:root {
  --paper: #f7f5ef;
  --paper-bright: #fffef9;
  --ink: #171717;
  --muted: #66645f;
  --line: #d9d5cb;
  --red: #c0392f;
  --red-dark: #a92d22;
  --blue: #246fa8;
  --blue-soft: #e5f2fa;
  --dark: #1c2022;
  --max: 1180px;
}

* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: "Microsoft YaHei UI", "PingFang SC", "Noto Sans CJK SC", system-ui, sans-serif;
  font-size: 16px;
  line-height: 1.7;
  letter-spacing: 0;
}
img { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button, a { -webkit-tap-highlight-color: transparent; }

.skip-link {
  position: fixed;
  top: 8px;
  left: 8px;
  z-index: 100;
  padding: 8px 12px;
  background: var(--ink);
  color: #fff;
  transform: translateY(-150%);
}
.skip-link:focus { transform: translateY(0); }

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 50;
  height: 68px;
  display: grid;
  grid-template-columns: 1fr auto 1fr;
  align-items: center;
  gap: 24px;
  padding: 0 max(24px, calc((100vw - var(--max)) / 2));
  border-bottom: 1px solid transparent;
  transition: background-color 180ms ease, border-color 180ms ease;
}
.site-header.scrolled {
  background: rgba(247, 245, 239, .94);
  border-color: var(--line);
  backdrop-filter: blur(14px);
}
.brand { display: inline-flex; align-items: center; gap: 10px; font-weight: 800; }
.brand img { border-radius: 7px; }
.desktop-nav { display: flex; align-items: center; gap: 30px; font-size: 14px; }
.desktop-nav a:hover, .site-footer a:hover { color: var(--red); }
.header-download {
  justify-self: end;
  display: inline-flex;
  align-items: center;
  min-height: 40px;
  padding: 0 16px;
  border: 1px solid var(--ink);
  background: var(--ink);
  color: #fff;
  font-size: 14px;
  font-weight: 700;
}

.hero {
  position: relative;
  min-height: min(860px, 96vh);
  display: flex;
  align-items: center;
  overflow: hidden;
  padding: 96px 24px 70px;
  background: var(--paper-bright);
}
.hero-layout {
  width: min(var(--max), 100%);
  margin: 0 auto;
  display: grid;
  grid-template-columns: minmax(360px, .78fr) minmax(0, 1.22fr);
  gap: 64px;
  align-items: center;
}
.hero-content {
  position: relative;
  z-index: 1;
  width: 100%;
}
.eyebrow, .section-kicker {
  margin: 0 0 16px;
  color: var(--red);
  font-size: 13px;
  font-weight: 800;
  text-transform: uppercase;
}
h1, h2, h3, p { overflow-wrap: anywhere; }
h1 { margin: 0; font-size: clamp(56px, 5.5vw, 72px); line-height: .92; font-weight: 900; white-space: nowrap; }
.hero-lead { max-width: 560px; margin: 30px 0 0; font-size: clamp(23px, 2.8vw, 38px); line-height: 1.35; font-weight: 650; }
.hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 34px; }
.button {
  min-height: 52px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 9px;
  padding: 0 22px;
  border: 1px solid var(--ink);
  font-weight: 750;
  transition: transform 150ms ease, box-shadow 150ms ease, background-color 150ms ease;
}
.button:hover { transform: translateY(-2px); box-shadow: 4px 4px 0 var(--red); }
.button-primary { background: var(--ink); color: #fff; }
.button-secondary { background: rgba(255,255,255,.82); color: var(--ink); }
.hero-meta { margin: 18px 0 0; color: var(--muted); font-size: 13px; }
.hero-visual { margin: 0; border: 1px solid var(--line); background: #fff; box-shadow: 18px 18px 0 #e7e3d9; }
.hero-visual img { width: 100%; aspect-ratio: 16 / 9; object-fit: cover; }
.hero-visual figcaption { padding: 12px 14px; border-top: 1px solid var(--line); color: var(--muted); font-size: 12px; }
.hero-next { position: absolute; z-index: 2; bottom: 25px; left: 50%; transform: translateX(-50%); font-size: 13px; font-weight: 700; }

