:root {
  --bg: #f6f5f1;
  --bg-panel: #ffffff;
  --bg-panel-2: #0f3a3c;
  --border: #e3e1db;
  --accent: #7b55d4;
  --accent-dark: #5c3db0;
  --text: #1c1f1e;
  --text-muted: #5f6562;
  --success: #1f8a6a;
  --warn: #b7791f;
  --error: #c2413a;
  --ink-teal: #0a2426;
  --field-mid: #1d5b57;
  --field-end: #2f8378;
  --on-dark: #ffffff;
  --on-dark-dim: #a9b8b5;
  --on-dark-soft: rgba(226,236,233,.74);
  --line-on-dark: rgba(169,184,181,.18);
  --line-on-dark-strong: rgba(226,236,233,.26);
  --wash-on-dark: rgba(255,255,255,.06);
  --accent-soft: #ece6f9;
  --accent-wash: rgba(123,85,212,.10);
  --success-halo: rgba(31,138,106,.55);
  --paper: #f9f8f5;
  --paper-bar: #efeee9;
  --code-gutter: #b2afa6;
  --hairline: rgba(15,58,60,.08);
  --btn-inset: rgba(255,255,255,.16);
  --blob-a: rgba(140,206,190,.16);
  --blob-core: rgba(8,36,38,.34);
  --blob-c: rgba(123,85,212,.12);
  --orbit-line: rgba(236,244,242,.16);
  --orbit-dot: rgba(236,244,242,.62);
  --orbit-text: rgba(236,244,242,.56);
  --veil: rgba(10,36,38,.36);
  --clear: transparent;
  --shadow-float: 0 1px 2px rgba(15,58,60,.10),0 24px 48px rgba(15,58,60,.16);
  --shadow-window: 0 1px 2px rgba(15,58,60,.14),0 24px 48px rgba(6,32,34,.30);
  --shadow-btn: 0 1px 2px rgba(15,58,60,.24);
  --r-panel: 28px;
  --r-float: 16px;
  --r-btn: 10px;
  --r-pill: 999px;
  --r-shot: 8px;
  --r-tab: 8px;
  --r-mark: 8px;
  --r-chip: 4px;
  --font-display: "Inter","Noto Sans SC","PingFang SC","Hiragino Sans","Apple SD Gothic Neo","Microsoft YaHei",system-ui,sans-serif;
  --font-body: "Inter","Noto Sans SC","PingFang SC","Hiragino Sans","Apple SD Gothic Neo","Microsoft YaHei",system-ui,sans-serif;
  --font-mono: "JetBrains Mono",ui-monospace,"SF Mono",Menlo,Consolas,monospace;
  --size-body: 16px;
  --size-small: 13px;
  --weight-normal: 400;
  --weight-medium: 500;
  --weight-strong: 600;
  --nav-h: 64px;
  --gutter: 40px;
  --gutter-x: max(80px,calc((100vw - 1280px) / 2));
  --reading-width: 1120px;
  --section-gap: 140px;
  --ease-out: cubic-bezier(.2,.7,.2,1);
  --duration: .2s;
}
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; scroll-padding-top: 24px; }
html.nav-open { overflow: hidden; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-body);
  font-size: var(--size-body);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
main, section, article, aside, div, nav, li { min-width: 0; }
img { max-width: 100%; }
svg { flex-shrink: 0; }
button, input, select, textarea { font: inherit; }
button { cursor: pointer; }
a { color: inherit; text-decoration: none; }
button, a { -webkit-tap-highlight-color: var(--accent-wash); }
:focus-visible { outline: 2px solid var(--accent); outline-offset: 3px; border-radius: var(--r-chip); }
[hidden] { display: none !important; }
h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: var(--weight-normal);
  line-height: 1.2;
  letter-spacing: -.02em;
  text-wrap: balance;
  overflow-wrap: break-word;
}
h1 { font-size: clamp(34px,3.5vw,48px); }
h2 { font-size: clamp(26px,2.6vw,38px); }
h3 { font-size: clamp(20px,1.8vw,26px); }
p { margin-block: 0 1em; }
strong { font-weight: var(--weight-strong); }
code { font-family: var(--font-mono); font-size: .88em; overflow-wrap: anywhere; }
pre {
  max-width: 100%;
  overflow-x: auto;
  padding: 24px;
  border: 1px solid var(--border);
  border-radius: var(--r-btn);
  background: var(--paper);
  color: var(--text);
  font-family: var(--font-mono);
  font-size: 14px;
  line-height: 1.8;
  overscroll-behavior-inline: contain;
}
pre code { font-size: inherit; white-space: pre; overflow-wrap: normal; word-break: normal; }
.wrap {
  width: 100%;
  max-width: calc(var(--reading-width) + var(--gutter) * 2);
  margin-inline: auto;
  padding-inline: var(--gutter);
}
.section { padding-top: var(--section-gap); padding-bottom: var(--section-gap); }
