/* Piupiu 官网：暖白纸色、墨黑文字、单线条插画（和 logo 同样的圆头等粗笔画）。
 * 版式参考 Notion：大量留白、左对齐的段落、线条图标；各区块之间统一一条细线，留白一致。
 * 主按钮和产品界面一致（绿色、圆角矩形）。产品画面是在线体验的实时界面（iframe），不用截图。
 * 动效只用透明度、位移和线条描绘，不固定页面、不劫持滚动，尊重「减少动态效果」。 */
:root {
  --paper: #f4f2ec;
  --paper-2: #ece9e1;
  --card: #fdfcf9;
  --ink: #1b1b1a;
  --ink-2: #45443f;
  --muted: #7b7870;
  --line: #e2ded3;
  --line-2: #cfc9bb;
  --green: #1b9658;
  --green-2: #158450;
  --hl: #f6d86b;
  --nav: 64px;
  --font: -apple-system, BlinkMacSystemFont, "SF Pro Text", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Segoe UI", Inter, sans-serif;
  --mono: ui-monospace, "SF Mono", Menlo, Consolas, monospace;
  --ease: cubic-bezier(.2, .7, .2, 1);
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: var(--nav); -webkit-text-size-adjust: 100%; }
body { margin: 0; background: var(--paper); color: var(--ink); font: 17px/1.7 var(--font); -webkit-font-smoothing: antialiased; }
img { display: block; max-width: 100%; height: auto; }
h1, h2, h3 { text-wrap: balance; }
p, dd, li { text-wrap: pretty; }   /* 避免段尾只剩一个字 */
a { color: inherit; text-decoration: none; }
.wrap { width: min(1160px, calc(100% - 48px)); margin: 0 auto; }

/* 导航 */
.nav { position: sticky; top: 0; z-index: 10; background: rgba(244, 242, 236, .84); backdrop-filter: saturate(1.4) blur(14px); -webkit-backdrop-filter: saturate(1.4) blur(14px); border-bottom: 1px solid transparent; transition: border-color .2s; }
.nav.scrolled { border-bottom-color: var(--line); }
.nav-in { height: var(--nav); display: flex; align-items: center; gap: 32px; }
.brand { display: inline-flex; align-items: center; gap: 10px; font-weight: 650; font-size: 18px; letter-spacing: -.01em; }
.mark { width: 30px; height: 30px; display: inline-grid; place-items: center; color: var(--ink); }
.mark svg { width: 100%; height: 100%; display: block; }
.mark .piu, .hand .piu { animation: piu 3.6s ease-in-out infinite; }
@keyframes piu { 0%, 70%, 100% { opacity: 1; transform: none; } 78% { opacity: .15; transform: translateX(-2px); } 86% { opacity: 1; transform: translateX(1.5px); } }
.links { display: flex; gap: 26px; font-size: 15px; color: var(--ink-2); }
.links a { position: relative; }
.links a::after { content: ""; position: absolute; left: 0; right: 0; bottom: -4px; height: 1.5px; background: var(--ink); transform: scaleX(0); transform-origin: 0 50%; transition: transform .25s var(--ease); }
.links a:hover::after { transform: scaleX(1); }
.nav-right { margin-left: auto; display: flex; align-items: center; gap: 8px; }
/* 图标按钮：图标是块级元素，在圆形热区里上下左右居中 */
.ico-btn { width: 36px; height: 36px; display: grid; place-items: center; border-radius: 999px; color: var(--ink-2); transition: background .15s, color .15s; }
.ico-btn:hover { background: var(--paper-2); color: var(--ink); }
.ico-btn > span { width: 19px; height: 19px; display: block; }
[data-icon] svg { width: 100%; height: 100%; display: block; }
.ico-btn.is-empty, .foot-col a.is-empty { opacity: .45; cursor: default; }
.lang { display: inline-flex; padding: 3px; border-radius: 10px; background: var(--paper-2); margin: 0 6px; }
.lang button { border: 0; background: none; font: 600 13px var(--font); color: var(--muted); padding: 4px 10px; border-radius: 7px; cursor: pointer; }
.lang button.on { background: var(--card); color: var(--ink); box-shadow: 0 1px 2px rgba(0, 0, 0, .06); }

