:root {
  --ink: #101a31;
  --muted: #6c788e;
  --line: #e7eaf2;
  --blue: #246cf2;
  --purple: #7253e7;
  --surface: #f6f8fc;
}

* { box-sizing: border-box; }
html { width: 100%; max-width: 100%; overflow-x: hidden; }
body { width: 100%; max-width: 100%; margin: 0; color: var(--ink); background: var(--surface); font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC", "Microsoft YaHei", sans-serif; -webkit-font-smoothing: antialiased; overflow-x: hidden; }
a { color: inherit; text-decoration: none; }
img { display: block; max-width: 100%; }
button { font: inherit; }

.download-header { height: 82px; position: relative; z-index: 20; border-bottom: 1px solid rgba(220,225,236,.85); background: rgba(255,255,255,.76); backdrop-filter: blur(18px); }
.download-nav { width: min(1180px, calc(100% - 48px)); height: 100%; margin: auto; display: flex; align-items: center; justify-content: space-between; }
.download-brand { display: flex; align-items: center; gap: 12px; }
.download-brand img { width: 44px; height: 44px; border-radius: 12px; box-shadow: 0 8px 22px rgba(83,51,204,.2); }
.download-brand div { display: flex; flex-direction: column; gap: 4px; }
.download-brand strong { font-size: 20px; letter-spacing: .08em; }
.download-brand div span { color: #8b95a7; font-size: 10px; letter-spacing: .03em; }
.back-link { display: flex; align-items: center; gap: 9px; padding: 10px 16px; color: #536078; border: 1px solid var(--line); border-radius: 999px; background: rgba(255,255,255,.75); font-size: 13px; font-weight: 650; transition: .2s ease; }
.back-link:hover { color: var(--blue); border-color: #cddcff; transform: translateX(-2px); }

main { width: min(1180px, calc(100% - 48px)); min-width: 0; margin: auto; }
.download-hero { min-width: 0; min-height: 760px; padding: 96px 0 90px; position: relative; display: grid; grid-template-columns: .92fr 1.08fr; gap: 72px; align-items: center; }
.download-hero::before { content: ""; position: absolute; z-index: -2; width: 760px; height: 760px; left: -430px; top: -170px; border-radius: 50%; background: radial-gradient(circle, rgba(83,114,255,.13), transparent 68%); }
.download-hero::after { content: ""; position: absolute; z-index: -2; width: 580px; height: 580px; right: -350px; bottom: -40px; border-radius: 50%; background: radial-gradient(circle, rgba(221,62,182,.09), transparent 68%); }
.hero-aura { position: absolute; z-index: -1; border-radius: 50%; filter: blur(2px); }
.aura-one { width: 15px; height: 15px; left: 46%; top: 13%; background: #785bed; box-shadow: 0 0 0 8px rgba(120,91,237,.08); }
.aura-two { width: 10px; height: 10px; left: 4%; bottom: 16%; background: #ff9c4f; box-shadow: 0 0 0 7px rgba(255,156,79,.08); }

.hero-content, .hero-copy, .platform-panel { min-width: 0; }
.hero-content { display: flex; flex-direction: column; align-items: flex-start; }
.app-logo-wrap { width: 174px; height: 174px; margin-bottom: 42px; position: relative; }
.app-logo-wrap img { width: 152px; height: 152px; position: absolute; left: 11px; top: 11px; border: 1px solid rgba(255,255,255,.6); border-radius: 38px; box-shadow: 0 30px 70px rgba(76,49,187,.26); }
.logo-orbit { position: absolute; inset: -18px; border: 1px solid rgba(69,105,231,.14); border-radius: 50%; box-shadow: 0 0 0 20px rgba(75,110,233,.025), 0 0 0 40px rgba(75,110,233,.018); }
.logo-star { position: absolute; right: -20px; top: 0; display: grid; place-items: center; width: 40px; height: 40px; color: #fff; background: linear-gradient(145deg, #7b5cf0, #4d6bec); border: 5px solid var(--surface); border-radius: 50%; box-shadow: 0 12px 25px rgba(87,80,217,.24); }
.hero-kicker { display: flex; align-items: center; gap: 9px; margin-bottom: 20px; color: var(--blue); font-size: 11px; font-weight: 800; letter-spacing: .18em; }
.hero-kicker i { width: 22px; height: 2px; background: var(--blue); }
.hero-copy h1 { margin: 0; font-size: clamp(48px, 4.6vw, 67px); line-height: 1.14; letter-spacing: -.055em; }
.hero-copy h1 em { color: transparent; background: linear-gradient(90deg, #246cf2, #7655e9 60%, #d947b2); background-clip: text; -webkit-background-clip: text; font-style: normal; }
.hero-copy p { max-width: 500px; margin: 27px 0 28px; color: var(--muted); font-size: 16px; line-height: 1.9; }
.platform-line { display: flex; align-items: center; gap: 13px; color: #929bac; font-size: 11px; }

