:root {
  color-scheme: dark;
  --ink: #f5f8f7;
  --muted: #b2c2c0;
  --dark: #020607;
  --light: #eff0f2;
  --accent: #00d2b5;
  --deep-accent: #006e61;
  --header-height: 64px;
  --ease-out: cubic-bezier(.23,1,.32,1);
  font-family: -apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;
  font-synthesis: none;
}
* { box-sizing: border-box; }
body { margin: 0; background: var(--dark); color: var(--ink); }
[hidden] { display: none !important; }
a { color: inherit; text-decoration: none; }
button,a { -webkit-tap-highlight-color: transparent; touch-action: manipulation; }
img,video { max-width: 100%; }
button { font: inherit; }
p,h1,h2,ul { margin: 0; }
ul { padding: 0; list-style: none; }
a:focus-visible,button:focus-visible,summary:focus-visible { outline: 3px solid var(--accent); outline-offset: 5px; }
main:focus,section:focus,h2[tabindex]:focus { outline: none; }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip-path: inset(50%); white-space: nowrap; }
.skip-link { position: fixed; top: 8px; left: 16px; z-index: 20; background: var(--accent); color: var(--dark); padding: 12px 16px; transform: translateY(-150%); }
.skip-link:focus { transform: none; }
.site-header { height: var(--header-height); background: var(--dark); position: sticky; top: 0; z-index: 10; }
.header-inner { max-width: 1248px; margin: auto; height: 100%; padding: 0 24px; display: flex; align-items: center; justify-content: flex-start; gap: 56px; }
.brand { display: flex; align-items: center; min-height: 44px; }
.brand img { display: block; width: 200px; height: auto; }
.header-link { margin-left: auto; font-size: 16px; min-height: 44px; display: inline-flex; align-items: center; gap: 8px; white-space: nowrap; }
.header-link span { color: var(--accent); }
.hero { min-height: 680px; height: calc(100svh - var(--header-height)); position: relative; overflow: hidden; background: #010504; }
.hero-media { position: absolute; inset: 0; pointer-events: none; }
.hero-media img,.hero-media video { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; object-position: center top; transform: scale(1.18); transform-origin: 50% 22%; }
.hero-media video { visibility: hidden; }
.hero-media video.is-playing { visibility: visible; }
.hero-content { position: relative; text-align: center; z-index: 1; padding: 36px 24px 0; }
.hero h1 { font-size: clamp(52px,4.73vw,68px); line-height: 1.4; font-weight: 500; letter-spacing: -.025em; }
.hero strong,.feature strong { font-weight: inherit; color: #00cdbd; }
@supports (background-clip: text) {
  .hero strong,.feature strong { background: linear-gradient(100deg,#3b83f3,#05d9c7); background-clip: text; color: transparent; }
  .hero strong,.feature-dark strong { background-image: linear-gradient(100deg,#00c6bf,#72ebd8); }
}
.download-slot { margin: 24px auto 0; min-height: 52px; }
.download { display: inline-flex; align-items: center; justify-content: center; gap: 12px; width: 306px; max-width: 100%; min-height: 52px; padding: 12px 24px; border-radius: 4px; background: linear-gradient(100deg,#00c5c2,#2de4c8); color: #00372e; font-weight: 600; font-size: 17px; transition: transform 120ms var(--ease-out),filter 150ms ease; }
.download:active { transform: scale(.98); transition-duration: 0ms; }
.social-marks { position: absolute; z-index: 1; bottom: 20px; left: 50%; transform: translateX(-50%); display: flex; justify-content: center; gap: 28px; padding: 14px 24px; background: #032b27ad; border: 1px solid #1e746050; }
.social-marks li { display: grid; justify-items: center; gap: 7px; }
.social-marks img { width: 28px; height: 28px; object-fit: contain; }
.social-marks span { font-size: 11px; color: #c4d6d0; }
.chapter-rail { position: fixed; z-index: 5; top: 50%; left: max(12px,calc((100vw - 1240px)/2)); transform: translateY(-50%); visibility: hidden; }
.chapter-rail[data-visible] { visibility: visible; }
.chapter-rail a { display: block; position: relative; width: 44px; height: 60px; }
.chapter-rail a::before { content: ""; position: absolute; top: 0; bottom: 0; left: 20px; width: 1px; background: #16a69850; }
