:root {
  --c-bg: #FFFFFF;
  --c-panel: #F7F7F7;
  --c-panel-2: #EFEFEF;
  --c-line: #E6E6E6;
  --c-line-strong: #D2D3D6;
  --c-brick: #A8331F;
  --c-brick-deep: #842615;
  --c-ink: #1E2026;
  --c-ink-soft: #5F636B;
  --c-link: #2B5FB8;
  --c-success: #2E8B57;
  --c-warn: #C98A12;
  --c-error: #D92D20;
  --c-success-ink: #226840;
  --c-warn-ink: #805608;
  --c-error-ink: #B42318;
  --c-clear: transparent;
  --on-brick: #FFFFFF;
  --on-brick-muted: rgba(255, 255, 255, 0.74);
  --on-brick-faint: rgba(255, 255, 255, 0.52);
  --on-brick-punct: rgba(255, 255, 255, 0.56);
  --glass-back: rgba(255, 255, 255, 0.14);
  --glass-mid: rgba(255, 255, 255, 0.18);
  --glass-front: rgba(255, 255, 255, 0.22);
  --glass-chip: rgba(255, 255, 255, 0.16);
  --glass-field: rgba(255, 255, 255, 0.08);
  --glass-edge: rgba(255, 255, 255, 0.35);
  --glass-field-edge: rgba(255, 255, 255, 0.28);
  --glass-rule: rgba(255, 255, 255, 0.16);
  --glass-dot-1: rgba(255, 255, 255, 0.55);
  --glass-dot-2: rgba(255, 255, 255, 0.38);
  --glass-dot-3: rgba(255, 255, 255, 0.24);
  --glass-toggle-edge: rgba(255, 255, 255, 0.55);
  --glass-toggle-knob: rgba(255, 255, 255, 0.62);
  --stage-highlight: rgba(255, 255, 255, 0.10);
  --veil: rgba(30, 32, 38, 0.24);

  --font-display: "Inter", "Noto Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, sans-serif;
  --font-body: "Inter", "Noto Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, sans-serif;
  --font-mono: "JetBrains Mono", ui-monospace, "SFMono-Regular", Menlo, Consolas, monospace;
  --weight-normal: 400;
  --weight-medium: 500;
  --size-body: 16px;
  --size-h1: clamp(34px, 3.4vw, 48px);
  --size-h2: clamp(26px, 2.6vw, 36px);
  --size-h3: 22px;
  --r-stage: 32px;
  --r-stage-mobile: 24px;
  --r-card: 20px;
  --r-btn: 14px;
  --r-field: 9px;
  --r-focus: 6px;
  --r-pill: 999px;
  --r-round: 50%;
  --gutter: 64px;
  --shell-pad: var(--gutter);
  --head-h: 76px;
  --stack-scale: 1;
  --content-width: 1152px;
  --reading-width: 800px;
  --header-width: 1280px;
  --space-section: 112px;
  --motion-time: 500ms;
  --motion-ease: cubic-bezier(.2, .7, .3, 1);
  --layer-header: 50;
  --layer-menu: 52;
  --layer-veil: 40;
  --layer-fab: 30;
}

*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
html.nav-open { overflow: hidden; }
body {
  margin: 0;
  background: var(--c-bg);
  color: var(--c-ink);
  font-family: var(--font-body);
  font-size: var(--size-body);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}
[hidden] { display: none !important; }
a { color: inherit; text-decoration: none; }
button, input, select, textarea { font: inherit; }
button { cursor: pointer; }
button, input, select, textarea { max-width: 100%; }
img, svg { vertical-align: middle; max-width: 100%; }
img { height: auto; }
svg, .icon { flex-shrink: 0; }
button:disabled { cursor: not-allowed; }
a:focus-visible, button:focus-visible, summary:focus-visible, input:focus-visible, select:focus-visible, [tabindex]:focus-visible {
  outline: 2px solid var(--c-brick);
  outline-offset: 3px;
  border-radius: var(--r-focus);
}
h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: var(--weight-normal);
  text-wrap: balance;
  overflow-wrap: break-word;
}
h1 { font-size: var(--size-h1); line-height: 1.1; letter-spacing: -0.02em; }
h2 { font-size: var(--size-h2); line-height: 1.25; letter-spacing: -0.02em; }
h3 { font-size: var(--size-h3); line-height: 1.4; }
p { margin-top: 0; }
strong, b { font-weight: var(--weight-medium); }
code, pre, kbd, samp { font-family: var(--font-mono); }
code { overflow-wrap: anywhere; font-size: .9em; }
pre {
  max-width: 100%;
  min-width: 0;
  overflow-x: auto;
  padding: 24px;
  border: 1px solid var(--c-line);
  border-radius: var(--r-card);
  background: var(--c-panel);
