*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
:root{
  --ink:#0c1222;--ink-80:#1e293b;--ink-60:#334155;--ink-40:#64748b;--ink-20:#94a3b8;--ink-10:#cbd5e1;--ink-05:#e2e8f0;--ink-02:#f1f5f9;--ink-01:#f8fafc;
  --sky:#0284c7;--sky-light:#0ea5e9;--sky-glow:rgba(14,165,233,0.08);--sky-border:rgba(2,132,199,0.15);
  --white:#ffffff;
  --nav-h:72px;
  --section-py:clamp(80px,10vw,140px);
  --container:1120px;
}

html{scroll-behavior:smooth;-webkit-font-smoothing:antialiased}
body{
  font-family:"SF Pro Display",-apple-system,BlinkMacSystemFont,"PingFang SC","Noto Sans SC","Microsoft YaHei",sans-serif;
  color:var(--ink-80);background:var(--white);line-height:1.7;
}

/* ─── Utility ─── */
.container{max-width:var(--container);margin:0 auto;padding:0 clamp(20px,4vw,48px)}
.section-label{
  display:inline-flex;align-items:center;gap:6px;
  font-size:12px;font-weight:700;letter-spacing:2.5px;text-transform:uppercase;
  color:var(--sky);margin-bottom:16px;
}
.section-label::before{content:'';display:block;width:24px;height:1.5px;background:var(--sky)}
.section-title{font-size:clamp(28px,4vw,42px);font-weight:800;color:var(--ink);line-height:1.2;letter-spacing:-0.5px;margin-bottom:20px}
.section-desc{font-size:17px;color:var(--ink-40);max-width:640px;line-height:1.8}

/* ─── Reveal Animation ─── */
@keyframes revealUp{from{opacity:0;transform:translateY(32px)}to{opacity:1;transform:translateY(0)}}
.reveal{opacity:0;animation:revealUp .7s cubic-bezier(.16,1,.3,1) forwards}
.reveal-d1{animation-delay:.1s}.reveal-d2{animation-delay:.2s}.reveal-d3{animation-delay:.3s}.reveal-d4{animation-delay:.4s}.reveal-d5{animation-delay:.5s}

/* ─── Navigation ─── */
nav{
  position:fixed;top:0;left:0;right:0;z-index:100;
  height:var(--nav-h);display:flex;align-items:center;
  background:rgba(255,255,255,0.85);backdrop-filter:blur(20px);
  border-bottom:1px solid transparent;transition:border-color .3s;
}
nav.scrolled{border-bottom-color:var(--ink-05)}
nav .container{display:flex;align-items:center;justify-content:space-between;width:100%}
.nav-brand{display:flex;align-items:center;gap:10px;text-decoration:none}
.nav-logo{
  width:36px;height:36px;border-radius:10px;
  background:linear-gradient(135deg,var(--sky),var(--sky-light));
  display:flex;align-items:center;justify-content:center;
}
.nav-logo svg{width:20px;height:20px;color:var(--white)}
.nav-name{font-size:17px;font-weight:800;color:var(--ink);letter-spacing:-.3px}
.nav-links{display:flex;gap:8px;align-items:center}
.nav-links a{
  font-size:14px;font-weight:600;color:var(--ink-40);text-decoration:none;
  padding:8px 16px;border-radius:8px;transition:all .2s;
}
.nav-links a:hover{color:var(--ink);background:var(--ink-02)}
.nav-cta{
  font-size:14px;font-weight:700;color:var(--white)!important;
  background:var(--sky)!important;padding:9px 20px!important;border-radius:8px!important;
  transition:all .2s!important;
}
.nav-cta:hover{background:var(--sky-light)!important;transform:translateY(-1px);box-shadow:0 4px 12px rgba(2,132,199,.25)}
.nav-toggle{display:none;background:none;border:none;cursor:pointer;padding:8px;color:var(--ink-60)}
.nav-toggle svg{width:24px;height:24px}

