*{box-sizing:border-box;margin:0;padding:0}
:root{--bg:#f8fafb;--bg2:#f0f4f6;--bg3:#e6ecef;--text:#1a2332;--muted:#5a6a7a;--accent:#0ea5e9;--accent2:#6366f1;--accent-soft:rgba(14,165,233,.08);--border:#dce4ea;--card:#fff;--radius:12px;--shadow:0 2px 12px rgba(0,0,0,.06)}
html{scroll-behavior:smooth}
body{background:var(--bg);color:var(--text);font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",sans-serif;font-size:15px;line-height:1.7}
a{color:var(--accent);text-decoration:none}a:hover{text-decoration:underline}
img{max-width:100%;height:auto;display:block;border-radius:var(--radius)}
.top-bar{position:sticky;top:0;z-index:100;background:rgba(248,250,251,.92);backdrop-filter:blur(12px);border-bottom:1px solid var(--border)}
.tb-inner{max-width:1200px;margin:0 auto;padding:12px 16px;display:flex;align-items:center;justify-content:space-between}
.site-logo{display:flex;align-items:center;gap:10px;color:var(--text);font-weight:800;font-size:17px;text-decoration:none}
.site-logo img{width:36px;height:36px;border-radius:8px}
.hamburger{display:none;background:none;border:none;color:var(--text);font-size:24px;cursor:pointer}
.main-nav a{margin-left:18px;color:var(--muted);font-size:13px;font-weight:600}
.main-nav a:hover,.main-nav a.active{color:var(--accent)}
.ad-strip{background:var(--bg2);border-bottom:1px solid var(--border);padding:16px}
.ad-wrap{max-width:1200px;margin:0 auto}
.ad-row{display:grid;grid-template-columns:repeat(2,1fr);gap:12px}
.ad-row a{display:block;background:var(--card);border:1px solid var(--border);border-radius:10px;overflow:hidden;text-align:center;text-decoration:none;box-shadow:var(--shadow)}
.ad-row img{width:100%;aspect-ratio:16/9;object-fit:cover}
.ad-row .name{padding:6px;font-size:11px;color:var(--muted)}
.stick-footer{position:fixed;bottom:0;left:0;right:0;z-index:99;background:rgba(248,250,251,.95);backdrop-filter:blur(12px);border-top:1px solid var(--border);padding:10px 16px;display:none}
.sf-inner{max-width:1200px;margin:0 auto;text-align:center}
.dl-btn,.big-btn{display:inline-block;padding:11px 32px;background:linear-gradient(135deg,var(--accent),var(--accent2));color:#fff;border-radius:999px;font-weight:700;font-size:14px;text-decoration:none;border:none;cursor:pointer;box-shadow:0 4px 16px rgba(14,165,233,.2)}
.big-btn{font-size:16px;padding:14px 40px}
.big-btn:hover{transform:scale(1.02);text-decoration:none}
main{max-width:1200px;margin:0 auto;padding:0 16px 80px}
.intro-area{padding:44px 0 32px;text-align:center}
.intro-area h1{font-size:clamp(22px,4.5vw,38px);line-height:1.3;color:var(--text)}
.intro-area .desc{max-width:700px;margin:14px auto 0;color:var(--muted);font-size:15px}
.pill-row{display:flex;flex-wrap:wrap;justify-content:center;gap:8px;margin-top:18px}
.pill-row span{padding:5px 12px;background:var(--accent-soft);color:var(--accent);border-radius:999px;font-size:11px;font-weight:700}
.segment{padding:36px 0}
.segment h2{font-size:clamp(18px,3.2vw,26px);margin-bottom:18px;color:var(--text);padding-left:14px;position:relative}
.segment h2::before{content:"";position:absolute;left:0;top:3px;bottom:3px;width:3px;background:linear-gradient(180deg,var(--accent),var(--accent2));border-radius:2px}
.boxes{display:grid;grid-template-columns:repeat(auto-fill,minmax(250px,1fr));gap:12px}
.box{padding:20px;background:var(--card);border:1px solid var(--border);border-radius:var(--radius);transition:box-shadow .2s;box-shadow:var(--shadow)}
.box:hover{box-shadow:0 4px 20px rgba(14,165,233,.12)}
.box h3{font-size:15px;margin-bottom:6px;color:var(--text)}
.box p{color:var(--muted);font-size:13px;line-height:1.6}
.content{max-width:840px}
.content p{color:var(--muted);margin-bottom:14px;font-size:14px}
.content p:last-child{margin-bottom:0}
.screens{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:14px;margin-top:14px}
.screens figure{margin:0;background:var(--card);border:1px solid var(--border);border-radius:var(--radius);overflow:hidden;box-shadow:var(--shadow)}
.screens figcaption{padding:8px 12px;font-size:12px;color:var(--muted);text-align:center}
.help-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:12px}
.help-item{padding:18px;background:var(--card);border:1px solid var(--border);border-radius:var(--radius);box-shadow:var(--shadow)}
.help-item h3{font-size:14px;color:var(--accent);margin-bottom:6px}
.help-item p{color:var(--muted);font-size:13px}
.cta-area{text-align:center;padding:32px 0}
.bottom-bar{border-top:1px solid var(--border);padding:24px 16px;text-align:center;background:var(--bg2)}
.bb-inner{max-width:1200px;margin:0 auto}
.bb-links{display:flex;flex-wrap:wrap;justify-content:center;gap:14px;margin-bottom:10px}
.bb-links a{color:var(--muted);font-size:12px}
.bb-copy{color:#999;font-size:11px}
@media(max-width:768px){.hamburger{display:block}.main-nav{display:none;position:absolute;top:100%;left:0;right:0;background:var(--bg2);padding:14px;border-bottom:1px solid var(--border)}.main-nav.open{display:flex;flex-direction:column;gap:10px}.main-nav a{margin-left:0}.boxes{grid-template-columns:1fr}.help-grid{grid-template-columns:1fr}.screens{grid-template-columns:1fr 1fr}.intro-area{padding:28px 0 20px}}
@media(min-width:769px){.ad-row{grid-template-columns:repeat(4,1fr)}.stick-footer{display:block}}