/* roulang page: index */
:root {
      --primary: #0F172A;
      --accent: #0EA5E9;
      --accent-hover: #0284C7;
      --secondary: #10B981;
      --bg-light: #F8FAFC;
      --bg-white: #FFFFFF;
      --bg-dark: #090D16;
      --text-main: #0F172A;
      --text-body: #475569;
      --text-muted: #94A3B8;
      --border-color: rgba(226, 232, 240, 0.9);
      --border-dark: rgba(255, 255, 255, 0.12);
      --radius-sm: 6px;
      --radius-md: 10px;
      --radius-lg: 16px;
      --shadow-sm: 0 2px 8px -2px rgba(15, 23, 42, 0.04);
      --shadow-md: 0 4px 20px -2px rgba(15, 23, 42, 0.06);
      --shadow-lg: 0 12px 30px -4px rgba(15, 23, 42, 0.12);
      --transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
      --container-max: 1240px;
    }

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

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

    body {
      font-family: system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", "Segoe UI", Roboto, sans-serif;
      background-color: var(--bg-light);
      color: var(--text-body);
      line-height: 1.65;
      overflow-x: hidden;
      -webkit-font-smoothing: antialiased;
    }

    a {
      color: inherit;
      text-decoration: none;
      transition: var(--transition);
    }

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

    button, input, select, textarea {
      font-family: inherit;
      font-size: 1rem;
      border: none;
      outline: none;
    }

    .container {
      width: 100%;
      max-width: var(--container-max);
      margin-left: auto;
      margin-right: auto;
      padding-left: 24px;
      padding-right: 24px;
    }

    /* Top utility bar */
    .topbar {
      background-color: var(--primary);
      color: #CBD5E1;
      font-size: 0.8125rem;
      height: 38px;
      display: flex;
      align-items: center;
      border-bottom: 1px solid rgba(255, 255, 255, 0.08);
    }
    .topbar-content {
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
    }
    .topbar-left span {
      margin-right: 20px;
    }
    .topbar-badge {
      display: inline-block;
      width: 8px;
      height: 8px;
      background: var(--secondary);
      border-radius: 50%;
      margin-right: 6px;
      box-shadow: 0 0 8px var(--secondary);
    }

    /* Main Navigation */
    .header-nav {
      position: sticky;
      top: 0;
      z-index: 100;
      background: rgba(255, 255, 255, 0.92);
      backdrop-filter: blur(12px);
      -webkit-backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border-color);
      height: 74px;
      display: flex;
      align-items: center;
    }
    .nav-wrap {
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    .brand-logo {
      display: flex;
      align-items: center;
      gap: 10px;
      font-size: 1.35rem;
      font-weight: 800;
      color: var(--primary);
      letter-spacing: -0.5px;
    }
    .brand-icon {
      width: 32px;
      height: 32px;
      background: linear-gradient(135deg, var(--accent) 0%, #0369A1 100%);
      border-radius: var(--radius-sm);
      display: flex;
      align-items: center;
      justify-content: center;
      color: #fff;
      font-weight: bold;
      font-size: 18px;
    }
    .nav-links {
      display: flex;
      align-items: center;
      list-style: none;
      gap: 28px;
    }
    .nav-link {
      font-size: 0.9375rem;
      font-weight: 500;
      color: var(--text-main);
      padding: 8px 0;
      position: relative;
    }
    .nav-link:hover {
      color: var(--accent);
    }
    .nav-link::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--accent);
      transition: var(--transition);
    }
    .nav-link:hover::after {
      width: 100%;
    }
    .nav-btn {
      background: var(--accent);
      color: #FFFFFF !important;
      padding: 10px 22px;
      border-radius: var(--radius-sm);
      font-size: 0.875rem;
      font-weight: 600;
      box-shadow: 0 4px 12px rgba(14, 165, 233, 0.25);
    }
    .nav-btn:hover {
      background: var(--accent-hover);
      transform: translateY(-1px);
    }
    .mobile-menu-btn {
      display: none;
      background: transparent;
      cursor: pointer;
      padding: 8px;
      color: var(--primary);
    }