/* ─── Hero ─── */
.hero{
  padding-top:calc(var(--nav-h) + clamp(60px,8vw,120px));
  padding-bottom:var(--section-py);
  position:relative;overflow:hidden;
}
.hero::before{
  content:'';position:absolute;top:-200px;right:-200px;
  width:600px;height:600px;border-radius:50%;
  background:radial-gradient(circle,var(--sky-glow) 0%,transparent 70%);
  pointer-events:none;
}
.hero::after{
  content:'';position:absolute;bottom:-100px;left:-100px;
  width:400px;height:400px;border-radius:50%;
  background:radial-gradient(circle,rgba(2,132,199,0.04) 0%,transparent 70%);
  pointer-events:none;
}
.hero .container{position:relative;z-index:1}
.hero-badge{
  display:inline-flex;align-items:center;gap:8px;
  padding:6px 14px 6px 8px;border-radius:20px;
  background:var(--sky-glow);border:1px solid var(--sky-border);
  font-size:13px;font-weight:600;color:var(--sky);margin-bottom:28px;
}
.hero-badge-dot{width:8px;height:8px;border-radius:50%;background:var(--sky);animation:pulse 2s ease-in-out infinite}
@keyframes pulse{0%,100%{opacity:1}50%{opacity:.4}}
.hero h1{
  font-size:clamp(36px,5.5vw,64px);font-weight:900;color:var(--ink);
  line-height:1.1;letter-spacing:-1.5px;margin-bottom:24px;max-width:700px;
}
.hero h1 span{
  background:linear-gradient(135deg,var(--sky),var(--sky-light));
  -webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;
}
.hero-desc{font-size:18px;color:var(--ink-40);max-width:540px;line-height:1.8;margin-bottom:40px}
.hero-actions{display:flex;gap:12px;flex-wrap:wrap}
.btn-primary{
  display:inline-flex;align-items:center;gap:8px;
  padding:14px 28px;border-radius:12px;font-size:15px;font-weight:700;
  color:var(--white);background:var(--sky);text-decoration:none;
  transition:all .25s;border:none;cursor:pointer;
  box-shadow:0 2px 12px rgba(2,132,199,0.2);
}
.btn-primary:hover{background:var(--sky-light);transform:translateY(-2px);box-shadow:0 6px 20px rgba(2,132,199,0.3)}
.btn-primary svg{width:18px;height:18px}
.btn-secondary{
  display:inline-flex;align-items:center;gap:8px;
  padding:14px 28px;border-radius:12px;font-size:15px;font-weight:700;
  color:var(--ink-60);background:var(--ink-01);text-decoration:none;
  border:1.5px solid var(--ink-05);transition:all .25s;
}
.btn-secondary:hover{color:var(--ink);border-color:var(--ink-10);background:var(--ink-02)}
.btn-secondary svg{width:18px;height:18px}
.hero-stats{display:flex;gap:48px;margin-top:64px;padding-top:40px;border-top:1px solid var(--ink-05)}
.hero-stat-num{font-size:36px;font-weight:900;color:var(--ink);letter-spacing:-1px}
.hero-stat-label{font-size:13px;color:var(--ink-40);font-weight:500;margin-top:4px}

/* ─── Features ─── */
.features{padding:var(--section-py) 0;background:var(--ink-01)}
.features-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px;margin-top:48px}
.feature-card{
  padding:32px 28px;border-radius:16px;background:var(--white);
  border:1px solid var(--ink-05);transition:all .3s;
}
.feature-card:hover{border-color:var(--sky-border);box-shadow:0 8px 32px rgba(2,132,199,0.08);transform:translateY(-4px)}
.feature-icon{
  width:48px;height:48px;border-radius:12px;
  background:var(--sky-glow);border:1px solid var(--sky-border);
  display:flex;align-items:center;justify-content:center;margin-bottom:20px;
}
.feature-icon svg{width:22px;height:22px;color:var(--sky)}
.feature-card h3{font-size:17px;font-weight:700;color:var(--ink);margin-bottom:10px}
.feature-card p{font-size:14px;color:var(--ink-40);line-height:1.7}

