:root {
      --night: #171b24;
      --night-2: #242a35;
      --paper: #fffefb;
      --paper-2: #f5f3ee;
      --ink: #20242c;
      --muted: #68707b;
      --line: #dddfe2;
      --red: #f21e36;
      --red-dark: #c91428;
      --blue: #2b91df;
      --gold: #efbd65;
      --max: 1160px;
      --shadow: 0 24px 60px rgba(20, 24, 32, 0.16);
    }

    * { box-sizing: border-box; }
    html { scroll-behavior: smooth; scroll-padding-top: 86px; }
    body {
      margin: 0;
      color: var(--ink);
      background: var(--paper);
      font-family: "Microsoft YaHei", "PingFang SC", system-ui, -apple-system, sans-serif;
      line-height: 1.65;
      letter-spacing: 0;
    }
    body.xr-menu-open { overflow: hidden; }
    a { color: inherit; text-decoration: none; }
    button, a { font: inherit; }
    button { color: inherit; }
    img { display: block; max-width: 100%; }
    a:focus-visible, button:focus-visible { outline: 3px solid rgba(242, 30, 54, 0.38); outline-offset: 3px; }
    .xr-wrap { width: min(calc(100% - 40px), var(--max)); margin: 0 auto; }

    .xr-site-header {
      position: sticky;
      top: 0;
      z-index: 50;
      height: 74px;
      border-bottom: 1px solid rgba(221, 223, 226, 0.9);
      background: rgba(255, 254, 251, 0.96);
      backdrop-filter: blur(14px);
    }
    .xr-header-inner { display: flex; align-items: center; height: 100%; gap: 34px; }
    .xr-brand { display: inline-flex; align-items: center; gap: 11px; min-width: max-content; font-size: 18px; font-weight: 900; }
    .xr-brand img { width: 43px; height: 43px; border: 1px solid var(--line); border-radius: 7px; object-fit: cover; }
    .xr-main-nav { display: flex; align-items: center; justify-content: center; gap: 26px; flex: 1; color: #545b65; font-size: 13px; font-weight: 700; }
    .xr-main-nav a { padding: 9px 0; border-bottom: 2px solid transparent; }
    .xr-main-nav a:hover { color: var(--red); border-color: var(--red); }
    .xr-header-action, .xr-button-primary, .xr-button-secondary {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      min-height: 44px;
      padding: 0 19px;
      border: 1px solid transparent;
      border-radius: 5px;
      font-weight: 900;
    }
    .xr-header-action, .xr-button-primary { color: #fff; background: var(--red); }
    .xr-button-primary:not(.xr-download-cta):hover, .xr-header-action:hover { background: var(--red-dark); }
    .xr-header-action, .xr-button-secondary { gap: 8px; }
    .xr-download-cta {
      min-height: 56px;
      gap: 12px;
      padding: 0 14px 0 24px;
      border: 1px solid var(--red);
      border-radius: 4px;
      font-size: 16px;
      box-shadow: none;
    }
    .xr-download-cta .ri-download-2-line {
      width: auto;
      height: auto;
      color: #fff;
      background: transparent;
      font-size: 19px;
    }
    .xr-button-secondary { min-height: 56px; padding: 0 24px; border-color: #5c6572; color: #fff; background: transparent; }
    .xr-button-secondary:hover { border-color: #fff; background: rgba(255,255,255,.06); }
    .xr-menu-button { display: none; width: 44px; height: 42px; padding: 0; border: 1px solid var(--line); border-radius: 5px; background: #fff; font-size: 22px; }

