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

body {
  font-family: 'Roboto', sans-serif;
  background: #f0f4f8;
  color: #333;
  line-height: 1.6;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* Container */
.container {
  width: 90%;
  max-width: 1100px;
  margin: 0 auto;
}

/* Header */
header {
  background-color: #004080;
  color: white;
  padding: 20px 0;
}

header h1 {
  font-size: 2.8rem;
  text-align: center;
}

header .subtitle {
  text-align: center;
  font-size: 1.2rem;
  font-weight: 400;
  margin-top: 5px;
  opacity: 0.8;
}

nav {
  margin-top: 15px;
  display: flex;
  justify-content: center;
  gap: 25px;
}

nav a {
  color: white;
  font-weight: 600;
  text-decoration: none;
  font-size: 1.1rem;
  padding: 5px 10px;
  border-radius: 4px;
  transition: background-color 0.3s ease;
}

nav a:hover, nav a.active {
  background-color: #0070ff;
}

/* Ana Bölüm */
main {
  flex-grow: 1;
  padding: 40px 0;
}

/* Hero Bölümü */
.hero {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 40px;
  margin-bottom: 60px;
}

.hero-text {
  flex: 1 1 400px;
}

.hero-text h2 {
  font-size: 2.5rem;
  margin-bottom: 20px;
  color: #004080;
}

.hero-text p {
  font-size: 1.1rem;
  margin-bottom: 25px;
  color: #555;
}

.btn {
  background-color: #004080;
  color: white;
  padding: 12px 25px;
  font-size: 1.1rem;
  border: none;
  border-radius: 6px;
  cursor: pointer;
  text-decoration: none;
  display: inline-block;
  transition: background-color 0.3s ease;
}

.btn:hover {
  background-color: #0070ff;
}

/* Atom Animasyonu */

.atom-animation {
  position: relative;
  width: 180px;
  height: 180px;
  margin: 0 auto;
}

/* Çekirdek */
.nucleus {
  width: 40px;
  height: 40px;
  background: #004080;
  border-radius: 50%;
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  box-shadow: 0 0 10px #0070ff88;
}

/* Elektronlar */
.electron {
  width: 15px;
  height: 15px;
  background: #0070ff;
  border-radius: 50%;
  position: absolute;
  top: 50%;
  left: 50%;
  transform-origin: -70px 0;
  animation-timing-function: linear;
  box-shadow: 0 0 6px #00aaffcc;
}

.electron1 {
  animation: spin 4s linear infinite;
  transform-origin: -70px 0;
}

.electron2 {
  animation: spin 6s linear infinite;
  transform-origin: -50px 0;
  animation-delay: 1.5s;
}

.electron3 {
  animation: spin 8s linear infinite;
  transform-origin: -90px 0;
  animation-delay: 0.7s;
}

@keyframes spin {
  from {
    transform: rotate(0deg) translateX(70px) rotate(0deg);
  }
  to {
    transform: rotate(360deg) translateX(70px) rotate(-360deg);
  }
}

/* Özellikler Bölümü */
.features {
  display: flex;
  justify-content: space-between;
  flex-wrap: wrap;
  gap: 30px;
  max-width: 1100px;
  margin: 0 auto;
}

.feature {
  background: white;
  flex: 1 1 300px;
  padding: 25px 20px;
  border-radius: 10px;
  box-shadow: 0 4px 14px rgb(0 0 0 / 0.1);
  text-align: center;
  transition: transform 0.3s ease;
}

.feature:hover {
  transform: translateY(-8px);
}

.feature h3 {
  font-size: 1.4rem;
  color: #004080;
  margin-bottom: 15px;
}

.feature p {
  font-size: 1rem;
  color: #444;
}

/* Footer */
footer {
  background-color: #002050;
  color: #ccc;
  text-align: center;
  padding: 15px 10px;
  font-size: 0.9rem;
}

footer a {
  color: #66aaff;
  text-decoration: none;
}

footer a:hover {
  text-decoration: underline;
}

/* Responsive */
@media (max-width: 768px) {
  .hero {
    flex-direction: column;
  }

  .features {
    flex-direction: column;
  }
}