:root {
  color-scheme: light;
  --paper: #fafaf9;
  --ink: #17191e;
  --graphite: #111214;
  --orange: #ff8500;
  --accent-text: #b24d00;
  --muted: #62666e;
  --line: #dededb;
  --gutter: clamp(24px, 5vw, 72px);
  --text-body: 18px;
  --text-small: 14px;
  --heading-section: 36px;
  --heading-content: 24px;
  --content-columns: minmax(0, .7fr) minmax(0, 1.5fr);
  --column-gap: 64px;
  --section-space: 80px;
  --font: -apple-system, BlinkMacSystemFont, "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", sans-serif;
  font-family: var(--font);
  color: var(--ink);
  background: var(--paper);
  font-synthesis: none;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 24px; }
body { margin: 0; }
body:has(dialog[open]) { overflow: hidden; }
button, a, summary { -webkit-tap-highlight-color: transparent; }
button { font: inherit; color: inherit; border: 0; cursor: pointer; }
button, a { touch-action: manipulation; }
a { color: inherit; text-decoration: none; }
button, figure, h1, h2, h3, p { margin: 0; }
img { display: block; max-width: 100%; }
svg { width: 20px; height: 20px; fill: none; stroke: currentColor; stroke-width: 1.5; stroke-linecap: round; stroke-linejoin: round; flex-shrink: 0; }
:focus-visible { outline: 3px solid var(--accent-text); outline-offset: 6px; }
.hero :focus-visible, .site-header :focus-visible, .privacy-section :focus-visible, .interface-preview :focus-visible { outline-color: var(--orange); }
.page-width { width: calc(100% - var(--gutter) * 2); max-width: 1248px; margin-inline: auto; }
.section-space { padding-block: var(--section-space); }
h2 { font-size: var(--heading-section); font-weight: 600; line-height: 1.4; letter-spacing: -.025em; text-wrap: balance; }
h3 { font-size: var(--heading-content); font-weight: 600; line-height: 1.5; letter-spacing: -.015em; text-wrap: balance; }
p { font-size: var(--text-body); font-weight: 400; line-height: 1.85; text-wrap: pretty; }
.skip-link { position: fixed; z-index: 20; top: 16px; left: 16px; padding: 12px 20px; background: var(--paper); color: var(--ink); transform: translateY(-150%); }
.skip-link:focus { transform: translateY(0); }
.site-header { display: flex; align-items: center; justify-content: space-between; gap: 32px; min-height: 112px; position: absolute; top: 0; left: 0; right: 0; z-index: 5; color: #fff; }
.brand { display: inline-flex; align-items: center; gap: 12px; flex-shrink: 0; }
.brand img { border-radius: 10px; }
.brand strong { display: block; font-size: 24px; letter-spacing: .08em; font-weight: 600; line-height: 1.25; }
.brand-english { display: block; margin-top: 4px; font-size: var(--text-small); line-height: 1.25; color: var(--muted); }
.brand-light .brand-english { color: #cdcbc8; }
.primary-nav { display: flex; align-items: center; gap: 40px; font-size: 16px; font-weight: 500; }
.primary-nav a { display: flex; align-items: center; min-height: 48px; transition: color .2s; }
.primary-nav a:hover { color: #ffb164; }
.menu-toggle { display: none; }
.hero { position: relative; isolation: isolate; color: #fff; background: var(--graphite); overflow: clip; }
.hero-backdrop { position: absolute; z-index: -2; width: 100%; height: 100%; object-fit: cover; object-position: 50% 50%; }
.hero::before { content: ""; position: absolute; inset: 0; z-index: -1; background: linear-gradient(90deg, #090a0ce0 0%, #090a0c8c 40%, #090a0c0d 78%), linear-gradient(0deg, #090a0c30, transparent 50%); }
.hero-content { min-height: 740px; padding-block: 176px 88px; display: grid; grid-template-columns: minmax(0, .95fr) minmax(0, 1.15fr); gap: 48px; align-items: center; }
