:root {
    --primary-color: #546B41;      
    --secondary-color: #99AD7A;   
    --accent-color: #DCCCAC;       
    --light-color: #FFF8EC;        
    --dark-color: #2c3e50;
    --background-color: #ffffff;
    --text-color: #444444;
    --text-muted: #777777;
    --border-color: #e9ecef;
    --border-radius: 12px;
    --box-shadow: 0 8px 25px rgba(0,0,0,0.05);
    --hover-shadow: 0 15px 35px rgba(0,0,0,0.1);
    --animation-duration: 0.4s;
}

body {
    font-family: 'Poppins', sans-serif;
    margin: 0;
    background-color: var(--light-color);
    color: var(--text-color);
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
}

*, *::before, *::after { box-sizing: border-box; }
.container { max-width: 1200px; margin: 0 auto; padding: 20px; }
h1, h2, h3, h4, h5, h6 { color: var(--dark-color); margin-bottom: 1rem; font-weight: 700; }
a { color: var(--primary-color); text-decoration: none; transition: color var(--animation-duration) ease; }
a:hover { color: var(--secondary-color); }

header {
    background-color: var(--background-color);
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
    padding: 1rem 20px;
    position: sticky;
    top: 0;
    z-index: 1000;
}
.nav-container { display: flex; justify-content: space-between; align-items: center; max-width: 1200px; margin: 0 auto; }
.logo { font-size: 1.8rem; font-weight: 800; color: var(--primary-color); letter-spacing: -0.5px; }
.desktop-nav { display: flex; gap: 30px; align-items: center; }
.desktop-nav a { color: var(--text-color); font-weight: 500; position: relative; padding: 5px 0; }
.desktop-nav a::after {
    content: ''; position: absolute; bottom: -2px; left: 0; width: 0; height: 2px;
    background-color: var(--secondary-color); transition: width var(--animation-duration) ease;
}
.desktop-nav a:hover::after, .desktop-nav a.active::after { width: 100%; }
.desktop-nav .admin-link { background-color: var(--primary-color); color: white; padding: 6px 12px; border-radius: 6px; }

/* Hamburger Menü */
.hamburger-btn { display: none; background: none; border: none; font-size: 1.8rem; cursor: pointer; color: var(--primary-color); }
.mobile-nav {
    display: none;
    flex-direction: column;
    background-color: var(--background-color);
    position: fixed;
    top: 0;
    left: -100%; /* Başlangıçta ekranın dışında */
    width: 80%;
    max-width: 300px;
    height: 100%;
    z-index: 2000;
    padding: 60px 20px 20px;
    box-shadow: 5px 0 15px rgba(0,0,0,0.1);
    transition: left 0.4s ease;
}
.mobile-nav.open { left: 0; }
.mobile-nav a { padding: 15px; font-size: 1.2rem; color: var(--dark-color); border-bottom: 1px solid var(--border-color); }
.mobile-nav a:last-child { border-bottom: none; }
.mobile-nav .admin-link { color: var(--primary-color); font-weight: bold; }

.hero-section { text-align: center; padding: 100px 20px; background: linear-gradient(135deg, var(--primary-color), var(--secondary-color)); color: white; border-radius: var(--border-radius); margin-top: 30px; box-shadow: var(--box-shadow); }
.hero-section h1 { font-size: 3.5rem; color: white; }
.hero-section p { font-size: 1.2rem; color: rgba(255,255,255,0.9); max-width: 700px; margin: 0 auto 40px auto; }
.btn { display: inline-block; padding: 14px 35px; background-color: var(--accent-color); color: var(--primary-color); border: none; border-radius: 50px; font-size: 1.1rem; font-weight: 600; cursor: pointer; transition: all var(--animation-duration) ease; box-shadow: 0 4px 15px rgba(220,204,172,0.4); }
.btn:hover { background-color: white; transform: translateY(-3px); box-shadow: 0 8px 20px rgba(0,0,0,0.1); }

