:root {
      color-scheme: light;
      --ink: #172438;
      --muted: #5d6c7e;
      --line: #dce4ec;
      --paper: #f7f9fc;
      --white: #fff;
      --blue: #245eea;
      --cyan: #08a7b5;
      --lime: #c8ef55;
      --coral: #f27c5b;
      --navy: #172d49;
      --container: 1160px;
    }
    * { box-sizing: border-box; }
    html { scroll-behavior: smooth; }
    body {
      margin: 0;
      color: var(--ink);
      background: var(--paper);
      font-family: "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
      line-height: 1.65;
    }
    a { color: inherit; text-decoration: none; }
    button, input, select, textarea { font: inherit; }
    img { max-width: 100%; height: auto; }
    .container { width: min(var(--container), calc(100% - 40px)); margin-inline: auto; }
    .site-header {
      position: sticky;
      top: 0;
      z-index: 20;
      background: rgba(255,255,255,.94);
      border-bottom: 1px solid rgba(220,228,236,.9);
      backdrop-filter: blur(12px);
    }
    .nav-row { 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; }
    .brand img { width: 132px; max-height: 46px; object-fit: contain; }
    .nav-links { display: flex; align-items: center; justify-content: flex-end; gap: 0; flex-wrap: wrap; }
    .nav-links a { padding: 10px 12px; color: #46566a; font-size: 13px; transition: color .2s ease; }
    .nav-links a:hover { color: var(--blue); }
    .nav-cta, .button {
      display: inline-flex;
      min-height: 44px;
      align-items: center;
      justify-content: center;
      gap: 8px;
      padding: 10px 18px;
      border: 1px solid transparent;
      border-radius: 6px;
      background: var(--blue);
      color: #fff;
      font-weight: 700;
      transition: transform .2s ease, box-shadow .2s ease, background .2s ease;
    }
    .nav-cta:hover, .button:hover { transform: translateY(-2px); box-shadow: 0 9px 22px rgba(36,94,234,.2); }
    .button.secondary { color: var(--ink); background: #fff; border-color: var(--line); }
    .menu-toggle { display: none; width: 42px; height: 42px; border: 1px solid var(--line); border-radius: 6px; background: #fff; color: var(--ink); }
    .hero {
      position: relative;
      overflow: hidden;
      padding: 74px 0 54px;
      background: linear-gradient(118deg, #eff5ff 0%, #f6fbff 50%, #effcf7 100%);
      border-bottom: 1px solid #dce8f1;
    }
    .hero::before {
      position: absolute;
      inset: 0;
      content: "";
      pointer-events: none;
      background-image: linear-gradient(rgba(36,94,234,.045) 1px, transparent 1px), linear-gradient(90deg, rgba(36,94,234,.045) 1px, transparent 1px);
      background-size: 42px 42px;
      mask-image: linear-gradient(to bottom, black, transparent 88%);
    }
    .hero-inner { position: relative; display: grid; grid-template-columns: minmax(0,1.2fr) minmax(290px,.8fr); align-items: center; gap: 48px; }
    .eyebrow { display: inline-flex; align-items: center; gap: 9px; color: #2257c9; font-size: 13px; font-weight: 800; }
    .eyebrow::before { width: 20px; height: 3px; content: ""; background: var(--coral); }
    h1 { max-width: 700px; margin: 14px 0 16px; font-size: clamp(38px, 5vw, 64px); line-height: 1.1; }
    .hero-copy { max-width: 650px; margin: 0; color: #4f6074; font-size: 17px; }
    .hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 28px; }
    .hero-note { margin-top: 18px; color: #617286; font-size: 13px; }
    .hero-console { position: relative; padding: 20px; border: 1px solid #d6e1ec; border-radius: 10px; background: rgba(255,255,255,.88); box-shadow: 0 18px 45px rgba(36,65,104,.1); animation: rise-in .65s ease both; }
    .console-top { display: flex; align-items: center; justify-content: space-between; gap: 12px; padding-bottom: 14px; border-bottom: 1px solid var(--line); }
    .console-title { font-size: 14px; font-weight: 800; }
    .live-label { color: #18766a; font-size: 12px; font-weight: 700; }
