/* ============================================================
   WeikeLao Power — SST Solid State Transformer & Grid Solutions
   style.css  v1.0  (Industrial B2B theme: deep blue + gold)
   ============================================================ */
*{margin:0;padding:0;box-sizing:border-box}
:root{
  --dark:#0a1628;--blue:#1a56db;--gold:#d4a853;
  --light:#f7f8fa;--gray:#4a5568;--bg2:#f0f2f5;
  --line:#e2e8f0;--ink:#1a202c;--muted:#718096;
}
html{scroll-behavior:smooth}
body{font-family:system-ui,-apple-system,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;color:var(--ink);line-height:1.7;background:var(--light);-webkit-font-smoothing:antialiased}
img{max-width:100%;display:block}
a{color:var(--blue);text-decoration:none}
.wrap{max-width:1080px;margin:0 auto;padding:0 24px}
.sec{padding:70px 0}
.center{text-align:center}
.lead{max-width:640px;margin:10px auto 0;color:var(--gray);font-size:1.02rem}
.sec-tag{display:inline-block;font-size:.78rem;font-weight:700;letter-spacing:2px;text-transform:uppercase;color:var(--blue);margin-bottom:8px}
.sub{display:inline-block;font-size:.75rem;font-weight:700;letter-spacing:2px;text-transform:uppercase;color:var(--gold);margin-bottom:6px}
h1,h2,h3,h4{line-height:1.3;font-weight:700}
h1{font-size:2rem}h2{font-size:1.7rem}h3{font-size:1.15rem}h4{font-size:.95rem}

/* ---------- Header / Nav ---------- */
header{position:sticky;top:0;z-index:100;background:#fff;border-bottom:1px solid var(--line)}
.nav{display:flex;align-items:center;justify-content:space-between;height:72px;gap:20px}
.logo{display:flex;align-items:center;gap:12px;color:var(--ink);font-weight:700;font-size:1.05rem}
.logo .mark{background:linear-gradient(135deg,var(--dark),#16305e);color:var(--gold);font-size:.78rem;font-weight:800;letter-spacing:1px;padding:8px 12px;border-radius:8px}
.logo small{display:block;font-size:.62rem;font-weight:500;color:var(--muted);letter-spacing:.4px;line-height:1.2}
.menu{display:flex;align-items:center;gap:26px}
.menu a{color:var(--gray);font-size:.92rem;font-weight:600;padding:4px 0;border-bottom:2px solid transparent;transition:color .2s,border-color .2s}
.menu a:hover,.menu a.on{color:var(--blue);border-color:var(--gold)}
.burger{display:none;flex-direction:column;justify-content:center;gap:5px;width:42px;height:42px;background:none;border:none;cursor:pointer}
.burger span{height:2px;width:24px;background:var(--dark);border-radius:2px;transition:.25s}

/* ---------- Buttons ---------- */
.btn{display:inline-block;padding:12px 32px;border-radius:8px;font-weight:700;font-size:.95rem;letter-spacing:.5px;transition:background .2s,transform .2s,box-shadow .2s;cursor:pointer;border:2px solid transparent;text-align:center}
.btn-gold{background:var(--gold);color:#000}
.btn-gold:hover{background:#e0b040;transform:translateY(-2px)}
.btn-blue{background:var(--blue);color:#fff}
.btn-blue:hover{background:#1348b8;transform:translateY(-2px)}
.btn-ghost{background:transparent;color:#fff;border-color:rgba(255,255,255,.45)}
.btn-ghost:hover{background:rgba(255,255,255,.1);border-color:#fff}

/* ---------- Hero (home) ---------- */
.hero{background:linear-gradient(135deg,#0a1628,#0f2550,#1a3a6e);color:#fff;padding:96px 0 84px;text-align:center;position:relative;overflow:hidden}
.hero::after{content:'';position:absolute;bottom:0;left:0;width:100%;height:4px;background:var(--gold)}
.hero .tagline{display:inline-block;font-size:.8rem;font-weight:700;letter-spacing:3px;text-transform:uppercase;color:#8eb8e0;border:1px solid rgba(255,255,255,.22);padding:8px 20px;border-radius:30px;margin-bottom:26px}
.hero h1{font-size:2.7rem;font-weight:800;letter-spacing:1px;max-width:820px;margin:0 auto}
.hero h1 em{color:var(--gold);font-style:normal}
.hero p{max-width:720px;margin:20px auto 0;color:#c9d8ec;font-size:1.05rem}
.cta-row{display:flex;justify-content:center;gap:16px;margin-top:34px;flex-wrap:wrap}
.stat-row{display:flex;justify-content:center;gap:52px;margin-top:58px;flex-wrap:wrap}
.stat b{display:block;font-size:1.9rem;font-weight:800;color:var(--gold)}
.stat span{font-size:.8rem;color:#9db6d8;letter-spacing:.5px}

