:root {
  color-scheme: light dark;
  --bg: #f8f9fc;
  --surface: #ffffff;
  --ink: #202b3b;
  --muted: #637083;
  --line: #dde3eb;
  --accent: #386fbf;
  --accent-hover: #2b5da8;
  --soft-blue: #edf3fc;
  --section-bg: #eef2f7;
  --header: rgba(248,249,252,.94);
  --reader-bg: #30353f;
  --button-ink: #ffffff;
  --shadow: 0 28px 90px -42px rgba(25,43,70,.35), 0 2px 12px rgba(25,43,70,.08);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif;
  font-synthesis: none;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #13171e;
    --surface: #1b222c;
    --ink: #ecebe9;
    --muted: #adb8c8;
    --line: #303b49;
    --accent: #9fc3f7;
    --accent-hover: #bdd7fd;
    --soft-blue: #202e43;
    --section-bg: #191f29;
    --header: rgba(19,23,30,.94);
    --reader-bg: #20252e;
    --button-ink: #17273f;
    --shadow: 0 30px 90px -35px rgba(0,0,0,.65), 0 0 0 1px #303b49;
  }
}
* { box-sizing: border-box; }
html { scroll-padding-top: 104px; }
@media (prefers-reduced-motion: no-preference) { html { scroll-behavior: smooth; } }
body { margin: 0; color: var(--ink); background: var(--bg); font-size: 16px; line-height: 1.65; }
button, input { font: inherit; }
a { color: inherit; text-decoration: none; }
button { cursor: pointer; color: inherit; }
button, a { -webkit-tap-highlight-color: transparent; }
button { border: 0; }
img, svg { vertical-align: middle; }
img { max-width: 100%; }
button:focus-visible, a:focus-visible, summary:focus-visible { outline: 3px solid var(--accent); outline-offset: 5px; }
[hidden] { display: none !important; }
html[data-language="en"] [data-lang="zh"], html[data-language="zh"] [data-lang="en"] { display: none !important; }
h1,h2,h3,p { margin: 0; }
h1,h2,h3 { font-weight: 600; }
.icon { width: 22px; height: 22px; flex-shrink: 0; }
.section-wrap { width: min(1160px, calc(100% - 80px)); margin-inline: auto; }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0,0,0,0); white-space: nowrap; border: 0; }
.skip-link { position: fixed; left: 20px; top: -100px; padding: 12px 20px; background: var(--surface); z-index: 100; border: 1px solid var(--line); border-radius: 8px; }
.skip-link:focus { top: 12px; }
.site-header { position: sticky; top: 0; z-index: 20; border-bottom: 1px solid var(--line); background: var(--header); backdrop-filter: blur(14px); }
.nav-wrap { width: min(1280px, calc(100% - 64px)); min-height: 80px; margin-inline: auto; display: flex; align-items: center; gap: 36px; }
.brand { display: inline-flex; align-items: center; gap: 11px; flex-shrink: 0; font-size: 20px; font-weight: 600; line-height: 1; }
.brand img { border-radius: 8px; }
.main-nav { display: flex; margin-left: auto; align-items: center; gap: 28px; color: var(--muted); font-size: 14px; }
.main-nav a:hover, .site-footer a:hover, .source-link:hover { color: var(--accent); }
.nav-actions { display: flex; align-items: center; gap: 22px; }
.language-button { background: transparent; padding: 8px 0; font-size: 14px; white-space: nowrap; }
.language-button:hover { color: var(--accent); }
.button { display: inline-flex; align-items: center; justify-content: center; gap: 10px; padding: 14px 24px; border-radius: 9px; background: var(--accent); color: var(--button-ink); font-size: 15px; font-weight: 600; line-height: 1.4; white-space: nowrap; }
.button:hover { background: var(--accent-hover); }
.button-small { padding: 11px 16px; font-size: 14px; }
.button .icon { width: 20px; height: 20px; }
.hero { padding-top: 72px; }
.hero-intro { display: grid; grid-template-columns: 1fr 1fr; align-items: start; gap: 72px; margin-bottom: 46px; }
