/* ============================================================
   GUANGZHOU HUHANG — minimal Western-style corporate theme
   No external fonts / icon libs. System stack for fast load.
   ============================================================ */

:root{
  --ink:#0a2540;
  --primary:#1b6ef3;
  --primary-700:#1457c9;
  --bg:#ffffff;
  --bg-alt:#f6f9fe;
  --text:#1f2a37;
  --muted:#5b6b7f;
  --border:#e4ebf3;
  --radius:14px;
  --radius-sm:10px;
  --shadow:0 8px 28px rgba(10,37,64,.08);
  --shadow-sm:0 2px 10px rgba(10,37,64,.06);
  --container:1160px;
  --font: -apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue",Arial,"PingFang SC","Microsoft YaHei",sans-serif;
}

*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{
  margin:0;
  font-family:var(--font);
  color:var(--text);
  background:var(--bg);
  line-height:1.6;
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
h1,h2,h3,h4,h5{margin:0;line-height:1.2;color:var(--ink);letter-spacing:-.01em}
p{margin:0}

.container{width:100%;max-width:var(--container);margin:0 auto;padding:0 24px}

/* ---------- Buttons ---------- */
.btn{
  display:inline-block;
  padding:12px 22px;
  border-radius:999px;
  font-weight:600;
  font-size:15px;
  cursor:pointer;
  border:1px solid transparent;
  transition:transform .15s ease,background .2s ease,box-shadow .2s ease;
}
.btn-primary{background:var(--primary);color:#fff;box-shadow:var(--shadow-sm)}
.btn-primary:hover{background:var(--primary-700);transform:translateY(-1px)}
.btn-ghost{background:transparent;color:var(--ink);border-color:var(--border)}
.btn-ghost:hover{border-color:var(--primary);color:var(--primary)}

/* ---------- Header / Nav ---------- */
.site-header{
  position:sticky;top:0;z-index:50;
  background:rgba(255,255,255,.82);
  backdrop-filter:saturate(160%) blur(10px);
  border-bottom:1px solid var(--border);
}
.site-header .container{padding-left:12px;padding-right:12px}
.nav{display:flex;align-items:center;gap:18px}
.brand{display:flex;align-items:center;gap:14px;text-decoration:none}
.brand-logo{height:64px;width:auto;max-height:64px;object-fit:contain;display:block}
.footer-brand .brand-logo{height:70px;max-height:70px}
.brand-text{display:flex;flex-direction:column;line-height:1.15;gap:3px}
.brand-text strong{font-size:16px;letter-spacing:0;color:var(--ink);font-weight:800;white-space:nowrap}
.brand-text small{font-size:13px;color:var(--muted);letter-spacing:.02em}
@media (max-width:560px){.brand-text{display:none}}

.nav-links{display:flex;gap:16px;flex-wrap:nowrap;margin-left:auto;padding:0}
.nav-links a{color:var(--muted);font-weight:500;font-size:13.5px;transition:color .15s;white-space:nowrap}
.nav-links a:hover{color:var(--primary)}
@media (max-width:1080px){.brand-text strong{font-size:17px}.brand-text small{font-size:13.5px}}

.nav-actions{display:flex;align-items:center;gap:12px}
.lang-toggle{
  border:1px solid var(--border);background:#fff;color:var(--ink);
  padding:7px 14px;border-radius:999px;font-weight:600;font-size:14px;cursor:pointer;
  transition:border-color .15s,color .15s;
}
.lang-toggle:hover{border-color:var(--primary);color:var(--primary)}

.menu-btn{display:none;flex-direction:column;gap:5px;background:none;border:0;cursor:pointer;padding:6px}
.menu-btn span{width:24px;height:2px;background:var(--ink);border-radius:2px;transition:.25s}
.menu-btn.open span:nth-child(1){transform:translateY(7px) rotate(45deg)}
.menu-btn.open span:nth-child(2){opacity:0}
.menu-btn.open span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}

/* ---------- Hero ---------- */
.hero{
  background:
    radial-gradient(900px 400px at 85% -10%, #e7f0ff 0%, rgba(231,240,255,0) 60%),
    linear-gradient(180deg,#fbfdff,#ffffff);
  padding:64px 0 36px;
}
.hero-grid{display:grid;grid-template-columns:1.1fr .9fr;gap:40px;align-items:center}
.eyebrow{
  text-transform:uppercase;letter-spacing:.14em;font-size:13px;font-weight:700;
  color:var(--primary);margin-bottom:14px;
}
.hero h1{font-size:clamp(2rem,4.6vw,3.3rem);margin-bottom:18px}
.lead{color:var(--muted);font-size:clamp(1rem,1.4vw,1.12rem);max-width:52ch}
.hero-cta{display:flex;gap:14px;margin-top:26px;flex-wrap:wrap}
.value-chips{list-style:none;display:flex;flex-wrap:wrap;gap:10px;padding:0;margin:28px 0 0}
.value-chips li{
  background:#fff;border:1px solid var(--border);color:var(--ink);
  padding:8px 14px;border-radius:999px;font-size:13.5px;font-weight:600;
  box-shadow:var(--shadow-sm);
}
.hero-visual{display:flex;justify-content:center}
.hero-svg{width:100%;max-width:420px;height:auto}