    .xr-hero { position: relative; overflow: hidden; color: #fff; background: var(--night); }
    .xr-hero::after { position: absolute; bottom: 0; left: 0; width: 31%; height: 8px; background: var(--gold); content: ""; }
    .xr-hero-inner { display: grid; grid-template-columns: minmax(0, 1fr) minmax(390px, .82fr); gap: 76px; align-items: center; min-height: 650px; padding: 42px 0 48px; }
    .xr-hero-copy { position: relative; z-index: 2; }
    .xr-eyebrow { display: flex; align-items: center; gap: 11px; margin-bottom: 17px; color: var(--gold); font-size: 12px; font-weight: 900; }
    .xr-eyebrow::before { width: 34px; height: 2px; background: var(--gold); content: ""; }
    .xr-hero h1 { margin: 0 0 18px; font-size: 68px; line-height: 1.05; letter-spacing: 0; }
    .xr-hero h1 span { display: block; margin-top: 13px; color: #ff6375; font-size: 23px; line-height: 1.4; }
    .xr-hero-copy > p { max-width: 560px; margin: 0; color: #bac0c9; font-size: 17px; }
    .xr-hero-actions { display: flex; flex-wrap: wrap; align-items: stretch; gap: 11px; margin-top: 29px; }
    .xr-hero-notes { display: grid; grid-template-columns: repeat(3, 1fr); margin-top: 34px; border-top: 1px solid #404651; }
    .xr-hero-notes span { padding: 14px 14px 0 0; color: #9fa7b2; font-size: 12px; }
    .xr-hero-notes b { display: block; margin-bottom: 3px; color: #fff; font-size: 17px; }

    .xr-device-stage { position: relative; display: grid; min-height: 585px; place-items: center; }
    .xr-device-stage::before { position: absolute; top: 63px; right: 0; width: 82%; height: 455px; border: 1px solid #424956; content: ""; }
    .xr-device-label { position: absolute; top: 31px; left: 0; z-index: 3; padding: 9px 13px; color: var(--night); background: var(--gold); font-size: 10px; font-weight: 900; }
    .xr-device-note { position: absolute; right: 0; bottom: 34px; z-index: 3; padding: 10px 13px; color: #fff; background: var(--red); font-size: 10px; font-weight: 900; }
    .xr-reader-device { position: relative; z-index: 2; width: 320px; height: 570px; padding: 12px; border: 2px solid #555d69; border-radius: 39px; background: #0e1117; box-shadow: 18px 18px 0 var(--red), 0 28px 60px rgba(0,0,0,.38); }
    .xr-reader-device::before { position: absolute; top: 18px; left: 50%; z-index: 4; width: 70px; height: 6px; border-radius: 4px; background: #343a44; content: ""; transform: translateX(-50%); }
    .xr-reader-screen { display: grid; grid-template-rows: 30px 50px 1fr 83px; height: 100%; overflow: hidden; border-radius: 29px; color: #2b2925; background: #f4eddd; }
    .xr-reader-status { display: flex; align-items: center; justify-content: space-between; padding: 0 18px; color: #6f6a60; font-size: 9px; font-weight: 900; }
    .xr-reader-status span { display: flex; align-items: center; gap: 7px; }
    .xr-reader-toolbar { display: grid; grid-template-columns: 32px 1fr 32px; align-items: center; padding: 0 14px; border-top: 1px solid #ded5c4; border-bottom: 1px solid #ded5c4; }
    .xr-reader-toolbar i { font-size: 18px; }
    .xr-reader-toolbar b { overflow: hidden; font-size: 12px; text-align: center; text-overflow: ellipsis; white-space: nowrap; }
    .xr-reader-page { min-height: 0; overflow: hidden; padding: 25px 25px 18px; font-family: Georgia, "Songti SC", "SimSun", serif; }
    .xr-reader-page small { color: var(--red-dark); font-family: "Microsoft YaHei", sans-serif; font-size: 9px; font-weight: 900; }
    .xr-reader-page h3 { margin: 10px 0 18px; font-size: 21px; line-height: 1.35; }
    .xr-reader-page p { margin: 0 0 13px; color: #4f4b44; font-size: 13px; line-height: 1.95; text-align: justify; }
    .xr-reader-footer { padding: 11px 18px 12px; border-top: 1px solid #ded5c4; background: #eee5d4; }
    .xr-reading-progress { display: flex; align-items: center; gap: 9px; color: #756f65; font-size: 8px; }
    .xr-reading-progress span { flex: 1; height: 3px; overflow: hidden; background: #cec5b5; }
    .xr-reading-progress span::before { display: block; width: 68%; height: 100%; background: var(--red); content: ""; }
    .xr-reader-controls { display: grid; grid-template-columns: repeat(3,1fr); margin-top: 11px; }
    .xr-reader-controls span { display: grid; justify-items: center; gap: 2px; color: #5d584f; font-size: 7px; }
    .xr-reader-controls i { font-size: 17px; }