.section { padding: 112px 24px; }
.section-inner { width: min(var(--max), 100%); margin: 0 auto; }
.story { background: var(--paper); }
.story-grid { display: grid; grid-template-columns: minmax(0, .9fr) minmax(0, 1.1fr); gap: 9vw; align-items: start; }
h2 { margin: 0; font-size: clamp(36px, 5vw, 66px); line-height: 1.14; font-weight: 850; }
.story-copy { font-size: 18px; }
.story-copy > p:first-child { margin-top: 0; }
blockquote { margin: 34px 0 0; padding: 20px 0 20px 24px; border-left: 4px solid var(--red); font-size: 21px; font-weight: 700; }
kbd { min-width: 30px; min-height: 30px; display: inline-grid; place-items: center; padding: 0 8px; border: 1px solid #bbb5aa; border-bottom-width: 3px; background: #fff; font: 700 14px/1 system-ui, sans-serif; }

.section-dark { color: #fff; background: var(--dark); }
.section-heading { display: grid; grid-template-columns: 1.6fr .8fr; gap: 8vw; align-items: end; margin-bottom: 64px; }
.section-heading > p { margin: 0; color: var(--muted); font-size: 18px; }
.section-heading.light > p { color: #b8bebf; }
.workflow-list { list-style: none; display: grid; grid-template-columns: repeat(4, 1fr); gap: 0; margin: 0; padding: 0; border-top: 1px solid #4f5658; }
.workflow-list li { min-height: 225px; padding: 28px 24px 20px 0; border-right: 1px solid #4f5658; }
.workflow-list li + li { padding-left: 24px; }
.workflow-list li:last-child { border-right: 0; }
.workflow-list span { display: block; color: #7e8586; font: 700 13px/1 system-ui, sans-serif; }
.workflow-list strong { display: block; margin-top: 42px; font-size: 29px; }
.workflow-list p { margin: 8px 0 0; color: #b8bebf; }

.canvas-showcase { background: var(--paper-bright); }
.showcase-grid { display: grid; grid-template-columns: .72fr 1.28fr; gap: 7vw; align-items: center; }
.showcase-copy > p:not(.section-kicker) { max-width: 510px; color: var(--muted); font-size: 18px; }
.key-row { display: grid; grid-template-columns: repeat(3, 1fr); gap: 10px; margin-top: 30px; }
.key-row > div { padding: 14px 10px; border-top: 2px solid var(--ink); }
.key-row span { display: block; margin-top: 9px; font-size: 12px; }
.product-shot { margin: 0; border: 1px solid var(--line); background: #fff; box-shadow: 16px 16px 0 #e7e3d9; }
.product-shot img { width: 100%; aspect-ratio: 4 / 3; object-fit: cover; object-position: center; }
.wide-shot img { aspect-ratio: 16 / 10; }
.product-shot figcaption { padding: 12px 14px; border-top: 1px solid var(--line); color: var(--muted); font-size: 12px; }
.ocr-shot img { height: auto; aspect-ratio: auto; object-fit: contain; }

.features { background: var(--paper); }
.feature-grid { display: grid; grid-template-columns: repeat(3, 1fr); border-top: 1px solid var(--line); border-left: 1px solid var(--line); }
.feature-grid article { min-height: 240px; padding: 28px; border-right: 1px solid var(--line); border-bottom: 1px solid var(--line); background: rgba(255,255,255,.36); }
.feature-grid article.pro-feature { background: var(--blue-soft); }
.feature-index { color: var(--red); font: 800 12px/1 system-ui, sans-serif; }
.pro-feature .feature-index { color: var(--blue); }
.feature-grid h3 { margin: 50px 0 8px; font-size: 23px; }
.feature-grid p { margin: 0; color: var(--muted); }

