:root {
  --primary-color: #78C950;
  --primary-dark: #5ab840;
  --primary-light: #a8e690;
  --bg-light: #f8f9fa;
  --bg-soft: #f0f5f0;
  --text-primary: #1A1A2E;
  --text-secondary: #4B5563;
  --text-muted: #6B7280;
  --border-color: #E5EAF2;
  --shadow-sm: 0 2px 8px rgba(20,30,60,0.06);
  --shadow-md: 0 8px 24px rgba(20,30,60,0.08);
  --shadow-lg: 0 12px 32px rgba(20,30,60,0.1);
}

.tengzhi-fastener-hero {
  position: relative;
  min-height: 520px;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.tengzhi-fastener-hero-bg {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
}

.tengzhi-fastener-hero-bg::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(135deg, rgba(12, 45, 30, 0.85) 0%, rgba(12, 45, 30, 0.7) 50%, rgba(12, 45, 30, 0.6) 100%);
}

.tengzhi-fastener-hero-content {
  position: relative;
  z-index: 1;
  max-width: 1450px;
  width: 100%;
  padding: 0 24px;
  text-align: center;
}

.tengzhi-fastener-hero-tag {
  display: inline-block;
  padding: 8px 20px;
  background: rgba(120, 201, 80, 0.2);
  border: 1px solid rgba(120, 201, 80, 0.4);
  border-radius: 999px;
  color: #78C950;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 2px;
  margin-bottom: 20px;
}

.tengzhi-fastener-hero-content h1 {
  color: #fff;
  font-size: 44px;
  font-weight: 800;
  line-height: 1.25;
  margin: 0 0 16px;
}

.tengzhi-fastener-hero-sub {
  color: rgba(255, 255, 255, 0.85);
  font-size: 18px;
  line-height: 1.7;
  max-width: 720px;
  margin: 0 auto 32px;
}

.tengzhi-fastener-hero-stats {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 20px;
  flex-wrap: wrap;
  margin-bottom: 36px;
}

.tengzhi-fastener-stat-pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 10px 20px;
  background: rgba(255, 255, 255, 0.1);
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: 999px;
  color: #fff;
  font-size: 14px;
  font-weight: 600;
}

.tengzhi-fastener-stat-value {
  color: #78C950;
  font-weight: 800;
}

.tengzhi-fastener-hero-btns {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
}

.tengzhi-fastener-section {
  padding: 60px 0;
}

.tengzhi-fastener-inner {
  max-width: 1450px;
  width: 100%;
  margin: 0 auto;
  padding: 0 24px;
}

.tengzhi-fastener-white {
  background: #fff;
}

.tengzhi-fastener-soft {
  background: #fafbfc;
}

.tengzhi-fastener-insight-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 48px;
  align-items: center;
}

.tengzhi-fastener-head {
  margin-bottom: 24px;
}

.tengzhi-fastener-pill {
  display: inline-block;
  padding: 6px 16px;
  background: rgba(120, 201, 80, 0.1);
  color: #78C950;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 1.5px;
  border-radius: 999px;
  margin-bottom: 12px;
}

.tengzhi-fastener-title {
  display: flex;
  align-items: center;
  gap: 16px;
}

.tengzhi-fastener-bar {
  width: 48px;
  height: 4px;
  background: linear-gradient(90deg, #78C950, #5ab840);
  border-radius: 2px;
}

.tengzhi-fastener-title h2 {
  color: #1A1A2E;
  font-size: 32px;
  font-weight: 800;
  margin: 0;
}

.tengzhi-fastener-insight-left p {
  color: #4B5563;
  font-size: 16px;
  line-height: 1.85;
  margin: 0 0 16px;
}

.tengzhi-fastener-insight-left p:last-of-type {
  margin-bottom: 32px;
}

.tengzhi-fastener-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
}

.tengzhi-fastener-cell {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  padding: 20px;
  background: #fafbfc;
  border-radius: 14px;
  transition: all 0.3s ease;
}

.tengzhi-fastener-cell:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 24px rgba(20, 30, 60, 0.06);
}

