:root {
  color-scheme: light;
  --paper: #f3efe5;
  --paper-light: #faf8f2;
  --ink: #22251f;
  --muted: #63675d;
  --green: #4f5b46;
  --gold: #776a42;
  --line: #d6d1c4;
  --serif: "Songti SC", STSong, "Noto Serif SC", "Source Han Serif SC", SimSun, Georgia, serif;
  --sans: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", sans-serif;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 28px; }
body { margin: 0; background: var(--paper); color: var(--ink); font-family: var(--sans); -webkit-font-smoothing: antialiased; }
body:has(.image-viewer[open]) { overflow: hidden; }
::selection { background: #ded7b9; }
a { color: inherit; text-underline-offset: 5px; }
button, a, summary { -webkit-tap-highlight-color: #d6d1c4; touch-action: manipulation; }
button { font: inherit; }
img { display: block; max-width: 100%; height: auto; }
a:focus-visible, button:focus-visible, summary:focus-visible, [tabindex]:focus-visible { outline: 2px solid var(--green); outline-offset: 5px; }
p { margin: 0; line-height: 1.9; text-wrap: pretty; }
h1, h2, h3 { font-family: var(--serif); font-weight: 500; margin: 0; text-wrap: balance; }
h1 { font-size: clamp(42px, 5.7vw, 84px); line-height: 1.2; letter-spacing: -.045em; }
h2 { font-size: clamp(34px, 3.8vw, 52px); line-height: 1.3; letter-spacing: -.035em; }
h3 { font-size: 24px; line-height: 1.4; }
figure { margin: 0; }
.shell { width: min(1280px, calc(100% - 112px)); margin-inline: auto; }
.section-space { padding-block: 100px; }
.skip-link { position: fixed; z-index: 10; top: 12px; left: 12px; padding: 12px 20px; background: var(--ink); color: var(--paper); transform: translateY(-160%); }
.skip-link:focus { transform: translateY(0); }
.site-header { display: flex; align-items: center; justify-content: space-between; gap: 24px; min-height: 104px; border-bottom: 1px solid var(--line); }
.brand { display: flex; align-items: center; gap: 11px; text-decoration: none; flex-shrink: 0; min-height: 44px; }
.brand > span { font-family: var(--serif); font-size: 21px; line-height: 1.2; }
.brand small { display: block; font-family: Georgia, serif; font-size: 11px; margin-top: 5px; letter-spacing: .06em; color: var(--muted); }
.site-header nav { display: flex; align-items: center; gap: 32px; font-size: 14px; }
.site-header nav a { display: inline-flex; align-items: center; min-height: 44px; text-decoration: none; padding-block: 14px; }
.site-header nav a:hover, .site-footer a:hover { color: var(--green); text-decoration: underline; }
.site-header .lab-link { margin-left: 18px; color: var(--muted); }
.hero { padding-top: 72px; }
.hero-heading { display: grid; grid-template-columns: 1.65fr 1fr; gap: 36px; align-items: end; margin-bottom: 58px; }
.product-line { margin-bottom: 22px; font-size: 13px; color: var(--muted); }
.hero-intro { padding-bottom: 7px; }
.hero-intro > p:first-child { font-family: var(--serif); font-size: clamp(18px, 1.65vw, 23px); line-height: 1.8; }
.actions { display: flex; align-items: center; gap: 24px; flex-wrap: wrap; margin-top: 28px; }
.button { display: inline-flex; align-items: center; justify-content: center; gap: 9px; min-height: 48px; padding: 13px 20px; text-decoration: none; font-size: 14px; line-height: 1.5; border: 1px solid transparent; border-radius: 3px; transition: background-color 160ms ease; }
.button-primary { background: var(--green); color: var(--paper-light); }
.button-primary:hover { background: #35422e; }
.button-primary img { filter: brightness(0) invert(1); }
.text-link { display: inline-flex; gap: 10px; align-items: center; min-height: 44px; padding-block: 10px; font-size: 14px; text-decoration: underline; text-decoration-color: #aaa58f; }
