/* roulang page: index */
:root {
      --primary: #F97316;
      --primary-hover: #EA580C;
      --primary-subtle: #FFF7ED;
      --secondary: #0EA5E9;
      --secondary-dark: #0284C7;
      --dark-bg: #0F172A;
      --dark-surface: #1E293B;
      --dark-card: #243247;
      --light-bg: #F8FAFC;
      --light-alt: #F1F5F9;
      --text-main: #0F172A;
      --text-body: #334155;
      --text-muted: #64748B;
      --text-inverse: #FFFFFF;
      --border-color: #E2E8F0;
      --border-dark: #334155;
      --radius-sm: 4px;
      --radius-md: 8px;
      --shadow-sm: 0 1px 3px rgba(0,0,0,0.08), 0 1px 2px rgba(0,0,0,0.04);
      --shadow-md: 0 4px 6px -1px rgba(0,0,0,0.1), 0 2px 4px -1px rgba(0,0,0,0.06);
      --shadow-hover: 0 10px 15px -3px rgba(0,0,0,0.1), 0 4px 6px -2px rgba(0,0,0,0.05);
      --container-max: 1240px;
    }

    *, *::before, *::after {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }

    html {
      scroll-behavior: smooth;
      font-size: 16px;
    }

    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      background-color: var(--light-bg);
      color: var(--text-body);
      line-height: 1.65;
      -webkit-font-smoothing: antialiased;
    }

    a {
      color: inherit;
      text-decoration: none;
      transition: all 0.2s ease;
    }

    img {
      max-width: 100%;
      height: auto;
      display: block;
    }

    button, input, select, textarea {
      font-family: inherit;
      font-size: inherit;
      color: inherit;
    }

    .container {
      width: 100%;
      max-width: var(--container-max);
      margin-left: auto;
      margin-right: auto;
      padding-left: 20px;
      padding-right: 20px;
    }

    /* 顶部导航与复合栏 */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 999;
      background: #FFFFFF;
      border-bottom: 1px solid var(--border-color);
      box-shadow: 0 2px 8px rgba(0,0,0,0.04);
    }

    .header-topbar {
      background-color: var(--dark-bg);
      color: #94A3B8;
      font-size: 0.8125rem;
      padding: 6px 0;
      border-bottom: 1px solid rgba(255,255,255,0.08);
    }
    .header-topbar .container {
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    .topbar-info {
      display: flex;
      gap: 20px;
    }
    .topbar-tag {
      color: var(--primary);
      font-weight: 600;
    }

    .main-nav-bar {
      display: flex;
      justify-content: space-between;
      align-items: center;
      height: 72px;
    }

    .site-logo {
      display: flex;
      align-items: center;
      gap: 12px;
      font-size: 1.35rem;
      font-weight: 800;
      color: var(--text-main);
      letter-spacing: -0.5px;
    }
    .logo-badge {
      width: 38px;
      height: 38px;
      background: linear-gradient(135deg, var(--primary) 0%, #D95D02 100%);
      color: #FFFFFF;
      display: flex;
      align-items: center;
      justify-content: center;
      border-radius: var(--radius-sm);
      font-size: 1.1rem;
      font-weight: 900;
      box-shadow: 0 2px 6px rgba(249,115,22,0.35);
    }

    .nav-links {
      display: flex;
      gap: 28px;
      list-style: none;
      align-items: center;
    }
    .nav-links a {
      font-size: 0.95rem;
      font-weight: 600;
      color: var(--text-body);
      position: relative;
      padding: 6px 0;
    }
    .nav-links a:hover, .nav-links a.active {
      color: var(--primary);
    }
    .nav-links a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background-color: var(--primary);
      transition: width 0.25s ease;
    }
    .nav-links a:hover::after, .nav-links a.active::after {
      width: 100%;
    }

