@layer reset, tokens, base, components, responsive, motion;

@layer reset {
  *, *::before, *::after { box-sizing: border-box; }
  html { scroll-behavior: smooth; }
  body, h1, h2, h3, p, figure, blockquote, ul, ol { margin: 0; }
  ul, ol { padding: 0; }
  img, svg { display: block; max-width: 100%; }
  button, a { font: inherit; }
  button { color: inherit; }
}

@layer tokens {
  :root {
    color-scheme: light;
    --canvas: oklch(.995 .003 150);
    --surface: oklch(.967 .009 150);
    --surface-strong: oklch(.925 .018 150);
    --ink: oklch(.205 .025 150);
    --ink-2: oklch(.405 .027 150);
    --ink-3: oklch(.545 .022 150);
    --line: oklch(.865 .014 150);
    --line-strong: oklch(.72 .025 150);
    --brand: oklch(.405 .105 153);
    --brand-dark: oklch(.31 .085 153);
    --brand-soft: oklch(.93 .037 153);
    --mint: oklch(.775 .115 153);
    --amber: oklch(.71 .13 73);
    --night: oklch(.118 .018 150);
    --night-2: oklch(.17 .025 150);
    --night-ink: oklch(.965 .009 150);
    --night-muted: oklch(.76 .02 150);
    --shadow: 0 35px 90px oklch(.19 .04 150 / .17), 0 10px 28px oklch(.19 .03 150 / .1);
    --shadow-small: 0 10px 30px oklch(.19 .03 150 / .09);
    --radius-s: .55rem;
    --radius-m: .9rem;
    --radius-l: 1.4rem;
    --container: min(1180px, calc(100vw - 40px));
    --ease: cubic-bezier(.16, 1, .3, 1);
    --fast: 180ms;
    --normal: 480ms;
  }
}

@layer base {
  html { background: var(--canvas); }
  body {
    min-width: 320px;
    overflow-x: clip;
    color: var(--ink);
    background: var(--canvas);
    font-family: -apple-system, BlinkMacSystemFont, "SF Pro Text", "PingFang SC", "Microsoft YaHei UI", "Segoe UI", sans-serif;
    font-size: 1rem;
    line-height: 1.65;
    -webkit-font-smoothing: antialiased;
    text-rendering: optimizeLegibility;
  }
  a { color: inherit; text-decoration: none; }
  a:focus-visible, button:focus-visible, summary:focus-visible { outline: 3px solid color-mix(in oklch, var(--brand) 62%, white); outline-offset: 4px; }
  h1, h2, h3 { text-wrap: balance; }
  h1 { font-size: clamp(3.5rem, 8vw, 6rem); line-height: .94; letter-spacing: -.04em; }
  h2 { font-size: clamp(2.45rem, 5.2vw, 4.65rem); line-height: 1.01; letter-spacing: -.038em; }
  h3 { font-size: clamp(1.15rem, 2vw, 1.45rem); line-height: 1.24; letter-spacing: -.018em; }
  p { text-wrap: pretty; }
  svg { width: 1.2em; height: 1.2em; flex: 0 0 auto; }
  .section { width: var(--container); margin-inline: auto; padding-block: clamp(6.5rem, 12vw, 10.5rem); }
  .lead { color: var(--brand); font-size: .78rem; font-weight: 760; letter-spacing: .08em; }
  .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; inset: 12px auto auto 12px; z-index: 60; padding: 10px 14px; color: white; border-radius: var(--radius-s); background: var(--brand); transform: translateY(-150%); }
  .skip-link:focus { transform: translateY(0); }
}

