/* ============================================
   Skyline Blocks — 城市天际线
   高低错落模块 × 大图文字交替 × 日夜双主题 × 视觉节奏感
   ============================================ */

/* ===== Reset ===== */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; -webkit-text-size-adjust: 100%; }

/* ===== CSS Variables ===== */
:root {
  /* 日间主题 */
  --sky-top: #e8edf5;
  --sky-bottom: #f0f4fa;
  --building-bg: #ffffff;
  --building-bg-alt: #f7f8fc;
  --building-border: rgba(30, 41, 59, 0.08);
  --building-shadow: 0 4px 24px rgba(30, 41, 59, 0.08), 0 1px 4px rgba(30, 41, 59, 0.04);
  --building-shadow-hover: 0 8px 40px rgba(30, 41, 59, 0.14), 0 2px 8px rgba(30, 41, 59, 0.06);
  --text-primary: #0f172a;
  --text-secondary: #475569;
  --text-muted: #94a3b8;
  --accent: #3b82f6;
  --accent-warm: #f59e0b;
  --accent-glow: rgba(59, 130, 246, 0.15);
  --tag-bg: rgba(59, 130, 246, 0.08);
  --tag-border: rgba(59, 130, 246, 0.2);
  --nav-bg: rgba(255, 255, 255, 0.88);
  --nav-border: rgba(30, 41, 59, 0.06);
  --search-bg: rgba(255, 255, 255, 0.96);
  --divider: rgba(30, 41, 59, 0.06);
  --footer-bg: #0f172a;
  --footer-text: rgba(255, 255, 255, 0.6);
  --window-glow: rgba(59, 130, 246, 0.06);
  --hero-gradient: linear-gradient(135deg, #1e293b 0%, #0f172a 100%);
  --hero-text: #ffffff;
  --hero-text-muted: rgba(255, 255, 255, 0.7);
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-heading: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --max-width: 1400px;
}

/* 夜间主题 */
[data-theme="dark"] {
  --sky-top: #0a0e1a;
  --sky-bottom: #0f172a;
  --building-bg: #1e293b;
  --building-bg-alt: #162032;
  --building-border: rgba(148, 163, 184, 0.08);
  --building-shadow: 0 4px 24px rgba(0, 0, 0, 0.3), 0 1px 4px rgba(0, 0, 0, 0.2);
  --building-shadow-hover: 0 8px 40px rgba(0, 0, 0, 0.4), 0 2px 8px rgba(0, 0, 0, 0.3);
  --text-primary: #f1f5f9;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --accent: #60a5fa;
  --accent-warm: #fbbf24;
  --accent-glow: rgba(96, 165, 250, 0.2);
  --tag-bg: rgba(96, 165, 250, 0.1);
  --tag-border: rgba(96, 165, 250, 0.25);
  --nav-bg: rgba(15, 23, 42, 0.92);
  --nav-border: rgba(148, 163, 184, 0.06);
  --search-bg: rgba(15, 23, 42, 0.96);
  --divider: rgba(148, 163, 184, 0.06);
  --footer-bg: #050810;
  --window-glow: rgba(96, 165, 250, 0.12);
  --hero-gradient: linear-gradient(135deg, #0f172a 0%, #020617 100%);
  --hero-text: #f1f5f9;
  --hero-text-muted: rgba(148, 163, 184, 0.8);
}

/* ===== Body ===== */
body {
  font-family: var(--font-body);
  background: var(--sky-top);
  color: var(--text-primary);
  line-height: 1.6;
  min-height: 100vh;
  -webkit-font-smoothing: antialiased;
  transition: background 0.4s, color 0.4s;
}

/* 天际线背景渐变 */
body::before {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(180deg, var(--sky-top) 0%, var(--sky-bottom) 100%);
  z-index: -2;
  transition: background 0.4s;
}

