:root {
  color-scheme: light;
  --paper: #f5f5f6;
  --surface: #ffffff;
  --ink: #25282d;
  --secondary: #60636b;
  --line: #dcdcE0;
  --soft: #ebebee;
  --marker: #ffe47a;
  --marker-ink: #25282d;
  --focus: #695018;
  --notice: #f4ead0;
  --notice-ink: #675022;
  --shadow: 0 20px 60px rgb(25 28 33 / 9%);
  font-family: -apple-system, BlinkMacSystemFont, "SF Pro Display", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  font-synthesis: none;
  -webkit-font-smoothing: antialiased;
  text-size-adjust: 100%;
  -webkit-text-size-adjust: 100%;
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    color-scheme: dark;
    --paper: #111214;
    --surface: #1d1f22;
    --ink: #f8f8f8;
    --secondary: #b1b3b8;
    --line: #3a3c41;
    --soft: #26282d;
    --focus: #ffe47a;
    --notice: #29251c;
    --notice-ink: #f0d895;
    --shadow: 0 20px 60px rgb(0 0 0 / 20%);
  }
}

:root[data-theme="dark"] {
  color-scheme: dark;
  --paper: #111214;
  --surface: #1d1f22;
  --ink: #f8f8f8;
  --secondary: #b1b3b8;
  --line: #3a3c41;
  --soft: #26282d;
  --focus: #ffe47a;
  --notice: #29251c;
  --notice-ink: #f0d895;
  --shadow: 0 20px 60px rgb(0 0 0 / 20%);
}

*, *::before, *::after { box-sizing: border-box; }
[hidden] { display: none !important; }
html { scroll-padding-top: 100px; }
body { margin: 0; background: var(--paper); color: var(--ink); font-size: 16px; line-height: 1.8; }
button, input { font: inherit; }
button, summary, a { -webkit-tap-highlight-color: transparent; }
button, summary { cursor: pointer; }
a { color: inherit; text-underline-offset: 5px; text-decoration-thickness: 1px; }
a:hover { text-decoration-thickness: 2px; }
button { color: inherit; }
img { display: block; max-width: 100%; height: auto; }
h1, h2, h3, p { margin: 0; }
h1, h2, h3 { text-wrap: balance; }
h1, h2 { letter-spacing: -0.035em; }
h2 { font-size: clamp(28px, 3.1vw, 40px); line-height: 1.45; font-weight: 650; }
h3 { font-size: 18px; line-height: 1.65; font-weight: 650; }
:focus-visible { outline: 3px solid var(--focus); outline-offset: 5px; border-radius: 3px; }
::selection { color: var(--marker-ink); background: var(--marker); }
.shell { width: min(1120px, calc(100% - 64px)); margin-inline: auto; }
.section { padding-block: 88px; }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0, 0, 0, 0); white-space: nowrap; border: 0; }
.skip-link { position: fixed; top: 8px; left: 16px; z-index: 30; transform: translateY(-180%); background: var(--ink); color: var(--paper); padding: 10px 20px; }
.skip-link:focus { transform: none; }

.site-header { position: sticky; top: 0; z-index: 10; background: var(--paper); border-bottom: 1px solid var(--line); }
.header-inner { height: 76px; display: flex; align-items: center; gap: 36px; }
.brand { display: inline-flex; align-items: center; gap: 11px; text-decoration: none; font-size: 18px; font-weight: 650; letter-spacing: -0.03em; white-space: nowrap; }
.brand img { border-radius: 10px; }
.desktop-nav { display: flex; align-items: center; gap: 30px; margin-left: auto; }
.desktop-nav a { display: inline-flex; align-items: center; min-height: 44px; font-size: 14px; text-decoration: none; white-space: nowrap; }
.desktop-nav a:hover, .desktop-nav a[aria-current] { text-decoration: underline; }
.header-actions { display: flex; align-items: center; gap: 12px; }
.theme-toggle { height: 40px; min-width: 64px; border: 1px solid var(--line); border-radius: 999px; background: transparent; font-size: 13px; white-space: nowrap; transition: background 160ms ease; }
.theme-toggle:hover { background: var(--soft); }
.mobile-menu { display: none; }

