/* roulang page: index */
:root {
      --bg-main: #F8FAFC;
      --bg-white: #FFFFFF;
      --bg-dark: #0B132B;
      --primary: #1D4ED8;
      --primary-hover: #1E40AF;
      --accent: #0284C7;
      --text-main: #0F172A;
      --text-muted: #64748B;
      --border-color: #E2E8F0;
      --radius-sm: 6px;
      --radius-md: 10px;
      --radius-lg: 14px;
      --shadow-sm: 0 1px 3px rgba(15, 23, 42, 0.06);
      --shadow-md: 0 4px 6px -1px rgba(15, 23, 42, 0.05), 0 10px 15px -3px rgba(15, 23, 42, 0.08);
      --shadow-lg: 0 12px 24px -4px rgba(15, 23, 42, 0.12);
      --container-max: 1200px;
      --font-stack: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
    }

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

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

    body {
      background-color: var(--bg-main);
      color: var(--text-main);
      font-family: var(--font-stack);
      line-height: 1.65;
      -webkit-font-smoothing: antialiased;
    }

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

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

    ul, ol {
      list-style: none;
    }

    .container {
      width: 100%;
      max-width: var(--container-max);
      margin: 0 auto;
      padding: 0 24px;
    }

    /* 顶部信息条 */
    .top-bar {
      background-color: #F1F5F9;
      border-bottom: 1px solid var(--border-color);
      font-size: 13px;
      color: var(--text-muted);
      height: 38px;
      display: flex;
      align-items: center;
    }
    .top-bar-inner {
      display: flex;
      justify-content: space-between;
      align-items: center;
      width: 100%;
    }
    .top-bar-left span {
      margin-right: 20px;
    }
    .status-badge {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      color: #059669;
      font-weight: 500;
    }
    .status-dot {
      width: 8px;
      height: 8px;
      background-color: #10B981;
      border-radius: 50%;
      box-shadow: 0 0 0 2px rgba(16, 185, 129, 0.2);
    }

    /* 主导航 */
    .site-header {
      background-color: var(--bg-white);
      border-bottom: 1px solid var(--border-color);
      position: sticky;
      top: 0;
      z-index: 100;
      box-shadow: var(--shadow-sm);
    }
    .nav-inner {
      height: 72px;
      display: flex;
      align-items: center;
      justify-content: space-between;
    }
    .brand-logo {
      display: flex;
      align-items: center;
      gap: 12px;
      font-weight: 700;
      font-size: 19px;
      color: var(--text-main);
      letter-spacing: -0.3px;
    }
    .brand-mark {
      width: 38px;
      height: 38px;
      background: linear-gradient(135deg, var(--primary), var(--accent));
      border-radius: 8px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: #fff;
      font-weight: 800;
      font-size: 18px;
    }
    .nav-menu {
      display: flex;
      align-items: center;
      gap: 28px;
    }
    .nav-item {
      font-size: 15px;
      font-weight: 500;
      color: #334155;
    }
    .nav-item:hover, .nav-item.active {
      color: var(--primary);
    }
    .btn-nav {
      background-color: var(--primary);
      color: #ffffff;
      padding: 10px 20px;
      border-radius: var(--radius-sm);
      font-size: 14px;
      font-weight: 600;
      display: inline-block;
      transition: background 0.2s, transform 0.2s;
    }
    .btn-nav:hover {
      background-color: var(--primary-hover);
      transform: translateY(-1px);
    }
    .mobile-toggle {
      display: none;
      background: none;
      border: none;
      font-size: 24px;
      cursor: pointer;
      color: var(--text-main);
    }

    /* 板块通用框架 */
    .section-wrap {
      padding: 90px 0;
      position: relative;
    }
    .bg-alt {
      background-color: var(--bg-white);
      border-top: 1px solid var(--border-color);
      border-bottom: 1px solid var(--border-color);
    }
    .bg-dark-accent {
      background-color: var(--bg-dark);
      color: #E2E8F0;
    }
    .section-heading {
      text-align: center;
      max-width: 800px;
      margin: 0 auto 56px auto;
    }
    .section-tag {
      display: inline-block;
      font-size: 13px;
      font-weight: 600;
      text-transform: uppercase;
      color: var(--accent);
      background-color: #E0F2FE;
      padding: 4px 14px;
      border-radius: 20px;
      margin-bottom: 12px;
    }
    .bg-dark-accent .section-tag {
      background-color: rgba(2, 132, 199, 0.25);
      color: #38BDF8;
    }
    .section-title {
      font-size: 32px;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 16px;
      letter-spacing: -0.5px;
    }
    .bg-dark-accent .section-title {
      color: #FFFFFF;
    }
    .section-subtext {
      font-size: 16px;
      color: var(--text-muted);
      line-height: 1.7;
    }
    .bg-dark-accent .section-subtext {
      color: #94A3B8;
    }

