/* ============================================================
   category.css — 封面栏目页专属样式
   依赖 common.css 提供 CSS 变量、reset、topnav、sidebar、footer
   ============================================================ */

/* ============================================================
   Page Layout
   ============================================================ */
main {
  padding-top: 5rem; /* topnav height */
}

/* ============================================================
   Hero Banner
   ============================================================ */
.category-hero {
  position: relative;
  height: 380px;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}
.category-hero-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}
.category-hero-bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.category-hero-bg-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(to right, rgba(252,249,241,0.85) 0%, rgba(252,249,241,0.35) 50%, transparent 100%);
}
.category-hero-inner {
  position: relative;
  z-index: 10;
  max-width: 80rem;
  margin: 0 auto;
  padding: 0 2rem;
  width: 100%;
}
.category-hero-badge {
  display: inline-block;
  padding: 0.25rem 0.75rem;
  margin-bottom: 1rem;
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--tertiary);
  background: rgba(156,172,107,0.25);
  border-radius: var(--radius-full);
}
.category-hero h1 {
  font-family: var(--font-headline);
  font-weight: 800;
  font-size: clamp(2.25rem, 5.5vw, 3.5rem);
  color: var(--on-surface);
  letter-spacing: -0.025em;
  margin-bottom: 1rem;
}
.category-hero p {
  font-size: 1.125rem;
  color: var(--on-surface-variant);
  line-height: 1.75;
  max-width: 36rem;
}

/* ============================================================
   Content Shell
   ============================================================ */
.category-shell {
  max-width: 80rem;
  margin: 0 auto;
  padding: 0 2rem 6rem;
  margin-top: -2.5rem;
  position: relative;
  z-index: 20;
}

/* ============================================================
   Sub-Category Card Grid（子栏目封面卡片网格）
   ============================================================ */
.category-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
}
@media (min-width: 640px) {
  .category-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}
@media (min-width: 1024px) {
  .category-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}
@media (min-width: 1280px) {
  .category-grid {
    grid-template-columns: repeat(4, 1fr);
  }
}

/* ---------- 卡片 ---------- */
.category-card {
  background: var(--surface-container-lowest);
  border-radius: var(--radius-2xl);
  overflow: hidden;
  box-shadow: 0 2px 12px rgba(28, 28, 23, 0.05);
  border: 1px solid rgba(209, 197, 180, 0.1);
  transition: transform 0.35s cubic-bezier(0.4,0,0.2,1), box-shadow 0.35s;
  text-decoration: none;
  color: inherit;
  display: flex;
  flex-direction: column;
}
.category-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 20px 48px rgba(165, 137, 72, 0.12);
}

/* 图片区 */
.category-card-img {
  height: 180px;
  position: relative;
  overflow: hidden;
  background: var(--surface-container);
}
.category-card-img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.6s;
}
.category-card:hover .category-card-img img {
  transform: scale(1.06);
}

/* 无图片时的占位 */
.category-card-placeholder {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, var(--surface-container) 0%, rgba(197,160,89,0.08) 100%);
}
.category-card-placeholder .material-symbols-outlined {
  font-size: 3rem;
  color: var(--outline-variant);
}

/* 文章计数角标 */
.category-card-count {
  position: absolute;
  bottom: 0.75rem;
  right: 0.75rem;
  padding: 0.2rem 0.75rem;
  background: rgba(0,0,0,0.55);
  color: #fff;
  font-size: 0.75rem;
  font-weight: 600;
  border-radius: var(--radius-full);
  backdrop-filter: blur(4px);
}

/* 文字区 */
.category-card-body {
  padding: 1.5rem 1.75rem;
  flex: 1;
  display: flex;
  flex-direction: column;
}

.category-card-title {
  font-family: var(--font-headline);
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--on-surface);
  margin-bottom: 0.5rem;
  transition: color 0.2s;
}
.category-card:hover .category-card-title {
  color: var(--primary);
}

.category-card-desc {
  font-size: 0.875rem;
  color: var(--on-surface-variant);
  line-height: 1.65;
  flex: 1;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  margin-bottom: 1rem;
}

.category-card-arrow {
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  font-size: 0.875rem;
  font-weight: 600;
  color: var(--primary);
  transition: gap 0.3s;
}
.category-card:hover .category-card-arrow {
  gap: 0.625rem;
}
.category-card-arrow .material-symbols-outlined {
  font-size: 1rem;
  transition: transform 0.3s;
}
.category-card:hover .category-card-arrow .material-symbols-outlined {
  transform: translateX(3px);
}

