/* BirdsVision — natural-history editorial design. Shared by all six pages. */
@font-face {
  font-family: 'BirdsVision Noto Serif SC';
  src: url('fonts/noto-serif-sc-regular.woff?v=20260929') format('woff');
  font-style: normal;
  font-weight: 400;
  font-display: swap;
}
:root {
  --bg: #f6f5f0;
  --surface: #fffefa;
  --surface-soft: #eaece3;
  --primary: #344f3d;
  --primary-deep: #20372c;
  --primary-soft: #e6eadf;
  --primary-line: #c7cfc0;
  --text: #25382d;
  --muted: #626b60;
  --light: #71796e;
  --line: #d5d9cd;
  --accent: #a35932;
  --container: 1240px;
  --display: 'Songti SC', 'STSong', 'SimSun', serif;
  --body-serif: 'BirdsVision Noto Serif SC', 'Songti SC', 'SimSun', serif;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 100px; }
body { margin: 0; background: var(--bg); color: var(--text); font-family: 'PingFang SC', 'Microsoft YaHei', system-ui, sans-serif; line-height: 1.8; -webkit-font-smoothing: antialiased; }
::selection { background: #d8dfc8; color: var(--primary-deep); }
img { display: block; max-width: 100%; height: auto; }
a { color: inherit; text-decoration: none; }
button, summary { font: inherit; }
a, button, summary { -webkit-tap-highlight-color: transparent; }
a:focus-visible, button:focus-visible, summary:focus-visible { outline: 2px solid var(--accent); outline-offset: 5px; }
a:hover { text-underline-offset: 5px; }
.container { width: min(calc(100% - 96px), var(--container)); margin-inline: auto; }
.skip-link { position: fixed; top: 10px; left: 10px; z-index: 100; padding: 10px 18px; background: var(--primary-deep); color: white; transform: translateY(-160%); }
.skip-link:focus { transform: translateY(0); }
.site-header { position: sticky; top: 0; z-index: 40; background: var(--bg); border-bottom: 1px solid var(--line); }
.site-header__inner { display: flex; align-items: center; min-height: 88px; gap: 30px; }
.brand { display: inline-flex; align-items: center; gap: 12px; flex-shrink: 0; }
.brand img { width: 43px; height: 43px; border-radius: 10px; }
.brand__name { display: grid; color: var(--primary-deep); font-size: 23px; font-weight: 700; line-height: 1.15; letter-spacing: .12em; }
.brand__name small { margin-top: 6px; font-family: Arial, sans-serif; font-size: 10px; letter-spacing: .13em; font-weight: 500; }
.desktop-nav { display: flex; align-items: center; gap: 26px; margin-left: auto; }
.desktop-nav a { padding: 14px 0; font-size: 13px; white-space: nowrap; border-bottom: 1px solid transparent; }
.desktop-nav a:hover, .desktop-nav a[aria-current='page'] { color: var(--accent); border-bottom-color: var(--accent); }
.release-status { padding-left: 24px; border-left: 1px solid var(--line); max-width: 150px; font-size: 10px; line-height: 1.6; color: var(--muted); }
.mobile-menu { display: none; margin-left: auto; }
.mobile-menu summary { list-style: none; cursor: pointer; width: 44px; height: 44px; display: grid; place-items: center; font-size: 0; }
.mobile-menu summary::-webkit-details-marker { display: none; }
.mobile-menu summary::before { content: '☰'; font-size: 25px; }
.mobile-menu[open] summary::before { content: '×'; font-size: 30px; }
.mobile-menu__panel { position: absolute; left: 0; right: 0; top: 100%; display: grid; padding: 16px 28px 24px; background: var(--bg); border-bottom: 1px solid var(--primary-line); box-shadow: 0 18px 22px #20372c12; }
.mobile-menu__panel a { padding: 10px 0; border-bottom: 1px solid var(--line); font-size: 15px; }
.mobile-menu__panel span { margin-top: 16px; font-size: 12px; color: var(--muted); }
