html, body {
  margin: 0;
  padding: 0;
  height: 100%;
}

:root {
  --gold: #facc15;
  --gold-glow: rgba(250,204,21,.7);
  --dark: #020617;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  font-family: Arial, Helvetica, sans-serif;
  background: radial-gradient(circle at top, #111827, #020617 70%);
  color: #e5e7eb;
}

/* HEADER */
header {
  background: rgba(2,6,23,.85);
  backdrop-filter: blur(8px);
  padding: 16px 24px;
  position: sticky;
  top: 0;
  z-index: 20;
}

nav a {
  margin-right: 14px;
  font-weight: 700;
  color: #22c55e;
  text-decoration: none;
}

/* LAYOUT */
.container {
  max-width: 1100px;
  margin: auto;
  padding: 24px;
}

/* CARDS */
.cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(260px,1fr));
  gap: 20px;
  position: relative;
  z-index: 5;
}

.card {
  background: radial-gradient(circle at top, #0b1225, var(--dark));
  border-radius: 22px;
  padding: 28px;
  border: 1px solid rgba(255,255,255,.06);
  position: relative;
  overflow: hidden;
  z-index: 6;
  transition: transform .35s ease, box-shadow .35s ease;
}

.card:hover {
  transform: translateY(-10px) scale(1.03);
  box-shadow:
    0 25px 70px rgba(0,0,0,.8),
    0 0 50px rgba(250,204,21,.6);
}

/* ALTIN PATLAMA */
.card::after {
  content: "";
  position: absolute;
  inset: -40%;
  background: radial-gradient(circle, rgba(250,204,21,.55), transparent 60%);
  opacity: 0;
  transition: opacity .35s ease;
  pointer-events: none;
}

.card:hover::after {
  opacity: 1;
}

/* BUTTON */
.btn {
  display: inline-block;
  padding: 14px 22px;
  border-radius: 16px;
  background: linear-gradient(135deg, var(--gold), #fde047);
  color: #020617;
  font-weight: 900;
  text-decoration: none;
  margin-top: 10px;
  position: relative;
  z-index: 7;
  box-shadow: 0 0 15px var(--gold-glow);
  transition: all .25s ease;
}

.btn:hover {
  transform: scale(1.1) translateY(-3px);
  box-shadow: 0 0 45px rgba(250,204,21,.9);
}

/* FOOTER */
.footer {
  text-align: center;
  opacity: .6;
  padding: 24px;
}

/* PARTICLES / EFFECTS */
#particles,
.zeus-lightning {
  pointer-events: none;
  z-index: 0;
}
/* ANA SAYFA / GERİ DÖN BUTONU */
.home-btn {
  display: inline-block;
  margin-right: 18px;
  padding: 8px 14px;
  border-radius: 12px;
  font-weight: 800;
  color: #facc15;
  background: rgba(250,204,21,.12);
  border: 1px solid rgba(250,204,21,.4);
  box-shadow: 0 0 12px rgba(250,204,21,.35);
  transition: all .25s ease;
}

.home-btn:hover {
  background: rgba(250,204,21,.25);
  box-shadow: 0 0 28px rgba(250,204,21,.8);
  transform: translateY(-1px);
}