*{box-sizing:border-box;margin:0;padding:0}
body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI","PingFang SC","Microsoft YaHei",Arial,sans-serif;background:#f5f7fb;color:#1f2937;line-height:1.75}
a{text-decoration:none;color:inherit}
.container{max-width:1180px;margin:auto;padding:0 18px}
header{background:#ffffffdd;backdrop-filter:blur(12px);border-bottom:1px solid #e5e7eb;position:sticky;top:0;z-index:20}
.nav{height:68px;display:flex;align-items:center;justify-content:space-between}
.logo{font-size:22px;font-weight:900}.logo span{color:#7c3aed}
.nav-links{display:flex;gap:22px;font-size:15px;color:#4b5563}.nav-links a:hover{color:#7c3aed}
.hero{padding:58px 0 34px}.hero-box{background:linear-gradient(135deg,#fff,#eef2ff);border:1px solid #e5e7eb;border-radius:28px;padding:42px;box-shadow:0 20px 50px rgba(31,41,55,.08)}
.badge{display:inline-block;background:#ede9fe;color:#6d28d9;padding:7px 14px;border-radius:999px;font-size:14px;font-weight:700;margin-bottom:16px}
h1{font-size:42px;line-height:1.25;margin-bottom:14px}.hero p{color:#4b5563;font-size:17px;max-width:760px}
.btns{margin-top:26px;display:flex;gap:14px;flex-wrap:wrap}.btn{display:inline-block;padding:11px 22px;border-radius:999px;font-weight:800;background:#7c3aed;color:#fff}.btn.secondary{background:#fff;color:#7c3aed;border:1px solid #ddd6fe}
section{padding:34px 0}.section-title{margin-bottom:22px}.section-title h2{font-size:30px;margin-bottom:6px}.section-title p{color:#6b7280}
.grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}.card{background:#fff;border:1px solid #e5e7eb;border-radius:22px;padding:24px;transition:.2s}.card:hover{transform:translateY(-4px);box-shadow:0 15px 35px rgba(31,41,55,.08)}
.card h3{font-size:21px;margin-bottom:10px}.card p,.card li{color:#4b5563;font-size:15px}.card ul{list-style:none;margin-top:10px}.card li{padding:7px 0;border-bottom:1px dashed #edf0f5}.card li:last-child{border-bottom:0}
.tag{display:inline-block;font-size:12px;color:#6d28d9;background:#f3e8ff;padding:4px 10px;border-radius:999px;margin-bottom:12px}
.breadcrumb{font-size:14px;color:#6b7280;margin:24px 0}.breadcrumb a{color:#7c3aed}
.article{background:#fff;border:1px solid #e5e7eb;border-radius:26px;padding:34px;box-shadow:0 10px 28px rgba(31,41,55,.05)}.article h1{font-size:36px}.article h2{font-size:24px;margin-top:28px;margin-bottom:8px}.article p{color:#4b5563;margin:8px 0}
.related{display:grid;grid-template-columns:repeat(3,1fr);gap:14px;margin-top:18px}.related a{background:#fff;border:1px solid #e5e7eb;border-radius:18px;padding:16px;color:#374151}
.safe{background:#111827;color:white;border-radius:24px;padding:28px;margin-top:28px}.safe p{color:#d1d5db}
footer{margin-top:38px;padding:28px 0;text-align:center;color:#6b7280;border-top:1px solid #e5e7eb;background:#fff}
@media(max-width:900px){.grid,.related{grid-template-columns:1fr}.nav-links{display:none}.hero-box{padding:28px}h1{font-size:32px}.article{padding:24px}}

.os-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:18px;margin:22px 0}
.os-box{border:1px solid #e5e7eb;background:#f9fafb;border-radius:22px;padding:22px}
.os-box h2{margin-top:0!important}
.step-list{margin-top:10px;padding-left:18px;color:#4b5563}
.step-list li{margin:8px 0}
@media(max-width:900px){.os-grid{grid-template-columns:1fr}}

.download-note{background:#eef2ff;border:1px solid #c7d2fe;color:#3730a3;border-radius:18px;padding:15px 16px;margin:12px 0;font-size:15px}
.ios-note{background:#fff7ed;border:1px solid #fed7aa;color:#9a3412;border-radius:18px;padding:15px 16px;margin:12px 0;font-size:15px}