/* roulang page: index */
:root {
      --primary: #00E676;
      --primary-dark: #00B358;
      --secondary: #0F172A;
      --slate-card: #1E293B;
      --accent: #FF6D00;
      --bg-light: #F8FAFC;
      --bg-white: #FFFFFF;
      --bg-dark: #0B0F19;
      --text-main: #0F172A;
      --text-muted: #64748B;
      --text-light: #94A3B8;
      --border: #E2E8F0;
      --border-dark: #334155;
      --radius-sm: 8px;
      --radius-md: 12px;
      --radius-lg: 16px;
      --shadow-sm: 0 2px 8px rgba(15, 23, 42, 0.04);
      --shadow-md: 0 4px 20px -2px rgba(15, 23, 42, 0.08);
      --shadow-glow: 0 0 25px rgba(0, 230, 118, 0.25);
      --font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "WenQuanYi Micro Hei", sans-serif;
    }

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

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

    body {
      font-family: var(--font-family);
      color: var(--text-main);
      background-color: var(--bg-light);
      line-height: 1.75;
      letter-spacing: 0.02em;
      overflow-x: hidden;
      -webkit-font-smoothing: antialiased;
    }

    a {
      text-decoration: none;
      color: inherit;
      transition: all 0.25s ease;
    }

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

    .container {
      width: 100%;
      max-width: 1280px;
      margin-left: auto;
      margin-right: auto;
      padding-left: 24px;
      padding-right: 24px;
    }

    /* 顶部双行导航 */
    .top-meta-bar {
      background-color: #F1F5F9;
      font-size: 13px;
      color: var(--text-muted);
      border-bottom: 1px solid var(--border);
      padding: 6px 0;
    }
    .top-meta-inner {
      display: flex;
      justify-content: space-between;
      align-items: center;
    }
    .meta-status-pill {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      background: #E2E8F0;
      padding: 2px 10px;
      border-radius: 20px;
      font-weight: 500;
      color: #0F172A;
    }
    .status-dot {
      width: 8px;
      height: 8px;
      border-radius: 50%;
      background-color: var(--primary-dark);
      box-shadow: 0 0 8px var(--primary);
    }

    .site-nav {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(255, 255, 255, 0.95);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--border);
      transition: all 0.3s ease;
    }
    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 74px;
    }
    .brand-logo {
      display: flex;
      align-items: center;
      gap: 12px;
      font-size: 22px;
      font-weight: 800;
      color: var(--secondary);
    }
    .logo-badge {
      width: 36px;
      height: 36px;
      background: var(--secondary);
      border-radius: var(--radius-sm);
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--primary);
      font-size: 18px;
      font-weight: 900;
      box-shadow: inset 0 0 8px rgba(0, 230, 118, 0.3);
    }
    .nav-menu {
      display: flex;
      align-items: center;
      gap: 28px;
      list-style: none;
    }
    .nav-item a {
      font-size: 15px;
      font-weight: 500;
      color: #334155;
      padding: 8px 4px;
      position: relative;
    }
    .nav-item a:hover,
    .nav-item.active a {
      color: var(--secondary);
      font-weight: 600;
    }
    .nav-item a:hover::after,
    .nav-item.active a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 100%;
      height: 2px;
      background: var(--primary);
      border-radius: 2px;
    }
    .nav-cta-btn {
      background: var(--secondary);
      color: #FFFFFF;
      padding: 10px 22px;
      border-radius: var(--radius-sm);
      font-size: 14px;
      font-weight: 600;
      border: 1px solid var(--secondary);
    }
    .nav-cta-btn:hover {
      background: #1E293B;
      border-color: var(--primary);
      color: var(--primary);
    }
    .menu-toggle {
      display: none;
      background: none;
      border: none;
      font-size: 24px;
      cursor: pointer;
      color: var(--secondary);
    }

    /* 按钮规范 */
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      padding: 14px 28px;
      border-radius: var(--radius-sm);
      font-size: 15px;
      font-weight: 600;
      cursor: pointer;
      transition: all 0.25s ease;
      text-align: center;
      border: 1px solid transparent;
    }
    .btn-primary {
      background-color: var(--primary);
      color: #064E3B;
      border-color: var(--primary);
      box-shadow: 0 4px 14px rgba(0, 230, 118, 0.35);
    }
    .btn-primary:hover {
      background-color: var(--primary-dark);
      color: #FFFFFF;
      transform: translateY(-2px);
    }
    .btn-outline {
      background-color: transparent;
      color: #FFFFFF;
      border-color: rgba(255, 255, 255, 0.4);
    }
    .btn-outline:hover {
      background-color: rgba(255, 255, 255, 0.1);
      border-color: #FFFFFF;
    }
    .btn-accent {
      background-color: var(--accent);
      color: #FFFFFF;
      border-color: var(--accent);
      box-shadow: 0 4px 14px rgba(255, 109, 0, 0.3);
    }
    .btn-accent:hover {
      background-color: #E65100;
      transform: translateY(-2px);
    }

