/* ============================================================
   BURSA OPTİK — DEMO/MOCKUP
   Moda editorial optik: siyah-beyaz + kobalt (#1d4ed8)
   ============================================================ */

:root{
  --ink:#0b0b0c;
  --ink-soft:#3f3f46;
  --muted:#52525b;
  --paper:#fafafa;
  --white:#ffffff;
  --line:#e4e4e7;
  --line-dark:#27272a;
  --cobalt:#1d4ed8;
  --cobalt-deep:#1e40af;
  --font-display:"Manrope",system-ui,sans-serif;
  --font-body:"Inter",system-ui,sans-serif;
  --ease:cubic-bezier(.22,.61,.2,1);
}

*,*::before,*::after{box-sizing:border-box}
html{overflow-x:clip;scroll-behavior:smooth}
body{
  margin:0;
  font-family:var(--font-body);
  font-size:1rem;
  line-height:1.65;
  color:var(--ink);
  background:var(--paper);
  -webkit-font-smoothing:antialiased;
}
[id]{scroll-margin-top:96px}
img{max-width:100%;height:auto;display:block}
a{color:inherit}
h1,h2,h3,h4{font-family:var(--font-display);line-height:1.08;margin:0 0 .6em;letter-spacing:-.02em}
p{margin:0 0 1em}
::selection{background:var(--cobalt);color:#fff}

/* ---------- skip link ---------- */
.skip-link{
  position:absolute;left:-999px;top:0;z-index:200;
  background:var(--cobalt);color:#fff;padding:12px 20px;
  font-weight:600;text-decoration:none;
}
.skip-link:focus{left:8px;top:8px}

/* ---------- scroll progress ---------- */
.progress{
  position:fixed;top:0;left:0;height:3px;width:0;
  background:var(--cobalt);z-index:120;
}

/* ---------- header ---------- */
.site-header{
  position:sticky;top:0;z-index:100;
  background:rgba(250,250,250,.88);
  backdrop-filter:blur(14px);
  -webkit-backdrop-filter:blur(14px);
  border-bottom:1px solid var(--line);
}
.header-inner{
  max-width:1280px;margin:0 auto;padding:0 24px;
  display:flex;align-items:center;justify-content:space-between;
  min-height:76px;gap:16px;
}
.brand{
  display:flex;align-items:center;gap:12px;
  text-decoration:none;font-family:var(--font-display);
  min-height:44px;
}
.brand svg{flex:none}
.brand-name{font-weight:800;font-size:1.12rem;letter-spacing:.14em;text-transform:uppercase}
.brand-name em{font-style:normal;font-weight:300;color:var(--cobalt)}
.brand-sub{display:block;font-size:.6rem;letter-spacing:.34em;font-weight:500;color:var(--muted);text-transform:uppercase}

.main-nav{display:flex;align-items:center;gap:4px}
.main-nav a{
  display:inline-flex;align-items:center;
  min-height:44px;padding:10px 14px;
  text-decoration:none;font-size:.86rem;font-weight:500;
  letter-spacing:.05em;color:var(--ink-soft);
  border-bottom:2px solid transparent;
  transition:color .2s var(--ease);
}
.main-nav a:hover{color:var(--ink)}
.main-nav a[aria-current="page"]{color:var(--cobalt);border-bottom-color:var(--cobalt);font-weight:700}
.nav-cta{
  display:inline-flex;align-items:center;gap:8px;
  min-height:44px;padding:10px 20px;margin-left:10px;
  background:var(--ink);color:#fff !important;
  text-decoration:none;font-size:.85rem;font-weight:600;
  letter-spacing:.04em;border-bottom:none !important;
  transition:background .2s var(--ease);
}
.nav-cta:hover{background:var(--cobalt)}

