/* roulang page: index */
/* CSS 设计变量与主题系统 */
    :root {
      --color-primary-dark: #0D2538;
      --color-primary: #134E5E;
      --color-primary-light: #1A6B80;
      --color-accent-cyan: #00B4D8;
      --color-accent-gold: #C59B27;
      --color-bg-main: #F8FAFC;
      --color-bg-alt: #F1F5F9;
      --color-bg-card: #FFFFFF;
      --color-bg-dark: #091E2A;
      --color-bg-dark-card: #102B3C;
      --color-text-title: #0F172A;
      --color-text-body: #334155;
      --color-text-muted: #64748B;
      --color-text-light: #E2E8F0;
      --color-border: rgba(15, 23, 42, 0.08);
      --color-border-dark: rgba(255, 255, 255, 0.12);
      --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.04);
      --shadow-md: 0 4px 20px -2px rgba(13, 37, 56, 0.08);
      --shadow-lg: 0 12px 32px -4px rgba(13, 37, 56, 0.12);
      --shadow-cyan: 0 4px 20px rgba(0, 180, 216, 0.25);
      --radius-sm: 6px;
      --radius-md: 10px;
      --radius-lg: 16px;
      --radius-full: 9999px;
      --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
      --container-max: 1240px;
    }

    /* 基础重置 */
    *, *::before, *::after {
      box-sizing: border-box;
      margin: 0;
      padding: 0;
    }

    html {
      scroll-behavior: smooth;
      font-size: 16px;
      -webkit-text-size-adjust: 100%;
    }

    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
      background-color: var(--color-bg-main);
      color: var(--color-text-body);
      line-height: 1.7;
      overflow-x: hidden;
    }

    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: inherit;
      outline: none;
    }

    ul, ol {
      list-style: none;
    }

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

    .section {
      padding: 90px 0;
      position: relative;
    }

    .section-alt {
      background-color: var(--color-bg-alt);
    }

    .section-dark {
      background-color: var(--color-bg-dark);
      color: var(--color-text-light);
    }

    /* 标头通用排版 */
    .section-header {
      text-align: center;
      max-width: 800px;
      margin: 0 auto 60px;
    }

    .badge-tag {
      display: inline-flex;
      align-items: center;
      gap: 6px;
      padding: 6px 14px;
      background: rgba(0, 180, 216, 0.1);
      border: 1px solid rgba(0, 180, 216, 0.25);
      color: var(--color-primary);
      font-size: 0.85rem;
      font-weight: 600;
      border-radius: var(--radius-full);
      margin-bottom: 16px;
      letter-spacing: 0.5px;
    }

    .section-dark .badge-tag {
      background: rgba(0, 180, 216, 0.15);
      border-color: rgba(0, 180, 216, 0.4);
      color: var(--color-accent-cyan);
    }

    .section-title {
      font-size: 2.1rem;
      font-weight: 800;
      color: var(--color-text-title);
      line-height: 1.35;
      margin-bottom: 18px;
      letter-spacing: -0.5px;
    }

    .section-dark .section-title {
      color: #FFFFFF;
    }

    .section-subtitle {
      font-size: 1.05rem;
      color: var(--color-text-muted);
      line-height: 1.75;
    }

    .section-dark .section-subtitle {
      color: #94A3B8;
    }

    /* 按钮系统 */
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: 8px;
      padding: 13px 28px;
      font-size: 0.95rem;
      font-weight: 600;
      border-radius: var(--radius-md);
      cursor: pointer;
      border: 1px solid transparent;
      transition: var(--transition);
      text-align: center;
      white-space: nowrap;
    }

    .btn-primary {
      background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
      color: #FFFFFF;
      box-shadow: 0 4px 14px rgba(19, 78, 94, 0.3);
    }

    .btn-primary:hover {
      background: linear-gradient(135deg, var(--color-primary-light) 0%, var(--color-primary) 100%);
      transform: translateY(-2px);
      box-shadow: 0 6px 20px rgba(19, 78, 94, 0.4);
      color: #FFFFFF;
    }

    .btn-cyan {
      background: var(--color-accent-cyan);
      color: #051A24;
      font-weight: 700;
      box-shadow: var(--shadow-cyan);
    }

    .btn-cyan:hover {
      background: #33C6E5;
      transform: translateY(-2px);
      box-shadow: 0 6px 24px rgba(0, 180, 216, 0.4);
      color: #051A24;
    }