    /* Section Global Headers */
    .section-spacing {
      padding: 84px 0;
    }
    .section-title-wrap {
      margin-bottom: 48px;
    }
    .section-badge {
      display: inline-flex;
      align-items: center;
      background: rgba(14, 165, 233, 0.08);
      color: var(--accent);
      border: 1px solid rgba(14, 165, 233, 0.2);
      padding: 4px 12px;
      border-radius: 20px;
      font-size: 0.8125rem;
      font-weight: 600;
      margin-bottom: 12px;
      letter-spacing: 0.5px;
    }
    .section-badge.dark {
      background: rgba(14, 165, 233, 0.15);
      border-color: rgba(14, 165, 233, 0.3);
      color: #38BDF8;
    }
    .section-title {
      font-size: clamp(1.75rem, 3.2vw, 2.35rem);
      font-weight: 700;
      color: var(--text-main);
      line-height: 1.25;
      margin-bottom: 14px;
      letter-spacing: -0.5px;
    }
    .section-desc {
      font-size: 1.05rem;
      color: var(--text-body);
      max-width: 780px;
      line-height: 1.7;
    }
    .text-center {
      text-align: center;
    }
    .text-center .section-desc {
      margin-left: auto;
      margin-right: auto;
    }

    /* Hero Section: Full width light top bar + compact banner blueprint */
    .hero-banner {
      background: linear-gradient(180deg, #EDF4FA 0%, var(--bg-light) 100%);
      padding: 56px 0 36px;
      border-bottom: 1px solid var(--border-color);
    }
    .hero-grid {
      display: grid;
      grid-template-columns: 1.15fr 0.85fr;
      gap: 40px;
      align-items: center;
    }
    .hero-h1 {
      font-size: clamp(2.1rem, 4vw, 3.1rem);
      font-weight: 800;
      color: var(--text-main);
      line-height: 1.18;
      letter-spacing: -0.8px;
      margin-bottom: 18px;
    }
    .hero-h1 span {
      color: var(--accent);
      position: relative;
    }
    .hero-lead {
      font-size: 1.0625rem;
      color: #334155;
      line-height: 1.75;
      margin-bottom: 28px;
    }
    .hero-actions {
      display: flex;
      gap: 16px;
      align-items: center;
    }
    .btn-main {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      background: var(--accent);
      color: #FFFFFF;
      padding: 14px 28px;
      border-radius: var(--radius-sm);
      font-weight: 600;
      box-shadow: 0 4px 14px rgba(14, 165, 233, 0.3);
      cursor: pointer;
    }
    .btn-main:hover {
      background: var(--accent-hover);
      transform: translateY(-2px);
    }
    .btn-outline {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      background: #FFFFFF;
      color: var(--primary);
      border: 1px solid #CBD5E1;
      padding: 14px 24px;
      border-radius: var(--radius-sm);
      font-weight: 600;
    }
    .btn-outline:hover {
      background: #F1F5F9;
      border-color: #94A3B8;
    }
    .hero-visual {
      position: relative;
      border-radius: var(--radius-lg);
      overflow: hidden;
      box-shadow: var(--shadow-lg);
      border: 1px solid rgba(255, 255, 255, 0.8);
    }
    .hero-visual img {
      width: 100%;
      height: 380px;
      object-fit: cover;
    }
    .hero-badge-float {
      position: absolute;
      bottom: 16px;
      left: 16px;
      right: 16px;
      background: rgba(15, 23, 42, 0.88);
      backdrop-filter: blur(8px);
      padding: 14px 18px;
      border-radius: var(--radius-md);
      color: #FFFFFF;
      display: flex;
      justify-content: space-around;
      border: 1px solid rgba(255, 255, 255, 0.15);
    }
    .float-item {
      text-align: center;
    }
    .float-item .num {
      font-size: 1.35rem;
      font-weight: 700;
      color: #38BDF8;
      display: block;
    }
    .float-item .label {
      font-size: 0.75rem;
      color: #94A3B8;
    }