    .live-label::before { display: inline-block; width: 7px; height: 7px; margin-right: 7px; border-radius: 50%; background: #42bf8c; content: ""; }
    .model-grid { display: grid; grid-template-columns: repeat(3,1fr); gap: 9px; margin-top: 15px; }
    .model-chip { padding: 10px 8px; border: 1px solid #e2e8ef; border-radius: 5px; background: #f9fbfd; color: #35465a; font-size: 12px; text-align: center; }
    .console-foot { display: flex; justify-content: space-between; gap: 12px; margin-top: 16px; color: var(--muted); font-size: 12px; }
    .hero-hint { margin-top: 38px; color: #64758a; font-size: 12px; }
    .hero-hint span { display: inline-block; width: 34px; height: 1px; margin: 0 8px 4px 0; background: var(--cyan); }
    .metrics { position: relative; display: grid; grid-template-columns: repeat(4,1fr); gap: 0; margin-top: 34px; border: 1px solid #dbe4ed; border-radius: 8px; background: rgba(255,255,255,.85); }
    .metric { padding: 16px 20px; }
    .metric + .metric { border-left: 1px solid #dbe4ed; }
    .metric strong { display: block; color: #1e4fc0; font-size: 20px; }
    .metric span { color: var(--muted); font-size: 12px; }
    section { scroll-margin-top: 88px; }
    .section { padding: 76px 0; }
    .section.tint { background: #eef3f8; border-block: 1px solid #e1e8ef; }
    .section.dark { color: #f4f7fb; background: var(--navy); }
    .section-head { display: flex; align-items: end; justify-content: space-between; gap: 28px; margin-bottom: 30px; }
    .section-head h2 { margin: 0; font-size: 31px; line-height: 1.2; }
    .section-head p { max-width: 520px; margin: 0; color: var(--muted); }
    .dark .section-head p { color: #bfccda; }
    .kicker { margin-bottom: 9px; color: #147d89; font-size: 12px; font-weight: 800; }
    .intro-grid { display: grid; grid-template-columns: 1.05fr .95fr; gap: 50px; align-items: start; }
    .intro-copy { max-width: 650px; color: #526277; }
    .intro-copy p { margin: 0 0 14px; }
    .capability-list { display: grid; grid-template-columns: repeat(2,1fr); gap: 0 22px; border-top: 1px solid var(--line); }
    .capability { padding: 13px 0; border-bottom: 1px solid var(--line); }
    .capability strong { display: block; font-size: 14px; }
    .capability span { color: var(--muted); font-size: 12px; }
    .service-grid { display: grid; grid-template-columns: repeat(4,1fr); gap: 12px; }
    .service-item { min-height: 150px; padding: 18px; border: 1px solid #dfe6ee; border-radius: 6px; background: #fff; transition: transform .2s ease, box-shadow .2s ease, border-color .2s ease; }
    .service-item:hover { transform: translateY(-4px); border-color: #b4c9f7; box-shadow: 0 12px 25px rgba(31,57,91,.08); }
    .service-item h3 { margin: 0 0 8px; font-size: 16px; }
    .service-item p { margin: 0; color: var(--muted); font-size: 13px; }
    .service-index { margin-bottom: 12px; color: #098999; font-size: 11px; font-weight: 800; }
    .workflow { display: grid; grid-template-columns: repeat(4,1fr); gap: 0; counter-reset: flow; }
    .flow-step { position: relative; padding: 18px 24px 18px 0; border-top: 2px solid #9cb4d2; counter-increment: flow; }
    .flow-step::before { display: block; margin-bottom: 15px; color: #245eea; content: "0" counter(flow); font-size: 14px; font-weight: 800; }
    .flow-step h3 { margin: 0 0 7px; font-size: 16px; }
    .flow-step p { margin: 0; color: var(--muted); font-size: 13px; }
    .solution-band { display: grid; grid-template-columns: .75fr 1.25fr; gap: 42px; align-items: start; }
    .solution-band h2 { margin: 0; font-size: 29px; }
    .solution-band p { color: #c6d3e1; }
    .solution-tags { display: flex; flex-wrap: wrap; gap: 9px; }
    .solution-tags span { padding: 8px 11px; border: 1px solid #526782; border-radius: 4px; color: #f3f7fb; font-size: 13px; }
    .image-pair { display: grid; grid-template-columns: 1.15fr .85fr; gap: 16px; align-items: start; }
    .image-frame { overflow: hidden; border: 1px solid #dce4ec; border-radius: 6px; background: #e8edf3; }
