:root {
    --ana-renk: #4e54c8;       
    --ikincil-renk: #8f94fb;   
    --koyu-renk: #1f1c2c;      
    --beyaz: #ffffff;
    --gri-arkaplan: #f8f9fa;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: var(--gri-arkaplan);
    color: #333;
    line-height: 1.6;
    margin: 0;
    padding: 0;
}

a {
    text-decoration: none;
    transition: color 0.3s ease;
}


.navbar {
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1); 
    padding-top: 10px;
    padding-bottom: 10px;
}

.nav-link {
    font-weight: 500;
    margin-left: 10px;
    transition: color 0.3s ease;
}

.nav-link:hover {
    color: var(--ikincil-renk) !important;
}

.nav-link.active {
    color: var(--ikincil-renk) !important;
    font-weight: bold;
    border-bottom: 2px solid var(--ikincil-renk);
}


aside {
    background-color: var(--beyaz);
    border-radius: 15px;
    box-shadow: 0 4px 10px rgba(0, 0, 0, 0.05);
    border: 1px solid #eee;
    height: fit-content; 
}

aside h5 {
    color: var(--ana-renk);
    font-weight: bold;
    border-bottom: 2px solid #eee;
    padding-bottom: 10px;
    margin-bottom: 15px;
}

.reklam-eleman {
    font-size: 0.9rem;
    color: #555;
    padding: 5px;
    transition: background 0.3s;
    border-radius: 5px;
}

.reklam-eleman:hover {
    background-color: #f0f0f5;
}


.card {
    border: none;
    border-radius: 15px;
    overflow: hidden;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
    background-color: var(--beyaz);
}

.card:hover {
    transform: translateY(-5px); 
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.15);
}


.card-gradient {
    background: linear-gradient(135deg, var(--koyu-renk), #928dab);
    color: var(--beyaz);
}

.card-gradient .card-title {
    color: var(--beyaz);
}

.card-gradient .card-text {
    color: #e0e0e0;
}


.btn-ozel {
    background-color: var(--ana-renk);
    color: var(--beyaz);
    border: none;
    border-radius: 50px;
    padding: 10px 25px;
    transition: all 0.3s ease;
}

.btn-ozel:hover {
    background-color: #3e37a5; 
    color: var(--beyaz);
    box-shadow: 0 4px 10px rgba(78, 84, 200, 0.4);
    transform: translateY(-2px);
}


footer {
    background-color: #212529; 
    color: #bbb;
    margin-top: 50px;
    border-top: 5px solid var(--ana-renk); 
}


@media (max-width: 768px) {
    
    h1 { font-size: 1.8rem; }
    h2 { font-size: 1.5rem; }
}