    .nav-action-btn {
      background: var(--primary);
      color: #FFFFFF;
      padding: 9px 20px;
      font-size: 0.9rem;
      font-weight: 700;
      border-radius: var(--radius-sm);
      display: inline-flex;
      align-items: center;
      gap: 8px;
      box-shadow: 0 2px 6px rgba(249,115,22,0.3);
    }
    .nav-action-btn:hover {
      background: var(--primary-hover);
      color: #FFFFFF;
      transform: translateY(-1px);
    }

    .mobile-menu-toggle {
      display: none;
      background: none;
      border: 1px solid var(--border-color);
      padding: 8px;
      border-radius: var(--radius-sm);
      cursor: pointer;
    }
    .mobile-menu-toggle svg {
      display: block;
      width: 24px;
      height: 24px;
      stroke: var(--text-main);
    }

    /* 板块通用规范 */
    .section-wrap {
      padding: 88px 0;
      position: relative;
    }
    .section-wrap.alt-bg {
      background-color: var(--light-alt);
    }
    .section-wrap.dark-bg {
      background-color: var(--dark-bg);
      color: var(--text-inverse);
    }

    .section-heading-box {
      margin-bottom: 48px;
      position: relative;
    }
    .section-heading-box.text-center {
      text-align: center;
    }
    .section-eyebrow {
      display: inline-block;
      font-size: 0.8125rem;
      font-weight: 700;
      text-transform: uppercase;
      letter-spacing: 1.5px;
      color: var(--primary);
      background: var(--primary-subtle);
      padding: 4px 12px;
      border-radius: var(--radius-sm);
      margin-bottom: 12px;
      border: 1px solid rgba(249,115,22,0.2);
    }
    .dark-bg .section-eyebrow {
      background: rgba(249,115,22,0.15);
      border-color: rgba(249,115,22,0.3);
    }
    .section-title {
      font-size: 2.15rem;
      font-weight: 800;
      color: var(--text-main);
      line-height: 1.3;
      margin-bottom: 14px;
      letter-spacing: -0.5px;
    }
    .dark-bg .section-title {
      color: var(--text-inverse);
    }
    .section-desc {
      font-size: 1.05rem;
      color: var(--text-muted);
      max-width: 760px;
      line-height: 1.7;
    }
    .text-center .section-desc {
      margin-left: auto;
      margin-right: auto;
    }
    .dark-bg .section-desc {
      color: #94A3B8;
    }

    /* 按钮规范 */
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      padding: 12px 24px;
      font-size: 0.95rem;
      font-weight: 700;
      border-radius: var(--radius-sm);
      cursor: pointer;
      transition: all 0.2s ease;
      border: 1px solid transparent;
    }
    .btn-primary {
      background-color: var(--primary);
      color: #FFFFFF;
      box-shadow: 0 2px 6px rgba(249,115,22,0.35);
    }
    .btn-primary:hover {
      background-color: var(--primary-hover);
      color: #FFFFFF;
      transform: translateY(-2px);
      box-shadow: 0 4px 12px rgba(249,115,22,0.45);
    }
    .btn-secondary {
      background-color: #FFFFFF;
      color: var(--text-main);
      border-color: var(--border-color);
    }
    .btn-secondary:hover {
      border-color: var(--primary);
      color: var(--primary);
      transform: translateY(-2px);
    }
    .btn-dark {
      background-color: var(--dark-surface);
      color: var(--text-inverse);
      border-color: var(--border-dark);
    }
    .btn-dark:hover {
      background-color: #2D3E55;
      color: #FFFFFF;
      transform: translateY(-2px);
    }