.eyebrow { display: flex; align-items: center; gap: 8px; font-size: 12px; font-weight: 600; line-height: 1.5; letter-spacing: .08em; color: var(--accent); }
.eyebrow .icon { width: 16px; height: 16px; }
.hero h1 { margin-top: 18px; font-size: clamp(52px,5.8vw,78px); line-height: 1.08; font-weight: 600; }
.accent-word { color: var(--accent); }
.hero-summary > p:first-child { max-width: 440px; color: var(--muted); font-size: 18px; line-height: 1.75; }
.hero-actions { display: flex; align-items: center; flex-wrap: wrap; gap: 20px; margin-top: 24px; }
.text-link { display: inline-flex; align-items: center; gap: 8px; color: var(--accent); font-size: 15px; font-weight: 500; }
.text-link .icon { width: 18px; height: 18px; }
.text-link:hover .icon { transform: translateX(3px); }
.hero-note { color: var(--muted); margin-top: 16px; font-size: 13px; }
.reader-stage { padding: 26px 44px 0; background: var(--soft-blue); border: 1px solid var(--line); border-radius: 20px; overflow: hidden; scroll-margin-top: 110px; }
.reader-window { background: var(--reader-bg); border: 1px solid #424b59; border-bottom: 0; border-radius: 12px 12px 0 0; box-shadow: var(--shadow); color: #ecebe9; overflow: hidden; }
.reader-toolbar { height: 55px; display: flex; gap: 16px; align-items: center; padding: 0 20px; background: #232932; border-bottom: 1px solid #454d5b; font-size: 12px; }
.reader-identity { display: flex; align-items: center; gap: 8px; flex: 1; font-size: 13px; font-weight: 500; }
.reader-identity img { border-radius: 5px; }
.reader-tools { display: flex; align-items: center; gap: 15px; }
.reader-tools .icon { width: 18px; height: 18px; }
.toolbar-divider { height: 18px; width: 1px; background: #4d5563; }
.page-count { white-space: nowrap; }
.page-count > span { color: #aeb8c7; margin-left: 4px; }
.zoom-value { font-variant-numeric: tabular-nums; }
.reader-filename { flex: 1; text-align: right; color: #aeb8c7; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
.reader-body { position: relative; height: 510px; overflow: hidden; display: flex; align-items: flex-start; justify-content: center; padding-top: 26px; }
.paper { position: relative; width: 410px; min-height: 510px; padding: 28px 38px; border: 1px solid #56606e; box-shadow: 0 5px 20px #0003; }
.dark-paper { background: #171b21; color: #e6e5e2; }
.paper-topline { display: flex; justify-content: space-between; color: #929fae; font-size: 9px; font-weight: 500; letter-spacing: .1em; padding-bottom: 14px; border-bottom: 1px solid #3f4856; }
.paper-kicker { margin-top: 25px; font-size: 9px; letter-spacing: .1em; color: #99bce8; }
.paper h2 { font-family: Georgia, "Songti SC", serif; font-size: 40px; font-weight: 400; line-height: 1.12; margin: 12px 0 17px; }
.paper > p:not(.paper-kicker) { color: #b7c0cd; font-size: 12px; line-height: 1.7; margin-top: 10px; }
.paper mark { position: relative; white-space: nowrap; background: #3e608c; color: #f0f5fc; padding: 1px 3px; border-radius: 2px; }
.selected-passage { display: inline-block; position: relative; margin: 16px 0 12px; padding: 4px 6px; font-family: Georgia, "Songti SC", serif; font-size: 21px; line-height: 1.35; color: #d8e8fc; border-left: 2px solid #4f709b; padding-left: 12px; }
.selection-handle { position: absolute; width: 2px; height: 18px; background: #91beff; }
.selection-handle::after { position: absolute; content: ''; width: 6px; height: 6px; border-radius: 50%; background: #91beff; left: -2px; }
.selection-handle.start { top: 0; left: 0; }
