:root {
  --c-indigo: #6366f1;
  --c-violet: #8b5cf6;
  --c-purple: #7c3aed;
  --c-soft:   #667eea;
  --c-soft2:  #764ba2;
  --grad-main: linear-gradient(135deg, #6366f1 0%, #8b5cf6 45%, #7c3aed 100%);
  --grad-soft: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  --purple: #7c3aed;   /* 主题深紫：按钮文字、激活态等 */
  --violet: #8b5cf6;   /* 主题亮紫：描边、悬停边框等 */
  --grad-text: linear-gradient(135deg, #8b5cf6 0%, #6366f1 100%);
  --ink: #1e1b33;
  --ink-2: #4b4763;
  --ink-3: #8b87a3;
  --bg: #ffffff;
  --bg-soft: #f7f6fc;
  --bg-soft2: #f1eefb;
  --line: #ece9f5;
  --radius: 18px;
  --shadow-sm: 0 4px 16px rgba(99,102,241,0.08);
  --shadow-md: 0 18px 50px rgba(99,102,241,0.14);
  --maxw: 1180px;
  --nav-h: 70px;
}

* { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  font-family: "PingFang SC", "Microsoft YaHei", "Segoe UI", system-ui, -apple-system, sans-serif;
  color: var(--ink);
  background: var(--bg);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}
a { color: inherit; text-decoration: none; }
img { max-width: 100%; display: block; }
.wrap { max-width: var(--maxw); margin: 0 auto; padding: 0 24px; }
.grad-text {
  background: var(--grad-text);
  -webkit-background-clip: text; background-clip: text;
  -webkit-text-fill-color: transparent; color: transparent;
}
.btn {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 13px 26px; border-radius: 999px; font-weight: 600;
  font-size: 15px; cursor: pointer; border: none; transition: all .25s ease;
  white-space: nowrap;
}
.btn-primary { background: var(--grad-main); color: #fff; box-shadow: 0 10px 26px rgba(124,58,237,.32); }
  .btn-primary:hover { transform: translateY(-2px); box-shadow: 0 16px 34px rgba(124,58,237,.42); }
  .btn-ghost { background: #fff; color: var(--purple); border: 1.5px solid var(--line); }
  .btn-ghost:hover { border-color: var(--violet); background: var(--bg-soft2); }
  .btn .ico { position: relative; top: -1px; }
  /* 防止 flex 容器把内联 SVG 图标压缩为 0 宽度导致“图标不显示” */
  .btn svg, .btn-dl svg, .ct-card .ic svg, .dl-hero .ph svg, .ver-item svg, .more-link svg { flex-shrink: 0; }

/* ---------- NAV ---------- */
header.nav {
  position: sticky; top: 0; z-index: 50; height: var(--nav-h);
  background: rgba(255,255,255,.82); backdrop-filter: saturate(180%) blur(14px);
  border-bottom: 1px solid transparent; transition: all .3s ease;
}
header.nav.scrolled { border-bottom-color: var(--line); box-shadow: var(--shadow-sm); }
.nav-inner { display: flex; align-items: center; justify-content: space-between; height: 100%; }
.logo { display: flex; align-items: center; gap: 10px; font-weight: 800; font-size: 19px; letter-spacing: .3px; }
.logo .mark {
  width: 34px; height: 34px; border-radius: 10px; background: var(--grad-main);
  display: grid; place-items: center; color: #fff; font-size: 18px; box-shadow: 0 6px 16px rgba(124,58,237,.35);
}
.logo-img { width: 34px; height: 34px; border-radius: 10px; object-fit: cover; box-shadow: 0 6px 16px rgba(124,58,237,.35); }
footer.site .f-logo-img { width: 32px; height: 32px; border-radius: 9px; object-fit: cover; vertical-align: middle; }
.nav-links { display: flex; align-items: center; gap: 6px; }
.nav-links a {
  padding: 9px 16px; border-radius: 999px; font-size: 15px; color: var(--ink-2);
  font-weight: 500; transition: all .2s ease;
}
.nav-links a:hover { color: var(--purple); background: var(--bg-soft2); }
.nav-links a.active { color: var(--purple); background: var(--bg-soft2); }
.nav-cta { display: flex; align-items: center; gap: 12px; }
.nav-toggle { display: none; background: none; border: none; font-size: 26px; cursor: pointer; color: var(--ink); }

