* { box-sizing: border-box; margin: 0; padding: 0; }
    html { line-height: 1.5; -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
    body { background: #000; color: #fff; font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif; -webkit-font-smoothing: antialiased; }
    a { color: inherit; text-decoration: none; cursor: pointer; }
    img { display: block; max-width: 100%; }
    ul { list-style: none; }
    h1, h2, h3 { font-size: inherit; }
    button { font: inherit; color: inherit; cursor: pointer; }
    a:focus-visible, button:focus-visible { outline: 2px solid #fbbf24; outline-offset: 3px; }
    .page { width: 100%; max-width: 480px; min-height: 100vh; margin-inline: auto; padding-top: 56px; overflow-x: hidden; }
    .masthead { position: fixed; inset: 0 0 auto; z-index: 100; background: #110a05c7; border-bottom: 1px solid #ffffff0f; -webkit-backdrop-filter: blur(14px); }
    .masthead nav { display: flex; justify-content: space-between; align-items: center; gap: 10px; padding: 10px 14px; }
    .brand img { width: auto; height: 44px; aspect-ratio: 557 / 161; object-fit: contain; border-radius: 4px; filter: drop-shadow(0 2px 8px #f9731673); }
    .guide-link { padding: 7px 12px; border: 1px solid #ffffff1f; border-radius: 999px; background: #ffffff0d; font-size: 12px; font-weight: 700; white-space: nowrap; }
    .loading-line { height: 3px; overflow: hidden; background: #ffffff0d; }
    .loading-line::after { content: ""; display: block; width: 100%; height: 100%; background: linear-gradient(90deg, #c2410c, #f97316 50%, #fdba74); }
    .intro { position: relative; padding: 48px 20px 28px; background: radial-gradient(at 100% 0, #f9731673, transparent 60%), radial-gradient(at 0 100%, #f973162e, transparent 60%), linear-gradient(#141414, #000); }
    .availability { display: flex; width: fit-content; align-items: center; gap: 6px; padding: 5px 10px; margin-bottom: 14px; background: #f9731626; border: 1px solid #f973164d; border-radius: 999px; color: #f97316; font-size: 11px; font-weight: 600; }
    .availability::before { content: ""; width: 6px; height: 6px; flex-shrink: 0; border-radius: 50%; background: #f97316; animation: blink 1.5s infinite; }
    @keyframes blink { 50% { opacity: .5; } }
    .intro h1 { margin-bottom: 14px; font-size: 26px; line-height: 1.25; font-weight: 800; }
    .intro h1 strong { color: #fbbf24; font-weight: inherit; }
    .intro > p { margin-bottom: 18px; color: #b3b3b3; font-size: 13px; }
    .intro-action { margin-bottom: 22px; }
    .install-button { display: inline-flex; align-items: center; justify-content: center; gap: 8px; padding: 13px 22px; border-radius: 999px; background: linear-gradient(135deg, #f97316, #c2410c); box-shadow: 0 8px 24px #f9731666; font-size: 15px; font-weight: 700; transition: transform .15s; }
    .install-button:active { transform: scale(.97); }
    .download-icon { display: block; flex: 0 0 20px; width: 20px; height: 20px; background: currentColor; clip-path: polygon(37.5% 12.5%,62.5% 12.5%,62.5% 37.5%,79.167% 37.5%,50% 66.667%,20.833% 37.5%,37.5% 37.5%,37.5% 12.5%,37.5% 75%,20.833% 75%,20.833% 83.333%,79.167% 83.333%,79.167% 75%,37.5% 75%); }
    .numbers { display: grid; grid-template-columns: repeat(4, minmax(0,1fr)); gap: 10px; }
    .numbers > div { padding: 10px 6px; text-align: center; border: 1px solid #ffffff14; border-radius: 12px; background: #ffffff0d; }
    .numbers dt { color: #fbbf24; font-size: 16px; font-weight: 800; }
    .numbers dd { margin-top: 2px; color: #b3b3b3; font-size: 10px; }
    .rule { height: 1px; margin: 8px 16px; background: linear-gradient(90deg, transparent, #ffffff1a, transparent); }
    .collection { padding: 14px 0 4px; }
    .collection-heading { display: flex; align-items: center; justify-content: space-between; padding-inline: 16px; margin-bottom: 4px; }
