:root {
    --primary-color: #2563eb;
    --text-color: #1f2937;
    --bg-color: #ffffff;
    --light-bg: #f9fafb;
    --accent-color: #64748b;
}

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

body {
    font-family: 'Inter', sans-serif;
    color: var(--text-color);
    background-color: var(--bg-color);
    line-height: 1.6;
    scroll-behavior: smooth;
}

.container {
    max-width: 1100px;
    margin: 0 auto;
    padding: 0 2rem;
}

/* Navigasyon */
nav {
    background: rgba(255, 255, 255, 0.95);
    padding: 1.5rem 0;
    position: sticky;
    top: 0;
    z-index: 1000;
    border-bottom: 1px solid #eee;
}

.nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-weight: 600;
    font-size: 1.5rem;
    letter-spacing: 1px;
}

    .logo span {
        color: var(--primary-color);
    }

.nav-links {
    list-style: none;
    display: flex;
}

    .nav-links li {
        margin-left: 2rem;
    }

    .nav-links a {
        text-decoration: none;
        color: var(--text-color);
        font-weight: 400;
        transition: color 0.3s;
    }

        .nav-links a:hover {
            color: var(--primary-color);
        }

/* Hero Section */
.hero {
    padding: 100px 0;
    text-align: center;
    background: linear-gradient(to bottom, #f0f7ff, #ffffff);
}

    .hero h1 {
        font-size: 3rem;
        margin-bottom: 1rem;
        font-weight: 600;
    }

    .hero p {
        font-size: 1.25rem;
        color: var(--accent-color);
        margin-bottom: 2rem;
    }

.btn {
    background: var(--primary-color);
    color: white;
    padding: 0.8rem 2rem;
    border-radius: 5px;
    text-decoration: none;
    display: inline-block;
    transition: opacity 0.3s;
    border: none;
    cursor: pointer;
}

    .btn:hover {
        opacity: 0.9;
    }

/* Sections */
.section-title {
    text-align: center;
    margin: 4rem 0 3rem;
    font-size: 2rem;
}

.grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
    margin-bottom: 4rem;
}

.card {
    padding: 2rem;
    background: white;
    border: 1px solid #f0f0f0;
    border-radius: 10px;
    text-align: center;
    transition: transform 0.3s;
}

    .card:hover {
        transform: translateY(-5px);
        box-shadow: 0 10px 20px rgba(0,0,0,0.05);
    }

    .card i {
        color: var(--primary-color);
        margin-bottom: 1rem;
    }

.bg-light {
    background-color: var(--light-bg);
    padding: 4rem 0;
}

.ref-logos {
    display: flex;
    justify-content: space-around;
    flex-wrap: wrap;
    opacity: 0.6;
}

.ref-item {
    font-weight: 600;
    font-size: 1.2rem;
    margin: 1rem;
}

/* İletişim */
.contact-wrapper {
    max-width: 600px;
    margin: 0 auto 4rem;
}

#contact-form input, #contact-form textarea {
    width: 100%;
    padding: 1rem;
    margin-bottom: 1rem;
    border: 1px solid #ddd;
    border-radius: 5px;
    font-family: inherit;
}

footer {
    padding: 2rem 0;
    text-align: center;
    border-top: 1px solid #eee;
    color: var(--accent-color);
    font-size: 0.9rem;
}

@media (max-width: 768px) {
    .nav-links {
        display: none;
    }

    .hero h1 {
        font-size: 2rem;
    }
}
/* Mevcut CSS'e ek olarak şunları güncelle/ekle: */

.logo img {
    display: block;
    max-width: 150px; /* Logo boyutunu buradan ayarla */
}

.ref-logos {
    display: flex;
    justify-content: center;
    align-items: center;
    gap: 3rem;
    flex-wrap: wrap;
    filter: grayscale(100%); /* Logoları gri yapar, üzerine gelince renklenir */
    transition: 0.3s;
}

    .ref-logos img:hover {
        filter: grayscale(0%);
    }

    .ref-logos img {
        max-height: 50px;
        width: auto;
    }

/* Proje Kartları Tasarımı */
.project-card {
    background: white;
    border-radius: 12px;
    overflow: hidden;
    border: 1px solid #eee;
    transition: 0.3s ease;
}

    .project-card:hover {
        box-shadow: 0 15px 30px rgba(0,0,0,0.1);
    }

    .project-card img {
        width: 100%;
        height: 200px;
        object-fit: cover; /* Görseli bozmadan doldurur */
    }

.project-info {
    padding: 1.5rem;
}

    .project-info h3 {
        margin-bottom: 0.5rem;
        color: var(--primary-color);
    }

.nav-links a.active {
    color: var(--primary-color);
    font-weight: 600;
}