@layer components {
  .site-header {
    position: relative;
    z-index: 30;
    display: flex;
    align-items: center;
    width: var(--container);
    min-height: 80px;
    margin-inline: auto;
  }
  .brand { display: inline-flex; align-items: center; gap: .65rem; font-size: 1.08rem; font-weight: 780; letter-spacing: -.025em; }
  .brand img { border-radius: 9px; box-shadow: 0 3px 12px oklch(.1 0 0 / .18); }
  .site-nav { display: flex; align-items: center; gap: 1.7rem; margin-left: auto; margin-right: 1.4rem; color: var(--ink-2); font-size: .88rem; font-weight: 650; }
  .site-nav a { transition: color var(--fast) var(--ease); }
  .site-nav a:hover { color: var(--ink); }
  .language-link { display: inline-flex; align-items: center; gap: .4rem; }
  .menu-toggle { display: none; }
  .button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: .55rem;
    min-height: 48px;
    padding: .8rem 1.18rem;
    border: 1px solid transparent;
    border-radius: var(--radius-s);
    font-size: .91rem;
    font-weight: 730;
    line-height: 1;
    cursor: pointer;
    transition: color var(--fast) var(--ease), background var(--fast) var(--ease), border-color var(--fast) var(--ease), transform var(--fast) var(--ease), box-shadow var(--fast) var(--ease);
  }
  .button:hover { transform: translateY(-2px); }
  .button:active { transform: translateY(0) scale(.98); }
  .button-small { min-height: 40px; padding-inline: 1rem; color: white; background: var(--brand); }
  .button-primary { color: white; background: var(--brand); box-shadow: 0 12px 30px oklch(.405 .105 153 / .24); }
  .button-primary:hover, .button-small:hover { background: var(--brand-dark); }
  .button-secondary { border-color: var(--line-strong); background: white; }
  .button-secondary:hover { border-color: var(--ink-2); box-shadow: var(--shadow-small); }

  .hero { width: var(--container); margin-inline: auto; padding: clamp(4rem, 8vw, 7.5rem) 0 2rem; }
  .hero-copy { max-width: 970px; margin-inline: auto; text-align: center; }
  .hero h1 { margin-top: 1rem; }
  .hero h1 em { color: var(--brand); font-style: normal; }
  .hero-body { max-width: 730px; margin: 1.75rem auto 0; color: var(--ink-2); font-size: clamp(1.05rem, 2vw, 1.24rem); }
  .hero-actions { display: flex; flex-wrap: wrap; justify-content: center; gap: .8rem; margin-top: 2rem; }
  .hero-note { margin-top: .9rem; color: var(--ink-3); font-size: .8rem; }
  .product-stage { position: relative; max-width: 1140px; margin: clamp(4rem, 8vw, 7rem) auto 0; }
  .stage-aura { position: absolute; inset: -15% 10% 5%; z-index: -1; background: radial-gradient(circle, oklch(.74 .105 153 / .25), transparent 67%); filter: blur(34px); }
  .product-window, .workflow-visual { position: relative; overflow: hidden; border: 1px solid var(--line-strong); border-radius: var(--radius-m); background: white; box-shadow: var(--shadow); }
  .product-media { display: block; width: 100%; height: auto; background: var(--night); }
  .window-bar { display: flex; align-items: center; gap: .38rem; height: 36px; padding: 0 12px; color: var(--ink-3); border-bottom: 1px solid var(--line); background: var(--surface); font-size: .68rem; }
  .window-bar i { width: 8px; height: 8px; border-radius: 50%; background: var(--line-strong); }
