:root {
  color-scheme: light;
  --page: #faf9f6;
  --surface: #ffffff;
  --ink: #252b32;
  --muted: #59636d;
  --subtle: #626c75;
  --line: #dce1e3;
  --accent: #a64e12;
  --accent-hover: #edaa4e;
  --green: #23734f;
  --blue: #2b679a;
  --stroke: 0.0625rem;
  --radius: 0.75rem;
  --radius-small: 0.375rem;
  --gutter: 1.125rem;
  --section-space: 2.75rem;
  --space-1: 0.5rem;
  --space-2: 0.75rem;
  --space-3: 1rem;
  --space-4: 1.5rem;
  --space-5: 2rem;
  --body-size: 0.875rem;
  --small-size: 0.8125rem;
  --tiny-size: 0.75rem;
  --title-size: 1.375rem;
  --feature-size: 1.0625rem;
  --button-size: 0.8125rem;
  --font: "MiSans", "Microsoft YaHei UI", "PingFang SC", system-ui, sans-serif;
  --mono: "Cascadia Code", "SFMono-Regular", Consolas, monospace;
  --action: #f2b461;
  --on-action: #33220c;
  --surface-soft: #f1f3f3;
  --chart-surface: #f7f9f8;
  --line-strong: #c9d1d5;
  --chart-grid: #dfe5e3;
  --green-soft: #e9f3ed;
  --green-line: #aacbb9;
  --green-mark: #428565;
  --blue-soft: #eaf1f8;
  --blue-line: #b4cadd;
  --blue-mark: #457fad;
  --callout: #fbf0df;
  --callout-line: #e9d5b7;
  --media-outline: #0000001a;
  --shadow-soft: #00000008;
  --shadow-raised: #00000012;
}
*, *::before, *::after { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 6rem; -webkit-font-smoothing: antialiased; -moz-osx-font-smoothing: grayscale; }
body { margin: 0; background: var(--page); color: var(--ink); font-family: var(--font); font-size: var(--body-size); line-height: 1.65; }
::selection { background: var(--action); color: var(--on-action); }
a { color: inherit; text-decoration: none; -webkit-tap-highlight-color: transparent; }
button { font: inherit; color: inherit; cursor: pointer; -webkit-tap-highlight-color: transparent; }
button, a, summary { touch-action: manipulation; }
button:disabled { cursor: wait; }
button, iframe, img, svg { max-width: 100%; }
img, iframe, svg { display: block; }
img { height: auto; }
h1, h2, h3, h4, p, figure, ol { margin: 0; }
h1, h2, h3, h4 { text-wrap: balance; }
p, li, figcaption { text-wrap: pretty; }
h2 { font-size: var(--title-size); line-height: 1.4; font-weight: 650; letter-spacing: -0.03125rem; }
h3 { font-size: var(--feature-size); font-weight: 650; line-height: 1.5; }
p { color: var(--muted); }
[hidden] { display: none !important; }
:focus-visible { outline: 0.125rem solid var(--accent); outline-offset: 0.25rem; }
.icon-sprite { position: absolute; width: 0; height: 0; overflow: hidden; }
.icon { width: 1.125rem; height: 1.125rem; flex: none; fill: none; stroke: currentColor; stroke-width: 1.6; stroke-linecap: round; stroke-linejoin: round; }
.container { width: min(75rem, calc(100% - var(--gutter) * 2)); margin-inline: auto; }
.section { padding-block: var(--section-space); }
.muted { color: var(--muted); }
.eyebrow, .technical-label, .feature-number, .mode-kicker { font-family: var(--mono); font-size: var(--tiny-size); font-weight: 400; letter-spacing: 0.0625rem; line-height: 1.6; }
.eyebrow { color: var(--accent); margin-bottom: var(--space-3); }
.technical-label, .fine-print { color: var(--subtle); }
.fine-print { font-size: var(--tiny-size); }
.skip-link { position: absolute; left: var(--gutter); top: -5rem; z-index: 100; padding: 0.75rem 1rem; border-radius: var(--radius-small); background: var(--action); color: var(--on-action); }
.skip-link:focus { top: var(--space-3); }
.status-dot { display: inline-block; width: 0.375rem; height: 0.375rem; border-radius: 50%; background: var(--accent); flex: none; }
.button { display: inline-flex; align-items: center; justify-content: center; gap: var(--space-1); min-height: 2.875rem; padding: 0.75rem 1rem; border: var(--stroke) solid transparent; border-radius: var(--radius-small); background: var(--action); color: var(--on-action); font-size: var(--button-size); font-weight: 650; line-height: 1.45; transition: background-color 180ms ease, box-shadow 180ms ease, translate 180ms ease; }