.hero { display: grid; grid-template-columns: 0.93fr 1.07fr; align-items: center; min-height: 620px; padding-block: 76px 90px; gap: 16px; }
.hero-copy { position: relative; z-index: 1; }
.eyebrow { font-size: 13px; font-weight: 550; letter-spacing: 0.06em; color: var(--secondary); margin-bottom: 24px; }
.hero h1 { font-size: clamp(44px, 5.2vw, 66px); line-height: 1.3; font-weight: 700; margin-bottom: 26px; }
.hero h1 > span { display: block; white-space: nowrap; }
mark { color: inherit; background: linear-gradient(transparent 59%, var(--marker) 59%, var(--marker) 94%, transparent 94%); padding-inline: 0.025em; }
@media (prefers-color-scheme: dark) { :root:not([data-theme="light"]) mark { background: linear-gradient(transparent 62%, #776121 62%, #776121 94%, transparent 94%); } }
:root[data-theme="dark"] mark { background: linear-gradient(transparent 62%, #776121 62%, #776121 94%, transparent 94%); }
.hero-description { max-width: 365px; font-size: 17px; line-height: 1.9; color: var(--secondary); }
.hero-actions { display: flex; align-items: center; flex-wrap: wrap; gap: 26px; margin-top: 34px; }
.button { min-height: 48px; display: inline-flex; align-items: center; justify-content: center; gap: 18px; border: 1px solid transparent; border-radius: 12px; padding: 11px 22px; font-size: 14px; line-height: 1.5; font-weight: 600; white-space: nowrap; text-decoration: none; transition: transform 140ms ease, background 140ms ease; }
.button.primary { color: var(--paper); background: var(--ink); }
.button.secondary { color: var(--ink); background: var(--surface); border-color: var(--line); }
.button:hover { transform: translateY(-2px); text-decoration: none; }
.button:active { transform: translateY(0); }
.text-link { display: inline-flex; align-items: center; gap: 14px; min-height: 44px; font-weight: 550; font-size: 14px; white-space: nowrap; }
.hero-visual { min-width: 0; }
.hero-art { width: 100%; border-radius: 4px; }

.method-section { border-top: 1px solid var(--line); }
.section-heading { display: flex; justify-content: space-between; align-items: end; gap: 40px; }
.section-heading > p { max-width: 310px; color: var(--secondary); }
.learning-loop { list-style: none; padding: 0; margin: 50px 0 0; display: grid; grid-template-columns: repeat(4, 1fr); gap: 32px; }
.learning-loop li { border-top: 1px solid var(--line); padding-top: 22px; }
.step-number { font-size: 12px; color: var(--secondary); font-variant-numeric: tabular-nums; }
.learning-loop h3 { margin: 14px 0 8px; }
.learning-loop p { font-size: 14px; color: var(--secondary); line-height: 1.8; }

.features-section { background: var(--surface); }
.features-grid { display: grid; grid-template-columns: 1fr 1fr; align-items: center; gap: 84px; }
.product-image { max-width: 296px; justify-self: center; padding: 7px; border-radius: 28px; border: 1px solid var(--line); background: #f5f5f6; box-shadow: var(--shadow); }
.product-image img { border-radius: 21px; }
.section-intro { margin-top: 16px; color: var(--secondary); }
.feature-item { padding-top: 22px; margin-top: 22px; border-top: 1px solid var(--line); }
.feature-item h3 { font-size: 17px; margin-bottom: 7px; }
.feature-item p { font-size: 14px; color: var(--secondary); }
.privacy-summary { display: grid; grid-template-columns: 1fr 1fr; gap: 84px; align-items: center; }
.privacy-heading { display: flex; align-items: center; gap: 25px; }
.privacy-heading img { border-radius: 18px; }
.privacy-summary-copy p { color: var(--secondary); margin-bottom: 15px; }
.availability { border-top: 1px solid var(--line); padding-block: 76px; text-align: center; }
.availability h2 { font-size: clamp(25px, 3vw, 34px); }
.availability > p { color: var(--secondary); margin-top: 14px; }
.availability .button { margin-top: 24px; }
.availability .release-status { display: inline-block; margin-top: 24px; padding: 8px 18px; border: 1px solid var(--line); border-radius: 999px; font-size: 13px; }

