/* ============ Xinyada Industrial — Global Stylesheet ============ */
:root{
  --brand:#0d3b66;
  --brand-dark:#082848;
  --accent:#f4a261;
  --accent-dark:#e76f51;
  --text:#1f2937;
  --muted:#6b7280;
  --bg:#ffffff;
  --bg-soft:#f6f8fb;
  --border:#e5e7eb;
  --shadow:0 6px 24px rgba(13,59,102,.08);
  --radius:10px;
  --maxw:1200px;
  --header-h:72px;
}

*{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{
  font-family:'Inter','Segoe UI','Helvetica Neue','PingFang SC','Microsoft YaHei',sans-serif;
  color:var(--text);
  background:var(--bg);
  line-height:1.6;
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block}
a{color:var(--brand);text-decoration:none}
a:hover{color:var(--accent-dark)}

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

/* ============ i18n language toggle ============ */
body.lang-en .lang-zh{display:none}
body.lang-zh .lang-en{display:none}
.lang-switch{
  display:inline-flex;align-items:center;border:1px solid var(--border);
  border-radius:999px;overflow:hidden;font-size:13px;background:#fff;
}
.lang-switch button{
  border:none;background:transparent;padding:6px 12px;cursor:pointer;color:var(--muted);font-weight:600;
}
.lang-switch button.active{background:var(--brand);color:#fff}

/* ============ Header / Nav ============ */
.site-header{
  position:sticky;top:0;z-index:50;
  background:rgba(255,255,255,.95);
  backdrop-filter:saturate(180%) blur(8px);
  border-bottom:1px solid var(--border);
}
.nav{
  height:var(--header-h);
  display:flex;align-items:center;justify-content:space-between;
}
.logo{display:flex;align-items:center;gap:10px;font-weight:700;color:var(--brand);font-size:20px}
.logo-mark{
  width:36px;height:36px;border-radius:8px;
  background:linear-gradient(135deg,var(--brand),var(--accent));
  display:grid;place-items:center;color:#fff;font-weight:800;
}
.nav-links{display:flex;gap:28px;list-style:none}
.nav-links a{color:var(--text);font-weight:500;font-size:15px;position:relative;padding:6px 0}
.nav-links a.active,.nav-links a:hover{color:var(--brand)}
.nav-links a.active::after{
  content:"";position:absolute;left:0;right:0;bottom:-4px;height:2px;background:var(--accent);
}
.nav-cta{display:flex;align-items:center;gap:14px}
.lang{font-size:13px;color:var(--muted)}
.btn{
  display:inline-block;padding:10px 18px;border-radius:8px;font-weight:600;font-size:14px;
  transition:transform .15s ease, box-shadow .15s ease, background .15s ease;
  cursor:pointer;border:none;
}
.btn-primary{background:var(--brand);color:#fff}
.btn-primary:hover{background:var(--brand-dark);color:#fff;transform:translateY(-1px)}
.btn-accent{background:var(--accent);color:#1a1a1a}
.btn-accent:hover{background:var(--accent-dark);color:#fff}
.btn-outline{border:1.5px solid var(--brand);color:var(--brand);background:transparent}
.btn-outline:hover{background:var(--brand);color:#fff}
.menu-toggle{display:none;border:none;background:transparent;font-size:24px;cursor:pointer;color:var(--brand)}

/* ============ Hero ============ */
.hero{
  position:relative;color:#fff;
  background:
    linear-gradient(120deg,rgba(8,40,72,.92),rgba(13,59,102,.78)),
    url("../assets/hero.svg") center/cover no-repeat;
  padding:90px 0 110px;
}
.hero h1{font-size:clamp(28px,4vw,48px);font-weight:800;line-height:1.2;margin-bottom:18px;max-width:760px}
.hero .lead{font-size:clamp(15px,1.6vw,18px);color:#e7eef7;max-width:680px;margin-bottom:28px}
.hero-actions{display:flex;flex-wrap:wrap;gap:14px}
.kpis{
  display:grid;grid-template-columns:repeat(4,1fr);gap:24px;
  max-width:var(--maxw);margin:-50px auto 0;padding:0 24px;
  position:relative;z-index:2;
}
.kpi{
  background:#fff;border-radius:var(--radius);box-shadow:var(--shadow);
  padding:22px 20px;text-align:center;
}
.kpi .num{color:var(--brand);font-size:28px;font-weight:800}
.kpi .lbl{color:var(--muted);font-size:13px;margin-top:4px}

