:root{
  --brand:#0a7f77;
  --brand-600:#0c8f85;
  --brand-700:#087169;
  --ink:#0b1f1e;
  --muted:#5f7f7c;
  --bg:#f6fbfb;
  --white:#ffffff;
}
*{box-sizing:border-box}
html,body{margin:0;padding:0}
body{
  font-family:Inter,system-ui,-apple-system,Segoe UI,Roboto,Helvetica,Arial,"PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  color:var(--ink);
  background:
    radial-gradient(1200px 600px at 10% -10%, rgba(18,178,167,.15), transparent 60%),
    radial-gradient(1000px 500px at 110% 20%, rgba(10,127,119,.12), transparent 60%),
    var(--bg);
  line-height:1.6
}

/* Subtle animated background glow */
body::before{
  content:"";
  position:fixed;
  inset:-20% -10% -20% -10%;
  pointer-events:none;
  z-index:-1;
  background:
    radial-gradient(700px 480px at 15% 10%, rgba(18,178,167,.18), transparent 65%),
    radial-gradient(800px 520px at 85% 25%, rgba(10,127,119,.14), transparent 60%);
  animation:bgFloat 28s ease-in-out infinite alternate, brandBreath 12s ease-in-out infinite;
}

@keyframes bgFloat{
  0%{transform:translate3d(0,0,0) scale(1)}
  50%{transform:translate3d(0,-1.2%,0) scale(1.015)}
  100%{transform:translate3d(0,1.2%,0) scale(1.03)}
}
.container{width:min(1120px,92%);margin:0 auto}

/* Header */
.site-header{position:sticky;top:0;background:rgba(246,251,251,.8);backdrop-filter:saturate(180%) blur(8px);border-bottom:1px solid #e6efee;z-index:20}
.header-inner{display:flex;align-items:center;justify-content:space-between;padding:14px 0}
.brand{display:flex;align-items:center;gap:10px}
.brand .logo{height:28px}
.brand-name{font-weight:800;letter-spacing:.2px;display:none}
.nav{display:flex;gap:18px;align-items:center}
.nav a{color:var(--ink);text-decoration:none;font-weight:600}
.nav .btn-sm{padding:8px 12px;border-radius:10px;background:var(--brand);color:#fff}
.nav-toggle{display:none;border:1px solid #d3e7e4;background:#fff;border-radius:10px;padding:8px 10px;font-size:18px;cursor:pointer}
.mobile-menu{position:fixed;inset:0;z-index:19;pointer-events:none}
.mobile-menu .mm-backdrop{position:absolute;inset:0;background:rgba(0,0,0,.06);opacity:0;transition:opacity .2s ease}
.mobile-menu .mm-drawer{position:absolute;top:56px;left:0;right:0;width:auto;max-width:560px;margin:8px auto;background:#fff;border:1px solid #e5eeed;border-radius:14px;box-shadow:0 12px 28px rgba(16,24,40,.12);transform:translateY(-12px);transition:transform .22s ease, opacity .22s ease;opacity:0}
.mobile-menu nav{display:grid;grid-template-columns:1fr 1fr;gap:8px 10px;padding:14px}
.mobile-menu a{position:relative;display:flex;align-items:center;justify-content:center;gap:8px;padding:12px;border-radius:12px;text-decoration:none;color:var(--ink);font-weight:700;background:linear-gradient(180deg,#f8fbfb 0%,#eef5f4 100%);text-align:center;box-shadow:inset 0 1px 0 rgba(255,255,255,.7)}
.mobile-menu a:hover{background:linear-gradient(180deg,#f4f9f8 0%,#e6f0ef 100%)}
.mobile-menu a:active{transform:translateY(1px)}
.mobile-menu a.btn{background:linear-gradient(180deg,var(--brand) 0%, var(--brand-600) 100%);color:#fff;box-shadow:inset 0 1px 0 rgba(255,255,255,.3), 0 6px 16px rgba(10,127,119,.18)}
.mobile-menu a.btn:hover{filter:brightness(1.03)}
.mobile-menu a:hover{background:#e9f2f1}
.mobile-menu .mm-group-title{grid-column:1/-1;font-size:12px;color:#6b8b88;margin:4px 2px 0}
.mi{width:18px;height:18px;border-radius:4px;background:var(--brand);display:inline-block;box-shadow:inset 0 0 0 2px rgba(255,255,255,.6)}
.mi.mi-about{background:linear-gradient(135deg,var(--brand) 0%, var(--brand-600) 100%)}
.mi.mi-feat{background:linear-gradient(135deg,#ffa94d,#ff6b6b)}
.mi.mi-flow{background:linear-gradient(135deg,#74c0fc,#4dabf7)}
.mi.mi-qr{background:linear-gradient(135deg,#51cf66,#2f9e44)}
.mobile-menu.open{pointer-events:auto}
.mobile-menu.open .mm-backdrop{opacity:1}
.mobile-menu.open .mm-drawer{transform:translateY(0);opacity:1}

/* Hero */
.hero{position:relative;overflow:hidden;min-height:72vh;display:flex;align-items:center}
.hero-inner{padding:96px 0 120px; text-align:left; display:grid; grid-template-columns:1.1fr .9fr; gap:24px; align-items:center}
.hero-left{min-width:0}
.hero-right{display:flex;align-items:center;justify-content:flex-end}
.hero-illus{width:100%;max-width:520px;height:auto;transition:transform 0.3s ease-out}
.hero-illus.ph{display:flex;align-items:center;justify-content:center;height:360px;color:var(--muted);font-weight:600}
.hero h1{font-size:48px;line-height:1.15;margin:0 0 12px}
.subtitle{font-size:18px;color:var(--muted);margin:0 0 24px}
.hero-actions{display:flex;gap:12px}
.hero-bg-gradient{position:absolute;inset:-10% -10% -30% -10%;z-index:-1;
  background:
    radial-gradient(1200px 700px at 15% 10%, #12b2a7 0%, rgba(18,178,167,0.45) 30%, rgba(10,127,119,0.15) 55%, transparent 70%),
    radial-gradient(900px 600px at 90% 0%, rgba(10,127,119,0.25), transparent 70%),
    linear-gradient(180deg, #e9fbfa 0%, transparent 50%);
  animation:heroGlow 22s ease-in-out infinite alternate;
}