    /* 1. 首屏全宽交互Banner / 斜切工业风格 (#hero) */
    .hero-section {
      background: linear-gradient(135deg, #0F172A 0%, #1E293B 100%);
      color: #FFFFFF;
      padding: 68px 0 90px 0;
      position: relative;
      overflow: hidden;
      clip-path: polygon(0 0, 100% 0, 100% 96%, 0 100%);
    }
    .hero-pattern {
      position: absolute;
      top: 0;
      left: 0;
      right: 0;
      bottom: 0;
      background-image: radial-gradient(rgba(249,115,22,0.12) 1px, transparent 1px);
      background-size: 24px 24px;
      pointer-events: none;
    }
    .hero-status-strip {
      display: inline-flex;
      align-items: center;
      gap: 10px;
      background: rgba(255,255,255,0.08);
      border: 1px solid rgba(255,255,255,0.15);
      padding: 6px 14px;
      border-radius: 999px;
      font-size: 0.85rem;
      margin-bottom: 24px;
    }
    .status-pulse {
      width: 10px;
      height: 10px;
      border-radius: 50%;
      background: #10B981;
      box-shadow: 0 0 8px #10B981;
    }
    .hero-content h1 {
      font-size: 2.75rem;
      font-weight: 900;
      line-height: 1.25;
      letter-spacing: -1px;
      margin-bottom: 18px;
    }
    .hero-content h1 .highlight-text {
      color: var(--primary);
    }
    .hero-lead-text {
      font-size: 1.15rem;
      line-height: 1.75;
      color: #CBD5E1;
      max-width: 820px;
      margin-bottom: 32px;
    }
    .hero-actions {
      display: flex;
      gap: 16px;
      margin-bottom: 48px;
      flex-wrap: wrap;
    }
    .hero-icon-matrix {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 16px;
      border-top: 1px solid rgba(255,255,255,0.12);
      padding-top: 32px;
    }
    .matrix-item {
      background: rgba(255,255,255,0.04);
      border: 1px solid rgba(255,255,255,0.08);
      padding: 16px;
      border-radius: var(--radius-sm);
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .matrix-icon {
      width: 36px;
      height: 36px;
      background: rgba(249,115,22,0.15);
      color: var(--primary);
      display: flex;
      align-items: center;
      justify-content: center;
      border-radius: var(--radius-sm);
      font-weight: 700;
    }
    .matrix-title {
      font-size: 0.9rem;
      font-weight: 700;
      color: #FFFFFF;
    }
    .matrix-sub {
      font-size: 0.775rem;
      color: #94A3B8;
    }

    /* 2. 施工交期与开工倒计时 (#countdown) */
    .countdown-bar-wrap {
      background: #FFFFFF;
      margin-top: -30px;
      position: relative;
      z-index: 10;
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-md);
      border: 1px solid var(--border-color);
      padding: 24px 32px;
    }
    .countdown-flex {
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 20px;
    }
    .countdown-title-box h3 {
      font-size: 1.15rem;
      color: var(--text-main);
      font-weight: 800;
      margin-bottom: 4px;
    }
    .countdown-title-box p {
      font-size: 0.875rem;
      color: var(--text-muted);
    }
    .countdown-timer-units {
      display: flex;
      align-items: center;
      gap: 12px;
    }
    .timer-unit-box {
      background: var(--light-alt);
      border: 1px solid var(--border-color);
      padding: 8px 14px;
      border-radius: var(--radius-sm);
      text-align: center;
      min-width: 68px;
    }
    .unit-num {
      font-size: 1.5rem;
      font-weight: 800;
      color: var(--primary);
      line-height: 1;
    }
    .unit-label {
      font-size: 0.725rem;
      color: var(--text-muted);
      text-transform: uppercase;
      margin-top: 4px;
    }
    .timer-colon {
      font-size: 1.25rem;
      font-weight: 800;
      color: var(--text-muted);
    }

