:root{--primary:#4f7cff;--secondary:#35d6c8;--bg:#f4f8ff;--text:#18263d;--muted:#64748b;--card:#fff;--line:#dfe8f5;--shadow:0 18px 50px rgba(79,124,255,.12)}*{box-sizing:border-box}body{margin:0;font-family:Inter,"PingFang SC","Microsoft YaHei",Arial,sans-serif;color:var(--text);background:linear-gradient(180deg,#fff 0,#f4f8ff 48%,#fff 100%);line-height:1.7}a{text-decoration:none;color:inherit}.container{width:min(1180px,92%);margin:auto}.nav{position:sticky;top:0;z-index:20;background:rgba(255,255,255,.88);backdrop-filter:blur(16px);border-bottom:1px solid rgba(223,232,245,.8)}.nav-in{height:72px;display:flex;align-items:center;justify-content:space-between}.brand{display:flex;gap:10px;align-items:center;font-weight:800}.logo{width:38px;height:38px;border-radius:12px;background:linear-gradient(135deg,var(--primary),var(--secondary));display:grid;place-items:center;color:white;font-size:13px;box-shadow:var(--shadow)}.menu{display:flex;gap:26px;align-items:center;font-size:14px}.btn{display:inline-flex;align-items:center;justify-content:center;padding:13px 22px;border-radius:12px;background:linear-gradient(135deg,var(--primary),var(--secondary));color:#fff;font-weight:700;box-shadow:var(--shadow);border:0}.btn.ghost{background:#fff;color:var(--primary);border:1px solid #cfdcff;box-shadow:none}.hero{padding:84px 0 72px}.hero-grid,.split{display:grid;grid-template-columns:1.05fr .95fr;gap:56px;align-items:center}.eyebrow{color:var(--primary);font-weight:800;letter-spacing:.08em}.hero h1{font-size:clamp(42px,6vw,72px);line-height:1.08;margin:12px 0 20px}.lead{font-size:19px;color:var(--muted);max-width:680px}.actions{display:flex;gap:14px;flex-wrap:wrap;margin-top:28px}.hero-card{background:rgba(255,255,255,.78);border:1px solid #e4ebf7;border-radius:30px;padding:28px;box-shadow:var(--shadow);min-height:420px;position:relative;overflow:hidden}.orb{width:260px;height:260px;border-radius:50%;background:radial-gradient(circle at 35% 35%,#fff 0 7%,#92f0e5 20%,#77a3ff 58%,#dce8ff 100%);margin:48px auto;box-shadow:0 0 70px rgba(79,124,255,.24);position:relative}.orb:after{content:'SILVERFOX';position:absolute;inset:50% auto auto 50%;transform:translate(-50%,-50%);font-weight:900;letter-spacing:.22em;color:#fff}.pill{position:absolute;background:#fff;border:1px solid #dfe8f5;padding:9px 13px;border-radius:999px;font-size:13px;box-shadow:0 10px 30px rgba(31,58,99,.1)}.p1{top:34px;left:28px}.p2{top:85px;right:28px}.p3{bottom:50px;left:40px}.p4{bottom:26px;right:26px}.section{padding:80px 0}.section h2{font-size:38px;line-height:1.2;margin:0 0 14px}.sub{color:var(--muted);max-width:760px}.grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;margin-top:34px}.card{background:#fff;border:1px solid #e2eaf6;border-radius:20px;padding:26px;box-shadow:0 14px 35px rgba(41,72,118,.06)}.icon{width:44px;height:44px;border-radius:13px;background:linear-gradient(135deg,#edf3ff,#e8fbf8);display:grid;place-items:center;margin-bottom:16px;font-size:21px}.devices{grid-template-columns:repeat(4,1fr)}.device{text-align:center}.device strong{display:block;margin-top:10px}.band{background:linear-gradient(135deg,#eef4ff,#edfffb);border:1px solid #dce8f5;border-radius:28px;padding:40px}.steps{counter-reset:s}.step:before{counter-increment:s;content:counter(s);display:grid;place-items:center;width:36px;height:36px;border-radius:50%;background:linear-gradient(135deg,var(--primary),var(--secondary));color:white;font-weight:800;margin-bottom:14px}.footer{padding:46px 0;border-top:1px solid #e4ebf5;background:#fff}.footer-grid{display:grid;grid-template-columns:2fr repeat(3,1fr);gap:34px}.footer small{color:var(--muted)}.page-hero{padding:70px 0 44px}.page-hero h1{font-size:48px;margin:0 0 10px}.tag{display:inline-block;background:#eef4ff;color:var(--primary);border-radius:999px;padding:7px 12px;font-size:13px;font-weight:700}.pricing{grid-template-columns:repeat(3,1fr)}.price{font-size:34px;font-weight:900}.popular-grid{grid-template-columns:repeat(4,1fr)}.article{max-width:820px;margin:auto}.article h2{margin-top:36px}.note{padding:18px;border-radius:16px;background:#f4f8ff;border:1px solid #dfe8f5}.mobile{display:none}@media(max-width:900px){.menu{display:none}.mobile{display:inline-flex}.hero-grid,.split{grid-template-columns:1fr}.grid,.devices,.pricing,.popular-grid{grid-template-columns:1fr 1fr}.hero{padding-top:56px}.hero-card{min-height:360px}.footer-grid{grid-template-columns:1fr 1fr}}@media(max-width:620px){.grid,.devices,.pricing,.popular-grid{grid-template-columns:1fr}.hero h1{font-size:44px}.section h2{font-size:31px}.page-hero h1{font-size:38px}.hero-card{min-height:320px}.orb{width:220px;height:220px}.footer-grid{grid-template-columns:1fr}.actions .btn{width:100%}}

