/* ==========================================================================
   TUDA ÇELİK HALAT — site stili
   Tasarım dili: gerçek çelik tel dokusu ve fotoğrafik endüstriyel yön —
   antrasit zemin, sıcak steel-haki vurgu, serif başlık + sade gövde yazısı.
   ========================================================================== */

:root{
  --ink:#1c1b17;
  --ink-soft:#34322a;
  --steel:#6f6d5e;
  --steel-light:#cfc9b3;
  --blue:#a9a58c;
  --blue-deep:#4a4736;
  --blue-pale:#efece1;
  --paper:#f4f2ea;
  --white:#ffffff;
  --line:#e4e0d2;

  --font-head:'Instrument Serif', 'Georgia', serif;
  --font-body:'Work Sans', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-mono:'JetBrains Mono', 'SFMono-Regular', Consolas, monospace;

  --container:1180px;
  --radius:2px;
}

*,*::before,*::after{box-sizing:border-box;}
html{scroll-behavior:smooth;}
body{
  margin:0;
  font-family:var(--font-body);
  color:var(--ink);
  background:var(--paper);
  line-height:1.6;
  -webkit-font-smoothing:antialiased;
}
img{max-width:100%;display:block;}
a{color:inherit;text-decoration:none;}
ul{margin:0;padding:0;list-style:none;}
h1,h2,h3,h4{
  font-family:var(--font-head);
  line-height:1.15;
  margin:0 0 .5em;
  font-weight:400;
  letter-spacing:0;
}
p{margin:0 0 1em;}
:focus-visible{outline:3px solid var(--blue);outline-offset:2px;}

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

@media (prefers-reduced-motion: reduce){
  html{scroll-behavior:auto;}
  *{animation-duration:.001ms !important; transition-duration:.001ms !important;}
}

/* ---------------------------------------------------------------- woven texture */
.weave-strip{
  height:10px;
  width:100%;
  background-image:repeating-linear-gradient(
    115deg,
    var(--blue) 0px, var(--blue) 3px,
    transparent 3px, transparent 18px
  );
  background-color:var(--ink);
  opacity:.9;
}
.weave-bg{
  position:relative;
  overflow:hidden;
}
.weave-bg::before{
  content:"";
  position:absolute;
  inset:0;
  background-image:
    repeating-linear-gradient(115deg, rgba(169,165,140,.16) 0px, rgba(169,165,140,.16) 2px, transparent 2px, transparent 26px),
    repeating-linear-gradient(65deg, rgba(255,255,255,.06) 0px, rgba(255,255,255,.06) 2px, transparent 2px, transparent 26px);
  pointer-events:none;
}

/* ---------------------------------------------------------------- header */
.site-header{
  position:sticky;
  top:0;
  z-index:100;
  background:var(--white);
  border-bottom:1px solid var(--line);
}
.header-inner{
  display:flex;
  align-items:center;
  justify-content:space-between;
  padding:10px 24px;
  gap:24px;
}
.brand{
  display:flex;
  align-items:center;
  gap:12px;
  flex-shrink:0;
}
.brand img{height:84px;width:auto;}
.brand-text{
  font-family:var(--font-head);
  font-size:12px;
  color:var(--steel);
  letter-spacing:.02em;
  line-height:1.3;
}
.brand-text strong{
  display:block;
  font-size:15px;
  color:var(--ink);
}

.main-nav{display:flex;align-items:center;gap:4px;}
.main-nav a{
  padding:10px 16px;
  font-size:15px;
  font-weight:500;
  color:var(--ink-soft);
  border-radius:var(--radius);
  transition:color .15s ease, background .15s ease;
}
.main-nav a:hover{color:var(--blue-deep); background:var(--blue-pale);}
.main-nav a[aria-current="page"]{color:var(--blue-deep); font-weight:600;}

.header-cta{
  display:flex;
  align-items:center;
  gap:14px;
}
.header-phone{
  font-family:var(--font-mono);
  font-size:14px;
  color:var(--ink-soft);
  white-space:nowrap;
}

.nav-toggle{
  display:none;
  background:none;
  border:1.5px solid var(--line);
  padding:8px 10px;
  border-radius:var(--radius);
  cursor:pointer;
}
.nav-toggle span, .nav-toggle span::before, .nav-toggle span::after{
  content:"";
  display:block;
  width:20px;
  height:2px;
  background:var(--ink);
  position:relative;
  transition:transform .2s ease;
}
.nav-toggle span::before{position:absolute; top:-6px;}
.nav-toggle span::after{position:absolute; top:6px;}