.nav-toggle{
  display:none;
  width:48px;height:48px;padding:0;border:1px solid var(--line);
  background:transparent;cursor:pointer;align-items:center;justify-content:center;
}
.nav-toggle span,
.nav-toggle span::before,
.nav-toggle span::after{
  display:block;width:22px;height:2px;background:var(--ink);
  position:relative;transition:transform .25s var(--ease),opacity .2s;
  content:"";
}
.nav-toggle span::before{position:absolute;top:-7px}
.nav-toggle span::after{position:absolute;top:7px}
.nav-toggle[aria-expanded="true"] span{transform:rotate(45deg)}
.nav-toggle[aria-expanded="true"] span::before{transform:rotate(-90deg);top:0}
.nav-toggle[aria-expanded="true"] span::after{opacity:0}

@media (max-width:900px){
  .nav-toggle{display:inline-flex}
  .main-nav{
    position:absolute;top:100%;left:0;right:0;
    flex-direction:column;align-items:stretch;gap:0;
    background:var(--paper);border-bottom:1px solid var(--line);
    padding:8px 16px 20px;display:none;
  }
  .main-nav.open{display:flex}
  .main-nav a{min-height:48px;border-bottom:1px solid var(--line);font-size:1rem}
  .main-nav a[aria-current="page"]{border-bottom-color:var(--cobalt)}
  .nav-cta{margin:14px 0 0;justify-content:center}
}

/* ---------- layout helpers ---------- */
.wrap{max-width:1280px;margin:0 auto;padding:0 24px}
.wrap-narrow{max-width:880px;margin:0 auto;padding:0 24px}
section{padding:96px 0}
@media (max-width:700px){section{padding:64px 0}}

.kicker{
  display:inline-flex;align-items:center;gap:10px;
  font-size:.74rem;font-weight:700;letter-spacing:.32em;
  text-transform:uppercase;color:var(--cobalt);margin-bottom:20px;
}
.kicker::before{content:"";width:34px;height:1px;background:var(--cobalt)}

.display-xl{
  font-size:clamp(2.6rem,7vw,5.6rem);
  font-weight:200;letter-spacing:-.03em;
}
.display-l{font-size:clamp(2rem,4.6vw,3.6rem);font-weight:250;letter-spacing:-.025em}
.display-m{font-size:clamp(1.5rem,3vw,2.2rem);font-weight:300}
.display-xl strong,.display-l strong{font-weight:800}
.accent{color:var(--cobalt)}
.lede{font-size:1.12rem;color:var(--muted);max-width:58ch}

/* ---------- buttons ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:10px;
  min-height:52px;padding:14px 30px;
  font-family:var(--font-body);font-size:.95rem;font-weight:600;letter-spacing:.03em;
  text-decoration:none;cursor:pointer;
  transition:background .2s var(--ease),color .2s var(--ease),border-color .2s var(--ease);
  border:1px solid var(--ink);
}
.btn-dark{background:var(--ink);color:#fff}
.btn-dark:hover{background:var(--cobalt);border-color:var(--cobalt)}
.btn-ghost{background:transparent;color:var(--ink)}
.btn-ghost:hover{border-color:var(--cobalt);color:var(--cobalt)}
.btn-light{background:#fff;color:var(--ink);border-color:#fff}
.btn-light:hover{background:var(--cobalt);color:#fff;border-color:var(--cobalt)}

/* ---------- hero ---------- */
.hero{
  position:relative;overflow:clip;
  background:var(--ink);color:#fff;
  padding:0;
}
.hero-media{
  position:absolute;inset:-12% 0;
  z-index:0;will-change:transform;
}
.hero-media img{
  width:100%;height:100%;object-fit:cover;
  filter:grayscale(1) contrast(1.05);
  opacity:.5;
}
.hero-media::after{
  content:"";position:absolute;inset:0;
  background:linear-gradient(100deg,rgba(5,5,8,.92) 22%,rgba(5,5,8,.55) 58%,rgba(29,78,216,.28) 100%);
}
.hero-inner{
  position:relative;z-index:1;
  max-width:1280px;margin:0 auto;padding:150px 24px 120px;
  min-height:min(88vh,860px);
  display:flex;flex-direction:column;justify-content:center;
}
.hero h1{max-width:16ch}
.hero .lede{color:#d4d4d8}
.hero-actions{display:flex;flex-wrap:wrap;gap:14px;margin-top:36px}
.hero-meta{
  margin-top:64px;display:flex;flex-wrap:wrap;gap:28px;
  font-size:.8rem;letter-spacing:.18em;text-transform:uppercase;color:#a1a1aa;
}
.hero-meta span{display:flex;align-items:center;gap:10px}
.hero-meta span::before{content:"";width:6px;height:6px;background:var(--cobalt);border-radius:50%}

