/* roulang page: index */
:root {
      --bg-base: #F8FAFC;
      --color-primary: #0F172A;
      --color-accent: #0D9488;
      --color-accent-hover: #0F766E;
      --color-surface: #FFFFFF;
      --color-surface-soft: #F1F5F9;
      --color-border: #E2E8F0;
      --color-dark-section: #0B0F19;
      --text-main: #334155;
      --text-title: #0F172A;
      --text-muted: #64748B;
      --radius-sm: 6px;
      --radius-md: 12px;
      --radius-lg: 20px;
      --shadow-sm: 0 1px 3px rgba(0,0,0,0.05);
      --shadow-md: 0 10px 25px -5px rgba(15,23,42,0.05);
      --shadow-lg: 0 20px 35px -10px rgba(15,23,42,0.08);
      --transition: all 0.25s cubic-bezier(0.16, 1, 0.3, 1);
      --container-w: 1240px;
    }

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

    html {
      scroll-behavior: smooth;
      font-size: 16px;
      background-color: var(--bg-base);
    }

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

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

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

    input, select, textarea, button {
      font: inherit;
    }

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

    .section {
      padding: clamp(64px, 8vw, 112px) 0;
      position: relative;
    }

    .section-alt {
      background-color: var(--color-surface);
      border-top: 1px solid var(--color-border);
      border-bottom: 1px solid var(--color-border);
    }

    .section-dark {
      background-color: var(--color-dark-section);
      color: #94A3B8;
    }

    .section-dark .section-title,
    .section-dark .section-badge,
    .section-dark h3 {
      color: #FFFFFF;
    }

    .section-header {
      text-align: center;
      max-width: 760px;
      margin: 0 auto clamp(40px, 6vw, 64px) auto;
    }

    .section-badge {
      display: inline-block;
      font-size: 0.85rem;
      font-weight: 600;
      color: var(--color-accent);
      background: rgba(13, 148, 136, 0.1);
      padding: 4px 14px;
      border-radius: 999px;
      margin-bottom: 16px;
      letter-spacing: 0.5px;
    }

    .section-title {
      font-size: clamp(1.6rem, 3.5vw, 2.35rem);
      color: var(--text-title);
      line-height: 1.3;
      margin-bottom: 16px;
      font-weight: 700;
      letter-spacing: -0.02em;
    }

    .section-desc {
      font-size: 1.05rem;
      color: var(--text-muted);
      line-height: 1.7;
    }

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

    .btn-primary {
      background: var(--color-accent);
      color: #FFFFFF;
      box-shadow: 0 4px 14px rgba(13, 148, 136, 0.3);
    }

    .btn-primary:hover {
      background: var(--color-accent-hover);
      transform: translateY(-2px);
      box-shadow: 0 6px 20px rgba(13, 148, 136, 0.4);
    }

    .btn-secondary {
      background: transparent;
      color: var(--color-primary);
      border-color: var(--color-border);
    }

    .btn-secondary:hover {
      background: var(--color-surface);
      border-color: var(--color-accent);
      color: var(--color-accent);
      transform: translateY(-2px);
    }

    /* Header 导航 */
    .top-bar {
      background: var(--color-primary);
      color: #94A3B8;
      font-size: 0.8rem;
      padding: 8px 0;
      border-bottom: 1px solid rgba(255,255,255,0.08);
    }

    .top-bar-content {
      display: flex;
      justify-content: space-between;
      align-items: center;
    }

    .top-bar-links {
      display: flex;
      gap: 20px;
    }

    .header-nav {
      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);
    }

    .nav-container {
      display: flex;
      align-items: center;
      justify-content: space-between;
      height: 76px;
    }

    .logo-wrapper {
      display: flex;
      align-items: center;
      gap: 12px;
      font-size: 1.35rem;
      font-weight: 800;
      color: var(--color-primary);
      letter-spacing: -0.03em;
    }

    .logo-icon {
      width: 36px;
      height: 36px;
      background: var(--color-accent);
      border-radius: var(--radius-sm);
      display: flex;
      align-items: center;
      justify-content: center;
      color: #FFF;
      font-weight: bold;
    }

    .nav-menu {
      display: flex;
      align-items: center;
      gap: 32px;
      list-style: none;
    }

    .nav-link {
      font-size: 0.95rem;
      font-weight: 500;
      color: var(--text-main);
    }