    /* 3. 建筑机器人全景介绍与硬核产品体系区 (#overview) */
    .overview-grid {
      display: grid;
      grid-template-columns: 5fr 7fr;
      gap: 40px;
      align-items: center;
    }
    .overview-media {
      position: relative;
    }
    .overview-image {
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-md);
      border: 1px solid var(--border-color);
      width: 100%;
      height: 380px;
      object-fit: cover;
    }
    .param-badge-overlay {
      position: absolute;
      bottom: -16px;
      right: 16px;
      background: var(--dark-bg);
      color: #FFFFFF;
      padding: 14px 20px;
      border-radius: var(--radius-sm);
      border-left: 4px solid var(--primary);
      box-shadow: var(--shadow-hover);
    }
    .param-badge-overlay .badge-num {
      font-size: 1.4rem;
      font-weight: 800;
      color: var(--primary);
    }
    .param-badge-overlay .badge-lbl {
      font-size: 0.775rem;
      color: #94A3B8;
    }
    .spec-table-list {
      margin-top: 24px;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      overflow: hidden;
    }
    .spec-row {
      display: flex;
      padding: 12px 18px;
      background: #FFFFFF;
      border-bottom: 1px solid var(--border-color);
      font-size: 0.9rem;
    }
    .spec-row:last-child {
      border-bottom: none;
    }
    .spec-row:nth-child(even) {
      background: var(--light-alt);
    }
    .spec-term {
      width: 130px;
      font-weight: 700;
      color: var(--text-main);
    }
    .spec-desc {
      flex: 1;
      color: var(--text-body);
    }

    /* 4. 六大核心优势网格 (#advantages) */
    .advantages-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .adv-card {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 30px;
      box-shadow: var(--shadow-sm);
      position: relative;
      transition: all 0.25s ease;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }
    .adv-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
      border-color: var(--primary);
    }
    .adv-header {
      display: flex;
      align-items: center;
      justify-content: space-between;
      margin-bottom: 16px;
    }
    .adv-icon-box {
      width: 48px;
      height: 48px;
      background: var(--primary-subtle);
      border-radius: var(--radius-sm);
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--primary);
      font-size: 1.25rem;
    }
    .adv-status-dot {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      font-size: 0.75rem;
      font-weight: 700;
      color: #10B981;
      background: #ECFDF5;
      padding: 3px 8px;
      border-radius: 999px;
    }
    .adv-status-dot::before {
      content: '';
      width: 6px;
      height: 6px;
      background: #10B981;
      border-radius: 50%;
    }
    .adv-title {
      font-size: 1.15rem;
      font-weight: 800;
      color: var(--text-main);
      margin-bottom: 10px;
    }
    .adv-desc {
      font-size: 0.925rem;
      color: var(--text-muted);
      line-height: 1.65;
    }

    /* 5. 热门机型矩阵 (#products) */
    .products-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    .product-card {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: all 0.25s ease;
      display: flex;
      flex-direction: column;
    }
    .product-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-hover);
      border-color: var(--primary);
    }
    .product-thumb-wrap {
      position: relative;
      height: 220px;
      overflow: hidden;
      background: #CBD5E1;
    }
    .product-thumb-wrap img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: transform 0.4s ease;
    }
    .product-card:hover .product-thumb-wrap img {
      transform: scale(1.04);
    }
    .product-type-badge {
      position: absolute;
      top: 12px;
      left: 12px;
      background: rgba(15,23,42,0.85);
      color: #FFFFFF;
      font-size: 0.775rem;
      font-weight: 700;
      padding: 4px 10px;
      border-radius: var(--radius-sm);
      backdrop-filter: blur(4px);
    }
    .product-info {
      padding: 24px;
      display: flex;
      flex-direction: column;
      flex: 1;
    }
    .product-title {
      font-size: 1.25rem;
      font-weight: 800;
      color: var(--text-main);
      margin-bottom: 8px;
    }
    .product-tagline {
      font-size: 0.875rem;
      color: var(--text-muted);
      margin-bottom: 16px;
      line-height: 1.5;
    }
    .product-metrics-strip {
      display: flex;
      justify-content: space-between;
      background: var(--light-alt);
      padding: 10px 14px;
      border-radius: var(--radius-sm);
      margin-bottom: 18px;
    }
    .metric-col-title {
      font-size: 0.725rem;
      color: var(--text-muted);
    }
    .metric-col-val {
      font-size: 1rem;
      font-weight: 800;
      color: var(--primary);
    }
    .product-spec-list {
      list-style: none;
      margin-bottom: 20px;
      flex: 1;
    }
    .product-spec-list li {
      font-size: 0.85rem;
      color: var(--text-body);
      padding: 5px 0;
      border-bottom: 1px dashed var(--border-color);
      display: flex;
      justify-content: space-between;
    }
    .product-spec-list li span:first-child {
      color: var(--text-muted);
    }