/* sub-page hero */
.page-hero{
  background:var(--ink);color:#fff;position:relative;overflow:clip;
  padding:120px 0 80px;
}
.page-hero .lede{color:#d4d4d8}
.page-hero .ghost-word{
  position:absolute;right:-2%;bottom:-6%;z-index:0;pointer-events:none;
  font-family:var(--font-display);font-weight:800;
  font-size:clamp(6rem,20vw,17rem);line-height:1;letter-spacing:-.04em;
  color:transparent;-webkit-text-stroke:1px rgba(255,255,255,.12);
  white-space:nowrap;user-select:none;
}
.page-hero .wrap{position:relative;z-index:1}
.page-hero .ghost-word,.hero .ghost-word{will-change:transform}
.hero .hero-ghost{
  position:absolute;right:-1%;bottom:-4%;z-index:0;pointer-events:none;
  font-family:var(--font-display);font-weight:800;
  font-size:clamp(7rem,22vw,19rem);line-height:1;letter-spacing:-.04em;
  color:transparent;-webkit-text-stroke:1px rgba(255,255,255,.14);
  white-space:nowrap;user-select:none;
}

/* ---------- marquee ---------- */
.marquee{
  overflow:clip;border-top:1px solid var(--line-dark);border-bottom:1px solid var(--line-dark);
  background:var(--ink);color:#fff;padding:18px 0;
}
.marquee-track{
  display:flex;gap:0;width:max-content;
  animation:marquee 26s linear infinite;
}
.marquee-seq{
  display:flex;align-items:center;flex:none;
  font-family:var(--font-display);font-weight:300;
  font-size:clamp(1rem,2.2vw,1.5rem);letter-spacing:.28em;text-transform:uppercase;
  white-space:nowrap;
}
.marquee-seq i{
  font-style:normal;color:var(--cobalt);margin:0 26px;font-size:.8em;
}
@keyframes marquee{to{transform:translateX(-50%)}}
.marquee.light{background:var(--paper);color:var(--ink);border-color:var(--line)}

/* ---------- category / product cards ---------- */
.grid-2{display:grid;grid-template-columns:repeat(2,1fr);gap:28px}
.grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:28px}
.grid-4{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}
@media (max-width:1000px){.grid-4{grid-template-columns:repeat(2,1fr)}.grid-3{grid-template-columns:repeat(2,1fr)}}
@media (max-width:640px){.grid-2,.grid-3,.grid-4{grid-template-columns:1fr}}

.cat-card{
  position:relative;display:flex;flex-direction:column;gap:18px;
  padding:34px 28px;background:#fff;border:1px solid var(--line);
  text-decoration:none;min-height:44px;
  transition:border-color .25s var(--ease),transform .25s var(--ease),box-shadow .25s var(--ease);
}
.cat-card:hover{border-color:var(--cobalt);transform:translateY(-4px);box-shadow:0 18px 40px -24px rgba(29,78,216,.35)}
.cat-card .frame-illo{color:var(--ink);transition:color .25s var(--ease)}
.cat-card:hover .frame-illo{color:var(--cobalt)}
.cat-card h3{margin:0;font-size:1.2rem;font-weight:700}
.cat-card p{margin:0;color:var(--muted);font-size:.94rem}
.cat-card .cat-idx{
  position:absolute;top:22px;right:24px;
  font-family:var(--font-display);font-weight:200;font-size:1.6rem;color:#d4d4d8;
  transition:color .25s var(--ease);
}
.cat-card:hover .cat-idx{color:var(--cobalt)}
.cat-link{
  margin-top:auto;display:inline-flex;align-items:center;gap:8px;
  font-size:.85rem;font-weight:700;letter-spacing:.08em;text-transform:uppercase;color:var(--ink);
  transition:color .2s;min-height:24px;
}
.cat-card:hover .cat-link{color:var(--cobalt)}
.cat-link svg{transition:transform .25s var(--ease)}
.cat-card:hover .cat-link svg{transform:translateX(5px)}