.text-link:hover { text-decoration-color: currentColor; color: var(--green); }
.platform-note, .download-meta { margin-top: 16px; font-size: 11px; color: var(--muted); }
.hero-figure { padding: 14px 14px 0; background: #dce0d4; border: 1px solid #c9cebe; border-radius: 9px; }
.screenshot { position: relative; display: block; text-decoration: none; }
.screenshot > img { width: 100%; background: white; border: 1px solid #d9d8cf; border-radius: 3px; }
.hero-figure .screenshot > img { box-shadow: 0 4px 28px #26331a0d; }
.image-action { position: absolute; right: 12px; bottom: 12px; display: flex; align-items: center; gap: 6px; padding: 9px 12px; border-radius: 3px; background: var(--paper-light); border: 1px solid var(--line); color: var(--ink); font-size: 11px; opacity: 0; transition: opacity 140ms ease; }
.screenshot:hover .image-action, .screenshot:focus-visible .image-action { opacity: 1; }
figcaption { display: flex; justify-content: space-between; gap: 16px; padding-block: 14px; color: var(--muted); font-size: 11px; line-height: 1.7; }
.hero-figure figcaption { padding-inline: 3px; }
.section-heading { display: grid; grid-template-columns: 1fr 1fr; gap: 72px; align-items: end; }
.section-heading > p { max-width: 390px; justify-self: end; font-size: 16px; color: var(--muted); padding-bottom: 4px; }
.reading-features { display: grid; grid-template-columns: repeat(3, 1fr); gap: 48px; margin-top: 52px; }
.reading-features article { border-top: 1px solid var(--line); padding-top: 25px; }
.feature-icon { margin-bottom: 20px; }
.reading-features h3 { margin-bottom: 12px; }
.reading-features p { font-size: 14px; color: var(--muted); }
.collection { background: var(--paper-light); }
.feature-section { display: grid; grid-template-columns: .85fr 1.4fr; align-items: center; gap: 64px; }
.feature-section + .feature-section { border-top: 1px solid var(--line); }
.feature-copy { min-width: 0; }
.section-label { font-size: 13px; color: var(--gold); margin-bottom: 20px; }
.feature-copy h2 { font-size: clamp(32px, 3.15vw, 44px); margin-bottom: 24px; }
.feature-copy > p:not(.section-label) { font-size: 15px; color: var(--muted); max-width: 370px; }
.feature-list { list-style: none; margin: 24px 0 0; padding: 0; }
.feature-list li { position: relative; padding-left: 17px; margin-bottom: 11px; font-size: 12px; color: var(--muted); line-height: 1.8; }
.feature-list li::before { content: ""; position: absolute; left: 0; top: .75em; width: 5px; height: 5px; background: var(--gold); border-radius: 50%; }
.detail-figure { min-width: 0; }
.detail-figure .screenshot { padding: 10px; background: #efeee6; border: 1px solid #e3e0d4; border-radius: 5px; }
.detail-figure figcaption { padding-bottom: 0; }
.feature-reverse { grid-template-columns: 1.4fr .85fr; }
.feature-reverse .feature-copy { grid-column: 2; grid-row: 1; }
.feature-reverse .product-figure { grid-column: 1; grid-row: 1; }
.ownership { background: #e4e7dc; }
.ownership-layout { display: grid; grid-template-columns: 1fr 1fr; gap: 100px; }
.ownership h2 { font-size: clamp(40px, 4.2vw, 60px); line-height: 1.45; }
.ownership .section-label { color: var(--green); }
.ownership-points article { padding: 25px 0; border-top: 1px solid #c9cebe; }
.ownership-points article:first-child { padding-top: 0; border-top: 0; }
.ownership-points h3 { font-size: 23px; margin-bottom: 10px; }
.ownership-points p { font-size: 14px; color: #555e4d; }
.download-section { display: grid; grid-template-columns: 1.2fr 1fr; gap: 100px; align-items: center; }