.tengzhi-fastener-ic {
  width: 48px;
  height: 48px;
  background: linear-gradient(135deg, rgba(120, 201, 80, 0.15), rgba(120, 201, 80, 0.08));
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  color: #78C950;
}

.tengzhi-fastener-ic i {
  width: 22px;
  height: 22px;
}

.tengzhi-fastener-cell-body h4 {
  color: #1A1A2E;
  font-size: 16px;
  font-weight: 700;
  margin: 0 0 6px;
}

.tengzhi-fastener-cell-body p {
  color: #6B7280;
  font-size: 13px;
  line-height: 1.6;
  margin: 0;
}

.tengzhi-fastener-insight-right {
  height: 420px;
  background-size: cover;
  background-position: center;
  border-radius: 20px;
  position: relative;
}

.tengzhi-fastener-insight-right::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(135deg, rgba(120, 201, 80, 0.05) 0%, transparent 50%);
  border-radius: 20px;
}

.tengzhi-fastener-sec-head {
  text-align: center;
  margin-bottom: 48px;
}

.tengzhi-fastener-sec-head h2 {
  color: #1A1A2E;
  font-size: 32px;
  font-weight: 800;
  margin: 12px 0 10px;
}

.tengzhi-fastener-sub {
  color: #6B7280;
  font-size: 15px;
  line-height: 1.6;
  margin: 0;
}

.tengzhi-fastener-pain-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}

.tengzhi-fastener-pain-card {
  display: flex;
  gap: 20px;
  padding: 24px;
  background: #fff;
  border: 1px solid #E5EAF2;
  border-radius: 16px;
  transition: all 0.3s ease;
}

.tengzhi-fastener-pain-card:hover {
  box-shadow: 0 8px 24px rgba(20, 30, 60, 0.06);
  border-color: rgba(120, 201, 80, 0.2);
}

.tengzhi-fastener-pain-left {
  flex: 1;
}

.tengzhi-fastener-pain-header {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 12px;
}

.tengzhi-fastener-pain-icon {
  width: 36px;
  height: 36px;
  background: rgba(0, 109, 86, 0.1);
  border-radius: 10px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #006d56;
  flex-shrink: 0;
}

.tengzhi-fastener-pain-icon i {
  width: 18px;
  height: 18px;
}

.tengzhi-fastener-pain-tag {
  display: inline-flex;
  align-items: center;
  padding: 4px 12px;
  background: rgba(0, 109, 86, 0.1);
  color: #006d56;
  font-size: 11px;
  font-weight: 700;
  border-radius: 999px;
}

.tengzhi-fastener-pain-left h3 {
  color: #1A1A2E;
  font-size: 18px;
  font-weight: 700;
  margin: 0 0 8px;
}

.tengzhi-fastener-pain-left p {
  color: #6B7280;
  font-size: 14px;
  line-height: 1.6;
  margin: 0;
}

.tengzhi-fastener-pain-arrow {
  display: flex;
  align-items: center;
  justify-content: center;
  color: #D1D5DB;
  padding: 0 8px;
}

.tengzhi-fastener-pain-arrow i {
  width: 20px;
  height: 20px;
}

.tengzhi-fastener-pain-right {
  flex: 1;
}

.tengzhi-fastener-answer-tag {
  display: inline-block;
  padding: 4px 12px;
  background: rgba(120, 201, 80, 0.1);
  color: #78C950;
  font-size: 11px;
  font-weight: 700;
  border-radius: 999px;
  margin-bottom: 12px;
}

.tengzhi-fastener-answer-row {
  display: flex;
  align-items: center;
  gap: 8px;
  color: #4B5563;
  font-size: 14px;
  font-weight: 500;
  margin-bottom: 10px;
}

.tengzhi-fastener-answer-row:last-child {
  margin-bottom: 0;
}

.tengzhi-fastener-answer-row i {
  width: 16px;
  height: 16px;
  color: #78C950;
  flex-shrink: 0;
}

.tengzhi-fastener-modules-wrap {
  margin-top: 24px;
}

.tengzhi-fastener-modules-tabs {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 12px;
  margin-bottom: 24px;
}

