:root {
  --page: #e8f4fc; --band: #dceef9; --card: #ffffff; --ink: #0b2436; --mute: #4f6f85;
  --accent: #0d72a8; --accent-press: #0a5a85; --on-accent: #ffffff; --line: #d3e4ef; --ok: #1f7a4d;
  --radius: 16px; --max: 1080px;
  --sans: "Avenir Next", "PingFang SC", "Hiragino Sans", "Hiragino Sans GB", "Apple SD Gothic Neo", "Microsoft YaHei UI", -apple-system, sans-serif;
  --display: "Iowan Old Style", Palatino, "Songti SC", "Noto Serif SC", "Hiragino Mincho ProN", serif;
  --mono: "SF Mono", ui-monospace, Menlo, monospace;
}
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --page: #0e1a24; --band: #122431; --card: #15242f; --ink: #e6f1f8; --mute: #8aa5b8;
    --accent: #4fb3e8; --accent-press: #7cc7f0; --on-accent: #04202f; --line: #263c4d; --ok: #6fd3a0;
  }
}
* { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body { margin: 0; background: var(--page); color: var(--ink); font: 17px/1.65 var(--sans); }
a { color: var(--accent); }
img, video { max-width: 100%; height: auto; }
main, .top, footer { width: 100%; max-width: var(--max); margin: 0 auto; padding-left: 20px; padding-right: 20px; }
.top { display: flex; align-items: center; justify-content: space-between; gap: 12px; padding-top: 18px; padding-bottom: 18px; flex-wrap: wrap; }
.brand { display: inline-flex; align-items: center; gap: 10px; font: 600 24px/1 var(--display); color: var(--ink); text-decoration: none; }
.brand img { border-radius: 7px; }
nav a { margin-left: 26px; color: var(--mute); text-decoration: none; font-size: 15px; font-weight: 500; }
nav a:hover, nav a[aria-current] { color: var(--ink); }
h1, h2, h3 { font-family: var(--display); text-wrap: balance; }
h1 { font-size: clamp(32px, 4.2vw, 52px); line-height: 1.18; margin: 0 0 20px; letter-spacing: -0.01em; }
h1 { text-wrap: pretty; }
h2 { font-size: clamp(26px, 3.4vw, 38px); line-height: 1.25; margin: 0 0 14px; text-align: center; }
h3 { font-size: 19px; margin: 0 0 8px; }
.hero { display: grid; grid-template-columns: minmax(0, 1fr) minmax(0, 480px); gap: 56px; align-items: center; padding: 44px 0 88px; }
.eyebrow { display: inline-block; margin: 0 0 18px; padding: 4px 12px; border-radius: 999px; background: var(--band); color: var(--accent); font-size: 13px; font-weight: 600; }
.lead { font-size: clamp(18px, 2vw, 20px); color: var(--mute); margin: 0 0 28px; max-width: 34em; }
.cta { display: flex; flex-wrap: wrap; gap: 12px; margin: 0 0 14px; }
.btn { display: inline-block; padding: 13px 26px; border-radius: 999px; border: 1px solid var(--line); background: var(--card); color: var(--ink); text-decoration: none; font-weight: 600; font-size: 16px; text-align: center; }
.btn:hover { border-color: var(--accent); }
.btn.primary { background: var(--accent); border-color: var(--accent); color: var(--on-accent); }
.btn.primary:hover { background: var(--accent-press); border-color: var(--accent-press); }
.btn.big { padding: 18px 54px; font-size: 19px; }
.btn.disabled { opacity: .5; cursor: default; pointer-events: none; }
.block-btn { display: block; width: 100%; }
.small { font-size: 14px; color: var(--mute); }
.center { text-align: center; }
.sub { text-align: center; color: var(--mute); margin: 0 auto 34px; max-width: 40em; }

/* 应用窗口示意（纯 CSS，不是截图） */
.window { background: var(--page); border: 1px solid var(--line); border-radius: 14px; box-shadow: 0 28px 56px -16px rgba(11, 36, 54, .28); overflow: hidden; }
.window-bar { display: flex; gap: 8px; padding: 12px 16px; background: var(--card); }
.window-bar i { width: 12px; height: 12px; border-radius: 50%; background: #ff5f57; }
.window-bar i:nth-child(2) { background: #febc2e; } .window-bar i:nth-child(3) { background: #28c840; }
.window-body { padding: 14px 18px 20px; }
.window-brand { display: flex; align-items: center; gap: 8px; margin: 0 0 12px; font: 600 16px var(--display); }
.window-brand img { border-radius: 5px; }
.window ul { list-style: none; margin: 0; padding: 0; display: grid; gap: 10px; }
.window li { display: flex; gap: 14px; align-items: center; background: var(--card); border-radius: 10px; padding: 12px 16px; }
.window li > div { flex: 1; min-width: 0; }
.window b { display: block; font-size: 15px; line-height: 1.35; }
.window small { display: block; color: var(--mute); font-size: 12px; }
.tag { font-size: 12px; font-weight: 700; color: var(--mute); width: 2.4em; flex: none; }
.bar { display: block; height: 3px; border-radius: 2px; background: var(--line); margin-top: 8px; }
.bar u { display: block; height: 100%; border-radius: 2px; background: var(--accent); }