/* 按钮：主按钮绿色、圆角矩形（和产品界面里的「连接钱包」一致） */
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; height: 46px; padding: 0 22px; border-radius: 10px; font-weight: 600; font-size: 15px; white-space: nowrap; cursor: pointer; transition: transform .15s, box-shadow .15s, background .15s, color .15s; }
.btn-sm { height: 36px; padding: 0 14px; border-radius: 9px; font-size: 14px; }
.btn-primary { background: var(--green); color: #fff; box-shadow: 0 6px 16px -10px rgba(27, 150, 88, .9); }
.btn-primary:hover { background: var(--green-2); transform: translateY(-1px); }
.btn-ghost { background: var(--card); color: var(--ink); box-shadow: inset 0 0 0 1px var(--line-2); }
.btn-ghost:hover { box-shadow: inset 0 0 0 1px var(--ink-2); transform: translateY(-1px); }
.btn .bi { width: 16px; height: 16px; display: block; flex: none; transition: transform .2s var(--ease); }
.btn:hover .bi[data-icon="arrow"] { transform: translateX(3px); }
.text-link { display: inline-flex; align-items: center; gap: 6px; font-size: 14.5px; font-weight: 500; color: var(--ink-2); border-bottom: 1px solid var(--line-2); padding-bottom: 1px; transition: color .15s, border-color .15s; }
.text-link:hover { color: var(--ink); border-color: var(--ink); }

/* 区块：统一的上边细线和留白 */
.sec { border-top: 1px solid var(--line); padding: 112px 0; }
.head { max-width: 720px; margin: 0 0 56px; }
.eyebrow { display: inline-block; font-size: 14px; font-weight: 600; color: var(--green); }
h2 { font-size: clamp(32px, 4.2vw, 48px); line-height: 1.14; letter-spacing: -.03em; margin: 12px 0 0; font-weight: 700; }
.sub { margin: 18px 0 0; font-size: 18px; color: var(--ink-2); max-width: 640px; }
.mark-word { position: relative; display: inline-block; white-space: nowrap; }
.mark-word svg { position: absolute; left: -2%; right: -2%; bottom: -.12em; width: 104%; height: .32em; overflow: visible; z-index: 0; }
.mark-word path { fill: none; stroke: var(--hl); stroke-width: 7; stroke-linecap: round; stroke-dasharray: 1; stroke-dashoffset: 1; transition: stroke-dashoffset 1.1s var(--ease) .25s; }
.mark-word > span { position: relative; z-index: 1; }
.in .mark-word path, .mark-word.in path { stroke-dashoffset: 0; }

/* 首屏 */
.hero { padding: 96px 0 88px; }
.hero-text { text-align: center; }
h1 { font-size: clamp(40px, 6vw, 72px); line-height: 1.1; letter-spacing: -.035em; font-weight: 700; margin: 0; }
.lead { max-width: 660px; margin: 26px auto 0; font-size: 19px; color: var(--ink-2); }
.cta { margin-top: 36px; display: flex; gap: 12px; justify-content: center; flex-wrap: wrap; }
.os { margin-top: 16px; font-size: 13px; color: var(--muted); }

/* 产品窗口：里面是实时界面（在线体验的嵌入画面），载入前先显示同一画面的 2 倍图 */
.stage { perspective: 1600px; padding: 64px 24px 0; }
.window { margin: 0 auto; max-width: 1160px; border-radius: 14px; overflow: hidden; background: var(--card);
  border: 1px solid var(--line); box-shadow: 0 40px 90px -42px rgba(48, 38, 12, .38), 0 16px 32px -24px rgba(48, 38, 12, .2); }
.window[data-tilt] { will-change: transform; transition: transform .28s cubic-bezier(.22,.61,.36,1); transform: rotateX(calc((1 - var(--t, 1)) * 14deg)) scale(calc(.92 + var(--t, 1) * .08)) translateY(calc((1 - var(--t, 1)) * 30px)); transform-origin: 50% 0; }
.window[data-tilt].flat { transform: none; }   /* 放平后去掉变换，图片按原始清晰度绘制 */
.window-bar { height: 34px; display: flex; align-items: center; gap: 7px; padding: 0 12px 0 14px; background: var(--paper-2); border-bottom: 1px solid var(--line); }
.window-bar i { width: 11px; height: 11px; border-radius: 50%; background: #d9d4c8; }
.window-bar > span { margin-left: 10px; font-size: 12.5px; color: var(--muted); }
.window-open { margin-left: auto; display: inline-flex; align-items: center; gap: 5px; font-size: 12.5px; font-weight: 500; color: var(--ink-2); padding: 3px 9px; border-radius: 7px; transition: background .15s, color .15s; }
.window-open:hover { background: var(--card); color: var(--ink); }
.window-open .wi { width: 12px; height: 12px; display: block; }
.shot { position: relative; aspect-ratio: 1280 / 800; background: var(--card); overflow: hidden; }
.shot img.shot-img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; object-position: left top; display: block; }