/* ---------- HERO ---------- */
.hero { position: relative; overflow: hidden; padding: 96px 0 110px; }
.hero::before {
  content: ""; position: absolute; inset: -40% -10% auto -10%; height: 720px; z-index: -2;
  background: radial-gradient(60% 60% at 50% 0%, #efe9ff 0%, #f7f6fc 60%, #ffffff 100%);
}
.hero .blob { position: absolute; border-radius: 50%; filter: blur(60px); opacity: .5; z-index: -1; }
.hero .b1 { width: 380px; height: 380px; background: #c4b5fd; top: -60px; left: -80px; }
.hero .b2 { width: 320px; height: 320px; background: #a5b4fc; top: 80px; right: -60px; }
.hero-grid { display: grid; grid-template-columns: 1.05fr .95fr; gap: 56px; align-items: center; }
.hero .tag {
  display: inline-flex; align-items: center; gap: 7px; padding: 6px 14px;
  border-radius: 999px; background: #fff; border: 1px solid var(--line);
  font-size: 13px; color: var(--purple); font-weight: 600; box-shadow: var(--shadow-sm);
}
.hero .tag .dot { width: 7px; height: 7px; border-radius: 50%; background: var(--grad-main); }
.hero h1 { font-size: 52px; line-height: 1.12; font-weight: 800; margin: 20px 0 18px; letter-spacing: -.5px; }
.hero p.sub { font-size: 18px; color: var(--ink-2); max-width: 520px; }
.hero .actions { display: flex; gap: 14px; margin-top: 32px; flex-wrap: wrap; }
.hero .stats { display: flex; gap: 38px; margin-top: 44px; }
.hero .stats .n { font-size: 30px; font-weight: 800; }
.hero .stats .l { font-size: 14px; color: var(--ink-3); }

.hero-card {
  background: #fff; border-radius: 24px; padding: 26px; box-shadow: var(--shadow-md);
  border: 1px solid var(--line); position: relative;
}
.hero-card .screen {
  border-radius: 16px; background: var(--grad-main); padding: 22px; color: #fff;
  box-shadow: 0 20px 40px rgba(124,58,237,.3);
}
.hero-card .screen h3 { font-size: 17px; margin-bottom: 14px; font-weight: 700; }
.scr-row { display: flex; align-items: center; gap: 12px; padding: 11px 0; border-top: 1px solid rgba(255,255,255,.18); }
.scr-row:first-of-type { border-top: none; }
.scr-av { width: 38px; height: 38px; border-radius: 10px; background: rgba(255,255,255,.22); flex: none; display:grid; place-items:center; }
.scr-bar { height: 8px; border-radius: 99px; background: rgba(255,255,255,.28); flex: 1; }
.scr-bar.s60 { width: 60%; } .scr-bar.s80 { width: 80%; } .scr-bar.s45 { width: 45%; }
.hero-card .meta { display:flex; justify-content: space-between; margin-top: 18px; color: var(--ink-3); font-size: 13px; }

/* ---------- SECTION ---------- */
section.block { padding: 92px 0; }
section.block.alt { background: var(--bg-soft); }
.sec-head { text-align: center; max-width: 720px; margin: 0 auto 56px; }
.sec-head .ey { font-size: 14px; font-weight: 700; letter-spacing: 2px; text-transform: uppercase; }
.sec-head h2 { font-size: 38px; font-weight: 800; margin: 12px 0 14px; letter-spacing: -.5px; }
.sec-head p { font-size: 17px; color: var(--ink-2); }