.section + .section { padding-top: 0; }
.stack > * + * { margin-top: 24px; }
.cluster { display: flex; flex-wrap: wrap; align-items: center; gap: 12px; }
.grid-two { display: grid; grid-template-columns: repeat(2,minmax(0,1fr)); gap: 24px; }
.grid-two > *, .grid-three > * { min-width: 0; }
.grid-three { display: grid; grid-template-columns: repeat(3,minmax(0,1fr)); gap: 24px; }
.keep { white-space: nowrap; }
.muted { color: var(--text-muted); }
.eyebrow { font-size: 13px; color: var(--accent-dark); letter-spacing: .02em; }
.text-link { color: var(--accent-dark); border-bottom: 1px solid var(--accent-wash); padding-bottom: 2px; }
.text-link:hover { border-bottom-color: var(--accent); }
.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
  border: 0;
}
.skip-link {
  position: absolute;
  left: var(--gutter);
  top: 8px;
  z-index: 50;
  padding: 12px 20px;
  background: var(--bg-panel);
  color: var(--accent-dark);
  border-radius: var(--r-btn);
  clip-path: inset(50%);
  width: 1px;
  height: 1px;
  overflow: hidden;
  white-space: nowrap;
}
.skip-link:focus {
  clip-path: none;
  width: auto;
  height: auto;
  overflow: visible;
}
.btn {
  display: inline-flex;
  justify-content: center;
  align-items: center;
  gap: 10px;
  min-height: 48px;
  max-width: 100%;
  padding: 11px 20px;
  border: 1px solid var(--clear);
  border-radius: var(--r-btn);
  background: var(--bg-panel);
  color: var(--text);
  font-size: 15px;
  font-weight: var(--weight-medium);
  line-height: 1.6;
  letter-spacing: -.005em;
  text-align: center;
  transition: background-color var(--duration),border-color var(--duration),color var(--duration);
}
.btn svg { width: 17px; height: 17px; }
.btn--primary {
  background: var(--accent);
  color: var(--on-dark);
  box-shadow: inset 0 1px 0 var(--btn-inset),var(--shadow-btn);
}
.btn--primary:hover, .btn--primary.is-hover { background: var(--accent-dark); color: var(--on-dark); }
.btn--secondary { background: var(--bg-panel); color: var(--accent-dark); border-color: var(--border); }
.btn--secondary:hover { background: var(--accent-soft); color: var(--accent-dark); }
.btn--ghost { background: var(--clear); color: var(--on-dark); border-color: var(--line-on-dark-strong); padding-inline: 18px 16px; }
.btn--ghost:hover { background: var(--wash-on-dark); color: var(--on-dark); }
.btn--ghost svg { width: 15px; height: 15px; color: var(--on-dark-dim); }
.btn:disabled, .btn[aria-disabled="true"] { background: var(--border); color: var(--text-muted); box-shadow: none; cursor: not-allowed; }
.card, .panel {
  padding: 28px;
  background: var(--bg-panel);
  color: var(--text);
  border-radius: var(--r-float);
  border: 1px solid var(--border);
}
.panel { border-radius: var(--r-panel); padding: 48px; }
.panel--dark { background: var(--bg-panel-2); color: var(--on-dark); border-color: var(--line-on-dark); overflow-x: clip; }
.panel--dark .muted { color: var(--on-dark-soft); }
.panel--dark .text-link { color: var(--on-dark); border-bottom-color: var(--on-dark-dim); }
.card--float { border-color: var(--hairline); box-shadow: var(--shadow-float); }
.card h3, .panel h2 { margin-top: 0; }
.prose { max-width: 76ch; }
.prose > * { min-width: 0; }
.prose h2 { margin-top: 2.5em; scroll-margin-top: 24px; }
.prose h3 { margin-top: 1.8em; }
.prose p, .prose li { line-height: 1.85; }
.prose a { color: var(--accent-dark); text-decoration: underline; text-underline-offset: 4px; }
.prose li + li { margin-top: 8px; }
.prose blockquote { margin-inline: 0; }
.reveal { opacity: 1; transform: none; }
html.reveal-ready .reveal:not(.shown) { opacity: 0; transform: translateY(12px); }
.reveal { transition: opacity .6s var(--ease-out),transform .6s var(--ease-out); }
.reveal.shown { opacity: 1; transform: none; }

/* 独立的宽页头版心，不复用阅读版心。 */