/* ---------------------------------------------------------------- buttons */
.btn{
  display:inline-flex;
  align-items:center;
  gap:8px;
  padding:13px 24px;
  font-family:var(--font-body);
  font-weight:600;
  font-size:15px;
  border-radius:var(--radius);
  border:1.5px solid transparent;
  cursor:pointer;
  transition:transform .15s ease, background .15s ease, border-color .15s ease, color .15s ease;
}
.btn:hover{transform:translateY(-1px);}
.btn-primary{background:var(--blue); color:var(--ink);}
.btn-primary:hover{background:var(--blue-deep); color:var(--white);}
.btn-dark{background:var(--ink); color:var(--white);}
.btn-dark:hover{background:var(--ink-soft);}
.btn-outline{border-color:var(--ink); color:var(--ink); background:transparent;}
.btn-outline:hover{background:var(--ink); color:var(--white);}
.btn-outline-light{border-color:rgba(255,255,255,.5); color:var(--white); background:transparent;}
.btn-outline-light:hover{background:var(--white); color:var(--ink);}
.btn-sm{padding:9px 16px; font-size:13.5px;}

/* ---------------------------------------------------------------- hero */
.hero{
  background:var(--ink);
  color:var(--white);
  position:relative;
}
.hero-inner{
  display:flex;
  align-items:stretch;
  min-height:600px;
  position:relative;
  z-index:1;
}
.hero-content{
  flex:0 1 560px;
  max-width:560px;
  width:100%;
  margin-left:max(24px, calc((100vw - 1180px) / 2));
  padding:88px 48px 76px 0;
  display:flex;
  flex-direction:column;
  justify-content:center;
}
.eyebrow-plain{
  font-size:15px;
  color:var(--blue);
  font-weight:600;
  margin-bottom:14px;
}
.hero h1{
  font-size:clamp(34px, 4vw, 50px);
  color:var(--white);
  max-width:15ch;
}
.hero-sub{
  font-size:17px;
  color:#c9c6b4;
  max-width:46ch;
  margin-bottom:32px;
}
.hero-actions{display:flex; gap:14px; flex-wrap:wrap; margin-bottom:44px;}
.hero-stats{
  display:flex;
  gap:0;
  border-top:1px solid rgba(255,255,255,.16);
  padding-top:24px;
}
.hero-stats div{
  padding-right:26px;
  margin-right:26px;
  border-right:1px solid rgba(255,255,255,.16);
}
.hero-stats div:last-child{border-right:none;margin-right:0;}
.hero-stats strong{
  display:block;
  font-family:var(--font-head);
  font-size:20px;
  color:var(--white);
}
.hero-stats span{
  font-size:12.5px;
  color:#9a9686;
}

.hero-photo{
  flex:1;
  position:relative;
  overflow:hidden;
  min-width:280px;
}
.hero-photo img{
  position:absolute;
  inset:0;
  width:100%;
  height:100%;
  object-fit:cover;
  display:block;
}
.hero-photo .ph-fallback{
  position:absolute;
  inset:0;
  display:flex;
  flex-direction:column;
  align-items:center;
  justify-content:center;
  gap:10px;
  font-family:var(--font-mono);
  font-size:12.5px;
  color:var(--blue);
  text-align:center;
  padding:24px;
  background:
    repeating-linear-gradient(115deg, rgba(169,165,140,.16) 0px, rgba(169,165,140,.16) 2px, transparent 2px, transparent 22px),
    #26251f;
}
.hero-photo .fade-edge{
  position:absolute;
  inset:0;
  background:linear-gradient(90deg, var(--ink) 0%, rgba(28,27,23,.4) 12%, rgba(28,27,23,0) 30%);
  pointer-events:none;
}


/* ---------------------------------------------------------------- breadcrumb */
.breadcrumb{
  padding:16px 0;
  font-size:13.5px;
  color:var(--steel);
  border-bottom:1px solid var(--line);
}
.breadcrumb a:hover{color:var(--blue-deep);}
.breadcrumb .sep{margin:0 8px; color:var(--steel-light);}
.breadcrumb .current{color:var(--ink);}