    .btn-outline {
      background: transparent;
      border-color: rgba(19, 78, 94, 0.3);
      color: var(--color-primary-dark);
    }

    .btn-outline:hover {
      background: rgba(19, 78, 94, 0.05);
      border-color: var(--color-primary);
      transform: translateY(-2px);
    }

    .btn-outline-white {
      background: rgba(255, 255, 255, 0.06);
      border-color: rgba(255, 255, 255, 0.3);
      color: #FFFFFF;
    }

    .btn-outline-white:hover {
      background: rgba(255, 255, 255, 0.15);
      border-color: #FFFFFF;
      transform: translateY(-2px);
      color: #FFFFFF;
    }

    /* 顶部微型工具栏 */
    .topbar {
      background: #061520;
      color: #94A3B8;
      font-size: 0.8rem;
      border-bottom: 1px solid rgba(255, 255, 255, 0.06);
      padding: 7px 0;
    }

    .topbar-inner {
      display: flex;
      justify-content: space-between;
      align-items: center;
    }

    .topbar-meta {
      display: flex;
      align-items: center;
      gap: 20px;
    }

    .topbar-meta span {
      display: inline-flex;
      align-items: center;
      gap: 6px;
    }

    /* 粘性主导航 */
    .site-header {
      position: sticky;
      top: 0;
      z-index: 1000;
      background: rgba(255, 255, 255, 0.95);
      backdrop-filter: blur(12px);
      border-bottom: 1px solid var(--color-border);
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
    }

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

    .brand-logo {
      display: flex;
      align-items: center;
      gap: 12px;
      font-weight: 800;
      font-size: 1.35rem;
      color: var(--color-primary-dark);
      letter-spacing: -0.3px;
    }

    .brand-logo-icon {
      width: 38px;
      height: 38px;
      background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
      border-radius: 8px;
      display: flex;
      align-items: center;
      justify-content: center;
      color: #FFFFFF;
      box-shadow: 0 4px 10px rgba(19, 78, 94, 0.25);
    }

    .brand-logo-text {
      display: flex;
      flex-direction: column;
      line-height: 1.15;
    }

    .brand-logo-text span:first-child {
      font-size: 1.25rem;
      font-weight: 800;
      color: var(--color-primary-dark);
    }

    .brand-logo-text span:last-child {
      font-size: 0.68rem;
      font-weight: 600;
      color: var(--color-accent-cyan);
      letter-spacing: 1px;
      text-transform: uppercase;
    }

    .main-nav {
      display: flex;
      align-items: center;
      gap: 28px;
    }

    .nav-link {
      font-size: 0.95rem;
      font-weight: 600;
      color: var(--color-text-body);
      padding: 6px 0;
      position: relative;
    }

    .nav-link::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background: var(--color-primary);
      transition: var(--transition);
    }

    .nav-link:hover {
      color: var(--color-primary);
    }

    .nav-link:hover::after,
    .nav-link.active::after {
      width: 100%;
    }

    .nav-actions {
      display: flex;
      align-items: center;
      gap: 14px;
    }

    .mobile-menu-btn {
      display: none;
      background: none;
      border: none;
      cursor: pointer;
      padding: 8px;
      color: var(--color-primary-dark);
    }

    /* 板块 1：首屏高转化 Hero 轮播大图区 */
    .hero-section {
      position: relative;
      background-color: var(--color-primary-dark);
      color: #FFFFFF;
      padding: 100px 0 120px;
      overflow: hidden;
      min-height: 640px;
      display: flex;
      align-items: center;
    }

    .hero-bg {
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      height: 100%;
      object-fit: cover;
      opacity: 0.18;
      filter: saturate(1.2);
    }

    .hero-overlay {
      position: absolute;
      inset: 0;
      background: radial-gradient(circle at 70% 30%, rgba(0, 180, 216, 0.12) 0%, transparent 60%),
                  linear-gradient(to right, rgba(13, 37, 56, 0.98) 35%, rgba(13, 37, 56, 0.85) 100%);
    }

    .hero-grid {
      position: relative;
      z-index: 2;
      display: grid;
      grid-template-columns: 1.15fr 0.85fr;
      gap: 48px;
      align-items: center;
    }