.selection-handle.start::after { top: -4px; }
.selection-handle.end { bottom: 0; right: 0; }
.selection-handle.end::after { bottom: -4px; }
.paper-diagram { display: flex; align-items: center; gap: 8px; margin-top: 12px; }
.paper-diagram span { border: 1px solid #435268; border-radius: 4px; padding: 7px 9px; font-size: 10px; color: #b8c6d9; }
.paper-diagram i { height: 1px; width: 14px; background: #435268; }
.paper-footer { position: absolute; left: 38px; bottom: 17px; font-size: 8px; color: #77889c; letter-spacing: .06em; }
.explain-trigger { display: inline-flex; align-items: center; gap: 8px; position: absolute; z-index: 2; top: 300px; left: calc(50% + 62px); border: 1px solid #b7cfea; padding: 11px 14px; border-radius: 7px; background: #e7eff9; color: #243b5b; box-shadow: 0 8px 28px #0004; font-size: 12px; white-space: nowrap; }
.explain-trigger .icon { width: 17px; height: 17px; }
.explain-trigger:hover { background: #fff; }
.explanation-preview { position: absolute; top: 58px; right: 24px; width: 300px; padding: 18px 20px; background: #252d39; color: #ecebe9; border: 1px solid #64748c; border-radius: 10px; box-shadow: 0 12px 32px #0006; z-index: 3; font-size: 13px; }
.explanation-top { display: flex; align-items: center; justify-content: space-between; gap: 10px; padding-bottom: 12px; border-bottom: 1px solid #455063; font-size: 12px; }
.explanation-top > span { display: inline-flex; align-items: center; gap: 7px; }
.explanation-top .icon { width: 17px; height: 17px; }
.icon-button { display: grid; place-items: center; background: transparent; padding: 3px; border-radius: 3px; }
.icon-button:hover { background: #ffffff15; }
.example-label { font-size: 10px; color: #acb8cb; margin: 15px 0 5px; }
.explanation-preview h3 { font-size: 21px; margin-bottom: 10px; }
.explanation-preview p:not(.example-label) { margin-top: 10px; line-height: 1.75; color: #c8d1df; }
.followup-button { display: flex; align-items: center; justify-content: space-between; gap: 10px; margin-top: 16px; padding: 11px 0 0; width: 100%; background: transparent; color: #b5cff4; border-top: 1px solid #455063; text-align: left; font-size: 11px; }
.followup-button .icon { width: 16px; height: 16px; }
.reader-bottom { display: flex; align-items: center; justify-content: space-between; min-height: 38px; gap: 14px; padding: 9px 20px; background: #232932; color: #aeb8c7; font-size: 10px; }
.reader-bottom > span:last-child { display: inline-flex; align-items: center; gap: 7px; }
.reader-bottom .icon { width: 13px; height: 13px; }
.preview-label { letter-spacing: .08em; font-size: 9px; }
.hero-assurances { display: flex; justify-content: center; flex-wrap: wrap; gap: 38px; padding: 25px 0 18px; color: var(--muted); font-size: 12px; }
.hero-assurances span { display: flex; align-items: center; gap: 8px; }
.hero-assurances .icon { width: 17px; height: 17px; }
.feature-section { display: grid; grid-template-columns: .85fr 1.15fr; gap: 100px; align-items: center; padding: 116px 0 122px; }
.feature-icon { display: inline-grid; place-items: center; width: 44px; height: 44px; background: var(--soft-blue); color: var(--accent); border-radius: 12px; margin-bottom: 22px; }
.feature-icon .icon { width: 23px; height: 23px; }
.feature-copy > .eyebrow { margin-bottom: 14px; }
h2 { font-size: clamp(32px,4vw,48px); line-height: 1.17; }
.feature-copy > p:not(.eyebrow) { margin-top: 24px; color: var(--muted); font-size: 16px; line-height: 1.85; }
.feature-copy > p.small-note { margin-top: 16px; font-size: 13px; }
.feature-copy .text-link { margin-top: 24px; }