    /* 板块 1: Hero */
    .hero-section {
      background: linear-gradient(180deg, #F1F5F9 0%, #F8FAFC 100%);
      padding: 80px 0 100px 0;
      border-bottom: 1px solid var(--border-color);
    }
    .hero-grid {
      display: grid;
      grid-template-columns: 1.15fr 0.85fr;
      gap: 48px;
      align-items: center;
    }
    .hero-badge {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      background: #EFF6FF;
      border: 1px solid #BFDBFE;
      color: var(--primary);
      padding: 6px 14px;
      border-radius: 20px;
      font-size: 13px;
      font-weight: 600;
      margin-bottom: 20px;
    }
    .hero-h1 {
      font-size: 44px;
      line-height: 1.25;
      font-weight: 800;
      color: var(--text-main);
      margin-bottom: 24px;
      letter-spacing: -1px;
    }
    .hero-lead {
      font-size: 17px;
      line-height: 1.8;
      color: #475569;
      margin-bottom: 32px;
    }
    .hero-actions {
      display: flex;
      gap: 16px;
      margin-bottom: 36px;
    }
    .btn-primary {
      background-color: var(--primary);
      color: #fff;
      padding: 13px 28px;
      border-radius: var(--radius-sm);
      font-size: 15px;
      font-weight: 600;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      box-shadow: 0 4px 12px rgba(29, 78, 216, 0.25);
      transition: all 0.2s ease;
    }
    .btn-primary:hover {
      background-color: var(--primary-hover);
      transform: translateY(-2px);
      box-shadow: 0 6px 16px rgba(29, 78, 216, 0.35);
    }
    .btn-secondary {
      background-color: #fff;
      color: var(--text-main);
      border: 1px solid var(--border-color);
      padding: 13px 28px;
      border-radius: var(--radius-sm);
      font-size: 15px;
      font-weight: 600;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      transition: all 0.2s ease;
    }
    .btn-secondary:hover {
      background-color: #F1F5F9;
      border-color: #CBD5E1;
    }
    .hero-feature-tags {
      display: flex;
      flex-wrap: wrap;
      gap: 20px;
      padding-top: 16px;
      border-top: 1px solid var(--border-color);
      font-size: 14px;
      color: #475569;
    }
    .hero-feature-item {
      display: flex;
      align-items: center;
      gap: 6px;
    }
    .hero-feature-icon {
      color: var(--accent);
      font-weight: bold;
    }
    .hero-visual {
      position: relative;
    }
    .hero-img-card {
      border-radius: var(--radius-lg);
      overflow: hidden;
      box-shadow: var(--shadow-lg);
      border: 1px solid rgba(255, 255, 255, 0.8);
      position: relative;
      background: #0F172A;
    }
    .hero-img-card img {
      width: 100%;
      height: 420px;
      object-fit: cover;
      opacity: 0.92;
    }
    .hero-floating-stat {
      position: absolute;
      bottom: -24px;
      left: 24px;
      background: #FFFFFF;
      padding: 18px 24px;
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-md);
      border: 1px solid var(--border-color);
      display: flex;
      align-items: center;
      gap: 16px;
    }
    .floating-stat-num {
      font-size: 28px;
      font-weight: 800;
      color: var(--primary);
      line-height: 1;
    }
    .floating-stat-label {
      font-size: 13px;
      color: var(--text-muted);
      line-height: 1.4;
    }

    /* 板块 2: 数据条 */
    .metric-strip-section {
      padding: 40px 0;
      margin-top: -30px;
      position: relative;
      z-index: 10;
    }
    .metric-card-container {
      background: var(--bg-white);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      box-shadow: var(--shadow-md);
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      padding: 32px 16px;
    }
    .metric-col {
      text-align: center;
      padding: 0 20px;
      border-right: 1px solid var(--border-color);
    }
    .metric-col:last-child {
      border-right: none;
    }
    .metric-val {
      font-size: 38px;
      font-weight: 800;
      color: var(--primary);
      margin-bottom: 6px;
      letter-spacing: -0.5px;
    }
    .metric-name {
      font-size: 15px;
      font-weight: 600;
      color: var(--text-main);
      margin-bottom: 4px;
    }
    .metric-desc {
      font-size: 12px;
      color: var(--text-muted);
    }

