:root{
  --bg:#ffffff;
  --bg-alt:#f5f5f7;
  --fg:#1d1d1f;
  --muted:#6e6e73;
  --primary:#0071e3;
  --primary-2:#0071e3;
  --card:#ffffff;
  --border:#d2d2d7;
  --radius:18px;
  --maxw:980px;
  --shadow:0 4px 20px rgba(0,0,0,.06);
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:-apple-system,BlinkMacSystemFont,"SF Pro Text","SF Pro Display","PingFang SC","Helvetica Neue",Helvetica,Arial,sans-serif;
  background:var(--bg);color:var(--fg);line-height:1.6;-webkit-font-smoothing:antialiased;font-size:17px}
a{color:inherit;text-decoration:none}
img{max-width:100%}
.container{max-width:var(--maxw);margin:0 auto;padding:0 22px}

/* 导航栏：苹果风毛玻璃浅底 */
.navbar{position:fixed;top:0;left:0;right:0;z-index:50;transition:.3s;
  background:rgba(255,255,255,.8);backdrop-filter:saturate(180%) blur(20px);
  -webkit-backdrop-filter:saturate(180%) blur(20px);border-bottom:1px solid rgba(0,0,0,.08)}
.navbar.scrolled{background:rgba(255,255,255,.92)}
.nav-inner{display:flex;align-items:center;justify-content:space-between;height:52px}
.brand{display:flex;align-items:center;gap:8px;font-weight:600;font-size:19px;letter-spacing:-.01em}
.brand-mark{color:var(--primary)}
.nav-links{display:flex;align-items:center;gap:28px}
.nav-links a{color:var(--muted);font-size:14px;transition:.2s}
.nav-links a:hover{color:var(--fg)}
.nav-links a.btn-primary,.nav-links a.btn-primary:hover{color:#fff;font-weight:600}
.nav-toggle{display:none;background:none;border:0;color:var(--fg);font-size:24px;cursor:pointer}

/* 按钮：苹果胶囊 */
.btn{display:inline-block;padding:11px 22px;border-radius:980px;font-weight:500;font-size:15px;transition:.2s;cursor:pointer}
.btn-sm{padding:7px 16px;font-size:14px}
.btn-primary{background:var(--primary);color:#fff}
.btn-primary:hover{background:#0077ed;transform:translateY(-1px)}
.btn-ghost{border:1px solid var(--border);color:var(--fg)}
.btn-ghost:hover{border-color:var(--fg)}

/* 首屏 Hero：浅色渐变 */
.hero{padding:130px 0 80px;text-align:center;background:linear-gradient(180deg,#fbfbfd 0%,#ffffff 100%)}
.hero-eyebrow{color:var(--primary);font-size:14px;font-weight:600;letter-spacing:.02em;margin-bottom:14px}
.hero-title{font-size:clamp(32px,5.5vw,56px);line-height:1.08;font-weight:700;letter-spacing:-.02em}
.grad{background:linear-gradient(135deg,#0071e3,#42a5f5);-webkit-background-clip:text;background-clip:text;color:transparent}
.hero-sub{color:var(--muted);font-size:19px;max-width:620px;margin:20px auto 32px}
.hero-actions{display:flex;gap:14px;justify-content:center;flex-wrap:wrap}
.hero-shot{margin:60px auto 0;max-width:840px}
.shot-placeholder{height:380px;border:1px solid var(--border);border-radius:var(--radius);
  display:flex;align-items:center;justify-content:center;color:var(--muted);background:#f5f5f7;font-size:15px}

/* 区块 */
.section{padding:96px 0}
.section-alt{background:var(--bg-alt)}
.section-title{font-size:clamp(26px,4vw,40px);text-align:center;font-weight:700;letter-spacing:-.02em}
.section-sub{color:var(--muted);text-align:center;margin:12px 0 52px;font-size:18px}

/* 网格与卡片：白卡柔和阴影 */
.grid{display:grid;gap:22px}
.grid-3{grid-template-columns:repeat(3,1fr)}
.card{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);padding:32px;transition:.25s;box-shadow:var(--shadow);
  opacity:0;transform:translateY(20px)}
.card.in{opacity:1;transform:none}
.card:hover{transform:translateY(-4px);box-shadow:0 10px 30px rgba(0,0,0,.09)}
.card-icon{font-size:34px;margin-bottom:16px}
.card h3{font-size:20px;margin-bottom:8px;font-weight:600;letter-spacing:-.01em}
.card p{color:var(--muted);font-size:15px}