    .collection-heading h2, .benefits > h2 { display: flex; align-items: center; gap: 6px; font-size: 16px; font-weight: 700; }
    .section-icon { font-size: 18px; }
    .collection-heading a { color: #f97316; font-size: 11px; font-weight: 600; }
    .collection > p { margin-bottom: 10px; padding-inline: 16px; color: #b3b3b3; font-size: 11px; }
    .reel { overflow: hidden; }
    .reel ul { display: flex; gap: 10px; width: max-content; padding: 0 16px 8px; animation: slide var(--duration,20s) linear infinite; }
    .reel ul:hover, .reel ul:focus-within { animation-play-state: paused; }
    @keyframes slide { to { transform: translateX(-50%); } }
    .program { display: block; width: 130px; }
    .program figure { position: relative; width: 100%; aspect-ratio: 2 / 3; overflow: hidden; border-radius: 10px; background: #181818; }
    .program img { width: 100%; height: 100%; object-fit: cover; }
    .program h3 { margin-top: 6px; font-size: 12px; font-weight: 600; }
    .program p { margin-top: 2px; color: #b3b3b3; font-size: 10px; }
    .program h3, .program p { overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
    .tag, .quality { position: absolute; top: 6px; padding: 3px 6px; border-radius: 4px; font-size: 9px; font-weight: 700; }
    .tag { left: 6px; background: #000000b3; }
    .quality { right: 6px; background: #22c55ee6; }
    .tag.green { background: #22c55e; } .tag.orange { background: #f97316; } .tag.new { background: #ea580c; }
    .landscape { width: 240px; }
    .landscape figure { aspect-ratio: 16 / 9; }
    .overview { margin: 16px; padding: 18px; border: 1px solid #ffffff14; border-radius: 16px; background: linear-gradient(135deg, #1a1108, #261808); }
    .overview > header { display: flex; align-items: center; gap: 12px; margin-bottom: 14px; }
    .wordmark { display: flex; align-items: center; gap: 8px; padding: 8px 14px; border-radius: 10px; background: linear-gradient(135deg, #f97316, #fbbf24); font-size: 18px; font-weight: 800; }
    .wordmark b { font-weight: bolder; }
    .overview > header p { color: #b3b3b3; font-size: 13px; }
    .selling-points { display: grid; gap: 12px; margin-bottom: 16px; }
    .selling-points li { display: flex; align-items: flex-start; gap: 12px; }
    .selling-points .symbol { display: flex; align-items: center; justify-content: center; flex: 0 0 38px; height: 38px; border-radius: 10px; background: #f9731626; font-size: 22px; }
    .selling-points h3 { margin-bottom: 3px; font-size: 14px; font-weight: 700; }
    .selling-points p { color: #b3b3b3; font-size: 12px; line-height: 1.4; }
    .wide-install { display: block; padding: 14px; text-align: center; border-radius: 12px; background: linear-gradient(135deg, #f97316, #fcd34d); box-shadow: 0 6px 18px #f9731666; font-size: 15px; font-weight: 700; }
    .capabilities { display: grid; grid-template-columns: repeat(4,minmax(0,1fr)); gap: 8px; padding-inline: 16px; margin-bottom: 8px; }
    .capabilities li { display: block; padding: 10px 4px; text-align: center; border: 1px solid #ffffff0f; border-radius: 10px; background: #ffffff0a; }
    .capabilities b { display: block; margin-bottom: 2px; color: #fbbf24; font-size: 14px; }
    .capabilities span { display: block; color: #b3b3b3; font-size: 10px; line-height: 1.2; }
    .benefits { padding: 18px 16px 8px; }
    .benefits > h2 { margin-bottom: 14px; }
    .benefit-grid { display: grid; grid-template-columns: repeat(2,minmax(0,1fr)); gap: 10px; }
    .benefit-grid li { padding: 14px 12px; border: 1px solid #ffffff0f; border-radius: 12px; background: linear-gradient(135deg, #1a1108, #261808); }
    .benefit-grid .symbol { margin-bottom: 6px; font-size: 22px; }
    .benefit-grid h3 { margin-bottom: 4px; font-size: 13px; font-weight: 700; }
    .benefit-grid p { color: #b3b3b3; font-size: 11px; line-height: 1.4; }