.stats{
  display:grid;grid-template-columns:repeat(4,1fr);gap:18px;
  margin-top:48px;padding-top:30px;border-top:1px solid var(--border);
}
.stat{display:flex;flex-direction:column}
.stat-num{font-size:clamp(1.6rem,3vw,2.2rem);font-weight:800;color:var(--ink)}
.stat-label{font-size:13.5px;color:var(--muted);margin-top:4px}

/* ---------- Sections ---------- */
.section{padding:84px 0}
.section-alt{background:var(--bg-alt)}
.section-title{font-size:clamp(1.6rem,3vw,2.3rem);margin-bottom:14px}
.section-lead{color:var(--muted);max-width:62ch;font-size:1.05rem}

/* About */
.about-cols{display:grid;grid-template-columns:1.1fr .9fr;gap:40px;margin-top:36px;align-items:start}
.about-text p{color:var(--muted);margin-bottom:14px}
.check-list{list-style:none;padding:0;margin:18px 0 0}
.check-list li{position:relative;padding-left:26px;margin-bottom:10px;color:var(--text)}
.check-list li::before{content:"✓";position:absolute;left:0;top:0;color:var(--primary);font-weight:800}

.values{display:grid;grid-template-columns:1fr 1fr;gap:14px}
.value-card{background:#fff;border:1px solid var(--border);border-radius:var(--radius);padding:18px;box-shadow:var(--shadow-sm)}
.value-ic{display:inline-flex;width:34px;height:34px;align-items:center;justify-content:center;
  background:#eaf1ff;color:var(--primary);border-radius:9px;font-size:16px;margin-bottom:8px}
.value-card h4{font-size:16px;margin-bottom:4px}
.value-card p{color:var(--muted);font-size:14px}

.team{margin-top:52px}
.team h3{font-size:1.3rem;margin-bottom:18px}
.team-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:16px}
.team-card{background:#fff;border:1px solid var(--border);border-radius:var(--radius);padding:18px;box-shadow:var(--shadow-sm)}
.team-card h4{font-size:15px;margin-bottom:6px;color:var(--ink)}
.team-card p{color:var(--muted);font-size:14px}

/* Cards grid (services + solutions) */
.card-grid{display:grid;gap:20px;margin-top:38px}
.svc-grid{grid-template-columns:repeat(4,1fr)}
.sol-grid{grid-template-columns:repeat(3,1fr)}
.card{
  background:#fff;border:1px solid var(--border);border-radius:var(--radius);
  padding:24px;box-shadow:var(--shadow-sm);transition:transform .18s ease,box-shadow .18s ease,border-color .18s;
}
.card:hover{transform:translateY(-4px);box-shadow:var(--shadow);border-color:#cfe0fb}
.card-ic{margin-bottom:14px;color:var(--primary)}
.card-ic svg{width:42px;height:42px;display:block;fill:none;stroke:currentColor;stroke-width:2.3;stroke-linecap:round;stroke-linejoin:round}
.card h3{font-size:1.15rem;margin-bottom:8px}
.card p{color:var(--muted);font-size:14.5px;margin-bottom:12px}
.dot-list{list-style:none;padding:0;margin:0}
.dot-list li{position:relative;padding-left:18px;font-size:14px;color:var(--text);margin-bottom:7px}
.dot-list li::before{content:"";position:absolute;left:0;top:9px;width:6px;height:6px;border-radius:50%;background:var(--primary)}
.sol-card h3{font-size:1.1rem;margin-bottom:8px}
.sol-card p{color:var(--muted);font-size:14.5px;margin:0}

/* ---------- Contact ---------- */
.contact-grid{display:grid;grid-template-columns:.85fr 1.15fr;gap:36px;margin-top:38px;align-items:start}
.contact-info .info-block{margin-bottom:22px}
.contact-info h4{font-size:13px;text-transform:uppercase;letter-spacing:.1em;color:var(--primary);margin-bottom:6px}
.contact-info p{color:var(--text);font-size:15px}
.contact-info a{color:var(--primary);font-weight:600}
.muted{color:var(--muted);font-weight:400}

.contact-form{background:#fff;border:1px solid var(--border);border-radius:var(--radius);padding:24px;box-shadow:var(--shadow-sm)}
.form-row{display:grid;grid-template-columns:1fr 1fr;gap:14px;margin-bottom:14px}
.field{display:flex;flex-direction:column;gap:6px;margin-bottom:14px}
.field span{font-size:13.5px;font-weight:600;color:var(--ink)}
.field input,.field textarea{
  font:inherit;padding:11px 13px;border:1px solid var(--border);border-radius:var(--radius-sm);
  background:#fcfdff;color:var(--text);transition:border-color .15s,box-shadow .15s;width:100%;
}
.field input:focus,.field textarea:focus{outline:none;border-color:var(--primary);box-shadow:0 0 0 3px rgba(27,110,243,.15)}
.field textarea{resize:vertical}
.form-actions{margin-top:4px}
.form-note{margin:12px 0 0;font-size:14px;min-height:20px;color:var(--primary-700);font-weight:600}
.form-note.error{color:#c0392b}

