:root{
  --bg:#ffffff;--bg-2:#f5f8fd;
  --surface:#ffffff;--surface-2:#eef3fb;
  --line:#d8e2f0;--text:#0b1a33;--muted:#5b6b85;
  --primary:#1d4ed8;--primary-2:#3b82f6;--primary-deep:#1e3a8a;
  --accent:#0ea5e9;
  --radius:14px;--radius-lg:22px;
  --shadow-primary:0 10px 30px -8px #1d4ed859;
  --shadow-card:0 20px 60px -20px rgba(0,0,0,.6);
  --font-display:'Fraunces',system-ui,sans-serif;
  --font-body:'Inter',system-ui,sans-serif;
}
*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:var(--font-body);background:var(--bg);color:var(--text);line-height:1.55;overflow-x:hidden;-webkit-font-smoothing:antialiased}
body::before{content:"";position:fixed;inset:0;background:radial-gradient(900px 500px at 80% -10%,rgba(29,78,216,.06),transparent 60%),radial-gradient(700px 500px at -10% 30%,rgba(14,165,233,.05),transparent 65%),radial-gradient(600px 400px at 50% 110%,rgba(59,130,246,.04),transparent 65%);z-index:-2;pointer-events:none}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
button{font:inherit;border:0;background:none;color:inherit;cursor:pointer}
.container{width:min(1180px,92%);margin-inline:auto}
h1,h2,h3,h4{font-family:var(--font-display);font-weight:700;letter-spacing:-0.01em;line-height:1.15}
h1{font-size:clamp(2rem,5vw,3.6rem)}
h2{font-size:clamp(1.4rem,3.2vw,2.2rem);margin-bottom:.6em}
h3{font-size:1.15rem}
.accent{background:linear-gradient(135deg,var(--primary-2),var(--primary));-webkit-background-clip:text;background-clip:text;color:transparent}
.eyebrow{display:inline-flex;gap:.5rem;align-items:center;font-size:.78rem;letter-spacing:.18em;text-transform:uppercase;color:var(--primary);font-weight:600;padding:.5rem .9rem;border:1px solid #1d4ed859;border-radius:999px;background:#1d4ed81a}

.btn{display:inline-flex;align-items:center;justify-content:center;gap:.5rem;padding:.95rem 1.6rem;font-family:var(--font-display);font-weight:600;font-size:.95rem;border-radius:999px;transition:transform .2s ease,box-shadow .2s ease;white-space:nowrap}
.btn-primary{background:linear-gradient(135deg,var(--primary-2) 0%,var(--primary) 50%,var(--primary-deep) 100%);color:#0a0a0a;box-shadow:var(--shadow-primary)}
.btn-primary:hover{transform:translateY(-2px)}
.btn-ghost{border:1px solid var(--line);color:var(--text)}
.btn-ghost:hover{border-color:var(--primary);color:var(--primary)}
.btn-sm{padding:.65rem 1.1rem;font-size:.85rem}

header{position:sticky;top:0;z-index:50;backdrop-filter:blur(18px);background:#ffffffb8;border-bottom:1px solid rgba(255,255,255,.05)}
.nav{display:flex;align-items:center;justify-content:space-between;padding:1rem 0}
.logo{display:flex;align-items:center;gap:.6rem;font-family:var(--font-display);font-weight:800;font-size:1.25rem}
.logo-mark{width:36px;height:36px;border-radius:10px;background:linear-gradient(135deg,var(--primary-2),var(--primary-deep));display:grid;place-items:center;color:#0a0a0a;font-weight:800;box-shadow:var(--shadow-primary)}
.logo-mark-img{background:transparent;box-shadow:none;overflow:hidden;padding:0}
.logo-mark-img img{width:100%;height:100%;object-fit:cover;display:block;border-radius:inherit}
.logo span:last-child{color:var(--primary)}
.nav-links{display:none;gap:.3rem;align-items:center}
.nav-links a{padding:.55rem .9rem;font-size:.9rem;color:var(--muted);border-radius:8px;font-weight:500}
.nav-links a:hover,.nav-links a.active{color:var(--primary);background:#1d4ed814}
.nav-cta{display:flex;gap:.5rem;align-items:center}
.menu-toggle{width:42px;height:42px;display:grid;place-items:center;border:1px solid var(--line);border-radius:10px}
@media(min-width:980px){.nav-links{display:flex}.menu-toggle{display:none}}
.drawer{position:fixed;inset:0;z-index:60;background:#fffffff2;backdrop-filter:blur(20px);padding:5rem 1.5rem 2rem;transform:translateY(-100%);transition:transform .35s ease;overflow-y:auto}
.drawer.open{transform:translateY(0)}
.drawer a{display:block;padding:.9rem 0;border-bottom:1px solid var(--line);font-size:1rem}
.drawer-close{position:absolute;top:1rem;right:1rem;width:42px;height:42px;border-radius:10px;border:1px solid var(--line)}