.button:hover { background: var(--accent-hover); box-shadow: 0 0.25rem 1rem #a64e1214; }
.button:active { translate: 0 0.0625rem; }
.button { overflow-wrap: anywhere; }
.button > span { min-width: 0; }
.button > .icon:last-child { margin-left: 0.5rem; }
.button-small { min-height: 2.75rem; padding: 0.5rem 0.75rem; }
.text-link { display: inline-flex; align-items: center; gap: var(--space-1); min-height: 2.75rem; color: var(--ink); border: 0; background: none; padding: 0.5rem 0; font-size: var(--button-size); line-height: 1.5; transition: color 180ms ease; }
.text-link:hover { color: var(--accent); }
.text-link .icon:last-child, .hero-index .icon, .footer-links .icon { transition: translate 180ms ease; }
.text-link:hover .icon:last-child, .hero-index a:hover .icon, .footer-links a:hover .icon { translate: 0.125rem 0; }

/* Navigation retains normal flow when text or the mobile menu expands. */
.site-header { position: sticky; top: 0; z-index: 20; background: var(--page); border-bottom: var(--stroke) solid transparent; transition: border-color 180ms ease, box-shadow 180ms ease; }
.site-header.is-scrolled { border-bottom-color: var(--line); box-shadow: 0 0.25rem 1.5rem var(--shadow-soft); }
.nav { position: relative; display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 0.5rem 0.75rem; min-height: 4.25rem; padding-block: 0.625rem; }
.brand { display: inline-flex; align-items: center; gap: 0.5rem; min-height: 2.75rem; font-size: 0.875rem; font-weight: 600; line-height: 1.5; }
.brand img { width: 1.75rem; height: 1.75rem; flex: none; }
.brand strong { font-family: var(--mono); font-weight: 600; }
.nav-links { display: flex; justify-content: center; flex-wrap: wrap; gap: 0.5rem 1.25rem; order: 3; flex-basis: 100%; }
.nav-links a, .nav-source { display: inline-flex; align-items: center; justify-content: center; gap: 0.375rem; min-height: 2.75rem; color: var(--muted); font-size: var(--small-size); transition: color 180ms ease; }
.nav-links a:hover, .nav-source:hover { color: var(--ink); }
.nav-actions { display: flex; align-items: center; gap: 0.375rem; }
.nav-source { display: none; }
.js-ready .nav-links { display: none; }
.menu-toggle { display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 0.375rem; padding: 0; width: 2.75rem; min-height: 2.75rem; background: transparent; border: var(--stroke) solid var(--line); border-radius: var(--radius-small); }
.menu-toggle span { display: block; width: 1rem; height: var(--stroke); background: var(--ink); transition: rotate 180ms ease, translate 180ms ease; }
.menu-toggle[aria-expanded="true"] span:first-child { rotate: 45deg; translate: 0 0.21875rem; }
.menu-toggle[aria-expanded="true"] span:last-child { rotate: -45deg; translate: 0 -0.21875rem; }
.mobile-menu { flex-basis: 100%; padding: 0.5rem 0 0.25rem; border-top: var(--stroke) solid var(--line); }
.mobile-menu a { display: flex; justify-content: space-between; align-items: center; min-height: 2.75rem; padding: 0.5rem 0.25rem; color: var(--muted); }
.mobile-menu a:hover { color: var(--accent); }

/* Real footage and a separately labelled, accessible HUD illustration. */
.hero { display: grid; gap: 2rem; padding-top: 2.25rem; }
.hero-copy .eyebrow { display: flex; align-items: center; flex-wrap: wrap; gap: 0.5rem; font-size: 0.75rem; letter-spacing: 0.03125rem; }
.eyebrow-divider { color: var(--subtle); }
h1 { font-size: 2rem; line-height: 1.2; font-weight: 700; letter-spacing: -0.0625rem; }
h1 > span { display: block; }
h1 > span + span { margin-top: 0.375rem; }
.accent-word { color: var(--accent); }
.hero-lead { margin-top: 1.25rem; font-size: 0.9375rem; line-height: 1.8; }