.product-card{
  background:#fff;border:1px solid var(--line);
  padding:26px 24px 22px;display:flex;flex-direction:column;gap:14px;
  transition:border-color .25s var(--ease),transform .25s var(--ease),box-shadow .25s var(--ease);
}
.product-card:hover{border-color:var(--cobalt);transform:translateY(-4px);box-shadow:0 18px 40px -24px rgba(29,78,216,.35)}
.product-card .frame-illo{color:var(--ink);margin:6px auto 2px;transition:color .25s var(--ease),transform .3s var(--ease)}
.product-card:hover .frame-illo{color:var(--cobalt);transform:scale(1.04)}
.product-card h4{margin:0;font-size:1.02rem;font-weight:700;text-align:center}
.product-card .p-meta{
  display:flex;justify-content:center;gap:10px;
  font-size:.78rem;color:var(--muted);letter-spacing:.06em;text-transform:uppercase;
}
.product-card .p-note{
  margin:0;text-align:center;font-size:.74rem;letter-spacing:.14em;
  text-transform:uppercase;color:var(--cobalt);font-weight:600;
}

/* ---------- stats ---------- */
.stats{
  display:grid;grid-template-columns:repeat(4,1fr);gap:24px;
  border-top:1px solid var(--line-dark);
}
@media (max-width:900px){.stats{grid-template-columns:repeat(2,1fr)}}
.stat{padding:32px 8px 0}
.stat b{
  display:block;font-family:var(--font-display);font-weight:200;
  font-size:clamp(2.4rem,5vw,4rem);letter-spacing:-.02em;line-height:1;
}
.stat b .plus{color:var(--cobalt);font-weight:400}
.stat span{display:block;margin-top:10px;font-size:.82rem;letter-spacing:.2em;text-transform:uppercase;color:#a1a1aa}

/* ---------- editorial split ---------- */
.split{display:grid;grid-template-columns:1.05fr .95fr;gap:64px;align-items:center}
@media (max-width:940px){.split{grid-template-columns:1fr;gap:40px}}
.figure{position:relative}
.figure-media{position:relative;display:block}
.figure img{
  width:100%;filter:grayscale(1) contrast(1.04);
  transition:filter .5s var(--ease);
}
.figure:hover img{filter:grayscale(0) contrast(1)}
.figure-media::after{
  content:"";position:absolute;inset:auto -14px -14px auto;
  width:56%;height:56%;border:1px solid var(--cobalt);z-index:-1;
}
.figure figcaption{
  margin-top:20px;font-size:.76rem;letter-spacing:.18em;text-transform:uppercase;color:var(--muted);
}

/* ---------- service list (editorial numbered) ---------- */
.svc{
  display:grid;grid-template-columns:110px 1fr auto;gap:28px;align-items:start;
  padding:40px 0;border-top:1px solid var(--line);
}
.svc:last-child{border-bottom:1px solid var(--line)}
.svc-num{
  font-family:var(--font-display);font-weight:200;
  font-size:clamp(2rem,4vw,3.2rem);color:#d4d4d8;line-height:1;
  transition:color .3s var(--ease);
}
.svc:hover .svc-num{color:var(--cobalt)}
.svc h3{font-size:1.35rem;font-weight:700;margin-bottom:.4em}
.svc p{color:var(--muted);max-width:62ch;margin:0}
.svc-icon{color:var(--ink);transition:color .3s var(--ease)}
.svc:hover .svc-icon{color:var(--cobalt)}
@media (max-width:760px){
  .svc{grid-template-columns:64px 1fr;gap:18px}
  .svc-icon{display:none}
}