.comparison { display: flex; min-width: 0; overflow: hidden; border-radius: 14px; border: 1px solid var(--line); }
.comparison-half { flex: 1; width: 50%; min-width: 0; padding: 22px 17px 0; overflow: hidden; }
.comparison-label { display: flex; align-items: center; gap: 7px; font-size: 12px; padding-bottom: 22px; }
.comparison-label .icon { width: 17px; height: 17px; }
.comparison-light { background: #e9e9e6; color: #454b52; }
.comparison-dark { background: #252b34; color: #c6cfdd; border-left: 1px solid #394555; }
.mini-paper { min-height: 344px; padding: 26px 21px; box-shadow: 0 3px 18px #0001; }
.comparison-light .mini-paper { background: #faf9f6; border: 1px solid #d1d1ca; color: #343a42; }
.comparison-dark .mini-paper { background: #14191f; border: 1px solid #56616f; color: #dfdfdc; }
.mini-paper > span { font-size: 8px; letter-spacing: .08em; opacity: .7; }
.mini-paper h3 { font: 400 32px/1.15 Georgia,serif; margin: 20px 0 18px; }
.mini-paper p { font-size: 10px; opacity: .8; line-height: 1.8; }
.mini-lines { height: 46px; margin: 20px 0; opacity: .18; background: repeating-linear-gradient(currentColor 0 1px, transparent 1px 10px); }
.mini-paper p.mini-bottom { font-size: 9px; }
.ai-section { padding: 100px 0 90px; border-top: 1px solid var(--line); border-bottom: 1px solid var(--line); background: var(--section-bg); }
.section-heading { text-align: center; max-width: 780px; margin-inline: auto; }
.section-heading > .eyebrow { justify-content: center; margin-bottom: 20px; }
.section-heading > p:not(.eyebrow) { margin-top: 24px; color: var(--muted); line-height: 1.8; }
.ai-steps { display: grid; grid-template-columns: repeat(3,1fr); gap: 56px; margin-top: 65px; }
.step-number { color: var(--accent); font-size: 12px; display: block; padding-bottom: 16px; border-bottom: 1px solid var(--line); }
.ai-steps h3 { margin-top: 19px; font-size: 21px; }
.ai-steps p { margin-top: 10px; color: var(--muted); font-size: 14px; line-height: 1.8; }
.ai-choice { display: grid; grid-template-columns: .9fr 1fr 1fr; align-items: start; gap: 38px; border-top: 1px solid var(--line); margin-top: 60px; padding-top: 40px; }
.ai-choice h3 { font-size: 27px; line-height: 1.3; margin-top: 10px; }
.connection-title { font-size: 15px; font-weight: 600; }
.connection p { margin-top: 9px; color: var(--muted); font-size: 13px; line-height: 1.9; }
.ocr-section { display: grid; grid-template-columns: 1fr 1fr; align-items: center; gap: 120px; padding: 130px 0; }
.scan-illustration { position: relative; min-height: 405px; padding: 24px 36px; background: var(--soft-blue); border-radius: 14px; }
.scan-sheet { width: 100%; min-height: 340px; padding: 26px 28px; background: #f6f5f0; border: 1px solid #c7cdd4; color: #394351; box-shadow: 0 12px 28px #243b5b13; }
.scan-sheet > span { font-size: 9px; letter-spacing: .08em; color: #6e8095; }
.scan-sheet h3 { font: 400 36px/1.15 Georgia,serif; margin: 23px 0; }
.scan-sheet .scan-text { font-size: 17px; color: #405571; background: #b7cbe657; outline: 1px solid #7f9cc0; outline-offset: 4px; width: fit-content; }
.scan-line { width: 90%; height: 3px; background: #bac2cb; margin-top: 32px; }
.scan-line.short { width: 65%; margin-top: 11px; }
.ocr-tag { position: absolute; right: -20px; bottom: 16px; display: flex; align-items: center; gap: 8px; padding: 13px 17px; font-size: 13px; color: var(--ink); background: var(--surface); border: 1px solid var(--line); border-radius: 7px; box-shadow: 0 6px 24px #0001; }
.ocr-tag .icon { color: var(--accent); width: 19px; height: 19px; }