    .hero-content h1 {
      font-size: 2.85rem;
      font-weight: 800;
      line-height: 1.25;
      letter-spacing: -0.8px;
      margin-bottom: 22px;
      color: #FFFFFF;
    }

    .hero-content h1 .text-highlight {
      background: linear-gradient(135deg, #00B4D8 0%, #70E000 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
    }

    .hero-desc {
      font-size: 1.12rem;
      line-height: 1.8;
      color: #CBD5E1;
      margin-bottom: 36px;
      max-width: 620px;
    }

    .hero-cta-group {
      display: flex;
      flex-wrap: wrap;
      gap: 16px;
      align-items: center;
      margin-bottom: 40px;
    }

    .hero-trust-bar {
      display: flex;
      align-items: center;
      gap: 24px;
      padding-top: 24px;
      border-top: 1px solid rgba(255, 255, 255, 0.12);
    }

    .trust-item {
      display: flex;
      align-items: center;
      gap: 8px;
      font-size: 0.85rem;
      color: #94A3B8;
    }

    .trust-item svg {
      color: var(--color-accent-cyan);
    }

    /* Hero 右侧动态指标轮播卡片 */
    .hero-carousel-card {
      background: rgba(16, 43, 60, 0.85);
      border: 1px solid rgba(255, 255, 255, 0.14);
      backdrop-filter: blur(16px);
      border-radius: var(--radius-lg);
      padding: 32px;
      box-shadow: 0 20px 50px rgba(0, 0, 0, 0.35);
      position: relative;
    }

    .carousel-badge {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      background: rgba(0, 180, 216, 0.2);
      color: var(--color-accent-cyan);
      padding: 5px 12px;
      border-radius: var(--radius-full);
      font-size: 0.78rem;
      font-weight: 700;
      margin-bottom: 20px;
    }

    .carousel-pulse {
      width: 8px;
      height: 8px;
      background: var(--color-accent-cyan);
      border-radius: 50%;
      animation: pulse 1.8s infinite;
    }

    @keyframes pulse {
      0% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(0, 180, 216, 0.7); }
      70% { transform: scale(1); box-shadow: 0 0 0 10px rgba(0, 180, 216, 0); }
      100% { transform: scale(0.95); box-shadow: 0 0 0 0 rgba(0, 180, 216, 0); }
    }

    .carousel-slides {
      position: relative;
      min-height: 240px;
    }

    .carousel-slide {
      opacity: 0;
      position: absolute;
      top: 0;
      left: 0;
      width: 100%;
      pointer-events: none;
      transition: opacity 0.5s ease;
    }

    .carousel-slide.active {
      opacity: 1;
      position: relative;
      pointer-events: auto;
    }

    .slide-title {
      font-size: 1.25rem;
      font-weight: 700;
      color: #FFFFFF;
      margin-bottom: 12px;
    }

    .slide-desc {
      font-size: 0.92rem;
      color: #94A3B8;
      line-height: 1.65;
      margin-bottom: 20px;
    }

    .metric-row {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 16px;
      background: rgba(0, 0, 0, 0.2);
      padding: 16px;
      border-radius: var(--radius-md);
      border: 1px solid rgba(255, 255, 255, 0.05);
    }

    .metric-box-val {
      font-size: 1.45rem;
      font-weight: 800;
      color: var(--color-accent-cyan);
    }

    .metric-box-lbl {
      font-size: 0.78rem;
      color: #94A3B8;
    }

    .carousel-dots {
      display: flex;
      gap: 8px;
      margin-top: 24px;
      justify-content: center;
    }

    .carousel-dot {
      width: 24px;
      height: 4px;
      background: rgba(255, 255, 255, 0.2);
      border-radius: 2px;
      cursor: pointer;
      transition: var(--transition);
    }

    .carousel-dot.active {
      background: var(--color-accent-cyan);
      width: 36px;
    }

    /* 板块 2：品牌与产品可信验证介绍区 */
    .verify-grid {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 60px;
      align-items: center;
    }

    .verify-timeline {
      display: flex;
      flex-direction: column;
      gap: 24px;
    }

    .timeline-step {
      display: flex;
      gap: 20px;
    }

    .step-num {
      width: 44px;
      height: 44px;
      flex-shrink: 0;
      background: #E0F2FE;
      color: var(--color-primary);
      font-weight: 800;
      font-size: 1.1rem;
      border-radius: var(--radius-md);
      display: flex;
      align-items: center;
      justify-content: center;
      border: 1px solid rgba(19, 78, 94, 0.15);
    }

