:root{
  /* Marka renklerini siteye göre hızlıca özelleştir */
  --bg:#0f172a;        /* arka plan */
  --fg:#e5e7eb;        /* ana yazı */
  --muted:#94a3b8;     /* ikincil yazı */
  --brand:#22d3ee;     /* vurgu-1 */
  --accent:#38bdf8;    /* vurgu-2 */
  --card:#111827;      /* kart zemini */
  --ring:#7dd3fc;      /* odak halkası */
  --max:1080px;        /* içerik genişliği */
}

*{box-sizing:border-box}
html,body{
  margin:0;
  background:linear-gradient(180deg,#0b1220,var(--bg) 40%,#0b1220);
  color:var(--fg);
  font:16px/1.6 system-ui,Segoe UI,Roboto,Helvetica,Arial,sans-serif;
}
a{color:var(--accent);text-decoration:none}
a:hover{text-decoration:underline}
img{max-width:100%;height:auto}

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

/* Header & Nav */
header{
  position:sticky;top:0;z-index:50;
  backdrop-filter:blur(12px);
  background:rgba(15,23,42,.6);
  border-bottom:1px solid rgba(148,163,184,.15)
}
.nav{display:flex;align-items:center;justify-content:space-between;padding:12px 0}
.brand{display:flex;gap:10px;align-items:center}
.logo{
  width:36px;height:36px;border-radius:10px;
  background:radial-gradient(circle at 30% 30%, var(--brand), transparent 60%), #0ea5e9;
  box-shadow:0 0 24px rgba(56,189,248,.35)
}
.brand h1{font-size:18px;margin:0}
.menu{display:flex;gap:14px;flex-wrap:wrap}

.btn{
  display:inline-block;padding:10px 16px;border-radius:12px;
  background:var(--accent);color:#0b1220;font-weight:600;
  border:1px solid rgba(255,255,255,.12)
}
.btn:hover{filter:brightness(1.1)}

/* Bölümler */
section{padding:48px 0;border-top:1px solid rgba(148,163,184,.12)}
.hero{padding:64px 0}
.hero h2{font-size:clamp(28px,5vw,44px);line-height:1.15;margin:8px 0 12px}
.hero p{color:var(--muted);max-width:720px}
.hero .cta{margin-top:20px;display:flex;gap:12px;flex-wrap:wrap}

.grid{display:grid;gap:16px}
@media(min-width:768px){.grid.cols-3{grid-template-columns:repeat(3,1fr)}}
@media(min-width:768px){.grid.cols-2{grid-template-columns:repeat(2,1fr)}}

.card{
  background:var(--card);
  border:1px solid rgba(148,163,184,.15);
  padding:18px;border-radius:16px
}

.kicker{
  color:var(--brand);font-weight:700;letter-spacing:.08em;
  text-transform:uppercase;font-size:12px
}
h3{margin:10px 0 6px}

.pill{
  display:inline-block;padding:6px 10px;border-radius:999px;
  border:1px solid rgba(148,163,184,.25);color:var(--muted);font-size:13px
}

/* İletişim alanı */
.contact{display:grid;gap:16px}
@media(min-width:768px){.contact{grid-template-columns:1.2fr .8fr}}
.note{color:var(--muted);font-size:14px}

/* Footer */
footer{
  padding:28px 0;border-top:1px solid rgba(148,163,184,.12);
  color:var(--muted)
}