.section-padding { padding: 80px 0; }
.section-title { text-align: center; font-size: 2.5rem; color: var(--primary-color); margin-bottom: 50px; position: relative; }
.section-title::after { content: ''; position: absolute; bottom: -15px; left: 50%; transform: translateX(-50%); width: 60px; height: 4px; background-color: var(--accent-color); border-radius: 2px; }

/* ... Diğer tüm CSS kodlarınız (about-section, tech-container, team-grid vb.) burada kalacak ... */
/* ... Bu kodların mobil uyumlu olması için sadece aşağıdaki Media Query'leri ekliyoruz. ... */
/* ... Önceki mesajlarda verdiğim tüm CSS'ler bu dosyada olmalıdır. ... */
.about-section { display: flex; gap: 40px; align-items: center; margin-bottom: 60px; flex-wrap: wrap; }
.about-text { flex: 1; min-width: 300px; }
.about-text h3 { color: var(--secondary-color); font-size: 1.8rem; margin-bottom: 15px; }
.about-text p { color: var(--text-muted); font-size: 1.1rem; line-height: 1.8; }
.about-features { flex: 1; min-width: 300px; display: grid; gap: 20px; }
.feature-box { background: white; padding: 25px; border-radius: var(--border-radius); border-left: 5px solid var(--accent-color); box-shadow: var(--box-shadow); transition: transform 0.3s; }
.feature-box:hover { transform: translateX(10px); border-left-color: var(--primary-color); }
.feature-box h4 { color: var(--primary-color); margin-bottom: 10px; font-size: 1.2rem; }

.tech-container { text-align: center; }
.tech-grid { display: grid; grid-template-columns: 1fr; gap: 20px; margin-top: 50px; max-width: 800px; margin-left: auto; margin-right: auto; }
.tech-card { background-color: var(--background-color); border-radius: var(--border-radius); box-shadow: var(--box-shadow); transition: box-shadow var(--animation-duration) ease; }
.tech-card input[type="checkbox"] { display: none; }
.tech-card .tech-header { padding: 25px 30px; cursor: pointer; display: flex; justify-content: space-between; align-items: center; transition: background-color var(--animation-duration) ease; }
.tech-card .tech-header:hover { background-color: var(--light-color); }
.tech-card h4 { color: var(--primary-color); font-size: 1.4rem; margin: 0; }
.tech-card .tech-icon { font-size: 1.5rem; font-weight: bold; color: var(--secondary-color); transition: transform var(--animation-duration) ease; }
.tech-card .tech-description { max-height: 0; overflow: hidden; transition: max-height var(--animation-duration) ease-in-out, padding var(--animation-duration) ease-in-out; }
.tech-card .tech-description p { padding: 0 30px 25px 30px; margin: 0; font-size: 1rem; color: var(--text-muted); line-height: 1.8; border-top: 1px solid var(--border-color); padding-top: 25px; }
.tech-card input[type="checkbox"]:checked ~ .tech-description { max-height: 500px; }
.tech-card input[type="checkbox"]:checked ~ .tech-header .tech-icon { transform: rotate(45deg); color: var(--primary-dark); }

.team-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(250px, 1fr)); gap: 30px; justify-items: center; }
.team-card { background-color: white; border-radius: var(--border-radius); padding: 30px; width: 100%; max-width: 300px; text-align: center; box-shadow: var(--box-shadow); transition: transform 0.3s, box-shadow 0.3s; border-bottom: 5px solid transparent; }
.team-card:hover { transform: translateY(-10px); box-shadow: var(--hover-shadow); border-bottom-color: var(--secondary-color); }
.team-img-wrapper { width: 140px; height: 140px; margin: 0 auto 20px auto; border-radius: 50%; overflow: hidden; border: 4px solid var(--light-color); padding: 5px; background: var(--accent-color); }
.team-img-wrapper img { width: 100%; height: 100%; object-fit: cover; border-radius: 50%; }
.team-card h4 { color: var(--primary-color); margin-bottom: 5px; font-size: 1.3rem; }
.team-card span { color: var(--text-muted); font-weight: 500; font-size: 0.95rem; display: block; }