    /* Section 1: KPI Dashboard */
    .kpi-section {
      padding: 30px 0 60px;
      background: var(--bg-light);
    }
    .kpi-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 20px;
    }
    .kpi-card {
      background: var(--bg-white);
      padding: 24px;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      position: relative;
      overflow: hidden;
    }
    .kpi-card:hover {
      transform: translateY(-3px);
      box-shadow: var(--shadow-md);
      border-color: rgba(14, 165, 233, 0.3);
    }
    .kpi-card::before {
      content: '';
      position: absolute;
      top: 0;
      left: 0;
      width: 4px;
      height: 100%;
      background: var(--accent);
    }
    .kpi-value {
      font-size: 2.2rem;
      font-weight: 800;
      color: var(--primary);
      margin-bottom: 4px;
      letter-spacing: -0.5px;
    }
    .kpi-unit {
      font-size: 0.95rem;
      font-weight: 500;
      color: var(--accent);
      margin-left: 2px;
    }
    .kpi-title {
      font-size: 0.9375rem;
      font-weight: 600;
      color: var(--text-main);
      margin-bottom: 6px;
    }
    .kpi-sub {
      font-size: 0.8125rem;
      color: var(--text-muted);
      line-height: 1.5;
    }

    /* Section 2: Architecture & Specs */
    .arch-section {
      background: #FFFFFF;
      border-top: 1px solid var(--border-color);
      border-bottom: 1px solid var(--border-color);
    }
    .arch-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 48px;
      align-items: center;
    }
    .arch-img-wrap {
      border-radius: var(--radius-lg);
      overflow: hidden;
      box-shadow: var(--shadow-md);
      border: 1px solid var(--border-color);
    }
    .arch-img-wrap img {
      width: 100%;
      height: 420px;
      object-fit: cover;
    }
    .spec-list {
      display: flex;
      flex-direction: column;
      gap: 18px;
      margin-top: 24px;
    }
    .spec-item {
      display: flex;
      gap: 16px;
      background: var(--bg-light);
      padding: 16px 20px;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
    }
    .spec-icon {
      font-size: 1.3rem;
      color: var(--accent);
      flex-shrink: 0;
      margin-top: 2px;
    }
    .spec-title {
      font-weight: 600;
      color: var(--text-main);
      margin-bottom: 4px;
    }
    .spec-desc {
      font-size: 0.875rem;
      color: var(--text-body);
    }

    /* Section 3: Service Matrix (6 Grid) */
    .services-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .service-card {
      background: #FFFFFF;
      padding: 32px 24px;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }
    .service-card:hover {
      border-color: var(--accent);
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
    }
    .service-icon-box {
      width: 48px;
      height: 48px;
      border-radius: var(--radius-sm);
      background: rgba(14, 165, 233, 0.1);
      color: var(--accent);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.4rem;
      margin-bottom: 20px;
    }
    .service-title {
      font-size: 1.15rem;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 10px;
    }
    .service-text {
      font-size: 0.9rem;
      color: var(--text-body);
      line-height: 1.65;
    }

    /* Section 4: Product Portfolio */
    .products-section {
      background: #FFFFFF;
      border-top: 1px solid var(--border-color);
      border-bottom: 1px solid var(--border-color);
    }
    .products-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    .product-card {
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      overflow: hidden;
      background: #FFFFFF;
      display: flex;
      flex-direction: column;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }
    .product-card:hover {
      box-shadow: var(--shadow-lg);
      transform: translateY(-4px);
    }
    .product-thumb {
      height: 220px;
      width: 100%;
      overflow: hidden;
      background: #E2E8F0;
    }
    .product-thumb img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: var(--transition);
    }
    .product-card:hover .product-thumb img {
      transform: scale(1.04);
    }
    .product-body {
      padding: 24px;
      flex-grow: 1;
      display: flex;
      flex-direction: column;
    }
    .product-tag {
      font-size: 0.75rem;
      font-weight: 600;
      color: var(--accent);
      background: rgba(14, 165, 233, 0.1);
      padding: 3px 8px;
      border-radius: 4px;
      align-self: flex-start;
      margin-bottom: 12px;
    }
    .product-name {
      font-size: 1.25rem;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 10px;
    }
    .product-desc {
      font-size: 0.875rem;
      color: var(--text-body);
      margin-bottom: 20px;
      line-height: 1.6;
    }
    .spec-capsules {
      display: flex;
      flex-wrap: wrap;
      gap: 8px;
      margin-top: auto;
      margin-bottom: 20px;
      padding-top: 14px;
      border-top: 1px dashed var(--border-color);
    }
    .capsule {
      font-size: 0.75rem;
      background: var(--bg-light);
      border: 1px solid var(--border-color);
      padding: 4px 10px;
      border-radius: 20px;
      color: var(--text-main);
      font-weight: 500;
    }
    .product-btn {
      text-align: center;
      padding: 10px;
      background: var(--primary);
      color: #FFFFFF;
      border-radius: var(--radius-sm);
      font-size: 0.875rem;
      font-weight: 600;
    }
    .product-btn:hover {
      background: var(--accent);
    }