/* ---------- tech / lens articles ---------- */
.tech-block{
  display:grid;grid-template-columns:.9fr 1.1fr;gap:56px;align-items:center;
  padding:72px 0;border-top:1px solid var(--line);
}
.tech-block:nth-of-type(even){grid-template-columns:1.1fr .9fr}
.tech-block:nth-of-type(even) .tech-visual{order:2}
@media (max-width:900px){
  .tech-block,.tech-block:nth-of-type(even){grid-template-columns:1fr;gap:32px}
  .tech-block:nth-of-type(even) .tech-visual{order:0}
}
.tech-visual{
  background:#fff;border:1px solid var(--line);padding:36px;
  display:flex;align-items:center;justify-content:center;
}
.tech-visual svg{width:100%;max-width:420px;height:auto}
.tech-body h3{font-size:clamp(1.5rem,2.6vw,2rem);font-weight:300}
.tech-body h3 strong{font-weight:800}
.tech-body ul{margin:18px 0 0;padding:0;list-style:none;display:grid;gap:10px}
.tech-body li{
  display:flex;gap:12px;align-items:baseline;color:var(--ink-soft);font-size:.96rem;
}
.tech-body li::before{content:"";flex:none;width:16px;height:1px;background:var(--cobalt);transform:translateY(-4px)}

/* ---------- gallery ---------- */
.gallery{display:grid;grid-template-columns:repeat(3,1fr);gap:20px}
@media (max-width:800px){.gallery{grid-template-columns:1fr}}
.gallery figure{margin:0;position:relative;overflow:clip;border:1px solid var(--line);background:#fff}
.gallery img{
  width:100%;height:100%;object-fit:cover;aspect-ratio:3/4;
  filter:grayscale(1);transition:filter .5s var(--ease),transform .6s var(--ease);
}
.gallery figure:hover img{filter:grayscale(0);transform:scale(1.03)}
.gallery figcaption{
  position:absolute;left:0;right:0;bottom:0;
  padding:14px 16px;background:linear-gradient(transparent,rgba(0,0,0,.72));
  color:#fff;font-size:.8rem;letter-spacing:.14em;text-transform:uppercase;
}

/* ---------- CTA band ---------- */
.cta-band{background:var(--cobalt);color:#fff;text-align:center}
.cta-band h2{font-weight:250}
.cta-band h2 strong{font-weight:800}
.cta-band .lede{color:#dbeafe;margin:0 auto 34px}
.cta-band .btn{border-color:#fff}

/* ---------- contact ---------- */
.contact-grid{display:grid;grid-template-columns:1fr 1.1fr;gap:56px;align-items:start}
@media (max-width:900px){.contact-grid{grid-template-columns:1fr}}
.info-list{display:grid;gap:0;border-top:1px solid var(--line)}
.info-item{
  display:flex;gap:18px;align-items:flex-start;
  padding:24px 0;border-bottom:1px solid var(--line);
}
.info-item svg{flex:none;color:var(--cobalt);margin-top:3px}
.info-item b{display:block;font-size:.78rem;letter-spacing:.2em;text-transform:uppercase;color:var(--muted);margin-bottom:4px;font-weight:600}
.info-item a{color:var(--ink);text-decoration:none;font-weight:600;display:inline-flex;align-items:center;min-height:24px}
.info-item a:hover{color:var(--cobalt)}
.hours{width:100%;border-collapse:collapse;font-size:.94rem}
.hours td{padding:6px 0;border:none}
.hours td:last-child{text-align:right;color:var(--muted)}

.form{display:grid;gap:18px;background:#fff;border:1px solid var(--line);padding:36px}
.form-row{display:grid;grid-template-columns:1fr 1fr;gap:18px}
@media (max-width:600px){.form-row{grid-template-columns:1fr}}
.field{display:grid;gap:8px}
.field label{font-size:.8rem;font-weight:700;letter-spacing:.1em;text-transform:uppercase}
.field input,.field select,.field textarea{
  font:inherit;color:var(--ink);background:var(--paper);
  border:1px solid var(--line);padding:13px 14px;min-height:48px;width:100%;
  transition:border-color .2s;border-radius:0;
}
.field textarea{min-height:140px;resize:vertical}
.field input:focus,.field select:focus,.field textarea:focus{
  outline:2px solid var(--cobalt);outline-offset:-1px;border-color:var(--cobalt);
}
.form-note{font-size:.8rem;color:var(--muted);margin:0}
.map-frame{border:1px solid var(--line);background:#fff;padding:10px}
.map-frame iframe{display:block;width:100%;height:420px;border:0;filter:grayscale(1) contrast(1.04)}
.map-frame:hover iframe{filter:none}