    /* 6. 硬核工法与建造理念深度区 (#solutions) */
    .zigzag-flow {
      display: flex;
      flex-direction: column;
      gap: 60px;
    }
    .flow-row {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 48px;
      align-items: center;
    }
    .flow-row.reversed {
      direction: rtl;
    }
    .flow-row.reversed > * {
      direction: ltr;
    }
    .flow-media-box {
      border-radius: var(--radius-md);
      overflow: hidden;
      box-shadow: var(--shadow-md);
      border: 1px solid var(--border-dark);
      height: 320px;
      position: relative;
    }
    .flow-media-box img {
      width: 100%;
      height: 100%;
      object-fit: cover;
    }
    .flow-badge {
      display: inline-block;
      font-size: 0.8rem;
      font-weight: 700;
      color: var(--secondary);
      background: rgba(14,165,233,0.15);
      border: 1px solid rgba(14,165,233,0.3);
      padding: 3px 10px;
      border-radius: var(--radius-sm);
      margin-bottom: 12px;
    }
    .flow-title {
      font-size: 1.5rem;
      font-weight: 800;
      color: #FFFFFF;
      margin-bottom: 14px;
    }
    .flow-text {
      color: #94A3B8;
      font-size: 0.95rem;
      line-height: 1.7;
      margin-bottom: 18px;
    }
    .flow-capsules {
      display: flex;
      gap: 10px;
      flex-wrap: wrap;
    }
    .capsule-pill {
      font-size: 0.8rem;
      color: #E2E8F0;
      background: rgba(255,255,255,0.06);
      border: 1px solid rgba(255,255,255,0.12);
      padding: 5px 12px;
      border-radius: 999px;
    }

    /* 7. 典型工程场景与项目故事区 (#stories) */
    .story-card-wrapper {
      display: grid;
      grid-template-columns: 6fr 6fr;
      background: #FFFFFF;
      border-radius: var(--radius-md);
      overflow: hidden;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
    }
    .story-cover-pane {
      position: relative;
      min-height: 380px;
    }
    .story-cover-pane img {
      width: 100%;
      height: 100%;
      object-fit: cover;
    }
    .story-details-pane {
      padding: 36px;
      display: flex;
      flex-direction: column;
      justify-content: center;
    }
    .story-client-tag {
      font-size: 0.825rem;
      font-weight: 700;
      color: var(--primary);
      margin-bottom: 8px;
      text-transform: uppercase;
    }
    .story-title {
      font-size: 1.45rem;
      font-weight: 800;
      color: var(--text-main);
      margin-bottom: 14px;
    }
    .story-narrative {
      font-size: 0.95rem;
      color: var(--text-muted);
      line-height: 1.68;
      margin-bottom: 20px;
    }
    .story-stats-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 14px;
      background: var(--light-alt);
      padding: 16px;
      border-radius: var(--radius-sm);
    }
    .story-stat-val {
      font-size: 1.25rem;
      font-weight: 900;
      color: var(--text-main);
    }
    .story-stat-label {
      font-size: 0.75rem;
      color: var(--text-muted);
    }

    /* 8. 关键施工效能统计看板条 (#metrics) */
    .metrics-banner {
      background: linear-gradient(90deg, #1E293B 0%, #0F172A 100%);
      border-top: 1px solid var(--border-dark);
      border-bottom: 1px solid var(--border-dark);
      padding: 48px 0;
    }
    .metrics-row {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }
    .metric-board-card {
      text-align: center;
      padding: 18px;
      border-right: 1px solid rgba(255,255,255,0.08);
    }
    .metric-board-card:last-child {
      border-right: none;
    }
    .metric-big-num {
      font-size: 2.75rem;
      font-weight: 900;
      color: var(--primary);
      line-height: 1.1;
      letter-spacing: -1px;
    }
    .metric-big-unit {
      font-size: 1.15rem;
      color: #E2E8F0;
      margin-left: 2px;
      font-weight: 600;
    }
    .metric-board-title {
      font-size: 0.95rem;
      font-weight: 700;
      color: #FFFFFF;
      margin-top: 8px;
    }
    .metric-board-desc {
      font-size: 0.8rem;
      color: #94A3B8;
      margin-top: 4px;
    }

