:root {
      --ink: #162033;
      --muted: #657188;
      --paper: #f7f9fc;
      --white: #ffffff;
      --line: #e4e9f1;
      --blue: #3158e8;
      --cyan: #18b9c9;
      --orange: #ff8248;
      --yellow: #ffc94a;
      --pink: #ee5c9e;
      --green: #23a878;
      --navy: #17254b;
      --shadow: 0 16px 42px rgba(31, 50, 91, .10);
      --radius: 18px;
      --container: 1180px;
    }

    * {
      box-sizing: border-box;
    }

    html {
      scroll-behavior: smooth;
    }

    body {
      margin: 0;
      color: var(--ink);
      background: var(--paper);
      font-family: "PingFang SC", "Microsoft YaHei", "Noto Sans CJK SC", Arial, sans-serif;
      line-height: 1.7;
    }

    a {
      color: inherit;
      text-decoration: none;
    }

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

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

    .container {
      width: min(var(--container), calc(100% - 40px));
      margin: 0 auto;
    }

    .site-header {
      position: sticky;
      top: 0;
      z-index: 50;
      background: rgba(255,255,255,.95);
      border-bottom: 1px solid var(--line);
      backdrop-filter: blur(14px);
    }

    .nav-bar {
      min-height: 74px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 24px;
    }

    .brand {
      display: inline-flex;
      align-items: center;
      gap: 10px;
      flex: 0 0 auto;
      font-weight: 800;
      color: var(--navy);
      letter-spacing: 0;
    }

    .brand img {
      width: 42px;
      max-height: 42px;
      object-fit: contain;
    }

    .nav-links {
      display: flex;
      align-items: center;
      justify-content: flex-end;
      gap: 0;
      flex-wrap: wrap;
    }

    .nav-links a {
      color: #485670;
      font-size: 14px;
      padding: 8px 10px;
      transition: color .2s ease, background .2s ease;
    }

    .nav-links a:hover {
      color: var(--blue);
      background: #eef2ff;
    }

    .nav-cta,
    .primary-btn,
    .secondary-btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      min-height: 46px;
      padding: 0 20px;
      border-radius: 11px;
      border: 1px solid transparent;
      font-weight: 700;
      cursor: pointer;
      transition: transform .2s ease, box-shadow .2s ease, background .2s ease;
    }

    .nav-cta,
    .primary-btn {
      color: var(--white);
      background: var(--blue);
      box-shadow: 0 9px 20px rgba(49,88,232,.22);
    }

    .secondary-btn {
      color: var(--blue);
      background: var(--white);
      border-color: #cbd5f7;
    }

    .nav-cta:hover,
    .primary-btn:hover,
    .secondary-btn:hover {
      transform: translateY(-2px);
      box-shadow: 0 12px 24px rgba(31,50,91,.16);
    }

    .menu-toggle {
      display: none;
      border: 0;
      background: #eef2ff;
      color: var(--blue);
      width: 42px;
      height: 42px;
      border-radius: 10px;
      cursor: pointer;
      font-size: 22px;
    }

    .hero {
      position: relative;
      overflow: hidden;
      background: #17254b;
      color: var(--white);
      padding: 88px 0 78px;
    }

    .hero:before,
    .hero:after {
      content: "";
      position: absolute;
      pointer-events: none;
      border: 1px solid rgba(255,255,255,.15);
      transform: rotate(18deg);
    }

    .hero:before {
      width: 280px;
      height: 280px;
      right: 8%;
      top: -120px;
      border-radius: 42px;
      background: rgba(24,185,201,.15);
    }

    .hero:after {
      width: 180px;
      height: 180px;
      right: 27%;
      bottom: -100px;
      border-radius: 50%;
      background: rgba(255,201,74,.15);
    }

    .hero-grid {
      position: relative;
      z-index: 1;
      display: grid;
      grid-template-columns: minmax(0, 1.08fr) minmax(300px, .92fr);
      gap: 56px;
      align-items: center;
    }

