/* 分类子页专用样式 */

/* ── Hero 区域 ────────────────────────────────────── */
.cat-hero {
  position: relative;
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 1.5rem;
  min-height: 55vh;
  padding: clamp(3rem, 8vw, 6rem) clamp(1.5rem, 5vw, 4rem);
  overflow: hidden;
  background: var(--bg-paper);
}

/* 与主页「四大建筑主题」卡片使用相同底图 */
.cat-hero-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
  background-size: cover;
  background-position: center;
  transition: transform 0.8s cubic-bezier(0.22, 1, 0.36, 1);
}

.cat-hero:hover .cat-hero-bg {
  transform: scale(1.04);
}

.cat-hero-overlay {
  position: absolute;
  inset: 0;
  z-index: 1;
  pointer-events: none;
  background: linear-gradient(
    120deg,
    rgba(250, 248, 243, 0.9) 0%,
    rgba(250, 248, 243, 0.5) 38%,
    rgba(26, 26, 26, 0.22) 100%
  );
}

.cat-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 2;
  background: repeating-linear-gradient(
    90deg,
    transparent,
    transparent 39px,
    rgba(26, 26, 26, 0.028) 39px,
    rgba(26, 26, 26, 0.028) 40px
  );
  pointer-events: none;
}

.cat-hero-body {
  position: relative;
  z-index: 3;
  max-width: 36rem;
}

.cat-eyebrow {
  display: inline-block;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.2em;
  color: var(--ink-muted);
  text-transform: uppercase;
  margin-bottom: 0.75rem;
  animation: fade-up 0.7s var(--ease-out) both;
}

.cat-title {
  margin: 0 0 1rem;
  font-family: var(--font-serif);
  font-size: clamp(2rem, 5vw, 3rem);
  font-weight: 700;
  letter-spacing: 0.05em;
  line-height: 1.2;
  animation: fade-up 0.8s var(--ease-out) 0.1s both;
}

.cat-lead {
  margin: 0 0 1.25rem;
  font-size: clamp(0.95rem, 1.8vw, 1.05rem);
  color: var(--ink-muted);
  line-height: 1.7;
  animation: fade-up 0.8s var(--ease-out) 0.2s both;
}

.cat-tags {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  animation: fade-up 0.8s var(--ease-out) 0.28s both;
}

.cat-tags li {
  padding: 0.3rem 0.75rem;
  font-size: 0.78rem;
  background: var(--bg-paper);
  border: 1px solid rgba(26, 26, 26, 0.1);
  border-radius: 999px;
  color: var(--ink-muted);
}

.cat-hero-badge {
  position: relative;
  z-index: 3;
  font-family: var(--font-serif);
  font-size: clamp(5rem, 12vw, 9rem);
  font-weight: 700;
  color: rgba(26, 26, 26, 0.04);
  letter-spacing: -0.02em;
  user-select: none;
  line-height: 1;
  align-self: center;
  flex-shrink: 0;
}

/* ── 简介区 ────────────────────────────────────── */
.cat-intro {
  padding: clamp(2.5rem, 6vw, 4rem) clamp(1.5rem, 5vw, 4rem);
  background: var(--bg-card);
  border-top: 1px solid rgba(26, 26, 26, 0.05);
  border-bottom: 1px solid rgba(26, 26, 26, 0.05);
}

.cat-intro-inner {
  max-width: 44rem;
  margin: 0 auto;
}

.cat-intro h2 {
  margin: 0 0 1rem;
  font-family: var(--font-serif);
  font-size: clamp(1.25rem, 2.5vw, 1.55rem);
  letter-spacing: 0.05em;
}

.cat-intro p {
  margin: 0;
  font-size: 0.95rem;
  color: var(--ink-muted);
  line-height: 1.75;
}

.cat-intro strong {
  color: var(--ink);
  font-weight: 600;
}

/* ── 案例卡片 ────────────────────────────────────── */
.cat-cases {
  padding: clamp(2.5rem, 6vw, 4rem) clamp(1rem, 5vw, 3rem);
  max-width: 74rem;
  margin: 0 auto;
}

.cat-cases-head {
  text-align: center;
  margin-bottom: 2.5rem;
}

.cat-cases-head h2 {
  margin: 0 0 0.4rem;
  font-family: var(--font-serif);
  font-size: clamp(1.4rem, 2.8vw, 1.75rem);
  letter-spacing: 0.06em;
}

.cat-cases-head p {
  margin: 0;
  font-size: 0.9rem;
  color: var(--ink-muted);
}

.case-grid {
  display: grid;
  gap: 1.5rem;
  grid-template-columns: 1fr;
  grid-auto-rows: 1fr;
}

.case-card {
  --accent: var(--c-government);
  display: grid;
  grid-template-columns: 1fr;
  grid-template-rows: 220px 1fr; 
  background: var(--bg-card);
  border-radius: 12px;
  border: 1px solid rgba(26, 26, 26, 0.06);
  overflow: hidden;
  box-shadow: 0 4px 20px rgba(26, 26, 26, 0.05);
  transition: transform 0.35s var(--ease-out), box-shadow 0.35s var(--ease-out);
  animation: card-in 0.7s var(--ease-out) both;
}

.case-card-link {
  text-decoration: none;
  color: inherit;
}

.case-card:nth-child(1) { animation-delay: 0.04s; }
.case-card:nth-child(2) { animation-delay: 0.1s; }
.case-card:nth-child(3) { animation-delay: 0.16s; }
.case-card:nth-child(4) { animation-delay: 0.22s; }
.case-card:nth-child(5) { animation-delay: 0.28s; }
.case-card:nth-child(6) { animation-delay: 0.34s; }