.intelligence { background: var(--paper-bright); }
.intelligence-grid { display: grid; grid-template-columns: minmax(0, 1fr) minmax(340px, .82fr); gap: 72px; align-items: center; }
.intelligence-copy { padding: 30px 0; }
.intelligence-copy > p:not(.section-kicker) { color: var(--muted); font-size: 18px; }
.pro-pill { display: inline-flex; margin-bottom: 24px; padding: 5px 10px; border: 1px solid var(--blue); color: var(--blue); font-size: 12px; font-weight: 800; }
.check-list { list-style: none; margin: 28px 0 0; padding: 0; }
.check-list li { padding: 10px 0 10px 25px; border-bottom: 1px solid var(--line); position: relative; }
.check-list li::before { content: "✓"; position: absolute; left: 0; color: var(--blue); font-weight: 900; }
.privacy { color: #fff; background: var(--blue); }
.privacy .section-kicker { color: #d7edfa; }
.privacy-grid { display: grid; grid-template-columns: .8fr 1.2fr; gap: 9vw; }
.privacy-items { border-top: 1px solid rgba(255,255,255,.38); }
.privacy-items article { display: grid; grid-template-columns: 170px 1fr; gap: 30px; padding: 24px 0; border-bottom: 1px solid rgba(255,255,255,.38); }
.privacy-items h3, .privacy-items p { margin: 0; }
.privacy-items p { color: #e1eff8; }

.final-cta { text-align: center; background: var(--paper); }
.final-inner { display: flex; flex-direction: column; align-items: center; }
.final-inner img { margin-bottom: 18px; border-radius: 8px; }
.final-inner h2 { max-width: 800px; }
.hero-actions.centered { justify-content: center; }
.release-note { margin: 18px 0 0; color: var(--muted); font-size: 13px; }

.site-footer { min-height: 96px; display: flex; justify-content: space-between; align-items: center; gap: 30px; padding: 20px max(24px, calc((100vw - var(--max)) / 2)); border-top: 1px solid var(--line); font-size: 13px; }
.site-footer > div { display: flex; align-items: center; gap: 22px; }
.site-footer span { color: var(--muted); }

*:focus-visible { outline: 3px solid var(--red); outline-offset: 3px; }

@media (max-width: 900px) {
  .site-header { grid-template-columns: 1fr auto; }
  .desktop-nav { display: none; }
  .hero { padding-top: 100px; }
  .hero-layout { grid-template-columns: 1fr; gap: 46px; }
  .hero-content { max-width: 680px; }
  .story-grid, .showcase-grid, .privacy-grid, .intelligence-grid { grid-template-columns: 1fr; gap: 48px; }
  .section-heading { grid-template-columns: 1fr; gap: 22px; }
  .workflow-list { grid-template-columns: repeat(2, 1fr); }
  .workflow-list li:nth-child(2) { border-right: 0; }
  .workflow-list li:nth-child(n+3) { border-top: 1px solid #4f5658; }
  .feature-grid { grid-template-columns: repeat(2, 1fr); }
  .privacy-items article { grid-template-columns: 140px 1fr; }
}

@media (max-width: 600px) {
  .site-header { height: 60px; padding: 0 16px; }
  .brand span { display: none; }
  .header-download { min-height: 36px; padding: 0 12px; font-size: 12px; }
  .hero { min-height: auto; padding: 96px 16px 72px; align-items: flex-start; }
  .hero-layout { gap: 34px; }
  .hero-content { width: 100%; }
  h1 { font-size: 46px; }
  .hero-lead { margin-top: 20px; font-size: 24px; }
  .hero-actions { gap: 8px; margin-top: 25px; }
  .button { width: 100%; min-height: 48px; }
  .hero-meta { font-size: 11px; }
  .hero-next { display: none; }
  .hero-visual { box-shadow: 8px 8px 0 #e7e3d9; }
  .section { padding: 78px 16px; }
  h2 { font-size: 36px; }
  .story-copy { font-size: 16px; }
  blockquote { font-size: 18px; }
  .workflow-list { grid-template-columns: 1fr; }
  .workflow-list li, .workflow-list li + li { min-height: 0; padding: 24px 0; border-right: 0; border-top: 1px solid #4f5658; }
  .workflow-list li:first-child { border-top: 0; }
  .workflow-list strong { margin-top: 18px; }
  .key-row { grid-template-columns: 1fr; }
  .key-row > div { display: flex; align-items: center; gap: 14px; }
  .key-row span { margin: 0; }
  .feature-grid { grid-template-columns: 1fr; }
  .feature-grid article { min-height: 205px; padding: 24px; }
  .feature-grid h3 { margin-top: 35px; }
  .product-shot { box-shadow: 8px 8px 0 #e7e3d9; }
  .privacy-items article { grid-template-columns: 1fr; gap: 6px; }
  .site-footer, .site-footer > div { flex-direction: column; align-items: flex-start; }
  .site-footer { padding: 28px 16px; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition-duration: .01ms !important; }
}