    /* 板块通用 */
    .sec-padded {
      padding: 88px 0;
    }
    .sec-header {
      margin-bottom: 54px;
      max-width: 820px;
    }
    .sec-header.center {
      margin-left: auto;
      margin-right: auto;
      text-align: center;
    }
    .sec-tag {
      display: inline-block;
      font-size: 13px;
      font-weight: 700;
      text-transform: uppercase;
      letter-spacing: 0.08em;
      color: #059669;
      background: #D1FAE5;
      padding: 4px 12px;
      border-radius: 4px;
      margin-bottom: 12px;
    }
    .sec-title {
      font-size: 34px;
      font-weight: 800;
      line-height: 1.3;
      color: var(--secondary);
      margin-bottom: 16px;
    }
    .sec-subtitle {
      font-size: 16px;
      color: var(--text-muted);
      line-height: 1.8;
    }

    /* 板块1：Hero 首屏 */
    .hero-section {
      position: relative;
      background-color: var(--secondary);
      color: #FFFFFF;
      padding: 100px 0 110px 0;
      background-image: linear-gradient(to bottom, rgba(15, 23, 42, 0.88), rgba(11, 15, 25, 0.96)), url('/assets/images/4c0ea7ca720dfe1c.png');
      background-size: cover;
      background-position: center;
      border-bottom: 1px solid var(--border-dark);
    }
    .hero-split {
      display: grid;
      grid-template-columns: 1.15fr 0.85fr;
      gap: 48px;
      align-items: center;
    }
    .hero-tagline {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      background: rgba(0, 230, 118, 0.12);
      border: 1px solid rgba(0, 230, 118, 0.3);
      padding: 6px 14px;
      border-radius: 20px;
      color: var(--primary);
      font-size: 14px;
      font-weight: 600;
      margin-bottom: 24px;
    }
    .hero-title {
      font-size: 48px;
      font-weight: 800;
      line-height: 1.25;
      margin-bottom: 20px;
      color: #FFFFFF;
    }
    .hero-title span {
      color: var(--primary);
    }
    .hero-desc {
      font-size: 16px;
      line-height: 1.8;
      color: #CBD5E1;
      margin-bottom: 32px;
    }
    .hero-actions {
      display: flex;
      flex-wrap: wrap;
      gap: 16px;
      margin-bottom: 40px;
    }
    .hero-specs-row {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 16px;
      padding-top: 28px;
      border-top: 1px solid rgba(255, 255, 255, 0.12);
    }
    .spec-item strong {
      display: block;
      font-size: 26px;
      font-weight: 800;
      color: var(--primary);
      line-height: 1.2;
    }
    .spec-item span {
      font-size: 13px;
      color: var(--text-light);
    }
    .hero-visual-card {
      background: rgba(30, 41, 59, 0.8);
      border: 1px solid rgba(255, 255, 255, 0.15);
      border-radius: var(--radius-lg);
      padding: 16px;
      box-shadow: 0 20px 40px rgba(0, 0, 0, 0.4);
      position: relative;
    }
    .hero-visual-card img {
      border-radius: var(--radius-md);
      width: 100%;
      height: 380px;
      object-fit: cover;
    }
    .radar-pulse-badge {
      position: absolute;
      bottom: 32px;
      right: 32px;
      background: rgba(15, 23, 42, 0.9);
      border: 1px solid var(--primary);
      padding: 12px 18px;
      border-radius: var(--radius-sm);
      font-size: 13px;
      color: #FFFFFF;
      box-shadow: var(--shadow-glow);
    }

