/* ============================================================
 *  components.css  ——  公共组件（导航、卡片、按钮、徽章、面包屑等）
 * ============================================================ */

/* ---------- 站点导航 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: var(--bg-primary);
  border-bottom: 1px solid var(--border);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 56px;
  gap: 24px;
}

.site-header__nav {
  display: flex;
  align-items: center;
  flex: 1 1 auto;
  justify-content: center;
}

.site-header__brand {
  display: flex;
  align-items: center;
  gap: 8px;
  color: var(--text-primary);
  font-weight: 600;
  font-size: 15px;
}

.site-header__brand:hover {
  color: var(--text-primary);
}

.site-header__logo {
  width: 24px;
  height: 24px;
  display: block;
}

.site-header__title {
  font-weight: 700;
  letter-spacing: -0.01em;
}

/* 品牌下拉菜单 */
.site-header__brand-wrap {
  position: relative;
}

.site-header__caret {
  margin-left: 2px;
  opacity: 0.55;
  transition: transform 0.18s ease, opacity 0.18s ease;
}

.site-header__brand-wrap.is-open .site-header__caret {
  transform: rotate(180deg);
  opacity: 1;
}

.brand-dropdown__menu {
  position: absolute;
  top: calc(100% + 10px);
  left: 0;
  margin: 0;
  padding: 6px;
  list-style: none;
  min-width: 220px;
  background: var(--bg-elevated-strong);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border: 1px solid var(--border);
  border-radius: 12px;
  box-shadow: 0 12px 32px rgba(0, 0, 0, 0.32);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-6px);
  transition: opacity 0.16s ease, transform 0.16s ease, visibility 0s linear 0.16s;
  z-index: 200;
}

.site-header__brand-wrap.is-open .brand-dropdown__menu {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
  transition: opacity 0.18s ease, transform 0.18s ease, visibility 0s;
}

.brand-dropdown__item {
  display: grid;
  grid-template-columns: 24px 1fr;
  grid-template-rows: auto auto;
  align-items: center;
  column-gap: 10px;
  padding: 8px 10px;
  border-radius: 8px;
  color: var(--text-primary);
  text-decoration: none;
  transition: background 0.12s ease;
}

.brand-dropdown__item:hover,
.brand-dropdown__item:focus-visible {
  background: var(--bg-elevated);
  outline: none;
}

.brand-dropdown__item--current {
  background: rgba(124, 92, 255, 0.14);
}

.brand-dropdown__item--current .brand-dropdown__label {
  color: var(--accent);
}

.brand-dropdown__icon {
  grid-row: 1 / span 2;
  font-size: 18px;
  line-height: 1;
}

.brand-dropdown__label {
  grid-column: 2;
  grid-row: 1;
  font-size: 14px;
  font-weight: 600;
  color: var(--text-primary);
}

.brand-dropdown__sub {
  grid-column: 2;
  grid-row: 2;
  font-size: 11px;
  color: var(--text-secondary);
  font-family: monospace;
  letter-spacing: 0.02em;
}

.site-nav__list {
  display: flex;
  list-style: none;
  margin: 0;
  padding: 0;
  gap: 4px;
}

.site-nav__link {
  display: inline-block;
  padding: 7px 14px;
  border-radius: 6px;
  color: var(--text-secondary);
  font-size: 14px;
  font-weight: 500;
  transition: color 0.15s ease, background-color 0.15s ease;
}

.site-nav__link:hover {
  color: var(--text-primary);
  background: var(--bg-secondary);
}

.site-nav__link.is-active {
  color: var(--accent);
  background: var(--accent-faint);
  font-weight: 600;
}

.site-header__tools {
  display: flex;
  align-items: center;
  gap: 4px;
}

.icon-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border-radius: 4px;
  background: transparent;
  color: var(--text-secondary);
  transition: color 0.15s ease, background-color 0.15s ease;
  border: 1px solid transparent;
}

.icon-btn:hover {
  color: var(--text-primary);
  background: var(--bg-secondary);
}

/* 主题按钮图标切换 */
.theme-icon { display: none; }
[data-theme='dark']  .theme-icon--dark  { display: block; }
[data-theme='light'] .theme-icon--light { display: block; }