.tengzhi-fastener-module-tab {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 20px;
  background: #fafbfc;
  border: 2px solid transparent;
  border-radius: 14px;
  text-decoration: none;
  transition: all 0.3s ease;
}

.tengzhi-fastener-module-tab:hover {
  background: #fff;
  border-color: rgba(120, 201, 80, 0.2);
}

.tengzhi-fastener-module-tab.active {
  background: #fff;
  border-color: #78C950;
  box-shadow: 0 4px 16px rgba(120, 201, 80, 0.15);
}

.tengzhi-fastener-module-ic {
  width: 44px;
  height: 44px;
  background: rgba(120, 201, 80, 0.1);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: #78C950;
  flex-shrink: 0;
}

.tengzhi-fastener-module-ic i {
  width: 20px;
  height: 20px;
}

.tengzhi-fastener-module-txt {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.tengzhi-fastener-module-name {
  color: #1A1A2E;
  font-size: 15px;
  font-weight: 700;
}

.tengzhi-fastener-module-desc {
  color: #6B7280;
  font-size: 12px;
}

.tengzhi-fastener-module-show {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 24px;
  padding: 24px;
  background: #fff;
  border: 1px solid #E5EAF2;
  border-radius: 18px;
}

.tengzhi-fastener-module-show[hidden] {
  display: none;
}

.tengzhi-fastener-module-img {
  height: 320px;
  background-size: cover;
  background-position: center;
  border-radius: 14px;
}

.tengzhi-fastener-module-body {
  display: flex;
  flex-direction: column;
}

.tengzhi-fastener-title-row {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  margin-bottom: 16px;
}

.tengzhi-fastener-title-row h3 {
  color: #1A1A2E;
  font-size: 24px;
  font-weight: 800;
  margin: 0 0 8px;
}

.tengzhi-fastener-tag-line {
  color: #6B7280;
  font-size: 14px;
  line-height: 1.6;
  margin: 0;
}

.tengzhi-fastener-more {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 10px 20px;
  background: rgba(120, 201, 80, 0.1);
  color: #78C950;
  font-size: 13px;
  font-weight: 700;
  border-radius: 999px;
  text-decoration: none;
  transition: all 0.3s ease;
}

.tengzhi-fastener-more:hover {
  background: #78C950;
  color: #fff;
}

.tengzhi-fastener-divider {
  height: 1px;
  background: #E5EAF2;
  margin: 20px 0;
}

.tengzhi-fastener-label {
  color: #6B7280;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.5px;
  margin-bottom: 12px;
}

.tengzhi-fastener-chips {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}

.tengzhi-fastener-chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 16px;
  background: #fafbfc;
  border: 1px solid #E5EAF2;
  border-radius: 999px;
  color: #4B5563;
  font-size: 13px;
  font-weight: 500;
}

.tengzhi-fastener-chip i {
  width: 14px;
  height: 14px;
  color: #78C950;
}

@media (max-width: 1180px) {
  .tengzhi-fastener-insight-row {
    grid-template-columns: 1fr;
    gap: 32px;
  }
  
  .tengzhi-fastener-insight-right {
    height: 320px;
  }
  
  .tengzhi-fastener-pain-grid {
    grid-template-columns: 1fr;
  }
  
  .tengzhi-fastener-modules-tabs {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .tengzhi-fastener-module-show {
    grid-template-columns: 1fr;
  }
  
  .tengzhi-fastener-module-img {
    height: 240px;
  }
}

@media (max-width: 860px) {
  .tengzhi-fastener-hero-content h1 {
    font-size: 32px;
  }
  
  .tengzhi-fastener-hero-sub {
    font-size: 16px;
  }
  
  .tengzhi-fastener-title h2 {
    font-size: 26px;
  }
  
  .tengzhi-fastener-sec-head h2 {
    font-size: 26px;
  }
  
  .tengzhi-fastener-grid {
    grid-template-columns: 1fr;
  }
  
  .tengzhi-fastener-pain-card {
    flex-direction: column;
  }
  
  .tengzhi-fastener-pain-arrow {
    transform: rotate(90deg);
    padding: 8px 0;
  }
  
