:root { color-scheme: light; --ink: #172b4d; --muted: #5d6e86; --blue: #2864df; --line: #dce5f1; --surface: #fff; font-family: -apple-system, BlinkMacSystemFont, "PingFang SC", "Microsoft YaHei", sans-serif; }
* { box-sizing: border-box; }
body { margin: 0; min-height: 100svh; color: var(--ink); background: radial-gradient(ellipse at 82% 22%, #e4edff 0, transparent 46%), radial-gradient(ellipse at 10% 76%, #eaf4ff 0, transparent 43%), #f5f7fb; font-size: 16px; line-height: 1.6; }
a { color: inherit; text-decoration: none; }
button { font: inherit; }
a, button { -webkit-tap-highlight-color: transparent; touch-action: manipulation; }
button, a[href] { cursor: pointer; }
[hidden] { display: none !important; }
:focus-visible { outline: 3px solid #386fd9; outline-offset: 4px; }
.page-header { width: min(1120px, calc(100% - 64px)); min-height: 100px; margin: auto; display: flex; align-items: center; justify-content: space-between; gap: 20px; }
.brand { display: inline-flex; align-items: center; gap: 10px; min-height: 44px; font-size: 23px; font-weight: 650; letter-spacing: .02em; }
.brand img { display: block; flex: none; background: var(--blue); padding: 6px; border-radius: 11px; box-shadow: 0 4px 10px #2864df17; }
.brand-divider { width: 1px; height: 17px; margin: 0 3px 0 10px; background: #c7d3e3; }
.brand small { color: var(--muted); font-size: 13px; font-weight: 400; letter-spacing: .05em; }
.home-link { display: inline-flex; align-items: center; gap: 12px; min-height: 44px; font-size: 14px; color: var(--muted); }
.home-link:hover, .page-help a:hover { color: var(--blue); }
.download-shell { width: min(940px, calc(100% - 48px)); margin: 32px auto 0; }
.page-title { text-align: center; margin-bottom: 34px; }
.eyebrow { color: #4d70a5; font-size: 12px; font-weight: 500; letter-spacing: .13em; margin: 0 0 10px; }
h1 { font-size: clamp(32px, 4vw, 44px); font-weight: 650; line-height: 1.25; letter-spacing: -.035em; margin: 0; }
.page-title > p:last-child { margin: 14px 0 0; color: var(--muted); font-size: 15px; }
.version-tabs { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); gap: 8px; margin-bottom: 18px; padding: 7px; border: 1px solid #e0e7f2; border-radius: 18px; background: #eaf0f9bb; }
.version-tabs button { display: flex; justify-content: center; align-items: center; gap: 13px; min-height: 76px; padding: 13px 10px; border: 1px solid transparent; border-radius: 12px; background: transparent; text-align: left; color: var(--muted); transition: background .18s, color .18s, box-shadow .18s; }
.version-tabs button:hover { background: #ffffff94; color: var(--ink); }
.version-tabs button[aria-selected="true"] { background: #fff; border-color: #dbe5f4; color: var(--blue); box-shadow: 0 3px 10px #183c6a0b; }
.version-tabs svg { flex: none; width: 27px; height: 27px; fill: currentColor; }
.version-tabs svg.line-icon { fill: none; stroke: currentColor; stroke-width: 1.6; stroke-linecap: round; stroke-linejoin: round; }
.version-tabs strong { display: block; font-size: 16px; font-weight: 600; line-height: 1.45; }
.version-tabs small { display: block; margin-top: 3px; font-size: 11px; color: var(--muted); }
.download-card { position: relative; border: 1px solid #e1e8f2; border-radius: 24px; background: var(--surface); overflow: hidden; box-shadow: 0 20px 60px #1c3f7510, 0 2px 8px #1c3f7504; }
.card-main { display: grid; grid-template-columns: minmax(0, 1.2fr) minmax(240px, 1fr); align-items: center; gap: 24px; padding: 42px 46px 28px; }
.audience { display: inline-flex; padding: 4px 10px; border-radius: 5px; background: #edf3ff; color: #2458b5; font-size: 12px; font-weight: 500; }
h2 { margin: 17px 0 16px; font-size: clamp(27px, 3vw, 34px); line-height: 1.3; letter-spacing: -.035em; font-weight: 650; }