/* ---------------------------------------------------------------- page hero (inner pages) */
.page-hero{
  background:var(--ink);
  color:var(--white);
  padding:56px 0 60px;
  position:relative;
}
.page-hero .kicker{color:var(--blue); font-weight:600; font-size:14px; margin-bottom:10px;}
.page-hero h1{color:var(--white); font-size:clamp(30px,4vw,44px); max-width:22ch;}
.page-hero p{color:#c9c6b4; max-width:56ch; font-size:17px; margin-top:14px;}

/* ---------------------------------------------------------------- sections */
section{padding:88px 0;}
.section-tight{padding:64px 0;}
.section-head{
  max-width:640px;
  margin-bottom:48px;
}
.section-head h2{font-size:clamp(26px,3vw,36px);}
.section-head p{color:var(--steel); font-size:16.5px;}
.on-dark{background:var(--ink); color:var(--white);}
.on-dark h2{color:var(--white);}
.on-dark .section-head p{color:#b8b39f;}
.on-pale{background:var(--blue-pale);}

/* ---------------------------------------------------------------- feature grid */
.feature-grid{
  display:grid;
  grid-template-columns:repeat(3, 1fr);
  gap:1px;
  background:var(--line);
  border:1px solid var(--line);
}
.feature-card{
  background:var(--white);
  padding:32px 28px;
}
.feature-card .icon{
  width:40px;height:40px;
  margin-bottom:18px;
  color:var(--blue-deep);
}
.feature-card h3{font-size:18px;}
.feature-card p{color:var(--steel); font-size:15px; margin-bottom:0;}

/* ---------------------------------------------------------------- product grid */
.product-grid{
  display:grid;
  grid-template-columns:repeat(3, 1fr);
  gap:28px;
}
.product-card{
  background:var(--white);
  border:1px solid var(--line);
  clip-path:polygon(0 0, 100% 0, 100% calc(100% - 22px), calc(100% - 22px) 100%, 0 100%);
  display:flex;
  flex-direction:column;
  transition:border-color .15s ease, transform .15s ease;
}
.product-card:hover{border-color:var(--blue); transform:translateY(-3px);}
.product-thumb{
  aspect-ratio:4/3;
  background:
    linear-gradient(135deg, var(--blue-pale) 0%, #e6e2d2 100%);
  position:relative;
  display:flex;
  align-items:flex-end;
  overflow:hidden;
}
.product-thumb img{width:100%; height:100%; object-fit:cover; position:absolute; inset:0;}
.product-thumb .ph-fallback{
  position:relative;
  z-index:1;
  padding:16px;
  width:100%;
  display:flex;
  align-items:center;
  justify-content:space-between;
  font-family:var(--font-mono);
  font-size:11.5px;
  color:var(--blue-deep);
  background:repeating-linear-gradient(115deg, rgba(74,71,54,.14) 0px, rgba(74,71,54,.14) 2px, transparent 2px, transparent 20px);
}
.product-body{
  padding:22px 24px 26px;
  display:flex;
  flex-direction:column;
  flex:1;
}
.product-tag{
  font-size:12px;
  color:var(--blue-deep);
  font-weight:600;
  margin-bottom:8px;
}
.product-card h3{font-size:19px; margin-bottom:8px;}
.product-card p{color:var(--steel); font-size:14.5px; margin-bottom:18px;}
.product-link{
  margin-top:auto;
  font-weight:600;
  font-size:14.5px;
  color:var(--ink);
  display:inline-flex;
  align-items:center;
  gap:6px;
}
.product-link svg{width:14px;height:14px;}
.product-card:hover .product-link{color:var(--blue-deep);}

/* ---------------------------------------------------------------- spec table */
.spec-table{
  width:100%;
  border-collapse:collapse;
  font-size:15px;
}
.spec-table tr{border-bottom:1px solid var(--line);}
.spec-table tr:last-child{border-bottom:none;}
.spec-table th,.spec-table td{
  text-align:left;
  padding:14px 4px;
  vertical-align:top;
}
.spec-table th{
  width:38%;
  font-weight:500;
  color:var(--steel);
  font-family:var(--font-body);
}
.spec-table td{
  font-family:var(--font-mono);
  font-size:14px;
  color:var(--ink);
}