/* features */
.feat-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 26px; }
.feat {
  background: #fff; border: 1px solid var(--line); border-radius: var(--radius);
  padding: 30px; transition: all .3s ease; position: relative; overflow: hidden;
}
.feat::after {
  content:""; position:absolute; left:0; top:0; height:3px; width:100%;
  background: var(--grad-main); transform: scaleX(0); transform-origin:left; transition: transform .35s ease;
}
.feat:hover { transform: translateY(-6px); box-shadow: var(--shadow-md); border-color: transparent; }
.feat:hover::after { transform: scaleX(1); }
.feat .ic {
  width: 52px; height: 52px; border-radius: 14px; background: var(--bg-soft2);
  display: grid; place-items: center; font-size: 24px; margin-bottom: 18px;
}
.feat h3 { font-size: 19px; margin-bottom: 10px; font-weight: 700; }
.feat p { color: var(--ink-2); font-size: 15px; }

/* platforms */
.plat-grid { display: grid; grid-template-columns: repeat(3, 1fr); gap: 22px; }
.plat {
  border: 1px solid var(--line); border-radius: var(--radius); padding: 30px 26px;
  background: #fff; display: flex; gap: 16px; align-items: flex-start; transition: all .25s ease;
}
.plat:hover { box-shadow: var(--shadow-md); transform: translateY(-4px); border-color: transparent; }
.plat .pic { width: 50px; height: 50px; border-radius: 13px; background: var(--grad-soft); flex: none; display:grid; place-items:center; color:#fff; font-size:22px; }
.plat h4 { font-size: 17px; margin-bottom: 6px; }
.plat p { font-size: 14px; color: var(--ink-2); }

/* about */
.about-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 54px; align-items: center; }
.about-grid .art {
  aspect-ratio: 4/3; border-radius: 22px; background: var(--grad-main); position: relative; overflow: hidden;
  box-shadow: var(--shadow-md);
}
.about-grid .art .art-img { position: absolute; inset: 0; width: 100%; height: 100%; object-fit: cover; }
.about-grid .art::before { content:""; position:absolute; inset:0; background: radial-gradient(50% 50% at 30% 20%, rgba(255,255,255,.35), transparent); }
.about-grid .art.art-gif::after { content:""; position:absolute; inset:0; background: linear-gradient(180deg, rgba(20,12,46,.05) 0%, rgba(20,12,46,.55) 100%); }
.about-grid .art .q { position: absolute; left: 30px; bottom: 28px; right: 30px; color: #fff; z-index: 1; text-shadow: 0 2px 12px rgba(0,0,0,.35); }
.about-grid .art .q h3 { font-size: 24px; font-weight: 800; line-height: 1.25; }
.about-grid .art .q p { opacity: .85; margin-top: 8px; font-size: 14px; }
.about-text h2 { font-size: 36px; font-weight: 800; margin-bottom: 18px; }
.about-text p { color: var(--ink-2); font-size: 16px; margin-bottom: 16px; }
.about-list { list-style: none; margin-top: 22px; display: grid; gap: 14px; }
.about-list li { display: flex; gap: 12px; align-items: flex-start; font-size: 15px; color: var(--ink-2); }
.about-list .ck { width: 22px; height: 22px; border-radius: 50%; background: var(--grad-main); color:#fff; flex:none; display:grid; place-items:center; font-size:13px; margin-top:2px; }