    .comparison { padding: 16px; }
    .comparison h2 { margin-bottom: 12px; text-align: center; font-size: 18px; font-weight: 400; }
    table { width: 100%; border-collapse: collapse; border-radius: 12px; overflow: hidden; background: #181818; line-height: normal; }
    .comparison table { font-size: 12px; }
    .comparison th, .comparison td { padding: 10px 8px; border-bottom: 1px solid #ffffff0f; text-align: center; }
    .comparison th { background: #f973161a; font-weight: 700; }
    .comparison th:nth-child(2) { color: #fbbf24; }
    .comparison td:nth-child(2) { color: #4ade80; font-weight: 700; }
    .comparison td:last-child { color: #b3b3b3; }
    .comparison tr:last-child td:last-child { color: #fff; }
    .invitation { margin: 16px; padding: 22px 18px; text-align: center; border: 1px solid #f9731640; border-radius: 16px; background: linear-gradient(135deg, #f9731633, #22c55e26); }
    .invitation h2 { margin-bottom: 6px; font-size: 20px; font-weight: 400; }
    .invitation > p { margin-bottom: 16px; color: #b3b3b3; font-size: 13px; }
    .audience { display: grid; grid-template-columns: repeat(3,minmax(0,1fr)); gap: 8px; margin-bottom: 18px; }
    .audience > div { padding: 10px 6px; border-radius: 10px; background: #0000004d; }
    .audience dt { color: #fbbf24; font-size: 18px; font-weight: 800; }
    .audience dd { margin-top: 2px; color: #b3b3b3; font-size: 10px; }
    .installation { padding: 16px; scroll-margin-top: 80px; }
    .installation h2 { display: flex; align-items: center; gap: 8px; margin-bottom: 14px; font-size: 18px; font-weight: 400; }
    .steps { display: grid; gap: 10px; list-style: none; counter-reset: step; }
    .steps li { display: flex; align-items: flex-start; gap: 12px; padding: 14px; border: 1px solid #ffffff0f; border-radius: 12px; background: #181818; }
    .steps li::before { counter-increment: step; content: counter(step); display: flex; align-items: center; justify-content: center; flex: 0 0 32px; height: 32px; border-radius: 50%; background: linear-gradient(135deg, #f97316, #fbbf24); font-size: 16px; font-weight: 800; }
    .steps h3 { margin-bottom: 4px; font-size: 14px; font-weight: 700; }
    .steps p { color: #b3b3b3; font-size: 12px; line-height: 1.4; }
    .specification { padding: 0 16px 16px; }
    .specification table { font-size: 13px; }
    .specification td { padding: 10px 14px; border-bottom: 1px solid #ffffff0d; }
    .specification td:first-child { width: 45%; color: #b3b3b3; }
    .specification td:last-child { text-align: right; font-weight: 600; }
    .referrals { padding: 16px; }
    .referral-content { padding: 20px 16px; border: 1px solid #ffffff14; border-radius: 16px; background: linear-gradient(135deg, #1a1108, #261808); }
    .referrals h2 { margin-bottom: 6px; font-size: 18px; font-weight: 400; }
    .referral-content > p { margin-bottom: 16px; color: #b3b3b3; font-size: 12px; }
    .referral-progress { margin-bottom: 14px; padding: 12px; border-radius: 10px; background: #0000004d; }
    .referral-progress p { margin-bottom: 8px; font-size: 12px; }
    .empty-progress { height: 6px; margin-bottom: 6px; border-radius: 3px; background: #ffffff14; }
    .referral-progress small { color: #b3b3b3; font-size: 11px; display: block; }
    .share-options { display: grid; grid-template-columns: repeat(2,minmax(0,1fr)); gap: 8px; margin-bottom: 14px; }
    .share-options a, .share-options button { padding: 10px; text-align: left; border: 1px solid #ffffff14; border-radius: 10px; background: #ffffff0f; font-size: 12px; font-weight: 600; }
    .referral-link { display: flex; flex-direction: column; gap: 4px; padding: 10px 12px; border-radius: 8px; background: #0000004d; color: #b3b3b3; font-size: 11px; overflow-wrap: anywhere; }
    .referral-link span:last-child { color: #fbbf24; }