.process{margin-top:34px;padding:30px 28px;border:1px solid var(--border);border-radius:var(--radius);background:#fff;box-shadow:var(--shadow-sm)}
.process-title{font-size:1.15rem;margin-bottom:22px;color:var(--ink)}
.process-steps{list-style:none;margin:0;padding:0;display:grid;grid-template-columns:repeat(4,1fr);gap:22px;counter-reset:step}
.process-steps li{position:relative;padding-top:48px}
.process-steps li::before{
  counter-increment:step;content:counter(step);
  position:absolute;top:0;left:0;width:34px;height:34px;border-radius:50%;
  background:var(--primary);color:#fff;font-weight:800;font-size:15px;
  display:flex;align-items:center;justify-content:center;box-shadow:var(--shadow-sm);
}
.process-steps li::after{
  content:"";position:absolute;top:17px;left:42px;right:-22px;height:2px;background:var(--border);
}
.process-steps li:last-child::after{display:none}
.process-steps h4{font-size:15.5px;margin-bottom:6px;color:var(--ink)}
.process-steps p{color:var(--muted);font-size:14px;margin:0}
@media (max-width:860px){.process-steps{grid-template-columns:repeat(2,1fr);gap:26px 20px}.process-steps li::after{display:none}}
@media (max-width:560px){.process-steps{grid-template-columns:1fr}.process{padding:24px}}

/* ---------- Footer ---------- */
.site-footer{background:var(--ink);color:#cdd9ea;padding:56px 0 28px;margin-top:0}
.footer-grid{display:grid;grid-template-columns:1.6fr 1fr 1fr 1fr;gap:30px}
.footer-brand .brand{
  display:inline-flex;align-items:center;gap:14px;
  background:#fff;padding:14px 20px;border-radius:14px;
  box-shadow:0 8px 28px rgba(0,0,0,.18);
  transition:transform .15s ease,box-shadow .2s ease;
}
.footer-brand .brand:hover{transform:translateY(-1px);box-shadow:0 12px 32px rgba(0,0,0,.22)}
.footer-brand .brand-text strong{color:var(--ink);white-space:normal;font-size:14px}
.footer-brand .brand-text small{color:#5a6a7a}
.footer-tag{color:#9fb2cc;font-size:14px;margin-top:18px;max-width:34ch}
.footer-col h5{color:#fff;font-size:13px;text-transform:uppercase;letter-spacing:.1em;margin-bottom:14px}
.footer-col a{display:block;color:#cdd9ea;font-size:14.5px;margin-bottom:10px;transition:color .15s}
.footer-col a:hover{color:#fff}
.footer-bottom{
  display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:10px;
  margin-top:40px;padding-top:22px;border-top:1px solid rgba(255,255,255,.12);
  color:#9fb2cc;font-size:13.5px;
}
.to-top{color:#9fb2cc}
.to-top:hover{color:#fff}

/* ---------- Reveal animation ---------- */
.reveal{opacity:0;transform:translateY(18px);transition:opacity .6s ease,transform .6s ease}
.reveal.in{opacity:1;transform:none}

/* ---------- Responsive ---------- */
@media (max-width:980px){
  .svc-grid{grid-template-columns:repeat(2,1fr)}
  .team-grid{grid-template-columns:repeat(2,1fr)}
}
@media (max-width:1080px){
  .menu-btn{display:flex}
  .nav-links{
    position:absolute;top:64px;left:0;right:0;padding:0;margin-left:0;
    flex-direction:column;gap:0;background:#fff;border-bottom:1px solid var(--border);
    max-height:0;overflow:hidden;transition:max-height .28s ease;box-shadow:var(--shadow);
  }
  .nav-links.open{max-height:340px}
  .nav-links a{padding:14px 24px;border-top:1px solid var(--border);color:var(--ink)}
}
@media (max-width:860px){
  .hero-grid{grid-template-columns:1fr;gap:24px}
  .hero-visual{order:-1}
  .stats{grid-template-columns:repeat(2,1fr);gap:22px}
  .about-cols{grid-template-columns:1fr;gap:28px}
  .contact-grid{grid-template-columns:1fr;gap:26px}
  .footer-grid{grid-template-columns:1fr 1fr}
  .section{padding:60px 0}
}
@media (max-width:560px){
  .svc-grid,.sol-grid,.team-grid{grid-template-columns:1fr}
  .form-row{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr}
  .hero{padding:44px 0 28px}
}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  .reveal{opacity:1;transform:none;transition:none}
  .btn:hover,.card:hover{transform:none}
}