.eyebrow { display: block; margin: 0 0 25px; color: var(--accent); font-size: 12px; font-weight: 600; letter-spacing: .16em; }
.hero { padding: 48px 0 60px; }
.hero__grid { display: grid; grid-template-columns: minmax(0, .9fr) minmax(0, 1.1fr); align-items: center; gap: 60px; }
.hero h1 { margin: 0; color: var(--primary-deep); font-family: var(--display); font-size: clamp(42px, 4.4vw, 67px); font-weight: 500; line-height: 1.4; letter-spacing: -.055em; }
.hero h1 span { display: block; }
.hero__lead { max-width: 430px; margin: 25px 0 0; font-size: 16px; color: var(--muted); line-height: 2; }
.store-badges { display: flex; flex-wrap: wrap; gap: 12px; }
.store-badges--hero { margin-top: 34px; }
.store-badge { display: flex; align-items: center; width: 190px; max-width: 100%; height: 57px; overflow: hidden; color: #fff; background: #000; border: 0; border-radius: 7px; transition: opacity .15s; }
.store-badge:hover { opacity: .8; }
.store-badge__official { width: 100%; height: 100%; object-fit: contain; clip-path: inset(6% 3%); }
.store-badge--android { gap: 12px; padding: 8px 14px; }
.store-badge__icon { width: 34px; height: 29px; flex: 0 0 34px; object-fit: contain; }
.store-badge__copy, .store-badge__copy small, .store-badge__copy strong { display: block; }
.store-badge__copy small { font-size: 10px; line-height: 1.4; color: #ddd; }
.store-badge__copy strong { font-size: 17px; line-height: 1.4; font-weight: 600; }
.hero__process-link { display: inline-block; margin-top: 23px; padding-bottom: 3px; border-bottom: 1px solid var(--primary-line); font-size: 13px; }
.hero__process-link span { margin-left: 24px; }
.hero__note { max-width: 450px; margin: 22px 0 0; font-size: 11px; line-height: 1.8; color: var(--light); }
.hero-card { position: relative; width: 100%; margin: 0; overflow: hidden; background: #465638; }
.hero-card__photo { width: 100%; height: 620px; object-fit: cover; transform: scale(1.025); }
.hero-card__result { position: absolute; left: 0; right: 0; bottom: 0; display: flex; justify-content: space-between; align-items: end; gap: 20px; padding: 50px 28px 24px; color: white; background: linear-gradient(transparent, #152318b8); }
.hero-card__result small { display: block; font-size: 10px; letter-spacing: .1em; }
.hero-card__result strong { display: block; font-family: var(--display); font-size: 26px; font-weight: 400; }
.hero-card__result > span { font-size: 11px; }
.metrics { display: grid; grid-template-columns: repeat(4, minmax(0,1fr)); margin-bottom: 20px; padding-block: 25px; border-block: 1px solid var(--line); }
.metric { padding: 0 28px; border-left: 1px solid var(--line); }
.metric:first-child { border-left: 0; padding-left: 0; }
.metric strong { display: block; font-family: var(--display); font-size: 28px; font-weight: 400; line-height: 1.4; }
.metric span { display: block; margin-top: 7px; color: var(--muted); font-size: 12px; }
.section { padding: 100px 0; }
.section--soft { background: var(--surface-soft); }
.section-heading { max-width: 760px; margin-bottom: 50px; }
.section-heading h2, .preview-copy h2, .page-hero h1 { margin: 0; color: var(--primary-deep); font-family: var(--display); font-size: clamp(32px, 3.3vw, 46px); font-weight: 500; line-height: 1.5; letter-spacing: -.03em; }
.section-heading p:not(.eyebrow), .page-hero__lead { max-width: 700px; margin: 18px 0 0; color: var(--muted); font-size: 15px; line-height: 1.95; }
.section-heading--center { text-align: left; margin-inline: 0; }