.platform-panel { display: grid; grid-template-columns: 1fr 1fr; gap: 16px; }
.platform-card { min-height: 530px; padding: 32px 27px 28px; position: relative; overflow: hidden; background: rgba(255,255,255,.88); border: 1px solid rgba(224,228,238,.95); border-radius: 30px; box-shadow: 0 22px 65px rgba(35,54,98,.09); transition: transform .25s ease, box-shadow .25s ease, border-color .25s ease; }
.platform-card::after { content: ""; position: absolute; width: 210px; height: 210px; right: -95px; top: -105px; border-radius: 50%; background: linear-gradient(145deg, rgba(54,133,255,.09), transparent); box-shadow: 0 0 0 35px rgba(62,121,239,.025); }
.ios-card::after { background: linear-gradient(145deg, rgba(126,77,226,.11), transparent); }
.platform-card:hover, .platform-card.recommended { transform: translateY(-7px); border-color: #d4def7; box-shadow: 0 30px 75px rgba(35,68,135,.14); }
.platform-card.recommended::before { content: "适合当前设备"; position: absolute; z-index: 3; right: 19px; bottom: 17px; padding: 5px 8px; color: #fff; background: var(--blue); border-radius: 999px; font-size: 9px; font-weight: 750; }
.platform-card-top { display: flex; align-items: flex-start; justify-content: space-between; position: relative; z-index: 2; }
.platform-icon { width: 70px; height: 70px; display: grid; place-items: center; border-radius: 21px; }
.android-icon { position: relative; background: linear-gradient(145deg, #effaf6, #ddf5eb); }
.android-head { width: 37px; height: 26px; position: relative; top: 6px; background: #2dbd82; border-radius: 19px 19px 7px 7px; }
.android-head::before, .android-head::after { content: ""; position: absolute; top: -7px; width: 2px; height: 12px; background: #2dbd82; border-radius: 2px; }
.android-head::before { left: 9px; transform: rotate(-28deg); }.android-head::after { right: 9px; transform: rotate(28deg); }
.android-head i { position: absolute; top: 10px; width: 3px; height: 3px; background: #fff; border-radius: 50%; }
.android-head i:first-child { left: 10px; }.android-head i:last-child { right: 10px; }
.apple-icon { background: #000; box-shadow: inset 0 0 0 1px rgba(255,255,255,.1); }
.apple-icon img { width: 100%; height: 100%; border-radius: inherit; }
.platform-badge { padding: 6px 9px; color: #8994a7; background: #f3f5f9; border-radius: 7px; font-size: 9px; font-weight: 800; letter-spacing: .12em; }
.platform-card h2 { margin: 34px 0 13px; font-size: 28px; letter-spacing: -.03em; }
.platform-card > p { min-height: 76px; margin: 0; color: #768196; font-size: 13px; line-height: 1.85; }
.platform-card dl { margin: 25px 0 28px; padding: 17px 0; border-block: 1px solid #edf0f5; }
.platform-card dl div { display: flex; justify-content: space-between; padding: 7px 0; font-size: 11px; }
.platform-card dt { color: #a0a8b7; }.platform-card dd { margin: 0; color: #4c5870; font-weight: 650; }
.download-button { width: 100%; min-height: 66px; padding: 0 17px; display: flex; align-items: center; gap: 13px; color: #fff; background: linear-gradient(135deg, #2879ff, #205cdd); border: 0; border-radius: 16px; text-align: left; box-shadow: 0 14px 30px rgba(34,101,229,.23); transition: transform .2s ease, box-shadow .2s ease; }
.ios-card .download-button { background: linear-gradient(135deg, #242c3a, #0d121d); box-shadow: 0 14px 30px rgba(16,22,34,.2); }
.download-button:hover { transform: translateY(-3px); box-shadow: 0 18px 36px rgba(34,101,229,.3); }
.ios-card .download-button:hover { box-shadow: 0 18px 36px rgba(16,22,34,.28); }
.button-icon { width: 36px; height: 36px; display: grid; place-items: center; color: #fff; background: rgba(255,255,255,.16); border-radius: 11px; font-size: 19px; }
.download-button > span:last-child { display: flex; flex-direction: column; gap: 3px; }
.download-button b { color: #fff; font-size: 13px; }.download-button small { color: rgba(255,255,255,.68); font-size: 9px; }
.apple-small { overflow: hidden; background: #000; }
.apple-small img { width: 100%; height: 100%; border-radius: inherit; }