    .image-frame img { display: block; width: 100%; height: auto; }
    .image-frame figcaption { padding: 11px 13px; color: #435469; background: #fff; font-size: 13px; }
    .comparison-layout { display: grid; grid-template-columns: 250px minmax(0,1fr); gap: 28px; align-items: start; }
    .score-panel { padding: 22px; border-radius: 8px; color: #1c2a3b; background: var(--lime); }
    .score-panel .stars { color: #9b4f00; font-size: 20px; letter-spacing: 0; }
    .score-panel strong { display: block; margin: 6px 0; font-size: 44px; line-height: 1; }
    .score-panel p { margin: 0; font-size: 13px; }
    .table-wrap { overflow-x: auto; border: 1px solid #dce4ec; border-radius: 6px; background: #fff; }
    table { width: 100%; border-collapse: collapse; min-width: 660px; }
    th, td { padding: 13px 14px; border-bottom: 1px solid #e5eaf0; text-align: left; font-size: 13px; vertical-align: top; }
    th { color: #34475e; background: #f2f6fa; font-size: 12px; }
    td:first-child { width: 24%; font-weight: 700; }
    tr:last-child td { border-bottom: 0; }
    .check { color: #087968; font-weight: 800; }
    .reviews { display: grid; grid-template-columns: repeat(3,1fr); gap: 12px; }
    .review { padding: 19px; border-top: 3px solid var(--cyan); background: #fff; }
    .review p { margin: 0 0 18px; color: #46576b; font-size: 14px; }
    .review strong { display: block; font-size: 13px; }
    .review span { color: var(--muted); font-size: 12px; }
    .article-grid { display: grid; grid-template-columns: repeat(3,1fr); gap: 14px; }
    .article-link { display: flex; min-height: 96px; align-items: center; justify-content: space-between; gap: 16px; padding: 17px; border: 1px solid var(--line); background: #fff; }
    .article-link span { font-weight: 700; }
    .article-link b { color: var(--blue); font-size: 20px; }
    .faq-list { border-top: 1px solid #cfd9e4; }
    details { border-bottom: 1px solid #cfd9e4; }
    summary { position: relative; padding: 17px 34px 17px 0; cursor: pointer; list-style: none; font-weight: 700; }
    summary::-webkit-details-marker { display: none; }
    summary::after { position: absolute; right: 2px; content: "+"; color: var(--blue); font-size: 20px; }
    details[open] summary::after { content: "−"; }
    details p { max-width: 850px; margin: -3px 0 17px; color: var(--muted); font-size: 14px; }
    .contact-grid { display: grid; grid-template-columns: .75fr 1.25fr; gap: 44px; align-items: start; }
    .contact-details { display: grid; gap: 15px; }
    .contact-line { padding-bottom: 13px; border-bottom: 1px solid #dbe3eb; }
    .contact-line strong { display: block; font-size: 13px; }
    .contact-line a, .contact-line span { color: var(--muted); font-size: 14px; overflow-wrap: anywhere; }
    .qr { width: 146px; margin-top: 4px; border: 1px solid var(--line); background: #fff; padding: 6px; }
    .qr img { display: block; width: 100%; }
    form { display: grid; grid-template-columns: repeat(2,minmax(0,1fr)); gap: 14px; }
    .field { display: grid; gap: 6px; }
    .field.full { grid-column: 1 / -1; }
    label { color: #34455a; font-size: 13px; font-weight: 700; }
    input, select, textarea { width: 100%; min-width: 0; padding: 11px 12px; border: 1px solid #cfd9e3; border-radius: 4px; background: #fff; color: var(--ink); }
    input:focus, select:focus, textarea:focus { outline: 2px solid rgba(36,94,234,.18); border-color: var(--blue); }
    textarea { min-height: 120px; resize: vertical; }
    form .button { justify-self: start; cursor: pointer; }
    .footer { padding: 30px 0 24px; color: #35465a; background: #e8eef4; border-top: 1px solid #d6e0e8; }
    .footer-top { display: flex; justify-content: space-between; align-items: start; gap: 28px; }
    .footer-brand { font-weight: 800; }
    .footer small { display: block; margin-top: 8px; color: #617286; }
    .friend-links { display: flex; max-width: 640px; flex-wrap: wrap; justify-content: flex-end; gap: 8px 16px; }
