/* =========================================================
   ETERP — Design System
   Tokens: navy/blue industrial palette, Space Grotesk display,
   Inter body, IBM Plex Mono for data/serial/barcode elements.
   ========================================================= */

:root{
  --navy-950:#070f22;
  --navy-900:#0b1f3a;
  --navy-800:#122a4d;
  --navy-700:#173562;
  --blue-600:#1e5fd9;
  --blue-500:#2f6fef;
  --blue-400:#5f8fff;
  --cyan-400:#3fa9f5;
  --ink:#0f1622;
  --slate-600:#465269;
  --slate-500:#5b6b82;
  --slate-300:#a8b6cc;
  --paper:#f5f8fc;
  --paper-dim:#eef2f9;
  --white:#ffffff;
  --line:#e1e8f2;
  --line-dark:#22385f;
  --ok:#1fb571;

  --font-display:'Space Grotesk', 'Segoe UI', sans-serif;
  --font-body:'Inter', 'Segoe UI', sans-serif;
  --font-mono:'IBM Plex Mono', 'Courier New', monospace;

  --radius-s:4px;
  --radius-m:8px;
  --radius-l:16px;
  --maxw:1180px;
}

*,*::before,*::after{box-sizing:border-box;}
html{scroll-behavior:smooth;}
body{
  margin:0;
  font-family:var(--font-body);
  color:var(--ink);
  background:var(--paper);
  -webkit-font-smoothing:antialiased;
  line-height:1.6;
}
img{max-width:100%;display:block;}
a{color:inherit;text-decoration:none;}
ul,ol{margin:0;padding:0;}
li{list-style:none;}
h1,h2,h3,h4{font-family:var(--font-display);margin:0;letter-spacing:-0.01em;color:var(--navy-900);}
p{margin:0;}
button{font-family:inherit;cursor:pointer;}

.wrap{max-width:var(--maxw);margin:0 auto;padding:0 24px;}

:focus-visible{outline:3px solid var(--cyan-400);outline-offset:2px;}

@media (prefers-reduced-motion: reduce){
  *{animation-duration:0.01ms !important;animation-iteration-count:1 !important;transition-duration:0.01ms !important;scroll-behavior:auto !important;}
}

/* ---------- Barcode rule (signature divider) ---------- */
.barcode-rule{
  height:28px;
  width:100%;
  background-repeat:repeat-x;
  background-size:auto 100%;
  background-image:repeating-linear-gradient(
    90deg,
    var(--navy-900) 0px, var(--navy-900) 2px,
    transparent 2px, transparent 5px,
    var(--navy-900) 5px, var(--navy-900) 6px,
    transparent 6px, transparent 11px,
    var(--navy-900) 11px, var(--navy-900) 14px,
    transparent 14px, transparent 17px,
    var(--navy-900) 17px, var(--navy-900) 18px,
    transparent 18px, transparent 24px
  );
  opacity:0.08;
}
.barcode-rule.light{opacity:0.14;background-image:repeating-linear-gradient(
    90deg,
    var(--white) 0px, var(--white) 2px,
    transparent 2px, transparent 5px,
    var(--white) 5px, var(--white) 6px,
    transparent 6px, transparent 11px,
    var(--white) 11px, var(--white) 14px,
    transparent 14px, transparent 17px,
    var(--white) 17px, var(--white) 18px,
    transparent 18px, transparent 24px
  );}