.download-features { padding: 90px 0 100px; border-top: 1px solid var(--line); }
.features-heading { display: flex; justify-content: space-between; align-items: end; margin-bottom: 44px; }
.features-heading > span { color: var(--blue); font-size: 11px; font-weight: 800; letter-spacing: .12em; }
.features-heading h2 { max-width: 540px; margin: 0; text-align: right; font-size: clamp(30px, 3vw, 44px); letter-spacing: -.04em; }
.feature-row { display: grid; grid-template-columns: repeat(3, 1fr); gap: 14px; }
.feature-item { min-height: 140px; padding: 27px; display: flex; align-items: center; gap: 20px; background: #fff; border: 1px solid var(--line); border-radius: 23px; }
.feature-symbol { flex: 0 0 auto; width: 52px; height: 52px; display: flex; align-items: center; justify-content: center; color: #fff; background: linear-gradient(145deg, #3986ff, #2258de); border-radius: 16px; box-shadow: 0 10px 24px rgba(42,104,234,.22); }
.symbol-growth { align-items: flex-end; gap: 3px; padding-bottom: 13px; }
.symbol-growth i { width: 4px; background: #fff; border-radius: 4px; }.symbol-growth i:nth-child(1) { height: 11px; }.symbol-growth i:nth-child(2) { height: 22px; }.symbol-growth i:nth-child(3) { height: 16px; }
.symbol-ai { background: linear-gradient(145deg, #9268ee, #6846d8); font-size: 23px; }.symbol-learn { background: linear-gradient(145deg, #ff9b56, #e87738); font-size: 17px; }
.feature-item h3 { margin: 0 0 8px; font-size: 17px; }.feature-item p { margin: 0; color: #8791a3; font-size: 12px; line-height: 1.65; }

.coming-soon { min-height: 230px; padding: 48px 55px; position: relative; overflow: hidden; display: grid; grid-template-columns: auto 1fr auto; align-items: center; gap: 30px; color: #fff; background: radial-gradient(circle at 80% 5%, #7357da, transparent 35%), linear-gradient(135deg, #172742, #1b3563); border-radius: 30px; box-shadow: 0 25px 65px rgba(23,42,81,.15); }
.coming-soon::after { content: ""; position: absolute; width: 240px; height: 240px; right: -80px; bottom: -170px; border: 1px solid rgba(255,255,255,.13); border-radius: 50%; box-shadow: 0 0 0 35px rgba(255,255,255,.025), 0 0 0 70px rgba(255,255,255,.018); }
.coming-mark { display: grid; place-items: center; width: 66px; height: 66px; color: #fff; background: linear-gradient(145deg, #3d8dff, #765ce5); border-radius: 20px; font-size: 28px; box-shadow: 0 15px 35px rgba(31,76,183,.3); }
.coming-label { color: #75a8ff; font-size: 9px; font-weight: 800; letter-spacing: .18em; }
.coming-soon h2 { margin: 9px 0; font-size: 28px; }.coming-soon p { margin: 0; color: #aebbd0; font-size: 13px; }
.coming-soon > a { position: relative; z-index: 2; display: inline-flex; align-items: center; gap: 12px; padding: 15px 20px; color: #244d9c; background: #fff; border-radius: 13px; font-size: 12px; font-weight: 750; transition: .2s ease; }
.coming-soon > a:hover { transform: translateY(-3px); }

