/* ============================================================
   ALKKT OEM/ODM site - stylesheet
   Palette: navy #0B1622 / white / ALKKT red #E2231A
   ============================================================ */
:root{
  --navy:#0b1622;
  --navy-2:#101f31;
  --ink:#1a2430;
  --body:#3d4956;
  --muted:#7b8794;
  --red:#e2231a;
  --red-dark:#b81b14;
  --line:#e3e8ee;
  --bg-soft:#f5f7fa;
  --white:#ffffff;
  --radius:14px;
  --shadow:0 10px 30px rgba(11,22,34,.08);
  --font:'Inter','Segoe UI',system-ui,-apple-system,'Helvetica Neue',Arial,sans-serif;
}
*{margin:0;padding:0;box-sizing:border-box}
html{scroll-behavior:smooth}
body{font-family:var(--font);color:var(--body);background:var(--white);line-height:1.65;font-size:16px;-webkit-font-smoothing:antialiased}
img{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
.container{width:min(1180px,92%);margin:0 auto}
h1,h2,h3{color:var(--ink);line-height:1.2;font-weight:800;letter-spacing:-.01em}
h2{font-size:clamp(1.6rem,3.2vw,2.4rem)}
h3{font-size:1.05rem}

/* ---------- Buttons ---------- */
.btn{display:inline-flex;align-items:center;justify-content:center;gap:.5em;padding:.8em 1.6em;border-radius:10px;font-weight:600;font-size:.95rem;transition:.2s;border:2px solid transparent;cursor:pointer}
.btn-primary{background:var(--red);color:#fff}
.btn-primary:hover{background:var(--red-dark);transform:translateY(-1px)}
.btn-ghost{border-color:rgba(255,255,255,.55);color:#fff}
.btn-ghost:hover{background:rgba(255,255,255,.12)}
.btn-lg{padding:1em 2.1em;font-size:1.02rem}

/* ---------- Header ---------- */
.site-header{position:fixed;top:0;left:0;right:0;z-index:100;background:rgba(11,22,34,.92);backdrop-filter:blur(10px);border-bottom:1px solid rgba(255,255,255,.08)}
.header-inner{display:flex;align-items:center;justify-content:space-between;height:72px}
.brand-logo{height:44px;width:auto}
.main-nav{display:flex;align-items:center;gap:28px}
.main-nav a{color:#dbe3ea;font-weight:500;font-size:.95rem;transition:.2s;padding:.5em .85em;border-radius:7px}
.main-nav a:hover{color:#fff;background:rgba(255,255,255,.1)}
.main-nav a.active{color:#fff;background:var(--red)}
.main-nav .nav-cta{padding:.6em 1.3em}
.nav-toggle{display:none;background:none;border:0;cursor:pointer;padding:8px}
.nav-toggle span{display:block;width:24px;height:2px;background:#fff;margin:5px 0;transition:.25s}

/* ---------- Hero ---------- */
.hero{position:relative;min-height:100vh;display:flex;align-items:center;color:#fff;padding:120px 0 80px}
.hero-bg{position:absolute;inset:0;background:linear-gradient(100deg,rgba(8,15,24,.93) 0%,rgba(8,15,24,.72) 45%,rgba(8,15,24,.45) 100%),url('../img/factory-aerial.webp') center/cover no-repeat}
.hero-content{position:relative;max-width:820px}
.hero-kicker{color:#ffb3ae;font-weight:600;letter-spacing:.12em;text-transform:uppercase;font-size:.85rem;margin-bottom:18px}
.hero h1{color:#fff;font-size:clamp(2.2rem,5.2vw,3.8rem);margin-bottom:22px}
.hero h1 em{font-style:normal;color:var(--red);position:relative}
.hero-sub{font-size:1.12rem;color:#c3cedb;max-width:640px;margin-bottom:34px}
.hero-actions{display:flex;gap:16px;flex-wrap:wrap;margin-bottom:44px}
.hero-badges{display:flex;gap:12px;flex-wrap:wrap;list-style:none}
.hero-badges li{border:1px solid rgba(255,255,255,.25);border-radius:999px;padding:.35em 1em;font-size:.82rem;color:#dbe3ea;background:rgba(255,255,255,.06)}

/* ---------- Trust bar ---------- */
.trustbar{background:var(--navy-2);padding:26px 0;border-top:1px solid rgba(255,255,255,.06)}
.trustbar-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.trust-item{text-align:center}
.trust-item strong{display:block;color:#fff;font-size:1rem;margin-bottom:2px}
.trust-item span{color:#8fa0b3;font-size:.86rem}

