/* --- CLEAN CORPORATE DEĞİŞKENLER --- */
:root {
    --primary-color: #002b5c;   /* Kurumsal Lacivert */
    --secondary-color: #f4f6f8; /* Açık Gri Zemin */
    --accent-color: #c5a065;    /* Altın/Bronz (Vurgu) */
    --text-dark: #333333;       /* Ana Metin */
    --text-light: #ffffff;      /* Beyaz Metin */
    --border-color: #e0e0e0;
    --font-heading: 'Merriweather', serif; /* Güven veren Serif */
    --font-body: 'Open Sans', sans-serif;  /* Okunabilir Sans-Serif */
    --max-width: 1100px;
    --transition: all 0.3s ease;
}

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

body {
    background-color: var(--secondary-color);
    color: var(--text-dark);
    font-family: var(--font-body);
    line-height: 1.6;
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

/* Google Fonts */
@import url('https://fonts.googleapis.com/css2?family=Merriweather:wght@300;700&family=Open+Sans:wght@400;600&display=swap');

a { text-decoration: none; color: inherit; transition: var(--transition); }
ul { list-style: none; }
img { width: 100%; height: auto; display: block; }

/* --- HEADER --- */
header {
    background-color: var(--text-light);
    border-bottom: 1px solid var(--border-color);
    position: sticky;
    top: 0;
    z-index: 1000;
    box-shadow: 0 2px 10px rgba(0,0,0,0.05);
}

.nav-container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 20px;
    height: 80px;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.logo {
    font-family: var(--font-heading);
    font-size: 1.8rem;
    font-weight: 700;
    color: var(--primary-color);
    display: flex;
    align-items: center;
    gap: 10px;
    letter-spacing: -0.5px;
}

.nav-links { display: flex; gap: 30px; }

.nav-links a {
    font-weight: 600;
    color: #555;
    font-size: 0.95rem;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    padding: 10px 0;
    border-bottom: 2px solid transparent;
}

.nav-links a:hover, .nav-links a.active {
    color: var(--primary-color);
    border-bottom: 2px solid var(--accent-color);
}

.burger { display: none; cursor: pointer; color: var(--primary-color); font-size: 1.5rem; }

/* --- LAYOUTS --- */
.container {
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 60px 20px;
    flex: 1;
}

.grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 50px; align-items: center; }
.grid-3 { display: grid; grid-template-columns: repeat(auto-fit, minmax(300px, 1fr)); gap: 30px; }

/* --- COMPONENTS --- */
.btn {
    display: inline-block;
    padding: 14px 35px;
    background-color: var(--primary-color);
    color: var(--text-light);
    font-weight: 600;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    text-transform: uppercase;
    font-size: 0.9rem;
    letter-spacing: 1px;
}

.btn:hover {
    background-color: var(--accent-color);
    transform: translateY(-2px);
}

.corp-card {
    background: var(--text-light);
    padding: 40px;
    border: 1px solid var(--border-color);
    border-radius: 4px; /* Keskin ama hafif yumuşak */
    transition: var(--transition);
    border-top: 4px solid var(--primary-color);
}

.corp-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 30px rgba(0,0,0,0.08);
    border-top-color: var(--accent-color);
}

.icon-box svg { width: 45px; height: 45px; fill: var(--primary-color); margin-bottom: 20px; }

/* --- TYPOGRAPHY --- */
h1, h2, h3 {
    font-family: var(--font-heading);
    color: var(--primary-color);
    margin-bottom: 20px;
    line-height: 1.3;
}

h1 { font-size: 3rem; }
h2 { font-size: 2.2rem; text-align: center; position: relative; padding-bottom: 20px; }
h2::after {
    content: ''; position: absolute; bottom: 0; left: 50%; transform: translateX(-50%);
    width: 60px; height: 3px; background-color: var(--accent-color);
}

p { margin-bottom: 20px; color: #555; font-size: 1.05rem; }

/* --- HERO --- */
.hero {
    background-color: var(--primary-color);
    color: var(--text-light);
    padding: 100px 20px;
    text-align: center;
    background-image: linear-gradient(rgba(0, 43, 92, 0.9), rgba(0, 43, 92, 0.9)), url('https://images.pexels.com/photos/5668473/pexels-photo-5668473.jpeg?auto=compress&cs=tinysrgb&w=1260&h=750&dpr=1');
    background-size: cover;
    background-position: center;
}

.hero h1 { color: var(--text-light); }
.hero p { color: #e0e0e0; max-width: 700px; margin: 0 auto 30px auto; font-size: 1.2rem; }

/* --- FORMS --- */
.form-group { margin-bottom: 20px; }
label { display: block; margin-bottom: 8px; font-weight: 600; color: var(--primary-color); font-size: 0.9rem; }
input, textarea, select {
    width: 100%;
    padding: 12px;
    border: 1px solid #ccc;
    border-radius: 4px;
    font-family: inherit;
    font-size: 1rem;
    background-color: #fff;
}
input:focus, textarea:focus { outline: none; border-color: var(--primary-color); }

/* --- FOOTER --- */
footer {
    background-color: var(--primary-color);
    color: #b0bec5;
    padding: 60px 0 20px;
    margin-top: auto;
    font-size: 0.9rem;
}

.footer-content {
    display: flex;
    justify-content: space-between;
    flex-wrap: wrap;
    gap: 40px;
    max-width: var(--max-width);
    margin: 0 auto;
    padding: 0 20px;
}

.footer-col h4 { color: var(--text-light); margin-bottom: 20px; font-family: var(--font-heading); font-size: 1.2rem; }
.footer-col a { display: block; margin-bottom: 10px; color: #b0bec5; }
.footer-col a:hover { color: var(--accent-color); }

.tr-phone {
    font-weight: 600;
    color: var(--text-light);
    display: flex;
    align-items: center;
    gap: 10px;
    font-size: 1.1rem;
}

/* --- RESPONSIVE --- */
@media (max-width: 768px) {
    .nav-links {
        display: none;
        position: absolute; top: 80px; left: 0; width: 100%;
        background-color: var(--text-light);
        flex-direction: column; padding: 20px; text-align: center;
        box-shadow: 0 5px 10px rgba(0,0,0,0.1);
        border-top: 1px solid var(--border-color);
    }
    .nav-links.active { display: flex; }
    .burger { display: block; }
    
    .grid-2 { grid-template-columns: 1fr; }
    h1 { font-size: 2.2rem; }
    .footer-content { flex-direction: column; text-align: center; }
    .tr-phone { justify-content: center; }
}