/* USK Mühendislik — "koyu teknik" tema.
   Koyu bölümler (üst menü, giriş, sayfa başlıkları, yönetmelik şeridi, iletişim, alt bilgi) gece mavisi
   ve ince çizim ızgarası; içerik bölümleri açık zeminde beyaz kartlar; vurgu turkuaz. */
:root{
  --ink:#0F172A;          /* açık zeminde başlık ve metin */
  --body:#334155;         /* paragraflar */
  --muted:#64748B;        /* ikincil bilgi */
  --line:#E2E8F0;         /* çizgiler, kart kenarları */
  --paper:#FFFFFF;        /* kartlar */
  --page:#F8FAFC;         /* sayfa zemini */
  --stone:#F1F5F9;        /* alternatif bölüm zemini */
  --accent:#14B8A6;       /* turkuaz: düğmeler, koyu zeminde vurgu */
  --accent-hover:#2DD4BF;
  --accent-text:#0F766E;  /* açık zeminde turkuaz yazı (okunur kontrast) */
  --accent-soft:#5EEAD4;  /* koyu zeminde turkuaz yazı */
  --accent-tint:#F0FDFA;
  --on-accent:#042F2C;
  --night:#0B1220;        /* koyu bölümler */
  --night-2:#111A2E;      /* koyu paneller */
  --night-line:#1E293B;
  --night-line-2:#334155;
  --on-dark:#E2E8F0;
  --on-dark-muted:#94A3B8;
  --radius:16px;
  --shadow:0 1px 2px rgba(15,23,42,.04),0 8px 24px rgba(15,23,42,.06);
  --shadow-hover:0 2px 4px rgba(15,23,42,.06),0 16px 36px rgba(15,23,42,.10);
  --grid:linear-gradient(rgba(148,163,184,.07) 1px,transparent 1px),linear-gradient(90deg,rgba(148,163,184,.07) 1px,transparent 1px);
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;background:var(--page);color:var(--ink);font-family:'Manrope',system-ui,-apple-system,'Segoe UI',sans-serif;font-size:17px;line-height:1.65}
h1,h2,h3{font-family:'Manrope',system-ui,sans-serif;color:var(--ink);margin:0;letter-spacing:-0.02em}
h1{font-weight:800;font-size:clamp(36px,4.8vw,60px);line-height:1.06}
h2{font-weight:800;font-size:clamp(28px,3.1vw,42px);line-height:1.12}
h3{font-weight:700;font-size:21px;line-height:1.3}
p{margin:0;color:var(--body)}
a{color:var(--ink);text-decoration:none}
a:hover{color:var(--accent-text)}
img{max-width:100%;display:block}
input,select,textarea,button{font:inherit}
.wrap{max-width:1200px;margin:0 auto;padding:0 24px}
section[id]{scroll-margin-top:100px}
.section{padding:104px 0}
.stone{background:var(--stone)}
.lead{font-size:19px;max-width:600px}

/* etiket (hap) */
.kicker{display:inline-flex;align-items:center;width:fit-content;gap:8px;margin-bottom:16px;padding:5px 12px;border-radius:999px;background:var(--accent-tint);border:1px solid #CCFBF1;color:var(--accent-text);font-size:13px;font-weight:700;letter-spacing:.01em}

/* düğmeler */
.btn{display:inline-flex;align-items:center;justify-content:center;min-height:50px;padding:0 24px;border-radius:999px;background:var(--accent);color:var(--on-accent);font-weight:700;font-size:16px;border:1px solid var(--accent);transition:background .15s,border-color .15s,color .15s}
.btn:hover{background:var(--accent-hover);border-color:var(--accent-hover);color:var(--on-accent)}
.btn.ghost{background:transparent;color:var(--ink);border-color:#CBD5E1}
.btn.ghost:hover{background:var(--stone);color:var(--ink)}

/* koyu bölümler */
header,#top,.page-hero,.codes,#iletisim,#contact,footer{color:var(--on-dark)}
#top,.page-hero,#iletisim,#contact{background-color:var(--night);background-image:var(--grid);background-size:32px 32px}
#top h1,.page-hero h1,#iletisim h2,#contact h2{color:#fff}
#top p,.page-hero p,#iletisim p,#contact p{color:#CBD5E1}
#top .kicker,.page-hero .kicker,#iletisim .kicker,#contact .kicker{background:rgba(20,184,166,.08);border-color:#134E4A;color:var(--accent-soft)}
#top .btn.ghost,.page-hero .btn.ghost{color:var(--on-dark);border-color:var(--night-line-2)}
#top .btn.ghost:hover,.page-hero .btn.ghost:hover{background:rgba(255,255,255,.06);color:#fff}