.scan-corner { position: absolute; width: 18px; height: 18px; border-color: #6c93c5; border-style: solid; }
.scan-corner.a { left: 23px; top: 12px; border-width: 2px 0 0 2px; }
.scan-corner.b { right: 23px; top: 12px; border-width: 2px 2px 0 0; }
.scan-corner.c { left: 23px; bottom: 28px; border-width: 0 0 2px 2px; }
.scan-corner.d { right: 23px; bottom: 28px; border-width: 0 2px 2px 0; }
.privacy-section { padding: 90px 0 70px; background: var(--section-bg); border-block: 1px solid var(--line); }
.privacy-section .feature-icon { margin-bottom: 18px; }
.privacy-section .section-heading > .eyebrow { margin-bottom: 18px; }
.privacy-grid { display: grid; grid-template-columns: repeat(3,1fr); gap: 50px; margin-top: 64px; }
.privacy-grid article > .icon { color: var(--accent); width: 25px; height: 25px; }
.privacy-grid h3 { font-size: 18px; margin-top: 18px; }
.privacy-grid p { color: var(--muted); font-size: 14px; margin-top: 12px; line-height: 1.85; }
.safety-note { display: flex; align-items: flex-start; gap: 12px; padding-top: 30px; margin-top: 46px; border-top: 1px solid var(--line); color: var(--muted); font-size: 12px; line-height: 1.8; }
.safety-note .icon { width: 19px; height: 19px; color: var(--accent); margin-top: 2px; }
.tools-section { display: grid; grid-template-columns: 1fr 1.2fr; gap: 100px; padding: 100px 0; align-items: center; }
.tools-section h2 { font-size: 36px; margin-top: 17px; }
.tool-list { display: grid; grid-template-columns: 1fr 1fr; gap: 29px 24px; font-size: 14px; }
.tool-list > span { display: flex; align-items: center; gap: 12px; }
.tool-list .icon { width: 23px; height: 23px; color: var(--muted); }
.download-section { background: var(--soft-blue); padding: 83px 0; border-block: 1px solid var(--line); }
.download-section > .section-wrap { display: grid; grid-template-columns: 1fr 1fr; gap: 120px; align-items: center; }
.download-intro > img { margin-bottom: 20px; border-radius: 14px; }
.download-intro h2 { font-size: 44px; }
.download-intro > p:not(.download-note) { margin: 19px 0 25px; color: var(--muted); }
.download-intro p.download-note { font-size: 12px; color: var(--muted); margin-top: 13px; }
.source-link { display: inline-block; margin-top: 16px; color: var(--muted); font-size: 12px; text-decoration: underline; text-underline-offset: 3px; }
.install-guide ol { list-style: none; margin: 25px 0 0; padding: 0; }
.install-guide li { display: flex; align-items: flex-start; gap: 17px; margin-top: 25px; }
.install-guide li > span { display: grid; place-items: center; width: 28px; height: 28px; flex: 0 0 28px; font-size: 12px; font-weight: 600; border: 1px solid var(--line); background: var(--surface); border-radius: 50%; color: var(--accent); }
.install-guide h3 { font-size: 17px; line-height: 1.6; }
.install-guide p { font-size: 13px; line-height: 1.9; margin-top: 4px; color: var(--muted); }
code { font-family: ui-monospace,SFMono-Regular,Consolas,monospace; font-size: .92em; color: var(--ink); }
.install-guide strong { color: var(--ink); font-weight: 500; }
.copy-button { display: inline-flex; gap: 7px; align-items: center; color: var(--accent); background: transparent; padding: 7px 0 0; font-size: 12px; }
.copy-button .icon { width: 14px; height: 14px; }
.copy-button.copied { color: #397b52; }
.clipboard-helper { position: fixed; width: 1px; height: 1px; opacity: 0; inset: 0; }
.faq-section { padding: 90px 0; display: grid; grid-template-columns: 1fr 1.4fr; gap: 80px; }
.faq-section h2 { font-size: 34px; }
.faq-list details { border-bottom: 1px solid var(--line); padding: 20px 0; }