#features { background: var(--bg); padding-bottom: 70px; }
.feature-grid { display: grid; grid-template-columns: repeat(3, minmax(0,1fr)); gap: 42px; }
.feature-card { padding-top: 24px; border-top: 1px solid var(--primary-line); }
.feature-card__number { color: var(--accent); font-family: Georgia, serif; font-style: italic; font-size: 22px; }
.feature-card h3, .step-card h3, .privacy-card h3, .support-card h2, .support-card h3 { margin: 18px 0 12px; font-size: 20px; font-weight: 500; }
.feature-card p, .step-card p, .privacy-card p, .support-card p { margin: 0; color: var(--muted); font-size: 14px; line-height: 1.95; }
#process { padding-top: 32px; padding-bottom: 65px; }
#process > .container { display: grid; grid-template-columns: .7fr 1.6fr; gap: 70px; padding-top: 50px; border-top: 1px solid var(--line); }
#process .section-heading { margin: 0; }
#process h2 { font-size: 30px; }
.process-grid { display: grid; grid-template-columns: repeat(3, minmax(0,1fr)); gap: 26px; }
.step-card__number { color: var(--accent); font-family: Georgia, serif; font-size: 24px; }
.step-card h3 { margin-top: 12px; font-size: 17px; }
.step-card p { font-size: 13px; }
.preview-grid { display: grid; grid-template-columns: .65fr .65fr 1.1fr; align-items: center; gap: 36px; }
.phone-preview { width: 100%; max-width: 260px; justify-self: center; margin: 0; padding: 6px; background: #242b24; border-radius: 28px; box-shadow: 0 20px 30px #26362b12; }
.phone-preview:nth-child(2) { transform: translateY(26px); }
.phone-preview img { width: 100%; border-radius: 23px; }
.preview-copy { padding-left: 24px; }
.preview-copy p:not(.eyebrow) { color: var(--muted); font-size: 14px; }
.check-list { padding: 0; margin: 28px 0; list-style: none; }
.check-list li { padding: 10px 0; border-bottom: 1px solid #cbd1c3; font-size: 13px; }
.check-list li::before { content: '—'; margin-right: 12px; color: var(--accent); }
.preview-copy .preview-caption { font-size: 11px; }
.model-roadmap .section-heading { max-width: 950px; }
.model-roadmap__context { display: grid; grid-template-columns: 220px 1fr; gap: 35px; padding: 24px 0; border-block: 1px solid var(--line); }
.model-roadmap__context strong, .model-roadmap__note strong { font-size: 16px; font-weight: 500; }
.model-roadmap__context p, .model-roadmap__note p { margin: 0; color: var(--muted); font-size: 13px; }
.model-roadmap__logic { display: flex; align-items: center; gap: 35px; margin: 32px 0; }
.model-roadmap__logic-item { display: flex; gap: 16px; align-items: center; }
.model-roadmap__logic-item span { font-size: 12px; color: var(--accent); }
.model-roadmap__logic-item strong { font-size: 14px; font-weight: 500; }
.model-roadmap__logic-arrow { color: var(--accent); }
.model-stage-list { margin: 0; padding: 0; list-style: none; }
.model-stage { display: grid; grid-template-columns: 220px 270px 1fr; gap: 35px; align-items: start; padding: 28px 0; border-top: 1px solid var(--line); }
.model-stage__top { display: flex; align-items: center; gap: 20px; }
.model-stage__number { color: var(--accent); font-family: Georgia, serif; font-size: 20px; }
.model-stage__status { font-size: 11px; color: var(--muted); }
.model-stage h3 { margin: 0; font-size: 18px; font-weight: 500; }
.model-stage p { margin: 0; font-size: 13px; color: var(--muted); }
.model-roadmap__note { display: grid; grid-template-columns: 220px 1fr; gap: 35px; padding: 22px 0; border-top: 1px solid var(--line); }
.open-source { color: #edf0e7; background: var(--primary-deep); }
