@font-face {
  font-family: "Noto Serif SC";
  src: url("/fonts/NotoSerifSC-sub.woff2") format("woff2");
  font-weight: 100 900;
  font-display: swap;
}

@font-face {
  font-family: "Noto Sans SC";
  src: url("/fonts/NotoSansSC-sub.woff2") format("woff2");
  font-weight: 100 900;
  font-display: swap;
}

:root {
  --ink: #15181f;
  --ink-2: #1b1f28;
  --paper: #f7f4ec;
  --accent: #2aa6bd;
  --accent-deep: #0e7490;
  --mist: rgba(247, 244, 236, .66);
  --muted: rgba(247, 244, 236, .48);
  --paper-muted: #6e6658;
  --line: rgba(247, 244, 236, .13);
  --serif: "Noto Serif SC", Georgia, serif;
  --sans: "Noto Sans SC", system-ui, sans-serif;
}

* { box-sizing: border-box; margin: 0; }
html { scroll-behavior: smooth; }
body { background: var(--ink); color: var(--paper); font-family: var(--sans); -webkit-font-smoothing: antialiased; }
a { color: inherit; }
.skip-link { background: var(--paper); border-radius: 8px; color: var(--ink); font-size: 14px; font-weight: 800; left: 16px; padding: 10px 14px; position: fixed; text-decoration: none; top: 16px; transform: translateY(-200%); z-index: 100; }
.skip-link:focus { transform: none; }
.dotgrid { position: fixed; inset: 0; pointer-events: none; z-index: -1; background-image: radial-gradient(rgba(247,244,236,.075) 1px, transparent 1px); background-size: 26px 26px; }
.wrap { max-width: 1200px; margin: 0 auto; padding: 0 32px; }
.narrow { max-width: 850px; }

nav { max-width: 1280px; height: 72px; padding: 0 32px; margin: 0 auto; display: flex; align-items: center; justify-content: space-between; }
.wordmark { color: var(--paper); display: inline-flex; align-items: center; gap: 10px; font-family: var(--serif); font-size: 19px; font-weight: 900; letter-spacing: .04em; text-decoration: none; }
.mark { width: 22px; }
.nav-right { display: flex; align-items: center; gap: 28px; }
.nav-link, footer a { color: var(--mist); font-size: 14px; text-decoration: none; }
.nav-link, .nav-cta { align-items: center; display: inline-flex; justify-content: center; min-height: 44px; min-width: 44px; }
.nav-link:hover, footer a:hover { color: var(--paper); }
.nav-cta { border: 1px solid rgba(247,244,236,.32); border-radius: 999px; font-size: 14px; font-weight: 600; padding: 8px 18px; text-decoration: none; }
.nav-cta:hover { border-color: var(--paper); }
a:focus-visible { outline: 3px solid #7dd3fc; outline-offset: 4px; }

.hero { max-width: 1280px; min-height: calc(100dvh - 72px); padding: 36px 32px 96px; margin: 0 auto; display: grid; grid-template-columns: minmax(0, 45fr) minmax(0, 55fr); gap: 36px; align-items: center; }
.eyebrow, .label { color: var(--accent); font-size: 11px; font-weight: 800; letter-spacing: .14em; line-height: 1.5; text-transform: uppercase; }
.eyebrow { margin-bottom: 18px; }
h1, h2 { font-family: var(--serif); font-weight: 900; letter-spacing: .01em; }
h1 { font-size: clamp(44px, 5.4vw, 78px); line-height: 1.22; margin-bottom: 30px; }
h2 { font-size: clamp(30px, 3vw, 42px); line-height: 1.42; margin-bottom: 18px; }
.accent { color: var(--accent); text-decoration: underline wavy rgba(42,166,189,.85); text-decoration-thickness: 3px; text-underline-offset: 16px; }
.sub, .lead { color: var(--mist); font-size: 16px; line-height: 2; max-width: 39em; }
.sub { font-size: 17px; margin-bottom: 42px; }
html[lang="zh-CN"] .eyebrow, html[lang="zh-CN"] .label { letter-spacing: .1em; }
html[lang="zh-CN"] .sub, html[lang="zh-CN"] .lead { line-height: 1.9; }
.cta-row { display: flex; flex-wrap: wrap; align-items: center; gap: 22px; }
.cta { background: var(--accent-deep); border-radius: 999px; color: white; display: inline-flex; gap: 10px; font-size: 16px; font-weight: 750; padding: 15px 28px; text-decoration: none; transition: background .15s ease, transform .15s ease; }
.cta:hover { background: #0891b2; }
.cta:active { transform: scale(.98); }
.cta-ghost { border-bottom: 1px solid rgba(247,244,236,.3); color: var(--mist); font-size: 15px; padding-bottom: 3px; text-decoration: none; }
.cta-ghost:hover { color: var(--paper); }
.guide-prompt { margin-top: 24px; }.guide-prompt a, .text-link { color: var(--accent); font-size: 15px; font-weight: 700; text-underline-offset: 4px; }