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

    .nav-cta {
      display: flex;
      align-items: center;
      gap: 12px;
    }

    .mobile-toggle {
      display: none;
      background: none;
      border: none;
      font-size: 1.5rem;
      color: var(--color-primary);
      cursor: pointer;
    }

    /* Section 1: Hero */
    .hero-section {
      padding: clamp(60px, 8vw, 100px) 0 clamp(40px, 6vw, 80px) 0;
      background: radial-gradient(circle at 80% 20%, rgba(13, 148, 136, 0.08) 0%, transparent 60%);
      position: relative;
    }

    .hero-grid {
      display: grid;
      grid-template-columns: 1.15fr 0.85fr;
      gap: 56px;
      align-items: center;
    }

    .hero-title {
      font-size: clamp(2.2rem, 4.5vw, 3.4rem);
      line-height: 1.2;
      color: var(--color-primary);
      font-weight: 800;
      margin-bottom: 24px;
      letter-spacing: -0.03em;
    }

    .hero-title span {
      color: var(--color-accent);
    }

    .hero-desc {
      font-size: 1.125rem;
      color: var(--text-muted);
      line-height: 1.75;
      margin-bottom: 36px;
    }

    .hero-actions {
      display: flex;
      gap: 16px;
      flex-wrap: wrap;
      margin-bottom: 40px;
    }

    .hero-badges {
      display: flex;
      gap: 24px;
      font-size: 0.85rem;
      color: var(--text-muted);
      border-top: 1px solid var(--color-border);
      padding-top: 24px;
    }

    .hero-badges div {
      display: flex;
      align-items: center;
      gap: 8px;
    }

    .hero-card-preview {
      background: var(--color-surface);
      border: 1px solid var(--color-border);
      border-radius: var(--radius-lg);
      padding: 16px;
      box-shadow: var(--shadow-lg);
      position: relative;
    }

    .hero-img-box {
      border-radius: var(--radius-md);
      overflow: hidden;
      aspect-ratio: 16 / 10;
      background: #E2E8F0;
    }

    .hero-img-box img {
      width: 100%;
      height: 100%;
      object-fit: cover;
    }

    /* Section 2: Metrics 看板 */
    .metrics-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }

    .metric-card {
      background: var(--color-surface);
      border: 1px solid var(--color-border);
      border-radius: var(--radius-md);
      padding: 32px 24px;
      box-shadow: var(--shadow-sm);
      text-align: center;
      transition: var(--transition);
    }

    .metric-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-md);
      border-color: rgba(13, 148, 136, 0.4);
    }

    .metric-val {
      font-family: "Inter", -apple-system, sans-serif;
      font-size: clamp(2rem, 3.5vw, 2.75rem);
      font-weight: 800;
      color: var(--color-primary);
      line-height: 1.1;
      margin-bottom: 8px;
    }

    .metric-val span {
      font-size: 1.1rem;
      color: var(--color-accent);
      margin-left: 2px;
      font-weight: 600;
    }

    .metric-label {
      font-size: 0.95rem;
      font-weight: 600;
      color: var(--text-title);
      margin-bottom: 6px;
    }

    .metric-desc {
      font-size: 0.85rem;
      color: var(--text-muted);
    }

    /* Section 3: Features 矩阵 */
    .features-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }

    .feature-card {
      background: var(--color-surface);
      border: 1px solid var(--color-border);
      border-radius: var(--radius-md);
      padding: 36px 28px;
      transition: var(--transition);
      display: flex;
      flex-direction: column;
    }

    .feature-card:hover {
      transform: translateY(-4px);
      border-color: var(--color-accent);
      box-shadow: var(--shadow-md);
    }

    .feature-icon {
      width: 48px;
      height: 48px;
      background: rgba(13, 148, 136, 0.08);
      border-radius: var(--radius-sm);
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--color-accent);
      font-size: 1.3rem;
      margin-bottom: 24px;
      font-weight: bold;
    }

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

    .feature-text {
      font-size: 0.92rem;
      color: var(--text-muted);
      line-height: 1.65;
    }

    /* Section 4: Architecture 架构 */
    .arch-grid {
      display: grid;
      grid-template-columns: 1.1fr 0.9fr;
      gap: 56px;
      align-items: center;
    }