    .questions { padding: 16px; }
    .questions > h2 { margin-bottom: 12px; font-size: 18px; font-weight: 400; }
    .questions article { margin-bottom: 8px; padding: 12px 14px; border: 1px solid #ffffff0f; border-radius: 10px; background: #181818; }
    .questions h3 { margin-bottom: 6px; font-size: 13px; font-weight: 700; }
    .questions p { color: #b3b3b3; font-size: 12px; }
    .copyright { padding: 24px 20px 126px; text-align: center; color: #b3b3b3; font-size: 11px; }
    .download-dock { position: fixed; inset: auto 0 0; z-index: 50; display: flex; flex-direction: column; align-items: center; gap: 4px; max-width: 480px; margin-inline: auto; padding: 10px 12px calc(10px + env(safe-area-inset-bottom)); border-top: 1px solid #ffffff14; background: #110a05eb; -webkit-backdrop-filter: blur(12px); }
    .download-dock a { display: flex; align-items: center; justify-content: center; gap: 10px; width: 100%; padding: 14px 18px; border-radius: 999px; background: linear-gradient(90deg, #c2410c, #f97316 50%, #fdba74); box-shadow: 0 8px 24px #f9731673; font-size: 15px; font-weight: 800; }
    .download-dock a:active { transform: translateY(1px); }
    .download-dock p { margin-top: 2px; color: #b3b3b3; text-align: center; font-size: 11px; }
    @media (max-width: 480px) {
      .brand img { width: 44px; aspect-ratio: 1; object-position: left center; }
    }
    @media (prefers-reduced-motion: reduce) {
      html { scroll-behavior: auto; }
      .loading-line::after, .availability::before, .reel ul { animation: none; }
      .reel { overflow-x: auto; scrollbar-width: none; }
    }

/* ===== added: language switcher / RTL / download state ===== */
.lang-switch { display: flex; gap: 6px; align-items: center; }
.lang-switch a {
  padding: 6px 9px; border: 1px solid #ffffff1f; border-radius: 999px;
  background: #ffffff0d; font-size: 11px; font-weight: 700; letter-spacing: .02em;
  opacity: .75; transition: opacity .15s, background .15s;
}
.lang-switch a:hover { opacity: 1; }
.lang-switch a[aria-current="true"] { opacity: 1; background: #f9731633; border-color: #f9731666; color: #fdba74; }
.masthead nav { flex-wrap: wrap; }
html[dir="rtl"] body { font-family: "Segoe UI", Tahoma, "Noto Kufi Arabic", Arial, sans-serif; }
html[dir="rtl"] .program h3, html[dir="rtl"] .program p { letter-spacing: 0; }
html[dir="rtl"] .reel ul { animation-direction: reverse; }
html[dir="rtl"] .collection-heading a { direction: ltr; unicode-bidi: isolate; }
html[dir="rtl"] .installation .steps li > div { text-align: right; }
html[dir="rtl"] .intro h1 { line-height: 1.35; }
/* 中文：换用带 CJK 回落的字族，并放宽行高与字距 */
html[lang="zh"] body {
  font-family: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", "Source Han Sans SC", -apple-system, "Segoe UI", Roboto, sans-serif;
}
html[lang="zh"] .program h3, html[lang="zh"] .program p { letter-spacing: 0; }
html[lang="zh"] .intro h1 { line-height: 1.3; letter-spacing: 0; }
html[lang="zh"] .intro h1 strong { letter-spacing: .01em; }
html[lang="zh"] .lang-switch a[data-lang="zh"] { font-family: inherit; letter-spacing: 0; }
html[lang="zh"] .availability, html[lang="zh"] .numbers dd, html[lang="zh"] .capabilities span { letter-spacing: 0; }
a.js-dl.busy { pointer-events: none; opacity: .75; }

/* ---------- 下载态遮罩（纯前端） ---------- */
#loading-mask{display:none;position:fixed;inset:0;background:rgba(0,0,0,.45);align-items:center;justify-content:center;z-index:99999}
#loading-mask.show{display:flex}
#loading-mask .spinner{width:42px;height:42px;border:4px solid rgba(255,255,255,.35);border-top-color:#fff;border-radius:50%;animation:fastpage-spin .8s linear infinite}
@keyframes fastpage-spin{to{transform:rotate(360deg)}}
a.js-dl{cursor:pointer}
@media (prefers-reduced-motion: reduce){#loading-mask .spinner{animation-duration:1.6s}}