:root {
      --ink: #10233d;
      --muted: #5e6d80;
      --blue: #1264ff;
      --cyan: #00b8d9;
      --lime: #b7ed3e;
      --yellow: #ffd84d;
      --paper: #f7fbff;
      --line: #dce7f2;
      --white: #ffffff;
      --navy: #0d1c32;
      --shadow: 0 16px 42px rgba(24, 69, 125, .11);
      --radius: 18px;
    }

    * { 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;
      overflow-x: hidden;
    }
    a { color: inherit; text-decoration: none; }
    img { max-width: 100%; height: auto; display: block; }
    button, input, select, textarea { font: inherit; }
    .container {
      width: min(1180px, calc(100% - 40px));
      margin: 0 auto;
    }
    .topbar {
      position: sticky;
      top: 0;
      z-index: 20;
      background: rgba(255,255,255,.94);
      border-bottom: 1px solid rgba(220,231,242,.9);
      backdrop-filter: blur(14px);
    }
    .nav {
      min-height: 76px;
      display: flex;
      align-items: center;
      justify-content: space-between;
      gap: 22px;
    }
    .brand {
      display: inline-flex;
      align-items: center;
      flex: 0 0 auto;
    }
    .brand img {
      width: 132px;
    }
    .nav-links {
      display: flex;
      align-items: center;
      gap: 0;
      flex-wrap: nowrap;
      justify-content: flex-end;
    }
    .nav-links a {
      color: #31435b;
      font-size: 14px;
      padding: 8px 10px;
      white-space: nowrap;
      transition: color .2s ease, transform .2s ease;
    }
    .nav-links a:hover { color: var(--blue); transform: translateY(-1px); }
    .nav-cta {
      background: var(--blue);
      color: #fff !important;
      border-radius: 10px;
      padding: 9px 14px !important;
      margin-left: 8px;
    }
    .nav-toggle {
      display: none;
      border: 0;
      background: transparent;
      color: var(--ink);
      font-size: 25px;
      cursor: pointer;
      padding: 4px;
    }

    .hero {
      position: relative;
      overflow: hidden;
      padding: 88px 0 70px;
      background:
        linear-gradient(135deg, #eaf6ff 0%, #f8fdff 50%, #f4ffe2 100%);
      border-bottom: 1px solid #d9e9f3;
    }
    .hero:before,
    .hero:after {
      content: "";
      position: absolute;
      border: 1px solid rgba(18,100,255,.13);
      transform: rotate(35deg);
      pointer-events: none;
    }
    .hero:before {
      width: 360px;
      height: 360px;
      right: -130px;
      top: -150px;
      border-radius: 46px;
    }
    .hero:after {
      width: 180px;
      height: 180px;
      left: -90px;
      bottom: -90px;
      border-radius: 28px;
    }
    .hero-grid {
      position: relative;
      z-index: 1;
      display: grid;
      grid-template-columns: minmax(0, 1.15fr) minmax(340px, .85fr);
      gap: 60px;
      align-items: center;
    }
    .eyebrow, .section-kicker {
      color: var(--blue);
      font-weight: 700;
      letter-spacing: .08em;
      font-size: 13px;
      text-transform: uppercase;
    }
    h1, h2, h3, p { margin-top: 0; }
    h1 {
      max-width: 680px;
      margin-bottom: 22px;
      color: var(--ink);
      font-size: clamp(36px, 5vw, 68px);
      line-height: 1.12;
      letter-spacing: 0;
    }
    .hero-copy {
      max-width: 670px;
      color: #43556c;
      font-size: 18px;
      margin-bottom: 30px;
    }
    .actions {
      display: flex;
      flex-wrap: wrap;
      gap: 12px;
      align-items: center;
    }
    .button {
      display: inline-flex;
      justify-content: center;
      align-items: center;
      min-height: 46px;
      padding: 0 20px;
      border-radius: 10px;
      border: 1px solid transparent;
      font-weight: 700;
      cursor: pointer;
      transition: transform .2s ease, box-shadow .2s ease, background .2s ease;
    }
    .button:hover { transform: translateY(-2px); box-shadow: 0 10px 22px rgba(18,100,255,.2); }
    .button-primary { background: var(--blue); color: #fff; }
    .button-light { background: #fff; color: var(--blue); border-color: #c9ddf5; }
    .hero-panel {
      padding: 26px;
      background: rgba(255,255,255,.72);
      border: 1px solid rgba(255,255,255,.9);
      box-shadow: var(--shadow);
      border-radius: 22px;
    }
    .hero-panel h2 { font-size: 21px; margin-bottom: 14px; }
    .workflow-line {
      display: grid;
      grid-template-columns: 36px 1fr;
      gap: 12px;
      align-items: start;
      padding: 14px 0;
      border-bottom: 1px solid #dcecf3;
    }
    .workflow-line:last-child { border-bottom: 0; }
