/* GSDI Mühendislik – kurumsal mavi/beyaz tema */
:root{
  --navy:#0b2545;
  --blue:#0b5cad;
  --blue-600:#0a4a8f;
  --sky:#2f8fe0;
  --ice:#eef5fc;
  --ice-2:#dfeaf7;
  --ink:#1b2a3b;
  --muted:#5b6b7e;
  --line:#dbe4ee;
  --white:#fff;
  --accent:#16a6b6;
  --radius:14px;
  --shadow:0 10px 30px rgba(11,37,69,.08);
  --max:1160px;
}
*{box-sizing:border-box}
html{scroll-behavior:smooth}
body{margin:0;font-family:"Segoe UI",Inter,system-ui,-apple-system,Roboto,Arial,sans-serif;color:var(--ink);background:#fff;line-height:1.65;font-size:16.5px}
img,svg{max-width:100%;display:block}
a{color:var(--blue);text-decoration:none}
a:hover{color:var(--blue-600)}
h1,h2,h3,h4{line-height:1.2;color:var(--navy);margin:0 0 .5em;letter-spacing:-.01em}
h1{font-size:clamp(2rem,4.4vw,3.2rem);font-weight:800}
h2{font-size:clamp(1.55rem,2.8vw,2.1rem);font-weight:750}
h3{font-size:1.2rem;font-weight:700}
p{margin:0 0 1em}
.container{width:min(100% - 40px,var(--max));margin-inline:auto}
.section{padding:84px 0}
.section.alt{background:var(--ice)}
.eyebrow{display:inline-block;font-size:.8rem;font-weight:700;letter-spacing:.14em;text-transform:uppercase;color:var(--blue);margin-bottom:12px}
.lead{font-size:1.14rem;color:var(--muted);max-width:720px}
.center{text-align:center}
.center .lead{margin-inline:auto}

/* Header */
.topbar{background:var(--navy);color:#cfe0f3;font-size:.85rem}
.topbar .container{display:flex;justify-content:space-between;gap:16px;padding:8px 0;flex-wrap:wrap}
.topbar a{color:#cfe0f3}
.topbar a:hover{color:#fff}
header.site{position:sticky;top:0;z-index:50;background:rgba(255,255,255,.96);backdrop-filter:blur(8px);border-bottom:1px solid var(--line)}
.nav{display:flex;align-items:center;justify-content:space-between;height:76px}
.brand{display:flex;align-items:center;gap:12px;color:var(--navy)}
.brand svg{width:44px;height:44px}
.brand .name{font-weight:800;font-size:1.25rem;letter-spacing:.02em;line-height:1}
.brand .name small{display:block;font-size:.66rem;font-weight:600;letter-spacing:.28em;color:var(--blue);margin-top:5px}
nav.main ul{display:flex;gap:6px;list-style:none;margin:0;padding:0;align-items:center}
nav.main a{display:block;padding:10px 14px;border-radius:8px;color:var(--ink);font-weight:600;font-size:.96rem}
nav.main a:hover,nav.main a.active{background:var(--ice);color:var(--blue)}
nav.main a.cta{background:var(--blue);color:#fff;margin-left:8px}
nav.main a.cta:hover{background:var(--blue-600)}
.burger{display:none;background:none;border:1px solid var(--line);border-radius:8px;width:44px;height:44px;cursor:pointer}
.burger span,.burger span::before,.burger span::after{display:block;width:20px;height:2px;background:var(--navy);margin:auto;position:relative;content:""}
.burger span::before{position:absolute;top:-6px;left:0}
.burger span::after{position:absolute;top:6px;left:0}

/* Buttons */
.btn{display:inline-flex;align-items:center;gap:8px;padding:14px 26px;border-radius:10px;font-weight:700;border:2px solid transparent;cursor:pointer;font-size:1rem;font-family:inherit;transition:.2s}
.btn-primary{background:var(--blue);color:#fff}
.btn-primary:hover{background:var(--blue-600);color:#fff;transform:translateY(-1px)}
.btn-ghost{border-color:rgba(255,255,255,.5);color:#fff}
.btn-ghost:hover{background:#fff;color:var(--navy)}
.btn-outline{border-color:var(--blue);color:var(--blue)}
.btn-outline:hover{background:var(--blue);color:#fff}