.topbar { height: var(--nav-h); background: var(--bg); color: var(--text); border-bottom: 1px solid var(--border); position: relative; z-index: 30; }
.topbar__inner {
  position: relative;
  height: 100%;
  width: 100%;
  max-width: min(100%,calc(1280px + var(--gutter) * 2));
  padding-inline: var(--gutter);
  margin-inline: auto;
  display: flex;
  align-items: center;
  gap: 32px;
}
.brand { display: inline-flex; align-items: center; gap: 11px; flex-shrink: 0; }
.brand__mark { display: block; width: 30px; height: 30px; border-radius: var(--r-mark); background: var(--bg-panel); color: var(--text); border: 1px solid var(--border); box-shadow: var(--shadow-btn); flex-shrink: 0; }
.brand__name { font-size: 15.5px; font-weight: var(--weight-medium); letter-spacing: -.01em; color: var(--text); }
.mainnav { min-width: 0; margin-left: auto; }
.mainnav__list { display: flex; align-items: center; list-style: none; margin: 0; padding: 0; gap: 4px; }
.mainnav__link { display: inline-flex; align-items: center; min-height: 34px; padding: 5px 14px; border-radius: var(--r-pill); font-size: 14.5px; color: var(--text-muted); white-space: nowrap; }
.mainnav__link:hover { color: var(--text); }
.mainnav__link.is-current { background: var(--accent-soft); color: var(--accent-dark); font-weight: var(--weight-medium); }
.header-tools { display: flex; align-items: center; gap: 8px; flex-shrink: 0; }
.language-picker { position: relative; }
.lang { display: inline-flex; align-items: center; justify-content: center; gap: 6px; min-height: 34px; padding: 6px 12px; border: 1px solid var(--border); border-radius: var(--r-btn); background: var(--bg-panel); color: var(--text); font-size: 13.5px; white-space: nowrap; }
.lang svg { width: 14px; height: 14px; color: var(--text-muted); }
.lang__caret { font-size: 11px; color: var(--text-muted); }
.lang__short { display: none; }
.language-menu { position: absolute; top: calc(100% + 10px); right: 0; width: 190px; padding: 8px; margin: 0; list-style: none; border-radius: var(--r-float); border: 1px solid var(--border); background: var(--bg-panel); color: var(--text); box-shadow: var(--shadow-float); z-index: 35; }
.language-menu a { display: flex; align-items: center; min-height: 44px; padding: 8px 14px; border-radius: var(--r-btn); }
.language-menu a:hover, .language-menu [aria-current="true"] { background: var(--accent-soft); color: var(--accent-dark); }
.menu-toggle { display: none; align-items: center; justify-content: center; min-width: 44px; min-height: 44px; padding: 8px; border: 1px solid var(--border); border-radius: var(--r-btn); background: var(--bg-panel); color: var(--text); }
.menu-toggle svg { width: 21px; height: 21px; }
.mobile-drawer { display: none; }
.menu-veil { position: fixed; inset: var(--nav-h) 0 0; z-index: 20; border: 0; background: var(--veil); color: var(--on-dark); }
.site-footer { padding-top: 72px; padding-bottom: 32px; background: var(--bg-panel-2); color: var(--on-dark); overflow-x: clip; }
.footer-grid { display: grid; grid-template-columns: 1.4fr .8fr 1.4fr; gap: 48px; }
.site-footer .brand__name { color: var(--on-dark); }
.site-footer p { color: var(--on-dark-soft); margin-top: 20px; }
.site-footer h2 { font-size: 15px; margin-top: 0; }
.footer-links { display: grid; gap: 10px; margin: 0; padding: 0; list-style: none; }
.footer-links a, .footer-languages a { color: var(--on-dark-soft); }
.footer-links a:hover, .footer-languages a:hover { color: var(--on-dark); text-decoration: underline; text-underline-offset: 4px; }
.footer-languages { display: flex; flex-wrap: wrap; gap: 12px 20px; padding-top: 40px; }
.footer-bottom { margin-top: 32px; padding-top: 24px; border-top: 1px solid var(--line-on-dark); display: flex; flex-wrap: wrap; gap: 12px 24px; font-size: 13px; color: var(--on-dark-soft); }
.footer-bottom p { margin: 0; }