/* ---------- SGK band ---------- */
.notice-band{
  display:flex;flex-wrap:wrap;gap:24px;align-items:center;justify-content:space-between;
  background:var(--ink);color:#fff;padding:40px 44px;
}
.notice-band h3{margin:0;font-weight:300;font-size:clamp(1.3rem,2.4vw,1.8rem)}
.notice-band h3 strong{font-weight:800;color:#93b4ff}
.notice-band p{margin:6px 0 0;color:#a1a1aa;max-width:60ch}

/* ---------- footer ---------- */
.site-footer{background:var(--ink);color:#a1a1aa;margin-top:0}
.footer-top{
  max-width:1280px;margin:0 auto;padding:72px 24px 48px;
  display:grid;grid-template-columns:1.4fr 1fr 1fr 1.2fr;gap:44px;
}
@media (max-width:960px){.footer-top{grid-template-columns:1fr 1fr}}
@media (max-width:560px){.footer-top{grid-template-columns:1fr}}
.footer-brand{font-family:var(--font-display);color:#fff}
.footer-brand .brand-name{font-size:1.3rem}
.footer-brand p{color:#a1a1aa;font-family:var(--font-body);font-size:.92rem;max-width:34ch;margin-top:14px}
.site-footer h4{
  color:#fff;font-size:.78rem;letter-spacing:.26em;text-transform:uppercase;
  font-weight:700;margin-bottom:18px;
}
.site-footer ul{list-style:none;margin:0;padding:0;display:grid;gap:6px}
.site-footer li a{
  color:#a1a1aa;text-decoration:none;display:inline-flex;align-items:center;
  min-height:34px;transition:color .2s;font-size:.94rem;
}
.site-footer li a:hover{color:#fff}
.footer-contact p{margin:0 0 10px;font-size:.94rem}
.footer-contact a{color:#e4e4e7;text-decoration:none;font-weight:600}
.footer-contact a:hover{color:#fff}
.footer-bottom{border-top:1px solid var(--line-dark)}
.footer-bottom .wrap{
  display:flex;flex-wrap:wrap;gap:12px;align-items:center;justify-content:space-between;
  padding-top:22px;padding-bottom:22px;font-size:.8rem;
}
.footer-bottom .demo-tag{
  color:#fbbf24;letter-spacing:.14em;text-transform:uppercase;font-weight:600;
}

/* ---------- reveal ---------- */
.reveal{opacity:0;transform:translateY(26px);transition:opacity .7s var(--ease),transform .7s var(--ease)}
.reveal.in{opacity:1;transform:none}
.reveal-stagger>*{opacity:0;transform:translateY(26px);transition:opacity .6s var(--ease),transform .6s var(--ease)}
.reveal-stagger.in>*{opacity:1;transform:none}
.reveal-stagger.in>*:nth-child(2){transition-delay:.08s}
.reveal-stagger.in>*:nth-child(3){transition-delay:.16s}
.reveal-stagger.in>*:nth-child(4){transition-delay:.24s}
.reveal-stagger.in>*:nth-child(5){transition-delay:.32s}
.reveal-stagger.in>*:nth-child(6){transition-delay:.4s}
.reveal-stagger.in>*:nth-child(7){transition-delay:.48s}
.reveal-stagger.in>*:nth-child(8){transition-delay:.56s}

/* ---------- focus ---------- */
a:focus-visible,button:focus-visible{outline:2px solid var(--cobalt);outline-offset:3px}

/* ---------- reduced motion ---------- */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{animation-duration:.001s !important;transition-duration:.001s !important}
  .marquee-track{animation:none;width:auto}
  .hero-media{position:absolute;inset:0;transform:none !important}
  [data-plx]{transform:none !important}
  .reveal,.reveal-stagger>*{opacity:1;transform:none}
}