  color: var(--c-ink);
  font-size: 13px;
  line-height: 1.8;
  -webkit-overflow-scrolling: touch;
}
pre code { font-size: inherit; overflow-wrap: normal; word-break: normal; white-space: pre; }
section, article, aside, main, nav, .grid > *, .hero__grid > * { min-width: 0; }
[id] { scroll-margin-top: 24px; }
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}
.wrap {
  width: 100%;
  max-width: calc(var(--content-width) + var(--gutter) * 2);
  margin-inline: auto;
  padding-inline: var(--gutter);
}
.reading { max-width: calc(var(--reading-width) + var(--gutter) * 2); }
.section { padding-top: var(--space-section); padding-bottom: var(--space-section); }
.section__head { max-width: 720px; margin-bottom: 40px; }
.section__head h2 { margin: 0 0 18px; }
.section__head p, .muted { color: var(--c-ink-soft); }
.keep { white-space: nowrap; }
.text-link, .prose a { color: var(--c-link); text-underline-offset: 4px; }
.text-link:hover, .prose a:hover { text-decoration: underline; }
.prose { overflow-wrap: break-word; }
.prose h2 { margin-top: 64px; margin-bottom: 24px; }
.prose h3 { margin-top: 36px; margin-bottom: 16px; }
.prose p, .prose ul, .prose ol { margin-bottom: 24px; line-height: 1.9; }
.prose li + li { margin-top: 8px; }
.prose :not(pre) > code { background: var(--c-panel); color: var(--c-ink); border-radius: var(--r-focus); padding: 2px 5px; }
.grid { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 24px; }
.card, .panel {
  border: 1px solid var(--c-line);
  border-radius: var(--r-card);
  padding: 32px;
  background: var(--c-bg);
  color: var(--c-ink);
  min-width: 0;
}
.card h3 { margin: 0 0 16px; }
.card p:last-child { margin-bottom: 0; }
.panel { background: var(--c-panel); color: var(--c-ink); border-radius: var(--r-stage); }
.actions { display: flex; flex-wrap: wrap; gap: 12px; margin-top: 32px; }
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 9px;
  min-height: 50px;
  padding: 10px 24px;
  border-radius: var(--r-btn);
  font-size: 15.5px;
  font-weight: var(--weight-medium);
  letter-spacing: .005em;
  line-height: 1.5;
  text-align: center;
  border: 1px solid var(--c-line-strong);
  background: var(--c-bg);
  color: var(--c-ink);
}
.btn__icon { width: 16px; height: 16px; flex: none; }
.btn--solid { background: var(--c-brick); color: var(--on-brick); border-color: var(--c-brick); }
.btn--solid:hover, .btn--solid.is-hover, .btn--solid:active { background: var(--c-brick-deep); color: var(--on-brick); border-color: var(--c-brick-deep); }
.btn--line:hover, .btn--line.is-hover { background: var(--c-panel); color: var(--c-ink); }
.btn:disabled, .btn[aria-disabled="true"] { background: var(--c-panel-2); color: var(--c-ink-soft); border-color: var(--c-line); }
.btn.is-focus { outline: 2px solid var(--c-brick); outline-offset: 3px; }
.reveal { opacity: 1; transform: none; }
html.reveal-ready .reveal:not(.shown) { opacity: 0; transform: translateY(16px); }
html.reveal-ready .reveal { transition: opacity var(--motion-time) var(--motion-ease), transform var(--motion-time) var(--motion-ease); }
.reveal.shown { opacity: 1; transform: none; }

/* 独立页头版心，不复用阅读版心。 */
.masthead { position: relative; z-index: var(--layer-header); background: var(--c-bg); color: var(--c-ink); border-bottom: 1px solid var(--c-line); }
.masthead__row {
  position: relative;
  width: 100%;
  max-width: min(100%, calc(var(--header-width) + var(--gutter) * 2));
  height: var(--head-h);
  margin-inline: auto;
  padding-inline: var(--gutter);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 32px;
}
.brand { display: inline-flex; align-items: center; gap: 10px; flex-shrink: 0; font-size: 17px; font-weight: var(--weight-medium); letter-spacing: -.01em; }
.brand__mark { width: 28px; height: 28px; flex: none; }