.faq-list details:first-child { padding-top: 0; }
.faq-list summary { cursor: pointer; display: flex; align-items: center; justify-content: space-between; gap: 20px; list-style: none; font-size: 15px; font-weight: 500; }
.faq-list summary::-webkit-details-marker { display: none; }
.faq-list summary .icon { color: var(--muted); width: 17px; height: 17px; }
.faq-list details[open] summary .icon { transform: rotate(45deg); }
.faq-list details p { color: var(--muted); font-size: 13px; line-height: 1.9; margin-top: 16px; }
.site-footer { padding: 32px 0 40px; border-top: 1px solid var(--line); display: flex; align-items: center; justify-content: space-between; gap: 30px; }
.site-footer .brand { font-size: 16px; gap: 9px; }
.site-footer > div { display: flex; align-items: center; gap: 28px; color: var(--muted); font-size: 12px; }
html[data-language="zh"] .eyebrow { letter-spacing: .03em; }
html[data-language="zh"] .hero h1 { font-size: clamp(46px,5vw,66px); line-height: 1.22; }
html[data-language="zh"] .hero-summary > p:first-child { font-size: 17px; }
html[data-language="zh"] h2 { line-height: 1.4; }
html[data-language="zh"] .paper h2 { font-size: 34px; line-height: 1.25; }
html[data-language="zh"] .paper p:not(.paper-kicker) { line-height: 1.9; }
html[data-language="zh"] .feature-copy h2,html[data-language="zh"] .section-heading h2 { font-size: clamp(32px,3.4vw,43px); }
html[data-language="zh"] .hero-actions { gap: 16px; }
@media (max-width: 1120px) {
 .nav-wrap { gap: 25px; }
 .main-nav { gap: 20px; font-size: 13px; }
 .nav-actions { gap: 18px; }
 .hero-intro { gap: 36px; }
 .hero-summary > p:first-child { font-size: 16px; }
 .hero-actions { gap: 13px; }
 .hero-actions .button { padding: 14px 18px; font-size: 14px; }
 .hero-actions .text-link { font-size: 13px; }
 .feature-section { gap: 60px; }
 .ocr-section { gap: 76px; }
 .download-section > .section-wrap { gap: 70px; }
 .tools-section { gap: 60px; }
 .reader-stage { padding-inline: 28px; }
}
@media (max-width: 900px) {
 .section-wrap { width: calc(100% - 56px); }
 .nav-wrap { width: calc(100% - 48px); min-height: 70px; }
 .main-nav { display: none; }
 .nav-actions { margin-left: auto; }
 .hero { padding-top: 50px; }
 .hero-intro { grid-template-columns: 1fr 1fr; }
 .hero h1 { font-size: 57px; }
 .hero-summary > p:first-child { font-size: 15px; }
 .hero-actions { gap: 14px; }
 .hero-actions .text-link { font-size: 14px; }
 .hero-note { font-size: 11px; }
 .reader-filename { display: none; }
 .reader-tools { margin-left: auto; }
 .reader-identity { flex: none; }
 .reader-stage { padding-inline: 20px; }
 .explanation-preview { right: 12px; width: 280px; }
 .feature-section { gap: 40px; padding: 85px 0; }
 .comparison-half { padding-inline: 11px; }
 .mini-paper { padding-inline: 14px; }
 .mini-paper h3 { font-size: 27px; }
 .ai-section { padding: 80px 0; }
 .ai-steps { gap: 30px; }
 .ai-choice { grid-template-columns: 1fr 1fr; gap: 28px; }
 .ai-choice > div:first-child { grid-column: 1/-1; }
 .ai-choice h3 { font-size: 29px; }
 .ocr-section { gap: 60px; padding: 90px 0; }
 .scan-illustration { min-height: 370px; padding-inline: 25px; }
 .scan-sheet { padding-inline: 20px; min-height: 310px; }
 .scan-sheet h3 { font-size: 30px; }
 .scan-sheet .scan-text { font-size: 14px; }
 .privacy-grid { gap: 28px; }
 .privacy-grid h3 { font-size: 17px; }
 .tools-section { gap: 35px; }
 .tool-list { font-size: 13px; gap: 24px 18px; }
 .download-section > .section-wrap { gap: 48px; }
 .download-intro h2 { font-size: 39px; }