/* 移动端菜单按钮：默认隐藏 */
.site-header__menu { display: none; }

@media (max-width: 768px) {
  .site-header__menu { display: inline-flex; }
  .site-nav {
    position: absolute;
    top: 56px;
    left: 0;
    right: 0;
    background: var(--bg-secondary);
    border-bottom: 1px solid var(--border);
    padding: 8px 24px;
    display: none;
  }
  .site-nav.is-open { display: block; }
  .site-nav__list { flex-direction: column; gap: 0; }
  .site-nav__link {
    display: block;
    padding: 10px 12px;
  }
}

/* ---------- 页脚 ---------- */
.site-footer {
  margin-top: 64px;
  padding: 32px 0;
  /* border-top 由 .site-footer__meta 提供,避免 brand 块隐藏后出现两条分割线 */
}

.site-footer__inner {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 16px 32px;
  align-items: start;
}

.site-footer__title {
  font-size: 14px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 4px;
}

.site-footer__slogan {
  color: var(--text-tertiary);
  font-size: 13px;
}

.site-footer__links {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  justify-self: end;
}

.site-footer__link {
  color: var(--text-secondary);
  font-size: 13px;
  padding: 4px 0;
}

.site-footer__link:hover {
  color: var(--text-primary);
}

.site-footer__meta {
  grid-column: 1 / -1;
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 8px;
  padding-top: 16px;
  border-top: 1px solid var(--border);
  color: var(--text-tertiary);
  font-size: 12px;
}

@media (max-width: 640px) {
  .site-footer__inner {
    grid-template-columns: 1fr;
  }
  .site-footer__links {
    justify-self: start;
  }
}

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 20px;
  border-radius: 8px;
  font-size: 14px;
  font-weight: 500;
  border: 1px solid transparent;
  cursor: pointer;
  transition: all 0.2s ease;
  white-space: nowrap;
  user-select: none;
}

.btn--primary {
  background: linear-gradient(135deg, var(--accent) 0%, var(--accent-2) 100%);
  color: #fff;
  box-shadow: 0 2px 8px rgba(124, 92, 255, 0.25);
}

.btn--primary:hover {
  transform: translateY(-1px);
  box-shadow: 0 6px 16px rgba(124, 92, 255, 0.35);
  color: #fff;
}

.btn--ghost {
  background: var(--bg-secondary);
  color: var(--text-primary);
  border-color: var(--border-strong);
}

.btn--ghost:hover {
  border-color: var(--text-tertiary);
  color: var(--text-primary);
  background: var(--bg-tertiary);
}

.btn--sm {
  padding: 6px 12px;
  font-size: 13px;
}

/* ---------- 卡片 ---------- */
.card {
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 12px;
  overflow: hidden;
  transition: all 0.2s ease;
  /* flex column 让 body 撑满 card 剩余空间，meta 才能贴底 */
  display: flex;
  flex-direction: column;
  /* grid item 默认 stretch；强制 card 占满 grid cell 高度（同行等高） */
  height: 100%;
}

.card:hover {
  border-color: var(--border-strong);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.card__cover {
  position: relative;
  display: block;
  width: 100%;
  aspect-ratio: 2 / 1;
  overflow: hidden;
  background: var(--bg-tertiary);
  /* cover 是固定高度（aspect-ratio: 2/1），不让 flex 把它压缩 */
  flex: 0 0 auto;
}

.card__cover img,
.card__cover svg {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.4s ease;
}

.card:hover .card__cover img,
.card:hover .card__cover svg {
  transform: scale(1.04);
}

.card__cover-badge {
  position: absolute;
  top: 12px;
  left: 12px;
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 4px 10px;
  font-size: 12px;
  font-weight: 500;
  color: #fff;
  background: rgba(0, 0, 0, 0.45);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border-radius: 999px;
  border: 1px solid rgba(255, 255, 255, 0.12);
  letter-spacing: 0.2px;
  pointer-events: none;
}

.card__body {
  padding: 14px 16px 16px;
  display: flex;
  flex-direction: column;
  /* 撑满 card 减去 cover 后的剩余高度，让 .card__meta margin-top: auto
     能把日期推到卡片左下角 */
  flex: 1 1 auto;
}