section{padding:4rem 0;position:relative}
.section-head{text-align:center;max-width:760px;margin:0 auto 2.5rem}
.section-head .lead{color:var(--muted);font-size:1.02rem;margin-top:.8rem}

.hero{padding:4rem 0 3rem}
.hero-sub{color:var(--muted);font-size:1.05rem;max-width:60ch;margin:1.2rem 0 2rem}
.hero-ctas{display:flex;flex-wrap:wrap;gap:.8rem}

/* hero 带 logo 时变成左右分栏 */
.hero-with-logo .container{display:grid;gap:2rem;grid-template-columns:1fr}
@media(min-width:920px){
  .hero-with-logo .container{grid-template-columns:1.3fr 1fr;gap:3rem;align-items:center}
}
.hero-logo{
  border-radius:var(--radius-lg);overflow:hidden;
  border:1px solid var(--line);
  background:linear-gradient(180deg,var(--surface-2),var(--surface));
  box-shadow:var(--shadow-card);
  position:relative;
  aspect-ratio:1/1;
}
.hero-logo img{
  width:100%;height:100%;object-fit:cover;display:block;
}

.trust-row{display:grid;grid-template-columns:repeat(2,1fr);gap:.8rem;margin-top:2.5rem}
@media(min-width:600px){.trust-row{grid-template-columns:repeat(4,1fr)}}
.trust-badge{padding:.9rem 1rem;border:1px solid var(--line);border-radius:12px;display:flex;align-items:center;gap:.6rem;background:linear-gradient(180deg,rgba(255,255,255,.03),transparent)}
.trust-badge .icon{font-size:1.3rem}
.trust-badge .txt{font-size:.78rem;color:var(--muted);line-height:1.2}
.trust-badge .txt b{display:block;color:var(--text);font-size:.92rem;margin-bottom:2px}

.card-grid{display:grid;gap:1rem;grid-template-columns:1fr}
@media(min-width:720px){.card-grid{grid-template-columns:repeat(2,1fr)}}
@media(min-width:1000px){.card-grid.cg-3{grid-template-columns:repeat(3,1fr)}}
.card{padding:1.6rem;border-radius:var(--radius-lg);background:linear-gradient(180deg,var(--surface),#ffffff99);border:1px solid var(--line);position:relative;overflow:hidden}
.card h3{font-size:1.1rem;margin-bottom:.7rem;color:var(--primary)}
.card p{color:var(--muted);font-size:.95rem}
.card .ico{width:48px;height:48px;border-radius:12px;background:linear-gradient(135deg,#1d4ed840,#1d4ed80d);display:grid;place-items:center;font-size:1.5rem;margin-bottom:1rem}

.section-banner{width:100%;height:260px;object-fit:cover;border-radius:var(--radius-lg);margin-bottom:2.5rem;filter:brightness(.55) saturate(1.2);border:1px solid var(--line);box-shadow:0 30px 80px -30px rgba(0,0,0,.5)}

.compare{overflow-x:auto;margin-top:2rem}
.compare table{width:100%;min-width:600px;border-collapse:collapse}
.compare th,.compare td{padding:1rem;text-align:left;border-bottom:1px solid var(--line);font-size:.92rem}
.compare th{background:#1d4ed814;color:var(--primary);font-family:var(--font-display);font-weight:600;font-size:.85rem;text-transform:uppercase;letter-spacing:.1em}
.compare td:nth-child(2){color:var(--primary);font-weight:600}

.faq{max-width:780px;margin:0 auto}
.faq-item{border:1px solid var(--line);border-radius:var(--radius);margin-bottom:.7rem;overflow:hidden;background:var(--surface)}
.faq-item summary{list-style:none;padding:1.2rem 1.4rem;font-family:var(--font-display);font-weight:600;font-size:1rem;cursor:pointer;display:flex;justify-content:space-between;align-items:center;gap:1rem}
.faq-item summary::-webkit-details-marker{display:none}
.faq-item summary::after{content:"+";color:var(--primary);font-size:1.5rem;transition:transform .2s ease}
.faq-item[open] summary::after{transform:rotate(45deg)}
.faq-item .answer{padding:0 1.4rem 1.4rem;color:var(--muted);font-size:.95rem}

