@layer reset, tokens, base, components, composition, responsive, preferences;

@layer reset {
  *, *::before, *::after { box-sizing: border-box; }
  html { scroll-behavior: smooth; text-size-adjust: 100%; }
  body, h1, h2, h3, p, ol, ul, figure, figcaption { margin: 0; }
  img, svg { display: block; max-width: 100%; }
  button, input, textarea, select { font: inherit; }
  button, summary, a { -webkit-tap-highlight-color: transparent; }
  a { color: inherit; }
}

@layer tokens {
  :root {
    color-scheme: light;

    --md-ref-typeface-brand: ui-rounded, "SF Pro Rounded", "Segoe UI Variable Display", "Segoe UI", system-ui, -apple-system, BlinkMacSystemFont, sans-serif;
    --md-ref-typeface-plain: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", "Noto Sans", "PingFang SC", "Microsoft YaHei", sans-serif;
    --md-sys-typescale-display-line-height: 1.12;
    --md-sys-typescale-headline-line-height: 1.16;
    --md-sys-typescale-title-line-height: 1.2;

    --md-sys-color-primary: #006b68;
    --md-sys-color-on-primary: #ffffff;
    --md-sys-color-primary-container: #a8eee3;
    --md-sys-color-on-primary-container: #00201e;
    --md-sys-color-secondary: #77565a;
    --md-sys-color-on-secondary: #ffffff;
    --md-sys-color-secondary-container: #ffd9da;
    --md-sys-color-on-secondary-container: #2b1518;
    --md-sys-color-tertiary: #6b5a00;
    --md-sys-color-on-tertiary: #ffffff;
    --md-sys-color-tertiary-container: #ffe489;
    --md-sys-color-on-tertiary-container: #211b00;
    --md-sys-color-error: #ba1a1a;
    --md-sys-color-on-error: #ffffff;
    --md-sys-color-error-container: #ffdad6;
    --md-sys-color-on-error-container: #410002;
    --md-sys-color-surface: #fff8f5;
    --md-sys-color-on-surface: #201a19;
    --md-sys-color-on-surface-variant: #514744;
    --md-sys-color-surface-container-lowest: #ffffff;
    --md-sys-color-surface-container-low: #fff0ec;
    --md-sys-color-surface-container: #ffe8e2;
    --md-sys-color-surface-container-high: #ffddd5;
    --md-sys-color-surface-container-highest: #f6d2ca;
    --md-sys-color-surface-dim: #e6cbc4;
    --md-sys-color-surface-bright: #fff8f5;
    --md-sys-color-outline: #85736f;
    --md-sys-color-outline-variant: #d8c2bc;
    --md-sys-color-inverse-surface: #352a27;
    --md-sys-color-inverse-on-surface: #ffede8;
    --md-sys-color-inverse-primary: #83d8cf;
    --md-sys-color-scrim: rgba(0, 0, 0, .48);

    --md-sys-shape-corner-none: 0;
    --md-sys-shape-corner-extra-small: 4px;
    --md-sys-shape-corner-small: 8px;
    --md-sys-shape-corner-medium: 12px;
    --md-sys-shape-corner-large: 16px;
    --md-sys-shape-corner-large-increased: 20px;
    --md-sys-shape-corner-extra-large: 28px;
    --md-sys-shape-corner-extra-large-increased: 32px;
    --md-sys-shape-corner-extra-extra-large: 48px;
    --md-sys-shape-corner-full: 999px;

    --md-sys-spacing-1: 4px;
    --md-sys-spacing-2: 8px;
    --md-sys-spacing-3: 12px;
    --md-sys-spacing-4: 16px;
    --md-sys-spacing-5: 24px;
    --md-sys-spacing-6: 32px;
    --md-sys-spacing-7: 48px;
    --md-sys-spacing-8: 64px;
    --md-sys-spacing-9: 96px;
    --md-sys-spacing-10: 128px;

    --md-sys-motion-easing-emphasized: cubic-bezier(.2, 0, 0, 1);
    --md-sys-motion-easing-emphasized-decelerate: cubic-bezier(.05, .7, .1, 1);
    --md-sys-motion-easing-emphasized-accelerate: cubic-bezier(.3, 0, .8, .15);
    --md-sys-motion-easing-standard: cubic-bezier(.2, 0, 0, 1);
    --md-sys-motion-duration-short: 150ms;
    --md-sys-motion-duration-medium: 300ms;
    --md-sys-motion-duration-long: 500ms;
    --md-sys-motion-duration-hero: 760ms;

    --page-margin: 16px;
    --content-max: 1120px;
    --reading-max: 720px;
    --header-height: 72px;
  }

  :root[data-theme="dark"] {
    color-scheme: dark;
    --md-sys-color-primary: #83d8cf;
    --md-sys-color-on-primary: #003734;
    --md-sys-color-primary-container: #00514d;
    --md-sys-color-on-primary-container: #a8eee3;
    --md-sys-color-secondary: #e9bfc1;
    --md-sys-color-on-secondary: #45292d;
    --md-sys-color-secondary-container: #5d3d41;
    --md-sys-color-on-secondary-container: #ffd9da;
    --md-sys-color-tertiary: #e8ca5c;
    --md-sys-color-on-tertiary: #3b3000;
    --md-sys-color-tertiary-container: #554600;
    --md-sys-color-on-tertiary-container: #ffe489;
    --md-sys-color-error: #ffb4ab;
    --md-sys-color-on-error: #690005;
    --md-sys-color-error-container: #93000a;
    --md-sys-color-on-error-container: #ffdad6;
    --md-sys-color-surface: #171211;
    --md-sys-color-on-surface: #f6eeeb;
    --md-sys-color-on-surface-variant: #d5c2bc;
    --md-sys-color-surface-container-lowest: #100c0b;
    --md-sys-color-surface-container-low: #211a18;
    --md-sys-color-surface-container: #281f1d;
    --md-sys-color-surface-container-high: #342825;
    --md-sys-color-surface-container-highest: #40322f;
    --md-sys-color-surface-dim: #171211;
    --md-sys-color-surface-bright: #41322f;
    --md-sys-color-outline: #a18b84;
    --md-sys-color-outline-variant: #554640;
    --md-sys-color-inverse-surface: #f6eeeb;
    --md-sys-color-inverse-on-surface: #352a27;
    --md-sys-color-inverse-primary: #006b68;
    --md-sys-color-scrim: rgba(0, 0, 0, .72);
  }