  .tengzhi-fastener-modules-tabs {
    grid-template-columns: 1fr;
  }
  
  .tengzhi-fastener-title-row {
    flex-direction: column;
    gap: 12px;
  }
}

@media (max-width: 520px) {
  .tengzhi-fastener-hero-content h1 {
    font-size: 26px;
  }
  
  .tengzhi-fastener-hero-sub {
    font-size: 14px;
  }
  
  .tengzhi-fastener-inner {
    padding: 0 16px;
  }
  
  .tengzhi-fastener-section {
    padding: 40px 0;
  }
  
  .tengzhi-fastener-hero-stats {
    gap: 12px;
  }
  
  .tengzhi-fastener-stat-pill {
  padding: 8px 14px;
  font-size: 12px;
  }
}

/* Solution Architecture */
.tengzhi-fastener-arch-intro {
  max-width: 940px;
  margin: 0 auto 36px;
  text-align: center;
  color: #4B5563;
  font-size: 15px;
  line-height: 1.85;
}

.tengzhi-fastener-arch-intro strong {
  color: #1A1A2E;
  font-weight: 700;
}

.tengzhi-fastener-arch-diagram {
  display: flex;
  flex-direction: column;
  gap: 22px;
  background: linear-gradient(180deg, #FAFBFD 0%, #F4F7FB 100%);
  border: 1px solid #E5EAF2;
  border-radius: 22px;
  padding: 28px;
  box-shadow: 0 12px 32px rgba(20,30,60,0.05);
}

.tengzhi-fastener-arch-layer {
  background: #fff;
  border: 1px solid #E5EAF2;
  border-radius: 18px;
  padding: 22px 24px;
}

.tengzhi-fastener-arch-layer-head {
  display: flex;
  align-items: center;
  gap: 14px;
  margin-bottom: 18px;
}

.tengzhi-fastener-arch-layer-icon {
  width: 44px;
  height: 44px;
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.tengzhi-fastener-arch-layer-icon i {
  width: 22px;
  height: 22px;
}

.tengzhi-fastener-arch-layer-title {
  flex: 1;
  min-width: 0;
}

.tengzhi-fastener-arch-layer-title h3 {
  color: #1A1A2E;
  font-size: 18px;
  font-weight: 800;
  margin: 0 0 4px;
  letter-spacing: 0.2px;
}

.tengzhi-fastener-arch-layer-title h3 span {
  font-weight: 700;
  font-size: 16px;
  opacity: 0.8;
}

.tengzhi-fastener-arch-layer-title p {
  color: #6B7280;
  font-size: 13px;
  margin: 0;
}

.tengzhi-fastener-arch-layer-tag {
  flex-shrink: 0;
  padding: 5px 12px;
  border-radius: 999px;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 1px;
}

.tengzhi-fastener-arch-layer:first-child .tengzhi-fastener-arch-layer-icon { background: rgba(91,141,239,0.12); color: #4A7BD9; }
.tengzhi-fastener-arch-layer:first-child .tengzhi-fastener-arch-layer-tag { background: rgba(91,141,239,0.12); color: #4A7BD9; }
.tengzhi-fastener-arch-layer:nth-child(2) .tengzhi-fastener-arch-layer-icon { background: rgba(139,111,232,0.12); color: #7B5FE0; }
.tengzhi-fastener-arch-layer:nth-child(2) .tengzhi-fastener-arch-layer-tag { background: rgba(139,111,232,0.12); color: #7B5FE0; }
.tengzhi-fastener-arch-layer:nth-child(3) .tengzhi-fastener-arch-layer-icon { background: rgba(20,181,160,0.13); color: #0FA38E; }
.tengzhi-fastener-arch-layer:nth-child(3) .tengzhi-fastener-arch-layer-tag { background: rgba(20,181,160,0.13); color: #0FA38E; }
.tengzhi-fastener-arch-layer:last-child .tengzhi-fastener-arch-layer-icon { background: rgba(74,111,190,0.12); color: #4A6FBE; }
.tengzhi-fastener-arch-layer:last-child .tengzhi-fastener-arch-layer-tag { background: rgba(74,111,190,0.12); color: #4A6FBE; }