    .friend-links a { color: #3d5874; font-size: 12px; }
    .footer-bottom { margin-top: 22px; padding-top: 14px; border-top: 1px solid #d2dce5; color: #637286; font-size: 12px; }
    .floating { position: fixed; right: 18px; bottom: 22px; z-index: 15; display: grid; gap: 8px; }
    .floating a { display: grid; width: 48px; height: 48px; place-items: center; border: 1px solid #cbd7e2; border-radius: 50%; background: #fff; color: var(--blue); box-shadow: 0 5px 18px rgba(25,43,68,.12); font-weight: 800; }
    .reveal { opacity: 0; transform: translateY(14px); transition: opacity .55s ease, transform .55s ease; }
    .reveal.visible { opacity: 1; transform: translateY(0); }
    @keyframes rise-in { from { opacity: 0; transform: translateY(10px); } to { opacity: 1; transform: translateY(0); } }
    @media (max-width: 960px) {
      .nav-links { gap: 0; }
      .nav-links a { padding-inline: 8px; font-size: 12px; }
      .nav-cta { padding-inline: 13px; font-size: 13px; }
      .hero-inner { gap: 25px; }
      .service-grid { grid-template-columns: repeat(3,1fr); }
      .comparison-layout { grid-template-columns: 210px minmax(0,1fr); }
    }
    @media (max-width: 760px) {
      .container { width: min(var(--container), calc(100% - 32px)); }
      .nav-row { min-height: 66px; }
      .brand img { width: 116px; }
      .menu-toggle { display: inline-grid; place-items: center; }
      .nav-tools { display: flex; align-items: center; gap: 9px; }
      .nav-cta { min-height: 40px; padding: 8px 12px; }
      .nav-links { position: absolute; top: 65px; left: 0; right: 0; display: none; align-items: stretch; padding: 8px 16px 14px; border-bottom: 1px solid var(--line); background: #fff; }
      .nav-links.open { display: grid; grid-template-columns: repeat(2,1fr); }
      .nav-links a { padding: 11px 8px; border-bottom: 1px solid #edf0f4; font-size: 14px; }
      .hero { padding: 54px 0 36px; }
      .hero-inner, .intro-grid, .solution-band, .contact-grid { grid-template-columns: 1fr; }
      .hero-inner { gap: 28px; }
      h1 { font-size: 42px; }
      .hero-copy { font-size: 15px; }
      .hero-hint { margin-top: 25px; }
      .metrics { grid-template-columns: repeat(2,1fr); }
      .metric:nth-child(3) { border-left: 0; border-top: 1px solid #dbe4ed; }
      .metric:nth-child(4) { border-top: 1px solid #dbe4ed; }
      .section { padding: 56px 0; }
      .section-head { display: block; }
      .section-head h2 { margin-bottom: 12px; font-size: 27px; }
      .service-grid { grid-template-columns: repeat(2,1fr); }
      .workflow { grid-template-columns: repeat(2,1fr); gap: 12px 18px; }
      .comparison-layout { grid-template-columns: 1fr; }
      .score-panel { display: flex; align-items: center; gap: 16px; }
      .score-panel strong { font-size: 38px; }
      .reviews { grid-template-columns: repeat(2,1fr); }
      .article-grid { grid-template-columns: 1fr; }
      .image-pair { grid-template-columns: 1fr; }
      .footer-top { display: grid; }
      .friend-links { justify-content: flex-start; }
    }
    @media (max-width: 460px) {
      .hero-actions { display: grid; grid-template-columns: 1fr; }
      .hero-actions .button { width: 100%; }
      .model-grid { grid-template-columns: repeat(2,1fr); }
      .service-grid, .reviews, .capability-list { grid-template-columns: 1fr; }
      .service-item { min-height: auto; }
      .workflow { grid-template-columns: 1fr 1fr; }
      form { grid-template-columns: 1fr; }
      .field.full { grid-column: auto; }
      .score-panel { align-items: flex-start; flex-direction: column; gap: 4px; }
      .floating { right: 10px; bottom: 12px; }
      .floating a { width: 44px; height: 44px; }
    }
    @media (prefers-reduced-motion: reduce) {
      *, *::before, *::after { scroll-behavior: auto !important; animation-duration: .01ms !important; transition-duration: .01ms !important; }
      .reveal { opacity: 1; transform: none; }
    }