body {
            margin: 0;
            padding: 0;
            font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
            background-color: #f5f7fa;
            color: #333;
            height: 100vh;
            display: flex;
            align-items: center;
            justify-content: center;
            background-image: linear-gradient(135deg, #f5f7fa 0%, #e4e7eb 100%);
        }

        /* Login box - Modernize edilmiş */
        .login-box {
            background-color: #fff;
            padding: 40px;
            border-radius: 16px;
            width: 100%;
            max-width: 420px;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.08);
            text-align: center;
            position: relative;
            overflow: hidden;
            transition: transform 0.3s ease, box-shadow 0.3s ease;
        }

        .login-box:hover {
            transform: translateY(-5px);
            box-shadow: 0 15px 35px rgba(0, 0, 0, 0.12);
        }

        /* Logo stilleri */
        .logo {
            width: 120px;
            margin-bottom: 30px;
            filter: grayscale(100%) brightness(0.2);
        }

        /* Başlık stilleri */
        h2 {
            margin-bottom: 25px;
            font-size: 26px;
            font-weight: 700;
            color: #1a1a1a;
            position: relative;
        }

        h2::after {
            content: '';
            position: absolute;
            bottom: -10px;
            left: 50%;
            transform: translateX(-50%);
            width: 60px;
            height: 3px;
            background: linear-gradient(to right, #3498db, #2c3e50);
            border-radius: 2px;
        }

        /* Form stilleri */
        .form-group {
            margin-bottom: 20px;
            text-align: left;
        }

        .form-label {
            display: block;
            margin-bottom: 8px;
            font-weight: 600;
            color: #2c3e50;
            font-size: 14px;
        }

        form input {
            width: 100%;
            padding: 14px 16px;
            border: 1px solid #e0e6ed;
            border-radius: 8px;
            background-color: #f8fafc;
            color: #2d3748;
            font-size: 16px;
            transition: all 0.3s ease;
            box-sizing: border-box;
        }

        form input:focus {
            border-color: #3498db;
            box-shadow: 0 0 0 3px rgba(52, 152, 219, 0.2);
            outline: none;
            background-color: #fff;
        }

        form input::placeholder {
            color: #a0aec0;
        }

        form button {
            background: linear-gradient(to right, #2c3e50, #4a6582);
            color: white;
            border: none;
            padding: 14px;
            border-radius: 8px;
            cursor: pointer;
            font-weight: 600;
            width: 100%;
            font-size: 16px;
            margin-top: 10px;
            transition: all 0.3s ease;
            box-shadow: 0 4px 6px rgba(44, 62, 80, 0.1);
        }

        form button:hover {
            background: linear-gradient(to right, #1e2a38, #3a506b);
            box-shadow: 0 6px 10px rgba(44, 62, 80, 0.15);
            transform: translateY(-2px);
        }

        /* Hata mesajı */
        .error {
            color: #e74c3c;
            margin-bottom: 15px;
            padding: 10px;
            background-color: #fef2f2;
            border-radius: 6px;
            border-left: 4px solid #e74c3c;
            text-align: left;
        }

        /* Linkler */
        p {
            color: #4a5568;
            margin-top: 25px;
            font-size: 15px;
        }

        p a {
            color: #3498db;
            text-decoration: none;
            font-weight: 600;
            position: relative;
        }

        p a::after {
            content: '';
            position: absolute;
            bottom: -2px;
            left: 0;
            width: 0;
            height: 2px;
            background-color: #3498db;
            transition: width 0.3s ease;
        }

        p a:hover::after {
            width: 100%;
        }

        /* Ekstra dekoratif öğeler */
        .decorative-circle {
            position: absolute;
            border-radius: 50%;
            background: linear-gradient(135deg, rgba(52, 152, 219, 0.1) 0%, rgba(44, 62, 80, 0.05) 100%);
            z-index: -1;
        }

        .circle-top {
            width: 120px;
            height: 120px;
            top: -60px;
            right: -60px;
        }

        .circle-bottom {
            width: 80px;
            height: 80px;
            bottom: -40px;
            left: -40px;
        }

        /* Responsive tasarım */
        @media (max-width: 480px) {
            .login-box {
                padding: 30px 20px;
                margin: 0 15px;
            }
            
            h2 {
                font-size: 22px;
            }
        }