:root {
  color-scheme: light dark;
  --canvas: #f8f8f8;
  --ink: #222222;
  --muted: #646464;
  --line: #dedede;
  --accent: #222222;
  --glass: #ffffffb8;
  --glass-edge: #ffffff;
  --focus: #222222;
  --dialog-surface: #fafafaf2;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  background: var(--canvas);
  color: var(--ink);
  -webkit-text-size-adjust: 100%;
}

@media (prefers-color-scheme: dark) {
  :root {
    --canvas: #101010;
    --ink: #f2f2f2;
    --muted: #ababab;
    --line: #303030;
    --accent: #f2f2f2;
    --glass: #292929cc;
    --glass-edge: #494949;
    --focus: #f2f2f2;
    --dialog-surface: #202020f5;
  }
}

* { box-sizing: border-box; }
html { scroll-padding-top: 2rem; }
body { margin: 0; min-width: 280px; }
a { color: inherit; text-underline-offset: .25em; }
a:hover { text-decoration: underline; }
a:focus-visible, button:focus-visible, summary:focus-visible { outline: 2px solid var(--focus); outline-offset: 5px; border-radius: 4px; }
main:focus { outline: none; }
img { display: block; max-width: 100%; height: auto; }
figure, p, h1, h2 { margin: 0; }
::selection { background: var(--ink); color: var(--canvas); }
.page-width { width: min(1040px, calc(100% - 96px)); margin-inline: auto; }
.skip-link { position: absolute; z-index: 2; top: 1rem; left: 1rem; padding: 1rem; background: var(--canvas); transform: translateY(-200%); }
.skip-link:focus { transform: none; }
.site-header { display: flex; align-items: center; justify-content: space-between; gap: 1rem; min-height: 112px; }
.brand { display: inline-flex; align-items: center; gap: .7rem; min-height: 44px; text-decoration: none; font-size: 1.125rem; font-weight: 600; letter-spacing: -.035em; }
.brand img { width: 36px; height: 36px; border-radius: 9px; }
.quiet-link { display: inline-flex; align-items: center; gap: .6rem; min-height: 44px; font-size: .875rem; color: var(--muted); text-decoration: none; }
.hero { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.1fr); align-items: center; gap: 2.5rem; padding-block: 64px 112px; }
h1 { font-size: clamp(3.25rem, 6.1vw, 5.4rem); line-height: 1.04; font-weight: 550; letter-spacing: -.065em; }
.hero h1 { font-size: clamp(1.75rem, 5.6vw, 3.8rem); }
.hero-title-line { display: block; white-space: nowrap; }
.hero h1 span { color: var(--accent); }
.intro { max-width: 24rem; margin-top: 1.75rem; font-size: 1.125rem; line-height: 1.65; color: var(--muted); }
.primary-action { display: inline-flex; justify-content: center; align-items: center; gap: 1.4rem; min-height: 50px; margin-top: 2rem; padding: .8rem 1.35rem; border: 1px solid var(--glass-edge); border-radius: 999px; background: var(--glass); -webkit-backdrop-filter: blur(16px); backdrop-filter: blur(16px); font-size: .9375rem; font-weight: 600; text-decoration: none; box-shadow: 0 3px 12px #0000000a; }
.primary-action:hover { border-color: var(--accent); text-decoration: none; }
.hero-visual { justify-self: center; width: min(100%, 520px); }
/* Fixed black alpha is used only for shadows, in both appearances. */
.app-screen { display: block; width: 100%; height: auto; background: transparent; filter: drop-shadow(0 16px 24px #00000018); }
/* Transparency is encoded in the media; no clipping, masks or rounded wrapper. */
.device-video { aspect-ratio: 702 / 1440; overflow: visible; }
.feature { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1.1fr); gap: clamp(2rem, 5vw, 4rem); align-items: center; padding-block: 100px; }
.feature h2, .community-section h2, .faq h2 { font-size: clamp(2.75rem, 4.7vw, 4rem); line-height: 1.08; font-weight: 550; letter-spacing: -.055em; }
.feature-copy p { max-width: 23rem; margin-top: 1.5rem; font-size: 1.0625rem; line-height: 1.7; color: var(--muted); }
.feature-collect { grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr); }
.feature-collect .feature-copy { grid-column: 2; grid-row: 1; }
.feature-visual { grid-column: 1; grid-row: 1; width: 100%; justify-self: center; }
.screen-pair { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); align-items: start; gap: 16px; }
.screen-pair .app-screen + .app-screen { margin-top: 100px; }
.community-grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: clamp(2rem, 6vw, 6rem); padding-block: 100px; }
.community-section { display: flex; flex-direction: column; min-width: 0; }
.community-section .feature-copy { flex: 1; text-align: center; }
.community-section .feature-copy p { margin-inline: auto; max-width: 21rem; }
.community-visual { width: min(100%, 280px); margin: 40px auto 0; }
.faq { display: grid; grid-template-columns: minmax(0, .7fr) minmax(0, 1.3fr); align-items: start; gap: clamp(2rem, 6vw, 6rem); padding-block: 64px 100px; }
.faq-list { min-width: 0; border-top: 1px solid var(--line); }
.faq details { border-bottom: 1px solid var(--line); }
.faq summary { display: flex; align-items: center; justify-content: space-between; gap: 1rem; min-height: 64px; padding-block: 1.25rem; color: var(--ink); font-size: 1.0625rem; font-weight: 600; line-height: 1.5; letter-spacing: -.02em; list-style: none; cursor: pointer; }
.faq summary::-webkit-details-marker { display: none; }
.faq summary span { min-width: 0; overflow-wrap: anywhere; }
.faq summary svg { flex-shrink: 0; }
.faq details[open] .faq-plus { display: none; }
.faq p { padding: 0 2.25rem 1.25rem 0; color: var(--muted); font-size: 1rem; line-height: 1.75; overflow-wrap: anywhere; }
.faq a { color: var(--ink); }
.site-footer { display: flex; align-items: center; justify-content: space-between; gap: 2rem; padding-block: 32px 40px; font-size: .8125rem; line-height: 1.6; color: var(--muted); }
.attribution { margin-top: .25rem; font-size: .75rem; }
.site-footer nav { display: flex; gap: 1.5rem; flex-shrink: 0; }
.site-footer a { display: inline-flex; align-items: center; min-height: 44px; text-decoration: none; }
.site-footer a:hover { text-decoration: underline; }
.site-footer p a { display: inline; }
.policy { max-width: 680px; padding-block: 64px 80px; }
.policy h1 { font-size: clamp(2.75rem, 6vw, 4rem); margin-bottom: 3.5rem; }
.policy section { margin-top: 2.5rem; scroll-margin-top: 2rem; }
.policy h2 { font-size: 1.125rem; line-height: 1.5; font-weight: 600; letter-spacing: -.02em; margin-bottom: .875rem; }
.policy p { color: var(--muted); font-size: 1rem; line-height: 1.8; overflow-wrap: anywhere; }
.policy p + p { margin-top: 1rem; }
.policy a, .policy strong { color: var(--ink); }