.mainnav { margin-left: auto; min-width: 0; }
.mainnav__list { display: flex; align-items: center; list-style: none; margin: 0; padding: 0; gap: 32px; }
.mainnav__link { font-size: 15px; color: var(--c-ink-soft); white-space: nowrap; }
.mainnav__link:hover, .mainnav__link[aria-current="page"] { color: var(--c-ink); }
.mainnav__link[aria-current="page"] { font-weight: var(--weight-medium); }
.masthead__tools { display: flex; align-items: center; gap: 28px; flex-shrink: 0; }
.masthead__rule { width: 1px; height: 18px; background: var(--c-line); flex: none; }
.language { position: relative; }
.langswitch { appearance: none; border: 0; background: var(--c-clear); color: var(--c-ink); padding: 10px 0; font-size: 14.5px; white-space: nowrap; min-height: 44px; }
.language__list {
  position: absolute;
  right: 0;
  top: calc(100% + 8px);
  width: 190px;
  margin: 0;
  padding: 8px;
  list-style: none;
  border: 1px solid var(--c-line);
  border-radius: var(--r-btn);
  background: var(--c-bg);
  color: var(--c-ink);
  z-index: var(--layer-menu);
}
.language__list a { display: block; min-height: 44px; padding: 10px 12px; border-radius: var(--r-field); }
.language__list a:hover { background: var(--c-panel); color: var(--c-ink); }
.language__list a[aria-current="true"] { color: var(--c-brick); font-weight: var(--weight-medium); }
.menu-toggle { display: none; min-width: 44px; min-height: 44px; align-items: center; justify-content: center; border: 1px solid var(--c-line); border-radius: var(--r-field); background: var(--c-bg); color: var(--c-ink); padding: 10px; }
.menu-toggle svg { width: 22px; height: 22px; }
.mobile-nav {
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  padding: 16px var(--gutter) 24px;
  background: var(--c-bg);
  color: var(--c-ink);
  border-bottom: 1px solid var(--c-line);
  max-height: calc(100dvh - var(--head-h));
  overflow-y: auto;
  overscroll-behavior: contain;
  z-index: var(--layer-menu);
}
.mobile-nav ul { list-style: none; margin: 0; padding: 0; }
.mobile-nav a { display: block; width: 100%; min-height: 44px; padding: 12px 8px; }
.mobile-nav a[aria-current] { color: var(--c-brick); font-weight: var(--weight-medium); }
.mobile-nav__languages { border-top: 1px solid var(--c-line); margin-top: 16px; padding-top: 12px; }
.nav-veil { position: fixed; inset: 0; z-index: var(--layer-veil); border: 0; background: var(--veil); color: var(--c-ink); cursor: default; }

/* 已确认的左文案、右展示台首屏。装置保持静态。 */
.hero { height: clamp(720px, calc(100vh - var(--head-h) - 1px), 900px); overflow: hidden; overflow-x: clip; }
.hero__grid {
  max-width: 1440px;
  height: 100%;
  margin-inline: auto;
  padding: 32px var(--shell-pad) 0;
  display: grid;
  grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
  column-gap: 64px;
}
.hero__copy { align-self: center; padding-bottom: 40px; }
.tagline { display: inline-flex; align-items: center; gap: 9px; margin: 0; padding: 6px 13px 6px 11px; border: 1px solid var(--c-line); border-radius: var(--r-pill); font-size: 13px; line-height: 1.4; color: var(--c-ink-soft); letter-spacing: .01em; }
.tagline__dot { width: 7px; height: 7px; border-radius: var(--r-round); background: var(--c-brick); flex: none; }
.hero__title { margin: 28px 0 0; font-weight: var(--weight-normal); font-size: var(--size-h1); line-height: 1.1; letter-spacing: -.02em; color: var(--c-ink); }
.hero__title-line { display: block; }
.hero__lead { margin: 22px 0 0; max-width: 29em; font-size: 16.5px; line-height: 1.75; color: var(--c-ink-soft); }
.hero__lead strong { color: var(--c-ink); font-weight: var(--weight-medium); }
.protocols { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; margin: 22px 0 0; padding: 0; list-style: none; }
