:root {
    --primary-bg: #111111; /* Koyu Arkaplan */
    --secondary-bg: #1B1B1B; /* Footer Arkaplanı */
    --accent-color: #00FFFF; /* Neon Mavi/Cyan Vurgu Rengi */
    --text-color-light: #F0F0F0; /* Açık Renk Metin */
    --text-color-subtle: #999999; /* Alt Metin Rengi */
}

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

body {
    font-family: 'Inter', sans-serif;
    color: var(--text-color-light);
    background-color: var(--primary-bg);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    overflow-x: hidden;
    /* Fütüristik Arkaplan Efekti: Hafif gradient ve ızgara */
    background: radial-gradient(circle at 50% 10%, rgba(0, 255, 255, 0.1) 0%, transparent 40%), var(--primary-bg);
}

/* Header (Sadece Dil Butonu) */
header {
    width: 90%;
    max-width: 1200px;
    padding: 20px 0;
    display: flex;
    justify-content: flex-end; /* Sağa hizala */
    align-items: center;
    position: absolute;
    top: 0;
    z-index: 10;
}

.lang-switcher button {
    background: none;
    border: 1px solid var(--text-color-subtle);
    border-radius: 4px;
    padding: 5px 10px;
    cursor: pointer;
    font-size: 0.9rem;
    font-weight: 500;
    color: var(--text-color-light);
    transition: all 0.3s ease;
}

.lang-switcher button:hover {
    color: var(--accent-color);
    border-color: var(--accent-color);
    box-shadow: 0 0 10px rgba(0, 255, 255, 0.5);
}

/* Hero Section */
.hero-section {
    text-align: center;
    padding: 80px 20px;
    max-width: 900px;
    width: 100%;
    flex-grow: 1; 
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
}

/* Ortalanmış Logo */
.centered-logo {
    font-weight: 700;
    font-size: 2rem;
    letter-spacing: 2px;
    color: var(--accent-color); /* Vurgu rengiyle ön plana çıkar */
    margin-bottom: 40px;
    /* Hafif bir neon parlaması */
    text-shadow: 0 0 5px rgba(0, 255, 255, 0.5), 0 0 10px rgba(0, 255, 255, 0.3);
}

h1 {
    font-size: clamp(3.5rem, 9vw, 7rem); /* Daha büyük başlık */
    font-weight: 900; /* Ekstra Kalın */
    letter-spacing: -3px;
    margin-bottom: 10px;
    color: var(--text-color-light);
    text-transform: uppercase;
}

.subtitle {
    font-size: clamp(1rem, 2.5vw, 1.6rem);
    font-weight: 300;
    color: var(--text-color-subtle);
    border-bottom: 1px solid var(--accent-color); /* Başlığın altına ince çizgi */
    padding-bottom: 5px;
}

/* Footer */
footer {
    width: 100%;
    padding: 20px 0;
    background-color: var(--secondary-bg); /* Koyu footer */
    text-align: center;
    border-top: 1px solid rgba(0, 255, 255, 0.1); /* Vurgu renginde ince ayırıcı */
}

.copyright-text {
    font-size: 0.85rem;
    color: var(--text-color-subtle);
}

/* Responsive Düzenlemeler */
@media (max-width: 768px) {
    header {
        padding: 15px 20px;
    }
    .centered-logo {
        font-size: 1.5rem;
        margin-bottom: 30px;
    }
    h1 {
        letter-spacing: -1px;
    }
}