:root{
  --brand:#F4511E;
  --brand-2:#FF8A3D;
  --ink:#17181C;
  --muted:#6B7280;
  --soft:#FFF7F3;
  --line:#ECECEC;
  --max:1080px;
}
*{box-sizing:border-box;margin:0;padding:0}
html{-webkit-text-size-adjust:100%}
body{
  font-family:system-ui,-apple-system,"PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  color:var(--ink);background:#fff;line-height:1.75;
  -webkit-font-smoothing:antialiased;
}
a{color:inherit;text-decoration:none}
.wrap{max-width:var(--max);margin:0 auto;padding:0 24px}

/* header */
header{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.86);backdrop-filter:blur(12px);border-bottom:1px solid var(--line)}
.nav{display:flex;align-items:center;justify-content:space-between;height:64px}
.logo{display:flex;align-items:center;gap:10px;font-weight:700;font-size:17px;letter-spacing:.2px}
.logo i{
  width:30px;height:30px;border-radius:9px;display:grid;place-items:center;
  background:linear-gradient(135deg,var(--brand),var(--brand-2));
  color:#fff;font-style:normal;font-size:15px;font-weight:800;
}
.nav-links{display:flex;gap:26px;font-size:14px;color:var(--muted)}
.nav-links a:hover{color:var(--brand)}

/* hero */
.hero{padding:76px 0 64px;background:
  radial-gradient(900px 380px at 78% -8%,#FFEDE4 0%,rgba(255,237,228,0) 62%),
  linear-gradient(180deg,#fff 0%,var(--soft) 100%);
  border-bottom:1px solid var(--line)}
.hero .wrap{display:grid;grid-template-columns:1.15fr .85fr;gap:56px;align-items:center}
.tag{display:inline-block;font-size:12.5px;color:var(--brand);background:#FFEDE4;border:1px solid #FFD9C7;border-radius:999px;padding:4px 12px;margin-bottom:20px;font-weight:600}
.hero h1{font-size:44px;line-height:1.24;letter-spacing:-.5px;font-weight:800}
.hero h1 em{font-style:normal;background:linear-gradient(120deg,var(--brand),var(--brand-2));-webkit-background-clip:text;background-clip:text;color:transparent}
.hero p{margin-top:20px;font-size:16.5px;color:#4B5563;max-width:520px}
.hero .cta{margin-top:32px;display:flex;gap:12px;flex-wrap:wrap}
.btn{display:inline-flex;align-items:center;gap:8px;height:46px;padding:0 24px;border-radius:12px;font-size:15px;font-weight:600;transition:.18s}
.btn-primary{background:linear-gradient(135deg,var(--brand),var(--brand-2));color:#fff;box-shadow:0 8px 20px rgba(244,81,30,.24)}
.btn-primary:hover{transform:translateY(-1px);box-shadow:0 12px 26px rgba(244,81,30,.3)}
.btn-ghost{background:#fff;border:1px solid var(--line);color:#374151}
.btn-ghost:hover{border-color:#D9D9D9}

/* phone mock */
.mock{
  aspect-ratio:9/17;max-width:280px;margin:0 auto;border-radius:30px;
  background:#fff;border:1px solid var(--line);
  box-shadow:0 24px 60px rgba(23,24,28,.12),0 2px 8px rgba(23,24,28,.04);
  padding:14px 12px;display:flex;flex-direction:column;gap:10px;overflow:hidden
}
.mock-bar{height:5px;width:54px;border-radius:99px;background:#E9E9E9;margin:2px auto 6px}
.mock-item{border:1px solid var(--line);border-radius:12px;padding:10px 11px;display:flex;gap:10px;align-items:center}
.mock-thumb{width:44px;height:44px;border-radius:9px;background:linear-gradient(135deg,#FFE3D4,#FFD0B8);flex:none}
.mock-line{height:7px;border-radius:4px;background:#F0F0F0}
.mock-line.s{width:62%;margin-top:6px}
.mock-price{font-size:12px;color:var(--brand);font-weight:700;margin-top:5px}
.mock-item:nth-child(3) .mock-thumb{background:linear-gradient(135deg,#E3F0FF,#C9E0FF)}
.mock-item:nth-child(4) .mock-thumb{background:linear-gradient(135deg,#E6F7EC,#CFEEDB)}