    /* 板块 3: 底座架构 */
    .base-arch-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 56px;
      align-items: center;
    }
    .base-arch-img-wrap {
      border-radius: var(--radius-md);
      overflow: hidden;
      box-shadow: var(--shadow-md);
      border: 1px solid var(--border-color);
    }
    .base-arch-img-wrap img {
      width: 100%;
      height: 380px;
    }
    .arch-specs-list {
      margin-top: 24px;
      display: flex;
      flex-direction: column;
      gap: 16px;
    }
    .arch-spec-item {
      display: flex;
      align-items: flex-start;
      gap: 14px;
    }
    .spec-icon-box {
      width: 32px;
      height: 32px;
      border-radius: 6px;
      background: #EFF6FF;
      color: var(--primary);
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      font-size: 14px;
      flex-shrink: 0;
    }
    .spec-text h4 {
      font-size: 16px;
      font-weight: 600;
      color: var(--text-main);
      margin-bottom: 4px;
    }
    .spec-text p {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* 板块 4: 服务矩阵 6 卡片 */
    .services-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    .service-card {
      background: var(--bg-white);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 32px 26px;
      box-shadow: var(--shadow-sm);
      transition: transform 0.2s, box-shadow 0.2s, border-color 0.2s;
      position: relative;
    }
    .service-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
      border-color: #BFDBFE;
    }
    .service-badge {
      position: absolute;
      top: 24px;
      right: 24px;
      font-size: 12px;
      padding: 3px 10px;
      border-radius: 12px;
      background-color: #F1F5F9;
      color: #475569;
      font-weight: 600;
    }
    .service-icon {
      width: 48px;
      height: 48px;
      border-radius: 8px;
      background: linear-gradient(135deg, #DBEAFE, #EFF6FF);
      color: var(--primary);
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 20px;
      font-weight: 700;
      margin-bottom: 20px;
    }
    .service-title {
      font-size: 19px;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 12px;
    }
    .service-summary {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.65;
      margin-bottom: 20px;
    }
    .service-traits {
      border-top: 1px solid #F1F5F9;
      padding-top: 16px;
      display: flex;
      flex-direction: column;
      gap: 8px;
      font-size: 13px;
      color: #334155;
    }
    .service-traits li {
      display: flex;
      align-items: center;
      gap: 8px;
    }
    .service-traits li::before {
      content: "•";
      color: var(--accent);
      font-weight: bold;
    }

    /* 板块 5: 方案组合 3 卡片 */
    .plans-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 30px;
      align-items: stretch;
    }
    .plan-card {
      background: var(--bg-white);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-lg);
      padding: 40px 30px;
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
      position: relative;
    }
    .plan-card.featured {
      border: 2px solid var(--primary);
      box-shadow: var(--shadow-lg);
      transform: scale(1.02);
      z-index: 2;
    }
    .plan-corner-tag {
      position: absolute;
      top: -14px;
      left: 50%;
      transform: translateX(-50%);
      background: var(--primary);
      color: #fff;
      font-size: 12px;
      font-weight: 700;
      padding: 4px 16px;
      border-radius: 20px;
    }
    .plan-tier-name {
      font-size: 21px;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 12px;
    }
    .plan-tier-intro {
      font-size: 14px;
      color: var(--text-muted);
      margin-bottom: 24px;
      line-height: 1.6;
    }
    .plan-specs-box {
      background-color: #F8FAFC;
      border-radius: 8px;
      padding: 16px;
      margin-bottom: 24px;
      font-size: 13px;
    }
    .plan-spec-row {
      display: flex;
      justify-content: space-between;
      margin-bottom: 8px;
      color: #475569;
    }
    .plan-spec-row:last-child {
      margin-bottom: 0;
    }
    .plan-spec-row strong {
      color: var(--text-main);
    }
    .plan-checklist {
      margin-bottom: 32px;
      flex-grow: 1;
      display: flex;
      flex-direction: column;
      gap: 12px;
      font-size: 14px;
      color: #334155;
    }
    .plan-checklist li {
      display: flex;
      align-items: center;
      gap: 10px;
    }
    .plan-checklist li span.check {
      color: #10B981;
      font-weight: bold;
    }