/* 四个数字：数字和两行说明在同一行 */
.glance { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); margin-top: 56px; }
.g { display: flex; align-items: center; gap: 16px; padding: 2px 24px; border-left: 1px solid var(--line); min-width: 0; }
.g:first-child { border-left: 0; padding-left: 0; }
.g b { flex: none; min-width: .62em; font-size: 40px; line-height: 1; font-weight: 700; letter-spacing: -.04em; font-variant-numeric: tabular-nums; }
.g strong { display: block; font-size: 15px; font-weight: 600; line-height: 1.4; }
.g span { display: block; margin-top: 3px; font-size: 13.5px; line-height: 1.5; color: var(--muted); }

/* 功能：四页，每页上面一段文字 + 要点，下面一个完整的实时界面窗口 */
.feats { display: grid; gap: 120px; }
.feat-head { display: grid; grid-template-columns: minmax(0, 1.15fr) minmax(0, .85fr); gap: 64px; align-items: end; margin-bottom: 36px; }
.feat-idx { display: inline-flex; align-items: baseline; gap: 10px; font-size: 14px; font-weight: 600; color: var(--green); }
.feat-idx b { color: var(--muted); font-weight: 600; font-variant-numeric: tabular-nums; }
.feat h3 { font-size: clamp(26px, 2.6vw, 34px); line-height: 1.2; letter-spacing: -.02em; margin: 10px 0 0; }
.feat-copy p { margin: 14px 0 0; font-size: 17px; color: var(--ink-2); }
.feat-head .ticks { margin: 0; padding-bottom: 4px; }
.ticks { list-style: none; padding: 0; margin: 18px 0 0; display: grid; gap: 10px; font-size: 15.5px; color: var(--ink-2); }
.ticks li { position: relative; padding-left: 28px; }
.ticks li::before { content: ""; position: absolute; left: 0; top: 4px; width: 17px; height: 17px; border-radius: 50%; background: rgba(27, 150, 88, .14) url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 18 18'%3E%3Cpath d='M5 9.5l2.6 2.4L13 6.5' fill='none' stroke='%231b9658' stroke-width='1.8' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E") center / 17px no-repeat; }

/* 安全 / 开源：左文右图；每条说明配一个线条图标 */
.security, .oss { display: grid; grid-template-columns: minmax(0, 1.05fr) minmax(0, .95fr); gap: 80px; align-items: center; }
.facts { margin: 44px 0 0; display: grid; grid-template-columns: 1fr 1fr; gap: 34px 40px; }
.facts > div { display: grid; grid-template-columns: 44px 1fr; grid-template-rows: auto 1fr; column-gap: 14px; align-content: start; }
.fi, .si { width: 44px; height: 44px; display: block; color: var(--ink); }
.fi { grid-row: 1 / span 2; }
.facts dt { font-weight: 650; font-size: 17px; line-height: 1.4; margin-top: 2px; }
.facts dd { margin: 4px 0 0; color: var(--ink-2); font-size: 15px; line-height: 1.6; }
.diagram { margin: 0; }
.diagram svg { width: 100%; height: auto; overflow: visible; }
.draw path, .draw rect, .draw circle:not(.pkt) { fill: none; stroke: var(--ink); stroke-width: 2.4; stroke-linecap: round; stroke-linejoin: round; stroke-dasharray: 1; stroke-dashoffset: 1; transition: stroke-dashoffset 1.4s var(--ease); }
.draw .hand path { stroke-width: 3.4; }
.draw .flow { stroke: var(--green); stroke-width: 2.6; transition-delay: .6s; }
.draw .nope rect, .draw .nope path { stroke: #b8b2a4; transition-delay: .9s; }
.draw .nope .x { stroke: #d4443d; stroke-width: 3; transition-delay: 1.5s; }
.draw .dash { stroke: #b8b2a4; stroke-dasharray: 0.02 0.03; stroke-dashoffset: 0; opacity: 0; transition: opacity .6s 1.2s; }
.in .draw path, .in .draw rect, .in .draw circle:not(.pkt) { stroke-dashoffset: 0; }
.in .draw .dash { opacity: 1; }
.draw .pkt { fill: var(--green); stroke: none; }
.draw .pkt-no { fill: #b8b2a4; }
.draw .pkts { opacity: 0; transition: opacity .5s; }
.in .draw .pkts { opacity: 1; transition-delay: 1.8s; }
.in .draw .nope .x { animation: nope 2.6s 2.4s ease-in-out infinite; }
@keyframes nope { 0%, 40%, 100% { opacity: 1; } 50% { opacity: .35; } 60% { opacity: 1; } }
.diagram text { font: 500 13px var(--font); fill: var(--ink-2); opacity: 0; transition: opacity .6s .9s; }
.diagram text.t-muted { fill: var(--muted); text-decoration: line-through; }
.in .draw text { opacity: 1; }