.card__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-bottom: 8px;
}

.card__title {
  font-size: 15px;
  font-weight: 600;
  color: var(--text-primary);
  margin: 0 0 4px;
  line-height: 1.4;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.card__title a {
  color: inherit;
}

.card__title a:hover {
  color: var(--accent);
}

.card__summary {
  color: var(--text-secondary);
  font-size: 13px;
  line-height: 1.55;
  margin: 0 0 10px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  /* 强制 summary 区域至少 2 行高（line-height 1.55 * font-size 13 * 2 ≈ 40px），
     让所有 card 的 body 等高 → meta 统一贴卡左下角 */
  min-height: calc(1.55em * 2);
}

.card__meta {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-size: 12px;
  color: var(--text-tertiary);
  gap: 8px;
  /* 把 meta 推到 .card__body（flex column）底部，让日期统一贴卡左下角，
     不论 summary 是 1 行还是 2 行 */
  margin-top: auto;
}

.card__meta-left {
  display: flex;
  align-items: center;
  gap: 8px;
}

.card__dot {
  width: 3px;
  height: 3px;
  background: var(--text-tertiary);
  border-radius: 50%;
}

/* ---------- 徽章 / 标签 ---------- */
.badge {
  display: inline-block;
  padding: 2px 8px;
  border-radius: 4px;
  background: transparent;
  color: var(--text-secondary);
  font-size: 12px;
  font-weight: 500;
  border: 1px solid var(--border);
}

.badge--solid {
  background: var(--accent);
  color: #fff;
  border-color: transparent;
}

.badge--outline {
  background: transparent;
  border-color: var(--border-strong);
  color: var(--text-secondary);
}

/* ---------- 面包屑 ---------- */
.breadcrumb {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 8px;
  font-size: 13px;
  color: var(--text-tertiary);
  margin-bottom: 16px;
}

.breadcrumb a {
  color: var(--text-secondary);
}

.breadcrumb a:hover { color: var(--accent); }

.breadcrumb__sep {
  color: var(--text-tertiary);
  opacity: 0.5;
}

.breadcrumb__current {
  color: var(--text-primary);
  font-weight: 500;
}

/* ---------- 通用工具 ---------- */
.section-title {
  font-size: 20px;
  font-weight: 700;
  margin: 0 0 20px;
  display: flex;
  align-items: center;
  gap: 12px;
  color: var(--text-primary);
}

.section-title__accent {
  width: 4px;
  height: 20px;
  background: var(--gradient);
  border-radius: 2px;
  display: inline-block;
}

/* ---------- 文章卡片网格（首页 / 分类页共享） ---------- */
.article-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
}

@media (max-width: 1024px) { .article-grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 640px)  { .article-grid { grid-template-columns: 1fr; } }

.section-subtitle {
  color: var(--text-secondary);
  font-size: 14px;
  margin: -16px 0 24px;
}

.empty-state {
  text-align: center;
  padding: 60px 20px;
  color: var(--text-tertiary);
}

.empty-state__icon {
  font-size: 48px;
  margin-bottom: 12px;
  opacity: 0.5;
}

/* ---------- 搜索弹层：顶部抽屉（去全屏遮罩） ---------- */
.search-overlay {
  position: fixed;
  top: 56px;          /* header 高度 */
  left: 0;
  right: 0;
  z-index: 1000;
  align-items: flex-start;
  justify-content: center;
  padding: 16px 20px;
  /* 无黑色背景遮罩 */
}
/* 关键：HTML 的 hidden 属性等同 display:none，但被下面的 display:flex 覆盖了。
   这里用 :not([hidden]) 显式控制：只有 JS 移除 hidden 后才显示。 */
.search-overlay:not([hidden]) {
  display: flex;
}
.search-overlay[hidden] {
  display: none;
}

/* 点击抽屉外的关闭层（透明捕获器） */
.search-overlay-backdrop {
  position: fixed;
  inset: 0;
  z-index: 999;
  display: none;
}
.search-overlay-backdrop:not([hidden]) {
  display: block;
}