  .window-bar i:first-child { background: oklch(.67 .18 28); }
  .window-bar i:nth-child(2) { background: oklch(.78 .15 83); }
  .window-bar i:nth-child(3) { background: oklch(.68 .14 145); }
  .window-bar span { margin-left: .55rem; }
  .media-placeholder { position: relative; min-height: 620px; overflow: hidden; color: var(--ink-2); background: linear-gradient(135deg, oklch(.955 .015 150), oklch(.985 .005 150)); }
  .placeholder-grid { position: absolute; inset: 0; opacity: .45; background-image: linear-gradient(var(--line) 1px, transparent 1px), linear-gradient(90deg, var(--line) 1px, transparent 1px); background-size: 44px 44px; mask-image: linear-gradient(to bottom, black, transparent 82%); }
  .placeholder-app { position: absolute; inset: 9% 7% 24%; display: grid; grid-template-columns: 8% 24% 43% 25%; overflow: hidden; border: 1px solid var(--line-strong); border-radius: 9px; background: white; box-shadow: var(--shadow-small); }
  .placeholder-app span { border-right: 1px solid var(--line); background-image: repeating-linear-gradient(to bottom, transparent 0 22px, var(--surface-strong) 22px 27px); }
  .placeholder-app span:last-child { border: 0; }
  .placeholder-sidebar { background-color: var(--night) !important; }
  .placeholder-reader { background-color: oklch(.99 .003 150); }
  .placeholder-assistant { background-color: var(--surface); }
  .placeholder-copy { position: absolute; inset: auto 0 0; display: grid; justify-items: center; gap: .3rem; padding: 2rem; color: var(--ink-2); text-align: center; background: linear-gradient(transparent, var(--canvas) 26%); }
  .placeholder-copy svg { width: 30px; height: 30px; margin-bottom: .2rem; color: var(--brand); }
  .placeholder-copy strong { color: var(--ink); font-size: .95rem; }
  .placeholder-copy span { font-size: .76rem; }
  .demo-focus { position: absolute; z-index: 3; opacity: 0; border: 2px solid var(--brand); border-radius: 10px; box-shadow: 0 0 0 999px oklch(.12 .02 150 / .08), 0 0 0 7px oklch(.64 .11 153 / .16); pointer-events: none; transform: scale(.97); transition: opacity var(--normal) var(--ease), transform var(--normal) var(--ease); }
  .demo-focus.is-active { opacity: 1; transform: scale(1); }
  .focus-0 { left: 8%; top: 15%; width: 26%; height: 56%; }
  .focus-1 { left: 34%; top: 15%; width: 41%; height: 56%; }
  .focus-2 { right: 7%; top: 15%; width: 24%; height: 56%; }
  .demo-controls { display: flex; justify-content: center; gap: .5rem; margin-top: 1.25rem; }
  .demo-step { display: inline-flex; align-items: center; gap: .55rem; min-height: 44px; padding: .55rem .8rem; color: var(--ink-3); border: 0; border-radius: 999px; background: transparent; cursor: pointer; }
  .demo-step span { display: grid; place-items: center; width: 24px; height: 24px; border: 1px solid var(--line); border-radius: 50%; font-size: .65rem; }
  .demo-step.is-active { color: var(--brand); background: var(--brand-soft); }
  .proof-strip { display: flex; flex-wrap: wrap; justify-content: center; gap: 1rem 2.5rem; width: var(--container); margin: 4rem auto 0; padding: 1.4rem 0; color: var(--ink-2); border-block: 1px solid var(--line); font-size: .8rem; font-weight: 650; }
  .proof-strip span { display: inline-flex; align-items: center; gap: .45rem; }
  .proof-strip svg { color: var(--brand); }