/* üst menü */
header{position:sticky;top:0;z-index:10;background:rgba(11,18,32,.92);-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);border-bottom:1px solid var(--night-line)}
.bar{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:12px 28px;padding-top:22px;padding-bottom:22px}
.brand{display:flex;align-items:center;gap:14px}
.brand img{height:50px;width:auto;border-radius:4px}
.brand span{display:flex;flex-direction:column;line-height:1.2}
.brand b{font-weight:800;font-size:19px;color:#fff}
.brand small{font-size:13px;color:var(--on-dark-muted)}
nav{display:flex;flex-wrap:wrap;align-items:center;gap:4px 26px;font-size:16px;font-weight:600}
nav a{color:#CBD5E1}
nav a:hover,nav a[aria-current="page"]{color:#fff}
nav .btn{min-height:46px;padding:0 22px;font-size:16px}
nav a.lang{display:inline-flex;align-items:center;min-height:34px;padding:0 10px;border:1px solid var(--night-line-2);border-radius:999px;font-size:13px;letter-spacing:.04em;color:#CBD5E1}
.mobile-only{display:none}
.menu-toggle{width:44px;height:44px;border:1px solid var(--night-line-2);border-radius:12px;background:transparent;color:#fff;cursor:pointer;display:inline-flex;flex-direction:column;align-items:center;justify-content:center;gap:5px;padding:0}
.menu-toggle i{display:block;width:20px;height:2px;border-radius:2px;background:var(--on-dark);transition:transform .2s,opacity .2s}
header.open .menu-toggle i:nth-child(1){transform:translateY(7px) rotate(45deg)}
header.open .menu-toggle i:nth-child(2){opacity:0}
header.open .menu-toggle i:nth-child(3){transform:translateY(-7px) rotate(-45deg)}
.call{min-height:44px;padding:0 16px;font-size:15px}

/* giriş */
.hero{display:flex;flex-wrap:wrap;align-items:center;gap:56px;padding-top:96px;padding-bottom:104px}
.hero > div{flex:1 1 500px;min-width:0;display:flex;flex-direction:column;gap:24px}
.hero > div .kicker{margin-bottom:0}
.hero figure{flex:1 1 400px;min-width:0;margin:0;border:1px solid var(--night-line);background:var(--night-2);border-radius:var(--radius);padding:22px}
.hero figcaption{margin-top:12px;padding-top:12px;border-top:1px solid var(--night-line);font-size:13px;color:var(--on-dark-muted)}
.actions{display:flex;flex-wrap:wrap;gap:12px}

/* yönetmelik şeridi */
.codes{background:var(--night-2);border-top:1px solid var(--night-line);border-bottom:1px solid var(--night-line)}
.codes .wrap{display:flex;flex-wrap:wrap;align-items:center;gap:8px 28px;padding-top:18px;padding-bottom:18px;font-size:14px;font-weight:600;color:#CBD5E1}
.codes strong{color:var(--accent-soft);font-weight:700}
.codes a{color:#CBD5E1;border-bottom:1px solid #134E4A}
.codes a:hover{color:#fff;border-bottom-color:var(--accent)}

/* başlık satırı */
.head{display:flex;flex-wrap:wrap;justify-content:space-between;align-items:flex-end;gap:20px 48px;margin-bottom:48px}
.head > div{max-width:660px;display:flex;flex-direction:column}
.head > p{max-width:440px}

/* kartlar: hizmet ve yöntem */
.services{display:grid;grid-template-columns:repeat(auto-fit,minmax(320px,1fr));gap:24px}
.service,.method{border:1px solid var(--line);background:var(--paper);border-radius:var(--radius);box-shadow:var(--shadow);overflow:hidden;display:flex;flex-direction:column;transition:box-shadow .2s,transform .2s}
.service{padding:30px 28px;gap:12px}
.service:hover,.method:hover{box-shadow:var(--shadow-hover);transform:translateY(-2px)}
.service .tag,.ref{display:inline-flex;width:fit-content;padding:3px 10px;border-radius:999px;background:var(--accent-tint);color:var(--accent-text);font-size:12px;font-weight:700}
.service ul{margin:6px 0 0;padding:14px 0 0 18px;border-top:1px solid var(--line);font-size:15px;color:var(--body)}
.service li{margin:3px 0}
.service li::marker{color:var(--accent)}
.service .more{margin-top:auto;padding-top:8px;font-weight:700;font-size:15px;align-self:flex-start;color:var(--accent-text)}
.service .more:hover{color:var(--ink)}
.card-img{display:block;width:calc(100% + 56px);max-width:none;margin:-30px -28px 8px;height:auto;border-bottom:1px solid var(--line);background:var(--paper)}