/* Visual media system: brand-neutral illustrations and responsive page imagery */
.hero-media,.page-hero-media,.content-visual{margin:0;position:relative}
.hero-media{border-radius:30px;overflow:hidden;border:1px solid #e4ebf7;box-shadow:var(--shadow);background:#eef5ff;min-height:420px}
.hero-media:after,.page-hero-media:after,.content-visual:after{content:"";position:absolute;inset:auto 10% -18px 10%;height:38px;background:rgba(79,124,255,.15);filter:blur(22px);border-radius:50%;z-index:-1}
.visual-image{display:block;width:100%;height:auto;object-fit:cover}
.hero-media-home .visual-image{height:100%;min-height:420px;object-fit:cover}
.page-hero-grid{display:grid;grid-template-columns:1.02fr .98fr;gap:48px;align-items:center}
.page-hero-copy{min-width:0}
.page-hero-media{border-radius:26px;overflow:hidden;border:1px solid #dfe8f5;background:linear-gradient(135deg,#f8fbff,#eefcf9);box-shadow:0 18px 48px rgba(79,124,255,.11)}
.page-hero-media .visual-image{aspect-ratio:3/2;object-fit:cover}
.content-visual{margin:30px 0 0;border-radius:24px;overflow:hidden;border:1px solid #dfe8f5;background:#f5f9ff;box-shadow:0 16px 40px rgba(79,124,255,.09)}
.content-visual .visual-image{aspect-ratio:3/2;object-fit:cover}
@media(max-width:900px){.page-hero-grid{grid-template-columns:1fr;gap:28px}.page-hero-media{max-width:720px}.hero-media{min-height:auto}.hero-media-home .visual-image{min-height:0;height:auto}}

/* Help center */
.help-search{padding:26px 28px;border-radius:22px;background:linear-gradient(135deg,#eef4ff,#effcf9);border:1px solid #dce8f5}.help-search strong{font-size:22px}.help-categories{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;margin-top:28px}.help-card{display:block;transition:transform .2s ease,box-shadow .2s ease}.help-card:hover{transform:translateY(-4px);box-shadow:0 18px 42px rgba(79,124,255,.13)}.help-card span{color:var(--primary);font-weight:700;font-size:14px}.faq-list{display:grid;gap:12px;margin-top:26px}.faq-list details{background:#fff;border:1px solid #dfe8f5;border-radius:16px;padding:18px 20px}.faq-list summary{cursor:pointer;font-weight:800}.faq-list details p{color:var(--muted);margin-bottom:0}@media(max-width:980px){.help-categories{grid-template-columns:repeat(2,1fr)}}@media(max-width:620px){.help-categories{grid-template-columns:1fr}}

/* SEO rich content v5 */
.seo-rich{padding-top:64px}.rich-intro{font-size:17px;max-width:900px}.rich-grid{grid-template-columns:repeat(3,1fr)}.rich-copy{display:grid;gap:18px;margin-top:34px}.rich-block{background:rgba(255,255,255,.72);border-left:3px solid var(--primary);padding:22px 24px;border-radius:0 18px 18px 0}.rich-block h3{margin:0 0 8px}.rich-block p{margin:0;color:var(--muted)}.rich-faq{margin-top:34px}.related-links{margin-top:28px;display:flex;gap:10px 16px;flex-wrap:wrap;align-items:center}.related-links a{color:var(--primary);font-weight:700;padding:7px 12px;background:#eef4ff;border-radius:999px}.seo-rich .card p{color:var(--muted)}@media(max-width:900px){.rich-grid{grid-template-columns:1fr 1fr}}@media(max-width:620px){.rich-grid{grid-template-columns:1fr}.seo-rich{padding-top:48px}}