/* ─── Products ─── */
.products{padding:var(--section-py) 0}
.products-grid{display:grid;grid-template-columns:1fr 1fr;gap:32px;margin-top:48px}
.product-card{
  position:relative;padding:48px 40px;border-radius:20px;overflow:hidden;
  border:1.5px solid var(--ink-05);transition:all .35s;
  background:var(--white);
}
.product-card:hover{border-color:var(--sky-border);box-shadow:0 12px 48px rgba(2,132,199,0.1)}
.product-card::before{
  content:'';position:absolute;top:0;right:0;width:200px;height:200px;
  background:radial-gradient(circle,var(--sky-glow) 0%,transparent 70%);
  pointer-events:none;
}
.product-badge{
  display:inline-flex;padding:4px 12px;border-radius:6px;font-size:12px;font-weight:700;
  background:var(--sky-glow);color:var(--sky);margin-bottom:20px;
}
.product-card h3{font-size:24px;font-weight:800;color:var(--ink);margin-bottom:8px;letter-spacing:-.3px}
.product-card .subtitle{font-size:14px;color:var(--ink-40);margin-bottom:20px}
.product-card p{font-size:15px;color:var(--ink-40);line-height:1.8;margin-bottom:28px}
.product-card .btn-primary{font-size:14px;padding:11px 22px}

/* ─── About ─── */
.about{padding:var(--section-py) 0;background:var(--ink-01)}
.about-content{display:grid;grid-template-columns:1fr 1fr;gap:64px;align-items:center;margin-top:48px}
.about-text p{font-size:16px;color:var(--ink-60);line-height:2;margin-bottom:24px}
.about-metrics{display:grid;grid-template-columns:1fr 1fr;gap:20px}
.about-metric{
  padding:24px;border-radius:14px;background:var(--white);
  border:1px solid var(--ink-05);text-align:center;
}
.about-metric-num{font-size:32px;font-weight:900;color:var(--sky);letter-spacing:-1px}
.about-metric-label{font-size:13px;color:var(--ink-40);margin-top:4px;font-weight:500}

/* ─── Contact ─── */
.contact{padding:var(--section-py) 0}
.contact-grid{display:grid;grid-template-columns:1fr 1fr;gap:64px;margin-top:48px}
.contact-info{display:flex;flex-direction:column;gap:24px}
.contact-item{display:flex;align-items:flex-start;gap:16px}
.contact-item-icon{
  width:44px;height:44px;border-radius:12px;flex-shrink:0;
  background:var(--sky-glow);border:1px solid var(--sky-border);
  display:flex;align-items:center;justify-content:center;
}
.contact-item-icon svg{width:20px;height:20px;color:var(--sky)}
.contact-item h4{font-size:14px;font-weight:700;color:var(--ink);margin-bottom:4px}
.contact-item p{font-size:14px;color:var(--ink-40)}
.contact-item a{color:var(--sky);text-decoration:none;font-weight:600}
.contact-item a:hover{text-decoration:underline}
.contact-form{display:flex;flex-direction:column;gap:16px}
.form-row{display:grid;grid-template-columns:1fr 1fr;gap:16px}
.form-input{
  width:100%;padding:13px 16px;border-radius:10px;border:1.5px solid var(--ink-05);
  background:var(--ink-01);font-size:14px;color:var(--ink);outline:none;
  transition:all .2s;font-family:inherit;resize:none;
}
.form-input:focus{border-color:var(--sky);background:var(--white);box-shadow:0 0 0 3px rgba(14,165,233,0.1)}
.form-input::placeholder{color:var(--ink-20)}

/* ─── Footer ─── */
footer{
  padding:48px 0;border-top:1px solid var(--ink-05);
  background:var(--ink-01);
}
.footer-inner{display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:16px}
.footer-brand{display:flex;align-items:center;gap:8px}
.footer-brand-logo{width:28px;height:28px;border-radius:8px;background:linear-gradient(135deg,var(--sky),var(--sky-light));display:flex;align-items:center;justify-content:center}
.footer-brand-logo svg{width:14px;height:14px;color:var(--white)}
.footer-brand span{font-size:14px;font-weight:700;color:var(--ink-60)}
.footer-copy{font-size:13px;color:var(--ink-20)}
.footer-links{display:flex;gap:24px}
.footer-links a{font-size:13px;color:var(--ink-40);text-decoration:none;transition:color .2s}
.footer-links a:hover{color:var(--sky)}


