/* ===== Oktan Kimya — site styles ===== */
*{box-sizing:border-box;-webkit-font-smoothing:antialiased;}
html{scroll-behavior:smooth;}
body{margin:0;font-family:'Hanken Grotesk',system-ui,sans-serif;color:#141413;background:#fff;}
::selection{background:#111;color:#fff;}
a{text-decoration:none;color:inherit;}
img{display:block;}
input,textarea{font-family:inherit;}
h1,h2,h3,h4{font-family:'Archivo',sans-serif;margin:0;}

.wrap{max-width:1240px;margin:0 auto;padding:0 32px;}

/* ---------- header ---------- */
.site-header{position:sticky;top:0;z-index:50;background:rgba(255,255,255,0.92);backdrop-filter:saturate(140%) blur(8px);-webkit-backdrop-filter:saturate(140%) blur(8px);border-bottom:1px solid #ebeae7;}
.header-inner{height:74px;display:flex;align-items:center;justify-content:space-between;}
.brand{display:flex;align-items:center;gap:12px;}
.brand-mark{width:30px;height:30px;background:#141413;display:flex;align-items:center;justify-content:center;}
.brand-mark span{width:11px;height:11px;background:#fff;}
.brand-name{font-family:'Archivo',sans-serif;font-weight:800;font-size:19px;letter-spacing:0.14em;}
.desktop-nav{display:flex;align-items:center;gap:38px;}
.desktop-nav a{font-size:14px;font-weight:500;letter-spacing:0.02em;color:#52514c;padding:4px 0;transition:color .15s;}
.desktop-nav a:hover{color:#141413;}
.desktop-nav a.btn-cta,.mobile-nav a.btn-cta{font-size:13px;font-weight:600;letter-spacing:0.04em;text-transform:uppercase;padding:11px 20px;border-radius:8px;background:#141413;color:#fff;border-bottom:none;transition:opacity .15s;}
.desktop-nav a.btn-cta:hover,.mobile-nav a.btn-cta:hover{opacity:.85;color:#fff;}
.burger{display:none;background:none;border:none;cursor:pointer;padding:8px;flex-direction:column;gap:5px;}
.burger span{width:22px;height:2px;background:#141413;display:block;}
.mobile-nav{display:none;border-top:1px solid #ebeae7;background:#fff;padding:14px 32px 22px;}
.mobile-nav.open{display:block;}
.mobile-nav a{display:block;padding:12px 0;font-size:16px;font-weight:500;border-bottom:1px solid #f1f0ed;}
.mobile-nav .btn-cta{display:inline-block;margin-top:16px;border-bottom:none;}

/* ---------- hero ---------- */
.hero{border-bottom:1px solid #ebeae7;}
.hero-grid{display:grid;grid-template-columns:1.05fr 0.95fr;align-items:stretch;}
.hero-text{padding:96px 64px 96px 0;display:flex;flex-direction:column;justify-content:center;}
.eyebrow{font-size:12px;font-weight:600;letter-spacing:0.22em;text-transform:uppercase;color:#9a988f;margin-bottom:28px;}
.hero-text h1{font-weight:800;font-size:clamp(40px,5vw,68px);line-height:1.02;letter-spacing:-0.025em;margin-bottom:28px;}
.hero-text p{font-size:18px;line-height:1.6;color:#52514c;max-width:480px;margin:0 0 40px;}
.hero-actions{display:flex;gap:16px;flex-wrap:wrap;}
.btn-solid{font-size:14px;font-weight:600;letter-spacing:0.03em;border-radius:8px;padding:15px 28px;background:#141413;color:#fff;transition:opacity .15s;}
.btn-solid:hover{opacity:.85;}
.btn-outline{font-size:14px;font-weight:600;letter-spacing:0.03em;border-radius:8px;padding:15px 28px;border:1px solid #141413;color:#141413;transition:background .15s,color .15s;}
.btn-outline:hover{background:#141413;color:#fff;}
.hero-media{position:relative;border-left:1px solid #ebeae7;min-height:560px;overflow:hidden;}
.hero-media img{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;object-position:center bottom;}