/* ============================================================
   Article List（无子栏目时显示最新文章）
   ============================================================ */
.category-articles {
  margin-top: 4rem;
}

.category-articles-header {
  margin-bottom: 2.5rem;
  display: flex;
  align-items: center;
  gap: 1.25rem;
}
.category-articles-header h2 {
  font-family: var(--font-headline);
  font-weight: 800;
  font-size: 1.75rem;
  color: var(--on-surface);
  white-space: nowrap;
}
.category-articles-divider {
  flex: 1;
  height: 2px;
  background: rgba(209, 197, 180, 0.3);
}

/* 文章卡片网格 */
.category-articles-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
}
@media (min-width: 768px) {
  .category-articles-grid {
    grid-template-columns: 1fr 1fr;
  }
}
@media (min-width: 1024px) {
  .category-articles-grid {
    grid-template-columns: 1fr 1fr 1fr;
  }
}

.category-article-card {
  background: var(--surface-container-lowest);
  border-radius: var(--radius-xl);
  overflow: hidden;
  box-shadow: 0 2px 8px rgba(0,0,0,0.05);
  transition: box-shadow 0.4s, transform 0.4s;
}
.category-article-card:hover {
  box-shadow: 0 16px 40px rgba(0,0,0,0.1);
  transform: translateY(-3px);
}

.category-article-img {
  height: 14rem;
  overflow: hidden;
}
.category-article-img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.6s;
}
.category-article-card:hover .category-article-img img {
  transform: scale(1.08);
}

.category-article-body {
  padding: 1.5rem;
}

.category-article-date {
  font-size: 0.8rem;
  color: var(--outline);
  display: block;
  margin-bottom: 0.6rem;
}

.category-article-title {
  font-family: var(--font-headline);
  font-weight: 700;
  font-size: 1.1rem;
  line-height: 1.5;
  margin-bottom: 0.75rem;
}
.category-article-title a {
  color: var(--on-surface);
  text-decoration: none;
  transition: color 0.2s;
}
.category-article-title a:hover {
  color: var(--primary);
}

.category-article-excerpt {
  font-size: 0.875rem;
  color: var(--on-surface-variant);
  line-height: 1.65;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}

/* 查看更多 */
.category-articles-more {
  text-align: center;
  margin-top: 3rem;
}

.btn-outline-primary {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.875rem 2.25rem;
  border: 2px solid var(--primary);
  color: var(--primary);
  border-radius: var(--radius-xl);
  font-weight: 700;
  font-size: 0.9375rem;
  text-decoration: none;
  transition: background 0.2s, color 0.2s, box-shadow 0.2s;
}
.btn-outline-primary:hover {
  background: var(--primary);
  color: #fff;
  box-shadow: 0 10px 25px -8px rgba(197, 160, 89, 0.3);
}

/* ============================================================
   Breadcrumb（面包屑，仅无子栏目时显示）
   ============================================================ */
.category-breadcrumb {
  background: var(--surface-container);
  padding: 0.875rem 0;
  border-bottom: 1px solid rgba(209, 197, 180, 0.15);
}
.category-breadcrumb-inner {
  max-width: 80rem;
  margin: 0 auto;
  padding: 0 2rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.875rem;
}
.category-breadcrumb-inner a {
  color: var(--on-surface-variant);
  text-decoration: none;
  transition: color 0.2s;
}
.category-breadcrumb-inner a:hover {
  color: var(--primary);
}
.category-breadcrumb-inner .material-symbols-outlined {
  font-size: 1rem;
  color: var(--outline-variant);
}
.category-breadcrumb-inner .current {
  color: var(--primary);
  font-weight: 600;
}

/* ============================================================
   Responsive
   ============================================================ */
@media (max-width: 639px) {
  .category-hero {
    height: 300px;
  }
  .category-hero h1 {
    font-size: 1.75rem;
  }
  .category-hero p {
    font-size: 0.9375rem;
  }
  .category-hero-bg-overlay {
    background: linear-gradient(to bottom, rgba(252,249,241,0.9) 0%, rgba(252,249,241,0.5) 70%, rgba(252,249,241,0.8) 100%);
  }
  .category-card-img {
    height: 150px;
  }
  .category-articles-grid {
    gap: 1.5rem;
  }
}