:root {
  --ink: #2c363b;
  --muted: #706f68;
  --blue: #486d89;
  --line: #c9c2b1;
  --paper: #f8f3e8;
  --ochre: #e7c77d;
  --hand: "Kaiti SC", "KaiTi", "STKaiti", "FangSong", Georgia, serif;
  font-family: "Segoe UI", "Microsoft YaHei", system-ui, sans-serif;
  color: var(--ink);
  background: var(--paper);
  font-synthesis: none;
  scroll-behavior: smooth;
  scroll-padding-top: 40px;
}
* { box-sizing: border-box; }
body { margin: 0; }
a { color: inherit; text-decoration: none; }
button { font: inherit; cursor: pointer; }
a, button { touch-action: manipulation; }
a:focus-visible, button:focus-visible, summary:focus-visible { outline: 2px dashed var(--blue); outline-offset: 5px; }
p { line-height: 1.95; }
h1, h2, h3, p, figure { margin: 0; }
h1, h2 { font-family: var(--hand); font-weight: 500; }
h2 { font-size: clamp(30px, 3.2vw, 42px); line-height: 1.55; letter-spacing: .015em; margin-bottom: 20px; }
h3 { font-size: 19px; font-weight: 600; }
.wrap { max-width: 1180px; margin-inline: auto; padding-inline: 32px; }
.section { padding-block: 90px; }
.skip { position: fixed; top: -70px; left: 20px; background: var(--paper); z-index: 100; padding: 12px; }
.skip:focus { top: 10px; }
.header { max-width: 1240px; margin: auto; display: flex; align-items: center; justify-content: space-between; padding: 29px 32px; gap: 28px; }
.brand { display: block; flex-shrink: 0; line-height: 1; }
.brand img { display: block; width: 157px; height: auto; mix-blend-mode: multiply; }
.brand.small img { width: 128px; }
nav { display: flex; align-items: center; gap: 32px; font-size: 14px; }
nav a { position: relative; }
nav a:not(.nav-download):hover::after { content: ''; position: absolute; left: 0; right: 0; bottom: -6px; border-bottom: 1.5px solid var(--blue); transform: rotate(-2deg); }
.nav-download { border: 1.3px solid var(--ink); padding: 9px 18px; border-radius: 4px 8px 5px 3px / 5px 3px 7px 8px; }
.nav-download span { margin-left: 18px; }
.nav-download:hover { background: #eee6d5; }
.hero { padding-block: 54px 70px; display: grid; grid-template-columns: .91fr 1.09fr; gap: 15px; align-items: center; }
.hero-copy { position: relative; z-index: 1; }
.eyebrow { display: flex; align-items: center; gap: 10px; font-family: var(--hand); font-size: 17px; color: var(--blue); margin-bottom: 24px; font-weight: 500; letter-spacing: .03em; }
.pencil-stroke { display: inline-block; height: 15px; width: 23px; border-bottom: 3px solid var(--blue); transform: rotate(-15deg); border-radius: 45%; }
.hero h1 { font-size: clamp(48px, 5vw, 68px); letter-spacing: .025em; line-height: 1.4; margin-bottom: 20px; }
.blue { color: var(--blue); position: relative; display: inline-block; }
.blue::after { content: ''; position: absolute; left: 0; right: 6px; bottom: 2px; height: 7px; border-top: 2px solid var(--blue); border-bottom: 1px solid #486d8980; border-radius: 50%; transform: rotate(-2deg); }
.lead { font-family: var(--hand); font-size: 23px; color: #424d52; line-height: 1.8; margin-bottom: 18px; }
.hero-detail { font-size: 14px; color: var(--muted); max-width: 420px; margin-bottom: 28px; }
.actions { display: flex; align-items: center; gap: 26px; flex-wrap: wrap; }
.button { display: inline-flex; gap: 25px; align-items: center; justify-content: center; border: 1.5px solid var(--ink); border-radius: 5px 9px 4px 7px / 8px 4px 9px 3px; padding: 14px 24px; font-size: 14px; font-weight: 500; transition: transform .15s, background .15s; }
.primary { background: var(--blue); color: #fffdf5; box-shadow: 3px 4px 0 #c9c2b1; }
.primary:hover { background: #375970; transform: translateY(-1px); }
.text-link { font-size: 14px; display: inline-flex; gap: 15px; align-items: center; text-decoration: underline; text-decoration-color: #8b9ba5; text-underline-offset: 6px; text-decoration-thickness: 1px; }