/* capability strip */
.strip{border-top:1px solid #ebeae7;background:#fff;}
.strip-inner{padding:32px;display:grid;grid-template-columns:repeat(4,1fr);gap:28px;}
.strip-item{display:flex;gap:14px;align-items:flex-start;}
.strip-num{flex:none;width:34px;height:34px;border-radius:50%;background:#f1f0ec;display:flex;align-items:center;justify-content:center;font-family:'Archivo',sans-serif;font-weight:700;font-size:12px;color:#141413;}
.strip-item span.t{font-size:14px;font-weight:500;color:#3a3934;line-height:1.4;padding-top:7px;}

/* ---------- section scaffolding ---------- */
.section{padding:104px 0;}
.section.alt{background:#f5f4f1;border-top:1px solid #ebeae7;}
.section.plain{background:#fff;border-top:1px solid #ebeae7;}
.section-label{font-size:12px;font-weight:600;letter-spacing:0.2em;text-transform:uppercase;color:#9a988f;margin-bottom:18px;}
.section h2{font-weight:800;font-size:clamp(30px,3.4vw,46px);line-height:1.06;letter-spacing:-0.02em;}

/* who we are */
.about-head{display:grid;grid-template-columns:340px 1fr;gap:64px;align-items:start;}
.about-head h2{margin:0;}
.about-head .lead{font-size:19px;line-height:1.65;color:#3a3934;margin:0 0 18px;max-width:640px;}
.about-head .sub{font-size:16px;line-height:1.65;color:#6b6a64;margin:0;max-width:640px;}
.pillars{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;margin-top:64px;}
.pillar{padding:34px 32px;background:#fff;border:1px solid #ecebe7;border-radius:14px;box-shadow:0 1px 3px rgba(20,20,19,0.04);}
.pillar .num{width:40px;height:40px;border-radius:50%;background:#141413;color:#fff;display:flex;align-items:center;justify-content:center;font-family:'Archivo',sans-serif;font-weight:700;font-size:13px;margin-bottom:22px;}
.pillar h3{font-weight:700;font-size:19px;letter-spacing:-0.01em;margin-bottom:12px;}
.pillar p{font-size:14.5px;line-height:1.6;color:#6b6a64;margin:0;}
.steps-block{margin-top:80px;}
.steps{display:grid;grid-template-columns:repeat(4,1fr);gap:24px;}
.step .num{width:36px;height:36px;border-radius:50%;border:1.5px solid #141413;display:flex;align-items:center;justify-content:center;font-family:'Archivo',sans-serif;font-weight:800;font-size:13px;margin-bottom:18px;}
.step h4{font-weight:700;font-size:17px;margin-bottom:10px;}
.step p{font-size:14px;line-height:1.55;color:#6b6a64;margin:0;}

/* products */
.products-intro{max-width:720px;margin-bottom:64px;}
.products-intro h2{margin:0 0 22px;}
.products-intro p{font-size:18px;line-height:1.6;color:#52514c;margin:0;}
.cats{display:grid;grid-template-columns:repeat(2,1fr);gap:20px;}
.cat{padding:34px 34px 36px;background:#fff;border:1px solid #ecebe7;border-radius:14px;box-shadow:0 1px 3px rgba(20,20,19,0.04);}
.cat-head{display:flex;align-items:baseline;gap:14px;margin-bottom:22px;}
.cat-head .num{font-family:'Archivo',sans-serif;font-weight:700;font-size:13px;color:#141413;}
.cat-head h3{font-weight:700;font-size:21px;letter-spacing:-0.01em;}
.chips{display:flex;flex-wrap:wrap;gap:8px;}
.chip{font-size:13px;color:#3a3934;padding:6px 12px;background:#f3f2ee;border-radius:999px;}
.faq-block{margin-top:84px;}
.faq-block h3{font-weight:800;font-size:26px;letter-spacing:-0.015em;margin-bottom:36px;}
.faqs{display:grid;grid-template-columns:repeat(2,1fr);gap:48px 64px;}
.faq h4{font-weight:700;font-size:16px;letter-spacing:0.01em;margin-bottom:12px;padding-left:18px;border-left:2px solid #141413;}
.faq p{font-size:15px;line-height:1.62;color:#6b6a64;margin:0;padding-left:18px;}