/* Hero */
.hero{background:linear-gradient(135deg,#0b2545 0%,#0b4a8a 60%,#1b78c8 100%);color:#fff;position:relative;overflow:hidden}
.hero::before{content:"";position:absolute;inset:0;background-image:radial-gradient(rgba(255,255,255,.07) 1px,transparent 1px);background-size:26px 26px}
.hero .container{display:grid;grid-template-columns:1.05fr .95fr;gap:40px;align-items:center;padding:84px 0;position:relative}
.hero h1{color:#fff}
.hero p{color:#d6e6f7;font-size:1.15rem;max-width:560px}
.hero .eyebrow{color:#8fd0ff}
.hero .actions{display:flex;gap:14px;flex-wrap:wrap;margin-top:28px}
.hero-art{background:rgba(255,255,255,.07);border:1px solid rgba(255,255,255,.18);border-radius:22px;padding:18px}
.page-hero{background:linear-gradient(135deg,#0b2545,#0b4a8a);color:#fff;padding:64px 0;position:relative;overflow:hidden}
.page-hero::before{content:"";position:absolute;inset:0;background-image:radial-gradient(rgba(255,255,255,.07) 1px,transparent 1px);background-size:26px 26px}
.page-hero .container{position:relative}
.page-hero h1{color:#fff;font-size:clamp(1.9rem,3.6vw,2.7rem)}
.page-hero p{color:#cfe0f3;max-width:680px;margin:0}
.crumbs{font-size:.88rem;color:#9fc0e3;margin-bottom:10px}
.crumbs a{color:#9fc0e3}

/* Trust strip */
.strip{background:#fff;border-bottom:1px solid var(--line)}
.strip .container{display:grid;grid-template-columns:repeat(4,1fr);gap:0}
.strip .item{padding:26px 22px;border-left:1px solid var(--line);display:flex;gap:14px;align-items:center}
.strip .item:first-child{border-left:0}
.strip svg{width:36px;height:36px;flex:none;color:var(--blue)}
.strip b{display:block;color:var(--navy);font-size:1rem;line-height:1.25}
.strip span{font-size:.88rem;color:var(--muted)}

/* Cards */
.grid{display:grid;gap:24px}
.g2{grid-template-columns:repeat(2,1fr)}
.g3{grid-template-columns:repeat(3,1fr)}
.g4{grid-template-columns:repeat(4,1fr)}
.card{background:#fff;border:1px solid var(--line);border-radius:var(--radius);padding:30px;box-shadow:var(--shadow);transition:.25s}
.card:hover{transform:translateY(-4px);box-shadow:0 16px 38px rgba(11,37,69,.14)}
.card .ico{width:54px;height:54px;border-radius:12px;background:var(--ice);display:grid;place-items:center;margin-bottom:18px;color:var(--blue)}
.card .ico svg{width:30px;height:30px}
.card p{color:var(--muted);margin-bottom:0}
.card ul{margin:14px 0 0;padding-left:0;list-style:none}
.card li{padding:5px 0 5px 26px;position:relative;color:var(--ink);font-size:.97rem}
.card li::before{content:"";position:absolute;left:0;top:13px;width:14px;height:8px;border-left:2.5px solid var(--accent);border-bottom:2.5px solid var(--accent);transform:rotate(-45deg) scale(.8);transform-origin:left top}
.section-head{margin-bottom:46px}

/* Split */
.split{display:grid;grid-template-columns:1fr 1fr;gap:56px;align-items:center}
.split .art{background:var(--ice);border-radius:22px;padding:22px;border:1px solid var(--ice-2)}
.split.rev .art{order:2}
.checks{list-style:none;margin:18px 0 0;padding:0}
.checks li{padding:7px 0 7px 32px;position:relative}
.checks li::before{content:"";position:absolute;left:0;top:11px;width:20px;height:20px;border-radius:50%;background:var(--ice-2)}
.checks li::after{content:"";position:absolute;left:6px;top:17px;width:8px;height:5px;border-left:2.5px solid var(--blue);border-bottom:2.5px solid var(--blue);transform:rotate(-45deg)}

/* Sector tiles */
.sector{border-radius:22px;overflow:hidden;background:#fff;border:1px solid var(--line);box-shadow:var(--shadow);display:flex;flex-direction:column}
.sector .pic{background:linear-gradient(135deg,var(--ice),var(--ice-2));padding:22px;border-bottom:1px solid var(--line)}
.sector .body{padding:28px 30px 32px}
.tags{display:flex;flex-wrap:wrap;gap:8px;margin:14px 0 0}
.tag{font-size:.8rem;font-weight:600;background:var(--ice);color:var(--blue-600);padding:5px 12px;border-radius:99px}

/* Process */
.steps{counter-reset:s;display:grid;grid-template-columns:repeat(5,1fr);gap:18px}
.step{position:relative;padding:24px 20px;background:#fff;border:1px solid var(--line);border-radius:var(--radius)}
.step::before{counter-increment:s;content:counter(s);display:grid;place-items:center;width:38px;height:38px;border-radius:50%;background:var(--blue);color:#fff;font-weight:800;margin-bottom:14px}
.step h3{font-size:1.02rem;margin-bottom:6px}
.step p{font-size:.92rem;color:var(--muted);margin:0}