.page-heading { padding-block: 66px 38px; }
.page-heading .eyebrow { margin-bottom: 18px; }
.page-heading h1 { font-size: clamp(38px, 4.5vw, 54px); font-weight: 650; line-height: 1.4; }
.page-heading > p:last-of-type { color: var(--secondary); margin-top: 22px; max-width: 600px; }
.support-layout { padding-top: 20px; display: grid; grid-template-columns: minmax(0, 1fr) 330px; gap: 76px; align-items: start; }
.faq-section h2, .contact-panel h2, .support-links h2 { font-size: 23px; margin-bottom: 22px; }
.faq-list { border-top: 1px solid var(--line); }
.faq-list details { border-bottom: 1px solid var(--line); }
.faq-list summary { display: flex; align-items: center; justify-content: space-between; gap: 22px; padding: 23px 0; font-size: 16px; line-height: 1.65; font-weight: 550; list-style: none; }
.faq-list summary::-webkit-details-marker, .mobile-menu summary::-webkit-details-marker { display: none; }
.faq-list summary::after { content: "+"; flex: 0 0 24px; text-align: center; font-size: 23px; font-weight: 400; color: var(--secondary); }
.faq-list details[open] summary::after { content: "−"; }
.faq-answer { padding: 0 30px 24px 0; font-size: 15px; color: var(--secondary); }
.faq-answer p + p { margin-top: 15px; }
.link-gap { display: inline-block; width: 20px; }
.contact-panel { background: var(--surface); padding: 28px; border-radius: 16px; }
.contact-panel > p { font-size: 14px; color: var(--secondary); margin-bottom: 18px; }
.contact-email { display: inline-block; overflow-wrap: anywhere; font-size: 16px; font-weight: 600; margin-bottom: 22px; }
.contact-actions { display: flex; gap: 10px; flex-wrap: wrap; }
.contact-actions .button { padding-inline: 16px; }
.copy-status { font-size: 13px; padding-top: 10px; }
.copy-status:empty { display: none; }
.feedback-guide { border-top: 1px solid var(--line); margin-top: 26px; padding-top: 22px; }
.feedback-guide h3 { font-size: 15px; }
.feedback-guide ul { padding-left: 19px; font-size: 14px; color: var(--secondary); }
.small-copy { font-size: 13px; line-height: 1.85; color: var(--secondary); }
.support-links { border-top: 1px solid var(--line); padding-block: 42px 64px; }
.support-links .text-link { margin-right: 32px; }