.tengzhi-fastener-arch-grid {
  display: grid;
  gap: 12px;
  grid-template-columns: repeat(6, 1fr);
}

.tengzhi-fastener-arch-mod {
  position: relative;
  background: #fff;
  border: 1px solid #E5EAF2;
  border-radius: 12px;
  padding: 14px;
  text-align: center;
  transition: transform 0.25s, box-shadow 0.25s, border-color 0.25s;
}

.tengzhi-fastener-arch-mod:hover {
  transform: translateY(-3px);
  box-shadow: 0 12px 24px rgba(20,30,60,0.08);
  border-color: #CDD7E5;
}

.tengzhi-fastener-arch-mod-icon {
  width: 32px;
  height: 32px;
  border-radius: 8px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 10px;
}

.tengzhi-fastener-arch-mod-icon i {
  width: 17px;
  height: 17px;
}

.tengzhi-fastener-arch-mod-tag {
  position: absolute;
  top: 12px;
  right: 14px;
  font-size: 10px;
  font-weight: 800;
  letter-spacing: 0.5px;
  color: #9CA3AF;
}

.tengzhi-fastener-arch-mod h4 {
  color: #1A1A2E;
  font-size: 14px;
  font-weight: 700;
  margin: 0;
}

.tengzhi-fastener-arch-mod[data-color="blue"] .tengzhi-fastener-arch-mod-icon { background: rgba(91,141,239,0.12); color: #4A7BD9; }
.tengzhi-fastener-arch-mod[data-color="blue"] .tengzhi-fastener-arch-mod-tag { color: #4A7BD9; }
.tengzhi-fastener-arch-mod[data-color="purple"] .tengzhi-fastener-arch-mod-icon { background: rgba(139,111,232,0.12); color: #7B5FE0; }
.tengzhi-fastener-arch-mod[data-color="purple"] .tengzhi-fastener-arch-mod-tag { color: #7B5FE0; }
.tengzhi-fastener-arch-mod[data-color="teal"] .tengzhi-fastener-arch-mod-icon { background: rgba(20,181,160,0.14); color: #0FA38E; }
.tengzhi-fastener-arch-mod[data-color="teal"] .tengzhi-fastener-arch-mod-tag { color: #0FA38E; }
.tengzhi-fastener-arch-mod[data-color="amber"] .tengzhi-fastener-arch-mod-icon { background: rgba(247,170,46,0.16); color: #D88E0F; }
.tengzhi-fastener-arch-mod[data-color="amber"] .tengzhi-fastener-arch-mod-tag { color: #D88E0F; }
.tengzhi-fastener-arch-mod[data-color="rose"] .tengzhi-fastener-arch-mod-icon { background: rgba(236,93,108,0.13); color: #DB4C5C; }
.tengzhi-fastener-arch-mod[data-color="rose"] .tengzhi-fastener-arch-mod-tag { color: #DB4C5C; }
.tengzhi-fastener-arch-mod[data-color="green"] .tengzhi-fastener-arch-mod-icon { background: rgba(46,178,110,0.14); color: #279E5C; }
.tengzhi-fastener-arch-mod[data-color="green"] .tengzhi-fastener-arch-mod-tag { color: #279E5C; }

.tengzhi-fastener-arch-flow {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-wrap: wrap;
  padding: 12px 14px;
  margin-bottom: 14px;
  background: linear-gradient(90deg,#F2FBF8 0%,#F2F4FE 50%,#FEF8F0 100%);
  border: 1px solid #E1ECEA;
  border-radius: 12px;
}

.tengzhi-fastener-arch-flow-label {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  color: #4B5563;
  font-size: 12px;
  font-weight: 700;
  padding-right: 8px;
  border-right: 1px dashed #C9D2DE;
}

.tengzhi-fastener-arch-flow-label i {
  width: 14px;
  height: 14px;
  color: #6B7280;
}

.tengzhi-fastener-arch-flow-pill {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  border-radius: 999px;
  font-size: 12px;
  font-weight: 700;
  background: #fff;
  border: 1px solid #E5EAF2;
}