/* 星星点缀（夜间模式） */
body::after {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 40vh;
  z-index: -1;
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.4s;
  background-image:
    radial-gradient(1px 1px at 10% 15%, rgba(255,255,255,0.6), transparent),
    radial-gradient(1px 1px at 25% 8%, rgba(255,255,255,0.4), transparent),
    radial-gradient(1.5px 1.5px at 40% 20%, rgba(255,255,255,0.5), transparent),
    radial-gradient(1px 1px at 55% 5%, rgba(255,255,255,0.3), transparent),
    radial-gradient(1px 1px at 70% 18%, rgba(255,255,255,0.5), transparent),
    radial-gradient(1.5px 1.5px at 85% 12%, rgba(255,255,255,0.4), transparent),
    radial-gradient(1px 1px at 15% 30%, rgba(255,255,255,0.3), transparent),
    radial-gradient(1px 1px at 60% 25%, rgba(255,255,255,0.4), transparent),
    radial-gradient(1px 1px at 90% 28%, rgba(255,255,255,0.3), transparent),
    radial-gradient(1px 1px at 35% 35%, rgba(255,255,255,0.2), transparent);
}
[data-theme="dark"] body::after { opacity: 1; }

/* ===== Navigation ===== */
.sk-nav {
  position: sticky;
  top: 0;
  z-index: 100;
  width: 100%;
  background: var(--nav-bg);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--nav-border);
  transition: background 0.4s, border-color 0.4s;
}
.sk-nav-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  height: 64px;
  display: flex;
  align-items: center;
  padding: 0 32px;
  gap: 24px;
}
.sk-logo {
  display: flex;
  align-items: center;
  gap: 10px;
  text-decoration: none;
  flex-shrink: 0;
}
.sk-logo-mark {
  width: 36px;
  height: 36px;
  background: linear-gradient(135deg, var(--accent), #6366f1);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-family: var(--font-heading);
  font-size: 16px;
  font-weight: 700;
  box-shadow: 0 2px 8px var(--accent-glow);
  transition: transform 0.3s;
}
.sk-logo:hover .sk-logo-mark { transform: scale(1.08); }
.sk-logo-text {
  font-family: var(--font-heading);
  font-size: 18px;
  font-weight: 600;
  color: var(--text-primary);
  letter-spacing: -0.5px;
  transition: color 0.4s;
}
.sk-nav-links {
  display: flex;
  gap: 24px;
  list-style: none;
}
.sk-nav-links a {
  text-decoration: none;
  color: var(--text-secondary);
  font-size: 14px;
  font-weight: 400;
  letter-spacing: 0.3px;
  transition: color 0.2s;
  position: relative;
}
.sk-nav-links a::after {
  content: '';
  position: absolute;
  bottom: -4px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--accent);
  transition: width 0.3s;
}
.sk-nav-links a:hover { color: var(--accent); }
.sk-nav-links a:hover::after { width: 100%; }
.sk-nav-right {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 10px;
}
.sk-theme-toggle {
  width: 36px;
  height: 36px;
  background: none;
  border: 1px solid var(--building-border);
  border-radius: var(--radius-sm);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
  transition: all 0.2s;
  font-size: 16px;
}
.sk-theme-toggle:hover {
  border-color: var(--accent);
  color: var(--accent);
}
.sk-search-btn {
  width: 36px;
  height: 36px;
  background: none;
  border: 1px solid var(--building-border);
  border-radius: var(--radius-sm);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
  transition: all 0.2s;
}
.sk-search-btn:hover {
  border-color: var(--accent);
  color: var(--accent);
}
.sk-search-btn svg { width: 16px; height: 16px; }
.sk-mobile-menu-btn {
  display: none;
  width: 36px;
  height: 36px;
  background: none;
  border: 1px solid var(--building-border);
  border-radius: var(--radius-sm);
  cursor: pointer;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 4px;
  padding: 8px;
}
.sk-mobile-menu-btn span {
  display: block;
  width: 100%;
  height: 1.5px;
  background: var(--text-secondary);
  border-radius: 1px;
  transition: all 0.3s;
}