    .arch-content h2 {
      font-size: clamp(1.8rem, 3vw, 2.2rem);
      color: var(--text-title);
      margin-bottom: 20px;
      line-height: 1.3;
    }

    .arch-specs {
      list-style: none;
      margin: 28px 0;
      display: flex;
      flex-direction: column;
      gap: 16px;
    }

    .arch-specs li {
      display: flex;
      gap: 14px;
      align-items: flex-start;
    }

    .arch-bullet {
      width: 22px;
      height: 22px;
      background: var(--color-accent);
      border-radius: 50%;
      color: #FFF;
      display: flex;
      align-items: center;
      justify-content: center;
      font-size: 0.75rem;
      flex-shrink: 0;
      margin-top: 3px;
    }

    .arch-visual {
      background: var(--color-surface);
      border: 1px solid var(--color-border);
      border-radius: var(--radius-lg);
      padding: 16px;
      box-shadow: var(--shadow-md);
    }

    /* Section 5: Solutions 产品套件 */
    .solutions-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }

    .solution-card {
      background: var(--color-surface);
      border: 1px solid var(--color-border);
      border-radius: var(--radius-lg);
      padding: 40px 32px;
      display: flex;
      flex-direction: column;
      position: relative;
      transition: var(--transition);
    }

    .solution-card:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-lg);
    }

    .solution-badge {
      align-self: flex-start;
      font-size: 0.8rem;
      font-weight: 700;
      color: var(--color-accent);
      background: rgba(13, 148, 136, 0.1);
      padding: 4px 12px;
      border-radius: 4px;
      margin-bottom: 20px;
    }

    .solution-title {
      font-size: 1.35rem;
      font-weight: 700;
      color: var(--text-title);
      margin-bottom: 12px;
    }

    .solution-desc {
      font-size: 0.92rem;
      color: var(--text-muted);
      margin-bottom: 28px;
      line-height: 1.6;
    }

    .solution-list {
      list-style: none;
      margin-bottom: 36px;
      display: flex;
      flex-direction: column;
      gap: 12px;
      flex-grow: 1;
    }

    .solution-list li {
      font-size: 0.88rem;
      color: var(--text-main);
      display: flex;
      align-items: center;
      gap: 8px;
    }

    .solution-list li::before {
      content: "✓";
      color: var(--color-accent);
      font-weight: bold;
    }

    /* Section 6: Comparison 对比 */
    .compare-table-wrapper {
      background: var(--color-surface);
      border: 1px solid var(--color-border);
      border-radius: var(--radius-lg);
      overflow-x: auto;
      box-shadow: var(--shadow-sm);
    }

    .compare-table {
      width: 100%;
      border-collapse: collapse;
      text-align: left;
      font-size: 0.95rem;
    }

    .compare-table th, .compare-table td {
      padding: 22px 28px;
      border-bottom: 1px solid var(--color-border);
    }

    .compare-table th {
      background: #F8FAFC;
      color: var(--text-title);
      font-weight: 700;
    }

    .compare-table tr:last-child td {
      border-bottom: none;
    }

    .compare-table .feature-col {
      width: 25%;
      font-weight: 600;
      color: var(--color-primary);
    }

    .compare-table .our-col {
      width: 38%;
      color: var(--color-accent);
      background: rgba(13, 148, 136, 0.03);
      font-weight: 600;
    }

    .compare-table .traditional-col {
      width: 37%;
      color: var(--text-muted);
    }

    /* Section 7: Milestones 深色里程碑 */
    .timeline-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
      position: relative;
    }

    .timeline-item {
      background: rgba(255, 255, 255, 0.04);
      border: 1px solid rgba(255, 255, 255, 0.08);
      border-radius: var(--radius-md);
      padding: 32px 24px;
      position: relative;
    }

    .timeline-year {
      font-family: "Inter", sans-serif;
      font-size: 1.6rem;
      font-weight: 800;
      color: var(--color-accent);
      margin-bottom: 12px;
    }

    .timeline-title {
      font-size: 1.1rem;
      font-weight: 700;
      color: #FFF;
      margin-bottom: 10px;
    }

    .timeline-text {
      font-size: 0.88rem;
      color: #94A3B8;
      line-height: 1.6;
    }

    /* Section 8: Case Studies 客户案例 */
    .cases-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 36px;
    }