.hero-actions { display: flex; align-items: center; flex-wrap: wrap; gap: 0.5rem 1.25rem; margin-top: 1.5rem; }
.hero-demo { margin-top: 0.5rem; }
.hero-visual { position: relative; min-width: 0; }
.game-window { overflow: hidden; border: var(--stroke) solid var(--media-outline); border-radius: var(--radius); background: var(--surface); box-shadow: 0 1.5rem 4rem var(--shadow-raised); }
.window-bar { display: flex; align-items: center; justify-content: space-between; gap: 0.5rem; min-height: 2.25rem; padding: 0.625rem 0.875rem; font-family: var(--mono); font-size: 0.75rem; color: var(--muted); }
.window-bar > span:first-child { display: flex; align-items: center; flex-wrap: wrap; gap: 0.5rem; }
.window-bar .status-dot { width: 0.25rem; height: 0.25rem; background: var(--green); }
.window-dots { display: flex; gap: 0.25rem; }
.window-dots i { width: 0.25rem; height: 0.25rem; border-radius: 50%; background: var(--line-strong); }
.hero-game { width: 100%; aspect-ratio: 16 / 11; object-fit: cover; object-position: 73% center; }
.game-label { display: flex; align-items: center; flex-wrap: wrap; gap: 0.375rem; padding: 0.625rem 0.875rem; font-size: 0.75rem; color: var(--muted); }
.game-label > span:last-child { margin-left: auto; font-family: var(--mono); font-size: 0.625rem; letter-spacing: 0.03125rem; }
.record-mark { display: inline-block; width: 0.375rem; height: 0.375rem; border: var(--stroke) solid var(--accent); border-radius: 50%; flex: none; }
.hero-readout { position: relative; margin: -0.125rem 0.75rem 0; padding: 0.875rem; background: var(--surface); border: var(--stroke) solid var(--line-strong); border-top: 0.125rem solid var(--accent); border-radius: 0 0 0.5rem 0.5rem; box-shadow: 0 0.75rem 2rem var(--shadow-soft); }
.readout-heading, .chart-heading { display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 0.5rem; font-size: var(--tiny-size); }
.readout-heading > span:first-child { display: flex; align-items: center; gap: 0.375rem; }
.readout-heading .icon { width: 0.875rem; height: 0.875rem; color: var(--accent); }
.demo-label { color: var(--subtle); font-size: 0.75rem; font-weight: 400; }
.readout-content { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); align-items: center; gap: 0.5rem; margin-top: 0.625rem; }
.readout-result strong { display: flex; align-items: baseline; flex-wrap: wrap; gap: 0.75rem; color: var(--green); font-size: 1.125rem; font-weight: 500; }
.readout-result strong > span { font: 0.8125rem var(--mono); color: var(--ink); font-variant-numeric: tabular-nums; }
.readout-result small { font-size: 0.75rem; color: var(--muted); }
.readout-result > span { font-size: 0.75rem; color: var(--subtle); }
.mini-chart { width: 100%; height: auto; }
.chart-grid { fill: none; stroke: var(--chart-grid); stroke-width: 1; }
.chart-guide { fill: none; stroke: var(--green-line); stroke-width: 1; stroke-dasharray: 4 5; }
.chart-line { fill: none; stroke: var(--green); stroke-width: 2; stroke-linejoin: round; stroke-linecap: round; }
.chart-dot { fill: var(--green); }
.hero-visual figcaption { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 0.5rem; margin-top: 0.875rem; font-size: 0.75rem; color: var(--subtle); }
.hero-visual figcaption .technical-label { font-size: 0.625rem; letter-spacing: 0.03125rem; }
.hero-visual figcaption > span:last-child { display: flex; align-items: center; gap: 0.5rem; }
.hero-visual figcaption .icon { width: 0.75rem; height: 0.75rem; }
.hero-index { display: grid; border-block: var(--stroke) solid var(--line); }
.hero-index a { display: flex; align-items: center; gap: 0.875rem; padding: 0.875rem 0; min-width: 0; min-height: 2.75rem; transition: color 180ms ease; }
.hero-index a + a { border-top: var(--stroke) solid var(--line); }