.hero-copy { min-width: 0; }
h1 { font-size: clamp(40px, 3.65vw, 56px); font-weight: 600; line-height: 1.4; letter-spacing: -.035em; }
h1 > span { display: block; white-space: nowrap; }
.hero-description { margin-top: 24px; max-width: 26em; color: #e2ded9; text-wrap: balance; }
.keep-phrase { white-space: nowrap; }
.hero-actions { display: flex; align-items: center; gap: 24px; margin-top: 32px; }
.button-primary { display: inline-flex; align-items: center; justify-content: center; gap: 16px; padding: 12px 20px; min-height: 48px; font-size: 16px; font-weight: 600; border-radius: 8px; background: var(--orange); color: #111214; transition: background .2s; }
.button-primary:hover { background: #ff9c30; }
.text-link { display: inline-flex; align-items: center; gap: 8px; min-height: 44px; font-size: 16px; font-weight: 500; }
.text-link:hover { color: var(--accent-text); }
.hero-preview { color: #e2ded9; }
.hero-preview:hover { color: #ffb164; }
.hero-preview svg, .mode-preview-link svg { width: 16px; }
.hero-note { margin-top: 24px; font-size: var(--text-small); color: #cbc8c4; max-width: 29em; }
.device { display: block; position: relative; padding: 16px 20px; border: 1px solid #747678; border-radius: 28px; background: linear-gradient(145deg, #343537, #08090a 6%, #101113 95%, #505154); box-shadow: 0 16px 32px #0003; }
.device img { width: 100%; height: auto; border-radius: 12px; background: #fff; }
.device-camera { position: absolute; top: 50%; left: 7px; width: 4px; height: 4px; background: #1b2532; border-radius: 50%; box-shadow: 0 0 0 1px #252525; }
.hero-device { width: 100%; box-shadow: 0 24px 40px #0006; }
.section-heading { display: flex; flex-direction: column; gap: 16px; }
.section-heading > p { color: var(--muted); max-width: 40em; }
.mode-tabs { display: flex; align-items: stretch; gap: 40px; margin-block: 32px 40px; border-bottom: 1px solid var(--line); }
.mode-tabs button { padding: 12px 0 16px; min-width: 72px; min-height: 52px; background: none; font-size: 18px; font-weight: 500; color: var(--muted); position: relative; text-align: left; }
.mode-tabs button::after { content: ""; position: absolute; height: 2px; background: var(--orange); bottom: -1px; left: 0; right: 0; opacity: 0; }
.mode-tabs button[aria-selected="true"] { color: var(--accent-text); }
.mode-tabs button[aria-selected="true"]::after { opacity: 1; }
.mode-tabs button:hover { color: var(--accent-text); }
.mode-panel { display: grid; grid-template-columns: var(--content-columns); align-items: start; gap: var(--column-gap); }
.mode-copy p { color: var(--muted); margin-top: 16px; }
.mode-preview-link { color: var(--accent-text); margin-top: 24px; }
.mode-media { min-width: 0; }
.workflow-device { width: 100%; }
figcaption { font-size: 13px; color: var(--muted); text-align: left; margin-top: 16px; line-height: 1.6; }
.privacy-section { color: #f4f4f2; background: var(--graphite); }
.privacy-layout { display: grid; grid-template-columns: var(--content-columns); gap: var(--column-gap); align-items: start; }
.privacy-overview h2 { max-width: 11em; }
.privacy-overview p { color: #c8c9cb; margin-top: 24px; }
.privacy-overview p + p { margin-top: 16px; }
.privacy-facts article + article { margin-top: 32px; padding-top: 32px; border-top: 1px solid #3b3d3f; }
.privacy-facts p { color: #c8c9cb; margin-top: 12px; }
.privacy-scope { margin-top: 40px; border-top: 1px solid #3b3d3f; }
.privacy-scope summary { padding-block: 24px 0; font-size: 16px; color: #c8c9cb; }