    /* 板块 6: 沉浸式内核剖析 (深色) */
    .tech-deep-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 60px;
      align-items: center;
    }
    .deep-narrative {
      display: flex;
      flex-direction: column;
      gap: 28px;
    }
    .deep-narrative-item {
      border-left: 2px solid #334155;
      padding-left: 20px;
      transition: border-color 0.2s;
    }
    .deep-narrative-item:hover {
      border-color: var(--accent);
    }
    .deep-narrative-title {
      font-size: 18px;
      font-weight: 700;
      color: #F8FAFC;
      margin-bottom: 8px;
    }
    .deep-narrative-desc {
      font-size: 14px;
      color: #94A3B8;
      line-height: 1.65;
    }
    .console-mockup {
      background: #020617;
      border: 1px solid #1E293B;
      border-radius: var(--radius-md);
      overflow: hidden;
      box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.5);
    }
    .console-header {
      background: #0F172A;
      padding: 12px 18px;
      display: flex;
      align-items: center;
      gap: 8px;
      border-bottom: 1px solid #1E293B;
    }
    .console-dot {
      width: 10px;
      height: 10px;
      border-radius: 50%;
    }
    .dot-red { background: #EF4444; }
    .dot-yellow { background: #F59E0B; }
    .dot-green { background: #10B981; }
    .console-body {
      padding: 20px;
      font-family: "Courier New", Courier, monospace;
      font-size: 13px;
      line-height: 1.7;
      color: #38BDF8;
    }
    .console-body span.muted { color: #64748B; }
    .console-body span.white { color: #F8FAFC; }
    .console-body span.success { color: #34D399; }

    /* 板块 7: 行业实操 */
    .scenario-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }
    .scenario-card {
      background: var(--bg-white);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
      transition: all 0.2s ease;
    }
    .scenario-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
    }
    .scenario-img-box {
      height: 160px;
      background-color: #E2E8F0;
      position: relative;
    }
    .scenario-img-box img {
      width: 100%;
      height: 100%;
    }
    .scenario-content {
      padding: 20px;
    }
    .scenario-tag-pill {
      font-size: 12px;
      font-weight: 600;
      color: var(--accent);
      margin-bottom: 8px;
      display: inline-block;
    }
    .scenario-name {
      font-size: 16px;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 10px;
    }
    .scenario-detail {
      font-size: 13px;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* 板块 8: 落地实施故事 */
    .story-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 50px;
      align-items: center;
    }
    .story-img-container {
      border-radius: var(--radius-md);
      overflow: hidden;
      border: 1px solid var(--border-color);
      box-shadow: var(--shadow-md);
    }
    .story-img-container img {
      width: 100%;
      height: 400px;
    }
    .story-body h3 {
      font-size: 26px;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 16px;
    }
    .story-body p {
      font-size: 15px;
      color: #475569;
      line-height: 1.75;
      margin-bottom: 24px;
    }
    .story-stat-pills {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 16px;
    }
    .story-stat-card {
      background: #F1F5F9;
      padding: 16px;
      border-radius: 8px;
      border-left: 3px solid var(--primary);
    }
    .story-stat-card .val {
      font-size: 24px;
      font-weight: 800;
      color: var(--primary);
      margin-bottom: 4px;
    }
    .story-stat-card .lbl {
      font-size: 13px;
      color: var(--text-muted);
    }

    /* 板块 9: 评价墙 */
    .testimonial-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }
    .testimonial-card {
      background: var(--bg-white);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding:30px;
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }
    .testimonial-stars {
      color: #F59E0B;
      font-size: 14px;
      margin-bottom: 14px;
      letter-spacing: 2px;
    }
    .testimonial-quote {
      font-size: 14px;
      color: #334155;
      line-height: 1.7;
      margin-bottom: 24px;
    }
    .testimonial-author {
      display: flex;
      align-items: center;
      gap: 12px;
      border-top: 1px solid #F1F5F9;
      padding-top: 16px;
    }
    .author-avatar {
      width: 44px;
      height: 44px;
      border-radius: 50%;
      background: #E2E8F0;
      overflow: hidden;
      flex-shrink: 0;
    }
    .author-avatar img {
      width: 100%;
      height: 100%;
      object-fit: cover;
    }
    .author-name {
      font-size: 14px;
      font-weight: 700;
      color: var(--text-main);
    }
    .author-role {
      font-size: 12px;
      color: var(--text-muted);
    }