    /* 板块2：产品与算法机理综述 */
    .about-section {
      background-color: var(--bg-white);
    }
    .about-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 60px;
      align-items: center;
    }
    .about-image-wrap {
      position: relative;
      border-radius: var(--radius-lg);
      overflow: hidden;
      box-shadow: var(--shadow-md);
      border: 1px solid var(--border);
    }
    .about-image-wrap img {
      width: 100%;
      height: 420px;
      object-fit: cover;
    }
    .engine-metrics-list {
      margin-top: 24px;
      display: flex;
      flex-direction: column;
      gap: 16px;
    }
    .engine-metric-item {
      display: flex;
      gap: 16px;
      align-items: flex-start;
      background: var(--bg-light);
      padding: 16px;
      border-radius: var(--radius-sm);
      border-left: 4px solid var(--primary);
    }
    .engine-metric-item h4 {
      font-size: 16px;
      color: var(--secondary);
      margin-bottom: 4px;
    }
    .engine-metric-item p {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* 板块3：核心优势六矩阵 */
    .advantages-section {
      background-color: var(--bg-light);
    }
    .adv-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    .adv-card {
      background: var(--bg-white);
      border-radius: var(--radius-md);
      padding: 32px 28px;
      border: 1px solid var(--border);
      box-shadow: var(--shadow-sm);
      transition: all 0.3s ease;
      display: flex;
      flex-direction: column;
      position: relative;
    }
    .adv-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
      border-color: var(--primary);
    }
    .adv-badge {
      align-self: flex-start;
      font-size: 12px;
      font-weight: 700;
      color: #0369A1;
      background: #E0F2FE;
      padding: 3px 10px;
      border-radius: 4px;
      margin-bottom: 18px;
    }
    .adv-card h3 {
      font-size: 20px;
      font-weight: 700;
      color: var(--secondary);
      margin-bottom: 12px;
    }
    .adv-card p {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.7;
    }

    /* 板块4：核心产品矩阵 */
    .products-section {
      background-color: var(--bg-white);
    }
    .prod-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 32px;
    }
    .prod-card {
      background: var(--bg-white);
      border: 1px solid var(--border);
      border-radius: var(--radius-lg);
      overflow: hidden;
      display: flex;
      flex-direction: column;
      box-shadow: var(--shadow-sm);
      transition: all 0.3s ease;
    }
    .prod-card:hover {
      transform: translateY(-5px);
      box-shadow: 0 16px 32px rgba(15, 23, 42, 0.1);
      border-color: #CBD5E1;
    }
    .prod-img-box {
      height: 220px;
      position: relative;
      overflow: hidden;
    }
    .prod-img-box img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: transform 0.5s ease;
    }
    .prod-card:hover .prod-img-box img {
      transform: scale(1.05);
    }
    .prod-body {
      padding: 28px;
      flex: 1;
      display: flex;
      flex-direction: column;
    }
    .prod-title {
      font-size: 21px;
      font-weight: 700;
      color: var(--secondary);
      margin-bottom: 10px;
    }
    .prod-desc {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.7;
      margin-bottom: 20px;
    }
    .prod-features {
      list-style: none;
      margin-bottom: 28px;
      padding-top: 16px;
      border-top: 1px dashed var(--border);
      display: flex;
      flex-direction: column;
      gap: 10px;
    }
    .prod-features li {
      font-size: 13px;
      color: #334155;
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .prod-features li::before {
      content: '✓';
      color: var(--primary-dark);
      font-weight: bold;
    }
    .prod-footer {
      margin-top: auto;
    }

    /* 板块5：深色全息数据理念区 */
    .dark-concept-section {
      background-color: var(--bg-dark);
      color: #FFFFFF;
      position: relative;
      background-image: radial-gradient(circle at 50% 50%, rgba(30, 41, 59, 0.5) 0%, rgba(11, 15, 25, 1) 100%);
    }
    .concept-center-content {
      text-align: center;
      max-width: 860px;
      margin: 0 auto 56px auto;
    }
    .concept-title {
      font-size: 34px;
      font-weight: 800;
      color: #FFFFFF;
      margin-bottom: 18px;
    }
    .concept-desc {
      color: var(--text-light);
      font-size: 16px;
      line-height: 1.8;
    }
    .concept-boxes-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 24px;
    }
    .concept-box {
      background: rgba(30, 41, 59, 0.6);
      border: 1px solid var(--border-dark);
      border-radius: var(--radius-md);
      padding: 30px;
      transition: all 0.3s ease;
    }
    .concept-box:hover {
      border-color: var(--primary);
      box-shadow: 0 0 20px rgba(0, 230, 118, 0.2);
    }
    .concept-num {
      font-size: 28px;
      font-weight: 800;
      color: var(--primary);
      margin-bottom: 8px;
    }
    .concept-box h4 {
      font-size: 18px;
      margin-bottom: 12px;
      color: #F8FAFC;
    }
    .concept-box p {
      font-size: 14px;
      color: var(--text-light);
      line-height: 1.7;
    }