    .xr-section { padding: 94px 0; }
    .xr-section-soft { background: var(--paper-2); }
    .xr-section-dark { color: #fff; background: var(--night); }
    .xr-section-heading { max-width: 720px; margin: 0 auto 46px; text-align: center; }
    .xr-section-heading .xr-section-label { display: block; margin-bottom: 9px; color: var(--red); font-size: 11px; font-weight: 900; }
    .xr-section-heading h2 { margin: 0; font-size: 37px; line-height: 1.25; letter-spacing: 0; }
    .xr-section-heading p { margin: 0; color: var(--muted); }
    .xr-section-dark .xr-section-heading p { color: #adb4be; }
    .xr-section-dark .xr-section-heading .xr-section-label { color: var(--gold); }

    .xr-screens { display: grid; grid-template-columns: repeat(4, 1fr); gap: 18px; align-items: start; }
    .xr-screen { position: relative; margin: 0; border: 1px solid var(--line); border-radius: 6px; background: #fff; box-shadow: 0 16px 38px rgba(24, 28, 36, 0.09); }
    .xr-screen:nth-child(even) { margin-top: 34px; }
    .xr-screen::before { position: absolute; top: 12px; left: -7px; z-index: 2; width: 14px; height: 42px; background: var(--red); content: ""; }
    .xr-screen img { width: 100%; height: 430px; border-radius: 6px 6px 0 0; object-fit: cover; object-position: top; }
    .xr-screen figcaption { display: flex; justify-content: space-between; gap: 12px; padding: 15px 16px; font-size: 12px; }
    .xr-screen figcaption b { color: var(--red); }

    #xr-features .xr-section-heading { display: block; max-width: 720px; margin: 0 auto 42px; text-align: center; }
    .xr-feature-spread { display: grid; grid-template-columns: 340px minmax(0,1fr); gap: 42px; align-items: stretch; }
    .xr-feature-manifest { display: flex; min-height: 440px; flex-direction: column; padding: 34px; color: #fff; background: var(--night); }
    .xr-manifest-index { display: flex; align-items: flex-start; justify-content: space-between; padding-bottom: 22px; border-bottom: 1px solid #414853; }
    .xr-manifest-index b { color: var(--gold); font-family: Georgia, serif; font-size: 72px; font-weight: 400; line-height: .85; }
    .xr-manifest-index span { color: #8f98a5; font-size: 9px; font-weight: 900; text-align: right; }
    .xr-feature-manifest h3 { margin: 52px 0 13px; font-size: 27px; line-height: 1.3; }
    .xr-feature-manifest > p { margin: 0; color: #b5bcc6; font-size: 13px; }
    .xr-manifest-stats { display: grid; grid-template-columns: 1fr 1fr; gap: 18px; margin-top: auto; padding-top: 22px; border-top: 1px solid #414853; }
    .xr-manifest-stats span { color: #8f98a5; font-size: 9px; }
    .xr-manifest-stats b { display: block; margin-bottom: 3px; color: #fff; font-size: 16px; }
    .xr-feature-matrix { display: grid; grid-template-columns: 1fr 1fr; border-top: 2px solid var(--ink); border-left: 1px solid var(--line); }
    .xr-feature-item { display: grid; grid-template-rows: auto auto 1fr; min-height: 220px; padding: 25px; border-right: 1px solid var(--line); border-bottom: 1px solid var(--line); background: #fff; }
    .xr-feature-item header { display: flex; align-items: center; justify-content: space-between; gap: 16px; }
    .xr-feature-item header i { display: grid; width: 40px; height: 40px; place-items: center; color: #fff; background: var(--red); font-size: 19px; }
    .xr-feature-item:nth-child(2) header i, .xr-feature-item:nth-child(5) header i { color: var(--night); background: var(--gold); }
    .xr-feature-item:nth-child(3) header i, .xr-feature-item:nth-child(6) header i { background: var(--blue); }
    .xr-feature-item header span { color: #9a9fa7; font-family: Georgia, serif; font-size: 11px; font-weight: 900; }
    .xr-feature-item h3 { margin: 25px 0 8px; font-size: 19px; }
    .xr-feature-item p { align-self: end; margin: 0; color: var(--muted); font-size: 12px; line-height: 1.8; }