.tengzhi-fastener-arch-flow-pill i {
  width: 13px;
  height: 13px;
}

.tengzhi-fastener-arch-flow-pill.blue { color: #4A7BD9; border-color: rgba(91,141,239,0.35); background: rgba(91,141,239,0.08); }
.tengzhi-fastener-arch-flow-pill.purple { color: #7B5FE0; border-color: rgba(139,111,232,0.35); background: rgba(139,111,232,0.08); }
.tengzhi-fastener-arch-flow-pill.teal { color: #0FA38E; border-color: rgba(20,181,160,0.35); background: rgba(20,181,160,0.08); }
.tengzhi-fastener-arch-flow-pill.amber { color: #D88E0F; border-color: rgba(247,170,46,0.4); background: rgba(247,170,46,0.1); }

.tengzhi-fastener-arch-flow-arrow {
  color: #9CA3AF;
  font-size: 12px;
  font-weight: 600;
}

.tengzhi-fastener-arch-flow-arrow i {
  width: 14px;
  height: 14px;
  vertical-align: middle;
}

.tengzhi-fastener-arch-flow-spacer {
  flex: 1;
  min-width: 12px;
}

.tengzhi-fastener-arch-body {
  display: grid;
  gap: 14px;
  grid-template-columns: 200px 1fr 200px;
  align-items: stretch;
}

.tengzhi-fastener-arch-io {
  background: linear-gradient(180deg,#F4F8FE 0%,#EEF3FB 100%);
  border: 1px solid #DCE5F1;
  border-radius: 14px;
  padding: 14px;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.tengzhi-fastener-arch-io.outputs {
  background: linear-gradient(180deg,#FFF8EE 0%,#FEF1DA 100%);
  border-color: #F5E2BB;
}

.tengzhi-fastener-arch-io-head {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  font-size: 12px;
  font-weight: 800;
  color: #4B5563;
}

.tengzhi-fastener-arch-io-head i {
  width: 14px;
  height: 14px;
}

.tengzhi-fastener-arch-io-card {
  background: #fff;
  border: 1px solid #E5EAF2;
  border-radius: 10px;
  padding: 10px 12px;
}

.tengzhi-fastener-arch-io-row {
  display: flex;
  align-items: center;
  gap: 8px;
  color: #1A1A2E;
  font-size: 13px;
  font-weight: 700;
}

.tengzhi-fastener-arch-io-row i {
  width: 14px;
  height: 14px;
  color: #6B7280;
}

.tengzhi-fastener-arch-pipeline {
  background: #fff;
  border: 1px solid rgba(20,181,160,0.32);
  border-radius: 14px;
  padding: 14px 16px;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.tengzhi-fastener-arch-pipe-head {
  display: flex;
  align-items: center;
  gap: 10px;
}

.tengzhi-fastener-arch-pipe-title {
  flex: 1;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: #1A1A2E;
  font-size: 14px;
  font-weight: 800;
}

.tengzhi-fastener-arch-pipe-title i {
  width: 16px;
  height: 16px;
  color: #0FA38E;
}

.tengzhi-fastener-arch-pipe-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  border-radius: 999px;
  background: rgba(20,181,160,0.12);
  color: #0FA38E;
  font-size: 11px;
  font-weight: 800;
  letter-spacing: 0.5px;
}

.tengzhi-fastener-arch-pipe-badge::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: #0FA38E;
  box-shadow: 0 0 0 3px rgba(20,181,160,0.2);
}

.tengzhi-fastener-arch-pipe-stages {
  display: grid;
  gap: 8px;
  grid-template-columns: repeat(10, 1fr);
}

.tengzhi-fastener-arch-stage {
  background: #F2FBF8;
  border: 1px solid rgba(20,181,160,0.25);
  border-radius: 10px;
  padding: 10px 6px;
  text-align: center;
}

.tengzhi-fastener-arch-stage-icon {
  width: 26px;
  height: 26px;
  border-radius: 50%;
  margin: 0 auto 6px;
  background: #fff;
  color: #0FA38E;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid rgba(20,181,160,0.3);
}

.tengzhi-fastener-arch-stage-icon i {
  width: 14px;
  height: 14px;
}

.tengzhi-fastener-arch-stage-no {
  color: #0FA38E;
  font-size: 10px;
  font-weight: 800;
  letter-spacing: 0.5px;
}