.protocols__label { margin-right: 4px; font-size: 12.5px; color: var(--c-ink-soft); }
.protocols__chip { padding: 4px 10px; border: 1px solid var(--c-line); border-radius: var(--r-pill); background: var(--c-panel); color: var(--c-ink); font-family: var(--font-mono); font-size: 12px; line-height: 1.5; }
.platforms { display: flex; flex-wrap: wrap; gap: 10px 26px; max-width: 460px; margin: 30px 0 0; padding: 22px 0 0; border-top: 1px solid var(--c-line); list-style: none; }
.platforms__link { display: inline-flex; align-items: center; gap: 8px; font-size: 13.5px; color: var(--c-ink-soft); }
.platforms__link:hover { color: var(--c-ink); }
.platforms__icon { width: 15px; height: 15px; flex: none; }
.hero__visual { position: relative; min-width: 0; }
.stage {
  position: relative;
  height: calc(100% + 56px);
  margin: 0;
  border-radius: var(--r-stage);
  background: var(--c-brick);
  color: var(--on-brick);
  box-shadow: inset 0 1px 0 var(--stage-highlight);
  overflow: hidden;
  isolation: isolate;
}
.stage__fact { position: absolute; top: 28px; right: 28px; z-index: 2; display: inline-flex; align-items: center; gap: 8px; padding: 6px 14px; border: 1px solid var(--glass-edge); border-radius: var(--r-pill); background: var(--glass-chip); color: var(--on-brick); font-size: 12.5px; line-height: 1.5; -webkit-backdrop-filter: blur(8px); backdrop-filter: blur(8px); }
.stage__fact-mono { font-family: var(--font-mono); font-size: 12px; }
.stage__fact-sep { color: var(--on-brick-faint); }
.stack { position: absolute; left: 50%; top: max(84px, calc((100% - 660px) / 2)); width: 616px; height: 604px; transform: translateX(-50%) rotate(-2deg) scale(var(--stack-scale)); transform-origin: 50% 0; }
.win { position: absolute; width: 520px; border: 1px solid var(--glass-edge); border-radius: var(--r-card); color: var(--on-brick); -webkit-backdrop-filter: blur(12px) saturate(115%); backdrop-filter: blur(12px) saturate(115%); }
.win--back { left: 0; top: 0; height: 420px; background: var(--glass-back); color: var(--on-brick); }
.win--mid { left: 48px; top: 176px; height: 340px; background: var(--glass-mid); color: var(--on-brick); }
.win--front { left: 96px; top: 342px; background: var(--glass-front); color: var(--on-brick); }
.win__bar { display: grid; grid-template-columns: 1fr auto 1fr; align-items: center; height: 40px; padding: 0 16px; border-bottom: 1px solid var(--glass-rule); }
.win__dots { display: flex; gap: 7px; }
.win__dot { width: 9px; height: 9px; flex: none; border-radius: var(--r-round); background: var(--glass-dot-1); }
.win__dot:nth-child(2) { background: var(--glass-dot-2); }
.win__dot:nth-child(3) { background: var(--glass-dot-3); }
.win__title { font-size: 12.5px; line-height: 1; color: var(--on-brick-muted); letter-spacing: .01em; white-space: nowrap; }
.win__form { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 12px 16px; padding: 14px 16px 16px; }
.win__field { display: grid; gap: 6px; min-width: 0; }
.win__label { font-size: 11.5px; line-height: 16px; color: var(--on-brick-muted); }
.win__input { display: flex; align-items: center; height: 30px; padding: 0 10px; border: 1px solid var(--glass-field-edge); border-radius: var(--r-field); background: var(--glass-field); font-size: 12px; color: var(--on-brick); }
.win__input--hint { color: var(--on-brick-faint); }
.win__input--mono { font-family: var(--font-mono); }
.win__switchbox { display: flex; align-items: center; height: 30px; }
.win__code { margin: 0; padding: 14px 18px 16px; border: 0; border-radius: 0; background: var(--c-clear); color: var(--on-brick); font-family: var(--font-mono); font-size: 12px; line-height: 20px; white-space: pre; overflow: hidden; }
.tk-p { color: var(--on-brick-punct); }
.tk-s { color: var(--on-brick-muted); }