.diagram { position: relative; }
.hero-demo { height: 680px; min-height: 450px; }
.card { background: var(--paper); border-radius: 14px; box-shadow: 0 18px 44px -18px rgba(0,0,0,.55), 0 2px 6px rgba(0,0,0,.28); color: #23262e; padding: 16px 20px; position: absolute; }
.card .label, .card .card-meta { color: var(--paper-muted); display: block; margin-bottom: 8px; }
.book-card { left: 4%; top: 3%; transform: rotate(-2deg); width: 290px; }
.book-card strong { display: block; font-family: var(--serif); font-size: 19px; margin: 8px 0; }
.book-card span:last-child { color: #6e695f; font-size: 13px; }
.feed-card { left: 18%; top: 27%; transform: rotate(1deg); width: 330px; }
.feed-card p { font-family: var(--serif); font-size: 17px; line-height: 1.75; }
.card-meta { font-size: 11px; margin-top: 12px; }
.card-question { background: var(--ink-2); border: 1px solid rgba(42,166,189,.55); color: var(--paper); right: 2%; top: 58%; transform: rotate(-.7deg); width: 265px; }
.card-question .label { color: var(--accent); }
.card-question p, .card-answer p { font-size: 13.5px; line-height: 1.8; }
.card-answer { background: var(--accent-deep); bottom: 3%; color: white; right: 7%; transform: rotate(.5deg); width: 308px; }
.card-answer .label { color: white; }
.hero-demo.is-visible .card-answer { box-shadow: 0 0 0 4px rgba(42,166,189,.18), 0 18px 44px -18px rgba(0,0,0,.55); }
.demo-lines { height: 100%; inset: 0; overflow: visible; pointer-events: none; position: absolute; width: 100%; }
.demo-lines path, .connection path { fill: none; stroke: var(--accent); stroke-dasharray: 6 8; stroke-linecap: round; stroke-width: 2; }

.manifesto { border-top: 1px solid var(--line); padding: 130px 0; text-align: center; }
.big { font-size: clamp(32px, 4vw, 52px); line-height: 1.55; }
.centered { margin: 26px auto 0; }
.feature-section { padding: 110px 0; }
.feature-alt { background: rgba(247,244,236,.025); border-block: 1px solid var(--line); }
.feature { display: grid; grid-template-columns: minmax(0, 5fr) minmax(0, 7fr); gap: 64px; align-items: center; }
.feature.flip .f-copy { order: 2; }
.feature.flip .f-demo { order: 1; }
.f-demo { height: 390px; }

