:root{
  --text:#1f2329;
  --body:#5f646d;
  --muted:#8b909a;
  --border:#e5e6ea;
  --panel:#ffffff;
  --bg:#f5f6f8;
  --accent:#2563eb;
  --accent-dark:#1d4ed8;
  --maxw:1040px;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  color:var(--text);
  background:var(--panel);
  line-height:1.65;
  -webkit-font-smoothing:antialiased;
}
a{color:inherit;text-decoration:none}
.container{max-width:var(--maxw);margin:0 auto;padding:0 22px}
h1,h2,h3{line-height:1.3;font-weight:700}
.lead{color:var(--body)}

/* buttons */
.btn{display:inline-flex;align-items:center;gap:8px;border:1px solid transparent;border-radius:6px;padding:10px 18px;font-size:14px;font-weight:600;cursor:pointer;transition:background .15s,border-color .15s,color .15s}
.btn svg{flex:none}
.btn-primary{background:var(--accent);color:#fff}
.btn-primary:hover{background:var(--accent-dark)}
.btn-outline{background:#fff;color:var(--text);border-color:var(--border)}
.btn-outline:hover{border-color:#c9ccd3}
.btn-sm{padding:8px 14px;font-size:13px}

/* ---------- sticky header ---------- */
.site-header{position:sticky;top:0;z-index:100;background:var(--panel);border-bottom:1px solid var(--border)}
.header{display:flex;align-items:center;justify-content:space-between;height:60px}
.logo{display:flex;align-items:center;gap:9px;font-size:17px;font-weight:700}
.logo .logo-ico{width:28px;height:28px;flex:none}
.nav{display:flex;gap:26px;font-size:14px;color:var(--body)}
.nav a:hover{color:var(--text)}
.nav a.active{color:var(--text);font-weight:600}

/* ---------- hero (home) ---------- */
.hero{background:var(--panel);padding:44px 0 48px}
.hero-grid{display:grid;grid-template-columns:1fr 1.05fr;gap:52px;align-items:center}
.hero h1{font-size:clamp(30px,4vw,44px);margin-bottom:12px}
.hero .lead{font-size:16px;max-width:26em}
.hero-cta{display:flex;gap:12px;margin:20px 0 12px;flex-wrap:wrap}
.hero-note{font-size:13px;color:var(--muted)}

/* ---------- section / page head ---------- */
section{padding:44px 0}
section.alt{background:var(--bg)}
.sec-head{max-width:720px;margin:0 auto 30px}
.sec-head.center{text-align:center}
.sec-head h1,.sec-head h2{font-size:clamp(24px,3vw,32px);margin-bottom:8px}
.sec-head p{color:var(--body);font-size:15.5px}
.sec-head.row{display:flex;align-items:flex-end;justify-content:space-between;gap:24px;text-align:left;max-width:none;margin-bottom:26px}
.sec-head.row p{margin-bottom:0}
.page-head{text-align:center;padding:44px 0 0}
.page-head h1{font-size:clamp(28px,3.2vw,34px);margin-bottom:10px}
.page-head p{color:var(--body);font-size:15.5px;max-width:34em;margin:0 auto}

/* ---------- framework for screenshots ---------- */
.shot-frame{background:#eef0f3;border:1px solid var(--border);border-radius:10px;padding:16px}

/* ---------- screenshots as images ---------- */
.shot-img{display:block;width:100%;max-width:460px;height:auto;margin:0 auto;border-radius:8px;box-shadow:0 1px 2px rgba(0,0,0,.04),0 8px 24px rgba(20,24,32,.06)}