/* ---------- Header ---------- */
.site-header{
  position:sticky;top:0;z-index:100;
  background:rgba(11,31,58,0.96);
  backdrop-filter:blur(8px);
  border-bottom:1px solid var(--line-dark);
}
.site-header .wrap{display:flex;align-items:center;justify-content:space-between;height:76px;}
.logo{font-family:var(--font-display);font-weight:700;font-size:22px;color:var(--white);display:flex;align-items:center;gap:10px;}
.logo .dot{width:9px;height:9px;background:var(--cyan-400);border-radius:2px;display:inline-block;}
.logo small{font-family:var(--font-mono);font-size:11px;color:var(--slate-300);font-weight:400;letter-spacing:0.06em;margin-left:6px;}
nav.main-nav{display:flex;align-items:center;gap:28px;}
nav.main-nav a{color:var(--slate-300);font-size:14.5px;font-weight:500;transition:color .15s;}
nav.main-nav a:hover{color:var(--white);}
.nav-cta{display:flex;align-items:center;gap:12px;}
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:12px 22px;border-radius:var(--radius-s);
  font-weight:600;font-size:14.5px;border:1px solid transparent;
  transition:transform .12s ease, background .15s, border-color .15s, color .15s;
}
.btn:hover{transform:translateY(-1px);}
.btn-primary{background:var(--blue-600);color:var(--white);}
.btn-primary:hover{background:var(--blue-500);}
.btn-ghost{background:transparent;color:var(--white);border-color:rgba(255,255,255,0.28);}
.btn-ghost:hover{border-color:var(--white);}
.btn-ok{background:var(--ok);color:var(--white);}
.btn-ok:hover{background:#18a065;}
.btn-outline-navy{background:transparent;color:var(--navy-900);border-color:var(--line);}
.btn-outline-navy:hover{border-color:var(--blue-600);color:var(--blue-600);}
.menu-toggle{display:none;background:none;border:1px solid rgba(255,255,255,0.3);color:var(--white);border-radius:var(--radius-s);padding:8px 12px;}

/* ---------- Hero ---------- */
.hero{
  background:radial-gradient(1100px 520px at 78% -10%, #16346a 0%, var(--navy-900) 55%, var(--navy-950) 100%);
  color:var(--white);
  padding:88px 0 76px;
  position:relative;
  overflow:hidden;
}
.hero .wrap{display:grid;grid-template-columns:1.15fr 0.85fr;gap:56px;align-items:center;position:relative;z-index:2;}
.eyebrow{
  font-family:var(--font-mono);font-size:12.5px;letter-spacing:0.14em;text-transform:uppercase;
  color:var(--cyan-400);display:flex;align-items:center;gap:10px;margin-bottom:18px;
}
.eyebrow::before{content:"";width:20px;height:1px;background:var(--cyan-400);display:inline-block;}
.hero h1{font-size:clamp(32px,4.4vw,52px);line-height:1.08;color:var(--white);font-weight:600;}
.hero h1 .accent{color:var(--cyan-400);}
.hero .lead{margin-top:22px;font-size:18px;color:var(--slate-300);max-width:52ch;}
.hero .cta-row{margin-top:34px;display:flex;gap:14px;flex-wrap:wrap;}
.hero .trust-row{margin-top:44px;display:flex;gap:32px;flex-wrap:wrap;}
.hero .trust-row .stat b{font-family:var(--font-mono);font-size:26px;color:var(--white);display:block;}
.hero .trust-row .stat span{font-size:12.5px;color:var(--slate-300);}

/* Serial number counter card — signature element */
.serial-card{
  background:var(--navy-950);
  border:1px solid var(--line-dark);
  border-radius:var(--radius-l);
  padding:28px;
  box-shadow:0 30px 60px -20px rgba(0,0,0,0.55);
}
.serial-card .head{display:flex;justify-content:space-between;align-items:center;margin-bottom:18px;}
.serial-card .head span{font-family:var(--font-mono);font-size:11.5px;color:var(--slate-300);letter-spacing:0.08em;text-transform:uppercase;}
.serial-card .live{display:flex;align-items:center;gap:6px;font-family:var(--font-mono);font-size:11px;color:var(--ok);}
.serial-card .live i{width:7px;height:7px;background:var(--ok);border-radius:50%;display:inline-block;animation:pulse 1.6s infinite;}
@keyframes pulse{0%,100%{opacity:1;}50%{opacity:.35;}}
.serial-readout{
  font-family:var(--font-mono);
  font-size:clamp(28px,4vw,38px);
  color:var(--white);
  letter-spacing:0.05em;
  border-top:1px dashed var(--line-dark);
  border-bottom:1px dashed var(--line-dark);
  padding:20px 0;
  text-align:center;
}
.serial-readout .prefix{color:var(--cyan-400);}
.serial-card .fields{margin-top:18px;display:grid;grid-template-columns:1fr 1fr;gap:12px;}
.serial-card .fields div{background:var(--navy-900);border:1px solid var(--line-dark);border-radius:var(--radius-s);padding:10px 12px;}
.serial-card .fields div label{display:block;font-family:var(--font-mono);font-size:10px;color:var(--slate-500);text-transform:uppercase;letter-spacing:0.06em;}
.serial-card .fields div output{font-family:var(--font-mono);font-size:14px;color:var(--white);}