.open-source .eyebrow { color: #c6b083; }
.open-source .section-heading h2 { color: #f5f5e9; }
.open-source .section-heading p:not(.eyebrow) { color: #bec9be; }
.open-source__grid { counter-reset: source; }
.source-card { display: grid; grid-template-columns: 220px 1fr 250px; column-gap: 35px; padding: 30px 0; border-top: 1px solid #4a6051; }
.source-card__top { grid-column: 1; display: flex; flex-direction: column; align-items: start; gap: 8px; font-size: 12px; color: #c6b083; }
.source-card__tag { color: #b8c5b6; font-size: 10px; letter-spacing: .04em; }
.source-card h3 { grid-column: 2; grid-row: 1; margin: 0 0 8px; font-family: var(--display); font-size: 27px; font-weight: 400; }
.source-card p { grid-column: 2; margin: 9px 0 0; color: #c8d1c4; font-size: 14px; }
.source-card .source-card__tech { grid-column: 1; grid-row: 2 / 5; margin-top: 16px; max-width: 180px; color: #b8c5b6; font-size: 11px; }
.source-card .source-card__scope { font-size: 12px; color: #aebfac; }
.source-card__links { grid-column: 3; grid-row: 1 / 5; display: flex; flex-direction: column; justify-content: center; align-items: stretch; }
.source-card__links a { display: flex; justify-content: space-between; gap: 16px; padding: 12px 0; border-bottom: 1px solid #4a6051; font-size: 12px; }
.source-card__links a:hover { color: #e4c997; }
.open-source__notes { display: grid; grid-template-columns: 1fr 1fr; gap: 60px; margin-top: 20px; padding-top: 35px; border-top: 1px solid #4a6051; }
.open-source__notes h3 { margin: 0 0 12px; font-size: 15px; font-weight: 500; }
.open-source__notes p { margin: 8px 0 0; color: #bec9be; font-size: 12px; }
#privacy > .container { display: grid; grid-template-columns: .8fr 1.2fr; gap: 80px; }
.privacy-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 30px; }
.privacy-card { padding-top: 18px; border-top: 1px solid var(--primary-line); }
.privacy-card h3 { margin: 0 0 10px; font-size: 17px; }
.privacy-card p { font-size: 13px; }
.privacy-card--wide { grid-column: 1 / -1; }
#faq { background: #eeeee6; }
#faq > .container { display: grid; grid-template-columns: 1fr 1fr; gap: 0 70px; }
#faq .section-heading { grid-column: 1 / -1; }
.accuracy-note { padding-right: 15px; }
.accuracy-note .eyebrow { font-size: 11px; }
.accuracy-note h3 { margin: 0 0 20px; font-family: var(--display); font-size: 27px; font-weight: 500; line-height: 1.6; }
.accuracy-note p { margin: 14px 0; font-size: 13px; color: var(--muted); }
.accuracy-note__contact { padding-top: 18px; border-top: 1px solid var(--line); }
.accuracy-note__contact a { text-decoration: underline; overflow-wrap: anywhere; }
.faq-list details { border-top: 1px solid var(--primary-line); }
.faq-list details:last-child { border-bottom: 1px solid var(--primary-line); }
.faq-list summary { position: relative; cursor: pointer; list-style: none; padding: 22px 32px 22px 0; font-size: 15px; }
.faq-list summary::-webkit-details-marker { display: none; }
.faq-list summary::after { content: '+'; position: absolute; right: 0; top: 18px; font-size: 23px; font-weight: 300; }
.faq-list details[open] summary::after { content: '−'; }
.faq-list p { margin: 0; padding-bottom: 24px; color: var(--muted); font-size: 13px; }
.cta-panel { display: flex; justify-content: space-between; align-items: center; gap: 50px; }
.cta-panel h2 { margin: 0; font-family: var(--display); font-size: clamp(28px, 3vw, 42px); font-weight: 400; }
.cta-panel p { margin: 14px 0 0; color: var(--muted); font-size: 14px; }