  :lang(zh-Hant) {
    --md-ref-typeface-brand: ui-rounded, "SF Pro Rounded", "PingFang TC", "Microsoft JhengHei", system-ui, sans-serif;
    --md-ref-typeface-plain: system-ui, -apple-system, BlinkMacSystemFont, "PingFang TC", "Microsoft JhengHei", sans-serif;
  }
}

@layer base {
  html { background: var(--md-sys-color-surface); }

  body {
    min-width: 320px;
    min-height: 100vh;
    overflow-x: hidden;
    background: var(--md-sys-color-surface);
    color: var(--md-sys-color-on-surface);
    font-family: var(--md-ref-typeface-plain);
    font-size: 16px;
    line-height: 1.5;
  }

  ::selection {
    background: var(--md-sys-color-primary-container);
    color: var(--md-sys-color-on-primary-container);
  }

  :focus-visible {
    outline: 3px solid var(--md-sys-color-primary);
    outline-offset: 3px;
  }

  h1, h2, h3 {
    font-family: var(--md-ref-typeface-brand);
    text-wrap: balance;
  }

  h2 {
    font-size: clamp(2rem, 4.6vw, 3.75rem);
    font-weight: 760;
    letter-spacing: 0;
    line-height: var(--md-sys-typescale-headline-line-height);
  }

  h3 {
    font-size: clamp(1.4rem, 2.4vw, 2rem);
    font-weight: 700;
    letter-spacing: 0;
    line-height: var(--md-sys-typescale-title-line-height);
  }

  p { text-wrap: pretty; }

  .eyebrow {
    color: var(--md-sys-color-primary);
    font-size: .75rem;
    font-weight: 760;
    letter-spacing: .14em;
    line-height: 1.3;
    text-transform: uppercase;
  }

  .icon { width: 20px; height: 20px; flex: 0 0 auto; }

  .skip-link {
    position: fixed;
    inset: var(--md-sys-spacing-3) auto auto var(--md-sys-spacing-3);
    z-index: 1000;
    translate: 0 -160%;
    border-radius: var(--md-sys-shape-corner-full);
    background: var(--md-sys-color-inverse-surface);
    color: var(--md-sys-color-inverse-on-surface);
    padding: 12px 20px;
    text-decoration: none;
    transition: translate var(--md-sys-motion-duration-short) var(--md-sys-motion-easing-standard);
  }

  .skip-link:focus { translate: 0; }
}

@layer components {
  .site-header {
    position: sticky;
    inset-block-start: 0;
    z-index: 100;
    min-height: var(--header-height);
    display: flex;
    align-items: center;
    gap: var(--md-sys-spacing-5);
    padding: 8px var(--page-margin);
    background: color-mix(in srgb, var(--md-sys-color-surface) 92%, transparent);
    border-block-end: 1px solid color-mix(in srgb, var(--md-sys-color-outline-variant) 62%, transparent);
  }

  @supports (backdrop-filter: blur(16px)) {
    .site-header { backdrop-filter: blur(16px) saturate(1.15); }
  }

  .brand, .footer-brand {
    display: inline-flex;
    align-items: center;
    gap: 10px;
    min-width: max-content;
    color: var(--md-sys-color-on-surface);
    text-decoration: none;
  }

  .brand img, .footer-brand img { border-radius: 50%; }
  .brand span, .footer-brand span { display: grid; line-height: 1.05; }
  .brand b, .footer-brand b { font-family: var(--md-ref-typeface-brand); font-size: .98rem; font-weight: 750; }
  .brand small, .footer-brand small { margin-top: 4px; color: var(--md-sys-color-on-surface-variant); font-size: .67rem; }

  .primary-nav {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 4px;
    margin-inline: auto;
  }

  .primary-nav a {
    min-height: 48px;
    display: inline-flex;
    align-items: center;
    border-radius: var(--md-sys-shape-corner-full);
    padding-inline: 14px;
    color: var(--md-sys-color-on-surface-variant);
    font-size: .875rem;
    font-weight: 650;
    text-decoration: none;
    transition: background var(--md-sys-motion-duration-short), color var(--md-sys-motion-duration-short);
  }

  .primary-nav a:hover {
    background: var(--md-sys-color-surface-container);
    color: var(--md-sys-color-on-surface);
  }

  .header-actions { display: flex; align-items: center; gap: 4px; }

  .icon-button {
    width: 48px;
    height: 48px;
    display: inline-grid;
    place-items: center;
    border: 0;
    border-radius: var(--md-sys-shape-corner-full);
    background: transparent;
    color: var(--md-sys-color-on-surface-variant);
    cursor: pointer;
    list-style: none;
    transition: background var(--md-sys-motion-duration-short), color var(--md-sys-motion-duration-short), transform var(--md-sys-motion-duration-short);
  }

  .icon-button::-webkit-details-marker { display: none; }
  .icon-button:hover { background: var(--md-sys-color-surface-container); color: var(--md-sys-color-on-surface); }
  .icon-button:active { transform: scale(.94); }

  .language-menu { position: relative; }
  .language-menu[open] > summary { background: var(--md-sys-color-secondary-container); color: var(--md-sys-color-on-secondary-container); }