.tengzhi-fastener-arch-stage-name {
  color: #1A1A2E;
  font-size: 12px;
  font-weight: 700;
  margin-top: 2px;
}

.tengzhi-fastener-arch-notes {
  margin-top: 28px;
  display: grid;
  gap: 14px;
  grid-template-columns: repeat(3, 1fr);
}

.tengzhi-fastener-arch-note {
  background: #fff;
  border: 1px solid #E5EAF2;
  border-radius: 14px;
  padding: 18px 20px;
}

.tengzhi-fastener-arch-note-head {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 8px;
}

.tengzhi-fastener-arch-note-head i {
  width: 18px;
  height: 18px;
  color: #78C950;
}

.tengzhi-fastener-arch-note-head h4 {
  color: #1A1A2E;
  font-size: 15px;
  font-weight: 800;
  margin: 0;
}

.tengzhi-fastener-arch-note p {
  color: #6B7280;
  font-size: 13px;
  line-height: 1.7;
  margin: 0;
}

/* Core Products */
.tengzhi-fastener-product-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}

.tengzhi-fastener-product-tile {
  padding: 28px 24px;
  background: #fafbfc;
  border: 1px solid #E5EAF2;
  border-radius: 16px;
  text-align: center;
  transition: all 0.3s ease;
}

.tengzhi-fastener-product-tile:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 24px rgba(20,30,60,0.08);
  border-color: rgba(120,201,80,0.3);
  background: #fff;
}

.tengzhi-fastener-product-tag {
  display: inline-block;
  padding: 4px 12px;
  background: rgba(120,201,80,0.1);
  color: #78C950;
  font-size: 11px;
  font-weight: 700;
  border-radius: 999px;
  margin-bottom: 14px;
}

.tengzhi-fastener-product-tile h4 {
  color: #1A1A2E;
  font-size: 18px;
  font-weight: 700;
  margin: 0 0 10px;
}

.tengzhi-fastener-product-tile p {
  color: #6B7280;
  font-size: 14px;
  line-height: 1.6;
  margin: 0;
}

/* Case Studies */
.tengzhi-fastener-case-list {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 24px;
}

.tengzhi-fastener-case-card {
  background: #fff;
  border: 1px solid #E5EAF2;
  border-radius: 18px;
  overflow: hidden;
  transition: all 0.3s ease;
}

.tengzhi-fastener-case-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 16px 40px rgba(20,30,60,0.1);
  border-color: rgba(120,201,80,0.2);
}

.tengzhi-fastener-case-img {
  height: 200px;
  background-size: cover;
  background-position: center;
}

.tengzhi-fastener-case-body {
  padding: 24px;
}

.tengzhi-fastener-case-tags {
  display: flex;
  gap: 8px;
  margin-bottom: 14px;
}

.tengzhi-fastener-case-tag-industry {
  padding: 4px 10px;
  background: rgba(120,201,80,0.1);
  color: #78C950;
  font-size: 11px;
  font-weight: 700;
  border-radius: 999px;
}

.tengzhi-fastener-case-tag-module {
  padding: 4px 10px;
  background: rgba(74,111,190,0.1);
  color: #4A6FBE;
  font-size: 11px;
  font-weight: 700;
  border-radius: 999px;
}

.tengzhi-fastener-case-body h3 {
  color: #1A1A2E;
  font-size: 17px;
  font-weight: 700;
  margin: 0 0 12px;
  line-height: 1.4;
}

.tengzhi-fastener-case-body p {
  color: #6B7280;
  font-size: 13px;
  line-height: 1.7;
  margin: 0 0 20px;
}

.tengzhi-fastener-case-kpis {
  display: flex;
  gap: 16px;
  margin-bottom: 18px;
}

.tengzhi-fastener-case-kpi {
  flex: 1;
  text-align: center;
  padding: 12px;
  background: #fafbfc;
  border-radius: 12px;
}

.tengzhi-fastener-case-kpi-value {
  color: #78C950;
  font-size: 22px;
  font-weight: 800;
  margin-bottom: 4px;
}