    .step-content h3 {
      font-size: 1.15rem;
      font-weight: 700;
      color: var(--color-text-title);
      margin-bottom: 6px;
    }

    .step-content p {
      font-size: 0.92rem;
      color: var(--color-text-muted);
      line-height: 1.6;
    }

    .verify-card {
      background: #FFFFFF;
      border-radius: var(--radius-lg);
      border: 1px solid var(--color-border);
      padding: 32px;
      box-shadow: var(--shadow-md);
      position: relative;
    }

    .verify-img-wrap {
      border-radius: var(--radius-md);
      overflow: hidden;
      margin-bottom: 24px;
      border: 1px solid var(--color-border);
    }

    .verify-param-box {
      background: #F0FDF4;
      border: 1px solid #BBF7D0;
      border-radius: var(--radius-md);
      padding: 16px 20px;
      margin-top: 20px;
    }

    .verify-param-title {
      font-size: 0.88rem;
      font-weight: 700;
      color: #166534;
      display: flex;
      align-items: center;
      gap: 8px;
      margin-bottom: 6px;
    }

    .verify-param-desc {
      font-size: 0.85rem;
      color: #15803D;
      line-height: 1.55;
    }

    /* 板块 3：核心技术与优势矩阵区 (6 卡片) */
    .features-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }

    .feature-card {
      background: #FFFFFF;
      border-radius: var(--radius-lg);
      border: 1px solid var(--color-border);
      padding: 36px 30px;
      box-shadow: var(--shadow-sm);
      transition: var(--transition);
      position: relative;
      display: flex;
      flex-direction: column;
    }

    .feature-card:hover {
      transform: translateY(-6px);
      box-shadow: var(--shadow-md);
      border-color: rgba(19, 78, 94, 0.25);
    }

    .feature-icon-box {
      width: 56px;
      height: 56px;
      background: rgba(19, 78, 94, 0.08);
      color: var(--color-primary);
      border-radius: var(--radius-md);
      display: flex;
      align-items: center;
      justify-content: center;
      margin-bottom: 24px;
      transition: var(--transition);
    }

    .feature-card:hover .feature-icon-box {
      background: var(--color-primary);
      color: #FFFFFF;
      transform: scale(1.08);
    }

    .feature-card h3 {
      font-size: 1.2rem;
      font-weight: 700;
      color: var(--color-text-title);
      margin-bottom: 12px;
    }

    .feature-card p {
      font-size: 0.92rem;
      color: var(--color-text-muted);
      line-height: 1.65;
      margin-bottom: 20px;
      flex-grow: 1;
    }

    .feature-tag-list {
      display: flex;
      flex-wrap: wrap;
      gap: 8px;
      margin-top: auto;
    }

    .feature-mini-tag {
      font-size: 0.75rem;
      padding: 3px 8px;
      background: #F1F5F9;
      color: #475569;
      border-radius: var(--radius-sm);
      font-weight: 500;
    }

    /* 板块 4：产品矩阵与商业解决方案区 (3 卡片) */
    .matrix-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 30px;
      align-items: stretch;
    }

    .matrix-card {
      background: #FFFFFF;
      border-radius: var(--radius-lg);
      border: 1px solid var(--color-border);
      padding: 36px 32px;
      box-shadow: var(--shadow-sm);
      display: flex;
      flex-direction: column;
      position: relative;
      transition: var(--transition);
    }

    .matrix-card.highlight {
      border: 2px solid var(--color-primary);
      box-shadow: var(--shadow-lg);
      transform: scale(1.03);
      z-index: 2;
    }

    .matrix-card.highlight::before {
      content: '行业主流首选架构';
      position: absolute;
      top: -14px;
      left: 50%;
      transform: translateX(-50%);
      background: var(--color-accent-gold);
      color: #FFFFFF;
      padding: 4px 16px;
      border-radius: var(--radius-full);
      font-size: 0.78rem;
      font-weight: 700;
      letter-spacing: 0.5px;
    }

    .matrix-head {
      margin-bottom: 24px;
      border-bottom: 1px solid var(--color-border);
      padding-bottom: 20px;
    }

    .matrix-title {
      font-size: 1.35rem;
      font-weight: 800;
      color: var(--color-text-title);
      margin-bottom: 8px;
    }