/* hızlı tarama */
.split{display:flex;flex-wrap:wrap;gap:56px;align-items:center}
.split > div{flex:1 1 480px;min-width:0;display:flex;flex-direction:column;gap:20px}
.split > div .kicker{margin-bottom:0}
.who{flex:1 1 360px;min-width:0;display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:14px;margin:0;padding:0;list-style:none}
.who li{background:var(--paper);border:1px solid var(--line);border-radius:14px;box-shadow:var(--shadow);padding:22px;font-weight:700;position:relative;padding-left:44px}
.who li::before{content:"";position:absolute;left:22px;top:30px;width:10px;height:10px;border-radius:50%;background:var(--accent)}

/* süreç */
.steps{margin:0;padding:0;list-style:none;display:grid;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));gap:20px}
.steps li{background:var(--paper);border:1px solid var(--line);border-radius:14px;padding:22px;display:flex;flex-direction:column;gap:8px}
.steps .n{display:inline-flex;align-items:center;justify-content:center;width:38px;height:38px;border-radius:12px;background:var(--night);color:var(--accent-soft);font-weight:800;font-size:16px}
.steps b{font-size:18px;font-weight:700}
.steps span:last-child{font-size:15px;color:var(--body)}

/* projeler */
.projects{display:grid;grid-template-columns:repeat(auto-fit,minmax(300px,1fr));gap:28px}
.project{display:flex;flex-direction:column;gap:10px}
.ph{aspect-ratio:4/3;background:var(--stone);border:1.5px dashed #CBD5E1;border-radius:var(--radius);display:flex;align-items:center;justify-content:center;font-size:14px;color:var(--muted)}
.meta{display:flex;justify-content:space-between;gap:12px;font-size:13px;font-weight:600;color:var(--muted)}
.link{display:inline-flex;align-items:center;min-height:44px;font-weight:700;color:var(--accent-text)}

/* hakkımızda */
.about{display:flex;flex-wrap:wrap;gap:56px}
.about > div:first-child{flex:1 1 340px;min-width:0;display:flex;flex-direction:column;gap:16px}
.about > div:last-child{flex:1.4 1 500px;min-width:0;display:flex;flex-direction:column;gap:20px}
.about > div:last-child .kicker{margin-bottom:0}
.about .ph{aspect-ratio:4/5;max-width:400px}
.facts{margin:8px 0 0;display:grid;grid-template-columns:repeat(auto-fit,minmax(160px,1fr));gap:14px}
.facts > div{background:var(--paper);border:1px solid var(--line);border-radius:14px;padding:16px 18px}
.facts dt{font-size:13px;font-weight:600;color:var(--muted)}
.facts dd{margin:4px 0 0;font-weight:800;font-size:24px;color:var(--ink)}

/* sss */
.faq{display:flex;flex-wrap:wrap;gap:48px}
.faq > div:first-child{flex:1 1 300px;min-width:0;display:flex;flex-direction:column}
.faq > div:last-child{flex:2 1 540px;min-width:0;display:flex;flex-direction:column;gap:12px}
details{background:var(--paper);border:1px solid var(--line);border-radius:14px;padding:18px 22px}
details[open]{box-shadow:var(--shadow)}
summary{cursor:pointer;font-weight:700;font-size:17px}
summary::marker{color:var(--accent)}
details p{margin-top:10px}