  .problem-heading { display: grid; grid-template-columns: .55fr 1fr; gap: 1rem 7vw; }
  .problem-heading .lead { grid-column: 1; }
  .problem-heading h2 { grid-column: 1 / -1; max-width: 980px; }
  .problem-heading > p:last-child { grid-column: 2; max-width: 650px; color: var(--ink-2); font-size: 1.08rem; }
  .problem-list { display: grid; grid-template-columns: repeat(3, 1fr); margin-top: 5rem; border-block: 1px solid var(--line); list-style: none; }
  .problem-list li { min-height: 250px; padding: 1.6rem 2rem 2rem 0; }
  .problem-list li + li { padding-left: 2rem; border-left: 1px solid var(--line); }
  .problem-list span { color: var(--brand); font-size: .7rem; }
  .problem-list h3 { margin-top: 3rem; }
  .problem-list p { margin-top: .8rem; color: var(--ink-2); font-size: .9rem; }

  .workflow { --workflow-step: 0; color: var(--night-ink); background: var(--night); }
  .workflow .section { padding-block: clamp(6.5rem, 11vw, 9rem); }
  .workflow-intro { padding-bottom: 3rem !important; }
  .workflow .lead { color: var(--mint); }
  .workflow-intro h2 { max-width: 920px; margin-top: 1.1rem; }
  .workflow-intro > p:last-child { max-width: 650px; margin-top: 1.5rem; color: var(--night-muted); font-size: 1.08rem; }
  .workflow-story { display: grid; grid-template-columns: minmax(0, 1.25fr) minmax(340px, .75fr); gap: clamp(2rem, 6vw, 5rem); align-items: start; padding-top: 0 !important; }
  .workflow-visual { position: sticky; top: 32px; box-shadow: none; border-color: oklch(.35 .025 150); background: var(--night-2); }
  .workflow-visual .window-bar { color: var(--night-muted); border-color: oklch(.32 .025 150); background: var(--night-2); }
  .workflow-media { min-height: 0; background: var(--night); }
  .workflow-media .placeholder-grid { opacity: .15; }
  .workflow-media .placeholder-copy { color: var(--night-muted); background: linear-gradient(transparent, var(--night) 30%); }
  .workflow-media .placeholder-copy strong { color: var(--night-ink); }
  .workflow-signal { position: absolute; inset: 14% 6% 25%; display: grid; grid-template-columns: repeat(4, 1fr); pointer-events: none; }
  .workflow-signal span { border: 2px solid transparent; transition: border-color var(--normal) var(--ease), background var(--normal) var(--ease); }
  .workflow-signal span.is-active { border-color: var(--mint); background: oklch(.7 .1 153 / .08); box-shadow: inset 0 0 36px oklch(.7 .1 153 / .12); }
  .workflow-steps { border-top: 1px solid oklch(.32 .025 150); }
  .workflow-steps button { display: grid; gap: .55rem; width: 100%; min-height: 190px; padding: 1.45rem 0; color: var(--night-muted); border: 0; border-bottom: 1px solid oklch(.32 .025 150); background: transparent; text-align: left; cursor: pointer; }
  .workflow-steps button > span { font-size: .7rem; }
  .workflow-steps small { color: var(--mint); font-weight: 700; }
  .workflow-steps strong { color: var(--night-ink); font-size: 1.25rem; }
  .workflow-steps em { font-style: normal; font-size: .9rem; }
  .workflow-steps button[aria-selected="true"] { color: var(--night-ink); }
  .workflow-steps button[aria-selected="true"] strong { color: var(--mint); }

  .why { position: relative; min-height: min(900px, 90vh); overflow: hidden; padding: clamp(7rem, 15vw, 13rem) 20px; color: var(--night-ink); background: var(--brand-dark); }
  .why::before { content: ""; position: absolute; inset: 0; background: radial-gradient(circle at 82% 20%, oklch(.65 .13 153 / .3), transparent 34%), linear-gradient(135deg, transparent 0 55%, oklch(.2 .06 153 / .28)); }
  .why-inner { position: relative; z-index: 2; width: min(980px, 100%); margin-inline: auto; }
  .why .lead { color: oklch(.85 .09 153); }
  .why h2 { margin-top: 1.2rem; }
  .why-body { max-width: 660px; margin: 2rem 0 0 auto; color: oklch(.86 .025 153); font-size: 1.08rem; }
  .why blockquote { max-width: 770px; margin-top: clamp(5rem, 10vw, 9rem); padding-top: 2rem; border-top: 1px solid oklch(.8 .06 153 / .35); }
  .why blockquote svg { width: 30px; height: 30px; color: var(--amber); }
  .why blockquote p { margin-top: 1.2rem; font-size: clamp(1.55rem, 3vw, 2.5rem); line-height: 1.35; letter-spacing: -.025em; }
  .why cite { display: block; margin-top: 1.4rem; color: oklch(.8 .04 153); font-size: .78rem; font-style: normal; }
  .why-orbit { position: absolute; right: -18vw; bottom: -28vw; width: 64vw; height: 64vw; border: 1px solid oklch(.8 .08 153 / .18); border-radius: 50%; }
  .why-orbit::before, .why-orbit::after { content: ""; position: absolute; inset: 18%; border: inherit; border-radius: inherit; }
  .why-orbit::after { inset: 38%; }
  .why-orbit i { position: absolute; width: 9px; height: 9px; border-radius: 50%; background: var(--amber); box-shadow: 0 0 24px var(--amber); }
  .why-orbit i:first-child { left: 18%; top: 13%; }.why-orbit i:nth-child(2) { right: 12%; top: 46%; }.why-orbit i:nth-child(3) { left: 34%; bottom: 4%; }