/* ---------- DOWNLOAD ---------- */
.dl-layout { display: grid; grid-template-columns: 380px 1fr; gap: 40px; align-items: start; }
.dl-hero {
  background: var(--grad-main); border-radius: 22px; padding: 34px 30px; color: #fff;
  text-align: center; box-shadow: var(--shadow-md); position: sticky; top: calc(var(--nav-h) + 20px);
}
.dl-hero .ph { width: 78px; height: 78px; border-radius: 20px; background: rgba(255,255,255,.22); margin: 0 auto 18px; display:grid; place-items: center; font-size:38px; }
/* .ph 内是浅色圆角块，SVG 用 currentColor(白) 会被浅底“吃掉”，改为品牌亮紫使其清晰可见 */
.dl-hero .ph svg { stroke: var(--violet); }
.dl-hero h3 { font-size: 22px; font-weight: 800; }
.dl-hero .ver { font-size: 14px; opacity: .85; margin: 6px 0 22px; }
.dl-hero .btn-dl {
  display: inline-flex; align-items: center; justify-content: center; gap: 10px; width: 100%;
  background: #fff; color: var(--purple); padding: 15px; border-radius: 14px; font-weight: 700; font-size: 16px;
  transition: all .25s ease;
}
.dl-hero .btn-dl:hover { transform: translateY(-2px); box-shadow: 0 14px 30px rgba(0,0,0,.18); }
.dl-hero .sys { font-size: 13px; opacity: .8; margin-top: 14px; }

.dl-main h3.title { font-size: 22px; font-weight: 800; margin-bottom: 6px; }
.dl-main p.desc { color: var(--ink-2); margin-bottom: 24px; }
.ver-tabs { display: flex; gap: 10px; margin-bottom: 22px; flex-wrap: wrap; }
.ver-tab {
  padding: 9px 18px; border-radius: 999px; border: 1.5px solid var(--line); background:#fff;
  font-size: 14px; font-weight: 600; color: var(--ink-2); cursor: pointer; transition: all .2s ease;
}
.ver-tab.active { background: var(--grad-main); color: #fff; border-color: transparent; }
.ver-list { display: grid; gap: 14px; }
.ver-item {
  border: 1px solid var(--line); border-radius: 16px; padding: 18px 22px; display: flex;
  align-items: center; justify-content: space-between; gap: 16px; transition: all .2s ease;
}
.ver-item:hover { border-color: var(--violet); background: var(--bg-soft2); }
.ver-item .v-left .v-num { font-size: 17px; font-weight: 700; display: flex; align-items: center; gap: 10px; }
.ver-item .badge { font-size: 11px; font-weight: 700; padding: 2px 9px; border-radius: 99px; background: var(--grad-soft); color:#fff; }
.ver-item .v-meta { font-size: 13px; color: var(--ink-3); margin-top: 4px; }
.ver-item .v-right { display: flex; gap: 10px; align-items: center; flex: none; }
.ver-item .dl-btn {
  padding: 9px 18px; border-radius: 10px; background: var(--grad-main); color:#fff; font-weight: 600; font-size: 14px;
  cursor: pointer; border: none; transition: all .2s ease; white-space: nowrap;
}
.ver-item .dl-btn:hover { transform: translateY(-1px); box-shadow: 0 8px 18px rgba(124,58,237,.32); }
.ver-item .note-btn { background: none; border: none; color: var(--ink-3); cursor: pointer; font-size: 13px; text-decoration: underline; }
.ver-note { font-size: 13px; color: var(--ink-2); padding: 10px 14px; background: var(--bg-soft); border-radius: 10px; margin-top: 4px; display: none; }
.ver-note.open { display: block; }
.more-versions { margin-top: 22px; text-align: center; }
.more-link {
  display: inline-flex; align-items: center; gap: 6px; padding: 11px 22px; border-radius: 999px;
  background: #fff; border: 1.5px solid var(--line); color: var(--purple); font-weight: 600; font-size: 14px;
  transition: all .2s ease;
}
.more-link:hover { border-color: var(--violet); background: var(--bg-soft2); transform: translateY(-1px); }