.privacy-scope-content { display: grid; grid-template-columns: 1fr 1fr; gap: 48px; padding-top: 24px; }
.privacy-scope-content p { color: #c8c9cb; font-size: 16px; }
.faq-layout { display: grid; grid-template-columns: var(--content-columns); gap: var(--column-gap); }
.faq-list { border-top: 1px solid var(--line); }
.faq-list details { border-bottom: 1px solid var(--line); }
summary { display: flex; align-items: center; justify-content: space-between; gap: 24px; cursor: pointer; list-style: none; line-height: 1.6; }
summary::-webkit-details-marker { display: none; }
.faq-list summary { padding-block: 24px; min-height: 80px; font-size: 18px; font-weight: 500; }
.disclosure-mark { display: block; width: 20px; height: 20px; flex-shrink: 0; position: relative; }
.disclosure-mark::before, .disclosure-mark::after { content: ""; position: absolute; width: 16px; height: 1.5px; background: currentColor; left: 2px; top: 9px; }
.disclosure-mark::after { transform: rotate(90deg); transition: transform .2s; }
details[open] > summary .disclosure-mark::after { transform: rotate(0); }
.faq-list details > p { padding: 0 40px 24px 0; color: var(--muted); }
.site-footer { border-top: 1px solid var(--line); padding-block: 32px; display: flex; align-items: center; justify-content: space-between; gap: 24px; }
.site-footer .brand strong { font-size: 20px; }
.site-footer p { font-size: var(--text-small); color: var(--muted); }
.footer-links { display: flex; align-items: center; flex-wrap: wrap; gap: 24px; color: var(--muted); }
.footer-links > a { display: inline-flex; align-items: center; min-height: 44px; font-size: var(--text-small); }
.footer-links > a:hover { color: var(--accent-text); }
.policy-entry { margin-top: 24px; }
.policy-entry .text-link { color: #d5d5d5; }
.policy-entry .text-link:hover { color: #ffb164; }
.back-to-top { display: inline-flex; align-items: center; gap: 8px; min-height: 44px; font-size: var(--text-small); color: var(--muted); }
.back-to-top:hover { color: var(--accent-text); }
.back-to-top svg { width: 18px; }
.interface-preview { width: min(1250px, calc(100% - 48px)); max-height: calc(100svh - 48px); padding: 24px; border: 1px solid #4c4d4f; border-radius: 12px; background: #181a1d; color: #f5f5f5; box-shadow: 0 20px 80px #0008; }
.interface-preview::backdrop { background: #080a0de8; backdrop-filter: blur(7px); }
.preview-header { display: flex; align-items: center; justify-content: space-between; gap: 24px; padding-bottom: 24px; }
.preview-header h2 { font-size: 20px; }
.preview-header p { font-size: 13px; color: #b8bbc1; margin-top: 8px; }
.close-preview { background: #ffffff0d; border: 1px solid #ffffff25; border-radius: 50%; display: grid; place-items: center; width: 44px; height: 44px; flex-shrink: 0; }
.close-preview:hover { background: #ffffff20; }
.preview-image-wrap { overflow: auto; max-height: calc(100svh - 180px); border-radius: 6px; background: #fff; }
.preview-image-wrap img { width: 100%; height: auto; }
.document-header { position: relative; color: var(--ink); border-bottom: 1px solid var(--line); }
.document-header .primary-nav a:hover, .document-header .primary-nav a[aria-current="page"] { color: var(--accent-text); }
.document-header .primary-nav a[aria-current="page"] { text-decoration: underline; text-underline-offset: 8px; }
.document-header :focus-visible { outline-color: var(--accent-text); }
.document-main { padding-block: 64px 80px; }
.document-intro { margin-bottom: 40px; }
.document-intro h1 { font-size: 44px; line-height: 1.4; }