    /* 9. 参建方与工程业主口碑评价区 (#testimonials) */
    .testimonial-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .testi-card {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 28px;
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }
    .quote-mark {
      font-size: 2.2rem;
      line-height: 1;
      color: var(--primary);
      opacity: 0.4;
      margin-bottom: 8px;
      font-family: serif;
    }
    .testi-quote {
      font-size: 0.95rem;
      color: var(--text-body);
      line-height: 1.68;
      margin-bottom: 24px;
      flex: 1;
    }
    .testi-author-box {
      display: flex;
      align-items: center;
      gap: 12px;
      border-top: 1px solid var(--border-color);
      padding-top: 16px;
    }
    .author-avatar {
      width: 44px;
      height: 44px;
      border-radius: 50%;
      background: var(--dark-bg);
      color: #FFFFFF;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 0.9rem;
    }
    .author-name {
      font-size: 0.925rem;
      font-weight: 800;
      color: var(--text-main);
    }
    .author-role {
      font-size: 0.775rem;
      color: var(--text-muted);
    }

    /* 10. 建筑机器人产业动态与施工前沿内嵌摘要 (#news) */
    .news-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .news-card {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 24px;
      display: flex;
      flex-direction: column;
      transition: all 0.2s ease;
    }
    .news-card:hover {
      border-color: var(--primary);
      box-shadow: var(--shadow-sm);
    }
    .news-date-badge {
      display: inline-block;
      font-size: 0.75rem;
      font-weight: 700;
      color: var(--text-muted);
      background: var(--light-alt);
      padding: 3px 8px;
      border-radius: var(--radius-sm);
      margin-bottom: 12px;
      align-self: flex-start;
    }
    .news-headline {
      font-size: 1.1rem;
      font-weight: 800;
      color: var(--text-main);
      margin-bottom: 10px;
      line-height: 1.45;
    }
    .news-abstract {
      font-size: 0.885rem;
      color: var(--text-muted);
      line-height: 1.6;
      margin-bottom: 18px;
      flex: 1;
    }
    .news-trigger-btn {
      font-size: 0.85rem;
      font-weight: 700;
      color: var(--primary);
      background: none;
      border: none;
      cursor: pointer;
      display: inline-flex;
      align-items: center;
      gap: 4px;
      padding: 0;
      align-self: flex-start;
    }
    .news-trigger-btn:hover {
      color: var(--primary-hover);
      text-decoration: underline;
    }

    /* 11. 建筑机器人常见技术与采购答疑手风琴 (#faq) */
    .faq-container {
      max-width: 860px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 14px;
    }
    .faq-item {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
    }
    .faq-question {
      width: 100%;
      text-align: left;
      background: #FFFFFF;
      border: none;
      padding: 18px 24px;
      font-size: 1.05rem;
      font-weight: 700;
      color: var(--text-main);
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
      transition: background 0.2s ease;
    }
    .faq-question:hover {
      background: var(--light-alt);
    }
    .faq-icon-arrow {
      width: 18px;
      height: 18px;
      stroke: var(--text-muted);
      transition: transform 0.3s ease;
    }
    .faq-item.active .faq-icon-arrow {
      transform: rotate(180deg);
      stroke: var(--primary);
    }
    .faq-item.active .faq-question {
      color: var(--primary);
    }
    .faq-answer {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease, padding 0.3s ease;
      background: #FAFAFA;
      padding: 0 24px;
      font-size: 0.925rem;
      line-height: 1.7;
      color: var(--text-body);
      border-top: 1px solid transparent;
    }
    .faq-item.active .faq-answer {
      max-height: 200px;
      padding: 16px 24px;
      border-top-color: var(--border-color);
    }