.chapter-rail a[aria-current]::before { width: 2px; background: #00cdbd; }
.feature { scroll-margin-top: var(--header-height); overflow: clip; }
.feature-light { color: #303332; background: var(--light); color-scheme: light; }
.feature-dark { color: var(--ink); background: var(--dark); }
.feature-stage { position: relative; height: calc(100svh - var(--header-height)); min-height: 680px; }
.feature-art { position: absolute; inset: 0; display: block; }
.feature-art img { display: block; width: 100%; height: 100%; object-fit: cover; object-position: center; }
.feature-copy { position: absolute; z-index: 1; left: max(64px,calc((100% - 1144px)/2)); top: 50%; transform: translateY(-50%); width: 44%; max-width: 520px; }
.chapter-number { display: block; width: 100px; height: 87px; object-fit: contain; margin-bottom: 26px; }
.feature h2 { font-size: clamp(34px,3.34vw,48px); line-height: 1.4; font-weight: 600; letter-spacing: -.035em; }
.feature-desc { font-size: clamp(18px,1.67vw,24px); line-height: 1.6; margin-top: 28px; color: #3c4240; }
.feature-desc span { display: block; }
.feature-dark .feature-desc { color: #becbc7; }
.site-footer { border-top: 1px solid #1a2c29; background: #080e0d; padding: 48px 24px 72px; }
.footer-inner { max-width: 1120px; margin: auto; display: flex; justify-content: space-between; gap: 32px; }
.contact p { color: var(--muted); font-size: 14px; margin-bottom: 4px; }
.contact a { display: inline-flex; align-items: center; min-height: 44px; font-size: 18px; overflow-wrap: anywhere; }
.legal-links { display: flex; gap: 24px; flex-wrap: wrap; }
.legal-links a { min-height: 44px; display: inline-flex; align-items: center; font-size: 15px; }
.legal-links a[aria-current] { text-decoration: underline; text-underline-offset: 6px; }
.copyright { font-size: 12px; line-height: 1.8; color: #99aaa4; margin-top: 12px; }
.vac-float { position: fixed; right: 20px; bottom: calc(20px + env(safe-area-inset-bottom,0px) + var(--vac-chat-bottom,0px)); z-index: 2147482999; display: flex; flex-direction: column; align-items: center; gap: 16px; }
.vac-chat { position: relative; flex: none; display: none; align-items: center; justify-content: center; width: 64px; height: 64px; margin: 0; padding: 0; border: 0; border-radius: 50%; background: var(--accent); color: #00372e; box-shadow: 0 4px 24px #0003; cursor: pointer; }
:root[data-vac-chat=ready] .vac-chat { display: flex; }
.vac-chat svg { width: 28px; height: 28px; }
.vac-chat-unread { position: absolute; top: -2px; right: -2px; min-width: 20px; height: 20px; padding: 0 6px; border-radius: 10px; background: #c6173e; color: #fff; font: 600 12px/20px system-ui,sans-serif; text-align: center; }
.vac-chat-unread:empty { display: none; }
.legal-page { background: #f5f6f4; color: #203a32; color-scheme: light; }
.legal-page .site-header,.legal-page .site-footer { color: var(--ink); color-scheme: dark; }
.legal-layout { max-width: 1168px; padding: 56px 24px 80px; margin: auto; display: grid; grid-template-columns: 220px minmax(0,1fr); gap: 28px 64px; align-items: start; }
.legal-heading { grid-column: 2; grid-row: 1; }
.legal-heading h1 { font-size: 40px; line-height: 1.4; letter-spacing: -.03em; }
.legal-toc { grid-column: 1; grid-row: 1 / 3; position: sticky; top: 96px; font-size: 15px; }
.legal-toc p { font-size: 13px; color: #53685f; margin-bottom: 12px; }
.legal-toc a { display: flex; align-items: center; min-height: 44px; line-height: 1.5; padding: 8px 0; overflow-wrap: anywhere; }
.legal-toc a:focus-visible { outline-color: #007967; }
.legal-content { grid-column: 2; max-width: 760px; min-width: 0; font-size: 17px; line-height: 1.95; overflow-wrap: anywhere; }
.legal-content h2 { font-size: 23px; line-height: 1.5; margin: 40px 0 16px; scroll-margin-top: 88px; }
.legal-content p { margin: 0 0 20px; }
.return-home { border-bottom: 1px solid #95aba2; display: inline-flex; align-items: center; gap: 24px; min-height: 48px; margin-top: 24px; color: var(--deep-accent); }