/* ---------- Sections ---------- */
section{padding:88px 0;}
.section-head{max-width:640px;margin-bottom:52px;}
.section-head .eyebrow{color:var(--blue-600);}
.section-head h2{font-size:clamp(26px,3.2vw,38px);font-weight:600;}
.section-head p{margin-top:16px;color:var(--slate-500);font-size:16.5px;}
.on-navy .section-head .eyebrow{color:var(--cyan-400);}
.on-navy .section-head h2{color:var(--white);}
.on-navy .section-head p{color:var(--slate-300);}

.services-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:22px;}
.service-card{
  background:var(--white);border:1px solid var(--line);border-radius:var(--radius-m);
  padding:28px;transition:border-color .15s, transform .15s, box-shadow .15s;
  display:flex;flex-direction:column;gap:14px;
}
.service-card:hover{border-color:var(--blue-400);transform:translateY(-3px);box-shadow:0 20px 40px -24px rgba(11,31,58,0.35);}
.service-card .idx{font-family:var(--font-mono);font-size:12px;color:var(--slate-500);}
.service-card h3{font-size:19px;font-weight:600;}
.service-card p{color:var(--slate-500);font-size:14.5px;}
.service-card .go{margin-top:auto;font-size:13.5px;font-weight:600;color:var(--blue-600);display:flex;align-items:center;gap:6px;}

.process{display:grid;grid-template-columns:repeat(5,1fr);gap:0;position:relative;}
.process .step{padding:0 18px 0 0;position:relative;}
.process .step .n{font-family:var(--font-mono);font-size:13px;color:var(--cyan-400);border:1px solid var(--line-dark);width:34px;height:34px;border-radius:50%;display:flex;align-items:center;justify-content:center;margin-bottom:16px;}
.process .step h4{color:var(--white);font-size:16px;margin-bottom:8px;}
.process .step p{color:var(--slate-300);font-size:13.5px;}
.process .step:not(:last-child)::after{content:"";position:absolute;top:17px;left:44px;right:0;height:1px;background:var(--line-dark);}

.two-col{display:grid;grid-template-columns:1fr 1fr;gap:56px;align-items:center;}
.checklist li{display:flex;gap:12px;padding:10px 0;border-bottom:1px solid var(--line);font-size:15px;color:var(--slate-600);}
.checklist li:last-child{border-bottom:none;}
.checklist li .ck{color:var(--ok);font-family:var(--font-mono);font-weight:700;}

.logos-row{display:flex;gap:40px;flex-wrap:wrap;align-items:center;justify-content:space-between;opacity:0.7;}
.logos-row div{font-family:var(--font-mono);font-size:13px;color:var(--slate-500);border:1px dashed var(--line);padding:14px 22px;border-radius:var(--radius-s);}

.faq-item{border-bottom:1px solid var(--line);padding:22px 0;}
.faq-item summary{cursor:pointer;font-weight:600;font-size:16px;color:var(--navy-900);list-style:none;display:flex;justify-content:space-between;align-items:center;gap:16px;}
.faq-item summary::-webkit-details-marker{display:none;}
.faq-item summary::after{content:"+";font-family:var(--font-mono);font-size:20px;color:var(--blue-600);flex-shrink:0;}
.faq-item[open] summary::after{content:"–";}
.faq-item .a{margin-top:14px;color:var(--slate-500);font-size:15px;line-height:1.7;}

.specs-table{width:100%;border-collapse:collapse;font-size:14.5px;}
.specs-table th{text-align:left;font-family:var(--font-mono);font-size:11.5px;text-transform:uppercase;letter-spacing:0.06em;color:var(--slate-500);padding:12px 16px;border-bottom:1px solid var(--line);}
.specs-table td{padding:14px 16px;border-bottom:1px solid var(--line);color:var(--slate-600);}
.specs-table tr:hover td{background:var(--paper-dim);}