  .language-popover {
    position: absolute;
    inset: calc(100% + 8px) 0 auto auto;
    width: 208px;
    padding: 8px;
    border: 1px solid var(--md-sys-color-outline-variant);
    border-radius: var(--md-sys-shape-corner-large-increased);
    background: var(--md-sys-color-surface-container-high);
    color: var(--md-sys-color-on-surface);
    box-shadow: 0 8px 24px rgba(0, 0, 0, .12);
  }

  .language-popover a {
    min-height: 48px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 8px;
    border-radius: var(--md-sys-shape-corner-medium);
    padding-inline: 14px;
    text-decoration: none;
  }

  .language-popover a:hover { background: var(--md-sys-color-surface-container-highest); }
  .language-check { width: 18px; height: 18px; opacity: 0; }
  .language-popover [aria-current="page"] { background: var(--md-sys-color-secondary-container); color: var(--md-sys-color-on-secondary-container); font-weight: 700; }
  .language-popover [aria-current="page"] .language-check { opacity: 1; }

  .button {
    min-height: 48px;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
    border: 0;
    border-radius: var(--md-sys-shape-corner-full);
    padding: 12px 22px;
    font-size: .9rem;
    font-weight: 740;
    line-height: 1.2;
    text-decoration: none;
    transition: background var(--md-sys-motion-duration-short), color var(--md-sys-motion-duration-short), transform var(--md-sys-motion-duration-short), border-radius var(--md-sys-motion-duration-medium) var(--md-sys-motion-easing-emphasized);
  }

  .button:hover { transform: translateY(-2px); }
  .button:active { transform: translateY(0) scale(.97); border-radius: var(--md-sys-shape-corner-large); }
  .button--primary { background: var(--md-sys-color-primary); color: var(--md-sys-color-on-primary); }
  .button--primary:hover { background: color-mix(in srgb, var(--md-sys-color-primary) 88%, var(--md-sys-color-on-primary)); }
  .button--tonal { background: var(--md-sys-color-secondary-container); color: var(--md-sys-color-on-secondary-container); }
  .button--large { min-height: 56px; padding-inline: 28px; font-size: 1rem; }
  .button--header { background: var(--md-sys-color-primary); color: var(--md-sys-color-on-primary); padding-inline: 18px; }

  .text-link {
    width: fit-content;
    min-height: 48px;
    display: inline-flex;
    align-items: center;
    gap: 10px;
    color: var(--md-sys-color-primary);
    font-weight: 740;
    text-decoration-thickness: 1.5px;
    text-underline-offset: 5px;
  }

  .text-link .icon { transition: transform var(--md-sys-motion-duration-short); }
  .text-link:hover .icon { transform: translateX(4px); }

  .product-shot[data-shot]:not([src]) { visibility: hidden; }
  .product-shot { width: 100%; height: auto; object-fit: contain; }

  .channel-dialog {
    width: min(680px, calc(100% - 32px));
    max-height: calc(100dvh - 32px);
    overflow: auto;
    overscroll-behavior: contain;
    border: 0;
    border-radius: var(--md-sys-shape-corner-extra-large-increased);
    padding: 0;
    background: var(--md-sys-color-surface-container-high);
    color: var(--md-sys-color-on-surface);
  }

  .channel-dialog::backdrop { background: var(--md-sys-color-scrim); }

  .channel-dialog[open] { animation: dialog-in var(--md-sys-motion-duration-long) var(--md-sys-motion-easing-emphasized-decelerate); }

  @keyframes dialog-in {
    from { opacity: 0; transform: translateY(24px) scale(.94); border-radius: var(--md-sys-shape-corner-extra-extra-large); }
    to { opacity: 1; transform: none; border-radius: var(--md-sys-shape-corner-extra-large-increased); }
  }

  .dialog-shell { padding: 28px; }
  .dialog-heading { display: flex; align-items: flex-start; justify-content: space-between; gap: 24px; }
  .dialog-heading h2 { margin-top: 8px; font-size: clamp(1.8rem, 4vw, 2.6rem); line-height: var(--md-sys-typescale-headline-line-height); }
  .dialog-intro { max-width: 52ch; margin-top: 16px; color: var(--md-sys-color-on-surface-variant); }

  .channel-list { display: grid; gap: 12px; margin-top: 24px; }

  .channel-item {
    min-height: 88px;
    display: grid;
    grid-template-columns: 112px minmax(0, 1fr) 24px;
    align-items: center;
    gap: 18px;
    border: 1px solid var(--md-sys-color-outline-variant);
    border-radius: var(--md-sys-shape-corner-large-increased);
    padding: 16px 18px;
    background: var(--md-sys-color-surface-container-lowest);
    color: var(--md-sys-color-on-surface);
    text-decoration: none;
    transition: background var(--md-sys-motion-duration-short), border-color var(--md-sys-motion-duration-short), transform var(--md-sys-motion-duration-short), border-radius var(--md-sys-motion-duration-medium) var(--md-sys-motion-easing-emphasized);
  }

  .channel-item:hover {
    border-color: var(--md-sys-color-primary);
    background: var(--md-sys-color-primary-container);
    color: var(--md-sys-color-on-primary-container);
    transform: translateY(-2px);
  }

  .channel-item:active { transform: scale(.985); border-radius: var(--md-sys-shape-corner-medium); }
  .channel-mark { width: 64px; height: 56px; display: grid; place-items: center; border-radius: var(--md-sys-shape-corner-large); background: var(--md-sys-color-secondary-container); color: var(--md-sys-color-on-secondary-container); }
  .play-badge { width: 112px; height: auto; }
  .channel-copy { display: grid; gap: 4px; }
  .channel-copy b { font-family: var(--md-ref-typeface-brand); font-size: 1.05rem; }
  .channel-copy small { color: var(--md-sys-color-on-surface-variant); font-size: .82rem; }
  .channel-item:hover .channel-copy small { color: inherit; }
  .channel-arrow { display: grid; place-items: center; }
}