.download-footer { width: min(1180px, calc(100% - 48px)); min-height: 140px; margin: 70px auto 0; padding: 28px 0 35px; display: flex; flex-direction: column; justify-content: center; gap: 24px; color: #9da5b4; border-top: 1px solid var(--line); font-size: 10px; }
.download-legal-links, .download-record { display: flex; align-items: center; justify-content: space-between; }
.download-legal-links { justify-content: flex-start; flex-wrap: wrap; gap: 23px; color: #68758a; font-size: 11px; }
.download-footer a { transition: color .2s ease; }
.download-footer a:hover { color: var(--blue); }

body.device-ios .android-card,
body.device-android .ios-card { display: none; }
body.device-ios .platform-panel,
body.device-android .platform-panel { grid-template-columns: minmax(280px, 360px); justify-content: center; }

@media (max-width: 960px) {
  .download-hero { grid-template-columns: 1fr; gap: 65px; padding-top: 75px; }
  .hero-content { align-items: center; text-align: center; }
  .hero-kicker { justify-content: center; }.hero-copy p { margin-inline: auto; }.platform-line { justify-content: center; }
  .platform-panel { width: min(690px, 100%); margin: auto; }
  body.device-ios .platform-panel, body.device-android .platform-panel { width: min(360px, 100%); }
  .features-heading { display: block; }.features-heading h2 { margin-top: 12px; text-align: left; }
  .feature-row { grid-template-columns: 1fr; }.feature-item { min-height: 110px; }
}

@media (max-width: 680px) {
  .download-header { height: 70px; }.download-nav, main, .download-footer { width: calc(100% - 28px); }
  .download-brand img { width: 38px; height: 38px; border-radius: 10px; }.download-brand strong { font-size: 17px; }.download-brand div span { display: none; }
  .back-link { padding: 9px 12px; font-size: 11px; }
  .download-hero { padding: 68px 0 70px; gap: 58px; }
  .app-logo-wrap { width: 140px; height: 140px; margin-bottom: 38px; }.app-logo-wrap img { width: 124px; height: 124px; left: 8px; top: 8px; border-radius: 31px; }.logo-star { right: -16px; width: 36px; height: 36px; }
  .hero-copy h1 { font-size: 42px; }.hero-copy p { font-size: 14px; }.platform-line { font-size: 9px; }
  .platform-panel { grid-template-columns: 1fr; gap: 13px; }
  .platform-card { min-height: auto; padding: 27px 24px 24px; border-radius: 24px; }
  .platform-icon { width: 60px; height: 60px; border-radius: 18px; }.platform-card h2 { margin-top: 25px; font-size: 25px; }.platform-card > p { min-height: 0; }.platform-card dl { margin: 21px 0; }
  .download-features { padding: 70px 0; }.features-heading h2 { font-size: 30px; }.feature-item { padding: 22px; }
  .coming-soon { padding: 38px 25px; grid-template-columns: 1fr; gap: 22px; border-radius: 25px; }.coming-mark { width: 55px; height: 55px; }.coming-soon h2 { font-size: 25px; }.coming-soon p { line-height: 1.7; }.coming-soon > a { width: 100%; justify-content: center; }
  .download-footer { min-height: 130px; margin-top: 50px; align-items: stretch; gap: 21px; }
  .download-record { align-items: flex-start; flex-direction: column; gap: 8px; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { transition-duration: .01ms !important; }
}

@supports (overflow: clip) {
  html, body { overflow-x: clip; }
}