.referans-galeri { display: grid; grid-template-columns: repeat(auto-fill, minmax(320px, 1fr)); gap: 35px; }
.referans-card { background-color: white; border-radius: var(--border-radius); box-shadow: var(--box-shadow); overflow: hidden; transition: transform var(--animation-duration), box-shadow var(--animation-duration); display: flex; flex-direction: column; }
.referans-card:hover { transform: translateY(-10px); box-shadow: var(--hover-shadow); }
.referans-card .card-image-wrapper { height: 230px; overflow: hidden; position: relative; background: var(--light-color); }
.referans-card img { width: 100%; height: 100%; object-fit: cover; transition: transform 0.6s ease; }
.referans-card:hover img { transform: scale(1.1); }
.referans-card .card-content { padding: 30px; flex-grow: 1; display: flex; flex-direction: column; }
.referans-card .card-category { font-size: 0.8rem; text-transform: uppercase; letter-spacing: 1px; color: var(--secondary-color); font-weight: 700; margin-bottom: 10px; }
.referans-card h3 { margin-top: 0; margin-bottom: 15px; font-size: 1.4rem; color: var(--dark-color); }
.referans-card p { flex-grow: 1; color: var(--text-muted); margin-bottom: 25px; font-size: 0.95rem; }
.referans-card .card-link { display: inline-block; padding: 10px 20px; background-color: var(--primary-color); color: white; border-radius: 5px; align-self: flex-start; font-weight: 500; transition: background-color 0.3s; }
.referans-card .card-link:hover { background-color: var(--secondary-color); }

.filtre-bar { margin-bottom: 40px; text-align: center; }
.filtre-bar a { margin: 0 8px; padding: 8px 20px; color: var(--text-color); background: white; border-radius: 30px; font-weight: 500; box-shadow: 0 2px 10px rgba(0,0,0,0.05); }
.filtre-bar a.active, .filtre-bar a:hover { background-color: var(--primary-color); color: white; }

.form-container { max-width: 500px; margin: 60px auto; padding: 40px; background: white; border-radius: var(--border-radius); box-shadow: var(--box-shadow); }
.form-group { margin-bottom: 20px; }
.form-group label { display: block; margin-bottom: 8px; font-weight: 600; color: var(--dark-color); }
.form-group input, .form-group select, .form-group textarea { width: 100%; padding: 12px; border: 1px solid var(--border-color); border-radius: 6px; font-family: inherit; font-size: 1rem; transition: border-color 0.3s; }
.form-group input:focus, .form-group textarea:focus { border-color: var(--secondary-color); outline: none; }

.alert { padding: 15px; margin-bottom: 20px; border-radius: 6px; font-weight: 500; text-align: center; }
.alert-success { background-color: #d4edda; color: #155724; border: 1px solid #c3e6cb; }
.alert-danger { background-color: #f8d7da; color: #721c24; border: 1px solid #f5c6cb; }

footer { background-color: var(--primary-color); color: var(--light-color); text-align: center; padding: 30px 20px; margin-top: 60px; }

/* === MOBİL UYUMLULUK (Responsive) === */
@media (max-width: 992px) {
    .desktop-nav { display: none; }
    .hamburger-btn { display: block; }
    .mobile-nav { display: flex; }

    .hero-section h1 { font-size: 2.5rem; }
    .section-title { font-size: 2.2rem; }
    .about-section { flex-direction: column; }
    .referans-galeri { grid-template-columns: 1fr; }
    .team-grid { grid-template-columns: repeat(auto-fit, minmax(220px, 1fr)); }
}

@media (max-width: 576px) {
    .hero-section h1 { font-size: 1.8rem; }
    .hero-section p { font-size: 1rem; }
    .section-title { font-size: 1.8rem; }
    .tech-grid { grid-template-columns: 1fr; }
}