/* ==========================================================
   04-featured.css — 置顶文章区(大图 + 内容左右分栏卡片)
   ========================================================== */

.featured-article {
  max-width: 1400px;
  margin: 0 auto 56px;
  padding: 0 48px;
}
.featured-card {
  /* ★ 毛玻璃旋钮(和普通卡片同一套参数) */
  --glass-alpha: 0.2;
  --glass-blur: 10px;

  display: flex;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: rgba(
    255,
    255,
    255,
    var(--glass-alpha)
  ); /* 改:原来是 var(--white) */
  border: 1px solid rgba(255, 255, 255, 0.9); /* 加 */
  backdrop-filter: blur(var(--glass-blur)); /* 加 */
  -webkit-backdrop-filter: blur(var(--glass-blur)); /* 加 */
  box-shadow: 0 4px 30px rgba(0, 0, 0, 0.06);
  cursor: pointer;
  transition:
    transform var(--transition),
    box-shadow var(--transition);
  position: relative;
}
.featured-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.1);
}
.featured-card .featured-image {
  flex: 1.2;
  min-height: 400px;
  position: relative;
  overflow: hidden;
}
.featured-card .featured-image img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transition: transform 0.6s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}
.featured-card:hover .featured-image img {
  transform: scale(1.04);
}
.featured-badge {
  position: absolute;
  top: 24px;
  left: 24px;
  background: var(--brand);
  color: #1d1d1f;
  font-size: 11px;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  padding: 6px 16px;
  border-radius: 8px;
  box-shadow: 0 4px 16px rgba(255, 192, 0, 0.3);
  z-index: 2;
}
.featured-card .featured-content {
  flex: 0.8;
  padding: 48px 44px;
  display: flex;
  flex-direction: column;
  justify-content: center;
}
.featured-content .article-category {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 12px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 1.5px;
  color: var(--brand);
  margin-bottom: 16px;
}
.featured-content .article-category::before {
  content: "";
  width: 16px;
  height: 2px;
  background: var(--brand);
  border-radius: 2px;
}
.featured-content h2 {
  font-size: 30px;
  font-weight: 800;
  letter-spacing: -0.8px;
  line-height: 1.2;
  color: var(--text-primary);
  margin-bottom: 16px;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.featured-content .excerpt {
  font-size: 15px;
  line-height: 1.8;
  color: var(--text-secondary);
  margin-bottom: 32px;
  display: -webkit-box;
  -webkit-line-clamp: 4;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.featured-content .article-meta {
  display: flex;
  align-items: center;
  gap: 16px;
  font-size: 13px;
  color: var(--text-tertiary);
}
.article-meta .meta-dot {
  width: 3px;
  height: 3px;
  border-radius: 50%;
  background: var(--text-tertiary);
}
.article-meta .read-more {
  margin-left: auto;
  color: var(--text-primary);
  font-weight: 600;
  display: flex;
  align-items: center;
  gap: 6px;
  transition: var(--transition-fast);
}
.featured-card:hover .read-more {
  color: var(--brand);
}
.read-more svg {
  width: 16px;
  height: 16px;
  stroke: currentColor;
  stroke-width: 2;
  fill: none;
  transition: transform var(--transition-fast);
}
.featured-card:hover .read-more svg {
  transform: translateX(4px);
}

/* ── 入场动画初始态 ──
   故意写在基础态之后:靠层叠覆盖,把卡片先压到透明+下移,
   再由 cardEnter(定义于 01-base.css)播放归位 */
.featured-card {
  opacity: 0;
  transform: translateY(30px);
  animation: cardEnter 0.7s ease forwards;
}

/* ── 响应式 ── */
@media (max-width: 1024px) {
  .featured-card {
    flex-direction: column;
  }
  .featured-card .featured-image {
    min-height: 280px;
  }
}
@media (max-width: 768px) {
  .featured-article {
    padding: 0 24px;
    margin-bottom: 40px;
  }
  .featured-card .featured-content {
    padding: 28px 24px;
  }
  .featured-content h2 {
    font-size: 22px;
  }
}

/* ==========================================================
   05-article-grid.css — 文章网格 / 普通卡片 / 缩略图徽章 / 空态
   ========================================================== */

.articles-section {
  max-width: 1400px;
  margin: 0 auto;
  padding: 0 48px 100px;
}
.section-label {
  font-size: 13px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 2px;
  color: var(--text-tertiary);
  margin-bottom: 28px;
  display: flex;
  align-items: center;
  gap: 12px;
}
.section-label::after {
  content: "";
  flex: 1;
  height: 1px;
  background: rgba(0, 0, 0, 0.06);
}
.articles-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 24px;
}