@layer composition {
  main { display: block; }

  .section[id] { scroll-margin-top: calc(var(--header-height) + 16px); }

  .hero {
    position: relative;
    min-height: calc(100vh - var(--header-height) - 48px);
    min-height: calc(100svh - var(--header-height) - 48px);
    display: grid;
    grid-template-columns: minmax(0, 5fr) minmax(420px, 7fr);
    align-items: center;
    gap: clamp(24px, 5vw, 80px);
    padding: clamp(56px, 5vw, 72px) max(var(--page-margin), calc((100vw - 1440px) / 2));
    overflow: hidden;
    background: var(--md-sys-color-surface-container-low);
    isolation: isolate;
  }

  .hero-copy { position: relative; z-index: 4; max-width: 620px; }

  .hero h1 {
    margin-top: 14px;
    font-size: clamp(3rem, 6.5vw, 5.75rem);
    font-weight: 820;
    letter-spacing: 0;
    line-height: var(--md-sys-typescale-display-line-height);
  }

  .hero h1 span {
    display: block;
    margin-top: .25em;
    color: var(--md-sys-color-on-surface-variant);
    font-size: .44em;
    font-weight: 680;
    letter-spacing: 0;
    line-height: var(--md-sys-typescale-title-line-height);
  }

  .hero-intro { max-width: 55ch; margin-top: 28px; color: var(--md-sys-color-on-surface-variant); font-size: clamp(1.04rem, 2vw, 1.25rem); line-height: 1.6; }
  .hero-actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 32px; }

  .connection-device {
    overflow: visible;
    border: 1px solid var(--md-sys-color-outline-variant);
    background: var(--md-sys-color-surface-container-lowest);
  }

  .section {
    width: min(calc(100% - 2 * var(--page-margin)), var(--content-max));
    margin-inline: auto;
    padding-block: clamp(88px, 12vw, 168px);
  }

  .section-heading { max-width: var(--reading-max); }
  .section-heading h2 { margin-top: 0; }
  .section-heading > p:last-child { max-width: 58ch; margin-top: 24px; color: var(--md-sys-color-on-surface-variant); font-size: clamp(1rem, 2vw, 1.18rem); }
  .section-heading--wide { max-width: 900px; }

  .connection-device { padding: 6px; border: 0; border-radius: var(--md-sys-shape-corner-extra-large); }
  .connection-device .product-shot { border-radius: 0; }

  .connection-steps { display: grid; gap: 10px; padding: 0; list-style: none; }

  .connection-steps li {
    min-height: 112px;
    display: grid;
    grid-template-columns: 54px 1fr;
    align-items: center;
    gap: 18px;
    border: 0;
    border-radius: var(--md-sys-shape-corner-large-increased);
    padding: 16px 18px;
    background: color-mix(in srgb, var(--md-sys-color-surface-container-lowest) 72%, transparent);
  }

  .connection-steps li:last-child { border: 0; }
  .step-number { color: var(--md-sys-color-primary); font-family: var(--md-ref-typeface-brand); font-size: 1.2rem; font-weight: 800; }
  .connection-steps li > span:last-child { display: grid; gap: 6px; }
  .connection-steps b { font-family: var(--md-ref-typeface-brand); font-size: 1.2rem; }
  .connection-steps small { color: var(--md-sys-color-on-surface-variant); font-size: .88rem; line-height: 1.45; }

  .clipboard-note {
    position: static;
    grid-column: 3;
    width: 100%;
    display: grid;
    grid-template-columns: 64px 1fr;
    gap: 18px;
    border-radius: var(--md-sys-shape-corner-extra-large-increased);
    padding: 28px;
    background: var(--md-sys-color-tertiary-container);
    color: var(--md-sys-color-on-tertiary-container);
  }

  .note-icon { width: 64px; height: 64px; display: grid; place-items: center; border-radius: 50%; background: var(--md-sys-color-secondary); color: var(--md-sys-color-on-secondary); }
  .note-icon .icon { width: 28px; height: 28px; }
  .clipboard-note h3 { font-size: 1.55rem; }
  .clipboard-note p { margin-top: 10px; opacity: .82; }

  .tools-section { padding-top: 80px; }

  .trust-section {
    display: grid;
    grid-template-columns: minmax(220px, 320px) minmax(0, 1fr) minmax(260px, 360px);
    align-items: center;
    gap: clamp(32px, 6vw, 80px);
  }

  .trust-icon { width: 64px; height: 64px; }
  .trust-copy h2 { margin-top: 14px; }
  .trust-copy > p:not(.eyebrow), .support-copy p { margin-top: 22px; color: var(--md-sys-color-on-surface-variant); }
  .trust-copy .text-link, .support-copy .text-link { margin-top: 22px; }
  .support-copy { border-inline-start: 1px solid var(--md-sys-color-outline-variant); padding-inline-start: clamp(24px, 4vw, 48px); }
  .support-icon { width: 64px; height: 64px; display: grid; place-items: center; margin-bottom: 24px; border-radius: 50%; background: var(--md-sys-color-tertiary-container); color: var(--md-sys-color-on-tertiary-container); }
  .support-icon .icon { width: 30px; height: 30px; }
  .support-copy h3 { font-size: 1.8rem; }

  .faq-section { display: grid; grid-template-columns: minmax(260px, 4fr) minmax(0, 7fr); gap: clamp(40px, 8vw, 112px); }
  .faq-list { border-block-start: 1px solid var(--md-sys-color-outline-variant); }
  .faq-list details { border-block-end: 1px solid var(--md-sys-color-outline-variant); }
  .faq-list summary { min-height: 80px; display: flex; align-items: center; justify-content: space-between; gap: 24px; cursor: pointer; font-family: var(--md-ref-typeface-brand); font-size: 1.1rem; font-weight: 720; list-style: none; }
  .faq-list summary::-webkit-details-marker { display: none; }
  .faq-list summary .icon { transition: transform var(--md-sys-motion-duration-medium) var(--md-sys-motion-easing-emphasized); }
  .faq-list details[open] summary .icon { transform: rotate(90deg); }
  .faq-list details p { max-width: 62ch; padding: 0 48px 24px 0; color: var(--md-sys-color-on-surface-variant); }