/* ============ Sections ============ */
section{padding:80px 0}
.section-title{text-align:center;margin-bottom:48px}
.section-title .eyebrow{color:var(--accent-dark);font-weight:600;font-size:13px;letter-spacing:.12em;text-transform:uppercase}
.section-title h2{font-size:clamp(24px,3vw,34px);margin-top:8px;color:var(--brand-dark)}
.section-title p{color:var(--muted);max-width:680px;margin:12px auto 0}

.bg-soft{background:var(--bg-soft)}

/* ============ Cards / Grid ============ */
.grid{display:grid;gap:24px}
.grid-3{grid-template-columns:repeat(3,1fr)}
.grid-4{grid-template-columns:repeat(4,1fr)}
.card{
  background:#fff;border:1px solid var(--border);border-radius:var(--radius);
  overflow:hidden;transition:transform .2s ease, box-shadow .2s ease;
}
.card:hover{transform:translateY(-4px);box-shadow:var(--shadow)}
.card .thumb{aspect-ratio:4/3;background:#eef2f7;display:grid;place-items:center;color:#a3b3c7;font-size:14px;overflow:hidden}
.card .thumb svg{width:100%;height:100%}
.card .body{padding:20px}
.card h3{font-size:17px;color:var(--brand-dark);margin-bottom:8px}
.card p{color:var(--muted);font-size:14px;margin-bottom:14px}
.card .more{font-weight:600;font-size:14px;color:var(--brand)}
.card .more::after{content:" →";transition:margin .2s}
.card:hover .more::after{margin-left:6px}

/* features */
.feature{display:flex;gap:14px;align-items:flex-start}
.feature .ico{
  width:46px;height:46px;flex:0 0 46px;border-radius:10px;
  background:linear-gradient(135deg,var(--brand),#1d5b96);color:#fff;
  display:grid;place-items:center;font-size:20px;
}
.feature h3{font-size:17px;color:var(--brand-dark);margin-bottom:6px}
.feature p{color:var(--muted);font-size:14px}

/* ============ About Page ============ */
.about-grid{display:grid;grid-template-columns:1.1fr .9fr;gap:48px;align-items:center}
.about-grid h2{font-size:30px;color:var(--brand-dark);margin-bottom:16px}
.about-grid p{color:var(--muted);margin-bottom:14px}
.about-img{aspect-ratio:5/4;background:#eef2f7;border-radius:var(--radius);overflow:hidden}
.timeline{display:grid;gap:20px;max-width:780px;margin:0 auto}
.timeline .item{
  background:#fff;border:1px solid var(--border);border-radius:var(--radius);
  padding:20px;display:grid;grid-template-columns:120px 1fr;gap:18px;
}
.timeline .yr{color:var(--accent-dark);font-weight:800;font-size:20px}

/* certs */
.certs{display:grid;grid-template-columns:repeat(4,1fr);gap:18px}
.cert{
  aspect-ratio:3/4;background:#fff;border:1px dashed var(--border);
  border-radius:var(--radius);display:grid;place-items:center;color:var(--muted);font-size:13px;text-align:center;padding:14px;
}

/* ============ Products Page ============ */
.cat-bar{display:flex;flex-wrap:wrap;gap:10px;justify-content:center;margin-bottom:32px}
.cat-bar button{
  border:1px solid var(--border);background:#fff;color:var(--text);
  padding:8px 16px;border-radius:999px;font-size:14px;cursor:pointer;transition:.15s;
}
.cat-bar button.active,.cat-bar button:hover{
  background:var(--brand);border-color:var(--brand);color:#fff;
}
.spec-table{width:100%;border-collapse:collapse;margin-top:16px;font-size:14px}
.spec-table th,.spec-table td{padding:10px 12px;border:1px solid var(--border);text-align:left}
.spec-table th{background:var(--bg-soft);color:var(--brand-dark);font-weight:600}