  .local { display: grid; grid-template-columns: minmax(0, .85fr) minmax(430px, 1.15fr); gap: clamp(3rem, 8vw, 8rem); }
  .local-copy h2 { margin-top: 1.1rem; }
  .local-copy > p:last-of-type { margin-top: 1.5rem; color: var(--ink-2); font-size: 1.05rem; }
  .local-links { display: flex; flex-wrap: wrap; gap: 1.5rem; margin-top: 2rem; }
  .local-links a { display: inline-flex; align-items: center; gap: .5rem; padding-bottom: .2rem; border-bottom: 1px solid var(--line-strong); color: var(--brand); font-weight: 680; }
  .local-system { align-self: center; overflow: hidden; border: 1px solid var(--line); border-radius: var(--radius-l); background: radial-gradient(circle at 50% 30%, var(--brand-soft), white 62%); box-shadow: var(--shadow-small); }
  .local-system svg { width: 100%; height: auto; }
  .map-line { fill: none; stroke: var(--brand); stroke-width: 2; stroke-dasharray: 7 8; stroke-dashoffset: 160; }
  .line-b { stroke: var(--amber); }
  .map-node rect { fill: white; stroke: var(--line-strong); }
  .map-node.primary rect { fill: var(--brand); stroke: var(--brand); }
  .map-node.provider rect { fill: var(--surface); }
  .map-node text { fill: var(--ink); font: 650 14px system-ui; text-anchor: middle; }
  .map-node text + text { fill: var(--ink-3); font-size: 11px; font-weight: 450; }
  .map-node.primary text { fill: white; }
  .local-points { grid-column: 1 / -1; display: grid; grid-template-columns: repeat(3, 1fr); margin-top: 1rem; border-block: 1px solid var(--line); }
  .local-points article { display: flex; gap: 1rem; min-height: 170px; padding: 1.6rem 2rem 1.6rem 0; }
  .local-points article + article { padding-left: 2rem; border-left: 1px solid var(--line); }
  .local-points svg { margin-top: .2rem; color: var(--brand); }
  .local-points p { margin-top: .6rem; color: var(--ink-2); font-size: .88rem; }

  .evidence-heading { max-width: 900px; }
  .evidence-heading h2 { margin-top: 1.1rem; }
  .evidence-heading > p:last-child { max-width: 680px; margin-top: 1.5rem; color: var(--ink-2); }
  .evidence-list { margin-top: 6rem; }
  .evidence-item { display: grid; grid-template-columns: minmax(260px, .72fr) minmax(0, 1.28fr); gap: clamp(2rem, 7vw, 7rem); align-items: center; padding-block: clamp(3rem, 7vw, 6rem); border-top: 1px solid var(--line); }
  .evidence-item.reverse { grid-template-columns: minmax(0, 1.28fr) minmax(260px, .72fr); }
  .evidence-item.reverse .evidence-copy { order: 2; }
  .evidence-copy > span { color: var(--brand); font-size: .72rem; font-weight: 730; }
  .evidence-copy h3 { margin-top: 1rem; font-size: clamp(1.65rem, 3.2vw, 2.7rem); }
  .evidence-copy p { margin-top: 1rem; color: var(--ink-2); }
  .evidence-media { position: relative; width: 100%; overflow: hidden; padding: 8px; border: 1px solid var(--line); border-radius: var(--radius-l); background: var(--surface); box-shadow: var(--shadow-small); cursor: zoom-in; text-align: left; }
  .evidence-media .product-media { min-height: 390px; object-fit: cover; object-position: center top; border-radius: calc(var(--radius-l) - 7px); }
  .evidence-media > span { position: absolute; right: 22px; bottom: 20px; display: inline-flex; align-items: center; gap: .4rem; padding: .55rem .7rem; border: 1px solid var(--line); border-radius: var(--radius-s); background: oklch(1 0 0 / .92); font-size: .74rem; font-weight: 680; backdrop-filter: blur(12px); }
  .media-dialog { width: min(1100px, calc(100vw - 32px)); max-height: calc(100vh - 32px); padding: 48px 12px 12px; border: 1px solid var(--line); border-radius: var(--radius-l); background: white; box-shadow: var(--shadow); }
  .media-dialog::backdrop { background: oklch(.08 0 0 / .72); backdrop-filter: blur(5px); }
  .media-dialog > button { position: absolute; top: 8px; right: 8px; display: grid; place-items: center; width: 40px; height: 40px; border: 0; border-radius: var(--radius-s); background: var(--surface); cursor: pointer; }
  .media-dialog .product-media { width: 100%; max-height: calc(100vh - 100px); object-fit: contain; border-radius: var(--radius-m); }