.search-modal {
  width: 100%;
  max-width: 600px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-strong);
  border-radius: 12px;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  max-height: calc(100vh - 56px - 32px);
  box-shadow: var(--shadow-lg);
  /* 抽屉出场动画 */
  animation: search-drop 0.18s ease-out;
}

@keyframes search-drop {
  from { opacity: 0; transform: translateY(-8px); }
  to   { opacity: 1; transform: translateY(0); }
}

.search-modal__input-wrap {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 16px;
  border-bottom: 1px solid var(--border);
}

.search-modal__icon { color: var(--text-tertiary); flex-shrink: 0; }

.search-modal__input {
  flex: 1;
  background: transparent;
  border: none;
  outline: none;
  font-size: 15px;
  color: var(--text-primary);
  padding: 4px 0;
}

.search-modal__input::placeholder { color: var(--text-tertiary); }

.search-modal__close {
  padding: 3px 8px;
  font-size: 11px;
  color: var(--text-tertiary);
  background: var(--bg-tertiary);
  border: 1px solid var(--border);
  border-radius: 4px;
  font-family: monospace;
  cursor: pointer;
}

.search-modal__results {
  flex: 1;
  overflow-y: auto;
  padding: 4px;
}

.search-result {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  padding: 10px 12px;
  border-radius: 4px;
  color: var(--text-primary);
  transition: background-color 0.1s ease;
}

.search-result:hover,
.search-result.is-active {
  background: var(--gradient-soft);
  color: var(--text-primary);
}

.search-result__icon {
  font-size: 20px;
  flex-shrink: 0;
  line-height: 1;
}

.search-result__body { flex: 1; min-width: 0; }

.search-result__title {
  font-size: 14px;
  font-weight: 500;
  margin-bottom: 3px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.search-result__title mark,
.search-result__summary mark {
  background: transparent;
  color: var(--accent);
  font-weight: 600;
}

.search-result__summary {
  font-size: 13px;
  color: var(--text-secondary);
  line-height: 1.5;
  margin-bottom: 5px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

.search-result__meta {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 12px;
  color: var(--text-tertiary);
}

.search-empty {
  text-align: center;
  padding: 40px 20px;
  color: var(--text-tertiary);
}

.search-empty__icon {
  font-size: 32px;
  opacity: 0.4;
  margin-bottom: 8px;
}

.search-empty__hint {
  font-size: 12px;
  margin-top: 8px;
  color: var(--text-tertiary);
}

.search-modal__footer {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 8px 16px;
  border-top: 1px solid var(--border);
  font-size: 12px;
  color: var(--text-tertiary);
}

.search-modal__footer kbd {
  display: inline-block;
  padding: 1px 6px;
  margin: 0 2px;
  font-family: monospace;
  background: var(--bg-tertiary);
  border: 1px solid var(--border);
  border-radius: 3px;
  font-size: 11px;
}

@media (max-width: 640px) {
  .search-overlay { padding: 60px 12px 12px; }
  .search-modal { max-height: calc(100vh - 80px); }
  .search-modal__footer { display: none; }
}

/* ============================================================
 *  分类网格 + 分类卡片（首页 / 列表页共享）
 * ============================================================ */
.categories-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 22px;
}

@media (max-width: 1024px) { .categories-grid { grid-template-columns: repeat(2, 1fr); } }
@media (max-width: 640px)  { .categories-grid { grid-template-columns: 1fr; } }

/* 全部分类页：按父分类分组的卡片网格 */
.cat-list-section {
  margin-bottom: 36px;
}

.cat-list-section:last-child {
  margin-bottom: 0;
}

.cat-list-section__title {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  font-weight: 600;
  color: var(--text-tertiary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin: 0 0 14px;
  padding: 0 4px;
}

.cat-list-section__icon {
  font-size: 16px;
}

.cat-list-section__count {
  margin-left: auto;
  font-size: 11px;
  font-weight: 500;
  padding: 2px 8px;
  background: var(--bg-secondary);
  border: 1px solid var(--border);
  border-radius: 999px;
  color: var(--text-tertiary);
  letter-spacing: 0;
  text-transform: none;
}