:root {
  color-scheme: light;
  --green: #174b36;
  --green-dark: #103a2b;
  --gold: #d4a348;
  --paper: #faf6e9;
  --ink: #264637;
  --muted: #647462;
  --serif: 'STKaiti', 'KaiTi', 'Songti SC', 'SimSun', serif;
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; scroll-padding-top: 96px; background: #143d2f; }
body { margin: 0; color: var(--ink); font: 14px/1.8 -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Microsoft YaHei', sans-serif; padding-bottom: calc(76px + env(safe-area-inset-bottom)); }
a { color: inherit; text-decoration: none; -webkit-tap-highlight-color: transparent; touch-action: manipulation; }
a:focus-visible { outline: 3px solid #b77920; outline-offset: 4px; }
img { max-width: 100%; }
::selection { background: #d5e6c7; color: #153f2d; }
.sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip-path: inset(50%); white-space: nowrap; border: 0; }
.skip-link { position: fixed; z-index: 100; left: 16px; top: 8px; padding: 10px 18px; background: var(--green); color: white; transform: translateY(-160%); }
.skip-link:focus { transform: none; }
.page { max-width: 750px; min-height: 100vh; margin: auto; background: var(--paper); box-shadow: 0 0 45px #0002; }
.site-header { position: fixed; z-index: 20; top: 0; left: 50%; transform: translateX(-50%); width: 100%; max-width: 750px; height: 84px; display: flex; align-items: center; justify-content: space-between; gap: 16px; padding: 10px 22px; background: linear-gradient(105deg, #addbc1f7, #d9edd5f7); border-bottom: 1px solid #709e7266; backdrop-filter: blur(10px); }
.identity { display: flex; align-items: center; gap: 13px; min-width: 0; }
.app-icon { width: 58px; height: 58px; flex: none; border-radius: 13px; }
.brand-copy { display: flex; flex-direction: column; align-items: flex-start; min-width: 0; }
.brand-title { display: block; color: #fff8d6; font: 700 36px/1.3 'FangSong', 'STFangsong', 'SimSun', serif; letter-spacing: 2px; white-space: nowrap; -webkit-text-stroke: 1.1px #263b2a; paint-order: stroke fill; text-shadow: 0 1px 0 #263b2a; }
.brand-copy > span { font-size: 10px; letter-spacing: .5px; color: #345b3d; white-space: nowrap; line-height: 1.3; }
.button { display: inline-flex; align-items: center; justify-content: center; gap: 14px; min-height: 46px; padding: 10px 20px; border: 1px solid transparent; border-radius: 6px; font-weight: 600; line-height: 1.5; white-space: nowrap; transition: background .18s, box-shadow .18s, transform .18s; }
.button:active { transform: translateY(1px); }
.button-gold { background: linear-gradient(#efd180, #dbae4d); border-color: #b4862f; color: #574019; box-shadow: inset 0 1px #fff9, 0 2px 4px #5f4d1915; }
.button-green { background: #1b6448; border-color: #154b36; color: #fff8e7; box-shadow: inset 0 1px #ffffff20; }
.header-download { flex: none; min-width: 106px; font-size: 16px; font-family: var(--serif); }
main { padding-top: 84px; }
.hero-poster { display: block; overflow: hidden; }
.hero-poster img { display: block; width: 101.834%; max-width: none; margin-left: -1.834%; height: auto; }
.introduction { padding: 26px 36px 30px; text-align: center; border-bottom: 1px solid #bda16b44; background: linear-gradient(#edf1da, #faf6e9 38%); }
.section-label { color: #647a58; font-size: 12px; letter-spacing: 3px; margin: 0 0 7px; }
.introduction h2 { font: 600 27px/1.5 var(--serif); margin: 0 0 14px; color: var(--green); }
.intro-text { max-width: 590px; margin: auto; font-size: 14px; line-height: 1.95; text-align: left; color: #425b45; }
.quick-features { display: grid; grid-template-columns: repeat(4, minmax(0, 1fr)); list-style: none; padding: 17px 0 0; margin: 18px 0 0; border-top: 1px solid #bda16b44; gap: 8px; font-size: 12px; color: var(--green); }