/* ===== Search Overlay ===== */
.sk-search-overlay {
  position: fixed;
  inset: 0;
  z-index: 200;
  background: rgba(15, 23, 42, 0.5);
  backdrop-filter: blur(8px);
  display: flex;
  align-items: flex-start;
  justify-content: center;
  padding-top: 12vh;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s;
}
.sk-search-overlay.active {
  opacity: 1;
  pointer-events: all;
}
.sk-search-overlay-inner {
  width: 100%;
  max-width: 600px;
  background: var(--search-bg);
  border: 1px solid var(--building-border);
  border-radius: var(--radius-lg);
  padding: 24px;
  position: relative;
  max-height: 70vh;
  overflow-y: auto;
  box-shadow: var(--building-shadow-hover);
}
.sk-search-close {
  position: absolute;
  top: 12px;
  right: 16px;
  font-size: 24px;
  background: none;
  border: none;
  cursor: pointer;
  color: var(--text-muted);
  line-height: 1;
}
.sk-search-close:hover { color: var(--text-primary); }
.sk-search-box {
  display: flex;
  align-items: center;
  gap: 12px;
  border-bottom: 1px solid var(--divider);
  padding-bottom: 16px;
  margin-bottom: 16px;
}
.sk-search-box svg {
  width: 20px;
  height: 20px;
  color: var(--text-muted);
  flex-shrink: 0;
}
.sk-search-input {
  width: 100%;
  border: none;
  outline: none;
  font-size: 16px;
  font-family: var(--font-body);
  background: transparent;
  color: var(--text-primary);
}
.sk-search-input::placeholder { color: var(--text-muted); }
.sk-search-results { display: flex; flex-direction: column; gap: 4px; }
.sk-search-result-item {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 10px 8px;
  border-radius: var(--radius-sm);
  text-decoration: none;
  color: inherit;
  transition: background 0.2s;
}
.sk-search-result-item:hover { background: var(--tag-bg); }
.sk-search-result-thumb {
  width: 56px;
  height: 40px;
  border-radius: var(--radius-sm);
  overflow: hidden;
  flex-shrink: 0;
  background: var(--building-bg-alt);
}
.sk-search-result-thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.sk-search-result-info { flex: 1; min-width: 0; }
.sk-search-result-cat {
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 2px;
}
.sk-search-result-title {
  font-size: 14px;
  line-height: 1.4;
  color: var(--text-primary);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.sk-search-empty {
  text-align: center;
  padding: 24px;
  color: var(--text-muted);
  font-size: 14px;
}

/* ===== Hero — 摩天大楼式精选 ===== */
.sk-hero {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 40px 32px 0;
}
.sk-hero-card {
  display: block;
  text-decoration: none;
  color: inherit;
  background: var(--hero-gradient);
  border-radius: var(--radius-xl);
  overflow: hidden;
  box-shadow: 0 8px 48px rgba(15, 23, 42, 0.2);
  transition: transform 0.4s, box-shadow 0.4s;
  position: relative;
}
.sk-hero-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 16px 64px rgba(15, 23, 42, 0.3);
}
.sk-hero-card-inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  min-height: 480px;
}
.sk-hero-card-img {
  position: relative;
  overflow: hidden;
}
.sk-hero-card-img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.6s;
}
.sk-hero-card:hover .sk-hero-card-img img {
  transform: scale(1.04);
}
.sk-hero-card-img::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, transparent 60%, rgba(15, 23, 42, 0.8) 100%);
}
.sk-hero-card-body {
  padding: 48px 48px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  position: relative;
  z-index: 2;
}
/* 窗户灯光效果 */
.sk-hero-card-body::before {
  content: '';
  position: absolute;
  top: 20px;
  right: 20px;
  width: 80px;
  height: 120px;
  background-image:
    linear-gradient(180deg,
      var(--window-glow) 0px,
      transparent 0px,
      var(--window-glow) 8px,
      transparent 8px,
      transparent 12px,
      var(--window-glow) 12px,
      transparent 20px,
      transparent 24px,
      var(--window-glow) 24px,
      transparent 32px,
      transparent 36px,
      var(--window-glow) 36px,
      transparent 44px,
      transparent 48px,
      var(--window-glow) 48px,
      transparent 56px
    );
  background-size: 12px 8px;
  opacity: 0.5;
  pointer-events: none;
}
.sk-hero-label {
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 3px;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 20px;
  display: flex;
  align-items: center;
  gap: 10px;
}
.sk-hero-label::before {
  content: '';
  width: 24px;
  height: 2px;
  background: var(--accent);
}
.sk-hero-card-tag {
  display: inline-block;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--accent);
  border: 1px solid rgba(96, 165, 250, 0.3);
  padding: 4px 12px;
  border-radius: 2px;
  margin-bottom: 20px;
  width: fit-content;
}
.sk-hero-card-title {
  font-family: var(--font-heading);
  font-size: 32px;
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.5px;
  color: var(--hero-text);
  margin-bottom: 16px;
}
.sk-hero-card-excerpt {
  font-size: 15px;
  line-height: 1.7;
  color: var(--hero-text-muted);
  margin-bottom: 28px;
  display: -webkit-box;
  -webkit-line-clamp: 4;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.sk-hero-card-cta {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--accent);
  transition: gap 0.2s;
}
.sk-hero-card-cta svg { width: 16px; height: 16px; }
.sk-hero-card:hover .sk-hero-card-cta { gap: 14px; }