/* CTA band */
.cta-band{background:linear-gradient(120deg,var(--blue-600),var(--sky));color:#fff;padding:60px 0}
.cta-band .container{display:flex;justify-content:space-between;align-items:center;gap:28px;flex-wrap:wrap}
.cta-band h2{color:#fff;margin:0 0 6px}
.cta-band p{margin:0;color:#e1eefb}
.cta-band .btn{background:#fff;color:var(--blue-600)}
.cta-band .btn:hover{background:var(--navy);color:#fff}

/* Discipline duo */
.duo .card{border-top:5px solid var(--blue)}
.duo .card:nth-child(2){border-top-color:var(--accent)}

/* Projects */
.project .pic{border-radius:10px;background:linear-gradient(135deg,var(--ice),var(--ice-2));padding:16px;margin-bottom:18px}
.project .meta{font-size:.8rem;font-weight:700;letter-spacing:.08em;text-transform:uppercase;color:var(--accent);margin-bottom:6px}
.note{background:#fff8e6;border:1px solid #f1dca0;color:#7a5b00;border-radius:10px;padding:14px 18px;font-size:.92rem;margin-top:34px}

/* Contact */
.contact-grid{display:grid;grid-template-columns:1.2fr .8fr;gap:36px}
form .row{display:grid;grid-template-columns:1fr 1fr;gap:16px}
label{display:block;font-weight:600;font-size:.9rem;margin:0 0 6px;color:var(--navy)}
input,select,textarea{width:100%;padding:13px 14px;border:1.5px solid var(--line);border-radius:10px;font:inherit;background:#fff;color:var(--ink);margin-bottom:16px}
input:focus,select:focus,textarea:focus{outline:none;border-color:var(--blue);box-shadow:0 0 0 3px rgba(11,92,173,.15)}
textarea{min-height:150px;resize:vertical}
.check{display:flex;gap:10px;align-items:flex-start;font-size:.88rem;color:var(--muted);margin-bottom:18px}
.check input{width:auto;margin:4px 0 0}
.info-list{list-style:none;margin:0;padding:0}
.info-list li{display:flex;gap:14px;padding:14px 0;border-bottom:1px solid var(--line)}
.info-list li:last-child{border-bottom:0}
.info-list svg{width:24px;height:24px;color:var(--blue);flex:none;margin-top:2px}
.info-list b{display:block;color:var(--navy)}
.map-box{margin-top:24px;border-radius:var(--radius);border:1px dashed #9db6d1;background:var(--ice);min-height:200px;display:grid;place-items:center;text-align:center;color:var(--muted);padding:20px}

/* Footer */
footer.site{background:var(--navy);color:#b9cde4;padding:64px 0 0}
footer .cols{display:grid;grid-template-columns:1.4fr 1fr 1fr 1.2fr;gap:36px;padding-bottom:44px}
footer h4{color:#fff;font-size:1rem;margin-bottom:14px}
footer a{color:#b9cde4}
footer a:hover{color:#fff}
footer ul{list-style:none;margin:0;padding:0}
footer li{padding:4px 0}
footer .brand{color:#fff;margin-bottom:14px}
footer .brand .name small{color:#8fd0ff}
footer .bottom{border-top:1px solid rgba(255,255,255,.12);padding:20px 0;font-size:.86rem;display:flex;justify-content:space-between;flex-wrap:wrap;gap:10px}

/* Reveal */
.reveal{opacity:0;transform:translateY(18px);transition:opacity .6s,transform .6s}
.reveal.in{opacity:1;transform:none}
@media (prefers-reduced-motion:reduce){.reveal{opacity:1;transform:none;transition:none}html{scroll-behavior:auto}}

/* Responsive */
@media (max-width:980px){
  .hero .container,.split,.contact-grid{grid-template-columns:1fr}
  .split.rev .art{order:0}
  .g3,.g4{grid-template-columns:repeat(2,1fr)}
  .steps{grid-template-columns:repeat(2,1fr)}
  .strip .container{grid-template-columns:repeat(2,1fr)}
  .strip .item:nth-child(3){border-left:0}
  footer .cols{grid-template-columns:1fr 1fr}
  .burger{display:block}
  nav.main{position:absolute;left:0;right:0;top:76px;background:#fff;border-bottom:1px solid var(--line);display:none}
  nav.main.open{display:block}
  nav.main ul{flex-direction:column;align-items:stretch;padding:12px 20px 20px}
  nav.main a.cta{margin:8px 0 0;text-align:center}
}
@media (max-width:640px){
  .section{padding:60px 0}
  .g2,.g3,.g4,.steps,form .row,footer .cols{grid-template-columns:1fr}
  .strip .container{grid-template-columns:1fr}
  .strip .item{border-left:0;border-top:1px solid var(--line)}
  .strip .item:first-child{border-top:0}
  .topbar .container{justify-content:center;text-align:center}
}

/* düzeltme: bilgi listesinde kart onay işareti çıkmasın */
.info-list li::before{content:none}