    /* 板块6：典型应用场景 */
    .cases-section {
      background-color: var(--bg-light);
    }
    .case-panel {
      background: var(--bg-white);
      border-radius: var(--radius-lg);
      border: 1px solid var(--border);
      padding: 40px;
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 48px;
      align-items: center;
      margin-bottom: 32px;
    }
    .case-panel:last-child {
      margin-bottom: 0;
    }
    .case-panel.reverse {
      grid-template-columns: 1fr 1fr;
    }
    .case-img-wrap img {
      border-radius: var(--radius-md);
      width: 100%;
      height: 320px;
      object-fit: cover;
    }
    .case-info h3 {
      font-size: 24px;
      font-weight: 700;
      color: var(--secondary);
      margin-bottom: 16px;
    }
    .case-info p {
      font-size: 15px;
      color: var(--text-muted);
      line-height: 1.75;
      margin-bottom: 20px;
    }
    .case-data-pills {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
    }
    .case-data-pill {
      background: #F1F5F9;
      border: 1px solid var(--border);
      padding: 6px 14px;
      border-radius: 6px;
      font-size: 13px;
      font-weight: 600;
      color: var(--secondary);
    }

    /* 板块7：客户实证与用户故事 */
    .stories-section {
      background-color: var(--bg-white);
    }
    .stories-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 36px;
    }
    .story-card {
      background: var(--bg-light);
      border: 1px solid var(--border);
      border-radius: var(--radius-lg);
      padding: 36px;
      display: flex;
      flex-direction: column;
    }
    .story-meta {
      display: flex;
      justify-content: space-between;
      align-items: center;
      margin-bottom: 20px;
      border-bottom: 1px solid var(--border);
      padding-bottom: 14px;
    }
    .story-entity {
      font-size: 18px;
      font-weight: 700;
      color: var(--secondary);
    }
    .story-result-tag {
      font-size: 13px;
      font-weight: 700;
      color: #B45309;
      background: #FEF3C7;
      padding: 4px 10px;
      border-radius: 4px;
    }
    .story-body {
      font-size: 15px;
      color: var(--text-muted);
      line-height: 1.8;
      margin-bottom: 24px;
    }
    .story-stat-row {
      display: flex;
      gap: 24px;
      margin-top: auto;
      padding-top: 16px;
      border-top: 1px dashed var(--border);
    }
    .story-stat-box strong {
      display: block;
      font-size: 22px;
      font-weight: 800;
      color: var(--secondary);
    }
    .story-stat-box span {
      font-size: 13px;
      color: var(--text-muted);
    }

    /* 板块8：关键指标统计条 */
    .metrics-section {
      background-color: var(--secondary);
      color: #FFFFFF;
      padding: 60px 0;
    }
    .metrics-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
      text-align: center;
    }
    .metric-col strong {
      display: block;
      font-size: 44px;
      font-weight: 800;
      color: var(--primary);
      font-family: inherit;
      line-height: 1.1;
      margin-bottom: 8px;
    }
    .metric-col p {
      font-size: 15px;
      color: #CBD5E1;
    }

    /* 板块9：行业专家与教练评价 */
    .testimonials-section {
      background-color: var(--bg-light);
    }
    .testi-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    .testi-card {
      background: var(--bg-white);
      border-radius: var(--radius-md);
      padding: 32px;
      border: 1px solid var(--border);
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
    }
    .testi-quote {
      font-size: 15px;
      color: #334155;
      line-height: 1.8;
      margin-bottom: 24px;
      font-style: normal;
    }
    .testi-stars {
      color: var(--accent);
      font-size: 16px;
      margin-bottom: 16px;
    }
    .testi-author {
      margin-top: auto;
      display: flex;
      align-items: center;
      gap: 14px;
    }
    .testi-avatar {
      width: 48px;
      height: 48px;
      border-radius: 50%;
      background: var(--slate-card);
      color: var(--primary);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 18px;
    }
    .author-name {
      font-weight: 700;
      color: var(--secondary);
      font-size: 15px;
    }
    .author-role {
      font-size: 13px;
      color: var(--text-muted);
    }