  .final-cta {
    width: min(calc(100% - 2 * var(--page-margin)), 1320px);
    min-height: 380px;
    display: grid;
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    gap: 40px;
    margin: 24px auto 96px;
    border-radius: var(--md-sys-shape-corner-extra-extra-large);
    padding: clamp(40px, 7vw, 96px);
    background: var(--md-sys-color-primary-container);
    color: var(--md-sys-color-on-primary-container);
  }

  .final-cta h2 { max-width: 820px; margin-top: 14px; }
  .final-cta p:not(.eyebrow) { max-width: 54ch; margin-top: 22px; opacity: .78; }

  .site-footer {
    min-height: 192px;
    display: grid;
    grid-template-columns: auto 1fr auto;
    align-items: center;
    gap: 40px;
    padding: 40px max(var(--page-margin), calc((100vw - 1320px) / 2));
    background: var(--md-sys-color-surface-container);
  }

  .site-footer nav { display: flex; flex-wrap: wrap; justify-content: center; gap: 8px 24px; }
  .site-footer nav a, .icp { min-height: 44px; display: inline-flex; align-items: center; color: var(--md-sys-color-on-surface-variant); font-size: .83rem; text-underline-offset: 4px; }
  .reveal { transition: opacity var(--md-sys-motion-duration-long) var(--md-sys-motion-easing-emphasized-decelerate), transform var(--md-sys-motion-duration-long) var(--md-sys-motion-easing-emphasized-decelerate); }
  .reveal.is-ready { opacity: 0; transform: translateY(28px); }
  .reveal.is-visible { opacity: 1; transform: none; }

  .download-main { min-height: calc(100vh - var(--header-height)); }
  .download-hero {
    min-height: 70vh;
    display: grid;
    grid-template-columns: minmax(300px, 5fr) minmax(0, 7fr);
    align-items: center;
    gap: clamp(40px, 8vw, 128px);
    padding: clamp(72px, 10vw, 144px) max(var(--page-margin), calc((100vw - 1120px) / 2));
    background: var(--md-sys-color-surface);
  }

  .download-visual {
    position: relative;
    width: min(100%, 430px);
    min-height: 470px;
    display: grid;
    grid-template-rows: 1fr auto;
    align-items: end;
    gap: 24px;
    border-radius: var(--md-sys-shape-corner-extra-extra-large);
    padding: clamp(28px, 5vw, 48px);
    background: var(--md-sys-color-tertiary-container);
    color: var(--md-sys-color-on-tertiary-container);
  }

  .download-mark { width: 184px; height: 184px; display: grid; place-items: center; align-self: center; justify-self: center; border-radius: 34% 66% 58% 42% / 46% 38% 62% 54%; background: var(--md-sys-color-primary); color: var(--md-sys-color-on-primary); transform: rotate(-4deg); }
  .download-mark-icon { width: 88px; height: 88px; transform: rotate(4deg); }
  .not-found-code { font-size: 3.6rem; font-weight: 850; line-height: 1; transform: rotate(4deg); }
  .download-copy { max-width: 650px; }
  .download-copy h1 { margin-top: 16px; font-size: clamp(3rem, 6.2vw, 5.5rem); font-weight: 820; letter-spacing: 0; line-height: var(--md-sys-typescale-display-line-height); }
  .download-copy > p:not(.eyebrow) { max-width: 52ch; margin-top: 28px; color: var(--md-sys-color-on-surface-variant); font-size: 1.12rem; }
  .download-copy .button { margin-top: 32px; }

  .direct-channels {
    width: min(calc(100% - 2 * var(--page-margin)), 920px);
    display: grid;
    grid-template-columns: 1fr 1.6fr;
    gap: 56px;
    margin-inline: auto;
    padding-block: 112px 144px;
  }

  .direct-channels h2 { margin-top: 12px; font-size: clamp(2.1rem, 4vw, 3.5rem); }
  .direct-channels .channel-list { margin-top: 0; }

  .legal-main { padding: clamp(56px, 8vw, 112px) var(--page-margin) 128px; }
  .legal-document { max-width: 820px; margin-inline: auto; }
  .legal-document h1 { font-size: clamp(2.5rem, 5.5vw, 4.5rem); font-weight: 800; letter-spacing: 0; line-height: var(--md-sys-typescale-display-line-height); }
  .legal-document h2 { margin-top: 56px; font-size: clamp(1.65rem, 3.2vw, 2.3rem); letter-spacing: 0; line-height: var(--md-sys-typescale-title-line-height); }
  .legal-document h3 { margin-top: 36px; font-size: 1.3rem; }
  .legal-document p, .legal-document li { color: var(--md-sys-color-on-surface-variant); line-height: 1.75; }
  .legal-document p { margin-top: 18px; }
  .legal-document ul, .legal-document ol { padding-inline-start: 1.35rem; }
  .legal-document a { color: var(--md-sys-color-primary); text-underline-offset: 4px; }
  .legal-links { display: flex; flex-wrap: wrap; gap: 12px; }
}

@layer responsive {
  @media (min-width: 600px) {
    :root { --page-margin: 24px; }
  }

  @media (min-width: 1600px) {
    :root { --content-max: 1240px; }
    .hero { grid-template-columns: minmax(0, 5fr) minmax(560px, 7fr); }
  }

  @media (max-width: 1199px) {
    .primary-nav { display: none; }
    .site-header { justify-content: space-between; }
    .connection-steps { grid-column: 1 / -1; grid-template-columns: repeat(3, 1fr); margin-top: 36px; }
    .connection-steps li { grid-template-columns: 44px 1fr; padding: 16px 20px; }
    .clipboard-note { grid-column: 1 / -1; width: min(620px, 100%); margin-top: 8px; }
  }