 .faq-section { gap: 45px; }
}
@media (max-width: 650px) {
 html { scroll-padding-top: 88px; }
 .section-wrap { width: calc(100% - 40px); }
 .nav-wrap { width: calc(100% - 32px); min-height: 66px; gap: 12px; }
 .brand { font-size: 17px; gap: 8px; }
 .nav-wrap .brand img { width: 29px; height: 29px; border-radius: 7px; }
 .nav-actions { gap: 14px; }
 .language-button { font-size: 12px; }
 .button-small { padding: 9px 11px; font-size: 12px; }
 .hero { padding-top: 41px; }
 .hero-intro { display: block; margin-bottom: 32px; }
 .hero h1 { font-size: 60px; line-height: 1.07; margin-top: 18px; }
 .hero-summary { margin-top: 24px; }
 .hero-summary > p:first-child { max-width: 440px; font-size: 16px; line-height: 1.75; }
 .hero-actions { margin-top: 23px; gap: 19px; }
 .hero-note { font-size: 12px; margin-top: 15px; }
 .reader-stage { padding: 12px 10px 0; border-radius: 12px; }
 .reader-toolbar { height: 44px; padding: 0 11px; }
 .reader-identity { gap: 6px; font-size: 11px; }
 .reader-identity img { width: 20px; height: 20px; }
 .reader-tools { gap: 9px; }
 .reader-tools > .icon { display: none; }
 .reader-tools .toolbar-divider { display: none; }
 .reader-toolbar { font-size: 11px; }
 .reader-tools .zoom-value { display: none; }
 .reader-body { height: 427px; padding-top: 19px; }
 .paper { width: 286px; min-height: 450px; padding: 23px 25px; }
 .paper h2 { font-size: 34px; margin-block: 10px 14px; }
 .paper > p:not(.paper-kicker) { font-size: 11px; }
 .paper-kicker { margin-top: 20px; font-size: 8px; }
 .paper-topline { font-size: 8px; padding-bottom: 10px; }
 .selected-passage { font-size: 19px; margin-top: 15px; }
 .paper-diagram { gap: 7px; margin-top: 10px; }
 .paper-diagram span { font-size: 8px; padding: 6px 7px; }
 .paper-diagram i { width: 10px; }
 .paper-footer { left: 25px; font-size: 7px; }
 .explain-trigger { top: 245px; left: auto; right: 12px; font-size: 11px; padding: 10px 11px; }
 .explanation-preview { top: 32px; left: 12px; right: 12px; width: auto; max-height: 377px; overflow-y: auto; padding: 15px 17px; font-size: 12px; }
 .explanation-preview h3 { font-size: 20px; }
 .explanation-preview p:not(.example-label) { line-height: 1.75; }
 .reader-bottom { font-size: 9px; min-height: 35px; padding: 7px 10px; }
 .preview-label { font-size: 8px; letter-spacing: .03em; }
 .reader-bottom > span:last-child { gap: 4px; }
 .reader-bottom .icon { display: none; }
 .hero-assurances { gap: 10px 19px; padding: 20px 0 0; font-size: 10px; justify-content: flex-start; }
 .hero-assurances .icon { width: 14px; height: 14px; }
 .hero-assurances > span { gap: 6px; }
 .feature-section { grid-template-columns: 1fr; gap: 35px; padding: 74px 0; }
 .feature-icon { width: 41px; height: 41px; margin-bottom: 17px; }
 h2 { font-size: 38px; }
 .feature-copy h2 br { display: none; }
 .feature-copy > p:not(.eyebrow) { font-size: 15px; margin-top: 20px; }
 .feature-copy > p.small-note { font-size: 12px; margin-top: 12px; }
 .comparison-half { padding-top: 18px; padding-inline: 14px; }
 .comparison-label { padding-bottom: 17px; font-size: 11px; }
 .mini-paper { min-height: 315px; padding: 21px 15px; }
 .mini-paper h3 { font-size: 28px; }
 .mini-paper > span { font-size: 7px; }
 .mini-paper p { font-size: 9px; }
 .mini-paper p.mini-bottom { font-size: 8px; }
 .ai-section { padding: 65px 0; }
 .section-heading h2 { font-size: 39px; }
 .section-heading > p:not(.eyebrow) { font-size: 15px; margin-top: 20px; }
 .section-heading > p:not(.eyebrow) br { display: none; }
 .ai-steps { grid-template-columns: 1fr; gap: 27px; margin-top: 39px; }