.quick-features li { padding: 2px 0; }
.quick-features li + li { border-left: 1px solid #bda16b44; }
.features-title { font: 600 25px/1.5 var(--serif); text-align: center; padding: 23px 20px; margin: 0; letter-spacing: 3px; color: var(--green); }
.feature { margin: 0; }
.feature > img { display: block; width: 100%; height: auto; }
.feature figcaption { padding: 17px 30px 22px; border-bottom: 1px solid #bda16b33; background: var(--paper); }
.feature h3 { font: 600 20px/1.5 var(--serif); color: var(--green); margin: 0 0 6px; }
.feature p { margin: 0; font-size: 13px; line-height: 1.9; color: #596a55; }
.final-download { padding: 34px 22px 28px; display: flex; flex-direction: column; align-items: center; background: linear-gradient(#faf6e9, #e4ead0); }
.final-download > img { width: 250px; height: auto; }
.final-download p { font-family: var(--serif); font-size: 16px; color: #4b6346; margin: 12px 0 18px; }
.final-download .button { min-width: 205px; font-size: 16px; min-height: 50px; }
.page-footer { padding: 14px 20px 20px; color: #6b7c63; background: #e4ead0; font-size: 11px; text-align: center; }
.download-dock { position: fixed; z-index: 25; bottom: 0; left: 50%; transform: translateX(-50%); display: grid; grid-template-columns: 44px minmax(0, 1fr) minmax(0, 1fr); gap: 12px; align-items: center; width: 100%; max-width: 750px; padding: 10px 20px calc(10px + env(safe-area-inset-bottom)); border-top: 1px solid #b3965c66; background: #faf6e9f7; box-shadow: 0 -5px 22px #153e221a; backdrop-filter: blur(10px); }
.download-dock > img { width: 44px; height: 44px; border-radius: 10px; }
.download-dock .button { font-size: 14px; padding: 10px; min-height: 46px; }
@media (hover: hover) {
  .button-gold:hover { background: linear-gradient(#f7df9a, #e6be63); box-shadow: inset 0 1px #fff9, 0 3px 9px #5f4d1925; }
  .button-green:hover { background: #247857; }
}
@media (max-width: 600px) {
  html { scroll-padding-top: 85px; }
  .site-header { height: 74px; padding: 9px 13px; gap: 10px; }
  .identity { gap: 9px; }
  .app-icon { width: 48px; height: 48px; border-radius: 11px; }
  .brand-title { font-size: 32px; line-height: 1.3; letter-spacing: 1px; -webkit-text-stroke-width: 1px; }
  .brand-copy > span { font-size: 8px; letter-spacing: .2px; }
  .header-download { min-width: 83px; padding: 10px 12px; font-size: 15px; }
  main { padding-top: 74px; }
  .introduction { padding: 22px 21px 24px; }
  .introduction h2 { font-size: 23px; margin-bottom: 12px; }
  .intro-text { font-size: 13px; line-height: 1.95; }
  .quick-features { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 9px 0; font-size: 12px; padding-top: 14px; margin-top: 16px; }
  .quick-features li:nth-child(3) { border-left: 0; }
  .features-title { font-size: 22px; padding: 20px; }
  .feature figcaption { padding: 15px 21px 19px; }
  .feature h3 { font-size: 19px; }
  .feature p { font-size: 12px; }
  .download-dock { grid-template-columns: 40px minmax(0, 1fr) minmax(0, 1fr); gap: 10px; padding-left: 13px; padding-right: 13px; }
  .download-dock > img { width: 40px; height: 40px; }
  .download-dock .button { font-size: 13px; padding: 10px 6px; gap: 8px; }
}
@media (max-width: 359px) {
  .site-header { padding-left: 10px; padding-right: 10px; gap: 7px; }
  .identity { gap: 7px; }
  .app-icon { width: 42px; height: 42px; }
  .brand-title { font-size: 28px; line-height: 1.4; }
  .brand-copy > span { font-size: 7px; letter-spacing: 0; }
  .header-download { min-width: 76px; padding: 10px 9px; font-size: 14px; }
  .introduction h2 { font-size: 21px; }
  .button { gap: 8px; }
}
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  * { transition: none !important; }
}