    .workflow-number {
      display: grid;
      place-items: center;
      width: 30px;
      height: 30px;
      background: var(--lime);
      border-radius: 50%;
      color: #173044;
      font-weight: 800;
      font-size: 13px;
    }
    .workflow-line strong { display: block; font-size: 15px; }
    .workflow-line span { color: var(--muted); font-size: 13px; }

    .section { padding: 82px 0; }
    .section-alt { background: #edf7ff; }
    .section-white { background: #fff; }
    .section-head {
      max-width: 720px;
      margin-bottom: 38px;
    }
    .section-head h2 {
      margin: 8px 0 12px;
      font-size: clamp(28px, 4vw, 43px);
      line-height: 1.2;
    }
    .section-head p { color: var(--muted); margin-bottom: 0; }
    .stats {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 16px;
      margin-top: -28px;
      position: relative;
      z-index: 2;
    }
    .stat {
      background: #fff;
      border: 1px solid var(--line);
      border-top: 4px solid var(--blue);
      border-radius: 12px;
      padding: 22px;
      box-shadow: 0 10px 30px rgba(24,69,125,.08);
    }
    .stat strong { display: block; font-size: 31px; color: var(--blue); line-height: 1.2; }
    .stat span { color: var(--muted); font-size: 14px; }
    .intro-grid {
      display: grid;
      grid-template-columns: .9fr 1.1fr;
      gap: 42px;
      align-items: start;
    }
    .intro-copy { font-size: 17px; color: #42546b; }
    .feature-list {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 16px;
    }
    .feature {
      padding: 21px;
      border-left: 4px solid var(--cyan);
      background: #fff;
      border-radius: 0 12px 12px 0;
      box-shadow: 0 8px 24px rgba(24,69,125,.06);
    }
    .feature h3 { font-size: 17px; margin-bottom: 5px; }
    .feature p { color: var(--muted); font-size: 14px; margin-bottom: 0; }
    .service-grid {
      display: grid;
      grid-template-columns: repeat(4, 1fr);
      gap: 16px;
    }
    .service {
      background: #fff;
      border: 1px solid var(--line);
      padding: 22px;
      min-height: 190px;
      border-radius: var(--radius);
      transition: transform .25s ease, border-color .25s ease, box-shadow .25s ease;
    }
    .service:hover { transform: translateY(-5px); border-color: #82b8ff; box-shadow: var(--shadow); }
    .service-mark {
      width: 38px;
      height: 38px;
      display: grid;
      place-items: center;
      margin-bottom: 18px;
      background: #e3f6ff;
      color: var(--blue);
      border-radius: 10px;
      font-weight: 800;
    }
    .service h3 { font-size: 17px; margin-bottom: 7px; }
    .service p { color: var(--muted); font-size: 14px; margin-bottom: 0; }
    .process {
      display: grid;
      grid-template-columns: repeat(5, 1fr);
      gap: 0;
      position: relative;
    }
    .process:before {
      content: "";
      position: absolute;
      top: 25px;
      left: 10%;
      right: 10%;
      border-top: 2px dashed #9cc9f7;
    }
    .process-item { position: relative; text-align: center; padding: 0 14px; }
    .process-item b {
      position: relative;
      display: grid;
      place-items: center;
      width: 52px;
      height: 52px;
      margin: 0 auto 18px;
      background: var(--blue);
      color: #fff;
      border: 6px solid #d9efff;
      border-radius: 50%;
      z-index: 1;
    }
    .process-item h3 { font-size: 16px; margin-bottom: 7px; }
    .process-item p { color: var(--muted); font-size: 13px; }
    .solution-grid {
      display: grid;
      grid-template-columns: 1.15fr .85fr;
      gap: 28px;
      align-items: stretch;
    }
    .solution-main {
      background: var(--navy);
      color: #fff;
      padding: 34px;
      border-radius: 18px;
      position: relative;
      overflow: hidden;
    }
    .solution-main:after {
      content: "";
      position: absolute;
      width: 180px;
      height: 180px;
      right: -65px;
      bottom: -70px;
      border: 24px solid rgba(183,237,62,.72);
      border-radius: 50%;
    }
    .solution-main h2 { font-size: 32px; line-height: 1.25; max-width: 520px; }
    .solution-main p { color: #c4d5e8; max-width: 620px; }
    .tag-cloud { display: flex; flex-wrap: wrap; gap: 9px; margin-top: 24px; }
    .tag {
      color: #dff5ff;
      border: 1px solid #385574;
      background: #162e4e;
      border-radius: 99px;
      padding: 6px 12px;
      font-size: 13px;
    }
    .network {
      background: #fff;