/* ---------- Page hero (inner pages) ---------- */
.page-hero{background:linear-gradient(135deg,#0a1628,#16305e);color:#fff;padding:66px 0 60px;text-align:center}
.page-hero h1{font-size:2.2rem}
.page-hero p{max-width:680px;margin:14px auto 0;color:#c9d8ec;font-size:1rem}

/* ---------- Grids & Cards ---------- */
.grid{display:grid;gap:24px}
.g2{grid-template-columns:repeat(2,1fr)}
.g3{grid-template-columns:repeat(3,1fr)}
.g4{grid-template-columns:repeat(4,1fr)}
.card{background:#fff;border:1px solid var(--line);border-radius:12px;padding:30px 26px;transition:transform .25s,box-shadow .25s}
.card:hover{transform:translateY(-5px);box-shadow:0 14px 34px rgba(10,22,40,.10)}
.card h3{font-size:1.08rem;margin:16px 0 10px}
.card p{font-size:.9rem;color:var(--gray)}
.ico{width:52px;height:52px;border-radius:12px;background:#eef3fc;color:var(--blue);display:flex;align-items:center;justify-content:center}
.p-card{padding:0;overflow:hidden;display:flex;flex-direction:column}
.p-card .ph{height:170px;overflow:hidden;display:flex;align-items:center;justify-content:center;background:#eef3fc}
.p-card .ph img{width:100%;height:100%;object-fit:cover;display:block;transition:transform .35s}
.p-card:hover .ph img{transform:scale(1.08)}
.p-card .bd{padding:22px 22px 24px;display:flex;flex-direction:column;flex:1}
.p-card .bd h3{margin:6px 0 8px}
.badge{display:inline-block;background:var(--gold);color:#000;font-size:.68rem;font-weight:800;letter-spacing:1px;text-transform:uppercase;padding:4px 10px;border-radius:4px;margin-bottom:4px}
.link{color:var(--blue);font-weight:700;font-size:.9rem;margin-top:auto;padding-top:14px}
.link:hover{text-decoration:underline}

/* ---------- Case cards ---------- */
.case-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;margin-top:30px}
.c-card{position:relative;border-radius:12px;overflow:hidden;min-height:260px;display:flex;align-items:flex-end;background:linear-gradient(160deg,#16305e,#0a1628);color:#fff}
.c-card .bg{position:absolute;inset:0;background-size:cover;background-position:center;background-color:#1a3a6e;transition:transform .4s}
.c-card:hover .bg{transform:scale(1.06)}
.c-card .ct{position:relative;z-index:2;padding:22px 20px;background:linear-gradient(0deg,rgba(6,12,24,.88),transparent);width:100%}
.c-card .tag{display:inline-block;font-size:.7rem;font-weight:700;letter-spacing:1px;text-transform:uppercase;color:var(--gold);margin-bottom:6px}
.c-card h3{font-size:1.05rem;margin-bottom:6px}
.c-card p{font-size:.84rem;color:#b9c8de;margin-bottom:6px}

/* ---------- Trust band ---------- */
.trust{background:var(--dark);color:#fff;border-radius:0;padding:0}
.trust .grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
.t-item{text-align:center;padding:26px 12px}
.t-item b{display:block;font-size:1.7rem;font-weight:800;color:var(--gold)}
.t-item span{font-size:.8rem;color:#9db6d8}

/* ---------- CTA band ---------- */
.cta-sec{background:linear-gradient(135deg,#0a1628,#16305e);color:#fff;text-align:center;padding:64px 0}
.cta-sec h2{font-size:1.8rem}
.cta-sec p{color:#c9d8ec;margin:12px auto 26px;max-width:620px}

/* ---------- Detail box / spec table ---------- */
.detail-box{background:#fff;border:1px solid var(--line);border-radius:14px;padding:34px 34px 36px;box-shadow:0 4px 18px rgba(10,22,40,.05)}
.detail-box h3{font-size:1.35rem;margin-bottom:12px}
.detail-box p{color:var(--gray);margin-bottom:10px;font-size:.95rem}
.detail-box p strong{color:var(--ink)}
.chips{display:flex;flex-wrap:wrap;gap:10px;margin:16px 0 20px}
.chip{background:#eef3fc;color:var(--blue);border:1px solid #d6e2f8;font-size:.78rem;font-weight:600;padding:6px 14px;border-radius:30px}
.spec{width:100%;border-collapse:collapse;margin:18px 0 8px;font-size:.9rem}
.spec th{background:var(--dark);color:#fff;text-align:left;padding:11px 16px;font-weight:600;width:34%}
.spec td{padding:11px 16px;border-bottom:1px solid var(--line);color:var(--gray)}
.spec tr:nth-child(even) td{background:#fafbfd}
.prod-detail{display:none;margin-top:26px}
.prod-detail.open{display:block}