.description { min-height: 54px; margin: 0; color: var(--muted); font-size: 15px; line-height: 1.85; white-space: pre-line; }
.requirements { display: flex; align-items: flex-start; gap: 8px; margin-top: 24px; color: #566985; font-size: 12px; }
.requirements-dot { width: 5px; height: 5px; margin-top: 7px; border-radius: 50%; background: #7898c3; flex: none; }
.product-art { position: relative; isolation: isolate; display: flex; flex-direction: column; justify-content: center; align-items: center; height: 234px; }
.art-orbit { position: absolute; z-index: -1; border: 1px solid #dae7fa; border-radius: 50%; }
.orbit-one { width: 236px; height: 236px; background: radial-gradient(circle, #eef5ff 0, #f7faff66 60%, transparent 72%); }
.orbit-two { width: 185px; height: 185px; border-style: dashed; }
.device-display { position: relative; width: 190px; height: 142px; margin-top: 8px; }
.device-screen { position: relative; display: grid; place-items: center; width: 100%; height: 118px; border: 5px solid #244d8e; border-radius: 10px; background: linear-gradient(135deg, #3d7bf0, #275bc9); box-shadow: 0 14px 24px #1f58ba24; }
.device-screen img { width: 58px; height: 58px; object-fit: contain; opacity: .96; }
.device-stand { position: absolute; width: 32px; height: 17px; background: #244d8e; bottom: 8px; left: calc(50% - 16px); }
.device-foot { position: absolute; width: 76px; height: 5px; background: #244d8e; border-radius: 4px; bottom: 4px; left: calc(50% - 38px); }
.art-caption { margin-top: 18px; color: #617da5; font-size: 11px; letter-spacing: .1em; }
[data-mode="android"] .device-display, [data-mode="sales"] .device-display { width: 94px; height: 164px; margin-top: 0; }
[data-mode="android"] .device-screen, [data-mode="sales"] .device-screen { height: 164px; border-radius: 18px; border-width: 5px; }
[data-mode="android"] .device-screen::before, [data-mode="sales"] .device-screen::before { position: absolute; content: ""; width: 28px; height: 4px; top: 5px; left: calc(50% - 14px); border-radius: 3px; background: #244d8e; }
[data-mode="android"] .device-screen img, [data-mode="sales"] .device-screen img { width: 46px; height: 46px; }
[data-mode="android"] .device-stand, [data-mode="android"] .device-foot, [data-mode="sales"] .device-stand, [data-mode="sales"] .device-foot { display: none; }
.download-action { display: grid; grid-template-columns: minmax(0, 1.2fr) minmax(240px, 1fr); align-items: center; gap: 24px; padding: 24px 46px 28px; border-top: 1px solid #eef2f7; background: #fcfdff; }
.download-button { display: flex; justify-content: center; align-items: center; gap: 12px; min-height: 54px; padding: 12px 16px; border-radius: 11px; background: var(--blue); color: #fff; font-size: 16px; font-weight: 600; text-align: center; box-shadow: 0 7px 16px #2864df1c; transition: background .18s, box-shadow .18s; }
.download-button:hover { background: #1c53c5; box-shadow: 0 8px 20px #2864df2a; }
.download-button[aria-disabled="true"] { cursor: default; background: #e4ebf6; color: #61738e; box-shadow: none; }
.download-button svg { width: 21px; height: 21px; flex: none; }
.release-info { min-height: 18px; margin: 10px 0 0; color: var(--muted); font-size: 11px; text-align: center; }
.install-note { max-width: 290px; margin: 0 auto; color: var(--muted); font-size: 12px; line-height: 1.9; white-space: pre-line; }
.notice { padding: 13px 22px; background: #fff8e9; border-top: 1px solid #f1e6cf; color: #785421; text-align: center; font-size: 13px; line-height: 1.8; }
.load-error { display: flex; flex-wrap: wrap; align-items: center; justify-content: center; gap: 8px 14px; padding: 12px 24px; border-top: 1px solid var(--line); background: #f5f8fd; color: var(--muted); font-size: 13px; }