/* ---------- Sections ---------- */
.section{padding:96px 0}
.section-head{max-width:680px;margin:0 auto 56px;text-align:center}
.section-head.light h2{color:#fff}
.section-head.light .section-desc{color:#a9b8c9}
.section-kicker{color:var(--red);font-weight:700;text-transform:uppercase;letter-spacing:.12em;font-size:.82rem;margin-bottom:12px}
.section-desc{color:var(--muted);margin-top:14px}

/* ---------- About ---------- */
.about{background:var(--bg-soft)}
.about-grid{display:grid;grid-template-columns:1fr 1.15fr;gap:60px;align-items:center}
.about-media img{border-radius:var(--radius);box-shadow:var(--shadow);width:100%;object-fit:cover;aspect-ratio:4/3}
.about-text p{margin-bottom:16px}
.check-list{list-style:none;margin-top:10px}
.check-list li{padding-left:30px;position:relative;margin-bottom:10px}
.check-list li::before{content:"";position:absolute;left:0;top:.32em;width:19px;height:19px;border-radius:50%;background:var(--red) url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" fill="white"><path d="M9 16.2 4.8 12l-1.4 1.4L9 19 21 7l-1.4-1.4z"/></svg>') center/13px no-repeat}
.text-link{color:var(--red);font-weight:600;border-bottom:1px solid rgba(227,35,26,.35);transition:.2s}
.text-link:hover{border-bottom-color:var(--red)}

/* ---------- Products ---------- */
.products{background:#fff}
.product-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
.product-card{background:var(--navy);border-radius:var(--radius);overflow:hidden;cursor:pointer;transition:transform .25s,box-shadow .25s;border:1px solid #16283c}
.product-card:hover{transform:translateY(-6px);box-shadow:0 18px 40px rgba(11,22,34,.25)}
.pc-img{background:#05090f;aspect-ratio:4/3;display:flex;align-items:center;justify-content:center;overflow:hidden}
.pc-img img{width:100%;height:100%;object-fit:cover;transition:transform .4s}
.product-card:hover .pc-img img{transform:scale(1.05)}
.pc-body{padding:18px 20px 20px;color:#fff}
.pc-body h3{color:#fff;font-size:1rem;margin-bottom:6px}
.pc-models{font-size:.78rem;color:#8fa0b3;margin-bottom:10px;min-height:2.3em}
.pc-body p{font-size:.86rem;color:#b7c4d2;line-height:1.55}
.pc-link{display:inline-block;margin-top:12px;color:#ff6f67;font-weight:600;font-size:.86rem}

/* ---------- OEM ---------- */
.oem{background:linear-gradient(160deg,#0b1622 0%,#13253a 100%)}
.oem-steps{list-style:none;display:grid;grid-template-columns:repeat(3,1fr);gap:22px;counter-reset:step}
.oem-steps li{background:rgba(255,255,255,.05);border:1px solid rgba(255,255,255,.1);border-radius:var(--radius);padding:26px 24px;transition:.25s}
.oem-steps li:hover{background:rgba(227,35,26,.12);border-color:rgba(227,35,26,.4);transform:translateY(-4px)}
.oem-steps span{display:inline-block;font-size:1.6rem;font-weight:800;color:var(--red);margin-bottom:10px}
.oem-steps h3{color:#fff;margin-bottom:8px}
.oem-steps p{color:#a9b8c9;font-size:.9rem}
.oem-cta{text-align:center;margin-top:52px;color:#c3cedb}
.oem-cta p{margin-bottom:20px;font-size:1.05rem}

/* ---------- Factory ---------- */
.factory{background:var(--bg-soft)}
.factory-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:18px}
.factory-item{position:relative;overflow:hidden;border-radius:12px;margin:0;background:#dde4ec}
.factory-item.wide{grid-column:span 2}
.factory-item img{width:100%;aspect-ratio:16/10;object-fit:cover;transition:transform .4s}
.factory-item:hover img{transform:scale(1.04)}
.factory-item figcaption{position:absolute;left:0;right:0;bottom:0;padding:34px 16px 12px;font-size:.85rem;color:#fff;background:linear-gradient(transparent,rgba(8,15,24,.85))}

/* ---------- Factory visit band ---------- */
.visit-band{margin-top:44px;border-radius:var(--radius);overflow:hidden;position:relative;display:flex;align-items:center;justify-content:space-between;gap:40px;padding:52px 48px;color:#fff;background:linear-gradient(100deg,rgba(8,15,24,.95) 0%,rgba(8,15,24,.78) 55%,rgba(8,15,24,.6) 100%),url('../img/factory-aerial.webp') center/cover no-repeat}
.visit-text{position:relative;max-width:660px}
.visit-band h3{color:#fff;font-size:clamp(1.2rem,2.2vw,1.6rem);margin:8px 0 14px;line-height:1.35}
.visit-band p{color:#b7c4d2;font-size:.95rem}
.visit-band .btn{position:relative;flex:0 0 auto}