.document-intro p { margin-top: 16px; max-width: 48em; color: var(--muted); }
.document-intro .document-meta { font-size: var(--text-small); }
.document-layout { display: grid; grid-template-columns: var(--content-columns); gap: var(--column-gap); align-items: start; border-top: 1px solid var(--line); padding-top: 40px; }
.document-sidebar { min-width: 0; position: sticky; top: 24px; }
.document-sidebar h2, .document-label { font-size: 16px; font-weight: 500; line-height: 1.7; margin-bottom: 16px; }
.document-sidebar nav { display: grid; }
.document-sidebar nav a { display: flex; align-items: center; min-height: 44px; font-size: 16px; line-height: 1.6; color: var(--muted); }
.document-sidebar nav a:hover { color: var(--accent-text); }
.document-sidebar dl { margin: 0; }
.document-sidebar dt { font-size: var(--text-small); color: var(--muted); line-height: 1.7; }
.document-sidebar dd { margin: 8px 0 24px; font-size: 16px; line-height: 1.85; overflow-wrap: anywhere; }
.document-content { min-width: 0; }
.document-content a { color: var(--accent-text); text-decoration: underline; text-underline-offset: 4px; overflow-wrap: anywhere; }
.document-section { scroll-margin-top: 32px; }
.document-section + .document-section { margin-top: 40px; }
.document-section h2 { font-size: var(--heading-content); }
.document-section h2 + p, .document-section h2 + ul { margin-top: 16px; }
.document-section p + p { margin-top: 16px; }
.document-section ul { padding-left: 24px; margin-block: 16px 0; font-size: var(--text-body); line-height: 1.85; }
.document-section li + li { margin-top: 8px; }
.document-content .contact-email { display: inline-flex; align-items: center; min-height: 44px; font-size: 28px; font-weight: 500; margin-block: 8px 16px; }
@media (max-width: 1100px) {
  :root { --heading-section: 32px; --heading-content: 24px; --section-space: 64px; --column-gap: 40px; }
  .hero-content { min-height: 680px; gap: 32px; padding-block: 160px 72px; }
  h1 { font-size: 40px; }
}
@media (max-width: 900px) {
  .hero-content { grid-template-columns: 1fr; min-height: 0; padding-block: 160px 64px; gap: 40px; }
  .hero-copy { max-width: 620px; }
  h1 { font-size: 48px; }
  .hero-device { max-width: 720px; }
  .hero-description { max-width: 29em; }
  .hero-backdrop { object-position: 58% 50%; }
  .hero::before { background: linear-gradient(180deg, #090a0cd9, #090a0c88 65%, #090a0c3d); }
  .mode-panel { grid-template-columns: 1fr; gap: 32px; }
  .mode-copy { max-width: 640px; }
  .mode-preview-link { margin-top: 16px; }
  .privacy-layout { grid-template-columns: 1fr; gap: 40px; }
  .privacy-overview { max-width: 640px; }
  .privacy-facts { display: grid; grid-template-columns: 1fr 1fr; gap: 32px; }
  .privacy-facts article + article { margin: 0; padding: 0 0 0 32px; border-top: 0; border-left: 1px solid #3b3d3f; }
  .privacy-scope-content { gap: 32px; }
  .faq-layout { grid-template-columns: 1fr; gap: 32px; }
  .document-layout { grid-template-columns: 1fr; gap: 40px; }
  .document-sidebar { position: static; }
  .document-sidebar nav { grid-template-columns: 1fr 1fr; gap: 0 24px; }
}
@media (max-width: 600px) {
  :root { --text-body: 16px; --heading-section: 28px; --heading-content: 22px; --section-space: 56px; }
  html { scroll-padding-top: 20px; }
  .site-header { min-height: 96px; }
  .brand img { width: 40px; height: 40px; }
  .brand strong { font-size: 21px; }
  .brand-english { font-size: 13px; }