.case-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 14px 42px rgba(26, 26, 26, 0.1);
}

.case-img-wrap {
  position: relative;
  height: 100%;
  overflow: hidden;
  background: var(--bg-paper);
}

.case-img-wrap img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
  display: block;
  transition: transform 0.5s var(--ease-out);
}

.case-card:hover .case-img-wrap img {
  transform: scale(1.04);
}

.case-region {
  position: absolute;
  bottom: 0.75rem;
  right: 0.75rem;
  padding: 0.3rem 0.65rem;
  font-size: 0.72rem;
  font-weight: 500;
  background: rgba(247, 245, 240, 0.88);
  backdrop-filter: blur(6px);
  border-radius: 4px;
  color: var(--ink);
  letter-spacing: 0.04em;
}

.case-body {
  padding: 1.25rem 1.4rem 1.5rem;
  border-top: 3px solid var(--accent);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
}

.case-tag {
  display: inline-block;
  font-size: 0.73rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  color: var(--accent);
  text-transform: uppercase;
  margin-bottom: 0.4rem;
}

.case-card h3 {
  margin: 0 0 0.35rem;
  font-family: var(--font-serif);
  font-size: 1.2rem;
  letter-spacing: 0.04em;
}

.case-era {
  margin: 0 0 0.65rem;
  font-size: 0.8rem;
  color: var(--ink-muted);
  font-style: italic;
}

.case-card > .case-body > p {
  margin: 0 0 1rem;
  font-size: 0.88rem;
  color: var(--ink-muted);
  line-height: 1.7;
}

.case-features {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
}

.case-features span {
  flex-shrink: 0;
  padding: 0.2rem 0.6rem;
  font-size: 0.72rem;
  background: rgba(26, 26, 26, 0.05);
  border-radius: 999px;
  color: var(--ink-muted);
}

/* ── 构件解析区 ────────────────────────────────────── */
.cat-structure {
  max-width: 46rem;
  margin: 0 auto;
  padding: clamp(2.5rem, 6vw, 4rem) clamp(1rem, 5vw, 3rem);
}

.cat-structure h2 {
  margin: 0 0 1.75rem;
  font-family: var(--font-serif);
  font-size: clamp(1.3rem, 2.5vw, 1.6rem);
  letter-spacing: 0.06em;
  text-align: center;
}

.structure-list {
  display: grid;
  gap: 1.25rem;
}

.structure-list dl {
  margin: 0;
  padding: 1.1rem 1.3rem;
  background: var(--bg-card);
  border-radius: 10px;
  border-left: 3px solid var(--ink-muted);
  display: grid;
  gap: 0.35rem;
  transition: border-color 0.2s, background 0.2s;
}

.structure-list dl:hover {
  border-left-color: var(--gold);
  background: var(--bg-paper);
}

.structure-list dt {
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: 0.95rem;
  letter-spacing: 0.04em;
}

.structure-list dd {
  margin: 0;
  font-size: 0.875rem;
  color: var(--ink-muted);
  line-height: 1.65;
}

/* ── 跨类导航 ────────────────────────────────────── */
.cat-nav-links {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.85rem;
  max-width: 68rem;
  margin: 0 auto;
  padding: 0 clamp(1rem, 5vw, 3rem) clamp(3rem, 6vw, 5rem);
}

.cat-nav-card {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 1rem 1.25rem;
  background: var(--bg-card);
  border-radius: 10px;
  border: 1px solid rgba(26, 26, 26, 0.06);
  text-decoration: none;
  color: var(--ink);
  transition: background 0.25s var(--ease-out), border-color 0.25s;
}

.cat-nav-card:hover {
  background: var(--bg-paper);
  border-color: rgba(26, 26, 26, 0.14);
}

.cat-nav-label {
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--link-accent, var(--ink-muted));
  flex-shrink: 0;
}

.cat-nav-name {
  flex: 1;
  font-size: 0.9rem;
}

.cat-nav-arrow {
  font-size: 1.1rem;
  color: var(--link-accent, var(--ink-muted));
  flex-shrink: 0;
  transition: transform 0.25s var(--ease-out);
}

.cat-nav-card:hover .cat-nav-arrow {
  transform: translateX(4px);
}

/* ── 导航活跃态 ────────────────────────────────────── */
.site-nav a.active {
  color: var(--ink);
  background: rgba(212, 168, 75, 0.15);
}

/* ── 响应式 ────────────────────────────────────── */
@media (min-width: 640px) {
  .case-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 900px) {
  .site-nav {
    display: flex;
  }

  .nav-toggle {
    display: none;
  }

  .mobile-nav {
    display: none !important;
  }
}

@media (min-width: 1100px) {
  .case-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .cat-nav-links {
    grid-template-columns: repeat(3, 1fr);
  }

  .cat-hero {
    min-height: 60vh;
  }
}

@media (prefers-reduced-motion: reduce) {
  .cat-eyebrow,
  .cat-title,
  .cat-lead,
  .cat-tags,
  .case-card,
  .cat-nav-card .cat-nav-arrow {
    animation: none !important;
    transition: none !important;
  }

  .case-card:hover {
    transform: none;
  }

  .case-card:hover .case-img-wrap img {
    transform: none;
  }

  .cat-hero-bg {
    transition: none !important;
  }

  .cat-hero:hover .cat-hero-bg {
    transform: none;
  }
}