/* iletişim */
.contact{display:flex;flex-wrap:wrap;gap:56px}
.contact > div{flex:1 1 360px;min-width:0;display:flex;flex-direction:column;gap:22px}
.contact > div .kicker{margin-bottom:0}
.contact dl{margin:0;display:flex;flex-direction:column;gap:18px;border-top:1px solid var(--night-line);padding-top:22px}
.contact dt{font-size:13px;font-weight:600;color:var(--on-dark-muted)}
.contact dd{margin:2px 0 0;font-size:20px;font-weight:700;color:#fff}
.contact dd a{color:#fff}
.contact dd a:hover{color:var(--accent-soft)}
.contact dd.addr{font-size:17px;font-weight:500;color:var(--on-dark)}
#teklif{flex:1.3 1 480px;min-width:0;background:var(--paper);color:var(--ink);border-radius:20px;box-shadow:0 24px 60px rgba(0,0,0,.35);padding:34px;display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:18px;align-content:start}
#teklif p{color:inherit}
/* uzun seçenekli bir açılır liste sütunu genişletip sayfayı taşırmasın */
#teklif > label{min-width:0}
#teklif input,#teklif select,#teklif textarea{width:100%;min-width:0;max-width:100%}
/* telefon klavyesi açılınca iOS sayfayı yakınlaştırmasın */
#teklif input,#teklif select,#teklif textarea{font-size:16px}
#teklif input:focus,#teklif select:focus,#teklif textarea:focus{outline:2px solid var(--accent);outline-offset:1px}

/* alt bilgi */
footer{background:#070C16;font-size:14px;color:var(--on-dark-muted);border-top:1px solid var(--night-line)}
footer .wrap{display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:16px;padding-top:28px;padding-bottom:28px}
footer .brand img{height:30px}
footer a,footer .brand b{color:#fff}
footer .brand small{color:var(--on-dark-muted)}

/* alt sayfalar */
.page-hero{border-bottom:1px solid var(--night-line)}
.page-hero .wrap{padding-top:72px;padding-bottom:72px;display:flex;flex-direction:column;gap:20px}
.page-hero .wrap > div{display:flex;flex-direction:column;gap:20px}
.page-hero .kicker{margin-bottom:0}
.page-hero h1{font-size:clamp(32px,4.2vw,52px);max-width:920px}
.crumbs{font-size:14px;font-weight:600;color:var(--on-dark-muted)}
.crumbs a{color:var(--on-dark-muted)}
.crumbs a:hover{color:#fff}
.toc{display:flex;flex-wrap:wrap;gap:8px 10px;margin:4px 0 0;padding:0;list-style:none}
.toc a{display:inline-flex;align-items:center;min-height:40px;padding:0 16px;border:1px solid var(--night-line-2);border-radius:999px;font-size:14px;font-weight:600;color:var(--on-dark)}
.toc a:hover{background:var(--accent);border-color:var(--accent);color:var(--on-accent)}
.prose{max-width:780px;display:flex;flex-direction:column;gap:18px}
.prose h3{margin-top:10px}
.stages{margin:0;padding:0;list-style:none;counter-reset:stage;display:flex;flex-direction:column;gap:16px}
.stages > li{counter-increment:stage;display:grid;grid-template-columns:56px minmax(0,1fr);gap:8px 24px;padding:28px;background:var(--paper);border:1px solid var(--line);border-radius:var(--radius)}
.stages > li::before{content:counter(stage);display:inline-flex;align-items:center;justify-content:center;width:44px;height:44px;border-radius:12px;background:var(--night);color:var(--accent-soft);font-weight:800;font-size:18px}
.stages > li > div{display:flex;flex-direction:column;gap:12px;max-width:840px}
.table-wrap{overflow-x:auto;border:1px solid var(--line);border-radius:12px;background:var(--paper)}
table{border-collapse:collapse;width:100%;font-size:15px}
th,td{text-align:left;padding:12px 16px;border-bottom:1px solid var(--line);vertical-align:top}
th{background:var(--stone);font-weight:700;color:var(--ink)}
tr:last-child td{border-bottom:0}
td{color:var(--body)}
.pills{display:flex;flex-wrap:wrap;gap:8px;margin:0;padding:0;list-style:none}
.pills li{border:1px solid var(--line);background:var(--stone);border-radius:999px;padding:6px 14px;font-size:14px;color:var(--body)}
.pills b{color:var(--accent-text)}
.methods{display:grid;grid-template-columns:repeat(auto-fit,minmax(300px,1fr));gap:24px}
.method{padding:26px 24px;gap:10px}
.method .card-img{width:calc(100% + 48px);margin:-26px -24px 8px}
.method dl{margin:6px 0 0;padding-top:12px;border-top:1px solid var(--line);display:flex;flex-direction:column;gap:8px;font-size:15px}
.method dt{font-weight:700;color:var(--ink)}
.method dd{margin:0;color:var(--body)}
.group-title{font-size:20px;margin:44px 0 18px}
.group-title:first-of-type{margin-top:0}
.note{border-left:3px solid var(--accent);background:var(--accent-tint);padding:16px 20px;font-size:15px;color:var(--body)}
.regs{margin:0;padding:0;list-style:none;display:flex;flex-direction:column;gap:12px}
.regs li{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1.4fr);gap:6px 32px;padding:20px 24px;background:var(--paper);border:1px solid var(--line);border-radius:14px}
.regs b{font-weight:700;font-size:17px;color:var(--ink)}
.regs span{color:var(--body);font-size:15px}
.figure{margin:0;border:1px solid var(--line);border-radius:14px;overflow:hidden;background:var(--paper)}
.figure img{width:100%;height:auto}
.figure figcaption{padding:10px 14px;border-top:1px solid var(--line);font-size:13px;color:var(--muted)}
.two-figs{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:20px;margin-top:8px}
.stage-fig{max-width:520px}