.load-error p { margin: 0; }
.load-error button { min-height: 44px; padding: 6px 12px; border: 1px solid #c3d5f3; border-radius: 8px; color: #2458b5; background: #fff; }
.page-help { display: flex; flex-wrap: wrap; align-items: center; justify-content: center; gap: 10px; margin: 17px 0 0; color: #66758b; font-size: 12px; }
.page-help > svg { width: 17px; height: 17px; color: #7390b5; }
.page-help > i { width: 3px; height: 3px; margin: 0 3px; border-radius: 50%; background: #a1b1c8; }
.page-help a { display: inline-flex; align-items: center; min-height: 44px; margin-left: auto; color: #4d6484; }
.registration-success { margin-bottom: 22px; padding: 20px 24px; border: 1px solid #cbdcf7; border-radius: 16px; background: #f0f6ff; }
.registration-success h2 { margin: 0 0 8px; font-size: 20px; }
.registration-success p { margin: 6px 0 12px; color: var(--muted); font-size: 13px; line-height: 1.8; }
.registration-success button { min-height: 44px; padding: 8px 14px; border: 1px solid #adc7ee; border-radius: 8px; background: #fff; color: #2458b5; }
.registration-success [role="status"] { display: inline-block; margin: 6px 10px; color: var(--muted); font-size: 12px; }
.registration-success input { display: block; width: 100%; margin-top: 10px; padding: 10px; border: 1px solid var(--line); border-radius: 8px; color: var(--ink); background: #fff; font-size: 13px; }
footer { margin: 35px 20px 25px; text-align: center; color: #6c7b91; font-size: 11px; }
footer span { margin: 0 5px; }
.noscript-note { padding: 20px; color: var(--muted); text-align: center; }
.noscript-note a { text-decoration: underline; color: var(--blue); }
@media (max-width: 660px) {
  .page-header { width: calc(100% - 40px); min-height: 78px; gap: 14px; }
  .brand { font-size: 21px; gap: 8px; }.brand img { width: 34px; height: 34px; padding: 5px; border-radius: 9px; }
  .brand-divider, .brand small { display: none; }.home-link { font-size: 12px; gap: 8px; }
  .download-shell { width: calc(100% - 32px); margin-top: 18px; }
  .page-title { margin-bottom: 24px; }.eyebrow { font-size: 11px; letter-spacing: .08em; margin-bottom: 8px; }
  h1 { font-size: 32px; }.page-title > p:last-child { font-size: 14px; margin-top: 10px; }
  .version-tabs { grid-template-columns: repeat(2, minmax(0, 1fr)); padding: 5px; gap: 5px; border-radius: 16px; margin-bottom: 14px; }
  .version-tabs button { min-height: 66px; padding: 10px; gap: 10px; justify-content: flex-start; }.version-tabs svg { width: 23px; height: 23px; }.version-tabs strong { font-size: 14px; }.version-tabs small { font-size: 10px; margin-top: 1px; }
  .download-card { border-radius: 19px; }.card-main { display: block; padding: 25px 24px 24px; }.product-art { display: none; }
  .audience { font-size: 11px; }h2 { font-size: 28px; margin: 13px 0; }.description { min-height: 54px; font-size: 14px; line-height: 1.9; }
  .requirements { margin-top: 18px; font-size: 11px; }
  .download-action { grid-template-columns: minmax(0, 1fr); gap: 14px; padding: 20px 24px; }.download-button { min-height: 52px; font-size: 15px; }
  .install-note { max-width: none; font-size: 11px; line-height: 1.8; text-align: center; }.install-note br { display: none; }.notice { padding: 12px 20px; font-size: 12px; }
  .page-help { font-size: 11px; gap: 7px; margin-top: 16px; }.page-help a { flex-basis: 100%; margin: 0; justify-content: center; }.page-help > svg { width: 15px; height: 15px; }
  footer { max-width: 300px; margin: 20px auto 24px; padding: 0 15px; font-size: 10px; line-height: 1.8; }
}
@media (prefers-reduced-motion: reduce) { *, *::before, *::after { transition: none !important; scroll-behavior: auto !important; } }