.win__rows { margin: 0; padding: 4px 18px 10px; list-style: none; }
.win__row { display: flex; align-items: center; justify-content: space-between; gap: 16px; height: 40px; font-size: 12.5px; color: var(--on-brick); }
.win__row + .win__row { border-top: 1px solid var(--glass-rule); }
.win__row .win__input { width: 96px; justify-content: flex-end; }
.win__select { display: flex; align-items: center; justify-content: space-between; width: 120px; height: 28px; padding: 0 10px; border: 1px solid var(--glass-field-edge); border-radius: var(--r-field); background: var(--glass-field); color: var(--on-brick); font-family: var(--font-mono); font-size: 12px; }
.win__caret { color: var(--on-brick-muted); font-family: var(--font-body); }
.tgl { position: relative; display: inline-block; width: 34px; height: 20px; border-radius: var(--r-pill); border: 1px solid var(--glass-toggle-edge); flex: none; }
.tgl::after { content: ""; position: absolute; top: 2px; width: 14px; height: 14px; border-radius: var(--r-round); }
.tgl--on { background: var(--on-brick); border-color: var(--on-brick); }
.tgl--on::after { left: 16px; background: var(--c-brick); }
.tgl--off { background: var(--c-clear); }
.tgl--off::after { left: 2px; background: var(--glass-toggle-knob); }

/* 页脚 */
.site-footer { margin-top: 48px; border-top: 1px solid var(--c-line); background: var(--c-bg); color: var(--c-ink); }
.footer__grid { display: grid; grid-template-columns: minmax(0, 1.4fr) minmax(0, .8fr) minmax(0, 1.3fr) minmax(0, .7fr); gap: 40px; padding-top: 64px; padding-bottom: 48px; }
.footer__intro { max-width: 28em; margin-top: 20px; color: var(--c-ink-soft); font-size: 14px; }
.footer__title { margin: 0 0 18px; font-size: 14px; font-weight: var(--weight-medium); }
.footer__links { list-style: none; padding: 0; margin: 0; }
.footer__links a { display: inline-block; padding-top: 5px; padding-bottom: 5px; font-size: 14px; color: var(--c-ink-soft); overflow-wrap: break-word; }
.footer__links a:hover { color: var(--c-ink); text-decoration: underline; text-underline-offset: 4px; }
.footer__links a[aria-current="true"] { color: var(--c-brick); }
.footer__bottom { border-top: 1px solid var(--c-line); padding-top: 24px; padding-bottom: 28px; display: flex; flex-wrap: wrap; gap: 16px 28px; align-items: center; justify-content: space-between; font-size: 13px; color: var(--c-ink-soft); }
.footer__bottom p { margin: 0; }
.footer__legal { display: flex; flex-wrap: wrap; gap: 24px; }

/* 静态设计预览 */
.preview-section + .preview-section { border-top: 1px solid var(--c-line); }
.swatches { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 16px; }
.swatch { margin: 0; min-width: 0; border: 1px solid var(--c-line); border-radius: var(--r-btn); overflow: hidden; background: var(--c-bg); color: var(--c-ink); }
.swatch__paint { height: 72px; border-bottom: 1px solid var(--c-line); background: var(--sample-color); }
.swatch figcaption { padding: 12px; font-family: var(--font-mono); font-size: 12px; overflow-wrap: anywhere; }
.swatch--bg { --sample-color: var(--c-bg); }
.swatch--panel { --sample-color: var(--c-panel); }
.swatch--panel2 { --sample-color: var(--c-panel-2); }
.swatch--line { --sample-color: var(--c-line); }
.swatch--strong { --sample-color: var(--c-line-strong); }
.swatch--brick { --sample-color: var(--c-brick); }
.swatch--deep { --sample-color: var(--c-brick-deep); }
.swatch--ink { --sample-color: var(--c-ink); }
.swatch--soft { --sample-color: var(--c-ink-soft); }
.swatch--link { --sample-color: var(--c-link); }
.swatch--success { --sample-color: var(--c-success); }
.swatch--warn { --sample-color: var(--c-warn); }
.swatch--error { --sample-color: var(--c-error); }
.swatch--success-ink { --sample-color: var(--c-success-ink); }