/* ── 普通文章卡片 ── */
.article-card {
  /* ★ 毛玻璃旋钮(你定的参数) */
  --glass-alpha: 0.2;
  --glass-blur: 10px;

  background: rgba(
    255,
    255,
    255,
    var(--glass-alpha)
  ); /* 改:原来是 var(--white) */
  border: 1px solid rgba(255, 255, 255, 0.9); /* 加:透明底靠白边勾轮廓 */
  backdrop-filter: blur(var(--glass-blur)); /* 加 */
  -webkit-backdrop-filter: blur(var(--glass-blur)); /* 加 */

  border-radius: var(--radius-md); /* 原样 */
  overflow: hidden; /* 原样 */
  box-shadow: 0 2px 20px rgba(0, 0, 0, 0.04); /* 原样 */
  cursor: pointer;
  transition:
    transform var(--transition),
    box-shadow var(--transition);
  display: flex;
  flex-direction: column;
}
.article-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.1);
}
.article-card .card-thumb {
  position: relative;
  aspect-ratio: 16/10;
  overflow: hidden;
}
.article-card .card-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transition: transform 0.6s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}
.article-card:hover .card-thumb img {
  transform: scale(1.06);
}

/* ── 卡片左上角浅色玻璃徽章 ── */
.thumb-category {
  position: absolute;
  top: 14px;
  left: 14px;
  z-index: 3;
  padding: 4px 10px;
  border-radius: 999px;
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: #4d4d4da4;
  background: rgba(255, 255, 255, 0.58);
  border: 0.25px solid rgba(255, 255, 255, 0.55);
  backdrop-filter: blur(12px) saturate(160%);
  -webkit-backdrop-filter: blur(12px) saturate(160%);
  box-shadow:
    0 4px 16px rgba(31, 41, 55, 0.12),
    inset 0 0.15px 0 rgba(255, 255, 255, 0.5);
  pointer-events: none;

  /* 归位 = 上浮渐显:过渡写在基础态、延迟显式归零 */
  opacity: 1;
  transform: perspective(700px) translateZ(0) translateY(0) scale(1);
  transition:
    opacity 0.42s cubic-bezier(0.22, 1, 0.36, 1) 0s,
    transform 0.42s cubic-bezier(0.22, 1, 0.36, 1) 0s;
  will-change: transform, opacity;
}

/* 悬停 = 下沉渐隐(更快更干脆) */
.article-card:hover .thumb-category {
  opacity: 0;
  transform: perspective(700px) translateZ(-70px) translateY(7px) scale(0.92);
  transition:
    opacity 0.26s cubic-bezier(0.4, 0, 1, 1) 0s,
    transform 0.26s cubic-bezier(0.4, 0, 1, 1) 0s;
}

/* ★ 点击锁定 = 与悬停完全一致的退场姿态。
   点击后 0.5s 内由 JS 挂上此 class,
   即使用户立刻挪开鼠标,徽章也钉在退场位置,
   不会和弹窗的展开动画同框运动。
   ⚠ 必须保持在 hover 规则之后(同优先级,后者生效) */
.article-card.card--locked .thumb-category {
  opacity: 0;
  transform: perspective(700px) translateZ(-70px) translateY(7px) scale(0.92);
  transition:
    opacity 0.26s cubic-bezier(0.4, 0, 1, 1) 0s,
    transform 0.26s cubic-bezier(0.4, 0, 1, 1) 0s;
}

/* ── 卡片正文区 ── */
.article-card .card-body {
  padding: 24px 24px 28px;
  flex: 1;
  display: flex;
  flex-direction: column;
}
.card-body h3 {
  font-size: 18px;
  font-weight: 700;
  letter-spacing: -0.3px;
  line-height: 1.35;
  color: var(--text-primary);
  margin-bottom: 10px;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.card-body .card-excerpt {
  font-size: 14px;
  line-height: 1.7;
  color: var(--text-secondary);
  flex: 1;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
  margin-bottom: 20px;
}
.card-body .card-meta {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 12px;
  color: var(--text-tertiary);
  padding-top: 16px;
  border-top: 1px solid rgba(0, 0, 0, 0.04);
}
.card-meta .meta-dot {
  width: 3px;
  height: 3px;
  border-radius: 50%;
  background: var(--text-tertiary);
}

/* ── 入场动画初始态 ──
   故意写在基础态之后:靠层叠覆盖,先压到透明+下移,
   再由 cardEnter(定义于 01-base.css)播放归位 */
.article-card {
  opacity: 0;
  transform: translateY(40px);
  animation: cardEnter 0.6s ease forwards;
}

/* ── 空态(筛选无结果时由 JS 插入) ── */
.articles-empty {
  grid-column: 1 / -1;
  padding: 96px 24px;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  color: var(--text-tertiary);
  animation: cardEnter 0.5s ease both;
}
.articles-empty svg {
  width: 52px;
  height: 52px;
  stroke: rgba(0, 0, 0, 0.18);
  stroke-width: 1.5;
  stroke-linecap: round;
  stroke-linejoin: round;
  fill: none;
  margin-bottom: 18px;
}
.articles-empty p {
  font-size: 15px;
  font-weight: 600;
  letter-spacing: 4px;
}

/* ── 响应式 ── */
@media (max-width: 1024px) {
  .articles-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}
@media (max-width: 768px) {
  .articles-section {
    padding: 0 24px 80px;
  }
  .articles-grid {
    grid-template-columns: 1fr;
    gap: 20px;
  }
}