    /* 板块10：技术动态与科研资讯 */
    .insights-section {
      background-color: var(--bg-white);
    }
    .insights-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    .insight-card {
      background: var(--bg-white);
      border: 1px solid var(--border);
      border-radius: var(--radius-md);
      padding: 28px;
      display: flex;
      flex-direction: column;
      transition: all 0.3s ease;
    }
    .insight-card:hover {
      box-shadow: var(--shadow-md);
      border-color: #CBD5E1;
    }
    .insight-date {
      font-size: 13px;
      color: var(--text-muted);
      margin-bottom: 12px;
    }
    .insight-card h3 {
      font-size: 18px;
      font-weight: 700;
      color: var(--secondary);
      margin-bottom: 14px;
      line-height: 1.4;
    }
    .insight-card p {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.7;
      margin-bottom: 20px;
    }
    .insight-anchor {
      margin-top: auto;
      font-size: 14px;
      font-weight: 600;
      color: var(--primary-dark);
      display: inline-flex;
      align-items: center;
      gap: 6px;
    }

    /* 板块11：异议拆解与技术 FAQ */
    .faq-section {
      background-color: var(--bg-light);
    }
    .faq-accordion {
      max-width: 860px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 16px;
    }
    .faq-item {
      background: var(--bg-white);
      border: 1px solid var(--border);
      border-radius: var(--radius-md);
      overflow: hidden;
      transition: all 0.25s ease;
    }
    .faq-toggle {
      width: 100%;
      text-align: left;
      padding: 22px 28px;
      font-size: 17px;
      font-weight: 700;
      color: var(--secondary);
      background: none;
      border: none;
      display: flex;
      justify-content: space-between;
      align-items: center;
      cursor: pointer;
    }
    .faq-toggle:hover {
      color: #008744;
    }
    .faq-arrow {
      font-size: 14px;
      transition: transform 0.3s ease;
      color: var(--text-muted);
    }
    .faq-content {
      padding: 0 28px 24px 28px;
      font-size: 15px;
      color: var(--text-muted);
      line-height: 1.8;
      display: none;
    }
    .faq-item.active .faq-arrow {
      transform: rotate(180deg);
      color: var(--secondary);
    }
    .faq-item.active .faq-content {
      display: block;
    }

    /* 板块12：服务承诺与安全保障条 */
    .guarantee-section {
      background-color: var(--bg-white);
      border-top: 1px solid var(--border);
      border-bottom: 1px solid var(--border);
    }
    .guarantee-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 28px;
    }
    .guarantee-item {
      display: flex;
      align-items: flex-start;
      gap: 16px;
    }
    .guarantee-icon {
      width: 44px;
      height: 44px;
      border-radius: var(--radius-sm);
      background: #ECFDF5;
      color: var(--primary-dark);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 800;
      font-size: 20px;
      flex-shrink: 0;
    }
    .guarantee-text h4 {
      font-size: 16px;
      font-weight: 700;
      color: var(--secondary);
      margin-bottom: 6px;
    }
    .guarantee-text p {
      font-size: 13px;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* 板块13：终极转化表单 CTA */
    .cta-section {
      background-color: var(--secondary);
      color: #FFFFFF;
      position: relative;
    }
    .cta-box {
      background: linear-gradient(135deg, rgba(30, 41, 59, 0.95), rgba(15, 23, 42, 0.95));
      border: 1px solid var(--border-dark);
      border-radius: var(--radius-lg);
      padding: 56px;
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 56px;
      align-items: center;
      box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
    }
    .cta-info h2 {
      font-size: 36px;
      font-weight: 800;
      line-height: 1.3;
      margin-bottom: 18px;
      color: #FFFFFF;
    }
    .cta-info p {
      font-size: 16px;
      color: #CBD5E1;
      line-height: 1.8;
      margin-bottom: 28px;
    }
    .cta-bullets {
      display: flex;
      flex-direction: column;
      gap: 12px;
      margin-bottom: 24px;
    }
    .cta-bullet-item {
      display: flex;
      align-items: center;
      gap: 10px;
      font-size: 14px;
      color: #E2E8F0;
    }
    .cta-bullet-item::before {
      content: '■';
      color: var(--primary);
      font-size: 10px;
    }
    .cta-form {
      background: rgba(15, 23, 42, 0.6);
      padding: 32px;
      border-radius: var(--radius-md);
      border: 1px solid rgba(255, 255, 255, 0.1);
      display: flex;
      flex-direction: column;
      gap: 18px;
    }
    .form-group label {
      display: block;
      font-size: 14px;
      font-weight: 600;
      margin-bottom: 8px;
      color: #E2E8F0;
    }
    .form-control {
      width: 100%;
      background: #0B0F19;
      border: 1px solid var(--border-dark);
      border-radius: var(--radius-sm);
      padding: 12px 16px;
      color: #FFFFFF;
      font-size: 14px;
      outline: none;
      transition: border-color 0.25s ease;
    }
    .form-control:focus {
      border-color: var(--primary);
    }
    select.form-control {
      appearance: none;
      background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' fill='%2394A3B8' viewBox='0 0 16 16'%3E%3Cpath d='M7.247 11.14L2.451 5.658C1.885 5.013 2.345 4 3.204 4h9.592a1 1 0 0 1 .753 1.659l-4.796 5.48a1 1 0 0 1-1.506 0z'/%3E%3C/svg%3E");
      background-repeat: no-repeat;
      background-position: right 14px center;
    }

