/* GENEL AYARLAR */
        :root {
            --primary-red: #eb2525;
            --dark-text: #333;
            --light-bg: #f9f9f9;
        }

        /* HEADER (DİĞER SAYFALARLA AYNI) */
        header.page-header {
            position: relative;
            color: #fff;
            text-align: center;
            height: 350px;
            overflow: hidden;
            background: #222;
        }

        header.page-header img {
            width: 100%;
            height: 100%;
            object-fit: cover;
            opacity: 0.6;
            /* Yazı okunsun diye biraz kıstık */
        }

        header.page-header .header-content {
            position: absolute;
            top: 50%;
            left: 50%;
            transform: translate(-50%, -50%);
            width: 90%;
            max-width: 800px;
        }

        header.page-header h1 {
            font-size: 3rem;
            font-weight: 700;
            text-transform: uppercase;
            letter-spacing: 2px;
            text-shadow: 2px 2px 10px rgba(0, 0, 0, 0.5);
            margin: 0;
            border-bottom: 3px solid var(--primary-red);
            display: inline-block;
            padding-bottom: 10px;
        }

        /* REFERANS KARTLARI TASARIMI */
        .references-section {
            padding: 60px 0;
            background-color: #fff;
        }

        .ref-card {
            background: #fff;
            border: 1px solid #eee;
            border-radius: 8px;
            padding: 30px 20px;
            text-align: center;
            transition: all 0.3s ease;
            height: 100%;
            position: relative;
            overflow: hidden;
            box-shadow: 0 5px 15px rgba(0, 0, 0, 0.03);
        }

        /* Kartın üstüne gelince */
        .ref-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 15px 30px rgba(235, 37, 37, 0.1);
            border-color: var(--primary-red);
        }

        /* Kırmızı Çizgi Efekti */
        .ref-card::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 0%;
            height: 3px;
            background-color: var(--primary-red);
            transition: width 0.3s ease;
        }

        .ref-card:hover::after {
            width: 100%;
        }

        .ref-icon {
            font-size: 2.5rem;
            color: var(--primary-red);
            margin-bottom: 20px;
            display: inline-block;
        }

        .ref-title {
            font-size: 1.1rem;
            font-weight: 700;
            color: #444;
            margin: 0;
            text-transform: uppercase;
        }