* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;  /* Kutu elemanlarını kolayca hesaplamak için kullandım yoksa boyutlarda sıkıntı yaşanabiliyor. */
}

/* --- CANVAS ARKAPLAN AYARI --- */
#starfield {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: -1; /* Bütün elementlerin arkasında kalması için */
}

html {
    scroll-behavior: smooth;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    line-height: 1.8; 
    color: #1e293b;   
    

    background: linear-gradient(-45deg, #ee7752, #e73c7e, #23a6d5, #23d5ab);
    background-size: 400% 400%;
    animation: gradientBG 15s ease infinite;
    
    background-attachment: fixed;
    min-height: 100vh;
}

/* ----------------- GENEL ŞABLON  İÇİN CSS KISMI ----------------- */

/* ANA İÇERİK */
main {
    padding-top: 120px; 
    min-height: 85vh;
    padding-left: 2rem;
    padding-right: 2rem;
    max-width: 1200px;
    margin: 0 auto;
}

/* ----------------- APP CONTAİNER  İÇİN CSS KISMI ----------------- */

#app-container {
    /* Glassmorphism (Buzlu Cam) Efekti */
    background: rgba(255, 255, 255, 0.75);
    -webkit-backdrop-filter: blur(20px);
    backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.6); 
    
    border-radius: 24px;
    padding: 4rem 3rem;
    box-shadow: 0 20px 50px rgba(0, 0, 0, 0.1); 
    margin-bottom: 3rem;
    animation: fadeInUp 0.8s cubic-bezier(0.2, 0.8, 0.2, 1); 
}


#app-container h1,
#app-container h2 {

    background: linear-gradient(135deg, #4f46e5 0%, #7c3aed 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    
    margin-bottom: 1.5rem;
    font-weight: 800;
    letter-spacing: -1px;
}

#app-container h1 {
    font-size: 3rem;
    margin-bottom: 2rem;
}

#app-container h2 {
    font-size: 2.2rem;
    margin-top: 3rem;
    position: relative;
    display: inline-block;
}

/* Sorunlu sonradan bak! */
#app-container h2::after {
    content: '';
    display: block;
    width: 100%;
    height: 4px;
    background: #6366f1;
    margin-top: 10px;
    border-radius: 2px;
}

#app-container p {
    color: #475569;
    line-height: 1.8;
    margin-bottom: 1.5rem;
    font-size: 1.1rem;
}


@keyframes gradientBG {
    0% { background-position: 0% 50%; }
    50% { background-position: 100% 50%; }
    100% { background-position: 0% 50%; }
}