.cta-band{background:linear-gradient(120deg,var(--navy-900),var(--navy-700));color:var(--white);border-radius:var(--radius-l);padding:52px;display:flex;justify-content:space-between;align-items:center;gap:32px;flex-wrap:wrap;}
.cta-band h3{color:var(--white);font-size:26px;}
.cta-band p{color:var(--slate-300);margin-top:8px;}

.breadcrumb{font-family:var(--font-mono);font-size:12.5px;color:var(--slate-500);padding:20px 0 0;}
.breadcrumb a{color:var(--blue-600);}
.breadcrumb span{margin:0 6px;color:var(--slate-300);}

.page-hero{background:var(--navy-900);color:var(--white);padding:56px 0 64px;}
.page-hero h1{color:var(--white);font-size:clamp(28px,3.6vw,42px);}
.page-hero p{color:var(--slate-300);margin-top:16px;max-width:60ch;font-size:16.5px;}
.kw-tags{display:flex;flex-wrap:wrap;gap:8px;margin-top:22px;}
.kw-tags span{font-family:var(--font-mono);font-size:11.5px;border:1px solid var(--line-dark);color:var(--cyan-400);padding:5px 10px;border-radius:20px;}

.content-block{max-width:820px;}
.content-block h2{font-size:26px;margin-top:8px;margin-bottom:14px;}
.content-block h3{font-size:19px;margin-top:28px;margin-bottom:10px;color:var(--navy-900);}
.content-block p{color:var(--slate-600);font-size:16px;margin-bottom:14px;}
.content-block ul{margin:14px 0 20px 0;}
.content-block ul li{color:var(--slate-600);font-size:15.5px;padding:6px 0 6px 22px;position:relative;}
.content-block ul li::before{content:"—";position:absolute;left:0;color:var(--blue-600);}

.usecase-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:16px;}
.usecase-grid div{background:var(--white);border:1px solid var(--line);border-radius:var(--radius-m);padding:20px;}
.usecase-grid div .tag{font-family:var(--font-mono);font-size:11px;color:var(--blue-600);text-transform:uppercase;letter-spacing:0.05em;}
.usecase-grid div p{margin-top:8px;font-size:14.5px;color:var(--slate-600);}

.blog-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:24px;}
.blog-card{background:var(--white);border:1px solid var(--line);border-radius:var(--radius-m);padding:26px;}
.blog-card .meta{font-family:var(--font-mono);font-size:11px;color:var(--slate-500);text-transform:uppercase;letter-spacing:0.05em;}
.blog-card h3{margin-top:10px;font-size:18px;}
.blog-card p{margin-top:10px;color:var(--slate-500);font-size:14.5px;}
.blog-card .kws{margin-top:14px;display:flex;gap:6px;flex-wrap:wrap;}
.blog-card .kws span{font-size:11px;font-family:var(--font-mono);background:var(--paper-dim);padding:4px 8px;border-radius:4px;color:var(--slate-600);}

/* ---------- Footer ---------- */
footer.site-footer{background:var(--navy-950);color:var(--slate-300);padding:64px 0 28px;}
.footer-grid{display:grid;grid-template-columns:1.4fr 1fr 1fr 1fr;gap:40px;}
.footer-grid h4{color:var(--white);font-size:13px;font-family:var(--font-mono);text-transform:uppercase;letter-spacing:0.06em;margin-bottom:18px;}
.footer-grid a{display:block;color:var(--slate-300);font-size:14.5px;padding:6px 0;transition:color .15s;}
.footer-grid a:hover{color:var(--cyan-400);}
.footer-brand p{color:var(--slate-300);font-size:14.5px;max-width:34ch;margin-top:14px;}
.footer-bottom{margin-top:52px;padding-top:24px;border-top:1px solid var(--line-dark);display:flex;justify-content:space-between;flex-wrap:wrap;gap:12px;font-size:13px;color:var(--slate-500);}

/* ---------- WhatsApp floating button ---------- */
.wa-float{
  position:fixed;bottom:24px;right:24px;z-index:200;
  display:flex;align-items:center;gap:10px;
  background:var(--ok);color:var(--white);
  padding:14px 20px;border-radius:50px;
  font-weight:600;font-size:14px;
  box-shadow:0 12px 30px -8px rgba(31,181,113,0.55);
  transition:transform .15s;
}
.wa-float:hover{transform:translateY(-2px) scale(1.02);}
.wa-float svg{width:20px;height:20px;flex-shrink:0;}