    /* Section 5: Dark Tech Section */
    .dark-section {
      background: var(--bg-dark);
      color: #F8FAFC;
    }
    .dark-section .section-title {
      color: #FFFFFF;
    }
    .dark-section .section-desc {
      color: #94A3B8;
    }
    .dark-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 48px;
      align-items: center;
    }
    .dark-card-list {
      display: flex;
      flex-direction: column;
      gap: 20px;
    }
    .dark-feature-card {
      background: rgba(255, 255, 255, 0.04);
      border: 1px solid var(--border-dark);
      padding: 24px;
      border-radius: var(--radius-md);
      transition: var(--transition);
    }
    .dark-feature-card:hover {
      background: rgba(255, 255, 255, 0.08);
      border-color: rgba(14, 165, 233, 0.4);
    }
    .dark-feat-h {
      font-size: 1.15rem;
      font-weight: 700;
      color: #38BDF8;
      margin-bottom: 8px;
    }
    .dark-feat-p {
      font-size: 0.9rem;
      color: #94A3B8;
      line-height: 1.6;
    }
    .dark-visual {
      border-radius: var(--radius-lg);
      overflow: hidden;
      border: 1px solid var(--border-dark);
      box-shadow: 0 20px 40px rgba(0, 0, 0, 0.5);
    }
    .dark-visual img {
      width: 100%;
      height: 400px;
      object-fit: cover;
    }

    /* Section 6: Comparison Table */
    .comparison-table-wrap {
      background: #FFFFFF;
      border-radius: var(--radius-lg);
      border: 1px solid var(--border-color);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
    }
    .comp-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
    }
    .comp-table th, .comp-table td {
      padding: 20px 24px;
      border-bottom: 1px solid var(--border-color);
    }
    .comp-table th {
      background: #F1F5F9;
      font-weight: 700;
      color: var(--text-main);
      font-size: 0.95rem;
    }
    .comp-table th.highlight {
      background: rgba(14, 165, 233, 0.12);
      color: #0369A1;
      border-top: 3px solid var(--accent);
    }
    .comp-table td.highlight {
      background: rgba(14, 165, 233, 0.03);
      font-weight: 600;
      color: var(--primary);
    }
    .comp-table tr:last-child td {
      border-bottom: none;
    }
    .comp-dim {
      font-weight: 600;
      color: var(--text-main);
    }
    .badge-win {
      display: inline-block;
      padding: 2px 8px;
      background: rgba(16, 185, 129, 0.1);
      color: var(--secondary);
      border-radius: 4px;
      font-size: 0.75rem;
      font-weight: 700;
      margin-left: 6px;
    }

    /* Section 7: Milestones & Network */
    .milestones-wrap {
      position: relative;
      padding: 20px 0;
    }
    .timeline-bar {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
      position: relative;
    }
    .timeline-bar::before {
      content: '';
      position: absolute;
      top: 24px;
      left: 10%;
      right: 10%;
      height: 3px;
      background: #E2E8F0;
      z-index: 1;
    }
    .milestone-node {
      position: relative;
      z-index: 2;
      text-align: center;
    }
    .node-dot {
      width: 48px;
      height: 48px;
      border-radius: 50%;
      background: #FFFFFF;
      border: 3px solid var(--accent);
      color: var(--accent);
      font-weight: 700;
      display: flex;
      align-items: center;
      justify-content: center;
      margin: 0 auto 18px;
      box-shadow: 0 0 0 6px rgba(14, 165, 233, 0.12);
    }
    .node-phase {
      font-size: 1.05rem;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 6px;
    }
    .node-desc {
      font-size: 0.85rem;
      color: var(--text-body);
      line-height: 1.55;
    }