    .xr-steps { position: relative; display: grid; grid-template-columns: repeat(4, 1fr); gap: 0; border-top: 1px solid #4b515d; }
    .xr-step { position: relative; min-height: 240px; padding: 32px 28px; border-right: 1px solid #4b515d; }
    .xr-step:last-child { border-right: 0; }
    .xr-step-number { display: grid; width: 48px; height: 48px; margin: -57px 0 42px; place-items: center; border: 6px solid var(--night); border-radius: 50%; color: var(--night); background: var(--gold); font-family: Georgia, serif; font-weight: 900; }
    .xr-step h3 { margin: 0 0 8px; font-size: 19px; }
    .xr-step p { margin: 0; color: #aeb5bf; font-size: 13px; }

    .xr-faq-layout { display: grid; grid-template-columns: 340px minmax(0,1fr); gap: 42px; }
    .xr-faq-aside { padding: 28px; color: #fff; background: var(--night); }
    .xr-faq-aside b { display: block; margin-bottom: 18px; color: var(--gold); font-family: Georgia, serif; font-size: 52px; line-height: 1; }
    .xr-faq-aside h3 { margin: 0 0 9px; font-size: 21px; }
    .xr-faq-aside p { margin: 0; color: #b8bec7; font-size: 13px; }
    .xr-faq-list { border: 1px solid var(--line); border-top: 2px solid var(--ink); background: #fff; }
    .xr-faq-item { padding: 0 20px; border-bottom: 1px solid var(--line); }
    .xr-faq-item:last-child { border-bottom: 0; }
    .xr-faq-question { display: grid; grid-template-columns: 52px 1fr 30px; gap: 14px; align-items: center; width: 100%; min-height: 72px; padding: 12px 4px; border: 0; background: transparent; text-align: left; cursor: pointer; }
    .xr-faq-question > span:first-child { color: var(--red); font-family: Georgia, serif; font-size: 12px; font-weight: 900; }
    .xr-faq-question strong { font-size: 16px; }
    .xr-faq-plus { display: grid; width: 28px; height: 28px; place-items: center; border: 1px solid var(--line); border-radius: 50%; font-size: 17px; font-style: normal; }
    .xr-faq-question[aria-expanded="true"] .xr-faq-plus { border-color: var(--red); background: #fff1f3; }
    .xr-faq-answer { display: grid; grid-template-rows: 0fr; transition: grid-template-rows 200ms ease; }
    .xr-faq-answer > div { overflow: hidden; }
    .xr-faq-answer p { margin: 0; padding: 0 42px 20px 70px; color: var(--muted); font-size: 14px; }
    .xr-faq-item.xr-open .xr-faq-answer { grid-template-rows: 1fr; }

    .xr-review-editorial { columns: 3; column-gap: 18px; }
    .xr-review { display: inline-block; width: 100%; margin: 0 0 18px; padding: 25px; break-inside: avoid; border: 1px solid var(--line); border-top: 5px solid var(--red); border-radius: 6px; background: #fff; }
    .xr-review:nth-child(2), .xr-review:nth-child(5) { border-top-color: var(--blue); }
    .xr-review:nth-child(3), .xr-review:nth-child(6) { border-top-color: var(--gold); }
    .xr-review-mark { color: var(--red); font-family: Georgia, serif; font-size: 48px; line-height: 0.8; }
    .xr-review blockquote { margin: 18px 0 26px; line-height: 1.85; }
    .xr-review:first-child p { margin: 18px 0 26px; font-size: 14px; line-height: 1.85; }
    .xr-review footer { display: flex; justify-content: space-between; gap: 12px; padding-top: 14px; border-top: 1px solid var(--line); }
    .xr-review footer b { font-size: 13px; }
    .xr-review footer span { color: var(--muted); font-size: 11px; }