/* ---------- Certifications ---------- */
.certs{background:#fff}
.cert-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px}
.cert-item{border:1px solid var(--line);border-radius:12px;overflow:hidden;cursor:pointer;background:#fff;transition:.25s}
.cert-item:hover{box-shadow:var(--shadow);transform:translateY(-4px);border-color:#c8d2dd}
.cert-item img{aspect-ratio:.78;object-fit:cover;width:100%}
.cert-item figcaption{padding:10px 12px;font-size:.83rem;color:var(--ink);font-weight:600;text-align:center}

/* ---------- FAQ ---------- */
.faq{background:var(--bg-soft)}
.faq-list{max-width:860px;margin:0 auto;display:flex;flex-direction:column;gap:12px}
.faq-item{background:#fff;border:1px solid var(--line);border-radius:12px;padding:0 22px;transition:.2s}
.faq-item[open]{border-color:#c8d2dd;box-shadow:var(--shadow)}
.faq-item summary{cursor:pointer;font-weight:700;color:var(--ink);font-size:1rem;padding:18px 0;list-style:none;display:flex;align-items:center;justify-content:space-between;gap:16px}
.faq-item summary::-webkit-details-marker{display:none}
.faq-item summary::after{content:"+";font-size:1.4rem;font-weight:400;color:var(--red);line-height:1;flex:0 0 auto;transition:transform .2s}
.faq-item[open] summary::after{transform:rotate(45deg)}
.faq-item p{padding:0 0 18px;color:var(--body);font-size:.94rem}

/* ---------- Contact ---------- */
.contact{background:var(--bg-soft);border-top:1px solid var(--line)}
.contact-grid{display:grid;grid-template-columns:1fr 1.25fr;gap:44px;align-items:start}
.contact-cards{display:flex;flex-direction:column;gap:14px}
.contact-card{display:flex;gap:14px;align-items:flex-start;background:#fff;border:1px solid var(--line);border-radius:12px;padding:16px 18px;transition:.2s}
.contact-card:not(.static):hover{border-color:var(--red);box-shadow:var(--shadow);transform:translateX(4px)}
.cc-icon{flex:0 0 42px;width:42px;height:42px;border-radius:10px;display:flex;align-items:center;justify-content:center;background:rgba(227,35,26,.1)}
.cc-icon svg{width:22px;height:22px;fill:var(--red)}
.cc-icon.wa{background:rgba(37,211,102,.12)}.cc-icon.wa svg{fill:#25d366}
.contact-card strong{display:block;color:var(--ink);font-size:.95rem}
.contact-card em{font-style:normal;color:var(--muted);font-size:.87rem;word-break:break-word;display:block}
.contact-card em.alt{color:#9aa7b4;font-size:.84rem}

.inquiry-form{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:32px;box-shadow:var(--shadow)}
.inquiry-form h3{margin-bottom:20px;font-size:1.2rem}
.form-row{display:grid;grid-template-columns:1fr 1fr;gap:16px}
.inquiry-form label{display:block;font-size:.86rem;font-weight:600;color:var(--ink);margin-bottom:14px}
.inquiry-form label span{color:var(--red);margin-left:3px}
.inquiry-form input,.inquiry-form select,.inquiry-form textarea{display:block;width:100%;margin-top:6px;font-family:inherit;font-size:.92rem;padding:.7em .9em;border:1px solid #cfd8e1;border-radius:8px;background:#fbfcfe;transition:.2s;color:var(--ink)}
.inquiry-form input:focus,.inquiry-form select:focus,.inquiry-form textarea:focus{outline:none;border-color:var(--red);background:#fff;box-shadow:0 0 0 3px rgba(227,35,26,.1)}
.inquiry-form textarea{resize:vertical}
.form-note{font-size:.8rem;color:var(--muted);margin-top:12px;text-align:center}