.text-link:hover { color: var(--blue); text-decoration-color: var(--blue); }
.fine { font-size: 12px; color: var(--muted); line-height: 1.85; }
.hero .fine { margin-top: 18px; }
.hero-illustration { align-self: center; padding-top: 18px; }
.hero-illustration img, .rest-illustration img { width: 100%; height: auto; display: block; }
.hero-illustration figcaption { display: flex; align-items: center; justify-content: center; gap: 12px; font-family: var(--hand); font-size: 18px; color: var(--blue); transform: rotate(-2deg); margin-top: 5px; }
.hero-illustration figcaption svg { width: 72px; height: 32px; fill: none; stroke: var(--blue); stroke-width: 1.5; stroke-linecap: round; stroke-linejoin: round; }
.section-top { display: flex; align-items: center; justify-content: space-between; gap: 20px; margin-bottom: 22px; }
.section-top .eyebrow { margin: 0; }
.section-top .fine a { margin-left: 10px; text-decoration: underline; text-underline-offset: 4px; }
.sketch-number { border: 1.2px solid var(--blue); border-radius: 47% 54% 42% 53%; display: inline-flex; align-items: center; justify-content: center; width: 32px; height: 30px; font-size: 16px; flex-shrink: 0; transform: rotate(-6deg); }
/* The app itself retains its real styles and proportions, inside its own document. */
.app-frame { position: relative; width: 100%; aspect-ratio: 1600/960; overflow: hidden; border: 1px solid #868a88; border-radius: 7px; background: #e4e3e0; box-shadow: 5px 7px 0 #d8d0be80; }
.app-frame iframe { position: absolute; left: 0; top: 0; width: 1600px; height: 960px; border: 0; display: block; transform-origin: 0 0; }
.preview-caption { font-family: var(--hand); font-size: 17px; color: var(--muted); text-align: center; margin-top: 23px; }
.features, .data-section, .faq-section { display: grid; grid-template-columns: .85fr 1.15fr; gap: 90px; }
.section-heading > p:last-child:not(.eyebrow) { font-size: 14px; color: var(--muted); max-width: 340px; }
.margin-drawing { width: 165px; height: 105px; margin: 32px 0 0 18px; fill: none; stroke: var(--ink); stroke-width: 1.4; stroke-linecap: round; stroke-linejoin: round; transform: rotate(-3deg); }
.blue-ink { stroke: var(--blue); stroke-width: 2; }
.feature-list article { display: grid; grid-template-columns: 30px 1fr; gap: 16px; padding-block: 26px; border-top: 1px solid var(--line); }
.feature-list article:last-child { padding-bottom: 0; }
.feature-no { font-family: var(--hand); font-size: 22px; color: var(--blue); line-height: 30px; transform: rotate(-7deg); }
.feature-title { display: flex; gap: 15px; align-items: center; flex-wrap: wrap; }
.feature-title h3 { font-family: var(--hand); font-size: 23px; font-weight: 500; }
.tag { display: inline-block; color: #777467; padding: 3px 8px; font-size: 10px; border: 1px solid #b5af9f; border-radius: 3px 5px 2px 6px; background: transparent; white-space: nowrap; }
.tag.purple { color: var(--blue); border-color: #9aaeb7; }
.feature-list p { font-size: 14px; color: var(--muted); margin-block: 13px; }
.chips { display: flex; gap: 15px; flex-wrap: wrap; font-size: 11px; color: var(--blue); }
.chips span { border-bottom: 1px solid #aab7b8; padding-bottom: 3px; }
.workflow { position: relative; border-block: 1px dashed var(--line); background: #eee7d533; }
.workflow .section-heading { max-width: 640px; }
.workflow .section-heading > p:last-child { max-width: none; }
.steps { list-style: none; padding: 0; display: grid; grid-template-columns: repeat(4,1fr); gap: 34px; margin: 44px 0 34px; }
.steps li { position: relative; padding: 22px 0 0; border-top: 1px solid #8a9a9f; }
.steps li::before { content: ''; position: absolute; left: -1px; right: 6px; top: -4px; border-top: 1px solid #8a9a9f80; transform: rotate(.7deg); }
