none; transition: background .15s, color .15s;
}
.search-clear:hover { background: var(--accent); color: #fff; }
.search-box.has-text .search-clear { display: block; }
.search-box.has-text input { padding-right: 92px; }
.search-kbd {
  position: absolute; right: 10px; top: 50%; transform: translateY(-50%);
  background: var(--tag-bg); color: var(--text-secondary);
  font-size: 11px; padding: 2px 6px; border-radius: 4px;
  border: 1px solid var(--border); pointer-events: none;
  font-family: inherit; line-height: 1.4;
}


/* ==================== 主布局：侧边栏 + 内容 ==================== */

.layout-wrapper {
  max-width: var(--layout-max-width);
  margin: 0 auto;
  display: flex;
  gap: 0;
  padding: 0 20px;
}

/* 左侧导航 */
.sidebar {
  width: var(--sidebar-w);
  flex-shrink: 0;
  position: sticky;
  top: 70px;
  align-self: flex-start;
  padding: 20px 8px 20px 0;
  height: calc(100vh - 140px);
  overflow-y: auto;
}
.sidebar-title {
  font-size: 14px; font-weight: 600; color: var(--text-secondary);
  margin-bottom: 10px; padding-left: 6px; letter-spacing: 1px;
}
.cat-nav { display: flex; flex-direction: column; gap: 3px; }
.cat-nav img{ width:16px; vertical-align: middle}
.cat-tag {
  padding: 4px 6px; border-radius: 8px; font-size: 13px; cursor: pointer;
  border: 1px solid transparent; background: transparent;
  color: var(--text-secondary); transition: all .2s;
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}
.cat-tag:hover { background: var(--accent-light); color: var(--accent); border-color: var(--accent); }
.cat-tag.active { background: var(--accent); color: #fff; font-weight: 600; }
.cnt-all, .cnt-cat { margin-left: 4px; font-size: 11px; opacity: 0.7; font-weight: 400; }
.cat-tag.active .cnt-all, .cat-tag.active .cnt-cat { opacity: 1; }

/* 右侧内容 */
.main-content {
  flex: 1; min-width: 0; padding-left: 20px; border-left: 1px solid var(--border);
}


/* ==================== 分类区块 ==================== */

.section {
  margin: 20px 0; scroll-margin-top: 70px; opacity: 0; transform: translateY(20px);
  animation: fadeInUp 0.6s forwards;
}
@keyframes fadeInUp { to { opacity: 1; transform: translateY(0); } }
.section-title { font-size: 22px; font-weight: 700; margin-bottom: 16px; display: flex; align-items: center; gap: 8px; }
.section-title .count { font-size: 13px; font-weight: 400; color: var(--text-secondary); background: var(--tag-bg); padding: 2px 10px; border-radius: 12px; }

/* 二级导航 */
.sub-nav { display: flex; gap: 6px; margin-bottom: 16px; flex-wrap: wrap; }
.sub-nav-btn {
  padding: 5px 14px; border-radius: 6px; font-size: 13px; cursor: pointer;
  border: 1px solid var(--border); background: var(--card-bg); color: var(--text-secondary); transition: all .2s;
}
.sub-nav-btn:hover { border-color: var(--accent); color: var(--accent); }
.sub-nav-btn.active { background: var(--accent-light); color: var(--accent); border-color: var(--accent); font-weight: 600; }


/* ==================== 卡片网格 ==================== */

.grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 14px; }
.card {
  background: var(--card-bg); border: 1px solid var(--border); border-radius: var(--radius);
  padding: 18px; transition: all .25s; display: flex; flex-direction: column;
}
.card:hover { transform: translateY(-2px); box-shadow: var(--shadow); border-color: var(--accent); }
.card-header { display: flex; align-items: flex-start; gap: 12px; margin-bottom: 8px; }
.card-icon { width: 36px; height: 36px; border-radius: 10px; background: var(--accent-light); display: flex; align-items: center; justify-content: center; font-size: 18px; flex-shrink: 0; }
.card-title { font-size: 16px; font-weight: 600; flex: 1; }
.card-title .source { font-size: 12px; color: var(--text-secondary); font-weight: 400; margin-left: 6px; }
.card-desc { font-size: 13px; color: var(--text-secondary); line-height: 1.6; flex: 1; margin-bottom: 10px; }
.card-tags { display: flex; flex-wrap: wrap; gap: 4px; margin-bottom: 10px; }
.tag { padding: 2px 8px; border-radius: 4px; font-size: 11px; background: var(--tag-bg); color: var(--accent); }
.tag.free { background: #e6f7e6; color: #16a34a; }
.dark .tag.free { background: #0a2e1a; color: #4ade80; }
.tag.paid { background: #fef3c7; color: #d97706; }
.dark .tag.paid { background: #2e200a; color: #fbbf24; }
.card-link { display: inline-flex; align-items: center; gap: 4px; font-size: 13px; font-weight: 500; margin-top: auto; }
.card-detail-link { color: var(--accent); }


/* ==================== 懒加载骨架屏 ==================== */

.lazy-placeholder { animation: pulse 1.5s infinite; display: flex; flex-direction: column; gap: 10px; height: 100%; width: 100%; min-height: 110px; }
.skeleton-header { display: flex; gap: 12px; align-items: center; margin-bottom: 8px; }
.skeleton-icon { width: 36px; height: 36px; border-radius: 10px; background: var(--border); flex-shrink: 0; }
.skeleton-title { width: 60%; height: 18px; border-radius: 4px; background: var(--border); }
.skeleton-text { width: 100%; height: 12px; border-radius: 4px; background: var(--border); margin-bottom: 4px; }
.skeleton-text.short { width: 70%; }
@keyframes pulse { 0% { opacity: 0.6; } 50% { opacity: 0.3; } 100% { opacity: 0.6; } }