  @media (max-width: 839px) {
    .header-actions .button--header { width: 48px; padding: 0; }
    .header-actions .button--header span { display: none; }
    .hero { min-height: auto; grid-template-columns: 1fr; padding-block: 72px 96px; }
    .hero-copy { max-width: 680px; }
    .connection-steps { grid-template-columns: 1fr; }
    .connection-steps li { min-height: 88px; }
    .clipboard-note { width: 100%; }

    .trust-section { grid-template-columns: minmax(180px, 260px) 1fr; }
    .support-copy { grid-column: 1 / -1; border-inline-start: 0; border-block-start: 1px solid var(--md-sys-color-outline-variant); padding: 40px 0 0; }
    .faq-section { grid-template-columns: 1fr; }
    .final-cta { min-height: auto; grid-template-columns: 1fr; align-items: start; gap: 32px; }
    .final-cta .button { align-self: start; justify-self: start; }
    .site-footer { grid-template-columns: 1fr 1fr; }
    .site-footer nav { justify-content: flex-end; }
    .icp { grid-column: 1 / -1; justify-self: center; }

    .download-hero { grid-template-columns: 1fr; }
    .download-visual { width: min(74vw, 430px); justify-self: center; }
    .direct-channels { grid-template-columns: 1fr; }
  }

  @media (max-width: 599px) {
    :root { --header-height: 64px; }
    .site-header { min-height: var(--header-height); gap: 8px; }
    .brand img { width: 40px; height: 40px; }
    .brand small { display: none; }
    .brand b { font-size: .88rem; }
    .header-actions { margin-inline-start: auto; }
    .header-actions .icon-button { width: 44px; height: 44px; }
    .header-actions .button--header { width: 44px; height: 44px; display: inline-flex; padding: 0; }

    .hero { padding-top: 56px; }
    .hero h1 { font-size: clamp(2.6rem, 12vw, 4.25rem); }
    .hero-actions { display: grid; }
    .hero-actions .button { width: 100%; }

    .section { padding-block: 88px; }
    .connection-device { padding: 4px; border-radius: 20px; }
    .connection-device .product-shot { border-radius: 0; }
    .connection-steps { margin-top: 16px; }
    .connection-steps li { padding-inline: 4px; }
    .clipboard-note { grid-template-columns: 48px 1fr; padding: 24px; border-radius: var(--md-sys-shape-corner-extra-large); }
    .note-icon { width: 48px; height: 48px; }
    .clipboard-note h3 { font-size: 1.3rem; }

    .trust-section { grid-template-columns: 1fr; }
    .support-copy { grid-column: auto; }
    .faq-list summary { min-height: 72px; }
    .final-cta { width: calc(100% - 2 * var(--page-margin)); margin-bottom: 24px; border-radius: var(--md-sys-shape-corner-extra-extra-large); padding-block: 48px 56px; }

    .site-footer { grid-template-columns: 1fr; padding-bottom: calc(40px + env(safe-area-inset-bottom, 0px)); text-align: center; }
    .footer-brand, .site-footer nav, .icp { justify-self: center; }
    .site-footer nav { justify-content: center; }
    .icp { grid-column: auto; }

    .download-hero { padding-block: 64px 88px; }
    .download-visual { width: min(100%, 380px); min-height: 410px; }
    .download-copy h1 { font-size: clamp(2.75rem, 12vw, 4.2rem); }
    .direct-channels { padding-block: 80px 112px; }
    .channel-item { grid-template-columns: 92px minmax(0, 1fr) 20px; gap: 12px; padding-inline: 14px; }
    .play-badge { width: 92px; }
    .channel-mark { width: 56px; }
    .dialog-shell { padding: 22px; }
    .channel-dialog { max-height: calc(100dvh - 16px); }
  }
}

@layer preferences {
  @media (prefers-reduced-motion: reduce) {
    html { scroll-behavior: auto; }
    *, *::before, *::after { animation-duration: .001ms !important; animation-iteration-count: 1 !important; transition-duration: .001ms !important; scroll-behavior: auto !important; }
    .reveal, .reveal.is-ready { opacity: 1; transform: none; }
  }

  @media (prefers-contrast: more) {
    :root { --md-sys-color-outline-variant: var(--md-sys-color-outline); }
    .button, .icon-button, .channel-item, .connection-device { border: 2px solid currentColor; }
  }

  @media (forced-colors: active) {
    * { forced-color-adjust: auto; }
    .button, .icon-button, .channel-item, .connection-device { border: 1px solid ButtonText; }
  }

  @media print {
    .site-header, .channel-dialog, .hero-actions, .final-cta, .language-menu { display: none !important; }
    body { background: white; color: black; }
    .hero, .section, .trust-section, .faq-section { display: block; min-height: 0; padding: 24px 0; background: white; color: black; }
    .reveal, .reveal.is-ready { opacity: 1; transform: none; }
  }
}

@layer expressive-overrides {
  .hero {
    grid-template-columns: minmax(360px, .9fr) minmax(0, 1.1fr);
    gap: clamp(16px, 2vw, 32px);
    min-height: min(680px, calc(100svh - var(--header-height) - 160px));
    padding-block: 24px;
    background: var(--md-sys-color-surface);
  }

  .hero-copy {
    width: min(100%, 600px);
    max-width: none;
    align-self: stretch;
    display: flex;
    flex-direction: column;
    justify-content: center;
    justify-self: end;
    padding: clamp(28px, 3vw, 40px);
    border-radius: var(--md-sys-shape-corner-extra-extra-large);
    background: var(--md-sys-color-surface-container);
  }
  .hero h1 { margin-top: 0; max-width: 9ch; font-size: clamp(2.85rem, 5.25vw, 5rem); line-height: var(--md-sys-typescale-display-line-height); }
  .hero h1 span { margin-top: .28em; font-size: .38em; line-height: 1.22; }
  .hero-intro { max-width: 48ch; margin-top: 24px; font-size: clamp(1rem, 1.7vw, 1.16rem); line-height: 1.62; }
  .hero-actions { margin-top: 28px; }