.legal-heading { padding-bottom: 48px; border-bottom: 1px solid var(--line); }
.document-dates { display: flex; gap: 14px 30px; flex-wrap: wrap; margin-top: 24px; color: var(--secondary); font-size: 13px; }
.legal-layout { display: grid; grid-template-columns: 220px minmax(0, 1fr); gap: 72px; padding-block: 48px 64px; }
.toc { align-self: start; position: sticky; top: 112px; }
.toc p { font-size: 12px; color: var(--secondary); margin-bottom: 14px; }
.toc a { display: block; text-decoration: none; padding-block: 8px; font-size: 14px; }
.toc a:hover { text-decoration: underline; }
.legal-content { min-width: 0; font-size: 15px; line-height: 1.95; }
.legal-content > section { padding-bottom: 36px; margin-bottom: 36px; border-bottom: 1px solid var(--line); }
.legal-content h2 { font-size: 24px; letter-spacing: -0.015em; display: flex; align-items: baseline; gap: 15px; margin-bottom: 20px; }
.legal-content h2 > span { color: var(--secondary); font-size: 12px; font-weight: 500; letter-spacing: 0; }
.legal-content h3 { font-size: 16px; }
.legal-content p + p, .legal-content p + ul { margin-top: 16px; }
.legal-content ul { padding-left: 21px; }
.legal-content li + li { margin-top: 10px; }
.legal-content a { overflow-wrap: anywhere; }
.processor-list { background: var(--surface); padding: 24px; margin-block: 22px; border-radius: 10px; }
.processor-list section + section { margin-top: 20px; padding-top: 20px; border-top: 1px solid var(--line); }
.processor-list p { margin-top: 7px; color: var(--secondary); }
.policy-facts { margin-block: 24px; }
.policy-facts > div { display: grid; grid-template-columns: 150px minmax(0, 1fr); gap: 20px; padding-block: 16px; border-bottom: 1px solid var(--line); }
.policy-facts dt { font-weight: 550; }
.policy-facts dd { margin: 0; }
.unconfirmed { color: var(--notice-ink); background: var(--notice); padding: 2px 4px; -webkit-box-decoration-break: clone; box-decoration-break: clone; }
.document-end { text-align: right; }

.draft-notice { padding: 18px 22px; background: var(--notice); color: var(--notice-ink); display: flex; gap: 20px; font-size: 13px; border-radius: 8px; margin-block: 24px 40px; }
.draft-notice strong { white-space: nowrap; font-weight: 600; }
.site-footer { padding-top: 38px; padding-bottom: 26px; border-top: 1px solid var(--line); }
.footer-top { display: flex; align-items: center; justify-content: space-between; gap: 30px; padding-bottom: 26px; }
.footer-top > p { font-size: 14px; color: var(--secondary); }
.footer-bottom { display: flex; justify-content: space-between; align-items: center; gap: 24px; font-size: 12px; color: var(--secondary); }
.footer-bottom nav { display: flex; flex-wrap: wrap; gap: 10px 26px; }
.footer-bottom a { display: inline-flex; align-items: center; min-height: 36px; }

@media (min-width: 1440px) { .hero { min-height: 660px; } }
@media (max-width: 1000px) {
  .hero { min-height: 550px; padding-block: 66px; }
  .hero h1 { font-size: 50px; }
  .hero-description { max-width: 325px; font-size: 16px; }
  .features-grid, .privacy-summary { gap: 45px; }
  .support-layout { grid-template-columns: minmax(0, 1fr) 290px; gap: 36px; }
  .contact-panel { padding: 24px; }
  .legal-layout { grid-template-columns: 190px minmax(0, 1fr); gap: 36px; }
}