.index-number { color: var(--accent); font: 0.75rem var(--mono); }
.hero-index a > span:nth-child(2) { display: flex; align-items: baseline; flex-wrap: wrap; gap: 0.5rem; font-size: var(--small-size); }
.index-detail { color: var(--subtle); font-size: 0.75rem; }
.hero-index a > .icon { margin-left: auto; width: 1rem; height: 1rem; color: var(--muted); }
.hero-index a:hover { color: var(--accent); }

/* Product story: a wide primary module and two supporting modules. */
.demo-section { display: grid; gap: 1.5rem; }
.demo-copy { grid-row: 1; }
.demo-copy h2 br { display: none; }
.demo-copy > p:not(.eyebrow) { margin-top: 0.875rem; }
.demo-copy .bilibili-link { margin-top: 0.875rem; }
.demo-copy > .fine-print { font-size: var(--tiny-size); }
.video-frame { overflow: hidden; border-radius: var(--radius); border: var(--stroke) solid var(--media-outline); background: var(--surface); align-self: center; }
.video-frame iframe { width: 100%; aspect-ratio: 16 / 9; border: 0; background: var(--surface-soft); }
.video-caption { display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 0.5rem; padding: 0.625rem 0.875rem; color: var(--muted); font-size: var(--tiny-size); font-variant-numeric: tabular-nums; }
.video-caption > span:first-child { display: inline-flex; align-items: center; gap: 0.5rem; }
.section-heading { display: flex; flex-direction: column; gap: 0.875rem; margin-bottom: 1.5rem; }
.section-heading > p { font-size: var(--small-size); }
.feature-panel { border: var(--stroke) solid var(--line); border-radius: var(--radius); background: var(--surface); overflow: hidden; scroll-margin-top: 1rem; }
.feature-wide { display: grid; gap: 1.5rem; padding: 1rem; }
.feature-number { color: var(--subtle); font-size: 0.75rem; }
.feature-title { display: flex; align-items: center; gap: 0.625rem; margin-top: 0.875rem; }
.feature-title .icon { color: var(--accent); }
.feature-copy h4 { margin-top: 1.25rem; font-size: 1.25rem; font-weight: 500; line-height: 1.55; }
.feature-copy h4 br { display: none; }
.feature-copy > p { margin-top: 0.75rem; font-size: var(--small-size); }
.feature-tags { display: flex; flex-wrap: wrap; gap: 0.5rem; margin-top: 1.25rem; }
.feature-tags span, .mode-tag { display: inline-flex; padding: 0.25rem 0.5rem; border: var(--stroke) solid var(--line); border-radius: 0.25rem; color: var(--muted); font-size: 0.75rem; }
.assessment-demo { min-width: 0; padding: 1rem; border: var(--stroke) solid var(--line); background: var(--chart-surface); border-radius: 0.5rem; }
.chart-subtitle { font-size: 0.75rem; color: var(--subtle); }
.assessment-values { display: flex; justify-content: space-between; align-items: center; flex-wrap: wrap; gap: 0.75rem; margin-top: 1rem; }
.assessment-values > span { display: flex; align-items: baseline; flex-wrap: wrap; gap: 0.625rem; }
.assessment-values strong { font: 2rem var(--mono); font-variant-numeric: tabular-nums; }
.assessment-values small, .sync-score-value small { font-size: 0.875rem; color: var(--subtle); margin-left: 0.125rem; }
.assessment-values > span > span { color: var(--muted); font-size: 0.75rem; }
.chart-legend { display: flex; align-items: center; flex-wrap: wrap; gap: 0.5rem 0.875rem; }
.chart-legend > span { display: inline-flex; align-items: center; gap: 0.375rem; font-size: 0.75rem; color: var(--muted); }
.legend-dot { display: inline-block; width: 0.3125rem; height: 0.3125rem; border-radius: 50%; flex: none; }
.good { background: var(--green); }
.amber { background: var(--accent); }
.blue { background: var(--blue); }
.assessment-chart { width: 100%; margin-block: 0.75rem 1rem; }
.chart-band { fill: var(--green-soft); }
.shooting-heading { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 0.5rem; border-top: var(--stroke) solid var(--line); padding-top: 0.75rem; font-size: 0.75rem; }