  .download-section { padding: clamp(6.5rem, 12vw, 10rem) max(20px, calc((100vw - 1180px) / 2)); background: var(--surface); }
  .download-heading { max-width: 850px; }
  .download-heading h2 { margin-top: 1rem; }
  .download-heading > p:not(.lead) { max-width: 650px; margin-top: 1.4rem; color: var(--ink-2); }
  .platform-message { padding: .8rem 1rem; border: 1px solid color-mix(in oklch, var(--amber) 45%, var(--line)); border-radius: var(--radius-s); background: white; font-size: .86rem; }
  .download-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 1rem; margin-top: 4rem; }
  .download-card { display: flex; flex-direction: column; min-height: 330px; padding: 1.5rem; border: 1px solid var(--line); border-radius: var(--radius-m); background: white; transition: border-color var(--fast) var(--ease), transform var(--fast) var(--ease), box-shadow var(--fast) var(--ease); }
  .download-card.is-recommended { border-color: var(--brand); box-shadow: 0 15px 38px oklch(.4 .1 153 / .13); transform: translateY(-6px); }
  .download-card > div:first-child { display: flex; align-items: center; justify-content: space-between; min-height: 24px; }
  .recommendation, .format { color: var(--brand); font-size: .66rem; font-weight: 760; letter-spacing: .07em; }
  .recommendation { padding: .22rem .5rem; border-radius: 999px; background: var(--brand-soft); }
  .download-card h3 { margin-top: 2.2rem; }
  .download-card > p { color: var(--ink-2); font-size: .88rem; }
  .download-card .requirement { margin-top: .75rem; font-size: .76rem; }
  .button-download { margin-top: auto; color: white; background: var(--ink); }
  .button-download span { opacity: .65; }
  .download-card.is-recommended .button-download { background: var(--brand); }
  .download-meta { display: flex; justify-content: space-between; gap: 1rem; margin-top: 1.5rem; color: var(--ink-3); font-size: .78rem; }
  .download-meta a { display: inline-flex; align-items: center; gap: .4rem; color: var(--ink-2); font-weight: 670; }

  .faq { display: grid; grid-template-columns: minmax(250px, .65fr) minmax(0, 1fr); gap: clamp(3rem, 9vw, 9rem); }
  .faq-heading h2 { margin-top: 1rem; }
  .faq-list { border-top: 1px solid var(--line); }
  .faq details { border-bottom: 1px solid var(--line); }
  .faq summary { display: flex; justify-content: space-between; gap: 1rem; padding: 1.45rem 0; font-weight: 680; cursor: pointer; list-style: none; }
  .faq summary::-webkit-details-marker { display: none; }
  .faq summary span { color: var(--brand); font-size: 1.3rem; transition: transform var(--fast) var(--ease); }
  .faq details[open] summary span { transform: rotate(45deg); }
  .faq details p { max-width: 660px; padding: 0 3rem 1.5rem 0; color: var(--ink-2); }
  .site-footer { display: grid; grid-template-columns: 1fr auto; gap: 3rem; width: var(--container); margin-inline: auto; padding: 3.5rem 0 2rem; border-top: 1px solid var(--line); }
  .footer-brand p { margin-top: .8rem; color: var(--ink-3); font-size: .85rem; }
  .site-footer nav { display: flex; flex-wrap: wrap; justify-content: flex-end; gap: 1rem 1.5rem; color: var(--ink-2); font-size: .82rem; }
  .site-footer nav a:hover { color: var(--brand); }
  .copyright { grid-column: 1 / -1; padding-top: 2rem; color: var(--ink-3); border-top: 1px solid var(--line); font-size: .72rem; }
}