.button { display: inline-flex; align-items: center; justify-content: center; min-height: 50px; padding: 12px 26px; background: var(--primary-deep); color: white; border: 1px solid var(--primary-deep); border-radius: 2px; font-size: 14px; transition: background .15s; }
.button:hover { background: #3c5841; }
.cta-panel .button { flex-shrink: 0; }
.page-hero { padding: 75px 0 45px; }
.page-hero__inner { max-width: var(--container); }
.page-hero h1 { font-size: clamp(36px, 4vw, 56px); }
.page-meta { display: flex; flex-wrap: wrap; gap: 8px 24px; margin-top: 25px; color: var(--light); font-size: 12px; }
.store-badges--download { margin-bottom: 42px; }
.download-layout { display: grid; grid-template-columns: 1.1fr 1fr; gap: 65px; padding-bottom: 100px; align-items: start; }
.download-card { padding: 36px; background: var(--surface); border: 1px solid var(--line); }
.download-card__heading { display: flex; align-items: center; gap: 20px; }
.download-card__heading img { width: 68px; height: 68px; border-radius: 14px; flex-shrink: 0; }
.download-card__badge { color: var(--accent); font-size: 12px; }
.download-card h2 { margin: 5px 0; font-size: 26px; font-weight: 500; }
.download-card__heading p, .download-card__hint { margin: 0; color: var(--muted); font-size: 12px; }
.download-card__button { width: 100%; margin-top: 30px; }
.download-card__hint { margin-top: 14px; }
.release-details { margin: 30px 0 0; border-top: 1px solid var(--line); }
.release-details > div { display: grid; grid-template-columns: 110px minmax(0,1fr); gap: 18px; padding: 14px 0; border-bottom: 1px solid var(--line); font-size: 12px; }
.release-details dt { color: var(--muted); }
.release-details dd { margin: 0; min-width: 0; overflow-wrap: anywhere; }
.release-details code, .checksum-panel code { font-family: Consolas, monospace; }
.checksum-panel { margin-top: 25px; padding: 20px; background: var(--surface-soft); }
.checksum-panel strong { display: block; font-size: 12px; margin-bottom: 10px; }
.checksum-panel code { display: block; font-size: 11px; overflow-wrap: anywhere; }
.checksum-panel p { margin: 10px 0 0; font-size: 11px; color: var(--muted); }
.download-guide { display: grid; gap: 32px; }
.support-card { padding: 28px 0 0; border-top: 1px solid var(--primary-line); }
.support-card h2, .support-card h3 { margin-top: 0; }
.support-card p + p { margin-top: 12px; }
.install-steps { list-style: none; padding: 0; margin: 20px 0 0; counter-reset: install; }
.install-steps li { position: relative; padding: 0 0 22px 40px; counter-increment: install; }
.install-steps li::before { content: '0' counter(install); position: absolute; top: 0; left: 0; font-family: Georgia, serif; color: var(--accent); }
.install-steps strong, .install-steps span { display: block; font-size: 13px; }
.install-steps strong { font-weight: 500; }
.install-steps span { margin-top: 5px; color: var(--muted); font-size: 12px; }
.download-filing-list { padding-left: 18px; font-size: 12px; color: var(--muted); }
.document-layout { display: grid; grid-template-columns: minmax(0, 1fr) 230px; gap: 100px; padding-bottom: 100px; }
.document { min-width: 0; padding: 35px 0 0; border-top: 1px solid var(--primary-line); }
.document section + section { margin-top: 38px; }
.document h2 { margin: 0 0 14px; font-size: 20px; font-weight: 500; }
.document p, .document li { margin: 0; color: #526052; font-size: 15px; line-height: 2.1; }
.document p + p, .document ul, .document ol { margin-top: 14px; }