.import-demo { background: linear-gradient(130deg, rgba(42,166,189,.09), transparent 60%); border: 1px solid var(--line); border-radius: 24px; overflow: visible; }
.mini-book { background: #dad3c1; border-radius: 4px; box-shadow: 12px 18px 24px rgba(0,0,0,.28); color: #39362f; font-family: var(--serif); font-size: 12px; font-weight: 800; left: 7%; line-height: 1.6; padding: 38px 22px; position: absolute; top: 72px; transform: rotate(-8deg); width: 130px; }
.mini-book span { color: #5f594f; font-family: var(--sans); font-size: 9px; font-weight: 600; }
.mini-card { background: var(--paper); border-radius: 12px; box-shadow: 0 14px 32px rgba(0,0,0,.28); color: #292b31; display: flex; gap: 14px; line-height: 1.55; padding: 15px; position: absolute; width: 280px; }
.mini-card b { color: var(--accent-deep); font-size: 12px; }
.mini-card span { font-size: 13px; }
.mini-card.first { right: 10%; top: 62px; }.mini-card.second { right: 4%; top: 163px; }.mini-card.third { right: 10%; top: 264px; }

.passage-demo { background: #f0ece2; border-radius: 18px; color: #292a2d; height: 460px; padding: 46px; }
.excerpt { font-family: var(--serif); line-height: 2; max-width: 390px; }
.excerpt .label { color: var(--paper-muted); display: block; margin-bottom: 14px; }.excerpt p { font-size: 18px; }.excerpt footer { border: 0; color: var(--paper-muted); font-family: var(--sans); font-size: 12px; margin-top: 16px; padding: 0; }
mark { background: rgba(42,166,189,.17); border-bottom: 2px solid var(--accent); color: inherit; padding: 1px 2px; }
.ask-pill { background: var(--accent-deep); border-radius: 999px; bottom: 125px; color: white; font-size: 12px; font-weight: 750; padding: 9px 14px; position: absolute; right: 28px; }
.context-note { background: var(--ink-2); border: 1px solid rgba(42,166,189,.5); border-radius: 10px; bottom: 25px; box-shadow: 0 14px 30px rgba(0,0,0,.32); color: var(--paper); font-size: 12px; line-height: 1.7; padding: 13px; position: absolute; right: 25px; width: min(230px, calc(100% - 50px)); }.context-note .label { display: block; margin-bottom: 4px; }

.source-demo { background: linear-gradient(120deg, rgba(42,166,189,.08), transparent); border: 1px solid var(--line); border-radius: 22px; }
.source-side, .answer-side { border-radius: 12px; padding: 20px; position: absolute; top: 90px; width: 45%; }
.source-side { background: var(--paper); color: #2c2d32; left: 4%; transform: rotate(-1deg); }.source-side .label { color: var(--paper-muted); }.source-side p { font-family: var(--serif); font-size: 16px; line-height: 1.8; margin-top: 11px; }
.answer-side { background: var(--ink-2); border: 1px solid rgba(42,166,189,.5); right: 4%; }.answer-side p { font-size: 13px; line-height: 1.8; margin: 10px 0; }.answer-side a { color: var(--accent); font-size: 12px; text-decoration: none; }.connection { height: 100%; position: absolute; width: 100%; }.connection path { stroke-dasharray: none; }

.progress-demo { background: #f3efe6; border-radius: 18px; color: #303138; padding: 34px; }.progress-head { display: flex; font-family: var(--serif); font-size: 16px; justify-content: space-between; }.progress-head span:last-child { color: var(--accent-deep); font-family: var(--sans); font-size: 12px; font-weight: 800; }.progress-track { background: #d8d2c3; border-radius: 99px; height: 5px; margin: 16px 0 23px; }.progress-track span { background: var(--accent-deep); border-radius: inherit; display: block; height: 100%; width: 43%; }.progress-demo ol { list-style: none; }.progress-demo li { align-items: center; border-top: 1px solid #ddd6c7; display: flex; gap: 15px; padding: 15px 0; }.progress-demo li > span { color: var(--paper-muted); font-size: 12px; }.progress-demo li div { flex: 1; }.progress-demo b { display: block; font-size: 13px; }.progress-demo small { color: var(--paper-muted); font-size: 11px; }.progress-demo i { color: var(--accent-deep); font-style: normal; }.progress-demo .current b { color: var(--accent-deep); }