.steps li:nth-child(even)::before { transform: rotate(-.7deg); }
.steps li > span { color: var(--blue); font-family: var(--hand); font-size: 18px; }
.steps h3 { font-size: 17px; margin: 18px 0 12px; font-weight: 500; }
.steps p { font-size: 13px; color: var(--muted); }
.bridge-note { display: flex; align-items: center; gap: 20px; padding: 18px 0; border-top: 1px dotted var(--line); }
.bridge-note > span:first-child { font-family: var(--hand); font-size: 36px; color: var(--blue); }
.bridge-note p { font-size: 12px; color: var(--muted); flex: 1; }
.bridge-note strong { font-size: 14px; color: var(--ink); font-weight: 500; }
.data-content article { display: flex; gap: 20px; padding: 25px 0; border-top: 1px solid var(--line); }
.data-icon { width: 30px; flex: none; font-family: var(--hand); font-size: 32px; color: var(--blue); }
.purple-text { color: #9b7547; }
.data-content h3 { font-size: 18px; margin-bottom: 12px; font-weight: 500; }
.data-content p { font-size: 14px; color: var(--muted); }
.data-content .data-footnote { font-size: 12px; border-left: 2px solid #caa766; padding: 3px 0 3px 15px; }
.download-section { border-block: 1px dashed var(--line); background: #e9eef03d; }
.download-grid { display: grid; grid-template-columns: 1.1fr .9fr; gap: 100px; align-items: center; }
.download-intro { font-size: 14px; color: var(--muted); margin: 20px 0 25px; }
.release-meta { font-size: 12px; color: var(--blue); margin-top: 18px; min-height: 23px; }
.download-grid .fine { max-width: 410px; margin-top: 12px; }
.fine a { color: var(--blue); text-decoration: underline; text-underline-offset: 4px; }
.release-card { position: relative; background: #fffdf6; border: 1.3px solid #8d938d; border-radius: 3px 7px 5px 2px; padding: 30px; box-shadow: 4px 5px 0 #d9d0bc80; transform: rotate(.7deg); }
.release-card::before { content: ''; position: absolute; top: -6px; left: 28px; width: 37px; height: 12px; border-top: 2px solid #b99c5d; border-bottom: 1px solid #d9bf85; transform: rotate(-3deg); }
.release-card-heading { display: flex; justify-content: space-between; gap: 15px; align-items: center; }
.release-card h3 { font-family: var(--hand); font-size: 24px; font-weight: 500; }
.release-date { font-family: var(--hand); font-size: 16px; color: var(--muted); margin-top: 13px; }
.release-card ul { padding-left: 18px; margin-block: 24px; font-size: 13px; color: #596569; line-height: 1.9; }
.release-card li + li { margin-top: 10px; }
.release-card li::marker { color: var(--blue); }
.checksum { border-top: 1px dashed var(--line); font-size: 11px; padding-top: 15px; color: var(--muted); }
.checksum summary { cursor: pointer; }
.checksum code { display: block; overflow-wrap: anywhere; line-height: 1.8; margin-top: 14px; }
.release-card .fine { font-size: 10px; margin: 17px 0 0; }
.faq details { border-top: 1px solid var(--line); padding-block: 23px; }
.faq details:last-child { border-bottom: 1px solid var(--line); }
.faq summary { cursor: pointer; list-style: none; display: flex; justify-content: space-between; gap: 15px; font-size: 15px; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary::after { content: '+'; font-family: var(--hand); font-size: 22px; color: var(--blue); line-height: 20px; }
.faq details[open] summary::after { content: '−'; }
.faq p { font-size: 13px; color: var(--muted); margin-top: 16px; }
.contact { display: grid; grid-template-columns: 1.1fr .9fr; gap: 65px; align-items: center; padding-block: 25px 65px; }
.rest-illustration figcaption { text-align: center; color: var(--muted); font-family: var(--hand); font-size: 17px; margin-top: 12px; }
.contact .eyebrow { margin-bottom: 20px; }
.contact h2 { font-size: 36px; margin-bottom: 18px; }
.contact-copy > p:not(.eyebrow) { font-size: 13px; color: var(--muted); max-width: 360px; margin-bottom: 25px; }