/* sections */
section.block{padding:72px 0}
section.block.alt{background:var(--soft);border-top:1px solid var(--line);border-bottom:1px solid var(--line)}
.sec-head{text-align:center;max-width:620px;margin:0 auto 44px}
.sec-head h2{font-size:29px;font-weight:800;letter-spacing:-.3px}
.sec-head p{margin-top:12px;color:var(--muted);font-size:15.5px}
.grid{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.card{background:#fff;border:1px solid var(--line);border-radius:16px;padding:26px 24px;transition:.2s}
.card:hover{border-color:#FFD9C7;box-shadow:0 10px 30px rgba(244,81,30,.08);transform:translateY(-2px)}
.card .ico{width:40px;height:40px;border-radius:11px;display:grid;place-items:center;background:#FFEDE4;color:var(--brand);font-size:19px;margin-bottom:16px}
.card h3{font-size:16.5px;font-weight:700;margin-bottom:8px}
.card p{font-size:14.5px;color:var(--muted);line-height:1.7}

/* steps */
.steps{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;counter-reset:s}
.step{position:relative;padding:26px 22px 24px;background:#fff;border:1px solid var(--line);border-radius:16px}
.step::before{counter-increment:s;content:counter(s);position:absolute;top:-14px;left:22px;width:28px;height:28px;border-radius:9px;background:linear-gradient(135deg,var(--brand),var(--brand-2));color:#fff;font-size:14px;font-weight:700;display:grid;place-items:center}
.step h4{font-size:15.5px;font-weight:700;margin-bottom:7px;margin-top:4px}
.step p{font-size:14px;color:var(--muted)}

/* notice */
.notice{background:#fff;border:1px solid var(--line);border-left:3px solid var(--brand);border-radius:12px;padding:22px 24px;font-size:14px;color:#4B5563;line-height:1.85}
.notice b{color:var(--ink)}

/* prose (隐私政策/协议) */
.prose{max-width:800px;margin:0 auto;padding:56px 0 72px}
.prose h1{font-size:30px;font-weight:800;letter-spacing:-.3px;margin-bottom:10px}
.prose .meta{color:var(--muted);font-size:13.5px;padding-bottom:24px;border-bottom:1px solid var(--line);margin-bottom:32px}
.prose h2{font-size:18.5px;font-weight:700;margin:34px 0 12px;padding-left:12px;border-left:3px solid var(--brand)}
.prose h3{font-size:15.5px;font-weight:700;margin:22px 0 8px;color:#374151}
.prose p{font-size:15px;color:#3F4650;margin-bottom:12px}
.prose ul{margin:8px 0 14px 20px}
.prose li{font-size:15px;color:#3F4650;margin-bottom:7px}
.prose strong{color:var(--ink);font-weight:600}
.prose table{width:100%;border-collapse:collapse;margin:14px 0 18px;font-size:14px}
.prose th,.prose td{border:1px solid var(--line);padding:10px 12px;text-align:left;vertical-align:top}
.prose th{background:var(--soft);font-weight:600;color:#374151}
.prose .tip{background:var(--soft);border-radius:10px;padding:14px 16px;font-size:14px;color:#4B5563;margin:16px 0}

/* footer */
footer{background:#17181C;color:#9CA3AF;padding:52px 0 36px;font-size:13.5px}
footer .cols{display:grid;grid-template-columns:1.4fr 1fr 1fr;gap:40px;padding-bottom:32px;border-bottom:1px solid #26272C}
footer .brand{color:#fff;font-weight:700;font-size:16px;margin-bottom:12px;display:flex;align-items:center;gap:10px}
footer a:hover{color:#fff}
footer .links{display:flex;flex-direction:column;gap:10px}
footer h5{color:#fff;font-size:13.5px;font-weight:600;margin-bottom:14px}
footer .bottom{padding-top:26px;display:flex;justify-content:space-between;gap:16px;flex-wrap:wrap;line-height:2}
footer .bottom a{color:#9CA3AF}

@media (max-width:860px){
  .hero{padding:52px 0 44px}
  .hero .wrap{grid-template-columns:1fr;gap:36px}
  .hero h1{font-size:32px}
  .mock{max-width:240px}
  .grid,.steps{grid-template-columns:1fr}
  section.block{padding:52px 0}
  .sec-head h2{font-size:23px}
  .nav-links{gap:16px;font-size:13px}
  footer .cols{grid-template-columns:1fr;gap:26px}
  .prose{padding:36px 0 56px}
  .prose h1{font-size:24px}
}