/* ---------------------------------------------------------------- product detail layout */
.product-detail{
  display:grid;
  grid-template-columns:1fr 1fr;
  gap:56px;
  align-items:start;
}
.product-gallery-main{
  aspect-ratio:4/3;
  background:linear-gradient(135deg, var(--blue-pale) 0%, #e6e2d2 100%);
  border:1px solid var(--line);
  position:relative;
  overflow:hidden;
  clip-path:polygon(0 0, 100% 0, 100% calc(100% - 30px), calc(100% - 30px) 100%, 0 100%);
}
.product-gallery-main img{width:100%;height:100%;object-fit:cover;position:absolute;inset:0;}
.product-gallery-main .ph-fallback{
  position:absolute; inset:0;
  display:flex; flex-direction:column; align-items:center; justify-content:center; gap:10px;
  font-family:var(--font-mono);
  font-size:12.5px;
  color:var(--blue-deep);
  text-align:center;
  padding:24px;
  background:repeating-linear-gradient(115deg, rgba(74,71,54,.14) 0px, rgba(74,71,54,.14) 2px, transparent 2px, transparent 20px);
}
.product-gallery-thumbs{
  display:grid;
  grid-template-columns:repeat(4,1fr);
  gap:10px;
  margin-top:12px;
}
.product-gallery-thumbs div{
  aspect-ratio:1/1;
  background:var(--blue-pale);
  border:1px solid var(--line);
  position:relative;
  overflow:hidden;
}
.product-gallery-thumbs img{width:100%;height:100%;object-fit:cover;position:absolute;inset:0;}

.badge-row{display:flex; gap:8px; flex-wrap:wrap; margin-bottom:18px;}
.badge{
  font-size:12.5px;
  font-weight:600;
  color:var(--blue-deep);
  background:var(--blue-pale);
  padding:6px 12px;
  border-radius:20px;
}

.usage-list li{
  position:relative;
  padding-left:22px;
  margin-bottom:10px;
  color:var(--ink-soft);
}
.usage-list li::before{
  content:"";
  position:absolute;
  left:0; top:9px;
  width:8px;height:2px;
  background:var(--blue);
}

.detail-note{
  margin-top:28px;
  padding:16px 18px;
  background:var(--paper);
  border-left:3px solid var(--blue);
  font-size:14px;
  color:var(--steel);
}

/* ---------------------------------------------------------------- related products */
.related-strip{
  display:grid;
  grid-template-columns:repeat(3,1fr);
  gap:24px;
}

/* ---------------------------------------------------------------- process steps */
.process-list{
  display:grid;
  grid-template-columns:repeat(4,1fr);
  gap:0;
  counter-reset:step;
}
.process-step{
  padding:0 24px 0 0;
  border-right:1px solid var(--line);
  margin-right:24px;
}
.process-step:last-child{border-right:none;margin-right:0;padding-right:0;}
.process-step .num{
  font-family:var(--font-head);
  font-size:34px;
  color:var(--blue);
  margin-bottom:12px;
}
.process-step h3{font-size:16.5px;}
.process-step p{color:var(--steel); font-size:14px; margin-bottom:0;}

/* ---------------------------------------------------------------- about */
.about-grid{
  display:grid;
  grid-template-columns:1fr 1fr;
  gap:56px;
  align-items:center;
}
.about-figure{
  aspect-ratio:5/4;
  background:var(--ink);
  position:relative;
  overflow:hidden;
}
.value-grid{
  display:grid;
  grid-template-columns:repeat(2,1fr);
  gap:24px;
  margin-top:40px;
}
.value-item h3{font-size:17px; display:flex; align-items:center; gap:10px;}
.value-item h3 .dot{width:8px;height:8px;background:var(--blue);flex-shrink:0;}
.value-item p{color:var(--steel); font-size:14.5px;}

/* ---------------------------------------------------------------- CTA band */
.cta-band{
  background:var(--blue);
  color:var(--ink);
  padding:56px 0;
}
.cta-inner{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:24px;
  flex-wrap:wrap;
}
.cta-inner h2{font-size:clamp(22px,2.6vw,30px); margin-bottom:6px;}
.cta-inner p{margin-bottom:0; color:var(--ink-soft);}

/* ---------------------------------------------------------------- contact */
.contact-grid{
  display:grid;
  grid-template-columns:.9fr 1.1fr;
  gap:56px;
  align-items:start;
}
.contact-info-item{
  display:flex;
  gap:16px;
  padding:20px 0;
  border-bottom:1px solid var(--line);
}
.contact-info-item:first-child{padding-top:0;}
.contact-info-item .icon{
  width:22px;height:22px;
  color:var(--blue-deep);
  flex-shrink:0;
  margin-top:2px;
}
.contact-info-item h3{font-size:15px; margin-bottom:4px;}
.contact-info-item p{color:var(--steel); font-size:14.5px; margin-bottom:0;}
.contact-info-item a:hover{color:var(--blue-deep);}