      border: 1px solid var(--line);
      border-radius: 18px;
      padding: 28px;
    }
    .network h3 { margin-bottom: 13px; }
    .network p { color: var(--muted); font-size: 14px; }
    .model-list { display: flex; flex-wrap: wrap; gap: 8px; }
    .model-list span {
      padding: 6px 10px;
      font-size: 12px;
      color: #27415d;
      background: #f0f6ff;
      border: 1px solid #dae9fb;
      border-radius: 7px;
    }
    .media-grid {
      display: grid;
      grid-template-columns: 1fr 1fr 1fr;
      gap: 18px;
      align-items: start;
    }
    .media-card {
      overflow: hidden;
      border-radius: 15px;
      background: #fff;
      border: 1px solid var(--line);
      box-shadow: 0 10px 24px rgba(24,69,125,.07);
    }
    .media-card .media-image { aspect-ratio: 16 / 9; overflow: hidden; background: #eaf3fb; }
    .media-card .media-image img { width: 100%; height: 100%; object-fit: cover; }
    .media-card .media-body { padding: 18px; }
    .media-card h3 { font-size: 17px; margin-bottom: 7px; }
    .media-card p { color: var(--muted); font-size: 14px; margin-bottom: 0; }
    .comparison-wrap { overflow-x: auto; border: 1px solid var(--line); border-radius: 15px; background: #fff; }
    table { width: 100%; min-width: 750px; border-collapse: collapse; }
    th, td { padding: 17px 18px; text-align: left; border-bottom: 1px solid #e4edf5; }
    th { background: #102b4c; color: #fff; font-size: 14px; }
    td { color: #42546b; font-size: 14px; }
    td strong { color: var(--blue); }
    tr:last-child td { border-bottom: 0; }
    .rating {
      display: flex;
      align-items: center;
      gap: 18px;
      margin-bottom: 22px;
      padding: 22px;
      color: #24405e;
      background: linear-gradient(100deg, #fff8d6, #ffffff);
      border: 1px solid #f1df96;
      border-radius: 14px;
    }
    .rating strong { font-size: 34px; color: #f29c16; line-height: 1; }
    .stars { color: #f5ad1b; letter-spacing: 3px; font-size: 22px; }
    .review-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 17px;
    }
    .review {
      background: #fff;
      padding: 23px;
      border: 1px solid var(--line);
      border-radius: 14px;
    }
    .review p { color: #43556b; font-size: 14px; margin-bottom: 17px; }
    .review cite { color: var(--ink); font-style: normal; font-weight: 700; font-size: 13px; }
    .review small { color: var(--muted); display: block; }
    .article-grid {
      display: grid;
      grid-template-columns: repeat(3, 1fr);
      gap: 17px;
    }
    .article {
      background: #fff;
      border: 1px solid var(--line);
      padding: 22px;
      border-radius: 14px;
      transition: transform .2s ease, box-shadow .2s ease;
    }
    .article:hover { transform: translateY(-4px); box-shadow: var(--shadow); }
    .article time { color: var(--blue); font-size: 12px; font-weight: 700; }
    .article h3 { font-size: 17px; margin: 8px 0; }
    .article p { color: var(--muted); font-size: 14px; margin-bottom: 0; }
    .faq-list { max-width: 920px; }
    details {
      background: #fff;
      border: 1px solid var(--line);
      border-radius: 10px;
      margin-bottom: 11px;
      overflow: hidden;
    }
    summary {
      cursor: pointer;
      list-style: none;
      padding: 17px 20px;
      font-weight: 700;
      position: relative;
      padding-right: 50px;
    }
    summary::-webkit-details-marker { display: none; }
    summary:after {
      content: "+";
      position: absolute;
      right: 20px;
      top: 13px;
      font-size: 23px;
      color: var(--blue);
      font-weight: 400;
    }
    details[open] summary:after { content: "−"; }
    details p { padding: 0 20px 18px; margin-bottom: 0; color: var(--muted); font-size: 14px; }
    .contact-grid {
      display: grid;
      grid-template-columns: .78fr 1.22fr;
      gap: 28px;
      align-items: start;
    }
    .contact-panel {
      background: var(--navy);
      color: #fff;
      border-radius: 18px;
      padding: 32px;
    }
    .contact-panel p { color: #c8d7e8; }
    .contact-row {
      display: flex;
      gap: 12px;
      align-items: start;
      margin-top: 20px;
      color: #e8f2ff;
    }
    .contact-row b { color: var(--lime); min-width: 62px; }
    .form-panel {
      background: #fff;
      border: 1px solid var(--line);
      border-radius: 18px;
      padding: 30px;
    }
    .form-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
    .field { display: flex; flex-direction: column; gap: 6px; }