    /* 底部固定悬浮转化条 */
    .sticky-bottom-bar {
      position: fixed;
      bottom: 0;
      left: 0;
      width: 100%;
      background: rgba(15, 23, 42, 0.95);
      backdrop-filter: blur(10px);
      border-top: 1px solid var(--border-dark);
      padding: 12px 24px;
      z-index: 999;
      display: flex;
      justify-content: space-between;
      align-items: center;
      transform: translateY(100%);
      transition: transform 0.3s ease;
    }
    .sticky-bottom-bar.show {
      transform: translateY(0);
    }
    .bar-text {
      color: #FFFFFF;
      font-size: 14px;
      font-weight: 500;
    }
    .bar-text span {
      color: var(--primary);
      font-weight: 700;
    }
    .bar-actions {
      display: flex;
      gap: 14px;
      align-items: center;
    }

    /* 页脚 */
    .site-footer {
      background-color: var(--bg-dark);
      color: #94A3B8;
      font-size: 14px;
      padding: 70px 0 100px 0;
      border-top: 1px solid var(--border-dark);
    }
    .footer-top {
      display: grid;
      grid-template-columns: 1.5fr 1fr 1fr 1fr;
      gap: 48px;
      margin-bottom: 50px;
    }
    .footer-brand h4 {
      font-size: 20px;
      color: #FFFFFF;
      margin-bottom: 16px;
      font-weight: 800;
    }
    .footer-desc {
      line-height: 1.8;
      margin-bottom: 20px;
    }
    .footer-col h5 {
      color: #FFFFFF;
      font-size: 16px;
      font-weight: 700;
      margin-bottom: 18px;
    }
    .footer-links {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 10px;
    }
    .footer-links a:hover {
      color: var(--primary);
    }
    .footer-bottom {
      padding-top: 30px;
      border-top: 1px solid var(--border-dark);
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 16px;
      font-size: 13px;
    }

    /* 响应式断点 */
    @media (max-width: 1024px) {
      .hero-split,
      .about-grid,
      .case-panel,
      .cta-box,
      .footer-top {
        grid-template-columns: 1fr;
        gap: 40px;
      }
      .adv-grid,
      .prod-grid,
      .concept-boxes-grid,
      .testi-grid,
      .insights-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .guarantee-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .metrics-grid {
        grid-template-columns: repeat(2, 1fr);
        gap: 32px;
      }
      .nav-menu {
        display: none;
      }
      .menu-toggle {
        display: block;
      }
      .nav-menu.mobile-open {
        display: flex;
        flex-direction: column;
        position: absolute;
        top: 74px;
        left: 0;
        width: 100%;
        background: #FFFFFF;
        padding: 24px;
        border-bottom: 1px solid var(--border);
        box-shadow: var(--shadow-md);
      }
    }

    @media (max-width: 768px) {
      .sec-padded {
        padding: 60px 0;
      }
      .hero-title {
        font-size: 34px;
      }
      .sec-title {
        font-size: 26px;
      }
      .adv-grid,
      .prod-grid,
      .concept-boxes-grid,
      .testi-grid,
      .insights-grid,
      .stories-grid,
      .guarantee-grid {
        grid-template-columns: 1fr;
      }
      .hero-specs-row {
        grid-template-columns: 1fr;
      }
      .case-panel {
        padding: 24px;
      }
      .cta-box {
        padding: 30px;
      }
      .sticky-bottom-bar .bar-text {
        display: none;
      }
      .sticky-bottom-bar {
        justify-content: center;
      }
      .bar-actions {
        width: 100%;
        justify-content: stretch;
      }
      .bar-actions .btn {
        flex: 1;
      }
    }