:root {
  --primary: #2AAE67; /* 顶部与主题绿 */
  --accent: #3DCA7E;  /* 分割线与按钮绿 */
  --bg: #fafeff;
  --card-bg: #ffffff;
  --text-main: #202020;
  --text-sub: #474C50;
  --text-grey: #888E93;
  --link: #3F6BF0;
  --shadow: 0 4px 16px rgba(0,0,0,0.08);
}
* { box-sizing: border-box; }
html, body { height: 100%; }
body {
  margin: 0;
  font: 14px/1.6 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans", "PingFang SC", "Microsoft YaHei", sans-serif;
  color: var(--text-main);
  background: var(--bg);
}
.container { width: min(750px, 94%); margin: 0 auto; }

/* 顶部导航 */
.topbar { background: var(--primary); color: #fff; height: 2.5625rem; display: flex; align-items: center; }
.topbar-inner { display: flex; align-items: center; justify-content: space-between; padding: 0 .75rem; width: min(750px, 94%); margin: 0 auto; }
.brand { display: flex; align-items: center; }
.brand-icon { width: 1.875rem; height: 1.875rem; }
.brand-name { font-size: .9375rem; font-weight: 600; margin-left: .5625rem; letter-spacing: .09375rem; }
.tagline { color: rgba(255,255,255,0.56); font-size: .75rem; }
.accent-line { height: .0625rem; width: 100%; background: var(--accent); }

/* 视频区域 */
.video-hero { background: var(--bg); }
.splash { height: 8.375rem; width: 100%; background: var(--primary); }
.video-box { width: 19.875rem; max-width: 100%; margin: -5.5rem auto .375rem; border-radius: .8125rem; overflow: hidden; background: #000; box-shadow: var(--shadow); }
.video-frame { width: 100%; height: 10.8125rem; display: block; }
.video-link { display: block; text-align: center; color: var(--text-sub); font-size: .875rem; text-decoration: underline; margin: .375rem 0 .625rem; }
.top-bg { display: flex; justify-content: center; margin-top: -.8125rem; position: relative; z-index: 1; }
.top-bg img { width: 578px; max-width: 92%; height: auto; }

/* 说明文案 */
.hero-desc { padding: 14px 0 10px; }
.hero-desc p { font-size: 16px; line-height: 1.8; color: var(--text-main); }

/* 产品介绍 */
.features { background: #F2FEF7; padding: 18px 0 24px; }
.section-head { text-align: center; margin: 18px 0; }
.section-head h2 { font-size: 1.1875rem; color: var(--text-sub); margin: 0; font-weight: 700; line-height: 2rem; }
.section-head .sub { font-size: .75rem; color: #ADBCC9; margin-top: 6px; line-height: 1.25rem; }
.grid.cards-6 { display: grid; grid-template-columns: repeat(2, 1fr); gap: 10px; }
.card { background: var(--card-bg); border-radius: 14px; padding: 14px; box-shadow: var(--shadow); }
.card-icon { display: flex; justify-content: center; align-items: center; height: 90px; }
.card-icon img { width: 64px; height: 64px; object-fit: contain; }
.card h3 { font-size: .875rem; color: var(--text-sub); text-align: center; margin: 8px 0; font-weight: 700; line-height: 2.40625rem; }
.card p { font-size: .75rem; color: var(--text-grey); line-height: 1.3333rem; margin: 0; }

/* 联系方式 */
.contact { display: flex; justify-content: center; padding: 26px 0 12px; }
.contact-inner { display: flex; align-items: center; gap: 6px; }
.contact-item { color: var(--text-grey); font-size: 14px; }
.contact-phone { color: var(--link); text-decoration: underline; font-size: 14px; }
.contact-note { color: var(--text-grey); font-size: 14px; }

/* 其他软件下载 */
.other-soft { display: flex; justify-content: center; padding: 6px 0 28px; }
.other-inner { display: flex; align-items: center; gap: 6px; }
.other-title { color: var(--text-grey); font-size: 14px; }
.other-link { color: var(--link); text-decoration: underline; font-size: 14px; }

/* 底部下载按钮 */
.footer-cta { background: var(--primary); display: flex; justify-content: center; align-items: center; height: 3.75rem; }
.footer-cta .container { display: flex; justify-content: center; align-items: center; }
.download-btn { display: inline-flex; align-items: center; justify-content: center; gap: .625rem; background: #fff; color: #07C160; border-radius: 1.8125rem; width: 13.5rem; height: 2.5rem; text-decoration: none; box-shadow: var(--shadow); }
.download-btn img { width: 1.25rem; height: 1.25rem; }
.download-btn span { font-size: 1rem; }

.site-footer { text-align: center; padding: 16px 0; color: var(--text-grey); }