.download-copy > p:not(.section-label):not(.download-meta) { font-family: var(--serif); font-size: 20px; margin-top: 22px; }
.download-details { border-left: 1px solid var(--line); padding-left: 40px; }
.download-details h3 { margin-bottom: 20px; }
.download-details p { color: var(--muted); font-size: 13px; margin-bottom: 20px; }
.download-details a:hover { color: var(--ink); }
.source-link { font-size: 13px; }
.faq { display: grid; grid-template-columns: 1fr 1.4fr; gap: 64px; border-top: 1px solid var(--line); padding-top: 60px; }
.faq h2 { font-size: 32px; }
.faq details { border-bottom: 1px solid var(--line); }
.faq summary { display: flex; align-items: center; justify-content: space-between; gap: 20px; list-style: none; cursor: pointer; font-size: 15px; line-height: 1.6; padding: 22px 0; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: "+"; flex-shrink: 0; font-size: 23px; font-family: var(--serif); color: var(--green); }
.faq details[open] summary::after { content: "−"; }
.faq summary:hover { color: var(--green); }
.faq details p { font-size: 14px; color: var(--muted); padding: 0 30px 24px 0; }
.site-footer { display: grid; grid-template-columns: 1fr auto; align-items: start; gap: 28px; border-top: 1px solid var(--line); padding-block: 38px 30px; }
.footer-brand { font-family: var(--serif); font-size: 19px; text-decoration: none; }
.footer-brand span { font-size: 13px; margin-left: 10px; color: var(--muted); }
.site-footer p { color: var(--muted); font-family: var(--serif); font-size: 14px; margin-top: 12px; }
.site-footer nav { display: flex; gap: 25px; font-size: 12px; }
.site-footer nav a { padding-block: 10px; text-decoration: none; }
.site-footer .company-name { grid-column: 1 / -1; font-family: var(--sans); font-size: 11px; margin: 0; }
.image-viewer { width: min(1440px, calc(100% - 48px)); max-width: none; max-height: calc(100dvh - 48px); padding: 20px; background: var(--paper-light); color: var(--ink); border: 1px solid var(--line); border-radius: 6px; }
.image-viewer::backdrop { background: #1c251ac9; backdrop-filter: blur(5px); }
.viewer-bar { display: flex; align-items: center; justify-content: space-between; gap: 20px; margin-bottom: 16px; }
.viewer-bar h2 { font-family: var(--sans); font-size: 15px; letter-spacing: 0; }
.viewer-close { border: 1px solid var(--line); color: var(--ink); background: var(--paper); border-radius: 2px; min-height: 44px; padding: 8px 14px; cursor: pointer; font-size: 13px; }
.viewer-close:hover { background: #e4e7dc; }
.viewer-close span { margin-left: 8px; }
.viewer-image { width: 100%; }
.viewer-canvas { max-height: 70dvh; overflow: auto; overscroll-behavior: contain; }
.mobile-hint { display: none; }
.viewer-caption { margin-top: 12px; font-size: 11px; color: var(--muted); }
@media (hover: none) { .image-action { opacity: 1; } }
@media (min-width: 1600px) { .hero-heading { grid-template-columns: 1.6fr 1fr; } }
@media (max-width: 1100px) {
  .shell { width: calc(100% - 72px); }
  .hero-heading { grid-template-columns: 1fr; gap: 30px; }
  .hero-intro { display: grid; grid-template-columns: 1fr 1fr; align-items: center; gap: 0 30px; }
  .hero-intro .actions { margin-top: 0; justify-content: flex-end; gap: 18px; }
  .hero-intro .platform-note { grid-column: 2; margin-top: 8px; text-align: right; }
  .feature-section { gap: 36px; }
  .ownership-layout, .download-section { gap: 60px; }
}
@media (max-width: 760px) {
  .shell { width: calc(100% - 40px); }
  .section-space { padding-block: 64px; }
  .site-header { min-height: 84px; gap: 16px; }