/* ---------- Filters ---------- */
.cat-filter,.case-filter{display:flex;flex-wrap:wrap;justify-content:center;gap:10px;margin:0 0 26px}
.cat-filter button,.case-filter button{background:#fff;border:1px solid var(--line);border-radius:30px;padding:9px 22px;font-size:.85rem;font-weight:600;color:var(--gray);cursor:pointer;transition:.2s}
.cat-filter button:hover,.case-filter button:hover{color:var(--blue);border-color:var(--blue)}
.cat-filter button.on,.case-filter button.on{background:var(--blue);border-color:var(--blue);color:#fff}

/* ---------- Contact / Forms ---------- */
.contact-grid{display:grid;grid-template-columns:1.5fr 1fr;gap:40px;align-items:start}
.form-box{background:#fff;border:1px solid var(--line);border-radius:14px;padding:32px 30px}
.form-ok{display:none;background:#e8f6ee;color:#1c7c3f;border:1px solid #bfe8cd;border-radius:8px;padding:14px 18px;font-size:.92rem;font-weight:600;margin-bottom:18px}
.form-ok.show{display:block}
.form-row{display:grid;grid-template-columns:1fr 1fr;gap:18px}
.f-field{margin-bottom:18px}
.f-field label{display:block;font-size:.83rem;font-weight:600;color:var(--gray);margin-bottom:7px}
.f-field input,.f-field select,.f-field textarea{width:100%;padding:12px 14px;border:1px solid var(--line);border-radius:8px;font-size:.93rem;font-family:inherit;background:#fcfdfe;color:var(--ink);transition:border-color .2s,box-shadow .2s}
.f-field input:focus,.f-field select:focus,.f-field textarea:focus{outline:none;border-color:var(--blue);box-shadow:0 0 0 3px rgba(26,86,219,.12)}
.f-field textarea{min-height:130px;resize:vertical}
.info-card{background:#fff;border:1px solid var(--line);border-radius:14px;padding:26px 24px}
.info-card h3{font-size:1.05rem;margin-bottom:16px}
.info-card .row{display:flex;align-items:flex-start;gap:12px;margin-bottom:14px;font-size:.92rem;color:var(--gray)}
.info-card .row svg{flex-shrink:0;color:var(--blue);margin-top:3px}

/* ---------- Footer ---------- */
footer{background:var(--dark);color:#9db6d8;padding:52px 0 0;font-size:.88rem}
.f-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1.2fr;gap:36px;padding-bottom:36px}
.f-grid h4{color:#fff;font-size:.95rem;margin-bottom:14px}
.f-grid p{margin-bottom:8px}
.f-grid a{display:block;color:#9db6d8;margin-bottom:8px}
.f-grid a:hover{color:var(--gold)}
.f-meta{border-top:1px solid rgba(255,255,255,.08);padding:18px 0;text-align:center;font-size:.8rem;color:#718096}

/* ---------- Responsive ---------- */
@media (max-width:992px){
  .g3,.g4,.case-grid{grid-template-columns:repeat(2,1fr)}
  .f-grid{grid-template-columns:1fr 1fr}
  .contact-grid{grid-template-columns:1fr}
  .hero h1{font-size:2.1rem}
}
@media (max-width:768px){
  .menu{position:fixed;top:72px;left:0;right:0;background:#fff;flex-direction:column;align-items:flex-start;gap:0;padding:0 24px;max-height:0;overflow:hidden;border-bottom:1px solid var(--line);transition:max-height .3s}
  .menu.open{max-height:420px;padding:14px 24px 20px}
  .menu a{width:100%;padding:12px 0;border-bottom:1px solid var(--line)}
  .menu .btn{margin-top:12px;width:100%}
  .burger{display:flex}
  .g2,.g3,.g4,.case-grid{grid-template-columns:1fr}
  .f-grid{grid-template-columns:1fr}
  .form-row{grid-template-columns:1fr}
  .stat-row{gap:30px}
  .hero{padding:70px 0 60px}
  .hero h1{font-size:1.75rem}
  .sec{padding:52px 0}
  .trust .grid{grid-template-columns:repeat(2,1fr)}
}