@media (hover:hover) and (pointer:fine) {
  .download:hover { filter: brightness(1.12); }
  .header-link:hover,.legal-links a:hover,.contact a:hover { color: var(--accent); }
  .chapter-rail a:hover::before { background: #00cdbd; width: 3px; }
  .legal-toc a:hover,.return-home:hover { color: var(--deep-accent); text-decoration: underline; text-underline-offset: 5px; }
}
@media (max-width: 1099px) {
  .chapter-rail { display: none; }
  .feature-copy { left: 40px; }
}
@media (max-width: 900px) {
  .hero { min-height: 680px; }
  .hero-media img,.hero-media video { object-position: center; transform: none; }
  .hero h1 { font-size: clamp(34px,8vw,58px); }
  .hero-content { padding-top: 40px; }
  .feature-stage { min-height: 680px; }
  .feature-copy { left: 0; right: 0; top: 64px; transform: none; width: auto; max-width: 680px; margin: auto; padding: 0 24px; text-align: center; }
  .chapter-number { display: none; }
  .feature h2 { font-size: 34px; }
  .feature-desc { font-size: 18px; line-height: 1.65; margin-top: 20px; }
  .feature-art { top: auto; height: 75%; }
  .footer-inner { flex-direction: column; gap: 24px; }
  .legal-layout { display: flex; flex-direction: column; gap: 28px; padding-top: 32px; }
  .legal-toc { position: static; width: 100%; border-bottom: 1px solid #ccd7d0; padding-bottom: 20px; }
  .legal-toc ul { display: flex; flex-wrap: wrap; gap: 0 24px; }
  .legal-content { max-width: none; }
  .legal-heading h1 { font-size: 34px; }
}
@media (max-width: 600px) {
  :root { --header-height: 56px; }
  .header-inner { padding: 0 16px; gap: 8px; }
  .brand img { width: 170px; }
  .header-link { margin-left: auto; font-size: 14px; gap: 2px; }
  .hero { min-height: 644px; }
  .hero h1 { font-size: clamp(32px,10.6vw,44px); }
  .hero-content { padding: 36px 24px 0; }
  .download-slot { margin-top: 20px; }
  .hero-media img,.hero-media video { object-position: center bottom; }
  .social-marks { bottom: 20px; gap: 22px; padding: 12px 20px; }
  .social-marks img { width: 26px; height: 26px; }
  .feature-copy { top: 64px; padding: 0 20px; }
  .feature h2 { font-size: clamp(28px,8.7vw,34px); }
  .feature-desc { font-size: clamp(16px,4.62vw,18px); }
  .site-footer { padding: 32px 24px 100px; }
  .legal-links { gap: 20px; }
  .legal-links a { font-size: 14px; }
  .legal-layout { padding: 28px 24px 56px; }
  .legal-content { font-size: 16px; }
  .legal-heading h1 { font-size: 32px; }
  .legal-content h2 { font-size: 22px; scroll-margin-top: 80px; }
}
@media (max-width: 359px) {
  .brand img { width: 158px; }
  .social-marks { gap: 16px; padding-inline: 16px; }
  .legal-links { gap: 16px; }
}
@media (prefers-reduced-motion: reduce) {
  .download:active { transform: none; }
  .download { transition: filter 150ms ease; }
}
@media (forced-colors: active) {
  .hero strong,.feature strong { background: none; color: CanvasText; }
}

/* Download remains visible; VAC owns verification and unavailable states. */
.hero { scroll-margin-top: var(--header-height); }
.download-note { margin-top: 12px; color: #b2c9c4; font-size: 13px; line-height: 1.6; }
.primary-nav { display: flex; align-items: center; gap: 28px; }
.primary-nav a { display: inline-flex; align-items: center; min-height: 44px; font-size: 14px; color: #c0d1cd; transition: color 150ms ease; }
.start-section,.help-section { scroll-margin-top: var(--header-height); padding: 96px 24px; }
.section-shell { max-width: 1120px; margin: auto; }
.start-section { background: #eff0f2; color: #203a32; color-scheme: light; }
.section-heading { display: flex; justify-content: space-between; align-items: flex-end; gap: 32px; }
.section-heading h2,.help-heading h2 { font-size: clamp(32px,3.4vw,46px); line-height: 1.35; font-weight: 600; letter-spacing: -.03em; }
.section-heading p,.help-heading p { font-size: 17px; line-height: 1.8; color: #53665e; }
.start-steps { list-style: none; padding: 0; margin: 52px 0 0; display: grid; grid-template-columns: repeat(3,minmax(0,1fr)); gap: 36px; }