  .brand > img { width: 32px; height: 32px; }
  .brand { gap: 7px; }
  .brand > span { font-size: 18px; }
  .brand small { font-size: 9px; }
  .site-header nav { gap: 18px; font-size: 12px; }
  .site-header .lab-link { display: none; }
  .hero { padding-top: 46px; }
  h1 { font-size: clamp(35px, 6.8vw, 49px); line-height: 1.3; }
  .product-line { font-size: 12px; margin-bottom: 20px; }
  .hero-heading { gap: 24px; margin-bottom: 32px; }
  .hero-intro { display: block; padding: 0; }
  .hero-intro > p:first-child { font-size: 18px; }
  .hero-intro .actions { justify-content: flex-start; margin-top: 24px; gap: 22px; }
  .hero-intro .platform-note { text-align: left; margin-top: 13px; font-size: 10px; }
  .hero-figure { padding: 6px 6px 0; border-radius: 5px; }
  .hero-figure figcaption { display: block; padding: 10px 5px; font-size: 10px; }
  .hero-figure figcaption span { display: block; }
  .hero-figure figcaption span + span { margin-top: 3px; }
  .image-action { right: 8px; bottom: 8px; padding: 5px 7px; font-size: 10px; opacity: 1; }
  .image-action img { width: 12px; height: 12px; }
  .section-heading { grid-template-columns: 1fr; gap: 22px; }
  .section-heading > p { justify-self: start; font-size: 14px; max-width: 430px; }
  .reading-features { grid-template-columns: 1fr; margin-top: 32px; gap: 28px; }
  .reading-features article { position: relative; padding: 24px 0 0 44px; }
  .feature-icon { position: absolute; left: 0; top: 26px; width: 22px; height: 22px; }
  .reading-features h3 { font-size: 23px; margin-bottom: 9px; }
  .reading-features p { font-size: 14px; }
  .feature-section, .feature-reverse { grid-template-columns: 1fr; gap: 30px; }
  .feature-reverse .feature-copy, .feature-reverse .product-figure { grid-column: auto; grid-row: auto; }
  .feature-copy h2 { font-size: 36px; margin-bottom: 20px; }
  .section-label { font-size: 12px; margin-bottom: 16px; }
  .feature-copy > p:not(.section-label) { font-size: 14px; max-width: 480px; }
  .feature-list { margin-top: 20px; }
  .feature-list li { font-size: 12px; }
  .detail-figure .screenshot { padding: 6px; }
  .detail-figure figcaption { font-size: 10px; }
  .ownership-layout, .download-section { grid-template-columns: 1fr; gap: 36px; }
  .ownership h2 { font-size: 42px; line-height: 1.35; }
  .ownership-points article { padding-block: 22px; }
  .ownership-points article:first-child { padding-top: 22px; border-top: 1px solid #c9cebe; }
  .download-copy > p:not(.section-label):not(.download-meta) { font-size: 18px; }
  .download-details { border-left: 0; border-top: 1px solid var(--line); padding: 28px 0 0; }
  .download-details p { font-size: 13px; }
  .faq { grid-template-columns: 1fr; gap: 20px; }
  .faq h2 { font-size: 30px; }
  .faq details p { padding-right: 0; }
  .site-footer { grid-template-columns: 1fr; gap: 18px; }
  .site-footer nav { gap: 28px; }
  .site-footer .company-name { grid-column: auto; }
  .image-viewer { width: calc(100% - 20px); max-height: calc(100dvh - 20px); padding: 12px; }
  .viewer-bar { gap: 12px; }
  .viewer-bar h2 { font-size: 13px; line-height: 1.6; }
  .viewer-close { white-space: nowrap; }
  .viewer-caption { font-size: 10px; }
  .viewer-image { min-width: 800px; max-width: none; }
  .mobile-hint { display: block; }
}
@media (max-width: 370px) {
  .shell { width: calc(100% - 32px); }
  .site-header nav { gap: 12px; font-size: 11px; }
  .brand > img { width: 28px; height: 28px; }
  .brand > span { font-size: 16px; }
  h1 { font-size: 32px; }
  .actions { gap: 16px; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition: none; }
}