    .field-full { grid-column: 1 / -1; }
    label { color: #2d4662; font-size: 13px; font-weight: 700; }
    input, select, textarea {
      width: 100%;
      border: 1px solid #cbdbea;
      border-radius: 8px;
      padding: 12px 13px;
      color: var(--ink);
      background: #fbfdff;
      outline: none;
      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(18,100,255,.1); }
    textarea { resize: vertical; min-height: 125px; }
    .form-note { color: var(--muted); font-size: 12px; margin: 13px 0 0; }
    .footer {
      color: #d4e0ec;
      background: var(--navy);
      padding: 46px 0 22px;
    }
    .footer-grid {
      display: grid;
      grid-template-columns: 1.2fr .8fr .9fr;
      gap: 35px;
      padding-bottom: 34px;
      border-bottom: 1px solid #29415e;
    }
    .footer h2, .footer h3 { color: #fff; }
    .footer h2 { font-size: 22px; margin-bottom: 10px; }
    .footer h3 { font-size: 15px; margin-bottom: 10px; }
    .footer p { color: #aebfd2; font-size: 13px; margin-bottom: 0; }
    .footer-links { display: flex; flex-wrap: wrap; gap: 8px 14px; }
    .footer-links a { color: #d4e0ec; font-size: 13px; }
    .footer-links a:hover { color: var(--lime); }
    .copyright { padding-top: 18px; color: #9db0c5; font-size: 12px; }
    .wechat-float {
      position: fixed;
      right: 20px;
      bottom: 22px;
      z-index: 15;
      width: 58px;
      height: 58px;
      display: grid;
      place-items: center;
      color: #173044;
      background: var(--lime);
      border-radius: 50%;
      box-shadow: 0 10px 24px rgba(22,66,79,.23);
      font-weight: 800;
      font-size: 13px;
      cursor: pointer;
    }
    .wechat-float img {
      display: none;
      position: absolute;
      right: 0;
      bottom: 70px;
      width: 150px;
      padding: 8px;
      background: #fff;
      border-radius: 10px;
      box-shadow: var(--shadow);
    }
    .wechat-float:hover img { display: block; }
    .back-top {
      position: fixed;
      right: 24px;
      bottom: 92px;
      width: 34px;
      height: 34px;
      border: 1px solid #b9cfe4;
      border-radius: 50%;
      color: var(--blue);
      background: #fff;
      cursor: pointer;
      opacity: 0;
      pointer-events: none;
      transition: opacity .2s ease;
    }
    .back-top.visible { opacity: 1; pointer-events: auto; }
    .reveal { opacity: 0; transform: translateY(18px); transition: opacity .65s ease, transform .65s ease; }
    .reveal.show { opacity: 1; transform: translateY(0); }

    @media (max-width: 1020px) {
      .nav-links a { padding-left: 7px; padding-right: 7px; font-size: 13px; }
      .hero-grid, .intro-grid, .solution-grid, .contact-grid { grid-template-columns: 1fr; gap: 28px; }
      .service-grid { grid-template-columns: repeat(2, 1fr); }
      .stats { grid-template-columns: repeat(2, 1fr); }
    }
    @media (max-width: 760px) {
      .container { width: min(100% - 28px, 1180px); }
      .nav { min-height: 66px; }
      .nav-toggle { display: block; }
      .nav-links {
        display: none;
        position: absolute;
        left: 14px;
        right: 14px;
        top: 66px;
        padding: 10px;
        background: #fff;
        border: 1px solid var(--line);
        box-shadow: var(--shadow);
        border-radius: 12px;
        flex-direction: column;
        align-items: stretch;
      }
      .nav-links.open { display: flex; }
      .nav-links a { padding: 10px 12px; }
      .nav-cta { margin-left: 0; text-align: center; }
      .hero { padding: 62px 0 52px; }
      h1 { font-size: 42px; }
      .hero-copy { font-size: 16px; }
      .stats, .feature-list, .service-grid, .review-grid, .article-grid, .media-grid { grid-template-columns: 1fr; }
      .section { padding: 62px 0; }
      .process { grid-template-columns: 1fr; gap: 20px; }
      .process:before { left: 26px; top: 25px; bottom: 25px; right: auto; border-top: 0; border-left: 2px dashed #9cc9f7; }
      .process-item { display: grid; grid-template-columns: 52px 1fr; gap: 15px; text-align: left; align-items: start; padding: 0; }
      .process-item b { margin: 0; }
      .process-item h3 { margin-bottom: 3px; }
      .process-item p { grid-column: 2; margin-top: -16px; }
      .form-grid { grid-template-columns: 1fr; }
      .field-full { grid-column: auto; }
      .footer-grid { grid-template-columns: 1fr; gap: 22px; }
      .rating { align-items: flex-start; flex-direction: column; gap: 8px; }
    }