/* ---------- Form success modal ---------- */
.form-modal{position:fixed;inset:0;z-index:300;background:rgba(5,9,15,.6);backdrop-filter:blur(4px);display:none;align-items:center;justify-content:center;padding:24px}
.form-modal.open{display:flex}
.form-modal-card{background:#fff;border-radius:16px;max-width:420px;width:100%;padding:40px 36px 32px;text-align:center;animation:fmpop .25s ease}
@keyframes fmpop{from{transform:translateY(16px) scale(.96);opacity:0}to{transform:none;opacity:1}}
.form-modal-card h3{color:var(--ink);font-size:1.3rem;margin:18px 0 10px}
.form-modal-card p{color:var(--muted);font-size:.92rem;line-height:1.6;margin-bottom:24px}
.fm-icon{width:64px;height:64px;margin:0 auto;border-radius:50%;background:var(--red);color:#fff;font-size:2rem;font-weight:700;display:flex;align-items:center;justify-content:center;line-height:1}
.fm-icon.warn{background:#e6a23c}
#submitBtn{width:100%;margin-top:4px}
#submitBtn[disabled]{opacity:.6;cursor:wait}

/* ---------- Footer ---------- */
.site-footer{background:var(--navy);color:#9fb0c1;padding:64px 0 0}
.footer-grid{display:grid;grid-template-columns:1.6fr 1fr 1.2fr 1.3fr;gap:40px;padding-bottom:48px}
.footer-logo{height:38px;margin-bottom:16px}
.footer-brand p{font-size:.88rem}
.footer-col h4{color:#fff;font-size:.95rem;margin-bottom:16px}
.footer-col a,.footer-col span{display:block;margin-bottom:9px;font-size:.88rem;transition:.2s}
.footer-col a:hover{color:#fff}
.footer-bottom{border-top:1px solid rgba(255,255,255,.08);padding:20px 0;font-size:.82rem;display:flex;justify-content:space-between;flex-wrap:wrap;gap:8px}

/* ---------- Floating WA ---------- */
.wa-float{position:fixed;right:22px;bottom:22px;width:58px;height:58px;border-radius:50%;background:#25d366;color:#fff;display:flex;align-items:center;justify-content:center;box-shadow:0 8px 24px rgba(37,211,102,.45);z-index:99;transition:.25s}
.wa-float:hover{transform:scale(1.08)}

/* ---------- Lightbox ---------- */
.lightbox{position:fixed;inset:0;z-index:200;background:rgba(5,9,15,.94);display:none;align-items:center;justify-content:center;flex-direction:column;padding:40px}
.lightbox.open{display:flex}
.lightbox img{max-width:90vw;max-height:78vh;object-fit:contain;border-radius:8px}
.lb-caption{color:#c3cedb;margin-top:14px;font-size:.95rem}
.lightbox button{position:absolute;background:rgba(255,255,255,.1);border:1px solid rgba(255,255,255,.25);color:#fff;font-size:2rem;width:52px;height:52px;border-radius:50%;cursor:pointer;line-height:1;display:flex;align-items:center;justify-content:center;transition:.2s}
.lightbox button:hover{background:var(--red)}
.lb-close{top:24px;right:24px}
.lb-prev{left:24px;top:50%;transform:translateY(-50%)}
.lb-next{right:24px;top:50%;transform:translateY(-50%)}

/* ---------- Reveal on scroll ---------- */
.reveal{opacity:0;transform:translateY(26px);transition:opacity .7s ease,transform .7s ease}
.reveal.in{opacity:1;transform:none}
@media (prefers-reduced-motion:reduce){.reveal{opacity:1;transform:none;transition:none}}

/* ---------- Responsive ---------- */
@media (max-width:1000px){
  .product-grid{grid-template-columns:repeat(2,1fr)}
  .cert-grid{grid-template-columns:repeat(3,1fr)}
  .about-grid,.contact-grid{grid-template-columns:1fr;gap:36px}
  .oem-steps{grid-template-columns:repeat(2,1fr)}
  .factory-grid{grid-template-columns:repeat(2,1fr)}
  .factory-item.wide{grid-column:span 2}
  .footer-grid{grid-template-columns:1fr 1fr}
  .visit-band{flex-direction:column;align-items:flex-start;gap:26px;padding:40px 32px}
}
@media (max-width:640px){
  .nav-toggle{display:block}
  .main-nav{position:fixed;top:72px;right:-100%;width:min(320px,80vw);height:calc(100vh - 72px);background:var(--navy-2);flex-direction:column;align-items:flex-start;padding:32px;gap:22px;transition:right .3s;border-left:1px solid rgba(255,255,255,.08)}
  .main-nav.open{right:0}
  .trustbar-grid,.oem-steps,.factory-grid,.footer-grid{grid-template-columns:1fr}
  .factory-item.wide{grid-column:span 1}
  .product-grid,.cert-grid{grid-template-columns:repeat(2,1fr)}
  .form-row{grid-template-columns:1fr}
  .section{padding:64px 0}
  .hero{min-height:auto;padding:130px 0 70px}
  .visit-band{padding:32px 24px}
}
@media (max-width:420px){
  .product-grid,.cert-grid{grid-template-columns:1fr}
}