.document a, .support-card a { color: var(--primary); text-decoration: underline; text-underline-offset: 4px; overflow-wrap: anywhere; }
.document-nav { position: sticky; align-self: start; top: 115px; padding: 24px 0 24px 28px; border-left: 1px solid var(--primary-line); }
.document-nav strong { display: block; margin-bottom: 14px; font-size: 13px; font-weight: 500; }
.document-nav a { display: block; padding: 7px 0; color: var(--muted); font-size: 12px; }
.document-nav a:hover { color: var(--accent); }
.support-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 45px 70px; padding-bottom: 100px; }
.support-card--wide { grid-column: 1 / -1; }
.support-email { display: inline-block; margin-top: 20px; font-family: Georgia, serif; font-size: clamp(18px, 3vw, 32px); }
.notice { margin-top: 22px; padding: 14px 18px; background: var(--surface-soft); border-left: 2px solid var(--primary-line); color: var(--muted); font-size: 12px; }
.site-footer { padding: 50px 0 28px; background: #e6e9df; border-top: 1px solid var(--primary-line); }
.site-footer__top { display: flex; justify-content: space-between; align-items: start; gap: 40px; }
.site-footer__brand p { margin: 18px 0 0; font-size: 12px; color: var(--muted); }
.site-footer__links { display: flex; flex-wrap: wrap; gap: 12px 26px; font-size: 12px; }
.site-footer__links a:hover { text-decoration: underline; }
.site-footer__bottom { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 12px 25px; padding-top: 25px; margin-top: 36px; border-top: 1px solid var(--primary-line); font-size: 10px; color: var(--muted); }
.site-footer__filings { display: flex; flex-wrap: wrap; gap: 10px 20px; }
.public-security-link { display: inline-flex; align-items: center; gap: 6px; }
.public-security-link .public-security-icon { width: 18px; height: 20px; margin: 0; border-radius: 0; flex-shrink: 0; }
.brand-attribution { max-width: 920px; font-size: 10px; line-height: 1.6; color: var(--muted); margin: 18px 0 0; }
.error-page { min-height: 100vh; display: grid; place-items: center; padding: 35px; }
.error-card { max-width: 650px; text-align: center; }
.error-card > img { width: 65px; height: 65px; margin: 0 auto 32px; border-radius: 13px; }
.error-code { margin: 0; font-family: var(--display); font-size: 130px; line-height: 1.2; color: var(--primary); }
.error-card h1 { font-family: var(--display); font-size: 32px; font-weight: 400; }
.error-card p:not(.error-code) { color: var(--muted); font-size: 14px; margin-bottom: 30px; }
.error-page__filings { display: flex; flex-wrap: wrap; justify-content: center; gap: 12px; margin-top: 50px; font-size: 11px; color: var(--muted); }
@media (max-width: 1200px) {
  .release-status { display: none; }
  .desktop-nav { gap: 22px; }
  .hero__grid { gap: 38px; }
  .hero-card__photo { height: 570px; }
  .model-stage { grid-template-columns: 160px 220px 1fr; gap: 28px; }
  .source-card { grid-template-columns: 150px 1fr 210px; gap: 0 28px; }
  #privacy > .container { gap: 45px; }
}
@media (max-width: 980px) {
  .container { width: calc(100% - 56px); }
  .desktop-nav, .release-status { display: none; }
  .mobile-menu { display: block; }
  .hero__grid { grid-template-columns: 1fr 1fr; gap: 28px; }
  .hero h1 { font-size: 42px; }
  .hero-card__photo { height: 580px; }
  .hero__lead { font-size: 14px; }
  .hero__note { font-size: 10px; }
  .section { padding-block: 75px; }
  .feature-grid { gap: 25px; }
  #process > .container { grid-template-columns: 1fr; gap: 30px; }
  .preview-grid { grid-template-columns: 1fr 1fr; gap: 28px; }