    .eyebrow {
      display: inline-flex;
      align-items: center;
      gap: 8px;
      color: #a9eff1;
      font-size: 14px;
      font-weight: 700;
      letter-spacing: 1px;
      margin-bottom: 16px;
    }

    .eyebrow:before {
      content: "";
      width: 28px;
      height: 3px;
      background: var(--yellow);
      border-radius: 3px;
    }

    h1,
    h2,
    h3,
    p {
      margin-top: 0;
    }

    h1 {
      max-width: 650px;
      margin-bottom: 20px;
      font-size: clamp(38px, 5vw, 66px);
      line-height: 1.12;
      letter-spacing: 0;
    }

    .hero-copy {
      max-width: 650px;
      color: #dce5ff;
      font-size: 18px;
      margin-bottom: 30px;
    }

    .hero-actions {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
    }

    .hero .primary-btn {
      background: var(--orange);
      box-shadow: 0 10px 24px rgba(255,130,72,.28);
    }

    .hero .secondary-btn {
      color: var(--white);
      background: transparent;
      border-color: rgba(255,255,255,.36);
    }

    .hero-panel {
      display: grid;
      grid-template-columns: repeat(2, minmax(0, 1fr));
      gap: 14px;
    }

    .signal {
      min-height: 140px;
      padding: 22px;
      border: 1px solid rgba(255,255,255,.18);
      border-radius: 16px;
      background: rgba(255,255,255,.09);
      animation: floatIn .7s ease both;
    }

    .signal:nth-child(2) {
      animation-delay: .1s;
    }

    .signal:nth-child(3) {
      animation-delay: .2s;
    }

    .signal:nth-child(4) {
      animation-delay: .3s;
    }

    .signal strong {
      display: block;
      font-size: 30px;
      color: var(--yellow);
      line-height: 1.2;
      margin-bottom: 7px;
    }

    .signal span {
      color: #dce5ff;
      font-size: 14px;
    }

    @keyframes floatIn {
      from { opacity: 0; transform: translateY(18px); }
      to { opacity: 1; transform: translateY(0); }
    }

    .section {
      padding: 82px 0;
    }

    .section-tint {
      background: #eef4ff;
    }

    .section-dark {
      color: var(--white);
      background: var(--navy);
    }

    .section-head {
      max-width: 720px;
      margin-bottom: 38px;
    }

    .section-head.center {
      margin-left: auto;
      margin-right: auto;
      text-align: center;
    }

    .kicker {
      color: var(--blue);
      font-size: 13px;
      font-weight: 800;
      letter-spacing: 1.6px;
      text-transform: uppercase;
      margin-bottom: 9px;
    }

    .section-dark .kicker {
      color: #a9eff1;
    }

    h2 {
      font-size: clamp(28px, 4vw, 44px);
      line-height: 1.2;
      margin-bottom: 14px;
    }

    .section-head p {
      color: var(--muted);
      margin-bottom: 0;
    }

    .section-dark .section-head p {
      color: #cbd6f4;
    }

    .intro-layout {
      display: grid;
      grid-template-columns: 1.15fr .85fr;
      gap: 42px;
      align-items: start;
    }

    .intro-layout p {
      color: var(--muted);
      font-size: 17px;
    }

    .key-list {
      display: grid;
      gap: 12px;
      margin: 0;
      padding: 0;
      list-style: none;
    }

    .key-list li {
      position: relative;
      padding: 14px 16px 14px 42px;
      background: var(--white);
      border-left: 4px solid var(--cyan);
      border-radius: 0 12px 12px 0;
      box-shadow: 0 8px 24px rgba(31,50,91,.06);
    }

    .key-list li:before {
      content: "✓";
      position: absolute;
      left: 15px;
      color: var(--green);
      font-weight: 900;
    }

    .stats {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 16px;
      margin-top: 38px;
    }

    .stat {
      padding: 24px;
      background: var(--white);
      border: 1px solid var(--line);
      border-top: 4px solid var(--orange);
      border-radius: 14px;
      box-shadow: var(--shadow);
    }