/* 线条图标：圆头等粗，和 logo 同一种笔画；局部用荧光黄点缀 */
.lic { fill: none; stroke: currentColor; stroke-width: 2.2; stroke-linecap: round; stroke-linejoin: round; }
.lic .hl { fill: var(--hl); stroke: none; }

/* 小人插画：头发等用墨黑实色，局部荧光黄；前景（手臂）用纸色填充盖住后面的线 */
.ill-fig { margin: 0; }
.ill-fig svg { display: block; width: 100%; height: auto; overflow: visible; }
.ill { fill: none; stroke: var(--ink); stroke-width: 3; stroke-linecap: round; stroke-linejoin: round; }
.ill .ink { fill: var(--ink); stroke: none; }
.ill .hl { fill: var(--hl); stroke: none; }
.ill .paper { fill: var(--paper); }
.ill .mask { stroke: var(--paper); stroke-width: 10; }
.ill .go { stroke: var(--green); stroke-dasharray: 3 7; }
.ill .spark { fill: var(--hl); stroke-width: 2.4; }
.ill .lens { fill: rgba(246, 216, 107, .38); }

/* 开源：右边是仓库结构卡片，右下角一个拿放大镜的小人 */
.oss { align-items: start; }
.repo { border-radius: 16px; background: var(--card); border: 1px solid var(--line); box-shadow: 0 30px 60px -40px rgba(48, 38, 12, .35); padding: 8px 26px 14px; }
.repo-head { display: flex; align-items: center; gap: 10px; padding: 14px 0; border-bottom: 1px solid var(--line); font-weight: 650; font-size: 15px; }
.repo-head .bi { width: 18px; height: 18px; display: block; }
.repo-tag { margin-left: 4px; font-size: 12px; font-weight: 600; color: var(--green); background: rgba(27, 150, 88, .12); padding: 1px 8px; border-radius: 6px; }
.repo-row { display: grid; grid-template-columns: 112px 1fr; gap: 16px; align-items: baseline; padding: 11px 0; border-bottom: 1px dashed var(--line); }
.repo-row:last-child { border-bottom: 0; }
.repo-row code { font: 600 14px var(--mono); color: var(--ink); }
.repo-row span { font-size: 14px; color: var(--muted); line-height: 1.5; }
.oss-side { padding: 8px 0 0; }
.oss-foot { display: flex; align-items: flex-start; gap: 20px; margin-top: 18px; }
.oss-note { flex: 1; margin: 6px 0 0; font-size: 13.5px; line-height: 1.65; color: var(--muted); }
.ill-review { flex: none; width: 170px; margin: -64px -18px 0 0; position: relative; }   /* 小人站在卡片右下角，放大镜对着卡片 */
.oss-cta { display: flex; align-items: center; gap: 20px; flex-wrap: wrap; margin-top: 40px; }

/* 下载：两种方式并排，中间一条细线（不做成卡片） */
.head-row { display: flex; align-items: flex-end; justify-content: space-between; gap: 48px; margin-bottom: 56px; }
.head-row .head { margin: 0; }
.ill-scan { flex: none; width: 300px; margin-right: 8px; }
.ways { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); border-top: 1.5px solid var(--ink); }
.way { min-width: 0; padding: 36px 56px 8px 0; }
.way + .way { padding: 36px 0 8px 56px; border-left: 1px solid var(--line-2); }
.way h3 { margin: 0; font-size: 24px; letter-spacing: -.015em; }
.way-sub { margin: 8px 0 0; color: var(--ink-2); font-size: 16px; }
.vsteps { list-style: none; margin: 26px 0 0; padding: 0; display: grid; gap: 18px; }
.vsteps li { display: grid; grid-template-columns: 44px 1fr; gap: 14px; align-items: center; }
.vsteps b { display: block; font-size: 16.5px; line-height: 1.4; }
.vsteps div span { display: block; color: var(--ink-2); font-size: 15px; line-height: 1.6; }
.req { margin: 22px 0 0; font-size: 13.5px; color: var(--muted); line-height: 1.6; }
.way-cta { margin-top: 24px; display: flex; align-items: center; gap: 18px; flex-wrap: wrap; }
.code { margin: 24px 0 0; padding: 14px 18px; border-radius: 12px; background: var(--card); border: 1px solid var(--line); font: 13.5px/1.75 var(--mono); color: var(--ink); overflow-x: auto; white-space: pre; }
.c-mute { color: var(--muted); user-select: none; }
.way .ticks { font-size: 15px; }