    /* Section 8: Case Stories */
    .cases-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    .case-card {
      background: #FFFFFF;
      border-radius: var(--radius-lg);
      border: 1px solid var(--border-color);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
    }
    .case-img {
      height: 180px;
    }
    .case-img img {
      width: 100%;
      height: 100%;
      object-fit: cover;
    }
    .case-content {
      padding: 24px;
    }
    .case-tag {
      font-size: 0.75rem;
      color: #0284C7;
      font-weight: 600;
      margin-bottom: 6px;
      display: block;
    }
    .case-title {
      font-size: 1.15rem;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 12px;
    }
    .case-metric {
      background: var(--bg-light);
      padding: 10px 14px;
      border-radius: var(--radius-sm);
      font-size: 0.85rem;
      font-weight: 600;
      color: var(--primary);
      margin-bottom: 12px;
      border-left: 3px solid var(--secondary);
    }
    .case-p {
      font-size: 0.875rem;
      color: var(--text-body);
      line-height: 1.6;
    }

    /* Section 9: News / Insights */
    .news-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .news-card {
      background: #FFFFFF;
      padding: 24px;
      border-radius: var(--radius-md);
      border: 1px solid var(--border-color);
      display: flex;
      flex-direction: column;
      transition: var(--transition);
    }
    .news-card:hover {
      border-color: var(--accent);
      transform: translateY(-3px);
    }
    .news-date {
      font-size: 0.8rem;
      color: var(--text-muted);
      margin-bottom: 8px;
    }
    .news-h {
      font-size: 1.1rem;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 10px;
      line-height: 1.4;
    }
    .news-summary {
      font-size: 0.875rem;
      color: var(--text-body);
      line-height: 1.6;
      margin-bottom: 18px;
      flex-grow: 1;
    }
    .news-more {
      font-size: 0.875rem;
      font-weight: 600;
      color: var(--accent);
      display: inline-flex;
      align-items: center;
      gap: 4px;
    }

    /* Section 10: Platform Guarantee */
    .guarantee-bar {
      background: #F1F5F9;
      border-top: 1px solid var(--border-color);
      border-bottom: 1px solid var(--border-color);
    }
    .guarantee-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }
    .guarantee-item {
      display: flex;
      align-items: flex-start;
      gap: 14px;
    }
    .guar-icon {
      width: 40px;
      height: 40px;
      background: #FFFFFF;
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 1.2rem;
      color: var(--accent);
      box-shadow: var(--shadow-sm);
      flex-shrink: 0;
    }
    .guar-h {
      font-size: 0.95rem;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 4px;
    }
    .guar-p {
      font-size: 0.8125rem;
      color: var(--text-body);
      line-height: 1.5;
    }

    /* Section 11: Quick Answers (FAQ List) */
    .faq-container {
      max-width: 860px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 14px;
    }
    .faq-card {
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      overflow: hidden;
      transition: var(--transition);
    }
    .faq-card:hover {
      border-color: #CBD5E1;
    }
    .faq-question {
      padding: 20px 24px;
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-weight: 600;
      color: var(--text-main);
      font-size: 1.05rem;
      background: #FFFFFF;
      user-select: none;
    }
    .faq-icon {
      font-size: 1.2rem;
      color: var(--accent);
      transition: transform 0.3s ease;
    }
    .faq-answer {
      padding: 0 24px 20px;
      font-size: 0.9375rem;
      color: var(--text-body);
      line-height: 1.7;
      display: none;
      border-top: 1px dashed var(--border-color);
      margin-top: -4px;
      padding-top: 16px;
    }
    .faq-card.active .faq-answer {
      display: block;
    }
    .faq-card.active .faq-icon {
      transform: rotate(45deg);
    }