  .menu-toggle { display: flex; flex-direction: column; justify-content: center; gap: 6px; padding: 10px; width: 44px; height: 44px; background: #0a0b0c66; border: 1px solid #ffffff40; border-radius: 8px; }
  .menu-toggle span { width: 20px; height: 1px; background: #fff; display: block; transition: transform .2s; }
  .menu-toggle[aria-expanded="true"] span:first-child { transform: translateY(3.5px) rotate(45deg); }
  .menu-toggle[aria-expanded="true"] span:last-child { transform: translateY(-3.5px) rotate(-45deg); }
  .primary-nav { display: none; position: absolute; top: 80px; left: 0; right: 0; padding: 16px 20px; background: #161719fa; border: 1px solid #ffffff25; border-radius: 8px; flex-direction: column; align-items: stretch; gap: 0; box-shadow: 0 12px 40px #0007; }
  .primary-nav.is-open { display: flex; }
  .primary-nav a { min-height: 48px; }
  .hero-content { padding-block: 144px 48px; gap: 32px; }
  h1 { font-size: clamp(30px, 9.2vw, 44px); line-height: 1.45; }
  .hero-description { margin-top: 20px; }
  .hero-actions { margin-top: 24px; gap: 24px; }
  .hero-note { margin-top: 20px; }
  .device { padding: 10px 14px; border-radius: 20px; }
  .device img { border-radius: 8px; }
  .device-camera { left: 5px; width: 3px; height: 3px; }
  .section-heading { gap: 12px; }
  .mode-tabs { margin-block: 24px 32px; gap: 32px; }
  .mode-tabs button { font-size: 17px; min-width: 64px; }
  .mode-copy p { margin-top: 12px; }
  figcaption { margin-top: 12px; }
  .privacy-layout { gap: 32px; }
  .privacy-overview p { margin-top: 20px; }
  .privacy-facts { display: block; }
  .privacy-facts article + article { border-left: 0; border-top: 1px solid #3b3d3f; padding: 24px 0 0; margin-top: 24px; }
  .privacy-scope { margin-top: 32px; }
  .privacy-scope summary { font-size: 15px; padding-top: 24px; gap: 16px; }
  .privacy-scope-content { grid-template-columns: 1fr; gap: 16px; }
  .privacy-scope-content p { font-size: 15px; }
  .faq-layout { gap: 24px; }
  .faq-list summary { min-height: 76px; font-size: 16px; gap: 16px; }
  .faq-list details > p { padding-right: 0; }
  .site-footer { flex-wrap: wrap; gap: 24px 16px; padding-block: 24px; }
  .site-footer .brand { margin-right: auto; }
  .site-footer .brand strong { font-size: 20px; }
  .site-footer p { order: 3; width: 100%; font-size: 13px; }
  .footer-links { gap: 16px; }
  .back-to-top { font-size: 14px; }
  .interface-preview { width: calc(100% - 24px); max-height: calc(100svh - 24px); padding: 16px; border-radius: 10px; }
  .preview-header { padding-bottom: 16px; gap: 16px; }
  .preview-header h2 { font-size: 18px; }
  .preview-header p { font-size: 13px; margin-top: 4px; }
  .preview-image-wrap { max-height: calc(100svh - 150px); }
  .document-main { padding-block: 40px 56px; }
  .document-intro { margin-bottom: 32px; }
  .document-intro h1 { font-size: 32px; }
  .document-layout { padding-top: 32px; gap: 32px; }
  .document-sidebar nav { column-gap: 16px; }
  .document-sidebar nav a { font-size: 15px; }
  .document-section + .document-section { margin-top: 32px; }
  .document-header .menu-toggle { color: var(--ink); background: transparent; border-color: var(--line); }
  .document-header .menu-toggle span { background: var(--ink); }
  .document-header .primary-nav { color: var(--ink); background: #fafaf9fc; border-color: var(--line); box-shadow: 0 12px 32px #0001; }
  .document-content .contact-email { font-size: 25px; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition-duration: .01ms !important; animation-duration: .01ms !important; animation-iteration-count: 1 !important; }
}