/* ===== 天际线分隔线 ===== */
.sk-skyline-divider {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 32px;
  position: relative;
  height: 48px;
  display: flex;
  align-items: center;
}
.sk-skyline-divider-line {
  width: 100%;
  height: 1px;
  background: linear-gradient(90deg,
    transparent 0%,
    var(--divider) 15%,
    var(--divider) 85%,
    transparent 100%
  );
}
/* 天际线剪影装饰 */
.sk-skyline-divider::before {
  content: '';
  position: absolute;
  bottom: 0;
  left: 32px;
  right: 32px;
  height: 20px;
  background-image:
    linear-gradient(90deg,
      transparent 0%,
      var(--building-border) 0%,
      var(--building-border) 2px,
      transparent 2px,
      transparent 8px,
      var(--building-border) 8px,
      var(--building-border) 9px,
      transparent 9px,
      transparent 20px,
      var(--building-border) 20px,
      var(--building-border) 22px,
      transparent 22px,
      transparent 30px,
      var(--building-border) 30px,
      var(--building-border) 31px,
      transparent 31px,
      transparent 45px,
      var(--building-border) 45px,
      var(--building-border) 48px,
      transparent 48px
    );
  background-size: 60px 20px;
  background-repeat: repeat-x;
  opacity: 0.4;
}

/* ===== 区块标题 ===== */
.sk-section {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 32px;
}
.sk-section-header {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  margin-bottom: 28px;
  padding-top: 40px;
}
.sk-section-label {
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 3px;
  text-transform: uppercase;
  color: var(--accent);
  display: flex;
  align-items: center;
  gap: 12px;
}
.sk-section-label::before {
  content: '';
  width: 20px;
  height: 2px;
  background: var(--accent);
}
.sk-section-title {
  font-family: var(--font-heading);
  font-size: 28px;
  font-weight: 700;
  letter-spacing: -0.5px;
  color: var(--text-primary);
  margin-top: 6px;
  transition: color 0.4s;
}
.sk-section-more {
  font-size: 13px;
  color: var(--accent);
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 6px;
  transition: gap 0.2s;
  font-weight: 500;
}
.sk-section-more:hover { gap: 10px; }
.sk-section-more svg { width: 14px; height: 14px; }

/* ===== 天际线网格 — 高低错落的建筑群 ===== */
.sk-skyline-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

/* 不同高度的建筑块 */
.sk-building {
  background: var(--building-bg);
  border: 1px solid var(--building-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  text-decoration: none;
  color: inherit;
  transition: transform 0.35s cubic-bezier(0.25, 0.46, 0.45, 0.94), box-shadow 0.35s;
  box-shadow: var(--building-shadow);
  position: relative;
}
.sk-building:hover {
  transform: translateY(-6px);
  box-shadow: var(--building-shadow-hover);
}

/* 建筑高度变体 — 模拟天际线高低错落 */
.sk-building--tall { grid-row: span 2; }
.sk-building--medium { }
.sk-building--short { }

/* 建筑顶部灯光效果 */
.sk-building::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--accent), var(--accent-warm));
  opacity: 0;
  transition: opacity 0.3s;
  z-index: 3;
}
.sk-building:hover::before { opacity: 1; }

/* 建筑图片区 */
.sk-building-img {
  position: relative;
  overflow: hidden;
  background: var(--building-bg-alt);
}
.sk-building--tall .sk-building-img { aspect-ratio: 4/3; }
.sk-building--medium .sk-building-img { aspect-ratio: 16/9; }
.sk-building--short .sk-building-img { aspect-ratio: 16/9; }
.sk-building-img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s;
}
.sk-building:hover .sk-building-img img {
  transform: scale(1.06);
}
.sk-building-img::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 40%;
  background: linear-gradient(to top, rgba(0,0,0,0.5) 0%, transparent 100%);
  pointer-events: none;
}