  .preview-copy { grid-column: 1 / -1; grid-row: 1; padding: 0; max-width: 650px; }
  .phone-preview { max-width: 260px; }
  .model-stage { grid-template-columns: 150px 1fr; gap: 15px 25px; }
  .model-stage p { grid-column: 2; }
  .model-stage__top { grid-row: 1 / 3; flex-direction: column; align-items: start; gap: 8px; }
  .source-card { grid-template-columns: 150px 1fr; }
  .source-card__links { grid-column: 2; grid-row: auto; margin-top: 15px; }
  #privacy > .container { grid-template-columns: 1fr; gap: 0; }
  #faq > .container { gap: 0 35px; }
  .download-layout { grid-template-columns: 1fr; gap: 45px; }
  .download-guide { grid-template-columns: 1fr 1fr; gap: 30px; }
  .document-layout { gap: 40px; grid-template-columns: minmax(0,1fr) 170px; }
}
@media (max-width: 680px) {
  html { scroll-padding-top: 90px; }
  .container { width: calc(100% - 40px); }
  .site-header__inner { min-height: 72px; }
  .brand img { width: 36px; height: 36px; }
  .brand__name { font-size: 20px; }
  .brand__name small { font-size: 9px; }
  .hero { padding-top: 34px; padding-bottom: 30px; }
  .hero__grid { grid-template-columns: 1fr; gap: 28px; }
  .hero h1 { font-size: clamp(36px, 10vw, 52px); line-height: 1.4; }
  .eyebrow { margin-bottom: 18px; font-size: 11px; }
  .hero__lead { margin-top: 20px; font-size: 14px; }
  .store-badges--hero { margin-top: 25px; }
  .store-badges { gap: 9px; }
  .store-badge { width: 163px; height: 49px; }
  .store-badge--android { padding: 7px 11px; gap: 9px; }
  .store-badge__icon { width: 28px; flex-basis: 28px; }
  .store-badge__copy strong { font-size: 15px; }
  .store-badge__copy small { font-size: 9px; }
  .hero__note { font-size: 10px; }
  .hero-card__photo { height: auto; aspect-ratio: 1.08; }
  .hero-card__result { padding: 40px 20px 15px; }
  .hero-card__result strong { font-size: 22px; }
  .hero-card__result > span { font-size: 10px; }
  .metrics { grid-template-columns: 1fr 1fr; padding-block: 0; margin-bottom: 0; }
  .metric, .metric:first-child { padding: 20px 0; border-left: 0; }
  .metric:nth-child(even) { padding-left: 20px; }
  .metric:nth-child(n+3) { border-top: 1px solid var(--line); }
  .metric strong { font-size: 24px; }
  .metric span { font-size: 10px; }
  .section { padding-block: 58px; }
  .section-heading { margin-bottom: 30px; }
  .section-heading h2, .preview-copy h2 { font-size: 30px; }
  .section-heading p:not(.eyebrow) { font-size: 13px; }
  .feature-grid { grid-template-columns: 1fr; gap: 28px; }
  .feature-card { display: grid; grid-template-columns: 42px 1fr; column-gap: 16px; padding-top: 20px; }
  .feature-card__number { grid-row: 1 / 3; }
  .feature-card h3 { margin: 0 0 10px; }
  .feature-card p { grid-column: 2; font-size: 13px; }
  #features { padding-bottom: 40px; }
  #process { padding-top: 0; padding-bottom: 50px; }
  #process > .container { padding-top: 35px; }
  .process-grid { grid-template-columns: 1fr; gap: 25px; }
  .step-card { display: grid; grid-template-columns: 42px 1fr; gap: 0 16px; }
  .step-card__number { grid-row: 1 / 3; }
  .step-card h3 { margin: 0 0 6px; }
  .step-card p { grid-column: 2; }
  .preview-grid { gap: 22px 14px; }
  .phone-preview { border-radius: 18px; padding: 4px; }
  .phone-preview img { border-radius: 14px; }
  .phone-preview:nth-child(2) { transform: translateY(14px); }
  .model-roadmap__context, .model-roadmap__note { grid-template-columns: 1fr; gap: 12px; }
  .model-roadmap__logic { gap: 12px; }
  .model-roadmap__logic-item { flex-direction: column; align-items: start; gap: 5px; }