    /* 板块 10: 动态技术指南 */
    .guides-layout {
      display: grid;
      grid-template-columns: 1fr 1.2fr;
      gap: 32px;
    }
    .guide-featured {
      background: var(--bg-white);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
    }
    .guide-featured-img {
      height: 220px;
      overflow: hidden;
    }
    .guide-featured-img img {
      width: 100%;
      height: 100%;
    }
    .guide-featured-body {
      padding: 24px;
    }
    .guide-date {
      font-size: 12px;
      color: var(--text-muted);
      margin-bottom: 8px;
    }
    .guide-featured-title {
      font-size: 18px;
      font-weight: 700;
      color: var(--text-main);
      margin-bottom: 12px;
      line-height: 1.4;
    }
    .guide-featured-excerpt {
      font-size: 14px;
      color: var(--text-muted);
      line-height: 1.65;
    }
    .guide-list {
      display: flex;
      flex-direction: column;
      gap: 16px;
    }
    .guide-item {
      background: var(--bg-white);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      padding: 20px;
      display: flex;
      align-items: center;
      gap: 20px;
      box-shadow: var(--shadow-sm);
      transition: border-color 0.2s;
    }
    .guide-item:hover {
      border-color: #BFDBFE;
    }
    .guide-item-thumb {
      width: 110px;
      height: 80px;
      border-radius: 6px;
      overflow: hidden;
      flex-shrink: 0;
    }
    .guide-item-thumb img {
      width: 100%;
      height: 100%;
    }
    .guide-item-info h4 {
      font-size: 15px;
      font-weight: 600;
      color: var(--text-main);
      margin-bottom: 6px;
      line-height: 1.4;
    }
    .guide-item-info p {
      font-size: 13px;
      color: var(--text-muted);
      line-height: 1.5;
    }

    /* 板块 11: FAQ 手风琴 */
    .faq-container {
      max-width: 860px;
      margin: 0 auto;
      display: flex;
      flex-direction: column;
      gap: 14px;
    }
    .faq-item {
      background: var(--bg-white);
      border: 1px solid var(--border-color);
      border-radius: var(--radius-md);
      overflow: hidden;
      transition: border-color 0.2s;
    }
    .faq-item.active {
      border-color: #93C5FD;
    }
    .faq-header {
      padding: 20px 24px;
      cursor: pointer;
      display: flex;
      align-items: center;
      justify-content: space-between;
      user-select: none;
    }
    .faq-question {
      font-size: 16px;
      font-weight: 600;
      color: var(--text-main);
    }
    .faq-icon {
      font-size: 20px;
      font-weight: 300;
      color: var(--primary);
      transition: transform 0.3s ease;
    }
    .faq-item.active .faq-icon {
      transform: rotate(45deg);
    }
    .faq-content {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.3s ease, padding 0.3s ease;
      background: #F8FAFC;
    }
    .faq-item.active .faq-content {
      max-height: 300px;
      padding: 0 24px 20px 24px;
    }
    .faq-content p {
      font-size: 14px;
      color: #475569;
      line-height: 1.7;
    }