.final-cta{text-align:center;padding:4rem 2rem;border-radius:var(--radius-lg);background:radial-gradient(600px 300px at 50% 0%,#1d4ed82e,transparent 70%),linear-gradient(180deg,var(--surface-2),var(--surface));border:1px solid var(--line);margin:2rem 0}
.final-cta h2{max-width:600px;margin-inline:auto}
.final-cta p{color:var(--muted);margin:1rem auto 2rem;max-width:600px}

footer{background:#ffffff;padding:4rem 0 2rem;border-top:1px solid var(--line)}
.foot-grid{display:grid;gap:2rem;grid-template-columns:1fr}
@media(min-width:720px){.foot-grid{grid-template-columns:1.5fr 1fr 1fr 1fr}}
.foot-grid h4{color:var(--primary);font-size:.85rem;text-transform:uppercase;letter-spacing:.15em;margin-bottom:1rem;font-family:var(--font-body);font-weight:700}
.foot-grid ul{list-style:none}
.foot-grid li{padding:.3rem 0}
.foot-grid a{color:var(--muted);font-size:.9rem}
.foot-grid a:hover{color:var(--primary)}
.foot-about p{color:var(--muted);font-size:.88rem;margin:1rem 0}
.foot-bottom{margin-top:3rem;padding-top:2rem;border-top:1px solid var(--line);display:flex;flex-wrap:wrap;justify-content:space-between;gap:1rem;color:var(--muted);font-size:.82rem}
.foot-badges{display:flex;gap:1rem;flex-wrap:wrap}
.foot-badges span{padding:.3rem .7rem;border:1px solid var(--line);border-radius:6px;font-size:.75rem}
.age{margin-top:1.5rem;text-align:center;color:var(--muted);font-size:.78rem;padding:1rem;border:1px dashed var(--line);border-radius:var(--radius)}
.age strong{color:var(--accent)}

.reveal{opacity:0;transform:translateY(20px);transition:opacity .8s ease,transform .8s ease}
.reveal.in{opacity:1;transform:translateY(0)}

/* ============================================================
   HOMEPAGE SEO BLOCK — 共享基础 + classic 风格
   ============================================================ */
.seo-block{padding:4.5rem 0;position:relative}
.seo-block .section-head{max-width:820px}
.seo-block .section-head h2{
  font-size:clamp(1.6rem,3.4vw,2.4rem);letter-spacing:-0.015em;line-height:1.2;
}
.seo-block .section-head .lead{
  font-size:1.02rem;line-height:1.7;color:var(--muted);margin-top:1rem;
}

/* 关键词内链 */
.seo-block a.kw{
  color:var(--primary);font-weight:600;
  border-bottom:1px solid #1d4ed840;
  transition:border-color .2s ease,color .2s ease;
}
.seo-block a.kw:hover{
  color:var(--primary-2);border-bottom-color:var(--primary);
}

/* ---------- CLASSIC 风格:2 列卡片 ---------- */
.seo-block-classic .seo-grid{
  display:grid;gap:1.2rem;grid-template-columns:1fr;margin-top:1rem;
}
@media(min-width:780px){
  .seo-block-classic .seo-grid{grid-template-columns:repeat(2,1fr);gap:1.4rem}
}
.seo-card{
  padding:1.8rem;border-radius:var(--radius-lg);
  background:linear-gradient(180deg,var(--surface),#ffffff99);
  border:1px solid var(--line);position:relative;overflow:hidden;
  transition:transform .25s ease,border-color .25s ease;
}
.seo-card::before{
  content:"";position:absolute;left:0;top:0;width:3px;height:100%;
  background:linear-gradient(180deg,var(--primary-2),var(--primary));
  opacity:.7;
}
.seo-card:hover{transform:translateY(-2px);border-color:#1d4ed859}
.seo-card h3{
  font-family:var(--font-display);font-size:1.15rem;font-weight:700;
  color:var(--primary);margin-bottom:.9rem;line-height:1.3;letter-spacing:-0.01em;
}
.seo-card p{color:var(--muted);font-size:.96rem;line-height:1.7}

/* CTA 居中按钮区 */
.seo-cta-wrap{text-align:center;margin-top:2.5rem}