:root {
            --primary-color: #0f172a;
            --secondary-color: #ff0000;
            --accent-color: #10b981;
            --text-color: #334155;
            --light-bg: #f8fafc;
            --white: #ffffff;
        }
        
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
        }

        body {
            color: var(--text-color);
            background-color: var(--white);
            line-height: 1.6;
        }

        header {
            background-color: var(--primary-color);
            padding: 1rem 2rem;
            position: sticky;
            top: 0;
            z-index: 1000;
            box-shadow: 0 2px 10px rgba(0,0,0,0.1);
        }

        .nav-container {
            max-width: 1200px;
            margin: 0 auto;
            display: flex;
            justify-content: space-between;
            align-items: center;
        }

        .logo {
            color: var(--white);
            font-size: 1.5rem;
            font-weight: bold;
            letter-spacing: 1px;
        }

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

        nav ul {
            display: flex;
            list-style: none;
            gap: 2rem;
        }

        nav a {
            color: #94a3b8;
            text-decoration: none;
            font-weight: 500;
            transition: color 0.3s;
        }

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

        .hero {
            background: linear-gradient(135deg, #0f172a 0%, #1e3a8a 100%);
            color: var(--white);
            padding: 6rem 2rem;
            text-align: center;
        }

        .hero-content {
            max-width: 800px;
            margin: 0 auto;
        }

        .hero h1 {
            font-size: 3rem;
            margin-bottom: 1rem;
            letter-spacing: 1px;
        }

        .hero p {
            font-size: 1.25rem;
            color: #cbd5e1;
            margin-bottom: 2rem;
        }

        .container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 4rem 2rem;
        }

        .section-title {
            text-align: center;
            font-size: 2rem;
            color: var(--primary-color);
            margin-bottom: 3rem;
            position: relative;
        }

        .section-title::after {
            content: '';
            display: block;
            width: 50px;
            height: 4px;
            background-color: var(--secondary-color);
            margin: 10px auto 0;
            border-radius: 2px;
        }

        .grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 2.5rem;
            margin-bottom: 4rem;
        }

        .card {
            background: var(--light-bg);
            padding: 2.5rem;
            border-radius: 8px;
            box-shadow: 0 4px 6px -1px rgba(0,0,0,0.05);
            transition: transform 0.3s, box-shadow 0.3s;
            border-top: 4px solid transparent;
        }

        .card:hover {
            transform: translateY(-5px);
            box-shadow: 0 10px 15px -3px rgba(0,0,0,0.1);
        }

        .ins-card { border-top-color: var(--secondary-color); }
        .yaz-card { border-top-color: var(--accent-color); }
        .arge-card { border-top-color: #8b5cf6; }

        .card h3 {
            color: var(--primary-color);
            margin-bottom: 1rem;
            font-size: 1.4rem;
        }

        .card p {
            color: #475569;
            font-size: 1rem;
        }

        .felsefe-section {
            background-color: var(--light-bg);
            padding: 4rem 2rem;
            border-radius: 12px;
            margin-bottom: 4rem;
            text-align: center;
        }

        .felsefe-content {
            max-width: 800px;
            margin: 0 auto;
        }

        .felsefe-content h2 {
            margin-bottom: 1.5rem;
            color: var(--primary-color);
        }

        .felsefe-content p {
            font-style: italic;
            font-size: 1.1rem;
            color: #475569;
        }

        footer {
            background-color: var(--primary-color);
            color: #94a3b8;
            padding: 4rem 2rem;
        }

        .footer-grid {
            max-width: 1200px;
            margin: 0 auto;
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 2rem;
            border-bottom: 1px solid #334155;
            padding-bottom: 2rem;
            margin-bottom: 2rem;
        }

        .footer-col h4 {
            color: var(--white);
            margin-bottom: 1.2rem;
            font-size: 1.1rem;
        }

        .footer-col p, .footer-col a {
            color: #94a3b8;
            text-decoration: none;
            margin-bottom: 0.8rem;
            display: block;
        }

        .footer-col a:hover {
            color: var(--white);
        }

        .footer-bottom {
            max-width: 1200px;
            margin: 0 auto;
            text-align: center;
            font-size: 0.9rem;
        }

        @media (max-width: 768px) {
            .nav-container { flex-direction: column; gap: 1rem; }
            .hero h1 { font-size: 2.2rem; }
            .grid { grid-template-columns: 1fr; }
        }
    
/* --- Çok sayfalı yapı için eklenenler --- */
nav ul{flex-wrap:wrap;gap:1.2rem}
nav a.active{color:var(--white);border-bottom:2px solid var(--secondary-color);padding-bottom:4px}
.hero.small{padding:3.5rem 2rem}
.hero.small h1{font-size:2.2rem}
.hero-links{display:flex;flex-wrap:wrap;gap:10px;justify-content:center}
.seya-link{display:inline-block;padding:8px 14px;font-size:12px;font-weight:bold;color:#fff;background:#c62828;border-radius:8px;text-decoration:none;box-shadow:0 2px 6px rgba(0,0,0,.2);transition:background .2s,transform .2s}
.seya-link:hover{background:#e53935;transform:translateY(-2px)}
.more{display:inline-block;margin-top:1rem;color:var(--secondary-color);font-weight:600;text-decoration:none}
.more:hover{text-decoration:underline}
.linklist{list-style:none;display:grid;grid-template-columns:repeat(auto-fit,minmax(260px,1fr));gap:.6rem 2rem;margin-bottom:3rem}
.linklist a{color:var(--primary-color);text-decoration:none;border-bottom:1px dotted #94a3b8}
.linklist a:hover{color:var(--secondary-color)}
.share-buttons{display:flex;flex-wrap:wrap;gap:8px;margin-top:1rem}
.button{display:inline-block;padding:10px 16px;border:0;border-radius:6px;color:#fff;text-decoration:none;font-size:14px;cursor:pointer}
.twitter{background:#000}.facebook{background:#1877f2}.linkedin{background:#0a66c2}.whatsapp{background:#25d366}.telegram{background:#229ed9}.email,.copy{background:#666}
img{max-width:100%;height:auto}