/* ---------- CONTACT / OTHER ---------- */
.contact-grid { display: grid; grid-template-columns: repeat(4, 1fr); gap: 22px; }
.ct-card { border: 1px solid var(--line); border-radius: var(--radius); padding: 26px; background:#fff; text-align:center; transition: all .25s ease; }
.ct-card:hover { box-shadow: var(--shadow-md); transform: translateY(-4px); border-color: transparent; }
.ct-card .ic { font-size: 30px; margin-bottom: 12px; }
.ct-card h4 { font-size: 16px; margin-bottom: 6px; }
.ct-card p { color: var(--ink-2); font-size: 14px; }

/* CTA */
.cta-band { background: var(--grad-main); border-radius: 26px; padding: 56px 40px; text-align: center; color: #fff; box-shadow: var(--shadow-md); }
.cta-band h2 { font-size: 34px; font-weight: 800; margin-bottom: 14px; }
.cta-band p { font-size: 17px; opacity: .9; margin-bottom: 26px; }
.cta-band .btn-white { background:#fff; color: var(--purple); }

/* ---------- FOOTER ---------- */
footer.site { background: #1b1730; color: #c9c4e0; padding: 60px 0 30px; margin-top: 0; }
.foot-grid { display: grid; grid-template-columns: 1.4fr 1fr 1fr 1fr; gap: 40px; }
footer.site .f-logo { display:flex; align-items:center; gap:10px; font-weight:800; font-size:19px; color:#fff; margin-bottom:14px; }
footer.site .f-logo .mark { width:32px;height:32px;border-radius:9px;background:var(--grad-main);display:grid;place-items:center;color:#fff;font-size:17px; }
footer.site p.f-about { font-size: 14px; color: #a7a1c6; max-width: 300px; }
footer.site h5 { color:#fff; font-size:15px; margin-bottom:16px; font-weight:700; }
footer.site ul { list-style:none; display:grid; gap:10px; }
footer.site ul a { font-size:14px; color:#a7a1c6; transition: color .2s; }
footer.site ul a:hover { color:#fff; }
.foot-bottom { border-top: 1px solid rgba(255,255,255,.1); margin-top: 40px; padding-top: 22px; display:flex; justify-content:space-between; align-items:center; flex-wrap:wrap; gap:12px; font-size:13px; color:#968fbb; }
.foot-bottom a { color:#b8b2d6; }
.foot-bottom a:hover { color:#fff; text-decoration: underline; }
.foot-icp { display:flex; gap:18px; align-items:center; flex-wrap: wrap; }

/* reveal：默认可见，仅当 JS 正常运行（<html class="js">）才先做隐藏+滚动动画。
   这样即使 script.js 因任何原因未能加载，下载按钮等核心内容也照常可见。 */
.js .reveal { opacity: 0; transform: translateY(24px); transition: all .7s cubic-bezier(.2,.7,.3,1); }
.js .reveal.in { opacity: 1; transform: none; }

/* responsive */
@media (max-width: 980px) {
  .hero-grid, .about-grid, .dl-layout { grid-template-columns: 1fr; }
  .dl-hero { position: static; }
  .feat-grid, .plat-grid { grid-template-columns: 1fr 1fr; }
  .contact-grid { grid-template-columns: 1fr 1fr; }
  .foot-grid { grid-template-columns: 1fr 1fr; }
  .hero h1 { font-size: 40px; }
}
@media (max-width: 640px) {
  .nav-links, .nav-cta .btn-ghost { display: none; }
  .nav-toggle { display: block; }
  .nav-links.open {
    display: flex; flex-direction: column; position: absolute; top: var(--nav-h); left: 0; right: 0;
    background: #fff; padding: 14px 20px; gap: 4px; box-shadow: var(--shadow-md); border-top: 1px solid var(--line);
  }
  .feat-grid, .plat-grid, .contact-grid, .foot-grid { grid-template-columns: 1fr; }
  .hero h1 { font-size: 33px; }
  .sec-head h2 { font-size: 28px; }
  .hero .stats { gap: 24px; }
  .ver-item { flex-direction: column; align-items: flex-start; }
  .ver-item .v-right { width: 100%; }
  .ver-item .dl-btn { flex: 1; text-align: center; }
}