    .stat strong {
      display: block;
      color: var(--blue);
      font-size: 32px;
      line-height: 1.2;
      margin-bottom: 6px;
    }

    .stat span {
      color: var(--muted);
      font-size: 14px;
    }

    .service-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 16px;
    }

    .service-card {
      display: flex;
      flex-direction: column;
      min-height: 220px;
      padding: 24px;
      background: var(--white);
      border: 1px solid var(--line);
      border-radius: 14px;
      box-shadow: 0 10px 25px rgba(31,50,91,.06);
      transition: transform .25s ease, box-shadow .25s ease;
    }

    .service-card:hover,
    .case-card:hover,
    .review-card:hover {
      transform: translateY(-5px);
      box-shadow: var(--shadow);
    }

    .service-icon {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      width: 46px;
      height: 46px;
      margin-bottom: 18px;
      color: var(--white);
      background: var(--pink);
      border-radius: 12px 12px 12px 3px;
      font-size: 20px;
      font-weight: 800;
    }

    .service-card:nth-child(2n) .service-icon {
      background: var(--cyan);
    }

    .service-card:nth-child(3n) .service-icon {
      background: var(--orange);
    }

    .service-card h3 {
      font-size: 19px;
      margin-bottom: 9px;
    }

    .service-card p {
      color: var(--muted);
      font-size: 14px;
      margin-bottom: 0;
    }

    .workflow {
      display: grid;
      grid-template-columns: repeat(5, 1fr);
      gap: 0;
      counter-reset: flow;
    }

    .flow-item {
      position: relative;
      padding: 0 22px 0 0;
      counter-increment: flow;
    }

    .flow-item:not(:last-child):after {
      content: "";
      position: absolute;
      top: 24px;
      right: 15px;
      width: calc(100% - 58px);
      height: 2px;
      background: #b9c7f8;
      transform: translateX(50%);
    }

    .flow-number {
      position: relative;
      z-index: 1;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      width: 50px;
      height: 50px;
      margin-bottom: 16px;
      color: var(--white);
      background: var(--blue);
      border-radius: 50%;
      font-size: 18px;
      font-weight: 800;
    }

    .flow-number:before {
      content: counter(flow, decimal-leading-zero);
    }

    .flow-item h3 {
      font-size: 18px;
      margin-bottom: 7px;
    }

    .flow-item p {
      color: var(--muted);
      font-size: 14px;
      margin-bottom: 0;
    }

    .solution-layout {
      display: grid;
      grid-template-columns: .85fr 1.15fr;
      gap: 22px;
      align-items: stretch;
    }

    .solution-feature {
      padding: 32px;
      color: var(--white);
      background: #3158e8;
      border-radius: 18px;
    }

    .solution-feature h3 {
      font-size: 28px;
      margin-bottom: 14px;
    }

    .solution-feature p {
      color: #e5ebff;
    }

    .tag-list {
      display: flex;
      flex-wrap: wrap;
      gap: 9px;
      margin-top: 24px;
    }

    .tag {
      padding: 6px 11px;
      color: var(--navy);
      background: var(--yellow);
      border-radius: 20px;
      font-size: 13px;
      font-weight: 700;
    }

    .solution-list {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 12px;
    }

    .solution-item {
      padding: 20px;
      background: var(--white);
      border: 1px solid var(--line);
      border-radius: 12px;
    }

    .solution-item h3 {
      font-size: 17px;
      margin-bottom: 6px;
    }

    .solution-item p {
      color: var(--muted);
      font-size: 14px;
      margin-bottom: 0;
    }

    .network {
      display: flex;
      flex-wrap: wrap;
      gap: 10px;
      padding: 28px;
      background: var(--white);
      border: 1px solid var(--line);
      border-radius: 16px;
      box-shadow: var(--shadow);
    }

    .network span {
      padding: 8px 14px;
      color: #30415f;
      background: #f0f5ff;
      border: 1px solid #dce5fc;
      border-radius: 8px;
      font-size: 14px;
    }

    .compare-wrap {
      overflow-x: auto;
      background: var(--white);
      border: 1px solid var(--line);
      border-radius: 16px;
      box-shadow: var(--shadow);
    }