    /* 12. 施工安全标准与运维保障承诺条 (#guarantee) */
    .guarantee-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
    }
    .guarantee-box {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 24px;
      text-align: center;
      box-shadow: var(--shadow-sm);
    }
    .guar-icon-badge {
      width: 52px;
      height: 52px;
      margin: 0 auto 16px auto;
      background: var(--light-alt);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--primary);
      font-size: 1.35rem;
      font-weight: 800;
    }
    .guar-title {
      font-size: 1.05rem;
      font-weight: 800;
      color: var(--text-main);
      margin-bottom: 8px;
    }
    .guar-desc {
      font-size: 0.85rem;
      color: var(--text-muted);
      line-height: 1.55;
    }

    /* 13. 底部全宽项目工程对接与采购意向转化区 (#contact) */
    .contact-wrapper {
      background: var(--dark-bg);
      border-radius: var(--radius-md);
      padding: 56px 48px;
      box-shadow: var(--shadow-hover);
      border: 1px solid var(--border-dark);
      display: grid;
      grid-template-columns: 5fr 7fr;
      gap: 48px;
      color: #FFFFFF;
    }
    .contact-info-col h3 {
      font-size: 2rem;
      font-weight: 800;
      margin-bottom: 16px;
      line-height: 1.3;
    }
    .contact-info-col p {
      font-size: 0.95rem;
      color: #94A3B8;
      line-height: 1.7;
      margin-bottom: 28px;
    }
    .contact-direct-cards {
      display: flex;
      flex-direction: column;
      gap: 16px;
    }
    .direct-card {
      background: var(--dark-surface);
      border: 1px solid var(--border-dark);
      padding: 14px 18px;
      border-radius: var(--radius-sm);
      display: flex;
      align-items: center;
      gap: 16px;
    }
    .direct-title {
      font-size: 0.8rem;
      color: #94A3B8;
    }
    .direct-val {
      font-size: 1.05rem;
      font-weight: 800;
      color: #FFFFFF;
    }
    .form-box {
      background: var(--dark-surface);
      border: 1px solid var(--border-dark);
      padding: 32px;
      border-radius: var(--radius-sm);
    }
    .form-group-row {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 16px;
      margin-bottom: 16px;
    }
    .form-group {
      margin-bottom: 16px;
    }
    .form-label {
      display: block;
      font-size: 0.85rem;
      font-weight: 700;
      color: #CBD5E1;
      margin-bottom: 6px;
    }
    .form-input, .form-select, .form-textarea {
      width: 100%;
      background: #0F172A;
      border: 1px solid var(--border-dark);
      border-radius: var(--radius-sm);
      padding: 10px 14px;
      color: #FFFFFF;
      font-size: 0.9rem;
      outline: none;
      transition: border-color 0.2s;
    }
    .form-input:focus, .form-select:focus, .form-textarea:focus {
      border-color: var(--primary);
    }
    .form-textarea {
      resize: vertical;
      min-height: 90px;
    }
    .submit-btn-full {
      width: 100%;
      padding: 13px;
      background: var(--primary);
      color: #FFFFFF;
      border: none;
      font-weight: 800;
      border-radius: var(--radius-sm);
      cursor: pointer;
      font-size: 1rem;
      transition: background 0.2s;
    }
    .submit-btn-full:hover {
      background: var(--primary-hover);
    }

    /* 资讯轻量模态窗 */
    .news-modal-backdrop {
      display: none;
      position: fixed;
      top: 0;
      left: 0;
      right: 0;
      bottom: 0;
      background: rgba(15,23,42,0.75);
      z-index: 1000;
      align-items: center;
      justify-content: center;
      padding: 20px;
    }
    .news-modal-backdrop.open {
      display: flex;
    }
    .news-modal-card {
      background: #FFFFFF;
      max-width: 640px;
      width: 100%;
      border-radius: var(--radius-md);
      padding: 32px;
      position: relative;
      box-shadow: var(--shadow-hover);
    }
    .news-modal-close {
      position: absolute;
      top: 18px;
      right: 18px;
      background: none;
      border: none;
      font-size: 1.5rem;
      line-height: 1;
      cursor: pointer;
      color: var(--text-muted);
    }
    .news-modal-title {
      font-size: 1.35rem;
      font-weight: 800;
      color: var(--text-main);
      margin-bottom: 12px;
    }
    .news-modal-body {
      font-size: 0.95rem;
      line-height: 1.7;
      color: var(--text-body);
      margin-bottom: 24px;
    }