/* 图片上的分类标签 */
.sk-building-tag {
  position: absolute;
  top: 12px;
  left: 12px;
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: #fff;
  background: rgba(0, 0, 0, 0.45);
  backdrop-filter: blur(8px);
  padding: 4px 10px;
  border-radius: 4px;
  z-index: 2;
}

/* 建筑信息区 */
.sk-building-body {
  padding: 16px 18px 20px;
}
.sk-building--tall .sk-building-body { padding: 20px 22px 24px; }
.sk-building-title {
  font-family: var(--font-heading);
  font-size: 15px;
  font-weight: 600;
  line-height: 1.35;
  color: var(--text-primary);
  margin-bottom: 8px;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
  transition: color 0.4s;
}
.sk-building--tall .sk-building-title {
  font-size: 18px;
  -webkit-line-clamp: 4;
}
.sk-building-excerpt {
  font-size: 13px;
  line-height: 1.6;
  color: var(--text-secondary);
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
  transition: color 0.4s;
}
.sk-building--tall .sk-building-excerpt {
  -webkit-line-clamp: 5;
  font-size: 14px;
}
.sk-building-read {
  margin-top: 14px;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--accent);
  display: flex;
  align-items: center;
  gap: 6px;
  transition: gap 0.2s;
}
.sk-building-read svg { width: 12px; height: 12px; }
.sk-building:hover .sk-building-read { gap: 10px; }

/* ===== 大图文字交替行 ===== */
.sk-alternating-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 20px;
  margin-bottom: 20px;
}
.sk-alternating-row.reverse { direction: rtl; }
.sk-alternating-row.reverse > * { direction: ltr; }

.sk-alt-building {
  background: var(--building-bg);
  border: 1px solid var(--building-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  text-decoration: none;
  color: inherit;
  transition: transform 0.35s, box-shadow 0.35s;
  box-shadow: var(--building-shadow);
  display: flex;
  flex-direction: column;
}
.sk-alt-building:hover {
  transform: translateY(-4px);
  box-shadow: var(--building-shadow-hover);
}
.sk-alt-building-img {
  position: relative;
  overflow: hidden;
  aspect-ratio: 16/9;
  background: var(--building-bg-alt);
}
.sk-alt-building-img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s;
}
.sk-alt-building:hover .sk-alt-building-img img {
  transform: scale(1.04);
}
.sk-alt-building-body {
  padding: 20px 24px 24px;
  flex: 1;
  display: flex;
  flex-direction: column;
}
.sk-alt-building-tag {
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 10px;
}
.sk-alt-building-title {
  font-family: var(--font-heading);
  font-size: 20px;
  font-weight: 700;
  line-height: 1.25;
  color: var(--text-primary);
  margin-bottom: 10px;
  letter-spacing: -0.3px;
  transition: color 0.4s;
}
.sk-alt-building-excerpt {
  font-size: 14px;
  line-height: 1.65;
  color: var(--text-secondary);
  flex: 1;
  display: -webkit-box;
  -webkit-line-clamp: 3;
  -webkit-box-orient: vertical;
  overflow: hidden;
}
.sk-alt-building-read {
  margin-top: 16px;
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: var(--accent);
  display: flex;
  align-items: center;
  gap: 6px;
  transition: gap 0.2s;
}
.sk-alt-building-read svg { width: 14px; height: 14px; }
.sk-alt-building:hover .sk-alt-building-read { gap: 10px; }

/* ===== 紧凑横排 — 矮建筑群 ===== */
.sk-row-scroll {
  display: flex;
  gap: 18px;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  -webkit-overflow-scrolling: touch;
  padding-bottom: 8px;
  scrollbar-width: thin;
  scrollbar-color: var(--accent) transparent;
}
.sk-row-scroll::-webkit-scrollbar { height: 4px; }
.sk-row-scroll::-webkit-scrollbar-track { background: transparent; }
.sk-row-scroll::-webkit-scrollbar-thumb {
  background: var(--accent);
  border-radius: 2px;
}