    .xr-bottom-cta { padding: 68px 0; color: #fff; background: var(--red); }
    .xr-bottom-cta-inner { display: grid; grid-template-columns: 1fr auto; gap: 42px; align-items: center; }
    .xr-bottom-cta small { display: block; margin-bottom: 7px; font-weight: 900; }
    .xr-bottom-cta h2 { margin: 0 0 8px; font-size: 35px; line-height: 1.25; }
    .xr-bottom-cta p { margin: 0; color: #ffe2e6; }
    .xr-bottom-cta .xr-button-primary { color: var(--night); border-color: #fff; background: #fff; box-shadow: 7px 7px 0 var(--night); }
    .xr-bottom-cta .xr-download-cta .ri-download-2-line { color: var(--night); }

    .xr-site-footer { padding: 43px 0 22px; color: #aeb5bf; background: #101319; }
    .xr-footer-main { display: grid; grid-template-columns: 1.4fr 1fr; gap: 60px; padding-bottom: 30px; }
    .xr-footer-brand { display: flex; align-items: center; gap: 11px; width: max-content; color: #fff; font-size: 18px; font-weight: 900; }
    .xr-footer-brand img { width: 42px; height: 42px; border-radius: 6px; }
    .xr-footer-main p { max-width: 520px; margin: 13px 0 0; font-size: 12px; }
    .xr-footer-links { display: grid; grid-template-columns: repeat(2, 1fr); gap: 8px 22px; align-content: start; }
    .xr-footer-links a { font-size: 12px; }
    .xr-footer-links a:hover { color: #fff; }
    .xr-copyright { padding-top: 19px; border-top: 1px solid #2a3039; text-align: center; font-size: 11px; }

    @media (max-width: 980px) {
      .xr-main-nav { gap: 14px; }
      .xr-hero-inner { grid-template-columns: minmax(0,1fr) minmax(330px,.8fr); gap: 38px; }
      .xr-reader-device { width: 300px; height: 550px; }
      .xr-feature-spread { grid-template-columns: 290px minmax(0,1fr); gap: 28px; }
      .xr-feature-manifest { padding: 28px; }
      .xr-feature-item { min-height: 210px; padding: 21px; }
      .xr-faq-layout { grid-template-columns: 290px minmax(0,1fr); gap: 28px; }
      .xr-screens { grid-template-columns: repeat(2, 1fr); }
      .xr-screen img { height: 530px; }
      .xr-screen:nth-child(even) { margin-top: 0; }
    }

    @media (max-width: 760px) {
      .xr-wrap { width: min(calc(100% - 30px), var(--max)); }
      .xr-site-header { height: 66px; }
      .xr-header-inner { gap: 12px; }
      .xr-header-action { display: none; }
      .xr-menu-button { display: block; margin-left: auto; }
      .xr-main-nav { position: fixed; top: 66px; right: 0; left: 0; display: none; align-items: stretch; flex-direction: column; gap: 0; padding: 14px 15px 22px; color: var(--ink); background: #fff; box-shadow: 0 18px 35px rgba(18, 22, 29, 0.16); }
      .xr-main-nav.xr-open { display: flex; }
      .xr-main-nav a { padding: 11px; border-bottom: 1px solid var(--line); }
      .xr-hero-inner { grid-template-columns: 1fr; gap: 30px; min-height: auto; padding: 52px 0 48px; }
      .xr-hero h1 { font-size: 47px; }
      .xr-hero h1 span { font-size: 19px; }
      .xr-hero-copy > p { font-size: 15px; }
      .xr-hero-notes { display: none; }
      .xr-device-stage { min-height: 540px; }
      .xr-device-stage::before { right: 8%; width: 72%; height: 400px; }
      .xr-device-label { left: 8%; }
      .xr-device-note { right: 8%; }
      .xr-reader-device { width: 292px; height: 530px; }
      .xr-section { padding: 76px 0; }
      .xr-section-heading { margin-bottom: 38px; }
      .xr-section-heading h2 { font-size: 30px; }
      .xr-feature-spread { grid-template-columns: 1fr; gap: 18px; }
      .xr-feature-manifest { min-height: 275px; }
      .xr-feature-manifest h3 { margin-top: 34px; }
      .xr-steps { grid-template-columns: 1fr; border-top: 0; border-left: 1px solid #4b515d; }
      .xr-step { display: grid; grid-template-columns: 48px 1fr; gap: 18px; min-height: auto; padding: 0 20px 34px; border-right: 0; }
      .xr-step-number { grid-row: 1 / 3; margin: 0 0 0 -25px; }
      .xr-faq-layout { grid-template-columns: 1fr; gap: 20px; }
      .xr-faq-aside { display: none; }
      .xr-faq-item { padding: 0 14px; }
      .xr-review-editorial { columns: 2; }
      .xr-bottom-cta-inner, .xr-footer-main { grid-template-columns: 1fr; }
    }