.shooting-heading strong { color: var(--green); font: 0.875rem var(--mono); }
.shot-bars { display: flex; align-items: end; gap: 0.25rem; height: 3.25rem; margin-top: 0.5rem; border-bottom: var(--stroke) solid var(--green-line); }
.shot-bars i { flex: 1; height: var(--bar); background: var(--green-mark); border-radius: 0.0625rem 0.0625rem 0 0; }
.shot-bars .off { background: var(--accent); }
.chart-axis { display: flex; justify-content: space-between; flex-wrap: wrap; gap: 0.5rem; margin-top: 0.5rem; color: var(--subtle); font-size: 0.75rem; }
.feature-pair { display: grid; gap: 1rem; margin-top: 1rem; }
.secondary-feature { display: flex; flex-direction: column; padding: 1rem; }
.recoil-demo, .sync-demo { min-width: 0; margin-top: 1.25rem; padding: 0.875rem; border: var(--stroke) solid var(--line); border-radius: 0.5rem; background: var(--chart-surface); }
.recoil-chart { width: 100%; height: 10rem; margin-top: 0.75rem; }
.input-path { fill: none; stroke: var(--blue); stroke-width: 2; stroke-linejoin: round; stroke-linecap: round; }
.input-dot { fill: var(--blue); }
.feature-note { margin-top: 0.875rem; font-size: var(--tiny-size); color: var(--subtle); }
.sync-score { display: flex; align-items: center; justify-content: center; flex-wrap: wrap; gap: 1.75rem; padding: 1.375rem 0 1.125rem; }
.keycap { display: inline-flex; align-items: center; justify-content: center; width: 2.375rem; height: 2.375rem; flex: none; border: var(--stroke) solid var(--green-line); border-bottom-width: 0.1875rem; border-radius: var(--radius-small); background: var(--green-soft); color: var(--green); font: 1rem var(--mono); }
.keycap:last-child { background: var(--blue-soft); border-color: var(--blue-line); color: var(--blue); }
.sync-score-value { display: flex; flex-direction: column; align-items: center; }
.sync-score-value strong { color: var(--green); font: 2.5rem var(--mono); font-variant-numeric: tabular-nums; line-height: 1.3; }
.sync-score-value > span { font-size: 0.75rem; color: var(--muted); text-align: center; }
.sync-timeline { display: grid; grid-template-columns: auto minmax(0, 1fr); align-items: center; gap: 0.375rem 0.625rem; }
.timeline-label { font-size: 0.75rem; color: var(--muted); }
.timeline-track { display: flex; gap: 0.1875rem; }
.timeline-track i { flex: 1; height: 0.5rem; border-radius: 0.0625rem; }
.sync-left { background: var(--green-mark); }
.sync-right { background: var(--blue-mark); }
.timeline-track .sync-miss { border-right: 0.5rem solid var(--accent); }
.workbench-note { display: flex; align-items: flex-start; gap: 0.75rem; padding-top: 1.5rem; }
.workbench-note > .icon { color: var(--subtle); margin-top: 0.125rem; }
.workbench-note p { font-size: var(--tiny-size); }
.workbench-note strong { color: var(--ink); font-weight: 500; display: block; margin-bottom: 0.25rem; }
.workbench-note .technical-label { display: none; }

/* Display modes and progressive disclosure. */
.setup-section { margin-top: 1rem; background: var(--surface-soft); border-block: var(--stroke) solid var(--line); }
.display-modes { display: grid; gap: 1.5rem; }
.display-mode { display: grid; grid-template-columns: 5.5rem minmax(0, 1fr); align-items: center; gap: 1rem; }
.display-mode h3 { margin-top: 0.5rem; }
.display-mode p:not(.mode-kicker) { margin-top: 0.5rem; font-size: var(--small-size); }
.mode-kicker { display: flex; align-items: center; flex-wrap: wrap; gap: 0.375rem; color: var(--subtle); font-size: 0.6875rem; letter-spacing: 0.03125rem; }
.mode-kicker .icon { width: 0.875rem; height: 0.875rem; }
.mode-tag { margin-top: 0.75rem; }
.monitor-screen { position: relative; width: 100%; aspect-ratio: 16 / 11; border: 0.125rem solid var(--line-strong); border-radius: 0.375rem; background: var(--surface); box-shadow: inset 0 0 0 0.25rem var(--surface-soft); }