.footer-legal { display: flex; flex-wrap: wrap; gap: 20px; }

/* 用户确认的分屏配置文档首屏。 */
.hero { display: grid; grid-template-columns: 46fr 54fr; min-height: clamp(680px,calc(100vh - var(--nav-h) - 56px),820px); background: var(--ink-teal); color: var(--on-dark); overflow-x: clip; }
.lead { background: var(--ink-teal); color: var(--on-dark-soft); padding: 72px 56px 72px var(--gutter-x); display: flex; flex-direction: column; justify-content: center; }
.kicker { align-self: flex-start; display: inline-flex; align-items: center; gap: 10px; min-height: 30px; padding: 4px 13px 4px 11px; border: 1px solid var(--line-on-dark); border-radius: var(--r-pill); font-size: 13px; color: var(--on-dark-soft); letter-spacing: .01em; margin: 0; }
.kicker__dot { position: relative; width: 7px; height: 7px; flex-shrink: 0; border-radius: var(--r-pill); background: var(--success); }
.kicker__dot::after { content: ""; position: absolute; inset: 0; border-radius: var(--r-pill); background: var(--success-halo); opacity: 0; animation: breathe 2.6s var(--ease-out) infinite; }
.lead__title { margin: 30px 0 0; font-weight: var(--weight-normal); font-size: clamp(34px,calc(2.2vw + 16px),48px); line-height: 1.17; letter-spacing: -.02em; }
.lead__title-dim { display: block; color: var(--on-dark-dim); }
.lead__title-key { display: block; color: var(--on-dark); }
.lead__desc { margin: 22px 0 0; max-width: 33em; font-size: 16.5px; line-height: 1.78; color: var(--on-dark-soft); }
.lead__desc strong { color: var(--on-dark); font-weight: var(--weight-medium); }
.lead__actions { margin-top: 34px; display: flex; flex-wrap: wrap; gap: 12px; }
.platforms { margin: 40px 0 0; padding: 24px 0 0; border-top: 1px solid var(--line-on-dark); display: flex; flex-wrap: wrap; align-items: center; gap: 14px 22px; list-style: none; }
.platforms__item { display: inline-flex; align-items: center; gap: 7px; font-size: 13.5px; color: var(--on-dark-soft); }
.platforms__item svg { width: 15px; height: 15px; color: var(--on-dark-dim); }
.platforms__item:hover { color: var(--on-dark); }
.platforms__price { display: inline-flex; flex-wrap: wrap; align-items: center; gap: 6px; min-height: 28px; padding: 3px 12px; border: 1px solid var(--line-on-dark); border-radius: var(--r-pill); font-size: 12.5px; color: var(--on-dark-dim); }
.platforms__price b { font-weight: var(--weight-medium); color: var(--on-dark); }
.platforms__sep { color: var(--on-dark-dim); }
.field { position: relative; overflow: hidden; background: radial-gradient(58% 46% at 16% 10%,var(--blob-a),var(--clear) 72%),radial-gradient(44% 38% at 94% 84%,var(--blob-c),var(--clear) 72%),radial-gradient(70% 60% at 66% 58%,var(--blob-core),var(--clear) 74%),linear-gradient(145deg,var(--bg-panel-2) 0%,var(--field-mid) 56%,var(--field-end) 100%); color: var(--on-dark); }
.orbit { position: absolute; inset: 0; width: 100%; height: 100%; pointer-events: none; }
.orbit__ring { fill: none; stroke: var(--orbit-line); stroke-width: 1; }
.orbit__ring--outer { stroke-dasharray: 2 7; }
.orbit__dot { fill: var(--orbit-dot); }
.orbit__label { font-family: var(--font-mono); font-size: 11px; letter-spacing: .04em; fill: var(--orbit-text); }
.conf { position: absolute; left: 9.5%; top: 17%; width: max(760px,100%); height: 780px; background: var(--paper); color: var(--text); border-radius: var(--r-float); box-shadow: var(--shadow-window); animation: rise .55s var(--ease-out) both; }
.conf__bar { height: 40px; display: flex; align-items: flex-end; gap: 6px; padding: 0 14px; background: var(--paper-bar); color: var(--text); border-bottom: 1px solid var(--border); border-radius: var(--r-float) var(--r-float) 0 0; }
.conf__tab { display: inline-flex; align-items: center; gap: 8px; height: 31px; padding: 0 14px 0 12px; margin-bottom: -1px; background: var(--paper); color: var(--text); border: 1px solid var(--border); border-bottom-color: var(--paper); border-radius: var(--r-tab) var(--r-tab) 0 0; font-family: var(--font-mono); font-size: 12.5px; }
