/* style.css */
:root {
    --primary-blue: #0A1931; /* Kurumsal Lacivert */
    --primary-red: #D20A11;  /* Kurumsal Kırmızı */
    --metal-grey: #D1D5DB;   /* Logo 'i' noktası gri tonu */
    --bg-light: #F9FAFB;
    --text-dark: #1F2937;
}

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

header {
    background-color: #FFFFFF;
    border-bottom: 3px solid var(--metal-grey);
    padding: 10px 50px;
    display: flex;
    justify-content: space-between;
    align-items: center;
    position: sticky;
    top: 0;
    z-index: 1000;
}

.logo img {
    height: 70px;
    width: auto;
}

nav a {
    text-decoration: none;
    color: var(--primary-blue);
    margin-left: 25px;
    font-weight: 600;
    font-size: 15px;
    transition: 0.3s;
}

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

.hero {
    background: linear-gradient(rgba(10, 25, 49, 0.7), rgba(10, 25, 49, 0.7)), url('https://images.unsplash.com/photo-1504917595217-d4dc5ebe6122?auto=format&fit=crop&w=1920&q=80') center/cover;
    height: 400px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    align-items: center;
    color: white;
    text-align: center;
}

.hero h1 { font-size: 40px; margin: 0; text-transform: uppercase; }

section { padding: 60px 10%; }

.section-title {
    color: var(--primary-blue);
    font-size: 32px;
    border-left: 5px solid var(--primary-red);
    padding-left: 15px;
    margin-bottom: 30px;
}

.bg-grey { background-color: var(--metal-grey); color: var(--primary-blue); }

.grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: 20px;
}

.card {
    background: white;
    padding: 25px;
    border: 1px solid #ddd;
    border-bottom: 4px solid var(--primary-blue);
    transition: 0.3s;
}

.card:hover { transform: translateY(-5px); border-bottom-color: var(--primary-red); }

.timeline-item {
    padding: 20px;
    margin-bottom: 10px;
    border-left: 2px solid var(--primary-blue);
    background: var(--bg-light);
}

.timeline-year { font-weight: bold; color: var(--primary-red); font-size: 20px; }

footer {
    background-color: var(--primary-blue);
    color: white;
    padding: 40px 10%;
    display: grid;
    grid-template-columns: 1.5fr 1fr;
    gap: 50px;
}

footer h4 { color: var(--metal-grey); margin-bottom: 15px; }

.footer-bottom {
    background: #050d1a;
    text-align: center;
    padding: 15px;
    color: #999;
    font-size: 13px;
}