    .matrix-target {
      font-size: 0.85rem;
      color: var(--color-accent-cyan);
      font-weight: 600;
    }

    .matrix-desc {
      font-size: 0.92rem;
      color: var(--color-text-muted);
      margin-bottom: 24px;
      line-height: 1.6;
    }

    .matrix-checklist {
      margin-bottom: 32px;
      flex-grow: 1;
    }

    .matrix-checklist li {
      display: flex;
      align-items: flex-start;
      gap: 10px;
      font-size: 0.9rem;
      color: var(--color-text-body);
      margin-bottom: 12px;
      line-height: 1.5;
    }

    .matrix-checklist svg {
      color: #10B981;
      flex-shrink: 0;
      margin-top: 3px;
    }

    /* 板块 5：深色高对比版权保护理念与行业痛点区 */
    .pain-points-grid {
      display: grid;
      grid-template-columns: 0.9fr 1.1fr;
      gap: 60px;
      align-items: center;
    }

    .pain-point-text h2 {
      font-size: 2.2rem;
      font-weight: 800;
      line-height: 1.3;
      margin-bottom: 20px;
      color: #FFFFFF;
    }

    .pain-point-text p {
      font-size: 1.05rem;
      color: #94A3B8;
      line-height: 1.8;
      margin-bottom: 30px;
    }

    .pain-compare-matrix {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 20px;
    }

    .compare-card {
      background: var(--color-bg-dark-card);
      border-radius: var(--radius-md);
      padding: 24px;
      border: 1px solid var(--color-border-dark);
    }

    .compare-card.danger {
      border-left: 4px solid #EF4444;
    }

    .compare-card.success {
      border-left: 4px solid #10B981;
    }

    .compare-tag {
      font-size: 0.75rem;
      font-weight: 700;
      margin-bottom: 10px;
      text-transform: uppercase;
    }

    .danger .compare-tag { color: #EF4444; }
    .success .compare-tag { color: #10B981; }

    .compare-card h4 {
      font-size: 1.05rem;
      font-weight: 700;
      color: #FFFFFF;
      margin-bottom: 8px;
    }

    .compare-card p {
      font-size: 0.85rem;
      color: #94A3B8;
      line-height: 1.55;
    }

    /* 板块 6：客户标杆案例与落地场景演示区 */
    .cases-tabs {
      display: flex;
      justify-content: center;
      gap: 16px;
      margin-bottom: 40px;
      flex-wrap: wrap;
    }

    .tab-btn {
      padding: 10px 24px;
      background: #FFFFFF;
      border: 1px solid var(--color-border);
      border-radius: var(--radius-full);
      font-weight: 600;
      font-size: 0.95rem;
      color: var(--color-text-body);
      cursor: pointer;
      transition: var(--transition);
    }

    .tab-btn:hover,
    .tab-btn.active {
      background: var(--color-primary);
      color: #FFFFFF;
      border-color: var(--color-primary);
      box-shadow: 0 4 <style>
  body {
   font-family: Arial, sans-serif;
   margin: 0;
   padding: 0;
   background-color: #f4f4f4;
  }
  .container {
   max-width: 960px;
   margin: 20px auto;
   background-color: #fff;
   padding: 20px;
   border-radius: 8px;
   box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
  }
  h1 {
   text-align: center;
   color: #333;
  }
  p {
   color: #555;
   line-height: 1.6;
  }
  .button-container {
   text-align: center;
   margin-top: 20px;
  }
  button {
   background-color: #4CAF50;
   color: white;
   padding: 10px 20px;
   border: none;
   border-radius: 4px;
   cursor: pointer;
  }
  button:hover {
   background-color: #3e8e41;
  }

body {
   font-family: Arial, sans-serif;
   margin: 0;
   padding: 0;
   background-color: #f4f4f4;
  }
  .container {
   max-width: 960px;
   margin: 20px auto;
   background-color: #fff;
   padding: 20px;
   border-radius: 8px;
   box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
  }
  h1 {
   text-align: center;
   color: #333;
  }
  p {
   color: #555;
   line-height: 1.6;
  }
  .button-container {
   text-align: center;
   margin-top: 20px;
  }
  button {
   background-color: #4CAF50;
   color: white;
   padding: 10px 20px;
   border: none;
   border-radius: 4px;
   cursor: pointer;
  }
  button:hover {
   background-color: #3e8e41;
  }