.beta-dialog { width: min(400px, calc(100% - 32px)); max-height: calc(100dvh - 32px); margin: auto; padding: 24px; border: 1px solid var(--glass-edge); border-radius: 28px; color: var(--ink); background: var(--dialog-surface); -webkit-backdrop-filter: blur(24px); backdrop-filter: blur(24px); box-shadow: 0 24px 80px #00000030; }
.beta-dialog[open] { display: grid; grid-template-rows: auto minmax(0, 1fr) auto; gap: 20px; }
/* Fixed black alpha is an intentional dimming layer in both appearances. */
.beta-dialog::backdrop { background: #00000045; -webkit-backdrop-filter: blur(6px); backdrop-filter: blur(6px); }
.beta-header { display: flex; align-items: center; justify-content: space-between; gap: 1rem; }
.beta-header h2 { font-size: 1.5rem; font-weight: 550; letter-spacing: -.04em; }
.beta-header form { margin: 0; }
.icon-button { display: grid; place-items: center; width: 44px; height: 44px; padding: 0; border: 1px solid var(--line); border-radius: 50%; background: var(--glass); color: var(--ink); cursor: pointer; }
.icon-button:hover { border-color: var(--ink); }
.beta-body { overflow: auto; overscroll-behavior: contain; }
.beta-body p { color: var(--muted); font-size: .9375rem; line-height: 1.6; }
.beta-code { margin-top: 24px; text-align: center; }
/* Intentional black-on-white QR artwork preserves scan contrast in both themes. */
.beta-code img { width: min(100%, 224px); height: auto; margin-inline: auto; border-radius: 16px; }
.beta-action { width: 100%; margin: 0; }

@media (max-width: 760px) {
  .page-width { width: calc(100% - 40px); }
  .site-header { min-height: 88px; }
  .hero { grid-template-columns: 1fr; gap: 3rem; padding-block: 40px 64px; text-align: center; }
  .hero h1 { font-size: clamp(1.75rem, 10vw, 3.8rem); }
  .intro { margin-inline: auto; }
  .community-grid { grid-template-columns: 1fr; gap: 64px; padding-block: 64px; }
  .feature { grid-template-columns: 1fr; gap: 2.5rem; padding-block: 64px; }
  .feature-copy { text-align: center; }
  .feature-copy p { margin-inline: auto; }
  .feature-collect .feature-copy, .feature-visual { grid-column: auto; grid-row: auto; }
  .screen-pair { width: min(100%, 520px); justify-self: center; gap: 12px; }
  .screen-pair .app-screen + .app-screen { margin-top: 64px; }
  .faq { grid-template-columns: 1fr; gap: 2rem; padding-block: 64px; }
  .site-footer { flex-direction: column; align-items: flex-start; gap: .75rem; padding-block: 24px; }
  .policy { padding-block: 40px 64px; }
}

@media (prefers-reduced-transparency: reduce) {
  .primary-action { background: var(--canvas); -webkit-backdrop-filter: none; backdrop-filter: none; border-color: var(--line); }
  .beta-dialog { background: var(--canvas); -webkit-backdrop-filter: none; backdrop-filter: none; }
  .beta-dialog::backdrop { -webkit-backdrop-filter: none; backdrop-filter: none; }
}

@media (prefers-contrast: more) {
  :root { --muted: var(--ink); --line: var(--ink); --glass-edge: var(--ink); }
}

@media (forced-colors: active) {
  :root { --canvas: Canvas; --ink: CanvasText; --muted: CanvasText; --accent: LinkText; --line: CanvasText; --glass: Canvas; --glass-edge: ButtonText; --focus: Highlight; }
  .primary-action { -webkit-backdrop-filter: none; backdrop-filter: none; }
  .beta-dialog { background: Canvas; -webkit-backdrop-filter: none; backdrop-filter: none; }
  .beta-code img { forced-color-adjust: none; }
}

@media print {
  .site-header, .site-footer, .skip-link, .primary-action, .beta-dialog[open] { display: none; }
  :root { --canvas: Canvas; --ink: CanvasText; --muted: CanvasText; --accent: CanvasText; }
  .page-width { width: 100%; }
  .policy { max-width: none; padding: 0; }
  .policy section { break-inside: avoid; }
  .app-screen { filter: none; }
}