@layer responsive {
  @media (max-width: 900px) {
    :root { --container: min(100% - 32px, 740px); }
    .header-download { margin-left: auto; margin-right: .65rem; }
    .menu-toggle { display: grid; place-items: center; width: 44px; height: 44px; padding: 0; border: 1px solid var(--line); border-radius: var(--radius-s); background: white; cursor: pointer; }
    .menu-toggle .menu-close { display: none; }
    .menu-toggle[aria-expanded="true"] .menu-open { display: none; }
    .menu-toggle[aria-expanded="true"] .menu-close { display: block; }
    .site-nav { position: absolute; inset: 70px 0 auto; display: none; align-items: stretch; margin: 0; padding: 1rem; border: 1px solid var(--line); border-radius: var(--radius-m); background: oklch(1 0 0 / .96); box-shadow: var(--shadow); backdrop-filter: blur(20px); }
    .site-nav.is-open { display: grid; }
    .site-nav > a { display: flex; align-items: center; min-height: 44px; padding-inline: .5rem; }
    .problem-heading { grid-template-columns: 1fr; }
    .problem-heading > * { grid-column: 1 !important; }
    .workflow-story, .local, .faq { grid-template-columns: 1fr; }
    .workflow-visual { position: relative; top: auto; }
    .workflow-media { min-height: 0; }
    .local-points { grid-template-columns: 1fr; }
    .local-points article + article { padding-left: 0; border-left: 0; border-top: 1px solid var(--line); }
    .evidence-item, .evidence-item.reverse { grid-template-columns: 1fr; }
    .evidence-item.reverse .evidence-copy { order: initial; }
    .download-grid { grid-template-columns: 1fr; }
    .download-card { min-height: 270px; }
    .download-card.is-recommended { transform: none; }
  }
  @media (max-width: 620px) {
    :root { --container: calc(100% - 28px); }
    h1 { font-size: clamp(3rem, 14vw, 4.6rem); }
    html[lang="zh-CN"] h1 { font-size: clamp(2.2rem, 9.3vw, 3.6rem); letter-spacing: -.025em; }
    h2 { font-size: clamp(2.25rem, 11vw, 3.35rem); }
    .site-header { min-height: 68px; }
    .header-download { min-height: 38px; padding-inline: .7rem; font-size: .82rem; }
    .hero { padding-top: 3rem; }
    .hero-actions { display: grid; }
    .product-stage { width: calc(100vw - 16px); margin-left: calc((var(--container) - (100vw - 16px)) / 2); }
    .media-placeholder { min-height: 420px; }
    .placeholder-app { inset: 10% 5% 28%; grid-template-columns: 12% 34% 54%; }
    .placeholder-assistant { display: none; }
    .demo-controls { justify-content: flex-start; overflow-x: auto; padding-bottom: .3rem; }
    .demo-step { flex: 0 0 auto; }
    .proof-strip { justify-content: flex-start; gap: .75rem; }
    .proof-strip span { width: calc(50% - .5rem); }
    .problem-list { grid-template-columns: 1fr; }
    .problem-list li { min-height: 0; padding: 1.5rem 0 2rem !important; }
    .problem-list li + li { border-left: 0; border-top: 1px solid var(--line); }
    .problem-list h3 { margin-top: 1.4rem; }
    .workflow-story { width: 100%; }
    .workflow-media { min-height: 0; }
    .workflow-steps button { min-height: 170px; }
    .why { min-height: auto; padding-inline: 14px; }
    .why-body { margin-left: 0; }
    .why-orbit { width: 100vw; height: 100vw; }
    .local-system { width: calc(100vw - 28px); }
    .local-points article { padding-right: 0; }
    .evidence-list { margin-top: 3rem; }
    .evidence-media .product-media { min-height: 330px; }
    .download-section { padding-inline: 14px; }
    .download-meta { flex-direction: column; }
    .faq details p { padding-right: 0; }
    .site-footer { grid-template-columns: 1fr; }
    .site-footer nav { justify-content: flex-start; }
  }
  @media (scripting: none) and (max-width: 900px) {
    .menu-toggle { display: none; }
    .site-header { flex-wrap: wrap; padding-block: 12px; }
    .site-nav { position: static; display: flex; flex-wrap: wrap; width: 100%; margin-top: 12px; padding-top: 12px; border-top: 1px solid var(--line); }
  }
}

@layer motion {
  .has-motion [data-reveal] { opacity: 0; transform: translateY(24px); transition: opacity 720ms var(--ease), transform 720ms var(--ease); }
  .has-motion [data-reveal].is-visible { opacity: 1; transform: translateY(0); }
  @media (prefers-reduced-motion: no-preference) {
    .product-stage.is-visible .product-window { animation: stage-in 900ms var(--ease) both; }
    .why-orbit { animation: orbit 18s linear infinite; }
    .local-system.is-active .map-line { animation: path 2.3s var(--ease) forwards; }
    @keyframes stage-in { from { opacity: 0; transform: translateY(28px) scale(.985); } }
    @keyframes orbit { to { transform: rotate(360deg); } }
    @keyframes path { to { stroke-dashoffset: 0; } }
  }
  @media (prefers-reduced-motion: reduce) {
    html { scroll-behavior: auto; }
    *, *::before, *::after { animation-duration: .01ms !important; animation-iteration-count: 1 !important; transition-duration: .01ms !important; }
  }
}