.contact-map{
  margin-top:8px;
  border:1px solid var(--line);
  filter:grayscale(.15) contrast(1.02);
}
.contact-map iframe{display:block;}
.map-link{
  display:inline-block;
  margin-top:10px;
  font-size:13.5px;
  font-weight:600;
  color:var(--blue-deep);
}
.map-link:hover{color:var(--ink);}

.form-grid{
  display:grid;
  grid-template-columns:1fr 1fr;
  gap:18px;
}
.form-grid .full{grid-column:1/-1;}
.field label{
  display:block;
  font-size:13.5px;
  font-weight:600;
  margin-bottom:7px;
  color:var(--ink-soft);
}
.field input, .field select, .field textarea{
  width:100%;
  padding:12px 14px;
  border:1.5px solid var(--line);
  border-radius:var(--radius);
  font-family:var(--font-body);
  font-size:15px;
  background:var(--white);
  color:var(--ink);
}
.field input:focus, .field select:focus, .field textarea:focus{
  border-color:var(--blue);
  outline:none;
}
.field textarea{resize:vertical; min-height:120px;}
.form-note{font-size:13px; color:var(--steel); margin-top:14px;}

/* ---------------------------------------------------------------- footer */
.site-footer{
  background:var(--ink);
  color:#b8b39f;
  padding-top:64px;
}
.footer-grid{
  display:grid;
  grid-template-columns:1.3fr 1fr 1fr 1.1fr;
  gap:40px;
  padding-bottom:48px;
  border-bottom:1px solid rgba(255,255,255,.12);
}
.footer-brand{display:flex; gap:12px; align-items:center; margin-bottom:16px;}
.footer-brand img{height:68px;}
.footer-brand strong{color:var(--white); font-family:var(--font-head); font-size:16px;}
.footer-col h4{
  color:var(--white);
  font-size:14px;
  font-family:var(--font-body);
  font-weight:600;
  margin-bottom:16px;
}
.footer-col ul li{margin-bottom:10px; font-size:14.5px;}
.footer-col a:hover{color:var(--blue);}
.footer-bottom{
  display:flex;
  justify-content:space-between;
  align-items:center;
  padding:24px 0;
  font-size:13px;
  color:#86816d;
  flex-wrap:wrap;
  gap:12px;
}

/* ---------------------------------------------------------------- responsive */
@media (max-width: 980px){
  .hero-inner{flex-direction:column;}
  .hero-content{max-width:100%; margin-left:0; padding:44px 24px 36px;}
  .hero-photo{min-height:280px;}
  .hero-photo .fade-edge{background:linear-gradient(180deg, var(--ink) 0%, rgba(28,27,23,.3) 12%, rgba(28,27,23,0) 34%);}
  .feature-grid{grid-template-columns:1fr;}
  .product-grid{grid-template-columns:repeat(2,1fr);}
  .product-detail{grid-template-columns:1fr;}
  .about-grid{grid-template-columns:1fr;}
  .value-grid{grid-template-columns:1fr;}
  .contact-grid{grid-template-columns:1fr;}
  .process-list{grid-template-columns:repeat(2,1fr); row-gap:32px;}
  .process-step{border-right:none; margin-right:0; padding-right:0;}
  .footer-grid{grid-template-columns:1fr 1fr;}
  .related-strip{grid-template-columns:1fr;}
}
@media (max-width: 700px){
  .main-nav{
    position:absolute;
    top:100%; left:0; right:0;
    background:var(--white);
    flex-direction:column;
    align-items:stretch;
    padding:8px 16px 16px;
    border-bottom:1px solid var(--line);
    display:none;
  }
  .main-nav.open{display:flex;}
  .main-nav a{padding:12px 8px; border-bottom:1px solid var(--line);}
  .nav-toggle{display:block;}
  .header-phone{display:none;}
  .product-grid{grid-template-columns:1fr;}
  .form-grid{grid-template-columns:1fr;}
  .form-grid .field{grid-column:1/-1;}
  .footer-grid{grid-template-columns:1fr;}
  .cta-inner{flex-direction:column; align-items:flex-start;}
  .hero-stats{flex-wrap:wrap; gap:16px 0;}
  .hero-stats div{margin-right:20px; padding-right:20px;}
}