.start-steps li { border-top: 1px solid #b5cdc5; padding-top: 24px; }
.step-number { display: block; color: #007d70; font-size: 26px; font-weight: 600; margin-bottom: 24px; }
.start-steps h3 { margin: 0 0 14px; font-size: 20px; line-height: 1.5; }
.start-steps p { font-size: 16px; line-height: 1.9; color: #4e635b; }
.start-steps a,.faq-answer a,.help-heading a { display: inline-flex; align-items: center; min-height: 44px; text-decoration: underline; text-underline-offset: 5px; margin-top: 16px; }
.start-steps a { color: #006d61; }
.help-section { background: #071311; }
.help-layout { display: grid; grid-template-columns: 1fr 1.5fr; gap: 64px; }
.help-heading p { color: #adbfba; margin-top: 24px; }
.help-heading a,.faq-answer a { color: #5fe4d0; }
.faq-list details { border-bottom: 1px solid #2c4540; scroll-margin-top: calc(var(--header-height) + 20px); }
.faq-list details:first-child { border-top: 1px solid #2c4540; }
.faq-list summary { padding: 24px 8px 24px 0; font-size: 19px; line-height: 1.6; cursor: pointer; }
.faq-list summary::marker { color: #5fe4d0; }
.faq-answer { padding: 0 22px 24px; color: #b5c8c2; font-size: 16px; line-height: 1.9; }
.faq-answer p + p { margin-top: 12px; }
.closing-section { padding: 52px 24px; background: #0b2823; }
.closing-inner { display: flex; justify-content: space-between; align-items: center; gap: 24px; }
.closing-inner h2 { font-size: clamp(26px,3vw,36px); font-weight: 500; }
.closing-inner a { display: inline-flex; align-items: center; justify-content: center; min-height: 52px; padding: 12px 24px; border: 1px solid #5fe4d0; border-radius: 4px; color: #78e5d2; }
@media (hover:hover) and (pointer:fine) { .primary-nav a:hover,.faq-list summary:hover { color: var(--accent); } .closing-inner a:hover { background: #123b33; } }
@media (max-width:900px) {
  .header-inner { gap: 32px; }
  .primary-nav { gap: 20px; }
  .start-section,.help-section { padding: 64px 24px; }
  .section-heading { align-items: flex-start; flex-direction: column; gap: 20px; }
  .start-steps { gap: 24px; }
  .help-layout { grid-template-columns: 1fr; gap: 36px; }
}
@media (max-width:600px) {
  .home-page { --header-height: 100px; }
  .home-page .header-inner { display: grid; grid-template-columns: 1fr; gap: 0; padding: 4px 24px; }
  .home-page .brand { min-height: 44px; }
  .primary-nav { gap: 24px; }
  .primary-nav a { font-size: 14px; min-height: 44px; }
  .start-steps { grid-template-columns: 1fr; gap: 32px; margin-top: 36px; }
  .step-number { margin-bottom: 12px; }
  .start-steps a { margin-top: 10px; }
  .faq-list summary { font-size: 17px; }
  .faq-answer { padding-left: 18px; padding-right: 0; }
  .closing-inner { align-items: flex-start; flex-direction: column; }
}

/* Client identity and controllable original intro. */
.hero-summary { margin: 10px auto 0; max-width: 660px; font-size: 17px; line-height: 1.8; color: #b8d1ca; }
.hero-summary span { display: inline-block; }
.hero-summary span + span { margin-left: .5em; }
.download [data-device-icon] { flex: none; width: 28px; height: 28px; object-fit: contain; filter: brightness(0); opacity: .8; }
.motion-control { position: absolute; left: 24px; bottom: 28px; z-index: 2; min-height: 44px; padding: 8px 14px; border: 1px solid #476f64; border-radius: 4px; background: #031b17db; color: #c5e6dc; cursor: pointer; font-size: 13px; }
@media (hover:hover) and (pointer:fine) { .motion-control:hover { border-color: var(--accent); color: var(--accent); } }
@media (max-width:900px) {
  .hero-media { top: 140px; -webkit-mask-image: linear-gradient(to bottom,transparent,#000 90px); mask-image: linear-gradient(to bottom,transparent,#000 90px); }
  .hero-summary { max-width: 540px; }
}
@media (max-width:600px) {
  .hero { min-height: 760px; }
  .hero-content { padding-top: 24px; }
  .hero-media { top: 84px; }
  .hero-summary { font-size: 15px; line-height: 1.75; margin-top: 8px; }
  .hero-summary span { display: block; }
  .hero-summary span + span { margin-left: 0; }
  .motion-control { bottom: 112px; }
}