/* 功能展示 */
.showcase-row{display:grid;grid-template-columns:1fr 1fr;gap:48px;align-items:center;margin-bottom:72px;
  opacity:0;transform:translateY(20px);transition:.6s}
.showcase-row.in{opacity:1;transform:none}
.showcase-row.reverse{direction:rtl}
.showcase-row.reverse>*{direction:ltr}
.showcase-text h3{font-size:28px;margin-bottom:14px;font-weight:700;letter-spacing:-.02em}
.showcase-text p{color:var(--muted);margin-bottom:16px;font-size:17px}
.showcase-text ul{list-style:none;color:var(--muted);font-size:16px}
.showcase-text li{padding-left:26px;position:relative;margin:10px 0}
.showcase-text li::before{content:"✓";color:var(--primary);position:absolute;left:0;font-weight:700}
.showcase-img .shot-placeholder{height:300px}

/* 下载 */
.download-btns{display:flex;gap:14px;justify-content:center;flex-wrap:wrap;margin-bottom:28px}
.download-note{color:var(--muted);font-size:15px}
.link{color:var(--primary)}
.link:hover{text-decoration:underline}
.trial-box{display:flex;flex-direction:column;align-items:center;gap:14px;margin:6px 0 14px}
.trial-input{width:100%;max-width:380px;padding:14px 20px;border:1px solid var(--border);border-radius:14px;font-size:15px;line-height:1.4;outline:none;background:#fff;color:var(--fg);transition:.2s}
.trial-input::placeholder{color:var(--muted)}
.trial-input:focus{border-color:var(--primary);box-shadow:0 0 0 3px rgba(0,113,227,.15)}
.trial-result{color:var(--primary);font-size:15px;margin-bottom:8px;min-height:22px;font-weight:500;text-align:center}

/* 联系 */
.contact p{color:var(--muted);font-size:17px;text-align:center}

/* 页脚 */
.footer{border-top:1px solid var(--border);padding:30px 0;color:var(--muted);font-size:13px}
.footer .container{display:flex;justify-content:space-between;flex-wrap:wrap;gap:10px}
.footer-links a{margin:0 6px}
.footer-links a:hover{color:var(--fg)}

/* 响应式 */
@media(max-width:860px){
  .nav-links{position:absolute;top:52px;left:0;right:0;background:rgba(255,255,255,.96);
    backdrop-filter:blur(20px);-webkit-backdrop-filter:blur(20px);flex-direction:column;gap:0;
    padding:0;max-height:0;overflow:hidden;transition:.3s;border-bottom:1px solid rgba(0,0,0,.08)}
  .nav-links.open{max-height:340px;padding:10px 0}
  .nav-links a{padding:12px 22px;width:100%}
  .nav-toggle{display:block}
  .grid-3{grid-template-columns:1fr}
  .showcase-row,.showcase-row.reverse{grid-template-columns:1fr;direction:ltr}
  .section{padding:64px 0}
  body{font-size:16px}
}

/* 下载：版本元信息 + 历史版本链接 */
.download-meta{color:var(--muted);font-size:14px;margin:6px 0 2px;min-height:18px}
.history-link{margin:2px 0 0;font-size:13px;text-align:center}
.history-link a{color:var(--muted)}
.history-link a:hover{color:var(--primary);text-decoration:underline}

/* 历史版本列表 */
.version-list{max-width:760px;margin:0 auto;display:flex;flex-direction:column;gap:16px}
.version-loading{color:var(--muted);text-align:center;padding:40px 0}
.ver-item{background:var(--card);border:1px solid var(--border);border-radius:var(--radius);padding:22px 24px;box-shadow:var(--shadow);transition:.25s}
.ver-item:hover{transform:translateY(-2px);box-shadow:0 10px 30px rgba(0,0,0,.09)}
.ver-head{display:flex;align-items:center;gap:14px;flex-wrap:wrap}
.ver-name{font-size:20px;font-weight:600;letter-spacing:-.01em}
.ver-badge{background:var(--primary);color:#fff;font-size:12px;font-weight:600;padding:2px 10px;border-radius:980px}
.ver-date{color:var(--muted);font-size:14px}
.ver-size{color:var(--muted);font-size:14px}
.ver-head .btn{margin-left:auto}
.ver-log{color:var(--muted);font-size:15px;margin-top:12px;line-height:1.7;white-space:normal}
.history-back{text-align:center;margin-top:36px;font-size:15px}