/* contacts */
.contact-grid{display:grid;grid-template-columns:1fr 1fr;gap:72px;align-items:start;}
.contact-info h2{margin:0 0 36px;}
.info-cards{display:flex;flex-direction:column;gap:14px;}
.info-card{padding:22px 24px;background:#fff;border:1px solid #ecebe7;border-radius:12px;}
.info-card .k{font-size:12px;font-weight:600;letter-spacing:0.14em;text-transform:uppercase;color:#9a988f;margin-bottom:8px;}
.info-card .v{font-size:16px;line-height:1.55;color:#3a3934;}
.info-card .v.strong{font-weight:600;color:#141413;}
.info-card.row{display:flex;gap:48px;flex-wrap:wrap;}
.info-card a{color:#3a3934;transition:color .15s;}
.info-card a:hover{color:#141413;}

/* form */
.contact-form{background:#fff;border:1px solid #e3e1db;border-radius:14px;padding:38px 36px;box-shadow:0 1px 3px rgba(20,20,19,0.04);}
.form-title{font-family:'Archivo',sans-serif;font-weight:700;font-size:18px;margin-bottom:24px;}
.form-fields{display:flex;flex-direction:column;gap:18px;}
.field label{display:block;}
.field .lbl{display:block;font-size:12px;font-weight:600;letter-spacing:0.08em;text-transform:uppercase;color:#9a988f;margin-bottom:7px;}
.field input,.field textarea{width:100%;padding:13px 14px;border-radius:8px;border:1px solid #d8d6cf;font-size:15px;color:#141413;background:#fff;outline:none;transition:border-color .15s;}
.field input:focus,.field textarea:focus{border-color:#141413;}
.field textarea{resize:vertical;}
.form-submit{margin-top:6px;border-radius:8px;padding:15px;background:#141413;color:#fff;border:none;font-size:14px;font-weight:600;letter-spacing:0.04em;text-transform:uppercase;cursor:pointer;transition:opacity .15s;}
.form-submit:hover{opacity:.85;}
.hidden-field{position:absolute;left:-9999px;}
.form-success{display:none;padding:40px 0;text-align:center;}
.form-success .tt{font-family:'Archivo',sans-serif;font-weight:800;font-size:22px;margin-bottom:10px;}
.form-success p{font-size:15px;color:#6b6a64;margin:0;}
.sent .contact-form-body{display:none;}
.sent .form-success{display:block;}

/* footer */
.site-footer{background:#141413;color:#cfcdc4;}
.footer-inner{padding:56px 32px 40px;max-width:1240px;margin:0 auto;}
.footer-top{display:flex;justify-content:space-between;align-items:flex-start;gap:40px;flex-wrap:wrap;padding-bottom:36px;border-bottom:1px solid #2c2c29;}
.footer-top .brand-mark{background:#fff;width:28px;height:28px;}
.footer-top .brand-mark span{background:#141413;width:10px;height:10px;}
.footer-top .brand-name{font-size:17px;color:#fff;}
.footer-nav{display:flex;gap:30px;flex-wrap:wrap;}
.footer-nav a{font-size:14px;color:#a8a69e;transition:color .15s;}
.footer-nav a:hover{color:#fff;}
.footer-bottom{display:flex;justify-content:space-between;gap:24px;flex-wrap:wrap;padding-top:24px;}
.footer-bottom .addr{font-size:13px;line-height:1.6;color:#7d7c75;max-width:520px;}
.footer-bottom .copy{font-size:13px;color:#7d7c75;}

/* responsive */
@media (max-width:880px){
  .desktop-nav{display:none;}
  .burger{display:flex;}
  .hero-grid{grid-template-columns:1fr;}
  .hero-text{padding:64px 0 56px;}
  .hero-media{min-height:300px;border-left:none;border-top:1px solid #ebeae7;}
  .strip-inner{grid-template-columns:1fr 1fr;}
  .about-head{grid-template-columns:1fr;gap:32px;}
  .pillars{grid-template-columns:1fr;}
  .steps{grid-template-columns:1fr 1fr;}
  .cats{grid-template-columns:1fr;}
  .faqs{grid-template-columns:1fr;}
  .contact-grid{grid-template-columns:1fr;}
}
@media (max-width:560px){
  .wrap{padding:0 22px;}
  .section{padding:72px 0;}
  .strip-inner{grid-template-columns:1fr;}
  .steps{grid-template-columns:1fr;}
}