.contact .text-link { color: var(--blue); }
.footer { display: flex; align-items: center; gap: 25px; border-top: 1px solid var(--line); padding-block: 30px; font-size: 11px; color: var(--muted); }
.footer p { margin-right: auto; font-family: var(--hand); font-size: 16px; }
.footer > span { font-size: 10px; }
.footer a:hover { color: var(--blue); }
@media (min-width:1450px) { .hero { padding-top: 65px; padding-bottom: 80px; } }
@media (max-width:1000px) {
  .hero { gap: 15px; grid-template-columns: 1fr 1fr; }
  .hero h1 { font-size: 55px; }
  .lead { font-size: 21px; }
  .hero-detail { font-size: 13px; }
  .hero-illustration figcaption { font-size: 16px; }
  .features, .data-section, .faq-section { gap: 42px; }
  .download-grid, .contact { gap: 40px; }
  .wrap, .header { padding-inline: 26px; }
  .section { padding-block: 75px; }
}
@media (max-width:740px) {
  .header { padding: 24px 22px; gap: 15px; }
  .brand img { width: 130px; }
  .brand.small img { width: 118px; }
  nav { gap: 18px; font-size: 12px; }
  nav a:nth-child(3) { display: none; }
  .nav-download { padding: 8px 12px; }
  .nav-download span { margin-left: 5px; }
  .wrap { padding-inline: 22px; }
  .hero { grid-template-columns: 1fr; padding-block: 30px 42px; gap: 22px; }
  .hero h1 { font-size: 50px; line-height: 1.45; margin-bottom: 18px; }
  .hero .eyebrow { font-size: 16px; margin-bottom: 22px; }
  .lead { font-size: 21px; margin-bottom: 14px; }
  .hero-detail { font-size: 13px; margin-bottom: 25px; max-width: none; }
  .hero .actions { gap: 22px; }
  .hero .fine { font-size: 10px; }
  .hero-illustration { padding: 0; max-width: 520px; margin: 0 auto; width: 100%; }
  .hero-illustration figcaption { font-size: 17px; }
  .hero-illustration figcaption svg { width: 57px; }
  .section-top { align-items: flex-start; flex-direction: column; gap: 12px; margin-bottom: 17px; }
  .section-top .eyebrow { font-size: 16px; }
  .section-top .fine { font-size: 10px; line-height: 1.8; }
  .app-frame { border-radius: 5px; box-shadow: 3px 4px 0 #d8d0be80; }
  .preview-caption { font-size: 15px; text-align: left; margin-top: 20px; }
  .section { padding-block: 55px; }
  .features, .data-section, .faq-section, .download-grid { grid-template-columns: 1fr; gap: 23px; }
  h2 { font-size: 32px; margin-bottom: 14px; }
  .section-heading .eyebrow { margin-bottom: 17px; }
  .section-heading > p:last-child:not(.eyebrow) { font-size: 13px; }
  .margin-drawing { width: 125px; height: 80px; margin: 16px 0 0; }
  .feature-list article { padding-block: 23px; gap: 12px; }
  .feature-title { gap: 10px; }
  .feature-title h3 { font-size: 23px; }
  .feature-list p, .data-content p { font-size: 13px; }
  .steps { grid-template-columns: 1fr 1fr; gap: 24px; margin-top: 32px; }
  .steps li { padding-top: 15px; }
  .steps h3 { font-size: 15px; margin: 13px 0 10px; }
  .steps p { font-size: 12px; }
  .bridge-note { padding: 15px 0; gap: 12px; align-items: flex-start; }
  .bridge-note > .tag { display: none; }
  .download-grid { gap: 35px; }
  .download-intro { font-size: 13px; }
  .release-card { padding: 24px; transform: rotate(.35deg); }
  .data-content article { padding-block: 21px; }
  .contact { grid-template-columns: 1fr; padding-block: 5px 45px; gap: 30px; }
  .rest-illustration { max-width: 520px; margin: auto; }
  .rest-illustration figcaption { font-size: 16px; }
  .contact h2 { font-size: 32px; }
  .footer { gap: 17px; flex-wrap: wrap; padding-block: 25px; }
  .footer > p { margin-left: auto; font-size: 14px; }
  .footer > span { margin-left: auto; }
  .desktop-break { display: none; }
}
@media (prefers-reduced-motion:reduce) {
  :root { scroll-behavior: auto; }
  *, *::before, *::after { transition: none !important; animation: none !important; }
}