/* ---------- Forms ---------- */
.form-card{background:var(--white);border:1px solid var(--line);border-radius:var(--radius-l);padding:36px;}
.form-row{display:grid;grid-template-columns:1fr 1fr;gap:16px;margin-bottom:16px;}
.form-field{display:flex;flex-direction:column;gap:8px;}
.form-field.full{grid-column:1 / -1;}
.form-field label{font-size:13px;font-weight:600;color:var(--navy-900);}
.form-field input,.form-field select,.form-field textarea{
  border:1px solid var(--line);border-radius:var(--radius-s);padding:12px 14px;font-family:inherit;font-size:14.5px;color:var(--ink);background:var(--paper);
}
.form-field input:focus,.form-field select:focus,.form-field textarea:focus{border-color:var(--blue-500);outline:none;background:var(--white);}
.contact-info-card{background:var(--navy-900);color:var(--white);border-radius:var(--radius-l);padding:36px;}
.contact-info-card .row{display:flex;gap:14px;padding:16px 0;border-bottom:1px solid var(--line-dark);}
.contact-info-card .row:last-child{border-bottom:none;}
.contact-info-card .row b{display:block;font-size:14.5px;}
.contact-info-card .row span{font-size:13.5px;color:var(--slate-300);}
.map-frame{border-radius:var(--radius-m);overflow:hidden;border:1px solid var(--line-dark);height:220px;margin-top:20px;}

/* ---------- Legal pages ---------- */
.legal-block{max-width:780px;}
.legal-block h2{font-size:20px;margin-top:36px;margin-bottom:12px;}
.legal-block p, .legal-block li{color:var(--slate-600);font-size:15px;margin-bottom:10px;}
.legal-block ul{margin-left:4px;}
.legal-block ul li{padding-left:20px;position:relative;}
.legal-block ul li::before{content:"•";position:absolute;left:0;color:var(--blue-600);}

/* ---------- Responsive ---------- */
@media (max-width:960px){
  .hero .wrap{grid-template-columns:1fr;}
  .two-col{grid-template-columns:1fr;}
  .services-grid{grid-template-columns:repeat(2,1fr);}
  .footer-grid{grid-template-columns:1fr 1fr;}
  .process{grid-template-columns:repeat(3,1fr);row-gap:32px;}
  .process .step::after{display:none;}
  .usecase-grid{grid-template-columns:1fr;}
  .blog-grid{grid-template-columns:1fr;}
}
@media (max-width:680px){
  nav.main-nav{display:none;}
  .menu-toggle{display:inline-flex;}
  .services-grid{grid-template-columns:1fr;}
  .process{grid-template-columns:1fr 1fr;}
  .form-row{grid-template-columns:1fr;}
  .cta-band{flex-direction:column;text-align:center;}
  .footer-grid{grid-template-columns:1fr;}
}

/* ---------- Barkod Oluşturma Aracı ---------- */
.tool-grid{display:grid;grid-template-columns:0.95fr 1.05fr;gap:28px;align-items:start;}
.tool-panel{background:var(--white);border:1px solid var(--line);border-radius:var(--radius-l);padding:32px;}
.tool-panel h2{font-size:20px;margin-bottom:22px;}
.tool-field{margin-bottom:18px;}
.tool-field label{display:block;font-size:13px;font-weight:600;color:var(--navy-900);margin-bottom:8px;}
.tool-field select,.tool-field textarea,.tool-field input[type=text]{
  width:100%;border:1px solid var(--line);border-radius:var(--radius-s);padding:12px 14px;
  font-family:inherit;font-size:14.5px;color:var(--ink);background:var(--paper);
}
.tool-field select:focus,.tool-field textarea:focus{border-color:var(--blue-500);outline:none;background:var(--white);}
.tool-field textarea{resize:vertical;min-height:64px;font-family:var(--font-mono);}
.tool-hint{margin-top:8px;font-size:12.5px;color:var(--slate-500);}
.tool-row2{display:grid;grid-template-columns:1fr 1fr;gap:16px;}
.tool-range-label{display:flex;justify-content:space-between;font-size:13px;font-weight:600;color:var(--navy-900);margin-bottom:8px;}
.tool-range-label span{font-family:var(--font-mono);color:var(--blue-600);font-weight:500;}
.tool-check{display:flex;align-items:center;gap:10px;font-size:14px;color:var(--slate-600);}
.tool-colors{display:flex;gap:20px;align-items:center;}
.tool-colors label{display:flex;align-items:center;gap:8px;font-size:13px;color:var(--slate-600);}
.tool-colors input[type=color]{width:36px;height:36px;border:1px solid var(--line);border-radius:var(--radius-s);padding:2px;background:var(--white);}
.tool-error{display:none;margin-top:16px;padding:14px 16px;border-radius:var(--radius-s);background:#fdeceb;color:#b3261e;font-size:13.5px;border:1px solid #f3c6c2;}

