/* Yalçınlar Limited - Basit, modern tasarım */
:root{
  --bg:#0b1220;
  --card:#0f172a;
  --accent:#38bdf8;
  --muted:#94a3b8;
  --text:#e5e7eb;
  --ok:#22c55e;
  --warn:#f59e0b;
  --err:#ef4444;
  --radius:16px;
  --shadow: 0 6px 24px rgba(0,0,0,.25);
}
*{box-sizing:border-box}
html,body{margin:0;padding:0;background:var(--bg);color:var(--text);font-family:system-ui,-apple-system,Segoe UI,Roboto,Arial}
a{color:var(--accent);text-decoration:none}
a:hover{text-decoration:underline}
.container{width:min(1100px, 92%); margin-inline:auto}
.nav{position:sticky;top:0;background:rgba(11,18,32,.85);backdrop-filter: blur(6px);z-index:50;border-bottom:1px solid #0b2a3b}
.nav .inner{display:flex;align-items:center;justify-content:space-between;padding:12px 0}
.logo{display:flex;align-items:center;gap:10px}
.logo img{height:34px}
.menu{display:flex;gap:16px;flex-wrap:wrap}
.menu a{padding:8px 12px;border-radius:10px}
.menu a.active, .menu a:hover{background:rgba(56,189,248,.12)}
.hero{border-radius:24px;overflow:hidden;box-shadow:var(--shadow);margin:18px 0}
.hero img{width:100%;display:block}
.section{margin:40px 0}
.grid{display:grid;gap:18px;grid-template-columns:repeat(12,1fr)}
.card{background:var(--card);border:1px solid rgba(56,189,248,.15);border-radius:var(--radius);padding:18px;box-shadow:var(--shadow)}
.card h3{margin:0 0 8px}
.kv{display:grid;grid-template-columns:100px 1fr;gap:10px;align-items:center}
.btn{display:inline-block;background:var(--accent);color:#042638;padding:10px 16px;border-radius:12px;font-weight:700;box-shadow:var(--shadow)}
.btn:hover{filter:brightness(1.05)}
.footer{margin:40px 0 20px;color:var(--muted)}
.tag{display:inline-block;padding:4px 10px;border:1px solid rgba(56,189,248,.35);border-radius:999px;color:var(--muted);font-size:12px}
.list{display:flex;flex-direction:column;gap:12px}
input, textarea{width:100%;padding:12px;border-radius:12px;border:1px solid rgba(56,189,248,.25);background:#0b1324;color:var(--text)}
label{font-size:14px;color:var(--muted)}
.form-row{display:grid;grid-template-columns:1fr 1fr;gap:12px}
.alert{padding:12px 16px;border-radius:12px;margin-bottom:12px}
.alert.ok{background:rgba(34,197,94,.1);border:1px solid rgba(34,197,94,.35)}
.alert.err{background:rgba(239,68,68,.1);border:1px solid rgba(239,68,68,.35)}
hr{border:0;border-top:1px solid rgba(56,189,248,.15);margin:24px 0}
/* Responsive */
@media(max-width:900px){ .grid{grid-template-columns:repeat(6,1fr)} .form-row{grid-template-columns:1fr} }
@media(max-width:560px){ .grid{grid-template-columns:repeat(4,1fr)} }