.swatch--warn-ink { --sample-color: var(--c-warn-ink); }
.swatch--error-ink { --sample-color: var(--c-error-ink); }
.glass-samples { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 12px; padding: 24px; background: var(--c-ink); color: var(--on-brick); border-radius: var(--r-card); }
.glass-samples div { padding: 14px; border: 1px solid var(--glass-edge); border-radius: var(--r-field); overflow-wrap: anywhere; font-size: 12px; }
.glass-samples__back { background: var(--glass-back); color: var(--on-brick); }
.glass-samples__mid { background: var(--glass-mid); color: var(--on-brick); }
.glass-samples__front { background: var(--glass-front); color: var(--on-brick); }
.type-sample { margin-bottom: 24px; }
.type-sample--display { font-size: var(--size-h1); line-height: 1.1; font-weight: var(--weight-normal); }
.type-sample--mono { font-family: var(--font-mono); }
.preview-note { margin-top: 20px; color: var(--c-ink-soft); font-size: 14px; }

@media (max-width: 1360px) {
  :root { --stack-scale: .9; }
  .mainnav__list { gap: 26px; }
}
@media (max-width: 1024px) {
  .mainnav { display: none; }
  .masthead__tools { margin-left: auto; gap: 16px; }
  .masthead__rule { display: none; }
  .menu-toggle { display: inline-flex; }
}
@media (min-width: 1025px) {
  .mobile-nav, .nav-veil { display: none !important; }
}
@media (max-width: 1200px) {
  :root { --gutter: 40px; --stack-scale: .8; }
  .hero__grid { column-gap: 44px; }
}
@media (max-width: 1024px) {
  .hero { height: auto; }
  .hero__grid { grid-template-columns: minmax(0, 1fr); row-gap: 48px; padding-top: 48px; }
  .hero__copy { padding-bottom: 0; }
  .stage { height: auto; padding: 84px 24px 88px; margin-bottom: -32px; }
  .stack { position: relative; left: auto; top: auto; width: auto; max-width: 540px; height: auto; margin: 0 auto; transform: rotate(-1.5deg); transform-origin: 50% 50%; }
  .win { position: relative; left: auto; top: auto; width: auto; height: auto; }
  .win--back { display: none; }
  .win--mid { margin-right: 28px; }
  .win--front { margin: -18px 0 0 28px; }
  .footer__grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 768px) {
  :root { --size-h1: clamp(24px, 4vw, 30px); --space-section: 72px; }
  .grid { grid-template-columns: minmax(0, 1fr); }
  .swatches { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (max-width: 640px) {
  :root { --gutter: 20px; }
  .masthead__row { gap: 12px; }
  .brand { gap: 7px; font-size: 15px; }
  .masthead__tools { margin-left: auto; gap: 8px; }
  .langswitch { font-size: 13px; }
  .hero__title { font-size: clamp(26px, 7.4vw, 30px); }
  .hero__lead { font-size: 15.5px; }
  .hero__title-line { white-space: normal; }
  .actions .btn { flex: 1 1 auto; }
  .stage { padding: 76px 14px 80px; border-radius: var(--r-stage-mobile); }
  .stage__fact { right: auto; left: 16px; top: 22px; max-width: calc(100% - 32px); font-size: 11px; padding-inline: 10px; gap: 5px; }
  .stage__fact-mono { font-size: 11px; }
  .stack, .tilt, [data-tilt] { transform: none; }
  .win--mid { margin-right: 14px; }
  .win--front { margin-left: 14px; }
  .win__code { font-size: 10.5px; line-height: 18px; padding: 12px 14px; overflow-x: auto; }
  .win__rows { padding-inline: 12px; }
  .win__row { font-size: 12px; gap: 8px; }
  .win__bar { padding-inline: 12px; }
  .win__dots { gap: 5px; }
  .win__dot { width: 7px; height: 7px; }
  .card, .panel { padding: 24px; }
  .footer__grid { gap: 32px 24px; }
  .footer__brand { grid-column: 1 / -1; }
  .glass-samples { grid-template-columns: minmax(0, 1fr); }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after { animation: none !important; transition: none !important; }
  html.reveal-ready .reveal:not(.shown) { opacity: 1; transform: none; }
}