.block { padding: 84px 0; }
.band { background: var(--band); margin: 0 calc(50% - 50vw); padding-left: calc(50vw - 50%); padding-right: calc(50vw - 50%); }
.grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(230px, 1fr)); gap: 18px; margin-top: 34px; }
.grid article, .card { background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 24px; }
.grid p, .card p { margin: 0; color: var(--mute); font-size: 15px; }
.steps { list-style: none; counter-reset: s; margin: 34px 0 0; padding: 0; display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); gap: 20px; }
.steps li { counter-increment: s; background: var(--card); border: 1px solid var(--line); border-radius: var(--radius); padding: 26px; display: flex; flex-direction: column; gap: 6px; }
.steps li::before { content: counter(s); font: 600 38px/1 var(--display); color: var(--accent); }
.steps strong { font-size: 20px; } .steps span { color: var(--mute); font-size: 15px; }

.fit { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 20px; margin-top: 34px; }
.ticks { list-style: none; padding: 0; margin: 10px 0 0; display: grid; gap: 10px; }
.ticks li { position: relative; padding-left: 26px; font-size: 15.5px; line-height: 1.55; }
.ticks li::before { content: "✓"; position: absolute; left: 0; color: var(--ok); font-weight: 700; }
.ticks.no li::before, .ticks li.no::before { content: "–"; color: var(--mute); }
.ticks li.no { color: var(--mute); }

.editions { display: grid; grid-template-columns: repeat(auto-fit, minmax(320px, 1fr)); gap: 24px; align-items: start; }
.edition { background: var(--card); border: 1px solid var(--line); border-radius: 20px; padding: 34px; display: flex; flex-direction: column; gap: 14px; }
.edition.featured, .card.featured { border: 2px solid var(--accent); }
.edition h3 { font-size: 26px; margin: 0; display: flex; align-items: center; gap: 10px; flex-wrap: wrap; }
.chip { font: 700 12px var(--sans); background: var(--accent); color: var(--on-accent); padding: 3px 10px; border-radius: 999px; }
.price { margin: 0; } .price b { font: 600 44px/1.1 var(--display); color: var(--ink); } .price span { color: var(--mute); font-size: 16px; }
.edition .ticks { margin: 6px 0 10px; }

.privacy { display: flex; align-items: center; justify-content: space-between; gap: 28px; flex-wrap: wrap; }
.privacy h2 { text-align: left; font-size: 30px; } .privacy p { margin: 0; color: var(--mute); max-width: 40em; }

details { border-bottom: 1px solid var(--line); padding: 16px 0; max-width: 820px; margin: 0 auto; }
details:first-of-type { border-top: 1px solid var(--line); }
summary { cursor: pointer; font-weight: 600; font-size: 18px; }
details p { margin: 10px 0 0; color: var(--mute); }

/* 下载页 */
.center-hero { display: block; text-align: center; padding-bottom: 64px; }
.center-hero .lead { margin-left: auto; margin-right: auto; }
.dl-card { max-width: 720px; margin: 0 auto 22px; background: var(--card); border: 2px solid var(--accent); border-radius: 24px; padding: 40px 44px; display: flex; flex-direction: column; align-items: center; gap: 18px; }
.dl-card .cta { justify-content: center; margin: 0; }
.dl-head { display: flex; align-items: center; gap: 18px; text-align: left; }
.dl-head img { border-radius: 17px; } .dl-head h2 { text-align: left; margin: 0 0 2px; font-size: 28px; }
.reqs { list-style: none; margin: 0; padding: 0; display: flex; flex-wrap: wrap; gap: 8px 22px; justify-content: center; color: var(--mute); font-size: 14px; }
.reqs li::before { content: "✓ "; color: var(--ok); font-weight: 700; }
.sha { margin: 0; padding: 8px 14px; border-radius: 8px; background: var(--band); font-size: 12px; color: var(--mute); max-width: 100%; overflow-wrap: anywhere; }
.sha code { font-family: var(--mono); color: var(--ink); }
.notice { margin: 0; padding: 10px 14px; border-radius: 10px; background: var(--band); }
.trio { display: grid; grid-template-columns: repeat(auto-fit, minmax(260px, 1fr)); gap: 20px; align-items: stretch; }
.trio .card { display: flex; flex-direction: column; gap: 10px; }
.trio .card .block-btn { margin-top: auto; }
.trio .price b { font-size: 38px; }

.doc { max-width: 760px; margin: 0 auto; padding: 32px 0 48px; }
.doc h1 { font-size: clamp(30px, 5vw, 42px); } .doc h2 { margin-top: 36px; text-align: left; } .doc li { margin: 4px 0; }
.table-wrap { overflow-x: auto; border: 1px solid var(--line); border-radius: var(--radius); background: var(--card); }
table { border-collapse: collapse; width: 100%; font-size: 15px; }
th, td { text-align: left; padding: 10px 14px; border-bottom: 1px solid var(--line); vertical-align: top; }
tr:last-child td { border-bottom: 0; }
th { color: var(--mute); font-weight: 600; background: var(--band); }
footer { padding-top: 28px; padding-bottom: 48px; color: var(--mute); font-size: 14px; text-align: center; border-top: 1px solid var(--line); margin-top: 32px; }
.lang-switch a { margin: 0 8px; color: var(--mute); text-decoration: none; }

@media (max-width: 860px) {
  .hero { grid-template-columns: 1fr; gap: 36px; padding: 24px 0 56px; }
  nav a { margin-left: 16px; }
  .block { padding: 56px 0; }
  .dl-card { padding: 30px 22px; }
  .edition { padding: 26px; }
  .privacy { align-items: flex-start; }
}

/* PuStudio product navigation, added during domain migration. */
.studio-return{max-width:1080px;padding:14px 20px 0;margin:0 auto;font-size:12px}.studio-return a{text-decoration:none;color:var(--mute)}.studio-return a:hover{color:var(--accent)}