:root{
  --bg:#0f172a;
  --bg2:#0b1220;
  --fg:#e5e7eb;
  --muted:#94a3b8;
  --brand:#22d3ee;
  --accent:#38bdf8;
  --card:#111827;
  --border:rgba(148,163,184,.15);
  --max:1080px;
}

*{
  margin:0;
  padding:0;
  box-sizing:border-box;
}

html,body{
  background:linear-gradient(180deg,var(--bg2),var(--bg) 40%,var(--bg2));
  color:var(--fg);
  font:16px/1.6 system-ui,Segoe UI,Roboto,Helvetica,Arial,sans-serif;
}

/* links */
a{
  color:var(--accent);
  text-decoration:none;
}
a:hover{
  text-decoration:underline;
}

/* container */
.container{
  max-width:var(--max);
  margin:0 auto;
  padding:0 16px;
}

/* header */
header{
  position:sticky;
  top:0;
  z-index:1000;
  background:rgba(15,23,42,.65);
  backdrop-filter:blur(12px);
  border-bottom:1px solid var(--border);
}
.nav{
  display:flex;
  align-items:center;
  justify-content:space-between;
  padding:14px 0;
}

/* brand */
.brand{
  display:flex;
  align-items:center;
  gap:12px;
}
.logo{
  width:36px;
  height:36px;
  border-radius:10px;
  background:radial-gradient(circle at 30% 30%, var(--brand), transparent 60%), #0ea5e9;
  box-shadow:0 0 18px rgba(56,189,248,.35);
}
.brand h1{
  font-size:20px;
  margin:0;
}
.pill{
  padding:3px 10px;
  border-radius:20px;
  font-size:12px;
  color:var(--muted);
  border:1px solid rgba(255,255,255,.15);
}

/* menu */
.menu{
  display:flex;
  gap:14px;
  flex-wrap:wrap;
  font-size:15px;
}

/* button */
.btn{
  padding:10px 16px;
  background:var(--accent);
  color:#0b1220!important;
  border-radius:12px;
  font-weight:600;
  border:1px solid rgba(255,255,255,.18);
}
.btn:hover{
  filter:brightness(1.12);
  text-decoration:none;
}

/* hero */
.hero{
  padding:70px 0;
}
.hero h2{
  font-size:clamp(26px,4.8vw,42px);
  line-height:1.15;
  margin:10px 0 14px;
}
.hero p{
  max-width:760px;
  color:var(--muted);
  margin-bottom:18px;
}
.hero .cta{
  display:flex;
  gap:12px;
  flex-wrap:wrap;
}

/* sections */
section{
  padding:50px 0;
  border-top:1px solid var(--border);
}

/* cards */
.card{
  background:var(--card);
  border:1px solid var(--border);
  padding:22px;
  border-radius:16px;
}
.card p{
  color:var(--muted);
}

/* grids */
.grid{
  display:grid;
  gap:20px;
}
@media(min-width:768px){
  .grid.cols-2{ grid-template-columns:repeat(2,1fr); }
  .grid.cols-3{ grid-template-columns:repeat(3,1fr); }
  .grid.cols-1{ grid-template-columns:1fr; }
}

/* kicker (bölüm üstü küçük başlık) */
.kicker{
  color:var(--brand);
  font-size:12px;
  font-weight:700;
  text-transform:uppercase;
  letter-spacing:.08em;
  margin-bottom:8px;
}

/* footer */
footer{
  text-align:center;
  padding:30px 0;
  border-top:1px solid var(--border);
  color:var(--muted);
}
footer a{
  color:var(--accent);
}

/* contact layout */
.contact{
  display:grid;
  gap:22px;
}
@media(min-width:768px){
  .contact{
    grid-template-columns:2fr 1fr;
  }
}

/* notes */
.note{
  color:var(--muted);
  font-size:14px;
  margin-top:8px;
}