    /* 板块 12: 转化表单 CTA */
    .cta-card {
      background: linear-gradient(135deg, #1E40AF 0%, #1D4ED8 50%, #0284C7 100%);
      border-radius: var(--radius-lg);
      padding: 60px 48px;
      color: #FFFFFF;
      box-shadow: var(--shadow-lg);
      display: grid;
      grid-template-columns: 1.1fr 0.9fr;
      gap: 48px;
      align-items: center;
    }
    .cta-text-area h2 {
      font-size: 32px;
      font-weight: 800;
      line-height: 1.3;
      margin-bottom: 16px;
    }
    .cta-text-area p {
      font-size: 15px;
      line-height: 1.75;
      color: #DBEAFE;
      margin-bottom: 24px;
    }
    .cta-sla-tag {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      background: rgba(255, 255, 255, 0.15);
      border: 1px solid rgba(255, 255, 255, 0.25);
      padding: 6px 14px;
      border-radius: 20px;
      font-size: 13px;
    }
    .cta-form {
      background: #FFFFFF;
      padding: 32px;
      border-radius: var(--radius-md);
      box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.2);
    }
    .form-group {
      margin-bottom: 16px;
    }
    .form-label {
      display: block;
      font-size: 13px;
      font-weight: 600;
      color: #334155;
      margin-bottom: 6px;
    }
    .form-input {
      width: 100%;
      height: 42px;
      border: 1px solid var(--border-color);
      border-radius: var(--radius-sm);
      padding: 0 14px;
      font-size: 14px;
      color: var(--text-main);
      outline: none;
      transition: border-color 0.2s;
    }
    .form-input:focus {
      border-color: var(--primary);
    }
    .btn-submit {
      width: 100%;
      height: 44px;
      background: var(--primary);
      color: #FFFFFF;
      border: none;
      border-radius: var(--radius-sm);
      font-size: 15px;
      font-weight: 600;
      cursor: pointer;
      transition: background 0.2s;
      margin-top: 8px;
    }
    .btn-submit:hover {
      background: var(--primary-hover);
    }

    /* 页脚 */
    .site-footer {
      background-color: var(--bg-dark);
      color: #94A3B8;
      font-size: 14px;
      padding-top: 80px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 1.5fr 1fr 1fr 1.2fr;
      gap: 40px;
      padding-bottom: 60px;
      border-bottom: 1px solid #1E293B;
    }
    .footer-col-brand .footer-brand-title {
      color: #F8FAFC;
      font-size: 18px;
      font-weight: 700;
      margin-bottom: 16px;
    }
    .footer-col-brand p {
      line-height: 1.7;
      margin-bottom: 20px;
      font-size: 13px;
    }
    .footer-col h4 {
      color: #F8FAFC;
      font-size: 15px;
      font-weight: 600;
      margin-bottom: 20px;
    }
    .footer-links {
      display: flex;
      flex-direction: column;
      gap: 12px;
    }
    .footer-links a:hover {
      color: #38BDF8;
    }
    .footer-contact-list {
      display: flex;
      flex-direction: column;
      gap: 12px;
      font-size: 13px;
    }
    .footer-bottom-bar {
      padding: 24px 0;
      text-align: center;
      font-size: 12px;
      color: #64748B;
      display: flex;
      flex-direction: column;
      gap: 8px;
    }
    .footer-bottom-bar a {
      color: #64748B;
    }
    .footer-bottom-bar a:hover {
      color: #94A3B8;
    }

    /* 响应式样式适配 */
    @media (max-width: 1024px) {
      .services-grid, .testimonial-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .scenario-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .hero-grid, .base-arch-grid, .tech-deep-grid, .story-grid, .guides-layout, .cta-card {
        grid-template-columns: 1fr;
        gap: 40px;
      }
      .footer-grid {
        grid-template-columns: 1fr 1fr;
      }
      .metric-card-container {
        grid-template-columns: repeat(2, 1fr);
        gap: 20px;
      }
      .metric-col {
        border-right: none;
      }
      .metric-col:nth-child(1), .metric-col:nth-child(2) {
        border-bottom: 1px solid var(--border-color);
        padding-bottom: 20px;
      }
    }

    @media (max-width: 768px) {
      .top-bar {
        display: none;
      }
      .nav-menu, .btn-nav {
        display: none;
      }
      .mobile-toggle {
        display: block;
      }
      .nav-menu.open {
        display: flex;
        flex-direction: column;
        position: absolute;
        top: 72px;
        left: 0;
        width: 100%;
        background: #FFFFFF;
        box-shadow: var(--shadow-md);
        padding: 24px;
        border-bottom: 1px solid var(--border-color);
        gap: 16px;
      }
      .hero-h1 {
        font-size: 32px;
      }
      .plans-grid, .services-grid, .scenario-grid, .testimonial-grid {
        grid-template-columns: 1fr;
      }
      .metric-card-container {
        grid-template-columns: 1fr;
      }
      .metric-col {
        border-bottom: 1px solid var(--border-color);
        padding: 16px 0;
      }
      .metric-col:last-child {
        border-bottom: none;
      }
      .footer-grid {
        grid-template-columns: 1fr;
        gap: 30px;
      }
      .section-wrap {
        padding: 60px 0;
      }
      .cta-card {
        padding: 36px 20px;
      }
    }