    .case-card {
      background: var(--color-surface);
      border: 1px solid var(--color-border);
      border-radius: var(--radius-lg);
      overflow: hidden;
      display: flex;
      flex-direction: column;
      box-shadow: var(--shadow-sm);
    }

    .case-img-box {
      aspect-ratio: 16 / 9;
      background: #CBD5E1;
      overflow: hidden;
    }

    .case-img-box img {
      width: 100%;
      height: 100%;
      object-fit: cover;
      transition: transform 0.4s ease;
    }

    .case-card:hover .case-img-box img {
      transform: scale(1.03);
    }

    .case-content {
      padding: 36px 32px;
      flex-grow: 1;
      display: flex;
      flex-direction: column;
    }

    .case-org {
      font-size: 0.85rem;
      font-weight: 600;
      color: var(--color-accent);
      margin-bottom: 8px;
    }

    .case-title {
      font-size: 1.25rem;
      font-weight: 700;
      color: var(--text-title);
      margin-bottom: 16px;
    }

    .case-desc {
      font-size: 0.92rem;
      color: var(--text-muted);
      line-height: 1.7;
      margin-bottom: 24px;
    }

    .case-tags {
      display: flex;
      gap: 8px;
      margin-top: auto;
      flex-wrap: wrap;
    }

    .case-tag {
      font-size: 0.78rem;
      padding: 4px 10px;
      background: var(--color-surface-soft);
      border-radius: 4px;
      color: var(--text-main);
    }

    /* Section 9: Security 安全保障 */
    .security-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 24px;
    }

    .sec-card {
      background: var(--color-surface);
      border: 1px solid var(--color-border);
      border-radius: var(--radius-md);
      padding: 32px 24px;
      text-align: center;
    }

    .sec-icon {
      width: 52px;
      height: 52px;
      margin: 0 auto 20px auto;
      background: rgba(13, 148, 136, 0.08);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      color: var(--color-accent);
      font-weight: 700;
      font-size: 1.2rem;
    }

    .sec-title {
      font-size: 1.1rem;
      font-weight: 700;
      color: var(--text-title);
      margin-bottom: 10px;
    }

    .sec-desc {
      font-size: 0.88rem;
      color: var(--text-muted);
      line-height: 1.6;
    }

    /* Section 10: Insights 资讯研究 */
    .insights-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 28px;
    }

    .insight-card {
      background: var(--color-surface);
      border: 1px solid var(--color-border);
      border-radius: var(--radius-md);
      padding: 32px 28px;
      display: flex;
      flex-direction: column;
      box-shadow: var(--shadow-sm);
    }

    .insight-date {
      font-size: 0.8rem;
      color: var(--text-muted);
      margin-bottom: 12px;
    }

    .insight-title {
      font-size: 1.15rem;
      font-weight: 700;
      color: var(--text-title);
      margin-bottom: 12px;
      line-height: 1.45;
    }

    .insight-excerpt {
      font-size: 0.9rem;
      color: var(--text-muted);
      line-height: 1.65;
      margin-bottom: 20px;
      flex-grow: 1;
    }

    .insight-link {
      font-size: 0.88rem;
      color: var(--color-accent);
      font-weight: 600;
      display: inline-flex;
      align-items: center;
      gap: 4px;
    }

    /* Section 11: FAQ 常见疑问 */
    .faq-container {
      max-width: 860px;
      margin: 0 auto;
    }

    .faq-item {
      background: var(--color-surface);
      border: 1px solid var(--color-border);
      border-radius: var(--radius-md);
      margin-bottom: 16px;
      overflow: hidden;
    }

    .faq-question {
      padding: 22px 28px;
      font-size: 1.05rem;
      font-weight: 600;
      color: var(--text-title);
      cursor: pointer;
      display: flex;
      justify-content: space-between;
      align-items: center;
      user-select: none;
    }

    .faq-question::after {
      content: "+";
      font-size: 1.3rem;
      color: var(--color-accent);
      transition: transform 0.2s ease;
    }

    .faq-item.active .faq-question::after {
      content: "-";
    }

    .faq-answer {
      padding: 0 28px 24px 28px;
      font-size: 0.95rem;
      color: var(--text-muted);
      line-height: 1.7;
      display: none;
    }