  .hero-overview-pane {
    display: grid;
    justify-items: center;
    justify-self: start;
    align-self: center;
    width: min(100%, 760px);
    min-width: 0;
    margin: 0;
    padding: 16px;
    border-radius: var(--md-sys-shape-corner-extra-extra-large);
    background: var(--md-sys-color-surface-container-low);
    overflow: hidden;
  }

  .hero-overview-pane picture { width: min(100%, 720px); }

  .hero-overview-image {
    width: 100%;
    height: auto;
    aspect-ratio: 16 / 9;
    object-fit: contain;
    border-radius: var(--md-sys-shape-corner-extra-large-increased);
  }

  .hero-overview-pane figcaption,
  .connection-device figcaption,
  .capability-visual figcaption {
    margin-top: 10px;
    color: var(--md-sys-color-on-surface-variant);
    font-size: .74rem;
    line-height: 1.4;
  }

  .hero-overview-pane figcaption { width: min(100%, 720px); padding-inline: 8px; }

  .connection-section {
    padding-top: clamp(24px, 2vw, 40px);
    padding-bottom: clamp(56px, 6vw, 80px);
  }

  .tools-section { padding-top: 0; }

  .trust-section,
  .faq-section { padding-block: clamp(72px, 8vw, 112px); }

  .connection-transition {
    display: grid;
    grid-template-columns: minmax(0, .78fr) minmax(0, 1.22fr);
    align-items: center;
    gap: clamp(24px, 4vw, 64px);
    padding: clamp(24px, 2vw, 32px);
    border-radius: var(--md-sys-shape-corner-extra-extra-large);
    background: var(--md-sys-color-surface-container-low);
  }

  .connection-transition .section-heading { max-width: 36ch; }
  .connection-transition .section-heading h2 { margin-top: 0; }
  .connection-transition .section-heading > p:last-child { margin-top: 18px; }
  .connection-transition .connection-steps { grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 8px; margin: 0; }
  .connection-transition .connection-steps li {
    min-height: 136px;
    grid-template-columns: 1fr;
    align-content: center;
    gap: 12px;
    padding: 20px;
    border-radius: 0;
    background: transparent;
  }
  .connection-transition .connection-steps li + li { border-inline-start: 1px solid var(--md-sys-color-outline-variant); }
  .connection-transition .connection-steps li > span:last-child { gap: 6px; }
  .connection-transition .connection-steps b { font-size: 1.05rem; }
  .connection-transition .connection-steps small { font-size: .84rem; }

  .connection-steps { align-self: center; gap: 10px; }
  .connection-steps li { min-height: 104px; grid-template-columns: 56px minmax(0, 1fr); border-radius: var(--md-sys-shape-corner-large-increased); padding: 16px; background: var(--md-sys-color-surface-container); }
  .connection-steps li > span:last-child { gap: 5px; }
  .connection-steps b { font-size: 1.12rem; }
  .connection-steps small { line-height: 1.48; }

  .connection-detail {
    min-width: 0;
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    align-items: start;
    gap: 16px;
    padding: clamp(20px, 3vw, 32px);
    border-radius: var(--md-sys-shape-corner-extra-extra-large);
    background: var(--md-sys-color-secondary-container);
    color: var(--md-sys-color-on-secondary-container);
    margin-top: 24px;
  }

  .connection-device {
    width: min(100%, 380px);
    min-width: 0;
    justify-self: center;
    margin: 0;
    padding: 0;
    border: 0;
    border-radius: 0;
    background: transparent;
  }
  .connection-device .product-shot { border-radius: 0; }
  .connection-device figcaption { padding-inline: 8px; color: inherit; opacity: .72; }
  .clipboard-note { grid-column: 1 / -1; width: 100%; margin: 0; padding: 24px; border-radius: var(--md-sys-shape-corner-extra-large-increased); }

  .capability-layout {
    display: grid;
    grid-template-columns: minmax(300px, .82fr) minmax(0, 1.18fr);
    align-items: start;
    gap: clamp(24px, 4vw, 56px);
    margin-top: 0;
  }

  .capability-guide {
    min-width: 0;
    padding: clamp(24px, 3vw, 40px);
    border-radius: var(--md-sys-shape-corner-extra-extra-large);
    background: var(--md-sys-color-surface-container-low);
  }
  .capability-guide .section-heading { max-width: none; }
  .capability-guide h2 { font-size: clamp(2.25rem, 3vw, 3rem); line-height: var(--md-sys-typescale-headline-line-height); text-wrap: pretty; }
  .capability-nav { align-self: start; margin-top: 32px; padding: 0; background: transparent; }
  .capability-nav ul { display: grid; gap: 4px; padding: 0; list-style: none; }
  .capability-option {
    width: 100%;
    min-height: 64px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 16px;
    border: 0;
    border-radius: var(--md-sys-shape-corner-large);
    padding: 12px 16px;
    background: transparent;
    color: var(--md-sys-color-on-surface-variant);
    cursor: pointer;
    font-family: var(--md-ref-typeface-brand);
    font-size: 1rem;
    font-weight: 700;
    text-align: start;
    transition: background var(--md-sys-motion-duration-short), color var(--md-sys-motion-duration-short), border-radius var(--md-sys-motion-duration-medium) var(--md-sys-motion-easing-emphasized);
  }
  .capability-option:hover { background: var(--md-sys-color-surface-container); color: var(--md-sys-color-on-surface); }
  .capability-option[aria-selected="true"] {
    background: var(--md-sys-color-tertiary-container);
    color: var(--md-sys-color-on-tertiary-container);
    border-radius: var(--md-sys-shape-corner-large);
    box-shadow: inset 4px 0 var(--md-sys-color-tertiary);
  }
  .capability-option .icon { transition: transform var(--md-sys-motion-duration-short) var(--md-sys-motion-easing-standard); }
  .capability-option[aria-selected="true"] .icon { transform: translateX(3px); }