/* ---------- home: feature highlights + link cards ---------- */
.highlights{display:grid;grid-template-columns:repeat(4,1fr);gap:18px;list-style:none}
.highlight{background:var(--panel);border:1px solid var(--border);border-radius:10px;padding:18px}
.highlight h3{font-size:15.5px;margin-bottom:4px}
.highlight p{font-size:13.5px;color:var(--body)}
.more-link{display:inline-flex;align-items:center;gap:6px;color:var(--accent);font-size:14px;font-weight:600;margin-top:4px}
.more-link:hover{color:var(--accent-dark)}
.more-link svg{transition:transform .15s}
.more-link:hover svg{transform:translateX(3px)}
.card-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:18px}
.link-card{display:flex;align-items:center;justify-content:space-between;gap:20px;background:var(--panel);border:1px solid var(--border);border-radius:10px;padding:18px 20px}
.link-card h3{font-size:16px;margin-bottom:4px}
.link-card p{font-size:13.5px;color:var(--body)}
.link-card .icon{width:40px;height:40px;border-radius:9px;background:#eef1f6;color:var(--accent);display:grid;place-items:center;flex:none}
.link-card:hover{border-color:#c9ccd3}
.band{background:var(--accent);border-radius:12px;color:#fff;padding:28px 28px;display:flex;align-items:center;justify-content:space-between;gap:20px;flex-wrap:wrap}
.band h2{font-size:22px;margin-bottom:4px}
.band p{opacity:.92;font-size:15px}
.band .btn{background:#fff;color:var(--accent)}
.band .btn:hover{background:#f2f4f8}

/* ---------- full features ---------- */
.feature-list{display:grid;grid-template-columns:repeat(2,1fr);gap:18px}
.feature{background:var(--panel);border:1px solid var(--border);border-radius:10px;padding:20px}
.feature .f-ico{width:40px;height:40px;border-radius:8px;background:#eef1f6;color:var(--accent);display:grid;place-items:center;margin-bottom:12px}
.feature h3{font-size:17px;margin-bottom:4px}
.feature p{font-size:14px;color:var(--body)}

/* ---------- screenshots page ---------- */
.shots{display:grid;grid-template-columns:1.3fr .7fr;gap:20px;align-items:start}
.shot{background:var(--panel);border:1px solid var(--border);border-radius:12px;padding:18px}
.shot figcaption{margin-top:10px;font-size:13px;color:var(--body);display:flex;align-items:center;gap:8px}
.shot figcaption .tag{display:inline-block;background:#eef1f6;color:var(--body);border-radius:4px;padding:2px 8px;font-size:12px}

/* ---------- download page ---------- */
.dl-list{background:var(--panel);border:1px solid var(--border);border-radius:10px;overflow:hidden}
.dl-row{display:flex;align-items:center;justify-content:space-between;gap:20px;padding:14px 22px;border-bottom:1px solid var(--border)}
.dl-row:last-child{border-bottom:none}
.dl-name{font-size:15px;font-weight:600}
.dl-meta{font-size:13px;color:var(--muted);margin-top:2px}
.dl-btn{white-space:nowrap}

/* ---------- footer ---------- */
footer{border-top:1px solid var(--border);padding:32px 0}
.foot{display:flex;justify-content:space-between;gap:30px;flex-wrap:wrap;align-items:flex-start}
.foot-brand{display:flex;align-items:center;gap:9px;font-weight:700;font-size:16px;margin-bottom:10px}
.foot-brand .logo-ico{width:26px;height:26px}
.foot p{font-size:13.5px;color:var(--body);max-width:26em}
.foot-nav{display:flex;gap:24px;font-size:14px;color:var(--body)}
.foot-nav a:hover{color:var(--text)}
.copy{border-top:1px solid var(--border);margin-top:22px;padding-top:14px;display:flex;justify-content:space-between;gap:12px;flex-wrap:wrap;font-size:12.5px;color:var(--muted)}

/* ---------- responsive ---------- */
@media(max-width:900px){
  .hero-grid{grid-template-columns:1fr;gap:34px}
  .highlights{grid-template-columns:repeat(2,1fr)}
  .shots{grid-template-columns:1fr}
}
@media(max-width:600px){
  .nav{display:none}
  .sec-head.row{flex-direction:column;align-items:flex-start;gap:10px}
  .highlights,.feature-list,.card-grid{grid-template-columns:1fr}
  .hero-cta{flex-wrap:wrap}
  .dl-row{flex-direction:column;align-items:flex-start;gap:12px}
  .app{font-size:3.6cqw}
  .band{flex-direction:column;align-items:flex-start}
}

/* 暂无下载链接的占位按钮 */
.btn.off,.btn.off:hover{background:#edf0f5;color:#a7aeba;border-color:#e5e6ea;box-shadow:none;cursor:not-allowed}