.monitor-crosshair { position: absolute; inset: 0; display: grid; place-items: center; font: 1rem var(--mono); color: var(--subtle); }
.monitor-stand { position: relative; width: 35%; height: 0.5rem; margin: 0 auto; border-bottom: 0.125rem solid var(--line-strong); }
.monitor-stand::before { content: ""; position: absolute; left: 40%; width: 20%; height: 100%; background: var(--line-strong); }
.mini-overlay { display: flex; align-items: end; gap: 0.125rem; position: absolute; top: 30%; right: 8%; width: 42%; height: 35%; padding: 0.25rem; border: var(--stroke) solid var(--green-line); background: var(--green-soft); border-radius: 0.1875rem; }
.mini-overlay i { flex: 1; height: 55%; background: var(--green); }
.mini-overlay i:nth-child(2n) { height: 90%; }
.mini-overlay i:nth-child(3n) { height: 35%; }
.gamebar-monitor .mini-overlay { top: 47%; right: 8%; border-color: var(--blue-line); background: var(--blue-soft); }
.gamebar-monitor .mini-overlay i { background: var(--blue); }
.gamebar-toolbar { display: flex; gap: 0.25rem; position: absolute; top: 15%; left: 25%; width: 50%; height: 15%; padding: 0.125rem 0.25rem; border: var(--stroke) solid var(--subtle); border-radius: 0.1875rem; }
.gamebar-toolbar i { flex: 1; background: var(--subtle); border-radius: 0.0625rem; }
.steps-heading { display: flex; align-items: center; justify-content: space-between; flex-wrap: wrap; gap: 0.75rem; margin-top: 2rem; padding-top: 1.5rem; border-top: var(--stroke) solid var(--line); }
.steps-heading h3 { font-size: var(--body-size); }
.steps-heading .technical-label { display: none; }
.steps { list-style: none; display: grid; gap: 1.25rem; margin-top: 1.25rem; padding: 0; }
.steps li { display: flex; align-items: baseline; gap: 0.875rem; }
.step-number { font: 0.8125rem var(--mono); color: var(--accent); }
.steps h4 { font-size: var(--small-size); font-weight: 550; }
.steps p { margin-top: 0.375rem; font-size: var(--tiny-size); }
.faq-section { display: grid; gap: 1.5rem; }
.faq-intro > p:not(.eyebrow) { margin-top: 0.875rem; font-size: var(--small-size); }
.faq-intro > .text-link { margin-top: 0.875rem; color: var(--muted); }
.faq-list details { border-bottom: var(--stroke) solid var(--line); }
.faq-list details:first-child { border-top: var(--stroke) solid var(--line); }
.faq-list summary { display: flex; align-items: center; justify-content: space-between; gap: 1rem; min-height: 3.5rem; padding: 1rem 0; font-size: var(--small-size); font-weight: 500; list-style: none; cursor: pointer; transition: color 180ms ease; }
.faq-list summary::-webkit-details-marker { display: none; }
.faq-list summary:hover, .faq-list details[open] summary { color: var(--accent); }
.faq-plus { position: relative; display: inline-block; width: 0.75rem; height: 0.75rem; flex: none; }
.faq-plus::before, .faq-plus::after { content: ""; position: absolute; width: 0.75rem; height: var(--stroke); top: 50%; left: 0; background: currentColor; }
.faq-plus::after { rotate: 90deg; transition: rotate 180ms ease; }
details[open] .faq-plus::after { rotate: 0deg; }
.faq-answer { padding: 0 1.75rem 1.125rem 0; font-size: var(--small-size); line-height: 1.9; }
.download-section { padding-block: 0.5rem var(--section-space); }
.download-panel { display: grid; gap: 1.75rem; padding: 1.5rem 1rem; background: var(--callout); border: var(--stroke) solid var(--callout-line); border-radius: var(--radius); position: relative; overflow: hidden; }
.download-panel::before { content: ""; width: 2.5rem; height: 0.125rem; position: absolute; top: 0; left: 1rem; background: var(--accent); }
.download-panel .eyebrow { font-size: 0.75rem; letter-spacing: 0.03125rem; }
.download-panel h2 { line-height: 1.5; }
.download-panel p:not(.eyebrow) { margin-top: 0.75rem; font-size: var(--small-size); }