 .ai-steps > div { position: relative; padding-left: 45px; }
 .step-number { position: absolute; top: 3px; left: 0; padding: 0; border: 0; }
 .ai-steps h3 { margin-top: 0; font-size: 21px; }
 .ai-steps p { margin-top: 7px; font-size: 14px; }
 .ai-choice { margin-top: 38px; padding-top: 30px; grid-template-columns: 1fr; gap: 24px; }
 .ai-choice h3 { font-size: 28px; }
 .connection p { max-width: 440px; font-size: 14px; }
 .ocr-section { grid-template-columns: 1fr; gap: 39px; padding: 75px 0; }
 .ocr-section .feature-copy { order: -1; }
 .scan-illustration { width: calc(100% - 18px); min-height: 390px; margin-left: 0; padding-inline: 31px; }
 .scan-sheet { min-height: 328px; padding-inline: 23px; }
 .scan-sheet h3 { font-size: 34px; }
 .scan-sheet .scan-text { font-size: 16px; }
 .ocr-tag { right: -18px; font-size: 12px; }
 .privacy-section { padding: 65px 0 42px; }
 .privacy-section .section-heading h2 { font-size: 33px; }
 .privacy-grid { grid-template-columns: 1fr; gap: 29px; margin-top: 43px; }
 .privacy-grid article { position: relative; padding-left: 40px; }
 .privacy-grid article > .icon { position: absolute; top: 2px; left: 0; width: 23px; height: 23px; }
 .privacy-grid h3 { margin: 0; font-size: 19px; }
 .privacy-grid p { margin-top: 8px; font-size: 14px; }
 .safety-note { padding-top: 23px; margin-top: 30px; font-size: 12px; }
 .tools-section { grid-template-columns: 1fr; gap: 35px; padding: 66px 0; }
 .tools-section h2 { font-size: 33px; }
 .tools-section h2 br { display: none; }
 .tool-list { gap: 24px 14px; font-size: 12px; }
 .tool-list > span { gap: 9px; align-items: flex-start; }
 .tool-list .icon { width: 21px; height: 21px; }
 .download-section { padding: 61px 0; }
 .download-section > .section-wrap { grid-template-columns: 1fr; gap: 45px; }
 .download-intro h2 { font-size: 39px; }
 .download-intro > img { width: 52px; height: 52px; border-radius: 12px; }
 .install-guide { border-top: 1px solid var(--line); padding-top: 33px; }
 .install-guide p { font-size: 14px; }
 .install-guide h3 { font-size: 18px; }
 .install-guide li { gap: 15px; margin-top: 26px; }
 .install-guide .eyebrow { font-size: 13px; }
 .faq-section { grid-template-columns: 1fr; gap: 32px; padding: 62px 0; }
 .faq-section h2 { font-size: 32px; }
 .faq-list summary { font-size: 15px; }
 .faq-list details p { font-size: 14px; }
 .site-footer { align-items: flex-start; gap: 24px; flex-direction: column; padding: 29px 0; }
 .site-footer > div { flex-wrap: wrap; gap: 19px; font-size: 12px; }
 html[data-language="zh"] .hero h1 { font-size: 48px; line-height: 1.27; }
 html[data-language="zh"] .hero-summary > p:first-child { font-size: 16px; }
 html[data-language="zh"] .paper h2 { font-size: 30px; }
 html[data-language="zh"] .paper p:not(.paper-kicker) { line-height: 1.85; }
 html[data-language="zh"] .feature-copy h2,html[data-language="zh"] .section-heading h2 { font-size: 34px; }
 html[data-language="zh"] .feature-copy h2 br { display: initial; }
}
@media (max-width: 380px) {
 .brand { font-size: 16px; gap: 6px; }
 .nav-actions { gap: 11px; }
 .button-small { padding-inline: 9px; font-size: 11px; }
 .language-button { font-size: 11px; }
 .section-wrap { width: calc(100% - 32px); }
 .reader-stage { padding-inline: 7px; }
 .hero-actions { gap: 14px; }
 .hero-actions .button { padding-inline: 14px; }
 .hero-actions .text-link { font-size: 12px; }
}
@media (prefers-reduced-motion: reduce) { *,*::before,*::after { scroll-behavior: auto !important; transition: none !important; animation: none !important; } }