/* ─── Sub-page: page hero ─── */
.page-hero{
  padding-top:calc(var(--nav-h) + clamp(56px,7vw,96px));
  padding-bottom:clamp(48px,6vw,72px);
  background:var(--ink-01);border-bottom:1px solid var(--ink-05);
  position:relative;overflow:hidden;
}
.page-hero::before{
  content:'';position:absolute;top:-220px;right:-160px;
  width:520px;height:520px;border-radius:50%;
  background:radial-gradient(circle,var(--sky-glow) 0%,transparent 70%);
  pointer-events:none;
}
.page-hero .container{position:relative;z-index:1}
.page-hero h1{
  font-size:clamp(30px,4.4vw,48px);font-weight:900;color:var(--ink);
  line-height:1.15;letter-spacing:-1px;margin-bottom:16px;max-width:820px;
}
.page-hero p{font-size:17px;color:var(--ink-40);max-width:680px;line-height:1.85}
.breadcrumb{
  display:flex;align-items:center;gap:8px;
  font-size:13px;color:var(--ink-20);margin-bottom:20px;
}
.breadcrumb a{color:var(--ink-40);text-decoration:none}
.breadcrumb a:hover{color:var(--sky)}
.breadcrumb span{color:var(--ink-10)}

/* ─── Sub-page: generic section ─── */
.section{padding:var(--section-py) 0}
.section.alt{background:var(--ink-01)}

/* ─── Prose ─── */
.prose{max-width:820px}
.prose p{font-size:16px;color:var(--ink-60);line-height:2;margin-bottom:20px}
.prose h3{font-size:19px;font-weight:800;color:var(--ink);margin:32px 0 12px}
.prose ul{margin:0 0 20px 0;padding-left:0;list-style:none}
.prose ul li{
  position:relative;padding-left:24px;font-size:15px;color:var(--ink-60);
  line-height:1.9;
}
.prose ul li::before{
  content:'';position:absolute;left:4px;top:13px;
  width:6px;height:6px;border-radius:50%;background:var(--sky);
}

/* ─── Tables ─── */
.tbl-wrap{overflow-x:auto;margin:32px 0;border:1px solid var(--ink-05);border-radius:14px}
table.spec{width:100%;border-collapse:collapse;font-size:14px;background:var(--white)}
table.spec th,table.spec td{padding:14px 18px;text-align:left;border-bottom:1px solid var(--ink-05)}
table.spec th{
  font-weight:700;color:var(--ink);background:var(--ink-01);
  font-size:13px;letter-spacing:.3px;white-space:nowrap;
}
table.spec td{color:var(--ink-40)}
table.spec td strong{color:var(--ink);font-weight:700}
table.spec tr:last-child td{border-bottom:none}

/* ─── Pricing (shared with home) ─── */
.pricing-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px;margin-top:48px}
.tier{
  position:relative;text-align:center;padding:36px 24px;border-radius:16px;
  background:var(--white);border:1px solid var(--ink-05);transition:all .3s;
}
.tier:hover{border-color:var(--sky-border);box-shadow:0 8px 32px rgba(2,132,199,.08)}
.tier.featured{border-color:var(--sky);box-shadow:0 8px 40px rgba(2,132,199,.12)}
.tier-tag{
  position:absolute;top:-12px;left:50%;transform:translateX(-50%);
  background:var(--sky);color:#fff;font-size:12px;font-weight:700;
  padding:3px 14px;border-radius:12px;white-space:nowrap;
}
.tier h3{font-size:20px;font-weight:800;color:var(--ink);margin-bottom:4px}
.tier-sub{font-size:13px;color:var(--ink-20);margin-bottom:4px}
.tier-price{
  font-size:36px;font-weight:900;color:var(--ink);margin:16px 0;letter-spacing:-1px;
}
.tier-price .cur{font-size:18px;color:var(--ink-40);font-weight:700}
.tier-price .per{font-size:15px;color:var(--ink-40);font-weight:500}
.tier-quota{
  background:var(--ink-02);border-radius:8px;padding:10px;margin-bottom:20px;
}
.tier-quota .k{font-size:12px;color:var(--ink-40)}
.tier-quota .v{font-size:20px;font-weight:800;color:var(--ink)}
.tier ul{list-style:none;padding:0;text-align:left;font-size:14px;color:var(--ink-40)}
.tier ul li{padding:6px 0}
.tier .btn-primary,.tier .btn-secondary{
  width:100%;justify-content:center;margin-top:20px;font-size:14px;padding:11px;
}
.pay-note{text-align:center;margin-top:24px;font-size:13px;color:var(--ink-20)}