.download-actions { display: flex; flex-direction: column; align-items: flex-start; gap: 0.375rem; }
.download-panel > * { min-width: 0; }
.download-actions > * { max-width: 100%; }
.download-actions > .text-link { color: var(--muted); }
.download-actions > .text-link:hover { color: var(--accent); }
.download-actions > .fine-print { margin-top: 0.25rem; font-size: 0.75rem; }
.site-footer { padding-bottom: 1.25rem; }
.footer-top { display: flex; align-items: center; flex-wrap: wrap; gap: 0.5rem 1.25rem; padding-block: 1.125rem; border-top: var(--stroke) solid var(--line); }
.footer-top > p { font-size: var(--tiny-size); }
.footer-links { display: flex; gap: 1rem; flex-basis: 100%; }
.footer-links a, .footer-bottom a { display: inline-flex; align-items: center; gap: 0.25rem; min-height: 2.75rem; color: var(--muted); font-size: var(--tiny-size); }
.footer-links a:hover, .footer-bottom a:hover { color: var(--ink); }
.footer-links .icon, .footer-bottom .icon { width: 0.875rem; height: 0.875rem; }
.footer-bottom { display: flex; flex-wrap: wrap; align-items: center; gap: 0.375rem 1rem; color: var(--subtle); font-size: 0.75rem; }

@media (min-width: 48rem) {
  :root { --gutter: 2rem; --section-space: 4rem; --body-size: 0.9375rem; --title-size: 2rem; --feature-size: 1.25rem; --button-size: 0.875rem; }
  .nav { min-height: 5rem; flex-wrap: nowrap; }
  .brand { font-size: 1rem; gap: 0.625rem; }
  .brand img { width: 2rem; height: 2rem; }
  .nav-links, .js-ready .nav-links { display: flex; order: initial; flex-basis: auto; gap: 1.25rem; }
  .nav-actions { gap: 1rem; }
  .menu-toggle, .mobile-menu { display: none; }
  .hero { padding-top: 3.5rem; gap: 2.5rem; }
  h1 { font-size: 3.25rem; letter-spacing: -0.125rem; }
  .hero-lead { font-size: 1.0625rem; }
  .hero-actions { margin-top: 2rem; }
  .button { min-height: 3.125rem; padding: 0.875rem 1.25rem; }
  .button-small { min-height: 2.75rem; padding: 0.5rem 1rem; }
  .hero-visual { max-width: 42rem; width: 100%; justify-self: center; }
  .hero-game { aspect-ratio: 16 / 10; }
  .window-bar { min-height: 2.5rem; padding-inline: 1rem; }
  .hero-readout { margin: -2.5rem 1.5rem 0; padding: 1.125rem; border-radius: 0.625rem; }
  .readout-result strong { font-size: 1.5rem; }
  .readout-result strong > span { font-size: 0.9375rem; }
  .hero-visual figcaption { margin-top: 1.125rem; }
  .hero-index { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .hero-index a { margin-block: 1.25rem; padding: 0 1.25rem; }
  .hero-index a:first-child { padding-left: 0; }
  .hero-index a:last-child { padding-right: 0; }
  .hero-index a + a { border-top: 0; border-left: var(--stroke) solid var(--line); }
  .hero-index a > span:nth-child(2) { flex-direction: column; gap: 0.125rem; }
  .demo-section { grid-template-columns: minmax(0, 1.6fr) minmax(0, 1fr); align-items: center; gap: 2rem; }
  .demo-copy { grid-row: auto; }
  .demo-copy h2 br { display: initial; }
  .demo-copy > p:not(.eyebrow) { font-size: 0.8125rem; }
  .demo-copy > .fine-print { font-size: 0.75rem; }
  .section-heading { flex-direction: row; align-items: flex-end; justify-content: space-between; gap: 2rem; margin-bottom: 2rem; }
  .section-heading > p { flex-shrink: 0; }
  .feature-wide { grid-template-columns: minmax(0, 1fr) minmax(0, 1.5fr); align-items: center; padding: 1.75rem; gap: 2rem; }
  .feature-copy h4 { font-size: 1.25rem; }
  .feature-copy h4 br { display: initial; }
  .feature-copy > p { font-size: 0.875rem; }
  .feature-pair { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .secondary-feature { padding: 1.5rem; }
  .secondary-feature .feature-copy { flex: 1; }
  .feature-note { min-height: 2.75rem; }
  .assessment-values .chart-legend { flex-direction: column; align-items: flex-start; gap: 0.25rem; }