.tengzhi-fastener-case-kpi-label {
  color: #6B7280;
  font-size: 12px;
  font-weight: 600;
}

.tengzhi-fastener-case-more {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 10px 20px;
  background: rgba(120,201,80,0.1);
  color: #78C950;
  font-size: 13px;
  font-weight: 700;
  border-radius: 999px;
  text-decoration: none;
  transition: all 0.3s ease;
}

.tengzhi-fastener-case-more:hover {
  background: #78C950;
  color: #fff;
}

.tengzhi-fastener-case-more i {
  width: 16px;
  height: 16px;
}

@media (max-width: 1400px) {
  .tengzhi-fastener-arch-grid {
    grid-template-columns: repeat(3, 1fr);
  }
  
  .tengzhi-fastener-arch-pipe-stages {
    grid-template-columns: repeat(5, 1fr);
  }
  
  .tengzhi-fastener-case-list {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 1180px) {
  .tengzhi-fastener-arch-body {
    grid-template-columns: 180px 1fr 180px;
  }
  
  .tengzhi-fastener-product-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 860px) {
  .tengzhi-fastener-arch-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .tengzhi-fastener-arch-body {
    grid-template-columns: 1fr;
  }
  
  .tengzhi-fastener-arch-pipe-stages {
    grid-template-columns: repeat(5, 1fr);
  }
  
  .tengzhi-fastener-arch-notes {
    grid-template-columns: 1fr;
  }
  
  .tengzhi-fastener-case-list {
    grid-template-columns: 1fr;
  }
  
  .tengzhi-fastener-product-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 520px) {
  .tengzhi-fastener-arch-grid {
    grid-template-columns: 1fr;
  }
  
  .tengzhi-fastener-arch-pipe-stages {
    grid-template-columns: repeat(2, 1fr);
  }
}

/* CTA Section Styles */
.tengzhi-section-cta {
  background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  padding: 80px 60px;
  text-align: center;
  margin-top: 20px;
}

.tengzhi-cta-content {
  max-width: 800px;
  margin: 0 auto;
}

.tengzhi-cta-title {
  font-size: 42px;
  font-weight: 800;
  color: #fff;
  margin-bottom: 20px;
  letter-spacing: 1px;
}

.tengzhi-cta-subtitle {
  font-size: 18px;
  color: rgba(255,255,255,0.8);
  margin-bottom: 32px;
  line-height: 1.6;
}

.tengzhi-cta-btn-group {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  flex-wrap: wrap;
}

.tengzhi-cta-btn-primary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 15px 40px;
  background: #fff;
  color: #667eea;
  font-size: 16px;
  font-weight: 700;
  border-radius: 999px;
  text-decoration: none;
  transition: all 0.3s ease;
}

.tengzhi-cta-btn-primary:hover {
  transform: translateY(-3px);
  box-shadow: 0 12px 24px rgba(0,0,0,0.15);
}

.tengzhi-cta-btn-secondary {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 15px 40px;
  background: rgba(255,255,255,0.2);
  border: 2px solid rgba(255,255,255,0.4);
  color: #fff;
  font-size: 16px;
  font-weight: 700;
  border-radius: 999px;
  text-decoration: none;
  transition: all 0.3s ease;
}

.tengzhi-cta-btn-secondary:hover {
  background: rgba(255,255,255,0.3);
  border-color: rgba(255,255,255,0.6);
}

@media (max-width: 1180px) {
  .tengzhi-section-cta {
    padding: 80px 40px;
  }
}

@media (max-width: 860px) {
  .tengzhi-section-cta {
    padding: 60px 30px;
  }
  
  .tengzhi-cta-title {
    font-size: 32px;
  }
  
  .tengzhi-cta-subtitle {
    font-size: 16px;
  }
  
  .tengzhi-cta-btn-group {
    flex-direction: column;
  }
  
  .tengzhi-cta-btn-primary,
  .tengzhi-cta-btn-secondary {
    width: 100%;
    max-width: 300px;
  }
}

@media (max-width: 520px) {
  .tengzhi-section-cta {
    padding: 50px 20px;
  }
  
  .tengzhi-cta-title {
    font-size: 26px;
  }
}