.tool-subhead{font-size:12px;font-weight:700;text-transform:uppercase;letter-spacing:0.06em;color:var(--slate-500);margin:22px 0 14px;padding-top:18px;border-top:1px solid var(--line);}
.tool-field-group{transition:opacity .15s;}
.tool-field-group.is-disabled{opacity:0.4;}
.tool-field-group.is-disabled select,.tool-field-group.is-disabled input{pointer-events:none;}
.tool-field select:disabled,.tool-field input:disabled{opacity:0.55;cursor:not-allowed;}

/* OCR-B: lisanslı bir font dosyası eklendiğinde (assets/fonts/OCR-B.woff2 ve
   assets/fonts/OCR-B.woff) otomatik olarak devreye girer; dosya yoksa
   tarayıcı sorunsuzca aşağıdaki monospace yedek fontlara geçer. */
@font-face{
  font-family:"OCR-B";
  src:url("assets/fonts/OCR-B.woff2") format("woff2"),
      url("assets/fonts/OCR-B.woff") format("woff");
  font-weight:400 700;
  font-display:swap;
}

.preview-panel{background:var(--navy-900);border-radius:var(--radius-l);padding:32px;position:sticky;top:24px;}
.preview-panel h3{color:var(--white);font-size:15px;font-family:var(--font-mono);text-transform:uppercase;letter-spacing:0.06em;margin-bottom:18px;}
.preview-box{background:var(--white);border-radius:var(--radius-m);padding:28px;min-height:180px;display:flex;align-items:center;justify-content:center;overflow:auto;}
.preview-box canvas{max-width:100%;height:auto;}
.preview-filename{margin-top:14px;font-family:var(--font-mono);font-size:12px;color:var(--slate-300);text-align:center;word-break:break-word;}
.download-grid{display:grid;grid-template-columns:repeat(5,1fr);gap:8px;margin-top:22px;}
.dl-btn{display:flex;flex-direction:column;align-items:center;gap:6px;padding:14px 6px;background:var(--navy-800);border:1px solid var(--line-dark);border-radius:var(--radius-m);color:var(--white);font-size:12px;font-weight:600;transition:background .15s,transform .15s;}
.dl-btn:hover{background:var(--blue-600);transform:translateY(-2px);}
.dl-btn.is-disabled{opacity:0.35;pointer-events:none;}
.dl-btn svg{width:20px;height:20px;}
.preview-note{margin-top:16px;font-size:12px;color:var(--slate-300);line-height:1.6;}

.format-groups{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;margin-top:8px;}
.format-groups .fg{background:var(--white);border:1px solid var(--line);border-radius:var(--radius-m);padding:20px;}
.format-groups .fg h4{font-size:14px;color:var(--blue-600);margin-bottom:10px;}
.format-groups .fg ul li{font-size:13.5px;color:var(--slate-600);padding:4px 0;}

@media (max-width:960px){
  .tool-grid{grid-template-columns:1fr;}
  .preview-panel{position:static;}
  .download-grid{grid-template-columns:repeat(3,1fr);}
  .format-groups{grid-template-columns:1fr 1fr;}
}
@media (max-width:680px){
  .tool-row2{grid-template-columns:1fr;}
  .download-grid{grid-template-columns:repeat(2,1fr);}
  .format-groups{grid-template-columns:1fr;}
}