@keyframes heroGlow{
  0%{filter:hue-rotate(0deg) brightness(1); transform:translateY(0)}
  100%{filter:hue-rotate(-6deg) brightness(1.05); transform:translateY(-0.8%)}
}

/* Decorative blobs */
.hero::after{content:"";position:absolute;right:-120px;top:-80px;width:360px;height:360px;border-radius:50%;filter:blur(40px);background:radial-gradient(circle at 40% 40%, rgba(255,255,255,.8), rgba(255,255,255,0) 60%)}

/* Sections */
.section{padding:80px 0}
.section-alt{background:#ffffff}
.section h2{font-size:32px;margin:0 0 24px}
.section-note{margin-top:14px;color:var(--muted)}
.grid-2{display:grid;grid-template-columns:1.1fr .9fr;gap:40px;align-items:center}
.illustration{background:linear-gradient(135deg,#f4fffe 0%,#e9fbfa 100%);border:1px solid #e5eeed;border-radius:16px;min-height:280px;display:flex;align-items:center;justify-content:center;box-shadow:0 6px 24px rgba(10,127,119,.08)}
.illustration img{width:100%;max-width:520px;border-radius:12px;display:block}
.illustration .ph{color:var(--muted);font-weight:600}

/* Features */
.features{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.feature-card{background:#fff;border:1px solid #e5eeed;border-radius:14px;padding:20px;box-shadow:0 4px 16px rgba(10,127,119,.08)}
.feature-card h3{margin:0 0 8px}

/* Steps */
.steps{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
.step{background:linear-gradient(180deg,#ffffff 0%,#f6fbfb 100%);border:1px solid #e5eeed;border-radius:14px;padding:20px}
.step-icon{width:36px;height:36px;border-radius:50%;display:flex;align-items:center;justify-content:center;background:var(--brand);color:#fff;font-weight:700;margin-bottom:8px}

/* CTA */
.cta{background:linear-gradient(135deg,var(--brand) 0%, var(--brand-600) 50%, var(--brand-700) 100%);color:#fff}
.cta-inner{display:flex;flex-direction:column;align-items:center;text-align:center}
.cta .hint{opacity:.9}
.qrcode-static{display:flex;align-items:center;justify-content:center}
.qrcode-static img{width:172px;height:172px;border-radius:12px;background:#fff;padding:8px;margin-top:10px;box-shadow:0 8px 24px rgba(0,0,0,.12)}
.qr-fallback{width:172px;height:172px;border-radius:12px;background:#fff;padding:8px;margin-top:10px;display:flex;align-items:center;justify-content:center;color:var(--muted);font-weight:700;border:1px dashed #cfe8e5}

/* Footer */
.site-footer{background:#0c2a28;color:#e9f4f3}
.footer-inner{padding:28px 0;display:grid;grid-template-columns:1fr 1fr;gap:16px;align-items:center}
.footer-links{display:flex;flex-wrap:wrap;gap:14px}
.footer-links a{color:#e9f4f3;text-decoration:none}
.footer-copy{grid-column:1/-1;opacity:.8}

/* Lists */
.list-check{padding-left:18px}
.list-check li{margin:8px 0}

/* Buttons */
.btn{border:0;cursor:pointer;border-radius:12px;font-weight:700}
.btn-primary{background:#0a7f77;color:#fff;padding:14px 18px}
.btn-secondary{background:#fff;color:var(--brand);padding:14px 18px}

/* Modal */
.modal{position:fixed;inset:0;display:none}
.modal[aria-hidden="false"]{display:block}
.modal-backdrop{position:absolute;inset:0;background:rgba(0,0,0,.38)}
.modal-dialog{position:relative;z-index:1;width:min(92%,440px);margin:8vh auto;background:#fff;border-radius:16px;padding:20px;text-align:center}
.modal-close{position:absolute;top:8px;right:10px;border:0;background:transparent;font-size:24px;cursor:pointer}
.modal-qr{width:240px;height:240px;border-radius:12px;background:#fff;margin:8px auto;box-shadow:0 8px 24px rgba(0,0,0,.12)}
.modal .qr-fallback{width:240px;height:240px;border-radius:12px;background:#fff;margin:8px auto;display:flex;align-items:center;justify-content:center;color:var(--muted);font-weight:700;border:1px dashed #cfe8e5}
.modal-title{margin:4px 0 8px}
.modal-tip{color:var(--muted)}

/* Responsive */
@media (max-width: 980px){
  .hero h1{font-size:42px}
}
@media (max-width: 860px){
  .nav{display:none}
  .nav-toggle{display:block}
  .grid-2{grid-template-columns:1fr}
  .hero-inner{grid-template-columns:1fr}
  .hero-right{display:none}
  .features,.steps{grid-template-columns:1fr}
  .hero{min-height:60vh}
  .hero h1{font-size:34px}
  .subtitle{font-size:16px}
  .footer-inner{grid-template-columns:1fr}
}
/* Respect reduced motion preferences */
@media (prefers-reduced-motion: reduce){
  body::before{animation:none}
  .hero-bg-gradient{animation:none}
}
@media (max-width: 420px){
  .btn-primary,.btn-secondary{width:100%}
}