    .compare-table {
      width: 100%;
      min-width: 760px;
      border-collapse: collapse;
    }

    .compare-table th,
    .compare-table td {
      padding: 16px 18px;
      text-align: left;
      border-bottom: 1px solid var(--line);
      vertical-align: top;
    }

    .compare-table th {
      color: var(--white);
      background: var(--navy);
      font-size: 15px;
    }

    .compare-table th:last-child {
      background: var(--blue);
    }

    .compare-table td {
      color: var(--muted);
      font-size: 14px;
    }

    .compare-table td:first-child {
      color: var(--ink);
      font-weight: 700;
      background: #f8faff;
    }

    .compare-table td:last-child {
      color: var(--blue);
      font-weight: 700;
      background: #f2f5ff;
    }

    .rating-strip {
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 20px;
      margin-bottom: 22px;
      padding: 22px 26px;
      color: var(--white);
      background: var(--orange);
      border-radius: 16px;
    }

    .rating-strip strong {
      font-size: 30px;
    }

    .stars {
      color: var(--yellow);
      font-size: 25px;
      letter-spacing: 3px;
    }

    .cases {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 18px;
    }

    .case-card {
      overflow: hidden;
      background: var(--white);
      border: 1px solid var(--line);
      border-radius: 15px;
      transition: transform .25s ease, box-shadow .25s ease;
    }

    .case-image {
      aspect-ratio: 16 / 8;
      overflow: hidden;
      background: #e7edff;
    }

    .case-image img {
      width: 100%;
      height: 100%;
      object-fit: cover;
    }

    .case-content {
      padding: 20px;
    }

    .case-content h3 {
      font-size: 18px;
      margin-bottom: 8px;
    }

    .case-content p {
      color: var(--muted);
      font-size: 14px;
      margin-bottom: 0;
    }

    .reviews {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 16px;
    }

    .review-card {
      position: relative;
      padding: 24px;
      background: var(--white);
      border: 1px solid var(--line);
      border-radius: 14px;
      transition: transform .25s ease, box-shadow .25s ease;
    }

    .review-card:before {
      content: "“";
      position: absolute;
      top: 8px;
      right: 20px;
      color: #dce4ff;
      font-size: 58px;
      line-height: 1;
      font-family: Georgia, serif;
    }

    .review-card p {
      color: #43516b;
      font-size: 15px;
      margin-bottom: 18px;
    }

    .review-card strong {
      display: block;
      color: var(--navy);
      font-size: 14px;
    }

    .review-card span {
      color: var(--muted);
      font-size: 13px;
    }

    .pricing {
      display: grid;
      grid-template-columns: 1fr 1fr 1fr;
      gap: 16px;
    }

    .price-card {
      padding: 28px;
      background: var(--white);
      border: 1px solid var(--line);
      border-radius: 15px;
    }

    .price-card.featured {
      color: var(--white);
      background: var(--blue);
      border-color: var(--blue);
      transform: translateY(-8px);
      box-shadow: 0 18px 36px rgba(49,88,232,.2);
    }

    .price-card h3 {
      margin-bottom: 8px;
    }

    .price-card p {
      color: var(--muted);
      font-size: 14px;
    }

    .price-card.featured p {
      color: #dbe4ff;
    }

    .price {
      margin: 20px 0;
      color: var(--orange);
      font-size: 32px;
      font-weight: 800;
    }

    .price-card.featured .price {
      color: var(--yellow);
    }

    .article-grid {
      display: grid;
      grid-template-columns: repeat(5, 1fr);
      gap: 12px;
    }

    .article-link {
      display: block;
      min-height: 118px;
      padding: 17px;
      color: var(--navy);
      background: var(--white);
      border: 1px solid var(--line);
      border-radius: 12px;
      font-weight: 700;
      transition: border-color .2s ease, transform .2s ease;
    }

    .article-link:hover {
      border-color: var(--blue);
      transform: translateY(-3px);
    }