/* telefon ve küçük tablet: açılır menü */
@media (max-width:820px){
  section[id]{scroll-margin-top:80px}
  .bar{flex-wrap:nowrap;padding-top:14px;padding-bottom:14px}
  .brand img{height:40px}
  .brand small{display:none}
  header .brand b{white-space:nowrap}
  header .brand{gap:10px;min-width:0}
  .mobile-only{display:inline-flex}
  .bar-actions{display:flex;align-items:center;gap:8px}
  nav{display:none;position:absolute;left:0;right:0;top:100%;background:var(--night);border-bottom:1px solid var(--night-line);box-shadow:0 16px 32px rgba(0,0,0,.35);flex-direction:column;align-items:stretch;gap:0;padding:8px 24px 20px}
  header.open nav{display:flex}
  nav a{display:flex;align-items:center;min-height:52px;border-bottom:1px solid var(--night-line);font-size:17px}
  nav a.lang{border-radius:0;border:0;border-bottom:1px solid var(--night-line);padding:0;min-height:52px;font-size:17px}
  nav .btn{margin-top:16px;min-height:52px;font-size:17px;border-bottom:0;justify-content:center;color:var(--on-accent)}
}
@media (max-width:640px){
  body{font-size:16px}
  .wrap{padding:0 18px}
  .bar{padding-top:14px;padding-bottom:14px}
  header .brand b{font-size:16px}
  .section{padding:64px 0}
  .hero{padding-top:40px;padding-bottom:60px;gap:36px}
  .hero > div{gap:18px}
  .hero figure{padding:14px}
  .lead{font-size:17px}
  .actions{flex-direction:column}
  .actions .btn{width:100%;min-height:54px}
  .codes .wrap{flex-direction:column;align-items:flex-start;gap:4px}
  .head{margin-bottom:32px}
  .services{grid-template-columns:1fr;gap:16px}
  .service{padding:24px 20px}
  .card-img{width:calc(100% + 40px);margin:-24px -20px 6px}
  .split{gap:32px}
  .who{grid-template-columns:1fr 1fr;gap:10px}
  .who li{padding:16px 14px 16px 34px;font-size:15px}
  .who li::before{left:14px;top:23px;width:8px;height:8px}
  .steps{gap:12px}
  .projects{grid-template-columns:1fr;gap:32px}
  .about{gap:32px}
  .about .ph{max-width:none;aspect-ratio:4/3}
  .facts{grid-template-columns:repeat(3,minmax(0,1fr));gap:8px}
  .facts > div{padding:12px;display:flex;flex-direction:column;justify-content:space-between}
  .facts dt{font-size:12px;line-height:1.3}
  .facts dd{font-size:18px}
  .faq{gap:24px}
  details{padding:14px 16px}
  summary{font-size:16px}
  .contact{gap:36px}
  .contact dd{font-size:19px}
  .contact dd a{display:inline-flex;min-height:44px;align-items:center}
  #teklif{grid-template-columns:1fr;padding:20px;border-radius:16px}
  footer .wrap{flex-direction:column;align-items:flex-start}
  footer .brand b{font-size:15px}
  .page-hero .wrap{padding-top:40px;padding-bottom:44px}
  .stages > li{grid-template-columns:1fr;padding:20px}
  .stages > li::before{width:38px;height:38px;font-size:16px}
  .methods{grid-template-columns:1fr;gap:16px}
  .method{padding:22px 18px}
  .method .card-img{width:calc(100% + 36px);margin:-22px -18px 6px}
  .regs li{grid-template-columns:1fr;padding:16px 18px}
  th,td{padding:10px 12px;font-size:14px}
  .two-figs{grid-template-columns:1fr}
}
@media (prefers-reduced-motion:reduce){*{transition:none !important}html{scroll-behavior:auto}}