:root {
    --main-blue: #0056b3;
    --dark-blue: #001f3f;
}

* { box-sizing: border-box; }

body {
    font-family: 'Segoe UI', sans-serif;
    margin: 0;
    line-height: 1.6;
    scroll-behavior: smooth;
    overflow-x: hidden;
}

/* MENÜ DÜZENLEME: Masaüstünde Tam Ortalar */
header {
    background: white;
    padding: 20px 0;
    position: fixed;
    width: 100%;
    top: 0;
    z-index: 1000;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
    display: flex;
    justify-content: center; /* Yatayda ortalar */
}

nav {
    width: 100%;
    max-width: 1200px;
}

nav ul {
    display: flex;
    justify-content: center; /* Menü elemanlarını ortalar */
    list-style: none;
    margin: 0;
    padding: 0;
}

nav ul li {
    margin: 0 20px;
}

nav ul li a {
    text-decoration: none;
    color: var(--dark-blue);
    font-weight: 600;
    font-size: 1rem;
    transition: 0.3s;
}

nav ul li a:hover {
    color: var(--main-blue);
}

/* HERO ALANI */
.hero {
    height: 100vh;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    text-align: center;
    position: relative;
    padding-top: 80px; /* Header mesafesi */
}

.main-logo {
    max-width: 280px;
    height: auto;
    margin-bottom: 10px;
}

h1 { margin: 10px 0; color: #333; }

.btn {
    display: inline-block;
    background: var(--main-blue);
    color: white;
    padding: 12px 35px;
    border-radius: 30px;
    text-decoration: none;
    font-weight: bold;
    margin-top: 10px;
    z-index: 2; /* Butonun önde kalmasını sağlar */
}

/* OK SEMBOLÜ: Butonun Altına Binmemesi İçin Konumu Düzenlendi */
.scroll-indicator {
    position: absolute;
    bottom: 40px; /* Sayfanın en altına yakın */
    left: 50%;
    transform: translateX(-50%);
    font-size: 1.8rem;
    color: var(--main-blue);
    animation: bounce 2s infinite;
    cursor: pointer;
}

@keyframes bounce {
    0%, 20%, 50%, 80%, 100% {transform: translateX(-50%) translateY(0);}
    40% {transform: translateX(-50%) translateY(-10px);}
    60% {transform: translateX(-50%) translateY(-5px);}
}

/* MOBİL GÖRÜNÜM (Dokunulmadı, Sadece Uyum Korundu) */
@media (max-width: 600px) {
    nav ul li {
        margin: 0 10px;
    }
    nav ul li a {
        font-size: 0.85rem;
    }
    .main-logo {
        width: 200px;
    }
}

/* Diğer Bölümler */
.about, .contact { padding: 100px 20px; text-align: center; background: #fff; }
.features { display: flex; justify-content: center; gap: 40px; flex-wrap: wrap; margin-top: 30px; }
.contact-info p { font-size: 1.1rem; color: #555; }
footer { background: var(--dark-blue); color: white; text-align: center; padding: 20px; font-size: 0.9rem; }