.sk-compact-building {
  flex-shrink: 0;
  width: 260px;
  scroll-snap-align: start;
  background: var(--building-bg);
  border: 1px solid var(--building-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  text-decoration: none;
  color: inherit;
  transition: transform 0.3s, box-shadow 0.3s;
  box-shadow: var(--building-shadow);
}
.sk-compact-building:hover {
  transform: translateY(-4px);
  box-shadow: var(--building-shadow-hover);
}
.sk-compact-building-img {
  aspect-ratio: 16/9;
  overflow: hidden;
  background: var(--building-bg-alt);
  position: relative;
}
.sk-compact-building-img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.4s;
}
.sk-compact-building:hover .sk-compact-building-img img {
  transform: scale(1.06);
}
.sk-compact-building-img::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 30%;
  background: linear-gradient(to top, rgba(0,0,0,0.4) 0%, transparent 100%);
}
.sk-compact-building-tag {
  position: absolute;
  top: 8px;
  left: 8px;
  font-size: 9px;
  font-weight: 600;
  letter-spacing: 1.5px;
  text-transform: uppercase;
  color: #fff;
  background: rgba(0, 0, 0, 0.4);
  backdrop-filter: blur(6px);
  padding: 3px 8px;
  border-radius: 3px;
  z-index: 2;
}
.sk-compact-building-body {
  padding: 12px 14px 14px;
}
.sk-compact-building-title {
  font-size: 13px;
  font-weight: 600;
  line-height: 1.35;
  color: var(--text-primary);
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  transition: color 0.4s;
}

/* ===== Ad Slot ===== */
.sk-ad-slot {
  text-align: center;
  padding: 24px 32px;
  display: flex;
  justify-content: center;
}

/* ===== Footer ===== */
.sk-footer {
  background: var(--footer-bg);
  color: var(--footer-text);
  margin-top: 64px;
  transition: background 0.4s;
}
.sk-footer-inner {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 56px 32px 32px;
}
.sk-footer-top {
  display: grid;
  grid-template-columns: 2fr 1fr 1fr;
  gap: 48px;
  margin-bottom: 40px;
}
.sk-footer-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 12px;
}
.sk-footer-brand-mark {
  width: 28px;
  height: 28px;
  background: linear-gradient(135deg, var(--accent), #6366f1);
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-family: var(--font-heading);
  font-size: 14px;
  font-weight: 700;
}
.sk-footer-brand-text {
  font-family: var(--font-heading);
  font-size: 16px;
  font-weight: 600;
  color: #fff;
}
.sk-footer-desc {
  font-size: 14px;
  line-height: 1.7;
  color: rgba(255, 255, 255, 0.4);
}
.sk-footer-heading {
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.3);
  margin-bottom: 16px;
}
.sk-footer-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.sk-footer-links a {
  color: rgba(255, 255, 255, 0.5);
  text-decoration: none;
  font-size: 14px;
  transition: color 0.2s;
}
.sk-footer-links a:hover { color: #fff; }
.sk-footer-bottom {
  padding-top: 24px;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  font-size: 13px;
  color: rgba(255, 255, 255, 0.25);
}

/* ===== Detail Page ===== */
.sk-detail {
  max-width: 860px;
  margin: 0 auto;
  padding: 32px 32px 80px;
}
.sk-detail-back { margin-bottom: 24px; }
.sk-back-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--accent);
  text-decoration: none;
  font-size: 14px;
  font-weight: 500;
  transition: gap 0.2s;
}
.sk-back-link:hover { gap: 12px; }
.sk-back-link svg { width: 16px; height: 16px; }
.sk-detail-hero-img {
  width: 100%;
  max-height: 480px;
  object-fit: cover;
  border-radius: var(--radius-xl);
  margin-bottom: 32px;
  box-shadow: var(--building-shadow);
}
.sk-detail-tag {
  display: inline-block;
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 2px;
  text-transform: uppercase;
  color: var(--accent);
  border: 1px solid var(--tag-border);
  padding: 4px 12px;
  border-radius: 2px;
  margin-bottom: 16px;
}
.sk-detail-title {
  font-family: var(--font-heading);
  font-size: 36px;
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.5px;
  color: var(--text-primary);
  margin-bottom: 24px;
}
.sk-detail-body {
  font-size: 16px;
  line-height: 1.85;
  color: var(--text-secondary);
}
.sk-detail-body p { margin-bottom: 18px; }
.sk-detail-body strong { color: var(--text-primary); font-weight: 600; }
.sk-detail-body h2, .sk-detail-body h3 {
  font-family: var(--font-heading);
  color: var(--text-primary);
  margin-top: 32px;
  margin-bottom: 12px;
  font-weight: 600;
}
.sk-detail-body h2 { font-size: 22px; }
.sk-detail-body h3 { font-size: 18px; }
.sk-detail-body ul, .sk-detail-body ol { margin: 12px 0 12px 24px; }
.sk-detail-body li { margin-bottom: 6px; }
.sk-detail-body a { color: var(--accent); text-decoration: underline; text-underline-offset: 2px; }
.sk-detail-media {
  margin: 32px 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--building-shadow);
}
.sk-detail-media img { width: 100%; display: block; }