  .workbench-note p { display: flex; flex-wrap: wrap; gap: 0.25rem 0.5rem; }
  .workbench-note strong { margin: 0; }
  .display-modes { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 2rem; }
  .display-mode { grid-template-columns: 1fr; gap: 1.5rem; }
  .monitor-illustration { width: 10rem; }
  .mode-kicker { font-size: 0.75rem; }
  .steps-heading { margin-top: 2.5rem; padding-top: 2rem; }
  .steps-heading .technical-label { display: inline; font-size: 0.75rem; }
  .steps { grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 2rem; margin-top: 1.5rem; }
  .faq-section { grid-template-columns: minmax(0, 1fr) minmax(0, 1.6fr); gap: 3rem; }
  .faq-list summary { font-size: 0.875rem; }
  .download-panel { grid-template-columns: minmax(0, 1fr) auto; align-items: center; gap: 2rem; padding: 2.5rem; }
  .download-panel::before { left: 2.5rem; }
  .download-actions { align-items: center; }
  .footer-links { flex-basis: auto; margin-left: auto; }
  .footer-bottom > span:nth-child(2) { margin-left: auto; }
}
@media (min-width: 64rem) {
  :root { --section-space: 5rem; --title-size: 2.25rem; }
  .nav-source { display: inline-flex; }
  .nav-links, .js-ready .nav-links { gap: 2rem; }
  .hero { grid-template-columns: minmax(0, 1fr) minmax(0, 1.06fr); align-items: center; column-gap: 2.25rem; row-gap: 3.5rem; padding-top: 4.5rem; }
  h1 { font-size: 3.625rem; line-height: 1.25; }
  .hero-copy .eyebrow { margin-bottom: 1.5rem; }
  .hero-lead { margin-top: 1.5rem; }
  .hero-actions { gap: 1.25rem; }
  .hero-visual { max-width: none; padding-top: 0.5rem; }
  .hero-game { aspect-ratio: 16 / 11; }
  .hero-readout { margin: -3rem 1.5rem 0 -1.25rem; width: calc(100% - 2rem); padding: 1rem 1.25rem; }
  .hero-index { grid-column: 1 / -1; }
  .hero-index a { margin-block: 1.5rem; padding-inline: 2rem; gap: 1.25rem; }
  .hero-index a > span:nth-child(2) { flex-direction: row; gap: 0.875rem; }
  .index-number { font-size: 0.8125rem; }
  .demo-section { grid-template-columns: minmax(0, 1.65fr) minmax(0, 1fr); gap: 4rem; }
  .demo-copy > p:not(.eyebrow) { font-size: 0.9375rem; line-height: 1.9; }
  .demo-copy > .fine-print { font-size: 0.75rem; }
  .demo-copy .bilibili-link { margin-top: 1.25rem; }
  .feature-wide { padding: 2.5rem; gap: 4rem; grid-template-columns: minmax(0, 1fr) minmax(0, 1.6fr); }
  .feature-copy h4 { font-size: 1.75rem; margin-top: 1.5rem; }
  .feature-copy > p { margin-top: 1rem; }
  .feature-tags { margin-top: 1.75rem; }
  .assessment-demo { padding: 1.5rem; }
  .assessment-values .chart-legend { flex-direction: row; gap: 0.75rem; }
  .assessment-values strong { font-size: 2.5rem; }
  .feature-pair { gap: 1.5rem; margin-top: 1.5rem; }
  .secondary-feature { padding: 2rem; }
  .recoil-demo, .sync-demo { padding: 1.25rem; margin-top: 1.5rem; }
  .recoil-chart { height: 11rem; }
  .sync-score { padding-block: 1.375rem; gap: 3rem; }
  .sync-score-value strong { font-size: 3rem; }
  .sync-timeline { margin-top: 0.25rem; }
  .feature-note { min-height: auto; }
  .workbench-note { align-items: center; padding-top: 1.75rem; }
  .workbench-note .technical-label { display: inline; margin-left: auto; font-size: 0.625rem; }
  .display-modes { gap: 4rem; margin-top: 2.5rem; }
  .display-mode { grid-template-columns: 9rem minmax(0, 1fr); gap: 1.75rem; }
  .monitor-illustration { width: 100%; }
  .steps-heading { margin-top: 3rem; }
  .faq-section { gap: 5rem; }
  .faq-list summary { min-height: 4rem; font-size: 0.9375rem; }
  .faq-answer { font-size: 0.875rem; }
  .download-panel { padding: 3.5rem 4rem; }
  .download-panel::before { left: 4rem; }
  .download-panel h2 { font-size: 2.5rem; }
  .footer-top { padding-block: 1.5rem; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { transition: none !important; animation: none !important; }
}