/* 常见问题：标题和插画一行，问题分两列（整块随页面滚动，不固定） */
.faq-cols { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 1fr); gap: 0 56px; align-items: start; }
.ill-faq { flex: none; width: 400px; margin-right: 4px; }
.ill-faq .bulb .glass { fill: var(--paper); transition: fill .3s; }
.ill-faq .rays { opacity: 0; transition: opacity .3s; }
.ill-faq .bulb { transform-box: fill-box; transform-origin: 50% 100%; }
.ill-faq .bubble { transform-box: fill-box; transform-origin: 0% 100%; transition: transform .3s var(--ease), opacity .3s; }
.ill-faq .steam { animation: steam 2.4s ease-in-out infinite; }
@keyframes steam { 0%, 100% { opacity: .9; transform: none; } 50% { opacity: .35; transform: translateY(-2px); } }
.faq-sec.has-open .ill-faq .glass { fill: var(--hl); }
.faq-sec.has-open .ill-faq .rays { opacity: 1; }
.faq-sec.has-open .ill-faq .bulb { animation: pop .45s var(--ease); }
.faq-sec.has-open .ill-faq .bubble { transform: scale(.88); opacity: .55; }
@keyframes pop { 0% { transform: scale(.85); } 60% { transform: scale(1.08); } 100% { transform: none; } }
.qa { border-bottom: 1px solid var(--line); }
.qa:first-child { border-top: 1px solid var(--line); }
.qa button { all: unset; box-sizing: border-box; width: 100%; cursor: pointer; display: flex; justify-content: space-between; align-items: center; gap: 20px; padding: 21px 2px; font-weight: 600; font-size: 17px; }
.qa button i { position: relative; flex: none; width: 14px; height: 14px; }
.qa button i::before, .qa button i::after { content: ""; position: absolute; left: 0; right: 0; top: 6px; height: 2px; border-radius: 2px; background: var(--ink-2); transition: transform .3s var(--ease); }
.qa button i::after { transform: rotate(90deg); }
.qa.open button i::after { transform: rotate(0deg); }
.qa button:focus-visible { outline: 2px solid var(--ink); outline-offset: 4px; border-radius: 6px; }
.ans { display: grid; grid-template-rows: 0fr; transition: grid-template-rows .35s var(--ease); }
.ans > p { overflow: hidden; margin: 0; color: var(--ink-2); padding: 0 40px 0 2px; }
.qa.open .ans { grid-template-rows: 1fr; }
.qa.open .ans > p { padding-bottom: 22px; }

/* 页脚 */
.foot { border-top: 1px solid var(--line); padding: 80px 0 36px; }
.foot-cta { display: flex; align-items: center; justify-content: space-between; gap: 32px; flex-wrap: wrap; padding-bottom: 56px; border-bottom: 1px solid var(--line); }
.foot-hi { display: flex; align-items: center; gap: 22px; }
.foot-mark { width: 64px; height: 64px; display: block; color: var(--ink); flex: none; }
.foot-mark svg { width: 100%; height: 100%; display: block; }
.foot-cta h2 { margin: 0; font-size: clamp(28px, 3.4vw, 40px); }
.foot-cta p { margin: 8px 0 0; font-size: 16.5px; color: var(--ink-2); }
.foot-btns { display: flex; gap: 12px; flex-wrap: wrap; }
.foot-grid { display: grid; grid-template-columns: 1.6fr 1fr 1fr 1fr 1fr; gap: 32px; padding: 48px 0 44px; }
.foot-brand p { margin: 12px 0 0; font-size: 14.5px; color: var(--muted); }
.foot-col { display: grid; gap: 10px; align-content: start; font-size: 14.5px; color: var(--ink-2); }
.foot-col h4 { margin: 0 0 4px; font-size: 13px; font-weight: 600; color: var(--muted); }
.foot-col a { justify-self: start; display: inline-flex; align-items: center; gap: 8px; transition: color .15s; }
.foot-col a:hover { color: var(--ink); }
.fl-ico { width: 14px; height: 14px; display: block; }
/* 最底一行：左边版权，右边一行风险提示 */
.foot-legal { display: flex; justify-content: space-between; align-items: center; gap: 32px; padding-top: 22px; border-top: 1px solid var(--line); font-size: 12.5px; color: var(--muted); }
.foot-legal p { margin: 0; }
.copy { white-space: nowrap; }
@media (min-width: 1101px) { .risk { white-space: nowrap; } }