/* ===== Related Section ===== */
.sk-related {
  margin-top: 56px;
  padding-top: 40px;
  border-top: 1px solid var(--divider);
}
.sk-related-title {
  font-family: var(--font-heading);
  font-size: 18px;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 24px;
}
.sk-related-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 18px;
}
.sk-related-card {
  background: var(--building-bg);
  border: 1px solid var(--building-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  text-decoration: none;
  color: inherit;
  transition: transform 0.3s, box-shadow 0.3s;
}
.sk-related-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--building-shadow-hover);
}
.sk-related-card-img {
  width: 100%;
  aspect-ratio: 16/9;
  overflow: hidden;
  background: var(--building-bg-alt);
}
.sk-related-card-img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.4s;
}
.sk-related-card:hover .sk-related-card-img img {
  transform: scale(1.04);
}
.sk-related-card-title {
  padding: 12px 14px;
  font-size: 13px;
  font-weight: 500;
  line-height: 1.4;
  color: var(--text-primary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

/* ===== Static Page ===== */
.sk-static {
  max-width: 860px;
  margin: 0 auto;
  padding: 32px 32px 80px;
}
.sk-static-title {
  font-family: var(--font-heading);
  font-size: 32px;
  font-weight: 700;
  letter-spacing: -0.5px;
  color: var(--text-primary);
  margin-bottom: 32px;
}
.sk-static-content {
  background: var(--building-bg);
  border: 1px solid var(--building-border);
  border-radius: var(--radius-lg);
  padding: 32px;
  color: var(--text-secondary);
  line-height: 1.85;
  font-size: 15px;
  box-shadow: var(--building-shadow);
}
.sk-static-content p { margin-bottom: 14px; }
.sk-static-content strong { color: var(--text-primary); font-weight: 600; }
.sk-static-content a { color: var(--accent); text-decoration: underline; }
.sk-static-content h2, .sk-static-content h3 {
  color: var(--text-primary);
  margin-top: 24px;
  margin-bottom: 10px;
  font-weight: 600;
}

/* ===== 滚动显示动画 ===== */
.sk-reveal {
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.6s ease, transform 0.6s ease;
}
.sk-reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* ===== 响应式 ===== */
@media (max-width: 1200px) {
  .sk-skyline-grid { grid-template-columns: repeat(3, 1fr); }
  .sk-related-grid { grid-template-columns: repeat(3, 1fr); }
}

@media (max-width: 1024px) {
  .sk-hero-card-inner { grid-template-columns: 1fr; min-height: auto; }
  .sk-hero-card-img { aspect-ratio: 16/9; }
  .sk-hero-card-body { padding: 32px; }
  .sk-skyline-grid { grid-template-columns: repeat(2, 1fr); }
  .sk-alternating-row { grid-template-columns: 1fr; }
  .sk-footer-top { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 768px) {
  .sk-nav-inner { padding: 0 20px; }
  .sk-nav-links { display: none; }
  .sk-mobile-menu-btn { display: flex; }
  .sk-hero { padding: 24px 20px 0; }
  .sk-hero-card-title { font-size: 24px; }
  .sk-hero-card-body { padding: 24px; }
  .sk-section { padding: 0 20px; }
  .sk-skyline-grid { grid-template-columns: 1fr 1fr; gap: 14px; }
  .sk-building--tall { grid-row: span 1; }
  .sk-alt-building-title { font-size: 17px; }
  .sk-footer-top { grid-template-columns: 1fr; gap: 32px; }
  .sk-related-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 640px) {
  .sk-skyline-grid { grid-template-columns: 1fr; }
  .sk-compact-building { width: 220px; }
  .sk-hero-card-title { font-size: 20px; }
  .sk-section-title { font-size: 22px; }
  .sk-detail-title { font-size: 28px; }
  .sk-detail-body { font-size: 15px; }
  .sk-related-grid { grid-template-columns: 1fr 1fr; gap: 12px; }
}