.ocr-demo { align-items: center; background: linear-gradient(110deg, rgba(42,166,189,.08), transparent); border: 1px solid var(--line); border-radius: 22px; display: flex; gap: 28px; justify-content: center; }.scan-page, .text-page { height: 245px; width: 180px; }.scan-page { background: #d3cebf; box-shadow: 8px 12px 20px rgba(0,0,0,.28); padding: 34px 18px; transform: rotate(-4deg); }.scan-tag { background: var(--paper-muted); color: white; font-size: 9px; padding: 4px 6px; }.scan-lines { background: rgba(70,66,55,.32); height: 5px; margin-top: 18px; width: 100%; }.scan-lines.short { width: 65%; }.scan-lines.wide { width: 86%; }.ocr-arrow { color: var(--accent); font-size: 29px; }.text-page { background: var(--paper); border-radius: 6px; box-shadow: 8px 12px 20px rgba(0,0,0,.28); color: #303138; padding: 30px 20px; transform: rotate(3deg); }.text-page .label { color: var(--paper-muted); display: block; }.text-page p { font-family: var(--serif); font-size: 16px; line-height: 1.7; margin: 24px 0; }.text-highlight { background: rgba(42,166,189,.16); border-bottom: 2px solid var(--accent); font-size: 11px; padding: 3px; }

.faq-section { border-top: 1px solid var(--line); padding: 120px 0; }.faq-list { border-top: 1px solid var(--line); margin-top: 36px; }.faq-list details { border-bottom: 1px solid var(--line); padding: 22px 0; }.faq-list summary { cursor: pointer; font-family: var(--serif); font-size: 18px; font-weight: 800; list-style-position: outside; padding-right: 30px; }.faq-list p { color: var(--mist); font-size: 15px; line-height: 1.9; margin-top: 15px; max-width: 42em; }
.closing { background: rgba(42,166,189,.09); border-top: 1px solid rgba(42,166,189,.26); padding: 120px 0; text-align: center; }.closing .cta { margin-top: 18px; }.closing .eyebrow { color: var(--accent); }
footer { border-top: 1px solid var(--line); padding: 28px 0; }footer .wrap { align-items: center; display: flex; justify-content: space-between; }footer div:last-child { display: flex; gap: 22px; }

.guide-shell { margin: 0 auto; max-width: 820px; padding: 56px 32px 112px; }.guide-intro { border-bottom: 1px solid var(--line); padding: 36px 0 56px; }.guide-intro h1, .article-header h1 { font-size: clamp(38px, 5vw, 62px); line-height: 1.18; }.guide-intro > p:last-child, .guide-card p { color: var(--mist); font-size: 17px; line-height: 1.9; max-width: 42em; }.guide-list { padding-top: 42px; }.guide-card { border: 1px solid var(--line); border-radius: 16px; padding: 32px; }.guide-card h2 { font-size: clamp(26px, 3vw, 34px); margin-bottom: 12px; }.guide-card h2 a { text-decoration-color: rgba(42,166,189,.55); text-underline-offset: 5px; }.guide-card .text-link { display: inline-block; margin-top: 22px; }.breadcrumbs { color: var(--muted); display: flex; flex-wrap: wrap; font-size: 14px; gap: 9px; margin: 0 0 38px; }.breadcrumbs a { color: var(--mist); text-underline-offset: 4px; }.article-header { border-bottom: 1px solid var(--line); margin-bottom: 34px; padding-bottom: 34px; }.byline { color: var(--mist); font-size: 15px; }.direct-answer { color: var(--paper); font-family: var(--serif); font-size: 21px; line-height: 1.8; margin-bottom: 52px; }.guide-article > section { margin-top: 42px; }.guide-article h2 { font-size: clamp(27px, 3.2vw, 38px); line-height: 1.3; }.guide-article section > p { color: var(--mist); font-size: 17px; line-height: 1.95; max-width: 43em; }.guide-faq { border-top: 1px solid var(--line); padding-top: 44px; }.guide-faq-title { color: var(--paper) !important; font-family: var(--serif); font-size: clamp(27px, 3.2vw, 38px) !important; font-weight: 900; line-height: 1.3 !important; margin-bottom: 18px; }.guide-faq details { border-bottom: 1px solid var(--line); padding: 19px 0; }.guide-faq summary { cursor: pointer; font-family: var(--serif); font-size: 18px; font-weight: 800; line-height: 1.5; padding-right: 26px; }.guide-faq details p { color: var(--mist); font-size: 16px; line-height: 1.9; margin-top: 13px; }.article-cta { background: rgba(42,166,189,.09); border: 1px solid rgba(42,166,189,.28); border-radius: 16px; margin-top: 54px; padding: 32px; }.article-cta p { color: var(--paper) !important; font-family: var(--serif); font-size: 21px !important; line-height: 1.5 !important; margin-bottom: 20px; }