  .capability-detail {
    min-width: 0;
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(220px, 320px);
    align-items: start;
    gap: clamp(24px, 4vw, 56px);
    padding: clamp(24px, 4vw, 48px);
    border-radius: var(--md-sys-shape-corner-extra-extra-large);
    background: var(--md-sys-color-primary-container);
    color: var(--md-sys-color-on-primary-container);
  }
  .capability-copy { max-width: 34ch; }
  .capability-copy h3 { font-size: clamp(1.5rem, 2vw, 1.9rem); text-wrap: pretty; }
  .capability-copy p { margin-top: 16px; line-height: 1.58; opacity: .8; }
  .capability-visual { min-width: 0; width: min(100%, 320px); margin: 0; justify-self: center; padding: 0; border: 0; border-radius: 0; background: transparent; }
  .capability-visual .product-shot { border-radius: 0; }
  .capability-visual figcaption { padding-inline: 8px; color: var(--md-sys-color-on-surface-variant); }
  .capability-noscript { display: none; }

  .trust-section { grid-template-columns: minmax(0, 1.2fr) minmax(280px, .8fr); gap: clamp(32px, 8vw, 112px); }
  .source-tile { width: fit-content; display: inline-flex; align-items: center; gap: 12px; min-height: 56px; padding: 8px 16px 8px 8px; border-radius: var(--md-sys-shape-corner-full); background: var(--md-sys-color-surface-container); }
  .source-icon { width: 40px; height: 40px; display: grid; place-items: center; border-radius: 50%; background: var(--md-sys-color-primary); color: var(--md-sys-color-on-primary); }
  .source-icon .icon { width: 20px; height: 20px; }
  .source-tile > b { font-family: var(--md-ref-typeface-brand); }
  .trust-copy h2 { margin-top: 22px; }
  .support-copy { border-inline-start: 1px solid var(--md-sys-color-outline-variant); padding-inline-start: clamp(24px, 4vw, 48px); }
  .support-icon { margin-bottom: 20px; }

  .final-cta h2 { margin-top: 0; }

  .download-visual { min-height: 420px; grid-template-rows: 1fr auto; }
  .download-copy h1 { font-size: clamp(2.75rem, 5.5vw, 5rem); }
  .direct-channels { grid-template-columns: minmax(0, .68fr) minmax(0, 1.32fr); }
  .direct-channels > div:first-child > p { margin-top: 18px; color: var(--md-sys-color-on-surface-variant); }

  @media (max-width: 1199px) {
    .hero { grid-template-columns: minmax(320px, .9fr) minmax(0, 1.1fr); }
    .capability-layout { gap: 28px; }
    .connection-transition { grid-template-columns: minmax(0, .72fr) minmax(0, 1.28fr); gap: 28px; }
  }

  @media (max-width: 839px) {
    .hero { min-height: auto; grid-template-columns: 1fr; padding-block: 64px 88px; }
    .hero-copy { width: 100%; max-width: 680px; justify-self: center; }
    .hero-overview-pane { order: 2; width: 100%; justify-self: center; }
    .capability-layout { grid-template-columns: 1fr; }
    .connection-transition { grid-template-columns: 1fr; gap: 24px; }
    .connection-transition .connection-steps { grid-template-columns: 1fr; }
    .connection-transition .connection-steps li { min-height: 88px; grid-template-columns: 48px minmax(0, 1fr); align-content: center; align-items: center; padding: 16px 0; }
    .connection-transition .connection-steps li + li { border-inline-start: 0; border-block-start: 1px solid var(--md-sys-color-outline-variant); }
    .connection-steps { order: 1; display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); }
    .connection-detail { order: 2; }
    .capability-nav { order: 1; }
    .capability-detail { order: 2; }
    .trust-section { grid-template-columns: 1fr; }
    .support-copy { border-inline-start: 0; border-block-start: 1px solid var(--md-sys-color-outline-variant); padding: 32px 0 0; }
  }

  @media (max-width: 599px) {
    .hero { padding-block: 32px 24px; }
    .hero-copy { padding: 24px 20px; }
    .hero h1 { font-size: clamp(2.6rem, 11vw, 4rem); }
    .hero-actions {
      grid-template-columns: minmax(0, 1.06fr) minmax(0, .94fr);
      gap: 10px;
    }
    .hero-actions .button { min-width: 0; gap: 8px; padding-inline: 10px; font-size: .88rem; }
    .hero-overview-pane { display: none; }
    .connection-section { padding-block: 24px 88px; }
    .connection-transition { margin-inline: -8px; padding: 24px 20px; border-radius: var(--md-sys-shape-corner-extra-large-increased); }
    .connection-transition .connection-steps { grid-template-columns: 1fr; gap: 8px; }
    .connection-transition .connection-steps li { grid-template-columns: 44px minmax(0, 1fr); gap: 12px; padding-inline: 4px; }
    .connection-transition .connection-steps b { font-size: 1.05rem; }
    .connection-detail { margin-top: 16px; }
    .capability-layout { margin-top: 0; }
    .connection-steps { grid-template-columns: 1fr; }
    .connection-steps li { min-height: 84px; }
    .connection-detail { grid-template-columns: repeat(2, minmax(0, 1fr)); padding: 16px; border-radius: var(--md-sys-shape-corner-extra-large-increased); }
    .clipboard-note { padding: 20px; }
    .capability-detail { grid-template-columns: 1fr; padding: 24px; }
    .capability-guide { padding: 24px 20px; }
    .capability-copy { max-width: none; }
    .capability-visual { width: min(78vw, 320px); }
    .source-tile { max-width: 100%; }
    .download-visual { min-height: 360px; }
    .direct-channels { grid-template-columns: 1fr; }
  }
}