/* ==================== 返回顶部按钮 ==================== */

.back-to-top { position: fixed; bottom: 50px; right: 40px; z-index: 999; width: 44px; height: 44px; border-radius: 50%; background: var(--accent); color: #fff; border: none; cursor: pointer; display: flex; align-items: center; justify-content: center; font-size: 20px; box-shadow: 0 2px 12px rgba(37,99,235,0.4); opacity: 0; visibility: hidden; transition: all .3s ease; }
.back-to-top.show { opacity: 1; visibility: visible; }
.back-to-top:hover { transform: translateY(-3px); background: var(--accent-hover); }


/* ==================== 隐藏 ==================== */

.hidden { display: none !important; }


/* ==================== 模态搜索框 ==================== */

.search-modal-overlay { display: none; position: fixed; inset: 0; z-index: 1000; background: rgba(0,0,0,0.45); backdrop-filter: blur(4px); justify-content: center; align-items: flex-start; padding-top: 15vh; }
.search-modal-overlay.open { display: flex; }
.search-modal { width: 90%; max-width: 580px; background: var(--card-bg); border: 1px solid var(--border); border-radius: 14px; box-shadow: 0 16px 48px rgba(0,0,0,0.2); overflow: hidden; animation: modalIn 0.2s ease; }
@keyframes modalIn { from { opacity: 0; transform: scale(0.96) translateY(-10px); } to { opacity: 1; transform: scale(1) translateY(0); } }
.search-modal-input-wrap { display: flex; align-items: center; gap: 10px; padding: 14px 18px; border-bottom: 1px solid var(--border); }
.search-modal-input-wrap .icon { font-size: 18px; flex-shrink: 0; color: var(--text-secondary); }
.search-modal-input { flex: 1; border: none; outline: none; background: transparent; font-size: 16px; color: var(--text); font-family: inherit; }
.search-modal-input::placeholder { color: var(--text-secondary); }
.search-modal-kbd { font-size: 11px; padding: 2px 6px; border-radius: 4px; background: var(--tag-bg); color: var(--text-secondary); border: 1px solid var(--border); font-family: inherit; }
.search-modal-results { max-height: 360px; overflow-y: auto; padding: 8px; }
.search-modal-results:empty { display: none; }
.search-modal-result-item { display: flex; align-items: center; gap: 10px; padding: 10px 12px; border-radius: 8px; cursor: pointer; transition: background 0.15s; }
.search-modal-result-item:hover { background: var(--accent-light); }
.search-modal-result-item .r-icon { width: 32px; height: 32px; border-radius: 8px; background: var(--accent-light); display: flex; align-items: center; justify-content: center; font-size: 16px; flex-shrink: 0; }
.search-modal-result-item .r-info { flex: 1; min-width: 0; }
.search-modal-result-item .r-name { font-size: 14px; font-weight: 600; color: var(--text); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.search-modal-result-item .r-desc { font-size: 12px; color: var(--text-secondary); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; }
.search-modal-result-item .r-cat { font-size: 11px; padding: 2px 8px; border-radius: 4px; background: var(--tag-bg); color: var(--accent); flex-shrink: 0; }
.search-modal-empty { text-align: center; padding: 30px 20px; color: var(--text-secondary); font-size: 14px; }
.search-modal-footer { display: flex; align-items: center; gap: 16px; padding: 10px 18px; border-top: 1px solid var(--border); font-size: 12px; color: var(--text-secondary); }
.search-modal-footer kbd { font-size: 11px; padding: 1px 5px; border-radius: 3px; background: var(--tag-bg); border: 1px solid var(--border); font-family: inherit; margin-right: 4px; }


/* ==================== Favicon 图标样式 ==================== */

.card-favicon { width: 28px; height: 28px; border-radius: 6px; object-fit: contain; display: block; }
.card-icon .emoji-icon { font-size: 1.5rem; display: block; line-height: 1; }


/* ==================== 延迟加载动画 ==================== */

.card.delayed-load {
  animation: delayedFadeIn 0.6s both;
}
@keyframes delayedFadeIn {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}


/* ==================== index 页面响应式 ==================== */

@media (max-width: 820px) {
  .subtitle { order: 4; flex-basis: 100%; font-size: 12px; margin-top: 5px; color: var(--text-secondary); }
  .layout-wrapper { flex-direction: column; padding: 0 16px; }
  .sidebar { width: 100%; position: static; padding: 12px 0; border-bottom: 1px solid var(--border); margin-bottom: 12px; height: auto; overflow-y: visible; }
  .sidebar-title { display: none; }
  .cat-nav { flex-direction: row; flex-wrap: wrap; gap: 6px; }
  .cat-tag { padding: 5px 12px; font-size: 12px; background: var(--card-bg); border-color: var(--border); }
  .cat-tag.active { border-color: var(--accent); }
  .main-content { padding-left: 0; border-left: none; }
  .header-inner { flex-wrap: wrap; }
  .search-box { order: 3; max-width: 100%; flex-basis: 100%; margin-left: 0; }
  .grid { grid-template-columns: 1fr; }
  .section { animation: fadeIn 0.5s forwards; }
  @keyframes fadeIn { to { opacity: 1; transform: translateY(0); } }
}

@media (max-width: 640px) {
  .back-to-top { bottom: 40px; right: 40px; width: 40px; height: 40px; font-size: 18px; }
}