    .article-link small {
      display: block;
      margin-top: 10px;
      color: var(--muted);
      font-weight: 400;
      font-size: 12px;
    }

    .faq-list {
      display: grid;
      gap: 10px;
      max-width: 920px;
      margin: 0 auto;
    }

    details {
      background: var(--white);
      border: 1px solid var(--line);
      border-radius: 12px;
      overflow: hidden;
    }

    summary {
      position: relative;
      padding: 18px 50px 18px 20px;
      color: var(--navy);
      font-weight: 700;
      cursor: pointer;
      list-style: none;
    }

    summary::-webkit-details-marker {
      display: none;
    }

    summary:after {
      content: "+";
      position: absolute;
      top: 14px;
      right: 19px;
      color: var(--blue);
      font-size: 24px;
      font-weight: 400;
    }

    details[open] summary:after {
      content: "−";
    }

    details p {
      padding: 0 20px 18px;
      color: var(--muted);
      margin-bottom: 0;
      font-size: 14px;
    }

    .contact-layout {
      display: grid;
      grid-template-columns: .8fr 1.2fr;
      gap: 28px;
      align-items: start;
    }

    .contact-info {
      padding: 30px;
      color: var(--white);
      background: var(--navy);
      border-radius: 16px;
    }

    .contact-info h2 {
      font-size: 30px;
    }

    .contact-info p {
      color: #cbd6f4;
    }

    .contact-list {
      display: grid;
      gap: 10px;
      margin: 24px 0 0;
      padding: 0;
      list-style: none;
    }

    .contact-list li {
      padding: 12px 0;
      border-bottom: 1px solid rgba(255,255,255,.15);
      color: #e4eaff;
    }

    .qr-box {
      margin-top: 22px;
      width: 145px;
      padding: 10px;
      background: var(--white);
      border-radius: 10px;
    }

    .form-panel {
      padding: 30px;
      background: var(--white);
      border: 1px solid var(--line);
      border-radius: 16px;
      box-shadow: var(--shadow);
    }

    .form-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 16px;
    }

    .field {
      display: grid;
      gap: 7px;
    }

    .field.full {
      grid-column: 1 / -1;
    }

    label {
      color: var(--navy);
      font-size: 14px;
      font-weight: 700;
    }

    input,
    select,
    textarea {
      width: 100%;
      padding: 12px 13px;
      color: var(--ink);
      background: #fbfcff;
      border: 1px solid #d7dfed;
      border-radius: 9px;
      outline: 0;
      transition: border-color .2s ease, box-shadow .2s ease;
    }

    input:focus,
    select:focus,
    textarea:focus {
      border-color: var(--blue);
      box-shadow: 0 0 0 3px rgba(49,88,232,.12);
    }

    textarea {
      min-height: 130px;
      resize: vertical;
    }

    .form-submit {
      margin-top: 18px;
    }

    .join-banner {
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 20px;
      padding: 28px 32px;
      background: #fff0d8;
      border: 1px solid #ffd694;
      border-radius: 16px;
    }

    .join-banner h2 {
      font-size: 28px;
      margin-bottom: 7px;
    }

    .join-banner p {
      color: #765c35;
      margin-bottom: 0;
    }

    .site-footer {
      color: #dce5ff;
      background: #101a38;
      padding: 48px 0 24px;
    }

    .footer-grid {
      display: grid;
      grid-template-columns: 1.1fr .9fr .9fr 1fr;
      gap: 28px;
      padding-bottom: 34px;
      border-bottom: 1px solid rgba(255,255,255,.14);
    }

    .footer-brand {
      display: flex;
      align-items: center;
      gap: 10px;
      color: var(--white);
      font-weight: 800;
      margin-bottom: 14px;
    }

    .footer-brand img {
      width: 38px;
      max-height: 38px;
      object-fit: contain;
    }

    .footer-grid p,
    .footer-grid li {
      color: #aebbd8;
      font-size: 14px;
    }

    .footer-grid h3 {
      color: var(--white);
      font-size: 16px;
      margin-bottom: 13px;
    }