    @media (max-width: 520px) {
      .xr-brand span { font-size: 16px; }
      .xr-hero-inner { gap: 18px; padding: 38px 0 28px; }
      .xr-hero h1 { font-size: 44px; }
      .xr-hero-actions { display: grid; grid-template-columns: 1fr 1fr; gap: 8px; margin-top: 23px; }
      .xr-hero-actions a { width: 100%; min-width: 0; padding: 0 7px; font-size: 14px; }
      .xr-download-cta { min-height: 56px; gap: 7px; }
      .xr-download-cta .ri-download-2-line { font-size: 17px; }
      .xr-device-stage { min-height: 350px; }
      .xr-device-stage::before { top: 38px; right: 2%; width: 80%; height: 270px; }
      .xr-device-label { top: 12px; left: 2%; }
      .xr-device-note { right: 2%; bottom: 0; }
      .xr-reader-device { width: 194px; height: 340px; padding: 8px; border-radius: 28px; box-shadow: 10px 10px 0 var(--red), 0 18px 36px rgba(0,0,0,.34); }
      .xr-reader-device::before { top: 12px; width: 46px; height: 4px; }
      .xr-reader-screen { grid-template-rows: 22px 37px 1fr 61px; border-radius: 20px; }
      .xr-reader-status { padding: 0 13px; font-size: 7px; }
      .xr-reader-toolbar { grid-template-columns: 26px 1fr 26px; padding: 0 10px; }
      .xr-reader-toolbar i { font-size: 14px; }
      .xr-reader-toolbar b { font-size: 9px; }
      .xr-reader-page { padding: 14px 15px 8px; }
      .xr-reader-page small { font-size: 7px; }
      .xr-reader-page h3 { margin: 6px 0 9px; font-size: 15px; }
      .xr-reader-page p { margin-bottom: 7px; font-size: 9px; line-height: 1.65; }
      .xr-reader-page p:last-child { display: none; }
      .xr-reader-footer { padding: 7px 11px; }
      .xr-reader-controls { margin-top: 6px; }
      .xr-reader-controls i { font-size: 14px; }
      .xr-screens { grid-template-columns: 1fr 1fr; gap: 10px; }
      .xr-screen img { height: 315px; }
      .xr-screen figcaption { display: block; padding: 12px; }
      .xr-screen figcaption b { display: block; margin-bottom: 3px; }
      .xr-feature-matrix { grid-template-columns: 1fr; }
      .xr-feature-item { min-height: 160px; padding: 21px; }
      .xr-feature-item h3 { margin-top: 18px; }
      .xr-review-editorial { columns: 1; }
      .xr-bottom-cta h2 { font-size: 29px; }
    }

    @media (prefers-reduced-motion: reduce) {
      html { scroll-behavior: auto; }
      *, *::before, *::after { transition-duration: 0.01ms !important; }
    }