    /* Section 12: Conversion Form / Contact */
    .contact-section {
      background: linear-gradient(180deg, #FFFFFF 0%, #F1F5F9 100%);
      border-top: 1px solid var(--border-color);
    }
    .contact-wrap {
      max-width: 820px;
      margin: 0 auto;
      background: #FFFFFF;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 40px;
      box-shadow: var(--shadow-md);
    }
    .form-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 20px;
    }
    .form-group {
      display: flex;
      flex-direction: column;
      gap: 6px;
    }
    .form-group.full {
      grid-column: span 2;
    }
    .form-label {
      font-size: 0.875rem;
      font-weight: 600;
      color: var(--text-main);
    }
    .form-input, .form-select, .form-textarea {
      padding: 12px 16px;
      border: 1px solid #CBD5E1;
      border-radius: var(--radius-sm);
      background: #F8FAFC;
      color: var(--text-main);
      font-size: 0.9375rem;
      transition: var(--transition);
      min-height: 48px;
    }
    .form-textarea {
      min-height: 96px;
      resize: vertical;
    }
    .form-input:focus, .form-select:focus, .form-textarea:focus {
      background: #FFFFFF;
      border-color: var(--accent);
      box-shadow: 0 0 0 3px rgba(14, 165, 233, 0.15);
    }
    .form-submit-btn {
      grid-column: span 2;
      background: var(--accent);
      color: #FFFFFF;
      padding: 14px;
      border-radius: var(--radius-sm);
      font-size: 1rem;
      font-weight: 600;
      cursor: pointer;
      min-height: 48px;
      transition: var(--transition);
    }
    .form-submit-btn:hover {
      background: var(--accent-hover);
      box-shadow: 0 4px 14px rgba(14, 165, 233, 0.35);
    }

    /* Footer */
    .site-footer {
      background: var(--primary);
      color: #94A3B8;
      padding: 60px 0 28px;
      font-size: 0.875rem;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 1.5fr 1fr 1fr 1fr;
      gap: 40px;
      margin-bottom: 48px;
    }
    .footer-brand {
      color: #FFFFFF;
      font-size: 1.25rem;
      font-weight: 700;
      margin-bottom: 14px;
      display: block;
    }
    .footer-p {
      line-height: 1.7;
      margin-bottom: 16px;
      max-width: 320px;
    }
    .footer-title {
      font-size: 1rem;
      font-weight: 600;
      color: #FFFFFF;
      margin-bottom: 16px;
    }
    .footer-links {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }
    .footer-links a:hover {
      color: #FFFFFF;
    }
    .footer-bottom {
      border-top: 1px solid rgba(255, 255, 255, 0.08);
      padding-top: 24px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      font-size: 0.8125rem;
    }

    /* Mobile Drawer */
    .mobile-drawer {
      display: none;
      position: fixed;
      top: 74px;
      left: 0;
      right: 0;
      bottom: 0;
      background: #FFFFFF;
      z-index: 99;
      padding: 24px;
      flex-direction: column;
      gap: 18px;
      border-top: 1px solid var(--border-color);
      overflow-y: auto;
    }
    .mobile-drawer.show {
      display: flex;
    }
    .mobile-nav-link {
      font-size: 1.1rem;
      font-weight: 600;
      color: var(--text-main);
      padding: 12px 0;
      border-bottom: 1px solid #F1F5F9;
    }

    /* Responsive Breakpoints */
    @media (max-width: 1024px) {
      .services-grid, .products-grid, .cases-grid, .news-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .kpi-grid, .guarantee-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .timeline-bar {
        grid-template-columns: repeat(2, 1fr);
        row-gap: 32px;
      }
      .timeline-bar::before {
        display: none;
      }
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
    }

    @media (max-width: 768px) {
      .topbar {
        display: none;
      }
      .nav-links, .nav-btn {
        display: none;
      }
      .mobile-menu-btn {
        display: block;
      }
      .hero-grid, .arch-grid, .dark-grid {
        grid-template-columns: 1fr;
      }
      .services-grid, .products-grid, .cases-grid, .news-grid {
        grid-template-columns: 1fr;
      }
      .kpi-grid, .guarantee-grid {
        grid-template-columns: 1fr;
      }
      .timeline-bar {
        grid-template-columns: 1fr;
      }
      .form-grid {
        grid-template-columns: 1fr;
      }
      .form-group.full, .form-submit-btn {
        grid-column: span 1;
      }
      .contact-wrap {
        padding: 24px 16px;
      }
      .footer-grid {
        grid-template-columns: 1fr;
        gap: 28px;
      }
      .footer-bottom {
        flex-direction: column;
        gap: 12px;
        text-align: center;
      }
      .hero-visual img, .arch-img-wrap img, .dark-visual img {
        height: 260px;
      }
    }