    .footer-links {
      display: grid;
      gap: 7px;
      margin: 0;
      padding: 0;
      list-style: none;
    }

    .footer-links a:hover {
      color: var(--yellow);
    }

    .copyright {
      display: flex;
      justify-content: space-between;
      gap: 20px;
      padding-top: 20px;
      color: #91a0c2;
      font-size: 13px;
    }

    .float-service,
    .back-top {
      position: fixed;
      right: 20px;
      z-index: 40;
      display: inline-flex;
      align-items: center;
      justify-content: center;
      border: 0;
      cursor: pointer;
      box-shadow: 0 10px 25px rgba(20,35,75,.2);
    }

    .float-service {
      bottom: 82px;
      width: 52px;
      height: 52px;
      color: var(--white);
      background: var(--orange);
      border-radius: 50%;
      font-size: 13px;
      font-weight: 800;
    }

    .back-top {
      right: 22px;
      bottom: 20px;
      width: 42px;
      height: 42px;
      color: var(--blue);
      background: var(--white);
      border: 1px solid #d8e0f1;
      border-radius: 50%;
      opacity: 0;
      pointer-events: none;
      transition: opacity .2s ease;
    }

    .back-top.show {
      opacity: 1;
      pointer-events: auto;
    }

    .reveal {
      opacity: 0;
      transform: translateY(18px);
      transition: opacity .65s ease, transform .65s ease;
    }

    .reveal.visible {
      opacity: 1;
      transform: translateY(0);
    }

    @media (max-width: 1050px) {
      .nav-links a {
        padding-left: 7px;
        padding-right: 7px;
        font-size: 13px;
      }

      .service-grid {
        grid-template-columns: repeat(3, 1fr);
      }

      .article-grid {
        grid-template-columns: repeat(3, 1fr);
      }
    }

    @media (max-width: 820px) {
      .container {
        width: min(var(--container), calc(100% - 30px));
      }

      .nav-bar {
        min-height: 66px;
      }

      .menu-toggle {
        display: block;
      }

      .nav-cta {
        display: none;
      }

      .nav-links {
        position: absolute;
        top: 66px;
        left: 0;
        right: 0;
        display: none;
        padding: 12px 15px 18px;
        background: var(--white);
        border-bottom: 1px solid var(--line);
        box-shadow: 0 15px 28px rgba(31,50,91,.12);
      }

      .nav-links.open {
        display: grid;
        grid-template-columns: repeat(2, 1fr);
      }

      .nav-links a {
        padding: 10px;
      }

      .hero {
        padding: 68px 0 58px;
      }

      .hero-grid,
      .intro-layout,
      .solution-layout,
      .contact-layout {
        grid-template-columns: 1fr;
      }

      .hero-panel {
        max-width: 560px;
      }

      .stats,
      .service-grid {
        grid-template-columns: repeat(2, 1fr);
      }

      .workflow {
        grid-template-columns: repeat(2, 1fr);
        gap: 30px 20px;
      }

      .flow-item:not(:last-child):after {
        display: none;
      }

      .cases,
      .reviews,
      .pricing {
        grid-template-columns: repeat(2, 1fr);
      }

      .price-card.featured {
        transform: none;
      }

      .footer-grid {
        grid-template-columns: repeat(2, 1fr);
      }
    }

    @media (max-width: 560px) {
      .section {
        padding: 62px 0;
      }

      h1 {
        font-size: 39px;
      }

      .hero-copy {
        font-size: 16px;
      }

      .hero-panel,
      .stats,
      .service-grid,
      .solution-list,
      .cases,
      .reviews,
      .pricing,
      .article-grid,
      .form-grid {
        grid-template-columns: 1fr;
      }

      .workflow {
        grid-template-columns: 1fr;
      }

      .rating-strip,
      .join-banner,
      .copyright {
        align-items: flex-start;
        flex-direction: column;
      }

      .form-panel,
      .contact-info {
        padding: 22px;
      }

      .footer-grid {
        grid-template-columns: 1fr;
      }

      .float-service {
        right: 15px;
      }

      .back-top {
        right: 20px;
      }
    }