/* ============ Contact Page ============ */
.contact-grid{display:grid;grid-template-columns:1fr 1.2fr;gap:40px}
.info-list{display:grid;gap:20px}
.info-item{
  display:flex;gap:14px;align-items:flex-start;background:#fff;
  border:1px solid var(--border);border-radius:var(--radius);padding:18px;
}
.info-item .ico{width:40px;height:40px;border-radius:8px;background:var(--bg-soft);color:var(--brand);display:grid;place-items:center;font-size:18px}
.info-item h4{font-size:15px;margin-bottom:4px;color:var(--brand-dark)}
.info-item p{color:var(--muted);font-size:14px}
.form-card{background:#fff;border:1px solid var(--border);border-radius:var(--radius);padding:28px;box-shadow:var(--shadow)}
.form-row{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin-bottom:16px}
.field label{display:block;font-size:13px;color:var(--text);font-weight:600;margin-bottom:6px}
.field input,.field textarea,.field select{
  width:100%;padding:11px 13px;border:1px solid var(--border);border-radius:8px;
  font-size:14px;font-family:inherit;background:#fff;outline:none;transition:.15s;
}
.field input:focus,.field textarea:focus,.field select:focus{border-color:var(--brand);box-shadow:0 0 0 3px rgba(13,59,102,.12)}
.field textarea{min-height:130px;resize:vertical}
.form-note{font-size:12px;color:var(--muted);margin-top:10px}
.form-success{display:none;margin-top:16px;padding:14px;background:#e8f7ef;color:#1f7a3b;border:1px solid #bfe6cc;border-radius:8px;font-size:14px}

/* ============ CTA banner ============ */
.cta-banner{
  background:linear-gradient(120deg,var(--brand),var(--brand-dark));
  color:#fff;padding:56px 0;text-align:center;
}
.cta-banner h2{font-size:28px;margin-bottom:10px}
.cta-banner p{color:#cfdcec;margin-bottom:22px}

/* ============ Footer ============ */
.site-footer{background:#0a2540;color:#cfdcec;padding:56px 0 24px;font-size:14px}
.foot-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1.2fr;gap:32px;margin-bottom:32px}
.foot-grid h5{color:#fff;font-size:15px;margin-bottom:14px}
.foot-grid a{color:#cfdcec;display:block;padding:4px 0}
.foot-grid a:hover{color:#fff}
.foot-bottom{border-top:1px solid #1a3858;padding-top:18px;display:flex;justify-content:space-between;flex-wrap:wrap;gap:10px;color:#8aa1bd}

/* ============ Responsive ============ */
@media (max-width: 960px){
  .grid-3,.grid-4{grid-template-columns:repeat(2,1fr)}
  .kpis{grid-template-columns:repeat(2,1fr);margin-top:-30px}
  .about-grid,.contact-grid{grid-template-columns:1fr}
  .foot-grid{grid-template-columns:1fr 1fr}
  .certs{grid-template-columns:repeat(2,1fr)}
}
@media (max-width: 680px){
  .nav-links{
    display:none;position:absolute;top:var(--header-h);left:0;right:0;
    background:#fff;flex-direction:column;gap:0;padding:8px 0;border-bottom:1px solid var(--border);
  }
  .nav-links.open{display:flex}
  .nav-links li{border-bottom:1px solid var(--border)}
  .nav-links a{display:block;padding:14px 24px}
  .nav-links a.active::after{display:none}
  .menu-toggle{display:block}
  .nav-cta .btn{display:none}
  .grid-3,.grid-4,.foot-grid,.form-row,.timeline .item{grid-template-columns:1fr}
  section{padding:56px 0}
  .hero{padding:64px 0 80px}
}