.conf__tab svg { width: 13px; height: 13px; color: var(--accent); }
.conf__add { display: inline-flex; align-items: center; justify-content: center; width: 28px; height: 28px; margin-bottom: 2px; color: var(--text-muted); }
.conf__code { counter-reset: ln; padding: 20px 0; margin: 0; list-style: none; font-family: var(--font-mono); font-size: 14px; line-height: 30px; color: var(--text); }
.conf__code li { counter-increment: ln; display: grid; grid-template-columns: 56px 1fr; min-height: 30px; }
.conf__code li::before { content: counter(ln); padding-right: 20px; text-align: right; color: var(--code-gutter); font-size: 12.5px; }
.conf__code .ln { white-space: pre; }
.conf__code li[data-fade="1"] { opacity: .82; }
.conf__code li[data-fade="2"] { opacity: .68; }
.conf__code li[data-fade="3"] { opacity: .56; }
.conf__code li[data-fade="4"] { opacity: .46; }
.t-sec { color: var(--accent-dark); font-weight: var(--weight-medium); }
.t-val { color: var(--field-mid); }
.t-op, .t-com { color: var(--text-muted); }
.t-pol { color: var(--bg-panel-2); font-weight: var(--weight-strong); }
.conf__code li.is-hit { position: relative; z-index: 3; }
.hit { position: relative; display: inline-block; margin-left: -3px; padding: 0 3px; border-radius: var(--r-chip); background: var(--accent-wash); color: var(--text); }
.hit::after { content: ""; position: absolute; left: 3px; right: 3px; bottom: 3px; height: 2px; border-radius: var(--r-chip); background: var(--accent); transform-origin: left center; animation: draw .36s .4s var(--ease-out) both; }
.note { position: absolute; top: 40px; left: 212px; width: 344px; background: var(--bg-panel); color: var(--text); border: 1px solid var(--hairline); border-radius: var(--r-float); box-shadow: var(--shadow-float); font-family: var(--font-body); white-space: normal; line-height: 1.5; animation: lift .4s .78s var(--ease-out) both; }
.note__head { display: flex; align-items: center; justify-content: space-between; padding: 14px 14px 0 16px; }
.note__title { font-size: 12.5px; color: var(--text-muted); letter-spacing: .01em; }
.note__tools { display: flex; gap: 4px; }
.note__tool { display: inline-flex; align-items: center; justify-content: center; width: 24px; height: 24px; color: var(--text-muted); }
.note__tool--ok { color: var(--accent); }
.note__tool svg { width: 15px; height: 15px; }
.note__body { margin: 0; padding: 9px 16px 14px; font-size: 15px; line-height: 1.62; color: var(--text); }
.note__kw { font-family: var(--font-mono); font-size: 13.5px; color: var(--accent-dark); background: var(--accent-wash); padding: 1px 5px; border-radius: var(--r-chip); }
.note__pol { font-family: var(--font-mono); font-size: 13.5px; font-weight: var(--weight-strong); color: var(--bg-panel-2); }
.note__arrow { color: var(--accent); }
.note__meta { display: flex; flex-wrap: wrap; align-items: center; gap: 8px; margin: 0; padding: 0 16px 13px; font-size: 12.5px; color: var(--text-muted); }
.note__meta-dot { width: 6px; height: 6px; flex-shrink: 0; border-radius: var(--r-pill); background: var(--success); }
.note__meta code { font-size: 12px; }
.note__input { display: flex; align-items: center; gap: 9px; padding: 11px 16px 12px; border-top: 1px solid var(--border); background: var(--bg); color: var(--text-muted); border-radius: 0 0 var(--r-float) var(--r-float); font-size: 13px; }
.note__input svg { width: 13px; height: 13px; }
.note__caret { width: 1px; height: 16px; background: var(--accent); flex-shrink: 0; }
.note__input code { font-size: 12.5px; color: var(--text); }
.quick { padding: 140px var(--gutter-x); }
.quick__eyebrow { margin: 0; font-size: 13px; color: var(--accent-dark); letter-spacing: .02em; }