/* ─── Entry cards (home → sub pages) ─── */
.entry-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:24px;margin-top:40px}
.entry-card{
  display:block;padding:32px 30px;border-radius:16px;text-decoration:none;
  background:var(--white);border:1px solid var(--ink-05);transition:all .3s;
}
.entry-card:hover{border-color:var(--sky-border);box-shadow:0 8px 32px rgba(2,132,199,.08);transform:translateY(-3px)}
.entry-card h3{font-size:19px;font-weight:800;color:var(--ink);margin-bottom:8px}
.entry-card p{font-size:14px;color:var(--ink-40);line-height:1.75;margin-bottom:14px}
.entry-card .more{font-size:14px;font-weight:700;color:var(--sky);display:inline-flex;align-items:center;gap:6px}
.entry-card .more svg{width:16px;height:16px}

/* ─── CTA band ─── */
.cta-band{
  padding:clamp(56px,7vw,88px) 0;background:var(--ink-01);
  border-top:1px solid var(--ink-05);text-align:center;
}
.cta-band h2{font-size:clamp(24px,3.2vw,34px);font-weight:900;color:var(--ink);letter-spacing:-.7px;margin-bottom:14px}
.cta-band p{font-size:16px;color:var(--ink-40);max-width:560px;margin:0 auto 28px;line-height:1.8}
.cta-actions{display:flex;gap:12px;justify-content:center;flex-wrap:wrap}

/* ─── Contact detail ─── */
.contact-cards{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;margin-top:40px}
.contact-card{
  padding:28px 24px;border-radius:14px;background:var(--white);
  border:1px solid var(--ink-05);
}
.contact-card .feature-icon{margin-bottom:16px}
.contact-card h4{font-size:15px;font-weight:800;color:var(--ink);margin-bottom:6px}
.contact-card p{font-size:14px;color:var(--ink-40);line-height:1.8}
.contact-card a{color:var(--sky);text-decoration:none;font-weight:600}
.contact-card a:hover{text-decoration:underline}

@media(max-width:960px){
  .pricing-grid{grid-template-columns:1fr 1fr}
  .entry-grid,.contact-cards{grid-template-columns:1fr}
}
@media(max-width:640px){
  .pricing-grid{grid-template-columns:1fr}
}

/* ─── Responsive ─── */
@media(max-width:960px){
  .features-grid{grid-template-columns:1fr 1fr}
  .products-grid,.about-content,.contact-grid{grid-template-columns:1fr}
  .hero-stats{gap:32px}
}
@media(max-width:640px){
  .features-grid{grid-template-columns:1fr}
  .hero-stats{flex-direction:column;gap:20px}
  .hero-actions{flex-direction:column}
  .btn-primary,.btn-secondary{justify-content:center}
  .form-row{grid-template-columns:1fr}
  .nav-links{
    display:none;position:fixed;top:var(--nav-h);left:0;right:0;
    flex-direction:column;background:var(--white);padding:16px;gap:4px;
    border-bottom:1px solid var(--ink-05);box-shadow:0 8px 24px rgba(0,0,0,0.06);
  }
  .nav-links.open{display:flex}
  .nav-toggle{display:block}
  .about-metrics{grid-template-columns:1fr 1fr}
}