    /* 全局统一页脚 */
    .site-footer {
      background-color: var(--dark-bg);
      color: #94A3B8;
      border-top: 1px solid var(--border-dark);
      padding: 60px 0 30px 0;
      font-size: 0.875rem;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 4fr 2fr 2fr 4fr;
      gap: 40px;
      margin-bottom: 40px;
    }
    .footer-brand h4 {
      color: #FFFFFF;
      font-size: 1.3rem;
      font-weight: 800;
      margin-bottom: 14px;
      display: flex;
      align-items: center;
      gap: 10px;
    }
    .footer-brand p {
      font-size: 0.875rem;
      line-height: 1.7;
      color: #94A3B8;
    }
    .footer-col-title {
      color: #FFFFFF;
      font-size: 1rem;
      font-weight: 700;
      margin-bottom: 18px;
    }
    .footer-links-list {
      list-style: none;
    }
    .footer-links-list li {
      margin-bottom: 10px;
    }
    .footer-links-list a {
      color: #94A3B8;
    }
    .footer-links-list a:hover {
      color: var(--primary);
    }
    .footer-tech-meta {
      font-size: 0.85rem;
      line-height: 1.8;
    }
    .footer-bottom-bar {
      border-top: 1px solid rgba(255,255,255,0.08);
      padding-top: 24px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 12px;
      font-size: 0.8125rem;
    }

    /* 响应式断点控制 */
    @media (max-width: 1024px) {
      .hero-icon-matrix {
        grid-template-columns: repeat(2, 1fr);
      }
      .overview-grid {
        grid-template-columns: 1fr;
      }
      .advantages-grid, .products-grid, .news-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .metrics-row {
        grid-template-columns: repeat(2, 1fr);
        gap: 32px;
      }
      .metric-board-card:nth-child(2) {
        border-right: none;
      }
      .guarantee-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .contact-wrapper {
        grid-template-columns: 1fr;
      }
      .footer-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }

    @media (max-width: 768px) {
      .header-topbar {
        display: none;
      }
      .mobile-menu-toggle {
        display: block;
      }
      .nav-links {
        display: none;
        position: absolute;
        top: 72px;
        left: 0;
        right: 0;
        background: #FFFFFF;
        flex-direction: column;
        padding: 20px;
        border-bottom: 1px solid var(--border-color);
        box-shadow: var(--shadow-md);
        gap: 14px;
      }
      .nav-links.show {
        display: flex;
      }
      .hero-content h1 {
        font-size: 2rem;
      }
      .section-title {
        font-size: 1.65rem;
      }
      .flow-row, .flow-row.reversed {
        grid-template-columns: 1fr;
        gap: 24px;
      }
      .story-card-wrapper {
        grid-template-columns: 1fr;
      }
      .advantages-grid, .products-grid, .testimonial-grid, .news-grid, .guarantee-grid {
        grid-template-columns: 1fr;
      }
      .form-group-row {
        grid-template-columns: 1fr;
      }
      .footer-grid {
        grid-template-columns: 1fr;
      }
      .countdown-flex {
        flex-direction: column;
        align-items: flex-start;
      }
    }

    @media (max-width: 520px) {
      .hero-icon-matrix {
        grid-template-columns: 1fr;
      }
      .metrics-row {
        grid-template-columns: 1fr;
      }
      .metric-board-card {
        border-right: none;
        border-bottom: 1px solid rgba(255,255,255,0.08);
        padding-bottom: 24px;
      }
      .metric-board-card:last-child {
        border-bottom: none;
      }
    }