/* 进入视口时浮现 */
.reveal { opacity: 0; transform: translateY(14px); transition: opacity .7s var(--ease), transform .7s var(--ease); }
.reveal.in { opacity: 1; transform: none; }

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  .reveal { opacity: 1; transform: none; transition: none; }
  .window[data-tilt] { transform: none; transition: none; }
  .mark .piu, .hand .piu, .ill-faq .steam { animation: none; }
  .mark-word path, .draw path, .draw rect, .draw circle:not(.pkt) { stroke-dashoffset: 0; transition: none; }
  .draw .dash, .draw text { opacity: 1; }
  .draw .pkts { display: none; }
  .in .draw .nope .x, .faq-sec.has-open .ill-faq .bulb { animation: none; }
}

/* 窄屏：不载入实时界面，窗口里显示同一画面的 2 倍图 */
@media (max-width: 960px) {
  .links { display: none; }
  .sec { padding: 88px 0; }
  .glance { grid-template-columns: 1fr 1fr; row-gap: 28px; }
  .g:nth-child(3) { border-left: 0; padding-left: 0; }
  .feats { gap: 88px; }
  .feat-head { grid-template-columns: minmax(0, 1fr); gap: 4px; margin-bottom: 28px; }
  .feat-head .ticks { margin-top: 18px; }
  .security, .oss { grid-template-columns: minmax(0, 1fr); gap: 56px; }
  .ways { grid-template-columns: minmax(0, 1fr); }
  .way, .way + .way { padding: 32px 0 8px; border-left: 0; }
  .way + .way { margin-top: 32px; border-top: 1px solid var(--line-2); }
  .faq-cols { grid-template-columns: minmax(0, 1fr); }
  .faq-cols .faq + .faq .qa:first-child { border-top: 0; }
  .ill-faq { width: 320px; }
  .foot-grid { grid-template-columns: 1fr 1fr; }
  .foot-brand { grid-column: 1 / -1; }
  .foot-legal { flex-direction: column; align-items: flex-start; gap: 8px; }
}
@media (max-width: 600px) {
  .wrap { width: calc(100% - 32px); }
  .nav-right .btn, .nav-right .ico-btn, .window-open { display: none; }
  .hero { padding: 64px 0 72px; }
  .lead { font-size: 17px; }
  .stage { padding: 44px 16px 0; }
  .facts { grid-template-columns: 1fr; }
  .glance { grid-template-columns: 1fr; }
  .g { border-left: 0; padding-left: 0; }
  .g b { font-size: 36px; }
  .foot-hi { align-items: flex-start; }
  .head-row { display: block; }
  .ill-scan { width: 220px; margin: 32px 0 0; }
  .ill-review { width: 130px; margin-top: -40px; margin-right: 0; }
  .ill-faq { width: 100%; max-width: 340px; margin: 28px 0 0; }
}

/* 下载按钮组（下载区）：三个平台并排，按钮里写平台和版本 / 大小 */
.dl-grid { margin-top: 24px; display: grid; grid-template-columns: 1fr; gap: 8px; max-width: 420px; }
.dl-grid .btn { justify-content: space-between; text-align: left; padding: 11px 16px; height: auto; gap: 12px; }
.dl-t { display: grid; gap: 2px; min-width: 0; }
.dl-t b { font-weight: 600; font-size: 15px; }
.dl-t small { font-size: 12.5px; font-weight: 400; opacity: .72; }
.dl-grid .btn .bi { flex: none; width: 18px; height: 18px; }
.way-note { margin-top: 14px; display: flex; align-items: center; gap: 18px; flex-wrap: wrap; color: var(--muted); font-size: 13.5px; }