.quick__title { margin: 14px 0 0; font-size: clamp(24px,calc(1.4vw + 12px),34px); line-height: 1.25; }
.quick__desc { margin: 16px 0 0; max-width: 40em; color: var(--text-muted); line-height: 1.75; }
.quick__link { display: inline-flex; align-items: center; gap: 6px; margin-top: 22px; color: var(--accent-dark); font-size: 15px; border-bottom: 1px solid var(--accent-wash); padding-bottom: 2px; }
@keyframes rise { from { opacity: 0; transform: translateY(12px); } to { opacity: 1; transform: none; } }
@keyframes draw { from { transform: scaleX(0); } to { transform: scaleX(1); } }
@keyframes lift { from { opacity: 0; transform: translateY(8px); } to { opacity: 1; transform: none; } }
@keyframes breathe { 0% { opacity: .7; transform: scale(1); } 70%,100% { opacity: 0; transform: scale(2.8); } }
@media (max-width: 1080px) {
  .topbar__inner { gap: 20px; }
  .mainnav { display: none; }
  .header-tools { margin-left: auto; }
  .menu-toggle { display: inline-flex; }
  .mobile-drawer:not([hidden]) { display: block; position: absolute; top: 100%; inset-inline: 0; padding: 16px var(--gutter) 24px; background: var(--bg); color: var(--text); border-bottom: 1px solid var(--border); max-height: calc(100dvh - var(--nav-h)); overflow-y: auto; overscroll-behavior: contain; box-shadow: var(--shadow-float); }
  .mobile-drawer ul { margin: 0; padding: 0; list-style: none; }
  .mobile-drawer a { display: flex; width: 100%; align-items: center; min-height: 48px; padding: 12px 16px; border-radius: var(--r-btn); color: var(--text-muted); }
  .mobile-drawer a.is-current, .mobile-drawer a[aria-current="true"] { background: var(--accent-soft); color: var(--accent-dark); }
  .mobile-drawer__languages { margin-top: 16px !important; padding-top: 16px !important; border-top: 1px solid var(--border); }
  .preview-header .mainnav { display: block; }
  .preview-header .mainnav__link { padding-inline: 10px; font-size: 14px; }
}
@media (max-width: 1080px) { :root { --gutter-x: 40px; } }
@media (max-width: 900px) {
  :root { --gutter-x: 20px; --gutter: 24px; }
  .hero { grid-template-columns: 1fr; min-height: 0; }
  .lead { padding: 48px var(--gutter-x) 44px; }
  .lead__desc { font-size: 15.5px; }
  .field { height: 440px; }
  .conf { left: 20px; top: 44px; width: 620px; }
  .note { left: 96px; width: 290px; }
  .quick { padding: 96px var(--gutter-x); }
  .footer-grid { grid-template-columns: 1fr 1fr; gap: 32px; }
  .footer-brand { grid-column: 1 / -1; }
  .preview-header { height: auto; }
  .preview-header .topbar__inner { flex-wrap: wrap; padding-top: 12px; padding-bottom: 10px; gap: 8px 16px; }
  .preview-header .mainnav { order: 3; width: 100%; margin-left: 0; overflow-x: auto; }
  .preview-header .header-tools { margin-left: auto; }
}
@media (max-width: 768px) {
  h1, .lead__title { font-size: clamp(24px,4vw,30px); }
  .grid-three { grid-template-columns: 1fr; }
  .panel { padding: 28px; }
}
@media (max-width: 640px) {
  :root { --gutter: 20px; --section-gap: 96px; }
  .grid-two, .footer-grid { grid-template-columns: minmax(0,1fr); }
  .footer-brand { grid-column: auto; }
  .card, .panel { padding: 24px; }
  .brand__name { font-size: 13px; }
  .topbar__inner { gap: 8px; }
  .brand { gap: 8px; }
  .lang { padding-inline: 10px; min-height: 44px; }
  .lang__full { display: none; }
  .lang__short { display: inline; }
  .tilt, [data-tilt] { transform: none !important; }
  .lead { padding-top: 32px; padding-bottom: 32px; }
  .lead__title { margin-top: 22px; }
  .lead__desc { margin-top: 18px; line-height: 1.7; }
  .lead__actions { margin-top: 24px; }
  .platforms { gap: 12px 16px; margin-top: 28px; padding-top: 20px; }
  .platforms__price { font-size: 12px; }
  .site-footer { padding-bottom: 28px; }
}
@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; }
}