@media (prefers-reduced-motion: reduce) { *, *::before, *::after { scroll-behavior: auto !important; transition-duration: .01ms !important; } }
@media (max-width: 768px) { .wrap, nav, .hero, .guide-shell { padding-left: 20px; padding-right: 20px; }nav { height: auto; min-height: 72px; align-items: flex-start; flex-wrap: wrap; gap: 12px; padding-bottom: 14px; padding-top: 14px; }.nav-right { flex-wrap: wrap; gap: 8px; width: 100%; }.nav-link { font-size: 13px; }.nav-cta { padding: 7px 11px; }.hero, .feature { grid-template-columns: minmax(0, 1fr); }.hero { padding-top: 50px; }.hero-demo { height: 670px; min-height: 0; }.hero-demo .card { left: 50%; right: auto; width: min(460px, calc(100% - 24px)); transform: translateX(-50%); }.book-card { top: 12px; }.feed-card { top: 192px; }.card-question { top: 405px; }.card-answer { bottom: auto; top: 525px; }.feature-section { padding: 78px 0; }.feature.flip .f-copy, .feature.flip .f-demo { order: initial; }.f-demo { height: 350px; }.passage-demo { height: 460px; padding: 30px; }.source-side, .answer-side { top: 65px; }.ocr-demo { gap: 12px; }.scan-page, .text-page { transform: scale(.82); }.ocr-arrow { margin-inline: -16px; }.guide-shell { padding-top: 30px; padding-bottom: 72px; }.guide-intro { padding-top: 20px; }.guide-card, .article-cta { padding: 24px; }.direct-answer { font-size: 19px; } }
@media (max-width: 540px) { .book-card strong { font-size: 18px; }.feed-card p { font-size: 16px; line-height: 1.6; }.card-question p, .card-answer p { line-height: 1.6; }.import-demo { height: 410px; overflow: visible; }.mini-book { left: 50%; top: 16px; transform: translateX(-50%); }.mini-card { left: 12px; right: 12px; width: auto; }.mini-card.first { right: 12px; top: 175px; }.mini-card.second { right: 12px; top: 250px; }.mini-card.third { right: 12px; top: 325px; }.source-demo { height: 440px; }.source-side, .answer-side { left: 12px; padding: 16px; right: 12px; transform: none; width: auto; }.source-side { top: 18px; }.answer-side { top: 190px; }.connection { display: none; }.progress-demo { height: 390px; padding: 26px; }.ocr-demo { gap: 4px; }.scan-page, .text-page { height: 188px; transform: none; width: 120px; }.scan-page { padding: 26px 12px; }.text-page { padding: 16px 10px; }.text-page p { font-size: 13px; line-height: 1.5; margin: 10px 0; }.text-highlight { font-size: 10px; }.ocr-arrow { font-size: 18px; margin-inline: 0; } }