    .faq-item.active .faq-answer {
      display: block;
    }

    /* Section 12: Contact 转化预约 */
    .conversion-card {
      background: var(--color-primary);
      border-radius: var(--radius-lg);
      padding: clamp(40px, 6vw, 72px) clamp(24px, 5vw, 64px);
      color: #FFFFFF;
      box-shadow: var(--shadow-lg);
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: 56px;
      align-items: center;
    }

    .conv-info h2 {
      font-size: clamp(1.8rem, 3.2vw, 2.4rem);
      margin-bottom: 16px;
      line-height: 1.3;
    }

    .conv-info p {
      font-size: 1.05rem;
      color: #94A3B8;
      line-height: 1.7;
      margin-bottom: 32px;
    }

    .conv-meta {
      display: flex;
      flex-direction: column;
      gap: 12px;
      font-size: 0.9rem;
      color: #CBD5E1;
    }

    .conv-form {
      background: var(--color-surface);
      padding: 36px 32px;
      border-radius: var(--radius-md);
      color: var(--text-main);
    }

    .form-group {
      margin-bottom: 20px;
    }

    .form-group label {
      display: block;
      font-size: 0.88rem;
      font-weight: 600;
      color: var(--text-title);
      margin-bottom: 8px;
    }

    .form-control {
      width: 100%;
      padding: 12px 16px;
      border: 1px solid var(--color-border);
      border-radius: var(--radius-sm);
      font-size: 0.95rem;
      background: #F8FAFC;
    }

    .form-control:focus {
      outline: none;
      border-color: var(--color-accent);
      background: #FFFFFF;
    }

    .form-privacy {
      font-size: 0.78rem;
      color: var(--text-muted);
      margin-top: 14px;
      text-align: center;
    }

    /* Footer 规范 */
    .footer {
      background: #090D16;
      color: #94A3B8;
      padding: 72px 0 32px 0;
      border-top: 1px solid rgba(255,255,255,0.06);
      font-size: 0.9rem;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 1.4fr 0.9fr 0.9fr 1.2fr;
      gap: 48px;
      margin-bottom: 56px;
    }

    .footer-brand h4 {
      font-size: 1.25rem;
      font-weight: 700;
      color: #FFFFFF;
      margin-bottom: 16px;
    }

    .footer-brand p {
      line-height: 1.7;
      margin-bottom: 20px;
    }

    .footer-col h5 {
      font-size: 1rem;
      font-weight: 600;
      color: #FFFFFF;
      margin-bottom: 20px;
    }

    .footer-col ul {
      list-style: none;
      display: flex;
      flex-direction: column;
      gap: 12px;
    }

    .footer-col a:hover {
      color: var(--color-accent);
    }

    .footer-contact-list {
      display: flex;
      flex-direction: column;
      gap: 12px;
    }

    .footer-bottom {
      border-top: 1px solid rgba(255, 255, 255, 0.08);
      padding-top: 32px;
      display: flex;
      justify-content: space-between;
      align-items: center;
      flex-wrap: wrap;
      gap: 16px;
      font-size: 0.82rem;
    }

    /* 移动端与自适应断点 */
    @media (max-width: 1024px) {
      .hero-grid,
      .arch-grid,
      .conversion-card {
        grid-template-columns: 1fr;
        gap: 40px;
      }
      .metrics-grid,
      .timeline-grid,
      .security-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .features-grid,
      .solutions-grid,
      .insights-grid {
        grid-template-columns: repeat(2, 1fr);
      }
      .footer-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }

    @media (max-width: 768px) {
      .top-bar {
        display: none;
      }
      .nav-menu {
        position: fixed;
        top: 76px;
        left: 0;
        width: 100%;
        background: #FFFFFF;
        flex-direction: column;
        padding: 32px;
        box-shadow: 0 10px 20px rgba(0,0,0,0.1);
        display: none;
        gap: 20px;
        border-bottom: 1px solid var(--color-border);
      }
      .nav-menu.active {
        display: flex;
      }
      .mobile-toggle {
        display: block;
      }
      .features-grid,
      .solutions-grid,
      .insights-grid,
      .cases-grid {
        grid-template-columns: 1fr;
      }
      .metrics-grid,
      .timeline-grid,
      .security-grid {
        grid-template-columns: 1fr;
      }
      .footer-grid {
        grid-template-columns: 1fr;
        gap: 32px;
      }
      .footer-bottom {
        flex-direction: column;
        align-items: flex-start;
      }
    }