@media (max-width: 760px) {
  .shell { width: calc(100% - 40px); }
  .section { padding-block: 58px; }
  .header-inner { height: 68px; gap: 14px; }
  .brand { font-size: 16px; gap: 9px; }
  .brand img { width: 36px; height: 36px; }
  .desktop-nav { display: none; }
  .header-actions { margin-left: auto; gap: 8px; }
  .theme-toggle { min-width: 54px; height: 36px; }
  .mobile-menu { display: block; }
  .mobile-menu summary { list-style: none; padding: 8px 0 8px 8px; font-size: 14px; white-space: nowrap; min-height: 44px; display: flex; align-items: center; }
  .mobile-menu nav { position: absolute; top: 67px; left: 0; right: 0; padding: 12px 20px 18px; background: var(--surface); border-bottom: 1px solid var(--line); box-shadow: 0 14px 18px rgb(0 0 0 / 5%); }
  .mobile-menu nav a { display: block; padding-block: 11px; text-decoration: none; }
  .hero { display: flex; flex-direction: column; gap: 26px; align-items: stretch; padding-block: 44px 38px; min-height: unset; }
  .hero-copy { padding-inline: 4px; }
  .hero .eyebrow { margin-bottom: 18px; font-size: 12px; }
  .hero h1 { font-size: clamp(39px, 9.7vw, 56px); margin-bottom: 22px; line-height: 1.32; }
  .hero-description { max-width: 360px; }
  .hero-actions { margin-top: 26px; gap: 24px; }
  .hero-visual { max-width: 480px; width: 100%; align-self: center; }
  .section-heading { display: block; }
  .section-heading > p { margin-top: 18px; max-width: 330px; font-size: 15px; }
  .learning-loop { grid-template-columns: 1fr 1fr; gap: 30px 26px; margin-top: 32px; }
  .learning-loop li { padding-top: 17px; }
  .learning-loop h3 { margin-top: 10px; }
  .features-grid { grid-template-columns: 1fr; gap: 38px; }
  .feature-copy { grid-row: 1; }
  .feature-item { margin-top: 20px; padding-top: 20px; }
  .product-image { max-width: 266px; width: 78%; }
  .privacy-summary { grid-template-columns: 1fr; gap: 28px; }
  .privacy-heading { gap: 20px; }
  .privacy-heading img { width: 64px; height: 64px; }
  .privacy-summary-copy { font-size: 15px; }
  .availability { padding-block: 48px; }
  .availability h2 { max-width: 320px; margin-inline: auto; }
  .availability > p { font-size: 14px; }
  .page-heading { padding-block: 42px 34px; }
  .page-heading h1 { font-size: 38px; }
  .page-heading > p:last-of-type { font-size: 15px; }
  .support-layout { padding-top: 12px; grid-template-columns: 1fr; gap: 36px; }
  .faq-list summary { padding-block: 21px; font-size: 15px; }
  .faq-answer { padding-right: 10px; }
  .contact-panel { padding: 26px; }
  .support-links { padding-block: 32px 42px; }
  .legal-heading { padding-bottom: 30px; }
  .document-dates { gap: 8px 18px; font-size: 12px; }
  .legal-layout { grid-template-columns: 1fr; gap: 38px; padding-block: 30px 44px; }
  .toc { position: static; }
  .toc nav { display: flex; flex-wrap: wrap; gap: 6px 20px; }
  .toc p { width: 100%; margin-bottom: 2px; }
  .toc a { font-size: 13px; padding-block: 7px; }
  .legal-content { font-size: 15px; }
  .legal-content h2 { font-size: 23px; gap: 12px; }
  .legal-content > section { padding-bottom: 28px; margin-bottom: 30px; }
  .processor-list { padding: 20px; }
  .policy-facts > div { grid-template-columns: 1fr; gap: 7px; }
  .draft-notice { display: block; padding: 18px; margin-bottom: 28px; }
  .draft-notice strong { display: block; margin-bottom: 5px; }
  .footer-top { align-items: start; gap: 14px; }
  .footer-top > p { padding-top: 4px; font-size: 12px; }
  .footer-bottom { flex-direction: column; align-items: start; gap: 12px; }
  .footer-bottom nav { gap: 6px 20px; }
}

@media (prefers-reduced-motion: reduce) { *, *::before, *::after { transition: none !important; } }
@media print {
  :root { color-scheme: light; --paper: #fff; --surface: #fff; --ink: #111; --secondary: #444; --line: #ddd; --notice: #fff; --notice-ink: #444; }
  body { background: #fff; color: #111; font-size: 11pt; }
  .site-header, .site-footer, .toc, .skip-link, .document-end, .theme-toggle { display: none !important; }
  .shell { width: 100%; }
  .legal-layout { display: block; }
  .page-heading { padding-top: 0; }
  .legal-content { font-size: 11pt; }
  .legal-content > section { break-inside: auto; }
  h2, h3 { break-after: avoid; }
  .unconfirmed { color: #444; background: #fff; }
}