  .model-roadmap__logic-item strong { font-size: 12px; }
  .model-stage { grid-template-columns: 1fr; gap: 12px; padding-block: 24px; }
  .model-stage__top { grid-row: auto; flex-direction: row; align-items: center; gap: 16px; }
  .model-stage p { grid-column: auto; }
  .source-card { grid-template-columns: 1fr; gap: 0; padding-block: 28px; }
  .source-card__top { flex-direction: row; align-items: center; justify-content: space-between; }
  .source-card h3 { grid-column: 1; grid-row: auto; margin-top: 14px; font-size: 26px; }
  .source-card p { grid-column: 1; font-size: 13px; }
  .source-card .source-card__tech { grid-column: 1; grid-row: auto; margin: 0 0 8px; max-width: none; }
  .source-card__links { grid-column: 1; grid-row: auto; }
  .open-source__notes { grid-template-columns: 1fr; gap: 26px; }
  .privacy-grid { grid-template-columns: 1fr; gap: 25px; }
  .privacy-card--wide { grid-column: auto; }
  #faq > .container { grid-template-columns: 1fr; gap: 30px; }
  #faq .section-heading { margin: 0; }
  .accuracy-note { padding: 0; }
  .accuracy-note h3 { font-size: 25px; }
  .cta-panel { flex-direction: column; align-items: start; gap: 25px; }
  .page-hero { padding: 45px 0 35px; }
  .page-hero h1 { font-size: 36px; }
  .page-hero__lead { font-size: 14px; }
  .download-layout, .support-grid, .document-layout { padding-bottom: 60px; }
  .download-card { padding: 24px 18px; }
  .download-card__heading { gap: 14px; }
  .download-card__heading img { width: 52px; height: 52px; }
  .download-card h2 { font-size: 21px; }
  .release-details > div { grid-template-columns: 86px minmax(0,1fr); gap: 10px; }
  .download-guide, .support-grid { grid-template-columns: 1fr; }
  .document-layout { grid-template-columns: 1fr; gap: 24px; }
  .document-nav { position: static; grid-row: 1; display: flex; flex-wrap: wrap; gap: 6px 18px; padding: 16px 0; border-left: 0; border-block: 1px solid var(--line); }
  .document-nav strong { width: 100%; margin-bottom: 5px; }
  .document-nav a { padding: 3px 0; }
  .document { border-top: 0; padding-top: 5px; }
  .document p { font-size: 14px; }
  .document h2 { font-size: 19px; }
  .support-card--wide { grid-column: auto; }
  .support-grid { gap: 28px; }
  .site-footer__top { flex-direction: column; gap: 25px; }
  .site-footer__bottom { flex-direction: column; font-size: 10px; }
  .site-footer__links { gap: 12px 20px; }
  .error-page { padding: 24px; }
  .error-code { font-size: 100px; }
  .error-card h1 { font-size: 26px; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition: none !important; animation: none !important; }
}

/* Reading text uses the approved serif; headings and interface labels retain their fonts. */
.hero__lead,
.section-heading p:not(.eyebrow), .page-hero__lead,
.feature-card p, .step-card p, .privacy-card p, .support-card p,
.preview-copy p:not(.eyebrow):not(.preview-caption),
.model-roadmap__context p, .model-roadmap__note p, .model-stage p,
.source-card p:not(.source-card__tech):not(.source-card__scope),
.open-source__notes p, .accuracy-note p:not(.eyebrow), .faq-list p,
.cta-panel p, .document p, .document li,
.error-card p:not(.error-code) {
  font-family: var(--body-serif);
  font-weight: 400;
  font-size: 15px;
  line-height: 2;
}
.hero__lead, .section-heading p:not(.eyebrow), .page-hero__lead { font-size: 17px; }
.document p, .document li { font-size: 16px; }
@media (max-width: 680px) {
  .hero__lead, .section-heading p:not(.eyebrow), .page-hero__lead { font-size: 16px; }
}